Calm and the Opposite

It’s interesting. Once I’ve done a four hour hike to 10,800 feet, tasks like ‘Install Jenkins’ just take the amount of time they take. It’s interesting how much time they take, but the more interesting thing—I think—is that I’m not getting irritated by it. I can just communicate how long all of this takes, make notes—calmly—and move on with my life.

The Jenkins install doesn’t need to be the heroic effort in my life. I already did that, and got whatever chemicals (endorphins?) in the process. I kind of wish it didn’t require the levels of activity it does to bring me to a calm spot, but…. Using my job to get there isn’t working anymore, while the physical activity is, and I’ll take it. I’d rather be calm in my job and set expectations based on no more than I should reasonably be doing

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Cool Math Tricks: Deriving the Divergence, (Del or Nabla) into New (Cylindrical) Coordinate Systems

Now available as a Kindle ebook for 99 cents ! Get a spiffy ebook, and fund more physics The following is a pretty lengthy procedure, but converting the divergence, (nabla, del) operator between coordinate systems comes up pretty often. While there are tables for converting between common coordinate systems , there seem to be fewer explanations of the procedure for deriving the conversion, so here goes! What do we actually want? To convert the Cartesian nabla to the nabla for another coordinate system, say… cylindrical coordinates. What we’ll need: 1. The Cartesian Nabla: 2. A set of equations relating the Cartesian coordinates to cylindrical coordinates: 3. A set of equations relating the Cartesian basis vectors to the basis vectors of the new coordinate system: How to do it: Use the chain rule for differentiation to convert the derivatives with respect to the Cartesian variables to derivatives with respect to the cylindrical variables. The chain ...

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Copasetic Flow

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