西安地区既有居住建筑节能改造初探

针对西安地区既有居住建筑能耗大的问题,本文通过论述既有居住建筑改造现状和能耗现状,并对其能耗进行分析,指出西安地区既有居住建筑节能改造的重点在于围护结构的改造和周边环境的改进。同时,提出了相关的节能改造措施,希望能为西安地区既有居住建筑节能改造提供参考。     

A reassessment of Asian pacific excellence programs in higher education: the Taiwan experience

With the growth of competition between nations in our knowledge-based world economy, excellence programs are becoming a national agenda item in developing as well as developed Asian countries. The main purpose of this paper is to compare the goals, funding policies and selection criteria of excellence programs in China, Japan, Korea and Taiwan and to analyze the academic achievement of their top ranked universities in three areas: research output, internationalization, and excellence, by using data from the Shanghai Jiao Tong, QS, and HEEACT rankings. The effectiveness of Taiwan??s ??Development Plan for World Class Universities and Research Centers of Excellence?? was assessed as a case study in the paper via a survey targeting on 138 top administrators from 11 Taiwan??s universities and 30 reviewers. The study found that more funding nations had, the more outputs and outcomes they would gain, for example China. The Taiwan case demonstrates that world-class universities and research centers are needed in Asian nations despite the concerns for inequality which they raise.     

平板电视可靠性MTBF的管控论述

越来越多平板电视厂商意识到要通过提高产品的可靠性来提高品牌美誉度和降低售后三包成本.因此,该文论述了可靠性的衡量指标MTBF和统计方法,并且研究如何在开发阶段进行MTBF鉴定,以及到量产阶段仍然进行有效监控.可以直观地指导厂商进行平板电视可靠性管控.     

Synthesis and microphase separation of polystyrene‐b‐polylactide block copolymers aimed at preparation of ordered nanoparticle/block copolymer hybrid materials

A new nanoparticle/block copolymer (NP/BCP) hybrid material combining the unique properties of BCP poly(styrene)‐b‐poly(d ‐lactide) (PS‐b‐PDLA) and inorganic NP quantum dots CdSe was developed. A systematic study on the microphase separation of a series of PS‐b‐PDLAs by small‐angle X‐ray scattering showed that the degree of order of the separated microdomains depended on the initial state of the BCP and the measurement temperature and can be improved through isothermal crystallization of PDLA, thermal annealing and shear field etc. Incorporating a small amount of NPs into the BCP matrix can improve the mobility of the polymer chains and thus promote self‐assembly of the BCP, which leads to hierarchically ordered structures. Excess NPs, however, cannot be completely incorporated into the PDLA domains, resulting in the phase transformation of the BCP, destruction of the ordered structure and even macroscopic phase separation due to the aggregation of NPs. An important observation is that stereocomplexation between PDLA and poly(l ‐lactide) could provide a driving force to promote microphase separation of the BCP. The strategy presented in the current work has potential applications for developing highly ordered NP/BCP hybrid materials. © 2014 Society of Chemical Industry     

浆染长车改善染色效果的实践

传统浆染长车染色由于染槽数量限制,存在染色深度不足、染色牢度较差等问题,易造成染料浪费。通过在浆染长车中加入一组烘筒,对色纱进行烘燥以去除纱线中残存的大部分水分,再继续染色,可使牛仔面料颜色深度和牢度明显提升,丰富了牛仔纱染色工艺。     

一种新型宽频带圆极化球螺旋馈源

提出了一种新型宽频带圆极化球螺旋馈源,给出了球面螺旋的几何关系和理论分析,得到了辐射场的解析关系和不同模式下远场的表达式.运用该理论进行工程设计并进行了实际测试,测试结果与理论分析的吻合,验证了理论分析和工程设计的正确性.与传统圆极化馈源相比,该馈源具有结构简单、频带宽、体积小等优势.