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mechanisms     
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  机制
     Studies on the expression and mechanisms of p16~(INK4a)gene in human pancreatic adenocarcinoma
     P16~(INK4a)基因在人胰腺癌中的表达及其作用机制的研究
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     The Mechanisms of International Short-term Capital Movements
     国际短期资本的流动机制
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     Mechanisms of Infection and Colonization of the Dominant Endophyte Pantoea agglomerans YS19 on Host Rice Plant
     水稻内生优势成团泛菌YS19对宿主侵染和定殖机制的研究
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     Study on the antitumor effect of linomide in treatment of human squamous cell carcinoma of tongue and its related mechanisms
     三羧氨基喹啉(Linomide)对人舌鳞状细胞癌的治疗作用及其机制研究
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     The mechanisms of abnormality of Langerhans cells from patients with psoriasis
     银屑病患者朗格汉斯细胞异常机制的研究
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  机理
     A Study of the Processing and Mechanisms of Grain Refinement by the Addition of Refiners for Superalloy K4169
     K4169高温合金化学法晶粒细化工艺及机理的研究
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     Observation of clinical curative effect of Liandai capsule for gastrointestinal neoplasms and study on its molecular mechanisms
     连黛胶囊治疗胃肠肿瘤临床疗效观察与分子机理研究
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     The Mechanisms of Effect and Regulation of Mitogen Activated Protein Kinases(MAPKs)Signal Transduction Following Traumatic Brain Injury
     脑创伤后丝裂原活化蛋白激酶信号转导的作用及调控机理
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     1.The Inhibitory Mechanisms of the TLSF_(JM) and the Role of Regulatory T Cells On Allograft Rejection in Rat Heterotopic Small Bowel Transplantation
     一、大鼠小肠移植耐受中调节性T细胞作用及TLSF_(JM)免疫抑制作用的机理研究
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     Effects and Mechanisms of Differentiation Induced by Tachyplesin on the Human Hepatocarcinoma SMMC-7721 Cells
     中国鲎鲎素对人肝癌SMMC-7721细胞诱导分化作用与机理研究
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  机构
     Study on Analysis and Design of Overconstraints and Self-adjusting Structures for Planar Linkage Mechanisms
     平面连杆机构的过约束及自调结构的分析与设计研究
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     A Level Set Method for Topological Optimization and Its Application in Stiff Structures, Compliant Mechanisms and Material Designs
     拓扑优化的水平集方法及其在刚性结构、柔性机构和材料设计中的应用
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     The Analytical Terminal Constraints Theory and Mathematics Method for the Degrees of Freedom of Spatial Parallel Mechanisms
     空间并联机构自由度的终端约束分析理论与数学描述方法
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     Topology Optimization of Structure and Compliant Mechanisms
     结构与柔性机构拓扑优化
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     Active Vibration Control of Flexible Linkage Mechanisms Using Neural Networks
     基于神经网络的弹性连杆机构振动主动控制理论、方法与实验研究
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  作用机制
     Studies on the expression and mechanisms of p16~(INK4a)gene in human pancreatic adenocarcinoma
     P16~(INK4a)基因在人胰腺癌中的表达及其作用机制的研究
短句来源
     The Responses of Monocytes/Macrophages to LPS and CpG Oligodeoxynucleotides and Their Related Mechanisms
     LPS和CpG寡聚DNA对单核巨噬细胞的效应和作用机制的研究
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     The Study on the Mechanisms of FTY720 and the Induction of Transplantation Immune Tolerance with this New Immunosuppressant
     FTY720作用机制及诱导移植免疫耐受的研究
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     Ecophysiological Adaptation Characteristic of Halophytes in Xingjiang Province and the Mechanisms of Silicon to Salt Resistance
     新疆盐生植物生理生态适应性及硅提高植物抗盐作用机制的研究
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     Effects and Mechanisms of the Transgenic Cry1Ac Plus CpTI (Cowpea Trypsin Inhibitor) Cotton on Insect Communities
     转双价基因(Cry1Ac+CpTI)棉对昆虫群落的影响及其作用机制
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      mechanisms
    Mechanisms and Issues Relating to the Use of D1-like Dopamine Receptor Agonists for Age-related Illnesses: Parkinson's Disease a
          
    Novel Mechanisms of Drug Action: Functional Selectivity at D2 Dopamine Receptors
          
    Alpha2-Adrenergic Receptors in Intestinal Epithelial Cells: Mechanisms of Signaling, Role, and Regulation
          
    Alpha2-Adrenergic Receptors in Intestinal Epithelial Cells: Mechanisms of Signaling, Role, and Regulation
          
    (iii) Yet other compounds, acting by novel mechanisms, have recently been identified as anti-HIV agents that seem worthy of further (pre)clinical development: cell receptor CD4 downmodulators (i.e.
          
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    The present work extends the obserwtion of an earlier report and Shows that the conduction block in nerve produced by cocaine, procaine, urethane, isotonic choline chloride, TEPP and DFP, though not accompanied by any lowering of membrane potential, can be relieved by anodal current. It follows that the mechanism of anodal relief of block can not be supposed to be simply a restoration of previously lowered membrane potential. With eserine, although depolarization occurs, the block develops. long before,...

    The present work extends the obserwtion of an earlier report and Shows that the conduction block in nerve produced by cocaine, procaine, urethane, isotonic choline chloride, TEPP and DFP, though not accompanied by any lowering of membrane potential, can be relieved by anodal current. It follows that the mechanism of anodal relief of block can not be supposed to be simply a restoration of previously lowered membrane potential. With eserine, although depolarization occurs, the block develops. long before, the start of the depolarization; thus the anodal relief of the block produced by eserine likewise cannot be simply due to a restoration of polarization. Successful anodal relief of block somehow depends upon the initial state of the nerve. For instance, it is better in a freshly dissected nerve than in a nerve after several hours soaking in Ringer; better in a nerve having had prolonged soaking in Ringer with somewhat raised potassium concentration than in a potassium-free Ringer. It seems that any prior treatment causing a decrease of the potassium content of the nerve, tends to make anodal current less effective in relieving conduction block.

    本文研究可卡因、普魯卡因、氨甲酸乙酯、氯化膽鹼、依色林、TEPP及DFP在兩棲類神經所產生的傳導阻遏。上述各種傳導阻遏的特點,是或者根本沒有膜電位的降低与之相伴,或者膜電位的降低發生在傳導阻遏之後。但是在一定條件下,陽極電流對於這些傳導阻遏都有解除作用。陽極電流對上述由於可卡因、普魯卡因、氨甲酸乙酯及氯化膽鹼所產生傅導阻遏的解除效應,與神經原來的狀態有关。一般地說,凡試驗前的預先處理,有減低神經鉀含量的影響者,亦有使陽極電流的解除效應減弱的傾向。

    Hair-line cracks or flakes in steel are known to be associated with the presence of hydrogen. A prevailing theory states that the crack formation is due to disruptive hydrogen pressure being built up in defects in steel. However, little was known regarding to the nature of these defects and the detailed mechanism of the hair-line crack formation. An attempt was made in the present research to investigate this problem by means of internal friction measurements. The preliminary experiments show: (1) The...

    Hair-line cracks or flakes in steel are known to be associated with the presence of hydrogen. A prevailing theory states that the crack formation is due to disruptive hydrogen pressure being built up in defects in steel. However, little was known regarding to the nature of these defects and the detailed mechanism of the hair-line crack formation. An attempt was made in the present research to investigate this problem by means of internal friction measurements. The preliminary experiments show: (1) The presence of hydrogen in certain steels may give rise to the appearance of an internal friction peak when internal friction is plotted against the temperature of measurement; (2) a slight amount of cold-work or soaking at a given temperature has a considerable effect on the optimum temperature of the observed internal friction peak, which indicates that the internal friction peak may be connected with the defects or stress condition in steel; (3) the internal friction peak shows an anomalous amplitude effect, i.e., at a given temperature of measurement an internal friction peak is obtained when the internal friction is plotted against the stress amplitude. Such an anomalous behavior is similar to that previously observed by. one of the authors (Ke) in the case of aluminimum containing 0.5% Cu. It is therefore considered that the internal friction peaks observed may be related to the interaction of hydrogen with the dislocations in steel.

    钢的内部发裂已经公认为与钢中的氢气有关。现有的理论认为这是由于氢气聚集于钢中的内部缺陷产生破裂压力所引起,然而关于缺陷的性质和引起内部发裂的详细机构迄今还没有明确的了解。本文尝试用内耗测量的方法来研究这个问题。初步实验的结果指出: (1)氢在钢中可以引起内耗峰(将内耗表示为测量温度的函数时); (2)轻微冷加工或保温对于内耗峰的颠值温度有着显著的影响,这表示所得的内耗峰与钢中的缺陷和应力状态有关系; (3)所得的内耗峰表现有反常的振幅效应,即在一定的观测温度时,如将内耗表示为外加应力的函数,则也得到一个内耗峰。这与本文作者之一以前在铝铜合金中所观测到的反常内耗峰的性质和表现相同,因而所得的内耗峰可能是由于氢与钢中的原子脱节的交互作用所引起来的。

    Creep under very small torsional stress has been investigated for 99.95% polycrystalline iron in the temperature range of 350°-525℃. The general features of the creep curves obtained are essentially the same as those previously reported for 99.991% aluminum. The creep is shown to be consisted of two parts, one occurring at lower temperatures or shorter times and the other at higher temperatures or longer times. The first part of the creep is limited in extent and is associated with the viscous behavior of grain...

    Creep under very small torsional stress has been investigated for 99.95% polycrystalline iron in the temperature range of 350°-525℃. The general features of the creep curves obtained are essentially the same as those previously reported for 99.991% aluminum. The creep is shown to be consisted of two parts, one occurring at lower temperatures or shorter times and the other at higher temperatures or longer times. The first part of the creep is limited in extent and is associated with the viscous behavior of grain boundaries. The activation energy for this grain-boundary creep is 78,000 ± 4,000 calories per mole according to the present creep and stress relaxation measurements. This value is close to the activation energy for self-diffusion of iron, a correlation which indicates that, in so far as to the mechanism of atomic migration is concerned, grain boundaries may not be very different from the interior of the grains.

    用99.95%的多晶纯铁作了从350°-525℃的扭转微蠕变及应力弛豫试验,所得结果的概貌与以前用多晶纯铝所得的基本上相同。从蠕变曲线上可以看出这蠕变是由两部分组成的:第一部分是在较低温度或较短时间内发生的,第二部分是在较高温度或较长时间内发生的。第一部分的蠕变是有限的,是由于晶粒间界的粘滞性滑移所引起。根据微蠕变及应力弛豫测量的结果,这一部分蠕变所包含的激活能是78,000±4,000卡/克分子。这个激活能(晶粒间界滑移激活能)的数值与纯铁自扩散的激活能很相近,表示晶粒间界与晶粒内部对于原子迁移的基本过程而言并没有显著的差异。 加碳于纯铁中对于这两部分的蠕变都有显著的影响。最值得注意的结果是含碳量少到0.0004%时已经使晶粒间界的粘滞性滑移受到显著的阻碍。这些发现在控制金属高温蠕变的问题上指出一个一般性的原则,对于以前所提出来的晶粒间界空穴模型也提供了一些新的实验证据。 根据加碳的实验结果,对于第二部分高温蠕变的机构也提出了一个初步的看法,这蠕变所包括的基本过程可能是晶粒内部的空穴中的原子重新排列。

     
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