نتایج جستجو برای: electronic spatial extent

تعداد نتایج: 770167  

Journal: :Journal of chemical theory and computation 2013
Iffat H Nayyar Enrique R Batista Sergei Tretiak Avadh Saxena Darryl L Smith Richard L Martin

Five different Density Functional Theory (DFT) models (ranging from pure GGA to long-range-corrected hybrid functionals) were used to study computationally the nature of the self-trapped electronic states in oligophenylene vinylenes. The electronic excitations in question include the lowest singlet (S1) and triplet (T1(†)) excitons (calculated using Time Dependent DFT (TD-DFT) method), positive...

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    Urban planning has gone from the past to the present day to a greater extent based on physical factors, to the extent that the basis of urban planning plans and urban plans influenced urban development and physical spaces. It's The city is the product of complex economic and social relations and its spatial heterogeneity reflects the processes of widespread socio-economic-cultural-social ...

Journal: :Journal of Space Weather and Space Climate 2023

Context: The main challenge in atmospheric ionisation modelling is that sparse measurements are used to derive a global precipitation pattern. Typically this requires intense interpolation or scaling of long-term average maps. In some regions however, the particle flux might be similar and combination these would not limit results even though it dramatically improve spatial temporal data covera...

Journal: :Proceedings of the National Academy of Sciences 2013

Journal: :Science of The Total Environment 2021

Roads form vast, pervasive and growing networks across the Earth, causing negative environmental impacts that spill out into a ‘road-effect zone’. Previous research has estimated regional global extent of these zones using arbitrary distances, ignoring spatial distribution distance-dependent attenuation different forms road impact. With Great Britain as study area, we used mapping roads realist...

Journal: :Physical review letters 2007
Karen L van der Molen R Willem Tjerkstra Allard P Mosk Ad Lagendijk

We have experimentally studied the distribution of the spatial extent of modes and the crossover from essentially single-mode to distinctly multimode behavior inside a porous gallium phosphide random laser. This system serves as a paragon for random lasers due to its exemplary high index contrast. In the multimode regime, we observed mode competition. We have measured the distribution of spectr...

Journal: :NeuroImage 2003
Ziad S Saad Kristina M Ropella Edgar A DeYoe Peter A Bandettini

Functional magnetic resonance imaging is routinely used to localize brain function, with multiple brain scans averaged together to reveal activation volumes. In this study, we examine the seldom-studied effect of multiple scan averaging on the extent of activation volume. Using restricted visual field stimulation, we obtained a large number of scan repetitions and analyzed changes in activation...

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