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Malignant Mesothelioma Presenting as a Giant Chest, Abdominal and Pelvic Wall Mass
Zhi-hong Shao,Xiao-long Gao,Xiang-hua Yi,Pei-jun Wang 대한영상의학회 2011 Korean Journal of Radiology Vol.12 No.6
Malignant mesothelioma (MM) is a relatively rare carcinoma of the mesothelial cells, and it is usually located in the pleural or peritoneal cavity. Here we report on a unique case of MM that developed in the chest, abdominal and pelvic walls in a 77-year-old female patient. CT and MRI revealed mesothelioma that manifested as a giant mass in the right flank and bilateral pelvic walls. The diagnosis was confirmed by the pathology and immunohistochemistry. Though rare, accurate investigation of the radiological features of a body wall MM may help make an exact diagnosis.
Li, Xiang Yuan,Shao, Xing Long,Wang, Yi Chuan,Jiang, Hao,Hwang, Cheol Seong,Zhao, Jin Shi Royal Society of Chemistry 2017 Nanoscale Vol.9 No.6
<P>Ta2O5 has been an appealing contender for the resistance switching random access memory (ReRAM). The resistance switching (RS) in this material is induced by the repeated formation and rupture of the conducting filaments (CFs) in the oxide layer, which are accompanied by the almost inevitable randomness of the switching parameters. In this work, a 1 to 2 nm-thick Ti layer was deposited on the 10 nm-thick Ta2O5 RS layer, which greatly improved the RS performances, including the much-improved switching uniformity. The Ti metal layer was naturally oxidized to TiOx (x < 2) and played the role of a series resistor, whose resistance value was comparable to the on-state resistance of the Ta2O5 RS layer. The series resistor TiOx efficiently suppressed the adverse effects of the voltage (or current) overshooting at the moment of switching by the appropriate voltage partake effect, which increased the controllability of the CF formation and rupture. The switching cycle endurance was increased by two orders of magnitude even during the severe current-voltage sweep tests compared with the samples without the thin TiOx layer. The Ti deposition did not induce any significant overhead to the fabrication process, making the process highly promising for the mass production of a reliable ReRAM.</P>
Analysis of Pressure Distribution of the Bolted Joints Based on the Finite Element Method
Sheng-ao Wang,Min Zhu,Fei Wu,Tian-xi Liang,Zhao-qun Shao,Yi-long Liu 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.2
Bolted joints widely exist in the field of the national defense industry. However, its nonlinear stiffness degradation will occur under tangential load which may lead to the reliability reduction. According to Coulomb friction theory, the pressure distribution is the key in the tangential degradation of bolted joints. Therefore, this paper aims to analyze the pressure distribution of bolted joints. Firstly, we established a threaded bolt model and two simplified models. Secondly, the accuracy of the three models describing the contact area is verified, and the influence of preload and material properties on the contact radius is analyzed. Thirdly, we compared the pressure distribution of the three models, and results show that the smooth bolt model is more suitable for pressure analysis. Finally, the accuracy of several different functions to characterize the pressure distribution of bolted joints is analyzed, and results indicated that the Fernlund function is optimal. This paper provides a feasible simplified bolt model for finite element analysis, and the optimal pressure distribution function can be applied in the tangential stiffness degradation modeling.