Texas A&M University

About: Texas A&M University is a education organization based out in College Station, Texas, United States. It is known for research contribution in the topics: Population & Finite element method. The organization has 72169 authors who have published 164372 publications receiving 5764236 citations.

Behavior Assessment System for Children

Abstract: The Behavior Assessment System for Children, Second Edition (BASC–2; Reynolds & Kamphaus, 2004) is a multimethod, multidimensional system used to evaluate the behavior and self-perceptions of children, adolescents, and young adults aged 2 through 25 years. The BASC–2 is multimethod in that it has the following components, which may be used individually or in any combination: (1) two rating scales, one for teachers (Teacher Rating Scales, or TRS) and one for parents (Parent Rating Scales, or PRS), which gather descriptions of the child's observable behavior, each divided into age-appropriate forms; (2) a self-report scale (Self-Report of Personality, or SRP), on which the child or young adult can describe his or her emotions and self-perceptions; (3) a Structured Developmental History (SDH) form; (4) a form for recording and classifying directly observed classroom behavior (Student Observation System, or SOS), which is also available for PDA applications as an electronic version known as the BASC–2 POP or Portable Observation Program; and (5) a self-report for parents of children ages 2–18 years, designed to capture a parent's perspective on the parent-child relationship in such domains as communication, disciplinary styles, attachment, involvement, and others. Keywords: diagnosis; behavior; behavioral assessment; psychopathology

SPECTRA AND HUBBLE SPACE TELESCOPE LIGHT CURVES OF SIX TYPE Ia SUPERNOVAE AT 0.511 <z< 1.12 AND THE UNION2 COMPILATION ∗

Abstract: We report on work to increase the number of well-measured Type Ia supernovae (SNe Ia) at high redshifts. Light curves, including high signal-to-noise HST data, and spectra of six SNe Ia that were discovered during 2001 are presented. Additionally, for the two SNe with z > 1, we present groundbased J-band photometry from Gemini and the VLT. These are among the most distant SNe Ia for which ground based near-IR observations have been obtained. We add these six SNe Ia together with other data sets that have recently become available in the literature to the Union compilation (Kowalski et al. 2008). We have made a number of refinements to the Union analysis chain, the most important ones being the refitting of all light curves with the SALT2 fitter and an improved handling of systematic errors. We call this new compilation, consisting of 557 supernovae, the Union2

The Composition of Boards of Directors and Strategic Control: Effects on Corporate Strategy

Abstract: Boards of directors of large corporations provide a governance safeguard to both equity capital and managerial employment contracts. Thus, the board is a potentially important instrument of internal control. This article develops theory and propositions concerning (a) the relation among ownership, managerial control, and the composition of the boards of directors; (b) the relation between the composition of the boards and control strategies (strategic versus financial controls); and (c) the relation among choice of control, corporate strategy, and strategic choice.

Improved Cosmological Constraints from New, Old, and Combined Supernova Data Sets

Abstract: We present a new compilation of Type Ia supernovae (SNe Ia), a new data set of low-redshift nearby-Hubble-flow SNe, and new analysis procedures to work with these heterogeneous compilations This "Union" compilation of 414 SNe Ia, which reduces to 307 SNe after selection cuts, includes the recent large samples of SNe Ia from the Supernova Legacy Survey and ESSENCE Survey, the older data sets, as well as the recently extended data set of distant supernovae observed with the Hubble Space Telescope (HST) A single, consistent, and blind analysis procedure is used for all the various SN Ia subsamples, and a new procedure is implemented that consistently weights the heterogeneous data sets and rejects outliers We present the latest results from this Union compilation and discuss the cosmological constraints from this new compilation and its combination with other cosmological measurements (CMB and BAO) The constraint we obtain from supernovae on the dark energy density is ΩΛ = 0713+ 0027−0029(stat)+ 0036−0039(sys) , for a flat, ΛCDM universe Assuming a constant equation of state parameter, w, the combined constraints from SNe, BAO, and CMB give w = − 0969+ 0059−0063(stat)+ 0063−0066(sys) While our results are consistent with a cosmological constant, we obtain only relatively weak constraints on a w that varies with redshift In particular, the current SN data do not yet significantly constrain w at z > 1 With the addition of our new nearby Hubble-flow SNe Ia, these resulting cosmological constraints are currently the tightest available

Generation of single optical plasmons in metallic nanowires coupled to quantum dots

Abstract: Control over the interaction between single photons and individual optical emitters is an outstanding problem in quantum science and engineering. It is of interest for ultimate control over light quanta, as well as for potential applications such as efficient photon collection, single-photon switching and transistors, and long-range optical coupling of quantum bits. Recently, substantial advances have been made towards these goals, based on modifying photon fields around an emitter using high-finesse optical cavities. Here we demonstrate a cavity-free, broadband approach for engineering photon-emitter interactions via subwavelength confinement of optical fields near metallic nanostructures. When a single CdSe quantum dot is optically excited in close proximity to a silver nanowire, emission from the quantum dot couples directly to guided surface plasmons in the nanowire, causing the wire's ends to light up. Non-classical photon correlations between the emission from the quantum dot and the ends of the nanowire demonstrate that the latter stems from the generation of single, quantized plasmons. Results from a large number of devices show that efficient coupling is accompanied by more than 2.5-fold enhancement of the quantum dot spontaneous emission, in good agreement with theoretical predictions.