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Influence of baryons on the spatial distribution of matter:higher order correlation functions

Research in Astronomy and Astrophysics 2012年第12期12卷 1603-1612页

作者： xiao-jun Zhu jun Pan Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 China National Astronomical Observatories Chinese Academy of Sciences B eijing 100012 China

Physical processes involving baryons could leave a non-negligible imprint on the distribution of cosmic matter.A series of simulated data sets at high resolution with identical initial conditions are employed for count-in-cell analysis,including one N-body pure dark matter run,one with only adiabatic gas and one with dissipative *** and higher order cumulants Sn of dark matter and gas are *** is found that physical processes with baryons mainly affect distributions of dark matter at scales less than 1 h-1 *** comparison with the pure dark matter run,adiabatic processes alone strengthen the variance of dark matter by～10%at a scale of 0.1 h-1 Mpc,while the Sn parameters of dark matter only mildly deviate by a few *** dissipative gas run does not differ much from the adiabatic run in terms of variance for dark matter,but renders significantly different Sn parameters describing the dark matter,bringing about a more than 10%enhancement to S3 at 0.1 h-1 Mpc and z=0 and being even larger at a higher *** patterns of gas in two hydrodynamical simulations are quite *** of gas at z=0 decreases by～30%in the adiabatic simulation but by～60%in the nonadiabatic simulation at 0.1 h-1 *** attenuation is weaker at larger scales but is still obvious at～10 h-1 *** parameters of gas are biased upward at scales 〈～4 h-1 Mpc,and dissipative processes show an～84%promotion at z=0 to S3 at 0.1 h-1 Mpc in contrast with the～7%change in the adiabatic *** segregation in clustering between gas and dark matter could have dramatic implications on modeling distributions of galaxies and relevant cosmological applications demanding fine details of matter distribution in a strongly nonlinear regime.

关键词： cosmology:dark matter-large-scale structure of universe-methods: statistical

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Research on the Novel Double-Layer Multi-cavity Filter

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Chinese Journal of Electronics 2019年第4期28卷 878-883页

作者： zeng Liuxing LIN Fumin xiao Yujie XIE Zhenxiong Guangdong University of Technology

A novel structure cavity filter, crosscoupled multi-cavity filter with double-layer structure is proposed. The transmission zero of cross coupling is analyzed qualitatively and quantitatively, while some of the design experience of simulation modeling are summed up and the magnetic coupling and electric coupling of synchronously tuned coupling resonators with double-layer structure are studied. Simulation and experimental results show that the cross-coupled multi-cavity filter with doublelayer structure not only can meet the high selectivity requirements, but also save space, which is conducive to miniaturization design. The feasibility, practicability and superior performance of the double-layer multi-cavity filter are fully verified by the experimental samples and the measurement results of the six-pole double-layer base station filter processed by the design model.

关键词： Cavity filter Double-layer multi-cavity filter Base station filter Double-layer cross-coupling filter

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湖南省醴陵市与衡南县农村外来媳妇艾滋病流行情况分析

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实用预防医学 2010年第3期17卷 473-475页

作者：杨晓希郑军曾红雨钟丽霞张思平湖南省醴陵市疾病预防控制中心湖南醴陵412200 湖南省疾病预防控制中心

目的探讨湖南省人口流动/迁移对艾滋病流行态势的影响,了解外来媳妇的HIV感染状况。方法用问卷形式和血清学检测的方法对醴陵市与衡南县外来媳妇进行调查,了解外来媳妇的行为特征、HIV感染情况及艾滋病防治知识的知晓率情况,并以同样的... 详细信息

目的探讨湖南省人口流动/迁移对艾滋病流行态势的影响,了解外来媳妇的HIV感染状况。方法用问卷形式和血清学检测的方法对醴陵市与衡南县外来媳妇进行调查,了解外来媳妇的行为特征、HIV感染情况及艾滋病防治知识的知晓率情况,并以同样的方法调查部分本地媳妇做对比。结果醴陵市共调查1000名外来媳妇,1000名本地媳妇;衡南县共调查1001名外来媳妇,1000名本地媳妇,两地外来媳妇中共发现3例HIV阳性患者,两地本地媳妇中共发现2例HIV阳性患者;两地外来媳妇与本地媳妇知晓率最高的问题是共用针具吸毒会感染艾滋病,占87.0%与84.3%,最低的问题是同桌吃饭会不会感染艾滋病,知晓率为37.5%与36.8%,对比差异无统计学意义(P>0.05)。结论虽然两者间HIV感染的风险差异无统计学意义,但是应该密切注意艾滋病疫情较严重地区女性的流动和加强艾滋病防治知识的教育。

关键词：外来媳妇艾滋病现患率知晓率

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Mineralogical Characterization of a Polymetallic Sulfide Ore to Improve Silver Recovery

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Journal of Wuhan University of Technology(Materials Science) 2017年第3期32卷 501-507页

作者：陈代雄 xiao jun School of Minerals Processing and Bioengineering Central South University Hunan Provincial Key Laboratory of Complex Copper Lead Zinc Associated Metal Resources Comprehensive Utilization Hunan Research Institute for Non-ferrous Metals

Based on the mineralogical characterization for the polymetallic sulfide ore, the way to improve silver recovery was studied. The results showed that silver was the most valuable metal whose grade was 448.82 g/t Ag, while 0.118% Cu, 1.65% Pb and 1.06% Zn may be comprehensively utilizated. The main silver-bearing minerals were argent and aregentite which accounted for 87.18% of total silver. Argentite and other metal minerals were distributed in the gangue minerals in complex forms. Argentite grains of 33.76% minus 50 μm indicated that a fine grinding scheme was necessary to enhance the degree of dissociation, and meanwhile selective grinding must be considered to prevent a complete grinding of coarse grains. The optimum regrinding fineness in the Cu flotation was determined as 73% minus 37 μm, while grains of 68.5% minus 74 μm in one-stage grinding remained unchanged as much as possible. Consequently, silver recovery increased to 2.68%, as well as the content of Pb simultaneously decreased from 7.26% to 2.68% in the Cu concentrate. From the lead pyrometallurgical point of view, recovering larger amounts of silver and lead at the expense of decreasing the grade of lead to a suitable level is not only economically viable for the plant, but also convenient for subsequent processing. Silver and lead recovery increased to 13.18% and 12.58%, respectively, while the Pb grade decreased from 53.1% to 46.12% for the Pb concentrate.

关键词： polymetallic sulfide ore mineralogy characterization regrinding silver recovery

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Numerical studies of the hydrodynamic damping of a vibrating hydrofoil in torsional mode

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Journal of Hydrodynamics 2021年第2期33卷 347-360页

作者： Yong-shun zeng Zhi-feng Yao Biao Huang Fu-jun Wang Qin Wu Ruo-fu xiao Guo-yu Wang College of Water Resources and Civil Engineering China Agricultural UniversityBeijing 100083China Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System Beijing 100083China School of Mechanical and Vehicular Engineering Beijing Institute of TechnologyBeijing 100081China

The vortex-induced vibration may lead to a premature failure of hydraulic mechanical systems,especially under the resonance condition in the torsional *** predict the structural fatigue life,a careful consideration of the dynamic response to the hydraulic excitations is essential in the design *** study focuses on the numerical investigation of the relationship between the flow velocity,the added mass and the hydrodynamic damping,particularly,with respect to a Donaldson-type hydrofoil,vibrating in the first torsional mode.A two-way fluid-structure interaction(FSI)method is used to predict above two *** flow velocity is in the range of 0 m/s-20m/*** evaluate the hydrodynamic damping ratio,an identification method is proposed,based on a modified version of the logarithmic decay *** relative deviations of the simulated natural frequencies and hydrodynamic damping ratios as compared with the experimental data for the first torsional modes,are within 8.1%and 16.6%,*** analysis results show that the added mass coefficient for the first torsional mode is in the range of 1.59-1.86,and is around 44%of that for the first bending *** trends of the boundary layer thickness and the wake width against the reduced velocity are found to be opposite to that of the hydrodynamic damping *** theoretical equation for predicting the hydrodynamic damping ratio is modified,which is shown to be more reliable due to its consideration of the velocity independent hydrodynamic damping phase.

关键词： Torsional mode hydrodynamic damping added mass hydrofoil Donaldson trailing edge

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A gravity heat pipe for high voltage vacuum interrupter

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第9期10卷 1305-1312页

作者： xiao-ling YU Zhi-yuan LIU Quan-ke FENG Yi-jiang WEI Ji-mei WANG Xiang-jun zeng School of Energy and Power Engineering Xi 'an Jiaotong University Xi 'an 710049 China School of Electrical Engineering Xi'an Jiaotong University Xi 'an 710049 China

To enhance nominal current of high voltage vacuum circuit breakers （VCBs）, a gravity heat pipe was proposed to replace stationary conducting rod of a high voltage vacuum interrupter. The heat pipe is composed of two coaxis tubes： the external tube is made of oxygen-free copper and the inner tube is made of stainless steel. The bottom end of the inner stainless steel tube is connected to the external copper tube by holes. Transient and static thermal performance of the heat pipe was measured, and the thermal resistance of it was compared with that of a solid copper rod with the same dimensions. Experimental results showed that thermal resistance of the heat pipe was about 1/3 of that of the copper rod, and it decreased slightly with the rising of the input heat flux. 3D thermal simulation on a 126 kV/2000 A single break VCB was done to compare the thermal performance between the proposed gravity heat pipe and the copper rod serving as the stationary conducting rod of the vacuum interrupter. Simulation results revealed that in the heat pipe case, the maximum temperature between contacts was 67 ℃ lower than that in the copper rod case.

关键词： Heat pipe Vacuum circuit breakers (VCBs) Vacuum interrupters Nominal current Thermal simulation

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Bioinspired nanomaterials for wearable sensing and human–machine interfacing

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Nano Research 2024年第2期17卷 445-461页

作者： Vishesh Kashyap junyi Yin xiao xiao jun Chen Department of Bioengineering University of CaliforniaLos AngelesLos AngelesCA 90095USA Department of Mechanical and Aerospace Engineering University of CaliforniaLos AngelesLos AngelesCA 90095USA

The inculcation of bioinspiration in sensing and human–machine interface(HMI)technologies can lead to distinctive characteristics such as conformability,low power consumption,high sensitivity,and unique properties like self-healing,self-cleaning,and *** sensing and HMI are fields rife with opportunities for the application of bioinspired nanomaterials,particularly when it comes to wearable sensory systems where biocompatibility is an additional *** review discusses recent development in bioinspired nanomaterials for wearable sensing and HMIs,with a specific focus on state-of-the-art bioinspired capacitive sensors,piezoresistive sensors,piezoelectric sensors,triboelectric sensors,magnetoelastic sensors,and electrochemical *** also present a comprehensive overview of the challenges that have hindered the scientific advancement in academia and commercialization in the industry.

关键词： bioinspired nanomaterials human–machine interface wearable sensors wearable bioelectronics

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Evaluation of sensory function and recovery after replantation of fingertips at ZoneⅠin children

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Neural Regeneration Research 2017年第11期12卷 1911-1917页

作者： Zhao-wei Zhu xiao-yan Zou Yong-jun Huang Jiang-hui Liu Xi-jun Huang Bo He zeng-tao Wang Department of Plastic Surgery the First Affiliated Hospital of Sun Yat-sen University Guangzhou Guangdong ProvinceChina Department of Orthopedics and Microsurgery the First Affiliated Hospital of Sun Yat-sen UniversityGuangzhouGuangdong ProvinceChina Department of Neurology the First Affiliated Hospital of Sun Yat-sen UniversityGuangzhouGuangdong ProvinceChina Department of Orthopedics Guangdong Second Provincial General HospitalGuangzhouGuangdong ProvinceChina Department of Emergency the First Affiliated Hospital of Sun Yat-sen UniversityGuangzhouGuangdong ProvinceChina Department of Hand and Foot Surgery Provincial Hospital Affiliated to Shandong UniversitylinanShandong ProvinceChina

Sensory function is the most significant criterion when evaluating the prognosis of replanted fingers. Current clinical research has focused on surgical techniques and indications for finger replantation; however, few studies have focused on recovery of finger sensory function af- ter replantation. This study retrospectively assessed data of eight patients who had undergone nine Zone I replantations of the fingertips in the First Affiliated Hospital of Sun Yat-sen University of China from July 2014 to January 2016. Variations in the extent of damage, with the residual vessels or nerves in some fingers being too short or even missing, prevented tension-free suture repair in some patients. Thus, re- pair of four of the nine fingertips included arteriovenous anastomosis, the remaining five undergoing arterial anastomosis during replanta- tion of the amputated fingers. Three patients underwent nerve repair, whereas the remaining six cases did not. Fingertip replantations were successful in all eight patients. Compared with the patients without vascular anastomosis, no obvious atrophy was visible in the fingertips of patients who did undergo vascular anastomosis during replantation and their sensory function did recover. Fingertip replantation pro- vides good sensory function and cosmetic outcomes when good artery and vein anastomoses have been created, even when digital nerves have not been repaired.

关键词： nerve regeneration fingertip replantation neurological function microsurgery hand surgery anatomy plastic surgery blood vessels neural regeneration

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Van der Pauw Hall Measurement on Intended Doped ZnO Films for p-Type Conductivity

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Chinese Physics Letters 2010年第6期27卷 171-174页

作者： GUO Yang LIU Yao-Ping LI jun-Qiang ZHANG Sheng-Li MEI zeng-Xia DU xiao-Long Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190

A Van der Pauw Hall measurement is performed on the intended doped ZnO films （Na doped ZnO） grown by using the molecular beam epitaxial method. All as-grown samples show n-type conductivity, whereas the annealed samples （annealing temperature 900℃） show ambiguous carrier conductivity type （n- and p-type） in the automatic Van der Pauw Hall measurement. A similar result has been observed in Li doped ZnO and in as-doped ZnO films by other groups before. However, by tracing the Hall voltage in the Van der Pauw Hall measurement, it is found that this alternative appearance of both n- and p-type conductivity is not intrinsic behavior of the intended doped ZnO films, but is due to the persistent photoconductivity effect in ZnO. The persistent photoconductivity effect would strongly affect the accurate determination of the carrier conductivity type of a highly resistive intended doped ZnO sample.

关键词： Doping Sampling Films Packaging materials Measurement

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Tunneling of Dirac Particles from Kaluza-Klein Black Hole

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Communications in Theoretical Physics 2009年第5期51卷 849-852页

作者： zeng xiao-Xiong LI Qiang Department of Physics and Engineering Technology Sichuan University of Arts and Science Dazhou 635000 China

Applying the fermions tunneling method, proposed by Kerner and Mann recently, we discuss the tunneling characteristics of Dirac particles from the stationary Kaluza-Klein black hole. To choose Gamma matrix conveniently and avoid the ergosphere dragging effect, we perform it in the dragging coordinate frame. The result shows that Hawking temperature in this case also can be reproduced by the general Dirac equation.

关键词： Hawking radiation Dirac particles tunneling Kaluza Klein black hole

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