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Search Results: 1 - 10 of 544211 matches for " M. N. Kamalasanan "
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New Organic Thin-Film Encapsulation for Organic Light Emitting Diodes  [PDF]
Rakhi Grover, Ritu Srivastava, Omwati Rana, D. S. Mehta, M. N. Kamalasanan
Journal of Encapsulation and Adsorption Sciences (JEAS) , 2011, DOI: 10.4236/jeas.2011.12003
Abstract: Organic Light-Emitting diodes (OLEDs) are extremely sensitive to water vapour and oxygen, which causes rapid degradation. Epoxy and cover glass with large amount of desiccant are commonly applied to encapsulate bottom emitting OLEDs which is not a viable option for flexible as well as top emitting OLEDs. This paper reports a completely organic encapsulating layer consisting of four periods of alternate stacks of two organic materials with different morphologies deposited by simple vacuum thermal evaporation technique. Standard green OLED structures with and without encapsulation were fabricated and investigated using structural, optical and electrical studies. Moreover, the encapsulation presented being organic is safe for underlying organic layers in OLEDs and is ultrathin, transparent and without any cover glass and desiccant, ensuring its application in flexible and top emitting OLEDs.
Effect of charge carrier relaxation during hopping process on electroluminescence in organic solids
Arunandan Kumar,Priyanka Tyagi,Ritu Srivastava,M. N. Kamalasanan
Physics , 2014,
Abstract: Energetic disorder in disordered organic solids has been found to alter their physical parameters. Here, we have demonstrated, by means of Monte-Carlo simulation and experiments, that the electroluminescence (EL) spectrum is dependent on energetic disorder. This dependence has been attributed to the charge carrier relaxation during hopping process. The dependence of EL spectrum on energetic disorder makes it temperature dependent and temperature dependence has been found to vary with energetic disorder in a variety of materials. The simulation has been performed by taking the relaxation of charge carriers via transport energy in the Gaussian density of states. An analytical equation was established for spectral shift as a function of transport energy.
Migration Status and Prevalence of Chronic Diseases in Kerala State, India
Safraj Shahul Hameed,Vellapallil Raman Kutty,Krishnapillai Vijayakumar,Ajayan Kamalasanan
International Journal of Chronic Diseases , 2013, DOI: 10.1155/2013/431818
Abstract: Aim. To study the relationship between a personal history of migration and prevalence of chronic diseases and risk factors in a rural population. Method. Cross sectional survey data from PROLIFE, a cohort study involving the long time follow-up of the residents of an administrative unit in Kerala, India, was used. Pre-tested questionnaire was administered to 78,173 adult residents. Information on physician diagnosed diabetes, hypertension, and cardiac diseases and lifestyle attributes like physical activity, habits, and migration was captured. Results. Subjects with a history of migration had a higher prevalence of chronic disease when compared with those with no history of migration. Diabetes (19.6% versus 4.1%), hypertension (18.8% versus 6.6%), and cardiac complaints (8.6% versus 4.1%) are more prevalent among those with history of migration of over 5 years. After adjustment for age, gender, and education, we found that chronic diseases are higher among persons with a history of migration (OR 2.2, 95% CI: 2.1–2.3). Age-specific increases in prevalence of chronic diseases are also substantially higher among migrants. Conclusion. People with a history of migration have a higher prevalence of chronic diseases and risk factors. 1. Introduction Migration is a process of social change during which people move from one cultural setting to another in order to settle for a longer period of time or permanently [1]. Though migration has been occurring since the beginning of time, the advent of the era of globalization has resulted in the increased movement of people across and within national boundaries for various reasons. The social, cultural, financial, and other aspects of migration have been the focus of much research and many new policies initiated as a result. The relationship between migration and health has also been well explored. However, there is a lack of consistency among studies of migration and health with results indicating both higher and lower prevalence of diseases among migrants in relation to the residents [1–9]. The health status of return migrants, migrants, who have returned to their place of origin, has not been the focus of much research. A study from Mexico had previously reported on the disadvantages faced by the return migrants [10]. More research is needed in this area as the health status of the return migrants may be much different from that of the resident community. In this exploratory study, we address this information gap by studying a rural community in the south Indian state of Kerala which has a long history of migration.
The Oleic Acid Composition Effect on the Carboxymethyl Cellulose Based Biopolymer Electrolyte  [PDF]
M. N. Chai, M. I. N. Isa
Journal of Crystallization Process and Technology (JCPT) , 2013, DOI: 10.4236/jcpt.2013.31001
Abstract:

Biopolymer electrolyte based on carboxymethyl cellulose has been prepared by doping with different concentration of oleic acid via solution casting technique. Fourier Transform Infrared spectroscopy was used to study the complexation between the salt and polymer. New peak was observed at 1710, 2850, 2920 cm-1. X-ray diffraction study reveals the amorphous nature of the biopolymer electrolyte. Impedance study shows the highest ionic conductivity, σ, was found to be 2.11 × 10-5 S·cm-1 at room temperature (303 K) for sample containing 20 wt.% of oleic acid and the biopolymer electrolyte obeys Arrhenius behaviour.

An Empirical Investigation into the Effect of Financial Sector Development on Consumption and Inflation in Nigeria: 1986-2012  [PDF]
M. N. G. Omofa
Open Journal of Business and Management (OJBM) , 2017, DOI: 10.4236/ojbm.2017.51002
Abstract: Private consumption expenditure is one of the largest components of aggregate expenditure in Nigeria. It constitutes about 72% of GDP over the period understudy. It is therefore an important aspect of the macro-economy of any nation. In the same vein inflation has been a persistent evil affecting the economy of Nigeria. So they are both required to have a deep understanding of how macro-economy functions. The determinants of these two aggregates can therefore not be divorced from the activities in the financial sector. Hinging on the Keynesian absolute income consumption hypothesis, the paper used 3 SLS to estimate the two macroeconomic equations. The results showed that money supply, market capitalization and exchange rate had positive impact on personal consumption expenditure. However, it is only market capitalization that is not statistically significant. All the financial variables used—money supply, interest rate and exchange rate had positive relationship with the general price level. However it was only exchange rate that was not statistically significant. The paper concluded that shocks in the financial sector explained the variations in personal consumption and inflation. It was therefore recommended that interest rate and exchange rate should not be absolutely left to the dictate of the market forces. Government should intervene occasionally as the case may demand. Conducive environment that will make activities in the capital market should be encouraged.
An Assessment of the Effect of Financial Sector Development on Growth and Unemployment in Nigeria: 1986-2012  [PDF]
M. N. G. Omofa
Open Journal of Business and Management (OJBM) , 2017, DOI: 10.4236/ojbm.2017.51004
Abstract: Parts of the major macroeconomic objectives of any nation are attaining high growth and employment rates. However these constitute major challenges in Nigeria as economic growth has either remained stunted or stagnant and unemployment rate very high. The financial sector is expected to push up the real sector thereby lowering unemployment rate. It is within this supply leading hypothesis that this work is situated. The 3 Stage Least Square method was used in estimating the Growth and Unemployment macroeconomic equations. The results showed that interest rate and exchange rate have effects on growth but only exchange rate was statistically significant. This seems to suggest that there is a disconnection between the Nigerian money market and the real sector. However interest rate and exchange rate were significant in influencing the rate of unemployment in Nigeria. The goodness of fits for each of the two equations was high. The simulation results showed that the shock in the financial sector has serious implications for the economic growth and unemployment. The work therefore suggests that interest rate and exchange rate should not be left absolutely to the dictate of the market forces. Occasionally government should intervene in these markets as the time requires.
Influence of Angle Ply Orientation on Tensile Properties of Carbon/Glass Hybrid Composite  [PDF]
M. N. GuruRaja, A. N. HariRao
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2013, DOI: 10.4236/jmmce.2013.15036
Abstract: Hybrid composites are considered materials of great potential for engineering applications. One advantage of hybrid composite materials for the designer is that the properties of a composite can be controlled to a considerable extent by the choice of fibers and matrix and by adjusting the orientation of the fiber. The scope for this tailoring of the properties of the material is much greater, however, when different kinds of fiber orientations are incorporated in the same resin matrix. For the study of potential of these materials, in this work specimens were prepared with different angle ply ori entation of carbon/glass hybrid with epoxy resin as an adhesive. Three orientations viz 0°/90°, 45°/45° and 30°/60° were considered for studies. Mechanical properties such as tensile strength, tensile modulus, & peak load of the hybrid com posites were determined as per ASTM standards. Vacuum bagging technique was adopted for the fabrication of hybrid specimens. It was observed that angle ply orientation at 0°/90° showed significant increase in tensile properties as compared to other orientation. Scanning electron micrographs of fractured surfaces were used for a qualitative evaluation of interfacial properties of woven carbon-glass hybrid composites. These results indicated that carbon-glass hybrid composites offered the merits of synthetic fibers.
Approaches to Delivery of Care at Home Following Elective Hip and Knee Joint Replacement Surgery  [PDF]
M. Alnaib, N. R. Agni, N. Shaw
Open Journal of Therapy and Rehabilitation (OJTR) , 2015, DOI: 10.4236/ojtr.2015.33013
Abstract: Arthritis has a worldwide increasing prevalence with increased demands on healthcare systems to provide arthroplasty surgery. There is growing evidence that early discharge and rehabilitation at home following hip and knee replacement provide similar or better results in function, complication rates and patient satisfaction. We suggest that this method of rehabilitation is a cost-effective viable option in fitter patients whose medical demands will be low postoperatively.
Dynamic Changes in Lipid Peroxidation and Antioxidant Level in Rat’s Tissues with Macrovipera lebetina obtusa and Montivipera raddei Venom Intoxication  [PDF]
N. A. Zaqaryan, N. A. Ghazaryan, N. M. Ayvazyan
Journal of Biophysical Chemistry (JBPC) , 2014, DOI: 10.4236/jbpc.2014.54017
Abstract: We investigated the balance of free radicals in different tissues (liver, heart, brain and muscle) of rats in course of in vivo and in vitro processing by Macrovipera lebetina obtusa (MLO) and Montivipera raddei (MR) snake venoms. Chemiluminescence (ChL) levels were examined in tissue assays after incubation (at 37 °C for a period of 10 min) with venom for in vitro experiments and in tissue assays isolated of 10 min after venom injection for in vivo experiments. The TBA-test was also performed to confirm the free radical expression. The activities of antioxidant enzymes (such as superoxide dismutase and glutathione peroxidase) in isolated tissues were detected by spectro-photometry. During the in vitro processing chemiluminescence levels of tissue homogenates significantly decreased, while in course of in vivo intoxication the level of ChL was elevated in brain and liver; lipid peroxidation also increased in brain tissue, but there was no significant balance change in other tissues; the activity of superoxide dismutase mainly correlated with changes of free radical balance during intoxication. On the contrary, the activity of glutathione peroxidase showed the reverse tendencies to change. We suggest that free radicals and their oxidative stresses may play a role in the early stage of intoxication causing the so-named “spreading-effect”, which is very characteristic for the venom of vipers.
Some New Particles beyond the Standard Model  [PDF]
H. M. M. Mansour, N. Bakheet
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.25008
Abstract:

In this work a simulated B-L model at Large Hadrons Collider is presented using Monte Carlo si- mulation software. B-L model is one of the scenarios proposed to add an extension of the standard models. B-L model predicts the existence of three new particles at the LHC. They are a new neutral massive gauge boson, three heavy neutrinos and a heavy Higgs boson.


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