国际储能关键技术竞争态势

储能技术是新能源产业发展的关键技术,本文利用德温特创新索引数据库(DII)、Thomson Data Analyer工具分析了储能关键技术领域全球专利申请的时序分布、领域技术主题、重点国家/地区及其重点申请人等,以期了解全球储能竞争态势,为我国储能技术领域中的研发和产业化提供支撑。     

英国专利代理行业现状研究

专利代理行业是专利制度有效运转的重要支撑,也是知识产权服务业体系中的关键部分。本文从我国专利代理行业目前的最新形势出发,初步研究了英国专利代理行业的基本情况、市场准入规则以及英国特许专利律师协会的基本情况,以期对我国专利代理行业的发展提供参考。     

一种宽间隔混沌跳频序列快速生成方法

针对比特抽取法在产生混沌跳频序列时实时性不佳的问题,提出一种基于分段迭代的混沌跳频序列生成算法.将分段迭代产生的混沌映射轨道实值点表示成二进制小数,采用周期多比特重叠抽取和非线性矩阵变换相结合的方法以及改进的随机平移替代法生成宽间隔序列.仿真结果表明,在平衡性、汉明相关性、跳频间隔及抗预测能力等跳频序列性能不低于现有算法的前提下,其平均迭代次数可减少约45％,且在实时性、存储空间占用量和扩展序列周期方面具备优势.经验证,该算法适用于要求灵活更换跳频图谱的无线跳频通信系统.     

An image encryption algorithm based on spatiotemporal chaos and middle order traversal of a binary tree

This paper proposes an image encryption algorithm based on spatiotemporal chaos and middle order traversal of a binary tree. Firstly, other programming software is used to perform the middle order traversal, and the plaintext image is sorted according to the middle order traversal sequence on the permutation. Secondly, the chaotic sequence is generated using the coupled map lattice to set the chaotic interference value. Finally, the XOR operation between the adjacent pixel values of the replacement image is completed to generate the ciphertext matrix. The simulation and experimental results show that the proposed algorithm can resist typical attacks and has good robustness.     

Long-time asymptotics and the radiation condition with time-periodic boundary conditions for linear evolution equations on the half-line and experiment

The asymptotic Dirichlet-to-Neumann (D-N) map is constructed for a class of scalar, constant coefficient, linear, third-order, dispersive equations with asymptotically time/periodic Dirichlet boundary data and zero initial data on the half-line, modeling a wavemaker acting upon an initially quiescent medium. The large time $t$ asymptotics for the special cases of the linear Korteweg-de Vries and linear Benjamin–Bona–Mahony (BBM) equations are obtained. The D-N map is proven to be unique if and only if the radiation condition that selects the unique wave number branch of the dispersion relation for a sinusoidal, time-dependent boundary condition holds: (i) for frequencies in a finite interval, the wave number is real and corresponds to positive group velocity, and (ii) for frequencies outside the interval, the wave number is complex with positive imaginary part. For fixed spatial location $x$, the corresponding asymptotic solution is (i) a traveling wave or (ii) a spatially decaying, time-periodic wave. The linearized BBM asymptotics are found to quantitatively agree with viscous core-annular fluid experiments.     

基于开源GIS软件的电子地图发布系统应用初探

近年来,随着地理信息系统技术的迅猛发展和普及应用,电子地图也应运而生。电子地图的出现,给各行业带来了很大的影响。本文首先分析GeoServer、PostGIS和OpenLayers等开源GIS软件特点,其次对地图发布系统进行分析,最后通过网络把地图数据发布出来。     

Delay effect on schedule in shuttle bus transportation controlled by capacity

We study a bus schedule in a shuttle bus transportation system controlled by capacity. The motion of shuttle buses depends on the inflow rate of passengers, the number of buses, and the delayed increase of buses. The bus schedule is closely related to the dynamic motion of buses. The delayed increase of buses has an important effect on the arrival of buses. We present the delayed piecewise map model for the dynamics of shuttle buses with the delayed increase. The motion of buses changes from a stable state to an unstable state and vice versa with increasing the inflow rate. The arrival of shuttle buses oscillates with various periods in the unstable state. The dynamic transitions change highly with the delayed increase of buses. We clarify the effect of the delayed increase on the bus schedule.     

Allometry and growth: A unified view

Allometry is crucial in biology; scaling relations are implied in laws of growth of living systems. The self similarity of Gompertzian growths of biological organisms plays a key role, in this regard, in biological similitude. The origin of allometric relationships and values of the scaling exponents is a source of debate, as well as the origin of the range of biological scales. But, besides biology, scaling and growth characterize many different complex systems. Encompassing these aspects in a unified view is an interesting target. In this paper we propose a coarse but significant model that is applied to astrophysical structures and biological organisms. The inclusion of such different systems suggests applications to fields where allometry is emerging, such as economics, urban planning and the social sciences.     

Classical Representation of a Quantum System at Equilibrium

A quantum system at equilibrium is represented by a corresponding classical system, chosen to reproduce the thermodynamic and structural properties. The objective is to develop a means for exploiting strong coupling classical methods (e.g., MD, integral equations, DFT) to describe quantum systems. The classical system has an effective temperature, local chemical potential, and pair interaction that are defined by requiring equivalence of the grand potential and its functional derivatives with respect to the external and pair potentials for the classical and quantum systems. Practical inversion of this mapping for the classical properties is effected via the hypernetted chain approximation, leading to representations as functionals of the quantum pair correlation function. As an illustration, the parameters of the classical system are determined approximately such that ideal gas and weak coupling RPA limits are preserved (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

Density of stable convex semi-infinite vector optimization problems

In this paper, we show that every convex semi-infinite vector optimization (CSVO for brevity) problem can be arbitrarily approximated by stable CSVO problems, i.e., the set of all stable CSVO problems (the weak solution map is continuous or the solution map is upper semicontinuous) is dense in the set of all CSVO problems with the given topology.