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61.
多相高分子快离子导体阻抗谱的研究 总被引:1,自引:0,他引:1
研究了以LiClO4掺杂的聚乙二醇聚氨酯双离子导体及磺酸型聚乙二醇聚氨酯离聚物单一离子导体的阻抗谱,给出了多相快离子导体交流阻抗测试系统的等效电路.通过阻抗谱计算机解析,计算得出了样品的基本电学参数.通过讨论界面阻抗的色散现象,计算出样品的离子电导率,和阻抗谱解析法得到的结果相一致. 相似文献
62.
B. Pes J.M. Paul J.M. Corpart M. Sindt J.L. Mieloszynski 《European Polymer Journal》2004,40(12):2727-2730
A series of ω-perfluorooctyl-alkyl polyacrylates has been prepared and analysed. The odd–even effect, already observed in the case of liquid crystalline polymers has been exhibited for perfluorinated ones. Values of the contact angles to advanced (θa), with withdrawal (θr), as well as the contact angle hysteresis (Δθ) of various ω-perfluorooctyl-alkyl polyacrylates in water at 20 °C are described. Contrary to the advancing contact angle which is almost independent of spacer length, the receding one varies strongly with it. 相似文献
63.
Manfred Leisch 《Mikrochimica acta》1992,107(3-6):95-104
The atom probe field ion microscope (AP-FIM) is a combination of a field ion microscope and a time-of-flight mass spectrometer with a single ion detection sensivity. With the field ion microscope topology of a surface, surface reactions and surface modifications can be studied in atomic detail. By time-of-flight measurements surface layers and interface layers can be chemically analyzed atom by atom and atomic layer by atomic layer. Compositional variations according to surface or interface segregation, precipitations, or surface changes in corrosion or in electrochemical layer formation etc. can be studied quantitatively on a subnanometer scale. Some of our studies on related problems will be decribed briefly. 相似文献
64.
65.
The boundary effect on the drag on two identical, nonuniformly structured flocs moving along the axis of a cylindrical tube
filled with a Newtonian fluid is investigated at a small to medium larger Reynolds number. A two-layer model is adopted to
simulate various possible structures of a floc, and the flow field inside is described by Darcy–Brinkman model. The results
of numerical simulation reveal that a convective flow is present in the rear region of a floc when Reynolds number is on the
order of 40. The presence of the tube wall and/or the porous structure of a floc has the effect of reducing that convective
flow. For a fixed level of the volume-average permeability of a floc, the influence of the tube wall on the drag depends upon
floc structure; the influence on a nonuniformly structured floc is more significant than that on a uniformly structured floc.
The more nonuniform the floc structure, the more appreciable the deviation of the drag coefficient–Reynolds number curve from
a Stokes’-law-like relation becomes. The smaller the volume-average permeability of a floc and/or the smaller the separation
distance between the two flocs, the greater is the deviation, but the presence of the tube wall has the effect of reducing
that deviation. 相似文献
66.
《Surface and interface analysis : SIA》2006,38(9):1249-1251
Progression studies have been followed from Cu(111)‐ and Cu(100)Sn binaries to Cu(111)‐ and Cu(100)SnSb ternary‐alloy systems under the same experimental conditions. The segregation behaviour of Sn in the two orientations are explained. It is found that the kinetic segregation profiles of Sn in the ternary alloys shift to lower temperatures as compared to that in the binary. The Sn profile shift is mainly due to the decrease in the activation energy of Sn in the ternary systems. For a particular Cu orientation, the other segregation parameters that the Sn profiles depend on, like the pre‐exponential factor, segregation energy and the interaction coefficient, are found to be the same in the two systems. There is also a change in the equilibrium segregation profiles of Sn. In the ternary system, site competition between Sn and Sb causes the Sn to suffer exponential desegregation and eventual displacement from the surface. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
67.
We studied the Y–Ba–Cu–O/Ag equilibrium diagram in oxygen atmosphere around the composition YBa2Cu3Ox/Ag35 mass%. We found a high thermal effect: the peritectic decomposition temperature of Y-123 phase is lowered from 1040
to 940°C. We demonstrate here that the nature of the phenomenon is not chemical. We explained it as the result of a mechanical
segregation of Y-123 decomposition products from Y-123 phase, performed by silver.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
68.
A. Daoudi A. Anakkar J. -M. Buisine F. Bougrioua N. Isaert H. T. Nguyen 《Journal of Thermal Analysis and Calorimetry》1996,46(2):337-345
Effects of high pressures on phase sequences of the two homologousn=16 andn=18 of the (3-fluoro-4 ((R) or (S)-methylheptyloxy) 4, (4-fluoro benzoyloxy) tolans) series have been studied. Both compounds exhibit the new twisted Smectic A phase called Twist Grain Boundary TGBA phase. The high pressure experiments were performed by thermobarometric analysis. The order of the transitions (first or second) have been determined in respect to pressure and temperature. The pressure-temperature phase diagrams show that the TGBA phase is stabilized by increasing pressure; an inducedN
* phase appears under high pressure for n=18 leading to the observation of TGBA-N
*-I triple point. 相似文献
69.
在静止中和反应界面的基础上,提出了静止化学反应界面的概念,导出了一些静止化学反应界面方程。这些方程显示:为了建立稳定的静止化学反应界面,正、负反应离子(比如氢离子和氢氧根离子)的迁移数必须相等。分析表明,方程的理论预测与下列事实定量吻合:(1)已建立的静止中和反应界面的实验,(2)基于Kohlrausch′s调整函数的计算机模拟。 相似文献
70.