Unifying the Fixed Order Evolution of Fragmentation Functions with the Modified Leading Logarithm Approximation

An approach which unifies the Double Logarithmic Approximation at small x and the leading order DGLAP evolution of fragmentation functions at large x is presented. This approach reproduces exactly the Modified Leading Logarithm Approximation, but is more complete due to the degrees of freedom given to the quark sector and the inclusion of the fixed order terms. We find that data from the largest x values to the peak region can be better fitted than with other approaches

Racial issues in White dyads: An investigation of Helms\u27s interaction model

Experienced counselors in three eastern states were surveyed about the incidence of racial issues presented by their White clients and were asked to complete the White Racial Identity Attitudes Scales (WRIAS) and to respond to a questionnaire about a White client presenting a racial issue. Nearly a quarter of the counselors responding to the survey reported having some clients raising racial issues as main issues in counseling, and 45% reported having some clients bringing up racial issues relevant to their counseling. Respondents generally did not have training to help White clients with racial issues, nor did many report having special strategies, information, or interventions they used in such situations. Counselors\u27 patterns of response on the WRIAS were found to be related to their patterns of response on the Case Questionnaire, and the predictions of Helms\u27s interaction model were partially supported

Variational objective analyses for cyclone studies

The basic analysis equations, i.e., the two horizontal momentum equations, the hydrostatic equation, and the integrated continuity equation were derived for the nonlinear vertical coordinate, nondimensionalized, and expressed in finite differences on a staggered grid. Special care was taken to transform the hydrostatic equation and the pressure gradient terms of the horizontal momentum equations to nearly eliminate truncation error over steeply sloping terrain. This formulation also eliminated explicit reference to orographically induced variations in the thermodynamic variables so that the variational adjustments are on the scale of the meteorological perturbations. The analysis equations were subjected to the Euler-Lagrange operations as expressed for finite differences and an additional set of five partial differential equations was derived, bringing to nine the number of equations in Model I. Higher order terms, terms containing observed quantities, and terms containing none of the variables to be adjusted were grouped into forcing functions and the equations were solved for the zero order terms. Zero order variables were eliminated between these equations and there resulted two diagnostic equations which take the form of general linear second order partial differential equations with nonconstant coefficients

A proposal for the coherent propagation studies portion of the 10.6-micrometer laser communications experiment Advanced Technology Satellite-F technical proposal

Coherent propagation study proposal for ATS-F 10.6 micrometer laser communications experimen

Fünfter Beitrag zur Kenntnis der Taumelkäfer des Amazonas-Gebiets (Col., Gyrinidae)

I)ie Bearbeitung eines umlangreichen Taumelkäfermaterials (Gyrinidae, Col') aus Zentralamazonien uncl Zentralbrasilien (Coll. prrrrau), von der Serra da Neblina (coll. LTNDE,MANN), vom Amazonas (coll. ANro¡¡to Dos sANTos)' vom solimões, IJmg. b.,.rg von Belém-Pará und dem brasilianischen Grenzgebiet nach- Suriname (Coll' 3o"t"io¡ erbrachte 20 neue Arten uncl 6 neue Ijnterarten. Damit hat sich die ZahI cler aus dem Amazonasgebiet bekannten Gyriniden a:Uif 74 Arten und 13 ljnterarten erhöht. Bs zeigt sich, dai zwischen der Gyriniclen-Fauna des nördlichen und südlichen Randgebiete, "A*uáni.ns kein wesentlicher lJnterschied, z. T. sogar Artgleichheit besteht. Ein deutlicher Faunenwechsel tritt erst in Zentralbrasilien, im Raum von Brasília, ein, wo sich die Wasserscheicle der Flußsysteme Tocantins, São Francisco und Paraná befìndet

Criticality, Fractality and Intermittency in Strong Interactions

Assuming a second-order phase transition for the hadronization process, we attempt to associate intermittency patterns in high-energy hadronic collisions to fractal structures in configuration space and corresponding intermittency indices to the isothermal critical exponent at the transition temperature. In this approach, the most general multidimensional intermittency pattern, associated to a second-order phase transition of the strongly interacting system, is determined, and its relevance to present and future experiments is discussed.Comment: 15 pages + 2 figures (available on request), CERN-TH.6990/93, UA/NPPS-5-9

Can the gamma-gamma processes reveal the nature of the sigma ?

We reanalyse the gamma-gamma scattering data and conclude that in the mass region below 1 GeV the cross section for gamma-gamma to pi^0-pi^0 can be largely explained by the one pion exchange process with pi-pi rescattering. The radiative width of the sigma is estimated and a model dependent separation into contributions from direct gamma-gamma decay and decay through rescattering is obtained. We confront these findings with QCD spectral sum rule (QSSR) predictions and conclude that the sigma can have a large gluonium component in its wave function

Parton-Hadron duality in event generators

The validity of local parton-hadron duality within the framework of HERWIG and JETSET event generators is investigated. We concentrate on ${\rm e}^{+}{\rm e}^{-}$ annihilations in LEP 2 energy range as these interactions provide theoretically the cleanest condition for the discussion of this concept.Comment: PRA-HEP-92/14, 10 pages and 7 PS figures obtainable upon request, LATEX. email transmission errors corrected. Requests for figures can be sent on the above ID or to CHYLA@CSPGAS1