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Search Results: 1 - 10 of 167564 matches for " E. Tsentalovich "
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High-Ampacity Power Cables of Tightly-Packed and Aligned Carbon Nanotubes
X. Wang,N. Behabtu,Colin C. Young,Dmitri E. Tsentalovich,M. Pasquali,J. Kono
Physics , 2014, DOI: 10.1002/adfm.201303865
Abstract: We characterize the current-carrying capacity (CCC), or ampacity, of highly-conductive, light, and strong carbon nanotube (CNT) fibers by measuring their failure current density (FCD) and continuous current rating (CCR) values. We show, both experimentally and theoretically, that the CCC of these fibers is determined by the balance between current-induced Joule heating and heat exchange with the surroundings. The measured FCD values of the fibers range from 10$^7$ to 10$^9$ A/m$^2$ and are generally higher than the previously reported values for aligned buckypapers, carbon fibers, and CNT fibers. To our knowledge, this is the first time the CCR for a CNT fiber has been reported. We demonstrate that the specific CCC (i.e., normalized by the linear mass density) of our CNT fibers are higher than those of copper.
SAMPLE: Parity Violating Electron Scattering from Hydrogen and Deuterium
E. J. Beise,J. Arrington,D. H. Beck,E. Candell,R. Carr,G. Dodson,K. Dow,F. Duncan,M. Farkhondeh,B. W. Filippone,T. FOrest,H. Gao,W. Korsch,S. Kowalski,A. Lung,R. D. McKeown,R. Mohring,B. A. Mueller,J. Napolitano,M. Pitt,N. Simicevic,E. Tsentalovich,S. Wells
Physics , 1996,
Abstract: Recently, there has been considerable theoretical interest in determining strange quark contributions to hadronic matrix elements. Such matrix elements can be accessed through the nucleon's neutral weak form factors as determined in parity violating electron scattering. The SAMPLE experiment will measure the strange magnetic form factor $G_M^s$ at low momentum transfer. By combining measurements from hydrogen and deuterium the theoretical uncertainties in the measurement can be greatly reduced and the result will be limited by experimental errors only. A summary of recent progress on the SAMPLE experiment is presented.
Measurement of the vector analyzing power in elastic electron-proton scattering as a probe of double photon exchange amplitudes
S. P. Wells,T. Averett,D. Barkhuff,D. H. Beck,E. J. Beise,C. Benson,H. Breuer,R. Carr,S. Covrig,J. DelCorso,G. Dodson,C. Eppstein,M. Farkhondeh,B. W. Filippone,T. Forest,P. Frasier,R. Hasty,T. M. Ito,C. Jones,W. Korsch,S. Kowalski,P. Lee,E. Maneva,K. McCarty,R. D. McKeown,J. Mikell,B. Mueller,P. Naik,M. L. Pitt,J. Ritter,V. Savu,D. T. Spayde,M. Sullivan,R. Tieulent,E. Tsentalovich,B. Yang,T. Zwart
Physics , 2000, DOI: 10.1103/PhysRevC.63.064001
Abstract: We report the first measurement of the vector analyzing power in inclusive transversely polarized elastic electron-proton scattering at Q^2 = 0.1 (GeV/c)^2 and large scattering angles. This quantity should vanish in the single virtual photon exchange, plane wave impulse approximation for this reaction, and can therefore provide information on double photon exchange amplitudes for electromagnetic interactions with hadronic systems. We find a non-zero value of A=-15.4+/-5.4 ppm. No calculations of this observable for nuclei other than spin 0 have been carried out in these kinematics, and the calculation using the spin orbit interaction from a charged point nucleus of spin 0 cannot describe these data.
Evaluation of the Antiradical Properties of Phenolic Acids
Olga Koroleva,Anna Torkova,Ilya Nikolaev,Ekaterina Khrameeva,Tatyana Fedorova,Mikhail Tsentalovich,Ryszard Amarowicz
International Journal of Molecular Sciences , 2014, DOI: 10.3390/ijms150916351
Abstract: Antioxidant capacity (AOC) against peroxyl radical and 2,2'-azino-bis-(3-ethylbenzothiazoline-6-sulphonic acid) diammonium salt (ABTS) radical cation was measured for a series of p-hydroxybenzoic (HB) and p-hydroxycinnamic (HC) acids at different pH. Quantum-chemical computation was performed using Gaussian 3.0 software package to calculate the geometry and energy parameters of the same compounds. Significant correlations were revealed between AOC and a number of calculated parameters. The most significant AOC descriptors for the studied compounds against peroxyl radical were found to be HOMO energy, rigidity (η) and Mulliken charge on the carbon atom in m-position to the phenolic hydroxyl. The most significant descriptor of the antioxidant properties against the ABTS radical cation at рН 7.40 is electron transfer enthalpy from the phenolate ion. The mechanism of AOC realization has been proposed for HB and HC acids against both radicals.
Measurements of the Generalized Electric and Magnetic Polarizabilities of the Proton at Low Q2 Using the VCS Reaction
P. Bourgeois,Y. Sato,J. Shaw,R. Alarcon,A. M. Bernstein,W. Bertozzi,T. Botto,J. Calarco,F. Casagrande,M. O. Distler,K. Dow,M. Farkondeh,S. Georgakopoulos,S. Gilad,R. Hicks,M. Holtrop,A. Hotta,X. Jiang,A. Karabarbounis,J. Kirkpatrick,S. Kowalski,R. Milner,R. Miskimen,I. Nakagawa,C. N. Papanicolas,A. J. Sarty,S. Sirca,E. Six,N. F. Sparveris,S. Stave,E. Stiliaris,T. Tamae,G. Tsentalovich,C. Tschalaer,W. Turchinetz,Z. -L. Zhou,T. Zwart
Physics , 2006, DOI: 10.1103/PhysRevLett.97.212001
Abstract: The mean square polarizability radii of the proton have been measured for the first time in a virtual Compton scattering experiment performed at the MIT-Bates out-of-plane scattering facility. Response functions and polarizabilities obtained from a dispersion analysis of the data at Q2=0.06 GeV2/c2 are in agreement with O(p3) heavy baryon chiral perturbation theory. The data support the dominance of mesonic effects in the polarizabilities, and the increase of beta with increasing Q2 is evidence for the cancellation of long-range diamagnetism by short-range paramagnetism from the pion cloud.
The Role of Mesons in the Electromagnetic Form Factors of the Nucleon
C. Crawford,T. Akdogan,R. Alarcon,W. Bertozzi,E. Booth,T. Botto,J. R. Calarco,B. Clasie,A. DeGrush,T. W. Donnelly,K. Dow,M. Farkhondeh,R. Fatemi,O. Filoti,W. Franklin,H. Gao,E. Geis,S. Gilad,D. Hasell,P. Karpius,M. Kohl,H. Kolster,T. Lee,E. Lomon,A. Maschinot,J. Matthews,K. McIlhany,N. Meitanis,R. Milner,J. Rapaport,R. Redwine,J. Seely,A. Shinozaki,A. Sindile,S. Sirca,E. Six,T. Smith,B. Tonguc,C. Tschalaer,E. Tsentalovich,W. Turchinetz,Y. Xiao,W. Xu,C. Zhang,Z. Zhou,V. Ziskin,T. Zwart
Physics , 2010, DOI: 10.1103/PhysRevC.82.045211
Abstract: The roles played by mesons in the electromagnetic form factors of the nucleon are explored using as a basis a model containing vector mesons with coupling to the continuum together with the asymptotic $Q^2$ behavior of perturbative QCD. Specifically, the vector dominance model (GKex) developed by Lomon is employed, as it is known to be very successful in representing the existing high-quality data published to date. An analysis is made of the experimental uncertainties present when the differences between the GKex model and the data are expanded in orthonormal basis functions. A main motivation for the present study is to provide insight into how the various ingredients in this model yield the measured behavior, including discussions of when dipole form factors are to be expected or not, of which mesons are the major contributors, for instance, at low-$Q^2$ or large distances, and of what effects are predicted from coupling to the continuum. Such insights are first discussed in momentum space, followed by an analysis of how different and potentially useful information emerges when both the experimental and theoretical electric form factors are Fourier transformed to coordinate space. While these Fourier transforms should not be interpreted as "charge distributions", nevertheless the roles played by the various mesons, especially which are dominant at large or small distance scales, can be explored via such experiment--theory comparisons.
The Charge Form Factor of the Neutron at Low Momentum Transfer from the $^{2}\vec{\rm H}(\vec{\rm e},{\rm e}'{\rm n}){\rm p}$ Reaction
E. Geis,V. Ziskin,T. Akdogan,H. Arenhoevel,R. Alarcon,W. Bertozzi,E. Booth,T. Botto,J. Calarco,B. Clasie,C. B. Crawford,A. DeGrush,T. W. Donnelly,K. Dow,M. Farkhondeh,R. Fatemi,O. Filoti,W. Franklin,H. Gao,S. Gilad,D. Hasell,P. Karpius,M. Kohl,H. Kolster,T. Lee,A. Maschinot,J. Matthews,K. McIlhany,N. Meitanis,R. G. Milner,J. Rapaport,R. P. Redwine,J. Seely,A. Shinozaki,S. Sirca,A. Sindile,E. Six,T. Smith,M. Steadman,B. Tonguc,C. Tschalaer,E. Tsentalovich,W. Turchinetz,Y. Xiao,W. Xu,C. Zhang,Z. Zhou,T. Zwart
Physics , 2008, DOI: 10.1103/PhysRevLett.101.042501
Abstract: We report new measurements of the neutron charge form factor at low momentum transfer using quasielastic electrodisintegration of the deuteron. Longitudinally polarized electrons at an energy of 850 MeV were scattered from an isotopically pure, highly polarized deuterium gas target. The scattered electrons and coincident neutrons were measured by the Bates Large Acceptance Spectrometer Toroid (BLAST) detector. The neutron form factor ratio $G^{n}_{E}/G^{n}_{M}$ was extracted from the beam-target vector asymmetry $A_{ed}^{V}$ at four-momentum transfers $Q^{2}=0.14$, 0.20, 0.29 and 0.42 (GeV/c)$^{2}$.
Measurement of the proton electric to magnetic form factor ratio from \vec ^1H(\vec e, e'p)
C. B. Crawford,A. Sindile,T. Akdogan,R. Alarcon,W. Bertozzi,E. Booth,T. Botto,J. Calarco,B. Clasie,A. DeGrush,T. W. Donnelly,K. Dow,D. Dutta,M. Farkhondeh,R. Fatemi,O. Filoti,W. Franklin,H. Gao,E. Geis,S. Gilad,W. Haeberli,D. Hasell,W. Hersman,M. Holtrop,P. Karpius,M. Kohl,H. Kolster,T. Lee,A. Maschinot,J. Matthews,K. McIlhany,N. Meitanis,R. G. Milner,J. Rapaport,R. P. Redwine,J. Seely,A. Shinozaki,S. Sirca,E. Six,T. Smith,B. Tonguc,C. Tschalaer,E. Tsentalovich,W. Turchinetz,J. F. J. van den Brand,J. van der Laan,F. Wang,T. Wise,Y. Xiao,W. Xu,C. Zhang,Z. Zhou,V. Ziskin,T. Zwart
Physics , 2006, DOI: 10.1103/PhysRevLett.98.052301
Abstract: We report the first precision measurement of the proton electric to magnetic form factor ratio from spin-dependent elastic scattering of longitudinally polarized electrons from a polarized hydrogen internal gas target. The measurement was performed at the MIT-Bates South Hall Ring over a range of four-momentum transfer squared $Q^2$ from 0.15 to 0.65 (GeV/c)$^2$. Significantly improved results on the proton electric and magnetic form factors are obtained in combination with previous cross-section data on elastic electron-proton scattering in the same $Q^2$ region.
The Qweak Experiment: A Search for New Physics at the TeV Scale via a Measurement of the Proton's Weak Charge
R. D. Carlini,J. M. Finn,S. Kowalski,S. A. Page,D. S. Armstrong,A. Asaturyan,T. Averett,J. Benesch,J. Birchall,P. Bosted,A. Bruell,C. L. Capuano,G. Cates,C. Carrigee,S. Chattopadhyay,S. Covrig,C. A. Davis,K. Dow,J. Dunne,D. Dutta,R. Ent,J. Erler,W. Falk,H. Fenker,T. A. Forest,W. Franklin,D. Gaskell,M. Gericke,J. Grames,K. Grimm,F. W. Hersman,D. Higinbotham,M. Holtrop,J. R. Hoskins,K. Johnston,E. Ihloff,M. Jones,R. Jones,K. Joo,J. Kelsey,C. Keppel,M. Khol,P. King,E. Korkmaz,J. Leacock,J. P. Leckey,L. Lee,A. Lung,D. Mack,S. Majewski,J. Mammei,J. Martin,D. Meekins,A. Micherdzinska,A. Mkrtchyan,H. Mkrtchyan,N. Morgan,K. E. Myers,A. Narayan,A. K. Opper,J. Pan,K. Paschke,M. Pitt,M. Poelker,Y. Prok,W. D. Ramsay,M. Ramsey-Musolf,J. Roche,N. Simicevic,G. Smith,T. Smith,P. Souder,D. Spayde,B. E. Stokes,R. Suleiman,V. Tadevosyan,E. Tsentalovich,W. T. H. van Oers,W. Vulcan,P. Wang,S. Wells,S. A. Wood,S. Yang,R. Young,H. Zhu,C. Zorn
Physics , 2012,
Abstract: We propose a new precision measurement of parity-violating electron scattering on the proton at very low Q^2 and forward angles to challenge predictions of the Standard Model and search for new physics. A unique opportunity exists to carry out the first precision measurement of the proton's weak charge, $Q_W =1 - 4\sin^2\theta_W$. A 2200 hour measurement of the parity violating asymmetry in elastic ep scattering at Q^2=0.03 (GeV/c)^2 employing 180 $\mu$A of 85% polarized beam on a 35 cm liquid Hydrogen target will determine the proton's weak charge with approximately 4% combined statistical and systematic errors. The Standard Model makes a firm prediction of $Q_W$, based on the running of the weak mixing angle from the Z0 pole down to low energies, corresponding to a 10 sigma effect in this experiment.
Cluster Model of Formation of Subnuclear and Subatomic Objects  [PDF]
E. E. Lin
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.53018
Abstract:

The paper describes the development results on one-dimensional (1D) asymptotic model of the formation kinetics for the objects (clusters) of subnuclear (quark) and subatomic (nuclear) matters. A concept of the objects distribution density wave φ(a, t) in space of sizes a lies in the basis for analytical description of the processes under consideration. The proposed formalism makes it possible to describe in an adequate way the final outcomes of the well-known catastrophic phenomena in the world of elementary particles. Mass characteristics of different processes of approach to equilibrium in nuclear reactions are calculated.

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