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Walsh functions, Hadamard transforms

Fri, 2007-02-23 13:08 — Mark Dow

Flipping through a friends copy of Wolfram's "A New Kind of Science", I ran across an illustration of a 2-D basis set that exactly mirrored pencil drawings that Ted Bell made of all unique subsets of the 2-D Thue-Morse tiling. These drawings triggered an engineering geek response that they could be used to "decompose a sequence in terms of possible Thue-Morse subsequences (which forms a basis set for any sequence)".

Dense Image Space description

Sun, 2006-07-09 13:54 — Mark Dow

Dense Image Space (DIS) description

    This is a skeleton description of the construction and display geometry of a spatially dense array of images (dense image space, or DIS), which retains and utilizizes all overlapping image data. Superficially a DIS is similar to stitching multiple images into a panorama.

    With a panorama:

quotations

Thu, 2006-06-29 17:02 — PSR

Various quotes relating to the theme of enzymind.com: complexity, creativity, chaos, natures organizing principles.

Anyone feel free to add as long as you keep within the above bounds (or the spirit of them). Most recent at the top.

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2007-09-04 08:58:17

Quotations from creativity researcher Howard Gruber

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2007-09-01 19:05:17

Laptop Macgyvering

Mon, 2008-08-18 19:00 — PSR

Thanks for the email on the spam bots Mark. They're insidious. I turned off all anonymous posting. I will post more on general enzymind stuff later.

Web predictions

Thu, 2008-07-31 09:23 — PSR

 TED Video which speculates on the next 5000 days of the web. Infers connections between web and brain strucutre interconnectivity.

Also a nice fluid dynamics video of experiments being done on the interntational space station in micro gravity.

Diffraction limit

Sun, 2008-07-27 14:34 — PSR

Stumbled upon a video clip demonstrating 'structured illumunation' microscopy which gives a 2x increase in optical resolving power past the usual diffraction limited 200nm feature size dictated by 1/2 wavelength of the smallest visible light ~400nm. It uses compuational image processing of moire patterns created by illuminating the sample with 2 or more gratings at various offsets to each other.

Notes on photography 6/28/08

Sat, 2008-07-12 17:08 — Mark Dow

6/28/08 Bridge Thin photography

Doug Heiken and Mark Dow spent a half day taking video and stills of the Bridge Thin parcel (http://www.wikimapia.org/#lat=44.1654519&lon=-122.3126686&z=17&l=0&m=h&v=2). Warm sunny day.

10:10 Left Mark's house.

10:40 Diversion point for the Walterville Canal (http://www.wikimapia.org/#lat=44.0766565&lon=-122.7646637&z=17&l=0&m=h&v=2). (photo 18 mm, Canon SLR)

11:12 Blue River Resevoir turnoff (http://www.wikimapia.org/#lat=44.1650594&lon=-122.2898698&z=17&l=0&m=h&v=2).

2x2 symmetric L-systems

Fri, 2008-07-11 14:42 — Mark Dow

2x2 symmetric L-systems

"Symmetry is a complexity-reducing concept; seek it everywhere." Alan Perlis

   The simplest 2x2 replacement systems with rules that are globally and locally symmetric.
   
    Many other types of systems also have a large number of symmetries, for example:

Engineering and constructing meso-scale redundant materials

Sun, 2008-06-29 20:48 — Mark Dow

How do you rationally design and make materials that have highly organized micro-structure. Periodic and pseudo random structure occurs in many naturally formed materials, but not necessarily at the desired scale, or with a specific repeated unit or material. Non-periodic but deterministic structure is less common in non-living physical systems, but is the rule for living systems.

Growth and form are often locally rule based in living systems and globally rule based in non-living systems.

Bridge Thin photography

Sun, 2008-06-29 00:07 — Mark Dow

Doug Heiken and I took some video and still photos of forest land near the Blue River Resevoir, OR, that will be thinned, with the intention of re-photography after the thin. These are related notes and materials.

A 90 year old forest of mostly Douglas fir that was naturally established after fire about 90 years ago. This area will be thinned as part of the Bridge Thin timber sale, probably in late 2008 or 2009. The prescription is 17 foot "designation by description." Unit 82 and part of unit 80 are included in the polygon (see below).

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