Heat Transfer in Boundary Layer Viscolastic Fluid Flow Over Anexponentially Stretching Sheet

The paper presents the study of momentum and heat transfer characteristics in a visco-elastic boundary layer fluid flow over an exponentially stretching continuous sheet with non-uniform heat source. The flow is generated solely by the application of two equal and opposite forces along the x-axis such that stretching of the boundary surface is of exponential order in x and influenced by uniform magnetic field applied vertically. The non-linear boundary layer equation for momentum is converted into ordinary differential equation by means of similarity transformation. Approximate analytical similarity solutions is obtained for the dimensionless stream function and velocity distribution function after transforming the boundary layer equation into Riccati type and solving it sequentially. Heat transfer equation is then solved using Runge-Kutta fourth order method. The accuracy of the analytical solutions is also verified by comparing the solutions obtained to those in literature when Hartmann number is zero. The effects of various physical parameters on velocity, skin friction, temperature and Nusselt number profiles are presented graphically

Distributed storage manager system for synchronized and scalable AV services across networks

This article has been made available through the Brunel Open Access Publishing Fund - Copyright @ 2011 Hindawi Publishing CorporationThis paper provides an innovative solution, namely, the distributed storage manager that opens a new path for highly interactive and personalized services. The distributed storage manager provides an enhancement to the MHP storage management functionality acting as a value added middleware distributed across the network. The distributed storage manager system provides multiple protocol support for initializing and downloading both streamed and file-based content and provides optimum control mechanisms to organize the storing and retrieval of content that are remained accessible to other multiple heterogeneous devices

Dengue: experience from a tertiary care centre in Northern Karnataka, India

Background: Epidemiology of dengue infection is evolving, and research gap exists in the region. The clinical features, laboratory parameters, complications and treatment outcomes of patients diagnosed of dengue infection at a tertiary care centre were analysed in the present study.Methods: More than 12 years old patients, presenting with features suggestive of acute febrile illness were subjected to detailed history taking and thorough clinical examination. All the suspected cases were further evaluated with complete blood count, liver function test, kidney function test, along with ultrasonography of abdomen. Blood samples were tested for dengue antibodies (IgG and IgM) by hemagglutination inhibition method for confirmation of the diagnosis. The clinical course was closely monitored during hospital stay and complications and deaths, if any, were noted.Results: Total 140 patients were studied. Fever (100%), headache (80%) and myalgia (73.6%) were the commonest symptoms. Thrombocytopenia (136, 97.1%) was the commonest hematological finding, while severe thrombocytopenia (<50,000/cu. mm) was observed in 38 (27.1%) cases. Hepatomegaly (61, 43.6%), splenomegaly (42, 30.0%), ascites (54, 38.6%), pleural effusion and gall bladder edema (18, 12.9% each) were the commonest findings on ultrasonography. Shock and ARDS were the major complications.Conclusions: Dengue remains an important public health problem even at a tertiary care centre and strong suspicion is needed in adult patients with acute febrile illness. The management should focus on averting shock and ARDS, which would help in larger aim of reduction in mortality

A review on solar cells from Si-single crystals to porous materials and quantum dots

AbstractSolar energy conversion to electricity through photovoltaics or to useful fuel through photoelectrochemical cells was still a main task for research groups and developments sectors. In this article we are reviewing the development of the different generations of solar cells. The fabrication of solar cells has passed through a large number of improvement steps considering the technological and economic aspects. The first generation solar cells were based on Si wafers, mainly single crystals. Permanent researches on cost reduction and improved solar cell efficiency have led to the marketing of solar modules having 12–16% solar conversion efficiency. Application of polycrystalline Si and other forms of Si have reduced the cost but on the expense of the solar conversion efficiency. The second generation solar cells were based on thin film technology. Thin films of amorphous Si, CIS (copper–indium–selenide) and t-Si were employed. Solar conversion efficiencies of about 12% have been achieved with a remarkable cost reduction. The third generation solar cells are based on nano-crystals and nano-porous materials. An advanced photovoltaic cell, originally developed for satellites with solar conversion efficiency of 37.3%, based on concentration of the solar spectrum up to 400 suns was developed. It is based on extremely thin concentration cells. New sensitizer or semiconductor systems are necessary to broaden the photo-response in solar spectrum. Hybrids of solar and conventional devices may provide an interim benefit in seeking economically valuable devices. New quantum dot solar cells based on CdSe–TiO2 architecture have been developed

Coarse-grained simulations of flow-induced nucleation in semi-crystalline polymers

We perform kinetic Monte Carlo simulations of flow-induced nucleation in polymer melts with an algorithm that is tractable even at low undercooling. The configuration of the non-crystallized chains under flow is computed with a recent non-linear tube model. Our simulations predict both enhanced nucleation and the growth of shish-like elongated nuclei for sufficiently fast flows. The simulations predict several experimental phenomena and theoretically justify a previously empirical result for the flow-enhanced nucleation rate. The simulations are highly pertinent to both the fundamental understanding and process modeling of flow-induced crystallization in polymer melts.Comment: 17 pages, 6 eps figure

Influenza Virus Not cRAFTy Enough to Dodge Viperin

Interferons elicit antiviral responses by inducing the expression of a large number of host cell genes. In this issue of Cell Host & Microbe, Wang and colleagues report that the interferon-inducible protein viperin inhibits influenza A virus release by impairing the formation of cholesterol-enriched plasma membrane microdomains, or lipid rafts. Viperin appears to disrupt lipid rafts by suppressing the activity of farnesyl diphosphate synthase, a key enzyme in isoprenoid biosynthesis

Early Miocene quantitative calcareous nannofossil biostratigraphy from the tropical Atlantic

A quantitative analysis of calcareous nannofossils was conducted on lower Miocene sediments from Ocean Drilling Program Hole 959A on the West African margin. Combined with data from previous investigations of the lower Miocene from the tropical Atlantic, this research identifies and tests the viability of markers used in current zonation schemes, identifies alternative markers for age boundaries, and examines statistically the most probable order of events in the lower Miocene with the use of the ranking and scaling method (RASC)