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- Elofsson, Rolf
(författare)
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The nauplius eye and frontal organs in decapoda (Crustacea)
- 1963
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Ingår i: Sarsia. - : Informa UK Limited. - 0036-4827. ; 12, s. 1-68
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Tidskriftsartikel (refereegranskat)abstract
- The present investigation concerns the nauplius eye and frontal organs in decapod Crustaceans. Representatives from all groups of the Decapoda are included. Some of the more important results are abstracted.The nauplius eye in several families within the Eucyphidea is more complicated than generally believed. It consists of a nauplius eye s. s. with three cups and three sensory cells in each and the incorporated dorsal frontal organ, which functions as an eye. The sensory cells are everse.The dorsal frontal organ is thus intimately connected with the nauplius eye s. s. and must not be mixed up with the eye papilla and the sensory pore X organ.The dorsal frontal organ is subjected to a considerable degree of variation. As part of a nauplius eye s, 1. as mentioned above it is an eye. In many species all over the Decapoda the frontal organ is reduced. A line of transformation can be shown from eye appearance through intermediate stages to “globuli” cells situated in the ganglion layer of the brain.The ventral frontal organ is more common than formerly believed and its paired nature is stressed.The author acceds to Hanström's hypothesis (1926) concerning the phytogeny of the frontal organs.
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- Åström, Karl Johan
(författare)
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Användning av siffermaskiner för syntes och realisering av regleringssystem : Föredrag vid NordSAM 63
- 1963
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Denna rapport ger en översikt av linjär optimal stokastisk kontroll. De fundamentala problemen formuleras och de centrala resultaten gives, utan bevis men med utförliga fysikaliska tolkningar. Användandet av siffermaskiner både för syntes och implementering behandlas. Vidare diskuteras några praktiska problem förenade med det optimala systemets realisering: val av samplingstid, reelltidsberäkning eller tabelluppslagning, adaptiv eliminering av tillfälliga mätfel.
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- Åström, Karl Johan
(författare)
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On the Choice of Sampling Rates in Optimal Linear Systems
- 1963
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- In a sample data system we are essentially restricted to control signals which are constant over the sampling interval. The purpose of this report is to analyze the effect of this restriction. The situation where the admissible control signals are piecewise continuous is used as a reference case and the problem is approached from a variational formulation of the control problem where the object of the control is to minimize a loss function.The minimal values of the loss function over the classes of piecewise constant and piecewise continuous control signals are compared. It is assumed that the system is linear and the criterion quadratic. Asymptotic formulas for small sampling intervals and Fortran programs for the evaluation of the values of the loss function in the discrete and continuous cases are given.
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