Performance of a 33m high geogrid reinforced soil embankment without concrete panel

Geosynthetic reinforced soil embankment are extensively applied in the construction of high-speed railway and highway in mountainous regions but limited field monitoring is conducted on high and steep cases. Aiming to acquire better understanding, a 33-m-high single-tiered wrapped-facing geogrid reinforced soil embankment with the slope of 1 V:0.5H in China was monitored for 2 years during and after construction. Vertical earth pressure, strain of geogrids, horizontal displacement and settlement per layer were recorded and analysed. The results show that the geogrid tensile strains gradually increased during construction. And they were still developing after completion due to creep and subsequent vehicle surcharge load. The predictions of reinforcement loads by the FHWA methods were much higher than the estimated ones from measured strains. The vertical earth pressures linearly grew during construction and then stabilized fast. The horizontal displacement increases with height and the largest value achieved around the top of the slope two years after the construction is 0.14% the total height approximately. The settlement per layer is larger in the lower and middle portion of the embankment and no obvious change is observed over time. This study hopes to serve as a case reference for design and construction of similar reinforcement projects in the future.     

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对液压胀形用激光焊管产品的质量控制过程进行了研究。通过在线非破坏性检测手段对余高、凹陷、错边及气孔等焊接质量缺陷进行控制,同时通过扩口试验、压扁试验、焊缝金相组织及硬度试验等质量检测方法进行了液压胀形用激光焊管产品的离线质量控制。另外,从生产供货角度出发说明了产品质量管控过程中首件检测方法的关键作用,强调了段焊检测和焊缝金相检测的重要性。试验结果表明,激光焊管的各项性能指标满足液压胀形工艺的使用要求。     

基于综合判断的高抗内部缺陷分析与处理

分析了一起1000kV线路高抗乙炔含量异常故障,阐述了故障的原因和机理,给出了针对故障采取的消除缺陷的方法,介绍了后续带电检测的情况及结果。     

Novel flame‐retardant epoxy based on zinc methylethyl phosphinate

A novel flame retardant zinc methylethylphosphinate (Zn(MEP)) was used to fill epoxy resins (EPs). The structure of Zn(MEP) was conformed with Fourier transform infrared, hydrogen nuclear magnetic resonance and phosphorus nuclear magnetic resonance, and X‐ray fluorescent and X‐ray diffraction. The flammability, decomposition behavior, and glass transition temperature (T_g) of cured EP/Zn(MEP) were investigated. Zn(MEP) is stable below 406°C. EP containing 20 phr of Zn(MEP) achieves 27.5% of limiting oxygen index and UL‐94 V0 rating. Scanning electron microscopy‐energy‐dispersive X‐ray and Fourier transform infrared spectroscopy investigations show that a condensed char layer with carbon‐rich and phosphorus‐rich components was formed during heating Zn(MEP)/EP, the atomic ratio of P to Zn on the surface of the char is reduced compared with the initial sample. The P‐rich components and lower atomic ratio of P/Zn on the char surface implies that the Zn(MEP) acts in both condensed phase and gas phase. TGA investigation shows that there are interactions between Zn(MEP) and EP when they are copyrolyzed. The interactions lead to a modification in degradation process and promote the char forming. Compared with aluminum diethylphosphinate Zn(MEP) filled EP shows lower limiting oxygen index but higher T_g. In addition, the interactions between polymer and additive are different when aluminum diethylphosphinate instead of Zn(MEP) is added into EP. Copyright © 2013 John Wiley & Sons, Ltd.     

发现·转化：基于问题驱动的城市住宅课程教学实践探索

在中国房地产快速发展背景下，“城市住宅设计”教学中容易出现重点不清，以及学生对设计素材抄袭的问题。文章针对以住宅设计原理的掌握为主的教学要求，进行了“基于问题驱动的城市住宅课程设计”的实践探索。力图通过一条“问题驱动”的设计链条，引导问题的“发现”，控制问题的 “转化”，帮助学生结合设计条件对城市住宅进行主动的思考以及有目的的设计，以促成教学目标的达成。这样的教学方法有利于学生实现设计创新，并能够开拓具有社会角度的专业视野。     

浅述新疆地区几种微灌用过滤器研究

介绍新疆地区微灌中常用过滤器的工作原理与特点,简述了过滤器与自动控制和自动冲洗的结合以及多种过滤器的联合使用。针对过滤器的发展趋势以及发展中面临的堵塞问题,指出了过滤器研究的几个方向。对于新疆农业的发展,微灌技术的发展、推广、应用、普及,以及过滤器的研究发展具有一定程度的积极作用。     

邯钢高炉喷吹煤的性能评价分析

通过对邯钢高炉常用的6种喷吹煤种分别进行了可磨性、着火温度、爆炸性、工业分析和发热值等试验研究,对比分析了各煤种的性能,评价出无烟煤和烟煤的最优原料,为生产选择适宜的混喷煤种提供数据支持。     

中国近代火车站之天津西站研究

铁路的建设与发展在中国近代史中占据着极其重要的地位,火车站房建筑也随之成为近代中国的重要公共建筑类型之一。本文的研究对象——天津西站,不仅因其独特的建设背景在当时呈现出别具一格的建筑风采,其中西融合、复杂多样的建筑设计语言更使其在百年之后仍以饱含文化韵味的建筑姿态吸引众多学者去探索、研究。文章从西站的建设背景——津浦铁路入手,通过整理分析史实资料,梳理其历史发展脉络,同时结合19世纪末20世纪初的欧洲建筑变革情况,对天津西站主楼的平立面、建筑细部设计、建筑风格、社会影响进行解析。     

Phosphorylation Stoichiometries of Human Eukaryotic Initiation Factors

Eukaryotic translation initiation factors are the principal molecular effectors regulating the process converting nucleic acid to functional protein. Commonly referred to as eIFs (eukaryotic initiation factors), this suite of proteins is comprised of at least 25 individual subunits that function in a coordinated, regulated, manner during mRNA translation. Multiple facets of eIF regulation have yet to be elucidated; however, many of the necessary protein factors are phosphorylated. Herein, we have isolated, identified and quantified phosphosites from eIF2, eIF3, and eIF4G generated from log phase grown HeLa cell lysates. Our investigation is the first study to globally quantify eIF phosphosites and illustrates differences in abundance of phosphorylation between the residues of each factor. Thus, identification of those phosphosites that exhibit either high or low levels of phosphorylation under log phase growing conditions may aid researchers to concentrate their investigative efforts to specific phosphosites that potentially harbor important regulatory mechanisms germane to mRNA translation.