2,693 research outputs found
Relevance and social responsibility of sustainable university organizations: analysis from the perspective of endogenous capacities
The university social relevance is the effective management of the academic functions in a committed way, from which it analyzes, studies, and investigates the problems, needs, requirements of the social environment to identify, characterize, rank them. And a model social action to the research, teaching, extension, and training of professionals, consistent with social needs, linked to the realities of the various contexts of human performance that neo university organizations, rescuing sustainability with human development and socioeconomic, involving the creative potentials and indigenous innovations of society. To coexistence between community and university in favor of endogenous growth is required, conceived as the leverage from the social and organizational strengths of the human conglomerate in reference, which promote; quality of life and sustainable human progress. Consequently, the purpose of this dissertation is limited to carrying out an analysis of the relevance and social responsibility of sustainable university organizations from the endogenous perspective. From the qualitative, interpretive, and hermeneutical paradigm, the categories of analysis are reviewed, to conclude; that the university theoretically approaches endogenous development. However, it is necessary to generate links of structural-organizational configuration within the educational institutions that involve processes related to their sustainability over time and their impacts
Vesicle formation induced by thermal fluctuations
The process of fission and vesicle formation depends on the geometry of the
membrane that will split. For instance, a flat surface finds it difficult to
form vesicles because of the lack of curved regions where to start the process.
Here we show that vesicle formation can be promoted by temperature, by using a
membrane phase field model with Gaussian curvature. We find a phase transition
between fluctuating and vesiculation phases that depends on temperature,
spontaneous curvature, and the ratio between bending and Gaussian moduli. We
analysed the energy dynamical behaviour of these processes and found that the
main driving ingredient is the Gaussian energy term, although the curvature
energy term usually helps with the process as well. We also found that the
chemical potential can be used to investigate the temperature of the system.
Finally we address how temperature changes the condition for spontaneous
vesiculation for all geometries, making it happen in a wider range of values of
the Gaussian modulus.Comment: 31 pages, 10 figure
Techno-economic evaluation of a grid-connected hybrid PV-wind power generation system in San Luis Potosi, Mexico
This paper presents a study of the installation of a hybrid PV-Wind power generation system for social interest houses in the city of San Luis Potosi, Mexico. To assess the benefits of the implementation of this type of systems, a technological, economic and environmental evaluation is carried out based on the available renewable energy resources and considering a typical load profile of consumers. The obtained results show the feasibility of installation of small capacity hybrid generation systems in the city, however governmental incentives must be implemented to make more attractive and affordable the proposed systems for medium/low income users
Long-distance dimension-eight operators in B_K
Besides their appearance at short distances \gtrsim 1/M_W, local
dimension-eight operators also contribute to kaon matrix elements at long
distances of order \gtrsim 1/mu_ope, where mu_ope is the scale controlling the
Operator Product Expansion in pure QCD, without weak interactions. This comes
about in the matching condition between the effective quark Lagrangian and the
Chiral Lagrangian of mesons. Working in dimensional regularization and in a
framework where these effects can be systematically studied, we calculate the
correction from these long-distance dimension-eight operators to the
renormalization group invariant B_K factor of K^0-K^0bar mixing, to
next-to-leading order in the 1/Nc expansion and in the chiral limit. The
correction is controlled by the matrix element <0|\bar s_L \tilde{G}_{mu
nu}gamma^mu d_L|K^0>, is small, and lowers B_K.Comment: 14 pages, LaTeX. Explanatory comments added to match version in
journa
One-step, low temperature synthesis of reduced graphene oxide decorated with ZnO nanocrystals using galvanized iron steel scrap
Walls talk: Microbial biogeography of homes spanning urbanization.
Westernization has propelled changes in urbanization and architecture, altering our exposure to the outdoor environment from that experienced during most of human evolution. These changes might affect the developmental exposure of infants to bacteria, immune development, and human microbiome diversity. Contemporary urban humans spend most of their time indoors, and little is known about the microbes associated with different designs of the built environment and their interaction with the human immune system. This study addresses the associations between architectural design and the microbial biogeography of households across a gradient of urbanization in South America. Urbanization was associated with households' increased isolation from outdoor environments, with additional indoor space isolation by walls. Microbes from house walls and floors segregate by location, and urban indoor walls contain human bacterial markers of space use. Urbanized spaces uniquely increase the content of human-associated microbes-which could increase transmission of potential pathogens-and decrease exposure to the environmental microbes with which humans have coevolved
Silver-enriched ZnO:Ag thin films deposited by magnetron co-sputtering: Post annealing effects on structural and physical properties
The ZnO semiconductor is probably among the most mentioned compounds in the scientific literature during the last decade, which is mainly due to its wide spectrum of applications. Compounds based on ZnO (in doped or composite form) are of great relevance for the development of high-tech devices. In this work, we present the growth and characterization of samples deposited by DC Magnetron co-sputtering from two pure Zn and Ag targets in an O2 / Ar atmosphere. The samples were characterized as deposited and after an annealing treatment in a reducing atmosphere. We have used XRD, RBS, ellipsometry, UV visible photoluminescence, and electrical measurements for sample characterization. The results revealed the amorphization of ZnO when the Ag content increases and, after annealing, a mixture of crystalline phases was detected for the samples with higher Ag content. It is also demonstrated the strong effect of the presence of Ag atoms in the stimulated optical and electrical responses from ZnO:Ag compounds obtained in this wor
Deletion of the E3-6.7K/gp19K region reduces the persistence of wild-type adenovirus in a permissive tumor model in Syrian hamsters
Modeling Pathogenic Mutations of Human Twinkle in Drosophila Suggests an Apoptosis Role in Response to Mitochondrial Defects
The human gene C10orf2 encodes the mitochondrial replicative DNA helicase Twinkle, mutations of which are responsible for a significant fraction of cases of autosomal dominant progressive external ophthalmoplegia (adPEO), a human mitochondrial disease caused by defects in intergenomic communication. We report the analysis of orthologous mutations in the Drosophila melanogaster mitochondrial DNA (mtDNA) helicase gene, d-mtDNA helicase. Increased expression of wild type d-mtDNA helicase using the UAS-GAL4 system leads to an increase in mtDNA copy number throughout adult life without any noteworthy phenotype, whereas overexpression of d-mtDNA helicase containing the K388A mutation in the helicase active site results in a severe depletion of mtDNA and a lethal phenotype. Overexpression of two d-mtDNA helicase variants equivalent to two human adPEO mutations shows differential effects. The A442P mutation exhibits a dominant negative effect similar to that of the active site mutant. In contrast, overexpression of d-mtDNA helicase containing the W441C mutation results in a slight decrease in mtDNA copy number during the third instar larval stage, and a moderate decrease in life span in the adult population. Overexpression of d-mtDNA helicase containing either the K388A or A442P mutations causes a mitochondrial oxidative phosphorylation (OXPHOS) defect that significantly reduces cell proliferation. The mitochondrial impairment caused by these mutations promotes apoptosis, arguing that mitochondria regulate programmed cell death in Drosophila. Our study of d-mtDNA helicase overexpression provides a tractable Drosophila model for understanding the cellular and molecular effects of human adPEO mutations
The SU(3) spin chain sigma model and string theory
The ferromagnetic integrable SU(3) spin chain provides the one loop anomalous
dimension of single trace operators involving the three complex scalars of N=4
supersymmetric Yang-Mills. We construct the non-linear sigma model describing
the continuum limit of the SU(3) spin chain. We find that this sigma model
corresponds to a string moving with large angular momentum in the five-sphere
in AdS_5xS^5. The energy and spectrum of fluctuations for rotating circular
strings with angular momenta along three orthogonal directions of the
five-sphere is reproduced as a particular case from the spin chain sigma model.Comment: 14 pages. Latex.v2: Misprints corrected. v3: Minor changes and
improved details from journal versio
- …