Bibliographies thématiques / UV-Visible light

Littérature scientifique sur le sujet « UV-Visible light »

Auteur : Grafiati
Publié le 22 juin 2024

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Articles de revues sur le sujet "UV-Visible light"

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Hersch, Roger D., Philipp Donzé et Sylvain Chosson. « Color images visible under UV light ». ACM Transactions on Graphics 26, no 3 (29 juillet 2007) : 75. http://dx.doi.org/10.1145/1276377.1276471.

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LYUBOVTSEVA, Yu S. « AEROSOL ABSORPTION OF UV AND VISIBLE LIGHT ». Journal of Aerosol Science 32 (septembre 2001) : 429–30. http://dx.doi.org/10.1016/s0021-8502(21)00197-x.

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Al-Sherbini, El-Sayed A. M. « UV–visible light reshaping of gold nanorods ». Materials Chemistry and Physics 121, no 1-2 (mai 2010) : 349–53. http://dx.doi.org/10.1016/j.matchemphys.2010.01.048.

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Wolf, Ursula, Sabine Klein, Annegret Sandig et Stephan Baumgartner. « Investigating homeopathic preparations with light spectroscopy ». International Journal of High Dilution Research - ISSN 1982-6206 11, no 40 (21 décembre 2021) : 117. http://dx.doi.org/10.51910/ijhdr.v11i40.584.

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Background Several series of experiments from our research group have shown ultraviolet (UV) light transmission of homeopathic preparations to slightly but significantly differ from controls. We now investigated whether visible and near infrared spectroscopy were also useful for exploring properties of homeopathic preparations. Materials and methods Homeopathic preparations of copper sulfate (CuSO4), hypericum and sulfur (S8) were produced in 30 sequential steps of 1:100 dilutions (c-preparations). As controls, succussed potentization medium was used. Transmission of the samples from 190-1100nm was measured 4 times on 5 days with a double beam Shimadzu UV PC 1601 spectrophotometer. To correct for the daily variations of the spectrophotometer, transmission of the samples at each nm was divided by the average transmission of the controls. Median transmissions of the samples were calculated for the ranges of 190-340nm (near and middle UV), 340-640nm (visible light without red), and 640-1100nm (red and near infrared). Differences in the median transmission between potency levels from 6c to 30c were determined using Kruskal-Wallis and Jonckheere-Terpstra tests. Results Differences in transmissions of the various potency levels were more pronounced in the UV range than in the visible or red/near infrared range. The Kruskal-Wallis test revealed significant differences for homeopathic preparations of CuSO4, hypericum and S8 in the UV range (p=0.032, 0.008, 0.009, respectively) and of S8 in the visible range (p=0.026). Jonckheere's test showed a tendency towards ascending medians with ascending potency levels for CuSO4 in the UV range (p=0.080). Significant trends were revealed for hypericum in the visible range (p=0.042, descending medians) and S8 in the UV range (p=0.015, ascending medians). Conclusion UV spectroscopy seemed to be more suitable for investigating homeopathic preparations than visible or near infrared spectroscopy, since differences in transmission were more pronounced in the UV range.
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Dunnill, Charles W. « UV Blocking Glass : Low Cost Filters for Visible Light Photocatalytic Assessment ». International Journal of Photoenergy 2014 (2014) : 1–5. http://dx.doi.org/10.1155/2014/407027.

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A number of commercially available art protection products have been compared and assessed for their suitability as UV blocking filters in the application of “visible light” photocatalytic research. Many groups claiming visible light photocatalytic success employ filters to block out stray UV radiation in order to justify that their photocatalysts are indeed visible light photocatalysts and not UV light photocatalysts. These filters come in varying degrees of ability and price and many authors fail to correctly characterise their filters in individual papers. The use of effective filters to prevent both false positive and false negative results is important to maintain scientific rigor and create accurate understanding of the subject. The optimum UV filter would have the highest UV blocking properties (<390 nm) and simultaneously the highest visible light transmission (390–750 nm). Single and double layers of each of the glass products were assessed as well as laminate products. The conclusions show an inexpensive and highly effective setup for the conduction of visible light photochemistry that should be incorporated as a standard part in any researcher’s work where the claim of visible light activity is made.
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Peccia, Jordan, et Mark Hernandez. « Photoreactivation in AirborneMycobacterium parafortuitum ». Applied and Environmental Microbiology 67, no 9 (1 septembre 2001) : 4225–32. http://dx.doi.org/10.1128/aem.67.9.4225-4232.2001.

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ABSTRACT Photoreactivation was observed in airborne Mycobacterium parafortuitum exposed concurrently to UV radiation (254 nm) and visible light. Photoreactivation rates of airborne cells increased with increasing relative humidity (RH) and decreased with increasing UV dose. Under a constant UV dose with visible light absent, the UV inactivation rate of airborne M. parafortuitum cells decreased by a factor of 4 as RH increased from 40 to 95%; however, under identical conditions with visible light present, the UV inactivation rate of airborne cells decreased only by a factor of 2. When irradiated in the absence of visible light, cellular cyclobutane thymine dimer content of UV-irradiated airborne M. parafortuitum and Serratia marcescens increased in response to RH increases. Results suggest that, unlike in waterborne bacteria, cyclobutane thymine dimers are not the most significant form of UV-induced DNA damage incurred by airborne bacteria and that the distribution of DNA photoproducts incorporated into UV-irradiated airborne cells is a function of RH.
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Stephen, K. W., D. Campbell et R. Strang. « A two-year visible light/UV light filled sealant study ». British Dental Journal 159, no 12 (décembre 1985) : 404–5. http://dx.doi.org/10.1038/sj.bdj.4805747.

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Luo, Kaiyi, Jing Li, Wenyu Hu, Han Li, Qiuping Zhang, Huan Yuan, Fei Yu, Ming Xu et Shuyan Xu. « Synthesizing CuO/CeO2/ZnO Ternary Nano-Photocatalyst with Highly Effective Utilization of Photo-Excited Carriers under Sunlight ». Nanomaterials 10, no 10 (29 septembre 2020) : 1946. http://dx.doi.org/10.3390/nano10101946.

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The construction of heterostructured photocatalyst with an appropriate energy band structure will help realize highly efficient photo-excited charge separation. In this study, ternary CuO/CeO2/ZnO nano-particle (NP) composites were synthesized by a facile two-step sol-gel method, which exhibit significantly enhanced photocatalytic degradation performance for various organic pollutants under UV and visible light excitation. The photo-responses to both UV and visible light, as well as the visible light absorption and utilization rates of ZnO are found to be synergistically intensified by CeO2 and CuO co-coupling. The first-order kinetic constants (K) of 3%CuO/CeO2/ZnO for methylene blue (MB) degradation are ~3.9, ~4.1 and ~4.8 times higher than ZnO under UV light, visible light and simulated sunlight illumination, respectively. The roles of CuO and CeO2 in optical properties and photo-degradation under UV and visible light were explored. Besides, the photogenic holes (h+) of ZnO, CeO2, and the produced hydroxyl radicals (·OH) are proved to be the main active species under UV light. Dissimilarly, under visible light, the superoxide radicals (·O2−) formed by the reactions between oxygen molecules and the photo-generated electrons (e−) of CuO moving towards the catalysts surface are also found to be important for promoting dye decomposition. The improved photo-responses, the well-matched band structure that facilitates charge transfer processes, and the highly efficient utilization of the photo-excited carriers of the ternary nano-heterostructure are suggested to be the key factors for the remarkable enhancement of photocatalytic performance of ZnO nano-photocatalyst. This work offers a low-cost strategy to acquire highly active UV and visible light-driven photocatalyst.
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Sipauba Carvalho da Silva, Yhang Ricardo, Rihito Kuroda et Shigetoshi Sugawa. « A Highly Robust Silicon Ultraviolet Selective Radiation Sensor Using Differential Spectral Response Method ». Sensors 19, no 12 (19 juin 2019) : 2755. http://dx.doi.org/10.3390/s19122755.

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This paper presents a silicon ultraviolet radiation sensor with over 90% UV internal quantum efficiency (QE) and high selectivity to the UV waveband without using optical filters. The sensor was developed for applications that require UV measurement under strong background visible and near-infrared (NIR) lights, such as solar UV measurement, UV-C monitoring in greenhouses or automated factories, and so on. The developed sensor is composed of monolithically formed silicon photodiodes with different spectral sensitivities: a highly UV responsive photodiode with internal quantum efficiency (QE) of nearly 100% for UV light, and a lowly UV responsive photodiode with UV internal QE lower than 10%. The photodiodes were optimized to match their visible and NIR light responsivity, and the UV signal is extracted from the background radiation by using the differential spectral response method. With this approach, an internal QE of over 90% for UV light was obtained, with a residual internal QE to non-UV light lower than 20% for 400 nm, 5% for 500 nm, 2% for 600 nm and 0.6% to NIR light. The developed sensor showed no responsivity degradation after exposure towards strong UV light. It was confirmed by the simulation results that the residual responsivity is further suppressed by employing an on-chip band-rejection optical layer consisting of several layers of silicon oxide and silicon nitride films.
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Zhao, Zhiguo, Xian Zhang, Xuying Niu, Rui Zhang, Zaijin Fang, Zhi Chen et Hong Jia. « Photoelectric properties of glass-ceramics containing KTb2F7 nanocrystals for UV detection ». RSC Advances 13, no 42 (2023) : 29419–26. http://dx.doi.org/10.1039/d3ra05044k.

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Oxyfluoride glass-ceramic containing KTb2F7 nanocrystals can convert UV light into visible light, and then the visible light is absorbed by Si-APD to produce a photocurrent. This UV detector has a large dynamic linear response range, fast response speed and high sensitivity.
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Thèses sur le sujet "UV-Visible light"

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Chen, Xi. « Noble metal photocatalysts under visible light and UV light irradiation ». Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/47008/1/Xi_Chen_Thesis.pdf.

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One of the greatest challenges for the study of photocatalysts is to devise new catalysts that possess high activity under visible light illumination. This would allow the use of an abundant and green energy source, sunlight, to drive chemical reactions. Gold nanoparticles strongly absorb both visible light and UV light. It is therefore possible to drive chemical reactions utilising a significant fraction of full sunlight spectrum. Here we prepared gold nanoparticles supported on various oxide powders, and reported a new finding that gold nanoparticles on oxide supports exhibit significant activity for the oxidation of formaldehyde and methanol in the air at ambient temperature, when illuminated with visible light. We suggested that visible light can greatly enhance local electromagnetic fields and heat gold nanoparticles due to surface plasmon resonance effect which provides activation energy for the oxidation of organic molecules. Moreover, the nature of the oxide support has an important influence on the activity of the gold nanoparticles. The finding reveals the possibility to drive chemical reactions with sunlight on gold nanoparticles at ambient temperature, highlighting a new direction for research on visible light photocatalysts. Gold nanoparticles supported on oxides also exhibit significant dye oxidation activity under visible light irradiation in aqueous solution at ambient temperature. Turnover frequencies of the supported gold nanoparticles for the dye degradation are much higher than titania based photocatalysts under both visible and UV light. These gold photocatalysts can also catalyse phenol degradation as well as selective oxidation of benzyl alcohol under UV light. The reaction mechanism for these photocatalytic oxidations was studied. Gold nanoparticles exhibit photocatalytic activity due to visible light heating gold electrons in 6sp band, while the UV absorption results in electron holes in gold 5d band to oxidise organic molecules. Silver nanoparticles also exhibit considerable visible light and UV light absorption due to surface plasmon resonance effect and the interband transition of 4d electrons to the 5sp band, respectively. Therefore, silver nanoparticles are potentially photocatalysts that utilise the solar spectrum effectively. Here we reported that silver nanoparticles at room temperature can be used to drive chemical reactions when illuminated with light throughout the solar spectrum. The significant activities for dye degradation by silver nanoparticles on oxide supports are even better than those by semiconductor photocatalysts. Moreover, silver photocatalysts also can degrade phenol and drive the oxidation of benzyl alcohol to benzaldehyde under UV light. We suggested that surface plasmon resonance effect and interband transition of silver nanoparticles can activate organic molecule oxidations under light illumination.
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Liu, Xiaolu. « UV and Visible Light Active Nanostructure Photocatalysts for Disinfection and Decomposition of Biohazards ». Thesis, Griffith University, 2015. http://hdl.handle.net/10072/367249.

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Rapid disinfection and effective removal of biohazards from water is important and necessary for safeguarding water, due to availing public health and environmental concerns. To achieve this aim, many techniques such as ultraviolet, chlorination, ultrasonic and ozone have been widely investigated and employed, though there are many drawbacks in these methods which are becoming more problematic in the developing world. In recent decades, two advanced oxidation techniques, photocatalysis (PC) and photoelectrocatalysis (PEC), have drawn extensive attentions, as they have displayed great potentials to be more sustainable, affordable, safer and robust for water purification technologies. There are still many issues however need to be solved, such as the identification of reaction intermediates, development of rate expressions and the photocatalytic efficiencies of the photocatalysts are still far from satisfaction. Therefore, it is necessary to develop high efficiency photocatalysts and study the fundamental mechanisms in the PC and PEC processes. In this thesis, three types of UV and/or visible light active nanostructured TiO2 films with different structures and crystal phases have been developed, the fundamental aspects such as the electron transport properties in the photocatalyst films have been studied in detail, and the disinfection and decomposition performances of the obtained photocatalysts against Escherichia coli (E. coli) bacteria have been investigated. To achieve these objectives, systematic studies have been performed including the establishment of experimental methodology, characterisations of nanomaterials, performance evaluation and mechanistic aspects.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
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Wang, Dongsheng [Verfasser]. « Photoresponsive azobenzene/cyclodextrin supramolecular systems : from UV-light-responsive to visible-light-responsive / Dongsheng Wang ». Mainz : Universitätsbibliothek Mainz, 2017. http://d-nb.info/1130618366/34.

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Han, Taejun. « Effect of visible and UV radiation on early sporophytes of species of the Laminariales ». Thesis, University of Liverpool, 1992. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316578.

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Hudaya, Tedi Chemical Sciences &amp Engineering Faculty of Engineering UNSW. « Synthesis, characterisation, and activity of novel TiO2-based photocatalysts for organic pollutant photodestruction under UV and visible-light irradiation ». Publisher:University of New South Wales. Chemical Sciences & ; Engineering, 2008. http://handle.unsw.edu.au/1959.4/42612.

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Titania-based photocatalysts have been extensively studied for the oxidative photodestruction of organic pollutants in wastewaters, releasing non-toxic substances such as CO2, HCl, and water. However, commercial exploitation of this process is limited by the fact that titania is only active under UV irradiation (wavelength below about 388 nm), which is only less than 5% of solar light energy. Sol-gel synthesised catalyst specimens were characterised to determine the correlation between preparation conditions on morphology (XRD, SEM), optical (bandgap energy level) and physicochemical properties (BET surface area, pore volume, acid site density, acid site strength and type) of the photocatalysts. These spesific properties would then be linked to their photoactivity using aqueous aliphatic and aromatic model pollutants. This study has demonstrated that sol-gel synthesised doped titania photocatalysts, especially Pt/TiO2, may be used to effectively degrade non-volatile acids (DL-malic acid, dichloroacetic acid, and p-hydroxybenzoic acid) under visible light and UV irradiation with significant photoactivity suitable for the solar light application of photocatalytic wastewater treatment. A significant drop in band-gap energy was found for all titania sol-gel catalysts doped with Pt, Co, and Ce with values between 1.41 to 1.78 eV. The BET areas of the photocatalysts were also higher (65-117 m2/g) than that of Degussa P25 (50 m2/g). The visible-light photomineralisation of the three pollutants with Pt-TiO2 specimen were further extended to evaluate the effects of major variables in a bubble-column photoreactor on the photodegradation activities. Those major variables were lamp intensity, oxygen concentration, initial pH, catalyst dosage, and inital pollutant concentration. All the three pollutants seemed to follow the Langmuir-Hinselwood model with dual adsorption sites which implicated a bimolecular surface rate-limiting step probably between the adsorbed organic substrate and a surface hydroxyl (or peroxy) radical. A study of the CeyCoxTi(1-x)O3+d perovskite was conducted to investigate the influence of metal composition and pH on the intrinsic optophysical attributes as well as p-hydroxybenzoic acid degradation under UV irradiation. The perovskite UV photoactivities were lower than that of pure TiO2 likely due to excessive loading (metal content) creating new oxide phases act as electron-hole recombination center, regardless better physicochemical attributes of some of the perovskite samples. The role of aging time and calcination temperature on the sol-gel synthesised TiO2 was also explored. Higher calcination temperature (from 250 to 700 0C) resulted in TiO2 photocatalysts with better crystallinity, which is important for OH group formation as active sites for photodegradation. Despite of some advantages from higher temperature preparation, some detrimental effects such as decreased acidity attributes, surface area, and pore volume were also observed. The significant red-shift of sol-gel synthesized TiO2 into visible light, especially for 250 0C specimen since 600 or 700 0C had extremely low activities, has promising implications that this specimen might be used for solar application to substitute Pt-doped TiO2 in order to produce a more cost effective photocatalyst. Aging period (1 to 14 days) did not have any discernible effect on the band-gap value and acid-site density. Even so, the highest acid site strength was obtained with an aging time of 10 days. From the overall perspective, aging time longer than 3 days did not bring noticeable benefits to both catalyst attributes and photoactivities.
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Krasnow, Mark Neil. « Analysis of phenolic biosynthesis in Vitis vinifera L. cell suspension cultures to visible light, UV light, and methyl jasmonate treatments / ». For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2004. http://uclibs.org/PID/11984.

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Matallana, Surget Sabine-Astrid Biotechnology &amp Biomolecular Sciences Faculty of Science UNSW. « Physiological and molecular responses of the marine oligotrophic ultramicrobacterium Sphingopyxis Alaskensis rb2256 to visible light and ultraviolet radiation ». Awarded By:University of New South Wales. Biotechnology & ; Biomolecular Sciences, 2009. http://handle.unsw.edu.au/1959.4/43251.

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Ultraviolet radiation reaching the Earth’s surface (UVR, 280-400 nm) may penetrate deep into the clear oligotrophic waters influencing a large part of the euphotic layer. Marine heterotrophic bacteria at the surface of the oceans are especially sensitive to the damaging solar radiation due to their haploid genome with little or no functional redundancy and lack of protective pigmentation. In a context of climate change and ozone depletion, it is clearly important to understand the physiology and underlying molecular UVR responses of abundant marine bacteria species. We chose the marine ultramicrobacterium Sphingopyxis alaskensis as a reference species to study the impact of solar radiation due to its numerical abundance in oligotrophic waters and its photoresistance, previously reported. For this purpose, we focused on the formation of the two major UVB-induced DNA photoproducts (CPDs and 6-4PPs) as well as the differential protein expression under solar radiation. We first demonstrated that the GC content of prokaryotic genome had a major effect on the formation of UVB-induced photoproducts, quantified by HPLC-MS/MS. Due to its high GC content, S. alaskensis presented a favoured formation of highly mutagenic cytosine-containing photoproducts and therefore would be more susceptible to UVinduced mutagenesis. By comparing S. alaskensis to another marine bacterium Photobacterium angustum, we observed for the latter strain a remarkable resistance to high UVB doses associated with a decrease in the rate of formation of CPDs explained by a non-conventional activity of photolyase. We also demonstrated that DNA damage in S. alaskensis was markedly modulated by growth temperature and time spent in stationary phase. In order to assess the effects that environmental UV-R had on regulatory networks and pathways of S. alaskensis, and determine how the cell’s physiology was affected, a quantitative proteomics investigation was performed. Changes in proteome were analyzed, with the recent and powerful mass spectrometry based approach using iTRAQ methodology. Approximately, one third of the proteome of S. alaskensis was identified, with 119 statistically and significantly differentially abundant proteins. Cellular processes, pathways and interaction networks were determined and gave us unique insight into the biology of UV response and adaptation of S. alaskensis.
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Newkirk, Scott Hunter. « Detection levels of drinking water contaminants using field portable ultraviolet and visible light (uv/vis) spectrophotometry / ». Download the thesis in PDF, 2005. http://www.lrc.usuhs.mil/dissertations/pdf/NEWKIRK2005.pdf.

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Nonoyama, Akihisa. « Using Multiwavelength UV-Visible Spectroscopy for the Characterization of Red Blood Cells : An Investigation of Hypochromism ». [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000508.

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Pelaez, Miguel. « Development of Novel Visible and Solar Light-Activated Nanostructured Nitrogen-Fluorine Titanium Dioxide Photocatalyst for the Removal of Cyanotoxins in Water ». University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1337958461.

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Chapitres de livres sur le sujet "UV-Visible light"

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Klabunde, Kenneth J. « Visible and UV Light Photocatalysts in Environmental Remediation ». Dans ACS Symposium Series, 179–89. Washington, DC : American Chemical Society, 2010. http://dx.doi.org/10.1021/bk-2010-1045.ch010.

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Witt, A. N. « Diffuse Galactic Light in the UV and Visible ». Dans The Galactic and Extragalactic Background Radiation, 127–38. Dordrecht : Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0653-2_19.

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Rekha, S., et E. I. Anila. « Photoluminescence Investigations of UV, Near UV, and Visible Light Excited CaS:Eu Nanophosphors ». Dans Nanostructured Smart Materials, 13–28. First edition. : Apple Academic Press, 2021. http://dx.doi.org/10.1201/9781003130468-2.

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Pichler, G., T. Ban, H. Skenderović et D. Aumiler. « Atomic and Molecular Spectroscopy with UV and Visible Superbright LEDs ». Dans UV Solid-State Light Emitters and Detectors, 271–78. Dordrecht : Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2103-9_23.

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Al-Awadhi, Safaa, et Mustafa Al-Shemali. « Spectro Absorption ». Dans Atlas of Fallen Dust in Kuwait, 206–46. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-66977-5_9.

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Abstract Ultraviolet–visible UV-VIS. Varian Bio Cary 100 UV–VIS instrument was used for measuring the spectrum of dust samples. The certified materials according to Lab sphere SRS. 99–020 were used and the dust samples were placed in a cuvette (10 mm) and placed on the diffuse reflectance accessory. Measurement was done with respect to the reference. The UV–VIS spectra cover the regions from 900 to 190 nm which includes the near-infrared region, visible light regions, and ultraviolet regions. The FT-IR data shows the different chemical content of dust in the scanning of what possible compounds can be found in dust particles for required further analysis. The dust absorption of the light spectrum in Kuwait was revealed in maps according to seasons showing higher and lower concentrations of light absorption of ultraviolet, violet, blue, cyan, green, yellow, orange, red, infrared.
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Leischner, Vojtěch, et Zdenek Mikovec. « Video Projection on Transparent Materials ». Dans Digital Interaction and Machine Intelligence, 145–52. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11432-8_14.

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AbstractWe propose a new coating for light projection on transparent materials that can open new possibilities for design. What we often struggle with is the lighting of clear glass. By definition, clear glass lets most of the light pass through. We have found a way to turn glass surfaces opaque or transparent by using ultraviolet (UV) fluorescence coating. In combination with a UVA light source, we can project the dynamic content onto a glass surface treated with a special coating that transforms the UVA light into visible light. The added benefit of such a coating is that it can be applied to any organically shaped surface using a spray gun, not just flat surfaces. Another advantage is that the light source is nearly invisible to the human eye, especially with a UV light pass-through filter. We have created a prototype with a modified overhead projector to measure the light characteristics and documented the steps to reproduce our results.
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Manivannan, A., Aaron Peterson, Winn Wilson, Bratindranath Mukherjee et Vaidyanathan Ravi Subramanian. « Hydrogen Production and Photodegradation at TiO2/Metal/CdS Sandwich Using UV–Visible Light ». Dans Semiconductor Materials for Solar Photovoltaic Cells, 141–67. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20331-7_5.

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Vikas, Ruchi Singh, Arti Sharma, Ashish Kumar Dhillon et Soumik Siddhanta. « The Role of Metals in Nanocomposites for UV and Visible Light-Active Photocatalysis ». Dans Green Chemistry and Sustainable Technology, 307–35. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77371-7_11.

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Verlan, V. I., O. T. Bordian, M. S. Iovu, I. P. Culeac et V. E. Zubareva. « Transfer of Light Energy from UV to Visible Domain in Coordination Compounds of Europium(III) ». Dans Advances in Intelligent Systems and Computing, 11–17. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-67459-9_2.

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Forsskåhl, Ingegerd, et Henrik Tylli. « Action Spectra in the UV and Visible Region of Light-Induced Changes of Various Refiner Pulps ». Dans ACS Symposium Series, 45–59. Washington, DC : American Chemical Society, 1993. http://dx.doi.org/10.1021/bk-1992-0531.ch003.

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Actes de conférences sur le sujet "UV-Visible light"

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Hersch, Roger D., Philipp Donzé et Sylvain Chosson. « Color images visible under UV light ». Dans ACM SIGGRAPH 2007 papers. New York, New York, USA : ACM Press, 2007. http://dx.doi.org/10.1145/1275808.1276471.

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Hunter, Chad N., Nicholas R. Glavin, Andrey A. Voevodin, David B. Turner, Michael H. Check, Shawn A. Putnam et Timothy S. Fisher. « Effects of UV-Visible Irradiation on Pool Boiling Behavior of Copper ». Dans ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63460.

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Roughened copper substrates were exposed to a broadband UV-VIS light source during nucleate boiling at a heat flux of 60–70% of the amount expected to result in critical heat flux (CHF) without exposure to a light source. The surface temperature decreased by 0.5–1.0°C within minutes after the UV-VIS light exposure began. CHF occurred after less than 20 minutes of exposure to the light source. Nanoscale features were observed in the light-exposed region of the copper surface after boiling, which were primarily associated with formation of Cu2O. The induced CHF likely occurred due to surface oxide formation, a resultant decrease in wettability of the surface.
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Kumar, Ashish, Akansha Mehta, Manu Sharma et Soumen Basu. « Mesoporous Au/TiO2nanocomposite photocatalysts with enhanced UV and visible light photocatalytic activity ». Dans Proceedings of the International Conference on Nanotechnology for Better Living. Singapore : Research Publishing Services, 2016. http://dx.doi.org/10.3850/978-981-09-7519-7nbl16-rps-266.

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Glaser, Tilman, Siegmund Schroeter, Ruediger Poehlmann, Hartmut Bartelt et Hans-Joerg Fuchs. « Single- and zero-order binary phase gratings for visible and UV light ». Dans Lasers and Optics in Manufacturing III, sous la direction de Olivier M. Parriaux, Ernst-Bernhard Kley, Brian Culshaw et Magnus Breidne. SPIE, 1997. http://dx.doi.org/10.1117/12.281251.

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Stepuro, Ivan I., Raisa I. Adamchuk, T. P. Piletskaja et Slavomir S. Anufrik. « Formation of NO under action of UV and visible light on S-nitrosocompounds ». Dans LOB00, sous la direction de Maksymilian Pluta et Anna Cysewska-Sobusiak. SPIE, 2001. http://dx.doi.org/10.1117/12.432990.

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Leuschner, F. Wilhelm, Christina J. Lotriet et B. Francois Denner. « Spectral reflectance and transmittance in dental enamel for UV, visible, and NIR light ». Dans International Symposium on Biomedical Optics Europe '94, sous la direction de Hans J. Albrecht, Guy P. Delacretaz, Thomas H. Meier, Rudolf W. Steiner, Lars O. Svaasand et Martin J. C. van Gemert. SPIE, 1995. http://dx.doi.org/10.1117/12.199210.

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Nishida, Toshio, et Naoki Kobayashi. « Highly efficient AlGaN-based UV-LEDs and their application as visible light sources ». Dans Symposium on Integrated Optoelectronic Devices, sous la direction de E. F. Schubert et H. Walter Yao. SPIE, 2002. http://dx.doi.org/10.1117/12.469204.

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Farley, Carlton W., Sandra Sadate, Aschalew Kassu et Anup Sharma. « Transmission of UV/visible light through model human epidermis at varying ambient humidity ». Dans SPIE Optical Engineering + Applications, sous la direction de Leonard M. Hanssen. SPIE, 2014. http://dx.doi.org/10.1117/12.2062154.

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Kharcheva, Anastasiia V., Svetlana V. Patsaeva, Nataliya E. Borisova, Dmitriy A. Kharitonov et Zinaida Charyshnikova. « Photophysical properties of europium salts with excitation in UV and visible-light range ». Dans XIV International Conference on Pulsed Lasers and Laser Applications (AMPL-2019), sous la direction de Anton V. Klimkin, Victor F. Tarasenko et Maxim V. Trigub. SPIE, 2019. http://dx.doi.org/10.1117/12.2548838.

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Candeo, Alessia, Paolo Farinello, Cristian Manzoni et Giulio Cerullo. « Generation of sub-10 fs UV light by up-conversion of visible pulses ». Dans 2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC. IEEE, 2013. http://dx.doi.org/10.1109/cleoe-iqec.2013.6800882.

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Rapports d'organisations sur le sujet "UV-Visible light"

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Bikyashev, Envyar. Synthesis and photocatalytic properties of nanocomposites Fe2O3/C3N4 under UV and visible light. Peeref, juillet 2023. http://dx.doi.org/10.54985/peeref.2307p1562394.

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Chalutz, Edo, Charles Wilson, Samir Droby, Victor Gaba, Clauzell Stevens, Robert Fluhr et Y. Lu. Induction of Resistance to Postharvest Diseases and Extension of Shelf-Life of Fruits and Vegetables by Ultra-Violet Light. United States Department of Agriculture, février 1994. http://dx.doi.org/10.32747/1994.7568093.bard.

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Following preliminary observations by one of the collaborating scientists on this project and the completion of a 1-year, BARD-supported feasibility study (IS-1908-90F), this 3-year BARD project has been executed. The main objectives of the research were to elucidate biochemical and pathological aspects of UV-induced resistance in fruits and vegetables, to characterize physical and biological variables of induced resistance and delay of ripening, and to explore the application of the treatment as a control practice of postharvest diseases and shelf-life extension of fruits and vegetables. Our findings, which are detailed in numerous joint publications, have shown that the effect of UV-C light on induction of resistance and delay of ripening is a general one and of wide oddurrence. Apart from surface sterilization of the commodity, the reduction of decay of different fungi has been associated with and induced resistance phenomenon which gradually builds up within 24 to 48 hours after the UV treatment and can be reversed by visible light. In citrus, induced resistance has been associated with increased activity of the enzymes phenylalanine ammonia-lyase and peroxidase, and with the levels of endglucanase and chitinase. In tomato, resistance was correlated with the production of high levels of tomatine. Our study of some molecular aspects of the induced resistance in grapefruit has revealed the induction of a cDNA which represents a gene encoding for an isoflavone reductase-like protein that, in legumes, has been associated with phytoalexin biosynthesis. This gene was cloned and sequenced. Delay of ripening was associated in tomato with inhibition of ethylene production, carotenoid synthesis, and chlorophyll degradation and with the presence of high levels of polyamines. In peach fruit epiphytic populations of a yeast increased following the UV treatment. Pilot-size treatment and packing lines were constructed in the US and Israel to test the application of the UV treatment on a semi-commercial scale. Although effective in reduction of decay and delay of ripening, a number of problems will have to be addressed before practical application of this methodology can be realized. The main issues are associated with the temporal and variable response to the treatment, and its relationship to the maturity and date of harvest of the commodity.
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