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See detailQuantum-chemical insights from deep tensor neural networks
Schütt, Kristof T.; Arbabzadah, Farhad; Chmiela, Stefan et al

in Nature Communications (2017), 8

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See detailQuantum-dot Carnot engine at maximum power
Esposito, Massimiliano UL; Kawai, Ryoichi; Lindenberg, Katja et al

in Physical Review E (2010), 81(4),

We evaluate the efficiency at maximum power of a quantum-dot Carnot heat engine. The universal values of the coefficients at the linear and quadratic order in the temperature gradient are reproduced ... [more ▼]

We evaluate the efficiency at maximum power of a quantum-dot Carnot heat engine. The universal values of the coefficients at the linear and quadratic order in the temperature gradient are reproduced. Curzon-Ahlborn efficiency is recovered in the limit of weak dissipation. [less ▲]

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See detailLes quartiers de la Ville de Luxembourg - Luxemburg-Stadt: Die Stadtteile
Heinz, Andreas UL; Peltier, François; Thill, Germaine et al

E-print/Working paper (2013)

Les habitants de la capitale (95 058 au 1er février 2011) se répartissent sur 24 quartiers. Le quartier de Bonnevoie-Sud est le plus peuplé (11 279 habitants), alors que Pulvermühle ne compte que 333 ... [more ▼]

Les habitants de la capitale (95 058 au 1er février 2011) se répartissent sur 24 quartiers. Le quartier de Bonnevoie-Sud est le plus peuplé (11 279 habitants), alors que Pulvermühle ne compte que 333 habitants. Entre 2001 et 2011, c’est le quartier du Cents qui a connu la croissance démographique la plus importante (+72.2%), tandis que les quartiers de Pfaffenthal (-8.7%) et de Clausen (-10.8%) ont perdu des habitants. Dans l’ensemble des quartiers de la capitale, la part des étrangers a augmenté. C’est dans le quartier de la Gare que la part des étrangers est la plus élevée (81.6% en 2011). Au Cents elle est la plus faible avec 42.4%. Dans le quartier de la Gare, la surface moyenne des logements est la plus restreinte (69.5 m²), alors qu’elle atteint plus du double à Cessange (130.0 m²). Les habitants du Grund et du quartier de la Gare vivent très majoritairement en location (respectivement 71.5% et 74.7% de la population). En revanche, au Cents, la part des locataires n’est que de 19.4%. En termes absolus, les loyers sont les plus élevés au Cents (1 285€ en moyenne par logement sans charges) et les moins élevés à Pfaffenthal (756€). Cependant, l’augmentation du prix des loyers de 2001 à 2011 est particulièrement importante au Pfaffenthal (+94.9%), alors qu’au Cents le loyer moyen n’a augmenté que de 28.7%. La surface des logements loués varie fortement entre les quartiers. Rapportés à la surface, les loyers sont les plus élevés dans le quartier de la Gare (17.08€ par m²), à Clausen (16.33€ par m²) et dans le quartier de Neudorf (16.27€ par m²). Ils sont les plus faibles à Pfaffenthal (11.41€ par m²) et à Hamm (11.79€ par m2). Dans la « Ville Haute Centre » et dans le quartier de la Gare, la part des personnes vivant seules est la plus élevée (43%). À Hamm, la part des couples avec enfant(s) parmi les ménages est la plus élevée (51.9%). En ce qui concerne le niveau d’éducation, c’est au Pfaffenthal que la part des personnes ayant un niveau d’éducation faible est la plus importante (53.0%), alors qu’au Limpertsberg le taux correspondant n’est que de 11.7%. Par contre, 67.5% des habitants du Limpertsberg ont atteint un niveau d’éducation élevé. [less ▲]

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See detailQuasi Fermi level splitting of Cu-rich and Cu-poor Cu(In,Ga)Se2 absorber layers
Babbe, Finn UL; Choubrac, Léo UL; Siebentritt, Susanne UL

in Applied Physics Letters (2016), 109

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See detailQuasi-dynamic traffic assignment with spatial queueing, control and blocking back
Smith, Mike; Huang, Wei; Viti, Francesco UL et al

in Transportation Research. Part B, Methodological (2019)

This paper introduces a steady-state, fixed (or inelastic) demand equilibrium model with explicit link-exit capacities, explicit bottleneck or queueing delays and explicit bounds on queue storage ... [more ▼]

This paper introduces a steady-state, fixed (or inelastic) demand equilibrium model with explicit link-exit capacities, explicit bottleneck or queueing delays and explicit bounds on queue storage capacities. The model is a quasi-dynamic model. The link model at the heart of this quasi-dynamic equilibrium model is a spatial queueing model, which takes account of the space taken up by queues both when there is no blocking back and also when there is blocking back. The paper shows that if this quasi-dynamic model is utilised then for any feasible demand there is an equilibrium solution, provided (i) queue storage capacities are large or (ii) prices are used to help impose capacity restrictions; the prices either remove queueing delays entirely or just reduce spatial queues sufficiently to ensure that blocking back does not occur at equilibrium. Similar results, but now involving the P0 control policy (introduced in Smith (1979a, 1987)) and two new variations of this policy (i.e., the spatial P0 control policy, and the biased spatial P0 control policy) are obtained. In these results, the control policies allow green-times to vary in response to prices as well as spatial queueing delays. These three policies are also tested on a small simple network. In these tests, the biased spatial version of P0 is much the best in reducing equilibrium delays (on this simple network). The paper further illustrates how the spatial queueing model works on simple networks with different merge models; it is demonstrated that equilibrium may be prevented by certain (fixed ratio) merge models. It is also shown in this case that equilibrium may be imposed on just the controlled area itself by a variety of (merge model, gating strategy) combinations. Opportunities for developing such combined gating and merging control strategies are finally discussed. [less ▲]

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See detailQuasi-extensions de Lovász et leur version symétrique
Couceiro, Miguel; Marichal, Jean-Luc UL

in Rencontres francophones sur la logique floue et ses applications 2012 (2012, November 15)

We present a study of the class of quasi-Lovász extensions (i.e. functions which are a composition of a Lovász extension with a nondecreasing function vanishing at the origin) as well as that of their ... [more ▼]

We present a study of the class of quasi-Lovász extensions (i.e. functions which are a composition of a Lovász extension with a nondecreasing function vanishing at the origin) as well as that of their symmetric variants. These functions appear naturally within the scope of decision making under uncertainty since they subsume overall preference functionals associated with discrete Choquet integrals and symmetric discrete Choquet integrals, respectively, whose variables are transformed by a given utility function. [less ▲]

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See detailQuasi-Fermi-Level Splitting of Cu-Poor and Cu-Rich CuInS2 Absorber Layers
Lomuscio, Alberto UL; Rödel, Tobias UL; Schwarz, Torsten et al

in Physical Review Applied (2019), 11

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See detailQuasi-Fuchsian manifolds with particles
Moroianu, Sergiu; Schlenker, Jean-Marc UL

in Journal of Differential Geometry (2009), 83(1), 75-129

We consider 3-dimensional hyperbolic cone-manifolds, singular along infinite lines, which are ``convex co-compact'' in a natural sense. We prove an infinitesimal rigidity statement when the angle around ... [more ▼]

We consider 3-dimensional hyperbolic cone-manifolds, singular along infinite lines, which are ``convex co-compact'' in a natural sense. We prove an infinitesimal rigidity statement when the angle around the singular lines is less than $\pi$: any first-order deformation changes either one of those angles or the conformal structure at infinity, with marked points corresponding to the endpoints of the singular lines. Moreover, any small variation of the conformal structure at infinity and of the singular angles can be achieved by a unique small deformation of the cone-manifold structure. [less ▲]

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See detailQuasi-Lovász extensions and their symmetric counterparts
Couceiro, Miguel UL; Marichal, Jean-Luc UL

in Greco, S.; Bouchon-Meunier, B.; Coletti, G. (Eds.) et al Advances on Computational Intelligence, Part IV, 14th Int. Conf. on Information Processing and Management of Uncertainty in Knowledge-Based Systems, IPMU 2012, Catania, Italy, July 9-13, 2012, Proceedings, Part IV (2012)

We introduce the concept of quasi-Lov\'asz extension as being a mapping $f\colon I^n\to\R$ defined over a nonempty real interval $I$ containing the origin, and which can be factorized as $f(x_1,\ldots,x_n ... [more ▼]

We introduce the concept of quasi-Lov\'asz extension as being a mapping $f\colon I^n\to\R$ defined over a nonempty real interval $I$ containing the origin, and which can be factorized as $f(x_1,\ldots,x_n)=L(\varphi(x_1),\ldots,\varphi(x_n))$, where $L$ is the Lov\'asz extension of a pseudo-Boolean function $\psi\colon\{0,1\}^n\to\R$ (i.e., the function $L\colon\R^n\to\R$ whose restriction to each simplex of the standard triangulation of $[0,1]^n$ is the unique affine function which agrees with $\psi$ at the vertices of this simplex) and $\varphi\colon I\to\R$ is a nondecreasing function vanishing at the origin. These functions appear naturally within the scope of decision making under uncertainty since they subsume overall preference functionals associated with discrete Choquet integrals whose variables are transformed by a given utility function. To axiomatize the class of quasi-Lov\'asz extensions, we propose generalizations of properties used to characterize the Lov\'asz extensions, including a comonotonic version of modularity and a natural relaxation of homogeneity. A variant of the latter property enables us to axiomatize also the class of symmetric quasi-Lov\'asz extensions, which are compositions of symmetric Lov\'asz extensions with $1$-place nondecreasing odd functions. [less ▲]

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See detailQuasi-Lovász extensions on bounded chains
Couceiro, Miguel; Marichal, Jean-Luc UL

in Laurent, Anne; Strauss, Olivier; Bouchon-Meunier, Bernadette (Eds.) et al 15th International Conference on Information Processing and Management of Uncertainty in Knowledge-Based Systems, IPMU 2014, Montpellier, France, July 15-19, 2014. Proceedings, Part I (2014, July 22)

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See detailQuasi-Open Bisimilarity with Mismatch is Intuitionistic
Horne, Ross James UL; Ahn, Ki Yung; Lin, Shang-wei et al

in Proceedings of LICS '18: 33rd Annual ACM/IEEE Symposium on Logic in Computer Science, Oxford, United Kingdom, July 9-12, 2018 (LICS '18) (2018)

Quasi-open bisimilarity is the coarsest notion of bisimilarity for the π-calculus that is also a congruence. This work extends quasi-open bisimilarity to handle mismatch (guards with inequalities). This ... [more ▼]

Quasi-open bisimilarity is the coarsest notion of bisimilarity for the π-calculus that is also a congruence. This work extends quasi-open bisimilarity to handle mismatch (guards with inequalities). This minimal extension of quasi-open bisimilarity allows fresh names to be manufactured to provide constructive evidence that an inequality holds. The extension of quasi-open bisimilarity is canonical and robust --- coinciding with open barbed bisimilarity (an objective notion of bisimilarity congruence) and characterised by an intuitionistic variant of an established modal logic. The more famous open bisimilarity is also considered, for which the coarsest extension for handling mismatch is identified. Applications to checking privacy properties are highlighted. Examples and soundness results are mechanised using the proof assistant Abella. [less ▲]

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See detailQuasi-polynomial functions on bounded chains
Couceiro, Miguel UL; Marichal, Jean-Luc UL

in Carvalho, J. P.; Dubois, D.; Kaymak, U. (Eds.) et al Proc. of 2009 Int. Fuzzy Systems Assoc. World Congress and 2009 Int. Conf. of the Eur. Soc. for Fuzzy Logic and Technology (IFSA-EUSFLAT 2009 Joint Conference) (2009)

Two emergent properties in aggregation theory are investigated, namely horizontal maxitivity and comonotonic maxitivity (as well as their dual counterparts) which are commonly defined by means of certain ... [more ▼]

Two emergent properties in aggregation theory are investigated, namely horizontal maxitivity and comonotonic maxitivity (as well as their dual counterparts) which are commonly defined by means of certain functional equations. We present complete descriptions of the function classes axiomatized by each of these properties, up to weak versions of monotonicity, in the cases of horizontal maxitivity and minitivity. While studying the classes axiomatized by combinations of these properties, we introduce the concept of quasipolynomial function which appears as a natural extension of the well-established notion of polynomial function. We present further axiomatizations for this class both in terms of functional equations and natural relaxations of homogeneity and median decomposability. As noteworthy particular cases, we investigate those subclasses of quasi-term functions and quasi-weighted maximum and minimum functions, and present characterizations accordingly. [less ▲]

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See detailQuasi-polynomial functions over bounded distributive lattices
Couceiro, Miguel UL; Marichal, Jean-Luc UL

in Aequationes Mathematicae (2010), 80(3), 319-334

In [6] the authors introduced the notion of quasi-polynomial function as being a mapping $f\colon X^n\to X$ defined and valued on a bounded chain $X$ and which can be factorized as $f(x_1,\ldots,x_n)=p ... [more ▼]

In [6] the authors introduced the notion of quasi-polynomial function as being a mapping $f\colon X^n\to X$ defined and valued on a bounded chain $X$ and which can be factorized as $f(x_1,\ldots,x_n)=p(\varphi(x_1),\ldots,\varphi(x_n))$, where $p$ is a polynomial function (i.e., a combination of variables and constants using the chain operations $\wedge$ and $\vee$) and $\varphi$ is an order-preserving map. In the current paper we study this notion in the more general setting where the underlying domain and codomain sets are, possibly different, bounded distributive lattices, and where the inner function is not necessarily order-preserving. These functions appear naturally within the scope of decision making under uncertainty since, as shown in this paper, they subsume overall preference functionals associated with Sugeno integrals whose variables are transformed by a given utility function. To axiomatize the class of quasi-polynomial functions, we propose several generalizations of well-established properties in aggregation theory, as well as show that some of the characterizations given in [6] still hold in this general setting. Moreover, we investigate the so-called transformed polynomial functions (essentially, compositions of unary mappings with polynomial functions) and show that, under certain conditions, they reduce to quasi-polynomial functions. [less ▲]

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See detailQuasi-Schottky Diodes on (n)In.53Ga.47As With Barrier Heights of 0.6eV
Marso, Michel UL; Kordoš, P.; Meyer, R. et al

in Proceedings of the the MRS Fall Meeting, Symposium E, Boston, MA, USA (1991)

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See detailQuasicircles and width of Jordan curves in CP1
bonsante, francesco; danciger, jeffrey; maloni, sara et al

E-print/Working paper (2019)

We study a notion of "width" for Jordan curves in CP1, paying special attention to the class of quasicircles. The width of a Jordan curve is defined in terms of the geometry of its convex hull in ... [more ▼]

We study a notion of "width" for Jordan curves in CP1, paying special attention to the class of quasicircles. The width of a Jordan curve is defined in terms of the geometry of its convex hull in hyperbolic three-space. A similar invariant in the setting of anti de Sitter geometry was used by Bonsante-Schlenker to characterize quasicircles amongst a larger class of Jordan curves in the boundary of anti de Sitter space. By contrast to the AdS setting, we show that there are Jordan curves of bounded width which fail to be quasicircles. However, we show that Jordan curves with small width are quasicircles. [less ▲]

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See detailA quasicontinuum methodology for multiscale analyses of discrete microstructural models
Beex, Lars UL; Peerlings, Ron; Geers, Marc

in International Journal for Numerical Methods in Engineering (2011), 87(7), 701-718

Many studies in different research fields use lattice models to investigate the mechanical behavior of materials. Full lattice calculations are often performed to determine the influence of localized ... [more ▼]

Many studies in different research fields use lattice models to investigate the mechanical behavior of materials. Full lattice calculations are often performed to determine the influence of localized microscale phenomena on large-scale responses but they are usually computationally expensive. In this study the quasicontinuum (QC) method (Phil. Mag. A 1996; 73:1529–1563) is extended towards lattice models that employ discrete elements, such as trusses and beams. The QC method is a multiscale approach that uses a triangulation to interpolate the lattice model in regions with small fluctuations in the deformation field, while in regions of high interest the exact lattice model is obtained by refining the triangulation to the internal spacing of the lattice. Interpolation ensures that the number of unknowns is reduced while summation ensures that only a selective part of the underlying lattice model must be visited to construct the governing equations. As the QC method has so far only been applied to atomic lattice models, the existing summation procedures have been revisited for structural lattice models containing discrete elements. This has led to a new QC method that makes use of the characteristic structure of the considered truss network. The proposed QC method is, to the best of the authors’ knowledge, the only QC method that does not need any correction at the interface between the interpolated and the fully resolved region and at the same time gives exact results unlike the cluster QC methods. In its present formulation, the proposed QC method can only be used for lattice models containing nearest neighbor interactions, but with some minor adaptations it can also be used for lattices with next-nearest neighbor interactions such as atomic lattices. [less ▲]

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See detailQuasicontinuum methods for planar beam lattices (abstract)
Beex, Lars UL; Kerfriden, Pierre; Heaney, Claire et al

Scientific Conference (2015, July)

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See detailQuasicontinuum-based multiscale approaches for plate-like beam lattices experiencing in-plane and out-of-plane deformation
Beex, Lars UL; Kerfriden, Pierre; Rabczuk, Timon et al

in Computer Methods in Applied Mechanics & Engineering (2014), 279

The quasicontinuum (QC) method is a multiscale approach that aims to reduce the computational cost of discrete lattice computations. The method incorporates small-scale local lattice phenomena (e.g. a ... [more ▼]

The quasicontinuum (QC) method is a multiscale approach that aims to reduce the computational cost of discrete lattice computations. The method incorporates small-scale local lattice phenomena (e.g. a single lattice defect) in macroscale simulations. Since the method works directly and only on the beam lattice, QC frameworks do not require the construction and calibration of an accompanying continuum model (e.g. a cosserat/micropolar description). Furthermore, no coupling procedures are required between the regions of interest in which the beam lattice is fully resolved and coarse domains in which the lattice is effectively homogenized. Hence, the method is relatively straightforward to implement and calibrate. In this contribution, four variants of the QC method are investigated for their use for planar beam lattices which can also experience out-of-plane deformation. The different frameworks are compared to the direct lattice computations for three truly multiscale test cases in which a single lattice defect is present in an otherwise perfectly regular beam lattice. [less ▲]

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See detailQuasikristalle - 10 zaehlige Symmetrien gibt es nicht - oder doch
Schlichenmaier, Martin UL

Conference given outside the academic context (2014)

Detailed reference viewed: 57 (4 UL)