Conic Optimization-Markowitz portfolio optimization revisited

Hi,it is possible to transform min variance problem as conic optimization,I reviewed the MOSEK 11 Multi-period portfolio optimization — MOSEK Portfolio Optimization Cookbook 1.4.0
I want to do with AMPL but how,I am confused?help please.
It is possible to transform
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to
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and get conic form.First of all I want just minimization of s_t.