Search results for " glass"
showing 10 items of 409 documents
Biological characterization of Poly-L-lactic acid (PLLA)/Hydroxyapatite (HA)/Bioglass (BG) composite scaffolds made by Thermally Induced Phase Separa…
In the last few years, Tissue Engineering has focused on the favourable effects that composite scaffolds have on cell adhesion, growth and differentiation. In fact, composite scaffolds, usually composed of a synthetic polymer supplemented with naturally occurring components, display superior mechanical properties and bioconductivity than scaffolds consisting of a single component. Hydroxyapatite (HA) is the major inorganic component of bones. Bioglass (BG) is known to exert stimulatory effects on cells by ion release and hence, could be also advantageous for Bone Tissue Engineering. Poly-L-lactic acid (PLLA) is a versatile synthetic polymer combinable with HA and BG. The aim of this work wa…
Photocatalytic degradation of 4-nitrophenol in a continuous reactor containing titanium dioxide supported on glass beads
2008
WOS: 000258975200009
L'altro Novecento. Il minimalismo nella musica del nostro tempo
2005
Il termine "minimalismo" si diffonde nel lessico della critica d'arte fin dall'inizio degli anni Trenta, ma è divenuto oggi sinonimo di linearità e rigore negli ambiti dell'architettura, delle arti figurative e della musica, ma anche nei mondi paralleli della moda, della pubblicità e del design. Assumendo l'idea del rapporto fra "ornamento e delitto" come fil rouge che attraversa il Novecento e congliunge, nel segno di un'ascetica ricerca dell'essenza, le forme primordiali di Brancusi e gli aforismi di Anton Webern alle grandi sculture inespressive di Morris e Judd e al teatro di Robert Wilson, il volume è costituito da otto capitoli/saggi che si configurano come altrettante riflessioni sul…
Il controllo dell’employer branding nello spazio pubblico in rete
2017
Obiettivo di questo articolo è comprendere in che misura l’Employer Branding (EB) esprima un’autentica realtà aziendale oppure sia solo una ben orchestrata suggestione organizzativa. Dopo averne riscostruito il significato e l’impatto sul ciclo di gestione delle risorse umane (recruitment, commitment e retention), lo studio descrive tre modalità di controllo dell’EB: il controllo interno, professionale e pubblico. Le caratteristiche e le implicazioni critiche di un caso di controllo pubblico dell’EB quale Glassdoor.com vengono presentate. In particolare vengono illustrati la struttura, i servizi e le criticità della piattaforma crowdsourcing-based di Glassdoor.com (usi ritorsivo, scorretto,…
Appearance or reality? Monitoring of employer branding in public network space: the Glassdoor case
2017
To what extent does Employer Branding (EB) express the real‐life company working environment or merely constitutes a well‐orchestrated organizational image? After reconstructing its significance and impact on the managing of the human resource cycle (recruitment, commitment, and retention) this study describes three ways of monitoring EB: internal, professional and public control. They each make use of a variety of tools in order to assess the extent to which the appearance of the employer corresponds to an authentic reality. Then, there is a presentation of the features and critical issues of a case of public EB control: Glassdoor.com. More specifically, this is followed by descriptions of…
Women e-participation: glass ceiling decrease?
2012
This paper aims to review useful theoretical frame work able to encapsulate new frontiers of research on women political participation. In particular based on the feminist dichotomy of public and private sphere it investigates how Internet can enrol women in solving glass ceiling in political activism and participation considering its grassroots networked nature.
Shear elasticity of mixed cyanide orientational glass
1993
Four mixed crystals of KBr:KCN and NaCN:KCN, complemented by KCN, have been investigated by torque-shear measurements. The real and imaginary parts of the shear compliance ${\mathit{s}}_{44}$ at a measuring frequency of 2 Hz have been determined. Zero-field-cooling--field-cooling--remanent-shear-strain cycles have been performed. For (KBr${)}_{0.47}$(KCN${)}_{0.53}$ the creep after zero-field cooling and the elastic aftereffect after field cooling have been followed within a time window from 0.1 to ${10}^{4}$ s. Results on the nonlinear part of the shear compliance have been obtained. It is shown that the field-cooled strain represents the static limit of the elastic response. The results a…
Raman spectroscopy study of β-irradiated silica glass
2003
International audience; Natural and synthetic silica glass samples with different OH content have been submitted to β-irradiation at different doses from 106 to 5 × 109 Gy in a Van de Graaff accelerator. Structural changes under irradiation have been analyzed by Raman spectroscopy. The main findings are: (i) a decrease of the Si–O–Si angular dispersion and the average Si–O–Si angle as a function of dose and (ii) an increase of number of three-membered SiO4 ring concentration during irradiation. These results show therefore that purely electronic excitation from β-irradiation induces in a-SiO2 small but significant structural changes of the SiO4 membered ring statistics (size and dispersion)…
Baseline design of the filters for the LAD detector on board LOFT
2014
The Large Observatory for X-ray Timing (LOFT) was one of the M3 missions selected for the phase A study in the ESA's Cosmic Vision program. LOFT is designed to perform high-time-resolution X-ray observations of black holes and neutron stars. The main instrument on the LOFT payload is the Large Area Detector (LAD), a collimated experiment with a nominal effective area of ~10 m 2 @ 8 keV, and a spectral resolution of ~240 eV in the energy band 2-30 keV. These performances are achieved covering a large collecting area with more than 2000 large-area Silicon Drift Detectors (SDDs) each one coupled to a collimator based on lead-glass micro-channel plates. In order to reduce the thermal load onto …
Float glass colouring by ion exchange
2008
Abstract Back in the Middle Ages, glass artists used to produce yellowish colorations in soda-lime glasses using mixtures that contained silver salts, clay composites and natural oils. The resulting colour was a characteristic pale yellow known as silver-stain. This coloration is mainly caused by the extinction – absorption and, to a lesser extent, scattering – of light occasioned by silver nanoparticles formed inside the glass. This colouring technique comprises a heat treatment divided in two stages: in the first one, an ion exchange between the silver ions in the mixture and the alkali ions in the glass takes place. This process is called nucleation of silver nanoparticles. The second st…