Hadron Mass Extraction from Lattice QCD

The extraction of quantities from lattice QCD calculations at realistic quark masses is of considerable importance. Whilst physical quark masses are some way off, the recent advances in the calculation of hadron masses within full QCD now invite improved extrapolation methods. We show that, provided the correct chiral behaviour of QCD is respected in the extrapolation to realistic quark masses, one can indeed obtain a fairly reliable determination of masses, the sigma commutator and the J parameter. We summarise these findings by presenting the nonanalytic behaviour of nucleon and rho masses in the standard Edinburgh plot.Comment: Talk presented by S. V. Wright at the Workshop on Lattice Hadron Physics (LHP2001), Cairns, Australia, 9-18 July 2001, 8 pages, requires espcrc2.sty (included

Exploratory studies of the cruise performance of upper surface blown configuration: Experimental program, high-speed force tests

The work to develop a wing-nacelle arrangement to accommodate a wide range of upper surface blown configuration is reported. Pertinent model and installation details are described. Data of the effects of a wide range of nozzle geometric variations are presented. Nozzle aspect ratio, boattail angle, and chordwise position are among the parameters investigated. Straight and swept wing configurations were tested across a range of nozzle pressure ratios, lift coefficients, and Mach numbers

Exploratory studies of the cruise performance of upper surface blown configurations: Experimental program, high-speed pressure tests

Basic pressure data are presented which was obtained from an experimental study of upper-surface blown configurations at cruise. The high-speed (subsonic) experimental work, studying the aerodynamic effects of wing-nacelle geometric variations, was conducted around semi-span model configurations composed of diversified, interchangeable components. Power simulation was provided by high-pressure air ducted through closed forebody nacelles. Nozzle geometry was varied across size, exit aspect ratio, exit position and boattail angle. Both 3-D force and 2-D pressure measurements were obtained at cruise Mach numbers from 0.5 to 0.8 and at nozzle pressure ratios up to about 3.0. The experimental investigation was supported by an analytical synthesis of the system using a vortex lattice representation with first-order power effects. Results are also presented from a compatibility study in which a short-haul transport is designed on the basis of the aerodynamic findings in the experimental study as well as acoustical data obtained in a concurrent program. High-lift test data are used to substantiate the projected performance of the selected transport design

Exploratory studies of the cruise performance of upper surface blown configurations. Experimental program: Test facilities, model design instrumentation, and lowspeed, high-lift tests

The model hardware, test facilities and instrumentation utilized in an experimental study of upper surface blown configurations at cruise is described. The high speed (subsonic) experimental work, studying the aerodynamic effects of wing nacelle geometric variations, was conducted around semispan model configurations composed of diversified, interchangeable components. Power simulation was provided by high pressure air ducted through closed forebody nacelles. Nozzle geometry was varied across size, exit aspect ratio, exit position and boattail angle. Three dimensional force and two dimensional pressure measurements were obtained at cruise Mach numbers from 0.5 to 0.8 and at nozzle pressure ratios up to about 3.0. The experimental investigation was supported by an analytical synthesis of the system using a vortex lattice representation with first order power effects. Results are also presented from a compatibility study in which a short haul transport is designed on the basis of the aerodynamic findings in the experimental study as well as acoustical data obtained in a concurrent program. High lift test data are used to substantiate the projected performance of the selected transport design

From the Associate Editors of Education/Minority and International Business

From the editors of the Spring 2010 Special Section—Entrepreneurial Education, Minority and International Business

First-year impact of an Early Reading First project on language and early reading skill development

This study is of a federally-funded Early Reading First project aimed at improving school readiness by creating Centers of Excellence which focus on language and early reading skills development of low-income preschool children. The project consisted of a content standards-based curriculum and instructional program, literacy enriched classrooms, ongoing professional development, and parent involvement. The analysis focuses on 65 randomly assigned preschoolers attending state preschools (treatment = 37 and control = 28), enrolled for at least 18 weeks, who would be eligible by birth date for entry into public kindergarten the following year. Results demonstrate the intervention to be effective in improving the receptive language and early reading skills of participating preschoolers

A model realisation of the Jaffe-Wilczek correlation for pentaquarks

We discuss a realisation of the pentaquark structure proposed by Jaffe and Wilczek within a simple quark model with colour-spin contact interactions and coloured harmonic confinement, which accurately describes the $\Delta-N$ splitting. In this model spatially compact diquarks are formed in the pentaquark but no such compact object exists in the nucleon. The colour-spin attraction brings the Jaffe-Wilczek-like state down to a low mass, compatible with the experimental observation and below that of the naive ground state with all $S$-waves. We find, however, that although these trends are maintained, the extreme effects observed do not survive the required ``smearing'' of the delta function contact interaction. We also demonstrate the weakness of the ``schematic'' approximation when applied to a system containing a $P$-wave. An estimate of the anti-charmed pentaquark mass is made which is in line with the Jaffe-Wilczek prediction and significantly less than the value reported by the H1 collaboration.Comment: 10 pages, uses psfra

Exploratory studies of the cruise performance of upper surface blown configurations

The data and major conclusions obtained from an experimental/analytical study of upper-surface blown (USB) configurations at cruise are summarized. The high-speed (subsonic) experimental work, studying the aerodynamic effects of wing-nacelle geometric variations, was conducted around semi-span model configurations composed of diversified, interchangeable components. Power simulation was provided by high pressure air ducted through closed forebody nacelles. Nozzle geometry was varied across size, exit aspect ratio, exit position and boattail angle. Both 3-D force and 2-D pressure measurements were obtained at cruise Mach numbers from 0.5 to 0.8 and at nozzle pressure ratios up to about 3.0. The experimental investigation was supported by an analytical synthesis of the system using a vortex lattice representation with first-order power effects. Results are also presented from a compatibility study in which a short-haul transport is designed on the basis of the aerodynamic findings in the experimental study as well as acoustical data obtained in a concurrent program. High-lift test data are used to substantiate the projected performance of the selected transport design

Evaluation of a Flipped Classroom in Mechanics of Materials

Recent interest towards the implementation of flipped (or inverted) classroom models parallelsthe wide availability of technology and the shift from lecture-based teaching methods towardsstudent-centered teaching methods in undergraduate engineering education. The flippedclassroom involves two components, computer-based video instruction outside of the classroomand interactive learning activities inside the classroom. The intent is to create an active andengaging classroom experience that can be tailored to meet the needs of students possessing awide range of learning styles. This can potentially reduce attrition, improve knowledge retention,and enhance skill development in engineering.The goals of this study are to compare and contrast the effectiveness of a flipped classroom and atraditional lecture-based classroom in a first course in mechanics of materials. Two 5-weeksummer session courses in mechanics of materials were used to perform the study. The firstcourse was taught in a traditional lecture-based format where, during face-to-face meetings, newconcepts were introduced during the lecture, example problems were performed by the instructorand in groups by students; outside of class students solved problems as part of homeworkassignments. The second course was taught using a flipped classroom approach where face-to-face sessions were used for active learning techniques involving group discussions, problemsolving sessions, and demonstrations. Outside of class students were required to watchscreencast tutorials on YouTube and answer concept questions as well as complete additionalhomework problems.Assessment on the effectiveness of the flipped classroom is based on performance of pre andpost quiz scores, student survey feedback, and instructor observations. Students in the flippedclassroom (test group) performed better on pre quiz scores (mean of 0.12 versus 0.03) and postquiz scores (mean of 0.58 versus 0.38) as compared to the traditional classroom (control group).Quizzes were scored 0 or 1 without partial credit, where a score of 1 indicated a correctnumerical answer and correct units. Controlling for prior academic achievement and initiallevels of content-specific achievement, a multiple linear regression analysis shows that 8% of thevariability in post quiz scores may be attributed to the instructional delivery approach. Theresults indicate that there is evidence to suggest that participation in the flipped classroom resultsin better performance than participation in the traditional lecture-based classroom