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Bulunan: 12 Adet 0.001 sn
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Filtreler
Filtreler
Bulunan: 12 Adet 0.001 sn
BM Sürdürülebilir Kalkınma : Erişilebilir ve Temi ... ✕Yayımlanma Yılı : 2021 ✕
Koleksiyon [1]
Araştırmacılar [4]
BM Sürdürülebilir Kalkınma [2]
Fakültesi / Enstitütü [1]
Yayın Türü [2]
Yayımlanma Yılı [1]
Dil [1]
Kaynak [9]
Veri Tabanları [8]
İndex Türü [4]
Yayıncı [6]
Bölümü [2]
Ulusal/Uluslararası [1]
Konu Başlıkları [35]
Erişilebilir ve Temiz EnerjiHerkes için karşılanabilir, güvenilir, sürdürülebilir ve modern enerjiye erişimi sağlamak
Erişime Açık

Tailoring Cadmium Composition on Titanium Dioxide to Achieve Enhanced Photocatalytic Glucose Fuel Cell Anode Performance

Nahit AKTAŞ

In this study, titanium dioxide (TiO2)-supported Cd catalysts were prepared at 0.05-3 of Cd loading by employing the incipient wetness impregnation method. These catalysts were characterized via X-ray diffraction (XRD), scanning electron microscopy-energy-dispersive X-ray (SEM-EDX), high-angle annular dark-field scanning transmission electron microscopy and TEM-EDS mapping, inductively coupled plasma-mass spectrometry ( ICP-MS), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (TPR), temperature-programmed oxidation (TPO), and temperature-programmed desorption (TPD). XR ...Daha fazlası

Makale 2021 Mühendislik Fakültesi ACS Applied Energy Materials4 ( 11 ) 80 Görüntülenme
Erişime Açık

Predictive Compensation of EAF Flicker, Voltage Dips Harmonics and Interharmonics Using Deep Learning

Özgül SALOR-DURNA

In this research work, deep machine learning based methods together with a novel data augmentation are developed for predicting flicker, voltage dip, harmonics and interharmonics originating from highly time-varying electric arc furnace (EAF) currents and voltage. The aim with the prediction is to counteract both the response time delays and reaction time delays of active power filters (APFs) specifically designed for electric arc furnaces (EAF). Multiple synchronous Reference frame (MSRF) analysis is used to decompose the frequency components of the EAF current and voltage waveforms into dqo ...Daha fazlası

Konferans Bildirisi 2021 Mühendislik Fakültesi IEEE Industry Applications Society Annual Meeting 69 Görüntülenme
Erişime Açık

Harmonic Contribution Detection of Iron and Steel Plants Based on Correlation of Time-Synchronized Current and Voltage Signals

Özgül SALOR-DURNA

In this paper, the problem of detecting the harmonic responsibility of iron and steel (I&S) plants, which are supplied from a point of common coupling (PCC) is addressed. A new harmonic responsibility measure, which does not require the instantaneous impedance measurements, is proposed to present the amount of harmonic responsibility of each plant supplied from the PCC. The algorithm is based primarily on the correlation of voltage and current signals which are measured with a time-synchronized manner at the PCC. The proposed method is first verified using both synthetic data generated in PSCA ...Daha fazlası

Konferans Bildirisi 2021 Mühendislik Fakültesi IEEE Industry Applications Society Annual Meeting 37 Görüntülenme
Erişime Açık

Fabrication of Carbon-Doped Titanium Dioxide Nanotubes as Anode Materials for Photocatalytic Glucose Fuel Cells

Nahit AKTAŞ | Ali Osman SOLAK

In the present work, TiO2 nanotubes (TNT) and carbon-doped TiO2 nanotubes (C-TNT) were produced via the anodization method. Carbon doping was performed on TNT in a tubular oven employing two different 15 cm3/min total flow rates with varying compositions of acetylene (C2H2) and argon (Ar) as VC2H2/Ar = 7/93 (1 cm3/min C2H2   14 cm3/min Ar) for C-TNT (7:93) and VC2H2/Ar = 33/67 (5 cm3/min C2H2   10 cm3/min Ar) for C-TNT (33:67). The synthesized C-doped TNT was characterized by x-ray diffraction (XRD), Raman spectroscopy, and scanning electron microscopy (SEM). XRD, Raman spectra, and SEM result ...Daha fazlası

Makale 2021 Mühendislik Fakültesi Journal of Electronic Materials50 ( 4 ) 81 Görüntülenme
Erişime Açık

New formalism for characterization of simple non-reciprocal networks free from singularity-point problem

Mehmet ERTUĞRUL

A method has been proposed for accurate characterization of non-reciprocal networks without enforcing the passivity principle. Thanks to the introduced different even and odd coefficients, our method has no singularity-point problem as compared with the conventional method. The proposed method is validated by scattering parameter measurements of a ferrite-loaded waveguide shifter. In addition, it is demonstrated by measurements that our method, as compared with the conventional one, is more resistant to random noise due to post-calibration effects.

Makale 2021 Mühendislik Fakültesi Measurement177 64 Görüntülenme
Erişime Açık

Prediction of water-adulteration within honey by air-line de-embedding waveguide measurements

Mehmet ERTUĞRUL

An efficient de-embedding air-line microwave method has been proposed for accurate relative complex permittivity, epsilon(r) = epsilon(r)

Makale 2021 Mühendislik Fakültesi Measurement179 110 Görüntülenme
Erişime Açık

Coupling analysis between resonating metamaterial slabs using scattering parameters

Mehmet ERTUĞRUL

Metamaterial (MM) slabs in close proximity can couple with one another. This coupling can modify the electromagnetic response of the overall MM structure involving individual MM resonators. The signal flow graph technique along with the ABCD parameters are applied to quantitatively and qualitatively examine this coupling from simulated/measured scattering parameters of cascade connection of closely or largely separated MM slabs. S-parameter measurements of a MM slab constructed by split-ring-resonators were carried out at X-band (8.2-12.4 GHz) to validate our theoretical analysis.

Makale 2021 Mühendislik Fakültesi Measurement182 80 Görüntülenme
Erişime Açık

Electromagnetic characterization of strong-coupled Omega-type bianisotropic metamaterials using the state transition matrix method

Mehmet ERTUĞRUL

A feasible extraction procedure is proposed to retrieve the diagonal tensor elements of the permittivity and permeability, and the magnetoelectric coupling coefficient of Omega-type biansiotropic metamaterials (MMs). The procedure is based on the state transition matrix approach and uses non-iterative closed-form expressions between constitutive parameters and scattering (S-) parameters to achieve such determination using S-parameters for normal incidence and oblique incidence of TE and TM modes (a desirable feature from practical point of view). S-parameter simulations of a bianisotropic MM s ...Daha fazlası

Makale 2021 Mühendislik Fakültesi Waves in Random and Complex Media ( Published online: 22 Jul 2021 ) 55 Görüntülenme
Erişime Açık

The preparation, characterization, and electrooxidation of colloidal palladium modified poly(methacrylic acid) hydrogel as formic acid fuel cell anode catalyst

Nahit AKTAŞ

At present, poly(methacrylic acid) (MA), poly(MA) hydrogel, and Pd-doped poly(MA) hydrogel modified electrodes are constructed on graphite pencil (G). The Pd precursor is coated on the poly(MA)/G electrodes surface using the electrodeposition method. These electrodes are characterized by thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy, and scanning electron microscopy-energy dispersive X-ray. Poly(MA) hydrogel and Pd-doped poly(MA) hydrogel are successfully prepared by the polymerization and further electrodeposition. Formic acid electro-oxidation (FAEO) activities ar ...Daha fazlası

Makale 2021 Mühendislik Fakültesi Energy Storage4 ( 1 ) 196 Görüntülenme
Erişime Açık

Statistical Models of EAF Harmonics Developed for Harmonic Estimation Directly from Waveform Samples Using Deep Learning Framework

Özgül SALOR-DURNA

In this research work, a deep learning (DL)-based method for the fast and accurate analysis of current harmonics of electric arc furnaces (EAF) is proposed. For such a system, a large amount of EAF current data is required for the training phase of the DL-based structure, which is not only a thorny but also an expensive procedure. Hence, the second focus of this research work is to gain the ability to generate EAF currents with realistic harmonic contents based on a much smaller amount of field data of EAF currents. For this purpose, EAF current data, recorded at a transformer substation suppl ...Daha fazlası

Makale 2021 Mühendislik Fakültesi IEEE Transactions on Industry Applications57 ( 6 ) 54 Görüntülenme
Erişime Açık

Complex Permittivity and Thickness Evaluation of Low-Loss Dielectrics From Uncalibrated Free-Space Time-Domain Measurements

Mehmet ERTUĞRUL

A free-space time-domain method is proposed to retrieve dielectric constant (epsilon r), conductivity (sigma e), and thickness (d) of metal-backed low-loss dielectric samples using calibration-independent reflected power peak measurements. Its algorithm is validated by numerical calculations and simulations (CST Microwave Studio) using a sine-modulated Gaussian window. A sensitivity analysis is followed to examine its performance considering the dependencies of reflected power peaks with respect to epsilon r and sigma e. Free-space time-domain measurements have been implemented after transform ...Daha fazlası

Makale 2021 Mühendislik Fakültesi IEEE Transactions on Geoscience and Remote Sensing60 ( Published online: 02 July 2021 ) 108 Görüntülenme
Erişime Açık

Flicker Detection Algorithm Based on the Whole Voltage Frequency Spectrum for New Generation Lamps - Enhanced VPD Flickermeter Model and Flicker Curve

Özgül SALOR-DURNA

It is now known that disturbing light flicker originates not only solely from amplitude modulation (AM) of the fundamental amplitude and low-frequency interharmonic components as described in IEC 61000-4-15 standard but also high-frequency interharmonic components around an odd harmonic which have the same effect as low-frequency components causing flicker. Because this effect cannot be detected by the IEC flickermeter, an effective flickermeter is required In this article, a new flickermeter detects both the low- and high-frequency components robustly has been suggested. Quite close responses ...Daha fazlası

Makale 2021 Mühendislik Fakültesi Electric Power Components and Systems49 ( 6-7 ) 82 Görüntülenme
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