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Search Results: 1 - 10 of 1216 matches for " Shri Niwas Tiwari "
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Balancing of Unbalanced Load and Power Factor Correction in Multi-phase (4-phase) Load Circuits using DSTATCOM
Zakir Husain,Ravinder Kumar Singh,Shri Niwas Tiwari
Lecture Notes in Engineering and Computer Science , 2010,
Bianchi-Type VI0 Bulk Viscous Fluid Models with Variable Gravitational and Cosmological Constants  [PDF]
Manoj K. Verma, Shri Ram
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.23041
Abstract: This paper deals with Bianchi type VI0 anisotropic cosmological models filled with a bulk viscous cosmic fluid in the presence of time-varying gravitational and cosmological constant. Physically realistic solutions of Einstein's field equations are obtained by assuming the conditions 1) the expansion scalar is proportional to shear scalar 2) the coefficient of the bulk viscosity is a power function of the energy density and 3) the cosmic fluid obeys the barotropic equation of state. We observe that the corresponding models retain the well established features of the standard cosmology and in addition, are in accordance with recent type Ia supernovae observations. Physical behaviours of the cosmological models are also discussed.
Linear Plus Linear Fractional Capacitated Transportation Problem with Restricted Flow  [PDF]
Kavita Gupta, Shri Ram Arora
American Journal of Operations Research (AJOR) , 2013, DOI: 10.4236/ajor.2013.36055

In this paper, a transportation problem with an objective function as the sum of a linear and fractional function is considered. The linear function represents the total transportation cost incurred when the goods are shipped from various sources to the destinations and the fractional function gives the ratio of sales tax to the total public expenditure. Our objective is to determine the transportation schedule which minimizes the sum of total transportation cost and ratio of total sales tax paid to the total public expenditure. Sometimes, situations arise where either reserve stocks have to be kept at the supply points, for emergencies or there may be extra demand in the markets. In such situations, the total flow needs to be controlled or enhanced. In this paper, a special class of transportation problems is studied where in the total transportation flow is restricted to a known specified level. A related transportation problem is formulated and it is shown that to each basic feasible solution which is called corner feasible solution to related transportation problem, there is a corresponding feasible solution to this restricted flow problem. The optimal solution to restricted flow problem may be obtained from the optimal solution to related transportation problem. An algorithm is presented to solve a capacitated linear plus linear fractional transportation problem with restricted flow. The algorithm is supported by a real life example of a manufacturing company.

Investigation of Surface Tryptophan of Protein by Selective Excitation at 305 nm  [PDF]
Vishvanath Tiwari, Monalisa Tiwari
Journal of Biophysical Chemistry (JBPC) , 2015, DOI: 10.4236/jbpc.2015.63009
Abstract: Intrinsic fluorescence of tryptophan is a powerful tool that is used to investigate structure, dynamics, and folding-unfolding of proteins. Here, we have signified the importance of selective monitoring of “surface” tryptophans from the “buried” tryptophans in a protein via selective excitation of surface tryptophan using light of 305 nm wavelength. We have also enlightened the effect of pH and temperature on the conformation of protein by selective excitation of surface tryptophan of protein using 305 nm light. The result concludes that this novel approach could be used to investigate surface tryptophan of protein selectively at diverse conditions.
Nanomechanical Analysis of Hybrid Silicones and Hybrid Epoxy Coatings—A Brief Review  [PDF]
Atul Tiwari
Advances in Chemical Engineering and Science (ACES) , 2012, DOI: 10.4236/aces.2012.21005
Abstract: This review article is written on the investigations of nanomechanical properties of coatings by using nanoindentation techniques. The focus is on the studies that were conducted on epoxy polymer, silicones and their hybrid materials. The article describes a large number of developmental studies that are conducted on coatings. Materials properties such as nanoindentation hardness, modulus, scratch, wear and viscoelastic behavior have been described. Moreover, the article summarizes various studies that mention the use of different nanoparticles in coating formulations that could improve the mechanical strength and service life span of the coatings. The mode and mechanism of material’s failure has been outlined and discussed.
A Novel High Speed FPGA Architecture for FIR Filter Design
Sachin B. Jadhav,Nikhil Niwas Mane
International Journal of Reconfigurable and Embedded Systems (IJRES) , 2012, DOI: 10.11591/ijres.v1i1.268
Abstract: This paper presents the details of hardware implementation of linear phase FIR filter using merged MAC architecture. Speed of convolution operation of FIR filter is improved using merged MAC architecture. By exploiting the reduced complexity made possible by the use of sparse powers of two partial products terms coefficients, an FIR filter tap can be implemented with 2B full adders, and 2B latches, where B is intermediate wordlegnth. Word and bit level parallelism allows high sampling rates, limited only by the full adder delay. The proposed architecture is based on binary tree constructed using modified 4:2 and 5:2 compressor circuits. Increasing the speed of operation is achieved by using higher modified compressors in critical path. Our objective of work is, to increase the speed of multiplication and accumulation operation by minimizing the number of combinational gates using higher n: 2 compressors, which is required more for Array multiplier at the time of implementation of array architecture. This novel architecture allows the implementation of high sampling rate filters of significant length on FPGA Spartan-3 device (XC3S400 PQ-208). The simulation result shows convolution output of digital FIR filter which is done using Questa Sim 6.4c Mentor Graphics tool. The experimental test of the proposed digital FIR filter is done using Spartan-3 device (XC3S400 PQ-208)
Tacrolimus ointment in the treatment of atopic hand eczema
Shri Joseph,Amichai Boaz
Indian Journal of Dermatology , 2006,
Bio-PCR based diagnosis of Xanthomonas campestris pathovars in black rot infected leaves of crucifers
Indian Phytopathology , 2011,
Abstract: Xanthomonas campestris pv campestris caused black rot disease of crucifers occurs worldwide and causes substantial losses under favorable conditions. A bio-PCR based method has been standardized for the rapid and reliable diagnosis of the black rot disease in crucifers. Primers were used specifically to amplify a 619bp fragment of the hrpF gene from X. campestris. To test specificity of primers, DNA of X. campestris pv. campestris, and other species of Xanthomonas
Elastic constants of nematic liquid crystals of uniaxial symmetry
Amit Srivastava,Shri Singh
Physics , 2004, DOI: 10.1088/0953-8984/16/41/001
Abstract: We study in detail the influence of molecular interactions on the Frank elastic constants of uniaxial nematic liquid crystals composed of molecules of cylindrical symmetry. A brief summary of the status of theoretical development for the elastic constants of nematics is presented. Considering a pair potential having both repulsive and attractive parts numerical calculations are reported for three systems MBBA, PAA and 8OCB. For these systems the length-to-width ratio ${x_0}$ is estimated from the experimentally proposed structure of the molecules. The repulsive interaction is represented by a repulsion between hard ellipsoids of revolution (HER) and the attractive potential is represented by the quadrupole and dispersion interactions. From the numerical results we observe that in the density range of nematics the contribution of the quadrupole and dispersion interactions are small as compared to the repulsive HER interaction. The inclusion of attractive interaction reduces the values of elastic constants ratios. The temperature variation of elastic constants ratios are reported and compared with the experimental values. A reasonably good agreement between theory and experiment is observed.
Adaptive Scheduling in Real-Time Systems Through Period Adjustment
Shri Prakash Dwivedi
Computer Science , 2012,
Abstract: Real time system technology traditionally developed for safety critical systems, has now been extended to support multimedia systems and virtual reality. A large number of real-time application, related to multimedia and adaptive control system, require more flexibility than classical real-time theory usually permits. This paper proposes an efficient adaptive scheduling framework in real-time systems based on period adjustment. Under this model periodic task can change their execution rates based on their importance value to keep the system underloaded. We propose Period_Adjust algorithm, which consider the tasks whose periods are bounded as well as the tasks whose periods are not bounded.
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