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Relevant bibliographies by topics / Borazin

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Academic literature on the topic 'Borazin'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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Journal articles on the topic "Borazin"

1

Gemünd, Birgit, Berndt Günther, Jörg Knizek, and Heinrich Nöth. "N-(2,4,6-Trimethylborazinyl)-substituted Boron, Aluminum and Titanium Compounds." Zeitschrift für Naturforschung B 63, no. 1 (January 1, 2008): 23–36. http://dx.doi.org/10.1515/znb-2008-0105.

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The N-lithioborazine LiH2N3B3Me3, 1, reacts with organoboron halides not only to the respective borazinyl organylboranes but also by Me/halogen exchange. (Me2N)2B-H2N3B3Me3 was obtained from 1 and (Me2N)2BCl. A new ten-membered B6N4 ring system, 5, results on treatment of Cl(Me2N)B-B(NMe2)Cl with 1. The B-N-borazinyl borazines 6 - 8 can be prepared from 1 and B-monohalo borazines. The synthesis of 2,4,6-trimethylborazinyl-aluminum and -titanium compounds is achieved only with mononuclear monohalides of Al(III) and Ti(IV). The 2,4,6-trimethylborazinyl- bis(piperidino)alane 9 and the tris(2,6-diisopropylphenoxo)-2,4,6-trimethylborazinyltitanium 10 were characterized by X-ray structure analysis. The distortion of the borazine ring by B and N substitution is discussed. In case of the N-substituted borazines YH2N3B3Me3 the B-N bonds of the YNB2 units are elongated, e. g. for Y = PBr2 or (RO)3Ti, while N lithiation leads to a shortening of these B-N bond. These changes of bond lengths are also reflected by changes in the B1-N2 and B3-N3 bond lengths which become shorter in the presence of electron-withdrawing groups, but longer in case of Li substitution. Also, the bond angles B1-N2-B2 and B2-N3-B3 are affected by an increase of up to 128°.

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Gates, Derek P., Ralf Ziembinski, Arnold L. Rheingold, Brian S. Haggerty, and Ian Manners. "Synthese und Struktur des ersten Heterocyclus mit Borazin- und Cyclophosphazen-Teilstruktur." Angewandte Chemie 106, no. 22 (November 21, 1994): 2367–69. http://dx.doi.org/10.1002/ange.19941062208.

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Paetzold, Peter, Jutta Kiesgen, Karl Krahé, Hans-Ulrich Meier, and Roland Boese. "Ringerweiterungs- und -verengungsreaktionen bei BN-Vier- und -Sechsringen / Expansion and Contraction Reactions with BN Four- and Six-Membered Rings." Zeitschrift für Naturforschung B 46, no. 7 (July 1, 1991): 853–60. http://dx.doi.org/10.1515/znb-1991-0703.

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By the addition of iminoboranes RB≡NR′ (1a—d) to the corresponding diazadiboretidines (RBNR′)2 (2a—d), a ring expansion is observed, borazines (RBNR′)3 (3a—d) being formed. The particular iminoborane iPrB≡NiPr (la) can be added to the diazadiboretidines 2c—g to give borazines B3N3R2R′2iPr2 with an unsymmetrical set of ligands. From PhB=NtBu (1j) and (PhBNtBu)2 (2j), the Dewar borazine 3j′ is formed, which crystallizes in the space group P2,/c. The diazadiboretidines 2b—i, the borazines 3b—d,f, and the Dewar borazine 3e′ are split into the corresponding iminoboranes RB≡NtBu at 500-600 °C in the gas phase. The molten borazines 3b—d,f and Dewar borazines 3e′, j′ are contracted to the corresponding diazadiboretidines 2b—f, j at 160-320 °C. [Ligands R/R′: iPr/iPr (a), Me/tBu (b), Et/tBu (c), Pr/tBu (d), ¡Pr/ tBu (e), Bu/tBu (f), iBu/tBu (g), tBu/tBu (h), tBu(Me3Si)N/tBu (i), Ph/tBu (j).]

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4

Dibandjo, P., F. Chassagneux, L. Bois, C. Sigala, and P. Miele. "Condensation of borazinic precursors for mesoporous boron nitride synthesis by carbon nanocasting." Journal of Materials Research 22, no. 1 (January 2007): 26–34. http://dx.doi.org/10.1557/jmr.2007.0028.

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The influence of different borazinic precursors on mesoporous boron nitride synthesis by using a nanocasting process of a mesoporous CMK-3 carbon is presented. Two borazinic precursors, the tri(methylamino)borazine (MAB) and the tri(chloro)borazine (TCB), have been converted to boron nitride (BN) inside the mesopores of a CMK-3 carbon mesoporous template by using thermal or chemical polycondensation processes. Ordered mesoporous boron nitride with a specific surface area around 800 m2/g, a mesoporous volume around 0.6 cm3/g, and a pore-size distribution located at 6 nm in diameter was synthesized by thermal condensation of a molecular MAB precursor. In addition, chemical condensation of TCB led to a disordered mesoporous boron nitride.

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5

Deng, Cheng, Meng Fu Zhu, Hong Bo Su, Xiu Dong You, and Ping Chen. "Evolution of Composition and Structure of Poly[(alkylamino)borazine] to Boron Nitride Ceramic during Pyrolysis Process." Key Engineering Materials 602-603 (March 2014): 146–50. http://dx.doi.org/10.4028/www.scientific.net/kem.602-603.146.

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Boron nitride (BN) was prepared by polymer-derived method using precursor poly [(alkylamino) borazin (PABZ). The evolution of composition and structure of precursor PABZ into BN ceramic during curing and pyrolysis process was investigated by FTIR, TG, XRD techniques and chemical analysis. The results showed that PABZ could fulfill curing heated at 80°C for 2hrs in NH3 atmosphere. During the curing process the both transamination reaction and condensation reaction occurred, resulting in cross-link between monomer molecular. With the proceeding of curing process, the new B-N bonds were formed and continued to expand in three dimensions. After cured treatment the thermal pyrolysis of PABZ in ammonia atmosphere was took place, and inorganic degree and crystallinity of products were better, which was more suitable for preparation of high purity hexagonal BN (h-BN) ceramic.

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6

Koch, Hans-Joachim, Herbert W. Roesky, Susanne Besser, and Regine Herbst-Irmer. "Synthese und Struktur des ersten Tellur-haltigen Borazin-Derivats und einer Tellur-haltigen Bor – Stickstoff-Spiro-Verbindung." Chemische Berichte 126, no. 3 (March 1993): 571–74. http://dx.doi.org/10.1002/cber.19931260304.

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7

Deshmukh, Vinayak, Mahadevappa Nagnathappa, Bhagwat Kharat, and Ajay Chaudhari. "Theoretical study of borazine and substituted borazines using density functional theory method." Journal of Molecular Liquids 193 (May 2014): 13–22. http://dx.doi.org/10.1016/j.molliq.2013.12.011.

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8

Malenov, Dušan P., Andrea J. Aladić, and Snežana D. Zarić. "Stacking interactions of borazine: important stacking at large horizontal displacements and dihydrogen bonding governed by electrostatic potentials of borazine." Physical Chemistry Chemical Physics 21, no. 44 (2019): 24554–64. http://dx.doi.org/10.1039/c9cp02966d.

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9

Ivanaysky, Victor V., N. T. Krivochurov, and V. F. Aulov. "Improving the Characteristics of Wear-Resistant Coatings Obtained by HDTV-Boration, their Modification by Intermetallic Compounds of Fe-Al and Ni-Al Systems." Materials Science Forum 992 (May 2020): 640–46. http://dx.doi.org/10.4028/www.scientific.net/msf.992.640.

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Innovative technology of HDTV-borating, that is distinguished by high hardness, strength, wear resistance and corrosion resistance occupies a special place among the hardening processes for steels and construction materials. During the new technology process HDTV-boration of structural steel 65Mn (65Г in Russian) under a mix layer of charge mixture based on fused borate fluxing agent P-0.66, boron carbide and intermetallic compounds FexAly, NixAly. Using the methods of X-ray phase analysis, spectrography and metallography, the composition and structure of coatings were determined, the microhardness distribution over the coating thickness was studied. In the coatings, new phases of intermetallic compounds, the double superhard boride Fe2AlB2, were found; in the coatings, the base iron boride is FeB, what leads to an increase in their hardness and wear resistance. Modification of boride coatings formed by intermetallic compounds with melting temperatures close to the process temperature of HFC surfacing leads to a decrease in the cracks number and the appearance of new consumer qualities of the material.

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Carter, Tyler J., Zachariah M. Heiden, and Nathaniel K. Szymczak. "Discovery of low energy pathways to metal-mediated BN bond reduction guided by computation and experiment." Chemical Science 6, no. 12 (2015): 7258–66. http://dx.doi.org/10.1039/c5sc02348c.

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The reduction of borazine-type heterocycles has been a challenge in the area of chemical hydrogen storage. Coordination to low valent metal carbonyls activates borazine for reduction by both 1 e⁻ and 2 e⁻ pathways.

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Dissertations / Theses on the topic "Borazin"

1

Schurz, Fanny [Verfasser], and Martin [Akademischer Betreuer] Jansen. "Synthese und Charakterisierung neuer funktionalisierter BN-Heterozyklen und Borazin-abgeleiteter Si/B/N/C-Keramiken / Fanny Schurz. Betreuer: Martin Jansen." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2012. http://d-nb.info/1026043298/34.

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Förster, Diana [Verfasser]. "Elektronendichtebestimmungen an Boranen, Boraten und Boranaten zur Analyse von Zwei-Elektronen-Drei-Zentren-Bindungen und Lewis-Säure-Base-Wechselwirkungen / Diana Förster." Berlin : Freie Universität Berlin, 2008. http://d-nb.info/1023168715/34.

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Emmett, Liam. "Synthesis and characterisation of arene borazine hybrids." Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.675733.

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We present the synthesis and characterisation of novel single organic molecules known as phenoxylene borazines and borazatruxenes. Using temperature-dependant and concentration-dependant 1H NMR, we probe the supramolecular aggregation of these molecules in solution. Finally, we synthesise 2D hybrid material comprised of electron delocalised benzene rings and electron localised borazine rings. Using a combination of solid-state 11B and 13C NMR techniques, Raman spectroscopy and XPS, we confirm the presence of benzene and borazine regions in these novel materials.

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Lehnert, Christian. "Neue Silazan-und Borazinverbindungen Synthese, Charakterisierung und Anwendungspotential." Saarbrücken VDM Verlag Dr. Müller, 2007. http://d-nb.info/988906988/04.

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5

Gackstatter, Annika [Verfasser], and Holger [Gutachter] Braunschweig. "Reaktivität von Boranen gegenüber Hauptgruppenelement-Lewisbasen und Reaktiviät von Lanthanoid- und Actinoidkomplexen gegenüber Boranen / Annika Gackstatter ; Gutachter: Holger Braunschweig." Würzburg : Universität Würzburg, 2018. http://d-nb.info/1160876967/34.

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Guilhon, Florence. "Obtention de nitrure de bore par pyrolyse de nouveaux précurseurs moléculaires." Lyon 1, 1993. http://www.theses.fr/1993LYO10255.

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Un des moyens principaux d'elaboration du nitrure de bore, bn, ceramique technique, consiste a pyrolyser des precurseurs moleculaires liquides a base de bore et d'azote. Dans le but de trouver de nouvelles especes de ce type nous avons etudie la synthese d'un certain nombre de b-trialkyl(aryl)-borazines. Au cours de ces investigations nous avons mis au point une nouvelle methode de synthese de certains (clbnr)3 prepares a partir de bdma. Bcl3 et de rnh2. Hcl (r=ch3, c2h5). Nous avons egalement synthetise un nouvel heterocycle du type 1-3-dibora-2-4-diazaro-naphtalene, a partir de bdma. Bcl3 et de c6h5nh2. Hcl. L'etude de la nouvelle reaction mettant en jeu la cyanamide et la trichlorure de bore a ensuite ete entreprise, conduisant a deux produits majoritaires: le complexe nh2cn. Bcl3 (insoluble) et le dimere, (nh2cclnbcl2)2 (soluble). Une atg du complexe jusqu'a 1000c sous ar a conduit a la formation de bn amorphe pulverulent et noir. L'impregnation d'une pastille de graphite par le dimere en solution dans ch2cl2 suivie d'une pyrolyse sous nh3 a permis d'elaborer un depot de nitrure de bore protegeant notablement le graphite vis-a-vis de l'oxydation. Nous nous sommes ensuite interesses au b(nhch3)3, espece liquide. Par simple chauffage, il se cyclise en aminoborazine, polymerise en un polyborazine tridimensionnel, conduit a du t-bn puis du h-bn (chauffage jusqu'a 1700c en partie sous nh3). L'impregnation d'une meche de fibres de carbone par cet aminoborane suivie d'une pyrolyse sous nh3 a conduit a la formation d'un materiau composite ceramique-ceramique avec une matrice tres compacte de t-bn. Un depot adherent et uniforme de nitrure de bore a egalement ete obtenu par un traitement similaire sur une pastille de graphite

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7

Pujol, Patrick. "Mésophases massives de nitrure de bore hexagonal." Bordeaux 1, 2000. http://www.theses.fr/2000BOR12222.

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La réaction de condensation en masse d'un précurseur inorganique de nitrure de bore hexagonal, la borazine, a été développée dans le but d'élaborer des dérivés polycycliques de type mésophasique nommés borazines polycondensées (BPC). Les BPC ainsisynthétisées peuvent conduire à un état cristal liquide préfigurant la structure du nitrure de bore hexagonal,état obtenu après mise en solution dans un solvant adéquat. Elles ont été employées comme précurseur d'interphase BN dans des minicomposites Hi-Nicalon/BN/SiC, après dépôt par 'dip-coating' et pyrolyse du précurseur condensé. L'élaboration de monofilaments BN de courte longueur a aussi été examinée.

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8

Fraenk, Wolfgang. "Oligomere und hochenergetische Borazide sowie elektrophile N+-F-Fluorierungsmittel." Diss., [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963038168.

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Reich, Thomas. "Designed Synthesis of Halogenated Borazine-Linked Polymers and Their Applications in Gas Storage and Separation." VCU Scholars Compass, 2011. http://scholarscompass.vcu.edu/etd/282.

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The synthesis of highly porous organic polymers with predefined porosity has attracted considerable attention due to their potential in a wide range of applications. Of particular interest in porous organic polymers is their potential use in automotive applications as well as separation processes whereby advancements could result in a reduction in carbon dioxide emissions and the production of natural gas in a more economically friendly manner. Along these pursuits, seven borazine-linked polymers (BLPs) have been synthesized through the introduction of p-phenylenediamine, 1,3,5-tris-(4-aminophenyl)benzene, benzidine, or tetra-(4-aminophenyl)methane with boron tribromide or boron trichloride followed by the thermolysis reaction of the resulting in situ adduct. All resulting polymers exist as amorphous polymers whose chemical connectivity was confirmed through FT-IR, solid state 11B and 13C NMR, and elemental analysis while thermogravimetric analysis reveals moderate thermal stabilities up to about 200°C. To assess their textural properties, all BLPs were subjected to nitrogen sorption experiments at 77 K. In all cases, the polymers possess high surface areas with chlorinated BLPs exhibiting higher values than their brominated analogues (1174-1569 m2/g versus 503-849 m2/g, respectively). Gas storage capabilities of BLPs for hydrogen, carbon dioxide, and methane were investigated as well. BLPs possess good hydrogen uptakes (0.68-1.75 wt% at 77 K) and zero-coverage isosteric heat of adsorption, Qst, (7.06-7.65 kJ/mol) as calculated by the virial method. The uptakes and heats of adsorption for carbon dioxide (51-141 mg/g at 273 K with Qst: 22.2-31.7 kJ/mol) are also attractive. BLPs do not, however, appear to exhibit significant methane storage capabilities (1.9-15.2 mg/g at 273 K with Qst: 17.1-21.7 kJ/mol). In light of such a difference in storage between carbon dioxide and methane, CO2/CH4 selectivity was calculated for each polymer according to the ideal adsorbed solution theory (IAST). Three of the polymers, BLP-1(Br), BLP-2(Br), and BLP-10(Cl), possess excellent selectivity capabilities over 20 even at low pressures for all molar ratios. Additionally, these selectivity values increase further with increasing pressure. Selectivity was also investigated for benzimidazole-linked polymers. In such systems, the CO2/N2 selectivity values reach 73 at low pressure and exhibit an increasing trend with increasing pressure.

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Zhong, Wenli. "Préparation de matériaux à base de nitrure de bore pour des applications 'énergie'." Thesis, Montpellier 2, 2012. http://www.theses.fr/2012MON20186.

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Bien que proposant des avantages importants par rapport à d'autres matériaux, les céramiques présentent un défaut récurrent, qui est leur plus ou moins grande fragilité due à des défauts de structure ou à des impuretés dans les réseaux structuraux. On s’affranchit de ces contraintes en améliorant la pureté des matériaux de base, en maîtrisant mieux les processus de fabrication, en les renforçant et en nanostructurant le matériau. C’est ce qui a donné naissance aux méthodes chimiques d’élaboration dites de « Bottom-up » qui reprennent le schéma de principe de la conception de la céramique naturelle en s’adaptant à la démarche des chimistes : des briques élémentaires représentant une architecture moléculaire sont assemblées pour former un composé macromoléculaire dont la composition est contrôlée à l’échelle atomique. Ce composé est mis en forme, durcit pour être transformé par cuisson en une céramique dont la composition est directement liée à la structure moléculaire des briques. Cette démarche est à l’origine de la voie dite des « polymères précéramiques ». Cette voie chimique s’adapte aux exigences des domaines de l’énergie. Notamment et afin d’exploiter et de saisir les opportunités que constituent l’apparition de nouveaux besoins en matériaux et/ou l’établissement de cahiers des charges stricts au regard des propriétés des matériaux dans ce domaine, la présente étude a pour objet d’élaborer des matériaux à base de BN comme les composites à renforts fibreux, les nanocomposites et les mousses.Après une introduction générale, le chapitre 1 décrit l’état de l’art de BN. Il s’intéresse à la littérature sur les propriétés des différentes formes du BN. La voie PDCs est détaillée et son application à l’élaboration du h-BN. Les différents types de précurseurs et de polymères sont décrits et l’accent est mis sur le borazine et le polyborazylène. La dernière partie concerne l’élaboration des composites à renforts fibreux, les nanocomposites et les mousses à base de BN qui sont considérés.Le chapitre 2 s’intéresse à l’élaboration de C/BN composites à partir de polyborazylènes qui est un projet de recherche sur ITER. Après un rappel sur le contexte de CEA, les différentes étapes liées au procédé d’élaboration des composites sont décrites et étudiées à l’aide d’outils de caractérisation comme la RMN solide,TGA, XRD et SEM. Le chapitre 3 s’intéresse à des nanocomposites qui se caractérisent par des phases nanocristallines de nitrure métallique parmi le nitrure de titane, de zirconium et d’hafnium dispersés dans une matrice de BN faiblement cristallisée. L’accent est mis sur la chimie moléculaire et sur la synthèse de polymétalloborazines qui permettent de conduire par pyrolyse à la formation directe de ces nanocomposites par croissance in-situ de la phase nanocristalline dans la matrice BN. Une étude préliminaire sur la possibilité de mettre en forme les polyméres en vue d’élaborer des structures massives nanocomposites est abordée.Le chapitre 4 se consacre à deux procédés de préparation de mousses. Le premier procédé qui combine la voie PDCs à la chimie intégrative vise à élaborer des mousses BN à porosité hiérarchisée. Le second procédé consiste à mélanger PMMA avec polyborazylènes pour subir des étapes de compactage et de pyrolyse générant des mousses. Pour ces deux types de matériaux, des mesures texturales comme BET et la porosimétrie mercure sont entreprises.Une conclusion générale termine le manuscrit. Elle fait un rappel des travaux entrepris dans chacun des trois chapitres et donne des perspectives liées aux trois types de matériau étudiés pendant la thèse
Energy developments have brought hexagonal boron nitride-based materials increasing interest for future materials and technologies. The objective of this thesis concerns the preparation of BN shapes for energy applications including fiber-reinforced BN composites, BN-based nanocomposites and BN foams. Fiber-reinforced BN composite and BN nanocomposites display potential as tiles for protection limiters for the Ion Cyclotron Range Frequency antennas in fusion nuclear reactors. Porous BN materials have interests as host material for hydrogen storage and as catalyst supports. The Polymer-Derived Ceramics route which offers new preparation opportunities in chemistry and ceramic sciences is applied to manufacture shaped BN-based materials.Firstly, in the context of C/BN composite, polyborazylene vacuum-assisted infiltration and pyrolysis process was successfully introduced. We focused on the design, elaboration and properties of the C/BN composite through the study of the (1) synthesis and polymerization of borazine, (2) the polyborazylene-to-boron nitride conversion, (3) the morphological texture and mechanical properties of derived C/BN composites. We firstly demonstrated that it is possible to obtain dense-derived C/BN composites (density: 1.773 g cm-3, open porosity: 5.09%) by tuning the viscosity of polyborazylene in the infiltration process. SEM observation presented a very strong bonding between fibers and matrix. TGA under air analysis confirmed the improved oxidation resistance property of C/BN composite compared with C fiber.Secondly, we investigated the design, processing, and properties of transition metal-containing boron nitride nanocomposites from polymetalloborazine. With proper choice of boron nitride precursor, and by controlling the B/M ratio (M = Ti, Zr, Hf), a set of representative polymetalloborazines has been prepared as precursors of nanocomposites. In the reaction of BN source with metal precursor leading to polymetalloborazines, two main mechanisms are mainly concerned: N-H and B-H units of BN percursor react with N-alkyl groups presented in metal precursors. After its pyrolysis under ammonia up to 1000 oC then nitrogen from 1000 to 1500oC, the derived nanocomposites reveal the presence of metal nitride nanocrystales with an average diameter of 6.5 nm homogeneously embedded in a poorly crystallized boron nitride matrix. A preliminary study is presented on the preparation of monolith-type nanocomposites from selected polytitanoborazines. Finally, we applied two PDCs route-based strategies to prepare hierarchically porous and micro cellular BN foams. In the first strategy, monolith-type BN foams with a hierarchical porosity were synthesized from polyborazylene using an integrative chemistry combined-based sequence set-up that consists of the impregnation of silica and carbonaceous templates followed by pyrolysis process and elimination of the template. These novel porous BN architectures display hierarchical and high porosity (76 %) with an open-cell interconnected macroporosity and a surface area up to 300 m2g-1. In the second strategy, a sacrificial processing route has been proposed to fabricate micro cellular BN foams with a porosity of 79 % from a mixture of polyborazylene and poly(methylmethacrylate) (PMMA) microbeads by warm-pressing followed by pyrolysis consisting of the burn-out of PMMA while polyborazylene is converted into BN. These novel BN foams display potential as catalyst supports and host material for hydrogen storage

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Books on the topic "Borazin"

1

Perić, Danica. Mesec boravi na Obrovu. 2nd ed. Bijelo Polje: Pegaz, 2007.

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M, Ilolov, ed. Dar borai ilm. Dushanbe: Donish, 2010.

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Atölyesi, SineGöz Film, ed. Akıntıya karşı-- Behice Boran. Kadıköy, İstanbul: Yazılama, 2009.

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Phinthuphan, Hūan. Mūang borān khō̜ng rao: Kō̜ranī sưksā Mūang borān nai Phitsanulōk Phičhit ʻUttaradit Lop Burī læ ʻĀngthō̜ng. Krung Thēp: Bantưk Sayām, 1999.

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Isack, Hussein Adan. People of the north: Boran. Nairobi: Evans, 1986.

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Asozoda, Rajab. Rivoi︠a︡tḣo dar borai ḣazrati Amirjon. Kūlob (Tajikistan): [s.n.], 1993.

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Afsonaḣoi Avrupoī dar borai Ismoiliën. Dushanbe: ĖR-graf, 2011.

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Tajikistan. Qonuni Jumḣurii Tojikiston Dar borai maorif. Dushanbe: [publisher not identified], 2013.

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Tajikistan. Qonun Dar borai sudḣoi Jumḣurii Tojikiston. Dushanbe: [s.n.], 2007.

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Behice Boran: Öğretim üyesi, siyasetçi, kuramcı. Cağaloğlu, İstanbul: Yordam Kitap, 2007.

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Book chapters on the topic "Borazin"

1

Uchimaru, Yuko. "Borazine Polymers." In Encyclopedia of Polymeric Nanomaterials, 255–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-29648-2_137.

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Uchimaru, Yuko. "Borazine Polymers." In Encyclopedia of Polymeric Nanomaterials, 1–9. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-36199-9_137-1.

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Haworth, D. T., G. Y. Lin Kiel, Lee J. Todd, and Mark W. Baize. "Polycyclic Borazines." In Inorganic Syntheses, 57–60. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132609.ch17.

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Whitfield, H. J. "Giving Borazines." In Inorganic Reactions and Methods, 203–4. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470145210.ch136.

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Li, Jie Jack. "Miyaura boration reaction." In Name Reactions, 239. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-04835-1_188.

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Li, Jie Jack. "Miyaura boration reaction." In Name Reactions, 266. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05336-2_199.

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Paine, R. T., and Larry G. Sneddon. "Recent Developments in Borazine-Based Polymers." In ACS Symposium Series, 358–74. Washington, DC: American Chemical Society, 1994. http://dx.doi.org/10.1021/bk-1994-0572.ch027.

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Bernard, Samuel, David Cornu, Sylvain Duperrier, Bérangère Toury, and Philippe Miele. "Borazine Based Preceramic Polymers for Advanced BN Materials." In Inorganic and Organometallic Macromolecules, 351–71. New York, NY: Springer New York, 2008. http://dx.doi.org/10.1007/978-0-387-72947-3_14.

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Wideman, Thomas, Paul J. Fazen, Anne T. Lynch, Kai Su, Edward E. Remsen, Larry G. Sneddon, Tuqiang Chen, and Robert T. Paine. "Borazine, Polyborazylene, β-Vinylborazine, and Poly(β-Vinylborazine)." In Inorganic Syntheses, 232–42. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132630.ch39.

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Bernard, Samuel, Sylvain Duperrier, Fernand Chassagneux, David Cornu, and Philippe Miele. "Poly[(Alkylamino)Borazine]-Derived Boron Nitride Fibers for Composite Applications." In Ceramic Transactions Series, 1–10. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118407844.ch1.

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Conference papers on the topic "Borazin"

1

Ugarov, M. V., Vladimir G. Ageev, and Vitali I. Konov. "Excimer-laser-induced chemical vapor deposition of boron nitride films from borazine." In SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, edited by Janice M. Hicks, Wilson Ho, and Hai-Lung Dai. SPIE, 1995. http://dx.doi.org/10.1117/12.221488.

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Verma, Kanupriya, and K. Viswanathan. "BORAZINE AND BENZENE: CHALK AND CHEESE. MATRIX ISOLATION INFRARED AND AB INITIO STUDIES." In 73rd International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2018. http://dx.doi.org/10.15278/isms.2018.te07.

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H. Sajedi, Seyed, and Farnoush Gholami. "Verification of structural relationships in the Kazerun-Borazjan Fault Zone." In GEO 2008. European Association of Geoscientists & Engineers, 2008. http://dx.doi.org/10.3997/2214-4609-pdb.246.312.

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Zhang, Shu, and Xiaohua Zhang. "Preliminary Study of Function Determination and Capacity of ACP600’s Reactor Emergency Borating System." In 2016 24th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icone24-60024.

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ACP600 is a 600WMe power, self-reliance developed pressurized water reactor design of third generation technology, which is the China National Nuclear Corporation’s (CNNC) achievement of continuous R&D and engineering feedback started with M310 series and 600WMe designs. In general technical project of ACP600, there is a plan to cancel Boron Injection Tank (BIT) in safety injection system and set Reactor Emergency Borating (REB) system in order to enhance safety of nuclear power plant. This paper discusses function determination and system capacity of ACP600’s REB system based on the investigations of both international and domestic advanced third generation nuclear power plant emergency borating system’s safety functions and according to ACP600’s top design and general project along with operation and typical accident analysis, bringing forward to preliminary suggestions about function determination and system capacity of ACP600’s REB system as well as further aspect and content for investigations. This provides concrete information for further design of ACP600’s REB system.

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Verma, Kanupriya, and K. Viswanathan. "WHAT IS DIFFERENT BETWEEN BORAZINE-ACETYLENE AND BENZENE-ACETYLENE? A MATRIX ISOLATION AND AB-INITIO STUDY." In 71st International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2016. http://dx.doi.org/10.15278/isms.2016.mk05.

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Manu Prasanth, M. p., J. Gregory Shellnutt, and K. r. Hari. "Platinum-Group Element Geochemistry of Boradih Ultramafic Intrusion from the Sonakhan Greenstone Belt, Bastar Craton." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.1718.

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Kliem, S., T. Hoehne, H. M. Prasser, U. Rohde, and F. P. Weiss. "Experimental Investigation of Coolant Mixing in the RPV of a PWR During Natural Circulation Conditions." In 12th International Conference on Nuclear Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/icone12-49424.

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Partial depletion of the primary circuit during a hypothetical small break loss of coolant accident can lead to the interruption of one-phase flow natural circulation. In this case, the decay heat is removed from the core in the reflux-condenser mode. For the scenario of a hot leg side leak and hot leg safety injection thermal hydraulics analyses using the system code ATHLET showed, that weakly borated condensate can accumulate in particular in the pump loop seal of those two loops, which do not receive safety injection. According to these ATHLET-calculations, one-phase flow is maintained in the remaining two loops at high residual heat conditions because of the entrainment of safety injection coolant into the steam generators. After refilling of the primary circuit, natural circulation in the two stagnant loops simultaneously re-establishes and the de-borated slugs are shifted towards the reactor pressure vessel (RPV). Mixing in the downcomer and the lower plenum is an important phenomenon mitigating the reactivity insertion into the core in this postulated scenario. Therefore, mixing of the de-borated slugs with the ambient coolant in the RPV was investigated at the four loop 1:5 scaled ROCOM mixing test facility. Based on the ATHLET-calculations, a volume flow rate of 5% of the nominal rate was set in the loops running in one-phase flow. The volume flow rate in the two restarting loops increases from zero to 6%. In these two loops, de-borated slugs of 7.2 m3 were assumed corresponding to the volume of the whole loop seal. An experimental parameter study was carried out with different duration of the flow ramp and variation of the density difference between de-borated slug and ambient coolant due to differences in boron concentration and temperature. The variation of the density difference significantly changes the mixing behavior. With no density difference, the weakly borated coolant almost perpendicularly flows down in the downcomer and a maximum of 64% of the initial perturbation is detected in the core entry section below the loops where the slugs were formed. Increasing the density difference, a stratification is observed in the downcomer. The less dense slugs flow around the core barrel at the top of the downcomer. At the opposite side the lower borated coolant is entrained by the colder safety injection water and transported to the core. This entrainment effect leads to the admixture of boron from the safety injection to the under-borated slugs. Consequently, the maximum under-boration at the core entry is lower. For the maximum investigated density difference of 2%, a value of 31% only of the initial under-boration was measured at the core entrance.

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Ivanov, Yurii, Vladimir Shugurov, Elizaveta Petrikova, Olga Krysina, Yulia Denisova, and Oleg Tolkachev. "Borating of high-chromium steel in the scheme of plasma-assisted RF-sputtering of boron cathode as a formation method of multiphase hierarchically organized structure." In PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON PHYSICAL MESOMECHANICS. MATERIALS WITH MULTILEVEL HIERARCHICAL STRUCTURE AND INTELLIGENT MANUFACTURING TECHNOLOGY. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0034207.

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Kliem, So¨ren, Siegfried Mittag, Ulrich Rohde, and Frank-Peter Weiss. "Influence of System and Neutron-Kinetic Parameter Variations on an Anticipated Transient Without SCRAM in a PWR." In 17th International Conference on Nuclear Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/icone17-75569.

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The complete failure of the reactor scram system upon request during an operational transient is called anticipated transient without scram (ATWS). According to the German regulatory guidelines, postulated ATWS events have to be analyzed with regard to their consequences on the safety of nuclear power plants. Since the course of ATWS transients is determined by a strong interaction of the neutron kinetics with the thermal hydraulics of the system, coupled 3D neutron kinetic/thermal hydraulic code systems are adequate tools for the analysis of such transients. The coupled code system DYN3D/ATHLET developed at FZD is applied to the analysis of an ATWS transient. The objective of the present work is to perform a best-estimate analysis with consequent use of a 3D neutron kinetic code (DYN3D) in combination with an advanced thermal hydraulic system code (ATHLET) together with a quantification of differences in the course and the results of transients, which arise from the uncertainties of thermal hydraulic and neutron-physical conditions. Typically, the complete failure of the main feed water supply is assumed to be the bounding ATWS event with regard to the maximum primary coolant pressure, which can be reached during the transient. The limitation of the coolant pressure is a precondition for the integrity of the primary circuit. The situation is aggravated if the main coolant pumps remain in operation. For this particular transient, the influence of different thermal hydraulic and neutron-physical conditions on the course of the transient was analyzed. In a number of code runs all systems which have an influence on the course of the transient were varied. These are the auxiliary boration system and the auxiliary feed water supply. Further, the influence of the modeling of the pressurizer safety and relief valves as well as the steam bypass system on the secondary side was assessed. The variation of the pressurizer relief and safety valve behavior has the biggest influence on the primary circuit coolant pressure. In the second part, two different core loading patterns were generated for the analyses by varying the number of MOX (mixed oxide) fuel assemblies (FA) in the core. The basic core loading contains 64 MOX FA. All these MOX FA were replaced by standard uranium oxide FA. The presence of MOX in the core has a remarkable influence on the reactivity coefficients of the fuel temperature and the moderator density. These two parameters mainly influence the behavior of the coolant pressure in the first part of the transient. It has been demonstrated that the pressure maximum decreases with growing MOX portion in the core. The maximum pressure determined in the calculations with variation of system and neutron-physical boundary conditions does not reach the allowed limit for the primary circuit.

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Reports on the topic "Borazin"

1

Borek, III, Theodore Thaddeus. Borazine Precursors for Boron Nitride Anti Friction Coatings for MEMS. Office of Scientific and Technical Information (OSTI), September 2008. http://dx.doi.org/10.2172/1542286.

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Bai, J., and K. Niedenzu. Convenient Synthesis of Unsymmetrically B-Substituted Borazines. Fort Belvoir, VA: Defense Technical Information Center, March 1991. http://dx.doi.org/10.21236/ada233036.

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Degefa, Tamrat, Alemayehu Lemma, Azage Tegegne, and Curtis R. Youngs. Superovulation of Boran Cattle in Ethiopia: A Preliminary Report. Ames (Iowa): Iowa State University, January 2016. http://dx.doi.org/10.31274/ans_air-180814-474.

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Bai, J., K. Niedenzu, J. Serwatowska, and J. Serwatowski. Preparation of Unsymmetrically B-Substituted Borazines and Characterization of Tris(4,6-diethylborazin-2-yl)amine. Fort Belvoir, VA: Defense Technical Information Center, May 1991. http://dx.doi.org/10.21236/ada235571.

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Borazine precursors for boron nitride anti friction coatings for MEMS. Office of Scientific and Technical Information (OSTI), September 2008. http://dx.doi.org/10.2172/961656.

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Borazine precursors for boron nitride anti friction coatings for MEMS. Office of Scientific and Technical Information (OSTI), September 2008. http://dx.doi.org/10.2172/940531.

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