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Search Results: 1 - 10 of 149703 matches for " H. Kamath "
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Performance Analysis of Unbalance Radial Feeder with Time Varying Composite Load  [PDF]
Jagdish Prasad Sharma, H. Ravishankar Kamath
Journal of Power and Energy Engineering (JPEE) , 2015, DOI: 10.4236/jpee.2015.35005
Abstract: The focus of this paper is to present performance indices for unbalance radial feeder having different characteristic and composition of time varying static ZIP load models. These provide a framework for benchmarking of distribution automation projects. 15 minutes characteristics time interval for load flow and load modeling are considered to meet smart grid implementation criterion. A forward-backward sweep method is employed for load flow solution. Developed performance indices were illustrated on modified IEEE 37 node test feeder. Performance indices are useful for analysis, operational, planning and integration of stochastic renewable sources.
An improvised two in one syringe suction drain for surgeries of extremities.
Kamath J,Kamath R,Bansal H
Indian Journal of Plastic Surgery , 2005,
Abstract: Use of an improvised two in one syringe suction drain is being presented for a case with two adjacent non-communicating surgical wounds following release of Duputryn′s contracture primarily involving the longitudinal band of the palmar fascia of the hand, in line with the middle and ring finger. Instead of using two separate closed suction drainage system we modified our method by using a 3 way cannula which could accept 2 draining tubes to be connected to one 50cc syringe with negative suction pressure.
BER Calculation using Matlab Simulation for OFDM Transmission
Orlandos Grigoriadis,H. Srikanth Kamath
Lecture Notes in Engineering and Computer Science , 2008,
Abstract:
Node Level Power system State Estimation – A Parallel Processing Technique
H. Nagaraja Udupa,H. Ravishankar Kamath,Vikas Verma
International Journal of Advanced Electrical and Electronics Engineering , 2013,
Abstract: Real time State Estimation is very important part of any SCADA based Energy Management System (EMS). In the SE, the measurement equations for bus voltage magnitude, real and reactive power, are all nonlinear and the solution must be based on iterative methods like Newton-Raphson method. For real time application, SE should able to execute repetitively at short intervals. However, the Power System is highly distributed in nature and includes large number of connected buses. The various measurements taken at each bus are then transferred to the centre station where the SE computations are done using the system parameter, measured data and network equations. one can make out two very important points at this stage. In-order to improve the performance of SE, in practice, the large power system is split in to sub-networks and each sub-network is managed by the local control station in coordination with the Centre station – “Two level SE” [1][2][3][8][9][12]. Even though it reduces the computational time, still it is not suitable for real time applications. To overcome the above difficulty and obtain a computationally inexpensive real time update of the state vector, tracking state estimation algorithms have been proposed and discussed in various research papers available in the literature [4][6][13]. Many techniques such as AI [16][17], Multi-level SE [11][20] and a few other [5][10][14][15][18][19] are used in SE. The concept presented in this paper opens up an whole new approach, which can bring revolution in power system state monitoring and control.
Limited proteolysis of human histone deacetylase 1
Nayana Kamath, Paulina Karwowska-Desaulniers, Mary Kay H Pflum
BMC Biochemistry , 2006, DOI: 10.1186/1471-2091-7-22
Abstract: To characterize HDAC1 phosphorylation at S421 and S423, limited proteolysis of HDAC1 was performed for the first time. HDAC1 degraded without production of discrete fragments. By performing concentration-dependent proteolysis, HDAC1 double point mutants with disrupted phosphorylation at S421 and S423 displayed different trypsin sensitivities compared to wild type HDAC1. Unexpectedly, HDAC1 single point mutants with disrupted phosphorylation at either S421 or S423 demonstrated protease sensitivity similar to the wild type HDAC1.Concentration-dependent proteolysis experiments provide evidence that phosphorylation of S421 and S423 individually contribute to HDAC1 function. In addition, the limited proteolysis experiments support a model where associated proteins promote HDAC1 enzymatic activity, reinforcing the importance of protein interactions in HDAC1 structure and function. Finally, because HDAC1 does not display distinct regions of protease sensitivity, the proteolysis studies suggest that HDAC1 comprises inter-related structural regions.Histone deacetylase (HDAC) proteins play a critical role in regulating gene expression in vivo by altering the accessibility of genomic DNA to transcription factors. Specifically, HDAC proteins remove the acetyl group of acetyl-lysine residues on histones, which can result in nucleosomal remodelling [1]. Due to their governing role in gene expression, HDAC proteins are associated with a variety of cellular events, including cell cycle regulation, cell proliferation, differentiation and cancer development [2-5]. In fact, HDAC inhibitors reduce tumour growth in various human tissues, including lung, stomach, breast, and prostrate [6]. As a result, small molecule inhibitors of HDAC enzymatic activity are currently being exploited as potential cancer drugs [7-9].The study of HDAC proteins in cancer is complicated by the identification of eleven human HDAC proteins that are sensitive to small molecule inhibitors [10]. Although it is un
(2E)-3-(3-Bromophenyl)-1-(4-chlorophenyl)prop-2-en-1-one: a non-merohedral twin
Hongqi Li,K. Prakash Kamath,B. Narayana,H. S. Yathirajan
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809027615
Abstract: In the title compound, C15H10BrClO, the molecule adopts an E configuration with respect to the C=C double bond and the dihedral angle between the aromatic ring planes is 3.98 (16)°. In the crystal, inversion dimers linked by pairs of C—H...O bonds are seen and weak π–π stacking [centroid–centroid separation = 3.8776 (19) ] may further consolidate the structure. The crystal studied was a non-merohedral twin with a ratio of the twin components of 0.9093 (13):0.0907 (13). The twin operation is a twofold rotation around c*.
Exfoliative Dermatitis - A Clinical Study
Nazeer Mohamed,Ganesh Kamath H,Shetty Narendra J,Nandakishore B
Indian Journal of Dermatology , 2002,
Abstract: A total number of thirty cases of exfoliative dermatitis was taken up for clinical evaluation with particular emphasis on the cause of the disease and to study systemic involvement. Eczema (46.6%) was the most common cause followed by psoriasis (16.6%). Elderly males were commonly affected with a mean age of 50.9 years.
Intraoperatively Diagnosed Tracheal Tear after Using an NIM EMG ETT with Previously Undiagnosed Tracheomalacia
Minal Joshi,Simon Mardakh,Joel Yarmush,H. Kamath
Case Reports in Anesthesiology , 2013, DOI: 10.1155/2013/568373
Abstract:
Optically visible post-AGB/RGB stars and young stellar objects in the Small Magellanic Cloud: candidate selection, spectral energy distributions and spectroscopic examination
D. Kamath,P. R. Wood,H. Van Winckel
Physics , 2014, DOI: 10.1093/mnras/stt2033
Abstract: We have carried out a search for optically visible post-AGB candidates in the Small Magellanic Cloud (SMC). We used mid-IR observations from the Spitzer Space Telescope to select optically visible candidates with a mid-IR excess. We obtained low-resolution optical spectra for 801 candidates. After removing contaminants and poor quality spectra, the final sample comprised of 63 post-AGB/RGB candidates of A - F spectral type. Using the spectra, we estimated the stellar parameters: effective temperature, surface gravity and [Fe/H]. We also estimated the reddening and deduced the luminosity using the stellar parameters combined with photometry. Based on a luminosity criterion, 42 of these 63 sources were classified as post-RGB candidates and the remaining as post-AGB candidates. From the spectral energy distributions we found that 6 of the 63 post-AGB/RGB candidates have a circumstellar shell suggesting that they are single stars, while 27 of them have a surrounding disc, suggesting that they are binaries. For the remaining candidates the nature of the circumstellar environment was unclear. Variability is displayed by 38 post-AGB/RGB candidates with common variability types being the Population II Cepheids (including RV-Tauri stars) and semi-regular variables. This study has also revealed a new s-process enriched RV Tauri star (J005107.19-734133.3). From the numbers of post-AGB/RGB stars in the SMC, we were able to estimate evolutionary rates that are in good agreement with the stellar evolution models with mass loss in the post-AGB phase and re-accretion in the post-RGB phase. This study also resulted in a new sample of 40 luminous young stellar objects (YSOs) of A - F spectral type. Additionally, we also identified a group of 63 objects whose spectra are dominated by emission lines and in some cases, a UV continuum. These objects are likely to be either hot post-AGB/RGBs or luminous YSOs.
Magellanic Cloud stars with TiO bands in emission: binary post-RGB/AGB stars or young stellar objects?
P. R. Wood,D. Kamath,H. Van Winckel
Physics , 2013, DOI: 10.1093/mnras/stt1296
Abstract: Fourteen stars from a sample of Magellanic Cloud objects selected to have a mid-infrared flux excess have been found to also show TiO bands in emission. The mid-infrared dust emission and the TiO band emission indicate that these stars have large amounts of hot circumstellar dust and gas in close proximity to the central star. The luminosities of the sources are typically several thousand L_sun while the effective temperatures are 4000-8000 K. Such stars could be post-AGB stars of mass 0.4-0.8 M_sun or pre-main-sequence stars (young stellar objects) with masses of 7-19 M_sun. If the stars are pre-main-sequence stars, they are substantially cooler and younger than stars at the birth line where Galactic protostars are first supposed to become optically visible out of their molecular clouds. They should therefore be hidden in their present evolutionary state. The second explanation for these stars is that they are post-AGB or post-RGB stars that have recently undergone a binary interaction when the red giant of the binary system filled its Roche lobe. Being oxygen-rich, they have gone through this process before becoming carbon stars. Most of the stars vary slowly on timescales of 1000 days or more suggesting a changing circumstellar environment. Apart from the slow variations, most stars also show variability with periods of tens to hundreds of days. One star shows a period that is rapidly decreasing and we speculate that this star may have accreted a large blob of gas and dust onto a disk whose orbital radius is shrinking rapidly. Another star has Cepheid-like pulsations of rapidly increasing amplitude suggesting a rapid rate of evolution. Seven stars show quasi-periodic variability and one star has a light curve similar to that of an eclipsing binary.
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