Results 31 to 40 of about 6,087,560 (207)
Spontaneous emission of color centers at 4eV in hexagonal boron nitride under hydrostatic pressure [PDF]
Superlattices and Microstructures (2019), 2019 The light emission properties of color centers emitting in 3.3-4 eV region are investigated for hydrostatic pressures ranging up to 5GPa at liquid helium temperature. The light emission energy decreases with pressure less sensitively than the bandgap. This behavior at variance from the shift of the bandgap is typical of deep traps.
arxiv +1 more source
In situ high-pressure spectroscopic studies using moissanite (4H-SiC) anvils
AIP Advances, 2018 We examined the Raman scattering and IR absorption spectroscopy of 4H-SiC and its performance as an anvil material for high-pressure UV-visible absorption spectroscopic measurements.
Jinbo Zhang +7 more
doaj +1 more source
Quantitative Estimates of Environmental Effects on the Star Formation Rate of Disk Galaxies in Clusters of Galaxies [PDF]
, 1998 A simple model is constructed to evaluate the change of star formation rate of a disk galaxy due to environmental effects in clusters of galaxies. Three effects, (1) tidal force from the potential well of the cluster, (2) increase of external pressure ...
Evrard A. E. +6 more
core +2 more sources
Complete pressure dependent phase diagrams for SrFe2As2 and BaFe2As2 [PDF]
PRB 79, 224518 (2009), 2009 The temperature dependent electrical resistivity of single crystalline SrFe2As2 and BaFe2As2 has been measured in a liquid medium, modified Bridgman anvil cell for pressures in excess of 75 kbar. These data allow for the determination of the pressure dependence of the higher temperature, structural / antiferromagnetic phase transitions as well as the ...
arxiv +1 more source
Nanomaterials, 2022 The reinforcements represented by graphene nanoplatelets, graphite, and carbon nanotubes have demonstrated the great potential of carbon materials as reinforcements to enhance the mechanical properties of TiO2.
Bing Liu +11 more
doaj +1 more source
Synthesis of quenchable amorphous diamond
Nature Communications, 2017 Diamond’s properties are dictated by its crystalline, fully tetrahedrally bonded structure. Here authors synthesize a bulk sp 3-bonded amorphous form of carbon under high pressure and temperature, show that it has bulk modulus comparable to crystalline ...
Zhidan Zeng +10 more
doaj +1 more source
Grain-boundary-rich polycrystalline monolayer WS2 film for attomolar-level Hg2+ sensors
Nature Communications, 2021 Here, the authors report the controlled growth of polycrystalline WS2 films with high density of grain boundaries to realize surface plasmon Hg2+ ion sensors exhibiting attomolar sensitivity and enhanced selectivity.
Lixuan Liu +15 more
doaj +1 more source
A new room-temperature equation of state of Bi up to 260 GPa [PDF]
, 2023 At room temperature, bismuth undergoes several structural transitions with increasing pressure before taking on a body-centered cubic (bcc) phase at approximately 8 GPa. The bcc structure is stable to the highest measured pressure and its simplicity, along with its high compressibility and atomic number, make it an enticing choice as a pressure ...
arxiv +1 more source
Stars creating a gravitational repulsion
, 2018 In the framework of the Theory of General Relativity, models of stars with an unusual equation of state $\rho c^20$ where $\rho$ is the mass density and $P$ is the pressure, are constructed.
Bisnovatyi-Kogan, G. S. +2 more
core +1 more source
Effects of Ram-Pressure from Intracluster Medium on the Star Formation Rate of Disk Galaxies in Clusters of Galaxies [PDF]
, 1998 Using a simple model of molecular cloud evolution, we have quantitatively estimated the change of star formation rate (SFR) of a disk galaxy falling radially into the potential well of a cluster of galaxies.
Kodama T. +4 more
core +3 more sources