Search results for "ISMU"
showing 10 items of 685 documents
Heterovalent BiIII/PbII ionic substitution in one-dimensional trimethylsulfoxonium halide pseudo-perovskites (X = I, Br)
2021
We report on the synthesis and characterization of novel lead and bismuth hybrid (organic-inorganic) iodide and bromide pseudo-perovskites (ABX3) containing the trimethylsulfoxonium cation (CH3)3SO+ (TMSO) in the A site, Pb/Bi in the B site, and Br or I as X anions. All of these compounds are isomorphic and crystallize in the orthorhombic Pnma space group. Lead-based pseudo-perovskites consist of one-dimensional (1D) chains of face-sharing [PbX6] octahedra, while in the bismuth-based ones, the chains of [BiX6] are interrupted, with one vacancy every third site, leading to a zero-dimensional (0D) local structure based on separated [Bi2I9]3- dimers. Five solid solutions for the iodide with di…
Design, assembly and characterization of silicide-based thermoelectric modules
2016
ID: 1143 In: Energy conversion and management, 13-21. Summary: Highlights•Novel silicide-based thermoelectric modules were experimentally investigated.•The modules produced high power of 1.04 W at 405 °C and 3.24 W at 735 °C.•An estimated module efficiency of 5.3% represent the highest reported for silicide systems.AbstractSilicides have attracted considerable attention for use in thermoelectric generators due mainly to low cost, low toxicity and light weight, in contrast to conventional materials such as bismuth and lead telluride. Most reported work has focused on optimizing the materials properties while little has been done on module testing. In this work we have designed and tested mod…
A field methodology to study effects of UV radiation on fish larvae.
2003
There is a considerable lack of in situ specific information about the effects of UV-B radiation on limnic animals studied in the field. We exposed larval pike (Esox lucius L.) in two types of cuvettes (glass and quartz) placed at different depths (5 or 15 cm) to natural solar UV or to artificially enhanced UV-B (lamps on 3 h per day), simulating the scenarios for coming decades. Dose realism and comparability with earlier laboratory experiments was the main purpose, and therefore UV-B irradiances to the surface as well as underwater irradiances were directly measured. Result showed that UV-B dose rates in natural waters are low even though DOC concentration was low (4.8 mg/l) in our study …
Debating Europe: Effects of the “Eurovision Debate” on EU Attitudes of Young German Voters and the Moderating Role Played by Political Involvement
2016
In the run-up to the elections to the European Parliament in 2014, EU citizens had the unprecedented opportunity to watch televised debates between the candidates running for president of the European Commission. The most important debate was the so-called "Eurovision debate", which was broadcasted in almost all EU member states. In this study we explore the responses of a sample of 110 young German voters, who watched this debate, to the candidates' messages and whether exposure to the debate caused a shift in the respondents' attitudes towards the EU. Combining data from a quasi-experiment, real-time response data, and data from a content analysis of the debate, we find that respondents' …
Grafēna un bismuta selenīda heterostruktūru sintēze un īpašības
2018
Grafēna un bismuta selenīda heterostrūkturu sintēze un īpašības . Nečiporenko A., zinātniskie vadītāji asoc. prof. Dr.chem. Donāts Erts., Mag. chem. Margarita Baitimirova. bakalaura darbs, 31 lappuses, 13 attēli, 2 tabulas, 37 literatūras avoti, 1 pielikums. Latviešu valodā. Darbā ir veikta Bi2Se3/grafēns heterostrūkturu sintēze ar fizikālo tvaiku nogulsnēšanas metodi, kā izejas materiālu izmantojot kristālisku Bi2Se3. Darbā tika pētītas Bi2Se3 nanostruktūru veidošanas sākumstadijas uz dažādos veidos apstrādāta grafēna un vizlas. Iegūtas heterostruktūras tika analizētas ar skenējošo elektronu mikroskopu un atomspēku mikroskopu.
Ultraplānu bismuta selenīda nanostruktūru iegūšanas metodes
2017
Ultraplānu bismuta selenīda nanostruktūru iegūšanas metodes. Biezā K., zinātniskie vadītāji - asoc. prof., Dr. ķīm., Donāts Erts, Dr. Jana Andžāne, Maģistra darbs, 49 lappuses, 25 attēli, 9 tabulas, 30 literatūras avoti, 5 pielikumi. Latviešu valodā. Bismuta selenīds ir topoloģiskais izolators, tas ir materiāls, kura lielākā daļa tilpumā ir dielektriķis, toties ārējā virsma ir vadoša. Topoloģisko īpašību uzlabošanai un tālākam praktiskajam pielietojumam svarīgi iegūt plānas nanostruktūras ar biezumu zem 10 nm, kam, savukārt, ir liela praktiska nozīme topoloģisko izolatoru fundamentālajos pētījumos un materiāla pielietojumam kā termoelektriķim. Darbā pielietotas vairākas metodes, lai iegūtu …
The overstated generational gap in online news use? A consolidated infrastructural perspective
2021
Recent research by Taneja et al. suggested that digital infrastructures diminish the generational gap in news use by counteracting preference structures. We expand on this seminal work by arguing that an infrastructural perspective requires overcoming limitations of highly aggregated web tracking data used in prior research. We analyze the individual browsing histories of two representative samples of German Internet users collected in 2012 ( N = 2970) and 2018 ( N = 2045) and find robust evidence for a smaller generational gap in online news use than commonly assumed. While short news website visits mostly demonstrated infrastructural factors, longer news use episodes were shaped more by …
Risperidona lietošana bērniem ar autismu vai šizofrēniju un ar to saistīto risku izvērtējums
2015
Risperidons ir efektīvs un plaši pielietots neiroleptiskais līdzeklis, kura lietošana bērniem ar autismu vai šizofrēniju bieži saistīta ar hiperprolaktinēmijas attīstīšanos. Pētījumā apkopoti dati par risperidona nozīmēšanas biežumu Bērnu Psihiatrijas Klīnikā, hiperpolaktinēmijas attīstības risku un to atkarību no bērna dzimuma. Darbā secināts, ka autisma un šizofrēnijas pacientiem pastāv ļoti augsts hiperprolaktinēmijas risks -61% autisma un 94% šizofrēnijas pacientiem noteikta risperidona izraisīta hiperprolaktinēmija. Pētījumā izvērtēta bērnu vecāku informētība par risperidona lietošanas riskiem. Pie hipeprolaktinēmijas autisma gadījumā pacientiem medicīniskās palīdzības pamatmetode ir r…
Oxidative stress induces the expression of the major histocompatibility complex in murine tumor cells.
2001
The effect of t-butyl hydroperoxide (t-BOOH) on the induction of the Major Histocompatibility Complex (MHC) class I genes has been studied in two cell clones (B9 and G2) of the methylcholanthrene-induced murine fibrosarcoma GR9. These two clones were selected based on their different biological and biochemical behavior specially related to their tumor induction capability when injected into a BALB/c mouse. t-BOOH (0.125 mM) induced the expression of H-2 molecules in both cell clones. In B9 cell clone, in which MHC basal expression is very low or absent, t-BOOH significantly induced H-2Kd, H-2Dd and H-2Ld molecules. In G2 cell clone the expression of MHC class I genes was also enhanced by th…
Does the EMU Need a Fiscal Transfer Mechanism?
2004
Summary: The aim of this paper is to investigate how the birth of a central fiscal authority or the creation of a fiscal transfer mechanism could improve the action of fiscal policy in terms of stabilization in the EMU. In particular, the paper examines the theoretical reasons to support this conclusion and provides empirical evidence that shows how the EMU is not able to face asymmetric and symmetric idiosyncratic shocks. Zusammenfassung: Die zentrale Frage des Aufsatzes lautet: Ob und wie kann eine zentrale Fiskalbehorde oder ein fiskalischer Transfermechanismus die fiskalpolitische Stabilisierung in der EWU verbessern? Dazu werden theoretische Argumente und empirische Evidenz prasentiert…