Actitudes generalizadas sobre la enseñanza de la matemática en el nivel medio

El siguiente estudio se enmarca en el dominio afectivo matemático, realizando un análisis de las actitudes, creencias y nivel de pensamiento de dos poblaciones específicas: una población de estudiantes activos cuyas edades oscila entre los 15 y 18 años y, una población de personas adultas que en algún momento estudiaron el bachillerato. Se concluye que ambas poblaciones presentan actitudes similares hacia la matemática escolar y existe una posible relación entre los dominios cognitivo-afectivo

Organizational and Team Culture as Antecedents of Protection Motivation Among IT Employees

The rapid development of technology and information systems has led to higher information security-related issues in an organization. The age of remote working (i.e., telecommuting) has further increased information security related incidents that need to be adequately addressed. This paper extends the protection motivation theory by drawing insights from organizational and institutional theory literature to examine how organizational culture and subcultures such as team culture impact information security compliance. The primary objective of this study is to understand the impact of the dimensions of organizational culture and team culture on employees’ perceived threats and coping motivation associated with information security compliance. The study applied structural equation modeling to analyze survey responses of 341 IT employees in the United States. The result of the study indicates that both organization and team culture impacts employees’ perception to appraise threat and coping, which in turn impacts behavioral intention to comply with information security policies. The findings of this study con- tribute to the information security compliance research by demonstrating the importance of developing an information security culture within an organization and its subgroups

The age–metallicity relationship in the Fornax spheroidal dwarf galaxy

We produce a comprehensive field star age–metallicity relationship (AMR) from the earliest epoch until ∼1 Gyr ago for three fields in the Fornax dwarf spheroidal galaxy by using VI photometric data obtained with FORS1 at the VLT. We find that the innermost one does not contain dominant very old stars (age > 12 Gyr), whereas the relatively outer field does not account for representative star field populations younger than ∼3 Gyr. When focusing on the most prominent stellar populations, we find that the derived AMRs are engraved by the evidence of an outside-in star formation process. The studied fields show bimodal metallicity distributions peaked at [Fe/H] = (−0.95 ± 0.15) dex and (−1.15 or −1.25 ± 0.05) dex, respectively, but only during the first half of the entire galaxy lifetime. Furthermore, the more metal-rich population appears to be more numerous in the outer fields, while in the innermost Fornax field the contribution of both metallicity populations seems to be similar. We also find that the metallicity spread ∼6 Gyr ago is remarkable large, while the intrinsic metallicity dispersion at ∼1–2 Gyr results smaller than that for the relatively older generations of stars. We interpret these outcomes as a result of a possible merger of two galaxies that would have triggered a star formation bursting process that peaked between ∼6 and 9 Gyr ago, depending on the position of the field in the galaxy.Fil: Piatti, Andres Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Cordoba. Observatorio Astronomico de Cordoba; ArgentinaFil: del Pino, Andres. Instituto de Astrofısica de Canarias. Tenerife; EspañaFil: Aparicio, Antonio. Instituto de Astrofısica de Canarias. Tenerife; España. Universidad de la Laguna; EspañaFil: Hidalgo, Sebastian L. Instituto de Astrofısica de Canarias. Tenerife; Españ

Glyphosate and AMPA concentrations in wind-blown material under field conditions

Agricultural intensification in fragile arid and semiarid environments has led to an increase in soil degradation, mainly through wind erosion. Argentina is an agricultural and cattle-farming country, which has increased its productivity in the last few decades, widening the boundaries of farm land and the use of herbicides to control weeds. Glyphosate, which accounts for 65% of the Argentinian pesticides market, is strongly retained in soil. The World Health Organization concluded that there was evidence to classify glyphosate as ‘probably carcinogenic to humans.’ In this context, the objective of this study was to determine the presence and concentration of glyphosate and aminomethylphosphonic acid (AMPA) in wind-blown material in 3 areas in Argentine semiarid regions (Chaco, La Pampa, and San Luis). In 1-ha2 plots, left uncovered and levelled, the wind-blown material was collected at heights of 13.5, 50, and 150 cm during 18 erosion events. The wind-blown material carried by the wind at a height of 150 cm had concentrations of 247 and 218 μg kg−1 of glyphosate and AMPA, respectively. This material was enriched 60 times in glyphosate and 3 times in AMPA as compared with the original soil. This shows that the eroded material can, potentially, have a negative impact on the ecosystem and also on human health, depending on the proportion of this material released into the atmosphere in suspension as particulate matter. This study is, to our knowledge, the first to report concentrations of glyphosate and AMPA in wind-blown material under field conditions.Fil: Aparicio, Virginia Carolina. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Buenos Aires Sur. Estación Experimental Agropecuaria Balcarce; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Aimar, Silvia Beatriz. Universidad Nacional de La Pampa. Facultad de Agronomía; ArgentinaFil: de Gerónimo, Eduardo. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Buenos Aires Sur. Estación Experimental Agropecuaria Balcarce; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Mendez, Mariano Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias de la Tierra y Ambientales de La Pampa. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales. Instituto de Ciencias de la Tierra y Ambientales de La Pampa; ArgentinaFil: Costa, Jose Luis. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Buenos Aires Sur. Estación Experimental Agropecuaria Balcarce; Argentin

Crear valor por medio del emprendimiento estratégico.

En el artículo se pretende definir el concepto de emprendimiento estratégico y de emprendimiento corporativo, de modo que se entienda lo que significa emprender y aprovechar las oportunidades que nos brinda el entorno en que se desarrolla la organización y resaltar la importancia de las mismas.De igual modo para lograr la creación del valor estratégico de la organización se debe tener claramente internalizado los conceptos de inventiva, innovación y de la imitación, de manera de poder describir la relación existente entre ellas.Definir quienes son emprendedores y quienes realmente poseen una mentalidad emprendedora de manera de poder volcarla a la organización en donde se desempeñan. Tratar que se entienda cómo las empresas desarrollan las innovaciones en su cadena de valor para proyectarse a realizar emprendimientos internacionales.Por último, tratar de explicar cómo el emprendimiento estratégico ayuda a las empresas a crear valor.AbstractIn the article we define the concept of strategic entrepreneurship and corporate entrepreneurship, so that they understand what it means to take and seize the opportunities afforded us by the environment in which the organization develops and highlight the importance of them.Similarly to achieve the creation of the strategic value of the organization must have clearly internalized the concepts of invention, innovation and imitation, so as to describe the relationship between them.Define who are entrepreneurs and those who actually have an entrepreneurial mindset so that they could be written to the organization where they work.Trying to understand how firms develop innovations in its value chain to project to make international ventures.Finally, try to explain how strategic entrepreneurship helps companies to create value.Key Words: Value ; Entrepreneurship ; Strategy ; Busines

Manejo mediante gestos faciales de una aplicación para la programación en Java para personas con diversidad funcional

[ES] La programación en computadoras requiere generalmente del uso de pantallas, teclados o ratones para ver el código implementado o para ingresar nuevo código. Sin embargo, estos dispositivos a menudo no son adecuados ni cómodos para personas con diversidad funcional. Por ello, en este trabajo se va a realizar el desarrollo del reconocimiento de gestos faciales para el manejo de COPS, entorno de desarrollo software en Eclipse que facilita la programación a usuarios con diversidad funcional. Esto se conseguirá mediante la localización de los puntos más significativos de la cara de una persona (puntos en los ojos, cejas, contorno de la mandíbula, nariz, boca, etc.) con el objetivo de, a través del movimiento y las distancias entre estos, entrenar modelos correspondientes a cada gesto facial. Estos modelos servirán para posteriormente reconocer qué gesto es el que el usuario está realizando a través de la cámara y, de la misma manera, cuál es la funcionalidad de la aplicación que se desea poner en marcha. Con esto se conseguirá el objetivo de que cualquier usuario, sin exclusiones, pueda disfrutar de este gran mundo de la programación sin ningún tipo de dificultad ni inconveniente.[EN] Computer programming generally requires the use of screens, keyboards or mice to view the implemented code or to enter new code. However, these devices are often not suitable or comfortable for people with functional diversity. For this reason, in this work, the development of facial gesture recognition for the management of COPS, a software development environment in Eclipse which facilitates programming for users with functional diversity, will be carried out. This will be achieved by locating the most significant points on human's face (points on the eyes, eyebrows, jaw, nose, mouth, etc.) with the aim of, with the movement and the distances between these train models corresponding to each facial gesture. These models will serve to recognize which gesture the user is performing through the camera and, in the same way, which is the function of the application to be launched. With this, the main goal will be achieved, which is that any user, without exclusions, can enjoy this great world of programming without any kind of difficulty or inconvenience.[CA] La programació en computadores requereix generalment de l'ús de pantalles, teclats o ratolins per a veure el codi implementat o per a ingressar nou codi. No obstant això, aquests dispositius sovint no són adequats ni còmodes per a persones amb diversitat funcional. Per això, en aquest treball es realitzarà el desenvolupament del reconeixement de gestos facials per al maneig de COPS, entorn de desenvolupament de programari en Eclipse que facilita la programació a usuaris amb diversitat funcional. Això s'aconseguirà mitjançant la localització dels punts més significatius de la cara d'una persona (punts en els ulls, celles, contorn de la mandíbula, nas, boca, etc.) amb l'objectiu de, a través del moviment i les distàncies entre aquests, entrenar models corresponents a cada gest facial. Aquests models serviran per a posteriorment reconéixer quin gest és el que l'usuari està realitzant a través de la càmera i, de la mateixa manera, quina és la funcionalitat de l'aplicació que es desitja posar en marxa. Amb això, s'aconseguirà l'objectiu de que qualsevol usuari, sense exclusions, puga gaudir d'aquest gran món de la programació sense cap mena de dificultat ni inconvenient.Aparicio Alonso, E. (2021). Manejo mediante gestos faciales de una aplicación para la programación en Java para personas con diversidad funcional. Universitat Politècnica de València. http://hdl.handle.net/10251/172818TFG

Obtención de urania sinterizable para elementos combustibles

Tesis inédita de la Universidad de Madrid, Facultad de Ciencias, Sección de Químicas , leída el 17 de julio de 1969.Universidad de MadridTRUEProQuestpu

Pulse interspersing in static multipath chip environments for Impulse Radio communications

Communications are becoming the bottleneck in the performance of Chip Multiprocessor (CMP). To address this issue, the use of wireless communications within a chip has been proposed, since they offer a low latency among nodes and high reconfigurability. The chip scenario has the particularity that is static, and the multipath can be known a priori. Within this context, we propose in this paper a simple yet very efficient modulation technique, based on Impulse Radio-On–Off-Keying (IR-OOK), which significantly optimizes the performance in Wireless Network-on-Chip (WNoC) as well as off-chip scenarios. This technique is based on interspersing information pulses among the reflected pulses in order to reduce the time between pulses, thus increasing the data rate. We prove that the final data rate can be considerably increased without increasing the hardware complexity of the transceiver.Peer ReviewedPostprint (published version

Life history traits of Sirex noctilio F. (Hymenoptera: Siricidae) can explain outbreaks independently of environmental factors

The woodwasp Sirex noctilio is a major pest of pine plantations worldwide. Economically significant damage is however limited to outbreak populations. To understand what determines outbreaks dynamics in this species, we developed an individual based model for a wasp population developing within a pine plantation. We show that outbreaks may be the result of the insect's life history. Specifically we show that limited dispersal may not only increase population persistence but also create the conditions for eruptive dynamics. When the probability of long distance dispersal is greater than zero, but relatively small (PLDD= 0.1) large outbreaks are the norm, with all of the suitable trees dead at the end of the simulation. For PLDD= 0 (only local dispersal allowed) outbreaks are smaller in size, and in some cases not well defined and spread over longer periods. For PLDD= 1 (only long distance dispersal allowed), the frequency of local population extinction (without outbreaks) increases significantly. Aggregated attacks may induce physiological changes in the trees which could allow other wasps to detect them. These changes may in turn trigger an outbreak. In contrast, healthy, vigorous trees are not suitable for wasp oviposition. In our model the density of suitable trees (healthy trees but yet suitable for oviposition) are a key factor determining population persistence before outbreaks. From an applied perspective, our results emphasize the importance of adequate plantation management in preventing woodwasp infestation.Centro de Estudios Parasitológicos y de Vectore

Life history traits of Sirex noctilio F. (Hymenoptera: Siricidae) can explain outbreaks independently of environmental factors

The woodwasp Sirex noctilio is a major pest of pine plantations worldwide. Economically significant damage is however limited to outbreak populations. To understand what determines outbreaks dynamics in this species, we developed an individual based model for a wasp population developing within a pine plantation. We show that outbreaks may be the result of the insect's life history. Specifically we show that limited dispersal may not only increase population persistence but also create the conditions for eruptive dynamics. When the probability of long distance dispersal is greater than zero, but relatively small (PLDD= 0.1) large outbreaks are the norm, with all of the suitable trees dead at the end of the simulation. For PLDD= 0 (only local dispersal allowed) outbreaks are smaller in size, and in some cases not well defined and spread over longer periods. For PLDD= 1 (only long distance dispersal allowed), the frequency of local population extinction (without outbreaks) increases significantly. Aggregated attacks may induce physiological changes in the trees which could allow other wasps to detect them. These changes may in turn trigger an outbreak. In contrast, healthy, vigorous trees are not suitable for wasp oviposition. In our model the density of suitable trees (healthy trees but yet suitable for oviposition) are a key factor determining population persistence before outbreaks. From an applied perspective, our results emphasize the importance of adequate plantation management in preventing woodwasp infestation.Centro de Estudios Parasitológicos y de Vectore