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Micro gas turbine:Developments,applications,and key technologies on components

Propulsion and Power Research 2023年第1期12卷 1-43页

作者： jingqi li Yulong li National Key Laboratory of Science and Technology on Aero Engines Aero-thermodynamics&Collaborative Innovation Center for Advanced Aero-Engine School of Energy and Power EngineeringBeihang UniversityBeijing 100191China

Owing to their precedent characteristics,micro gas turbines(MGTs)have been favored as popular power machinery in plenty of energy systems such as distributed energy systems,range extenders,solar power generations,fuel cell systems and individual power *** specific features essentially include but are not limited to strong fuel adaptability,low emissions,flexible structure,and easy *** the past 20 years,various types of MGTs have been *** and forward-looking technologies have been employed in the design and production of MGTs and their *** them,fully radial flow structures,gas lubricated bearings and efficient recuperators are typical approaches to enhance the overall performance and compactness,however,the exploitation of ceramic based materials and intelligent algorithms in component design can also assist in improving the *** applications of MGTs have been expanded to many fields,and the research on related components has also made new *** to the time frame,there is no systematic summary of the latest relevant research,so it is essential to have a comprehensive understanding of the applications of MGTs and their pertinent *** paper aims to present a comprehensive review on MGTs,covering the development status,applications,factors of performance and representative explorations of their *** investigations regarding the characteristics of commercial MGTs are also *** in distributed energy,range extenders,solar generations,and fuel cell systems are distinctly *** research work on compressors,turbines,combustors,recuperators,and rotor systems are reviewed and *** technologies and methods associated with materials,manufacturing,and cycles beneficial to the future development of MGTs are also explained and discussed in some detail.

关键词： Distributed generation Micro gas turbines(MGTs) Compressor Turbine Optimization

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Numerical Investigation of Jet Impingement Cooling with Supercritical Pressure Carbon Dioxide in a Multi-Layer Cold Plate during High Heat Flux

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Journal of Thermal Science 2023年第1期32卷 237-253页

作者： WEN Yaming li Yulong li jingqi YU Xin-Gang National Key Laboratory of Science and Technology on Aero Engines Aero-Thermodynamics&Collaborative Innovation Center for Advanced Aero-Engine School of Energy and Power EngineeringBeihang UniversityBeijing 100191China Beijing Institute of Spacecraft System Engineering Beijing 100094China

Jet impingement cooling with supercritical pressure carbon dioxide in a multi-layer cold plate during the heat flux of 400 W/cm_(2) is investigated *** generation and distribution of pseudocritical fluid with the high specific heat of supercritical pressure carbon dioxide and the mechanism of the heat transfer enhancement led by the high specific heat are *** a given nozzle diameter,the effects of the geometric parameters of a multi-layer cold plate such as the relative nozzle-to-plate distance,relative plate thickness,and relative upper fluid thickness on the average heat transfer coefficient are *** results show that the target surface is cooled effectively with supercritical pressure carbon dioxide jet impingement *** the radial distance is less than 6 mm,the maximum wall temperature is 368 K,which is 30 K lower than the maximum junction temperature for a silicon-based insulated gate bipolar transistor,a typical electronic power *** is a pseudocritical fluid layer near the target surface,where specific heat reaches above 34 kJ/(kg·K)*** drastic rise of the specific heat leads to obvious heat transfer *** a certain range,the local heat transfer coefficient and the specific heat are linearly correlated and Stanton number remains constant over this *** heat transfer coefficient is at a maximum when the relative nozzle-to-plate distance is *** the relative plate thickness increases from 0.5 to 3.5 or the relative upper fluid thickness increases from 0.5 to 2.5,the average heat transfer coefficient decreases monotonically.

关键词： high heat flux jet impingement cooling supercritical pressure carbon dioxide heat transfer enhancement

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Effects of brain-derived neurotrophic factor on induced differentiation of SH-SY5Y cells in vitro

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Neural Regeneration Research 2009年第12期4卷 1062-1067页

作者： Jiao li jingqi li Xueli li lixia Lu Lei Xu Department of Biochemistry and Molecular Biology Medical School Tongji University Shanghai 200092 China

BACKGROUND： Previous studies have demonstrated that brain-derived neurotrophic factor （BDNF） promotes neural differentiation. However, the mechanisms involved in cell cycle-related protein regulation, which highly correlates to neural proliferation and apoptosis, remain poorly understood. OBJECTIVE： To investigate the effects of various concentrations of BDNF on cycle-related protein mRNA expression in induce-differentiated SH-SY5Y cells in vitro prior to and following G2 phase, and to analyze the neuroprotective effects of BDNF. DESIGN, TIME AND SETTING： A comparison, observational study, based on cell biology, was performed at the Department of Biochemistry, Medical College of Tongji University, from March 2005 to October 2006. MATERIALS： SH-SY5Y cells were provided by Shanghai Institute of Cytology, Chinese Academy of Science; BDNF by Alomone Labs, Israel; all-trans retinoic acid （ATRA） by Sigma-Aldrich, USA. METHODS： SH-SY5Y cells were randomly divided into three groups： blank control [cells were treated in Insulin-Transferrin-Selenium （ITS） solution for 7 days], ATRA （cells were treated with ITS solution containing 10 μmol/L ATRA for 7 days）, and BDNF （cells were treated identical to the ATRA group for 5 days, and then respectively treated in ITS solution containing 1, 10, and 100 μg/L BDNF for 2 days）. The experiment was repeated three times for each group. MAIN OUTCOME MEASURES： mRNA expression levels of cyclin A1, B1, B2, cyclin-dependent kinase 1, and 5 were detected using quantitative real-time RT-PCR; percentage of cells in G1, S, and G2 phases were detected using fluorescence-activated cell sorting. RESULTS： mRNA expression levels of cyclin A1 in the high-dose BDNF group was significantly less than the ATRA group （P 〈 0.05）.mRNA expression levels of cyclin B1 was significantly less in the different BDNF concentration groups compared with the control and ATRA groups （P 〈 0.05 or P 〈 0.01）. mRNA expression levels of cyclin B2 and cyclin-dependent kinase 1

关键词： brain-derived neurotrophic factor induced differentiation cell cycle-related protein quantitative real-time RT-PCR fluorescence-activated cell sorting SH-SY5Y cell line

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Prognosis in prolonged coma patients with diffuse axonal injury assessed by somatosensory evoked potential

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Neural Regeneration Research 2013年第10期8卷 948-954页

作者： Xiujue Zheng Mantao Chen jingqi li Fei Cao Department of Neurosurgery First Affiliated HospitalSchool of MedicineZhejiang University Hangzhou Hospital of Zhejiang Armed Police Corps

A total of 43 prolonged coma patients with diffuse axonal injury received the somatosensory evoked potential examination one month after injury in the First Affiliated Hospital, School of Medicine, Zhejiang University in China. Somatosensory evoked potentials were graded as normal, abnormal or absent （grades I-III） according to N20 amplitude and central conduction time. The outcome in patients with grade III somatosensory evoked potential was in each case unfavorable. The prognostic accuracy of grade III somatosensory evoked potential for unfavorable and non-awakening outcome was 100% and 80%, respectively. The prognostic accuracy of grade I somatosensory evoked potential for favorable and wakening outcome was 86% and 100%, respectively. These results suggest that somatosensory evoked potential grade is closely correlated with coma severity and degree of recovery. Somatosensory evoked potential is a valuable diagnostic tool to assess prognosis in prolonged coma patients with diffuse axonal injury.

关键词： neural regeneration brain injury somatosensory evoked potential diffuse axonal injury coma prognosis awakening nerve electrophysiology grants-supported paper neuroregeneration

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Construction and Application of Cloud Computing Model for Reciprocal and Collaborative Knowledge Management

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Computers, Materials & Continua 2023年第4期75卷 1119-1137页

作者： jingqi li Yijie Bian Jun Guan Lu Yang Business School Hohai UniversityNanjing211100China Network and Information Technology Center Hohai UniversityNanjing210098China

Promoting the co-constructing and sharing of organizational knowledge and improving organizational performance have always been the core research subject of knowledge *** research focuses on the construction of knowledge management systems and knowledge sharing and transfer *** the rapid development and application of cloud computing and big data technology,knowledge management is faced with many problems,such as how to combine with the new generation of information technology,how to achieve integration with organizational business processes,and so *** solve such problems,this paper proposes a reciprocal collaborative knowledge management model(RCKMmodel)based on cloud computing technology,reciprocity theory,and collaboration *** model includes project group management and cloud computing technology,which can realize management,finance,communication,and quality assurance of multiple projects and solve the problem of business integration with knowledge *** paper designs evaluation methods of tacit knowledge and reciprocity preference based on the Bayesian formula and analyzes their effect with simulation *** methods can provide quantitative support for the integration of knowledge management and business management to realize reciprocity and collaboration in the RCKM *** research found that RCKM model can fully use cloud computing technology to promote the integration of knowledge management and organizational business,and the evaluation method based on the Bayesian formula can provide relatively accurate data support for the evaluation and selection of project team members.

关键词： Cloud computing knowledge management tacit knowledge reciprocal preference

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Plate-based cylinder metamaterial with negative Poisson's ratio and outstanding mechanical performance

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Science China(Technological Sciences) 2023年第3期66卷 793-806页

作者： li Xiang XIAO Ran CHEN JuZheng li jingqi FAN Rong SONG Jian LU Yang School of Sciences Nanjing University of Science and TechnologyNanjing 210094China Nano-Manufacturing Laboratory(NML) Shenzhen Research Institute City University of Hong KongShenzhen 518057China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China College of Civil and Transportation Engineering Shenzhen UniversityShenzhen 518060China CityU-Xidian Joint Laboratory of Micro/Nano-Manufacturing Shenzhen 518057China

Plate-based cellular materials exhibit greater stiffness and strength than conventional cellular materials formed by *** this study,we designed and fabricated a plate-based auxetic cylinder metamaterial using high-resolution projection micro-stereolithography three-dimensional printing *** and modeling results validated the auxetic behavior of the plate-based *** normalized Young’s modulus and yield strength of a four-layer auxetic cylinder are increased by 141%and 32%,respectively,compared with the conventional auxetic *** study presents a universal strategy for fabricating plate-based auxetic metamaterials with appropriate mechanical performance for various structural applications.

关键词： auxetic plate-based cylinder mechanical metamaterial 3D printing

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Comparative Study on Torque Performance of Five-phase Single-Stator and Double-Stator Permanent Magnet Synchronous Motors

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CES Transactions on Electrical Machines and Systems 2022年第1期6卷 46-52页

作者： Jing Zhao You Wang jingqi li Hengzai Hu School of Automation Beijing Institute of TechnologyBeijing100081China United Automotive Electronics Co. LtdShanghaiChina

This paper compares the torque characteristics of single stator permanent magnet synchronous motor(PMSM)and double-stator PMSM under different split-ratios,air-gap lengths and shaft diameters by finite element ***,the effects of split-ratio towards the torque characteristics of the two motor structures under different air-gap lengths are researched,the results show that the optimal split-ratios of the two motor structures do not change under different air-gap lengths,and the optimal split-ratio of the double-stator motor is greater than that of single-stator,and the torque of the double-stator motor is greater than that of single-stator motor with arbitrary split-ratio under the same air-gap length;Finally,the effects of the shaft diameter to the torque of the two motor structures are investigated,obtaining that with the increasing of shaft diameter,the electromagnetic torque of the single-stator motor is almost unchanged,however,the torque of the double-stator is gradually reduced,when the shaft diameter reached a certain extent,the electromagnetic torque of the double-stator motor is smaller than that of single-stator motor with the split ratio within a certain range,and the torque/quality ratio of the double-stator motor is smaller than that of single-stator motor with their optimal split ratio separately.

关键词： Five-phase PMSM double-stator single-stator split ratio electromagnetic torque

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Unique Characteristics of Vertical Carbon Nanotube Field-effect Transistors on Silicon

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Nano-Micro Letters 2014年第3期6卷 287-292页

作者： jingqi li Weisheng Yue Zaibing Guo Yang Yang Xianbin Wang Ahad A.Syed Yafei Zhang Nanofab King Abdullah University of Science and Technology Key Laboratory for Thin Film and Microfabrication Technology of the Ministry of Education School of Electronics Information and Electrical Engineering Shanghai Jiao Tong University

A vertical carbon nanotube field-effect transistor(CNTFET) based on silicon(Si) substrate has been proposed and simulated using a semi-classical theory. A single-walled carbon nanotube(SWNT) and an n-type Si nanowire in series construct the channel of the transistor. The CNTFET presents ambipolar characteristics at positive drain voltage(Vd) and n-type characteristics at negative Vd. The current is significantly influenced by the doping level of n-Si and the SWNT band gap. The n-branch current of the ambipolar characteristics increases with increasing doping level of the n-Si while the p-branch current decreases. The SWNT band gap has the same influence on the p-branch current at a positive Vd and n-type characteristics at negative Vd. The lower the SWNT band gap, the higher the current. However, it has no impact on the n-branch current in the ambipolar characteristics. Thick oxide is found to significantly degrade the current and the subthreshold slope of the CNTFETs.

关键词： Carbon Nanotube Field-effect Transistors Semi-classical Simulation

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Responses of Patients with Disorders of Consciousness to Habit Stimulation:A Quantitative EEG Study

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Neuroscience Bulletin 2018年第4期34卷 691-699页

作者： jingqi li Jiamin Shen Shiqin liu Maelig Chauvel Wenwei Yang Jian Mei ling Lei li Wu Jian Gao Yong Yang Ming Zhou Nao Kang Rehabilitation Hospital Hangzhou 310000China College of life Information Science and Instrument Engineering Hangzhou Dianzi UniversityHangzhou 310018China Paris Descartes University 45 Rue des Saints-Peres75006 ParisFrance Rehabilitation Center Wu Jing HospitalHangzhou 310051China

Whether habit stimulation is effective in DOC patient arousal has not been reported. In this paper, we analyzed the responses of DOC patients to habit stimulation. Nineteen DOC patients with alcohol consumption or smoking habits were recruited and 64-channel EEG signals were acquired both at the resting state and at three stimulation states. Wavelet transformation and nonlinear dynamics were used to extract the features of EEG signals and four brain lobes were selected to investigate the degree of EEG response to habit stimulation. Results showed that the highest degree of EEG response was from the callname stimulation, followed by habit and music stimulations. Significant differences in EEG wavelet energy and response coefficient were found both between habit and music stimulation, and between habit and call-name stimulation. These findings prove that habit stimulation induces relatively more intense EEG responses in DOC patients than music stimulation, suggesting that it may be a relevant additional method for eliciting patient arousal.

关键词： EEG Disorder of consciousness Habitstimulation Wavelet transformation Nonlinear dynamics Differential analysis

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Prompt learning in computer vision: a survey

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Frontiers of Information Technology & Electronic Engineering 2024年第1期25卷 42-63页

作者： Yiming LEI jingqi li Zilong li Yuan CAO Hongming SHAN Shanghai Key Laboratory of Intelligent Information Processing School of Computer ScienceFudan UniversityShanghai 200438China Institute of Science and Technology for Brain-Inspired Intelligence Fudan UniversityShanghai 200433China MOE Frontiers Center for Brain Science Fudan UniversityShanghai 200433China Shanghai Center for Brain Science and Brain-Inspired Technology Shanghai 201210China

Prompt learning has attracted broad attention in computer vision since the large pre-trained visionlanguagemodels (VLMs) exploded. Based on the close relationship between vision and language information builtby VLM, prompt learning becomes a crucial technique in many important applications such as artificial intelligencegenerated content (AIGC). In this survey, we provide a progressive and comprehensive review of visual promptlearning as related to AIGC. We begin by introducing VLM, the foundation of visual prompt learning. Then, wereview the vision prompt learning methods and prompt-guided generative models, and discuss how to improve theefficiency of adapting AIGC models to specific downstream tasks. Finally, we provide some promising researchdirections concerning prompt learning.

关键词： Prompt learning Visual prompt tuning(VPT) Image generation Image classification Artificial intelligence generated content(AIGC)

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