Ultraviolet Download
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The WOUDC data archive can be searched by data category: there are six ozone data categories and three ultraviolet (UV) radiation data categories. The ozone datasets for total column ozone include total ozone and total ozone observations and the vertical ozone profile includes lidar, ozonesonde, Umkehr N-value and C-Umkehr. The UV datasets for UV irradiance include broadband, multiband and spectral.
To search and download data, select the dataset and observation time period. Optionally, draw your map extent of interest and then hit search. All available data for that time period will be displayed.
Late in his life, Claude Monet developed cataracts. As his lenses degraded, they blocked parts of the visible spectrum, and the colors he perceived grew muddy. Monet's cataracts left him struggling to paint; he complained to friends that he felt as if he saw everything in a fog. After years of failed treatments, he agreed at age 82 to have the lens of his left eye completely removed. Light could now stream through the opening unimpeded. Monet could now see familiar colors again. And he could also see colors he had never seen before. Monet began to see--and to paint--in ultraviolet.
We can turn light into vision thanks to the pigments in our eyes, which snatch photons and trigger electric signals that travel to our brains. We have three types of pigments tuned to violet, green, and red light. Birds, bees, and many other animals have additional pigments tuned to ultraviolet light. Ultraviolet vision has led to the evolution of ultraviolet color patterns. In some butterfly species, for example, the males and females look identical to the ordinary human eye. In UV light, however, the males sport bright patterns on their wings to attract the females. Many flowers have ultraviolet colors, often using them to get the attention of pollinating bees.
While each kind of pigment responds most strongly to a particular color, it can also respond more weakly to neighboring parts of the spectrum. The violet-tuned pigment, for example,can respond wealy to ultraviolet light, which has a higher frequency. Most of us don't get to experience that response, because our lenses filter out UV rays.
This paper discusses two technical photographic methods based on the use of ultraviolet sources for art examination: Ultraviolet fluorescence (UVF) and Ultraviolet Reflected (UVR). While the first imaging can be realized with any digital camera, UVR images are acquired with digital cameras modified to be full spectrum since their sensitivity is extended into the ultraviolet region until about 360 nm. This modification consists in the removal of the in-built hot mirror filter on the CCD or CMOS sensor, which in turn renders it sensitive to ultraviolet and infrared light. This paper illustrates the procedures and the equipment to perform these methods discussing case studies and prepared samples.
Methods: Strips of tissue inoculated with a known concentration of either Staphylococcus aureus, Enterococcus faecalis, or Acinetobacter sp were placed on 22 high-touch surfaces of an AW. Half of the AW surfaces received direct ultraviolet (UV) light exposure and half received indirect exposure. Two inoculated strips, in sterile tubes outside of the room, represented the control. Trials were conducted on AWs in an operating room and a small room. Strips were placed in a saline solution, vortexed, and plated on blood agar to assess BR by the number of colony forming units.
Free Ultraviolet PowerPoint Template is an exclusive PowerPoint template design featuring an ultraviolet background. The ultraviolet template for PowerPoint (and also compatible with Google Slides) is a great background design that you can use as an abstract PowerPoint theme for a variety of presentation purposes and topics. This ultraviolet background design for PowerPoint can be used to prepare professional business or marketing presentations but also for educational topics. It was developed by a group of highly qualified graphic designers to help you create a presentation that is clear, bold, and visually impactful.
The Ultraviolet presentation template with ultraviolet styles can be used to prepare awesome presentations for a variety of business purposes and educational topics. The template can also be combined with other great backgrounds for PowerPoint to produce impactful designs. Get inspiration from ready-made PPT templates like the ultraviolet template to prepare high-impact presentations and Wow your audience.
Abstract:Coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has emerged as a serious threat to human health worldwide. The inactivation of SARS-CoV-2 on object surfaces and in the indoor air might help to halt the COVID-19 pandemic. Far-ultraviolet light (UVC) disinfection has been proven to be highly effective against viruses and bacteria. To understand the wavelength and duration of UVC radiation required for SARS-CoV-2 inactivation, we examined the efficacy of UVC light prototype devices with the wavelengths of 275, 254, and 222 nm. The disinfection effectiveness was determined by cell-based assays including the median tissue culture infectious dose (TCID50) and an immunofluorescent assay on African green monkey kidney epithelial Vero E6 cells. Among the three prototypes, the UVC LED (275 nm) had the best virucidal activity with a log-reduction value (LRV) >6 after 10 s of exposure. The mercury lamp (254 nm) reached similar virucidal activity after 20 s of exposure. However, the excimer lamp (222 nm) showed limited anti-SARS-CoV-2 activity with a LRV < 2 after 40 s of exposure. Overall, in comparison, the UVC LED (275 nm) exhibited superior SARS-CoV-2 disinfection activity than the mercury lamp (254 nm) and the excimer lamp (222 nm).Keywords: SARS-CoV-2; UVC light; disinfection; environmental contamination
The ultraviolet (UV) photoconductance properties of a single hexagonal WO3 nanowire have been studied systematically. The conductance of WO3 nanowires is very sensitive to ultraviolet B light and a field-effect transistor (FET) nanodevice incorporating a single WO3 nanowire exhibits excellent sensitivity, reversibility, and wavelength selectivity. A high photoconductivity gain suggests that WO3 nanowires can be used as the sensing element for UV photodetectors. Measurements under UV light in vacuum show that the adsorption and desorption of oxygen molecules on the surface of the WO3 nanowire can significantly influence its photoelectrical properties. The WO3 nanowires have potential applications in biological sensors, optoelectronic devices, optical memory, and other areas.
The IES Photobiology Committee prepared this Committee Report in response to the COVID-19 pandemic, to explain germicidal ultraviolet (GUV) disinfection. The report provides answers to frequently asked questions on GUV and its abilities, with some limitations, to safely reduce the transmission of SARS-CoV-2, the virus that causes COVID-19. The report is focused on the potential uses of GUV in healthcare facilities. It distinguishes GUV air and surface disinfection usages, and it emphasizes the need for GUV to be applied correctly and monitored for output and safety, and that training on the operation and maintenance of the systems over time is also important. The document also provides safety precautions regarding residential use.
Amidst the current uncertainty of the global pandemic, the Illuminating Engineering Society (IES) has facilitated a special FREE educational program on germicidal ultraviolet (GUV), photobiological basics, carcinogenicity risk, UV-C lamp sources, relevant research, and more.
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