bluuebunny/crossref_metadata_2025 huggingface dataset:
Intelligent Adaptable e-Assessment for Inclusive e-Learning
Authors: Nacheva-Skopalik Lilyana , Green Steve
Published: January 2016

Access to education is one of the main human rights. Everyone should have access to education and be capable of benefiting from it. However there are a number who are excluded, not because of a lack of ability but simply because they have a disability or specific need which current education systems do not address. A learning system in which content, tools and interfaces can be personalised and adapted to the individual needs and preferences of a variety of learners, including those with disabilities, becomes inclusive. Assessment is an integral part of an e-learning environment and therefore it has to provide not only inclusive e-learning content but also inclusive e-assessment. The proposed research investigates an intelligent adaptable e-learning system for assessing students' level of skill, knowledge and understanding regardless of their disabilities or accessibility needs. It is based on an innovative use of world's first open source adaptable widget design and authoring toolkit (WIDGaT) as the prototyping environment.
From Website to Moodle in a Blended Learning Context
Authors: Buus Lillian
Published: January 2016

This paper presents findings collected from a collaborative implementation project established in Spring 2008 between Aalborg University's IT-department in the Faculty of Social Science (FSS) and the E-Learning Cooperation Unit (ELSA) with the view to implement Moodle in FSS. The purpose of this cooperation was conceived from an organisational desire to establish a virtual learning environment (VLE), where it was possible, to build activities and underpin the pedagogical approach. Another perspective was to further improve the communication between the administration, teachers and students. This paper will highlight the development process and some of the didactic considerations undertaken for the implementation. The evaluations undertaken during the process will also be presented, along with the results collected in the use of Moodle to highlight the educational changes.
Porosity of the Ternary Gypsum-Based Binders with Different Types of Pozzolan
Authors: Doleželová Magdaléna , Vimmrová Alena
Published: January 2016

Ternary gypsum-binders with different types of pozzolan were stored in the water and in the air. Brick powder, microsilica and blast slag were used as a pozzolan admixture. The quantity of the pozzolan in the mixture was determined from the amount of the amorphous phase in the pozzolan. Mixtures with pozzolans do not lose strength when stored in the water. Porosimetry shows that the product of the pozzolanic reaction started to develop.
Changes of the Properties of Cement Paste with Fly Ash Exposed to the High Temperature
Authors: Lovichová Romana , Padevět Pavel , Fornůsek Jindřich
Published: January 2016

This paper describes influence of exposure to high temperatures on material properties of cement paste with addition of fly ash. The properties of cement pastes are significant to the assumption behaviour of concrete and concrete structures. In the cement paste containing fly ash, the effect of high temperature up to 600 ° C causes the changes of content in physically bound water and the change in the material structure. The results of research indicate changes that are reflected in the material properties of the cement paste as compressive strength, tensile strength in bending.
Resistance of Concrete with Metakaolin Addition to Acid Environment
Authors: Reiterman Pavel , Tomek Jiří
Published: January 2016

Durability of concrete is a crucial parameter with respect to lifetime of concrete structures, nevertheless it is very complex issue. There is number of methodologies to predict final durability of concrete and substantial part of them is based on the accelerated tests in severe conditions or environment. Present paper deals with the experimental study of the influence of concrete composition on the resistance to sulfate environment. Metakaolin replacement of Portland cement was incorporated in the studied mixtures which were subjected to various sulfate containing solutions. Final resistance was evaluated by means of loss of mass and compressive strength. Performed experimental program confirmed positive influence of metakaolin replacement up to 30 % by cement weight, however higher doses reduced workability. All studied mixtures with metakaolin addition exhibited improved resistance to acid environment.
Determination of Thermal Conductivity on Lightweight Concretes
Authors: Bodnárová Lenka , Hroudová Jitka , Zach Jiří , Sovová Kateřina
Published: January 2016

A range of testing methods were used to study the potential structural changes as a result of the effects of high temperatures on lightweight types of concrete developed above all for fire resistant structures. One such test for monitoring changes in concrete structures is the non-stationary determination of the coefficient of thermal conductivity using the hot wire method. The matrix structure progressively collapses as a result of the effects of high temperatures on the concrete structure ́s surface because erosion takes place of the matrix and aggregate porous structures. The degradation of the porosity of the concrete results in the deterioration of its thermal insulating properties. This paper assesses the dependence of the thermal conductivity coefficient of lightweight concretes on temperature and determines the potential occurrence of structural changes in the lightweight concrete matrix. The results were verified using other methods to determine the concrete ́s resistance to thermal load.
Using 2D Digital Image Analysis to Locate Position of Micro Fibers in Cross-Sections of Fiber-Reinforced Concrete
Authors: Trejbal Jan , Kopecký Lubomír , Fládr Jozef , Tesárek Pavel , Nežerka Václav , Prošek Zdeněk
Published: January 2016

This work deals with determination of location of micro fibers positions in fiber-reinforced concrete. The digital images of sectioned cement-paste samples with dimension equal to 40 × 40 mm were used as an information source about the monofilaments positions. Properly acquired digital image of high resolution allows to determinate the number of fibers in samples cross sections and relate theirs coordinates to any point. Optical microscope Carl Zeiss Axio Zoom.V16 with camera and software allowing individual shots composition of examined samples surface was used to obtain these parameters. Cement pastes reinforced with PET (polyethylene terephthalate) micro fibers having diameter equal to 0.4 mm were studied. The total number and the fibers distribution along the height and width of the sample cross section were examined.
Impact of Grinding Technology on Final Properties of Portland Cement
Authors: Dvořák Karel , Dolak Dusan , Hájková Iveta
Published: January 2016

Portland cement got his name derived from the appearance of concrete that resembles sandstone located near city of Portland in England. In 1824, John Aspdin was granted a patent for the production of Portland cement.In the past, energy and economic demands on production of cement were lower than they are today. Production was characterized by a slower burning mode and coarser grinding. Product produced this way were reaching lower compressive strength.Currently there are several companies producing Portland cement. Main ones in Czech Republic are Holcim, Heidelbergcement group and Lafarge Cement a.s. Their production methods are very similar. The differences are mostly in the possibility of using local raw materials with different chemical composition and the technical equipment of factories. In the production, the main emphasis is on reducing energy and financial cost.One way to save energy and money is to use mechanical-chemical activation when grinding Portland clinker.
Comparison of Compressive Strength and Young’s Modulus of Cement Samples with Different Types of Aggregate
Authors: Topič Jaroslav , Osvald Andrej , Nežerka Václav , Prošek Zdeněk , Lidmila Martin , Valentin Jan , Tesárek Pavel
Published: January 2016

Several different types of aggregates were used for production of tested samples, namely: the standard sand of a fraction 0-4 mm, quartz sand of a fraction 0-0.4 mm, finely ground recycled limestone powder of a fraction 0-0.07 mm, finely ground recycled concrete of a fraction 0-0.13 mm (ground by Lavaris Company), and finally crushed bricks of a fraction 2-5 mm. The Portland cement CEM I 42.5 R produced in Radotín was used as a binder. Testing was carried out on prismatic samples of dimensions 40 × 40 × 160 mm. Compressive strength and static Young ́s modulus were measured for individual samples and these differed by the type of a microfiller and its amount.
Relation between Parameters of Plasters Measured by Non-Destructive and Destructive Methods
Authors: Kočová Markéta , Zatloukal Jan
Published: January 2016

Main target of this study is a comparison of material properties of plasters, which were obtained with use non-destructive methods and destructive methods and find out relation between them. These parameters were investigated on plasters. In this research the destructive methods were focused in obtain three parameters: the compressive strength, the tensile strength and the modulus of elasticity. For non-destructive testing was used pulse velocity method. Testing was carried out on specifically fabricated test specimens. With this study were obtained relations of the parameters for each type plasters measured with the non-destructive methods and with the destructive techniques. Obtained data were compared and then evaluated. These relations are very important and necessary for possibility to eliminate destructive methods in future.
Resistance of Refractory Cement Composite to Cyclic Temperature Loading
Authors: Holčapek Ondřej
Published: January 2016

The aim of this study was to describe mechanical properties decline and macroscopic changes after cyclic thermal load of refractory slabs. Investigated elements were made from refractory cement composite containing natural basalt aggregate, fine ceramic powder, aluminous cement with high volume of Al2O3, different dosage of basalt fibres, water and plasticizer. Slabs with dimension 300 x 200 x 38 mm were exposed to elevated temperature 600 °C for three hours (temperature gradient 10 °C/min) and cooled to laboratory condition. This loading cycle was repeated six times. Tensile characteristics were investigated by bending test with clear span of supports 200 mm. Maximum force and displacement increased with increasing amount of basalt fibres. Maximum flexural strength of slabs corresponded to material characteristics measured on specimens 40 x 40 x 160 mm. Slabs with 1% of basalt fibres achieved flexural strength 4.8 MPa (after six loading cycles). The highest weight decline took place after the first loading cycle. Successful design of original fibre-cement composite has been approved by cyclic loading of larger dimension specimens.
High Performance Concrete with SCM and Recycled Aggregate
Authors: Kubissa Wojciech , Jaskulski Roman , Koper Artur , Supera Marcin
Published: January 2016

In the article the possibility of utilization of two waste materials: Recycled Concrete Aggregate (RCA) fraction 4-16 mm and Class F fly ash (from coal burning power plant) in high perfor-mance concrete (HPC) was presented. Concrete with RCA were made with varying amount of cement and Suplementary Cementing Materials (SCM). The specimens of concrete were tested to compare mechanical properties as well as some properties related to the durability of concrete. Compression strength values up to 71.40 MPa were achieved and good values of properties determinig durability of reinforced concrete structures.
The Use of Recycled Concrete in Asphalt Composites
Authors: Konvalinka Adam , Svoboda Pavel
Published: January 2016

High traffic load and temperature are the two critical issues that affect the quality of asphalt pavement. Due to these issues asphalt skeleton is used, spilled with cement paste. Rising asphalt and cement concrete, which due to the high strength and high elasticity can withstand high static loads and temperature changes. However, an important factor for sporadic use and incidence are composite's financial demands. The most expensive item is utilization of cement. Therefore, financially demanding cement can be replaced by secondary raw material. Thanks to composition and prerequisite of additional hydration recycled concrete was chosen in the form of fine ground powder.
Timber-Concrete Composite Structures with Semi-Rigid Connections
Authors: Kuklík Petr , Kuklíková Anna , Gregorová Anna
Published: January 2016

This paper deals with behavior of timber-concrete composite structures with mechanical connection systems. The paper is focused to two different connection systems: using dowel-type fasteners and using special surface connector. Behavior of dowel-type connection system is based on modification of Johansen ́s equations valid for timber to timber connections. Behavior of connection system with special surface connector is evaluated by experiments and numerical simulations.
Differences in the Mechanical Properties of Lightweight Refractory Cementitious Composites Reinforced by Various Types of Fibers
Authors: Jogl Marcel , Koťátková Jaroslava , Reiterman Pavel
Published: January 2016

Development of new composite materials is the worldwide extremely progressive branch of engineering activity. Composite materials are applied in many industries. The principle of composite materials is a combination of different materials providing an entirely new material with specific properties. Fiber-reinforced composites rank to the most frequently used composites because of their suitable mechanical properties. There were studied mechanical properties of fibre reinforced cementitious composites (FRCC) exposed to high temperatures of 600 °C and 1000 °C in the paper. For the production of refractory FRCC were used aluminous cement Secar®71 with 70 % of Al2O3. Various composites differed in the used type of fibers - basalt, carbon and ceramic fibres were applied in doses of 2 % by volume. For the experimental program were prepared prismatic specimens with the total dimensions of 40 × 40 × 160 mm3 and cured for 28 days in humid environment. Residual bulk density, flexural and compressive strength were investigated in the performed experimental program. The results showed the positive effect of the fibers used in refractory composition and the dependence on the length of the used fibers.
The Properties of Fine-Aggregate Concrete with Recycled Cement Powder
Authors: Pavlů Tereza , Šefflová Magdaléna , Hujer Vladimír
Published: January 2016

The main aim of this contribution is verification of properties of concrete with partial replacement of cement by recycled cement powder originating from waste concrete. The main topic of this article is the study of influence of partial replacement of cement by recycled cement powder (RCP) to the cement paste properties, workability of fresh concrete and strength development and dynamic modulus of elasticity of fine aggregate concrete with partial replacement of cement. The workability of fresh concrete were tested by flow table test. The compressive strength, tensile strength in bending and dynamic modulus of elasticity were tested at the age 7, 14, 28 and 90 days. Partial replacement of cement was 0, 5, 10 and 15 % for all these tests. Mechanical properties were investigated by using cubic and prismatic specimens. The determination of the initial setting time of cement paste were measured by automatic Vicat apparatus for replacement rate of cement 0, 5, 10, 15 and 25 %.
Determination of Properties of Concrete Floor after a Fire and Renovation
Authors: Mikulica Karel , Hela Rudolf , Dufka Ámos
Published: January 2016

Concrete exposed to high temperature considerably changes its properties down to total destruction. The paper describes renovation of concrete floor damaged by a fire of a factory building. Individual steps of determination of damage of concrete floor structures caused by high temperatures are described. Structure of damaged floor was technically analyzed, redevelopment was designed and renovation works were carried out.
Possible Types of Degradation of Concrete in the Power Industry
Authors: Říhová Zdeňka , Zatloukal Jan
Published: January 2016

This paper summarizes different types of degradation of concrete in the energy industry. There is described the most of important kinds of degradation and what effects they can cause. In conclusion, this article is formulated several points to prevent the degradation of building materials.
Effect of Very Early Prestressing on Ultimate Geometry of Precast Concrete Element
Authors: Černosta Lukáš , Štemberk Petr
Published: January 2016

This paper describes an experimental investigation of the effect of early age prestressing on the ultimate geometry and the load bearing capacity of precast concrete elements. The experimental is performed with a small-scale T-beam which are prestress at three different ages. The experimental results obtained after seven days after prestressing are compared with calculated estimations on the shrinkage and creep according to B3 model.
Multi-Functional High-Performance Cement Based Composite
Authors: Bažantová Zdeňka , Kolář Karel , Konvalinka Petr , Litoš Jiří
Published: January 2016

The paper introduces development of new type of high-performance Portland cement based composite applicable for number of practical utilization. The fundaments of performed research was to design mixture with controlled process of hydration, easy production, suitable time of setting, good workability and rapid evolution of mechanical properties as well as satisfactory long-term stability of hardened composite. Selected mixture were evaluated by means of mechanical properties and volume changes determination.
Enhancing Engineered Cementitious Composite by External and Internal Hydrophobization
Authors: Hrbek Vladimír , Petráňová Veronika , Němeček Jiří
Published: January 2016

Engineered cementitious composites (ECC) are characterized with increased ductility and strain hardening due to its internal structure design. ECC is especially useful for applications where common steel reinforced concrete is not applicable and the structural members undergo large strains or dynamic action. Such conditions are often combined with environmental effects where structures are partly or fully immersed in water possibly containing some harmful substances such as chloride or sulfuric ions. To maintain sufficient durability of the composite it is necessary to decrease its water absorbability. One of the very efficient ways to do this is to use external or internal hydrophobization of the composite as shown in this paper.
Precambrian geology of Ian Calder Lake, Cape Barclay, and part of Darby Lake map areas, south-central Nunavut
Authors: Frisch T
Published: January 2016

The map areas are located southwest and east of Chantrey Inlet in the Churchill Province of the Canadian Shield and take in a late Archean granitoid complex and several amphibolite-grade supracrustal belts, all with northeasterly structural trends. The granitoid
complex consists largely of foliated granodioritic to tonalitic plutonic rocks, of which a 2.6 Ga, microcline augen-rich variety is particularly abundant. Low- to medium-pressure, granulite-facies gneiss and K-feldsparphyric orthopyroxene granite (2.6 Ga) exposed in northern Ian Calder Lake and
southern Cape Barclay map areas apparently belong to a single, (?)fault-bounded belt 10-15 km wide. Straight gneiss that may belong to the Queen Maud block is bordered by the Chantrey fault zone, which runs through northwestern Ian Calder Lake map area. The Barclay supracrustal belt, which lies east
of Chantrey Inlet, has attributes of a greenstone belt and is interpreted as being intruded by 2.6 Ga granodiorite. Outcropping in northeastern Ian Calder Lake map area, the highly deformed Franklin belt comprises metasedimentary rock, schist and amphibolite and is correlated with the Barclay belt.
Northeast of, and on strike with, the Franklin belt, lies the Chantrey belt, a doubly plunging, locally thrust-faulted synclinorium 175 km long and 3-7 km wide. It consists entirely of sedimentary rock (carbonate, pelite, psammite, and conglomerate) metamorphosed at 0.3 GPa or less and
470°-570°C (generally slightly lower than the temperatures estimated for (?)Aphebian metamorphism of the Barclay belt). The Montresor belt, in southern Ian Calder Lake map area, is an open synclinal succession, about 1800 m thick, of mainly meta-arenaceous rock. The Chantrey and Montresor
belts are interpreted to represent intracontinental, shallow-water deposits. As both belts are intruded by pegmatite dated in the Chantrey belt at 1.7 Ga (K-Ar muscovite), they are regarded as early Proterozoic.
Mapping, geophysics, and groundwater modelling in aquifer delineation, Fraser Lowland and Delta, British Columbia
Authors: Ricketts B D
Published: January 2016

The Fraser Lowland Hydrogeology Project (1993-1996) is outlined. A groundwater database has been created that is suitable for scientific research and resource management. With the aid of a geographic information system, the database was used to develop methods
for subsurface aquifer mapping, construction of hydrostratigraphic cross-sections and three-dimensional models, and overlaying of geophysical profiles. A major component of the project was the testing of different geophysical methods (high-resolution seismic reflection, ground-penetrating radar,
electromagnetism, cone penetrometry), to determine their usefulness for defining hydrostratigraphic architecture and groundwater quality. Although each method measures different properties of the Earth, they were found to complement one another with respect to depth of penetration and resolution.
The groundwater database, aquifer maps, and results from the geophysical surveys were used in preliminary groundwater-flow models.
Inappropriate preinjury warfarin use in trauma patients
Authors: Hon HH , Elmously A , Stehly CD , Stoltzfus JC , Granson MA , Stawicki SP , Hoey BA
Published: January 2016

Introduction:

Warfarin continues to be widely prescribed for a variety of conditions. It has been shown that preinjury warfarin may worsen outcomes in trauma patients. We hypothesized that a substantial proportion of injured patients seen at our institution were receiving preinjury warfarin for inappropriate indications and that a significant number of such patients had subtherapeutic or supratherapeutic international normalized ratios as well as increased mortality.

Materials and Methods:

A retrospective review of registry data from a Level I trauma center was conducted for the period from January 2004 to July 2013. Included were patients aged ≥22 years (based on the youngest recorded patient on warfarin in this study). Abstracted variables included patient age, Injury Severity Score (ISS), Maximum Abbreviated Injury Score for Head (MAISH), mortality, hospital length of stay (HLOS), indication(s) for anticoagulant therapy, admission Glasgow Coma Scale (GCS), and admission international normalized ratio (INR). Suitability of warfarin indication(s) was determined using the most recent American College of Chest Physicians (ACCP) Guidelines. Inappropriate warfarin administration was defined as use inconsistent with these guidelines. For outcome comparisons, a case-control design with 1:1 ratio was used, matching patients taking preinjury warfarin to a random sample of trauma patients who were not taking warfarin. Severe traumatic brain injury (sTBI) was defined as MAISH ≥4.

Results:

A total of 700 out of 14,583 patients aged ≥22 years were receiving preinjury warfarin (4.8% incidence, WG). This group was age- and ISS-matched with 700 patients (4.8% total sample) who were not taking warfarin (NWG) in a total case-control sample of 1,400. The two groups were similar in age, gender, ISS, and initial GCS. According to the ACCP guidelines, 115/700 (16.4%) patients in the warfarin group were receiving anticoagulation for inappropriate indications. Nearly 65% of the patients were outside of their intended INR therapeutic window (43.4% subtherapeutic, 21.6% supratherapeutic). Overall, median HLOS was greater among patients taking preinjury warfarin (4 days vs 2 days, P < 0.010). Mortality was higher in the WG (7.4% or 52/700) than in the NWG (1.9% or 13/700, P < 0.010). Patients with sTBI in the WG had significantly greater mortality (12.8% or 34/266) than those with sTBI in the NWG (5.3% or 9/169, P < 0.013).

Conclusion:

A significant proportion of trauma patients admitted to our institution were noted to take warfarin for inappropriate indications. Moreover, many patients taking warfarin had either subtherapeutic or supratherapeutic INR. Although warfarin use did not independently predict mortality, preinjury warfarin use was associated with greater mortality and HLOS in the subset of patients with sTBI. Safety initiatives directed at better initiation and management of warfarin are needed.
Un dispositivo teórico-metodológico para comprender las prácticas profesionales
Authors: Borri-Anadon Corina
Published: January 2016

Este trabajo presenta un dispositivo teórico-metodológico que permite tener en cuenta la complejidad inherente a la noción de práctica profesional en el marco de una investigación en educación. Tras abordar diversas perspectivas teóricas acerca de esta noción, se proponen dos pistas para favorecer su operacionalización. El dispositivo desarrollado se apoya en un bricolaje metodológico (en el sentido que dio Lévi-Strauss [1962] a esa palabra) constituido por tres lecturas acumulativas : restituyente, de contraste y analítica. Cada una de esas lecturas atribuye una importancia específica al estatus de la palabra de los profesionales que han participado en la investigación y a la palabra del investigador. Este dispositivo nos parece heurísticamente rico para estudiar las prácticas de diferentes actores escolares, en particular los docentes, porque por un lado, permite articular el decir y el hacer y por otro, utiliza diferentes tipos de datos, diferentes estrategias analíticas y diferentes estatus de la palabra.
El método de ABP en contextos educativos rurales y socialmente desfavorecidos de la Educación Infantil.
Authors: Remacha Irure Ainhoa , Belletich Ruiz Olga
Published: January 2016

En este artículo presentamos algunos resultados obtenidos con el proyecto de innovación educativa "Gomer Llaccta (Aldea Verde): La magia del reciclaje", desarrollado con 92 niños/as de Educación Infantil de una escuela rural situada en una zona empobrecida del norte de Perú. Forma parte de una investigación en la que se analizaron las implicaciones del proyecto en las cuatro dimensiones de estudio: psicosocial, pedagógica, didáctica y social. El diseño de una Unidad Didáctica Integrada (UDI) y el uso del método de Aprendizaje basado en proyectos (ABP), junto con la Estrategia de Enseñanza aprendizaje por Acción Razonada (EEAR), sirvieron para evidenciar su incidencia y repercusión en las formas de participación de los estudiantes, en el cambio de rol de los docentes y en el avance hacia un modelo de construcción del conocimiento.
La Familia: Formadora primigenia
Authors: Villalobos Pérez-Cortés Marveya
Published: January 2016

El carácter familiar es un reflejo de la realidad de la vida social.  Se sustenta en las familias, principalmente aquellas que funcionan y permanecen en el tiempo, creando un haz de relaciones interpersonales e intergeneracionales. Su presencia otorga  estabilidad y continuidad en el tiempo a  sus integrantes y, promueve   un proyecto que trasciende a cada uno y genera bienestar para todos.La familia, formadora primigenia, acoge, escucha, comprende, advierte y aconseja, por ende es necesario la renovación de la familia de siempre para tiempos nuevos. Apoyar a la familia en su parte orgánica, estructural y funcional que como todo ser vivo, requiere conservarse y renovarse, reforzando el matrimonio estable, prestigiando y favoreciendo la maternidad, formando familias fuertes y estables. La institución familiar es un referente como soporte de la sociedad, al anteponer en su actuación diaria, los principios morales y éticos, así como la honestidad.
Lechos de la actividad dramática para una investigación-acción en educación infantil
Authors: Neiva Manuel , Lopes Amélia , Pereira Fátima
Published: January 2016

Este artículo presenta el marco conceptual, el dispositivo metodológico y resultados de un estudio en ciencias de la educación, bajo una metodología de investigación-acción, con la finalidad de comprender cuál es la contribución del desarrollo de competencias dramáticas en el desarrollo profesional del educador infantil. Los autores y nueve educadoras infantiles colaboradoras - de tres instituciones localizadas en Porto-Portugal -, a través de la utilización de técnicas de observación, de conversación y de formación, evidenciaron la amplitud de las correlaciones entre los intereses y la importancia de la expresión (dramática) de los educadores. Así, se revalorizó y se re-conceptualizó la presencia y las potencialidades de la actividad dramática como medio y forma de (re)conocimiento de la articulación del desarrollo personal y profesional, evocando la acción, el pensamiento creativo y la reflexión crítica, como respuestas a las necesidades de cada persona y grupo participante.
Los problemas aritméticos de enunciado verbal según Luria y Tsvetkova al finalizar primer ciclo de enseñanza básica en Escuelas municipales de la comuna de Talca
Authors: Valdés Morales René
Published: January 2016

El objetivo de la presente investigación es caracterizar los problemas aritméticos de enunciado verbal, según la categorización de Luria y Tsvetkova, que resuelven los estudiantes al fnalizar el 1er ciclo de enseñanza básica en las escuelas municipales de enseñanza básica de la comuna de Talca. Este estudio, se llevó a cabo bajo la aplicación de un instrumento validado de problemas aritméticos de enunciado verbal, basados en la complejidad progresiva que establecen los autores. La metodología de la investigación corresponde a un estudio no experimental, de alcance descriptivo e interpretación cuantitativa. En relación a los resultados fnales del estudio, se puede establecer que los estudiantes de la comuna de Talca, al fnalizar el primer ciclo, no alcanzan el desempeño esperado en la resolución de problemas aritméticos de enunciado verbal, viéndose diferencias según género, no alcanzando el nivel esperado para su edad y nivel.
Exact Solutions for Fractional Differential-Difference Equations by (G'/G)-Expansion Method with Modified Riemann-Liouville Derivative
Authors: Bekir Ahmet , Guner Ozkan , Ayhan Burcu , Cevikel Adem C.
Published: January 2016

In this paper, the (G'/G)-expansion method is suggested to establish new exact solutions for fractional differential-difference equations in the sense of modified Riemann-Liouville derivative. The fractional complex transform is proposed to convert a fractional partial differential difference equation into its differential difference equation of integer order. With the aid of symbolic computation, we choose nonlinear lattice equations to illustrate the validity and advantages of the algorithm. It is shown that the proposed algorithm is effective and can be used for many other nonlinear lattice equations in mathematical physics and applied mathematics.
Impact of Linear Operator on the Convergence of HAM Solution: a Modified Operator Approach
Authors: Hussain S. T. , Nadeem S. , Qasim M.
Published: January 2016

The linear operator plays an important role in the computational process of Homotopy Analysis Method (HAM). In HAM frame any kind of linear operator can be chosen to develop a solution. Hence, it is easy to introduce the modified/physical parameter dependent linear operators. The effective use of these operators has been judged through solving fluid flow problems. Modification in linear operators affects the solution and improves the computational efficiency of HAM for larger values of parameters. The convergence rate of the solution is rapid and several times higher resulting in lesser computational time.
A Two-Level Method for Pressure Projection Stabilized P1 Nonconforming Approximation of the Semi-Linear Elliptic Equations
Authors: Zhang Sufang , Yan Hongxia , Jia Hongen
Published: January 2016

In this paper, we study a new stabilized method based on the local pressure projection to solve the semi-linear elliptic equation. The proposed scheme combines nonconforming finite element pairs NCP1–P1 triangle element and two-level method, which has a number of attractive computational properties: parameter-free, avoiding higher-order derivatives or edge-based data structures, but have more favorable stability and less support sets. Stability analysis and error estimates have been done. Finally, numerical experiments to check estimates are presented.
The Development of Patient Scheduling Groups for an Effective Appointment System
Authors: Li Huang Yu
Published: January 2016

Patient access to care and long wait times has been identified as major problems in outpatient delivery systems. These aspects impact medical staff productivity, service quality, clinic efficiency, and health-care cost.

This study proposed to redesign existing patient types into scheduling groups so that the total cost of clinic flow and scheduling flexibility was minimized. The optimal scheduling group aimed to improve clinic efficiency and accessibility.

The proposed approach used the simulation optimization technique and was demonstrated in a Primary Care physician clinic. Patient type included, emergency/urgent care (ER/UC), follow-up (FU), new patient (NP), office visit (OV), physical exam (PE), and well child care (WCC). One scheduling group was designed for this physician. The approach steps were to collect physician treatment time data for each patient type, form the possible scheduling groups, simulate daily clinic flow and patient appointment requests, calculate costs of clinic flow as well as appointment flexibility, and find the scheduling group that minimized the total cost.

The cost of clinic flow was minimized at the scheduling group of four, an 8.3% reduction from the group of one. The four groups were: 1. WCC, 2. OV, 3. FU and ER/UC, and 4. PE and NP. The cost of flexibility was always minimized at the group of one. The total cost was minimized at the group of two. WCC was considered separate and the others were grouped together. The total cost reduction was 1.3% from the group of one.

This study provided an alternative method of redesigning patient scheduling groups to address the impact on both clinic flow and appointment accessibility. Balance between them ensured the feasibility to the recognized issues of patient service and access to care. The robustness of the proposed method on the changes of clinic conditions was also discussed.
Modelado y simulación de la cadena de suministro con AnyLogic®
Authors: Andres Beatriz , Sanchis Raquel , Poler Raul
Published: January 2016

En este artículo se presenta una herramienta de software AnyLogic, para el modelado y simulación de la Cadena de Suministro (CS) proporcionando ayuda a la toma de decisiones a través de la simulación de escenarios de un mismo modelo de CS. AnyLogic da soporte a las metodologías de simulación más conocidas: sistemas de eventos discretos, dinámica de sistemas y modelado de agentes. Este artículo se centra en el contexto de dinámica de sistemas permitiendo la simulación de dos tipos de CS: colaborativa y no-colaborativa. Finalmente, se presenta un ejemplo ilustrativo en AnyLogic que permite comparar los dos modelos de CS (i) no-colaborativa  vs. (ii) colaborativa, caracterizada por un modelo de Inventario Administrado por el Proveedor (en inglés Supplier Managed Inventory, SMI), en la que existe colaboración entre el proveedor y el fabricante de la CS.
Coloreando el Álgebra Lineal
Authors: Murillo Arcila Marina , Beltrán Meneu María José
Published: January 2016

En este trabajo se presenta un ejemplo de cómo introducir conceptos  básicos de Álgebra Lineal en un primer curso de Ingeniería a partir del modelo de color RGB basado en la síntesis aditiva de los tres colores de luz primarios rojo, verde y azul. Utilizando este modelo se pretende establecer una conexión entre la obtención de colores por adición y los conceptos matemáticos de espacio vectorial, combinación lineal de vectores y envoltura convexa. Para visualizar esta conexión nos ayudamos del software Geogebra.
Complejidad en el proceso de modelización de una tarea estadística
Authors: Aymerich Restoy Àngels , Albarracín Gordo Lluís
Published: January 2016

En este artículo presentamos un analisis cualitativo del proceso de modelizacion de un grupo de trabajo formado por alumnos de 15-16 años trabajando en una actividad estadística con datos reales.

En concreto, identicamos las fases del proceso de modelizacion siguiendo el ciclo de modelizacion de Blum and LeiB (2007) y discutimos los resultados
desde la perspectiva de las dicultades encontradas durante el analisis y la complejidad del proceso de modelizacion analizado.
Rescate de la magnitud tiempo en el proceso de enseñanza-aprendizaje de las Turbomáquinas Hidráulicas
Authors: Zamora Blas
Published: January 2016

El comportamiento de una Turbomáquina Hidráulica incluye diversos procesos acoplados, en general no instantáneos, que precisan de periodos de tiempo específicos para su completa ejecución. Puesto que una parte relevante del alumnado de Ingeniería presenta una tendencia hacia la bidimensionalidad, evitando las evoluciones temporales, se propone en este trabajo una actuación docente sobre el aprendizaje de los procesos transitorios, rescatando la magnitud tiempo. Se identifican y caracterizan diversos tiempos hidráulicos característicos, que enlazan con los algoritmos de control y simulación de las turbomáquinas. La finalidad es facilitar que el alumno esté en condiciones de aprender significativamente y con capacidad metacognitiva el funcionamiento y el uso del modelo completo de una Central Hidroeléctrica, que Matlab lleva incorporado en una Toolbox de Simulink®
Hacia un nuevo entorno de aprendizaje en la Electrónica de Potencia: de lo virtual a lo personal
Authors: Trujillo Aguilera Francisco David
Published: January 2016

La llegada del Espacio Europeo de Educación Superior conlleva importantes cambios en el proceso de enseñanza/aprendizaje: es conveniente involucrar de forma más efectiva a los alumnos así como promover su independencia y participación activa en este proceso. Este nuevo marco engloba el aumento en el desarrollo y utilización de las Nuevas Tecnologías de la Información y la Comunicación en el campo de la educación y el análisis del resultado académico de los estudiantes. Se describe, a continuación, la implementación de un nuevo entorno de aprendizaje para Electrónica de Potencia. Para evaluar las ventajas e inconvenientes de este nuevo entorno y el cumplimiento de los objetivos, se han diseñado diversos cuestionarios para los estudiantes. Los resultados obtenidos demuestran los beneficios en el uso del nuevo entorno de aprendizaje y un importante aumento en la motivación de los alumnos.
La innovación en la enseñanza de la Geometría Descriptiva. El uso de las herramientas digitales y el estudio de casos reales
Authors: Cabezos-Bernal Pedro M. , Cisneros-Vivó Juan J.
Published: January 2016

La introducción del ordenador en las disciplinas gráficas se va generalizando poco a poco en la mayoría de Escuelas de Arquitectura. Esta comunicación pretende mostrar nuestra experiencia y adaptación de los contenidos al entorno de diseño tridimensional que ofrecen las herramientas de diseño actuales, prestando especial atención a la selección de los casos prácticos que el alumno debe acometer. Cada año planteamos un elenco distinto de modelos arquitectónicos reales que contienen las superficies de estudio, muy alejados de los tradicionales ejercicios abstractos con los que el alumno no lograba percibir su aplicación práctica a la arquitectura. La resolución espacial y el análisis geométrico de las superficies extraídas de los ejemplos  arquitectónicos reales, aumenta el interés y la motivación del alumno por la asignatura, pues éste es capaz de ver rápidamente su aplicabilidad.
Docencia presencial y laboratorio remoto: una unión idónea para las prácticas de motores alternativos
Authors: Navarro Arévalo Emilio , Tizón Pulido Juan Manuel
Published: January 2016

Se ha utilizado en una misma clase presencial recursos docentes convencionales, como son la clase magistral
y las presentaciones en pantalla, junto con un laboratorio remoto para impartir docencia de practicas
de laboratorio de Motores Alternativos de Combustion Interna. En ambos casos se ha hecho uso de
camaras de video para visualizar las instalaciones en tiempo real. La clase magistral se ha utilizado para
describir las instalaciones que forman parte de un banco de ensayos y el laboratorio remoto se ha utilizado
para realizar ensayos para la determinacion de actuaciones de un motor de encendido provocado. Con
esta metodologa se pretende poder solucionar el problema de la masicacion de alumnos en las practicas
de laboratorio, fundamentalmente cuando el numero de puestos de trabajo para hacerlas es muy reducido.
Implantación de metodologías de cálculo a través del lenguaje Python para asignaturas impartidas en las titulaciones de la ETSIN.
Authors: González Gutiérrez Leo Miguel , Cercós Pita Jose Luis , Esteban Burgos Daniel
Published: January 2016

El objetivo de este proyecto es mejorar la eficiencia en los resultados de aprendizaje de los estudiantes, incorporando metodologías activas de aprendizaje como es la programación en el lenguaje Python. Este tipo de iniciativas se espera que favorezcan la interdisciplinariedad y la coordinación curricular de tipo horizontal y vertical.

   También buscamos desarrollar un repositorio de notebooks, recursos docentes, y videos online, que faciliten la experimentación así como el aprendizaje autónomo.
An Examination of Usability of a Virtual Environment for Students Enrolled in a College of Agriculture
Authors: Murphrey Theresa Pesl , Rutherford Tracy A. , Doerfert David L. , Edgar Leslie D. , Edgar Don W.
Published: January 2016

Educational technology continues to expand with multi-user virtual environments (e.g., Second Life™) being the latest technology. Understanding a virtual environment’s usability can enhance educational planning and effective use. Usability includes the interaction quality between an individual and the item being assessed. The purpose was to assess the usability of “AgriCulture Island” in Second Life™ to identify possible issues, understand of the severity of these issues, and how they could be effectively addressed in order to use Second Life™ as a teaching tool. The framework allowed the identification of constructs that further defined usability related to assessing a virtual environment. Both quantitative and qualitative methods were employed including pre/post questionnaires, observations, and a focus group session. The study engaged 12 participants during summer 2012 from a college of agriculture. Findings revealed that participants accepted Second Life™ more after initial exposure. Additionally, participants indicated the experience felt “real” and they could sense others in the environment. Observation data provided a picture of participant interaction with the virtual environment. Elements documented were assistance needs, satisfaction, confusion, and deviation from task. The importance of understanding educational technology usability cannot be underestimated. This study adds to the educational technology literature and provides recommendations for use.
What are the teachers’ experiences when implementing the Curriculum for Agricultural Science Education?
Authors: Lambert Misty D. , Velez Jonathan J. , Elliott Kristopher M.
Published: January 2016

This multiple case study was designed to understand the experience of implementing the Curriculum for Agricultural Science Education (CASE) for five teachers at four high schools. All teachers were in their first year of implementing CASE. Through the use of weekly journals, semistructured interviews and a focus group, researchers attempted to gain insight into how the teachers were implementing CASE as well as their perceptions of the curriculum’s impact on their program and students. Five themes emerged from the study: a) some teachers adapted more easily to the student-centeredness of the curriculum; b) teachers enjoyed having content available, but none of them made it all the way through the material; c) the materials and equipment were essential to the successful implementation of CASE; d) teachers saw attending the CASE training institute as vital to their implementation of the curriculum; and, e) implementing CASE allowed the teachers to refocus. Additionally, researchers used the Concerns Based Adoption Model as a framework for this study and determined each teacher’s level of use, stage of concern and innovation configuration. Recommendations are included for classroom teachers, teacher educators, as well as the CASE developers.
Accessibility and Usage of Technology by North Carolina Agriculture Teachers
Authors: Williams Maegen R. , Warner Wendy J. , Flowers James L. , Croom D. Barry
Published: January 2016

This study examined the integration of technology into the instructional process in North Carolina agricultural education classrooms. The study used survey research methodology to collect information on the availability of instructional technology and the frequency of instructional technology use by North Carolina agriculture teachers. The study found most teachers had access to digital projectors and digital cameras. Agriculture teachers also had convenient access to a teacher desktop computer and teacher laptop computer. The most commonly used software included Internet browsers and software for managing student records. Use of technology by agriculture students was less frequent and commonly consisted of Internet searching and use of reference materials on CD-ROMs. It is recommended the findings of this research study be used to inform future professional development offerings. Also, there should be additional investigation of appropriate learner-centered approaches to technology integration and continued research on the availability and utilization of educational technology in agriculture classrooms over time.
Effects of perch availability on performance, carcass characteristics, and footpad lesions in broilers
Authors: Kiyma Z. , Küçükyılmaz K. , Orojpour A.
Published: January 2016

Abstract. In the modern broiler industry, solutions are still being sought to improve conditions or eliminate problems related to issues such as animal welfare, health, and meat quality brought by intensive production systems. Therefore, this experiment was conducted to study effects of perching on growth performance, carcass characteristics, and footpad lesions (FPLs) in broiler chickens. A total of 300 broiler chicks (Ross 308) were distributed into control and perch groups with three replicates including equal numbers of males and females. The perch group contained two single perches in each pen. Analysis of camera records revealed that on average 7.36 % of the birds using perches. Perch use did not have any effect on growth performance (P  >  0.05), but had a positive effect on FPLs (P  <  0.001). Carcass yield and proportions of carcass parts were not affected by perch availability (P  >  0.05). Thigh and breast meat color was less yellow (P  <  0.005) in the perch group compared to the control group, where breast meat color was more red (P  <  0.01). Birds in the perch group had brighter breast meat (P  <  0.001). The weight of livers in the perch group was lower than in the control group (P  <  0.01). These findings suggest that perch use has positive effect on FPLs. The reduction of redness in the breast could indicate that perch use may have a positive effect on breast inflammation. The potential positive effects of adapting perch use to intensive conditions should be further investigated.