检索结果-内蒙古大学图书馆

FUNDAMENTAL STUDY ON MACHINE LEARNING MODEL FOR RC BEAM SUBJECTED TO SEVERAL LOADING AND CRACK REPAIR

AIJ Journal of Technology and design 2025年第77期31卷 240-245页

作者： Matsubayashi, Miki Sugawara, Sota Nakamura, Mizuki Takase, Yuya Division of Engineering Muroran Institute of Technology Japan Division of Sustainable and Environmental Engineering Muroran Institute of Technology Japan College of Design and Manufacturing Technology Muroran Institute of Technology Japan

Japan is prone to large earthquakes. Therefore, buildings may be subjected to multiple seismic loads. In this study, the RC cantilever specimens were subjected to shear loads three times. As the results of the test, as the number of loads increased, the crack width opened;and the stiffness decreased without repair. However, with crack repair, the crack width became small;and the stiffness recovered slightly. In addition, the machine learning model were constructed;and then it could reasonably estimate the envelope curves. © 2025 Architectural institute of Japan. All rights reserved.

关键词： Repair

来源：评论

学校读者我要写书评

暂无评论

A Geometric Model Simplification Strategy for CFD Simulation of the Cockpit Internal Environment

引用

Computer Modeling in engineering & Sciences 2025年第2期142卷 1545-1564页

作者： Meng Zhao Jiaao Liu YudiLiu Zhengwei Long Tianjin Key Lab.of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin UniversityTianjin300072China Architectural Institute China Railway Design CorporationTianjin300308China Environmental Control Oxygen Department Shanghai Aircraft Design and Research InstituteCOMACShanghai201210China

Computational Fluids Dynamics(CFD)simulations are essential for optimizing the design of a cockpit’s internal environment,but the complex geometric models consume a significant amount of computational resources and *** simplification of geometric models may result in inaccurate calculations of physical *** address this issue,this study establishes a geometric model simplification strategy and successfully applies it to a *** implementation of the whole approach is divided into three steps,summarized in three methods,namely Sensitivity Analysis Method(SAM),Detail Suppression Method(DSM),and Evaluation Standards Method(ESM).Sensitivity analysis of the detailed features of the geometric model is performed using the adjoint *** details of the geometric model are suppressed based on the principle of curvature *** evaluation,the suppression degrees of detailed features with different sensitivity levels are *** results demonstrate that this strategy can be employed to achieve precise simplification standards,thereby avoiding excessive deviations caused by arbitrary simplification and reducing the significant costs associated with trial-and-error simplification.

关键词： CFD model simplification cockpit sensitivity analysis detail suppression

来源：评论

学校读者我要写书评

暂无评论

Effects of biomass co-pyrolysis and herbaceous plant colonization on the transformation of tailings into soil like substrate

引用

Journal of environmental Sciences 2025年第1期147卷 230-243页

作者： Bin Zhu Meiyan Si Xin Xie Ximin Yan Jianhong Huang Senlin Tian Ping Ning Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China Guizhou Research Institute of Coal Mine Design Co. Ltd.Guiyang 550025China

Enhancing soil organic matter characteristics,ameliorating physical structure,mitigating heavy metal toxicity,and hastening mineral weathering processes are crucial approaches to accomplish the transition of tailings substrate to a soil-like *** incorporation of biomass co-pyrolysis and plant colonization has been established to be a significant factor in soil substrate formation and soil pollutant *** this,there is presently an absence of research efforts aimed at synergistically utilizing these two technologies to expedite the process of mining tailings soil substrate *** current study aimed to investigate the underlying mechanism of geochemical changes and rapid mineral weathering during the process of transforming tailings substrate into a soil-like substrate,under the combined effects of biomass co-smoldering pyrolysis and plant *** findings of this study suggest that the incorporation of smoldering pyrolysis and plant colonization induces a high-temperature effect and biological effects,which enhance the physical and chemical properties of tailings,while simultaneously accelerating the rate of mineral *** improvements include the amelioration of extreme pH levels,nutrient enrichment,the formation of aggregates,and an increase in enzyme activity,all of which collectively demonstrate the successful attainment of tailings substrate *** of the acceleratedweathering was verified by phase and surfacemorphology analysis using X-ray diffraction and scanning electron *** corrosion and fragmentation on the surface *** weathering resulted in corrosion and fragmentation of the surface of the treated *** study confirms that co-smoldering pyrolysis of biomass,combined with plant colonization,can effectively promote the transformation of tailings into soil-like *** method has can effectively address the key challenges that have previously hind

关键词： Smoldering Biomass co-pyrolysis Phytoremediation Soil-like substrate Tailing restoration

来源：评论

学校读者我要写书评

暂无评论

Rapid post-earthquake safety assessment of low-rise reinforced concrete structures

引用

Earthquake engineering and engineering Vibration 2025年第1期24卷 101-112页

作者： Koji Tsuchimoto Yasutaka Narazaki Billie F.Spencer,Jr. International Design Division Design DepartmentTaisei CorporationTokyo 163-0606Japan Zhejiang University–University of Illinois Urbana-Champaign Institute Zhejiang UniversityHaining 314400China Civil and Environmental Engineering University of Illinois Urbana-ChampaignUrbana 61821USA

Many countries throughout the world have experienced large earthquakes,which cause building damage or *** such earthquakes,structures must be inspected rapidly to judge whether they are safe to *** facilitate the inspection process,the authors previously developed a rapid building safety assessment system using sparse acceleration measurements for steel framed *** proposed system modeled nonlinearity in the measurement data using a calibrated simplified lumped-mass model and convolutional neural networks(CNNs),based on which the buildinglevel damage index was estimated rapidly after *** proposed system was validated for a nonlinear 3D numerical model of a five-story steel building,and later for a large-scale specimen of an 18-story building in Japan tested on the E-Defense shaking ***,the applicability of the safety assessment system for reinforced concrete(RC)structures with complex hysteretic material nonlinearity has yet to be explored;the previous approach based on a simplified lumpedmass model with a Bouc-Wen hysteretic model does not accurately represent the inherent nonlinear behavior and resulting damage states of RC *** study extends the rapid building safety assessment system to low-rise RC moment resisting frame structures representing typical residential apartments in ***,a safety classification for RC structures based on a damage index consistent with the current state of practice is ***,a 3D nonlinear numerical model of a two-story moment frame structure is created.A simplified lumped-mass nonlinear model is developed and calibrated using the 3D model,incorporating the Takeda degradation model for the RC material *** model is used to simulate the seismic response and associated damage sensitive features(DSF)for random ground *** resulting database of responses is used to train a convolutional neural network(CNN)that performs rapid safety ***

关键词： rapid post-earthquake safety assessment acceleration interstory drift angle damage sensitive feature convolutional neural network RC structure simplified non-linear analysis model Takeda degradation model

来源：评论

学校读者我要写书评

暂无评论

Bioenergy recovery and carbon emissions benefits of short-term bio-thermophilic pretreatment on low organic sewage sludge anaerobic digestion:A pilot-scale study

引用

Journal of environmental Sciences 2025年第2期148卷 321-335页

作者： Hui Wang Xiang Fu Haozhe Huang Danni Shen Dongdong Fan Liming Zhu Xiaohu Dai Bin Dong College of Environmental Science and Engineering Tongji UniversityShanghai 200092China Yangtze Eco-Environment Engineering Research Center China Three Gorges CorporationBeijing 100038China Yangtze River Eco-Environmental Engineering Research Center Shanghai InvestigationDesign and Research Institute Co.LTDShanghai 200092China China Construction Third Engineering Bureau First Engineering Co. Ltd.Wuhan 430000China

Sewage sludge in cities of Yangzi River Belt,China,generally exhibits a lower organic content and higher silt contentdue to leakage of drainage system,which caused low bioenergy recovery and carbon emission benefits in conventional anaerobic digestion(CAD).Therefore,this paper is on a pilot scale,a bio-thermophilic pretreatment anaerobic digestion(BTPAD)for low organic sludge(volatile solids(VS)of 4%)was operated with a long-term continuous flow of 200 *** VS degradation rate and CH_(4) yield of BTPAD increased by 19.93%and 53.33%,respectively,compared to those of *** analysis of organic compositions in sludge revealed that BTPAD mainly improved the hydrolysis of proteins in *** analysis of microbial community proportions by high-throughput sequencing revealed that the short-term bio-thermophilic pretreatment was enriched in Clostridiales,Coprothermobacter and Gelria,was capable of hydrolyzing acidified proteins,and provided more volatile fatty acid(VFA)for the subsequent *** combined with fluorescence quantitative polymerase chain reaction(PCR)analysis showed that the number of bacteria with high methanogenic capacity in BTPAD was much higher than that in CAD during the medium temperature digestion stage,indicating that short-term bio-thermophilic pretreatment could provide better methanogenic conditions for ***,the greenhouse gas emission footprint analysis showed that short-term bio-thermophilic pretreatment could reduce the carbon emission of sludge anaerobic digestion system by 19.18%.

关键词： Sludge Anaerobic digestion Bio-thermophilic pretreatment Pilot scale Molecular microbiology Carbon emissions

来源：评论

学校读者我要写书评

暂无评论

Microplastic transport from a wastewater treatment plant into Qiantang River,an estuarine river

引用

Journal of Oceanology and Limnology 2025年第2期43卷 346-359页

作者： Yuntao ZHANG Huijun LIU Luyi ZHANG Yuan GAO Yong LIU Wenzhou FAN Xiaoying ZHOU Wei HUANG Zhiheng LI Wenlu ZHAO School of Environmental Science and Engineering Zhejiang Gongshang UniversityHangzhou 310018China Zhejiang Institute of Hydraulics&Estuary(Zhejiang Institute of Marine Planning and Design) Hangzhou 310020China Key Laboratory of Marine Ecosystem and Biogeochemistry Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China

Microplastics(MPs)have garnered increasing research attentions due to their ubiquitous presence in the environment and consequential impacts on both ecosystems and human *** treatment plants(WWTPs)are identified as major sources of MPs in aquatic environments,as they receive anthropogenic MPs from household and industrial sewer *** on treated wastewater samples collected in October 2018 from a WWTP in Hangzhou City,China,the MP transport into the Qiantang River before heading into Hangzhou Bay,East China Sea,was *** determine the abundance and characteristics of MPs,the quantities of MPs released into the environment from the WWTP in different treatment stages were estimated,and their migration was simulated using numerical modeling *** show that the abundance of MPs in the effluent of the WWTP was 1.3 pieces/L,with a daily discharge of 7.6×10^(8)pieces of MPs into the Qiantang *** sulfone(PES),rayon,and polyethylene terephthalate(PET)were identified from MPs,being dominated by polypropylene(PP).MPs predominantly displayed fibrous and fragmented *** laundering and plastic product usage were major sources of MPs,with mechanical wear during treatment potentially contributing to the transformation from primary to secondary *** 45 days of transport simulation,a high abundance zone of MPs was observed in the southern region of Hangzhou Bay,with its diffusion range being influenced by the combined effects of river runoff and *** spatial distribution range was significantly greater during the spring tide compared to that in the neap tide,and there were varying degrees of MP accumulation in the upper reaches of the wastewater outlet as runoff *** study integrated the emissions and transport of MPs from WWTPs to estuarine rivers,thereby providing valuable scientific guidance for future regional control measures and ecological risk assessments of MPs.

关键词： microplastic(MP) wastewater treatment plant(WWTP) transport numerical simulation Qiantang River

来源：评论

学校读者我要写书评

暂无评论

Deep-learning-assisted medium optimization improves hyaluronic acid production by Streptococcus zooepidemicus

引用

Journal of Bioscience and Bioengineering 2025年第6期139卷 429-435页

作者： Watanabe, Kazuki Kawai, Yoshizumi Kagenishi, Tomoko Chiou, Tai-Ying Konishi, Masaaki Department of Biotechnology and Environmental Chemistry of Engineering Kitami Institute of Technology 165 Koen-cho Hokkaido Kitami090-8507 Japan Biotechnology and Food Chemistry Course Program School of Regional Innovation and Social Design Engineering Kitami Institute of Technology 165 Koen-cho Hokkaido Kitami090-8507 Japan

To improve the efficiency of hyaluronic acid production by Streptococcus zooepidemicus, the growth medium was optimized with a pipeline involving a deep learning (DL) algorithm. To train the DL model, the initial training dataset (OA01–18) was designed with the L18 orthogonal array, and hyaluronic acid (HA) was produced in small-scale cultures in deepwell plates. The range of HA production was 0.09–1.39 g/L under these conditions. In searching for the optimal medium composition, 54 candidate optimized media (OM01–54) were proposed by the system. According to the confirming culture experiment, the best production of HA (1.66 g/L) was achieved with OM30. During confirmation in a stirred-tank reactor, the volumetric production of HA in OA30 was larger than that in the control medium. In fed batch culture, HA accumulated to 5.13 and 9.96 g/Linitial volume after 10 and 30 h in culture, respectively. To avoid the suppression of HA production by the high viscosity of the medium conferred by HA, repeated batch culture with OM30 was performed by replacing 90 % of the broth volume approximately every 6 h. As a result, 21.4 g of HA was produced in 46 h, and productivity reached 0.465 g/Linitial volume/h. © 2025 The Society for Biotechnology, Japan

关键词： Batch cell culture

来源：评论

学校读者我要写书评

暂无评论

Enhanced microwave dielectric properties of spinel-garnet ceramics based on MgO-Al2O3-Y2O3 ternary systems: A study on solid solutions and composite synergistic strategies

引用

Ceramics International 2025年第13期51卷 18003-18012页

作者： Li, Jian Liu, Jia He, Yeqing Zhang, Xiaohan Jiang, Yanxiang Wang, Yang Sun, Wei Zhou, Yuanyuan Glaubitt, Walther Liu, Futian Wu, Haitao Wang, Fei Li, Ling Shandong Industrial Ceramic Research and Design Institute Co. Ltd Zibo255000 China School of Environmental and Material Engineering Yantai University Yantai264005 China School of Materials Science and Engineering University of Jinan Jinan250022 China Fraunhofer Institute for Silicate Research ISC Neunerplatz 2 Würzburg97082 Germany

High-performance dielectric ceramics are vital for next-generation microwave devices, requiring advanced doping and composite strategies to enhance material properties. The (1-x)MgAl2O4-xY3Al5O12 composite ceramics were found in the MgO-Al2O3-Y2O3 pseudoternary phase diagram and synthesized via solid-phase reaction. The two phases coexist to improve grain size distribution and achieve a low eutectic temperature, allowing x = 0.1–0.7 samples to gain a dense microstructure (ρ > 96 %) when sintered at 1650–1670 °C. The semi-coherent interface, coupled with the Mg2+/Y3+ cation transition zone, promotes the formation of a partial solid solution, thereby alleviating interfacial stress at the grain boundaries between MgAl2O4 and Y3Al5O12. Notably, the 0.3MgAl2O4-0.7Y3Al5O12 ceramic exhibits satisfying microwave dielectric properties: Εr = 10.1 ± 0.24, Q × f = 195,000 ± 12,000 GHz, and τf = −11.9 ppm/°C. In addition to phase composition and microstructure, the enhanced performance can be attributed to the optimized crystal structure. The partial substitution of Y3+ by Mg2+ with a smaller radius induced the "rattling" effect and abnormal large permittivity in the [YO8] site. The 27Al NMR spectra revealed an increase in the Mg-Al inversion degree in the Mg-deficient spinel structure, resulting in the elevated total covalency of the Al-O bond. The structural changes corresponded to a decrease in intrinsic dielectric loss in Mg-Al spinel and an increase in τf in the Y-Al garnet phase. These findings indicate the (1-x)MgAl2O4-xY3Al5O12 ceramics have promising applications in the field of HTCC millimeter wave communications. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Dielectric losses

来源：评论

学校读者我要写书评

暂无评论

Hydrogeochemical signatures, quality and driving forces of phreatic groundwater in a typical headwater region of the Yellow River watershed

引用

Applied Water Science 2025年第5期15卷 1-16页

作者： Liu, Kui Yan, Huijun Wang, Wanping Wang, Shengbin Wang, Zhigang Xiao, Yong Guo, Bo Wang, Jie Zhang, Shilong Zhang, Guoqiang Yang, Shaokang Liu, Yu Kunming Engineering Corporation Limited Power China Kunming650051 China Faculty of Geosciences and Engineering Southwest Jiaotong University Chengdu611756 China Qinghai Institute of Geological Environment Monitoring Xining810008 China Qinghai Provincial Land Remediation and Ecological Restoration Center Xining810008 China Key Lab of Environmental Geology of Qinghai Province Xining810001 China Bureau of Qinghai Environmental Geological Prospecting Xining810001 China Qinghai 906 Engineering Survey and Design Institute Co. Ltd Xining810007 China Qinghai Engineering Research Center of Geoenvironment Protection and Geohazard Prevention Xining810007 China Xiamen Institute of Environmental Science Xiamen361006 China

Groundwater chemistry is essential for water supply to both human community and ecosystems. This study focuses on a typical headwater region of the Yellow River watershed, aiming to get insights into the hydrogeochemical characteristics and governing factors of phreatic groundwater in the large river watershed. Phreatic groundwater exhibits slightly alkaline properties in this alpine headwater region. The majority of the sampled groundwater is relatively fresh. Groundwater hydrochemical facies are predominantly of Ca–HCO3 type, gradually evolving to Mg·Ca–Cl type, and then to Na–Cl along the groundwater flow path. Groundwater hydrochemical composition is primarily governed by sulfates dissolution, silicates weathering, and cation exchange reactions in natural processes. Agricultural practices and municipal sewage contribute nitrogen and chemical constituents into phreatic aquifers, resulting in increased salinity and the progressive deterioration of phreatic groundwater quality. Approximately 25% of sampling groundwater exceeded the recommended limit for NO3−, and around 20% surpassed the limit for F−. These exceedances could potentially pose health risks to the population due to oral exposure. Groundwater exhibits significant variation in hydrochemical quality, with EWQI values ranging from 26 to 185. The majority (75%) of sampled groundwaters have the EWQI values less than 100, and are suitable for direct human consumption. Considering the rising population density in the alpine headwater region of large river watershed worldwide, the ongoing monitoring of groundwater supplies is essential to detect any potential toxic substances that may arise from human activities. © The Author(s) 2025.

关键词： Hydrochemistry

来源：评论

学校读者我要写书评

暂无评论

Stable partial nitrification was achieved for nitrogen removal from municipal wastewater by gel immobilization:A pilot-scale study

引用

Journal of environmental Sciences 2025年第5期151卷 529-539页

作者： Xin Hu Hong Yang Xiaoyue Fang Xuyan Liu Jiawei Wang Xiaotong Wang Yongsheng Bai Bojun Su Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering Faculty of ArchitectureCivil and Transportation EngineeringBeijing University of TechnologyBeijing 100124China Beijing General Municipal Engineering Design&Research Institute Co. Ltd.Beijing 100044China Hebei GEO University Shijiazhuang 050031China Hebei Key Laboratory of Water Quality Engineering and Comprehensive Utilization of Water Resources Hebei University of ArchitectureZhangjiakou 075000China School of Environmental Science and Safety Engineering Tianjin University of TechnologyTianjin 300384China Beijing Drainage Group Co.Ltd. Beijing 100022China

As an energy and carbon saving process for nitrogen removal from wastewater,the partial nitrification and denitrification process(PN/D)has been extensively ***,achieving stable PNinmunicipalwastewater has always been *** this study,a gel immobilized PN/D nitrogen removal process(GI-PN/D)was established.A 94 days pilot-scale experiment was conducted using real municipal wastewater with an ammonia concentration of 43.5±5.3mg N/L at a temperature range of 11.3–28.7◦*** nitrogen removal performance and associated pathways,shifts in the microbial community as well as sludge yield were *** results were as follows:the effluent TN and COD were 0.6±0.4mg/L and 31.1±3.8 mg/L respectively,and the NAR exceeding 95%.GI-PN/D achieved deep nitrogen removal ofmunicipalwastewater through stable PN without taking any *** primary pathways for nitrogen removal were identified as denitrification,simultaneous nitrification-denitrification,and aerobic ***-throughput sequencing analysis revealed that the immobilized fillers facilitated the autonomous enrichment of functional bacteria in each reactor,effectively promoting the dominance and stability of the microbial *** addition,GI-PN/D had the characteristic of low sludge yield,with an average sludge yield of 0.029 kg SS/kg *** study provides an effective technical for nitrogen removal from municipal wastewater through PN.

关键词： Gel immobilization Partial nitrification Deep nitrogen removal Autonomous enrichment Sludge yield

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：