北京市信息化工作办公室网络安全处处长贾力:三年初步造就北京数字化安全新城

多年来,北京市委、市政府高度重视信息化工作,全市的 信息化建设和应用取得了明显实效。北京 作为我国首都,信息安全问题相对与其他 省市更为重要,也受到了全社会的高度关 注。尤为重要的是,2008年,北京的奥运 之年,“绿色奥运、科技奥运、人文奥运” 三大理念贯穿北京市的信息化与信息安全     

Reliability and wireability optimizations for chip placement on multichip modules

The chip placement problem of multichip module (MCM) designs is to map the chips properly to the chip sites on the MCM substrate. Chip placement affects not only the thermal characteristics of an MCM but also routing efficiency, which translates directly into manufacturability, performance, and cost. This paper presents a solution methodology for the optimal placement problem considering both thermal and routing design objectives simultaneously. The coupling is achieved through use of a hybrid-force model that is a combination of the traditional interconnection-force model and a novel thermal-force model. The placement procedure can be used as a design tool to place chips and then determine the tradeoffs which can be made in placing for reliability and wireability. Experiments on five examples including three benchmarks show that the present algorithm yields very high-quality results.     

线性浮阀在大型冷水机组中的应用

介绍新型节流装置——线性浮阀的结构、工作原理、特点及其在大型冷水机组中的应用以及实际使用中可能存在的问题，为在设计具有较高能效比的中大型冷水机组中，在节流机构选择应用上提供更大的选择空间。     

天津通信企业IT信息网络支撑平台

从系统建设背景、关键技术、创新点及应用情况等方面介绍了天津市通信公司企业IT信息网络支撑平台是一个统一、高效、简洁的综合业务网络平台。     

相变储能材料研究进展

综述了固-固相变储能材料（s-S PCMs：sofid-solid phase change materials）、固-液相变储能材料（s-1 PCMs：solid—liquid phase change materials）的主要优缺点，并主要介绍了以下2种封装方式：（1）PCMs与基体材料复合制成定型PCMs，包括：与有机高分子材料机械共混、用无机多孔材料封装；（2）PCMs微囊化。此外，还分析了PCMs的主要应用领域及PCMs的主要研究方向。     

温度敏感葡聚糖凝胶的合成及其细胞相容性研究

合成了N-异丙基丙烯酰胺（NIPAAm）与葡聚糖的共聚水凝胶，利用红外光谱表征了单体和凝胶结构，研究了水凝胶在去离子水和细胞培养基中的温度响应性，并对凝胶进行了细胞培养和脱附研究．结果表明，共聚凝胶具有很好的温度敏感性和细胞相容性，可以通过控制温度变化，实现对细胞的无损伤脱附．     

On maximum-length linear congruential-sequences-based low-density parity-check codes

This letter extends a low-density parity-check code construction using maximum-length linear congruential sequences by Prabhakar and Narayanan. The corresponding bipartite graphs of their construction were guaranteed to have a girth larger than four by a sufficient condition. However, their sufficient condition was limited to regular codes and data-node degree equal to three. The extension in this letter allows arbitrary data-node degrees and is applicable to irregular codes. Further, simpler sufficient conditions are derived and larger girths are addressed.     

Dye adsorption characteristics of alginate/polyaspartate hydrogels

This study examined the removal of some basic dyes, such as Methylene Blue, Malachite Green and Methyl Orange, using alginate or alginate/polyaspartate composite gel beads. The adsorption of dyes from aqueous solutions at 25 °C was examined using a batch sorption technique. The effects of CaCl₂ and the dye concentration on the adsorption were examined. Type-S adsorption isotherms were obtained, which is characteristic of a weak solute–solid interaction. The ionic interaction between the dye molecule and gel matrix appears to be responsible for the efficient adsorption of cationic dyes in this system. These results suggest that an alginate/polyaspartate gel can be used as an effective sorbent for water pollutants such as dyes, and the immobilization of these organic contaminants in the hydrogels from wastewater can solve one of the most important environmental problems in the related industry.