Solution autoxidation of EPDM and termonomers

Oxygen uptake of 3 low molecular weight ethylene-propylene terpolymers (EPDM) and their respective bicyclic diolefin termonomers (dicyclopentadiene, ethylidene norbornene and methyl endomethylene hexahydronaphthalene) has been measured at ? 70°.     

Analysis of the μSR of carbontetrachloride: As a liquid in various transverse magnetic fields with added scavengers,and as crystalline solids

Carbontetrachloride has been widely used in liquid phase μ SR as a calibrant of the asymmetry in view of its supposed 100% diamagnetic muon yield. However, in the present letter, evidences are presented to show that this conventional use of CCl₄ might be wrong and that there exists thermalized muonium in it that partially leads to a lost polarization.     

Direct and modulated reflectance spectra of MnO,CoO, and NiO

Direct reflectance, thermoreflectance, and electroreflectance have been measured for MnO, CoO, and NiO above the fundamental edge. Spectra of all three materials support a model containing both localized and one-electron band states. In MnO peaks with temperature coefficients of ～ 10^?3 eV/K were observed at 5.7 and 6.9 eV, temperature-independent structure occurred at 5.4, 6.3, and 7.2 eV, and spectral features with indeterminate temperature dependence were seen at 4.6 and 5.5 eV. The temperature-dependent structure was assigned to one-electron interband transitions associated with anion 2p and cation 4s states; the temperature independent structure was assigned to crystal field split localized interionic transitions between the 3d-states of neighboring Mn ions. Thermoreflectance spectra for CoO exhibited temperature dependent structure (9.5 × × 10^?4 eV/K at 5.0, 6.0, and 7.2 eV. A strong, temperature dependent electroreflectance oscillation was seen in NiO near 6.2 eV. On the basis of these data the interband gap between the anion 2p and cation 4s bands was determined to be 5.7 eV in MnO, 6.0 eV in CoO, and 6.2 eV in NiO.     

Two particle correlations in the central region of pp and π−p interactions at 100–300 GeV/c

Significant positive correlations are seen for all charge combinations of pion pairs with small rapidity separation. Joint rapidity-azimuthal correlations show that this positive correlation occurs when like (unlike) pions are produced with small (large) separation in azimuth.     

Estimation of the mean power content of summed sinusoids and an application to acoustic noise measurement in shallow water

Measurements of physical quantities such as pressure or velocity commonly display significant variations in both space and time. The variation in a single spatial or temporal co-ordinate may often be described by the sum of a finite number of sinusoids of differing wavenumber or frequency, whichever is appropriate. The power average of a small number of random samples is presented as a suitable estimate of the mean power content of such a sum of sinusoids of evenly distributed random argument. Confidence levels which apply to these estimates have been derived by a direct Monte Carlo simulation for three separate cases in which the sinusoids are assumed to have constant equal amplitudes, constant amplitudes which are sample values of an evenly distributed random variable, or constant amplitudes which are sample values of a Gaussian distributed random variable of zero mean and unit variance. The confidence levels, which are unbiased, have a maximum standard error of 0·003. Independent checks on the accuracy of the data have been provided by numerical integration in a few special cases. Use of the confidence levels is illustrated by their application to measurements of acoustic source noise taken in shallow water by the appropriate use of vertical arrays of randomly spaced transducers.     

Semi-Topological K-Homology and Thomason''s Theorem

In this paper, we introduce the 'semi-topological K-homology' of complex varieties, a theory related to semi-topological K-theory much as connective topological K-homology is related to connective topological K-theory. Our main theorem is that the semi-topological K-homology of a smooth, quasi-projective complex variety Y coincides with the connective topological K-homology of the associated analytic space Y ^an. From this result, we deduce a pair of results relating semi-topological K-theory with connective topological K-theory. In particular, we prove that the 'Bott inverted' semi-topological K-theory of a smooth, projective complex variety X coincides with the topological K-theory of X ^an. In combination with a result of Friedlander and the author, this gives a new proof, in the special case of smooth, projective complex varieties, of Thomason's celebrated theorem that 'Bott inverted' algebraic K-theory with /n coefficients coincides with topological K-theory with /n coefficients.     

Detection of cis-trans isomers of a synthetic peptide fragment of erythropoietin

The synthesis of the protected fragment t-butoxycarbonyl-alanine-isoleucine-serine(benzyl)-proline (Pro)-Pro-OH derived from the hormone erythropoietin is described. The analysis of the peptide by high-pressure liquid chromatography (HPLC) and thin-layer chromatography (TLC) yields apparently inconsistent results. Although HPLC consistently indicates the presence of only one component, TLC reveals a number of distinct species. Because satisfactory amino acid analysis and fast atom bombardment-mass spectrometry results are obtained, we think it possible that the distinct components arise from the cis-trans isomerization of the peptide bonds to the prolyl residues. An analysis using capillary electrophoresis under basic conditions identifies four components in the final product. Also, under similar conditions proton nuclear magnetic resonance spectroscopy is able to confirm the presence of cis and trans isomers. The results from this study demonstrate the usefulness of each of the four techniques in identifying the isomerism of the standard amino acid-Pro bond with respect to the peptide's ionic state.     

Adsorption of carbon monoxide on Ni(110) above atmospheric pressure investigated with surface X-ray diffraction

The crystallographic structure of CO adsorbed on Ni(110) has been investigated with x-ray diffraction at ambient pressures of CO ranging from 2.3 to 10(-10) bars. At room temperature, the high pressure and vacuum structures are identical. Above room temperature ( approximately 130 degrees C), the high pressure of CO induces a restructuring of the Ni substrate that develops strained (111) microfacets.