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91.
The influence of near-surface technological stresses on the photoacoustic images of Vickers pyramid indentations in silicon
nitride ceramics is studied experimentally. It is found that grinding- and polishing-induced stresses in the ceramics influence
the behavior of photoacoustic signals coming from the ends of surface cracks. Photoacoustic microscopy data obtained from
Vickers-indented areas near the ends of cracks make it possible to estimate technological stresses. 相似文献
92.
Alavi-Harati A Alexopoulos T Arenton M Arisaka K Averitte S Barbosa RF Barker AR Barrio M Bellantoni L Bellavance A Belz J Ben-David R Bergman DR Blucher E Bock GJ Bown C Bright S Cheu E Childress S Coleman R Corcoran MD Corti G Cox B Crisler MB Erwin AR Ford R Glazov A Golossanov A Graham G Graham J Hagan K Halkiadakis E Hamm J Hanagaki K Hidaka S Hsiung YB Jejer V Jensen DA Kessler R Kobrak HG LaDue J Lath A Ledovskoy A McBride PL Mikelsons P Monnier E Nakaya T Nelson KS Nguyen H O'Dell V 《Physical review letters》2002,88(18):181601
We present a measurement of the charge asymmetry delta(L) in the mode K(L)-->pi(+/-)e(-/+)nu based on 298 x 10(6) analyzed decays. We measure a value of delta(L) = [3322+/-58(stat)+/-47(syst)]x10(-6), in good agreement with previous measurements and 2.4 times more precise than the current best published result. The result is used to place more stringent limits on CPT and DeltaS = DeltaQ violation in the neutral kaon system. 相似文献
93.
Alavi-Harati A Albuquerque IF Alexopoulos T Arenton M Arisaka K Averitte S Barker AR Bellantoni L Bellavance A Belz J Ben-David R Bergman DR Blucher E Bock GJ Bown C Bright S Cheu E Childress S Coleman R Corcoran MD Corti G Cox B Crisler MB Erwin AR Ford R Fordyce PM Glazov A Golossanov A Graham G Graham J Hagan K Halkiadakis E Hanagaki K Hidaka S Hsiung YB Jejer V Jennings J Jensen DA Kessler R Kobrak HG LaDue J Lath A Ledovskoy A McBride PL McManus AP Mikelsons P Monnier E Nakaya T Nelson KS 《Physical review letters》2001,86(3):397-401
We report on a search for the decay KL-->pi(0)e+e- carried out by the KTeV/E799 experiment at Fermilab. This decay is expected to have a significant CP violating contribution and the measurement of its branching ratio could support the Cabibbo-Kobayashi-Maskawa mechanism for CP violation or could point to new physics. Two events were observed in the 1997 data with an expected background of 1.06+/-0.41 events, and we set an upper limit B(KL-->pi(0)e+e-)<5.1 x 10(-10) at the 90% confidence level. 相似文献
94.
Alavi-Harati A Alexopoulos T Arenton M Arisaka K Averitte S Barker AR Bellantoni L Bellavance A Belz J Ben-David R Bergman DR Blucher E Bock GJ Bown C Bright S Cheu E Childress S Coleman R Corcoran MD Corti G Cox B Crisler MB Erwin AR Ford R Glazov A Golossanov A Graham G Graham J Hagan K Halkiadakis E Hamm J Hanagaki K Hidaka S Hsiung YB Jejer V Jensen DA Kessler R Kobrak HG LaDue J Lath A Ledovskoy A McBride PL Mikelsons P Monnier E Nakaya T Nelson KS Nguyen H O'Dell V Pang M Pordes R 《Physical review letters》2001,86(5):761-764
We have performed studies of the K(0)(L)-->pi(+)pi(-)gamma direct emission ( DE) and inner Bremsstrahlung ( IB) vertices, based on data collected by KTeV during the 1996 Fermilab fixed target run. We find a(1)/a(2) = -0.737+/-0.034 GeV2 for the DE form-factor parameter in the rho-propagator parametrization, and report on fits of the form factor to linear and quadratic functions as well. We concurrently measure gamma(K(0)(L)-->pi(+)pi(-)gamma,E(*)(gamma)>20 MeV)/gamma(K(0)(L)-->pi(+)pi(-)) = (20.8+/-0.3)x10(-3), and a K(0)(L)-->pi(+)pi(-)gamma DE/(DE+IB) branching ratio of 0.683+/-0.011. 相似文献
95.
Alavi-Harati A Alexopoulos T Arenton M Arisaka K Averitte S Barbosa RF Barker AR Barrio M Bellantoni L Bellavance A Belz J Ben-David R Bergman DR Blucher E Bock GJ Bown C Bright S Cheu E Childress S Coleman R Corcoran MD Corti G Cox B Crisler MB Erwin AR Ford R Glazov A Golossanov A Graham G Graham J Hagan K Halkiadakis E Hamm J Hanagaki K Hidaka S Hsiung YB Jejer V Jensen DA Kessler R Kobrak HG LaDue J Lath A Ledovskoy A McBride PL Mikelsons P Monnier E Nakaya T Nelson KS Nguyen H O'Dell V 《Physical review letters》2001,87(13):132001
We present the first measurement of the form factor ratios g(1)/f(1) (direct axial vector to vector), g(2)/f(1) (second class current), and f(2)/f(1) (weak magnetism) for the decay Xi(0)-->Sigma(+)e(-)nu macro(e) using the KTeV (E799) beam line and detector at Fermilab. From the Sigma(+) polarization measured with the decay Sigma(+)-->p pi(0) and the e(-)-nu; correlation, we measure g(1)/f(1) to be 1.32+/-(0.21)(0.17)(stat)+/-0.05(syst), assuming the SU(3)(f) (flavor) values for g(2)/f(1) and f(2)/f(1). Our results are all consistent with exact SU(3)(f) symmetry. 相似文献
96.
Alavi-Harati A Alexopoulos T Arenton M Arisaka K Averitte S Barbosa RF Barker AR Barrio M Bellantoni L Bellavance A Belz J Ben-David R Bergman DR Blucher E Bock GJ Bown C Bright S Cheu E Childress S Coleman R Corcoran MD Corti G Cox B Crisler MB Erwin AR Ford R Glazov A Golossanov A Graham G Graham J Hagan K Halkiadakis E Hamm J Hanagaki K Hidaka S Hsiung YB Jejer V Jensen DA Kessler R Kobrak HG LaDue J Lath A Ledovskoy A McBride PL Mikelsons P Monnier E Nakaya T Nelson KS Nguyen H O'Dell V 《Physical review letters》2001,87(11):111802
We have collected a 43 event sample of the decay K(L)-->e(+)e(-)mu(+)mu(-) with negligible backgrounds and measured its branching ratio to be (2.62+/-0.40+/-0.17)x10(-9). We see no evidence for CP violation in this decay. In addition, we set the 90% confidence upper limit on the combined branching ratios for the lepton flavor violating decays K(L)-->e(+/-)e(+/-)mu(-/+)mu(-/+) at B(K(L)-->e(+/-)e(+/-)mu(-/+)mu(-/+))< or =1.23x10(-10), assuming a uniform phase space distribution. 相似文献
97.
Alavi-Harati A Alexopoulos T Arenton M Arisaka K Averitte S Barbosa RF Barker AR Barrio M Bellantoni L Bellavance A Belz J Bergman DR Blucher E Bock GJ Bown C Bright S Cheu E Childress S Coleman R Corcoran MD Corti G Cox B Cunha A Erwin AR Ford R Glazov A Golossanov A Graham G Graham J Halkiadakis E Hamm J Hanagaki K Hidaka S Hsiung YB Jejer V Jensen DA Kessler R Kobrak HG LaDue J Lath A Ledovskoy A McBride PL Medvigy D Mikelsons P Monnier E Nakaya T Nelson KS Nguyen H O'Dell V Pordes R 《Physical review letters》2002,89(7):072001
We use K(L)'s in the 100-200 GeV energy range to produce 147 candidate events of the axial vector pair K1(1270)-K1(1400) in the nuclear Coulomb field of a Pb target and determine the radiative widths Gamma(K1(1400)-->K0+gamma)=280.8+/-23.2(stat)+/-40.4(syst) keV and Gamma(K1(1270)-->K0+gamma)=73.2+/-6.1(stat)+/-28.3(syst) keV. These first measurements appear to be lower than the quark-model predictions. We also place upper limits on the radiative widths for K(*)(1410) and K(*)(2)(1430) and find that the latter is vanishingly small in accord with SU(3) invariance in the naive quark model. 相似文献
98.
S. V. Glazov V. M. Kislov E. A. Salgansky 《Russian Journal of Applied Chemistry》2018,91(10):1581-1587
Theoretical and experimental dependences of the combustion front propagation velocity in a layer of a solid carbon fuel on various external factors and conditions were examined in the case of filtration of the gaseous oxidizing agent. Particular attention was given to the superadiabatic modes with heat accumulation. It was shown that, in the case of a superadiabatic filtration combustion mode, the combustion velocity is primarily determined by the supply rate of the oxidizing agent and by the stoichiometric process ratio for particular conditions. 相似文献
99.
The partial pressures of sodium nitrite and potassium nitrate over melts of the binary system NaNO2-KNO3 were measured at 798, 823, and 848 K. Negative deviations of the vapor pressure from Raoult's law, which decrease with increasing temperature, are established. Coefficients A and B of the Clausius-Clapeyron equation, partial molar heats of vaporization, activity and activity coefficient are calculated as functions of composition for potassium nitrate. 相似文献
100.
V. I. Glazov G. P. Dukhanin M. Kh. Dkhaibe V. A. Losev 《Russian Journal of Applied Chemistry》2004,77(10):1733-1735
The activities and activity coefficients of the components of the system NaNO2-NaNO3, obtained from experimental saturated vapor pressures measured at 798, 823, and 848 K, were used to calculate the total and excess partial molar Gibbs energies
,
, entropies
,
, and total relative and excess thermodynamic properties G, G
ex, S, S
ex of the system.Translated from Zhurnal Prikladnoi Khimii, Vol. 77, No. 10, 2004, pp. 1747–1749.Original Russian Text Copyright © 2004 by Glazov, Dukhanin, Dkhaibe, Losev. 相似文献