Resources Allocation Schemas for Web Information Monitoring

The web is an extremely dynamic world where information is updated even every second. A web information monitoring system fetches information from the web continuously and finds changes by comparing two versions of the same page. The updating of a specific web page is modeled as a Poisson process with parameter to indicate the change frequency. As the amount of computing resources is limited, it is necessary to find some policies for reducing the overall change-detection time. Different allocation schemas are evaluated experimentally to find out which one is the most suitable for the web information monitoring problem. The experimental data shows the runtime characteristics of the overall system performance and the relationship to the total amount of resources.     

Editor’s note

The past several decades have witnessed great progress in the research on coordination polymers since the conception of supramolecular chemistry was advanced by Prof. Lehn, especially after the report of Prof. Robson on coordination polymers. Thanks to the development in several related fields, such as crystal engineering, supramolecular chemistry, material chemistry and solid state chemistry, the rational design and construction of coordination polymers with multiple functions has become one of the most active arenas in inorganic and material chemistry.     

Energy-Theft Detection Issues for Advanced Metering Infrastructure in Smart Grid

With the proliferation of smart grid research, the Advanced Metering Infrastructure （AMI） has become the first ubiquitous and fixed computing platform. However, due to the unique characteristics of AMI, such as complex network structure, resource-constrained smart meter, and privacy-sensitive data, it is an especially challenging issue to make AMI secure. Energy theft is one of the most important concerns related to the smart grid implementation. It is estimated that utility companies lose more than S25 billion every year due to energy theft around the world. To address this challenge, in this paper, we discuss the background of AMI and identify major security requirements that AMI should meet. Specifically, an attack tree based threat model is first presented to illustrate the energy-theft behaviors in AMI. Then, we summarize the current AMI energy-theft detection schemes into three categories, i.e., classification-based, state estimation-based, and game theory-based ones, and make extensive comparisons and discussions on them. In order to provide a deep understanding of security vulnerabilities and solutions in AMI and shed light on future research directions, we also explore some open challenges and potential solutions for energy-theft detection.     

Application and Development of LTCC for RFIC

Introduction In order to realize further progressin highfre-quency wireless communicationtechnology,systemsolution in hardware technology plays the i mpor-tant role of bringing greater higher integration,small form factors and more sophisticated func-tions.To miniaturize the RF module,three tech-nologies are needed:direct conversion one chipRFIC(System-on-Chip,SOC),bare die packagingtechnology and passive embedded substrate[1].Direct conversion one chip ICis needed to re-duce die area and…     

Cultivating Pragmatic Competence in English Vocabulary Teaching

vocabulary is one of the most important elements of the language.It is closely related with context and pragmatic.This paper intends to find out some effective method of vocabulary teaching under the pragmatic principles,exploring how to improve pragmatic competence of students in English vocabulary teaching.     

An Archean continental block in the Taihangshan and Hengshan regions: Constraints from geochronology and geochemistry

Recent research on the tectonothermal evolution and geochronology in the Fuping, Hengshan and Wutaishan metamorphic complexes, together with the discoveries of a high-pressure granulite belt in the northern margin of the North China Craton (NCC) and high-pressure metapelites in the Jingangku Group of the Wutaishan complex, suggests that there was a Neoarchean to Paleoproterozoic orogenic belt related to collision between the Eastern and Western continental blocks. Comparison of geological, geochronological, tectonothermal and geochemical data between the Fuping and Hengshan complexes suggests these two complexes most likely originated and evolved as a single lithotectonic domain (i.e., the Taihangshan-Hengshan block) during the early evolution of the North China Craton, probably as an active margin to the Eastern Continental Block. The Taihangshan-Hengshan block has been subjected to intensive and extensive tectono-magmatism and high-grade metamorphism related to collision between the Eastern and Western continental blocks at ～1.80 Ga.     

Biomimetic, Catalytic Oxidation in Organic Synthesis

1 Introduction Oxidation is one of the most fundamental reactions in organic synthesis. Owing to the current need to develop forward-looking technology that is environmentally acceptable with respect many aspects. The most attractive approaches are biomimetic oxidation reactions that are closely related to the metabolism of living things. The metabolisms are governed by a variety of enzymes such as cytochrome P-450 and flavoenzyme. Simulation of the function of these enzymes with simple trans…     

Recent progress in thermoelectric materials

Direct conversion of heat into electricity through advanced thermoelectric(TE)materials has been one of the most attractive solutions to the severe environmental and energy issues facing humanity.In recent years,great progress has been made in improving their dimensionless figure of merit(ZT),which determines the conversion efficiency of TE devices.ZT is related to three‘‘interlocked’’factors—the Seebeck coefficient,electrical conductivity,and thermal conductivity.These three factors are interdependent in bulk TE materials,and altering one changes the other two.The difficulty in simultaneously optimizing them caused TE research to stagnate,until great reductions in thermal conductivity were both theoretically and experimentally proven in nanomaterials in 1993.In this review,we first introduce some TE fundamentals and then review the most recently improvements in ZT in different kinds of inorganic and organic TE materials,which is followed by an investigation of the outlook for new directions in TE technology.     

FLOTATION DEINKING AGENTS FOR ONP RECLAIMING

Wastepaper reclaiming has received more and more concerns in recent years, and the related science and technology are becoming one of the most research hotspots in China. As an old kind of reclaimed wastepaper, ONP (old newsprint) has many advantages, for example, inks are easy to be separated and removed. Washing deinking, which demands much water consumed, is the main method for ONP reclaiming. But in China many paper mills are affected by lack of water, so they have to select flotation d…     

Rapid dendrite growth in quaternary Ni-based alloys

Dendritic growth is one of the most common micro-structural formation mechanisms during crystal growth. Its morphology provides the kinetics information of crystal growth. Therefore, it is valuable to perform the research on rapid dendrite growth in order…     

三维Lotka-Volterra系统的双Hamilton结构

考虑两个具有3个自由度的Lotka Volterra系统, 首先介绍三维系统中广义Poisson括号和广义Hamilton结构； 然后通过构造局部同胚变换, 观察得到系统的首次积分, 建立代数方程, 求解得到系统的Hamilton函数； 最后给出Lotka-Volterra系统存在双Hamilton结构的充分性条件.     

三维Lotka-Volterra系统的双Hamilton结构

考虑两个具有3个自由度的Lotka Volterra系统, 首先介绍三维系统中广义Poisson括号和广义Hamilton结构; 然后通过构造局部同胚变换, 观察得到系统的首次积分, 建立代数方程, 求解得到系统的Hamilton函数; 最后给出Lotka-Volterra系统存在双Hamilton结构的充分性条件.     

Poisson仿射群的性质

Poisson流形在现代Hamilton系统中扮演了很重要的角色,基于以前的研究,文章在李群上赋予poisson结构,提出了poisson仿射群的概念,在此基础上定义了Poisson括号,并证明了此poisson括号满足双线性,反称性,Leibniz法则及Jaco-bi恒等式,同时讨论了Poisson映射和Poisson作用的性质.     

Poisson仿射群的性质

Poisson流形在现代Hamilton系统中扮演了很重要的角色,基于以前的研究,文章在李群上赋予poisson结构,提出了poisson仿射群的概念,在此基础上定义了Poisson括号,并证明了此poisson括号满足双线性,反称性,Leibniz法则及Jacobi恒等式,同时讨论了Poisson映射和Poisson作用的性质。     

Poisson流形上组合算符的拓展

文章对组合算符η进行了拓展，在Poisson流形上定义了一种更为广泛的新算符ζ，讨论了新算符ζ的相关性质，以及其在Poisson流形的李代数结构研究中的作用。     

一类带附加装置的特殊刚体的稳定性分析

研究一类带有附加装置的特殊刚体的稳定性,通过寻找合适的Poisson结构及Hamilton函数,将刚体的运动方程转化为广义Hamilton系统.运用能量Casimir函数法分析得知,这类刚体的运动在一定条件下是稳定的.     

有关Poisson流形相关性质的讨论

文章给出了有关Poisson括号的一些性质,并利用Casimir函数对Poisson流形上的Poisson结构的性质进行了考察     

统计流形上的等仿射结构

作者首先研究了等仿射几何与贝叶斯统计学之间的关系,这里贝叶斯统计学的先验分布被看作统计流形上的体积形式,然后利用统计流形上α平行先验估计和体积形式的关系,结合子流形上的基本方程和基本公式给出了一个统计子流形上具有等仿射结构的条件.     

映射的二维不稳定流形计算

针对二维流形求解较困难的问题,提出一种新的离散映射系统二维不稳定流形的算法.该算法以成熟的数值算法为基础,首先通过求初值曲线计算均匀分布的一维子流形,再用三角形有限元逼近相邻一维子流形之间的流形面.计算一维子流形的关键思想是在流形面上找到与当前点相距合适步长的下一点,从而逐步增长流形.该步长根据当前点附近流形的弯曲程度调整.该算法不但可以快速求得流形的直观图像,而且能够准确地反映流形的变化过程.并用超混沌广义Hénon映射不动点的不稳定流形的计算验证了本算法的有效性,此外,通过计算出的直观流形图验证了稳定流形和不稳定流形的相交.     

“次二次”Hamilton系统周期解

研究“次二次”非自治Ｈａｍｉｌｔｏｎ系统的周期解问题,所用方法是分成两个分量来考虑,利用极小极大原理,建立一个临界点定理;并提出了一种新的“次二次”条件,这推广了已有的关于次二次的Ｈａｍｉｌｔｏｎ系统周期的结果。