Monthly Archives: December 2012

Lead Acid Battery Life Math

Posted on 24-December-2012 by mathscinotes

Quote of the Day The key to effective goal-setting is being realistic about what you can accomplish. — Andrea Woroch Introduction It is difficult to dig trenches for fiber optic cable in many parts of the US and Canada during … Continue reading →

Posted in Batteries, Electronics | 2 Comments

Battery Charge Capacity and Energy Math

Posted on 16-December-2012 by mathscinotes

Introduction I am doing some requirements analysis work on backup power systems for GPON ONTs. As part of this work, I need to perform an evaluation of a number of batteries for charge capacity and energy. As part of this … Continue reading →

Posted in Batteries, Electronics | 4 Comments

Outdoor Enclosure Temperature Profile Math

Posted on 9-December-2012 by mathscinotes

Introduction We build products that mount on the outside of homes -- homes that can be anywhere in the world. This means that the temperatures can be brutally cold (e.g. -46 °C in Bemidji, MN) or brutally hot (e.g. 49 … Continue reading →

Posted in General Science | 6 Comments

Torpedo Data Computer Video

Posted on 9-December-2012 by mathscinotes

I am a fan of both naval history and the history of computing machines. I just saw a great video on the Torpedo Data Computer (TDC) that have I include here. The TDC was one of the last examples of … Continue reading →

Posted in Electronics, History of Science and Technology | 1 Comment

Network Cable Math

Posted on 6-December-2012 by mathscinotes

Introduction Today I'm going to be discussing ethernet cables and if you've been reading this blog for a while, you know I'm no stranger to ethernet problems. I work with it quite a lot at work so I'm familiar with … Continue reading →

Posted in Electronics | 7 Comments