Author Archives: mathscinotes

Ice Fishing Season is Now Over

Posted on 8-April-2014 by mathscinotes

Every night I walk around a lake by my house, which is still mainly frozen. The weather is warmer now, but you can still see some signs of the ice fishing that went on this winter. Yesterday afternoon, I chuckled … Continue reading →

Posted in Humor | Tagged | 2 Comments

Inductive Car Sensor Math

Posted on 7-April-2014 by mathscinotes

Introduction Spring has come to Minnesota and I want to build an outdoor electronics project -- this is one of my favorite activities. I have decided to build a car sensor for my cabin in northern Minnesota. This car sensor … Continue reading →

Posted in Cabin, Electronics | 2 Comments

Kepler Planet Finding Probabilities

Posted on 29-March-2014 by mathscinotes

One of my favorite online magazines is +Plus. I was reading an article in +Plus today about how the Kepler satellite finds exoplanets and the article mentioned a simple formula for the probability of Kepler being able to detect a planet. I thought it would be interesting to discuss this formula here because it involves a simple formula that provides insight into cutting-edge science. Continue reading →

Posted in Astronomy | 1 Comment

Discussion of Math Associated with MH370 Search

Posted on 26-March-2014 by mathscinotes

Here are a couple of web sources on how the course of MH370 was determined. CNN Ars Technica Some of these transponder-based, distance analyses reminds me a bit of the Oboe navigation system used during WW2. The Doppler shift work … Continue reading →

Posted in Navigation | Comments Off on Discussion of Math Associated with MH370 Search

6000 Meter Depth Rating on Ocean Search Gear

Posted on 23-March-2014 by mathscinotes

Quote of the Day The sea is notoriously unforgiving, but it reserves its harshest penalties for those who venture beneath its surface. — U.S. Navy veteran A.J. Hill I have been watching the news coverage of the search for the … Continue reading →

Posted in Underwater | 1 Comment

Frost Depth Deeper Than Normal This Winter

Posted on 16-March-2014 by mathscinotes

Quote of the Day Maybe not today..., maybe not tomorrow..., but someday... soon; ... and for the rest of your life ... - Rick Blaine, Casablanca. I was in my home town of Osseo this weekend to do some computer … Continue reading →

Posted in Construction | 1 Comment

Using a D-Size Battery String for a UPS Energy Source

Posted on 15-March-2014 by mathscinotes

Quote of the Day If there is one thing more than another for which I admire you, it is your original discovery of the Ten Commandments. — Thomas B. Reed to the youthful Theodore Roosevelt about his self-righteousness Introduction I … Continue reading →

Posted in Batteries, Electronics | Comments Off on Using a D-Size Battery String for a UPS Energy Source

A Simple Frequency-to-Voltage Converter

Posted on 13-March-2014 by mathscinotes

Quote of the Day We are what we repeatedly do. Excellence, then, is not an act, but a habit. - Aristotle Introduction I often build small electronics projects for use around my home. I recently put together a small sensor … Continue reading →

Posted in Electronics | 41 Comments

Population Occurrence Frequency Math

Posted on 8-March-2014 by mathscinotes

Quote of the Day Do what you can, with what you have, where you are. — Theodore Roosevelt I was reading an article on autism and the article mentioned that autism is much more prevalent in boys than girls. This … Continue reading →

Posted in General Science, Health | Comments Off on Population Occurrence Frequency Math

Paper Mechanism Project I Have to Build

Posted on 2-March-2014 by mathscinotes

I think this interrupted motion paper machine is really interesting. This is on my list for a project. If you want to see other projects like this, got Robert Ives' web site.

Posted in Paper Machines | Comments Off on Paper Mechanism Project I Have to Build