化学

Recently, crystal engineering of coordination polymer and supramolecular chemistry has become one of the particularly important and topical subjects, and also there are potential applications in the fields of medicine, absorption and selective catalysis, nonlinear optical and magnetic materials.

配位聚合物和超分子化学的晶体工程已成为近年来化学研究的热点领域之一，且在医药、吸附与选择性催化、非线性光学与磁性材料等方面显出潜在的应用价值。

In summary, apoptosis is not only a good explanation to the chemopreventive effect of selenite, but also provide chances for using this compound in conlon cancer treatment.

综上所述，细胞凋亡不仅是解释亚硒酸钠化学预防作用的重要机制，也为其在结肠癌化学治疗的应用可能性上提供了初步的依据。

Commencing from the teaching of common chemistry concept, this topic investigated the function of self-explaining in the teaching of chemistry concept, focusing on exploring whether there exists certain correlation between the level of the students" self-explanation and their academic performances, then tested the variety circumstance of level of students" self-explanation and academic performances after carrying out some training on self-explanation capability. Meanwhile, analyses were made on the exaltation degree to which ths students could improve their academic performances after being trained.

本课题从平常的化学概念的教学入手，探索自我解释(self-explaining)在化学概念的教学中的作用，着重探索了自我解释水平与学生学科成绩间是否存在一定的相关性，进而在通过实施一些自我解释能力的训练后测试学生自我解释水平和学科成绩的变化情况，同时对不同学生经过自我解释能力的训练后的学科成绩的提高程度作了分析。

The separation ability of semipermeable membranes needs to be understand from a molecular point of view for applications in the life sciences, chemistry, and chemical engineering.

从分子水平上研究半透膜的性质在生命科学、化学以及化学工程中有着重要的作用。

Compound 3 was obtained from Senecio kaschkarovii for the first time and, Compound 4 is a new compound. Compound 4s absolute configuration had been determined by CD, NMR and NOE.

通过CD谱及NMR、NOE差谱研究了化合物4的立体化学，并按Dreiding models构筑了该化合物分子的立体化学结构，确定该化合物应为Non-steroid型构象。

This paper presents the chemical-adsorption behavior of crystalline grains of silver chloride used as a new type (i.e.,JA-2 type) chemisorbent of bromide ion in sea water.

这是因为三溴苯胺法、Ethyl-Dow法和迭经改进的空气吹出法，都是先把海水泵提入反应塔，添加大量的化学试剂预行酸化，然后进行一系列的化学加工处理。

The compounds may be added to the silver halide emulsion at any time during or after chemical sensitization.The silver halide emulsions utilized in this dioxide may be comprised of any halide distribution,and optimally greater than about 95 mole percent silver chloride.

原则上讲可以在乳剂制备过程中的任何时间加入到卤化银乳剂中，但最好是在化学增感期间或者化学增感之后加入，卤化银乳剂可以由任何卤化物组成，但最好是含AgCl为95％以上的乳剂。

The principle of chemical reclamation of sodium silicate sand through cognition of harden mechanism is presented.

介绍了水玻璃旧砂湿法、干法和热法再生原理，并简要说明了其应用情况；阐述了水玻璃旧砂化学再生的基本原理，并对水玻璃旧砂化学再生方面的研究及应用情况进行了论述。

In this paper, chemistry composition, fiber morphology and pulping property in Solidago canadensis were analyzed and determined preliminarily. The results showed that the content of holocellulose was 81.86%, the content of cellulose was 42.63%, the content of lignin was 18.86%, it is feasible for using Solidago canadensis pulping based on it's chemical composition. The ratio of fiber length to width in Solidago canadensis was 36.67, the average length of fiber was 440 μm, and the length of fiber was too short to pulping. The ratio of wall thickness of fiber cell to lumen diameter was 0.34, and it was smaller than that of other woody fiber. In this experiment, four different methods of pulping were as follows: kraft-AQ pulping Ⅰ, kraft-AQ pulping Ⅱ, alkaline pulping, alkaline sulfite adding AQ pulping, but it was difficult for lignin removal in Solidago canadensis.

通过对一枝黄花的化学组成、纤维形态以及制浆性能进行初步探索，结果表明：(1)加拿大一枝黄花的综纤维素含量为81.86%，硝酸乙醇纤维素含量42.63%，木素含量18.86%，由化学组成看，加拿大一枝黄花是比较适宜制浆造纸的；(2)加拿大一枝黄花纤维的长宽比为36.67，纤维平均长度为44μm，从纤维长度来看，加拿大一枝黄花的纤维较短，不适宜制浆，其纤维壁腔比0.34，和其它速生材相比较小；(3)采用4种碱法制浆方案，硫酸盐蒽醌法Ⅰ，硫酸盐蒽醌法Ⅱ、烧碱法、碱性亚钠＋蒽醌法，结果显示，加拿大一枝黄花的木素非常难脱除。

The function mechanism among the minerals and floatation drugs had been studied with the way of IR and academic calculation, which pointed out that absorption of G-4 on the surface of phosphorite belonged to physical and chemical types, but the chemical one was in the highest flight. Absorption of amine collector named GE-609 on the surface of quartz belonged to electrostatic and physical type. Distilled water could hardly wash the GE-609 down from the surface of quartz. Leading component of S-721 was the concentrated compound of naphthol sulfonic acid and formaldehyde. The compound had a stronger affinity to the Mg~(2+) on surface of dolomite than the Ca2+ on surface of phosphorite, which is the essential reason in the separation of phosphorite and dolomite. The leading components of soluble glass in function were HSiO3 hydronium and F^SiC^ colloid granule.

通过红外光谱测定以及理论计算的方法研究了选矿药剂与矿物间的作用机理，研究表明：脂肪酸捕收剂G-4对胶磷矿的捕收作用是以化学吸附为主、化学吸附与物理吸附共同作用的结果；胺类阳离子捕收剂GE-609在石英表面的吸附属于静电物理吸附，但很难用水洗的方法使GE-609从石英表面脱附；S-721主要成分为萘酚磺酸与甲醛的缩合物，萘酚磺酸与甲醛的缩合物对白云石表面Mg~(2+)的吸附明显强于对胶磷矿表面Ca~(2+)的吸附，这是胶磷矿与白云石分离的根本原因；水玻璃溶液中对石英起抑制作用的主要组分是HSiO_3~-和H_2SiO_3胶粒，水玻璃除对石英起抑制作用外，对矿浆还具有一定的分散作用。

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％。