Mössbauer study on a two-dimensional triangular antiferromagnet YFeMnO4

Magnetic ordering of YFeMnO₄ has been studied with Mössbauer spectroscopy in the temperature range between 4.2 K and 300 K on the conditions of gamma rays parallel to and perpendicular to thec-axis. It is revealed that the spin system orders like a Heisenberg spin system in a triangular antiferromagnet with an anisotropic axis parallel to thec-axis.     

Detection of a correlation between the orientation and the magnitude of the hyperfine field of57Fe in YFeMnO4

Overlapping Mössbauer spectra of a single crystal of YFeMnO₄ are analyzed using the Hesse method extended to determine the distribution of two magnetic parameters: the orientation and the magnitude of the hyperfine field. A nearly linear correlation between them is detected with γ-rays incident parallel to thec-axis. A misfit of the spectrum around the central two lines may be attributed to a dynamical effect of the spins.     

Dynamical effects in superfluid helium 4

The close structural similarity between the commutation relations of harmonic oscillator operators and the operators for Bose fields is exploited to study the excitation spectrum in superfluid helium 4. By applying ‘broken symmetry’ condition it is shown how the creation of phonon gives rise to superfluid behaviour of liquid He 4. The energy gap needed for roton excitation is derived.     

5D geometrical property and 4D property of matter

It is shown that physical quantities in the 4D world such as density and pressure, and an equation of state for a gravitating spherically symmetric fluid, are given by the geometrical property of the fifth dimension of a spherically symmetric line-element in Wesson's 5D theory of gravity.     

Dynamical structure of linearizedGL(4) gravities

The physical content of the three more natural models ofGL(4) gravity is analyzed, for the case of weak fields. The first model we deal with is the linearized version of Yang's onetensor-field gravity. It is shown that this is a scalar-tensor theory, with its scalar part contained in the symmetric tensorh , instead of appearing explicitly, externally to the symmetric tensorh , as happens in Brans-Dicke type of scalar-tensor theories. The second and the third linearized models, which can both be derived from the fourth-order action postulated by Yang, turn out to be two-tensor decoupled systems. In both cases one of the tensors is the symmetric weak metric gravity tensor field. The second tensor appearing in these two models, representing theGL(4)-gauge field, is either a linearized symmetric affinity (in the second model) or a linearized but nonsymmetric affinity (for the third model). It is shown that in these last two cases the affinity contains a helicity-3 propagating field. The connection is also given between the fourth-order system which determines the dynamical structure (for the last two models) of the metric tensor and the third-order Yang model of gravity. Owing to the presence of helicity-3 fields we show that it is better to regard Yang's action as an action for a two-tensor system instead of trying to recover from it a pure gravity (one-tensor-field) action. Finally, it is shown what is the dynamical structure of the second and third linearized two-tensor models which can be derived from Yang's action.On leave of absence from the Universidad Simón Bolívar.     

黏弹性材料的动态力学特性及其对覆盖层吸声性能的影响

本文利用标准化动态力学测量手段获得了某种高分子聚合物的动态杨氏模量,并根据时温等效原理对动态杨氏模量与声学测量在频段上的差异加以分析和转换,得到了500—7500 Hz频率范围内该黏弹性材料杨氏模量随频率变化的特性.基于所测得动态杨氏模量,采用有限元方法分析了均匀黏弹材料的吸声性能,并将仿真结果与样品声管实验数据进行对比,验证了测试所得参数的准确性.进一步仿真分析了含有局域共振结构的声学覆盖层吸声性能,并讨论了黏弹性材料的动态特性对其吸声性能的影响,提出了改进水声覆盖层低频宽带吸声特性的建议.     

Differential Representations of SO(4) Dynamical Group

In this paper we present systematic differential representations for the dynamical group SO(4). These representations include the left and the right differential representations and the left and the right adjoint differential representations in both the group parameter space and its coset spaces. They are the generalization of the differential representations of the SO(3) rotation group in the Euler angles. These representations may find their applications in the study of the physical systems with SO(4) dynamical symmetry.     

Dynamical properties of charged stripes in La2-xSrxCuO4

Inelastic light-scattering spectra of underdoped La2-xSrxCuO4 single crystals are presented which provide direct evidence of the formation of quasi-one-dimensional charged structures in the two-dimensional CuO2 planes. The stripes manifest themselves in a Drude-like peak at low energies and temperatures. The selection rules allow us to determine the orientation to be along the diagonals at x=0.02 and along the principal axes at x=0.10. The electron-lattice interaction determines the correlation length which turns out to be larger in compound classes with lower superconducting transition temperatures. Temperature is the only scale of the response at different doping levels demonstrating the importance of quantum critical behavior.     

4 MV激光触发多级多通道开关特性

 报道了4 MV激光触发多级多通道开关的结构设计和初步的实验结果及分析。该开关采用轴向聚焦触发方式，设计为匀场结构，采用场调整环与匀压环调整开关间隙电场分布，电极-绝缘子序列采用堆栈结构替代榫接结构，独立定位、紧固。实验结果表明：4 MV激光触发多级多通道开关的自击穿电压偏差小于5%，自击穿电压与工作气压呈良好的线性关系；触发延迟时间约25 ns，极差小于±2.5 ns，抖动1.5 ns；等工作电压-气压比条件下，随着气压和工作电压的上升触发延迟时间及其抖动趋向下降。     

Dynamical parameters and phonon spectrum of crystal In4Te3

Calculations of the phonon spectrum of an In₄Te₃ crystal in the central pair-interaction model neglecting long-range forces are reported. The model developed contains 19 unknown parameters, which were determined from experimental values of the displacements of individual sublattices in the unit cell and from the change in the basis vectors as a result of hydrostatic pressure. The phonon spectrum obtained contains a large number of low-frequency optical branches, deforming the acoustic branches. Fiz. Tverd. Tela (St. Petersburg) 41, 1843–1847 (October 1999)     

一类四维忆阻混沌电路的动力学行为分析

讨论一类4D忆阻混沌电路的动力学行为,并研究多稳定性的吸引域.为保证计算结果的高效性和准确性,利用CPU+GPU的大规模计算能力和具有128位小数的多精度GMP库及MPFR库,计算出对应吸引子的吸引域,并用区间牛顿法验证当吸引域很小时吸引子的存在性;最后运用拓扑马蹄理论和构造忆阻模拟电路两种方式验证系统超混沌的存在性.     

Dynamical properties of the one-dimensional band insulator (NbSe4)3I

Optical and photoemission experiments reveal unexpected spectral signatures of one-dimensional band insulators. In the model compound (NbSe (4))3I the optical conductivity decays as a power law sigma(1)(omega) approximately omega(-4.25) above a sharp gap edge. Photoemission observes both the valence and a shadow band, produced by a commensurate superstructure. We identify an optical and photoemission band gap consistent with other measurements but much smaller than the energy scale defined by the dispersion of the band peak in the photoemission spectra.     

Bianchi A Cosmological Models as the Simplest Dynamical Systems in R4

The behaviour of the vacuum non-tilted Bianchimodels of class A is studied in terms of dynamicalsystems theory. We introduce phase variables in whichthe Hamiltonian constraint is solved algebraically. It is shown that in these variables BianchiVIII and Bianchi IX models assume the form of afour-dimensional autonomous system with a polynomialvector field defined on the phase space, whereas Bianchi I and Bianchi II world models can be presentedas a one- and two-dimensional system, respectively. TheBianchi VI₀ and Bianchi VII₀ worldmodels are represented as a three-dimensional dynamicalsystem.     

Photoluminescent property of mechanically milled BaWO4 powder

Crystalline BaWO₄ (BWO) powder obtained by the polymeric precursor method was structurally disordered by means of high-energy mechanical milling. For the first time a strong and broad photoluminescence (PL) has been measured at room temperature for mechanically milled BWO powder and interpreted by ground-state quantum mechanical calculations in the density functional theory framework. Two periodic models have been studied; one representing the crystalline form and the other one representing the disordered BWO powder. These models allowed the calculation of electronic properties, which are consistent with the experimental results, showing that structural disorder in the lattice is an important condition to generate an intense and broad PL band.     

3-溴-4-丁氧基-4′-硝基偶氮苯三阶非线性光学性能的研究

采用Z扫描技术对一种新的偶氮苯类化合物的三阶非线性光学系数进行了测量。实验结果的分析表明,该化合物具有较大的三阶非线性极化率;其三阶非线性主要来源于强的π电子离域性。     

3-溴-4-丁氧基-4'-硝基偶氮苯三阶非线性光学性能的研究

采用Z扫描技术对一种新的偶氮苯类化合物的三阶非线性光学系数进行了测量.实验结果的分析表明,该化合物具有较大的三阶非线性极化率;其三阶非线性主要来源于强的π电子离域性.     

Dynamical Determinants via Dynamical Conjugacies for Postcritically Finite Polynomials

We give an analogue of Levin–Sodin–Yuditskii's study of the dynamical Ruelle determinants of hyperbolic rational maps in the case of subhyperbolic quadratic polynomials. Our main tool is to reduce to an expanding situation. We do so by applying a dynamical change of coordinates on the domains of a Markov partition constructed from the landing ray at the postcritical repelling orbit. We express the dynamical determinants as the product of an (entire) determinant with an explicit expression involving the postcritical repelling orbit, thus explaining the poles in d (z).     

Dynamical breaking of supersymmetry

General conditions for dynamical supersymmetry breaking are discussed. Very small effects that would usually be ignored, such as instantons of a grand unified theory, might break supersymmetry at a low energy scale. Examples are given (in 0 + 1 and 2 + 1 dimensions) in which dynamical supersymmetry breaking occurs. Difficulties that confront such a program in four dimensions are described.     

LiFePO4 晶格动力学性质的第一性原理研究

基于考虑了Fe-3d电子间的库仑作用U和交换作用J的GGA+U方案,应用第一性原理计算系统研究了LiFePO₄的晶格动力学性质.我们计算并分析了玻恩有效电荷张量、布里渊区中心的声子频率和声子色散曲线.玻恩有效电荷张量显示各向异性,佐证了LiFePO₄中锂离子沿一维通道[010]方向迁移的机理.布里渊区中心点声子频率的计算值和相应的实验结果符合得比较好. 关键词： 4')" href="#">LiFePO₄ 晶格动力学 第一性原理计算