多源数据融合技术在后备干部管理系统中的应用

随着社会信息化进程的逐步深入,各部门中已有业务系统在数据集成和信息共享方面存在不足,已达不到对信息资源整体开发利用的要求,这给后备干部信息管理工作带来了诸多不便.针对后备干部管理的业务特点和信息化的发展趋势,研发一个以数据集成和信息共享为目标的后备干部管理系统显得尤为重要.通过全面分析后备干部管理的业务需求和数据特点,提出了基于.NET平台和SQLite数据库的后备干部管理系统的设计方案,并以河南省为应用实例,验证了该系统设计方案的合理性和有效性.     

Rapid,simple and low cost fabrication of a microfluidic direct methanol fuel cell based on polydimethylsiloxane

In this paper a simple and rapid fabrication method for a microfluidic direct methanol fuel cell using polydimethylsiloxane (PDMS) as substrate is demonstrated. A gold layer on PDMS substrate as seed layer was obtained by chemical plating instead of conventional metal evaporation or sputtering. The morphology of the gold layer can be controlled by adjusting the ratio of curing agent to the PDMS monomer. The chemical properties of the gold films were examined. Then catalyst nanoparticles were grown on the films either by cyclic voltammetry or electrophoretic deposition. The microfluidic fuel cell was assembled by simple oxygen plasma bonding between two PDMS substrates. The cell operated at room temperature with a maximum power density around 6.28 mW cm^?2. Such a fuel cell is low-cost and easy to construct, and is convenient to be integrated with other devices because of the viscosity of the PDMS. This work will facilitate the development of miniature on-chip power sources for portable electronic devices.     

Electrosynthesis of Polyaniline/SiO2 Composite at high pH in the Absence of Extra Supporting Electrolyte

Summary Electropolymerization of aniline was investigated in solutions of different pH from 1.0 to 12.1 without extra supporting electrolyte. FT-IR Spectra of the polymers display characteristic absorptions for polyaniline (PANI) including that for protonated PANI, although some of the polymers were obtained in solutions of high pH. PANI obtained from acidic solutions displayed the usual electroactivities in 0.5 mol·l^-1 H₂SO₄, while those obtained from solutions of pH 6.0 to 12.1 showed an unusual redox pair additionally on cyclic voltammograms at 0.04 V vs. SCE. This redox pair can be ascribed to the redox of phenazine ring, originated from the attack of nitrenium cation to PANI chain in the ortho-position. Electrocodeposition of PANI and SiO₂ was conducted through electrophoresis of silica particles towards anode as aniline anodically electropolymerized. Energy dispersive X-ray diffraction (EDX) analysis and SEM inspection were performed on obtained PANI/SiO₂ to investigate the composite film.     

Enhancement of wetting properties of water-insoluble surfactantsvia solubilization

Water-insoluble surfactants generally show poor wetting behavior in the Draves skein wetting test. This does not appear to be due to high equilibrium or dynamic surface tension values, but to the presence of insoluble surfactant in the system. The replacement of a small percentage of the insoluble surfactant by a water-soluble one capable of solubilizing the former can produce a dramatic improvement in wetting behavior, even when the equilibrium or dynamic surface tension of the system is not significantly changed. Increase in the strength of the attractive interaction between the two surfactants generally improves the clarity of the system and decreases its wetting time.     

Some synergistic properties of N- Alkyl- 2- pyrrolidones,a New class of surfactants 1

N-Alkylpyrrolidones, a new class of commercial surfactants, interact synergistically with anionic surfactants. Mixtures of the N-2-ethylhexyl-(C2,6P), N-octyl-(C8P), N-decyl-(ClOP), and N-dodecyl-(C12P) pyrrolidones with commercial linear sodium alkylbenzenesulfonate (LAS) were investigated. Measurements of the molecular interaction parameters,β ^a, and β^M, for mixed monolayer formation and mixed micelle formation, respectively, in these mixtures indicated that the first three compounds show synergism in surface tension reduction efficiency and all four compounds show synergism in surface tension reduction effectiveness, when mixed in the proper proportions with LAS. This was confirmed experimentally. The N-alkylpyrrolidone-LAS mixtures also exhibit synergism in Ross-Miles foaming and in Draves (skein) wetting. Presented at the 70th annual meeting of the American Oil Chemists’ Society, Phoenix, Arizona, May 9, 1988. JAOCS, Vol. 66, no. 7 (July 1989)     

Calculating structures and free energies of complex molecules: combining molecular mechanics and continuum models

A historical perspective on the application of molecular dynamics (MD) to biological macromolecules is presented. Recent developments combining state-of-the-art force fields with continuum solvation calculations have allowed us to reach the fourth era of MD applications in which one can often derive both accurate structure and accurate relative free energies from molecular dynamics trajectories. We illustrate such applications on nucleic acid duplexes, RNA hairpins, protein folding trajectories, and protein-ligand, protein-protein, and protein-nucleic acid interactions.     

Performance enhancement of 1–3 piezoelectric composite materials by alternating current polarising

The performances of 1–3 piezocomposite materials under various poling conditions were compared and analysed. The dielectric, piezoelectric, and electromechanical properties of 1–3 piezocomposite materials were studied with variations in the electric field amplitude (E_p), poling frequency (f), and number of cycles (C). It was found that the piezoelectric coefficient (d₃₃), free dielectric constant (${\epsilon }_{33}^T$/${\epsilon }_0$), and electromechanical coupling factor (k_t) of 1–3 piezocomposite materials exhibit an increase of 21.4%, 13%, and 10.7%, respectively, under the optimum alternating current poling (ACP) condition (f = 1.25 Hz, E_p = 2 kV/mm, C = 16), compared with that of the samples poled using the direct current polarisation (DCP) method. The studies of the domain pattern indicate that the performance enhancement originates from the remarkable regularly striped domain structure and high domain wall density in ACP-poled samples. Our results suggest that the ACP method is effective in enhancing the performance of composite piezoelectric materials, which possess great benefits and potential for application in acoustic/medical transducers.     

先进陶瓷连接的新技术-坯体连接技术

先进陶瓷的连接技术在陶瓷研究中引入注目 ,因为它提供了一种获得以现有的技术不能制造或是制造不经济的复杂形状的陶瓷构件的方法。而今一种新的陶瓷连接技术—坯体连接出现了 ,它以简单的工艺、高效的性价比 ,赢得了世人的注目。运用新的料浆工艺和成型技术 ,坯体连接技术从传统陶瓷领域走向了先进陶瓷的领域 ,成为高性能复杂形状陶瓷构件的有效生产方法之一。     

甲型H1N1流感传播的SIR模型研究

建立了一个甲型H1N1流感传播的改进SIR模型,并用微分方程数值解中的四阶Runge-Kutta方法进行求解。用墨西哥的病例数据对模型验证表明,结果与真实数据基本吻合。SIR模型所得数据与GM(1,1)灰色预测模型数据及二次、四次曲线拟合数据作比较,可知SIR模型误差最小。     

一种新的基于序数型不完备信息系统的粗糙集方法

针对序数型不完备信息系统,提出一种改进的ROUSTIDA算法。通过定义两对象在某一序数型属性上的相似概率,求得任何两个对象在整个属性集上的相似度,以与有缺失值对象有最大的相似度的对象具有最强的修补能力为依据给出了具体的改进算法,实例分析表明该算法是行之有效的。