Search results for "Row"
showing 10 items of 9311 documents
Formation of nanosized strontium substituted hydroxyapatites
2012
Incorporation of specific elements into calcium phosphates offers the combination of a bioactive material and a therapeutic effect. This is important for improving the integration of implants as well as treating medical conditions. Strontium is a suitable candidate and displays the ability to stimulate bone growth and reducing bone resorption. This study investigated the formation of strontium carbonated hydroxyapatite nanoparticles from an amorphous phase. Crystallization of carbonated hydroxyapatite occurred at 585 o C, but samples with an intended 25% and 75% replacement of calcium with strontium crystallized at 624 o C. Heat treatment at the crystallization temperature revealed that str…
Effective Recovery Process of Copper from Waste Printed Circuit Boards Utilizing Recycling of Leachate
2020
AbstractThis study presents an optimized leaching and electrowinning process for the recovery of copper from waste printed circuit boards including studies of chemical consumption and recirculation of leachate. Optimization of leaching was performed using response surface methodology in diluted sulfuric acid and hydrogen peroxide media. Optimum leaching conditions for copper were found by using 3.6 mol L−1 sulfuric acid, 6 vol.% hydrogen peroxide, pulp density of 75 g L−1 with 186 min leaching time at 20°C resulting in complete leaching of copper followed by over 92% recovery and purity of 99.9% in the electrowinning. Study of chemical consumption showed total decomposition of hydrogen pero…
Les formations professionnelles de l'enseignement supérieur en France au prisme de l'insertion et de la mobilité sociale des diplômés
2014
La professionnalisation des formations dans l'enseignement supérieur en France s'est développée ces dernières décennies avec pour objectif d'améliorer l'employabilité des jeunes diplômés dans un contexte de dégradation de leurs conditions d'insertion. À partir des trois dernières enquêtes Génération du Céreq, ce travail questionne la performance de ces filières professionnelles par rapport aux filières plus académiques de l'enseignement supérieur, en période de crise économique. Certaines formations, comme par exemple les licences professionnelles, garantissent toujours de bonnes conditions d'insertion, pour autant les effets concernant la mobilité sociale en début de carrière, sont plus nu…
Institutional entrepreneurs: The driving force in institutionalization of public systems in developing countries
2013
PurposeWhile institutional theory is used widely in the information system (IS) literature to study implementation of systems, the actual process of institutionalization has received less attention. The purpose of this paper is to address this gap in the literature by using three concepts drawn from the theory, namely, institutional isomorphism, institutional logic and institutional entrepreneurship, and the interplay between them to explore the role of the dominant institutional entrepreneur in the institutionalization of a public system, as an instance of e‐government initiatives.Design/methodology/approachIn an interpretive case study, this study examined the institutionalization process…
On the Fast and Rigorous Analysis of Compensated Waveguide Junctions Using Off-Centered Partial-Height Metallic Posts
2007
In this paper, we present an efficient and rigorous method, based on the 3-D boundary integral-resonant-mode expansion technique, for the analysis of multiport rectangular waveguide junctions compensated with partial-height cylindrical metallic posts. The electrical performance of a great variety of commonly used wideband microwave circuits has been improved drastically thanks to the introduction of a new design parameter, i.e., the relative position of the metallic post in the structure. To the authors' knowledge, this parameter has not been taken into account in previous studies concerning compensated junctions using partial-height metallic posts. The developed tool has been successfully …
The Concept of Integrated Profit From Contractual Relationship. The Case of Transactions Between Agricultural Producers’ Groups And Agri-Food Sector
2017
Koncepcja zintegrowanej korzyści umożliwia holistyczną analizę celów realizowanych w ramach kontraktów między rolnikami lub organizacjami producentów rolnych a rynkiem przetwórstwa rolno-spożywczego. Wykorzystanym podejściem była teoria kontraktów. Jako cel główny artykułu przyjęto identyfikację form pionowej koordynacji transakcji między grupami producentów rolnych a rynkiem rolno-spożywczym. Celem szczegółowym było zaś rozpoznanie mechanizmu cenowego w umowach i analiza przy wykorzystaniu koncepcji zintegrowanej korzyści (rozważania zawężono do obszaru koordynacji). Przedmiotem badań były kontrakty podpisane w 2014 roku między grupami producentów działającymi na rynku drobiu a pierwszym o…
Integrated Urban Regeneration – Solution for Cities Revitalize
2013
Abstract To overcome the crisis which present society faces, it's necessary find solutions, adopt new strategies, leading to transforming too and revitalizing urban areas. Urban regeneration means the improvement the quality of life and investing in the future, this action being a very broad one, continues, difficult, but not impossible, in any case imperative.This paper presents the results of a study on integrated sustainable urban regeneration in several European countries, including Romania, and comparison between these countries in terms of urban regeneration.
Mixed Epidermal Cell Lymphocyte Reaction: HLA-DR+ Cells Exhibit a Greater Immunostimulatory Activity than CD1a+ Cells
1995
Induction and expression of immunity depends upon processing and presentation of antigens to T-cells by bone marrow derived HLA-DR+ antigen presenting cells (APC). In the induction of immunity to cutaneous antigens, the initial stages of this process begin within the skin itself, and both epidermis and dermis contain bone-marrow derived cells that have the capability of processing and presenting antigens. In normal epidermis, HLA-DR expression is believed to be confined to Langerhans cells with Birbeck granules and indeterminate cells without Birbeck granules. In diseased skin, particularly the inflammatory dermatoses, HLA-DR is commonly expressed by keratinocytes and has been related to th…
Intercultural and global dimension of textbooks – points of consideration for language teachers
2019
Biorąc pod uwagę, iż nauka języka obcego jest potencjalnie związana z kształtowaniem kompetencji globalnych i międzykulturowych, celem niniejszego artykułu jest krytyczna analiza treści związanych z różnorodnością kulturową zawartych w podręcznikach używanych do nauki języka angielskiego. Rama teoretyczna analizy jest oparta na wybranych aspektach programu ukrytego, edukacji globalnej i międzykulturowej oraz związkach między nimi a nauką języka angielskiego. Jakościowe badanie treści podręczników pozwoliło autorkom zidentyfikować główne tematy związane z różnorodnością etniczną, określone jako petrification (petryfikacja), exotization (egzotyzacja) oraz povertization (ukazywanie osób i grup…
Simulation of Fatigue Delamination Growth in Composites with Different Mode Mixtures
2007
A numerical model, obtained by implementing a cyclic damage model in the framework of an interface element, is here proposed to reproduce the crack growth in laminated composites subjected to cyclically repeated loads. This model, which differs from the few studies in the literature on the topic, applies not only to single fracture modes but also to mixed modes, and to constant or variable crack growth rates. The applied load (in terms of force or displacement) is assumed to oscillate between a minimum and a maximum constant value. The Paris curve can be reproduced with accuracy once some parameters in the numerical model are tuned with experiments. These parameters are preliminarily found…