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A new method for measuring phase shift in heterodyne interferometric measurement (1990)

Bi, D. G. ; Kubo, S. ; Nishizawa, A. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 61 (1990), S. 1442-1447

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ISSN: 1089-7623

Source: AIP Digital Archive

Topics: Physics , Electrical Engineering, Measurement and Control Technology

Notes: A new method for analyzing the phase shift of probe beat in heterodyne interferometric measurement has been developed. The phase shift is obtained directly from the changes of the probe beat period without comparing with a reference beat. An electric circuit system has been designed according to this method of measurement, combined with a heterodyne interferometer of HCN laser or 4 mm microwave of line-integrated electron density of plasma in the compact helical system (CHS). The experimental results show that the method is effective. It simplifies the interferometric system and is free from the trouble of initial phase difference between the probe beat and reference. The minimum measurable phase shift is determined by the ratio of beat frequency to the counting clock frequency. The maximum measurable phase shift is infinite in principle.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1141149

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Chromosome numbers and C-banding in two wasp species of the genusPolistes (Hymenoptera Polistine, Polistini) (1990)

Pompolo, S. G. ; Takahashi, C. S.

Springer

Insectes sociaux 37 (1990), S. 251-257

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ISSN: 1420-9098

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Description / Table of Contents: Resume Une étude cytogénétique a été développée chez deux espèces de guêpes de la tribu Polistini comprenant la détermination du nombre de chromosomes et aussi la détection de l'hétérochromatine par l'emploi de la technique de la bande C.Polister (Epicnemius) cinerascens possède n=27, 2n=54, comprenant des chromosomes des types meta- subet acrocentriques; l'heterochromatine a une localisation diverisifiée: dans le centromére au long du chrosmosome.Polistes (Aphanilopterus) versicolor versicolor possède n=31, soit 2n=62 chromosomes des type meta-et submétacentriques; l'hétérochromatine et distribuée sur l'un des bras du chromosome.

Notes: Summary A cytogenetic study was performed on 2 waps species of the tribe polistini, including the determination of chromosome number and the detection of thterochromatin by C-banding technique.Polistes (Epicnemius) cinerascens presents n=27, 2n=54 chromosomes of the meta- sub- and acrocentric types; heterochromatin has a varied distribution: in and around the centromere in chromosomes: sometimes on one of the majority of the arms or on almost throughout the entire chromosomes.Poliste (Aphanilopterus) versicolor versicolor presents n=31, 2n=62 meta- and submetacentric chromosomes; heterochromatin is distributed on one of the chromosome arms.