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Investigation of ion-atom collision dynamics through imaging techniques

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Science China(Physics,Mechanics & Astronomy) 2008年第7期51卷 755-764页

作者： MA XinWen zhu xiaolong LIU HuiPing LI Bin ZHANG ShaoFeng CAO ShiPing FENG WenTian XU ShenYue Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Graduate University of Chinese Academy of Sciences Beijing 100049China

The principle and technique details of recoil ion momentum imaging are discussed and summarized. The recoil ion momentum spectroscopy built at the Institute of Modern Physics (Lanzhou) is presented. The first results obtained at the setup are analyzed. For 30 keV He2+ on He collision, it is found that the capture of single electron occurs dominantly into the first excited states, and the related scattering angle results show that the ground state capture occurs at large impact parameters, while the capture into excited states occurs at small impact parameters. The results manifest the collision dynamics for the sub-femto-second process can be studied through the techniques uniquely. Finally, the future possibilities of applications of the recoil ion momentum spectroscopy in other fields are outlined.

关键词： imaging of recoil ion momentum collision dynamics state-selective cross section angular differential cross section

Experimental study on the key factors of low-loss threshing of high-moisture maize

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International Journal of Agricultural and Biological Engineering 2020年第5期13卷 23-31页

作者： xiaolong zhu Ruijuan Chi Yuefeng Du Jiahao Qin Zexin Xiong Weitong Zhang Xiaoyu Li College of Engineering China Agricultural UniversityBeijing 100083China Beijing Key Laboratory of Optimized Design for Modern Agricultural Equipment China Agricultural UniversityBeijing 100083China

The rates of maize breakage and entrainment loss are high in the harvest of high-moisture maize,which remains an issue with the development of agricultural *** order to reduce the maize breakage and entrainment loss rates,the correlations among key factors,such as the threshing cylinder speed,concave clearance and feeding rate,and the rates of breakage and entrainment loss during high-moisture maize harvesting were studied in this paper.A single-factor experiment was carried out using a single-longitudinal-axial flow maize harvester,and an orthogonal experiment was carried out using single-and double-longitudinal-axial flow maize harvesters with the Taguchi experimental design *** single-factor experiment revealed that when the cylinder speed increased,the breakage rate of maize decreased first and then increased,while the entrainment loss rate *** breakage rate of maize decreased as the concave clearance increased,while the entrainment loss rate decreased first and then *** optimum value of the concave clearance was positively correlated with the ear diameter of maize;Additionally,the minimum breakage rate of maize occurred when the feeding rate was at the rated value,and the entrainment loss rate increased as the feeding rate *** orthogonal experiments revealed that the importance of cylinder speed,feeding rate,concave clearance on the maize breakage and entrainment loss rates were in descending *** optimum values of parameters for the single-longitudinal-axial flow maize harvester were 370 r/min cylinder speed,40 mm concave clearance and 10 kg/s feeding *** optimum values of parameters the double-longitudinal-axial flow maize harvester were 550 r/min cylinder speed,35 mm concave clearance and 10 kg/s feeding *** research can provide a reference for parameter configuration and control strategy for the longitudinal-axial flow maize harvester with high-moisture maize.

关键词： high-moisture maize maize harvester parameter configuration Taguchi experiment

环保型泡沫灭火剂在变压器油表面的铺展特性研究

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山东电力技术 2024年第8期51卷 67-77页

作者：李国春齐国栋孔帅朱小龙王东路国网山东省电力公司电力科学研究院山东济南250003 中国科学技术大学安徽合肥230026

针对油浸式变压器面临的火灾风险,通过正交实验研究了短链氟碳-碳氢表面活性剂复配体系和有机硅-碳氢表面活性剂复配体系分别在变压器油表面的界面特性及铺展能力。界面张力测试结果表明,阴离子碳氢表面活性剂和阳离子碳氢表面活性剂分... 详细信息

针对油浸式变压器面临的火灾风险,通过正交实验研究了短链氟碳-碳氢表面活性剂复配体系和有机硅-碳氢表面活性剂复配体系分别在变压器油表面的界面特性及铺展能力。界面张力测试结果表明,阴离子碳氢表面活性剂和阳离子碳氢表面活性剂分别与氟碳表面活性剂FS-50和有机硅表面活性剂DOWSIL 501w、DOWSIL 5211进行复配时,均可形成扩散系数显著大于0的复配体系。然而油面铺展实验表明,并非所有扩散系数大于0的溶液都能在变压器油表面铺展,这是因为一些配方会导致油-水界面张力降至0,从而发生油/水混溶,进而导致泡沫液无法铺展。因此,单纯通过扩散系数无法断定泡沫灭火剂是否具有成膜性能,在油面开展铺展验证实验是必要的。此外,铺展实验结果显示,有机硅表面活性剂DOWSIL 5211分别与α-烯基磺酸钠(sodium alpha-olefin sulfonate,AOS)和十二烷基硫酸钠(sodium dodecyl sulfate,SDS)混合溶于水时也能在变压器油表面自发铺展,所以针对变压器火灾研发无氟水成膜泡沫(aqueous film forming foam,AFFF)灭火剂是可行的。研究结果将为环保型水成膜泡沫灭火剂开发提供重要数据支撑和理论指导。

关键词：变压器油火灾水成膜泡沫可降解表面活性剂环保灭火泡沫

Effect of Gap Size on Seedling Establishment of Tsuga longibracteata

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Chinese Forestry Science and Technology 2007年第3期6卷 66-71页

作者： zhu xiaolong Research Institute of Forestry Policy and Information Chinese Academy of Forestry Beijing 100091 P. R. China

Effects of three gaps which are large (118 m2), medium (86 m2) and small (20 m2), respectively, and under canopy of Tsuga longibracteata forest on the seedling establishment of T. longibracteata were studied through seed burial experiments from December 2003 to January 2005 in Tianbaoyan National Nature Reserve of Fujian, China. The results showed that the area of gap had an evident effect on the seedling establishment of T. longibracteata. The seedling emergence rates of T. longibracteata in plots of large gap, medium gap, small gap and under canopy were 10%, 10%, 4% and 6%, representing an increasing trend along with the gap size increasing without a significant difference. Rain eroding and insects feeding were two main factors leading to seedling death. The larger the gap size was, the more seedlings were killed by rain erosion and the fewer seedlings were killed by insects feeding. The emergence time of seedlings was almost same in all plots while their death time was different respectively. The gap size had a significant impact on seedling survival rate. The seedling survival rate was highest in the medium gap plot (27.0%) and next to the highest in large gap plot (7.3%), and seedling in small gap plot and under canopy plot died out after one growing season. Increased light supply in gaps was favorable for the seedlings growth and survival. Increased light supply in the large gap could enhance the growth of seedling leaf and root of T. longibracteata, and the seedling in turn allocated more dry mass to root and leaf, but it has little impact on the growth of stem. This research indicates that T. longibracteata is a pioneer species and its seedling establishment need a medium or large gap (>50 m2).

关键词： Tsuga longibracteata canopy gap seedling emergence seedling growth

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柔性化加工单元智能化升级改造应用研究

科学技术创新 2024年第17期 41-44页

作者：贾广林王航赵文渊朱小龙孙志宏中车大同电力机车有限公司山西大同

柔性化制造系统(FMS)是集计算机技术、数字控制技术、网络通信技术以及现代生产管理技术于一体的现代制造系统,对促进公司制造技术的发展和进步都发挥了重要作用。本文提出了一种智能化改造升级的提升方案,该方案可以提高加工效率、加... 详细信息

柔性化制造系统(FMS)是集计算机技术、数字控制技术、网络通信技术以及现代生产管理技术于一体的现代制造系统,对促进公司制造技术的发展和进步都发挥了重要作用。本文提出了一种智能化改造升级的提升方案,该方案可以提高加工效率、加工精度、加工稳定性等方面的能力,能够实现“黑灯工厂”无人化生产,具有很好的实用价值和应用前景。相关论述,以供参考。

关键词：机器人 FMS 柔性化加工单元智能化改造黑灯工厂

THE INITIAL CORROSION MECHANISM OFα-PHASE ALUMINIUM BRONZE IN NaCI SOLUTION

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Transactions of Nonferrous Metals Society of China 1992年第1期2卷 69-72,76页

作者： zhu xiaolong Li Renshun Wu Rengeng Zhou Derui General Research Institute for Non-Ferrous Metals Beijing 100088China Harbin Institute of Technology Harbin 150006China

The polarization curves of theα-PHASE aluminium bronze measured in 5%NaCl electrochemically show that the corrosion process of the alloy is controlled by the diffusion of *** corrosion surface of theα-PHASE A1 bronze in NaCl solution for a short time was analysed by X-ray Photoelectron Spectroscopy(XPS).The results indicate that the initial corrosion product of the A1 bronze consists of a simple Cu20 phase.A1 and Ni are incorporated in Cu20 lattice structure in the form of ions,and none of the aluminium compound can be *** authors propose that the initial corrosion mechanism ofα-PHASE A1 bronzes in NaCl solution should include oxidation,reduction and diffusion.

关键词： α-phase Al bronze NaCl solution initial corrosion X-ray Photoelectron Spectroscopy

肾移植术后供者特异性抗体针对性治疗单中心效果观察

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中华器官移植杂志 2024年第9期45卷 628-635页

作者：朱晓隆付嘉钊陆瀚澜赵闻雨隋明星曾力朱有华张雷海军军医大学第一附属医院器官移植科上海200433

目的探讨供者特异性抗体(donor specific antibodies,DSA)针对性治疗的疗效和影响因素。方法回顾性观察分析2016年1月至2021年1月在海军军医大学第一附属医院接受肾移植手术、行DSA规律检测并发现阳性且接受以利妥昔单抗(rituximab,RTX... 详细信息

目的探讨供者特异性抗体(donor specific antibodies,DSA)针对性治疗的疗效和影响因素。方法回顾性观察分析2016年1月至2021年1月在海军军医大学第一附属医院接受肾移植手术、行DSA规律检测并发现阳性且接受以利妥昔单抗(rituximab,RTX)联合静脉注射丙种球蛋白(intravenous immune globulin,IVIG)为基础的DSA针对性治疗方案的34例受者的临床资料。分析预存DSA(preformed DSA,pfDSA)转阴率与DSA类别、治疗开始距离移植手术时间、DSA针对的HLA位点及DSA强度的相关性,治疗前后免疫显性DSA(immunodominant DSA,iDSA)水平及新生DSA(de novo DSA,dnDSA)阳性受者血肌酐水平变化情况。结果全部34例受者中,治疗后3个月完全转阴17例(50%),末次随访时转阴19例(55.9%)。对受者体内针对所有位点的78个DSA进行统计后发现,pfDSA及dnDSA的转阴率在治疗后3个月[62.9%(39/62)比37.5%(6/16)]及末次随访时[74.2%(46/62)比56.3%(9/16)]差异均没有统计学意义(P=0.067和0.219)。对于pfDSA,治疗3个月后,不同MFI强度的pfDSA转阴率差异明显[DSA弱阳性转阴率78.6%(33/42),DSA阳性及以上转阴率30%(6/20),P<0.001],而且是pfDSA能否转阴的独立影响因素(48.6%,95%CI:22.3%~66.8%,P=0.001)。末次随访时,不同治疗开始时间受者的pfDSA转阴率差异明显[术后30 d以内转阴率79.2%(42/53),术后30 d以上转阴率44.4%(4/9),P=0.042],不同DSA MFI强度受者的pfDSA转阴率亦差异明显[DSA弱阳性转阴率88.1%(37/42),DSA阳性及以上转阴率45%(9/20),P<0.001],而且两者都是pfDSA能否转阴的独立影响因素(34.8%,95%CI:3.2%~61.8%,P=0.008;43.1%,95%CI:18.5%~63.4%,P=0.001)。治疗后3个月免疫显性DSA(immunodominant DSA,iDSA)的平均荧光强度(mean fluorescence intensity,MFI)较治疗前下降幅度的均值为66.67%,末次随访时iDSA MFI下降幅度的均值为77.90%,差异有统计学意义(P=0.035)。9例dnDSA弱阳性及以上强度受者治疗前、治疗期间、治疗后3个月及末次随访时的血肌酐值分别为(110.2±26.9)μmol/L、(178.8±90.5)μmol/L、(153.9±72.8)μmol/L及(213.6±185.8)μmol/L。治疗期间血肌酐水平较治疗前明显上升(配对样本t检验,t=-2.794,P=0.023),治疗后3个月较治疗期间明显下降(配对样本t检验,t=3.430,P=0.009),而末次随访时较治疗后3个月再次上升(秩和检验,P=0.028)。结论接受以RTX+IVIG为基础的DSA针对性治疗后,pfDSA的转阴率与其强度及接受治疗的时间明显相关,治疗后DSA总体无明显反弹,dnDSA阳性受者的移植肾功能在治疗后短期内得到一定改善。

关键词：肾移植供者特异性抗体利妥昔单抗静脉注射丙种球蛋白

INFLUENCE OF THE MICROSTRUCTURE OF Cu-Ni ALLOY ON ITS CORROSION RESISTANCE

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Transactions of Nonferrous Metals Society of China 1992年第4期2卷 51-55页

作者： zhu xiaolong General Research Institute for Nonferrous Metals Beijing 100088China

The microstructures of two kinds of Cu-Ni alloys were observed by *** results show that one of the alloys is a homogeneous solid *** other contains discontinuous precipitates at some grain boundaries,and the precipitate is a phase rich in *** monitoring the corrosion potential(E_(con))in artifical seawater and exposure to natural seawater for a long time,it is found that the E_(con)of the former alloy steadily decreases,while the E_(con)of the latter decreases a little and fluctuates,and the corrosion rate of the former is clearly lower than that of the *** of SEM and EDX show that the corrosion product film of the former is thin,uniform,compact and rich in nickel,and the film of the latter is thick,loose and covered with numerous *** serious intergranular corrosion occurs in the underlying substrate of the *** author proposes that the intergraular corrosion results from preferential dissolution of discontinuous precipitates at grain *** addition,the protective characteristics of corrosion product films are related not only to the enrichment of nickel but also to their compactness.

关键词： Cu-Ni alloy microstructure corrosion resistance seawater corrosion potential corrosion product film

Design and evaluation of a novel biopsy needle with hemostatic function

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机械工程前沿:英文版 2023年第2期18卷 319-331页

作者： xiaolong zhu Yichi MA Xiao XIAO Liang LU Wei XIAO Ziqi ZHAO Hongliang REN Max Q.-H.MENG Department of Electronic and Electrical Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Mechanical Engineering University of CaliforniaBerkeleyBerkeleyCA 48072USA Department of Electronic Engineering The Chinese University of Hong KongHong KongChina

Biopsy is a method commonly used for early cancer ***,bleeding complications of widely available biopsy are risky for *** biopsy will result in a more accurate cancer diagnosis and a decrease in the risk of *** this article,we propose a novel biopsy needle that can reduce bleeding during biopsy procedures and achieve stable *** proposed biopsy needle features a compact structure and can be operated easily by left and right hands.A predictive model for puncture force and tip deflection based on coupled Eulerian–Lagrangian(CEL)method is *** results show that the biopsy needle can smoothly deliver the gelatin sponge hemostatic plug into the *** the hemostatic plug bends,the overall delivery process is stable,and the hemostatic plug retains in the tissue without being affected by the withdrawal of the *** experiments indicate that the specimens are well obtained and evenly distributed in the groove of the outer needle without *** proposed design of biopsy needle possesses strong ability of hemostasis,tissue cutting,and tissue *** CEL model accurately predicts the peak of puncture force and produces close estimation of the insertion force at the postpuncture stage and tip position.

关键词： cancer diagnosis biopsy needle hemostatic function predictive model coupled Eulerian−Lagrangian