Nanoscale Sensing Using Point Defects in Single-Crystal Diamond: Recent Progress on Nitrogen Vacancy Center-Based Sensors

Individual, luminescent point defects in solids so called color centers are atomic-sized quantum systems enabling sensing and imaging with nanoscale spatial resolution. In this overview, we introduce nanoscale sensing based on individual nitrogen vacancy (NV) centers in diamond. We discuss two central challenges of the field: First, the creation of highly-coherent, shallow NV centers less than 10 nm below the surface of single-crystal diamond. Second, the fabrication of tip-like photonic nanostructures that enable efficient fluorescence collection and can be used for scanning probe imaging based on color centers with nanoscale resolution.Comment: Overview paper on sensing with defects in diamond, we focus on creation of shallow NV centers and nanostructures, Final Version published in Crystal

Milli Kütüphane

Taha Toros Arşivi, Dosya No: 111-Kütüphanelerİstanbul Kalkınma Ajansı (TR10/14/YEN/0033) İstanbul Development Agency (TR10/14/YEN/0033

Behavioural Economics: Classical and Modern

In this paper, the origins and development of behavioural economics, beginning with the pioneering works of Herbert Simon (1953) and Ward Edwards (1954), is traced, described and (critically) discussed, in some detail. Two kinds of behavioural economics – classical and modern – are attributed, respectively, to the two pioneers. The mathematical foundations of classical behavioural economics is identified, largely, to be in the theory of computation and computational complexity; the corresponding mathematical basis for modern behavioural economics is, on the other hand, claimed to be a notion of subjective probability (at least at its origins in the works of Ward Edwards). The economic theories of behavior, challenging various aspects of 'orthodox' theory, were decisively influenced by these two mathematical underpinnings of the two theoriesClassical Behavioural Economics, Modern Behavioural Economics, Subjective Probability, Model of Computation, Computational Complexity. Subjective Expected Utility

Periodic Buried Object Approach For Solving Scattering Problems Related To Periodic Rough Surfaces

Tez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2008Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2008Bu tez çalışmasında, elektromanyetik dalgaların periyodik engebeli dielektrik yüzeylerden saçılmasına yönelik yeni bir yöntem ele alınmıştır. Ele alınan yöntem, Periyodik Gömülü Cisim Yaklaşımı, sonsuz uzunluktaki engebeli yüzeylerden saçılma problemini cözen Gömülü Cisim Yaklaşımı’nın periyodik yüzeylere uygulanmasıyla elde edilmiştir. Gömülü Cisim Yaklaşımı, engebeli yüzeylerden saçılma problemini düzlemsel arayüz ile ayrılan iki boyutlu uzayda yer alan silinidirik cisimlerden saçılma şeklinde varsayarak modeller. Bu sayede, periyodik Green’s fonkisiyonun yardımıyla problem ikinci tür bir Fredholm integral eşitliği probleminin çözümüne indirgenir. İki boyutlu uzayın periyodik Green’s fonksiyonu efektik yöntemler kullanılarak sayısal hesaplamları yapılan Floquet mod açılımıyla hesaplanır. Tezde alınan Periyodik Gömülü Cisim Yaklaşımı,aynı zamanda sonsuz uzunukta olup bölgesel engebeye sahip yüzeylerden saçılma problemlerinin çözümünde de kullanılabilir. Sayısal simülasyonlar, yeni olan bu yöntemin rasgele dağılıma sahip yüzeyler için efektif ve doğru sonuçlar verdiğini göstermektedir.In this study, a new approach for the scattering of electromagnetic waves from periodic dielectric rough surfaces is addressed. The method is an extension of the buried object approach (BOA), which is developed for rough surfaces of infinite extend, to the present problem. The BOA allows modeling the original problem as the scattering of electromagnetic waves from cylindrical objects located in a two half spaces medium with planar interface. Then, the problem is reduced to the solution of a Fredholm integral equation of second kind through the periodic Green s function of two half space medium. The periodic Green s function of two-half spaces medium is calculated via Floquet mode expansion, whose numerical evaluation can be accelerated by using effective methods. The method can also be used to solve the scattering problems of rough surfaces of infinite extend and having a localized roughness. Numerical simulations show that the method yields effective and accurate results for surfaces of arbitrary variation.Yüksek LisansM.Sc

A Study on Multisecret-Sharing Schemes Based on Linear Codes

Secret sharing has been a subject of study since 1979. In the secret sharing schemes there are some participants and a dealer. The dealer chooses a secret. The main principle is to distribute a secret amongst a group of participants. Each of whom is called a share of the secret. The secret can be retrieved by participants. Clearly the participants combine their shares to reach the secret. One of the secret sharing schemes is  threshold secret sharing scheme. A  threshold secret sharing scheme is a method of distribution of information among  participants such that  can recover the secret but  cannot. The coding theory has been an important role in the constructing of the secret sharing schemes. Since the code of a symmetric  design is a linear code, this study is about the multisecret-sharing schemes based on the dual code  of  code  of a symmetric  design. We construct a multisecret-sharing scheme Blakley’s construction of secret sharing schemes using the binary codes of the symmetric design. Our scheme is a threshold secret sharing scheme. The access structure of the scheme has been described and shows its connection to the dual code. Furthermore, the number of minimal access elements has been formulated under certain conditions. We explain the security of this scheme

Teknolojik değişme ve istihdam arasındaki dinamik ilişki: genç istihdamı ile toplam istihdamın panel VAR ve nedensellik analizleri ile karşılaştırılması

This study empirically examines the relationship and causality between technological change and employment by comparing youth and total employment. It covers data from 16 OECD economies from 1985 to 2018 and uses multifactor productivity (MFP) as a proxy for technological change. The findings from the general method of moments panel vector autoregression (GMM Panel-VAR) approach indicate significant and positive effects of MFP on youth and total employment, and a significant yet negative impact of youth employment on MFP. According to Panel-VAR-Granger- Causality analysis results, there is a two-way causality between MFP and youth employment and a one-way causality from MFP to total employment. Thus, this study empirically confirms the jobcreation effect of technology and finds out that the technological change and employment nexus differs for youth employment compared to that for total employment.Bu çalışma teknolojik değişme ile istihdam arasındaki ilişkiyi ve nedenselliği, genç istihdamı ile toplam istihdamı karşılaştırarak, ampirik olarak incelemektedir. Çalışma, 16 OECD ülkesi için 1985-2018 arası dönemdeki verileri kapsamakta olup teknolojik değişmenin göstergesi olarak çoklu faktör verimliliğini (ÇFV) kullanmaktadır. Genelleştirilmiş Momentler Panel Vektör Otoregresif (GMM Panel-VAR) analizi bulguları, ÇFV’nin genç ve toplam istihdamın üzerinde anlamlı ve pozitif etkisinin bulunduğunu; genç istihdamın ÇFV üzerindeki etkisinin ise anlamlı fakat negatif olduğunu göstermektedir. Panel VAR-Granger Nedensellik analizi bulgularına göre ise ÇFV ile genç istihdamı arasında çift-yönlü, ÇFV’den toplam istihdama doğru ise tek-yönlü nedensellik bulunmaktadır. Böylelikle bu çalışma ile teknolojik değişmenin iş yaratma etkisi ampirik olarak doğrulanmakta ve teknolojik değişme-istihdam ilişkisinin genç istihdamı için, toplam istihdama kıyasla, farklı olduğu sonucunu ulaşılmıştır.Publisher's Versio