New short link!

quarta-feira, 7 de agosto de 2013

Robot Arduino, OfficePAK, Hidrogénio, e Raízes

Um Robot Arduino pronto-a-correr, é o que agora podem comprar, depois de tantas outras Engenhocas da Arduino...
É bom! 


Arduino announces its first ready-to-roll robot

Ben Coxworth

Arduino has made quite a name for itself over the past several years, with its single-board microcontrollers making their way into a wide variety of DIY electronic devices. Given that many of those devices have been robots, the company has now taken the next logical step forward – it’s released its first-ever complete robot.
Appropriately named the Arduino Robot, the 7 x 4-inch (178 x 102-mm) circular wheeled device utilizes two stacked Arduino boards. The Control Board, which sits on top, reads the various onboard sensors and causes the robot to react as programmed. The Motor Board, on the bottom, controls the motors that drive the two wheels. Two unpowered ball casters located opposite the wheels keep the robot propped up.


 








De manhã, passei pela simpática OfficePAK da Duque de Àvila, e não só se lá encontram os tradicionais Agrafos, e Tesouras, mas também placas de K-Line, Cartão tradicional, e Cabos USB de  ligação PC-Telemóvel, e uma carrada de Material Escolar e afins, incluíndo Materiasis que podem servir para sei lá que amis Engenhocas...

Por exemplo, não sei se lá há, mas podem obter 50 Ìmanes iguais para as vossas Experiências, se comprarem uma simples caixa de Ímanes para Placas de Memos de Escritório.

E como há destas Lojas por todo o lado, vão lá à Duque de Àvila, ou às suas Congéneres:



OFFICE PAK LISBOA AV. DUQUE DE AVILA 92A

Espaço Comercial com todos os artigos para escritórios, material escolar, carimbos, cartoes de visita etc








Uma nova Técnica usa Sol e Água para produzir Hidrogénio, eis algo que promete, usando a Luz Solar concentrada, e Óxidos de Metais:




New technique for turning sunshine and water into hydrogen fuel

Lakshmi Sandhana
 
A new technique developed by a University of Colorado Boulder team converts sunshine and water directly into usable fuel. The technique involves concentrating sunlight in a solar tower to achieve temperatures high enough to drive chemical reactions that split water into its constituent oxygen and hydrogen molecules. In this way, the team says it should be able to cheaply produce massive amounts of hydrogen fuel.
The team's solar thermal system concentrates sunlight off a vast array of mirrors into a single point at the top of a tall tower to produce very high temperatures. When this heat is delivered into a reactor full of metal oxides, the oxides heat up and release oxygen. The reduced metal oxide now gains a chemical composition that makes it ready to bind with oxygen atoms. Introducing steam into the reactor, which can also be produced by heating water with sunlight, causes the compound to draw oxygen atoms out of the water molecules, leaving behind hydrogen molecules that can be collected as hydrogen gas.











Arrancar Raízes de Plantas daninhas, é uma dor-de-dentes, sei, que já vi fazer, olá, Lopes, mas agora, parece que vai ser menos difícil, e mais intuítivo:




Ring Weeder gets to the root of the manual weeding problem
Dave LeClair
Removing weeds can be annoying, especially in an area with a lot of plants. Ring Weeder slips over the user's index finger and allows for precision weed pulling all the way down to the root.
When taking a hands-on approach to weeding, the challenge is to make sure that the pesky invader is pulled all the way out, root intact. If it's not a clean extraction, there's a very good chance that the weed will just grow back and you'll have to try again.
Ring Weeder is worn like a ring over the gardening glove, and has a forked end that the gardener sticks in the ground behind the weed. The offending plant and root are then removed with a smooth dig and lift motion. It's a simple tool, but one that could prove to be a time saver for anyone who does a lot of gardening





Sem comentários:

Enviar um comentário