1 resultado para Standarization of the system
em Greenwich Academic Literature Archive - UK
Filtro por publicador
- Aberystwyth University Repository - Reino Unido (3)
- AMS Tesi di Dottorato - Alm@DL - Università di Bologna (2)
- AMS Tesi di Laurea - Alm@DL - Università di Bologna (2)
- Aquatic Commons (34)
- ArchiMeD - Elektronische Publikationen der Universität Mainz - Alemanha (2)
- Archive of European Integration (52)
- Archivo Digital para la Docencia y la Investigación - Repositorio Institucional de la Universidad del País Vasco (6)
- Aston University Research Archive (9)
- Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (9)
- Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (BDPI/USP) (3)
- BORIS: Bern Open Repository and Information System - Berna - Suiça (8)
- Boston University Digital Common (2)
- Brock University, Canada (18)
- Bucknell University Digital Commons - Pensilvania - USA (1)
- Bulgarian Digital Mathematics Library at IMI-BAS (6)
- CaltechTHESIS (6)
- Cambridge University Engineering Department Publications Database (57)
- CentAUR: Central Archive University of Reading - UK (24)
- Chinese Academy of Sciences Institutional Repositories Grid Portal (90)
- Cochin University of Science & Technology (CUSAT), India (10)
- Comissão Econômica para a América Latina e o Caribe (CEPAL) (11)
- CORA - Cork Open Research Archive - University College Cork - Ireland (7)
- Corvinus Research Archive - The institutional repository for the Corvinus University of Budapest (3)
- Dalarna University College Electronic Archive (2)
- Deakin Research Online - Australia (7)
- DI-fusion - The institutional repository of Université Libre de Bruxelles (3)
- Digital Archives@Colby (1)
- Digital Commons - Michigan Tech (2)
- Digital Commons - Montana Tech (2)
- Digital Commons at Florida International University (3)
- DigitalCommons@The Texas Medical Center (3)
- Duke University (3)
- eResearch Archive - Queensland Department of Agriculture; Fisheries and Forestry (5)
- Glasgow Theses Service (1)
- Greenwich Academic Literature Archive - UK (1)
- Helda - Digital Repository of University of Helsinki (16)
- Illinois Digital Environment for Access to Learning and Scholarship Repository (1)
- Indian Institute of Science - Bangalore - Índia (136)
- Instituto Politécnico do Porto, Portugal (7)
- Ministerio de Cultura, Spain (3)
- National Center for Biotechnology Information - NCBI (1)
- Nottingham eTheses (1)
- Plymouth Marine Science Electronic Archive (PlyMSEA) (22)
- Portal de Revistas Científicas Complutenses - Espanha (1)
- Publishing Network for Geoscientific & Environmental Data (1)
- QSpace: Queen's University - Canada (1)
- QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (157)
- Queensland University of Technology - ePrints Archive (105)
- Repositório digital da Fundação Getúlio Vargas - FGV (1)
- Repositório Institucional UNESP - Universidade Estadual Paulista "Julio de Mesquita Filho" (37)
- Research Open Access Repository of the University of East London. (1)
- RUN (Repositório da Universidade Nova de Lisboa) - FCT (Faculdade de Cienecias e Technologia), Universidade Nova de Lisboa (UNL), Portugal (2)
- School of Medicine, Washington University, United States (3)
- Universidad Autónoma de Nuevo León, Mexico (2)
- Universidad de Alicante (3)
- Universidad del Rosario, Colombia (3)
- Universidad Politécnica de Madrid (11)
- Universidade Federal do Pará (1)
- Universitat de Girona, Spain (1)
- Universitätsbibliothek Kassel, Universität Kassel, Germany (7)
- Université de Lausanne, Switzerland (7)
- Université de Montréal, Canada (9)
- University of Michigan (27)
- University of Queensland eSpace - Australia (5)
- University of Southampton, United Kingdom (1)
- WestminsterResearch - UK (2)
- Worcester Research and Publications - Worcester Research and Publications - UK (1)
Resumo:
Gel-derived CaO-SiO2 binary glasses of CaO mole fractions 0. 2, 0.3 and 0. 4 have been prepared and characterised. Pore diameter specific pore volume, skeletal density and porosity were found to increase with increasing CaO-content, whereas a concomitant decrease in specific surface area was observed. Si-29 NMR indicated that the 0.2 CaO mole fraction glass consisted of higly polymerized Q(4) and Q(3) silicate species, with some Q(2) units. With increasing CaO mole fraction, these silicate species became progressively depolymerised such that isolated SiO4 tetrahedra were detected within the 0.4 CaO glass matrix. Unusually, the glasses retained a proportion of Q(4) and Q(3) species as the CaO mole fraction was increased. All glass formulations exhibited in vitro bioactivity. The rate of hydroxyapatite precipitation followed the order 0.2 CaO > 0.4 CaO > > 0.3 CaO, an effect that is attributed to differences in the rate of dissolution of calcium from these glasses. This, in turn, appears to be dependent upon the proportion of Ca 21 participating in the formation of the glassy network.