1. Online Portal - Nevada Department of Education
OPAL: Apply For a License or Endorsem*nt · OPAL Instructions for Registration. New and existing licensees must register themselves and use OPAL to update ...
A: You must create an account and submit the electronic application. As of July 1, 2018, the NDE no longer accepts paper applications. If you submit an old paper application, it will be returned back to you along with any documents you provided and this will delay your application for licensure significantly.
2. [PDF] Online Portal for Applications and Licensure - CCEA
OPAL - Nevada Department of Education License renewal website. OPAL is available to all educators by copying and pasting the following URL: https://online ...
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4. Opal: an open source ray-tracing propagation simulator for ... - HAL
In this paper we present Opal, an electromagnetic propagation simulation tool implemented with ray-tracing on graphical processing units, which is part of the ...
Accurate characterization and simulation of electromagnetic propagation can be obtained by ray-tracing methods, which are based on a high frequency approximation to the Maxwell equations and describe the propagating field as a set of propagating rays, reflecting, diffracting and scattering over environment elements. However, this approach has been usually too computationally costly to be used in large and dynamic scenarios, but this situation is changing thanks the increasing availability of efficient ray-tracing libraries for graphical processing units. In this paper we present Opal, an electromagnetic propagation simulation tool implemented with ray-tracing on graphical processing units, which is part of the Veneris framework. Opal can be used as a stand-alone ray-tracing simulator, but its main strength lies in its integration with the game engine, which allows to generate customized 3D environments quickly and intuitively. We describe its most relevant features and provide implementation details, highlighting the different simulation types it supports and its extension possibilites. We provide application examples and validate the simulation on demanding scenarios, such as tunnels, where we compare the results with theoretical solutions and further discuss the tradeoffs between the simulation types and its performance.
5. Cinnabar Inclusions in Ethiopian Opal - MIOPS - DUMAS
The authors recently examined a 15.8 ct Ethiopian opal (Figure 4) that contained numerous red dendritic particles that each ... CCSD. CCSD · Episciences ...
The authors recently examined a 15.8 ct Ethiopian opal (Figure 4) that contained numerous red dendritic particles that each measured up to 70-100 μm in diameter (Figure 5). The Ethiopian origin of the opal was confirmed by its physical properties (slight hydrophane character and rounded columnar structure) and its chemical composition (high Ba concentration; Rondeau et al. 2010). The inclusions were identified by Raman microspectroscopy as cinnabar (HgS). Energy-dispersive X-ray fluorescence (EDXRF) chemical analyses of the top surface of the sample confirmed the presence of Hg and S. Cinnabar and opal are associated in numerous localities, particularly in the western USA (Knopf 1915; Gettens et al. 1972; https://www.mindat.org/min-3004. html). However, cinnabar is only rarely mentioned as inclusions in opal (see, e.g., Gaillou 2015). Also known is an opalised or silicified cinnabar material known as myrickite, in which the high concentration of cinnabar inclusions induces an intense orange or red colour (Manutchehr-Danai 2009; Melero et al. 2019). To the authors' knowledge, this is the first time that cinnabar inclusions have been documented in opal from Ethiopia. Their dendritic habit suggests relatively fast growth, whereas magnetite inclusions reported in Ethiopian opal have a well-formed octahedral habit (Rondeau et al. 2010), suggesting slow growth. This points to a vast domain of parameters possible (at least in terms of growth rate and chemistry) for the formation of...
6. The opal-CT nanostructure. - MNHN - Muséum national d'Histoire naturelle
Opal-CT, a silica polymorph in marine sedimentary siliceous rocks, exhibits commonly a form of spheres about ten micrometers in diameter ("lepispheres").
Opal-CT, a silica polymorph in marine sedimentary siliceous rocks, exhibits commonly a form of spheres about ten micrometers in diameter ("lepispheres"). Quantitative infrared analyses were performed with a special attention to the band related to the SieOeSi angle and to the [SiO 4 ] tetrahedral framework. Opal-CT includes about 40% non-crystalline structures mixed with crystalline ones related to tridymite. Under TEM a single opal-CT lepisphere section exhibits a nanostructure constituted of a stacking of domains 1.5 nm thick, alternatively crystalline and non-crystalline. The crystalline domains match with a monoclinic form of tridymite which pass to non-crystalline domains with a distortion of the SieOeSi angle. The regular stacking of crystallites 1.5 nm thick composed with about three tridymite modules is assigned to a tridymite superstructure. The paradoxical crys-tallization at sea water temperature of a high temperature mineral is here explained by the polymerization of silica dimers from sea water enriched with dissolved silica. Opal-CT hydrothermal in origin differs from the sedimentary one by its infrared spectrum and its optical properties that matches with the silica polymorph lussatite. It is inferred that the hydrothermal opal-CT exhibits a structure significantly different from the sedi-mentary one (pseudo-orthorhombic, even orthorhombic).
7. Contribution of changes in opal productivity and nutrient distribution ...
Contribution of changes in opal productivity and nutrient distribution in the coastal upwelling systems to late Pliocene/early Pleistocene climate cooling.
International audience The global late Pliocene/early Pleistocene cooling (~3.0-2.0 million years ago, Ma) concurred with extremely high diatom and biogenic opal production in most of the major coastal upwelling regions. This phenomenon was particularly pronounced in the Benguela Upwelling System (B...
8. Whitening of fire opal: Transformation of silica in soils - PMN - DUMAS
We hypothesized that "zoned opals" are a transitional state between orange and white opal due to a progressive and centripetal transformation caused by fluids ...
Of all the world's gem opal deposits, Ethiopian's ones stand out for their quantitative production of white opals and orange fire opals. They also provide a significantly amount of intriguing specimens displaying a translucent, porous, white periphery covering a transparent, massive, orange core. These "zoned opals" are stable (they do not evolve with time after mining) and are only encountered in Ethiopia thus far. This suggest that the envi-ronment of formation and residence of opals, attributed to pedogenetic processes in a strongly weathered environment, play an important role in the formation of those specimens. We hypothesized that "zoned opals" are a transitional state between orange and white opal due to a progressive and centripetal transformation caused by fluids in the soil. First, we document the properties of zoned opals for the first time and compare them to entirely orange opals from Ethiopia (Wegel Tena and Mezezo) and Mexico, by multi-scale techniques: UV-visible absorption spectrometry, Raman spectroscopy, LA-ICP-MS, Atomic Force Microscopy and Scanning Electron Microscopy. White periphery proved to be more porous, depleted in iron, and structurally more polymerized compared to the orange cores. Second, we conduct experimental modeling of the "external whitening" phe-nomenon as it could occur in a pedogenetic environment rich in both organic and inorganic fluids. For that, we submitted orange opals to various solutions of reactants naturally occurring in soi...
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New and existing licensees must register themselves and use OPAL by going ... Everything uploaded into OPAL must be in the form of a scanned PDF document.
