392 research outputs found

    Modeling of maturity of gender-oriented project management office

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    The theoretical and practical models of project management offices and the basic principles of creating a Gender-Oriented Project Management Office (РМОG) are analyzed. Attention is drawn to the peculiarities of gender logical project management systems. Approaches and methods for assessing the maturity of the project office are defined. The gender component is extrapolated to the contextual parameters of the project management knowledge areas. The model of estimation of РМОG maturity in the context of the development of gender-oriented project management is developed. It is noted that the level of gender responsibility of РМОG can range from advisory support to the continuous improvement of gender-sensitive project management. A mathematical description is proposed for estimating the level of РМОG maturity. Eight levels of РМОG maturity are outlined: “definition of goals and objectives of the РМОG”; “organization of РМОG”; “development of methods for effective gender-oriented project management”; “development of the organization gender competence”; “recognition of РМОG effectiveness”; “РМОG – center for gender-based project management”; “creation of additional, inclusive, gender project values”; “center for the development of gender-oriented project management”. The global criterion range as a maturity indicator of РМОG is calculated for each level. The proposed evaluation tool can be used by the РМОG directorates and top management of gender-responsible organizations to self-assess the progress in the development of gender-based project management, as well as to select the actions needed to move to a higher level of maturit

    Investigation of the thermophysical properties of high-melting materials with the aid of a complex of instruments

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    The evaporation rate, vapor pressure, heats of evaporation reaction (sublimation, dissociation), enthalpy, electrical resistance, heat capacity, emissivity, and heat conductivity of various carbides, borides, sulfides, nitrides, selenides, and phosphides were investigated. A set of high temperature high vacuum devices, calorimeters (designed for operation at 400 to 1300 K and from 1200 K), and mass spectrometers, most of which were specially developed for these studies, is described

    Unified decoupling scheme for exchange and anisotropy contributions and temperature-dependent spectral properties of anisotropic spin systems

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    We compute the temperature-dependent spin-wave spectrum and the magnetization for a spin system using the unified decoupling procedure for the high-order Green's functions for the exchange coupling and anisotropy, both in the classical and quantum case. Our approach allows us to establish a clear crossover between quantum-mechanical and classical methods by developing the classical analog of the quantum Green's function technique. The results are compared with the classical spectral density method and numerical modeling based on the stochastic Landau-Lifshitz equation and the Monte Carlo technique. As far as the critical temperature is concerned, there is a full agreement between the classical Green's functions technique and the classical spectral density method. However, the former method turns out to be more straightforward and more convenient than the latter because it avoids any \emph{a priori} assumptions about the system's spectral density. The temperature-dependent exchange stiffness as a function of magnetization is investigated within different approaches

    Thirty years after the Chernobyl accident: what lessons have we learnt?

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    April 2016 sees the 30th anniversary of the accident at the Chernobyl nuclear power plant. As a consequence of the accident populations were relocated in Belarus, Russia and Ukraine and remedial measures were put in place to reduce the entry of contaminants (primarily 134+137Cs) into the human food chain in a number of countries throughout Europe. Remedial measures are still today in place in a number of countries, and areas of the former Soviet Union remain abandoned. The Chernobyl accident led to a large resurgence in radioecological studies both to aid remediation and to be able to make future predictions on the post-accident situation, but, also in recognition that more knowledge was required to cope with future accidents. In this paper we discuss, what in the authors' opinions, were the advances made in radioecology as a consequence of the Chernobyl accident. The areas we identified as being significantly advanced following Chernobyl were: the importance of semi-natural ecosystems in human dose formation; the characterisation and environmental behaviour of ‘hot particles'; the development and application of countermeasures; the “fixation” and long term bioavailability of radiocaesium and; the effects of radiation on plants and animals

    Optically Isotropic and Monoclinic Ferroelectric Phases in PZT Single Crystals near Morphotropic Phase Boundary

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    We report the finding of unusual scale-dependent symmetry below the ferroelectric Curie temperature in the perovskite Pb(Zr1-xTix)O3 single crystals of morphotropic phase boundary compositions. The crystals of tetragonal symmetry (from x-ray diffraction experiments) on sub-micrometer scale exhibit a macroscopic (optically determined) cubic symmetry. This peculiar optical isotropy is explained by the anomalously small size of tetragonal ferroelectric domains. Upon further cooling the crystals transform to the phase consisting of micrometer-sized domains of monoclinic Cm symmetry.Comment: 7 pages, 3 figure

    Ultra-fast spin dynamics: the effect of colored noise

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    Recent experimental results have pushed the limits of magnetization dynamics to pico- and femtosecond timescales. This ultra-fast spin dynamics occurs in extreme conditions of strong and rapidly varying fields and high temperatures. This situation requires new description of magnetization dynamics, even on a phenomenological level of the atomistic Landau-Lifshitz-Gilbert equation, taking into account that the correlation time for electron system could be of the order of the inverse characteristic spin frequency. For this case we introduce the thermodynamically correct phenomenological approach for spin dynamics based on the Landau-Lifshitz-Miyasaki-Seki equation. The influence of the noise correlation time on longitudinal and transverse magnetization relaxation is investigated. We also demonstrate the effect of the noise correlation time on demagnetisation rate of different materials during laser-induced dynamics

    The possibility of hyperbaric oxygenation in the correction of the secretory impaired fertility in men

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    The infertility problem during a marriage affects demographic indicators significantly and has not only medical and biological but important social significance as well. In Russia, about 20 % of married couples remain infertile. With that, in half of cases this is caused with pathological changes in male reproductive system. Until now, a comprehensive andrologic examination is not capable of finding out the reason of pathospermia in 40–72 % of cases of male infertility and, as a result, of assigning the appropriate etiotropic treatment. A comparative dynamic study of spermograms of 107 patients with idiopathic pathozoospermia depending on various types of treatment has been held immediately, 1 month, and 2 months after completion of the therapy course. It has been determined that significantly greater and sustained improvement in quality and quantity of ejaculate is achieved in 1 month as compared to monotherapy with L-carnitine in combination with hyperbaric oxygenation by eliminating the effects of hypoxia and oxidativestress, and the effect is maintained during the whole term of observation

    The influence of Pb vacancies on the properties of PZT-type ceramics transducers

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    This article is dedicated to prof. J. Ranachowski The result of investigations of the influence of lead vacancies on the crystalline structure of PZT-type ceramic piezoelectric materials is presented. The solid solution of PbTiO3 - PbZrO3 - sigma n=13 Pb(B'1-alpha B''alpha)O3, characterized by the perovskite-type structure (ABO3), is the basis of those materials. The lead vacancies (VPb) was originated by a thermal treatment. Investigations of the influence of the lead deficiency on the crystalline structure of PZT-type ceramics have been performed for solid solutions characterized by compositions corresponding to the tetragonal or rhombohedral boundary of the morphotropic region (PCR-1, PCR-8: Piezoelectric Ceramics of Rostov) and to tetragonal phase region compositions (ceramics of Pb1-x(Zr0.39Ti0.59W0.01Cd0.01) O3). It has been found that the deficiency in lead causes a reconstruction of the perovskite phase crystalline structure or a change of the elementary cell parameters of that phase. The solid solutions on the basis of Pb(Zr,Ti)O3 resolve themselves into PbTiO3, ZrO2 and PbO when the lead deficiency caused by thermal treatment increases

    Review on uranium in soil: levels, migration

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    The problems of radioactive contamination of biosphere with the 238U in recent years have attracted a large number of experts in various fields of knowledge. Natural radionuclides are an integral part of the biosphere. They are concentrated everywhere: in rocks, in soil, water, air and food. Various types of phosphorus fertilizers and other natural ameliorants used in agriculture are also an additional source of heavy natural radionuclides. The review describes the behaviour and migration of 238U in biosphere, which depend on various factors acting simultaneously. It is noted that the behaviour of 238U in the soil depends on the forms of its presence in it and the physical and chemical properties of the soil. The processes of sorption and desorption of 238U by different soil types are significant indicators

    Pressure effect on the in-plane magnetic penetration depth in YBa_2Cu_4O_8

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    We report a study of the pressure effect (PE) on the in-plane magnetic field penetration depth lambda_{ab} in YBa_2Cu_4O_8 by means of Meissner fraction measurements. A pronounced PE on lambda_{ab}^{-2}(0) was observed with a maximum relative shift of \Delta\lambda^{-2}_{ab}/\lambda^{-2}_{ab}= 44(3)% at a pressure of 10.2 kbar. It arises from the pressure dependence of the effective in-plane charge carrier mass and pressure induced charge carrier transfer from the CuO chains to the superconducting CuO_2 planes. The present results imply that the charge carriers in YBa_2Cu_4O_8 are coupled to the lattice.Comment: 4pages 3 figure
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