Search results for "Tv"
showing 10 items of 4565 documents
Does phosphorus affect the industrial Portland cement reactivity?
2018
Abstract The effect of phosphorous on the mineralogy and reactivity of Portland cement has been investigated through an industrial clinkers series. The samples were collected from the same Tunisian cement plant and classified according to the content of P2O5 from 0.5% to 1.1%. All samples were manufactured at the same thermal and cooling conditions as well as possible. The specimens were characterized by X-ray fluorescence spectrometry and optical microscopy techniques and their mineralogy was determined by X-ray powder diffraction coupled to the Rietveld analysis. The cements reactivity prepared from the clinkers was followed by means of isothermalcalorimetry. The compressive strength of t…
Teachers’ Job Satisfaction: Findings from TALIS 2013 Study
2015
<p><em>This paper examines teachers’ satisfaction with their profession and work environment in relation to other environmental factors in schools. Latvian data from the OECD TALIS 2013 study are used in the data analysis. The aim of the study was to find out whether there is any relationship between teacher satisfaction with their work environment and profession and a varietyofvariablescharacterizingschoolsandstudents. The research question is: what are the most important factors associated with teachers' satisfaction with their job at school? Applied research methods are frequency analysis and measures of central tendency. The results of the research reveal that overall Latvia…
The Translation Scene in Latvia (Latvian SSR) during the Stalinist Years
2018
[full article, abstract in English; abstract in Lithuanian] In this paper the author continues to explore the translation scene in 20th century Latvia (Veisbergs 2016a). The period under discussion covers 1945–1953, the years of Stalin’s rule after WWII until his death in 1953. The translation situation is described by discussing nationalisation and centralisation of publishers, book liquidation, censorship, ideologisation and politicisation, russification, Latvian émigré translations and other aspects of importance in an attempt to present the translation scene of the period from different angles. At the end of the article an extensive list of references is provided that can serve as an in…
Centralizēti reģistrēto bioloģisko un biolīdzīgo medikamentu reimatoīdo slimību ārstēšanai pieejamība Latvijā
2022
Bioloģiskajiem medikamentiem ir nozīmīga loma dažādu slimību terapijās, savukārt to biolīdzīgie analogi palīdz padarīt bioloģisko terapiju lētāku un pieejamāku pacientiem. Viena no slimībām, kur tiek izmantota bioloģiskā terapija, ir reimatoīdais artrīts (RA). Ja šī slimība progresē, tad nākotnē tā var novest pie nopietniem veselības traucējumiem vai pat invaliditātes, kas var radīt finansiālo slogu gan valstij, gan pacientam. Pētījumam veikšana tika izvēlētas kvantitatīvās datu ieguves metodes. Tika analizēti centralizēti reģistrēti 19 bioloģiskie un 36 biolīdzīgie medikamenti. No tiem uz RA terapiju attiecās 7 bioloģiskie un 22 biolīdzīgie medikamenti. Latvijā ir pieejami 6 bioloģiskie un…
Latvijas ceļveži krievu un poļu valodā : kontrastīvais aspekts.
2015
Aleksandra Maria Žmuda Latvijas ceļveži krievu un poļu valodā: kontrastīvais aspekts: maģistra darbs. – Rīga, 2015. Pētījums veltīts Latvijas ceļvežu analīzei krievu un poļu valodās. Ceļveži tiek izskatīti kontrastīvajā un hronoloģiskajā aspektā. Pētījuma galvenais mērķis ir leksiskā materiāla analīze, ar kuras palīdzību tiek noteiktas makrovienības, kas rada neviennozīmīgo Latvijas tēlu dažādu valodu ceļvežos. Šis tēls tiek radīts ar vairāku valodas līdzekļu palīdzību: leksiku (verbiem, īpašības vārdiem, lietvārdiem u.c.), vērtēšanas semantiku, tēlainās izteiksmes līdzekļiem. Darba autore salīdzina un analīzē ceļvežu tekstus un noteic leksiski semantisko struktūru neatbilstību. Šādas neatb…
Rietveld Refinement of Tetragonal V4+–ZrO2 Solid Solutions Obtained from Gels by X-ray Powder Diffraction
2002
Abstract The crystal structure of three tetragonal V x Zr 1− x O 2 solid solutions, with x =0.025, 0.05, and 0.075, prepared by heating dried gel precursors at 450°C in air atmosphere, have been determined by Rietveld refinement on the basis of powder X-ray powder diffractometer data. They contain V 4+ cations surrounded by eight oxygens, four at a distance between 2.079 and 2.093 A and another four at longer distances between 2.369 and 2.348 A. The estimation of the crystal average oxygen position from the X-ray lattice parameter of V x Zr 1− x O 2 conform with the relationship proposed by Howard et al. ( J. Am. Ceram. Soc. 81, 241 (1998)).
Structural and conductivity studies in LiFeP 2 O 7 , LiScP 2 O 7 , and NaScP 2 O 7
2000
Structural studies of LiScP2O7 by Rietveld refinement confirm that this material is isostructural with LiFeP2O7 studied previously. However, NaScP2O7 shows a structure different from the structural types of the basic group of NaIMIIIP2O7 known thus far. Systematic ranges for the six structural types of AIMIIIP2O7 are presented in terms of ion radii sums and ratios. The framework of LiMP2O7 (M=Sc, Fe) has rather wide tunnels running along the crystallographic c-axis. This feature has determined our interest to check the ion conductivity in AIMIIIP2O7 (A=Li, Na; M=Sc, Fe). The bulk conductivity, however, is low in these compounds, 10−6–10−7 S/cm at 300 °C, as determined by impedance spectrosc…
Phase analysis and oxygen strorage capacity of ceria-lanthana-based TWC promoters prepared by sol-gel routes
2002
Ceria–lanthana-based promoters of three-way catalysts are synthesized by two different sol–gel routes, involving nitrate precursors. The oxygen uptake ability of these compounds is measured by O2 chemisorption. The specific surface area is determined by N2 adsorption (BET). X-ray diffraction data are analyzed by Rietveld refinement, demonstrating that lanthanum forms solid solution with CeO2; its total amount in ceria depends on the competitive formation of La–Al mixed oxides and on the synthetic method. The O2 uptake ability is essentially determined by the La content in the ceria–lanthana solid solution, while it is independent on the surface area and on the CeO2 particle size. The O2 upt…
Template induced crystallization of biominerals on self-assembled monolayers of alkylthiols
1998
Abstract We have studied the templated crystallization of the three polymorphs of calcium carbonate on self-assembled monolayers of ω -substituted alkylthiols on gold surfaces. Our interest has been to model biomineralization processes by examining the effect of structured organic templates on heterogeneous nucleation at the inorganic–organic interphase. The crystallization of the three polymorphs was carried out from solution at two different temperatures. The crystals that were formed on the surface were examined using scanning electron microscopy. Phase quantification was achieved through Rietveld analysis of the X-ray diffraction profiles. This study provides significant clues on factor…
Norwegian children's acquisition of the dialect feature r
2019
The pronunciation of r is a central dialect feature of Norwegian. The main division is between a front and a back pronunciation. The back realization is acquired relatively early (around age 4), while the front realization is one of the most problematic sounds to acquire, and substitution sounds are frequent. Using two data collection points, we show how four children learning Norwegian start by substituting r use of the r of their dialect area or idiolectal surroundings. The main argument of this article is that the r-development of kindergarten children is not only governed by rules on acquisition and development lines, but also by the sociolinguistic variation and use of r in the Norwegi…