碳化

THE FIRST TOTAL SYNTHESIS OF TAXAMAIRIN B Taxamairin B, representive of rare naturally-occuring rearrang-ed 9(10→20)-abeo-8, 11, 13-triene diterpenoids, has been firstsynthesized by a eleven-step route in an overall yield of 8.19%,starting from commercially available catechol and 1,3-cyclohexan-dione. The improved Friedel-Crafts annulation, thermodynamicallycontrolled-geminal pairing methylation, the selective oxidation ofallyl group and the selective reduction of the less-hindrancecarbon-carbon double bond are the key steps.

二。美丽红豆杉素B的全合成研究 1，美丽红豆杉素B的首次全合成以价廉，易得的邻苯二酚和1，3-环己二酮为原料，经过改良的Friedel-Crafts烷基化反应，热力学控制的α，β-不饱和酮结构的α一位双烷基化，烯丙位的选择性氧化，以及选择性还原位阻较小的碳碳双键等十一步反应，以8.19％的总收率首次完成了美丽红豆杉素B的全合成。

Retention of cations such as quats on Hypercarb is dueto the interaction with the electron cloud on the graphite; also,these are flat molecules which can align themselves closely to thesurface

而百草枯和敌草快在 Hypercarb 上保留依赖的是电子云和石墨化碳的作用，同时，这个平面分子和以很近的吸附在石墨化碳的表面

Specimens of the SBCB with different graphitizing degree were obtained in laboratory. Effects of graphitizing degree on the properties of the SBCB, including structure, thermal conductivity, thermal expansivity, resistance to thermal shock, resistance to erosion of molten iron and slag, were studied respectively.

在实验室制备了不同石墨化度的自焙碳块，并研究了石墨化度对自焙碳块的结构性质、高温冶金性能(包括恒压比热容、热扩散率、导热性、热膨胀性、抗热震性)、抗铁水和熔渣侵蚀性能及铁水渗透的影响。

The main purposes: high-temperature vacuum graphite induction furnace is mainly used for a carbon-carbon-graphite composite materials processing.

一、主要用途：真空高温感应石墨化炉主要用于碳一碳复合材料的石墨化处理。

Progress and key difficulties in the synthesis and characterization of carbon nitride crystals are summarized.

介绍了氮化碳晶体的合成与表征研究进展，分析了氮化碳晶体合成中存在的主要困难。

The structures of 6 main products of ozonization of nopol were identified by GC-MS, and they are all four-ring compounds , the result suggests that the double bond, tertiary hydrogen can be oxidized, and there was other further oxidation.

通过GC-MS分析确定了6个诺卜醇臭氧化主要产物的结构，它们均为四元环类化合物，这表明诺卜醇臭氧化时碳碳双键、叔氢都会被氧化，还伴有其它更深层次的反应。

Earbonitriding Earbonitriding, sometimes known as dry cyaniding or nicarbing, is a case-hardening process in which the steel is held at a temperature above the critical range in a gaseous atmosphere from which it absorbs carbon and nitrogen.

碳氮共渗碳氮共渗，有时也称为干法氰化或渗碳氮化，是一种表面硬化工艺。通过把钢放在高于临界温度的气体中，让它吸收碳和氮。

The enhance nient of the corrosion resistance laser dadoling of the CNTs/Ni60 coatings is due to that the reserved carbon nanotubes in the coatings segregate the corrosive medium and promote N-based alloy passivation, the formed phases of the carbide and the reserved carbon nanotubes homogenous distribution in the claddings resist die corrosion.

碳纳米管／镍基激光熔覆层耐腐蚀的原因在于熔覆层保留的碳纳米管使熔覆层更加致密，隔离了腐蚀介质，促进了镍基合金的钝化，从而提高了熔覆层的耐蚀性；同时，熔覆层中保留下来的碳纳米管和被分解的碳纳米管与金属基体形成碳化物，作为增强相均匀弥散在熔覆层中，它们的存在阻止了腐蚀坑的长大，因而蚀坑较小，耐腐蚀性得到提高。

The one carbon unit transfer reaction involving in the tetrahydrofolate coenzymes has caused great interest which is very important in the living system and has played an important role in the designing and syntheses compounds (especially the anti-cancer and LCD materials). In our study it was found that benzimidazolium salt has the ability to transfer one or two one-carbon unit and is a kind of new tetrahydrofolate coenzymes model. This research provides new method for biomimetic synthesis.

在非酶催化条件下，不仅实现了与生物体内相类似的一碳单元转移反应，而且可以转移具有不同官能团的取代&一碳单元&，使这种一碳单元转移反应传递的功能化一碳单元更加多样化，这方面强劲的研究工作进展，将为异常活跃的合成化学提供更多常规合成方法难以实现或实现不理想的仿生合成新方法。

Due to the suppression of reverse water gas shift reaction by adding steam in feed gas, more CO〓 participated in and promoted CO〓 reforming of CH〓 reaction, higher catalytic activity and less carbon deposition were obtained. On the surface of used catalyst there were two kinds of carbon species deposited on catalyst, one was decomposed CH〓 fragment, and the another was graphiticlike carbon.

在反应后催化剂表面有两类碳物种，一类在250～350℃出现的少量α-碳，应主要是活性高的CH〓解离碎片，一类是在700℃附近出现的β-碳，应是导致催化剂失活的类石墨化碳。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。