Relevant bibliographies by topics / Heptagon

Contents

  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: 21 June 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Heptagon.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Heptagon"

1

Sánchez-Bernabe, Francisco J. "Study of fullerenes C126 and C156 with seven heptagon rings." Journal of Physics: Conference Series 2321, no. 1 (2022): 012028. http://dx.doi.org/10.1088/1742-6596/2321/1/012028.

Full text
Abstract:
Abstract We consider fullerenes C126 and C156, both of them with seven heptagon rings. The first of them is C126 with 19 pentagons, and 39 hexagons. It is also considered C156 with 19 pentagons, and 54 hexagons. From previous work, a couple of fullerenes, C130 and C134, are mentioned for comparative reasons. These two fullerenes also contain seven heptagon rings. Fullerene C130 is constituted of 19 pentagons, and 41 hexagons. On the other hand, fullerene C134 has 19 pentagons, and 43 hexagons. Therefore, the four fullerenes considered, with seven heptagon rings, also share the property that, the number of pentagons in each of them, is 19. This fact is a consequence of a couple of equations that relates the number of pentagons, hexagons, and heptagons contained in a fullerene. Classical fullerenes contain only pentagons and hexagons, and the more familiar example is C60 with 20 hexagons, and 12 pentagons. Actually, all classical fullerenes have 12 pentagons, regardless of how many hexagons are involved. Besides this type of molecules, there exists nonclassical fullerenes, where another type of ring is presented, like squares, or heptagons. In this paper, fullerenes with 126, 130, 134, and 156 carbons are considered, with seven heptagons, and as a consequence, all them contain 19 pentagons, and they have 39, 41, 43, and 54 hexagons, respectively. Future work would focus on finding fullerenes with a different number of carbons, and hexagons, but with 7 heptagons, and 19 pentagons. Thus, fullerene C128 of this type, should contain 40 hexagons.
APA, Harvard, Vancouver, ISO, and other styles
2

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

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
3

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 (2021): 20. http://dx.doi.org/10.24014/jsms.v7i1.11579.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
4

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

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

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

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Prianasari, Eka Ningrum, and Isnaini Rosyida. "Nilai Ketakteraturan Sisi Total pada Graf Rantai Heptagon dan Graf Rantai Heptagon dengan Dua Sisi Pendant." Unnes Journal of Mathematics 11, no. 1 (2022): 38–43. http://dx.doi.org/10.15294/ujm.v11i1.35333.

Full text
Abstract:
Diketahui sebuah graf G dengan himpunan titik tak kosong V(G) dan himpunan sisi E(G). Suatu pelabelan dikatakan pelabelan-k total tak teratur sisi jika setiap dua sisi berbeda memenuhi bobot sisi yang berbeda, dengan bobot suatu sisi adalah jumlah dari label sisi tersebut ditambah jumlah semua titik yang terkait pada sisi tersebut. Nilai ketakteraturan sisi total (total edge irregularity strength) graf G, yang dinotasikan dengan tes(G) adalah minimum k atau label terbesar minimum yang digunakan untuk melabeli titik dan sisi graf G dengan pelabelan total tak teratur sisi. Pada artikel ini, penulis menyelidiki nilai ketakteraturan sisi total pada graf rantai heptagon dan graf rantai heptagon dengan dua sisi pendant . Hasil dari penelitian ini yaitu nilai ketakteraturan sisi total pada graf rantai heptagon adalah batas atas dari 7r ditambah 2 kemudian dibagi 3, dan nilai ketakteraturan sisi total pada graf rantai heptagon dengan dua sisi pendant adalah batas atas dari 9r ditambah 2 kemudian dibagi 3.
APA, Harvard, Vancouver, ISO, and other styles
8

Prayogi, Gusti Dian, and Widiar Onny Kurniawan. "The Influence of the Fraud Heptagon on Fraud Levels in Indonesian State-Owned Enterprises: The Moderating Role of the Whistleblowing System." Majalah Ekonomi 31, no. 1 (2025): 49–59. https://doi.org/10.36456/majeko.vol31.no1.a10143.

Full text
Abstract:
This study aims to explore the correlation between the theoretical construct of the Fraud Heptagon and the intensity of fraudulent practices in Indonesian State-Owned Enterprises (SOEs), as well as the moderating role of the whistleblowing system in this relationship. The Fraud Heptagon is a concept that expands upon previous theories, such as the Fraud Triangle and Fraud Diamond, by incorporating additional elements that influence fraud occurrence, namely financial pressure, opportunity, rationalization, capability, arrogance, and greed. The whistleblowing system is identified as a control mechanism that can mitigate fraud risks within organizations by enhancing transparency and accountability. This research adopts a quantitative approach, systematically analyzing data to identify patterns in the relationships between variables. The analysis method employed is Moderated Regression Analysis (MRA), a statistical technique that allows for testing interaction effects between the independent variable and the moderating variable in influencing the dependent variable. Data processing is conducted using SPSS version 26, which provides advanced analytical capabilities for estimating regression coefficients and testing the significance of relationships. Data collection is carried out through a survey targeting SOE auditors using purposive sampling. The findings indicate that the Fraud Heptagon has a positive and significant influence on the level of fraud (β = 0.42; Sig. 0.001), suggesting that the more complex the factors within the Fraud Heptagon, the higher the potential for fraudulent practices. The whistleblowing system is found to have a negative and significant impact on fraud (β = -0.35; Sig. 0.002), demonstrating that an effective reporting system can suppress fraudulent activities within an organization. Moreover, the moderating effect of the whistleblowing system on the relationship between the Fraud Heptagon and fraud is also significant and negative (β = -0.28; Sig. 0.004), indicating that the more effective the whistleblowing system, the weaker the relationship between the Fraud Heptagon and fraud levels
APA, Harvard, Vancouver, ISO, and other styles
9

White, Tony. "The Life Script Heptagon." International Journal of Transactional Analysis Research & Practice 13, no. 1 (2022): 53–61. http://dx.doi.org/10.29044/v13i1p53.

Full text
Abstract:
The life script heptagon, developed by the author, is described to show how seven elements, all seven aspects of human personality – behaviour, feelings, thoughts, body holding patterns, habits, beliefs and attitudes, and early decisions – fit together geometrically so that they reinforce and support each other and make it hard for people to change their life scripts. These elements are then related to the ways in which different psychotherapies tend to work with them, and explanations are given of why the geometric nature of the model means that several aspects need to change because otherwise the remaining elements are reinforcing the unhelpful patterns.
 Editorial Note: This is an example of the saying ‘great minds think alike’ – this version of a heptagon was being developed over several years and the author was unaware that Benedetti, Benelli and Zanchetta (2020) had been developing a similar geometrical shape with different elements. Benedetti et al. were also unaware that the version described in this article was being developed. (Benedetti et al article is in this journal, Vol. 11, Issue 1 at https://doi.org/10.29044/v11i1p13)
APA, Harvard, Vancouver, ISO, and other styles
10

Lestari, Sari, and Siti Mutmainah. "Academic Fraud Enigma among Accounting Vocational School Students: Insights from Heptagon Framework and Relevance of Artificial Intelligence." Jurnal Dinamika Akuntansi dan Bisnis 11, no. 2 (2024): 207–28. https://doi.org/10.24815/jdab.v11i2.37442.

Full text
Abstract:
This study aims to investigate the influence of heptagon theory elements, including pressure, opportunity, rationalization, competency, arrogance, greed, and ignorance, on academic fraud. Additionally, the study seeks to assess the moderating effect of Chat GPT usage, an artificial intelligence application, on the relationship between each element of heptagon theory and academic fraud. Employing a quantitative approach, the study focuses on the population of accounting students in vocational high schools, with a sample of 120 respondents meeting representativeness criteria calculated using the Cochran formula. Primary data is collected through respondents' responses obtained via a Google Form questionnaire. The results indicate that rationalization, competency, and greed exert has a significant influence on academic fraud among accounting students, whereas pressure, opportunity, arrogance, and ignorance do not exhibit a significant impact. Chat GPT, representing artificial intelligence, does not moderate the relationship between heptagon theory elements and academic fraud.
APA, Harvard, Vancouver, ISO, and other styles
More sources

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.

Full text
Abstract:
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.<br>Master of Science
APA, Harvard, Vancouver, ISO, and other styles
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.

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
3

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.

Full text
Abstract:
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<br>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
APA, Harvard, Vancouver, ISO, and other styles
4

Hanousek, Ondřej. "Nová synagoga Frýdek-Místek." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2021. http://www.nusl.cz/ntk/nusl-443685.

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
5

Liu, Junzhi, Shantanu Mishra, Carlo A. Pignedoli, et al. "Open-Shell Nonbenzenoid Nanographenes Containing Two Pairs of Pentagonal and Heptagonal Rings." ACS Publications, 2019. https://tud.qucosa.de/id/qucosa%3A37009.

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
6

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.

Full text
Abstract:
Made available in DSpace on 2016-06-02T19:55:26Z (GMT). No. of bitstreams: 1 2782.pdf: 4553627 bytes, checksum: f73cfcf1828cc709aa70c31e60f46159 (MD5) Previous issue date: 2009-12-09<br>Financiadora de Estudos e Projetos<br>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 &#956;mol 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 &#956;mol 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.<br>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 &#956;mol 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 &#956;mol 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.
APA, Harvard, Vancouver, ISO, and other styles
7

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.

Full text
Abstract:
127f.<br>Submitted by Ana Hilda Fonseca (anahilda@ufba.br) on 2013-04-04T14:19:14Z No. of bitstreams: 11 SUMÁRIO.pdf: 387928 bytes, checksum: 97572aa6a0c6f9e1603c58e13445c4b0 (MD5) SUGESTÕES PARA TRABALHOS FUTUROS.pdf: 185948 bytes, checksum: a4cf4835add63bfe3410965e6ed99060 (MD5) REVISÃO BIBLIOGRÁFICA.pdf: 613262 bytes, checksum: 899ef505497cce7f776561ff2903c41b (MD5) RESUMO.pdf: 90910 bytes, checksum: e6ff997e49241b2db759eb772d78d856 (MD5) RESULTADOS E DISCUSSÃO.pdf: 1410244 bytes, checksum: 0fbf4fad7b7711daf673de9304838f4d (MD5) REFERÊNCIAS BIBLIOGRÁFICAS.pdf: 300838 bytes, checksum: 62907154b73fa8bcd4beeee4fd354b30 (MD5) MATERIAIS E MÉTODOS.pdf: 429719 bytes, checksum: 9268517f88f142b52bb2143340091ae0 (MD5) INTRODUÇÃO.pdf: 119594 bytes, checksum: 2fcf034b8b72f623889327317c5a1acf (MD5) FICHA CATALOGRÁFICA.pdf: 138900 bytes, checksum: 286ccabdd5fdfac3f47751be3a687469 (MD5) CONCLUSÕES.pdf: 116706 bytes, checksum: 36835ca113d33c96d635431e3f74e4b5 (MD5) ANEXO.pdf: 295248 bytes, checksum: 636ae63d87a78c28a1aa23421f0cc552 (MD5)<br>Rejected by Ana Hilda Fonseca(anahilda@ufba.br), reason: Pedir para o aluno colocar em um só arquivo. on 2013-04-29T15:49:36Z (GMT)<br>Submitted by Ana Hilda Fonseca (anahilda@ufba.br) on 2013-05-21T16:00:42Z No. of bitstreams: 1 Tese Márcio Luís O Ferreira.pdf: 3909041 bytes, checksum: c22e89a198f2b436130cf2b453fd102b (MD5)<br>Approved for entry into archive by Ana Hilda Fonseca(anahilda@ufba.br) on 2013-05-21T16:02:17Z (GMT) No. of bitstreams: 1 Tese Márcio Luís O Ferreira.pdf: 3909041 bytes, checksum: c22e89a198f2b436130cf2b453fd102b (MD5)<br>Made available in DSpace on 2013-05-21T16:02:17Z (GMT). No. of bitstreams: 1 Tese Márcio Luís O Ferreira.pdf: 3909041 bytes, checksum: c22e89a198f2b436130cf2b453fd102b (MD5) Previous issue date: 2011<br>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.<br>Salvador
APA, Harvard, Vancouver, ISO, and other styles
8

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.

Full text
Abstract:
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.<br>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.
APA, Harvard, Vancouver, ISO, and other styles
9

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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
More sources

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. UB Press, 2014.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

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

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

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

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Edmunds, Jerry. Heptagon. Independently Published, 2019.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Corn. Heptagon Calendar 2022. Independently Published, 2021.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

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

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Heptagone. Robert Laffont, 2012.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

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.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Heptalón para princesas. Editorial Gente Nueva, 2011.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Christian Hack - Heptagonal Sculptures. VanSpijk, 2020.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Heptagon"

1

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

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

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. Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11615798_2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Sumathi, K., S. Thenmozhi, and V. Seethalakshmi. "Design and Analysis of Heptagon-Shaped Multiband Antennas with Multiple Notching for Wireless Applications." In Microstrip Antenna Design for Wireless Applications. CRC Press, 2021. http://dx.doi.org/10.1201/9781003093558-17.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

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. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7345-3_48.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Lide, David R. "2-Heptanol." In Handbook of Organic Solvents. CRC Press, 2024. http://dx.doi.org/10.1201/9781003575191-255.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Lide, David R. "1-Heptanol." In Handbook of Organic Solvents. CRC Press, 2024. http://dx.doi.org/10.1201/9781003575191-254.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Lide, David R. "3-Heptanol." In Handbook of Organic Solvents. CRC Press, 2024. http://dx.doi.org/10.1201/9781003575191-256.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

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

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Howard, Philip H. "2-Heptanone." In Handbook of Environmental Fate and Exposure Data For Organic Chemicals, Volume V. CRC Press, 2024. http://dx.doi.org/10.1201/9781003575573-37.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Hashim, Mohd Ekram Alhafis, Muhammad Zaffwan Idris, and Che Soh Said. "The Heptagon of AUX Model: Development of a Synergising Model on Aesthetic Experience and User Experience through the Fuzzy Delphi Method Towards Augmented Reality Comics." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-99188-3_19.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Heptagon"

1

Wang, Yang, Yong Yang, Qi Zhang, et al. "Laser beam mode shaper with heptagonal core anti-resonant hollow-core fiber." In Eighth Workshop on Specialty Optical Fibers and their Applications, edited by Pavel Peterka, John Ballato, Kyriacos Kalli, and Alexis Mendez. SPIE, 2025. https://doi.org/10.1117/12.3056277.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Lakade, Nilesh A., and Shankar D. Nawale. "Design of Heptagonal-Shaped 2.45 GHz Omni-directional Antenna for RF Energy Harvesting Application." In 2024 15th International Conference on Computing Communication and Networking Technologies (ICCCNT). IEEE, 2024. http://dx.doi.org/10.1109/icccnt61001.2024.10724644.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

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.

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
4

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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Handoko, Bambang Leo, Gladys Fanny Natalya, and Edwin Hendra. "Analysis of Factors Impacting Fraudulent Financial Reporting Based on Fraud Heptagon Model on Indonesian's State-Owned Enterprises." In ICMECG 2022: 2022 The 9th International Conference on Management of e-Commerce and e-Government. ACM, 2022. http://dx.doi.org/10.1145/3549823.3549829.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Handoko, Bambang Leo, Regine Nathasa Anya Putri, and Sylvia Wijaya. "Analysis of Fraudulent Financial Reporting based on Fraud Heptagon Model in Transportation and Logistic Industry listed on IDX during Covid-19 Pandemic." In ICSEB 2022: 2022 6th International Conference on Software and e-Business. ACM, 2022. http://dx.doi.org/10.1145/3578997.3579003.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Spremić, Siniša. "NOVE GRANICE UNAPREĐENOG TROUGLA ZA ANALIZU GASOVA RASTVORENIH U ULJU SA PRIMERIMA KVAROVA." In 36. Savetovanja CIGRE Srbija 2023 Fleksibilnost elektroenergetskog sistema. Srpski nacionalni komitet Međunarodnog saveta za velike električne mreže CIGRE Srbija, 2023. http://dx.doi.org/10.46793/cigre36.0135s.

Full text
Abstract:
For many years, various methods have been used for the dissolved gas in oil analysis: Dernenburg, Rogers relations, MSS (Mueller, Schliesinger and Soldner), Duval triangles, Duval pentagons, Universal triangle, Key gas, Logarithmic nomograph, IEC relations, Gas pattern analysis method, Japan ETRA diagnostic diagram, Heptagon... Basically most methods deal with single or pure faults. The Duval Triangle has had significant changes in the boundaries between all areas with the appearance of areas of multiple faults of electrical discharge and overheating (DT) in the existing Duval Triangle 1. A newer method is the Improved Triangle which improves upon the modern Duval Triangle 1. The borders between fault areas of original Improved Triangle were partially modified by further consideration of previous and more recent failure cases. The main change is the use of lines that do not go from page to page, but rather go from the vertex of the triangle to the opposite page. This means that the ratios of two gases (possibly three gases in the case of the Improved Triangle because there are two gases on one side of the triangle) give the border between two types of faults. Another significant change is the reduction in the size of the thermal faults areas. The original Improved Triangle and the new Improved Triangle are shown and discussed. Both are intended for mineral insulating oils. Several recent examples of transformer faults are presented, showing the interpretation of the Improved Triangle and Duval Triangle 1.
APA, Harvard, Vancouver, ISO, and other styles
9

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

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

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.

Full text
APA, Harvard, Vancouver, ISO, and other styles

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), 1994. http://dx.doi.org/10.2172/527432.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

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). Defense Technical Information Center, 2002. http://dx.doi.org/10.21236/ada414142.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Heptagon' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography