Local structure and thermodynamics of a core-softened potential fluid: theory and simulation.

Phase behavior and structural properties of homogeneous and inhomogeneous core-softened (CS) fluid consisting of particles interacting via the potential, which combines the hard-core repulsion and double attractive well interaction, are investigated. The vapour-liquid coexistence curves and critical points for various interaction ranges of the potential are determined by discrete molecular dynamics simulations to provide guidance for the choice of the bulk density and potential parameters for the study of homogeneous and inhomogeneous structures. Spatial correlations in the homogeneous CS system are studied by the Ornstein-Zernike integral equation in combination with the modified hypernetted chain (MHNC) approximation. The local structure of CS fluid subjected to diverse external fields maintaining the equilibrium with the bulk CS fluid are studied on the basis of a recently proposed third order+second order perturbation density functional approximation (DFA). The accuracy of DFA predictions is tested against the results of a grand canonical ensemble Monte Carlo simulation. Reasonable agreement between the results of both methods proves that the DFA theory applied in this work is a convenient theoretical tool for the investigation of the CS fluid, which is practically applicable for modeling numerous real systems.     

Investigation of bending modulus of fiber-reinforced syntactic foams for sandwich and structural applications

Polymer composite foams or syntactic foams containing 0.9, 1.76, 2.54, 3.54 and 4.5 vol% of E-glass short fibers were processed and subjected to a three-point bending test. The results show that the flexural modulus increased with fiber content, with the exception of 1.76% and 3.5% of fibers. This deviation was due to a higher void content for 1.76% and a non-uniform distribution of fibers in the polymer composite foam system for 3.5%. However, in general, the incorporation of chopped strand fibers improved the flexural behavior of the syntactic foam system without much variation in density, thus making the reinforced syntactic foams act as improved core materials for sandwich and other structural applications. Copyright © 2007 John Wiley & Sons, Ltd.     

UF6 plasma chemistry reconstitution experiments using high-temperature fluorine

Prior results indicate techniques have been developed for fluid mechanical confinement of high-temperature uranium hexafluoride (UF₆) plasma for long test times while simultaneously minimizing uranium compound deposition on the walls. Follow-on investigations were conducted to demonstrate a UF₆/argon injection, separation, and reconstitution system for use with rf-heated uranium plasma confinement experiments applicable to UF₆ plasma core reactors. A static fluorine batch-type regeneration test reactor and a flowing preheated fluorine/UF₆ regeneration system were developed for converting all the nonvolatile uranium compound exhaust products back to pure UF₆ using a single reactant. Pure fluorine preheat temperatures up to 1000 K resulted in on-line regeneration efficiencies up to about 90%; static batch-type experiments resulted in 100% regeneration efficiencies but required significantly longer residence times. A custom-built, ruggedized time-of-flight (T.O.F.) mass spectrometer, sampling, and data acquisition system permitted on-line quantitative measurements of the UF₆ concentrations down to 30 ppm at various sections of the exhaust system; this system proved operational after long-time exposure to corrosive UF₆ and other uranium halides.     

连铸坯液相穴长度的测定研究

介绍了两种测量液相穴长度的方法——射钉法和数学模型法。将射钉法所测量的结果与数学模型计算的结果进行了比较，结果表明，射钉法具有测量准确，成本低廉等优点，值得推广使用。     

基于ARM内核的网络收音机的设计与实现

文中在简介了ARM内核的特点和EP7312CPU的资源情况后，介绍了基于目前最常用的IP内核ARM内核的．网络收音机的功能设计及其基本设计思想，以及网络收音机的软硬件设计方案，尤其对网络收音机的软件设计进行了详细的介绍，这是网络收音机最关键的部分．论文对基于ARM的嵌入式系统设计有较大的参考价值．     

以社会主义核心价值体系为导向进一步加强和改进大学生思想政治教育工作

高等学校肩负着培养社会主义事业的合格建设者和可靠接班人的重任,把社会主义核心价值体系融入大学生思想政治教育的全过程,使社会主义核心价值体系的基本要求得到切实贯彻和落实,对于团结、引领青年大学生在思想上、道德上共同进步,具有十分重大的意义。     

液芯光纤中CCl4的拉曼光谱分析

最近发展起来的光纤拉曼技术,它可以提高自发拉曼光谱强度103倍,降低受激拉曼光谱的阈值功率密度10-3.液芯光纤自问世以来,在传感、光谱分析、非线性光学等研究中都取得了重要研究成果.CCl4作为液芯光纤中的芯,它的振动特性对光纤的性质起着至关重要的作用.     

铁基纳米晶玻璃包裹丝的直径对巨磁阻抗效应的影响

采用高频感应加热熔融拉引法制备F_e73.5C_u1Nb₃Si_13.5B₉玻璃包裹合金非晶丝，其中金属芯的直径为16～50 μm，经570 ℃退火处理得到具有最佳软磁性能的玻璃包裹纳米晶丝.研究其巨磁阻抗效应，发现随金属芯直径的增大，丝的磁阻抗变化先增大后减小，在30 μm时具有最大磁阻抗变化为251%.     

培育企业核心竞争力中的知识转移

从企业核心竞争力的内涵和外延入手,简述了知识转移在培育跨国公司核心竞争力中的意义,提出了培育企业核心竞争力的知识转移的对策。     

如何建立正确的学术期刊评价体系——兼论《核心期刊与期刊评价》

通过对《核心期刊与期刊评价》一书的解读，提出了现行的核心期刊和期刊评价体系已经发生扭曲的论点，并探讨如何建立科学完善的核心期刊遴选和评价制度。