Tensor Products of Operator Systems

The purpose of the present paper is to lay the foundations for a systematic study of tensor products of operator systems. After giving an axiomatic definition of tensor products in this category, we examine in detail several particular examples of tensor products, including a minimal, maximal, maximal commuting, maximal injective and some asymmetric tensor products. We characterize these tensor products in terms of their universal properties and give descriptions of their positive cones. We also characterize the corresponding tensor products of operator spaces induced by a certain canonical inclusion of an operator space into an operator system. We examine notions of nuclearity for our tensor products which, on the category of C*-algebras, reduce to the classical notion. We exhibit an operator system S which is not completely order isomorphic to a C*-algebra yet has the property that for every C*-algebra A, the minimal and maximal tensor product of S and A are equal.Comment: 41 pages Version III Journal of Functional Analysis (to appear

Advanced tunability of optical properties of CdS/ZnSe/ZnTe/CdSe multi-shell quantum dot by the band edge engineering

In this study, the advanced manipulability of wave functions in a type-II multi-shell hetero-nanostructure (MS-HNS) and the tunability of radiative exciton lifetime over a wide range with and/or without changing in transition energies has been demonstrated by the band edge engineering. For this purpose, the electronic and optical properties of exciton (X) and biexciton (XX) in a spherical CdS/ZnSe/ZnTe/CdSe HNS have been explored in detail. In the calculations, effects of all Coulombic interactions between the charges have been taken into account on the wave functions. Moreover, in the case of XX, the exchange-correlation potential between the same charged particles has also been considered. The results have been presented as a function of CdS core radius and ZnSe shell thickness and the probable physical reasons have been discussed in detail

Özelleştirme sürecinde Tekel Fabrikasından İzmir katip Çelebi Üniversitesi kampüsüne : Dönüşen mekan, iş ve hayatlar

xiii, 142 sayfaşekil, resim : 29 cm. 1 CDÖZETDerinlemesine görüşme yöntemi kullanılarak yapılan bu nitel araştırmanın ikiamacı bulunmaktadır. Birinci amaç, devlet kurumlarında yaşanan özelleştirmesüreçlerinin kurumlarda çalışan personele etkilerini TEKEL kurumu özelleşmesiüzerinden ve halihazırda İzmir Kâtip Çelebi Üniversitesi’nde çalışan eski TEKELişçilerinin tanıklığı ile anlamaktır. Çalışmanın ikinci temel amacı ise mekân olarakTEKEL fabrikasından İzmir Kâtip Çelebi Üniversitesi kampüs alanına dönüşenmekânın yine sözlü tarih ile dönüşen fonksiyonlarını, içinde yaşayanlar içinanlamını, birinci amaç ile ilişkili olarak anlamaktır. Bu çalışmada sözlü tarihçalışmalarında tercih edilen derinlemesine görüşme yönteminden istifadeylekeşfedici bir araştırma yapılmaya çalışılmıştır.TEKEL işçilerinin sözlü tarih anlatıları ışığında yaşadıkları süreç, şu an içindebulundukları ortam, TEKEL’de yaşadıkları ele alınmıştır.ABSTRACTThis qualitative research is using in-depth interview method and has twoobjectives. The first aim is to understand the effects of the privatization processes onthe personnel working in the institutions by focusing on the privatization of TEKELfactory and the testimonials of the former TEKEL workers who are currentlyworking in Izmir Katip Celebi University. The second aim of the study is tounderstand the functions of the space which has been transformed from the TEKELfactory into the campus area of Izmir Katip Celebi University, and its meaning forthe people living in it. In this study, the emphasis is on exploratory research with thehelp of the in-depth interview method more common in oral history studies. In thelight of oral history narratives of TEKEL workers, the environment they live in, theenvironment they live in, their experiences in TEKEL.Consequently, by evaluating the qualitative data obtained from the interviewswith the TEKEL workers working within the university, the effect of privatization onthese people has been interpreted together within the conceptual framework ofprivatization