Relevant bibliographies by topics / Heptagon

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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 'Heptagon'

Author: Grafiati
Published: 28 June 2021
Last updated: 17 February 2022

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Journal articles on the topic "Heptagon"

1

Meunier, V., and P. Lambin. "Propriétés structurales des jonctions de nanotubes de carbone." Canadian Journal of Physics 77, no. 9 (February 1, 2000): 667–75. http://dx.doi.org/10.1139/p99-004.

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The junction between two different nanotubes can be realized by the simple insertion of a pentagon-heptagon pair defect while preserving the triple coordination of each C atom. This insertion bends the structure to an angle depending on the distance between the pentagonand heptagon. The atomic structure of several of these junctions was optimized with the help of empirical potentials, the nanotubes on both sides of the junctions being considered as infinitely long. Local densities of σ + π electronic states were evaluated in the interfacial regions from a tight-binding Hamiltonian. From there, the electronic energy of these junctions was calculated and compared with that of the isolated nanotubes. It was established that the energy associated with the pentagon-heptagone pair in a graphitic tubule is of the order of 6 eV. An automatic generation algorithm for connecting any two tubules was developed. By restricting the Hamiltonian to the sole π orbitals, this algorithm made it feasible to study the energetics of the pentagon-heptagon defect in a systematical way.
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Zukrianto, Zukrianto, Rima Erfianti, Rahmawati Rahmawati, and Ade Novia Rahma Ade Novia Rahma. "Pengembangan Teorema Ceva pada Heptagon Nonkonveks." Jurnal Sains Matematika dan Statistika 7, no. 1 (February 26, 2021): 20. http://dx.doi.org/10.24014/jsms.v7i1.11579.

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Teorema Ceva pada dasarnya merupakan suatu teorema yang berlaku pada segitiga. Dalam penelitian ini teorema Ceva dikembangkan pada heptagon nonkonveks dalam dua kasus. Kasus satu menunjukkan kekonkurenan tujuh buah garis di dalam heptagon nonkonveks dan kasus dua menunjukkan kekonkurenan tujuh buah garis di luar heptagon nonkonveks. Proses ini dimulai dengan pengkontruksian heptagon nonkonveks menggunakan aplikasi Geogebra, selanjutnya pembuktian teorema Ceva dilakukan dengan menggunakan prinsip perbandingan luas pada segitiga. Hasil yang diperoleh dari penelitian ini adalah eksistensi tujuh buah garis dari masing-masing titik sudut pada heptagon nonkonveks berpotongan di satu titik (konkuren) yaitu titik yang berada di dalam dan di luar heptagon nonkonveks.Kata Kunci: Segitiga, Teorema Ceva, Heptagon nonkonveks
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Belitsky, A. V. "Resummed tree heptagon." Nuclear Physics B 929 (April 2018): 113–36. http://dx.doi.org/10.1016/j.nuclphysb.2018.01.031.

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Porter, A. F. "THE REGULAR HEPTAGON." Survey Review 31, no. 245 (July 1992): 409–12. http://dx.doi.org/10.1179/sre.1992.31.245.409.

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Douce, J. L. "THE REGULAR HEPTAGON." Survey Review 32, no. 248 (April 1993): 121. http://dx.doi.org/10.1179/sre.1993.32.248.121.

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Cawthorne, Stephanie, and Judy Green. "Harold and the Purple Heptagon." Math Horizons 17, no. 1 (September 2009): 5–9. http://dx.doi.org/10.1080/10724117.2009.11974834.

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Crompton, T. O. "CONSTRUCTION FOR A REGULAR HEPTAGON." Survey Review 32, no. 248 (April 1993): 122. http://dx.doi.org/10.1179/sre.1993.32.248.122.

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Cawthorne, Stephanie, and Judy Green. "Harold and the Purple Heptagon." Math Horizons 17, no. 1 (September 1, 2009): 5–9. http://dx.doi.org/10.4169/194762109x468283.

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Jiménez, Vicente G., Rubén Tapia, Miguel A. Medel, Inês F. A. Mariz, Tânia Ribeiro, Victor Blanco, Juan M. Cuerva, Ermelinda Maçôas, and Araceli G. Campaña. "Aggregation-induced emission of [3]cumulenes functionalized with heptagon-containing polyphenylenes." Chemical Communications 54, no. 27 (2018): 3359–62. http://dx.doi.org/10.1039/c8cc00386f.

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Márquez, Irene R., Noelia Fuentes, Carlos M. Cruz, Virginia Puente-Muñoz, Lia Sotorrios, M. Luisa Marcos, Duane Choquesillo-Lazarte, et al. "Versatile synthesis and enlargement of functionalized distorted heptagon-containing nanographenes." Chemical Science 8, no. 2 (2017): 1068–74. http://dx.doi.org/10.1039/c6sc02895k.

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Dissertations / Theses on the topic "Heptagon"

1

Liu, Xiaoyang. "Generation of Heptagon-Containing Fullerene Structures by Computational Methods." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/83480.

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Since the discovery three decades ago, fullerenes as well as metallofullerenes have been extensively investigated. However, almost all known fullerenes follow the classical definition, that is, classic fullerenes are comprised of only pentagons and hexagons. Nowadays, more and more evidence, from both theoretical and experimental studies, suggests that non-classical fullerenes, especially heptagon-containing fullerenes, are important as intermediates in fullerene formation mechanisms. To obtain fundamental understandings of fullerenes and their formation mechanisms, new systematic studies should be undertaken. Although necessary tools, such as isomer generating programs, have been developed for classical fullerenes, none of them are able to solve problems related to non-classical fullerenes. In this thesis, existing theories and algorithms of classical fullerenes are generalized to accommodate non-classical fullerenes. A new program based on these generalized principles is provided for generating non-classical isomers. Along with this program, other tools are also attached for accelerating future investigations of non-classical fullerenes. In addition, research to date is also reviewed.
Master of Science
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2

Gérard, Léonard. "Programmer le parallélisme avec des futures en Heptagon un langage synchrone flot de données et étude des réseaux de Kahn en vue d'une compilation synchrone." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00929932.

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Les langages synchrones ont été fondés pour modéliser et implémenter les systèmes réactifs temps-réels critiques. Avec la complexité toujours croissante des systèmes contrôlés, la vitesse d'exécution devient un critère important. Nous sommes donc à la recherche d'une exécution parallèle, combinant efficacité et sûreté.Les langages synchrones ont toujours intégré la notion de parallélisme, mais ce, pour l'expressivité de la modélisation. Leurs compilations visent principalement les circuits ou la génération de code séquentiel. Tous ont une sémantique formelle, qui rend possible la distribution correcte du code. Mais la préservation de cette sémantique peut être un obstacle à l'efficacité du code généré, particulièrement s'il est nécessaire de préserver une notion d'instant global au système.Le modèle sémantique qui nous intéresse est celui des réseaux de Kahn. Ces réseaux modélisent des calculateurs distribués, communiquant au travers de files de taille non bornée. Dans ce cadre, la distribution ne demande aucune communication ni synchronisation supplémentaire. En considérant l'histoire des files de communication, la sémantique de Kahn permet de s'abstraire de l'exécution effective, tout en garantissant le déterminisme du calcul. Pour cela, chaque nœud du réseau doit avoir une sémantique fonctionnelle continue.Le langage que nous développons est Heptagon, un langage synchrone fonctionnel du premier ordre, déscendant de Lustre. Son compilateur est un prototype universitaire, apparenté à l'outil industriel Scade. Grâce à sa sémantique de Kahn, la distribution d'un programme Heptagon ne pose pas de question, son efficacité beaucoup plus.L'efficacité requiert de minimiser les synchronisations. Cela revêt deux aspects non indépendants. Avoir un découplage suffisant des calculs : il y a des délais dans les dépendances entre calculs. Avoir une granularité importante des calculs : un fort ratio temps de calcul sur fréquence de communication. Or la sémantique synchrone et les horloges d'un programme Heptagon reflètent exactement l'inverse. Elles permettent au programmeur de se contenter d'un découplage d'un instant et à chaque instant, au maximum une valeur est calculée. De plus, les instants sont typiquement courts, pour assurer que le système réagit rapidement.Des précédents travaux sur le sujet, nous tirons deux constats.Le premier est que nous souhaitons le contrôle du parallélisme par le programmeur, directement dans le code source. Il doit pouvoir maîtriser à quels instants il y a communication ou synchronisation. La solution que nous proposons dans ce manuscrit est l'utilisation des futures dans Heptagon. Ils fournissent ce pouvoir au programmeur, tout en restant des annotations qui peuvent être supprimées sans changer la sémantique dénotationnelle du programme.Le deuxième constat est que la question de la granularité des calculs est une question profonde, touchant en particulier aux questions de dépendance de données, de choix des horloges et de compilation modulaire. Heptagon, comme ses parents, restreint les réseaux de Kahn qui peuvent être écrits, de telle sorte que ces trois questions se traitent séparément. Pour mieux comprendre le lien entre ces éléments, nous revenons aux réseaux de Kahn. Notre principal résultat est la définition de la sous-classe des réseaux ordonnés réactifs. Ceux-ci sont les seuls pour lesquels nous pouvons décrire modulairement le comportement avec des horloges, sans restreindre les contextes d'appels. Ces réseaux ont une signature d'horloge en forme normale, qui maximise la granularité. Pour l'exprimer, nous introduisons les horloges entières, décrivant la communication de plusieurs valeurs en un seul instant. Nous appliquons ensuite nos résultats pour voir sous un nouveau jour Heptagon, Signal, les politiques des objets de Lucid Synchrone, mais aussi proposer une analyse pleinement modulaire de Lucy-n langage synchrone le plus fidèle aux réseaux de Kahn.
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Gérard, Léonard. "Programmer le parallélisme avec des futures en Heptagon un langage synchrone flot de données et étude des réseaux de Kahn en vue d’une compilation synchrone." Thesis, Paris 11, 2013. http://www.theses.fr/2013PA112202/document.

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Les langages synchrones ont été fondés pour modéliser et implémenter les systèmes réactifs temps-réels critiques. Avec la complexité toujours croissante des systèmes contrôlés, la vitesse d'exécution devient un critère important. Nous sommes donc à la recherche d'une exécution parallèle, combinant efficacité et sûreté.Les langages synchrones ont toujours intégré la notion de parallélisme, mais ce, pour l'expressivité de la modélisation. Leurs compilations visent principalement les circuits ou la génération de code séquentiel. Tous ont une sémantique formelle, qui rend possible la distribution correcte du code. Mais la préservation de cette sémantique peut être un obstacle à l'efficacité du code généré, particulièrement s'il est nécessaire de préserver une notion d'instant global au système.Le modèle sémantique qui nous intéresse est celui des réseaux de Kahn. Ces réseaux modélisent des calculateurs distribués, communiquant au travers de files de taille non bornée. Dans ce cadre, la distribution ne demande aucune communication ni synchronisation supplémentaire. En considérant l'histoire des files de communication, la sémantique de Kahn permet de s'abstraire de l'exécution effective, tout en garantissant le déterminisme du calcul. Pour cela, chaque nœud du réseau doit avoir une sémantique fonctionnelle continue.Le langage que nous développons est Heptagon, un langage synchrone fonctionnel du premier ordre, déscendant de Lustre. Son compilateur est un prototype universitaire, apparenté à l'outil industriel Scade. Grâce à sa sémantique de Kahn, la distribution d'un programme Heptagon ne pose pas de question, son efficacité beaucoup plus.L'efficacité requiert de minimiser les synchronisations. Cela revêt deux aspects non indépendants. Avoir un découplage suffisant des calculs : il y a des délais dans les dépendances entre calculs. Avoir une granularité importante des calculs : un fort ratio temps de calcul sur fréquence de communication. Or la sémantique synchrone et les horloges d'un programme Heptagon reflètent exactement l'inverse. Elles permettent au programmeur de se contenter d'un découplage d'un instant et à chaque instant, au maximum une valeur est calculée. De plus, les instants sont typiquement courts, pour assurer que le système réagit rapidement.Des précédents travaux sur le sujet, nous tirons deux constats.Le premier est que nous souhaitons le contrôle du parallélisme par le programmeur, directement dans le code source. Il doit pouvoir maîtriser à quels instants il y a communication ou synchronisation. La solution que nous proposons dans ce manuscrit est l'utilisation des futures dans Heptagon. Ils fournissent ce pouvoir au programmeur, tout en restant des annotations qui peuvent être supprimées sans changer la sémantique dénotationnelle du programme.Le deuxième constat est que la question de la granularité des calculs est une question profonde, touchant en particulier aux questions de dépendance de données, de choix des horloges et de compilation modulaire. Heptagon, comme ses parents, restreint les réseaux de Kahn qui peuvent être écrits, de telle sorte que ces trois questions se traitent séparément. Pour mieux comprendre le lien entre ces éléments, nous revenons aux réseaux de Kahn. Notre principal résultat est la définition de la sous-classe des réseaux ordonnés réactifs. Ceux-ci sont les seuls pour lesquels nous pouvons décrire modulairement le comportement avec des horloges, sans restreindre les contextes d'appels. Ces réseaux ont une signature d'horloge en forme normale, qui maximise la granularité. Pour l'exprimer, nous introduisons les horloges entières, décrivant la communication de plusieurs valeurs en un seul instant. Nous appliquons ensuite nos résultats pour voir sous un nouveau jour Heptagon, Signal, les politiques des objets de Lucid Synchrone, mais aussi proposer une analyse pleinement modulaire de Lucy-n langage synchrone le plus fidèle aux réseaux de Kahn
Synchronous languages are used to program critical reactive systems. Today, systems require to find a way to execute them safely and in parallel. Parallelism has always been part of synchronous langages, but for modeling purpose. Their formal semantics allow to distribute them, but preserving the semantics may be ressource costly and prevent good parallel execution.The Kahn networks model is of great interest. It models distributed computers, communicating through unbounded FIFOs, ensuring that the computed values are deterministic, without any need of added synchronization.We develop the langage Heptagon, a first order functional synchronous son of Lustre.The compiler is an academic prototype of the industrial tool Scade. Thanks to its Kahn semantics, it can be distributed. In order to be efficient, one need to maximize the decoupling of computations and maximize the computation granularity. However, synchronous langages allow for very tight computation coupling and usually require thin computation granularity to ensure reactivity of the system.We opt for two research directions. The first one is to give the control of the execution parallelism to the programer. To this mean, we add futures to the source langage Heptagon. They provide control over starting and end of parallel computations, while preserving the functional semantics. Moreover, we provide a compilation for embedded systems, using statically allocated memory. The second one is to study Kahn synchronous semantics to understand data dependencies and maximize granularity of the computations. This touches deeply to the synchronous languages, mixing the usually separated questions of causality and clock calculus. We define the class of reactive ordered Kahn networks. They are the one which may be modularly compiled and whose behavior may be expressed with a clock signature. Moreover, we show that their is a normal form for this signature, maximizing the granularity of the network. To express it, we extend clocks to integer clocks. Then we come back to the synchronous languages we know to understand how to use it. The result is fully used and explained on Lucy-n, the synchronous language closest to Kahn networks
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Hanousek, Ondřej. "Nová synagoga Frýdek-Místek." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2021. http://www.nusl.cz/ntk/nusl-443685.

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The thesis deals with a hypothetical project of a new building complex of a synagogue, a kosher restaurant and a community centre at the location of the former synagogue in Frýdek. The proposal includes a memorial of the destroyed synagogue and Jewish community, as well as the incorporation of the complex into the urban structure of the city. The project proposes a building distributed into three volumes. The restaurant and community centre are connected by an underground garage within a U-shaped floor plan. The buildings are axially symmetrical, white, with expressive rhythmical perforations of the facade. They surround the building of the synagogue in the shape of a seven-sided pyramid, which is clad with blue tempered steel and creates a strong contrast with the associated buildings. The whole complex is oriented towards the park and the chateau in Frýdek, from which it is clearly visible and thanks to its distinct volumetric and material expression and axially symmetrical composition creates a new landmark for the city.
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Liu, Junzhi, Shantanu Mishra, Carlo A. Pignedoli, Daniele Passerone, JoséI Urgel, Alberto Fabrizio, Thorsten G. Lohr, et al. "Open-Shell Nonbenzenoid Nanographenes Containing Two Pairs of Pentagonal and Heptagonal Rings." ACS Publications, 2019. https://tud.qucosa.de/id/qucosa%3A37009.

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Nonbenzenoid carbocyclic rings are postulated to serve as important structural elements toward tuning the chemical and electronic properties of extended polycyclic aromatic hydrocarbons (PAHs, or namely nanographenes), necessitating a rational and atomically precise synthetic approach toward their fabrication. Here, using a combined bottom-up in-solution and on-surface synthetic approach, we report the synthesis of nonbenzenoid open-shell nanographenes containing two pairs of embedded pentagonal and heptagonal rings. Extensive characterization of the resultant nanographene in solution shows a low optical gap, and an open-shell singlet ground state with a low singlet–triplet gap. Employing ultra-high-resolution scanning tunneling microscopy and spectroscopy, we conduct atomic-scale structural and electronic studies on a cyclopenta-fused derivative on a Au(111) surface. The resultant five to seven rings embedded nanographene displays an extremely narrow energy gap of 0.27 eV and exhibits a pronounced open-shell biradical character close to 1 (y0 = 0.92). Our experimental results are supported by mean-field and multiconfigurational quantum chemical calculations. Access to large nanographenes with a combination of nonbenzenoid topologies and open-shell character should have wide implications in harnessing new functionalities toward the realization of future organic electronic and spintronic devices.
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Barsi, Fabrício Ventura. "Isomerização do n-heptano sobre catalisadores bifuncionais Pt-Ni suportados em zeólitas BEA e FAU." Universidade Federal de São Carlos, 2009. https://repositorio.ufscar.br/handle/ufscar/3879.

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The objective of this paper was to study the influence of metal loading content on the properties of bimetallic catalysts, formed by Pt and Ni, supported on zeolite HUSY and HBEA. Another objective of this study was to infer possible mechanisms and reaction pathways. In this sense, were compared catalysts containing different contents and percentage of metals in the isomerization of n-heptane and characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), hydrogen chemisorption, temperature-programmed reduction (TPR). The results show that the catalyst with the total metal content of 180 μmol of Me.gcat -1 was the most active, suggesting that there is an optimum relationship between acid sites and metallic sites. The increase in total metal content of the solid from this value decreases the activity of the same, possibly due to decreased dispersion of metallic phase in the catalyst. In this content, the activity increases with the percentage of platinum, until the value of 50%. Increasing the percentage of platinum above this value, there is a slight decrease in activity of the catalyst. The catalysts with higher activity were almost 100% selective to the isomerization reaction. Through TEM and chemisorption of H2 there was a better metal dispersion on the catalyst 50Pt50Ni/HBEA with 180 μmol of Me.gcat -1 in agreement with the catalytic results. By EDX analysis performed during the characterization by scanning electron microscopy verified the presence of nickel, which was not found by EDX analysis in transmission electron microscopy, indicating that this element (metal or cationic) is dispersed in the zeolite matrix. The results of TPR, there was a greater reduction of Ni2+ ions when it is in the presence of Pt, evidenced by the shift reduction peak to lower temperatures in front of the bimetallic catalysts monometallic. The results also showed that the process of rapid reduction has not reduced completely cations Pt2+ and Ni2+ in the catalysts. It was realized a study of the influence of contact time of reagents (nhexane and n-heptane) with the catalyst and also the isomerization of 2-methylhexane in order to study the mechanism of isomerization.
O objetivo deste trabalho foi verificar a influência da carga metálica nas propriedades de catalisadores bimetálicos, formados por Pt e Ni, suportados na zeólita HUSY e HBEA. Outro objetivo desse trabalho foi o de inferir possíveis mecanismos e caminhos de reação. Nesse sentido, foram comparados catalisadores que contenham diferentes teores molares e diferentes proporções dos metais, na reação de isomerização de n-heptano e caracterizados por microscopia eletrônica de transmissão (MET), microscopia eletrônica de varredura (MEV), quimissorção de hidrogênio, redução à temperatura programada (RTP). Os resultados mostram que o catalisador com teor metálico de 180 μmol de Me.gcat -1 foi o mais ativo, sugerindo que existe uma relação ótima entre sítios ácidos e sítios metálicos. O aumento do teor de metal no sólido a partir desse valor diminui a atividade do mesmo, possivelmente devido à diminuição da dispersão da fase metálica no catalisador. Neste, a atividade aumenta com a porcentagem de platina, até o valor de 50%. Aumentando a porcentagem de platina acima desse valor, há uma ligeira diminuição na atividade do catalisador. Os catalisadores com maior atividade foram praticamente 100% seletivos à reação de isomerização. Através de MET e quimissorção de H2 verificou-se uma melhor dispersão metálica no catalisador 50Pt50Ni/HBEA com 180 μmol de Me.gcat -1 concordando com os resultados catalíticos. Por análise EDX realizada durante a caracterização por microscopia eletrônica de varredura verificou-se a presença do níquel, que não foi encontrado pela análise de EDX na microscopia eletrônica de transmissão, indicando que esse elemento (metálico ou catiônico) está disperso na matriz zeolítica. Nos resultados de RTP, verificou-se uma maior redutibilidade dos cátions Ni2+ quando este está na presença da Pt, evidenciado pelo deslocamento do pico de redução para menores temperaturas nos catalisadores bimetálicos frente aos monometálicos. Os resultados mostraram também que o processo de redução rápida não reduziu completamente os cátions Pt2+ e Ni2+ nos catalisadores. Realizou-se ainda um estudo da influência do tempo de contato dos reagentes (n-hexano e n-heptano) com o catalisador e também a isomerização do 2-metil-hexano visando o estudo do mecanismo da isomerização.
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Ferreira, Márcio Luís Oliveira. "Avaliação de catalisadores do tipo Pt-Re-Au/Al2 O3 na reforma de n-heptano." reponame:Repositório Institucional da UFBA, 2011. http://www.repositorio.ufba.br/ri/handle/ri/11169.

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Neste trabalho, foi estudado o efeito da adição de ouro em diferentes concentrações (0,01; 0,1 e 0,3%) na atividade, seletividade e estabilidade de catalisadores de platina (0,3 %) e rênio (0,3 %) suportados em alumina clorada, destinados à reforma catalítica de nafta de petróleo. As amostras foram preparadas por co-impregnação dos sais metálicos (ácido hexacloroplatínico, perrenato de amônia e ácido tetracloroaúrico) em alumina comercial e caracterizados por difração de raios X, redução termoprogramada e dessorção à temperatura programada de piridina. Além disso, os catalisadores foram avaliados na desidrogenação de cicloexano e isomerização de n-pentano, reações consideradas modelo das funções metálicas e ácidas, respectivamente. O desempenho catalítico das amostras foi avaliado na reforma de n-heptano. Após a reação de isomerização de n-pentano e reforma de n-heptano, os catalisadores foram analisados por oxidação termoprogramada. Observou-se que a adição de ouro facilita a redução da platina e este efeito aumentou com a diminuição do teor desse metal; um efeito inverso foi observado com os catalisadores de rênio. Nos catalisadores trimetálicos, a presença de 0,3% de ouro causa um aumento da interação dos metais entre si e com o suporte. A adição de ouro no catalisador monometálico de platina promoveu um decréscimo da atividade catalítica dos sítios metálicos, na reação de desidrogenação do cicloexano. Esse efeito aumentou com o teor de ouro e foi atribuído à provável formação de ligas com a platina, inativas da reação ou ao recobrimento de átomos de platina pelo ouro. A natureza e a quantidade dos sítios ácidos também foram alterados pela presença do ouro, mas não se observou uma relação simples essa propriedade e o teor desse metal. A atividade do catalisadores mono e bimetálicos de platina na reação de isomerização de n-pentano foi diminuída devido à adição de ouro. Por outro lado, a seletividade a isopentano dos catalisadores bimetálicos de platina e rênio foi pouco alterada com a adição de ouro. A adição de ouro ao catalisador de platina, associada ou não ao rênio, suportada em alumina conduziu a uma diminuição na conversão do n-heptano. Por outro lado, a adição de ouro influenciou pouco a seletividade a isômeros e a compostos aromáticos. A presença de ouro, de maneira geral, diminuiu a formação de coque, tanto na isomerização do n-pentano como na reação de reforma de n-heptano. Os catalisadores com teores mais elevados de ouro apresentaram menores quantidades de coque. A amostra trimetálica com 0,01% de ouro apresentou atividade similar à amostra bimetálica de platina e rênio na reação de reforma e n-heptano. Entretanto, a presença de 0,3% de ouro no catalisador bimetálico de platina e rênio inibiu a formação de coque durante as reações de isomerização de n-pentano e de reforma de n-heptano tornando-o, dessa forma, um sistema promissor na reação de reforma de nafta para a produção de gasolina com elevado índice de octanas.
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Zanoni, Élton Torres. "Avaliação de nanoestruturas de sílica na liberação controlada de feromônios repelentes de abelha." reponame:Repositório Institucional da UNESC, 2018. http://repositorio.unesc.net/handle/1/5856.

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Dissertação de Mestrado, apresentada ao Programa de Pós-Graduação em Ciência e Engenharia de Materiais da Universidade do Extremo Sul Catarinense, UNESC, para a obtenção do título de Mestre em Ciência e Engenharia de Materiais.
Nanomateriais têm sido empregados em diversas funções nas mais variadas áreas do conhecimento. Um campo de aplicação que ganha espaço nos últimos anos é o uso da nanotecnologia na agricultura, visando amenizar os impactos do avanço populacional e a escassez dos recursos naturais atuando no controle de pragas e gerenciamento de agroquímicos. Neste estudo foram avaliadas duas nanoestruturas para o carregamento de feromônios repelente de abelhas, sendo essas nanoestruturas nanopartículas de sílica mesoporosas e do tipo Stöber. Os nanomateriais foram sintetizados via método Sol-Gel e caracterizados por difração de raios-X, microscopia eletrônica de varredura e de transmissão, análise termogravimétrica, espectroscopia de infravermelho e método BET. As nanopartículas mesoporosas apresentaram-se com área superficial quase 5 vezes maior que a do tipo Stöber. A nanoestrutura mesoporosa apresentou a função desejada para a proposta do trabalho se tornando o principal alvo do estudo para os testes cinéticos dos feromônios acetato de octila e 2-heptanona. Os ferômonios foram encapsulados nos percentuais de 10, 20 e 40% e os ensaios cinéticos ocorreram por dois métodos apresentando diferenças nas características de liberação para os feromônios. As nanopartículas influenciaram de forma significativa na cinética de liberação dos feromônios retardando a taxa de liberação dependendo também das características moleculares dos feromônios, como tamanho de cadeia e polaridade. O acetato de octila demonstrou ser mais eficiente em seu encapsulamento na nanoestrutura, devido a sua polaridade que favorece a interação com grupos silanóis encontrados na superfície da nanopartícula. Dos testes cinéticos concluiu-se que as nanopartículas mesoporosas prolongaram a atividade de liberação dos feromônios permanecendo essa função por vários dias.
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Weihofen, Wilhelm. "Strukturelle Basis für die kooperative Bindung des o-Repressors [Omega-Repressors] an direkte und invertierte Wiederholungen von DNA-Heptaden." [S.l.] : [s.n.], 2005. http://www.diss.fu-berlin.de/2005/254/index.html.

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BESSON, ISABELLE. "Etude du comportement des spores de penicillium roquefortii au cours de la bioconversion de l'acide octanoique en heptanone-2." Clermont-Ferrand 2, 1993. http://www.theses.fr/1993CLF21537.

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Une etude bibliographique fait le point sur les diverses possibilites d'utilisation des bioconversions et des biotransformations pour l'obtention de produits naturels, et sur les perspectives de mise en uvre de ces techniques au niveau industriel. Apres un rappel concernant les connaissances actuelles dans le domaine de la production d'arome de fromage bleu, l'analyse du comportement des spores de penicillium roquefortii au cours de la synthese d'heptanone-2 a partir de l'acide octanoique est envisagee. La methodologie utilisee comporte deux volets; le premier s'interesse a la caracterisation des echanges de solutes entre les cellules et le milieu. Un protocole de determination des concentrations intracellulaires globales en metabolites est teste et mis au point; les donnees concernant l'acide gras sont utilisees pour le calcul du ph intracellulaire moyen. L'ecart constate entre ces resultats et ceux obtenus par rmn#3#1p est attribue a une repartition heterogene du substrat au sein de la cellule. Ce compose s'accumule dans les membranes conidiennes, puis migre dans le cytoplasme par un mecanisme actif mettant en jeu une atpase entrainant un efflux de protons hors du milieu cellulaire. Le second volet concerne l'analyse des bilans matiere ainsi que le calcul des vitesses de production d'atp. Il met en evidence une germination des spores au cours de reactions realisees en fed-batch. Les conidies natives sont les plus actives, l'optimisation d'un processus repose sur l'amelioration des vitesses initiales et sur un allongement de la duree de vie de ce biocatalyseur. Ce resultat peut etre obtenu en bloquant le cycle de krebs, soit en utilisant un inhibiteur specifique, soit en adaptant la composition du milieu reactionnel de maniere a obtenir une concentration cytoplasmique en acide gras suffisante pour bloquer le fonctionnement de cette voie metabolique
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Books on the topic "Heptagon"

1

Muhammad, Sahri. Pemberdayaan tujuh (saptagon/heptagon) akses rumah tangga miskin: Penguatan ekonomi rumah tangga untuk penanggulangan kemiskinan dan kesejahteraan. Malang, Indonesia: UB Press, 2014.

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Heptagone. Paris: Robert Laffont, 2012.

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Ciezki, Helmut. Untersuchung des selbstzündverhaltens von N-Heptan/Luft-Gemischen unter hohem Druck. Aachen: Verlag der Augustinus-Buchh., 1990.

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Shea, James T. Working With Numbers: Heptagon Book. 2nd ed. Steck-Vaughn Co, 1987.

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Chen, Fen. Regular Polygons: Applied New Theory of Trisection to Construct a Regular Heptagon for Centuries in the History of Mathematics. International School Math & Sciences Institut, 2001.

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Une Loge Revele Heptagone L'Initiation Feminine: Une voie exceptionnelle de realisation pour la femme d'aujourd'hui. Monaco: Le Rocher, 1986.

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(Lodge), Heptagone, ed. L' Initiation féminine: Une voie exceptionnelle de réalisation pour la femme d'aujourd'hui. Monaco: Le Rocher, 1986.

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Heptalón para princesas. Cuba: Editorial Gente Nueva, 2011.

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Book chapters on the topic "Heptagon"

1

Winter, C. J. "The Energy Heptagon." In Solar Power Plants, 1–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-61245-9_1.

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Robu, Judit, Tetsuo Ida, Dorin Ţepeneu, Hidekazu Takahashi, and Bruno Buchberger. "Computational Origami Construction of a Regular Heptagon with Automated Proof of Its Correctness." In Automated Deduction in Geometry, 19–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11615798_2.

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Priya, A., M. Saravanan, D. Balasubramaniam, A. Subahar, and V. Purushothaman. "A Compact Vertex Fed Heptagon Monopole Antenna in a Wide Diamond Slot for UWB Applications." In Lecture Notes in Networks and Systems, 561–72. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7345-3_48.

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Gooch, Jan W. "Heptanol-2." In Encyclopedic Dictionary of Polymers, 364. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_5903.

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Wohlfarth, Ch. "Viscosity of heptan-1-ol." In Supplement to IV/18, 487–89. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75486-2_270.

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Wohlfarth, Ch. "Viscosity of heptan-2-ol." In Supplement to IV/18, 490. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75486-2_271.

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Wohlfarth, Christian. "Viscosity of heptan-1-ol." In Viscosity of Pure Organic Liquids and Binary Liquid Mixtures, 294. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49218-5_268.

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Wohlfarth, Christian. "Viscosity of heptan-2-ol." In Viscosity of Pure Organic Liquids and Binary Liquid Mixtures, 295. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49218-5_269.

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Sankar Ponnapalli, V. A., and P. V. Y. Jayasree. "Heptagonal Fractal Antenna Array for Wireless Communications." In Lecture Notes in Electrical Engineering, 387–94. New Delhi: Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2728-1_34.

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Wohlfarth, Ch. "Refractive index of heptan-2-one." In Refractive Indices of Pure Liquids and Binary Liquid Mixtures (Supplement to III/38), 407. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75291-2_246.

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Conference papers on the topic "Heptagon"

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Elapolu, Mohan S. R., and Alireza Tabarraei. "Impact of Grain Boundaries on the Heat Conductivity of Mono-Layer Hexagonal Boron Nitride." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71415.

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Reverse nonequilibrium molecular dynamics modeling is used to study the influence of grain boundaries on thermal properties of mono–layer hexagonal boron nitride (h–BN) nanoribbons. We consider symmetric grain boundaries consisting of series of pentagon–heptagon ring defects. Our results show a jump in the temperature profile at the location of grain boundary. The jump is consistently increasing with increase in the mis-orientation angle of nanoribbons with grain boundaries. This is attributed to an increase in the pentagon–heptagon defect density along the grain boundary. The temperature profile is used to calculate the Kapitza (interface) conductance of grain boundaries as a function of the misorientation angle of grain boundaries. Our results show that Kapitza conductance of the grain boundaries decreases with increase in the misorientation angle. Zigzag nanoribbons show slightly higher Kapitza conductance than armchair nanoribbons.
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Shafiqzzaman, Md, Anurak Udomvech, and Teerakiat Kerdcharoen. "Theoretical studies of pentagon-heptagon pair defects in carbon nanotube junctions." In 7th IEEE International Conference on Nanotechnology. IEEE, 2007. http://dx.doi.org/10.1109/nano.2007.4601250.

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Painam, Surendra kumar, and Chandra Mohan Bhuma. "A Compact Hexa-Band and UWB Antenna Using Heptagon and Nonagon Rings with Vertex Feed." In 2018 IEEE Indian Conference on Antennas and Propogation (InCAP). IEEE, 2018. http://dx.doi.org/10.1109/incap.2018.8770812.

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Duhr, Claude. "Hexagons, Heptagons and Octogons in N=4SYM." In “Loops and Legs in Quantum Field Theory ” 11th DESY Workshop on Elementary Particle Physics. Trieste, Italy: Sissa Medialab, 2013. http://dx.doi.org/10.22323/1.151.0027.

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Došlić, Tomislav. "The Golden Section's heptagonal connections." In 3rd Croatian Combinatorial Days. Faculty of Civil Engineering, University of Zagreb, 2021. http://dx.doi.org/10.5592/co/ccd.2020.02.

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Sanchez-Bernabe, F. J., and Salcedo Javier. "Fullerenes with Heptagonal Rings An Overview." In Third International Conference on Control, Automation and Systems Engineering (CASE-13). Paris, France: Atlantis Press, 2013. http://dx.doi.org/10.2991/case-13.2013.13.

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Ostromoukhov, Victor. "Chromaticity gamut enhancement by heptatone multicolor printing." In IS&T/SPIE's Symposium on Electronic Imaging: Science and Technology, edited by Ricardo J. Motta and Hapet A. Berberian. SPIE, 1993. http://dx.doi.org/10.1117/12.149036.

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Sangal, Atul, and Rajesh Kumar Saini. "Fully Fuzzy Transportation Problem with Heptagonal Intutionistic Fuzzy Number." In 2018 4th International Conference on Computing Communication and Automation (ICCCA). IEEE, 2018. http://dx.doi.org/10.1109/ccaa.2018.8777653.

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Hasan, Md Mahamudul, Shuvo Sen, Md Juwel Rana, Bikash Kumar Paul, Md Ahsan Habib, Golam Moktader Daiyan, and Kawsar Ahmed. "Heptagonal Photonic Crystal Fiber Based Chemical Sensor in THz Regime." In 2019 Joint 8th International Conference on Informatics, Electronics & Vision (ICIEV) and 2019 3rd International Conference on Imaging, Vision & Pattern Recognition (icIVPR). IEEE, 2019. http://dx.doi.org/10.1109/iciev.2019.8858555.

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Sanchez-Bernabe, Francisco Javier, and Javier Salcedo. "On A Fullerene with 458 Carbons-Containing 8 heptagonal rings." In 2015 International Conference on Modeling, Simulation and Applied Mathematics. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/msam-15.2015.74.

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Reports on the topic "Heptagon"

1

Nahman, N. S. Dielectric constant measurements on n-heptane and 2-heptanone. Office of Scientific and Technical Information (OSTI), January 1994. http://dx.doi.org/10.2172/527432.

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Arfsten, Darryl P., Linda V. Kane, and Kenneth R. Still. Derivation of Exposure Duration-Specific Occupational Exposure Limits (OELS) for 4,6-Dimethyl-2-Heptanone (CAS# 19549-80-5). Fort Belvoir, VA: Defense Technical Information Center, July 2002. http://dx.doi.org/10.21236/ada414142.

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