Changes in the near-surface stress in titanium caused by krypton ion-implantation

Word processed copy.Includes bibliographical references.In this work, the effect of krypton implantation on the morphology of titanium samples is investigated through scanning electron microscopy (SEM). Rutherford backscattering spectrometry (RBS) was also used to determine the dose and depth of implanted krypton. The krypton profiile in titanium, and the associated damage profile, was modelled with TRIM calculations. In addition, metallurgical techniques were also used to examine the microstructure details of the as-received, unimplanted titanium sample

Formation and dynamics of defects in pure and ion implanted a-titanium studied by quantum simulations

Includes bibliographical references (leaves 123-136).Density-functional theory calculations have been performed to study energetics of defects formation and diffusion in pure and krypton implanted hexagonal closed-packed (h.c.p) titanium. We employed the ab initio electronic structure calculations to study the formation energies of Ti vacancies and divacancies, Kr interstitials, and the binding of Kr atoms and Ti vacancies to form defect complexes. In addition, we present results on the diffusion of vacancies, divacancies, as well as the substitutional and interstitial krypton atom in h.c.p Ti. The calculated monovacancy formation energy is 1.97eV, which is in excellent agreement with other theoretical calculations, and agrees qualitatively with published experimental results

Финансовые риски в деятельности организации (на примере ООО «Зубная аптека»)

Объектом исследования является деятельность ООО "Зубная аптека" (г. Томск) Предметом исследования являются финансовые риски в деятельности организации. Целью выпускной квалификационной работы является разработка рекомендаций по снижению финансовых рисков в деятельности организации на примере ООО "Зубная аптека". В результате исследования: рассмотрена сущность финансового риска, методики оценки финансовых рисков, рассмотрены механизмы нейтрализации финансовых рисков; изучена характеристика деятельности ООО "Зубная аптека", проведен анализ и оценка финансовых рисков, разработаны общие рекомендации по снижению финансовых рисков в деятельности организации.The object of the study is the activity of LLC "Dental Pharmacy" (Zubnaya Apteka LLC (Tomsk). The subject of the study is the financial risks in the organization's activities. The purpose of the final qualification work is to develop recommendations for reducing financial risks in the organization's activities on the example of LLC "Dental Pharmacy". As a result of the study: the essence of financial risk, methods of assessing financial risks, mechanisms for neutralizing financial risks are considered; the characteristics of the activities of LLC "Dental Pharmacy" are studied, the analysis and assessment of financial risks are carried out, general recommendations for reducing financial risks in the organization's activities are developed

Solution of near-field thermal radiation in one-dimensional layered media using dyadic Green's functions and the scattering matrix method

Due to copyright restrictions, the access to the full text of this article is only available via subscription.A general algorithm is introduced for the analysis of near-field radiative heat transfer in one-dimensional multi-layered structures. The method is based on the solution of dyadic Green's functions, where the amplitude of the fields in each layer is calculated via a scattering matrix approach. Several tests are presented where cubic boron nitride is used in the simulations. It is shown that a film emitter thicker than 1 μm provides the same spectral distribution of near-field radiative flux as obtained from a bulk emitter. Further simulations have pointed out that the presence of a body in close proximity to an emitter can alter the near-field spectrum emitted. This algorithm can be employed to study thermal one-dimensional layered media and photonic crystals in the near-field in order to design radiators optimizing the performances of nanoscale-gap thermophotovoltaic power generators.US Department of Energy ; Kentucky Science and Engineering Foundatio