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Researchers say they have found a way to extend the storage life of a drug used to treat H.I.V.
VOA: special.2010.05.24
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So, I just want to write a few examples down with a few values for delta u or delta H or delta S, and see whether we can get any clues from what we see.
我先写一些例子,例子包含一些内能，自由焓和熵的变化数值，然后看从中,我们能不能得到一些启示。
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C H 3 So any time you see c h 3 here, remember that that's methyl and that's going to be a terminal group.
因此一旦你看到，记得这就是甲基,而且只能在结构的末端。
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In Kenya,a project aims to educate girls about H.I.V.prevention while helping them stay in school during their monthly periods.
VOA: special.2009.03.16
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This is equal to zero. So this irreversible process this Joule-Thomson process, is a constant enthalpy process. Delta h for this process is equal to zero.
等于0。所以这个不可逆过程,也就是焦耳-汤姆逊过程,是一个等焓过程。
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He says Poe's influence can also be seen in the work of H.G.Wells and Alfred Hitchcock,to name a few.
VOA: special.2009.02.02
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So I show that here, so in green, you have what's called a carboxcylic acid group, a c o o h, which gets converted by s o c l 2 to a c double bond o c l or an acid chloride.
我在这里用绿色表示，我们所说的羧酸族化合物，碳，氧，氧，氢，它被亚硫酰氯转化为,一个碳氧双键与碳氯单键组成的酰氯。
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Mark Hurd was out. Investigators said he had falsified expense records to hide spending on a woman who worked with H-P.
VOA: special.2010.08.13
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So, in talking about covalent bonds, we should be able to still apply a more general definition of a chemical bond, which should tell us that the h 2 molecule is going to be lower in energy than if we looked at 2 separate hydrogen atom molecules.
那么，既然提到了共价键，我们应该还可以,给化学键下一个更普遍的定义,那就是告诉我们氢分子能量应该更低,与两个分开的氢的单原子分子相比。
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Also in Kenya, a video game is being tested as another way to teach young people to avoid H.I.V.
VOA: special.2009.03.16
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So it looks a lot less messy if we just draw our Lewis structure like this for h c n, where we have h bonded to c triple bonded to n, and then a lone pair on the nitrogen there.
这看起来整洁了不少,如果我们把氰化氢的路易斯结构画成这样的话，这样我们就有氢与碳之间的单键和碳与氮之间三键，然后还有一对孤对电子在氮这里。
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That way,H.I.V.-infected women could have plenty of time to get the pouch from a health care provider early in their pregnancy.
VOA: special.2010.05.24
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In some sense, that's one reason to associate this as a kind of energy, H just like mechanical energy u or enthalpy H, it's the minimum free energy state that is the equilibrium state under the relevant conditions.
在某种意义下，这是我们把这些物理量称为能量的原因，就像机械能U和自由焓，具有最小自由能的状态在特定的条件下,就是平衡态。
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And a program in Peru sends text messages to patients with H.I.V., reminding them to take their medicines.
VOA: special.2010.05.03
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The more important thing that I want you to notice when you're looking at this wave equation for a 1 s h atom, is the fact that if you look at the angular component of the wave function, you'll notice that it's a constant.
我要你们注意的,更重要的一点是,当你们看到,这个氢原子1s轨道方程的时候，如果你们看,波函数，的角向部分，你们会发现它是一个常数。
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Her work "Variations on H" is made up of different colors of finely made hands connected together to form a flowing cloth.
VOA: special.2009.11.04
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W.H.O.Director-General Margaret Chan declared the sickness a pandemic a disease that has spread to many nations.
VOA: special.2009.07.14
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AIDS researchers say they still have much work to do on a vaccine against H.I.V.
VOA: special.2009.09.30
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For example,a W.H.O.statement urged nations not to close their borders or limit trade and travel.
VOA: special.2009.07.14
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The experts at N.I.H.say you may have to repeat this process a few times.
VOA: special.2010.03.31
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The W.H.O.says the international community is now in a position to defeat malaria.
VOA: special.2010.04.20
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Sixty-five thousand H-1Bs are awarded each year to graduates with a bachelor's degree.
VOA: special.2009.07.02
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This month,the W.H.O.joined with other groups to announce a new effort against malaria.
VOA: special.2009.05.26
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Foreign graduates need a job offer to get an H-1B visa.
VOA: special.2009.07.02
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"We can't affirm that exposure to pesticides is causing A.D.H.D.
VOA: special.2010.05.26
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