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gradient
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  “gradient”译为未确定词的双语例句
    Analysis of temperture gradient and evaluate the thermal deformation or a vertical lathe column by using finite element method.
    用有限元法分析计算立车立柱的温度场及热变形
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    THE STUDY OF Ni-BASED ALLOY- ZrO_2·Y_2O_3 FUNCTIONALLY GRADIENT MATERIAL
    Ni基合金—ZrO_2·Y_2O_3倾斜功能材料的研究
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    Application and Investigation of Gradient Loaded Column for the Gas Chromatography
    程序涂渍色谱柱的研究及应用
短句来源
    IN SITU GRADIENT DOUBLE LAYER COMPOSITES OF Al Fe ALLOY BY CENTRIFUGAL CASTING
    IN SITU GRADIENT DOUBLE-LAYER COMPOSITES OF Al-Fe ALLOY BY CENTRIFUGAL CASTING
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    The XRD results show that the gradient coating has a B1(NaCl) structure with(220) preferred orientation.
    X射线衍射的结果表明涂层为B1型(NaCl)单相结构,具有(220)择优取向.
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  gradient
A convexity theorem for noncommutative gradient flows
      
In this survey we shall prove a convexity theorem for gradient actions of reductive Lie groups on Riemannian symmetric spaces.
      
In the final section the theorem is applied to gradient actions on other homogeneous spaces and we show, that Hilgert's Convexity Theorem for moment maps can be derived from the results.
      
We observe that our methods clearly show that the restriction p>amp;gt;2n/n+1 is closely related to cancellation and size properties of the gradient of the Poisson kernel.
      
A new generalized gradient projection type algorithm for linearly constrained problems
      
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B, B+N, Y, Ce and rare-earth mixture (0.1—0.2%)were added respectively to the catalytic alloys Ni_(40) Mn_(30) Fe_(30). Experimental results indicate that the oxidation resistance of the diamonds increased greatly, and the mean compressive strength slightly, by the catalytic alloy containing boron (or boron and nitrogen). This catalyst may be widely applied to the synthesis of dark diamonds containing boron. As for rare-earth elements, there are some influences too.Samples of catalytic alloys containing and...

B, B+N, Y, Ce and rare-earth mixture (0.1—0.2%)were added respectively to the catalytic alloys Ni_(40) Mn_(30) Fe_(30). Experimental results indicate that the oxidation resistance of the diamonds increased greatly, and the mean compressive strength slightly, by the catalytic alloy containing boron (or boron and nitrogen). This catalyst may be widely applied to the synthesis of dark diamonds containing boron. As for rare-earth elements, there are some influences too.Samples of catalytic alloys containing and non-containing small amount elements were assembled half and half symmetrically in a reaction vessel to set up the horizontal concentration gradient of small-amount doping atoms. The influences of small-amount elements such as boron upon the synthesis of diamonds under high-pressure and high-temperature were investigated, thus obtaining some useful results.

在Ni_(40)Mn_(30)Fe_(30)触媒合金中加入了(0.1—O.2%)的B,B+N,Y,Ce,混合稀土。含B(或B+N)的触媒,明显地提高了金刚石的抗氧化性能,对平均抗压强度也有提高;此种触媒可以推广应用。稀土元素也有一定的作用。 我们把含有和不含有微量元素的Ni_(40)Mn_(30)Fe_(30)触媒片分半对称地组装在同一高温高压反应腔中,造成水平方向的微量掺杂原子的浓度梯度,研究了硼等微量原子对高温高压合成金刚石的影响,得到了一些有益的结果。

An investigation of the first kind migration process of carbon has been carriedout on the welded joints of a 12AlMoV steel by means of microscopy, EPMA anddilatometry. It is shown that this carbon migration is caused by the existance ofa significant activity gradient of carbon between the two sides of fusion line. Thismay take place as a result of the earlier precipitation of pro-eutectoid ferrite onone side of the fusion line within a temperature range that rapid diffusion ofcarbon atoms occurs. This...

An investigation of the first kind migration process of carbon has been carriedout on the welded joints of a 12AlMoV steel by means of microscopy, EPMA anddilatometry. It is shown that this carbon migration is caused by the existance ofa significant activity gradient of carbon between the two sides of fusion line. Thismay take place as a result of the earlier precipitation of pro-eutectoid ferrite onone side of the fusion line within a temperature range that rapid diffusion ofcarbon atoms occurs. This confirms the activity reasoning proposed by the authorfor carbon migration. The difference of the activity coefficient of carbon caused by different crystalstructures is larger than that caused by different compositions of the alloys forthese welded joints. Hence, it is the main thermodynamic condition accountingfor this kind of carbon migration. From kinetic point of view, the degree ofcarbon migration increases with the duration under certain temperatures. Changingthe composition as well as modification of welding technology have been proposedso as to retard or suppress the carbon migration in the welded joints of the steel.

用金相、电子探针、膨胀分析等对12AlMoV钢焊接接头第一类碳迁移过程进行了研究.结果证明,发生这类碳迁移是由于在碳快速扩散的温度范围,熔合线一侧较早地析出先共析铁素体,使熔合线两侧存在显著的碳活度差所产生.从而验证了作者等提出的焊接接头碳迁移的活度原理. 对这类接头,晶体结构的不同所引起碳活度系数的差别,较之合金成分的不同引起的差别为大.前者是发生第一类碳迁移的主要的热力学条件.从动力学方面考虑,碳迁移进行的程度,与一定温度下的保持时间有关. 为减弱和抑制12AlMoV钢焊接接头碳迁移,并提出了合金化和焊接工艺措施.

The nucleation and propagation of stress corrosion cracking(SCC) and hydrogen-induced delayed cracking(HIDC) in various hydrogenant environments, such as H2S and H2 gases, water, aqueous solution of H2S and charging were followed metallographically, using polished WOL type constant deflection specimen. The results of investigation show that if KI>KI cc and the strength of steel is larger than a critical value, the size of the plastic zone and the degree of plastic deformation ahead of the crack is enlarged continuously...

The nucleation and propagation of stress corrosion cracking(SCC) and hydrogen-induced delayed cracking(HIDC) in various hydrogenant environments, such as H2S and H2 gases, water, aqueous solution of H2S and charging were followed metallographically, using polished WOL type constant deflection specimen. The results of investigation show that if KI>KI cc and the strength of steel is larger than a critical value, the size of the plastic zone and the degree of plastic deformation ahead of the crack is enlarged continuously with time, i. e. a hydrogen-induced delayed plasticity(HIDP) is observed and SCC and HIDC then nucleate and propagate when HIDP develops to a critical condition. For charging specimen, HIDC nucleated preferentially on the surface of a specimen, then HIDP on the surface of the specimen was not caused by pre-produced crack in the interior of the specimen.The effect of hydrogen on the apparent yield strength of a smooth tensile and precrack twist specimen are insignificant. However, for the bending or I and I -III complex precrack specimen with a tensile stress gradient, hydrogen decreases the apparent yield stress considerably if the strength of steel and amount of hydrogen exceed critical values. This is the cause of HIDP and then HIDC. The variation of the KI sec and da/dt with the strength of steel and the environments has been explained.The effect of loading rate, test temperature and pre-plastic deformation on hydrogen induced apparent yield stress reduction have been investigated. According to these results, a new mechanism of SCC or HIDC in low-alloy steels has been discussed.

用抛光的恒位移试样对不同强度的四种低合金钢在各种致氢环境(如电解充氢,H_2和H_2S气体,水.H_2S水溶液等)下,跟踪观察了应力腐蚀裂纹和氢致滞后裂纹的产生和扩展过程。结果表明,当钢的强度和K_1大于临界值后,在任何一种致氢环境中都能产生氢致滞后塑性变形,即随着原子氢的扩散进入,原裂纹前端塑性区及其变形量逐渐增大。当这个氢致滞后塑性变形发展到临界状态时,就会导致氢致滞后裂纹的形核和扩展。 用光滑拉伸试样,弯曲试样,Ⅰ型,Ⅲ型以及Ⅰ-Ⅲ复合型预裂纹试样研究了氢对表观屈服强度的影响。结果表明,对光滑拉伸和预裂纹扭转试样,氢对屈服强度的影响是不明显的。但如试样中存在拉应力梯度(如弯曲试样,Ⅰ型或复合型预裂纹试样),当钢的强度和进入的氢量超过临界值时,氢就能明显地降低表观屈服强度,这就是氢致滞后塑性变形的原因。根据表观屈服强度对进入的氢量和强度的依赖关系,可以解释K_(lscc)和da/dt对强度和环境的依赖关系。 研究了变形速度,试验温度以及预先塑性变形程度对氢致表观屈服强度下降的影响。在此基础上探讨了氢使表现屈服强度下降的原因。

 
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