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Isolated scaphoid dislocation:A case report and review of literature

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World Journal of Clinical Cases 2022年第8期10卷 2559-2568页

作者： Si-Da Liu bao-Sheng Yin feng Han Hua-jun Jiang Wei Qu Department of Orthopedics The First Affiliated Hospital of Dalian Medical UniversityDalian 116011Liaoning ProvinceChina

BACKGROUND Isolated dislocations of the scaphoid are extremely rare types of injuries,commonly associated with severe ligament disruptions,and are occasionally *** options for dislocations of the scaphoid mainly include closed reduction,with or without internal fixation,and open reduction with ligament *** SUMMARY A 59-year-old male worker sustained a twisting trauma of his right wrist,caused by a moving belt while he was operating a *** he presented at our emergency department,the patient complained of swelling,tenderness,and restriction of movement of the right *** confirmed a primary complex partial radial dislocation of the scaphoid and some chip fractures of the capitate and *** reduction with K-wire internal fixation was performed with the assistance of arthroscopy,and an excellent prognosis was *** Arthroscopy-assisted reduction is a minimally invasive method to reduce the dislocated scaphoid and maintain the blood supply.

关键词： Isolated scaphoid dislocation Classification Delayed diagnose Treatment options Wrist arthroscopy Case report

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加拿大泰科焦煤煤质研究

武钢技术 2011年第5期49卷 1-2,21页

作者：詹立志薛改凤鲍俊芳项茹宋子逵武汉钢铁(集团)公司研究院湖北武汉430080

通过对加拿大泰科焦煤和八矿焦煤的性质的研究,包括单种煤性质研究和配合煤成焦后的性质研究,发现泰科煤虽然单种煤成焦性能比较好,但是在配合煤中只能部分取代国内优质主焦煤;利用泰科煤低灰、低硫的特点适当配入,可以降低焦炭的灰分... 详细信息

通过对加拿大泰科焦煤和八矿焦煤的性质的研究,包括单种煤性质研究和配合煤成焦后的性质研究,发现泰科煤虽然单种煤成焦性能比较好,但是在配合煤中只能部分取代国内优质主焦煤;利用泰科煤低灰、低硫的特点适当配入,可以降低焦炭的灰分和硫含量。

关键词：炼焦煤热性能流动度镜质组反射率

Memristive neuron model with an adapting synapse and its hardware experiments

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Science China(Technological Sciences) 2021年第5期64卷 1107-1117页

作者： bao BoCheng ZHU YongXin MA jun bao Han WU HuaGan CHEN Mo School of Microelectronics and Control Engineering Changzhou UniversityChangzhou 213164China Department of Physics Lanzhou University of TechnologyLanzhou 730050China

Electromagnetic induction effect caused by neuron potential can be mimicked using *** paper considers a fluxcontrolled memristor to imitate the electromagnetic induction effect of adapting feedback synapse and presents a memristive neuron model with the adapting *** memristive neuron model is three-dimensional and *** has the time-varying equilibria with multiple stabilities,which results in the global coexistence of multiple firing *** numerical plots are executed to uncover diverse coexisting firing patterns in the memristive neuron ***,a nonlinear fitting scheme is raised and a fitting activation function circuit is employed to implement the memristive mono-neuron *** coexisting firing patterns are observed from the hardware experiment circuit and the measured results verify the numerical simulations well.

关键词： memristor neuron model coexisting firing patterns nonlinear fitting scheme hardware experiment

Surface quality investigation in high-speed dry milling of Ti-6Al-4V by using 2D ultrasonic-vibration-assisted milling platform

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Advances in Manufacturing 2024年第2期12卷 349-364页

作者： Jin Zhang Li Ling Qian-Yue Wang Xue-feng Huang Xin-Zhen Kang Gui-bao Tao Hua-jun Cao College of Mechanical and Vehicle Engineering Chongqing UniversityChongqing400044People’s Republic of China State Key Laboratory of Mechanical Transmissions Chongqing UniversityChongqing400044People’s Republic of China Aerospace Research Institute of Materials and Processing Technology Beijing100076People’s Republic of China

Ultrasonic-vibration-assisted milling(UVAM)is an advanced method for the efficient and precise machining of difficult-to-machine materials in modern ***,the milling efficiency is limited because the ultrasonic vibration toolholder ER16 collet has a critical cutting ***,a 2D UVAM platform is built to ensure precision machining efficiency and improve the surface quality without changing the milling *** evaluate this 2D UVAM platform,ultrasonic-vibration-assisted high-speed dry milling(UVAHSDM)is performed to process a titanium alloy(Ti-6Al-4V)on the platform,and the milling temperature,surface roughness,and residual stresses are selected as the important indicators for performance *** results show that the intermittent cutting mechanism of UVAHSDM combined with the specific spindle speed,feed speed,and vibration amplitude can reduce the milling temperature and improve the texture of the machined *** with conventional milling,UVAHSDM reduces surface roughness and peak-groove surface profile values and extends the range of residual surface compressive stresses from−413.96 MPa to−600.18 *** excellent processing performance demonstrates the feasibility and validity of applying this 2D UVAM platform for investigating surface quality achieved under UVAHSDM.

关键词： 2D ultrasonic-vibration-assisted milling(UVAM)platform Ultrasonic-vibration-assisted high-speed dry milling(UVAHSDM) Milling temperature Surface roughness Residual stress

Thermal Response of Mould in High Speed Casting of Stainless Steel Billet

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Journal of Iron and Steel Research International 2002年第2期9卷 15-20页

作者： WANG bao-feng SAMARASEKERA I V baotou University of Iron and Steel Tech University of British Columbia

The hot rolling of slab was studied with the aid of elastic plastic and thermomechanical couple FEM. On the basis of experiment and numerical analysis, the physical models for interfacial heat transfer during hot rolling were established. The results indicated that the deformation, cracking and decohesion behavior of the oxide scale have considerable effects on temperature distribution of slab during hot rolling.

关键词： interfacial heat transfer oxide scale temperature distribution hot rolling

Characteristics of secondary electron emission from few layer graphene on silicon(111) surface

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Chinese Physics B 2022年第10期31卷 549-562页

作者： Guo-bao feng Yun Li Xiao-jun Li Gui-Bai Xie Lu Liu National Key Laboratory of Science and Technology on Space Microwave China Academy of Space TechnologyXi’an 710100China School of Computer Science and Engineering Xi’an University of TechnologyXi’an 710048China

As a typical two-dimensional(2D) coating material, graphene has been utilized to effectively reduce secondary electron emission from the surface. Nevertheless, the microscopic mechanism and the dominant factor of secondary electron emission suppression remain controversial. Since traditional models rely on the data of experimental bulk properties which are scarcely appropriate to the 2D coating situation, this paper presents the first-principles-based numerical calculations of the electron interaction and emission process for monolayer and multilayer graphene on silicon(111) substrate. By using the anisotropic energy loss for the coating graphene, the electron transport process can be described more realistically. The real physical electron interactions, including the elastic scattering of electron-nucleus, inelastic scattering of the electron-extranuclear electron, and electron-phonon effect, are considered and calculated by using the Monte Carlo method. The energy level transition theory-based first-principles method and the full Penn algorithm are used to calculate the energy loss function during the inelastic scattering. Variations of the energy loss function and interface electron density differences for 1 to 4 layer graphene coating Go Si are calculated, and their inner electron distributions and secondary electron emissions are analyzed. Simulation results demonstrate that the dominant factor of the inhibiting of secondary electron yield(SEY) of Go Si is to induce the deeper electrons in the internal scattering process. In contrast, a low surface potential barrier due to the positive deviation of electron density difference at monolayer Go Si interface in turn weakens the suppression of secondary electron emission of the graphene layer. Only when the graphene layer number is 3, does the contribution of surface work function to the secondary electron emission suppression appear to be slightly positive.

关键词： secondary electron emission graphene on silicon numerical simulation

Cooling process of iron ore pellets in an annular cooler

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International Journal of Minerals,Metallurgy and Materials 2011年第3期18卷 285-291页

作者： jun-xiao feng Kai-li Liang Zhi-bin Sun Jing-hai Xu Yong-ming Zhang Jin-bao Yang School of Mechanical Engineering University of Science and Technology Beijing Beijing 100083 China Shougang Mining Company Qianan 064404 China

A 3-D mathematical model was presented for the cooling process of iron ore pellets based on the laws of mass, momentum, and heat transfer. The flow, pressure, and temperature fields were obtained by numerical simulation with the commercial software FLUENT. In order to verify the model, a mass and energy balance field test was systematically carried out on an annular cooler in Shougang Mining Company. The maximum relative errors of temperature, pressure, and velocity between computational and testing results are 2.87%, -8.11%, and 7.14%, respectively, indicating the validity of the model. Further, the effects of process parameters, such as pellet diameter, bed thickness, air velocity, and temperature, on the pellet bed temperature profiles were studied.

关键词： iron ore pellets mathematical models cooling numerical analysis

Regularity Criteria of Axisymmetric Weak Solutions to the 3D Magnetohydrodynamic Equations

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Acta Mathematicae Applicatae Sinica 2013年第2期29卷 289-302页

作者： bao-quan YUAN feng-ping LI School of Mathematics and Information Science Henan Polytechnic University

In this paper, we study the regularity criteria for axisymmetric weak solutions to the MHD equa- tions in R3. Let we, Jo and ue be the azimuthal component of w, J and u in the cylindrical coordinates, respectively. Then the axisymmetric weak solution （u,b） is regular on （0, T） if （wo,Jo） E Lq（O,T;Lp） or （oae,V（uoeo）） e Lq（0,T;Lp） with 3 ＋ 2 〈 2, 3 〈 p 〈 oo. In the endpoint case, one needs conditions （we, Jo） C LI（0, T;B∞∞） or （wo, V（uoeo）） C LI（0, T;B ∞∞）.

关键词： regularity criteria axisymmetric solutions Besov space

High-temperature fracture behavior of MnS inclusions based on GTN model

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Journal of Iron and Steel Research International 2019年第9期26卷 941-952页

作者： Xin-gang Liu Can Wang Qing-feng Deng bao-feng Guo Key Laboratory of Advanced Forging and Stamping Technology and Science (Yanshan University) Ministry of Education of ChinaQinhuangdao 066004HebeiChina

The influence of the MnS plastic inclusion on the accumulation of internal damage was considered, and the Gurson– Tvergaard–Needleman (GTN) model was calibrated based on the finite element inverse method and image analysis method using ABAQUS and GTN models. The modified GTN damage model was used to simulate the initiation and propagation of cracks in an as-cast 304 stainless steel with MnS inclusions at 900 C. The simulation results agreed well with the experimental results, indicating that the model can be effectively applied to examine the high-temperature fracture behavior of MnS inclusions. The simulation and high-temperature tensile test results revealed that MnS inclusions increased the number of holes initiation and the probability of hole polymerization, reduced the crack propagation resistance, accelerated the occurrence of material fracture behavior, and were closely related to the stress state at high temperatures. When the stress triaxiality was low, the plastic strain in the metal matrix was high, and the MnS plastic inclusions accelerated the polymerization of the pores, making metal fracture failure more likely. On the other hand, when the stress triaxiality was high, the stress state in the metal matrix was biased to the tensile state, the plastic strain in the metal matrix was low, and the influence of MnS plastic inclusions on the fracture behavior was not evident.

关键词： MnS inclusion GTN model Tension High-temperature fracture behavior Crack initiation Crack propagation Stress