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- Andrej Krivda, L. E. Schmidt, +4 authors Henrik Hillborg
- IEEE Electrical Insulation Magazine
- 2008

The present IEC 60587 IEC standard needs several improvements which would help manufacturers of power equipment and material suppliers to assess outdoor polymeric materials in a more reliable way.

We consider the system âŽ§ âŽª âŽ¨ âŽª âŽ© âˆ’Î” p u = Î»f (v) in Î© âˆ’Î” q v = Î¼g(u) in Î© u = v = 0 on âˆ‚Î© (I) where Î” p u = div(|âˆ‡u| pâˆ’2 âˆ‡u), Î” q v = div(|âˆ‡v| qâˆ’2 âˆ‡v), p, q > 1, Î© is the open unit ball in R N , N â‰¥â€¦ (More)

We consider the system of differential equations âˆ’âˆ†p(x)u = Î»[g(x)a(u) + f(v)] in Î© âˆ’âˆ†q(x)v = Î»[g(x)b(v) + h(u)] in Î© u = v = 0 on âˆ‚Î© where p(x) âˆˆ C1(RN ) is a radial symmetric function such that supâ€¦ (More)

In this paper, we consider the system

We prove existence and nonexistence and uniqueness of positive solutions ï£²ï£³ âˆ’âˆ†pu = Î»f(v) + Î¸ in Î© âˆ’âˆ†qv = Î¼g(u) + Î² in Î© u = v = 0 on âˆ‚Î© where f, g : [0,âˆž) â†’ [0,âˆž), Î© is a bounded domain in R withâ€¦ (More)

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