Do Deep Inelastic Scattering Data Favor a Light Gluino

A next--to--leading order QCD analysis of deep inelastic scattering data is performed allowing for contributions due to a light gluino. We obtain the values of $\alpha_s(M_Z^2) \pm \delta \alpha_s^{stat} = 0.108 \pm 0.002, 0.124 \pm 0.001, 0.145 \pm 0.009$ for QCD, SUSY QCD with a Majorana gluino and a Dirac gluino respectively. The value of \alsm obtained in SUSY QCD with a Majorana gluino best agrees with the direct measurements of $\alpha_s(M_Z^2)$ at LEP.Comment: 8 pages with 7 pages of figures, DESY 94-00

Multivariate Fitting and the Error Matrix in Global Analysis of Data

When a large body of data from diverse experiments is analyzed using a theoretical model with many parameters, the standard error matrix method and the general tools for evaluating errors may become inadequate. We present an iterative method that significantly improves the reliability of the error matrix calculation. To obtain even better estimates of the uncertainties on predictions of physical observables, we also present a Lagrange multiplier method that explores the entire parameter space and avoids the linear approximations assumed in conventional error propagation calculations. These methods are illustrated by an example from the global analysis of parton distribution functions.Comment: 13 pages, 5 figures, Latex; minor clarifications, fortran program made available; Normalization of Hessian matrix changed to HEP standar

CTEQ Parton Distributions and Flavor Dependence of Sea Quarks

This paper describes salient features of new sets of parton distributions obtained by the CTEQ Collaboration based on a comprehensive QCD global analysis of all available data. The accuracy of the new data on deep inelastic scattering structure functions obtained by the very high statistics NMC and CCFR experiments provides unprecedented sensitivity to the flavor dependence of the sea-quark distributions. In addition to much better determination of the small x dependence of all parton distributions, we found: (i) the strange quark distribution is much softer than the non-strange sea quarks and rises above the latter at small-x; and (ii) the difference $\bar d-\bar u$ changes sign as a function of x. A few alternative sets of viable distributions with conventional assumptions are also discussed.Comment: 13 pages with figures, MSUHEP-92-27, Fermilab-Pub-92/371, FSU-HEP-92-1225, ISU-NP-92-1

Self-Perceptions of Iowa Public School Superintendents toward Occupational Stress

xi, 226 leaves. Advisor: Barry SteimThe problem. The purpose of this study was to determine (1) the frequency and intensity of occupational sources of stress as perceived by Iowa public school superintendents, (2) the relationship between perceived occupational sources of stress and demographic variables, and (3) stress management techniques used by superintendents. Procedure. The modified Administrative Stress Index was mailed on October 14, 1985, to forty randomly selected Iowa public school superintendents who represented four school district enrollment categories. Respondents identified the frequency and intensity of thirty-five stressors on two separate five-point Likert-type scales and provided pertinent demographic information. Data were analyzed using the Statistical Package for the Social Sciences. Conclusion. Results from the study show a difference in the total mean intensity of stressors among age groups of superintendents. There was no difference in the mean frequency of stressors among age groups. There was no difference in the mean frequency or the mean intensity of stressors by five categorical stress factors, superintendency roles, college degree levels, district sizes, district descriptors, number of years in the present position, total number of years in administration, number of hours worked per week, number of hours of physical exercise per week, and the level of physical health. Of the twenty-three hypotheses in the study, all were accepted at the .05 level of significance with the exception of one. Recommendations. Research might determine the duration of the stressors, correlation between stress and additional demographic variables, and contributing factors related to high stress levels among school superintendents

Constitutivism

A brief explanation and overview of constitutivism

Measurement of Dijet Angular Distributions and Search for Quark Compositeness

We have measured the dijet angular distribution in $\sqrt{s}$=1.8 TeV $p\bar{p}$ collisions using the D0 detector. Order $\alpha^{3}_{s}$ QCD predictions are in good agreement with the data. At 95% confidence the data exclude models of quark compositeness in which the contact interaction scale is below 2 TeV.Comment: 11 pages, Latex, 3 postscript figure

Nuclear Shadowing in Electro-Weak Interactions

Shadowing is a quantum phenomenon leading to a non-additivity of electroweak cross sections on nucleons bound in a nucleus. It occurs due to destructive interference of amplitudes on different nucleons. Although the current experimental evidence for shadowing is dominated by charged-lepton nucleus scattering, studies of neutrino nucleus scattering have recently begun and revealed unexpected results.Comment: 77 pages, 57 figures. To be published in "Progress in Particle and Nuclear Physics" 201

MAJOR 1.5 - A Monte Carlo Generator for Heavy Majorana Neutrinos in epep Collisions

The Monte Carlo generator {\sc Major} 1.5 simulates the production and decay of heavy Majorana neutrinos via lepton mixing or exchange of `light' right-handed $W$-bosons in deep inelastic scattering, i.e. $e^{\pm} p \rightarrow {N} X \rightarrow{e}^{\pm} W^{\mp} X$ or $\nu_e Z X$. Physics and programming aspects are described in this manual.Comment: 13 pages LaTeX, 2 PostScript figure

The twilight of the Liberal Social Contract? On the Reception of Rawlsian Political Liberalism

This chapter discusses the Rawlsian project of public reason, or public justification-based 'political' liberalism, and its reception. After a brief philosophical rather than philological reconstruction of the project, the chapter revolves around a distinction between idealist and realist responses to it. Focusing on political liberalism’s critical reception illuminates an overarching question: was Rawls’s revival of a contractualist approach to liberal legitimacy a fruitful move for liberalism and/or the social contract tradition? The last section contains a largely negative answer to that question. Nonetheless the chapter's conclusion shows that the research programme of political liberalism provided and continues to provide illuminating insights into the limitations of liberal contractualism, especially under conditions of persistent and radical diversity. The programme is, however, less receptive to challenges to do with the relative decline of the power of modern states

La ciencia de la evaluación del riesgo ecosistémico al servicio de la restauración de ecosistemas : una guía para la aplicación de la Lista Roja de Ecosistemas a la restauración

Las recientes iniciativas mundiales de restauración de ecosistemas ofrecen una oportunidad sin precedentes para mejorar la conservación de la biodiversidad y la salud y el bienestar humanos. de la biodiversidad. Proporcionan a los seres humanos múltiples beneficios: un clima estable y un aire respirable; agua, alimentos y materiales; y protección contra desastres y enfermedades. La restauración de ecosistemas, tal como la define el Decenio de las Naciones Unidas para la Restauración de los Ecosistemas, incluye una variedad de intervenciones de gestión que tienen como objetivo reducir los impactos y ayudar en la recuperación de ecosistemas que hayan sido dañados, degradados o destruidos. Esta guía se desarrolló para promover la aplicación de la ciencia de la evaluación de los riesgos ecosistémicos, que implica medir el riesgo de colapso de los ecosistemas, en el ámbito de la restauración. Explora cómo la Lista Roja de Ecosistemas de la UICN y la restauración de ecosistemas pueden implementarse conjuntamente para reducir el riesgo de colapso de los ecosistemas