Search results for " area"

showing 10 items of 2302 documents

Preparation of polycrystalline TiO2 photocatalysts impregnated with various transition metal ions : characterization and photocatalytic activity for …

2002

A set of polycrystalline TiO2 photocatalysts loaded with various ions of transition metals (Co, Cr, Cu, Fe, Mo, V, and W) were prepared by using the wet impregnation method. The samples were characterized by using some bulk and surface techniques, namely X-ray diffraction, BET specific surface area determination, scanning electron microscopy, point of zero charge determination, and femtosecond pump-probe diffuse reflectance spectroscopy (PP-DRS). The samples were employed as catalysts for 4-nitrophenol photodegradation in aqueous suspension, used as a probe reaction. The characterization results have confirmed the difficulty to find a straightforward correlation between photoactivity and si…

431Materials scienceDiffuse reflectance infrared fourier transformScanning electron microscopeAnalytical chemistry436Surfaces Coatings and FilmsTransition metalSpecific surface areaMaterials ChemistryPoint of zero chargeCrystalliteDiffuse reflectionPhysical and Theoretical ChemistryPhotodegradationJournal of physical chemistry. B
researchProduct

Thermomineral waters of Greece: geochemical characterization

2020

75 °C). In terms of pH most results vary from 5.5 to 823 °C) ii) warm (23 40 °C) iii) thermal (40 75 °C) and iv) hyperthermal (&gtfew springs show either very low pH (&lt10) proposing serpentinization processes. Regarding TDS concentrations collected waters can be subdivided into low salinity (up to 1.5 g/L) brackish (up to 20 g/L) and saline (up to 43 g/L). The medium high salinities can be justified by mixing with sea water and/or strong waterrock interaction processes. Isotope composition of O and H ranges from 12.7 to +2.7 ‰ SMOW and from 91 to +12 ‰ SMOW respectively and is generally comprised between the Global Meteoric Water Line and the East Mediterranean Meteoric Water Line. Only few water samples show a positive shift for δ18O possibly related to high temperature waterrock interaction processes. Carbon dioxide (18 997000 μmol/mol) or N2 (1100 989000 μmol/mol) or CH4 (&ltMany geothermal areas of Greece are located in regions affected by Miocene or Quaternary volcanism and in continental basins characterised by elevated heat flow. Moreover the majority of them is found along the coast as well as in islands of the Aegean Sea and thus thermal water is often brackish to saline due to marine intrusion into costal aquifer. In the present study almost 300 thermal and cold mineral water samples were collected along the Hellenic territory with their physicochemical parameters (temperature pH electrical conductivity and Eh) and the amount of bicarbonates (titration with 0.1N HCl) being determined in situ. Additionally gases found either in free or dissolved phase were sampled. Both water and gas samples were analysed at the INGVPa laboratories for major ions (Ion Chromatography) silica (Inductively Coupled Plasma Optical Emission Spectrometry) chemical composition of free and dissolved gases (Gas Chromatography) water isotopes (O and H) and carbon and helium isotopes of free and dissolved gases (Mass Spectrometry). The temperature of the investigated waters ranges from 6.5 to 98°C pH from 1.96 to 11.98 whilst Total Dissolved Solids (TDS) from 0.06 to 43 g/L. Based on the temperature parameter waters can be divided into four groups: i) cold (&lt0.5 913000 μmol/mol) are the prevailing gas species found in the studied sites. The δ13CCO2 values ranged from 20.1 to +8.5 ‰ whilst the isotope ratio of He from 0.21 to 6.71 R/RA.4) suggesting interaction with H2Srich gases or very high pH values (&gtSettore GEO/08 - Geochimica E Vulcanologia
researchProduct

El comercio exterior de la Unión Europea: Una desagregación regional.

2002

La culminación del proceso de integración europea, con la creación de una única divisa para doce de los países miembros, exige que el comercio exterior de la Unión Europea (UE) sea considerado de una forma unitaria. En este trabajo se analizan los resultados de la modelización de las exportaciones de la UE hacia otras áreas en proceso de integración como NAFTA, Asia-Pacífico y Mercosur, que reciben más del 50 por 100 de las exportaciones de la UE. La utilización de las elasticidades renta y precio de las exportaciones permite obtener una primera aproximación a la influencia de las variables explicativas en este comercio. ismael@uv.es

:CIENCIAS ECONÓMICAS::Economía internacional::Operaciones comerciales internacionales [UNESCO]Elasticidad de la demandaAsia PacíficoMercosurUnión EuropeaUNESCO::CIENCIAS ECONÓMICAS::Economía internacional::Economía internacional: Area Europea:CIENCIAS ECONÓMICAS::Economía internacional::Economía internacional: Area Europea [UNESCO]Exportaciones Integración económicaRelaciones comerciales internacionalesUNESCO::CIENCIAS ECONÓMICAS::Economía internacional::Operaciones comerciales internacionalesRelaciones comerciales internacionales; Exportaciones Integración económica; Elasticidad de la demanda; Unión Europea; Tratado de Libre Comercio; ASEAN; Asia Pacífico; MercosurTratado de Libre ComercioASEAN
researchProduct

The working partner in family enterprise : European and national issues

2021

The essay focuses on the discipline of the work done by one partner in the company of the other in cross-border couples and on the problems involved in this case. More specifically the focus is on the hermeneutical problems that arise both at the level of European legislation and at the level of Italian national discipline which is applicable according to European conflict criteria, showing the ambiguities and wide areas of shadow left uncovered by the latter.

:CIENCIAS JURÍDICAS [UNESCO]familiasociedad registradafamilycross-border couple2386-4567 22661 Actualidad jurídica iberoamericana 587897 2021 15 8113557 The working partner in family enterprise European and national issues Pascucciregistered partnershippareja transfronterizade facto cohabitation.UNESCO::CIENCIAS JURÍDICASFederico The essay focuses on the discipline of the work done by one partner in the company of the other in cross-border couples and on the problems involved in this case. More specifically the focus is on the hermeneutical problems that arise both at the level of European legislation and at the level of Italian national discipline which is applicable according to European conflict criteriashowing the ambiguities and wide areas of shadow left uncovered by the latter. Workerconvivencia de hecho. 196 213Trabajador
researchProduct

Optimized and automated estimation of vegetation properties: Opportunities for Sentinel-2

2014

La Biosfera es uno de los principales sistemas que conforman la Tierra. Su estudio permite comprender la relación entre la vegetación y el ciclo del carbono y cómo éste puede ser afectado por los cambios en los niveles de CO2 y los usos de suelo. Para el estudio de estas dinámicas a escala global y local, han sido desarrollados diversos modelos que son representaciones de la realidad en una escala y complejidad más simple. Parte de las variables de entrada de estos modelos son obtenidas mediante medidas de teledetección gracias al Global Climate Observing System (GCOS), que ha determinado un conjunto de 50 variables climáticas esenciales que contribuyen a los estudios de cambio climático qu…

:CIENCIAS TECNOLÓGICAS [UNESCO]:CIENCIAS TECNOLÓGICAS::Tecnología del espacio [UNESCO]leaf area indexUNESCO::CIENCIAS TECNOLÓGICAS::Tecnología del espacio:CIENCIAS DE LA TIERRA Y DEL ESPACIO::Otras especialidades de la tierra espacio o entorno [UNESCO]biophysical parameter retrievalradiative transfer models:CIENCIAS DE LA TIERRA Y DEL ESPACIO [UNESCO]leaf chlorophyll contentUNESCO::CIENCIAS TECNOLÓGICASLUT-based inversionempirical regression modelsmachine learningUNESCO::CIENCIAS DE LA TIERRA Y DEL ESPACIO::Otras especialidades de la tierra espacio o entornoSentinel-2UNESCO::CIENCIAS DE LA TIERRA Y DEL ESPACIO
researchProduct

Окказиональная поэзия: Послание в текстах культуры

2012

:HUMANITIES and RELIGION::Languages and linguistics [Research Subject Categories]:INTERDISCIPLINARY RESEARCH AREAS::Cultural heritage and cultural production [Research Subject Categories]
researchProduct

Ilgtspējīgas attīstības sociālā dimensija un sociālā inovācija : tēžu krājums

2016

Valsts pētījumu programmas “Inovācija un ilgtspējīga attīstība: Latvijas pēckrīzes procesi globālā kontekstā (SUSTINNO)” finanasējums

:INTERDISCIPLINARY RESEARCH AREAS [Research Subject Categories]
researchProduct

Jauno vēsturnieku zinātniskie lasījumi, 5/2019

2020

"Jauno vēsturnieku zinātniskie lasījumi" sasniedzis piektā krājuma slieksni. Tajā iekļauti desmit jauno zinātnieku raksti, kas tapuši no starptautiskā konferencē ar tādu pašu nosaukumu nolasītiem referātiem. Valmieras muzejā notiekošā konference ir ikgadējs zinātniskās dzīves notikums, ko nodrošina Latvijas Universitātes (LU) Latvijas vēstures institūts un Valmieras muzejs, LU un Valmieras muzeja savstarpējā sadarbības līguma ietvaros. Krājumā iekļauti Aigas Bērziņas, Ilonas Jekeles, Zanes Krūmiņas, Edgara Plētiena, Elīnas Rasnaces, Viestura Rasnača, Gundegas Skagales, Kaspara Stroda, Jāņa Tomaševska un Gunta Vāvera raksti. Jauno zinātnieku pētījumu hronoloģiskās robežas sniedzas no vidusla…

:INTERDISCIPLINARY RESEARCH AREAS [Research Subject Categories]:HUMANITIES and RELIGION [Research Subject Categories]
researchProduct

Attīstības un inovācijas izpēte Latvijā: tēžu krājums

2017

Sagatavots Valsts pētījumu programmas “Inovācija un ilgtspējīga attīstība: Latvijas pēckrīzes procesi globālā kontekstā (SUSTINNO)” ietvaros.

:INTERDISCIPLINARY RESEARCH AREAS [Research Subject Categories]:SOCIAL SCIENCES::Social sciences::Sociology [Research Subject Categories]
researchProduct

LU Filoloģijas un filozofijas fakultātes bibliotēkas pirmskara perioda inventāra grāmatas

2022

Latvijas Universitātes (LU) Filoloģijas un filozofijas fakultātes bibliotēkas pirmskara perioda inventāra grāmatas, salīdzinot ar pārējo LU struktūrvienību bibliotēku inventāra grāmatām, sniedz vispilnīgāko vēsturisko informāciju. Tās ne tikai uzskaita fakultātes bibliotēkas krājumu, bet var tikt izmantotas kā pavediens uz savstarpēji saistītu informāciju par starpkaru perioda un Universitātes dzīvi. Fiksētā informācija par iegādes avotiem (pirkšana/ziedošana, iesaistītās personības), grāmatu un periodisko izdevumu uzskaitījumā gadu gaitā vērojamās izmaiņas attiecībā uz tendencēm studiju procesa nodrošināšanas tematikas ziņā vai prioritātēm grūtos apstākļos - tas viss ir bagātīgs vēsturiskā…

:INTERDISCIPLINARY RESEARCH AREAS [Research Subject Categories]Formation of library holdingsIzdevumu ieguves avotiBook acquisitionFiloloģijas un filozofijas fakultātes bibliotēkaHistory of the University of LatviaLatvijas Universitāte:HUMANITIES and RELIGION::History and philosophy subjects::History subjects::Book and library history [Research Subject Categories]Library of the Faculty of Philology and PhilosophyBibliotēkas krājuma veidošanāsLatvijas Universitātes vēstureBibliotēkas inventāra grāmatasUniversity of Latvia
researchProduct