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Search Results: 1 - 10 of 764 matches for " Dinabandhu Sahoo "
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Study of Morphology and Agar Contents in Some Important Gracilaria Species of Indian Coasts  [PDF]
Nivedita Sahu, Dinabandhu Sahoo
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.412A2007

This study reports the morphological, anatomical and agar content difference among various species of Gracilaria. The cortex was found 1-2 layered in G. edulis and G. eucheumatoides whereas 5-6 layered in G. foliifera and G. crassa. The medulla was 6-8 layered in G. edulis, 10-11 layered in G. foliifera, 14-15 layered in G. eucheumatoides and 8-10 layered in G. crassa. Similarly, distinct variations were observed in the structure of cystocarp of these taxa. The outer pericarp was 6-8 layered in G. verrucosa (attached type), 8-9 in Graciriopsis megaspora, 12-13 layered cells in G

Actinomycetes from Soil of Lachung, a Pristine High Altitude Region of Sikkim Himalaya, Their Antimicrobial Potentiality and Production of Industrially Important Enzymes  [PDF]
Laishram Shantikumar Singh, Hemant Sharma, Dinabandhu Sahoo
Advances in Microbiology (AiM) , 2019, DOI: 10.4236/aim.2019.98046
Abstract: Investigations on actinomycetes are profoundly significant area of research since they form major resource for bioactive compounds, antimicrobials, anticancer agents, immunosuppressants, and biological control agents. A total of 59 actinomycetes were isolated from the soil sample collected from Domang, Lachung, North Sikkim, Sikkim, India. Out of the total isolates, 26 isolates with unique and distinct characteristic features were selected and analysed for antimicrobial activity as well as extracellular enzyme production. Out of 26 isolates, 17 (66%) isolates exhibited different level of growth inhibition against the test microorganism. 12 (47%) isolates showed antifungal activity and six (23%) isolates showed antibacterial activity. Most of the isolates showed antifungal activity. Isolate RCS260 was found to exhibit maximum growth inhibition (60%) against Colletotrichum gloeosporioides MTCC 8021. Isolate RCS252 showed maximum growth inhibition (67%) against Bacillus subtilis MTCC 441. Out of 26 isolates, 14 (54%) isolates exhibited chitinase activity, 25 (96%) isolates showed cellulase production, 20 (77%) isolates produced amylase enzyme and 17 (65%) isolates showed positive for protease activity. Potential isolate RCS260 has been characterized and identified as Streptomyces vinaceus strain RCS260 while isolate RCS252 was identified as Kitasatospora aburavienis strain RCS252. The antagonistic profile of strain RCS260 highlights its potential as antifungal agent against phytopathogens.
A Finite Element Study of Elastic-Plastic Hemispherical Contact Behavior against a Rigid Flat under Varying Modulus of Elasticity and Sphere Radius  [PDF]
Prasanta Sahoo, Biplab Chatterjee
Engineering (ENG) , 2010, DOI: 10.4236/eng.2010.24030
Abstract: The present study considers a finite element analysis of elastic-plastic axi-symmetric hemispherical contact for a frictionless deformable sphere pressed by a rigid flat. The material of the sphere is modeled as elastic perfectly plastic. Analysis is carried out to study the effect of varying modulus of elasticity and sphere radius in wide range of dimensionless interference until the inception of plasticity as well as in plastic range. Results are compared with previous elastic-plastic models. It is found that materials with Young’s modulus to yield strength (E/Y) ratio less than and greater than 300 show strikingly different contact phenomena. The dependency of E on dimensionless interference at which the plastic region fully covers the surface is observed. However with different radius, finite element study exhibits similar elastic-plastic phenomena.
Physicochemical and Biochemical Reclamation of Soil through Secondary Succession  [PDF]
Kamala Haripal, Sunanda Sahoo
Open Journal of Soil Science (OJSS) , 2013, DOI: 10.4236/ojss.2013.35028

Conversion of forest to agricultural fields has become a common practice in India. Very often these fields have been abandoned due to lack of sustainable production. In course of time these fallow lands undergo natural secondary succession. Present study was carried out to find out the restoration of soil physicochemical and biochemical properties in a chronosequence of 2 yr, 4 yr, 6 yr, 11 yr, and 15 yr fallow lands. Soil enzyme activities play key roles in the biochemical functioning of soils, including soil organic matter formation and degradation, nutrient cycling, and reflect the change in soil management and land use. There was gradual improvement in the physical condition and nutrient status along with increase in soil amylase, cellulase, dehydrogenase, phophatase, and urease activity in the present study with the progress of fallow age which indicates the importance of natural secondary succession in soil restoration. However the PCA analysis indicated that natural vegetational succession could reclaim the soil quality and promote ecosystem restoration but it required a long time under the present local climatic condition.

A Behavioral Economics Study on the Management Accountant’s Professional Networking Practices through Mobile Technologies  [PDF]
Ashish Varma, Subhransu Sahoo
Theoretical Economics Letters (TEL) , 2018, DOI: 10.4236/tel.2018.814192
Abstract: The objective of this study was to ascertain the management accountant’s (MA) usage of smartphone for professional networking purposes. The study was conducted during mid-2017 to mid-2018 using a partial least squares-structural equation modeling (PLS-SEM) technique. The study included a sample of 168 management accountants from India. The study found out that the enjoyment of professional networking activity (EPA) has a direct significant effect on the perceived value of smartphone professional networking service (PVSP) and that the perceived risk (PR) had a significant negative effect on the trust in advice acquired from a smartphone professional networking service (TCASP). As expected, privacy concerns (PC) had a significant direct effect on the perceived risks (PR). The PVSP had a direct positive effect on TCASP. Finally, it was observed that PR mediates the relationship between PC and TCASP. Thus, this study contributes by bringing new empirical insights on the actual usage of mobile technology for professional networking purposes in an emerging market context and has significant ramifications for providers of such services.
The Factors Impacting the Long Term Settlements and Its Counter Impact on the Industries  [PDF]
D. P. Sahoo
Theoretical Economics Letters (TEL) , 2019, DOI: 10.4236/tel.2019.94053
Purpose of the Study: This paper aims to study the impact of Long Term Settlements, (LTS) which are considered to be instrumental in maintaining long term harmonious industrial relations in the organizations, by the Actors of Industrial Relations. The critical role played by such an instrument had been accepted in the available literature on the subject. But on its control mechanisms of maintaining long term harmonious industrial relations, the existing literature provides a limited insight. Data/Methodology: This study utilized a qualitative methodology and makes use of the inputs received from the respondents interviewed on the impacts of LTS in the emerging industrial context and industrial relations dynamics. The data collected from the interview were outcome of the experience in dealing in the organizational contexts where an LTS is in execution between the Management and the Trade union. Findings: In LTS, the parties get involve in social dialogue (both the trade union and the management) while having their respective interest in the LTS which helps in generating alternatives consistent with their interests. The LTS are social process of emerging to mutually acceptable norms on the payment of wages to the workers by the management for specific return on business, which is regulated under a dynamic context. The social dialogue and collective bargaining are the instruments to LTS both for the Management and the trade union. This study is very practical in nature, and it provides important insight on the dynamics of LTS as an outcome of
Structural, microstructural, and thermal characterizations of a chalcopyrite concentrate from the Singhbhum shear zone, India
Ritayan Chatterjee,Shamik Chaudhuri,Saikat Kumar Kuila,Dinabandhu Ghosh
- , 2015, DOI: https://doi.org/10.1007/s12613-015-1065-3
Abstract: The structural and morphological characterizations of a chalcopyrite concentrate, collected from the Indian Copper Complex, Ghatshila, India, were carried out by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The concentrate powder was composed mainly of free chalcopyrite and low quartz in about 3:1 weight ratio. The particle size was about 100 μm. Spectroscopic studies (FTIR, Raman, UV-visible) of the concentrate supported the XRD findings, and also revealed a marginal oxidation of the sulfide phase. The energy band gap of the sulfide was found to be 3.4 eV. Differential thermal analysis and thermogravimetry of the concentrate showed a decomposition of chalcopyrite at 658 K with an activation energy of 208 kJ·mol?1, and two successive structural changes of silica at 848 K and 1145 K.
Mathematical Modelling for Hydrodynamic Studies of Spouted Bed
B. Sahoo,A. Sahoo
Lecture Notes in Engineering and Computer Science , 2011,
Fluidization and Spouting of Fine Particles: A Comparison
Pranati Sahoo,Abanti Sahoo
Advances in Materials Science and Engineering , 2013, DOI: 10.1155/2013/369380
Abstract: The fluidization characteristics of fine particles have been studied in both the fluidized bed and spouted bed. The effect of different system parameters (viz. static bed height, particle size, particle density and superficial velocity of the fluidizing medium, rotational speed of stirrer, and spout diameter) on the fluidization characteristics such as bed expansion/fluctuation ratios, bed pressure drop, minimum fluidizing/spouting velocity, and fluidization index of fine particles (around 60 micron particle size) have been analyzed. A stirrer/rod promoter has been used in the bed to improve the bed fluidity for fluidization process and spout diameter has been varied for spouted bed. Mathematical expressions for these bed dynamics have been developed on the basis of dimensionless analysis. Finally calculated values of these bed dynamics are compared with the experimentally observed values thereby indicating the successful applications of these developed correlations over a wide range of parameters. 1. Introduction Fluidization quality is closely related to particle intrinsic properties. The difference between fluidized bed and spouted bed lies in the dynamic behaviours of the solid particles. In a fluidized bed, air is passed through a multiorifice distributor/plate to fluidize the particles. Fluidized bed is divided mainly in two regions; bubble phase and emulsion phase [1] as shown in Figure 1. Figure 1: Different regions of fluidized/spouted bed. Spouted bed is gas-solid contactor in which the gas is introduced through a single orifice from the centre of a flat base, instead of a multiorifice system, resulting in a systematic cyclic pattern of solid movement inside the bed [2] as shown in Figure 1. A spouted bed has three different regions: the annulus, the spout, and the fountain [3, 4]. At stable spouting process, a spout appears at the centre of bed, a fountain appears above the bed surface and an annulus forms between the spout and wall, as shown in Figure 1. At stable spouting process, spout and fountain are similar to fluidized beds where particles are dynamically suspended. On the other hand the annulus region is more like a packed bed. At partial spouting case, there are two distinct regions, an internal spout which is similar to a fluidized bed and the surrounding packed particle region similar to a packed bed. It is observed that spouted bed perform better for defluidization or segregation of particles [5]. As the particle size decreases the cohesive force between the particles increases causing the fluidity of the bed to decrease [1] for
Studies on Parameter Optimization for Particle Growthin a Fluidized BedGranulator: Interval Halving Method
Abanti Sahoo,Lisa Sahoo
International Journal of Engineering Research , 2014,
Abstract: Abstract :Effects of various process parameters such as amount of liquid binder, temperature, gas flow rate and weight of bed materials on the growth of particles in a Fluidized Bed Granulator are analysed. A comparative study is carried out for two bed materials (i.e. TiO2 and CaCO3) through experimentations. The result i.e. particle size of fluidized bed materials is correlated with the various process parameters. These correlations are observed to be satisfactory with both exponential and power trends but higher R2 value is observed with the exponential trend. The calculated values of the percentage of particle growth thus obtained through these developed correlations are compared with the experimental values for both the bed materials which show good agreements with each other. The process parameters are also optimised using Interval Halving method which indicates improvement in the performance of the fluidized bed granulator. MATLAB coding is also developed for the optimization of these correlations. Neither any local maximum nor any local minimum is observed with any of the system parameters thereby implying further the better applicability of these developed correlations over a wide range of parameters.
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