| 1. |
- Matveyenko, L.I., et al.
(författare)
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Studies of the 3c 345 Quasar Structure at Dm-Wavelengths
- 1987
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Ingår i: Observational evidence of activity in galaxies. - Dordrecht : D. Reidel Publishing Group. - 9027724733 - 9027724741 ; , s. 301-304
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Konferensbidrag (refereegranskat)abstract
- The structure of the quasar 3C 345 has been studied at 18 and 49 cm wavelengths by VLBI method. The structure has a nucleus and a jet, which changes direction with distance from the nucleus. The continuum emission of the nucleus and the jet regions correspond to a source with a large optical depth, the cut frequence goes down with increasing distance from nucleus.
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| 2. |
- Jones, D. L., et al.
(författare)
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High dynamic range VLBI observations of NGC 6251
- 1986
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Ingår i: Astrophysical Journal. - Philadelphia, United States : Institute of Physics Publishing, Inc. - 0004-637X .- 1538-4357. ; 305:2, s. 684-697
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Tidskriftsartikel (refereegranskat)
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| 3. |
- Tóth, I., et al.
(författare)
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Application of a sulphide-selective electrode in the absence of a pH-buffer
- 1988
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Ingår i: Talanta. - : Elsevier BV. - 0039-9140 .- 1873-3573. ; 35:10, s. 783-788
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Tidskriftsartikel (refereegranskat)abstract
- Calibration of a sulphide electrode in the pH-range 9-12 has been studied as an e.m.f. vs. (pH - p[HS-]) function by measuring e.m.f. and pH in parallel. Calibration can also be done in this pH range by using a differential amplifier with a three-electrode measuring cell (glass, sulphide-selective and reference electrodes). The effects of an antioxidant (ascorbic acid) and a complexing agent (DCTA) on the calibration of the glass-sulphide electrode cell at pH < 5 were studied. The applicability of this end-point indicator cell has been demonstrated for titrations of Ag+, Pb2+ and Bi3+ with Na2S.
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| 4. |
- Toth, I., et al.
(författare)
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STUDIES ON THE EXTRACTION OF GALLIUM AND ALUMINIUM WITH DIALKYL-DITHIOPHOSPHORIC ACIDS.
- 1986
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Ingår i: Reactive polymers. Ion exchangers, sorbents. - : Elsevier BV. - 0167-6989. ; 7:2-3
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Tidskriftsartikel (refereegranskat)abstract
- The extraction of Ga**3** plus has been studied with the liquid cation exchangers di-n-butyl-dithiophosphoric acid (DBTPA) and di-(2-ethylhexyl)-dithiophosphoric acid (DETPA) in kerosene. The partition of Ga**3** plus and Al**3** plus has been studied between equal volumes of aqueous and organic phases. The extraction coefficients obtained with DETPA are about one order of magnitude higher than those obtained with DBTPA. The trend of the extraction coefficients with increasing pH can be interpreted assuming the extraction of species M(DBTPA)//3 and M(DETPA)//3. The extraction coefficients are about two orders of magnitude higher for Ga**3** plus than for Al**3** plus . The extent of extraction of both Ga**3** plus and Al**3** plus decreases at higher pH and at pH less than 10 there is practically no extraction.
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| 5. |
- Tóth, Miklos, et al.
(författare)
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Identification of four components from the female sex pheromone of the lima‐bean pod borer, Etiella zinckenella
- 1989
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Ingår i: Entomologia Experimentalis et Applicata. - : Wiley. - 0013-8703. ; 51:2, s. 107-112
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Tidskriftsartikel (refereegranskat)abstract
- Four compounds, tetradecyl acetate, (Z)‐9‐tetradecenyl acetate, (E)‐11‐tetradecenyl acetate and (Z)‐11‐tetradecenyl acetate were identified from female sex pheromone extracts of Hungarian and Egyptian lima‐bean pod borers (Etiella zinckenella Tr., Lepidoptera: Phycitidae) by gas chromatography with flame ionization (FID) and electroantennographic (EAD) detection. In EAG studies these monounsaturated acetates gave the best responses in a series of other tetradecenyl acetates and tetradecenols. The four component blend of the identified components in similar ratios as in the pheromone extract attracted significant numbers of male lima‐bean pod borers in both Hungary and Egypt. In a preliminary subtraction test best capture was achieved by the ternary mixture of the monounsaturated acetates. Identification de quatre constituants de la phéromone des femelles d'Etiella zinckenella A partir de femelles d'E. zinckenella d'origines hongroise et égyptienne, nous avons isolé quatre composés par chromatographic en phase gazeuse avec ionisation de flamme et électroantennographie (EAD): l'acétate de tétradécanyl, l'acétate (Z)‐11‐tétradécényl, l'acétate (E)‐11‐tétradécényl et l'acétate (Z)‐11‐tétradécényl. Les acétates monoinsaturés donnent les meilleures réponses en EAG parmi une série d'acétates tétradécényls et de tétradécénols. Les quatre composés mélangés dans les mêmes proportions que dans l'extrait de la phéromone ont attiré un nombre significatif de mâles tant en Egypte qu'en Hongrie. Dans un test préliminaire de soustraction, la meilleure capture a été réalisée par le mélange ternaire d'acétates monoinsaturés. 1989 The Netherlands Entomological Society
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