开放式企业信息系统的构架与实践研究

Ｉｎｔｒａｎｅｔ问世为传统的企业信息系统开辟了崭新的思路，利用Ｉｎｔｒａｎｅｔ技术改造传统企业ＭＩＳ，建立开放式企业信息系统必成为新的潮流，本文就基于Ｉｎｔｒａｎｅｔ开放式企业信息系统进行了研究，并地其层次结构、信息处理方式进行了探讨。     

烟气脱硫技术的开发动向

着重介绍发达国家在湿式烟气脱硫系统中采用的几项新技术和新开发的几种干式烟气脱硫技术。     

一种围棋定式的机器学习方法

提出了一种围棋定式的机器学习方法。利用此方法可实现从棋谱库中自动提取定式并生成定式库。此外，对于棋谱数量较大的情况，采用分阶段学习方法，提高了学习效率。应用此方法，时34000局棋谱进行处理，得到定式点680638个。最后，还给出了1种基于组合博弈理论在计算机围棋博弈系统中使用定式的方法。     

Refinement of packet size in low carbon bainitic steel by special thermo-mechanical control process

The packet size of bainitic steel can be refined by a special relaxation-precipitation-control phase transformation (RPC) technology, When processed by RPC process, the low carbon bainitic steel composes of two kinds of main intermediate transformation phases. One is ultra-fine lath-like bainitic ferrite and the lath is less than 1 tam in width and about 6 tam in length; the alignment of laths forms a refined packet, and the size of packets is about 5-7 ~am in length and about 3-4 tam in width, The other is acicular structure. The morphology and distribution of these acicular structures are influenced by relaxation process, the thin and short acicular structures cut the prior austenite grain and refine the bainitic packet size, For the optimum relaxation time, the packet size can be refined to the finest. The mechanical properties are influenced by relaxation time and the 800 MPa grade low carbon bainitic steel with excellent toughness can be obtained by RPC process,     

跨社区访问的两阶段授权与验证

文章从分析信息网格跨社区共享的环境和要求出发,提出了两阶段授权和验证的概念。在信息网格的各管理域中,访问控制机制和策略都可能是异构的,这给跨社区的共享授权带来了很大的困难。两阶段的授权是首先将共享权限作为一个整体授予使用资源的社区,然后再由它对社区内的用户进行权限分配。通过将跨社区的授权和验证分为功能和目的不同的两个阶段来实现,可以较好地满足信息网格中资源共享对访问控制的需要。     

Field Emission Properties of Nano-DLC Films Prepared on Cu Substrates by Pulsed Laser Deposition

Nano-diamond like carbon (DLC) thin films were prepared on fused silica and Cu substrates by the pulsed-laser deposition technique with different laser intensities. Step-measurement, atomic force microscope (AFM), UV-VIS-NIR transmittance spectroscopy and Raman spectroscopy were used to characterize the films. It was shown that the deposition rate increases with the laser intensity, and the films prepared under different laser intensities show different transparency. Raman measurement showed that the content of sp³ of the Nano-DLC thin films decreases with the laser intensity. The field emission properties of the Nano-DLC thin films on Cu substrates were studied by the conventional diode method, which showed that the turn-on field increases and the current density decreases with sp³ content in the films. A lower turn-on field of 6 V/um and a higher current density of 1 uA/cm² were obtained for Nano-DLC thin films on Cu substrate.     

Synthesis of highly transparent and heat‐resistant polyimides containing bulky pendant moieties

A new diamine with bulky pendant biphenyl and ortho‐position dimethyl structures, 4,4′‐((1,1′‐biphenyl)‐4‐ylmethylene)bis(2,6‐dimethylaniline), was synthesized via a one‐pot reaction of 4‐biphenyl carboxaldehyde and 2,6‐dimethylaniline. The diamine was employed to polymerize with several dianhydrides via one‐step condensation under high‐temperature conditions. The light yellow or colorless polyimide (PI) films obtained were found to have cut‐off wavelengths in the range 286–358 nm and transmittance over 80% in the visible region (400–780 nm). Meanwhile, these PIs possessed excellent solubility in common organic solvents, even in low‐boiling‐point solvents such as chloroform (CHCl₃), dichloromethane (CH₂Cl₂) and tetrahydrofuran. The glass transition temperatures (T_g) of the PIs were determined to exceed 343 °C, even to 456 °C. All PI films were flexible with a tensile strength of 78–119 MPa, a Young's modulus of 2.0–2.5 GPa and elongation at break of 4.0%–8.2%. Therefore, these colorless PIs can be used as candidate materials for flexible display substrates. © 2019 Society of Chemical Industry     

Recovering CH4 from natural gas hydrate with CO2 in porous media below the freezing point

The recovery of methane from gas hydrate layers that have been detected in permafrost regions is a promising perspective in the future. In order to study the replacement characteristics of CO₂–CH₄ hydrate in permafrost environments, simulation experiment was carried out in this work. The results indicated that the replacement rate and efficiency increased with the increasing of injection pressure of CO₂ gas. And the replacement rate and efficiency reached up to 0.403?mmol/h and 13.20% during the experiment. Furthermore, the results also showed that the replacement rate of CO₂–CH₄ hydrate was slower below the freezing point.     

Study on the preparation,characterization, and release behavior of carbosulfan/polyurethane microcapsules

Polyurethane, a controlled release material, has been widely applied in many fields due to its high thermal and mechanical stability, corrosion resistance, and low cost. In this article, we prepared carbosulfan/polyurethane microcapsules by an interfacial polymerization method using modified isocyanate as the precursor and triethanolamine as a curing agent. The microcapsules were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis, and their release kinetics, chemical stability, and the safety of wheat seeds coating were also detected. The microcapsules had an excellent encapsulation efficiency and loading ability for carbosulfan ∼96.23% and 50%, respectively. Furthermore, the microcapsules improved the chemical stability of the carbosulfan and exhibited an excellent sustained release property (above 30 days), which controlled the carbosulfan and carbofuran at an appropriate level for reducing the adverse effects on the environment and agricultural products. The coated wheat seeds germination rate test showed that compared with the emulsifiable concentrate, the microcapsules almost had no effect on the germination rate, plant height, and root length. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43844.