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Author Araya-Letelier, G.; Concha-Riedel, J.; Antico, F.C.; Valdes, C.; Caceres, G. pdf  doi
openurl 
  Title Influence of natural fiber dosage and length on adobe mixes damage-mechanical behavior Type Journal Article
  Year 2018 Publication Construction And Building Materials Abbreviated Journal Constr. Build. Mater.  
  Volume 174 Issue Pages 645-655  
  Keywords  
  Abstract This study addresses the use of a natural fiber (pig hair), a massive food-industry waste, as reinforcement in adobe mixes (a specific type of earthen material). The relevance of this work resides in the fact that earthen materials are still widely used worldwide because of their low cost, availability, and low environmental impact. Results show that adobe mixes’ mechanical-damage behavior is sensitive to both (i) fiber dosage and (ii) fiber length. Impact strength and flexural toughness are increased, whereas shrinkage distributed crack width is reduced. Average values of compressive and flexural strengths are reduced as fiber dosage and length increase, as a result of porosity generated by fiber clustering. Based on the results of this work a dosage of 0.5% by weight of dry soil using 7 mm fibers is optimal to improve crack control, flexural toughness and impact strength without statistically affecting flexural and compressive strengths.  
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  Series Volume Series Issue Edition  
  ISSN 0950-0618 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 865  
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Author Li, B.; Moataz, F.Z.; Nisse, N.; Suchan, K. pdf  doi
openurl 
  Title Minimum size tree-decompositions Type Journal Article
  Year 2018 Publication Discrete Applied Mathematics Abbreviated Journal Discret Appl. Math.  
  Volume 245 Issue Pages 109-127  
  Keywords Tree-decomposition; Treewidth; NP-hard  
  Abstract We study in this paper the problem of computing a tree-decomposition of a graph with width at most k and minimum number of bags. More precisely, we focus on the following problem: given a fixed k>=1, what is the complexity of computing a tree-decomposition of width at most k with minimum number of bags in the class of graphs with treewidth at most k? We prove that the problem is NP-complete for any fixed k>=4 and polynomial for k<=2; for k=3, we show that it is polynomial in the class of trees and 2-connected outerplanar graphs.  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0166-218x ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 864  
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Author Montalva-Medel, M.; de Oliveira, P.P.B.; Goles, E. doi  openurl
  Title A portfolio of classification problems by one-dimensional cellular automata, over cyclic binary configurations and parallel update Type Journal Article
  Year 2018 Publication Natural Computing Abbreviated Journal Nat. Comp.  
  Volume to appear Issue Pages  
  Keywords  
  Abstract Decision problems addressed by cellular automata have been historically expressed either as determining whether initial configurations would belong to a given language, or as classifying the initial configurations according to a property in them. Unlike traditional approaches in language recognition, classification problems have typically relied upon cyclic configurations and fully paralell (two-way) update of the cells, which render the action of the cellular automaton relatively less controllable and difficult to analyse. Although the notion of cyclic languages have been studied in the wider realm of formal languages, only recently a more systematic attempt has come into play in respect to cellular automata with fully parallel update. With the goal of contributing to this effort, we propose a unified definition of classification problem for one-dimensional, binary cellular automata, from which various known problems are couched in and novel ones are defined, and analyse the solvability of the new problems. Such a unified perspective aims at increasing existing knowledge about classification problems by cellular automata over cyclic configurations and parallel update.  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1567-7818 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 863  
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Author Rengifo, F.; Ruz, G.A.; Mascareno, A. pdf  doi
openurl 
  Title Managing the 1920s’ Chilean educational crisis: A historical view combined with machine learning Type Journal Article
  Year 2018 Publication Plos One Abbreviated Journal PLoS One  
  Volume 13 Issue 5 Pages e0197429  
  Keywords  
  Abstract In the first decades of the 20th century, political actors diagnosed the incubation of a crisis in the Chilean schooling process. Low rates of enrollment, literacy, and attendance, inefficiency in the use of resources, poverty, and a reduced number of schools were the main factors explaining the crisis. As a response, the Law on Compulsory Primary Education, considering mandatory for children between 6 and 14 years old to attend any school for at least four years, was passed in 1920. Using data from Censuses of the Republic of Chile from 1920 and 1930, reports of the Ministry of Justice, the Ministry of Education, and the Statistical Yearbooks between 1895 and 1930, we apply machine learning techniques (clustering and decision trees) to assess the impact of this law on the Chilean schooling process between 1920 and 1930. We conclude that the law had a positive impact on the schooling indicators in this period. Even though it did not overcome the differences between urban and rural zones, it brought about a general improvement of the schooling process and a more efficient use of resources and infrastructure in both big urban centers and small-urban and rural zones, thereby managing the so-called crisis of the Republic.  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1932-6203 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 862  
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Author Deacon, R.M.J.; Hurley, M.J.; Rebolledo, C.M.; Snape, M.; Altimiras, F.J.; Farias, L.; Pino, M.; Biekofsky, R.; Glass, L.; Cogram, P. doi  openurl
  Title Nrf2: a novel therapeutic target in fragile X syndrome is modulated by NNZ2566 Type Journal Article
  Year 2017 Publication Genes Brain And Behavior Abbreviated Journal Genes Brain Behav.  
  Volume 16 Issue 7 Pages 1-10  
  Keywords Autism spectrum disorder; behavior; E-cadherin; Fmr1 knockout mouse; fragile X syndrome; GST-alpha 1; NNZ2566; NQO1; Nrf2/ARE pathway; oxidative stress  
  Abstract Fragile X-associated disorders are a family of genetic conditions resulting from the partial or complete loss of fragile X mental retardation protein (FMRP). Among these disorders, fragile X syndrome (FXS) is the most common cause of inherited intellectual disability and autism. Progress in basic neuroscience has led to identification of molecular targets for treatment in FXS; however, there is a gap in translation to targeted therapies in humans. This study introduces a novel therapeutic target for FXS, nuclear factor (erythroid-derived 2)-like 2 (Nrf2), a transcription factor known to induce expression of over 100 cytoprotective genes. We also show that NNZ2566, a drug that has successfully completed a phase 2 clinical trial in FXS, is effective in modulating this target in FXS, partially reversing the FXS phenotype; NNZ2566 has a therapeutic role as Nrf2 activator. Effectively, treatment with NNZ2566 normalizes the translocation of Nrf2 to the nucleus, inducing expression of numerous oxidative stress-related genes including NQO1 (NAD(P) H dehydrogenase quinone 1), GST-alpha 1 (glutathione S-transferase alpha-1) and EH (epoxide hydrolase) and has a knockdown effect on E-cadherin. In summary, the Nrf2/ARE (antioxidant response element) pathway appears to be a novel promising therapeutic target for FXS and NNZ2566 appears to be acting as an activator of the Nrf2/ARE pathway and suggests a potential benefit across multiple symptoms that could be associated with the pathobiological processes underlying FXS.  
  Address [Deacon, R. M. J.; Altimiras, F. J.; Farias, L.; Pino, M.; Cogram, P.] Fraunhofer Res Fdn, Biomed Div, Ctr Syst Biotechnol, Santiago, Chile, Email: robertmj.deacon@gmail.com;  
  Corporate Author Thesis  
  Publisher Wiley Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1601-1848 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000410314200008 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 861  
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Author Altimiras, F.; Uszczynska-Ratajczak, B.; Camara, F.; Vlasova, A.; Palumbo, E.; Newhouse, S.; Deacon, R.M.J.; Farias, L.A.E.; Hurley, M.J.; Loyola, D.E.; Vasquez, R.A.; Dobson, R.; Guigo, R.; Cogram, P. doi  openurl
  Title Brain Transcriptome Sequencing of a Natural Model of Alzheimer's Disease Type Journal Article
  Year 2017 Publication Frontiers In Aging Neuroscience Abbreviated Journal Front. Aging Neurosci.  
  Volume 9 Issue Pages 8 pp  
  Keywords Alzheimer's disease; Octodon degus; RNA-seq; gene expression; animal models  
  Abstract  
  Address [Altimiras, Francisco; Farias, Leandro A. E.] Univ Adolfo Ibanez, Fac Sci & Engn, Santiago, Chile, Email: fjaltimiras@gmail.com;  
  Corporate Author Thesis  
  Publisher Frontiers Media Sa Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1663-4365 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000396812400001 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 860  
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Author Di Genova, A.; Ruz, G.A.; Sagot, M.-F.; Maass, A. pdf  doi
openurl 
  Title Fast-SG: an alignment-free algorithm for hybrid assembly Type Journal Article
  Year 2018 Publication GigaScience Abbreviated Journal  
  Volume 7 Issue 5 Pages giy048-giy048  
  Keywords  
  Abstract BackgroundLong-read sequencing technologies are the ultimate solution for genome repeats, allowing near reference-level reconstructions of large genomes. However, long-read de novo assembly pipelines are computationally intense and require a considerable amount of coverage, thereby hindering their broad application to the assembly of large genomes. Alternatively, hybrid assembly methods that combine short- and long-read sequencing technologies can reduce the time and cost required to produce de novo assemblies of large genomes.ResultsHere, we propose a new method, called Fast-SG, that uses a new ultrafast alignment-free algorithm specifically designed for constructing a scaffolding graph using light-weight data structures. Fast-SG can construct the graph from either short or long reads. This allows the reuse of efficient algorithms designed for short-read data and permits the definition of novel modular hybrid assembly pipelines. Using comprehensive standard datasets and benchmarks, we show how Fast-SG outperforms the state-of-the-art short-read aligners when building the scaffoldinggraph and can be used to extract linking information from either raw or error-corrected long reads. We also show how a hybrid assembly approach using Fast-SG with shallow long-read coverage (5X) and moderate computational resources can produce long-range and accurate reconstructions of the genomes of Arabidopsis thaliana (Ler-0) and human (NA12878).ConclusionsFast-SG opens a door to achieve accurate hybrid long-range reconstructions of large genomes with low effort, high portability, and low cost.  
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  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 859  
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Author Araujo, J.; Ducoffe, G.; Nisse, N.; Suchan, K. pdf  url
openurl 
  Title On interval number in cycle convexity Type Journal Article
  Year 2018 Publication Discrete Mathematics And Theoretical Computer Science Abbreviated Journal Discret. Math. Theor. Comput. Sci.  
  Volume 20 Issue 1 Pages 35 pp  
  Keywords graph convexity; interval number; domination problems in graphs; complexity and algorithms  
  Abstract Recently, Araujo et al. [Manuscript in preparation, 2017] introduced the notion of Cycle Convexity of graphs. In their seminal work, they studied the graph convexity parameter called hull number for this new graph convexity they proposed, and they presented some of its applications in Knot theory. Roughly, the tunnel number of a knot embedded in a plane is upper bounded by the hull number of a corresponding planar 4-regular graph in cycle convexity. In this paper, we go further in the study of this new graph convexity and we study the interval number of a graph in cycle convexity. This parameter is, alongside the hull number, one of the most studied parameters in the literature about graph convexities. Precisely, given a graph G, its interval number in cycle convexity, denoted by in(cc)(G), is the minimum cardinality of a set S subset of V (G) such that every vertex w is an element of E V (G) \ S has two distinct neighbors u, v is an element of S such that u and v lie in same connected component of G[S], i.e. the subgraph of G induced by the vertices in S. In this work, first we provide bounds on in(cc) (G) and its relations to other graph convexity parameters, and explore its behaviour on grids. Then, we present some hardness results by showing that deciding whetherin(cc) (G) <= k is NP-complete, even if G is a split graph or a bounded-degree planar graph, and that the problem is W[2]-hard in bipartite graphs when k is the parameter. As a consequence, we obtain that in(cc) (G) cannot be approximated up to a constant factor in the classes of split graphs and bipartite graphs (unless P = NP). On the positive side, we present polynomial-time algorithms to compute in(cc) (G) for outerplanar graphs, cobipartite graphs and interval graphs. We also present fixed-parameter tractable (FPT) algorithms to compute it for (q, q – 4)-graphs when q is the parameter and for general graphs G when parameterized either by the treewidth or the neighborhood diversity of G. Some of our hardness results and positive results are not known to hold for related graph convexities and domination problems. We hope that the design of our new reductions and polynomial-time algorithms can be helpful in order to advance in the study of related graph problems.  
  Address [Araujo, Julio] Univ Fed Ceara, Dept Matemat, ParGO, Fortaleza, Ceara, Brazil  
  Corporate Author Thesis  
  Publisher Discrete Mathematics Theoretical Computer Science Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1462-7264 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000431858800001 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 858  
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Author Moreno, S.; Neville, J.; Kirshner, S. pdf  doi
openurl 
  Title Tied Kronecker Product Graph Models to Capture Variance in Network Populations Type Journal Article
  Year 2018 Publication Acm Transactions On Knowledge Discovery From Data Abbreviated Journal ACM Trans. Knowl. Discov. Data  
  Volume 12 Issue 3 Pages 40 pp  
  Keywords Graph generation models; social network analysis; kronecker product graph models  
  Abstract Much of the past work on mining and modeling networks has focused on understanding the observed propel ties of single example graphs. However, in many real-life applications it is important to characterize the structure of populations of graphs. In this work, we analyze the distributional properties of probabilistic generative graph models (PGGMs) for network populations. PGGMs are statistical methods that model the network distribution and match common characteristics of real-world networks. Specifically, we show that most PGGMs cannot relied the natural variability in graph properties observed across multiple networks because their edge generation process assumes independence among edges. Then, we propose the mixed Kronecker Product Graph Model (mKPGM) a scalable generalization of KPGMs that uses tied parameters to increase the variability of the sampled networks, while preserving the edge probabilities in expectation. We compare mKPGM to several other graph models. The results show that learned mKPGMs accurately represent the characteristics of real-world networks, while also effectively capturing the natural variability in network structure.  
  Address [Moreno, Sebastian] Univ Adolfo Ibanez, Avda Padre Hurtado 750,A-212, Vina Del Mar, Chile, Email: sebastianmoreno@uai.cl;  
  Corporate Author Thesis  
  Publisher Assoc Computing Machinery Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1556-4681 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000431790300010 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 857  
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Author Quintero-Galvis, J.F.; Paleo-Lopez, R.; Solano-Iguaran, J.J.; Poupin, M.J.; Ledger, T.; Gaitan-Espitia, J.D.; Antol, A.; Travisano, M.; Nespolo, R.F. pdf  doi
openurl 
  Title Exploring the evolution of multicellularity in Saccharomyces cerevisiae under bacteria environment: An experimental phylogenetics approach Type Journal Article
  Year 2018 Publication Ecology And Evolution Abbreviated Journal Ecol. Evol.  
  Volume 8 Issue 9 Pages 4619-4630  
  Keywords clonal multicellularity; experimental evolution; multicellularity; social multicellularity; yeasts  
  Abstract There have been over 25 independent unicellular to multicellular evolutionary transitions, which have been transformational in the complexity of life. All of these transitions likely occurred in communities numerically dominated by unicellular organisms, mostly bacteria. Hence, it is reasonable to expect that bacteria were involved in generating the ecological conditions that promoted the stability and proliferation of the first multicellular forms as protective units. In this study, we addressed this problem by analyzing the occurrence of multicellularity in an experimental phylogeny of yeasts (Sacharomyces cerevisiae) a model organism that is unicellular but can generate multicellular clusters under some conditions. We exposed a single ancestral population to periodic divergences, coevolving with a cocktail of environmental bacteria that were inoculated to the environment of the ancestor, and compared to a control (no bacteria). We quantified culturable microorganisms to the level of genera, finding up to 20 taxa (all bacteria) that competed with the yeasts during diversification. After 600 generations of coevolution, the yeasts produced two types of multicellular clusters: clonal and aggregative. Whereas clonal clusters were present in both treatments, aggregative clusters were only present under the bacteria treatment and showed significant phylogenetic signal. However, clonal clusters showed different properties if bacteria were present as follows: They were more abundant and significantly smaller than in the control. These results indicate that bacteria are important modulators of the occurrence of multicellularity, providing support to the idea that they generated the ecological conditions-promoting multicellularity.  
  Address [Quintero-Galvis, Julian F.; Paleo-Lopez, Rocio; Solano-Iguaran, Jaiber J.; Nespolo, Roberto F.] Univ Austral Chile, Inst Ciencias Ambientales & Evolut, Valdivia, Chile, Email: robertonespolorossi@gmail.com  
  Corporate Author Thesis  
  Publisher Wiley Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2045-7758 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000431987300024 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 856  
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Author Pedrouso, A.; Aiartza, I.; Morales, N.; Vazquez-Padin, J.R.; Rogalla, F.; Campos, J.L.; Mosquera-Corral, A.; del Rio, A.V. pdf  doi
openurl 
  Title Pilot-scale ELAN (R) process applied to treat primary settled urban wastewater at low temperature via partial nitritation-anammox processes Type Journal Article
  Year 2018 Publication Separation And Purification Technology Abbreviated Journal Sep. Purif. Technol.  
  Volume 200 Issue Pages 94-101  
  Keywords Ananunox; Autotrophic nitrogen removal; Granular biomass; Mainstream; Partial nitritation  
  Abstract A single stage partial nitritation and anammox granular pilot scale reactor (600 L) was operated to treat primary settled sewage in an urban wastewater treatment plant. The fed wastewater contained low total nitrogen concentrations of 6-25 mg TN/L and the system operated without temperature control ranging from 18 to 12 degrees C. A control strategy, based on the pH value, was applied to stop the aeration supply. The pH set-point was fixed at 6.0 and allowed obtaining a total nitrogen removal efficiency approximately of 50% treating a load of 67 mg TN/(L.d) without the addition of any chemicals. Although nitrite oxidizing bacteria were present in the inoculated sludge, when the pH-based control was implemented (day 30) the ammonium oxidation was favored compared to the nitrite oxidation activity. Then, the system operated stable the rest of the operational period (days 30-94) despite the presence of organic matter in the wastewater and the high variability of nitrogen load and temperature during the operation. Nitrogen was autotrophically removed accomplishing the stringent discharge limits (10 mg TN/L) and nitrate concentrations in the effluent lower than 3 mg NO3--N/L. Both biomass concentration and granules size increased during the operational period indicating the growth of the biomass inside the reactor and therefore the potential treatment capacity.  
  Address [Pedrouso, Alba; Aiartza, Irati; Mosquera-Corral, Anuska; Val del Rio, Angeles] Univ Santiago de Compostela, Sch Engn, Dept Chem Engn, E-15705 Santiago De Compostela, Spain, Email: alba.pedrouso@usc.es;  
  Corporate Author Thesis  
  Publisher Elsevier Science Bv Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1383-5866 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000431157200012 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 855  
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Author Vera, J. doi  openurl
  Title An Agent-Based Model for the Role of Short-Term Memory Enhancement in the Emergence of Grammatical Agreement Type Journal Article
  Year 2018 Publication Artificial Life Abbreviated Journal Artif. Life  
  Volume 24 Issue 2 Pages 119-127  
  Keywords Short-term memory; grammatical agreement systems; language games; language evolution  
  Abstract What is the influence of short-term memory enhancement on the emergence of grammatical agreement systems in multi-agent language games? Agreement systems suppose that at least two words share some features with each other, such as gender, number, or case. Previous work, within the multi-agent language-game framework, has recently proposed models stressing the hypothesis that the emergence of a grammatical agreement system arises from the minimization of semantic ambiguity. On the other hand, neurobiological evidence argues for the hypothesis that language evolution has mainly related to an increasing of short-term memory capacity, which has allowed the online manipulation of words and meanings participating particularly in grammatical agreement systems. Here, the main aim is to propose a multi-agent language game for the emergence of a grammatical agreement system, under measurable long-range relations depending on the short-term memory capacity. Computer simulations, based on a parameter that measures the amount of short-term memory capacity, suggest that agreement marker systems arise in a population of agents equipped at least with a critical short-term memory capacity.  
  Address [Vera, Javier] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Santiago, Chile, Email: jxvera@gmail.com  
  Corporate Author Thesis  
  Publisher Mit Press Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1064-5462 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000431302900003 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 853  
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Author Abarzua, N.; Pomareda, R.; Vega, O. pdf  doi
openurl 
  Title Feet in orthogonal-Buekenhout-Metz unitals Type Journal Article
  Year 2018 Publication Advances In Geometry Abbreviated Journal Adv. Geom.  
  Volume 18 Issue 2 Pages 229-236  
  Keywords Unitals; projective planes  
  Abstract Given an orthogonal-Buekenhout-Metz unital U-alpha,U-beta, embedded in PG(2, q(2)), and a point P is not an element of U-alpha,U-beta, we study the set tau(p)(U-alpha,U-beta) of feet of P in U-alpha,U-beta. We characterize geometrically each of these sets as either q + 1 collinear points or as q + 1 points partitioned into two arcs. Other results about the geometry of these sets are also given.  
  Address [Abarzua, N.] Univ Adolfo Ibanez, Santiago, Chile, Email: nicolas.abarzua@uai.cl;  
  Corporate Author Thesis  
  Publisher Walter De Gruyter Gmbh Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1615-715x ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000431397600007 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 852  
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Author Munoz, F.D.; Wogrin, S.; Oren, S.S.; Hobbs, B.F. pdf  doi
openurl 
  Title Economic Inefficiencies of Cost-based Electricity Market Designs Type Journal Article
  Year 2018 Publication Energy Journal Abbreviated Journal Energy J.  
  Volume 39 Issue 3 Pages 51-68  
  Keywords Electricity market design; market power; equilibrium modeling; opportunity costs  
  Abstract Some restructured power systems rely on audited cost information instead of competitive bids for the dispatch and pricing of electricity in real time, particularly in hydro systems in Latin America. Audited costs are also substituted for bids in U.S. markets when local market power is demonstrated to be present. Regulators that favor a cost-based design argue that this is more appropriate for systems with a small number of generation firms because it eliminates the possibilities for generators to behave strategically in the spot market, which is a main concern in bid-based markets. We discuss existing results on market power issues in cost- and bid-based designs and present a counterintuitive example, in which forcing spot prices to be equal to marginal costs in a concentrated market can actually yield lower social welfare than under a bid-based market design due to perverse investment incentives. Additionally, we discuss the difficulty of auditing the true opportunity costs of generators in cost- based markets and how this can lead to distorted dispatch schedules and prices, ultimately affecting the long-term economic efficiency of a system. An important example is opportunity costs that diverge from direct fuel costs due to energy or start limits, or other generator constraints. Most of these arise because of physical and financial inflexibilities that become more relevant with increasing shares of variable and unpredictable generation from renewables.  
  Address [Munoz, Francisco D.] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Santiago, Chile, Email: fdmunoz@uai.cl  
  Corporate Author Thesis  
  Publisher Int Assoc Energy Economics Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0195-6574 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000431395500003 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 851  
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Author Gallardo, L.; Barraza, F.; Ceballos, A.; Galleguillos, M.; Huneeus, N.; Lambert, F.; Ibarra, C.; Munizaga, M.; O'Ryan, R.; Osses, M.; Tolvett, S.; Urquiza, A.; Veliz, K.D. pdf  doi
openurl 
  Title Evolution of air quality in Santiago: The role of mobility and lessons from the science-policy interface Type Journal Article
  Year 2018 Publication Elementa-Science Of The Anthropocene Abbreviated Journal Elementa-Sci. Anthrop.  
  Volume 6 Issue Pages 23 pp  
  Keywords Air quality; mobility; urbanization; climate mitigation; policy-science interface; Chile  
  Abstract Worldwide, urbanization constitutes a major and growing driver of global change and a distinctive feature of the Anthropocene. Thus, urban development paths present opportunities for technological and societal transformations towards energy efficiency and decarbonization, with benefits for both greenhouse gas (GHG) and air pollution mitigation. This requires a better understanding of the intertwined dynamics of urban energy and land use, emissions, demographics, governance, and societal and biophysical processes. In this study, we address several characteristics of urbanization in Santiago (33.5 degrees S, 70.5 degrees W, 500 m a.s.l.), the capital city of Chile. Specifically, we focus on the multiple links between mobility and air quality, describe the evolution of these two aspects over the past 30 years, and review the role scientific knowledge has played in policy-making. We show evidence of how technological measures (e.g., fuel quality, three-way catalytic converters, diesel particle filters) have been successful in decreasing coarse mode aerosol (PM10) concentrations in Santiago despite increasing urbanization (e.g., population, motorization, urban sprawl). However, we also show that such measures will likely be insufficient if behavioral changes do not achieve an increase in the use of public transportation. Our investigation seeks to inform urban development in the Anthropocene, and our results may be useful for other developing countries, particularly in Latin America and the Caribbean where more than 80% of the population is urban.  
  Address [Gallardo, Laura; Barraza, Francisco; Ceballos, Andres; Galleguillos, Mauricio; Huneeus, Nicolas; Lambert, Fabrice; Ibarra, Cecilia; Munizaga, Marcela; O'Ryan, Raul; Osses, Mauricio; Tolvett, Sebastian; Urquiza, Anahi; Veliz, Karina D.] Ctr Climate & Resilience Res CR2, FONDAP15110009, Santiago, Region Metropol, Chile, Email: lgallard@u.uchile.cl  
  Corporate Author Thesis  
  Publisher Univ California Press Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2325-1026 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000431309200001 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 850  
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Author Mancilla, R.A.; Little, C.; Amoroso, A. pdf  doi
openurl 
  Title Efficient Bioconversion of High Concentration Phytosterol Microdispersion to 4-Androstene-3,17-Dione (AD) by Mycobacterium sp B3805 Type Journal Article
  Year 2018 Publication Applied Biochemistry And Biotechnology Abbreviated Journal Appl. Biochem. Biotechnol.  
  Volume 185 Issue 2 Pages 494-506  
  Keywords Bioconversion; Phytosterols; Microdispersion; AD; Steroids  
  Abstract Low solubility of sterols in aqueous media limits efficient steroid production mediated by biocatalytic microorganisms such as Mycobacterium. Sterol emulsion technologies have been developed with low success rates, largely due to the complexity of generating stable and bioavailable particles. In this study, several aqueous dispersions of sterols in-water of different particle sizes were bioconverted to 4-androstene-3,17-dione (AD) in a solvent-free environment, using a classic microorganism Mycobacterium sp. B3805 as a model system. According to our results, the high concentration (20 g/L) phytosterol dispersions with the smallest particle size tested (370 nm) achieved up to 54% (7.4 g/L) AD production yield in 11 days. Moreover, the use of 0.1 biomass/sterols ratio in a complex bioconversion media containing yeast extract, and a 1:1 glucose/microdispersion ratio in the presence of the surfactant DK-Ester P-160 (HLB16), allowed homogenization and increased microdispersion stability, thus achieving the best results using emulsion technologies to date.  
  Address [Mancilla, Rodrigo A.] Pontificia Univ Catolica Valparaiso, Fac Biochem Engn, Valparaiso 2340000, Chile, Email: rodrigo.mancilla.v@mail.pucv.cl  
  Corporate Author Thesis  
  Publisher Humana Press Inc Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0273-2289 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000431503400011 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 849  
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Author Mora-Ruiz, M.D.; Cifuentes, A.; Font-Verdera, F.; Perez-Fernandez, C.; Farias, M.E.; Gonzalez, B.; Orfila, A.; Rossello-Mora, R. pdf  doi
openurl 
  Title Biogeographical patterns of bacterial and archaeal communities from distant hypersaline environments Type Journal Article
  Year 2018 Publication Systematic And Applied Microbiology Abbreviated Journal Syst. Appl. Microbiol.  
  Volume 41 Issue 2 Pages 139-150  
  Keywords Archaea; Bacteria; Brines; Hypersaline sediments; Operational phylogenetic units; Salterns  
  Abstract Microorganisms are globally distributed but new evidence shows that the microbial structure of their communities can vary due to geographical location and environmental parameters. In this study, 50 samples including brines and sediments from Europe, Spanish-Atlantic and South America were analysed by applying the operational phylogenetic unit (OPU) approach in order to understand whether microbial community structures in hypersaline environments exhibited biogeographical patterns. The fine-tuned identification of approximately 1000 OPUs (almost equivalent to “species”) using multivariate analysis revealed regionally distinct taxa compositions. This segregation was more diffuse at the genus level and pointed to a phylogenetic and metabolic redundancy at the higher taxa level, where their different species acquired distinct advantages related to the regional physicochemical idiosyncrasies. The presence of previously undescribed groups was also shown in these environments, such as Parcubacteria, or members of Nanohaloarchaeota in anaerobic hypersaline sediments. Finally, an important OPU overlap was observed between anoxic sediments and their overlaying brines, indicating versatile metabolism for the pelagic organisms. (C) 2017 Elsevier GmbH. All rights reserved.  
  Address [Mora-Ruiz, M. del R.; Cifuentes, A.; Font-Verdera, F.; Rossello-Mora, R.] UIB CSIC, Mediterranean Inst Adv Studies IMEDEA, Dept Ecol & Marine Resources, Esporles, Spain, Email: mrmora@cookeaqua.com  
  Corporate Author Thesis  
  Publisher Elsevier Gmbh, Urban & Fischer Verlag Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0723-2020 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000429913300009 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 848  
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Author Crutchik, D.; Rodrigues, S.; Ruddle, D.; Garrido, J.M. pdf  doi
openurl 
  Title Evaluation of a low-cost magnesium product for phosphorus recovery by struvite crystallization Type Journal Article
  Year 2018 Publication Journal Of Chemical Technology And Biotechnology Abbreviated Journal J. Chem. Technol. Biotechnol.  
  Volume 93 Issue 4 Pages 1012-1021  
  Keywords continuous stirred tank reactor; fluidized bed reactor; industrial magnesium hydroxide; phosphorus recovery; struvite  
  Abstract BACKGROUND: The development of a cost-effective process of struvite crystallization requires the selection of appropriate sources of alkali and magnesium. In this study, the effectiveness of two industrial grade products, MgO and Mg(OH)(2), as magnesium and alkali sources to recover phosphorus as struvite were investigated and compared in a first set of experiments. Subsequently, the use of industrial Mg(OH)(2) was compared in two different struvite crystallization systems, an upflow fluidized bed reactor (FBR) and a continuous stirred tank reactor (CSTR) coupled to a settler tank. RESULTS: At the same operational conditions, the consumption of MgO was higher than Mg(OH)(2) consumption. Moreover, industrial Mg(OH)(2) consumption for FBR and the CSTR operation was 1.6 and 1.1 1 mol Mg added mol(-1) P precipitated, respectively. This difference was caused by the high mixing intensity and the higher contact time between the Mg(OH)(2) slurry and the influent in the CSTR, favouring the conversion. CONCLUSIONS: Both industrial grade magnesium products are promising options for struvite crystallization. However, Mg(OH)(2) was more effective than the starting material, MgO, to recover phosphorus. Struvite crystallization by adding an industrial grade Mg(OH)(2) could be economically viable with regard to alternative physico-chemical P removal processes using metal salts, increasing the attractiveness of this P recovery process. (C) 2017 Society of Chemical Industry.  
  Address [Crutchik, Dafne] Univ Adolfo Ibanez, Fac Engn & Sci, Diagonal Las Torres 2640, Santiago, Chile, Email: dafne.crutchik@uai.cl  
  Corporate Author Thesis  
  Publisher Wiley Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0268-2575 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000426859900010 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 847  
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Author Borquez-Paredes, D.; Beghelli, A.; Leiva, A.; Murrugarra, R. pdf  doi
openurl 
  Title Does fragmentation avoidance improve the performance of dynamic spectrum allocation in elastic optical networks? Type Journal Article
  Year 2018 Publication Photonic Network Communications Abbreviated Journal Photonic Netw. Commun.  
  Volume 35 Issue 3 Pages 287-299  
  Keywords Flexible grid optical networks; Greedy algorithm; Deadlock avoidance; Fragmentation  
  Abstract Most spectrum allocation algorithms in elastic optical networks apply a greedy approach: A new connection is allocated as long as there are enough spectrum slots to accommodate it. Recently, a different approach was proposed. Named Deadlock-Avoidance (DA), it only establishes a new connection if the portion of spectrum left after allocating it is zero (full-link utilization) or is big enough to accommodate future requests. Otherwise, the connection request is blocked as a way to avoid fragmentation. The performance of DA has been evaluated in a single-link scenario, where its performance is not affected by the slot continuity constraint. In this paper, we evaluate for the first time the blocking performance and fragmentation level of DA in a fully dynamic network scenario with different bitrates and number of slots for a single link, a 4-node bus and a mesh topology. The performance was evaluated by simulation, and a lower bound was also derived using a continuous Markov chain model. Results are obtained for DA and three greedy algorithms: First Fit, Exact Fit and First-Last Fit. Results show that DA significantly decreases fragmentation, and thus, it exhibits a much lower blocking due to fragmentation than the greedy algorithms. However, this decrease is compensated by a new type of blocking due to the selective acceptance of connections. As a result, the extra computational complexity of DA does not compensate a gain in performance.  
  Address [Borquez-Paredes, Danilo; Beghelli, Alejandra; Murrugarra, Ruth] Univ Adolfo Ibanez, Fac Engn & Sci, Campus Vina del Mar, Vina Del Mar, Chile, Email: danilo.borquez@edu.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 1387-974x ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000430478400001 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 846  
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Author Concha, A.; Aguayo, D.; Mellado, P. doi  openurl
  Title Designing Hysteresis with Dipolar Chains Type Journal Article
  Year 2018 Publication Physical Review Letters Abbreviated Journal Phys. Rev. Lett.  
  Volume 120 Issue 15 Pages 5 pp  
  Keywords  
  Abstract Materials that have hysteretic response to an external field are essential in modern information storage and processing technologies. A myriad of magnetization curves of several natural and artificial materials have previously been measured and each has found a particular mechanism that accounts for it. However, a phenomenological model that captures all the hysteresis loops and at the same time provides a simple way to design the magnetic response of a material while remaining minimal is missing. Here, we propose and experimentally demonstrate an elementary method to engineer hysteresis loops in metamaterials built out of dipolar chains. We show that by tuning the interactions of the system and its geometry we can shape the hysteresis loop which allows for the design of the softness of a magnetic material at will. Additionally, this mechanism allows for the control of the number of loops aimed to realize multiple-valued logic technologies. Our findings pave the way for the rational design of hysteretical responses in a variety of physical systems such as dipolar cold atoms, ferroelectrics, or artificial magnetic lattices, among others.  
  Address [Concha, Andres; Aguayo, David; Mellado, Paula] Condensed Matter I Lab, Diagonal Torres 2640,Bldg D, Santiago 7941169, Chile, Email: aconcha93@gmail.com;  
  Corporate Author Thesis  
  Publisher Amer Physical Soc Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0031-9007 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000429637100008 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 845  
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