4,627 research outputs found
Finite groups have more conjugacy classes
We prove that for every there exists a so that
every group of order has at least conjugacy classes. This sharpens earlier results of
Pyber and Keller. Bertram speculates whether it is true that every finite group
of order has more than conjugacy classes. We answer Bertram's
question in the affirmative for groups with a trivial solvable radical
Properties of multilayer filters Interim report, 1 Sep. 1969 - 28 Feb. 1970
Using films of gold and silver for optical filter
Properties of multilayer filters Interim report, 1 Mar. - 31 Aug. 1969
Blocking filter effects on long-wavelength rejection of ultraviolet bandpass filte
Properties of multilayer filters Final report, 1 Mar. 1964 - 28 Feb. 1967
Optical interference bandpass filters for ultraviolet spectral regio
Properties of Multilayer Filters Interim Report, 1 Sep. 1965 - 28 Feb. 1966
Circuitry and calibration of solenoid actuated shutter for rapid firing of aluminum and design of ultraviolet band pass filte
Labour Market and Social Policy in Italy: Challenges and Changes. Bertelsmann Policy Brief #2016/02
vEight years after the outbreak of the financial crisis, Italy has still to cope with and
overcome a plethora of economic and social challenges. On top of this, it faces an
unfavourable demographic structure and severe disparities between its northern and
southern regions. Some promising reforms have recently been enacted, specifically
targeting poverty and social exclusion. However, much more remains to be done on
the way towards greater economic stability and widely shared prosperity
Grating-coupled excitation of multiple surface plasmon-polariton waves
The excitation of multiple surface-plasmon-polariton (SPP) waves of different
linear polarization states and phase speeds by a surface-relief grating formed
by a metal and a rugate filter, both of finite thickness, was studied
theoretically, using rigorous coupled-wave-analysis. The incident plane wave
can be either p or s polarized. The excitation of SPP waves is indicated by the
presence of those peaks in the plots of absorbance vs. the incidence angle that
are independent of the thickness of the rugate filter. The absorbance peaks
representing the excitation of s-polarized SPP waves are narrower than those
representing p-polarized SPP waves. Two incident plane waves propagating in
different directions may excite the same SPP wave. A line source could excite
several SPP waves simultaneously
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