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kinetics of hydrogen     
相关语句
  氢动力学
     KINETICS OF HYDROGEN ABSORPTION IN ML-Ni-Co-Mn-Al ALLOYS
     ML-Ni-Co-Mn一Al合金吸氢动力学
短句来源
     KINETICS OF HYDROGEN ABSORPTION IN THE α PHASE OF ACTIVATED MMNi_5 PREPARED BY CHEMICAL METHOD
     化学法合成的MMNi_5在α相区吸氢动力学研究
短句来源
     Kinetics of Hydrogen Absorption by Ti-V Alloy
     钛—钒合金的吸氢动力学
     The influences of thirteen working and heat treatment condition on hydrogen absorptive properties of Zr-1Nb alloyin the water of 360℃and 19MPa have been investigated. Some influencing factors and the absorption mechanism of hydrogenare analyzed. The absorption kinetics of hydrogen is discussed.
     研究了13种不同加工热处理制度的Zr-1Nb合金在堆外高压釜内360℃、19MPa水中的吸氢性能,对其影响因素和吸氢机理进行了分析,并讨论了吸氢动力学,建立了吸氢动力学方程,计算了吸氢动力学参数。
短句来源
     Kinetics of Hydrogen Absorption andDesorption by Titanium
     钛吸氢和放氢动力学
短句来源
更多       
  吸氢动力学研究
     KINETICS OF HYDROGEN ABSORPTION IN THE α PHASE OF ACTIVATED MMNi_5 PREPARED BY CHEMICAL METHOD
     化学法合成的MMNi_5在α相区吸氢动力学研究
短句来源
     The Kinetics of Hydrogen Interaction With Thin Films
     储氢薄膜的吸氢动力学研究
短句来源
  氢动力学的
     In the paper the kinetics of hydrogen absorption was studied, and a basic model was presented for the non-evaporable getter material.
     以非蒸散型吸气剂材料为研究对象,提出了一种吸氢动力学的基本模型。
短句来源
  氢的动力学过程
     The kinetics of hydrogen absorption in LaNi_5 has been investigated at initialpressures of 15--30 atm and temperatures in the range of 20--85℃. LaNi_5 was pre-pared in a ZrO_2 crucible in a graphite-tube furnace under vacuum.
     在初始压力15—30atm、温度20—85℃的范围内研究了储氢材料LaNi_5在恒温时吸氢的动力学过程.
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  kinetics of hydrogen
Thermodynamics and kinetics of hydrogen evolution in hydrogenated amorphous silicon films
      
Then a mathematical analysis of the kinetics of hydrogen removal is presented.
      
Interfacial kinetics of hydrogen with liquid slag containing iron oxide
      
The kinetics of hydrogen reduction of thin, dense strips of hematite were investigated in the range 245 °C to 482 °C.
      
Then a mathematical analysis of the kinetics of hydrogen removal is presented.
      
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The kinetics of hydrogen absorption in LaNi_5 has been investigated at initialpressures of 15--30 atm and temperatures in the range of 20--85℃. LaNi_5 was pre-pared in a ZrO_2 crucible in a graphite-tube furnace under vacuum. It is shownthat a linear relationship exists between the amount of hydrogen absorbed, W,and the time of reaction on a logarithmic scale and the rate of hydrogen absorp-tion depends on the initial pressure and the test temperature. The P-X-T curves of the LaNi_5 system...

The kinetics of hydrogen absorption in LaNi_5 has been investigated at initialpressures of 15--30 atm and temperatures in the range of 20--85℃. LaNi_5 was pre-pared in a ZrO_2 crucible in a graphite-tube furnace under vacuum. It is shownthat a linear relationship exists between the amount of hydrogen absorbed, W,and the time of reaction on a logarithmic scale and the rate of hydrogen absorp-tion depends on the initial pressure and the test temperature. The P-X-T curves of the LaNi_5 system have been determined. For each testtemperature there is a corresponding pressure plateau P_0 and it is therefore as-sumed that for every initial pressure P_0 there is a corresponding balance temperatureT_0, and T_0-T may be taken as the driving force of hydrogen absorption processin LaNi_5 at initial pressure P_0 and test temperature T. The absorption of hydro-gen takes place in three steps: (1) surface reaction, which seems to be rather com-plicated; (2) diffusion of hydrogen atoms and (3) phase transformation f LaNi_5 toa hydride phase. All these steps are thermal activation processes, and thereforethe e~(-U/RT) can be introduce in the hydrogen absorption process. The relatioshipbetween the absorption rate, the initial pressure, the test temperature and time isgiven as follow: dW/dt=A_0(T_0-T)e~(-U/RT)·1/tThe activation energy of the rate limiting step U is about 2 or 3.2 kcal/molaccording to whether the amount of hydrogen absorbed is less or more than 70%respectively. The parameter U of the rate-limiting step during hydrogen absorptionin LaNi_5 can be obtained as shown by our experiments.

在初始压力15—30atm、温度20—85℃的范围内研究了储氢材料LaNi_5在恒温时吸氢的动力学过程.实验结果表明:吸氢量与时间的对数呈线性关系;吸氢速率随初始压力的提高或吸氢温度的升高而改变.提出了表示吸氢速率对时间、初始压力、吸氢温度依赖性的关系式,实验结果与之一致.按这一关系式可以得到吸氢速率的限制性环节的激活能U.在吸氢量(以饱和度计)约70%以前,U约为2.0 kcal/mol H_2,吸氢量更高时约3.2 kcal/mol H_2.这些数据为进一步确定吸氢速率的限制性环节提供了重要参数.

This article describes the thermodynamics and kinetics of hydrogen reduction of metal chlorides, and indicater that most chlorides can be reduced by hydrogen. During the reduction process, it is possible to obtain metal with dense layer or ultrafine powder by controlling the reaction temperature and chloride concentration. The effects of reaction temperature and chloride concentration on the deposition rate of metal are also discussed. The investigation and application of this process are presented....

This article describes the thermodynamics and kinetics of hydrogen reduction of metal chlorides, and indicater that most chlorides can be reduced by hydrogen. During the reduction process, it is possible to obtain metal with dense layer or ultrafine powder by controlling the reaction temperature and chloride concentration. The effects of reaction temperature and chloride concentration on the deposition rate of metal are also discussed. The investigation and application of this process are presented.

本文对金属氯化物氢还原过程的热力学及动力学进行了分析讨论,指出大多数金属氯化物可被氢气还原。在还原过程中,控制反应温度及氯化物浓度可以获得金属致密镀层或超微粉末。同时还讨论了反应温度和氯化物浓度对金属沉积速度的影响。并略举了这方面的研究和应用。

The combustion kinetics of hydrogen associated in the coke deposited on CRC-1 catalyst has been investigated at high temperatures up to 750℃ and under oxygen partial pressures from 11.5 to 23.0 kPa. A highly sensitive ther- moconductivity detector was used to trace the transient reaction rate from the water vapor concentration in the reactor effluent gases. The problem evolved from the tendency of water vapor absorption on the catalyst and any other exposed surfaces was solved by means of pulse reaction...

The combustion kinetics of hydrogen associated in the coke deposited on CRC-1 catalyst has been investigated at high temperatures up to 750℃ and under oxygen partial pressures from 11.5 to 23.0 kPa. A highly sensitive ther- moconductivity detector was used to trace the transient reaction rate from the water vapor concentration in the reactor effluent gases. The problem evolved from the tendency of water vapor absorption on the catalyst and any other exposed surfaces was solved by means of pulse reaction technique and a model reactor, simulating the hydrogen burning process in the continuous mode of regeneration. The following rate equation was established -dH/dt=k_H P_O2 H k_H=2.47×10~(10)exp( -37.66×10~3/RT) The influence of pore diffusion of oxygen in the catalyst pores become signifi- cant when the temperature is higher than 700℃. It has also been observed that the rate coefficient of hydrogen burning is nearly 2.3 times as great as that of carbon under the same condition. During regeneration, the C/H ratios change as the hydrogen depletes more quickly than carbon and can be expre- ssed as C/H=(C/H)_0 exp(kH-k_c)P_(O_2) t A comparison between the experimental results of continuous mode and those obtained from the model reactor has shown that the validity of acquiring kinetic data through the pulse mode technique is equivalent to that of the conventional method-the continuous flow mode.

作者利用脉冲实验技术,在等温固定床反应器中,以工业CRC-1分子筛裂化催化剂为对象,研究了焦炭中氢的燃烧速率与催化剂上氢含量、再生气氧分压和温度的关系。在温度600~750℃,再生气氧分压11.5~23.0kPa,催化剂初始含氢量0.04%(重)的实验范围内,建立了氢燃烧速率方程:-dH/dt=k_H P_O2 H(mg/s)当温度小于700℃时,ka=4.06×10~3exp[-37660/RT](Pa·s)~(-1)当温度大于700℃时,反应开始进入反应-扩散控制的过渡区域。再生时,焦炭中氢的燃烧速率常数约为碳的2.3倍.再生过程中碳氢比变化规律可用下式表示:C/H=(C/H_0)exp[(k_H-k_c)P_(O2) ·t]当碳烧掉80%时,氢基本烧完.同时,还设计了模拟实验.模拟连续再生时氢的燃烧过程。通过脉冲法实验,连续法实验和模拟实验的相互对比,证实了脉冲法与连续法两种方法的实验结果在动力学上是等同的。

 
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