Group items tagged

"In this Instructable, I'm going to be showing you how to build your own crack the code game in which you use a rotary encoder dial to guess the randomly generated code to the safe. There are 8 LEDs on the front of the safe to tell you how many of the digits you've guessed are correct and how many are in the right place as well. The safe is initially open, allowing you to put something into the inside compartment. The Arduino and battery are housed in a separate compartment in the back. You then push the dial to lock the safe, which is done using a servo on the inside of the door. You then need to input the code by turning the dial to select the digits and pushing the dial to confirm each digit. After your fourth digit is chosen, the safe displays how many of your digits are correct and how many of them are in the correct place using the red and green LEDs on the door. "

"Back in the 1980s, a group of social workers in Jamaica visited low-income homes one hour a week for two years, bearing age-appropriate toys for the kids and advice on child rearing for the parents. Researchers tracked the outcomes, and a generation later, the results are in. The children whose homes were visited by social workers became adults who earn wages that are 25 percent higher than those earned by peers who had not been visited. Their I.Q.s are an average seven points higher, and they are less likely to resort to crime or suffer from depression. Other studies, including several recent ones in the United States, have shown similar results, contributing to a consensus on the importance of early childhood development that has led governments around the world to increase spending on the first five years of life. In Latin America and the Caribbean, a region of longstanding social and economic inequality, several countries have been especially ambitious. Brazil and Chile doubled the coverage of day care services over the past decade, while in Ecuador they grew sixfold. These investments build on historic gains in child nutrition and health. But while Latin American children are now healthier and more likely to attend preschool, they still lag far behind in learning, particularly in the areas of language and cognition, when compared with their counterparts in wealthy countries. What are we doing wrong? ..."

"Back in the 1980s, a group of social workers in Jamaica visited low-income homes one hour a week for two years, bearing age-appropriate toys for the kids and advice on child rearing for the parents. Researchers tracked the outcomes, and a generation later, the results are in. The children whose homes were visited by social workers became adults who earn wages that are 25 percent higher than those earned by peers who had not been visited. Their I.Q.s are an average seven points higher, and they are less likely to resort to crime or suffer from depression. Other studies, including several recent ones in the United States, have shown similar results, contributing to a consensus on the importance of early childhood development that has led governments around the world to increase spending on the first five years of life. In Latin America and the Caribbean, a region of longstanding social and economic inequality, several countries have been especially ambitious. Brazil and Chile doubled the coverage of day care services over the past decade, while in Ecuador they grew sixfold. These investments build on historic gains in child nutrition and health. But while Latin American children are now healthier and more likely to attend preschool, they still lag far behind in learning, particularly in the areas of language and cognition, when compared with their counterparts in wealthy countries. What are we doing wrong? ..."

"UnoArduSim es un software que simula en la pantalla de nuestro ordenador una placa Arduino Uno y otros dispositivos habituales de entrada y salida. Incluye motores de corriente continua y servomotores, buses de comunicación serie RS232, I2C, SPI, generador de ondas analógicas y digitales, altavoz piezoeléctrico, LEDs, pulsadores, resistencias pull-ups y pull-downs, potenciómetros deslizantes, panel de seguimiento de las variables del programa y un osciloscopio virtual para la visualización de señales de salida analógicas y digitales."

""El colapso ya está sucediendo, aunque no seamos muy conscientes de ello" Enric Llopis Rebelión La función de la energía en el devenir histórico y la noción de colapso son dos de los argumentos centrales del libro "En la espiral de la energía", de Ramón Fernández Durán y Luis González Reyes. Coeditado por Ecologistas en Acción y Baladre, el texto de cerca de mil páginas y dos volúmenes constituye un trabajo enciclopédico que comienza en las "sociedades opulentas" del Paleolítico y termina en el colapso del sistema urbano agro-industrial civilizatorio. El colapso, noción muy vinculada a la idea de complejidad, "ya está sucediendo aunque no seamos muy conscientes de ello; desde el punto de vista de nuestras vidas, el colapso será relativamente lento, aunque en términos históricos sea muy rápido", afirma Luis González Reyes. El autor, miembro de Ecologistas en Acción, también forma parte de Garúa, cooperativa en la que trabaja en cuestiones de formación, intervención social e investigación. En FUHEM colabora para la inclusión de los temas ecosociales en el proceso de aprendizaje de los alumnos de tres colegios. González Reyes es además autor de "Sostenibilidad ambiental: un bien público global" (Akal) y "La política ambiental de la Unión Europea" (Ecologistas en Acción). Ha colaborado en "¿Qué hacemos frente a la crisis ecológica?" (Akal) con Jorge Riechmann, Yayo Herrero y Carmen Madorrán. -¿Qué es el Antropoceno? ¿Cuándo surge el concepto y qué quiere significarse con el mismo? El Holoceno, la etapa histórica que coincide con el inicio de la agricultura (los últimos 12.000 años), ha tocado a su fin, ya hay una nueva era geológica: el Antropoceno. El término Antropoceno fue acuñado por Crutzen en 2000. Además, la Sociedad Geológica de Londres así ha definido a esta etapa de la historia terrícola. Una sola especie, la especie humana, o mejor dicho, una élite de ella (en ese sentid

"hoy vamos a hacer una práctica con Arduino y un LDR ( un sensor de luz) y para ponerle un poco de sazón a la táctica vamos a utilizar este sensor para decodificar señales lumínicas enviadas desde un dispositivo Android, en código Morse. De modo que además de conocer cómo podemos conectar y programar Arduino para utilizar este tipo de sensores LDR, también vamos a divertirnos un rato enviando texto a través de el led de un dispositivo Android en código Morse y Arduino lo va a decodificar y a mostrar el texto en el display LCD de 16×2."

"Drained fertile peatlands around the globe are hotspots for the atmospheric emission of laughing-gas -- a powerful greenhouse gas called nitrous oxide, which is partly responsible for global warming and destruction of the ozone layer, a new study shows. Research into natural peatlands such as fens, swamps and bogs, as well as drained peatlands, found that either draining wet soils or irrigating well drained soils boosts the emission of nitrous oxide significantly. Led by researchers at the University of Birmingham and the University of Tartu, Estonia, the study took in 58 peatland sites around the world. These included locations in the United States, Australia, Brazil, South America, Australia, New Zealand, East Africa, Southeast Asia, Siberia and Europe."

"Carbon dioxide (CO2) is a gas essential for life- animals exhale it, plants sequester it. It exists in Earth's atmosphere in comparably small concentrations, but is vital for sustaining life. CO2 is termed a greenhouse gas (GHG) - a gas which absorbs and emits thermal radiation creating the 'greenhouse effect'. Along with other greenhouse gases, such as nitrous oxide and methane, CO2 is important in sustaining a habitable temperature for the planet: if there were absolutely no GHGs, our planet would be simply too cold. It has been estimated that without these gases, the average surface temperature of the Earth would be about -18 degrees celcius.1 Since the Industrial Revolution, however, energy-driven consumption of fossil fuels has led to a rapid increase in emissions of CO2, disrupting the global carbon cycle and leading to a planetary warming impact. As an international community, UN member parties have set a target of limiting average warming to 2 degrees celcius above pre-Industrial temperatures."

"Our core ecological problem is not climate change. It is overshoot, of which global warming is a symptom. Overshoot is a systemic issue. Over the past century-and-a-half, enormous amounts of cheap energy from fossil fuels enabled the rapid growth of resource extraction, manufacturing, and consumption; and these in turn led to population increase, pollution, and loss of natural habitat and hence biodiversity. The human system expanded dramatically, overshooting Earth's long-term carrying capacity for humans while upsetting the ecological systems we depend on for our survival. Until we understand and address this systemic imbalance, symptomatic treatment (doing what we can to reverse pollution dilemmas like climate change, trying to save threatened species, and hoping to feed a burgeoning population with genetically modified crops) will constitute an endlessly frustrating round of stopgap measures that are ultimately destined to fail."

"With little water, scorching temperatures, and not much arable land, the UAE currently imports 80% of its food. Can it go local? In an industrial park built off a highway in the arid land between Abu Dhabi and Dubai, a sprawling new indoor farm will soon grow tomatoes under LED lights in a climate-controlled warehouse near a plastic production facility and other factories. The farm, the first in the world to commercially grow tomatoes solely under artificial light, is one part of a push to transform food production in the United Arab Emirates, where 80% of food is imported. The government realizes that to be resilient, it will need to find new ways to grow food in a desert climate with little rain and temperatures that regularly stay above 100 degrees."

Ambicioso proyecto de educación estadounidense sobre el clima, energía y educación ambiental. The Climate Literacy and Energy Awareness Network (CLEAN) Portal was launched in 2010 as a National Science Digital Library (NSDL) Pathways project. It is led by the science education expertise of the Cooperative Institute for Research in Environmental Science (CIRES) at the University of Colorado Boulder and the Science Education Resource Center (SERC) at Carleton College. As of 2012, CLEAN has been syndicated to NOAA's climate.gov portal. CLEAN's primary effort is to steward the collection of climate and energy science educational resources and to support a community of professionals committed to improving climate and energy literacy. The three key components of the CLEAN project are: The CLEAN Collection of Climate and Energy Science resources- high-quality, digital resources---including learning activities, visualizations, videos, and short demonstrations/experiments---geared toward educators of students in secondary through undergraduate levels. Guidance in Teaching Climate and Energy Science pages designed to help educators understand and be equipped to teach the big ideas in climate and energy science. The CLEAN Network a community of professionals committed to improving climate and energy literacy.

"El conocimiento liberado de patentes, con apoyo del Estado y una academia conectada con las necesidades de la industria, puede facilitar el desarrollo tecnológico local."