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Effects of Welding Speed and Post-weld Hot Rolling on Microstructure and Mechanical Properties of Friction Stir-Welded AZ31 Magnesium Alloy

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Acta Metallurgica Sinica(English Letters) 2018年第8期31卷 853-864页

作者： Gang Liu Li-Na Ma Zhen-Duo Ma Xue-Song Fu Guo-Bing Wei Yan Yang Tian-Cai Xu Wei-dong xie Xiao-dong Peng College of Materials Science and Engineering Chongqing UniversityChongqing 400044China National Engineering Research Center for Magnesium Alloys Chongqing 400044China

The as-rolled AZ31 Mg alloy sheets are welded by friction stir welding（FSW） in this study, followed by annealing and hot rolling with different reductions. The effects of welding speed and the rolling reduction on the microstructure, tensile properties, microhardness and fracture surfaces of the specimens are investigated. The results show that the microstructures of the FSW joint in different regions become more and more consistent as the hot rolling reduction increases. The mechanical properties of the FSW joints and the joint coefficient are improved with increasing rolling reduction; however,the hardness value in the stirred zone decreases firstly and then increases. When the rolling reduction is 50%, the tensile strength of FSW joint is close to that of base metal. The sample L_3 achieves the best comprehensive properties, with the yield strength, ultimate tensile strength and elongation of 162, 287.9 MPa, and 17.9%, respectively.

关键词： Magnesium alloy FSW Post-weld hot rolling Microstructure Mechanical properties

Multilayer polyethylene separator with enhanced thermal properties for safe lithium-ion batteries Author links open overlay panel

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Particuology 2024年第8期91卷 29-37页

作者： Ying Jiang Chen Sun Feilong dong Haiming xie Liqun Sun National&Local United Engineering Laboratory for Power Battery Department of ChemistryNortheast Normal UniversityChangchun130024China

The separator plays an important part in battery safety and *** separators are widely used in commercial Lithium-ion batteries(LIBs),owing to their excellent properties,but they suffer from serious thermal shrinkage and poor electrolyte ***,a multilayer separator(ASPESA)is developed by coating two thin layers of low-density polyethylene(LDPE)and Al_(2)O_(3)on both sides of a polyethylene membrane using a facile and environmentally friendly casting *** ASPESA separator demonstrates a shutdown function at 120℃and shows enhanced thermal stability under 185℃,with a small thermal shrinkage of 1%.Meanwhile,the LDPE and Al_(2)O_(3)layers can improve the electrolyte wettability and electrolyte uptake(407.23%).The multilayer ASPESA separator delivers an excellent cycle performance in LiFePO_(4)||Li cells with a discharge capacity of 144.5 mAh g^(-1)after 900 cycles,with a high-capacity retention of 98.9%(compared to the 5th cycle).Therefore,the multilayer ASPESA separator has great utilization potential as a high-safety separator in LIBs.

关键词： Low-density polyethylene microspheres Al_(2)O_(3)particles Thermal shutdown High safety Lithium-ionbatteries

基于流溪河模型的任河流域城口段暴雨洪水模拟

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水电能源科学 2024年第3期42卷 15-19页

作者：谢向东林孝松李宏伟张吉祥涂荣誉程宏莉重庆交通大学智慧城市学院重庆400074 重庆交通大学建筑与城市规划学院重庆400074 重庆市城口县气象局重庆405900 重庆市云阳县气象局重庆404500

为准确、有效地预报任河流域城口段暴雨洪水,以DEM、土地利用和土壤类型数据为基础,利用流溪河模型构建任河流域3级河道模型,选取20190627暴雨洪水手动优选模型参数,借助20170923、20180919暴雨洪水验证模型适用性;考虑降雨移动方向,利... 详细信息

为准确、有效地预报任河流域城口段暴雨洪水,以DEM、土地利用和土壤类型数据为基础,利用流溪河模型构建任河流域3级河道模型,选取20190627暴雨洪水手动优选模型参数,借助20170923、20180919暴雨洪水验证模型适用性;考虑降雨移动方向,利用优选模型模拟12 h降雨量为30、60、90、120、150 mm等5种情景洪水流量,分析各情景模拟特征。结果表明,参数优选后,20190627暴雨洪水洪峰误差减至2.79%,峰现时间提前5 h,模型模拟效果显著提升。20170923、20180919两次暴雨洪水洪峰误差小于20%、峰现误差小于3 h,满足模拟精度要求,流溪河模型可用于研究区暴雨洪水模拟。多情景下,30、60 mm降雨洪峰流量均小于150 m3/s;从90 mm降雨开始,洪峰流量急剧增加,增长率高达94.17%;降雨由上游往下游移动时洪水曲线至少出现1次峰值,反之洪水曲线仅有1次峰值,降雨量每增加30 mm,峰现时间提前1 h。流溪河模型在任河流域具有较好适用性,多情景模拟结果可为城口县设置暴雨洪水防治措施提供多视角支持。

关键词：暴雨洪水流溪河模型任河流域多情景模拟城口县

Bronchogenic cysts with infection in the chest wall skin of a 64-yearold asymptomatic patient: A case report

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World Journal of Clinical Cases 2022年第23期10卷 8392-8399页

作者： Ben Ma Kai-Wen Fu Xu-dong xie Yue Cheng Sheng-Qiang Wang Department of General Chongqing University Cancer HospitalChongqing 400030China

BACKGROUND Skin bronchogenic cysts are extremely rare congenital bronchocystic changes caused by the abnormal development of the trachea,bronchial trees or lung buds during the embryonic *** first case of skin bronchogenic cysts was reported in *** then,this disease has attracted increasing attention,but due to the low incidence,its pathogenesis is still not *** SUMMARY Here,we report another case of skin bronchogenic cysts with infection in a 64-year-old female *** patient had no symptoms for more than 60 years until her chest wall was recently found to be swollen,and she felt pain and *** the same time,secretions were found on the surface of the *** Doppler ultrasound examination showed abnormal echoes in the soft tissue under the frontal chest wall,suggesting the presence of *** puncture resulted in about 2 mL of pus and showed the presence of more acute inflammatory *** final clinical diagnosis was skin cyst with infection,and surgery was carried *** pathological results obtained after surgery showed that the cystic wall was covered with column-like cilia epithelial cells,and the interstitial structure was partially inundated with inflammatory *** a variety of examinations and clinical diagnoses,we finally confirmed that the patient was suffering from bronchogenic *** This article not only describes the case of an elderly patient with rare skin bronchogenic cysts with infection but also provides a detailed and correct diagnosis and a successful treatment process,which is of great value for the diagnosis and treatment of the disease.

关键词： Bronchogenic cyst Chest wall infection Dermal cyst Benign chest wall lesion Case report

STUDY OF HYDRODYNAMIC FORCES OF SHIPS IN NARROW WATERWAY

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Journal of Hydrodynamics 2003年第4期15卷 113-117页

作者： Zhang xie-dong, Wu Xiu-heng School of Transportation, Wuhan University of Technology, Wuhan 430063, China Sch. of Transp. Wuhan Univ. of Technol. Wuhan 430063 China

The collision of ships in narrow waterway may occur for a variety of *** hydrodynamic forces between two ships change the maneuvering characteristics of ships *** based on the boundary element method, this paper proposes a calculation method for hydrodynamicinteraction forces between ships under meeting and passing conditions in narrow waterway. Theresults from this method are compared with the existing results obtained from other theoreticalapproaches, and they are in good agreement.

关键词： collision of ships narrow waterway hydro-dynamic interaction boundaryelement method

免拆模板-混凝土复合墙体早龄期热湿耦合传递特性研究

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新型建筑材料 2024年第1期51卷 7-13页

作者：汪磊陈国杰侯一帆王钧哲谢东南华大学土木工程学院湖南衡阳421001 建筑环境控制技术湖南省工程实验室湖南衡阳421001 装配式建筑节能技术湖南省重点实验室湖南衡阳421001

以免拆模板-混凝土复合墙体为研究对象,考虑早龄期混凝土水化反应的影响,以毛细压力和温度为驱动势,构建多层墙体一维瞬态热湿耦合传递模型,利用COMSOL Multiphysics模拟研究该复合墙体在早龄期的热湿传递过程。结果表明:水化反应对复... 详细信息

以免拆模板-混凝土复合墙体为研究对象,考虑早龄期混凝土水化反应的影响,以毛细压力和温度为驱动势,构建多层墙体一维瞬态热湿耦合传递模型,利用COMSOL Multiphysics模拟研究该复合墙体在早龄期的热湿传递过程。结果表明:水化反应对复合墙体早龄期热湿特性有重要影响,忽略水化反应会低估复合墙体的温度、高估其湿度。考虑水化反应时,复合墙体中混凝土在前期温升较大、湿度降幅较大。与忽略水化反应的情况相比,前期混凝土含湿量梯度更小、梯度范围更大。与忽略水化反应相比,免拆模板在水化反应早期温度、湿度波动较大。免拆模板具有一定保温隔热和湿缓冲能力。

关键词：免拆模板-混凝土复合墙体早龄期水化反应热湿耦合数值模拟

Considering individual game behavior and time delay in the multi-channel rumor propagation model

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Communications in Theoretical Physics 2024年第7期76卷 9-29页

作者： Yafang dong Liang'an Huo Xiaoxiao xie Ming Li Business School University of Shanghai for Science and TechnologyShanghai 200093China School of Intelligent Emergency Management University of Shanghai for Science and TechnologyShanghai 200093China

The rapid development of the Internet has accelerated the spread of rumors,posing challenges to social cohesion and *** address this,a multi-channel rumor propagation model incorporating individual game behavior and time delay is *** depicts individuals strategically choosing propagation channels in the rumor spread process,capturing real-world intricacies more ***,the model allowing spreaders to choose between text and video information base *** adoption hinges on benefits versus costs,with payoffs dictating strategy and the propagation process determining an individual's *** theoretical analysis of the model,the propagation threshold and equilibrium points are *** the stability of the model is further demonstrated based on Routh-Hurwitz judgment and Descartes'Rule of *** simulations are conducted to verify the correctness of the theoretical results and the sensitivity of the model to key *** outcomes reveal that increasing the propagation cost of spreaders can significantly curb the spread of *** contrast to the classical ISR model,rumors spread faster and more widely in the improved multi-channel rumor propagation model in this paper,which is a feature more aligned with real-world ***,the validity and predictive ability of the model are verified by using real rumor propagation data sets,indicating that the improved multi-channel rumor propagation model has good practical application and predictive value.

关键词： multi-channel rumor propagation time delay game behavior

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髌骨下极粉碎性骨折两种内固定的比较

中国矫形外科杂志 2024年第14期32卷 1279-1284页

作者：汤俊峰孙良业凤晓翔袁先发管立新谢晓东安徽医科大学附属六安医院安徽六安237000

[目的]比较缝线联合固定与钢丝联合固定髌骨下极粉碎性骨折的临床疗效。[方法]回顾性分析2019年1月—2021年12月本院手术治疗的52例髌骨下极粉碎性骨折患者的临床资料。依据术前医患沟通结果,28例采用缝线联合固定(缝线组),24例采用钢... 详细信息

[目的]比较缝线联合固定与钢丝联合固定髌骨下极粉碎性骨折的临床疗效。[方法]回顾性分析2019年1月—2021年12月本院手术治疗的52例髌骨下极粉碎性骨折患者的临床资料。依据术前医患沟通结果,28例采用缝线联合固定(缝线组),24例采用钢丝联合固定(钢丝组)。比较两组围手术期、随访和影像结果。[结果]所有患者均顺利完成手术,术中均无严重并发症发生。两组切口总长度、术中失血量、切口愈合等级差异无统计学意义(P>0.05),但是,缝线组在手术时间[(60.7±7.8)mim vs(67.0±8.8)min,P=0.009]、术中透视次数[(2.2±0.5)次vs(4.3±0.8)次,P0.05),其余相应时间点,缝线组上述指标均显著优于钢丝组(P0.05);相应时间点,缝线组Insall-Salvati指数显著小于钢丝组(P<0.05),而髌骨长度显著大于钢丝组(P<0.05)。缝线组影像学骨折愈合时间显著早于钢丝组(P<0.05)。[结论]缝线垂直间断NICE结固定联合带线锚钉治疗髌骨下极粉碎性骨折临床疗效优于钢丝联合固定,且手术时间短,恢复快,并发症少,无需二次手术取出。

关键词：髌骨下极骨折缝线带线锚钉钢丝内固定

Application research on three-dimensional virtual mine in the framework of internet of things

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Journal of Coal Science & Engineering(China) 2011年第2期17卷 212-216页

作者： WANG Chun-lei xie Hai-dong WANG Zhi-dong JIA Shao-yi School of Earth Science and Mapping Engineering China University of Mining and Technology（Beijing） Beijing 100083 China Economic and Information Branch China Coal Research Institute Beijing 100013 China

Based on the information system characteristics of mine, proposed network architecture design of the mine property. And in this framework based on the design of three-dimensional virtual mine described the application of intelligent management platform. Three-dimensional virtual underground mine that shows the situation, the core application is through remote monitoring system of information exchange between devices （material object communication）. Internet of things in the framework of mining three-dimensional virtual reconstruction of mine. On coal mine safety in the production process of human, machine and environment, control elements and their harmony and unity. 3D virtual mine management platform integrates personnel positioning, dust control, gas monitoring, roof pressure monitoring, fan-line monitoring and other subsystems. Platform through the underground mine sensing equipment to conduct various types of monitoring data integration, through the transport layer device to transmit the information to the application layer intelligence processing software platform, the system automatically handles the operational status of each subsystem and the need for safe production under the proper introduction of human factors deal with special event. 3D virtual mine management platform to mining, excavation, transport, ventilation and other safety information quickly and accurately transmitted to the ground operation control center. Underground for the first time on the linkage between systems in case of emergencies, to provide safety for management decision support.

关键词： internet of things 3D virtual mine system integration monitoring system