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Author Araya-Letelier, G.; Antico, F.C.; Carrasco, M.; Rojas, P.; García-Herrera, C.M. pdf  doi
openurl 
  Title Effectiveness of new natural fibers on damage-mechanical performance of mortar Type Journal Article
  Year 2017 Publication Construction and Building Materials Abbreviated Journal Constr. Build. Mater.  
  Volume 152 Issue Pages 672-682  
  Keywords Animal fiber; Fiber-reinforced mortar; Mechanical properties; Damage mitigation  
  Abstract Abstract

Addition of fibers to cement-based materials improve tensile and flexural strength, fracture toughness, abrasion resistance, delay cracking, and reduce crack widths. Natural fibers have recently become more popular in the construction materials community. This investigation addresses the characterization of a new animal fiber (pig hair), a massive food-industry waste worldwide, and its use in mortars. Morphological, physical and mechanical properties of pig hair are determined in order to be used as reinforcement in mortars. A sensitivity analysis on the volumes of fiber in mortars is developed. The results from this investigation showed that reinforced mortars significantly improve impact strength, abrasion resistance, plastic shrinkage cracking, age at cracking, and crack widths as fiber volume increases. Other properties such as compressive and flexural strength, density, porosity and modulus of elasticity of reinforced mortars are not significantly affected by the addition of pig hair.
 
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0950-0618 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 727  
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Author Caceres, C.; Moffat, R.; Pakalnis, R. pdf  doi
openurl 
  Title Evaluation of flexural failure of sill mats using classical beam theory and numerical models Type Journal Article
  Year 2017 Publication International Journal of Rock Mechanics and Mining Sciences Abbreviated Journal Int. J. Rock Mech. Min. Sci.  
  Volume 99 Issue Supplement C Pages 21-27  
  Keywords Sill mat; Numerical model; Mining; Flexural failure  
  Abstract  
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  Corporate Author Thesis  
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  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1365-1609 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 764  
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Author During, G.; Josserand, C.; Rica, S. pdf  doi
openurl 
  Title Self-similar formation of an inverse cascade in vibrating elastic plates Type Journal Article
  Year 2015 Publication Physical Review E Abbreviated Journal Phys. Rev. E  
  Volume 91 Issue 5 Pages 10 pp  
  Keywords  
  Abstract The dynamics of random weakly nonlinear waves is studied in the framework of vibrating thin elastic plates. Although it has been previously predicted that no stationary inverse cascade of constant wave action flux could exist in the framework of wave turbulence for elastic plates, we present substantial evidence of the existence of a time-dependent inverse cascade, opening up the possibility of self-organization for a larger class of systems. This inverse cascade transports the spectral density of the amplitude of the waves from short up to large scales, increasing the distribution of long waves despite the short-wave fluctuations. This dynamics appears to be self-similar and possesses a power-law behavior in the short-wavelength limit which significantly differs from the exponent obtained via a Kolmogorov dimensional analysis argument. Finally, we show explicitly a tendency to build a long-wave coherent structure in finite time.  
  Address [Duering, Gustavo] Pontificia Univ Catolica Chile, Fac Fis, Santiago, Chile  
  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 2470-0045 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000354983600007 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 493  
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Author Goles, C.; Dumais, J.; Douady, S. pdf  doi
openurl 
  Title Fibonacci or quasi-symmetric phyllotaxis. Part I: why? Type Journal Article
  Year 2016 Publication Acta Societatis Botanicorum Poloniae Abbreviated Journal Acta Soc. Bot. Pol.  
  Volume 85 Issue 4 Pages 34 pp  
  Keywords phyllotaxis; Fibonacci; quasi-symmetry; disc-stacking model; irregular pattern  
  Abstract The study of phyllotaxis has focused on seeking explanations for the occurrence of consecutive Fibonacci numbers in the number of helices paving the stems of plants in the two opposite directions. Using the disk-accretion model, first introduced by Schwendener and justified by modern biological studies, we observe two distinct types of solutions: the classical Fibonacci-like ones, and also more irregular configurations exhibiting nearly equal number of helices in a quasi-square packing, the quasi-symmetric ones, which are a generalization of the whorled patterns. Defining new geometric tools allowing to work with irregular patterns and local transitions, we provide simple explanations for the emergence of these two states within the same elementary model. A companion paper will provide a wide array of plant data analyses that support our view.  
  Address [Gole, Christophe] Smith Coll, Dept Math, Northampton, MA 01063 USA, Email: cgole@smith.edu  
  Corporate Author Thesis  
  Publisher Polskie Towarzystwo Botaniczne Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0001-6977 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000392930700006 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 694  
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Author Hojman, S.A.; Asenjo, F.A. pdf  doi
openurl 
  Title Supersymmetric Majorana quantum cosmologies Type Journal Article
  Year 2015 Publication Physical Review D Abbreviated Journal Phys. Rev. D  
  Volume 92 Issue 8 Pages 7 pp  
  Keywords  
  Abstract The Einstein equations for an isotropic and homogeneous Friedmann-Robertson-Walker universe in the presence of a quintessence scalar field are shown to be described in a compact way, formally identical to the dynamics of a relativistic particle moving on a two-dimensional spacetime. The correct Lagrangian for the system is presented and used to construct a spinor quantum cosmology theory using Breit's prescription. The theory is supersymmetric when written in the Majorana representation. The spinor field components interact through a potential that correlates the spacetime metric and the quintessence. An exact supersymmetric solution for k = 0 case is exhibited. This quantum cosmology model may be interpreted as a theory of interacting universes.  
  Address [Hojman, Sergio A.] Univ Adolfo Ibanez, Dept Ciencias, Fac Artes Liberales, Santiago 7941169, Chile, Email: sergio.hojman@uai.cl;  
  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 2470-0010 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000362901900005 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 544  
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Author Kong, Q.; Mondschein, S.; Pereira, A. openurl 
  Title Effectiveness of Breast Cancer Screening Policies in Countries with Medium-Low Incidence Type Journal Article
  Year 2017 Publication Revista de Saúde Pública Abbreviated Journal Rev. Saude Publ.  
  Volume to appear Issue Pages  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0034-8910 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 690  
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Author Ljubic, I.; Moreno, E. doi  openurl
  Title Outer approximation and submodular cuts for maximum capture facility location problems with random utilities Type Journal Article
  Year 2017 Publication European Journal Of Operational Research Abbreviated Journal Eur. J. Oper. Res.  
  Volume to appear Issue Pages  
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  Series Volume Series Issue Edition  
  ISSN 0377-2217 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 762  
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Author McFadden, M.; Loconsole, J.; Schockling, A.J.; Nerenberg, R.; Pavissich, J.P. pdf  doi
openurl 
  Title Comparing peracetic acid and hypochlorite for disinfection of combined sewer overflows: Effects of suspended-solids and pH Type Journal Article
  Year 2017 Publication Science of The Total Environment Abbreviated Journal Sci. Total Environ.  
  Volume 599 Issue Supplement C Pages 533-539  
  Keywords Paa; Chlorine; Combined sewer overflows; Suspended solids; Disinfection  
  Abstract Abstract

Peracetic acid (PAA) is an alternative disinfectant that may be effective for combined sewer overflow (CSO) disinfection, but little is known about the effect of particle size on PAA disinfection efficiency. In this work, PAA and hypochlorite were compared as disinfectants, with a focus on the effect of wastewater particles. Inactivation experiments were conducted on suspended cultures of Escherichia coli and wastewater suspended solids. Tested size fractions included particle diameters <10μm, <100μm, and raw wastewater. Chlorine disinfection efficiency decreased with increasing solids size. However, solids size had little effect on PAA disinfection. The PAA disinfection efficiency decreased at pH values above 7.5. Live/dead staining revealed that PAA disinfection leaves most cells in a viable but non-culturable condition. Fourier transform infrared spectroscopy (FTIR) analyses suggests that PAA and hypochlorite may inactivate E. coli bacteria by similar mechanisms.
 
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  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0048-9697 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 765  
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Author Mellado, P.; Petrova, O.; Tchernyshyov, O. pdf  doi
openurl 
  Title Projective symmetry of partons in the Kitaev honeycomb model Type Journal Article
  Year 2015 Publication Physical Review B Abbreviated Journal Phys. Rev. B  
  Volume 91 Issue 4 Pages 4 pp  
  Keywords  
  Abstract Low-energy states of quantum spin liquids are thought to involve partons living in a gauge-field background. We study the spectrum of Majorana fermions of the Kitaev honeycomb model on spherical clusters. The gauge field endows the partons with half-integer orbital angular momenta. As a consequence, the multiplicities do not reflect the point-group symmetries of the cluster, but rather its projective symmetries, operations combining physical and gauge transformations. The projective symmetry group of the ground state is the double cover of the point group.  
  Address [Mellado, Paula] Adolfo Ibanez Univ, Sch Engn & Appl Sci, Santiago, Chile  
  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 2469-9950 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000348568700001 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 446  
Permanent link to this record
 

 
Author Muñoz, G.; Espinoza, D.; Goycoolea, M.; Moreno, E.; Queyranne, M.; Rivera, O. doi  openurl
  Title A study of the Bienstock-Zuckerberg algorithm, Applications in Mining and Resource Constrained Project Scheduling Type Journal Article
  Year 2017 Publication Computational Optimization And Applications Abbreviated Journal Comput. Optim. Appl.  
  Volume to appear Issue Pages  
  Keywords  
  Abstract We study a Lagrangian decomposition algorithm recently proposed by Dan Bienstock and Mark Zuckerberg for solving the LP relaxation of a class of open pit mine project scheduling problems. In this study we show that the Bienstock-Zuckerberg (BZ) algorithm can be used to solve LP relaxations corresponding to a much broader class of scheduling problems, including the well-known Resource Constrained Project Scheduling Problem (RCPSP), and multi-modal variants of the RCPSP that consider batch processing of jobs. We present a new, intuitive proof of correctness for the BZ algorithm that works by casting the BZ algorithm as a column generation algorithm. This analysis allows us to draw parallels with the well-known Dantzig-Wolfe (DW) algorithm. We discuss practical computational techniques for speeding up the performance of the BZ and DW algorithms on project scheduling problems. Finally, we present computational experiments independently testing the effectiveness of the BZ and DW algorithms on different sets of publicly available test instances. Our computational experiments confirm that the BZ algorithm significantly outperforms the DW algorithm for the problems considered. Our computational experiments also show that the proposed speed-up techniques can have a significant impact on solution time. We provide some insights on what might be explaining this significant difference in performance.  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0926-6003 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 763  
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Author Petrova, O.; Mellado, P.; Tchernyshyov, O. pdf  doi
openurl 
  Title Unpaired Majorana modes in the gapped phase of Kitaev's honeycomb model Type Journal Article
  Year 2013 Publication Physical Review B Abbreviated Journal Phys. Rev. B  
  Volume 88 Issue 14 Pages 4 pp  
  Keywords  
  Abstract We study the gapped phase of Kitaev's honeycomb model (a Z(2) spin liquid) in the presence of lattice defects. We find that some dislocations and bond defects carry unpaired Majorana fermions. Physical excitations associated with these defects are (complex) fermion modes made out of two (real) Majorana fermions connected by a Z(2) gauge string. The quantum state of these modes is robust against local noise and can be changed by winding a Z(2) vortex around a dislocation. The exact solution respects gauge invariance and reveals a crucial role of the gauge field in the physics of Majorana modes.  
  Address [Petrova, Olga; Tchernyshyov, Oleg] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA  
  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 2469-9950 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000325556900001 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 317  
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Author Petrova, O.; Mellado, P.; Tchernyshyov, O. pdf  doi
openurl 
  Title Unpaired Majorana modes on dislocations and string defects in Kitaev's honeycomb model Type Journal Article
  Year 2014 Publication Physical Review B Abbreviated Journal Phys. Rev. B  
  Volume 90 Issue 13 Pages 14 pp  
  Keywords  
  Abstract We study the gapped phase of Kitaev's honeycomb model (a Z(2) spin liquid) on a lattice with topological defects. We find that some dislocations and string defects carry unpaired Majorana fermions. Physical excitations associated with these defects are (complex) fermion modes made out of two (real) Majorana fermions connected by a Z(2) gauge string. The quantum state of these modes is robust against local noise and can be changed by winding a Z(2) vortex around one of the dislocations. The exact solution respects gauge invariance and reveals a crucial role of the gauge field in the physics of Majorana modes. To facilitate these theoretical developments, we recast the degenerate perturbation theory for spins in the language of Majorana fermions.  
  Address [Petrova, Olga] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany  
  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 2469-9950 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000342794300003 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 417  
Permanent link to this record
 

 
Author Rodríguez-Valdecantos, G.; Manzano, M.; Sánchez, R.; Urbina, F.; Hengst, M.B.; Lardies, M.A.; Ruz, G.A.; González, B. pdf  doi
openurl 
  Title Early successional patterns of bacterial communities in soil microcosms reveal changes in bacterial community composition and network architecture, depending on the successional condition Type Journal Article
  Year 2017 Publication Applied Soil Ecology Abbreviated Journal Appl. Soil Ecol.  
  Volume 120 Issue Pages 44-54  
  Keywords 2,4-D Herbicide; Bacterial successional dynamics; Cycloheximide; Environmental perturbations; Soil colonization; Soil microcosms  
  Abstract Soil ecosystem dynamics are influenced by the composition of bacterial communities and environmental conditions. A common approach to study bacterial successional dynamics is to survey the trajectories and patterns that follow bacterial community assemblages; however early successional stages have received little attention. To elucidate how soil type and chemical amendments influence both the trajectories that follow early compositional changes and the architecture of the community bacterial networks in soil bacterial succession, a time series experiment of soil microcosm experiments was performed. Soil bacterial communities were initially perturbed by dilution and subsequently subjected to three amendments: application of the pesticide 2,4-dichlorophenoxyacetic acid, as a pesticide-amended succession; application of cycloheximide, an inhibitor affecting primarily eukaryotic microorganisms, as a eukaryotic-inhibition bacterial succession; or application of sterile water as a non-perturbed control. Terminal restriction fragment length polymorphism (T-RFLP) analysis of the 16S rRNA gene isolated from soil microcosms was used to generate bacterial relative abundance datasets. Bray-Curtis similarity and beta diversity partition-based methods were applied to identify the trajectories that follow changes in bacterial community composition. Results demonstrated that bacterial communities exposed to these three conditions rapidly differentiated from the starting point (less than 12h), followed different compositional change trajectories depending on the treatment, and quickly converged to a state similar to the initial community (48-72h). Network inference analysis was applied using a generalized Lotka-Volterra model to provide an overview of bacterial OTU interactions and to follow the changes in bacterial community networks. This analysis revealed that antagonistic interactions increased when eukaryotes were inhibited, whereas cooperative interactions increased under pesticide influence. Moreover, central OTUs from soil bacterial community networks were also persistent OTUs, thus confirming the existence of a core bacterial community and that these same OTUs could plastically interact according to the perturbation type to quickly stabilize bacterial communities undergoing succession.  
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  Corporate Author Thesis  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0929-1393 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 749  
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Author Vargas, I.T.; Fischer, D.A.; Alsina, M.A.; Pavissich, J.P.; Pasten, P.A.; Pizarro, G.E. pdf  doi
openurl 
  Title Copper Corrosion and Biocorrosion Events in Premise Plumbing Type Journal Article
  Year 2017 Publication Materials Abbreviated Journal Materials  
  Volume 10 Issue 9 Pages 1036  
  Keywords  
  Abstract Corrosion of copper pipes may release high amounts of copper into the water, exceeding the maximum concentration of copper for drinking water standards. Typically, the events with the highest release of copper into drinking water are related to the presence of biofilms. This article reviews this phenomenon, focusing on copper ingestion and its health impacts, the physicochemical mechanisms and the microbial involvement on copper release, the techniques used to describe and understand this phenomenon, and the hydrodynamic effects. A conceptual model is proposed and the mathematical models are reviewed.  
  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 1996-1944 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 766  
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