Disruptive Events during the High School Years and Educational Attainment

We use data from the National Education Longitudinal Survey to examine the effects of family structure and school changing on attendance during high school and educational continuation through college entry. We find that both family structure and changing schools are associated with more attendance problems during high school and with school continuation decisions after high school. The results also show that family structure, changing schools, and attendance patterns play important roles in shaping the educational attainment of individuals, including their postsecondary educational experiences.

Cyclotron resonance propulsion system semiannual report no. 1

Cyclotron resonance plasma accelerator for space propulsion application

Investigation of plasma accelerator /cyclotron resonance propulsion system/ Final report

Electron cyclotron resonance plasma accelerators for space propulsion system

Measurements of αs\alpha_s from event shapes and the four-jet rate

New results from measurements of the strong coupling constant $\alpha_s(M_Z)$ at LEP are presented. In particular, a new LEP combination of results based on event-shape variables has become available, where a new method for the estimation of the theoretical uncertainty has been implemented. Furthermore, two other analyses are quoted, based on power corrections and the four-jet rate.Comment: Talk presented at the 31st International Conference on High Energy Physics, Amsterdam, 24-31 July 200

Techniques for QCD calculations by numerical integration

Calculations of observables in quantum chromodynamics are typically performed using a method that combines numerical integrations over the momenta of final state particles with analytical integrations over the momenta of virtual particles. I describe the most important steps of a method for performing all of the integrations numerically.Comment: 36 pages with 16 postscript figure

Quark-Gluon Jet Differences at LEP

A new method to identify the gluon jet in 3-jet ``{\bf Y}'' decays of $Z^0$ is presented. The method is based on differences in particle multiplicity between quark jets and gluon jets, and is more effective than tagging by leptonic decay. An experimental test of the method and its application to a study of the ``string effect'' are proposed. Various jet-finding schemes for 3-jet events are compared.Comment: 11 pages, LaTeX, 4 PostScript figures availble from the author ([email protected]), MSUTH-92-0

A numerical approach to the double real radiation part of e+e- to 3 jets at NNLO

We report on the sector decomposition approach to the double real radiation part of e^+e^- to 3 jets at NNLO.Comment: 5 pages, 4 figures, talk given at the conference "Loops and Legs in Quantum Field Theory", Eisenach, Germany, April 200

Successive Combination Jet Algorithm For Hadron Collisions

Jet finding algorithms, as they are used in $e^+ e^-$ and hadron collisions, are reviewed and compared. It is suggested that a successive combination style algorithm, similar to that used in $e^+ e^-$ physics, might be useful also in hadron collisions, where cone style algorithms have been used previously.Comment: 18 pages plus four uuencoded postscript figures, REVTEX 3.0, CERN-TH.6860/9