## What are the criteria for the selection of works t...

Asked by:

Can anyone explain what are the criteria for the selection of works to the Maple Application Center?
For example, my suggestion for placement in the Application Center is dedicated to the universal method of kinematic analysis of linkages.
http://www.mapleprimes.com/posts/204684-Lever-Mechanisms-
This is a very powerful numerical method that allows calculate the linkages with any number of degrees of freedom. Description and application examples were sent to the Application Center Maple February 14, 2017, and since then I cannot understand or know why this method does not appear there.
At the same time I was asked to put an example of rolling without slipping on Mobius strip.
http://www.mapleprimes.com/posts/207879-Rolling-Without-Slipping-On-A-Nonorientable
(And at this time the sample is already in Application Center.)
It seems to me that the Rolling can be attributed, rather, to toys and to fun and a little to the training in Maple. But the kinematic analysis of linkages is a very serious work, and has the potential to develop super CAD of linkages.
CAD of linkages with such capabilities as far as I know, does not exist yet.

Why is this so?

## Packing of circles: touchstone for global optimize...

Maple Maple Toolboxes

I would like to pay attention to a series of applications by Samir Khan
http://www.maplesoft.com/applications/view.aspx?SID=153600
http://www.maplesoft.com/applications/view.aspx?SID=153599
http://www.maplesoft.com/applications/view.aspx?SID=153596
http://www.maplesoft.com/applications/view.aspx?SID=153598
My congratulations to the author on his work well done. New capacities of Global Optimization Toolbox are spectacular. For example, in the first application  an optimization
problem in 101 variables under 5050 nonlinear  constraints
(other than 202 bounds) is solved.
I think it requires a very powerful comp and much time.
I tried that  problem for n=20 with the good old DirectSearch
on my comp (4 GB RAM, Pentium Dual-Core CPU E5700@3GHz) by

soln2 := DirectSearch:-GlobalSearch(rc, {cons1, cons2, rc >= 0,
seq(`and`(vars[i] >= -70, vars[i] <= 70), i = 1 .. 2*n), rc <= 70},
variables = vars, method = quadratic, number = 140, solutions = 1,
evaluationlimit = 20000)

and obtained not so bad rc=69.9609360106765 (whereas www.packomania.com gives rc=58.4005674790451137175957) in about one hour.

Packing_by_DS.mw
For n=50 the memory of my comp cannot allocate calculations or the obtained result by the Search command is far away from the one in packomania.

## Joining the team

Maple

I'm happy to announce that, having retired from University of British Columbia, I've joined Maplesoft as a Content Developer.  Some of my work will be appearing in the Application Center from time to time, and I'll announce them here.  If you have any suggestions for topics you'd like to see in the Application Center, I'd be interested in seeing them.

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