检索结果-南通市图书馆

NOTES ON THE SPECTRAL PROPERTIES OF THE WEIGHTED MEAN DIFFERENCE OPERATOR G(u,v;?) OVER THE SEQUENCE SPACE ?_1

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2016年第2期36卷 477-486页

作者： Vatan KARAKAYA ezgi erdogan Department of Mathematical Engineering Yzldiz Technical UniversityDavutpasaIstanbulTurkey Department of Mathematics Marmara UniversityKadikoyIstanbulTurkey

In the study by Baliarsingh and Dutta [Internat. ***., Vol.2014（2014）, Article ID 786437], the authors computed the spectrum and the fine spectrum of the product operator G （u, v; A） over the sequence space e1. The product operator G （u, v; △） over l1 is defined by （G（u,v;△）x）k=^k∑i=0ukvi（xi- xi-1） with xk = 0 for all k 〈 0, where x = （xk）∈e1,and u and v axe either constant or strictly decreasing sequences of positive real numbers satisfying certain conditions. In this article we give some improvements of the computation of the spectrum of the operator G （u, v; △） on the sequence space gl.

关键词： Spectrum of an operator weighted mean difference operator sequence space

A methodology for lining design of circular mine shafts in different rock masses

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2016年第5期26卷 761-768页

作者： Ozturk Hasan Guler erdogan Mining Engineering Department Middle East Technical University

In this study, the finite element numerical modelling of 2D shaft sections in a Hoek–Brown medium are carried out in a non-hydrostatic stress state in an attempt to predict pressures developing around mine shafts. An iterative process of applying support pressure until observing no failure zone around the shaft is used to simulate the required lining support pressure for different shaft models. Later, regression analysis is carried out to find a generic shaft pressure equation representing the rock mass and the stress state. Finally, the developed pressure equation which shows a good agreement with a case study is used in elastic ‘‘thick-walled cylinder" equation to calculate the lining thickness required to prevent the development of a failure zone around the shaft. At the end of the study, a user-friendly object-oriented computer program ‘‘Shaft 2D" is developed to simplify the rigorous shaft lining thickness calculation process.

关键词： Lining thickness Shaft support Shaft Non-hydrostatic stress

Physical and Mechanical Properties of PP Composites based on Different Types of Lignocellulosic Fillers

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2018年第6期33卷 1298-1307页

作者： Selcuk erdogan Umit HUNER Trakya University Faculty of Engineering Department of Mechanical Engineering

The presents preparation and characterization of different types of lignocellulosic fillers(pine wood sawdust/walnut shell flour/black rice husk powder) reinforced polypropylene composites were presented. The effect of MAPP as coupling agent(4 wt%) on the physical and mechanical properties was also investigated. Polypropylene composites were prepared at different rates of filler/matrix(wt%) by using extrusion(for melt blending) and hot compression molding process. Maximum values of tensile and flexural strength were obtained as 26.1 and 43.4 MPa, respectively, whereas the elongation at break value was 4.11% at 10% pine wood sawdust reinforced PP. Tensile and flexural modulus of composites reached the maximum values as 3855 and 3633 MPa with the composite of 30% walnut shell flour reinforced PP. Characterization of composites was carried out by using tensile test, flexural test, FT-IR, and SEM.

关键词： natural filler water absorption FTIR polypropylene MAPP

Single endoscopist-performed percutaneous endoscopic gastrostomy tube placement

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第26期19卷 4172-4176页

作者： Askin erdogan Department of Gastroenterology Baskent University Alanya Research and Teaching Center

AIM: To investigate whether single endoscopist-performed percutaneous endoscopic gastrostomy (PEG) is safe and to compare the complications of PEG with those reported in the literature. METHODS: Patients who underwent PEG placement between June 2001 and August 2011 at the Baskent University Alanya Teaching and Research Center were evaluated retrospectively. Patients whose PEG was placed for the first time by a single endoscopist were enrolled in the study. PEG was performed using the pull method. All of the patients were evaluated for their indications for PEG, major and minor complications resulting from PEG, nutritional status, C-reactive protein (CRP) levels and the use of antibiotic treatment or antibiotic prophylaxis prior to PEG. Comorbidities, rates, time and reasons for mortality were also evaluated. The reasons for PEG removal and PEG duration were also investigated. RESULTS: Sixty-two patients underwent the PEG procedure for the first time during this study. Eight patients who underwent PEG placement by 2 endoscopists were not enrolled in the study. A total of 54 patients were investigated. The patients' mean age was 69.9 years. The most common indication for PEG was cerebral infarct, which occurred in approximately two-thirds of the patients. The mean albumin level was 3.04 ± 0.7 g/dL, and 76.2% of the patients' albumin levels were below the normal values. The mean CRP level was high in 90.6% of patients prior to the procedure. Approximately two-thirds of the patients received antibiotics for either prophylaxis or treatment for infections prior to the PEG procedure. Mortality was not related to the procedure in any of the patients. Buried bumper syndrome was the only major complication, and it occurred in the third year. In such case, the PEG was removed and a new PEG tube was placed via surgery. Eight patients (15.1%) experienced minor complications, 6 (11.1%) of which were wound infections. All wound infections except one recovered with antibiotic treat

关键词： Gastrostomy Gastric feeding tube Enteral nutrition Enteral feeding Endoscopy Gastrointestinal

Microtextural Characteristics and Origin of Dolomites in the Tepearasi Formation, SW of Beysehir-Konya, Turkey

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

Acta Geologica Sinica(English Edition) 2002年第1期76卷 100-109页

作者： erdogan TEKIN Ali SARI Department of Geological Engineering Faculty of Engineering Ankara UniversityTandogan Ankara 06100 TurkeyDepartment of Geological Engineering Faculty of Engineering Ankara UniversityTandogan Ankara 06100 Turkey

The Tepearasi Formation of the autochthonous Geyikdagi Group in the CentralTauride Belt, SE of Beysehir, is Dogger in age and consists dominantly of massive limestones andgreyish dolomites occurring within the middle to upper sections. The total thickness of thedolomitic levels ranges from 100-300 m and laterally extends 500-700 m. Three types of dolomite weredistinguished through petrographic analyses: homogeneous, mottled (saddle-crystalline) andjoint-filling dolomite, which were interpreted to have formed in two different stages, earlydiagenetic and late diagenetic. The homogeneous dolomite of the early diagenetic stage islight-coloured and monotonous-textured and shows the form of a dolosparite mosaic. The mottleddolomite formed in the late diagenetic stage is light- to dark-coloured and coarsely granularidiomorphic. The other type of late diagenetic dolomite, described as the joint-filling type,presents a crystal growth pattern from the joint walls towards the centre of the joint space. It isassociated with coarse calcite crystals as well as primary dolomite crystal clasts which were formedin the early diagenetic stage. In addition to these characteristics, cataclastic texture indicatingthe influence of tectonism is also observed. Microtexture-oriented scanning electron microscopy(SEM) studies indicate that mottled dolomites show zonal structures and contain secondarydissolution vugs. SEM studies also revealed the existence of some remains (calcite, clay etc.) injoint-filling dolomites. Analyses by energy dispersive spectrometry (EDS) indicate the existence ofclay minerals (likely to be illite) in the pores of dolomite. Isotope studies conducted to shedlight onto the origin of the dolomites of the Tepearasi Formation yielded the results of delta^18O=-2.48 to - 3.87 per thousand and delta^13C=0.93 to l.12 per thousand for the early diagenetichomogeneous dolomites. Mottled and joint-filling type dolomites of the late diagenetic stage, on theother hand, gave the r

关键词： Tepearasi dolomites microtextural characteristics dolomitization models

Micro and Nanofabrication methods to control cell-substrate interactions and cell behavior: A review from the tissue engineering perspective

在线全文

学校读者我要写书评

暂无评论

Bioactive Materials 2018年第3期3卷 355-369页

作者： Menekse Ermis ezgi Antmen Vasif Hasirci BIOMATEN Middle East Technical University(METU)Center of Excellence in Biomaterials and Tissue EngineeringAnkaraTurkey METU Department of Biomedical EngineeringAnkaraTurkey METU Department of BiotechnologyAnkaraTurkey METU Department of Biological SciencesAnkaraTurkey

Cell-substrate interactions play a crucial role in the design of better biomaterials and integration ofimplants with the tissues. Adhesion is the binding process of the cells to the substrate through interactionsbetween the surface molecules of the cell membrane and the substrate. There are severalfactors that affect cell adhesion including substrate surface chemistry, topography, and stiffness. Thesefactors physically and chemically guide and influence the adhesion strength, spreading, shape and fate ofthe cell. Recently, technological advances enabled us to precisely engineer the geometry and chemistry ofsubstrate surfaces enabling the control of the interaction cells with the substrate. Some of the mostcommonly used surface engineering methods for eliciting the desired cellular responses on biomaterialsare photolithography, electron beam lithography, microcontact printing, and microfluidics. Thesemethods allow production of nano- and micron level substrate features that can control cell adhesion,migration, differentiation, shape of the cells and the nuclei as well as measurement of the forces involvedin such activities. This review aims to summarize the current techniques and associate these techniqueswith cellular responses in order to emphasize the effect of chemistry, dimensions, density and design ofsurface patterns on cell-substrate interactions. We conclude with future projections in the field of cellsubstrateinteractions in the hope of providing an outlook for the future studies.

关键词： Microfabrication Micropattern Cell-material interaction Differentiation Cell adhesion

A fast and efficient coordinated vehicle-to-grid discharging control scheme for peak shaving in power distribution system

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

Journal of Modern Power Systems and Clean Energy 2018年第3期6卷 555-566页

作者： Nuh erdogan Fatih ERDEN Mithat KISACIKOGLU Department of Electrical Engineering University of Texas at Arlington Department of Electrical and Electronics Engineering Bilkent University Department of Electrical and Computer Engineering University of Alabama

This study focuses on the potential role of plugin electric vehicles(PEVs) as a distributed energy storage unit to provide peak demand minimization in power distribution systems. Vehicle-to-grid(V2 G) power and currently available information transfer technology enables utility companies to use this stored energy. The V2 G process is first formulated as an optimal control ***, a two-stage V2 G discharging control scheme is proposed. In the first stage, a desired level for peak shaving and duration for V2 G service are determined off-line based on forecasted loading profile and PEV mobility model. In the second stage, the discharging rates of PEVs are dynamically adjusted in real time by considering the actual grid load and the characteristics of PEVs connected to the grid. The optimal and proposed V2 G algorithms are tested using a real residential distribution transformer and PEV mobility data collected from field with different battery and charger ratings for heuristic user case scenarios. The peak shaving performance is assessed in terms of peak shaving index and peak load reduction. Proposed solution is shown to be competitive with the optimal solution while avoiding high computational loads. The impact of the V2 G management strategy on the system loading at night is also analyzed by implementing an off-line charging scheduling algorithm.

关键词： Distribution transformer Optimal discharging control Peak shaving Plug-in electric vehicles Vehicle-togrid

Design of Buoys for Mounting Wind Turbines at Exposed Sites

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2018年第2期17卷 257-266页

作者： erdogan Beytullah CELIKKOL Barbaros SWIFT Robinson Department of Mechanical Engineering Bülent Ecevit UniversityZonguldak 67200Turkey Department of Mechanical Engineering University of New HampshireDurhamNH 03824USA

In this study, two designs for a buoy capable of supporting a 10 kW wind turbine and its tower were developed to operate at the University of New Hampshire's Center of Ocean Renewable Energy testing site located off the Isles of Shoals, New Hampshire. The buoys are to be moored by a catenary chain system. To evaluate wave response, two Froude-scaled models were constructed, tested, and compared at the Ocean Engineering wave tank at the University of New Hampshire. These buoys have been implemented and compared with wave tank measurements of the spar displacement at a reference elevation 2.44 m above the mean water level.

关键词： wind energy ocean wave buoy

Telenutrition for the management of inflammatory bowel disease:Benefits,limits,and future perspectives

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2023年第2期11卷 308-315页

作者： Merve Güney Coşku ezgi Kolay Metin Basaranoglu Department of Nutrition and Dietetics Istanbul Medipol UniversityFaculty of Health SciencesIstanbul 34810Turkey Department of Nutrition and Dietetics Institute of Health SciencesIstanbul Medipol UniversityIstanbul 34810Turkey Dietitian Independent ResearcherIstanbul 34000Turkey Department of Gastroenterology Bezmialem Vakif University Faculty of MedicineIstanbul 34093Turkey

Patients with inflammatory bowel disease(IBD)require lifelong and personalized care by a multidisciplinary healthcare ***,the traditional medical model is not ideal for patients who require continuous close monitoring and whose symptoms may dramatically worsen between regularly scheduled ***,close dietary follow-up and monitoring of IBD in a traditional setting are challenging because of the disease complexity,high pressure on outpatient clinics with a small number of IBD specialist dietitians,and rising *** the significant burden of IBD,there is a need to develop effective dietary management *** coronavirus disease 2019 pandemic caused an unprecedented shift from in-person care to delivering health care via technological remote *** nutrition therapy and consultation can be provided by telenutrition through remote electronic communication applications that could greatly benefit patient *** might be useful,safe,and cost-effective compared with standard *** is likely that virtual care for chronic diseases including IBD will continue in some form into the *** review article summarizes the evidence about telenutrition applications in the management of IBD patients,and we gave an overview of the acceptance and impact of these interventions on health outcomes.

关键词： Telenutrition Telemedicine Digital health Inflammatory bowel disease Symptom monitoring Self-management