Results 21 to 30 of about 8,343 (262)
Search for ferromagnetism in Mn-doped lead halide perovskites
Communications Physics, 2023 Lead halide perovskites are new key materials in various application areas such as high efficiency photovoltaics, lighting, and photodetectors. Doping with Mn, which is known to enhance the stability, has recently been reported to lead to ferromagnetism ...
Maryam Sajedi +8 more
doaj +1 more source
On Energy and Laplacian Energy of Graphs
The Electronic Journal of Linear Algebra, 2016 Let $G=(V,E)$ be a simple graph of order $n$ with $m$ edges. The energy of a graph $G$, denoted by $\mathcal{E}(G)$, is defined as the sum of the absolute values of all eigenvalues of $G$. The Laplacian energy of the graph $G$ is defined as \[ LE = LE(G)=\sum^n_{i=1}\left|\mu_i-\frac{2m}{n}\right| \] where $\mu_1,\,\mu_2,\,\ldots,\,\mu_{n-1 ...
Das, Kinkar Ch., Mojalal, Seyed Ahmad
openaire +1 more source
Ekonomika středověké těžby pomocí ohně či dláta : otázka energie
Archaeologia HistoricaPřed zavedením výbušnin v Evropě existovaly dva základní způsoby těžby: pomocí ohně a nástrojů, z nichž nejběžnější byly kladivo a dláto. Používání dřeva, a tedy i ohně, lze vysledovat až do protohistorických dob.
Florence Maqueda +2 more
doaj +1 more source
Úvodník letošního prvního čísla časopisu Bedrník
Envigogika, 2010 Co je inteligentní využívání energie?Uspokojování základních energetických potřeb jednotlivců a společnosti, které: využívá co nejmenšího množství primární energie, zaručuje snížení energetických a ekonomických nákladů pro konečného uživatele, snižuje ...
Hana Kolářová
doaj +1 more source
Stability follows efficiency based on the analysis of a large perovskite solar cells ageing dataset
Nature Communications, 2023 While perovskite solar cells have reached competitive efficiency values during the last decade, stability issues remain a critical challenge to be addressed for pushing this technology towards commercialisation.
Noor Titan Putri Hartono +6 more
doaj +1 more source
Esprimere le energie dei paesaggi
Ri-vista: Ricerche per la Progettazione del Paesaggio, 2023 Sezione NEWS (senza abstract) Recensione / Informazione sul libro: Stremke S., Oudes D., Picchi P., (eds) 2022, Power of landscape.
Gabriele Paolinelli
doaj +1 more source
Energetické a materiální toky při výrobě a užití středověké až novověké keramiky
Archaeologia HistoricaHrnčíři při výrobě keramiky interagovali s řadou materiálů, které dokázali přetvořit v pevnou hmotu a výrobek s funkčními, formálními a stylistickými vlastnostmi.
Ladislav Čapek
doaj +1 more source
Advanced Functional Materials, EarlyView.We investigate size‐dependent CO selectivity on Ag nanoparticles, where optimized Ag loading achieves nearly 100% Faradaic Efficiency for CO at −100 mA·cm−2. In situ SERS and XPS reveal the crucial role of optimized loading in catalytic performance. The Ag/C catalyst further exhibits bifunctional activity, enabling efficient electrolysis of CO2 and ...
Venkata S. R. K. Tandava +16 more
wiley +1 more source
Comparing energy and Randic energy
Macedonian Journal of Chemistry and Chemical Engineering, 2013 The recently conceived Randić energy (RE) is examined, and its relation to the (earlier much studied) total π-electron energy (E) is investigated. Within classes of molecular graphs, there exists a relatively good (increasing) linear correlation between RE and E.
Furtula, Boris, Gutman I.
openaire +4 more sources
Graded Metallopolymer Structures with Shape‐Memory Abilities via DLP‐Based 3D‐Printing
Advanced Functional Materials, EarlyView.This study presents the digital light processing (DLP) based 3D printing of graded metallopolymers featuring shape‐memory abilities. The permanent shape can be recovered in two distinct steps with excellent rates. The obtained graded prints range from simple rod‐like structures to complex hollow materials.
Michael Klein +6 more
wiley +1 more source