Relevant bibliographies by topics / Ansa

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

Academic literature on the topic 'Ansa'

Author: Grafiati
Published: 4 June 2021
Last updated: 27 April 2022

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Journal articles on the topic "Ansa"

1

Schröder, Günther. "ANSA." Revue Générale Nucléaire, no. 4 (July 1990): 322–23. http://dx.doi.org/10.1051/rgn/19904322.

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Volwerk, Martin. "On the location of the Io plasma torus: Voyager 1 observations." Annales Geophysicae 36, no. 3 (2018): 831–39. http://dx.doi.org/10.5194/angeo-36-831-2018.

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Abstract. The Voyager 1 outbound ultraviolet observations of the Io plasma torus are used to determine the location of the ansae, to obtain a third viewing angle of this structure in the Jovian magnetosphere. At an angle of -114∘ with respect to the Sun–Jupiter line, or a Jovian local time of 04:30 LT, the Voyager 1 data deliver a distance of 5.74±0.10 RJ for the approaching and 5.83±0.15 RJ for the receding ansa. Various periodicities in the radial distance, brightness and width of the ansae are seen with respect to system III longitude and Io phase angle. The torus ribbon feature does not appear in all ansa scans. Keywords. Magnetospheric physics (magnetosphere interactions with satellites and rings)
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Ragunathan, Karthik, Daniel Martin, and Srinivas Puli. "Ansa Pancreatica." American Journal of Gastroenterology 109 (October 2014): S306. http://dx.doi.org/10.14309/00000434-201410002-01029.

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Schomburg, Dietmar, Marion Thielmann, and Ekkehard Winterfeld. "Ansa-Steroids." Tetrahedron Letters 26, no. 14 (1985): 1705–6. http://dx.doi.org/10.1016/s0040-4039(00)98316-3.

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Olry, Régis, and Duane E. Haines. "Ansa Hypoglossi or Ansa Cervicalis? That is the Question." Journal of the History of the Neurosciences 11, no. 3 (2002): 302–4. http://dx.doi.org/10.1076/jhin.11.3.302.10385.

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Churakov, A. V., I. E. Nifant'ev, I. F. Urazovskii, G. I. Nikonov, D. S. Yufit, and Yu T. Struchkov. "Synthesis and properties of ansa-titano- and ansa-zirconocenes." Russian Chemical Bulletin 42, no. 5 (1993): 928–31. http://dx.doi.org/10.1007/bf00698963.

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Wochner, Franz, and Hans H. Brintzinger. "ansa-metallocene derivatives." Journal of Organometallic Chemistry 309, no. 1-2 (1986): 65–75. http://dx.doi.org/10.1016/s0022-328x(00)99574-3.

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Schäfer, Andrea, Eberhard Karl, Laszlo Zsolnai, Gottfried Huttner, and Hans-Herbert Brintzinger. "ansa-Metallocene derivatives." Journal of Organometallic Chemistry 328, no. 1-2 (1987): 87–99. http://dx.doi.org/10.1016/s0022-328x(00)99770-5.

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Damrau, Hans-Robert H., Armin Geyer, Marc-Heinrich Prosenc, Armin Weeber, Frank Schaper, and Hans-Herbert Brintzinger. "ansa-Metallocene derivatives." Journal of Organometallic Chemistry 553, no. 1-2 (1998): 331–43. http://dx.doi.org/10.1016/s0022-328x(97)00618-9.

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Herbert, A. "An ANSA overview." IEEE Network 8, no. 1 (1994): 18–23. http://dx.doi.org/10.1109/65.260069.

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Dissertations / Theses on the topic "Ansa"

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Bailey, Nigel J. "ANSA bridged metallocene chemistry of niobium." Thesis, University of Oxford, 1998. http://ora.ox.ac.uk/objects/uuid:9bd76a85-ba44-42d8-affe-317bc98be368.

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This thesis is concerned with the synthesis and characterisation of new ansa bridged bis-η-cyclopentadienyl derivatives of niobium. Chapter 1 provides an introduction to the area of early transition metal bent metallocene derivatives and charts the development of ansa bridged metallocenes. Chapter 2 presents the synthesis and characterisation of some new ansa niobocene derivatives prepared from niobium(IV) chloride. The compounds [Nb(η-C<sub>5</sub>H<sub>4</sub>-CMe<sub>2</sub>- η-C<sub>5</sub>H<sub>4</sub>)(η<sup>2</sup>-BH<sub>4</sub>)],* [Nb(η-C<sub>5</sub>H<sub>4</sub>-CMe<sub>2</sub>-η-C<sub>5</sub>H<sub>4</sub>)(PMe3)H],* [Nb(η-C<sub>5</sub>H<sub>4</sub>-CMe<sub>2</sub>-η- C<sub>5</sub>H<sub>4</sub>)(PPh<sub>3</sub>)H], [Nb(η-C<sub>5</sub>H<sub>4</sub>-CMe<sub>2</sub>-η-C<sub>5</sub>H<sub>4</sub>)(SPh)<sub>2</sub>] and [Nb(η-C<sub>5</sub>H<sub>4</sub>-CMe<sub>2</sub>-η- C<sub>5</sub>H<sub>4</sub>)(CH2Ph)2]* are described. An asterisk indicates that the X-ray crystal structure was determined. Chapter 3 describes the synthesis and characterisation of some ansa niobocene derivatives containing ancillary imido ligands. The compounds [Nb(η-C<sub>5</sub>H<sub>4</sub>-CMe<sub>2</sub>-η- C<sub>5</sub>H<sub>4</sub>)(NSiMe<sub>3</sub>)Cl],* [Nb(η-C<sub>5</sub>H<sub>4</sub>-CMe<sub>2</sub>-η-C<sub>5</sub>H<sub>4</sub>)(NBu')X] (X = Cl,* Br,* I,* Me), [Nb(η-C<sub>5</sub>H<sub>4</sub>-CMe<sub>2</sub>-η-C<sub>5</sub>H<sub>4</sub>)(NHBu')Cl][BF<sub>4</sub>)]and[Nb(η-C<sub>5</sub>H<sub>4</sub>-CMe<sub>2</sub>-η-C<sub>5</sub>H<sub>4</sub>)(O)Cl]* are described. An asterisk indicates that the X-ray crystal structure was determined. Photoelectron spectra were recorded for [Nb(η-C<sub>5</sub>H<sub>4</sub>-CMe<sub>2</sub>-η-C<sub>5</sub>H<sub>4</sub>)(NBu')X] (X = Cl, Me) and compared to a geometry optimisation calculation obtained using density functional theory. In these formally twenty electron compounds the HOMO has negligible metal contribution and the eighteen electron rule is not violated. Chapter 4 describes the results of a preliminary investigation into ansa niobium(III) bis-η-cyclopentadienyl derivatives containing phosphorus donor ligands. The compound [Nb(η-C<sub>5</sub>H<sub>4</sub>-CMe<sub>2</sub>-η-C<sub>5</sub>H<sub>4</sub>)(PMe<sub>3</sub>)Cl] is characterised spectroscopically. The synthesis and full characterisation details of the compound [Nb(η-C<sub>5</sub>H<sub>4</sub>-CMe<sub>2</sub>-η- C<sub>5</sub>H<sub>4</sub>){P(OMe)<sub>3</sub>}Cl] are given, including the X-ray crystal structure. Chapter 5 provides the experimental details for the preceding Chapters and Chapter 6 contains the characterising data for the new compounds described in this thesis. Full details of the X-ray crystallographic structure determinations are given in Appendices A -1.
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Popham, Neil Andrew. "Studies on binuclear ansa-metallocene transition metal complexes." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318628.

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Ribeiro, Gonçalo Velez. "Plano de marketing para a empresa ANSA, SA." Master's thesis, Instituto Superior de Economia e Gestão, 2014. http://hdl.handle.net/10400.5/7725.

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Mestrado em Marketing<br>Num ambiente marcado por uma competitividade cada vez mais agressiva, por uma revolução tecnológica acelerada, pela globalização e por um contexto de crise nacional e internacional, as empresas confrontam-se com a necessidade de reagir e encontrar melhores formas de atuação que lhes permita diferenciarem-se da concorrência. O presente projeto visou a elaboração de um Plano Marketing para uma empresa de média dimensão que trabalha exclusivamente em contexto business-to-business. Por questões de confidencialidade, não será revelado o nome da empresa, adiante designada ?ANSA?, nem os dos seus clientes e concorrentes. A ANSA dedica-se à criação, produção e comercialização de ferragens destinadas a caixilharia de janelas e portas de alumínio. Pretende-se que o Plano de Marketing oriente a abordagem da empresa ao mercado rumo ao desenvolvimento do negócio, através de estratégias que permitam reforçar a sua presença no mercado interno, a sua relação com os clientes atuais e uma posição de destaque na mente de potenciais clientes, bem como alcançar uma melhor prestação de forma a superar os concorrentes. Numa perspetiva de gestão integrada, espera-se que o marketing venha a assumir um papel central na gestão da empresa através da implementação do plano proposto, cujas ações se pretende venham a resultar numa mudança no comportamento do mercado favorável à empresa.<br>In an environment marked by increasing aggressive competitiveness, accelerated technological revolution, globalization, and the context of national e international crisis we have been experiencing, companies face the need to react and to find better approaches to enable them to differentiate from their competitors. This final project aims to develop a Marketing Plan for a medium-sized company working exclusively in business-to-business' context. For confidentiality reasons, the name of the company, hereinafter referred to as "ANSA", as well as their customers and competitors, will not be disclosed. ANSA dedicates to the creation, production and marketing of hardware for door and window aluminum frames. The Marketing Plan is intended to guide the approach of the company to the market viewing the business development through the implementation of strategies to strengthen its presence in the domestic market, to reinforce its relationship with existing customers and to gain a prominent position in the mind of potential customers, as well as to achieve a higher delivery of services in order to beat its competitors. From an integrated management perspective, marketing is expected to take a central role in the management of the company through the implementation of the proposed plan, whose actions are intended to result in a favorable market behavior change.
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Zehnder, Ralph. "Polynuclear metallocene complexes incorporating ansa-chromocene and ferrocene units." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=96652683X.

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Jardine, Christian N. "Density functional studies of ansa-metallocenes and related compounds." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325922.

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Beagley, Paul. "Ansa-titanocenes for enantioselective reduction of C=X bonds." Thesis, University of Sheffield, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.557602.

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Conway, Stephen L. J. "Structure reactivity relationships in metallocene chemistry : the ansa-effect." Thesis, University of Oxford, 2000. http://ora.ox.ac.uk/objects/uuid:3a155469-19c6-4fbc-b77a-d24f8b27456e.

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This thesis is concerned with structure-reactivity relationships in metallocene chemistry. In particular new ansa-metallocenes of Groups 5-7 have been prepared. The structure and reactivity of these ansa-metallocenes is compared to the corresponding nonbridged metallocenes.
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Souter, Joanne. "The chemistry of ansa-bridged derivatives of molybdenum and tungsten." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320799.

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Diamond, Gary M. "ANSA-bridged and binuclear metallocene compounds of zirconium and hafnium." Thesis, University of Oxford, 1994. http://ora.ox.ac.uk/objects/uuid:297bc125-5270-4969-89c3-69fd326e5c02.

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This thesis describes the synthesis and characterisation of new mononuclear and binuclear zirconium and hafnium compounds containing ansa-bridged ligands. Some olefin polymerization studies, employing the new compounds as catalysts, are also presented. <strong>Chapter 1</strong> begins with an introduction to Ziegler-Natta polymerization of olefins, concentrating on recently developed metallocene-based catalyst systems. The second part of the Chapter charts the development of group 4 ansa-metallocene derivatives, especially their use as stereospecific catalysts. Finally, a review of binuciear group 4 metallocene compounds containing bridging bis(cyclopentadienyl)-type ligands is presented. <strong>Chapter 2</strong> describes the synthesis and characterisation of some novel mononuclear metallocene compounds of zirconium and hafnium containing ansa-bridged ligands. The ansa-bridged mononuclear compounds [{Me<sub>2</sub>C(η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>)(η<sup>2</sup>-C<sub>9</sub>H<sub>6</sub>)}M(η<sup>5</sup>C<sub>5</sub>H<sub>5</sub>)Cl] (M = Zr, Hf), [{(CH<sub>2</sub>)<sub>5</sub>C(η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>)(η<sup>2</sup>-C<sub>9</sub>H<sub>6</sub>)}M(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)Cl] (M = Zr, Hf) and [{Me<sub>2</sub>(η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>)(η<sup>3</sup>-C<sub>13</sub>H<sub>8</sub>)}Zr(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)Cl] are described, along with the X-ray crystal structures of the zirconium compounds. The η<sup>2</sup>-indenyl and η<sup>3</sup>-fluorenyl coordination modes observed for these compounds are unprecedented. The synthesis and characterisation of the novel, mononuclear ansa-bridged compounds [{Me<sub>2</sub>C(η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>)<sub<2</sub>}M(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)Cl] (M = Zr, Hf) is also described, along with their X-ray crystal structures. The variable temperature solid state <sup>13</sup>C CP/MAS NMR spectra of [{Me<sub>2</sub>C(η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>)<sub<2</sub>}M(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)Cl] (M = Zr, Hf) show slow rotation of the C<sub>5</sub>H<sub>5</sub> ring on the NMR timescale. <strong>Chapter 3</strong> describes the synthesis and characterisation of some novel homo- and hetero-binuclear metallocene compounds of zirconium and hafnium in which the metals are bridged by an unsymmetrical ansa ligand. The novel, chiral homobinuclear compounds [(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)MCl<sub>2</sub>{(η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>)CMe<sub>2</sub>(η<sup>5</sup>-C<sub>9</sub>H<sub>6</sub>)}MCl<sub>2</sub>(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)] (M = Zr, Hf) are described. The ansa-bridged mononuclear compounds [{Me<sub>2</sub>C(η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>)(η<sup>2</sup>-C<sub>9</sub>H<sub>7</sub>)M(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)Cl] (M = Zr, Hf) are used as reagents for the selective synthesis of the heterobinuclear analogues [(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)MCl<sub>2</sub>{(η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>)CMe<sub>2</sub>(η<sup>5</sup>-C<sub>9</sub>H<sub>6</sub>)}M*Cl<sub>2</sub>(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)] (M = Zr, M* = Hf ; M = Hf, M* = Zr) and the unsymmetrical homobinuclear compound [(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)ZrCl<sub>2</sub>{(η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>)CMe<sub>2</sub>(��<sup>5</sup>-C<sub>9</sub>H<sub>6</sub>)}ZrCl<sub>2</sub>(η<sup>5</sup>-C<sub>5</sub>Me<sub>5</sub>)]. The methylated derivatives [(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)M(CH<sub>3</sub>)<sub>2</sub>{(η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>)CMe<sub>2</sub>(η<sup>5</sup>-C<sub>5</sub>H<sub>6</sub>)}M*(CH<sub>3</sub>)<sub>2</sub>(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)] (M = Zr, M* = Zr, Hf; M = Hf, M* = Zr, Hf) are also described. The structurally related mononuclear compounds [(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)MCl<sub>2</sub>{(η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>)CMe<sub>2</sub>(C<sub>9</sub>H<sub>7</sub>)}] (M = Zr, Hf) and [(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)Zr(CH<sub>3</sub>)<sub>2</sub>{(η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>)CMe<sub>2</sub>(C<sub>9</sub>H<sub>7</sub>)}] have also been prepared. <strong>Chapter 4</strong> presents some olefin polymerization studies using the new compounds described in Chapter 3 as catalysts, along with either methylaluminoxane or the recently developed co-catalysts [Ph<sub>3</sub>C]<sup>+</sup>[B(C<sub>6</sub>F<sub>5</sub>)<sub>4</sub>]<sup>-</sup> and B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>. <strong>Chapter 5</strong> provides the experimental details for the reactions described in this thesis and the characterising data for all new compounds are given in <strong>Chapter 6</strong> Crystallographic data for the for the X-ray structure determinations in Chapter 2 are given in the <strong>Appendices</strong>.
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EL, BAKILI ABDELAZIZ. "Cyclophosphazenes porteurs de macrocycles oxodiamino en configuration spiro ou ansa." Toulouse 3, 1989. http://www.theses.fr/1989TOU30085.

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La reaction de polyoxodiamines avec n#3p#3cl#6 donne des structures monocyclophosphazeniques dans lesquelles les ligands oxodiamino sont greffes sur le cycle n#3p#3 dans des configurations spiro ou ansa macrocycliques. Etude par diffraction rx
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Books on the topic "Ansa"

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Tănsănică, George. Ansa. Junimea, 1999.

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Parvela, Timo. Ansa & Oiva. W. Söderström, 1999.

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Andonegi, Blanka. Karlos Santamaria Ansa. Eusko Ikaskuntza = Sociedad de Estudios Vascos, 1995.

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Burger, Peter. Symmetrisch substituierte C₂-verbrückte ansa-Metallocene. Hartung-Gorre Verlag, 1991.

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Zembylas, Tasos, and Peter Tschmuck. Kulturbetriebsforschung: Ansa tze und Perspektiven der Kulturbetriebslehre. VS Verlag fu r Sozialwissenschaften/GWV Fachverlage GmbH, Wiesbaden, 2006.

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ANSA: Analisi etnografica di un'agenzia di stampa. Carocci, 2009.

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Reeh, Tobias. Orte, Wege, Visionen: Aktuelle Ansa tze der Tourismusgeographie. Univ.-Verl. Go ttingen, 2011.

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Casa Ansa: Da settant'anni il diario del paese. Centro di documentazione giornalistica, 2014.

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Schulz, Winfried. Politische Kommunikation: Theoretische Ansa tze und Ergebnisse empirischer Forschung. 3rd ed. VS Verlag fu r Sozialwissenschaften, 2011.

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Mietzner, Dana. Strategische Vorausschau und Szenarioanalysen: Methodenevaluation und neue Ansa tze. Gabler, 2009.

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Book chapters on the topic "Ansa"

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Olry, Régis, and Duane E. Haines. "Ansa Hypoglossi or Ansa Cervicalis? That is the Question ..." In Rhinencephalon, Tabes dorsalis and Elpenor's Syndrome. Routledge, 2021. http://dx.doi.org/10.4324/9781003125662-13.

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Porter, Kristin K. "Case 99: Ansa Pancreatica." In Pancreatic Imaging. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52680-5_99.

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Smith, Marshall E. "Pediatric Ansa Cervicalis to Recurrent Laryngeal Nerve Anastomosis." In Advances in Oto-Rhino-Laryngology. S. KARGER AG, 2012. http://dx.doi.org/10.1159/000334443.

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Romano, Luigia. "Aneurisma dell’arteria iliaca destra fistolizzato in ansa di tenua." In Protocolli di studio in TC spirale multistrato. Springer Milan, 2010. http://dx.doi.org/10.1007/978-88-470-1572-2_9.

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Brintzinger, Hans H., and David Fischer. "Development of ansa-Metallocene Catalysts for Isotactic Olefin Polymerization." In Advances in Polymer Science. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/12_2013_215.

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Brandt, Josef. "The ANSA Matrix, a Useful Tool for Coding Cyclization Reactions." In Chemical Structures 2. Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78027-1_38.

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Fogarolli, Angela, George Giannakopoulos, and Heiko Stoermer. "Entity Popularity on the Web: Correlating ANSA News and AOL Search." In Artificial Intelligence: Methodology, Systems, and Applications. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15431-7_15.

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Steiner, H. H., M. S. von Haken, H. G. Steiner Milz, F. K. Albert, and J. Hamer. "The Ansa Cervicalis Hypoglossal — Facial Anastomosis for Indirect Facial Nerve Reconstruction." In Advances in Neurosurgery. Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-77997-8_47.

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Nedorezova, Polina M., Valentina I. Tsvetkova, Alexander M. Aladyshev, Dmitrii V. Savinov, and Dmitrii A. Lemenovskii. "The Particularities of Isospecific Polypropylene Synthesis in Bulk with Ansa-metallocene Catalysts." In Organometallic Catalysts and Olefin Polymerization. Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59465-6_23.

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Ferrari, Adriano, Sandro Reverberi, and Maria Grazia Benedetti. "Anca sublussata, anca lussata, anca instabile." In L’arto inferiore nella paralisi cerebrale infantile. Springer Milan, 2013. http://dx.doi.org/10.1007/978-88-470-2814-2_22.

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Conference papers on the topic "Ansa"

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Herbert, Andrew. "ANSA and open distributed processing." In IEE Third Tutorial Seminar on `The Intelligent Network - The Next Generation'. IEE, 1995. http://dx.doi.org/10.1049/ic:19950696.

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Evers, David, and Peter Robinson. "Modula-3 network objects over ANSA." In the 5th workshop. ACM Press, 1992. http://dx.doi.org/10.1145/506378.506398.

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Metz, C., A. Lois, and S. Veldhoen. "Ansa pancreatica: zwei Varianten einer seltenen Pankreasganganomalie." In 101. Deutscher Röntgenkongress und 9. Gemeinsamer Kongress der DRG und ÖRG. © Georg Thieme Verlag KG, 2020. http://dx.doi.org/10.1055/s-0040-1703482.

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Skaperdas, Vangelis, and Neil Ashton. "Development of high-quality hybrid unstructured meshes for the GMGW-1 workshop using ANSA." In 2018 AIAA Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-0660.

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Sanders, Charlotta E. "Development of Buildup Factors for Updating the ANSI/ANS-6.4.3 Standard." In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-30212.

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The ANSI/ANS-6.4.3-1991 Standard, Gamma-Ray Attenuation Coefficients and Buildup Factors for Engineering Materials, is currently being updated by an American Nuclear Society (ANS) Working Group. The ANSI/ANS-6.4.3, 1991 standard, which is “withdrawn” due to the failure to meet the requirement of the ANS to have standards updated every ten years, contains buildup factor values that are derived from data that is over seventeen years old. In addition, computer technology has significantly improved since 1991, allowing for more complicated, computationally demanding codes to be utilized. Therefore, the ANSI/ANS-6.4.3-1991 standard is being re-visited to include updated data and to include modern codes. Gamma-ray buildup factors and attenuation coefficients are being generated for common shielding materials (e.g., concrete, steel, water, etc.) utilizing the ENDF/B-VI.8 cross-section data library, which is distributed by Brookhaven National Laboratory’s National Nuclear Data Center (NNDC). One modern code, Monte Carlo N-Particle (MCNP5/MCNPX), is being compared with PALLAS-1D (VII) and Anisotropic Source-Flux Iteration Technique (ASFIT-VARI), which were used to develop values included in ANSI/ANS-6.4.3-1991. PALLAS-1D (VII) is a code for direct integration of transport equation in one-dimensional plane and spherical geometries while ASFIT-VARI is a gamma-ray transport code system for one-dimensional finite systems. MCNP5 is a general purpose Monte Carlo radiation transport code that tracks particles (e.g., neutron and photons) at numerous energies in a three dimensional configuration of materials. The MCNP5 radiation transport code require response function input to provide dose and exposure output. Mass energy-absorption coefficients and mass energy-transfer coefficients are required to develop absorbed dose and exposure responses. The National Institute of Standards and Technology (NIST) provide and maintain the most up-to-date mass energy-absorption coefficient and mass energy-transfer coefficient database currently available. The NIST values are used in these initial buildup factor calculations to prove the validity of the methodology used and allow for preliminary comparisons. The energy absorption (dose in material) and exposure buildup factors are calculated at mfp values of interest, consistent with ANSI/ANS-6.4.3-1991 up to forty mfp. Comparisons between the new buildup factors and the previous results presented in the ANSI/ANS-6.4.3-1991 standard indicate that there is fairly good agreement. Differences in buildup factor values can be attributed to differences in cross-section data libraries, numerical methods, and physics treatments within the respective codes.
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Williamson, B. "ANSI/ANS-8.7 Applications for the Storage of Criticality Control Overpacks." In Transactions - 2020 Virtual Conference. AMNS, 2020. http://dx.doi.org/10.13182/t122-32340.

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Williamson, B. "ANSI/ANS-8.7 Applications for the Storage of Criticality Control Overpacks." In Transactions - 2020 Virtual Conference. AMNS, 2020. http://dx.doi.org/10.13182/t32340.

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Sharma, Aman, Yogesh Chander, Manish Rathi, et al. "FRI0649 PREVALENCE OF ANCA AND ANA IN PATIENTS WITH PULMONARY TUBERCULOSIS." In Annual European Congress of Rheumatology, EULAR 2019, Madrid, 12–15 June 2019. BMJ Publishing Group Ltd and European League Against Rheumatism, 2019. http://dx.doi.org/10.1136/annrheumdis-2019-eular.4485.

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Verma, Navni N., Andrei Iacob, Sandip Mazumder, and Ahmet Selamet. "Experimental and Computational Study of Flow and Heat Transfer Around a Surrogate Engine Mount." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70580.

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An experimental and computational investigation is conducted on the flow and heat transfer characteristics on and around a surrogate engine mount. The engine mount in an automobile is often in the close proximity of the catalytic converter, and may be subjected to considerable thermal radiation, combined with thermal conduction from the engine block through its bracket. The objective of this study is to develop a validated model that is capable of accurately predicting the temperature distribution on the mount. Two sets of heaters were implemented in the present study, both with controllable temperatures: band heaters to approximate the catalytic converter and cartridge heaters to represent the effect of the engine block at the bracket base. Carefully controlled experiments were first conducted with fixed heater temperatures, air flow rates, and bracket (at the base of the mount) temperatures. The temperatures were recorded at 22 different locations along the mount surface and the mount bracket for all input conditions. A computational fluid dynamics (CFD) model was next developed to simulate the same experiments. The simulations were conducted using roughly 5–6 million control volume (cells). The mesh was generated using ANSA™ and parallel computations of the governing equations were conducted using Ansys-Fluent™. For the broad matrix of cases considered, average predicted temperatures were found to agree with experimentally measured temperature to within 10°C (out of 300°C total variation), while local temperatures were found to agree within 10%.
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Verma, Navni N., Andrei Iacob, Sandip Mazumder, and Ahmet Selamet. "Combined Computational and Experimental Analysis of Cooldown of a Surrogate Engine Mount Assembly." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87139.

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A combined computational/ experimental analysis is conducted to investigate the cooldown behavior of a surrogate engine mount assembly. The engine mount in an automobile is often in the close proximity of the catalytic converter, and may heat up significantly during operation of the vehicle. When the vehicle is parked after operation, the mount cools due to heat loss by natural convection and radiation. The objective of this study is to develop a model that is capable of accurately predicting the spatio-temporal evolution of the mount temperature during this cooldown process. Carefully controlled experiments were first conducted, during which temperatures were recorded at 41 different locations. A Computational Fluid Dynamics (CFD) model that includes natural convection and radiation was next developed to simulate the same experiments. The simulations were conducted using roughly 5–6 million control volume (cells). The mesh was generated using ANSA™ and parallel computations of the governing equations were conducted using Ansys-Fluent™. The CFD results were found to agree with the measured temperatures to within a few tens of degrees. The discrepancies may be attributed to differences in initial conditions (measured versus numerical) and due to the fact that thermal contact resistances were neglected. However, the study revealed that to obtain reasonably close agreement, one must use very small time step sizes — small enough to sufficiently resolve the rapidly changing unsteady natural convection patterns — making such computations extremely time-consuming.
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Reports on the topic "Ansa"

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McCallum, Jacob Bryan, Alexander Barton Brown, and James J. Kuropatwinski. ANSI/ANS-8 Criticality Safety Standards. Office of Scientific and Technical Information (OSTI), 2020. http://dx.doi.org/10.2172/1583138.

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Wright, R. Q., J. P. Renier, and J. A. Bucholz. ANSL-V: ENDF/B-V based multigroup cross-section libraries for Advanced Neutron Source (ANS) reactor studies. Supplement 1. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/205673.

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Swank, Morgan. Parachute Dress for Anna. Iowa State University, Digital Repository, 2013. http://dx.doi.org/10.31274/itaa_proceedings-180814-736.

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Hoffman, Michael. Anna Held, a biography. Portland State University Library, 2000. http://dx.doi.org/10.15760/etd.3177.

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Cook, Chris B., Lance W. Vail, and Duane L. Ward. North Anna Early Site Permit Water Budget Model (LakeWBT) for Lake Anna. Office of Scientific and Technical Information (OSTI), 2005. http://dx.doi.org/10.2172/15010729.

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Ford, W. E. III, J. W. Arwood, N. M. Greene, et al. Advanced Neutron Source Cross Section Libraries (ANSL-V): ENDF/B-V based multigroup cross-section libraries for advanced neutron source (ANS) reactor studies. Office of Scientific and Technical Information (OSTI), 1990. http://dx.doi.org/10.2172/6502303.

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Nichols, Judith J. The De Anza Primer: A Basic Introduction to the De Anza Graphics Display. Defense Technical Information Center, 1987. http://dx.doi.org/10.21236/ada179798.

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Kenney, John J., and Walter Mann. Anna Package Specification: Case Studies. Defense Technical Information Center, 1991. http://dx.doi.org/10.21236/ada311117.

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Marchbanks, M. F. ANS materials databook. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/204266.

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Mann, Walter. Anna Package Specification Analyzer User Guide. Defense Technical Information Center, 1993. http://dx.doi.org/10.21236/ada311118.

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