Search results for "RPT"
showing 10 items of 5119 documents
Brazīlijas Federatīvās Republikas starptautisko pienākumu saturs attiecībā pret amazones baseina lietusmežu ugunsgrēku novēršanu
2020
Amazones baseina lietus mežs sedz ievērojamu Brazīlijas Federatīvās Republikas teritorijas daļu, un Brazīlijai ir saistoši vairāki starptautiska rakstura pienākumi saistībā ar cilvēktiesībām un vides aizsardzību ugunsgrēku novēršanā. 2019. gada vasarā Amazones lietus mežā izcēlās apjomīgs ugunsgrēks, kā pamatā ir vairāki iespējamie izcelšanās iemesli, piemēram, neilgtspējīga mežsaimniecība, neefektīvs nacionālais regulējums sankciju piemērošanā un ietekmes uz vidi novērtējuma īstenošanā, kā arī prettiesiska Amazones baseina mežu izciršana lauksaimniecības vajadzībām. Darba mērķis ir apzināt Brazīlijas starptautiskos vides tiesību un cilvēktiesību pienākumus un noskaidrot, vai cita valsts, k…
Spectral analysis of the dipping LMXB system XB 1916-053
2019
Context: XB 1916-053 is a low mass X-ray binary system (LMXB) hosting a neutron star (NS) and showing periodic dips. The spectrum of the persistent emission was modeled with a blackbody component having a temperature between 1.31 and 1.67 keV and with a Comptonization component with an electron temperature of 9.4 keV and a photon index $\Gamma$ between 2.5 and 2.9. The presence of absorption features associated with highly ionized elements suggested the presence of partially ionized plasma in the system. Aims: In this work we performed a study of the spectrum of XB 1916-053, which aims to shed light on the nature of the seed photons that contribute to the Comptonization component. Methods: …
Robežlīmeņa personības traucējumu izplatība studentiem Latvijā
2021
Nosaukums: “Robežlīmeņa personības traucējumu izplatība studentiem Latvijā.” Ievads: Robežlīmeņa personības traucējumi (RPT) vispārējā populācijā ir aptuveni 1%. Savukārt universitātes un koledžas studentu populācijā šis skaitlis var sasniegt vidēji pat 16,5%, jo studenti saskaras ar lielu stresu, kas kombinējoties ar nediagnosticētiem RPT un sabiedrības spiedienu nelabvēlīgi ietekmē studentus ilgtermiņā. Mērķi: Noteikt RPT izplatību studentu populācijā Latvijā, salīdzināt to izplatību saistībā ar dzimumu un vecumu. Materiāli un metodes: Šķērsgriezuma pilotpētījums tika veikts Latvijā tiešsaistes aptaujas veidā laika posmā no 2021.gada 1.februāra līdz 1.martam COVID-19 pandēmijas laikā. Lai…
Latvijas universitāšu starptautiskā sadarbība: studentu mobilitātes motivācijas izpēte
2018
Maģistra darba autore Eva Kazāka izstrādāja darbu, kura temats ir, “Latvijas universitāšu starptautiskā sadarbība: studentu mobilitātes motivācijas izpēte”. Maģistra darba mērķis ir izpētīt faktorus, kuri ietekmē studentu motivāciju piedalīties starptautiskajā studiju mobilitātē un izstrādāt priekšlikumus Latvijas universitātēm, lai veicinātu aktīvāku studentu mobilitāšu īstenošanu starptautiskās sadarbības pilnveidošanai. Maģistra darba teorētiskajā daļā tiek izzināts starptautiskās sadarbības jēdziens, jomas, veidi un specifika augstākās izglītības telpā, noskaidrots motivācijas jēdziens, veidi, to ietekmējošie faktori un studentu motivācija starptautiskajā sadarbībā, kā arī raksturots st…
On the adsorption and reactivity of element 114, flerovium
2022
Flerovium (Fl, element 114) is the heaviest element chemically studied so far. To date, its interaction with gold was investigated in two gas-solid chromatography experiments, which reported two different types of interaction, however, each based on the level of a few registered atoms only. Whereas noble-gas-like properties were suggested from the first experiment, the second one pointed at a volatile-metal-like character. Here, we present further experimental data on adsorption studies of Fl on silicon oxide and gold surfaces, accounting for the inhomogeneous nature of the surface, as it was used in the experiment and analyzed as part of the reported studies. We confirm that Fl is highly v…
The Jäntti approach to adsorption with increasing gas pressure
2002
Jäntti introduced a method of calculating equilibrium adsorption from measurements where the pressure of the gas was varied in a stepwise manner. His aim was to shorten the time necessary for a given measurement. The method was applied to gas/solid systems in which simple adsorption processes occurred and where the number of adsorption sites was infinite. The present paper discusses the case where no adsorption is possible on an already occupied site (Langmuir isotherm) while the number of positions available for adsorption is considered limited. The advantages of using a gas pressure that increases linearly with time are evident for studies with this limitation. It is shown that such meas…
Excitation Energy-Transfer in the LH2 Antenna of Photosynthetic Purple Bacteria via Excitonic B800 and B850 States
2000
A newly developed CIEM method that uses a combination of semi-empirical or ab-initio configuration interaction methods and exciton theory to predict electronic energies, eigenstates, absorption and CD spectra of aggregated chromophoric systems with environmental interactions included is extended and used for estimation of excitation energy transfer rates. Excitonic energy levels of the two ring systems the B800 and the B850 of the light harvesting antenna LH2 of Rhodopseudomonas acidophila and the corresponding absorption spectrum were calculated by assuming inter-ring interactions to be zero. Excitation energy transfer rates were calculated by using the Fermi Golden rule with the dipole - …
Second harmonic ac polarography of strongly adsorbed electroactive species
1981
Abstract The second harmonic ac current is calculated for the case of a quasi-reversible surface redox system: both species are strongly adsorbed according to a Langmuir isotherm and the kinetics of the process are controlled by the electron transfer. The current is measured with a phase-sensitive detector and the variation of the in-phase and quadrature components vs. the frequency leads to the surface rate constant ks. The experimental results obtained for benzo-(c)cinnoline are in good agreement with the theoretical predictions and with the results of impedance measurements. The advantages of the two methods are compared.
Theoretical Study of the Electronic Spectrum of trans-Stilbene
1997
The electronic spectrum of trans-stilbene in the energy range up to 6 eV has been studied using multiconfigurational second-order perturbation theory (CASPT2). The study includes a geometry determination of the ground state. In all, 12 singlet and one triplet excited states were studied. The calculated spectrum makes it possible to assign the valence excited singlet states corresponding to the three bands observed in the low-energy region of the one-photon absorption spectrum. The most intense feature of the calculated spectrum corresponds to the 11Ag → 21Bu transition at 4.07 eV. The weakly allowed 11Bu state was found 0.3 eV below 21Bu. Transition to the 31Ag state, computed at 4.95 eV, i…
Synthesis and selected properties of metallo and metal-free 2,3,9,10,16,17,23,24-octacarboxyphthalocyanines
2015
This review article reports methods of synthe sis and selected physicochemical properties of metallo and metal-free 2,3,9,10,16,17,23,24–octacarboxyphthalocyanines. The most frequently used methods of synthesis for this class of co mpounds are described in this article. Moreover, aggregation, catalytic and photocatalytic properties of these complexes are presented. Potential applications of metallo and metal-free 2,3,9,10,16,17,23,24–octacarboxyphthalocyanines are also given.