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Silchar, India

Assam University is a teaching-cum-affiliating university. The university has sixteen schools which offer Social science, Humanities, Languages, Life science, Physical science, Environmental science, Information science, Technology and Management Studies. There are 35 departments under these sixteen schools. The five districts under the jurisdiction of Assam University have 56 undergraduate colleges. Assam University is an institutional signatory to the Global Universities Network for Innovation , Barcelona and United Nations Global Compact for its commitment to educational social responsibilities.The main campus, in an area of 600 acres , is located at Dargakona, about 20 km from Silchar, while a second campus of the university is at Diphu, in the Karbi Anglong district. Wikipedia.

Gupta A.,Assam University
American Journal of Environmental Sciences

Problem statement: The South and South East Asian countries are characterized by their rich biodiversity as well as cultural diversity. Agricultural expansion for livelihood security is leading to an increase in pesticide application in this region. It has been observed that because of the hot and humid conditions prevalent in this region, most farmers and pesticide applicators do not use proper protective gear, thereby exposing themselves to the hazards of pesticide poisoning. Another important issue is the exposure of infants and children to toxic pesticides, especially in congested urban slums and tenements. Approach: The biodiversity contained in the six biodiversity hotspots located in this region was also at considerable risk from the toxic effects of pesticides from agricultural fields as well as plantations of tea, coffee, rubber, oil palm, which were often present in close proximity of protected areas. Though a large number of countries in this region had ratified and/or signed important international conventions on pesticide manufacture, export-import and trans boundary movements such as the Stockholm, the Rotterdam and the Basel conventions. Results: A large number of hazardous pesticides was still in use in this region and require to be phased out. Information was lacking on the use status of several pesticides in smaller countries, thereby retaining a certain amount of ambiguity. Conclusion: Despite the grave nature of the pesticide use regulation issue in the Asia-Pacific, clear and uniform policy response is lacking in most countries of this region. These issues need to be addressed through dialogues and mutual cooperation both at national as well as international levels. © 2012 Science Publications. Source

Prasanna Kumar G.V.,Assam University
Biosystems Engineering

In the vertical longitudinal plane of a tractor, the three-point hitch system is a six-bar mechanism that can be designed and modelled as two distinct four-bar linkages sharing two links. A Newton-Raphson solution for the four-bar linkage has been applied to a three-point hitch system of tractor to determine the range of movement of the lift arm and generate the path of motion of lower and upper hitch points in the movement range of the hitch. The algorithm was executed as a program in MATLAB. The program has the ability to generate the path of motion of lower; upper and virtual hitch points, determine the geometric performance parameters of the hitch system, and identify the variations in the quality of force transmission by the linkage system throughout the range of hitch movements for 165 different groups of hitch dimensions available in the Nebraska tractor test reports. Application of the program for searching improved design solutions for the existing hitch system of a tractor was demonstrated. The program has the potential to be used in any search-based techniques for optimisation of the dimensions of three-point hitch systems for tractors. In addition, variations in length of links and spatial location of their pivot points were studied for various categories of hitches. The range of values of link lengths and the spatial location of their pivot points reported here can be used for defining the design space during the optimal dimensional synthesis of tractor three-point hitch systems. © 2012 IAgrE. Source

Mondal N.,Assam University
Journal of Nepal Paediatric Society

Background: Undernutrition is a major public health concern in many of the developing countries of Asia. Due to immense population size, socioeconomic disparities, illiteracy and inadequate access to health facilities prevalence is very high in India. The objective of this study was to determine the prevalence of age-sex specific thinness (low BMI-for-age) among adolescents residing in rural regions in India. Materials and Methods: This cross-sectional study has conducted among 1165 adolescent (602 boys; 563 girls) aged 10-18 years of Darjeeling district, West Bengal, India. Anthropometric measurements were height and weight obtained and BMI (weight/height2, kg/ m2) was calculated. The prevalence of thinness was assessed using newly proposed age-sex specific cut-offs of Cole et al. The data were analyzed using chi-square, ANOVA and Least Mean and Square (L,M and S) model approach. Results: Prevalence of overall thinness is 49.10% (51.16% boys, 46.89% girls) among rural adolescents. The boys are found to be more sufferer than girls in the different thinness grades include mild (grade I; 27.41% vs. 27.11%), moderate (grade II; 14.62% vs. 12.08%) and severe (grade III; 9.14% vs. 8.70%) (p>0.05). The age and sex specific smooth percentile curves of BMI were derived using L,M and S model approach for further evaluation of nutritional status. Conclusion: The existence of high prevalence of thinness among adolescents indicates nutritional deprivation among rural Indian adolescents. There is an urgent need of appropriate nutritional intervention program to address the public health problem related to undernutrition especially among nutritionally vulnerable segments of adolescents residing in rural regions to ameliorate the nutritional status. Source

Nanocellulose is an emerging sustainable biomaterial with exceptional physicochemical properties. It can be isolated from inexpensive renewable cellulosic biomass and a number of natural plant fibers have been extensively investigated as a source for such isolation. The geometrical dimensions of the prepared cellulose nanocrystals (CNCs) are however, found to vary widely, depending on the source of the cellulosic material and hydrolysis conditions. CNCs are biocompatible and biodegradable which exhibit very low cytotoxicity thus, offering a wide range of opportunities for biomedical applications. By surface modification of nanocellulose, various functional materials with tunable properties can also be developed. Over the past two decades, CNCs have garnered a significant interest as biobased reinforcing nanofiller material. This mini review will provide an overview into the production methods, sources of cellulosic fibers, surface modification strategies and drug delivery applications of the chemically or mechanically isolated nanocellulose. © 2015 Bentham Science Publishers. Source

Hydrophobic photoluminescent carbon nanodots (CNDs) were fabricated by using citric acid and L-tyrosine precursor molecules through a simple, facile thermal oxidation process in air. These CNDs (less than 4 nm in size) exhibited a characteristic excitation wavelength dependent emission and upconversion emission properties and are insoluble in water, but soluble in organic solvents. FTIR and 1H NMR analyses showed a selective participation of L-tyrosine molecule during the carbonization process at 220 oC without a disturbance of its benzylic protons and aromatic phenyl ring bearing hydroxy group. TEM and XRD studies revealed a quasi-spherical morphology and poor-crystalline nature of CNDs. Because the presence of the hydroxy group of L-tyrosine is dominating at the surface, these CNDs are also soluble in water under basic conditions. The effects of base and silver nanoparticles on the luminescence properties of CNDs were studied and a quenching of fluorescence was observed. These tyrosine-passivated CNDs are applicable for both biologically and commercially. © 2014 Gude. Source

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