Готові списки джерел за темами / (n, n’γ)

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Добірка наукової літератури з теми "(n, n’γ)"

Автор: Grafiati

Опубліковано: 13 квітня 2024

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Статті в журналах з теми "(n, n’γ)"

Larson, D. C., та J. K. Dickens. "Cr53(n,n’γ) reactions and the level structure ofCr53". Physical Review C 39, № 5 (1 травня 1989): 1736–50. http://dx.doi.org/10.1103/physrevc.39.1736.

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Henning, Greg, Kerveno Maëlle, Philippe Dessagne, François Claeys, Nicolas Dari Bako, Marc Dupuis, Stephane Hilaire та ін. "Measurement of ¹⁸³W(n, n’γ) and (n, 2nγ) cross-sections (preliminary)". EPJ Web of Conferences 284 (2023): 01046. http://dx.doi.org/10.1051/epjconf/202328401046.

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The necessary improvement of evaluated nuclear databases for appplication will be achieved with improvement of models and new, precise data. In particular, the effect of inelastic neutrons scattering can be of importance for reactors. In order to test the models, we performed measurement of (n, n’γ) and (n, 2nγ) cross-sections on 183W. These data will help constrain the calculation codes and ensure a better evaluation of the total (n, xn) cross section. The experimental setup and the data analysis method will be presented. The preliminary experimental results for the 183W isotope will be compared to predictions from Talys nuclear reaction code.

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Belgya, T., B. Fazekas, G. Molnár, Á. Veres, R. A. Gatenby, J. R. Vanhoy, E. M. Baum, E. L. Johnson та S. W. Yates. "Search for various collective excitation modes with the (n, n’γ) reaction". Acta Physica Hungarica 69, № 3-4 (квітень 1991): 179–89. http://dx.doi.org/10.1007/bf03156090.

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Yates, S. W. "Mixed-symmetry states in weakly deformed nuclei from (n,n’γ) reaction studies". Journal of Radioanalytical and Nuclear Chemistry 265, № 2 (липень 2005): 291–95. http://dx.doi.org/10.1007/s10967-005-0823-5.

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Jungclaus, A., T. Belgya, D. P. DiPrete, M. Villani, E. L. Johnson, E. M. Baum, C. A. McGrath, S. W. Yates та N. V. Zamfir. "Lifetimes and electromagnetic decay properties of negative-parity states inSm150,152,154from (n,n’γ) measurements". Physical Review C 48, № 3 (1 вересня 1993): 1005–9. http://dx.doi.org/10.1103/physrevc.48.1005.

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DiPrete, D. P., T. Belgya, E. M. Baum, E. L. Johnson, S. W. Yates, P. D. Cottle, M. A. Kennedy та K. A. Stuckey. "Search for high-lying octupole states and octupole fragmentation inPt196with the (n,n’γ) reaction". Physical Review C 48, № 6 (1 грудня 1993): 2603–6. http://dx.doi.org/10.1103/physrevc.48.2603.

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Henning, Greg, Maëlle Kerveno, Philippe Dessagne, François Claeys, Nicolas Dari Bako, Marc Dupuis, Stéphane Hilaire та ін. "On the need for precise nuclear structure data for high quality (n, n’γ) cross-section measurements". EPJ Web of Conferences 284 (2023): 01022. http://dx.doi.org/10.1051/epjconf/202328401022.

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The necessary improvement of evaluated nuclear data for nuclear applications development is possible through new and high-quality measurements, often combined with appropriate nuclear-reaction modelling. In particular, improving inelastic cross-section evaluations requires new and high-quality data. We measure (n, n’γ) cross-sections using prompt γ-ray spectroscopy and neutron energy determination by time-of-flight. To extract, from these partial data, the total inelastic cross-section, we rely on theoretical model as well as nuclear structure data such as γ ray emission probabilities. This structure information, tabulated in databases, comes with uncertainty. This directly affects the precision of our results, regardless of how good the measurement is. In this paper, we will present the issue of limited precision structure data and its impact on nuclear reaction data quality in the case of neutron inelastic scattering measurements. We will also discuss how to foresee and mitigate the issue.

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Dari Bako, Nicolas, Maëlle Kerveno, Philippe Dessagne, Catalin Borcea, Marian Boromiza, Roberto Capote, François Claeys та ін. "From ²³²Th(n, n’γ) cross sections to level production and total neutron inelastic scattering cross sections". EPJ Web of Conferences 284 (2023): 08005. http://dx.doi.org/10.1051/epjconf/202328408005.

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To probe the neutron inelastic scattering off 232Th, an experiment took place at the EC-JRC Geel conducted with the experimental setup GRAPhEME to detect emitted γ-rays. The prompt γ-ray spectroscopy method was used and 70 experimental 232Th(n, n’γ) cross sections were obtained from the experimental data. Combining these cross sections, nuclear-structure data available in databases and hypotheses to complete the latter, neutron inelastic level production cross sections in 232Th and the total inelastic cross section were calculated. For the first time, the total inelastic cross section of an actinide nucleus was derived on the total neutron energy range from experimental data only. Comparisons of (n, n’) cross section data with evaluated data reveal a good agreement between them all above 300 keV of neutron energy. TALYS calculations are compatible but lower than the evaluated data.

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Negret, Alexandru, Catalin Borcea, Marian Boromiza, François Claeys, Philippe Dessagne, Cristiano Fontana, Greg Henning, et al. "A new measurement on ⁵⁶Fe(n,inl) using GAINS@GELINA." EPJ Web of Conferences 284 (2023): 01034. http://dx.doi.org/10.1051/epjconf/202328401034.

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The extended dataset of 56Fe(n,n’γ) cross sections measured by our group more than a decade ago at GELINA (Geel Linear Accelerator) was used in many recent evaluations like ENDF, JEFF and CIELO. Despite the special measures we took to ensure reliability and accuracy, concerns were raised by various groups with regard to several features of this dataset (absolute normalization and/or shape) and therefore the 56Fe(n,inl) cross section is still under the evaluation by the International Nuclear Data Evaluation Network (INDEN). Consequently, a new experiment is now under preparation aiming to take advantage of the numerous experimental improvements of the GAINS (Gamma Array for Inelastic Neutron Scattering) setup implemented over the years. While γ spectroscopy combined with the time-of-flight method will remain the main technique involved, several other experimental details will differ substantially.

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Claeys, François, Philippe Dessagne, Maëlle Kerveno, Cyrille De Saint Jean, Catalin Borcea, Marian Boromiza, Roberto Capote та ін. "Measurement of partial (n, n’γ) reaction cross-sections on highly radioactive nuclei of interest for energy production". EPJ Web of Conferences 284 (2023): 01014. http://dx.doi.org/10.1051/epjconf/202328401014.

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In the context of the development of Gen. IV nuclear reactors, the GIF (Generation IV. International Forum) has selected six innovative technologies. Among them, one can highlight the concept of breeding for 232Th/233U and 238U/239Pu fuel cycles. But those nuclei, crucial for such cycles, suffer from a lack of precise knowledge (nuclear structure, reaction cross sections). In particular, it has been demonstrated that neutron inelastic scattering reaction cross sections are not known with sufficient precision for the isotopes 238U and 239Pu, and not known at all experimentally for 233U. In order to perform simulations of innovative reactor cores for the development of those technologies, the knowledge of the reaction cross section has to be improved which implies that new measurements have to be done. The GRAPhEME (GeRmanium array for Actinides PrEcise MEasurements) experimental setup, developed by the IPHC laboratory from CNRS and installed at the EC-JRC-Geel GELINA facility is a powerful tool to answer this need [1, 2]. Combining the prompt γ-ray spectroscopy and the time-of-flight methods, it measures partial (n, xnγ) reaction cross sections. This paper reports on the improvements made on the GRAPhEME setup and data analysis methodology to tackle the challenge of (n, xnγ) cross section measurements on high activity actinides. Results obtained so far on 233U are presented compared to TALYS calculations.

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Більше джерел

Дисертації з теми "(n, n’γ)"

Claeys, François. "Mesure, modélisation et évaluation de sections efficaces à seuil (n, xnγ) d’intérêt pour les applications de l’énergie nucléaire". Electronic Thesis or Diss., Strasbourg, 2023. http://www.theses.fr/2023STRAE027.

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Dans le contexte du développement des réacteurs de génération IV, des données nucléaires précises sont requises. Dans ce travail de thèse, on s’intéresse en particulier à la section efficace de diffusion inélastique (n, n’) pour les noyaux d’233U et d’238U. L'analyse des données de GRAPhEME, dispositif combinant les méthodes de la spectroscopie-γ prompte et du temps de vol, ont permis d’obtenir, pour la première fois, 12 sections efficaces 233U(n, n’γ). Une modélisation des sections efficaces de ces deux isotopes (233U et 238U) a été réalisée avec le code de réaction nucléaire TALYS. Dans le cas de l’238U, l’implémentation de nouveaux modèles permet un meilleur accord calcul/mesure pour les sections efficaces (n, n’γ). Il a été montré cependant que cela n’influe pas sur la section efficace (n, n’). Enfin, une évaluation des incertitudes des sections efficaces de réaction pour l’238U menée avec CONRAD compare différentes méthodes afin de propager les incertitudes expérimentales aux paramètres des modèles via l’inférence Bayésienne
In the context of the development of generation IV nuclear reactors, precise nuclear data are needed. In this work, we study in particular inelastic scattering cross section for 233U and 238U nuclei. From the analysis of data from GRAPhEME, an experimental device combining prompt γ- spectroscopy and time of flight, we obtained for the first time 12 233U(n, n’γ) reaction cross sections. Cross sections modelling has been performed for both isotopes (233U et 238U) with the nuclear reaction code TALYS. In the 238U case, the implementation of new model in the code highlighted better agreement calculation/experiment for (n, n’γ) reaction cross sections. Despite this result, no change in the total inelastic scattering cross section has been seen. Finally, a cross sections uncertainties evaluation has been done with CONRAD, comparing different methods of propagating experimental uncertainties to model parameters via the Bayesian inference

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張, 善実. "漢語サ変動詞「除Nする」の意味と構文". 名古屋大学大学院国際言語文化研究科日本言語文化専攻, 2013. http://hdl.handle.net/2237/17764.

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Частини книг з теми "(n, n’γ)"

Hamer, Kenneth. "Independent and Impartial Tribunal." In Professional Conduct Casebook. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198817246.003.0038.

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N, a professor and consultant in obstetrics of international repute, appeared before the Professional Conduct Committee (PCC) of the General Medical Council (GMC) in May 1998. The charge was dismissed, but, in the course of N’s evidence on oath, it was alleged that he lied to the Committee. The matter was referred to the Crown Prosecution Service (CPS), which decided that there was insufficient evidence for a realistic prospect of conviction of perjury. However, a second disciplinary hearing took place with a different panel in November/December 2000. The second panel found that N had given a patently incorrect answer under oath and that he was guilty of serious professional misconduct; the panel issued what it described as the severest of reprimands.

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Fodor, Jerry, and Ernest Lepore. "All at Sea in Semantic Space: Churchland on Meaning Similarity." In The Compositionality Papers, 174–200. Oxford University PressOxford, 2002. http://dx.doi.org/10.1093/oso/9780199252152.003.0010.

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Abstract IT is old news that the identity conditions for contents, meanings, and the like are problematic, perhaps because there cannot be identity conditions for meanings unless there is an analytic/synthetic distinction, and there is n ’t. We are n’t proposing to consider whether the notion of content identity can be made metaphysically respectable. But we want to discuss a proposal about how to save semantics if it does turn out that ‘same meaning’ can ’t be reconstructed; it is one that is currently popular in both the philosophical and the cognitive science literature.1The idea is that the purposes semantic theories are supposed to serve do not actually require principles of content individuation; all they require is a notion of content similarity. On such a view, similarity of meaning is primitive relative to sameness of meaning, and the latter might be of interest only as a limiting case of the former; perhaps, indeed, a limiting case that is never achieved in practice. Meaning similarity is real and robust, there is a lot of it around, and it is metaphysically prior to synonymy. So the story goes.

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Balasse, Marie, Matthieu Keller, Adrian Balasescu, Anne Tresset, and Philippe Chemineau. "Cycle de reproduction des ovins et rythme saisonnier de l’élevage : un schéma plurimillénaire bouleversé par la recherche agronomique." In Regards croisés: quand les sciences archéologiques rencontrent l'innovation, 25–50. Editions des archives contemporaines, 2017. http://dx.doi.org/10.17184/eac.3789.

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Ovins et caprins connaissent au cours de l’année des périodes de fertilité et d’infertilité pesant fortement sur les élevages, avec des conséquences sur l’organisation du travail et la disponibilité des productions. Des recherches visant à contrôler et maîtriser la reproduction des petits ruminants sont développées afin de s’affranchir de ces contraintes saisonnières. Elles portent actuellement sur l’utilisation des signaux socio-sexuels, comme une alternative aux traitements lumineux et hormonaux largement utilisés par les agriculteurs pour induire et synchroniser l’ovulation des femelles, mais présentant des problèmes sanitaires, environnementaux et sociétaux. « L’effet mâle », qui consiste en la réactivation de l’ovulation suite à l’introduction d’un mâle parmi des femelles en repos sexuel, est incontestablement une solution d’avenir intéressante pour la transformation des élevages actuels vers l’utilisation de techniques moins coûteuses, sans incidence sur l’environnement et favorisant le bien-être animal. En poursuivant l’objectif d’extraire l’éleveur de cette contrainte saisonnière, la recherche agronomique révolutionne un schéma millénaire. Plus de 10 500 ans nous séparent des premiers moutons domestiques. Le caractère saisonnier des naissances a pu peser fortement sur les élevages préhistoriques. Précisément, qu’en était-il ? L’archéozoologie est en mesure d’écrire cette histoire : elle utilise la biogéochimie isotopique pour lire dans les dents des animaux une information relative à leur saison de naissance. L’état des connaissances sur les moutons européens du VIe au IIIe millénaire avant notre ère confirme des naissances saisonnées, survenant sur 3 à 4 mois, plus tardivement aux latitudes élevées (59°N) qu’aux latitudes moyennes (43 à 48°N). La poursuite de cette recherche devrait permettre de renforcer ces schémas globaux contraints par l’environnement, et de préciser une variabilité imputable à des choix techniques. En décrivant cette trajectoire depuis les premiers temps de la domestication, l’archéozoologie replace la recherche agronomique dans une perspective de très longue durée. En outre, elle aidera peut-être à comprendre pourquoi la domestication a atténué mais n’a pas réussi à faire disparaître le saisonnement physiologique de la reproduction chez les ovins domestiques.

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Тези доповідей конференцій з теми "(n, n’γ)"

Yates, S. W. "Probing collective excitations with the (n,n’γ) reaction". У Capture gamma‐ray spectroscopy. American Institute of Physics, 1991. http://dx.doi.org/10.1063/1.41175.

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Youhana, H. M., M. A. Al-Amili, S. R. Al-Obeidi та H. E. Abid. "Angular distribution studies of gamma rays from the 172Yb(n,n’γ) reaction". У AIP Conference Proceedings Volume 125. AIP, 1985. http://dx.doi.org/10.1063/1.35104.

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Wu, Linchun, and George H. Miley. "IEC-Based Neutron Generator for Security Inspection System." In 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22696.

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Анотація:

Large nuclear reactors are widely employed for electricity power generation, but small nuclear radiation sources can also be used for a variety of industrial/government applications. In this paper we will discuss the use of a small neutron source based on Inertial Electrostatic Confinement (IEC) of accelerated deuterium ions. There is an urgent need of highly effective detection systems for explosives, especially in airports. While current airport inspection systems are strongly based on X-ray technique, neutron activation including Thermal Neutron Analysis (TNA) and Fast Neutron Analysis (FNA) is powerful in detecting certain types of explosives in luggage and in cargoes. Basic elements present in the explosives can be measured through the (n, n’γ) reaction initiated by fast neutrons. Combined with a time-of-flight technique, a complete imaging of key elements, hence of the explosive materials, is obtained. Among the various neutron source generators, the IEC is an ideal candidate to meet the neutron activation analysis requirements. Compared with other accelerators and radioisotopes such as 252Cf, the IEC is simpler, can be switched on or off, and can reliably produce neutrons with minimum maintenance. Theoretical and experimental studies of a spherical IEC have been conducted at the University of Illinois. In a spherical IEC device, 2.54-MeV neutrons of ∼108 n/s via DD reactions over recent years or 14-MeV neutrons of ∼2×1010 n/s via DT reactions can be obtained using an ion gun injection technique. The possibility of the cylindrical IEC in pulsed operation mode combining with pulsed FNA method would also be discussed. In this paper we examine the possibility of using an alternative cylindrical IEC configuration. Such a device was studied earlier at the University of Illinois and it provides a very convenient geometry for security inspection. However, to calculate the neutron yield precisely with this configuration, an understanding of the potential wall trapping and acceleration of ions is needed. The theory engaged is an extension of original analytic study by R.L. Hirsh on the potential well structure in a spherical IEC device, i.e. roughly a “line” source of neutrons from a cylindrical IEC is a “point” source from the spherical geometry. Thus our present study focuses on the cylindrical IEC for its convenient application in an FNA detecting system. The conceptual design and physics of ion trapping and re-circulation in a cylindrical IEC intended for neutron-based inspection system will be presented.

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Fransen, C. "Investigating Low-spin States in 92Zr With The (n,nʹγ) Reaction". У MAPPING THE TRIANGLE: International Conference on Nuclear Structure. AIP, 2002. http://dx.doi.org/10.1063/1.1517971.

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Negret, A., C. Borcea та A. Plompen. "Background Assessment for Neutrinoless Double Beta Decay: the Possible (n,n'γ) Contribution". У International African Symposium on Exotic Nuclei. WORLD SCIENTIFIC, 2014. http://dx.doi.org/10.1142/9789814632041_0015.

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Ikemura, Fumiya, Hideki Wakabayashi, Ryosuke Yamagata, Hirotoyo Nakashima та Masao Takeyama. "Effect of Widmanstätten-Type α2-Ti3Al Plates on Creep in γ-TiAl Based Alloy". У AM-EPRI 2019, редактори J. Shingledecker та M. Takeyama. ASM International, 2019. http://dx.doi.org/10.31399/asm.cp.am-epri-2019p1429.

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Abstract In this study the effect of Widmanstätten-type morphology α2 plates on creep has been investigated by preparing nearly equiaxed γ (Nγ) and nearly equiaxed γ having Widmanstätten-type α2 plates within grain (Wα2). Creep tests were conducted at 1073 K under constant stresses, high stress and low stress, in air. At the high stress, Wα2 shows creep rate smaller than Nγ in transient stage, both specimens show similar minimum creep rate and the creep strain at minimum creep rate is 3 % for Wα2 and 10 % for N γ, since N γ shows prolonged primary region. In acceleration stage, both show similar behavior with rupture time of about 50 h and rupture elongation of 60 %. At the low stress, on the other hand, reverse behavior occurs, that is, W α2 shows creep rate higher than Nγ in transient stage. The regions near grain boundaries progressively deformed for both specimens at high stress level, whereas deformed region is extended within grain interiors. From these results it is suggested that α2 plate act as the obstacle for dislocation motion in the γ matrix at high stress and that interfacial dislocation promote the creep deformation at low stress.

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Ratts, Eric B., and J. Steven Brown. "Laminar Entropy Generation Over a Flat Plate With Isothermal and Constant Heat Flux Boundary Conditions Using the Von Ka´rma´n Integral Method." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56088.

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This paper is a fundamental study on the irreversibility of single-phase laminar convective heat transfer over a flat plate with isothermal and constant heat flux boundary conditions. It quantifies the losses due to viscous momentum transfer losses and heat transfer losses and presents the irreversibility of the convective flow based on the entropy generation (EG) method. This paper determines the entropy generation for incompressible, single phase, laminar flow for large and small Prandtl numbers over a flat plate with isothermal and constant heat flux boundary conditions using von Ka´rma´n’s integral theory.

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Barbero, C., та A. Mariano. "Single photon production ν[sub l]N→ν[sub l]Nγ in neutrino-nucleon scattering". У XXXV BRAZILIAN WORKSHOP ON NUCLEAR PHYSICS. AIP, 2013. http://dx.doi.org/10.1063/1.4804127.

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Sierra, Alfonso, Hope Scott, Darwin Pray, Zachary Polus, and Patricia Iglesias. "Effects of Surface Finish and Molecular Structure on the Lubricating Ability of Borate-Based Protic Ionic Liquids." In ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-95163.

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Abstract Friction and wear are inherent problems in mechanical systems, leading to about 23% world’s total energy usage. However, energy losses could be reduced by up to 40% using high-performance lubricants. In order to meet these objectives, Ionic liquids have been studied for more than two decades. Ionic liquids are a class of synthetic salts with melting points below 100 °C due to their asymmetric chemical structure. This feature confers them remarkably interesting physicochemical properties. Moreover, the delocalized charge in their functional groups enables them to react with metal surfaces through the formation of protective layers that prevent them against contact. Ionic liquids are generally categorized based on the nature of their cation into aprotic ionic liquids and protic ionic liquids. Even though aprotic ionic liquids have been proved as neat lubricants and additives with great performance, their applicability is limited as a consequence of the complexity of their synthesis. On the contrary, protic ionic liquids can be easily obtained through proton transfer from a Brønsted acid to a Brønsted base. In this study, two borate-based PILs, N-methylethanolamine 1,2-dodecanediolborate and N’N-dimethylethanolamine 1,2-dodecanediolborate, were synthesized, with same anion and different ammonium cation. Their lubricating abilities were investigated as neat lubricants on steel-steel contact at room temperature, using a custom-designed ball-on-flat reciprocating tribometer. Each protic ionic liquid was tested using ground and polished steel disks and two levels of normal force and frequency. Results showed that the surface finish have an important influence on the lubricating performance of these ordered fluids. In addition, frequency was found to have an influence on the wear mechanisms on steel surfaces.

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Звіти організацій з теми "(n, n’γ)"

Favorite, Jeffrey A. (U) Status of (n,γ) and (n,n'γ) Calculational Capability. Office of Scientific and Technical Information (OSTI), липень 2014. http://dx.doi.org/10.2172/1143958.

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