Predesign study for a modern 4-bladed rotor for the NASA rotor systems research aircraft

Trade-off study results and the rationale for the final selection of an existing modern four-bladed rotor system that can be adapted for installation on the Rotor Systems Research Aircraft (RSRA) are reported. The results of the detailed integration studies, parameter change studies, and instrumentation studies and the recommended plan for development and qualification of the rotor system is also given. Its parameter variants, integration on the RSRA, and support of ground and flight test programs are also discussed

Super-resolution of faces using texture mapping on a generic 3D model

This paper proposes a novel face texture mapping framework to transform faces with different poses into a unique texture map. Under this framework, texture mapping can be realized by utilizing a generic 3D face model, standard Haar-like feature based detector, active appearance model and pose estimation algorithm. By this texture map, correspondence of every pixel at the face across multiple distinct input images can then be established, which enables super-resolution algorithms to be applied directly on registered texture map to render high resolution faces. This paper details the proposed framework, and illustrates how the proposed super-resolution algorithm works with the help of weighted average and median filters. Convincing experimental results are also presented to validate the effectiveness of the proposed framework and superresolution algorithm. © 2009 IEEE.published_or_final_versio

High School Teachers’ Perceived Self-Efficacy in Teaching Literacy across the Curriculum in Tennessee First Core Region 1 High Schools

At the high school level teachers are often departmentalized by their content area and do not teach subjects outside of their specialties. Common Core State Standards (CCSS) introduced literacy standards across the curriculum requiring reading and writing instruction in all courses. The adoption not only affected traditional literacy teachers but also science, math, social studies, and career and technical education teachers who may have had little or no training or experience in teaching literacy to adolescents. These teachers, because of little training or experience in teaching literacy, may feel unprepared for the CCSS literacy shifts or inadequate in delivering literacy instruction. This study was designed to explore teacher perceived self-efficacy after the implementation of new literacy standards in Tennessee. The purpose of this study was to evaluate high school teachers’ perceptions with regard to self-efficacy and literacy instruction across the curriculum. Data were collected through online, voluntary surveys using Likert scaling and one open-ended response question. The sample included Tennessee high school teachers from 3 counties in Tennessee First Core Region 1 high schools who had taught math, science, social studies, career and technical education, or ELA. This study found no significant difference based on self-efficacy and content area, level of teaching experience, or gender. There was also no significant difference based on literacy efficacy and level of teaching experience or gender. There was a significant difference based on literacy efficacy and content area. ELA teachers were more significantly confident in teaching literacy than nonELA teachers

Unexpected drop of dynamical heterogeneities in colloidal suspensions approaching the jamming transition

As the glass (in molecular fluids\cite{Donth}) or the jamming (in colloids and grains\cite{LiuNature1998}) transitions are approached, the dynamics slow down dramatically with no marked structural changes. Dynamical heterogeneity (DH) plays a crucial role: structural relaxation occurs through correlated rearrangements of particle ``blobs'' of size $\xi$\cite{WeeksScience2000,DauchotPRL2005,Glotzer,Ediger}. On approaching these transitions, $\xi$ grows in glass-formers\cite{Glotzer,Ediger}, colloids\cite{WeeksScience2000,BerthierScience2005}, and driven granular materials\cite{KeysNaturePhys2007} alike, strengthening the analogies between the glass and the jamming transitions. However, little is known yet on the behavior of DH very close to dynamical arrest. Here, we measure in colloids the maximum of a ``dynamical susceptibility'', $\chi^*$, whose growth is usually associated to that of $\xi$\cite{LacevicPRE}. $\chi^*$ initially increases with volume fraction $\phi$, as in\cite{KeysNaturePhys2007}, but strikingly drops dramatically very close to jamming. We show that this unexpected behavior results from the competition between the growth of $\xi$ and the reduced particle displacements associated with rearrangements in very dense suspensions, unveiling a richer-than-expected scenario.Comment: 1st version originally submitted to Nature Physics. See the Nature Physics website fro the final, published versio

Credit bureaus between risk-management, creditworthiness assessment and prudential supervision

"This text may be downloaded for personal research purposes only. Any additional reproduction for other purposes, whether in hard copy or electronically, requires the consent of the author. If cited or quoted, reference should be made to the full name of the author, the title, the working paper or other series, the year, and the publisher."This paper discusses the role and operations of consumer Credit Bureaus in the European Union in the context of the economic theories, policies and law within which they work. Across Europe there is no common practice of sharing the credit data of consumers which can be used for several purposes. Mostly, they are used by the lending industry as a practice of creditworthiness assessment or as a risk-management tool to underwrite borrowing decisions or price risk. However, the type, breath, and depth of information differ greatly from country to country. In some Member States, consumer data are part of a broader information centralisation system for the prudential supervision of banks and the financial system as a whole. Despite EU rules on credit to consumers for the creation of the internal market, the underlying consumer data infrastructure remains fragmented at national level, failing to achieve univocal, common, or defined policy objectives under a harmonised legal framework. Likewise, the establishment of the Banking Union and the prudential supervision of the Euro area demand standardisation and convergence of the data used to measure debt levels, arrears, and delinquencies. The many functions and usages of credit data suggest that the policy goals to be achieved should inform the legal and institutional framework of Credit Bureaus, as well as the design and use of the databases. This is also because fundamental rights and consumer protection concerns arise from the sharing of credit data and their expanding use

Cube law, condition factor and weight-length relationships: history, meta-analysis and recommendations

This study presents a historical review, a meta-analysis, and recommendations for users about weight–length relationships, condition factors and relative weight equations. The historical review traces the developments of the respective concepts. The meta-analysis explores 3929 weight–length relationships of the type W = aLb for 1773 species of fishes. It shows that 82% of the variance in a plot of log a over b can be explained by allometric versus isometric growth patterns and by different body shapes of the respective species. Across species median b = 3.03 is significantly larger than 3.0, thus indicating a tendency towards slightly positive-allometric growth (increase in relative body thickness or plumpness) in most fishes. The expected range of 2.5 < b < 3.5 is confirmed. Mean estimates of b outside this range are often based on only one or two weight–length relationships per species. However, true cases of strong allometric growth do exist and three examples are given. Within species, a plot of log a vs b can be used to detect outliers in weight–length relationships. An equation to calculate mean condition factors from weight–length relationships is given as Kmean = 100aLb−3. Relative weight Wrm = 100W/(amLbm) can be used for comparing the condition of individuals across populations, where am is the geometric mean of a and bm is the mean of b across all available weight–length relationships for a given species. Twelve recommendations for proper use and presentation of weight–length relationships, condition factors and relative weight are given

Global Jacquet-Langlands correspondence, multiplicity one and classification of automorphic representations

In this paper we show a local Jacquet-Langlands correspondence for all unitary irreducible representations. We prove the global Jacquet-Langlands correspondence in characteristic zero. As consequences we obtain the multiplicity one and strong multiplicity one theorems for inner forms of GL(n) as well as a classification of the residual spectrum and automorphic representations in analogy with results proved by Moeglin-Waldspurger and Jacquet-Shalika for GL(n).Comment: 49 pages; Appendix by N. Grba

An analysis of micronutrient consumption of mothers using the Demographic and Health Surveys of the Dominican Republic

BACKGROUND: Micronutrient deficiency (vitamin A, iron, and iodine) is highly prevalent in the Dominican Republic as indicated by food consumption patterns, which are not reflective of consumption of micronutrient dense foods. Previous studies (Neves, Ramalho, Padilha, & Saunders, 2014) have shown that nutrition education offered by prenatal providers has a positive impact on nutrition outcomes in mothers and children. Little research exists which examines the difference in micronutrient consumption among mothers in the Dominican Republic. The aim of this study was to determine differences in micronutrient rich food consumption of mothers in the Dominican Republic based on type of prenatal provider (General practitioner, Obstetrics/gynecology (OBGYN) or no Provider). METHODS: The 2007 Dominican Republic DHS dataset was employed for this study. Odds ratios from multivariate logistic regression analyses were used to determine association between sources of prenatal service and micronutrient food intake. Statistical adjustments were made for residence, wealth index, education, marital status, smoking age and number children ever had. RESULTS: Compared with mothers who did not utilize any of the prenatal services, mothers who sought care from General practitioners and OBGYN had increased odds of consuming vitamin A, iodine and iron micronutrient rich foods, adjusting for residence, wealth index, education, marital status, smoking age and mother’s total number of children. However, the associations were not statistically significant. Compared to mothers who did not use prenatal care, mothers who used the services of General practitioners and OB/GYNs had greater odds, (OR=1.09; 95% CI:0.85-1.41) and (OR=1.29; 95% CI:1.01-1.65) respectively, of consuming at least one micronutrient food. Compared to mothers who did not use prenatal care, mothers who used the services of General practitioners (OR=1.31; 95% CI:1.00-1.70) and OB/GYNs and (OR=1.36; 95% CI:1.05-1.75), had greater odds of consuming at least two micronutrient foods. The corresponding odds ratios for consuming all three micronutrients for mothers using the services of General practitioners and OBGYN were 1.48 (95% CI=0.80-2.74) and 1.51 (95% CI=0.84-2.74), respectively. Prenatal Care and Micronutrient Dense Foods 3 DISCUSSION: Improvements and access to programs providing nutrition education for prenatal care providers, and medical and nutrition assistance to poor mothers may help to increase micronutrient rich food consumption in the Dominican Republic. KEY WORDS: micronutrient, diet, maternal, Dominican Republi

Holographic Vitrification

We establish the existence of stable and metastable stationary black hole bound states at finite temperature and chemical potentials in global and planar four-dimensional asymptotically anti-de Sitter space. We determine a number of features of their holographic duals and argue they represent structural glasses. We map out their thermodynamic landscape in the probe approximation, and show their relaxation dynamics exhibits logarithmic aging, with aging rates determined by the distribution of barriers.Comment: 100 pages, 25 figure

Multiwavelength studies of MHD waves in the solar chromosphere: An overview of recent results

The chromosphere is a thin layer of the solar atmosphere that bridges the relatively cool photosphere and the intensely heated transition region and corona. Compressible and incompressible waves propagating through the chromosphere can supply significant amounts of energy to the interface region and corona. In recent years an abundance of high-resolution observations from state-of-the-art facilities have provided new and exciting ways of disentangling the characteristics of oscillatory phenomena propagating through the dynamic chromosphere. Coupled with rapid advancements in magnetohydrodynamic wave theory, we are now in an ideal position to thoroughly investigate the role waves play in supplying energy to sustain chromospheric and coronal heating. Here, we review the recent progress made in characterising, categorising and interpreting oscillations manifesting in the solar chromosphere, with an impetus placed on their intrinsic energetics.Comment: 48 pages, 25 figures, accepted into Space Science Review