633 research outputs found
Calculation of Energy Levels for Nuclei 34S,34Ar,34Cl by using Surface Delta Interaction
The energy levels have been calculated by using the nuclear shell model and adopting the surface delta interaction for the nuclei 34S, 34Ar and 34Cl with two additional nucleons which are located outside close core 32S. A comparison had been made between our theoretical predictions and the recent available experimental data . A reasonable agreement were obtained from these comparisons . Key words: shell model, energy levels, Surface delta interaction
Macronutrient status and yield stability of arecanut (Kahikuchi) under integrated nutrient management practice in Assam
A long term field  experiment was carried out in clay-loam soil at ICAR-CPCRI, Kahikuchi campus,  Guwahati, Assam during 2000-2012 with arecanut variety Kahikuchi with seven  nutrient combinations. The treatments included control (T1), 100 per cent  vermicompost (T2), 200 per cent vermicompost (T3), 100 per cent chemical  fertilizer (T4), 50 per cent vermicompost + 50 per cent chemical fertilizer  (T5), 1/3rd vermicompost + 2/3rd chemical fertilizer  (T6) and 2/3rd vermicompost + 1/3rd chemical fertilizer  (T7). The treatment T7 produced highest fresh ripened arecanut yield of 16.7  kg i.e., about 3.6 kg dry chali per palm. Positive correlations were  obtained between yield of arecanut and soil available N, P, K content.  Significant and positive correlation was found between leaf N, P, K and  available N, P, K content in surface and sub-surface soil. Available N, P and  K content increased over the year under nutrient applied plot that reflected  in yield of arecanut. The average yield in various treatments followed in the  order of T7 > T5 = T6 > T2 = T3 > T4 > T1. The application of  targeted, sufficient and balanced quantities of organic and inorganic  fertilizer will be the need of the hour to make nutrients available for  higher yield, soil fertility maintenance and agricultural sustainability  without polluting environment
Response and Bioaccumulation Potential of Boerhavia diffusa L. Towards Different Heavy Metals
Effect of different concentrations of heavy metals such as Cadmium, Chromium, Mercury and Leadwas studied by cultivating rooted propagules of Boerhavia diffusafor a period of twenty days in Hoagland nutrient medium artificially contaminated with known concentration of those heavy metal ions. Concentrations of the metals selected to impart visible symptoms of growth retardation and to permit survival for prolonged period are 30µM cadmium chloride (CdCl2), 400 µM potassium dichromate (K2Cr2O7), 10 µM mercuric chloride (HgCl2), and 600 µM lead acetate (CH3-COO)2Pb. More or less uniform growth performance was shown by the plants irrespective of the differences of concentration of the heavy metals. However, parameters such as root - and stem length, stomatal - and tolerance index varied among the treatments. Significant differences were observed in the heavy metal accumulation potential among metals and between plant parts such as root, stem and leaf and the pattern was dependent on growth period
Sustainability of soil health and system productivity through arecanut based cropping system in the NE Region of India
The North-Eastern part of India contains seven states out of which, Assam is the major producer of arecanut. An attempt was made to study the impact of arecanut based multiple cropping system with proper utilization of recyclable resources on the long-term sustainability of acid soil at Kahikuchi. A long term arecanut based High-Density Multispecies Cropping System garden comprised of two models viz., Model-1 (M1): arecanut (Areca catechu), black pepper (Piper nigrum), banana (Musa spp.), citrus (Citrus limon) and clove (Syzygium aromaticum) and Model-2 (M2): arecanut, black pepper, banana, citrus and nutmeg (Myristica fragrans) as component crops was used. Both the models were sub-divided into three treatments viz., Full dose of recommended fertiliser (T1), 2/3rd of the recommended dose (T2) and 1/3rd of the recommended dose (T3) combined with treatment-wise recycling available biomass in the form of vermicompost and each treatment was replicated thrice. The results indicated that the quantity of recyclable biomass generated ranged between 8.27 to 12.23 t ha-1 year-1 and 8.11 to 12.38 t ha-1 year-1 in model-1 and model-2, respectively and revealed that the T2 treatment in both models improved the soil properties with respect to soil pH, organic carbon, available N, P and K status. Economics of the cropping system revealed that the maximum return was obtained from both Models under T2. The average benefit:cost ratio of T1, T2 & T3 was 3.38, 4.42 & 3.47 under model-1 and 3.34, 4.08 and 3.40 under model-2, respectively. Sustenance of soil pH above 5.0 over the years in the arecanut rhizosphere in both the models were found under T2, but T1 and T3 treatments showed a slow declining of pH towards increasing soil acidity
PHYSICAL ADSORPTION OF REFORMING CATALYST BYNITROGEN
Physical adsorption by nitrogen gas was studied on seven commercial platinum reforming catalysts
(RG-402, RG-412, RG-432, RG-451, RG 422,RG-482, PS-10), four prepared platinum catalysts
(0.1%Pt/alumina, 0.2 %Pt/alumina, 0.45 %Pt/alumina and 0.55% Pt/alumina), and -alumina
support.
Physical adsorption was carried out by using Accelerated Surface Area and Porosimetry (ASAP
2400 device) at 77 K .
The results indicate that the surface area in genaral decreases with increasing platinum
percentage,high platinum loaded (0.45% and 0.55%) it was found that the percent increasing in
surface area was lower than those obtained for low platinum loaded catalysts , and at very higher
platinum loading 0.6 %Pt , some reduction in surface area was observed . The precipitation of Re
and Ir metals with 0.35 % and 0.6 % platinum increases the surface area , while precipitation of
0.57% Sn with 0.375% Pt/ -alumina deceases the surface area catalyst
Microcontroller-based phase-angle measurement and correctiontechnique
An intelligent system is presented, which monitors the phase angle continuously and in the event of the phase angle deviating beyond the allowable limits, a correction action is initialized to compensate for this difference by continuously changing a variable capacitor. Adjustment of the capacitance value is done automatically and the major advantage of the proposed system is its ability to continuously change the capacitance in a linear manner. Thus achieving high degree of accuracy in phase angle correction is feasible. The system has been implemented on an 8-bit microcontroller. Experimental results obtained show that the phase angle can be linearly varied over a wide range at different frequencies of the input signa
Microcontroller-based phase-angle measurement and correctiontechnique
An intelligent system is presented, which monitors the phase angle continuously and in the event of the phase angle deviating beyond the allowable limits, a correction action is initialized to compensate for this difference by continuously changing a variable capacitor. Adjustment of the capacitance value is done automatically and the major advantage of the proposed system is its ability to continuously change the capacitance in a linear manner. Thus achieving high degree of accuracy in phase angle correction is feasible. The system has been implemented on an 8-bit microcontroller. Experimental results obtained show that the phase angle can be linearly varied over a wide range at different frequencies of the input signa
Revisiting Noether gauge symmetry for F(R) theory of gravity
Noether gauge symmetry for F(R) theory of gravity has been explored recently.
The fallacy is that, even after setting gauge to vanish, the form of F(R)
\propto R^n (where n \neq 1, is arbitrary) obtained in the process, has been
claimed to be an outcome of gauge Noether symmetry. On the contrary, earlier
works proved that any nonlinear form other than F(R) \propto R^3/2 is obscure.
Here, we show that, setting gauge term zero, Noether equations are satisfied
only for n = 2, which again does not satisfy the field equations. Thus, as
noticed earlier, the only admissible form that Noether symmetry is F(R) \propto
R^3/2 . Noether symmetry with non-zero gauge has also been studied explicitly
here, to show that it does not produce anything new.Comment: 9 pages, To appear in Astrophysics Space Scienc
Bianchi Type I Cosmology in Generalized Saez-Ballester Theory via Noether Gauge Symmetry
In this paper, we investigate the generalized Saez-Ballester scalar-tensor
theory of gravity via Noether gauge symmetry (NGS) in the background of Bianchi
type I cosmological spacetime. We start with the Lagrangian of our model and
calculate its gauge symmetries and corresponding invariant quantities. We
obtain the potential function for the scalar field in the exponential form. For
all the symmetries obtained, we determine the gauge functions corresponding to
each gauge symmmetry which include constant and dynamic gauge. We discuss
cosmological implications of our model and show that it is compatible with the
observational data.Comment: 13 pages, 2 figures, accepted for publication in 'European Physical
Journal C
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