46,146 research outputs found
Hierarchic Models of Turbulence, Superfluidity and Superconductivity
New models of Turbulence, Superfluidity and Superconductivity, based on new
Hierarchic theory, general for liquids and solids (physics/0102086), have been
proposed. CONTENTS: 1 Turbulence. General description; 2 Mesoscopic mechanism
of turbulence; 3 Superfluidity. General description; 4 Mesoscopic scenario of
fluidity; 5 Superfluidity as a hierarchic self-organization process; 6
Superfluidity in 3He; 7 Superconductivity: General properties of metals and
semiconductors; Plasma oscillations; Cyclotron resonance; Electroconductivity;
8. Microscopic theory of superconductivity (BCS); 9. Mesoscopic scenario of
superconductivity: Interpretation of experimental data in the framework of
mesoscopic model of superconductivity.Comment: The background of this paper was published in American Institute of
Physics Proceedings, v.573, 181-200, 2001. http://www.karelia.ru/~alex
Management of Widespread Pain and Fibromyalgia
Peer reviewedPublisher PD
Skin ageing
Cutaneous ageing manifests itself as a progressive reduction in maximum function and reserve capacity of skin tissue. It is not a unique and uniform biological event. Skin comprises three layers: epidermis, dermis and subcutaneous tissue. Collagen atrophy is a major factor in skin ageing. There is a strong correlation between skin collagen loss and estrogen deficiency due to the menopause. Skin ageing, especially in the face, is associated with a progressive increase in extensibility and a reduction in elasticity. With increasing
age, the skin also becomes more fragile and susceptible to trauma, leading to more lacerations and bruising. Furthermore, wound healing is impaired in older women. Estrogen use after the menopause increases collagen content, dermal thickness and elasticity, and it decreases the likelihood of senile dry skin. Large-scale clinical trials are necessary to help make informed recommendations regarding postmenopausal estrogen use and its role in the prevention of skin ageing.peer-reviewe
تفكيك اثرات منشأ شوكهاي نفتي بر همبستگی پویای بین رشد بخش صنعت و معدن و قیمت نفت خام در ایران
This paper evaluates dynamic correlation between growth of Industry and Mine sector and crude oil price in Iran over the period of 1367:1 to 1389:4, with emphasis on the origin of oil price shocks. We apply Dynamic Conditional Correlation (DCC) model to estimate dynamic correlation. Our results show that demand-side shocks have increasing effects on the correlation between two variables. Also, precautionary demand shocks, except September 11 terrorist attack, have positive effect on the growth of Industry and Mine sector and effecton the correlation between growth of Industry and Mine sectorin the same direction with oil price shocks. Supply-side shocks have positive effect on growth of Industry and Mine sector and the same direction with oil price changes on correlation between two variables
The role of Eag and HERG channels in cell proliferation and apoptotic cell death in SK-OV-3 ovarian cancer cell line.
The voltage gated potassium (K+) channels Eag and HERG have been implicated in the pathogenesis of various cancers, through association with cell cycle changes and programmed cell death. The role of these channels in the onset and progression of ovarian cancer is unknown. An understanding of mechanism by which Eag and HERG channels affect cell proliferation in ovarian cancer cells is required and therefore we investigated their role in cell proliferation and their effect on the cell cycle and apoptosis of ovarian cancer cells
Modeling Momentum-Diffusion in the Solar Wind
Energetic particles accelerated by large solar flares and coronal mass ejections (CMEs) are a threat to astronauts, global positioning systems (GPS), radio communications, and power grids. It is therefore vital that scientists be able to predict how such particles move and gain energy within the interplanetary medium in order to forewarn society impending hazards so that mitigating actions can be taken. In this work, I take a step towards this goal, using the Energetic Particle Radiation Environment Module (EPREM) code, which is used by UNH\u27s radiation-dosage predictions website, I model interstellar-pickup ions (PUIs). I add to the model by including a momentum-diffusion term which contributes to the change in the distribution as it evolves in time. Here, I investigate how the given model of momentum diffusion affects the energetic PUI population (). This analysis focuses on the power-law spectra of the suprathermal tail of the PUI distribution. When the velocity dependence of the diffusion coefficient is normalized to the local solar-wind velocity, I have found little to no change in the spectra of the suprathermal ion tails when momentum-diffusion is included; however, when the velocity dependence of the diffusion coefficient is not normalized, hardening of the spectra of the suprathermal ion tail is observed. It is possible that the effect of momentum-diffusion and particle acceleration in CIRs is the source of the energetic seed particle population, which makes up the available particles to be accelerated by a shock. In order to understand these potentially dangerous seed particles, we hope to use new observations from Parker Solar Probe to determine the acceleration processes, such as momentum-diffusion, that yield the observed spectra
Two Notes on Exchange Rate Rules and on the Real Value of External Debt
This report presents two unrelated, short papers on exchange rate rules and on the real value of the external debt. The paper on exchange rate policy uses the Taylor model of overlapping, long term wage contracts to ask whether accommodating or PPP oriented exchange rate policies tend to stabilize output. In earlier work I had shown that exchange rate indexing, while destabilizing prices enhances the stability of output. The result is qualified hereby showing that the exchange rate not only affects aggregate demand directly but operates also, through the cost of imported intermediates, on the price level. It is shown that unless monetary policy is sufficiently accommodating this latter effect may dominate with the consequence that increased exchange rate indexation reduces output stability .The paper on the real value of external debt poses the question how to integrate external debt holdings in the traditional framework used to evaluate the effects on real income of changes in world prices. It is shown that integrating debt service liabilities in a comprehensive income measure makes real disposable income equal to the value of output less the real value of real interest payments on the external debt. Furthermore, with the CPI being the appropriate deflator for foreign debt, a rise in export prices raises income in proportion to exports while a rise in import prices lowers real income in proportion to Imports. The proper accounting of debt in a comprehensive income framework, noting the intertemporal budget constraints, thus restores the conventional treatment of the income effects of price changes.
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