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Search Results: 1 - 10 of 21996 matches for " Sumanta Kumar Mandal "
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2. Sonourethrography in the evaluation of anterior urethral stricture: correlation with retrograde urethrography in male
Sumanta Kumar Mandal,Sujit Kumar Bhattacharyya,Abhijit Mandal,Debasis Deoghuria
International Journal of Pharmaceutical and Biomedical Research (IJPBR) , 2012,
Abstract: Purpose of this study was to evaluate the efficacy of sonourethrography (SUG) in detection and evaluation of anterior urethral strictures in male compared with retrograde urethrography (RUG). 50 male patients with clinically suspected benign anterior urethral stricture were subjected to RUG followed by SUG performed independently by different observer and subsequently correlated with operative findings. 50 patients with a diagnosis of urethral stricture were evaluated. Short segment, intermediate and long segment urethral stricture were detected were detected by RUG in 13,17,10 patients respectively as compared to 15,18,13 patients by SUG respectively. Sensitivity for detection of short, intermediate and long segment stricture with sonourethrography was 100%, 90.9%; & 88.2% respectively as compared to 88.23%; 83.3%, & 65.2% respectively on retrograde urethrography. Apart from stricture, mucosal, submucosal and periurethral soft tissue abnormalities could be followed up by sonourethrography as compared to retrograde urethrography. Mucosal abnormalities could be detected by SUG in 30% cases as compared to 10% by RUG, submucosal abnormalities were detected in 18% by SUG as opposed to none in RUG & spongiofibrosis was detected in 50% of case by SUG as opposed to none by RUG. SUG could detect diverticulas in 14% as against 8% by RUG and false tract in 6% cases by SUG as against 2% by SUG. Sonourethrography is highly sensitive for and accurate predictor of anterior urathral stricture for the detection of site and length of stricture for planning surgery and should be preferred diagnostic procedure. Retrograde urethrography underestimated the length of stricture in most of the cases. In addition, periurethral soft tissues can be well assessed by sonourethrography.
A Study on Lipid Profiles in Chronic Liver Diseases
Sanjay Kumar Mandal,Koelina Sil,Sumanta Chatterjee,Jacky Ganguly
National Journal of Medical Research , 2013,
Abstract: Background and Aims: The study was conducted to determine the lipid profiles in patients with chronic liver disease and to determine if it correlates with the severity of the chronic liver disease. Materials and Methods: In an analytical cross-sectional study,120 patients with chronic liver disease (case) and 50 age- and sex-matched Healthy patients (controls) were studied. Serum triglyceride level, total cholesterol,HDL LDL,VLDL were then measured. Child-Turcotte-Pugh Score were calculated for each patient as an index for the extent of liver damage. Results: In patients with chronic liver diseases,with the exception of triglyceride level, there was a significant decrease in total cholesterol, LDL,VLDL and HDL cholesterol levels compared to the control group( p<0.05). However, no significant correlation was found between severity of cirrhosis and change in serum lipid levels. [Natl J of Med Res 2013; 3(1.000): 70-72]
Exceptional point description of one-dimensional chiral topological superconductors/superfluids in BDI class
Ipsita Mandal,Sumanta Tewari
Physics , 2015, DOI: 10.1016/j.physe.2015.12.009
Abstract: We show that certain singularities of the Hamiltonian in the complex wave vector space can be used to identify topological quantum phase transitions for $1D$ chiral topological superconductors/superfluids in the BDI class. These singularities fall into the category of the so-called exceptional points ($EP$'s) studied in the context of non-Hermitian Hamiltonians describing open quantum systems. We also propose a generic formula in terms of the properties of the $EP$'s to quantify the exact number of Majorana zero modes in a particular chiral topological superconducting phase, given the values of the parameters appearing in the Hamiltonian. This formula serves as an alternative to the familiar integer ($\mathbb{Z}$) winding number invariant characterizing topological superconductor/superfluid phases in the chiral BDI class.
Removal of hexavalent chromium by an aromatic alcohol  [PDF]
Ankita Basu, Rumpa Saha, Jayashree Mandal, Sumanta Ghosh, Bidyut Saha
Journal of Biomedical Science and Engineering (JBiSE) , 2010, DOI: 10.4236/jbise.2010.37098
Abstract: Cr(VI) is a widespread environmental contaminant and a known human carcinogen. Biosorption is a very common method to remove toxic Cr(VI) from industrial waste water. In biosorption Cr(VI) is reduced to less toxic Cr(III) and adsorbed in biosorbent as Cr(III). Effective biosorbents contain hydroxy groups; it may be aliphatic or aromatic. Kinetics of reduction of Cr(VI) by an aromatic alcohol, benzyl alcohol, (which is an important volatile component of flowers of some night blooming plants) in micellar media have been studied spectrophotometrically. Micellar media is a probe to establish the mechanistic paths of reduction of Cr(VI) to Cr(III). Effects of electrolytes are studied to support the proposed reaction mechanism. Suitable surfactant & suitable concentration of electrolyte enhance the biosorption property.
Mathematical Model to Locate Interference of Blast Waves from Multi-Hole Blasting Rounds  [PDF]
Sujit Kumar Mandal
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.43019
Abstract: Maximum charge per delay in a blasting round is universally accepted as the influencing parameter to quantify magni-tude of vibration for any distance of concern. However, for any blasting round experimental data reveals that for same charge per delay magnitude of vibration varies with total charge. Considering linear transmission of blast waves, the paper firstly investigates into the influence of explosive weight, blast design parameters and geology of strata on magnitude and characteristics of vibration parameters and thereafter communicates that possibly interference of blast waves generated from same and different holes of a blasting round result into variation in vibration magnitude. The paper lastly developed a mathematical model to evaluate points of interference of blast waves generated from single- and multi-hole blasting round.
Mass deposition and fluid flow in stenotic arteries: Rectangular and half-circular models  [PDF]
Dipak Kumar Mandal, Somnath Chakrabarti
Journal of Biomedical Science and Engineering (JBiSE) , 2013, DOI: 10.4236/jbise.2013.612139
Abstract:

Mass deposition inside the artery wall may play a significant role in the development of the disease atherosclerosis. Locally elevated concentrations of LDL in the arterial wall are considered to be the initiator of atherosclerotic plaque formation. In this study, an attempt has been made to study initially the effect of fluid dynamic parameters on the disease and finally proposed a concept, from the idea of basic flow characteristics in constricted arteries, for the assessment of mass deposition in the arterial wall to some extent for rectangular as well as half circular stenosed models. Reynolds numbers are chosen as 100, 200, 300 and 400 and percentage of restrictions as 30%, 50%, 70% and 90% respectively. The governing Navier-Stokes and continuity equations are solved in the artery lumen with the commercial CFD code ANSYS 12.1. The pressure-velocity coupling equations are solved by SIMPLE (Semi-Implicit Method for Pressure-Linked Equations) algorithm. The studies on pressure drop at stenosis zone and flow separation zone reveal that the effect of percentage of restriction is more dominant than Reynolds number on the progression of the disease, atherosclerosis for any shaped restriction. The mass deposition results of rectangular and half circular stenotic models motivate to conclude that the effect of percentage of restriction is more prone to the disease than that of Reynolds number. Half circular stenotic shape insists for the less chance of mass deposition in the arterial wall compared to rectangular shaped restriction.

Majority of Actinobacterial Strains Isolated from Kashmir Himalaya Soil Are Rich Source of Antimicrobials and Industrially Important Biomolecules  [PDF]
Pulak Kumar Maiti, Sukhendu Mandal
Advances in Microbiology (AiM) , 2019, DOI: 10.4236/aim.2019.93016
Abstract: Studies on actinobacterial diversity are immensely important research arenas as they are the major root of antimicrobial, anticancer and immunosuppressant agents. Here we have performed a community analysis and isolated about 135 morphologically different actinobacteria using five different Actinomyces-specific media from an unique unexplored site of Kashmir Himalaya, India, in order to screen different bioactive compounds specially the antimicrobials. Among these actinobacteria, 42 isolates show antimicrobial activity against a set of pathogenic organisms. Secretion of different biomolecules of industrial significance were assessed which resulted 53 xylanase producers, 57 IAA producers, and 63 isolates produce gelatinase. Pectinase, phosphatase, lipase, amylase, and cellulase producing ability have been shown by about 41, 32, 102, 92, and 83 isolates, respectively. Analysis of their 16S rRNA sequence followed by phylogenetic analysis has depicted that most of the isolates belong to the genus of Streptomyces and rests are Streptosporangium, Lentzea, Gordonia, Amycolatopsis and Lechevalieria. We have also screened the presence of secondary metabolite production pathways by PCR amplifying the biosynthetic gene of polyketide synthase (PKS-I) and non ribosomal peptide synthetase (NRPS) from the antibiotic producing strains. Antibiotic sensitivity profile of these isolates has also been studied. The potential antimicrobial compound producing strains have further been studied in order to find their efficacy to kill bacterial and fungal pathogens. Thus the study led to a promising field of antibiotic discovery and bioprospecting actinobacteria through their metabolites of industrial potential in near future.
Bilateral nephromegaly and arthritis: A rare presentation of acute lymphoblastic leukemia  [PDF]
Tapas Kumar Sabui, Syamal Sardar, Sumanta Laha, Abhishek Roy
Open Journal of Pediatrics (OJPed) , 2013, DOI: 10.4236/ojped.2013.33044
Abstract:

A 2.5 years old boy presented with fever, intermittent small joint arthritis of hands and feet, bilateral nephromegaly with normal hemogram and uric acid level. Bone marrow aspiration revealed pre-B acute lymphoblastic leukemia without leukemic infiltration of kidneys. Leukemia should be suspected in any patient with arthritis and nephromegaly.

Amplitude mode of the $d$-density wave state and its relevance to high-$T_c$ cuprates
Jay D. Sau,Ipsita Mandal,Sumanta Tewari,Sudip Chakravarty
Physics , 2012, DOI: 10.1103/PhysRevB.87.224503
Abstract: We calculate the spectrum of the amplitude mode, the analog of the Higgs mode in high energy physics, for the $d$-density wave (DDW) state proposed to describe the pseudogap phase of the high $T_c$ cuprates. Even though the state breaks translational symmetry by a lattice spacing and is described by a particle-hole singlet order parameter at the wave vector $q=Q=(\pi,\pi)$, remarkably, we find that the amplitude mode spectrum can have peaks at both $q=(0,0)$ and $q=Q=(\pi,\pi)$; we shall lattice spacing to unity. In general, the spectrum is non-universal, and, depending on the microscopic parameters, can have one or two peaks in the Brillouin zone, signifying existence of two kinds of magnetic excitations. Our theory sheds important light on how multiple inelastic neutron peaks at different wave vectors can, in principle, arise even with an order parameter that condenses at $Q=(\pi,\pi)$.
Geometric Programming Approach to an Interactive Fuzzy Inventory Problem
Nirmal Kumar Mandal
Advances in Operations Research , 2011, DOI: 10.1155/2011/521351
Abstract: An interactive multiobjective fuzzy inventory problem with two resource constraints is presented in this paper. The cost parameters and index parameters, the storage space, the budgetary cost, and the objective and constraint goals are imprecise in nature. These parameters and objective goals are quantified by linear/nonlinear membership functions. A compromise solution is obtained by geometric programming method. If the decision maker is not satisfied with this result, he/she may try to update the current solution to his/her satisfactory solution. In this way we implement man-machine interactive procedure to solve the problem through geometric programming method. 1. Introduction In formulating an inventory problem, various parameters involve in the objective functions and constraints which are assigned by the decision maker (DM) from past experiences. But in real world situation, it is observed that the possible values of the parameters are often imprecise and ambiguous to the DM. In different situations, different circumstances, it takes different values. So, it is difficult to assign the precise values of the parameters. With this observation, it would be certainly more appropriate to interpret the DM’s understanding of the parameters as fuzzy numerical data which can be represented by fuzzy numbers. In the conventional approaches the objective goals are taken as deterministic. The objective goals, however, may not be exactly known. The target may vary to some extent, which is then represented by the tolerance value. Due to inexactness of the objective goals, the objective functions may be characterized by different types of membership functions. In a multiobjective nonlinear programming (MONLP) problem DM plays an important role to achieve his/her optimum goal. He/she has every right to choose or rechoose the suitable set of membership functions for different objective functions. He/she decides the types of fuzzy parameters and also free to assign the reference values of each objective functions/membership functions for the desired optimal solutions. In this way an interactive procedure can be established with the DM. Sakawa and Yano [1, 2] proposed a new technique to solve such type of problems. Zadeh [3] first introduced the concept of fuzzy set theory. Later on, Bellman and Zadeh [4] used the fuzzy set theory to the decision-making problem. Fuzzy set theory now has made an entry into the inventory control systems. Park [5] examined the EOQ formula in the fuzzy set theoretic perspective associating the fuzziness with the cost data. Roy and Maiti
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