高能物理与核物理第11卷1987年总目录

第1期10‘’。v附近初级宇宙线能谱指数的测量··...····,········……徐克尊、张振华、唐子洲、王明谦(1)塑料流光管感应读出的某些特性…王孝良、陈元柏、林建峰、张家栓、徐雨林、徐蓉芬、谢一冈(6)永磁四极透镜在加速器束流输运与聚焦中的应用············································,···…… ,·····,···············,··········……袁勤良、王友智、石才土、陈冠雄、张椒香、陈仁怀、刘茂三(11)3 x3锗酸韧晶体阵列探测器对于0.5一Z…     

工程热物理学报1985年总目录

工程热力学与动力装置 卡诺热机的最佳效率与功率间的关系热力学偏导数在火箭发动机性能计算中的应用··……,’’二,’’,,’:二,’一个改进的饱和液体状态方程··················,···········……童景山炭黑工业余热利用的最优化研究··················,········……刘国墉变质量系统过程方程及有漏气压缩过程的热力学分析……吴沛宜实际工质拥烩图的应用与修正······················...……,’’二朱明善混合工质制冷系统节能的热力学分析······…     

全国第二届工程热物理学术会议宣读论文目录

工程热力学与动力装置“沦热工问题的拥效率分析”等···················································……,’’…杨东华匕上海化工学院)液N:预冷的克劳得He液化循环的佣分析···············································……(西安交通大学),采用F一502时压缩机的性能试验研究···················……,’’····……南京冷气机械厂,西安交通大学)柴油机热力计算的数值方法·············…     

工程热物理学报1984年分类目录

工程热力学与动力装置期(页) 火箭发动机热力计算中修正温度和压力的牛顿迭代公式·········……方丁酉1(1) 联合循环蒸汽回路对经济性影响的研究·················……‘······……王顺昌1(8) 动力系统空冷冷凝器的佣损失分析以及优化设计的评价指标·······……,… ·······································……王维城朱明善刘颖岳光溪l(11) 太阳能动力系统的热力学分析和优化问题···……倪振伟顾传保罗棣奄1(14) 压力对燃气热力性质影响的余函数线性修…     

《核聚变与等离子体物理》1987年第7卷总目录

第1期一种聚变反应堆装置的新概念··········1········……蔡诗东沈解伍陈雁萍徐民健陈允明宋院旭金山康向东金山郭世宠俞雪华汪诗金康向东王乃彦宋院旭王乃彦李有宜荣福瑞刘万东柯孚久周玉美张淳元强流相对论性电子束在低压中性气体中传输的研究一王效军王淦昌强流相对论性电子束在真空漂移管中的传输·················……王效军HL一1装置长脉冲放电的初步分析KT一5托卡马克装置及其初步实验王淦昌(16)苏远(20)……闻一之万树德 韩申生离子束一等离子体系统的电磁不稳定性··,··……场反向位形中…     

实验测定183Os的QEC值

用39MeV-α粒子轰击天然钨靶产生了¹⁸³Os测量了¹⁸³Os衰变的γ-β符合谱,确定了β⁺能谱的端点能量.最终提取出 衰变的QQ_EC值:Q_EC=2.24±0.10MeV,与系统学的估计值;2.30±0.10MeV在误差范围内相符.     

第7卷光谱学与光谱分析总目录

第7卷第1期1957年2月BeA12O4:Cr3+系统中ZE~夺A:跃迁谱线随压力的变化 ..·“·“.”·“·“·“·”·..·”·”·“一刘竟青唐沃明王彦云贾帷义商玉生何寿安(l)激光饱和吸收法研究碰撞速率过程·········“·····”·“············一‘“·“·”·”一‘一黄元网(5)吸附在滤纸上的荧光样品量子效率侧量“·”·“·”·“·”·“一…何永安宋胭王银屏(9)发光光谱在多环芳烃分析中的进展一‘···“·”·”·······一~王连生周爱和江善根(12)用格林函数讨论高分子中杂质的红外吸收···“···…     

《燃烧学》学术会议宣读论文目录

燃烧室涡流器流量系数与阻力系数的试验分析······························……煤粉燃烧放热及介质辐射特性参数的数值分析·····················……李村生涡扇六发动机高压燃烧试验研究···································……’··……‘二“直接喷射式柴油机燃烧放热率及燃烧放热效率的研究·········,···········…… .············································………     

《应用声学》1986年 总目录

页数期数 者 作题目综述与评论声学悬浮技术及其应用··…····……几种人工混响装置的特性分析……风机气动力噪声与气动力设计问题现代生物医学超声工程学·····……研究报告声光相关器在雷达信号处理中的应用·························“··········································……徐介平俞宽新纵振合成超声振动系统的研究····················································……”·····…     

中国工程热物理学会第四届年会宣读论文目录

工程热力学与能源利用 用相似理论对单轴燃气轮机起动工况的分析···……倪伟斗(清华大学)李世敏(北京第三热电厂) 燃气涡轮发动机性能计算程序的若干改进····································……王乃行(西北工业大学) 分轴燃气轮机的变工况计算与性能分析································‘············……赵士杭(清华大学) 从有限热源获得最大功率输出时的循环效率······································…     

Trapped Fermi gases in rotating optical lattices: realization and detection of the topological hofstadter insulator

We consider a gas of noninteracting spinless fermions in a rotating optical lattice and calculate the density profile of the gas in an external confinement potential. The density profile exhibits distinct plateaus, which correspond to gaps in the single particle spectrum known as the Hofstadter butterfly. The plateaus result from insulating behavior whenever the Fermi energy lies within a gap. We discuss the necessary conditions to realize the Hofstadter insulator in a cold atom setup and show how the quantized Hall conductance can be measured from density profiles using the Streda formula.     

Spectral Properties of Graphene with Periodic Array of Defects in a Magnetic Field

Graphene with a periodic array of defects in a homogeneous magnetic field is considered. We suggest a solvable model of the system. Three types of defects are studied. The spectra of the Hamiltonians have the Hofstadter butterfly type. The comparison of the spectrum for pure graphene and one for the system having defects of each type is made.     

A tale of two fractals: The Hofstadter butterfly and the integral Apollonian gaskets

This paper unveils a mapping between a quantum fractal that describes a physical phenomena, and an abstract geometrical fractal. The quantum fractal is the Hofstadter butterfly discovered in 1976 in an iconic condensed matter problem of electrons moving in a two-dimensional lattice in a transverse magnetic field. The geometric fractal is the integer Apollonian gasket characterized in terms of a 300 BC problem of mutually tangent circles. Both of these fractals are made up of integers. In the Hofstadter butterfly, these integers encode the topological quantum numbers of quantum Hall conductivity. In the Apollonian gaskets an infinite number of mutually tangent circles are nested inside each other, where each circle has integer curvature. The mapping between these two fractals reveals a hidden D ₃ symmetry embedded in the kaleidoscopic images that describe the asymptotic scaling properties of the butterfly. This paper also serves as a mini review of these fractals, emphasizing their hierarchical aspects in terms of Farey fractions.     

Effects of disorder on modulated quantum Hall systems

The Hall conductivity and the localization length are calculated for weakly modulated two-dimensional systems within the lowest Landau level approximation. We find that the fractal character of the Hofstadter butterfly is reflected on the coincidence in the localization and the Hall conductivity among a series of fluxes φ+2n with integers n.     

Hofstadter＇s Butterfly and Phase Transition of Checkerboard Superconducting Network in a Magnetic Field

We study the magnetic effect of the checkerboard superconducting wire network. Based on the de Gennes- Alexader theory, we obtain difference equations for superconducting order parameter in the wire network. Through solving these difference equations, we obtain the eigenvalues, linked to the coherence length, as a function of magnetic field. The diagram of eigenvalues shows a fractal structure, being so-called Hofstadter＇s butterfly. We also calculate and discuss the dependence of the transition temperature of the checkerboard superconducting wire network on the applied magnetic field, which is related to up-edge of the Hofstadter＇s butterfly spectrum.     

Cold atoms in non-Abelian gauge potentials: from the Hofstadter "moth" to lattice gauge theory

We demonstrate how to create artificial external non-Abelian gauge potentials acting on cold atoms in optical lattices. The method employs atoms with k internal states, and laser assisted state sensitive tunneling, described by unitary k x k matrices. The single-particle dynamics in the case of intense U2 vector potentials lead to a generalized Hofstadter butterfly spectrum which shows a complex mothlike structure. We discuss the possibility to realize non-Abelian interferometry (Aharonov-Bohm effect) and to study many-body dynamics of ultracold matter in external lattice gauge fields.     

Effects of the Rashba spin-orbit coupling on Hofstadter's butterfly

We study the effect of Rashba spin-orbit coupling on the Hofstadter spectrum of a two-dimensional tight-binding electron system in a perpendicular magnetic field. We obtain the generalized coupled Harper spin-dependent equations which include the Rashba spin-orbit interaction and solve for the energy spectrum and spin polarization. We investigate the effect of spin-orbit coupling on the fractal energy spectrum and the spin polarization for some characteristic states as a function of the magnetic flux α and the spin-orbit coupling parameter. We characterize the complexity of the fractal geometry of the spin-dependent Hofstadter butterfly with the correlation dimension and show that it grows quadratically with the amplitude of the spin-orbit coupling. We study some ground state properties and the spin polarization shows a fractal-like behavior as a function of α, which is demonstrated with the exponent close to unity of the decaying power spectrum of the spin polarization. Some degree of spin localization or distribution around +1 or -1, for small spin-orbit coupling, is found with the determination of the entropy function as a function of the spin-orbit coupling. The excited states show a more extended (uniform) distribution of spin states.     

The integer quantum Hall effect of a square lattice with an array of point defects

The electronic properties of a square lattice under an applied perpendicular magnetic field in the presence of impurities or vacancies are investigated by the tight-binding method including up to second nearest neighbor interactions. These imperfections result in new gaps and bands in the Hofstadter butterfly even when the second order interactions break the bipartite symmetry. In addition, the whole spectrum of the Hall conduction is obtained by the Kubo formula for the corresponding cases. The results are in accordance with the Thouless-Kohmoto-Nightingale-den Nijs integers when the Fermi energy lies in an energy gap. We find that the states due to the vacancies or impurities with small hopping constants are highly localized and do not contribute to the Hall conduction. However, the impurities with high hopping constants result in new Hall plateaus with constant conduction of σ(xy)?=±?e(2)/h, since high hopping constants increase the probability of an electron contributing to the conduction.     

The Landau Problem on the θ-Deformed Two-Torus

We study the Landau problem on the -deformed two-torus and use well-known projective modules to obtain perturbed energy spectra. For a strong magnetic field B, the problem can be restricted to one particular Landau level. First we represent generators of the algebra of the noncommutative torus T ² as finite-dimensional matrices. A second approach leads to a reducible representation with a -dependent center. For a simple periodic potential, the rational part of the Hofstadter butterfly spectrum is obtained.