text:
\section{Hadronic Scattering in a Purely Left-Handed World}

Consider a world in which the weak interaction is described by a purely
left-chiral SU(2) theory, spontaneously broken in the usual way. To
one-loop order, there are then finite weak corrections to the
left-chiral quark-{\bf gluon} vertex function which do not exist for
the corresponding right-chiral vertex. These (finite after wavefunction
renormalization) vertex corrections have the structure of form-factors
and so imply that the left-chiral quark-gluon form-factor falls more
rapidly with increasing (spacelike) squared four-momentum of the gluon
than does the right-chiral one.

The right-chiral quark-gluon vertex is completely unaffected in this
regard because the right-chiral quarks do not couple at all to this
weak interaction.  The difference of these vertex strengths then
induces a parity violation when, say, a beam of right-chiral quarks
impinging on a target of left-chiral quark is compared with the same
beam impinging on a target of right-chiral quarks. The strong
interactions (gluon exchanges) are equal, in the two cases, as are the
weak interactions at tree level, but the latter differ at one-loop
because of the vertex correction to the left-chiral quark-gluon
coupling. Note that in this simplified model, there are no other
one-loop graphs (box or crossed-box), as in the actual case, again
because the right-chiral quarks do not participate at all in this weak
interaction.

Thus, the gluon-mediated scattering of left-chiral quarks on
right-chiral quarks falls off more rapidly with four-momentum transfer
than does the scattering of right-chiral quarks on right-chiral
quarks.  This parity-violating asymmetry (PVA) in quark-quark
scattering, defined here as the difference between the right-chiral on
right-chiral total cross-section and the left-chiral on right-chiral
one divided by their sum, develops and grows as larger and larger
four-momentum transfers contribute to the total cross-sections as the
phase space expands with increasing energy.  The statement holds for
`elastic' quark-quark scattering below the weak vector boson production
threshold.

Above that threshold, the opening channels restore total cross-section
strength and damp out the PVA because, even in this simplified model,
bremsstrahlung of weak-bosons will compensate for the form-factor
reduction of elastic quark-quark scattering. However, if the mass of
the weak vector boson is large, it should be feasible, in principle,
(unlike the corresponding electromagnetic case) to experimentally
separate out the (weak-)elastic events from all others.

The below threshold growth of the PVA can only be ameliorated by the
slow, logarithmic change with scale of the coupling constants, unless
there are new right-chiral weak interactions which appear at some
(higher) mass scale. These new interactions weaken the right-chiral
quark-gluon vertex in a corresponding fashion, stopping the growth in
the difference between the two cross-sections. As the average total
cross-section continues to grow, the fractional PVA decreases. Thus we
expect two possibilities for PVA measurements at medium and high
energies: Either the Standard Model is correct and the PVA increases
with energy,  becoming less difficult to measure; or the PVA decreases
and experiments can only put an upper bound on its value at higher
energies. In the latter case, however, we can infer an {\bf upper}
bound on the mass scale of the vector bosons for a new right-chiral
weak interaction. This is the no-lose `theorem' referred to in the
title.

Our explicit calculations~\cite{jerry} of the vertex function in the
pure SU(2)$_{L}$ case show decrements in the vertex strength of only a
tiny fraction of a percent of the dimensionless weak coupling constant
at four-momentum transfers of order 1~GeV, but this grows by more than
an order of magnitude by 10~GeV. It grows to 30\% by the TeV region.
Thus, the only practical questions are whether the PVA can be measured
at all at lower energies, and whether the theoretical calculation of
the effect in the Standard Model is consistent with those results. We
believe the answer is positive in both regards~\cite{dean}, but this
contention relies heavily on the results from an
experiment~\cite{lockyer} at ANL at 6 GeV/$c$ and a more recent
result~\cite{vince} from LAMPF at even lower energies.

\section{A Brief Digression on Low-Energy Measurements and Theories}

Several theoretical and experimental attempts have been made in the
past to measure and predict the PVA in nucleon-nucleon scattering, now
defined as the difference between the total cross-sections for positive
and negative helicity (right- and left-chiral) nucleons on unpolarized
targets divided by their sum.  Early low energy experiments were
performed at energies of 15 and 45 MeV, finding negative PVA's of order
$10^{-7}$, to no one's great surprise. The theoretical efforts~\cite{bunch}
naturally approach the problem from the point of view of
meson-exchange forces and do produce the correct sign and order of
magnitude. The main problem was to obtain independent estimates of the
parity-violating meson-nucleon vertex function strengths. Some are
available through current algebra and bounds may be obtained from
limits on parity-violating admixtures in nuclear states.  A brave
attempt was made to calculate these quantities using QCD~\cite{ddh}.
Very recently, low energy polarized neutron scattering at LAMPF has
provided a new way to extract this information at zero
energy~\cite{dave}. These experiments are especially interesting as
parity-violating effects above the 10\% level have been discovered,
compromising the old arguments that such effects must always be very
small.

However, a common feature of the calculations emerged as they were
extended to intermediate energies:  As more partial waves or channels
($\Delta$ intermediate states, and multiple meson exchanges for
example) are added, the PVA tends to become positive (the cross-over
energy has been the subject of experimental efforts at
TRIUMF~\cite{vanO}) and an envelope of the collection of curves
appears, which continues growing with energy even though each new
individual contribution eventually falls off. For recent sophisticated
efforts that include references to earlier work, see~\cite{silbar}. The
impetus for these extensions was the `high' energy result at ANL, which
seemed incomprehensibly large, at $2 \times 10^{-6}$, compared to the
model results, despite their clear inadequacy at such a relatively
large energy.

The envelope feature, however, was reminiscent to me of features I had
seen in other attempts to describe high energy phenomena in terms of
mesons and baryons, phenomena which were more readily explained (i.e.,
in terms of fewer independent amplitudes) by using quarks and gluons.
At the instigation of Darragh Nagle, I therefore set out  with Dean
Preston, to calculate the relevant components of the weak Hamiltonian
for quarks in detail, and to apply it to nucleon-nucleon
scattering~\cite{dean,me}.

\section{The QCD Calculation}

Returning now to the real world, we find many dilution factors for the
PVA signal: Due to confinement, one must use proton beams and nucleon
targets, not quarks, with the attendant averaging over different
chirality quark beams and targets. Of course, since the quarks are not
directly visible, for a differential cross-section, a high $Q^2$ jet
would have to be observed to ascertain that a large momentum transfer
did indeed occur in the scattering event. Box and crossed-box graphs
appear. The mixing of the U(1) factor with both chiralities of
couplings to include electromagnetism in the standard electroweak model
also produces some cancelling right-chiral interaction corrections.
However, it is at least very unlikely (and was indeed found not to be
the case in the restricted energy range calculations of Ref.~\cite{me})
for there to be a strong cancellation in both proton-proton and
proton-neutron scattering, (where the beam proton is polarized).

{}From a high energy, quark point of view, the strong amplitude, A, is
schematically
$$
A \sim \alpha_s/q^2 \; , \eqno (1)
$$
where $\alpha_s$ is the strong coupling, and $q^2$ is the four-momentum
transfer, and the weak parity-violating amplitude, B, is similarly
$$
B \sim G_F  \; . \eqno (2)
$$
Then, since $\alpha_s \sim 1$ and $< q^2> \sim$ 0.1 GeV$^2/c^2$,
$$
PVA \equiv \frac{\sigma_{+} - \sigma_{-}}{\sigma_{+} + \sigma_{-}}
$$
$$
\sim \frac{|A^*B|}{|A|^2}
$$
$$
\sim G_F<q^2>/\alpha_s
$$
$$
\sim 10^{-6} \; , \eqno (3)
$$
where $\sigma_{\pm}$ are the total cross sections for positive and
negative helicity nucleons on unpolarized targets. Note the general
feature that the PVA is given by the overlap of a strong and weak
amplitude, divided by the total strong interaction cross-section.

The result in Eqn.~(3) suggests the ANL result is of normal size.
However, when averaged over realistic quark distributions in nucleons
and when all the 2's and $\pi$'s are included, this result is reduced
by about one order of magnitude. More detailed calculations require
studying strong and weak amplitudes involving box and crossed-box
graphs of gluons and weak vector bosons as well as the vertex
corrections referred to in the Introduction. We have calculated all of
the terms in the non-strange part of the weak Hamiltonian,  to all
orders in perturbation theory using the leading logarithm approximation
of the renormalization group~\cite{dean}.

The result is essentially unchanged for quark-quark scattering, where
the two quarks involved come from the different nucleons. However,
there is another component present, namely when the two quarks involved
come from the same nucleon. At first sight, this appears to be a quark
level description of wavefunction mixing, as was studied in a Regge
model by Soffer and Preparata~\cite{prep}. It was immediately
recognised that their conclusions must be wrong~\cite{bruce}, however,
since they obtained the ANL size and sign for the PVA, but their effect
is the only one that survives to zero energy, thus contradicting the
experimental results at low energy (barring {\bf very} rapidly varying
amplitudes below 10 MeV).

There is a more subtle error in that approach also. It is due to the
fact that the quark-quark scattering in one nucleon can be influenced
by the proximity of the other nucleon in the overall process. To see
this, think of the quarks in a nucleon as wavepackets continually
rescattering on each other due to the attractive strong interaction. A
parity-violating wavefunction mixing occurs when the rescattering of
this pair of quarks (diquark) occurs due to the action of the weak
Hamiltonian rather than the strong. (Note that only the isospin-one,
spin-one, vector diquark can contribute.) However, if there is another
nucleon nearby, a non-negligible probability develops for one of its
quarks to scatter on one of the quarks in the diquark just before the
weak scattering occurs. (Or just after, but the other time-ordering is
intuitively easier to understand.) This injects a four-momentum which
raises the intermediate state diquark (before the weak scattering) to
larger mass scales.  As such, this effect includes all relevant
parity-violating mixing between the nucleon and {\bf higher} mass
baryonic states.  It is {\bf not} constrained by (low energy)
nuclear data on (diagonal) parity violating components of the nucleon
itself.  The probability of the weak scattering has not been otherwise
significantly affected because the `other' quark of the pair was
already `focused' to rescatter with this boosted quark, due to the
strong interactions that shaped their wavefunctions. In nuclear physics
terms, this is a combination of distorted wave (intial and final) and
three-body effects. Aside from the change in the flux relevant to the
scattering process, the rapid growth of the weak scattering strength
with energy means that the parity-violating state mixing can be
markedly increased.

Preston and I did find~\cite{me,us} a PVA growing with energy due to this
quark-diquark scattering effect. Moreover, for reasonable parameter
values, the size of the effect is consistent with the ANL result.
Normalizing to that result and correcting for growth in the strong
cross-section at lower energies, we also predicted~\cite{us} a value
consistent with the smaller, but still positive, PVA found at lower
energy in the LAMPF experiment~\cite{vince}. For completeness,
we should note that in both the quark-quark and the quark-diquark
scattering cases, a single term of the effective weak Hamiltonian
dominates, but its strong interaction enhanced strength is uncertain
by an estimated overall factor of four. This is why we view the energy
dependence of our result as more reliable than the absolute scale.

\section{Response to Criticism}

Simonius and Unger (SU) have taken exception~\cite{su} to our
calculation.  They argue that we must model both the strong and the
weak amplitude for the scattering processes, just as is done in the low
energy meson-baryon descriptions, in order to make a meaningful
prediction of the PVA. In a sense, we agree with them but argue that we
have done a much better job of this than they have.

We take QCD with conventional parameter values to represent the strong
interaction. For the weak interaction, our approximation requires using
a quark-diquark amplitude wherein the diquark undergoes a weak
scattering and one of the quarks in it exchanges a gluon with the
intruding quark. The leading term in the QCD amplitude which overlaps
this, in our approximation, involves a similar structure, with the
internal diquark weak scattering replaced by a gluon exchange to
represent the strong interaction. This last is required because our
diquark representation has been simplified to that of two quarks, each
carrying precisely half of the diquark momentum.  (The diquark momentum
fraction distribution is taken as the complement to the quark momentum
fraction distribution derived experimentally from deep inelastic lepton
scattering.) As a result, without this strong scattering of the two
quarks, there would be an unrealistically poor overlap with the final
state distribution of the two quarks from the weak scattering, which
spreads their strength widely over momentum space. In a sense, we are
modeling the quark wavefunction in the diquark by its perturbative
part. The actual amplitude is stronger, but falls off more rapidly with
momentum transfer until reaching the perturbative level so that, if
anything, we should have an underestimate of the overall size of the
effect.

In addition, however, we use another approximation involving SU(3)
group characters to reduce a twelve $\gamma$-matrix trace to a product
of two traces each involving six $\gamma$-matrices. As a result, only
one of several strong-weak overlap amplitudes survives the color and
Dirac tracings. SU calculate the corresponding strong-strong overlap,
still with only one term, and find a large and rapidly growing (with
energy) contribution to the total strong interaction cross-section.
{}From this their criticism devolves.

However, it is clear on several counts that the SU calculation is
meaningless.  Where we take the measured total cross section for the
strong interaction, SU take only one quark-diquark graph to represent
QCD.  It is straightforward to see that this is not consistent, as
there is no reason to assume that the other QCD graphs vanish.  In
fact, this graph represents neither a complete set nor even a gauge
invariant subset of graphs, and hence, the procedure is not sensible.
This is fortunate, since if their calculation were correct, they would
have shown that the quark-diquark contribution to nucleon-nucleon
scattering proves QCD is inconsistent with data!

That there is some difference is apparent from the fact that SU find
\underline{8 barns} for the nucleon-nucleon total cross section at a
total center-of-mass energy squared ($S$) of 13 GeV$^2$.   If their
calculation were valid, QCD itself would have proven false!  But the SU
calculation cannot be correct since it is well known that the
contribution of such graphs in a renormalizable theory to the total
cross-section cannot grow faster than $ln^{2}(S)$, and their
cross-section grows much faster.  In fact, our initial
results~\cite{me} grow only as $ln(S)$. Furthermore, we improved our
calculation~\cite{us} by including the logarithmic variation of the
strong coupling with momentum transfer scale (which, to carry out the
resulting integrations, required forcing an equality between the
renormalization scale and effective gluon mass, or infrared cutoff).
This causes the PVA to fall asymptotically as $ln(ln(S))/ln(S)$ despite
the nonrenormalizable weak vertex (which, by the way, limits the
applicability of our results to $\sqrt{S} \stackrel{<}{\sim}$ 1 TeV,
where the effect of the W-boson propagator should become apparent), and
so the SU result should fall even faster.  We re-emphasize that their
result does not fall, but rather increases rapidly with $S$.

We are unable to trace the source of the error, since they present only
numerical results.  Note, however, that their problem is reminiscent of
similar ones in QED where gauge invariance has not been properly
implemented.  There, as here, a single graph at a given order can be
larger than the sum, showing that there, as here, arbitrarily picking
out one graph is completely unjustified.  Our effectively single graph
result for the weak PVA numerator came from examining all graphs to
this order, and finding that, {\bf in that particular case}, the
rest were negligible, or vanished.  It is clear this would {\bf not} be
the case for the QCD denominator.

Finally, we note that SU implicitly propose summation of the large
coupling constant, divergent perturbation series for QCD. No such
calculation would be credible. Even the operator-product type of
analysis for summing leading logarithms to calculate strong interaction
enhancements to the weak amplitude is subject to serious criticism,
although its employment is standardly accepted. Rather, it is our
experience that the {\bf leading} term in a QCD calculation, with normal
parameter values, gives a good representation of the physics in any
given process, up to an overall strength factor. This is why we used
the experimental value for the total strong-interaction cross-section,
checking only that the {\bf leading} graphs for this are consistent the
experimental results for the (normally accepted) parameter values that
we used in the rest of the calculation of the PVA.

\section{A Proposal for an `Improved' Calculation}

Our calculation can, of course, be improved. We have recently realized
that, at the cost of going to a level of complexity involving traces of
products of eight $\gamma$-matrices, we can redo the quark-diquark
scattering calculation in a different way. It requires modeling the
diquark wavefunction, and we were initially reluctant to add such an
ans\"{a}tz. It will, however, allow us to calculate to one lower order
in the strong interaction, since we can now use this wavefunction to
provide for the overlap with the weak scattering amplitude.  Thus, the
strong interaction will appear only in the same order in the numerator
and (conceptually) in the denominator of our PVA estimate. As we just
argued in the previous section, a lower order calculation in QCD should
be more reliable (at least, in that regard). Furthermore, such a
calculation will provide a qualitative check on our result. From the
structure of the integrals, we can see no reason for a markedly
different result.

\section{Effect of the QCD Spin Crisis}

Our model is based on the heretofore conventional wisdom that all of
the nucleon spin is carried by the valence quarks~\cite{crisis}. If
the sea and gluons are highly polarized, then graphs for the weak
amplitude which we have ignored, such as polarized gluon-gluon
scattering,  could become important.  We would find this hard to credit
except for one consideration:  the two-phase vacuum model of
confinement involves chromo-electric and -magnetic fields.  These could
carry significant spin, polarizing the sea quarks to produce a precise
cancellation for an ``empty'' perturbative vacuum bubble.  Introduction
of polarized valence quarks would certainly disturb this cancellation,
and it is precisely at small Bjorken~$x$ where one would expect the
largest effect.  We speculate that this is related to high-p$_T$
polarization phenomena~\cite{hipt}, becoming significant  when the
p$_T$ is large enough that the hard scattering involved occurred in
{\bf one} polarization region.  However, this speculation and the
effect of these considerations on the PVA require considerable
additional effort before any conclusions can be drawn.  Conversely, the
measured high energy PVA may be an important constraint for
interpreting the results of such a theoretical study.

The situation may not be of too great concern, however, since our PVA
contibution comes dominantly from harder scattering of quarks at higher
Bjorken~$x$. As Kunz, Mulders and Pollock have shown~\cite{kmp}, the
valence quark spin distribution is not significantly different from
expectation. Indeed, they find that the entire measured result is not
unreasonable, since any low p$_T$ quark model will evolve spin from the
valence constituent quarks to the sea and gluons as Q$^2$ increases.
Therefore, we do not expect this interesting development to invalidate
our calculation or conclusions.

\section{Conclusion}

In summary, we have presented a simple model which, as for deep
inelastic structure functions or Drell-Yan lepton-pair production,
cannot supply an accurate prediction of the PVA at a given energy, but
which should be valid for the (strong) energy dependence of the PVA at
high energies.  Due to approximations made in evaluating it, the model
is not applicable above 1 TeV.  Amazingly, it is consistent with data
between 6 and 1.5 GeV/c, when the variation of the total
nucleon-nucleon cross section between those beam momenta is taken
crudely into account.

We predict that an experiment at Brookhaven should expect to find a PVA
$\sim$ 10$^{-5}$ and one at Fermilab, almost 10$^{-4}$.  Naturally, the
prudent experimenter will design for an order of magnitude better
sensitivity than these predictions, if possible. More importantly,
perhaps, we have shown that, if PVA's at these levels are not observed,
one may interpret such a result as evidence for the existence of new,
right-chiral weak interactions. Calculations are in progress to provide
a firm numerical link between the value of (or upper bound on) the PVA
at a given energy and the upper bound on the mass scale for the new
weak vector boson. A confirmation of the PVA at somewhat lower energies
is also needed.

\section{Acknowledgments}

The work reported here was done in collaboration with G.\  J.\
Stephenson, Jr.\ , Dean Preston and Kim Maltman. It was supported in
part by the US DOE.

redpajama_set_name: RedPajamaArXiv


Chapter One Section Nine: Succotash and diced carrots.
She turned to find a monk in brown robes addressing her. He had a pleasant and friendly voice, but she could not help staring at the scar on his cheek.
"I'm sorry," she said when she realized that she was staring at him. "You must be Duncan, uh, Brother Duncan?" She took the hand he extended to her and shook it.
"Yes, I am. You can call me Duncan or even Dunk, if you like, and you are Buffy." It was not a question though it did ask her permission to be on a first name basis.
"Spike has told us a lot about you over the years. I feel that I know you."
"I thought you were a priest," she asked hoping that was not too intrusive a question.
"When Spike and I first met, I was, technically I still am. I'm just not currently...serving in that capacity." He said leaving the subject open.
"I'd like to welcome you to our Mission, please feel at home. Father Sebastian, head of our Order, has asked me to extend his welcome as well. He regrets that his schedule today will not allow him to speak with you personally: he has asked me to schedule some time, tomorrow perhaps, to meet with you. He has some business he would like to discuss with you...Slayer business...nothing of an immediate or pressing nature, of course. Is it safe to assume you will be staying with us that long?"
"I, uh, don't really have a schedule to keep," she said, "...so yeah, I'm free and I guess I'll be staying here, if that's alright?"
"Yes, certainly." Duncan went on "...Father Sebastian has also asked me to see to your accommodations."
we can certainly make one available."
"No, that's okay,' she said then realized she was talking to a priest...monk? "Oh!" She added quickly, "...Is that okay?"
"Actually, according to staff rules," he paused to mentally review them, "...it should be fine, but officially," he added lightly touching the girdle of his robes "...no."
tone became noticeably lighter with his next words.
"No, it's just...the staff rooms are small and Spike can be..." he trailed off. "Don't get me wrong, I am his friend, but..."
"Good, well...from the friend, not the priest," Brother Duncan said confusingly.
"Father Sebastian doesn't really need to know," he said with an air of conspiracy, "...but, Buffy, if the accommodations do become a bit, um...you will let us know, myself or Father Francisco," he gestured to the priest now manning the main desk by way of introduction.
"I will, thank you," she said. "I was hoping to find Spike, to talk to him, but I can see he's busy." She could see him talking with someone in one of the cubicles that flanked the area behind the desk.
"No, no, not urgent," Buffy said. "I met Sister Kate in the shower earlier; she said you could use a hand in the kitchen?"
"Ah, yes...corn...yes, hands are welcome in all capacities here. I'll take you to her; perhaps give you a small tour of the Mission along the way."
"Thank you." She was going to ask about the 'corn' but figured it had something to do with the 'peas'...succotash?"
"I'd like that," she said.
"Did Spike tell you about the basement," he asked, as they started toward the kitchens.
Diced carrots, they were evil, and banana cream pudding, and many, many children, small children, pre-schoolers. By 1:30 in the afternoon the Slayer sat, defeated, in the middle of the pre-school lunchroom wiping pudding off her arms with a napkin. She needed another shower and they had pulled her hair completely out of the hair tie in directions she didn't know were possible and she was sure there was pudding in it and carrots down her top. Defeated, utterly.
Father Francisco rescued her from the cleanup.
as the other kitchen helpers called it.
"Just high school guidance type stuff. I'm not really qualified..." she answered still wiping the pudding and other foodstuffs off.
She shrugged and looked at the mess in the room around her.
His look conceded that it probably was not as bad as she thought it was. "School aged," he added," and you can use a computer, yes?"
Again, she shrugged and nodded. "A little, I guess."
"And you survived...this, so I think you can handle it. We are short handed up there. Do you think you could pitch in? It's just matching kids with the appropriate social services on the computer, and there is a good desk guide. It's mostly in the interviewing process. We could really use your help." His smile, let alone with the sparkle in his eyes, could convince her.
She had to admit he was very persuasive and sorta cute, for a priest. Buffy could not tell how old he was, he had that ageless look, and there was a look of mystery about him. She wondered, briefly, if he was a vampire or some other type of demon; but no, he was just charismatic. She thought maybe she could help out. It had to be better than this.
"I'll try," she said as she took the arm he offered to help her up off the floor.
"That's all we ask. Thank you. Uh, you might want to..." he pointed to her hair, "...carrot. The next appointment wave doesn't start until two, see Brother Duncan, he'll show you everything."
As he left her to straighten her ponytail and shake the carrots out of her hair and top, Cisco mentally flipped the switch that allowed him the sanity to function in the real world off briefly to allow the facts of his read of the Slayer in to his consciousness.
Spike isn't far off in his perceptions of her, is he? Cisco thought as he headed up the stairs to the offices, even if they are colored by his love, they are accurate. She'll do, he thought, she will do.
It was exactly as they were hoping,yet that only made him feel more uneasy.
This is the new site!
It's best read starting with the bottom blog and reading up to the current one. The sections stay in some semblance of order that way.
Once your caught up, feel free to jump in where you left off at.
To start at the very beginning, go to the bottom of the page and hit the previous button.
This is un-beta-ed, any blaring errors, please let me know so I can fix'em.
Blank spaces in the text depend on your browser, I have tried, but some of them just won't fix. The only thing I can suggest is try a different browser, IE seems to be the worst for this issue, Foxfire and chrome are better.


text:
Vans Presents 'Lizzie': A Short Film
As the global icon of creative expression, Vans Skateboarding is proud to present Lizzie, a short 35mm film directed by renowned filmmaker Greg Hunt. Unveiling a personal, intimate account of Lizzie Armanto beyond her skateboarding accolades and identity as one of the world's most talented skateboarders, the film is the first to explore Lizzie's life through the lens of those closest to her.
Tapping into stories, memories, and perspectives from fellow friends and skaters— ranging from skate legend and mentor Tony Hawk to Vans' team rider and rising talent Mami Tezuka— Vans and Hunt capture the essence of Lizzie through poignant voiceovers paired against the backdrop of footage from Lizzie's daily life skating, hanging with friends, and celebrating the launch of her very first signature skate shoe.
"Ultimately, I aimed to create something special with this little film," said Hunt, whose previous work includes Vans' Propeller, Alright OK, and Nice to See You skate films, among others. "I've never made anything quite like it. I think it's a beautiful and honest portrait of Lizzie."
Pepper Griptape Promo
Treeline Collective: Seychelles One-Piece Swimsuit Review

redpajama_set_name: RedPajamaCommonCrawl


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Asian markets traded mostly higher on Friday as investors cheered a report saying American officials may be weighing the possibility of easing tariffs on China, in a bid to push forward trade talks.
That optimism lifted shares in the Greater China region: Hong Kong's Hang Seng index rose 1.14 percent in late-afternoon trade. On the Chinese mainland, the Shanghai composite gained 1.42 percent to 2,596.01 while the Shenzhen composite and the Shenzhen component both advanced.
In Japan, the Nikkei 225 added 263.80 points, or 1.29 percent, to 20,666.07 while the Topix index was up 14.39 points, or 0.93 percent, at 1,557.59. South Korea's Kospi gained 17.22 points, or 0.82 percent, to 2,124.28.
Australia's benchmark ASX 200 notched up 0.5 percent to 5,879.6, with all sectors rising.
Still, the news "helped to mitigate the dashed hopes for an announcement of a peace trade deal at the side-lines of the World Economic Forum in Davos from January 22nd-25th," Christy Tan, head of markets strategy and research for Asia at the National Australia Bank (NAB), wrote in a note.
President Donald Trump on Thursday canceled his delegation's trip to Davos, citing the ongoing partial government shutdown. U.S. officials are still expecting Chinese Vice Premier Liu He to visit Washington at the end of January for further trade talks.
The National Australia Bank's Tan questioned if a tariff agreement would be able to turn around China's slowing economy, but analysts at Eurasia Group said that Trump and Chinese leader Xi Jinping's desire to avoid tariff escalation reduces the probability of talks breaking down within the first half of the year.
The U.S. dollar index, which tracks the greenback against a basket of its peers, last changed hands at 96.050 as of 3:14 p.m. HK/SIN.
The yen, viewed as a safe-haven asset, traded at 109.44 to the dollar, weaker than levels near 108.00 earlier in the week. The Australian dollar was at $0.7193, dipping from an earlier high of $0.7205 while the euro fetched $1.1392.


A large country garden including an outdoor swimming pool surrounds the house and there are beautiful views across ancient parkland to our secluded lake, a haven for wildlife. Located in the countryside yet conveniently situated near Junction 8A of the M40 and within easy reach of all the attractions of Oxford, just 5 miles away. An ideal base for exploring the Cotswolds and Chiltern Hills.


text:
Q: Syntax error about XPath in Nokogiri, when combining namespace and node() I'm learning XPath with Nokogiri. The XPath is like this:
xml_doc = Nokogiri::XML(open("test.xml"))
result = xml_doc.xpath("//x:foo", 'x' => 'www.example.com')

I could get the results. But when I perform this call:
result = xml_doc.xpath("//x:node()", 'x' => 'www.example.com')

I get an error:
Nokogiri::XML::XPath::SyntaxError: Invalid expression: //x:node()

Am I doing something wrong?

A: Different from elements, you don't need to use a namespace prefix to match by node(). The following will return all nodes in any namespace just fine:
result = xml_doc.xpath("//node()")

There are several types of nodes in XPath, namely text node, comment node, element node, so on. node() is a node tests which simply returns true for any node type whatsoever. Compare to text() which is another type of node tests that returns true only for text nodes. (See "w3.org > Xpath > Node Tests")
In my understanding, the notion of local name and namespace are only exists in the context of element nodes, so using a namespace prefix along with the node() test simply doesn't make sense.
If you meant to select all elements in a specific namespace use * instead of node():
result = xml_doc.xpath("//x:*", 'x' => 'www.example.com')

redpajama_set_name: RedPajamaStackExchange


text:
LPIR () je tip radarja, ki ga je težko zaznati z opozorilniki na radar. LPIR radar omogoča uporabniku, da išče in sledi tarčam, ne da bi nasprotnik opazil, da ga sledi radar.

Nizka zaznavnost se med drugim doseže z:

 Prilagoditev oddajne moči na minimalno moč, ki je potrebna za sledenje določene tarče
 Zmanjšanje bočnih snopov antene, da drugi sprejemniki izven smeri glavnega snopa težje zaznajo signal
 Naključno spreminjanje frekvence oddanega signala
 Naključno spreminjanje frekvence ponavljanja oddanih pulzov

Primeri modernih LPIR radarjev so AESA in PESA radarji.

Sklici

Zunanje povezave
F-22 Avionika
Detekcija in motenje LPIR radarjev

Radar
Vojaška letala

redpajama_set_name: RedPajamaWikipedia


I can not download the new version of MOBIRISE, I have the following error message : Failed to send request to HTTP server.
Could anyone among you help me?
Thank you very much, actually now it works perfectly.


text:
Koreen: Handing out Masai Ujiri's five-year report card with the Raptors
By Eric Koreen May 15, 2018 8
As soon as he said it, it was jarring to hear.
"I have never done this, just to be clear."
Those words came from Masai Ujiri, the Raptors' president, on Friday on the occasion of Dwane Casey's firing. It seemed impossible that Ujiri, who spent three seasons in charge in Denver and has been on the job since 2013 in Toronto, had never fired a coach before. During much of Ujiri's tenure in Denver, rumours swirled that he would fire George Karl. That did not happen until Ujiri left for Toronto, though. With the Raptors, there have been at least three windows in which firing Casey would have made sense; instead, Ujiri waited until the fourth opportunity.
And then it hits you: Masai Ujiri has been at the top of the Raptors' basketball operations for almost five years, with his anniversary coming at the end of the month. It really does not feel like that, perhaps because so much of the Raptors' history before Ujiri got here...


Davies started his career at Reading, featuring 4 times for the Championship club during the 2009-10 campaign. During his time with the Royals, Davies featured for a number of Football League clubs on loan including Aldershot, Wycombe and Bristol Rovers, before leaving to join Crawley in the summer of 2011, playing a crucial part in their promotion from League Two. The following season, Davies found first team opportunities hard to come by and dropped back down to League Two, firstly on loan at Aldershot for the third time in his career, then permanently with Oxford United.
During his time with Reading, Davies also earned 3 caps for the Republic of Ireland Under 21s.
At the end of 2013-14 campaign, Davies dropped out of the Football League, featuring firstly for Dunstable Town, before spells at Wealdstone and Oxford City, where he was named captain and from whom he joined Chelmsford.


Mohammed Elneny has been given the Premier League green light to make his Arsenal debut at Stoke on Sunday.
Arsene Wenger has revealed that the new midfielder signing, who was unveiled by the club on Thursday, has been registered in time for the trip to the Britannia Stadium.
"He's available for Sunday," said Wenger at his media briefing on Friday morning.
Premier League rules state that new signings must be registered by 12pm on the Friday before weekend matches.
Manager Arsene Wenger might decide that he is not ready to play in such a demanding fixture as Stoke after being holed up in France for a week while he awaited visa clearance.
Wenger is delighted to complete the signing of Elneny and is convinced that the 23-year-old has the qualities to be a significant addition to his squad.


text:
Q: Swift Framework built with New Build System not recognized by Objective-C When I integrate my Swift Framework into an Objective-C project, after using Xcode's New Build System, the project does not recognize the public class names and api from the framework.
I'm receiving a 'Use of undeclared identifier 'SampleClassName' error when I go to build the project.
I have updated my Swift 5 framework's build script to  use Xcode's new build system. The build script creates a fat binary that can be imported into any Xcode project (we provide a strip unused architectures run script) to remove the unused archs.
I have tried the following to resolve this issue with no luck:
- set Project Build Setting 'Defines Module' -> Yes
- I have tried explicitly stating which architectures to build for
- set 'Always embed Swift Standard Libraries' -> YES
This is the way I am defining our public class
open class SampleClassName: NSObject {

  // a public class definition within my framework
  @objc public static fun run() -> Bool { ... }

}

Our {ProjectName}.h file implementation
//! Project version number for SampleProject.
FOUNDATION_EXPORT double SampleProjectVersionNumber;

//! Project version string for SampleProject.
FOUNDATION_EXPORT const unsigned char SampleProjectVersionString[];

// In this header, you should import all the public headers of your framework using statements like #import <SampleProject/PublicHeader.h>

Our {ProjectName}-Bridging-Header.h implementation
#include "SystemUtils.h"
#import <CommonCrypto/CommonCrypto.h>

This is the ruby build script I use to create the fat binary.
#!/usr/bin ruby

require 'open3'
require 'optparse'
require 'plist'

PROJECT_DIR        = Dir.pwd
PROJECT_NAME       = 'SampleProject'

BUILD_DIR          = PROJECT_DIR+'/'+PROJECT_NAME
DERIVED_DATA       = 'DerivedData'
FRAMEWORK_NAME     = 'SampleProjectFramework'
OUTPUT_NAME        = 'SampleFramework'
UNIVERSAL_BUILD    = 'Release-universal'
WORKSPACE_DIR      = '..'

def run(command)
  puts command
  stdin, stdout, stderr = Open3.popen3(command)
  out = stdout.readlines
  puts out
  err = stderr.readlines
  [out.to_s, err.to_s]
end

def clean_build
  Dir.chdir("#{PROJECT_NAME}")
  run("rm -rf build")
  Dir.chdir("..")
end

def clean_deriveddata
  Dir.chdir("#{PROJECT_NAME}")
  run("rm -rf #{DERIVED_DATA}")
end

def create_universaldir
  Dir.chdir("#{BUILD_DIR}")
  run("mkdir #{DERIVED_DATA}")
  Dir.chdir("#{DERIVED_DATA}")
  run("mkdir #{UNIVERSAL_BUILD}")
  Dir.chdir("#{PROJECT_DIR}")
end

def create_ios(architecture)
  Dir.chdir("#{BUILD_DIR}")
  command = "xcodebuild -workspace SampleProject.xcworkspace -scheme #{FRAMEWORK_NAME} ONLY_ACTIVE_ARCH=NO -configuration Release -sdk #{architecture} BUILD_DIR=#{BUILD_DIR}/#{DERIVED_DATA} BUILD_ROOT=#{BUILD_DIR}/#{DERIVED_DATA} -UseNewBuildSystem=YES OTHER_SWIFT_FLAGS='-D RELEASE -D EXLUDE_PROXY -D NOIDFA' build"

  run(command)
  Dir.chdir('..')
end

def copy_structure
  run("cp -R #{BUILD_DIR}/#{DERIVED_DATA}/Release-iphoneos/#{FRAMEWORK_NAME}.framework #{BUILD_DIR}/#{DERIVED_DATA}/#{UNIVERSAL_BUILD}/")
end

def copy_swift_modules
  swift_simulator_modules_dir = "#{BUILD_DIR}/#{DERIVED_DATA}/Release-iphonesimulator/#{FRAMEWORK_NAME}.framework/Modules/#{FRAMEWORK_NAME}.swiftmodule/."
  command =
  "if [ -d #{swift_simulator_modules_dir} ]; then
    cp -R #{swift_simulator_modules_dir} #{BUILD_DIR}/#{DERIVED_DATA}/#{UNIVERSAL_BUILD}/#{FRAMEWORK_NAME}.framework/Modules/#{FRAMEWORK_NAME}.swiftmodule
  fi"
  run(command)
end

def create_universal_binary
  command = "lipo -create -output '#{BUILD_DIR}/#{DERIVED_DATA}/#{UNIVERSAL_BUILD}/#{FRAMEWORK_NAME}.framework/#{FRAMEWORK_NAME}' '#{BUILD_DIR}/#{DERIVED_DATA}/Release-iphonesimulator/#{FRAMEWORK_NAME}.framework/#{FRAMEWORK_NAME}' '#{BUILD_DIR}/#{DERIVED_DATA}/Release-iphoneos/#{FRAMEWORK_NAME}.framework/#{FRAMEWORK_NAME}'"
  run(command)
end

def copy_to_project
  command = "cp -R '#{BUILD_DIR}/#{DERIVED_DATA}/#{UNIVERSAL_BUILD}/#{FRAMEWORK_NAME}.framework' '#{BUILD_DIR}'"
end

def put_title(message, sep = "-")
  total_message =  "#{(sep * 10)} #{message} #{(sep * 10)}"

  puts "\n\n\n"
  puts sep * total_message.length
  puts total_message
  puts sep * total_message.length
end

def main
  put_title 'Cleaning build'
  clean_build

  put_title 'Cleaning DerivedData'
  clean_deriveddata

  put_title 'Creating Universal Directory'
  create_universaldir

  put_title 'Creating iOS device version'
  create_ios('iphoneos')

  put_title 'Creating iOS simulator version'
  create_ios('iphonesimulator')

  put_title 'Copying framework structure to the Universal build'
  copy_structure

  put_title 'Copying Swift Modules'
  copy_swift_modules

  put_title 'Creating Universal Binary'
  create_universal_binary

 put_title 'Copy to project dir'
 copy_to_project
end

if __FILE__ == $0
  main
end

The main change that is now causing the 'Use of undeclared identifier error' is switching to the new build system.
I expect the public classes to be recognized by the Objective-C project files. Unfortunately, I do not know why they are not being recognized.


text:
'Monster' cosmic blast zipped harmlessly by Earth
Updated: 12:49 PM PST Nov 21, 2013
SOURCE: NASA
Astronomers call it the monster. It was the biggest and brightest cosmic explosion ever witnessed. Had it been closer, Earth would have been toast.Orbiting telescopes got the fireworks show of a lifetime last spring when they spotted what is known as a gamma ray burst in a far-off galaxy.The only bigger display astronomers know of was the Big Bang that created the universe - and no one, of course, was around to witness that."This burst was a once-in-a-century cosmic event," NASA astrophysics chief Paul Hertz said at a news conference Thursday.But because this blast was 3.7 billion light-years away, mankind was spared. In fact, no one on Earth could even see it with the naked eye.A gamma ray burst happens when a massive star dies, collapses into a brand-new black hole, explodes in what's called a supernova and ejects energetic radiation. The radiation is as bright as can be as it travels across the universe at the speed of light.A planet caught in one of these bursts would lose its atmosphere instantly and would be left a burnt cinder, astronomers say.Scientists might be able to detect warning signs of an impending gamma ray burst. But if one were headed for Earth, there wouldn't be anything anybody could do about it.NASA telescopes in orbit have been seeing bursts for more than two decades, spotting one every couple of days. But this one, witnessed on April 27, set records, according to four studies published Thursday in the journal Science.It flooded NASA instruments with five times the energy of its nearest competitor, a 1999 blast, said University of Alabama at Huntsville astrophysicist Rob Preece, author of one of the studies.It started with a star that had 20 to 30 times the mass of our sun but was only a couple of times wider, so it was incredibly dense. It exploded in a certain violent way.In general, gamma ray bursts are "the most titanic explosions in the universe," and this one was so big that some of the telescope instruments hit their peak, Preece said. It was far stronger and lasted longer than previous ones."I call it the monster," Preece said. In fact, one of the other studies, not written by Preece, used the word "monster" in its title, unusual language for a scientific report.One of the main reasons this was so bright was that relative to the thousands of other gamma ray bursts astronomers have seen, the monster was pretty close by cosmic standards. A light-year is almost 6 trillion miles.Most of the bursts NASA telescopes have seen have been twice as distant as this one. Other explosions could be this big, but they are so much farther away, they don't seem so bright when they reach Earth, the studies' authors say.Astronomers say it is incredibly unlikely that a gamma ray burst - especially a big one like this - could go off in our galaxy, near us. Harvard's Avi Loeb, who wasn't part of the studies, put the odds at at least 1 in 10 million.Our galaxy doesn't have many of the type of star that lends itself to gamma ray bursts, said Charles Dermer, a co-author of the studies and an astrophysicist at the U.S. Naval Research Laboratory."The chance of anything happening and being dangerous is virtually nil," Dermer said.Also, because a burst is concentrated like a focused searchlight or a death beam, it has to be pointing at you to be seen and to be dangerous."Either it's pointed at us or it's not," Preece said. "If it's not, yay! Civilization survives and we see maybe a supernova. If it were pointed at us, then it matters very much how far away it is in our galaxy. If it's in our local arm, well, we had a good run."Some theorize that a mass extinction on Earth 450 million years ago was caused by a gamma ray burst in a nearby part of our galaxy, but Dermer said that's unlikely.We don't see gamma ray bursts from the surface of Earth because the atmosphere obscures them and because most of their light is the type we cannot see with our eyes. That's why NASA has satellites that look for them.This burst was so bright telescopes on Earth saw a brief flash in the constellation Leo.For scientists, this was a wow moment."These are really neat explosions," said Peter Michelson, a Stanford physicist who is the chief scientist for one of the instruments on a NASA gamma ray burst-spotting telescope. "If you like fireworks, you can't beat these. Other than the Big Bang itself, these are the biggest there are."The burst "is part of the cycle of birth and life and death in the universe," Michelson said. "You and I are made of the stuff that came from a supernova."
Astronomers call it the monster. It was the biggest and brightest cosmic explosion ever witnessed. Had it been closer, Earth would have been toast.
Orbiting telescopes got the fireworks show of a lifetime last spring when they spotted what is known as a gamma ray burst in a far-off galaxy.
The only bigger display astronomers know of was the Big Bang that created the universe - and no one, of course, was around to witness that.
"This burst was a once-in-a-century cosmic event," NASA astrophysics chief Paul Hertz said at a news conference Thursday.
But because this blast was 3.7 billion light-years away, mankind was spared. In fact, no one on Earth could even see it with the naked eye.
A gamma ray burst happens when a massive star dies, collapses into a brand-new black hole, explodes in what's called a supernova and ejects energetic radiation. The radiation is as bright as can be as it travels across the universe at the speed of light.
A planet caught in one of these bursts would lose its atmosphere instantly and would be left a burnt cinder, astronomers say.
Scientists might be able to detect warning signs of an impending gamma ray burst. But if one were headed for Earth, there wouldn't be anything anybody could do about it.
NASA telescopes in orbit have been seeing bursts for more than two decades, spotting one every couple of days. But this one, witnessed on April 27, set records, according to four studies published Thursday in the journal Science.
It flooded NASA instruments with five times the energy of its nearest competitor, a 1999 blast, said University of Alabama at Huntsville astrophysicist Rob Preece, author of one of the studies.
It started with a star that had 20 to 30 times the mass of our sun but was only a couple of times wider, so it was incredibly dense. It exploded in a certain violent way.
In general, gamma ray bursts are "the most titanic explosions in the universe," and this one was so big that some of the telescope instruments hit their peak, Preece said. It was far stronger and lasted longer than previous ones.
"I call it the monster," Preece said. In fact, one of the other studies, not written by Preece, used the word "monster" in its title, unusual language for a scientific report.
One of the main reasons this was so bright was that relative to the thousands of other gamma ray bursts astronomers have seen, the monster was pretty close by cosmic standards. A light-year is almost 6 trillion miles.
Most of the bursts NASA telescopes have seen have been twice as distant as this one. Other explosions could be this big, but they are so much farther away, they don't seem so bright when they reach Earth, the studies' authors say.
Astronomers say it is incredibly unlikely that a gamma ray burst - especially a big one like this - could go off in our galaxy, near us. Harvard's Avi Loeb, who wasn't part of the studies, put the odds at at least 1 in 10 million.
Our galaxy doesn't have many of the type of star that lends itself to gamma ray bursts, said Charles Dermer, a co-author of the studies and an astrophysicist at the U.S. Naval Research Laboratory.
"The chance of anything happening and being dangerous is virtually nil," Dermer said.
Also, because a burst is concentrated like a focused searchlight or a death beam, it has to be pointing at you to be seen and to be dangerous.
"Either it's pointed at us or it's not," Preece said. "If it's not, yay! Civilization survives and we see maybe a supernova. If it were pointed at us, then it matters very much how far away it is in our galaxy. If it's in our local arm, well, we had a good run."
Some theorize that a mass extinction on Earth 450 million years ago was caused by a gamma ray burst in a nearby part of our galaxy, but Dermer said that's unlikely.
We don't see gamma ray bursts from the surface of Earth because the atmosphere obscures them and because most of their light is the type we cannot see with our eyes. That's why NASA has satellites that look for them.
This burst was so bright telescopes on Earth saw a brief flash in the constellation Leo.
For scientists, this was a wow moment.
"These are really neat explosions," said Peter Michelson, a Stanford physicist who is the chief scientist for one of the instruments on a NASA gamma ray burst-spotting telescope. "If you like fireworks, you can't beat these. Other than the Big Bang itself, these are the biggest there are."
The burst "is part of the cycle of birth and life and death in the universe," Michelson said. "You and I are made of the stuff that came from a supernova."


text:
//
// SelectionHistoryItem.cs
//
// Author:
//       Jonathan Pobst <monkey@jpobst.com>
//
// Copyright (c) 2010 Jonathan Pobst
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

using System;
using Cairo;

namespace Pinta.Core
{
	public class SelectionHistoryItem : BaseHistoryItem
	{
		private DocumentSelection old_selection;
		private DocumentSelection old_previous_selection;

		private bool show_selection;
		private bool hide_tool_layer;

		public override bool CausesDirty { get { return false; } }

		public SelectionHistoryItem (string icon, string text) : base (icon, text)
		{
		}

		public override void Undo ()
		{
			Swap ();
		}

		public override void Redo ()
		{
			Swap ();
		}

		public override void Dispose ()
		{
            old_selection.Dispose ();
            old_previous_selection.Dispose ();
		}

		private void Swap ()
		{
			var doc = PintaCore.Workspace.ActiveDocument;
			DocumentSelection swap_selection = doc.Selection;
			bool swap_show = PintaCore.Layers.ShowSelection;
			bool swap_hide_tool_layer = doc.ToolLayer.Hidden;

			doc.Selection = old_selection;
			PintaCore.Layers.ShowSelection = show_selection;
			doc.ToolLayer.Hidden = hide_tool_layer;

			old_selection = swap_selection;
			show_selection = swap_show;
			hide_tool_layer = swap_hide_tool_layer;

            swap_selection = old_previous_selection;
            old_previous_selection = doc.PreviousSelection;
            doc.PreviousSelection = swap_selection;

			PintaCore.Workspace.Invalidate ();
		}

		public void TakeSnapshot ()
		{
			var doc = PintaCore.Workspace.ActiveDocument;
			old_selection = doc.Selection.Clone ();
            old_previous_selection = doc.PreviousSelection.Clone ();
			show_selection = PintaCore.Layers.ShowSelection;
			hide_tool_layer = doc.ToolLayer.Hidden;
		}
	}
}

redpajama_set_name: RedPajamaGithub


Published by the National Centre for Literacy and Numeracy for Adults.
A resource for educators outlining the purpose of six reading profiles.
A strand chart for tertiary educators prepared by the Tertiary Education Commission.
A practical 'how to' guide to the Adult Literacy and Numeracy (ALN) Learning Progressions for tertiary educators. Guidance on teaching adult learners to 'read with understanding'.


Dra. Josefa Salmón received the Dux Academicus award at the January 2018 President's Convocation. This is the highest faculty award presented by Loyola University New Orleans. It is given to honor her achievements in scholarship, teaching, and service.
Attached is her speech from the acceptance of the award at the Convocation.
¡Felicidades, Dra. Salmón! A well-deserved honor!


Fully automatic splicing machine CORINGER AFS-48 with auto alignment by the fiber core. Compact and lightweight splicing machine of comfortable and ergonomic design. Software allows splicing of fiber types mainly used fiber optical communication lines to date. Self-powered, wide operating temperature range and wind protection ensure low loss under field conditions. Thanks to suggestions and advice of the leading experts, this model has become the most productive, accurate, fast and reliable on the market of Chinese splicing equipment.
The unit retains all the advantages of the former model AFS-40, but due to the reduced overall dimensions and weight became more compact.
Simultaneously by X and Y with the help of two TV cameras on a 5" LCD, display tilt angle can be changed.
Temperature from -10 to +50°С.


text:
Innovation and Art in Bolzano: REFF and the augmentation of reality
We will be in Bolzano on October 27th for the "Impronta del Digitale" the technological lab of the "Classe dell'Arte" a series of events and conferences organized by the Administration of the Province of Bolzano.
REFF RomaEuropa FakeFactory, Reality Pushers
The main objective of the cycle of events is to confront with the contemporary issues of art systems and to investigate case studies and specific experiences. The meetings and conferences aim to promote a reflection on the mechanisms of contemporary art and cultural systems, to develop economies and social engagement.
In this Framework, the technological lab sees the direct intervention of artists, performers and experts narrating significant case studies and approaches which have been proven successful and meaningful. Talks will mix with workshops, while the presenters demonstrate both their methodological and conceptual approach, and explain the usage scenarios of technologies, frameworks and techniques.
REFF, RomaEuropa FakeFactory, has been invited to the session that will be held on October 27th at the Centro Culturale Trevi to present and discuss the innovative scenario created during the story of the project.
Specifically, REFF will present:
the concept of meta-brand as a framework for innovation in cultural practices, and for the creation of pragmatic opportunities for artists, researchers and cultural operators
the idea of the "fake institution" which was used by REFF to create a globally active cultural ecosystem dedicated to the practices of collaboration and radical innovation in art practice and cultural policies
the methodological "reinvention of reality", a novel approach through which technologies, networks and ubiquitous publishing tools have been used to create artworks, performances, initiatives, collaborations and research projects whose main goal was to "augment reality" by enacting new operative spaces promoting freedom of expression, freedom of innovation and a wide range of innovative scenarios creating opportunities for all parties involved
The methodological and conceptual discourse will be interleaved with the presentation of the technological tools used to create these scenarios including:
advanced networking tools
radical social networking practices and tools
open source tools for ubiquitous publishing and augmented reality
radical open source tools for global knowledge sharing, education, research and collaboration processes
These tools have been used by the REFF group (and by its promoters at Art is Open Source and FakePress Publishing) to enact planetary innovation processes, spawning multiple projects and receiving institutional appraisal worldwide.
The presentations will be completed by a poetic scenario realized under the form of an interactive installation.
The REFF fake institution has been known to promote its global youth program on the possibilities to "reinvent reality" with the provocative distribution of an Augmented Reality Drug. The ARDrug, featured at multiple festivals and in schools and universities in multiple countries, is said to "change your perception of reality", just as a classical psychoactive drug, and is in effect an open source software that can be used to create autonomous layers of digital information and interaction which are stratified onto the ordinary reality.
The REFF collective will materialize a "Reality Pusher laboratory" at the Centro Trevi, showing through an interactive installation the creation of the AR Drug.
More info at:
Art is Open Source
Provincia Autonoma di Bolzano
Classe dell'Arte: L'impronta del Digitale


Hammerhead General Contractors Ltd was founded by Emil Waszkiewicz in 2010 and works throughout London and the Home Counties.
After an early career as a fine dining chef, Emil launched Hammerhead GC; a bespoke one-stop-shop design and build company for residential and commercial projects. He provides unparalleled attention to detail, whether it be during the original design phase, throughout a build or during decorative projects.
Hammerhead covers both the domestic and commercial markets, and ranges from loft and basement conversions to new build projects, renovations and everything else in between.
He works regularly with a select team of tried and tested, specialist contractors, as well as regular collaborations with a number of leading west London architects and design companies.
Emil prides himself having created a design and build company that is fully transparent and excels at collaborating, liaising and communicating fully with clients at every stage of the project.
Hammerhead is a one stop shop for domestic and commercial building projects. Our range of experience and expertise enables practical inspiration, bespoke creativity and flexibility for each project, whilst adhering to client budget.
Hammerhead has been responsible for several new build projects, loft and basement extensions as well as house and commercial property renovations. We also work on smaller standalone projects such as bathroom and kitchen refurbishments.
With our combined expertise in all aspects of construction, extensions, renovations and alterations we will help with all aspects of a building project. We are fully insured for your peace of mind.
Since launching we have also been called in to rescue several failed projects where clients have been left in the lurch by other contractors and have been responsible for turning these around to a successful conclusion.
We always provide prospective clients with at least two references and can arrange for site visits on request.
At Hammerhead, we believe that everything is possible – whatever your concerns, physical constraints or budgetary boundaries, we will do our best to find a solution…. but don't take our word for it.. take a look at our testimonials to see what our clients say about us.
Hammerhead has the expertise, experience and scale to undertake large domestic and commercial projects but is still small enough to care about each individual client.
We pride ourselves on understanding the stresses associated with carrying out building works of any kind. It goes without saying that choosing the right builder is crucial in minimizing that stress and for us, it's all about collaboration and communication. We will take you through each stage from the initial meeting through to handing over the key of the door to a new property.
After six years, Hammerhead has built up a solid reputation – most of our projects come through personal recommendation. Several clients have also engaged Hammerhead for multiple projects, testimony to our attention to detail to the very end of each project.


text:
Q: Script to pull hashes out of large text file I am attempting to write a script that will pull out NTLM hashes from a text file that contains about 500,000 lines of data. Not all accounts contain hashes and I only need the ones that do contain hashes.
Here is a sample of what the data looks like:

Mango Chango A (a):$NT$547e2494658ca345d3847c36cf1fsef8:::

There are thousands of other lines in the file, but that particular line is what I need taken out of the file. There are about 100 lines that apply to that and I do not want to manually go through the entire file searching for that.
Is there an easy script or something I can run in Linux to pull lines that follow that pattern out of the file?
Thank you!

A: grep '\$NT\$'filename
If there might be other occurrences of $NT$ outside the field you're looking for, you could be more specific - this will find only lines that have it in the second colon-delimited field:
awk -F: '$2 ~ /\$NT\$/'filename

A: Another variation on specificity:
grep -E ':\$NT\$[[:alnum:]]{32}:'

You could use range, if necessary:
grep -E ':\$NT\$[[:alnum:]]{30,34}:'

or be more general:
grep -E ':\$NT\$[[:alnum:]]+:'

[:alnum:] is a named class of characters which includes all the alphabetic characters, upper and lower, and all the numeric characters in your current locale.
Other character classes include [:alpha:], [:cntrl:], [:digit:], [:graph:], [:lower:], [:print:], [:punct:], [:space:], [:upper:], and [:xdigit:].
I would have used [:xdigit:], but the has includes an "s".

A: In Bash and many other shells:
grep ":$NT$" your_file.txt

Quotes will let $ pass into pattern unmolested.


text:
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Set in a period property, this spacious ground floor conversion flat comprises of two bedrooms, one with a master ensuite shower room/WC along with a modern open plan kitchen to hallway and open arch to living room with further bathroom/WC. The property is tastefully decorated with lots of personal touches. The property has been secured using an Option Agreement, at a purchase price of £255,000. It requires a minimal refurbishment of £2,000 which will also make it more desirable to rent.
Investors will receive 100% of the net rental income (after deducting mortgage interest payments, managing fees and maintenance costs). The expected monthly rent of £1,100 and a lifetime base rate tracker mortgage rate of 2.9% means an attractive net rental yield (after deducting all rental costs) of 5.69% per year for investors.
The property is in a residential area, close to schools, and has good proximity to transport links at Selhurst and West Croydon rail stations. All this means it has strong rental and growth potential.
This strategy involves an Option Agreement to buy or sell the property as outlined in the contracts upon investing. The investor funds are used for the deposit and other acquisition costs. Crowd with Us take over the seller's mortgage with the Option contract drafted by a specialist property lawyer. Once the property value has increased by 50% in relation to the total acquisition costs (after the deduction of sales costs), the property will be sold and upon completion the sale profits will be split 50/50 between Develop with Us and the Investors. For this deal, the Investor funds are 26% of total acquisition costs and the Investors receive 50% of the property sale profits, hence the highly leveraged projected return.
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[Maria] Butina was another pawn on the chess board...Lots of people were doing lots of different things, all with the same goal. Butina was...another pathway to possibly reach Trump himself and influence the campaign.
Moscow has been harassing commercial ships bound for Ukraine's ports in the Sea of Azov for months...The attack on naval vessels now opens a new front in Russia's four-year aggression against Ukraine, which includes the ongoing land war in Ukraine's east and the occupation of Crimea.


TW OVEN CLEANER is highly effective for the removal of baked-on fats, greases and carbon deposits normally found in baking ovens. Also recommended for grills, deep fryers and undersides of range hoods or canopies, where grease and carbon accumulate. TW OVEN CLEANER is nonflammable and U.S.D.A. acceptable in meat and poultry plants.
TW OVEN CLEANER is a green liquid solution formulated to assure rapid emulsification, and thorough penetration. It has medium alkalinity (contains caustic), a pH of 11 .7 at 1% dilution and is biodegradable.
OVENS & EQUIPMENT - For first time cleaning of heavy carbon and grease, use UNDILUTED.
Thereafter, use 1:1 to 1:3 with water.
Using a spray bottle, apply to all interior surfaces of the oven. Allow cleaner to penetrate for five minutes.
Rinse with wet sponge, to remove all grease and carbon residue.
For best results, use on 160�F to 200�F (depending on soil build-up) heated oven. Spray on with spray unit, direct from gallon bottle of solution. Foaming action resulting from this application method, allows product to cling to walls and top sides of oven, thus, cleaner works harder. Can be applied with good results on cold oven when cleaner is allowed to set 15 to 20 minutes.
Heavily encrusted ovens may require a second application. One application will be adequate for periodically cleaned ovens.
GRILLS - Use 1:1 to 1:3 with water.
HOODS - Use 1:4 with water.
FRYERS - Use 1:15 with water.
STEAK PLATTERS - Use 1:1 with water.
Alkaline - Do not swallow. Avoid contact with eyes or prolonged contact with skin. For skin contact, flush with water. For eye contact, flush with clean water for 15 minutes. Seek medical attention.


In Part 2 we developed a new active current source for the Zen amplifier. In this part, we create a power supply regulator suitable for the Zen amplifier projects.
Previous versions of the Zen amplifiers had no power supply regulation at all, or used capacitor/inductor/capacitor "pi" filters to smooth the ripple on the DC supply lines. In keeping with our philosophy of simple-aspossible, we want to develop a supply regulation system which gives us good regulation, with low AC noise and a stable DC value.
The need for a good regulator is obvious enough. As simple as they are, the Zen amplifiers do not have particularly great power supply rejection ratios (PSRR), the measure of how much of the power supply variations bleeds into the signal path. In the original Zen amplifier, ripple voltages of 1 volt or so typically caused 2 milliVolts or more of the same noise on the output of the amplifier. In this case the PSRR is about 500 to 1, or about -54 dB. 2 milliVolts might seem sufficiently low, that is until you hook the amp up to a 110 dB sensitive horn midrange, and then you will start looking for less noise.
You can make the PSRR of the amplifier higher, or you can clean up the supply. A "pi" filter will take out most of the ripple, but will not stabilize the value of the DC against fluctuations in AC line voltage. For this you need an active regulator.
Figure 1 shows an N channel MOSFET set up as a voltage follower regulator. The Drain gets power from the positive unregulated supply, the Gate is presented with a positive reference voltage, and the Source delivers the value of the reference voltage minus the Gate-Source voltage of the MOSFET (Vgs), which is about 4 Volts. To get the correct regulated output voltage, the reference will be adjusted by this amount greater than the desired output.
The output impedance of this circuit is fairly low, being the inverse of the transconductance figure of the MOSFET, which for the IRFP240 is about 5 Siemens, which means that the output impedance will be about .2 ohms.
more Volts more of unregulated supply voltage than the output voltage. 4 of those Volts are used up by the Vgs of the MOSFET, and about 3 Volts are required send 2 mA of current through R1 at 1500 ohms.
If the capacitance of C1 is substantial, we will want to include D1. D1 provides a path for the charge on C1 in the event that the main or regulated supply is discharged much more rapidly than C1, in which case the voltage on C1 might be enough to damage the Gate of the MOSFET Q1, which is rated at a maximum of 20 Volts Gate-Source. A high value of C1 not only improves the value of the noise on the regulated supply, but also gives a very slow turn-on time, which can aid in avoiding transient turn-on noises in the amplifier, depending on the design of the amplifier. In the case of the Zen circuits, it is a definite help.
R2 is included to suppress any parasitic oscillation on the part of the MOSFET. The intrinsic bandwidth of a MOSFET is very high, and this much speed in a part can make an oscillator out of even the modest stray capacitance and inductance found in ordinary hook up wire, so we slow it down just a bit with a Gate resistor.
You will note that R1 has been increased to 1500 ohms for the purposes of the next section's modification.
Q5 in this circuit must dissipate the amplifier's bias current of 2 Amps with 10 Volts across the Drain to Source. This equals 20 watts of dissipation, and Q5 should have the appropriate heat sinking for this, which would be approximately 1 deg C. per watt.
The performance of the circuit of Fig 3 is quite good, taking the Zen amp to 20 watts at .7% distortion. The unregulated supply for this circuit had an AC ripple of 3 Volts peak-to-peak, and regulated supply's noise was 10 mV peak-to-peak, which is a reduction of 50 dB. It resulted in a few microVolts of supply ripple on the output of the amplifier.
The output voltage of the regulator varies with the output current of the amplifier, and with 1.8 amp output peak, we saw a .35 volt peak on the output of the regulator, giving a .2 ohm output impedance, close to what we expected. If this is not good enough, there are still ways to improve it without recourse to feedback.
appreciates a quiet and stable supply, and previously we have only seen it with "pi" filtering.
We do not modulate this particular supply as it sources two halves of a balanced channel which operated out of phase. The supply draw of this circuit is truly constant at all times, a "zero sum game" for the circuit. By contrast, the Zen has a constant draw averaged over time, and the instantaneous draw from the supply reflects the output current of the amplifier.
There are instances where we want the supply to deliver more voltage and current. Since the MOSFETs and other parts can easily be set up to handle 100 Volts or more, the issue comes down to current and dissipation. The circuits presented here are capable of 4 Amps continuously with moderate dissipation on the series pass transistors, but more current will require parallel devices.
Figure 7 shows additional parallel transistors added to the circuit of figure 6. These devices are best matched for Vgs within .1 Volts to ensure that they do a good job of sharing the output current. They also use Source resistors at .1 ohm each to further encourage the transistors to share the current equally.
So now we have a nice simple regulator for this and future Zen amp projects. It is not the highest performing regulator, but we don't need high precision for these amplifiers, and as long as the amplifier is biased Class A, any voltage appearing on the supply will be a linear function of the output waveform, and is benign in its character. Of course if you want a lower source impedance, you can start paralleling devices and/or piling on the output capacitance.
In Part 4 we will wrap up the Penultimate Zen with an input buffer and PC artwork.
This figure is not particularly great as a regulator, and ordinarily we would look to improve on it, usually by enclosing the regulator transistor in a feedback loop to correct for this variation. If this were a higher power Class B or AB type amplifier, such an output impedance could easily result in one or two Volts of nonlinear distortion signal in the power supply, and this would bleed into the output circuit as distortion.
With a Class A amplifier, we have the advantage that the current draw from the supply is a linear function of the output current, and so no distorted "half waveform" is seen impressed on the supply voltage. This being the case, the importance of the output impedance becomes less, and we can consider using this follower without feedback.
Figure 2 embellishes on the concept of the one transistor follower. In this circuit R1 is used to bias up the Zener (not related to Zen) diodes which provide the reference voltage. A capacitor C1 is placed in parallel with Z1 and Z2 to remove the intrinsic noise of the Zeners and further smooth the ripple out of the reference voltage. C1 is not essential, and can be a large or small value.
We will want to send about 2 milliAmps or so through the Zener diodes to get it into the proper voltage region. Z1 plus Z2 have been chosen to be 4 Volts above the desired regulated voltage, and some more voltage will be needed across R1 to deliver the current through Z1 and Z2. If the regulated voltage is to be 40 Volts DC, and the Zener diodes sum to 44 Volts, and the unregulated supply is 47 Volts, then R1 will have 3 Volts across it, and will want to be about 1500 ohms in value.
serious capacitance, for example 40,000 uF represents .2 ohms at 20 Hz.
The circuit does not actually require the use of Zener diodes to work well for many purposes. If you take the Zener diodes out, then the circuit simply filters out the AC voltage from the supply value, leaving the DC value and giving a DC output voltage about 4 Volts less than the unregulated voltage. I prefer the value stability with the Zeners in, as they represent only a small investment in parts.
In this project I use several Zener diodes in series, building up higher voltages from smaller voltage Zeners. I do this mostly for reliability. Five 1/2 watt Zener diodes at 9.1 Volts each can take five times the bias current of a single 45.5 volt Zener, and if the AC line voltage goes very high, it might have to. Using multiple Zeners in a stack also gives some flexibility in getting exactly the value you want, as seen in Figure 3, where one of the 9.1 Volt Zeners is replaced by 7.5 Volts to get the 44 Volts desired. You might ask me, "Why do you always use 9.1 Volt 1N4739's in your projects?" The answer is that I have a lot of them on the shelf, and I am very comfortable with them. You might also ask, "Why an IRFP240 instead of some other MOSFET or even a Bipolar transistor?" Same answer.
Figure 3 shows the circuit of Figure 2 applied to our Zen amp. Q5 is the new name of our pass transistor and Z1 through Z5 form the Zener reference. In this circuit, the unregulated voltage is about 47 Volts, and the regulated voltage is about 40 Volts. R24 passes about 2 mA through the Zener stack, and C9 and C10 provide additional filtering.
The values of C9 and C10 are arbitrary, and can be made quite large or small as you like. As you increase the value of C10, keep in mind that very large caps have some leakage current which might exceed the bias current value, so figure on having less than 10,000 uF or so for C10. Very high values for C9 might have the effect of overheating the MOSFET on turn-on, but by high I mean maybe 100,000 uF. You can eliminate C10 altogether, but I suggest a minimum of .1 uF for C9.
The 14 watt loss on the MOSFET pass transistor is a bit much to put up with. Figure 4 shows a technique by which we can modulate the regulated supply voltage with the output signal of the amplifier, allowing the regulated supply to swing up to within a Volt of the unregulated supply, increasing the peak-to-peak output swing by about 6 Volts, and our power from 20 watts to 25 watts.
R25 and C11 have been added, communicating a portion of the output voltage of the amp to the Gate of the pass transistor, causing the regulated output to reflect a small version of the output wave and giving the circuit a small boost at high output levels. Note that the output capacitor C9 in this case is now 1 uF so that the regulator does not have to drive a large capacitor. Note also that the standing DC value for the output voltage of the amplifier is not 20 Volts, or ½ the regulated supply, but 23 Volts, to better take advantage of the higher peak supply voltage.
The performance of the Zen amp with this modification is shown in Figure 5, where the clipping point is modestly improved to 25 watts rms.
is .1 ohm plus .2 ohms = .3 ohms. If you parallel two such devices, you will get .15 ohms, and with 6 such devices you will get about .05 ohms and so on.
First presented in the A75 project in issue 2/92 of The Audio Amateur, the setup and procedure for matching the Vgs of power MOSFETs is simplicity itself. We repeat it here with slight modification in Figure 8. Using a car battery voltage or a 15 Volt regulated supply, we bias the MOSFET up as shown through a 10 ohm 10 watt resistor, with the Gate attached to the Drain. With the Vgs measuring about 4 Volts, we will see about 10 Volts across the resistor, and about 1 Amp of current through the device. With the devices at about the same temperature, measure the Vgs for a few seconds only (the device will heat up within 20 seconds or so) with a DC voltmeter and make note of the value. Those devices which are within .1 Volts or better can be considered a match for these purposes. The circuit for the N channel devices is shown on the left, and for the P channel devices on the right.
As a practical matter, in deciding how many to parallel, consider that the output devices will be very reliable at up to about 25 watts if provided with enough heat sinking to keep the case at 60 degrees Centigrade or so. To give you a rough sense of where the parts become unreliable, experience shows that when you run them at 50 watts at 70 degrees, you will occasionally lose one, as I did last week. No matter, DIYers are a fearless breed, we keep lots of spares, and it took about 10 minutes to pop another one in.
You can pretty easily substitute NPN and PNP Bipolar Darlington devices as the series-pass transistors in these schematics without loss of quality, and in the case of paralleling devices as in Figure 7, you can do so without matching the devices. Darlington types are necessary, however, for while the current gain of a MOSFET is practically infinite, the Bipolar device requires a finite DC input current. This is typically about 300 or 400 micro-Amps per output Amp. In high current regulators, you will want to provide slightly extra current going through the Zener stack to accommodate this.


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"Dear.M" Broadcast Reportedly Delayed Indefinitely Until Park Hye Soo's Bullying Allegations Are Settled, KBS Comments
Published January 11, 2022 4:58 pm By Hilda MooreCategorized as K-Dramas and K-Movies
"Dear.M" broadcast might be delayed for an even longer time.
On January 11, one media outlet exclusively reported that "Dear.M" premiere has been put on hold for the year 2022. The drama was originally scheduled to premiere in February.
However, Park Hye Soo's bullying allegations came out in mid-February and as a result, the premiere of "Dear.M" was pushed back indefinitely, KBS then announced their decision to air "Imitation" before "Dear.M."
An official from KBS commented, 'we're currently confirming the facts,' in response to the report. But for now, KBS says it seems to be difficult to air the drama in the first half of 2022.
Previously, fans had petitioned to kick out Park Hye Soo from the drama, however, a source from KBS stated the drama has been put on hold while the allegations against Park Hye Soo are being verified through police investigation, KBS will wait until a verdict comes out and will implement changes accordingly such as re-shoots and more.
The issue became bigger for KBS since "Dear.M" was a pre-produced drama, meaning it was shot completely before its premiere putting KBS in a difficult spot, re-shoots would not only be expensive but could face difficulties depending on the actors availability to re-shoot depending on their schedules.
Park Hye Soo has vehemently denied the bullying allegations made against her, and despite her strong response and the fact that her label is taking strict legal action public opinion on her remains largely negative.
"Dear.M" is led by Park Hye Soo, NCT Jaehyun, and more.
Source: (A)
Tagged Dear.M


D-News and the Arts: Write Your Own Coverage!
In today's Salt Lake Tribune, Glen Warchol reported on a meeting between leaders of Salt Lake City arts organizations and Gilbert, expressing their concern that the "new direction" of the Deseret News could result in a lack of media coverage critical to those organizations. According to the story, Gilbert came up with plenty of reassuring alternatives to actually having writers on staff to cover these organizations. He proposed the possibility of "citizen experts" for writing such stories; he even, as reported by Warchol, suggested that arts groups could "write their own advance and preview stories."
To the credit of several of those invited -- and some who weren't -- these proposals were not exactly greeted with enthusiasm. Pioneer Theatre Company marketing director Kirsten Park described the auto-promotion proposal as "problematic;" Plan-B Theatre Company's Jerry Rapier, who was not invited to the meeting, accurately identified the difference between someone who knows a subject area, and someone who knows how to write about it.
In my blog item earlier this week about the Deseret News' decision to use Catholic News Service "reviews" for its film coverage, I suggested that "real, challenging arts criticism may now be about as likely to appear in the paper as real, challenging reporting." And self-serving though it may be to suggest that critical writing skills might actually be a useful tool for those trying to inform readers about performances and other arts events, it's staggeringly depressing to see someone representing a theoretically journalistic organization essentially signing off on organizations writing their own "advertorial" copy.