机理

In theory, the mechanism of electric current conduction in the polymer materials have been studies for a long time, but there is still not a satisfactory explanation for PTC effect and conductivity and some of conductive mechanism still remain controversial.

在理论方面，虽然聚合物基PTC材料的导电机理已被研究了很长时间，但是对PTC现象和导电性仍不能获得满意的解释，一些导电机理还存在相互矛盾的现象。

The mechanism of FPCL contraction proves the theory of "traction".

FPCL收缩的机理支持了有关伤口收缩机理的&牵拉&理论。

To approach its" mechanism of action, we carded out this experiment. The SD rats were objects in this experiment. We made rat focal cerebral ischemia model with middle cerebral artery occlusion using a thread block technique. We gave a mark of the neurologic impairment in rat and detected the contents of calcitonin gene-related peptide and neuropeptide Y in rats" cornu ammonis and brain mantle respectively by electro-acupuncture on shuigou(DU 26) acupoint. In this way, we are trying to explore the mechanism of acupuncture therapy in cerebral ischemia.

为了进一步探讨其作用机理，本实验以SD大鼠为研究对象，采用线栓法制作大鼠局灶性脑缺血模型，运用电针水沟进行治疗，并对大鼠神经功能缺损进行评分，检测了大鼠海马及大脑皮质降钙素基因相关肽以及神经肽Y含量，从中枢神经肽类递质的变化探讨电针抗脑缺血损伤的作用机理，为临床治疗缺血性脑血管疾病提供实验依据。

The resistant mechanism of cotton aphid to insecticide is relevant to many factories .Such as the susceptibility of target reducing and activity of detoxify enzyme, etc.

棉蚜对杀虫剂的抗性机理涉及到靶标敏感度下降、体内解毒酶系活力升高等多种机理。

Aim\ To study the SAR imaging of ocean surface wave and the surface wave modulation of radar cross section.

目的 研究合成孔径雷达对海面波成像的机理和海面波对雷达截面的调制机理。

Under the working conditions of alkaline zinc electrodes and in the range of charge and discharge potential, the composite inhibitors were proved to have good chemical and electrochemical stability themselves, and to keep their effect for a long time.

最后，通过双电层电容的测量、电化学阻抗谱、稳态极化曲线和红外光谱的分析，提出了复合代汞缓蚀剂的吸附行为理论、缓蚀作用机理和协同作用机理，很好地解释了实验的结果，并为进一步选择、设计复合代汞缓蚀剂提供了理论基础。

EXPERIMENT 1 Objective To study the regularity of the injury of the mice learning and memory ability, after the whole brain irradiation. Method After anaesthetized with thiopentone, the whole brain of Kunming mice was irradiated with 10MeV electron beam. Mouse learning and memory ability were measured with step down method on the first, second, third, fourth, fifth, fourteenth, twenty-eighth, fifty-sixth and eighty-fourth day after the irradiation.

随着现代放疗技术及计算机、分子生物学等相关学科的快速发展，肿瘤疗效逐步提高，脑等晚反应组织的放射损伤越来越受重视，因而有必要采用动物实验及分子病理学手段，深入研究放射性脑损伤的发病机理和早期症状，以及活血化瘀中药的防治作用，为此我们设计并完成了学习记忆力放射损伤规律、脑室管膜下区细胞凋亡及相关基因表达、中药防治放射性脑损伤及分子机理三个实验，介绍如下：实验一目的研究照射后鼠学习记忆力损伤变化规律。

Characteristic analysis of the highly active absorbents was studied, furthermore the mechanism of preparation and removal SO2, NOX was investigated.

论文对高活性吸收剂进行特性分析，探讨了高活性吸收剂的制备机理和脱硫脱氮机理。

Corrosion mechanism of concrete exposed to bitterns containing Mg2+-Ca2+-Cl--SO42- was extended to bitterns containing Mg2+-Cl--SO42--CO32--HCO3-.

将混凝土的Mg2+-Ca2+-Cl--SO42-复合型腐蚀机理扩展到Mg2+-Cl--SO42--CO32--HCO3-复合型腐蚀机理。

In the second part, quantum chemical AM1 methods were employedto theoretically investigate the electronic structures of maleic anhydride in ground- and excited-states. On basis of the frontier orbital theoryand three bonding principles, the possibility of reaction of active α-hydroxysuccinic anhydride carbanion and active α-hydroxy-succinic anhydride radical on polymerization process of MArespectively by alkali catalyst and by hydroxyl radical was discussed. Theanionic and radical polymerization of MA discussed also. Theoreticalstudies show that both polymerization products of MA are in the chainstructures, corresponding to the experimental findings.

第二部分用量子化学AM1方法，计算研究了马来酸酐的基态和激发态电子结构；应用前线轨道理论和成键三原则分别探讨了碱催化条件下和羟基自由基引发下马来酸酐均聚合过程中α-羟基丁二酸酐碳阴离子和α-羟基丁二酸酐碳自由基活性中间体参与反应的可能性及由它们引发的马来酸酐阴离子聚合反应机理和自由基引发聚合反应机理；理论研究表明马来酸酐的均聚合产物均为链式结构，与实验事实相相符。

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％。