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hydrogen
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    Effect of Alloying, Heat Treatment and Magnetization Treatment on Microstructure and Electrochemical Properties of AB_5 Type Hydrogen Storage Electrode Alloy
    合金化、热处理及磁化处理对AB_5型贮电极合金微结构与电化学性能的影响
短句来源
    A Study on the Improvement of Cycling Stability of Ball-milled Mg-based Hydrogen Storage Electrode Alloys by Means of Multi-component Alloying
    以多元合金化改进球磨Mg基贮电极合金循环稳定性的研究
短句来源
    Study on Electrochemical Behavior of AB_5-type Hydrogen Storage Alloys for Ni-MH Battery
    MH-Ni电池用AB_5型贮合金电化学行为的研究
短句来源
    Study of Hydrogen Storage Alloys for High-power MH/Ni Battery
    高功率MH/Ni电池用负极贮合金的研究
短句来源
    Research on Nd-Free LPC-Type Hydrogen Storage Alloys for Hydride Electrodes
    无钕稀土LPC系贮合金电极材料的开发研究
短句来源
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  氢的
    INTERACTION BETWEEN HYDROGEN AND A TYPE Ⅲ CRACK
    Ⅲ型裂纹剪应力场和氢的互作用
短句来源
    RELATIONSHIP BETWEEN HYDROGEN SOFTEN—ING OR HYDROGEN HARDENING AND THE STATE OF HYDROGEN IN α-Fe
    α—Fe 中氢致软化同氢致硬化与氢的状态间的关系
短句来源
    The Effect of Interactioon of Rare Earth Elements and Hydrogen on the Mechanical Properties of Cast Steel
    铸钢件中稀土元素与氢的相互作用对机械性能的影响
短句来源
    The kinetics of hydrogen absorption by Ti-10V α+β dual phase alloy and Ti-30V β single phase alloy
    Ti-10V与Ti-30V合金吸氢反应的激活能分别为57.3和84.4kJ/mol。 Ti-10V合金吸氢由氢在α相中的扩散过程所控制,而氢穿过表面氧化膜则是Ti-30V合金吸氢的速率控制步骤。
    The hydrogen balance pressure of Mg-based composite materials and thermodynamics were studied in this paper, and the effect of surface energy of grain of Mg-based materials on balance pressure has been gained. Thermodynamic equation with surface energy was established, and various balance pressure of Mg-based materials on various temperature were calculated using the equation.
    研究了镁基储氢材料粉末的表面热力学问题,从化学平衡的角度探讨了镁基储氢材料的吸放氢的平衡压问题,及镁基储氢材料颗粒的表面状态对材料吸放氢平衡压的影响,建立了包含镁基储氢材料的表面自由能的热力学方程,并从理论上计算出了不同温度下镁基储氢材料的平衡压力.
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  氢能
    Mg-based alloy has been regarded as the most prospective hydrogen storage alloy because of its high hydrogen storage capacity, light weight, low environmental effect and abundance in the earth's crust.
    镁基合金(Mg_2 NiH_4)作为储氢材料以其优良的特性(如具有重量轻、储氢密度高、镁资源丰富、环境污染小等)被认为是氢能利用和燃料电池最具有开发应用价值的储氢材料。
    Carbon Nanotubes and Hydrogen Energy
    纳米碳管与氢能
短句来源
    Finally, some suggestions are proposed to promote the development and application of hydrogen energy materials.
    提出了加强氢能技术的研究 ,促进贮氢材料在交通运输、尤其是航运与船舶动力装置中应用的一些看法
短句来源
    One dimensional carbon nanomaterials become a candidate with many advantages for hydrogen storage because of their high surface area and other special properties.
    氢能的储存是氢能利用的关键 ,一维碳纳米材料具有非常高的比表面积及一些常规材料所不具备的特异效应和性能 ,因此有望成为颇具优势的储氢材料。
短句来源
    Hydrogen has been regarded a~ one of new energy sources because of its cleanliness and high energy density.
    氢能作为一种高能量密度、清洁的绿色新能源,已日益受到人们的重视。
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  “hydrogen”译为未确定词的双语例句
    THE INFLUENCE OF Si ON PHASE RELATION AND HYDROGEN ABSORPTION PROPERTIES OF LaNi_5
    Si对LaNi_5相关系与贮H_2性能的影响
短句来源
    Kinetics of Hydrogen Absorption in MmNi_(3.55)Co_(0.75)Mn_(0.4)Al_(0.3) Alloy
    Kinetics of Hydrogen Absorption in MmNi_(3.55)Co_(0.75)Mn_(0.4)Al_(0.3) Alloy
短句来源
    Magnetic Properties and Oxygen Content of Nanocrystalline FeCuNbSiB Alloy Annealed in Hydrogen and Air
    Magnetic Properties and Oxygen Content of Nanocrystaline FeCuNbSiB Alloy Annealed in Hydrogen and Air
短句来源
    In the technique copper powder is added into Al(NO3)3 aqueous solutions with concentration of 50 g/L and well mixed. After the mixture being dried at 80 ℃,Al(NO3)3 is decomposed into Al2O3 at 500 ℃ under hydrogen protection atmosphere.
    在浓度为50 g/L的Al(NO3)3溶液中加入Cu粉,搅拌至糊状,在80℃干燥后,于H2保护气氛下加热至500℃使得Al(NO3)3分解成Al2O3,所得粉末在真空烧结机中加热到800℃。
短句来源
    The results indicate that CoSb3 compound powder with about 30nm was obtained through reducation processing under 300 to 600℃ while flowing pure hydrogen and with proper moral ratios of Sb/Co and C6H8O7/Co.
    研究结果表明,当Sb/Co和C6H8O7/Co的摩尔配比适当,且还原气氛为H2,温度为300~600℃,最终可得到平均粒径尺寸在30nm左右的CoSb3纳米粉体。
短句来源
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  hydrogen
In the CoMSIA model, steric, electrostatic, hydrophobic and hydrogen bond donating factors were correlated to the activity and later the favorable and unfavorable regions of interaction were obtained.
      
tripos standard, hydrogen bonding, parabolic indicator in the case of CoMFA and steric, electrostatic, donor, acceptor, hydrophobic, donor and acceptor, steric and electrostatic in the case of CoMSIA.
      
Flavonoid antioxidants act as scavengers of free radicals by rapid donation of a hydrogen atom.
      
In addition, electrostatic, hydrogen-bonding, and dipole-dipole interactions are responsible for the above separations, which improve the selectivity of DNB for solutes.
      
Both metalation reaction with n-butyllithium and hydrochlorination reaction with dry hydrogen chloride selectively and quantitatively occurred at the pendant reactive sites, generating polymeric benzyllithium and 1-chloroethylbenzene species.
      
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The study of the distribution of hydrogen in steel ingots, despite its practical importance, has not received due attention from previous workers. Available experimental results are mainly fragmentary and non-systematic, and therefore many disputable opinions exist. Desirous of investigating this problem in greater details, the authors employed several annealed ingots of high chromium steels which were considered to be particularly suitable because they evolved little gas at room temperature and consequently...

The study of the distribution of hydrogen in steel ingots, despite its practical importance, has not received due attention from previous workers. Available experimental results are mainly fragmentary and non-systematic, and therefore many disputable opinions exist. Desirous of investigating this problem in greater details, the authors employed several annealed ingots of high chromium steels which were considered to be particularly suitable because they evolved little gas at room temperature and consequently the inherent difficulty to avoid the loss of hydrogen during sampling was, to a very large extent, overcome. For this purpose also, suitable apparatus capable of determining relatively small amount of hydrogen was constructed. The results obtained show that the hydrogen distribution in the annealed ingots follows a significant and regular pattern, thus dismissing certain misgiving conclusions based on contradictory results given by previous workers. Although the average hydrogen content of the anealed ingots amounted to not more than half that of the liquid stael, yet in certain parts of their interior the local hydrogen content was found to be higher than that of the liquid steal. This affirms the existence of hydrogen segregation in steel ingots. Moreover, from maps of hydrogen contour lines drawn for the ingots it can be seen that the regions of the highest hydrogen content roughly coincide with the last solification. Indeed, the effect due to certain external irregularities encountered in the course of solification is detectable rather from the hydrogen maps than by the usual method of macro-etching.In the longitudinal or the transverse direction of the annealed ingots, the general trend of hydrogen variation based on average hydrogen content is shown to be governed by the law of hydrogen diffusion. Further examinations reveal that the ingot structure and its internal porosity exert considerable influence upon the distribution. It is likely that hydrogen diffusion may be faster in columnar crystals than in equi-axed crystal regions. The presence of porosities in ingots seems to retard the removal of hydrogen. Such implications have not been sufficiently realized in the past.Based on the discussion of the experimental results, certain immunizing treatment suitable for preventing hairline cracks in certain types of steel is explained.

氢在鋼锭中的分佈是一个具有重要实际意义的问题,但在过去未得到研究工作者足够的重视.本文利用高铬型合金鋼在常温下不损失氢的特点,并建立了適宜的半微量定氢装置,对退火后的鋼锭中各个部位进行了定氢试验。结果证明,氢在鋼锭中的分佈是具有规律性的,指出了前人根据不全面的实验结果所提出的错误结论. 经过退火处理后的鋼锭,其平均含氢量虽然只及原来钢液含氢量的一半,伹在某些局部其含氢量反而高於钢液.这说明钢锭中确有氢的偏析现象存在.根据等氢曲线的分布情况来看,钢锭中氢偏析严重之处大致与最后凝固的部分相符.凝固过程中钢锭一面受到中注管散热的影响,也能从等氢曲线的分佈情况反映出来,而这种影响从低倍检验结果来看是没有能够觉察到的. 从氢含量变化的平均趋势来看,退火钢锭中的氢分佈不管是沿横方向抑是沿縱方向都服从於扩散规律,伹必须考虑到结晶构造和内部缺陷的影响.譬如,沿柱状晶轴方向的氢扩散似乎比等轴晶区域内的氢扩散速度大,而钢锭中心疏松对於去氢则起阻碍作用,过去对於这些方面的了解是不够的. 根据上述结果的分析讨论,本文还为某种防止钢中白点的热处理方法提供了理论上的解释.

The solubility of hydrogen in molten iron, nickel, iron-copper and iron-copper-nickel alloys has been studied. Methods for solubility determination and deoxidizing conditions of specimens have been examined and comparison of experimental results with thermodynamic calculations shows that insufficient deoxidation of melts may lead to inaccurate results.Experimental results obtained with helium argon and molybdum methods are compared, and the helium method appears to be the most reliable. In the present...

The solubility of hydrogen in molten iron, nickel, iron-copper and iron-copper-nickel alloys has been studied. Methods for solubility determination and deoxidizing conditions of specimens have been examined and comparison of experimental results with thermodynamic calculations shows that insufficient deoxidation of melts may lead to inaccurate results.Experimental results obtained with helium argon and molybdum methods are compared, and the helium method appears to be the most reliable. In the present investigation, all determinations except the hydrogen solubility in nickel were made with the helium method.Addition of copper to molten iron increases the solubility of hydrogen up to 25% Cu, the solubility appears to decrease with further addition. The addition of nickel to liquid Fe-Cu alloys up to 7% Ni has no appteciable effect on the solubility of hydrogen.

根据試驗結果和热力学計算,分析了液态金属氧含量与平衡氫压力、气相中P_(H_2O)/P_(H_2)之比值与平衡氫压力相互之間的关系,以及它們对測量准确度的影响,并且指出,氧越高,則平衡氫压力越低,倘若測量压力超过平衡压力,則消耗的氫将并非完全由于溶解而是部分消耗于生成水汽浣Y果必然导致气相成分不純与水汽凝結于炉壁現象,因而使溶解度数据偏高。在用純铁标定方法时,比較了氩、氦、钼三种測热体积方法,結果表明,在其它試驗条件相同时,由于氬的导热率远泜于氫、固态钼的导热性能远低于熔鉄,都导致溶解度数据偏低。唯有用导热率与氫极为接近的光譜純氦測热体积,才能获得滿意的結果。除純鎳用氩法外,純铁、铁-銅及鉄-銅-鎳合金均应用氦法測氫溶解度。铁-銅合金中,当銅含量小于25%,随着銅含量的上升,氫溶解度显著上升;超过此浓度,氫溶解度又有下降之趋势。在铁-銅液态合金中加入鎳,当镍含量不超过7%时,加入鎳能使合金氫溶解度略微降低而无显著影响。

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.

 
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