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有关机经中“G1银河系”的背景资料

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楼主
发表于 2009-11-24 11:50:16 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
看到WJ1304 Onghat SHANGHAIGO 都找到了原文 (表示感谢哈:)

自己看机经的时候,也是这找了下,发现了一些关于机经中说的那篇比较绕的“G1银河系”的背景资料
贴上来与大家分享一下,是wiki的,里面的参考文献也可以看一下,有在TIME上的评论等,反正就当积累背景知识,联系阅读了

也请考过的TX给确认一下

8楼 由无盐 tx添加了有关苹果寂静的原文,俺还没有考试,请过来的TX确认


最后祝大家这个月考试顺利!

文章出处: http://en.wikipedia.org/wiki/Rogue_planet
In 1998, David J. Stevenson authored a paper entitled "ossibility of Life Sustaining Planets in Interstellar Space."[5] In this paper, Stevenson theorizes that some wandering objects, that Stevenson refers to as "planets", drift in the vast expanses of cold interstellar space and could possibly sustain a thick atmosphere which would not freeze out due to radiative heat loss. He proposes that atmospheres are preserved by the pressure-induced far infrared radiation opacity of a thick hydrogen-containing atmosphere.

It is thought that during planetary system formation, several small protoplanetary bodies may be ejected from the forming system.[6] With the reduced ultraviolet light associated with its increasing distance from the parent star, the planet's predominantly hydrogen and helium containing atmosphere would be easily confined even by an Earth-sized body's gravity.

It is calculated that for an Earth-sized object at a kilobar hydrogen atmospheric pressures in which a convective gas adiabat has formed, geothermal energy from residual core radioisotope decay will be sufficient to heat the surface to temperatures above the melting point of water.[5] Thus, it is proposed that interstellar planetary bodies with extensive liquid water oceans may exist. It is further suggested that the bodies are likely to remain geologically active for long periods, providing a geodynamo-created protective magnetosphere and possible sea floor volcanism which could provide an energy source for life.[5] The author admits these bodies will be difficult to detect due to the intrinsically weak thermal microwave radiation emissions emanating from the lower reaches of the atmosphere.

A study of simulated planet ejection scenarios has suggested that around five percent of Earth-sized planets with Moon-sized moons would retain their moons after ejection. A large moon would be a source of significant geological tidal heating.[7]
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沙发
 楼主| 发表于 2009-11-25 10:09:20 | 只看该作者
自己顶起来,让更多人看到
板凳
发表于 2009-11-25 10:11:39 | 只看该作者
我也帮忙顶 让考过试的同学们来确认 谢谢楼主的资料
地板
发表于 2009-11-25 10:56:17 | 只看该作者
谢谢LZ~~~~~~~
5#
发表于 2009-11-25 12:29:44 | 只看该作者
LZ好样的!
6#
 楼主| 发表于 2009-11-25 13:19:13 | 只看该作者
没什么,俺是自知没有能力去整理整个机经,也只能这样帮帮小忙
7#
发表于 2009-11-25 13:36:08 | 只看该作者
LZ加油~
8#
发表于 2009-11-25 16:36:17 | 只看该作者
那原文在哪儿,方便留个链接么?
9#
发表于 2009-11-25 16:51:43 | 只看该作者
thanks a lot!
10#
发表于 2009-11-25 19:41:37 | 只看该作者
谢谢!我也找了Apple那篇的,但不确定是不是 麻烦考过的TX帮我们确认下 哈  同时也动员大家都一块找找 分工合作哈
Contract Evolution and Institutional Innovation:
The American Fresh Fruit Industry from 1890 to 1930
Carolyn Dimitri, University of Maryland, College Park
NOTE: The summary which appeared in the October 1997 issue of The Newsletter of The Cliometric Society contained graphics which cannot be accurately reproduced in this version.
The system of producing and marketing fresh fruits experienced a major transformation between 1890 and 1930. For the first part of this time period, only local markets existed, with fresh fruits sold by producers directly to consumers. By 1930, however, fruit was grown in regions far from final consumers, with middlemen purchasing from farmers and selling to retailers. Two innovations, rail transportation and refrigeration, provided the infrastructure needed to shift fruit distribution from a local to a national scale. Rail transportation gave farmers access to nearby markets, but efforts at transporting fruits to distant markets failed since the crops generally rotted before delivery. The subsequent development of refrigeration preserved fruit quality during the long trip from Western orchards, for example, to consumers in large Midwest and Eastern cities.
Following these innovations, regional specialization of fruit production began to dominate the industry. It was during this time that the Pacific region, for example, began growing more deciduous fruit than any other region in the nation. In addition, it was during this period that the beginning of what is currently a government-administered, industry-financed inspection service was legislated by Congress. This paper examines the historical evidence in the context of agency theory, providing support for the idea that, in the spirit of North, technological change, institutional innovation, and economic growth were closely related in the American fresh fruit industry.
The transition from local, independent markets to a national industry was rocky, with frequent disputes between sellers and buyers. One source of conflict stemmed from the changing contractual relationship between the two groups. Local traders were accustomed to meeting the same partners over time, and so relied on reputation and repeat business to enforce contracts. In the national market, however, a large number of buyers and sellers were separated by long distances.1 In this new, impersonal market, there was no mechanism to convey information about past actions, and so it was impossible for traders to develop reputations for ethical business practices and high quality fruit.2 Without reputation or repeat business to bond buyers and sellers, both parties found reneging on contract terms profitable. Thus, the old methods of contract enforcement that worked when trade was confined to small regions were no longer able to enforce the new long-distance contracts.
Low fruit quality, real or reported, was a central theme in the conflicts between buyers and sellers. Low quality in the receiving market was caused by a combination of factors - the quality of produce the farmer shipped plus the effect of shipping over long distances by the railroad. Ignorance led some growers to ship low quality produce, not realizing that higher profits could be earned by selling only top quality fruit. Other growers deliberately misrepresented fruit by labeling low quality fruit as high quality. For example, apple growers would "face" barrels with high quality apples and fill the interior with lower quality apples unsuitable for eating.
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