Results 31 to 40 of about 6,005,612 (360)

Analysis of Cadmium Contamination in Lettuce (Lactuca sativa L.) Using Visible-Near Infrared Reflectance Spectroscopy

Sensors, 2023
In order to rapidly and accurately monitor cadmium contamination in lettuce and understand the growth conditions of lettuce under cadmium pollution, lettuce is used as the test material.
Lina Zhou, Leijinyu Zhou, Hongbo Wu, Lijuan Kong, Jinsheng Li, Jianlei Qiao, Limei Chen   +6 more
doaj   +1 more source

Color Point Tuning for (Sr,Ca,Ba) Si2O2N2:Eu2+ for White Light LEDs [PDF]

, 2009
Color point tuning is an important challenge for improving white light LEDs. In this paper, the possibilities of color tuning with the efficient LED phosphor Sr1−x−y−zCaxBaySi2O2N2:Euz2+ (0 ≤ x, y ≤ 1; 0.005 ≤ z ≤ 0.16) are investigated.
Bachmann, Volker, Meijerink, Andries, Oeckler, Oliver, Ronda, Cees, Schnick, Wolfgang   +4 more
core   +1 more source

Spectral Shifts of Nonadiabatic High-Order Harmonic Generation

Applied Sciences, 2013
High-order harmonic generation (HHG) is a nonlinear nonperturbative process in ultrashort intense laser-matter interaction. It is the main source of coherent attosecond (1 as = 10−18 s) laser pulses to investigate ultrafast electron dynamics.
André D. Bandrauk, Xue-Bin Bian
doaj   +1 more source

Color Changes in Ag Nanoparticle Aggregates Placed in Various Environments: Their Application to Air Monitoring

Nanomaterials, 2021
Fresh Ag nanoparticles (NPs) dispersed on a transparent SiO2 exhibit an intense optical extinction band originating in localized surface plasmon resonance (LSPR) in the visible range.
Koichi Ozaki, Fumitaka Nishiyama, Katsumi Takahiro   +2 more
doaj   +1 more source

More complete discussion of the time-dependence of the non-static line element for the universe [PDF]

, 1930
In a previous article,(1) I have shown that a continuous transformation of matter into radiation, occurring throughout the universe, as postulated by the astrophysicists, would necessitate a nonstatic line element for the universe, and have shown that ...
Tolman, Richard C.
core   +1 more source

Cosmological Red-shift [PDF]

Nature, 1964
Hoyle1 has shown that for a steady-state universe consisting of uniformly distributed matter of density ρ a metric of the form: applies if it is assumed that a uniform creation of matter occurs.
openaire   +2 more sources

Cosmic Concordance and Quintessence [PDF]

, 2000
We present a comprehensive study of the observational constraints on spatially flat cosmological models containing a mixture of matter and quintessence --- a time varying, spatially inhomogeneous component of the energy density of the universe with ...
Affleck I., Barreiro T., Bartelmann M., Bertschinger E., Binetruy P., Blanton M., Bloomfield-Torres L. F., Bond J. R., Burles S., Burles S., Burles S., Croft R. A. C., Davis M., Evrard A. E., Fry J. N., Fukugita M., Hill C., Hill C., Hu W., Huey G., J. P. Ostriker, Leitch E. M., Limin Wang, Linde A., Malhotra S., McDonald P., Myers S. T., Oliveira-Costa A., Paul J. Steinhardt, Peacock J., R. R. Caldwell, Ratra B., Salaris M., Spergel D., Steinhardt P. J., Waga I., Weinberg D. H., Weiss N., Wetterich C.   +38 more
core   +2 more sources

Screening High-z GRBs with BAT Prompt Emission Properties [PDF]

, 2008
Detecting high-z GRBs is important for constraining the GRB formation rate, and tracing the history of re-ionization and metallicity of the universe.
David Palmer, Ed Fenimore, K. S. Dhuga, M. Galassi, M. Stamatikos, N. Gehrels, T. N. Ukwatta, T. Sakamoto   +7 more
core   +2 more sources

Explaining the Gamma-Ray Burst E_peak Distribution [PDF]

, 2002
The characteristic photon energy for Gamma Ray Bursts, E_peak, has a remarkably narrow distribution for bursts of similar peak flux, with values between 150 and 600 keV for most faint bursts.
Schaefer, Bradley E.
core   +3 more sources

Electronic excited state of protonated aromatic molecules: protonated Fluorene [PDF]

, 2011
The photo-fragmentation spectrum of protonated fluorene has been recorded in the visible spectral region, largely red shifted as compared to the first excited state absorption of neutral fluorene. The spectrum shows two different vibrational progressions,
Ahlrichs, Alata, Antol, Chakraborty, Christophe Jouvet, Claude Dedonder, Dallinga, Dopfer, Dopfer, Du, Dunning, Ernesto Marceca, Freiser, Freiser, Freiser, Garkusha, Gold, Hammonds, Hobbs, Hunter, Im, Ivan Alata, Kappaun, Knorke, Le Page, Leutwyler, Lorenz, Maksic, Michel Broquier, Olah, Olah, Pathak, Perkampus, Reid, Ricks, Rode, Schreiber, Snow, Solcà, Solcà, Weigend, Zhang, Zhao   +42 more
core   +5 more sources