碳

SiC powders are synthesized by reducing silica with amylum in a flow argon atmosphere at 1500℃, 1600℃ and 1700℃, respectively.

以硅溶胶为硅源，淀粉为碳源，采用低温碳热还原法合成了SiC微粉。

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。

Generally speaking, the reaction types involvingα-oxoketene--acetals mainly include the regioselective addition-aromatization with organometallic reagents, conjugate addition-cyclization with nitrogen nucleophilicspecies, nucleophilic reactions ofα-carbon, acting as odorless dithiol equivalentsin thioacetalization, Michael additions and [5+1] annulation, as well as the synthetic applications based on the above reactions.

一般来说，基于α-羰基二硫缩烯酮化学的反应主要为：与金属有机试剂的选择性加成反应，与氮亲核体的共轭加成反应，α-碳原子的亲核性及相关反应，烷硫基作为硫醇的替代试剂的应用，α-羰基二硫缩烯酮在碳环、杂环化合物合成中的应用等。

Chemical research indicated that the main chemical constituents of Aquilegia is C- glycosylflavones and oxoaporphine alkaloids, which are the characteristic chemical constituents, especially, the content of C-glycosylflavones is very high in this genus.

通过对耧斗菜属植物的化学研究表明，黄酮碳甙和氧化阿朴菲类生物碱是该属的特征性成分；其中尤以黄酮碳甙含量较高，为主要成分。

In order to find the difference of the isotopic composition of different organic compounds before and after complexation, the autogamy standard sample is performed by molecular sieve adsorption to study the variation of the isotope compositions of n-alkanes, isoalkanes and cyclanes.

通过对自配标准样品进行S分子筛吸附试验，测定了用5分子筛吸附法分离前后正构烷烃、异构烷烃和环烷烃碳同位素值，探讨试验前后碳同位素值的变化。

Enterprises to adopt advanced production equipment and testing equipment, has automatic variable cross-section mill CNC, automatic volume headphones, automatic CNC Control Step-by-step heat treatment furnace, hardening machine, stress shot peening machines, automatic assembly line, electrostatic spray lines, etc.; with professional Physicochemical room and laboratory, equipped with polishing machine, vertical metallographic microscope, spectrophotometer,¨furnace, carbon and sulfur analyzer United, fatigue tester, stiffness tester, high-arc machine Rockwell Hardness Tester and a full range of advanced testing equipment.

企业采用先进的生产设备和检测设备，有全自动数控变截面轧机、全自动卷耳机、全自动数控步进式热处理控制炉、淬火机、应力喷丸机、全自动组装线、静电喷漆线等；设有专业的理化室和试验室，配备抛光机、立式金相显微镜、分光光度计、定碳炉、碳硫联合分析仪、疲劳试验机、刚度试验机、弧高分选机和洛氏硬度计等先进齐全的检测设备。

The result showed that every azeotrope was homogeneous and sensitive to pressure, which means a significant change in the azeotropic composition and allows the recovery of feed components without adding a separating agent.

结果显示：常压下，5个碳以下的某一腈类物质1与沸点在±1 t 20℃范围内的羟基在1号碳位上的直链醇类会形成均相共沸物，且其共沸组成随压力变化敏感，理论上可用变压精馏进行分离。

PWR is working with the University of Bayreuth on a system that can sequestrate carbon quite easily.

PWR正与德国贝鲁伊特大学合作开发一个固碳系统，固碳方便且效果持久。

Suitable water-immiscible organic solvents include aromatic hydrocarbons, eg toluene, xylene, naphthalene, tetrahydronaphthalene and methyl naphthalene; chlorinated aromatic hydrocarbons, eg chlorobenzene, fluorobenzene, chloronaphthalene and bromonaphthalene; esters, eg butyl acetate, ethyl acetate, methyl benzoate, ethyl benzoate, benzyl benzoate, butyl benzoate, phenylethyl acetate, butyl lactate, benzyl lactate, diethyleneglycol dipropionate, dimethyl phthalate, diethyl phthalate, dibutyl phthalate, di(2-ethylhexyl) phthalate; alcohols having six or more carbon atoms, eg hexanol, octanol, benzyl alcohol, phenyl ethanol, phenoxy ethanol, phenoxy propanol and phenoxy butanol; ethers having at least 5 carbon atoms, preferably C 5-14 ethers, eg anisole and phenetol; nitrocellulose, cellulose ether, cellulose acetate; low odour petroleum distillates; turpentine; white spirits; naphtha; isopropylbiphenyl; terpene; vegetable oil; mineral oil; essential oil; and natural oil; and mixtures of any two or more thereof.

适用于水互溶的有机溶剂包括芳香族碳氢化合物，如甲苯，二甲苯，萘，四氢萘和甲基萘；氯代芳香族碳氢化合物，如氯苯，氟，氯萘和萘；酯类，如醋酸丁酯，醋酸乙酯，苯甲酸甲酯，苯甲酸乙酯，苄酯，苯甲酸正丁酯，苯，醋酸丁酯乳酸，乳酸苄，二甘醇二丙酸酯，邻苯二甲酸二甲酯，邻苯二甲酸二乙酯，邻苯二甲酸二丁酯，二（2乙基己基）酯；醇有6个或更多碳原子，如己醇，辛醇，苯甲醇，苯乙醇，苯氧基乙醇，丙醇和苯氧基苯氧丁醇；醚至少有5个碳原子，最好荤5-14醚，如苯甲醚和phenetol；硝化棉，纤维素醚，醋酸纤维素，低气味石油蒸馏；松节油；白酒，石脑油isopropylbiphenyl；萜类，植物油，矿物油，挥发油；和天然油，以及任何两个或两个以上其混合物。

The global carbon cycling is one of the core projects of global biogeochemistry. It is concentrated on the missing sink.

全球碳循环是全球生物地球化学的主要研究方向之一，目前其重点集中在"碳失汇"问题的研究上。

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。