printing press operators union
 |
No items matching your keywords were found.
printing press operators union
Solar Power
Solar power is another ancient energy source that has benefited from developments in modern technology. The oldest forms of solar power used sunlight as a direct source of heat energy. One simple device used to reflect solar energy, the parabolic mirror (a dish with a concave reflective surface), can be traced to 3rd century BC Greek mathematician and inventor Archimedes. In 1882 the Frenchman Abel Pifre demonstrated that a parabolic mirror could reflect and focus the sun's rays onto a water boiler, producing sufficient steam power to operate a small printing press. Several modern solar power stations use an array of such reflectors, which move to track the sun, focusing solar energy onto a central boiler.
A relatively new form of solar power, the photovoltaic cell, converts sunlight directly into electricity. The photovoltaic cell is a semiconductor device, closely related to a computer chip, that relies on the photoelectric effect. Discovered by French scientist Antoine Edmund Becquerel in 1839, the photoelectric effect describes how sunlight can create an electric current by generating electrically charged particles.
Developed by scientists at Bell Laboratories in 1954, modern solar cells are generally made of crystalline silicon, a semimetallic element. Photovoltaic cells were first developed in the 1960s as a power source for orbiting spacecraft in the U.S. space program. They are now widely used as a power source for satellites, remote communications systems, traffic signs, and consumer electronic devices such as pocket calculators and watches. Advancing technology has driven production costs down by 80 percent in the past 20 years, and solar electricity is beginning to emerge as a potential competitor to fossil fuels.
In one new application, several companies have integrated solar cells into a new generation of roofing shingles, tiles, and window glass, allowing homes and office buildings to generate their own electricity. In the United States, a home equipped with this technology costs roughly $20,000 more than an average, traditionally powered home. A significant market for this technology is emerging in Japan, due to a system of government supports introduced in 1995. By the end of 1998, Japan is expected to have at least 25,000 solar-powered homes-enough to electrify a city of 100,000 people.
Both the United States and the European Union (EU) announced solar-roof programs in 1997. These programs, which are still being formulated, are partnerships with state and local governments as well as the private sector. They are intended to provide tax incentives, low-cost financing, and other assistance for those who want to use solar power.
The main impediment to increased reliance on solar power is cost. Most experts believe the cost of solar cells must fall by 50 to 75 percent to be fully competitive with coal-fired electricity. Automated manufacturing, larger factories, and more efficient cells may deliver major cost reductions in the near future. But for now, solar cells are used primarily in remote locations, where access to other forms of power is sharply constrained.
One breakthrough that promises to significantly reduce costs is the development of a new generation of thin-film solar cells. These cells are less than one one-hundredth the thickness of conventional solar cells. They do not need to be sliced or rigidly encased, eliminating a costly process, and they can be made into large, flexible sheets ideal for integration into building materials. Thin-film solar cells also use less raw material, further reducing costs.
Click Here Discover How You Can Build Your Own Electric Energy Source at Home!
About the Author
Nelson Doe is a recognized home energy expert from Nottingham. Click Here To Discover more about building your home energy source here: http://alturl.com/axjij
|
|
The Printing Press $5.96 The Printing Press |
|
|
Press-Printing $49.99 Press-Printing - Giclee Print |
|
|
Printing Press $49.99 Printing Press - Giclee Print |
|
|
Mechanical Printing Press $49.99 Mechanical Printing Press - Photographic Print |
|
|
The Invention of the Printing Press $49.99 Neville Dear The Invention of the Printing Press - Giclee Print |
|
|
Benjamin Franklin's Printing Press $34.99 Benjamin Franklin's Printing Press - Giclee Print |
|
|
Newspaper Printing Press Room $14.99 Newspaper Printing Press Room - Premium Poster |
|
|
Early Printing Press $44.99 English School Early Printing Press - Giclee Print |
|
|
Caxton's Printing Press $44.99 McConnell Caxton's Printing Press - Giclee Print |
|
|
Printing Press by Applegarth and Cowper $49.99 Printing Press by Applegarth and Cowper - Giclee Print |
|
|
Huge Mechanical Printing Press $49.99 Huge Mechanical Printing Press - Photographic Print |
|
|
Paper Is Placed in the Printing Press $24.99 Heinz Zinran Paper Is Placed in the Printing Press - Photographic Print |
|
|
French Printing Press, 1642 $34.99 Abraham Bosse French Printing Press, 1642 - Giclee Print |
|
|
Worker Feeds a Printing Machine at a Printing Press in Singapore $39.99 Eightfish Worker Feeds a Printing Machine at a Printing Press in Singapore - Photographic Print |
|
|
Johann Gutenburg And the Printing Press $33.99 In graphic novel format, shows how and why Johann Gutenberg invented the printing press and how it revolutionized book printing. |
|
|
Johannes Gutenberg and the Printing Press $46.32 Describes the life of Johann Gutenberg, his childhood and career, and the invention of the printing press, with a short history of printing and the spread of printing after Gutenberg's invention. |
|
|
Semi-Nude Genie with Printing Press $49.99 Semi-Nude Genie with Printing Press - Giclee Print |
|
|
View of the Printing Press Aboard the Ivernia $39.99 View of the Printing Press Aboard the Ivernia - Photographic Print |
|
|
A View of the Printing Press for the Lassen Advocate $49.99 A View of the Printing Press for the Lassen Advocate - Photographic Print |
|
|
French Printing Press of the 15th Century $34.99 Gerlier French Printing Press of the 15th Century - Giclee Print |
|
|
The Printing Press (Paperback) $7.91 Introduces printing and the history of printing technology, from woodblock prints to new technologies in 3-d printing. |