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性化学
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     Optimization of Technology Parameter of Ni-P/SiC Wear Resistance Composite Electroless Plating
     Ni-P/SiC耐磨性化学复合镀工艺参数优化
短句来源
     Five representative factors were optimized in wear resistance Ni-P/SiC composite electroless plating through orthogonal test method. The optimum combination of the five factors is it follows , temperature 89 C, pH value 5.1, SiC content 6g/L, stabilizer concentration 1.0mg/L and NiSO4 6H2O concentration 32g/L.
     采用正交试验方法对耐磨性化学复合镀Ni-P/SiC中具有代表性的五种因素进行了优化,得出了温度89℃、pH值5.1、SiC添加量6g/L、稳定剂浓度1.0mg/L及硫酸镍浓度32g/L的最佳方案。
短句来源
     GFL:A Graphic Formal Language for Markush Structure Indexing
     GFL:用于族性化学结构的标引图形形式语言
短句来源
     Five representative factors are optimized in wear resistance Ni-P/SiC composite electroless plating through orthogonal test. The optimum combination of the five factors is as follows ,temperature 89 ℃, pH value 5.1, SiC 6 g/L,stabilizer 1.0 mg/L and NiSO 4·6H 2O 32 g/L.
     采用正交试验对耐磨性化学复合镀 Ni- P/ Si C中具有代表性的五因素进行了优化 ,得出的最佳方案为 :温度89℃ ,p H值 5 .1,Si C添加量 6 g/ l,稳定剂浓度 1.0 m g/ L ,硫酸镍浓度 32 g/ L .
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     Studies on High Corrosion Resistant Chemical Blackening of Steel
     钢铁高耐蚀性化学发黑的研究
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     Chemical radiculitis in lumbar spine
     化学神经根炎
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     The chemical mutagenesis and the gene mutation of inner ear
     化学诱变和内耳基因突变
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     CHAPTER 5 MARINE SEDIMENTATION Section 5 Sedimentary Chemistry
     沉积物化学
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     The Chemistry of Retardation of Combustion
     阻燃化学
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Based on the general principles of chemistry, physical-chemistry and crystallography, the welding metallurgical physical-chemical properties of low hydrogen basic electrodes are investigated in this paper, including such topics as the dehydrogenation by calcium fluoride, the balance amount of calcium fluoride in the slag, the influence of calcium fluoride content in electrode coating on fumes and toxicity, the suppression of the volatilization of NaF and hence the decrease in toxicity by the formation of the...

Based on the general principles of chemistry, physical-chemistry and crystallography, the welding metallurgical physical-chemical properties of low hydrogen basic electrodes are investigated in this paper, including such topics as the dehydrogenation by calcium fluoride, the balance amount of calcium fluoride in the slag, the influence of calcium fluoride content in electrode coating on fumes and toxicity, the suppression of the volatilization of NaF and hence the decrease in toxicity by the formation of the almost non-volatile and insoluble chemical compound NaF-MgF_2, etc. The soluble fluorides formed in small amounts by the interaction of coating materials in electrode making are also studied. The form of manganese existing in the fume is determined by analysis. A new low fume and low toxicity CaO-SiO_2-TiO_2-CaF_2 type coated basic electrode with better welding characteristics is developed, complying with the hygiene and the mechanical property specifications of our national standards.

本文从化学、物理化学、结晶学的原理出发,分析研究了碱性低氢型焊条焊接冶金物理化学特性。其中包括:CaF_2的去氢、CaF_2在渣中的平衡量、药皮中CaF_2含量对发尘致毒的影响,NaF—MgF_2形成难挥发不溶性化学化合物抑制NaF的挥发。降低毒性等。还研究了焊条制造过程中,药皮物质相互作用产生的少量可溶性氟。通过分析确定了烟尘中锰的存在形式。研制成功了卫生指标先进、机械性能符合国标、工艺性能良好的碱性低尘低毒焊条。

Factors of chemical composition and heat treatment of 102 steel had been analysed. The ratio of contents of strong carbide forming elements to carbon, which is usually used to indicate the differences in creep strength of similar steels, has been modified in the light of phase analysis results. Equilibrium condition of carbon(CE)calculated from the modified ratio in atomic percentage has been used as a comprehensive factor in approaching the optimum operational performance index of 102 steel. Regression analysis...

Factors of chemical composition and heat treatment of 102 steel had been analysed. The ratio of contents of strong carbide forming elements to carbon, which is usually used to indicate the differences in creep strength of similar steels, has been modified in the light of phase analysis results. Equilibrium condition of carbon(CE)calculated from the modified ratio in atomic percentage has been used as a comprehensive factor in approaching the optimum operational performance index of 102 steel. Regression analysis shows that there are good correlations between Cu and σ105 620℃ By means of CE. the creep rupture strength of 102 steel under the conditions of known chemical composition and given heat treatment can be estimated. In view of these considerations after discussion several propositions are made for increasing the lower limit of σ105 620℃

本文对影响102钢热强性的化学成分及热处理因素进行了分析。分析前结合相分析结果,通过初步核算,将通常用来定性说明热强性高低的V/C比值作了修正。并据此修正比值按原子百分比计算出的碳的平衡情况(C_E)作为研究性能高低的一个综合因素。回归分析表明C_E和之间有较好的对应关系。用C_E可以对既定化学成分及热处理的钢的持久强度作出估量。通过讨论,对如何提高102钢的下限持久强度等提出了几点建议。

In 20 pentobarbital-anesthetized open-chest dogs, injection of 5-HT (200μg) into left atrium consistently induced an abrupt and marked cardiovascular response which was characterized by increase in arterial mean pressure (Δ67 ± 8 mmHg), ventricular contractile force (Δ61 ± 10%) and cardiac output (Δ83±16%). Such a hypertensive response was significantly diminished or abolished following the cutting of aortic nerves in cervical region, thus indicating that the response was reflex in nature and its afferent fibers...

In 20 pentobarbital-anesthetized open-chest dogs, injection of 5-HT (200μg) into left atrium consistently induced an abrupt and marked cardiovascular response which was characterized by increase in arterial mean pressure (Δ67 ± 8 mmHg), ventricular contractile force (Δ61 ± 10%) and cardiac output (Δ83±16%). Such a hypertensive response was significantly diminished or abolished following the cutting of aortic nerves in cervical region, thus indicating that the response was reflex in nature and its afferent fibers passed through aortic nerves. Injection of 5-HT into pulmonary artery or ascending aorta might evoke similar effect while injection into descending aorta or carotid artery failed to do so. From the results, it is suggested that the well-known groups of chemoreceptor in aortic region are responsible for initiation of this reflex. Although the term "Cardiogenic Hypertensive Chemoreflex" was originally and extensively used by James and his colleagues to describe this reflex, it seems more appropriate for us to consider it an aortic hypertensive chemoreflex in the term of some reasons discussed in our text.

在20只戊巴比妥麻醉后的开胸犬,从左心房迅速注入5-HT(200微克),可规律地引起一个急剧的心血管效应,表现为动脉平均血压显著增高(△67±8毫米汞柱),心缩力加强(△61士10%)和心输出量增加(△83±16%)。在颈部切断两侧主动脉神经,上述效应即行显著减弱或消失,表明此为一反射,其传入通路为主动脉神经。经肺动脉或升主动脉注入上述剂量的5-HT,能诱发类似的心血管效应,而向降主动脉和颈总动脉注射则无效,提示反射的感受器装置可能为主动脉区的各组化学感受器。James及其同事将这一反射命名为心源性高血压性化学反射,并指出其传入通路为迷走神经。根据我们的实验结果,此反射实质上可能就是通常的主动脉区化学感受性反射,上述命名似欠妥贴。对此,文中着重地作了讨论。

 
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