Standard Room Fire Test Research at the National Bureau of Standards

Research results with the proposed ASTM standard room fire test for interior finish materials are presented. The materials selected for the study were two untreated plywoods, a fire-retarded plywood, polystyrene foam, polyisocyanurate foam, and gypsum board. Three 900 s duration test scenarios were considered. Scenario A is a constant 180 kW ignition source exposure. Scenario B achieves the same maximum exposure after three intervals of 30 s each in which the heat release rate is increased in equal steps of 45 kW. Scenario C evaluates a material over a 300 s exposure at a nominal 45 kW, with another 300 s exposure at 180 kW, followed by 300 s at zero exposure. This zero exposure allows the material to be screened for continuation of burning afterwards. The study demonstrated that all three scenarios could adequately differentiate material fire behavior, in terms of the maximum degree of fire buildup attained and the time to reach the maximum, for the materials selected. However 1 scenario C would allow a more comprehensive evaluation of materials. Thermal radiation incident on the floor and room and doorway air temperatures were found to be suitable parameters for determining room fire buildup including room flashover. Surface flame spread and rate of heat release are discussed for the room fires. Unit area bench-scale rate of heat release data from the cone calorimeter may be predictive of the full-scale data when melting and dripping (which changes the active burning area) or very slow to ignite fire retarded materials (whose retardants may be baked out) are not involved. Further full-scale testing is desirable to establish more confidence and delineate the limits of validity

I am Smart, Therefore I Can: Examining the Relationship between IQ and Self-efficacy across Cultures

The purpose of this article is to examine the relationship between intelligence (IQ) and self-efficacy in children and adolescents living in the United States and Nicaragua. The sample consisted of 90 (46 male, 44 female) students (mean age = 11.57 years, SD = 3.0 years) referred by school administrators and faculty. United States (US) participants (n = 27) resided in rural counties in the Northwest. The other group consisted of 63 students from Central America. A comparison between groups revealed that in the US, sample higher grades and IQ scores are typically associated with higher levels of self-efficacy. However in the Nicaraguan sample, both IQ scores and grades were not associated with self-efficacy, although age was correlated with self-efficacy. Results suggest that the construct of self-efficacy might change depending on whether one belongs to an individualistic or collectivistic society. Additionally, the effects of socioeconomic factors might influence perceived ability even more than intellectual abilities

If I Value Myself, I Value School: The Protective Effect of Self-esteem Among Abused Females

Children who have been severely maltreated tend to perform significantly below their non-maltreated peers in standardized tests, earn lower grades and have the most discipline issues in the school setting. There is evidence that self-esteem (SE) may be a protective factor for youth with regard to negative emotional outcomes. The role of self-esteem needs to be explored further in more collectivistic cultures. The purpose of this study was to explore the relationship between physical abuse, SE and school attitudes. Participants included 14 females rescued from a city landfi ll in Nicaragua (ages 7 – 17 years, M = 12.44), half of whom had reported being beaten. SE and attitude toward school (ATS) were assessed using the Spanish Behavior Assessment System for Children. Grade point average (GPA) was obtained from their schools. Females who were beaten had signifi cantly lower SE and a more negative ATS. Their GPA was lower, but not significantly. When SE and abuse were considered together, the effect of abuse on school attitudes was non-significant, suggesting that SE is a protective factor for the effects of abuse on ATS

The Poverty Puzzle: The Surprising Difference between Wealthy and Poor Students for Self-efficacy and Academic Achievement

This study explored the relationship between intellectual ability, socioeconomic status (SES), academic achievement and self-efficacy in a cross-cultural sample. Data from 90 students (63 students from Central America and 27 from the US) showed that regardless of culture or IQ, students from low SES families had signifi cantly lower grade point averages than students from medium- or high-SES families. Unexpectedly, data showed that regardless of culture or IQ, students from high-SES families had the lowest self-efficacy, but the highest academic performance. Results suggest that self-efficacy is likely to be related to expectations and selfperception beyond IQ or culture

Psychophysiological effects of synchronous versus asynchronous music during cycling

"This is a non-final version of an article published in final form in (https://journals.lww.com/acsm-msse/pages/articleviewer.aspx?year=2014&issue=02000&article=00024&type=abstract )"Purpose: Synchronizing movement to a musical beat may reduce the metabolic cost of exercise, but findings to date have been equivocal. Our aim was to examine the degree to which the synchronous application of music moderates the metabolic demands of a cycle ergometer task. Methods: Twenty-three recreationally active men made two laboratory visits. During the first visit, participants completed a maximal incremental ramp test on a cycle ergometer. At the second visit, they completed four randomized 6-min cycling bouts at 90% of ventilatory threshold (control, metronome, synchronous music, and asynchronous music). Main outcome variables were oxygen uptake, HR, ratings of dyspnea and limb discomfort, affective valence, and arousal. Results: No significant differences were evident for oxygen uptake. HR was lower under the metronome condition (122 T 15 bpm) compared to asynchronous music (124 T 17 bpm) and control (125 T 16 bpm). Limb discomfort was lower while listening to the metronome (2.5 T 1.2) and synchronous music (2.3 T 1.1) compared to control (3.0 T 1.5). Both music conditions, synchronous (1.9 T 1.2) and asynchronous (2.1 T 1.3), elicited more positive affective valence compared to metronome (1.2 T 1.4) and control (1.2 T 1.2), while arousal was higher with synchronous music (3.4 T 0.9) compared to metronome (2.8 T 1.0) and control (2.8 T 0.9). Conclusions: Synchronizing movement to a rhythmic stimulus does not reduce metabolic cost but may lower limb discomfort. Moreover, synchronous music has a stronger effect on limb discomfort and arousal when compared to asynchronous music

GeoTextMESS: result fusion with fuzzy Borda ranking in geographical information retrieval

In this paper we discuss the integration of different GIR systems by means of a fuzzy Borda method for result fusion. Two of the systems, the one by the Universidad Politécnica de Valencia and the one of the Universidad of Jaén participated to the GeoCLEF task under the name TextMess. The proposed result fusion method takes as input the document lists returned by the different systems and returns a document list where the documents are ranked according to the fuzzy Borda voting scheme. The obtained results show that the fusion method allows to improve the results of the component systems, although the fusion is not optimal, because it is effective only if the components return a similar set of relevant documents.Peer ReviewedPostprint (author’s final draft

Radiative corrections to low energy neutrino reactions

We show that the radiative corrections to charged current (CC) nuclear reactions with an electron(positron) in the final state are described by a universal function. The consistency of our treatment of the radiative corrections with the procedure used to extract the value of the axial coupling constant $g_A$ is discussed. To illustrate we apply our results to (anti)neutrino deuterium disintegration and to $pp$ fusion in the sun. The limit of vanishing electron mass is considered, and a simple formula valid for E_{obs}\gsim 1 MeV is obtained. The size of the nuclear structure-dependent effects is also discussed. Finally, we consider CC transitions with an electron(positron) in the initial state and discuss some applications to electron capture reactions.Comment: 23 pages, 5 figure

First-principles study of nucleation, growth, and interface structure of Fe/GaAs

We use density-functional theory to describe the initial stages of Fe film growth on GaAs(001), focusing on the interplay between chemistry and magnetism at the interface. Four features appear to be generic: (1) At submonolayer coverages, a strong chemical interaction between Fe and substrate atoms leads to substitutional adsorption and intermixing. (2) For films of several monolayers and more, atomically abrupt interfaces are energetically favored. (3) For Fe films over a range of thicknesses, both Ga- and As-adlayers dramatically reduce the formation energies of the films, suggesting a surfactant-like action. (4) During the first few monolayers of growth, Ga or As atoms are likely to be liberated from the interface and diffuse to the Fe film surface. Magnetism plays an important auxiliary role for these processes, even in the dilute limit of atomic adsorption. Most of the films exhibit ferromagnetic order even at half-monolayer coverage, while certain adlayer-capped films show a slight preference for antiferromagnetic order.Comment: 11 two-column pages, 12 figures, to appear in Phys. Rev.

Analysis of and workarounds for element reversal for a finite element-based algorithm for warping triangular and tetrahedral meshes

We consider an algorithm called FEMWARP for warping triangular and tetrahedral finite element meshes that computes the warping using the finite element method itself. The algorithm takes as input a two- or three-dimensional domain defined by a boundary mesh (segments in one dimension or triangles in two dimensions) that has a volume mesh (triangles in two dimensions or tetrahedra in three dimensions) in its interior. It also takes as input a prescribed movement of the boundary mesh. It computes as output updated positions of the vertices of the volume mesh. The first step of the algorithm is to determine from the initial mesh a set of local weights for each interior vertex that describes each interior vertex in terms of the positions of its neighbors. These weights are computed using a finite element stiffness matrix. After a boundary transformation is applied, a linear system of equations based upon the weights is solved to determine the final positions of the interior vertices. The FEMWARP algorithm has been considered in the previous literature (e.g., in a 2001 paper by Baker). FEMWARP has been succesful in computing deformed meshes for certain applications. However, sometimes FEMWARP reverses elements; this is our main concern in this paper. We analyze the causes for this undesirable behavior and propose several techniques to make the method more robust against reversals. The most successful of the proposed methods includes combining FEMWARP with an optimization-based untangler.Comment: Revision of earlier version of paper. Submitted for publication in BIT Numerical Mathematics on 27 April 2010. Accepted for publication on 7 September 2010. Published online on 9 October 2010. The final publication is available at http://www.springerlink.co