Welcome to Appropedia

From Appropedia
Jump to: navigation, search
edit  watch  

Sharing knowledge to build rich, sustainable lives.

Appropedia is for collaborative solutions
in sustainability, appropriate technology and poverty reduction.

You are welcome to add to and edit Appropedia -
your site to find, co-create and improve the solutions we need. Our vision and mission.

Contributors have made 284,554 edits and uploaded 22,423 files.
Browse our categories or all 6,244 articles.

edit  watch  

Announcements — more

Windmillprint-crop.jpg As part of a 3-D printing class, graduate students will be designing printable open-source appropriate technology for sustainable development. If you want a technology designed to be 3-D printed, post your ideas here. Chosen designs will be made and open-sourced for the global community. Deadline Nov. 13, 2014


Building a very hot parabolic solar cooker using pedal power tools.
Notice how the focus is the same for the various parabolas.
Aleiha's parabolic solar cooker. The paraboloid is an interesting shape with some amazing qualities. It has the power to concentrate light, electronic waves, sound, etc. to its focus at the center. To find the focal point of a paraboloid, one must use the formula, y=p*x^2, where p is a constant. The variable y is the depth of the dish, and x measures the distance from the center axis to the maximum circumference of the dish. You have to pretend that there is an x axis going through the center of the base of the dish and a perpendicular y-axis passing from the center of the base of the dish to the focal point. The two numbers, x and y, represent a point on the paraboloid, and from that, you are able to determine where the focus is.

Parabolic cookers have been used for centuries now. The idea to concentrate light using curved mirrors was developed by the Greeks, Aztecs, Incas, Romans and Chinese. The Incas used bronze and gold for their mirrors and they built structures that were several stories high. This technology seems to have appeared around the same time for each of the civilizations. It is thought that Archimedes harnessed the technologyW to defend Syracuse from invading Roman fleets in 212 BC.

Solar Charged Lawnmower

Converting a very used gas power lawnmower into a solar charged, low emission, almost silent, lawn cutting machine.

Bill Mollison talking about the future.
Permaculture is a design system for creating sustainable human environments. The word itself is a contraction not only of permanent and agriculture but also of permanent culture, as cultures cannot survive for long without a sustainable agricultural base and landuse ethic.

Bill MollisonW, Introduction to Permaculture
Aleiha's parabolic solar cooker
In physics, energy is an indirectly observed quantity. It is often understood as the ability a physical system has to do work on other physical systems. Since work is defined as a force acting through a distance (a length of space), energy is always equivalent to the ability to exert pulls or pushes against the basic forces of nature, along a path of a certain length.

Sustainable energy is the provision of energy that meets the needs of the present without compromising the ability of future generations to meet their needs. Sustainable energy sources are most often regarded as including all renewable energy sources, such as hydroelectricity, solar energy and power, wind power, wave power, geothermal energy and power, biomass fuel and energy, and tidal power. It usually also includes technologies that improve energy efficiency.

While many renewable energy projects are large-scale, renewable technologies are also suited to rural and remote areas, where energy is often crucial in human development. As of 2011, small solar photovoltaic (PV) systems provide electricity to a few million households, and micro-hydro configured into mini-grids serves many more. Over 44 million households use biogas made in household-scale digesters for lighting and/or cooking, and more than 166 million households rely on a new generation of more-efficient biomass cookstoves.

edit  watch  Selected service learning Projects gallery (refresh)

Engr305 Appropriate Technology Projects: Below are selected service learning projects from Engr305 Appropriate Technology, which is a course on appropriate technology at Humboldt State University taught by instructor Lonny Grafman.

Air Ship Air City rooftop greywater filtration

A rooftop greywater filtration system  
Aleiha's parabolic solar cooker

Parabolic Solar Cooker  
Amal's ethanol still

A valved reflux ethanol still  
Backyard Biodigester

A biodigester converting organic waste to a fuel source  
Bike Rodeo bicycle blender

A kid's bike blender for Rio Dell Community Resource Center  
Bike trailer

A bike trailer from a converted baby stroller  
Blue ox earthen oven

Blue Ox earthen oven  
Bottoms strawbale earthen plaster

Earthen plaster and natural paint recipes  

edit  watch  

Selected categories

edit  watch  

Construction zone — correct mistakes & flag spam as needed

Newest articles more Wanted pages - click to add info more
Under construction
New pages being developed:
  1. San Francisco
  2. Solar Roadways
  3. San Diego
  4. Patsari Cookstove Construction Manual (in Spanish)
  5. Long Beach
  6. InGaN growth buffer layer literature review
  7. Recources
  8. Excubator
  9. Design of Multi-Junction Photovoltaic Cells Optimized for Varied Atmospheric Conditions
  10. Earth Reforestation Project

Note: Appropedia's newest pages may not yet comply with our policies. Page titles in italics are "redirects," often created when moving a page.

Under construction

Create a new page:

  1. Animals
  2. Organic waste
  3. Nutrition
  4. Ecosystem
  5. Human development
  6. Clay
  7. Environmental science
  8. Appropriate energy overview
  9. Building management systems
  10. Open sustainability

These red links are invitations for you to contribute your knowledge.

Or create a page on the topic of your choice.

Newest files - images and documents that can be added to pages more

Note: Appropedia's newest files may not yet comply with our policies.

edit  watch  

Please help Appropedia grow!

We want your projects, current works, observations and wisdom! See Contributing content. Improve articles by clicking "edit" at top of the page or section. Our philosophy is: Be Bold and contribute!

Questions? Comments? Visit the Village Pump. Also discuss Appropedia and related topics over on the Permies permaculture forums.

Find us on Facebook, Twitter, Identica,FriendFeed, StumbleUpon and Delicious. Check our Flickr images and YouTube videos.