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101.
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Asymmetric first‐order transition and interlocked particle state in magnetocaloric La(Fe,Si)13
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Anja Waske Lars Giebeler Bruno Weise Alexander Funk Manuel Hinterstein Markus Herklotz Konstantin Skokov Sebastian Fähler Oliver Gutfleisch Jürgen Eckert 《固体物理学:研究快报》2015,9(2):136-140
In‐situ synchrotron XRD measurements of the magnetocaloric material LaFe11.8Si1.2 are used to understand virgin effects and asymmetry of the underlying first order magnetovolume transition. A remarkable change of the transition kinetics occurs after the first cycle, which we attribute to the formation of cracks originating from the volume change. Tomographic imaging revealed that the bulk material disintegrates via an interlocked state where fragments are loosely connected. Though cracks have opened between the fragments, the transition is sharp, which we attribute to magnetostatic interactions. In the cycled sample we find a strong asymmetry between the transition interval upon heating and cooling, which we explain by isostatic pressure acting on parts of the sample during the cooling transition. (© 2015 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim) 相似文献
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Diffusion emission model for solid-state photon-enhanced thermionic emission solar energy converters
Solid-state photon-enhanced thermionic emission (PETE) solar energy converters are new devices that can directly convert solar energy into electrical power at elevated temperatures. This study proposes a new solid-state PETE device structure with a p-type doped semiconductor as the absorber. A model based on a 1D steady-state continuity equation is presented to simulate the diffusion and emission of photogenerated carriers and to calculate the efficiencies. This model can evaluate the effect of device structure and material parameters on performance and efficiency. Calculation results show that the new device is more efficient compared with the original device. A longer electron diffusion length is favourable for enhancing efficiency. Moreover, the optimal absorber thickness is predicted. Our analyses also show that the front interface strongly affects conversion efficiency, which emphasises the need to reduce interface recombination losses. The results of this study may serve as bases for the optimum design of practical solid-state PETE devices. 相似文献
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随着我国经济的不断发展使得人们对生活质量的要求不断提高,而科学技术的发展也为我国制冷与空气调节电气技术的发展提供了技术支持,制冷与空气调节电气技术的发展改善了人们的生活,使得人们生活越来越舒适。制冷与空气调节电气技术的发展同样使得我国经济持续稳定的发展,对于社会的和谐发展也使具有重要的意义。 相似文献
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Conventional compression-refrigeration systems not only consume a large amount of electric power, but also cause serious environmental pollution. Among the various possible approaches in overcoming these two problems, a steam-ejector refrigeration system is believed to be most effective. This paper experimentally investigates the controlling parameters of a steam ejector, including operating conditions and the exit Mach number of the primary nozzle. Operation maps useful to the practical design are constructed from experimental results, and the empirical equations are correspondingly derived. Excessively increasing the exit Mach number of primary nozzle is unnecessary, and 4.35 should be a moderate value. With regard to the performance characteristics of the ejector itself, a steam ejector is better than an R114 ejector and is comparable to an R113 ejector. Moreover, with the use of a two-stage ejector, the required pressure to drive a steam ejector is reduced, and the low-grade heat source can be efficiently used. The results of primitive observation of the flow field are also discussed in this work. 相似文献
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使用多齿席夫碱配体(H2L=pyridine-2-carboxylic acid (3,5-di-tert-butyl-2-hydroxy-benzylidene)-hydrazide)分别与Gd (dbm)3·2H2O (Hdbm=二苯甲酰基甲烷)及Gd (NO)3·6H2O反应,通过溶剂热法得到了2个新的Gd2配合物[Gd2(L)2(dbm)2(C2H5OH)2](1)和[Gd2(L)2(HL)2(DMF)]·2CH3CN (2)(DMF=N,N-二甲基甲酰胺),并对其结构与磁性质进行了系统的研究。单晶结构分析表明配合物1中的每个中心Gd(Ⅲ)离子均为8配位,其配位几何构型为略微变形的三角十二面体,相邻的中心Gd(Ⅲ)离子通过2个μ2-O连接形成了平行四边形的Gd2O2核心;配合物2中的每个中心Gd(Ⅲ)离子均为9配位,其配位几何构型为扭曲的球形单帽四方反棱柱,相邻的中心Gd(Ⅲ)离子通过3个μ2-O连接形成了三角双锥形的Gd2O3核心。磁性测试表明配合物1和2具有磁制冷性质,其最大磁熵变(-ΔSm)分别为20.16 J·K-1·kg-1(T=2.0 K,ΔH=70 kOe)和17.14 J·K-1·kg-1(T=2.0 K,ΔH=70 kOe)。 相似文献
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