Diffraction And The Debye-Scherrer Camera
.... phase angle and has units of radians per second.
The phase constant determines the position of the particle at time t = 0. The quantity (wt+ f) is called the phase. The above function x repeats itself whenever wt = n2p where n is an integer. The period T of the motion is the time it takes for the motion to complete one revolution or cycle. The unit for the period T is seconds. Since the function repeats itself every period T for any time t and it has already been written that we know that wt = 2p when the function x repeats itself
wt + f + 2p = w(t+T) + f
so wT = 2p
so
T = 2p/w
The frequency of the motion i .....
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Tomatoes
.... the species name to esculentum which roughly means "edible".
The common cultivated tomato belongs to the genus Lycopersicon. This genus exhibits a vast reservoir of genetic variability which remains largely underexploited. Some disease resistance, which is now a part of most commercially available cultivars, has been derived from related species of Lycopersicon. However, these other species may provide other potential benefits such as heat or cold tolerance, salt tolerance, higher nutrient amounts and possibly other yet undiscovered potentials. Some of these species cross readily to Lycopersicon esculentum, but a few othe .....
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Flooding
.... scientists who are skeptical about erosion-fighting programs. There were those who believed people should not be allowed to rebuild in hazardous areas and those who would not forbid them to build as long as they did not ask for recompense when they got into trouble. One group has felt property owners should not be compensated if they are forbidden to rebuild, and others say it is unconstitutional to take property without compensation.
The November 1997 meeting helped to demonstrate that the issue of sea level rise is more than a retreat slogan; it is an important environmental condition that underlies many of the eros .....
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Water Pollution
.... rings, fishing lines, and net that humans discard into the ocean waters. Once entangled, they are unable to free themselves which can cause deep cuts, starvation, and drowning. Many ocean mammals have died as a result of ingesting these plastic items. In 1985, a sperm whale beached itself on a New Jersey shore; a mylar balloon was lodged in its stomach, and three feet of ribbon in its intestines. Most plastics take hundreds of years to break down. Many of the discarded items will sink to the ocean floor where they will combine with sediments, thus prolonging their duration in the sea.
Other point sources of pollution .....
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Advanced Green Builder Demonstration House
.... of the house in such a way that it creates an entranceway into the house that lets visitors know the occupants concern for the environment. Along side the huge silver cisterns is the waste water cleaning system that was designed to be as aesthetically pleasing as possible through the use of indigenous plants. The plants gradually clean the wastewater as it passes under their roots. Along with cleaning the water and being aesthetically pleasing, the plants also create a pleasant atmosphere as the water in the plants help in the calming of the harsh Texas climate. Although hidden out of view, the house is roofed with photovo .....
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The Effects Of Hurricane Gilbert
.... up to 121 mph (Stengel 18). At 10, 000 feet, Gilbert's Counter clockwise winds reached up to 200 miles per hour, and at ground level the winds were around 175 mph(Stengel 17). With winds that strong, almost nothing could stop that storm. When the winds began to spread out over a large area, they stirred the Atlantic waters and brought cool water underneath the earth's surface; therefore, causing a reduction in the amount of rapid showers and thunderstorms (Sheets 1).
Water was another contributing factor in the destruction caused by Hurricane Gilbert. Hurricane Gilbert formed in the same manner as most tropical storms do. " .....
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Nuclear Power
.... only about eleven percent of the world's electricity. There are around 316 nuclear power plants in the world that create 213,000 megawatts of electricity. (INFOPEDIA) Radioactive, or nuclear, waste is the by-product of nuclear fission. Fission occurs when atoms' nucleus' split and cause a nuclear reaction. (General Information) When a free neutron splits a nucleus, energy is released along with free neutrons, fission fragments that give off beta rays, and gamma rays. A free neutron from the nucleus that just split splits another nucleus. This process continues on and is called a chain reaction. (World Book vol. 14, 588)
The .....
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Detrimental Effects That Technological Advances In Industry And Agriculture
.... even when scientists had already discovered the terrible effects of the chemical combination.
Sagan says that to slowly stop usage of such obviously dangerous substances is not enough, for even with current conditions, it is estimated that the damaged ozone layer will require at least 100 years to repair itself. In the interim, we are risking danger to the food chain, global warming, and increased cases of skin cancer. Rather than risk these catastrophes, Sagan calls for the immediate phase-out of CFCs, as well as to improve energy usage, plant trees, and curb the population explosion as supplemental methods to imp .....
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An Agricultural Movement
.... used for centuries. In James Whorton’s book, Before Silent Spring, he describes agriculture before the Industrial Revolution. He writes that farmers in the 1800's used arsenic and sulphur to stop insects and molds from harming their crops. Even then it was known that arsenic caused skin lesions, nausea, vomiting, diarrhea, and swollen, painful hands and feet. In England in the late 1800's, arsenic was found in contaminated sulphuric acid, used then to make glucose for “cheap beer”. People in the poorest classes, who could only afford this “cheap beer”, were displaying these symptoms, along with neurological problems and in s .....
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The Problem With Desertification
.... These areas cover more than 40 percent of the world’s land surface. As these areas decrease in size, so does the reliability of the land to support the human population. In some areas, desertification is occurring to such a degree that some lands can no longer sustain life. Large regions which have been greatly affected include: the Savannas of Africa, the Great Plains and the Pampas of America, the Steppes of Asia, the Outback of Australia, and the margins of the Mediterranean (World Atlas of Desertification, 1997).
Some of the leading causes of desertification are due to human mismanagement. The four major human factors .....
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Plate Tectonics
.... ranges have a deep trench which bisects the length of the ridges and in places is more than 2000 meters deep. Research into the heat flow from the ocean floor during the early 1960s revealed that the greatest heat flow was centered at the crests of these mid-oceanic ridges. Seismic studies show that the mid-oceanic ridges experience an elevated number of earthquakes. All these observations indicate intense geological activity at the mid-oceanic ridges.
Geomagnetic Anomalies
Peridically, the Earth's magnetic field reverses. New rock formed from magma records the orientation of Earth's magnetic field at the time the m .....
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Hurricanes
.... it soaks up more and more water vapour. At the storm center, this new supply of water vapor gets pulled into the thunderhead updrafts, releasing still more energy as the water vapor condenses. This makes the updrafts rise faster, pulling in even larger amounts of air and water vapor from the storm's edges. And as the updrafts speed up, air swirls faster and faster around the storm center. The storm clouds, moving with the swirling air, form a coil.
In a few days the hurricane will have grown greatly in size and power. The swirling shape of the winds of the hurricane is shaped like a dough-nut. At the center of this giant "doug .....
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