Radii of starlikeness and convexity of Wright functions

In this paper our aim is to find the radii of starlikeness and convexity of the normalized Wright functions for three different kind of normalization. The key tools in the proof of our main results are the Mittag-Leffler expansion for Wright function and properties of real zeros of Wright function and its derivative. In addition, by using the Euler-Rayleigh inequalities we obtain some tight lower and upper bounds for the radii of starlikeness and convexity of order zero for the normalized Wright functions. The main results of the paper are natural extensions of some known results on classical Bessel functions of the first kind. Some open problems are also proposed, which may be of interest for further research

Öğretmen adayları için bilgi güvenliği ve bilişim etiği dersinin tasarım, geliştirme ve uygulaması: tasarım temelli araştırma.

With the introduction of the Information and Communication Technologies (ICT) into our lives, production and distribution of information have increased exponentially. The ICT systems and the data, which these systems use, create, or both is an essential resource of schools. For this reason, the secure and ethical use of information is a primary concern for schools. However, the curriculum in teacher training institutions does not include a course that aims to raise pre-service teachers’ awareness of information security and cyberethics. In other words, there is a need for more instructional content on information security and cyberethics for pre-service teachers. The designed, developed and implemented course for this study significantly improves the amount of content for pre-service teachers’ information security awareness and cyberethics sensitivity. The main purpose of this study is to explore important points of designing process of a course including such an instructional content, to enhance pre-service teachers’ information security awareness and cyberethics sensitivity in the Faculty of Education. The research questions of the study can be summarized as; (i) what are content, learner, and instruction related issues during the design and development of a course to increase the pre-service teachers’ information security awareness and cyberethics sensitivity? (ii) What are the facilitating and challenging factors faced during the implementation, and how the challenges are handled from the instructor’s experience? (iii) How do pre-service teachers perceive the contribution of the course on their information security awareness and cyberethics sensitivity? Design-Based Research (DBR) approach with qualitative methods is carried out to answer these questions. As a result of this research, a course content aimed at raising pre-service teachers’ information security and cyberethics awareness presented, and critical elements in the design and development process of such a course are identified. In the scope of the study, during the need analysis and the development phases of the study, a content pool including different cybersecurity, cyberethics, and cybersafety issues and a draft content sequence have emerged. At the end of the two iterative implementation phases, the course design has reached to the final form which included different instructional methods such as face to face lecture sessions, online discussion forums and in-class discussion sessions, reading materials, and different audiovisual materials. The qualitative data analysis shows that the course influenced the students’ preferences on online activities and password protection strategies. Besides, their information security and cyberethics awareness have raised. Furthermore, daily life correspondence of the course topics facilitates the instruction process and increases the learners’ interest.Thesis (Ph.D.) -- Graduate School of Natural and Applied Sciences. Computer Education and Instructional Technology

Deri finisajında nanoteknolojik uygulama ile tuşe dayanımının artırılması üzerine bir Araştırma

Nano polysiloxane emulsions produced by nanotechnolojical methods, instead of micron sized (classical) emulsions, applying to leather and permanence of physical aspects are examined comparatively. It is aimed to make researches on the finishing which is the last process of leather production and that adds final aspect and feel touch to material. the aim of the research is to increase of sustainability of feel touch by emulsions produced by nanotechnological methods, accordingly micron sized classical ones added to leather by finishing process, thus to provide quality of new look and performance of feel touch of any leather product. This study consists of three main chapters. in the first chapter, micron and nano sized feel modifiers which has been chosen according to their pArticle sizes are used on leather's top coat with spraying on which water based finished leathers. An organoleptic analyze is done to choose reference amount of application for feel modifiers and then two of nano and classical feel modifiers are applied on garment leathers to be analyzed. in the second chapter, leathers which are put through above process, accelerated aging processes are done with heat, humidity and UV light effects depending in accordance with related standards. in the third chapter, accelerated aging applied leather's dynamic friction coefficients are measured comparatively, synchronously silicon (SI) content of leathers are analyzed by Inductively Coupled PlasmaOptic Emission Spectroscopy (ICP-OES). After then, using Scanning Electron Microscope (SEM), micrographs belong to leather samples are taken and surface aspects are examined. Statistical evaluations of achieved data showed that nano sized polysiloxane feel modifiers are clearly more sustained on leather compared to classical sized ones. Thereby, it can be provided for any kind of leather product to keep its new look and feel touch for longer time when applied with nano sized polysiloxane feel modifiers.Bu çalışmada; nanoteknolojik yöntemlerle üretilmiş nano polisi/aksan emülsiyonların, deri finisajında günümüzde kullanılmakta olan mikron boyutlu silisyum içeren tutum verici emülsiyonların yerine, deriye uygulanabilirlik/eri ve elde edilen fiziksel özelliklerin kalıcılık/arı karşılaştırmalı olarak araştırılmıştır. Araştırmanın amacı, deriye finisaj işlemi ile kazandırılan ve tuşe olarak adlandırılan tutum özelliğinde kalıcılığın artırılabilir/iğini; dolayısı ile mamul deri eşyanın yeni olma niteliği ve tutum özelliklerinin daha uzun süre korunmasını sağlamaktır. Araştırma üç ana bölümden oluşmaktadır. İlk bölüm; partikül boyutları belirlenerek seçilen mikron ve nano boyutlu iki adet tuşenin, su esaslı finisaj malzemeleri ile astar ve boya katları uygulanmış derilerin son katlarına, farklı oranlarda tatbik edilmesi, organa/eptik değerlendirme ile referans uygulama miktarlarının belirlenmesi ve söz konusu polisi/aksan tuşelerin, giysilik koyun derilerine uygulanmasını kapsamaktadır. İkinci bölümde; tuşe uygulaması yapılmış olan deri/ere: Nem, ısı ve UV ışığı etkisi ile hızlandırılmış yağlandırma işlemleri yapılmıştır. Üçüncü bölümde ise; hızlandırılmış yağlandırma yapılmış derilerin; dinamik sürtünme katsayıları karşılaştırmalı olarak ölçülmüş, eşzamanlı olarak İndüklenmiş Çift Plazma/ı Optik Emisyon Spektrometresi (ICP-OES) cihazı ile sürtünme öncesi ve sonrası silisyum (Si) tayinleri yapılmış ve daha sonra Taramalı Elektron Mikroskobu (SEM) ile mikrografları çekilmiş ve yüzey özellikleri görsel olarak incelenmiştir. Elde edilen veriler istatistiksel olarak değerlendirilmiş, nano boyutlu tuşenin klasik boyutlu tuşeye göre, açıkça daha uzun süre deri üzerinde kalabildiği, dolayısı ile nano polisi/aksan tuşe uygulanmış mamul derinin, tutum özellikleri ile yeni olma niteliğini daha uzun süre koruyabileceği saptanmıştır