检索结果-南通市图书馆

Dynamic stress concentration in an infinitely long cylindrical cavity due to a point spherical source embedded within a fluid-saturated poroelastic formation of infinite extent

引用

Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 139-156页

作者： H.HOSSEINI O.BALILASHAKI Department of Mechanical engineering Faculty of EngineeringGolestan University

The effects of a harmonically exciting monopole source on an infinitely long cylindrical cavity embedded entirely within a fluid-saturated poroelastic formation of infinite extent are examined theoretically. It is assumed that the source is located outside the cavity at a specified distance from the borehole axis. The magnitudes of the hoop and radial stresses beside the pore pressures exerted on the interface and inside the porous medium surrounding the borehole are calculated and discussed. Biot's poroelastic modeling along with three types of boundary conditions for the cylindrical interface including the ideal fluid, empty borehole, and rigid inclusion with a hard boundary is employed for the analysis. Utilizing a proper translational addition theorem for expressing the incident spherical wave in terms of cylindrical wave expansions, the proposed boundary conditions at the interface are satisfied. Stresses are formulated by means of wave potential functions in a three-dimensional(3D) manner. The effects of the frequency and the radial distance between the source and borehole on the induced stresses are examined for the first cylindrical modes over frequency spectra. Two permeability conditions for the interface and three types of soils for the porous formation are considered throughout the analysis. To give an overall outline of the study, a numerical example is presented. The results clearly indicate that the distance is a key parameter and has considerable effects on the induced stress values. In addition, the interface permeability condition and soil characteristics play an important role in determining the dynamic response of the borehole. Finally,the obtained results are compared with the relevant analyses existing in the literature for some limit cases, and good agreement is achieved.

关键词： cylindrical cavity O353.4 point source porous medium stress concentration wave-field transformation

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Abrasive wear behavior of functionally graded Al_(3)Ti reinforced aluminum matrix composite

引用

China Foundry 2025年第1期22卷 45-54页

作者： Eylül Tuğçe Yaman Yildiz Ömer Savaş Muhammed Soner Başer Engin Kocaman Ince Shipping Group 34724IstanbulTurkey Yildiz Technical University Faculty of Naval Architecture and Maritime34349IstanbulTurkey Ministry of Transport and Infrastructure General Directorate of Marine Affairs06338AnkaraTurkey Zonguldak Bulent Ecevit University Faculty of EngineeringDepartment of Aerospace Engineering67100ZonguldakTurkey

Aluminum alloys are widely used in industry due to their light *** alloys are generally exposed to abrasive wear,which diminishes their effective *** wear resistance of these alloys is enhanced by adding various reinforcements,however,this enhancement comes at the cost of reduced fracture *** paradox of increased wear resistance versus decreased fracture toughness in aluminum alloys can be resolved by using functionally graded materials (FGMs).This study focuses on the abrasive wear behavior of functional graded aluminum matrix composites reinforced with Al_(3)Ti *** wear properties of the composites were investigated by considering the characteristics of the composite such as matrix type and various composite zones,as well as the wear parameters such as abrasive particle diameter,load,sliding speed and *** method was used in the abrasive wear tests in order to get more reliable results in a timeefficient *** recipes were created based on the L_(27)(3^(6)) orthogonal *** a result of the study,it is observed that the wear resistance of the composites increases with an increase in Al_(3)Ti reinforcement content and hardness of the *** addition,the size of abrasive particles and the applied load are significant factors affecting abrasive wear.

关键词： functionally graded Al_(3)Ti Taguchi abrasive wear

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Dynamic Multi-Graph Spatio-Temporal Graph Traffic Flow Prediction in Bangkok:An Application of a Continuous Convolutional Neural Network

引用

Computer Modeling in engineering & Sciences 2025年第1期142卷 579-607页

作者： Pongsakon Promsawat Weerapan Sae-dan Marisa Kaewsuwan Weerawat Sudsutad Aphirak Aphithana Department of Civil engineering Faculty of EngineeringRamkhamkaeng UniversityBangkok10240Thailand Department of Computer engineering Faculty of EngineeringRamkhamkaeng UniversityBangkok10240Thailand Department of Statistics Faculty of ScienceRamkhamkaeng UniversityBangkok10240Thailand

The ability to accurately predict urban traffic flows is crucial for optimising city ***,various methods for forecasting urban traffic have been developed,focusing on analysing historical data to understand complex mobility *** learning techniques,such as graph neural networks(GNNs),are popular for their ability to capture spatio-temporal ***,these models often become overly complex due to the large number of hyper-parameters *** this study,we introduce Dynamic Multi-Graph Spatial-Temporal Graph Neural Ordinary Differential Equation Networks(DMST-GNODE),a framework based on ordinary differential equations(ODEs)that autonomously discovers effective spatial-temporal graph neural network(STGNN)architectures for traffic prediction *** comparative analysis of DMST-GNODE and baseline models indicates that DMST-GNODE model demonstrates superior performance across multiple datasets,consistently achieving the lowest Root Mean Square Error(RMSE)and Mean Absolute Error(MAE)values,alongside the highest *** the BKK(Bangkok)dataset,it outperformed other models with an RMSE of 3.3165 and an accuracy of 0.9367 for a 20-min interval,maintaining this trend across 40 and 60 ***,on the PeMS08 dataset,DMST-GNODE achieved the best performance with an RMSE of 19.4863 and an accuracy of 0.9377 at 20 min,demonstrating its effectiveness over longer *** Los_Loop dataset results further emphasise this model’s advantage,with an RMSE of 3.3422 and an accuracy of 0.7643 at 20 min,consistently maintaining superiority across all time *** numerical highlights indicate that DMST-GNODE not only outperforms baseline models but also achieves higher accuracy and lower errors across different time intervals and datasets.

关键词： Graph neural networks convolutional neural network deep learning dynamic multi-graph spatio-temporal

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Morphologically controlled synthesis of MgFe-LDH using MgO and succinic acid for enhanced arsenic adsorption:Kinetics,equilibrium,and mechanism studies

引用

Journal of Environmental Sciences 2025年第2期148卷 637-649页

作者： Yusuf Olalekan Zubair Shigeshi Fuchida Keishi Oyama Chiharu Tokoro Graduate school of Creative Science and engineering Waseda UniversityOkubo 3-4-1ShinjukuTokyo169-8555Japan Department of marine Resources and Energy Tokyo University of Marine Science and Technology4-5-7 KonanMinato-KuTokyo 108-8477Japan faculty of Science and engineering Waseda University3-4-1 OkuboShinjuku-kuTokyo 169-8555Japan faculty of engineering The University of Tokyo7-3-1 HongoBunkyo-KuTokyo 113-8656Japan

In this study,we investigated improving the performance of a layered double hydroxide(LDH)for the adsorption of As(III)and As(V)by controlling the morphology of LDH *** LDH was synthesized via a simple coprecipitation method using barely soluble MgO as a precursor and succinic acid(SA)as a morphological control *** the LDH crystals with carboxylate ions(RCOO−)derived from SA caused the crystals to develop in a radial *** changed the pore characteristics and increased the density of active surface ***,SA/MgFe-LDH showed excellent affinity for As(III)and As(V)with maximum sorption densities of 2.42 and 1.60 mmol/g,*** comparison,the pristine MgFe-LDH had sorption capacities of 1.56 and 1.31 mmol/g for As(III)and As(V),*** LDH was effective over a wide pH range for As(III)adsorption(pH 3-8.5)and As(V)adsorption(pH 3-6.5).Using a combination of spectroscopy and sorption modeling calculations,the main sorption mechanism of As(III)and As(V)on SA/MgFe-LDH was identified as inner-sphere complexation via ligand exchangewith hydroxyl group(-OH)and RCOO−.Specifically,bidentate As-Fe complexeswere proposed for both As(III)and As(V)uptake,with the magnitude of formation varying with the initial As ***,the As-laden adsorbent had satisfactory stability in simulated real landfill *** findings demonstrate that SA/MgFe-LDH exhibits considerable potential for remediation of As-contaminated water.

关键词： Arsenic Heavy magnesium oxide Succinic acid Layered double hydroxide Adsorption Bidentate complex Stabilization

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Electrodeposited binder-free oxy-hydroxide nanostructures as promising electrocatalyst for hydrogen and oxygen evolution reactions

引用

Nano Research 2025年第2期18卷 11-63页

作者： Danial Iravani Ghasem Barati Darband Chemical engineering Department Faculty of EngineeringFerdowsi University of Mashhad(FUM)*** MashhadIran Materials and Metallurgical engineering Department Faculty of EngineeringFerdowsi University of Mashhad(FUM)*** MashhadIran

In recent years,extensiveresearch and development have been conducted on renewable energies to overcome the problems caused by fossil fuel *** the meantime,the production of hydrogen energy through electrochemical water spltting(EWS)has been limited by various challenges,such as high required ***,other methods of hydrogen production may lead to environmental problems,such as greenhouse gas *** electrocatalysts can significantly mitigate the EWS ***-hydroxide compoundspossess unique properties that make them effective electrocatalysts for the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).Additionally,the utilizationof the electrodeposition method,a binder-free technique,enables the production of electrodes exhibiting favorable electrocatalytic activity and *** review article provides an overview of the challenges associated with the EWS technique,highlighting the importance of transition metal oxy-hydroxide electrodes in facilitating the HER and OER ***,the paper evaluates the effectiveness of fabricated transition metal oxy-hydroxide electrodes through electrodeposition and suggests potential areas for future research on Ews.

关键词： electrochemical water splitting hydrogen evolution reaction oxygen evolution reaction electrodeposition oxy-hydroxides

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tremendously enhanced catalytic performance of Fe(Ⅲ)/peroxymonosulfate process by trace Cu(Ⅱ):A high-valent metals domination in organics removal

引用

Journal of Environmental Sciences 2025年第1期147卷 487-497页

作者： Jieli Ou Yiqing Liu Linyue Zhang Zhenran Wang Yuqi Tang Yongsheng Fu Dandan Zhao faculty of Geosciences and Environmental engineering Southwest Jiaotong UniversityChengdu 611756China

Dissolved copper and iron ions are regarded as friendly and economic catalysts for peroxymonosulfate(PMS)activation,however,neither Cu(Ⅱ)nor Fe(Ⅲ)shows efficient catalytic performance because of the slow rates of Cu(Ⅱ)/Cu(Ⅰ)and Fe(Ⅲ)/Fe(Ⅱ)***,we observed a significant enhancement on the degradation of organic contaminants when Cu(Ⅱ)and Fe(Ⅲ)were coupled to activate PMS in borate(BA)*** degradation efficiency of Rhodamine B(RhB,20μmol/L)reached up to 96.3%within 10 min,which was higher than the sum of individual Cu(Ⅱ)-and Fe(Ⅲ)-activated PMS *** radical,hydroxyl radical and high-valent metal ions(i.e.,Cu(Ⅲ)and Fe(IV))were identified as the working reactive species for RhB removal in Cu(Ⅱ)/Fe(Ⅲ)/PMS/BA system,while the last played a predominated *** presence of BA dramatically facilitated the reduction of Cu(Ⅱ)to Cu(Ⅰ)via chelating with Cu(Ⅱ)followed by Fe(Ⅲ)reduction by Cu(Ⅰ),resulting in enhanced PMS activation by Cu(Ⅰ)and Fe(Ⅱ)as well as accelerated generation of reactive ***,the strong buffering capacity of BA to stabilize the solution pH was satisfying for the pollutants degradation since a slightly alkaline environment favored the PMS activation by coupling Cu(Ⅱ)and Fe(Ⅲ).In a word,this work provides a brand-new insight into the outstanding PMS activation by homogeneous bimetals and an expanded application of iron-based advanced oxidation processes in alkaline conditions.

关键词： Peroxymonosulfate Bimetallic catalyst Borate High-valent metals Complexation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Reduction of losses in electric power distribution system-dynamic reconfiguration case study

引用

Control Theory and Technology 2025年第1期23卷 49-63页

作者： Branimir Novoselnik Drago Bago Jadranko Matuško Mato Baotić faculty of Electrical engineering and Computing University of ZagrebUnska 3Zagreb10000Croatia faculty of Mechanical engineering Computing and Electrical EngineeringUniversity of MostarMatice Hrvatske bbMostar88000Bosnia and Herzegovina

This paper deals with reduction of losses in electric power distribution system through a dynamic reconfiguration case study of a grid in the city of Mostar,Bosnia and *** proposed solution is based on a nonlinear model predictive control algorithm which determines the optimal switching operations of the distribution *** goal of the control algorithm is to find the optimal radial network topology which minimizes cumulative active power losses and maximizes voltages across the network while simultaneously satisfying all system *** optimization results are validated through multiple simulations(using real power demand data collected for a few characteristic days during winter and summer)which demonstrate the efficiency and usefulness of the developed control algorithm in reducing the grid losses by up to 14%.

关键词： Nonlinear model predictive control Dynamic reconfiguration Power distribution system Mixed-integer programming Real-life case study

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Optimizing distribution of multiple tuned mass dampers for building structures with inverse element exchange method

引用

Earthquake engineering and engineering Vibration 2025年第1期24卷 187-199页

作者： Peng-Tai Chan Department of marine Environment and engineering Sun Yat-sen University(NSYSU)Kaohsiung 804TaiwanChina

Multiple tuned mass dampers(MTMDs)reduce dynamic response with multiple specified frequencies of building *** optimization algorithms for placement design exist,though they rarely conform to code-based verification nor produce high quality solutions without high computational effort and high *** study proposes an inverse element exchange method(IEEM)with multi-level programming and compares it to a single tuned mass damper(STMD)and uniform distribution of multiple tuned mass dampers in the frequency and time domains.A ten-story shear building is used for the numerical case *** results show that the proposed method can offer improvement over the STMD,uniform distribution of multiple tuned mass dampers,and distribution optimized by genetic algorithms(GA)with regard to minimizing the interstory drift ratio(IDR)in both the frequency and time domains and the time consumption for optimization.

关键词： tuned mass damper multiple tuned mass damper optimal damper placement design transfer function

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Adsorption Characteristics of Congo Red Dye onto Calcinated Mytilus edulis Shell Powders

引用

Journal of Ocean University of China 2025年第1期24卷 229-237页

作者： WANG Xin GE Xiangyun ZHU Siqi LIU Weixiang XING Ronge LI Pengcheng LI Kecheng marine Science and engineering College Qingdao Agricultural UniversityQingdao 266109China Key Laboratory of Experimental marine Biology Center for Ocean Mega-ScienceInstitute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for marine Drugs and Bioproducts Qingdao Marine Science and Technology CenterQingdao 266237China

Dye wastewater poses a significant threat to aquatic organisms due to its high *** or eliminating the dye waste from the water is necessary for a healthy and sustainable *** study investigated the adsorption properties of Congo red dye on Mytilus edulis shell powders prepared by calcination at 500℃,700℃,and 900℃.The modified shell powder products were analyzed by SEM(scanning eletron microscopy)and FTIR(fourier transform infrared spectroscopy)for the morphology and structural *** effects of different calcination temperatures,reaction times,reaction temperatures,and initial concentration of Congo red on the adsorption properties were *** adsorption kinetics and isothermal adsorption models were also *** results revealed that the shell powder calcinated at 900℃showed the best adsorption capacity on Congo red from aqueous *** adsorption reaction reached equilibrium after 150 min and followed by the pseudo-second-order kinetic *** 25℃,96.2%of the Congo red in the solution could be removed,and the adsorption capacity could reach at least 1015 mg g^(–1).The adsorption isotherm is fit with the Freundlich model,indicating a multiphase adsorption *** results are helpful for cleaning and treating printing and dyeing effluents as well as high-value utilization of shell waste resources.

关键词： adsorption Congo red high-temperature calcination Mytilus edulis shell

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

17α-methyltestosterone induced hepatocyte apoptosis through endoplasmic reticulum stress in Takifugu fasciatus

引用

Journal of Oceanology and Limnology 2025年第1期43卷 219-231页

作者： Xuanyin CHEN Sheng LUO Yanfang LI Rui LI Xiaojun LI Zhengyang HU Shaowu YIN Tao WANG College of marine Science and engineering Jiangsu Province Engineering Research Center for Aquatic Animals Breeding and Green Efficient Aquacultural TechnologyNanjing Normal UniversityNanjing 210023China Co-Innovation Center for marine Bio-Industry Technology of Jiangsu Province Lianyungang 222005China

17α-methyltestosterone(17α-MT)is an emerging pollutant,which is harmful to the endocrine system and reproduction of *** investigated the effects of different concentrations of 17α-MT(0,5,30,60,and 100 mg/kg)on endoplasmic reticulum stress(ERS)and apoptosis in the liver of Takifugu *** show that:(1)with the increase of 17α-MT treatment concentration,liver transaminases(alanine aminotransferase;aspartate aminotransferase)and the mRNA expression of ERS marker genes(glucose-regulated protein 78;calreticulin)of *** were significantly increased compared with the control group(P<0.05);(2)the activity of succinate dehydrogenase(SDH),Caspase3 and Caspase9 in the liver of *** increased with the increase of 17α-MT concentration compared with the control group(P<0.05);(3)by using 4-phenylbutyricacid(4-PBA)inhibitors to stimulate ERS through in vitro experiments,the expression of ERS and apoptosis-related genes significantly decreased(P<0.05),and the apoptosis rate of *** hepatocytes was significantly inhibited(P<0.05)under 17α-MT *** study confirmed that ERS played an important role in the induction of apoptosis in the hepatocytes of ***,which enriched the ecotoxicological information of environmental androgens.

关键词： 17α-methyltestosterone Takifugu fasciatus liver endoplasmic reticulum stress apoptosis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

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

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：