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İptal
Bulunan: 157 Adet 0.004 sn
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Filtreler
Filtreler
Bulunan: 157 Adet 0.004 sn
Yayıncı : Elsevier Ltd ✕
Koleksiyon [28]
İlgili Araştırmacılar [63]
Ambargo Durumu [1]
Tam Metin [2]
Yazar [90]
Yayın Türü [6]
Yayın Yılı [24]
Yayın Dili [1]
Dergi Adı [73]
Yayıncı [1]
Konu Başlıkları [90]

The effect of cutting speed and cutting tool geometry on machinability properties of nickel-base Inconel 718 super alloys

Nalbant, Muammer | Altın, Abdullah | Gökkaya, Hasan

The effects of cutting speed and cutting tool geometry on cutting forces are investigated in this study. For this purpose, nickel-base super alloy, Inconel 718, is machined with dry cutting conditions by using digital controlled computer lathe with ceramic cutting tools in two different geometries and three different material qualities. Metal removing process is carried out for four different cutting speeds (150 m/min, 200 m/min, 250 m/min, and 300 m/min), while a cutting depth of 2 mm and a feed rate of 0.20 mm/rev are kept constant. As a result of the experiments, the lowest main cutting for ...Daha fazlası

Makale 2007 Materials and Design28 ( 4 ) , pp. 1 - 1338 367 Görüntülenme

Impact of small-world network topology on the conventional artificial neural network for the diagnosis of diabetes

Erkaymaz, Okan | Özer, Mahmut

Artificial intelligent systems have been widely used for diagnosis of diseases. Due to their importance, new approaches are attempted consistently to increase the performance of these systems. In this study, we introduce a new approach for diagnosis of diabetes based on the Small-World Feed Forward Artificial Neural Network (SW- FFANN). We construct the small-world network by following the Watts-Strogatz approach, and use this architecture for classifying the diabetes, and compare its performance with that of the regular or the conventional FFANN. We show that the classification performance of ...Daha fazlası

Makale 2016 Chaos, Solitons and Fractals83 , pp. 1 - 185 663 Görüntülenme
Erişime Açık

Polyhydroxybutyrate-b-polyethyleneglycol block copolymer for the solid phase extraction of lead and copper in water, baby foods, tea and coffee samples

Wadhwa, Sham Kumar | Tüzen, Mustafa | Kazi, Tasneem Gul | Soylak, Mustafa | Hazer, Baki

A new adsorbent, polyhydroxybutyrate-b-polyethyleneglycol, was used for the separation and preconcentration of copper(II) and lead(II) ions prior to their flame atomic absorption spectrometric detections. The influences of parameters such as pH, amount of adsorbent, flow rates and sample volumes were investigated. The polymer does not interact with alkaline, alkaline-earth metals and transition metals. The enrichment factor was 50. The detection limits were 0.32 µg L-1 and 1.82 µg L-1 for copper and lead, respectively. The recovery values were found >95%. The relative standard deviations we ...Daha fazlası

Makale 2014 Food Chemistry152 , pp. 7 - 80 742 Görüntülenme

Solid phase extraction of lead, cadmium and zinc on biodegradable polyhydroxybutyrate diethanol amine (PHB-DEA) polymer and their determination in water and food samples

Tüzen, Mustafa | Şahiner, Samet | Hazer, Baki

A new biodegradable polyhydroxybutyrate diethanol amine (PHB-DEA) polymer was used as adsorbent for the sensitive and selective separation, preconcentration and determination of Pb(II), Cd(II) and Zn(II) by using atomic absorption spectrometry. Diethyl dithiocarbamate was used as chelating reagent. Analytical parameters such as pH, eluent type and its volume, flow rates of sample solution, ligand amount, sample volume were optimized. Effects of some cations, anions and transition metal ions were also investigated. Enrichment factor and relative standard deviation were found to be 100 and 3%, r ...Daha fazlası

Makale 2016 Food Chemistry210 , pp. 1 - 120 761 Görüntülenme

A newly synthesized graft copolymer for magnetic solid phase microextraction of total selenium and its electrothermal atomic absorption spectrometric determination in food and water samples

Açıkkapı, Ayşe Nihan | Tüzen, Mustafa | Hazer, Baki

A newly synthesized polystyrene-g-polyoleic acid-g-polyethylene glycol graft copolymer (PoleS-PEG) was used as adsorbent in the solid phase microextraction of selenium ions by using electrothermal atomic absorption spectrometry (ETAAS). Neodymium magnet was used for separation of analyte ions. Various analytical parameters such as pH, adsorbent amount, mixing time, eluent solution, sample volume, etc. were optimized. The matrix effects of some cations and anions were also studied. The capacity of the adsorbent was found 11.5 mg g -1 . The preconcentration factor was found to be 50. The detecti ...Daha fazlası

Makale 2019 Food Chemistry284 , pp. 1 - 7 824 Görüntülenme
Erişime Açık

Kinetic study of vinyl polymerization with a new oligo azo peroxidic initiator

Volga, Cüneyt | Hazer, Baki | Torul, Oktay

Oligo (4,4'-azobis-cyanopentanoyl-5-peroxy-2,5-dimethyl-n-hexylperoxide), Lu-Ab, was synthesized by the interfacial condensation of 4,4'-azobis-(4-cyanopentanoyl chloride) with 2,5-dimethyl-2,5-dihydroperoxyhexane in the presence of a base. The molecular weight of the initiator was determined to be 1586 g/mol by gel permeation chromatography (GPC). Oligo-azoperoxide, Lu-Ab, was characterized by infrared and nuclear magnetic resonance spectroscopies. Styrene and methyl methacrylate were separately polymerized with Lu-Ab at 60°C by free radical low conversion polymerization in order to calculate ...Daha fazlası

Makale 1997 European Polymer Journal33 ( 6 ) , pp. 9 - 912 513 Görüntülenme
Erişime Açık

Prediction of the bottom ash formed in a coal-fired power plant using artificial neural networks

Bekat, Tuğçe | Erdoğan, Muharrem | İnal, Fikret | Genç, Ayten

The amount of bottom ash formed in a pulverized coal-fired power plant was predicted by artificial neural network modeling using one-year operating data of the plant and the properties of the coals processed. The model output was defined as the ratio of amount of bottom ash produced to amount of coal burned (Bottom ash/Coal burned). The input parameters were the moisture contents, ash contents and lower heating values of the coals. The total 653 data were divided into two groups for the training (90% of the data) and the testing (10% of the data) of the network. A three-layer, feed-forward typ ...Daha fazlası

Makale 2012 Energy45 ( 1 ) , pp. 8 - 887 587 Görüntülenme

Effects of coal properties on the production rate of combustion solid residue

Durgun D. | Genç, Ayten

The production rates of furnace bottom ash in a pulverized coal-fired power plant were monitored for a two-year period and its variations with respect to coal properties were analyzed. The power plant was originally designed to fire the coal sludge generated from a washing process; however, the coal sludge and its mixture with low-rank bituminous coal have been started to be used as the main fuel with time. The results of the hardgrove grindability measurements have shown that the grinding properties of sludge or its mixtures could not be predicted based on proximate analysis (moisture, ash, c ...Daha fazlası

Makale 2009 Energy34 ( 11 ) , pp. 1 - 1979 585 Görüntülenme

Detection of directional eye movements based on the electrooculogram signals through an artificial neural network

Erkaymaz, Hande | Özer, Mahmut | Orak, İlhami Muharrem

The electrooculogram signals are very important at extracting information about detection of directional eye movements. Therefore, in this study, we propose a new intelligent detection model involving an artificial neural network for the eye movements based on the electrooculogram signals. In addition to conventional eye movements, our model also involves the detection of tic and blinking of an eye. We extract only two features from the electrooculogram signals, and use them as inputs for a feed-forwarded artificial neural network. We develop a new approach to compute these two features, which ...Daha fazlası

Makale 2015 Chaos, Solitons and Fractals77 , pp. 2 - 229 781 Görüntülenme

A novel poly(propylene-co-imidazole) based biofuel cell: System optimization and operation for energy generation

Kılıç, Muhammet Samet | Korkut, Şeyda | Hazer, Baki

This study describes the construction of an enzymatic fuel cell comprised of novel gold nanoparticles embedded poly(propylene-co-imidazole) coated anode and cathode. Working electrode fabrication steps and operational conditions for the fuel cell have been optimized to get enhanced power output. Electrical generation capacity of the optimized cell was tested by using the municipal wastewater sample. The enzymatic fuel cell system reached to maximum power density with 1 µg and 8 µg of polymer quantity and bilirubin oxidase on electrode surface, respectively. The maximum power output was calcula ...Daha fazlası

Makale 2015 Materials Science and Engineering C47 , pp. 1 - 171 1287 Görüntülenme
Erişime Açık

The operation of enzymatic fuel cell fabricated with rationally designed poly(caprolactone-g-ethylene glycol) copolymers

Korkut, Şeyda | Kılıç, Muhammet Samet | Sanal, Timur | Hazer, Baki

This study describes construction of an enzymatic fuel cell comprised of poly(caprolactone-g-ethylene glycol) coated novel glucose oxidase anode and laccase cathode. Rationally designed poly(caprolactone-g-ethylene glycol) containing various poly(ethylene glycol) percentages ranging between 2.67 and 15.04% were synthesized chemically and tested separately for operation of the fuel cell system to achieve the best energy generation. The maximum power density was found to be 80.55 µW cm- 2 at 0.91 V (vs. Ag/AgCl) in pH 5, 100 mM citrate buffer (20 °C) by the addition of 30 mM of glucose from the ...Daha fazlası

Makale 2017 Materials Science and Engineering C76 , pp. 7 - 793 1222 Görüntülenme
Erişime Açık

Simple synthesis of amphiphilic poly(3-hydroxy alkanoate)s with pendant hydroxyl and carboxylic groups via thiol-ene photo click reactions

Hazer, Baki

Biodegradable polymers gained worldwide attention among researchers because of environmental and petroleum reserve limitation issues. In this manner, poly (3-hydroxyalkanoate)s, PHAs, are very useful materials from the point of this view. They can be easily obtained by using several bacteria from renewable substrate such as sugar, plant oils and as well as synthetic chemicals. The improvement of their mechanical properties and enhance hydrophilic character are still main challenge of the polymer scientists. Herein we report the thiol-ene photo click reactions of the unsaturated medium chain le ...Daha fazlası

Makale 2015 Polymer Degradation and Stability119 , pp. 1 - 166 416 Görüntülenme
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