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Search Results: 1 - 10 of 23667 matches for " Sumana Paul "
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The nonuniqueness of Chekanov polynomials of Legendrian knots
Paul Melvin,Sumana Shrestha
Mathematics , 2004, DOI: 10.2140/gt.2005.9.1221
Abstract: Examples are given of prime Legendrian knots in the standard contact 3-space that have arbitrarily many distinct Chekanov polynomials, refuting a conjecture of Lenny Ng. These are constructed using a new `Legendrian tangle replacement' technique. This technique is then used to show that the phenomenon of multiple Chekanov polynomials is in fact quite common. Finally, building on unpublished work of Yufa and Branson, a tabulation is given of Legendrian fronts, along with their Chekanov polynomials, representing maximal Thurston-Bennequin Legendrian knots for each knot type of nine or fewer crossings. These knots are paired so that the front for the mirror of any knot is obtained in a standard way by rotating the front for the knot.
Determination of Lanthanides, Thorium, Uranium and Plutonium in Irradiated (Th, Pu)O2 by Liquid Chromatography Using α-Hydroxyiso Butyric Acid (α-HIBA)  [PDF]
Pranaw Kumar, P. G. Jaison, Vijay M. Telmore, Sumana Paul, Suresh K. Aggarwal
International Journal of Analytical Mass Spectrometry and Chromatography (IJAMSC) , 2013, DOI: 10.4236/ijamsc.2013.11009

An HPLC method is presented for the separation and determination of lanthanides (Lns), thorium (Th), uranium (U) and plutonium (Pu) from irradiated (Th, Pu)O2. Individual separation of Lns, Th, U and Pu is a challenging task becauseof 1) lanthanideshavingsimilar physical and chemical properties, 2) presence of complex matrix like irradiated fuel and 3) the co-existence of multiple oxidation states of Pu. Different procedures were developed for separation of individual lanthanides and actinides.The individual lanthanides were separated on a dynamically modified reversed phase (RP) column using n-octane sulfonic acid as an ion interaction reagentand employingdual gradient(pH and concentration) of α-hydroxyisobutyric acid (HIBA). In order to improve the precision on the determination of Lns, terbium (Tb) was used as an internal standard. The method was validated employing simulated high level liquid waste. Concentrations of lanthanides viz. lanthanum (La) and neodymium (Nd) in the dissolver solution were determined based on their peak areas. Th, U and Pu were separated on a RP column using mobile phase containing HIBA and methanol. Since Pu is prone to exist in multiple oxidation states, all the oxidation states were converted into Pu (IV) using H2O2 in 3M HNO3. Under the optimized conditions, Pu(IV) eluted first followed by Th and U. The concentrations of Th, U and Pu were determined by standard addition method andwere found to be 1.10 ± 0.02 mg/g, 5.3 ± 0.3 μg/g and 27 ± 1 μg/g, respectively, in the dissolver solution of irradiated fuel. These values were in good agreement with the concentration of Th determined by biamperometry and those of U and Puby isotope dilution thermal ionization mass spectrometry.

Electromagnetic Mass Models in General Theory of Relativity
Sumana Bhadra
Physics , 2007,
Abstract: "Electromagnetic mass" where gravitational mass and other physical quantities originate from the electromagnetic field alone has a century long distinguished history. In the introductory chapter we have divided this history into three broad categories -- classical, quantum mechanical and general relativistic. Each of the categories has been described at a length to get the detailed picture of the physical background. Recent developments on Repulsive Electromagnetic Mass Models are of special interest in this introductory part of the thesis. In this context we have also stated motivation of our work. In the subsequent chapters we have presented our results and their physical significances. It is concluded that the electromagnetic mass models which are the sources of purely electromagnetic origin ``have not only heuristic flavor associated with the conjecture of Lorentz but even a physics having unconventional yet novel features characterizing their own contributions independent of the rest of the physics".
The Drosophila Perlecan gene trol regulates multiple signaling pathways in different developmental contexts
Jonathan R Lindner, Paul R Hillman, Andrea L Barrett, Megan C Jackson, Trinity L Perry, Youngji Park, Sumana Datta
BMC Developmental Biology , 2007, DOI: 10.1186/1471-213x-7-121
Abstract: Different mutations in trol allow developmental progression to varying extents, suggesting that trol is involved in multiple cell-fate and patterning decisions. Analysis of the initiation of neuroblast proliferation at second instar demonstrated that trol regulates this event by modulating signaling by Hedgehog and Branchless, as it does during first instar. Trol protein is distributed over the surface of the larval brain, near the regulated neuroblasts that reside on the cortical surface. Mutations in trol also decrease the number of circulating plasmatocytes. This is likely to be due to decreased expression of pointed, the response gene for VEGF/PDGF signaling that is required for plasmatocyte proliferation. Trol is found on plasmatocytes, where it could regulate VEGF/PDGF signaling. Finally, we show that in second instar brains but not third instar brain lobes and eye discs, mutations in trol affect signaling by Decapentaplegic (a Transforming Growth Factor family member), Wingless (a Wnt growth factor) and Hedgehog.These studies extend the known functions of the Drosophila Perlecan homolog trol in both developmental and signaling contexts. These studies also highlight the fact that Trol function is not dedicated to a single molecular mechanism, but is capable of regulating different growth factor pathways depending on the cell-type and event underway.Heparan sulfate proteoglycans (HSPGs) are a family of cell-surface and extracellular proteins modified by the attachment of glycosaminoglycan chains. The general structure of the protein core determines the family the HSPG belongs to: Syndecans contain a transmembrane domain, Glypicans are tethered to the cell surface via a GPI linkage and Perlecans are secreted components of the extracellular matrix. Both the protein core and glycan chains play important roles in HSPG function through protein-protein and sugar-protein interactions. Genetic studies, first in Drosophila and later in mouse and zebrafish, demonstrated
Ethanol production potential from fermented rice noodle wastewater treatment using entrapped yeast cell sequencing batch reactor
Sumana Siripattanakul-Ratpukdi
Applied Water Science , 2012, DOI: 10.1007/s13201-011-0024-z
Abstract: Fermented rice noodle production generates a large volume of starch-based wastewater. This study investigated the treatment of the fermented rice noodle wastewater using entrapped cell sequencing batch reactor (ECSBR) compared to traditional sequencing batch reactor (SBR). The yeast cells were applied because of their potential to convert reducing sugar in the wastewater to ethanol. In present study, preliminary treatment by acid hydrolysis was performed. A yeast culture, Saccharomyces cerevisiae, with calcium alginate cell entrapment was used. Optimum yeast cell loading in batch experiment and fermented rice noodle treatment performances using ECSBR and SBR systems were examined. In the first part, it was found that the cell loadings (0.6–2.7 × 108 cells/mL) did not play an important role in this study. Treatment reactions followed the second-order kinetics with the treatment efficiencies of 92–95%. In the second part, the result showed that ECSBR performed better than SBR in both treatment efficiency and system stability perspectives. ECSBR maintained glucose removal of 82.5 ± 10% for 5-cycle treatment while glucose removal by SBR declined from 96 to 40% within the 5-cycle treatment. Scanning electron microscopic images supported the treatment results. A number of yeast cells entrapped and attached onto the matrix grew in the entrapment matrix.
Multi-segment Printed Monopole Antenna for Multi- band Wireless Communication
Sumana Kumari,Nisha Gupta
Microwave Review , 2011,
Abstract: A novel planar monopole antenna capable of multi-band operation is proposed. The proposed antenna has eight segment planar rectangular radiation patches placed on a baseline segment, fed by a CPW-feed. The proposed structures cover the useful bands such as IEEE 802.11 a, b, etc. Details of the proposed design along with the simulation and experimental results obtained are presented and discussed.
Benign intracystic phyllodes tumor of breast
Santosh K,Sumana B
Indian Journal of Pathology and Microbiology , 2010,
Gender issues in project management: A subtlety
Pacha, Malyadri,Banda, Sumana
International Journal of Research Studies in Management , 2013,
Abstract: There are 2 bottlenecks in the drive of literacy towards women empowerment. Classifying women in India into 2 economic categories, the lower socio-economic category is still struggling to establish a higher literacy rate amongst the girl child. In the upper strata, where education equality has been established, the concern is equality in the corporate world. The present paper is an attempt to analyze the impact of growing project management responsibilities on women. Have women in software project management shifted from this technical and marketing fronts to other soft skill departments to combat issues of domestic and corporate imbalance or have they stepped off from the corporate ladder! The paper tries to derive a pattern of both similarity and difference in the managerial competence of male and female managers in the technological domain and analyze the steps to arrive at the androgynous manager model.
Synthesis and Anti-Inflammatory Activity of Pyrazolines
B. Ramesh,T. Sumana
Journal of Chemistry , 2010, DOI: 10.1155/2010/731675
Energy density in general relativity: a possible role for cosmological constant
Saibal Ray,Sumana Bhadra
Physics , 2002, DOI: 10.1016/j.physleta.2004.01.029
Abstract: We consider a static spherically symmetric charged anisotropic fluid source of finite physical radius (\sim 10^{-16} cm) by introducing a scalar variable \Lambda dependent on the radial coordinate r under general relativity. From the solution sets a possible role of the cosmological constant is investigated which indicates the dependency of energy density of electron on the variable \Lambda.
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