Results 91 to 100 of about 6,397,764 (332)

Testing f (R) theories using the first time derivative of the orbital period of the binary pulsars [PDF]

, 2013
In this paper we use one of the Post-Keplerian parameters to obtain constraints on f(R)-theories of gravity. Using Minkowskian limit, we compute the prediction of f(R)theories on the first time derivative of the orbital period of a sample of binary stars,
M. Laurentis, I. Martino
semanticscholar   +1 more source

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

Long-term periodicity in LSI+61303 as beat frequency between orbital and precessional rate

, 2013
Context: In the binary system LSI+61303 the peak flux density of the radio outburst, which is related to the orbital period of 26.4960 +/- 0.0028d, exibits a modulation of 1667 +/- 8 d.
Jaron, F., Massi, M.
core   +1 more source

Enhancing CoFe Catalysts with V2CTX MXene‐Derived Materials for Anion Exchange Membrane Electrolyzers

Advanced Functional Materials, EarlyView.
MXene dervied CoFe composites show increased initial Oxygen Evolution Reaction (OER) activity compared to the pure CoFe and MXene in an Anion Exchange Membrane device. Vanadium vacancies in the MXene plays a role in increased OER activity and hinders Fe leaching in the AEM device over using the pure V2C MXene as a support material for the CoFe ...
Can Kaplan, Karuppasamy Dharmaraj, Thorsten Schultz, Leiqiang Qin, Ningjun Chen, Danielle A. Douglas‐Henry, Bastian Schmiedecke, Merve Buldu‐Akturk, Axel Zuber, Iris Dorbandt, Maximilian Reinhardt, Yael Rodriguez‐Ayllon, Yan Lu, Valeria Nicolosi, Norbert Koch, Johanna Rosen, Michelle P. Browne   +16 more
wiley   +1 more source

The lower bound on the orbital period of Kerr–Newman black holes

European Physical Journal C: Particles and Fields
Based on studies of orbital periods in Kerr black hole spacetimes, Hod conjectured the existence of a universal lower bound on the orbital period for compact objects.
Yan Peng
doaj   +1 more source

The Keck Planet Search: Detectability and the Minimum Mass and Orbital Period Distribution of Extrasolar Planets [PDF]

, 2008
We analyze 8 years of precise radial velocity measurements from the Keck Planet Search, characterizing the detection threshold, selection effects, and completeness of the survey.
A. Cumming, R., Paul Butler, Geoffrey, W., Marcy, Steven, S., Vogt, Jason, T., Wright, Debra, A., Fischer   +14 more
semanticscholar   +1 more source

A Robust Measure of Tidal Circularization in Coeval Binary Populations: The solar-type spectroscopic Binary Population in The Open Cluster M35

, 2004
We present a new homogeneous sample of 32 spectroscopic binary orbits in the young (~ 150 Myr) main-sequence open cluster M35. The distribution of orbital eccentricity vs.
Claret A., Darwin G. H., Duquennoy A., Giuricin G., Griffin R. F., Hut P., Mermilliod J. C., Mermilliod J.-C., Mermilliod J.-C., Mermilliod J.-C., Pan K., Rieutord M., Robert D. Mathieu, Savonije G. J., Soren Meibom, Tassoul J.-L., Witte M. G., Witte M. G., Zahn J.-P., Zahn J.-P., Zahn J.-P., Zahn J.-P., Zahn J.-P., Zahn J.-P.   +23 more
core   +2 more sources

Enhancing Direct Solar Water Splitting via ALD of Multifunctional TiO2/Pt Nanoparticle Coatings With Engineered Interfaces to GaAs/GaInP Tandem Cells

Advanced Functional Materials, EarlyView.
Multifunctional atomic layer deposited coatings and interface treatments enhance direct solar water splitting on GaAs/GaInP tandem cells. Optimized TiO2/Pt nanoparticle bilayers ensure durability and catalytic efficiency with minimal optical losses, while H2 plasma pretreatments maximize photovoltage and interfacial charge extraction.
Tim F. Rieth, Verena Streibel, Oliver Bienek, Sergej Levashov, Johannes Dittloff, Kristof Möller, Johanna Eichhorn, Matthias M. May, Ian D. Sharp   +8 more
wiley   +1 more source

The extreme orbital period in scalar hairy kerr black holes

Physics Letters B, 2019
In a very interesting paper, Hod has proven that the equatorial null circular geodesic provides the extreme orbital period to circle a kerr black hole, which is closely related to the Fermat's principle.
Yan Peng
doaj   +1 more source

Primary Orbital Lymphoma – A Challenging Diagnosis

Acta Medica Bulgarica, 2020
Background and purpose: The occurrence of primary orbital lymphoma comprises approximately 1% of non-Hodgkin’s lymphoma and 8% of extranodal lymphoma. The vast majority of orbital lymphomas are of B-cell origin, of which extranodal marginal zone B-cell ...
Vylkanov St., Trifonova K., Slaveykov K., Dzhelebov D.   +3 more
doaj   +1 more source