Results 71 to 80 of about 1,718,501 (292)

Gravity Models of the Intra-EU Trade: Application of the Hausman-Taylor Estimation in Heterogeneous Panels with Common Time-specific Factors [PDF]

In this paper we follow recent developments of panel data studies and explicitly allow for the existence of unobserved common time-specific factors where their individual responses are also allowed to be heterogeneous across cross section units.
Laura Serlenga, Yongcheol Shin
core  

Quantum Analysis of Jackiw and Teitelboim's Model for 1+1 D Gravity and Topological Gauge Theory

, 1992
We study the BRST quantization of the 1+1 dimensional gravity model proposed by Jackiw and Teitelboim and also the topological gauge model which is equivalent to the gravity model at least classically.
Achúcarro, Bershadsky, Chamseddine, Chamseddine, Chamseddine, Curtright, D'Hooker, D'Hooker, D'Hooker, David, Distler, Eguchi, Fujikawa, Fujikawa, Fukuyama, Gervais, Gervais, Gervais, Gervais, Gervais, Haruhiko Terao, Henneaux, Isler, Jackiw, Knizhnik, Komata, Polyakov, Polyakov, Teitelboim, Terao, Witten, Yamada, Yoneya   +32 more
core   +1 more source

3D Bioinspired Hair‐Based Solar Evaporator for Efficient Water Harvesting

Advanced Functional Materials, EarlyView.
A bio‐derived solar evaporator inspired by blackbody radiation is developed using human hair waste. The vertically aligned hair structure enables broadband light absorption, efficient thermal localization, and rapid water transport, achieving high evaporation rates and stable desalination performance.
Yi Liu, Xuhui Sun, Jiaxian Zheng, Xiangfeng Lin, Jianqiushi Ma, Swellam Wafa Abdellatif Ali Sharshir, Liwei Wang, Meng An, Jie Wang, Yusuke Yamauchi, Zhanhui Yuan   +10 more
wiley   +1 more source

Research on the Requirement Validation Process of an eVTOL Aircraft

Engineering Proceedings
According to the SAEARP4754B standard, the positive development of electric vertical takeoff and landing (eVTOL) aircraft must carry out requirement management in order to ensure the traceability of requirements.
Haiyun Yang, Yiheng Li, Jing Hu
doaj   +1 more source

Dynamical Properties of the Mukhanov-Sasaki Hamiltonian in the Context of Adiabatic Vacua and the Lewis-Riesenfeld Invariant

Universe, 2019
We use the method of the Lewis-Riesenfeld invariant to analyze the dynamical properties of the Mukhanov-Sasaki Hamiltonian and, following this approach, investigate whether we can obtain possible candidates for initial states in the context of inflation ...
Max Joseph Fahn, Kristina Giesel, Michael Kobler   +2 more
doaj   +1 more source

The generalized second law of thermodynamics in generalized gravity theories

, 2008
We investigate the generalized second law of thermodynamics (GSL) in generalized theories of gravity. We examine the total entropy evolution with time including the horizon entropy, the non-equilibrium entropy production, and the entropy of all matter ...
Bin Wang, Buchmüller W Jaeckel J, Cai R G, Cognola G, Davies P C W, Elicalde E Silva P J, Eling C, Faraoni V, Frolov A V, Guo-Hong Yang, Hayward S A, Padmanabhan T, Peng-Ming Zhang, Pollock M D, Setare M R, Shao-Feng Wu, Wu S F Wang B Yang G H, Wu S F Yang G H Zhang P M, Zhou J   +18 more
core   +1 more source

Boosting the Energy Density of “Anode‐Free” Lithium Metal Batteries via Electrospun Polymeric Scaffolds

Advanced Functional Materials, EarlyView.
While host structures are known to enhance the reversibility and safety of lithium metal deposition, their additional volume and weight often decrease the battery's energy density and specific energy. By combining a lightweight and porous scaffold of electrospun polymer with a thinner separator, this article demonstrates a simultaneous improvement of ...
Lennart Wichmann, Bärbel Tengen, Peng Yan, Peter Lennartz, Isidora Cekic‐Laskovic, Martin Winter, Gunther Brunklaus   +6 more
wiley   +1 more source

AdS backgrounds and induced gravity

, 2019
In this paper we look for AdS solutions to generalised gravity theories in the bulk in various spacetime dimensions. The bulk gravity action includes the action of a non-minimally coupled scalar field with gravity, and a higher-derivative action of ...
Lin, Hai, Narain, Gaurav
core  

Eikonal phase matrix, deflection angle, and time delay in effective field theories of gravity [PDF]

, 2020
Manuel Accettulli Huber, Andreas Brandhuber, Stefano De Angelis, Gabriele Travaglini   +3 more
openalex   +1 more source

Nature‐Inspired Sustainable Cooling for Photovoltaics with Enhanced Temperature‐Salinity Dynamics

Advanced Functional Materials, EarlyView.
Addressing solar panel overheating, a nature‐inspired cooling system mimicking ocean currents is developed. A moisture‐absorbing solution layer uses sunlight, radiative cooling, and moisture processes to create temperature/salinity gradients, accelerating circulation. The prototype cools panels by up to 18.2 °C under sunlight, sustains cooling, rapidly
Fuxiang Li, Zengguang Sui, Haosheng Lin, Yunren Sui, Francesco Vanin, Chunlei Zhang, Zonglong Zhu, Wei Wu   +7 more
wiley   +1 more source