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Journal articles on the topic 'Dispersion. Ultraviolet radiation'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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1

Gouveia, Glauce Ribeiro, Thais Martins Lopes, Carla Amorim Neves, Luiz Eduardo Maia Nery, and Gilma Santos Trindade. "Ultraviolet Radiation Induces Dose-Dependent Pigment Dispersion in Crustacean Chromatophores." Pigment Cell Research 17, no. 5 (2004): 545–48. http://dx.doi.org/10.1111/j.1600-0749.2004.00191.x.

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Wang, Xiaofan, Chao Feng, Tao Liu, et al. "Angular dispersion enhanced prebunch for seeding ultrashort and coherent EUV and soft X-ray free-electron laser in storage rings." Journal of Synchrotron Radiation 26, no. 3 (2019): 677–84. http://dx.doi.org/10.1107/s1600577519002674.

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Prebunching is an effective technique to reduce the radiation saturation length and to improve the longitudinal coherence and output stability in storage-ring-based free-electron lasers (FELs). A novel technique is proposed which uses angular dispersion to enhance the high-harmonic bunching with very small laser-induced energy spread. This technique can effectively reduce the radiation saturation length without significantly reducing the peak power of the FEL. Numerical simulations demonstrate that this technique can be used for the generation of 100 MW scale level, fully temporal coherent fem

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Du Preez, David Jean, Hassan Bencherif, Nelson Bègue, Lieven Clarisse, Rebecca F. Hoffman, and Caradee Yael Wright. "Investigating the Large-Scale Transport of a Volcanic Plume and the Impact on a Secondary Site." Atmosphere 11, no. 5 (2020): 548. http://dx.doi.org/10.3390/atmos11050548.

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Volcanic plumes can be transported across vast distances and can have an impact on solar ultraviolet radiation (UVR) reaching the surface due to the scattering and absorption caused by aerosols. The dispersion of the volcanic plume from the Puyehue-Cordón Caulle volcanic complex (PCCVC) eruption was investigated to determine the effect on aerosol loading at Cape Point, South Africa. The eruption occurred on 4 June 2011 and resulted in a plume reaching a height of between 9 and 12 km and was dispersed across the Southern Hemisphere. Satellite sulphur dioxide (SO2) observations and a dispersion

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Kang, Bin, Shu-Quan Chang, Hao Sun, Yao-Dong Dai та Da Chen. "γ-Radiation Synthesis and Properties of Superparamagnetic CS-ZnSe:Mn Nanocrystals for Biological Labeling". Journal of Nanoscience and Nanotechnology 8, № 8 (2008): 3857–63. http://dx.doi.org/10.1166/jnn.2008.174.

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Chitosan coated ZnSe:Mn (CS-ZnSe:Mn) nanocrystals were successfully synthesized in aqueous system through a γ-radiation route at room temperature under ambient pressure. The structure and properties of nanocrystals were investigated with transmission electron microscope (TEM), fourier transform infrared spectrometer (FT-IR), ultraviolet-visible (UV-vis) spectrometer, photoluminescence emission (PL) spectra, X-ray Diffraction (XRD) and energy dispersion spectrum (EDS). Results showed that the diameter of these nanocrystals was about 4 nm with narrow size distribution. With the increase of doped

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Leenson, I. A., J. Beckman, A. A. Krutikova, and A. A. Ischenko. "Sun Protective Means: The Characteristics and Action Efficiency." Materials Science Forum 757 (May 2013): 25–68. http://dx.doi.org/10.4028/www.scientific.net/msf.757.25.

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Modern sun protective means (SPM) represent complex compositions of substances which provide effective protection of a person’s skin against sunlight. Organic and inorganic sun protective filters (sunscreens) or combinations of them are used as the active components of SPM. Organic sunscreens absorb ultraviolet radiation due to the presence of chromophores in their structure; while action of inorganic sunscreens is based on physical mechanism of protection, such as dispersion, absorption and reflection of ultraviolet (UV) radiation by inorganic particles. Silicon nanocrystals have attracted in

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Dechnarong, Nattanee, Adun Nimpaiboon, and Jitladda Sakdapipanich. "Improvement of Filler-Rubber Interaction by Grafting of Acrylamide onto Saponified Natural Rubber under Ultraviolet Radiation as a Continuous Process." Key Engineering Materials 659 (August 2015): 414–17. http://dx.doi.org/10.4028/www.scientific.net/kem.659.414.

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Silica and carbon black have been widely used as the main reinforcing fillers for improving the properties of natural rubber (NR). In a silica-filled rubber compound, it is known that the low compatibility between NR and silica affects the mechanical properties of rubber products. In order to overcome this drawback, the functionalized saponified NR (FSPNR) was carried out by grafting acrylamide (AM) onto the saponified NR (SPNR) under UV radiation as a continuous process. An increasing in the bound rubber content and Mooney viscosity was found as an increasing AM content. Storage modulus at lo

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Стадник, В. И., Р. Б. Матвиив, П. А. Щепанский, М. Я. Рудиш та З. А. Когут. "Фотоупругие свойства кристаллов сульфата калия". Физика твердого тела 61, № 11 (2019): 2154. http://dx.doi.org/10.21883/ftt.2019.11.48421.529.

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The spectral dependences of the absolute piezo-optic coefficients of potassium sulfate crystals are studied and their insignificant dispersion dependence is established. The matrix of elasto-optic coefficients рin of these crystals is filled using the values of elastic stiffness coefficients and absolute piezo-optic coefficients. The coefficient of the acousto-optic efficiency М2 is estimated and it is shown that, considering the highest values, it is more than an order of magnitude higher than that of quartz and strontium borate crystals. Taking into account the short-wavelength boundary of t

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Prata, A. J., S. A. Carn, A. Stohl, and J. Kerkmann. "Long range transport and fate of a stratospheric volcanic cloud from Soufrière Hills volcano, Montserrat." Atmospheric Chemistry and Physics 7, no. 19 (2007): 5093–103. http://dx.doi.org/10.5194/acp-7-5093-2007.

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Abstract. Volcanic eruptions emit gases, ash particles and hydrometeors into the atmosphere, occasionally reaching heights of 20 km or more, to reside in the stratospheric overworld where they affect the radiative balance of the atmosphere and the Earth's climate. Here we use satellite measurements and a Lagrangian particle dispersion model to determine the mass loadings, vertical penetration, horizontal extent, dispersion and transport of volcanic gases and particles in the stratosphere from the volcanic cloud emitted during the 20 May 2006 eruption of Soufrière Hills volcano, Montserrat, Wes

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Prata, A. J., S. A. Carn, A. Stohl, and J. Kerkmann. "Long range transport and fate of a stratospheric volcanic cloud from Soufriere Hills volcano, Montserrat." Atmospheric Chemistry and Physics Discussions 7, no. 2 (2007): 4657–72. http://dx.doi.org/10.5194/acpd-7-4657-2007.

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Abstract. Volcanic eruptions emit gases, ash particles and hydrometeors into the atmosphere, occasionally reaching great heights to reside in the stratospheric overworld where they affect the radiative balance of the atmosphere and the earth's climate. Here we use satellite measurements and a Lagrangian particle dispersion model to determine the mass loadings, vertical penetration, horizontal extent, dispersion and transport of volcanic gases and particles in the stratosphere from the volcanic cloud emitted during the 20 May 2006 eruption of Soufriere Hills volcano, Montserrat, West Indies. In

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H, Abbas, M. M. El-Tonsy, and Aqeel Abdul jalil Ali Shumis. "Degradation of glass polymers due to successive exposure to acid rain and UV radiation." JOURNAL OF ADVANCES IN PHYSICS 11, no. 2 (2015): 2979–89. http://dx.doi.org/10.24297/jap.v11i2.530.

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Utilization of polymer products for outdoor applications is continuously increasing. So the stability of polymers against environmental degradation became top of interests for many researchers. The effect of environmental elements on the polymers stability has been studied, but individually. A solution against an environmental element may conflict with a solution against other element. Therefore current study aimed to clarify a sort of these conflicts. Polymethylmethacrylate (PMMA) films as example of glassy polymers are exposed to acid rains and Ultraviolet (UV) radiation in sequenced method

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Liu, Xin Hua, Xu Chen Tao, and Er Yan Chi. "Preparation and Application of Modified Nano-Titanium Dioxide Agent." Advanced Materials Research 441 (January 2012): 426–30. http://dx.doi.org/10.4028/www.scientific.net/amr.441.426.

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Cotton is the most widely used fiber. However, cotton fabric has a relatively high UV radiation permeability. Compared with some synthetic fabrics, cotton fabrics anti-UV ability is lower. nanotitanium dioxide has a good catalytic and ultraviolet light shielding effect, so it can be used as anti UV finishing agent. Using modified nanotitanium dioxide to finish the cotton fabrics, one can get the function of anti-UV performance. Therefore, in this paper, nanotitanium dioxide was first modified with 1,6-hexamethylene diisocyanate and polyethylene glycol in order to improve their size stability.

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Liu, Zhu Bo, Xiao Hong Jiang, Bing Zhou, et al. "The Feature of Laser Deposition of Polymeric Composite Films from an Active Gas Phase." Key Engineering Materials 480-481 (June 2011): 30–35. http://dx.doi.org/10.4028/www.scientific.net/kem.480-481.30.

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The organic-silicon films, polytetrafluorethylene (PTFE) films and its composite films with copper have been fabricated from an active gas phase by pulse laser dispersion from initial powder species. The features of all films obtained were studied with the application of attenuated total reﬂection-Fourier transform infrared (ATR-FTIR) spectroscopy. Our results suggest that the wavelength of laser radiation impact a strong effect on the molecular structure of all films. Specifically, the peaks corresponding to the detachment of C-H bonds in the organic-silicon films and its Cu doped films at a

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Yang, Xiaofeng, Lei Zhang, Zhiping Chen, Hongxia Jing, Yuzhe Chen, and Qiaoling Li. "Synthesis of magnetic photocatalyst and sensitization properties of polypyrrole." Science and Engineering of Composite Materials 23, no. 3 (2016): 269–75. http://dx.doi.org/10.1515/secm-2014-0035.

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AbstractIn order to solve the difficulty of separation and recycling of TiO2 and its lower utilization of solar radiation, a new type of TiO2 photocatalyst, which was sensitized by polypyrrole (PPy) and carried by self-made modified Fe3O4, named PPy-TiO2/M-Fe3O4, was fabricated successfully by combining suspension dispersion and in situ polymerization. The structure of photocatalyst and Fe3O4 was characterized using X-ray diffraction, the Fourier transmission infrared spectrometer, and scanning electron microscopy. Light response property was tested by ultraviolet-visible diffuse reflectance s

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Patzer, Michael, Nils Nöthling, Richard Goddard та Christian W. Lehmann. "Absolute Configuration of In Situ Crystallized (+)-γ-Decalactone". Chemistry 3, № 2 (2021): 578–84. http://dx.doi.org/10.3390/chemistry3020040.

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Knowledge about the absolute configuration of small bioactive organic molecules is essential in pharmaceutical research because enantiomers can exhibit considerably different effects on living organisms. X-ray crystallography enables chemists to determine the absolute configuration of an enantiopure compound due to anomalous dispersion. Here, we present the determination of the absolute configuration of the flavoring agent (+)-γ-decalactone, which is liquid under ambient conditions. Single crystals were grown from the liquid in a glass capillary by in situ cryo-crystallization. Diffraction dat

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Ponce-Donoso, Mauricio, Oscar Vallejos-Barra, Benjamin Ingram, and Gustavo Daniluk-Mosquera. "Urban Trees and Environmental Variables: Relationships in a City of Central Chile." Arboriculture & Urban Forestry 46, no. 2 (2020): 84–95. http://dx.doi.org/10.48044/jauf.2020.007.

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We identified relationships between ecosystem services provided by trees and environmental variables, including temperature (°C at ground level and 1.5 m), relative humidity (%), particulate matter (PM10, maximum and average), noise (dBA), and ultraviolet radiation (UV at 1.5 m). This study was carried out in Talca, Chile, a mid-sized city. Measurement locations were selected in three areas based along three main avenues in the center of the city during three different seasons and three different schedules of day, generating 15,515 data in total. In circular plots, with 8 meter radiuses, measu

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Zhang, Zhi Qing, Jian Feng Huang, Li Yun Cao, and Jian Peng Wu. "Influence of Microwave-Hydrothermal Temperature on Synthesis of TiO₂ Thin Films on PMMA Substrates from Colloidal Anatase Aqueous Solutions." Key Engineering Materials 512-515 (June 2012): 1682–85. http://dx.doi.org/10.4028/www.scientific.net/kem.512-515.1682.

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Nanocrystalline TiO2 films were deposited on polymethylmethacrylate (PMMA) substrates by dip–coating process from colloidal anatase aqueous solutions. Microwave–hydrothermal process treating TiO2 colloidal solutions was applied to enhance crystallization under a mild condition and avoid post–treatment. The as–prepared TiO2 films were characterized and analysed by X–ray diffraction (XRD), UV–visible spectroscopy and atomic force microscopy (AFM). The photocatalytic degradation of Rhodamine B (RhB) under ultraviolet radiation was explored. Results show that pure anatase TiO2 is achieved rapidly

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Wu, Xiangji, Weihong Gao, Xiaohong Shen, Wei Liu, and Weiping Du. "Preparation and characterization of Taichi masterbatch/polyester functional composite fiber." Textile Research Journal 90, no. 7-8 (2019): 731–43. http://dx.doi.org/10.1177/0040517519878796.

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As a natural ore, Taichi stone brings potential market value and social value due to its health-care functions, such as releasing far-infrared and anti-ultraviolet (anti-UV) and anti-bacterial functions. In this study, Tachi masterbatch (containing 10% Tachi nanoparticles)/polyester (PET) functional composite fiber was prepared by electro-spinning. To study the effect of nanoparticle content on the composite fibers, five spinning solutions with different nanoparticle contents were mixed and electrospun. The spun fibers were then characterized by using scanning electron microscopy, Fourier tran

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Müller, Frank A., Heinz Dieter Kurland, and Janet Grabow. "Nanoparticles for Biomedical Applications Prepared by CO₂ Laser Vaporization." Key Engineering Materials 587 (November 2013): 154–59. http://dx.doi.org/10.4028/www.scientific.net/kem.587.154.

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Functional ceramic nanopowders with emphasis on biomedical applications were engineered by gas-phase condensation using the CO2 laser vaporization (LAVA) technique. Europium doped strontium aluminate nanoparticles (NP) were prepared from a SrO/α-Al2O3/Eu2O3 powder mixture. Excited with ultraviolet radiation (UV), the as-prepared amorphous NP revealed red photoluminescence emission. After annealing in reductive atmosphere crystalline SrAl2O4:Eu2+ nanopowder was obtained showing strong green emission at UV excitation. Ferrimagnetic iron oxide (FexOy) nanopowders were prepared starting from α-Fe2

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Du, T. Z., C. H. Liu, and Y. B. Zhao. "Large-eddy simulation of pollutant dispersion from a ground-level area source over urban street canyons with irreversible chemical reactions." Advances in Science and Research 11, no. 1 (2014): 89–91. http://dx.doi.org/10.5194/asr-11-89-2014.

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Abstract. In this study, the dispersion of chemically reactive pollutants is calculated by large-eddy simulation (LES) in a neutrally stratified urban canopy layer (UCL) over urban areas. As a pilot attempt, idealized street canyons of unity building-height-to-street-width (aspect) ratio are used. Nitric oxide (NO) is emitted from the ground surface of the first street canyon into the domain doped with ozone (O3). In the absence of ultraviolet radiation, this irreversible chemistry produces nitrogen dioxide (NO2), developing a reactive plume over the rough urban surface. A range of timescales

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Kamalian, Parisa, Saied Nouri Khorasani, Amir Abdolmaleki, et al. "Toward the development of polyethylene photocatalytic degradation." Journal of Polymer Engineering 40, no. 2 (2020): 181–91. http://dx.doi.org/10.1515/polyeng-2019-0230.

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AbstractIn this research, the photocatalytic degradation performance in a commercial low-density polyethylene (LDPE) film was investigated in the presence of zinc oxide (ZnO) nanoparticles grafted with two amounts of polyacrylamide. Fourier-transform infrared spectroscopy (FTIR) besides thermogravimetric analysis (TGA) test results reinforced the successful grafting of polyacrylamide to the extent of 10 and 39 wt.% on the ZnO nanoparticles. The photocatalytic degradation of the films under ultraviolet (UV) radiation was evaluated by characterizing the mechanical properties, weight loss, and mo

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Saatsakis, G., C. Michail, C. Fountzoula, et al. "Fabrication and Luminescent Properties of Zn–Cu–In–S/ZnS Quantum Dot Films under UV Excitation." Applied Sciences 9, no. 11 (2019): 2367. http://dx.doi.org/10.3390/app9112367.

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Quantum dots (QDs) are quite interesting materials due to their unique chemical and physical properties. ZnCuInS/ZnS QDs can be produced either in hydrophobic or hydrophilic form, are non-toxic, and thus favorable for studies in the area of biology. Poly(methyl methacrylate) (PMMA) is a well-known biocompatible resin which is widely used in dentistry, ophthalmology, and orthopedic surgery. Four composite PMMA films of ZnCuInS/ZnS nanocrystals with maximum emission at 530 nm and concentrations of 1.0, 4.0, 6.0, and 10.0 %w/v, were prepared. X-ray irradiation was used to evaluate the volume homo

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Biednov, Mykola, Günter Brenner, Benjamin Dicke, et al. "Alignment of the aberration-free XUV Raman spectrometer at FLASH." Journal of Synchrotron Radiation 26, no. 1 (2019): 18–27. http://dx.doi.org/10.1107/s160057751801576x.

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An extreme-ultraviolet (XUV) double-stage Raman spectrometer is permanently installed as an experimental end-station at the PG1 beamline of the soft X-ray/XUV free-electron laser in Hamburg, FLASH. The monochromator stages are designed according to the Czerny–Turner optical scheme, adapted for the XUV photon energy range, with optical elements installed at grazing-incidence angles. Such an optical scheme along with the usage of off-axis parabolic mirrors for light collimation and focusing allows for aberration-free spectral imaging on the optical axis. Combining the two monochromators in addit

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Esmaeildoost, N., and S. Jafari. "Effects of beam temperature and plasma frequency on the radiation growth rate of a FEL with a laser wiggler." Laser and Particle Beams 35, no. 2 (2017): 241–51. http://dx.doi.org/10.1017/s0263034617000118.

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AbstractA linearly polarized laser pulse has been employed as a wiggler in a free-electron laser (FEL) in the presence of a plasma background for generating short wavelength radiation down to the extreme ultraviolet ray and X-ray spectral regions. Introducing plasma background in the FEL interaction region would lessen the beam energy requirement and also enhance both the beam current and the electron-bunching process. This configuration affords the possibility of scaling the device to more compact FELs and would have a higher tunability by changing the plasma density and the temperature of th

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LÖBUS, S., R. COURTHS, S. HALILOV, H. GOLLISCH, and R. FEDER. "BULK AND SURFACE ELECTRONIC STATES OF ORDERED Cu3Au(001): AN ANGLE-RESOLVED PHOTOEMISSION INVESTIGATION." Surface Review and Letters 03, no. 05n06 (1996): 1749–61. http://dx.doi.org/10.1142/s0218625x96002680.

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We have performed an angle-resolved ultraviolet photoemission spectroscopy (ARUPS) investigation of ordered Cu 3Au(001) at room temperature using He resonance and synchrotron radiation. The positions of upper Cu -like bulk bands near the center Γ of the bulk Brillouin zone (BZ) and the dispersion of the upper sp band along the A line have been determined using bulk-sensitive photon energies 10 eV≤hν≥15 eV. Except for a downward shift, the calculated bulk bands are in excellent agreement with experiment. Around the centers [Formula: see text] of the surface BZ, we have identified three new surf

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Morosanu, Cezarina, Larisa Popescu-Lipan, Liviu Sacarescu, Andreea-Roxana Fanaru, and Dorina Creanga. "Theoretical modeling and experimental study of sodium oleate properties for wastewater cleaning with magnetic nanoparticles stabilized with oleate." E3S Web of Conferences 247 (2021): 01025. http://dx.doi.org/10.1051/e3sconf/202124701025.

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We present some preliminary results regarding possible reducing of environment phenol contamination with nanotechnology involving. Magnetic nanoparticles stabilized in water dispersion with oleate were prepared for experimental testing of their interaction with wastewater samples containing phenol residues from industrial and sanitation sources. Magnetite with moderate level of cobalt doping was synthesized by co-precipitation method in the form of nanoparticles; further their surface was modified by the reaction with sodium oleate solution. Quantum chemical simulation of oleate structure reco

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Chani, Kulwinder Singh, JS Saini, and H. Bhunia. "Accelerated weathering of bolted joints prepared from woven glass fiber-reinforced nanocomposites." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 233, no. 10 (2019): 2108–25. http://dx.doi.org/10.1177/1464420719828155.

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This work deals with the accelerated aging of the bolted joints prepared from glass fiber-reinforced nanocomposite laminates. ASTM D5961 was used to design the bolted joint, and the geometric parameters, i.e. width-to hole-diameter ( W/ D) ratio and edge distance-to-hole diameter ( E/ D) ratio were fixed to 6 and 5, respectively. ASTM D1544 was used for accelerated aging, and a maximum of 500 h cyclical ultraviolet exposure, 8 h of ultraviolet radiation at 60 ℃ followed by 4 h of condensation at 50 ℃, was given to the specimens. A full factorial design of experiment was conducted on important

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Cai, Qinhong, Baiyu Zhang, Bing Chen, Tong Cao, and Ze Lv. "Biosurfactant produced by a Rhodococcus erythropolis mutant as an oil spill response agent." Water Quality Research Journal 51, no. 2 (2016): 97–105. http://dx.doi.org/10.2166/wqrjc.2016.025.

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Biosurfactants have been considered as superior alternatives to currently used surfactants as they are generally more biodegradable, less toxic, and better at enhancing biodegradation. However, the application of biosurfactants is limited by the availability of economic biosurfactants and the corresponding producers that can work effectively. Hyperproducers generated by metabolic engineering of biosurfactant producers are highly desired to overcome this obstacle. A Rhodococcus erythropolis SB-1A strain was isolated from offshore oily water samples. One of its mutants derived by random mutagene

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Catalano, Riccardo, Jérôme Labille, Daniela Gaglio, et al. "Safety Evaluation of TiO2 Nanoparticle-Based Sunscreen UV Filters on the Development and the Immunological State of the Sea Urchin Paracentrotus lividus." Nanomaterials 10, no. 11 (2020): 2102. http://dx.doi.org/10.3390/nano10112102.

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Sunscreens are emulsions of water and oil that contain filters capable of protecting against the detrimental effects of ultraviolet radiation (UV). The widespread use of cosmetic products based on nanoparticulate UV filters has increased concerns regarding their safety and compatibility with both the environment and human health. In the present work, we evaluated the effects of titanium dioxide nanoparticle (TiO2 NP)-based UV filters with three different surface coatings on the development and immunity of the sea urchin, Paracentrotus lividus. A wide range of NP concentrations was analyzed, co

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Ntohogian, Sonia, Viktoria Gavriliadou, Evi Christodoulou, et al. "Chitosan Nanoparticles with Encapsulated Natural and UF-Purified Annatto and Saffron for the Preparation of UV Protective Cosmetic Emulsions." Molecules 23, no. 9 (2018): 2107. http://dx.doi.org/10.3390/molecules23092107.

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The aim of the present work is to evaluate the preparation of sunscreen emulsions based on chitosan (CS) nanoparticles with annatto, ultrafiltrated (UF) annatto, saffron, and ultrafiltrated saffron. Ionic gelation was used for the preparation of chitosan nanoparticles, while their morphological characteristics and physicochemical properties were evaluated via Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), and dynamic light scattering (DLS). Results showed that the prepared nanoparticles ranged from ~150 to ~500 nm and had a

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Roy, Manami, Biman B. Nath, and G. M. Voit. "A panoramic view of the circumgalactic medium in the photoionized precipitation model." Monthly Notices of the Royal Astronomical Society 507, no. 3 (2021): 3849–59. http://dx.doi.org/10.1093/mnras/stab2407.

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ABSTRACT We consider a model of the circumgalactic medium (CGM) in which feedback maintains a constant ratio of cooling time to free-fall time throughout the halo, so that the entire CGM is marginally unstable to multiphase condensation. This ‘precipitation model’ is motivated by observations of multiphase gas in the cores of galaxy clusters and the haloes of massive ellipticals. From the model, we derive the density and temperature profiles for the CGM around galaxies with masses similar to the Milky Way. After taking into consideration the geometrical position of our Solar system in the Milk

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Figueira, M., A. Zavagno, L. Bronfman, D. Russeil, R. Finger, and F. Schuller. "APEX CO observations towards the photodissociation region of RCW 120." Astronomy & Astrophysics 639 (July 2020): A93. http://dx.doi.org/10.1051/0004-6361/202037713.

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Context. The edges of ionized (H II) regions are important sites for the formation of (high-mass) stars. Indeed, at least 30% of the Galactic high-mass-star formation is observed there. The radiative and compressive impact of the H II region could induce star formation at the border following different mechanisms such as the collect and collapse or the radiation-driven implosion (RDI) models and change their properties. Aims. We aim to study the properties of two zones located in the photo dissociation region (PDR) of the Galactic H II region RCW 120 and discuss them as a function of the physi

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Kylling, Arve, Hamidreza Ardeshiri, Massimo Cassiani, et al. "Can statistics of turbulent tracer dispersion be inferred from camera observations of SO<sub>2</sub> in the ultraviolet? A modelling study." Atmospheric Measurement Techniques 13, no. 6 (2020): 3303–18. http://dx.doi.org/10.5194/amt-13-3303-2020.

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Abstract. Atmospheric turbulence and in particular its effect on tracer dispersion may be measured by cameras sensitive to the absorption of ultraviolet (UV) sunlight by sulfur dioxide (SO2), a gas that can be considered a passive tracer over short transport distances. We present a method to simulate UV camera measurements of SO2 with a 3D Monte Carlo radiative transfer model which takes input from a large eddy simulation (LES) of a SO2 plume released from a point source. From the simulated images the apparent absorbance and various plume density statistics (centre-line position, meandering, a

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Kampf, Anthony R., Jakub Plášil, Anatoly V. Kasatkin, Joe Marty, Jiří Čejka, and Ladislav Lapčák. "Shumwayite, [(UO2)(SO4)(H2O)2]2·H2O, a new uranyl sulfate mineral from Red Canyon, San Juan County, Utah, USA." Mineralogical Magazine 81, no. 2 (2017): 273–85. http://dx.doi.org/10.1180/minmag.2016.080.091.

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AbstractThe new mineral shumwayite (IMA2015-058), [(UO2)(SO4)(H2O)2]2·H2O, was found in the Green Lizard and Giveaway-Simplot mines, White Canyon district, San Juan County, Utah, USA, where it occurs as a secondary alteration phase. At the Green Lizard mine, it is found in association with calcite, gypsum, plášilite, pyrite, rozenite and sulfur; at the Giveaway-Simplot mine, shumwayite is associated with rhomboclase and römerite. The mineral occurs as pale greenish-yellow monoclinic prisms, elongated on [100], up to ∼0.3 mm long and commonly in subparallel to random intergrowths. The mineral i

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Seyam, Abdelfattah Mohamed, Rahul Vallabh, and Ahmed H. Hassanin. "Improving UV Resistance of Fibers: Idealized Computational Model Predicting the Distribution of UV Blocking Cylindrical Nanoparticles in Protective Polymeric Layer." Journal of Engineered Fibers and Fabrics 10, no. 1 (2015): 155892501501000. http://dx.doi.org/10.1177/155892501501000103.

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High strength fibers such as PBO and Kevlar are used to produce composites, bulletproof vests, tendons of giant scientific balloons, and other high performance products. These fibers, however, are known to degrade upon exposure to Ultraviolet (UV) radiation which causes premature failure of the end-products. Improving UV resistance of high strength fibers like PBO through methods such as adding UV inhibiting particles during filament spinning or dyeing/coating process is not only extremely difficult, but often fails to provide the adequate UV protection. As an alternative to conventional appro

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Ingleby, Laura, Nuria Calvet, Jesus Hernández, et al. "EVOLUTION OF X-RAY AND FAR-ULTRAVIOLET DISK-DISPERSING RADIATION FIELDS." Astronomical Journal 141, no. 4 (2011): 127. http://dx.doi.org/10.1088/0004-6256/141/4/127.

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Hawthorne, F. C., M. A. Cooper, Y. A. Abdu, N. A. Ball, M. E. Back, and K. T. Tait. "Davidlloydite, ideally Zn3(AsO4)2(H2O)4, a new arsenate mineral from the Tsumeb mine, Otjikoto (Oshikoto) region, Namibia: description and crystal structure." Mineralogical Magazine 76, no. 1 (2012): 45–57. http://dx.doi.org/10.1180/minmag.2012.076.1.45.

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AbstractDavidlloydite, ideally Zn3(AsO4)2(H2O)4, is a new supergene mineral from the Tsumeb mine, Otjikoto (Oshikoto) region, Namibia. It occurs as elongated prisms (∼10:1 length-to-width ratio) that are flattened on {010}, and up to 100 × 20 × 10 μm in size. The crystals occur as aggregates (up to 500 μm across) of subparallel to slightly diverging prisms lying partly on and partly embedded in fine-grained calcioandyrobertsite. Crystals are prismatic along [001] and flattened on {010}, and show the forms {010} dominant and {100} subsidiary. Davidlloydite is colourless with a white streak and

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Bellomi, E., B. Godard, P. Hennebelle, et al. "3D chemical structure of diffuse turbulent ISM." Astronomy & Astrophysics 643 (October 28, 2020): A36. http://dx.doi.org/10.1051/0004-6361/202038593.

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Context. The amount of data collected by spectrometers from radio to ultraviolet (UV) wavelengths opens a new era where the statistical and chemical information contained in the observations can be used concomitantly to investigate the thermodynamical state and the evolution of the interstellar medium (ISM). Aims. In this paper, we study the statistical properties of the HI-to-H2 transition observed in absorption in the local diffuse and multiphase ISM. Our goal is to identify the physical processes that control the probability of occurrence of any line of sight and the origins of the variatio

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Uvarova, Y. A., E. Sokolova, F. C. Hawthorne, et al. "Noonkanbahite, BaKNaTi2(Si4O12)O2, a new mineral species: description and crystal structure." Mineralogical Magazine 74, no. 3 (2010): 441–50. http://dx.doi.org/10.1180/minmag.2010.074.3.441.

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AbstractNoonkanbahite, ideally BaKNaTi2(Si4O12)O2, is described as a new mineral species. At Liley [Löhley], Eifel Mountains, Germany (the holotype locality), it occurs as sprays of prismatic crystals (up to 8 mm) or single prismatic crystals (up to 4 mm) on walls of cavities in alkaline igneous rocks. At Murun, Siberia, Russia, noonkanbahite forms coarse lamellar crystals up to 0.05 cm × 0.7 cm × 1.5 cm embedded in kalsilite syenite. Noonkanbahite is brittle, H = 6, Dobs. = 3.39(1), Dcalc. = 3.49 g/cm3, has a vitreous lustre and does not fluoresce in ultraviolet light. It has poor cleavage on

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Pánek, Miloš, Eliška Oberhofnerová, Štěpán Hýsek, Přemysl Šedivka, and Aleš Zeidler. "Colour Stabilization of Oak, Spruce, Larch and Douglas Fir Heartwood Treated with Mixtures of Nanoparticle Dispersions and UV-Stabilizers after Exposure to UV and VIS-Radiation." Materials 11, no. 9 (2018): 1653. http://dx.doi.org/10.3390/ma11091653.

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Colour changes and associated wood degradation in exterior and interior applications influenced by ultraviolet (UV) and visible radiation (VIS) decreases the aesthetic value of the products and shortens the overall life of transparent coatings. The aim of the paper is to achieve colour stabilization of oak, larch, Douglas fir and spruce heartwood via surface treatment with UV stabilizers, hindered amine light stabilizers (HALS), nanoparticles TiO2, ZnO, and mixtures thereof, during exposure to UV and VIS radiation. Colour changes were evaluated during accelerated artificial ageing testing in X

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Pautov, Leonid A., Atali A. Agakhanov, Elena Sokolova, et al. "Khvorovite, Pb2+4Ca2[Si8B2(SiB)O28]F, a new hyalotekite-group mineral from the Darai-Pioz alkaline massif, Tajikistan: Description and crystal structure." Mineralogical Magazine 79, no. 4 (2015): 949–63. http://dx.doi.org/10.1180/minmag.2015.079.4.06.

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AbstractKhvorovite, ideally Pb42+Ca2[Si8B2(SiB)O28]F, is a new borosilicate mineral of the hyalotekite group from the Darai-Pioz alkaline massif in the upper reaches of the Darai-Pioz river, Tajikistan. Khvorovite was found in a pectolite aggregate in silexites (quartz-rich rocks). The pectolite aggregate consists mainly of pectolite, quartz and fluorite, with minor aegirine, polylithionite, turkestanite and baratovite; accessory minerals are calcite, pyrochlore-group minerals, reedmergnerite, stillwellite-(Ce), pekovite, zeravshanite, senkevichite, sokolovaite, mendeleevite-(Ce), alamosite, o

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Bashawri, Yasir M., Peter Robins, David M. Cooper, James E. McDonald, Davey L. Jones, and A. Prysor Williams. "Impact of Sediment Concentration on the Survival of Wastewater-Derived blaCTX-M-15-Producing E. coli, and the Implications for Dispersal into Estuarine Waters." International Journal of Environmental Research and Public Health 17, no. 20 (2020): 7608. http://dx.doi.org/10.3390/ijerph17207608.

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The environmental cycling of antibiotic-resistant blaCTX-M-15-producing E. coli following release from wastewater treatment plants is a major public health concern. This study aimed to (i) assess the impact of sediment concentrations on the rate of their inactivation following release from human wastewater into freshwater, and (ii) simulate their subsequent dispersal to the nearby coastline during a “worst-case” event where heavy rainfall coincided with high spring tide in the Conwy Estuary, North Wales. Freshwater microcosms of low, medium and high turbidity were inoculated with blaCTX-M-15-p

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Langer, W. D., J. L. Pineda, P. F. Goldsmith, et al. "The dense warm ionized medium in the inner Galaxy." Astronomy & Astrophysics 651 (July 2021): A59. http://dx.doi.org/10.1051/0004-6361/202040223.

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Context. Ionized interstellar gas is an important component of the interstellar medium and its lifecycle. The recent evidence for a widely distributed highly ionized warm interstellar gas with a density intermediate between the warm ionized medium (WIM) and compact H II regions suggests that there is a major gap in our understanding of the interstellar gas. Aims. Our goal is to investigate the properties of the dense WIM in the Milky Way using spectrally resolved SOFIA GREAT [N II] 205 μm fine-structure lines and Green Bank Telescope hydrogen radio recombination lines (RRL) data, supplemented

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Jain, Rajeev, Rohitashva Mani Tripathi, Archna Negi, and Shishir Pratap Singh. "A simple, cost-effective and rapid method for simultaneous determination of Strychnos nux-vomica alkaloids in blood and Ayurvedic medicines based on ultrasound-assisted dispersive liquid–liquid microextraction–thin-layer chromatography-image analysis." Journal of Chromatographic Science 58, no. 5 (2020): 477–84. http://dx.doi.org/10.1093/chromsci/bmaa007.

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Abstract A simple, rapid, cost-effective and green analytical method is developed based on ultrasound-assisted dispersive liquid–liquid microextraction (US-DLLME) coupled to thin-layer chromatography (TLC)-image analysis for the simultaneous determination of two major alkaloids of Strychnos nux-vomica L i.e., strychnine and brucine. The method is composed of three steps, namely (i) US-DLLME by injecting a mixture of 100-μL chloroform (extraction solvent) and 1-mL methanol (disperser solvent) in 5 mL of aqueous sample, followed by ultrasonication and centrifugation, (ii) TLC of 20 μL of sedimen

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Wevers, Thomas, Nicholas C. Stone, Sjoert van Velzen, et al. "Black hole masses of tidal disruption event host galaxies II." Monthly Notices of the Royal Astronomical Society 487, no. 3 (2019): 4136–52. http://dx.doi.org/10.1093/mnras/stz1602.

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ABSTRACT We present new medium resolution, optical long-slit spectra of a sample of six ultraviolet (UV)/optical and 17 X-ray-selected tidal disruption event candidate host galaxies. We measure emission line ratios from the optical spectra, finding that the large majority of hosts are quiescent galaxies, while those displaying emission lines are generally consistent with star formation dominated environments; only three sources show clear evidence of nuclear activity. We measure bulge velocity dispersions using absorption lines and infer host black hole (BH) masses using the M – σ relation. Wh

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Jenkins, Edward B., and Todd M. Tripp. "New results on the distribution of thermal pressures in the diffuse ISM." Proceedings of the International Astronomical Union 2, S237 (2006): 53–56. http://dx.doi.org/10.1017/s1743921307001214.

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AbstractThe ground electronic state of neutral atomic carbon has three fine-structure levels. In the interstellar medium, the relative populations of the upper two levels are established by collisional excitations (and de-excitations) balanced against spontaneous radiative decay. Consequently, the fractions of C I in the upper two levels indicate acceptable combinations of local temperature and density, which in turn indicate the approximate thermal pressures of the medium. We can measure the values of these fractions and how they vary from one location to the next by observing the multiplets

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Katangur, Phaneshwar, Steven B. Warner, Prabir K. Patra, Yong K. Kim, Shamal K. Mhetre, and Autumn Dhanote. "Nano-Structured Polymer Coatings for Ultraviolet Protection." MRS Proceedings 788 (2003). http://dx.doi.org/10.1557/proc-788-l8.44.

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ABSTRACTPolymer materials such as Kevlar that are susceptible to UV degradation may be protected by appropriate coatings. We are using zinc oxide and titanium dioxide nanoparticles with an average particle size ranging from 25 to 70 nm. Five weight percent nanoparticles were dispersed in acrylic coatings, the dispersion is assisted by addition of a non-ionic surfactant, mechanical stirring and ultrasonication. The UV protective mechanism of nanoparticle-embedded coatings is theoretically explained using Mie theory. We estimated the minimum thickness of a 5 weight % nanoparticle-embedded coatin

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Chambers, David Keith, and Sandra Selmic. "Advanced Characterization of the Electronic Structure of MEH-PPV." MRS Proceedings 871 (2005). http://dx.doi.org/10.1557/proc-871-i6.20.

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AbstractIn this paper, we present research results that explore the basic molecular structure, orientation, and electrical properties of the conjugated polymer poly(2-methoxy-5- (2,9-ethyl-hexyloxy)-1,4-phenylenevinylene) (MEH-PPV). The bandgap structure of MEH-PPV was investigated through optical absorption and emission spectra, and ultraviolet photoemission spectroscopy (UPS). Based on the optical absorption of MEH-PPV, the π-π* bandgap energy is 2.14eV. The emission spectrum of ITO/MEH-PPV/Al light emitting diode has a peak at 590nm in wavelength which corresponds to photon energies of 2.1e

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González Navarrete, Julio César, and Julián Salamanca. "Absorción por ozono y dispersión por aire de la radiación solar ultravioleta B." Revista U.D.C.A Actualidad & Divulgación Científica 14, no. 2 (2011). http://dx.doi.org/10.31910/rudca.v14.n2.2011.792.

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SILVA, LILIANE Aparecida, Adriana Batistab, Jefferson Nascimentoc, Clascidia Furtadoc, and Luiz Faria. "Investigation of polymer-based BaO and rGO nanocomposites for application in low energy X ray attenuation." Brazilian Journal of Radiation Sciences 7, no. 2B (2019). http://dx.doi.org/10.15392/bjrs.v7i2b.431.

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Polymeric materials can serve as a matrix for the dispersion of nanomaterials with good attenuation features, resulting in lightweight, conformable, flexible, lead-free and easy-to-process materials. Thus, some well-known radiation shielding materials could be used in low proportion as a filler, for the formation of new materials. On the other hand, nanostructured carbon materials, such as graphene oxide (GO) have been reported recently to show enhanced attenuation properties. For the present work, poly(vinylidene fluoride) [PVDF] homopolymers and its fluorinated copolymers were filled with me

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Hondovska, Anna Serhiivna, Roman Ihorovych Didus, Vladyslav Anatoliiovych Lapshuda, and Olha Vasylivna Yashchenko. "Deposition of Molybdenum Oxide Thin Films for Flexible Biodegradable Electronics." Electronic and Acoustic Engineering 4, no. 1 (2021). http://dx.doi.org/10.20535/2617-0965.eae.227276.

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With its unprecedented properties over conventional rigid platforms, flexible electronics have been a significant research topic in the last decade, offering a broad range of applications from bendable display, flexible solarenergy systems, to soft implantable-devices for health monitoring. Flexible electronics is a disruptive science that requires a high level of multi-disciplinary research, including chemistry, physics, material science, electronic and electrical engineering, mechanical engineering, computing science, biomedical engineering. The deep cross-integrate of it with other key subj

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