查询词典 hydrogen

LX series desulfurizers are synthesized by secondary amine, formaldehyde and at least oneactive hydrogen compound (amine, alcohol, phenol, et al.), which is an aminomethylationreaction. This synthesis route of desulfurizers has the advantage of moderate reaction conditionand inexpensive raw material.

采用仲胺、甲醛和带有活泼氢的化合物进行缩合反应合成LX系列脱硫剂，此合成路线具有反应条件温和，原料价廉易得的特点。

Very good results were obtained in logP modeling for carboxylic acid, ethanol, phenol, aldehyde, ketone, ether, ester and amine. A QSPR model of logP for many kinds of substances was established by multi-linear regression with the first-order molecular connectivity valent index 〓 and the number of hydrogen bonds N as two patameters.

利用这两类结构参数，分别建立了脂肪族羧酸、芳香族羧酸、醇、酚、醛、酮、醚、酯、胺类物质的疏水性常数定量模型；在此基础上，建立了包含8类基本有机物144种物质的疏水性常数的定量模型，并提出logP的简化模型。

Kinetics of hydroxyl-terminated polybutadiene/ phenyl isocyanate, bonding agent (BA-5)/PI and antioxidant H/PI were studied in toluene/dimethyl sulphoxide solution. The rate constants and the activation parameters were calculated. The results show that the reactionary rate of these three active hydrogen components decreased in same condition.

分别对端羟基聚丁二烯/苯异氰酸酯，键合剂(BA-5)/PI和防老剂H（N，N'-二苯基对苯二胺）／PI在甲苯／二甲基亚砜混合溶液体系中进行了反应动力学研究，计算了相应体系的反应速率和活化能。

Fe〓 and nascent hydrogen that results from reduction of water at the iron surface may be not the main reductants.

溶液中的二价铁离子和零价铁与水溶液接触所产生的氢气对反应的影响不大。

Pettini and his colleagues found that these three sets of lines were redshifted by different amounts: the heavy elements by less than the galaxy , the hydrogen by more.

佩提尼及其同事发现这三组谱线的红移程度不同：重元素不及星系，氢则超过。

UV absorptions of the complexes are redshifted compared with those of the monomers owing to the less LUMO-HOMO energy gap. IR frequencies of N-H bonds in the complexes are lessened due to the formation of hydrogen bonds.

LUMO-HOMO能隙的减小使电子光谱吸收峰发生红移，氢键的形成削弱了单体原来的N-H键，使红外振动频率变小。

With the aid of 〓P NMR examination for the process and ESI-MS/MS analysis of the derivatized products from the reaction intermediate, it is found that the corresponding phosphoryl chloride is generated after mixing the hydrogen phosphonate derivative with chlorodiisopropylamine, and they react with amino acid, amino acid methyl ester, dipeptide methyl ester or N-methyl imidazole carboxyl alkyl diamine respectively to form the desired products.

利用〓P NMR对反应过程监测以及对反应中间体衍生化后产物的ESI-MS／MS检测分析发现，氢亚磷酸二酯与氯代二异丙胺反应首先生成了磷酰氯中间产物，它继续与氨基酸、氨基酸甲酯、二肽甲酯、1-甲基咪唑-2-酰基烷基二胺等反应生成了目标产物。

Objective To investigate the protective effect and mechanism of erythropoietin on injury of human retinal pigment epithelial cell induced by hydrogen peroxide (H2O2). Methods Take subcultured hFRPE cells as study target.

目的 观察促红细胞生成素对人视网膜色素上皮细胞抗过氧化氢（H2O2）损伤的影响。

The hydrogen bonding and π-π interactions between the chiral stationary phase and the polar group of racemates may be responsible for the chiral recognition.

手性固定相与外消旋样品上的极性基团之间的氢键作用和π-π作用可能是进行手性识别的主要原因。

Successful ethylene ignition and sustained main stream combustion is achieved with normal fuel injection and taking hydrogen as pilot flame.

采用从壁面垂直主流喷射燃料和以氢作为先锋火焰，实现了乙烯燃料的可靠点火和稳定燃烧。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48