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ON INTEGRABILITY UP TO THE BOUNDARY OF THE WEAK SOLUTIONS TO A NON-NEWTONIAN FLUID

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Acta Mathematica Scientia 2019年第2期39卷 420-428页

作者： Shanshan guo zhong TAN School of Mathematical Sciences Xiamen University School of Mathematical Sciences and Fujian Provincial Key Laboratory on Mathematical Modeling and Scientific Computing Xiamen University

This work consider boundary integrability of the weak solutions of a non-Newtonian compressible fluids in a bounded domain in dimension three, which has the constitutive equartions as ■The existence result of weak solutions can be get based on Galerkin approximation. With the linear operator B constructed by BOGOVSKII, we show that the density ■is square integrable up to the boundary.

关键词： compressible fluid weak solutions non-Newtonian fluids integrability

Development of an ε-type actuator for enhancing high-speed electro-pneumatic ejector valve performance

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第11期9卷 1552-1559页

作者： zhong XIANG Hao LIU guo-Liang TAO Jun MAN Wei zhong State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China

A novel ε-type solenoid actuator is proposed to improve the dynamic response of electro-pneumatic ejector valves by reducing moving mass weight. A finite element analysis (FEA) model has been developed to describe the static and dynamic operations of the valves. Compared with a conventional E-type actuator, the proposed ε-type actuator reduced the moving mass weight by almost 65% without significant loss of solenoid force, and reduced the response time (RT) typically by 20%. Prototype valves were designed and fabricated based on the proposed ε-type actuator model. An experimental setup was also established to investigate the dynamic characteristics of valves. The experimental results of the dynamics of valves agreed well with simulations, indicating the validity of the FEA model.

关键词： ε-type actuator High-speed electro-pneumatic ejector valve Finite element method Dynamic simulation and experiment

A novel method for gamma spectrum analysis of low-level and intermediate-level radioactive waste

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Nuclear Science and Techniques 2023年第6期34卷 199-213页

作者： Hui Yang Xin-Yu Zhang Wei-guo Gu Bing Dong Xue-Zhi Jiang Wen-Tao zhou De-zhong Wang School of Nuclear Science and Engineering Shanghai Jiao Tong UniversityShanghai200240China

The uncertainty of nuclide libraries in the analysis of the gamma spectra of low-and intermediate-level radioactive waste(LILW)using existing methods produces unstable *** address this problem,a novel spectral analysis method is proposed in this *** this method,overlapping peaks are located using a continuous wavelet *** improved quadratic convolution method is proposed to calculate the widths of the peaks and establish a fourth-order filter model to estimate the Compton edge baseline with the overlapping *** with the adaptive sensitive nonlinear iterative peak,this method can effectively subtracts the ***,a function describing the peak shape as a filter is used to deconvolve the energy spectrum to achieve accurate qualitative and quantitative analyses of the nuclide without the aid of a nuclide *** spectrum acquisition experiments for standard point sources of Cs-137 and Eu-152,a segmented gamma scanning experiment for a 200 L standard drum,and a Monte Carlo simulation experiment for triple overlapping peaks using the closest energy of three typical LILW nuclides(Sb-125,Sb-124,and Cs-134)are *** results of the experiments indicate that(1)the novel method and gamma vision(GV)with an accurate nuclide library have the same spectral analysis capability,and the peak area calculation error is less than 4%;(2)compared with the GV,the analysis results of the novel method are more stable;(3)the novel method can be applied to the activity measurement of LILW,and the error of the activity reconstruction at the equivalent radius is 2.4%;and(4)The proposed novel method can quantitatively analyze all nuclides in LILW without a nuclide *** novel method can improve the accuracy and precision of LILW measurements,provide key technical support for the reasonable disposal of LILW,and ensure the safety of humans and the environment.

关键词： HPGe detector Low-level and intermediate-level radioactive waste Gamma spectrum analysis method Deconvolution method Continuous wavelet transform

Scientometric analysis of research trends on solid oxide electrolysis cells for green hydrogen and syngas production

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Frontiers in Energy 2024年第5期18卷 583-611页

作者： Shimeng Kang Zehua Pan Jinjie guo Yexin zhou Jingyi Wang Liangdong Fan Chunhua Zheng Suk Won Cha Zheng zhong School of Science Harbin Institute of TechnologyShenzhen 518055China Department of New Energy Science and Technology College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen 518060China Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen 518055China Department of Mechanical Engineering Seoul National UniversitySeoul 08826Republic of Korea

Solid oxide electrolysis cell(SOEC)is a promising water electrolysis technology that produces hydrogen or syngas through water electrolysis or water and carbon dioxide *** hydrogen or syngas can be produced by SOEC with renewable ***,SOEC has attracted continuous attention in recent years for the urgency of developing environmentally friendly energy sources and achieving carbon *** on 1276 related articles retrieved from the Web of Science(WoS)database,the historical development of SOECs are depicted from 1983 to 2023 in this *** co-occurrence networks of the countries,source journals,and author keywords are ***,three main clusters showing different content of the SOEC research are identified and ***,the scientometric analysis and the content of the high-cited articles of the research of different topics of SOECs:fuel electrode,air electrode,electrolyte,co-electrolysis,proton-conducting SOECs,and the modeling of SOECs are also *** results show that co-electrolysis and proton-conducting SOECs are two popular directions in the study of *** paper provides a straightforward reference for researchers interested in the field of SOEC research,helping them navigate the landscape of this area of study,locate potential partners,secure funding,discover influential scholars,identify leading countries,and access key research publications.

关键词： solid oxide electrolysis cell(SOEC) scientometric review knowledge network material development H_(2)O-CO_(2)co-electrolysis modeling

A new three-term spectral conjugate gradient algorithm with higher numerical performance for solving large scale optimization problems based on Quasi-Newton equation

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International Journal of Modeling, Simulation, and Scientific Computing 2021年第5期12卷 234-247页

作者： Jie guo zhong Wan School of Mathematics and Statistics Central South University Hunan ChangshaP.R.China

A new spectral three-term conjugate gradient algorithm in virtue of the Quasi-Newton equation is developed for solving large-scale unconstrained optimization *** is proved that the search directions in this algorithm always satisfy a sufficiently descent condition independent of any line *** convergence is established for general objective functions if the strong Wolfe line search is *** experiments are employed to show its high numerical performance in solving large-scale optimization ***,the developed algorithm is implemented to solve the 100 benchmark test problems from CUTE with different sizes from 1000 to 10,000,in comparison with some similar ones in the *** numerical results demonstrate that our algorithm outperforms the state-of-the-art ones in terms of less CPU time,less number of iteration or less number of function evaluation.

关键词： High performance computing optimization algorithm conjugate gradient method convergence analysis

Dependence of Soil Respiration on Soil Temperature and Soil Moisture in Successional Forests in Southern China

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Journal of Integrative Plant Biology 2006年第6期48卷 654-663页

作者： Xu-Li Tang guo-Yi zhou Shu-Guang Liu De-Qiang Zhang Shi-zhong Liu Jiong Li Cun-Yu zhou South China Botanical Garden the Chinese Academy of Sciences Guangzhou 510650 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China Science Applications International Corporation （ SAIC） US Geological Survey （ USGS） National Center for Earth Resources Observation and Science （EROS） Sioux Falls South Dakota 57198 USA

The spatial and temporal variations in soil respiration and its relationship with biophysical factors In forests near the Tropic of Cancer remain highly uncertain. To contribute towards an Improvement of actual estimates, soil respiration rates, soil temperature, and soil moisture were measured In three successional subtropical forests at the Dlnghuahan Nature Reserve （DNR） In southern China from March 2003 to February 2005. The overall objective of the present study was to analyze the temporal variations of soil respiration and Its biophysical dependence in these forests. The relationships between biophysical factors and soil respiration rates were compared In successional forests to test the hypothesis that these forests responded similarly to biophysical factors. The seasonality of soil respiration coincided with the seasonal climate pattern, with high respiration rates in the hot humid season （April-September） and with low rates In the cool dry season （October-March）. Soil respiration measured at these forests showed a clear Increasing trend with the progressive succession. Annual mean （± SD） soil respiration rate In the DNR forests was （9.0 ± 4.6） Mg CO2-C/hm^2 per year, ranging from （6.1 ± 3.2） Mg CO2-C/hm^2 per year in early successional forests to （10.7 ± 4.9） Mg CO2-C/hm^2 per year in advanced successional forests. Soil respiration was correlated with both soil temperature and moisture. The T/M model, where the two biophysical variables are driving factors, accounted for 74%-82% of soil respiration variation In DNR forests. Temperature sensitivity decreased along progressive succession stages, suggesting that advanced-successional forests have a good ability to adjust to temperature. In contrast, moisture Increased with progressive succession processes. This increase is caused, in part, by abundant respirators In advanced-successional forest, where more soil moisture is needed to maintain their activities.

关键词： Dinghushan Nature Reserve moisture sensitivity Q10 soil CO2 efflux soil respiration subtropical forests successional forests temperature sensitivity Tropic of Cancer.

Effect of inorganic salt on the thermal degradation of nitrocellulose and reaction mechanism of its mixture

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Defence Technology（防务技术） 2023年第9期27卷 111-118页

作者： guo-zhong Xu Xu Gao Mi Li zhong-xuan Han Lin Jiang School of Mechanical Engineering Nanjing University of Science and TechnologyChina

In this study,to better understand the reaction mechanism between inorganic salts and nitrocellulose,CaCO_(3) and Li_(2)CO_(3) were evaluated with respect to their effects on the thermal degradation of NC in nitrogen atmosphere using TG/DSC at three different heating rates(2,5,10 K/min).The numerical relationship between activation energy(E)and conversion rate was obtained by FWO and KAS method,and it was discovered that CaCO_(3) could improve the thermal stability of *** energy values were calculated by Kissinger method,and it was found that NC that contain Li2CO3had the highest activation energy while NC containing CaCO3had the lowest E *** combining the thermal analysis data with Malek method,the most probable mechanism model of thermal degradation is obtained as Sesták-Berggren model,which expression is f(α)=α^(m)(1-α)^(n).As a result of this study,there are certain guiding principles that can be applied to the pyrolysis reaction model and to the actual production process of nitrocellulose.

关键词： Thermal analysis Thermal decomposition mechanism Malek method Nitrocellulose Inorganic salt

Energy-aware Integrated Scheduling for Container Terminals with Conflict-free AGVs

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Journal of Systems Science and Systems Engineering 2023年第4期32卷 413-443页

作者： Zhaolin zhong Yiyun guo Jihui Zhang Shengxiang Yang Institute of Complexity Science School of AutomationQingdao UniversityQingdao266071China Shandong Key Laboratory of Industrial Control Technology Qingdao266071China Qingdao Port International Company Ltd.Qingdao266011China Institute of Artificial Intelligence School of Computer Science and InformaticsDe Montfort UniversityLeicesterLE19BHUK

For automated container terminals,the effective integrated scheduling of different kinds of equipment such as quay cranes(QCs),automated guided vehicles(AGVs),and yard cranes(YCs)is of great significance in reducing energy consumption and achieving sustainable *** at the joint scheduling of AGVs and YCs with consideration of conflict-free path planning for AGVs as well as capacity constraints on AGV-mate which is also called buffer bracket in blocks,a mixed integer programming model is established to minimize the energy consumption of AGVs and YCs for the given loading/unloading task.A solution method based on a novel bi-level genetic algorithm(BGA),in which the outer and the inner layer search the optimal dispatching strategy for QCs and YCs,respectively,is *** validity of the model and the algorithm is verified by simulation experiments,which take the Port of Qingdao as an example and the performance under different conflicting resolution strategies is *** results show that,for the given task,the proposed solution to conflict-free path and the schedule provided by the algorithm can complete the task with minimum energy consumption without loss of AGVs utilization,and the number of AGV-mates should be adjusted according to the task rather than keeping *** results indicate that our proposed approach could efficiently find solutions within 6%optimality *** consumption is dropped by an average of 15%.

关键词： Automated container terminal conflict-free routing energy saving improved genetic algorithm

Apolipoprotein E2 inhibits mitochondrial apoptosis in pancreatic cancer cells through ERK1/2/CREB/BCL-2 signaling

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Hepatobiliary & Pancreatic Diseases International 2023年第2期22卷 179-189页

作者： Hui Wang Hui-Chao zhou Run-Ling Ren Shao-Xia Du zhong-Kui guo Xiao-Hong Shen Tianjin Institute of Medical&Pharmaceutical Sciences Tianjin 300020China School of Medicine Nankai UniversityTianjin 300071China

Background: Apolipoprotein E2(ApoE2) is a pleiotropic protein that influences several aspects of cancer metabolism and development. Evading apoptosis is a vital factor for facilitating cancer cell growth. However, the role and mechanism of ApoE2 in regulating cell apoptosis of pancreatic cancer remain unclear. Methods: In this study, we firstly detected the m RNA and protein expressions of ApoE2 in PANC-1 and Capan-2 cells by real-time polymerase chain reaction and Western blotting. We then performed TUNEL and flow cytometric analyses to explore the role of recombinant human ApoE2, p CMV6-ApoE2 and si ApoE2 in the apoptosis of PANC-1 and Capan-2 cells. Furthermore, we investigated the molecular mechanism through which ApoE2 affected apoptosis in PANC-1 cells using immunofluorescence, immunoprecipitation, Western blotting and co-immunoprecipitation analysis. Results: ApoE2 phosphorylated ERK1/2 and inhibited pancreatic cancer cell apoptosis. In addition, our data showed that ApoE2/ERK1/2 altered the expression and mitochondrial localization of BCL-2 via activating CREB. ApoE2/ERK1/2/CREB also increased the total BCL-2/BAX ratio, inhibited the opening of the mitochondrial permeability transition pore and the depolarization of mitochondrial transmembrane potential, blocked the leakage of cytochrome-c and the formation of the apoptosome, and consequently, suppressed mitochondrial apoptosis. Conclusions: ApoE2 regulates the mitochondrial localization and expression of BCL-2 through the activation of the ERK1/2/CREB signaling cascade to evade the mitochondrial apoptosis of pancreatic cancer cells. ApoE2 may be a distinct prognostic marker and a potential therapeutic target for pancreatic cancer.

关键词： Apolipoprotein E2 ERK1/2 Mitochondrial apoptosis Pancreatic cancer