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对“关于静不定结构求位移的证明”一文的讨论陈家骏,吴锁珠(常州建筑职工大学,常州213015)文[1]通过举例证明求静不定结构位移时,所采用的虚拟力状态可取为广义单位力加在原结构的任一相当系统上,文[2]对此从数学上给出了一般性的证明;即广义位移(为... 相似文献
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An Alternating-Current Voltage Modulated Thermal Probe Technique for Local Seebeck Coefficient Characterization 下载免费PDF全文
Nanostructured and nanocomposite thermoelec- tric materials have recently attracted a great deal of attention due to the optimization of thermal and electrical transports for high thermoelectric performance The initial ideas for the applica- tions of nano-structures in thermoelectric materials are that the lattice thermal conductivity can be de- pressed by the scattering of nano-particles or nano- boundaries as well as the enhanced electron density of states at the Fermi level. The latter is expected to enhance Seebeck coefficients due to the fact that the low energy carriers can be filtered by nano-sized grain boundaries. Lowered thermal conductivity and enhanced thermoelectric figure of merit have been ob- served in lots of bulk materials with nanostructures or nano-impurities. However, the thermal and electrical transports in these nano-materials are usually mea- sured by normal commercial systems, in which only the statistical values of the transports are obtained. The characterization of local thermoelectric parame- ters still remains a challenging task at the submicro, even nanometer level as a powerful tool for Scanning probe microscopy nanostructure imaging and local properties characterization, has become a promis- ing technique for measuring local thermal and electri- cal properties, like scanning tunneling microscopy, scanning thermal microscopy, and scanning Joule expansion microscopy. Recent work has demon- strated simultaneously determined the thermal con- ductivity and Seebeek coefficient of Bi2Se3 thin film by a microprobe technique. 相似文献
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This paper discusses two problems. Firstly the authors give the Schwarz formula for a holomorphic function in unit disc when the boundary value of its real part is in the class H of generalized functions in the sense of Hua. Secondly the authors use the classical Schwarz formula to give a new proof of the zero free region of the Riemann zeta-function. 相似文献
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Operation Mechanism of Double-Walled Carbon Nanotubes Transistors Investigated By ab initio Calculations 下载免费PDF全文
Recently, a new switching characteristic of double-walled carbon nanotubes (DWNTs) transistors is found in during experiments. We carry out a series of ab intio calculations on DWNTs' electronic properities, together with verification on the electronic response under the electric field. Our results reveal that the peculiar energy states relation in DWNTs and related contact modes should account for the distinct switching behavior of DWNT transistors. We believe these results have important implications in the fabrication and understanding of electronic devices with DWNTs. 相似文献
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This paper deals with the finite element approximation of an integro-differential equation related with Riemann zeta-function. 相似文献
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In the theory of Riemann Zeta-function,there is an important formula called Mnts formula.In this note we will give its general form. 相似文献