Top Quark Production Cross Section

The production rate for top quarks at the Fermilab Tevatron is presented using the exact order $\alpha_s^3$ corrected cross section and the resummation of the leading soft gluon corrections in all orders of perturbation theory.Comment: preprint FERMILAB-Pub-93/270-T, ITP-SB-93-55, THU-93/23, Latex 9 pages, 8 postscript figures, uuencoded and appended at end of fil

The Contribution of Domestic and International Conflict In Renaissance Italy to the Sport of Fencing

Fencing, the art or practice of attack and defense with the foil, épée, or saber, has progressed over hundreds of years from the warfare of Germanic tribes to a regulated Olympic sport. This paper investigates the development of fencing during the fifteenth and sixteenth century Italian Renaissance and outlines a variety of ways that fencing culture mirrored Italy’s at the time, demonstrating that Italian fencing was a product of both international and domestic conflict beyond the sport itself. The competitive cultural influence of aesthetic epicenters such as the Florentine Republic over other European countries—particularly France, Spain, and Italy—was paralleled by the spread of Italian fencing treatises and masters into these nations. Furthermore, an internal Italian culture that prioritized honor and fostered rivalry among citizens, as well as their city-states, made the fencing duel a tenant of Italian society as a means of defending one’s dignity. Preparation for these duels, and their increasing regulation, led to the practice of fencing as a sport. Taken in tandem, these factors meant the Italian style was in an optimal position of burgeoning progress and societal tension to be the inspiration for all fencing that followed

A comparison of the vocabularies of the grade one and two books of the Learning to read series and ten standardized reading tests

Thesis (M.A.)--Boston University, 1948. This item was digitized by the Internet Archive

J/psi Production via Fragmentation at the Tevatron

The production of \jpsi at large transverse momenta (\pt > M_\jpsi) in $p\bar p$ collisions is considered by including the mechanism of fragmentation. Both contributions of fragmentation to \jpsi and of fragmentation to $\chi$ states followed by radiative decay to \jpsi are taken into account. The latter is found to be dominant and larger than direct production. The overall theoretical estimate is shown to be nearly consistent with the experimental observation.Comment: LaTeX, 7 pages. Preprint FNT/T-94/13, LNF-94/024(P). Data taken from a reference were incorrect and have been changed. Complete postscript file available via anonymous ftp at cobra1.pv.infn.it, as pub/jpsi.ps(.Z)(.gz

Measuring the Effectiveness of Isolation of Brassica napus L. Accessions During Caged Germplasm Regeneration

Gene flow, which is the successful movement of genes among populations by mating or migration of seeds or other propagules, has gained much interest in agriculture in recent years because of the widescale adoption of transgenic crops and concerns over transgene escape into the wild (James 2004; Messeguer 2003; Stewart et al. 2003). Brassica napus (rapeseed), together with maize and sugar beet, have been identified among the species for which cross-pollination and transgene escape are concerns (Treu and Emberlin 2000)

A Positive-Weight Next-to-Leading-Order Monte Carlo for Z Pair Hadroproduction

We present a first application of a previously published method for the computation of QCD processes that is accurate at next-to-leading order, and that can be interfaced consistently to standard shower Monte Carlo programs. We have considered Z pair production in hadron-hadron collisions, a process whose complexity is sufficient to test the general applicability of the method. We have interfaced our result to the HERWIG and PYTHIA shower Monte Carlo programs. Previous work on next-to-leading order corrections in a shower Monte Carlo (the MC@NLO program) may involve the generation of events with negative weights, that are avoided with the present method. We have compared our results with those obtained with MC@NLO, and found remarkable consistency. Our method can also be used as a standalone, alternative implementation of QCD corrections, with the advantage of positivity, improved convergence, and next-to-leading logarithmic accuracy in the region of small transverse momentum of the radiated parton.Comment: 33 pages, 10 figure

Production of q bar-q Pairs in Proton-Nucleus Collisions at High Energies

We calculate production of quark-antiquark pairs in high energy proton-nucleus collisions both in the quasi-classical approximation of McLerran-Venugopalan model and including quantum small-$x$ evolution. The resulting production cross section is explicitly expressed in terms of Glauber-Mueller multiple rescatterings in the classical case and in terms of dipole-nucleus scattering amplitude in the quantum evolution case. We generalize the result of one of us (K.T.) beyond the aligned jet configurations. We expand on the earlier results of Blaizot, Gelis and Venugopalan by deriving quark production cross section including quantum evolution corrections in rapidity intervals both between the quarks and the target and between the quarks and the projectile.Comment: 18 pages, 3 figures; typos corrected, discussion extende

Next-to-next-to-leading soft-gluon corrections for the top quark cross section and transverse momentum distribution

I present results for top quark production in hadronic collisions at LHC and Tevatron energies. The soft-gluon corrections to the differential cross section are resummed at next-to-next-to-leading-logarithm (NNLL) accuracy via the two-loop soft anomalous dimension matrices. Approximate next-to-next-to-leading-order (NNLO) differential and total cross sections are calculated. Detailed theoretical predictions are shown for the t tbar cross section and the top quark p_T distribution at the Tevatron and the LHC.Comment: 23 pages, 14 figures; additional results and figure

Mental Health Advocacy: Building an Interdisciplinary Program for Agriculture Professionals

The suicide rate among agriculturalists is 3.5 times higher than the general population. A number of external factors related to the farming and veterinary work put individuals in agricultural populations at risk for poor mental health outcomes, including economic variables (e.g. tariffs, market prices), environmental factors affecting yield (e.g. drought, pests), and exposure to difficult or traumatic life events (e.g., mistreatment of animals, loss of crop). Rural values including self-reliance, work orientation, and individualism combined with logistical and systemic barriers to competent behavioral health care further increase risk. Project GROW (Generating Resilience in Our Workforce) is a multifaceted full semester program designed to train agriculture students in how to be mental health advocates in order to address the mental health and suicide crisis among farmers in the state of Texas

Computational and experimental investigation of mixing in microchannels

This paper was presented at the 2nd Micro and Nano Flows Conference (MNF2009), which was held at Brunel University, West London, UK. The conference was organised by Brunel University and supported by the Institution of Mechanical Engineers, IPEM, the Italian Union of Thermofluid dynamics, the Process Intensification Network, HEXAG - the Heat Exchange Action Group and the Institute of Mathematics and its Applications.Mixing is a key process for the successful of all chemical or biochemical reactions, so effective micromixers represent essential components for micro total analysis systems (μTAS) or lab-on-a-chip. In the present study a combined computational and experimental approach was adopted to evaluate how the efficiency of a Y-mixer can be enhanced by modifying its downstream geometry. Three different geometries were studied and compared: Y-straight channel, Y-sine channel and Y-wrinkled wall channel. For each of them the influence of perfusing flow rates and channel cross section aspect ratio was investigated. Physical prototypes were built using a simple technique based on a xerographic process, and their mixing performance was experimentally evaluated. Computational models of the designed micromixers were generated: the Navier-Stokes equations for an incompressible Newtonian fluid and the advection-diffusion equation were solved with an uncoupled approach by means of the finite volume method. The computational and experimental results were critically compared, revealing Y-wrinkled wall mixer as the best performer among those considered and suggesting criteria of possible improvements and optimization