基于语议网格的政府长期档案管理系统的开发

长期保存（LTP）是一个极具吸引力的新研究领域,其目标是使档案的持续性能保持一段可预见的足够时间。然而这项研究一开始就遭遇了诸多挑战,比如归档时框架、正规方法和工作流模型的缺失,进一步的亏损无法保持档案间的互操作性,以及无信息衰减迹象的信息丢失等。本研究旨在探究各类文件的LTP如何不受时间演变、技术、数字环境变化的影响。基本需求源于存储管理与信息管理的整合,以及数据、元数据、索引等的安全保存。 本文介绍了政府档案管理和知识管理LTP流程有关上述需求的演变发展。资源的有效搜索、数据的有效存储/访问、一致的用户界面、共置备份的恢复图、以及认证和安全管理的动态调整构成随后的任务。接着,论文详细阐述了示范语义数据网格及其注解和服务配套机制,这当中本体起到关键作用。最后,论文总结了习得经验,以及有关LTP语义网格的未来工作。     

Structural Basis for the Improved Potency of Peroxisome Proliferator‐Activated Receptor (PPAR) Agonists

The need to develop safer and more effective antidiabetic drugs is essential owing to the growth worldwide of the diabetic population. Targeting the PPAR receptor is one strategy for the treatment of diabetes; the PPAR agonists rosiglitazone and pioglitazone are already on the market. Here we report the identification of a potent PPAR agonist, 15 , whose PPARγ activation was more than 20 times better than that of rosiglitazone. Compound 15 was designed to incorporate an indole head with a carboxylic acid group, and 4‐phenylbenzophenone tail to achieve a PPARγ EC₅₀ of 10 nM . Compound 15 showed the most potent PPARγ agonist activity among the compounds we investigated. To gain molecular insight into the improved potency of 15 , a structural biology study and binding energy calculations were carried out. Superimposition of the X‐ray structures of 15 and agonist 10 revealed that, even though they have the same indole head part, they adopt different conformations. The head part of 15 showed stronger interactions toward PPARγ; this could be due to the presence of the novel tail part 4‐phenylbenzophenone, which could enhance the binding efficiency of 15 to PPARγ.     

Evolutionary Fuzzy ARTMAP Neural Networks and their Applications to Fault Detection and Diagnosis

In this paper, two mutation-based evolving artificial neural networks, which are based on the Fuzzy ARTMAP (FAM) network and evolutionary programming, are proposed. The networks utilize the knowledge base extracted from a set of data to perform search and adaptation. The performances of the two networks are assessed using benchmark problems, with the results analyzed and discussed. The effects of the network parameters are evaluated through a parametric study. The applicability of the networks is also demonstrated using a real fault detection and diagnosis task in a power generation plant. The experimental results consistently indicate the usefulness of the proposed evolutionary FAM-based networks in yielding good classification performances with parsimonious network structures.     

Enhancing empathy instruction using a collaborative virtual learning environment for children with autistic spectrum conditions

Empathy is an essential part of normal social function that people with autism spectrum conditions (ASCs) lack. This study uses the intervention of enhancing empathy via 3D animated scenarios of empathy in a virtual learning environment to help those deficient in empathy. Specifically, this study explores the understanding of empathy, perspective-taking and the performance of understanding of empathy via a collaborative virtual learning environment (CVLE) - empathy system. The study, which used CVLE - 3D empathy systems and three participants diagnosed with ASCs, conducted multiple baseline research for evidence of improved understanding of empathy via system usage. This experimental study lasted 5 months and the experimental results indicate that using the CVLE 3D empathy system had significant and positive effects on participant use of empathy, both within the CVLE 3D empathy system and in terms of maintaining learning in understanding empathy.     

Synthesis,characterization and thermal properties of novel epoxy/expandable graphite composites

Epoxy resins are widely used as coatings, adhesives and primers and in semiconductor encapsulation. A requirement that has recently gained importance is that of flame resistance, and imparting flame retardancy to epoxy resins has attracted much attention. Expandable graphite (EG) can improve flame‐retardant properties of polymers. Due to poor compatibility between polymer matrix and EG, flame‐retardant performance will be impaired. EG can be functionalized using a coupling agent. This gives rise to covalent bonding between organic and inorganic phases. This will improve the compatibility between filler and polymer to enhance the thermal stability of composites. X‐ray photoelectron spectroscopy was used to characterize the functionalizing reaction between coupling agent and EG. Thermogravimetric analysis (TGA) and integral procedural decomposition temperature (IPDT) were used to calculate the thermal stability of composites. The results show that functionalized EG can improve the thermal stability of the composites. TGA/mass spectroscopy (MS) shows that the amount of toxic gases liberated from the composites is less than that from pure epoxy. Novel epoxy/EG composites were prepared successfully via the sol–gel method. The results of TGA, IPDT and TGA/MS showed that functionalized EG can enhance the thermal stability of composites and can suppress the production of toxic gases. The composite materials could provide a safer choice. Copyright © 2009 Society of Chemical Industry     

Synthesis, characterization and hydrolysis of aromatic polyazomethines containing non-coplanar biphenyl structures

New polyazomethines containing electron-withdrawing trifluoromethyl group and non-coplanar biphenyl structures were prepared at room temperature under reduced pressure. It was found that these polyazomethines would undergo hydrolysis in DMSO solution at temperature higher than 50 °C. The hydrolysis, evidenced by ¹H NMR spectra and GPC chromatograms, was resulted from the reverse reaction of azomethine formation and was facilitated at higher temperature. The GPC results also suggested that post-polymerization would be possible if polyazomethine films were heated at elevated temperature (200 °C) under reduced pressure (0.27 torr). The HOMO (−5.69 to −5.96 eV) and LUMO (−3.04 to −3.18 eV) energy levels of the new polyazomethines are much lower than those of other polyazomethines. Combined with the excellent solubility and good thermal stability, non-coplanar biphenyl structure containing electron-withdrawing trifluoromethyl group could be a new candidate as electron acceptor for the structure design of new conjugated polymers.     

A novel and rapid fabrication for microlens arrays using microinjection molding

This work reports a novel and effective procedure for manufacturing the mold insert of microlens arrays. First, the microlens arrays master is formed using room‐temperature imprint lithography and photoresist reflow process. Next, electroforming is carried out to fabriccate the metal mold insert from the master. Finally, microinjection molding is used to replicate the molded microlens arrays. The 200 × 200 arrays of molded microlens, with a diameter of 150 μm, a pitch of 200 μm, and a sag height of 11.29 μm for polycarbonate (PC) material and 11.24 μm for polymethylmethacrylate (PMMA) material have been successfully fabricated. The moldability for PMMA material is better than PC material on molded microlens arrays. The average surface roughness of the molded microlens arrays is 4.53 nm for PMMA material and 4.81 nm for PC material. The mold temperature is the most important processing factor for the focal length and sag height of molded microlens arrays. POLYM. ENG. SCI., 2011. © 2010 Society of Plastics Engineers.     

Strain gradient theory based on a new framework of non-local model

A new framework of non-local model for the strain energy density is proposed in this paper. The global strain energy density of the representative volume element is treated as a non-local variable and can be obtained through a special integral of the local strain energy density. The local strain energy density is assumed to be dependent on both the strain and the rotation-gradient. As a result of the non-local model, a new strain gradient theory is derived directly, in which the first and second strain gradients, as well as the triadic and tetradic stress, are introduced in the context of work conjugate. For power law hardening materials, size effects in thin metallic wire torsion and ultra-thin cantilever beam bend are investigated. It is found that the result predicted by the theoretical model is well consistent with the experimental data for the thin wire torsion. On the other hand, the calculation result for the micro-cantilever beam bend clearly shows the size effect.     

Effects of argon sintering atmosphere on luminescence characteristics of Ca6BaP4O17:Sm3+ phosphors

In this paper, Ca₆BaP₄O₁₇:Sm³⁺ and Li⁺ co-doped Ca₆BaP₄O₁₇:Sm³⁺ phosphors were synthesized in air and argon atmospheres using a solid-state reaction method. The phosphor morphologies and crystal structure were studied using scanning electron microscopy and X-ray diffraction, respectively. The emission and absorption characteristics were investigated using photoluminescence emission spectroscopy and diffuse reflectance spectroscopy. The surface states and composition of phosphor were investigated using X-ray photoelectron spectroscopy. The emission integrated intensities of the phosphors sintered in an argon atmosphere increased 3.5 fold than the ones sintered in air atmosphere, with Li⁺ ions becoming embedded in the lattice of the Ca₆BaP₄O₁₇:Sm³⁺ phosphor. This occurs because there are fewer defect/oxygen vacancies and less of the secondary phase forms, leading to better Sm³⁺ emission. The results suggest that sintering a mixture of the raw materials of a phosphor in an argon atmosphere is a good approach for synthesizing Ca₆BaP₄O₁₇:Sm³⁺ phosphor powders. The color purity and CIE values of an optimized phosphor sample sintered in an argon atmosphere with an Li⁺ ion compensator were calculated to be ~ 99.6% and (0.612,0.386) in the orange–red region under 405-nm excitation, respectively. Moreover, the solid solubility of Sm³⁺ ions in the Ca₆BaP₄O₁₇ host can be enhanced by using an argon atmosphere in the synthesis process.