Ulcerative colitis is a chronic, relapsing condition. Chronic means that it is persistent and ongoing. Relapsing means that there are times when symptoms flare up (relapse) and times when there are few or no symptoms (remission). The severity of symptoms and how frequently they occur vary from person to person.
Photovoltaics (PV) is the name of a method of converting solar energy into direct current electricity using semiconducting materials that exhibit the photovoltaic effect, a phenomenon commonly studied in physics, photochemistry and electrochemistry.
A photovoltaic module is a grouping of connected solar cells used to collect energy from solar radiation. Each cell is electrically connected into these modules, which in turn are merged into a panel. When photovoltaic panels are installed at various locations they become known as arrays.