Total Quantum Zeno effect and Intelligent States for a two level system in a squeezed bath

In this work we show that by frequent measurements of adequately chosen observables, a complete suppression of the decay in an exponentially decaying two level system interacting with a squeezed bath is obtained. The observables for which the effect is observed depend on the the squeezing parameters of the bath. The initial states which display Total Zeno Effect are intelligent states of two conjugate observables associated to the electromagnetic fluctuations of the bath.Comment: 5 pages, 3 figure

Magnetotail energy dissipation during an auroral substorm.

Violent releases of space plasma energy from the Earth's magnetotail during substorms produce strong electric currents and bright aurora. But what modulates these currents and aurora and controls dissipation of the energy released in the ionosphere? Using data from the THEMIS fleet of satellites and ground-based imagers and magnetometers, we show that plasma energy dissipation is controlled by field-aligned currents (FACs) produced and modulated during magnetotail topology change and oscillatory braking of fast plasma jets at 10-14 Earth radii in the nightside magnetosphere. FACs appear in regions where plasma sheet pressure and flux tube volume gradients are non-collinear. Faster tailward expansion of magnetotail dipolarization and subsequent slower inner plasma sheet restretching during substorm expansion and recovery phases cause faster poleward then slower equatorward movement of the substorm aurora. Anharmonic radial plasma oscillations build up displaced current filaments and are responsible for discrete longitudinal auroral arcs that move equatorward at a velocity of about 1km/s. This observed auroral activity appears sufficient to dissipate the released energy

Convergence of finite volume scheme for degenerate parabolic problem with zero flux boundary condition

This note is devoted to the study of the finite volume methods used in the discretization of degenerate parabolic-hyperbolic equation with zero-flux boundary condition. The notion of an entropy-process solution, successfully used for the Dirichlet problem, is insufficient to obtain a uniqueness and convergence result because of a lack of regularity of solutions on the boundary. We infer the uniqueness of an entropy-process solution using the tool of the nonlinear semigroup theory by passing to the new abstract notion of integral-process solution. Then, we prove that numerical solution converges to the unique entropy solution as the mesh size tends to 0

Modern data protection methods in russian device as example

В статье рассматривается аналитическое мнение и результаты опросов крупных компаний на предмет ущерба от утечек информации, выяснилось, что почти 90% компаний страдают от утечек информации, не имеют случаев утечки информации, которые могут принести ущерб только 8% компаний. Приведена классификация угроз информационной безопасности, выделены случайные и преднамеренные типы угроз. Рассматриваются последствия исполнения угроз безопасности: разрушение информации, модификация, доступ третьих лиц. Также приведена схема обмена информацией между двумя субъектами с подробным рассмотрением этапов, на которых может быть получен несанкционированный доступ к информации. Приводятся способы защиты от различных угроз на каждом этапе передачи информации. Особое внимание уделено методам аутентификации для получения авторизации доступа к ресурсам системы. Кратко рассматривается новое российское устройство и его уникальные функции в сравнении с существующими криптографическими средствами защиты информации.In this article viewed analytic opinion and company’s interview results about damage from information leaks, revealed that near 90% companies suffer from information leaks, only 8% of companies not suffer from leaks. Show information security threats classification, allocated casual and intentional threats types. Show consequences information threats execution: information damage, modify, unauthorized access. Also view information exchange structure between two subjects with detailed description every phase, which contain way for unauthorized access. Observe different ways for protect from any threats in every phase of data transfer. Emphasis paid to authentication methods for authorized access to system resources. Brief observe new Russian device with unique features in compare with existing cryptographic data protection devices

Analysis of ecopsychological types of interactions in medical institution environment

The study is based on the intersection of ecopsychological and subjective approaches and devoted to the research of psychological conditions for interaction of medical personnel in medical institution environmen

Anharmonic oscillatory flow braking in the Earth's magnetotail

Plasma sheet bursty bulk flows often oscillate around their equilibrium position at about 10 REdowntail. The radial magnetic field, pressure, and flux tube volume profiles usually behave differently earthward and tailward of this position. Using data from five Time History of Events and Macroscale Interactions during Substorms (THEMIS) probes, we reconstruct these profiles with the help of an empirical model and apply thin filament theory to show that the oscillatory flow braking can occur in an asymmetric potential. Thus, the thin filament oscillations appear to be anharmonic, with a power spectrum exhibiting peaks at both the fundamental frequency and the first harmonic. Such anharmonic oscillatory braking can explain the presence of the first harmonic in Pi2 pulsations (frequency doubling), which are simultaneously observed by magnetometers on the ground near the conjugate THEMIS footprints

In situ visualization of Ni-Nb bulk metallic glasses phase transition

We report the results of the Ni-based bulk metallic glass structural evolution and crystallization behavior in situ investigation. The X-ray diffraction (XRD), transmission electron microscopy (TEM), nano-beam diffraction (NBD), differential scanning calorimetry (DSC), radial distribution function (RDF) and scanning probe microscopy/spectroscopy (STM/STS) techniques were applied to analyze the structure and electronic properties of Ni63.5Nb36.5 glasses before and after crystallization. It was proved that partial surface crystallization of Ni63.5Nb36.5 can occur at the temperature lower than for the full sample crystallization. According to our STM measurements the primary crystallization is originally starting with the Ni3Nb phase formation. It was shown that surface crystallization drastically differs from the bulk crystallization due to the possible surface reconstruction. The mechanism of Ni63.5Nb36.5 glass alloy 2D-crystallization was suggested, which corresponds to the local metastable (3x3)-Ni(111) surface phase formation. The possibility of different surface nano-structures development by the annealing of the originally glassy alloy in ultra high vacuum at the temperature lower, than the crystallization temperature was shown. The increase of mean square surface roughness parameter Rq while moving from glassy to fully crystallized state can be caused by concurrent growth of Ni3Nb and Ni6Nb7 bulk phases. The simple empirical model for the estimation of Ni63.5Nb36.5 cluster size was suggested, and the obtained values (7.64 A, 8.08 A) are in good agreement with STM measurements data (8 A-10 A)

Построение математической модели механизма привода ножа бумагорезальной машины БР-125

Побудована математична модель шарнірно-важільного механізму, як системи рівнянь, що характеризують стан механізму у кожен момент часу. Розроблено прикладну програму для проведення повного кінематичного аналізу на прикладі приводу одноножевої паперорізальної машини БР-125. Розроблено метод побудови математичної моделі шарнірно-важільного механізму 3-го класу з застосуванням ПЗ «Maple». Розглянуто методику дискретного розрахунку кінематичних характеристик ланок протягом робочого циклу. Проведено кінематичний розрахунок на прикладі приводу ОРМ БР-125. Створено базу для проведення силового аналізу.Construction of mathematical models of lever mechanism as a system of equations characterizing the mechanism in each moment. Development application for a full kinematic analysis on example of drive mechanism of one-knife papercutter machine BR-125. Developed an original method for constructing mathematical models of 3rd class lever mechanism on example of drive mechanism of one-knife papercutter BR-125. In the calculations used mathematical programming package «Maple». The method of calculating the kinematic characteristics of discrete units during the working cycle was described. This was determined by the coordinates of the fixed points of chains depending on the angle of rotation of the input chain using the method of geometric bindings. These were based on interpolated using Lagrandzh polynoms and differentiated for velocity and acceleration of these points. As a result of the work were obtained kinematic characteristics (speed, acceleration) of the main points of the mechanism and established framework for power analysis.Разработан метод построения математической модели шарнирно-рычажного механизма 3-го класса с применением ПО «Maple». Рассмотрена методика дискретного расчета кинематических характеристик звеньев в течении рабочего цикла. Проведен кинематический расчет на примере механизма привода ОРМ БР-125. Создана база для проведения силового анализа