DÜMF Mühendislik Dergisi最新文献_第9页

Thermal and mechanical analysis of thermal power plant ashes, cement and resin composites 热电厂灰、水泥和树脂复合材料的热力学分析

DÜMF Mühendislik Dergisi Pub Date : 2023-01-10 DOI: 10.24012/dumf.1213882

A. Biçer

引用次数: 0

Utilizing the Ensemble of Deep Learning Approaches to Identify Monkeypox Disease 利用深度学习方法的集成来识别猴痘疾病

DÜMF Mühendislik Dergisi Pub Date : 2023-01-02 DOI: 10.24012/dumf.1199679

Sedat Örenç, Emrullah Acar, M. S. Özerdem

引用次数: 4

Effect of fiber orientation and loading direction on the compressive response of E-glass/Epoxy laminated composites used in modern helicopter blades submitted to high strain rate 高应变速率下，纤维取向和加载方向对e -玻璃/环氧复合材料叶片压缩响应的影响

DÜMF Mühendislik Dergisi Pub Date : 2022-12-31 DOI: 10.24012/dumf.1140112

A. Çelik, Y. Arman

{"title":"Effect of fiber orientation and loading direction on the compressive response of E-glass/Epoxy laminated composites used in modern helicopter blades submitted to high strain rate","authors":"A. Çelik, Y. Arman","doi":"10.24012/dumf.1140112","DOIUrl":"https://doi.org/10.24012/dumf.1140112","url":null,"abstract":"In this investigation, the dynamic behaviour of glass fibre reinforced poly- mer under in-plane and out-of-plane dynamic compression tests was studied experimentally and numerically under varying the fibres orientation and the loading conditions. The composites consist of unidirectional E-glass fibers reinforced epoxy polymer composites used in modern helicopter blade application as inner surface. Specimens, with a cylindrical shape, are impacted at a constant strain rate subjected to SHPB and Ls Dyna program. The numerical results are in good agreement with experimental results. The results show that the out-of-plane stress values for different fiber orientation are close to each other, but the in-plane stress value is far lower for the fibers direction of ±45◦. This study will facilitate fiber orientation selection for dynamic effects during the helicopter blade production phase. Not only simple tests but also practical ideas make this study stand out. Considering results, the use of ±90◦ fiber direction in helicopter blades seems to be more advantageous against dynamic effects.","PeriodicalId":158576,"journal":{"name":"DÜMF Mühendislik Dergisi","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121647988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Data division effect on machine learning performance for prediction of streamflow 数据分割对流量预测机器学习性能的影响

DÜMF Mühendislik Dergisi Pub Date : 2022-12-31 DOI: 10.24012/dumf.1158748

O. Katipoğlu

{"title":"Data division effect on machine learning performance for prediction of streamflow","authors":"O. Katipoğlu","doi":"10.24012/dumf.1158748","DOIUrl":"https://doi.org/10.24012/dumf.1158748","url":null,"abstract":"Accurate estimation of streamflow has an important role in water resources management, disaster preparedness and early warning, reservoir operation, and sizing of water structures. In this study, Extreme gradient boosting (XGBoost) and K-Nearest Neighbours (KNN) algorithms are used for the estimation of streamflow. In order to reveal the appropriate model, the raw model and models with optimized parameters were evaluated while the models were being built. In the setup of the models, various training test rates were also tried, and it was investigated which data division showed more effective results. For this purpose, the data were divided into ratios such as 60-40, 70-30, 80-20, and 90-10, respectively, and the model results were compared. Various statistical indicators such as Root Mean Square Error (RMSE), Mean Absolute Error (MAE), and Coefficient of Determination (R2) were used when comparing the models. As a result of the analysis, it was determined that the most suitable model for monthly streamflow estimation was obtained by using the optimized Xgboost algorithm and 60-40% data division. The obtained outputs constitute a vital resource for decision-makers regarding water resources planning and flood and drought management.","PeriodicalId":158576,"journal":{"name":"DÜMF Mühendislik Dergisi","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128561235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The size of portlandite crystals in ITZ and its relation with ratios of ingredients and properties of LWAC 研究了电解液中硅酸盐晶体的大小及其与原料配比和LWAC性能的关系

DÜMF Mühendislik Dergisi Pub Date : 2022-12-28 DOI: 10.24012/dumf.1142093

İ. A. Gönül, H. Ciçek

{"title":"The size of portlandite crystals in ITZ and its relation with ratios of ingredients and properties of LWAC","authors":"İ. A. Gönül, H. Ciçek","doi":"10.24012/dumf.1142093","DOIUrl":"https://doi.org/10.24012/dumf.1142093","url":null,"abstract":"In this experimental study, nine different lightweight aggregate concrete (LWAC) specimens - in which natural lightweight scoria aggregate was used as coarse aggregate - were prepared for investigating the size of portlandite crystals in their interfacial transition zone (ITZ). Scanning Electron Microscope (SEM) was used to determine the size of portlandite crystals in ITZ of LWAC specimens. The size of portlandite crystals in ITZ of these LWAC specimens was determined quantitatively in order to identify its relation with ratios of ingredients and properties of LWAC that were investigated. It was determined that the size of portlandite crystals in ITZ of nine LWAC specimens is in the range of (0.91-2.047) µm. The size of portlandite crystals in ITZ is found to be increased when the water/cement (W/C) and coarse aggregate/total aggregate (Ac/A) ratios of LWAC get increased. On the other hand, the compressive strength and the oven-dry density of LWAC are found to be decreased when the size of portlandite crystals in ITZ gets increased. The best way to make portlandite beneficial from mechanical, physical and durability points of view is to transform it into so-called secondary hydration products by making it react with materials that have proper chemical properties for this transformation. In this case, the small portlandite crystals dissolve entirely, and the large portlandite crystals become smaller. Lightweight scoria aggregate used in this study is thought to have chemical properties to assist such a transformation in ITZ.","PeriodicalId":158576,"journal":{"name":"DÜMF Mühendislik Dergisi","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125250731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Application of Different Technologies for Removal of Rifampicin From Aquatic Environments: A Recent Review 不同技术在水生环境中去除利福平的应用综述

DÜMF Mühendislik Dergisi Pub Date : 2022-12-27 DOI: 10.24012/dumf.1120755

H. Erdem

{"title":"The Application of Different Technologies for Removal of Rifampicin From Aquatic Environments: A Recent Review","authors":"H. Erdem","doi":"10.24012/dumf.1120755","DOIUrl":"https://doi.org/10.24012/dumf.1120755","url":null,"abstract":"Antibiotics are a group of drugs widely used as human and veterinary drugs and in aquaculture and agriculture. Recently, parent compounds and their metabolites are constantly excreted and released into environmental matrices, due to the fact that antibiotics cannot be completely metabolized after consumption by humans and animals and cannot be completely removed by conventional wastewater treatment plants. The accumulation and persistence of antibiotics in environmental matrices can lead to harmful effects on ecosystems, even at concentration levels as low as ng/L to μg/L. Rifampicin (RIF), which belongs to the macrocyclic antibiotic class, is the most important antibiotic widely used in the tuberculosis treatment. Lately, the RIF was detected in aquatic environments and needs to be removal effectively. This review considers the current state of knowledge regarding the sources, fate, effects and removal processes of the antibiotic RIF. In this review, the different treatment techniques such as adsorption, advanced oxidation processes (AOPs) and other technologies (membrane process and moving bed biofilm reactor) for RIF removal were evaluated and compared. A comparison between these techniques was made focusing on performance and efficiency. As a result, it was found that adsorption and AOPs were the most studied method and almost all of the studied RIF removal methods were also to be successful.","PeriodicalId":158576,"journal":{"name":"DÜMF Mühendislik Dergisi","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126513943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Kumsal Sedimanlarının Mikroplastik İçeriklerinin ve Sediman Tanelerinin Karakterizasyonu: Muğla Kıyılarından (GB Türkiye) Örnek Çalışma

DÜMF Mühendislik Dergisi Pub Date : 2022-12-23 DOI: 10.24012/dumf.1212109

Murat Gul, Ceren Küçükuysal, Ahmed Masud

{"title":"Kumsal Sedimanlarının Mikroplastik İçeriklerinin ve Sediman Tanelerinin Karakterizasyonu: Muğla Kıyılarından (GB Türkiye) Örnek Çalışma","authors":"Murat Gul, Ceren Küçükuysal, Ahmed Masud","doi":"10.24012/dumf.1212109","DOIUrl":"https://doi.org/10.24012/dumf.1212109","url":null,"abstract":"Günlük hayatta önemli bir yere sahip olan plastikler, fiziksel bozunmaya uğradıklarında kolaylıkla taşınarak göllere, akarsulara, denizlere, dağlara ve topraklara ulaşmakta ve kirletici olarak tüm doğal ekosistemlere zarar vermektedirler. Mikroplastiklerin özellikle kıyı alanlarında birikimini etkileyen en önemli unsurlardan ilki jeolojik süreçlerden olan karasal ve denizel sedimanların taşınımları ikincisi ise antropojenik etmenlerdir. Muğla kıyı sedimanlarında biriken mikroplastik miktarını belirlemek amacıyla Palamutbükü, Datça, Marmaris ve Akyaka sahil kumlarından alınan örnekler tane boyu bakımından karakterize edilmiş; düşük yoğunluklu mikroplastik ayırma yöntemleri kullanılmıştır. Plastik içeriği sırasıyla; Palamutbükü örneğinde 11 adet meso-makro plastik, 56 adet mikroplastik / 50 g, Datça örneğinde 13 adet meso-makro plastik, 33 adet mikroplastik / 50 g, Marmaris örneğinde 13 adet meso-makro plastik, 143 adet mikroplastik / 50 g, ve Akyaka örneğinde 4 adet meso-makro plastik, 59 adet mikroplastik / 50 g olarak belirlenmiştir. Orta kum boyunda, incelenen örnekler içinde en küçük ortalama tane boyutuna sahip Akyaka sahili örneği meso-makroplastik içeriği en düşük olandır. İnce çakıl ortalama tane boyuyla en kaba ortalama tane boyuna ve en yüksek çakıl yüzdesine sahip Datça örneği ise mikroplastik sayısı en düşük örnektir. Lif ve parça formunda plastik parçalarında Fourier Dönüşümlü Kızıl Ötesi Spektrometresi analizi gerçekleştirilmiştir. Mikroplastiklerin bileşimlerinde selülöz, polietilen ve polipropilen olduğu belirlenmiştir.","PeriodicalId":158576,"journal":{"name":"DÜMF Mühendislik Dergisi","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121512532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sabit Hız İle Yörünge Takibi Sağlayan Dört Çubuk Mekanizmasının Hız Kontrolü

DÜMF Mühendislik Dergisi Pub Date : 2022-12-20 DOI: 10.24012/dumf.1173407

Halit Hülako, Orhan Çakar

引用次数: 0

Barajların deşarj yapılarındaki akış karakteristikleri ve enerji kırıcı yapıların etkinliğinin sayısal analizi

DÜMF Mühendislik Dergisi Pub Date : 2022-12-10 DOI: 10.24012/dumf.1184570

Selman Oğraş, Fevzi Önen

{"title":"Barajların deşarj yapılarındaki akış karakteristikleri ve enerji kırıcı yapıların etkinliğinin sayısal analizi","authors":"Selman Oğraş, Fevzi Önen","doi":"10.24012/dumf.1184570","DOIUrl":"https://doi.org/10.24012/dumf.1184570","url":null,"abstract":"Su gücü(Hydropower) endüstrisinde su kaynaklarının gelişimi bakımından son 60 yılda özellikle son 30 yılda büyük ilerleme ve yenilikler ortaya çıkmış, buna paralel dünyada büyük hidroelektrik projeler inşa edilmiştir. Hidroelektrik güç üretilen büyük ve kompleks yapıların karakteristikleri başlıca; baraj tasarım yükü yüksekliği, büyük deşarj, birim genişlikteki deşarj kapasitesi ve karmaşık jeolojik koşullardır. Üretilen güç miktarı onlarca veya yüzlerce gigawatt kadar yüksek olabilen bu derece yüksek güç üreten potansiyel enerjiyi dağıtmak, sönümlemek baraj mühendisliğinin elbette zor olan konularındandır. Dolayısıyla baraj mühendisliğinin araştırma konularından olan barajların deşarj yapılarının hidrolik karakteristikleri ve ortaya çıkan enerjinin güvenli ve ekonomik olarak dağıtımının sağlanması hususu dikkate alındığında etkin bir proje tasarımı için yapılacak fiziksel modelleme, prototip deneyleri ve sayısal modelleme sonuçlarının birlikte değerlendirilmesi gerekmektedir. Bu çalışmada yapılan fiziksel model çalışmalarıyla belirlenen deşarj yapılarındaki hidrolik karakteristikler ve enerji kırıcı yapıların etkinliği Hesaplamalı Akışkanlar Dinamiği (HAD) yöntemi ile sayısal olarak incelenmiştir. Çalışmanın sayısal modellemesinde özellikle açık kanal akımı, sediment taşınımı, oyulma gibi problemlerin çözümünde başarılı bir yazılım olan Flow3D kullanılmış olup sayısal hesaplamalardan elde edilen su yüzü, basınç değerleri ve hız profilleri model ölçeğiyle (1/100) yapılan fiziksel model deney ölçümleriyle karşılaştırılmıştır.","PeriodicalId":158576,"journal":{"name":"DÜMF Mühendislik Dergisi","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124669403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Automated Detection of Alzheimer’s Disease using raw EEG time series via. DWT-CNN model 基于原始脑电图时间序列的阿尔茨海默病自动检测。DWT-CNN模型

DÜMF Mühendislik Dergisi Pub Date : 2022-12-05 DOI: 10.24012/dumf.1197722

Mesut Seker, M. S. Özerdem

{"title":"Automated Detection of Alzheimer’s Disease using raw EEG time series via. DWT-CNN model","authors":"Mesut Seker, M. S. Özerdem","doi":"10.24012/dumf.1197722","DOIUrl":"https://doi.org/10.24012/dumf.1197722","url":null,"abstract":"Dementia is an age-related neurological disease and gives rise to profound cognitive decline in patients’ life. Alzheimer’s Disease (AD) is the progression of dementia and AD patients generally have memory loss and behavioral disorders. It is possible to determine the stage of dementia by developing automated systems via. signals obtained from patients. EEG is a popular brain monitoring system due to its cost effective, non-invasive implementation, and higher time resolution. In current study, we include participants of 24 HC (12 eyes open (EO), 12 eyes closed (EC)), and 24 AD (HC (12 eyes open (EO), 12 eyes closed (EC)). The aim of current study is to design a practical AD detection tool for AD/HC participants with a model called DWT-CNN. We performed Discrete Wavelet Transform (DWT) to extract EEG sub-bands. A Conv2D architecture is applied to raw samples of related EEG sub-bands. According to obtained performance metrics calculated from confusion matrices, all AD and HC time series are correctly classified for alpha band and full band range under both EO and EC. Classification rate of AD vs. HC increases under EO state in all cases even if EC is commonly preferred in other studies. We will add MCI patients with equal size and similar demographics and repeat the experimental steps to develop early alert system in future studies. Adding more participants will also increase generalization ability of method. It is also promising study to combine EEG with different modalities (2D TF image conversion, or MRI) in a multimodal approach.","PeriodicalId":158576,"journal":{"name":"DÜMF Mühendislik Dergisi","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127898998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1