Topics

A variety of maps, writings, and photos on a various topics that can’t easily be categorized into a county or place.

Show Only ...
Maps - Photos - Videos

Rubber Tires – A dirty business | DW Documentary

|

The booming global tire market is worth billions - but this comes at a high price, both to humans and the environment. Over 50 million car tires are sold each year in Germany alone. But where does the natural rubber for them come from?

Bulls – Triumph and Tragedy

|

This weekend we head down to move the bulls off of the cows and end the breeding season on the ranch. After a rain delay, we are struck with good luck and bad as life on the ranch continues the only way it knows how.

 

Nyquist-Shannon; The Backbone of Digital Sound

|

Most people don't understand how a digital recording is an exact reproduction of the analog waveform with no distortion.  Nyquist-Shannon says if you sample an audio signal digitally at twice the maximum bandwidth, as defined by the low-pass filter, mathematically the only signal that come out the other end, after going through another low-pass filter is the exact sine wave that went into the recorder. So, the digital sampling, actually can reproduce the exact analog sine wave -- all thanks to math. A Russian scientist invented Nyquist-Shannon in 1933 but it was rediscovered by Nyquist and Shannon in America circa 1964.

Chiller Types and Application Guide – Chiller basics, working principle hvac process engineering

|

In this video we look at chiller types and refrigerant compressor cooling technology within HVAC commercial refrigeration and provide an overview guide on when and where each chiller type is used. This covers air cooled chillers and water cooled chillers, centrifugal compressors, turbocor compressors, screw compressors, scroll compressors, reciprocating compressors, absorption chillers. We look at both vapor compression and vapor absorption chillers. How chillers work and the basic working principle of each.