Results 101 to 110 of about 1,316,650 (313)

Is the evidence for dark energy secure? [PDF]

General Relativity and Gravitation, 2007
Several kinds of astronomical observations, interpreted in the framework of the standard Friedmann-Robertson-Walker cosmology, have indicated that our universe is dominated by a Cosmological Constant. The dimming of distant Type Ia supernovae suggests that the expansion rate is accelerating, as if driven by vacuum energy, and this has been indirectly ...
openaire   +4 more sources

Experimental and Theoretical Confirmation of Covalent Bonding in α‐Pu

Advanced Functional Materials, EarlyView.
From a combination of Reverse Monte Carlo dynamic rigid body fitting to the pair distribution functional and novel density functional approaches, the existence of covalent bonding is confirmed in α‐plutonium alongside other bonding types (i.e. mixed bonding schemes).
Alexander R. Muñoz, Matthew S. Cook, David C. Arellano, AM Milinda Abeykoon, Jeremy N. Mitchell, Sarah C. Hernandez, Eric D. Bauer, Christopher A. Mizzi, Boris Maiorov, Neil Harrison, W. Adam Phelan   +10 more
wiley   +1 more source

Virtual radioactive source system for exercises modeling high doses

Nukleonika
This article presents the possibilities of working in a virtual high-dose rate field following a procedure developed at the Nuclear Security Department of the Centre for Energy Research (EK NSD) in Budapest. Real-life simulation of a radiation survey and
Bodor Károly, Csalótzky Zsolt, Pető János, Völgyesi Péter, Gulyás Attila, Kaposy Nándor, Zagyvai Péter   +6 more
doaj   +1 more source

An ultra-fast MMC-HVDC fault location algorithm based on transient voltage features and regression neural network

International Journal of Electrical Power & Energy Systems
An ultra-fast fault location algorithm based on the single-ended transient voltage features and regression neural network (RNN) is proposed, which utilizes 2.5 ms postfualt data window and is suitable for modular multilevel converter-based high-voltage ...
Yunqi Zhang, Yue Yu, Guosheng Yang
doaj   +1 more source

The concept of energy security: Beyond the four As

Energy Policy, 2014
AbstractEnergy security studies have expanded from their classic beginnings following the 1970s oil crises to encompass various energy sectors and increasingly diverse issues. This viewpoint contributes to the re-examination of the meaning of energy security that has accompanied this expansion.
Jessica Jewell, Aleh Cherp, Aleh Cherp
openaire   +5 more sources

Electro‐Active Metasurfaces Controlling Exceptional Topological Phase Through Low‐Voltage Operation on Conductive Polymer

Advanced Functional Materials, EarlyView.
This research investigates an electro‐active chiral optical response (EACOR)‐driven dual‐channel metasurfaces with fast electrical switching rates of 52 ms, and a low operating voltage of 0.5 V. The combination of polyaniline (PANI) thin film and the exceptional topological (ET) phase of chiral gold (Au) meta‐atoms modulate holographic images through ...
Jaekyung Kim, Minsu Jeong, Chunghwan Jung, Junhwa Seong, Junsuk Rho   +4 more
wiley   +1 more source

Enhancing Indoor Photovoltaic Efficiency to 37.6% Through Triple Passivation Reassembly and n‐Type to p‐Type Modulation in Wide Bandgap Perovskites

Advanced Functional Materials, EarlyView.
Triple Passivation Treatment (TPT) strategy enables 1.75 eV wide‐bandgap perovskite solar cells (WB‐PSCs) with suppressed halide phase segregation and n‐to‐p type surface transition. The photoluminescence quantum yield increases from 0.5 to 2.1%, indicating reduced non‐radiative losses.
Siming Huang, Shanyue Hou, Galyam Sanfo, Jingdong Xu, Yuting Wang, Himal Muwanwella, Lukas Pfeifer, Xiang Liu, Shaik M Zakeeruddin, Yuelong Huang, Michael Grätzel, Muhammad Tariq Sajjad, Mojtaba Abdi‐Jalebi   +12 more
wiley   +1 more source

Research Progress on Power Visual Detection of Overhead Line Bolt Defects Based on UAV Images

Drones
In natural environments, the connecting bolts of overhead lines and power towers are prone to loosening and missing, posing potential risks to the safe and stable operation of the power system.
Xinlan Deng, Min He, Jingwen Zheng, Liang Qin, Kaipei Liu   +4 more
doaj   +1 more source

Monitoring the Implementation of State Regulation of National Economic Security [PDF]

Problemi Ekonomiki, 2018
The aim of the article is to improve the methodological tools for monitoring the implementation of state regulation of national economic security. The approaches to defining the essence of the concept of “national economic security” are generalized ...
Hubarieva Iryna O.
doaj  

Copper‐based Materials for Photo and Electrocatalytic Process: Advancing Renewable Energy and Environmental Applications

Advanced Functional Materials, EarlyView.
Cu‐based catalysts as a cornerstone in advancing sustainable energy technologies are fully reviewed in this manuscript, highlighting their potential in photo‐ and electrocatalysis. It includes metallic copper, copper oxides, copper sulfides, copper halide perovskites, copper‐based metal–organic frameworks (MOFs), and covalent organic frameworks (COFs),
Jéssica C. de Almeida, Yanjie Wang, Thais A. Rodrigues, Paulo H. H. Nunes, Vagner R. de Mendonça, Paulo H. E. Falsetti, Leticia V. Savazi, Tao He, Alexandra V. Bardakova, Aida V. Rudakova, Jie Tian, Alexei V. Emeline, Osmando F. Lopes, Antonio Otavio T. Patrocínio, Jia Hong Pan, Caue Ribeiro, Detlef W. Bahnemann   +16 more
wiley   +1 more source