ETOLOGÍA Y BIENESTAR ANIMAL

GUÍA PEDAGÓGIC

MANEJO DE FAUNA SILVESTRE

GUÍA PEDAGÓGIC

Characterization of recycled polycarbonate from electronic waste and its use in hydraulic concrete: improvement of compressive performance

Artículo asociado a un proyecto de Doctorado en Ciencia de MaterialesTransparency, excellent toughness, thermal stability and a very good dimensional stability make Polycarbonate (PC) one of the most widely used engineering thermoplastics. Polycarbonate market include electronics, automotive, construction, optical media and packaging. One alternative for reducing the environmental pollution caused by polycarbonate from electronic waste (e-waste), is to use it in cement concretes. In this work, physical and chemical characterization of recycled polycarbonate from electronic waste was made, through the analysis by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and scanning electron microscope (SEM). Then cement concrete was made with Portland cement, sand, gravel, water, and this recycled polycarbonate. Specimens without polycarbonate were produced for comparison purposes. The effect of the particle sizes and concentrations of recycled polycarbonate within the concrete, on the compressive strength and density was studied. Results show that compressive strength values and equilibrium density of concrete depend on the polycarbonate particle sizes and its concentrations; particularly the highest compressive strength values were 20% higher than that for concrete without polycarbonate particles. Moreover, morphological, structural and crystallinity characteristics of recycled polycarbonate, are suitable for to be mixed into concret

Efficient approaches to agile cost estimation in software industries: a project-based case study

Agile was invented to improve and overcome the traditional deficiencies of software development. At present, the agile model is used in software development very vastly due to its support to developers and clients. Agile methodology increases the interaction between the developer-client, and it makes software product defects free. The agile model is fast and becoming more popular because of its features and flexibility. The study shows that the agile software development model is an efficient and effective software development strategy that easily accommodates user changes, but it is not free from errors or shortcomings. The study shows that COCOMO and Planning Poker are famous cost estimation procedures, but are not ingenious for agile development. We conduct a study on real-time projects from multinational software industries using different estimation approaches to estimate the project’s cost and time. We thoroughly explain these projects with the limitations of the techniques. The study has proven that the traditional and modern estimation approaches still have limitations to accurate estimation of projects

Estimación de la densidad poblacional del venado cola blanca texano (odocoileus virginianus texanus), introducido en la UMA "Ejido de Amanalco" Estado de México

La introducción del O.v. texanus en Amanalco, Estado de México, ocurrió en el año 2000 con diez ejemplares y para estimar la densidad poblacional actual se utilizó el método indirecto; realizándose 13 transectos lineales con un área promedio de muestreo de 26 400 m2 para cada uno, utilizando la fórmula de Eberhardt y Van Etten (1956). Con cuatro repeticiones distribuidas en verano e invierno. Se observó una densidad de 0.4216 y 0.5238 venados/ha respectivamente que corresponde a la distribución natural de la subespecie (O.v mexicanus), siendo la especie más vulnerable de las 14 que se encuentran en nuestro país. Se concluye que la introducción de una subespecie exótica y su establecimiento exitoso, representa un riesgo latente de hibridación con la especie nativa

Recycled cellulose from Tetra Pak packaging as reinforcement of polyester based composites

Addressing the environmental problems caused by waste generated by Tetra Pak packaging, in this work, polyester based composites with 80% of polyester resin and 20% of silica sand were elaborated; where the silica sand was partially replaced by recycled cellulose from waste Tetra Pak containers at concentrations of 1, 2, 4 and 6% by weight. Both recycled cellulose and composite specimens were subjected to ionizing radiation process by using gamma rays. The results show improvements on the mechanical properties (compressive and flexural strength as well as modulus of elasticity) of the composites when they are irradiated at 100 and 200 kGy. Such improvements can be related with the structural modifications caused by gamma irradiation on the cellulose fibers, including changes in the morphology and the crystallinity; which were analyzed through to SEM, IR and XRD techniques

A learners experience with the games education in software engineering

The utilization of games and its components in software building training isn’t new. In reality, their usage in Software development training is found to look into papers for numerous decades. Be that as it may, there is little data about the real reception of these methodologies in games designing and development training in terms of software building. Consequently, the objective of this paper is to research the utilization of game’s components in programming designing instruction, in the viewpoint of teachers. To accomplish this objective, this examination proposes and breaks down the aftereffects of a study replied by numerous product designing teachers. We test the members by welcoming multiple instructors from settled colleges and instructive organizations of various districts. The first objective of the review is to gather data relates to the utilization of important games and rich gamification in the student classrooms, and the second objective is to comprehend information territories and the pre-owned game-related techniques. The outcomes show that the more significant part of the educators knows about these instructive methodologies, the games were embraced by various members. Games that are generally played to cover “Programming Process” & “Task Management.” The utmost utilized game apparatuses are Points scoring, Quizzes solving, and meet challenges. The outcomes additionally reveal that the fundamental explanations behind not embracing the assets are the absence of information, lack of data about essential games for encouraging programming designing, and the absence of time to design and remember these methodologies for the classes At long last, results show a definite propensity towards the future appropriation of these game-related methodologies by the product developing teachers

Gamma radiation as a recycling tool for waste materials used in concrete

Over the course of the last 50 years, a large number of major technological advances have contributed to the development of higher-strength, high-performance materials that provide excellent benefits. Nevertheless, in most cases, after a very short useful life, these products become waste material and contribute to environmental degra‐ dation. This situation has created an environmental crisis that has reached global proportions. In efforts to combat this issue and to promote sustainable development and reduce environmental pollution, some investigations have focused on recycling using innovative and clean technologies, such as gamma radiation, as an alternative to conventional mechanical and chemical recycling procedures. In this context, the reuse and recycling of waste materials and the use of gamma radiation are useful tools for improving the mechanical properties of concrete; for example, the compressive strength and modulus of elasticity are improved by the addition of waste particles and application of gamma radiation. In this chapter, we propose the use of gamma radiation as a method for modifying waste materials; for instance, polyethylene terephthalate plastic bottles, automotive tire rubber, and the cellulose in Tetra Pak containers, and their reuse to enhance the properties of concrete

A comparison of the NCT Reichert R7 with Goldmann applanation tonometry and the Reichert ocular response analyzer

P>Purpose:The aim of this study was to evaluate the accuracy of intraocular pressure (IOP) values from the new non-contact tonometer (NCT) Reichert R7 by comparing results with those from Goldmann applanation tonometry (GAT) and the Reichert Ocular Response Analyzer (ORA). Other ocular dimensions were assessed to evaluate their potential influence on the IOP values obtained.Methods:Ninety two right eyes from 92 adults aged between 21 and 59 years (mean 34.9 +/- 11.7 years) were enrolled in this study. IOP was measured with R7, ORA and GAT. All measurements were taken between 14:00 and 16:00 in the afternoon. Corneal resistance factor (CRF) and corneal hysteresis were measured with the Reichert ORA. The spherical equivalent refractive error was obtained using an open field auto-refractor (WAM5500; Grand Seiko) and corneal curvature, anterior chamber depth, corneal diameter and axial length were assessed with an optical coherence biometer (IOL Master; Zeiss Meditec, CA, USA).Results:The mean values for IOP measurements were 15.20 +/- 3.37 mmHg (R7), 13.49 +/- 3.55 mmHg (GAT), 15.01 +/- 3.38 mmHg (ORA IOPcc) and 14.44 +/- 3.47 mmHg (ORA IOPg). With the exception of the CRF (rho = 0.72 p < 0.001) the correlations between ocular parameters and IOP obtained with the R7 were neither statistically nor clinically significant.Conclusions:The new NCT, R7 overestimated the IOP compared with GAT in normal, healthy eyes by about 1.7 mmHg on average (95% confidence range of approximately -2 to +6mmHg). The measures provided by the R7 were significantly influenced by the stiffness of the corneal tissue as measured by the ORA CRF value but not by other dimensional parameters of the eye