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48 results on '"Kumar, Krishna S."'

1. The P2 Experiment - A future high-precision measurement of the electroweak mixing angle at low momentum transfer

Author

Becker, Dominik, Bucoveanu, Razvan, Grzesik, Carsten, Kempf, Ruth, Imai, Kathrin, Molitor, Matthias, Tyukin, Alexey, Zimmermann, Marco, Armstrong, David, Aulenbacher, Kurt, Baunack, Sebastian, Beminiwattha, Rakitha, Berger, Niklaus, Bernhard, Peter, Brogna, Andrea, Capozza, Luigi, Dusa, Silviu Covrig, Deconinck, Wouter, Diefenbach, Jürgen, Erler, Jens, Gal, Ciprian, Gläser, Boris, Gou, Boxing, Gradl, Wolfgang, Gericke, Michael, Gorchtein, Mikhail, Imai, Yoshio, Kumar, Krishna S., Maas, Frank, Mammei, Juliette, Pan, Jie, Pandey, Preeti, Paschke, Kent, Perić, Ivan, Pitt, Mark, Rahman, Sakib, Riordan, Seamus, Piñeiro, David Rodríguez, Sfienti, Concettina, Sorokin, Iurii, Souder, Paul, Spiesberger, Hubert, Thiel, Michaela, Tyukin, Valery, and Weitzel, Quirin

Subjects
Nuclear Experiment, High Energy Physics - Experiment, High Energy Physics - Phenomenology, Physics - Instrumentation and Detectors
Abstract

This article describes the future P2 parity-violating electron scattering facility at the upcoming MESA accelerator in Mainz. The physics program of the facility comprises indirect, high precision search for physics beyond the Standard Model, measurement of the neutron distribution in nuclear physics, single-spin asymmetries stemming from two-photon exchange and a possible future extension to the measurement of hadronic parity violation. The first measurement of the P2 experiment aims for a high precision determination of the weak mixing angle to a precision of 0.14% at a four-momentum transfer of Q^2 = 4.5 10^{-3} GeV^2. The accuracy is comparable to existing measurements at the Z pole. It comprises a sensitive test of the standard model up to a mass scale of 50 TeV, extendable to 70 TeV. This requires a measurement of the parity violating cross section asymmetry -39.94 10^{-9} in the elastic electron-proton scattering with a total accuracy of 0.56 10^-9 (1.4 %) in 10,000 h of 150 \micro A polarized electron beam impinging on a 60 cm liquid H_2 target allowing for an extraction of the weak charge of the proton which is directly connected to the weak mixing angle. Contributions from gamma Z-box graphs become small at the small beam energy of 155 MeV. The size of the asymmetry is the smallest asymmetry ever measured in electron scattering with an unprecedented goal for the accuracy. We report here on the conceptual design of the P2 spectrometer, its Cherenkov detectors, the integrating read-out electronics as well as the ultra-thin, fast tracking detectors. There has been substantial theory work done in preparation of the determination of the weak mixing angle. The further physics program in particle and nuclear physics is described as well., Comment: Invited EPJ A Manuscript, many figures, large file size

Published
2018
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2. An RF-only ion-funnel for extraction from high-pressure gases

Author

Brunner, Thomas, Fudenberg, Daniel, Varentsov, Victor, Sabourov, Amanda, Gratta, Giorgio, Dilling, Jens, DeVoe, Ralph, Sinclair, David, Fairbank Jr., William, Albert, Joshua B, Auty, David J, Barbeau, Phil S, Beck, Douglas, Benitez-Medina, Cesar, Breidenbach, Martin, Cao, Guofu F, Chambers, Christopher, Cleveland, Bruce, Coon, Matthew, Craycraft, Adam, Daniels, Timothy, Daugherty, Sean J, Didberidze, Tamar, Dolinski, Michelle J, Dunford, Matthew, Fabris, Lorenzo, Farine, Jacques, Feldmeier, Wolfhart, Fierlinger, Peter, Gornea, Razvan, Graham, Kevin, Heffner, Mike, Hughes, Mitchell, Jewell, Michael, Jiang, Xiaoshan S, Johnson, Tessa N, Johnston, Sereres, Karelin, Alexander, Kaufman, Lisa J, Killick, Ryan, Koffas, Thomas, Kravitz, Scott, Kruecken, Reiner, Kuchenkov, Alexey, Kumar, Krishna S, Leonard, Douglas S, Leonard, Francois, Licciardi, Caio, Lin, Yi-Hsuan H, Ling, Jiajie, MacLellan, Ryan, Marino, Michael G, Mong, Brian, Moore, David, Odian, Allen, Ostrovskiy, Igor, Ouellet, Christian, Piepke, Andreas, Pocar, Andrea, Retiere, Fabrice, Rowson, Peter C, Rozo, Maria P, Schubert, Alexis, Smith, Erica, Stekhanov, Victor, Tarka, Michal, Tolba, Tamer, Tosi, Delia, Twelker, Karl, Vuilleumier, Jean-Luc L, Walton, Josiah, Walton, Timothy, Weber, Manuel, Wen, Liangjian J, Wichoski, Ubi, Yang, Liang, and Yen, Yung-Ruey

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

An RF ion-funnel technique has been developed to extract ions from a high-pressure (10 bar) noble-gas environment into vacuum ($10^{-6}$ mbar). Detailed simulations have been performed and a prototype has been developed for the purpose of extracting $^{136}$Ba ions from Xe gas with high efficiency. With this prototype, ions have been extracted for the first time from high-pressure xenon gas and argon gas. Systematic studies have been carried out and compared to the simulations. This demonstration of extraction of ions with mass comparable to that of the gas generating the high-pressure into vacuum has applications to Ba tagging from a Xe-gas time-projection chamber (TPC) for double beta decay as well as to the general problem of recovering trace amounts of an ionized element in a heavy (m$>40$ u) carrier gas.

Published
2014
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12. Pyrolyzed pencil graphite coated cellulose paper as an interlayer: An effective approach for high-performance lithium-sulfur battery

Author

Rani, Poonam, Kumar, Krishna S., Pathak, Anil D., Sharma, Chandra Shekhar, Rani, Poonam, Kumar, Krishna S., Pathak, Anil D., and Sharma, Chandra Shekhar

Abstract

Lithium-sulfur (Li-S) battery is next generation battery technology but it's commercialization is obstructed primarily due to the shuttling effect of lithium polysulfides (LiPSs). Herein, we report an effective approach using pencil coated pyrolyzed cellulose filter paper as an interlayer to suppress the LiPSs dissolution into the electrolyte and thus allowing effective utilization of active sulfur cathode. Here, the binder clay particles (mainly SiO2) of pencil graphite facilitate the adsorption of LiPSs, whereas graphite increases the electrical conductivity and acts as a physical barrier to LiPSs. To investigate further, we utilize three different grades of pencil (4B, HB, 5H) which vary in terms of clay (SiO2) composition. It is observed that the HB pencil coated interlayer has the right balance of silica and graphite, which results in an impressive initial capacity of 1352 and 995 mAh g−1 at the current density of 0.1 and 0.5 A g−1, respectively. The cell exhibit high cycling stability of 900 mAh g−1 at 1 A g−1 (3.0 C) for 350 cycles with a slow capacity decay of 0.07% per cycle. The phenomenon of LiPSs adsorption is further understood using post-cycling analysis, H-cell adsorption testing, and shuttle factor calculation for the development of commercial Li-S batteries. © 2020 Elsevier B.V.

Published
2020

16. Effect of deprogramming splint and occlusal equilibration on condylar position of TMD patients - A CBCT assessment.

Author

Ramachandran, Anu, Jose, Renju, Tunkiwala, Ali, Varma R, Beena, M. Shanmugham, Aravind, Nair, Priya K., Kumar, Krishna S., and Sam, Lisa Maria

Subjects
OCCLUSAL adjustment, PATIENT positioning, RANGE of motion of joints, SYMPTOMS, TEMPOROMANDIBULAR disorders
Abstract

Objective: Assessment of clinical symptoms and condylar position of TMD patients using CBCT imaging with deprogramming splint therapy and occlusal equilibration. The hypothesis tested was the alleviation of symptoms of TMD with possible changes in condylar position occurs with this treatment.Methods: The condylar position of 12 TMD patients was observed from CBCT images, and clinically, symptom severity score, mouth opening, and range of motion were compared pre- and post-treatment.Results: All patients reported a statistically significant decrease in the symptom severity score and increase in mouth opening and range of motion (p < .05). A significant decrease was only achieved in the left anterior joint space (p < .05).Conclusion: Deprogramming splint therapy and occlusal equilibration benefitted patients with a reduction in clinical symptoms, and minor changes in condylar position were observed. [ABSTRACT FROM AUTHOR]

Published
2021
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18. The P2 experiment

Author

Becker, Dominik, primary, Bucoveanu, Razvan, additional, Grzesik, Carsten, additional, Imai, Kathrin, additional, Kempf, Ruth, additional, Molitor, Matthias, additional, Tyukin, Alexey, additional, Zimmermann, Marco, additional, Armstrong, David, additional, Aulenbacher, Kurt, additional, Baunack, Sebastian, additional, Beminiwattha, Rakitha, additional, Berger, Niklaus, additional, Bernhard, Peter, additional, Brogna, Andrea, additional, Capozza, Luigi, additional, Covrig Dusa, Silviu, additional, Deconinck, Wouter, additional, Diefenbach, Jürgen, additional, Dunne, James, additional, Erler, Jens, additional, Gal, Ciprian, additional, Gericke, Michael, additional, Gläser, Boris, additional, Gorchtein, Mikhail, additional, Gou, Boxing, additional, Gradl, Wolfgang, additional, Imai, Yoshio, additional, Kumar, Krishna S., additional, Maas, Frank, additional, Mammei, Juliette, additional, Pan, Jie, additional, Pandey, Preeti, additional, Paschke, Kent, additional, Perić, Ivan, additional, Pitt, Mark, additional, Rahman, Sakib, additional, Riordan, Seamus, additional, Rodríguez Piñeiro, David, additional, Sfienti, Concettina, additional, Sorokin, Iurii, additional, Souder, Paul, additional, Spiesberger, Hubert, additional, Thiel, Michaela, additional, Tyukin, Valery, additional, and Weitzel, Quirin, additional

Published
2018
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21. Parity-Violating Electron Scattering

Author

Kumar, Krishna S. and MOLLER Collaboration

Subjects
spinless [nucleus], precision measurement [Weinberg angle], longitudinal [polarization], neutral current, electroweak interaction, polarization [electron], new physics, Physics, High Energy Physics::Experiment, violation [parity], deep inelastic scattering [electron deuteron], scattering [electron nucleus]
Abstract

Contribution to Proceedings, Proc. of PANIC 2014, 433 - 438; DESY-PROC-2014-02; ISSN 1435-8077

Published
2014
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23. Increased watermark-to-host correlation of uniform random phase watermarks in audio signals

Author

Kumar, Krishna S and Sreenivas, Thippur

Subjects
Electrical Communication Engineering
Abstract

We analyze the watermark-to-host correlation (WHC) of random phase watermarks, in the context of additive embedding and blind correlation-detection of the watermark in audio signals. Interestingly, we find that WHC is higher when a legitimate watermark is present in the audio signal. Instead of trying to minimize the WHC, one could also attempt to harness this increased correlation in order to result in better detection performance. The analysis shows that uniformly distributed phase difference (between the host signal and the watermark) provides maximum advantage. It is also verified that, a uniformly distributed watermark phase provides the most advantage, experimented over a variety of audio signals.

Published
2007

24. Analysis of Increased Correlation in Blind Audio Watermark Detection

Author

Kumar, Krishna S and Sreenivas, TV

Subjects
Electrical Communication Engineering, Data_MISCELLANEOUS
Abstract

Audio watermarks are often made signal-dependant to keep them inaudible in the host signals. Blind watermark detectors, which do not have access to the unwatermarked signal, may seem handicapped, because an approximate watermark has to be re-derived from the watermarked signal. Referring to the exact watermark scenario as a semi-blind detector, some reduction in performance is anticipated in blind detection over semi-blind detection. An earlier experimental work revealed that the statistical performance of the blind detector is better than that of the semi-blind detector. It is found that the re-derived watermark is better correlted to the host signal and hence, it leads to better detection performance. It is confirmed that this happens only if the embedded watermark is the same as the examined watermark. This paper focuses on an analytical treatment of the problem. The conclusions from this analysis justify the experimental observation. Clues obtained from this investigation will help in better designs of audio watermarking schemes.

Published
2004

36. Parity-Violating Mo\ller Scattering.

Author

Kumar, Krishna S.

Subjects
*PARTICLES (Nuclear physics), *COLLIDERS (Nuclear physics), *PARTICLE accelerators, *HADRON colliders, *IONS
Abstract

Precision measurements of electroweak observables at Q2

Published
2009
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38. Spin Physics Summary.

Author

Di Nezza, Pasquale, Kumar, Krishna S., Stratmann, Marco, Smith, W. H., and Dasu, S. R.

Subjects
*ROTATIONAL motion, *LEPTONS (Nuclear physics), *PARTICLES (Nuclear physics), *PROTON scattering, *NUCLEON-nucleon scattering, *NUCLEAR physics
Abstract

We present a brief summary of recent results presented at the Spin Physics Working Group at DIS 2005. The Spin Physics parallel sessions hosted a total of 33 talks equally distributed between experimental and theoretical aspects. An improved theoretical understanding in several recent topics of interest in this field is now evident, especially in the emerging area of transversity distributions. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2005
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39. Frontiers of polarized electron scattering experiments.

Author

Kox, Serge, Lhuillier, David, Maas, Frank, van de Wiele, Jacques, and Kumar, Krishna S.

Abstract

Parity-violating electron scattering has developed into a precise and sensitive tool to probe the structure of weak neutral current interactions at Q2 ≪ MZ2. Steady improvements in experimental techniques have made feasible asymmetry measurements with precision approaching 10 parts per billion and fractional accuracy of a few percent. In the future, upgrades of new facilities, new laboratories and further refinements of experimental techniques should allow us to explore new aspects of the strong and electroweak interactions. We describe some of these ideas in this article. [ABSTRACT FROM AUTHOR]

Published
2005
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42. Random sampling in flowshop scheduling

Author

Kumar, Krishna S

Subjects
Production scheduling -- Mathematical models, Production scheduling -- Data processing, Operations research, Monte Carlo method -- Computer programs, Stochastic processes -- Computer programs
Abstract

Not available

Published
1987

43. Measurement of the generalized polarizabilities of the proton in virtual Compton scattering at Q**2 = 0.92-GeV**2 and 1.76-GeV**2. 2. Dispersion relation analysis

Author

Laveissiere, G., Todor, L., Degrande, N., Jaminion, S., Jutier, C., Di Salvo, R., Hoorebeke, L., Alexa, L. C., Anderson, B. D., Aniol, K. A., Arundell, K., Audit, G., Auerbach, L., Baker, F. T., Baylac, M., Berthot, J., Bertin, P. Y., Bertozzi, W., Bimbot, L., Boeglin, W. U., Brash, E. J., Breton, V., Breuer, H., Burtin, E., Calarco, J. R., Cardman, L. S., Cavata, C., Chang, C. C., Chen, Jian-Ping, Chudakov, E., Cisbani, E., Dale, Daniel S., Jager, C. W., Leo, R., Deur, A., D Hose, N., Dodge, G. E., Domingo, J. J., Elouadrhiri, L., Epstein, M. B., Ewell, L. A., Finn, J. M., Fissum, K. G., Fonvieille, H., Fournier, G., Frois, B., Frullani, S., Furget, C., Gao, H., Gao, J., Garibaldi, F., Gasparian, A., Gilad, S., Gilman, Ronald A., Glamazdin, A., Glashausser, C., Gomez, J., Gorbenko, V., Grenier, P., Guichon, Pierre A. M., Hansen, J. O., Holmes, R., Holtrop, M., Howell, C., Huber, G. M., Hyde, Charles Earl, Incerti, S., Iodice, M., Jardillier, J., Jones, M. K., Kahl, W., Kato, S., Katramatou, A. T., Kelly, J. J., Kerhoas, S., Ketikyan, A., Khayat, M., Kino, K., Kox, S., Kramer, L. H., Kumar, Krishna S., Kumbartzki, G., Kuss, M., Leone, A., Lerose, J. J., Liang, M., Lindgren, R. A., Liyanage, N., Lolos, G. J., Lourie, R. W., Madey, R., Maeda, K., Malov, S., Manley, D. M., Marchand, C., Marchand, D., Margaziotis, D. J., Markowitz, P., Marroncle, J., Martino, J., Martoff, C. J., Mccormick, K., Mcintyre, J., Mehrabyan, S., Merchez, F., Meziani, Z. E., Michaels, R., Miller, G. W., Mougey, J. Y., Nanda, S. K., Neyret, D., Offermann, E. A. J. M., Papandreou, Z., Barbara Pasquini, Perdrisat, C. F., Perrino, R., Petratos, G. G., Platchkov, S., Pomatsalyuk, R., Prout, D. L., Punjabi, V. A., Pussieux, T., Quemener, G., Ransome, R. D., Ravel, O., Real, J. S., Renard, F., Roblin, Y., Rowntree, D., Rutledge, G., Rutt, P. M., Saha, A., Saito, T., Sarty, A. J., Serdarevic, A., Smith, T., Smirnov, G., Soldi, K., Sorokin, P., Souder, P. A., Suleiman, R., Templon, J. A., Terasawa, T., Tieulent, R., Tomasi-Gustaffson, E., Tsubota, H., Ueno, H., Ulmer, P. E., Urciuoli, G. M., Vanderhaeghen, M., Vyver, R., Meer, R. L. J., Vernin, P., Vlahovic, B., Voskanyan, H., Voutier, E., Watson, J. W., Weinstein, L. B., Wijesooriya, K., Wilson, R., Wojtsekhowski, B. B., Zainea, D. G., Zhang, W. M., Zhao, J., and Zhou, Z. L.

45. G**p(E) / G**p(M) for bound protons: first results for O-16 with the recoil polarization technique

Author

Malov, S., Wijesooriya, K., Baker, F. T., Bimbot, L., Brash, E. J., Chang, C. C., Finn, J. M., Fissum, K. G., Gao, J., Gilman, Ronald A., Glashausser, C., Jones, M. K., Kelly, J. J., Kumbartzki, G., Liyanage, N., Mcintyre, J., Nanda, S., Perdrisat, C. F., Punjabi, V. A., Quemener, G., Ransome, R. D., Rutt, P. M., Zainea, D. G., Anderson, B. D., Aniol, K. A., Auerbach, L., Berthot, J., Bertozzi, W., Bertin, P. Y., Boeglin, W. U., Breton, V., Breuer, H., Burtin, E., Calarco, J. R., Cardman, L., Cates, G. D., Cavata, C., Chen, Jian-Ping, Cisbani, E., Dale, Daniel S., Leo, R., Deur, A., Diederich, B., Djawotho, P., Domingo, J., Doyle, B., Ducret, J. E., Epstein, M. B., Ewell, L. A., Fleniken, J., Fonvieille, H., Frois, B., Frullani, S., Garibaldi, F., Gasparian, A., Gilad, S., Glamazdin, A., Gomez, J., Gorbenko, V., Gorringe, T., Griffioen, K., Hersman, F. W., Hines, J., Holmes, R., Holtrop, M., D Hose, N., Howell, C., Huber, G. M., Hyde, Charles Earl, Iodice, M., Jager, C. W., Jaminion, S., Joo, K., Jutier, C., Kahl, W., Kato, S., Kerhoas, S., Khandaker, M., Khayat, M., Kino, K., Korsch, W., Kramer, L., Kumar, Krishna S., Laveissiere, G., Leone, A., Le Rose, J. J., Levchuk, L., Liang, M., Lindgren, R. A., Lolos, G. J., Lourie, R. W., Madey, R., Maeda, K., Manley, D. M., Margaziotis, D. J., Pete Markowitz, Marroncle, J., Martino, J., Mccarthy, J. S., Mccormick, K., Meer, R. L. J., Meziani, Z. E., Michaels, R., Mougey, J., Neyret, D., Offermann, E. A. J. M., Papandreou, Z., Perrino, R., Petratos, G. G., Platchkov, S., Pomatsalyuk, R., Prout, D. L., Pussieux, T., Ravel, O., Roblin, Y., Roche, R., Rowntree, D., Rutledge, G. A., Saha, A., Saito, T., Sarty, A. J., Serdarevic-Offermann, A., Smith, T. P., Soldi, A., Sorokin, P., Souder, P., Suleiman, R., Templon, J. A., Terasawa, T., Todor, L., Tsubota, H., Ueno, H., Ulmer, P. E., Urciuoli, G. M., Vernin, P., Verst, S., Vlahovic, B., Voskanian, H., Watson, J. W., Weinstein, L. B., Wilson, R., Wojtsekhowski, B., Zeps, V., Zhao, J., and Zhou, Z. L.

46. Evaluation of presence of nasal deviation in patients presenting with obstructive sleep apnea using cone beam computed tomography.

Author

Ps I, Jose R, Shanmugham AM, Ramachandran A, Nair PK, Kumar KS, R BV, and Verghese RS

Abstract

Objective: Evaluation of the presence of nasal septal deviation in patients presenting with obstructive sleep apnea (OSA) using Cone-Beam Computed Tomography (CBCT)., Method: Patients diagnosed with OSA using polysomnography were further evaluated radiographically for the presence of nasal septal deviation, maxillary sinus septa, and oropharyngeal airway volume using CBCT., Results: Nasal deviation was present in all the patients and was classified according to Negus et al classification, further categorized with Apnea-hypopnea index (AHI) score, maxillary sinus septa in those patients were classified according to Al Faraj et al, and the oropharyngeal airway volume was found to be an average of 10,086.37 ± 3966.116 mm 2 airway volume., Conclusion: All the patients in the study had nasal septal deviation, hence it can be considered as a radiographic marker in suspecting OSA.

Published
2023
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47. Effect of deprogramming splint and occlusal equilibration on condylar position of TMD patients - A CBCT assessment.

Author

Ramachandran A, Jose R, Tunkiwala A, Varma R B, M Shanmugham A, Nair PK, Kumar KS, and Sam LM

Subjects
Humans, Occlusal Adjustment, Occlusal Splints, Splints, Spiral Cone-Beam Computed Tomography, Temporomandibular Joint Disorders diagnostic imaging, Temporomandibular Joint Disorders therapy
Abstract

Objective : Assessment of clinical symptoms and condylar position of TMD patients using CBCT imaging with deprogramming splint therapy and occlusal equilibration. The hypothesis tested was the alleviation of symptoms of TMD with possible changes in condylar position occurs with this treatment. Methods : The condylar position of 12 TMD patients was observed from CBCT images, and clinically, symptom severity score, mouth opening, and range of motion were compared pre- and post-treatment. Results : All patients reported a statistically significant decrease in the symptom severity score and increase in mouth opening and range of motion ( p < .05). A significant decrease was only achieved in the left anterior joint space ( p < .05). Conclusion : Deprogramming splint therapy and occlusal equilibration benefitted patients with a reduction in clinical symptoms, and minor changes in condylar position were observed.

Published
2021
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48. The mystery of phospholipid flip-flop in biogenic membranes.

Author

Gummadi SN and Kumar KS

Subjects
Animals, Bacteria metabolism, Biological Assay, Humans, Cell Membrane metabolism, Endoplasmic Reticulum metabolism, Phospholipids metabolism
Abstract

Phospholipid flip-flop is required for bilayer assembly and the maintenance of biogenic (self-synthesizing) membranes such as the eukaryotic endoplasmic reticulum and the bacterial cytoplasmic membrane. Due to the membrane topology of phospholipid biosynthesis, newly synthesized phospholipids are initially located in the cytoplasmic leaflet of biogenic membranes and must be translocated to the exoplasmic leaflet to give uniform bilayer growth. It is clear from many studies that phospholipid flip-flop in biogenic membranes occurs very rapidly, within a period of a few minutes. These studies also reveal that phospholipid translocation in biogenic membranes occurs bi-directionally, independently of the phospholipid head group, via a facilitated diffusion process in the absence of metabolic energy input, and that this type of transport requires specific membrane proteins. These translocators have been termed biogenic membrane flippases, and they differ from metabolic energy-dependent transporters (ABC transporters and MDR proteins). No biogenic membrane flippases have been characterized. This review briefly discusses the importance of biogenic membrane flippases, the various assay methods used for measuring the rate of phospholipid flip-flop, and the progress that has been made towards identifying these proteins.

Published
2005

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