On the formation and physical properties of the Intra-Cluster Light in hierarchical galaxy formation models

We study the formation of the Intra-Cluster Light (ICL) using a semi-analytic model of galaxy formation, coupled to merger trees extracted from N-body simulations of groups and clusters. We assume that the ICL forms by (1) stellar stripping of satellite galaxies and (2) relaxation processes that take place during galaxy mergers. The fraction of ICL in groups and clusters predicted by our models ranges between 10 and 40 per cent, with a large halo-to-halo scatter and no halo mass dependence. We note, however, that our predicted ICL fractions depend on the resolution: for a set of simulations with particle mass one order of magnitude larger than that adopted in the high resolution runs used in our study, we find that the predicted ICL fractions are ~30-40 per cent larger than those found in the high resolution runs. On cluster scale, large part of the scatter is due to a range of dynamical histories, while on smaller scale it is driven by individual accretion events and stripping of very massive satellites, $M_{*} \gtrsim 10^{10.5} M_{\odot}$, that we find to be the major contributors to the ICL. The ICL in our models forms very late (below $z\sim 1$), and a fraction varying between 5 and 25 per cent of it has been accreted during the hierarchical growth of haloes. In agreement with recent observational measurements, we find the ICL to be made of stars covering a relatively large range of metallicity, with the bulk of them being sub-solar.Comment: Accepted for Publication in MNRAS, 19 pages, 13 figures, 1 tabl

Type-4 spinors: transmuting from Elko to single-helicity spinors

In this communication we briefly report an unexpected theoretical discovery which emerge from the mapping of Elko mass-dimension-one spinors into single helicity spinors. Such procedure unveils a class of spinor which is classified as type-4 spinor field within Lounesto classification. In this paper we explore the underlying physical and mathematical contents of the type-4 spinor.Comment: 9 pages, 0 figure

On the bilinear covariants associated to mass dimension one spinors

In this paper we approach the issue of Clifford algebra basis deformation, allowing for bilinear covariants associated to Elko spinors which satisfy the Fierz-Pauli-Kofink identities. We present a complete analysis of covariance, taking into account the involved dual structure associated to Elko. Moreover, the possible generalizations to the recently presented new dual structure are performed.Comment: 9 pages, 0 figure

Project-Based Learning Approach in Teaching Information and Communications Technology

The idea of outcomes-based education shifts educators from content-deliverer to project manager, facilitating the investigation of learning approaches and focusing on deeper learning to develop students’ essential skills for their career readiness. This study established the effectiveness of the project-based learning (PBL) approach in teaching topics on Information and Communications Technology (ICT) among selected students of three programs at President Ramon Magsaysay State University (PRMSU), Iba, Zambales during 2nd semester SY 2018-2019. The study employed a descriptive research method to describe and interpret the present condition and relate to the desired objectives. Descriptive and inferential statistics were used in analyzing data gathered. The study findings conclude that student-respondents had a “Fair” level of performance in ICT topics during the pre-test while “Very Good” after using the PBL approach; the PBL approach was effectively based on the result analysis of mean, frequency counts, standard deviation, and t-test computation. The variance test analysis revealed a significant improvement in students’ performance on ICT topics, as reflected in the post-test result. Recommendations are provided

Research Capabilities among Selected Graduate School Students in Philippines

With the increasing demand for quality research to cope up with the industry trends, understanding the need among researchers should primarily be established to further improve capacity and practices over the production of theoretical knowledge. Essential to support is the notion of exploring issues then stimulate the concern. This study established the concern on research capabilities among Graduate School student-respondents at President Ramon Magsaysay State University conducted during the First Semester School Year 2018-2019. The study made used of descriptive research design with survey questionnaire as the main research instrument. The data was processed using descriptive and inferential statistical tools. The study concludes that respondents perceived their capabilities in writing research proposal and publishable research paper both as “Moderately Capable”. The respondents perceived the availability of facilities, time, training, funding, other resources and support from agency in doing research as “Moderately Available”. The analysis of variance test revealed that  there is significant difference on the research capabilities of respondents in writing research proposal when grouped according to position and highest educational attainment; significant in writing publishable research paper when grouped according to sex, position and research seminars/trainings attended; significant in the  availability of facilities, time, training, funding, other resources and support from agency in doing research when grouped according to sex, position and research seminars/trainings attended

Using Technology to Determine Factorability or Non-factorability of Quadratic Algebraic Trinomials

This paper is aimed for mathematics educators who teach algebra, more specifically, the factoring of quadratic algebraic expressions, and who want to enhance student learning of this topic using technology in conjunction with the Middle Term Splitting Method (Donnell, 2010; MTSM 2016a; MTSM 2016b). We will use technology-based algebra and geometry connections to help determine factorability or nonfactorability of quadratic algebraic trinomials over the integers, over the real numbers, and over the complex numbers, both with clarity, certainty and with understanding by using two equations, one derived from the coefficients of the outer terms and the other from the middle term of the quadratic algebraic trinomial. Overall, the efficiency of determining factorability or non-factorability of quadratic algebraic trinomials, using Cabri Geometry II Plus (or a graphing calculator) together with the MTSM, makes this topic comprehensible in a technology-rich environment

Plaza Union Comunal

56 p.El presente trabajo de título tuvo como objetivo el diseño, gestión y construcción de una obra, la que por emplazarse en lo público se hace pública. La obra se proyectó a base de una necesidad latente que se descubrió una vez analizado el lugar, naciendo esta, del estudio social, espacial y económico que se hizo en la localidad. Se realizó un análisis de la situación actual y futura de lugar, con el afán de identificar y comprender las variables relevantes que influyen en el lugar físico e identificar las oportunidades existentes en éste. Paralelamente se estudian casos en que se ha logrado crear arquitectura en entornos con características similares. La obra comenzó de a poco a generar un interés por parte de los pobladores, lo que se tradujo en una fuerte intención de estos por formar parte de la obra, tanto en su planeamiento como en su construcción, lo que creo en estos una fuerte necesidad de compromiso