Results 81 to 90 of about 2,702 (215)

Photovoltaic Effect in a III‐IV‐V Compound Semiconductor

Progress in Photovoltaics: Research and Applications, EarlyView.
A large reduction of the GaAs band gap is obtained with incorporation of 6.5% Ge during epitaxy without introducing extended defects or composition inhomogeneity. Heterojunction solar cell devices were fabricated with 0.76‐V open circuit voltage and an internal quantum efficiency above 40% at energies below the bandgap of the GaAs emitter.
José M. Ripalda, Pablo Caño, Micaela Rodriguez‐Peña, Miguel Angel Sevillano‐Bendezú, Aurelia Trevisan, Raghavendra Juluri, Aitana Cano, Iván García, Alicia Gonzalo, Enrique Navarro, Jeronimo Buencuerpo, Paul Koenraad, Ana María Sanchez, Yolanda Gonzalez   +13 more
wiley   +1 more source

Lower-dimensional Gauss-Bonnet gravity black holes with quintessence

Nuclear Physics B
In this paper, we study the D → 3 limit of Gauss-Bonnet gravity with quintessential matter, obtaining exact solutions that extend the BTZ metric through higher-curvature terms and quintessence coupling.
G. Alencar, T.M. Crispim, J. Macedo, C.R. Muniz   +3 more
doaj   +1 more source

The benefits of a hybrid‐3DEnVar data assimilation scheme for the convection‐permitting NWP model AROME–Austria

Quarterly Journal of the Royal Meteorological Society, EarlyView.
The climatological‐error covariance matrix used in three‐dimensional variational data assimilation (3DVar) provides smooth and isotropic increments spread to long distances. In contrast, three‐dimensional ensemble variational data assimilation (3DEnVar) with a purely ensemble‐error covariance matrix provides inhomogeneous increments and contains the ...
Kaushambi Jyoti, Philipp Griewank, Florian Meier, Martin Weissmann   +3 more
wiley   +1 more source

Gauss–Bonnet effects in $$f(R,\Sigma ,T)$$ f ( R , Σ , T ) gravity

European Physical Journal C: Particles and Fields
We investigate the cosmological dynamics of Parameterized Absolute Parallelism (PAP) geometry within the framework of modified $$f(R,\Sigma ,T)$$ f ( R , Σ , T ) gravity.
Tahia F. Dabash, A. Eid, M. A. Bakry
doaj   +1 more source

A radiating star in Einstein-Gauss-Bonnet gravity

Nuclear Physics B
We generate a radiating star in Einstein-Gauss-Bonnet (EGB) gravity for spacetime dimension N=5 and a shear-free geometry. The temporal boundary condition contains curvature corrections from the Lovelock tensor and reduces to the general relativity limit.
Sunil D. Maharaj, Byron P. Brassel, Sumeekha Singh, Keshlan S. Govinder   +3 more
doaj   +1 more source

Magneto‐Electrodeposition and Field‐Enhanced Ion Transport in Zn‐MnO2 Batteries

Small, EarlyView.
Magneto‐electrodeposition (MED) strategy to improve the deposition uniformity and subsequent performance of MnO2 cathodes for aqueous Zn‐MnO2 batteries. Internal magnetic fields operating during battery cycling stabilize Zn anode and promote enhanced ion transportation, leading to enhanced initial areal capacities.
Pedaballi Sireesha, William T. McLeod, Kaylie A. McCracken, Jeffrey G. Bell   +3 more
wiley   +1 more source

Rigidity theorems of Clifford Torus

Anais da Academia Brasileira de Ciências, 2001
Let M be an n-dimensional closed minimally immersed hypersurface in the unit sphere Sn + 1. Assume in addition that M has constant scalar curvature or constant Gauss-Kronecker curvature. In this note we announce that if M has (n - 1) principal curvatures
SOUSA JR. LUIZ A. M.
doaj  

A Novel Approach to Energy Management in Electric Steelworks

steel research international, EarlyView.
Feed‐forward neural networks are exploited to estimate electric energy consumptions of the electric arc furnace and ladle furnace processes. The models are used to optimize production schedule so that more energy intensive grades are produced when the cost of energy is lower.
Valentina Colla, Stefano Dettori, Silvia Cateni, Marco Vannucci, Antonella Vignali, Claudio Mocci, Irene Dovichi, Davide Chionna, Lorenzo Vannini, Enrico Paluzzano, Costanzo Pietrosanti, Davide Onesti, Daniele Venier   +12 more
wiley   +1 more source

Assessing the fire resistance of damaged reinforced concrete frames: A comparative study between 2D and 3D frames

Structural Concrete, EarlyView.
Abstract Post‐earthquake fires pose a significant threat to urban environments, with potentially catastrophic consequences for buildings and infrastructure. To enhance understanding and mitigate these risks, this study conducts a comparative analysis of post‐earthquake fire (PEF) in two‐dimensional (2D) and three‐dimensional (3D) reinforced concrete ...
Hugo Vitorino, Paulo Vila Real, Carlos Couto, Hugo Rodrigues   +3 more
wiley   +1 more source

Neutral surfaces in neutral four-spaces

Le Matematiche, 1990
Properties of the Gauss map of neutral surfaces are studied. Special attention is given to surfaces of parallel, or zero, mean curvature. Bilagrangian structures are defined and used in ways analogous to the use of complex structures in the Riemannian ...
Gary Jensen, Marco Rigoli
doaj