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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？
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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？
Mark Twain's Adventures of Huckleberry Finn
Samuel Clemens, whose pen name is Mark Twain, publishes Adventures of Huckleberry Finn in 1885 in America. He has been at work for eight years on the story of an outcast white boy, Huck, and his adult friend Jim, a runaway slave, who together flee Missouri on a raft down the Mississippi River in the 1840s. The book's free-spirited and not always truthful hero as well as its lack of respect for religion or adult authority drew immediate fire from newspaper critics. The ungrammatical vernacular voice in which Huck narrates the book was also attacked as coarse and inappropriate. Some readers found the colorful stories Huck tells immoral, sacrilegious, and inappropriate for children. The Concord, MA, library banned Adventures of Huckleberry Finn a month after its publication, calling it "trash and suitable only for the slums." Other libraries followed suit.
In the decades after Twain's death in 1910, Adventures of Huckleberry Finn gains the status of a masterpiece. Novelist Ernest Hemingway remarks that "All modern American literature comes from one book by Mark Twain called Huckleberry Finn," and other writers as diverse as American poet T. S. Eliot and African American novelist Ralph Ellison add their acclaim. It is increasingly studied at both the high school and college level, where its literary merit and the insights it offers into American society are praised. In particular, some consider Twain's satire to be a powerful attack on racism.
Others see Adventures of Huckleberry Finn not as an attack on racism, but as inherently racist itself. African Americans and others, led by the NAACP, begin to challenge the book in the 1950s, appalled by the novel's portrayal of the slave Jim and its repeated use of the word "nigger." The book is removed from some schools in the New York City school system, and its place on required reading lists is threatened in other cities.
Debates about Adventures of Huckleberry Finn continue to the present day. The crux of the controversy remains race, although some, notably Pulitzer Prize-winning author Jane Smiley for example, assert that the book's reputation as a literary classic is exaggerated. In 1998, Kathy Monteiro, parent of a student in a Tempe, AZ, high school, sued the school district, claiming that an already tense racial environment was exacerbated by the assignment of Adventures of Huckleberry Finn as required reading. Although the judges decline to ban the book, they do state that a school district has a legal duty to take reasonable steps to eliminate a racially hostile environment and can be held liable for damages if they fail to make this effort. While Monteiro and her supporters hail this as a victory, the questions of whether Adventures of Huckleberry Finn contributes to a racially hostile environment and whether it should be assigned in high school remain unresolved.
What happened to the book Adventures of Huckleberry Finn when published in 1885？
A model of the development of the information sciences is described and used to account for past events and predict future trends, particularly fifth and sixth generation priorities. The information sciences came into prominence as electronic device technology enabled the social need to cope with an increasingly complex world to be satisfied. The paper provides a framework for the information sciences based on this logical progression of developments. It links this empirically to key events in the development of computing. The fifth generation development program with its emphasis on human-computer interaction and artificial intelligence, and the sixth generation research program with its emphasis on knowledge science are natural developments in the foci of attention indicated by the model.
The fifth generation development program emphasizes
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