Search results for " quality."
showing 10 items of 2995 documents
Incentives, Service Quality, and Regulation: An Application to the Airline Industry
2012
El sector aéreo presenta interesantes retos para el investigador. Se trata de un sector complicado debido, entre otras características, a las siguientes: escasos márgenes de beneficios, elevadas barreras de entrada y salida, alta sensibilidad a ciclos económicos, y la regulación y competencia. Desde los años 90, Europa ha vivido un proceso de desregulación en el tráfico aéreo. Ello ha supuesto una reorganización de las redes desde rutas completamente conectadas (fully-connected) hacia redes con aeropuertos base (hub-and-spoke). No debemos olvidar que sobreviven mercados que están regulados de acuerdo con la calificación de “obligación de servicio público” – en España tenemos el caso de las …
Lignin and Cellulose Content of Fermented Rice Straw with Aspergillus niger (van Tieghem) and Trichoderma mutan AA1
2021
The rice straw has potential to be used as an alternative ruminant feed. However, it has limiting factors i.e low crude protein, high crude fiber, lignin, cellulose, and silica content. To overcome the limiting factors, immersion in a solution of alkaline (lime) or fermentation by using inoculum microbial cellulolytic and lignocellulolytic (Trichoderma mutan AA1 and Aspergillus niger.). The research method was experimental, with four treatments and repeated five times. Completely randomized design was used and if there are differences among treatments a further test with DMRT was carried out (level 1 % and 5 %). These treatments were T0: The rice straw without t fermentation; T1: Fermented …
INFORMATION QUALITY PROBLEMS ON WEBSITES
2019
The goal of this publication is to identify and characterize the typical problems with information quality on websites, and to present exemplary remedies for those problems. In this article the information quality problems within their origins, as well as the consequences of using poor-quality information by the Internet user were defined. There were also presented ways of improving information quality - which should facilitate the information needed by producers/authors and the managers/administrators of services in or to find solutions to the remaining problems. The presented varied remedies are not all possible solutions to improving quality in the area of the WWW content and its infrast…
Information quality evaluation methodology for web page directories
2016
The article presents information quality evaluation methodology for websites directories. In the first part of the article the theoretical basis for website directories was presented (ways of information acquisition, classification and issues relating to quality of websites). The second part of the article was devoted to the research methodology for evaluating quality of information collected in website directories. The identification of quality characteristics carried out shall allow for evaluating quality of general information and of information in thematic directories on web pages. The article ends with a summary containing conclusions and guidelines for further research directions.
MOESM4 of Leaps and bounds: geographical and ecological distance constrained the colonisation of the Afrotemperate by Erica
2019
Additional file 4. Methods: Selected bootstrap trees used to represent phylogenetic uncertainty between geographically restricted major clades.
Inositol supplementation and IVF outcome: preliminary data
2012
Myo-Inositol (MI) is involved in several aspects of human reproduction. Elevated concentrations of myo-inositol in human follicular fluids, in fact, seem to play a positive role in follicular maturity, since to represent a possible marker of good oocyte quality. Nevertheless its positive role in PCOS patients is a consequence of a defect in the insulin signaling (inositol- containing phosphoglycan mediators) pathway that seems to be implicated in the pathogenesis of insulin resistance. The aim of this study was to analyze the effect of myo-inositol supplementation to “standard” therapy in PCOS women and in “poor responders”, submitted to In Vitro Fecundation (IVF) cycles. In particular, we …
Metrological performances of voltage and current instrument transformers in harmonics measurements
2018
In the new electrical system scenario, the increasing presence of non-linear loads and renewable energy sources makes the measurement of harmonics an essential task. The accuracy of harmonic measurement firstly depends on the used instrument transformers for voltage and current sensing. Since the behavior of instrument transformers in non-sinusoidal conditions is not always well defined, this paper presents an experimental study on the metrological performances of current and voltage instrument transformers (CTs and VTs) in the presence of harmonics. Proper tests procedures are defined and measurement setups are developed for both CTs and VTs calibration. The analysis is carried out by usin…
Comparison between a detailed and a simplified integrated model for the assessment of urban drainage environmental impact on an ephemeral river
2008
The benefit of integrated analysis has been demonstrated in technical literature and it is also required by the EU Water Framework Directive 60/2000, which proposes a water-quality-orientated view of the whole urban drainage system and oversees new ways of assessing its performance. Integrated models, such as any complex modelling approach, often have prohibitive data availability requirements that reduce their applicability. Moreover, widely different approaches can be applied, ranging from simple conceptual models to complex physically based ones. In the present paper, two approaches have been compared using data from an experimental catchment in Bologna ( Italy), which consists of a part…
Monitoring and data quality assessment of the ATLAS liquid argon calorimeter
2014
The liquid argon calorimeter is a key component of the ATLAS detector installed at the CERN Large Hadron Collider. The primary purpose of this calorimeter is the measurement of electron and photon kinematic properties. It also provides a crucial input for measuring jets and missing transverse momentum. An advanced data monitoring procedure was designed to quickly identify issues that would affect detector performance and ensure that only the best quality data are used for physics analysis. This article presents the validation procedure developed during the 2011 and 2012 LHC data-taking periods, in which more than 98% of the proton-proton luminosity recorded by ATLAS at a centre-of-mass ener…
Distribution and generation of traps in SiO2/Al2O3 gate stacks
2007
In this work we combine charge-pumping measurements with positive constant voltage stress to investigate trap generation in SiO2/ Al2O3 n-MOSFET. Trap density has been scanned either in energy or in position based on charge-pumping (CP) measurements performed under different operating conditions in terms of amplitude and frequency of the gate pulse. Our results have revealed that the traps are meanly localized shallow in energy level, deeper in spatial position and they are mostly generated near the Si/SiO2 interface. (C) 2007 Elsevier Ltd. All rights reserved.