Search results for " Gai"
showing 10 items of 446 documents
Maailmankaikkeuden rakenne sekä tähdet ja planeetat Plinius vanhemman Naturalis historia -teoksen toisessa kirjassa
2003
Astrometry and photometry of digitized plates of Baldone Schmidt telescope
2021
Abstract During the 40-year photographic period of astronomical observations, the Baldone Astrophysical Observatory has accumulated more than 22,000 direct and 2,500 spectral images. In 2018, the digitization of direct astrophoto images with a resolution of 1200 dpi was completed. A processing methodology for obtaining the equatorial coordinates and photometric characteristics of the objects recorded in digitized astronegatives using the LINUX/MIDAS/ROMAFOT environment has been developed at the Main Astronomical Observatory of the National Academy of Sciences of Ukraine. Program package with success already works in seven observatories. A description of the operation of this program complex…
Ar vējauzas (Avena fatua) un parastās gaiļsāres (Echinochloa crus-galli) sēklām saistīto Fusarium sēņu sēklu degradēšanas potenciāla novērtējums
2022
Nezāļu augsnes sēklu bankas veidošanās ir nezāļu populāciju izdzīvošanas mehānisms, it īpaši aramzemju platībās. Nezāļu sēklas augsnes apstākļos tiek pakļautas dažādu biotisku un abiotisku faktoru ietekmei, kā rezultāta dažādi faktori var ietekmēt sēklu izdzīvošanu. Viens no galvenajiem sēklu bojāejas iemesliem augsnes apstākļos ir mijiedarbības ar dažādiem mikroorganismiem, tostarp patogēnām sēnēm. Tās spēj kolonizēt sēklas pirms nogatavošanās, vai pēc tās, sēklām nonākot augsnē. Patogēno sēņu potenciālu inficēt un degradēt sēklas augsnes apstākļos ietekmē sēklu morfoloģiskie un fizioloģiskie aizsardzības mehānismi un dažādām sēņu sugām un celmiem raksturīgās patogenitāti ietekmējošās īpaš…
Luminiscences pētījumi ar diviem retzemju joniem aktivētos oksifluorīdu stiklos un stikla keramikās
2015
Baltās gaismas LED lampas ir ļoti aktuāls pētījumu objekts- tiek meklētas labākās izgatavošanas tehnoloģijas un veiksmīgākais luminoforu sastāvs. Svarīgi ir ne tikai iegūt baltu gaismu, bet arī nodrošināt augstu gaismas kvalitāti. Kā perspektīvi luminoforu materiāli tiek minēti ar retzemju joniem aktivēti oksiflorīdu stikli un stikla keramikas, jo šiem materiāliem piemīt labas mehāniskās un optiskās īpašības. Literatūras apskatā sniegta informācija par luminiscences mehānismu, baltās gaismas LED diožu ražošanas tehnikām un gaismas avotu krāsas raksturlielumiem, kā arī, apskatīti oksifluorīdu materiāli un retzemju jonu vispārīgās un luminiscences īpašības. Darba praktiskajā daļā izgatavoti a…
Ar eiropiju un disproziju koaktivētu oksifluorīdu stiklu luminiscence
2016
Baltās gaismas diodes ir aktuāls pētniecības virziens apgaismes tehnoloģiju attīstībā. Pēdējos gados par aktuālu pētniecības virzienu ir kļuvusi ar retzemju joniem aktivētu oksifluorīdu stiklu un stikla keramiku materiālu pētniecība. Dotie materiāli ir perspektīvi baltās gaismas luminofori, jo tiem piemīt labas optiskās, ķīmiskās un mehāniskās īpašības. Darbā tiek veikti ar Eu3+ un Dy3+ joniem aktivētu oksifluorīdu stiklu spektroskopiskie pētījumi, ar mērķi izpētīt doto jonu savstarpējo mijiedarbību caur enerģijas pārnesi, kas ļautu novērtēt dotā materiāla kā baltās gaismas luminofora izstrādes iespējas. Literatūras apskatā tiek apskatīti luminiscences mehānisma principi, retzemju elementi …
A Cross-Cultural Exploratory Study of Health Behaviors and Wellbeing During COVID-19
2021
This study explored the influence of the COVID-19 pandemic on perceived health behaviors; physical activity, sleep, and diet behaviors, alongside associations with wellbeing. Participants were 1,140 individuals residing in the United Kingdom (n = 230), South Korea (n = 204), Finland (n = 171), Philippines (n = 132), Latin America (n = 124), Spain (n = 112), North America (n = 87), and Italy (n = 80). They completed an online survey reporting possible changes in the targeted behaviors as well as perceived changes in their physical and mental health. Multivariate analyses of covariance (MANCOVA) on the final sample (n = 1,131) revealed significant mean differences regarding perceived physical…
Developing the "Choosing Health" Digital Weight Loss and Maintenance Intervention: Intervention Mapping Study
2022
Background Digital health promotion programs tailored to the individual are a potential cost-effective and scalable solution to enable self-management and provide support to people with excess body weight. However, solutions that are widely accessible, personalized, and theory- and evidence-based are still limited. Objective This study aimed to develop a digital behavior change program, Choosing Health, that could identify modifiable predictors of weight loss and maintenance for each individual and use these to provide tailored support. Methods We applied an Intervention Mapping protocol to design the program. This systematic approach to develop theory- and evidence-based health promotion …
Productivity of an Atriplex halimus shrubbery and effects of grazing on lambs
2009
The objectives of this study were to 1) evaluate the productivity and forage quality of Atriplex halimus, 2) investigate modifications to shrub structure induced by grazing, and 3) assess live weight changes in lambs grazing on A. halimus with and without a feed supplement (wheat straw ± barley grain). The results showed that A. halimus had low productivity (approximately 1000 kg DM ha–1) but high tolerance to grazing by lambs, although minor modifications in plant structure due to grazing were observed. Lambs grazing A. halimus as a sole diet lost weight (about 60 g lamb−1 d–1; P < 0.01), probably as a consequence of the high salt content of the forage reducing bot…
Effects of soybean meal based diet on growth performance, gut histopathology and intestinal microbiota of juvenile rainbow trout (Oncorhynchus mykiss)
2006
Abstract Effects of soybean meal (SBM) based diet on growth performance, histology of the intestinal epithelium and on the gut microbiota of juvenile rainbow trout (Oncorhynchus mykiss) were investigated on two trials lasting for 8 weeks (Trial I) and 18 weeks (Trial II). The microbiological characterization was done both with conventional plating techniques, biochemical profiling and length heterogeneity analysis of PCR amplified 16S rDNA (LH-PCR). Typical histological changes were found after 18 weeks of SBM feeding (Trial II). Mean height of simple foldings were significantly higher within the group fed with fish meal (FM) based diet. These changes were not, however, reflected in the app…
The effect of the length of repeated feed deprivation between single meals on compensatory growth of pikeperch Sander lucioperca
2009
Abstract Juvenile pikeperch ( Sander lucioperca ) were reared for 58 days according to one of the following feeding regimes: control (fed once every day); 1 + 1 (fed every other day); 1 + 3 (one-day feeding followed by a three-day feed deprivation); and 1 + 6 (fed once a week). Control fish had significantly higher growth rate than the 1 + 3 and 1 + 6 fish, and consequently the final weight of the controls (125.2 ± SD 30.0 g, n = 4) was higher than that of the 1 + 3 (84.0 ± 17.9 g) and 1 + 6 fish (64.7 ± 7.2 g). Fish in the treatment groups were capable to compensate for the reduced number of feedings by increasing intake relative to the controls when feed was available. This hyperphagic r…