题目内容
Financial assistance may be available in the form. of employment or opportunities for assisting faculty researchers. The Faculty of Graduate Studies offers fee scholarships to graduate students who hold a major Canadian national or international scholarship which is won on a competitive basis.
Graduate Conference Travel Grants are available to assist graduate students in presenting results of their thesis research at scientific or scholarly meetings.
Tuition Fees
Tuition fees are $4,373 (2002 figures) for one year for students entering the program with a 4-year Bachelor's degree. Continuing registration fees are $1,245 for subsequent years of registration in the program. Tuition fees are $4,373 (2002 figures) for two years for students entering a PhD program with a Master's degree. Continuing registration fees are $1,245 for subsequent years of registration in the program. Note that tuition fees are double for visa students.
How much does a visa student have to pay first for his tuition for entering a PhD program with a Master's degree in 2002？
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NDEs and OBEs
In NDEs (Near Death Experiences) one of the first things the experiencer notices is being outside his body. Below, I have described two typical OBE (Out-of-Body Experience) situations found in NDEs. These are used for illustration purposes and are not intended to be comprehensive.
In the first, the experiencer finds himself floating in the air looking down on the activity below. If this is a hospital room, he will see the doctors and nurses working on his lifeless body. The doctors' conversations will be remembered and the tools they are using identified by the experiencer after he is brought back to life.
In the second, the experiencer leaves the location of his lifeless body and visits other places and/or people. Upon being brought back to life the experiencer will remember in detail the conversations and events seen while OBE. Many of these conversations and events will later be verified by those the experiencer observed while OBE.
What is most likely the meaning of the abbreviation of OBE？
Which of the following does NOT help to separate the useful U-235 and nearly useless U~2387
The History of the Atomic Bomb
On August 2, 1939, just before the beginning of World War Ⅱ, Albert Einstein wrote to then President Franklin D. Roosevelt. Einstein and several other scientists told Roosevelt of efforts in Nazi Germany to purify uranium-235, which could be used to build an atomic bomb. It was shortly thereafter that the United States Government began the serious undertaking known then only as "The Manhattan Project." Simply put, the Manhattan Project was committed to expediting research that would produce a viable atomic bomb.
The most complicated issue to be addressed in making of an atomic bomb was the production of ample amounts of "enriched" uranium to sustain a chain reaction. At the time, uranium-235 was very hard to extract. In fact, the ratio of conversion from uranium ore to uranium metal is 500:1. Compounding this, the one part of uranium that is finally refined from the ore is over 99% uranium-238, which is practically useless for an atomic bomb. To make the task even more difficult, the useful U-235 and nearly useless U-238 are isotopes (同位素), nearly identical in their chemical makeup. No ordinary chemical extraction method could separate them; only mechanical methods could work.
A massive enrichment laboratory/plant was constructed at Oak Ridge, Tennessee. Harold C. Urey and his colleagues at Columbia University devised an extraction system that worked on the principle of gaseous diffusion, and Ernest O. Lawrence (inventor of the Cyclotron) at the University of California in Berkeley implemented a process involving magnetic separation of the two isotopes.
Next, a gas centrifuge was used to further separate the lighter U-235 from the heavier, non fissionable U-238. Once all of these procedures had been completed, all that needed to be done was to put to the test the entire concept behind atomic fission ("splitting the atom," in layman's terms).
Over the course of six years, from 1939 to 1945, more than $ 2 billion was spent during the history of the Manhattan Project. The formulas for refining uranium and putting together a working atomic bomb were created and seen to their logical ends by some of the greatest minds of our time. Chief among the people who unleashed the power of the atom was J. Robert Oppenheimer, who oversaw the project from conception to completion.
Finally, the day came when all at Los Alamos would find out if "The Gadget" (code-named as such during its development) was going to be the colossal dud of the century or perhaps an end to the war. It all came down to a fateful morning in midsummer, 1945.
Which of the following is the least possible reason for the launching of the Manhattan Project？
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