Search results for "Oran"
showing 5 items of 2425 documents
Synthesis, Characterization, and Properties of Weakly Coordinating Anions Based on tris-Perfluoro-tert-Butoxyborane
2017
Abstract Image A convenient method for the preparation of strongly Lewis acidic tris-perfluoro-tert-butoxyborane B(ORF)3 (1), (ORF = OC(CF3)3) was developed, and its X-ray structure was determined. 1 was used as a precursor, guided by density functional theory (DFT) calculations and volume-based thermodynamics, for the synthesis of [NEt4][NCB(ORF)3] (3) and [NMe4][FB(ORF)3] (5) and the novel large and weakly coordinating anion salts [Li 15-Crown-5][B(ORF)4] (2) and [NEt4][CN{B(ORF)3}2] (4). The stability of [B(ORF)4]− was compared with that of some related known weakly coordinating anions by appropriate DFT calculations. peerReviewed
Hydrogels for Three-Dimensional Ionizing-Radiation Dosimetry
2021
Radiation-sensitive gels are among the most recent and promising developments for radiation therapy (RT) dosimetry. RT dosimetry has the twofold goal of ensuring the quality of the treatment and the radiation protection of the patient. Benchmark dosimetry for acceptance testing and commissioning of RT systems is still based on ionization chambers. However, even the smallest chambers cannot resolve the steep dose gradients of up to 30–50% per mm generated with the most advanced techniques. While a multitude of systems based, e.g., on luminescence, silicon diodes and radiochromic materials have been developed, they do not allow the truly continuous 3D dose measurements offered by radiation-se…
"Kerran mä löin yhtä turpaan, niin sitte mä sain siitä heti jälkkärin!" : kurinpito oppilaan kokemana
2006
«L’ORDRE DANS LE MOUVEMENT». DAL SEMPIONE STRIZZA L’OCCHIO AL FREJUS AL BARBIERE DI CARLO MARX. GENESI ED EDIZIONI DIGITALI DI DUE INCOMPIUTI DI ELIO…
2020
Darba vides riski nodarbinātajiem ķīmijas laboratorijās, preventīvie pasākumi
2019
“Darba vides risku iedarbība uz nodarbinātajiem ķīmijas laboratorijās, preventīvie pasākumi”. Darba autore: O. Korņejeva. Darba zinātniskais vadītājs: asoc. prof. Dr. sc. admin. H. Kaļķis. Darbs izklāstīts uz 90 lpp., ietver 31 attēlu, 18 tabulas, 13 pielikumus, 67 informatīvos avotus. Pētījums sastāv no 4 daļām. Pirmajā daļā ir apkopota un analizēta literatūra par ķīmijas laboratoriju nodarbināto profesijām un par izplatītākajiem darba vides riskiem, kuriem tie ir pakļauti veicot savus ikdienas darba pienākumus, kā arī risku iedarbība uz veselību. Otrajā daļā ir aprakstītas pētījumā pielietotas risku analīzes metodes. Trešajā daļā ir apkopota un atspoguļota iegūto rezultātu analīze. Iegūti…