Bibliografías temáticas / Composite-order groups

Literatura académica sobre el tema "Composite-order groups"

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Publicado: 4 de mayo de 2024

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Artículos de revistas sobre el tema "Composite-order groups"

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ZHOU, Fu-Cai, Jian XU, Lan-Lan WANG, Chen CHEN y Fu-Xiang LI. "A Group Signature in the Composite Order Bilinear Groups". Chinese Journal of Computers 35, n.º 4 (16 de noviembre de 2012): 654–63. http://dx.doi.org/10.3724/sp.j.1016.2012.00654.

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WILDON, MARK. "Permutation groups containing a regular abelian subgroup: the tangled history of two mistakes of Burnside". Mathematical Proceedings of the Cambridge Philosophical Society 168, n.º 3 (27 de mayo de 2019): 613–33. http://dx.doi.org/10.1017/s0305004119000033.

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AbstractA group K is said to be a B-group if every permutation group containing K as a regular subgroup is either imprimitive or 2-transitive. In the second edition of his influential textbook on finite groups, Burnside published a proof that cyclic groups of composite prime-power degree are B-groups. Ten years later, in 1921, he published a proof that every abelian group of composite degree is a B-group. Both proofs are character-theoretic and both have serious flaws. Indeed, the second result is false. In this paper we explain these flaws and prove that every cyclic group of composite order is a B-group, using only Burnside’s character-theoretic methods. We also survey the related literature, prove some new results on B-groups of prime-power order, state two related open problems and present some new computational data.
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Wang, Biao, Xue Wang, Futang Hu, Xiangyu Wang, Zhongji Yang, Xiuyu Zhu, Gen Li y Keliang Wang. "Study on the Properties of Compound Surfactants with PO Groups". Energies 17, n.º 2 (20 de enero de 2024): 513. http://dx.doi.org/10.3390/en17020513.

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The compound surfactant system has considerable development prospects for improving oil recovery. A synergistic effect can be achieved through the orderly arrangement of the two surfactants on the interface, which can make up for the performance defects of a single surfactant. In this paper, the effects of the number of propylene oxides (PO) in composite surfactants on interfacial tension and emulsion stability were systematically studied. The results showed that the solubility of composite surfactants was significantly improved under high-salinity conditions by adding anionic–nonionic surfactants to a single anionic surfactant. The interfacial tension of composite surfactants shows a V-shaped change of first decreasing and then increasing with the increase in PO groups. As the number of PO groups increases, the emulsion first increases and then decreases. Among the series of composite surfactants, LBAS/C12PO10S has the lowest interfacial tension, reaching the order of 10−3 mN/m, and the emulsion formed by it exhibits superior stability. This indicates that the synergistic effect of the two surfactants can be improved by adjusting the number of PO groups. Furthermore, the LBAS/C12PO10S composite system can be mixed with crude oil to form Winsor III microemulsion, which has great potential for application in enhanced oil recovery via chemical flooding.
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Okazaki, Hiroyuki, Hiroshi Yamazaki y Yasunari Shidama. "Isomorphisms of Direct Products of Finite Commutative Groups". Formalized Mathematics 21, n.º 1 (1 de enero de 2013): 65–74. http://dx.doi.org/10.2478/forma-2013-0007.

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Summary We have been working on the formalization of groups. In [1], we encoded some theorems concerning the product of cyclic groups. In this article, we present the generalized formalization of [1]. First, we show that every finite commutative group which order is composite number is isomorphic to a direct product of finite commutative groups which orders are relatively prime. Next, we describe finite direct products of finite commutative groups
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5

Janko, Zvonimir. "Finite 2-groups all of whose maximal cyclic subgroups of composite order are self-centralizing". Journal of Group Theory 10, n.º 1 (26 de enero de 2007): 1–4. http://dx.doi.org/10.1515/jgt.2007.001.

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LU, GONGRU, BING-LIN YOUNG y XINMIN ZHANG. "A SCHEME FOR COMPLEMENTARITY AND HIGGS PHASE ANALYSES". Modern Physics Letters A 05, n.º 08 (30 de marzo de 1990): 531–42. http://dx.doi.org/10.1142/s0217732390000615.

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We introduce a simple dynamical scheme to supplement the complementarity and Higgs phase analyses of composite models with semi-simple metacolor groups. The critical couplings which signal the dynamical breakdown of the various simple groups contained in the metacolor semi-simple group determine the order of appearance of the condensates of the simple groups. Together with the Higgs phase analysis, it helps to determine the global symmetry of the fermion composite. The global symmetry group will eventually be gauged to form the low energy dynamical symmetry group of the composite.
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Kim, Mijoo, Deuk-Won Jo, Shahed Al Khalifah, Bo Yu, Marc Hayashi y Reuben H. Kim. "Shear Bond Strength of Composite Diluted with Composite-Handling Agents on Dentin and Enamel". Polymers 14, n.º 13 (30 de junio de 2022): 2665. http://dx.doi.org/10.3390/polym14132665.

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This in vitro study aimed to examine the shear bond strength of composite on the dentin and enamel substrates when mixed with different composite-handling agents (CHAs). Eighty extracted molars were embedded into acrylic resin and sectioned sagittally. On the prepared specimens, four groups of resin mixtures were bonded onto the enamel or dentin surfaces—composite only, composite mixed with Composite Wetting Resin (CWR), composite mixed with Brush and Sculpt (BS), and composite mixed with Modeling Resin (MR). All groups were prepared by mixing at a 1:1 ratio by weight. Each specimen was subjected to the shear bond strength test. After the test, adhesive or cohesive failures were examined at the fractured sites. Data were analyzed using one-way and two-way analysis of variance (ANOVA) and the Tukey post hoc test. All composite groups mixed with CHAs displayed a reduced shear bond strength on dentin and enamel substrates compared to composite alone (p < 0.05). The shear bond strength on dentin decreased in the following order: CWR > BS > MR. A similar pattern was observed on enamel, except that there was no statistically significant difference between BS and MR. Statistically significant interactions between resin mixtures and substrates were found (p < 0.001). On the dentin substrate, adhesive failure dominated while adhesive/cohesive failure dominated on the enamel substrate. Conclusions: The shear bonding strength of composite decreases when mixed with CHAs on both dentin and enamel substrates.
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Cheng-an, Tao, Zhang Hao, Wang Fang, Zhu Hui, Zou Xiaorong y Wang Jianfang. "Mechanical Properties of Graphene Oxide/Polyvinyl Alcohol Composite Film". Polymers and Polymer Composites 25, n.º 1 (enero de 2017): 11–16. http://dx.doi.org/10.1177/096739111702500102.

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Graphene oxide (GO) was served as mechanical strengthening to prepare GO/Polyvinyl Alcohol(PVA) composite film. This was accomplished in order to explore the influence of contents of GO on the tensile strength and failure strain of GO/PVA composite film. The results showed that as the GO content increased, the tensile strength of the composite film became greater rapidly at first, and then decreased gradually. When the GO content was 20%, the film had its maximum tensile strength (59.6 MPa). This is over 500% of the tensile strength of pure PVA film. The failure strain of GO/PVA composite film decreased rapidly as the GO content increased. The enhancement mechanism of the composite can be explained by the existence of multi-hydrogen bonds between the hydroxyl (-OH) groups of PVA and oxygen-containing functional groups of GO.
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9

Drushlyak, M. y T. Lukashova. "Non-periodic groups with the restrictions on the norm of cyclic subgroups of non-prime order". Matematychni Studii 58, n.º 1 (31 de octubre de 2022): 36–44. http://dx.doi.org/10.30970/ms.58.1.36-44.

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One of the main directions in group theory is the study of the impact of characteristic subgroups on the structure of the whole group. Such characteristic subgroups include different $\Sigma$-norms of a group. A $\Sigma$-norm is the intersection of the normalizers of all subgroups of a system $\Sigma$. The authors study non-periodic groups with the restrictions on such a $\Sigma$-norm -- the norm $N_{G}(C_{\bar{p}})$ of cyclic subgroups of non-prime order, which is the intersection of the normalizers of all cyclic subgroups of composite or infinite order of $G$. It was proved that if $G$ is a mixed non-periodic group, then its norm $N_{G}(C_{\bar{p}})$ of cyclic subgroups of non-prime order is either Abelian (torsion or non-periodic) or non-periodic non-Abelian. Moreover, a non-periodic group $G$ has the non-Abelian norm $N_{G}(C_{\bar{p}})$of cyclic subgroups of non-prime order if and only if $G$ is non-Abelian and every cyclic subgroup of non-prime order of a group $G$ is normal in it, and $G=N_{G}(C_{\bar{p}})$.Additionally the relations between the norm $N_{G}(C_{\bar{p}})$ of cyclic subgroups of non-prime order and the norm $N_{G}(C_{\infty})$ of infinite cyclic subgroups, which is the intersection of the normalizers of all infinite cyclic subgroups, in non-periodic groups are studied. It was found that in a non-periodic group $G$ with the non-Abelian norm $N_{G}(C_{\infty})$ of infinite cyclic subgroups norms $N_{G}(C _{\infty})$ and $N_{G}(C _{\bar{p}})$ coincide if and only if $N_{G}(C _{\infty})$ contains all elements of composite order of a group $G$ and does not contain non-normal cyclic subgroups of order 4.In this case $N_{G}(C_{\bar {p}})=N_{G}(C_{\infty})=G$.
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Bonilla, ED, RG Stevenson, AA Caputo y SN White. "Microleakage Resistance of Minimally Invasive Class I Flowable Composite Restorations". Operative Dentistry 37, n.º 3 (1 de mayo de 2012): 290–98. http://dx.doi.org/10.2341/11-106-l.

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SUMMARY Minimally invasive flowable composite Class I restorations are widely used. However, flowable composites are characterized by low filler contents, modified resin formulations, low moduli of elasticity, low viscosity, generally poor mechanical properties, and decreased long-term stability. The purpose of this study was to compare the microleakage resistance of a wide variety of flowable composites used with their manufacturers' recommended bonding systems to that of a long-used and widely studied microhybrid composite when placed as minimally invasive occlusal restorations. Molar teeth were prepared in a standardized manner, restored, artificially aged, stained, sectioned, evaluated, and analyzed. Microleakage varied substantially, by a whole order of magnitude, among the material groups tested. The control group, a conventional microhybrid composite material, leaked significantly less than all the flowable composite groups. Microleakage varied very slightly among measurement site locations. Tiny microscopic bubbles were seen within many of the flowable composite specimens, as were a few voids.
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Tesis sobre el tema "Composite-order groups"

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Guillevic, Aurore. "Étude de l'arithmétique des couplages sur les courbes algébriques pour la cryptographie". Paris, Ecole normale supérieure, 2013. https://theses.hal.science/tel-00921940v1.

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Depuis 2000 les couplages sont devenus un très bon outil pour la conception de nouveaux protocoles cryptographiques. Les signatures courtes et le chiffrement basé sur l’identité sont devenus réalisables grâce aux couplages. Les travaux réalisés dans cette thèse comprennent deux aspects complémentaires. Une partie consiste en l’implémentation optimisée de couplages sur différentes courbes elliptiques, en fonction des protocoles visés. Une implémentation sur des courbes supersingulières en grande caractéristique et sur des courbes de Barreto-Naehrig est détaillée. La bibliothèque développée au Laboratoire Chiffre de Thales est utilisée avec des courbes de Barreto-Naehrig dans un protocole de diffusion chiffrée. La seconde application évalue la différence de temps de calcul pour des protocoles utilisant les couplages sur des courbes d’ordre composé (un large module RSA) et la traduction de ces protocoles qui utilise plusieurs couplages sur des courbes plus habituelles. Les résultats montrent une différence d’un facteur de 30 à 250 en fonction des étapes des protocoles, ce qui est très important. Une seconde partie porte sur deux familles de courbes de genre deux. Les jacobiennes de ces courbes sont isogènes au produit de deux courbes elliptiques sur une extension de corps de petit degré. Cette isogénie permet de transférer les propriétés des courbes elliptiques vers les jacobiennes. Le comptage de points est aisé et ne requiert qu’un comptage de points sur une des courbes elliptiques isogènes, plus quelques ajustements. On présente aussi la construction de deux endomorphismes à la fois sur les jacobiennes et sur les courbes elliptiques. Ces deux endomorphismes permettent des multiplications scalaires efficaces en suivant la méthode de Gallant, Lambert et Vanstone, ici en dimension quatre
Since 2000 pairings became a very useful tool to design new protocols in cryptography. Short signatures and identity-based encryption became also practical thanks to these pairings. This thesis contains two parts. One part is about optimized pairing implementation on different ellip- tic curves according to the targeted protocol. Pairings are implemented on supersingular elliptic curves in large characteristic and on Barreto-Naehrig curves. The pairing library developed at Thales is used in a broadcast encryption scheme prototype. The prototype implements pairings over Barreto-Naehrig curves. Pairings over supersingular curves are much slower and have larger parameters. However these curves are interesting when implementing protocols which use composite-order elliptic curves (the group order is an RSA modulus). We implement two protocols that use pairings on composite-order groups and compare the benchmarks and the parameter size with their counterpart in a prime-order setting. The composite-order case is 30 up to 250 times much slower according to the considered step in the protocols: the efficiency difference in between the two cases is very important. A second part in this thesis is about two families of genus 2 curves. Their Jacobians are isogenous to the product of two elliptic curves over a small extension field. The properties of elliptic curves can be translated to the Jacobians thanks to this isogeny. Point counting is as easy as for elliptic curves in this case. We also construct two endomorphisms both on the Jacobians and the elliptic curves. These en- domorphisms can be used for scalar multiplication improved with a four-dimensional Gallant-Lambert- Vanstone method
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2

Kim, Kwangmoo. "Topics in the theory of inhomogeneous media composite superconductors and dielectrics /". Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1180537980.

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Libros sobre el tema "Composite-order groups"

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Panigrahi, Muktikanta y Arpan Kumar Nayak. Polyaniline based Composite for Gas Sensors. IOR PRESS, 2021. http://dx.doi.org/10.34256/ioriip212.

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In this research work, we have demonstrated the synthesis, spectroscopic characteristics, thermal behaviour and DC conductivity of a few nanostructured composites, substituted conducting polymers (ICPs) and composites of ICPs. The physical properties of aforementioned composites are significantly changed by the doping with HCl, H2SO4, HNO3, H3PO4, or acrylic acid. The charge transport properties of these polymeric materials have been studied in detail because of their potential application in gas sensors. In the current work, varieties of conducting polymer based materials such as PANI-ES/Cloisite 20A nanostructured composite, acrylic acid (AA) doped PANI polymer, N-substituted conducting polyaniline polymer, DL−PLA/PANI-ES composites, poly methyl methacrylate (PMMA) based polyaniline composite, and inorganic acid doped polyaniline are sucessfuly synthesized using aniline/aniline hydrochloride as precursors in acidic medium. Particularly, AA based synthesised PANI polymer was found with higher solubility The spectroscopic, thermal stability, enthalpy of fusion, room temperature DC conductivity and temperature dependent DC conductivity measurements with and without magnetic was carried out with as-synthesized materials. The FTR/ATR−FTIR spectra indicated the presence of different functional groups in the as-prepared composite materials. The UV−Visible absorption spectroscopic analysis showed the presence of polaron band suggesting PANI-ES form. The Room temperature DC conductivity, temperature variation DC conductivity (in presence and absence of magnetic field), and magnetoresistance (MR) of as-prepared conducting polyaniline based were analysed. The highest room temperature DC conductivity value was obtained from H2SO4 doped based composite materials and all prepared conductive composites were followed ohms law. The low temperature DC conductivity was carried out in order to study the semiconducting nature of prepared materials. The Mott type VRH model was found to be well fitted the conductivity data and described the density of states at the Fermi level which is constant in this temperature range. From MR plots, a negative MR was observed, which described the quantum interference effect on hopping conduction. We discuss different gas analytes i.e., NO2, LPG, H2, NH3, CH4, and CO of conducting polymer based materials.
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Skaaning, Svend-Erik. The Global State of Democracy Indices Methodology, Conceptualization and Measurement Framework, Version 5 (2021). International Institute for Democracy and Electoral Assistance (International IDEA), 2021. http://dx.doi.org/10.31752/idea.2021.112.

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The Global State of Democracy is a biennial report that aims to provide policymakers with an evidence-based analysis of the state of global democracy, supported by the Global State of Democracy (GSoD) Indices, in order to inform policy interventions and identify problem-solving approaches to trends affecting the quality of democracy around the world. This document revises and updates the conceptual and measurement framework that guided the construction of Version 5 of the GSoD Indices, which depicts democratic trends at the country, regional and global levels across a broad range of different attributes of democracy in the period 1975–2020. The data underlying the GSoD Indices is based on a total of 116 indicators developed by various scholars and organizations using different types of source, including expert surveys, standards-based coding by research groups and analysts, observational data and composite measures.
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Tufis, Claudiu D. y Alexander Hudson. The Global State of Democracy Indices: Technical Procedures Guide, Version 7 (2023). 7a ed. International Institute for Democracy and Electoral Assistance (International IDEA), 2023. http://dx.doi.org/10.31752/idea.2023.39.

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The Global State of Democracy is a report that aims to provide policymakers with an evidence-based analysis of the state of global democracy, supported by the Global State of Democracy Indices (GSoD Indices), in order to inform policy interventions and identify problem-solving approaches to trends affecting the quality of democracy around the world. This document revises and updates the conceptual and measurement framework that guided the construction of Version 7 of the GSoD Indices, which depicts democratic trends at the country, regional and global levels across a broad range of different attributes of democracy in the period 1975–2022. The data underlying the GSoD Indices is based on a total of 157 indicators developed by various scholars and organizations using different approaches, including expert surveys, standards-based coding by research groups and analysts, observational data and composite measures.
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Tufis, Claudi D. y Alexander Hudson. The Global State of Democracy Indices Codebook, Version 5 (2021). International Institute for Democracy and Electoral Assistance (International IDEA), 2021. http://dx.doi.org/10.31752/idea.2021.111.

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The Global State of Democracy is a biennial report that aims to provide policymakers with an evidence-based analysis of the state of global democracy, supported by the Global State of Democracy Indices (GSoD Indices), in order to inform policy interventions and identify problem-solving approaches to trends affecting the quality of democracy around the world. This document presents revised and updated information about all the variables included in the GSoD indices data set that enabled the construction of Version 5 of the GSoD Indices, which depicts democratic trends at the country, regional and global levels across a broad range of different attributes of democracy in the period 1975–2020. The data underlying the GSoD Indices is based on a total of 116 indicators developed by various scholars and organizations using different types of source, including expert surveys, standards-based coding by research groups and analysts, observational data and composite measures.
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Tufis, Claudiu D. The Global State of Democracy Indices Codebook, Version 4 (2020). International Institute for Democracy and Electoral Assitance, 2020. http://dx.doi.org/10.31752/idea.2020.71.

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The Global State of Democracy is a biennial report that aims to provide policymakers with an evidence-based analysis of the state of global democracy, supported by the Global State of Democracy Indices (GSoD Indices), in order to inform policy interventions and identify problem-solving approaches to trends affecting the quality of democracy around the world. The second edition of the report provides a health check of democracy and an overview of the current global and regional democracy landscape. This document presents revised and updated information about all the variables included in the GSoD indices data set that enabled the construction of Version 4 of the GSoD Indices, which depicts democratic trends at the country, regional and global levels across a broad range of different attributes of democracy in the period 1975–2019. The data underlying the GSoD Indices is based on a total of 116 indicators developed by various scholars and organizations using different types of source, including expert surveys, standards-based coding by research groups and analysts, observational data and composite measures.
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Skaaning, Svend-Erik. The Global State of Democracy Indices Methodology: Conceptualization and Measurement Framework, Version 4 (2020). International Institute for Democracy and Electoral Assistance, 2020. http://dx.doi.org/10.31752/idea.2020.72.

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The Global State of Democracy is a biennial report that aims to provide policymakers with an evidence-based analysis of the state of global democracy, supported by the Global State of Democracy Indices (GSoD Indices), in order to inform policy interventions and identify problem-solving approaches to trends affecting the quality of democracy around the world. The second edition of the report provides a health check of democracy and an overview of the current global and regional democracy landscape. This document presents revised and updated information about all the variables included in the GSoD indices data set that enabled the construction of Version 4 of the GSoD Indices, which depicts democratic trends at the country, regional and global levels across a broad range of different attributes of democracy in the period 1975–2019. The data underlying the GSoD Indices is based on a total of 116 indicators developed by various scholars and organizations using different types of source, including expert surveys, standards-based coding by research groups and analysts, observational data and composite measures.
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Tufis, Claudiu D. The Global State of Democracy Indices Technical Procedures Guides, Version 4 (2020). International Institute for Democracy and Electoral Assistance, 2020. http://dx.doi.org/10.31752/idea.2020.56.

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The Global State of Democracy is a biennial report that aims to provide policymakers with an evidence-based analysis of the state of global democracy, supported by the Global State of Democracy Indices (GSoD Indices), in order to inform policy interventions and identify problem-solving approaches to trends affecting the quality of democracy around the world. The second edition of the report provides a health check of democracy and an overview of the current global and regional democracy landscape. This document presents revised and updated information about all the variables included in the GSoD indices data set that enabled the construction of Version 4 of the GSoD Indices, which depicts democratic trends at the country, regional and global levels across a broad range of different attributes of democracy in the period 1975–2019. The data underlying the GSoD Indices is based on a total of 116 indicators developed by various scholars and organizations using different types of source, including expert surveys, standards-based coding by research groups and analysts, observational data and composite measures.
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Tufis, Claudio D. y Alexander Hudson. The Global State of Democracy Indices Technical Procedures Guides, Version 5 (2021). International Institute for Democracy and Electoral Assistance (International IDEA), 2021. http://dx.doi.org/10.31752/idea.2021.110.

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The Global State of Democracy is a biennial report that aims to provide policymakers with an evidence-based analysis of the state of global democracy, supported by the Global State of Democracy (GSoD) Indices, in order to inform policy interventions and identify problem-solving approaches to trends affecting the quality of democracy around the world. The third edition of the report provides analyses of the current trends in democracy and human rights at the national, regional, and global levels, with special attention to the effects of the Covid-19 pandemic. This document presents revised and updated information about all the variables included in the GSoD indices data set that enabled the construction of Version 5 of the GSoD Indices, which depicts democratic trends at the country, regional and global levels across a broad range of different attributes of democracy in the period 1975–2020. The data underlying the GSoD Indices is based on a total of 116 indicators developed by various scholars and organizations using different types of source, including expert surveys, standards-based coding by research groups and analysts, observational data and composite measures.
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Croasmun, Matthew. The Emergence of Persons Great and Small. Oxford University Press, 2017. http://dx.doi.org/10.1093/acprof:oso/9780190277987.003.0004.

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This chapter turns specifically to the question of personhood, offering an emergent ontology of human persons at both the biological and psychological levels. These “individuals” prove to be internally composite and externally open to further combination. The discussion then moves to consider these “external” combinations. In somatic terms, this involves discussion of biology’s history of determining the biological “individual,” and the discussion of “superorganisms” that blur the distinction between parts and wholes. Various theories of “group mind” are evaluated in order to consider the relevance of the presence of group cognition in identifying the emergence of “persons” at higher levels of complexity. The hypothesis is presented that Sin should be understood as a mythological person—a superorganism with a group mind—supervening on the transgressions of individual human persons and sinful social systems.
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Janssen, Ted, Gervais Chapuis y Marc de Boissieu. Introduction. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198824442.003.0001.

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First a general description of the concept of crystalline structures is presented with some historical background information. The classical approach of periodic structures is presented along with the important topic of symmetry and its role characterizing physical properties. The limitations of the classical model are then introduced in view of the new experimental observations discovered since the 1970s. New forms of crystalline structures including incommensurately modulated and composite structures are presented along with quasicrystalline structures (quasicrystals). The necessity to extend the theory of space group symmetry is then discussed and the concept of superspace symmetry is introduced in order to describe these new forms of matters.
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Capítulos de libros sobre el tema "Composite-order groups"

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Freeman, David Mandell. "Converting Pairing-Based Cryptosystems from Composite-Order Groups to Prime-Order Groups". En Advances in Cryptology – EUROCRYPT 2010, 44–61. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13190-5_3.

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Chen, Peixin, Xiaofeng Wang y Jinshu Su. "A Hierarchical Identity-Based Signature from Composite Order Bilinear Groups". En Algorithms and Architectures for Parallel Processing, 46–56. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-27161-3_5.

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Lewko, Allison. "Tools for Simulating Features of Composite Order Bilinear Groups in the Prime Order Setting". En Advances in Cryptology – EUROCRYPT 2012, 318–35. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29011-4_20.

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Lee, Kwangsu. "Transforming Hidden Vector Encryption Schemes from Composite to Prime Order Groups". En Information Security and Cryptology – ICISC 2016, 101–25. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-53177-9_5.

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Lewko, Allison y Sarah Meiklejohn. "A Profitable Sub-prime Loan: Obtaining the Advantages of Composite Order in Prime-Order Bilinear Groups". En Lecture Notes in Computer Science, 377–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-46447-2_17.

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Meiklejohn, Sarah, Hovav Shacham y David Mandell Freeman. "Limitations on Transformations from Composite-Order to Prime-Order Groups: The Case of Round-Optimal Blind Signatures". En Advances in Cryptology - ASIACRYPT 2010, 519–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-17373-8_30.

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Wei, Chang Jia, Ong Zhen Liang y Ehsan Nikbakht Jarghouyeh. "Experimental Investigation of Effectiveness of FRP Composite Repair System on Offshore Pipelines Subjected to Pitting Corrosion Under Axial Compressive Load". En Lecture Notes in Civil Engineering, 209–18. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1748-8_17.

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AbstractThe application of FRP composite is quite well demonstrated in strengthening on RC structures but on strengthening of steel structures is still being investigated by many researchers. The aggressive marine environment can cause corrosion to the offshore pipelines which would affect the structural performance such as pitting corrosion which could be considered as the most destructive corrosion was simulated in this research. This study had attempted to carry out experimental investigation of effectiveness of FRP composite repair system on offshore pipelines subjected to pitting corrosion under axial compressive load. 3 groups of specimens have been categorized such as intact, corroded and repaired. Results such as compressive peak load, failure modes and load–displacement behavior were concerned in this study. The pitting corrosion has been investigated and proved that it has significant effect on the ultimate strength of pipelines. Number of CFRP layer such as 3 layers has been investigated which the results showed the FRP composite repair system capable of strengthening of corroded offshore pipelines. However, more detailed studies are required to be conducted in the future such as consideration of internal pressure in order to expand the understanding of this composite repair system.
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Deng, Liwen, Jianting Pan, Haolin Ye, Jinming Zeng, Hao Lu y Hong Pan. "Study on Ground Deformation Law of Small Spacing Shield Tunneling in Sand and Rock Composite Stratum". En Lecture Notes in Civil Engineering, 239–52. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2532-2_20.

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AbstractThe construction of shield tunnel often occurs in composite stratum, so it is of great significance to study the law of surface deformation under the working condition of composite stratum in order to ensure the safety of shield construction. Based on the actual tunnel engineering, the law of ground surface soil deformation caused by shield construction in the composite stratum of upper sand and lower rock is studied by using the method of field measurement. The results show that: The width coefficient of the surface settlement trough basically remains stable with the shield construction, and the stratum loss rate changes exponentially with the shield construction; Affected by the disturbance of the previous shield construction, the surface settlement trough caused by the subsequent shield construction is no longer on the top of the tunnel axis, and will move with the construction process, which is greatly affected by the shield attitude parameters; Taking into account the conditions of the center movement of the settlement trough of the subsequent tunnel, the total surface settlement caused by the successive shield constructions adopts the modified Mark-bolt formula to make the fitting parameters of the settlement trough more suitable for reality.
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Wan, Shengwu y Xueyuan Cheng. "Finite Element Analysis of Steel Tube Bundle Composite Shear Wall with Different Constructions". En Lecture Notes in Civil Engineering, 295–302. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1748-8_25.

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AbstractIn order to study the seismic performance of the steel tube bundle composite shear wall with different constructions. Based on the failure tests of three composite shear wall specimens without steel tube bundle end, with studs and stiffener, a feasible numerical model is established by ABAQUS. The hysteresis curve and energy dissipation coefficient, skeleton curve and ductility of the shear wall were further analyses by varying the axial compression ratio and the spacing of the internal diaphragm. The results show that the stud group and the stiffener group can effectively improve the horizontal bearing capacity, energy dissipation capacity, bearing capacity and ductility of the shear wall. Under the condition of low axial compression ratio, the horizontal bearing capacity of the member with stud is increased by 6.3%; Under the condition of high axial compression ratio, the horizontal bearing capacity of members with stiffeners is increased by 4.5%; The change of axial compression ratio and the spacing between inner diaphragms of shear walls with stiffeners has little effect on their energy dissipation capacity and ductility.
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Muthuvalu, Mohana Sundaram, Elayaraja Aruchunan y Jumat Sulaiman. "Performance Analysis of 2-Point Explicit Group (2-EG) Method for Solving Second-Order Composite Closed Newton-Cotes Quadrature System". En Regional Conference on Science, Technology and Social Sciences (RCSTSS 2014), 297–305. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0534-3_28.

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Actas de conferencias sobre el tema "Composite-order groups"

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Liu, Weiran, Xiao Liu, Qianhong Wu y Bo Qin. "Experimental performance comparisons between (H)IBE schemes over composite-order and prime-order bilinear groups". En 2014 11th International Bhurban Conference on Applied Sciences and Technology (IBCAST). IEEE, 2014. http://dx.doi.org/10.1109/ibcast.2014.6778146.

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Chen, Peixin, Xiaofeng Wang, Baokang Zhao, Hao Sun, Jinshu Su y Ilsun You. "An Escrow-Free Hierarchical Identity-Based Signature Scheme from Composite Order Bilinear Groups". En 2015 10th International Conference on Broadband and Wireless Computing, Communication and Applications (BWCCA). IEEE, 2015. http://dx.doi.org/10.1109/bwcca.2015.9.

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Cao, Zhengjun, Xiangjia Wu y Hanyue Cao. "Modification of One Forward Secure Ring Signature Scheme Based on Bilinear Groups of Composite Order". En 2013 International Conference on Cloud and Service Computing (CSC). IEEE, 2013. http://dx.doi.org/10.1109/csc.2013.27.

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Ricard, D., F. Hache, P. Roussignol y C. Flytzanis. "Optical Nonlinearities of Composite Materials". En Nonlinear Optical Properties of Materials. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/nlopm.1988.tud4.

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The implementation of promising applications of nonlinear optics in the optoelectronics field depends on the availability of nonlinear materials possessing a large and fast nonlinear response. Research in this domain was for many years concentrated on homogeneous media, both inorganic and organic. Recently however, a few groups have studied the new properties originating from heterogeneous composite materials. Two processes may make them very attractive : local field correction and carrier confinement. We have, for example, investigated the nonlinear properties of metal colloïds (gold and silver) , whose linear properties had been extensively studied previously. Near the surface plasma resonance, their nonlinear response shows a dramatic enhancement. It is very fast (subpicosecond) and for volume fractions as small as a few 10−6 their Kerr susceptibility is of the same order of magnitude as that of CS2. This also allowed us to measure for the first time the Kerr susceptibility of these metals.
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Mao, Cong, Hongji Sang, Jiawei Zheng y Yan Wu. "Study on Synthesis of the Organophosphorus Functionalized MCM-41 And its Adsorption Property for Dy(III)". En 2022 29th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/icone29-93196.

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Abstract The composite of organophosphorus groups loaded on MCM-41(MCM-Zr-TBP) was prepared by multi-steps impregnation method to develop a novel adsorbent for radioactive lanthanides extraction from the secondary contaminated water. The synthesized hybrid material was characterized by SEM and TG. Dy(III) was taken as the representative of trivalent lanthanides. The adsorption performance of Dy(III) on MCM-Zr-TBP composite was systematically studied as the functions of solution pH, initial concentration, interaction time and aqueous temperature. The results showed that Dy(III) adsorption on MCM-Zr-TBP composite was highly dependent on aqueous pH and initial metal ion concentration. Compared with the Freundlich and pseudo-first order models, the Langmuir and pseudo-second order models presented better fitting for the adsorption data. These results indicated that MCM-Zr-TBP was found to be an effective and competent adsorbent, which could be used for the effective removal of lanthanides from the wastewater.
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Mahapatra, D. Roy, S. Gopalakrishnan y T. S. Sankar. "Scattering and Transmission of Mixed-Mode Waves in Delaminated Thick Composite Beams". En ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/vib-21543.

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Abstract A spectral finite element model is developed to study scattering and transmission of axial-flexural-torsional coupled waves in multi-sitedelaminated thick composite beams. The analysis may find its suitability and superiority to capture the high frequency dynamics of laminated composite structure in vibrating environment and for health monitoring in combination with non-destructive test data. Spectral finite element considering first order shear deformation is used to model the delaminated segments along the span of the beam, as well as the delaminated ply-groups in thickness direction. This spectral element is derived from exact solution to the 3D governing wave equations in Fourier domain. As aresult, the thin sublaminates and beam segments do not lock. Spatial discretization is carried out in a similar way as in conventional finite element method. The major differences from conventional finite element method are (1) the transformation of all the fields from temporal to frequency domain is carried out using Fast Fourier Transform (FFT) algorithm, (2) the global system is solved at each frequency step (3) fine meshing at the delamination tip to capture the crack-tip singularity (as in conventional finite element discretization) is not required (4) the overall system size becomes many order smaller than that in conventional finite element methods. The study essentially includes unsymmetry induced due to ply orientations and due to multiple delamination across beam thickness. A case study is presented to show the effect of wave transmission and scattering by a single through delamination in unidirectional composite beam.
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Bailey-Van Kuren, Michael, Carter Hamilton y Eduardo Rivera. "A Design Based Materials Study for a Wearable Muscle Stretching Device Aimed at Patients With Spasticity". En ASME 2007 2nd Frontiers in Biomedical Devices Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/biomed2007-38067.

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The efficacy of robotic systems in rehabilitation is well established. Many of these systems are fixed equipment that requires the user to visit a facility for treatment. Furthermore, current treatment options for pediatric patients with spastic dyplagia include manual stretching of the muscle groups and serial casting in conjunction with Botox injections. The goal of this work is to develop a dynamic orthotic to stretch the muscles of the lower calf. A subsystem of this project is the development of wearable sensor system to detect spasticity and control the system actuators. A system of thin film sensors embedded into a novel composite structure is proposed. In order to develop a dynamic orthotic to stretch the muscles of the lower calf, a subsystem of this project is the development of wearable sensor system embedded into a novel composite structure [1, 2, 3].
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Yang, Fuzheng y Ranga Pitchumani. "Modeling of Interphase Formation on Unsized Fibers in Thermosetting Composites". En ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1491.

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Abstract The interphase is the region between the fiber and matrix whose properties strongly influence the overall composite behavior in terms of mechanical strength, chemical and thermal durability. The composition and thickness of the interphase region is governed by the processing conditions, in addition to the fiber surface treatments and other characteristics of the fiber and the resin materials. One of the strong contributing mechanisms to interphase formation is the preferential adsorption of matrix components onto the fiber surface, which takes place on the order of molecular scales. Chemical reaction in the matrix also happens simultaneously with the adsorption process. In this paper, a multi-layer adsorption-desorption-reaction model for a binary fluid mixture in contact with a solid surface is implemented to study the kinetics of interphase formation near bare fiber surfaces in thermosetting composite systems. Composition and thickness evolution of the interphase are predicted as functions of time. Conditions that lead to interphase formation upon vitrification are identified. Parametric studies are presented to investigate the effects of various nondimensional groups on the interphase region development.
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Ho, Son H., Muhammad M. Rahman y Aydin K. Sunol. "Prediction of Temperature Distribution in a Food Self-Heating System". En 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-23394.

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This paper presents a numerical modeling and simulation of heat transfer in a food self-heating unit for group meals. A model of a water-activated heater based on an exothermic reaction was developed. The resulting governing equations of heat conduction and chemical reaction were solved for an analytical approximate solution, to which experimental data found from literature were compared and curve fitted. Then a model of a complete food-heating unit, which includes a stack of four sets of food tray, heating tray, and heater sandwiched between them, as well as the cardboard container, was developed. A system of governing equations for heat transfer in the composite medium for the complete model was solved. Numerical solution of temperature distribution within the food-heating unit is presented. The responses in thermal performance of the heating system to the parameters that influence heating profiles of the heater such as decay constant and heat generation were studied in order to improve the thermal performance of the heating system. The results are useful for designing and optimizing self-heating systems for food served to groups of many people.
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Nowak, Michael D. "Combined Mechanical Engineering Materials Lecture and Mechanics of Materials Laboratory: Cross-Disciplinary Teaching". En ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82008.

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We have developed a course combining a Mechanical Engineering Materials Laboratory with a Materials Science lecture for a small combined population of undergraduate Mechanical and Biomedical Engineering students. By judicious selection of topic order, we have been able to utilize one lecture and one laboratory for both Mechanical and Biomedical Engineering students (with limited splitting of groups). The primary reasons for combining the Mechanical and Biomedical students are to reduce faculty load and required resources in a small university. For schools with medium or small Mechanical and Biomedical Engineering programs, class sizes could be improved if they could include other populations. The heterogeneous populations also aid in teaching students that the same engineering techniques are useful in more than a single engineering realm. The laboratory sections begin with the issues common to designing and evaluating mechanical testing, followed by tensile, shear, and torsion evaluation of metals. To introduce composite materials, wood and cement are evaluated. While the Mechanical Engineering students are evaluating impact and strain gauges, the Biomedical Engineering students are performing tensile studies of soft tissues, and compression of long bones. The basic materials lectures (beginning at the atomic level) are in common with both Mechanical and Biomedical student populations, until specific topics such as human body materials are discussed. Three quarters of the term is thus taught on a joint basis, and three or four lectures are split. Basic metal, plastic and wood behavior is common to both groups.
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Informes sobre el tema "Composite-order groups"

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Alexander, Chris. PR652-184505-R01 Evaluating Installation Techniques for Pipeline Repair Methods. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), febrero de 2021. http://dx.doi.org/10.55274/r0012029.

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A testing program was conducted to evaluate the effects of internal pressure during the installation of composite and steel sleeves repair systems on pipelines with plain dents. The testing program included cyclic pressure testing a group of 12.75-inch OD x 0.188-inch WT, Grade X42 pipe samples with plain dents having residual dent depths on the order of 3% to 4% of the pipe's outside diameter. The dent samples were repaired using four (4) different composite repair systems, type-A steel sleeves, and steel thermal compression sleeves. The composite repair systems included a carbon fiber wet-layup, an E-glass wet-layup, a system with precured plies, and a hybrid composite-steel repair system. To determine the effect internal pressure has on repair installation for dents, all repairs were installed with an internal pressure of 64% SMYS (793 psig) in the pipe sample. The dent samples were then pressure cycled between 8 - 80% SMSY ( and Delta;P = 900 psig) until failure or reaching the runout condition of 250,000 cycles. Only three (3) out of the fourteen (14) repaired dents reached the 250,000 pressure cycle runout condition and these samples were all repaired using steel sleeves. The maximum number of cycles reached by any composite repair was approximately 200,000 cycles while the least number of cycles reached was approximately 24,000 cycles. In addition to the dent repairs, two (2) 12.75-inch OD x 0.375-inch WT, Grade X42 pipe samples with a 6-inch x 8-inch corrosion defect were repaired with an E-glass wet-layup. These two (2) samples were a continuation of a previous study that investigated the effects of a 50% SMYS (1,235 psig) installation pressure on the fatigue performance of corrosion repairs. Both samples reached the runout condition of 250,000 cycles. The body of work is seminal in that it is the first time that industry was evaluated a wide range of repair technologies to determine the effects of pressure during installation in reinforcing plain dents. It has been speculated for some time that internal pressure present during installation of composite repair technologies has an impact on fatigue performance. Although corrosion features do not appear to be a concern, the reinforcement of dents with internal pressure requires careful consideration. Because gas transmission pipelines do not experience aggressive pressure cycling, the effects of pressure present during installation are not a major concern. However, liquid transmission pipeline operators should be cognizant of the pressure effects and respond accordingly. Namely, pressure should be reduced during installation as much as possible.
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Russo, David, Daniel M. Tartakovsky y Shlomo P. Neuman. Development of Predictive Tools for Contaminant Transport through Variably-Saturated Heterogeneous Composite Porous Formations. United States Department of Agriculture, diciembre de 2012. http://dx.doi.org/10.32747/2012.7592658.bard.

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The vadose (unsaturated) zone forms a major hydrologic link between the ground surface and underlying aquifers. To understand properly its role in protecting groundwater from near surface sources of contamination, one must be able to analyze quantitatively water flow and contaminant transport in variably saturated subsurface environments that are highly heterogeneous, often consisting of multiple geologic units and/or high and/or low permeability inclusions. The specific objectives of this research were: (i) to develop efficient and accurate tools for probabilistic delineation of dominant geologic features comprising the vadose zone; (ii) to develop a complementary set of data analysis tools for discerning the fractal properties of hydraulic and transport parameters of highly heterogeneous vadose zone; (iii) to develop and test the associated computational methods for probabilistic analysis of flow and transport in highly heterogeneous subsurface environments; and (iv) to apply the computational framework to design an “optimal” observation network for monitoring and forecasting the fate and migration of contaminant plumes originating from agricultural activities. During the course of the project, we modified the third objective to include additional computational method, based on the notion that the heterogeneous formation can be considered as a mixture of populations of differing spatial structures. Regarding uncertainly analysis, going beyond approaches based on mean and variance of system states, we succeeded to develop probability density function (PDF) solutions enabling one to evaluate probabilities of rare events, required for probabilistic risk assessment. In addition, we developed reduced complexity models for the probabilistic forecasting of infiltration rates in heterogeneous soils during surface runoff and/or flooding events Regarding flow and transport in variably saturated, spatially heterogeneous formations associated with fine- and coarse-textured embedded soils (FTES- and CTES-formations, respectively).We succeeded to develop first-order and numerical frameworks for flow and transport in three-dimensional (3-D), variably saturated, bimodal, heterogeneous formations, with single and dual porosity, respectively. Regarding the sampling problem defined as, how many sampling points are needed, and where to locate them spatially in the horizontal x₂x₃ plane of the field. Based on our computational framework, we succeeded to develop and demonstrate a methdology that might improve considerably our ability to describe quntitaively the response of complicated 3-D flow systems. The results of the project are of theoretical and practical importance; they provided a rigorous framework to modeling water flow and solute transport in a realistic, highly heterogeneous, composite flow system with uncertain properties under-specified by data. Specifically, they: (i) enhanced fundamental understanding of the basic mechanisms of field-scale flow and transport in near-surface geological formations under realistic flow scenarios, (ii) provided a means to assess the ability of existing flow and transport models to handle realistic flow conditions, and (iii) provided a means to assess quantitatively the threats posed to groundwater by contamination from agricultural sources.
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