Results 21 to 30 of about 628,380 (224)

Compact Plasma-Based Soft X-Ray Lasers

open access: yesIEEE Photonics Journal, 2010
This paper reviews the major accomplishments in the demonstration of plasmabased soft x-ray lasers in 2009. Advances in shaping the plasma density and increasing the pump power have enabled the engineering of table-top laser systems operating at ...
Jorge J. Rocca
doaj   +1 more source

Robust Evaluation of Ultraviolet-C Sensitivity for SARS-CoV-2 and Surrogate Coronaviruses

open access: yesMicrobiology Spectrum, 2021
UV light, more specifically UV-C light at a wavelength of 254 nm, is often used to disinfect surfaces, air, and liquids. In early 2020, at the cusp of the COVID-19 pandemic, UV light was identified as an efficient means of eliminating coronaviruses ...
S. J. Boegel   +9 more
doaj   +1 more source

Intensities of incident and transmitted ultraviolet-a rays through gafchromic films

open access: yesJournal of Medical Physics, 2017
Gafchromic films have been applied to X-ray dosimetry in diagnostic radiology. To correct nonuniformity errors in Gafchromic films, X-rays in the double-exposure technique can be replaced with ultraviolet (UV)-A rays.
Toshizo Katsuda   +7 more
doaj   +1 more source

Cannabis Inflorescence Yield and Cannabinoid Concentration Are Not Increased With Exposure to Short-Wavelength Ultraviolet-B Radiation

open access: yesFrontiers in Plant Science, 2021
Before ultraviolet (UV) radiation can be used as a horticultural management tool in commercial Cannabis sativa (cannabis) production, the effects of UV on cannabis should be vetted scientifically.
Victoria Rodriguez-Morrison   +2 more
doaj   +1 more source

Ultraviolet properties of f(R)-Gravity [PDF]

open access: yesInt.J.Mod.Phys.A23:143-150,2008, 2007
We discuss the existence and properties of a nontrivial fixed point in f(R)-gravity, where f is a polynomial of order up to six. Within this seven-parameter class of theories, the fixed point has three ultraviolet-attractive and four ultraviolet-repulsive directions; this brings further support to the hypothesis that gravity is nonperturbatively ...
arxiv   +1 more source

Chlorogenic acid in preventing and curing ultraviolet-induced damage in human skin fibroblast as an antiaging cell model [PDF]

open access: yesPharmaciana, 2023
Continuous ultraviolet (UV) irradiation stimulates the over-production of reactive oxygen species (ROS) to cause degenerative diseases. Chlorogenic acid (CA) is found as plants antioxidant that promises medicinal effects.
Ermi Girsang   +6 more
doaj   +1 more source

Spectral Observation of Solar Photosynthetically Active Radiation on Clear Days in Qinghai-Xizang Plateau

open access: yesGaoyuan qixiang
Photosynthetically Active Radiation (PAR) spectrum, in visible light, is the wavelength range sensitive to plants and can be absorbed by them for photosynthesis.The characteristics of ground PAR spectrum directly affect the growth, development ...
Min SHENG   +6 more
doaj   +1 more source

Large-order Behaviour due to Ultraviolet Renormalons in QCD [PDF]

open access: yesPhys.Lett. B404 (1997) 315-320, 1997
Ultraviolet renormalons, contrary to their infrared counterparts, lead to a universal contribution to the large-order behaviour of perturbative expansions in QCD. In this letter, we determine nature of the leading ultraviolet renormalon singularity for the inclusive hadroproduction cross section in $e^+ e^-$ annihilation, for hadronic $\tau$ decays and
arxiv   +1 more source

Spectral Behaviour and Flaring Activity of II Peg in the Ultraviolet [PDF]

open access: yes, 2022
We have investigated the spectral behaviour of II Peg binary system in the ultraviolet band by using International Ultraviolet Explorer observations over fifteen years. The ultraviolet observations show indication of flare activity in the chromosphere and transition region with their enhanced spectral lines.
arxiv   +1 more source

Synthesis of Benzoyl C-Phenylcalix[4]resorcinaryl Octaacetate and Cinnamoyl C-Phenylcalix[4]arene for UV Absorbers

open access: yesIndonesian Journal of Chemistry, 2014
A new upper rim-functionalized benzoyl C-phenylcalix[4]resorcinaryl octaacetate and cinnamoyl C-phenylcalix[4]resorcinarene have been synthesized and evaluated as the absorbers for ultraviolet radiation.
Budiana I Gusti M. Ngurah   +4 more
doaj   +1 more source

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