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Chemical and physical reactions during the low temperature aqueous chemical synthesis of nanostructured Bi2Te3 powders were investigated in-situ by pH measurement, color observation of the solution and X-ray diffraction analysis of the powders.
      
Preparation and characterization of ZrWMoO8 powders with different morphologies
      
ZrWMoO8 powders with different morphologies were obtained using ammonium tungstate, molybdate tungstate and zirconium tungstate as the starting materials by dehydrating the precursor ZrWMoO7(OH)2(H2O)2.
      
TEM photographs of synthesized powders from the sol-gel auto-combustion showed that the crystallites were uniform in size.
      
The magnesium powders used in the fabrication process include nanometer-sized magnesium particles, powders from Alfa Aesar, ordinary off-the-shelf powder, and magnesium chip.
      
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Many oxides of heavy metals when existing not in exact stoichiometric combining ratios exhibit the properties of a semi-conductor.The resistance ofsuch materials has a very large negative temperature coeffcient.Such thermallysensitive resistors,known as“thermisters”,have found wide range of appli-cations in thermometry,communication engineering,etc.In this investigationwe tried over hundred samples of metallic oxides and their mixtures fusedwith glass powder to form small compact bead on Pt lead wires.The...

Many oxides of heavy metals when existing not in exact stoichiometric combining ratios exhibit the properties of a semi-conductor.The resistance ofsuch materials has a very large negative temperature coeffcient.Such thermallysensitive resistors,known as“thermisters”,have found wide range of appli-cations in thermometry,communication engineering,etc.In this investigationwe tried over hundred samples of metallic oxides and their mixtures fusedwith glass powder to form small compact bead on Pt lead wires.The sampleswere treated by a new firing technique which is very convenient in laboratory.Some samples made from mixed oxides of Mn,Co and Ni showing a resistanceof 10~4-10~5 ohms at room temperature and 10-100 ohms at 500℃ seem.verypromising for practical purposes.

多种重金属的氧化物,经高温煅烧后,均可呈现电子性半导体的性质,其电导随温度急剧变化,故可作测量温度之用,通常称热感电阻。从电导的对数与温度的倒数的图中,可以推算半导体电导性所需的电子能位差。本文试验氧化物混入玻璃粉制成的小珠,用半导体体内电热法制成热感电阻,在常温时的电阻值为10~4—10~5欧姆,在500℃时只有10—100欧姆。半导体与铂导体线间的电性接触,经实验推知是良好的。这种制备方法,在实验室里,非常简易。经多次试验,以混合锰、钴、镍的氧化物和玻璃粉制成的电导性较大,有实用价值。

By means of the Bitter pattern, the domain structure of the ferromagnetic ζ-phase in Mn-Al system was investigated by using polycrystalline specimens. The patterns show either fairly straight lines or wavy and even more complicated forms. No lace-like pattern has been observed, however. Based on the magnetic properties of the phase and on the effects of orientations and sizes of the crystallites, it has been inferred that the ζ-phase has a domain structure typical of uniaxial ferromagnetics with large magnetic...

By means of the Bitter pattern, the domain structure of the ferromagnetic ζ-phase in Mn-Al system was investigated by using polycrystalline specimens. The patterns show either fairly straight lines or wavy and even more complicated forms. No lace-like pattern has been observed, however. Based on the magnetic properties of the phase and on the effects of orientations and sizes of the crystallites, it has been inferred that the ζ-phase has a domain structure typical of uniaxial ferromagnetics with large magnetic anisotropy but owing to the minute size of the crystallite the domain structure is more or less simplified as no spike-in domains are formed. In the pulverized specimen, regions deposited with magnetic powders can be easily observed and they have been tentatively identified as single domain particles.

用Bitter粉紋,观察了Mn-Al合金系中新近才确切了解的铁磁性ζ相(据K(?)ster和Wachtel的命名)的磁畴結构。样品为多晶。粉紋显为近平行的直綫或波紋或另外一些較复杂的图案。没有看到花边式粉紋。基于相的基本磁性、晶体取向和尺度的討論推断,ζ相取典型单易磁化軸其磁各向异性很大的材料所具有的磁畴結构,但由于晶体尺度的限制,磁畴結构有所簡化而无釘形楔入畴。經粉碎的样品中,易見磁粉沉积区,认定其为单畴顆粒。

The thermo-stability of K_2TaF_7 in air and argon atmosphere was investigated by means of thermo-differential, thermo-gravimetric and chemical analyses and also X-ray powder diffraction method. An obvious heat-absorbing effect was observed at 218°±3℃ with the appearance of break-up of larger crystals. The melting point of K_2TaF_7 was measured to be 730°±3℃. During the course of heating, by the action of moisture in air, K_2TaF_7 was hydrolyzed into K_2TaO_2F_3 which is soluble in molten K_2TaF_7 and thus...

The thermo-stability of K_2TaF_7 in air and argon atmosphere was investigated by means of thermo-differential, thermo-gravimetric and chemical analyses and also X-ray powder diffraction method. An obvious heat-absorbing effect was observed at 218°±3℃ with the appearance of break-up of larger crystals. The melting point of K_2TaF_7 was measured to be 730°±3℃. During the course of heating, by the action of moisture in air, K_2TaF_7 was hydrolyzed into K_2TaO_2F_3 which is soluble in molten K_2TaF_7 and thus affects its melting point. This might throw light on the disagreement of the melting points of K_2TaF_7 determined by the various authors. The end product of hydrolysis of K_2TaF_7 was identified to be KF and KTaO_3 (potassium meta-tantalate). Finally, the different stages of hydrolytic reaction of K_2TaF_7 and its relation with various temperatures were discussed.

用热差分析、热重分析、化学分析及X射线粉末衍射法研究了K_2TaF_7在空气中和氩气氛中加热时的行为.发现在218°±3℃,有一显著的吸热效应,同时发生晶体破碎.测得K_2TaF_7的熔点为730°±3℃.当加热时,K_2TaF_7同空气中的水气起水解作用,水解产物能溶于K_2TaF_7熔体而影响其熔点.这可能是过去测定的熔点不一致的原因.确定了水解最终产物为氟化钾及偏钽酸钾.最后,讨论了水解反应的步骤及其与溫度的关系.

 
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