An Alternating-Current Voltage Modulated Thermal Probe Technique for Local Seebeck Coefficient Characterization

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.     

三点弯曲法确定混凝土的双线性拉伸软化本构方程

本文提出了用带切口梁的三点弯曲试验确定混凝上拉伸软化本构方程的方法。     

对“关于静不定结构求位移的证明”一文的讨论

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...     

TWO REMARKS ON SCHWARZ FORMULA

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.     

Operation Mechanism of Double-Walled Carbon Nanotubes Transistors Investigated By ab initio Calculations

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.     

FINITE ELEMENT APPROXIMATION OF AN INTEGRO-DIFFERENTIAL OPERATOR

This paper deals with the finite element approximation of an integro-differential equation related with Riemann zeta-function.     

ON MNTS FORMULA

In the theory of Riemann Zeta-function,there is an important formula called Mnts formula.In this note we will give its general form.     

ON THE INTERIOR REGULARITIES OF THE SOLUTIONS OF QUASI-LINEAR ELLIPTIC EQUATIONS

In we discussed the problems of calculus of variations with strong nonlinearity. Its Euler equation is evidently the following elliptic type equation of divergent form with strongly increasing coefficients,We get the interior regularities of the solutions of(1). It is just the Hilbert's 19th problem in the case with strong nonlinearity.     

国家自然科学基金委化学科学部分析化学学科发展战略研讨会简介

国家自然科学基金委员会化学科学部于 2 0 0 2年 11月 2 4～ 2 6日在北京昌平召开了“分析化学学科战略发展研讨会”。来自全国各地的 4 2名分析化学学者参加了会议 ,其中院士 10人、杰出青年 17人、特邀代表 15人。国家科技部基础司司长张先恩教授也应邀出席了本次会议。基金委化学部副主任梁文平研究员首先作了“实施源头创新战略 ,树立化学学科新形象”的报告。认为分析化学是2 1世纪生命科学和纳米科学发展的关键 ;强调要重新树立化学的新形象 ,核心还是提倡创新性和创造性。基金委要在培养创新文化、营造学术文明中发挥作用 ,倡导良好…