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Layered Structural PBAT Composite Foams for Efficient Electromagnetic Interference Shielding

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Nano-Micro Letters 2024年第2期16卷 273-286页

作者： Jianming Yang Hu Wang Yali Zhang Hexin Zhang Junwei Gu School of Chemistry and Chemical Engineering Anhui University of TechnologyMa’anshanAnhui 243032People’s Republic of China Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072ShaanxiPeople’s Republic of China School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuPeople’s Republic of China

The utilization of eco-friendly,lightweight,high-efficiency and high-absorbing electromagnetic interference(EMI)shielding composites is imperative in light of the worldwide promotion of sustainable manufacturing.In this work,magnetic poly(butyleneadipate-coterephthalate)(PBAT)microspheres were firstly synthesized via phase separation method,then PBAT composite foams with layered structure was constructed through the supercritical carbon dioxide foaming and scraping techniques.The merits of integrating ferroferric oxideloaded multi-walled carbon nanotubes(Fe3O4@MWCNTs)nanoparticles,a microcellular framework,and a highly conductive silver layer have been judiciously orchestrated within this distinctive layered configuration.Microwaves are consumed throughout the process of“absorption-reflection-reabsorption”as much as possible,which greatly declines the secondary radiation pollution.The biodegradable PBAT composite foams achieved an EMI shielding effectiveness of up to 68 dB and an absorptivity of 77%,and authenticated favorable stabilization after the tape adhesion experiment.

关键词： Electromagnetic interference shielding Layered structure Supercritical carbon dioxide foaming Poly(butyleneadipateco-terephthalate) Microcellular

Sharp interface direct forcing immersed boundary methods： A summary of some algorithms and applications

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Journal of Hydrodynamics 2016年第5期28卷 713-730页

作者： Jianming Yang Fidesi Solutions LLC PO Box 734 Iowa City IA 52244 USA

Body-fitted mesh generation has long been the bottleneck of simulating fluid flows involving complex geometries. Immersed boundary methods are non-boundary-conforming methods that have gained great popularity in the last two decades for their simplicity and flexibility, as well as their non-compromised accuracy. This paper presents a summary of some numerical algori- thms along the line of sharp interface direct forcing approaches and their applications in some practical problems. The algorithms include basic Navier-Stokes solvers, immersed boundary setup procedures, treatments of stationary and moving immersed bounda- ries, and fluid-structure coupling schemes. Applications of these algorithms in particulate flows, flow-induced vibrations, biofluid dynamics, and free-surface hydrodynamics are demonstrated. Some concluding remarks are made, including several future research directions that can further expand the application regime of immersed boundary methods.

关键词： immersed boundary methods direct forcing sharp interface method strong coupling schemes fluid-structureinteractions Cartesian grid methods

A sharp interface approach for cavitation modeling using volume-of-fluid and ghost-fluid methods

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Journal of Hydrodynamics 2017年第6期29卷 917-925页

作者： Thad Michael Jianming Yang Frederick Stern NSWC Carderock Division 9500 MaeArthur Blvd.West BethesdaMD 20817USA Fidesi Solutions LLC PO Box 734Iowa CityIA 52244USA IIHR-Hydroscience and Engineering University of lowaIowa CityIA 52242USA

This paper describes a novel sharp interface approach for modeling the cavitation phenomena in incompressible viscous flows. A one-field formulation is adopted for the vapor-liquid two-phase flow and the interface is tracked using a volume of fluid（VOF） method. Phase change at the interface is modeled using a simplification of the Rayleigh-Plesset equation. Interface jump conditions in velocity and pressure field are treated using a level set based ghost fluid method. The level set function is constructed from the volume fraction function. A marching cubes method is used to compute the interface area at the interface grid cells. A parallel fast marching method is employed to propagate interface information into the field. A description of the equations and numerical methods is presented. Results for a cavitating hydrofoil are compared with experimental data.

关键词： Incompressible flow two-phase flow cavitation modeling sharp interface method ghost fluid method volume of fluidmethod level set method parallel fast marching method marching cubes method

Cooling load characteristics of indoor spaces conditioned by decoupled radiant cooling unit with low radiant temperature

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Building Simulation 2022年第12期15卷 2067-2079页

作者： Yuying Liang Nan Zhang Huijun Wu Xinhua Xu Jianming Yang Gongsheng Huang Department of Architecture and Civil Engineering City University of Hong KongHong KongChina School of Civil Engineering Guangzhou UniversityGuangzhou 510006China Department of Building Environment&Energy Engineering Huazhong University of Science and TechnologyWuhanChina School of Automation Guangdong Polytechnic Normal UniversityGuangzhou 510665China

Decoupled radiant cooling units(DRCUs)are capable of increasing the cooling capacity without increasing condensation risks even using a much lower cooling temperature than conventional radiant cooling units(CRCUs).However,it is unclear whether DRCUs using low radiant cooling temperature will increase the cooling load of the conditioned indoor spaces.In this study,the cooling load characteristics of a thermal chamber conditioned by a DRCU was investigated through developing a steady-state analysis model suitable for both DRCUs and CRCUs.The total/radiative heat flux,as well as the heat exchange with a thermal manikin and walls were analysed under different surface temperatures of DRCUs.The effect of the emissivity of the thermal chamber’external wall on the cooling load was also investigated.Results indicated that the cooling load under the DRCU was slightly smaller than that under the CRCU when the same operative environment was created.Decreasing the infrared emissivity of the exterior wall’s inner surface could lead to a significant decrease in the cooling load for both the DRCU and CRCU.By decreasing the wall emissivity from 0.9 to 0.1,the total cooling load of the DRCU can be decreased by 8.4%and the heat gain of the exterior wall decreased by 21.6%.This study serves as a reference for developing the analysis model and understanding the load characteristics when DRCUs are used to create the thermal environment for indoor spaces.

关键词： radiant cooling condensation-free computational fluid dynamics cooling load hot and humid climates

Shell characterization and effects on cavity volume of wild Jinjiang oyster Crassostrea ariakensis in different estuaries of China

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Journal of Oceanology and Limnology 2023年第5期41卷 2020-2031页

作者： Qi yang Ao LI Luping WANG Rihao CONG Jianming Yang Guofan ZHANG Wei WANG Li LI Shandong Key Lab of Applied Mycology College of Life SciencesQingdao Agricultural UniversityQingdao 266109China CAS and Shandong Province Key Laboratory of Experimental Marine Biology Center for Ocean Mega-ScienceInstitute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Fisheries Science and Food Production Processes Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China National and Local Joint Engineering Key Laboratory of Ecological Mariculture Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Biology and Biotechnology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China

Jinjiang oyster Crassostrea ariakensis,a species with economic and ecological value,is distributed along the estuaries and coasts of East Asia.With the decline in natural resources,the conservation and aquaculture of this species is urgent.However,studies characterizing their shell shape remain scarce.We investigated the morphological differences in the shells of wild Jinjiang oysters from six populations(Qinzhou,Shanghai,Nantong,Qingdao,and Binzhou hard or muddy bottom)along the coast of China.The color of the shell and adductor muscle scar showed associations with temperature gradient along its geographical distribution.Oyster shape was defined by shell height to shell length ratio,and the ratio varies among geographic locations of the populations.They were found nearly round(Qinzhou and Nantong populations),oval(Qingdao and Binzhou populations),or water-droplet-shaped(Shanghai population).Binzhou populations living on muddy substrates are more elongated than those on hard substrate.In addition,we developed a method to measure the cavity volume in oysters.Correlation and path analysis showed that shell height significantly influenced cavity volume.The synergistic effect of the two factors(the height,length,and width of the shell in pairs)on the cavity volume resulted in differences between northern and southern groups:samples from the southern group(Qinzhou and Shanghai)showed correlation between shell height and shell width,while those from the northern group(Nantong,Qingdao,and Binzhou)showed correlation between shell height and shell length.All populations showed significant correlation between shell height and cavity height,and shell length and cavity length,while the correlation between shell width and cavity width was minimal,which may have been resulted from uneven shell thickness.The linear equation for shell height and cavity volume under different ratios of shell height to length was obtained.In this study,we determined that shell height has the most influence on cavity volume,and specific cavity volu

关键词： shell shape cavity volume correlation analysis path analysis Crassostrea ariakensis

Resource integration optimization of convenience service platforms adopting dynamic service modes in new retail

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Frontiers of Business Research in China 2021年第1期15卷 89-107页

作者： yang yang jianming Yao Business School Renmin University of ChinaBeijing 100872China

This paper analyzes the key issues of resource integration,and proposes a method for solving the problem of achieving efficient resource integration for convenience service platforms that adopt dynamic service modes.This method considers both the service level of collaborative resources under dynamic service modes,and collaborative resources’satisfaction of service modes in the resource integration.In addition,dominant factors needing the most attention during resource integration under dynamic service modes are excavated.Moreover,a model for resource integration optimization is established,and ant colony algorithm is used to solve the problem.Finally,a case is used to verify the feasibility of the method.

关键词： Convenience service platforms Dynamic service modes Resource integration Ant colony algorithm Collaborative resources

Dynamic performance and energy efficiency of reflective and insulative composite coating on building exterior wall

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Building Simulation 2023年第12期16卷 2245-2259页

作者： Guangpeng Zhang Huijun Wu Jia Liu Jianming Yang Huakun Huang Yujie Ding Lei Xie School of Civil Engineering Guangzhou UniversityGuangzhou 510006China Guangdong Provincial Key Laboratory of Building Energy Efficiency and Application Technologies Guangzhou 510006China School of Automation Guangdong Polytechnic Normal UniversityGuangzhou 510665China School of Computer Science and Cyber Engineering Guangzhou UniversityGuangzhou 510006China

Reflective and insulative composite coatings are a new energy-saving material with high solar reflectance and extremely low thermal conductivity for buildings.The optimization and impact of high solar reflectance and low thermal conductivity on the insulating capacity of walls remain uncertain.This work investigates the dynamic thermal performance and energy efficiency of a reflective and insulative composite coating in regions with hot summer and warm winter.A simplified thermal resistance-heat capacitance model of an exterior building wall is established to predict thermal performance.The dynamic temperature and heat flow of the wall are predicted to reduce heat loss through the interior surface of the wall and compared to the conventional coating.The specific impact of the thermal conductivity and solar reflectance of the coating on the heat loss is further investigated to minimize heat loss of the wall.This research shows that the composite coating shows better performance on adjusting outdoor climate change than the other coating.Compared with cement,it reduces the maximum temperature of the exterior surface of the wall by 7.45°C,and the heat loss through the interior surface of the wall by 38%.The heat loss is reduced with the increase of solar reflectance and the reduction of thermal conductivity.The results can provide a useful reference and guidance for the application of reflective and insulative composite coating on building exterior wall to promote their energy-saving use on building envelopes.

关键词： reflective and insulative composite coating exterior wall building insulation solar reflectance thermal conductivity

Surface Passivation and Energetic Modification Suppress Nonradiative Recombination in Perovskite Solar Cells

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Nano-Micro Letters 2022年第7期14卷 32-42页

作者： Wei Dong Wencheng Qiao Shaobing Xiong Jianming Yang Xuelu Wang Liming Ding Yefeng Yao Qinye Bao Shanghai Key Laboratory of Magnetic Resonance East China Normal UniversityShanghai 200241People’s Republic of China School of Physics and Electronic Science East China Normal UniversityShanghai 200241People’s Republic of China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190People’s Republic of China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006ShanxiPeople’s Republic of China

Surface passivation via post-treatment is an important strategy for improving power conversion efficiency and operational stability of perovskite solar cells.However,so far the interaction mechanisms between passivating additive and perovskite are not well understood.Here,we report the atomic-scale interaction of surface passivating additive 2,2-difluoroethylammonium bromine(2FEABr)on the MAPbI_(3).It is found that the bulky 2FEA+cations tend to distribute at film surface,while the Br−anions diffuse from surface into bulk.A combination of 19F,207Pb,and 2H solid-state NMR further reveal the Br−anions’partial substitution for the I−sites,the restricted motion of partial MA+cations,and the firmed perovskite lattices,which would improve charge transport and stability of the perovskite films.Optical spectroscopy and ultraviolet photoelectron spectroscopy demonstrate that the 2FEABr induced surface passivation and energetic modification suppress the nonradiative recombination loss.These findings enable the efficiency of the p-i-n structured PSC significantly increasing from 19.44 to 21.06%,accompanied by excellent stability.Our work further establishes more knowledge link between passivating additive and PSC performance.

关键词： Passivation Solid-state NMR Charge transport Perovskite solar cell

杨建明:培养跨学科、跨领域、跨文化的学科交叉融合意识

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设计 2022年第14期35卷 69-79页

作者：李杰李叶杨建明不详北京理工大学艺术与设计学院

《设计》杨建明《设计》:请您简单介绍一下北京理工大学艺术与设计学院的基本情况及学院在工业设计专业领域内教学特色。杨建明:首先,学院的发展离不开学校的支持和推动。作为中国共产党创办的第一所理工科大学,北京理工大学是国家历批... 详细信息

《设计》杨建明《设计》:请您简单介绍一下北京理工大学艺术与设计学院的基本情况及学院在工业设计专业领域内教学特色。杨建明:首先,学院的发展离不开学校的支持和推动。作为中国共产党创办的第一所理工科大学,北京理工大学是国家历批次重点建设高校,首批进入国家“211工程”和“985工程”的高校,也首批进入了“世界一流大学”建设高校的A类行列。

关键词：北京理工大学世界一流大学理工科大学学科交叉融合 985工程 211工程艺术与设计杨建明