An analysis of one possible method of determining the energy of a laser pulse that has traversed a test path is given. Based on a model of phase screens and the Monte-Carlo method of statistical ...tests, the conditions of propagation of laser pulses in air are modeled and geometric parameters of the measurement system which are optimal from the point of view of error minimization are determined.PUBLICATION ABSTRACT
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CEKLJ, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
We propose a new class of nonlinear evolution equations, satisfying the homogeneity condition, for pure and mixed quantum states. These equations are generalizations of the nonlinear Schrödinger ...equation, recently proposed by Doebner and Goldin for the wave function written in positional coordinates. The new model is applied to investigate the relaxation processes in systems with equidistant spectra (spin and harmonic oscillator), both in discrete and continuous representations.
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IJS, IMTLJ, KILJ, KISLJ, NUK, SBCE, SBJE, UL, UM, UPCLJ, UPUK
493.
A search for excited fermions at HERA Adloff et al, C.
European physical journal. C, Particles and fields,
12/2000, Volume:
17, Issue:
4
Journal Article
Peer reviewed
Open access
A search for excited fermions f\(^*\) of the first generation in \(e^+p\) scattering at the collider HERA is presented using H1 data with an integrated luminosity of 37 pb\(^{-1}\). All electroweak ...decays of excited fermions, f\(^* \rightarrow\)f\(\gamma,\)fW,fZ are considered and all possible final states resulting from the Z orW hadronic decays or decays into leptons of the first two generations are taken into account. No evidence for f\(^*\) production is found. Mass dependent exclusion limits on cross-sections and on the ratio of coupling constants to the compositeness scale are derived.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NUK, OBVAL, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The kinetics of tryptic digestion of melittin was studied by combined electrospray ionization time-of-flight mass spectrometry and high-performance liquid chromatography. The ratios of the kinetic ...constants for cleavage of the peptide bonds that are susceptible to trypsin action were determined. It is shown that trypsin does not manifest affinity for the hydrolysis of the peptide bonds inside the Arg,Lys cluster series as efficiently as it cleaves the peptide at the separately localized Lys residue. This feature demonstrates clearly the advantage of the kinetic approach to tryptic mapping of proteins. The kinetic approach allows the determination of not only discrete structural segments in protein structure but also their relative locations and their amino acid sequences. Using the melittin digests and some artificially prepared amino acids and dipeptides mixtures as models, it is shown that the presence and nature of basic amino acids predetermines the charge states of the molecules analyzed by electrospray but not the yields of their ions. The aliphatic parts of the molecules seem to be more important in determining the actual ion yields.
We study the peculiarities of the nonstationary Casimir effect (creation of photons in cavities with moving boundaries) in the special case of two resonantly coupled modes with frequencies ...\(\omega_0\) and \((3\Delta)\omega_0\), parametrically excited due to small amplitude oscillations of the ideal cavity wall at the frequency \(2\omega_0(1\delta)\) (with \(|\delta|,|\Delta|\ll 1\)). The effects of thermally induced oscillations in time dependences of the mean numbers of created photons and the exchange of quantum purities between the modes are discovered. Squeezing and photon distributions in each modes are calculated for initial vacuum and thermal states. A possibility of compensation of detunings is shown.
The production of neutral strange hadrons is investigated using deep-inelastic scattering events measured with the H1 detector at HERA. The measurements are made in the phase space defined by the ...negative four-momentum transfer squared of the photon 2<Q super(2)<100 GeV super(2) and the inelasticity 0.1<y<0.6. The K sub(s ) super(0) and $\varLambda(\bar{\varLambda})$ production cross sections and their ratios are determined. K sub(s ) super(0) production is compared to the production of charged particles in the same region of phase space. The - $\bar{\varLambda}$ asymmetry is also measured and found to be consistent with zero. Predictions of leading order Monte Carlo programs are compared to the data.
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FZAB, GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, UL, UM, UPUK, VKSCE, ZAGLJ
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