Search results for "lek"

Approaching a “naked” boryl anion: amide metathesis as a route to calcium, strontium, and potassium boryl complexes

2020

Abstract Amide metathesis has been used to generate the first structurally characterized boryl complexes of calcium and strontium, {(Me3Si)2N}M{B(NDippCH)2}(thf)n (M=Ca, n=2; M=Sr, n=3), through the reactions of the corresponding bis(amides), M{N(SiMe3)2}2(thf)2, with (thf)2Li‐ {B(NDippCH)2}. Most notably, this approach can also be applied to the analogous potassium amide K{N(SiMe3)2}, leading to the formation of the solvent‐free borylpotassium dimer [K{B(NDippCH)2}]2, which is stable in the solid state at room temperature for extended periods (48 h). A dimeric structure has been determined crystallographically in which the K+ cations interact weakly with both the ipso‐carbons of the flanki…

Electronic structure of the glyoxalbis(2-hydroxyanil) (gha) ligand in [CoIII(gha)(PPh3)2]+: radical vs. non-radical states

2008

The synthesis, structure and spectroscopic properties of a complex salt [CoIII(gha)(PPh3)2][CoIICl3(PPh3)]·C2H5OH (1) are reported; gha = glyoxalbis(2-hydroxyanil). This is the first single crystal X-ray structure of a (gha)2− complex with a transition element. Though the determined bond parameters and UV-Vis spectroscopic data correlate well with a diradical description for the cation in 1, detailed electronic structure calculations using density functional theory confirm that [Co(gha)(PPh3)2]+ can be described as a closed shell singlet species which nevertheless displays an interesting electronic structure with significant electron transfer to the formally unoccupied LUMO of the square pl…

Hybrid Engagement: Discourses and Scenarios of Entrepreneurial Journalism

2018

Although the challenge posed by social media and the participatory turn concerns culture and values at the very heart of journalism, journalists have been reluctant to adopt participatory values and practices. To encourage audience participation and to offer journalism that is both trustworthy and engaging, journalists of the future may embrace a hybrid practice of journalistic objectivity and audience-centred dialogue. As innovative and experimental actors, entrepreneurial journalism outlets can perform as forerunners of such a culture. By analysing discourses in the “About Us” pages of 41 entrepreneurial journalism outlets, the article examines the emerging journalistic ethos of entrepren…

Latvijas Universitātes Raksti; 777 .sēj.

2011

Agro jauno laiku Rīgas kapsētu apbedījumu izpēte ar senās DNS analīzēm: nozīmīgākās pieejas un izpētes perspektīvas

2020

Bakalaura darba mērķis ir noskaidrot, kā ar senās DNS analīžu palīdzību ir iespējams papildināt jau esošās zināšanas, kas iegūtas ar tādām pētniecības metodēm kā literatūras un avotu analīze, kā arī arheoloģijas metodēm, kā piemēru izmantojot konkrētus agro jauno laiku Rīgas apbedījumus. Darba ietvaros tika veikta senās DNS izdalīšana un analīze, kuras rezultāti sasaistīti ar apbedījumu arheoloģisko un vēsturisko kontekstu, tādejādi izvirzot populāciju ģenētikas teorijā balstītas hipotēzes par konkrēto indivīdu izcelsmi. Darba rezultātā noteikta aptuvena izcelsme no mātes puses trijiem un dzimums visiem sešiem no pētāmajiem indivīdiem. Apbedītajiem konstatēti dažādi izcelsmes reģioni, kas a…

Syntheses and catalytic oxotransfer activities of oxo molybdenum(vi) complexes of a new aminoalcohol phenolate ligand.

2017

The new aminoalcohol phenol 2,4-di-tert-butyl-6-(((2-hydroxy-2-phenylethyl)amino)methyl)phenol (H2L) was prepared by a facile solvent-free synthesis and used as a tridentate ligand for new cis-dioxomolybdenum(vi)(L) complexes. In the presence of a coordinating solvent (DMSO, MeOH, pyridine), the complexes crystallise as monomeric solvent adducts while in the absence of such molecules, a trimer with asymmetric Mo[double bond, length as m-dash]O→Mo bridges crystallises. The complexes can catalyse epoxidation of cis-cyclooctene and sulfoxidation of methyl-p-tolylsulfide, using tert-butyl hydroperoxide as oxidant.

Interplay of spin-dependent delocalization and magnetic anisotropy in the ground and excited states of [Gd2@C78]− and [Gd2@C80]−

2017

The magnetic properties and electronic structure of the ground and excited states of two recently characterized endohedral metallo-fullerenes, [Gd2@C78]- (1) and [Gd2@C80]- (2), have been studied by theoretical methods. The systems can be considered as [Gd2]5+ dimers encapsulated in a fullerene cage with the fifteen unpaired electrons ferromagnetically coupled into an S = 15/2 high-spin configuration in the ground state. The microscopic mechanisms governing the Gd-Gd interactions leading to the ferromagnetic ground state are examined by a combination of density functional and ab initio calculations and the full energy spectrum of the ground and lowest excited states is constructed by means …

Speciālās leksikas tulkošanas problēmas galda lomu spēlē ''Dungeons and Dragons''

2018

Maģistra darbā “Speciālās leksikas tulkošanas problēmas galda lomu spēlē Dungeons & Dragons” aplūkota spēlē Dungeons & Dragons sastopamā speciālā leksika un ar tās tulkošanu saistītās problēmas. Darba teorētiskajā daļā ir apkopota informācija par jēdzienu “spēle” un vairākiem spēļu veidiem, sniegts ieskats spēles Dungeons & Dragons vēsturē un tās galvenajos elementos, kā arī apkopota informācija par speciālo leksiku un tai atbilstošajām tulkošanas stratēģijām. Darba praktiskajā daļā ir analizēts autores piedāvātais spēlētāja tēla raksturojuma terminu tulkojums un aprakstītas darba gaitā novērotās tulkošanas problēmas.

Svensklärare och elevernas dyslexi

2010

Tässä tutkielmassa tutkitaan ruotsinopettajien valmiuksia kohdata oppilaita, joilla on dysleksia. Lisäksi tutkielmassa tarkastellaan opettajankoulutuksen mahdollisia vaikutuksia tähän valmiuteen. Tutkielmassa käytetään sekä kvantitatiivisia, että kvalitatiivisia metodeja. Aineistonkeruu suoritettiin kyselylomakkeilla, jotka sisälsivät sekä strukturoituja-, että avoimia kysymyksiä. Strukturoidut kysymykset käsiteltiin kvantitatiivisesti ja avoimet kysymykset kvalitatiivisesti. Kyselyyn osallistui yhteensä 17 vastaajaa. Vastaajat koostuivat opettajista, jotka ovat suorittaneet opettajankoulutuksen auskultoinnin vuosien 1972-2005 välillä. Tulokset osoittivat, että suurimmalla osalla opettajist…

Children at risk for dyslexia show deficient left-hemispheric memory representations for new spoken word forms

2021

Developmental dyslexia is a specific learning disorder with impairments in reading and spelling acquisition. Apart from literacy problems, dyslexics show inefficient speech encoding and deficient novel word learning, with underlying problems in phonological processing and learning. These problems have been suggested to be related to deficient specialization of the left hemisphere for language processing. To examine this possibility, we tracked with magnetoencephalography (MEG) the activation of the bilateral temporal cortices during formation of neural memory traces for new spoken word forms in 7–8-year-old children with high familial dyslexia risk and in controls. The at-risk children impr…