Adsorption and absorption of Boron, Nitrogen, Aluminium and Phosphorus on Silicene: stability, electronic and phonon properties

Ab initio calculations within the density-functional theory formalism are performed to investigate the chemical functionalization of a graphene-like monolayer of silicon - silicene - with B, N, Al or P atoms. The structural, electronic, magnetic and vibrational properties are reported. The most preferable adsorption sites are found to be valley, bridge, valley and hill site for B, N, Al and P adatoms, respectively. All the relaxed systems with adsorbed/substituted atoms exhibit metallic behaviour with strongly bonded B, N, Al, and P atoms accompanied by an appreciable electron transfer from silicene to the B, N and P adatom/substituent. The Al atoms exhibit opposite charge transfer, with n-type doping of silicene and weaker bonding. The adatoms/substituents induce characteristic branches in the phonon spectrum of silicene, which can be probed by Raman measurements. Using molecular dynamics we found that the systems under study are stable up to at least T = 500 K. Our results demonstrate that silicene has a very reactive and functionalizable surface.Comment: 9 pages, 5 figure

ANALYSING MORAL BEHAVIOURS OF SECONDARY SCHOOL STUDENTS WHO ARE DOING SPORTS OR NOT

The purpose of this research was to determine the moral behaviour in terms of some variables of the students who are participating in school sports or not. In this research participated in totally 191 students, all of them having education at different educational situation in Burdur city centre. ‘’Sportmanship Scale for Physical Education Lesson’’ developed by KOC.SPSS 22.0 and Mplus 7.0 Windows programmes were used in statistical analysis of data obtained from research. In the end of the research, independent samples T-test was applied for students’ morally behavior, for the sports games in order to know whether there are differences by gender or not. According to the analysis result, there are no differences between male and female students’ moral conduct score. For understanding the effects of age groups of the students, 6th, 7th and 8th grades were compared using ‘’Analysis of Variance’’ (ANOVA). This comparison results showed meaningful differentiation for age groups of the students’ moral behaviour in sports games. At the same time students who attended both physical education lesson and school competitions had a significant difference in scores of appropriate behaviour. As a result, students who participate in competitions have more appropriate behaviour score than the ones which only participate in physical education lessons.  Article visualizations

Pre-service Physics Teachers’ Opinions about the Difficulties in Understanding Introductory Quantum Physics Topics

The aim of this study is to identify the opinions of pre-service physics teachers about the difficulties in introductory quantum physics topics. In this study conducted with twenty-five pre-service physics teachers, the case study method was used. The participants were interviewed about introductory quantum physics topics. The interviews were coded using content analysis and were divided into different categories. In this way, we tried to reveal the opinions of pre-service physics teachers about the difficulties of these topics. In conclusion, it can be said that the participants had the most difficulty in transition from classical physics to quantum physics. This is especially evident in quantum physics topics that require a different understanding such as black body radiation, wave-particle structure of light and the uncertainty principle. It was also found that the participants had no difficulties in terms of mathematical calculations, and that approaches based on visualizing the topic were received positively

Stability, electronic and phononic properties of β and 1T structures of SiTex (x = 1, 2) and their vertical heterostructures

By performing first-principles calculations, we predict a novel, stable single layer phase of silicon ditelluride, 1T-SiTe2, and its possible vertical heterostructures with single layer β-SiTe. Structural optimization and phonon calculations reveal that 1T-SiTe2 structure has a dynamically stable ground state. Further analysis of the vibrational spectrum at the - point shows that single layer 1T-SiTe2 has characteristic phonon modes at 80, 149, 191 and 294 cm-1. Electronic-band structure demonstrates that 1T-SiTe2 phase exhibits a nonmagnetic metallic ground state with a negligible intrinsic spinorbit splitting. Moreover, it is shown that similar structural parameters of 1T-SiTe2 and existing β-SiTe phases allows construction of 1T-β heterostructures with a negligible lattice mismatch. In this regard, it is found that two energetically favorable stacking orders, namely AA and ATB, have distinctive shear and layer breathing phonon modes. It is important to note that the combination of semiconducting β-SiTe and metallic 1T-SiTe2 building blocks forms ultra-thin Schottky barriers that can be used in nanoscale optoelectronic device technologies.TUBITAK (116C073--114F397); The Science Academy, Turkey under the BAGEP progra

STRATEGIC MANAGEMENT PROCESS AT FURNITURE FIRMS

Strategic management is a sum of processes that aims to maintain firm’s life at long-term, to get sustainable competitive advantage and to gain profit over sector average. Generally, there is an apparent expansion of management’s planning, organizing, leading and controlling functions in this process. The firms that use strategic management process efficiently and effectively will continue their operations easier in present-day business world that becomes more global and competitive each passing day.In this study, it is searched that how and in which level firms of furniture industry practice strategic management process. A survey is applied to 30 furniture firms that operate in Mersin province with face-to-face method. By using descriptive statistics, variance and correlation analyses at SPSS environment, inferences are made from the data obtained from firms. As a result, it is found that firms agree with 14 factors, used for researching strategic management process of firms, in proportion as 97,4%. This result shows that furniture firms have strategic management conscious

SOME CONDITIONS ON STARLIKE AND CLOSE TO CONVEX FUNCTIONS

Many mathematical concepts are explained when viewed through complex function theory. We are here basically concerned with the form f(z) = a(0) + a(1)z + a(2)z(2) +.... f(z) is an element of A, f(z) = z + Sigma(infinity)(n=2)a(n)z(n) will be an analytic function in the open unit disc U = {z : |z| < 1,z is an element of C} normalized by f(0) = 0, f '(0) = 1. In this work, starlike functions and close-to-convex functions with order 1/4 have been studied according to the exact analytic requirements

Tedarik zincirinde bilgi paylaşımının işletme performansına etkileri

06.03.2018 tarihli ve 30352 sayılı Resmi Gazetede yayımlanan “Yükseköğretim Kanunu İle Bazı Kanun Ve Kanun Hükmünde Kararnamelerde Değişiklik Yapılması Hakkında Kanun” ile 18.06.2018 tarihli “Lisansüstü Tezlerin Elektronik Ortamda Toplanması, Düzenlenmesi ve Erişime Açılmasına İlişkin Yönerge” gereğince tam metin erişime açılmıştır.Günümüz küresel ekonomisinde hayatta kalmak ve yarışmak için, imalat sektörü üretmeye, paylaşmaya, günümüze yaymaya ve uygun bilgi ve bilişime şiddetle ihtiyaç duymaktadır. Artık organizasyonlar arasındaki farklılığı belirleyen en önemli faktör bilgi akışıdır. Tedarik Zinciri Yönetimi (TZY) firmaların performansları açısından önem kazanmıştır. Tedarik zinciri (TZ) içerisinde, karşılıklı güven olgusu geliştirilerek, doğru ve kaliteli bilginin paylaşılması, böylece esnek ve çevik firma yapılarına ulaşılması zincirin performansını olumlu yönde etkileyecektir. Bu sayede, daha esnek ve çevik firma yapıları, sürekli değişen ve gittikçe belirsiz bir hal alan müşteri ihtiyaçlarına daha hızlı cevap verecektir. TZY performansının artması firma performansını artırmaktadır. Performansın ölçülmesi, bir faaliyetin etkinliğini ve verimliliğini ölçme süreci olarak tanımlanabilir. Performans ölçümü ve bu değişkenler, faaliyetlerin gelecekteki konumunun belirlenmesi, performansının değerlendirilmesi ve amaçların ortaya konulabilmesi için aktif bir rol oynamaktadır. Dolayısıyla tedarik zincirinde bilgi paylaşımının performans ölçüm ve değerlendirme kriterlerinin doğru belirlenmesi, tedarik zinciri üyelerinin tamamını ve tedarikçilerle başlayan ve son kullanıcılarla son bulan sürecin içerisinde bütün paydaşları ilgilendirmektedir. Tedarik zinciri süreci ve bilgi paylaşımı günümüz tedarik zincirinde kritik rol oynamaktadır. TZY'nde önceki araştırmalar, çeşitli tedarik zinciri süreçlerini ve bilgi paylaşımının farklı yönleri ayrı ayrı incelenmiştir. Bu nedenle, bu çalışma tedarik zinciri süreci, bilgi paylaşımı, tedarik zinciri esnekliği, çevresel belirsizlikler ve işletme performansı arasındaki ilişkileri incelemek için kapsamlı bir çerçeve önermektedir. Bu çalışma ile tedarik zinciri sürecinde bilgi paylaşımının işletme performansına etkilerinin değerlendirilmesine ilişkin değişkenler belirlenmiştir. Ayrıca işletme performansının değerlendirilmesine yönelik Yapısal Eşitlik Modeli (YEM) ve Yapay Sinir Ağı (YSA) şeklinde iki aşamalı yöntem kullanılmıştır. Çalışmamızda, işletme performans ölçüleri olarak maliyet, esneklik, cevap verme, teslimat ve finansal performans şeklinde 5 farklı model oluşturulmuştur. Elde edilen modeller önce YEM ile test edilmiş ve YEM'den elde edilen veriler YSA için girdi olarak alınıp Matlab programı kullanılarak YSA modelleri gizli değişkenler arası ilişkileri daha güçlü şekilde tahmin ettiği görülmüştür.The manufacturing sector heavily needs producing, sharing, bringing to the present, appropriate information and informatics in order to survive and compete in today's global economy. Now, the most important factor determining the difference between organizations is the information flow. Supply Chain Management (SCM) has gained significance in terms of company performances. Within the supply chain (SC), sharing correct and quality information, and thus, achieving flexible and agile company structures by developing the phenomenon of mutual trust will affect the performance of the chain positively. In this way, more flexible and agile company structures will enable responding to customer needs, which are continuously changing and gradually becoming unclear, more quickly. An increase in the SCM performance enhancees the company performance. The measurement of the performance can be defined as the measuring process of the efficiency and productivity of an activity. Performance measurement and these variables play an active role in determining the future position of activities, evaluating the performance and setting the objectives. Therefore, the accurate determination of the performance measurement and evaluation criteria of information sharing in the supply chain interests all the members of the supply chain and all the shareholders within the process which begins with suppliers and ends with end-users. The supply chain process and information sharing play a critical role in the supply chain nowadays. Previous studies on SCM investigated various supply chain processes and different aspects of information sharing separately. Therefore, an extensive framework is suggested this time to examine the relationships between the supply chain process, information sharing, supply chain flexibility, environmental uncertainties and business performance. In this study, variables have been determined regarding the evaluation of the effects of information sharing on business performance in the supply chain process. Moreover, a two-stage method was used for the evaluation of business performance as the Structural Equation Model (SEM) and the Artificial Neural Network (ANN). In the present study, 5 different models were established as the business performance measures: cost, flexibility, responding, delivery and financial performance. The models obtained were first tested with SEM, and the data obtained from SEM were taken as input for the ANN, and it was then observed by using the Matlab software that the ANN models estimated the relationships between the latent variables more strongl

Poisson Regresyon Uygulaması: Türkiye'deki Grevlerin Belirleyicileri 1964 - 1998

This study applies a Poisson regression model to annual Turkish strikes data of the period of 1964-1998. The Poisson regression model is preferable when the dependent variable is count data. Economical and social variables are used as determinants of the number of strikes. Empirical results show that the unemployment rate and a dummy variable that takes 0 before 1980 1 otherwise are significantly affects the number of strikes.Bu çalışma Poisson regresyon modelini 1964-1998 döneminde Türkiye'de yapılan grevlere uygulamaktadır .Poisson regresyon modeli bağımlı değişkenin sayılabilir (count) olduğu durumlarda kullanımı tercih edilen bir modeldir. Grevin belirleyicileri olarak ekonomik ve sosyal durumu yansıtan değişkenler kullanılmıştır. Ampirik bulgular işsizlik oranının ve 1980 öncesi ve sonrası dönemi yansıtan kukla değişkenin bir yıl içinde ortaya çıkan grevleri istatistiki olarak etkilediğini göstermiştir

Poisson Regresyon Uygulaması: Türkiye'deki Grevlerin Belirleyicileri 1964 - 1998

This study applies a Poisson regression model to annual Turkish strikes data of the period of 1964-1998. The Poisson regression model is preferable when the dependent variable is count data. Economical and social variables are used as determinants of the number of strikes. Empirical results show that the unemployment rate and a dummy variable that takes 0 before 1980 1 otherwise are significantly affects the number of strikes.Bu çalışma Poisson regresyon modelini 1964-1998 döneminde Türkiye'de yapılan grevlere uygulamaktadır .Poisson regresyon modeli bağımlı değişkenin sayılabilir (count) olduğu durumlarda kullanımı tercih edilen bir modeldir. Grevin belirleyicileri olarak ekonomik ve sosyal durumu yansıtan değişkenler kullanılmıştır. Ampirik bulgular işsizlik oranının ve 1980 öncesi ve sonrası dönemi yansıtan kukla değişkenin bir yıl içinde ortaya çıkan grevleri istatistiki olarak etkilediğini göstermiştir

Collision Avoidance via Adaptive Trajectory Control in Case of a Sudden Decrease in the Maximum Road Friction Coefficient

This study analyses an Adaptive Trajectory Control (ATC) system in case of a sudden change in μ-max (maximum tyreroad friction coefficient) during an emergency lane change manoeuvre in order to maintain the driving safety. Autonomous front wheel steering (FWS) systems have been developed for emergency steering situations. The trajectory design is also a part of these systems. Moreover, in this study ATC has been designed by sensing μ-max to complete the emergency steering manoeuvre successfully. Therefore, the originality of this paper arises from the necessity of a trajectory change in case of a sudden change in μ-max to minimize the distance between the desired and the actual path. Suitable cases were designed by using a two-track model in IPG/CarMaker (MATLAB/Simulink). Results show that ATC could be used during an emergency steering manoeuvre in case of a sudden decrease in μ-max as it can be advantageous in certain critical traffic situations. Therefore, ATC could beused as an alternative system instead of Electronic Stability Program.</p