Results 31 to 40 of about 7,623 (223)

Rural depopulation, social resilience and context costs in the border municipalities of central Portugal. Dichotomies of social reorganization vs absence of public policies

Economía Agraria y Recursos Naturales, 2019
The border territories of the central region of Portugal with Castilla y Leon and Extremadura in Spain have been experiencing, during the last decades, depopulation dynamics and socioeconomic reorganizations that transformed the forms of work, the models
Gonçalo Poeta Fernandes
doaj   +1 more source

Photon Avalanching Nanoparticles: The Next Generation of Upconverting Nanomaterials?

Advanced Functional Materials, EarlyView.
This Perspective outlines the mechanistic foundations that enable photon‐avalanche (PA) behavior in lanthanide nanomaterials and contrasts them with emerging application spaces and forward‐looking design strategies. By bridging threshold engineering, energy‐transfer dynamics, and materials engineering, we provide a coherent roadmap for advancing the ...
Kimoon Lee, Yunseo Kim, Hyeong‐ku Jo, Dongjoon Yoon, Byeonghyeok Im, WonJeong Yu, Eui‐Rim On, Changhwan Lee   +7 more
wiley   +1 more source

Charge Transfer States in Donor–Acceptor Bulk‐Heterojunctions as Triplet–Triplet Annihilation Sensitizer for Solid‐State Photon Upconversion

Advanced Materials Interfaces, EarlyView.
A near‐infrared photosensitizer that facilitates efficient solid‐state photon upconversion by recycling triplets formed within a fullerene‐based donor–acceptor bulk‐heterojunction system is demonstrated. Spectroscopic investigations reveal that the energy of photogenerated charge transfer states of triplet character (3CT) is subsequently transferred to
Maciej Klein, Alexander R. Ireland, Evan G. Moore, Dennis Delic, Ajay K. Pandey   +4 more
wiley   +1 more source

Les territoires industriels face aux effets cumulés du déclin démographique et économique : quelles perspectives avec la métropolisation ?

Espace populations sociétés, 2016
Despite its demographic growth, France faces depopulation over part of its territory. In this country, demographic decline is confined to a few rural areas or old industrial regions.
Brice Laménie
doaj   +1 more source

Design of Molecular Lanthanide‐Based Quantum Light Sources for On‐Chip Integration

Advanced Optical Materials, EarlyView.
Rigid lanthanide complexes with a tetrapodal tris‐benzimidazolic ligand exhibit narrow, well‐resolved visible/NIR emission profiles suitable for quantum photonics. The EuL complex features an exceptionally sharp 5D₀→7F₀ transition enabled by an LMCT mechanism that suppresses inhomogeneous broadening.
Silvia Bonabello, Rodolpho Alessandro Nesta Silva, Dimitrije Mara, Fabio Travagin, Marzia Petreti, Marco Saccone, Matteo Melegari, Luciano Marchiò, Luca Pilia, Giovanni Battista Giovenzana, Flavia Artizzu   +10 more
wiley   +1 more source

Thermally Modulated Specular Phonon Transport in a High‐Debye‐Temperature Diamond Nanobeam

Advanced Science, EarlyView.
Thermal transport in single‐crystal diamond nanobeams is measured from 140 to 300 K using electro‐thermal micro‐suspended structures. The thermal conductivity shows an increasing deviation from Boltzmann transport predictions assuming fully diffuse boundary scattering at lower temperatures.
Seohee Jang, Seung‐Woo Jeon, Takuma Shiga, Jeeyoung Shin, Sangwook Han, Woosung Park   +5 more
wiley   +1 more source

Does urban shrinkage require urban policy? The case of a post-industrial region in Poland

Regional Studies, Regional Science, 2020
The problem of depopulation in towns is present in most European countries. In Central and Eastern Europe it emerged primarily after the political transformation at the turn of the 1980s and 1990s.
Anna Runge, Jerzy Runge, Iwona Kantor-Pietraga, Robert Krzysztofik   +3 more
doaj   +1 more source

Electrically Tunable Room‐Temperature Microwave Oscillations in GaN/AlN Triple‐Barrier Resonant Tunneling Diodes

Advanced Electronic Materials, EarlyView.
III‐nitride semiconductors have revolutionized optoelectronics, enabling transformative technologies such as high‐efficiency LEDs and lasers. However, their use in intersubband optoelectronics has remained limited. This work marks an important step forward by demonstrating highly coherent inter‐well resonant tunneling injection in III‐nitride ...
Jimy Encomendero, Naomi Pieczulewski, Eegene Chung, Vladimir Protasenko, David A. Muller, Debdeep Jena, Huili Grace Xing   +6 more
wiley   +1 more source

Depopulation trends of rural areas of the Russian Federation according to the Russian Census 2020

Наука. Культура. Общество, 2022
Based on the published data of the Russian Census 2020, as well as previous population censuses, the article calculates the dynamics of the rural population in all federal districts and constituent entities of the Russian Federation. The rural population
Vadim A. Bezverbny, Andrey N. Maksimov
doaj   +1 more source

Synergetic Lattice and Surface Engineering: Stable High‐Voltage Cycle Performance in P3‐Type Layered Manganese Oxide

Advanced Energy Materials, EarlyView.
A dual lattice‐surface strategy employing NaTi2(PO4)3 is adopted to enhance the performance of P3‐type Na0.67[Zn0.3Mn0.7]O2, whereby Ti stabilizes the bulk lattice and surface P species mitigate degradation, collectively improving high‐voltage cycling stability, Na+ diffusion, and oxygen redox reversibility through synergistic structural and ...
Natalia Voronina, Konstantin Köster, Jun Ho Yu, Sungkyu Kim, A‐Yeon Kim, Hun‐Gi Jung, Kyuwook Ihm, Koji Yazawa, Hitoshi Yashiro, Aishuak Konarov, Mark Huijben, Olivier Guillon, Payam Kaghazchi, Seung‐Taek Myung   +13 more
wiley   +1 more source