Friday, March 07, 2008
The Lennard-Jones potential in its various forms is described in a Wikipedia article. The truncation of the potential at large distances by a simple chop and lift operation is described, but there is no mention of splines to avoid discontinuous first derivatives, or of any special treatment at small distances. The canonical form of the potential is 4ε*[(σ/r)12 - (σ/r)6]; an alternate form is D*[(R/r)12 - 2*(R/r)6)]. The first one uses the distance at which the potential is zero (σ), the second uses the distance at which the potential is minimal (R). ε and D are the well depth in both cases.
Monday, March 03, 2008
Tuesday, February 26, 2008
Wednesday, February 20, 2008
Is avoiding procrastination a different form of procrastination? Procrastination assigns higher priority to tasks that you want to do (but don't need to do) than to tasks that you need to do (but don't want to do), and acts accordingly. Is it possible to want to do things that you need to do? The want pulls more than the need pushes, and the want wins. I prefer walking downhill to running uphill.
Creating complex solutions to simple problems can provide the foundation for the production of more complex problems which may not have simple solutions. Productivity is proportional to the number of problems solved, inversely proportional to the effort to solve a problem, and inversely proportional to the number of problems created by the solution. This could be related to the measure twice, cut once concept.
Tuesday, February 12, 2008
What does it mean for an application user interface to be "responsive" while some task is being executed? It means that the application is still able to process input events, i.e. to react to user input. Depending on the task being executed, some input events may be ignored (for example, by disabling the part of the UI responsible for launching the task, until the task is complete and another one can be submitted). Some input events must not be ignored (for example, being able to close the application, or to interrupt the task).
Thursday, February 07, 2008
Wednesday, February 06, 2008
Friday, October 19, 2007
Wednesday, December 27, 2006
Friday, December 22, 2006
Creative-Reactive Balance
reflects the degree of balance between the creative dimensions and the reactive dimensions. The percentile score here gives you a sense of how you compare to other managers with respect to the amount of energy you put into reactive versus creative behavior. It also suggests the degree to which your leadership, relationships and goal oriented behavior is coming out of a creative or reactive orientation. It suggests the degree to which your self concept and inner motivation comes from within or are determined by external expectations, rules, or conditions.
Reference
Wednesday, December 20, 2006
Tuesday, December 19, 2006
Thursday, December 14, 2006
Wednesday, December 13, 2006
Tuesday, December 12, 2006
Thursday, December 07, 2006
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