不同构造措施的钢管混凝土边框钢板剪力墙抗震性能试验研究

钢管混凝土边框钢板剪力墙是一种新型抗震剪力墙,为了比较不同构造措施对该新型剪力墙抗震性能的影响,进行了3个剪跨比为1.5的钢管混凝土边框钢板剪力墙低周反复荷载试验.其中,试验模型1为墙体钢板与边框柱钢管焊接,试验模型2为墙体钢板与边框柱钢管螺栓连接,试验模型3为墙体钢板开孔并与边框柱钢管焊接.通过试验研究,比较了各剪力...     

Effect of Recycling on Material Properties of Glass-filled Polyethylene Terephthalate

Recycled plastics are considered low performance materials because their properties are expected to decrease drastically with recycling. The objective of this study was to characterize a 15 wt.% glass filled polyethylene terephthalate (rPET-15GF) using six recycle generations and four recycle ratios. Mechanical properties such as tensile strength, elastic modulus, and percent elongation to failure of the PET composite were determined for various recycle generations and recycle ratios. Results show that the mechanical properties of rPET-15GF decrease slightly per recycle generation. In contrast, thermal properties of rPET-15GF were not at all affected by the recycling process. This data demonstrates that recycled glass filled PET can be used effectively to fabricate components without significantly affecting their mechanical performance.     

高填方路基诱发滑坡机理分析

通过对上三高速公路K92滑坡工程地质条件、滑坡特征及滑坡稳定性的分析，采用不分离接触数值模型模拟边坡的变形破坏，初步揭示了松散覆盖土层上厚度较大的高填方路基是诱发滑坡的内在机理。该类型滑坡的产生是由于路基堆载使坡体产生垂直方向的压缩变形，也使坡体向坡脚方向产生一定的挤出变形，最后诱发了推动式滑坡。     

油池火作用下钢管混凝土柱温度分布研究

在开敞空间条件下利用油池火模拟不同的火灾场景,对火源燃烧阶段和燃烧结束后钢管混凝土柱的温度变化进行研究。测量了燃料质量变化和钢管混凝土柱的温度分布等参数,分析不同火灾场景下钢管混凝土柱轴向、横截面的温度变化,并以实验工况HS3为例进行深入分析,同时分析了火源的燃烧时间、热释放速率对钢管混凝土柱温度场分布的影响。研究结果表明,钢管混凝土柱纵向温度分布与横向温度分布一样都存在明显的温度梯度,其表面钢管温度变化受火场热释放速率影响较大,而内部混凝土的温度变化则主要受火场持续时间的影响。     

Optimization of the recovery of plastics for recycling by density media separation cyclones

Material recovery processes are presented as the optimum option for recycling plastic wastes as a means of recovering hydrocarbon resources. There exist a large variety of automated material recovery processes for recycling of such wastes but each with significant limitations. Of these, the separation based on differences in densities is advocated as the optimum process either for producing recycled products or preparing wastes for subsequent recovery processing.Density separation processes based on cyclone type density media separation (DMS) is presented as an important, potential method for increasing plastics recycling process capacities. It is demonstrated to have the capacity to separate a significantly larger range of particle sizes than those presently processed industrially. The mathematical relationship for the prediction of quality of typical LARCODEMS type density media separations by particle size and density as expressed by the Ecart Probable is presented.A proposed device configuration is presented for density media separation to optimize the recovery and purity of both density fractions produced. It is also suggested that to be economically viable, a large scale of operation is required for industrial plastics recycling operations recovering and producing a number of different plastics with a purity to be used as a substitute for virgin material.     

古鄱阳湖中生代盆地充填序列和演化特征

古鄱阳湖中生代盆地的研究表明，该盆地并不是简单的白垩纪盆地，而是历经多次构造旋回的复杂盆地。盆地多次成生、萎缩、上升，均是燕山运动的结果。     

油气管道盗孔补板修复结构强度分析

运用非线性有限元计算方法,对管道补板结构在内压载荷作用下的应力状态进行分析,研究管道补板修复结构的承压薄弱点与最优修复尺寸。研究结果表明,补板结构导致管道开孔附近区域内应力分布不均匀,出现局部应力集中现象;补板结构的危险区为补板与管体交界处45°~90°局部范围;与管道壁厚相近的补板壁厚和3倍孔径的补板长度具有更佳的修复效果。     

钢管混凝土柱耐火性能和抗火设计的特点

简要论述了按ISO－834和GS9978－88规定的标准升温曲线升温作用下钢管混凝土柱耐火性能的特点,分析了影响钢管混凝土柱耐火极限的因素,说明了由于钢管和混凝土的共同工作且核心混凝土具有较好的吸热性能,从而使钢管混凝土柱具有较好的耐火性能。在进行钢管钢混凝土柱的抗火设计时,柱子外围只需进行适当的防火涂料保护,即可达到《高层用民建筑设计防火规范（GB50045－95）》对柱结构所要求的耐火极限。《高层用民建筑设计防火规范（GB50045－95）》中对钢结构柱防火保护层厚度的确定方法不适合于钢管混凝土。     

Spatially Disaggregated Inventories of Soil NO and N2O Emissions for Great Britain

Estimates of soil N₂O and NOemissions at regional and country scales arehighly uncertain, because the most widely usedmethodologies are based on few data, they do notinclude all sources and do not account forspatial and seasonal variability. To improveunderstanding of the spatial distribution of soilNO and N₂O emissions we have developedsimple multi-linear regression models based onpublished field studies from temperate climates.The models were applied to create spatialinventories at the 5 km² scale of soil NOand N₂O emissions for Great Britain. The N₂O regression model described soilN₂O emissions as a function of soil N input,soil water content, soil temperature and land useand provided an annual N₂O emission of 128 kt N₂O-N yr^-1. Emission rates largerthan 12 kg N₂O-N ha^-1 yr^-1 werecalculated for the high rainfall grassland areasin the west of Great Britain.Soil NO emissions were calculated using tworegression models, which described NO emissionsas a function of soil N input with and without afunction for the water filled pore space. Thetotal annual emissions from both methods, 66 and7 kt NO-N yr^-1, respectively, span the rangeof previous estimates for Great Britain.     

一起高压充氮车燃爆事故

对某机场制氧制氮站发生的一起充氮拖车上的高压氮气瓶燃爆事故进行分析,找出了事故的原因,提出了几点建议。