A QUANTITATIVE SURVEY ANALYSIS OF ELEMENTARY PRESERVICE TEACHER PERCEPTIONS OF ASSESSMENT TASKS IN SCIENCE COURSEWORK

This replication survey research study sought to further understand preservice elementary teachers’ perceptions of assessment tasks they encountered in secondary science coursework. Students are assessed through informal and formal assessments, including close-ended and open-ended questions, through classroom and high-stakes assessments. With great significance placed on high-stakes state assessments, classroom instruction and assessments oftentimes mirror the format of state assessments. The researcher administered a validated Likert scale inventory, the Perceptions of Assessment Tasks Inventory (PATI), to preservice elementary teachers to examine their perceptions of how assessment tasks reflected their knowledge and understanding of science assessment tasks. The researcher found the research participants’ perceptions were more positive regarding assessment tasks the teacher had more control over, including the alignment of learning with assessments, and transparency of assessments. The research participants’ least positive perceptions were assessment tasks where students had influence over their assessments, including student consultation and diversity in assessments

N.C. Medicaid Reform: A Bipartisan Path Forward

The North Carolina Medicaid program currently constitutes 32% of the state budget and provides insurance coverage to 18% of the state’s population. At the same time, 13% of North Carolinians remain uninsured, and even among the insured, significant health disparities persist across income, geography, education, and race. The Duke University Bass Connections Medicaid Reform project gathered to consider how North Carolina could use its limited Medicaid dollars more effectively to reduce the incidence of poor health, improve access to healthcare, and reduce budgetary pressures on the state’s taxpayers. This report is submitted to North Carolina’s policymakers and citizens. It assesses the current Medicaid landscape in North Carolina, and it offers recommendations to North Carolina policymakers concerning: (1) the construction of Medicaid Managed Care markets, (2) the potential and dangers of instituting consumer-driven financial incentives in Medicaid benefits, (3) special hotspotting strategies to address the needs and escalating costs of Medicaid\u27s high-utilizers and dual-eligibles, (4) the emerging benefits of pursuing telemedicine and associated reforms to reimbursement, regulation, and Graduate Medical Education programs that could fuel telemedicine solutions to improve access and delivery. The NC Medicaid Reform Advisory Team includes: Deanna Befus, Duke School of Nursing, PhD ‘17Madhulika Vulimiri, Duke Sanford School of Public Policy, MPP ‘18Patrick O’Shea, UNC School of Medicine/Fuqua School of Business, MD/MBA \u2717Shanna Rifkin, Duke Law School, JD ‘17Trey Sinyard, Duke School of Medicine/Fuqua School of Business, MD/MBA \u2717Brandon Yan, Duke Public Policy, BA \u2718Brooke Bekoff, UNC Political Science, BA \u2719Graeme Peterson, Duke Public Policy, BA ‘17Haley Hedrick, Duke Psychology, BS ‘19Jackie Lin, Duke Biology, BS \u2718Kushal Kadakia, Duke Biology and Public Policy, BS ‘19Leah Yao, Duke Psychology, BS ‘19Shivani Shah, Duke Biology and Public Policy, BS ‘18Sonia Hernandez, Duke Economics, BS \u2719Riley Herrmann, Duke Public Policy, BA \u271

Design of a laminar-flow-control supercritical airfoil for a swept wing

An airfoil was analytically designed and analyzed for a combination of supercritical flow and laminar flow control (LFC) by boundary layer suction. A shockless inverse method was used to design an airfoil and an analysis method was used in lower surface redesign work. The laminar flow pressure distributions were computed without a boundary layer under the assumption that the laminar boundary layer would be kept thin by suction. Inviscid calculations showed that this 13.5 percent thick airfoil has shockless flows for conditions at and below the design normal Mach number of 0.73 and the design section lift coefficient of 0.60, and that the maximum local normal Mach number is 1.12 at the design point. The laminar boundary layer instabilities can be controlled with suction but the undercut leading edge of the airfoil provides a low velocity, constant pressure coefficients region which is conducive to laminar flow without suction. The airfoil was designed to be capable of lift recovery with no suction by the deflection of a small trailing edge flap

Scalability Analysis of Parallel GMRES Implementations

Applications involving large sparse nonsymmetric linear systems encourage parallel implementations of robust iterative solution methods, such as GMRES(k). Two parallel versions of GMRES(k) based on different data distributions and using Householder reflections in the orthogonalization phase, and variations of these which adapt the restart value k, are analyzed with respect to scalability (their ability to maintain fixed efficiency with an increase in problem size and number of processors).A theoretical algorithm-machine model for scalability is derived and validated by experiments on three parallel computers, each with different machine characteristics

Parrondo's games with chaotic switching

This paper investigates the different effects of chaotic switching on Parrondo's games, as compared to random and periodic switching. The rate of winning of Parrondo's games with chaotic switching depends on coefficient(s) defining the chaotic generator, initial conditions of the chaotic sequence and the proportion of Game A played. Maximum rate of winning can be obtained with all the above mentioned factors properly set, and this occurs when chaotic switching approaches periodic behavior.Comment: 11 pages, 9 figure

Astronomical, physical, and meteorological parameters for planetary atmospheres

A newly compiled table of astronomical, physical, and meteorological parameters for planetary atmospheres is presented. Formulae and explanatory notes for their application and a complete listing of sources are also given

Discrete--time ratchets, the Fokker--Planck equation and Parrondo's paradox

Parrondo's games manifest the apparent paradox where losing strategies can be combined to win and have generated significant multidisciplinary interest in the literature. Here we review two recent approaches, based on the Fokker-Planck equation, that rigorously establish the connection between Parrondo's games and a physical model known as the flashing Brownian ratchet. This gives rise to a new set of Parrondo's games, of which the original games are a special case. For the first time, we perform a complete analysis of the new games via a discrete-time Markov chain (DTMC) analysis, producing winning rate equations and an exploration of the parameter space where the paradoxical behaviour occurs.Comment: 17 pages, 5 figure