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tech pearls and pearltrees (add yours)
robotics and phys. design
How Much Data Is That? Note: The information shown below uses measures associated specifically with data. For example, a kilo-anything is 1000 . . . Except that when it is a kilobyte, it is 1024, an even power of two. See my page on this topic here .
You might ask yourself... What's That Stuff? Ever wondered about what's really in hair coloring, Silly Putty, Cheese Wiz, artificial snow, or self-tanners? C&EN presents a collection of articles that gives you a look at the chemistry behind a wide variety of everyday products. Sort: Alphabetically (Text Only) | Most Recent
tech rewievs and news
The Medieval Technology Pages The Medieval Technology Pages are an attempt to provide accurate, referenced information on technological innovation and related subjects in western Europe during the Middle Ages. There are several ways to access this information. The most direct method is through the Subject Index which provides direct access to all the technology pages.
A fuel cell is an electrochemical device that combines hydrogen and oxygen to produce electricity, with water and heat as its by-product. In its simplest form, a single fuel cell consists of two electrodes – an anode and a cathode – with an electrolyte between them. At the anode, hydrogen reacts with a catalyst, creating a positively charged ion and a negatively charged electron. The proton then passes through the electrolyte, while the electron travels through a circuit, creating a current. At the cathode, oxygen reacts with the ion and electron, forming water and useful heat.
The proof, to me, was irrefutable. I had bought a new iPod within weeks of my coworker: the same generation player, running on the same lithium-ion (li-ion) cobalt oxide battery. She plugged it into her computer every day to get to her music.
These simulations were written in C++ as a senior year project by Fivos Asimakopoulos (email: fivasim at gmail.com) These versions are preliminary ones, without much attention to the relative gear diameters or vertical positions. However, the teeth count of the gears and the operation are accurate. Again, as for the animations, there are two versions of the simulation: one according to Price, and one according to the recent findings of the Antikythera Mechanism Research Project. The only inaccuracy of the new version is the fact that gears K1-K2 are fixed and they do not rotate along with gear E4. This will be fixed in the next version along with the correct inscriptions of the faceplates.
Why on Earth would you want to strap one of these to your wrist? It barely tells the time, and it can't take pictures, tweet or connect to your Facebook. In fact, very few people would have the faintest idea what it is, or why you'd want one at all. But for those that do recognize its intricate gears and dials, this tiny, complex piece of machinery tells a vivid and incredible tale.