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Tradeoff between heating energy demand in winter and indoor overheating risk in summer constrained by building standards

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Building Simulation 2021年第4期14卷 987-1003页

作者： Ran Wang Shilei Lu Wei Feng bowen xu School of Environment Science and Engineering Tianjin University92 Weijin RoadTianjin300072China Tianjin Key Laboratory of Built Environment and Energy Application Tianjin UniversityTianjin300350China Lawrence Berkeley National Laboratory BerkeleyCA94720USA

Evidence indicates that improvement of thermal performance of building envelope has the potential for aggravating the indoor overheating risk in summer. On the other hand, evolving building standards continue to strengthen the requirements for thermal performance to achieve the energy-saving target. Therefore, this study quantifies the interaction effect between building standards-oriented building design, heating energy demand in winter, and indoor overheating risk in summer. Building databases with different energy efficiency levels are generated using a randomly generated method. Uncertain variables include not only 13 design parameters but also the running state of natural ventilation and external shading. The indoor overheating risk is assessed in terms of severity and duration. Finally, a multi-objective optimization model integrating metamodels and the non-dominated sorting genetic algorithm is proposed to balance heating energy demand in winter and indoor overheating risk in summer. Results indicate that building standards tend to aggravate overheating risk in summer: the duration and severity of high-performance buildings increased by 40.6% and 24.2% than that of conventional-performance buildings. However, window ventilation could offset the adverse effect, and mitigation of duration and severity can be up to 85.2% and 62.1% for high-performance buildings. Window ventilation can weaken the conflict between heating energy demand in winter and overheating risk in summer. As heating energy demand increased from 6.1 to 67.3 kWh/m^(2), the overheating risk changes little that the duration of overheating risk decreased from 17.5% to 15.6% and severity decreased from 8.7 ℃ to 8.3 ℃.

关键词： climate change indoor overheating risk energy codes building design natural ventilation

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A Practical Predefined-Time Stability Criterion and Its Application to Uncertain Nonlinear Systems

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Journal of Systems Science & Complexity 2024年第6期37卷 2556-2578页

作者： xu Hao YU Dengxiu SUI Shuai xu bowen CHEN C.L.Philip Unmanned System Research Institute Northwestern Polytechnical UniversityXi'an 710072China College of Science Liaoning University of TechnologyJinzhou 121001China School of Artificial Intelligence Optics and ElectronicsNorthwestern Polytechnical UniversityXi'an 710072China School of Computer Science and Engineering South China University of Technology and Pazhou LabGuangzhou 510641China

In this paper,the singularity-free predefined-time fuzzy adaptive tracking control problem is studied for non-strict feedback(NSF)nonlinear systems considering mismatched external *** innovative practical predefined-time stability(PPTS)criterion is proposed to provide the theoretical basis for subsequent control *** to the existing predefined-time stability(PTS)criterion,this criterion has a broader application range and can solve the control design issues of nonlinear systems with system *** logic systems(FLSs)are employed to identify unknown nonlinear *** on the backstepping control technology,a singularity-free predefined-time control(PTC)design method is proposed,in which the hyperbolic tangent function is utilized to avoid the singular problem,and the nature of fuzzy basis function is adopted to resolve the algebraic loop *** PPTS of the closed-loop NSF nonlinear system is proven with the Lyapunov theory and the proposed PPTS ***,the efficiency of the presented PTC design method is verified by several sets of simulations on a single link manipulator system.

关键词： Fuzzy adaptive control nonlinear systems practical predefined-time stability predefinedtime control singularity-free control

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The Novel Instance Segmentation Method Based on Multi-Level Features and Joint Attention

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Chinese Journal of Electronics 2023年第5期32卷 1160-1168页

作者： xu bowen LU Yinan WU Tieru GUO Xiaoxin College of Computer Science and Technology Jilin University College of Mathematics Jilin University

Instance segmentation is an important task in computer vision. In order to enhance the multilevel features expression ability of the segmentation networks, a novel module is proposed in this paper. Firstly,we design a weighted bi-directional feature fusion way by computing the weight distribution function of bi-directional feature pyramid network. Secondly, we propose a joint attention mechanism to effectively filter different levels of feature information by adopting serial and parallel ways to combine the channel attention and spatial attention modules. At the same time, the module uses dynamic convolution to stabilize the calculation speed while improve the 6.7% mean average precision of *** experiments on the COCO dataset demonstrate that the module can effectively improve the performance of the existing instance segmentation networks.

关键词： Computer vision Convolution Neural networks Bidirectional control Information filters Real-time systems Task analysis

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An investigation of the influence of near-fault ground motion parameters on the pile's response in liquefiable soil

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Earthquake Engineering and Engineering Vibration 2018年第4期17卷 729-745页

作者： Hui Shuqing Tang Liang Zhang Xiaoyu Wang Youqing Ling Xianzhang xu bowen School of Civil Engineering Harbin Institute of Technology State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences

The performance of a soil-pile system can be significantly influenced by ground motion parameters. However, few research efforts have been performed to provide a complete description of the influence of key ground motion parameters on the pile’s behavior in liquefiable soil. In this study, a three-dimensional finite element（FE） model, incorporating a multisurface plasticity solid-fluid fully coupled formulation soil constitutive model, is developed and calibrated based on centrifuge test data. Seventy-two near-fault non-pulse-like（NF-NP） and seventy-two near-fault pulse-like（NF-P） ground motion records are studied with the calibrated FE model to distinguish the effects of several common ground motion parameters soon afterwards. Base on the parametric study results, a simple index, RPGV/PGA（i.e., the ratio of peak ground velocity（PGV） to peak ground acceleration（PGA））, shows its capability on characterizing the pile behavior under both NF-NP and NF-P ground motions. Furthermore, two equations are developed to characterize the relationships between the RPGV/PGA as well as the maximum pile’s moments and displacements. In general, this study can be helpful to gain new insights on the influence of typical index parameters for near-field ground motions on the response of the pile foundation in liquefiable soil.

关键词： seismic response predictive equations near-fault ground motion pile foundation liquefaction

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Design of a 35 kV high-temperature superconducting synchronous machine with optimized field winding

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第9期25卷 687-700页

作者： Chao LUO bowen xu Jien MA Jiancheng ZHANG Jiabo SHOU Youtong FANG College of Electrical Engineering Zhejiang UniversityHangzhou 310027China Electric Power Research Institute of State Grid Zhejiang Electric Power Corporation Hang Zhou 310014China

This paper proposes the application of high-voltage stator-cable windings in superconducting machines,based on the characteristics of strong magnetic fields and large air ***-linked polyethylene cable winding can be employed to achieve a rated voltage of 35 kV in direct-current(DC)-field superconducting machines,thereby enabling a direct connection between the superconducting machine and the power grid,eliminating the need for *** first,through finite element analysis,demonstrate that the proposed high-voltage high-temperature superconducting machine not only meets the requirement of a 35 kV-rated voltage,but also exhibits minimal flux leakage,torque fluctuation,and harmonic *** then compare three candidate types to discuss the tradeoff between the multi-group superconducting field winding arrangement and machine *** propose inverted trapezoidal superconducting field winding as a promising candidate,because it has minimal superconductivity material usage,the largest safety margin for the superconducting coils(SCs),low thrust ripple,and low total harmonic distortion with the desired 35 kV-rated ***,through large-scale design parameter sweeping,we show how we selected the optimal parameters for field winding and validated them by the finite element method.

关键词： High-voltage stator-cable windings Superconducting machines Inverted trapezoidal field winding Total harmonic distortion

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Unravelling the nature of the active species as well as the Mn doping effect over gamma-Al_(2)O_(3) catalyst for eliminating AsH_(3) and PH_(3)

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Journal of Environmental Sciences 2024年第2期136卷 213-225页

作者： bowen xu Jiaxin Qu xueqian Wang Langlang Wang Yu Pu Ping Ning Yibing Xie Yixing Ma Qiang Ma Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China School of Architecture and Civil Engineering Chengdu UniversityChengdu 610106China

To investigate the enhancing effect of Mn on the performance of simultaneous catalytic oxidation of AsH_(3)and PH_(3)by CuO-Al_(2)O_(3)in a reducing atmosphere under micro-oxygen conditions,Cu-Mn modifiedγ-Al_(2)O_(3)catalysts were *** characteristics of the catalysts showed that Mn reduced the crystallinity of the active CuO component,increased the number of oxygen vacancies and acidic sites on the catalyst surface,enhanced the mobility of surface oxygen,and the interaction between copper and manganese promoted the redox cycling ability of the catalysts and improved their oxidation performance,which increased the conversion frequency(TOF)by 2.54×10^(-2)to 3.07×10^(-2)sec^(-1).On the other hand,the introduction of Mn reduced the production of phosphate and As_(2)O_(3)on the catalyst surface by30.96%and 44.9%,which reduced the coverage and inerting of the active sites by phosphate and As_(2)O_(3),resulting in an 8 hr(6 hr)improvement in the stability of PH_(3)(AsH_(3))removal.

关键词： AsH_(3)-PH_(3)removal Oxygen activation Mn doping Stability enhancement

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Advances in the study of mitophagy in osteoarthritis

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2024年第3期25卷 197-211页

作者： Hong CAO xuchang ZHOU bowen xu Han HU Jianming GUO Miao WANG Nan LI Jun ZOU Department of Sport Rehabilitation Shanghai University of SportShanghai 200438China National Key Laboratory of Immunity and Inflammation Naval Medical UniversityShanghai 200433China School of Sport Medicine and Rehabilitation Beijing Sport UniversityBeijing 100084China

Osteoarthritis(OA),characterized by cartilage degeneration,synovial inflammation,and subchondral bone remodeling,is among the most common musculoskeletal disorders globally in people over 60 years of *** initiation and progression of OA involves the abnormal metabolism of chondrocytes as an important pathogenic *** degeneration features mitochondrial dysfunction as one of the important causative factors of abnormal chondrocyte ***,maintaining mitochondrial homeostasis is an important strategy to mitigate *** is a vital process for autophagosomes to target,engulf,and remove damaged and dysfunctional mitochondria,thereby maintaining mitochondrial *** studies have revealed a strong association between mitophagy and OA,suggesting that the regulation of mitophagy may be a novel therapeutic direction for *** reviewing the literature on mitophagy and OA published in recent years,this paper elaborates the potential mechanism of mitophagy regulating OA,thus providing a theoretical basis for studies related to mitophagy to develop new treatment options for OA.

关键词： Mitophagy Osteoarthritis Chondrocyte Mitochondria Apoptosis

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Advances in the study of protein folding and endoplasmic reticulum-associated degradation in mammal cells

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2024年第3期25卷 212-232页

作者： Hong CAO xuchang ZHOU bowen xu Han HU Jianming GUO Yuwei MA Miao WANG Nan LI Jun ZOU Department of Sport Rehabilitation Shanghai University of SportShanghai 200438China National Key Laboratory of Immunity and Inflammation Naval Medical UniversityShanghai 200433China

The endoplasmic reticulum is a key site for protein production and quality *** than one-third of proteins are synthesized and folded into the correct three-dimensional conformation in the endoplasmic ***,during protein folding,unfolded and/or misfolded proteins are prone to occur,which may lead to endoplasmic reticulum *** can monitor the quality of the proteins produced by endoplasmic reticulum quality control(ERQC)and endoplasmic reticulum-associated degradation(ERAD),which maintain endoplasmic reticulum protein homeostasis by degrading abnormally folded *** underlying mechanisms of protein folding and ERAD in mammals have not yet been fully ***,this paper reviews the process and function of protein folding and ERAD in mammalian cells,in order to help clinicians better understand the mechanism of ERAD and to provide a scientific reference for the treatment of diseases caused by abnormal ERAD.

关键词： Endoplasmic reticulum-associated degradation(ERAD) Protein folding Ubiquitination Retrotranslocation

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Advances in Medical Magnesium Alloy Surface Modification for Corrosion Resistance Improvement

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稀有金属材料与工程 2024年第11期53卷 3084-3100页

作者： Zhao Chen Mu Weiyi Ji Shouchang Li Huan He Fei Jing Lei xu bowen Liang Lisi School of Metallurgical Engineering Xi'an University of Architecture and TechnologyXi'an 710055China Northwest Institute for Nonferrous Metal Research Xi'an 710016China Northwest Nonferrous Metal Baoji Innovation Research Institute Baoji 721013China Shaanxi Key Laboratory of Biomedical Metal Materials Northwest Institute for Nonferrous Metal ResearchXi'an 710016China

Since the magnesium and magnesium alloys have good load transmission,exceptional biosafety,unique biodegradability,etc,they have significant application possibilities in the field of medical ***,excellent corrosion resistance is one of the paramount prerequisites for magnesium and magnesium alloys as medical ***,magnesium alloys exhibit poor corrosion resistance,leading to rapid degradation in physiological environments due to high corrosion *** premature degradation,before completing their intended service life,compromises their structural integrity,severely limiting their clinical *** modification treatment of magnesium alloy to improve corrosion resistance has become a research hotspot of medical magnesium *** study primarily focused on the research advancements in the corrosion resistance enhancement of medical magnesium *** developmental trajectory and characteristics of medical magnesium alloys were ***,surface modification techniques such as micro-arc oxidation and ion implantation,as well as microstructure and properties of magnesium alloy surfaces after surface modification were *** formation mechanisms of various coatings were discussed,and their structures and properties were *** impact of coatings on the degradation rate of magnesium alloys was elucidated,aiming to identify key issues and potential solutions in the implementation and application of surface modification for medical magnesium *** were also provided,presenting the research directions for surface modification of medical magnesium alloys.

关键词： magnesium alloys surface modification degradation ratio corrosion resistance

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An Empirical Study of the Relationship among Population Mobility Industrial Structure Upgrading, and Economic Growth-Based on the SPVAR Model

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Proceedings of Business and Economic Studies 2021年第4期4卷 14-25页

作者： bowen xu Yang Lu School of Economics Jiangxi University of Finance and EconomicsNanchang 330013China

Based on the inter-provincial panel data for 31 provinces in China from 2000 to 2019,and incorporating geospatial factors,a spatial panel vector autoregressive(SPVAR)model consisting of population mobility,industrial structure upgrading,and economic growth is *** space-time impulse response function is used to analyze the space-time conduction of exogenous variables on the impact of three endogenous *** study found that first,the population influx barely benefited the industrial structure upgrading and economic ***,the upgrading of the industrial structure would aggravate the population mobility in the province,causing low-level laborers to leave the province in shortterm,but in long-term,there would be influx of ***,the economic growth in developed regions plays a significant role in promoting the industrial development of their province and population-rich provinces,but it has less impact on provinces with high-level industrial ***,policy recommendations are provided in regard to the benign interaction among population mobility,industrial structure upgrading,and economic growth in addition to clarifying the idea of economic development,implementing correct population policies,and promoting the coordinated regional development.

关键词： Population movement Industrial structure upgrading Economic growth Space panel VAR model

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