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Filtreler
Filtreler
Bulunan: 27 Adet 0.001 sn
Yayın Tarihi : 2022 ✕Koleksiyon : Mühendislik ve Doğa ... ✕
Koleksiyon [8]
İlgili Araştırmacılar [20]
Ambargo Durumu [1]
Tam Metin [1]
Yayın Türü [3]
Yazar/lar [20]
Atıf Dizini [4]
Konu Başlıkları [20]
Yayıncı [15]
Yayın Tarihi [1]
Yayın Dili [2]
Erişime Açık

Forecasting of solar radiation using different machine learning approaches

DEMİR, Vahdettin | ÇITAKOĞLU, Hatice

In this study, monthly solar radiation (SR) estimation was performed using five different machine learning-based approaches. The models used are support vector machine regression (SVMR), long short-term memory (LSTM), Gaussian process regression (GPR), extreme learning machines (ELM) and K-nearest neighbors (KNN). Modeling of these approaches was carried out in two stages. In the first stage, VIF analysis was carried out to develop the model. Thus, the input parameters that decrease the performance of the model are removed. In the second stage, remaining input parameters such as meteorological ...Daha fazlası

Makale 2022 Neural Computing and Applications 6 Görüntülenme
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Determination of Optimum Pinch Point Temperature Difference Depending on Heat Source Temperature and Organic Fluid with Genetic Algorithm

ATA, Sadık | KAHRAMAN, Ali | ŞAHİN, Remzi

In this study, the effect of evaporator pinch point temperature difference (∆TPP,e) value in Organic Rankine Cycle (ORC) on system performance was determined. Under different applications of ORC, optimum ∆TPP,e value has been determined in ORC systems designed with different heat source temperatures. By changing the ∆TPP,e value, the heat input provided to the system, the mass flow of organic fluid, the evaporation pressure and the enthalpy drop in the turbine are affected. In thermodynamic optimization, the objective function is determined as turbine power maximization. Genetic algorithm opti ...Daha fazlası

Makale 2022 Academic Platform Journal of Engineering and Smart Systems (APJESS) 7 Görüntülenme
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Measurement of beauty production via non-prompt D0 mesons in Pb-Pb collisions at √sNN = 5.02 TeV

KARASU UYSAL, Ayben | ALICE Collaboration

The production of non-prompt D0 mesons from beauty-hadron decays was measured at midrapidity (|y| < 0.5) in Pb-Pb collisions at a nucleon-nucleon center-ofmass energy of √ sNN = 5.02 TeV with the ALICE experiment at the LHC. Their nuclear modification factor (RAA), measured for the first time down to pT = 1 GeV/c in the 0–10% and 30–50% centrality classes, indicates a significant suppression, up to a factor of about three, for pT > 5 GeV/c in the 0–10% central Pb-Pb collisions. The data are described by models that include both collisional and radiative processes in the calculation of beautyqu ...Daha fazlası

Makale 2022 2 Görüntülenme
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Trend analysis of lakes and sinkholes in the Konya Closed Basin, in Turkey

DEMİR, Vahdettin

This study aims to investigate the trend of water-level changes in lakes (Lake Tuz and Lake Beyşehir) and sinkholes (Timraş and Kızören) in the Konya Closed Basin located in Turkey. Water-level changes in these lakes and sinkholes were investigated along with changes in meteorological parameters (precipitation, temperature, and evaporation) and groundwater trends that indicate the climate in the region. Several statistical tests can be used to determine the signifcance of hydrological trends over time. These tests are divided into two categories: parametric and nonparametric. In this study, th ...Daha fazlası

Makale 2022 Natural Hazards 4 Görüntülenme
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Jeotermal ısı kaynaklı Organik Rankine Çevriminde kuru ve izantropik akışkanların çevresel etkilerinin ve termodinamik performanslarının karşılaştırılması

ATA, Sadık | AKSOY, Mehmet | ŞAHİN, Remzi | KAHRAMAN, Ali

Organik Rankine Çevrimi (ORÇ), düşük sıcaklık aralığında su yerine organik akışkanın kullanıldığı bir elektrik üretim sistemidir. ORÇ, elektrik üretmek için atık ısıyı değerlendirmek amacıyla santrallerde kullanılmaktadır. Bu çalışmada kuru ve izantropik akışkanlar kullanılarak ORÇ modelinin çevresel ve termodinamik performans karşılaştırmaları yapılmıştır. Jeotermal uygulamaları kapsamında ısı kaynağı sıcaklığı 110 °C olarak belirlenmiştir. Buharlaşma sıcaklığının 65-100 °C arasında değişmesinin sistem performansı üzerindeki etkisi belirlenmiştir. Performans parametreleri olarak pompa işi, tü ...Daha fazlası

Makale 2022 GUFBD / GUJS Gümüşhane Üniversitesi FBD 3 Görüntülenme
Erişime Açık

Methylene Blue Removal By Phase Separated Porous Glass

ERTUŞ, Emre Burak | AHMETOĞLU, Çekdar Vakıf | ÖZTÜRK, Abdullah

In this study, it was aimed to utilize Porous glass (PG) as an adsorbent in MB removal from wastewater. PG powders were produced by melting and phase separation of an alkali borosilicate glass followed by selective leaching in HCl and an additional alkali treatment. The scanning electron microscope and N2 adsorption/desorption techniques were applied to characterize the pore architecture of the PGs. Methylene blue (MB) adsorption efficiency was investigated from the change in MB concentration in the MB aqueous solutions with various concentrations through the absorbance of the solution at a wa ...Daha fazlası

Konferans Bildirisi 2022 2 Görüntülenme
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Developing numerical equality to regional intensity–duration–frequency curves using evolutionary algorithms and multi‑gene genetic programming

ÇITAKOĞLU, Hatice | DEMİR, Vahdettin

This study aims to carry out regional intensity−duration−frequency (IDF) equality using the relationship with IDF obtained from point frequency analysis. Eleven empirical equations used in the literature for seven climate regions of Turkey were calibrated using particle swarm optimization (PSO) and genetic algorithm (GA) optimization techniques and the obtained results were compared. In addition, in this study, new regional IDF equations were obtained for each region utilizing MultiGene Genetic Programming (MGGP) method. Finally, Kruskal–Wallis (KW) test was applied to the IDF values obtained ...Daha fazlası

Makale 2022 Acta Geophysica 6 Görüntülenme
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Macro and Polypropropylene fiber effect on reinforced concrete beams with insufficient lap splice length

AKIN, Süleyman Kamil | KARTAL, Saruhan | MÜSEVİTOĞLU, Abdullah | SANCIOĞLU, Sadrettin | ZIA, Ahmad Javid | İLGÜN, Abdulkerim

For longer spans of reinforced concrete elements, design codes dictate the use of sufficient lap splice length. Insufficient lap splice length decreases the flexural strength and ductility of reinforced concrete (RC) beams, while fiber addition improves their load-carrying capacity, ductility, and durability. The main purpose of this study was to examine the effects of micro and macro fibers on the lap splice length of RC beams. In this regard, the effect of fiber addition on RC beams having insufficient lap splice length under bending test has been studied in detail. Mixtures were prepared wi ...Daha fazlası

Makale 2022 Case Studies in Construction Materials 12 Görüntülenme
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First study of the two-body scattering involving charm hadrons

KARASU UYSAL, Ayben | ALICE Collaboration

This article presents the first measurement of the interaction between charm hadrons and nucleons. The two-particle momentum correlations of pD− and pD¯ þ pairs are measured by the ALICE Collaboration in high-multiplicity pp collisions at ffiffi s p ¼ 13 TeV. The data are compatible with the Coulomb-only interaction hypothesis within ð1.1–1.5Þσ. The level of agreement slightly improves if an attractive nucleon ðNÞD strong interaction is considered, in contrast to most model predictions which suggest an overall ¯ repulsive interaction. This measurement allows for the first time an estimation of ...Daha fazlası

Makale 2022 11 Görüntülenme
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Measurement of anti-3 He nuclei absorption in matter and impact on their propagation in the Galaxy

KARASU UYSAL, Ayben | ALICE Collaboration

In our Galaxy, light antinuclei composed of antiprotons and antineutrons can be produced through high-energy cosmic-ray collisions with the interstellar medium or could also originate from the annihilation of dark-matter particles that have not yet been discovered. On Earth, the only way to produce and study antinuclei with high precision is to create them at high-energy particle accelerators. Although the properties of elementary antiparticles have been studied in detail, the knowledge of the interaction of light antinuclei with matter is limited. We determine the disappearance probability of ...Daha fazlası

Makale 2022 8 Görüntülenme
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Farklı Bağ Kaplama Uygulamalarının Yüksek Sıcaklık Ve Katı Partikül Erozyon Aşınmasına Etkisi

DEMİRCİ, Musa | BAĞCI, Mehmet

Inconel 718 altlık malzeme üzerine iki farklı bağ kaplama (NiCrAlY ve NiCoCrAlY), Atmosferik Plazma Sprey (APS) ve Yüksek Hızlı Oksi-Yakıt Püskürtme (HVOF) yöntemleri kullanılarak uygulanmıştır. Enerji dönüşüm santralleri, gaz türbinleri, jet motor kanatları vb. uygulamalarda kullanılan bağ kaplamaların yüksek sıcaklık altında partikül etkisine maruz kalmasının simüle edilmesi amaçlanmıştır. Kaplama işlemi sonunda farklı özelliklere sahip dört numune grubu oluşturulmuştur. Bu numunelerin ortam koşulları ve sıcaklık altında katı partikül erozyon aşınma davranışları incelenmiştir. Deneylerde, yü ...Daha fazlası

Makale 2022 Mühendis ve Makina 2 Görüntülenme
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Erosion of ceramic coating applications under the influence of APS and HVOF methods

DEMİRCİ, Musa | BAĞCI, Mehmet

The erosion wear of the thermal barrier coating (TBC) application created by the ceramic topcoat effect on the substrate material and the high-temperature resistance has been researched in the study. Solid particle erosion effect has an important role in high-temperature applications such as energy conversion plants, gas turbines, and jet engine blades. In these applications where the ambient temperature varies and high-temperature effect is important, the deformation resistance is an important criterion in TBC’s produced with atmospheric plasma spray (APS) and high-velocity oxy fuel (HVOF) me ...Daha fazlası

Makale 2022 Springer 3 Görüntülenme
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