检索结果-南通市图书馆

Fast clogging problem of open check dams and a new type suggestion:curved footed type open check dam

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Mountain Science 2023年第5期20卷 1201-1219页

作者： ANILAN Tugce AKCALI emre Karadeniz Technical University Department of Civil EngineeringTrabzon 61080Turkiye State Hydraulic Works 6th Regional DirectorateAdana 01120Turkiye

Driftwood is one of the important physical components in mountainous rivers which causes severe hazards due to the clogging of bridges,culverts,and narrow sections during ***,the understanding of driftwood dynamics and mitigation measures are crucial for managing wood in *** check dams are the most commonly used engineering measure for preventing driftwood from reaching downstream ***,these open check dams frequently lose their sediment transport function when they are blocked by sediment and driftwood,especially during major flood *** paper proposes a new type of open check dam for preventing from ***,flume experiments were conducted to examine the influence of different types of open check dams on the characteristics of driftwood *** the model with wood length(LWD)=16.5 cm,wood diameter(D)=15 mm,and wood number(N)=172,the highest trapping efficiency was observed with 90.1%and 87.2%retention rates for the classical debris flow breaker and curved footed open check dams,*** tests showed that through this proposed design,woody debris blockage in a very short time was prevented from the accumulation of woods beside the *** addition to this,most of the sediment passed through the check dam and most of the driftwood got *** can be briefly stated that the geometrical design of the structure plays an important role and can be chosen carefully to optimize trapping *** designing this type of open check dams in mountain river basins,it may provide a better understanding of the driftwood accumulation and basis for the optimal design of these *** development of the solution proposed in this work can pave the way for designing different types of open check dams for effective flood management.

关键词： Debris flow Open check dam Driftwood Trapping efficiency Sediment transport Flood management Riverflow

Use of centrifugal-gravity concentration for rejection of talc and recovery improvement in base-metal flotation

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2016年第8期23卷 859-867页

作者： Bern Klein Naci emre Altun Hassan Ghaffari NBK Institute of Mining Engineering The University of British Columbia Department of Mining Engineering Middle East Technical University Tetra Tech Metallurgy

The possibility of using a centrifugal-gravity concentrator to reject Mg-bearing minerals and minimize metal losses in the flotation of base metals was evaluated. Sample characterization, batch scoping tests, pilot-scale tests, and regrind-flotation tests were conducted on a Ni flotation tailings stream. Batch tests revealed that the Mg grade decreased dramatically in the concentrate products. Pilot-scale testing of a continuous centrifugal concentrator（Knelson CVD6） on the flotation tailings revealed that a concentrate with a low mass yield, low Mg content, and high Ni upgrade ratio could be achieved. Under optimum conditions, a concentrate at 6.7% mass yield was obtained with 0.85% Ni grade at 12.9% Ni recovery and with a low Mg distribution（1.7%）. Size partition curves demonstrated that the CVD also operated as a size classifier, enhancing the rejection of talc fines. Overall, the CVD was capable of rejecting Mg-bearing minerals. Moreover, an opportunity exists for the novel use of centrifugal-gravity concentration for scavenging flotation tailings and/or after comminution to minimize amount of Mg-bearing minerals reporting to flotation.

关键词： flotation base metals talc centrifugation gravity concentrators

Modeling, analysis, and screening of cyclic pressure pulsing with nitrogen in hydraulically fractured wells

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2016年第3期13卷 532-549页

作者： emre Artun Ali Aghazadeh Khoei Kutay Kose Petroleum and Natural Gas Engineering Program Middle East Technical University Northern Cyprus Campus Kalkanli Guzelyurt 99738 Mersin 10 Turkey University of Tulsa Tulsa Oklahoma USA

Cyclic pressure pulsing with nitrogen is studied for hydraulically fractured wells in depleted reservoirs.A compositional simulation model is constructed to represent the hydraulic fractures through local-grid *** process is analyzed from both operational and reservoir/hydraulic-fracture *** sensitivity parameters for the operational component are chosen as the injection rate,lengths of injection and soaking periods and the economic rate limit to shut-in the *** the reservoir/hydraulic fracturing components,reservoir permeability,hydraulic fracture permeability,effective thickness and half-length are *** parameters are varied at five levels.A full-factorial experimental design is utilized to run 1250 *** study shows that within the ranges studied,the gas-injection process is applied successfully for a 20-year project period with net present values based on the incremental recoveries greater than *** is observed that the cycle rate limit,injection and soaking periods must be optimized to maximize the *** simulation results are used to develop a neural network based proxy model that can be used as a screening tool for the *** proxy model is validated with blind-cases with a correlation coefficient of 0.96.

关键词： Cyclic pressure pulsing Nitrogen injection Hydraulically-fractured wells Experimental design Artificial neural networks

Spatial estimation of wind speed:a new integrative model using inverse distance weighting and power law

在线全文

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2016年第8期9卷 733-747页

作者： emre Ozelkan Gang Chen Burak Berk Ustundag Agricultural&Environmental Informatics Research and Application Centre Istanbul Technical UniversityIstanbulTurkey Department of Geography and Earth Sciences University of North Carolina at CharlotteCharlotteNCUSA Laboratory for Remote Sensing and Environmental Change(LRSEC) University of North Carolina at CharlotteCharlotteNCUSA

Spatial interpolation(SI)is currently one of the most common ways to estimate wind speed(Ws).However,classic SI models either ignore the complex geography[*** distance weighting(IDW)],or demand high computational resources(***).This study aimed to develop a simple yet effective SI model for estimating Ws in Eastern Thrace of *** new method,named MIDW(Ws),is a modified IDW through the integration of IDW with wind profile model,power law(PL),representing the influence of land cover and topography on *** features and elevation data of PL were obtained using normalized difference vegetation index(NDVI)and digital elevation model(DEM),*** showed superior and comparable performance of MIDW(Ws)to standard IDW and ordinary kriging(OK)across all months of *** to ordinary cokriging(OCK)using DEM as covariate,MIDW(Ws)generated better results in the arid–semiarid seasons(around summer).Local complex atmospheric conditions during rainy seasons(around winter)may have affected the performance of incorporating PL with MIDW(Ws).Generally,the proposed MIDW(Ws)is simpler and easier to implement compared to *** landscape-scale projects,its high computational efficiency and relatively robust performance show potential to deal with large volumes of datasets.

关键词： Wind speed power law NDVI spatial interpolation modified inverse distance weighting

Automated integration of real-time and non-real-time defense systems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2021年第2期17卷 657-670页

作者： emre Dalkıran Tolga Onel Okan Topçu Kadir Alpaslan Demir Barbaros Naval Science and Engineering Institute Turkish Naval AcademyNational Defense UniversityTuzlaIstanbul34942Turkey Department of Computer Engineering Turkish Naval AcademyNational Defense UniversityTuzlaIstanbul34942Turkey Department of Computer Engineering Middle East Technical University Northern Cyprus CampusKalkanliGuzelyurtMersin 1099738Turkey Institute of Social Sciences Gebze Technical UniversityGebzeKocaeli41400Turkey

Various application domains require the integration of distributed real-time or near-real-time systems with non-real-time *** cities,smart homes,ambient intelligent systems,or network-centric defense systems are among these application *** Distribution Service(DDS)is a communication mechanism based on Data-Centric Publish-Subscribe(DCPS)*** is used for distributed systems with real-time operational *** Message Service(JMS)is a messaging standard for enterprise systems using Service Oriented Architecture(SOA)for non-real-time *** allows Java programs to exchange messages in a loosely coupled *** also supports sending and receiving messages using a messaging queue and a publish-subscribe *** this article,we propose an architecture enabling the automated integration of distributed real-time and non-real-time *** test our proposed architecture using a distributed Command,Control,Communications,Computers,and Intelligence(C4I)*** system has DDS-based real-time Combat Management System components deployed to naval warships,and SOA-based non-real-time Command and Control components used at *** proposed solution enables the exchange of data between these two systems *** compare the proposed solution with a similar *** solution is superior in terms of automation support,ease of implementation,scalability,and performance.

关键词： Systems integration System of systems Systems engineering Software engineering C4I systems Defense systems Data distribution service DDS integration Java message service JMS

Colorectal cancer: The epigenetic role of microbiome

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2019年第22期7卷 3683-3697页

作者： Hussein Sabit emre Cevik Huseyin Tombuloglu Department of Genetics Institute for Medical Research and Consultations Imam Abdulrahman Bin Faisal University

Colorectal cancer(CRC)is the third most common cancer in men(746000 cases per year)and the second most common cancer in women globally(614000 cases per year).The incidence rate of CRC in developed countries(737000 cases per year)is higher than that in less developed countries(624000 cases per year).CRC can arise from genetic causes such as chromosomal instability and microsatellite *** etiologic factors underlie CRC including age,diet,and *** microbiota represent a proven cause of the disease,where they play pivotal roles in modulating and reshaping the host *** active microbial metabolites have been found to drive carcinogenesis,invasion,and metastasis via modifying both the methylation landscape along with histone structure in intestinal *** microbiota,in response to diet,can exert both beneficial and harmful functions in humans,according to the intestinal balance of number and types of these *** the intestinal microbial community is diverse among individuals,these microbes cumulatively produce 100-fold more proteins than the human genome itself,which calls for further studies to elaborate on the complicated interaction between these microorganisms and intestinal ***,understanding the exact role that gut microbiota play in inducing CRC will help attain reliable strategies to precisely diagnose and treat this fatal disease.

关键词： Colorectal Cancer Colorectal cancer Epigenetics Gut Microbiota

Development of an Amperometric Hydrogen Peroxide Biosensor based on the Immobilization of Horseradish Peroxidase onto Nickel Ferrite Nanoparticle-Chitosan Composite

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2011年第2期3卷 91-98页

作者： Furkan Yalcner emre Cevik Mehmet Senel Abdulhadi Baykal Department of Chemistry Faculty of Arts and SciencesFatih University

Nickel ferrite(NiFe_2O_4) nanoparticles have been dispersed in chitosan solution in order to fab ricate nanocomposite *** peroxidase(HRP) has been immobilized onto this chitosan NiFe_2O_4 nanocomposite film via physical *** size of the NiFe_2O_4 nanoparticles has been estimated us ing X ray diffraction pattern and scanning electron microscopy(SEM) to be 40±9 *** chitosan NiFe_2O_4 nanocomposite film and HRP/chitosan NiFe_2O_4 bioelectrode have been characterized using SEM *** HRP/chitosan NiFe_2O_4 nanocomposite bioelectrode has a response time of 4 s,linearity as 0.3 to 12 m M of H2O2,sensitivity as 22 n A/m *** effects of p H and the temperature of the immobilized HRP electrode have also been studied.

关键词： Biosensor NiFe_2O_4 Horseradish peroxidase Nanoparticle Chitosan

Evolution of Microstructure, Residual Stress, and Tensile Properties of Mg–Zn–Y–La–Zr Magnesium Alloy Processed by Extrusion

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2019年第11期32卷 1309-1319页

作者： Huseyin Zengin Yunus Turen Muhammet emre Turan Fatih Ayd?n Department of Metallurgical and Materials Engineering Karabuk University Baliklarkayasi Mevkii Demir Celik Kampusu

The microstructure, texture, residual stress, and tensile properties of Mg–6 Zn–2 Y–1 La–0.5 Zr(wt%) magnesium alloy were investigated before and after extrusion process, which performed at 300 °C and 400 °C. The microstructural characterizations indicated that the as-cast alloy was comprised of α-Mg, Mg–Zn, Mg–Zn–La, and Mg–Zn–Y phases. During homogenization at 400 °C for 24 h, most of the secondary phases exhibited partial dissolution. Extrusion process led to a remarkable grain refi nement due to dynamic recrystallization(DRX). The degree of DRX and the DRXed grain size increased with increasing extrusion temperature. The homogenized alloy did not show a preferential crystallographic orientation, whereas the extruded alloys showed strong basal texture. The extrusion process led to a signifi cant improvement on the compressive residual stress and mechanical properties. The alloy extruded at 300 °C exhibited the highest basal texture intensity, the compressive residual stress and hardness, and yield and tensile strengths among the studied alloys.

关键词： ZK60 Magnesium alloy Residual stress Texture Mechanical properties Extrusion

Inhomogeneous Quantum Invariance Group of Multi-Dimensional Multi-parameter Deformed Boson Algebra

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第1期29卷 8-10页

作者： Azmi Ali Altintas Metin Arik Ali Serdar Arikan emre Dil Faculty of Engineering Okan UniversityTuzlaIstanbulTurkey Department of Physics Boğazici UniversityBebekIstanbulTurkey Department of Physics Sakarya UniversityEsentepeSakaryaTurkey

We investigate the inhomogeneous invariance quantum group of the d-dimensional d-parameter deformed boson *** is found that the homogeneous part of this quantum group is given by the𝑑-parameter deformed general linear *** construct the d-matrix which collects all information about the non-commuting structure of the quantum group for the two-dimensional case.

关键词： group. algebra. parameter