Light, Antennas, and Holograms

Optical AntennaIn a previous post I talked about the use of nanoscale antennas for solar power collection. In this post I want to mention a few other ideas which relate to our new-found ability to manufacture extremely small-scale structures using processes in nanotechnology.

Technology is getting to the point where we can manufacture structures on various substrates that are only a few nanometers in size. Certainly it is now very easy to layer conducting elements on silicon which are smaller than a micron in length. In 2011 silicon technology reached the 22 nanometer length scale for CMOS processing. This corresponds to half the distance Continue reading

Flesh Love

Flesh LoveDesignBoom.com has some great posts about art and design. At the moment I particularly like Horst Kiechle’s torso with removable body organs completely made out of paper and looking like a computer graphics rendering. I am also a big fan of Tokyo photographer Hal’s Flesh Love series of photographs of vacuum sealed couples. It would be interesting to watch the artist in the process of taking these photos. Due to the fact that the couples are vacuum sealed in plastic, they have to hold their breath during the shoot, which obviously can only be for a Continue reading

The Power of Google

Nicolas Steno

On January 11th I was checking out some of the log files produced by wikipedia. I was trying to write a script to determine which articles are being read by people on an hourly basis to get results a little like this. I noticed that while Mitt Romney was way up in the page view hits on wikipedia at 8522 hits per hour, a less well known name was far more popular by more than an order of magnitude at 155257 hits Continue reading

Formal Indecision

Godel

A formal system in mathematics is a system which contains a set of axioms (unquestionable statements of truth), and then adds to these a set of production rules by which new true statements can be generated. The process of production can go on forever allowing a never-ending list of truths to be derived.

A famous result called Gödel’s incompleteness theorem shows that in such a system, there are some true statements that are nevertheless un-provable (undecidable) using the rules of the system. It shows that a self-consistent Continue reading

The Raven and the Shoe

Raven
The hypothesis that all ravens are black is logically equivalent to the statement that all non black things are non ravens, and this is supported by the observation of a white shoe.

This is a paraphrasing of a famous paradox due to Hempel. There is a lot of fairly impenetrable discussion on the Wikipedia page about this paradox, some of which I believe to be incorrect, and so I include a readable resolution based on a Bayesian perspective here, and I also relate this issue to our ability to know the truth Continue reading

Trees, Fractals and Solar Power

SunflowerThe Wall Street Journal recently ran a story about Aidan Dwyer, a 13 year old, who has created a stir with his science project which purported to show that if solar cells are arranged in space like leaves on a tree rather than on a flat surface, they collect more solar energy. His project write-up can be found here. The internet response has ranged from praise and offers of business capital to aggressive attacks and charges that his experiment is pseudoscience.

Unfortunately Aidan did not measure the right quantity (power) when performing his experiments, so in the original form they are not conclusive. What aspects of his ideas Continue reading

My Infinity is Bigger than Yours

Infinity

I have been reading a lot about numbers, Georg Cantor, and infinite set theory recently and thought I would share some of the more interesting things here. Mostly this concerns properties of the integers (whole numbers such as 0, 1, -1, 1032, …), the rationals (numbers that can be written as a/b, such as 1/2, 7/8, 22/7, …), and the irrational numbers, which are things like √2 or \pi which cannot be written as a/b. All these together make up the real numbers. Conventionally we write real numbers using decimal sequences so that 1.25 is a way of writing 5/4, but actually is a representation of the series 1 + 2/10 + 5/100. It is important to Continue reading