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"Abstract Many people believe renewable energy sources to be capable of substituting fossil or nuclear energy. However there exist very few scientifically sound studies, which apply due diligence to substantiating this impression. In the present paper, the case of photovoltaic power sources in regions of moderate insolation is analysed critically by using the concept of Energy Return on Energy Invested (ERoEI, also called EROI). But the methodology for calculating the ERoEI differs greatly from author-to-author. The main differences between solar PV Systems are between the current ERoEI and what is called the extended ERoEI (ERoEI EXT). The current methodology recommended by the International Energy Agency is not strictly applicable for comparing photovoltaic (PV) power generation with other systems. The main reasons are due to the fact that on one hand, solar electricity is very material-intensive, labour-intensive and capital-intensive and on the other hand the solar radiation exhibits a rather low power density."

"Close Reading and Argument Writing - Authentically Across the Curriculum 7/16/2015 0 Comments Close reading of informational texts and non-fiction articles is not - and should not be - reserved for language arts classes. Every content area would be immensely enhanced if science teachers, social studies teachers, physical education teachers, welding teachers, woodworking teachers (in other words, "all technical subjects," as Common Core states) would not push aside the textbook, but instead embrace it, along with content area and trade articles. Students would then simultaneously learn how to dissect the readings while gaining knowledge in these content areas. What often happens is that teachers feel that students can't handle the text books or can't read the articles independently - and often that is true. However, when teachers instead go into a survival mode, of sorts, and read aloud the whole chapter or article or summarize it with a slideshow, it ends up doing a disservice to students - students are not learning HOW to read these complex texts. They are not learning how to acquire the information on their own. They are not being given the skills to read the sometimes intricate information within a particular content area or even within their possible future trade. They are not being given the opportunity to read, understand, articulate, and discuss or even debate topics within their area of study. Teachers sometimes feel that they can't do these things with students because they are not language arts teachers, or because they don't have time, or simply because they don't know how. Alternatively, a simple solution is to let go of the control and let students do…..with the guidance called close reading. Close reading is a guided reading approach. It is guided because 1) the close reading strategy is reserved for complex texts that are often too high for students to be left with independently and 2) students don't use close reading strateg

Web centrada en una variante de la Indagación que pone el foco en la argumentación. Estrategia que cada vez recibe más atención por su gran potencial en el aprendizaje. "The ADI Instructional Model ADI lab activities consist of the same 8 stages. Each stage is designed to give students an opportunity to participate in one or more science and engineering practices. The stages of ADI are the same for each investigation so students have an opportunity to use the same science and engineering practices, but different disciplinary core ideas and crosscutting concepts to figure out how thing work or why things happen. This instructional approach also gives students an opportunity to learn how to propose, support, evaluate, and revise ideas through discussion and in writing."

"New scientific research is quietly rewriting the fundamentals of economics. The new economic science shows decisively that the age of endlessly growing industrial capitalism, premised on abundant fossil fuel supplies, is over. The long-decline of capitalism-as-we-know-it, the new science shows, began some decades ago, and is on track to accelerate well before the end of the 21st century. With capitalism-as-we-know it in inexorable decline, the urgent task ahead is to rewrite economics to fit the real-world: and, accordingly, to redesign our concepts of value and prosperity, precisely to rebuild our societies with a view of adapting to this extraordinary age of transition."

"Evaporative coolers have been known to purveyors of low-cost, sustainable technologies for years. Without the need for electricity, these cold containers have kept produce fresh from farms to tables, protecting against post-harvest losses in the field and food spoilage in hot pantries worldwide. Now the concept has been applied to air conditioning. Manoj Patel Design Studio in Vadodara, Gujarat (India) has built evaporative air conditioners that can cool a room for days on a single tank of water. The studio designs new products from recycled materials, and they built their air conditioners from ceramics and stone, integrating them with potted plants. By filling rows of ceramic tubes with water, the prototypes maximize their surface area for optimal evaporation while retaining a small footprint. ..."

Cacoo is a user friendly online drawing tool that allows you to create a variety of diagrams such as site maps, wire frames, UML and network charts. Cacoo can be used free of charge.

"Según Kolb, a la hora de aprender se ponen en juego cuatro capacidades diferentes: Capacidad de Experiencia Concreta (EC): ser capaz de involucrase por completo, abiertamente y sin prejuicios en experiencias nuevas. Capacidad de Observación Reflexiva (OR): ser capaz de reflexionar acerca de estas experiencias y de observarlas desde múltiples perspectivas. Capacidad de Conceptualización Abstracta (CA): ser capaz de crear nuevos conceptos y de integrar sus observaciones en teorías lógicamente sólidas. Capacidad de Experimentación Activa (EA): ser capaz de emplear estas teorías para tomar decisiones y solucionar problema David A. Kolb y Roger Fry crearon el conocido como "Círculo del aprendizaje a través de la experiencia". Los autores argumentan que el aprendizaje puede comenzar en cualquiera de los cuatro puntos, aunque los más habitual sea comenzar por una experiencia concreta. Igualmente señalan que más que un círculo, debe entenderse la progresión cognitiva como una espiral que va pasando sucesivamente por cada uno de los cuatro tipos de actividades. Como desarrollo de este modelo, los autores propusieron un cuadro de estilos cognitivos: dado que no era habitual que los distintos individuos fueran igualmente capaces en los cuatro tipos de actividad, podían distinguirse cuatro estilos según sus competencias se inclinasen más por un tipo de actividad u otro."

"Según Kolb, a la hora de aprender se ponen en juego cuatro capacidades diferentes: Capacidad de Experiencia Concreta (EC): ser capaz de involucrase por completo, abiertamente y sin prejuicios en experiencias nuevas. Capacidad de Observación Reflexiva (OR): ser capaz de reflexionar acerca de estas experiencias y de observarlas desde múltiples perspectivas. Capacidad de Conceptualización Abstracta (CA): ser capaz de crear nuevos conceptos y de integrar sus observaciones en teorías lógicamente sólidas. Capacidad de Experimentación Activa (EA): ser capaz de emplear estas teorías para tomar decisiones y solucionar problema David A. Kolb y Roger Fry crearon el conocido como "Círculo del aprendizaje a través de la experiencia". Los autores argumentan que el aprendizaje puede comenzar en cualquiera de los cuatro puntos, aunque los más habitual sea comenzar por una experiencia concreta. Igualmente señalan que más que un círculo, debe entenderse la progresión cognitiva como una espiral que va pasando sucesivamente por cada uno de los cuatro tipos de actividades. Como desarrollo de este modelo, los autores propusieron un cuadro de estilos cognitivos: dado que no era habitual que los distintos individuos fueran igualmente capaces en los cuatro tipos de actividad, podían distinguirse cuatro estilos según sus competencias se inclinasen más por un tipo de actividad u otro."