Search results for "kr"
showing 10 items of 7011 documents
Makro- un mikroelementu sastopamības variācijas mellenēs Vaccinium Myrtillus L.) un augsnē
2020
Darbā tika analizēts dzelzs, cinka, vara, kālija un fosfātjonu saturs mellenēs (Vaccinium myrtillus L.), krūmmellenēs (Vaccinium corymbosum) un to augsnē. Melleņu un augsnes paraugi tika ievākti meža teritorijā, kur tika mēslots ar vieglajiem koksnes pelniem. Krūmmelleņu ogu un augsnes paraugi tika ievākti privātmājas teritorijā, kur netika izmantots nekāds mēslojums. Veicot sauso mineralizāciju, ar liesmas atomabsorbciometrijas metodi noteikts dzelzs, cinka un vara saturs, fotometriski tika noteikts fosfātjonu saturs un ar liesmas fotometriju tika noteikts kālija saturs. Iegūtie rezultāti tika apstrādāti, izvērtēts noteikto elementu saturs mellenēs un krūmmellenēs, kā arī iegūtie rezultāti…
Apache Kafka izkliedēta ziņojumapmaiņas klastera ieviešana starpservisu komunikācijas uzlabošanai
2021
Darbā tiek izskatīta mikroservisu komunikācijas problēma, kur Apache Kafka sistēmas ieviešana tika aplūkota kā šīs problēmas potenciāls risinājums. Darba ietvaros tika piedāvāts Kafka klastera izveides risinājums centralizētai datu apmaiņai mikroservisu sistēmā. Darba mērķis ir izpētīt Apache Kafka sistēmu kā risinājumu mikroservisu komunikācijas uzlabošanai, izpētīt Apache Kafka klastera izveides paņēmienus, kā arī veikt Apache Kafka klastera izveidi.
Chemical characterization of okra stalk (Abelmoschus esculentus) as potential raw material for biorefinery utilization
2018
In the present work, okra stalk (Abelmoschus esculentus) was chemically characterized to evaluate its appropriate exploitation as a biorefinery feedstock. The chemical composition of this renewable lignocellulosic material yielding maximum up to 120 tons per hectare was primarily determined by methods of wood chemical analysis. In terms of its main organic constituents, its dry matter contained 65.0% carbohydrates (cellulose, hemicelluloses and other polysaccharides), 20.5% lignin and 5.0% extractives. In addition, thermogravimetric analyses revealed that the content of proteins and inorganics was 6.6 and 3.3% of the dry matter, respectively. Among the inorganic elements determined by induc…
Iodine−Benzene Complex as a Candidate for a Real-Time Control of a Bimolecular Reaction. Spectroscopic Studies of the Properties of the 1:1 Complex I…
2009
The properties of the 1:1 iodine-benzene complex isolated in a solid Kr matrix at low temperatures have been studied using UV-vis absorption, FTIR, resonance Raman, and femtosecond coherent anti-Stokes Raman spectroscopy (fs-CARS). The use of all these techniques on similar samples provides a wide view on the spectroscopic properties of the complex and allows comparison and combination of the results from different methods. The results for the complex cover its structure, the changes in the iodine molecule's vibrational frequencies and electronic absorption spectrum upon complexation, and the dynamics of the complexed I(2) molecule on both ground and excited electronic states. In addition, …
Novedades y rectificaciones sobre la historia musulamana de Valencia
1968
L’esperienza dell’immagine: il Denkraum der Besonnenheit di Aby Warburg
2014
Il lavoro si fonda sull’idea che il periodo del ricovero (1921-1924) di Aby Warburg nella clinica di Bellevue (Kreuzlingen), allora diretta da Ludwig Binswanger, debba essere considerato centrale per lo sviluppo teorico dello studioso amburghese. Piuttosto che liquidare come lungo momento di buio gli anni della malattia, si è ritenuto utile riflettere sulle connessioni tra l’esperienza e l’attitudine esistenziale di Warburg e gli sviluppi della sua ricerca. Prendendo in esame la celebre conferenza sul rituale del serpente (A lecture on Serpent Ritual) che lo storico dell’arte tedesco tenne nel 1923 a Kreuzlingen, con il consenso di Binswanger, per attestare la sua guarigione davanti a un pu…
Simultaneous production of furfural and levulinic acid from pine sawdust via acid-catalysed mechanical depolymerization and microwave irradiation
2019
In this work pine sawdust was converted into levulinic acid (LA) and furfural. Sawdust was first pre-treated with sulfuric acid-catalysed mechanical depolymerization. The conversion reactions were then performed with microwave heating at 180 °C. To enhance the furfural yield and the efficient separation of furfural and LA, a biphasic water-toluene reaction system was used. The effect of an additional catalyst, AlCl3, on the yield of LA and furfural was also studied. According to the results the pre-treatment method enhanced the yields of LA. In addition, due to the microwave heating the reaction times were short. Additional AlCl3 catalyst enhanced the LA yield, however excellent furfural yi…
Dissemination of a Carbapenem-Resistant Acinetobacter baumannii Strain Belonging to International Clone II/Sequence Type 2 and Harboring a Novel AbaR…
2013
ABSTRACT An outbreak of hospital-acquired Acinetobacter baumannii infections, caused by a bla OXA-23 -positive carbapenem-resistant strain belonging to international clone II/ST2, was detected in Latvia. The strain was partially equipped with the armA gene and the intI1-aacA4-catB8-aadA1-qacE Δ 1 class 1 integron. In addition, the strain carried AbaR25, a novel AbaR4-like resistance island of ∼46,500 bp containing structures similar to the previously described AbaR22 and Tn 6167 islands. AbaR25 was characterized by the occurrence of a second copy of Tn 6022a interrupted by Tn 2006 carrying the bla OXA-23 gene.
Pēterburgas Zinātņu akadēmijas rakstu krājumi Latvijas Universitātes Muzejā
2019
Latvijas Universitātes Muzeja Botānikas un mikoloģijas kolekcijās glabājas Pēterburgas Zinātņu akadēmijas 18. gs. beigās – 19. gs. sākumā izdotā rakstu krājuma 27 sējumi - Acta Academiae Scientiarum Imperialis Petropolitanae (12 sējumi) un Nova Acta Academiae Scientiarum Imperialis Petropolitanae (15 sējumi). Raksts satur informāciju par Pēterburgas Zinātņu akadēmijas izveidi un rakstu krājuma publikāciju visražīgākajiem autoriem.
Mapping landscape canopy nitrogen content from space using PRISMA data
2021
Abstract Satellite imaging spectroscopy for terrestrial applications is reaching maturity with recently launched and upcoming science-driven missions, e.g. PRecursore IperSpettrale della Missione Applicativa (PRISMA) and Environmental Mapping and Analysis Program (EnMAP), respectively. Moreover, the high-priority mission candidate Copernicus Hyperspectral Imaging Mission for the Environment (CHIME) is expected to globally provide routine hyperspectral observations to support new and enhanced services for, among others, sustainable agricultural and biodiversity management. Thanks to the provision of contiguous visible-to-shortwave infrared spectral data, hyperspectral missions open enhanced …