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Search Results: 1 - 10 of 709 matches for " Chakrabarty Subrata "
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A Conceptual Model for Bidirectional Service, Information and Product Quality in an IS Outsourcing Collaboration Environment
Subrata Chakrabarty
Quantitative Finance , 2009, DOI: 10.1109/HICSS.2006.7
Abstract: This paper advances theory on the process of collaboration between entities and its implications on the quality of services, information, and/or products (SIPs) that the collaborating entities provide to each other. It investigates the scenario of outsourced IS projects (such as custom software development) where the extent of collaboration between a client and vendor is high. Using the social exchange theory, the proposed conceptual model tries to establish the "bidirectional" nature of SIP quality in a collaborative environment, where the SIPs exchanged are possibly "dependent" on each other, and if any entity wishes to receive high SIP quality then it should make efforts to provide high SIP quality in return too. Furthermore, it advocates increasing efforts to link financial stakes (tangible or intangible monetary benefits or risks) to the quality of SIP being continuously exchanged throughout the project lifecycle.
Quantizing magnetic field and quark-hadron phase transition in a neutron star
Debades Bandyopadhyay,Somenath Chakrabarty,Subrata Pal
Physics , 1997, DOI: 10.1103/PhysRevLett.79.2176
Abstract: We investigate the influence of a strong magnetic field on various properties of neutron stars with quark-hadron phase transition. The one-gluon exchange contribution in a magnetic field is calculated in a relativistic Dirac-Hartree-Fock approach. In a magnetic field of $5\times 10^{18}$G in the center of the star, the overall equation of state is softer in comparison to the field-free case resulting in the reduction of maximum mass of the neutron star.
Dense nuclear matter in a strong magnetic field
Somenath Chakrabarty,Debades Bandyopadhyay,Subrata Pal
Physics , 1997, DOI: 10.1103/PhysRevLett.78.2898
Abstract: We investigate in a relativistic Hartree theory the gross properties of cold symmetric nuclear matter and nuclear matter in beta equilibrium under the influence of strong magnetic fields. If the field strengths are above the critical values for electrons and protons, the respective phase spaces are strongly modified. This results in additional binding of the systems with distinctively softer equations of state compared to the field free cases. For magnetic field $\sim 10^{20}$ Gauss and beyond, the nuclear matter in beta equilibrium practically converts into a stable proton rich matter.
Strong magnetic field in a protoneutron star
Subrata Pal,Debades Bandyopadhyay,Somenath Chakrabarty
Physics , 1998, DOI: 10.1088/0954-3899/25/11/102
Abstract: We investigate the influence of a strong interior magnetic field on the structure and composition of a protoneutron star allowing quark-hadron phase transition. In contrast to protoneutron stars with noninteracting quark phase, the stars with interacting quark phase have smaller maximum star masses than those of neutrino-free stars. The strong field makes the overall equation of state softer compared to the field-free case favoring the evolution of a protoneutron star more towards a neutron star than a black hole.
Guided fine needle aspiration cytology of retroperitoneal masses - Our experience
Gangopadhyay Mimi,Bhattacharyya Nirmal,Ray Sailes,Chakrabarty Subrata
Journal of Cytology , 2011,
Abstract: Background : Early pathological classification of retroperitoneal masses is important for pin-point diagnosis and timely management. Aims : This study was done to evaluate the usefulness and drawbacks of guided fine needle aspiration cytology (FNAC) of retroperitoneal masses covering a period of two years with an intention to distinguish between neoplastic and non-neoplastic lesions and to correlate with histologic findings. Materials and Methods : FNAC was done under radiological guidance in all cases using long needle fitted with disposable syringe. Appropriate staining was done and cytology was correlated with histology which was taken as the gold standard for comparison. Results : Fifty-one patients who presented with retroperitoneal masses were studied. Forty-four lesions were malignant cytologically and 7 were inflammatory (tuberculous). According to radiological and cytologic findings, we classified our cases into four groups: renal tumors, retroperitoneal lymphadenopathy, germ cell tumors, soft tissue tumors. Except for cases of non-Hodgkin lymphoma (NHL) and metastatic lesions, we had sensitivity and specificity of 100%. In NHL the sensitivity and specificity were both 50%. In cases of metastatic adenocarcinoma, the sensitivity and specificity were 84.6% and 81.8%, respectively. Conclusions : Ignoring the pitfalls, guided FNAC is still an inexpensive and reliable method of early diagnosis of retroperitoneal lesions.
Cytological diagnosis of adamantinoma of long bone in a 78-year-old man
Gangopadhyay Mimi,Pramanik Raghunath,Chakrabarty Subrata,Bera Pranati
Journal of Cytology , 2011,
Abstract: A clinicohistopathological study of a rare case of adamantinoma of long bone in a 78-year-old patient is presented. The cytological features when evaluated in conjunction with clinical and radiologic features are sufficiently diagnostic. The primary knowledge of its existence and knowledge of its cytological features are important for a correct preoperative cytological diagnosis.
A second monoclinic polymorph of 2-amino-4,6-dichloropyrimidine
Hoong-Kun Fun,Suchada Chantrapromma,Subrata Jana,Rinku Chakrabarty
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808023714
Abstract: The title chloro-substituted 2-aminopyrimidine, C4H3Cl2N3, is a second monoclinic polymorph of this compound which crystallizes in the space group C2/c. The structure was previously reported [Clews & Cochran (1948). Acta Cryst. 1, 4–11] in the space group P21/a. There are two crystallographically independent molecules in the asymmetric unit and each molecule is planar. The dihedral angle between the two pyrimidine rings is 30.71 (12)°. In the crystal structure, molecules are linked via N—H...N intermolecular hydrogen bonds, forming infinite one-dimensional chains along the a axis. These hydrogen bonds generate R22(8) ring motifs. The chains are stacked along the b axis.
Rapid cooling of magnetized neutron stars
Debades Bandyopadhyay,Somenath Chakrabarty,Prantick Dey,Subrata Pal
Physics , 1998, DOI: 10.1103/PhysRevD.58.121301
Abstract: The neutrino emissivities resulting from direct URCA processes in neutron stars are calculated in a relativistic Dirac-Hartree approach in presence of a magnetic field. In a quark or a hyperon matter environment, the emissivity due to nucleon direct URCA processes is suppressed relative to that from pure nuclear matter. In all the cases studied, the magnetic field enhances emissivity compared to the field-free cases.
Hoong-Kun Fun,Samuel Robinson Jebas,Subrata Jana,Rinku Chakrabarty
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808006211
Abstract: In the title compound, C18H16N2O3, the dihedral angle between the naphthalene ring system and the pyridyl ring is 18.1 (8)°. The molecules are interconnected via C—H...O and O—H...O hydrogen bonds. Inversion-related molecules are linked by O—H...O hydrogen bonds into cyclic centrosymmetric R22(22) dimers. Intramolecular N—H...O hydrogen bonding produces an S(5) ring motif. The crystal structure is further stabilized by weak C—H—π interactions.
A Time History Method for Analysing Operational Piping Vibrations  [PDF]
Subrata Saha
World Journal of Mechanics (WJM) , 2012, DOI: 10.4236/wjm.2012.26038
Abstract: Vibration failure of piping is a serious problem and a matter of concern for safety and reliability of plant operations. Fatigue is the main cause of such failures. Due to the complexity of the phenomenon no closed form design solutions are available. In our study an analytical technique based on the theory of vibrations in the time domain has been presented. Using the inverse theory, the problem has been reduced to a system of Volterra Integral equations to be solved simultaneously at every time step. The solution of the inverse problem may be used in the conventional method to calculate stresses and end reactions which are important from the perspective of engineering design and condition monitoring. The method is robust, simple and can be easily adopted by practicing engineers.
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