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Sosiaalinen media kirjastoammattilaisen työssä. HowStuffWorks - Learn How Everything Works! Instructables - Make, How To, and DIY. Make: Projects How-to Projects Library — Electronics, Arduino, Crafts, Solar, Robots. EL Cycle If you're thinking, "'EL Cycle' sounds like a bicycle-powered EL wire project," then you are...

Make: Projects How-to Projects Library — Electronics, Arduino, Crafts, Solar, Robots

Cycle Chaser Project animations from the rear of your bicycle using a Raspberry Pi and open-source software.... Dark-Detecting LED Build a simple light-sensing circuit that switches an LED on when the lights go out. Wonder How To. How To Do Just About Everything! Science Toy Maker. Cavity magnetron. Magnetron with section removed to exhibit the cavities.

Cavity magnetron

The cathode in the center is not visible. The waveguide emitting microwaves is at the left. The magnet producing a field parallel to the long axis of the device is not shown. A similar magnetron with a different section removed. Central cathode is visible; antenna conducting microwaves at the top; magnet is not shown. Construction and operation[edit] A cross-sectional diagram of a resonant cavity magnetron. The sizes of the cavities determine the resonant frequency, and thereby the frequency of emitted microwaves.

The magnetron is a self-oscillating device requiring no external elements other than a power supply. Where there are an even number of cavities, two concentric rings can connect alternate cavity walls to prevent inefficient modes of oscillation. The magnetron is a fairly efficient device. Applications[edit] 3D Magnetic Field Viewer. Refrigeration. Commercial refrigeration Refrigeration is a process in which work is done to move heat from one location to another.


The work of heat transport is traditionally driven by mechanical work, but can also be driven by heat, magnetism, electricity, laser, or other means. Refrigeration has many applications, including, but not limited to: household refrigerators, industrial freezers, cryogenics, and air conditioning. Heat pumps may use the heat output of the refrigeration process, and also may be designed to be reversible, but are otherwise similar to refrigeration units. Refrigeration has had a large impact on industry, lifestyle, agriculture and settlement patterns. History[edit] Earliest Forms of Cooling[edit] The seasonal harvesting of snow and ice is an ancient practice estimated to have begun earlier than 1000 B.C.[1] A Chinese collection of lyrics from this time period known as the Shih king, describes religious ceremonies for filling and emptying ice cellars.

Ice harvesting[edit] Thing in a Jar. Thing in a Jar 7 inches by 4 inches, mason jar Pictured above is the Thing in a Jar that's usually sitting in my office at work.

Thing in a Jar

The coolest thing about the Thing is that everyone responds to seeing it by asking questions. Where did I find it? Plastic Milk experiment - Making polymers in the kitchen. Birkeland–Eyde process. The Birkeland–Eyde process was one of the competing industrial processes in the beginning of nitrogen based fertilizer production.

Birkeland–Eyde process

It was developed by Norwegian industrialist and scientist Kristian Birkeland along with his business partner Sam Eyde in 1903, based on a method used by Henry Cavendish in 1784.[1] This process was used to fix atmospheric nitrogen (N2) into nitric acid (HNO3), one of several chemical processes generally referred to as nitrogen fixation. The resultant nitric acid was then used as a source of nitrate (NO3-) in the reaction which may take place in the presence of water or another proton acceptor. A factory based on the process was built in Rjukan and Notodden in Norway, combined with the building of large hydroelectric power facilities.[2] Birkeland-Eyde reactor for making nitric acid.

Well thank you!

Birkeland-Eyde reactor for making nitric acid.

That takes some of the frustration of building 5 non-working reactors before this one away. But my design is NOT better than good. I'm going to do some improvements today: 1) Using larger pots to allow for continous running by eliminating the heat problem. This also allows for longer steel rods, exposing more air to the arc. Edit: I got a pair directly from IKEA, very nice (and EXPENSIVE) pots..... $7 each sigh. 2) Connecting 2 small lengths of PVC hose to the glass pipe at the bottom of the bubblers, each with 40 1.5mm holes drilled along their lengths to increase gas mix to water exposure.

Edit: Done, let's see the result. Glass Blowing. Soda-lime glass. Reusable soda-lime glass milk bottles Old window made from soda-lime flat glass, Jena, Germany.

Soda-lime glass

Interesting are the distorted reflections of a tree that give an indication that the flat glass was possibly not made by the float glass process. Soda-lime glass, also called soda-lime-silica glass, is the most prevalent type of glass, used for windowpanes, and glass containers (bottles and jars) for beverages, food, and some commodity items.

Hydrochloric Acid and Sodium Sulphate. Hydrochloric or muriatic acid is generally made by the action of sulphuric acid on common salt.

Hydrochloric Acid and Sodium Sulphate

How To Eco-Polish Your Copper Pots With Flour & Vinegar. Cleaning pennies with taco sauce. When I was in high school back in the 80s, I worked at Taco Bell.

Cleaning pennies with taco sauce

Work was not really tough at Taco Bell, so I had lots of time to goof off.