查询词典 gas carbon

A self- designed direct current Plasma ionization detectorwas used to determine the carbon dioxide in air with he lium being used as carrier and support gas,the experimental parame-ters of HeDCPID affecting the determination of carbon dioxide were examined.

用改进的直流等离子体离子化检测器对空气中的二氧化碳进行测定。

Major gas carburizing for steel parts used,the use ultra-l-ining and the international advanced energy-saving vacuum sealed fan,the furnace pressure to increase without any le-akage,temperature uniformity,warming fast,insulation good,and an atmosphere of carbon potential uniform seepage work-piece carbon

主要供钢制零件气体渗碳用，由于采用超节能炉衬和国际先进的真空密封风机，使炉压提高，无任何漏气，炉温均匀、升温快、保温好，碳势气氛均匀，工件渗碳速度加快，渗层均匀，本系列井式气体渗碳电炉大大提高了生产效率和渗碳质量。

Such a viewpoint of the effects of a little water addition has never been reported, it opened a new way to product SWCNTs with high purity and low cost. On the ground of the experimental results and mechanism studies, a little water addition may open a way for using the natural gas as carbon source to manufacture SWCNTs. By analyzing XRD, XPS results and with comparative experiments, we concluded that the active phases of SWCNTs growth in Ar were small Fe particles. A little W species can improve the surface characters of support and increase the dispersion of Fe particles, but higher W loading will cause large quantity of WC, which decompose CH〓 to amorphous carbon.

本文根据W-Fe-MgO催化剂中间产物和粗产物的XRD、XPS测量结果，结合制备实验和对比实验指出：在Ar中1073K下，生长SWCNTs的活性相是Fe的小颗粒，少量W在催化剂中以氧化物形式对载体表面改性，起提高Fe分散度的作用，但W浓度过高时在反应过程中会生成大量WC，又会催化CH〓分解为无定形碳，造成产物中SWCNTs含量下降。

The use of carbon monoxide from coal or natural gas to produce dialkyl oxalate is an important research area in C1 chemical technology. The chemical reactions and performance in the coupling reaction system for synthesis of diethyl oxalate from carbon monoxide and ethyl nitrite were tested in the presence of hydrogen under the typical coupling reaction conditions.

摘 要：实验研究了在氢气存在下，一氧化碳与亚硝酸乙酯偶联合成草酸二乙酯反应体系在典型操作条件下的化学反应和反应性能，结果表明氢气只与反应体系中的亚硝酸乙酯反应生成乙醇。

The results showed that (1) The grain size of nanometer YiO_2 was40～80nm.The wavelength corresponding to the maximum absorbency values were observedin the 200～320nm range.The crystal structure of carbon doped TiO_2 photocatalyst is primarilyanatase(22.43% rutile), and the content of carbon is about 4.6%.(2) The relative humidityvaring from 8% to 80%, the photocatalytic degradation degree of benzene increased withincreasing relative humidity; and to toluene, degradation rate was hanced by relative humidityup to 60%, and more or less inhibited above 60%.(3) Scheme and results of orthogonal testswere used by evaluating the photocatalytic performance of the gas phase methanol, acetoneand 1-heptane.The results revealed that their degradation degree reached 84.5%, 93.39% and93.45%, respectively.(4) The 254nm UV lamp showed higher photocatalytic degradation rate.For methanol, acetone and 1-heptane, it was found that photocatalytic degradation reactionoccurs with the light strength of daylight lamp.(5) Under the the same conditions, 15%degradation degree has been obtained for benzene, whilst about 10% degradation degree wasattained by Degussa P25; During the initial phases, the toluene revealed higher photocatalyticactivity, comparing with Degussa P25, the degradation degree of methanol, acetone and1-heptane were slightly lower.

结果表明：(1)CVD法制备的纳米TiO_2光催化剂，颗粒球形度好、粒径在40～80nm之间；最大吸光度值所对应的波长为200～320nm；含碳量约为4.6％；晶型组成主要为锐钛矿型，金红石的含量约为22.43％；(2)在相对湿度为8％～80％范围内，苯的光催化降解率随着相对湿度的增大而增大；甲苯在相对湿度为60％时达到最好降解效果，当相对湿度增大到80％时光催化效果降低；(3)将正交实验设计及实验方案应用于气相甲醇、丙酮和正庚烷光催化降解研究，实验结果表明：三者最高降解率分别为84.5％、93.39％和93.45％；(4)有254nm紫外灯参与的光催化实验可以大大提高有机气体的光催化降解率；在日光灯的照射下，掺碳纳米TiO_2对气相甲醇、丙酮和正庚烷具有一定的光催化氧化能力；(5)较P25粉，在相同的光催化操作条件下：气相苯的平均降解率达15％，高于P25粉10％的降解率；气相甲苯在初始阶段具有较高的反应速率；气相甲醇、丙酮和正庚烷的降解率略低于P25粉。

Considering a spherical porous carbon particle immersed in a static ambient atmosphere, the combustion characteristics under three basic conditions: frozen flow, equilibrium flow, partial flow are solved in a half-analytical and half-numerical way. By using the LAEA (Large Activation Energy Asymptotic Method), the departure value of some parameters such as combustion rate, temperature, and concentration are obtained. On this basis, the rules of a carbon particle combustion under various conditions when the gas phase Damk〓hler number is in the range of 0,+∞ are summarized.

建立氧化性环境中相对静止的多孔炭粒燃烧的控制方程，采用半解析、半数值方法求解出炭粒在冻结流、部分流、平衡流三种基本情况下的燃烧规律，并采用大活化能渐近匹配方法，计算出偏离冻结流、偏离平衡流情况下燃烧速率、温度及组分浓度等参数的偏离解，进而总结出炭粒在气相Damk〓hler数为0，∞整个范围内燃烧特性变化规律。

This paper also introduces properties of rayon carbon fabric /phenolic anti-ablation, and the test results of thermal-resistant articles used on three kind of solid motors ,demostrating that rayon carbon fabric /phenolic articles can resist imping ment by combustion gas flow,wit.

介绍粘胶碳布/酚醛耐烧蚀材料预浸料的组成、性能，及其制成的防热零件在固体火箭发动机上的应用试验。

This paper also introduces properties of rayon carbon fabric/phenolic anti-ablation, and the test results of thermal-resistant articles used on three kind of solid motors ,demostrating that rayon carbon fabric/phenolic articles can resist imping ment by combustion gas flow,wit...

因此，对这些部位要求材料具有优异的耐燃气流冲刷性能。常用的耐烧蚀涂料、耐烧蚀弹性体以及高硅氧/酚醛耐烧蚀材料等虽在

The Rectisol process is a physical absorption method of using the excellent character of low temperature methanol to remove the light hydrocarbon, carbon dioxide, sulfureted hydrogen, carbon oxysulfide, cyanide and so on, and it can remove the sulfides from the synthesis gas by 0.1ppm.

低温甲醇洗法是利用低温下(-50℃～-70℃)甲醇的优良特性脱除原料气中的轻质油、二氧化碳、硫化氢、硫氧化碳和氰化物等的物理吸收法，能将合成气中的硫化物脱至0.1ppm。

At the same time, import agent titanium dioxide, ultra-white ultra-fine calcined kaolin, Brightener, magnesium hydroxide, carbon black, white carbon black gas, and has made three zinc Hunan Antimony Trioxide Antimony Industry Co., Ltd. in east China general agent, the company has a independent right to import and export products are exported to India, Korea, Singapore and other countries.

同时代理进口钛白粉，超白超细煅烧高岭土，增白剂，氢氧化镁，碳黑，气相白碳黑，并取得了湖南三锌锑业有限公司三氧化二锑华东地区总代理，公司拥有独立的进出口权，产品远销印度、韩国、新加坡等国家。

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。