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Development of land use transitions research in China

Journal of Geographical Sciences 2020年第7期30卷 1195-1214页

作者： LONG Hualou QU Yi TU Shuangshuang ZHANG Yingnan jiang yanfeng Key Laboratory of Regional Sustainable Development Modeling Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China School of Geography Geomatics and PlanningJiangsu Normal UniversityXuzhou 221116JiangsuChina Key Laboratory of Environment Change and Resources Use in Beibu Gulf Nanning Normal Universitythe Ministry of EducationNanning 530001China School of Geographical Sciences University of Nottingham NingboNingbo 315000ZhejiangChina

With the introduction of the concept of land use transition into China,related researches have been carried out extensively in the past two decades,which enrich the knowledge of land system *** paper describes the development of research on land use transitions in China from the perspectives of conceptual connotations,theoretical model,research methods,and research progress and *** the in-depth investigation of land use transitions,the concept and connotations of land use morphology are developed and encapsulated as two kinds,i.e.,dominant morphology and recessive *** dominant morphology refers to the land use structure of a certain region over a certain period of time,with features such as the quantity and spatial pattern of land use *** the recessive morphology includes the land use features in the aspects of quality,property rights,management mode,input,output and ***,the concept of land use transition is further developed,and the theoretical model of regional land use transitions is ***,three innovative integrated approaches to study land use transitions are put forward,i.e.,multidisciplinary research framework for recessive land use transition,transect and horizontal *** date,there have been 62 *** 166 *** on the topic of"land use transition"in *** 2002–2019,the National Natural Science Foundation of China has funded 48 research programs on the theme of"land use transition".As such,the Chinese scholars have adapted the concept derived from western literature to the situations and experiences in China.

关键词： land use morphology theoretical model multidisciplinary integration horizontal comparison rural restructuring rural vitalization land system science

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A New Active Gate Driver for MOSFET to Suppress Turn-Off Spike and Oscillation

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Chinese Journal of Electrical Engineering 2018年第2期4卷 43-49页

作者： yanfeng jiang Chao Feng Zhichang Yang Xingran Zhao Hong Li School of Electrical Engineering Beijing Jiaotong UniversityBeijing 100044China

MOSFETs are widely used in power electronics *** to the high di/dt and dv/dt of the MOSFET and parasitic parameters in the circuit,drain voltage spikes and oscillations will be generated during turn-off,which can affect the safety of the device and degrade the system's electromagnetic *** paper first studies the relationship between drain voltage spike and gate voltage during *** on the effect of gate voltage on drain voltage spike,a new active gate driver that optimizes gate voltage is *** proposed active gate driver detects the slope of the drain voltage and generates a positive pulse in the drain current fall phase to increase the gate voltage,thereby suppressing drain voltage spike and *** order to verify the effectiveness of the proposed active gate driver,a simulation circuit and an experimental platform are constructed and compared with the conventional gate *** and experimental results show that the new active gate driver can effectively suppress the drain voltage spike and oscillation of MOSFETs,and can effectively reduce high-frequency EMI.

关键词： Active gate driver electromagnetic interference voltage spike oscillation

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Ecological function transitions of land use in the Beibu Gulf Economic Zone from the perspective of production-living-ecological space

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Journal of Geographical Sciences 2024年第11期34卷 2212-2238页

作者： ZHOU Guipeng LONG Hualou jiang yanfeng TU Shuangshuang Key Laboratory of Regional Sustainable Development Modelling Institute of Geographic Sciences and Natural Resources ResearchCAS College of Resources and Environment University of Chinese Academy of Sciences School of Public Policy and Management Guangxi University Key Laboratory of Environment Change and Resources Use in Beibu Gulf Nanning Normal University

The ecological function of land use is the basis for developing an ecological civilization and realizing sustainable *** paper may help guide the coordination of economic development and ecological development in China’s coastal border *** on theoretical analysis,this paper studies the spatiotemporal evolution of the functional spaces and the ecological function transitions of land use in the Beibu Gulf Economic Zone(BGEZ)by analyzing patterns,processes,and factors by applying eco-environmental quality index,grid subdivision,kriging interpolation,barycenter model,and *** paper constructs a theoretical framework of ecological function transitions of land use based on the research idea of“system-pattern-process-factor”,and carries out empirical *** conclusions can be drawn as follows:(1)The ecological space in the BGEZ has continuously decreased,converting mainly into agricultural production space and industrial-mining production *** production space has expanded *** area of living space in the BGEZ has increased rapidly.(2)The ecological function of land use in the BGEZ has continued to weaken,especially in the southern part of the ***“high-sub-high”quality zones of ecological function are retreating to the north.(3)There were more deterioration transition areas than optimization transition areas of ecological function in the *** former were mostly located in the central and southern urbanized areas of the BGEZ,whereas the latter were mostly located in the edge zones of district and county units.(4)As for the driving factors of the deterioration transitions of land use ecological function in the BGEZ,the significant trend of“de-ecologization”of the land cover/land use structure was the dominant driving factor;the interactions among the“natural-socioeconomic-managerial”systems were the main recessive *** natural system played a fundamental role,and the driving force of natural factors was the st

关键词： land use transitions ecological function eco-environmental quality production-living-ecological spaces dominant and recessive factors Beibu Gulf

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A novel design of power management integrated circuit with 90 plus efficiency used in AC/DC converter

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Engineering Sciences 2010年第1期8卷 53-58页

作者： jiang yanfeng Microelectronic Center College of Information Engineering North China University of Technology Beijing 100144 China

Recently, resonant AC/DC converter has been accepted by the industry. However, the efficiency will be decreased at light load. So, a novel topology with critical controlling mode combined with resonant ones is proposed in this paper. The new topology can correspond to a 90 plus percent of power converting. So,a novel topology of an state of art integrated circuit, which can be used as power management circuit, has been designed based on the above new topology. A simulator which is specifically suitable for the power controller has been founded in this work and it has been used for the simulation of the novel architecture and the proposed integrated circuit.

关键词： power management integrated circuit converter resonance

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Power Management Integrated Circuit with 90Plus Efficiency Used in AC/DC Converter

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Energy and Power Engineering 2009年第2期1卷 100-109页

作者： yanfeng jiang 不详

Recently, resonant AC/DC converter has been accepted by the industry. However, the efficiency will be decreased at light load. So, a novel topology with critical controlling mode combined with resonant ones is proposed in this paper. The new topology can correspond to a 90 plus percent of power converting. So,a novel topology of an state of-art integrated circuit, which can be used as power management circuit, has been designed based on the above new topology. A simulator which is specific suitable for the power controller has been founded in this work and it has been used for the simulation of the novel architecture and the proposed integrated circuit.

关键词： integrated circuit power management resonant

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Alternative splicing and expression of the insulin-like growth factor (IGF-1) gene in osteoblasts under mechanical stretch

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Chinese Science Bulletin 2006年第22期51卷 2731-2736页

作者： XIAN Chengyu WANG Yuanliang ZHANG Bingbing TANG Liling PAN Jun LUO yanfeng jiang Peng LI Dajun Bioengineering College Research Center of Bioinspired Materials Science and Engineering Key Laboratory for Biomechanics & Tissue Engineering Under The State Ministry of Education Chongqing University Chongqing 400044 China

(IGF-1 ) 像胰岛素的生长因素 1 支持造骨细胞区别和骨头形成，和它的表示被机械段导致，因此， IGF-1 被认为连接机械刺激和本地织物回答的一个受动器分子。在这研究，一台机械拉长设备被设计把生理的水平静电干扰或周期的拉长刺激用... 详细信息

(IGF-1 ) 像胰岛素的生长因素 1 支持造骨细胞区别和骨头形成，和它的表示被机械段导致，因此， IGF-1 被认为连接机械刺激和本地织物回答的一个受动器分子。在这研究，一台机械拉长设备被设计把生理的水平静电干扰或周期的拉长刺激用于造骨细胞。IGF-1 mRNA 的不同 isoforms 被 RT-PCR 用各自的教材从房间放大，这些放大产品被定序。产品被发现被造骨细胞有选择地在拉长刺激下面生产的拼接的 IGF-1 的 iso 形式。ThisIGF-1 isoform 与原来在肌肉细胞被识别的 mechano 生长因素(MGF ) 有相同顺序。肝类型 IGF (***-1 ) 和在在段刺激下面的造骨细胞的 MGF 的表示的规定进一步用半量的 RT-PCR 被学习。Stretchstimulation 被发现 IGF-1 (***-1 和 MGF ) 的表示到职业人员警句，并且为两 isoformsexpression，更多被周期的段有效地比静态的段刺激。MGF 仅仅在受到机械段的造骨细胞被检测，建议 MGF 是段敏感生长因素。MGF 的表示比 ***-1 的早达到顶点，它类似于他们在肌肉的规定并且作为在肌肉房间在骨头建议了 MGF 和 ***-1 的类似的角色。在造骨细胞的 MGF 和 ***-1 的功能将被进一步试验性的研究建立。

关键词：胰岛素类生长因子-1 IGF-1 成骨细胞拉伸

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Influence of Gold Particle Size on Melting Temperature of VLS Grown Silicon Nanowire

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材料科学与工程（中英文版） 2010年第7期4卷 83-89页

作者： yanfeng jiang Yamin Zhang Microelectronic Center College of Information Engineering North China University of Technology Beo＇ing 100144 China

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Phenome-Wide Association Analysis Reveals Novel Links Between Genetically Determined Levels of Liver Enzymes and Disease Phenotypes

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Phenomics 2022年第5期2卷 295-311页

作者： Zhenqiu Liu Chen Suo yanfeng jiang Renjia Zhao Tiejun Zhang Li Jin Xingdong Chen State Key Laboratory of Genetic Engineering Human Phenome InstituteSchool of Life SciencesFudan UniversityShanghai 200438China Fudan University Taizhou Institute of Health Sciences Taizhou 225316China Key Laboratory of Public Health Safety Fudan UniversityMinistry of EducationShanghai 200032China Department of Epidemiology School of Public HealthFudan UniversityShanghai 200032China

Serum liver enzymes(alanine aminotransferase[ALT],aspartate aminotransferase[AST],λ-glutamyl transferase[GGT]and alkaline phosphatase[ALP])are the leading biomarkers to measure liver injury,and they have been reported to be associated with several intrahepatic and extrahepatic diseases in observational *** conducted a phenome-wide association study(PheWAS)to identify disease phenotypes associated with genetically predicted liver enzymes based on the UK Biobank *** and multivariable Mendelian randomization(MR)analyses were performed to obtain the causal esti-mates of associations that detected in *** PheWAS identified 40 out of 1,376 pairs(16,17,three and four pairs for ALT,AST,GGT and ALP,respectively)of genotype-phenotype associations reaching statistical significance at the 5%false discovery rate threshold.A total of 34 links were further validated in Mendelian randomization *** of the disease phenotypes that associated with genetically determined ALT level were liver-related,including primary liver cancer and alcoholic liver *** disease outcomes associated with genetically determined AST involved a wide range of phenotypic categories including endocrine/metabolic diseases,digestive diseases,and neurological *** predicted GGT level was associated with the risk of other chronic non-alcoholic liver disease,abnormal results of function study of liver,and *** determined ALP level was associated with pulmonary heart disease,phlebitis and thrombophlebitis of lower extremities,and *** findings reveal novel links between liver enzymes and disease phenotypes providing insights into the full understanding of the biological roles of liver enzymes.

关键词： Liver enzyme Disease phenotype GWAS Mendelian randomization

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A Novel Integrated Circuit Driver for LED Lighting

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Circuits and Systems 2014年第7期5卷 161-169页

作者： yanfeng jiang Dong Zhang Ming Yu Beijing Institute of Auto-Testing Technology Beijing China

A novel integrated circuit for driving LED lighting has been proposed, designed and fabricated. Besides the typical parts of LED driver, an integral part was added at the output terminal of error amplifier in the driver. In this way, a novel average current mode can be set up to take the place ordinary peak current control mode. In addition, a BUCK low-level topology was adopted, too. It can be used to drive up to eight 1 W HB LED lights with 350 mA constant current. In this way, the LED driver displays high performance, in which output current with less 1% error and total efficiency as high as 96%. The feasibility of the design has been verified by actual measurement on the fabricated chip.

关键词： LED Lighting Driver Integral Circuit Low-Level Topology

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高性能SOI基纳米硅薄膜微压阻式压力传感器的研究

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传感技术学报 2023年第6期36卷 839-848页

作者：高颖姜岩峰江南大学物联网工程学院电子工程系江苏无锡214122

针对高端领域对高性能微小量程压力传感器的迫切需求,设计并实现了一种应用于电子血压计的高性能SOI基纳米硅薄膜微压阻式压力传感器,并提出了相应的检测电路。根据小挠度弯曲理论设计了传感器方形敏感薄膜结构,确定了纳米硅薄膜压敏电... 详细信息

针对高端领域对高性能微小量程压力传感器的迫切需求,设计并实现了一种应用于电子血压计的高性能SOI基纳米硅薄膜微压阻式压力传感器,并提出了相应的检测电路。根据小挠度弯曲理论设计了传感器方形敏感薄膜结构,确定了纳米硅薄膜压敏电阻的阻值大小和尺寸。采用ANSYS有限元分析(FEA)对所设计的传感器结构进行仿真,根据仿真结果确定了压敏电阻在膜片上的最佳放置位置。基于标准MEMS制造技术,在SOI基纳米硅薄膜上设计并实现了该压力传感器。实测结果表明,室温下,在0~40 kPa微压测量范围内所设计的传感器检测灵敏度可达0.45 mV/(kPa·V),非线性度达到0.108%F.S。在-40℃~125℃的工作温度范围内,温度稳定性好,零点温度漂移系数与灵敏度温度漂移系数分别为0.0047%F.S与0.089%F.S。所设计的压力传感器及其检测电路,在现代医疗、工业控制等领域具有较大的应用潜力。

关键词： SOI基纳米硅薄膜微压阻式压力传感器检测电路有限元分析(FEA)

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