Results 71 to 80 of about 108,040 (211)

A Susy Phase Transition as Central Engine [PDF]

, 2005
For several decades the energy source powering supernovae and gamma ray bursts has been a troubling mystery. Many articles on these phenomena have been content to model the consequences of an unknown "central engine" depositing a large amount of energy ...
Clavelli, L.
core  

A Fundamental Test of the Nature of Dark Matter [PDF]

, 1999
Dark matter may consist of weakly interacting elementary particles or of macroscopic compact objects. We show that the statistics of the gravitational lensing of high redshift supernovae strongly discriminate between these two classes of dark matter ...
Joseph Silk, Patat F., R. Benton Metcalf
core   +2 more sources

N‐Geranylated Amino Acid Surfactants with Low Critical Micelle Concentrations from Abundant, Naturally Derived Starting Materials

ChemistryOpen, EarlyView.
Cleaning Up Surfactants: Realising critical micelle concentrations lower than sodium dodecyl sulfate with sustainable surfactants prepared from amino acids and naturally occurring aldehydes. In this work, a simple method for the preparation of N‐alkylated amino acid surfactants in 1–2 steps is reported.
Brett L. Pollard, Yumeng Liu, Michael G. Gardiner, Luke A. Connal   +3 more
wiley   +1 more source

The Early Evolution of Primordial Pair-Instability Supernovae

, 2010
The observational signatures of the first cosmic explosions and their chemical imprint on second-generation stars both crucially depend on how heavy elements mix within the star at the earliest stages of the blast. We present numerical simulations of the
Abel, Abel, Almgren, Alvarez, Bromm, Bromm, Bromm, C. C. Joggerst, Daniel J. Whalen, Fryer, Greif, Greif, Hammer, Heger, Joggerst, Joggerst, Joggerst, Karlsson, Kitayama, Kitayama, Mackey, Nakamura, O'Shea, Scannapieco, Smith, Whalen, Whalen, Whalen, Wise, Wise   +29 more
core   +1 more source

Nachtsicht ins All mit dem bloßen Auge: Sag mir, wie weit die Sterne steh'n

Physik in unserer Zeit, EarlyView.
Beim Blick in den Nachthimmel sehen wir ohne optische Hilfsmittel und abhängig von der lokalen Lichtverschmutzung viele Hundert bis maximal einige Tausend Sterne und auch einige Galaxien. Aber wie weit sind diese von uns entfernt? Und bis zu welchen maximalen Entfernungen können wir Objekte im Weltall mit dem bloßen Auge wahrnehmen?
Michael Vollmer
wiley   +1 more source

Determining Evolution of Cosmological Constant, Gravitational Constant and Speed of Light Using Nonadiabatic Cosmological Model and LLR Findings

Galaxies, 2019
We have shown that the Hubble constant H 0 embodies the information about the evolutionary nature of the cosmological constant Λ , gravitational constant G , and the speed of light c .
Rajendra P. Gupta
doaj   +1 more source

Synthesis, Characterization, and Energetic Performance of a New Copper Complex Based on 3,4,5‐Trinitro‐1H‐pyrazole

Propellants, Explosives, Pyrotechnics, EarlyView.
A new copper compound based on the trinitropyrazolate (TNP−) ligand ammonium copper(II) (tetrakis)trinitropyrazolate [(NH4+)2CuII(TNP−)4] has been prepared and structurally characterized, which displays different thermo‐chemical behaviour and sensitivity properties from the parent compound ammonium 3,4,5‐trinitropyrazolate. ABSTRACT The urgent need for
Ashfaq Afsar, Xiaojiao Liu, Patrick McMaster, Carole A. Morrison, Colin R. Pulham   +4 more
wiley   +1 more source

Axion-like Particles from Nearby Type Ia Supernovae [PDF]

, 2022
Kanji Mori
openalex   +1 more source

Formation of Uranium Pinacolate from the Reductive Coupling of Acetone

Zeitschrift für anorganische und allgemeine Chemie, EarlyView.
Uranium(III) cyclopentadienyl complexes are shown to react with acetone in a pinacol coupling, forming uranium pinacolate complexes. Single crystals obtained from the reaction are the first direct structural proof of the previously proposed metallapinacolate intermediate. 1,2‐Diols are elemental building blocks in organic synthesis.
León Hillers, Lisa Vondung
wiley   +1 more source

DMSO solvates of tert‐butylcalix[6]arene and related multisolvent structures

Acta Crystallographica Section B, EarlyView.
This study highlights how solvent properties, host–guest interaction energies and packing preferences govern the solid‐state organization of tert‐butylcalix[6]arene, a macrocycle of importance in separation, molecular recognition and supramolecular chemistry.tert‐Butylcalix[6]arene (TBC6) exhibits a rich crystal energy landscape, with structural ...
Monika Wanat, Ewelina Zaorska, Maura Malinska   +2 more
wiley   +1 more source