Search results for "SELE"
showing 10 items of 4721 documents
Biological adaptation in light of the Lewontin–Williams (a)symmetry
2022
Neo-Darwinism characterises biological adaptation as a one-sided process, in which organisms adapt to their environment but not vice versa. This asymmetric relationship – here called Williams’ asymmetry – is called into question by Niche Construction Theory, which emphasises that organisms and their environments often mutually affect each other. Here we clarify that Williams’ asymmetry is specifically concerned with (quasi-) directed modifications towards phenotypes that increase individual fitness. This directedness – which drives the adaptive fit between organism and environment – entails far more than the mere presence of cause-effect relationships. We argue that difficulties with invoki…
Signal processing techniques for robust sound event recognition
2019
The computational analysis of acoustic scenes is today a topic of major interest, with a growing community focused on designing machines capable of identifying and understanding the sounds produced in our environment, similar to how humans perform this task. Although these domains have not reached the industrial popularity of other related audio domains, such as speech recognition or music analysis, applications designed to identify the occurrence of sounds in a given scenario are rapidly increasing. These applications are usually limited to a set of sound classes, which must be defined beforehand. In order to train sound classification models, representative sets of sound events are record…
Intelligent solutions for real-life data-driven applications
2017
The subject of this thesis belongs to the topic of machine learning or, specifically, to the development of advanced methods for regression analysis, clustering, and anomaly detection. Industry is constantly seeking improved production practices and minimized production time and costs. In connection to this, several industrial case studies are presented in which mathematical models for predicting paper quality were proposed. The most important variables for the prediction models are selected based on information-theoretic measures and regression trees approach. The rest of the original papers are devoted to unsupervised machine learning. The main focus is developing advanced spectral cluster…
Two new organic-selenate salts: syntheses and crystal structures of bis(di-iso-propylammonium) selenate and di-n-butylammonium hydrogenoselenate
2017
Abstract Two new dialkyammonium selenate salts [i-Pr2NH2]2[SeO4] (1) and [n-Bu2NH2][HSeO4] (2) have been isolated and characterized by single-crystal X-ray diffraction. Salt 1 crystallizes in the monoclinic system, space group P21/n with a=8.7190(5), b=8.8500(4), c=22.5953(9) Å, β=94.6290(17)°, V=1737.84(14) Å3 and Z=4. Salt 2 crystallizes in the monoclinic system space group P21/n with a=10.9328(9), b=8.1700(6), c=13.8095(11) Å, β=97.130(3)°, V=1223.94(17) Å3 and Z=4. In both salts, dialkylammonium cations and selenate anions are connected through NH···O and OH···O hydrogen bonds. In the crystal structure, 1 and 2 are organized in layer-like arrangements. Structural characterizations were …
Hloramfenikola selektīvā spiediena ietekme uz acetiltransferāzes gēna aktivēšanu pAdCat plazmīdā Escherichi coli kultūras stacionārā fāzē
2015
IS10 ir viens no aktīvākajiem transpozoniem, kas nodrošina adapatīvo mutaģenēzi baktērijām, aktivizējot neekspresējošus gēnus. Darba mērķis bija noskaidrot hloramfenikola selektīvā spiediena ietekmi uz IS10 elementa spēju efektīvāk aktivizēt bezpromotera acetiltransferāzes (cat) gēnu pAdCat plazmīdā Escherichia coli kultūras stacionārā augšanas fāzē. Baktēriju celmi tika transformēti ar pAdCat plazmīdu, kas kalpo par vektoru-lamatu IS10 elementu izolēšanai pēc pozitīvās selekcijas principa. Šūnām, atrodoties trīs dienas stacionārajā fāzē, novēroja IS10 transpozīciju un bezpromotera hloramfenikola acetiltransferāzes (cat) gēna aktivizēšanu. Gēna aktivizēšanu nodrošināja gan IS10R, gan IS10H.…
Jurisdikcijas noteikšana pārrobežu strīdos civillietās un komerclietās pēc saistību izpildes vietas
2019
Latvijas nacionālajās tiesībās pretēji Eiropas Savienības tiesību aktiem, kas regulē jurisdikcijas noteikšanu, nav paredzētas tiesības prasītājiem celt tiesā prasību civillietā, kas attiecas uz līguma izpildi, pēc saistību izpildes vietas. Tādējādi regulās paredzēts lielāks tiesību apjoms nekā Latvijas nacionālajā likumā, līdz ar ko netiek nodrošināta efektīva kārtība jurisdikcijas noteikšanai civillietās, kurās jurisdikcija nosakāma saskaņā ar nacionālajām procesuālajām normām. Tādēļ darbā piedāvāti konkrēti grozījumi Civilprocesa likumā, proti, nacionālais likums papildināms ar normām, nodrošinot Latvijā domicilētiem prasītājiem līdzvērtīgu tiesību apjomu gadījumos, kad atbildētājs nav do…
Efficient regio- and stereoselective access to novel fluorinated ?-aminocyclohexanecarboxylates
2013
A regio- and stereoselective method has been developed for the synthesis of novel fluorinated 2-aminocyclohexanecarboxylic acid derivatives with the fluorine attached to position 4 of the ring. The synthesis starts from either cis- or trans-β-aminocyclohex-4-enecarboxylic acids and involves regio- and stereoselective transformation of the ring C–C double bond through iodooxazine formation and hydroxylation, followed by hydroxy–fluorine or oxo–fluorine exchange.
Conception de documents numériques : Parcours méthodologique
2009
There is a strong social demand for studies of digital document. Yet our models of society and education are struggling to integrate issues related to these types of documents. However, the subject is less than half a century old, and so it is hardly surprising that the writing and training practices are just being developed. Like the book, the digital document involves many different skills and techniques in its development. The list of jobs tends to grow steadily: ergonomists, referencing specialists, information architects, programmers, designers, integrators ... It is therefore difficult to have a global view on all this know-how and the related methodologies. This special edition seeks…
Multiple mini-interviews as a selection tool for initial teacher education admissions
2022
This study investigates the reliability of multiple mini interviews (MMIs) to select students for classroom and special education teacher programs (n = 418) using intraclass correlations and cross-classified multilevel modeling. The results indicated mostly small effects of clustering of applicants to different interviewers and five-station circuits. The largest variance components in the MMI total score were for applicants (63.3%) and measurement error (20.6%), while the variance component for the interviewer was relatively small (11.6–14.4%). The applicants' and interviewers' perceptions were positive. This study provides evidence for the use of MMIs as a reliable tool for initial teacher…
Titanocene Selenide Sulfides Revisited: Formation, Stabilities, and NMR Spectroscopic Properties
2019
[TiCp2S5] (phase A), [TiCp2Se5] (phase F), and five solid solutions of mixed titanocene selenide sulfides [TiCp2SexS5−x] (Cp = C5H5−) with the initial Se:S ranging from 1:4 to 4:1 (phases B–E) were prepared by reduction of elemental sulfur or selenium or their mixtures by lithium triethylhydridoborate in thf followed by the treatment with titanocene dichloride [TiCp2Cl2]. Their 77Se and 13C NMR spectra were recorded from the CS2 solution. The definite assignment of the 77Se NMR spectra was based on the PBE0/def2-TZVPP calculations of the 77Se chemical shifts and is supported by 13C NMR spectra of the samples. The following complexes in varying ratios were identified in the CS2 solutions of …