Angular distributions in the dimuon hadronic production at 150 GeV/c

From π^- interactions at 150 GeV/c on a heavy target, we present the final analysis of the dimuon decay angular distribution in the mass interval 4.5–8.5 GeV/c². Results are presented and discussed in various reference frames and are also given in terms of the density matrix elements. Finally the possible contribution of higher-twist effects at largex ₁ is discussed; we find that our data are not compatible with higher twist contributions as proposed by the Berger and Brodsky Model.     

One‐ and two‐photon activity of cross‐conjugated photoinitiators with bathochromic shift

Intrigued by the good performance of 1,5‐diphenylpenta‐1,4‐diyn‐3‐one ( DPD ) as photoinitiator for radical polymerization we prepared and investigated several donor substituted derivatives. UV‐Vis spectroscopy revealed a gradual red‐shift of λ_max and higher extinction in the order of the donor capability. A methoxy‐substituted derivative ( O‐DPD ) exhibited significant photoinitiation activity in photo‐DSC experiments. Steady state photolysis experiments showed decreased decomposition rates with increasing donor capability. A dimethylamino derivative N‐DPD was even photostable under these conditions. Because of to the D‐π‐A‐π‐D system of these compounds two‐photon induced 3D photopolymerization experiments were performed and N‐DPD showed outstanding performance compared to often applied single photon initiators. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 3280–3291, 2007     

Frequency overshoot in quartz crystal oscillators during the warm-up time. Application to the BVA resonator

Summary An analysis of the overshoot phenomenon which is produced by quartz oscillators during the warm-up time is proposed. A particular application to oscillators equipped with ?electrodeless? resonators is described.

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Résumé Une analyse complète du phénomène de dépassement de fréquence présenté par les oscillateurs à quartz pendant leur période de démarrage est présentée. Une application particulière est faite pour les oscillateurs équipés de résonateurs à électrodes non adhérentes.

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Riassunto Si propone un'analisi del fenomeno di overshoot che è prodotto da oscillatori del quarzo durante il tempo di riscaldamento. Si descrive una particolare applicazione ad oscillatori equipaggiati con risonatori ?senza elettrodi?.

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Резюме Предлагается анализ явления перерегулировки, которое происходит в кварцевом осцилляторе во время разогрева. Обсуждается применение к осцилляторам, связанным с ?беээлектродными? резонаторами.

     

Polyfunctionalized hexahydro-1 (2H)-pentalenones by rearrangement of bicyclic 1,2-oxazine N-oxide derivatives

The title heterocycles rearrange into a mixture of diastereoisomeric hexahydro-1(2H)-pentalenone derivatives, which undergo nucleophilic eliminative ring fission by methanol to give 1-amino-2-nitroalkylated cyclopentancarboxylic esters. The X-ray structure determination of hexahydro-2-methyl-2-nitro-3-phenyl-6a- (1-piperidinyl) -1 (2H)-pentalenone – (2α, 3α, 3aα, 6aα) is also reported.     

Analysis of the absorption spectrum of 12CD4 between 2180 and 2320 cm−1. Comparative study of ν3 and 2ν3

The high-resolution spectrum of the ν₃ band of ¹²CD₄ has been recorded and analyzed. Corresponding to 367 allowed transitions of this band, 218 lines have been identified between 2180 and 2320 cm^?1. Twelve significant spectral constants have been determined in such a way as to reproduce the spectrum with a standard deviation equal to 7 × 10^?3 cm^?1.A comparative analysis between the present results on ν₃ and those obtained by K. Fox [J. Mol. Spectrosc.9, 381 (1962)] for 2ν₃ showed that the interaction between the two sub-levels E and F₂ of the v₃ = 2 state produces a significant effect of the second order and enabled us to determine the interval between these sublevels, i.e., 20 T₃₃ ～ 30 cm^?1.     

Nature of the chemical bond between metal atoms and oxide surfaces: new evidences from spin density studies of K atoms on alkaline earth oxides

We have studied the interaction of K atoms with the surface of polycrystalline alkaline-earth metal oxides (MgO, CaO, SrO) by means of CW- and Pulsed-EPR, UV-Vis-NIR spectroscopies and DFT cluster model calculations. The K adsorption site is proposed to be an anionic reverse corner formed at the intersection of two steps, where K binds by more than 1 eV, resulting in thermally stable species up to about 400 K. The bonding has small covalent and large polarization contributions, and the K atom remains neutral, with one unpaired electron in the valence shell. The interaction results in strong modifications of the K electronic wave function which are directly reflected by the hyperfine coupling constant, (K)a(iso). This is found to be a very efficient "probe" to measure the degree of metal-oxide interaction which directly depends on the substrate basicity. These results provide an original and general model of the early stages of the metal-support interaction in the case of ionic oxides.     

An extremal function for the Chang-Marshall inequality over the Beurling functions

S.-Y. A. Chang and D. E. Marshall showed that the functional is bounded on the unit ball of the space of analytic functions in the unit disk with and Dirichlet integral not exceeding one. Andreev and Matheson conjectured that the identity function is a global maximum on for the functional . We prove that attains its maximum at over a subset of determined by kernel functions, which provides a positive answer to a conjecture of Cima and Matheson.