化学

In the present work poly is prepared by chemical vapor deposition polymerization from [2.2] paracyclophane. Thermal gravimetrical analysis is used to study the thermal degradation. It is found that the onset of thermal degradation of poly in air is much lower than that in N2 due to the existence of O2 in the air.

用化学气相沉积聚合法制备了聚对亚苯基二亚甲基膜，由傅立叶变换红外光谱图证实了其化学结构采用热重分析研究了PPX的热降解性能，结果表明，在空气氛围中由于氧气的参与，其热稳定性比在N2中差，热氧化降解明显。

In addition, based on a project case under water-inrush hazard, the field experiment has also been carried out; contrasted to other types of grout, such as cement with super fine slag, cement and water glass double grouts, and urea resin harnstoffharz, the applications and advantages of this chemical grout on inrush of high-pressure water controlling has further been proved.

以深部地下工程的加固和高压突水治理为研究对象，对一种新型化学注浆材料的化学反应封堵机制进行了可行性分析，并针对化学浆液的流动性、渗透性、抗冲刷性以及固结体的强度、水质毒理等因素进行了室内试验研究，详细地分析了浆液的物理化学特征，给出了浆液最佳配比值以及相应的性能指标。

Domestic and foreign has conducted extensive research to the phytoparisite process, quininones, the hydroxyl acids and flavonoids are identified as haustorial inducing factors in the perception of the host plants.

国内外对植物寄生过程进行了广泛的研究，普遍认为醌类、类黄酮类、酚类3大类化学物质为植物寄生过程中的化学信号物质。

In this research, we made use of classical histochemical methods and simple immunohistochemical methods.

本论文完全利用传统的组织化学染色和简单的免疫组织化学染色来进行研究及评估。

Methods The study was carried out by using the common and special histochemical staining.

用组织化学和特殊组织化学染色观察。

Samples were extracted 6 and 12 weeks after operation for histological, histochemical and immunohistochemical analysis.

术后 6周和 12周分别处死动物、取材，进行缺损区大体、组织学、组织化学和免疫组织化学分析。

The organic/inorganic composites, as new materials that combine the inorganic phase"s rigidity,stability and the organic phase"s toughness and workability, have important theoretical and realisticsignificance in materials science. C_(60) is a brand-new holosymmetry spherical molecule with theunique physical and chemical property, displaying wide implications and applications of physics,chemistry, biology, materials science, medicine, electronics, and so on.

有机／无机复合材料集无机相的刚性、稳定性和有机相的韧性、加工性等诸多特性于一体的一类新型材料，具有重要的理论和现实意义。C_(60)是一个全新的全对称球形分子，具有独特的物理、化学性能，已广泛地影响和应用到物理、化学、生物学、材料学、医学、电子学等许多领域。

Analysis of the spectrum obtained by means of homonuclear H,H-correlation spectroscopy revealed a coupling between the methylene group with a chemical shift of 2.08 ppm and the methylene group at 2.42 ppm as well as the proton at 3.76 ppm, as expected for a glutamic acid moiety.

作为独立的肽中一部分的亮氨酸和亮氨酸基之间的区别可以通过将13C 化学位移和从其它单个氨基酸中获得的化学位移进行对比后得出。

However, due to the very short lifetime and extremely low concentration in the atmosphere, direct measurement of HOx radical is one of most challenged works in atmospheric chemistry.

但是HOx的化学寿命很短、浓度极低，它们的测量是迄今为止大气化学领域最富挑战性的工作之一。

However, due to the very short lifetime and extremely low concentration in the atmosphere, direct measurement of HOx radical is one of most challenged works in atmospheric chemistry.

由于HOx化学寿命很短、浓度极低，使其测量成为迄今为止大气化学领域最富挑战性的工作之一。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。