... photon waves are not moving along together because they are not being emitted at the same instant but instead in random short bursts. Such beams are called incoherent. The process for laser action, was first proposed by Albert Einstein in 1917. The working principles of lasers were outlined by the American physicists Arthur Leonard Schawlow and Charles Hard Townes in their 1958 patent application. The patent was granted but was later challenged by the American physicist and engineer Gordon Gould. In 1960 the American physicist Theodore Maiman observed the first laser action in solid ruby. HOW A LASER WORKS A laser is made up of several basic components. On ...
... in upstate New York. Two died and 65 others were hospitalized. If you think this couldn't happen to you, think again. A recent federal audit found that nearly 90 percent of all violations of the Safe Drinking Water Act go unreported. Some of those violations are harmless data-entry errors, but they also include potentially lethal problems such as contamination with pesticides and fecal coliform bacteria. Things must be done in order to preserve NJ environment. The enforcement of laws against pollution is one of the things being done to preserve NJ environment.In theory, a regional EPA office can take its own enforcement action where the state has failed to do an ad ...
... the universe could also be this way. It also showed the Earth to be just a planet. Not the unique figure thought to be. It is not unique. In fact, it was regular because the moon also had the same properties. The second observation was the four moons of Jupiter. Galileo observed points of light that changed their positions with time around the Planet. These points he concluded were the four moons that orbit Jupiter. It showed that there were things in the heavens that Aristotle knew nothing about. The was not unique anymore because it wasn’t the only planet to have objects orbit it. And last but not least, Galileo saw that the Earth shines on the moon. It s ...
... hammered round and painted white. The feathery sometimes flew over 300 yards and was durable - until it got wet. Then it would split open. The Gutta percha was introduced in 1850 and was made of a rubberlike sap from the Malaysian sapdilla tree. The material was heated to soften it and then hand-formed into a solid, one piece ball.Gutta percha was black, so the early balls were painted white. Easier to make, less expensive, and more durable, the gutta revolutionized golf. When golfers discovered that balls and nicks flew longer and straighter then new ones, manufactures began to give them a textured, even pattern surface. The most popular early pattern was ...
... on different forms in children than in adults. Adolescence is a time of emotional turmoil, mood swings, gloomy thoughts, and heightened sensitivity. It is a time of rebellion and experimentation. Blackman (1996) observed that the "challenge is to identify depressive symptomatology which may be superimposed on the backdrop of a more transient, but expected, developmental storm." Therefore, diagnosis should not lay only in the physician's hands but be associated with parents, teachers and anyone who interacts with the patient on a daily basis. Unlike adult depression, symptoms of youth depression are often masked. Instead of expressing sadness, teenagers may exp ...
... but they could make a person unable to fight. Some of these are called blister agents, which cause big blisters on your skin. A blister agent called mustard gas caused a lot of deaths on both sides during World War I. Some other chemical agents can cause temporary blindness or mental confusion. But people still can defend themselves against all of these chemical agents. For example, gas masks, other protective coverings for the body, and injections of antidotes are used as defenses against chemical agents. Chemical agents also have nonmilitary uses. For example, riot control agents, including tear gas, can be used to control rioting crowds. These agents just affe ...
... travel first in a northwestern direction and in the higher latitudes turn toward the northeast. In the Southern Hemisphere the usual path of a hurricane is first to the southwest and then turning toward the southeast. are characterized by strong winds and pouring rain. Thunderstorms and waterspouts appear in the storm's cloud system. All contain an eye. The eye of a hurricane is a low pressure, calm area in the middle of the storm. The air in the eye is sinking and this causes there to be no rain in this area and little wind. This gives the impression that the storm has passed through. It is not safe yet though. Within a few hours depending on the size o ...
... We recognize this process as burning. The individual relies on food for fuel which contains energy-giving substances that our bodies can store until we need this energy to use our muscles. When we do use our muscles within us, we may not always be sure that heat is given off. Our bodies do not burst into flames but the perspiration on our skin is a clue to what is happening. The movement of the windsurfer has a different explanation. The windsurfer is propelled along by a sail which collects from the winds that sweep along the water. This energy has been produced by the sun which warms the earth's surface and sets the air above in motion. The sun's heat co ...
... a phone line, it's a lifestyle. Some s do that in parallel with the standard voice service, all on the same line and at the same time. Some deliver higher speeds or wider bandwidth - the more dense the data you are sending, the wider the bandwidth you need for quality and speedy transmission. Still others deliver higher capacity for downloading than for uploading data. There is a whole portfolio of technologies coming on stream to match user needs at home and at work. The new millennium is about to put a completely new dimension into those telephone lines we have all come to take for granted. Already there are towns and cities around the globe which really ...
... from cytoplasm by a nuclear envelope, the association of DNA with histone proteins and its organization into a number off distinct chromosomes, and complex organelles, among which are chloroplasts and mitochondria. Scientists believe that eukaryotic organisms such as the protists evolved from the prokaryotes. There are two main theories which describe how this transition may have occurred. The first is the endosymbiotic theory, or enosymbiosis, and the other is the autogenous theory, or autogenisis. These two theories are not mutually exclusive, meaning one or the other could account for different parts of eukaryotic cells. The endosymbiotic theory states that ...
