热学

正出版社:科学出版社简介:本书是编者基于多年的"热学"课程教学实践经验编撰而成。本书从高等教育人才培养的总体要求出发,以培养高等院校学生的专业素质和能力为目标,基于国内教材讲授的传统内容,汲取美国与欧洲教材新颖灵活、切合实际等优点,对内     

Structural,electronic,and magnetic properties of transition-metal atom adsorbed two-dimensional GaAs nanosheet

By using first-principles calculations within the framework of density functional theory,the electronic and magnetic properties of 3d transitional metal(TM) atoms(from Sc to Zn) adsorbed monolayer Ga As nanosheets(Ga As NSs) are systematically investigated.Upon TM atom adsorption,Ga As NS,which is a nonmagnetic semiconductor,can be tuned into a magnetic semiconductor(Sc,V,and Fe adsorption),a half-metal(Mn adsorption),or a metal(Co and Cu adsorption).Our calculations show that the strong p–d hybridization between the 3d orbit of TM atoms and the 4p orbit of neighboring As atoms is responsible for the formation of chemical bonds and the origin of magnetism in the Ga As NSs with Sc,V,and Fe adsorption.However,the Mn 3d orbit with more unpaired electrons hybridizes not only with the As 4p orbit but also with the Ga 4p orbit,resulting in a stronger exchange interaction.Our results may be useful for electronic and magnetic applications of Ga As NS-based materials.     

军事威逼博弈分析

本文通过构造一种三阶段动态博弈模型,对军事威逼行为进行了形式化分析,得出了在完全信息条件下军事威逼现象不会出现的结论;基于对挑战者与威慑者双边不完全信息条件下军事威逼模型博弈均衡的求解,探讨了军事威逼成功应满足的条件。     

一种晶体表面水平纳米线生长机理的蒙特卡罗模拟研究

采用动力学蒙特卡罗方法模拟,发现在较低过饱和度流体中对称性破缺的简单立方晶体光滑（001）表面上基于晶核的水平纳米线的生长机理．在此基础上,进一步研究了各向异性的表面上经向和纬向热粗糙度对纳米线形貌的影响,分析了纳米线的生长随时间的变化,并系统讨论了纳米线生长速率与表面经向和纬向热粗糙度、过饱和度、晶面尺寸以及表面扩散作用的依赖关系．     

军事威慑博弈中挑战者行为预测模型比较

将基于完全理性的期望效用理论与基于有限理性的前景理论的两种决策模型应用于军事威慑两阶段博弈分析之中.研究结果表明,前景理论模型与期望效用理论模型对挑战者行为的预测结果具有显著的差异.     

基于进化博弈方法的相互威慑稳定性分析

在危机管理和冲突分析中,力量对等冲突方之间的相互威慑是否具有稳定性问题,一直存在疑义。本文基于进化博弈论视野,给出了直接求解3×3和4×4鹰—鸽博弈扩展模型进化稳定策略ESS(EvolutionaryStableStrategy)的方法,画出了3×3鹰—鸽扩展博弈的相位图,得出了威慑策略是进化稳定策略的结论,从而对上述问题进行了有说服力的解释。     

Engineering of electronic and optical properties of ZnO thin films via Cu doping

ZnO thin films doped with different Cu concentrations are fabricated by reactive magnetron sputtering technique. XRD analysis indicates that the crystal quality of the ZnO:Cu film can be enhanced by a moderate level of Cu-doping in the sputtering process. The results of XPS spectra of zinc, oxygen, and copper elements show that Cu-doping has an evident and complicated effect on the chemical state of oxygen, but little effect on those of zinc and copper. Interestingly, further investigation of the optical properties of ZnO:Cu samples shows that the transmittance spectra exhibit both red shift and blue shift with the increase of Cu doping, in contrast to the simple monotonic behavior of the Burstein–Moss effect. Analysis reveals that this is due to the competition between oxygen vacancies and intrinsic and surface states of oxygen in the sample. Our result may suggest an effective way of tuning the bandgap of ZnO samples.     

Uniaxial strain-dependent magnetic and electronic properties of (Ga,Mn)As nanowires

Variations in magnetic and electronic properties as a function of uniaxial strain in wurtzite(Ga,Mn)As nanowires(NWs) grown along the [0001] direction were investigated based on density functional theory(DFT). We found that(Ga,Mn)As NWs are half-metal, and the ferromagnetic state is their stable ground state. The magnetism of the NWs is significantly affected by the strain and by the substituent position of Mn impurities. By examining charge densities near the Fermi level, we found that strain can regulate the conductive region of the NWs. More interestingly, the size of spin-down band gap of the NWs is tunable by adjusting uniaxial stress, and the NWs can be converted from indirect to direct band gap under tension.     

一种不完全信息相互威慑讨价还价模型

理性威慑理论将相互威慑看作是一种讨价还价过程，但鲁宾斯坦经典讨价还价模型无法直接用于相互威慑讨价还价研究。本文将不完全信息引入相互威慑讨价还价之中，探讨了相互威慑中博弈方单边不完全信息和双边不完全信息条件下的威慑可信性与冲突可能性。     

基于云模型的地下商城火灾防范能力评估

将逆向云发生器与一维前件云发生器综合集成,比对待评估地下商城与地下工程"火灾防范能力数据库"各项指标之间的确定度,并利用Matlab云发生器工具箱对各个等级的确定度进行大量随机计算,通过比较各个等级的中值与均值,判断待评估地下商城的火灾防范能力等级.结论表明,综合云发生器不仅可以客观全面的保留原始评价信息,而且评价结果更加立体直观.