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大学计算机课程学习路线

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发表于 2012-4-12 12:54:43 | 显示全部楼层
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发表于 2012-4-12 20:00:43 | 显示全部楼层
学到操作系统,然后、然后,那老师天天自言自语的,讲的实在是。。。阿门
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发表于 2012-4-15 01:17:33 | 显示全部楼层
收藏起来 以后学懂了C在加油
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发表于 2012-4-20 22:16:51 | 显示全部楼层
有种豁然开朗的感觉~
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发表于 2012-5-12 00:40:13 | 显示全部楼层

Future Energy Concepts The Fuel Cell

with global warming, general pollution and rising fuel prices, our future energy needs are a hot topic. fuel cells may represent a solution, one coming sooner than later.. T4 ?! P0 N/ y4 d% Q( O
future energy concepts
& y4 ]7 x$ S0 Q0 i" @note: the content of this article solely conveys the opinion of its author nike free run dillards,
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; `# |9 g2 z# S6 l4 B1 H+ B7 ^with global warming, general pollution and rising fuel prices nike free run amazon, our future energy needs are a hot topic. fuel cells may represent a solution, one coming sooner than later.
9 `% _' N4 ^, w6 ~, R3 J- T6 \. ?future energy concepts ?c the fuel cell
9 O$ ^& @+ n, r# U+ _7 k, \# D3 Ka fuel cell is a fairly vague phrase thrown around by those in the know and those that know relatively little. regardless of the particular design, a fuel cell is essentially a cell similar to a battery in which a chemical process occurs to produce electricity. in this case, however, the fuel is hydrogen. the basic idea is to combine hydrogen with oxygen in a process that produces electricity. this electricity is then used as we would normally use it in our lives.4 C1 t9 x. \/ }2 r+ o
if you read the paper or watch the news, one would think the concept of hydrogen fuels in a new one. in fact, it is not. the first one was created in 1839. the problem nike free run 2 mens all black, of course, was it was inefficient and there wasn??t much interest since fossil fuels were plentiful and our energy needs were tiny compared to today. it wasn??t until the 1960s that much interest was shown in the energy platform. as with many advances, nasa decided to use fuel cells to power the gemini and apollo spacecrafts. unfortunately, the trick has been translating this limited use to wide spread applications in daily life.- t7 s& c* Z8 C( ?, B
a common misconception is a fuel cell represents renewable energy. very clearly, it does not. it is a device, not an energy platform. it is like saying a hydroelectric dam is a renewable energy. the dam is a machine to harness a renewable energy resource, but not an energy source in and of itself. the fuel cell works much the same way. it is a methodology for harnessing energy from hydrogen. the particular method can be clean or dirty, to wit, one can use water or coal for the base material. obviously, coal is not much help.
( t4 Y+ N1 E  p8 Hfuel cells can be run, in theory, on any material containing hydrogen. this means renewable energy sources such as hydrogen, biogas nike free run barefoot, and so on. the primary goal is to focus on water and other renewable sources because of their inherent clean advantages. when hydrogen is used nike free run 2 cheap, for instance nike free run purple, it produces no tangible pollution or greenhouse gases. the byproduct, instead, is simply water.3 |4 i& g5 `1 [  Q. u) ~
there are a few hurdles that must be overcome before hydrogen fuel cells really become a viable energy platform. first, the technology is such that the fuel cells are far too large and heavy to be used for practical purposes. the infamous hydrogen car is not currently viable because of this, although test cars from primarily german manufacturers are being evaluated. the second problem is efficiency, which is to say fuel cells are not. currently, fuel cells produce energy at a cost of about 10 times that of fossil fuels, and that is a positive estimate. again, not a viable option.0 g, q/ d. s- l
while these may seem like significant hurdles, they actually point to the viability of hydrogen fuel cells as a power source. these problems are focused on technical aspects of delivery, not on whether the process works. if there is anything we are good at as a species, it is making technological breakthroughs. if we can build a hydrogen nuclear weapon, surely we can build a hydrogen fuel cell.
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future energy concepts  the fuel cell8 D: K' z3 l/ e! H* O" f% `6 S
by:  .... click on the author's name to view their profile and articles!!!
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发表于 2012-5-12 09:26:01 | 显示全部楼层
人生重要的不是所站的位置,而是所朝的方向!
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楼主福如东海,万寿无疆!
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发表于 2012-5-12 20:00:46 | 显示全部楼层
请问您是哪所大学什么专业的?毕业了么?
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发表于 2012-5-12 22:59:47 | 显示全部楼层
{:1_1:}真的很专业
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发表于 2012-5-13 00:09:53 | 显示全部楼层
未来之路不好走啊
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发表于 2012-5-24 00:02:37 | 显示全部楼层
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发表于 2012-8-23 03:00:29 | 显示全部楼层
学习了      。
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发表于 2012-8-23 18:50:48 | 显示全部楼层
太需要这样的资料了,类似指南针、地图之类!
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发表于 2012-10-4 09:44:27 | 显示全部楼层
赞一个!!!!!!!!!!!!!!
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发表于 2012-10-4 10:36:03 | 显示全部楼层
保持一颗平常心,戒骄戒躁,平和的埋头学习2 R5 p* D  l/ w3 s# e
学习了
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发表于 2012-10-4 16:51:40 | 显示全部楼层
,让我这个大二软件新生对前途有点清晰了
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发表于 2012-10-5 00:00:46 | 显示全部楼层
说的不错 。 但是编译原理的还一个最重要的作用就是优化代码 。
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发表于 2012-10-5 08:43:12 | 显示全部楼层
顶一个{:1_1:},学习
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发表于 2012-10-5 18:07:01 | 显示全部楼层
说的不错!
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发表于 2012-10-6 00:11:22 | 显示全部楼层
我在学计算机的自考课程  按照前言排了一下序 大致的顺序是 硬件方面 先学的电子技术 然后是计算机组成原理 之后是微机及接口和网络技术 软件方面 先学计算机应用 然后是语言 再往后是数据结构 - T; l1 a6 x# D3 |1 i! u; c( |
上面软件 硬件都学完了 最后学操作系统,,,,
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发表于 2012-10-6 12:09:36 | 显示全部楼层
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