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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

Disordered Translocation is Hastening Local Extinction of the Chinese Giant Salamander

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Asian Herpetological Research 2021年第3期12卷 271-279页

作者： Guocheng SHU Ping LIU Tian zhao Cheng LI Yinmeng HOU Chunlin zhao Jie WANG Xiaoxiao SHU jiang CHANG Jianping jiang feng XIE CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province Chengdu Institute of BiologyChinese Academy of SciencesChengdu 610041SichuanChina Yibin University Yibin 644000SichuanChina University of Chinese Academy of Sciences Beijing 100049China Sichuan University Chengdu 610065SichuanChina State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China

Biodiversity is declining globally by an unprecedented extinction *** is especially true for amphibians,accounting for 24.3%of all threatened *** the largest extant amphibian species in the world,wild populations of the Chinese giant salamander(Genus Andrias)(CGS)have decreased dramatically because of overexploitation and habitat *** has become an important strategy for restoring threatened wild populations ***,disordered tra nsloca tion usually has negative effects on the native *** provide an overview of CGS translocation and show that disordered translocation can increase local population *** four times the estimated number of wild individuals have been released across *** a re three types of translocation used for CGS,namely,reinforcement,reintroduction and ecological replacement,the last of which accounts for over one-third of *** genetic screening revealed that most released individuals were not from local populations,with one to four lineages detected in every release site(n=6).This disordered translocation can potentially reduce the genetic integrity of original ***,we suggest suspending current CGS translocation activities immediately,until more robust measures can be developed and implemented to improve the current translocation program,especially with respect to lineage identifica tion a nd the identifica tion of appropriate release sites.

关键词： Chinese giant salamander genetic test translocation conservation wild population

Activity of Recombinant Human Interleukin-15 against Tumor Recurrence and Metastasis in Mice

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Cellular & Molecular Immunology 2008年第3期5卷 189-196页

作者： feng Tang Luting zhao Yan jiang Denian Ba Lianxian Cui Wei He Department of Immunology Institute of Basic Medical Sciences Chinese Academy of Medical Science ＆ School of Basic Medicine Peking Union Medical College Beijing 100005 China Department of Immunology Institute of Basic Medical Sciences Chinese Academy of Medical Science ＆ School of Basic Medicine Peking Union Medical College 5 Dong Dan San Tiao Beijing 100005 China.

Transplantable experimental tumor models were constructed to study the activities of recombinant human interleukin-15 （rhIL-15） against tumor recurrence and metastasis. The results showed that tumor nodule formation was retarded and tumor growth was inhibited in the subcutaneous tumor model of LA795 lung adenocarcinoma after treatment with rhIL-15, and the survival rate of T739 tumor-bearing mice treated with rhIL-15 was much higher than that of mice treated with either saline or with the same dose of rhIL-2. This indicats that rhIL-15 had better antitumor effect than rhIL-2 at the same dose level. In some rhIL-15 treated mice, the tumor cells inoculated subcutaneously were eradicated and there was no tumor formation even 138 days after tumor cell inoculation. The tumor-free mice were rechallenged with live tumor cells and no tumor reoccurred in the following two months in all of these mice, indicating that long-lasting antitumor systemic immunity developed. It was also shown that tumor recurrence and metastasis were inhibited markedly after treatment with rhIL-15, but not with the same dose of rhIL-2, in both subcutaneously and intravenously disseminated tumor models of LA795 lung adenocarcinoma. Simultaneously, the CTL and NK cell activities of the splenocytes obtained from tumor-bearing mice that had been treated with either rhIL-15 or rhIL-2 were both markedly enhanced. However, the enhancement of CTL and NK cell activities was more significant in rhIL-15 treated mice than that in rhIL-2 treated mice. This suggests that the anti-tumor effect of rhIL-15 in vivo was achieved by enhancing the CTL and NK cell activities in tumor immune response.

关键词： rhIL-15 LA795 transplantable experimental tumor model recurrence metastasis

Correlation analyse between thyroid hormone levels and severity of schizophrenia symptoms

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World Journal of Psychiatry 2025年第1期15卷 63-71页

作者： Qi-Hui jiang Wei-Dong Gong Department of Endocrinology and Metabolism Hengyang Central HospitalHengyang 421000Hunan ProvinceChina Breast Tumor Surgical Outpatient Hengyang Central HospitalHengyang 421000Hunan ProvinceChina

BACKGROUND The imbalance of hormone levels in the body is closely related to the occurrence and progression of schizophrenia,especially thyroid *** To study the relationship between triiodothyronine(T3),thyroxine(T4),free T3(FT3),free T4(FT4),thyroid stimulating hormone(TSH)and *** In this study,100 schizophrenia patients were selected from our hospital between April 2022 and April *** clinical data were analyzed *** on the Positive and Negative Syndrome Scale(PANSS)score,patients were divided into mild(1-3 points,n=39),moderate(4 points,n=45),and severe groups(5-7 points,n=16).Additionally,55 healthy individuals served as a control *** blood samples were collected to measure T3,T4,FT3,FT4,TSH,and cortisol concentrations,analyzing their relationship with PANSS *** The serum levels of T3,FT3,FT4,TSH and cortisol in the schizophrenia group were lower than those in the control group(P<0.05).With the increase of the severity of the disease,the concentrations of T3 and T4 decreased,while the con-centrations of TSH and cortisol increased(P<0.05).The concentrations of TSH and cortisol were positively correlated with the PANSS score,while T3 and T4 were negatively correlated with the PANSS score(P<0.05).The receiver ope-rating characteristic curve results showed that T3,T4,TSH,and cortisol had good efficacy in the diagnosis of *** results showed that decreased T3 level,decreased T4 level,decreased TSH level and increased cortisol level may be independent risk factors for *** Thyroid hormone levels are associated with the severity of schizophrenia symptoms,which can provide new solutions for the diagnosis and treatment of schizophrenia.

关键词： Thyroid hormone Schizophrenia Symptom severity Positive and Negative Syndrome Scale score Cortisol

Description of a New Species of Amolops Cope, 1865(Amphibia: Ranidae) from Nepal and Nomenclatural Validation of Amolops nepalicus Yang, 1991

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Asian Herpetological Research 2020年第2期11卷 71-94页

作者： Janak Raj KHATIWADA Guocheng SHU Bin WANG Tian zhao feng XIE Jianping jiang CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province Chengdu Institute of BiologyChinese Academy of SciencesChengdu 610041China

A new species,Amolops mahabharatensis ***.,is described from Mahabharat range(middle mountain)of *** new species is a member of the *** group and is distinguished from its congeners using morphological and molecular *** new species is diagnosed by having numerous warts on dorsum and flanks,dorsal body greyish olivebrown/light brown,presence of vomerine teeth series,presence of a pair of subgular vocal sacs in males and tadpole withⅢ:5+5/1+1:Ⅱ–labial tooth *** addition,evidenced by the phylogenetic and morphological analyses in this study,Amolops nepalicus is shown to be a valid species.A molecular phylogenetic analysis based on 16 S ribosomal gene for six members of the *** group suggested that the new species is sister to a clade containing *** and *** uncorrected genetic divergences between the new species and its closest congeners ***,*** and *** based on 16 S rRNA gene were 10.5%,11.6%,and 8.6%*** new species showed wide distribution in the Mahabharat range of Nepal.

关键词： A.marmoratus group mahabharat range molecular phylogeny taxonomy

Motivic Milnor Fibre of Cyclic L∞-algebras

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Acta Mathematica Sinica,English Series 2017年第7期33卷 933-950页

作者： Yun feng jiang Department of Mathematics University of Kansas405 Snow Hall 1460 Jayhawk BlvdLawrence KS 66045USA

Abstract We define the motivic Milnor fiber of cyclic L∞-algebras of dimension three using the method of Denef and Loeser of motivic integration. It is proved by Nicaise and Sebag that the topo- logical Euler characteristic of the motivic Milnor fiber is equal to the Euler characteristic of the étale cohomology of the analytic Milnor fiber. We prove that the value of Behrend function on the germ moduli space determined by a cyclic L∞-algebra L is equal to the Euler characteristic of the analytic Milnor fiber. Thus we prove that the Behrend function depends only on the formal neighborhood of the moduli space.

关键词： L∞-algebra motivic Milnor fiber analytic Milnor fiber Donaldson Thomas invariants,the Behrend function

Ultra‑High Sensitivity Anisotropic Piezoelectric Sensors for Structural Health Monitoring and Robotic Perception

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Nano-Micro Letters 2025年第2期17卷 432-446页

作者： Hao Yin Yanting Li Zhiying Tian Qichao Li Chenhui jiang Enfu Liang Yiping Guo State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Beijing Vacuum Electronics Research Institute Beijing 100015People’s Republic of China Fundamental Science On Vibration Shock and Noise LaboratoryState Key Laboratory of Mechanical System and VibrationSchool of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

Monitoring minuscule mechanical signals,both in magnitude and direction,is imperative in many application scenarios,e.g.,structural health monitoring and robotic sensing ***,the piezoelectric sensor struggles to satisfy the requirements for directional recognition due to the limited piezoelectric coefficient matrix,and achieving sensitivity for detecting micrometer-scale deformations is also ***,we develop a vector sensor composed of lead zirconate titanate-electronic grade glass fiber composite filaments with oriented arrangement,capable of detecting minute anisotropic *** as-prepared vector sensor can identify the deformation directions even when subjected to an unprecedented nominal strain of 0.06%,thereby enabling its utility in accurately discerning the 5μm-height wrinkles in thin films and in monitoring human pulse *** ultra-high sensitivity is attributed to the formation of porous ferroelectret and the efficient load transfer efficiency of continuous lead zirconate titanate ***,when integrated with machine learning techniques,the sensor’s capability to recognize multi-signals enables it to differentiate between 10 types of fine textures with 100%*** structural design in piezoelectric devices enables a more comprehensive perception of mechanical stimuli,offering a novel perspective for enhancing recognition accuracy.

关键词： Flexible piezoelectric filaments Anisotropic Ultra-high sensitivity Structural health detection Texture recognition

Reentry trajectory optimization for hypersonic vehicle satisfying complex constraints

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Chinese Journal of Aeronautics 2013年第6期26卷 1544-1553页

作者： jiang zhao Rui Zhou School of Automation Science and Electrical Engineering Beihang University

The reentry trajectory optimization for hypersonic vehicle（HV）is a current problem of great *** complex constraints,such as waypoints for reconnaissance and no-fly zones for threat avoidance,are inevitably involved in a global strike *** the many direct methods,Gauss pseudospectral method（GPM）has been demonstrated as an effective tool to solve the trajectory optimization problem with typical ***,a series of diffculties arises for complex constraints,such as the uncertainty of passage time for waypoints and the inaccuracy of approximate trajectory near no-fly *** research herein proposes a multi-phase technique based on the GPM to generate an optimal reentry trajectory for HV satisfying waypoint and nofly zone *** kinds of specifc breaks are introduced to divide the full trajectory into multiple *** continuity conditions are presented to ensure a smooth connection between each pair of *** examples for reentry trajectory optimization in free-space flight and with complex constraints are used to demonstrate the proposed *** results show the feasible application of multi-phase technique in reentry trajectory optimization with waypoint and no-fly zone constraints.

关键词： Hypersonic vehicles Reentry trajectory optimization Multi-phase Gauss pseudospectral method(MGPM) Waypoint No-fly zone

A TWO-STAGE ESTIMATION ALGORITHM FOR A TYPE OF CURRENT STATUS DATA

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Journal of Systems Science & Complexity 2012年第3期25卷 556-566页

作者： Hui zhao Ningning jiang School of Mathematics and Statistics Central China Normal University Institute of Systems Science Academy of Mathematics and Systems ScienceChinese Academy of Sciences

Success-failure life tests are widely used in reliability engineering research to evaluate the storage life of products, where the observed data are the current status data, usually summarized as the form of ＂binomial life data＂. For this type of data, this paper proposes a two-stage algorithm to estimate some commonly used lifetime distributions. This Mgorithm is automatic, intuitively appealing and simple to implement. Simulation studies show that compared with some existing methods, the proposed algorithm is more stable and efficient, especially in small sample situations, and it can also be extended to deM with some complicated lifetime distributions.

关键词： Current status data nonparametric maximum likelihood estimation success-failure lifetest.