气凝胶建筑玻璃透光隔热性能及影响因素

新型气凝胶玻璃具有良好的透光隔热性能,作为高性能建筑玻璃能有效降低建筑能耗。通过气凝胶颗粒粒径和填充厚度设计,制成8种不同结构的气凝胶填充玻璃;实验研究了气凝胶颗粒粒径与填充厚度对气凝胶玻璃透光和隔热性能的影响。结果表明:当气凝胶粒径从0.41mm增大到0.93mm时,玻璃透光率明显增大,而当气凝胶粒径继续增大时透光率变化不大;当气凝胶粒径从0.41mm增大到2.7mm时,气凝胶玻璃传热系数增大约15%;相对于普通玻璃,相同尺寸的普通玻璃传热系数最多可降低51.43%。采用玻璃隔热实验测试研究了气凝胶玻璃与普通中空玻璃的隔热温差,结果表明,气凝胶玻璃较普通玻璃隔热效果提高5.4~10.2℃。     

气凝胶节能玻璃的研究与应用进展

我国建筑能耗呈快速增长趋势,而透明围护结构作为建筑节能的薄弱环节,使节能型玻璃日益受到关注。其中,气凝胶玻璃由于具有超级绝热和透光性好等优点成为近年来的研究热点。综述了气凝胶玻璃的几种构造形式,包括气凝胶涂膜玻璃、整块状气凝胶玻璃和颗粒气凝胶填充玻璃;针对目前在商业应用中占主导地位的颗粒气凝胶填充玻璃进行了详细阐述,并对气凝胶填充玻璃的发展和应用前景进行了展望。     

SiO_2气凝胶在建筑中的应用探究

气凝胶具有良好的绝热、透光、防火和隔声性能,是未来建筑节能技术中理想的新型建筑材料。在总结气凝胶性能和对比传统隔热材料的基础上,探究气凝胶材料在建筑侧窗、屋顶、建筑墙体中的构造做法,通过工程实例对比了使用气凝胶材料前后的建筑节能改造效果,分析气凝胶在建筑围护结构中应用的优缺点及亟待解决的问题,并对气凝胶在建筑中的应用前景进行展望。通过借鉴海外学者对气凝胶的最新研究成果,对气凝胶在建筑中的应用进行学习交流,旨在促进气凝胶在我国建筑中的应用。     

气凝胶材料及其在建筑节能领域的应用

气凝胶是一种新型的绿色建筑节能材料?本文主要介绍了气凝胶材料的种类,制备方法及气凝胶材料的优良特性;气凝胶材料的低导热性?优异的绝热和隔音性能?很好的耐火性能?优异的保温?防水?透光性能等展示了其在建筑节能领域具有广阔的应用前景?     

气凝胶性能、粒径及填充厚度对气凝胶玻璃性能影响研究

气凝胶玻璃是新型建筑围护结构优质产品,能有效降低能耗损失,目前国内外以颗粒气凝胶玻璃为主。本试验选择6种不同粒径范围气凝胶颗粒（6～8目、8～10目、10～12目、12～14目、14～16目、16～18目）及4种不同填充厚度中空玻璃（5.5mm、6mm、8mm、10mm）进行复合,研究两种因素对透光效果及隔热效果的影响。结果表明,在相同填充厚度下,气凝胶玻璃填充颗粒粒径在8～16目时,随着颗粒粒径减小,透光率逐渐降低,而当粒径在16～18目时,可见光透射率反而提升。填充颗粒粒径相同时,填充厚度越小,可见光透射率越高。将气凝胶玻璃与传统中空玻璃对比,透光率有所降低的同时,传热系数大幅降低,在100℃光线照射下,气凝胶玻璃隔热效果随着颗粒粒径减小逐渐提升,随着填充厚度增加逐渐提升,且远高于普通中空玻璃,进一步确认了其优异的节能效果。     

低能耗建筑用透明气凝胶节能玻璃的研究与进展

近年来,我国的建筑耗能依旧呈增长趋势,其中围护结构在建筑耗能方面的占比为20%～40%,是建筑节能的短板之一。应用先进技术及新型节能材料于围护结构设计是当前降低建筑耗能的有效方法,其中气凝胶玻璃由于具有传热系数低、透光性好、避免眩光等优点成为了研究热点。本文综述了市面上不同气凝胶种类,比较了气凝胶玻璃在严寒、酷暑等不同地区的应用情况,并对主流的颗粒气凝胶玻璃进行了对比,最后对气凝胶玻璃的发展方向及应用前景进行了展望。     

树脂透光混凝土制品的热工性能及其保温隔热效果评估

节能建筑材料是推动绿色建筑发展的重要物质基础,也是建筑节能的根本。鉴于此,根据树脂材料的透光和热工性能,设计了一种新型树脂透光混凝土制品,通过试验和有限元模拟手段计算了其平均导热系数;提出了树脂透光混凝土幕墙的概念,借助Ecotect软件对树脂透光混凝土幕墙和其他几类常见玻璃幕墙的试验室进行了热环境分析,通过对比不同幕墙的能耗评估了该树脂透光混凝土幕墙板材的保温隔热能力。结果表明:该种树脂透光混凝土制品的平均导热系数约为0.381 5 W/(m·K),树脂透光混凝土幕墙的保温隔热能力较接近双层中空Low-E非遮阳玻璃,相比单层白玻璃节约能耗接近14%,节能减耗效果显著,可推广应用于绿色节能建筑。     

二氧化硅气凝胶-石蜡玻璃窗隔热特性分析

二氧化硅气凝胶具有良好的透光保温性能,二氧化硅气凝胶-石蜡玻璃窗作为高性能建筑玻璃能有效降低建筑能耗。通过设计不同气凝胶厚度和导热系数,研究对气凝胶-石蜡玻璃窗保温隔热性能的影响。结果表明:随着二氧化硅气凝胶填充厚度的增加,玻璃窗内表面温度升高,热流密度降低。气凝胶厚度由10 mm增加到30 mm和50 mm,内表面温度分别增加33. 33%和39. 67%;热流密度分别降低26. 93%和34. 53%。当二氧化硅气凝层厚度为30 mm时,随着气凝胶导热系数增加,玻璃窗内表面温度降低,热流密度升高。     

文安建筑产业化基地绿色生态、智慧产能项目

本文系统地介绍了产能建筑方案设计,既融合了被动式超低能耗建筑设计理念,又进行了大胆的研究和创新,其中气凝胶毡材料应用于热桥处理部位及管道保温、玻璃钢窗和高隔热高透光的隔热涂料组合应用、产能建筑实践等均属于国内首次应用实践;并将海绵城市、智慧城市的理念和技术有机地与项目方案相结合。     

气凝胶材料在建筑领域的应用前景探索

气凝胶被认为是当今建筑应用最有前途的高性能隔热材料之一。与传统的隔热材料相比,气凝胶产品的导热系数低至0.013 W/（m?K）,显示出卓越的隔热特性。气凝胶具有所有固体材料中最低的折射率和介电常数,此外,它们可以作为不透明、半透明或透明的材料生产,从而在尝试利用太阳辐射的日光和太阳能时实现广泛的建筑应用。然而,要使气凝胶成为不透明应用的广泛隔热材料,必须大幅降低成本。本研究综述了气凝胶玻璃、气凝胶涂料、气凝胶增强板及其在建筑物中的应用,基于气凝胶的隔热材料在各种应用中得到了说明。     

浅析高速公路工程招投标中的最低评标价法

结合目前高速公路施工项目招投标活动的实际情况,阐述了最低评标价法的概念,归纳了其优点及存在问题,对完善最低评标价法提出几点策略,以期促进招标投标市场更加规范有序。     

Place-Making in Megaprojects in Melbourne

This article analyses state-led place-making practices in Melbourne. The two levels of government that influence planning in Melbourne make much of the city as ‘culturally vibrant’ and ‘creative’, and have incorporated creative city-inspired place-making principles into many layers of the planning system. An examination of the development of two mixed-use megaprojects in central Melbourne reveals however that ideals of culturally engaging public places, and indeed of creative landscapes for middle-class consumption, wither in the face of more basic imperatives for economic development. In these case studies the ‘creative city’, no matter how the idea is interpreted, has little traction either as a set of inclusive place-making principles or as a gentrification strategy. The article concludes that the creative city-inspired place-making objectives in the planning system at both state and local levels are ambiguous in their overall intents and completely unsupported by statutory controls. Such place-making objectives as are realised are the compromised results of the interplay of uncoordinated decisions, delivered at the pleasure of the developer.     

Pathogens in septage in Vietnam

Septage is widely acknowledged as a major source of infectious pathogens while disposal of septage, and the operation and maintenance of septic tanks, is not regulated in many developing countries. Twenty untreated septage and septage sludge samples were taken from Can Tho City, Vietnam to examine their pathogen content, and indicator micro-organisms. Escherichia coli and Enterococcus spp. were detected in all samples, regardless of sludge storage time. Phages were detected in 80% of samples. Salmonella spp. were detected in 70% of the untreated septage and 60% of septage sludge samples. Concentrations of phages and bacteria tested in septage sludge after many years of tank storage were much higher than the expected levels. Helminth ova were present in 95% of untreated septage samples with an average of 450 ova l^− 1, and were detected in all septage sludge samples with an average of 16,000 ova l^− 1. Twelve varieties of helminth ova were identified. More helminth ova varieties in higher concentrations were found in septage than those reported from stool samples. The varieties' frequency ranged from 10% to 50% and Ascaris lumbricoides predominated. Results show that pathogens and indicator micro-organisms, especially helminth ova, accumulate in sludge. Thus helminth ova should be considered when septage sludge is treated and used for agriculture. Proper health protection measures must be applied for people handling septage.     

新时期广东城市化的新特点

新时期广东城市化出现以下特点:知识源导向、城市由单体向群体化发展、产业集群推动、政府主导自上而下的集约化发展、城镇化向城市化转变、由重“数量”发展向重“质量”发展的转变。     

在市场中实践在实践中学习在学习中进步--工程公司市场化进程的回顾与展望

近两年来，工程公司在提高市场竞争意识、推动市场化进程中做了大量工作，其中坚持走出去的方针是我们自我加压、推行加快市场化步伐的一个重要战略步骤。     

新形势下高校强化基建财务管理的探讨

在市场条件下高校基建财务人员在加强日常财务管理的同时,必须树立起高度的工作责任心,抓好事前监督、事中监督、事后监督三个环节,全面理解、贯彻执行《高等学校财务制度》,管好用好各项基本建设资金,提高基建财务管理水平,更好地完成高校各项基建任务,以有限的投资,最快的建设速度,获得最大的投资效益。     

Variation in property taxation in Tulsa

Conclusions It may be reasonably concluded from this study that the range of variation in these ratios of assessed to actual value are of a reasonable size for the great majority of cases. The frequency distribution of these sample ratios was not normal, however, as was assumed a process of this type would produce. On the other hand, the failure of the regression analysis to identify any significant variables which would explain these variations would tend to re-enforce the assumption that the fluctuations were indeed of a random nature.To sum it up in one paragraph, aside from a few extreme cases, the assessing process appears to give estimates which are more consistent than would be expected under the assumption that any errors would be of a random nature, but the regression analysis was unable to isolate any particular socioeconomic characteristics which would explain the variation which was present.Financial support for this research project was furnished by the University of Tulsa.     

2008年日本火灾情况

<正>1火灾总数在2008年(1～12月),日本发生的火灾总数为52 394起,与2007年相比减少了2 188起(4.0%)。这相当于平均1天大约发生143起火灾,每10min发生一起火灾。火灾类别(见表1)。     

谈城市历史保护规划的误区

由于缺乏起码的历史文化知识,忽视历史文化遗产的保护,错误的决策导致了建设性的破坏,要加强城市保护的教育,培养合格人才。     

浅谈我国工程项目建设成本控制存在的问题

结合目前我国施工企业工程项目成本管理现状,对工程项目成本管理过程中存在的问题进行了较详细的分析,并提出了一些解决问题的办法,以做好项目成本控制工作,进而增强企业经济实力。