语义Web服务的自动化组合方法：研究综述

语义Web服务的提出是为了解决Web服务资源在语义Web中的智能化整合问题,而语义Web服务的自动化组合技术作为这个整合过程中的一个关键技术正在蓬勃发展。本文考察了来自人工智能领域、形式化方法和自动推理等领域的众多服务组合方案,讨论了各种方法的原理和优劣之处,并探索了将来的研究工作和趋势。     

心电诊断模糊专家系统开发与研究

以领域专家的理论知识和经验知识为基础,采用了模糊推理,建立了心电诊断模糊专家系统的模型,克服了知识工程师对规则难以总结提取的困难,讨论了趋于增长的合成推理规则(CRI)方法,最后给出了实验结果。     

防止炼锌电炉炉底积铁的生产实践

叙述了炼锌电炉炉底积铁形成的机理,探讨了炉料成分、炉温、电极插入深度、渣型、还原剂配比等因素对积铁形成的影响,介绍了防止积铁产生的措施。     

柱面波分解测量反射系数的一些分析

论述了对于用声全息反演法测量水声材料任意入射角的反射系数,用柱面波分解比平面波分解优越的理由,平面波分解计算采用快速傅立叶变换受到波数域的分辨率及声波波长的限制,不能测量到任意入射角的反射系数;而柱面波分解理论则无上述限制,能测量任意入射角的反射系数,柱面波分解法利用了声源及测试材料声反射面的轴对称性,只需测量半径方向上的复声压数据,极大地减少了工作量。随后以水中8毫米厚的铝板为例,通过数值模拟,分析了测量过程中各种因素对测量精度的影响,这些因素包括测量半径、阵元及阵位置误差、阵元间隔、测量面高度的定位误差等,指出了实际测量过程中对这些因素均有很高的要求,低频条件下声源若不满足指向性很高的要求,测量大入射角的反射系数仍然存在困难。     

丙烯腈-丙烯酰胺共聚物的合成与性能研究

采用水相沉淀聚合法制备了含有0～25mol％丙烯酰胺（AM）的丙烯腈（AN）-丙烯酰胺共聚物，采用傅立叶变换红外光谱（FTIR）、核磁共振光谱（NMR）、差示扫描量热仪（DSC）、热重分析（DTG）和X射线衍射分析（XRD）等方法对聚合产物进行了表征。结果表明，聚合产物中AM的摩尔含量略高于投料比，随AM摩尔含量的增加，共聚物的分解温度先降低后又升高。共聚物中AM含量为20mol％时分解温度仅为262．5℃；放热量先减少后增加。AM的引入将聚合物的环化机理从自由基环化机理过渡为离子基环化机理。     

A meta-analysis of writing instruction for adolescent students.

There is considerable concern that the majority of adolescents do not develop the competence in writing they need to be successful in school, the workplace, or their personal lives. A common explanation for why youngsters do not write well is that schools do not do a good job of teaching this complex skill. In an effort to identify effective instructional practices for teaching writing to adolescents, the authors conducted a meta-analysis of the writing intervention literature (Grades 4-12), focusing their efforts on experimental and quasi-experimental studies. They located 123 documents that yielded 154 effect sizes for quality of writing. The authors calculated an average weighted effect size (presented in parentheses) for the following 11 interventions: strategy instruction (0.82), summarization (0.82), peer assistance (0.75), setting product goals (0.70), word processing (0.55), sentence combining (0.50), inquiry (0.32), prewriting activities (0.32), process writing approach (0.32), study of models (0.25), grammar instruction (- 0.32). (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

水提取栀子成分含量分析

对栀子果的水浸提液成分进行分析,结果表明:栀子全果中的藏红花素和藏花酸的含量较高;浸提温度升高有利于绿原酸、栀子苷的溶出,但不利于栀子色素的提取;在pH=6~8范围内,pH值升高利于色素提取,绿原酸和栀子苷的溶出量不受pH值影响,为纺织印染行业应用天然栀子色素提供了依据.     

Elucidation of interactive effects of synthesis conditions on the characteristics of mesoporous silicas templated using polyoxide surfactant

A series of mesoporous silicas (MS-1-MS-9) were synthesized at different gel compositions using a triblock copolymer (TCP), poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide), as the surfactant. The interactive effects of acidity, the contents of tetraethyl orthosilicate (TEOS) and the surfactant, and the gelling temperature on the characteristics of the final material were simultaneously characterized. Increasing acidity favored mesopore formation. A material with a surface area of 760 m²/g, mostly in the mesoporous range, was obtained at 1.0(TEOS):0.017(TCP):7.3HCl:115.7H₂O. Mesopore formation was predominantly determined by the TEOS:TCP ratio and was promoted with its increase from 1.56:1 to 2.09:1. A further increase to 2.61:1 was detrimental. Whereas increasing the TCP content to 3.5% w/w improved micellization, a further increase to 4.6% should be avoided. Mesoporous silicas showed low crystallinity but a high degree of hexagonal mesoscopic organization. The weak surface acidity was attributed to surface silanols, the number of which was proportional to mesoporosity.     

丙烯腈二元共聚体系竞聚率的红外光谱测定

针对丙烯腈（AN）和丙烯酸氨基酯（F）二元溶液共聚合体系，借助于红外光谱的特征峰吸光度比，测定其共聚物组成，用Mayo-Lewis微分组成方程计算竞聚率。将两种单体的均聚物共混作标样，绘制A1/A2～m/n标准曲线，由共聚物中两特征峰的吸光度比计算组成，得到合理的竞聚率值为r1=0．7015，r2=2．3735。     

Interfacial chemistry control in thin film solar cells based on electrodeposited CuIn(S,Se)2

In this work, we present a study on CuIn(S,Se)₂ absorbers prepared by electrodeposition followed by rapid thermal annealing promising to lower manufacturing cost. However the annealed material contains copper sulpho-selenide of Cu(S_y,Se_1 − y) type which is harmful for the electrical properties of photovoltaic devices. These phases are removed by a cyanide etching. Because of an intrinsic variability of absorber fabrication process, the presented survey is based on statistic approach. We highlighted the influence of a cyanide treatment on surface and bulk compositions. The surface composition follows a distribution according to a Cu(S,Se)-CuIn(S,Se)₂ system and the bulk composition agrees with Cu(S,Se)₂-CuIn₃(S,Se)₅ system. Moreover, surface composition can be modified by adjusting the cyanide concentrations of etching solution without any changes in the bulk one. It ensues that Cu(S,Se) is not only present on the surface but also in the bulk of samples.