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121.
K. Brodsky F. Perales J. B. Lawson-Daku R. Mathevet J. Baudon J. Robert 《International Journal of Theoretical Physics》1999,38(1):259-276
We discuss experimental results on Stern-Gerlachinterferometry with atoms. After a theoretical approachsuited for fast atoms, we discuss elementary experimentson the preservation of atomic coherence. Then we examine the action of theinterferometer as producing atoms with new properties,beaded atoms, and their radiative properties. 相似文献
122.
The true potential energy curves forX
1
Σ
+, a3
π
r,A
1
π,e
3
Σ
−,E
1
Σ
+,c
3
π
i states of astrophysically important molecule SiO, whose spectra were observed in the sunspots, have been constructed using
the method of Lakshman and Rao. Dissociation energy and ionization potential have been estimated as 65,350 cm−1 and 92,854 cm−1 respectively and found to be in good agreement with the values cited in literature.
The true potential energy curves forX
1
Σ
+,D
1
π andE
1
Σ
+ states of SiS molecule have been constructed by the same method and its dissociation energy in the ground state has been
estimated using Hulburt-Hirschfelder potential function as 54,765 cm−1 in good agreement with 53,250.9 cm−1 given by Herzberg. 相似文献
123.
We consider a model for gloun jet fragmentation based on QCD in which the fast hadrons in the jet are produced by the sequential reaction gluon hadrons. The resulting jet shows an oblate transverse momentum structure, with a major axis preferential oriented normally to the direction of linear polarization of the gluon. We discuss jet-jet oblateness angular correlations in decays of heavy QQ? pseudoscalar and vector systems. 相似文献
124.
We apply to nucleon decay the knowledge about the short-distance structure of baryon wave functions gleaned from QCD form factor calculations nd the decay rate. We review the uncertainties arising when current algebra and PCAC are used to relate meson decay rates to 〈0|qqq|N〉 matrix elements. We show that the relevant matrix elements are not directly related to those of the leading twist operators “measured” in conventional high momentum transfer physics, but argue for an indirect based on models that fit both form factor and decay data. We use these inputs to calculate the p → e+π0 decay rate in minimal SU(5) and other grand unified theories (GUTs) for a specified value of the heavy vector boson mass mX. Our results combined with the recent experimental lower limit on this mode indicate that mX > 2 × 1015 GeV in the minimal SU(5) GUT, and we derive analogous bounds for supersymmetric GUTs. Our calculated lifetime for a given value of mX is considerably shorter than previous estimates made using non-relativistic SU(6) or the bag model, a difference traceable to the different normalizations of 2 and 3 quark wave functions at short distances. 相似文献
125.
Robert J. Linhardt S. Falkow S. L. Moseley D. Gillespie I. Brodsky J. Bresser J. R. Kiovsky C. L. Hendrick S. Lavi P. Leder R. Maas R. A. Owens T. O. Diener D. F. Rippe H. Rubin D. A. Shafritz G. M. Wahl G. R. Stark R. A. Weinberg C. J. Tobin S. M. Bradley L. B. Wilson J. T. Wilson R. F. Geever 《Applied biochemistry and biotechnology》1986,12(3):301-310
126.
The effect of microscopic surface roughness on the opical characteristics of metal is considered. The field near the rough surface has been calculated on the basis of integral equations containing only smoothly varying field components. It appears that the influence of surface plasmons can cause, as a result of drastic enhancement of the field at the surface, an increase by several orders in such observed surface effects as photoemission and Raman scattering by adsorbed molecules. The results of calculation are compared with the experimental data obtained from the study of photoemission from silver with rough surface. Expressions have been derived for the dispersion relation for surface plasmons on a rough surface. 相似文献
127.
128.
129.
Solid bisphenol-A epoxy
resin of medium molecular mass was cured using a Lewis acid initiator (ytterbium(III)
trifluoromethanesulfonate) in three different proportions (0.5, 1 and 2 phr).
A kinetic study was performed in a differential scanning calorimeter. The
complete kinetic triplet was determined (activation energy, pre-exponential
factor, and integral function of the degree of conversion) for each system.
A kinetic analysis was performed with an integral isoconversional procedure
(free model), and the kinetic model was determined both with the Coats-Redfern
method (the obtained isoconversional value being accepted as the effective
activation energy) and through the compensation effect. All the systems followed
the same isothermal curing model simulated from non-isothermal ones. The growth-of-nuclei
Avrami kinetic model A3/2 has been proposed as the
polymerization kinetic model. The addition of initiator accelerated the reaction
especially when 2 phr was added. 0.5 and 1 phr showed very few kinetic differences
between them. 相似文献
130.
S. M. Brodsky V. P. Varvaritsa S. V. Mamikonyan V. I. Filatov 《Journal of Radioanalytical and Nuclear Chemistry》1984,83(1):155-159
An X-ray spectrometric system including210Po -particle sources for excitation and a Si(Li) detector has been applied to determine the concentrations of trace elements in water samples. Thin targets were prepared by the evaporation of a known volume of water deposited on a Mylar backing. The system was calibrated using the internal standard method. Relative sensitivities were measured for 16 elements detected by their K, L and M X-rays. The results are compared with theoretical calculations. The minimum detection limits from 0.01 to 0.07 g/ml were obtained for 2000 s analysis time. 相似文献