Système canadien de référence spatiale - Calcul inverse géodésique Démonstration en ligne News: CGVD2013 is now available! Natural Resources Canada has released the Canadian Geodetic Vertical Datum of 2013 (CGVD2013), which is now the new reference standard for heights across Canada. This new height reference system is replacing the Canadian Geodetic Vertical Datum of 1928 (CGVD28), which was adopted officially by an Order in Council in 1935. Geodetic reference systems stem from the need to provide a consistent and integrated reference surface for data analysis. This site provides end-users with the geodetic data and tools they need for a range of commercial and private uses. Date modified:
learn about the 555 The 555 Integrated Circuit (IC) is an easy to use timer that has many applications. It is widely used in electronic circuits and this popularity means it is also very cheap to purchase, typically costing around 30p. A 'dual' version called the 556 is also available which includes two independent 555 ICs in one package. For the 555 to function it relies on both analogue and digital electronic techniques, but if we consider its output only, it can be thought of as a digital device. The output can be in one of two states at any time, the first state is the 'low' state, which is 0v. The second state is the 'high' state, which is the voltage Vs (The voltage of your power supply which can be anything from 4.5 to 15v. 18v absolute maximum). Monostable mode: in this mode, the 555 functions as a "one-shot".
ETH - IDSC - Flying Machine Arena The Flying Machine Arena (FMA) is a portable space devoted to autonomous flight. Measuring up to 10 x 10 x 10 meters, it consists of a high-precision motion capture system, a wireless communication network, and custom software executing sophisticated algorithms for estimation and control. The motion capture system can locate multiple objects in the space at rates exceeding 200 frames per second. While this may seem extremely fast, the objects in the space can move at speeds in excess of 10 m/s, resulting in displacements of over 5 cm between successive snapshots. This information is fused with other data and models of the system dynamics to predict the state of the objects into the future. The system uses this knowledge to determine what commands the vehicles should execute next to achieve their desired behavior, such as performing high-speed flips, balancing objects, building structures, or engaging in a game of paddle-ball.
Holding Power of Nails Please ensure you have JavaScript enabled in your browser. If you leave JavaScript disabled, you will only access a portion of the content we are providing. <a href="/science-fair-projects/javascript_help.php">Here's how.</a> *Note: This is an abbreviated Project Idea, without notes to start your background research, a specific list of materials, or a procedure for how to do the experiment. You can identify abbreviated Project Ideas by the asterisk at the end of the title. Abstract How strongly do different types of nails hold in wood? Share your story with Science Buddies! I Did This Project! Last edit date: 2013-01-10 Bibliography Hess, J.R., 2006, personal communication. Ask an Expert The Ask an Expert Forum is intended to be a place where students can go to find answers to science questions that they have been unable to find using other resources. Ask an Expert Related Links If you like this project, you might enjoy exploring these related careers: Materials Scientist and Engineer
programming languages - Need some ignition for learning Embedded Systems Weller Magnastat Autopsy and Repair » Code and Life Immediately after soldering together my USB password thingy, my solder iron, the family heirloom Weller Magnastat stopped working. Some investigation showed that the base station was providing 24V AC voltage just fine, so I decided to unassemble the handpiece to see if something could be done. Here’s what I found: It turned out my iron was salvageable; read on to learn a bit about the Magnastat and how I was able to repair mine. Magnastat basics The construction of the device is surprisingly simple (see this image): The first (blue) wire from A/C power unit goes straight to the heating element (first red wire with black tube around it). A long tube goes “out” the handle part into the iron tip, and the tip is placed at the head. Note that in my model the tip and the magnastat are one solid piece (magnastat is in the base of the tip), newer models have a separate magnastat and tip, and you can change the target temperature just by changing the magnastat part. Reviving the old Weller
Build Your Own Lenses Nikon, Canon, Leica, Pentax, Sigma, Tokina, and a host of other lens makers are all striving to bring you the sharpest lenses with all optical aberrations reduced to the minimum. That’s too bad! Because with lenses, as with life, sometimes it’s the imperfections that make things interesting. The image on the left was shot with the imperfect optics of a homemade lens. There are two components necessary for a homemade camera lens suitable for use on a SLR or DSLR: the optics (to focus the light) and the mechanics (to hold the optics in place and hopefully provide a method of adjusting the focus and aperture). The Optics Any lens that focuses light (a double convex, plano convex, or positive meniscus) can theoretically be used as a camera lens. Notice that I used the word theoretically above. So unless you already know the focal length of your lens, you should measure it. Starting Simple Let’s look at some examples, including different ways to address the mechanics. Adjustable Focus Results
Physics Simulation Game | Powder Game [POWDER] : Standard powder.[WATER] : Water splash.[FIRE] : Fire spark.[SEED] : Cast seeds to grow trees. [WIND] : Send wind toward the arrow direction. [BLOCK] : It blocks wind or dots. [UPLOAD] : Upload. * See below. - Uploading and Downloading - By selecting the [UPLOAD] button you'll save and uploadyour artwork on our server and you can share them. If you like the downloaded data, rate it.Voting helps to keep the quality of the work high. [Uploading has the following limitation]User registration is required.Upload only 1 time in 2 day.Only the author can upload his or her downloaded data.Up to 50 data can be uploaded within 12 hours. [Downloading has no limitation] [Voting has the following limitation]You can't vote for your own work.You can vote only 1 time for each work.You can't vote for works older than 3 months. It may contain offensive contents.The system blocks uploading when the text contains specific keywords.Do not write any advertisement on the work.
PC Architecture. A book by Michael B. Karbo - a book by Michael Karbo. This book is protected by copyright. It has been published in many European countries but never in English language. Therefore I desided to upload it to the Internet. It is free to use as it is for personal, non-commercial use. These web pages have been produced from a Microsoft Word file. PC Architecture.
c++ - How do I get started in embedded programming List of single-board computers One of the first 10 MMD-1s, a prototype unit, produced by E&L Instruments in 1976. The "dyna-micro"/"MMD-1" was the world's first true single board computer.[citation needed] The MMD-1 had all components on a single printed circuit board, including memory, I/O, user input device, and a display. Nothing external to the single board except power was required to both program and run the MMD-1. The original design of the MMD-1 was called the "dyna-micro", but it was soon re-branded as the "MMD-1" List of single-board computers – computers built on a single circuit board, with microprocessor(s), memory, input/output (I/O) and other features required of a functional computer. ARM based[edit] Other board[edit] ARM9, ARM11[edit] Cortex-M3[edit] Cortex-M4[edit] MYD-LPC435X EVM for NXP LPC4350/4357 ARM Cortex-M3 microcontrollers designed by MYIR Freescale i.MX[edit] OMAP[edit] Rabbit/Z80[edit] Rabbit SBC Signetics 2650[edit] ST-Ericsson NovaThor[edit] Snowball – ST-Ericsson Nova A9500 Xilinx Zynq[edit] P-Cubed
Arduino on a prototype board Arduino is a great prototyping platform and most of you probably know already about it. If not, check out the Arduino pages and the Arduino playground and dive into it. A couple of month ago I ordered my first Arduino board. It was one of the Diecimila revision. So what to do if these boards are far away across the ocean and it is holiday season everywhere? Gather components Luckily I had most needed components laying around. ATmega8, 16MHz, 8kB flash memory, 1kB sram memory2 x 0.1u capacitors2 x 22p capacitors16MHz crystal10k resistor1k resistorred 3mm LEDbutton6 pin header for ISP3 pin header for serial communicationprototyping boardUSBtoRS232 converterISP programmer All components can be bought for about 4.50€, without the ISP programmer and the USBtoRS232 converter. If I had a resonator, I would have taken that, instead of the crystal and the capacitors as it needs less space on the prototype board. The USB to RS232 converter is called USB-2-bot and comes from another project. Fuses