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starting temperature
相关语句
  起始温度
    During the experiments a series of interesting phenomena wcre observed such as great differeces in starting temperature of reduction(here in after abbreviated as STR) resulting from different methods and conditions used by manufacturers during preparation of the catalyst.
    在实验过程中,观察到了一系列有趣的现象。 如:在催化剂制备过程中,采用不同的方法和条件,还原起始温度(简写为STR,下同)就会有很大差别。
短句来源
    Quantum mechanical calculations were performed and the predicted starting temperature of sintering of Raney-Cu conforms well to the experimental result.
    应用量子力学方法计算的烧结起始温度与实验结果吻合较好。
短句来源
    The starting temperature of valence tautomerism is about 300 K.
    自旋交叉和价态互变的相变起始温度约 3 0 0 K.
短句来源
  “starting temperature”译为未确定词的双语例句
    It is found that the starting temperature of slow cooling is increased after addition of the layers and the main nucleation window of Y123 ranges from 970 to 955℃.
    对施加隔离层后大块单畴YBCO/Ag样品生长窗口的研究发现 ,加入隔离层后使慢降温上限温度升高 ,970℃到 955℃是Y1 2 3/Ag系单畴生长的主要窗口 .
短句来源
    It was found the radialized temperature programming groupat the same starting temperature is the ideal group for obtaining A, B parameters;
    研究认为等起点的辐射状程升模式是获取A, B 参数的理想预实验模式;
短句来源
    The reduction condition was basically concluded. The results showed that lowering the starting temperature, then gradually upgrading temperature for several steps, FeCU-NiCh-GIC can be partially reduced to Fe-Ni-GICs in flowing Fk. The Cl/(Fe+Ni) molar ratio of the reduction product became smaller with reduction temperature increase and reduction time prolong.
    研究结果表明,采取降低初始还原温度、梯度升温、分步还原的工艺措施,控制适宜的工艺条件可以在流动性的H_2气氛中使FeCl_3-NiCl_2-GICs部分还原成三元Fe-Ni-GICs,还原产物的Cl/(Fe+Ni)摩尔比随还原温度的提高和还原时间的延长而减小。
短句来源
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  starting temperature
The transformation starting temperature of the high carbon austenite was found to be strongly dependent on the austempering temperature, the heating rate, and the chemical composition of the iron.
      
Results show that there is an optimum starting temperature to pressurize, at which the maximum room temperature shear strength of the joint is obtained.
      
The starting temperature for the reaction of ZnO with chlorine is determined at about 498 K.
      
The heat transfer was also found to increase with increasing sample starting temperature, resulting in a series of boiling curves dependent on initial sample temperature.
      
The Curie temperature, Tc, equilibrium temperature, To 5 (Ms + Af)/2, martensitic transition starting temperature, Ms, and reverse transition finishing temperature, Af , of the β single-phase alloys were sensitive to the Fe and Ga compositions.
      
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When ceric iodate is precipitated from acid solution by the addition of asoluble iodate,a gelatinous precipitate is obtained,which is difficult to filterand wash.The precipitate must be redissolved and reprecipitated as oxalatefor final ignition to ceric oxide.A method has been deviced to improve the form of the ceric iodateprecipitate by slow precipitation in homogeneous solution.Advantage is takenof the fact that cerium exists in two distinct valence states,the cerous and theceric.Cerous iodate is soluble...

When ceric iodate is precipitated from acid solution by the addition of asoluble iodate,a gelatinous precipitate is obtained,which is difficult to filterand wash.The precipitate must be redissolved and reprecipitated as oxalatefor final ignition to ceric oxide.A method has been deviced to improve the form of the ceric iodateprecipitate by slow precipitation in homogeneous solution.Advantage is takenof the fact that cerium exists in two distinct valence states,the cerous and theceric.Cerous iodate is soluble in dilute acid solution,while ceric iodate isinsoluble.Cerium is first reduced to the cerous state by hydrogen peroxide innitric acid solution.Ammonium iodate is added and no precipitation occurs atthis moment.The precipitation is brought about by the slow formation ofceric ion in the iodate solution by ammonium persulfate.Thus a denseprecipitate is formed slowly.This compact volume of the precipitate facilitatesfiltration and washing.The precipitate is ignited directly to ceric oxide,part of which is always stained with a brown color.This is remedied by evapora-tion of the ignited precipitate to dryness with a few drops of concentratedsulfuric acid and ignition to ceric oxide for final weighing.For samples containing 10-50 mg of ceric oxide,a total volume of 300-400 ml gives best results.The optimum concentration of the nitric acid presentis 0.4-0.5 N.A starting temperature of 40-60℃ favors the denseness of theprecipitate.Precipitation is continued at an elevated temperature(70-80℃ )on a hot plate.Stirring not only improves the crystallinity of the precipitateand may decrease the occlusion of impurities,but also shortens the time forcomplete precipitation.Dilute iodic acid solution(1-2%)is used as washsolution.This method is good for samples containing 2.5-250 mg of cericoxide.The composition of the precipitate is not reproducible.The precipitate is abasic iodate and the ratio of IO_3~-found/IO_3~- theoretical for Ce(IO_3)_4 increaseswith the concentration of the nitric acid present(up to 0.5 N)to a maximumvalue of about 0.92.The ratio never reaches unity.An analysis of the pre-cipitate dried at 40-45℃ for 2-3 days shows a fairly constant ratio of IO_3~- found/IO_3 theoretical for Ce(IO_3)_4 From the ratio of Ce:IO_3,an approximate formulaCe_2(IO_3)_7(OH)·XH_2O has been proposed for the precipitate obtained under theconditions described.The number of water molecules in the formula is in-definite,varying from 3 to 5.

1.在均匀溶液中沉淀的碘酸铈,性质紧密,便利于过滤和洗涤。烧灼成为氧化铈后,适合于作为铈的定量分析。2.利用碘酸亚铈能溶解于稀酸溶液而碘酸铈则不溶的区别,先用过氧化氢把全部铈离子还原,再加入碘酸铵,然后进行氧化,使碘酸铈在均匀溶液中沉淀出来。3.本方法适用于含氧化铈2.5—250毫克的样品。4.所得沉淀的分子式经初步测定为 C_(e2)(IO_3)_7(OH)·x H_2O,其中 x 的数值不定,涨落在3与5之间。

Under the laboratory conditions, the reductions of three primary reforming catalysts for large scale ammonia plants were investigated with gaseous hydrocarbons and steam as reducing media. During the experiments a series of interesting phenomena wcre observed such as great differeces in starting temperature of reduction(here in after abbreviated as STR) resulting from different methods and conditions used by manufacturers during preparation of the catalyst. It was also observed in many cases that the steam...

Under the laboratory conditions, the reductions of three primary reforming catalysts for large scale ammonia plants were investigated with gaseous hydrocarbons and steam as reducing media. During the experiments a series of interesting phenomena wcre observed such as great differeces in starting temperature of reduction(here in after abbreviated as STR) resulting from different methods and conditions used by manufacturers during preparation of the catalyst. It was also observed in many cases that the steam to carbon ratio affected significantly the STR oi the catalyst. The Z107 catalyst exhibited higher STR and partially formed NiAl_2O_4 at 800℃ or more. During re-reduction of the reduced and then oxidized catalyst, it was also observed that the STR fell greatly(450℃) compared to the orignal valus. Based on the serial experimental results and thermodynamic analysis, a mechanism for the initial and local formation of weak activityand mechanism for the reaction is proprosed.

本文以气体烃和水蒸汽为还原介质,在实验室条件下,研究了三种大型氨厂应用的一次烃水蒸汽转化催化剂。在实验过程中,观察到了一系列有趣的现象。如:在催化剂制备过程中,采用不同的方法和条件,还原起始温度(简写为STR,下同)就会有很大差别。在许多情况下,也观察到水蒸汽与碳之比对催化剂的STR有显著影响。催化剂Z107显示出较高的STR,并且当温度在800℃或更高时,部分生成NiAl_2O_4,经还原氧化后的催化剂在再还原过程中,也可以观察到其STR与原始值相比大大下降,仅为450℃。本文以此实验结果和热力学分析为基础提出了薄活性的出现和局部形成机理以及还原反应机理。

The effect of copolymeric unit butyl acrylate(BA) upon the thermal degradation process of vinyl chloride(vc) polymer was studied by TG and DSC. We found that the starting temperature of elemination reaction of the side-base of VC-BA copolymer was lower than PVC, but the peak temperature and the temperature of the random scission of the main-chain was higher than FVC. After the elemination reaction some carbonyl groups at the side-base of VC-BA were remained. PVC accompanyed the escaping of...

The effect of copolymeric unit butyl acrylate(BA) upon the thermal degradation process of vinyl chloride(vc) polymer was studied by TG and DSC. We found that the starting temperature of elemination reaction of the side-base of VC-BA copolymer was lower than PVC, but the peak temperature and the temperature of the random scission of the main-chain was higher than FVC. After the elemination reaction some carbonyl groups at the side-base of VC-BA were remained. PVC accompanyed the escaping of the small molecular products of the main-chain degradation when the elemination reaction, but VC-BA doesnt. The introduction of BA to the polymer lowered the thermal stability of the side-base, but rised the stability of the elemination of HCl and the produced conjugated double bouds main-chain.

本文利用热重和DSC法研究了丙烯酸丁酯(BA)共聚单元对氯乙烯(VC)聚合物热降解过程的影响,发现VC-BA共聚物的侧基消除起始温度比PVC降低,而峰值温度和主链裂解温度却提高,侧基上有残存的C=O基存在,不象PVC侧基消除时伴有主链裂解产物选出。BA单元的引入,虽降低了侧基的热稳定性,却提高了消除反应及其产物共轭多烯的稳定性。B A对热降解的反应热效应影响不大。

 
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