Results 91 to 100 of about 40,502 (295)

Gravitation

open access: yes, 1933
Das vorliegende Heft ist ein Sonderabdruck aus der 2. Auflage des Handwörterbuches der Naturwissenschaften ‚ das im Verlag von Gustav Fischer in Jena erscheint, und gibt eine gemeinverständliche Einführung in die Gravitation der Erde.researchDFG, SUB ...
Meisser, Otto
core   +1 more source

Finite-Range Scalar–Tensor Gravity: Constraints from Cosmology and Galaxy Dynamics

open access: yesGalaxies
Objective: We examine whether a finite-range scalar–tensor modification of gravity can be simultaneously compatible with cosmological background data, galaxy rotation curves, and local/astrophysical consistency tests, while satisfying the luminal ...
Elie Almurr, Jean Claude Assaf
doaj   +1 more source

Microscale Patterning of Ultrahigh‐Viscosity Metallic‐Polymer Composites via Embedded Droplet Writing

open access: yesAdvanced Functional Materials, EarlyView.
A hybrid additive manufacturing platform integrates direct droplet writing of metallic composite with VAT photopolymerization to fabricate architected soft magnetic composites. This approach enables microscale patterning of high‐viscosity materials for programmable actuators, adaptive fluidic devices, and switchable adhesives, offering tunable ...
Yeowon Yoon   +4 more
wiley   +1 more source

Transborder Economic Gravitation

open access: yes, 2022
The aim of the paper is to present theoretical foundations of the analysis of processes of polarization of transborder regional development, explaining causes of these processes, forecasting of these processes, identification of medium and long-term ...
Oleński, Józef
core   +1 more source

The Conservative Field of Coupled Newton–Coulomb Sources: Component Coupling Constants, Mass ⇌ Charge Cross-Forces, and Radiation from Reissner–Nordström Black Hole Mergers

open access: yesAxioms
We investigate a combined conservative field, in which classical gravitational and electrostatic sources also exhibit mutual interactions. Hitherto neglected, the coupling between mass and charge may be necessary for constructing a unified conservative ...
Dimitris M. Christodoulou   +2 more
doaj   +1 more source

On Gravitational Repulsion [PDF]

open access: yesGeneral Relativity and Gravitation, 1997
10 pages, lates with 2 figures. Third prize in 1997 Gravity essay competition.
openaire   +2 more sources

CO2‐to‐CO Conversion in a Gas‐Fed, Zero‐Gap, PEM Electrolyzer Enabled by Polycations and Nitrogen‐Doped Carbon‐Supported Cobalt Nanoparticles

open access: yesAdvanced Functional Materials, EarlyView.
A gas‐fed, zero‐gap, PEM CO2 electrolyzer is realized by incorporating PDDA+ ions onto the carbonaceous Co/N‐C electrocatalyst, with gaseous H2 and CO2 fed into the anode and cathode, respectively. Operating without an aqueous electrolyte, the system sustains a peak FECO of 65.1% at 100 mA cm−2. ABSTRACT Electrochemical carbon dioxide reduction (ECO2R)
Yuen Leong Chow   +6 more
wiley   +1 more source

Quantum Gravity: A Primer for Philosophers. [PDF]

open access: yes, 2008
‘Quantum Gravity’ does not denote any existing theory: the field of quantum gravity is very much a ‘work in progress’. As you will see in this chapter, there are multiple lines of attack each with the same core goal: to find a theory that unifies, in ...
Rickles, Dean
core  

Probing jet base emission of M87* with the 2021 Event Horizon Telescope observations

open access: yesAstronomy & Astrophysics
We investigate the presence and spatial characteristics of the jet base emission in M87* at 230 GHz, enabled by the significantly enhanced (u,v) coverage in the 2021 Event Horizon Telescope (EHT) observations.
Saurabh   +284 more
doaj   +1 more source

Embedded Direct Ink Writing of Thermoset and Elastomeric Polymers via Frontal Polymerization

open access: yesAdvanced Functional Materials, EarlyView.
Embedded frontal polymerization direct ink writing (FP‐DIW) combines frontal ring‐opening metathesis polymerization with embedded 3D printing to decouple deposition from curing. A yield‐stress support bath stabilizes low‐viscosity inks, while on‐demand thermal initiation enables controlled front propagation. This approach expands the accessible feature
Mohammad Tanver Hossain   +12 more
wiley   +1 more source

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