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    Authors: Bondars, K;

    Kopš seniem laikiem mūra konstrukcijas būvētas pēc laikā un praksē pārbaudītām metodēm un proporcijām. Ekspluatācijas laikā mūra materiāla degradācija, pārslodze, dinamiskās iedarbes, balsta konstrukciju sēšanās, kā arī to radītās deformācijas mūra plaknē un perpendikulāri tai, var izsaukt mūra konstrukcijas sagruvumu. Lai definētu vēsturisku ēku drošas ekspluatācijas robežas, ir noteikti mūra daļu pārvietojumi, kas neapdraud konstrukcijas noturību. Balstu deformāciju izraisīta plaisu attīstība, ievērojami maina spiedes spēka ass novietojumu šķērsgriezumā un izveido rotācijas punktus, kurus uzskata par locīklām. Vēsturisko ēku pamatu konstrukciju sēšanās ir par iemeslu plaisu attīstībai velvju pārsegumos un locīklas mehānisma izveidei. Velvju daļu savstarpējā mijiedarbība jādefinē kā virsmu kontakts, ievērtējot berzes komponenti, jo plaisājušu velvju droša ekspluatācija iespējama arī pēc caurejošu plaisu izveidošanās. Deformētā konstrukciju modeļa izveidei un analīzes aprobācijai izmantots Rīgas Doma baznīcas vertikālo konstrukciju un pārseguma modelis. Būvkonstrukciju analīzei izmantoti „inversās inženierijas” (reverse engineering) principi, veicot uzmērīšanu ar virsmu lāzerskanēšanas metodi un konstrukcijas analizējot ar būvkonstrukciju datoraprēķina programmām. Promocijas darbā secīgi apvienotas metodes, lai varētu analizēt esošu mūra ēku velvju pārsegumus. Metožu kopums sastāv no: a) vēsturisko mūra ēku velvju virsmu trīsdimensiju lāzerskanēšanas ar uzmērījumu transformāciju tīkla modelī; b) skaitliskas virsmas modeļa izveides, apstrādes un tā transformācijas būvkonstrukciju datoraprēķina programmās; c) mūra materiālu stiprības un elastīgo īpašību testa metožu atlases vēsturisko mūra materiālu īpašību noteikšanai; d) testos iegūto mūra materiāla īpašību apstrādes un homogenizēta mūra raksturlielumu pielietošanas datoraprēķinu programmās; e) vēsturisko ēku deformēto konstrukciju analīzes un korelācijas ar plaisu monitoringa datiem; f) velvju pārseguma nevienmērīgas balstu deformācijas efektu analīzes un esošu mūra pārsegumu drošas ekspluatācijas kritēriju izstrādes. Piedāvātais metožu kopums nodrošina vēsturisko mūra ēku deformēto konstrukciju analīzi, lai noteiktu drošas ekspluatācijas robežas. Izstrādātais metožu kopums ietver samazinātas laikietilpības ģeometrisko virsmu uzmērīšanas metodi un analīzes datormodeļa izveidi, pielietojot „inversās inženierijas” metodi un deformēto konstrukciju datoranalīzi, izmantojot tirgū plaši pieejamas būvkonstrukciju datoranalīzes programmas. Promocijas darbā korelētas velvju plaisu atvēruma izmaiņas ar pamatu nevienmērīgiem pārvietojumiem. Izmantojot Rīgas Doma baznīcas plaisu monitoringa sistēmas datus, analizēta temperatūras slogojuma, vēja, sniega un citu ekspluatācijas slodžu ietekme. Pamatojoties uz apvienoto mūra konstrukciju analīzes metožu kopumu, izstrādāts esošu mūra pārseguma konstrukciju drošas ekspluatācijas kritērijs. Darbā iekļauti 70 attēli, 6 tabulas un sniegtas atsauces uz 153 literatūras avotiem.

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    Authors: Petrovska, Kristīne;

    In the first chapter of the dissertation the essence un interpretations of the systemic risk is explored, identification and analysis of factors that contribute to the systemic risk is done, including, distinguishing system agents and their interests that facilitate the increase in systemic risk level. The role of the systemic risk in contributing to the financial crisis is also explored, as well as the costs and benefits of the regulatory framework of the systemic risk are analysed. In the second chapter of the dissertation various systemic risk evaluation models and their disadvantages are examined, including on accounting data based models, on market data based models, network models, combined models. The second chapter ends with the rationale for the evaluation model of the indirect interconnectedness aspect of the systemic risk that is applicable to banking sectors in the Baltic countries. Whereas, in the third chapter of the dissertation the development and specifics of the Baltic banking systems are investigated, the methodological aspects of the model are set, and results are presented. As well as robustness checks are performed using alternative methods to analyse systemic risk. Keywords: systemic risk, indirect interconnectedness, banking system Promocijas darba pirmajā daļā tiek izpētīta sistēmiskā riska būtība un interpretācijas, tiek veikta sistēmiskā riska veicinošo faktoru identificēšana un analīze. Tiek arī noteikta sistēmiskā riska loma finanšu krīzes veicināšanā, kā arī analizēti sistēmiskā riska pārvaldīšanas regulatīvā ietvara ieguvumi un trūkumi. Promocijas darba otrajā daļā tiek pētīti dažādi sistēmiskā riska novērtēšanas modeļi un to trūkumi, un tiek veikts Baltijas banku nozares sistēmiskā riska aspekta – netiešās savstarpējās saiknes – novērtēšanas modeļa izstrādes pamatojums. Promocijas darba trešajā daļā tiek izpētīta Baltijas valstu banku sistēmu attīstība un specifika, tiek noteikti modeļa metodoloģiskie aspekti un sniegti modeļa rezultāti, kā arī veikts kritisks modeļa rezultātu novērtējums, izmantojot alternatīvas sistēmiskā riska analīzes metodes. No modeļa rezultātiem tiek secināts, ka Latvijas banku nozarē starp bankām pastāv visciešākā sasaiste. Atslēgvārdi: sistēmiskais risks, netiešās savstarpējās saiknes, banku sistēma.

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    Authors: Studente, Aija;

    Promocijas darba mērķis ir pētīt vispārizglītojošā internātpamatskolā dzīvojošo pusaudžu dzīvesdarbības prasmes un izstrādāt teorētiski pamatotu pedagoģiskās darbības modeli dzīvesdarbības prasmju apguvei, to eksperimentāli pārbaudīt. Pētījuma aktualitāti nosaka fakts, ka internātpamatskolas pedagoģiskais process nav pētīts, internātskolu praksē nav konsekventas izpratnes par to, kā dzīvesdarbības prasmju apguvi savienot ar mācību un audzināšanas procesu, kā arī teorētiski pamatotu un empīriski pārbaudītu dzīvesdarbības prasmju apguves kritēriju un rādītāju nepieciešamība skolu (internātpamatskolu) pedagoģijas teorijā un praksē. Promocijas darbā autore analizē darbības, dzīvesdarbības būtību un konkretizē jēdzienu dzīvesdarbības prasmes. Uz zinātniskās literatūras analīzes pamata atklāta dzīvesdarbības prasmju veidošanās darbībā, tās objektīvie un subjektīvie komponenti, pamatojot dzīvesdarbības prasmju nepieciešamību internātpamatskolā, kas nosaka tālāko skolēnu sekmīgu dzīvesdarbību. Definēti subjektīvie sekmīgu dzīvesdarbību veicinošie faktori: motivētība, mērķtiecība, patstāvība, pašattīstība. Promocijas darbā atklāti pedagoģiskie nosacījumi pusaudžu dzīvesdarbības prasmju sekmīgai attīstībai vispārizglītojošas internātpamatskolas pedagoģiskajā procesā. Pētījuma gaitā izstrādāta un empīriski pārbaudīta dzīvesdarbības prasmju veidošanās procesuālā struktūra, dzīvesdarbības prasmju kritēriji un rādītāji. Izveidots teorētiski pamatots dzīvesdarbības prasmju apguves modelis pusaudžiem, noteikti tā nozīmīgākie struktūrkomponenti, akcentējot ģimeniskuma un sadarbības nozīmi. Empīriskā pētījuma rezultāti apstiprina aizvirzīto hipotēzi par dzīvesdarbības prasmju apguvi internātpamatskolas pedagoģiskajā procesā. Pētījuma bāzi veido Balvu novada Tilžas internātpamatskolas, Liepājas novada Vaiņodes internātpamatskolas, Alūksnes novada Liepnas internātpamatskolas un Jēkabpils novada Biržu internātpamatskolas 140 skolēni un 69 skolotāji. Promocijas darbu veido divas daļas, nobeigums, literatūras saraksts un pielikumi. Darba pamatteksts izklāstīts uz 156 lappusēm, to ilustrē 36 attēli, 9 tabulas. Literatūras un avotu sarakstā iekļauti 307 izdevumu nosaukumi latviešu, krievu, angļu un vācu valodās. Pievienots 21 pielikums. Atslēgvārdi: darbība, dzīvesdarbība, prasmes, dzīvesdarbības prasmes, internātpamatskolas pedagoģiskais process. The goal of the PhD dissertation is to study the lifeskills of adolescents living in a general boarding elementary school and to develop theoretically based pedagogical operating model for acquisition of lifeskills, and to examine it experimentally. Topicality of the research has been determined by the fact that the pedagogical process of the boarding elementary school has not been researched yet; there is no consequent understanding, how to relate acquisition of lifeskills with learning and upbringing process, as well as the necessity of theoretically based and empirically examined criteria and indicators of lifeskills’ acquisition in the pedagogical theory and practice of schools (boarding elementary schools). The author of the PhD dissertation analyses nature of activity, lifeskills activity and specifies the notion of lifeskills. Building of lifeskills in actions, its objective and subjective components are discovered on the basis of scientific literature analysis by justifying the necessity of lifeskills at boarding elementary school, which determines further successful life activities of pupils. The following subjective contributing factors of lifeskills have been defined: motivatedness, purposefulness, self-independence, self-development. In the PhD dissertation pedagogical conditions for successful development of adolescents’ lifeskills in the pedagogical process of general boarding elementary school are discovered. During the research period the procedural structure of lifeskills’ building has been developed and empirically examined, as well as criteria and indicators of lifeskills. Theoretically-based model for acquisition of lifeskills for adolescents has been created; the most significant structural components emphasizing importance of family and cooperation has been determined. Results of empirical research approve the stated hypothesis about acquisition of lifeskills in the pedagogical process of boarding elementary school. Research base consists of 140 pupils and 69 teachers of Balvi Municipality Tilža Boarding Elementary School, Alūksne Municipality Liepna Boarding Elementary School and Jēkabpils Municipality Biržu Boarding Elementary School.

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    Authors: Aleksejeva, Inese;

    Goal of Inese Aleksejeva’s doctoral thesis „Latvian consumers’ attitude towards use of genetically modified organisms” is to assess Latvian consumers’ attitude towards use of genetically modified organisms (GMO) in food and other industries, to identify main factors influencing Latvian consumers’ attitude towards GMO and to provide the proposals for the most appropriate form of marketing communication with consumers on GMO issues. In the frame of the thesis an analysis of consumers’ attitude towards GMO in other countries was made and an assessment of the formation of the consumers’ opinion and of the factors influencing it was provided; a comparative analysis of attitude towards GMO between Latvian and other countries’ consumers was carried out; perspevtives of GMO development were assessed and the potential benefits and risks that may result from the use of GMO were evaluated. In the first chapter of the thesis the author analyzed GMO development perspectives, studied the history and use of GMO in food, feed, agriculture and other industries, assessed the possible risks and benefits of GMO to human and animal health, and the environment, provided an analysis of the socio-economic risks and benefits as well as performed an analysis of the EU and Latvian normative acts in the field of GMO. In the second chapter the author focused on the theory of consumers’ attitude and analyzed most popular consumers’ attitude assessment models; evaluated in-depth consumers’ attitude towards use of GMO in food, feed and other industries, identified the key factors affecting consumers’attitude as well as analyzed the role of marketing communications in shaping of consumers’ attitude towards GMO. In the third chapter the author analyzed the empirical results of the surveys carried out among the EU experts and Latvian consumers in terms of attitude towards use of GMO as well as developed consumers’ attitude towards GMO model and provided the proposals for information communication with consumers on GMO issues. The dissertation contains 200 pages, illustrated with 25 images and 29 tables. The bibliography includes 358 literary sources, 7 appendices added. Keywords: benefits, consumers’ attitude, consumers influencing factors, genetically modified organism, marketing communications, risks. Ineses Aleksejevas promocijas darba „Latvijas patērētāju attieksme pret ģenētiski modificētiem organismiem” mērķis ir izvērtēt Latvijas patērētāju attieksmi pret ģenētiski modificēto organismu (ĢMO) izmantošanu pārtikā un citās tautsaimniecības nozarēs, identificēt galvenos Latvijas patērētāju attieksmi pret ĢMO veidojošos faktorus un sniegt priekšlikumus par piemērotāko mārketinga komunikācijas veidu ar patērētājiem par ĢMO jomas jautājumiem. Promocijas darbā tika veikta analīze arī par citu valstu patērētāju attieksmi pret ĢMO, par to, kā veidojas šī attieksme un kādi faktori to ietekmē, veikta salīdzinošā analīze par Latvijas un citu pasaules valstu patērētāju attieksmi pret ĢMO, izvērtētas ĢMO attīstības perspektīvas, kā arī iespējamie ĢMO izmantošanas ieguvumi un iespējamie riski, Promocijas darba pirmajā nodaļā autore pievērsusies padziļinātai ĢMO attīstības perspektīvu analīzei, izpētījusi ĢMO attīstības vēsturi un izmantošanu pārtikā, dzīvnieku barībā, lauksaimniecībā un citās tautsaimniecības nozarēs, izvērtējusi ĢMO iespējamos riskus un ieguvumus cilvēku un dzīvnieku veselībai un videi, sniegusi analīzi par sociālekonomiskajiem riskiem un ieguvumiem, kā arī analizējusi ĢMO apriti regulējošos ES un Latvijas normatīvos aktus. Otrajā nodaļā autore analizējusi patērētāju attieksmi un tās vērtēšanas modeļus, sīkāk pētījusi patērētāju attieksmi pret ĢMO izmantošanu pārtikā, dzīvnieku barībā un citās tautsaimniecības nozarēs, identificējusi galvenos faktorus, kas ietekmē šo attieksmi, kā arī analizējusi mārketinga komunikāciju lomu patērētāju attieksmes pret ĢMO veidošanā. Trešajā nodaļā autore devusi ES ekspertu un Latvijas patērētāju attieksmes pret ĢMO aptaujas empīrisko rezultātu analīzi, izstrādājusi patērētāju attieksmes pret ĢMO modeli un priekšlikumus informācijas komunikācijai šajā jautājumā. Promocijas darba saturs izklāstīts uz 200 lapaspusēm, ilustrēts ar 25 attēliem un 29 tabulām. Literatūras sarakstā iekļauts 358 literatūras avots. Darbam pievienoti 7 pielikumi. Atslēgvārdi: ģenētiski modificēts organisms, ieguvumi, patērētāju attieksme, patērētāju attieksmi ietekmējošie faktori, mārketinga komunikācijas, riski.  Elektroniskā versija nesatur pielikumus

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    Authors: Cerūzis, Raimonds; Latvijas Universitāte. Vēstures un filozofijas fakultāte;

    Advisor: Feldmanis, Inesis

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    Authors: Siņenko, Nadežda;
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    Authors: Platoņenko, Aleksandrs;

    Radiation-induced changes in the properties of are mainly associated with oxygen vacancies and interstitial defects. While oxygen vacancies are well studied, the interstitial oxygen atom has not been described in detail both experimentally and theoretically until now. Using ab initio modelling code CRYSTAL17, radiation point defects in two materials were investigated, their recombination energy barriers were estimated. The application of Raman spectroscopy for defect identification was also proposed. In MgAl2O4 the EPR parameters of various antisite and cation vacancy defects were calculated. Efficient comparison of the calculated and experimental results allowed a deeper understanding of the behavior of Al2O3 and MgAl2O4 point defects, which can be extended to the wider range of oxides. Radiācijas izraisītas izmaiņas α-Al2O3 un MgAl2O4 īpašībās ir galvenokārt saistītas ar skābekļa vakancēm un starpmezglu defektiem. Kamēr skābekļa vakances ir labi izpētītas, starpmezglu skābekļa atoms līdz šīm nebija detalizēti aprakstīts gan eksperimentāli, gan teorētiski. Izmantojot ab initio modelēšanas kodu CRYSTAL17, darbā tika izpētīti radiācijas defekti divos materiālos, noteikta to rekombinācijas enerģijas barjera. Tika piedāvāta arī Ramana spektroskopijas pielietošana defektu identificēšanai. MgAl2O4 tika aprēķināti dažādu antisaitu un katjonu vakances defektu EPR parametri. Efektīvs aprēķinu un eksperimentālo rezultātu salīdzinājums ļāva dziļāk izprast Al2O3 un MgAl2O4 punktu defektu uzvedību, kas var būt attiecināms arī uz plašāko oksīdu klāstu

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    Authors: Berenis, Didzis;

    This thesis investigates a rotating permanent magnet (RPM) generated turbulent flow in a closed volume. Analytical, experimental, and numerical approaches are employed. The force generated by the RPM in a conducting cylinder or ring is solved using elliptic integrals. A simplified analytical solution incorporates radial dependency of the driving force to calculate flow velocity in a cylinder. Analytical solution agrees with experiments and numerical simulations using OpenFOAM and Elmer. The thesis also explores RPM generated radial jet instability in a ring channel, leading to bistability. The jet chaotically switches between leaning up or down for long intervals, which poses challenges for turbulence models. The bistability is observed experimentally in a transparent electrolyte ring, although not as convincingly as in simulations. Promocijas darbā ir veikts analītisks, skaitlisks un eksperimentāls pētījums par rotējošu pastāvīgo magnētu (RPM) ierosinātām turbulentām plūsmām slēgtos traukos. Izmantojot eliptiskos integrāļus ir iegūts RPM inducētais spēks elektrovadošos cilindros un gredzenos. Iegūts vienkāršots analītiskais atrisinājums ar dzenošā spēka radiālo atkarību, lai aprēķinātu plūsmas ātrumu cilindrā. Analītiskais atrisinājums sakrīt ar eksperimentiem un ar OpenFOAM un Elmer skaitliskajām simulācijām. Pētīta arī RPM ierosinātās radiālās strūklas nestabilitāte gredzena kanālā, kura noved pie bistabilitātes. Strūkla haotiski pārslēdzas starp ilglaicīgi noliegtu augšup vai lejup, kas var radīt problēmas turbulences modeļiem. Eksperimentāli bistabilitāte ir novērota gredzenā ar caurspīdīgu elektrolītu, taču ne tik pārliecinoši kā skaitliskajā simulācijā.

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    Authors: Mārtinsone, Kristīne; Latvijas Universitāte;
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    Authors: Penēze, Zanda;
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    Authors: Bondars, K;

    Kopš seniem laikiem mūra konstrukcijas būvētas pēc laikā un praksē pārbaudītām metodēm un proporcijām. Ekspluatācijas laikā mūra materiāla degradācija, pārslodze, dinamiskās iedarbes, balsta konstrukciju sēšanās, kā arī to radītās deformācijas mūra plaknē un perpendikulāri tai, var izsaukt mūra konstrukcijas sagruvumu. Lai definētu vēsturisku ēku drošas ekspluatācijas robežas, ir noteikti mūra daļu pārvietojumi, kas neapdraud konstrukcijas noturību. Balstu deformāciju izraisīta plaisu attīstība, ievērojami maina spiedes spēka ass novietojumu šķērsgriezumā un izveido rotācijas punktus, kurus uzskata par locīklām. Vēsturisko ēku pamatu konstrukciju sēšanās ir par iemeslu plaisu attīstībai velvju pārsegumos un locīklas mehānisma izveidei. Velvju daļu savstarpējā mijiedarbība jādefinē kā virsmu kontakts, ievērtējot berzes komponenti, jo plaisājušu velvju droša ekspluatācija iespējama arī pēc caurejošu plaisu izveidošanās. Deformētā konstrukciju modeļa izveidei un analīzes aprobācijai izmantots Rīgas Doma baznīcas vertikālo konstrukciju un pārseguma modelis. Būvkonstrukciju analīzei izmantoti „inversās inženierijas” (reverse engineering) principi, veicot uzmērīšanu ar virsmu lāzerskanēšanas metodi un konstrukcijas analizējot ar būvkonstrukciju datoraprēķina programmām. Promocijas darbā secīgi apvienotas metodes, lai varētu analizēt esošu mūra ēku velvju pārsegumus. Metožu kopums sastāv no: a) vēsturisko mūra ēku velvju virsmu trīsdimensiju lāzerskanēšanas ar uzmērījumu transformāciju tīkla modelī; b) skaitliskas virsmas modeļa izveides, apstrādes un tā transformācijas būvkonstrukciju datoraprēķina programmās; c) mūra materiālu stiprības un elastīgo īpašību testa metožu atlases vēsturisko mūra materiālu īpašību noteikšanai; d) testos iegūto mūra materiāla īpašību apstrādes un homogenizēta mūra raksturlielumu pielietošanas datoraprēķinu programmās; e) vēsturisko ēku deformēto konstrukciju analīzes un korelācijas ar plaisu monitoringa datiem; f) velvju pārseguma nevienmērīgas balstu deformācijas efektu analīzes un esošu mūra pārsegumu drošas ekspluatācijas kritēriju izstrādes. Piedāvātais metožu kopums nodrošina vēsturisko mūra ēku deformēto konstrukciju analīzi, lai noteiktu drošas ekspluatācijas robežas. Izstrādātais metožu kopums ietver samazinātas laikietilpības ģeometrisko virsmu uzmērīšanas metodi un analīzes datormodeļa izveidi, pielietojot „inversās inženierijas” metodi un deformēto konstrukciju datoranalīzi, izmantojot tirgū plaši pieejamas būvkonstrukciju datoranalīzes programmas. Promocijas darbā korelētas velvju plaisu atvēruma izmaiņas ar pamatu nevienmērīgiem pārvietojumiem. Izmantojot Rīgas Doma baznīcas plaisu monitoringa sistēmas datus, analizēta temperatūras slogojuma, vēja, sniega un citu ekspluatācijas slodžu ietekme. Pamatojoties uz apvienoto mūra konstrukciju analīzes metožu kopumu, izstrādāts esošu mūra pārseguma konstrukciju drošas ekspluatācijas kritērijs. Darbā iekļauti 70 attēli, 6 tabulas un sniegtas atsauces uz 153 literatūras avotiem.

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    Authors: Petrovska, Kristīne;

    In the first chapter of the dissertation the essence un interpretations of the systemic risk is explored, identification and analysis of factors that contribute to the systemic risk is done, including, distinguishing system agents and their interests that facilitate the increase in systemic risk level. The role of the systemic risk in contributing to the financial crisis is also explored, as well as the costs and benefits of the regulatory framework of the systemic risk are analysed. In the second chapter of the dissertation various systemic risk evaluation models and their disadvantages are examined, including on accounting data based models, on market data based models, network models, combined models. The second chapter ends with the rationale for the evaluation model of the indirect interconnectedness aspect of the systemic risk that is applicable to banking sectors in the Baltic countries. Whereas, in the third chapter of the dissertation the development and specifics of the Baltic banking systems are investigated, the methodological aspects of the model are set, and results are presented. As well as robustness checks are performed using alternative methods to analyse systemic risk. Keywords: systemic risk, indirect interconnectedness, banking system Promocijas darba pirmajā daļā tiek izpētīta sistēmiskā riska būtība un interpretācijas, tiek veikta sistēmiskā riska veicinošo faktoru identificēšana un analīze. Tiek arī noteikta sistēmiskā riska loma finanšu krīzes veicināšanā, kā arī analizēti sistēmiskā riska pārvaldīšanas regulatīvā ietvara ieguvumi un trūkumi. Promocijas darba otrajā daļā tiek pētīti dažādi sistēmiskā riska novērtēšanas modeļi un to trūkumi, un tiek veikts Baltijas banku nozares sistēmiskā riska aspekta – netiešās savstarpējās saiknes – novērtēšanas modeļa izstrādes pamatojums. Promocijas darba trešajā daļā tiek izpētīta Baltijas valstu banku sistēmu attīstība un specifika, tiek noteikti modeļa metodoloģiskie aspekti un sniegti modeļa rezultāti, kā arī veikts kritisks modeļa rezultātu novērtējums, izmantojot alternatīvas sistēmiskā riska analīzes metodes. No modeļa rezultātiem tiek secināts, ka Latvijas banku nozarē starp bankām pastāv visciešākā sasaiste. Atslēgvārdi: sistēmiskais risks, netiešās savstarpējās saiknes, banku sistēma.

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    Authors: Studente, Aija;

    Promocijas darba mērķis ir pētīt vispārizglītojošā internātpamatskolā dzīvojošo pusaudžu dzīvesdarbības prasmes un izstrādāt teorētiski pamatotu pedagoģiskās darbības modeli dzīvesdarbības prasmju apguvei, to eksperimentāli pārbaudīt. Pētījuma aktualitāti nosaka fakts, ka internātpamatskolas pedagoģiskais process nav pētīts, internātskolu praksē nav konsekventas izpratnes par to, kā dzīvesdarbības prasmju apguvi savienot ar mācību un audzināšanas procesu, kā arī teorētiski pamatotu un empīriski pārbaudītu dzīvesdarbības prasmju apguves kritēriju un rādītāju nepieciešamība skolu (internātpamatskolu) pedagoģijas teorijā un praksē. Promocijas darbā autore analizē darbības, dzīvesdarbības būtību un konkretizē jēdzienu dzīvesdarbības prasmes. Uz zinātniskās literatūras analīzes pamata atklāta dzīvesdarbības prasmju veidošanās darbībā, tās objektīvie un subjektīvie komponenti, pamatojot dzīvesdarbības prasmju nepieciešamību internātpamatskolā, kas nosaka tālāko skolēnu sekmīgu dzīvesdarbību. Definēti subjektīvie sekmīgu dzīvesdarbību veicinošie faktori: motivētība, mērķtiecība, patstāvība, pašattīstība. Promocijas darbā atklāti pedagoģiskie nosacījumi pusaudžu dzīvesdarbības prasmju sekmīgai attīstībai vispārizglītojošas internātpamatskolas pedagoģiskajā procesā. Pētījuma gaitā izstrādāta un empīriski pārbaudīta dzīvesdarbības prasmju veidošanās procesuālā struktūra, dzīvesdarbības prasmju kritēriji un rādītāji. Izveidots teorētiski pamatots dzīvesdarbības prasmju apguves modelis pusaudžiem, noteikti tā nozīmīgākie struktūrkomponenti, akcentējot ģimeniskuma un sadarbības nozīmi. Empīriskā pētījuma rezultāti apstiprina aizvirzīto hipotēzi par dzīvesdarbības prasmju apguvi internātpamatskolas pedagoģiskajā procesā. Pētījuma bāzi veido Balvu novada Tilžas internātpamatskolas, Liepājas novada Vaiņodes internātpamatskolas, Alūksnes novada Liepnas internātpamatskolas un Jēkabpils novada Biržu internātpamatskolas 140 skolēni un 69 skolotāji. Promocijas darbu veido divas daļas, nobeigums, literatūras saraksts un pielikumi. Darba pamatteksts izklāstīts uz 156 lappusēm, to ilustrē 36 attēli, 9 tabulas. Literatūras un avotu sarakstā iekļauti 307 izdevumu nosaukumi latviešu, krievu, angļu un vācu valodās. Pievienots 21 pielikums. Atslēgvārdi: darbība, dzīvesdarbība, prasmes, dzīvesdarbības prasmes, internātpamatskolas pedagoģiskais process. The goal of the PhD dissertation is to study the lifeskills of adolescents living in a general boarding elementary school and to develop theoretically based pedagogical operating model for acquisition of lifeskills, and to examine it experimentally. Topicality of the research has been determined by the fact that the pedagogical process of the boarding elementary school has not been researched yet; there is no consequent understanding, how to relate acquisition of lifeskills with learning and upbringing process, as well as the necessity of theoretically based and empirically examined criteria and indicators of lifeskills’ acquisition in the pedagogical theory and practice of schools (boarding elementary schools). The author of the PhD dissertation analyses nature of activity, lifeskills activity and specifies the notion of lifeskills. Building of lifeskills in actions, its objective and subjective components are discovered on the basis of scientific literature analysis by justifying the necessity of lifeskills at boarding elementary school, which determines further successful life activities of pupils. The following subjective contributing factors of lifeskills have been defined: motivatedness, purposefulness, self-independence, self-development. In the PhD dissertation pedagogical conditions for successful development of adolescents’ lifeskills in the pedagogical process of general boarding elementary school are discovered. During the research period the procedural structure of lifeskills’ building has been developed and empirically examined, as well as criteria and indicators of lifeskills. Theoretically-based model for acquisition of lifeskills for adolescents has been created; the most significant structural components emphasizing importance of family and cooperation has been determined. Results of empirical research approve the stated hypothesis about acquisition of lifeskills in the pedagogical process of boarding elementary school. Research base consists of 140 pupils and 69 teachers of Balvi Municipality Tilža Boarding Elementary School, Alūksne Municipality Liepna Boarding Elementary School and Jēkabpils Municipality Biržu Boarding Elementary School.

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    Authors: Aleksejeva, Inese;

    Goal of Inese Aleksejeva’s doctoral thesis „Latvian consumers’ attitude towards use of genetically modified organisms” is to assess Latvian consumers’ attitude towards use of genetically modified organisms (GMO) in food and other industries, to identify main factors influencing Latvian consumers’ attitude towards GMO and to provide the proposals for the most appropriate form of marketing communication with consumers on GMO issues. In the frame of the thesis an analysis of consumers’ attitude towards GMO in other countries was made and an assessment of the formation of the consumers’ opinion and of the factors influencing it was provided; a comparative analysis of attitude towards GMO between Latvian and other countries’ consumers was carried out; perspevtives of GMO development were assessed and the potential benefits and risks that may result from the use of GMO were evaluated. In the first chapter of the thesis the author analyzed GMO development perspectives, studied the history and use of GMO in food, feed, agriculture and other industries, assessed the possible risks and benefits of GMO to human and animal health, and the environment, provided an analysis of the socio-economic risks and benefits as well as performed an analysis of the EU and Latvian normative acts in the field of GMO. In the second chapter the author focused on the theory of consumers’ attitude and analyzed most popular consumers’ attitude assessment models; evaluated in-depth consumers’ attitude towards use of GMO in food, feed and other industries, identified the key factors affecting consumers’attitude as well as analyzed the role of marketing communications in shaping of consumers’ attitude towards GMO. In the third chapter the author analyzed the empirical results of the surveys carried out among the EU experts and Latvian consumers in terms of attitude towards use of GMO as well as developed consumers’ attitude towards GMO model and provided the proposals for information communication with consumers on GMO issues. The dissertation contains 200 pages, illustrated with 25 images and 29 tables. The bibliography includes 358 literary sources, 7 appendices added. Keywords: benefits, consumers’ attitude, consumers influencing factors, genetically modified organism, marketing communications, risks. Ineses Aleksejevas promocijas darba „Latvijas patērētāju attieksme pret ģenētiski modificētiem organismiem” mērķis ir izvērtēt Latvijas patērētāju attieksmi pret ģenētiski modificēto organismu (ĢMO) izmantošanu pārtikā un citās tautsaimniecības nozarēs, identificēt galvenos Latvijas patērētāju attieksmi pret ĢMO veidojošos faktorus un sniegt priekšlikumus par piemērotāko mārketinga komunikācijas veidu ar patērētājiem par ĢMO jomas jautājumiem. Promocijas darbā tika veikta analīze arī par citu valstu patērētāju attieksmi pret ĢMO, par to, kā veidojas šī attieksme un kādi faktori to ietekmē, veikta salīdzinošā analīze par Latvijas un citu pasaules valstu patērētāju attieksmi pret ĢMO, izvērtētas ĢMO attīstības perspektīvas, kā arī iespējamie ĢMO izmantošanas ieguvumi un iespējamie riski, Promocijas darba pirmajā nodaļā autore pievērsusies padziļinātai ĢMO attīstības perspektīvu analīzei, izpētījusi ĢMO attīstības vēsturi un izmantošanu pārtikā, dzīvnieku barībā, lauksaimniecībā un citās tautsaimniecības nozarēs, izvērtējusi ĢMO iespējamos riskus un ieguvumus cilvēku un dzīvnieku veselībai un videi, sniegusi analīzi par sociālekonomiskajiem riskiem un ieguvumiem, kā arī analizējusi ĢMO apriti regulējošos ES un Latvijas normatīvos aktus. Otrajā nodaļā autore analizējusi patērētāju attieksmi un tās vērtēšanas modeļus, sīkāk pētījusi patērētāju attieksmi pret ĢMO izmantošanu pārtikā, dzīvnieku barībā un citās tautsaimniecības nozarēs, identificējusi galvenos faktorus, kas ietekmē šo attieksmi, kā arī analizējusi mārketinga komunikāciju lomu patērētāju attieksmes pret ĢMO veidošanā. Trešajā nodaļā autore devusi ES ekspertu un Latvijas patērētāju attieksmes pret ĢMO aptaujas empīrisko rezultātu analīzi, izstrādājusi patērētāju attieksmes pret ĢMO modeli un priekšlikumus informācijas komunikācijai šajā jautājumā. Promocijas darba saturs izklāstīts uz 200 lapaspusēm, ilustrēts ar 25 attēliem un 29 tabulām. Literatūras sarakstā iekļauts 358 literatūras avots. Darbam pievienoti 7 pielikumi. Atslēgvārdi: ģenētiski modificēts organisms, ieguvumi, patērētāju attieksme, patērētāju attieksmi ietekmējošie faktori, mārketinga komunikācijas, riski.  Elektroniskā versija nesatur pielikumus

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    Authors: Cerūzis, Raimonds; Latvijas Universitāte. Vēstures un filozofijas fakultāte;

    Advisor: Feldmanis, Inesis

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    Authors: Siņenko, Nadežda;
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    Authors: Platoņenko, Aleksandrs;

    Radiation-induced changes in the properties of are mainly associated with oxygen vacancies and interstitial defects. While oxygen vacancies are well studied, the interstitial oxygen atom has not been described in detail both experimentally and theoretically until now. Using ab initio modelling code CRYSTAL17, radiation point defects in two materials were investigated, their recombination energy barriers were estimated. The application of Raman spectroscopy for defect identification was also proposed. In MgAl2O4 the EPR parameters of various antisite and cation vacancy defects were calculated. Efficient comparison of the calculated and experimental results allowed a deeper understanding of the behavior of Al2O3 and MgAl2O4 point defects, which can be extended to the wider range of oxides. Radiācijas izraisītas izmaiņas α-Al2O3 un MgAl2O4 īpašībās ir galvenokārt saistītas ar skābekļa vakancēm un starpmezglu defektiem. Kamēr skābekļa vakances ir labi izpētītas, starpmezglu skābekļa atoms līdz šīm nebija detalizēti aprakstīts gan eksperimentāli, gan teorētiski. Izmantojot ab initio modelēšanas kodu CRYSTAL17, darbā tika izpētīti radiācijas defekti divos materiālos, noteikta to rekombinācijas enerģijas barjera. Tika piedāvāta arī Ramana spektroskopijas pielietošana defektu identificēšanai. MgAl2O4 tika aprēķināti dažādu antisaitu un katjonu vakances defektu EPR parametri. Efektīvs aprēķinu un eksperimentālo rezultātu salīdzinājums ļāva dziļāk izprast Al2O3 un MgAl2O4 punktu defektu uzvedību, kas var būt attiecināms arī uz plašāko oksīdu klāstu

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    Authors: Berenis, Didzis;

    This thesis investigates a rotating permanent magnet (RPM) generated turbulent flow in a closed volume. Analytical, experimental, and numerical approaches are employed. The force generated by the RPM in a conducting cylinder or ring is solved using elliptic integrals. A simplified analytical solution incorporates radial dependency of the driving force to calculate flow velocity in a cylinder. Analytical solution agrees with experiments and numerical simulations using OpenFOAM and Elmer. The thesis also explores RPM generated radial jet instability in a ring channel, leading to bistability. The jet chaotically switches between leaning up or down for long intervals, which poses challenges for turbulence models. The bistability is observed experimentally in a transparent electrolyte ring, although not as convincingly as in simulations. Promocijas darbā ir veikts analītisks, skaitlisks un eksperimentāls pētījums par rotējošu pastāvīgo magnētu (RPM) ierosinātām turbulentām plūsmām slēgtos traukos. Izmantojot eliptiskos integrāļus ir iegūts RPM inducētais spēks elektrovadošos cilindros un gredzenos. Iegūts vienkāršots analītiskais atrisinājums ar dzenošā spēka radiālo atkarību, lai aprēķinātu plūsmas ātrumu cilindrā. Analītiskais atrisinājums sakrīt ar eksperimentiem un ar OpenFOAM un Elmer skaitliskajām simulācijām. Pētīta arī RPM ierosinātās radiālās strūklas nestabilitāte gredzena kanālā, kura noved pie bistabilitātes. Strūkla haotiski pārslēdzas starp ilglaicīgi noliegtu augšup vai lejup, kas var radīt problēmas turbulences modeļiem. Eksperimentāli bistabilitāte ir novērota gredzenā ar caurspīdīgu elektrolītu, taču ne tik pārliecinoši kā skaitliskajā simulācijā.

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    Authors: Mārtinsone, Kristīne; Latvijas Universitāte;
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    Authors: Penēze, Zanda;
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