Metric of a Slow Rotating Body with Quadrupole Moment from the Erez-Rosen Metric

A metric representing a slowly rotating object with quadrupole moment is obtained using a perturbation method to include rotation into the weak limit of the Erez-Rosen metric. This metric is intended to tackle relativistic astrometry and gravitational lensing problems in which a quadrupole moment has to be taken into account

Comparative analysis of the immune responses induced by native versus recombinant versions of the ASP-based vaccine against the bovine intestinal parasite Cooperia oncophora

The protective capacities of a native double-domain activation-associated secreted protein (ndd-ASP)-based vaccine against the cattle intestinal nematode Cooperia oncophora has previously been demonstrated. However, protection analysis upon vaccination with a recombinantly produced antigen has never been performed. Therefore, the aim of the current study was to test the protective potential of a Pichia-produced double-domain ASP (pdd-ASP)-based vaccine against C. oncophora. Additionally, we aimed to compare the cellular and humoral mechanisms underlying the vaccine-induced responses by the native (ndd-ASP) and recombinant vaccines. Immunisation of cattle with the native C. oncophora vaccine conferred significant levels of protection after an experimental challenge infection, whereas the recombinant vaccine did not. Moreover, vaccination with ndd-ASP resulted in a higher proliferation of CD4-T cells both systemically and in the small intestinal mucosa when compared with animals vaccinated with the recombinant antigen. In terms of humoral response, although both native and recombinant vaccines induced similar levels of antibodies, animals vaccinated with the native vaccine were able to raise antibodies with greater specificity towards ndd-ASP in comparison with antibodies raised by vaccination with the recombinant vaccine, suggesting a differential immune recognition towards the ndd-ASP and pdd-ASP. Finally, the observation that animals displaying antibodies with higher percentages of recognition towards ndd-ASP also exhibited the lowest egg counts suggests a potential relationship between antibody specificity and protection

Contratación y comunicación: variables estratégicas en la gestión del capital humano en las pymes

El presente capítulo pretende mostrar un poco más del papel que juega la comunicación, no como simple herramienta, sino como verdadero elemento dinamizador y generador de cultura organizacional. Para poder entender dicho papel, es preciso aceptar que la principal finalidad de toda organización es la de lograr una rentabilidad económica, aunque modernamente dicha finalidad se debe ver complementada con el concepto de bienestar, tanto para aquellos agentes o elementos internos a la organización, como para los que, sin restar su importancia, se encuentran en una esfera externa a la misma. Es así como para poder llegar al logro de ambas finalidades aparece la cultura organizacional como una eficiente herramienta en su consecución, pues no es fácil pensar en una organización que logre entregar una plusvalía, tanto a sus agentes como a su producción, sin contar con unas bases organizacionales fuertemente cohesionadas y dinamizadas con un elemento cultural propio a sus orígenes, estructura e historia. Ahora bien, en dicho contexto se hace necesario destacar el importante rol que cumple la comunicación, al permitir que se cumplan las diferentes funciones de los sujetos que interactúan en dicho marco de una manera armónica y competitiva

Analysis of a mathematical model. Opportunities for the training of food engineering students

nternational research has revealed different roles of mathematics in the practices of engineers and some implications of mathematics teaching for engineering students. Modeling and mathematical models have proven to be valuable tools for their professional work and for their teaching process. This study identifies opportunities offered by a process of analysis of a mathematical model in the training of engineers. For this analysis, an interpretation of mathematical models as an object–user–representation triad was used; mathematical models were also considered a pedagogical approach to mathematics teaching. Based on this approach, a qualitative study was developed. A teaching experiment was designed, in which, through a set of tasks, the analysis of a model describing the percentage of moisture removed in a radial airflow food dryer is considered. Results show that students evidenced a comprehension of the model function as a covariation relationship and implemented strategies for understanding it through the graphs in the model. The situated character of students’ reasoning and their experience with professional practices of engineers are also highlighted

A posteriori error analysis of an augmented mixed formulation in linear elasticity with mixed and Dirichlet boundary conditions

[Abstract] We develop a residual-based a posteriori error analysis for the augmented mixed methods introduced in and for the problem of linear elasticity in the plane. We prove that the proposed a posteriori error estimators are both reliable and efficient. Numerical experiments confirm these theoretical properties and illustrate the ability of the corresponding adaptive algorithms to localize the singularities and large stress regions of the solutions

Optimal Location-Reallocation of Battery Energy Storage Systems in DC Microgrids

This paper deals with the problem of optimal location and reallocation of battery energy storage systems (BESS) in direct current (dc) microgrids with constant power loads. The optimization model that represents this problem is formulated with two objective functions. The first model corresponds to the minimization of the total daily cost of buying energy in the spot market by conventional generators and the second to the minimization of the costs of the daily energy losses in all branches of the network. Both the models are constrained by classical nonlinear power flow equations, distributed generation capabilities, and voltage regulation, among others. These formulations generate a nonlinear mixed-integer programming (MINLP) model that requires special methods to be solved. A dc microgrid composed of 21-nodes with existing BESS is used for validating the proposed mathematical formula. This system allows to identify the optimal location or reallocation points for these batteries by improving the daily operative costs regarding the base cases. All the simulations are conducted via the general algebraic modeling system, widely known as the General Algebraic Modeling System (GAMS)

Prejudice towards Muslims in The Netherlands:Testing integrated threat theory

This study uses integrated threat theory to examine Dutch adolescents’ (N ¼ 1; 187) prejudice towards Muslim minorities. One out of two participants was found to have negative feelings towards Muslims. Perceived symbolic and realistic threat and negative stereotypes were examined as mediators between antecedent factors (in-group identification, intergroup contact, and the endorsement of multiculturalism) and prejudice. Based on structural equation modelling, it was found that stereotypes and symbolic threats, but not realistic threats, predicted prejudice towards Muslims. Further, it was found that the effect of in-group identification on prejudice was fully mediated by symbolic threat, the effect of contact was partially mediated by stereotypes, and the effect of the endorsement of multiculturalism was mediated by both symbolic threat and stereotypes. In addition, contact and multiculturalism were directly associated with prejudice towards Muslims. The theoretical and practical implications of these findings are discussed.