Observation of directional change of core field inside flux ropes within one reconnection diffusion region in the Earth’s magnetotail

Two consecutive magnetic flux ropes, separated by less than 30 s （△t 〈 30 s）, are observed within one magnetic reconnection diffusion region without strong guide field in the Earth＇s magnetotail by Cluster multispacecraft. The flux ropes are characterized by bipolar signatures of the south-north magnetic field component Bz accompanied with strong core magnetic field By, intense current J and density depletions inside of them. In spite of the small but non-trivial global scale negative guide field （-By）, there exists a directional change of the core fields of two flux ropes, i.e., -By for the first one, and ＋By for the second one. The directions of the core fields are the same as the ambient cross-tail magnetic field component （By） just outside of flux ropes. Therefore, we suggest that the core field of flux ropes is formed by compression of the local preexisting By and that the directional change of core field is due to the change of local preexisting By. Such a change in ambient By might be caused by some microscale physics.     

Extracting the core indicators of pulverized coal for blast furnace injection based on principal component analysis

An updated approach to refining the core indicators of pulverized coal used for blast furnace injection based on principal component analysis is proposed in view of the disadvantages of the existing performance indicator system of pulverized coal used in blast furnaces. This presented method takes into account all the performance indicators of pulverized coal injection, including calorific value, igniting point, combustibility, reactivity, flowability, grindability, etc. Four core indicators of pulverized coal injection are selected and studied by using principal component analysis, namely, comprehensive combustibility, comprehensive reactivity, comprehensive flowability, and comprehensive grindability. The newly established core index system is not only beneficial to narrowing down current evaluation indices but also effective to avoid previous overlapping problems among indicators by mutually independent index design. Furthermore, a comprehensive property indicator is introduced on the basis of the four core indicators, and the injection properties of pulverized coal can be overall evaluated.     

基于IXA架构的流量测量系统设计

网络流量测量技术是网络监测和管理研究的重要前提和保证. 在分析网络处理器、网络流量采集等技术的基础上,介绍流量测量系统在Intel IXA架构上的一种设计和实现. 系统的数据采样机制和数据编码格式遵守sFlow系统标准. 最后对IXP2400上实现该系统时微引擎等资源的分配作了分析,通过并行架构优化了包处理性能.     

Research of IDSS Architecture Based on Hybrid Systems

This paper discusses the necessity of building IDSS on hybrid systems, and adopts XML technology to manage isomeric knowledge in hybrid systems. The paper proposes a new architecture of hybrid systems based IDSS whose core system is isomeric knowledge system. The architecture is composed of knowledge component, problems processing system, data component and intelligent user interface. This new architecture aims to enhance the capability of integrating hybrid systems, to improve the supporting effectiveness of decision-making and the intelligent level of IDSS, and tries a new way to elevate the system＇s ability of handling and learning knowledge.     

基于IP Core的数字电路综合实验

目前IP core以及IP core的运用是行业技术发展的一大趋势。对EDA技术实验教学中的IP core的综合运用进行了探讨。所给出的例子都是利用Xilinx的ISE软件,在其FPGA（SPARTAN3A and SPARTAN3AN系列）芯片上实现了的。文中所讨论的基本要点,对初学者如何理解设计重用和运用IP core来进行综合型实验设计是有所帮助的。     

基于IXP2800处理器的IGMP Snooping协议的设计与实现

介绍了IGMP Snooping在Intel IXA架构上的设计方案,并通过对组播查询报文的监听,在IXP2800网络处理器上实现了消除冗余组播报文和快速转发组播报文的目的。     

Nonverbal deficit to understand others’minds in high function autism spectrum disorders

Deficits in understanding others’minds,evident in most individuals with autism spectrum disorders,have been suggested as a core deficit of autism.However,nonverbal ability has gone untested because most theory of mind measurement has involved verbal materials such as reading tasks.This raises the possibility that children with high function autism spectrum disorder would distinguish verbal and nonverbal component deficits.Thirty-two participants diagnosed with autism spectrum disorder by a trained psychiatr...     

Relationship between calcium and atmospheric dust recorded in Guliya ice core

By the analyses of Guliya ice core on the Tibetan Plateau, it was found that the calcium (Ca^2 ) originated from the terrestrial source is the main cation of soluble aerosol and a good proxy of the atmospheric component and environment in the mountain ice core located in the mid-low latitude arid regions. Evident variation of Ca^2 concentration has been found in the Guliya ice core since the Last lnterglaciation with two relatively strong increase periods and two weak increase periods. These variations are generally related to climatic changes: high Ca^2 concentration periods coincide with cold periods and low Ca^2 concentration periods coincide with warm periods. However, Ca^2 concentration does not always decrease (increase) with climate warming (cooling). The magnitude and phase of Ca^2 concentration does not always match temperature either. The changes of atmospheric circulation, land surface condition and atmospheric humidity might be important factors which influence Ca^2 concentration besides temperature.     

Identity Based Group Key Agreement from Bilinear Pairing

0 IntroductionMulticast isthe core component of the groupcommunica-tions .There are several schemes proposed for securemulticast . The logical key hierarchy (LKH) was proposed byWonget al[1].Inthat ,the groupcontroller (GC) maintains alogical key tree where each node represents a key encryptionkey. An opti mizationthat haves the size of the rekeying mes-sages is described by Canettiet al[2]using a pseudo-randomgenerator tree(OFCT) . Another methodis the one-wayfunc-tion protocol (OFT)[3…     

Cylindrical PCL brushes on the surface of lanthanum hydroxide nanowires by ring-opening polymerization

A core-shell hybrid nanostructure,a hard core of single-crystalline lanthanum hydroxide nanowires and a soft shell of brushes of poly (ε-caprolactone) (PCL), has been successfully prepared by ring-opening polymerization (ROP) on the surface of nanowires. Such special structures were proved by TEM images. Meanwhile, the thickness of polymer layers was measured. The chemical component and the grafted PCL quantity of the sample were characterized by FTIR and TGA, which provides a simple and universal method to...     

短讯

2006年9月18日在电子科技大学隆重举行了“电子科大-英特尔架构与应用技术联合实验室”的揭牌仪式，这是继“电子科大-英特尔IXA实验室”之后共建的第二个实验室，标志着Inter公司与学校的合作进入了一个新阶段。     

Synthesis of core–shell acrylic–polyure thane hybrid latex as binder of aqueous pigment inks for digital inkjet printing

Acrylic–polyurethane (PUA) hybrid aqueous emulsion with core–shell structure was prepared via semibatch emulsion copolymerization of the acrylate monomers (AC) in the presence of a commercial polyurethane dispersion as seeds. The core–shell structure of the emulsion was observed by TEM. The particle size and distribution of the emulsion was found to vary d rastically with the core–shell ratio. The thermal response properties of emulsion film swere measured by DSC, and the results indicated the good compatibility between PA and PU moieties in PUA hybrids. The chemical structures of emulsion films were studied by FTIR, and the surface p roperties were tested by contact angle measurement. The results supported the idea that the surface of the cast films was rich in polyurethane component. The water resistance o f the cast films became better by increasing the AC fraction. The rheological properties of the latex and its utilization as a binder for aqueous pigment inks of digital inkjet printing were thoroughly investigated , indicating that the prepared hybrid emulsion could be used safely for aqueous pigment inks of digital ink jet printing.     

Linux系统中PCI设备DMA数据传输的实现

将传统数据传输方式与存储器直接存取（direct memory access,DMA）数据传输方式进行了对比分析,结合外设组件互连标准（peripheral component interconnection,PCI）总线的特点,以嵌入式Linux系统为平台,重点分析了PCI设备驱动程序中DMA数据传输实现机制,给出了传输实现的基本结构及单元组成,并以实际例子介绍了基于PCI9080芯片的DMA传输实现。经测试验证,该方法可满足实际的传输要求。     

基于动态核PCA的复杂废水处理过程在线故障检测

为了克服废水处理过程具有较强的非线性及动态特性,研究了基于主成分分析(principal component analysis,PCA)的在线故障检测.首先在PCA的基础上引入核函数,构造核主成分分析(kernel principal component analysis,KPCA)来优化模型结构,再通过嵌入动态模型来...     

Molecular structure and biological function of proliferating cell nuclear antigen

Proliferating cell nuclear antigen (PCNA) is the core component of replication complex in eukaryote. As a processive factor of DNA polymerase delta, PCNA coordinates the replication process by interacting with various replication proteins. PCNA appears to play an essential role in many cell events, such as DNA damage repair, cell cycle regulation, and apoptosis, through the coordination or organization of different partners. PCNA is an essential factor in cell proliferation, and has clinical significance in tumor research. In this article we review the functional structure of PCNA, which acts as a function switch in different cell events.     

Observation and simulation of flux rope structures at the dayside magnetopause

The signatures of flux ropes with obvious core magnetic field are detected by Cluster Ⅱ at the dayside magnetopause during 11:00--11:15 UT on Mar. 2, 2001. The similar characteristics can be found from the magnetic fiel dvariations recorded by the four spacecrafts (Cluster Ⅱ C1--C4). All the three (-/ ) bipolar signatures in the BN component are accompanied with enhancements of BM and magnetic field strength B in the boundary normal coordinates (LMN coordinates). A MHD simulation with two dimensions and three components is performed to explore the reconnection process driven by the incoming flow of solar wind at the dayside magnetopause. The numerical results can illustrate the recurrent formation of magnetic structures with a core magnetic field. The time history of the magnetic field B and three components Bx, By and Bz at a given point of the current sheet can reproduce the observational features of the events mentioned above.     

Characteristics of gas geochemistry in Yangbajing geothermal field, Tibet

CO 2 is a main component of gases in the Yangbajing geothermal field, usually higher than 85 in volume; others are N 2, H 2S, H 2, CH 4, etc. Helium R/R a ratios, ranging from 0.14 to 0.46, indicate a crustal component to be dominant in the gases. δ 13C-CO 2 values and δ 34S-H 2S values are in the range -7.72‰--11.33‰ and 0.2‰-8.3‰, respectively. The gases are inferred to mostly derive from the partial melting of the Nyainqentanglha core complex. The gases of shallow and deep reservoirs are distinctive in chemical compositions and δ 34S-H 2S values, which shows their different flowing paths and physical-chemical processes. Sulphur does not approach isotopic equilibrium between H 2S and SO 2- 4 species in both reservoirs. Significance of steam chemical monitoring is also discussed.     

关于强core紧空间的一个刻画定理

本文引入了强core紧概念,给出了强core紧空间的一个刻画定理.其主要结果是:设X是一个拓扑空间,若X是强core紧的当且仅当对每个代数L-domainD,函数空间[X→D]是代数L-domain.     

Estimation of the Dose Rate of Spent Fuel-Related Components of Lingao Nuclear Power Plant Using ORIGEN2 and MCNP5

The components from spent fuel are discharged from the core and then stored in the framework of the spent fuel pool for cooling. However, it is of great significance to save the storage space of the spent fuel pool by shrinkage and shearing work to increase the spare fuel lattice number. In order to solve the problem of shrinkage and shearing work of spent fuel involving the problem of radioactive safety, the radioactive source item is calculated by ORIGEN2 program base on Unit 1 Ⅱ of Lingao Nuclear Power Plant(NPP), and the radiation dose rate of the related component shrinkage operation scene is simulated by the MCNP5 program. In addition, the effectiveness of shielding measures is discussed, and the maximum dose rate is within 0.35 μSv/h at the distance of 2.5 m from component center, and the maximum dose rate is almost 0 at the distance of 3.2 m from the component center. The intensity of the radiation dose produced by the related components is very low and can be neglected, which belong to the green area of NPP. The program calculation system from source term calculation to shielding calculation is established, and an engineering example is referenced, and its application and analysis are carried out. It provides a basis for radioactive safety analysis and evaluation for the shrinkage operation of spent fuel and makes the shrinkage technology of fuel-related components safer and more reliable.     

High-precision measurement of mercury isotope ratios of atmospheric deposition over the past 150 years recorded in a peat core taken from Hongyuan,Sichuan Province,China

High-precision 210Pb dating technology was applied to a peat core with a time span of about 150 years that was taken from Hongyuan, Sichuan Province, China. The concentrations of total mercury (Hg) and stable isotope compositions of mercury in the peat core were measured using a LUMEX 915 instrument and multi-collector inductively coupled plasma mass spectrometer, respectively. Total mercury (Hg) concentrations in the peat core had a clearly increasing trend from the bottom to top of the core while δ 202Hg ...