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81.
82.
等强度悬臂梁作为力学传感器的关键转换元件,不同尺寸和材料的悬臂梁,其自由端的挠度和作用力的量程及光纤光栅的最大微应变也不同。采用光学测量中的基本元件光纤光栅及等强度悬臂梁为模型基础,设计模型平面节点坐标有六个,平面节点坐标可以改变等强度悬臂梁的尺寸,模型厚度依次设置为0.005m、0.010m、0.015m、0.020m、0.030m。对初始尺寸,厚度为0.005m,材料选择为碳素钢的悬臂梁的仿真,结果表明,光纤光栅工作在均匀应变区时,其自由端挠度的量程为0~2.767×10-2 m,作用力的量程为0~437N,光纤光栅的最大微应变为171με。 相似文献
83.
We report on stacking fault (SF) detection in free-standing cubic-SiC epilayer by the Raman measurements. The epilayer with enhanced SFs is heteroepitaxially grown by low pressure chemical vapour deposition on a Si(100) substrate and is released in KOH solution by micromechanical manufacture, on which the Raman measurements are performed in a back scattering geometry. The TO line of the Raman spectra is considerably broadened and distorted. We discuss the influence of SFs on the intensity profiles of TO mode by comparing our experimental data with the simulated results based on the Raman bond polarizability (BP) model in the framework of linearchain concept. Cood agreement with respect to the linewidth and disorder-induced peak shift is found by assuming the mean distance of the SFs to be 11 A in the BP model. 相似文献
84.
A new analysis method is presented for the study of Fukui-Ishibashi deterministic one-dimensional traffic flow cellular automaton model of high speed car on highway. By using this method, the exact mean field equation describing the fundamental diagram curve of average traffic speed versus the car density on highway can be derived strictly. 相似文献
85.
86.
引入改进的F-广义方法,并将其应用于(2+1)维Nizhnik-Novikov-Veselov(NNV)方程.在符号计算软件的帮助下,可以得到NNV方程的许多新解.该方法用于获取包括雅可比椭圆函数解的一系列解,在数学物理中可应用于其他的非线性偏微分方程. 相似文献
87.
Facile fabrication of highly flexible,porous PEDOT: PSS/SWCNTs films for thermoelectric applications
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High-performance organic composite thermoelectric(TE)materials are considered as a promising alternative for harvesting heat energy.Herein,composite films of poly(3,4-ethyienedioxythiophene):poly(styrene sulfonate)/single-walled carbon nanotubes(PEDOT:PSS/SWCNTs)were fabricated by utilizing a convenient solution mixing method.Thereafter,the as-prepared hybrid films were treated using sulfuric acid(H2SO4)to further optimize the TE performance.Film morphological studies revealed that the sulfuric acid treated PEDOT:PSS/SWCNTs composite samples all possessed porous structures.Due to the successful fabrication of highly conductive networks,the porous nano-architecture also exhibited much more excellent TE properties when compared with the dense structure of the pristine samples.For the post-treated sample,a high power factor of 156.43μW·m-1·K-2can be achieved by adjusting the content of CNTs,which is approximately 3 orders of magnitude higher than that of the corresponding untreated samples(0.23μW·m-1·K-2).Besides,the obtained films also showed excellent mechanical flexibility,owing to the porous nanostructure and the strong p–p interactions between the two components.This work indicates that the H2SO4 treatment could be a promising strategy for fabricating highly-flexible and porous PEDOT:PSS/SWCNTs films with high TE performances. 相似文献
88.
Surface saturation control on the formation of wurtzite polytypes in zinc blende SiC nanofilms grown on Si-(100) substrates
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We investigate the formations of wurtzite (WZ) SiC nano polytypes in zinc blende (ZB) SiC nanofilms hetero-grown on Si-(100) substrates via low pressure chemical vapor deposition (LPCVD) by adjusting the Si/C ratio of the introduced precursors. Through SEM, TEM, and Raman characterizations, we find that the nanofilms consist of discrete WZ SiC nano polytypes and ZB SiC polytypes composed of WZ polytypes (WZ + ZB) and disordered ZB SiC polytypes, respectively, according to Si/C ratios of 0.5, 1.5, and 3. We attribute the WZ polytype formation to being due to a kinetic mechanism based on the Si/C surface saturation control. 相似文献
89.
90.
高速运动的航空器在其飞行过程中会经历复杂的空间环境,使其静电安全性遭受严峻挑战。针对某型航空隔热瓦硅基复合材料讨论分析了多种防静电性能的评估方法,确定了静电衰减时间作为其防静电性能指标,并采用充电法对静电衰减时间进行了测试研究,获得了该材料在烧蚀前后的静电衰减特性,为评价高速飞行器的静电安全性提供了重要依据。研究结果表明,烧蚀前的硅基复合材料静电衰减时间长,残余电量大;烧蚀后的硅基复合材料静电衰减时间大大减小、残余电量显著降低,防静电性能远好于烧蚀前的硅基复合材料。 相似文献