Topic
Ultraviolet light
About: Ultraviolet light is a research topic. Over the lifetime, 49494 publications have been published within this topic receiving 843151 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, an attempt is made to synthesize the cerium-doped copper ferrite nanoparticles (CuFe2−xCexO4) through an auto-combustion method with the aid of nitrate precursors such as copper(II), iron(III), and cerium(III) in an aqueous solution.
Abstract: In the current study and attempt is made to synthesized the cerium-doped copper ferrite nanoparticles (CuFe2−xCexO4) through an auto-combustion method with the aid of nitrate precursors such as copper(II), iron(III), and cerium(III (in an aqueous solution. Besides, the effect of different concentrations of various type of capping agents such as lactose and glucose on the morphology and particle size of final products was investigated. The structural, morphological, and optical properties of as-obtained products were characterized extensively by techniques such as FT-IR, XRD, EDX, SEM, TEM, and UV–vis. Furthermore, the magnetic property of as-prepared CuFe2−xCexO4 nanoparticles was also investigated with vibrating sample magnetometer at room temperature. Moreover, the as-prepared Ce-doped CuFe2O4 nanoparticles were used as efficient photocatalyst for the photocatalytic degradation of harmful organic dye, i.e. methyl orange under ultraviolet light.
162 citations
Book•
26 Apr 2002
TL;DR: In this paper, the authors present guidelines for the choice of lamp technology for UV-based disinfection units for drinking water treatment and provide a questionnaire for the selection of the best lamp technology.
Abstract: Introduction Historical: Use of UV Light in Drinking Water Treatment Present State of Standards and Regulations Definition of Ultraviolet Light: Range and Natural Sources Solar Radiant Energy Available Lamp (or Burner) Technologies General Mercury Emission Lamps Currently Available Commercial Lamp Technologies Available Lamp Technologies Special Lamp Technologies Preliminary Guidelines for Choice of Lamp Technology UV Emission Yields and Mode of Control Zonal Distribution of Emitted Light Use of Ultraviolet Light for Disinfection of Drinking Water Introduction Germicidal Action Dose-Efficiency Concept Representative Test Organisms Competitive Effects in Disinfection with UV-Light Multihit, Multisite, and Step-by-Step Killing Concepts Design Factors for Reactor Geometry Mixing Conditions in UV-Water Treatment Operational Control of Efficiency Tentative Design Questionnaire for UV-Based Disinfection Units for Drinking Water Examples Use of UV in Photochemical Synergistic Oxidation Processes in Water Sanitation Basic Principles Combinations of Hydrogen Peroxide and UV-Light Synergism of Ozone and UV in Water Sanitation UV-Catalytic Processes Tentative Design Rules for UV-Synergistic Oxidation Processes Use of UV Light for Sanitation of Wastewater Regulations and Guidelines for Disinfection of Treated Wastewater General Characteristics of Effluents in Relation to Disinfection by UV-Light Aftergrowth and Photorepair after Exposure to UV Disinfection of Wastewater Applied UV Doses in Wastewater Disinfection Choice of Lamp Technology in Wastewater Disinfection Toxicity and Formation of By-Products Preliminary Conclusions on Wastewater Disinfection with UV Example General Conclusions Glossary References Index
162 citations
TL;DR: In this paper, Mg-doped, (Al, Li)-doped and undoped ZnO thin films were deposited on glass substrates by a metal-organic decomposition method at temperatures around 600 °C.
Abstract: Visible photoluminescence (PL) from ZnO has been found to be tunable in a wide range from blue to green and orange through chemical doping and annealing. Mg-doped, (Al, Li)-doped, and undoped ZnO thin films were deposited on glass substrates by a metal-organic decomposition method at temperatures around 600 °C. The films were annealed under different atmospheres, including air, oxygen, nitrogen, and hydrogen/nitrogen. X-ray diffraction analysis and field-emission scanning electron microscope observations revealed that the films consisted of large ZnO grains 50−100 nm in size. When the Mg-doped ZnO films were annealed in nitrogen or hydrogen/nitrogen, unusual blue or bluish-white PL, respectively, was observed in response to an ultraviolet light excitation. We confirmed the band-gap broadening (approximately 0.25 eV) of the Mg-doped ZnO films as compared to that of the undoped films through observation of the absorption edge. The blue-related PL therefore appeared to be caused by energetic shifts of the va...
162 citations
TL;DR: The galvanized steel was found to be the most suitable for rainwater harvesting applications, with their resulting physical and chemical water quality parameters meeting the Korean guidelines for drinking water quality.
162 citations
TL;DR: The rise of atmospheric oxygen occurred long before the sudden appearance of multicellular eukaryotic organisms in the later Precambrian and occurred in a fully oxygenic atmosphere only after the evolution in protists of microtubule-utilising processes (mitosis and meiosis).
Abstract: It is argued that the transition to an oxidizing atmosphere preceded the origin of eukaryotic cells, which in turn must have preceded the origin of metazoa Moreover, the number of methods by which organisms can protect themselves from harmful UV radiation is sufficiently large to suggest that solar UV, even when the atmosphere was anaerobic, was not such as to control the distribution and diversification of life An alternative explanation for the late and sudden appearance of metazoa in lower Cambrian sediments is proposed, which is related to the mechanisms by which fully mature eukaryotic cells probably originated There was probably a protracted evolution of modern genetic systems based on mitosis in cells which acquired organelles (eg, plastids and mitochondria) by hereditary endosymbiosis The origin of hard parts underlies the Cambrian explosion of metazoans
162 citations