Zeitschriftenartikel: „Reactive light“

1

SHIBUE, Kazuhisa. „Reactive sintering of light intermetallics.“ Journal of Japan Institute of Light Metals 44, Nr. 11 (1994): 614–21. http://dx.doi.org/10.2464/jilm.44.614.

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Szuromi, Phil. „Light frees a reactive thiol“. Science 372, Nr. 6545 (27.05.2021): 930.7–931. http://dx.doi.org/10.1126/science.372.6545.930-g.

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3

&NA;. „New light on acute reactive arthritis“. Inpharma Weekly &NA;, Nr. 987 (Mai 1995): 11. http://dx.doi.org/10.2165/00128413-199509870-00023.

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4

Huang, Kai Jin, Yu Yao Nie und Yun Liu. „Visible Light Photocatalytic Degradation of Reactive Deep Blue K-R by BiOI and BiOCl_0.2Br_0.1I_0.7“. Applied Mechanics and Materials 217-219 (November 2012): 1186–90. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.1186.

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The visible-light photocatalytic degradation of an azo dye Reactive Deep Blue K-R by BiOI and BiOCl0.2Br0.1I0.7photocatalysts was investigated. When the reaction proceeded for 1 h under the conditions of 15mg/l Reactive Deep Blue K-R solution and PH=3, the visible-light degradation degrees of Reactive Deep Blue K-R were 93% and 52% for BiOCl0.2Br0.1I0.7and BiOI, respectively.Moreover, the photodegradation of Reactive Deep Blue K-R by BiOI and BiOCl0.2Br0.1I0.7followed a first-order reaction kinetic and the values of k for BiOI and BiOCl0.2Br0.1I0.7are 0.911h-1 and 1.981h-1, respectively. BiOCl0.2Br0.1I0.7exhibits better visible-light-responsive photocatalytic performance for photodegradation of Reactive Deep Blue K-R than BiOI due to the smaller particle size, the larger specific surface area and the stronger redox potential of BiOCl0.2Br0.1I0.7.

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Gericke, Karl-Heinz, Christoph Kreher und Jan Leo Rinnenthal. „Stereocontrol of Reactive Encounters Using Polarized Light“. Journal of Physical Chemistry A 101, Nr. 41 (Oktober 1997): 7530–33. http://dx.doi.org/10.1021/jp971015v.

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6

Robin, Degrave, Cockx Arnaud und Schmitz Philippe. „Model of Reactive Transport within a Light Photocatalytic Textile“. International Journal of Chemical Reactor Engineering 14, Nr. 1 (01.02.2016): 269–81. http://dx.doi.org/10.1515/ijcre-2015-0060.

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AbstractThis paper deals with the 3D-modeling of the reactive transport within a light photocatalytic textile used to decontaminate industrial effluents. The model consists of the coupling of fluid flow governing equations, species convection diffusion equations and a heterogeneous reaction equation. It is solved numerically on a Representative Volume Element (RVE) of the textile, i.e. at the microscopic scale regarding the industrial photocatalytic reactor using Comsol Multiphysics software. In a preliminary approach, the reactive transport model was first applied in a 2D simple geometry to verify its accuracy in terms of mass balance of the species. Then successive simulations using pseudo-periodic boundary conditions were performed in the RVE and the depollution efficiency along the textile length is analysed in terms of pollutant concentration. A sensitivity analysis was done to reveal the relative importance of the kinetic and hydrodynamic parameters in prediction of pollutant concentration fields in the RVE. It was found that a high adsorption rate associated with a low permeable fabric maximizes the amount of treated fluid. Finally the performances of a typical reactor composed of a stack of textiles were investigated. Results show a significant improvement of depollution efficiency of this particular configuration compared to single textiles in parallel.

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Sadrekarimi, Abouzar. „Development of a Light Weight Reactive Powder Concrete“. Journal of Advanced Concrete Technology 2, Nr. 3 (2004): 409–17. http://dx.doi.org/10.3151/jact.2.409.

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Lin, Jiang-Jen, Michael Cuscurida und Harold G. Waddill. „Reactive Tetramethylpiperidine-Containing Poly(oxypropylenediamines) as Light Stabilizers“. Industrial & Engineering Chemistry Research 36, Nr. 5 (Mai 1997): 1944–47. http://dx.doi.org/10.1021/ie960521o.

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MILLARD, P. R., E. YOUNG, D. E. HARRISON und F. WOJNAROWSKA. „Reactive perforating collagenosis: light, ultrastructural and immunohistological studies“. Histopathology 10, Nr. 10 (Oktober 1986): 1047–56. http://dx.doi.org/10.1111/j.1365-2559.1986.tb02541.x.

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Seshadri, S. R. „Reactive power in the full Gaussian light wave“. Journal of the Optical Society of America A 26, Nr. 11 (26.10.2009): 2427. http://dx.doi.org/10.1364/josaa.26.002427.

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Jardine, A. B., K. J. Jardine, J. D. Fuentes, S. T. Martin, G. Martins, F. Durgante, V. Carneiro, N. Higuchi, A. O. Manzi und J. Q. Chambers. „Highly reactive light‐dependent monoterpenes in the Amazon“. Geophysical Research Letters 42, Nr. 5 (06.03.2015): 1576–83. http://dx.doi.org/10.1002/2014gl062573.

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Heck, Diane E., Anna M. Vetrano, Thomas M. Mariano und Jeffrey D. Laskin. „UVB Light Stimulates Production of Reactive Oxygen Species“. Journal of Biological Chemistry 278, Nr. 25 (01.05.2003): 22432–36. http://dx.doi.org/10.1074/jbc.c300048200.

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13

Xiao, Tiebo, Mingjing Mei, Yuwei He und Lei Zhou. „Blue light-promoted cross-coupling of aryldiazoacetates and diazocarbonyl compounds“. Chemical Communications 54, Nr. 64 (2018): 8865–68. http://dx.doi.org/10.1039/c8cc04609c.

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A blue light-promoted cross-coupling of two distinct diazo compounds was described. The reaction producesE-configured trisubstituted alkenes in good yields in the absence of catalysts and additives. The reactive free carbene intermediates were generatedviaselective photolysis of one of the two diazo compounds upon blue light irradiation.

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Jia, Yumei, Liyuan Zhang, Kai Liu, Ruoyang Chen, Caiqian Zhang, Juliang Yin, Wei Shen und Jinxin He. „Effects of the perspiration on the photo-fading of reactive dyes“. Textile Research Journal 89, Nr. 5 (05.02.2018): 688–97. http://dx.doi.org/10.1177/0040517517753639.

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In this paper, we aim to study the effects of artificial sweat components on the photo-fading of reactive dyes on cotton fabrics. Two standards of artificial perspiration were tested according to the Japanese Industrial Standard (JIS L 0888 standard) and the Association for Textile Technical Study (ATTS standard), respectively. The light and perspiration stability of reactive dyes was characterized using the color difference value (DE). Standard orthogonal experiments were designed to study the influences of each artificial sweat component and the interaction between these components on the photo-fading reaction of the selected reactive dyes. The results indicated that L-histidine monohydrochloride monohydrate (0.5 g/L) was the dominant influencing factor on the light and perspiration stability of the reactive dyes exposing under both standards of artificial perspiration. In the JIS L 0888 standard, sodium chloride (5.0 g/L) played the significant role in the photo-fading reaction of the reactive dyes, while the influences caused by other components could be neglected. In the ATTS standard, sodium chloride (5.0 g/L), DL-aspartic acid (0.5 g/L) and glucose (5.0 g/L) aggravated the photo-fading of the selected reactive dyes.

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Oliver, Jon L., und Robert W. Meyers. „Reliability and Generality of Measures of Acceleration, Planned Agility, and Reactive Agility“. International Journal of Sports Physiology and Performance 4, Nr. 3 (September 2009): 345–54. http://dx.doi.org/10.1123/ijspp.4.3.345.

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Purpose:The purpose of the current study was to assess the reliability of a new protocol that examines different components of agility using commercially available timing gates.Methods:Seventeen physically active males completed four trials of a new protocol, which consisted of a number of 10-m sprints. Sprints were completed in a straight line or with a change of direction after 5 m. The change of direction was either planned or reactive, with participants reacting to a visual light stimulus.Results:There was no systematic bias in any of the measures, although random variation was reduced in the straight acceleration and planned agility when considering only the fnal pair of trials, with mean coefficients of variation (CV) of 1.6% (95%CI, 1.2% to 2.4%) and 1.1% (0.8% to 1.7%), respectively. Reliability of reactive agility remained consistent throughout with mean CVs of approximately 3%. Analyses revealed a high degree of common variance between acceleration times and both planned (r2 = .93) and reactive (r2 = .83) agility, as well as between the two agility protocols (r2 = .87).Conclusion:Both planned and reactive agility could be measured reliably. Protocol design and use of a light stimulus in the reactive test emphasize physical abilities comparable with other test measures. Therefore, inclusion of a reactive light stimulus does not appear to require any additional perceptual qualities.

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Nansheng, Deng, Tian Shizhong und Xia Mei. „Photocatalytic Discolouration of Solutions of Reactive Dyes in the Presence of H2O2“. Water Quality Research Journal 30, Nr. 1 (01.02.1995): 53–60. http://dx.doi.org/10.2166/wqrj.1995.009.

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Abstract Tests for the photocatalytic degradation of solutions of three reactive dyes, Red M-5B, Procion Blue MX-R and Procion Black H-N, in the presence of H2O2 were carried out. When the solutions of the three reactive dyes were irradiated by UV or solar light, the colour of the solutions disappeared gradually. A statistical analysis of the test results indicated a linear relation between the concentration of dyes and the time of irradiation. The discolouration reaction of the solutions was of the first order. Rate equations for the discolouration reactions of dye solutions were developed. The dark reactions or the dye solutions containing H2O2 were very slow, illustrating that the photochemical reaction played a very important role. It was demonstrated that UV light and solar light (300 to 380 nm) photolyzes the HO and that the resulting OH radical reacts with the dye molecules and destroys the chromophore.

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Johannsen, Leif, Alan M. Wing und Vassilia Hatzitaki. „Effects of Maintaining Touch Contact on Predictive and Reactive Balance“. Journal of Neurophysiology 97, Nr. 4 (April 2007): 2686–95. http://dx.doi.org/10.1152/jn.00038.2007.

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Light touch contact between the body and an environmental referent reduces fluctuations of center of pressure (CoP) in quiet standing although the contact forces are insufficient to provide significant forces to stabilize standing balance. Maintenance of upright standing posture (with light touch contact) may include both predictive and reactive components. Recently Dickstein et al. (2003) demonstrated that reaction to temporally unpredictable displacement of the support surface was affected by light touch raising the question whether light touch effects also occur with predictable disturbance to balance. We examined the effects of shoulder light touch on SD of CoP rate (dCoP) during balance perturbations associated with forward sway induced by pulling on (voluntary), or being pulled by (reactive), a hand-held horizontal load. Prior to perturbation, SD dCoP was lower with light touch, corresponding to previous findings. Immediately after perturbation, SD dCoPAP was greater with light touch in the case of voluntary pull, whereas no difference was found for reflex pull. However, in the following time course, light touch contact again resulted in a significantly lower SD dCoP and faster stabilization of SD dCoP. We conclude that shoulder light touch contact affects immediate postural responses to voluntary pull but also stabilization after voluntary and reflex perturbation. We suggest that in voluntary perturbation CoP fluctuations are differentially modulated in anterioposterior and mediolateral directions to maintain light touch, which not only provides augmented sensory feedback about body self-motion, but may act as a “constraint” to the postural control system when preparing postural adjustments.

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Mijin, Dusan, Dragana Zlatic, Gordana Uscumlic und Petar Jovancic. „Solvent effects on photodegradation of CI Reactive Orange 16 by simulated solar light“. Chemical Industry 62, Nr. 5 (2008): 275–81. http://dx.doi.org/10.2298/hemind0805275m.

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Organic solvents may appear in wastewaters and other industrial waste streams containing dyes, therefore, their photodegradation catalyzed by TiO2 should be investigated. Solvent effect on photodegradation of CI Reactive Orange 16 has been studied using simulated solar light and P-25 TiO2. Methyl, ethyl and isopropyl alcohol as well as acetone were used as solvents. Photodegradation reaction was faster in methyl than in ethyl alcohol while in water was the slowest. RO16 photodegradation efficiency and reaction rate decreased in the presence of small concentration of ethanol. Higher photodegradation efficiency was observed for higher ethanol concentration. For acetone, photodegradation decreased as concentration of acetone increased. It seems that protic solvents at higher concentrations promote reaction, while at low concentrations slow down reaction. Aprotic solvents slow down reaction.

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Mohey El-Dein, A., J. A. Libra und U. Weismann. „Kinetics of decolorization and mineralization of the azo dye Reactive Black 5 by hydrogen peroxide and UV light“. Water Science and Technology 44, Nr. 5 (01.09.2001): 295–301. http://dx.doi.org/10.2166/wst.2001.0310.

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C.I. Reactive Black 5 is one of the most used reactive dyes for textile finishing. It is a diazo dye, which can be decolorized by facultative anaerobic bacteria, sulfate reducing bacteria and aerobic white rot fungi. Mineralization by microorganisms has proven difficult. Advanced oxidation processes are promising alternatives for the decolorization and mineralization of Reactive Black 5, alone and in combination with aerobic biodegradation. The kinetics of the decolorization of Reactive Black 5 using a combination of hydrogen peroxide and UV radiation have been investigated. The rate of decolorization is first order with respect to dye concentration. It is enhanced with increasing hydrogen peroxide concentrations up to an optimum value. In our model we have correlated an empirical reaction rate expression which considers the contribution of both hydrogen peroxide and UV flux radiation based on the reaction kinetics. This empirical correlation agrees well with the experimental data for these conditions. Complete decolorization corresponded with 40-50% mineralization of the dye. Further mineralization can be achieved with extended radiation time.

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Empel, Claire, und Rene M. Koenigs. „Sustainable Carbene Transfer Reactions with Iron and Light“. Synlett 30, Nr. 17 (26.06.2019): 1929–34. http://dx.doi.org/10.1055/s-0037-1611874.

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Carbenes are versatile, highly reactive intermediates with great importance in chemistry. We recently reported on our findings on safe and scalable applications of hazardous diazoacetonitrile using cheap and commercially available iron catalysts in efficient carbene transfer reactions, ranging from cyclopropanation towards C–H functionalization reactions for the synthesis of biologically important building blocks. More lately, we uncovered the reactivity of diazoalkanes under photochemical conditions using visible light and were able to demonstrate a variety of different, metal-free carbene transfer reactions, which now open up new sustainable ways for the construction of small functional molecules.1 Introduction2 Iron-Catalyzed Carbene Transfer Reactions of Diazoacetonitrile3 Metal-free Carbene Transfer Reaction with Visible Light4 Summary

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Winant, Pieterjan, und Wim Dehaen. „A visible-light-induced, metal-free bis-arylation of 2,5-dichlorobenzoquinone“. Beilstein Journal of Organic Chemistry 17 (06.09.2021): 2315–20. http://dx.doi.org/10.3762/bjoc.17.149.

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A metal-free protocol for the direct bis-arylation of 2,5-dichlorobenzoquinone with aryldiazonium salts is reported. The reactive salts are generated in situ and converted to radicals through irradiation with visible light. Reaction products precipitate from the solvent, eliminating the need for purification and thus providing a novel green method for the synthesis of versatile bis-electrophiles.

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Shah, Champaklal D., und Rajagopalan Srinivasan. „Studies of light fading of reactive dyes on cellophane“. Journal of Applied Chemistry and Biotechnology 25, Nr. 8 (25.04.2007): 615–22. http://dx.doi.org/10.1002/jctb.5020250808.

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Moussa, K., und C. Decker. „Light-induced polymerization of new highly reactive acrylic monomers“. Journal of Polymer Science Part A: Polymer Chemistry 31, Nr. 9 (August 1993): 2197–203. http://dx.doi.org/10.1002/pola.1993.080310903.

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Imada, Kunihiko, Naoki Harada und Toru Takagishi. „Fading of azo reactive dyes by perspiration and light“. Journal of the Society of Dyers and Colourists 110, Nr. 7 (22.10.2008): 231–34. http://dx.doi.org/10.1111/j.1478-4408.1994.tb01648.x.

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Park, Jae-Hong, Il-Hyoung Cho und Young-Gyu Kim. „Solar Light Induced Degradation of Reactive Dye Using Photocatalysis“. Journal of Environmental Science and Health, Part A 39, Nr. 1 (Januar 2004): 159–71. http://dx.doi.org/10.1081/ese-120027375.

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Amalraj, Augustine, und P. Anitha Pius. „Photodegradation of Reactive Red 141 and Reactive Yellow 105 Dyes Using Prepared TiO₂ Nanoparticles“. Materials Science Forum 807 (November 2014): 65–79. http://dx.doi.org/10.4028/www.scientific.net/msf.807.65.

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The photodegradation of Reactive Red 141 (RR-141) and Reactive Yellow 105 (RY-105) dyes using TiO2 nanoparticles was investigated under UV light irradiation. TiO2 was prepared by sol-gel process and characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) with Energy Dispersive X-ray analysis (EDAX) and FTIR. The effects of operational parameters such as illumination time, catalyst dose, initial concentration and pH of dye solutions on photodegradation by TiO2 have been analyzed. The degradation of the selected dyes followed pseudo-first order reaction according to the Langmuir-Hinshelwood kinetic model.

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Prasad, Ankush, und Pavel Pospíšil. „Visible Light and Ultraviolet a Radiation Impact-Photosensitization Reaction and Reactive Oxygen Species Formation“. Free Radical Biology and Medicine 65 (November 2013): S56. http://dx.doi.org/10.1016/j.freeradbiomed.2013.10.524.

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Shlenskaya, Natalia N., Nikolai A. Belich, Michael Grätzel, Eugene A. Goodilin und Alexey B. Tarasov. „Light-induced reactivity of gold and hybrid perovskite as a new possible degradation mechanism in perovskite solar cells“. Journal of Materials Chemistry A 6, Nr. 4 (2018): 1780–86. http://dx.doi.org/10.1039/c7ta10217h.

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Tonello, G., N. Hernández de Borsetti, H. Borsetti, L. Tereschuk und S. López Zigarán. „Perceived well-being and light-reactive hormones: An exploratory study“. Lighting Research & Technology 51, Nr. 2 (09.01.2018): 184–205. http://dx.doi.org/10.1177/1477153517750714.

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Light can impact psychobiological processes in a healthy or harmful way, challenging designers to better understand the resources they are manipulating. The present exploratory study compared two forms of office lighting which differed in correlated colour temperatures and light level. A holistic approach, comprising visual, emotional and biological dimensions, was used to assess the lighting conditions that could favour productivity and well-being by means of the identification of congruent relationships between objective and subjective measurements in response to light stimuli. The former included analyses of melatonin and cortisol, and the latter were psychological instruments for measuring transitory mood, somnolence, and visual comfort. Controlled experiments were run in a laboratory with a repeated measures design, which yielded fifty-six evaluations. Although no extreme ranges of correlated colour temperatures were used in this study, the spectral blue component present in the correlated colour temperature of approximately 4000 K, and also provided by the light-emitting diodes system at a higher light level, could have contributed to render most of the strong effects on the inter and intra correlations among the psychobiological responses. The mediator role of the psychological profile of the individuals was demonstrated by the significant predictive value of the perceived stress measures.

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IRIE, Hiroshi, und Kazuhito HASHIMOTO. „Challenges to High Sensitive and Visible-light Reactive TiO2 Superhydrophilicity“. Journal of the Japan Society of Colour Material 75, Nr. 6 (2002): 281–85. http://dx.doi.org/10.4011/shikizai1937.75.281.

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Vı́g, A., P. Bakó, A. Rockenbauer, L. Korecz, K. Sirbiladze, I. Rusznák und L. Tőke. „Light-induced free radicals in crown ether—reactive dyeing systems“. Polymer Degradation and Stability 85, Nr. 3 (September 2004): 1059–64. http://dx.doi.org/10.1016/j.polymdegradstab.2003.04.001.

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Josephson, Brian, Charlie Fehl, Patrick G. Isenegger, Simon Nadal, Tom H. Wright, Adeline W. J. Poh, Ben J. Bower et al. „Light-driven post-translational installation of reactive protein side chains“. Nature 585, Nr. 7826 (23.09.2020): 530–37. http://dx.doi.org/10.1038/s41586-020-2733-7.

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MURAI, KEI-ICHIRO, KAZUKI ENDO, TAISUKE NAKAGAWA, AKIKO YAMAHATA und TOSHIHIRO MORIGA. „STUDY OF VISIBLE LIGHT REACTIVE PHOTOCATALYST TIO2 PREPARED WITH THIOUREA“. International Journal of Modern Physics: Conference Series 06 (Januar 2012): 19–24. http://dx.doi.org/10.1142/s2010194512002875.

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Visible light reactive N -doped TiO 2 samples were prepared with thiourea in the sol-gel method. They had the single anatase-type crystal structure. N -doped TiO 2 synthesized with thiourea ( T - TiO 2) had a higher catalytic activity than that synthesized with urea ( U - TiO 2). The S 2 p peak observed on the surface of T - TiO 2 was assigned to S 6+ by XPS measurement. It was estimated that sulfuric acid species exist on the surface of T - TiO 2. However, it was concluded that sulfuric acid species do not have the catalytic activity directly, but depress the crystallinity, the decrease of specific surface area and the decrease of visible light absorption.

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Aguer, J. P., C. Richard und F. Andreux. „Effect of light on humic substances : production of reactive species“. Analusis 27, Nr. 5 (Juni 1999): 387–89. http://dx.doi.org/10.1051/analusis:1999270387.

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Zandalinas, Sara I., Yosef Fichman und Ron Mittler. „Vascular Bundles Mediate Systemic Reactive Oxygen Signaling during Light Stress“. Plant Cell 32, Nr. 11 (15.09.2020): 3425–35. http://dx.doi.org/10.1105/tpc.20.00453.

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Omata, Y., J. B. Lewis, S. Rotenberg, P. E. Lockwood, R. L. W. Messer, M. Noda, S. D. Hsu, H. Sano und J. C. Wataha. „Intra- and extracellular reactive oxygen species generated by blue light“. Journal of Biomedical Materials Research Part A 77A, Nr. 3 (2006): 470–77. http://dx.doi.org/10.1002/jbm.a.30663.

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Stamatelopoulos, Kimon, Georgios Georgiopoulos, Fani Athanasouli, Panagiota-Efstathia Nikolaou, Marita Lykka, Maria Roussou, Maria Gavriatopoulou et al. „Reactive Vasodilation Predicts Mortality in Primary Systemic Light-Chain Amyloidosis“. Circulation Research 125, Nr. 8 (27.09.2019): 744–58. http://dx.doi.org/10.1161/circresaha.119.314862.

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Zhuang, Dehua, Liyuan Zhang, Dawei Pan und Jinxin He. „Fading of reactive dyes on cellulose under light and perspiration“. Coloration Technology 123, Nr. 2 (April 2007): 80–85. http://dx.doi.org/10.1111/j.1478-4408.2007.00066.x.

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Higham, Luke T., Janet L. Scott und Christopher R. Strauss. „Closing the cavity: reactive and light switchable dienone-ether macrocycles“. CrystEngComm 12, Nr. 10 (2010): 2803. http://dx.doi.org/10.1039/b926132j.

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Li, Kefeng, Pingping Wang, Chuanfang Chen, Changyou Chen, Lulu Li und Tao Song. „Light irradiation helps magnetotactic bacteria eliminate intracellular reactive oxygen species“. Environmental Microbiology 19, Nr. 9 (24.08.2017): 3638–48. http://dx.doi.org/10.1111/1462-2920.13864.

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Shimokawa, Hiroaki, und Kimio Satoh. „Light and Dark of Reactive Oxygen Species for Vascular Function“. Journal of Cardiovascular Pharmacology 65, Nr. 5 (Mai 2015): 412–18. http://dx.doi.org/10.1097/fjc.0000000000000159.

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Dominguez-Rodriguez, Alberto, Juan Carlos Kaski, Pedro Abreu-Gonzalez und Martín Garcia-Gonzalez. „Cross-talk between C-reactive protein and light/dark variations“. International Journal of Cardiology 120, Nr. 1 (August 2007): 130. http://dx.doi.org/10.1016/j.ijcard.2006.07.223.

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Hernandez-Hernandez, Arturo, Victor Tapio Rangel-Kuoppa, Thomas Plach, Francisco De Moure-Flores, Jose G. Quiñones-Galvan, Karen E. Nieto Zepeda, Martin Zapata-Torres und Miguel Meléndez-Lira. „Synthesis of Light Emitting Ge Nanocrystals by Reactive RF Sputtering“. Solid State Phenomena 178-179 (August 2011): 61–66. http://dx.doi.org/10.4028/www.scientific.net/ssp.178-179.61.

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In this work we report the results of the synthesis, structural and optical characterization of SiO2/Ge/SiO2heterostructures by reactive RF sputtering. The SiO2films were grown by reactive sputtering employing a plasma mixture of oxygen and argon. The Ge layer was grown employing an Ar atmosphere. The samples were prepared on p-type Si (1 1 1) substrates by reactive sputtering. The effect of the partial pressure of oxygen on the electronic properties of the heterostructure is reported[1]. Structural characterization was carried out by grazing angle X-ray difraction. Surface roughness was quantified by atomic force microscopy. The presence of Ge nanocrystals (Ge-NCs) was evidenced by X-ray diffraction. The vibrational properties were studied by Raman spectroscopy. The Raman spectra showed modes associated to germanium indicating the formation of low dimensionality germanium particles embedded within a SiO2matrix. Photoluminescence emission is observed around ~1.7 eV and it is associated to the quantum confinement of carriers in Ge-NCs. Ohmic contacts were deposited using a van der Pauw geometry employing an a AuSb alloy for the contacts. Temperature dependent Hall (T-Hall) measurements were done between 35 K and 150 K, using the van der Pauw method. The results indicated low resistivity values that could be explained due to some variable range hopping conduction mechanism.

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SUNDRARAJAN, M., G. VISHNU und K. JOSEPH. „Ozonation of light-shaded exhausted reactive dye bath for reuse“. Dyes and Pigments 75, Nr. 2 (2007): 273–78. http://dx.doi.org/10.1016/j.dyepig.2006.05.036.

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Idrici, Dihia, Samuel Goroshin, Michael J. Soo und David L. Frost. „Light emission signatures from ballistic impact of reactive metal projectiles“. International Journal of Impact Engineering 150 (April 2021): 103814. http://dx.doi.org/10.1016/j.ijimpeng.2021.103814.

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Bassi, Roberto, und Luca Dall'Osto. „Dissipation of Light Energy Absorbed in Excess: The Molecular Mechanisms“. Annual Review of Plant Biology 72, Nr. 1 (17.06.2021): 47–76. http://dx.doi.org/10.1146/annurev-arplant-071720-015522.

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Light is essential for photosynthesis. Nevertheless, its intensity widely changes depending on time of day, weather, season, and localization of individual leaves within canopies. This variability means that light collected by the light-harvesting system is often in excess with respect to photon fluence or spectral quality in the context of the capacity of photosynthetic metabolism to use ATP and reductants produced from the light reactions. Absorption of excess light can lead to increased production of excited, highly reactive intermediates, which expose photosynthetic organisms to serious risks of oxidative damage. Prevention and management of such stress are performed by photoprotective mechanisms, which operate by cutting down light absorption, limiting the generation of redox-active molecules, or scavenging reactive oxygen species that are released despite the operation of preventive mechanisms. Here, we describe the major physiological and molecular mechanisms of photoprotection involved in the harmless removal of the excess light energy absorbed by green algae and land plants. In vivo analyses of mutants targeting photosynthetic components and the enhanced resolution of spectroscopic techniques have highlighted specific mechanisms protecting the photosynthetic apparatus from overexcitation. Recent findings unveil a network of multiple interacting elements, the reaction times of which vary from a millisecond to weeks, that continuously maintain photosynthetic organisms within the narrow safety range between efficient light harvesting and photoprotection.

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Huang, Ying-Ying, Hwanjun Choi, Yu Kushida, Brijesh Bhayana, Yuguang Wang und Michael R. Hamblin. „Broad-Spectrum Antimicrobial Effects of Photocatalysis Using Titanium Dioxide Nanoparticles Are Strongly Potentiated by Addition of Potassium Iodide“. Antimicrobial Agents and Chemotherapy 60, Nr. 9 (05.07.2016): 5445–53. http://dx.doi.org/10.1128/aac.00980-16.

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ABSTRACTPhotocatalysis describes the excitation of titanium dioxide nanoparticles (a wide-band gap semiconductor) by UVA light to produce reactive oxygen species (ROS) that can destroy many organic molecules. This photocatalysis process is used for environmental remediation, while antimicrobial photocatalysis can kill many classes of microorganisms and can be used to sterilize water and surfaces and possibly to treat infections. Here we show that addition of the nontoxic inorganic salt potassium iodide to TiO2(P25) excited by UVA potentiated the killing of Gram-positive bacteria, Gram-negative bacteria, and fungi by up to 6 logs. The microbial killing depended on the concentration of TiO2, the fluence of UVA light, and the concentration of KI (the best effect was at 100 mM). There was formation of long-lived antimicrobial species (probably hypoiodite and iodine) in the reaction mixture (detected by adding bacteria after light), but short-lived antibacterial reactive species (bacteria present during light) produced more killing. Fluorescent probes for ROS (hydroxyl radical and singlet oxygen) were quenched by iodide. Tri-iodide (which has a peak at 350 nm and a blue product with starch) was produced by TiO2-UVA-KI but was much reduced when methicillin-resistantStaphylococcus aureus(MRSA) cells were also present. The model tyrosine substrateN-acetyl tyrosine ethyl ester was iodinated in a light dose-dependent manner. We conclude that UVA-excited TiO2in the presence of iodide produces reactive iodine intermediates during illumination that kill microbial cells and long-lived oxidized iodine products that kill after light has ended.

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Huang, Xubo, Jianjun Zhao, Xianqiang Xiong, Shengwei Liu und Yiming Xu. „Positive effect of Fe3+ ions on Bi2WO6, Bi2MoO6 and BiVO4 photocatalysis for phenol oxidation under visible light“. Catalysis Science & Technology 9, Nr. 16 (2019): 4413–21. http://dx.doi.org/10.1039/c9cy00855a.

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Catalyst activity is notably enhanced on simple addition of Fe³⁺ ions. The reaction is fast initially and then becomes slow, but the formation of reactive species is accelerated even in the slow process.

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Miller, Lori K., P. Joanne Rowe und Jacalyn Lund. „Correlation of Eye Color on Self-Paced and Reactive Motor Performance“. Perceptual and Motor Skills 75, Nr. 1 (August 1992): 91–95. http://dx.doi.org/10.2466/pms.1992.75.1.91.

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Researchers continue to examine the distinctiveness of motor performance by dark- versus light-eyed individuals. Dark-eyed individuals generally perform better at reactive type tasks (boxing, hitting a ball, defensive positions in football, rotary pursuit), while light-eyed individuals perform better at self-paced tasks (bowling, golf, pitching baseballs). Subjects performed two tasks, rotary pursuit and ball tossing (with light and dark background). Eye color (light or dark) and accuracy of performance were recorded for each subject. No significant difference was found between eye color and performance on the pursuit rotor (reactive activity). A significant difference was found between men's and women's performance in throwing a ball (self-paced activity) at a light-colored background.

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Latif, Zahid, Fan Liu, Lin Wei He und Ying Jie Cai. „Improvement of Light Fastness of Liyuan Blue FL-RN Reactive Dye“. Advanced Materials Research 1120-1121 (Juli 2015): 198–202. http://dx.doi.org/10.4028/www.scientific.net/amr.1120-1121.198.

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Cotton fabric was dyed with Liyuan Blue FL-RN reactive dye. The dye exhaustion and fixation percentages were calculated for all light, medium and dark shades. The dye shows very good exhaustion and fixation properties. Dyed samples were tested for light fastness property as per international standards. The results indicates the dye has a good light fastness property. The effect of UV absorber was studied in order to improve light fastness property. Cationic UV absorber CANFIX SUN was applied on the dyed cotton fabric by exhaust method. The results show that the color depth was similar after UV absorber treatment. In all the cases the use of UV absorber improved the light fastness of dyed fabrics as compared to untreated dyed samples.

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