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Journal articles on the topic 'Ultra violet (UV)'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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1

NERGUIZIAN, Vahé, Mustapha RAFAF, Muthukumaran PACKIRISAMY, and Ion STIHARU. "ULTRA VIOLET DETECTION SENSORS." International Journal of High Speed Electronics and Systems 16, no. 02 (June 2006): 583–88. http://dx.doi.org/10.1142/s0129156406003862.

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This article presents an innovative and creative approach to detect harmful level of Ultra Violet light on human skin. Different commercial UV sensors are evaluated for comparison. The comparison is made for performance, cost and dimension. The proposed affordable UV sensor solutions are presented using chemical and MEMS/MOEMS technologies. The UV dynamic sensor detects the harmful level of UV and informs the user about the eventual UV radiation risk. The proposed two solutions consider chemical material for UV detection and different actuation mechanism to inform the UV harmful level to the user. These sensors are non disposable and are packaged for visual monitoring (without battery) and acoustic operation (using a battery).

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2

WAKABAYASHI, Kazutami. "UV (Ultra Violet) ・VR (Visible Radiation) Cured Adhesives." Journal of the Japan Society of Colour Material 87, no. 10 (2014): 367–72. http://dx.doi.org/10.4011/shikizai.87.367.

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3

Muhamed, S. Z., Mohamad Hafiz Mamat, N. D. Md Sin, and Mohamad Rusop. "Ultra-Violet Photoresponse Characteristics of Nanostructured Al Doped Zinc Oxide Thin Films Based Ultra-Violet Sensor." Advanced Materials Research 667 (March 2013): 569–72. http://dx.doi.org/10.4028/www.scientific.net/amr.667.569.

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Nanostructured Aluminum (Al) doped Zinc Oxide (ZnO) thin films based ultra-violet (UV) sensors were prepared on glass substrates using immersion technique at different immersion times. Surface morphology results as characterized by scanning electron microscope (SEM) show that all prepared nanostructured Al doped ZnO were in form of nanorod structures with the typical diameter in the range of 60-250nm and the length within several micrometers. Photocurrent measurement results of the fabricated UV photoconductive sensor from nanostructured Al doped ZnO thin film immersed at 1 hr gives the highest photocurrent intensity compared with other samples.

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4

Asri, Mahanani Tri, and Isnawati Isnawati. "DAYA PATOGENESITAS Helicoverpa armigera Nuclear Polyhedrosis Virus HaNPV SETELAH TERKENA RADIASI SINAR ULTRAVIOLET." Berkala Penelitian Hayati 6, no. 1 (December 31, 2000): 65–70. http://dx.doi.org/10.23869/bphjbr.6.1.20008.

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This research is about pathogen capacity of the Helicoverpa armigera nuclear Polyhedrosis Virus (HaNPV) after irradiation by ultra violet (UV) light. The HaNPV is the one kind of the virus which attack the insect Helicoverpa armigera-attacker the some species of the crop life tobacco, cotton, potato, tomato. Because of that the HaNPV can be used as the biological control of the pest. Some researcher stated that the pathogen capacity of the HaNPV is decrease if the virus was expose in the ultra violet (UV) light. Because of the fact the virus in not useful as the biological control of the pest in the land corp. This research to test the statement. Laboratory experimental was done to tested the pathogen capacity of the HaNPV after irradiation treatment by the ultra violet light. The intensity of the UV light in this experiment were 28.7 lux, 97.3 lux, and 127.4 lux with the lighting period were 0, 1, 3, 6, 9, 12, and 15. The result of the research stated that the pathogen capacity of the HaNPV was not influenced by ultra violet light. So the virus is still useful as the biological control of the pest in the land crop.

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5

Yu, Hak Ki. "Ultra Violet (UV) Sensor based on Oxide Ceramic Materials." Ceramist 22, no. 1 (March 31, 2019): 27–35. http://dx.doi.org/10.31613/ceramist.2019.22.1.03.

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6

Zeng, Wenbo, Shaopeng Wu, Ling Pang, Haohao Chen, Jinxuan Hu, Yihan Sun, and Zongwu Chen. "Research on Ultra Violet (UV) aging depth of asphalts." Construction and Building Materials 160 (January 2018): 620–27. http://dx.doi.org/10.1016/j.conbuildmat.2017.11.047.

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7

Said, M. A., Brenda Dingwall, A. Gupta, A. M. Seyam, G. Mock, and T. Theyson. "Investigation of ultra violet (UV) resistance for high strength fibers." Advances in Space Research 37, no. 11 (January 2006): 2052–58. http://dx.doi.org/10.1016/j.asr.2005.04.098.

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8

Kumar Yadav, Pradeep, Kamal Singh, and Jitendra Bhaskar. "Design and Development of Ultra Violet Curing Based 3-D Printer." INTERNATIONAL JOURNAL OF ADVANCED PRODUCTION AND INDUSTRIAL ENGINEERING 5, no. 3 (July 5, 2020): 16–22. http://dx.doi.org/10.35121/ijapie202007343.

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UV light technology-based 3D printer is commonly known as Stereolithography (SLA) 3D printer. Photopolymers in liquid form is cured under the beam of UV light to form layer by layer 3D model. A beam of light is pointed that cures a limited area and takes a long time to 3D print a part. An effort has been made in this work to design and fabricate a mask and UV light-based 3D printer for printing 3D models from a liquid photopolymer resin. Samples were also printed to evaluate the performance of this printer. Performance tests were very positive to make this model a commercial machine for printing models for medical applications.

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9

Dong, Tian, Jian Hua Tong, Chao Bian, Jizhou Sun Sun, and Shan Hong Xia. "Thermal Assisted UV Digestion Utilizing Nano-TiO₂ Photocatalyst for the Detection of Total Phosphorous." Key Engineering Materials 562-565 (July 2013): 964–69. http://dx.doi.org/10.4028/www.scientific.net/kem.562-565.964.

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This work presents a novel thermal assisted ultra-violet (UV) photocatalysis oxidation method for total phosphorus (TP) detection. A 365nm wavelength UV light was used as the UV light source, and the TiO2 particles, immobilized on silicon wafer, were used as the catalyst. The sodium glycerophosphate was digested as the typical compound of TP. The digested samples were determined by spectrophotometry after the phosphomolybdenum blue reaction. The catalyst can be used repetitively with long-term stability in this work. For the photocatalysis digestion process under room-temperature, when the reaction time reached 120min, the conversion rates were 92.31% and 93.66% for 1mg/L and 4mg/L of C3H7Na2O6P solutions, respectively. And conversion rates were 95.48% and 99.37% respectively for thermal assisted ultra-violet (UV) photocatalysis digestion process at the condition of 30min and 60°C. Compared with the conventional thermal digestion method and photocatalysis digestion method for TP detection, this thermal assisted UV digestion method can greatly decrease the digestion time and enhance the efficiency.

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10

Abdullah, Nur Munirah, A. Z. M. Rus, M. F. L. Abdullah, and Hanani Abd Wahab. "Electrical profile of ultra violet (UV) curable renewable polymer graphite (PG) composites." International Journal of Power Electronics and Drive Systems (IJPEDS) 11, no. 1 (March 1, 2020): 459. http://dx.doi.org/10.11591/ijpeds.v11.i1.pp459-465.

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<span>The electrical profiles of the renewable polymer graphite (PG) composites upon ultra violet (UV) curing were investigated. Renewable PG films were prepared by mixing with varying weight percent of graphite (with an increment of 5 wt. % of prepared graphite) up to 30 wt.% and crosslinker. Then, the composites solution was slip casted and cured upon stimulated UV irradiation (UV accelerated weathering tester) at different time exposure (up to 1000 hours) was applied. Small changes on the functional groups of the composites were observed due to UV exposure time by Fourier Transform Infrared Spectroscopy (FTIR). Suggesting that chemical crosslink and chain scissions occurred within renewable polymer graphite composites. Further electrical profile through two point probe and four point probe method recorded visibly fluctuating values for both resistivity and conductivity within its composites range. Proposed here that the removal of organic contaminants and weak materials form both renewable polymer and graphite particles through the UV curing may have an effect on the formation of conductive network stability. </span>

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11

Omiya, Masaki, and Kikuo Kishimoto. "Crack Formation of Ceramic Thin Film on Polymer Substrate." Key Engineering Materials 353-358 (September 2007): 307–10. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.307.

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The aim of this paper is to investigate the effect of ultra-violet (UV) ray irradiation on the crack formation of brittle ceramic coating on polymer substrate. It is well known that ultra-violet ray irradiation degrades the mechanical properties of polymer and polymer-based coating films. We carried out the tensile tests of PET/ITO film specimen after UV irradiation under the microscope and observed the crack formation on ITO surface. Also, we carried out nano-indentation tests of PET substrate after removing ITO layer to characterize the change of the mechanical properties near the interface between PET and ITO. The results show that the number of cracks vertical to loading direction and the rate of vertical crack formation decreased after UV irradiation. Hardness and Young’s modulus of PET substrate increase due to the oxidation of PET after UV irradiation. To explain the relationship between the crack formation and mechanical property change, the energy release rates of the thin film channeling cracks are considered.

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12

Ramteke, D. D., and R. S. Gedam. "Luminescence properties of Gd3+ containing glasses for ultra-violet (UV) light." Journal of Rare Earths 32, no. 5 (May 2014): 389–93. http://dx.doi.org/10.1016/s1002-0721(14)60082-x.

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13

Ismail, Khadijah, and Wardah Abdul Razak. "A Quality Discriminaton within Ultra Violet Spectrum using Optical Sensor for Selected Commercial Oils." MATEC Web of Conferences 201 (2018): 03002. http://dx.doi.org/10.1051/matecconf/201820103002.

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Nowadays ultra violet-visible (UV-Vis) spectrophotometers are widely used and is one of an important analytical instrument in modern day research. This work is conducted to determine oil quality discrimination of different selected oils using optical sensor, where the oil samples are analyzed within ultra violet (UV) spectrum, which ranges from 200nm to 400nm wavelengths. The oils extracted from five plants are analyzed based on the light absorption rate at different wavelengths. Different energy value is required for electron transition from lower level to the higher, due to different molecular structure of the main compound in the oil. The highest absorption rate at wavelength 393 nm is achieved from lemongrass oil, whereas the lowest absorption peak at 368 nm is observed from ginger oil.

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14

Hashmi, Syed Ghufran, Armi Tiihonen, David Martineau, Merve Ozkan, Paola Vivo, Kimmo Kaunisto, Vainio Ulla, Shaik Mohammed Zakeeruddin, and Michael Grätzel. "Long term stability of air processed inkjet infiltrated carbon-based printed perovskite solar cells under intense ultra-violet light soaking." Journal of Materials Chemistry A 5, no. 10 (2017): 4797–802. http://dx.doi.org/10.1039/c6ta10605f.

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The long term stability of air processed inkjet infiltrated carbon based perovskite solar cells (CPSCs) is investigated under intense ultra-violet light soaking equivalent to 1.5 Sun UV light illumination.

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15

Ueda, Ken-Ichi. "Present status and prospect of KrF laser physics and technology–large volume excitation and UV optics." Laser and Particle Beams 7, no. 3 (August 1989): 375–82. http://dx.doi.org/10.1017/s0263034600007333.

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The physics and technology for e-beam generation, large volume excitation and the ultra-violet optics for high power KrF lasers is presented. The potential, due to the charge deposition, induces a return current in the plasma which balances the e-beam current. The local equilibrium mechanism stabilizes the large volume excitation using intense electron beams. The spatial and temporal characteristics of large aperture diodes are analyzed. Substantial progress in ultra violet optics in Japan has been achieved. The damage threshold of HR dielectric coating increases up to 11 J/cm2 by using low absorption materials.

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16

Mardison, NFN, Usman Ahmad, NFN Sutrisno, and Slamet Widodo. "KARAKTERISASI ABSORBANSI LARUTAN DAN PENDUGAAN DERAJAT SOSOH BERAS BERDASARKAN ABSORBANSI PADA SPEKTRUM ULTRA- VIOLET." Jurnal Penelitian Pascapanen Pertanian 15, no. 1 (November 5, 2019): 43. http://dx.doi.org/10.21082/jpasca.v15n1.2018.43-51.

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<p>Teknologi non-destruktif seperti penggunaan gelombang ultra-violet (UV) dapat dijadikan sebagai alternatif dalam menentukan kualitas beras sosoh. Pengembangan metode pengukuran dan karakterisasi beras sosoh berdasarkan absorbansi spektrumnya pada daerah UV sangat berpotensi dalam evaluasi kualitas beras secara non-destruktif. Penelitian ini bertujuan untuk menganalisis spektrum absorbansi UV pada beberapa varietas beras dengan tingkat penyosohan bervariasi dan menentukan hubungan derajat sosoh beras varietas Ciherang dengan spektrum absorbansi UV dari larutan beras dalam pelarut n-heksana. Larutan beras dibuat dengan pelarut n-heksana dengan perlakuan waktu perendaman dan konsentrasi n-heksana, kemudian dilakukan pengukuran absorbansi larutan pada spektrum UV, dan terakhir dilakukan analisis terhadap absorbansi larutan, dalam hubungannya dengan derajat sosoh. Sebelum analisis absorbansi pada spektrum UV dilakukan, didahului dengan dua pra-pengolahan data yaitu derivatif pertama dan normalisasi. Hasil analisis adalah karakteristik spektra untuk enam varietas beras yang diuji memiliki profil dan pola absorbansi pada spektrum UV dan hubungannya dengan dengan derajat sosoh beras varietas Ciherang adalah dengan nilai koefisien korelasi (r) sebesar 0.927. Dari penelitian ini didapatkan metode persiapan sampel terbaik dengan waktu perendaman 2-3 jam, dan dengan konsentrasi larutan beras dalam pelarut n-heksanasebesar 43.3% absorbansi pada spektrum UV paling besar terjadi pada panjang gelombang 330-335 nm.</p><p> </p><p><strong>Non-destructive technology such as the use of ultra-violet (UV) waves can be used as an alternative in determining the quality of milled rice</strong></p><p>The development of method of measuring and characterizing milled rice based on the absorbance of spectra in the UV area is highly potential in milled rice quality evaluation non-destructively. This study aims to analyze the spectrum of UV absorbance for some rice varieties with varying degree of milling and determining relation degree of milling for ciherang rice varieties with the absorption on UV area of rice solution in n-hexane solvent. The rice solution was prepared with n-hexane solvent by treatment of immersion time and n-hexane concentration, then measured the absorbance of the solution on the UV spectrum, and finally analyzed the absorbance of the solution, in relation to the rice degree of milling. Prior to the analysis of absorbance on the UV spectrum, by two pre-processing data, first derivative and data normalization were performed. The results of the analysis are spectral characteristics for the six rice varieties tested were absorbance profile and pattern on the UV spectrum and its relation with the degree of milling for ciherang rice varieties with the correlation coefficient value (r) of 0.927. It was observed from this research the best sample preparation method was that with 2-3 hours of soaking time, and the concentration of rice solution in 43.3% n-hexane solvent, resulted maximum absorbance on UV spectrum by rice solution at wavelengths of 330-335 nm.</p>

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17

Xie, Juan, Yongjing Hao, Meixia Li, Yiwei Lian, and Li Bian. "Preparation of TiO2/ZnO composite catalysts and their photocatalytic activity for degradation of pentachlorophenol." World Journal of Engineering 14, no. 4 (August 7, 2017): 279–83. http://dx.doi.org/10.1108/wje-08-2016-0066.

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Purpose This paper aims to report a novel preparation method of titanium dioxide (TiO2)/zinc oxide (ZnO) composites with different mole ratios of TiO2:ZnO and their photocatalytic activity. Design/methodology/approach TiO2/ZnO composites are prepared by a facile route. X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) and ultra-violet–visible diffuse reflectance spectra (UV-vis DRS) are used to characterize the products. Photocatalytic activity of the samples is evaluated by degradation of persistent organic pollutant pentachlorophenol under ultra-violet (UV) irradiation. Findings It is found that all the as-prepared TiO2/ZnO composites not only have good catalytic activity under UV light irradiation, but also have excellent circulation stability. The optimal mole ratio of TiO2:ZnO is 0.75:1. Originality/value This report presents a simple and rapid method for the preparation of TiO2/ZnO composites with excellent photocatalytic activity. Experimental results could provide useful reference for the treatment of chlorophenols in the future.

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18

Liang, Wei, Liang Feng Niu, Yuan Hao Gao, and Yu Hua Wang. "Photon Cascade Emission of Pr³⁺-Doped K₂YZr(PO₄)₃ Phosphor." Advanced Materials Research 815 (October 2013): 677–81. http://dx.doi.org/10.4028/www.scientific.net/amr.815.677.

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In present work, K2Y1-xZr (PO4)3:Prx3+(0.01x0.05) samples were prepared by solid-state reaction method and their photoluminescence properties were investigated in ultra-violet (UV) and vacuum ultra-violet (VUV) region. The photon cascade luminescence (PCL) of Pr3+had been observed. All the results indicate that, in this Pr3+-doped K2YZr (PO4)3phosphor, even if the1S0state is higher than the lowest 4f5d energy level, the photon cascade emission (PCE) process for Pr3+still could occur under 147 nm and 234 nm (4f15d1state) excitation. Therefore, K2YZr (PO4)3was an ideal host for Pr3+to implement the PCE process successfully.

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19

Su, Dong, Muni Yu, Guangzu Zhang, Shenglin Jiang, YanFeng Qin, and Ming-yu Li. "Highly thermally stable Au–Al bimetallic conductive thin films with a broadband transmittance between UV and NIR regions." Journal of Materials Chemistry C 8, no. 8 (2020): 2852–60. http://dx.doi.org/10.1039/c9tc06496f.

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20

Ying, Haoting, Xin Li, Yutong Wu, Yi Yao, Junhua Xi, Weitao Su, Chengchao Jin, Minxuan Xu, Zhiwei He, and Qi Zhang. "High-performance ultra-violet phototransistors based on CVT-grown high quality SnS2flakes." Nanoscale Advances 1, no. 10 (2019): 3973–79. http://dx.doi.org/10.1039/c9na00471h.

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21

Apollo, Seth, Maurice S. Onyango, and Ochieng Aoyi. "UV Photodegradation and Anaerobic Digestion of MB Dye." Advanced Materials Research 781-784 (September 2013): 2245–48. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.2245.

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Ultra-Violet (UV) photocatalytic degradation and anaerobic digestion (AD) were applied in the treatment of methylene blue (MB) dye. South African natural zeolite was used as a catalyst support and biomass support in the photocatalysis and AD process respectively. It was found that UV photocatalysis pre-treatment of MB dye before the AD process improved its biodegradability. This resulted in higher biogas production coefficient compared to the non-UV pre-treated MB dye.

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22

DeLong, J. M., and K. L. Steffen. "Photosynthetic function, lipid peroxidation, and α-tocopherol content in spinach leaves during exposure to UV-B radiation." Canadian Journal of Plant Science 77, no. 3 (July 1, 1997): 453–59. http://dx.doi.org/10.4141/p96-162.

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Spinach (Spinacia oleracea L. 'Meridian') plants were irradiated for 9 h d−1 for 12 d with ultra-violet-B (UV-B) radiation [13.5 kJ m−2 d−1 of biologically effective UV-B radiation (UV-BBE) + 350 µmol m−2 s−1 of photosynthetically active radiation (PAR)] or PAR (350 µmol m−2 s−1) to determine if incipient UV-B-induced inhibition of photosynthetic function occurred in photosystem 2 (PS2) reaction centers or in the lipid matrix of thylakoid membranes. Chlorophyll concentrations (leaf area basis) in UV-B-irradiated spinach leaves were significantly lower than in PAR plants after 4, 8 and 12 d of exposure. A significant UV-B-induced rise in initial fluorescence (Fo) at days 8 and 10 was accompanied by a decline in the photochemical efficiency (Fv/Fm) ratio, indicating a reduction in the efficiency of PS2 energy harvesting and trapping. When based upon the chlorophyll content of thylakoid membranes, UV-B radiation did not alter lipid per-oxidation but did increase α-tocopherol content compared with the PAR treatment during the first 8 of the 12 exposure days. These data suggest that incipient UV-B damage to the photochemical apparatus did not occur in PS2 reaction center complexes nor in the lipid matrix of the thylakoid membranes. Photosynthetic function was more susceptible to UV-B-induced impairment than thylakoid membrane lipids were to UV-B radiation damage. Key words: ultra-violet-B radiation, chlorophyll fluorescence, lipid peroxidation, α-tocopherol

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23

Choi, Kim, Chu, Noh, Lee, Kwon, Oh, and Kim. "Enhanced Photon Emission Efficiency Using Surface Plasmon Effect of Pt Nanoparticles in Ultra-Violet Emitter." Micromachines 10, no. 8 (August 9, 2019): 528. http://dx.doi.org/10.3390/mi10080528.

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We demonstrate the surface plasmon (SP)-enhanced ultraviolet (UV) emitter using Pt nanoparticles (NPs). The UV emitter is hole-patterned on the p-AlGaN layer to consider the penetration depth of Pt NPs. The Pt NPs with sizes under 50 nm are required to realize the plasmonic absorption in UV wavelength. In this study, we confirm the average Pt NP sizes of 10 nm, 20 nm, and 25 nm, respectively, at an annealing temperature of 600 °C. The absorption of annealed Pt NPs is covered with the 365-nm wavelength. The electroluminescence intensity of SP-UV is 70% higher than that of reference UV emitter without hole-patterns and Pt NPs. This improvement can be attributed to the increase of spontaneous emission rate through resonance coupling between the excitons in multiple quantum wells and Pt NPs deposited on the p-AlGaN layer.

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24

Park, Y. K., Ahmad Umar, S. H. Kim, and Yoon-Bong Hahn. "Solution Grown Ultra-Violet Emitting Quasi-Aligned ZnO Nanotubes." Journal of Nanoscience and Nanotechnology 8, no. 12 (December 1, 2008): 6349–54. http://dx.doi.org/10.1166/jnn.2008.18392.

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Quasi-aligned ZnO nanotubes were grown in a high density on Si substrate via aqueous solution method at low temperature of 65 °C by using zinc nitrate and hexamethylenetetramine. The detailed structural characterizations revealed that the as-synthesized nanotubes are single-crystalline possessing a hexagonal phase and grown along the [0001] direction. Raman-scattering spectrum exhibits a strong and sharp optical-phonon E2 high-mode at 437 cm−1 again confirming the good crystal quality with hexagonal crystal structure for the as-synthesized nanotubes. A strong ultraviolet (UV) emission with a weak and broad orange is observed from the room-temperature photoluminescence (PL) spectrum which substantiates the good optical properties for the as-grown nanotubes. The detailed growth mechanism has also been proposed for the formation of as-grown nanotubes based on chemical reactions involved and different crystallographic habits of wurtzite hexagonal ZnO.

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Kim, Sangmo, Hoang Van Quy, Hyung Wook Choi, and Chung Wung Bark. "Effect of UV-Light Treatment on Efficiency of Perovskite Solar Cells (PSCs)." Energies 13, no. 5 (March 1, 2020): 1069. http://dx.doi.org/10.3390/en13051069.

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We employed ultra-violet (UV) light treatment on the TiO2 layer prior to coating the perovskite layer to improve the solar conversion efficiency of perovskite solar cells (PSCs). A laboratory-made UV treatment system was equipped with various UV light sources (8 W power; maximum wavelengths of 254, 302, and 365 nm). The UV light treatment improved the power conversion efficiency (PCE) while coating the uniformity layer and removing impurities from the surface of cells. After the PSCs were exposed to UV light, their PCE developed approximately 10% efficiency; PBI2 decreased without changing the structure.

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Hsieh, Wen Ching, Wei Ting Tseng, Fuh Cheng Jong, and Hao Tien Daniel Lee. "UV Nonvolatile Sensor Using SANOS Capacitor Device." Materials Science Forum 977 (February 2020): 250–55. http://dx.doi.org/10.4028/www.scientific.net/msf.977.250.

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The silicon-aluminum oxide-nitride-silicon oxide-silicon (hereafter SANOS) could be candidates for ultra violet total dose (hereafter UV TD) nonvolatile sensors. In the case of SANOS UV TD radiation sensors, the UV radiation induces a significant increase of threshold voltage VT. The changes of VT for SANOS after UV radiation have a correlation to the UV TD as well. In this paper, the performance for capacitor types of SANOS UV TD nonvolatile sensor were discussed in detailed. The SANOS capacitor device in this study has demonstrated the better feasibility for UV TD nonvolatile sensor application.

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Niu, Liang Feng, Wei Liang, Chang Zeng Wu, and Yu Hua Wang. "Cooperative Energy Transfer of Er-Gd-Tb System in Tb³⁺, Er³⁺ Co-Doped K₂GdZr(PO₄)₃ as a Potential Visible Quantum Cutting Phosphor." Advanced Materials Research 936 (June 2014): 585–90. http://dx.doi.org/10.4028/www.scientific.net/amr.936.585.

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Tb3+, Er3+co-doped K2GdZr (PO4)3samples were prepared by solid-state reaction method and their photoluminescence (PL) properties were investigated in ultra-violet (UV) and vacuum ultra-violet (VUV) region. The results indicate that the energy transfers from Er3+to Gd3+and from Gd3+to Tb3+required for occurring of visible quantum cutting through down-conversion are efficient. In this cooperative energy transfer process, Gd3+is used as an intermediate of energy transfer between Er3+and Tb3+. The optimal quantum efficiency (QE) of this co-doped system K2GdZr (PO4)3: Er3+, Tb3+phosphor reached to 110%, suggesting a potential visible quantum cutting phosphor in practical application.

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Manikandan, V., S. Balaji, R. Senbagam, R. Vijayakumar, M. Rajarajan, G. Vanangamudi, R. Arulkumaran, R. Sundararajan, and G. Thirunarayanan. "Synthesis and antimicrobial activities of some (E)-N'-1-(substituted benzylidene)benzohydrazides." International Journal of Advanced Chemistry 5, no. 1 (February 26, 2017): 17. http://dx.doi.org/10.14419/ijac.v5i1.7155.

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About ten substituted (E)-N'-1-(substituted benzylidene) benzohydrazides have been synthesized. They are analyzed by their analytical, ultra violet (UV), Fourier transform-IR (FT-IR) and nuclear magnetic resonance (NMR) spectral data and evaluated by antimicrobial activities such antibacterial and antifungal activities.

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Astereki, Shokufeh, Bahram Kamarehie, and Ali Jafari. "2-Chlorophenol Removal of Aqueous Solution Using Advanced Oxidation Processes Resulting from Iron/ Persulfate and Ultra Violet/ Persulfate." Iranian Journal of Toxicology 10, no. 3 (July 1, 2016): 1–8. http://dx.doi.org/10.32598/ijt.10.4.219.2.

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Background: Advanced oxidation processes are used to remove toxic aromatic compounds with low biodegradability, such as 2-chlorophenol. This study investigates the use of Sulfate (SO4-) and persulfate (S2O82-) radicals, as one of the advanced oxidation methods, to remove 2- chlorophenol from aquatic solutions. Materials and Methods: This experimental and pilot-scale study was carried out using two chemical batch reactors one of the reactors equipped with UV lamps and the other was on the hot plate. In Iron/ Persulfate (Fe/S2O82- ) and Ultra violet/ Persulfate (UV/S2O82- ) processes different parameters were investigated. Results: The results show that iron, UV, the initial pH of the solution, persulfate concentration have considerable effects on the elimination of 2-chlorophenol in both processes. In both processes, the maximum elimination occurred in acidic conditions. The elimination efficiency increased by increasing the concentration of 2-chlorophenol and UV intensity, and also by decreasing the concentration of persulfate and iron. Accordingly, in Iron/ persulfate and Ultra violet/ persulfate processes 2-chlorophenol was eliminated with 99.96% and 99.58% efficiencies, respectively. Conclusion: Sulfate radicals which are produced from activated persulfate ions with hot-Fe ion and UV radiation have significant impact on the removal of 2-chlorophenol. Therefore, the processes of Fe/S2O82- and UV/S2O82- can be regarded as good choices for industrial wastewater treatment plants operators in the future.

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Liu, Jingjing, Tengfei Wang, and Fuqiang Nie. "Narrow band resonance in the UV light region of a plasmonic nanotextured surface used as a refractive index sensor." RSC Advances 7, no. 57 (2017): 35957–61. http://dx.doi.org/10.1039/c7ra01642e.

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Jacob, Anju Anna, L. Balakrishnan, S. R. Meher, K. Shambavi, and Z. C. Alex. "Synthesis of Zn1−xCdxO Nanoparticles by Co-Precipitation: Structural, Optical and Photodetection Analysis." International Journal of Nanoscience 17, no. 01n02 (October 12, 2017): 1760015. http://dx.doi.org/10.1142/s0219581x17600158.

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Zinc oxide (ZnO) is a wide bandgap semiconductor with excellent photoresponse in ultra-violet (UV) regime. Tuning the bandgap of ZnO by alloying with cadmium can shift its absorption cutoff wavelength from UV to visible (Vis) region. Our work aims at synthesis of Zn[Formula: see text]CdxO nanoparticles by co-precipitation method for the fabrication of photodetector. The properties of nanoparticles were analyzed using X-ray diffractometer, UV–Vis spectrometer, scanning electron microscope and energy dispersive spectrometer. The incorporation of cadmium without altering the wurtzite structure resulted in the red shift in the absorption edge of ZnO. Further, the photoresponse characteristics of Zn[Formula: see text]CdxO nanopowders were investigated by fabricating photodetectors. It has been found that with Cd alloying the photosensitivity was increased in the UVA-violet as well in the blue region.

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Rosyidah, Kholifatu, Lia Dewi Juliawati, Yana Maolana Syah, Euis Holishotan Hakim, Sjamsul Arifin Achmad, and Lukman Makmur. "Dua Dimer Resveratrol dari Kulit Batang Shorea parvifolia (dipterocarpaceae)." Jurnal Natur Indonesia 12, no. 2 (November 21, 2012): 163. http://dx.doi.org/10.31258/jnat.12.2.163-166.

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Two resveratrol dimers, (-)-ampelopsin F dan (-)-laevifonol were isolated from aceton extract of the stem bark ofShorea parvifolia. The structures of these compounds were determined based on their spectroscopic data includingspectroscopy ultra violet (UV), infra red (IR), nuclear magnetic resonance (1H-NMR, 13C-NMR) and also were comparedto the reported data.

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Journal, Baghdad Science. "We study the effect of Ultra violet rays (A-B) in treatment of Vitiligo (applied Therapy)." Baghdad Science Journal 11, no. 1 (March 2, 2014): 85–92. http://dx.doi.org/10.21123/bsj.11.1.85-92.

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This research evaluated the effect of (UV)(400-320A)Hz(320-220B)Hz on the patient with vitiligo , using it with our new combing therapy that include the oral (Psorlene ) topical , meladinine solution applied on the Vitiligiousns Lesions , In edition to the instralesnional injection in the Vitiligiousns Lesions by long acting steroid (kenacort-A ) by aprecentage of (5%) , after that we expose the patient to UV . The ruslets of this way of treatment more effective by using of the UV rays in the treatment of vitiligo , while the previous treatment that used the UV ray with or with out the psorlene , the results were not effective on controlling of the Vitiligio diseases comparing by the treatment used in this research as it stop’s the spread of the diseases and curing it .

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Singh Butola, Bhupendra, and Mangala Joshi. "Photostability of HDPE Filaments Stabilized with UV Absorbers (UVA) and Light Stabilizers (HALS)." Journal of Engineered Fibers and Fabrics 8, no. 1 (March 2013): 155892501300800. http://dx.doi.org/10.1177/155892501300800107.

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HDPE monofilaments were photostabilized with hindered amine light stabilizers (HALS) and UV absorbers at varying stabilizer concentrations. The filaments were assessed for UV resistance by exposure to simulated outdoor weathering conditions in artificial weathering apparatus and testing the exposed samples at regular intervals for retained tensile properties. Films of HDPE of varying thickness and containing different concentrations of photostbilizers were also prepared. The UV protective ability of the films was assessed by measuring Ultra Violet Protection Factor (UPF). The results indicate that UV absorbers improve the stability of the filaments significantly. However, the best performance was displayed by filaments containing HALS.

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Idrus, N. H. Mohd, and Hasan Zuhudi Abdullah. "Short Review: Effect of UV Light on Precipitation of Hydroxyapatite on TiO₂ in Simulated Body Fluid." Applied Mechanics and Materials 315 (April 2013): 325–29. http://dx.doi.org/10.4028/www.scientific.net/amm.315.325.

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A number of previous studies on titanium dioxide (TiO2) proven the presence of anatase has enhance hydroxyapatite (HAP) precipitation on TiO2surface which beneficial for biomedical usage especially in dental and orthopedics. The anatase phase of TiO2is an ideal photocatalyst agent. It helps to enhance the chemical reaction after irradiating with ultra violet (UV) light. The effect of UV light irradiation to the precipitation of HAP on TiO2surface while soaking in simulated body fluid (SBF) increased the formation of HAP. UV light also can be applied as pre-treatment, where UV light was irradiating before SBF immersion.

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Sethuraman, Ramakrishnan, and Kulandaivelu Govindasamy. "Low dose of ultra violet (UV)-B adaptation enhances yield in rice somaclones." African Journal of Biotechnology 13, no. 1 (January 1, 2014): 127–30. http://dx.doi.org/10.5897/ajb12.1966.

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Ikawa, Hiroumi, Akinori Moroi, Kunio Yoshizawa, Yuriko Saida, Asami Hotta, Takamitsu Tsutsui, Kenichi Fukaya, et al. "Bone regeneration enhancement by ultra-violet (UV) treatment for uHA/PLLA absorbable mesh." Journal of Cranio-Maxillofacial Surgery 45, no. 5 (May 2017): 634–41. http://dx.doi.org/10.1016/j.jcms.2017.02.001.

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RAJI, P., S. SIVAKANTH, K. K. UMESH, S. K. RAMAKRISHNAN, and K. RAMACHANDRAN. "GROWTH, OPTICAL AND THERMAL PROPERTIES OF ZINC OXIDE NANO WIRES." International Journal of Modern Physics B 19, no. 28 (November 10, 2005): 4247–58. http://dx.doi.org/10.1142/s0217979205032711.

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ZnO nano wire synthesized by microemulsion mediated hydrothermal process is characterized by X-ray diffraction, scanning electron microscope, UV–VIS and photoluminescence. The optical and thermal properties are then studied by photoacoustics. These studies reveal that the ZnO nano wires exhibit a strong ultra violet absorption and a relatively weak defect emission.

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Y. Swaid, Sajeda, Eman M. Abdul Zahra, and Abdulminam H. Ali. "Morphological Responses in Two Palm Species Against the Elevation of Ultra Violet Radiation Under Ambient Conditions." Basrah J. Agric. Sci. 33, no. 2 (October 17, 2020): 80–94. http://dx.doi.org/10.37077/25200860.2020.33.2.07.

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Present study was investigate the effect of different UV-doses on morphological defending system features of two palm species Phoenix dactylifera L. and Washingtonia filifera (Lindl.) H. Wendl. The results showed that the morphological and biomass traits of both palm species grown for 30 days under UV-B with a rate of 2 hrs.day-1 were almost improved. Where, the highest leaf width was recorded (1.1 and 0.7 cm) respectively. Conversely, UV-treatment (4-10 hrs.day-1) has adversely affected on almost morphological and biomass features of both species. Where, the less leaf widths were recorded 0.95, 0.8, 0.73, 0.45, 0.43 and 0.40 cm in both palm species. Besides, results also spotted changes in leaf’s surface appearances. However, present investigation concluded that morphological features and biomass of both species were unaffected with low dose of UV-radiation (2 hrs.day-1). But, date palm (P. dactylifera L.) was capable to survive at high dose of radiation conditions reaches 8 hrs.day-1 for 30 days.

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Kameswara Rao, N., F. Sutaria, J. Murthy, S. Krishna, R. Mohan, and A. Ray. "Planetary nebulae with UVIT: Far ultra-violet halo around the Bow Tie nebula (NGC 40)." Astronomy & Astrophysics 609 (January 2018): L1. http://dx.doi.org/10.1051/0004-6361/201732188.

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Context. NGC 40 is a planetary nebula with diffuse X-ray emission, suggesting an interaction of the high-speed wind from WC8 central star (CS) with the nebula. It shows strong C IV 1550 Å emission that cannot be explained by thermal processes alone. We present here the first map of this nebula in C IV emission using broad band filters on the Ultra-Violet Imaging Telescope (UVIT). Aim. We aim to map the hot C IV-emitting gas and its correspondence with soft X-ray (0.3–8 keV) emitting regions in order to study the shock interaction between the nebula and the ISM. We also aim to illustrate the potential of UVIT for nebular studies. Methods. We carry out a morphological study of images of the nebula obtained at an angular resolution of about 1.3″ in four UVIT filter bands that include C IV 1550 Å and [C II] 2326 Å lines as well as UV continuum. We also make comparisons with X-ray, optical, and IR images from the literature. Results. The [C II] 2326 Å images show the core of the nebula with two lobes on either side of CS similar to [N II]. The C IV emission in the core shows similar morphology and extent to that of diffuse X-ray emission concentrated in nebular condensations. A surprising UVIT discovery is the presence of a large faint far UV (FUV) halo in an FUV filter with λeff of 1608 Å. The UV halo is not present in any other UV filter. The FUV halo is most likely due to UV fluorescence emission from the Lyman bands of H2 molecules. Unlike the optical and IR halo, the FUV halo trails predominantly towards the south-east side of the nebular core, opposite to the CS’s proper motion direction. Conclusions. Morphological similarity of C IV 1550 Å and X-ray emission in the core suggests that it results mostly from the interaction of strong CS wind with the nebula. The FUV halo in NGC 40 highlights the extensive existence of H2 molecules in the regions even beyond the optical and IR halos. Thus UV studies are important to estimate the amount of H2, which is probably the most dominant molecule and significant for mass-loss studies.

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Salvadori, Giacomo, Davide Lista, Chiara Burattini, Luca Gugliermetti, Francesco Leccese, and Fabio Bisegna. "Sun Exposure of Body Districts: Development and Validation of an Algorithm to Predict the Erythemal Ultra Violet Dose." International Journal of Environmental Research and Public Health 16, no. 19 (September 27, 2019): 3632. http://dx.doi.org/10.3390/ijerph16193632.

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Solar Ultra-Violet (UV) radiation has positive and negative effects on human body tissues. Small doses of solar UV radiation are needed by the human skin for the activation of the vitamin D production. Overexposure to solar UV radiation can produce acute and long-term negative effects, such as sunburns and, in the worst cases, cataracts and skin cancers. For this reason, knowing the amount of UV doses received by people is essential to evaluate their risk to UV overexposure and to evaluate the adequate countermeasure to avoid the negative effects. The original contribution of the present study consists in having searched, collected, adapted and processed a series of technical information and analytical relations, developing an algorithm suitable for the calculation of the erythemal UV dose on sloped surfaces exposed to solar radiation, which at the moment is not present in the scientific literature. The results obtained by the algorithm have been compared to the results of a field measurements campaign, carried out in three different Italian sites. Results comparison indicated that measured and calculated values show a sufficient level of agreement, with a mean absolute error equal to 20%.

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Nasreen, Adeela, Muhammad Umair, Khubab Shaker, Syed Talha Ali Hamdani, and Yasir Nawab. "Development and characterization of three-dimensional woven fabric for ultra violet protection." International Journal of Clothing Science and Technology 30, no. 4 (August 6, 2018): 536–47. http://dx.doi.org/10.1108/ijcst-02-2018-0013.

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Purpose The purpose of this paper is to investigate the effect of materials, three dimensional (3D) structure and number of fabric layers on ultraviolet protection factor (UPF), air permeability and thickness of fabrics. Design/methodology/approach Total 24 fabrics samples were developed using two 3D structures and two weft materials. In warp direction cotton (CT) yarn and in weft direction polypropylene (PP) and polyester (PET) were used. Air permeability, thickness and UPF testings were performed and relationship among fabric layers, air permeability, thickness and UPF was developed. Findings UPF and thickness of fabrics increases with number of fabric layers, whereas air permeability decreases with the increase in number of fabric layers. Furthermore, change of multilayer structure from angle interlock to orthogonal interlock having same base weave does not give significant effect on UPF. However, change of material from polyester (PET) to polypropylene (PP) has a dominant effect on UPF. Minimum of three layers of cotton/polyester fabric, without any aid of ultraviolet radiation (UV) resistant coating, are required to achieve good. Cotton/polyester fabrics are more appropriate for outdoor application due to their long-term resistance with sunlight exposure. Originality/value Long-term exposure to UV is detrimental. So, there is need of proper selection of material and fabric to achieve ultraviolet protection. 3D fabrics have yarns in X, Y as well as in Z directions which provide better ultraviolet protection as compared to two dimensional (2D) fabrics. In literature, mostly work was done on ultraviolet protection of 2D fabrics and surface coating of fabrics. There is limited work found on UPF of 3D woven fabrics.

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Nakatani, S. K., Y. H. Han, T. Takahashi, and T. Awano. "Broadband Spectroscopy of Nanoporous-Gold Promoter." Advanced Electromagnetics 2, no. 3 (February 14, 2014): 5. http://dx.doi.org/10.7716/aem.v2i3.170.

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The efficiency of UV photocatalysis on TiO2 particles was increased by mixing TiO2 particles with nanoporous gold (NPG) with pore diameters of 10–40 nm. This means that NPG acts as a promoter in the photocatalytic reaction of TiO2. Broadband spectroscopic results from millimeter wave to ultra violet of NPG membrane are discussed to estimate plasmonic effect on the catalysis.

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Prabahar, A. Elphine, B. Thangabalan, R. Kalaichelvi, and P. Vijayaraj Kumar. "UV Spectrophotometric Estimation of Acipimox inBulk and Capsule Dosage Form." E-Journal of Chemistry 6, no. 4 (2009): 1117–20. http://dx.doi.org/10.1155/2009/790531.

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A new simple, rapid, accurate, sensitive and precise spectrophotometric method in ultra violet region has been developed for determination of acipimox (ACX) in bulk and capsule dosage form. Acipimox exhibited maximum absorbance at 231 nm with apparent molar absorptivity of 1.5104 × 104in distilled water. Beer’s law was found to be obeyed in the concentration range 1-10 μg mL-1. Correlation coefficient was found to be 0.9998. The developed method was validated respect to linearity, precision, accuracy. The proposed method is useful for the routine estimation of ACX in bulk and capsule dosage form.

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Harfadli, M. Ma’arij. "Pengaruh Jumlah Sinar Ultra Violet Terhadap Penurunan Kandungan Bahan Organik di Dalam Pengolahan Air Gambut yang Dilanjutkan dengan Saringan Pasir Lambat." SPECTA Journal of Technology 1, no. 2 (November 27, 2019): 21–24. http://dx.doi.org/10.35718/specta.v1i2.77.

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One of the areas with a complicated drinking are the areas with peat soil. This area has a lot water source, one of treatments for peat water is variation in using the UV light for peat water processing.There is reactors in this research: the UV reactor is made of glass with a 6 liters of reactor volume. The reactor contains 15 watts of 3 ultra violet UV lamps. Processing raw water is done in batch and reactor continuously. The wavelength is 370 nm which initial absorbance value of 2.045. The optimum time occurs 30 minutes in 3 lamp of UV irradiation with the elimination of organic matters of 36 mg / l.73%.

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Omiya, Masaki, Hirotsugu Inoue, Kikuo Kishimoto, Masaaki Yanaka, and Noritaka Ihashi. "UV-Irradiation Effects on Interfacial Strength between Thin Ceramic Film and Polymer Substrate." Key Engineering Materials 297-300 (November 2005): 2284–89. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.2284.

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This aim of this study is to investigate the effect of UV (Ultra Violet ray) irradiation on the interfacial adhesion strength between thin ceramic films and polymer substrate. Electric conductive films based on polymer substrates have attracted attention for use in flexible optoelectronic devices. It is well known that the mechanical properties of polymeric materials are degraded by UV irradiation. Therefore, it is considered that the UV irradiation also affects the interfacial adhesion strength between ceramic coating and polymer substrate. The interfacial adhesion strength was measured by Multi-stages peel test. The results show that the interfacial strength decreases with UV irradiation. However, if a filter layer is installed between ceramic and polymer substrate, the degradation ratio becomes small.

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Donard, A., A. C. Pottin, F. Pointurier, and C. Pécheyran. "Determination of relative rare earth element distributions in very small quantities of uranium ore concentrates using femtosecond UV laser ablation – SF-ICP-MS coupling." Journal of Analytical Atomic Spectrometry 30, no. 12 (2015): 2420–28. http://dx.doi.org/10.1039/c5ja00309a.

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An alternative analytical method has been developed to determine lanthanide distribution using hundreds of nanograms of uranium ore concentrates by femtosecond ultra-violet laser ablation coupled to inductively coupled plasma sector-field mass spectrometry.

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Yarn, Kao Feng, Wen Chung Chang, and I. Ting Hsieh. "UV LEDs with Low Dislocation GaN Buffer Layers Grown by MOCVD." Advanced Materials Research 459 (January 2012): 63–66. http://dx.doi.org/10.4028/www.scientific.net/amr.459.63.

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New MOCVD grown UV (ultra-violet) LEDs using low dislocation density GaN buffer layers on sapphire have been studied. Two different LED characteristics of GaN substrates, i.e. 5um-thick and 20um-thick buffer layers, on sapphire are compared with each other. The enhanced LED characteristics show ~29.5% reduction in current-voltage resistance, ~8.5% reduction in turn-on voltage and output power saturation at higher current. Better GaN buffer quality and heat dissipation due to the lower defect density are believed to the enhanced reason.

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Makarov, Yuri N., T. Yu Chemekova, O. V. Avdeev, N. Mokhov, S. S. Nagalyuk, M. G. Ramm, and Heikki Helava. "AlN Substrates and Epitaxy Results." Materials Science Forum 645-648 (April 2010): 1183–86. http://dx.doi.org/10.4028/www.scientific.net/msf.645-648.1183.

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AlN substrates are produced by Physical Vapor Transport (PVT) growth of AlN bulk single crystals followed by post growth processing of the crystals (calibration, slicing, lapping, and polishing). The AlN substrates are suitable for epitaxial growth. The substrates may be used for development of devices such as ultra violet (UV) light emitting diodes (LEDs) and laser diodes (LDs), Piezo-Electric Transducers, SAW devices, RF Transistors, etc.

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Vallikkodi, M., and S. Sudhahar. "The non-linear optical crystal growth and characterization of piperizantum p- aminobentzone." BIBECHANA 16 (November 22, 2018): 15–22. http://dx.doi.org/10.3126/bibechana.v16i0.19875.

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The nonlinear optical properties of piperizanium p – aminobenzoate (PZPAB) crystal were successfully grown with the help of temperature gradient (Slow evaporation) method. The good quality of PZPAB single crystal is formed. The PZPAB is characterized with the help of X-ray diffraction (XRD), Fourier transform infrared (FTIR) measurement, photoluminescence (PL), Raman spectroscopy, ultra violet visible spectroscopy (UV) and finally etching analysis was done.BIBECHANA 6 (2019) 5-22

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