Analytical QCD and multiparticle production

We review the perturbative approach to multiparticle production in hard collision processes. It is investigated to what extent parton level analytical calculations at low momentum cut-off can reproduce experimental data on the hadronic final state. Systematic results are available for various observables with the next-to-leading logarithmic accuracy (the so-called modified leading logarithmic approximation - MLLA). We introduce the analytical formalism and then discuss recent applications concerning multiplicities, inclusive spectra, correlations and angular flows in multi-jet events. In various cases the perturbative picture is surprisingly successful, even for very soft particle production.Comment: 97 pages, LaTeX, 22 figures, uses sprocl.sty (included

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

What effects do nurse residency programs have on the transition of newly licensed nurses into the practice environment during the first year of practice?

Purpose: The purpose of this review is to compare current research on nurse residency programs and determine to what degree they assist the positive transition of new graduate nurses during the first year of practice. Design: An integrative literature review was conducted of research studies on nurse residency programs in acute care settings. Kramer\u27s Reality Shock Theory guided this review. Methods: Research published in the U.S. between 2007-2013, was obtained from electronic data searches using the key works new graduate nurses , novice nurse , reality shock , and nurse residency programs. Outcomes were compared and synthesized into major themes. Findings: Major themes include an increase in competency, satisfaction, peer support, confidence, commitment to the profession, and retention of nurses who completed yearlong residency programs. Organizational cost savings was also found. Conclusions/Relevance: The findings support previous research recommendations that the ideal length of nurse residency programs is one year; and the essential program components include preceptors or mentors and didactic education. This study findings show advance evidence of the important effects that nurse residency programs have on new graduate nurses\u27 transition into practice, including a reduction in reality shock

A New Monetary Policy Shock with Text Analysis

Measures of monetary shocks commonly give rise to the puzzling result where a monetary tightening has an expansionary effect. A possible reason is that agents may believe that monetary shocks contain information regarding the central bank’s assessment of the economic environment (Nakamura and Steinsson, 2018). Under this hypothesis, the estimated response to monetary policy shocks would contain two conflating effects: the actual effect of monetary policy and the reaction of private agents to the newly acquired information. This paper overcomes this problem by extracting a novel series of monetary shocks using text analysis methods on central bank documents. The resulting text-based variables contain the informational content from changes in the policy rate. Thus, they can be used to extract exogenous changes in monetary policy that are orthogonal to any central bank information. Using this information-free measure of monetary policy shocks reveals that a monetary tightening is not expansionary, even when estimated on more recent periods

The Use of Noncontingent Reinforcement in the Regular Education Classroom with Attention-Deficit Hyperactivity Disorder Children

A problem that exists in many regular education classrooms is excessive disruptive behavior of students. This study will examine the disruptive behavior of two children, age 8, who have been diagnosed with Attention-Deficit Hyperactivity Disorder, in a simulated regular education classroom. Due to a renewed emphasis on linking treatment to functional analysis, noncontingent reinforcement was utilized to determine whether teacher mediated or peer mediated attention can decrease the disruptive behavior. This study used a multi-element design for the functional analysis and a reversal (ABAB) design to evaluate the effects of the noncontingent reinforcement treatment. Results indicated that peer attention was the variable that maintained the disruptive behavior of both children and suggested that noncontingent reinforcement was a partially effective treatment since levels of disruptive behavior decreased during the initial treatment phase, but could not be replicated for the final treatment phase

Development of a sterilizable ruggedized vidicon for lunar and planetary photography Interim technical report, 21 May 1965 - 21 Aug. 1966

Sterilizable ruggedized vidicon for lunar and planetary photograph

Development of a sterilizable ruggedized vidicon for lunar and planetary photography Final report, 21 May 1965 - 21 Nov. 1967

Sterilizable ruggedized vidicon for lunar and planetary photograph

Perturbative QCD Approach to Multiparticle Production

In this review we discuss the analytical perturbative approach, based on perturbative QCD and Local Parton Hadron Duality (LPHD), and its application to multiparticle production in jets in the semisoft region. Analytical formulae are presented for various observables within the accuracy of the Modified Leading Logarithmic Approximation (MLLA), i.e. with terms of relative order $\sqrt{\alpha_s}$ taken into account systematically, and in some cases with even higher accuracy. These predictions are confronted with existing experimental data. Many details of the perturbative approach to multiple hadroproduction have been consolidated in recent years, and the overall picture is remarkably healthy. The prospects of future studies of the semisoft jet physics are also discussed.Comment: LaTex, 153 pages, 54 figures available from the authors; to be publ. by Int. Journal of Modern Physics