Search results for " Functional"

Warunki zamieszkiwania w miejskich obszarach funkcjonalnych w Polsce

2016

Warunki zamieszkania stanowią bardzo ważny element oceny jakości i poziomu życia. Ich kształtowanie ma duże znaczenie w przypadku budowania i rozwoju miejskich obszarów funkcjonalnych. Celem pracy jest identyfikacja przestrzennego zróżnicowania warunków zamieszkania w miejskich obszarach funkcjonalnych w Polsce. Badania dotyczą roku 2013 i obejmują wszystkie obszary funkcjonalne Polski ukształtowane wokół ośrodków wojewódzkich. Analizę prowadzono z wykorzystaniem taksonomicznej odległości od wzorca Hellwiga w następujących układach przestrzennych: miejskie obszary funkcjonalne jako całości, ośrodki centralne a strefy zewnętrzne obszarów funkcjonalnych oraz układ gminny. Wyniki badań wskazuj…

Miejskie obszary funkcjonalne a kształtowanie spójności terytorialnej

2017

Bieżąca polityka regionalna ma za zadanie kształtować spójność terytorialną, a jedną z jej koncepcji jest funkcjonowanie miejskich obszarów funkcjonalnych. Spójność terytorialna rozumiana jest różnorako. W niniejszym opracowaniu rozpatrywano ją jako: rozwój endogeniczny i policentryczny, wyrównywanie dysproporcji w poziomie rozwoju społeczno-gospodarczego, tworzenie powiązań sieciowych oraz zapewnienie dostępności do usług (głównie wiedzy i infrastruktury). Celem badań jest określenie związku między isto - tą i praktyką miejskich obszarów funkcjonalnych a kształtowaniem tak pojmowanej spójno - ści terytorialnej. Badania przeprowadzono w układzie regionalnym, na podstawie miejskich obszarów …

Defying Stereotypes with Nanodiamonds: Stable Primary Diamondoid Phosphines

2016

International audience; Direct unequal C-H bond difunctionalization of phosphorylated diamantane was achieved in high yield from the corresponding phosphonates. Reduction of the functionalized phosphonates provides access to novel primary and secondary alkyl/aryl diamantane phosphines. The prepared primary diamantyl phosphines are quite air stable compared to their adamantyl and especially alkyl or aryl analogues. This finding is corroborated by comparing the singly occupied molecular orbital energy levels of the corresponding phosphine radical cations obtained by density functional theory computations.

Molecular methods to evaluate AMF functionality in soil and in roots

2005

International audience

The role of plant-animal and plant-plant interactions in vegetation dynamics and ecological restoration in a Mediterranean landscape

Localized surface plasmon resonance in silver nanoparticles: Atomistic first-principles time-dependent density-functional theory calculations

2015

We observe using ab initio methods that localized surface plasmon resonances in icosahedral silver nanoparticles enter the asymptotic region already between diameters of 1 and 2 nm, converging close to the classical quasistatic limit around 3.4 eV. We base the observation on time-dependent density-functional theory simulations of the icosahedral silver clusters Ag$_{55}$ (1.06 nm), Ag$_{147}$ (1.60 nm), Ag$_{309}$ (2.14 nm), and Ag$_{561}$ (2.68 nm). The simulation method combines the adiabatic GLLB-SC exchange-correlation functional with real time propagation in an atomic orbital basis set using the projector-augmented wave method. The method has been implemented for the electron structure…

Addition of Ethylene or Hydrogen to a Main-Group Metal Cluster under Mild Conditions

2015

Reaction of the tin cluster Sn8(Arinline image)4 (Arinline image=C6H2-2,6-(C6H3-2,4,6-Me3)2) with excess ethylene or dihydrogen at 25 °C/1 atmosphere yielded two new clusters that incorporated ethylene or hydrogen. The reaction with ethylene yielded Sn4(Arinline image)4(C2H2)5 that contained five ethylene moieties bridging four aryl substituted tin atoms and one tin–tin bond. Reaction with H2 produced a cyclic tin species of formula (Sn(H)Arinline image)4, which could also be synthesized by the reaction of {(Arinline image)Sn(μ-Cl)}2 with DIBAL-H. These reactions represent the first instances of direct reactions of isolable main-group clusters with ethylene or hydrogen under mild conditions…

Self-reported life-space mobility in the first year after ischemic stroke: longitudinal findings from the MOBITEC-Stroke project

2023

Abstract Background Life-space mobility is defined as the size of the area in which a person moves about within a specified period of time. Our study aimed to characterize life-space mobility, identify factors associated with its course, and detect typical trajectories in the first year after ischemic stroke. Methods MOBITEC-Stroke (ISRCTN85999967; 13/08/2020) was a cohort study with assessments performed 3, 6, 9 and 12 months after stroke onset. We applied linear mixed effects models (LMMs) with life-space mobility (Life-Space Assessment; LSA) as outcome and time point, sex, age, pre-stroke mobility limitation, stroke severity (National Institutes of Health Stroke Scale; NIHSS), modified R…

Detecting clusters in spatially correlated waveforms

2017

Seismic networks often record signals characterized by similar shapes that provide important information according to their geographic positions. We propose an approach to identify homogeneous clusters of seismic waves, combining analysis of waveforms with metadata and spectrogram information. In waveforms clustering, cross-correlation measures between signals may presents some limitations, so we refer to more recent contributes relating data-depth based clustering analysis. The mechanism for alignment is also an important topic of the analysis: warping (or aligning) procedures identify nuisance effects in phase variation, that, if ignored, may result in a possible loss of information and t…

Gallium preference for the occupation of tetrahedral sites in Lu3(Al5-xGax)O12multicomponent garnet scintillators according to solid-state nuclear ma…

2019

Abstract In this study, the distributions of aluminum and gallium atoms over the tetrahedral and octahedral sites in the garnet structure were investigated in mixed Lu3Al5-xGaxO12 crystals by using 27Al and 71Ga magic angle spinning nuclear magnetic resonance (NMR) and single crystal 71Ga NMR. The experimental study was supported by theoretical calculations based on density functional theory (DFT) in order to predict the trends in terms of the substitutions of Al by Ga in the mixed garnets. Both the experimental and theoretical results indicated the non-uniform distribution of Al and Ga over the tetrahedral and octahedral sites in the garnet structure, with a strong preference for Ga occupy…