Spectral function of the Anderson impurity model at finite temperatures

Using the functional renormalization group (FRG) and the numerical renormalization group (NRG), we calculate the spectral function of the Anderson impurity model at zero and finite temperatures. In our FRG scheme spin fluctuations are treated non-perturbatively via a suitable Hubbard-Stratonovich field, but vertex corrections are neglected. A comparison with our highly accurate NRG results shows that this FRG scheme gives a quantitatively good description of the spectral line-shape at zero and finite temperatures both in the weak and strong coupling regimes, although at zero temperature the FRG is not able to reproduce the known exponential narrowing of the Kondo resonance at strong coupling.Comment: 6 pages, 3 figures; new references adde

Повышение рационального использования человеческого потенциала

Реферат Выпускная квалификационная работа содержит 131 страницу, 20 рисунков, 39 таблиц, 50 использованных источников, 6 приложений. Ключевые слова: персонал, человеческий потенциал, рациональное использование, адаптация, компетенции, ПАО «ТРК», социальная ответственность компании. . Объектом исследования в работе является: рациональное использование человеческого потенциала компании. . Цель работы - рассмотрение методов повышения рационального использования человеческого потенциала современной компании . В процессе исследования проводились: 1) рассмотрение деятельности компании за 2011 – 2015 гг.; оценка действующей в компании системы управления персоналом и человеческого потенциала компании; 3) внесение предложений по совершенствованию действующей системы управления человеческим потенциалом компании (с расчетом экономической эффективности от внесенных предложений). . В результате исследования: внесены предложения по внедрению в кадровую работу системы периодической сверки компетенций и улучшению работы с кадровым резервом; проведен расчет экономии от внедрения предлагаемых мероприятий . Степень внедрения: запланировано применение внесенных по результатам проведенного исследования предложений в деятельность компании в 2016 г. . Область применения: управление персоналом и человеческим потенциалом в ПАО «ТРК». . Экономическая эффективность/ значимость работы: сумма полученной экономии составит 4 165 тыс. руб. в год. . В будущем планируется: применение внесенных по результатам проведенного исследования предложений в деятельность компании.abstract Final qualifying work includes 131 page, 20 figures, 39 tables, 50 sources used, 6 applications. Keywords: personnel, human potential, rational use, adaptation, competence, PJSC "TRK" social responsibility of the company. . The object of research is in: the rational use of human resources. . Purpose - to examine the methods of enhancing the rational use of the human potential of the modern company. The study carried out: 1) review of the activities of the company for 2011 - 2015 .; assessment of the current in the company personnel management and human resources of the company; 3) make proposals to improve the existing control system of the human potential of the company (with the calculation of the cost-effectiveness of the proposals). . As a result of the study: made suggestions for the implementation of the personnel working in the periodic verification of competency of the system and improvement of work with the personnel reserve; calculated the savings from the implementation of the proposed activities. Degree of implementation: planned application made by the results of the research proposals in the company's activity in 2016. Field of application: personnel management and human potential in PJSC "TRK". . Cost-effectiveness / value of the work: the sum of the savings will amount to 4165 thousand rubles.. in year. . In the future: an application made on the results of the research proposals in the company's activities

Theory of Optical Tweezers

We derive a partial-wave (Mie) expansion of the axial force exerted on a transparent sphere by a laser beam focused through a high numerical aperture objective. The results hold throughout the range of interest for practical applications. The ray optics limit is shown to follow from the Mie expansion by size averaging. Numerical plots show large deviations from ray optics near the focal region and oscillatory behavior (explained in terms of a simple interferometer picture) of the force as a function of the size parameter. Available experimental data favor the present model over previous ones.Comment: 4 pages, 3 figure

Wilson chains are not thermal reservoirs

Wilson chains, based on a logarithmic discretization of a continuous spectrum, are widely used to model an electronic (or bosonic) bath for Kondo spins and other quantum impurities within the numerical renormalization group method and other numerical approaches. In this short note we point out that Wilson chains can not serve as thermal reservoirs as their temperature changes by a number of order Delta E when a finite amount of energy Delta E is added. This proves that for a large class of non-equilibrium problems they cannot be used to predict the long-time behavior.Comment: 2 page

Detection of the tagged or untagged photons in acousto-optic imaging of thick highly scattering media by photorefractive adaptive holography

We propose an original adaptive wavefront holographic setup based on the photorefractive effect (PR), to make real-time measurements of acousto-optic signals in thick scattering media, with a high flux collection at high rates for breast tumor detection. We describe here our present state of art and understanding on the problem of breast imaging with PR detection of the acousto-optic signal

Extension of Yeast Chronological Lifespan by Methylamine

Background: Chronological aging of yeast cells is commonly used as a model for aging of human post-mitotic cells. The yeast Saccharomyces cerevisiae grown on glucose in the presence of ammonium sulphate is mainly used in yeast aging research. We have analyzed chronological aging of the yeast Hansenula polymorpha grown at conditions that require primary peroxisome metabolism for growth. Methodology/Principal Findings: The chronological lifespan of H. polymorpha is strongly enhanced when cells are grown on methanol or ethanol, metabolized by peroxisome enzymes, relative to growth on glucose that does not require peroxisomes. The short lifespan of H. polymorpha on glucose is mainly due to medium acidification, whereas most likely ROS do not play an important role. Growth of cells on methanol/methylamine instead of methanol/ammonium sulphate resulted in further lifespan enhancement. This was unrelated to medium acidification. We show that oxidation of methylamine by peroxisomal amine oxidase at carbon starvation conditions is responsible for lifespan extension. The methylamine oxidation product formaldehyde is further oxidized resulting in NADH generation, which contributes to increased ATP generation and reduction of ROS levels in the stationary phase. Conclusion/Significance: We conclude that primary peroxisome metabolism enhanced chronological lifespan of H. polymorpha. Moreover, the possibility to generate NADH at carbon starvation conditions by an organic nitrogen source supports further extension of the lifespan of the cell. Consequently, the interpretation of CLS analyses in yeast should include possible effects on the energy status of the cell.

Measurements of Transverse Energy Flow in Deep-Inelastic Scattering at HERA

Measurements of transverse energy flow are presented for neutral current deep-inelastic scattering events produced in positron-proton collisions at HERA. The kinematic range covers squared momentum transfers Q^2 from 3.2 to 2,200 GeV^2, the Bjorken scaling variable x from 8.10^{-5} to 0.11 and the hadronic mass W from 66 to 233 GeV. The transverse energy flow is measured in the hadronic centre of mass frame and is studied as a function of Q^2, x, W and pseudorapidity. A comparison is made with QCD based models. The behaviour of the mean transverse energy in the central pseudorapidity region and an interval corresponding to the photon fragmentation region are analysed as a function of Q^2 and W.Comment: 26 pages, 8 figures, submitted to Eur. Phys.