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Probability density and oscillating period of magnetopolaron in parabolic quantum dot in the presence of Rashba effect and temperature

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Chinese Physics B 2021年第11期30卷 207-213页

作者： Ying-Jie Chen feng-lan Shao School of Physics and Physical Engineering Qufu Normal UniversityQufu 273165China

We study the property of magnetopolaron in a parabolic quantum dot under the Rashba spin–orbit interaction(RSOI)by adopting an unitary transformation of Lee–Low–Pines type and the variational method of Pekar type with and without considering the *** temporal spatial distribution of the probability density and the relationships of the oscillating period with the RSOI constant,confinement constant,electron–phonon coupling strength,phonon wave vector and temperature are *** results show that the probability density of the magnetopolaron in the superposition of the ground and first excited state takes periodic oscillation(T0/period)in the presence or absence of *** of the RSOI,the oscillating period is divided into different ***,the results indicate that the oscillating period increases(decreases)when the RSOI constant,electron-phonon coupling strength and phonon wave vector(the confinement constant)increase in a proper temperature,and the temperature plays a significant role in determining the properties of the polaron.

关键词： Rashba spin-orbit interaction quantum dot polaron temperature

Duplication of 19q (13.2-13.31) associated with comitant esotropia: A case report

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World Journal of Clinical Cases 2021年第20期9卷 5526-5534页

作者： Yue-lan feng Ning-Dong Li Department of Ophthalmology National Center for Children's HealthBeijing Children’s HospitalCapital Medical UniversityBeijing 100045China Department of Ophthalmology First Hospital Affiliated to Baotou Medical CollegeBaotou 014010Inner Mongolia Autonomous RegionChina

BACKGROUND Comitant esotropia is the most common form of *** is caused by heterogeneous environmental and genetic risk *** pure duplication of the long arm of chromosome 19 is a rare *** 8 patients with partial trisomy of the long arm of chromosome 19q have been reported to ***,we describe a girl with pure duplication of 19q,who was diagnosed with congenital esotropia,microcephaly,and gallbladder *** SUMMARY The patient was diagnosed with esotropia when she was *** Krimsky method showed+50 prism diopters in the primary gaze *** additional abnormal findings were observed following slit lamp and fundus examination,but the features of the full-field electroretinogram showed a decreased amplitude and increased implicit *** resonance imaging showed ventriculomegaly with thinning of the corpus callosum and splenium in her brain.A 4.42 Mb mosaic duplication within 19q13.2-q13.31 region(chr19:39,343,725 to 43,762,586)was detected by microarray comparative genomic *** Strabismus is reported in many live borns with pure duplication of *** important clinical characteristic indicates that the candidate genes fundamental for this phenotype may be narrowed to genes within the 19q13.3-q13.31 *** were two candidate genes observed that may contribute to the comitant esotropia phenotype,namely XRCC1(19:43,543,311)and SMG9(19:43,727,991).

关键词： Duplication 19q Esotropia Strabismus XRCC1 SMG9 Case report

Cable coupling response in metal cavity under X-ray irradiation

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Nuclear Science and Techniques 2024年第10期35卷 110-120页

作者： Mao-Xing Zhang lan-feng Yuan Cui Meng Yi-Nong Liu Department of Engineering Physics Tsinghua UniversityBeijing 100084China College of Electrical Engineering Zhejiang UniversityHangzhou 310007China Laboratory of Particle and Radiation Imaging Ministry of EducationBeijing 100084China

This study investigates the coupling response of cables inside a metal cavity under X-ray irradiation using the finite-difference time-domain method,particle simulation method,and transmission-line equation to solve the electromagnetic field inside the cavity and load voltage at the cable terminal under X-ray *** results show that under a strong ionizing radiation environment of 1 J/cm^(2),a strong electromagnetic environment is generated inside the *** cable shielding layer terminal couples a voltage of 15.32 V,whereas the core wire terminal couples a voltage of 0.31 *** strong X-ray irradiation,the metal cavity not only fails to provide electromagnetic shielding,but also introduces new electromagnetic *** study also provides a method for reducing the number of emitted electrons by adding low-Z materials,which can effectively reduce the coupled electric field and voltage.

关键词： Ionizing radiation Metal cavity System-generated electromagnetic pulse Transmission-line model

A VO_(2) film-based multifunctional metasurface in the terahertz band

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Chinese Optics Letters 2022年第1期20卷 167-173页

作者： Ziyu Liu Limei Qi feng lan Chuwen lan Jun Yang Xiang Tao School of Electronic Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China The Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001China Shenzhen Research Institute Beijing University of Posts and TelecommunicationsShenzhen 518000China School of Information and Communication Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China

We proposed a multifunctional terahertz metasurface based on a double L-shaped pattern and a vanadium dioxide(VO_(2)) film separated by *** the VO_(2)film is an insulator,a dual-band electromagnetically induced transparency effect is obtained,and the physical mechanism is investigated based on the current distribution and "two-particle" *** the VO_(2)film is a metal,a dual-band linear-to-circular polarization converter,in which the y-polarized linear wave can be effectively converted to left-handed circularly polarized(LCP) and right-handed circularly polarized simultaneously in different bands,can be *** arranging the metal pattern rotating 30°,a multifunctional antenna can be *** the VO_(2)is an insulator,the radiation of the LCP wave is divided into four beams,with two beams reflected and two beams *** the VO_(2)is in the metallic state,we can only get the co-polarized reflected wave with a 21° ***,in our design,the VO_(2)film does not need lithography to obtain certain patterns,which improves the convenience of fabrication and *** design opens a new way for the development of multifunctional terahertz devices and has potential applications in the terahertz communication field.

关键词： terahertz VO_(2) antenna metasurface

Characterization of Gallic Acid Interaction with Human Serum Albumin by Spectral and Molecular Modeling Methods

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Chemical Research in Chinese Universities 2012年第2期28卷 287-290页

作者： LIU Zuo-jia LI Dan NIU feng-lan School of Public Health Jilin UniversityChangchun 130021P.R.China

The binding of drugs with human serum albumin（HSA） is a crucial factor influencing the distribution and bioactivity of drugs in the *** understand the action mechanisms between gallic acid（GA,3,4,5-trihydroxybenzoic acid） and HSA,the binding of GA with HSA was investigated by a combined experimental and computational *** fluorescence properties of HSA and the binding parameters of GA collectively indicate that the binding is characterized by static quenching mechanism at one high affinity binding *** to the estimated molecular distance between the donor（HSA） and the acceptor（GA）,the binding is related to the fluorescence resonance energy *** indicated by the thermodynamic parameters,hydrophobic interaction plays a major role in the GA-HSA ***,the experimental results reveal that GA is bound in the large hydrophobic cavity of subdomain IIA in the site I of HSA,which is well approved by molecular docking.

关键词： Gallic acid Human serum albumin Fluorescence quenching Molecular modeling

Study and Application of Heat Treat ment of Multi-Element Wear-Resistant Low-Alloy Steel

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Journal of Iron and Steel Research International 2006年第1期13卷 57-61页

作者： JIANG Zhi-qiang DU Jian-ming feng Xi-lan Department of Industrial Engineering Zhengzhou Institute of Aeronautics Zhengzhou 450015 Henan China School of Engineering and Technology Shenzhen University Shenzhen 518060 Guangdong China

The effects of heat treatment on the properties of multi element wear-resistant low-alloy steel （MLAWS） which is used to make the liner of rolling mill torus were researched. The results show that when quenching temperature is lower than 900℃, the hardness increases with the increase of temperature, and when quenching temperature is higher than 900℃, the hardness decreases with the increase of temperature. As quenching temperature is lower than 920℃, the effect of quenching temperature on the impact toughness is not obvious. When quenching temperature is higher than 920℃ , impact toughness decreases with the increase of temperature. When tempering temperature is higher than 450 ℃ , the hardness begins to decrease obviously. After tempering at 350℃, the best wear resistance was obtained. According to the service condition of rolling mill torus liner, the MLAWS is quenched from 900-920 ℃ and tempered at 350-370℃.

关键词： rolling mill torus liner heat treatment mechanical property wear resistance

Analyzing the spatial patterns and drivers of ecosystem services in rapidly urbanizing Taihu Lake Basin of China

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Frontiers of Earth Science 2015年第3期9卷 531-545页

作者： Junyong AI Xiang SUN lan feng Yangfan LI Xiaodong ZHU State Key Laboratory of Pollution Control and Resources Reuse School of the Environment Nanjing University Nanjing 210046 China Marine Science Research Institute Nanjing University Nanjing 210()93~ China Key Laboratory of Coastal and Wetland Ecosystems (Ministry of Education) College of theEnvironment & Ecology Xiamen University Xiamen 361102 China

Quantifying and mapping the distribution patterns of ecosystem services can help to ascertain which services should be protected and where investments should be directed to improve synergies and reduce trade- offs. Moreover, the indicators of urbanization that affect the provision of ecosystem services must be identified to determine which approach to adopt in formulating policies related to these services. This paper presents a case study that maps the distribution of mukiple ecosystem services and analyzes the ways in which they interact. The relationship between the supply of ecosystem services and the socio-economic development in the Taihu Lake Basin of eastern China is also revealed. Results show a significant negative relationship between crop production and tourism income （p 〈 0.005） and a positive relationship between crop production, nutrient retention, and carbon sequestration （p 〈 0.005）. The negative effects of the urbanization process on providing and regulating services are also identified through a comparison of the ecosystem services in large and small cities. Regression analysis was used to compare and elucidate the relative significance of the selected urbanization factors to ecosystem services. The results indicate that urbanization level is the most substantial factor inversely correlated with crop production （R2 = 0.414） and nutrient retention services （R2 = 0.572）. Population density is the most important factor that negatively affects carbon sequestration （R2 = 0.447）. The findings of this study suggest the potential relevance of ecosystem service dynamics to urbanization management and decision making.

关键词： Taihu Lake Basin ecosystem service rapid urbanization spatial pattern drivers

Exploring coupling coordination between urbanization and ecosystem quality （1985-2010）： a case study from Lianyungang City, China

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Frontiers of Earth Science 2016年第3期10卷 527-545页

作者： Junyong AI lan feng Xiaowei DONG Xiaodong ZHU Yangfan LI State Key Laboratory of Pollution Control and Resources Reuse School of the Environment Nanjing University Nanjing 210046 China Key Laboratory of Coasial and Wetland Ecosystems (Ministry of Education) College of the Environment and Ecology Xiamen University Xiamen 361102 China The Key Laboratory of the Coastal Zone Exploitation and Protection Ministry of Land and Resource Nanjing 210008 China Jiangsu Province Center for Environmental Science and Engineering Nanjing 210036 China

Urbanization processes affect the ecosystem through alterations in ecological functions and landscape patterns. Currently, analysis of the total ecosystem services value （ESV） has targeted the overall benefits which human beings obtain from the regional ecosystem but does not generally include information regarding ecological struc- tures and patterns. Therefore, the results cannot reflect the comprehensive state of the local ecosystem. We propose a new, integrative ecosystem quality indicator based on the ESV and landscape metrics for evaluating the quality of the regional ecosystem. We adopted the method of a coupled degree of coordination for evaluating the interrelationship between urbanization and ecosystem quality in Lianyun- gang City from 1985 to 2010. The coupling degree of coordination between urbanization and ecosystem quality showed an inverse U-shaped curve. At the primary stage of urbanization （1985-1995）, the degree of coupling of urbanization and the ecosystem was just barely balanced. From 1995 until 2000, the coupling system reached a balanced condition, in which the urbanization level increased. Since 2000, the urbanization process has accelerated. The coordination between urbanization and the ecosystem achieved the optimum condition in 2005. A turning point appeared at the same time, and the degree of coupling coordination began falling from the optimum. Subsequently, the coupled system once more entered a barely balanced state. Overall, the comprehensive level of ecosystem quality decreased since 1985 and degraded sharply after 2005, suggesting an overall degradation of the local ecosystem quality.

关键词： urbanization ecosystem services value landuse change landscape metrics ecosystem quality

Experimental Investigation on Cooling/Heating Characteristics of Ultra-Thin Micro Heat Pipe for Electric Vehicle Battery Thermal Management

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Chinese Journal of Mechanical Engineering 2018年第3期31卷 179-188页

作者： Fei-Fei Liu feng-Chong lan Ji-Qing Chen Yi-Gang Li School of Mechanical&Automotive Engineering Guangdong Key Laboratory of Automotive EngineeringSouth China University of Technology School of Mechatronics&Vehicle Engineering East China Jiaotong UniversityNanchang 330013China

Due to the heat pipes’ transient conduction,phase change and fluid dynamics during cooling/heating with high frequency charging/discharging of batteries,it is crucial to investigate in depth the experimental dynamic thermal characteristics in such complex heat transfer processes for more accurate thermal analysis and design of a BTMS. In this paper,the use of ultra?thin micro heat pipe(UMHP) for thermal management of a lithium?ion battery pack in EVs is explored by experiments to reveal the cooling/heating characteristics of the UMHP pack. The cooling performance is evaluated under di erent constant discharging and transient heat inputs conditions. And the heating e ciency is assessed under several sub?zero temperatures through heating films with/without UMHPs. Results show that the pro?posed UMHP BTMS with forced convection can keep the maximum temperature of the pack below 40 °C under 1 ~ 3 C discharging,and e ectively reduced the instant temperature increases and minimize the temperature fluctuation of the pack during transient federal urban driving schedule(FUDS) road conditions. Experimental data also indicate that heating films stuck on the fins of UMHPs brought about adequate high heating e ciency comparing with that stuck on the surface of cells under the same heating power,but has more convenient maintenance and less cost for the BTMS. The experimental dynamic temperature characteristics of UMHP which is found to be a high?e cient and low?energy consumption cooling/heating method for BTMSs,can be performed to guide thermal analysis and optimiza?tion of heat pipe BTMSs.

关键词： Electric vehicle Lithium?ion battery Thermal management Ultra?thin micro heat pipe