822 research outputs found
Функції держави у регулюванні відносин власності
ДВНЗ «Київ. нац. екон. ун-т ім. Вадима Гетьмана»Окреслено основні функції держави в регулюванні трансформаційними процесами в системі і відносинах власності на нинішньому етапі розвитку ринкової економіки в Україні. Обґрунтовано, що вдосконалення відносин власності має здійснюватися шляхом формування раціональної структури власності та бюджетних видатків, якісного правового поля, ефективної системи контролю, якісної нормативно-правової бази, підвищення конкурентоспроможності національного виробництва.Определены основные функции государства в регулировании трансформационными процессами в системе и отношениях собственности на нынешнем этапе развития рыночной экономики в Украине. Обосновано, что совершенствование отношений собственности должно осуществляться путем формирования рациональной структуры собственности и бюджетных расходов, качественного правового поля, эффективной системы контроля, качественной нормативно-правовой базы, повышения конкурентоспособности национального производства.The basic functions of the state in regulating the transformation processes in the system and property relations at the present stage of development of the market economy in Ukraine are determined in the article. It is proved that the improvement of relations of ownership must be achieved by the formation of a rational structure of ownership and low cost, high quality legal framework, an effective control system, high-quality regulatory framework, improve the competitiveness of domestic production
Wave packet dynamics in a monolayer graphene
The dynamics of charge particles described by Gaussian wave packet in
monolayer graphene is studied analytically and numerically. We demonstrate that
the shape of wave packet at arbitrary time depends on correlation between the
initial electron amplitudes and on the
sublattices and correspondingly (i.e. pseudospin polarization). For the
transverse pseudospin polarization the motion of the center of wave packet
occurs in the direction perpendicular to the average momentum . Moreover, in this case the initial wave packet splits
into two parts moving with opposite velocities along . If the
initial direction of pseudospin coincides with average momentum the splitting
is absent and the center of wave packet is displaced at along the same
direction. The results of our calculations show that all types of motion
experience {\it zitterbewegung}. Besides, depending on initial polarization the
velocity of the packet center may have the constant component ,
where is the Fermi velocity and is a function of
the parameter ( is the initial width of wave packet). As a result,
the direction of the packet motion is determined not only by the orientation of
the average momentum, but mainly by the phase difference between the up- and
low- components of the wave functions. Similar peculiarities of the dynamics of
2D electron wave packet connected with initial spin polarization should take
place in the semiconductor quantum well under the influence of the Rashba
spin-orbit coupling.Comment: 7 pages, 8 figures, to be published in Phys. Rev.
Wave packet dynamics in hole Luttinger systems
For hole systems with an effective spin 3/2 we analyzed analytically and
numerically the evolution of wave packets with the different initial
polarizations. The dynamics of such systems is determined by the
Luttinger Hamiltonian. We work in the space of arbitrary superposition of
light- and heavy-hole states of the "one-particle system". For 2D packets we
obtained the analytical solution for the components of wave function and
analyzed the space-time dependence of probability densities as well as angular
momentum densities. Depending on the value of the parameter ( is
the average momentum vector and is the packet width) two scenarios of
evolution are realized. For the initial wave packet splits into two
parts and the coordinates of packet center experience the transient
oscillations or {\it Zitterbewegung} (ZB) as for other two-band systems. In the
case when remains
almost cylindrically symmetric and the ripples arise at the circumference of
wave packet. The ZB in this case is absent. We evaluated and visualized for
different values of parameter the space-time dependence of angular momentum
densities, which have the multipole structure. It was shown that the average
momentum components can precess in the absence of external or effective
magnetic fields due to the interference of the light- and heavy hole states.
For localized initial states this precession has a transient character.Comment: 9 pages, 8 gigur
Опыт применения нетрадиционных удобрений при выращивании сеянцев сосны обыкновенной (Рinus sylvestris l.) на Урале)
Представлена информация о возможности использования нетрадиционных удобрений, которые приготовлены на основе отходов производств. В настоящее время они являются доступными, недорогими и высокоэффективными средствами повышения плодородия лесных почв. Проанализированы изменения параметров посадочного материала при внесении данных смесе
Zooplankton communities of the lena river delta (Siberia, Russia)
© SGEM2016.The article represents the current status of zooplankton communities in different types of water bodies of the Lena River Delta (The Republic of Sakha (Yakutia)), Eastern Siberia, Russia. Zooplankton species compositions have been investigated in each of thermokarst and polygonal lakes of the areas of study. The diversity of zooplankton species was clearly dominated by representatives of the type of Rotifera. On the other hand, Cladocera and Copepoda species were represented approximately in equal proportions. The abundance of Rotifera was higher in zooplankton communities. The zooplankton abundance was determined by rotifers, the biomass – by Copepods. The main species complex consisted of Kellicottia longispina, Keratella cochlearis, Conochilus unicornis, Eudiaptomus graciloides, Cyclopos genera and juvenile cladocerans. The reservoirs were characterized as clean or moderately polluted and oligosaprobic with deviation in β-mezosaprobic zone. The communities were dominated by widespread zooplankton species where Holarctic and Palearctic organisms were presented approximately in equal proportions. According to biotopic distribution eurytopic species represent half of all the specific composition, planktonic and littoral species we re presented in equal proportions. Zooplankton communities in thermokar st lakes we re more similar to themselves than the thermokarst and polygonal waterbodies’ zooplankton communities. There wa s clearly seasonality in dominance of zooplankton species and their association with a type of the water body
Magnetic Resonance (MR) rectography in diagnostics of small-size rectal neoplasms
Purpose was the assessment of diagnostic efficiency of MR-rectography in diagnostics of small-size rectal neoplasms. 12 patients with polyps and small tumors of a rectum are examined, the size of detected neoplasms varied in the range 3-18 mm. Native MRI and MRI with retrograde contrasting by ultrasonic gel was carried out. Results of MRI are compared with results of videocolonoscopy. Sensitivity of native MRT was 24%, MR- rectography was 88%. MR-rectography can be used in diagnostics of small-size rectal neoplasms
The educational crisis as reflected in Russian literature in the 20th century
On the threshold of the 21st century, we are witnessing unprecedented demand for higher education, which plays one of the central and crucial roles in the modern world: education is the only "instrument" that translates any nation's spiritual achievements; it facilitates the development of a profound and harmonious personality: a person who is capable of seeking out and mastering new knowledge, thinks creatively, and makes outside-the-box decisions, which is the keystone of the country's future social-cultural and economic development. Thus, changes in political, economic, and social establishments define the need for reforming the entire public consciousness and, above all, education as one of the fundamental spheres of human life. The culture crisis that broke out in the early 20th century is associated with the devaluation of common values
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