Search results for "dab"

showing 10 items of 1280 documents

ChemInform Abstract: Efficient Synthesis of Racemic and Chiral Alkenyl Sulfoxides by Palladium-Catalyzed Suzuki Coupling.

2010

Alkenyl sulfoxide derivatives are obtained in high yields through a palladium-catalyzed Suzuki/Miyaura cross-coupling reaction of racemic and chiral 1-halo sulfoxides with aryl and alkenyl boronic acids. Chiral substrates react with no loss of optical purity and high optical yields. The reaction takes place with different palladium catalysts, such as Pd(PPh 3 ) 4 or Pd(OAc) 2 /DABCO. Although nitrogen ligands like DABCO lead to an active palladium catalyst, they are less effective than the phosphine ones.

Arylchemistry.chemical_elementSulfoxideGeneral MedicineDABCOMedicinal chemistryCatalysischemistry.chemical_compoundchemistrySuzuki reactionOrganic chemistryEnantiomeric excessPhosphinePalladiumChemInform
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Vector-borne and zoonotic infections and their relationships with regional and socioeconomic statuses: An ID-IRI survey in 24 countries of Europe, Af…

2021

Background: In this cross-sectional, international study, we aimed to analyze vector-borne and zoonotic infections (VBZI), which are significant global threats. Method: VBZIs’ data between May 20–28, 2018 was collected. The 24 Participatingcountries were classified as lower-middle, upper-middle, and high-income. Results: 382 patients were included. 175(45.8%) were hospitalized, most commonly in Croatia, Egypt, and Romania(P = 0.001). There was a significant difference between distributions of VBZIs according to geographical regions(P < 0.001). Amebiasis, Ancylostomiasis, Blastocystosis, Cryptosporidiosis, Giardiasis, Toxoplasmosis were significantly more common in the Middle-East while B…

AsiaSurveillance data030231 tropical medicineeducationEconomic statuTickSocioeconomic FactorZoonosis03 medical and health sciences0302 clinical medicineEconomic statusZoonosiMultidisciplinary approachZoonosesEnvironmental healthmedicineAnimalsHumansHemorrhagic Fever Crimean ...economic status ; infection ; tick ; vector ; zoonosisSocioeconomic statushealth care economics and organizationsCross-Sectional Studie0303 health sciencesZoonotic InfectionbiologyAnimal030306 microbiologyZoonosisSignificant differencePublic Health Environmental and Occupational HealthAn ID-IRI survey in 24 countries of Europe Africa and Asia- TRAVEL MEDICINE AND INFECTIOUS DISEASE cilt.44 2021 [Saydam F. N. Erdem H. ANKARALI H. Ramadan M. E. E. El-Sayed N. M. Civljak R. Pshenichnaya N. Moroti R. V. Mahmuodabad F. M. Maduka A. V. et al. -Vector-borne and zoonotic infections and their relationships with regional and socioeconomic statuses]medicine.diseasebiology.organism_classification3. Good healthEuropeCross-Sectional StudiesInfectious DiseasesGeographySocioeconomic FactorsVector (epidemiology)AfricaHemorrhagic Fever Virus Crimean-CongoHemorrhagic Fever CrimeanVectorInfectionTick
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Properties of the Binary Neutron Star Merger GW170817

2019

On August 17, 2017, the Advanced LIGO and Advanced Virgo gravitational-wave detectors observed a low-mass compact binary inspiral. The initial sky localization of the source of the gravitational-wave signal, GW170817, allowed electromagnetic observatories to identify NGC 4993 as the host galaxy. In this work, we improve initial estimates of the binary's properties, including component masses, spins, and tidal parameters, using the known source location, improved modeling, and recalibrated Virgo data. We extend the range of gravitational-wave frequencies considered down to 23 Hz, compared to 30 Hz in the initial analysis. We also compare results inferred using several signal models, which ar…

AstrofísicaGravitacióneutron star: binaryAstronomyGeneral Physics and AstronomyBinary numberAstrophysicsELECTROMAGNETIC COUNTERPARTspin01 natural sciencesGeneral Relativity and Quantum CosmologyGRAVITATIONAL-WAVESlocalization010305 fluids & plasmasGravitational wave detectorsEQUATIONenergy: densityLIGOGEO600QCastro-ph.HESettore FIS/01PhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)GAMMA-RAY BURSTSSettore FIS/05PhysicsEquations of stateGravitational effectsGravitational-wave signalsDeformability parameterAmplitudePhysical SciencesPhysical effectsINSPIRALING COMPACT BINARIES[PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc]Spectral energy densityAstrophysics - High Energy Astrophysical PhenomenaPARAMETER-ESTIMATIONBinary neutron starsdata analysis methodgr-qcQC1-999Physics MultidisciplinaryFOS: Physical sciencesGeneral Relativity and Quantum Cosmology (gr-qc)Astrophysics::Cosmology and Extragalactic AstrophysicsGravity wavesBayesianGravimeterselectromagnetic field: productionPhysics and Astronomy (all)galaxy: binary0103 physical sciencesddc:530SDG 7 - Affordable and Clean Energy010306 general physicsgravitational radiation: frequencySTFCAstrophysics::Galaxy Astrophysicsequation of stateLIGHT CURVESEquation of stateScience & Technology/dk/atira/pure/sustainabledevelopmentgoals/affordable_and_clean_energySpinsgravitational radiationRCUKSpectral densityKILONOVATRANSIENTSbinary: compactStarsGEO600GalaxyLIGOgravitational radiation detectorNeutron starVIRGOPhysics and Astronomygravitational radiation: emissionRADIATIONBayesian AnalysisDewey Decimal Classification::500 | Naturwissenschaften::530 | Physik[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
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Medicīna (Latvijas Universitātes Raksti; 812 sēj.)  

2016

Atbalsta vektora analīze:MEDICINE [Research Subject Categories]Ļaundabīgie audzējiMezenhimālās cilmes šūnasHronisks pankreatītsPeripheral arterial diseaseBiodegradējamie filleriKapoši sarkomaĀdas vēzisPsoriāzeS. epidermidis
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Compact two-electron wave function for bond dissociation and Van der Waals interactions: A natural amplitude assessment

2014

Electron correlations in molecules can be divided in short range dynamical correlations, long range Van der Waals type interactions and near degeneracy static correlations. In this work we analyze for a one-dimensional model of a two-electron system how these three types of correlations can be incorporated in a simple wave function of restricted functional form consisting of an orbital product multiplied by a single correlation function $f(r_{12})$ depending on the interelectronic distance $r_{12}$. Since the three types of correlations mentioned lead to different signatures in terms of the natural orbital (NO) amplitudes in two-electron systems we make an analysis of the wave function in t…

Atomic Physics (physics.atom-ph)General Physics and AstronomyFOS: Physical sciencesPhysics - Atomic Physicssymbols.namesakeCondensed Matter - Strongly Correlated ElectronsAtomic orbitalQuantum mechanicsPhysics - Chemical PhysicsPhysics::Atomic PhysicsSDG 7 - Affordable and Clean EnergyPhysical and Theoretical ChemistryWave functionAnsatzPhysicsChemical Physics (physics.chem-ph)Quantum Physics/dk/atira/pure/sustainabledevelopmentgoals/affordable_and_clean_energyta114Electronic correlationStrongly Correlated Electrons (cond-mat.str-el)Computational Physics (physics.comp-ph)Diatomic molecule3. Good healthBond lengthAmplitudesymbolsvan der Waals forceQuantum Physics (quant-ph)Physics - Computational Physics
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Matemātisko prasmju attīstības veicināšana 5-6 gadus veciem bērniem āra nodarbību laikā pirmsskolas izglītības iestādē

2021

Bakalaura darba autore: Linda Erdmane. Bakalaura darba vadītāja: Tija Zīriņa. Temats: Matemātisko prasmju attīstības veicināšana 5-6 gadus veciem bērniem āra nodarbību laikā pirmsskolas izglītības iestādē. Pētījuma priekšmets: 5-6 gadu vecu bērnu matemātisko prasmju attīstība. Pētījuma mērķis: Pētīt 5-6 gadu vecu bērnu matemātisko prasmju attīstību āra nodarbību laikā. Darba saturs: 50 lpp., 3 tabulas, 3 attēli. Bakalaura darbā tiek pētīta 5-6 gadus vecu bērnu matemātisko prasmju attīstība un tās izmaiņas āra nodarbību un izmēģinājumdarbības laikā pirmsskolas izglītības iestādē. Bakalaura darba teorētiskajā daļā tiek pētīta atbilstoša literatūra trijās valodās. Informācija apkopota 5 apakšn…

AttīstībaSkolas pedagoģijaMatemātikas joma5-6 gadus veci bērniBrīvdabas pedagoģijaDabas deficīta sindroms
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Ekoloģiskā audzināšana dabas nodarbībās

2022

Ekoloģiskā audzināšana ir temats, kurš mūsdienās kļuvis aizvien aktuālāks ne tikai skolas vecuma bērniem, bet arī tiem, kuri mācās pirmsskolas izglītības iestādēs. Primāri tiek vērsta uzmanība tam, lai bērna attieksme pret dabu un tās vērtībām būtu saudzējoša un vislabāk to iemācīt var āra nodarbībās tiešā saskarsmē ar dabu. Darba mērķis ir izpētīt ekoloģiskās audzināšanas iespējas dabas nodarbībās, tās nozīmību un aktualitāti pirmsskolas izglītības iestādēs. Lai šo mērķi sasniegtu autore izvirza sekojošus uzdevumus mērķa sasniegšanai: •Analizēt pedagoģisko un psiholoģisko literatūru par ekoloģisko audzināšanu un tās iespējām pirmsskolas vecuma bērniem; •Analizēt pedagoģisko literatūru par …

AudzināšanaBērnsEkoloģijaDabaSkolas pedagoģija
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Jūras piekrastes augu dīgšanas ekofizioloģija: sēklu miera periods un vides faktoru ietekme

2012

Darba mērķis ir raksturot dažādu piekrastes biotopu augu sēklu miera periodu un dažādu vides faktoru ietekmi uz to dīgšanu. Augu sēklas ievāca Baltijas jūras piekrastē (Kurzeme) un Rīgas jūras līča piekrastē. Vienā no diedzēšanas eksperimentiem izmantoja sēklas no Millenium Seed Bank (RBG Kew, Lielbritānija) kolekcijas. Diedzēšanas eksperimentus veica LU Bioloģijas fakultātē no 2005. līdz 2009. gadam un MSB laboratorijā 2009. gadā. Ir noteikts un raksturots sēklu organiskā miera perioda (OMP) veids vairākām piejūras mitrāju un kāpu augu sugām, kā arī raksturota NaCl ietekme uz šo sugu sēklu dīgšanu. Juncus balticus un Triglochin maritima sēklām ir salīdzināta NaCl un polietilēnglikola (PEG)…

Augu fizioloģijaDzīvās dabas zinātnesBioloģija
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Simulation-Based Analysis of "What-If" Scenarios with Connected and Automated Vehicles Navigating Roundabouts.

2022

Despite the potential of connected and automated vehicles (CAVs), there are still many open questions on how road capacity can be influenced and what methods can be used to assess its expected benefits in the progressive transition towards fully cooperative driving. This paper contributes to a better understanding of the benefits of CAV technologies by investigating mobility-related issues of automated vehicles operating with a cooperative adaptive cruise control system on roundabout efficiency using microscopic traffic simulation. The availability of the adjustment factors for CAVs provided by the 2022 Highway Capacity Manual allowed to adjust the entry capacity equations to reflect the pr…

Automobile Drivingmicroscopic simulationAccidents TrafficBiochemistryAutonomous VehiclesAtomic and Molecular Physics and OpticsAnalytical ChemistryRoad infrastructureroundaboutSettore ICAR/04 - Strade Ferrovie Ed AeroportiComputer Simulationconnected automated vehiclesElectrical and Electronic EngineeringSafetyInstrumentationentry capacitySensors (Basel, Switzerland)
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Angular analysis of charged and neutral B → Kμ + μ − decays

2014

The angular distributions of the rare decays B → K+µ+µ- and B0 → K0 <inf>a</inf>Sμ+μ- are studied with data corresponding to 3 fb-1 of integrated luminosity, collected in proton-proton collisions at 7 and 8TeV centre-of-mass energies with the LHCb detector. The angular distribution is described by two parameters, FH and the forward-backward asymmetry of the dimuon system AFB, which are determined in bins of the dimuon mass squared. The parameter F<inf>H</inf> is a measure of the contribution from (pseudo)scalar and tensor amplitudes to the decay width. The measurements of A<inf>FB</inf> and F<inf>H</inf> reported here are the most precise to d…

B physic12.15.MmB physicsSettore FIS/04 - Fisica Nucleare e SubnucleareLuminosityNeutral currentFlavor physicsMathematics::ProbabilityNuclear Experimentmedia_commonPhysicsB physics; Flavor physics; Flavour changing neutral currents; Hadron-hadron scattering; Rare decayPhysicsPHYSICS PARTICLES & FIELDSParticle physicsAmplitudePhysical SciencesFísica nuclearLHCNuclear and High Energy PhysicsParticle physicsmedia_common.quotation_subject14.40.NdScalar (mathematics)Flavour Changing Neutral CurrentsMathematics::Analysis of PDEsLHCb - Abteilung HofmannHadronsMeasure (mathematics)AsymmetryMathematics::Numerical AnalysisStandard ModelAngular distributionTheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITYLeptonic semileptonic and radiative decays of bottom mesonSDG 7 - Affordable and Clean EnergyTensorLarge Hadron Collider (France and Switzerland)Science & Technology/dk/atira/pure/sustainabledevelopmentgoals/affordable_and_clean_energyHadron-Hadron ScatteringGran Col·lisionador d'HadronsFlavour changing neutral currentLHCbRare decay13.20.HeFlavor physicBottom mesons (|B|>0)High Energy Physics::ExperimentFísica de partículesExperiments
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