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Impact mechanism of gas temperature in metal powder production via gas atomization

Chinese Physics B 2021年第5期30卷 437-451页

作者： Peng Wang Jing Li Xin Wang Bo-Rui Du shi-yuan shen Xue-yuan Ge Miao-Hui Wang State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science&TechnologyBeijing 100083China Beijing National Innovation Institute of Lightweight Ltd Beijing 100083China

This paper aims at studying the influence mechanism of gas temperatures(300 K,400 K,500 K,and 600 K)on gas atomization by simulating the integral atomization process of the close-coupled nozzle in vacuum induction gas atomization(VIGA).The primary atomization is simulated by the volume of fluid(VOF)approach,and the second atomization is studied by the discrete phase model(DPM)combined with the instability breakage *** results show that,at an increased gas temperature,the influences of gas-liquid contact angle and gas temperature in the recirculation zone on the primary atomization are virtually ***,increasing the gas temperature will increase the gas-liquid relative velocity near the recirculation zone and decrease the melt film thickness,which are the main reasons for the reduced mass median diameter(MMD,d50)of primary atomized *** the secondary atomization,increasing the gas temperature from 300 K to 600 K results in an increase in the droplet dispersion angle,which is beneficial to the formation of spherical metal *** addition,increasing the gas temperature,the positive effect of gas-liquid relative velocity increase on droplets refinement overweighs the negative influence of the GMR decrease,resulting in the reduced MMD and diameter distribution *** the analysis of the atomization mechanism,the increase in atomization efficiency caused by increasing the temperature of the atomizing gas,including primary atomization and secondary atomization,is mainly due to the increase in the gas drag force difference between the inner and outer sides of the annular liquid film.

关键词： metallic powders VIGA technology argon temperature two-phase flow

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Growth, Gas Exchange, Abscisic Acid, and Calmodulin Response to Salt Stress in Three Poplars

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Journal of Integrative Plant Biology 2006年第3期48卷 286-293页

作者： Yu Chang Shao-Liang Chen Wei-Lun Yin Rui-Gang Wang Yan-Feng Liu Yong shi yuan-yuan shen Yue Li Jie Jiang Yue Liu College of Biological Science and Technology Beijing Forestry University Beijing 100083 China

In the present study, we Investigated the effects of Increaslng sallnlty on growth, gas exchange, absclslc acld （ABA）, calmodulln （CAM）, and the relevance to salt tolerance In seedllngs of Populus euphratlca Ollv. and cutUngs of P. ＂pupularls 35-44＂（P. popularls） and P. x euramerlcana cv. 1-214 （P. cv. Itallca）. The relatlve growth rates of shoot helght （RGR,） for P. cv. Itallca and P. popularls were severely reduced by Increaslng salt stress, whereas the growth reductlon was relatlvely less in P. euphratica. Slmllarly, P. euphratlca malntalned hlgher net photosynthetlc rates （Pn） and unlt transplration rotes （TRN） than P. cv. Itallca and P. popularls under condltlons of hlgher sallnlty. Sallnity caused a slgnlficant increase In leaf ABA and CaM In the three genotypes after the onset of stress, but NaCl-induced ABA and CaM accumulatlon was more pronounced In P. euphratlca, suggeeUng that P. euphratlca plants are more sensitlve in sensing soil salinlty than the other two poplars. Furthermore, P. euphratica maintained relatively higher ABA and CaM concentrations under conditions of high salinity. The higher capacity to synthesize stress signals, namely ABA and CaM, In P. euphratica and the contrlbuUon of this to the salt resistance of P. euphratica are discussed.

关键词： abscisic acid calmodulin gas exchange growth NaCl Populus euphratica.

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Process modeling gas atomization of close-coupled ring-hole nozzle for 316L stainless steel powder production

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Chinese Physics B 2021年第5期30卷 617-629页

作者： Peng Wang Jing Li Hen-San Liu Xin Wang Bo-Rui Du Ping Gan shi-yuan shen Bin Fan Xue-yuan Ge Miao-Hui Wang State Key Laboratory for Advanced Forming Technology and Equipment China Academy of Machinery and TechnologyBeijing 100083China Beijing National Innovation Institute of Lightweight Ltd. Beijing 100083China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China

The paper aims at modeling and simulating the atomization process of the close-coupled ring-hole nozzle in vacuum induction gas atomization(VIGA)for metallic powder *** of all,the primary atomization of the ring-hole nozzle is simulated by the volume of fluid(VOF)coupled large eddy simulation(LES)*** simulate the secondary atomization process,we use the method of selecting the droplet sub-model and the VOF *** results show that the ring-hole nozzle forms a gas recirculation zone at the bottom of the delivery tube,which is the main reason for the formation of an annular liquid film during the primary *** addition,the primary atomization process of the ring-hole nozzle consists of three stages:the formation of the serrated liquid film tip,the appearance and shedding of the ligaments,and the fragmentation of *** the same time,the primary atomization mainly forms spherical droplets and long droplets,but only the long droplets can be reserved and proceed to the secondary ***,increasing the number of ring holes from 18 to 30,the mass median diameter(MMD,d_(50))of the primary atomized droplets decreases first and then increases,which is mainly due to the change of the thickness of the melt ***,the secondary atomization of the ring-hole nozzles is mainly in bag breakup mode and multimode breakup model,and bag breakup will result in the formation of hollow powder,which can be avoided by increasing the gas velocity.

关键词： metallic powder hollow powder gas atomization ring-hole nozzle

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行列式求值的拓扑算法

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数值计算与计算机应用 1983年第3期 142-150页

作者：迟忠先申石虎杨元生大连工学院东北重型机械学院

众所周知,在矩阵与有向图之间存在着某种对应关系。在图论中,一个有向图可以用一个矩阵来表示,从而可利用矩阵的运算规则来计算图的某些性质。在矩阵论中,有向图不仅可以做为矩阵的形象表示,而且可以利用图论的办法计算出矩阵的有关性质... 详细信息

众所周知,在矩阵与有向图之间存在着某种对应关系。在图论中,一个有向图可以用一个矩阵来表示,从而可利用矩阵的运算规则来计算图的某些性质。在矩阵论中,有向图不仅可以做为矩阵的形象表示,而且可以利用图论的办法计算出矩阵的有关性质。Mason

关键词：稀疏矩阵结点有向图奇点图(数学) 拓扑算法行列式求值有向树

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新时期高校离退休教师在大学文化传承创新中的价值研究

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科教导刊 2018年第7期 70-71页

作者：刘国新石媛沈光南京工业大学海外事务部江苏南京211816 南京工业大学高等教育发展研究院江苏南京211816 南京工业大学党委组织部江苏南京211816

高校离退休教师是大学文化传承创新的重要主体,他们在长期的工作实践中积累了丰富知识和宝贵经验,德高望重,具有独特的政治优势、威望优势、经验优势、知识优势、环境优势。高校应多方面、多层次、多角度探索保障措施,充分发挥离退休教... 详细信息

高校离退休教师是大学文化传承创新的重要主体,他们在长期的工作实践中积累了丰富知识和宝贵经验,德高望重,具有独特的政治优势、威望优势、经验优势、知识优势、环境优势。高校应多方面、多层次、多角度探索保障措施,充分发挥离退休教师在大学文化传承与创新中传承、示范、帮扶、引领、监督的作用,让他们为世界一流大学建设贡献自我价值。本课题基于此背景,梳理高校离退休教师的现状和其在大学在文化传承创新的可行性和优势,力争通过研究及问卷调查(以南京工业大学为例),探究高校离退休教师在文化传承创新工作中的价值及发挥价值的路径,并最终提出总结与建议。

关键词：高校离退休教师大学文化传承创新价值

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Role of the globus pallidus in motor and non-motor symptoms of Parkinson's disease

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Neural Regeneration Research 2025年第6期20卷 1628-1643页

作者： Yimiao Jiang Zengxin Qi Huixian Zhu Kangli shen Ruiqi Liu Chenxin Fang Weiwei Lou Yifan Jiang Wangrui yuan Xin Cao Liang Chen Qianxing Zhuang Department of Physiology School of MedicineNantong UniversityNantongJiangsu ProvinceChina Department of Neurosurgery Huashan HospitalShanghai Medical CollegeFudan UniversityShanghaiChina National Center for Neurological Disorders ShanghaiChina Shanghai Key Laboratory of Brain Function Restoration and Neural Regeneration ShanghaiChina State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science Institute of Brain ScienceFudan UniversityShanghaiChina

The globus pallidus plays a pivotal role in the basal ganglia circuit. Parkinson's disease is characterized by degeneration of dopamine-producing cells in the substantia nigra, which leads to dopamine deficiency in the brain that subsequently manifests as various motor and non-motor symptoms. This review aims to summarize the involvement of the globus pallidus in both motor and non-motor manifestations of Parkinson's disease. The firing activities of parvalbumin neurons in the medial globus pallidus, including both the firing rate and pattern, exhibit strong correlations with the bradykinesia and rigidity associated with Parkinson's disease. Increased beta oscillations, which are highly correlated with bradykinesia and rigidity, are regulated by the lateral globus pallidus. Furthermore,bradykinesia and rigidity are strongly linked to the loss of dopaminergic projections within the cortical-basal ganglia-thalamocortical loop. Resting tremors are attributed to the transmission of pathological signals from the basal ganglia through the motor cortex to the cerebellum-ventral intermediate nucleus circuit. The cortico–striato–pallidal loop is responsible for mediating pallidi-associated sleep disorders. Medication and deep brain stimulation are the primary therapeutic strategies addressing the globus pallidus in Parkinson's disease. Medication is the primary treatment for motor symptoms in the early stages of Parkinson's disease, while deep brain stimulation has been clinically proven to be effective in alleviating symptoms in patients with advanced Parkinson's disease,particularly for the movement disorders caused by levodopa. Deep brain stimulation targeting the globus pallidus internus can improve motor function in patients with tremordominant and non-tremor-dominant Parkinson's disease, while deep brain stimulation targeting the globus pallidus externus can alter the temporal pattern of neural activity throughout the basal ganglia–thalamus network. Therefore, the comp

关键词： anxiety basal ganglia bradykinesia deep brain stimulation depression globus pallidus externus globus pallidus internus lateral globus pallidus medial globus pallidus neural circuit Parkinson's disease

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Cerebral fat embolism following autologous fat injection in facial reconstruction:A case report

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World Journal of Clinical Cases 2025年第2期13卷 50-58页

作者： Xiu-Ying Chen Fa shen Chang Cheng Yu-Han Wang Wen-Chao Cheng De-Zhi yuan Wen Huang Department of Neurology Chongqing Emergency Medical CenterChongqing University Central HospitalChongqing 400000China Department of Neurology Xinqiao HospitalThe Army Medical University(Third Military Medical University)Chongqing 400000China

BACKGROUND Autologous fat injection in facial reconstruction is a common cosmetic *** cerebral fat embolism(CFE)as a complication is rare,it carries serious health *** SUMMARY We present a case of a 29-year-old female patient who developed acute CFE following facial fat filling *** the surgery,the patient experienced symptoms including headache,nausea,vomiting,and difficulty breathing,which was followed by neurological symptoms such as slurred speech and left-sided *** physical examination and auxiliary investigations,including blood tests,head and neck computed tomography angiography,and cranial magnetic resonance diffusion-weighted imaging,were performed upon *** clinical diagnosis was acute cerebral embolism following facial fat filling *** included measures to improve cerebral circulation,dehydration for intracranial pressure reduction,nutritional support,and rehabilitation therapy for left limb *** patient showed a significant improvement in symptoms after 2 weeks of *** recovered left limb muscle strength to grade 5,had clear speech,and experienced complete relief of *** Our case highlights the potential occurrence of severe complications in patients undergoing fat injection in facial *** prevent these complications,plastic surgeons should enhance their professional knowledge and skills.

关键词： Cerebral fat embolism Mechanical thrombectomy Thrombolysis Steroid therapy Symptomatic treatment Case report

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50个鲜食糯玉米农艺性状和SSR标记遗传多样性分析

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上海农业学报 2016年第5期32卷 11-15页

作者：韩晴卢媛王义发逯连静沈新芬沈渊施标沈雪芳上海市农业科学院作物育种栽培研究所上海201403 上海市农业科学院农业科技信息研究所上海201403 上海市金山区农业技术推广中心上海201599 上海市农业科学院上海201403

对50份不同来源糯玉米品种的农艺性状和产量进行了鉴定,并利用40个SSR标记对其进行遗传多样性分析。结果表明:50份糯玉米秃尖长、穗位高、毛重和净重变异较大。40个SSR标记在50份糯玉米品种上共检测到190个等位基因变异,等位基因变异范... 详细信息

对50份不同来源糯玉米品种的农艺性状和产量进行了鉴定,并利用40个SSR标记对其进行遗传多样性分析。结果表明:50份糯玉米秃尖长、穗位高、毛重和净重变异较大。40个SSR标记在50份糯玉米品种上共检测到190个等位基因变异,等位基因变异范围为2—9,平均每个位点检测到4.75个等位基因。每对SSR标记的多态性信息量(PIC)变化范围在0.430—0.844,平均为0.675。利用UPGMA聚类分析方法进行聚类,共划分为3个主要类群,聚类结果与品种的来源基本一致。50份糯玉米品种遗传多样性丰富,为组配糯玉米杂交新品种和遗传改良提供基础。

关键词：糯玉米农艺性状 SSR 遗传多样性

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基于视频游戏的空间能力测评

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心理科学进展 2025年第1期33卷 11-24页

作者：尚俊杰石祝沈科杰北京大学教育学院学习科学实验室北京100871

空间能力是个体对客体或空间图形在头脑中进行识别、编码、贮存、表征、分解组合和抽象概括的能力,是个体理解自身所处环境并解决问题的认知基础。准确、便捷、有效地测评空间能力,对增强STEM教育教学水平和人才培养质量都具有重要意义... 详细信息

空间能力是个体对客体或空间图形在头脑中进行识别、编码、贮存、表征、分解组合和抽象概括的能力,是个体理解自身所处环境并解决问题的认知基础。准确、便捷、有效地测评空间能力,对增强STEM教育教学水平和人才培养质量都具有重要意义。由于空间能力受多因素共同作用,具有复杂性、多维度、内隐性的特点,使得利用计算机评价空间能力比较困难。本研究旨在准确、有效、大规模地测评空间能力,将使用多模态学习分析方法探索学习者空间认知行为表现特征,并基于视频游戏环境研发空间能力隐形测评关键技术与工具。具体包括:1)构建空间能力内在表征框架和评价指标体系;2)基于多模态学习分析构建学习者空间能力行为表现模型;3)探索视频游戏影响空间能力的关键因素,并使用游戏引擎开发基于视频游戏的测评工具;4)使用以证据为中心的设计框架和贝叶斯网络模型,开发并部署能够推断和预测空间能力的测评算法;5)在实验室和真实课堂情境开展实证研究,验证测评工具有效性。研究成果将有利于理解人类空间认知过程和行为表现,拓展和丰富空间能力相关理论,并为大规模数字化测评提供关键技术支撑。

关键词：基于游戏的测评空间能力多模态学习分析游戏化学习隐形测评

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Ru doping triggering reconstruction of cobalt phosphide for coupling glycerol electrooxidation with seawater electrolysis

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Journal of Energy Chemistry 2025年第1期100卷 317-326页

作者： Binglu Deng Jie shen Jinxing Lu Chuqiang Huang Zhuoyuan Chen Feng Peng Yunpeng Liu School of Materials Science and Hydrogen Energy Foshan University School of Chemistry and Chemical Engineering Guangzhou University Guangdong Key Laboratory for Hydrogen Energy Technologies

Seawater electrolysis is a promising approach for sustainable energy without relying on precious ***,the large-scale seawater electrolysis is hindered by low catalytic efficiency and severe anode corrosion caused by the harmful *** contrast to the oxygen evolution reaction （OER）and chlorin ion oxidation reaction （ClOR）,glycerol oxidation reaction （GOR） is more thermodynamically and kinetically favorable ***,a Ru doping cobalt phosphide （Ru-CoP2） is proposed as a robust bifunctional electrocatalyst for seawater electrolysis and GOR,for the concurrent productions of hydrogen and value-added *** in situ and ex situ characterization analyses demonstrated that Ru doping featured in the dynamic reconstruction process from Ru-CoP2to Ru-CoOOH,accounting for the superior GOR *** coupling GOR with hydrogen evolution was realized by employing Ru-CoP2as both anode and cathode,requiring only a low voltage of 1.43 V at 100 mA cm-2,which was 250 m V lower than that in alkaline *** work guides the design of bifunctional electrocatalysts for energy-efficient seawater electrolysis coupled with biomass resource upcycling.

关键词： Glycerol electrooxidation Hydrogen evolution Ru doping Cobalt phosphide Bifunctional electrocatalysts

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