Total cross sections of π, K, p and on protons and deuterons between 200 and 370 GeV/c

Total cross sections of π^±, K^±, p and on protons and deuterons have been measured at 6 momenta between 200 and 370 GeV/c.     

Addendum

Accurate valence band dispersions E$\text{k}$ of LaB₆ have been determined along three main symmetry lines ΓM, ΓX, and XM using one single crystal (001) surface by a simple new photoemission technique of general utility. Using direct interband transitions, E$\text{k}$dispersions are mapped out by suitably scanning polar emission angle and the photon energy. Detailed results agree well with recent Xα-APW energy band calculations.     

Temperaturkoeffizient der Polyäthylen-Ketten-Konfiguration aus Messungen der Intrinsieviskosität

Ohne Zusammenfassung     

Improved measurement of the K+-->pi+nunu; branching ratio

An additional event near the upper kinematic limit for K+-->pi(+)nunu; has been observed by experiment E949 at Brookhaven National Laboratory. Combining previously reported and new data, the branching ratio is B(K+-->pi(+)nunu;)=(1.47(+1.30)(-0.89))x10(-10) based on three events observed in the pion momentum region 211相似文献   

Flavor decomposition of the sea-quark helicity distributions in the nucleon from semiinclusive deep inelastic scattering

Double-spin asymmetries of semiinclusive cross sections for the production of identified pions and kaons have been measured in deep inelastic scattering of polarized positrons on a polarized deuterium target. Five helicity distributions including those for three sea quark flavors were extracted from these data together with reanalyzed previous data for identified pions from a hydrogen target. These distributions are consistent with zero for all three sea flavors. A recently predicted flavor asymmetry in the polarization of the light quark sea appears to be disfavored by the data.     

The use of the MNDO SCF MO method in UPS band-assignments for unsaturated hydrocarbons and fluorocarbons

The MNDO SCF MO method developed by Dewar and co-workers has been tested in regard to its ability to provide UPS band-assignments for a series of unsaturated hydrocarbons and fluorocarbons. The method performs admirably in this endeavour and generally predicts the same orbital-ordering scheme as that predicted by rigorous ab initio computational procedures. The possible use of the method in studying the “perfluoro effect” has been addressed as well. The method is clearly not as reliable for hexafluoro-(Dewar)benzene as for the other fluorocarbons. The MNDO predictions of the band assignments for the syn and anti dimers of cyclobutadiene serve to muddle further an already lively, but muddled, controversy.     

Bioactive pyranoxanthones from the roots of Calophyllum blancoi

Phytochemical investigation of the roots of Calophyllum blancoi growing in Taiwan resulted in the isolation of three new pyranoxanthones, blancoxanthone (1), acetyl blancoxanthone (2) and 3-hydroxyblancoxanthone (3), in addition to two known pyranoxanthones, pyranojacaeubin (4) and caloxanthone (5). Structural characterization of the isolated compounds was determined by spectral analyses especially 2-D NMR. Biological study of the isolated xanthones revealed that blancoxanthone (1) exhibited significant anti-coronavirus activity.     

Ketonization of the remarkably strongly acidic elongated enol generated by flash photolytic decarboxylation of p-benzoylphenylacetic acid in aqueous solution

Photodecarboxylation of p-benzoylphenylacetic acid in aqueous solution produces the elongated enol 5, whose strength as an oxygen acid (pQ(E/a)= 7.67) makes it more acidic than simple enol analogs by several orders of magnitude.     

Semicontinuous Mappings into T.V.S. with Applications to Mixed Vector Variational-Like Inequalities

Let (X, Z) be the space of continuous linear mappings between topological vector spaces, where Z is Hausdorff and preordered by a closed convex cone C. In this paper, we introduce a notion of semicontinuity to any function from a topological space into X. A notion of semicontinuity is also introduced to any function from a topological space into (X, Z). These two notions of semicontinuity are related by the embedding of X into (X, Z). Their basic properties are given. As an application, we derive some existence results for the mixed vector variational-like inequality. This work was partially supported by grants from the National Science Council of the Republic of China.