Manufacturers need to understand the requirements of the RoHS Directive to ensure that their products, and their components, comply.
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In computer networking, the protocols of the Transport Layer of the Internet Protocol Suite, most notably the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP), but also other protocols, use a numerical identifier for the data structures of the endpoints for host-to-host communications. Such an endpoint is known as a port and the identifier is the port number. The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses.[1]
Tema 2: Semiconductores
Tema 3: El diodo de unión
Tema 4: Circuitos con diodos
Tema 5: Diodos para aplicaciones especiales
Tema 6: El transistor de unión bipolar BJT
Tema 7: Fundamentos de los transistores bipolares
Tema 8: Polarización y estabilización del transistor bipolar
Autor: Andrés Aranzabal Olea
Director de proyecto: Carmelo Alonso González
e-mail de contacto: jtpalgoc@sb.ehu.es
The Official Release of Slackware Linux by Patrick Volkerding is an advanced Linux operating system, designed with the twin goals of ease of use and stability as top priorities. Including the latest popular software while retaining a sense of tradition, providing simplicity and ease of use alongside flexibility and power, Slackware brings the best of all worlds to the table.
Originally developed by Linus Torvalds in 1991, the UNIX®-like Linux operating system now benefits from the contributions of millions of users and developers around the world. Slackware Linux provides new and experienced users alike with a fully-featured system, equipped to serve in any capacity from desktop workstation to machine-room server. Web, ftp, and email servers are ready to go out of the box, as are a wide selection of popular desktop environments. A full range of development tools, editors, and current libraries is included for users who wish to develop or compile additional software.
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Las lenguas cambian de continuo, y lo hacen de modo especial en su componente léxico. Por ello los diccionarios nunca están terminados: son una obra viva que se esfuerza en reflejar la evolución registrando nuevas formas y atendiendo a las mutaciones de significado.
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AllPinouts is a Web-based free content project to collect and list all known pinouts.
Pinout or pin-out is a term used in electronics to describe how an electrical cable is wired, or the function of each wire (pin) in a connector.
AllPinouts collects information about hardware interfaces of modern and obsolete hardware, including pinouts of ports, expansion slots, and other connectors of computers and different digital devices (i.e. Cellular Phones, GPS, PDA, Game Consoles, etc.). This website is a Wiki, a website which the users (you) easily can contribute to and improve. All text is available under the GNU Free Documentation License (GFDL) and may be distributed or linked accordingly.
Content of this site is a result of collective work. Something left uncovered? You are welcome to add information, correct existing documents, add explanations and fix errors, simply by clicking the edit link that appears on top of pages when you are logged in.
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por : Juan Ranchal: 30 Nov 2008, 14:07
Una solución estándar y abierta al resto de la industria, que gestionaría con un teléfono móvil o desde cualquier navegador web, todos los aparatos eléctricos-electrónicos del hogar con una interfaz de usuario unificada.
Ambicioso proyecto el de Nokia con su Home Control Center , plataforma basada en Linux que soporta la mayor parte de tecnologías existentes para “hogares inteligentes”, permitiendo la incorporación de patentes y permitiendo a terceros desarrolladores crear sus propias soluciones y servicios.
Nokia ofrece a los fabricantes la documentación completa de las APIs -el conjunto de funciones y procedimientos que gobiernan el sistemas- y soporte para desarrolladores y fabricantes que quieran integrar sus productos en el marco de la plataforma propuesta por el gigante finlandés del móvil.
Fuente: theinquirer.es
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por : Juan Ranchal: 30 Nov 2008, 11:12
Es el proyecto de Pixel Qi, nueva compañía de la que fuera responsable de la división de pantallas en Intel y CTO del OLPC, Mary Lou Jepsen, que asegura que dicha tecnología estaría disponible a finales de 2009.
Una única recarga para autonomías de 20 a 40 horas es el sueño de todo el que tenga un ordenador portátil. La eficiencia energética de la pantalla de visualización es crítica para conseguir este objetivo, al ser el componente que más castiga las baterías.
Uno de los fundamentos del XO del proyecto “un portátil por niño” fue el uso de pantallas de visualización de bajo coste sumado a un consumo energético muy inferior al tradicional.
¿Y cómo trasladar este ahorro a equipos más potentes? En Pixel Qi aseguran que están probando tecnología propia que va más allá de las pantallas del OLPC. “Estamos trabajando con varios modelos de portátiles y e-book que alargará la autonomía de las baterías entre 5 y 10 veces”.
Pixel Qi espera poder trasladar esta tecnología a los equipos en la segunda mitad de 2009, manteniendo costes, ya que este tipo de pantallas con grosores de hasta un milímetro, utilizan materiales que usan actualmente en la línea de fabricación de LCDs.
vINQulos
Yahoo! Tech
Fuente: theinquirer.es
Not every country measures oil in barrels, but that particular measurement is still popular in the United States, which means it remains in the public vernacular even if it has largely lost its significance in a mostly metric world economy. At one point in history, oil producers did store oil in barrels, although the size and nature of those barrels were far from standardized.
When the first oil fields were tapped in Pennsylvania during the 1860s, there were no steel 55 gallon drums in which to store the oil. Instead, the oil was pumped into whatever containers could be found, including pickle barrels, cracker barrels and whiskey barrels. There was no standard size oil barrel as such, but eventually the wooden whiskey barrel became the most popular storage container to hold crude oil until it could be shipped to refiners.
The standard whiskey barrel of the times held approximately 42 gallons of liquid. Early oil producers wanted to insure their customers received every last drop they ordered, so they actually overfilled the barrels to 44 gallons. This 44 US gallon mark became the standard measurement of oil in barrels produced in American oil wells. The measurement of a barrel of oil in other countries was closer to 55 Imperial gallons.
Eventually the wooden whiskey barrels gave way to steel drums which provided more protection against leakage and contamination. Although these steel drums were designed to hold 55 gallons of oil, the standard 44 US gallon barrel is still considered to be the correct legal measurement of oil in barrels. When oil producers or economist speak of the number of barrels of oil produced in Saudi Arabia per day, for example, they are applying an American measurement, not one the Saudis themselves might use.
The reason other oil-producing countries rarely use the term "barrels" to measure their production rates is because they rarely store their products in actual barrels anymore. The oil pumped out of the ground is more commonly transported in large tanker trucks or through elaborate pipelines directly to the refineries, or massive cargo ships for overseas delivery.
Individual companies may store oil in barrels, but the largest commercial oil producers rarely do unless the product is going to be shipped to a remote location, such as a military base or third world countries without storage facilities. It is far more likely to see a derivative of crude oil, such as gasoline or kerosene, actually stored in steel drums or barrels.
Therefore, the reason we measure oil in barrels is mostly to provide a familiar reference for those who grew up with images of actual oil-filled barrels rolling down a conveyor belt. In reality, only a percentage of a barrel of oil is converted to gasoline or petrol, so a number such as 1,000,000 barrels of crude oil does not necessarily translate to a surplus supply of gasoline. It only refers to the number of gallons of raw crude produced that day, not how much has been refined into various petroleum products.
Fuente: http://www.wisegeek.com/
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