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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 Volume Series Issue Edition  
  ISSN 0950-0618 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 727  
Permanent link to this record
 

 
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 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 Volume Series Issue Edition  
  ISSN 0034-8910 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 690  
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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  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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