Gentse memoriedagen: 16-17-18-19 september

anti-2,2,3,3,6,6,7,7,10,10,11,11,14,14,15,15-Hexadeca­methyl-2,3,6,7,10,11,14,15-octa­silapenta­cyclo­[10.4.2.24,9.05,8.013,16]icosa-1(17),4,8,12(18),13(16),19-hexa­ene

The title compound, C28H52Si8, was synthesized by condensation of two mol-ecules of 1,2,3,4-tetra-kis-(chloro-dimethyl-sil-yl)benzene with lithium. The 3,4-disila-1,2-benzocyclo-butene rings in the centrosymmetric molecule are bridged by 1,1,2,2-tetra-methyl-disilanylene chains with an anti conformation. The benzene rings are deformed by fusion with a 3,4-disilacyclo-butene ring resulting in a ...

Autumn meeting, cambridge, 16 and 17 september 1977.

1 Week 04 : 16 and 18 September 2008

We now begin the definition and construction of Runge-Kutta methods. These one–step methods are essentially always stable, but designing Runge– Kutta methods which are consistent to high order can be difficult. This theory is presented in Sec. We have already seen several examples of Runge–Kutta methods: explicit and implicit Euler, the implicit midpoint rule, the explicit midpoint rule with Eu...

Packing 16, 17 or 18 circles in an equilateral triangle

We present new, efficient packings for 16, 17 and 18 congruent circles in an equilateral triangle. The results have been found by the use of simulated annealing and a quasi-Newton optimization technique, supplemented with some human intelligence.

بررسی رشد بدنی افراد 16، 17، 18، ساله

چکیده ندارد.