toggle visibility Search & Display Options

Select All    Deselect All
 |   | 
Details
   print
  Records Links
Author Fernandez, M.; Munoz, F.D.; Moreno, R. doi  openurl
  Title Analysis of imperfect competition in natural gas supply contracts for electric power generation: A closed-loop approach Type Journal Article
  Year 2020 Publication Energy Economics Abbreviated Journal Energy Econ.  
  Volume 87 Issue Pages 15 pp  
  Keywords Market power; Natural gas; Electricity market; Generalized Nash equilibrium; Equilibrium Problem with Equilibrium; Constraints  
  Abstract The supply of natural gas is generally based on contracts that are signed prior to the use of this fuel for power generation. Scarcity of natural gas in systems where a share of electricity demand is supplied with gas turbines does not necessarily imply demand rationing, because most gas turbines can still operate with diesel when natural gas is not available. However, scarcity conditions can lead to electricity price spikes, with welfare effects for consumers and generation firms. We develop a closed-loop equilibrium model to evaluate if generation firms have incentives to contract or import the socially-optimal volumes of natural gas to generate electricity. We consider a perfectly-competitive electricity market, where all firms act as price-takers in the short term, but assume that only a small number of firms own gas turbines and procure natural gas from, for instance, foreign suppliers in liquefied form. We illustrate an application of our model using a network reduction of the electric power system in Chile, considering two strategic firms that make annual decisions about natural gas imports in discrete quantities. We also assume that strategic firms compete in the electricity market with a set of competitive firms do not make strategic decisions about natural gas imports (i.e., a competitive fringe). Our results indicate that strategic firms could have incentives to sign natural gas contracts for volumes that are much lower than the socially-optimal ones, which leads to supernormal profits for these firms in the electricity market. Yet, this effect is rather sensitive to the price of natural gas. A high price of natural gas eliminates the incentives of generation firms to exercise market power through natural gas contracts. (C) 2020 Elsevier B.V. All rights reserved.  
  Address [Fernandez, Mauricio; Munoz, Francisco D.] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Santiago, Chile, Email: fdmunoz@uai.cl  
  Corporate Author Thesis  
  Publisher Elsevier Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0140-9883 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000536091600026 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1196  
Permanent link to this record
 

 
Author Fierro, I.; Jerez-Hanckes, C. doi  openurl
  Title Fast Calderon preconditioning for Helmholtz boundary integral equations Type Journal Article
  Year 2020 Publication Journal Of Computational Physics Abbreviated Journal J. Comput. Phys.  
  Volume 409 Issue Pages 22 pp  
  Keywords Operator preconditioning; Calderon preconditioning; Helmholtz equations; Hierarchical matrices; Fast solvers; Boundary elements method  
  Abstract Calderon multiplicative preconditioners are an effective way to improve the condition number of first kind boundary integral equations yielding provable mesh independent bounds. However, when discretizing by local low-order basis functions as in standard Galerkin boundary element methods, their computational performance worsens as meshes are refined. This stems from the barycentric mesh refinement used to construct dual basis functions that guarantee the discrete stability of L-2-pairings. Based on coarser quadrature rules over dual cells and H-matrix compression, we propose a family of fast preconditioners that significantly reduce assembly and computation times when compared to standard versions of Calderon preconditioning for the three-dimensional Helmholtz weakly and hyper-singular boundary integral operators. Several numerical experiments validate our claims and point towards further enhancements. (C) 2020 Elsevier Inc. All rights reserved.  
  Address [Fierro, Ignacia] UCL, Dept Math, Gower St, London, England, Email: carlos.jerez@uai.cl  
  Corporate Author Thesis  
  Publisher Academic Press Inc Elsevier Science Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0021-9991 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000522726000020 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1153  
Permanent link to this record
 

 
Author Garmendia, M.L.; Mondschein, S.; Montiel, B.; Kusanovic, J.P. doi  openurl
  Title Trend and predictors of gestational diabetes mellitus in Chile Type Journal Article
  Year 2020 Publication International Journal of Gynecology and Obstetrics Abbreviated Journal Int. J. Gynec. Obst.  
  Volume 148 Issue 2 Pages 210-218  
  Keywords  
  Abstract Objective

To examine the temporal trends in gestational diabetes mellitus (GDM) prevalence in Chile, and to determine the main predictors of GDM.

Methods

A secondary analysis was conducted of all birth records at Hospital Dr. Sótero del Río, Chile, from January 1, 2002, to December 31, 2015. We excluded those women with pre‐existing type 2 diabetes, those with missing data, and those with unlikely data. GDM was defined as fasting glucose levels >5.55 mmol/L [>100 mg/dL] or >7.77 mmol/L [>140 mg/dL] 2 hours after glucose load in the oral glucose tolerance test. Potential predictors were selected based on prior research and ease of evaluation.

Results

From the original database of 100 758 records, 86 362 women were included in the final cohort. The mean GDM prevalence was 7.6% (95% CI [confidence interval] 7.5%�7.8%), increasing from 4.4% (95% CI 4.0%�4.9%) in 2002 to 13.0% (95% CI 12.0%�13.9%) in 2015. Age, education, marital status, parity, family history of type 2 diabetes, personal history of GDM, hypertension and pre‐eclampsia, alcohol consumption, smoking, and pre‐gestational nutritional status performed well in the prediction of GDM.

Conclusion

One out of eight Chilean pregnant women of medium‐ to low socio‐economic status were found to develop GDM. We identified a set of easy‐to‐capture predictors in the primary health care system that may allow for the early identification of women at high‐risk for the development of GDM.
 
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0020-7292 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1045  
Permanent link to this record
 

 
Author Gill, S.; Wheatley, P.J.; Cooke, B.F.; Jordan, A.; Nielsen, L.D.; Bayliss, D.; Anderson, D.R.; Vines, J.I.; Lendl, M.; Acton, J.S.; Armstrong, D.J.; Bouchy, F.; Brahm, R.; Bryant, E.M.; Burleigh, M.R.; Casewell, S.L.; Eigmuller, P.; Espinoza, N.; Gillen, E.; Goad, M.R.; Grieves, N.; Gunther, M.N.; Henning, T.; Hobson, M.J.; Hogan, A.; Jenkins, J.S.; McCormac, J.; Moyano, M.; Osborn, H.P.; Pollacco, D.; Queloz, D.; Rauer, H.; Raynard, L.; Rojas, F.; Sarkis, P.; Smith, A.M.S.; Pinto, M.T.; Tilbrook, R.H.; Udry, S.; Watson, C.A.; West, R.G. doi  openurl
  Title NGTS-11 b (TOI-1847 b): A Transiting Warm Saturn Recovered from a TESS Single-transit Event Type Journal Article
  Year 2020 Publication Astrophysical Journal Letters Abbreviated Journal Astrophys. J. Lett.  
  Volume 898 Issue 1 Pages 6 pp  
  Keywords  
  Abstract We report the discovery of NGTS-11 b (=TOI-1847b), a transiting Saturn in a 35.46 day orbit around a mid K-type star (T-eff = 5050 +/- 80 K). We initially identified the system from a single-transit event in a TESS full-frame image light curve. Following 79 nights of photometric monitoring with an NGTS telescope, we observed a second full transit of NGTS-11 b approximately one year after the TESS single-transit event. The NGTS transit confirmed the parameters of the transit signal and restricted the orbital period to a set of 13 discrete periods. We combined our transit detections with precise radial-velocity measurements to determine the true orbital period and measure the mass of the planet. We find NGTS-11 b has a radius of 0.817 +/-(0.028)(0.032) R-Jup, a mass of 0.344 +/-(0.092)(0.073) M-Jup, and an equilibrium temperature of just 435 +/-(34)(32) K, making it one of the coolest known transiting gas giants. NGTS-11 b is the first exoplanet to be discovered after being initially identified as a TESS single-transit event, and its discovery highlights the power of intense photometric monitoring in recovering longer-period transiting exoplanets from single-transit events.  
  Address [Gill, Samuel; Wheatley, Peter J.; Armstrong, David J.; Bryant, Edward M.; Pollacco, Don] Univ Warwick, Ctr Exoplanets & Habitabil, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England, Email: samuel.gill@warwick.ac.uk  
  Corporate Author Thesis  
  Publisher Iop Publishing Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2041-8205 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000553513300001 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1213  
Permanent link to this record
 

 
Author Goles, E.; Montealegre, P. doi  openurl
  Title The complexity of the asynchronous prediction of the majority automata Type Journal Article
  Year 2020 Publication Information and Computation Abbreviated Journal Inform. Comput.  
  Volume to appear Issue Pages  
  Keywords Majority automata; Cellular automata; Prediction problem; Asynchronous updating; Computational complexity; Parallel algorithms; Bootstrap percolation; NP-Completeness  
  Abstract We consider the asynchronous prediction problem for some automaton as the one consisting in determining, given an initial configuration, if there exists a non-zero probability that some selected site changes its state, when the network is updated picking one site at a time uniformly at random. We show that for the majority automaton, the asynchronous prediction problem is in NC in the two-dimensional lattice with von Neumann neighborhood. Later, we show that in three or more dimensions the problem is NP-Complete.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0890-5401 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1124  
Permanent link to this record
 

 
Author Goles, E.; Lobos, F.; Ruz, G.A.; Sene, S. doi  openurl
  Title Attractor landscapes in Boolean networks with firing memory: a theoretical study applied to genetic networks Type Journal Article
  Year 2020 Publication Natural Computing Abbreviated Journal Nat. Comput.  
  Volume to appear Issue Pages 25 pp  
  Keywords Discrete dynamical systems; Boolean networks; Biological network modeling  
  Abstract In this paper we study the dynamical behavior of Boolean networks with firing memory, namely Boolean networks whose vertices are updated synchronously depending on their proper Boolean local transition functions so that each vertex remains at its firing state a finite number of steps. We prove in particular that these networks have the same computational power than the classical ones, i.e. any Boolean network with firing memory composed of m vertices can be simulated by a Boolean network by adding vertices. We also prove general results on specific classes of networks. For instance, we show that the existence of at least one delay greater than 1 in disjunctive networks makes such networks have only fixed points as attractors. Moreover, for arbitrary networks composed of two vertices, we characterize the delay phase space, i.e. the delay values such that networks admits limit cycles or fixed points. Finally, we analyze two classical biological models by introducing delays: the model of the immune control of the lambda\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\lambda $$\end{document}-phage and that of the genetic control of the floral morphogenesis of the plant Arabidopsis thaliana.  
  Address [Goles, Eric; Lobos, Fabiola; Ruz, Gonzalo A.] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Santiago, Chile, Email: eric.chacc@uai.cl;  
  Corporate Author Thesis  
  Publisher Springer Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1567-7818 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000531210800001 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1139  
Permanent link to this record
 

 
Author Goles, E.; Montealegre, P.; Rios-Wilson, M. doi  openurl
  Title On The Effects Of Firing Memory In The Dynamics Of Conjunctive Networks Type Journal Article
  Year 2020 Publication Discrete And Continuous Dynamical Systems Abbreviated Journal Discret. Contin. Dyn. Syst.  
  Volume 40 Issue 10 Pages 5765-5793  
  Keywords Discrete dynamical systems; boolean network; firing memory; conjunctive networks; prediction problem; and PSPACE  
  Abstract A boolean network is a map F : {0, 1}(n) -> {0, 1}(n) that defines a discrete dynamical system by the subsequent iterations of F. Nevertheless, it is thought that this definition is not always reliable in the context of applications, especially in biology. Concerning this issue, models based in the concept of adding asynchronicity to the dynamics were propose. Particularly, we are interested in a approach based in the concept of delay. We focus in a specific type of delay called firing memory and it effects in the dynamics of symmetric (non-directed) conjunctive networks. We find, in the caseis in which the implementation of the delay is not uniform, that all the complexity of the dynamics is somehow encapsulated in the component in which the delay has effect. Thus, we show, in the homogeneous case, that it is possible to exhibit attractors of non-polynomial period. In addition, we study the prediction problem consisting in, given an initial condition, determinate if a fixed coordinate will eventually change its state. We find again that in the non-homogeneous case all the complexity is determined by the component that is affected by the delay and we conclude in the homogeneous case that this problem is PSPACE-complete.  
  Address [Goles, Eric; Montealegre, Pedro] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Diagonal Torres 2650, Santiago, Chile, Email: eric.chacc@uai.cl;  
  Corporate Author Thesis  
  Publisher Amer Inst Mathematical Sciences-Aims Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1078-0947 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000545661800006 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1183  
Permanent link to this record
 

 
Author Goles, E.; Tsompanas, M.A.; Adamatzky, A.; Tegelaar, M.; Wosten, H.A.B.; Martinez, G.J. doi  openurl
  Title Computational universality of fungal sandpile automata Type Journal Article
  Year 2020 Publication Physics Letters A Abbreviated Journal Phys. Lett. A  
  Volume 384 Issue 22 Pages 8 pp  
  Keywords Fungi; Sandpile automata; Computational universality  
  Abstract Hyphae within the mycelia of the ascomycetous fungi are compartmentalised by septa. Each septum has a pore that allows for inter-compartmental and inter-hyphal streaming of cytosol and even organelles. The compartments, however, have special organelles, Woronin bodies, that can plug the pores. When the pores are blocked, no flow of cytoplasm takes place. Inspired by the controllable compartmentalisation within the mycelium of the ascomycetous fungi we designed two-dimensional fungal automata. A fungal automaton is a cellular automaton where communication between neighbouring cells can be blocked on demand. We demonstrate computational universality of the fungal automata by implementing sandpile cellular automata circuits there. We reduce the Monotone Circuit Value Problem to the Fungal Automaton Prediction Problem. We construct families of wires, cross-overs and gates to prove that the fungal automata are P-complete. (C) 2020 Elsevier B.V. All rights reserved.  
  Address [Goles, Eric; Tsompanas, Michail-Antisthenis; Adamatzky, Andrew; Martinez, Genaro J.] Univ West England, Unconvent Comp Lab, Bristol, Avon, England, Email: andrew.adamatzky@uwe.ac.uk  
  Corporate Author Thesis  
  Publisher Elsevier Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0375-9601 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000537033500017 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1194  
Permanent link to this record
 

 
Author Golovach, P.A.; Heggernes, P.; Lima, P.T.; Montealegre, P. doi  openurl
  Title Finding connected secluded subgraphs Type Journal Article
  Year 2020 Publication Journal Of Computer And System Sciences Abbreviated Journal J. Comput. Syst. Sci.  
  Volume 113 Issue Pages 101-124  
  Keywords Secluded subgraph; Parameterized complexity; Forbidden subgraphs  
  Abstract Problems related to finding induced subgraphs satisfying given properties form one of the most studied areas within graph algorithms. However, for many applications, it is desirable that the found subgraph has as few connections to the rest of the graph as possible, which gives rise to the SECLUDED Pi-SUBGRAPH problem. Here, input k is the size of the desired subgraph, and input t is a limit on the number of neighbors this subgraph has in the rest of the graph. This problem has been studied from a parameterized perspective, and unfortunately it turns out to be W[1]-hard for many graph properties Pi, even when parameterized by k + t. We show that the situation changes when we are looking for a connected induced subgraph satisfying Pi. In particular, we show that the CONNECTED SECLUDED Pi-SUBGRAPH problem is FPT when parameterized by just t for many important graph properties Pi. (C) 2020 Elsevier Inc. All rights reserved.  
  Address [Golovach, Petr A.; Heggernes, Pinar; Lima, Paloma T.] Univ Bergen, Dept Informat, N-5020 Bergen, Norway, Email: petr.golovach@uib.no;  
  Corporate Author Thesis  
  Publisher Academic Press Inc Elsevier Science Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0022-0000 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000539435200006 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1191  
Permanent link to this record
 

 
Author Gonzalez, E.; Villena, M.J. doi  openurl
  Title On the spatial dynamics of vaccination: A spatial SIRS-V model Type Journal Article
  Year 2020 Publication Computers & Mathematics With Applications Abbreviated Journal Comput. Math. Appl.  
  Volume 80 Issue 5 Pages 733-743  
  Keywords Epidemic dynamics; Spatial SIR model; Vaccination strategy; Non-linear system of partial differential equations; Numerical modeling  
  Abstract In this paper, we analyze the effects of vaccination from a spatial perspective. We propose a spatial deterministic SIRS-V model, which considers a non-linear system of partial differential equations with explicit attrition and diffusion terms for the vaccination process. The model allows us to simulate numerically the spatial and temporal dynamics of an epidemic, considering different spatial strategies for the vaccination policy. In particular, in our first example we analyze the classical SIRS-V evolution with the addition of movements due to diffusion, while in the second one we focus on modeling one ring vaccination policy. We expect this model can improve spatial predictions of SIR vaccination models by taking into account the spatial dimension of the problem. (C) 2020 Elsevier Ltd. All rights reserved.  
  Address [Gonzalez, Eduardo] Univ Finis Terrae, Fac Engn, Santiago, Chile, Email: e.gonzalez@ieee.org;  
  Corporate Author Thesis  
  Publisher Pergamon-Elsevier Science Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0898-1221 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000557765800010 Approved no  
  Call Number UAI @ alexi.delcanto @ Serial 1220  
Permanent link to this record
 

 
Author Gravelle, S.; Dumais, J. doi  openurl
  Title A multi-scale model for fluid transport through a bio-inspired passive valve Type Journal Article
  Year 2020 Publication Journal Of Chemical Physics Abbreviated Journal J. Chem. Phys.  
  Volume 152 Issue 1 Pages 10 pp  
  Keywords  
  Abstract Tillandsia landbeckii is a rootless plant thriving in the hyper-arid Atacama Desert of Chile. These plants use unique cellulose-based microscopic structures called trichomes to collect fresh water from coastal fog. The trichomes rely on a passive mechanism to maintain an asymmetrical transport of water: they allow for the fast absorption of liquid water deposited by sporadic fog events while preventing evaporation during extended drought periods. Inspired by the trichome's design, we study fluid transport through a micrometric valve. Combining Grand Canonical Monte Carlo with Non-Equilibrium Molecular Dynamics simulations, we first analyze the adsorption and transport of a fluid through a single nanopore at different chemical potentials. We then scale up the atomic results using a lattice approach, and simulate the transport at the micrometric scale. Results obtained for a model Lennard-Jones fluid and TIP4P/2005 water were compared, allowing us to identify the key physical parameters for achieving a passive hydraulic valve. Our results show that the difference in transport properties of water vapor and liquid water within the cellulose layer is the basis for the ability of the Tillandsia trichome to function as a water valve. Finally, we predict a critical pore dimension above which the cellulose layer can form an efficient valve.  
  Address [Gravelle, Simon; Dumais, Jacques] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Vina Del Mar, Chile, Email: simon.gravelle@live.fr  
  Corporate Author Thesis  
  Publisher Amer Inst Physics Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0021-9606 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000505578700020 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1083  
Permanent link to this record
 

 
Author Guevara, E.; Babonneau, F.; Homem-de-Mello, T.; Moret, S. doi  openurl
  Title A machine learning and distributionally robust optimization framework for strategic energy planning under uncertainty Type Journal Article
  Year 2020 Publication Applied Energy Abbreviated Journal Appl. Energy  
  Volume 271 Issue Pages 18 pp  
  Keywords Strategic energy planning; Electricity generation; Uncertainty; Distributionally robust optimization; Machine learning  
  Abstract This paper investigates how the choice of stochastic approaches and distribution assumptions impacts strategic investment decisions in energy planning problems. We formulate a two-stage stochastic programming model assuming different distributions for the input parameters and show that there is significant discrepancy among the associated stochastic solutions and other robust solutions published in the literature. To remedy this sensitivity issue, we propose a combined machine learning and distributionally robust optimization (DRO) approach which produces more robust and stable strategic investment decisions with respect to uncertainty assumptions. DRO is applied to deal with ambiguous probability distributions and Machine Learning is used to restrict the DRO model to a subset of important uncertain parameters ensuring computational tractability. Finally, we perform an out-of-sample simulation process to evaluate solutions performances. The Swiss energy system is used as a case study all along the paper to validate the approach.  
  Address [Guevara, Esnil] Univ Adolfo Ibanez, PhD Program Ind Engn & Operat Res, Santiago, Chile, Email: frederic.babonneau@uai.cl  
  Corporate Author Thesis  
  Publisher Elsevier Sci Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0306-2619 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000540436500003 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1188  
Permanent link to this record
 

 
Author Guzman, R.; Harrison, R.; Abarca, N.; Villena, M.G. pdf  doi
openurl 
  Title A game-theoretic model of reciprocity and trust that incorporates personality traits Type Journal Article
  Year 2020 Publication Journal Of Behavioral And Experimental Economics Abbreviated Journal J. Behav. Exp. Econ.  
  Volume 84 Issue Pages 11 pp  
  Keywords Reciprocity; Trust; Personality; Psychometrics; Revealed preferences  
  Abstract We propose a game-theoretic model of reciprocity and trust that incorporates personality traits. In the model, positive and negative reciprocity are “reciprocal preferences:” parameters of heterogeneous utility functions that take into account the material welfare of others (positively if they have been kind, negatively if they have been hostile). Trust, on the other hand, is an individual bias that distorts probabilistic beliefs about the trustworthiness of others. Unlike typical game-theoretic models, our model provides an explanation for the heterogeneity of preferences and probabilistic beliefs: a person's personality traits determine both the parameters of his utility function and the magnitude of his beleif bias. We tested the model experimentally. Subjects completed a psychometric questionnaire that measures three personality traits: positive reciprocity, negative reciprocity, and trust. Subsequently, they played a sequential prisoner's dilemma with random re-matching and payoffs changing from round to round. From the subjects' psychometric scores and game behaviors we inferred the relationship between reciprocal preferences, belief biases, and personality. The results confirmed the hypotheses of the model.  
  Address [Guzman, Ricardo] Univ Desarrollo, Fac Gobierno, Concepcion, Chile, Email: mg.villena@gmail.com  
  Corporate Author Thesis  
  Publisher Elsevier Science Inc Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2214-8043 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000517586800011 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1118  
Permanent link to this record
 

 
Author Hartman, J.D.; Jordan, A.; Bayliss, D.; Bakos, G.A.; Bento, J.; Bhatti, W.; Brahm, R.; Csubry, Z.; Espinoza, N.; Henning, T.; Mancini, L.; Penev, K.; Rabus, M.; Sarkis, P.; Suc, V.; de Val-Borro, M.; Zhou, G.; Crane, J.D.; Shectman, S.; Teske, J.K.; Wang, S.X.; Butler, R.P.; Lazar, J.; Papp, I.; Sari, P.; Anderson, D.R.; Hellier, C.; West, R.G.; Barkaoui, K.; Pozuelos, F.J.; Jehin, E.; Gillon, M.; Nielsen, L.; Lendl, M.; Udry, S.; Ricker, G.R.; Vanderspek, R.; Latham, D.W.; Seager, S.; Winn, J.N.; Christiansen, J.; Crossfield, I.J.M.; Henze, C.E.; Jenkins, J.M.; Smith, J.C.; Ting, E.B. doi  openurl
  Title HATS-47b, HATS-48Ab, HATS-49b, and HATS-72b: Four Warm Giant Planets Transiting K Dwarfs Type Journal Article
  Year 2020 Publication Astronomical Journal Abbreviated Journal Astron. J.  
  Volume 159 Issue 4 Pages 23 pp  
  Keywords Exoplanets; Extrasolar gas giants; Hot Jupiters; Transits  
  Abstract We report the discovery of four transiting giant planets around K dwarfs. The planets HATS-47b, HATS-48Ab, HATS49b, and HATS-72b have masses of 0.369+ 0.0210.031MJ, 0.243+ 0.0300.022 MJ, 0.353+ 0.0270.038 MJ, and 0.1254. 0.0039 MJ, respectively, and radii of 1.117. 0.014 RJ, 0.800. 0.015 RJ, 0.765. 0.013 RJ, and 0.7224. 0.0032 RJ, respectively. The planets orbit close to their host stars with orbital periods of 3.9228 days, 3.1317 days, 4.1480 days, and 7.3279 days, respectively. The hosts are main-sequence K dwarfs with masses of 0.674+ 0.0120.016.M, 0.7279. 0.0066.M, 0.7133. 0.0075.M, and 0.7311. 0.0028, and with V-band magnitudes of V = 14.829. 0.010, 14.35. 0.11, 14.998. 0.040 and 12.469. 0.010. The super-Neptune HATS-72b (a.k.a. WASP-191b and TOI 294.01) was independently identified as a transiting planet candidate by the HATSouth, WASP, and TESS surveys, and we present a combined analysis of all of the data gathered by each of these projects (and their follow-up programs). An exceptionally precise mass is measured for HATS-72b thanks to high-precision radial velocity (RV) measurements obtained with VLT/ESPRESSO, FEROS, HARPS, and Magellan/PFS. We also incorporate TESS observations of the warm Saturn-hosting systems HATS-47 (a.k.a. TOI.1073.01), HATS-48A, and HATS-49. HATS-47 was independently identified as a candidate by the TESS team, while the other two systems were not previously identified from the TESS data. The RV orbital variations are measured for these systems using Magellan/PFS. HATS-48A has a resolved 5.. 4 neighbor in Gaia.DR2, which is a common-proper-motion binary star companion to HATS-48A with a mass of 0.22.M and a current projected physical separation of similar to 1400 au.  
  Address [Hartman, J. D.; Bakos, G. A.; Bhatti, W.; Csubry, Z.; Winn, Joshua N.] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA, Email: jhartman@astro.princeton.edu  
  Corporate Author Thesis  
  Publisher Iop Publishing Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0004-6256 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000522443100001 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1155  
Permanent link to this record
 

 
Author Hiptmair, R.; Jerez-Hanckes, C.; Urzúa-Torres, C. doi  openurl
  Title Optimal Operator Preconditioning For Galerkin Boundary Element Methods On 3D Screens Type Journal Article
  Year 2020 Publication SIAM Journal on Numerical Analysis Abbreviated Journal SIAM J. Num. Anal.  
  Volume 58 Issue 1 Pages 834-857  
  Keywords  
  Abstract We consider first-kind weakly singular and hypersingular boundary integral operators for the Laplacian on screens in $\mathbb{R}^{3}$ and their Galerkin discretization by means of low-order piecewise polynomial boundary elements. For the resulting linear systems of equations we propose novel Calderón-type preconditioners based on (i) new boundary integral operators, which provide the exact inverses of the weakly singular and hypersingular operators on flat disks, and (ii) stable duality pairings relying on dual meshes. On screens obtained as images of the unit disk under bi-Lipschitz transformations, this approach achieves condition numbers uniformly bounded in the meshwidth even on locally refined meshes. Comprehensive numerical tests also confirm its excellent preasymptotic performance.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0036-1429 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1011  
Permanent link to this record
 

 
Author Hochart, A. doi  openurl
  Title Unique Ergodicity of Deterministic Zero-Sum Differential Games Type Journal Article
  Year 2020 Publication Dynamic Games And Applications Abbreviated Journal Dyn. Games Appl.  
  Volume to appear Issue Pages 28 pp  
  Keywords Differential games; Hamilton-Jacobi equations; Viscosity solutions; Ergodicity; Limit value  
  Abstract We study the ergodicity of deterministic two-person zero-sum differential games. This property is defined by the uniform convergence to a constant of either the infinite-horizon discounted value as the discount factor tends to zero, or equivalently, the averaged finite-horizon value as the time goes to infinity. We provide necessary and sufficient conditions for the unique ergodicity of a game. This notion extends the classical one for dynamical systems, namely when ergodicity holds with any (suitable) perturbation of the running payoff function. Our main condition is symmetric between the two players and involve dominions, i.e., subsets of states that one player can make approximately invariant.  
  Address [Hochart, Antoine] Univ Adolfo Ibanez, Fac Ingn & Ciencia, Diagonal Las Torres 2640, Santiago, Chile, Email: antoine.hochart@gmail.com  
  Corporate Author Thesis  
  Publisher Springer Birkhauser Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2153-0785 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000527444200001 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1148  
Permanent link to this record
 

 
Author Hojman, S.A.; Asenjo, F.A. doi  openurl
  Title Classical and Quantum Dispersion Relations Type Journal Article
  Year 2020 Publication Physica Scripta Abbreviated Journal Phys. Scr.  
  Volume 95 Issue 8 Pages 7 pp  
  Keywords Quantum Hamilton-Jacobi equation; Bohm potential; dispersion relation  
  Abstract It is showed that, in general, classical and quantum dispersion relations are different due to the presence of the Bohm potential. There are exact particular solutions of the quantum (wave) theory which obey the classical dispersion relation, but they differ in the general case. The dispersion relations may also coincide when additional assumptions are made, such as WKB or eikonal approximations, for instance. This general result also holds for non-quantum wave equations derived from classical counterparts, such as in ray and wave optics, for instance. Explicit examples are given for covariant scalar, vectorial and tensorial fields in flat and curved spacetimes.  
  Address [Hojman, Sergio A.] Univ Adolfo Ibanez, Fac Artes Liberales, Dept Ciencias, Santiago 7491169, Chile, Email: sergio.hojman@uai.cl;  
  Corporate Author Thesis  
  Publisher Iop Publishing Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0031-8949 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000543208700001 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1184  
Permanent link to this record
 

 
Author Hojman, S.A.; Asenjo, F.A. doi  openurl
  Title Dual wavefunctions in two-dimensional quantum mechanics Type Journal Article
  Year 2020 Publication Physics Letters A Abbreviated Journal Phys. Lett. A  
  Volume 384 Issue 13 Pages 5 pp  
  Keywords Schrodinger equation; Dual solution; Bohm potential; Two-dimensions; Optics  
  Abstract It is shown that the Schrodinger equation for a large family of pairs of two-dimensional quantum potentials possess wavefunctions for which the amplitude and the phase are interchangeable, producing two different solutions which are dual to each other. This is a property of solutions with vanishing Bohm potential. These solutions can be extended to three-dimensional systems. We explicitly calculate dual solutions for physical systems, such as the repulsive harmonic oscillator and the two-dimensional hydrogen atom. These dual wavefunctions are also solutions of an analogue optical system in the eikonal limit. In this case, the potential is related to the refractive index, allowing the study of this two-dimensional dual wavefunction solutions with an optical (analogue) system. (C) 2020 Elsevier B.V. All rights reserved.  
  Address [Hojman, Sergio A.] Univ Adolfo Ibanez, Dept Ciencias, Fac Artes Liberales, Santiago 7491169, Chile, Email: sergio.hojman@uai.cl;  
  Corporate Author Thesis  
  Publisher Elsevier Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0375-9601 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000525434900002 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1152  
Permanent link to this record
 

 
Author Jerez-Hanckes, C.; Pinto, J. doi  openurl
  Title High-order Galerkin method for Helmholtz and Laplace problems on multiple open arcs Type Journal Article
  Year 2020 Publication Mathematical Modelling and Numerical Analysis Abbreviated Journal  
  Volume to appear Issue Pages  
  Keywords  
  Abstract We present a spectral Galerkin numerical scheme for solving Helmholtz and Laplace prob- lems with Dirichlet boundary conditions on a finite collection of open arcs in two-dimensional space. A boundary integral method is employed, giving rise to a first kind Fredholm equation whose variational form is discretized using weighted Chebyshev polynomials. Well-posedness of the discrete problems is established as well as algebraic or even exponential convergence rates depending on the regularities of both arcs and excitations. Our numerical experiments show the robustness of the method with respect to number of arcs and large wavenumber range. Moreover, we present a suitable compression algorithm that further accelerates computational times.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0764-583X ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1126  
Permanent link to this record
 

 
Author Jerez-Hanckes, C.; Pettersson, I.; Rybalko, V. pdf  doi
openurl 
  Title Derivation Of Cable Equation By Multiscale Analysis For A Model Of Myelinated Axons Type Journal Article
  Year 2020 Publication Discrete And Continuous Dynamical Systems-Series B Abbreviated Journal Discrete Contin. Dyn. Syst.-Ser. B  
  Volume 25 Issue 3 Pages 815-839  
  Keywords Hodgkin-Huxley model; nonlinear cable equation; cellular electrophysiology; multiscale modeling; homogenization  
  Abstract We derive a one-dimensional cable model for the electric potential propagation along an axon. Since the typical thickness of an axon is much smaller than its length, and the myelin sheath is distributed periodically along the neuron, we simplify the problem geometry to a thin cylinder with alternating myelinated and unmyelinated parts. Both the microstructure period and the cylinder thickness are assumed to be of order epsilon, a small positive parameter. Assuming a nonzero conductivity of the myelin sheath, we find a critical scaling with respect to epsilon which leads to the appearance of an additional potential in the homogenized nonlinear cable equation. This potential contains information about the geometry of the myelin sheath in the original three-dimensional model.  
  Address [Jerez-Hanckes, Carlos] Univ Adolfo Ibanez, Fac Engn & Sci, Diagonal Torres 2700, Santiago, Chile, Email: carlos.jerez@uai.cl;  
  Corporate Author Thesis  
  Publisher Amer Inst Mathematical Sciences-Aims Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1531-3492 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000501609800001 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 1069  
Permanent link to this record
Select All    Deselect All
 |   | 
Details
   print

Save Citations:
Export Records: