前轮毂旋转弯曲疲劳断裂分析

采用化学分析，金相检验，力学性能测试及扫描电镜分析方法对轿车前轮毂早期断裂原因进行了分析。结果表明，冷却不足使组织中出现网状及小块状铁素体，导致硬度偏低，加之磨削加工痕迹较粗是引起前轮毂早期断裂的原因。     

Φ90mm圆盘延伸机前卡钢分析

探讨了造成Φ90mm圆盘延伸机前卡钢的原因,分析了轧件轧制过程中的第一、第二次咬入的受力情况,提出了预防前卡钢的措施。该措施实施后,基本消除了前卡钢现象。     

前置酸加砂压裂新工艺试验研究及现场应用

通过整合酸压和加砂压裂技术优势，集成为前置酸加砂压裂工艺技术。该工艺技术主要通过酸液溶蚀提高储层渗透性、抑制粘土矿物膨胀、溶解压裂液滤饼及残胶、酸压缝内填充支撑剂提高导流能力等4个方面的作用来提高改造效果。结合不同试验区储层特征，优选了酸液体系，创造性地形成了与长庆低渗透储层特点相适应的前置酸加砂压裂工艺技术，在镇53等5个区块共计试验百余口，取得了较好试验效果，为长庆低渗油田的改造提供了一项新技术措施。     

多功能USB 2.0集线器的设计与实现

在许多数码产品应用中,存在计算机USB接口不足,使用各种数码卡时需配备专用读卡器的问题。为解决这些问题,本文使用FE1.1S和AU6437芯片设计一种多功能USB集线器,可提供一个SD卡和Micro SD卡接口,以及两个标准USB 2.0扩展口。经测试,本设计硬件功能完善,性能稳定,符合USB 2.0标准,为多功能高速读卡器的设计提供了良好的技术参考和依据。     

考虑客户画像和能量枢纽的配电网多目标抢修重构模型

随着大规模风电以及能量枢纽接入配电网,配电网故障后抢修重构面临新挑战,提出一种考虑客户画像和能量枢纽的配电网多目标多故障抢修重构模型。通过对配电网用电客户多因素精准画像,确定权重,建立兼顾客户画像和能量枢纽的配电网多目标抢修重构模型,提出一种改进NSGA-II算法以适应对模型求解,从而获得Pareto解集,并利用模糊最大满意度进行决策。算例仿真表明所提模型正确有效,与传统模型相比更加精细而客观。     

EVAPORATION FROM POROUS MEDIA: A CAPILLARY MODEL OF A PENETRATING FRONT

A capillary tube model was solved to investigate the influence of mass transfer coefficient, temperature, and front depth on the evaporation rate during the penetrating-front period of water-filled porous media dried in hot air. The results show that increasing the flow rate of the drying air is not so efficient as increasing the sample temperature. Due to attenuating diffusion rate, the rate of liquid front migration decreases with time. The calculations explain the falling rate period behavior of sandstone heated at 121°C. Trends depicted by the model may be useful for the design of heating conditions for drying processes.     

压电式胎压报警器供电装置的发电特性

提出利用压电发电装置替代电池为胎压报警器提供实时电能。根据胎压报警器结构特点,提出将压电发电装置安装在车轮轮毂上,利用车轮转动中的振动来发电的方案。通过试验的方法研究了压电振子在轮毂上不同安装方式下的发电特性。试验结果表明,在既垂直于轮毂又垂直于车轮滚动方向的安装方式下,压电振子可以有效克服离心力的影响并吸收来自车轮所在平面多个方向的振动,压电发电装置发电效果较佳,适合为胎压报警器供电。利用4片45mm×15mm×0.2mm的悬臂梁型压电振子并联为胎压报警器供电,其产生的能量能够满足胎压报警器的工作要求。     

Sediment storage and shallow groundwater response to beaver dam analogues in the Colorado Front Range,USA

Enthusiasm for using beaver dam analogues (BDAs) to restore incised channels and riparian corridors has been increasing. BDAs are expected to create a similar channel response to natural beaver dams by causing channel bed aggradation and overbank flow, which subsequently raise water tables and support vegetation growth. However, lack of funding for monitoring projects post‐restoration has limited research on whether BDAs actually cause expected channel change in the Front Range and elsewhere. Geomorphic and hydrologic response to BDAs was monitored in two watersheds 1 year post‐restoration. BDAs were studied at Fish Creek, a steep mountainous catchment, and Campbell Creek, a lower gradient piedmont catchment from May to October 2018. At each restoration site, the upstream‐ and downstream‐most BDAs were chosen for intensive study in comparison with unrestored reference reaches. Monitoring focused on quantifying sediment volumes in BDA ponds and recording changes to stream stage and riparian groundwater. Despite differences in physical basin characteristics, BDA pools at both sites stored similar volumes of sediment and stored more sediment than reference pools. Sediment storage is positively correlated to BDA height and pool surface area. However, BDAs did not have a significant influence on shallow groundwater. The lack of groundwater response proximal to BDAs could indicate that local watershed factors have a stronger influence on groundwater response than restoration design 1 year post‐restoration. Systematic, long‐term studies of channel and floodplain response to BDAs are needed to better understand how BDAs will influence geomorphology and hydrology.     

基于元胞自动机的交通枢纽内人群疏散效率研究

利用元胞自动机仿真不同出口位置和不同内部布局下交通枢纽内人员的疏散情况,通过制定合适的人员行走规则,对交通枢纽内人员疏散进行仿真分析。结果表明,正面中央开口时人员的疏散效率最高,此时由于人员相对于出口大概呈对称分布,人员对过道的利用率达到最高;和正面边缘开口相比,出口位置设置在侧面更好,以减少行人在行走过程中方向的变化从而减少疏散时间。当在侧面开口时,在靠近出口墙壁处设置过道可以提高人群的疏散效率,并且适当地增加过道数目,可以对疏散人群起到分流的作用,从而对人群的疏散也很有利。     

创新统战维度的高校马克思主义信仰教育调研论析

为不断提升高校统战对象马克思主义信仰教育与思想政治教育工作水平与效果,对部分高校统战对象马克思主义信仰教育情况进行了调查,分析了当前高校统战对象马克思主义信仰教育存在的问题,提出了相应对策.