TR-Dizin İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/8652

Browse

Now showing 1 - 20 of 59

Citation - WoS: 2
Citation - Scopus: 2
Analysis of Heat Transfer Enhancement in Tubes With Capsule Dimpled Surfaces and Al2o3-Water Nanofluid
(Turkish Soc thermal Sciences Technology, 2022) Ibrahim, Mahmoud Awni A. Haj; Turkoglu, Hasmet; Yapici, Ekin Ozgirgin
This study aims to numerically investigate and evaluate the enhancement of heat transfer by new capsule dimples on tube surfaces for flow of water and Al2O3-water nanofluid with different concentrations, under uniform surface heat flux. The originality of this work lies in combining two passive heat transfer enhancement methods such as geometrical improvements and nanofluids together. Capsule dimples with different depths were considered. Al2O3- water nanofluid was modeled as a single-phase flow based on the mixture properties. The effects of dimple depth and nanoparticle concentrations on Nusselt number, friction factor and performance evaluation criteria (PEC) were studied. Numerical computations were performed using ANSYS Fluent commercial software for 2000-14000 Reynolds number range. It was found that when laminar, transient and fully developed turbulent flow cases are considered, increase in the dimple depth increases the Nusselt number and friction factor for both pure water and Al2O3-water nanofluids cases. Also, the friction factor increases as dimple depth increases. Results show that increase in PEC is more pronounced in the laminar region than in the transition region, it starts to decrease for turbulent flows. For nanofluid, PEC values are considerably higher than pure water cases. The variation of PEC for capsule dimpled tubes are dependent on flow regimes and dimple depths. Increasing the nano particle volume concentration and dimple depth in laminar flows increase the PEC significantly.
An Autobiography of Hilmi Çelik
(2007) Dener, Hasan Işın
Citation - Scopus: 6
The Comparison of Performance of Electrolytic Cu and Cube Tool Electrodes in Electric Discharge Machining of Ti6al4v Alloy
(TUBITAK, 2021) Bozkurt, F.; Özerkan, H.B.; Çoğun, C.; Uslan, İ.; Urtekin, L.
The most crucial cost element of Electric Discharge Machining (EDM) is the production of tool electrode (shortly electrode). Copper, its alloys, and graphite are the most commonly used electrode materials. Selecting the proper electrode material with low production and material cost, high workpiece material removal rate (MRR) and low tool electrode wear rate (TWR) is key to reducing machining costs with EDM. In this study, the EDM performance of CuBe tool electrodes in the machining of Ti6Al4V alloy was experimentally investigated in comparison to electrolytic Cu (E-Cu) electrodes for different pulse time (ts) and discharge current (I) settings. An increase in MRR and a decrease in TWR and relative wear (RW=TWR/MRR) were observed in machining with CuBe electrodes. However, the high raw material cost of CuBe alloy is an essential drawback in widely using these electrodes in industrial applications. A new performance index formulation is introduced for EDM applications that factor in the production cost of the electrode and its life (i.e., RW). According to our results, the CuBe could be used advantageously as the electrode material at medium current settings. However, at low and high current settings, the low raw material cost of E-Cu makes it more favorable. © 2021, TUBITAK. All rights reserved.
Citation - Scopus: 3
Decision Analysis on Criteria That Affect Design of Reverse Logistic Systems in Textile Sector
(Chamber of Textile Engineers, 2018) Güzel, B.; Taş, A.
In this study, reverse logistics implementation is examined in terms of the textile industry. This study examines textile recycling activities and textile wastes that are used in these activities and it also contains information and suggestions on the situation of textile wastes that are not used in recycling activities. The analysis chapter of this study determines the criteria which affect the decisions and activities of companies that carry out textile recycling. The sectoral order of the importance of these criteria, which have been determined as a result of literary research and expert opinions, was maintained by using AHP and DEMATEL multi-criteria decision making techniques. The study also examines the measurements affecting the decisions and activities of companies working in the textile recycling industry and it contains the order of the importance of these measurements, analyzed by using AHP and DEMATEL multi-criteria decision making methods. © 2012.
Citation - WoS: 3
Citation - Scopus: 4
Demans Hastalarında Ajitasyonun Bakım Veren Yüküne Etkisi
(Gunes Kitabevi Ltd Sti, 2014) Altunöz, Umut; Baştu, Gülbahar; Ozel Kızıl, Erguvan Tugba; Altıntaş, H Özge; Çelik, Nazlı Durmaz
Giriş: Bu çalışmanın amacı demans hastalarına bakım veren yakınlarında ajitasyonun öznelbakım veren yüküne etkisinin depresif belirtiler, bilişsel işlevler, demans süresi, bakım verenin yaşı, eğitimi, cinsiyeti gibi diğer etmenlerle birlikte araştırılmasıdır. Gereç ve Yöntem: Araştırmaya toplam 49 demans hastası (Ort. yaş: 76.5; Ss: 5.6) ve 49 bakım vereni katılmıştır. Verilerin toplanmasında, hastalara Standardize Mini Mental Test ve CornellDemansta Depresyon Ölçeği, bakım verenlere ise Cohen-Mansfield Ajitasyon Envanteri, Bilişsel Kayıp için Bilgilendiriciye Uygulanan Anket ve Zarit Bakıcı Yükü Ölçeği uygulanmıştır. Bulgular: Bakım verenin cinsiyeti ve yakınlık türü ile Zarit Bakıcı Yükü Ölçeği puanları açısından istatistiksel olarak anlamlı fark bulunmadığı gibi Standardize Mini Mental Test ve Cornell Demansta Depresyon Ölçeği puanları, bakım verenin eğitim süresi, hastanın yaşı, eğitim süresi vehastalık süresi ile de anlamlı korelasyon bulunmamıştır. Zarit Bakıcı Yükü Ölçeği ile Cohen-Mansfield Ajitasyon Envanteri puanı, bakım veren yaşı ve Bilişsel Kayıp için Bilgilendiriciye UygulananAnket puanı arasında anlamlı korelasyon saptanmıştır. Lineer regresyon analizinde ise bakıcı yükünün yalnızca ajitasyon puanı ile ilişkili olduğu bulunmuştur. Sonuç: Bu çalışmada elde edilen sonuçlar demans hastalarında Cohen-Mansfield AjitasyonEnvanteri ile değerlendirilen ajitasyon sıklığının öznel bakım veren yükünü belirleyen temel faktörolduğuna işaret etmektedir. Bakım verme işinin kolaylaştırılması için psikofarmakolojik tedavilerinyanı sıra bakım verenlere yönelik psikososyal girişimler de etkili olmaktadır. Ülkemizde ajitasyonayönelik müdahaleler içeren evde ve gündüz bakım hizmetlerinin, bakım verenlere yönelik psikososyal destek ve bilgilendirme programlarının yaygınlaştırılması gereklidir.
Demans Hastalarında Cohen-Mansfield Ajitasyon Envanteri’nin Türkçe Uyarlamasının Psikometrik Özellikleri
(2012) Çelik, Nazlı Durmaz; Sakarya, Direnç; Özel, E. Tuğba Kızıl; Erdoğan, Şeyda; Bastug, Gülbahar
Giriş: Cohen-Mansfield Ajitasyon Envanteri (CMAE) demans hastalarında ajitasyon şiddetinin değerlendirilmesinde yaygın olarak kullanılan bir araçtır. Demansa eşlik eden davranışsal belirtilerin şiddetinin ve tedaviye yanıtın araştırıldığı çalışmalarda kullanılmaktadır. Bu çalışmada, demans hastalarında (n=52) CMAE’nin Türkçe uyarlamasının psikometrik özelliklerinin araştırılması amaçlanmı ştır. Gereç ve Yöntem: CMAE Geriatrik Psikiyatri polikliniğine yakını ile beraber başvuran demans hastalarının bakım veren yakınlarına yüz yüze görüşme ile uygulanmıştır. Ölçeğin geçerliği için CMAE toplam puanı ile Nöropsikiyatri Envanteri (NPE) toplam puanı ve alt ölçek puanları arasındaki korelasyon değerlendirilmiştir. Ölçeğin iç tutarlılığı için Cronbach alfa değeri hesaplanmıştır. Bulgular: CMAE puanının NPE puanı ile anlamlı düzeyde pozitif korelasyon gösterdiği ve ölçeğ in iç tutarlılığının yüksek (0.89) olduğu saptanmıştır. Sonuç: CMAE’nin Türkçe uyarlaması demans hastalarında ajitasyon davranışlarının sıklığını ve şiddetini belirlemede kullanılabilecek geçerli ve güvenilir bir araçtır. İleride yapılacak çalışmalarda yatan demans hastalarında ölçeğin değerlendiriciler-arası güvenirliğinin değerlendirilmesi önerilmektedir.
Citation - Scopus: 1
Determination of Attitudes of Healthcare Personnel Working in Surgical Services Towards the Use of Gloves
(2018) Uzuntarla, Fatma; Uzuntarla, Yasin; Urkan, Murat
Aims: This study aimed to determine the attitudes of healthcare personnelworking in surgical services towards the use of gloves and whetherthese attitudes differ according to sociodemographic characteristics.Methods: This was a descriptive study conducted on healthcare personnelworking in the surgical services of a training and research hospital. The‘’Attitude Scale for the Use of Gloves-ASUG’’ was used to collect data.Results: A total of 347 healthcare personnel participated in the study. Of the participants,56.2% were female, 61.7% were married, 43.8% were under the age of 30, 66.9% wereuniversity graduates, 42.9% were nurses, and 44.7% had professional experience ofover 11 years. Mean ASUG score was 44.55 ± 5.59. We detected significant differencesin glove use according to participants’ gender, education level and occupation (p<0.05).Conclusions: Attitudes of healthcare personnel towards the use of gloves were foundpositive in this study. Training on the use of gloves should be prioritized for healthcarepersonnel, especially for the health technicians and fellows.
Diffraction of Waves by a Wedge With Phase Conjugate Faces
(2011) Umul, Yusuf Ziya
The scattering process of waves by a wedge with phase conjugate faces is investigated with the aid of the modified diffraction theory of Kirchhoff. The scattering integral is evaluated asymptotically. The uniform diffracted waves and geometrical optics fields are plotted and examined numerically.
Direct and Indirect Relationships Between Cognitive Flexibility and Covid-19 Related Psychological Distress: the Mediating Role of Maladaptive Cognitive Emotion Regulation Strategies
(Klinik Psikiyatri dergisi, 2022) Sayinta, Senanur; Kocak, Hatice Nur; Kaynak, Hande
Objective: The effects of the COVID-19 pandemic are remarkable on individuals' mental health. During the COVID-19 pandemic, there is an increase in mental health problems and psychological distress in uninfected healthy people. The present study aimed to examine the mediator role of maladaptive cognitive emotion regula-tion strategies in the relationship between cognitive fle-xibility and COVID-19 related psychological distress experienced during the current pandemic. Method: The sample consisted of 351 young adults (86% female and 14% male) who were not infected with COVID-19 aged between 18 to 25 years old. Participants completed the self-report questionnaires, including the Cognitive Flexibility Inventory, Cognitive Emotion Regulation Questionnaire, and COVID-19 Related Psychological Distress Scale. Mediation analysis estimated total, indi-rect, and direct effects between cognitive flexibility and COVID-19 related psychological distress. Results: The correlation analyses showed that cognitive flexibility -control dimension was negatively associated with both COVID-19 related psychological distress and maladaptive cognitive emotion regulation strategies. Also, maladap-tive cognitive emotion regulation strategies and COVID-19 related psychological distress was found to be posi-tively correlated. In the study sample, the results of the bootstrap mediation indicated that maladaptive cogni-tive emotion regulation strategies, including self-blame, acceptance, rumination, catastrophizing, and blaming others, fully mediated the relationship between cogni-tive flexibility -control and COVID-19 related psycholog-ical distress. Discussion: Our findings would help psy-chological interventions designed for COVID-19 unin-fected healthy people who have lower-level cognitive flexibility -control dimension by highlighting the promi-nence that the fewer people use maladaptive cognitive emotion regulation strategies, the less they feel COVID-19 related psychological distress.
Do Depreciations Really Trigger an Inflow of Foreign Direct Investment? the Case of Turkey
(Sosyoekonomi Soc, 2018) Erunlu, Zeynep
In this study, the relationship between real exchange rate and foreign direct investment is examined using the Logistic Smooth Transition - Autoregressive Distributed Lag (LST-ARDL) model. Analyzing the effect of real exchange rate changes on foreign direct investment is very crucial for a developing country like Turkey which has a relatively large foreign debt stock. The estimation results show that foreign direct investment inflows to Turkey increase when Turkish Lira appreciates against the US dollar and this effect is especially strong during periods of high investment inflows. Thus, for Turkey to attract productive capital flows rather than unstable short-term portfolio flows it has to maintain a strong currency against the US dollar.
Düşünce Özgürlüğü ve Kütüphaneler: Nicel bir İnceleme
(2010) Darvısh, Hamid
Birleşmiş Milletler tarafından 1948 yılında yayınlanan İnsan Hakları Bildirgesinin en önemli bölümlerinden bir tanesi kişilere her şartta bilgi arama ve bilgi edinme hakkı tanınmasıdır. Bu açıdan, kütüphanelerin kişilerin bilgiye ulaşması noktasında ciddi görevleri ve sorumlulukları bulunmaktadır. Kütüphanelerin kullanımına ilişkin Haklar Bildirgesine (Library Bill of Rights) göre “kütüphaneler bilgilenme ve aydınlanmaya ilişkin fonksiyonlarını ifa ederken yasakçı zihniyet ile mücadele etmelidirler”. Bu çalışmanın temel sorusu; kütüphaneler fikri haklar ve bilgiye erişim hakkı noktasında nasıl bir rol üstlenmelidirler? Çalışmada kütüphaneler ile fikri haklar konusunda pozitif bir ilişkinin bulunduğu savunulmaktadır.
Effects of Communication Competency and Self-Esteem on Gaming Addiction Symptoms
(2022) Topcu-bulut, Merve; Şaliş, İrem
Gaming behavior has become more and more popular, but there has not been any research that considers the relationship between communication competency, self-esteem, and internet gaming addiction symptoms. The main aim of the ongoing study was to assess the associations between internet gaming addiction symp- toms, self-esteem, and dimensions of communication competency. For this purpose, data were obtained from 455 individuals (47.7% females and 52.3% males) who reported that they are involved in gaming. In this study, participants were assessed with the following scale set: Sociodemographic Form, Internet Gaming Disorder Scale-Short Form, Communicative Competence Scale, and Rosenberg Self-Esteem Scale. Analyses indicated that the internet gaming disorder total score has a significant and negative correlation with self- esteem and dimensions of communication competency. Besides these results, self-esteem and listening com- petency of dimensions of communication competency have been found as a significant predictor of internet gaming disorder total score. In the literature, there has been only finite published research analyzing the dimensions of communication competency, self-esteem, and internet gaming disorder.
An Empirical Survey of Consumer Ethnocentrism in Kazakhstan and the Preference of Consumers on Imported Products
(2017) Nakip, Mahir; Gökmen, Aytaç
Küreselleşme gerçeği uluslararası işletmecilik ve uluslararası ticaret önündeki engelleri azaltmakta ve de tüketici istek ve beklentilerinin dünya çapında karşılanmasını sağlamaktadır. Tüketici istek ve beklentilerinin küresel ölçekte bütünleşmesi ise uluslararası pazarda faaliyette bulunan işletmelerin işlerini kolaylaştırmaktadır. Ancak, bu konu her ülke ve bölgede aynı biçimde gerçekleşmemektedir. Tüketici etnosentrizmi ise millî duygular, gurur, ve ürünlerin geri çevrilmesini içeren, herhangi bir rasyoneli olmayan ve de millî duyguları vurgulayan önemli bir engel olarak uluslararası işletmelerin önüne çıkar. Dolayısı ile, bu çalışmanın amacı Orta Asya Türk Cumhuriyetleri’nden Kazakistan’da tüketici etnosentrizmini incelemektir. Sonuçlar etnosentrik algı ile ürün gereksinimi arasında güçlü bir korelasyon olmadığını göstermektedir. Ayrıca, etnosentrizm alt boyutları ithal ürünler ile ilgili olarak değişik korelasyon seviyelerine sahiptir. Ek olarak, ithal ürünlerdeki sapmayı açıklamada din ve ahlaki değerler etkin faktörler değildirler.
Enformasyon Yönetimi Sistemi Tasarımının Üretim Yapan İşletmelerde Faaliyet Temelli Maliyet Muhasebesi için Önemi
(2012) Satır, Benhür
Ürün maliyetlerinin gerçek değerlerine yakın tahmini, ürün kârlılıkları ve işletmelerin pazarda rekabetçi olabilmeleri için çok önemlidir. İşletme bir üretim işletmesi ise, özellikle siparişe dayalı üretim yapıyor veya çok çeşitli tipte ürün üretiyorsa maliyet tahmini zorlaşmaktadır. Bunlara ek olarak, üretim koşulları zorlu bir işletme ise, ürün maliyeti için üretim sürecinden gelmesi gereken üretim enformasyonunun sağlıklı olması zorlaşmakta ve işletme için maliyet tahmini gerçek değerinden oldukça farklı olabilmektedir. Bazı ürünler için üretim ve teslimat süreci bittikten sonra, tahmini maliyete göre kâr beklenirken, gerçekleşen maliyetin fiyattan bile yüksek çıktığı ve aslında bu üretimden zarar edildiği çok geç olarak anlaşılabilmektedir. Bütün bu zorluklar aşılarak doğru bir maliyet tahmini yapılması için, enformasyon yönetim sisteminin maliyet muhasebesi sistemine uygun tasarlanmasının yanı sıra, sistemin sağlıklı ve güncel tutulması gerekmektedir. Bu çalışmada üretim koşullarının en zor olduğu işletmelerden birisi olan dökümhâneler için Faaliyet Temelli Maliyetlendirme Yöntemi uygulamaları esas alınarak, Enformasyon Yönetimi Sisteminin buna uygun nasıl tasarlanması gerektiği anlatılmıştır.
Citation - Scopus: 3
Evaluating Effectiveness of Led and Oled Lights on User Visual Comfort and Reading Performance
(Istanbul Teknik Universitesi, Faculty of Architecture, 2021) Avci, A.N.; Memikoğlu, İ.
In interior architecture, one of the main purposes of light is to create comfortable and functional spaces according to user needs. Light provides individuals to understand, get information for visual tasks and it affects how they experience and behave in the environment. Desired illuminance levels are required for visual comfort and task efficiency. This study analyzes the effects of different illuminance levels of light emitting diode (LED) and organic light emitting diodie (OLED) lights on user visual comfort and reading performance. An experiment was con-ducted with eighty interior architecture students at Çankaya University. Six lighting scenarios were created with LED and OLED lighting sources that assessed six visual comfort criteria. The experimental setting consisted of three different illuminance levels, as 200, 500 and 800 lx. The results revealed that different illuminance levels were found more comfortable for different visual comfort criteria, but the illuminance level of 500 lx was visually more comfortable than the other illuminance levels. The illuminance level of LED 200 lx was visually more comfortable than LED 800 lx. OLED light was found visually more comfortable than LED light. In addition, participants read slower under the illuminance level of LED 200 lx. It was concluded that illuminance levels of light effect user’s visual comfort and reading performance. This study provides a basis to recommend the preferred illuminance level for LED and OLED light during a reading performance. © 2021, Istanbul Teknik Universitesi, Faculty of Architecture. All rights reserved.
The Ever-Evolving Dark Side Emotions of the Football Supporters: A Study on Adaptation of Schadenfreude Scale
(Pamukkale University, 2025) Şener, İrge; Karapolatgil, Ahmet Anıl
Enjoying from others’ maleficence, defined as schadenfreude, is a common emotion among football team supporters. Based on the social identity of supporters, schadenfreude develops as part of the rivalry, which the main sources of it are ‘similarity’, ‘repeated competition’, and ‘competitiveness’. This study is aimed to understand and classify supporters’ schadenfreude reasons based on an adapted scale. For this aim, the data gathered from a questionnaire consisting of a sample of 1.163 supporters of 14 Turkish football teams is examined by SPSS in order to reveal participants’ schadenfreude and their reasons for evaluating their rivals. As a result of participants’ rivalry classifications, the most common reasons for considering a team as a rival are determined respectively as ‘image’, ‘neighborhood’, and ‘worldview difference’. Moreover, schadenfreude is mostly felt towards the archrival, and supporters would be happiest with negativities experienced by the rival team’s managers. However, damage to rival team facilities is found as an unhappy situation. The study is the first that demonstrates the relationship between schadenfreude and rivalry and proposes ‘unique incident’ and ‘feasible contingencies’ as new rivalry factors. With these factors, different perspectives on the formation and continuity of rivalry are presented.
Citation - Scopus: 5
Examining the Influence of Autonomous Vehicle Behaviors on Travel Times and Vehicle Arrivals: a Comparative Study Across Different Simulation Durations on the Kirkuk-Sulaymaniyah Highway
(Society of Automotive Engineers Turkey, 2024) Albdairi, M.; Almusawi, A.
This study delves into the effects of autonomous vehicle behaviors on travel times and vehicle arrivals along the Kirkuk-Sulaymaniyah Highway, employing simulations spanning 3600, 5400, and 7200 seconds. Across varied traffic volumes ranging from 350 to 950 vehicles and autonomous vehicle behaviors categorized as cautious, normal, aggressive, aggressive platoons, and a mix alongside human-driven vehicles, the research unveils significant findings. Results highlight substantial reductions in average travel times and heightened vehicle arrivals among autonomous vehicles, particularly those exhibiting aggressive behaviors, compared to their human-driven counterparts. Across all simulation scenarios, aggressive autonomous vehicles consistently demonstrate superior performance, showcasing potential efficiency gains through aggressive driving algorithms. Furthermore, with increasing traffic volume, the advantages of aggressive autonomous behaviors become more pronounced, suggesting their adaptability to congested conditions. However, safety implications and traffic flow dynamics warrant caution, especially in scenarios with high volumes and aggressive behaviors. These insights underscore the importance of further research and policy considerations to leverage the full potential of autonomous vehicles while ensuring safely and efficiency on highways. © 2024 Society of Automotive Engineers Turkey. All rights reserved.
Citation - WoS: 4
Citation - Scopus: 7
The Gamification Tool for the Classroom Response Systems: Kahoot
(Hacettepe Univ, 2020) Akkoyunlu, Buket; Gunduz, Abdullah Yasin
Classroom response systems (CRS), which are used to gather immediate feedback from students throughout the teaching process, have been called by different names in the past and present. Examples of CRS implementations include question-answer systems, student response systems, electronic response systems, or cloud-based classroom response systems. The objective of this study is to inform educators who embrace flipped learning about students' perceptions of the use of Kahoot. This study employed a mixed-method research approach with 53 sophomore students. Both quantitative and qualitative data about Kahoot activity were gathered at the end of a 9-week flipped learning implementation process. At the end of the study, the students stated that a CRS may be used within the scope of any lesson. Students also underlined that the use of CRS in learning environments could be an efficient way to increase motivation for the lesson and create an enjoyable learning environment. Therefore, teachers may be advised to use CRS when deciding on classroom activities in flipped learning.
İmer, Kamile ve Gürkan Ddoğan (2006). Current Researchs In Turkish Lingustics. Gazimağusa: Doğu Akdeniz Üniversitesi Yayınları. 268 Sayfa
(2007) Doğan, Gürkan
Industry 4.0 Readiness of Smes: Active Participants or Silent Audience of the Revolution
(Sosyoekonomi Soc, 2023) Sener, Irge; Karapolatgil, Ahmet Anil
Nowadays, the technological consequences of the Fourth Industrial Revolution affect all organisations. However, the current reactions of SMEs have yet to be explored. For this reason, this study focused on the actual status of SMEs and aimed to determine their readiness and awareness of Industry 4.0 technologies. Semi-structured interviews were conducted with 44 SME managers operating in Ankara, constituting the study sample. Research findings were examined within the scope of 3 main themes determined by content analysis. In this context, it has been concluded that SMEs in the sample have low awareness of Industry 4.0, and their readiness needs to be improved.

Browse

Browsing TR-Dizin İndeksli Yayınlar Koleksiyonu by Scopus Q "Q4"