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Search Results: 1 - 10 of 2942 matches for " Abhishek Agarwal "
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Security in Locally Repairable Storage
Abhishek Agarwal,Arya Mazumdar
Mathematics , 2015,
Abstract: In this paper we extend the notion of {\em locally repairable} codes to {\em secret sharing} schemes. The main problem that we consider is to find optimal ways to distribute shares of a secret among a set of storage-nodes (participants) such that the content of each node (share) can be recovered by using contents of only few other nodes, and at the same time the secret can be reconstructed by only some allowable subsets of nodes. As a special case, an eavesdropper observing some set of specific nodes (such as less than certain number of nodes) does not get any information. In other words, we propose to study a locally repairable distributed storage system that is secure against a {\em passive eavesdropper} that can observe some subsets of nodes. We provide a number of results related to such systems including upper-bounds and achievability results on the number of bits that can be securely stored with these constraints.
The Dilatation Operator of $\cal N$ $=$ 4 SYM and Classical Limits of Spin Chains and Matrix Models
Abhishek Agarwal,Sarada. G. Rajeev
Physics , 2004, DOI: 10.1142/S0217732304015725
Abstract: A study of the one loop dilatation operator in the scalar sector of $\cal N$ $=$ 4 SYM is presented. The dilatation operator is analyzed from the point of view of Hamiltonian matrix models. A Lie algebra underlying operator mixing in the planar large $N$ limit is presented, and its role in understanding the integrability of the planar dilatation operator is emphasized. A classical limit of the dilatation operator is obtained by considering a contraction of this Lie algebra, leading to a new way of constructing classical limits for quantum spin chains. An infinite tower of local conserved charges is constructed in this classical limit purely within the context of the matrix model. The deformation of these charges and their relation to the charges of the spin chain is also elaborated upon.
Supersymmetry and Mass Gap in 2+1 Dimensions: A Gauge Invariant Hamiltonian Analysis
Abhishek Agarwal,V. P. Nair
Physics , 2012, DOI: 10.1103/PhysRevD.85.085011
Abstract: A Hamiltonian formulation of Yang-Mills-Chern-Simons theories with $0\leq N\leq 4$ supersymmetry in terms of gauge-invariant variables is presented, generalizing earlier work on nonsupersymmetric gauge theories. Special attention is paid to the volume measure of integration (over the gauge orbit space of the fields) which occurs in the inner product for the wave functions and arguments relating it to the renormalization of the Chern-Simons level number and to mass-gaps in the spectrum of the Hamiltonians are presented. The expression for the integration measure is consistent with the absence of mass gap for theories with extended supersymmetry (in the absence of additional matter hypermultiplets and/or Chern-Simons couplings), while for the minimally supersymmetric case, there is a mass-gap, the scale of which is set by a renormalized level number, in agreement with indications from existing literature. The realization of the supersymmetry algebra and the Hamiltonian in terms of the gauge invariant variables is also presented.
Polarized Electromagnetic Radiation from Spatially Correlated Sources
Abhishek Agarwal,Pankaj Jain,Jagdish Rai
Physics , 1999,
Abstract: We consider the effect of spatial correlations on sources of polarized electromagnetic radiation. The sources, assumed to be monochromatic, are constructed out of dipoles aligned along a line such that their orientation is correlated with their position. In one representative example, the dipole orientations are prescribed by a generalized form of the standard von Mises distribution for angular variables such that the azimuthal angle of dipoles is correlated with their position. In another example the tip of the dipole vector traces a helix around the symmetry axis of the source, thereby modelling the DNA molecule. We study the polarization properties of the radiation emitted from such sources in the radiation zone. For certain ranges of the parameters we find a rather striking angular dependence of polarization. This may find useful applications in certain biological systems as well as in astrophysical sources.
Performance Analysis of an Existing BIPV System for Indian Climatic Conditions
Abhishek Ranjan, Swapnil Dubey, Basant Agarwal and G. N. Tiwari
The Open Renewable Energy Journal , 2008, DOI: 10.2174/1876387100901010001]
Abstract: In this communication, an attempt has been made for evaluating the performance of an existing BIPV system for Indian climatic conditions, considering four weather conditions (a, b, c and d type) for five different cities (New Delhi, Bangalore, Mumbai, Srinagar, and Jodhpur) of India. In this paper, first solar radiation is calculated on inclined roof (30o), south, east and west facades (90o) of the building and then fourteen different possible series and parallel combinations of PV integrated air ducts mounted on roof have been considered for the evaluation of thermal and electrical gain. It is found that, the average electrical efficiency of the system is 9.64%. Annual thermal and electrical gain obtained for the best combination (11 ducts are connected in parallel each having three PV modules) is 13.42 MWh and 4.38 MWh respectively for New Delhi condition. It is a self sustainable system where electrical energy is used for lighting purpose and thermal energy is used for space heating and drying.
Scorpion Sting Envenomation With Pulmonary Oedema & Hypotension: Treated With NTG & Inotropic Support: A Case Report
Abhishek Srivastava,Ankur Jain,Ankit Agarwal,RK Verma
Indian Anaesthetists' Forum , 2009,
Abstract: Scorpion sting is a major health problem in underdeveloped countries like India. It may present with mild local pain to severe systemic symptoms and need of I.C.U. care and mechanical ventilation.Scorpion envenomation presents with increased systemic vascular resistance and hypertension, but in cases of severe envenomation it may present with hypotension and pulmonary oedema
Bilateral Pleural Effusions due to Pulmonary Amyloidosis as the Presenting Manifestation of Multiple Myeloma
Abhishek Agarwal,Sandeep Singla,Meghana Bansal,Bijay Nair
Mediterranean Journal of Hematology and Infectious Diseases , 2012, DOI: 10.4084/mjhid.2012.
Abstract: Multiple myeloma is a hematologic malignancy of plasma cell origin. Pleural effusion may develop in the setting of myeloma due to various reasons but is extremely uncommon as a presenting symptom. A 69-year-old Caucasian man presented with pleural effusions of undetermined etiology after extensive work up, and multiple failed pleurodesis. Lung biopsy revealed pulmonary amyloidosis and led to the diagnosis of multiple myeloma. Patient was started on chemotherapy but died within 6 weeks of his diagnosis due to multiorgan failure. Pulmonary amyloidosis should be suspected as a cause of intractable pleural effusions, even in patient who do not have evidence of lung involvement on imaging studies or typical features of multiple myeloma. Pleural effusions due to amyloidosis are often refractory to treatment, and a high index of suspicion is required for early diagnosis and treatment.
Expressions of Fas/DcR3 and RGD-FasL mediated apoptosis in pituitary adenomas
Chen Lukui,Tian Xinhua,Li Wenzhu,Agarwal Abhishek
Neurology India , 2009,
Abstract: Purpose: To detect the expressions of Fas/DcR3 and to investigate the cytotoxic effects of RGD-FasL on pituitary adenoma cells. Materials and Methods: Fas/DcR3 mRNAs were detected by Reverse transcription polymerase chain reaction (RT-PCR) and their surface expressions were measured by flow cytometry. Cytotoxicities exerted by FasL and newly-constructed RGD-FasL on tumor cells were measured with 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. The apoptotic cells were examined by electron microscopy and the induced apoptosis was determined by agarose gel electrophoresis. The cell cycle was assessed by flow cytometry with ANNEXIN V FITC/PI. The expressions of caspases, Bcl-2, RANKL and JNK2 were detected by Western blotting. Results: Fas/DcR3 was expressed in GH3/MMQ/AtT20 cells. The cytotoxic effects of RGD-FasL on tumor cells were seen in a dose-dependent manner. These cells showed the same sensitivity to RGD-FasL as to FasL. RGD-FasL induced apoptosis and G1/G0 arrest. The expressions of caspase-8/9/3, RANKL, JNK2 were increased while that of Bcl-2 was decreased with treatment of RGD-FasL. Conclusions: Fas can be a novel target for the treatment of pituitary adenomas. RGD-FasL induces apoptosis of pituitary adenoma cells through caspase activation.
Synthesis, Structural and Optical Study of CdS Nanoparticles Doped with Different Concentration of Cu
Ankit Goyal,Vinay Sharma,Abhishek Sharma,Ravi Agarwal
Journal of Nano- and Electronic Physics , 2011,
Abstract: Semiconductor nanoparticles have received much interest for their optical and electronic properties. CdS nanoparticles have been synthesized by chemical synthesis method using EDTA as a capping agent. Different concentration of Cu is doped in CdS nanoparticles during synthesis. X-ray diffraction (XRD) measurements showed that the nanoparticles have the structure of cubic phase. The broadening of XRD patterns indicates that the prepared samples are nanostructured. The optical absorption of the CdS nanoparticles is studied in the range of 200-800 nm. The optical properties of CdS nano particle were investigated by the UV-Vis absorption spectroscopy and Photoluminescence. The band gap of CdS nano particles has been determined.
Smart Grid, Smart Controllers and Home Energy Automation—Creating the Infrastructure for Future  [PDF]
Abhishek Khanna
Smart Grid and Renewable Energy (SGRE) , 2012, DOI: 10.4236/sgre.2012.33024
Abstract: Integration of unpredictable renewable power sources into the Grid is leading to the development of wide area control algorithms and smart grid. Smart meters are the first step in the building a smart consumer interface. Much more, however, would be required in building a smart grid than just smart meters. This paper explores the conceptual architecture of smart grid. It highlights the need for additional infrastructure to realize full potential of smart grid. The information presented in this paper is an attempt to uncover what the future in smart grid could be and what infrastructure would be required to tap its potential. As smart grid evolves, more functionality would be built in the constituents. The paper also proposes mathematical basis for some of the controller algorithms.
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