An optoelectronic recirculating sorter based on CMOS/vertical cavity surface emitting laser smart pixel arrays; architecture and system demonstration

The architecture of an optoelectronic recirculating sorter based on the hybrid integration of CMOS logic circuitry, silicon detector/receivers and vertical cavity surface emitting lasers is presented along with the demonstration of the system.     

Synthesis of aaptamine,a novel marine alkaloid

The novel sponge alkaloid aaptamine has been synthesized for the first time by an efficient route starting from 6-methoxy-7-hydroxy-3,4-dihydrolsoquinoline.     

Cosmological constraints on heavy weakly interacting fermions

The masses and lifetimes of very heavy weakly interacting fermions which appear in many grand unified gauge models are constrained by the requirement that their decays in the hot big bang early universe should not generate excessive entropy which would dilute n_B/n_γ below its observed value.     

Microchemical investigations of medicinal plants. XIII

Summary This paper describes the technique to isolate trace amounts of alkaloids from 500 mg of dry morning glory (Ipomoea violacea) leaves. Thin layer chromatography is employed and 7 alkaloids have been separated. The effect of solvent systems on separation is discussed.

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Zusammenfassung Isolierungsverfahren für Alkaloidspuren aus 500 mg getrockneten Blättern von Ipomoea violacea wurden beschrieben. Mit Hilfe der Dünnschichtchromatographie wurden 7 verschiedene Alkaloide getrennt. Der Einfluß der Lösungsmittelsysteme auf den Trennungsvorgang wurde erörtert.

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For Part XII see Mikrochim. Acta [Wien]1975 II, 455.     

Semi-regular plane polygons of integral type

A polygon is called semi-regular if its interior angles are equal to one another. The paper deals mainly with semi-regular polygons whose sides have integral lengths.     

Studies of the low-lying levels in192Pt and192Os

The energy level schemes of¹⁹²Os and¹⁹²Pt have been established on the basis ofγ- γ coincidence studies using a dual parameter data collection system. Ge(Li) detectors were employed to study the gamma spectra produced in the E.C. andβ ^? decays of¹⁹²Ir to¹⁹²Os and¹⁹²Pt, respectively. Thirteen new transitions and three new levels at 1,146.95, 1,237.35 and 1,913.76 keV are suggested. Relative intensities from singles measurements, branching ratios,α(K) and log ft values were calculated and multipolarities, spins and parities deduced. Comparisons are made with predictions of the Interacting Boson Model calculated on the basis of an O(6) to SU(3) transition.     

Book reviews

The Mathematical Intelligencer -