text:
\section{Introduction}~\label{sec1}
The realization of mixtures of trapped ultracold atomic gases ~\cite{2001Sci...291.2570T,PhysRevLett.87.080403,2001Sci...294.1320M,new1,new2} has
opened new paths towards the formation of ultracold diatomic
molecules~\cite{PhysRevLett.97.180404,PhysRevLett.97.120402,2008JPhB...41t3001O,Ni,PhysRevLett.102.020405}, quantum-state control of chemical
reactions~\cite{qstate2010}, prospects for quantum computing with polar molecules~\cite{mille,micheli,2009NJPh...11e5049C}, tests of fundamental
symmetries~\cite{hudson,ray,PhysRevA.80.042508} and studies of fundamental aspects of correlated many-body systems~\cite{tassy}, and dilute quantum
degenerate systems~\cite{hadzi,Roati,regal2,chin,kinast}. Co-trapped diamagnetic-paramagnetic mixtures have also made possible experimental
realization of interspecies Feshbach resonances~\cite{Stan,Inouye,springerlink:10.1140/epjd/e2010-10591-2}, two-species Bose-Einstein condensates and
mixed Bose-Fermi and Fermi-Fermi degenerate gases~\cite{schreck:080403,hadzibabic:160401,Modugno,tassy}.

In an optical lattice, atoms can be trapped in the intensity
maxima or minima of the light field by the optical dipole force~\cite{grimm}.
This force arises from the dispersive interaction of
the induced atomic dipole moment with the intensity gradient of the light field, and is proportional
 to the ac polarizability of the atom.   When its ac polarizability vanishes, as can happen
 at certain wavelengths, an atom experiences no dipole force and thus is unaffected by the presence
 of an optical lattice. Our present work provides accurate predictions of the
``magic-zero wavelengths'' $\lambda_{\rm{zero}}$ which lead to zero Stark shifts for alkali-metal
 atoms. These wavelengths have also been designated as ``tune-out
 wavelengths'' by LeBlanc and Thywissen \cite{LeblancThywissen}.

We suggest some possible uses for such wavelengths, all of which take advantage of the fact
(demonstrated below),
that magic-zero wavelengths are highly dependent upon atomic species and state.
 For a given atomic species and state A,
 let ${\rm L}_{\rm{A}}$ designate an optical lattice or trap made with light at one of the magic-zero wavelengths of A.
We start with a model configuration consisting of the gas A embedded
in ${\rm L}_{\rm{A}}$ and confined by another trap, T.  Some process
is performed on the gas, after which T is turned off.
    Members of A will depart and ${\rm L}_{\rm{A}}$ may confine whatever is left.  For example, one might
     photoassociate some A atoms into dimers during the initial period, and thereby be left with a nearly
     pure population of dimers trapped in ${\rm L}_{\rm{A}}$ at the end.
     LeBlanc and Thywissen \cite{LeblancThywissen}
     have pointed out the advantage of magic-zero wavelengths for traps containing two species.  If another species,
      B, is added to the model configuration, it will ordinarily be affected by ${\rm L}_{\rm{A}}$,
      so B can be moved by shifting ${\rm L}_{\rm{A}}$, while A remains unaffected.  Schemes of this
      type have been used for entropy transfer and controlled collisions between $^{87}$Rb and $^{41}$K
       \cite{PhysRevLett.103.140401,PhysRevLett.104.153202,newa}.
        For bichromatic optical lattice schemes, such as those discussed
        by Brickman Soderberg, {\em et al.} \cite{Soderberg,klinger:013109},
         it could be useful to incorporate ${\rm L}_{\rm{B}}$ into the model
         configuration, so as to be able to move A and B completely independently.
         In another application, a Sr lattice at a $^3$P$_0$ magic-zero wavelength was
         suggested for realization of quantum information processing \cite{srq}.

 In the next section, we briefly discuss the calculation of frequency-dependent polarizabilities
  of alkali-metal atoms. In section~\ref{sec3}, we
present the magic-zero wavelengths for the alkalis from Li to Cs and discuss some of their
applications.

\section{Frequency-dependent polarizabilities}~\label{sec2}

The background to our approach to calculation of atomic
polarizabilities is treated in a recent review
article~\cite{2010JPhB...43t2001M}.  Here we summarize points salient
to the present work. The frequency-dependent scalar polarizability,
$\alpha^v_0(\omega)$, of an alkali-metal atom in its ground state $
v$ may be separated into a contribution from the core electrons,
$\alpha_{\rm{core}}$, a core modification due to the valence
electron, $\alpha_{vc}$, and a contribution from the valence
electron, $\alpha_v(\omega)$. Since core electrons have excitation
energies in the far-ultraviolet region of the spectrum, the core
polarizability dependends weakly on $\omega$ for the optical
frequencies treated here. Therefore, we approximate the core
polarizability by its dc value as calculated in the random-phase
approximation (RPA) ~\cite{datatab2}, an approach that has been quite
successful in previous applications. The core polarizability is
corrected for Pauli blocking of core-valence excitations by
introducing  an extra term $\alpha_{vc}$. For consistency, this is
also calculated in RPA. Therefore, the ground state polarizability
may be separated as
    \begin{equation}
        \alpha_0(\omega)=\alpha_{\rm{core}} + \alpha_{vc} + \alpha_{0}^v(\omega).
    \end{equation}
The valence contribution to the static ac polarizability is calculated
using the sum-over-states approach~\cite{1}:
     \begin{equation}
         \alpha_{0}^v(\omega)=\frac{2}{3(2j_v+1)}\sum_k\frac{{\left\langle
          k\left\|D\right\|v\right\rangle}^2(E_k-E_v)}{
         (E_k-E_v)^2-\omega^2}, \label{eq-1}
      \end{equation}
where $\left\langle k\left\|D\right\|v\right\rangle$ is the reduced
electric-dipole (E1) matrix element.
 In this equation,
$\omega$ is assumed to be at least several linewidths off resonance with the corresponding transitions.  Unless stated otherwise, we use the conventional system of atomic units, a.u., in which $e, m_{\rm e}$, $4\pi \epsilon_0$ and the reduced Planck
constant $\hbar$ have the numerical value 1.  Polarizability in a.u. has the dimension of volume, and its numerical values presented here are
expressed in units of $a^3_0$, where $a_0\approx0.052918$~nm is the Bohr radius. The atomic units for $\alpha$ can be converted to SI units via
 $\alpha/h$~[Hz/(V/m)$^2$]=2.48832$\times10^{-8}\alpha$~[a.u.], where
 the conversion coefficient is $4\pi \epsilon_0 a^3_0/h$ and the
 Planck constant $h$ is factored out.

\begin{table}
\caption{$5s - np$ contributions to the frequency-dependent
polarizability  of the ground state of Rb at
$\lambda_{\textrm{zero}}=423.0448$~nm = 1/(23638.16 cm$^{-1}$).
Absolute values of electric-dipole matrix elements are expressed in
a.u. ($ea_0$), and the corresponding energy differences are expressed
in conventional wavenumber units (cm$^{-1}$ ). \label{tab1} }
\begin{ruledtabular}
\begin{tabular}{lccr}
\multicolumn{1}{c}{Contribution}& \multicolumn{1}{c}{$|\langle5s\|D\|np_{1/2}\rangle|$}& \multicolumn{1}{c}{$E_{np_{j}}-E_{5s}$}&
\multicolumn{1}{c}{$\alpha_0$}\\
\hline
  $5p_{1/2}$ & 4.231&    12579.0&    -41.130\\
  $6p_{1/2}$ & 0.325&    23715.1&     50.235\\
  $7p_{1/2}$ & 0.115&    27835.0&      0.124\\
  $8p_{1/2}$ & 0.059&    29835.0&      0.023\\
  $np_{1/2}$~tail&  &           &      0.085\\   [0.3pc]
  $5p_{3/2}$ & 5.978 &   12816.5&    -84.938  \\
  $6p_{3/2}$ & 0.528 &   23792.6&     66.140  \\
  $7p_{3/2}$ & 0.202 &   27870.1&      0.383  \\
  $8p_{3/2}$ & 0.111 &   29853.8&      0.081  \\
 $np_{3/2}$~tail&    &               & 0.285      \\    [0.3pc]
 $ \alpha_{\textrm{core}}$&    &               &  9.076  \\
  $\alpha_{vc}$   &     &              & -0.367\\
$\alpha_{0}^v$     &     &              & -8.712\\
  Total $\alpha_{0}(\omega)$    &        &    &  0.00\\
\end{tabular}
\end{ruledtabular}
\end{table}

\begin{figure}
  \includegraphics[width=3.6in]{rb.eps}
  \caption{The frequency-dependent polarizability of the Rb ground state.
  The first two zero-magic wavelengths are marked with arrows.}
  \label{fig1}
\end{figure}

\begin{table} [h]
\caption{\label{tab2}  Magic-zero wavelengths $\lambda_{\rm{zero}}$ for alkali-metal atoms from Li to Cs. The resonant wavelengths
$\lambda_{\rm{res}}$ for relevant transitions are also listed. The wavelengths (in vacuum) are given in nm.}
\begin{ruledtabular}
\begin{tabular}{clll}
\multicolumn{1}{l}{Atom}& \multicolumn{1}{l}{Resonance}& \multicolumn{1}{l}{$\lambda_{\rm{res}}$}&
\multicolumn{1}{l}{$\lambda_{\rm{zero}}$}\\
\hline $^6$Li&$2s-2p_{1/2}$     & 670.992478
 &            \\
&                  &       & 670.987445(1)\\
&$2s-2p_{3/2}$     & 670.977380&  \\[0.2pc]
\hline $^7$Li&$2s-2p_{1/2}$     & 670.976658
 &            \\
&                  &       & 670.971626(1)\\
&$2s-2p_{3/2}$     & 670.961561
&  \\
Li&                  &       & 324.18(6)\\
&$2s-3p_{1/2}$ & 323.3576 & \\
&$2s-3p_{3/2}$ & 323.3566 & \\
&                  &       & 274.911(7) \\
&$2s-4p_{1/2}$ & 274.2001& \\[0.2pc]
\hline
Na&$3s-3p_{1/2}$     & 589.7558 &            \\
&                  &       & 589.5565(3) \\
&$3s-3p_{3/2}$     & 589.1583 &  \\
&                  &       & 331.905(3) \\
&$3s-4p_{1/2}$ & 330.3929 & \\
&                  &       &330.3723 \\
&$3s-4p_{3/2}$ & 330.3319 & \\
&                  &       & 285.5817(8) \\
&$3s-5p_{1/2}$ & 285.3850 & \\[0.2pc]
\hline
K&$4s-4p_{1/2}$     & 770.1083 &            \\
  &                &       & 768.971(3) \\
&$4s-4p_{3/2}$     & 766.7009 &  \\
&              &       & 405.98(4) \\
&$4s-5p_{1/2}$ & 404.8356 & \\
&                  &       & 404.72(4) \\
&$4s-5p_{3/2}$ & 404.5285 & \\
&                  &       & 344.933(1) \\
&$4s-6p_{1/2}$ & 344.8363 & \\[0.2pc]
\hline
Rb&$5s-5p_{1/2}$     & 794.9789 &            \\
&                  &       & 790.034(7) \\
&$5s-5p_{3/2}$     & 780.2415 &  \\
&              &       & 423.05(8) \\
&$5s-6p_{1/2}$ & 421.6726 & \\
&                  &       & 421.08(3) \\
&$5s-6p_{3/2}$ & 420.2989 & \\
&                  &       & 359.42(3) \\
&$5s-7p_{1/2}$ & 359.2593 & \\[0.2pc]
\hline
Cs&$6s-6p_{1/2}$     & 894.5929 &            \\
&                  &       &  880.25(4) \\
&$6s-6p_{3/2}$     & 852.3472 &  \\
&              &       & 460.22(2) \\
&$6s-7p_{1/2}$ & 459.4459 & \\
&                  &       & 457.31(3) \\
&$6s-7p_{3/2}$ & 455.6557 & \\
&                  &       & 389.029(4) \\
&$6s-8p_{1/2}$ & 388.9714 &
\end{tabular}
\end{ruledtabular}
\end{table}
The calculation of the ground state frequency-dependent polarizabilities in alkali-metal atoms has been previously discussed in ~\cite{bin1,magic},
and we give only brief summary of the approach.
 The sum  over intermediate $k$ states in Eq.~(\ref{eq-1}) converges rapidly. Therefore, we separate the valence state polarizability into two parts,
  $\alpha_{\rm{main}}$,
containing the contributions from the few lowest $np$ states, and the
remainder, $\alpha_{\rm{tail}}$. We note that our calculations are
carried out with the finite basis set constructed using B-splines
\cite{spline} making the sum finite. In the calculation of
$\alpha_{\rm{main}}$, we use the experimental values compiled in
Ref.~\cite{relsd} along with their uncertainties for the first
$ns-np$ matrix elements, for example the $4s-4p_{j}$ matrix elements
in K. For all other terms, we use the relativistic all-order values
~\cite{review07,relsd} of the matrix elements and the experimental
values of the energies \cite{NIST1,NIST,NIST2}.  In the relativistic
all-order method, all single-double (SD) or single-double and partial
valence triple (SDpT) excitations of the Dirac-Fock (DF) wave
function are included to all orders of perturbation
theory~\cite{relsd,CC2,1}. We conduct additional semi-empirical
scaling of our all-order values (SD$_{\rm{sc}}$) where we expect
scaled values to be more accurate or for more accurate evaluation of
the uncertainties. Our scaling procedure and evaluation of the
uncertainties  of the all-order results have been recently discussed
in Ref.~\cite{ca}. Briefly, the uncertainties of the all-order matrix
elements are given by the spread of their SD, SDpT,  SD$_{\rm{sc}}$
and SDpT$_{\rm{sc}}$ values. These are also used to calculate the
uncertainties in the state-by-state contributions to the
frequency-dependent polarizability. The tail contributions,
$\alpha_{\rm{tail}}$, are calculated in the DF approximation using
complete basis set functions that are linear combinations of
B-splines~\cite{relsdrb}. In the cases treated here, the tail
contribution is of the order of 1\% of the net valence contribution
$\alpha_{0}^v$.

We define the magic-zero  wavelength $\lambda_{\rm{zero}}$ as the wavelength where the
 ac polarizability of the ground state vanishes.  In practice, we calculated $\alpha_0(\omega)$ for a range of values in the vicinity of  relevant resonances and
identified values of $\omega$  where the polarizability turned to zero
with sufficient numerical accuracy.

\begin{table*}
\caption{\label{tab3} Wavelength (in vacuum) of selected transitions in Mg, Ca, Zn, Cd, Sr, Ba, Hg, Yb, Dy, Ho, and Er in nm.}
\begin{ruledtabular}
\begin{tabular}{llclc}
\multicolumn{1}{c}{Atom}& \multicolumn{1}{c}{Transition }& \multicolumn{1}{c}{Wavelength}& \multicolumn{1}{c}{Transition }&
\multicolumn{1}{c}{Wavelength}\\ \hline
 Mg & $3s^2~ ^1S_{0} - 3s3p~ ^1P_1$ & 285.3 & $3s^2\ ^1S_{0} - 3s3p\ ^3P_1$ & 457.2 \\
Ca  & $4s^2~ ^1S_{0} - 4s4p~ ^1P_1$ & 422.8 & $4s^2\ ^1S_{0} - 4s4p\ ^3P_1$ &  657.5\\
Sr  & $5s^2~ ^1S_{0} - 5s5p~ ^1P_1$ & 460.9 & $5s^2\ ^1S_{0} - 5s5p\ ^3P_1$ & 689.5 \\
Ba  & $6s^2~ ^1S_{0} - 6s6p~ ^1P_1$ & 553.7 & $6s^2\ ^1S_{0} - 6s6p\ ^3P_1$ & 791.4 \\
Zn  & $4s^2~ ^1S_{0} - 4s4p~ ^1P_1$ & 213.9 & $4s^2\ ^1S_{0} - 4s4p\ ^3P_1$ &  307.7\\
Cd  & $5s^2~ ^1S_{0} - 5s5p~ ^1P_1$ & 228.9 & $5s^2\ ^1S_{0} - 5s5p\ ^3P_1$ & 326.2 \\
Hg  & $6s^2~ ^1S_{0} - 6s6p~ ^1P_1$ & 184.9 & $6s^2\ ^1S_{0} - 6s6p\ ^3P_1$ & 253.7 \\
Yb  & $6s^2~ ^1S_{0} - 6s6p~ ^1P_1$ & 398.9 & $6s^2\ ^1S_{0} - 6s6p\ ^3P_1$ & 555.8 \\
Dy  & $4f^{10}6s^2\ ^5I_{8} - 4f^{10}(^5I_{8}) ~6s6p~(^1P_1)$ $J=9$ &421.3 & & \\
Er  & $4f^{12}6s^2\ ^3H_{6} - 4f^{11}(^3H_{6}) ~6s6p~ (^3P_1)$ $J=7$ &582.8 & & \\
Ho  & $4f^{11}6s^2\ ^4I_{15/2} - 4f^{11}(^4I_{15/2}) ~6s6p~(^3P_1)$ $J=17/2$ &598.5 & & \\
Ho  & $4f^{11}6s^2\ ^4I_{15/2} - 4f^{11}(^4I_{15/2}) ~6s6p~(^1P_1)$ $J=13/2$ &416.4 & & \\
\end{tabular}
 \end{ruledtabular}
\end{table*}

  We
illustrate the cancellation of all contributions to $5s$ Rb
polarizability at $\lambda_{\rm{zero}}$=423.0448~nm in
Table~\ref{tab1}. Since this wavelength is between $5s-5p_{3/2}$ and
$5s-6p_{1/2}$ resonances, the contributions of the $5p_j$ and $6p_j$
terms strongly dominate. However, the contribution from the core is
significant (11\% of the largest valence term).  This table shows
that $\lambda_{\rm{zero}}$ is located where the valence contribution
to the polarizability cancels the adjusted core contribution, a
feature that is common to all the cases treated here.  The zero
crossing point is in the close vicinity of the $5s-6p_{1/2}$
resonance owing to the relative size of the $5s-5p_j$ and $5s-6p_j$
reduced electric-dipole matrix elements given in the second column of
Table~\ref{tab1}. The $5s-6p$ matrix elements are more than an order
of magnitude smaller than the $5s-5p$ matrix elements. Since
polarizability contributions are proportional to the square of the
matrix element, the denominators of the $6p_j$ terms have to become
very small to cancel out the $5p$ contributions.

This magic-zero wavelength is illustrated in Fig.~\ref{fig1} where we
plot ground-state polarizability of Rb atom in a.u. in the vicinity
of the $5s-6p_j$ resonances. Another zero crossing point shown in the
figure is located between $5s-6p_{1/2}$ and $5s-6p_{3/2}$ resonances,
as expected.  The next magic-zero wavelength will be located close to
the $5s-7p_{1/2}$ resonance since the values of the matrix elements
continue to decrease with $n$.

\section{Results and Applications}~\label{sec3}

In Table~\ref{tab2}, we list the vacuum $\lambda_{\rm{zero}}$ wavelengths for alkali-metal atoms from Li to Cs.  For convenience of presentation, we
also list the resonant wavelength $\lambda_{\rm{res}}$ in vacuum in the relevant range of wavelengths. We order the lists of the resonant wavelengths
and $\lambda_{\rm{zero}}$ to indicate the respective placements of $\lambda_{\rm{zero}}$ and their distances from resonances. The resonant vacuum
wavelength values are obtained from energy levels from National Institute of Standards
 and Technology (NIST) database~\cite{NIST1} with the exception
of the $2s-2p_{1/2}$ and $2s-2p_{3/2}$ transition wavelengths for
$^6$Li and $^7$Li that are taken from recent measurements \cite{Li}.

Since alkali ground states have electric dipole transitions only to
$p$ states, their polarizabilities will cross zero only between two
$ns-n^{\prime}p$ resonances. We set the wavelength of the
$ns-(n+2)p_{1/2}$ resonance as a lower wavelength bound for our
search. The fine structure of the $(n+2)p$ level is sufficiently
small for all alkalis to make the zero point between
$ns-(n+2)p_{1/2}$ and $ns-(n+2)p_{3/2}$ relatively difficult to use
in practice, so we do not list it. We omit the $\lambda_{\rm{zero}}$
between $2s-3p_j$ resonances for the same reason. The wavelengths of
the next zero-crossing near the $ns-(n+3)p_{1/2}$ resonances are in
the ultraviolet, and not as readily accessible in most laboratories,
so we have not calculated them.  However, this would be a routine
matter for future work. There are no $\lambda_{\rm{zero}}$ at
wavelengths greater than those of the primary $ns-np_{1/2}$
resonances. Within these constraints, we have found four
$\lambda_{\rm{zero}}$ for Na, K, Rb, and Cs and three
$\lambda_{\rm{zero}}$ for Li, as shown in Table~\ref{tab1}.

The stated uncertainties in the $\lambda_{\rm{zero}}$ values are
taken to be the maximum difference between the central value and the
crossing of the $\alpha_{{0}}\pm\delta\alpha_{0}$ with zero, where
$\delta\alpha_{0}$ is the uncertainty in the ground state
polarizability value at that wavelength. The uncertainties in the
values of polarizabilities are obtained by adding uncertainties in
the individual polarizability contributions in quadrature.

We find small but significant differences in the first magic
wavelengths of $^6$Li and $^7$Li due to the isotope shift. These
values refer to the centers of gravity of all hyperfine states and do
not take into account the hyperfine structure.  Therefore, this
$\lambda_{\rm{zero}}$ and the corresponding $2s-2p_j$ resonance
wavelengths are listed separately. We verified that isotope shift of
the $2s-2p$ traditions in Li does not affect the next magic
wavelength, 324.18(6)nm, so we use NIST data for the other
transitions.
 We also investigated possible dependence of the first magic-zero wavelengths
 on the isotope shift for $^{39}$K, $^{40}$K, $^{41}$K and $^{85}$Rb, $^{87}$Rb.
  The D1 ($4s-4p_{1/2}$) and D2
($4s-4p_{3/2}$) line wavelengths for $^{39}$K, $^{40}$K, and $^{41}$K have been
measured using a femtosecond laser frequency comb by Falke {\it et
al.} \cite{falke}. We carry out three calculations of the first magic-zero
wavelength using D1, D2 wavelengths for the specific isotope in our
calculations. The resulting value for $^{39}$K and  $^{40}$K,  768.971(3)nm,
is the same as the value quoted in Table~\ref{tab2}.   The $^{41}$K
value is 768.970(3)nm, with the difference being well below our quoted uncertainty.
 The calculations of the first magic wavelength in Rb using D1 and
D2 frequencies  for $^{85}$Rb and  $^{87}$Rb listed in \cite{dline85,dline87}
 gave results identical to result from Table~\ref{tab2}, 790.034(7)nm
that was obtained using NIST data. We note that our values for the
first magic wavelengths are in good agreement with  LeBlanc and
Thywissen \cite{LeblancThywissen} calculations with the exception of
their value  for $^{40}$K.

The first magic-zero wavelength in Rb has been measured to be 789.85(1)nm in \cite{PhysRevLett.103.140401}.
 Some discrepancy with our result is most likely due to approximate linear polarization of the beam in
\cite{PhysRevLett.103.140401}. The difference is compatible with a shift in the magic zero wavelength
 caused by few percent spurious $\sigma^-$
polarization component \cite{com}.

Below, we identify two main applications of magic-zero wavelengths.
First, these wavelengths are advantageous  for  cooling of group-II
and other more complicated atoms,  by sympathetic cooling using an
accompanying   alkali atom.

Recently, group II atoms have been the subject of various experiments
and proposals in atomic clock research and quantum information. BEC
of $^{84}$Sr has been reported recently by two groups
\cite{CWC-1,sr-bec}. The element Yb has four boson and two fermion
isotopes, all of which have been cooled into the microkelvin range.
Several exciting new prospects for quantum information processing
with the ground state nuclear spin have recently been identified in
group II elements \cite{srq}. Also, Sr or Yb are useful for polarized
mixtures of fermions, or Bose-Fermi mixtures, where isotopic mixtures
can be studied.

More complex systems have become of interest in the development of
frequency standards and quantum information processing schemes. For
example, the rare earth holmium is a candidate for quantum
information applications \cite{ho1} due to its rich ground-state
hyperfine structure. Erbium has been a subject of recent experimental
work \cite{er1,er2}, stimulated by
 its possible use in a variety of
applications, including narrow linewidth laser cooling and spectroscopy, unique collision studies, and degenerate bosonic and fermionic gases with
long-range magnetic dipole coupling.

 Some species, particularly fermions,
 are difficult to cool by themselves due to unfavorable ultracold collisional dynamics.
  In such cases, it may be possible to use sympathetic cooling in a mixture of the target
   species and one of the alkalis, where the alkali-metal atom is cooled directly by standard
techniques.  This has recently been demonstrated in Yb:Rb  mixtures
\cite{CWC-10a}. Use of $\lambda_{\rm{zero}}$ trap wavelengths could
allow one to release alkali atoms after the target atoms of the other
species are sufficiently cold, in a hybrid trap configuration that
combines optical and magnetic traps or bichromatic optical traps. If
the final trap configuration utilizes a $\lambda_{\rm{zero}}$
wavelength, strong trapping of the target atom is possible while
alkali atoms will be released by turning off its separate trapping
potential. Since placement of the resonances varies significantly
among the alkali-metal atoms, a wide range of $\lambda_{\rm{zero}}$
is available as shown in Table~\ref{tab3}.

We list the resonant wavelengths  for  variety of atomic systems  in Table~\ref{tab3}.
For consistency with the other tables, we list vacuum
wavelengths obtained from the NIST energy levels database~\cite{NIST2}.
Comparing Tables~\ref{tab2} and \ref{tab3} yields many instances of
resonant transitions that are very close to $\lambda_{\rm{zero}}$. Here are
 few of the very  close cases: Mg~285.3  - Na~285.6, Sr~460.9 - Cs~460.2,
Dy~421.3 - Rb~421.1, Ho~598.5 - Na~589.6.

Magic-zero wavelength laser light may be also useful in three-species cooling
 schemes such as reported in Ref.~\cite{three} by allowing easy release
of one of the species from the trap. The work \cite{three} demonstrated that
 the efficiency of sympathetic cooling of the $^6$Li gas by $^{87}$Rb
was increased by the presence of $^{40}$K through catalytic cooling.

Measurements of the magic-zero wavelengths may be used as
high-precision benchmark tests of theory and determination of the
excited-state matrix elements that are difficult to measure by other
methods. Matrix elements of  $ns-n^{\prime}p$ transitions of
alkali-metal atoms, where $ns$ is the ground state, are difficult to
calculate accurately owing to large correlation corrections and small
values of the final numbers. Experimental measurements of the
$\lambda_{\rm_{zero}}$ predicted in this work will serve an an
excellent benchmark test of the all-order calculations. Moreover, it
will be possible to combine these measurements with theoretical
calculations to infer the values of these small matrix elements. Only
one high-precision measurement of such matrix elements ($6s-7p_j$
transitions in Cs) has been carried out to date ~\cite{beta}.

\section{conclusion}~\label{sec4}
In summary, we calculate magic-zero wavelengths in alkali-metal atoms from
 Li to Cs and estimate their uncertainties. Applications of these magic
wavelengths to sympathetic cooling of group-II and other more
complicated atoms with alkalis are discussed. Special cases where
these wavelengths coincide with strong resonance transition in
group-II atoms, Yb, Dy, Ho, and Er are identified. Measurements of
the magic-zero wavelengths for benchmark tests of theory and
experiment are proposed.

This research was performed under the sponsorship of the US
Department of Commerce, National Institute of Standards and
Technology, and was supported by the National Science Foundation
under Physics Frontiers Center Grant PHY-0822671. This work was
performed in part under the sponsorship of the Department of Science
and Technology, India. We thank Joseph Reader and Craig Sansonetti
for helpful discussions.

redpajama_set_name: RedPajamaArXiv


text:
Light Scattering Technology for Early Cancer Detection
A novel way to see early neoplasms with "angle-resolved low coherence interferometry" (a/LCI) technology, from researchers at Duke University's Pratt School of Engineering:
Previous studies by Wax's team used a/LCI to identify pre-cancer in animal tissue. Pre-cancerous cells are characterized by an enlarged nucleus, the structure that houses the cell's genetic material. It is such cellular changes that pathologists rely on to identify cancer in biopsied tissue, Wax said. [Adam Wax is a professor of biomedical engineering at Pratt -ed.]
The a/LCI device emits light that scatters when it hits the cell nucleus. To enable a/LCI to be used as a diagnostic technology, the researchers developed a model of how light is scattered by the nucleus of healthy cells versus cancerous ones.
"What really sets a/LCI apart is its ability to focus on light scattered from a single cell layer," Wax said.
The device is also fast, he added. While early versions of the technology required up to 30 minutes to scan a 1 millimeter point, further development led to a "Fourier-domain" device (faLCI) that captures the same information in a fraction of a second, Wax said.
The researchers now have devised an endoscopic fiber bundle probe incorporated into the faLCI system. Endoscopes are thin, flexible tools used to examine the inner lining of the esophagus. In laboratory tests, the endoscopic faLCI probe could precisely and accurately determine the size of tiny polystyrene beads in solution, the team found. The beads represented a clinically relevant size range comparable to the dimensions of nuclei found in normal to cancerous tissue.

redpajama_set_name: RedPajamaCommonCrawl


text:
Kondor Dreidecker
Kondor - W 1 / W 2 - 1915 - Германия <– –> Kondor - B.I - 1918 - Германия
KONDOR DREIDECKER Germany
In the summer of 1917, the Kondor Flugzeugwerke of Essen was joined by Walter Rethel and Paul G Ehrhardt, formerly with LVG, to initiate a series of original designs. The company had previously been concerned primarily with licence manufacture of the Albatros B II and B IIa. The first original design produced by Rethel and Ehrhardt was a single-seat fighter triplane (dreidecker) which entered flight test in October 1917. Initial trials with an unrecorded engine type evidently revealed performance shortcomings as an Idflieg report of the same month refers to the aircraft being re-engined by Kondor with a geared six-cylinder water-cooled Mercedes D III of 160 hp. Testing of the triplane fighter was terminated as a result of severe vibration problems, the fuselage, lower wing assembly and tail subsequently being utilised by the D 7 biplane. No illustrations or data relating to the Kondor triplane have survived.
Нет фотографий


Other interests: F1 cars, did go-carting in his early days, likes speed sports: skiing, etc..
Elena from 365 Freelance: Attila, thank you for taking the time to share your views with us. What is your ideal role?
Attila: I prefer working for end-users as I like long-term engagement with the same company. This is what I've done in the past but I am also open to working for a partner as well as this way I will meet with new companies all the time. This would be a new challenge and I am a fast learner.
What I like best is to oversee the whole project and engage with the business side. In my experience, what works really well is to gather the client requirements by spending some time with end-users and doing their job/shadowing them so I could understand their jobs, process flow, problems, etc.. Then once I build this knowledge, I can scope the project and develop the required functionality.
I am currently based in Hungary but can work anywhere in EU. Unfortunately, we have limited opportunities with AX here working on an end-user side. There just aren't that many large and complex AX implementations. This is the reason I am looking for opportunities abroad where I know there is a shortage for resources.
Elena: You worked directly for a Dynamics AX end-user for 10 years. Tell me more about your role and responsibilities?
Attila: In the beginning, 2004 I was hired for the implementation of AX v3. This big international company needed someone in Hungary to implement it. In the beginning, I was more involved in the programmatic side and getting the budget approved. Then we hired a second consultant in the team and was able to concentrate on the solution, understanding the changes in the business and adjusting/expanding our solution accordingly. For example, there were legislation changes; this required us to update AX. Other things that needed a lot of attention were integrations to external software. I was also involved in developing lots of additional functionality and modules (Truck Weighting Scale module, Plate ID reader and gate control system, bank card reader system, etc..). I ran 2 very interesting projects – Digital Delivery Notes and Invoicing by RFID authentication. I also coordinated the work with the 2 partners with involved in both Hungary and Czech Republic.
Elena: You mentioned previously that you are constantly looking for new challenges and new ways of looking at problem solving. Tell me more about the Creative Problem Solving course you graduated at the College of Design, University of Minnesota?
Attila: Yes, I like to challenge my own thinking. I did a couple of management courses. It is great to do something different outside of your comfort zone. We often think about the problematic consequences and say "Yes but…", how about we turn this around and think about the "Yes and…" solution. I then try to apply this at work – not only focussing on the problem and the traditional solution. In a way, it is good to step back and start think like a child and not being limited by how we always do things.
Attila: 365 Freelance helps open the resource market. It is all about supply and demand – there are not enough consultants in some developed markets; there is a supply of experts in others so your platform is a great solution to this capacity issue.
Elena: Thank you so much, Attila! I really enjoyed talking to you.


text:
Сарајевска пивара је основана 1864. године, њено седиште се налази у Сарајеву. Њен најпознатији производ је Сарајевско пиво, а осим пива бави се производњом безалкохолних пића и флаширане воде.

Производња
 Сарајевска пивара производи класично пиво, као и радлер пиво са укусом лимуна и безалкохолно пиво.
 Осим пива Сарајевска пивара производи флаширану воду "BH2O", и "Сарајевску воду".
 Сарајевска пивара производи "Swity" сокове
 Сарајевска пивара и Пепси имају склопљен уговор о пуњењу Пепси коле

Референце

Пиваре у Босни и Херцеговини
Предузећа из Сарајева
Општина Стари град (Сарајево)

redpajama_set_name: RedPajamaWikipedia


There are no words. And yet so many have been written.
Many friends of ours have lost friends, classmates and family. Our thoughts and prayers are with them; all those that I have met in the last weeks, desperately searching for loved ones and some still hoping – against hope – and all of those men, women and children who have lost their lives.
What happened has been, and is, unbearable.
But it is true that the community, people in Notting Hill and North Kensington ( I consider it to be one and the same) – from all backgrounds and walks of life – have shown an incredible level of support and kindness to each other. And I believe that we are all determined in our own different ways to continue with that support wherever it is needed or wanted, and, whatever our politics, do everything in our power to ensure that this cannot happen again.
There will be prosecutions and an inquiry into how and why this fire spread so quickly and killed so many innocent people. And all those affected must be allowed to have their say. This has been promised and we as a community will continue to insist on this. Those of us not directly involved are still neighbours, colleagues and fellow parents on the school run of the people who are. The donations, the fundraising, the numbers of volunteers all show how deeply people here care – and I am proud to be part of this warm-hearted community. Of course many from outside the area have also provided huge amounts of help.
The last thing we need now though is people who do not live here, using this tragedy for their own ends, with little concern about the long term damage they are doing , trying to create division and turn people's terrible grief and understandable anger into hatred.
Most people affected seem to want to continue to live in this community – and they will need our support in all kinds or ways for years to come and we will be here for them.


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text:
You are here:Home » Save On Foods Touchdown to Win 1 Million Dollars & Groceries For a Year
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text:
Lite Media
Islamic State News
HomeLatest NewsSyria Latest NewsHOMSSyria: Rebels evacuation form Homs' al-Waer dalayed
Syria: Rebels evacuation form Homs' al-Waer dalayed
March 26, 2017 Ahmed Rashed HOMS, Syria Latest News
Civilians displaced from al-Waer, Homs' last Rebel-held district
The second phase of an evacuation of Syrian rebels and civilians from the last rebel-held area of Homs city has been delayed until Monday, according to Homs governor, after the first evacuation stage was performed last week.
Last week, the negotiators from al-Waer besieged area had signed an agreement for rebel factions and their families to surrender and leave Homs city.
The deal follows other agreements that were never fully implemented between the government and rebel groups in al-Waer, their last bastion in Homs, which has been pounded by air strikes in recent weeks.
Both sides signed the deal according to which opposition fighters and their families who choose not to accept living under Assad regime's control, will be forcibly displaced and head to Idlib, or Jarablus in northern Syria.
The agreement underlines Assad regime's upper hand in the war, as more rebel fighters were forced to leave areas they have defended for years in deals that amount to negotiated withdrawals to other parts of the country
Homs, the country's third-largest city, was once the center of the uprising against Bashar al-Assad.
Throughout the Syrian crisis, wide parts of the city were held by rebels but state forces eventually regained control of all areas except for Waer. The rebel fighters withdrew from old Homs in 2014 after two years of intensive bombardment, that left more than the third of Homs destroyed.
Waer is home to about 75,000 people and has been under a government siege since 2013, triggering shortages of medicine and occasionally food.
The UN has not been able to deliver much needed humanitarian aid to the area since September 2016.
Civilians displaced from al-Waer, Homs' last Rebel-held district
First wave of civilians evacuated
On March 19, green government buses ferried the fighters, who were carrying assault rifles, and their families from the northern Al Waer neighborhood to Homs' western entrance, where they disembarked and had some of their bags searched under the supervision of Syrian and Russian military police.
The men, women and children, most of them carrying their belongings in suitcases and plastic bags, then boarded white buses that were to take them to the northern rebel-held town of Jarablous on the border with Turkey. The evacuees were assisted by Syrian Arab Red Crescent members as they put their belongings in the buses.
Talal Barazi, the Homs governor, told Reuters news agency that about 1,500 people would depart for Aleppo's countryside on Saturday, including at least 400 fighters.
Russian and Syrian forces were overseeing the evacuation, and the full departure of rebels from Al Waer would take about six weeks, he said.
"The preparations and the reality on the ground indicate that things will go well," Barazi said.
Damascus describes such deals as a good way of bringing the country closer to peace after six years of conflict. But the opposition describes them as a tactic of forcibly displacing people who oppose Assad after years of bombardment and siege.
"There is a deliberate strategy from the Syrian government in terms of retaking some of these areas is that they lay a siege on the area preventing all kinds of supplies from getting in, including food, medical supplies etc and then they indiscriminately attack these areas," the deputy director of emergencies at Human Rights Watch, Ole Solvang, said.
"Aleppo was perhaps the most egregious example of that but we've seen it in many other places as well, so one of the major concerns HRW has is about these deals and the way they come about."
Thanks to the world!Forced displacement,war crime
First group of convoys of evacuation left al Wa'er neigh/#Homs to Jarablus city in #Aleppo pic.twitter.com/EcJNGQQ9JZ
— Raed Al Saleh (@RaedAlSaleh3) March 18, 2017
Assad enforced displacement under Int'l view: #Homs #Daraya #Moademiyeh, #Aleppo, #WBarada. #RevolutionWillWin pic.twitter.com/yzwWqzpZJe
— Zolal Habibi (@Ashrafi4ever) March 18, 2017
Read more: Farewell, Civilians displaced from Homs' last Rebel-held district
The second stage delayed
Homs Province governor Talal Barazi was cited by city officials as saying the operation would continue on Monday after having earlier said it would go ahead as planned on Saturday.
The war monitor said the evacuation was being postponed because of the fighting that began on Tuesday in Hama province between rebels and the army.
Barazi said there was communication with other rebel-held areas north of Homs city to reach similar deals, including the towns of al-Rastan and Talbiseh.
"We are optimistic that the full exit of armed (fighters) from this district will pave the way for other reconciliations and settlements," he said.
The Syrian Observatory for Human Rights, a Britain-based war monitor, said the civilians will be evacuated to the Jarablus area held by Turkey-backed rebels in the northern Aleppo countryside.
Once completed, it would mark the biggest evacuation during the war out of one Syrian district, which is home to about 40,000 civilians and more than 2,500 fighters, the monitoring group said.
"It's because there is zero trust in Assad's government. That's why the numbers are high," said the head of the Homs Media Center, run by opposition activists. "For years, it has besieged us…and bombed people's homes."
Many did not want to stay out of fear of arrest, and around 15,000 people had signed up to evacuate so far, he said.
"People are going to live in tents, in refugee camps," the activist said, adding that he also planned to leave in the coming weeks. "They are willing to leave their homes, their land, towards the unknown."
Local "reconciliation" agreements are "the solution"
When asked about the solution he imagines, Assad said that it involves fighting who he called as terrorists, while seeking dialogue through "reconciliation agreements" with those who decide to return to the "government's amnesty."
"You need to have two parallel ways: the first one is to fight the terrorists, and this is our duty as government, to defend the Syrians and use any means in order to destroy the terrorists who've been killing and destroying in Syria. The second one is to make a dialogue. This dialogue has many different aspects" Assad said.
"You have the political part, which is related to the future of Syria; what political system do you need, what kind? It doesn't matter which one, it depends on the Syrians, and they're going to have referendum about what they want. The second part is to try to bring many of those people who were affiliated to the terrorists or who committed any terrorist acts to go back to their normality and lay down their armaments and to live normal life in return for amnesty that has been offered by the government, and we've been going in that direction for three years, and it worked very well," Assad added.
"So, actually, if you want to talk about the real political solution since the beginning of the crisis, of the war on Syria, till this moment, the only solution was those reconciliations between the government and the different militants in Syria, many of them joined the government now, and they are fighting with the government. Some of them laid down their."
Assad regime forces, helped by Russian air power and Iran-backed Shiite militias, has steadily ended armed opposition influence in the remaining pockets of resistance around the capital, in addition to many areas in Syria, using a series of army offensives and evacuation agreements, after years of siege, starvation, and daily bombing.
Assad regime describes the evacuation deals as "reconciliation" or "settlement agreements", but rebels say they involve the forcible displacement of whole communities from opposition areas after years of siege and bombardment.
The Syrian crisis began as a peaceful demonstration against the injustice in Syria. Assad regime used to fire power and violence against the civilians and led to armed resistance. 450.000 Syrians lost their lives in the past five years according to UN estimates, and more than 12 million have lost their homes.
al-Waer
al-Waer agreement
Assad regime crimes
Syria besieged areas
Syrian rebels
Syria, Palestine, Iran to be key issues at Arab Summit Wednesday
Syria: De Mistura calls to salvage ceasefire, No big expectations
Syria Latest News
Turkey sends military equipment to troops near Syrian border
August 26, 2017 Ahmed Rashed Syria Latest News, Turkey Latest News
The shipment included storm howitzer artillery and M114s that were sent to the Turkish district of Elbeyli on the Turkey-Syria border A military shipment of storm howitzer artillery and M114s were transported to Turkey's Elbeyli [ More … ]
Canada: Did western intelligence cooperate with Assad regime before the crisis?
March 19, 2017 Ahmed Rashed Syria Latest News
Canada on Friday formally apologized to three Canadian men of Arab descent who said they had been tortured in Syria and blamed Canadian secret services for their ordeal, shading the light on the cooperation between [ More … ]
Syria: Assad regime attacks Hama with chlorine gas
October 26, 2016 Ahmed Rashed Syria Latest News
A woman and a child were killed and twenty civilians, including children, were treated for asphyxiation on Tuesday evening following what is believed to be a chlorine gas attack carried out by the Assad regime near [ More … ]
Turkey and France in a new attempt to de-escalate tensions
Turkey Latest News
France investigates a UAE loan to a far-right party
Uae Latest News
Turkey cautiously welcomes UAE positive statement on relations
Renowned Egyptian musician recounts his '5-star' prison conditions with Mubarak's sons
Egypt Latest News
Ethiopia, Egypt and Sudan negotiations on Ethiopian dam break down
Copyright © 2016 | Middle East Observer


text:
Archives For martyrdom
Our radical, often-martyred ancestors
ib2newseditor — November 30, 2017
Editor's note: The 500th anniversary of the Protestant Reformation collided with the reality that there are still martyrs today. Ron F. Hale, a former IBSA director of evangelism, examines the Anabaptist movement that catalyzed a second Reformation of sorts, and gives Baptists another piece of their spiritual heritage.
Dr. Balthasar Hübmaier of Friedberg
On the heels of the Reformation came the Radical Reformers, who questioned everything that didn't have scriptural authority. Infant baptism and the observance of Mass caused the greatest angst for Anabaptists. And like shooting stars against the backdrop of the Dark Ages, many forces came forth to snuff out these bright lights.
Sixteenth-century Anabaptists were put to death by state-church authorities as they launched the most revolutionary act of the Reformation. Thousands died—burned at the stake, drowned in the rivers of Europe, run through with swords, or starved in putrid prisons.
The wheels of this revolution began turning as young intellectuals gathered around the Swiss reformer Ulrich Zwingli in serious study of the Greek New Testament. Some of the young theologians became convinced that Zwingli and others lacked sufficient reforms in purifying the church and recovering New Testament practices.
In all this Reformation talk, don't forget the Anabaptists.
On the evening of Jan. 21, 1525, several men who became known as the Swiss Brethren met without Zwingli in the home of Felix Manz in Zürich. After earnest prayer, George Blaurock (a Catholic priest) begged Conrad Grebel to baptize him with true Christian baptism upon his confession of faith in Jesus.
After Blaurock received his own baptism, he baptized the others as they came humbly, promising God and each other to live separated from the world and to preach the gospel. The next morning, these young men hit the streets preaching and baptizing new believers as they boldly lived out the Great Commission of Jesus.
Thousands executed
The Zurich council vigorously suppressed this movement and established an ordinance that the teaching or preaching of Anabaptism was against the law. The radicals were derisively labeled "re-baptizers."
Withholding your baby from the baptism font or re-baptizing citizens upon their profession of faith became illegal. Sam Storms, a pastor and former professor at Wheaton College, indicates that more than 5,000 Anabaptists were executed in Switzerland by 1535.
Felix Manz was the first person to be executed from the tiny group that met in his home on that historic night. With the support of Zwingli, Manz was taken from the Wallenberg prison tower on a cold winter day. He was taken to the fish market by the Limmat River to be read his death sentence. He was forced into a boat and escorted to a little hut in the middle of the river by a pastor and his executioner. Felix Manz was shackled and pulled from the top of the fishing hut, disappearing into his watery grave.
George Blaurock, the first to be baptized that fateful night, was later burned at the stake on Sept. 6, 1529, in Klassen (now Austria), after winning and baptizing hundreds to Christ.
The movement continues
The Anabaptist movement would grow to be important beyond the issues of Mass and infant baptism. It became a new paradigm of doing church. The old parish concept of every baby being baptized as a new member of the church was being replaced by a "free church" model where only those mature enough to confess Christ as Lord and follow him in believer's baptism would be regenerate members of the local church. These members would observe the Lord's Supper as a memorial meal without sacramental and medieval trappings.
Michael Sattler became important to the movement as the writer of the Seven Articles, the first Anabaptist declaration of faith. The articles, now referred to as the Schleitheim Confession of Faith, became widely circulated and accepted. However, Sattler became a marked man.
On May 20, 1527, he was tortured prior to being burned at the stake. A part of his tongue was cut out, his flesh was burned with red-hot tongs. His faithful wife, Margaretha, was drowned eight days later.
If biblical authority was the major issue between Magisterial Reformers (those associated with Martin Luther and John Calvin) and the Roman Catholics, believers' baptism became that between the Anabaptists and the Magisterial Reformers. Anabaptist historian William Estep said, "Believers' baptism was for the Anabaptists the logical implementation of the Reformation principle of sola Scriptura."
Dr. Balthasar Hübmaier of Friedberg became the ablest defender of the Anabaptist position on believers-only baptism in the 16th century. Estep called him the Simon Peter of early Anabaptists.
Hübmaier saw that the regenerate nature of the church presupposes a certain degree of maturity, personal faith, and volition. Since infants cannot confess sins and believe, then infant baptism had to be dismissed as unscriptural. Since neither John [the Baptist], Jesus, nor the apostles taught or practiced infant baptism, Hübmaier never tired of denouncing this practice. He saw no saving power in church water. Nor could he find any New Testament evidence of a godfather or spiritual sponsor being able to believe for the infant undergoing baptism.
Hübmaier and his wife were martyred in Vienna in 1528. Baptists owe a debt of gratitude to them and other Anabaptists who stood firmly—even unto death—on Scripture, rather than church tradition, as the final authority on matters of faith and practice.
Ron F. Hale has served as a Southern Baptist pastor, denominational leader, and religion writer. He currently ministers on the pastoral staff of a local SBC congregation in his hometown of Jackson, Tenn.
In Commentary	Anabaptists, Balthasar Hubmaier, baptism, John Calvin, Martin Luther, martyrdom, Reformation@500, Sola Scriptura
Postmodern Martyrs
eric4ibsa — March 16, 2015
Artwork by Kerry Jackson
The call to live–and die–for Christ in the age of terrorism. Are we ready?
By Eric Reed
THE WORLD | The scene is chilling, even a month after it happened: 21 men in orange jumpsuits are led along a beach in Libya by masked men holding knives over their heads, then to their throats. The men in orange are captives, Egyptians working in Libya; more important, they are Christians, Coptic Christians, with up to 20 million adherents, whose branch of the faith dates to the third century AD.
The masked men in black are ISIS rebels, part of the radical faction of Islamic extremists marching across Iran, Iraq and Syria, and taking control of towns and regions ceded by Al-Qaida in the battle with American and indigenous forces over the past decade.
The men in orange are forced to kneel, ordered to recant their faith in Jesus Christ, and when they refuse, they are pushed face down into the sand and the knife blades are placed against their throats.
Mercifully, the video ends there for American television viewers, but for the men in orange there is no mercy.
They are beheaded.
And we, believers watching in disbelief, are little comforted by the great distance between us and the bloodstained beach as we come to the twin realizations that ISIS is on the move with a brutality that the world has not seen in a long time, and we have entered a new era of martyrdom.
A growing threat here?
Sixteen past presidents of the Southern Baptist Convention joined current president Ronnie Floyd in sending an open letter to President Obama, urging the U.S. to "take the necessary actions now" against the ISIS terrorists. They called ISIS "a continuing threat to world peace in a way unknown to us since the Nazis of World War II…"
The March 1 letter came two weeks after the beheading of the Egyptian Christians, and a week after the report that ISIS captured more than 200 Assyrian Christians, including women, children and elderly people. "People are frightened, people are concerned," concurred Frank Page, SBC Executive Committee President, who said he is often asked about the threat of ISIS. Page's signature was one of the 17 on the letter.
The concern Page cites is not only about the abominable acts by Islamic extremists abroad—killing a young, female American aid worker, burning a Jordanian pilot alive—it's about the growing threat on our own shores as young adults, Americans included, are wooed, recruited, and radicalized via the Internet to join ISIS forces in the Middle East. And if not there, to carry out terrorist acts here.
A Somali militant group, al-Shabab, released a video in late February calling for Muslims to attack malls in Britain, Canada, and the Mall of America in Bloomington, Minn. "Hasten to heaven," the video advised, by disrupting the safety of "disbelievers" (meaning non-Muslims) "in their own land."
U.S. Homeland Security Secretary Jeh Johnson said such groups are "relying more and more on independent actors to become inspired" and "attack on their own." The threats should be taken seriously.
If this seems like an exaggeration of the growing threat, one only needs to consider the Boston Marathon bombing in April 2013. On trial now is Dzhokhar Tsarnaev, charged with the attack that killed three people and injured 260.
"The defendant's goal that day was to maim and kill as many victims as possible," said Assistant U.S. Attorney William Weinreb during opening arguments. "He believed that he was a soldier in a holy war against Americans. He believed he had taken a step toward reaching paradise. That was his motive for committing these crimes."
Tsarnaev, with his older brother, was said to be "self-radicalized," not identifying with a specific terrorist group, but with extremist Islamist beliefs and the wars in Iraq and Syria.
It is those new radicals who are hardest to identify and who may pose the greatest threat in the West. What seemed distant and improbable now feels near and possible. And the threat causes Christians to ask, are we ready?
Wish we'd all been ready
Since we first saw the 1972 film "A Distant Thunder," many evangelicals have expected their faith would bring them to this moment. Recall the Christian teenagers, converted after they were "left behind" in the rapture, are clad in white. They are led to some secret place to face their death, and the film cuts from their horrified faces to their means of execution, the gleaming blade of a guillotine.
Didn't we all gasp at that point? Naïve believers in the 1970s hardly imagined their deaths could be worse, but the untelevised portions of the ISIS video say otherwise.
Pastor Robert Jeffress of First Baptist Church of Dallas summarized the terrorist threat in an interview with Fox News: "These Islamists will not rest until they've exterminated every Jew and every Christian from the face of the earth, and if you think that is hyperbole, just listen to what they said on that Libyan beach after they butchered those 21 Christians."
And the Pew Research Center reports threats against Christians worldwide are on the rise. In fact, "…Christians are at the top of the list," researcher Peter Henne said. "Christians were harassed in 102 countries when you look at either governments or social groups." Pew also reports an increase in anti-Semitism. "Overall we found that Jews are harassed in 77 countries around the world when you look at both government and social harassments together….It's also a seven-year high of the number of countries in which Jews were harassed." Pew's example: Europe, where Jews were harassed in 34 of the region's 45 countries.
We do not desire to traffic in fear, but the possibility of martyrdom on our own shores is increasingly real; and it forces us to consider what we may not have given serious thought in a long time: It could be us. It could be me.
And that demands a new theology of martyrdom.
The end of symbolic martyrdom
When Jesus called his followers to take up the cross, he was issuing a call to follow him, even unto death. Many have done so. The apostles died tragically at the hands of oppressors. Scripture reports that James the son of Zebedee was executed by Herod. The deaths of others were told by early church historians and tradition:
Andrew was crucified.
Peter was crucified upside down.
James the son of Alphaeus was stoned, then clubbed to death.
Thomas was run through with spears.
And Paul, it is believed, was beheaded in Rome, to name a few.
Jesus, the Savior-Martyr, was followed willingly and courageously by many across the centuries. And in the 20th century, we have the witness of Lutheran pastor Dietrich Bonhoeffer, who was hanged in a Nazi concentration camp for standing against Hitler's Third Reich. But somehow, his forbearance in the face of a monolithic, systemic, political evil 70 years ago seems different from what we have seen recently.
We ask, is the death of these Copts the harbinger of the ordinary-believer martyr?
Certainly we are witnessing the death of the symbolic martyr, where the faithful Christian is willing to sacrifice social approval or career advancement in the name of the gospel; where the dutiful believer picks up his cross and marches to the marketplace, willing to suffer the slings and arrows of foulmouthed and hedonistic co-workers—but keeps his life. After all, Paul told Timothy that "in the last days, perilous times will come" and those who desire to live a godly life will be persecuted (2 Timothy 3:1, 12).
Many Christians have assumed the call to suffer for Christ meant the loss of religious liberties, particularly in the West. But now, we're talking literal martyrdom. Since the murders of 12 students at Columbine High School in 1999, including Cassie Bernall and Rachel Scott who were credited with holding fast to their faith at gunpoint, martyrdom in the postmodern era has had a new face.
Today, the Christian faith really is a matter of life and death in ISIS-held regions of the Middle East, as several missions groups report the killing of indigenous children as their Christian parents refuse to deny Jesus.
And in the rest of the world, believers are challenged to take up the cross, not only in the spiritual sense, but in very real ways, here and now. Paul's words in Philippians, "For me to live is Christ, and to die is gain," take on stark new meaning.
So does Romans 8: "Because of You we are being put to death all day long…" And the need to hold to the promise written by a man facing his own execution: "For I am persuaded that not even death or life…hostile powers…or any other created thing will have the power to separate us from the love of God that is in Christ Jesus our Lord!"
In the meantime, we pray.
"We ought, indeed, to pray for the gospel to go forward, and that there might be a new Saul of Tarsus turned away from murdering to gospel witness," wrote Russell Moore, president of the SBC's Ethics and Religious Liberty Commission.
"At the same time, we ought to pray, with the martyrs in heaven, for justice against those who do such wickedness. Praying for the military defeat of our enemies, and that they might turn to Christ, these are not contradictory prayers because salvation doesn't mean turning an eye away from justice."
Additional reporting by Lisa Sergent
Look for more on this topic in the newest issue of the Illinois Baptist, online at http://ibonline.IBSA.org.
In News	Christians, Jesus, martyrdom, martyrs, persecution, Suffering
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Supporters of marijuana legalization in Vermont are in mourning after the state's House of Representatives rejected an adult-use cannabis bill their Senate colleagues approved in March.
The lopsided 121-28 vote means Vermont, for now, will not become the first state to pass legalization through its legislature.
It's also the latest sign that legalization proponents face growing opposition in New England because of the region's opiate abuse problem.
According to the Associated Press, some Vermont House members said they favored legalization. But they opposed the Senate measure because its proposed system of licensing and taxing growers and retailers – and barring home cultivation – was too commercial of an approach for a state sometimes known as the Socialist Republic of Vermont.
The House also rejected a Republican bill to put recreational legalization on a nonbinding statewide referendum on the August primary ballot.
I'm glad that the house measure failed. There needs to be a real legalization for all adults, not just the wealthy. There's a cottage industry that is in place and they are the most qualified to grow for Vermonters who don't want to or can't grow their own.
The States should all just step off! Legalize and let it fly, we've been smoking for over fifty (50) years and have a system already in place! Do we really need any intervention other than medical do's/don'ts? Keep it simple, stupid!!!


text:
Fittleworth Rifle Club
Downloads & Forms.
Gun activists get say at UN summit
By fittleworthrifleclub July 7, 2006
The gun industry and shooting enthusiasts fired back at the anti-gun lobby yesterday at an international conference on illicit weapons, saying any global restrictions will affect sport hunters.
"If you do something at this conference that impacts even a few hunters, sport shooters or legal firearms owners, you do it to all of us," said James Fulmer, a fan of antique muzzleloading rifles from Friendship, Ind., at the midpoint of the United Nations Small Arms Review Conference.
The two-week conference is meant to take stock of the global efforts to curb the trade on illegal arms and draft a plan of action for the future.
This year's conference, which coincides with the Fourth of July holiday, attracted the ire of tens of thousands of American gun owners, who were mobilized by the National Rifle Association to protest what they see as a global effort to disarm U.S. civilians.
The conference is not looking at legal civilian ownership, but is examining ways to limit the flood of weapons into unstable regions.
In a wide-ranging but ill-attended morning session, speakers representing gun manufacturers, weapons brokers, antique-firearms enthusiasts and big-game hunters stressed that misuse is the problem, and not the gun itself.
"A firearm is a tool, a very simple tool that dates back to the 12th century," said Thomas Mason, a frequent gun lobbyist who represented the Sporting Arms and Ammunition Manufacturers' Institute at the conference. "Like any tool, it can be used for great good or great harm," he said.
The alliance of two dozen manufacturers has embraced marking and tracing of weapons but is opposed to similar tracking for ammunition, as is commonly proposed on the sidelines of the conference. As many as 14 billion rounds of ammunition are produced each year, and manufacturers note that it would be technically and logistically impossible to mark each bullet.
Many of the morning speakers protested what they see as an unfair focus on legal or civilian arms, and rejected international efforts to mark ammunition or expand national jurisdiction over global trade.
Mark Barnes, a registered firearms broker, warned governments against enacting broad jurisdiction that would impede a dealer's ability to make international sales.
He urged countries to establish effective import and export laws before they attempt to draft international guidelines.
International arms brokers are considered by nations and gun foes to be the weak link in the chain, the place where legally manufactured or owned firearms are sold or traded to groups without proper verification of end users.
"Our membership is concerned with the enactment of overly broad international regulatory programs that unnecessarily and adversely impact the legal trade in small arms and light weapons instead of focusing on reducing the illicit trade," Mr. Barnes said on behalf of Firearms Importers Roundtable Trade Group.
Rick Parsons, representing the Washington-based Safari Club International, made one of the most ambitious speeches of the morning session, in which he linked international game hunting with the U.N. Millennium Development Goals.
"I believe that every person in this room will acknowledge that some of the world's poorest countries are also the most biodiversity rich," Mr. Parsons said. "The trade and use of biodiversity generates revenues that fund basic needs like farming equipment, education, medical clinics, roads, food-storage facilities and electricity."
Carefully administered programs allow foreign sport shooters the opportunity to hunt game, while fees and licenses generate money for local communities, he noted, citing Zimbabwe, Namibia, Zambia and Botswana as examples.
Mr. Parsons also called on authorities to allow foreign hunters to more easily travel internationally with their legally registered weapons.
"I respectfully request that legitimate firearm owners, hunters and competition shooters [are acknowledged as] equal and recognized stakeholders in efforts against illicit trafficking in small arms," he said.
Posted in United Nations News


We've just bought our bike mad 5-year-old bike a new helmet and it's the coolest helmet ever!
It's made by Kiddimoto, a family-owned British company based in Somerset, who specialise in wooden balance bikes.
Our son's old Specialized cycling helmet has long been outgrown and has been perching uselessly on our son's head for a while. But he thinks wearing a helmet to cycle and ride his scooter is 'cool' (long may that continue!), so we wanted to get him something really stylish - just bigger.
It's a BMX-style helmet with air vents in (very visible) bright red. But the clincher is the design, with painted on goggles, which look absolutely fantastic!
Having measured his head, he was right at the top of the 'small', so we bought a 'medium', which currently looks huge, but there's lots of room to grow (the helmet fits my wife too!).
The best price we found was £21.99 from Chain Reaction Cycles.
The helmet is very solidly made and there's loads of padding and adjustment. Our son gets lots of smiles from people when he wears it.
And if it encourages kids to wear a helmet, who can argue...?
This is a great of gear review coolest kids cycle.
A cycle helmet is rather well designed plus you will find an awful lot of foam plus resetting. All of our youngster may get numerous enjoyment out of people today if your dog might wear them.
Wonderful!! Even me too really love an electric bike.
Wonderful helmets.This is really looks so cool. Definitely I will buy one for my kid asap.Thanks for sharing this good review.
This is so great.Thank you for writing it.I looks very cool for kids.Thanks for sharing this good review with us.
Smart and safe helmet. My little one normally gets annoyed with her helmet but hasnt complained about this one tickling as the fit is great.
Wow, this kids cycle is looking very nice. I love mountain bikes most than others bike. Because it is exciting than another type of bike riding.Although we have to ensure some predetermined cautious about mountain biking such as GPS for tracking your position. The helmet and other necessary things.
Helmet brings style and safety together and is multifunctional. You can use them for cycling, skating, anything. The vents in the helmet keep you cool whilst you're whizzing along and the extra pads give a comfortable personal fit to you head.


Are Danish Guys the Most Well Endowed?
Well, they say they are anyway. According to an article at Queerty, Danish men have the longest penises, averaging 7.59 inches. The US comes in ninth, with an average of 7.37. Malaysia comes in last, with an average of just over 6 inches. The guys of Italy and Sweden tie for second, with Aussies and Dutchmen tying for third.
Now, of course, this whole poll is anything but scientific. The information comes from Manhunt, a gay dating website. So, that means the guys participating in providing this information may have had a good reason to lie about it. So, in truth, it might only be that the guys in Denmark have longer noses. But, reporting on this sort of information is intriguing, anyway.
The last poll I remember seeing on this subject was from Hipster, in 2005. It didn't rank guys by country, but did give readers a better idea of what "average" really is. According to that poll, average was between six and seven inches; which means that either penises are getting bigger; or lies are.
If you want to see the original article, as published in Queerty, along with the full list of the rankings of 40 countries, click here.


There will be a parent meeting for girls track on Tuesday, March 12th at 5:30 PM in the Ardmore High School Library.
The soccer game scheduled for today has been postponed until Saturday, March 9th. Girls will begin at 3:30 PM and boys will follow at 5:00 PM. We hope to see there!
Follow the link above to hear our school's black history story from those who lived it first hand - Enjoy the video!
Ardmore High School Cheerleaders will be hosting a cheer clinic for Pre-K through 8th grade students on February 8th 2019 – See flyer for more information. Don't want to wait in line to sign your child up for the clinic? Follow the link to pre-enroll. Once you completed the form, print it out and bring it with you to the clinic!
STATE CHAMPS! Yes, you read it right - Congratulations to our AMS Special Olympics basketball team for winning a State Championship title in basketball. We are so proud!


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Recent Arrivals in Aviation
Jullian, Marcel. Battle of Britain, The. (1967)
Danby, Peter A. (Editor). United States Navy Serials 1946 to 1969. (1969)
Harris Patton. Young Eagles. (1932)
Pimlott, John. Pictorial History of Military Aircraft. (1987)
Wragg, David. Wings Over the Sea: A History of Naval Aviatiion. (1979)
Howe. G. Melvyn. Wales from the air: A survey of the physical and cultural landscape. (1966)
Horseman, Martin. Edited By. Aircraft Illustrated Annual 1982.. (1981)
Brickhill, Paul (introduction by H.E. Bates and Foreword by Air Chief Marshal Sir Basil Embry). Escape - or Die; Authentic Stories of the R.A.F. Escaping Society. (1954)
Besse, Francois. Airplanes - 1001 Photos. (2008)
Hugh Allen. THE STORY OF THE AIRSHIP. (1931)
Desfayes. Delta: The Hang Gliding Handbook. (1975)
Schick, W. & Meyer, I. LUFTWAFFE SECRET PROJECTS: FIGHTERS 1939-1945. (1997)
Ziegler, Mano. ROCKET FIGHTER; The story of the Me 163. (1963)
Edwards, B. THE RISE AND FALL OF THE JAPANESE IMPERIAL NAVAL AIR SERVICE. (2010)
Richard Evelyn Byrd. LITTLE AMERICA - AERIAL EXPLORATION IN THE ANTARCTIC THE FLIGHT TO THE SOUTH POLE. (1930)
Snadden, R. BLACK 6 : EXTRAORDINARY RESTORATION OF A MESSERSCHMITT BF 109. (1994)
Deuel, Leo. Flights into Yesterday : The Story of Aerial Archaeology. (1969)
Deichmann, P. (Price, A. edited. ). SPEARHEAD FOR BLITZKRIEG: LUFTWAFFE OPERATIONS IN SUPPORT OF THE ARMY 1939-1945. (1994)
Lovell, Mary S. Straight On Till Morning. The Biography of Beryl Markham. (1987)
THE ROYAL AIR FORCE, 1918-1968: A FIFTIETH ANNIVERSARY YEAR SURVEY. (1968)
Mary Lovell. The Sound Of Wings-The Life Of Amelia Earhart. (1989)
Freeman, Roger A. B-17 Fortress at War.
Stewart, Stanley. Air Disasters - Dialogue from the Black Box. (1994)
Lee, John G. Fighter Facts and Fallacies.
Sims, Edward H. Fighter Tactics and Strategy 1914-1970. (1972)
From Stuka Pilot to Aircraft Structures, from	Wings For You to A Flying Fighter, we can help you find the aviation books you are looking for. As the world's largest independent marketplace for new, used and rare books, you always get the best in service and value when you buy from Biblio.com.au, and all of your purchases are backed by our return guarantee.
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Top Sellers in Aviation
Stuka Pilot by Hans Ulrich Rudel
"Stuka Pilot is the best book ever published about the AIR WAR against Russia. Hans Ulrich Rudel began his amazing career as a Stuka pilot in Poland in 1939, fought in the great Air battles over Leningrad, Stalingrad and Moscow and finished the war flying an FW 190 - survivor of six years' air combat on the Russian Front and the most decorated German pilot of the war!"
Chickenhawk by Robert Mason
More than half a million copies of Chickenhawk have been sold since it was first published in 1983. Now with a new afterword by the author and photographs taken by him during the conflict, this straight-from-the-shoulder account tells the electrifying truth about the helicopter war in Vietnam. This is Robert Mason's astounding personal story of men at war. A veteran of more than one thousand combat missions, Mason gives staggering descriptions that cut to the heart of the combat experience: the fear and belligerence, the quiet insights and raging madness, the lasting friendships and sudden death—the extreme emotions of a "chickenhawk" in constant danger.
The Ravens by Christopher Robbins
"While America and the rest of the world watched the Vietnam war on television, a handful of elite Air Force pilots, wearing anything but uniforms and piloting unarmored, small, prop-driven aircraft, fought a secret war..." in "the other theater - a small nation called Laos, next door to Vietnam, bordered by the Ho Chi Minh Trail..."
Yeager by Chuck; Janos, Leo Yeager
Rickenbacker by Edward V Rickenbacker
Here is the long-awaited story of one of the most exciing American heros of this century. It begins with Captain Rickenbacker's earliest memories as a boy in Columbus, Ohio, and proceeds through a fantastic series of incidents and adventures up to the present time.
Stick and Rudder by Wolfgang Langewiesche
The invisible secret of all heavier-than-air flight: the Angle of Attack. What it is, and why it can't be seen. How lift is made, and what the pilot has to do with it. Why airplanes stall How do you know you're about to stall? The landing approach. How the pilot's eye functions in judging the approach. The visual clues by which an experienced pilot unconsciously judges: how you can quickly learn to use them. The Spot that does not move. This is the first statement of this phenomenon. A foolproof method of making a landing approach across pole lines and trees. The elevator and the throttle. One controls the speed, the other controls climb and descent. Which is which? The paradox of the glide. By pointing the nose down less steeply, you descend more steeply. By pointing the nose down more steeply, you can glide further. What's the rudder for? The rudder does NOT turn the airplane the way a boat's rudder turns the boat. Then what does it do? How a turn is flown. The role of ailerons, rudder, and elevator in making a turn. The landing--how it's made. The visual clues that tell you where the ground is. The tail-dragger landing gear and what's tricky about it. This is probably the only analysis of tail-draggers now available to those who want to fly one. The tricycle landing gear and what's so good about it. A strong advocacy of the tricycle gear written at a time when almost all civil airplanes were taildraggers. Why the airplane doesn't feel the wind. Why the airplane usually flies a little sidewise. Plus: a chapter on Air Accidents by Leighton Collins, founder and editor of AIR FACTS. His analyses of aviation's safety problems have deeply influenced pilots and aeronautical engineers and have contributed to the benign characteristics of today's airplane. Stick and Rudder is the first exact analysis of the art of flying ever attempted. It has been continously in print for thirty-three years. It shows precisely what the pilot does when he flies, just how he does it, and why. Because the basics are largely unchanging, the book therefore is applicable to large airplanes and small, old airplanes and new, and is of interest not only to the learner but also to the accomplished pilot and to the instructor himself. When Stick and Rudder first came out, some of its contents were considered highly controversial. In recent years its formulations have become widely accepted. Pilots and flight instructors have found that the book works. Today several excellent manuals offer the pilot accurate and valuable technical information. But Stick and Rudder remains the leading think-book on the art of flying. One thorough reading of it is the equivalent of many hours of practice.
Lindbergh by A Scott Berg
Few American icons provoke more enduring fascination than Charles Lindbergh—renowned for his one-man transatlantic flight in 1927, remembered for the sorrow surrounding the kidnapping and death of his firstborn son in 1932, and reviled by many for his opposition to America's entry into World War II. Lindbergh's is "a dramatic and disturbing American story," says the Los Angeles Times Book Review , and this biography—the first to be written with unrestricted access to the Lindbergh archives and extensive interviews of his friends, colleagues, and close family members—is "the definitive account."
Lost In Shangri-La by Mitchell Zuckoff
In 1945, a sightseeing trip over "Shangri-La" turned deadly when the plane crashed, leaving only three survivors who, battling for their survival, were caught between man-eating headhunters and the enemy Japanese, in this real-life adventure drawn from personal interviews, declassified Army documents and personal photos and mementos.
The Destruction Of Dresden by David Irving
There can be few operations of war as causeless, as purposeless, and as brutal as the attack on Dresden during the night of February 13th, 1945.
Skunk Works by Ben R ; Janos, Leo Rich
SKUNK WORKS is the true story, told for the first time, of America's most secret and successful aerospace operation. As recounted by Ben Rich, the operation's brilliant boss for nearly two decades, the story of Lockheed's legendary Skunk Works is a high-stakes drama of Cold War confrontations and Gulf War air combat, of extraordinary feats of engineering and human achievement against fantastic odds. SKUNK WORKS is dramatic and immediate. Direct from the cockpits of these astonishing aircraft - U-2 spy-plane, SR-71 Blackbird and F-117 Stealth Fighter. It is a tribute to genius in the unrelenting contest for mastery of the skies.
The Lost Squadron by David Hayes
On July 15, 1942, a squadron of six P-38 Lightnings and two B-17 Flying Fortress bombers was flying from Greenland to Iceland when they ran head-on into an Arctic blizzard. As conditions deteriorated they decided to turn back, only to then discover that the base there [Greenland] was socked in. Running desperately low on fuel the two bombers and six fighter planes crash-landed on the ice cap in the largest forced landing in history. The crews had been rescued but their brand-new warplanes were left on the ice cap. Pat Epps and Richard Taylor heard the story in August 1980. For the next twelve years, this story would lead Epps and Taylor into an extraordinary adventure that would prove more challenging then either of them would have dreamed possible. The planes lay 260 ft down, under the ice, the equivalent of a 25 story building. And no machine in existence was capable of digging hundreds of feet into solid ice to retrieve a ten-ton airplane with a fifty-two foot wingspan. Here, the story is grippingly told and lavishly illustrated with hundreds of fascinating photographs, paintings and diagrams.
First Light by Geoffrey Wellum
First Light is the name of several items. Several albums carry the name: First Light (Wishbone Ash album), a previously unreleased album by rock group Wishbone Ash First Light (album), an unrelated album by folk artist Richard Thompson First Light (Freddie Hubbard album) It can also be used to identify: First Light (Preston book), a nonfiction book on astronomy by Richard Preston First Light (Wellum book), a memoir by Geoffrey Wellum.
Lost Moon by Jim; Kluger, Jeffrey Lovell
God Is My Co-Pilot by Col Robert L Scott
Song Of the Sky by Guy Murchie
Everything But the Flak by Martin Caidin
An Illustrated History Of Seaplanes and Flying Boats by Maurice Allward
War Planes Of the Second World War -Fighters Volume One by William Green
Failure Is Not an Option by Gene Kranz
Boeing Aircraft Since 1916 by Peter M Bowers
The Fall Of Fortresses by Elmer Bendiner
Lost Moon by Jim Lovell
Aircraft Structures by David J Peery
Aviation Books & Ephemera
Wings For You by Cross, E A
Safety In Flight by Jordanoff, Assen
My Wings Are Showing by Wenger, Harry V
The Book Of Flight Tests by Bramson, Alan
Flying High by Cohen, Rose N
The Bomber Offensive by Verrier, Anthony
Skyblazers Your Career In Aviation by Neal, Harry Edward
The Day the Red Baron Died by Titler, Dale M
America's First Eagles by Thayer, Lucien H
Tiger Squadron by Jones, Ira
Megamurder by Burns, E L M
Wonder Aces Of the Air by Smithers, A J
A Flying Fighter by Roberts, E M