Search results for "GST"
showing 10 items of 874 documents
Die landwirthschaftlich-chemische Versuchsstation am Polytechnikum zu Riga, Lief. 2
1877
Bericht über die Thätigkeit in den Jahren 1874/75 und 1875/76.
Latvijas un Dānijas logopēdu/audiologopēdu studiju pieredze
2022
Diplomdarba mērķis izpētīt Latvijas un Dānijas logopēdijas (arī skolotāju-logopēdu, audiologu un audiologopēdu) speciālistu studiju pieredzi, un iepazīties ar augstskolu mācībspēku viedokļiem. Diplomdarba aktualitāti nosaka tas, ka augstākās izglītības kvalitāte ir cieši saistīta ar sabiedrības attīstību kopumā. Kopš 1999. gadā parakstītās Boloņas deklarācijas Eiropā tika izveidota vienota augstākās izglītības sistēma, valstu izglītības ministri vienojās par vienotu koordināciju, lai veicinātu iedzīvotāju mobilitāti un konkurētspēju. Taču Latvija, diemžēl, neatrodas ne izglītības, ne arī kādu citu reitingu augšgalā, turpretim, Dānija ieņem vadošās pozīcijas ne tikai Eiropā, bet visā pasaulē…
Alma Mater: 2012/ Ziema
2012
Results from the Fourth WMO Filter Radiometer Comparison for aerosol optical depth measurements
2018
Abstract. This study presents the results of the Fourth Filter Radiometer Comparison that was held in Davos, Switzerland, between 28 September and 16 October 2015. Thirty filter radiometers and spectroradiometers from 12 countries participated including reference instruments from global aerosol networks. The absolute differences of all instruments compared to the reference have been based on the World Meteorological Organization (WMO) criterion defined as follows: 95% of the measured data has to be within 0.005 ± 0.001∕m (where m is the air mass). At least 24 out of 29 instruments achieved this goal at both 500 and 865 nm, while 12 out of 17 and 13 out of 21 achieved this at 368 and 412 nm,…
Stand der Forschung im Bereich der Bildungsökonomie : Allgemeine Übersicht und französische Situation
1994
Benner, Dietrich [Hrsg.]; Lenzen, Dieter [Hrsg.]: Bildung und Erziehung in Europa. Beiträge zum 14. Kongreß der Deutschen Gesellschaft für Erziehungswissenschaft vom 14.-16. März 1994 in der Universität Dortmund. Weinheim u.a. : Beltz 1994, S. 135-148. - (Zeitschrift für Pädagogik, Beiheft; 32)
Oxide anodes in electro-organic oxidation. Oxidation of maleic addon tungsten oxide anodes
1982
The electrochemical oxidation of maleic acid on tungsten anodes has been investigated. Glyoxal and carbon dioxide were the main products together with tartaric acid and acetaldehyde. Glyoxal is also obtained as the main product from the oxidation ofd-tartaric acid. Under the same conditions succinic acid is completely oxidized to carbon dioxide and water. The anodic dissolution of tungsten and the oxidation of water to oxygen become predominant in the final stages of the electrolyses.
Electrolyses model development for metal/electrolyte interface: Testing with microrespiration sensors
2011
Abstract Initial process of electrolysis is investigated using platinum and tungsten wires as hydrogen electrodes and inductive kickback voltage peak based power unit. Microelectrodes are used to determine concentrations of dissolved hydrogen and pH close to wire electrodes. It is observed that concentration of dissolved hydrogen increases faster on tungsten electrode as on platinum. Authors explain this fact with differences of hydrogen evolution reaction on both materials – inductive kickback voltage peak power unit is supplying very short voltage pulses with limited energy what is enough only for hydrogen adsorption on platinum electrode, but is sufficient for full hydrogen evolution rea…
Festschrift zur Feier des 50 jährigen Bestehens des ersten Dorpatschen Lehrer-Seminars am 7. August 1878
1878
Cutting Tool Materials
2008
This chapter provides the state-of-the-art materials engineering sector that produces cutting tool materials for different manufacturing branches. It highlights the special demands on this special material group for modern machining technologies. Five groups of cutting tool materials are characterized in terms of their mechanical and thermo-physical properties: high-speed steels, sintered tungsten carbides, cermets, ceramics and superhard materials, all as conventional (uncoated) and coated grades. The most popular techniques of coating deposition on various substrates are described. Practical examples of cutting tool inserts made of various materials produced by leading world manufacturers…
Visible-light photoelectrodegradation of diuron on WO3 nanostructures
2018
[EN] The degradation of pesticide diuron has been explored by photoelectrocatalysis (PEC) under visible light illumination using two different WO3 nanostructures, obtained by anodization of tungsten. The highest degradation efficiency (73%) was obtained for WO3 nanosheets synthesized in the presence of small amounts of hydrogen peroxide (0.05 M). For that nanostructure, the kinetic coefficient for diuron degradation was 133% higher than that for the other nanostructure (anodized in the presence of fluoride anions). These results have been explained by taking into account the different architecture and dimensions of the two WO3 nanostructures under study.