Search results for "init"
showing 10 items of 6629 documents
Electric Field Generation and Control of Bipartite Quantum Entanglement between Electronic Spins in Mixed Valence Polyoxovanadate [GeV14O40]8–
2017
As part of the search for systems in which control of quantum entanglement can be achieved, here we consider the paramagnetic mixed valence polyoxometalate K2Na6[GeV14O40]·10H2O in which two electrons are delocalized over the 14 vanadium ions. Applying a homogeneous electric field can induce an antiferromagnetic coupling between the two delocalized electronic spins that behave independently in the absence of the field. On the basis of the proposed theoretical model, we show that the external field can be used to generate controllable quantum entanglement between the two electronic spins traveling over a vanadium network of mixed valence polyoxoanion [GeV14O40]8–. Within a simplified two-lev…
Theoretical study of the electronic spectra ofcis-1,3,5-hexatriene andcis-1,3-butadiene
1994
The electronic spectra forcis-1,3-butadiene andcis-1,3,5-hexatriene have been studied using multiconfiguration second-order perturbation theory (CASPT2) and extended ANO basis sets. The calculations comprise all singlet valence excited states below 8.0 eV, the first 3s, 3p, 3d Rydberg states, and the second 3s state. The four lowest triplet states were also studied. The resulting excitation energies forcis-hexatriene have been used in an assignment of the experimental spectrum, leading to a maximum deviation of 0.13 eV for the vertical transition energies. The calculations place the 11 B 2 state 0.04 eV below the 21 A 1 state. 16 excited states were studied incis-butadiene, using a CASPT2 o…
Physical properties of (1−x)Ba0.95Pb0.05TiO3+xCo2O3 (x=0, 0.1, 0.3, 0.5, 1.0, 2.0wt%) ceramics
2015
The paper reports studies of the (1−x)Ba0.95Pb0.05TiO3 – xCo2O3 (x≤0.02) ceramics. Results of X-ray powder diffraction, dielectric, magnetic and IR measurements, as well as ab initio simulations are presented. The Co-doping induces small decrease of the (c/a) tetragonality of the perovskite lattice and leads to the gradual shift of the ferroelectric transition temperature from 398 K for x=0 down to 357 K for x=0.02. The conductivity activation energies are in the range 0.8–0.9 eV in agreement with the calculations. The high-temperature conductivity can be ascribed by the migration of oxygen vacancies introduced to compensate the charge deficiency due to Co3+ valence at the B-site of the per…
Understanding the trend in the Curie temperatures ofCo2-based Heusler compounds:Ab initiocalculations
2007
The Curie temperatures for the Heusler compounds Co{sub 2}TiAl, Co{sub 2}VGa, Co{sub 2}VSn, Co{sub 2}CrGa, Co{sub 2}CrAl, Co{sub 2}MnAl, Co{sub 2}MnSn, Co{sub 2}MnSi, and Co{sub 2}FeSi are determined ab initio from the electronic structure obtained with the local-density functional approximation and/or the generalized gradient approximation. Frozen spin spirals are used to model the excited states needed to evaluate the spherical approximation for the Curie temperature. The spherical approximation is found to describe the experimental Curie temperatures very well which, for the compounds selected, extend over the range from 95 to 1100 K; as a function of the valence electron count, they sho…
Theoretical characterization of the lowest-energy absorption band of pyrrole
2002
The lowest-energy band of the electronic spectrum of pyrrole has been studied with vibrational resolution by using multiconfigurational second-order perturbation theory (CASPT2) and its multistate extension (MS–CASPT2) in conjunction with large atomic natural orbital-type basis sets including Rydberg functions. The obtained results provide a consistent picture of the recorded spectrum in the energy region 5.5–6.5 eV and confirm that the bulk of the intensity of the band arises from a ππ∗ intravalence transition, in contradiction to recent theoretical claims. Computed band origins for the 3s,3p Rydberg electronic transitions are in agreement with the available experimental data, although new…
Medicinal Plants for Insomnia Related to Anxiety: An Updated Review.
2021
AbstractSleep disorders are common among the general population and can generate health problems such as insomnia and anxiety. In addition to standard drugs and psychological interventions, there are different complementary plant-based therapies used to treat insomnia and anxiety. This review aimed to find and examine the most recent research on the use of herbal medicines for treating anxiety and insomnia as compiled from clinical trials, as well as to assess the safety and efficacy of these medicines and to elucidate their possible mechanisms of action. The process entailed a search of PubMed, Scopus, and the Cochrane Library databases from 2010 to 2020. The search terms included “sleep d…
Saīsinājumu lietojums tekstos par tirgvedību
2020
Šīs pētījums ir veltīts saīsinājumu lietošanas analīzei tirgvedības tekstos. Pētījuma mērķis ir iznalizēt literatūru par saīsinājumu veidiem, kā arī identificēt saīsinājumu izmantošanu tekstos par tirgvedību, analizēt to frekvenci un norādīt izmantošanas mērķi. Pētījumā tika analizēti 40 tirgvedības raksti, kuri publicēti no 2019. līdz 2020. gadam. Tika izmantotas gan kvalitatīvas, gan kvantitatīvas izpētes metodes. Rezultāti liecina, ka izvēlētajos tekstos tiek izmantoti tādi saīsinājumu veidi kā iniciālismi, akronīmi, abreviācijas un burtu un ciparu kombinācijas tips. Turklāt pētījumā konstatēts, ka lielākā daļa saīsinājumu, ko izmanto analizētajos rakstos, ir saistīti ar tirgvedību vai t…
Somu valodas infinitīva konstrukcija “finaalirakenne” un tās lietojums interneta čatos
2021
Bakalaura darba “Somu valodas infinitīva konstrukcija ”Finaalirakenne” un tās lietojums interneta čatos” mērķis ir izpētīt minētās konstrukcijas lietojumu ikdienas valodā, kā arī apskatīt tās rašanos un attīstību rakstu valodā. Darba teorētiskajā daļā ir sniegts pārskats par šo konstrukciju no dažādu gramatiku viedokļa, kā arī apskatīti ar šo jomu saistītie iepriekšējie pētījumi un teorētiskie principi. Empīriskajā daļā ir analizēts A-infinitīva translatīva lietojums interneta čatos. Tajā aprakstīts sākotnējais modelis un novērojumi, kurus izmantojot var atklāt jaunas parādības valodas attīstībā. Bakalaura darba galvenais rezultāts ir atziņa, kas ir pretrunā ar līdzšinējām somu valodas gram…
From corona virus to corona crisis : the value of an analytical and geographical understanding of crisis
2020
Abstract The term ‘crisis’ is omnipresent. The current corona virus pandemic is perceived as the most recent example. However, the notion of crisis is increasingly deployed as a signifier of relevance, rather than as an analytical concept. Moreover, human geography has so far little contributed to the interdisciplinary crisis research field which is fixated on the temporal aspects of crisis but neglects its spatiality. Against this background, the first aim of the paper is to demonstrate the value of thinking about crisis analytically. Therefore, we introduce theoretical knowledge developed within a recently emerging literature on crisis management. Second, we demonstrate the relevance of i…
The role of higher education institutions in sustainability initiatives at the local level
2019
FNEGE 2, HCERES B, ABS 2; International audience; Universities are central players and important economic actors in many regions, and many of them are, in general, nationally and internationally active in respect of matters related to sustainable development. But there is a paucity of research which examines their contributions towards sustainability efforts at the local level, i.e. in the places they are situated. This paper addresses this need, by reporting on a qualitative study deploying a Matrix, which allows an analysis and reporting of regional sustainable development initiatives of a set of 22 universities in industrialised and developing countries. Recommendations to enhance their …