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Because of its extensive applying prospect, magnetorheological fluid and its device have been concerned by many domain,but the lack of good magnetorheological fluid that can be used in real engineering is hindering the developing of this technology. Firstly, from the direction of the mechanism of rheologic and its performance objective, the principles of components of magnetorheological fluid selecting and their affects on fluid’s performance are studied. Secondly, the technology of disperse is researched. At last, the performance of a kind of magnetorheological fluid that made by the above principles is introduced. 相似文献
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建立了气相色谱-质谱/选择离子监测方法,对皮革及其制品中21种有害有机溶剂的残留量进行了同时测定。该方法以乙酸乙酯为萃取溶剂,45℃下超声萃取皮革及其制品中残留的有害有机溶剂,萃取液经固相萃取柱净化后进行气相色谱-质谱/选择离子监测法分析,外标法定量。结果表明,在信噪比(S/N)为10的条件下,乙二醇二丁醚(EGDBE)、三乙二醇二甲醚(TEGDME)、二乙二醇单丁醚(DEGBE)和三乙二醇单乙醚(TEGEE)的定量下限均为50μg/kg,N-甲基乙酰胺(MA)和N-甲基甲酰胺(MF)的定量下限均为150μg/kg,甲酰胺的定量下限为300μg/kg,其余14种组分的定量下限均为100μg/kg。在3个不同加标水平下,方法的平均加标回收率为82.1%~94.9%,相对标准偏差(RSD,n=9)为1.6%~4.8%。该方法简单快捷,灵敏度高,可用于皮革及其制品中有害有机溶剂残留量的测定。 相似文献
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建立了同时测定皮革及其制品中5种限用酰胺类溶剂残留量的气相色谱-串联质谱分析方法。以甲醇为萃取溶剂,微波萃取皮革及其制品中残留的限用酰胺类溶剂,萃取物经固相萃取柱净化后,进行气相色谱-串联质谱分析,外标法定量。在优化条件下,甲酰胺、N-甲基甲酰胺、N,N-二甲基甲酰胺、N-甲基乙酰胺、N,N-二甲基乙酰胺的定量下限(LOQ,S/N=10)分别为20,10,1,20,3μg/kg。在3个不同加标水平下,方法的平均加标回收率为81.4%~86.9%,相对标准偏差(RSD,n=9)为4.5%~8.7%。该方法简便快速,灵敏度高,定量下限远小于REACH法规的限量要求,可完全满足皮革及其制品中限用酰胺类溶剂残留量检测工作的要求。 相似文献
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Denis Paudecerf 《Acta Mechanica Solida Sinica》2009,22(1):37-44
We study experimentally the microstructure and mechanical behavior of natural cow leather. Tensile tests are performed using leather strips to observe their deformation, creep and failure. It is found that the microstructure of cow leather is a layered, complicated network of fibers of different sizes from a few to a few hundreds of nanometers in diameter. They show nonlinear stress-strain relations and viscoelastic behavior. The effect of humidity is also examined. A simple theoretical model of a multilayered beam is proposed to describe the most basic behavior in tension. 相似文献
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数显温控计的设计与制作 总被引:1,自引:1,他引:0
用集成电路温度传感器AD590及A/D转换器7107等器件,制作了高精度数显温控计。 相似文献
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The Sensitivity of Residual Stresses of Cross-Ply Laminates to Manufacturing and Material Parameters 总被引:1,自引:0,他引:1
By using a finite-element model elaborated, the sensitivity of residual stresses of polyester/glass cross-ply laminates to manufacturing and material parameters is investigated. The development of residual stresses in the laminates and the significance of the parameters for the problem are discussed. It is found that the main attention in calculating residual stresses should be focused on the properties of resin, which must be measured with care. The most important parameters related to the resin are, of course, its stiffness, thermal expansion, and chemical shrinkage, while the properties of fibers can be obtained from material handbooks with a sufficient accuracy. In curing a thin laminate in an autoclave, the simulation of chemical reactions and the parameters needed in thermal analysis are quite insignificant, because, in practice, the autoclave temperature and the properties of the mold determine the laminate temperature history. 相似文献