Search results for "ARS"
showing 10 items of 5947 documents
Sorption of V and VI group metalloids (As, Sb, Te) on modified peat sorbents
2016
AbstractThe present work investigates arsenic, antimony and tellurium sorption using iron modified peat. The results were obtained using batch tests and the sorption was studied as a function of initial metalloid concentration, pH and sorption time, as well as the presence of competing substances. The obtained results indicate that modification of peat with Fe compounds significantly enhances the sorption capacity of the sorbents used for sorption of arsenic, antimony and tellurium. The optimal pH interval for the sorption of Sb(III) is 6.5–9 and for As(V) and Sb(V) – 3–6, while As(III) and tellurium sorption using Fe-modified peat is favourable in a wider interval of 3–9. The presence of c…
V un VI grupas metaloīdu sorbcijas izpēte uz modificētiem biomateriālu sorbentiem
2015
Promocijas darbā veikta augstas pievienotās vērtības sorbentu izstrāde, izmantojot vienu no Latvijas nozīmīgākajiem vietējiem derīgajiem izrakteņiem, un pētītas to izmantošanas iespējas. Promocijas darbā sintezēti sorbenti, kuru pamatā ir biomateriāli, kas modificēti ar dzelzs savienojumiem. Izvērtētas kūdras kā sorbenta izmantošanas iespējas, kā arī pētītas kūdras modificēšanas metodes un to ietekme uz sorbcijas kapacitāti. Bez kūdras izmantoti arī tādi materiāli kā sūnas, skaidas, salmi, niedres, humīnskābes un salīdzinājumam arī smiltis, kas arī modificēti ar dzelzs savienojumiem. Sintezētie sorbenti raksturoti, izmantojot skenējošo elektronmikroskopiju (SEM), Furjē tanformācijas infrasa…
The methods and techniques of the research on war and conflicts. The outline of the issue
2018
The aim of this paper is to present the methodological assumptions necessary to examine the wars and conflicts. Authors refer to the genesis of the research on the phenomenon of war that occurred after the end of World War II. Moreover, the authors selects the research methods. The wide range of research methods will be applied in international relations, such as an empirical report, based on the description of the various conflicts and their interpretation. It must be emphasized that methodological technique applied in humanities and empirical sciences is necessary to examine war and peace. Above all, two methods are the most important, that is, inductionism that allows to collect and logi…
El Índice de la Felicidad Nacional Bruta como complemento ante las limitaciones de los modelos socio-económicos tradicionales: El caso del Reino de B…
2018
El siguiente ensayo tiene por objetivo repasar las limitaciones que presentan los modelos socio-económicos tradicionales, como el Producto Interno Bruto per cápita, para medir la calidad de vida y el bienestar en aquellas naciones con concepciones, en la economía y el consumo, distintas a las que se manejan en Occidente y en la economía ortodoxa. Se describirán, en qué sentido, los estudios cualitativos, de carácter subjetivos enfocados principalmente en la felicidad, complementan a los modelos clásicos que se vinieron utilizando en el siglo anterior. En este marco se da cuenta del Índice de Felicidad Nacional Bruta, ideado e implementado en el Reino de Bután, pequeño estado budista locali…
Economic Globalization: From Microeconomic Foundation to National Determinants
2015
Abstract For many years, globalization was at the main source of economic growth for the world economy. During and after the 2009 crisis many questions about the positive effects of globalization have arisen. In this paper we argue there are two dimensions of economic globalization, micro and macro, and the perspectives of globalization is more related to the microeconomic determinants. Looking to the definitions and measures of globalization we conclude that for most of the countries the macro dimensions are important and many of them irreversible and not questionable in these days – barriers of trade, political integration, etc., but the microeconomic behavior of individuals and companies…
Applicability of a displaced-beam laser scintillometer in a sparse tall Mediterranean vegetation
2009
Recent studies showed that the sensible heat flux (H) measured with an array of eddy-correlation system has an high spatial and temporal variability over sparse tall vegetation, such as olive trees, whereas H determined with a displaced-beam laser scintillometer (DBLS) appeared to behave more stable. In this study, the results are shown of two field experiments performed over an olive tree plantation in Sicily in 2007 and 2008, in order to investigate the applicability of a DBSL in combination with remote sensing techniques for the actual evapotranspiration assessment. In 2007 the laser beams was closer to the top of the canopy than in 2008. Various aspects of the scintillation method will …
De la fundación de un país al muro fronterizo: una perspectiva social e histórica de la migración en Estados Unidos de Norteamérica
2019
El discurso del actual presidente norteamericano, Donald Trump, que ha reivindicado la construccion de un muro en la frontera de ese pais con Mexico; ha manejado cifras que superaban la estimacion existente de extranjeros no autorizados residiendo en el pais y cuya disputa con el partido democrata llevo al shutdown del gobierno mas extenso de la historia del pais, conducen a pensar que el tema de la inmigracion ilegal en los Estados Unidos es creciente. Sin embargo, esa cifra no solamente no aumento sino que descendio (Warren, 2016), en el marco de un contexto que puede dar cuenta de discriminacion y barreras para la integracion plena de los migrantes. El texto considera brevemente el panor…
Problemy osób starszych - rodziców emigrantów : przykład województwa opolskiego
2016
Production technology of early-Hellenistic lime-based mortars from a Punic-Roman residential area at Palermo (Sicily)
2016
The topic of this study was the mineralogical and petrographic characterization of lime-based mortars of Hellenistic-Roman age (3rd century BC), taken from a residential area located in the historical centre of Palermo, near the walls of the Punic-Roman Neapolis, recently brought to light by excavations carried out by the Soprintendenza BB.CC.AA. of Palermo at Palazzo del Gran Cancelliere (Palermo). The collected mortars have been analyzed by optical microscopy (PLM), X-ray powder diffraction analysis (XRPD) and scanning electron microscopy coupled with energy dispersive spectrometry (SEM-EDS). The study was aimed to define the “recipe” (composition of temper and binder, temper size distrib…
Kalcīts un tā veidošanās apstākļi augšējā devona Daugavas svītas dolomītos Latvijas centrālajā un austrumu daļā
2017
Bakalaura darbā “Kalcīts un tā veidošanās apstākļi augšējā devona Daugavas svītas dolomītos Latvijas centrālajā un austrumu daļā” ir raksturotas minerāla kalcīta fizikālās īpašības, mikroelementu saturs un veidošanās apstākļi. Pētījumi veikti 8 dolomīta atradnēs; ģeoloģiskajā griezumā un atradņu teritorijā salīdzinātas kalcīta īpašības. Testētas kalcīta fluorescences izpausmes, pētīti plānslīpējumi, raksturoti kalcītā sastopamie mikroelementi un oglekļa stabilo izotopu attiecības tajā. Secināts, ka kalcīts kristalizējies no atmosfēras ūdeņiem sauszemes apstākļos. Šis minerāls veidojies paleokarsta procesa beigu stadijā pēc iegruvumu izveidošanās. Atslēgas vārdi: mineraloģija, paleokarsts, f…