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From solar terms to medical terms(part Ⅰ): A first step with big data

science China Earth sciences 2017年第9期60卷 1707-1718页

作者： CHEN ge sHI Jie College of Information science and Engineering Ocean University of China Laboratory for Regional Oceanography and Numerical Modeling Qingdao National Laboratory for Marine Science and Technology Department of pharmacy Municipal Hospital of Qingdao

The story of the Twenty-four solar Terms(24-sT_s) is one of the most popular elements in Chinese culture, which has a profound influence on agriculture production, health care, and even daily life in both ancient and modern China. This traditional calendric system was invented by the Chinese ancestors through combining fundamental astronomical knowledge with climatic and phenological conditions in the Yellow River Basin some 2000 years ago. Although the basic philosophy of the 24-sT_s remains valid for the country as a whole to date, their regional robustness has been increasingly challenged by accumulating observational data in terms of temporal shift and spatial inhomogeneity. To tackle these issues, we propose to recalibrate the medically related critical timings of Great Heat and Great Cold in the classic sT system by using big meteorological data, and adjust them by introducing geographically correlated analytical models. As a result, a novel calendric system, called the Twenty-four Medical Terms(24-MT_s), has been developed as an upgraded version of the traditional 24-sT_s. The proposed 24-MT_s are characterized by two striking features with respect to the 24-sT_s: A varying duration of each MT instead of a fixed one for the sT, and a geographically dependent timing for each MT instead of a unified one for the entire nation. As such, the updated 24-MT_s are expected to provide a more realistic estimate of these critical timings around the year, and hence, a more precise guidance to agronomic planning and health care activity in China.

关键词： solar Terms Medical Terms Big Data

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Effect of particle size on the thermal performance of NaNO3/siC)2/C composite phase-change materials

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particuology 2019年第3期17卷 169-175页

作者： Liang Liu Liqiong Wang Weichun ge Yanfeng ge Yun Huang state Key Laboratory of Explosion science and Technology Beijing Institute of Technology Beijing 100081 China state Key Laboratory of Multiphase Complex systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China state Grid Liaoning Electric power supply Co. Ltd. Shenyang 110004 China

storage of thermal energy is a key technology for energy conservation and application of renewable energy sources. In this paper, the thermal performance of inorganic composite phase-change materials (pCMs;NaNO3/siO2/C) is studied under extreme thermal conditions and the effect of raw particle size is examined. We designed a thermal shock test platform with a diffusive combustion system and in-situ infrared thermal imaging. The influences of the heat flux magnitude and exposure time on the performance of the pCMs were examined under vertical thermal shock conditions. Leakage of molten salt in the composite pCMs was observed as the heat flux reached a threshold point. The morphology and thermal properties were characterized by ex-situ sEM, XRD, DsC, and BET. Raw particles with sizes in the range of 105-500 μm were used to synthesize the composite material and examine its role in thermal shock behavior. Our experiments showed that deterioration of the thermal storage density was slowed as the particle size was increased. This work provides useful guidance for improving the anti-thermal shock ability of future material designs.

关键词： Thermal storage phase change material particle size Thermal shock Decomposition temperature

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BIOLUMINEsCENCE TOMOGRApHY:BIOMEDICAL BACKGROUND,MATHEMATICAL THEORY,AND NUMERICAL AppROXIMATION

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Journal of Computational Mathematics 2008年第3期26卷 324-335页

作者： Weimin Han ge Wang Department of Mathematics University of Iowa Iowa City IA 52242 USA Division of Biomedical Imaging Virginia Tech-Wake Forest University School of Biomedical Engineering and Sciences Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 USA

Over the last couple of years molecular imaging has been rapidly developed to study physiological and pathological processes in vivo at the cellular and molecular levels. Among molecular imaging modalities, optical imaging stands out for its unique advantages, especially performance and cost-effectiveness. Bioluminescence tomography （BLT） is an emerging optical imaging mode with promising biomedical advantages. In this survey paper, we explain the biomedical significance of BLT, summarize theoretical results on the analysis and numerical solution of a diffusion based BLT model, and comment on a few extensions for the study of BLT.

关键词： Biomedical imaging Bioluminescence tomography (BLT) Inverse problem,Regularization Numerical approximation Error analysis

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Convergence Rate of the Asymmetric Deffuant-Weisbuch Dynamics

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Journal of systems science & Complexity 2015年第4期28卷 773-787页

作者： ZHANG Jiangbo CHEN ge The Faculty of science Southwest Petroleum University Institute of systems science Academy of Mathematics and Systems Science Chinese Academy of Sciences

This paper considers the convergence rate of an asymmetric Deffuant-Weisbuch *** model is composed by finite n interacting *** this model,agent i’s opinion is updated at each time,by first selecting one randomly from n agents,and then combining the selected agent j’s opinion if the distance between j’s opinion and i’s opinion is not larger than the confidence radiusε*** yields the endogenously changing inter-agent *** on the previous result that all agents opinions will converge almost surely for any initial states,the authors prove that the expected potential function of the convergence rate is upper bounded by a negative exponential function of time t when opinions reach consensus finally and is upper bounded by a negative power function of time t when opinions converge to several different limits.

关键词： Convergence rute Deffuant-Weisbuch model multi-agent systems opinion dynamics.

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statistical properties of pseudo-particle systems

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particuology 2010年第4期8卷 332-342页

作者： Feiguo Chen Wei ge state Key Laboratory of Multi-phase Complex system Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China

pseudo-particle modeling （ppM）, a molecular modeling method which combines time-driven algorithms and hard molecule modeling, was originally developed for simulating gas in complex multiphase systems （ge ＆ Li, 2003; ge et al., 2005; ge, 1998）. In this work, the properties of two- and three-dimensional pseudo-particle systems, namely, mean free path, compressibility factor, self-diffusion coefficient and shear viscosity, are systematically measured by using ppM. it is found that in terms of an effective diameter, the results well conform to the Chapman-Enskog theory, thus suggesting that ppM can be employed to simulate the micro- and meso-scale behavior of ordinary gas and fluid flows.

关键词： pseudo-particle modeling Molecular dynamics Transport coefficient Chapman-Enskog theory

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polymeric piezoelectric accelerometers with high sensitivity,broad bandwidth,and low noise density for organic electronics and wearable microsystems

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Microsystems & Nanoengineering 2024年第3期10卷 63-74页

作者： Chang ge Edmond Cretu The Department of Electrical and Computer Engineering The University of British ColumbiaVancouverBCCanada

piezoelectric accelerometers excel in vibration *** the emerging trend of fully organic electronic microsystems,polymeric piezoelectric accelerometers can be used as vital front-end components to capture dynamic signals,such as vocal vibrations in wearable speaking assistants for those with speaking ***,high-performance polymeric piezoelectric accelerometers suitable for such applications are *** organic compounds such as pVDF have inferior properties to their inorganic counterparts such as ***,most existing polymeric piezoelectric accelerometers have very unbalanced performance *** often sacrifice resonance frequency and bandwidth for a flat-band sensitivity comparable to those of pZT-based accelerometers,leading to increased noise density and limited application *** this study,a new polymeric piezoelectric accelerometer design to overcome the material limitations of pVDF is *** new design aims to simultaneously achieve high sensitivity,broad bandwidth,and low *** samples were manufactured and characterized,demonstrating an average sensitivity of 29.45 pC/g within a±10 g input range,a 5%flat band of 160 Hz,and an in-band noise density of 1.4μg/√*** results surpass those of many pZT-based piezoelectric accelerometers,showing the feasibility of achieving comprehensively high performance in polymeric piezoelectric accelerometers to increase their potential in novel applications such as organic microsystems.

关键词： piezoelectric polymeric overcome

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A polymeric piezoelectric MEMs accelerometer with high sensitivity,low noise density,and an innovative manufacturing approach

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Microsystems & Nanoengineering 2023年第6期9卷 149-164页

作者： Chang ge Edmond Cretu The Department of Electrical and Computer Engineering The University of British ColumbiaVancouverCanada

The piezoelectric coupling principle is widely used(along with capacitive coupling and piezoresistive coupling)for MEMs *** MEMs accelerometers are used primarily for vibration *** piezoelectric MEMs accelerometers offer the merits of heavy-metal-free structure material and simple microfabrication *** importantly,polymeric piezoelectric MEMs accelerometers may be the basis of novel applications,such as fully organic inertial sensing microsystems using polymer sensors and organic integrated *** paper presents a novel polymer piezoelectric MEMs accelerometer design using pVDF films.A simple and rapid microfabrication flow based on laser micromachining of thin films and 3D stereolithography was developed to fabricate three samples of this *** proof-of-concept experiments,the design achieved a sensitivity of 21.82 pC/g(equivalent open-circuit voltage sensitivity:126.32 mV/g),a 5%flat band of 58.5 Hz,and a noise density of 6.02µg/√***,this design rivals state-of-the-art pZT-based counterparts in charge sensitivity and noise density,and it surpasses the performance capabilities of several commercial MEMs ***,this design has a 10-times smaller device area and a 4-times larger flat band than previous state-of-the-art organic piezoelectric MEMs *** experimentally validated performance metrics demonstrate the promising application potential of the polymeric piezoelectric MEMs accelerometer design presented in this article.

关键词： piezoelectric accelerometer noise

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Investigating the Head Impact Force-Induced Evolution of Hyperphosphorylated Tau proteins in Brain Tissue Through Mechanical Mesoscale Finite Element simulation

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Acta Mechanica solida sinica 2022年第4期35卷 705-715页

作者： ge He Lei Fan shanghai Key Laboratory of Mechanics in Energy Enginering Shanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China Department of Mechanical Engineering Michigan State UniversityEast LansingMI 48824USA

For human heads that experienced repetitive subconcussive impacts,abnormal accumulation of hyperphosphorylated tau(p-tau)proteins was found in the postmortem brain *** numerically understand the cause–effect relationship between the external force and the microscopic volume change of the p-tau protein,we created a mesoscale finite element model of the multilayer brain tissue containing microscopic voids representing the p-tau *** model was applied under the loading boundary conditions obtained from a larger length scale simulation.A formerly developed internal state variable elastoplasticity model was implemented to describe the constitutive behaviors of gray and white matters,while the cerebrospinal fluid was assumed to be purely *** effects of the initial sizes and distances of p-tau proteins located at four different brain regions(frontal,parietal,temporal and occipital lobes)on their volumetric evolutions were *** is concluded that both the initial sizes and distances of the proteins have more or less(depending on the specific brain region)influential effects on the growth or contraction rate of the p-tau *** p-tau proteins located within the brain tissue at the frontal and occipital lobes are more heavily affected by the frontal impact load compared with those at the parietal and temporal *** summary,the modeling approach presented in this paper provides a strategy for mechanically studying the evolution of p-tau proteins in the brain tissue and gives insight into understanding the correlation between macroscopic force and microstructure change of the brain tissue.

关键词： Traumatic head injury Hyperphosphorylated tau(p-tau)protein Internal state variable Brain tissue

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Flocking with general Local Interaction and Large population

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Journal of systems science & Complexity 2019年第6期32卷 1498-1525页

作者： CHEN ge LIU Zhixin Key Laboratory of systems and Control & National Center for Mathematics and Interdisciplinary sciences Academy of Mathematics and Systems Science Chinese Academy of Sciences

This paper studies a flocking model in which the interaction between agents is described by a general local nonlinear function depending on the distance between agents. The existing analysis provided sufficient conditions for flocking under an assumption imposed on the system’s closed-loop states; however this assumption is hard to verify. To avoid this kind of assumption the authors introduce some new methods including large deviations theory and estimation of spectral radius of random geometric graphs. For uniformly and independently distributed initial states, the authors establish sufficient conditions and necessary conditions for flocking with large population. The results reveal that under some conditions, the critical interaction radius for flocking is almost the same as the critical radius for connectivity of the initial neighbor graph.

关键词： Consensus Cucker-smale model flocking model multi-agent systems random geometric graph

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Optimal reorientation of underactuated spacecraft using genetic algorithm with wavelet approximation

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Acta Mechanica sinica 2009年第4期25卷 547-553页

作者： Xinsheng ge Liqun Chen College of Mechanical & Electrical Engineering Beijing Information Science & Technology University 100192 Beijing China Department of Mechanical shanghai University 200072 Shanghai China

The optimal attitude control of an underactuated spacecraft is investigated in this paper. The flywheels of the spacecraft can somehow only provide control inputs in two independent directions. The dynamic equations are formulated for the spacecraft under a nonholonomic constraint resulting from the constant time-rate of the total angular momentum of the system. The reorientation of such underactuated spacecraft is transformed into an optimal control problem. A genetic algorithm is proposed to derive the control laws of the two flywheels angle velocity inputs. The control laws are approximated by the discrete orthogonal wavelets. The numerical simulations indicate that the genetic algorithm with the wavelet approximation is an effective approach to deal with the optimal reorientation of underactuated spacecraft.

关键词： Underactuated spacecraft Reorientation Attitude control genetic algorithm Wavelet

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