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Letteratura scientifica selezionata sul tema "ORTHOPHOSPHATE PHOSPHOR"

Autore: Grafiati

Pubblicato: 16 settembre 2023

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Articoli di riviste sul tema "ORTHOPHOSPHATE PHOSPHOR"

1

Gupta, Palvi, A. K. Bedyal, Vinay Kumar, Y. Khajuria, O. M. Ntwaeaborwa e H. C. Swart. "A Promising Orange-Red Nanocrystalline Potassium Lanthanum Orthophosphate for White Light-Emitting Diodes". Indian Journal of Materials Science 2014 (19 febbraio 2014): 1–4. http://dx.doi.org/10.1155/2014/794680.

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The spectral properties of the K3La(PO4)2:Eu3+ nanophosphors synthesized by the combustion method are reported. The phosphors were characterized by X-ray diffraction, transmission electron microscopy, and optical spectroscopy. The XRD pattern reveals a pure monoclinic phase of the K3La(PO4)2 with the average particle size of 30 nm in diameter. Under UV excitation, the phosphors exhibited several emission bands which were assigned to 4f-4f transitions of Eu3+ ions. The red shade of the Eu3+ ion with the CIE coordinates (x, y) as (0.63, 0.37) suggests that this material is a promising phosphor for near-UV InGaN-based LED lighting.

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2

Pradhan, M. K., T. Lakshmana Rao, U. K. Goutam e S. Dash. "Probing structural and photophysical features of Eu3+ activated NaCdPO4 orthophosphate phosphor". Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 240 (ottobre 2020): 118593. http://dx.doi.org/10.1016/j.saa.2020.118593.

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3

Song, Hee Jo, Chan Woo Lee, Sung Won Hwang e In Sun Cho. "Wet-chemical preparation of barium magnesium orthophosphate, Ba2Mg(PO4)2:Eu2+, nanorod phosphor with enhanced optical and photoluminescence properties". RSC Advances 6, n. 66 (2016): 61378–85. http://dx.doi.org/10.1039/c6ra11156d.

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Abstract (sommario):

We report a wet-chemical synthesis of yellow-emitting nanorod phosphors based on a Eu²⁺-doped Ba₂Mg(PO₄)₂ (BMP:Eu) orthophosphate compound, and its enhanced optical and photoluminescence properties.

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4

Wu, Haoyi, Zheng-Ming Wang, Kazuhide Koike, Nobuaki Negishi e Yahong Jin. "Hybridization of silver orthophosphate with a melilite-type phosphor for enhanced energy-harvesting photocatalysis". Catalysis Science & Technology 7, n. 17 (2017): 3736–46. http://dx.doi.org/10.1039/c7cy00955k.

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A water-resistant Sr₂MgSi₂O₇:Eu²⁺,Dy³⁺ long-lasting phosphor was hybridized with visible-light active Ag₃PO₄ to achieve enhanced photocatalysis and energy-harvesting long lasting photocatalysis.

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5

Mohan Prakash, Y. H., D. Prakash Babu, Madesh Kumar M., S. Ponkumar e Mani Rahulan K. "Novel strontium zirconium di-orthophosphate phosphor for super capacitor and dosimetry application". Spectroscopy Letters 54, n. 3 (27 febbraio 2021): 204–11. http://dx.doi.org/10.1080/00387010.2021.1892767.

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6

Bedyal, A. K., A. K. Kunti, Vinay Kumar e H. C. Swart. "Effects of cationic substitution on the luminescence behavior of Dy3+ doped orthophosphate phosphor". Journal of Alloys and Compounds 806 (ottobre 2019): 1127–37. http://dx.doi.org/10.1016/j.jallcom.2019.07.305.

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7

Sahu, Mukesh K., Harpreet Kaur, B. V. Ratnam, J. Suresh Kumar e M. Jayasimhadri. "Structural and spectroscopic characteristics of thermally stable Eu3+ activated barium zinc orthophosphate phosphor for white LEDs". Ceramics International 46, n. 16 (novembre 2020): 26410–15. http://dx.doi.org/10.1016/j.ceramint.2020.07.263.

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8

Zhu, Ge, Yurong Shi, Masayoshi Mikami, Yasuo Shimomura e Yuhua Wang. "Observation, identification and characterization of strong self-reduction process in a orthophosphate phosphor CaZr4(PO4)6:Eu". Materials Research Bulletin 50 (febbraio 2014): 405–8. http://dx.doi.org/10.1016/j.materresbull.2013.11.012.

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9

Mishra, Savvi, G. Swati, B. Rajesh, Kriti Tyagi, Bhasker Gahtori, B. Sivaiah, N. Vijayan et al. "Luminescence and advanced mass spectroscopic characterization of sodium zinc orthophosphate phosphor for low-cost light-emitting diodes". Luminescence 31, n. 2 (21 luglio 2015): 348–55. http://dx.doi.org/10.1002/bio.2966.

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10

Chékir-Mzali, Jalila, Karima Horchani-Naifer e Mokhtar Férid. "Investigations of the effect of trivalent erbium concentration on orthophosphate powder for green and yellow-orange light emitting phosphor". Journal of Luminescence 212 (agosto 2019): 368–73. http://dx.doi.org/10.1016/j.jlumin.2019.04.044.

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Più fonti

Tesi sul tema "ORTHOPHOSPHATE PHOSPHOR"

1

Brothers, Candice E. "The Efficiency of Orthophosphate (SRP) Uptake by Five Biochars and Five Biochar-Soil Mixes". University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1407613603.

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2

Moberg, Mikhal. "THE EFFECTIVENESS OF SPECIFICALLY DESIGNED FILTER MEDIA TO REDUCE NITRATE AND ORTHOPHOSPHATE IN STORMWATER RUNOFF". Master's thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3677.

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Abstract (sommario):

Throughout Central Florida surface water and ground water are decreasing in quantity and quality in part because of excess Nitrate and Phosphorus nutrients. Stormwater runoff serves as a medium for transport of Nitrate and Phosphorus to surface water and ground water. The goal of this experiment is assess the Nitrate and Phosphorus removal in stormwater using select media. The results of a literature search, batch test experimentation and column test experimentation are used to determine an optimal media blend that may be implemented in detention ponds to reduce Nitrate and Phosphorus. The extensive literature search revealed 32 different media that may be used to remove Nitrate and Phosphorus. Each potential media was qualitatively and quantitatively evaluated based on 5 criteria: 1) relevance, 2) permeability, 3) cost, 4) availability in Florida, and 5) additional environmental benefit. The top 7 performing media: Florida peat, sandy loam, woodchips, crushed oyster shell; crushed limestone, tire crumb and sawdust were selected for batch test experimentation. The aerobic conditions in batch test experimentation prohibited the growth of denitrifying bacteria, therefore media mixes were selected for column test experimentation based on Ammonia and Orthophosphate concentrations. Batch test experimentation showed the most effective media to be 50% sand, 30% tire crumb, 20% sawdust by weight (media mix 1) and 50% sand, 25% sawdust, 15% tire crumb, 10% limestone by weight (media mix 2). Media mix 1, media mix 2 and a control are tested in column test experimentation, where the control is site soil from Hunters Trace development in Ocala, Florida. Column test experimentation models a dry detention pond where water passes through a 48 inch unsaturated zone then a 48 inch saturated zone. To test Nitrate and Orthophosphate removal potential, pond water augmented with Nitrate (0.38, 1.26, 2.5 mg/L NO3-N) and Orthophosphate (0.125, 0.361, 0.785 mg/L PO4-P) was pumped into the columns. Media mix 1 and media mix 2 outperformed the control in both Nitrate and Orthophosphate removal. Media mix 1 and media mix 2 had Nitrate removal efficiencies ranging from 60% to 99% and the control had Nitrate removal efficiencies ranging from 38%-80%. Media mix 1 and media mix 2 averaged Orthophosphate removal efficiencies ranging from approximately 42% to 67%. For every run in every influent Orthophosphate concentration the saturated control added Orthophosphate to the water. The Nitrate and Orthophosphate removal performances for media mix 1 and media mix 2 could not be directly compared because of different influent saturated nutrient concentrations.
M.S.
Department of Civil and Environmental Engineering
Engineering and Computer Science
Environmental Engr MSEnvE

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3

Shreckhise, Jacob Hamilton. "Phosphorus Requirement and Chemical Fate in Containerized Nursery Crop Production". Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/83893.

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Abstract (sommario):

Environmental contamination issues related to phosphorus (P) in surface waters substantiates the need to identify minimally-sufficient P fertilization amounts for production of containerized nursery crops and better understand the effect of routine amendments (i.e., dolomite [DL] and micronutrient fertilizer [MF]) added to pine bark substrates on chemical fate of P fertilizer. Four studies were conducted to accomplish two overarching objectives: 1) determine the minimum P fertilization amount and corresponding pore-water P concentration needed to achieve maximal growth of common containerized nursery crops and 2) determine the effect of DL and MF amendments in pine bark on P retention during irrigation and P fractions in substrate pore-water. In a fertigation, greenhouse study, calculated lowest P-fertilizer concentration that sustained maximal growth in Hydrangea paniculata ‘Limelight’ (panicle hydrangea) and Rhododendron ‘Karen’ (azalea) was 4.7 and 2.9 mg·L⁻¹ , respectively, and shoot growth Ilex crenata ‘Helleri’ (holly) was the same when fertilized with 0.5 to 6.0 mg·L⁻¹ P. Porewater P concentrations corresponding with treatments that sustained maximal growth of panicle hydrangea, azalea and holly were as low as 0.6, 2.2 and 0.08 mg·L⁻¹ P, respectively. In a separate study, utilizing low-P controlled-release fertilizers (CRFs), shoot growth of Hydrangea macrophylla ‘P11HM-11’ (bigleaf hydrangea) produced in two ecoregions was maximal when fertilized with as little as 0.3 g CRF-P per 3.8-L container, a 50% P reduction from the industrystandard CRF. Holly required 0.2 or 0.4 g CRF-P depending on ecoregion. Mean pore-water P concentrations that corresponded with highest SDW were 0.8 and 1.2 mg·L⁻¹ for hydrangea and holly, respectively. When irrigating fallow pine bark columns containing CRF for 48 d, amending pine bark with DL and MF reduced orthophosphate-P (OP-P) leachate concentrations by ≈ 70%, most of which was retained within the substrate. In a greenhouse study, containerized Lagerstroemia ‘Natchez’ (crape myrtle) were grown for 91 d in pine bark containing CRF. In pine bark amended with DL and MF, pore-water OP-P and total P concentrations, measured approximately weekly, were reduced by, on average, 64% and 58%, respectively. Total dry weight values of plants grown with DL plus MF or MF-only were 40% higher than those grown with no amendments; however, tissue P amounts and relative P uptake efficiency were the same among plants in these three treatments. Therefore, sorption of OP-P by DL and MF reduced water-extractable OP-P but did not limit P uptake by plants.
Ph. D.

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4

Pavlíková, Marcela. "Hodnocení zatížení sedimentů drobných vodních toků fosforem". Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-390249.

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Abstract (sommario):

The issue of phosphorus in sediments of small watercourses and phosphorus forms are often out of interest, unlike phosphorus and its forms in sediments of water reservoirs. The thesis is focused on the development and evaluation of methods for the determination of total phosphorus by modifying commonly used methods and evaluation of methods for the determination of selected forms of phosphorus in small watercourses sediments. Over 1,152 analyses of sediment samples collected in four seasons and four locations and in three paralell determinations were done. The total phosphorus in the sediments was assessed by four methods, further 7 other forms of phosphorus were evaluated by one to three methods, according to different forms of phosphorus. The data file was subjected to statistical analysis. The aim of statistical analysis was to evaluate phosphorus concentrations, depending on the used method. Additional aim of statistical analysis was to observe dependencies of phosphorus concentrations on metals and identify the impact of periods and locations on the concentration of phosphorus.

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Capitoli di libri sul tema "ORTHOPHOSPHATE PHOSPHOR"

1

Shinde, Kartik N., S. J. Dhoble, H. C. Swart e Kyeongsoon Park. "Some Orthophosphate Phosphors". In Phosphate Phosphors for Solid-State Lighting, 101–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-34312-4_5.

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2

Broberg, Ola, e Kurt Pettersson. "Analytical Determination of Orthophosphate in Water". In Phosphorus in Freshwater Ecosystems, 45–59. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3109-1_5.

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3

Nenov, Valentin, Hyusein Yemendzhiev e Gergana Peeva. "Phosphorus Recovery through Waste Transformation: Implication for an Alternative Fertilizer". In Phosphorus in Soils and Plants [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.111856.

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Abstract (sommario):

Presently, the recovery and reuse of phosphorus are still far from being a mainstream practice. Yet, the techniques already accepted and applied differ by the origin of the used matter (wastewater, sludge, ash) and are mainly focused on the process of precipitation. One of these techniques is struvite (magnesium ammonium phosphate; MAP; MgNH4PO4·6H2O) precipitation, which can be implemented in wastewater treatment plants that use enhanced biological or semi-biological/chemical phosphorus (P) removal. Struvite/MAP is formed by a basic precipitation reaction in different stages of the wastewater treatment process, where magnesium (Mg2+), ammonium (NH4+), and orthophosphate (PO4−3). This chapter aims to discuss: (i) the progress in extraction of P from sewage sludge and animal manure; (ii) the methods to create optimal conditions for struvite precipitation in such media; (iii) the avenues for overcoming the problems associated with choosing the right Mg source, pH adjustment and the non-acceptable level of organic matter in the initial suspension; and (iv) the implication of struvite as an alternative fertilizer for the global agriculture sector.

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Atti di convegni sul tema "ORTHOPHOSPHATE PHOSPHOR"

1

Prakash, Ram, e Rubby Mahajan. "Structural and luminescent properties of Europium activated magnesium orthophosphate phosphor". In DAE SOLID STATE PHYSICS SYMPOSIUM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0017195.

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2

Vadan, Maria, Elisabeth-Jeanne Popovici, Laura Ungur, Cristina Ciocan, Ligia Pascu e D. Macarovici. "Synthesis of cerium-activated strontium-magnesium orthophosphate phosphors". In ROMOPTO 2000: Sixth Conference on Optics, a cura di Valentin I. Vlad. SPIE, 2001. http://dx.doi.org/10.1117/12.432863.

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3

Huizeng Liu, Guofeng Wu, Tiezhu Shi, Zengyun Hu e Qiming Zhou. "Estimating orthophosphate phosphorus concentration in Shenzhen Bay with remote sensing and legacy in-situ measurements". In 2016 4th International Workshop on Earth Observation and Remote Sensing Applications (EORSA). IEEE, 2016. http://dx.doi.org/10.1109/eorsa.2016.7552780.

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4

Teodorof, Liliana, Adrian Burada, Cristina Despina, Daniela Seceleanu-Odor, Cristian Trifanov, Antoaneta Ene, Elena Zubcov, Thomas Spanos e Oleg Bogdevich. "Environmental toxicants evaluation in a modern monitoring system - Romanian monitox network area". In Xth International Conference of Zoologists. Institute of Zoology, Republic of Moldova, 2021. http://dx.doi.org/10.53937/icz10.2021.04.

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Abstract (sommario):

In this paper a class consisting of 8 environmental toxicants were selected to assess Danube River water quality between Calarasi-Silistra sector until the river flow into the Black Sea, the Romanian Monitox Network Area. A comprehnsive comparison between 2 years of investigations in terms of nutrients contribution, such as different forms of nitrogen (ammonium nitrogen (N-NH4+), nitrite nitrogen (N-NO2-), nitrate nitrogen (N-NO3-), organic nitrogen, total nitrogen (TN)) and phosphorus (orthophosphate phosphorus (P-PO4 -3), total phosphorus (TP)), was made in order to provide information on the spatial and temporal variations of this river water quality. Sampling was performed according to European standards and quantitatively analysed using molecular spectrophotometry using UV VIS spectrophotometer Perkin Elmer Lambda 650S. The obtained results showed differences in nitrite nitrogen loads in surface water samples with higher values in the samples collected from the sampling points situated at the mouths of the Danube River into the Black Sea in 2020. Regarding quality classes, the surface waters were generally framed, in good quality class. The nutrients concentrations, combined in CCME WQI index, give an overview on surface water quality assessement in Romanian Monitox Network Area, with a good quality of Lower Danube (Constanta in 2019 and 2020) and fair quality of Danube Delta in 2020, but very closed to good quality.

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GRINBERGA, Linda, e Ainis LAGZDINS. "NUTRIENT RETENTION IN SURFACE FLOW CONSTRUCTED WETLAND IN AGRICULTURAL LAND IN LATVIA". In RURAL DEVELOPMENT. Aleksandras Stulginskis University, 2018. http://dx.doi.org/10.15544/rd.2017.179.

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Abstract (sommario):

The research site consists of a pilot-scale surface flow constructed wetland at the farm Mezaciruli located in Zalenieki County, Jelgava Region, in the middle part of Latvia. The constructed wetland was installed in June 2014 to improve water quality in agricultural catchment and examine nutrient retention at the constructed wetland receiving surface and drainage runoff. The constructed wetland’s surface area of 0.37 ha corresponds to 0.5 % of the total catchment area. During the observation period of 32 months (2014-2017) water quality parameters such as total suspended solids (TSS), nitrate-nitrogen (NO3-N), ammonium-nitrogen (NH4-N), total nitrogen (TN), orthophosphate-phosphorus (PO4-P), and total phosphorus (TP) were monitored twice a month using a grab sample approach. Retention efficiency for monitored water quality parameters was calculated based on their concentrations at the inlet and outlet. The monitoring results obtained during this study showed a reduction within the constructed wetland for all examined parameters. The concentrations of NO3-N, NH4-N and TN were reduced on average by 13 %, 15 % and 16 %, respectively. PO4-P and TP concentrations were reduced on average by 38 % and 36 %, respectively. Total suspended solids were reduced by 31% at the outlet of the constructed wetland. However, in some cases, an increase in nutrient concentrations in water leaving the constructed wetland was observed. Therefore, there is a need for further research to investigate causes of such increase.

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DUBRA, Vytautas. "SOME PECULIARITIES OF SPATIAL DISTRIBUTION OF LAND-BASED INORGANIC NUTRIENTS IN THE COASTAL PART OF THE BALTIC SEA". In Rural Development 2015. Aleksandras Stulginskis University, 2015. http://dx.doi.org/10.15544/rd.2015.070.

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Abstract (sommario):

The Baltic Sea is a semi-enclosed sea with remarkable cyclonic circulation. The most attention must be paid to the local-scale factors playing the significant role in the overall figures. Fresh water inflow takes the majority of the mass budget income thus enabling local streams. The bathymetry of the Lithuanian Baltic zone is lowering gradually towards the open sea and has no significant deeps or depths. As the little exception there is a deeper basin, which stretches from the Curonian Spit until it reaches the approaches of the Southern Gotland Deep. The long-term investigations of spatial seasonal distribution of inorganic nutrients (nitrite, nitrate and orthophosphate) resulted to some regularities depending on prevailing wind scale duration and force. The results obtained during the experiment showed the complicacy of field structure. Extremely heterogeneous patterns of nutrients are formed when northern or eastern winds or breezes are prevailing. After the other wind directions significant decrease of heterogeneity was observed. Assessment showed that Curonian Lagoon water entering the Baltic Sea is enriched with dissolved inorganic nitrogen 6 times more and dissolved inorganic phosphorus concentration is higher by 2 times in comparison to the open sea values in winter.

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