Search results for " Reference"

The origin of in-plane stresses in axially moving orthotropic continua

2016

In this paper, we address the problem of the origin of in-plane stresses in continuous, two-dimensional high-speed webs. In the case of thin, slender webs, a typical modeling approach is the application of a stationary in-plane model, without considering the effects of the in-plane velocity field. However, for high-speed webs this approach is insufficient, because it neglects the coupling between the total material velocity and the deformation experienced by the material. By using a mixed Lagrange–Euler approach in model derivation, the solid continuum problem can be transformed into a solid continuum flow problem. Mass conservation in the flow problem, and the behaviour of free edges in th…

Diffusive Modeling of Aggradation and Degradation in Artificial Channels

2008

The unsteady flow and solid transport simulation problem in artificial channels is solved using a three-equation model, coupled with a local erosion law. The three equations are the water mass and momentum balance equations, as well as the total solid load balance equation. It is shown that even during severe hydrological events inertial terms can be neglected in the momentum equation without any substantial change in the solution sought. Empirical equilibrium formulas were used to estimate the solid load as a function of the flow variables. Local erosion, due to the scour generated at the jump between two channels connected at different bottom elevations, was estimated adapting a literatur…

Objective Bayesian point and region estimation in location-scale models.

2007

Point and region estimation may both be described as specific decision problems. In point estimation, the action space is the set of possible values of the quantity on interest; in region estimation, the action space is the set of its possible credible regions. Foundations dictate that the solution to these decision problems must depend on both the utility function and the prior distribution. Estimators intended for general use should surely be invariant under one-to-one transformations, and this requires the use of an invariant loss function; moreover, an objective solution requires the use of a prior which does not introduce subjective elements. The combined use of an invariant informatio…

Assessment of Iron Intake in Relation to Tolerable Upper Intake Levels

2018

A Simulation Analysis of VSM Control for RES plants in a Small Mediterranean Island

2020

The paper presents an application of Virtual Synchronous Machine control for managing inverter-interfaced renewable energy sources in a small Mediterranean island not supplied by the main grid. In the proposed analysis, the island's renewables-based generators area assumed interfaced to the grid by voltage source converters with a swing controller and a vector-current controller with two different options for the reference current for regulating the voltage at the Point of Common Coupling and the active power output. The system, modeled in PScad environment, allows to verify the response of the renewables-based generators with VSM control in the presence of a fault in the grid.

Acute pancreatitis in children. An Italian multicentre study

2002

Abstract Aim . To evaluate the clinical, morphological and aetiological aspects of acute pancreatitis in children in Italy. Patients . The hospital records of 50 consecutive patients with acute pancreatitis observed in 5 Italian Pediatric Departments were reviewed. Results . A total of 25 males and 25 females (median age 10.5 years, range 2–17) were studied. Of these patients, 48 (96%) had abdominal pain. The pancreatitis was associated with biliary disease in 10 patients (20%); it was due to viral infection in 6 patients (12%), pancreatic duct abnormalities in 4 (8%), familial chronic pancreatitis in 3 (6%), trauma in 5 (10%) and other causes in 5 (10%); the pancreatitis was of unknown ori…

Future language teachers’ pedagogical landscapes during their subject studies

2015

This article examines the experiences, attitudes and perceptions language students have regarding the use of ICT in language teaching. In addition, the article analyses the key characteristics of language students’ pedagogical designs. The data come from a pedagogically oriented subject-studies course that focuses on the Common European Framework of Reference for Languages and the European Language Portfolio. The data, which consist of language students’ reflections and course plans, have been analysed using qualitative content analysis. The findings imply that language students’ pedagogical landscapes reflect their own experiences as learners. Furthermore, the literacy practices in languag…

Análisis de la producción y el consumo de información en los artículos españoles sobre bibliometría

1996

We analyze Spanish production of papers on bibliometrics published in Spanish scientific journals and the use of information through the method of bibliographic reference analysis. Publications have been obtained from IME, ICYT and ISOC databases. The number of papers was 101 , with 1848 citations. The most important citations are to journal articles and Spanish publications, but <i>Scientometrics</i> is the most cited journal. Results seem to show that bibliometrics is a young discipline in our country, with an important role of classic authors. Difficulties of access to foreign bibliography produce a high use of Spanish publications. Medicine and Psychology are the most influe…

Efficacy of intra-arterial lidocaine infusion in the treatment of cerulein-induced acute pancreatitis

2020

Background Disturbances in pancreatic microcirculation, beginning with vasoconstriction, are crucial in early pancreatitis and progression to necrotizing pancreatitis. Thus, vascular-targeted treatment aiming to restore a sufficient level of microcirculation through vasodilation would possibly reduce the severity of pancreatitis. Lidocaine is an anti-arrhythmic and local anesthetic drug, which also acts as a vasodilator at higher concentrations. Objectives To evaluate the efficacy of intra-arterial infusion of lidocaine into the celiac trunk in treatment of cerulein-induced acute pancreatitis. Material and methods Wistar rats (n = 20) were randomly divided into 2 equal groups: the control g…

Interaction of Language Policy and Assessment in Finland

2008

This paper reviews developments and future challenges in language policy, planning and assessment in Finland, where several important changes in legislation, curricula and assessment systems have recently taken place. Language proficiency requirement of immigrants and civil servants have been redefined, school curricula have been revised and new language examinations have been developed. The Common European Framework has been particularly influential. The paper also explores the tensions caused by changes, such as uncertainties in implementing new curricula in teaching and assessment, and differences between curricula and national examinations. The gate-keeping function of examinations also…