聚乙炔中双激子和两个单激子的稳态性质

在Su-Schrieffer-Heeger (SSH)模型基础上,计入长程电子关联的影响,研究聚乙炔分子链中双激子态与2个单激子态的稳态性质,比较不同关联强度下激子的晶格位形、能级、电荷密度波、自旋密度波以及吸收谱线.结果表明:零电子关联下分子链中的2个单激子不能稳定存在；激子半径均随着关联强度的增加而减小；与双激子的...     

高校收费偏高的现状及对策研究

近年来，高校大规模扩招所引发的问题受到广泛关注。偏高的大学学费引起了包括教育公平在内的一系列教育问题。在澄清高校学生培养成本的基础上，根据前人的研究厘清了构成学费的合理成分，就目前我国高校收费偏高的现状做了探讨，并分别从学费偏高的表现、形成原因、影响和解决办法作一尝试性的分析。     

Charge Transfer and Bonding Strength in Lithium-intercalated Polyaromatic Hydrocarbons Studied by Photoelectron Spectroscopy

1 Results The potential applications of small-, medium-and large-size polyaromatic hydrocarbons for charge and energy storage in lithium metal and lithium ion batteries are discussed. In order to find the best carbon-based electrode materials, the specific roles of the molecular and solid-state contributions have to be understood. For the molecular contributions, a semi-quantitative method is proposed to compare the charge storage capability of polyaromatic hydrocarbon molecules. A compilation of result...     

Study the ethanol SI/HCCI combustion mode transition by using the fast thermal management system

In this paper the ethanol homogeneous charge compression ignition (HCCI) is achieved in a modified single cylinder engine by means of a self-developed fast thermal management system (FTMS), and the ethanol SI/HCCI operation regions are defined. It can be concluded that the thermal efficiency is higher and the NOx emission is lower in the HCCI operation region. In addition, the maximum NOx emission drops by 98%. The ethanol SI/HCCI combustion mode transition is conducted in different conditions near the SI/HCCI operation boundaries. It is likely to realize the transition by the utilization of FTMS. However, it is impossible to complete the transition within one operating cycle under current operation conditions. There are fluctuations in engine speed and brake mean effective pressure during the transition process. In order to reduce the fluctuations during the transition, the initial work concerning the effects of the spark ignition on the transition smoothness is carried out and the investigation indicates that the engine speed and brake mean effective pressure fluctuations cannot be eradicated only through spark ignition. Therefore, the control strategies combined with other factors should be further optimized.     

超导“邻近效应”与电子能态分布研究

运用稳恒条件和动量守恒定律说明了稳恒电路中,穿过任意横截面的全部载流子的定向运动总动量在数值上是守恒的;比较了超导薄膜中和正常导体的外表面层中载流子的能态,用以上的两个结果解释了超导“邻近效应”.     

相对论效应下的电荷相互作用

电磁场是一个统一的整体，通过惯性参考变换，利用洛仑兹变换所确立的作用力变换规律，讨论了当电荷作均速直线运动时，电荷间相互作用力的问题。     

运动电荷的电场与磁场

本文论证了低速运动点电荷产生磁场等价于该运动电荷的变化电场所产生的磁场，并进一步计算了高速运动点电荷激发的电场与磁场。     

再评霍耳效应的物理模型

本从理论上证明了在动态平衡条件下霍耳片内电流线具有Y轴方向分量不会导致霍耳电荷的无限堆积。     

卤族桥接混合价化合物中的非线性晶格弛豫(英文)

对卤族桥接含金属离子的混合价化合物(HMMC)的研究,近年来引起人们广泛的兴趣,因为这种物质具有准一维电荷密度波基态,能生长成良好的单晶,是研究低维量子理论的一种良好的样品,具有很大潜在的应用前景.本文根据作者所发展的处理电子-声子作用的方法;提出了一个HMMC被光激发后的晶格驰豫模型,讨论了其对光感应吸收的影响,并在此基础上,计算了光感应吸收峰,较之其他模型所算得的结果更符合实验事实。     

井巷光面爆破施工工艺

光面爆破技术已广泛应用于井巷施工中，由于其具有炮眼数目多、爆破参数和周边眼装药量及装药结构要求严格等特殊性，因此，必须通过采用科学的布孔定位和钻眼方法，优化爆破参数等措施来提高光面爆破施工质量。