Saturday, June 28, 2014

Matlab solar system trajectory simulation

I wrote some code to simulate the trajectory of an object through a grossly simplified version of the solar system.  It uses the ordinary differential equation solver that comes with Matlab, some Newtonian physics, only has the Sun, Earth and Moon, and only uses idealized, circular orbits for those.  The code is here in this github repository:
https://github.com/dllahr/Matlab_solar_trajectory_sim

It's kind of fun to play with and someday I'd like to make an interactive web browser version of it, using perhaps this javascript library for numerical calculations:
http://numericjs.com/

Wednesday, May 21, 2014

Priceless description of thesis research

http://www.cs.virginia.edu/~evans/cs655/manifests/rabbit.html

This applies more generally, unfortunately

Tuesday, May 6, 2014

Peanut butter porter - the bottling

I bottled the peanut butter porter today, I used ~5/8 cup of dry malt extract for the sugar, boiled in water ~5 minutes, added to the beer as I was transferring from the carboy to the bottling bucket.  The material left over in the carboy was an oily mess, and based on that and what I tasted, I'm hopeful that most / all of the oil was left behind and the beer in the bottles is not oily.  However, I tasted it and it didn't really taste like peanut butter!

Monday, April 28, 2014

Video about BARD

My co-workers made a video about the BARD project, it is short but a great explanation of why BARD is needed and what it does.  Please consider checking it out and if you like, lick the thumbs up button:
https://www.youtube.com/watch?v=j9Z00y6g1iQ

Sunday, April 6, 2014

Carob Porter - the conclusion

Had a bottle of the Carob Porter on 2014-03-02 - at room temperature - tasted pretty good.  Bottom of bottle was covered in sediment, but the poor into the glass was not cloudy.  It is a very dark beer.

I continued to drink it on an almost daily basis and found it quite enjoyable.

Brewing a peanut butter porter - the wort

I began work the peanut butter porter today.  Ingredients:

12.75 oz. (includes plastic bag though) of grains (2/3 crystal malt, 1/6 black patent, 1/6 roasted barley)
3/4 oz. crystal hop pellets
1/2 cup brown sugar
1/2 cup blackstrap molasses
5 3/4 oz. corn sugar
2 1/4 oz. regular sugar
11 5/8 oz. CBW special dark malt extract (Briess)
1.5 lb. DME CBW special dark
1/2 lb. peanut butter, including oil on top, Teddie natural
1/8 oz. galena hops

I ground up the grain using the grain mill of our kitchenAid (coarsest setting, slowest speed), added it to 0.75 gallons of water in a 2.5 gallon pot, put it on high heat.

Sunday, March 23, 2014

Peanut butter in water - doubling the amount

A quick experiment today around boiling peanut butter in water.  I doubled the amount of peanut butter to 56 g in 1 cup of water.  During the boil it formed a complete emulsion, as far as I could tell there was no water, it was all very foam-like.  After the boil, I transferred to a mason jar with total volume slightly more than 4 cups.  It was initially uniformly cloudy white, but then settled into the 3 layers previously observed.  The bottom layer was bigger than previously observed.

I used a baster to extract the middle layer (water) and tasted it - tasted like peanut butter, but not more so than previously.

There doesn't appear to be any major benefit of using double the amount of peanut butter, and the downside is that the greater amount of bottom sediment might mean less usable / uncloudy beer.