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中国针灸 1995年第S2期15卷 313-314页

作者： chan xu geng(ShangLi Hospital ShanDong Dongying)

ＡｎａｌｙｓｅｓｏｆＲｅｓｕｌｔｓｉｎ７６ＣａｓｅｓＳｕｆｆｅｒｉｎｇｆｒｏｍＣｈｒｏｎｉｃＰｅｌｖｉｃｉｎｆｌａｍｍａｔｏｒｙＤｉｓｅａｓｅＷｉｔｈＩｎｊｅｃｔｉｎｇｉｎＳｈｅｎｑｕｅ，ＳａｎｙｉｎｊｉａｏＰｏｉｎ... 详细信息

ＡｎａｌｙｓｅｓｏｆＲｅｓｕｌｔｓｉｎ７６ＣａｓｅｓＳｕｆｆｅｒｉｎｇｆｒｏｍＣｈｒｏｎｉｃＰｅｌｖｉｃｉｎｆｌａｍｍａｔｏｒｙＤｉｓｅａｓｅＷｉｔｈＩｎｊｅｃｔｉｎｇｉｎＳｈｅｎｑｕｅ，ＳａｎｙｉｎｊｉａｏＰｏｉｎｔｓ￥ＣｈａｎＸｕＧｅｎｇ（Ｓｈａ...

关键词： Poin Analyses Cases

A Flexible Smart Healthcare Platform Conjugated with Artificial Epidermis Assembled by Three‑Dimensionally Conductive MOF Network for Gas and Pressure Sensing

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Nano-Micro Letters 2025年第2期17卷 601-620页

作者： Qingqing Zhou Qihang Ding Zixun geng Chencheng Hu Long Yang Zitong Kan Biao Dong Miae Won Hongwei Song Lin xu Jong Seung Kim State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012People’s Republic of China Department of Chemistry Korea UniversitySeoul 02841Republic of Korea TheranoChem Incorporation Seoul 02856Republic of Korea

The rising flexible and intelligent electronics greatly facilitate the noninvasive and timely tracking of physiological information in telemedicine *** building bionic-sensitive moieties is vital for designing efficient electronic skin with advanced cognitive functionalities to pluralistically capture external ***,realistic mimesis,both in the skin’s three-dimensional interlocked hierarchical structures and synchronous encoding multistimuli information capacities,remains a challenging yet vital need for simplifying the design of flexible logic ***,we construct an artificial epidermal device by in situ growing Cu_(3)(HHTP)_(2) particles onto the hollow spherical Ti_(3)C_(2)T_(x) surface,aiming to concurrently emulate the spinous and granular layers of the skin’s *** bionic Ti_(3)C_(2)T_(x)@Cu_(3)(HHTP)_(2) exhibits independent NO_(2) and pressure response,as well as novel functionalities such as acoustic signature perception and Morse code-encrypted message ***,a wearable alarming system with a mobile application terminal is self-developed by integrating the bimodular senor into flexible printed *** system can assess risk factors related with asthmatic,such as stimulation of external NO_(2) gas,abnormal expiratory behavior and exertion degrees of fingers,achieving a recognition accuracy of 97.6%as assisted by a machine learning *** work provides a feasible routine to develop intelligent multifunctional healthcare equipment for burgeoning transformative telemedicine diagnosis.

关键词： Ti_(3)C_(2)T_(x)@Cu_(3)(HHTP)_(2)composites NO_(2)/pressure flexible sensors Health-monitoring Machine learning

Numerical simulation of shock wave phenomena in hydrodynamic model of semiconductor devices

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The Journal of China Universities of Posts and Telecommunications 2007年第1期14卷 71-76页

作者： xu Ning YANG geng College of Optical and Electric Engineering Nanjjing University of Posts and Telecommunications Nanjing 210003 China College of Mathematics and Physics Nanking University of Posts and Telecommunications Nanjing 210003 China

We propose a finite element method to investigate the phenomena of shock wave and to simulate the hydrodynamic model in semiconductor devices. An introduction of this model is discussed first. Then some scaling factors and a relationship between the changing variables are discussed. And then, we use a finite element method （P1-iso-P2 element） to discrete the equations. Some boundary conditions are also discussed. Finally, a sub-micron n%＋-n-n^＋ silicon diode and Si MESFET device are simulated and the results are analyzed. Numerical results show that electronic fluids are transonic under some conditions.

关键词： hydrodynamic model semiconductor devices finite element method shock wave

Stability of Entropy Solution of Conservation Law Systems on Flow Function and Relaxation Function

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Acta Mathematicae Applicatae Sinica 2021年第4期37卷 747-757页

作者： Jin-bo geng xu-dong WANG College of Mathematics and Computer Science Zhejiang Normal UniversityJinhua321004China School of Mathematical Sciences Fudan UniversityShanghai200433China

In this paper,using the fractional step Lax-Friedrichs difference scheme,we establish the stability of the entropy solution on flow function and relaxation function for a class of conservation law systems with a sourc... 详细信息

关键词： stability Lax-Friedrichs difference scheme conservation law entropy solution

Aero-engine fault diagnosis applying new fast support vector algorithm

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航空动力学报 2012年第7期27卷 1604-1612页

作者： xu Qi-hua geng Shuai SHI Jun College of Electronic Engineering Huaihai Institute of Technology Lianyungang Jiangsu 222005 China No. 365 Institute Northwestern Polytechnical University Xi'an 710072 China

A new fast learning algorithm was presented to solve the large-scale support vector machine ( SVM ) training problem of aero-engine fault *** relative boundary vectors ( RBVs ) instead of all the original training samples were used for the training of the binary SVM fault *** pruning strategy decreased the number of final training sample significantly and can keep classification accuracy almost *** , the training time was shortened to 1 / 20compared with basic SVM *** , owing to the reduction of support vector number , the classification time was also *** sample aliasing existed , the aliasing sample points which were not of the same class were eliminated before the relative boundary vectors were *** , the samples near the relative boundary vectors were selected for SVM training in order to prevent the loss of some key sample points resulted from *** can improve classification accuracy effectively.A simulation example to classify 5classes of combination fault of aero-engine gas path components was finished and the total fault classification accuracy reached 96.1%.Simulation results show that this fast learning algorithm is effective , reliable and easy to be implemented for engineering application.

关键词： aero-engine support vector machines fault diagnosis large-scale training set relative boundary vector sample pruning

Stability and bifurcation analysis for a delayed viral infection model with full logistic proliferation

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International Journal of Biomathematics 2020年第5期13卷 33-62页

作者： Yan geng Jinhu xu School of Science Xi'an Polytechnic University Xi'an 710048ShanxiP.R.China School of Sciences Xi'an University of Technology Xi'an 710049ShanxiP.R.China

In this paper,we study a delayed viral infection model with cellular infection and full logistic proliferations for both healthy and infected *** global asymptotic stabil-ities of the equilibria are studied by constructing Lyapunov ***,we investigated the existence of Hopf bifurcation at the infected equilibrium by regarding the possible combination of the two delays as bifurcation *** results show that time delays may destabilize the infected equilibrium and lead to Hopf ***,numerical simulations are carried out to illustrate the main results and explore the dynamics including Hopf bifurcation and stability switches.

关键词： Time delay Full logistic proliferation Global stability Hopf bifurcation Stability switches

Enhancing short-term ethanol-type fermentation of waste activated sludge by adding saccharomycetes and the implications for bioenergy and resource recovery

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Journal of Environmental Sciences 2022年第3期34卷 179-189页

作者： Linke Zheng Ying xu Hui geng Xiaohu Dai State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and EngineeringTongji UniversityShanghai 200092China East China Architecture Design&Research Institute Shanghai 200002China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Ethanol-type sludge fermentation has recently attracted much attention because it can enhance direct interspecies electron transfer and thus improve the anaerobic digestion of waste activated sludge(WAS). In this paper, the enhancement of short-term ethanol-type fermentation of WAS via adding Saccharomyces was investigated. The experimental results show that the maximum ethanol production of 1030.8 ± 20.6 mg/L was achieved, with the optimum fermentation conditions of a p H of 5.1, temperature of 26.0 ℃ and time of 8.0 hr. Although the content of volatile fatty acid(VFA) increased within 10 hr, it is one order of magnitude lower than the content of ethanol, indicating that the VFA generation did not affect the efficient production of ethanol. The analyses of changes in the microbial community during the fermentation process demonstrate that the greatest Saccharomyces activity occurred in the first 8 hr and it can play an important role in ethanol production even at a very low relative abundance. Meanwhile, most typical acid-producing bacteria were inhibited, but the hydrogenotrophic methanogens(i.e., Methanobacterium) were enriched to a certain extent. Further statistical analyses reveal that the Rhodobacter, Thermomonas, Terrimonas and Saccharomyces are responsible for ethanol production during the fermentation. However, these findings not only provide a reference for the development of enhancing ethanol-type fermentation of sludge, but also are expected to provide a new way of thinking for the efficient bioenergy and resource recovery from sludge.

关键词： Anaerobic digestion Sewage sludge Methane production Ethanol production Biodegradability

Breakthrough detection in electrochemical discharge drilling to enhance machining stability

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Chinese Journal of Aeronautics 2023年第6期36卷 460-475页

作者： Tianyu geng Zhengyang xu Chenxiang ZHANG Jin NING College of Mechanical&Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Film cooling holes are widely used in aero-engine turbine *** blades feature large numbers of holes with complex angles and require a high level of surface *** discharge drilling(ECDD)combines the high efficiency of electrical discharge drilling(EDD)with high quality of electrochemical drilling(ECD).However,due to the existence of a variety of energy for material removal,accurate and timely detection of breakthroughs is fraught with *** insufficient preset setting distance results in a tiny exit aperture,influencing the structure's *** addition,the electrode is prone to bending at a large overfeeding distance,causing secondary discharge damaging sidewall surface *** paper compares and analyzes the characteristics of processing waveforms using EDD and ECDD.A novel breakthrough detection method is proposed based on the variance signal of average voltage(VSAV)to increase machining stability and achieve fabrication without a recast *** method extracts the fluctuation transformation by calculating the variance of the *** signal detection,the overfeeding distance is *** experiment is used to validate the breakthrough detection with 100%accuracy in all *** optimum overfeeding distances for hole angles of 0°,30°,and 60° are obtained,and the stable removal of the recast layer is ***,the effectiveness of the method is verified on a typical workpiece with a double-wall structure and a nickel-based single crystal blade.

关键词： change detection Electrochemical discharge drilling(ECDD) Electric discharge Film cooling holes Recast layer Variance signal of average voltage(VSAV)

Charge Density-Based Pyroelectric Vacuum Sensor

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Research 2023年第2期6卷 379-388页

作者： Lan xu geng Huangfu Yiping Guo Ya Yang CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of ScienceBeijing 101400P.R.China State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240P.R.China School of Nanoscience and Technology University of Chinese Academy of SciencesBejing100049P.R.China School of Chemistry and Chemical Engineering Center on Nanoenergy ResearchGuangxi UniversityNanningGuangxi530004P.R.China

A traditional thermal conductivity vacuum gauge mainly detects low pressure(the degree of vacuum)by measuring the temperature change of a filament heated by the electric *** propose a novel pyroelectric vacuum sensor that utilizes the effect of ambient thermal conductivity on the pyroelectric effect to detect vacuum through the charge density of ferroelectric materials under radiation.

关键词： vacuum conductivity utilize

KAM tori for higher dimensional beam equation with a fixed constant potential

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Science China Mathematics 2009年第9期52卷 2007-2018页

作者： xu XinDong geng JianSheng Department of Mathematics Institute of Mathematical ScienceNanjing UniversityNanjing 210093China

In this paper, we consider the higher dimensional nonlinear beam equation:utt+△2u+σu + f(u)=0 with periodic boundary conditions, where the nonlinearity f(u) is a real-analytic function of the form f(u)=u3+ h.o.t near u=0 and σ is a positive constant. It is proved that for any fixed σ>0, the above equation admits a family of small-amplitude, linearly stable quasi-periodic solutions corresponding to finite dimensional invariant tori of an associated infinite dimensional dynamical system.

关键词： beam equation KAM tori Birkhoff normal form 37K60 37K55