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单一小切口结合蜂巢钛板治疗急性肩锁关节脱位

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中国骨伤 2024年第6期37卷 576-582页

作者：王雨辰俞伟忠李云峰朱文科贾川吴俊琪高华籍麟常州市武进中医医院骨伤科江苏常州213161

目的:探讨单一小切口结合蜂巢钛板治疗急性肩锁关节脱位的临床疗效。方法:回顾性分析2019年12月至2021年12月收治的40例急性肩锁关节脱位患者的临床资料,按照手术方法不同分为两组,其中20例采用单一小切口结合蜂巢钛板进行固定(钛板组),... 详细信息

目的:探讨单一小切口结合蜂巢钛板治疗急性肩锁关节脱位的临床疗效。方法:回顾性分析2019年12月至2021年12月收治的40例急性肩锁关节脱位患者的临床资料,按照手术方法不同分为两组,其中20例采用单一小切口结合蜂巢钛板进行固定(钛板组),男11例,女9例,年龄23~65(47.40±12.58)岁;左侧12例,右侧8例;Rockwood分型,Ⅲ型11例,Ⅳ型3例,Ⅴ型6例。20例采用锁骨钩板固定(锁骨钩组),男8例,女12例,年龄24~65(48.40±12.08)岁;左侧9例,右侧11例;Rockwood分型,Ⅲ型10例,Ⅳ型2例,Ⅴ型8例。比较两组患者手术时间、切口长度、术中失血量、住院时间,以及术前和术后1、3、6个月时疼痛视觉模拟评分(visual analogue scale,VAS),肩关节功能Constant-Murley评分。分别于术前、术后即刻和术后6个月时拍摄患侧肩关节正位X线片,测量并比较喙锁间距。结果:两组患者均顺利完成手术,无严重并发症。40例均获随访,时间6~15(11.9±4.8)个月。未发生切口感染、内置物断裂或失效、骨隧道骨折等并发症。钛板组切口长度(35.90±3.14)mm,短于锁骨钩组(49.30±3.79)mm(P0.05)。术后1、3个月时,钛板组VAS较锁骨钩组更低(P0.05)。结论:单一小切口结合蜂巢钛板治疗急性肩锁关节脱位,切口更短,术后患者肩关节功能恢复更快,且无须二次手术,患者满意度较高。

关键词：肩锁关节脱位喙锁韧带韧带重建小切口

Numerical simulation of transient characteristics in a bulb turbine during the load rejection process

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Journal of Hydrodynamics 2024年第1期36卷 170-183页

作者： yue Lu yu-quan Zhang zhong-wei He yuan Zheng College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing210098China College of Energy and Electrical Engineering Hohai UniversityNanjing210098China Huadong Engineering Corporation Ltd. Hangzhou311122China

To evaluate the safety of the bulb tubular turbine,the dynamic hydraulic characteristics of a hydropower station system during the load rejection process are studied through numerical simulations and a prototype *** the developed model,a dynamic grid technology(DGT)controls the closure of the guide vane and the blade,whilst the moment balance equation and the user-defined function(UDF)provide the runner’s rotation *** 3-D transient simulation method can well predict the rotation speed and mass flow curves in the state of load *** simulation outcomes of the system performance are basically consistent with the measurement data of the *** observed,the runner is subjected to the reversely increased torque and axial force,the system is in a braking phase,and the maximum speed peaks at 144.6%of the rated ***,the internal flow of the runner is greatly affected by the closure of the guide vane,and the draft tube forms an eccentric spiral vortex *** breaks downstream,aggravating the instability of the draft ***,the transient characteristics span for the first five seconds,demonstrating the importance of establishing an efficient governing *** obtained results are useful for designing the turbine’s flow channel with a double regulating function and comprehending the turbine’s transient characteristics.

关键词： Bulb tubular turbine load rejection numerical simulation dynamic grid prototype test

Reinforcement Learning Based Quantization Strategy Optimal Assignment Algorithm for Mixed Precision

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Computers, Materials & Continua 2024年第4期79卷 819-836页

作者： yuejiao Wang zhong Ma Chaojie Yang yu Yang Lu wei Xi’an Microelectronics Technology Institute Xi’an710065China

The quantization algorithm compresses the original network by reducing the numerical bit width of the model,which improves the computation speed. Because different layers have different redundancy and sensitivity to databit width. Reducing the data bit width will result in a loss of accuracy. Therefore, it is difficult to determinethe optimal bit width for different parts of the network with guaranteed accuracy. Mixed precision quantizationcan effectively reduce the amount of computation while keeping the model accuracy basically unchanged. In thispaper, a hardware-aware mixed precision quantization strategy optimal assignment algorithm adapted to low bitwidth is proposed, and reinforcement learning is used to automatically predict the mixed precision that meets theconstraints of hardware resources. In the state-space design, the standard deviation of weights is used to measurethe distribution difference of data, the execution speed feedback of simulated neural network accelerator inferenceis used as the environment to limit the action space of the agent, and the accuracy of the quantization model afterretraining is used as the reward function to guide the agent to carry out deep reinforcement learning training. Theexperimental results show that the proposed method obtains a suitable model layer-by-layer quantization strategyunder the condition that the computational resources are satisfied, and themodel accuracy is effectively *** proposed method has strong intelligence and certain universality and has strong application potential in thefield of mixed precision quantization and embedded neural network model deployment.

关键词： Mixed precision quantization quantization strategy optimal assignment reinforcement learning neural network model deployment

Breaking the Fe_(3)O_(4)-wrapped copper microstructure to enhance copper-slag separation

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International Journal of Minerals,Metallurgy and Materials 2024年第10期31卷 2312-2325页

作者： Xiaopeng Chi Haoyu Liu Jun Xia Hang Chen Xiangtao yu wei Weng Shuiping zhong Zijin School of Geology and Mining Fuzhou UniversityFuzhou 350108China Fujian Key Laboratory of Green Extraction and High-Value Utilization of New Energy Metals Fuzhou UniversityFuzhou 350108China Zijin Mining Group Co. Ltd.Longyan 364200China Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China

The precipitation of Fe_(3)O_(4)particles and the accompanied formation of Fe_(3)O_(4)-wrapped copper structure are the main obstacles to copper recovery from the molten slag during the pyrometallurgical smelting of copper ***,the commercial powdery pyrite or anthracite is replaced with pyrite-anthracite pellets as the reductants to remove a large amount of Fe_(3)O_(4)particles in the molten slag,resulting in a deep fracture in the Fe_(3)O_(4)-wrapped copper microstructure and the full exposure of the copper matte *** 1wt%composite pellet is used as the reductant,the copper matte droplets are enlarged greatly from 25μm to a size observable by the naked eye,with the copper content being enriched remarkably from 1.2wt%to 4.5wt%.Density functional theory calculation results imply that the formation of the Fe_(3)O_(4)-wrapped copper structure is due to the preferential adhesion of Cu_(2)S on the Fe_(3)O_(4)particles.X-ray photoelectron spectroscopy,Fourier transform infrared spectrometer(FTIR),and Raman spectroscopy results all reveal that the high-efficiency conver-sion of Fe_(3)O_(4)to FeO can decrease the volume fraction of the solid phase and promote the depolymerization of silicate network *** a consequence,the settling of copper matte droplets is enhanced due to the lowered slag viscosity,contributing to the high efficiency of copper-slag separation for copper *** results provide new insights into the enhanced in-situ enrichment of copper from mol-ten slag.

关键词： pyrometallurgical smelting process slag cleaning reductants copper matte

Distribution System Restoration with Cyber Failures Based on Co-dispatching of Multiple Recovery Resources

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Journal of Modern Power Systems and Clean Energy 2024年第4期12卷 1096-1112页

作者： Zhengze wei Kaigui Xie Bo Hu yu Wang Changzheng Shao Pierluigi Siano Jun zhong National Key Laboratory of Power Transmission Equipment Technology Chongqing UniversityChongqing 400044China Department of Management and Innovation Systems University of SalernoFisciano 84084Italyand he is also with the Department of Electrical and Electronic Engineering ScienceUniversity of JohannesburgJohannesburg 2006South Africa Shenzhen Power Supply Co. Ltd.China Southern Power GridShenzhen 518000China

Improving the restoration efficiency of a distribu-tion system is essential to enhance the ability of power systems to deal with extreme *** distribution system restoration(DSR)depends on the interaction among the electric network(EN),cyber network(CN),and traffic network(TN).However,the coordination of these three networks and co-dispatching of multiple recovery resources have been mostly *** paper proposes a novel DSR framework,which is formulated as a mixed-integer linear programming(MILP)*** fail-ures in cyber lines result in cyber blind areas,which restrict the normal operation of remote-controlled *** acceler-ate the recovery process,multiple recovery resources are uti-lized including electric maintenance crews(EMCs),cyber main-tenance crews(CMCs),and emergency communication vehicles(ECVs).Specifically,CMCs and ECVs restore the cyber func-tion of switches in cooperation,and EMCs repair damaged elec-tric *** travel time of these three dispatchable resources is determined by *** effectiveness and superiority of the proposed framework are verified on the modified IEEE 33-node and 123-node test systems.

关键词： Distribution system restoration(DSR) network coupling maintenance crew co-dispatching emergency communicationvehicle

Study of baryon number transport dynamics and strangeness conservation effects using Ω-hadron correlations

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Nuclear Science and Techniques 2024年第7期35卷 147-156页

作者： wei-Jie Dong Xiao-Zhou yu Si-yuan Ping Xia-Tong Wu Gang Wang Huan-zhong Huang Zi-wei Lin Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Fudan UniversityShanghai 200433China Department of Physics and Astronomy University of CaliforniaLos AngelesCA 90095USA Department of Physics East Carolina UniversityGreenvilleNC 27858USA

In nuclear collisions at RHIC energies, an excess of Ω hyperons over ■ is observed, indicating that Ω has a net baryon number despite s and s quarks being produced in pairs. The baryon number in Ω may have been transported from the incident nuclei and/or produced in the baryon-pair production of Ω with other types of anti-hyperons such as Ξ. To investigate these two scenarios, we propose to measure the correlations between Ω and K and between Ω and anti-hyperons. We use two versions, the default and string-melting, of a multiphase transport(AMPT) model to illustrate the method for measuring the correlation and to demonstrate the general shape of the correlation. We present the Ω-hadron correlations from simulated Au+Au collisions at ■ =7.7 and 14.6 Ge V and discuss the dependence on the collision energy and on the hadronization scheme in these two AMPT versions. These correlations can be used to explore the mechanism of baryon number transport and the effects of baryon number and strangeness conservation on nuclear collisions.

关键词： Baryon number transport Strangeness conversation Correlation Gluon junction

Tungsten disulfide-based nanomaterials for energy conversion and storage

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Tungsten 2020年第2期2卷 109-133页

作者： Chang‑Bin Sun yu‑wei zhong Wen‑Jie Fu Ze‑Quan Zhao Jie Liu Jia Ding Xiao‑Peng Han Yi‑Da Deng Wen‑Bin Hu Cheng zhong School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou 350207China

Energy and environmental issues received widespread attentions due to the fast growth of world population and rapid development of social *** a transition metal dichalcogenide,tungsten disulfide(WS_(2))nanomaterials make important research progress in the field of energy conversion and *** view of the versatile and rich microstructure of these mate-rials,the modification and controllable synthesis of WS_(2) nanomaterials also inspire a research *** review mainly focuses on WS_(2)-based nanomaterials in the application of energy conversion and storage as well as discusses some basic characteristics and modification strategies of ***,the research progress of WS_(2)-based nanomaterials is reviewed and some prospects for future research directions are *** review is expected to be beneficial to the future study of WS_(2) nanomaterials used in the field of energy conversion and storage.

关键词： Nanomaterials Tungsten disulfide Controlled synthesis Energy conversion Energy storage

Recent progress in self-propelled particles

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Journal of Hydrodynamics 2024年第1期36卷 61-77页

作者： Zhen-yu Ouyang Jian-zhong Lin Laboratory of Impact and Safety Engineering Ministry of EducationNingbo UniversityNingbo315201China Department of Mechanics State Key Laboratory of Fluid Power and Mechatronic SystemsZhejiang UniversityHangzhou310027China

Self-propelled particles are commonly found in a large number of planktonic organisms such as bacteria,fungi,and algae in nature,and researchers have taken a long interest in exploring their swimming mechanisms for more than a *** in the past 20 years,with the development of computational fluid dynamics and flow display technology,as well as the need for the design of synthetic self-propelled particles and micro-swimming devices,self-propelled particles have become the forefront and hotspot of current research in the field of fluid *** paper first introduces the swimming characteristics of common self-propelled particles,leading to a classic“squirmer”type self-propelled particle *** this basis,a systematic introduction and summary of the theoretical and numerical simulation research of“squirmer”will be ***,the main challenges and opportunities faced by the current research will be summarized.

关键词： Self-propelled particles multiphase flow hydrodynamic interaction

A new exploration on the creation of grafted breast cancer model for MA891 cells in TA2 mice

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Chinese Medical Journal 2005年第21期118卷 1830-1833页

作者： GU Jun-chao yu wei-bo ZHANG zhong-tao WANG yu Department of General Surgery Beijing Friendship Hospital Affiliated with Capital University of Medical Sciences Beijing 100050 China

Animal experimental systems are particularly useful for the study of human breast cancer. An ideal model shoulcl be easy to use, closely mimicking human physiopathology and has a stable tumor morbidity. The cell line MA891 was established from a spontaneous TA2 mouse mammary carcinoma by Cancer Institute of Chinese Academy of Medical Sciences. 3 Some researches indicated that MA891 had a very low immunogenecity and maintained a high metastatic potential in vivo. So it has been used as a better grafted mouse tumor model for studying cancer physiopathology and metastasis in human for years. However, about the biological characteristic and the histopathologic feature of this model there has been a lack of investigations.

关键词： breast cancer MA891 cell animal model