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He absorption peaks of ferrocene and acetyl ferrocene in polar and nonpolar solution change whenconcentration and temperature change.

作者对二茂铁、乙酰二茂铁在极性和非极性溶剂中吸收峰随浓度及温度的变化进行了研究。

It is existed competitiveness inhibition of 6APA, non-competitiveness inhibition of PAA and substrate inhibition of Penicillin on the hydrolysis of benzylpenicillin to 6APA and PAA by an immobilized penicillin amidase. The heat conductive coefficients were determined on the vacuum elevation liquid membrane concentration. The thermodynamics and kinetics of PAA extraction were studied on the organic solvent extraction of the above solution.

研究证明固定化青霉素酰化酶裂解反应是典型的底物、产物抑制酶反应,其反应动力学数据表明,青霉素、苯乙酸以及6APA对反应分别存在底物抑制、非竞争性抑制和竞争性抑制;真空升膜浓缩适应热敏性以及粘度不大的物系,对于6APA水溶液的真空升膜浓缩过程研究得到了浓缩实验的传热系数;浓缩液萃取主要是提取出其中的苯乙酸,本文测定了不同温度以及溶剂条件下的苯乙酸溶解度,并观测了苯乙酸萃取动力学。

By the present of DMF, attractions arising from hydroxyl groups increase, repulsions arising from apolar side-chains have little change.

混合溶剂中DMF的存在,使含-OH的极性侧链间的吸引作用增强,而对非极性侧链间的排斥作用影响不大。

The results of DPBMN in n-hexane solution show that there are two non-radiative processes occurring in the local excited state. The decay time constants of ~4 ps and ~ 220 ps are due to vibration relaxation and intersystem crossing processes respectively.

实验结果显示DPBMN分子在非极性溶剂中的区域性激发态(local excited state,LE state)有两个非辐射缓解的过程发生,首先为发生在LE能阶的振动缓解(~ 4 ps),之后为系统内转换的过程(~ 220 ps)。

The magnetite with a mean diameter of 8nm was prepared by chemical coprecipitation methods. By the addition of nonionized oleic acid to the suspension of magnetite in solution during precipitation, the magnetite nanoparticles were coated with a double surfactant layer. A gel-like precipitated precursor is then formed because of the hydrophobic interaction among those coated units. By transferring of this precursor to an organic solvent, the surfactant double layer on Fe〓O〓 nanoparticles reduces to one; however, it still remains as a double layer by transferring to an alkaline aqueous solution. Both these cases give in stable colloids of superparamagnetic Fe〓O〓 nanoparticles.

从解决无机磁性Fe〓O〓颗粒与有机烯类单体的相容性入手,采用化学共沉淀法,制备了平均直径为8nm的超顺磁性Fe〓O〓颗粒,在制备过程中以非离子形式引入油酸,在Fe〓O〓颗粒表面形成一个具有双层结构的疏水外壳,并通过疏水相互作用凝聚成磁性Fe〓O〓凝胶,能够以单分子层结构形式溶解在非极性溶剂中,也能够以双分子层结构形式溶解在碱性水溶液中,形成稳定的超顺磁性Fe〓O〓溶胶。

The effects of reaction temperature and solvent on alkanes catalytic oxidation and the reusable of heterogeneous catalyst are also investigated.

本文还考察了反应温度和溶剂效应对烃类均相及非均相催化氧化反应的影响以及非均相催化剂的重复使用性能。

Transition metal borides and inorganic boron-containing compounds, such as TiB〓, BN, B〓C and BP, are one of the most important groups for application in high-temperature performance, electronics and catalysts. Traditionally, they were prepared by high-temperature reactions; however, the products were beyond nanometer scale.

中文题名溶剂热合成硼化物及非金属含硼化合物纳米材料副题名外文题名论文作者谷云乐导师钱逸泰学科专业无机化学研究领域\研究方向学位级别博士学位授予单位中国科学技术大学学位授予日期2003 论文页码总数70页关键词纳米材料硼化物溶剂热合成馆藏号BSLW /2003 /O613 /6 硼化物、非金属含硼化合物功能材料(如硼化钛、氮化硼、碳化硼和磷化硼等)通常具有高硬度、高熔点、机械强度大、高温化学稳定性好等一系列优良性能,有些还具有奇异的光、电、磁、热学性能和催化活性,是一类最富潜力的非氧化物高温结构材料、电子材料和催化材料。

Solvent extraction usually gives high yields of aroma compounds with easy operation; but there are many disadvantages, such as the loss of more volatile compounds in the process of solvent removal, the contamination of GC due to high-boiling and non-volatile materials in extracts.

溶剂萃取操作简单,香味化合物的收率高;但存在许多缺点,如除去溶剂的过程可能会造成许多挥发性成分的损失,萃取物中通常含有高沸点以及非挥发性的成分,对GC仪器造成损害等。

Because a part of hydroxyl group in methyl cellulose were substituted by trimethylsilyl group , the product could be dissolved in amounts of common organic solvents, such as chloroform, xylene and so on.

通过甲基纤维素与六甲基二硅亚胺的反应,成功地实现了对水溶性物质甲基纤维素醚三甲基硅化的改性;红外光谱验证了反应的发生,核磁共振氢谱确定了三甲基硅甲基纤维素的取代度;纤维素醚上的部分羟基被三甲基硅化后取得了在普通溶剂中的良好的溶解性,且随着取代度的增加,在非极性溶剂中的溶解性逐渐变好;通过热失重实验,对其热稳定性进行了测试。

This is because that the solvent polarity affects ICT process in two ways: on the one hand, the ICT state is better solvated in more polar solvent, which favors the ICT process; whereas on the other hand, the rates of non-radiative decay and intersystem crossing of the ICT state are increased, which unfavors the ICT process.

这是因为溶剂极性增大,一方面ICT态被更好地溶剂化,ICT过程活化能降低,有利于ICT过程的发生;另一方面ICT态非辐射跃迁和系间窜跃速率增大,导致ICT荧光猝灭。

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