Relevant bibliographies by topics / Bayer Process

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Bayer Process'

Author: Grafiati
Published: 4 June 2021
Last updated: 20 February 2023

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Journal articles on the topic "Bayer Process"

1

MARCIANO, S., N. MUGNIER, P. CLERIN, B. CRISTOL, and P. MOULIN. "Nanofiltration of Bayer process solutions." Journal of Membrane Science 281, no. 1-2 (September 15, 2006): 260–67. http://dx.doi.org/10.1016/j.memsci.2006.03.040.

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Goronovski, A., J. Vind, V. Vassiliadou, D. Panias, and A. H. Tkaczyk. "Radiological assessment of the Bayer process." Minerals Engineering 137 (June 2019): 250–58. http://dx.doi.org/10.1016/j.mineng.2019.04.016.

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Königsberger, Erich. "Thermodynamic simulation of the Bayer process." International Journal of Materials Research 99, no. 2 (February 2008): 197–202. http://dx.doi.org/10.3139/146.101624.

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Ouellet, Valérie, Simon Bergeron, and Donald Verville. "BAYER PROCESS CONTROL AT ALCAN VAUDREUIL WORKS." IFAC Proceedings Volumes 40, no. 11 (2007): 25–28. http://dx.doi.org/10.3182/20070821-3-ca-2919.00004.

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Smeulders, Damian E., Michael A. Wilson, and Lyndon Armstrong. "Insoluble Organic Compounds in the Bayer Process." Industrial & Engineering Chemistry Research 40, no. 10 (May 2001): 2243–51. http://dx.doi.org/10.1021/ie000925n.

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Afonso de Magalhães, Maria Elizabeth, and Matthieu Tubino. "Recovering gallium from residual bayer process liquor." JOM 43, no. 6 (June 1991): 37–39. http://dx.doi.org/10.1007/bf03220596.

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Müller-Steinhagen, H. "Determining silica solubility in bayer process liquor." JOM 50, no. 11 (November 1998): 44–49. http://dx.doi.org/10.1007/s11837-998-0286-6.

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Sancho, J., M. P. García, M. F. García, J. Ayala, and L. E. Verdeja. "The possible use of Bayer process cyclone fines for manufacture of abrasives." Revista de Metalurgia 38, no. 6 (December 30, 2002): 433–42. http://dx.doi.org/10.3989/revmetalm.2002.v38.i6.429.

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Wagh, Arun S., and Victor E. Douse. "Silicate bonded unsintered ceramics of Bayer process waste." Journal of Materials Research 6, no. 5 (May 1991): 1094–102. http://dx.doi.org/10.1557/jmr.1991.1094.

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Sodium silicates are investigated to enhance the strengths of Bayer process muds and develop structural ceramics without sintering. With an impregnation of sodium silicate from 2% to 10% concentration in red mud, the fracture toughness is enhanced from 0.2 to 0.9 MPa. Compression strengths of 25.1 MPa (3628 psi) have been attained with red mud at 10% silicate concentration. Similar enhancements by a factor of 4 to 5 have been obtained for modulus of rupture and Brinell hardness number. It is shown that these properties do not deteriorate in acidic and neutral environment in water, implying stability to weathering conditions. SEM investigations reveal elongated crystal formation, possibly of aluminum and iron silicates in the aggregate. These crystals act like whiskers enhancing the strength. The process is applicable for development of low-cost construction components.
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Wellington, Max, and Franklin Valcin. "Impact of Bayer Process Liquor Impurities on Causticization." Industrial & Engineering Chemistry Research 46, no. 15 (July 2007): 5094–99. http://dx.doi.org/10.1021/ie070012u.

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Dissertations / Theses on the topic "Bayer Process"

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Xu, Bingan. "Lime chemistry in the Bayer process." Thesis, Xu, Bingan (1991) Lime chemistry in the Bayer process. PhD thesis, Murdoch University, 1991. https://researchrepository.murdoch.edu.au/id/eprint/52725/.

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A fundamental study of the kinetics and mechanism of lime chemistry in the Bayer process has been undertaken. To simplify the study and avoid interference from impurities, experiments were carried out in relatively pure systems. Calcium hydroxide and calcium oxide, the solid reactants, were used in two different forms: rotating discs and powders. The former gives the most useful mechanistic information, while the latter most closely approximates industrial practice. The structure and composition of the surface was also investigated using a variety of techniques including scanning electron microscopy. The dissolution of calcium hydroxide in water has been investigated under a variety of conditions. A study of the dissolution of rotating calcium hydroxide discs at low rotation speeds (<250 rpm) showed that the reaction rate increased with increasing rotation speed and temperature but decreased when the solution contained either calcium ions or hydroxide ions. It was concluded that the dissolution of calcium hydroxide under these circumstances is controlled by the diffusion of calcium ions and hydroxide ions away from the calcium hydroxide surface. Using the Levich equation for mass transfer from a rotating disc and assuming that the dissolution step prior to slow diffusion from the surface is at equilibrium, it is possible to estimate the dissolution rate. Rates calculated in this way agree well with the measured rates. At high rotation speeds the reaction becomes controlled by the speed of the dissolution process itself. For powdered calcium hydroxide samples, it was found that the dissolution process can be approximated by the "shrinking sphere" model and that the associated rate constant behaves similarly to that for a rotating disc under conditions of diffusion control. An investigation of the slaking of calcium oxide discs in water and solutions containing Ca2+ or OH- ions showed that the slaking process has the same behaviour as that for calcium hydroxide the diffusion discs, i.e. of Ca2+ or OH- ions away from the surface is also the rate-determining step when the reaction is slow. Therefore, the theory proposed for the dissolution of Ca(OH)2 discs applies to the slaking reactions. However , when the reaction rate is fast enough, the entire slaking process becomes chemically controlled. The similarity of the results obtained using both Ca(0H)2 discs and CaO discs indicates that the reaction of calcium oxide with water to form calcium hydroxide is not the rate-determining step. It was found that the slaking of powdered calcium oxide also follows the shrinking sphere model proposed for the dissolution of calcium hydroxide particles. The rate of slaking depended on the size of the calcium oxide particles and the calcination conditions (temperature and time) under which the calcium oxide was formed from calcium carbonate. The presence of Ca2+ ions and OH- ions causes a reduction in the slaking rate similar to that observed for rotating disc samples under the same conditions, suggesting that the reaction mechanism is the same for both powdered and disc samples. The slaking of both powdered CaO and rotating CaO disc samples in sodium carbonate solution is controlled by the deposition of calcium carbonate on the dissolving surface. This results in a reduction in the dissolution rate of the calcium hydroxide or calcium oxide, and a reduction in the rate of precipitation of calcium carbonate on the surface. Before the blocking layer of calcium carbonate is formed, the loss of carbonate ions from solution is at least partially diffusion controlled. A study of the slaking of CaO in sodium aluminate solution was also conducted. The experimental results show that calcium aluminate precipitates on the reacting CaO surface, leading to a reduction in the dissolution rate of Ca(OH)2. The experimental results also suggest that the precipitation of calcium aluminate is chemically controlled while the slaking reaction remains diffusion controlled. Under competitive reaction conditions, the rate of CaCO3 formation is faster than that of Ca3Al2O5.
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Lee, Mei-yin. "The mechanism of gibbsite crystal growth in Bayer liquor." Thesis, Curtin University, 1998. http://hdl.handle.net/20.500.11937/759.

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Although the precipitation of aluminium trihydroxide as gibbsite, via the Bayer process has been widely studied, the mechanism of crystal growth is poorly understood. This work focus on the morphology of gibbsite and the relative growth rates of individual crystal faces.Initial work was carried out to characterize aluminium trihydroxide and it was found that bayerite, another polymorph, precipitated at temperatures below 50 [degrees] C and its morphology depended on the method of precipitation. Gibbsite however, precipitated above this temperature and its morphology depended on the type of alkali aluminate solutions used. The method of precipitation does not affect the morphology, only the size of the precipitate formed. The morphology of gibbsite can be altered by the addition of organic compounds which are known to inhibit gibbsite precipitation. Some of these compounds were found to selectively inhibit the growth of individual crystal faces, thus altering the overall morphology of gibbsite. Boehmite, a polymorph of aluminium hydroxide, can be produced by partial dehydration of gibbsite at 300T. The morphology of boehmite consisted of diamond shaped crystals.The influence of cation incorporation on the morphology of gibbsite was studied experimentally and computationally (molecular modelling). These studies showed that there is a linear relationship between the amount of cation incorporated and atomic radii and between the amount of cation incorporated and the defect energy calculated. The equilibrium morphology of gibbsite predicted in the absence of media matched the morphology of gibbsite grown slowly from sodium aluminate, implying that the amount of sodium incorporation is low in these crystals.The growth rates of individual crystal faces were measured in situ, and found to be a function of supersaturation squared for the prismatic faces, possibly indicating that E growth occurs by spiral growth mechanism. The growth of the basal face was found to follow the spiral growth mechanism below a relative supersaturation of 0.815 and the birth and spread mechanism above this level. The activation energies and kinetic coefficients for the individual prismatic faces were also determined.Growth rate dispersion was observed in these microscopic studies, but the question of size dependency remains unanswered.The overall growth rates of gibbsite crystal, determined using rapid dynamic light scattering, was found to be an exponential function of supersaturation indicative of a birth and spread growth mechanism.
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Kenyon, Nicola Jane. "Investigation of scale formation in the Bayer process." Thesis, University of Southampton, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494464.

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Jamieson, Evan John. "Development and utilisation of Bayer process by-products." Thesis, Curtin University, 2014. http://hdl.handle.net/20.500.11937/198.

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The Bayer Process is the hydrometallurgical treatment of bauxite ore for the extraction of alumina. This thesis reports on the development and utilisation of key by-products including:• Carbonated Red Mud and Alkaloam® - produced from the fine bauxite residue commonly termed red mud• Red Sand™ - manufactured from coarse bauxite residue• Red Lime™ - a by-product of liquor causticisation• Bayer-derived geopolymers - a cement replacement made from processed Bayer liquor.
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Perron, Alexandre. "Mesure de vitesse dans une solution électrolytique à force ionique élevée par une méthode électrochimique /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2003. http://theses.uqac.ca.

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Armstrong, Jennifer Ann. "The investigation of scale formation in the Bayer process." Thesis, Loughborough University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251012.

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Péloquin, Guy. "Modélisation mathématique de la décantation de boue rouge /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2003. http://theses.uqac.ca.

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Lee, Mei-yin. "The mechanism of gibbsite crystal growth in Bayer liquor." Curtin University of Technology, School of Applied Chemistry, 1998. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=10719.

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Although the precipitation of aluminium trihydroxide as gibbsite, via the Bayer process has been widely studied, the mechanism of crystal growth is poorly understood. This work focus on the morphology of gibbsite and the relative growth rates of individual crystal faces.Initial work was carried out to characterize aluminium trihydroxide and it was found that bayerite, another polymorph, precipitated at temperatures below 50 [degrees] C and its morphology depended on the method of precipitation. Gibbsite however, precipitated above this temperature and its morphology depended on the type of alkali aluminate solutions used. The method of precipitation does not affect the morphology, only the size of the precipitate formed. The morphology of gibbsite can be altered by the addition of organic compounds which are known to inhibit gibbsite precipitation. Some of these compounds were found to selectively inhibit the growth of individual crystal faces, thus altering the overall morphology of gibbsite. Boehmite, a polymorph of aluminium hydroxide, can be produced by partial dehydration of gibbsite at 300T. The morphology of boehmite consisted of diamond shaped crystals.The influence of cation incorporation on the morphology of gibbsite was studied experimentally and computationally (molecular modelling). These studies showed that there is a linear relationship between the amount of cation incorporated and atomic radii and between the amount of cation incorporated and the defect energy calculated. The equilibrium morphology of gibbsite predicted in the absence of media matched the morphology of gibbsite grown slowly from sodium aluminate, implying that the amount of sodium incorporation is low in these crystals.The growth rates of individual crystal faces were measured in situ, and found to be a function of supersaturation squared for the prismatic faces, possibly indicating ++
that E growth occurs by spiral growth mechanism. The growth of the basal face was found to follow the spiral growth mechanism below a relative supersaturation of 0.815 and the birth and spread mechanism above this level. The activation energies and kinetic coefficients for the individual prismatic faces were also determined.Growth rate dispersion was observed in these microscopic studies, but the question of size dependency remains unanswered.The overall growth rates of gibbsite crystal, determined using rapid dynamic light scattering, was found to be an exponential function of supersaturation indicative of a birth and spread growth mechanism.
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Tromans, Andrew J. "Solution chemistry of some dicarboxylate salts of relevance to the Bayer process /." Access via Murdoch University Digital Theses Project, 2003. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20040730.140604.

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Normandin, Mélanie. "Étude sur la clarification d'une suspension de boue rouge et de liqueur Bayer par floculation /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2005. http://theses.uqac.ca.

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Thèse (M.Eng.) -- Université du Québec à Chicoutimi, 2005.
La p. de t. porte en outre: Mémoire présenté à l'Université du Québec à Chicoutimi comme exigence partielle de la maîtrise en ingénierie. CaQQUQ Bibliogr.: f. 128-131. Document électronique également accessible en format PDF. CaQQUQ
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Books on the topic "Bayer Process"

1

International Light Metals Congress (8th 1988 Leoben, Styria, Austria). Bayer and Hall-Héroult process: Selected topics. Edited by Bielfeldt K and Grjotheim K. 1919-. Düsseldorf: Aluminium-Verlag, 1988.

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Reyhani, M. M. Investigations at the atomic level of interactions between gibbsite and sodium oxalate in the Bayer process. East Perth, WA: Minerals and Energy Research Institute of Western Australia, 2000.

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Malʹts, N. S. Novoe v proizvodstve glinozema po skhemam Baĭer-spekanie. Moskva: "Metallurgii︠a︡", 1989.

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Savchenko, A. I. Dekompozit͡s︡ii͡a︡ i povyshenie kachestva gidroksida ali͡u︡minii͡a︡. Moskva: "Metallurgii͡a︡", 1992.

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Norman, Ellen Claire. Studies on humic substances and humic-type substances associated with the Bayer process. Birmingham: University of Birmingham, 1997.

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Gaver, Donald Paul. Random parameter Markov population process models and their likelihood, Bayes, and empirical Bayes analysis. Monterey, Calif: Naval Postgraduate School, 1985.

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Srivastava, M. S. Optimal bayes stopping rules for detecting the change point in a bernoulli process. Toronto: University of Toronto, Dept. of Statistics, 1989.

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Gayvoronskiy, Konstantin, M. A. Nikolaeva, and tehnicheskih doktor. Labor protection in public catering and trade. ru: INFRA-M Academic Publishing LLC., 2022. http://dx.doi.org/10.12737/1817478.

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The textbook discusses the principles of safety, dangerous and harmful factors of the production environment and the labor process, the nature of their impact on the human body and the principles of rationing acceptable levels of exposure. The issues of ensuring the safety of service personnel during various technological processes and the operation of equipment at public catering and trade enterprises are highlighted. Information on labor legislation and the organization of labor protection work at enterprises is provided. Complies with the federal state educational standards of secondary vocational education of the latest generation. It is intended for students of educational institutions of secondary vocational education studying in the specialties 19.02.10 "Technology of public catering products (qualification of technician-technologist)", 38.02.05 "Commodity science and quality examination of consumer goods (qualification of commodity expert)", 38.02.04 "Commerce (by industry)". It can be used in the development of interdisciplinary courses included in the professional cycle of professions "Cook, pastry chef, baker, salesman, controller-cashier".
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United States. Congress. House. Committee on House Administration. Examining the voting process: How states can build on recommendations from the Bauer-Ginsberg Commission : hearing before the Committee on House Administration, House of Representatives, One Hundred Thirteenth Congress, second session, held in Washington, DC, July 23, 2014. Washington: U.S. Government Printing Office, 2014.

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Bayer and Hall-Heroult process: Selected topics. Aluminium-Verlag, 1988.

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Book chapters on the topic "Bayer Process"

1

Songqing, Gu. "Bayer Process Efficiency Improvement." In Light Metals 2013, 163–67. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118663189.ch29.

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Songqing, Gu. "Bayer Process Efficiency Improvement." In Light Metals 2013, 163–67. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-65136-1_29.

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Donaldson, D. J. "Perspective on Bayer Process Energy." In Light Metals 2011, 171–74. Cham: Springer International Publishing, 2011. http://dx.doi.org/10.1007/978-3-319-48160-9_29.

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Donaldson, D. J. "Perspective on Bayer Process Energy." In Essential Readings in Light Metals, 711–14. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48176-0_99.

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Donaldson, D. J. "Perspective on Bayer Process Energy." In Essential Readings in Light Metals, 711–15. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118647868.ch99.

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Oeber, Nils, and Rudolf O. Friederich. "Outlook of the Bayer Process." In Hall-Héroult Centennial, 144–53. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118788011.ch12.

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Donaldson, D. J. "Perspective on Bayer Process Energy." In Light Metals 2011, 169–74. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118061992.ch29.

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Langa, J. M., T. G. Russell, G. A. O’Neill, P. Gacka, V. B. Shah, J. L. Stephenson, and J. G. Snyder. "Aspen Modeling of the Bayer Process." In Essential Readings in Light Metals, 860–69. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48176-0_119.

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Adamson, A. N., E. J. Bloore, and A. R. Carr. "Basic Principles of Bayer Process Design." In Essential Readings in Light Metals, 100–117. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48176-0_14.

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Soucy, Gervais, Jacques E. Larocque, and Guy Forté. "Organic Control Technologies in Bayer Process." In Essential Readings in Light Metals, 291–96. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48176-0_39.

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Conference papers on the topic "Bayer Process"

1

Beavogui, Marie Constance, Boris Grigorievich Balmaev, Oumar Barou Kaba, Ahmed Amara Konaté, and Irina Viktorovna Loginova. "Bauxite enrichment process (Bayer process): Bauxite cases from Sangaredi (Guinea) and Sierra Leone." In PROCEEDINGS OF THE 16TH INTERNATIONAL CONFERENCE ON INDUSTRIAL MANUFACTURING AND METALLURGY (ICIMM 2021). AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0074812.

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Saw, Woei Lean, Ahmed Naufal, Alicia Bayon Sandoval, Andrew Beath, Keith Lovegrove, Philip van Eyk, Robbie McNaughton, Roman Bader, and Graham Nathan. "Technical feasibility of integrating concentrating solar thermal energy in the Bayer alumina process." In SOLARPACES 2019: International Conference on Concentrating Solar Power and Chemical Energy Systems. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0029572.

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De Martini, F., R. Coluzzi, and S. Di Fonzo. "Transition from Maxwell-Boltzmann to Bose-Einstein partition statistics by stochastic splitting of degenerate light." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.wq1.

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The first experimental verification of the Tersoff-Bayer interstatistics transition theory has been reported.1-3 A novel difference photon-counting method of detection, which reveals the field's particle fluctuations, is used to gain information on the beam splitting process of a highly Bose degenerate chaotic (and coherent) photon beam emitted from an ultrastable He-Ne laser. The splitting device consists of an electrooptic Pockels cell which acts as a stationary beam splitter or a chaotic beam splitter depending on the output properties of a driving noise generator. We found that the quantum Bose statistics in a splitting (i.e., scattering) process corresponds to a fully stochastic splitting process. This conclusion has been experimentally verified for two-way splitting and for general multichannel scattering induced by microscopic particles.
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Mohamed, M., R. R. Vuppalapati, S. Hawkins, K. Chandrashekhara, and T. Schuman. "Impact Characterization of Polyurethane Composites Manufactured Using Vacuum Assisted Resin Transfer Molding." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88267.

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Glass fiber reinforced composites are finding various applications due to their high specific stiffness/strength, and corrosion resistance. Vacuum assisted resin transfer molding (VARTM) is one of the commonly used low cost composite manufacturing processes. Polyurethane (PU) resin system has been observed to have better mechanical properties and higher impact strength when compared to conventional resin systems such as polyester and vinyl ester. Until recently, PU could not be used in composite manufacturing processes such as VARTM due to its low pot life. In the present work, a thermoset PU resin systems with longer pot life developed by Bayer MaterialScience is used. Glass fiber reinforced PU composites have been manufactured using one part PU resin system. Performance evaluation was conducted on these composites using tensile, flexure and impact tests. Finite element simulation was conducted to validate the mechanical tests. Results showed that PU composites manufactured using novel thermoset PU resins and VARTM process will have significant applications in infrastructure and automotive industries.
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Chen, Bochang, and V. M. Rao Tummala . "On the Solution of a Superhierarchy with a Bayes Loop." In The International Symposium on the Analytic Hierarchy Process. Creative Decisions Foundation, 1996. http://dx.doi.org/10.13033/isahp.y1996.049.

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Endow, Yasushi. "Random baker system and corresponding Markov process." In The fourth international conference on computing anticipatory systems (CASYS 2000). AIP, 2001. http://dx.doi.org/10.1063/1.1388695.

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Wu, Mingtao, Vir V. Phoha, Young B. Moon, and Amith K. Belman. "Detecting Malicious Defects in 3D Printing Process Using Machine Learning and Image Classification." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67641.

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3D printing, or additive manufacturing, is a key technology for future manufacturing systems. However, 3D printing systems have unique vulnerabilities presented by the ability to affect the infill without affecting the exterior. In order to detect malicious infill defects in 3D printing process, this paper proposes the following: 1) investigate malicious defects in the 3D printing process, 2) extract features based on simulated 3D printing process images, and 3) an experiment of image classification with one group of non-defect infill image and the other group of defect infill training image from 3D printing process. The images are captured layer by layer from the top view of software simulation preview. The data extracted from images is input to two machine learning algorithms, Naive Bayes Classifier and J48 Decision Trees. The result shows Naive Bayes Classifier has an accuracy of 85.26% and J48 Decision Trees has an accuracy of 95.51% for classification.
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Tejaswini, Oruganti, Aswath Shakthi K.P., Khadavilli Ramya Geethika, and Brindha G.R. "New Feature Selection Process to Enhance Naïve Bayes Classification." In 2018 Second International Conference on Electronics, Communication and Aerospace Technology (ICECA). IEEE, 2018. http://dx.doi.org/10.1109/iceca.2018.8474746.

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Sato, Issei, Kenichi Kurihara, and Hiroshi Nakagawa. "Practical collapsed variational bayes inference for hierarchical dirichlet process." In the 18th ACM SIGKDD international conference. New York, New York, USA: ACM Press, 2012. http://dx.doi.org/10.1145/2339530.2339550.

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Bakir, Cigdem, and Mecit Yuzkat. "Process Mining Algorithms Performance According to New Bayes Conformance Function." In 2022 26th International Conference Electronics. IEEE, 2022. http://dx.doi.org/10.1109/ieeeconf55059.2022.9810387.

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Reports on the topic "Bayer Process"

1

Kuo, Lynn. A Note on Bayes Empirical Bayes Estimation by Means of Dirichlet Processes. Fort Belvoir, VA: Defense Technical Information Center, September 1985. http://dx.doi.org/10.21236/ada170039.

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Walsh, Daniel C., and Adrian E. Raftery. Classification of Mixtures of Spatial Point Processes via Partial Bayes Factors. Fort Belvoir, VA: Defense Technical Information Center, January 2003. http://dx.doi.org/10.21236/ada459757.

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Pautz Stephenson, Stefani, Rebecca Banks, and Merijke Coenraad. Outcomes of Increased Practitioner Engagement in Edtech Development: How Strong, Sustainable Research-Practice-Industry Partnerships will Build a Better Edtech Future. Digital Promise, June 2022. http://dx.doi.org/10.51388/20.500.12265/158.

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A new participatory research model, Research-Practice-Industry Partnerships (RPIP), presents a unique value proposition. Design processes have typically placed professional designers, not the end users, at the center of the work. RPIPs create an intentional feedback loop that transforms the knowledge, action, or goals of all involved parties (Baker et al., 2022). RPIP aims to create better designs for scalable technologies that both meet the needs of educators and incorporate research from the learning sciences. This yields a product more likely to be used, used appropriately, and have the desired impact for learners. Digital Promise partnered with edtech startup Merlyn Mind and the University of California, Irvine (UCI) in an RPIP. This white paper describes our engagement and suggests that this model can yield positive impacts and new learning for all participants. Surveys and interviews with participants showed that engagement was mutually valued among all parties, practitioners learned more about AI and edtech in general, and Merlyn Mind staff learned more about working with schools and educators. Practitioners also benefited from the networking and collaboration that participation in the RPIP brought and felt it helped them grow professionally.
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McPhedran, R., K. Patel, B. Toombs, P. Menon, M. Patel, J. Disson, K. Porter, A. John, and A. Rayner. Food allergen communication in businesses feasibility trial. Food Standards Agency, March 2021. http://dx.doi.org/10.46756/sci.fsa.tpf160.

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Background: Clear allergen communication in food business operators (FBOs) has been shown to have a positive impact on customers’ perceptions of businesses (Barnett et al., 2013). However, the precise size and nature of this effect is not known: there is a paucity of quantitative evidence in this area, particularly in the form of randomised controlled trials (RCTs). The Food Standards Agency (FSA), in collaboration with Kantar’s Behavioural Practice, conducted a feasibility trial to investigate whether a randomised cluster trial – involving the proactive communication of allergen information at the point of sale in FBOs – is feasible in the United Kingdom (UK). Objectives: The trial sought to establish: ease of recruitments of businesses into trials; customer response rates for in-store outcome surveys; fidelity of intervention delivery by FBO staff; sensitivity of outcome survey measures to change; and appropriateness of the chosen analytical approach. Method: Following a recruitment phase – in which one of fourteen multinational FBOs was successfully recruited – the execution of the feasibility trial involved a quasi-randomised matched-pairs clustered experiment. Each of the FBO’s ten participating branches underwent pair-wise matching, with similarity of branches judged according to four criteria: Food Hygiene Rating Scheme (FHRS) score, average weekly footfall, number of staff and customer satisfaction rating. The allocation ratio for this trial was 1:1: one branch in each pair was assigned to the treatment group by a representative from the FBO, while the other continued to operate in accordance with their standard operating procedure. As a business-based feasibility trial, customers at participating branches throughout the fieldwork period were automatically enrolled in the trial. The trial was single-blind: customers at treatment branches were not aware that they were receiving an intervention. All customers who visited participating branches throughout the fieldwork period were asked to complete a short in-store survey on a tablet affixed in branches. This survey contained four outcome measures which operationalised customers’: perceptions of food safety in the FBO; trust in the FBO; self-reported confidence to ask for allergen information in future visits; and overall satisfaction with their visit. Results: Fieldwork was conducted from the 3 – 20 March 2020, with cessation occurring prematurely due to the closure of outlets following the proliferation of COVID-19. n=177 participants took part in the trial across the ten branches; however, response rates (which ranged between 0.1 - 0.8%) were likely also adversely affected by COVID-19. Intervention fidelity was an issue in this study: while compliance with delivery of the intervention was relatively high in treatment branches (78.9%), erroneous delivery in control branches was also common (46.2%). Survey data were analysed using random-intercept multilevel linear regression models (due to the nesting of customers within branches). Despite the trial’s modest sample size, there was some evidence to suggest that the intervention had a positive effect for those suffering from allergies/intolerances for the ‘trust’ (β = 1.288, p<0.01) and ‘satisfaction’ (β = 0.945, p<0.01) outcome variables. Due to singularity within the fitted linear models, hierarchical Bayes models were used to corroborate the size of these interactions. Conclusions: The results of this trial suggest that a fully powered clustered RCT would likely be feasible in the UK. In this case, the primary challenge in the execution of the trial was the recruitment of FBOs: despite high levels of initial interest from four chains, only one took part. However, it is likely that the proliferation of COVID-19 adversely impacted chain participation – two other FBOs withdrew during branch eligibility assessment and selection, citing COVID-19 as a barrier. COVID-19 also likely lowered the on-site survey response rate: a significant negative Pearson correlation was observed between daily survey completions and COVID-19 cases in the UK, highlighting a likely relationship between the two. Limitations: The trial was quasi-random: selection of branches, pair matching and allocation to treatment/control groups were not systematically conducted. These processes were undertaken by a representative from the FBO’s Safety and Quality Assurance team (with oversight from Kantar representatives on pair matching), as a result of the chain’s internal operational restrictions.
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In-depth survey report: process evaluation at Baker Boy. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, September 2011. http://dx.doi.org/10.26616/nioshephb32213a.

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