Louisiana State University

About: Louisiana State University is a education organization based out in Baton Rouge, Louisiana, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 40206 authors who have published 76587 publications receiving 2566076 citations. The organization is also known as: LSU & Louisiana State University and Agricultural and Mechanical College.

Classification of the minerals of the tourmaline group

Abstract: A systematic classification of the tourmaline-group minerals, general formula X Y3 Z6 (Γ6Oi8) (B03)3 V3W, is proposed, based on chemical composition and ordering at the different crystallographic sites of the tourmaline structure. There are currently thirteen accepted tourmaline species. However, based on the actual chemical composi­ tions of holotype material, several of these species were imprecisely or incorrectly defined. A proper definition of these species is proposed. A crystal-chemical feature that extends the number of possible end-members is the anion occupancy of the W-site (dominated by OH-, F~ or O2-) and the V-site (dominated by OH- or, more rarely, 02~). Thus, based on the W-site alone, there can be hydroxy-, fluor-, or oxy-end-members. Furthermore, the presence of dominant O2- at the W-site commonly requires local cation-ordering at the Y- and Z-sites. The tourmaline-group min­ erals can be divided into three principal groups based on the dominant species at the X-site: alkali tourmalines (Na), calcic tourmalines (Ca) and X-site-vacant tourmalines (O: vacancy). These groups are further divided, initially based on the W-site occupancy, then by the (actual or inferred) V-site occupancy, next by the (actual or inferred) F-site occupancy and, finally, by the (actual or inferred) Z-site occupancy. A systematic classification procedure is developed that takes into account different levels of knowledge of the chemical composition and site occupancy of the tourmaline. Several examples are used to illustrate the application of this classification procedure.

Tests of Equal Forecast Accuracy and Encompassing for Nested Models

Abstract: We examine the asymptotic and finite-sample properties of tests for equal forecast accuracy and encompassing applied to 1-step ahead forecasts from nested parametric models. We first derive the asymptotic distributions of two standard tests and one new test of encompassing. Tables of asymptotically valid critical values are provided. Monte Carlo methods are then used to evaluate the size and power of the tests of equal forecast accuracy and encompassing. The simulations indicate that post-sample tests can be reasonably well sized. Of the post-sample tests considered, the encompassing test proposed in this paper is the most powerful. We conclude with an empirical application regarding the predictive content of unemployment for inflation.

Bivariate Flood Frequency Analysis Using the Copula Method

Abstract: Using the copula method, bivariate distributions of flood peak and volume, and flood volume and duration were derived. A major advantage of this method is that marginal distributions of individual variables (i.e., flood peak, volume, and duration) can be of any form and the variables can be correlated. The copula method was applied to obtain the conditional return periods that are needed for hydrologic design. The derived distributions were tested using flood data from Amite River at Denham Springs, La., and the Ashuapmushuan River at Saguenay, Quebec, Canada. The derived distributions were also compared with the Gumbel mixed and the bivariate Box–Cox transformed normal distributions. The copula-based distributions were found to be in better agreement with plotting position-based frequency estimates than were other distributions.

Dabigatran Versus Warfarin in Patients With Atrial Fibrillation An Analysis of Patients Undergoing Cardioversion

Abstract: Background–The Randomized Evaluation of Long-Term Anticoagulation Therapy (RE-LY) trial compared dabigatran 110 mg BID (D110) and 150 mg BID (D150) with warfarin for stroke prevention in 18 113 patients with nonvalvular atrial fibrillation Methods and Results–Cardioversion on randomized treatment was permitted Precardioversion transesophageal echocardiography was encouraged, particularly in dabigatran-assigned patients Data from before, during, and 30 days after cardioversion were analyzed A total of 1983 cardioversions were performed in 1270 patients: 647, 672, and 664 in the D110, D150, and warfarin groups, respectively For D110, D150, and warfarin, transesophageal echocardiography was performed before 255%, 241%, and 133% of cardioversions, of which 18%, 12%, and 11% were positive for left atrial thrombi Continuous treatment with study drug for ≥3 weeks before cardioversion was lower in D110 (764%) and D150 (792%) compared with warfarin (855%; P<001 for both) Stroke and systemic emboli

Work characteristics and employee health and well-being: Test of a model of healthy work organization.

Abstract: This paper presents an initial test and validation of a model of healthy work organization. A questionnaire based on the proposed model was completed by 1,130 employees of a national retailer. The instrument measured 29 first-order constructs underlying the six higher-order domains of the model. The overall model fit and relationships among the second-order factors were examined using AMOS structural equation-modelling procedures. The structural analyses presented here support the proposed model. An acceptable overall fit was demonstrated, and all second-order, and second- to first-order, relationships were significant. Employees' perceptions of their organization affect their perception of the climate, which impacts the way people relate to their job and see their future in the organization, ultimately impacting their work adjustment, health and well-being. This model has implications for both research and practice.