148 research outputs found
A study to assess the nursing problems and outcome of inpatients with acute coronary syndrome in cardiology medical unit, SCTIMST.
No full textPolyaniline doped with orthophosphoric acid - A material with prospects for optoelectronic applications
No full textPolyaniline (PANI) is one of the highly pursued conducting polymers in recent times owing to its excellent electrical and optical properties, better air stability and easy and cheap synthesis route. Doped PANI has been extensively investigated as a hole-injecting electrode in polymer light en-fitting diodes (LEDs). However, the work on doped PANI as emissive layers in polymer LEDs is quite scanty. Though there are reports on the photoluminescence characteristics of doped PANI, a detailed investigation on a comparative study of the photo luminescence in PANI doped with different dopants, which is the essence of our work, has not been carried out earlier. In the present work, we compare the photoluminescence (PL) emission intensity of PANI doped with hydrochloric acid (HCl), camphor sulphonic acid (CSA) and orthophosphoric acid, with a view to assessing the prospects of doped PANI as emissive layer in polymer LEDs. The PL emission peak is centered around 450 nm when excited at 365 nm. PANI doped with orthophosphoric acid exhibits the highest photoluminescent intensity followed by PANI doped with HCl and CSA. A comparison of the X.R.D spectra of the samples show that both HCl doped PANI and CSA doped PANI, do not show any significant crystalline nature whereas orthophosphoric acid doped PANI exhibits considerable crystallanity. The observed long-range order in orthophosphoric acid doped PANI could be a consequence of the more orderly arrangement of benzenoid and quinonoid units, resulting in enhanced PL emission intensity. (C) 2007 Elsevier B.V. All rights reserved
Enhanced luminescence observed in polyaniline-polymethylmethacrylate composites
No full textPolyaniline (PANI) is one of the highly pursued conducting polymers owing to its high electrical conductivity, interesting optical properties and excellent environmental stability. Recently, it is also being used extensively as hole-injecting electrodes in polymer LEDs. Inspite of its excellent electrical properties, the mechanical strength and processibility are not very attractive. It is reported that making composites of PANI with conventional polymers such as polymethylmethacrylate (PMMA), significantly improves the mechanical strength and processibility. Recently, we have observed that the DC electrical conductivity of HCl doped PANI can be further enhanced by making composites with PMMA. PMMA has been reported to have excellent optical properties such as very good transparency in the visible region and fairly good photoluminescence emission. This prompted us to carry out investigations on the optical properties of this composite, especially the photoluminescence characteristics. In the present work, we have synthesized PANI-PMMA composites using bulk polymerized PMMA. The FTIR spectrum reveals that PANI has been dispersed as an interpenetrating network in the PMMA matrix. The change in the photoluminescence (PL) behaviour of PANI-PMMA composites with different aniline to PMMA feed ratios has been investigated. It is observed that the photoluminescence intensity increases with increase in the PMMA content in the composite, possibly due to greater chances of exciton formation and subsequent radiative decay to the ground state. The PL spectrum of PMMA is also taken for comparison. The enhancement in the PL intensity of the composites with increase in the aniline to PMMA feed ratio is quite comparable with the enhancement in the DC electrical conductivity of these composites. (c) 2006 Elsevier B.V. All rights reserved
Investigations on the growth and characterization of l-citrulline oxalate monohydrate single crystal
No full textDevelopment of solid polymer electrolytes for applications in all solid state energy storage devices with high energy density and improved safety
No full text
Modified model for shear stress distribution using TRI-1 Lunar soil simulant
No full textIn the present study, research is carried out on deriving modified analytical equations for finding shear stress distribution and known as Modified Shear Stress models (SSM) beneath plain wheels (small and large) on TRI-1 lunar soil simulant. In all four models, the Reece model, Bekker model, Wong-Reece model and Iagnemma model, normal stress and shear stress are determined, and the shear stress determination is based on the Janosi and Hanamoto (1961) model. There exists ample scope for modifying this model. A modified model for shear stress distribution is developed and the same is discussed in this paper
Scientific Appraisal of Upaveshana Samskara and its role in Childhood Growth and Development
No full textIndian culture is the heritage and amalgamation of many cultures, ethical values, traditional customs and belief systems. As a part of this, varieties of Samskaras are being practiced in different areas and communities across India since vedic period. Ayurvedic literatures emphasize the importance of Samskaras which protect and promote the human wellbeing. Every Samskara brings continuous positive changes in Sareera (physical body) and Manas (mind). Samskaras to be performed are aligned in such a way as to mark the important developmental turns that the child takes in his life. Samskaras help to assess the normal development – Motor, Social and Speech domains, most importantly have a positive therapeutic effect in the development of the child. Upaveshana is one among Bala-Samskara (Samskaras performed during childhood) where after 6th month of age the baby is made to sit for the first time by following religious rituals. It has a strong impact on Anatomical, Physiological and Cognitive development of the child as it is said that “Posture support improves object individuation in infants”. This article is an effort to analyze and interpret the clinical significance of Upaveshana Samskara in detail and also the need of awareness regarding the importance of Samskaras in the present era
On the prospects of polyaniline and polyaniline/MWNT composites for possible pressure sensing applications
No full text
- …
