Analytical studies of new airfoils for wind turbines

Computer studies were conducted to analyze the potential gains associated with utilizing new airfoils for large wind turbine rotor blades. Attempts to include 3-dimensional stalling effects were inconclusive. It is recommended that blade pressure measurements be made to clarify the nature of blade stalling. It is also recommended that new laminar flow airfoils be used as rotor blade sections

Feasibility study of aileron and spoiler control systems for large horizontal axis wind turbines

The feasibility of using aileron or spoiler controls as alternates to pitch control for large horizontal axis wind turbines was studied. The NASA Mod-0 100 kw machine was used as the basis for the study. Specific performance studies were conducted for 20% chord ailerons over the outboard 30% span, and for 10% chord spoilers over the same portion of the span. Both control systems utilized control deflections up to 60 deg. Results of the study show that either ailerons or spoilers can provide the control necessary to limit turbine power in high wind conditions. The aileron system, as designed, provides overspeed protection at hurricane wind speeds, low wind speed starting torque of 778 N-m (574 ft. lb) at 3.6 m/sec, and a 1.3 to 1.5% increase in annual energy compared to a fixed pitch rotor. The aileron control system preliminary design study includes aileron loads analysis and the design of a failsafe flyweight actuator for overspeed protection in the event of a hydraulic system failure

Primary care physician practices in the diagnosis, treatment and management of men with chronic prostatitis/chronic pelvic pain syndrome.

To describe practice patterns of primary care physicians (PCPs) for the diagnosis, treatment and management of chronic prostatitis/chronic pelvic pain syndrome (CP/CPPS), we surveyed 556 PCPs in Boston, Chicago, and Los Angeles (RR=52%). Only 62% reported ever seeing a patient like the one described in the vignette. In all, 16% were 'not at all' familiar with CP/CPPS, and 48% were 'not at all' familiar with the National Institutes of Health classification scheme. PCPs reported practice patterns regarding CP/CPPS, which are not supported by evidence. Although studies suggest that CP/CPPS is common, many PCPs reported little or no familiarity, important knowledge deficits and limited experience in managing men with this syndrome

Improving Performance of Iterative Methods by Lossy Checkponting

Iterative methods are commonly used approaches to solve large, sparse linear systems, which are fundamental operations for many modern scientific simulations. When the large-scale iterative methods are running with a large number of ranks in parallel, they have to checkpoint the dynamic variables periodically in case of unavoidable fail-stop errors, requiring fast I/O systems and large storage space. To this end, significantly reducing the checkpointing overhead is critical to improving the overall performance of iterative methods. Our contribution is fourfold. (1) We propose a novel lossy checkpointing scheme that can significantly improve the checkpointing performance of iterative methods by leveraging lossy compressors. (2) We formulate a lossy checkpointing performance model and derive theoretically an upper bound for the extra number of iterations caused by the distortion of data in lossy checkpoints, in order to guarantee the performance improvement under the lossy checkpointing scheme. (3) We analyze the impact of lossy checkpointing (i.e., extra number of iterations caused by lossy checkpointing files) for multiple types of iterative methods. (4)We evaluate the lossy checkpointing scheme with optimal checkpointing intervals on a high-performance computing environment with 2,048 cores, using a well-known scientific computation package PETSc and a state-of-the-art checkpoint/restart toolkit. Experiments show that our optimized lossy checkpointing scheme can significantly reduce the fault tolerance overhead for iterative methods by 23%~70% compared with traditional checkpointing and 20%~58% compared with lossless-compressed checkpointing, in the presence of system failures.Comment: 14 pages, 10 figures, HPDC'1

Survey of the schools of Hinds County, Mississippi

https://egrove.olemiss.edu/ms_school_surveys/1106/thumbnail.jp

A Multicultural-Multidisciplinary Approach to Speech/Language Intervention with Black Children

There is no better way to teach African-American children than through their dialect. Yet, American schools generally respond to the language needs of black youth inappropriately. This conference presentation focuses on appropriate educational practices that support the language and cognitive development of African-American children, and the ways in which special education, speech, and language professionals can work with teachers to alter black children\u27s school environments. The introduction, Part I (Ruby Burgess), emphasizes the influence of cultural differences on students\u27 success or failure in school. Part II (Nola Burl) delineates characteristics of the multidisciplinary team approach and implications for language intervention with black children. Discussion concerns the present implementation of the approach and the role of the speech-language pathologist as a multidisciplinary team member in establishing practices that support black children\u27s language acquisition. The section concludes with an overview of current perspectives on language that are consistent with a multicultural perspective. Part III (Ralph Calhoun) explores the role of the special educator as it relates to language instruction and advocacy for African-American children. Concluding comments summarize goals and directions for multicultural education and list critical actions that need to be taken in implementing nonracist practices

Open borders, closed minds: the discursive construction of national identity in North Cyprus

The article investigates the discursive construction of a Turkish Cypriot national identity by the newspapers in North Cyprus. It questions the representation and reconstruction processes of national identity within the press and examines the various practices employed to mobilize readers around certain national imaginings. Using Critical Discourse Analysis, the article analyses news reports of the opening of border crossings in Cyprus in 2003, based on their content, the strategies used in the production of national identity and the linguistic means employed in the process. In this way, the nationalist tendencies embedded in news discourses, as well as discriminatory and exclusive practices, are sought out

Assessment of the Pseudo Geostationary Lightning Mapper Products at the Spring Program and Summer Experiment

Since 2010, the de facto Geostationary Lightning Mapper (GLM) demonstration product has been the PseudoGeostationary Lightning Mapper (PGLM) product suite. Originally prepared for the Hazardous Weather Testbed's Spring Program (specifically the Experimental Warning Program) when only four groundbased lightning mapping arrays were available, the effort now spans collaborations with several institutions and eight collaborative networks. For 2013, NASA's Shortterm Prediction Research and Transition (SPoRT) Center and NOAA's National Severe Storms Laboratory have worked to collaborate with each network to obtain data in realtime. This has gone into producing the SPoRT variant of the PGLM that was demonstrated in AWIPS II for the 2013 Spring Program. Alongside the PGLM products, the SPoRT / Meteorological Development Laboratory's total lightning tracking tool also was evaluated to assess not just another visualization of future GLM data but how to best extract more information while in the operational environment. Specifically, this tool addressed the leading request by forecasters during evaluations; provide a time series trend of total lightning in realtime. In addition to the Spring Program, SPoRT is providing the PGLM "mosaic" to the Aviation Weather Center (AWC) and Storm Prediction Center. This is the same as what is used at the Hazardous Weather Testbed, but combines all available networks into one display for use at the national centers. This year, the mosaic was evaluated during the AWC's Summer Experiment. An important distinction between this and the Spring Program is that the Summer Experiment focuses on the national center perspective and not at the local forecast office level. Specifically, the Summer Experiment focuses on aviation needs and concerns and brings together operational forecaster, developers, and FAA representatives. This presentation will focus on the evaluation of SPoRT's pseudoGLM products in these separate test beds. The emphasis will be on how future GLM observations can support operations at both the local and national scale and how the PGLM was used in combination with other lightning data sets. Evaluations for the PGLM were quite favorable with forecasters appreciating the high temporal resolution, the ability to look for rapid increases in lightning activity ahead of severe weather, as well as situational awareness for where convection is firing and for flight routing