《硅酮结构胶装配现场评估标准指南》的介绍

硅酮结构胶装配(SSG)是现在比较流行的幕墙装配形式之一,也是既有幕墙的现场评估的重要组成部分.ASTMC1394-03提出了一种周期性的现场评估SSG现状的方案,并给出了不同级别评估的程序.了解该标准,借鉴美国的评估程序,对于我国研究既有幕墙的现场检测评估是很有意义的.本文给出了该规范的译文--<硅酮结构胶装配现场评估标准指南>.     

实施GB24266标准有损于建筑幕墙安全——对《中空玻璃用硅酮结构密封胶》标准的技术质疑

GB24266的适用性区别于采标确定的对应标准,以高模量抵抗结构变形利于防水密封为由,规定结构胶拉伸10％的模量大于0．14MPa,忽视约束变形产生高应力的危害,不能与建筑规范承载能力极限状态设计原则相协调。中空玻璃边部三面粘结对位移的效应是更高应力和过早破坏,标准不设模量指标上限,也不报告模量,幕墙粘结设计无法按规范验算和选材,高性能结构胶应用受限,弹性差、质地刚硬产品的应用不受约束,粘结结构处于高应力状态将增大中空玻璃外片脱粘坠落伤人毁物的危险。     

粉煤灰、烧结或天然的火山灰作为混凝土矿物掺合料的标准(ASTM C618-00)

1 范围1.1 本标准适用于用作为混凝土矿物掺合料的粉煤灰、天然火山灰原灰或烧结的天然火山灰,这些物料在混凝土中具有胶凝性或火山灰反应,或二者均有。该标准还包括其它的粉末状矿物料,这些物料在混凝土中具有胶凝性或火山灰反应,或二者均有。     

JC/T 173-2005《玻璃纤维防虫网布》标准介绍

本文介绍了JC/T 173-2005<玻璃纤维防虫网布>标准,对其主要技术内容进行阐述,并和相关标准进行对比,希望该标准的制定,能够提高产品水平,促进行业进步.     

《农药标准应用指南(2008)》出版发行

为提高农药管理水平,加强农药标准化建设,让广大农药工作者及时了解和掌握农药国家标准和行业标准信息,农业部农药检定所组织编写了     

GB/T 12957-2005《用作水泥混合材料的工业废渣活性试验方法》标准介绍

0引言,用于水泥混合材料的工业废渣活性，对水泥及混凝土性能有很大影响，因而工业废渣活性评定试验方法对水泥的生产和使用至关重要。目前国际上评定用于水泥中的工业废渣活性尚无统一检测方法，当前英、法等国均采用国际标准ISO863：1990（E）《用于火山灰质水泥的火山灰活性试验方法》，而德国采用DIN51043—79《凝灰岩检验要求》，美国和日本则采用28d抗压强度活性指数评定工业废渣活性，且目前日本标准JISA6201：1999《用于混凝土中的粉煤灰》中水泥强度试验方法已改用国际标准ISO679：1989。     

JC/T 590-2005《过滤用玻璃纤维针刺毡》行业标准的介绍

本文描述了<过滤用玻璃纤维针刺毡>行业标准的修订过程和标准报批稿的主要内容.     

《承压设备无损检测》(JB/T4730-2005)标准执行中容易忽视的几个问题

笔者由于工作原因,经常用到《承压设备无损检测》(JB/T4730-2005)这一国内承压设备无损检测综合性标准,对于标准的有些条款,感觉实际应用中往往会忽视。在此指出,以求引起同行的注意和重视,以免造成工作失误。     

新国标《玻璃工业大气污染物排放标准(征求意见稿)》对平板玻璃行业的影响

介绍了我国平板玻璃工业大气污染排放现状.通过对新国标《玻璃工业大气污染物排放标准(征求意见稿)》与GB 26453—2011《平板玻璃工业大气污染物排放标准》主要控制指标的对比,分析新标准的全面实施将对现有平板玻璃生产企业生存状态的影响,提出了平板玻璃生产企业污染物控制及治理的方法.     

《硫酸工业污染物排放标准》(GB26132-2010)正式颁布

近日,国家环保部正式颁布了《硫酸工业污染物排放标准》(GB26132—2010)。该标准于2010年12月31日发布,自2011年3月1日起实施。自该标准实施之日起,硫酸工业企业水和大气污染物排放控制按该标准的规定执行,不再执行《污水综合排放     

我国有机硅结构密封胶发展现状与展望

介绍了玻璃幕墙的特点及有机硅结构密封胶的功能、发展历史与最新进展,对国内外几种典型的有机硅结构密封胶性能进行了分析比较,对有机硅结构密封胶的前景进行了展望并提出了发展建议。     

Structural silicone sealant modelling for wood frames: influence of adhesion on bonding strength

This paper provides a quantitative measure of the bonding strength of structural silicone sealant applied to wood–double glazing glass joints for wood frame applications. The joint strength is assessed by tensile and shear experimental tests. The paper aims to characterize the joint behaviour through experimental tests in order to implement and validate a finite element (FE) model of the joint that can be used for whole frame characterization. The experimental tests are carried out on three wood species (Meranti, White Oak and Pine), and two different FE models of the wood–silicone–glass joint are implemented: the first basic model assumes the modulus of elasticity and modulus of rupture of the silicone as provided by the manufacturer, while the second model assumes the results of the experimental tensile tests. The results of the first FE model do not fit well with the tests carried out, while the second FE model proves to be more reliable and is validated by experimental results. The results report that, when modelling wood–double glazing glass joints by FE methods, the equivalent structural sealant modulus of elasticity assigned in the model should be about 50% lower than what is declared by the manufacturer. This result can be useful when modelling whole wood frames and dimensioning sealant depth and thickness in wood–glass joint applications.     

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.     

Remarks on “Discussion of three models used for the investigation of insertion/extraction processes by the potential step chronoamperometry technique” [C. Montella, Electrochim. Acta 50 (2005) 3746-3763]

The cell-impedance-controlled concept to explain the chronoamperometric curves obtained from intercalation compounds is revisited and inspired by the recent publication entitled “Discussion of three models used for the investigation of insertion/extraction processes by the potential step chronoamperometry technique” [C. Montella, Electrochim. Acta 50 (2005) 3746-3763]. The main issues the author pointed out have been critically discussed and then, the validity of the cell-impedance-controlled model has been verified from the combination of experimental and theoretical approaches.