Search results for " Dio"
showing 10 items of 1714 documents
Thermomineral waters of Greece: geochemical characterization
2020
Derecho y conciencia en Antígona: Una respuesta atemporal a los conflictos de familia
2018
El presente artículo aborda la importancia de la familia en Antígona, de Sófocles. Ante el Decreto de Creonte, por el que se prohibía, bajo pena de muerte, enterrar y llorar a Polinices, su hermana ?Antígona ? no duda en afirmar que por encima de las leyes del Estado está la ley de los dioses y la ley que dicta su conciencia, la que le exige anteponer los lazos familiares al orden público. Un acto de desobediencia civil que le conducirá a muerte.
Hybrid perovskites for light-emitting and photovoltaic devices
2017
El objetivo de esta tesis es el desarrollo de métodos y materiales apropiados para la preparación de capas delgadas de perovskitas híbridas, y su implementación en dispositivos optoelectrónicos. Se dedicará particular atención a las relaciones entre la naturaleza del material, el método de deposición y las propiedades optoelectrónicas. El trabajo está organizado como sigue: - Células solares de perovskitas preparadas por evaporación flash. Se desarrolla un simple método de evaporación por la preparación de células solares. - Dispositivos de perovskita con alta eficiencia fotovoltaica y electroluminiscente. En este capítulo se presentan dispositivos optoelectrónicos de perovskitas preparados…
Адсорбционные свойства диоксидномарганцевого электрода в водных растворах
1990
Advisor: Пурин, Бруно Андреевич ; Слайдинь, Гунар Янович ; Восекалнс, Александр Викторович
Monolītiska silīcija dioksīda iegūšana ar sola-gela metodi
2021
Darbā pilnveidota SiO2 sola-gela sintēzes metode ar mērķi iegūt monolītiskus, optiski caurspīdīgus, nesaplaisājušus paraugus. SiO2 paraugu konsolidācijas process pētīts, tos pakāpeniski izkarsējot gaisā, skābeklī vai ūdeņradī. SiO2 paraugu īpašību pētījumos izmantotas struktūranalīzes, termogravimetrijas, optiskās spektroskopijas un elektronu mikroskopijas metodes. Darbā iegūts stiklveida monolītisks SiO2, pie termiskās apstrādes temperatūrām 600 °C un augstākām. Sintezētajos paraugos novērota palielināta 3-locekļu SiO2 saišu gredzenu koncentrācija, kā arī brīvās un ar ūdeņraža saiti saistītās silanolgrupas (Si-O-H). Silanolgrupu koncentrāciju iespējams samazināt, karsējot paraugu 1000 °C –…
Interrelationships between mycorrhizal symbiosis, soil pH and plant sex modify the performance of Antennaria dioica
2010
AM symbiosis is usually beneficial for plants, but the benefits gained may depend on the soil abiotic factors. In dioecious plants, female and male individuals have different resource demands and allocation patterns. As a consequence of these differences, it is logical to assume that female and male plants differ in their relationship with arbuscular mycorrhizal (AM) fungi, although this has rarely been examined. We used a factorial greenhouse experiment to investigate whether female and male plants in the dioecious model species Antennaria dioica have a different relationship with their AM symbionts under two soil pH levels. In particular, we asked: (1) Do the sexes in A. dioica have sex-s…
Utilization of impedance spectroscopy to investigate the self-assembly behavior of amphiphiles soluble in supercritical carbon dioxide: Preliminary r…
2007
Abstract A mixture of CO 2 , water, methyl orange (MO) and Dynol 604 surfactant was analyzed at 309 K and 20 MPa simultaneously by impedance and UV–vis spectroscopy. A plot of the static dielectric constant as a function of the surfactant concentration was obtained using a suitable equivalent circuit to elaborate impedance data. Experimental points can be fitted by two different straight lines whose intersection occurs at about 0.13% (w/w) concentration of Dynol. When the surfactant concentration crossed the aforementioned value, a peak was detectable in the UV–vis spectrum at a wavelength range corresponding to the absorption of MO; absorbance of the peak increased with the surfactant conc…
Upgrading landfill gas using a high pressure water absorption process
2014
Abstract The upgrading of landfill gas (methane 54.2 ± 2.0%, carbon dioxide 42.1 ± 2.4% and nitrogen 3.7 ± 1.2%) was studied with a pilot-scale high pressure water absorption system consisting of absorption, desorption and gas drying units. The gas was upgraded in two phases and with two absorption columns operating in sequence in pressures up to 180 bar, and with initial pressures of 8 and 10 bar. This type of high pressure process, where water is used for increasing the gas pressure, does not need a separate compression unit to produce the gas pressure required by gas vehicles. Product gas with a methane contents ranging from 83.0% to 92.1% was achieved with differing process parameters, …
Study of water adsorption and capillary bridge formation for SiO(2) nanoparticle layers by means of a combined in situ FT-IR reflection spectroscopy …
2014
Water adsorption and capillary bridge formation within a layer of SiO2-nanoparticles were studied in situ by means of a combination of quartz crystal microbalance (QCM-D) with dissipation analysis and Fourier transformation infrared reflection absorption spectroscopy (FT-IRRAS). FT-IR data were employed to distinguish the “ice-like” and “liquid-like” contributions and to support the analysis of the QCM-D data concerning mass change and dissipation. Combined measurements show that for SiO2-nanoparticles with a diameter of about 250 nm, the formation of two adsorbed monolayers of water as well as bulk water leads to a rather linear increase in the dissipation for relative humidity values of u…
Intrinsic absorption threshold of stishovite and coesite
2004
Abstract The optical absorption spectra of the small mono-crystals samples of stishovite and coesite were studied at first. The intrinsic absorption threshold of stishovite is determined at 8.75 eV, being probably, highest in the family of different crystalline polymorph modifications of silicon dioxide. The absorption spectrum of stishovite is independent of temperature (studied in the range 290–450 K). The intrinsic absorption threshold of coesite mono-crystal situated near 8.6 eV at 293 K, coincides within experimental errors with that of α-quartz crystal, and depends on temperature, as used to be for the tetrahedron structured silicon dioxide crystalline modifications. A broad absorptio…