氧化锌

Firstly, D,L-lactide was synthesized from D,L-lactic acid with zinc powder as catalyst,and glycolide from glycolic acid using Sb2O3 as catalyst.

首先以乳酸为原料，锌粉为催化剂合成了丙交酯；以乙醇酸为原料，三氧化二锑为催化剂合成了乙交酯。

As a part of this key program from China Natural Science Foundation, this research focuses on the electrochemical reactions and oxidization products on the surfaces of jamesonite and marmatite, and on the change of their interfacial structures and their electrochemical mechanisms by various methods of thermodynamic, electrochemistry (such as Tafel, constant potential step, cycle voltammetry, AC impedance) and IR, UV spectra when the collectors, adjusting reagents act with the sulfide minerals in the flotation system so that the electrochemical conditions to float selectively the minerals can be decided.

本研究作为该国家自然科学重点基金项目的一部分，采用热力学、电化学(Tafel、循环伏安、恒电位阶跃和交流阻抗法)以及光谱等多种研究手段，集中研究了浮选体系中脆硫锑铅矿、铁闪锌矿表面的电化学反应及氧化产物，研究这两种矿物与捕收剂、调整剂相互作用时的界面结构变化及电化学机理，阐明了使药剂选择性捕收或选择性抑制这些硫化矿物的电化学条件。

The electrochemical oxidation of marmatite should not be neglected in the sulfuric acid leaching.

在铁闪锌矿硫酸浸出过程中，其电化学氧化作用不容忽视。

Water, Kaolin, Montmorillonite, Stearic Acid, Cetyl Alcohol, Glycereth-26, Glyceryl Stearate, Peg-100 Stearate, Aloe Barbadensis Leaf Juice, Triethanolamine, Titanium Dioxide, Menthyl Pca, Lauryl Pca, Fragrance, Diazolidinyl Urea, Propylene Glycol, Ethoxydiglycol, Methylparaben, Citric Acid, Panax Ginseng Root Extract, Zinc Pca, Copper Pca, Yellow 5, Blue 1

水，高岭土，蒙脱土，硬脂酸，鲸蜡醇，Glycereth-26，甘油硬脂酸酯，培格100硬脂酸，芦荟叶汁，三乙醇胺，二氧化钛，薄荷醇，香料，尿素醛，丙二醇，乙氧基二甘醇，对羟基苯甲酸甲酯，柠檬酸，人参精华，锌，铜，黄色5#，蓝色1#。

Secondly, the silver based catalysts modified by phosphorus, zirconium, zinc, potassium and so on using molecular sieve as carrier, which were produced by ion-exchange method, had also good catalytic performance for 1,2-propane glycol oxidation to methylglyoxal. The conversion of 1,2-propane glycol and the selectivity of methylglyoxal were both high, and the impurity such as formaldehyde and acetaldehyde in the product is little. At the condition of the temperature 300 ℃, the molar ratio of oxygen to 1,2-propane glycol 1.7:1, the space velocity 6000h~(-1), and the concentration of 1,2-propane glycol 70wt%, the conversion of 1,2-propane glycol is 90% and the selectivity of methylglyoxal is 45% on the Ag-P catalyst.

其次对采用离子交换法制备的负载在分子筛上的银系催化剂进行了研究，发现此催化剂在助催化剂磷、锆、锌、钾等的作用下对丙二醇的低温氧化脱氢具有很高的活性，可以得到较好的丙酮醛的收率，并且产物中的甲醛、乙醛副产物的量比较低；经过对Ag-P催化剂上反应条件的考察，发现当温度为300℃、氧醇比1.7：1、空速6000h~(-1)、丙二醇浓度为70wt%时，丙二醇的转化率为90%，丙酮醛的选择性为45%。

The addition ofIn significantly increases the overpotential of hydrogen evolution, decreases the corrosion currentdensity, increases Tafel slope 〓 and polarization, decreases Tafel slope 〓 and anode polarization,improves the reversibility of oxidation and reduction reaction, increases 〓 diffusion coefficientand avoids the oversaturation of zincate in electrolyte.

Zn-In合金电极主要是改善了锌电极的抗腐蚀能力和氧化还原反应的可逆性，其在放电容量和循环寿命方面的改善效果并不明显。

A method for direct determination of Cu, Pb, Zn, S, Mg and As in copper sulphide concentrates by Axios PW4400 wavelength dispersive X-ray fluorescence spectrometer using lithium metaborate-lithium tetraborate fusion sample preparation method has been developed.

采用偏硼酸锂和四硼酸锂混合熔剂熔融法制样，波长色散X射线荧光光谱法测定铜精矿中铜、铅、锌、硫、镁、砷，考察了熔剂、玻璃化试剂和预氧化条件对制样的影响。

The existence of titanium dioxide and titanyl sulfate reduces the corrosion of zinc deposits.

结果发现：钛的加入能明显提高钝化膜的耐蚀性，这是由于钝化膜中形成二氧化钛和硫酸氧钛，它们掺杂在钝化膜及其腐蚀产物中，有效抑制了锌镀层的腐蚀。

Results: In HPC and Z n2+ induced groups, all the contents of MT and the activities of antioxida ses were obviously higher than those in H/R (P.05,P.01 respectively ). While using MT, the activities of SOD were progressively increased than contr ol(P.05), CAT and GSHpx activities were lower than control(P.01), bu t were significantly higher than those in I/R group(P.01). In MT antibody g roups, the activities of antioxidase were decreased extremely.

结果：HPC和锌诱导组MT含量及抗氧化酶的活力均显著高于H／R组P.05、P.01：外源MT处理后 SOD活力显著高于对照组（ P＜0.01，CAT和GSHpx活力虽然显著低于对照组但显著高于H／R组(P＜0.01)；使用M T抗体后，酶活力最低。

Instead of using acetylene black graphite powder, the capacity increased by 40%-50%, in 1945 in the electrolytic manganese dioxide battery of the zinc-manganese batteries discharge performance has greatly improved further.

1923年采用乙炔黑代替石墨粉，使容量提高40%-50%，1945年电解二氧化锰在电池中的应用使锌锰电池的放电性能进一步有大的提高。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。