Sprawl is made possible by highways. This is expensive—in 2015, the Victoria Transport Policy Institute estimated that sprawl costs America more than $1 trillion a year in reduced business activity, environmental damage, consumer expenses, and other costs. Leaving aside the emissions from the 1.1 billion trips Americans take per day (87 percent of which are taken in personal vehicles), spreading everything out has eaten up an enormous amount of natural land.
— Read on slate.com/business/2019/02/green-new-deal-alexandria-ocasio-cortez-flaw-land-use.html
What is Flowcode?
Flowcode allows you to quickly and easily develop complex electronic and electromechanical systems. The graphical programming tool allows those with little experience to develop systems in minutes.
Flowcode is an advanced integrated development environment (IDE) for electronic and electromechanical system development. Engineers—both professional and academic use Flowcode to develop systems for control and measurement based on microcontrollers or on rugged industrial interfaces using Windows compatible personal computers.
Flowcode is perfect for those programming PIC devices including Microchip’s 8bit, 16bit and 32 bit range of microcontrollers. It’s also an easy and effective solution for programming Atmel AVR, Arduino and ARM based devices….
A free version of Flowcode is available which is excellent for learning programming, developing applications at home or for prototyping designs. With no obligation or time limit, this free version can be used to do some really useful projects. For users working in commercial environments or education, professional and academic licences are available through the Flowcode buy pages or by contacting us.
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by Roger » Mon Feb 09, 2009 6:17 pm
Heres a puzzle you may have heard before which you can build as a simple electric circuit. First, the puzzle: a farmer is traveling to market with his cat, a chicken and some corn. He has to cross a river, and the only way to cross is in a small boat which can hold the farmer and just one of the three items he has with him. The problem is, he has to be very careful about what he chooses to leave behind at any time. If the cat and chicken are left alone, the cat will eat the chicken. If the chicken and the corn are left alone, the chicken will eat the corn. To solve the puzzle, you must show how the farmer can get himself and his three items across the river without losing any of them. The goal of this project is to design a simple electrical circuit that follows the puzzle. Youll need a 6 V battery, a flashlight bulb, a bulb holder, some connecting wire, and four toggle switches: 3 SPDT single-pole, double throw and 1 DPDT double-pole, double throw. Each switch represents one of the items: the farmer, the cat, the chicken and the corn you have to figure out which need to be SPDT switches and which one needs to be a DPDT switch. The switches are mounted on a small panel, in a horizontal row representing the river, which you can draw in. Each switch is labeled “Farmer”, “Cat”, “Chicken”, “Corn”. The circuit is to be designed so that if either of the problematic pairs cat-chicken, or chicken-corn are left alone on the same side of the river, the light bulb lights up, indicating an incorrect solution you can add a 6 V buzzer, too, if you like. Since the boat can hold only two items, players can use only two switches per “move”. Irwin Maths book, Wires and Watts: Understanding and Using Electricity has the solution Math, 1981, 67–70, but see if you can figure this one out on your own. The puzzle Ive got figured out but I am stuck on the wiring and cannot find an Irwin Math book.
Self-Repair Manifesto November 9, 2010
Our relationship with our stuff has spiraled out of control. We buy things, use them for a short while, and then rapidly replace them with the next model. It’s time to take a stand. These are our guiding principles.
The challenges for space-based solar include the enormous cost of launching solar panels four square kilometers worth! into space and assembling them; avoiding damage from space debris and meteors; and keeping the power transmission beam locked on its ground-based receiver. That last issue is a security issue as well as an engineering challenge: the proposed satellite would beam energy to Earth using microwaves, and a 1 gigawatt beam, if concentrated, is enough vaporize 500 kilograms of water in a second. That’s the same as vaporizing 5 – 6 adults. The beam will not be that concentrated, but there are still obvious dangers from missing the target. Continue reading
Almost all electricity is produced by turbines which are devices in which moving gas or fluid spins fan blades to turn a generator. The source of the moving gas or fluid may vary—in commercial power plants, it’s usually steam produced by burning fossil fuels or by nuclear energy; in hydroelectric plants, it’s water spilling over a dam; in wind farms, it’s air blowing past the turbines—but the turbine itself is a constant. Anything that causes a gas or fluid to move can be used to spin a turbine and generate electricity.
In the future, that may include ocean currents, including the best-known one—the Gulf Stream. The Gulf Stream is a vast flow of water flowing through the Atlantic Ocean, almost exactly like an enormous river without any banks. And when we say “enormous,” we MEAN “enormous”: 8 billion gallons per minute flow through the gulf stream.