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Search Results: 1 - 10 of 325501 matches for " S. Chitra "
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Sono-Photo Fenton Treatment of Liquid Waste Containing Ethylenediaminetetraacetic Acid (EDTA)  [PDF]
S. Chitra, K. Paramasivan, P. K. Sinha
International Journal of Nonferrous Metallurgy (IJNM) , 2013, DOI: 10.4236/ijnm.2013.22012
Abstract:

Ethylenediaminetetraacetic acid (EDTA) is a chelating agent that has been used for decontamination purposes in nuclear industry. The presence of EDTA in decontamination wastes can cause complexation of the cations resulting into interferences in their removal by various treatment processes such as chemical precipitation, ion exchange etc. Further, it might also impart elevated leachability of cationic contaminants from the conditioned wastes immobilized in cement or other matrices and can negatively influence the quality of the final form of waste. In the present study, kinetics of degradation of EDTA (20,000 mg/l) by employing either Photo-Fenton process using UV (15 W λmax = 253.7 nm) or Sono-Fenton process using ultrasound at 130 KHz or simultaneous Sono-Photo Fenton process has been investigated. EDTA is effectively degraded by the synergistic effect of both Photo Fenton and Sono Fenton process. All the above mentioned processes were found to follow a first order kinetics reaction. From the observed pH changes during the oxidation processes, it can be concluded that there is a loss of chelating ability of EDTA. Formation of amides was con- firmed during the degradation processes.

Software Process Improvement Through Secured Development Lifecycle
S. Chitra,M. Rajaram
Asian Journal of Information Technology , 2012,
Abstract: This study discusses the software process improvement through Secured Development Lifecycle (or SDL), a process adopted for the development of software that needs to withstand malicious attack. The process encompasses the addition of a series of security-focused activities and deliverables to each of the phases of software development process. These activities and deliverables include the development of threat models during software design, the use of static analysis code-scanning tools during implementation and the conduct of code reviews and security testing during a focused `security push`.
Comparative study for two color spaces HSCbCr and YCbCr in skin color detection
S. Chitra,G. Balakrishnan
Applied Mathematical Sciences , 2012,
Abstract:
Global vertex-edge domination sets in graph
S. Chitra,R. Sattanathan
International Mathematical Forum , 2012,
Abstract:
Synthesis and in vitro microbiological evaluation of 5-acetyl-4-aryl-6-methyl-3,4- dihydropyrimidin-2(1H)-thiones using calcium fluoride as catalyst
S. Chitra,D. Devanathan
International Journal of Pharmaceutical and Biological Research , 2012,
Abstract: Seven 5-acetyl-4-aryl-6-methyl-3,4-dihydropyrimidin-2(1H)-thiones 10-16 are prepared by a one-pot cyclocondensation reaction of acetylacetone (1), thiourea (2) and aldehyde (3-9) in ethanol using calcium fluoride as the catalyst is described. All the compounds are screened for their antibacterial activity against Staphylococcus aureus, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Salmonella typhi and antifungal activity against Candida albicans, Aspergillus flavus, Rhizopus and Mucor. Ciprofloxacin is used for the standard for antibacterial and Amphotericin B is used for the standard for antifungal studies. Compounds 12-15 exhibited excellent in vitro antibacterial activity against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa. Whereas the same set of compounds exerted potent in vitro antifungal activity against Candida albicans and Aspergillus flavus.
Variability and association among fruit traits in palmyrah (Borassus flabellifer L.)
V. Ponnuswami* and S. Chitra
Electronic Journal of Plant Breeding , 2011,
Abstract: One hundred and twenty nine palmyrah genotypes were collected from various parts of India and Fruit characterization wasdone.. Variability parameters indicated that high variability exist for fruit weight (g) and weight of shreds (g). Moderatevariability was observed for weight of seed. Low variability was observed for fruit length (cm), fruit diameter (cm), length ofseed (cm), circumference of seed and weight of flesh (g). Hence all the characters except seed weight are good for furtherimprovement through selection. The correlation studies for eight fruit characters indicated that all traits namely fruit weight (g),fruit length (cm), fruit diameter (cm), weight of seed (g), length of seed (cm), circumference of seed, weight of flesh (g) andweight of shreds (g) had significant and positive correlation. Hence simultaneous selection is possible for all these traits inPalmyrah.
Genotypic variation and hierarchical clustering of Palmyrah (Borassus flabellifer L.)
V. Ponnuswami and S. Chitra
Electronic Journal of Plant Breeding , 2011,
Abstract: The genotypic divergence and hierarchical clustering based on morphological, fruit and seed traits was studied in 48 palmyrah genotypes of diverse genetic background. Significant differences were recorded for morphological, fruit and seed characters among genotypes. Highest variability was observed in fruit weight followed by Neera yield and Tree height. Multivariate hierarchical cluster analysis was done to classify genotypes according to their degree of similarity in morphological, fruit seed and pooled traits.
Effect of random interactions in spin baths on decoherence
S. Camalet,R. Chitra
Physics , 2006, DOI: 10.1103/PhysRevB.75.094434
Abstract: We study the decoherence of a central spin 1/2 induced by a spin bath with intrabath interactions. Since we are interested in the cumulative effect of interaction and disorder, we study baths comprising Ising spins with random ferro- and antiferromagnetic interactions between the spins. Using the resolvent operator method which goes beyond the standard Born-Markov master equation approach, we show that, in the weak coupling regime, the decoherence of the central spin at all times is entirely determined by the local-field distribution or equivalently, the dynamical structure factor of the Ising bath. We present analytic results for the Ising spin chain bath at arbitrary temperature for different distributions of the intrabath interaction strengths. We find clear evidence of non-Markovian behavior in the low temperature regime. We also consider baths described by Ising models on higher-dimensional lattices. We find that interactions lead to a significant reduction of the decoherence. An important feature of interacting spinbaths is the saturation of the asymptotic Markovian decay rate at high temperatures, as opposed to the conventional Ohmic boson bath.
Enhanced decoherence in the vicinity of a phase transition
S. Camalet R. Chitra
Physics , 2007,
Abstract: We study the decoherence of a spin-1/2 induced by an environment which is on the verge of a continuous phase transition. We consider spin environments described by the ferromagnetic and antiferromagnetic Heisenberg models on a square lattice. As is well known, these two dimensional systems undergo a continuous phase transition at zero temperature, where, the spins order spontaneously. For weak coupling of the central spin to these baths, we find that as one approaches the transition temperature, critical fluctuations make the central spin decohere faster. Furthermore, the decoherence is maximal at zero temperature as signalled by the divergence of the Markovian decoherence rate.
Efficient Regeneration System for Genetic Transformation of Mulberry (Morus indica L. Cultivar S-36) Using in Vitro Derived Shoot Meristems  [PDF]
D. S. Vijaya Chitra, Bhaskarrao Chinthapalli, G. Padmaja
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.51001
Abstract:

Shoot meristems used for the study were exercised from the in vitro regenerated shoots cultured on MS medium supplemented with 0.5 mg/L of BAP for multiplication. The sensitivity of the in vitro regenerated was studied using shoot meristems of 0.5 cm. Shoot meristems were cultured on medium containing 10-100 mg/l kanamycin to determine the concentration that was lethal for multiple shoot induction and root induction. The response of shoot multiplication decreased (66.2%-6.2%) as the concentration of kanamycin increased (10.0-70.0 mg/L) with complete inhibition of shoot proliferation at 100 mg/L kanamycin. The rooting phase was very sensitive to kanamycin compared to shoot multiplication. The percentage of shoots that rooted decreased (53.8%-4.8%) with increase in the concentration of kanamycin (10.0-70.0 mg/l) on IBA and 2,4-D supplemented medium. For transformation studies, the shoot tips that were infected with Agrobacterium strain were placed on selection medium containing MS medium with 0.5 mg/L BAP and 100 mg/L kanamycin and scored for the putative transformed shoots. An average of 62.2% of shoot tips developed shoot buds from the base and the shoots reached a length of 0.5

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