查询词典 O

Al〓O〓-TiC and Al〓O〓-TiB〓 ceramic composites were synthesized using TiO〓, Al and graphite and TiO〓, Al, and amorphous B〓O〓 powders via aluminothermic reactions, respectively.

采用TiO〓、Al和石墨原料合成了Al〓O〓-TiC复相陶瓷，研究了压坯压力、试样直径、原料中铝粉和石墨颗粒、TiO〓的晶型、过量铝和Al〓O〓稀释剂等对燃烧合成过程及产物微观结构的影响。

The experiments showed that polypeptides were formed by self-assembly of N, O- bis amino acids with the assistance of o-phenylene phosphoro- chloridate. Three steps were involved in the self organization reactions, i.

侧链无官能团的N，O-二-α-氨基酸在O，O-亚苯基磷酰氯辅助下能自组装得到系列2～n聚寡肽，其自组装成肽过程大致分为三步：氨基酸的活化、肽链的延长和链反应终止。

In order to check the corresponding compound at 31P NMR –45.4 ppm, stable pentacoordinate spirobicyclic 2-phenoxy-1,3-phenylene-dioxo-1,3,2-iminoacetoxyphosphoranes were synthesized through a new and efficient method whereby phosphorus pentachloride was displaced stepwise by catechol, N,O-bisamino acid and phenol, or catechol, phenol and N,O-bisamino acid, their 31P NMR chemical shifts are at about 31P NMR –45.0 ppm, the results showed that the compound 4 at 31P NMR –45.4 ppm was pentacoordinate phosphorane containing amino acid residue.

采用磷谱跟踪来研究上述成肽反应机理。例如在氮气保护下，0.1mmol O，O-亚苯基磷酰氯（1）和0.15mmol N，O-二苯丙氨酸（2）苯溶液加入0.6ml核磁管中，混合均匀，反应过程用磷谱检测。反应1分钟后，起始原料1(δp=19ppm)很快转变成N-磷酰苯丙氨酸的三甲基硅基酯（3）(δp=19.8ppm)，在8分钟内，3完全转变成苯丙氨酸磷烷4(δp =-45.4ppm)，同时出现环磷三酯（6）(δp=3.5ppm)。随着反应的进行，对应于化合物4的峰逐渐变小，而6逐渐变大。

On the basis of spectroscopic analysis and comparison with the reported data, they were identified as kaempferol-3-O-β-D-glucoside, kaempferol 3-O-β-D-6-p-hydroxycoumaroylglucoside, L-2-O-methyl chiro-insitol and phillyrin.

叶的95%乙醇提取物中分离得到了4个化合物，经波谱分析，其结构分别鉴定为山萘酚－3-O-β-D-葡萄糖苷、山萘酚－3-β-D-（6-对羟基桂皮酰基）葡萄糖苷、L-2-O-甲基－手－肌醇和连翘苷。

Oakley O ROKR features lightweight O Matter frame, buttons for controlling volume, answering/ending calls and controlling music, lenses made of optically pure PLUTONITE which filter out 100% of all UVA, UVB, UVC and harmful blue light up to 400nm, able to change the lenses, and ability to use O ROKR with iPod by adding the optional ICOMBI adapter.

厂商Oakley o ROKR的特点轻量级o问题的框架，按钮控制音量，接听/结束通话及控制用音乐，镜头作出的光学纯plutonite ，其中筛选出100 ％的所有紫外线A ，紫外线B ，紫外线C和有害的蓝灯高达400 nm ，能改变镜头，有能力使用Rokr手机与iPod加入任择icombi适配器。

A multimedia file I/O service provides buffered and unbuffered file I/O.It also supports the standard IBM /Microsoft Resource Interchange File Formatfiles.These service are extensible with custom I/O procedures that can be shared among applications.

提供有缓冲和无缓冲的文件I/O，它还支持标准的IBM/Microsoft资源交换文件格式文件，这些服务还可由用户I/O过程扩展并在应用程序间共享。

We have proven that the accumulation of superoxide will be dangerous by disproportioning to other deleterious ROS such as H〓O〓 and ·OH, although superoxide is less harmful than singlet oxygen because of the capability of artificial quinone to partially prevent PS Ⅱ reaction center complexes from photodamage.

发现受到光抑制破坏的PS Ⅱ仍能生成O〓，尽管重组醌对PS Ⅱ反应中心复合物的保护作用表明O〓对PS Ⅱ的破坏性可能不如单线态氧强，但它可以通过诱发生成的其它活性氧物种，如H〓O〓和·OH等，导致对PS Ⅱ造成显著的破坏，因而过多的O〓生成对高等植物是有害的。

By using nucleation theory, the undercoolings at which the primary crystal of Al-4. 5%Cu alloy nucleates on γAl〓O〓 and α-Al〓O〓 are determined to be 59～83℃ and 23～33℃ respectively, This theoretical result agrees with our experiments.

发现工业大体积Al-4.5％Cu合金的最大过冷度受其在Al〓O〓上形核过冷度的限制，并用形核理论估算出Al-4.5％Cu合金液在γ-Al〓O〓和α-Al〓O〓上的形核过冷度分别为59～83℃和23～33℃。

Not only did the algorithm go from O to O from a theoretical point of view, but, because we chose to hold in the auxiliary dictionary data that is sparser from the point of view of the task at hand, we've made the solution faster than the alternative which would also be O

不仅从理论上算法O 变成 O ，而且，从任务便利来看，因为我们选择保持在辅助字典的稀疏的数据，我们做了一个比原来更快的解决方案。

XRD results indicated the formation of aluminates on the supported samples calcined at high temperatures, which prevents the transformation ofγ-Al〓O〓 toθ-Al〓O〓 and α-Al〓O〓.

吸附量热结果表明，600℃焙烧的6％K〓O/γ-Al〓O〓具有很强的碱性，且表面积达到160m〓/g，为很好的固体碱催化剂。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。