Closed-circuit television

Closed-circuit television (CCTV), also known as video surveillance, is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors. It differs from broadcast television in that the signal is not openly transmitted, though it may employ point to point (P2P), point to multipoint, or mesh wireless links. Though almost all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that may need monitoring such as banks, casinos, airports, military installations, and convenience stores. Videotelephony is seldom called "CCTV" but the use of video in distance education, where it is an important tool, is often so called.

In industrial plants, CCTV equipment may be used to observe parts of a process from a central control room, for example when the environment is not suitable for humans. CCTV systems may operate continuously or only as required to monitor a particular event. A more advanced form of CCTV, utilizing digital video recorders (DVRs), provides recording for possibly many years, with a variety of quality and performance options and extra features (such as motion detection and email alerts). More recently, decentralized IP cameras, some equipped with megapixel sensors, support recording directly to network-attached storage devices, or internal flash for completely stand-alone operation. Surveillance of the public using CCTV is particularly common in many areas around the world. In recent years, the use of body worn video cameras has been introduced as a new form of surveillance.

CCTV-Storm Music

CCTV-Storm Music is a music Pay television channel of the China Central Television and it is aired throughout the People's Republic of China, Hong Kong and Macao.

CCTV-Nostalgia Theater

CCTV-Nostalgia Theater is a Pay television channel of the China Central Television of the People's Republic of China. It broadcasts predominant classic movies, TV series and documentaries from the CCTV channels. CCTV-Nostalgia Theater operates from 8:00am until 2:00am of the following day.

Volunteering

Volunteering is generally considered an altruistic activity where an individual or group provides services for no financial gain. Volunteering is also renowned for skill development, and is often intended to promote goodness or to improve human quality of life. Volunteering may have positive benefits for the volunteer as well as for the person or community served. It is also intended to make contacts for possible employment. Many volunteers are specifically trained in the areas they work, such as medicine, education, or emergency rescue. Others serve on an as-needed basis, such as in response to a natural disaster.

Etymology and history

The verb was first recorded in 1755. It was derived from the noun volunteer, in C.1600, "one who offers himself for military service," from the Middle French voluntaire. In the non-military sense, the word was first recorded during the 1630s. The word volunteering has more recent usage—still predominantly military—coinciding with the phrase community service. In a military context, a volunteer army is a military body whose soldiers chose to enter service, as opposed to having been conscripted. Such volunteers do not work "for free" and are given regular pay.

Volunteer (botany)

In gardening and agronomic terminology, a volunteer is a plant that grows on its own, rather than being deliberately planted by a farmer or gardener. Volunteers often grow from seeds that float in on the wind, are dropped by birds, or are inadvertently mixed into compost. Unlike weeds, which are unwanted plants, a volunteer may be encouraged by gardeners once it appears, being watered, fertilized, or otherwise cared for. The action of such plants – to sprout or grow in this fashion – may also be described as volunteering.

Volunteers that grow from the seeds of specific cultivars are not reliably identical or similar to their parent, and often differ significantly from it. Such open pollinated plants, if they show desirable characteristics, may be selected to become new cultivars.

Agriculture

In agricultural rotations, self-set plants from the previous year's crop may become established as weeds in the current crop. For example, volunteer winter wheat will germinate to quite high levels in a following oilseed rape crop, usually requiring chemical control measures. In agricultural research, high purity of a harvested crop is usually desirable. To achieve this, typically a group of temporary workers will walk the crop rows looking for volunteer plants, or "rogue" plants in an exercise often referred to as "roguing."

Volunteer (disambiguation)

Volunteer or Volunteers may refer to:

Volunteerism

Ships