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A CAD-BEM geometry transformation method for face-based primary geometric input based on closed contour recognition

Building Simulation 2024年第2期17卷 335-354页

作者： Jun xiao Hao zhou Shiji Yang Deyin Zhang Borong Lin Department of Building Science School of ArchitectureTsinghua UniversityBeijing100084China Key Laboratory of Eco Planning&Green Building Ministry of EducationTsinghua UniversityBeijing100084China Institute for Urban Governance and Sustainable Development Tsinghua UniversityBeijing100084China

Performance analysis during the early design stage can significantly reduce building energy ***,it is difficult to transform computer-aided design(CAD)models into building energy models(BEM)to optimize building *** model structures for CAD and BEM are *** this study,geometry transformation methods was implemented in BES tools for the early design stage,including auto space generation(ASG)method based on closed contour recognition(CCR)and space boundary topology calculation *** program is developed based on modeling tools SketchUp to support the CAD format(like*.stl,*.dwg,*.ifc,etc.).It transforms face-based geometric information into a zone-based tree structure model that meets the geometric requirements of a single-zone BES combined with the other thermal parameter inputs of the *** addition,this study provided a space topology calculation method based on a single-zone BEM *** program was developed based on the SketchUp modeling tool to support additional CAD formats(such as*.stl,*.dwg,*.ifc),which can then be imported and transformed into*.*** to current methods mostly focused on BIM-BEM transformation,this method can ensure more modeling *** method was integrated into a performance analysis tool termed MOOSAS and compared with the current version of the transformation *** were tested on a dataset comprising 36 conceptual models without partitions and six real cases with detailed *** ensures a transformation rate of two times in any bad model condition and costs only 1/5 of the time required to calculate each room compared to the previous version.

关键词： geometry transformation building energy model computer aid design closed contour recognition

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Modular Soft Robotic Crawlers Based on Fluidic Prestressed Composite Actuators

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Journal of Bionic Engineering 2024年第2期21卷 694-706页

作者： Zefeng Xu Linkai Hu Longya xiao hongjie Jiang Yitong zhou Shien-Ming Wu School of Intelligent Engineering South China University of TechnologyGuangzhou511442China School of Mechanical and Electrical Engineering Guangzhou UniversityGuangzhou510006China

Soft robotic crawlers have limited payload capacity and crawling *** study proposes a high-performance inchworm-like modular robotic crawler based on fluidic prestressed composite(FPC)*** FPC actuator is precurved and a pneumatic source is used to flatten it,requiring no energy cost to maintain the equilibrium curved *** and depressurizing the actuators generate alternating stretching and bending motions of the actuators,achieving the crawling motion of the robotic ***-modal locomotion(crawling,turning,and pipe climbing)is achieved by modular reconfiguration and gait *** analytical kinematic model is proposed to characterize the quasi-static curvature and step size of a single-module *** configurations of robotic crawlers are fabricated to demonstrate the crawling ability of the proposed design.A set of systematic experiments are set up and conducted to understand how crawler responses vary as a function of FPC prestrains,input pressures,and actuation *** per the experiments,the maximum carrying load ratio(carrying load divided by robot weight)is found to be 22.32,and the highest crawling velocity is 3.02 body length(BL)per second(392 mm/s).Multi-modal capabilities are demonstrated by reconfiguring three soft crawlers,including a matrix crawler robot crawling in amphibious environments,and an inching crawler turning at an angular velocity of 2/s,as well as earthworm-like crawling robots climbing a 20 inclination slope and pipe.

关键词： Soft robot Soft crawler Fluidic prestressed composite Kinematic model Enhanced loading Multi-modal capability

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Online estimation and characteristic analysis of double nugget diameters during aluminum/steel resistance spot welding process

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Journal of Iron and Steel Research International 2024年第8期31卷 2053-2067页

作者： Kang zhou Wen-xiao Yu Bao-kai Ren Gang Wang School of Mechatronical Engineering Beijing Institute of TechnologyBeijing 100081China

Online estimation of the double nugget diameters was performed by means of a back propagation neural *** double nugget diameters were obtained using actual welding experiment and numerical simulation,according to different characteristics of aluminum nugget and steel *** input of the neural network was some key characteristic parameters extracted from dynamic power signal,which were peak point,knee point and their variation rate over time,as well as heat energy delivered into the welding *** architecture of the neural network was confirmed by confirming the number of neurons in hidden layer through a series of *** key parameters of the neural network were obtained by means of training 81 arrays of data ***,the neural network was used to test the remaining 20 arrays of verifying data set,and the results showed that both of the mean errors for the two nugget diameters were below 3%.In addition,corresponding analyses showed that the accuracy of two nugget diameters was higher than that of tensile-shear strength.

关键词： Resistance spot welding Aluminum Steel Double nugget Dynamic power signal.Neural network

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Peer-to-Peer Trading in Distribution Systems with the Utility's Operation

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 629-638页

作者： Xuanyi xiao Feng Wang Mohammad Shahidehpour Yujia Zhai Quan zhou Department of Electrical and Information Engineering Hunan UniversityChangshaChina Robert W.Galvin Center for Electricity Innovation Ilinois Institute of TechnologyChicagoIL60616USA

To realize a liberalized peer-to-peer (P2P) electricity market in distribution systems with network security, this paper develops a general framework for P2P trading in distribution systems with the utility's operation. The model is formulated as a bi-level programming. The utility's operation is an upper level problem, where a calculation method of network usage charges for P2P trading is also proposed. Peers' P2P trading is a lower level problem. An iterative algorithm based on analytical target cascading (ATC) is proposed to solve the model, where the interactions between utility and peers are presented. Numerical results on the IEEE 33-bus system demonstrate that the proposed method realizes a liberalized P2P market and ensures network security in distribution systems.

关键词： Distribution system peer-to-peer trading electricitymarket distributed energyresources(DERs) analytical target cascading(ATC)

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Design of an on‑chip wavelength conversion device assisted by an erbium‑ytterbium co‑doped waveguide amplifier

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Frontiers of Optoelectronics 2024年第2期17卷 51-60页

作者： Chen zhou Xiwen He Mingyue xiao Deyue Ma Weibiao Chen Zhiping zhou School of Physical Sciences University of Science and Technology of ChinaHefei 230026China Aerospace Laser Technology and System Department Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Hangzhou Aijie Optoelectronic Technology Co.Ltd. Hangzhou 311400China

In current documented studies,it has been observed that wavelength converters utilizing AlGaAsOI waveguides exhibit suboptimal on-chip wavelength conversion efficiency from the C-band to the 2μm band,generally falling below−20.0 *** address this issue,we present a novel wavelength conversion device assisted by a waveguide amplifier,incorporating both AlGaAs wavelength converter and erbium-ytterbium co-doped waveguide amplifier,thereby achieving a notable conversion efficiency exceeding 0 *** noteworthy enhancement in efficiency can be attributed to the specific dispersion design of the AlGaAs wavelength converter,which enables an upsurge in conversion efficiency to−15.54 dB under 100 mW of pump ***,the integration of an erbium-ytterbium co-doped waveguide amplifier facilitates a loss compensation of over 15 *** the use of external optical amplifiers,this device enables efficient and high-bandwidth wavelength conversion,showing promising applications in various fields,such as optical communication,sensing,imaging,and beyond.

关键词： Silicon-based optoelectronics Wavelength conversion Waveguide amplifier 2μm band

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Measured and Simulated Performance of a Four-Segmented Clover Detector

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Chinese Physics Letters 2012年第4期29卷 51-53页

作者： ZHANG Ning-Tao LEI Xiang-Guo ZHANG Yu-Hu zhou xiao-hong LIU Min-Liang GUO Ying-Xiang FANG Yong-De LI Shi-Cheng zhou Hou-Bing DING Bing WANG Hai-Xia WU xiao-Guang HE Chuang-Ye ZHENG Yun Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000 Graduate School of Chinese Academy of Sciences Beijing 100049 China Institute of Atomic Energy Beijing 102413

Gamma rays with energies between 80keV and 1500keV produced by 133Ba and 152Eu standard sources are measured with the clover *** efficiencies and add-back factors are determined in both crystals and full clover *** add-back characteristics have been calculated using Monte-Carlo simulation code *** simulation and measurements agree very well.

关键词： detector keV Geant4

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Hot Compression Behavior and Tensile Property of a Novel Ni-Co-Based Superalloy Prepared by Electron Beam Smelting Layered Solidification Technology

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Acta Metallurgica Sinica(English Letters) 2024年第2期37卷 283-292页

作者： Yong-Chao Gai Rui Zhang Chuan-Yong Cui Zi-Jian zhou Yi Tan Yi-zhou zhou xiao-Feng Sun Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of Materials Science and EngineeringDalian University of TechnologyDalian116024China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China

The hot compression behavior and tensile strength after compression of a new Ni-Co-based superalloy produced using electron beam smelting layered(EBSL)solidification technology were *** compression tests were performed at temperatures of 1120℃and 1150℃,with strain rates of 1 s^(-1) and 0.01 s^(-1),reaching a true strain of *** strength was evaluated at room *** results revealed that this EBSL technology accelerates dynamic recrystallization(DRX),without compromising the strength of alloy.A significant correlation between the volume fraction of DRX and the strain rate was observed,with higher fractions at lower strain rates,leading to higher tensile ***,at the same strain rate,the specimens compressed at 1120℃exhibited higher tensile strength due to undissolvedγ′*** solution and aging heat treatment,the alloy maintained high tensile *** results suggested that the EBSL Ni-Co-based superalloy offers excellent prospects for practical applications.

关键词： Ni-Co-based superalloy Hot deformation Electron beam smelting Tensile strength

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Metal-encapsulated nitrogen-doped carbon nanotube arrays electrode for enhancing sulfion oxidation reaction and hydrogen evolution reaction by regulating of intermediate adsorption

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Chinese Chemical Letters 2024年第8期35卷 533-538页

作者： xiao Li Wanqiang Yu Yujie Wang Ruiying Liu Qingquan Yu Riming Hu Xuchuan Jiang Qingsheng Gao hong Liu Jiayuan Yu Weijia zhou Institute for Advanced Interdisciplinary Research(iAIR) School of Chemistry and Chemical EngineeringUniversity of JinanJi’nan 250022China Institute for Smart Materials&Engineering School of Materials Science and EngineeringUniversity of JinanJi’nan 250022China College of Chemistry and Materials Science and Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and ApplicationsJinan UniversityGuangzhou 510632China State Key Laboratory of Crystal Materials Shandong UniversityJi’nan 250100China

For treatment of sulfion-containing wastewater,coupling the electrochemical sulfion oxidation reaction(SOR)with hydrogen evolution reaction(HER)can be an ideal way for sulfur and H_(2)resources ***,we synthesize a metal-modified carbon nanotube arrays electrode(Co@N-CNTs/CC)for SOR and *** electrode has excellent performance for SOR and HER attributed to the unique array *** can achieve 99.36 mA/cm^(2)at 0.6 V for SOR,and 10 mA/cm^(2)at 0.067 V for *** functional theory calculations verify that metal modification is able to regulate the electronic structure of carbon nanotube,which is able to optimize the adsorption of *** Co@N-CNTs/CC as bifunctional elec-trodes to establish a hybrid electrolytic cell can reduce about 67%of energy consumption compared with the traditional water splitting electrolytic ***,the hybrid electrolytic cell is used to treat actual sulfion-containing wastewater,achieving the sulfur yield of 30 mg h^(−1)cm^(−2)and the hydrogen production of 0.64 mL/min.

关键词： Sulfion oxidation reaction Hydrogen evolution reaction Nitrogen-doping carbon nanotube Core-shell structure Resource upgrade

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Signature Inversion of Yrast Band in Odd-Odd ^(162)Lu Nucleus

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Chinese Physics Letters 1996年第4期13卷 257-260页

作者： ZHANG Yu-hu zhou xiao-hong ZHAO Qing-zhong SUN Xiang-fu LEI Xiang-guo GUO Ying-xiang LIU Zhong CHEN Xing-feng ZHU Yong-tai WEN Shu-xian YUAN Guan-jun LIU Xiang-an Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China Institute of Atomic Energy Beijing 102413

High spin states of the odd-odd ^(162)Lu nucleus have been studied via ^(147)Sm(^(19)F,4nγ)reaction at 95MeV beam *** scheme for yrast band based on π[h_(11/2)]v[i_(13/2)]quasiparticle configuration was established up to I^(π)-(23^(-))for the first *** band shows the signature inversion in energy before backbending generally appeared in this mass *** is stressed that the signature splitting in 162Lu is larger than that in 160 Tm nucleus.

关键词： energy signature

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Integrated transcriptomics and metabolomics analysis reveal the molecular mechanism of unsaponifiable matter in delaying aging

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Food Science and Human Wellness 2024年

作者： Dan hong Aijin Ma xiao xiao Mengge Ma zhou Chen Siting Li Yingmin Jia School of Food and Health， Beijing Technology and Business University

Aging is one of the causes of cognitive dysfunction， which seriously affects people's quality of life. Unsaponifiable matter (USM) has antioxidant potential， but the molecular mechanisms that ameliorate aging and cognitive dysfunction are unknown. In this study， we used a galactose-induced brain aging mouse model and systematically analyzed the mechanism of USM in delaying aging in mice by detecting changes in serum and brain by metabolomics and *** was compared with the model group， and non-targeted metabolomics identified 68 (15 up- regulated，53down-regulated) differentially metabolites，andtranscriptomics identified 303 differentially expressed genes (228 up-regulated， 75 down-regulated). Combined multi-omics analyses showed that USM maintains normal brain function by regulating glycolytic processes， the tricarboxylic acid cycle (TCA)， tryptophan metabolism， pyrimidine metabolism， the alanine， aspartate， and glutamate metabolism， and P38MAPK pathway. Meanwhile， USM increased neurotransmitter release from GABAergic synapses and cholinergic synapses by regulating synaptic vesicle cycling. In summary， USM increased energy metabolism and enhanced brain nerve signaling in the mouse brain， thereby delaying brain aging. This investigation offers novel perspectives into the molecular mechanism of USM to mitigate brain aging.

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