ArayaLetelier, G., Antico, F. C., Carrasco, M., Rojas, P., & GarcíaHerrera, C. M. (2017). Effectiveness of new natural fibers on damagemechanical performance of mortar. Constr. Build. Mater., 152, 672–682.
Abstract: Abstract
Addition of fibers to cementbased 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 foodindustry 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.

Caceres, C., Moffat, R., & Pakalnis, R. (2017). Evaluation of flexural failure of sill mats using classical beam theory and numerical models. Int. J. Rock Mech. Min. Sci., 99(Supplement C), 21–27.

During, G., Josserand, C., & Rica, S. (2015). Selfsimilar formation of an inverse cascade in vibrating elastic plates. Phys. Rev. E, 91(5), 10 pp.
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 timedependent inverse cascade, opening up the possibility of selforganization 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 shortwave fluctuations. This dynamics appears to be selfsimilar and possesses a powerlaw behavior in the shortwavelength limit which significantly differs from the exponent obtained via a Kolmogorov dimensional analysis argument. Finally, we show explicitly a tendency to build a longwave coherent structure in finite time.

Goles, C., Dumais, J., & Douady, S. (2016). Fibonacci or quasisymmetric phyllotaxis. Part I: why? Acta Soc. Bot. Pol., 85(4), 34 pp.
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 diskaccretion model, first introduced by Schwendener and justified by modern biological studies, we observe two distinct types of solutions: the classical Fibonaccilike ones, and also more irregular configurations exhibiting nearly equal number of helices in a quasisquare packing, the quasisymmetric 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.

Hojman, S. A., & Asenjo, F. A. (2015). Supersymmetric Majorana quantum cosmologies. Phys. Rev. D, 92(8), 7 pp.
Abstract: The Einstein equations for an isotropic and homogeneous FriedmannRobertsonWalker 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 twodimensional 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.

Kong, Q., Mondschein, S., & Pereira, A. (2017). Effectiveness of Breast Cancer Screening Policies in Countries with MediumLow Incidence. Rev. Saude Publ., to appear.

Ljubic, I., & Moreno, E. (2017). Outer approximation and submodular cuts for maximum capture facility location problems with random utilities. Eur. J. Oper. Res., to appear.

McFadden, M., Loconsole, J., Schockling, A. J., Nerenberg, R., & Pavissich, J. P. (2017). Comparing peracetic acid and hypochlorite for disinfection of combined sewer overflows: Effects of suspendedsolids and pH. Sci. Total Environ., 599(Supplement C), 533–539.
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 nonculturable condition. Fourier transform infrared spectroscopy (FTIR) analyses suggests that PAA and hypochlorite may inactivate E. coli bacteria by similar mechanisms.

Mellado, P., Petrova, O., & Tchernyshyov, O. (2015). Projective symmetry of partons in the Kitaev honeycomb model. Phys. Rev. B, 91(4), 4 pp.
Abstract: Lowenergy states of quantum spin liquids are thought to involve partons living in a gaugefield background. We study the spectrum of Majorana fermions of the Kitaev honeycomb model on spherical clusters. The gauge field endows the partons with halfinteger orbital angular momenta. As a consequence, the multiplicities do not reflect the pointgroup 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.

Muñoz, G., Espinoza, D., Goycoolea, M., Moreno, E., Queyranne, M., & Rivera, O. (2017). A study of the BienstockZuckerberg algorithm, Applications in Mining and Resource Constrained Project Scheduling. Comput. Optim. Appl., to appear.
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 BienstockZuckerberg (BZ) algorithm can be used to solve LP relaxations corresponding to a much broader class of scheduling problems, including the wellknown Resource Constrained Project Scheduling Problem (RCPSP), and multimodal 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 wellknown DantzigWolfe (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 speedup techniques can have a significant impact on solution time. We provide some insights on what might be explaining this significant difference in performance.

Petrova, O., Mellado, P., & Tchernyshyov, O. (2013). Unpaired Majorana modes in the gapped phase of Kitaev's honeycomb model. Phys. Rev. B, 88(14), 4 pp.
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.

Petrova, O., Mellado, P., & Tchernyshyov, O. (2014). Unpaired Majorana modes on dislocations and string defects in Kitaev's honeycomb model. Phys. Rev. B, 90(13), 14 pp.
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.

RodríguezValdecantos, G., Manzano, M., Sánchez, R., Urbina, F., Hengst, M. B., Lardies, M. A., et al. (2017). Early successional patterns of bacterial communities in soil microcosms reveal changes in bacterial community composition and network architecture, depending on the successional condition. Appl. Soil Ecol., 120, 44–54.
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 2,4dichlorophenoxyacetic acid, as a pesticideamended succession; application of cycloheximide, an inhibitor affecting primarily eukaryotic microorganisms, as a eukaryoticinhibition bacterial succession; or application of sterile water as a nonperturbed control. Terminal restriction fragment length polymorphism (TRFLP) analysis of the 16S rRNA gene isolated from soil microcosms was used to generate bacterial relative abundance datasets. BrayCurtis similarity and beta diversity partitionbased 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 (4872h). Network inference analysis was applied using a generalized LotkaVolterra 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.

Vargas, I. T., Fischer, D. A., Alsina, M. A., Pavissich, J. P., Pasten, P. A., & Pizarro, G. E. (2017). Copper Corrosion and Biocorrosion Events in Premise Plumbing. Materials, 10(9), 1036.
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.
