Study of factors that influence geomembrane air expansion deformation under ring-restrained conditions

In studies on the geomembrane air expansion in plain reservoirs, the forced deformation of a geomembrane is generally simplified as geomembrane air expansion deformation under ring-restrained conditions. In this study, a test apparatus was developed to measure geomembrane air expansion deformation, and a number of factors that can affect geomembrane air expansion deformation were investigated, including the test apparatus diameter, loading rate, and geomembrane defects. The results of this study show that under ring-restrained conditions, as the test apparatus diameter increases, the burst pressure decreases, and the burst crown height increases. Moreover, the burst pressure and the burst crown height gradually increase as the loading rate increases. Geomembrane defects, such as holes, folds, and scratches, decrease both the burst pressure and the burst crown height.     

映秀湾电站水轮机转轮沙水流动数值模拟

为了研究映秀湾水电站水轮机内部沙水流动特性,对水轮机进行沙水流动数值模拟,分析水轮机转轮部分沙水流动情况。研究结果表明,转轮内叶片进水边及出水边靠下环处是泥沙分布的主要区域。研究结果对水轮机泥沙磨损的研究具有指导意义。     

动态土工真三轴仪在砂土液化研究中的应用

为了模拟实际场地中土体变形和强度特性,研究开发了揭示侧限条件下饱和砂土震动液化机理的试验方法。文中采用了动态真三轴试验系统,该设备采用刚性板加柔性面的混合边界加载装置,并应用先进的CATS试验控制系统。试验结果表明应用动态土工真三轴仪进行砂土液化实验是可行的,并初步分析了侧限条件下的液化机理,即土体将在轴向压力、侧压和孔隙水压力相等的条件下发生液化,表明振动荷载过程中的应力重分布对砂土液化强度和孔隙水压力发展等具有显著的影响。     

混凝土流变参数十字搅拌轴测试方法

采用十字搅拌轴剪切仪测定混凝土拌和物的流变参数（屈服应力τ0和塑性黏度η）更具准确性.通过推导给出了自制十字轴流变仪扭矩与转速关系,得出了流变参数计算公式;试验所得混凝土拌和物流变参数与已有相关理论和试验具有良好的一致性,并能量化分析混凝土触变性能,可满足施工现场连续测定混凝土工作性需求.     

人工髋关节股骨柄专用型疲劳测试装置研制

疲劳性能是人工关节等外科植入物可靠性的关键指标。针对人工髋关节疲劳性能测试问题,开发了专用型人工关节疲劳测试装置,基于装置,根据ISO7206标准,针对人工股骨柄产品进行了体外疲劳试验,并通过三坐标仪对试样进行变形测量与三维重构;此外,对试样中人工股骨柄进行有限元计算,模拟结果与试验所得变形量相吻合;经500万次循环疲劳试验后,该装置运行平稳、无异常,达到设计可靠性标准,能够有效进行人工髋关节疲劳标准测试与评估。     

A Novel Feature Extraction Method with Feature Selection to Identify Golgi-Resident Protein Types from Imbalanced Data

The Golgi Apparatus (GA) is a major collection and dispatch station for numerous proteins destined for secretion, plasma membranes and lysosomes. The dysfunction of GA proteins can result in neurodegenerative diseases. Therefore, accurate identification of protein subGolgi localizations may assist in drug development and understanding the mechanisms of the GA involved in various cellular processes. In this paper, a new computational method is proposed for identifying cis-Golgi proteins from trans-Golgi proteins. Based on the concept of Common Spatial Patterns (CSP), a novel feature extraction technique is developed to extract evolutionary information from protein sequences. To deal with the imbalanced benchmark dataset, the Synthetic Minority Over-sampling Technique (SMOTE) is adopted. A feature selection method called Random Forest-Recursive Feature Elimination (RF-RFE) is employed to search the optimal features from the CSP based features and g-gap dipeptide composition. Based on the optimal features, a Random Forest (RF) module is used to distinguish cis-Golgi proteins from trans-Golgi proteins. Through the jackknife cross-validation, the proposed method achieves a promising performance with a sensitivity of 0.889, a specificity of 0.880, an accuracy of 0.885, and a Matthew’s Correlation Coefficient (MCC) of 0.765, which remarkably outperforms previous methods. Moreover, when tested on a common independent dataset, our method also achieves a significantly improved performance. These results highlight the promising performance of the proposed method to identify Golgi-resident protein types. Furthermore, the CSP based feature extraction method may provide guidelines for protein function predictions.     

复杂电感电路在不同频率特性下本质安全性研究的技术实现

为了探讨不同频率特性下复杂电感电路的本质安全性,利用信号发生器产生不同频率的信号,经功率放大、调压后,作为实验电路的电源,设计出新的实验电路。该电路是研究不同频率特性下复杂电感电路本质安全性的技术基础。     

刍议综采设备对发展高产高效矿井的意义

通过对国内外综采技术发展状况的对比以及对实例的分析,充分论证了综采设备对发展高产高效矿井的意义,并对综采设备的发展提出了一些建议.     

刮板输送机便携式工况测试仪的研究

介绍了便携式刮板输送机工况测试仪的主要研究内容,简要说明了其设计思路、工作原理以及在国家级煤矿掘进机械质量监督检测中心的电机试验台上和便携式刮板输送机工况测试仪进行的对比试验情况。