2010年河南省大田小麦品质状况研究

通过对2010年收获的81份小麦样品进行检测,结果表明,小麦容重平均为（793.6±17.21）g/L,籽粒蛋白质平均含量为（15.06±0.83）%,湿面筋含量为（31.78±2.33）%,面筋指数为（255.4±105.26）%,降落数值为（255.4±105.26）s,面团稳定时间为（6.52±5.82）min,拉伸面积为（74.3±32.56）cm2。其中,91.35%的小麦样品籽粒蛋白质含量在14.0%以上,50.62%小麦样品湿面筋含量在32.0%以上,20.99%小麦样品的面团稳定时间在7.0 min以上,44.44%的小麦样品降落数值在300 s以上,达到优质小麦-强筋小麦品质标准（GB/T 17892—1999）的规定。     

国产CCF300碳纤维单向织物液体成型工艺性及其复合材料力学性能

选取国产碳纤维CCF300所制备的2种单向织物,单向无纬织物U3160及单向无屈曲织物KUC160,分别对其预成型体进行压缩特性和渗透特性测试,以研究2种单向织物的液体成型工艺性,并采用树脂传递模塑(RTM)工艺制备2种单向织物/双马来酰亚胺树脂基复合材料,测试并对比其面内力学性能。结果表明:预成型体压缩试验中,嵌套效应受压力及织物层数影响较大,压力越高、层数越多,嵌套效应越显著。U3160织物的嵌套效应较KUC160织物更为明显,在较高压力下,KUC160织物预成型体的纤维体积分数较U3160织物的下降了约20%。渗透率测试结果表明:相比U3160织物,KUC160织物0°方向的渗透率较高,而90°方向的渗透率有所降低;这是由于经编线的绑缚作用能促进0°方向的宏观流动,而阻碍90°方向的微观渗透。此外,KUC160织物的经编线与U3160织物的纬向纱线的导流作用也对渗透率有影响。力学性能试验结果表明:相比U3160织物增强复合材料,KUC160织物增强复合材料0°方向的拉伸、弯曲和压缩性能均有所下降,拉伸强度和弯曲模量降幅最大,分别约为11%和21%;而层间剪切强度有小幅提高,增幅约为8%。      

航空自润滑关节轴承寿命试验机的构型

依据关节轴承摆动及磨损形式,建立了关节轴承运动特征矩阵。根据关节轴承运动形式和承载特点,引出了关节轴承寿命试验机49种理论构型;同时将现有寿命试验机归纳为4种构型,并对每种构型典型的寿命试验机进行了分析。最后根据实际工况条件,提出两种有使用价值的寿命试验机构型,并对这两种寿命试验机进行了方案设计。     

基于芳纶平纹织物微观几何结构的纱线抽拔力学性能分析

为研究芳纶平纹织物纱线抽拔力学性能及各参数的影响规律,建立纱线抽拔数学模型,为后续数值模型提供理论基础.采用数字单元法模拟芳纶平纹织物织造过程,获得其微观几何模型,并计算得出纱线轮廓.在此基础上,使用ABAQUS模拟单纱抽拔过程,建立纱线厚度方向单层网格划分准则和纱线材料属性,获得横向预紧力、纱线间摩擦因数对纱线抽拔力...     

Effects of human activities and urbanization on groundwater environments: an example from the aquifer system of Tokyo and the surrounding area

The Kanto plain that is the largest depositional plain in Japan has the largest urbanized area called Tokyo Metropolitan Area. This plain has experienced extensive groundwater withdrawals for water resources and human induced disasters such as land subsidence in the process of urbanization. Japanese national government and local governments have monitored groundwater levels and settlement of ground surface for about half a century. These data are useful not only for the prevention of these disasters but for the evaluation of the change of groundwater flow beneath the urbanized area. However, few hydrological and hydrogeological studies about the change of groundwater flow in this plain have been conducted until now except for several studies which were limited in areal extent. In this paper, changes of the distribution of hydraulic heads in the central part of this plain are discussed using the long-term groundwater level observation data to evaluate the change of groundwater flow. The temporal changes in the distribution of hydraulic heads in a major confined aquifer (the second aquifer) and the areal extent of the urbanized area for approximately 50 years can be summarized as follows. In the latter half of the 1950s, urban area was limited in the southern region of the study area and hydraulic head gradually declined from the northwest to the southeast in the study area. After the 1960s, urban area extended toward the north and groundwater in the northern part was largely abstracted until the 1980s. As a result, hydraulic heads in this area markedly declined. On the other hand, hydraulic heads in the southern part began to rise because of the restriction of groundwater withdrawals. In recent years, low hydraulic head area has been formed from the northern region to the central region. These results suggest that the groundwater flow which was affected by urbanization (groundwater withdrawals) has continued to change over several decades, even after the regulation of withdrawals, and hence, the continued monitoring of the groundwater environment is important for the sustainable use of groundwater resources.     

上海泻湖沼泽平原地区工程勘察的几点认识

本文结合工程实践,简要介绍了泻湖沼泽平原地区浅部土层的物理力学特性及该地区利用静力触探试验资料确定单桩竖向承载力的估算方法,并对在该地区进行岩土工程勘察过程中可能遇到的有关工程地质问题作出合理建议。     

高层住宅素混凝土桩复合地基设计

基底下局部土层不满足承载力要求,可采用素混凝土灌注桩作为增强体,形成素混凝土桩和土层共同受力的复合地基,从而提高土层承载力。通过分析比较,施工工期和造价具有较大的优势。     

平原地区城市常见地质灾害及其危险性评估

介绍了平原地区典型的地质灾害,包括地震灾害、地面沉降、岩溶塌陷、地裂缝等,结合具体实例分析了当前平原地区城市常见地质灾害及其产生的原因,探讨了其风险性评估的方法,为增强城市综合防灾减灾的能力提供了资料。     

变形速率对普碳钢中形变诱导铁素体相变的影响

针对普通碳素钢(Q235类型),研究在Ae3～Ar3温度区间内采用形变诱导铁素体机制获得超细晶铁素体的数量与变形速率的相互关系。实验在Gleeble 1500热模拟实验机上进行。实验方案为：1000℃保温2min,以10℃／s的速度冷却到变形温度[Ae3(840℃)至Ar3(780℃)],变形量为30％～50％,变形后立即水淬。结果表明,在840℃变形时,随着变形速率的增大,形变诱导铁素体量增多;在780℃变形时,随着变形速率的增大,形变诱导铁素体量减少;而在840-780℃之间变形时,变形速率存在最佳值,在该值下诱导生成的铁素体量最大。     

关节轴承密封槽及密封圈的设计改进

通过对关节轴承密封圈结构、材质性能及密封槽结构的分析,提出了一种新型的密封槽和密封圈结构,经实验和实际使用验证,改进后的密封装置密封性能良好,不易产生压装不到位、脱落及变形等缺陷。