外加电场下谐振子量子线的电子拉曼散射

文章研究了外加电场下谐振子量子线的电子拉曼散射.利用有效质量近似,以GaAs材料为例,计算了微分散射截面,结果表明,谐振子频率和外加电场的强度对拉曼光谱均有影响.拉曼光谱的峰值随着外加电场强度的增大而增大;在恒定的外加电场下,与电场方向相同的谐振子频率只影响峰值的大小,而与电场方向垂直方向的谐振子频率还对峰值的位置有影...     

具有DM相互作用的各向异性XY模型的保真度

采用保真度和保真率的方法研究了具有Dzyaloshinskii-Moriya(DM)相互作用的各向异性XY模型的量子相变.数值研究了保真度和保真率在量子相变点附近的行为,结果表明采用保真度和保真率方法研究该模型的量子相变切实可行.     

Quantum programming: From theories to implementations

This paper surveys the new field of programming methodology and techniques for future quantum computers, including design of sequential and concurrent quantum programming languages, their semantics and implementations. Several verification methods for quantum programs and communication protocols are also reviewed. The potential applications of programming techniques and related formal methods in quantum engineering are pointed out.     

采用分支理论对急冷过程中多定态现象的研究

通过一个简单模型模拟了合金Pd82Si18的急冷过程,分析实验上难以测定的热传输指数对凝固过程中相关参数的影响.结果显示,当冷模温度足够慢地从900K下降到300K时,对应2.0×105～5.0×105W/(m2K)范围内的热传输指数,多定态现象发生.当多定态发生,冷模温度达到一个临界值时,固液界面上会产生剧烈的温度下降.随着该温度的突然下降,在液固界面上很可能会发生玻璃转变.     

Localization and the interface between quantum mechanics, quantum field theory and quantum gravity II: The search of the interface between QFT and QG

The main topics of this second part of a two-part essay are some consequences of the phenomenon of vacuum polarization as the most important physical manifestation of modular localization. Besides philosophically unexpected consequences, it has led to a new constructive “outside-inwards approach” in which the pointlike fields and the compactly localized operator algebras which they generate only appear from intersecting much simpler algebras localized in noncompact wedge regions whose generators have extremely mild almost free field behavior.Another consequence of vacuum polarization presented in this essay is the localization entropy near a causal horizon which follows a logarithmically modified area law in which a dimensionless area (the area divided by the square of dR where dR is the thickness of a light-sheet) appears. There are arguments that this logarithmically modified area law corresponds to the volume law of the standard heat bath thermal behavior. We also explain the symmetry enhancing effect of holographic projections onto the causal horizon of a region and show that the resulting infinite dimensional symmetry groups contain the Bondi–Metzner–Sachs group. This essay is the second part of a partitioned longer paper.     

自旋相干态法解Dicke模型的基态解析解

文章采用了自旋相干态的三种表达方式,利用了变分原理,求解了Dicke模型的相变点和基态能量解析表达式,这三种方法所得的结论与Holstein-Primakoff(HP)变换方法所得结论完全一致,而这三种方法有一定的普适性和优越性.     

护士心理压力的现状及对策研究

护理工作责任重，面临的冲突较多，造成了护士心里压力过大，如果没有一个良好的心里状态，很难适应现代医学的需要，因此护士要善于进行自我心态的调整，使压力得以缓解共建和谐友好的工作氛围。     

基于单粒子的量子投票方案

提出了一个量子投票方案。投票者利用局域幺正操作进行投票，计票员可根据测量的结果计算出投票的结果。通过对方案的正确性和秘密性进行分析，表明该方案是安全的。而且，与采用Ⅳ维量子纠缠态的量子投票方案相比，该方案只涉及二维量子态，测量较为简单，这在现有的技术条件下是更易于实现的。     

在体育课中如何创设好的情感环境和培养学生的自信心

体育有别于其他学科的显著特点是直观性相当强，师生共同活动，教与练的密切配合贯穿于整个课堂。体育课中有一个好的情感环境，就能使学生的注意力集中，有兴趣，精神振奋，这对提高课的质量，显得十分重要。自信心就像催化荆能将人的一切潜能调动起来，使人们百折不挠，不断努力，最终获得成功。     

压力下半导体GaAs的电子表面态

使用插值拟合近似获得晶格常数、带隙随压力的解析表示，采用变分法研究了流体静力学压力对半导体GaAs电子本征表面态的影响，数值结果表明，随压力增加电子表面态能级明显向上移动，且电子趋近表面。