Search results for "glasses"

Montatura polifunzionale per occhiali

2018

La presente invenzione ha come oggetto una montatura polifunzionale per occhiali, del tipo che consente la rapida sostituzione delle parti che la compongono. Tutti i componenti sono realizzabili con stampa ad iniezione, processo che ne rende i costi di produzione estremamente contenuti. L'assemblaggio avviene senza uso di viti o perni metallici. The present invention has as its object a multifunctional frame for eyeglasses, of the type which allows the rapid replacement of the parts that compose it. All components can be produced with injection molding, a process that makes production costs extremely low. Assembly is carried out without using screws or metal pins.

Dallo chignon ai capelli sciolti. Stereotipie delle bibliotecarie tra primo e secondo Novecento

2021

The essay focuses on the main stereotypes that have characterized the way of representing the figure of the librarian starting from classic American cinema. Hair gathered in a chignon, shirt buttoned at the neck, glasses, are elements that make the surly, solitary, shy and rude librarians easily recognizable who find their climax in the figure of Miss Anderson in Citizen Kane. In the second half of the twentieth century, however, a radical change took place in the stereotypical representation of this figure and the chignon was replaced by loose hair and the character of the harsh woman gave way to that of the sexy icon.

Several Derivatives of 6-(Tert-Butyl)-4H-Pyran-4-Ylidene Malononitrile with Different Amorphous Phase Promoting Substituents for Light-Amplification …

2019

A series of glassy 6-(tert-butyl)-4H-pyran-4-ylidene malononitrile (DCM) derivatives with covalently attached amorphous state promoting bulky 1,1,1-triphenylmethyl (trityl) moieties through several chemical design approaches have been synthesized and investigated for suitability in organic solid state laser applications. Results showed that the bonding type of such functional groups had a considerable influence on glass structure forming dye thermal properties and a slight influence on their optical properties. Thermal stability up to 346 °C was achieved with glass transitions in the range from 39 to 138 °C. Incorporation of bulky triphenyl substituents via ester groups showed remarkable am…

TL dose reconstruction in watch glasses exposed to photon, electron and proton beams

2010

Direct Writing on Copper Ion Doped Silica Films by Electrogeneration of Metallic Microstructures

2017

International audience; A facile and rapid localized electrochemical reduction of colloid copper particles is proposed using the scanning electrochemical,microscope (SECM), technique. In this purpose, thin films of composite silica :glass containing copper salts were prepared by the sol-gel method via the dip coating technique. Acid-catalyzed tetraethylorthosilane (TEOS) solutions charged with copper nitrate were used as precursors. This one-pot experiment can be performed in mild conditions. The localized generation of copper metallic nanostructures on silica film has been performed by electroreduction of methyl viologen on an ultramicroelectrode (UME). The UME generates reducing species, …

XANES and EXAFS modelling of configurational disorder in silver borate glasses

2005

The sensitivity of X-ray absorption spectroscopy (XAS) to the local structure around a selected atomic species (symmetry, distances and angles) is commonly exploited to quantitatively describe systems where all the configurations around the absorbing atoms may be approximated by the mean one. However, in many cases of disordered systems a simple description of the local structure with singleconfiguration models cannot be reconciled with experimental spectra. In this paper the necessity to analyse the XAS spectra by considering a multiplicity of atomic structural configurations is demonstrated in the case of silver borate glasses. The local coordination around Ag cations in (Ag2O.nB2O3) glas…

An improved molecular design of obtaining NLO active molecular glasses using triphenyl moieties as amorphous phase formation enhancers

2012

New molecular design of obtaining molecular glasses has been developed by linking triphenylmethyl moieties to chromophore core by flexible C-C bridge. Compounds capable of forming stable amorphous phase with good optical quality have been acquired with increased chemical and thermal sustainability compared to the previously reported design. NLO activity of compounds has been measured after corona discharge polling. Compared to previously synthesized trityloxy fragment containing compounds increase of d 33 coefficient by up to 17 times was achieved for the same chromophore core containing compounds.

E. Leitz palielināmais stikls uz statīva

2020

Raksts par palielināmajiem stikliem, mikroskopiem un optisko instrumentu ražošanas uzņēmumu "Ernst Leitz Wetzlar", kura ražotais vienkāršais sadalīšanas mikroskops nr. 46 atrodas Latvijas Universitātes Muzeja Botānikas un mikoloģijas kolekciju krājumā.

Cognitive demands impair postural control in developmental dyslexia: A negative effect that can be compensated

2009

Children with developmental dyslexia exhibit delayed reading abilities and various sensori-motor deficits. The way these various symptoms interact remain poorly understood. The objective of this study was twofold. First, we aimed to investigate whether postural control was impaired in dyslexic children when cognitive demands are increased. Second, we checked whether this effect could be reduced significantly by a treatment aiming to recalibrate ocular proprioception. Twelve dyslexic and fifteen treated dyslexic children (>3 months of treatment) were compared with twelve non-dyslexic children in two conditions (mean age: 11.6 ± 2.1, 12.5 ± 1.5 and 10.6 ± 1.7 years respectively). In a first c…

Scanning Tunneling Spectroscope Use in Electrocatalysis Testing

2010

Published version of an article from the journal: Materials (1996-1944). Also available from publisher: http://dx.doi.org/10.3390/ma3063675 The relationship between the electrocatalytic properties of an electrode and its ability to transfer electrons between the electrode and a metallic tip in a scanning tunneling microscope (STM) is investigated. The alkaline oxygen evolution reaction (OER) was used as a test reaction with four different metallic glasses, Ni78Si8B14, Ni70Mo20Si5B5, Ni58Co20Si10B12, and Ni25Co50Si15B10, as electrodes. The electrocatalytic properties of the electrodes were determined. The electrode surfaces were then investigated with an STM. A clear relationship between the…