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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic detection for underground pipes (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 6029-6029 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic detection has been investigated for use in detecting the location of underground pipelines, such as gas and water lines, by inputting a signal current into a pipeline and detecting magnetic field ((approximately-less-than)100 μG) generated by that current. Measurement factors necessary for accurate detection have been experimentally determined and are discussed. From measurements made on signal current distribution (the current flowing in pipes and leaking from them to ground), it has been concluded that detection error is caused by the leakage current, namely, the current to ground. The detection error is due to the noncenter symmetric distribution of the ground current flowing around a pipe. Even though the ground current is inevitable when flowing a signal current into pipes, it is possible to reduce the error by reducing the nonsymmetry by lowering the signal frequency below 10 kHz in this work. The ground current distribution was obtained by measuring the potential difference between two electrodes, both of which were rod shaped and inserted in the ground to the same depth. At low frequencies below 10 kHz, the ground current distribution in a cross section perpendicular to the pipe showed a rather center symmetry around the pipe, while at high frequencies the distribution changed to a noncenter symmetry with a significant current increase in a region near the ground surface. The drastic change in the distribution of the ground current was also confirmed by magnetic field distribution measurements conducted on the ground using three orthogonally arranged magnetic sensors, each with a sensitivity of 1 μG.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342140
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  • 2
    Electronic Resource
    Electronic Resource
    Pipe locator for imaging underground pipelines (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 6030-6030 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recently, it becomes more important to locate the complex piping patterns such as tee, bend, riser, and the others with high accuracy for maintenance and protection of city gas pipelines. Hence, we have developed a new pipe locator system for imaging the complex underground pipelines using magnetic remote sensing techniques. The main framework of this development is the application of the pattern recognition of the magnetic field distribution to the location of buried pipelines in urban areas. The first step for imaging the complex pipelines is to measure the three-dimensional magnetic field distribution with high accuracy which is generated by the passage of the alternating signal current through buried pipeline. For this purpose a portable trolley unit which is capable of scanning the ground to collect data, the 10 three-axes coil sensors with a sensitivity of 1 μG which are aligned in the unit, and a filter system using a FFT signal processor which eliminates urban magnetic noise as high as 10 mG in some cases, were developed. The second step is to process the magnetic field distribution data, to extract the feature of the underground pipeline using the contour diagram and the three-dimensional drawing of the magnetic field, and to identify the complex piping patterns. Further, we recognized that a nonlinear least-square method algorithm for calculation of the pipeline's position was useful to improve the location accuracy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342141
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  • 3
    Electronic Resource
    Electronic Resource
    Distribution of the number of electrons in electron avalanches at voltages in excess of the sparking value (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 995-996 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: For times greater than the electron transit time, a suitable statistical theory of the total number of electrons in avalanches is presented, and compared with the results simulated by the Monte Carlo method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334538
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  • 4
    Electronic Resource
    Electronic Resource
    Astrophysical Contributions of the International Ultraviolet Explorer (1989)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 27 (1989), S. 397-420 
    Details
    ISSN: 0066-4146
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.aa.27.090189.002145
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  • 5
    Electronic Resource
    Electronic Resource
    IUE observations of X-ray sources: HD153919 (4U1700–37), HDE226868 (Cyg X-1), HZ Her (Her X-1) (1978)
    [s.l.] : Nature Publishing Group
    Nature 275 (1978), S. 400-403 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] BINARY X-ray sources containing a compact object represent a class of stars that generally have been inaccessible to UV spectroscopic observations due to their faintness. Studies of these objects can potentially discern the physical conditions and dynamics of the material in the sources themselves ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/275400a0
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  • 6
    Electronic Resource
    Electronic Resource
    Specific inhibition of formation of acid-fastness in mycobacteria by 3,3′-di-O-methylellagic acid (1979)
    Springer
    Cellular and molecular life sciences 35 (1979), S. 599-600 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 3,3′-Di-O-methylellagic acid obtained fromEuphorbia adenochlora selectively inhibited the formation of acidfastness in mycobacteria without retardation of their growth. Gross reductions in contents of wax D, cord factor and free mycolic acids were found in the nonacid-fast bacilli compared with the normal ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01960343
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  • 7
    Electronic Resource
    Electronic Resource
    Stratospheric clouds and ozone depletion in the Arctic during January 1989 (1989)
    [s.l.] : Nature Publishing Group
    Nature 340 (1989), S. 117-121 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Stratospheric clouds, believed to be necessary for springtime polar ozone depletion to take place, were detected with balloon-borne sensors at Kiruna, Sweden during January 1989, the coldest January in the north polar stratosphere for at least 25 years. Comparison of the ozone profile in the region ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/340117a0
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  • 8
    Electronic Resource
    Electronic Resource
    Immunofluorescent and biochemical studies on tyrosine hydroxylase and dopamine-β-hydroxylase of the bullfrog sciatic nerves (1979)
    Springer
    Histochemistry and cell biology 61 (1979), S. 103-109 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Immunofluorescence specific for tyrosine hydroxylase (TH) or dopamine-β-hydroxylase (DBH) was accentuated in both proximal and distal segments of the sciatic nerve after ligation. Estimations of the enzyme activities confirmed the above results. Mean axoplasmic flow rates of TH and DBH in bullfrog sciatic nerve were found to be 8 and 123 mm/day, respectively. They were decreased by colchicine or by cold temperatures (4° C).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00496522
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  • 9
    Electronic Resource
    Electronic Resource
    Immunocytochemical localization of tyrosine hydroxylase, dopamine-β-hydroxylase and phenylethanolamine-N-methyltransferase in the adrenal glands of the frog and rat by a peroxidase-antiperoxidase method (1979)
    Springer
    Histochemistry and cell biology 64 (1979), S. 131-144 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The subcellular locilazations of tryrosine hydroxylase (TH), dopamine-β-hydroxylase (DBH) and phenylethanolamine-N-methyltransferase (PNMT) in the adrenal glands of the frog and rat have been examined by a peroxidase-antiperoxidase (PAP) method. TH was localized in the ground substance of the adrenaline-containing cells and noradrenaline-containing cells, but not in the nucleus or in the mitochondria. TH was also located on the outside of the membrane of the chromaffin granules. DBH was observed only inside the granules. PNMT was found not only in the ground substance but also on the membrane of some adrenaline-containing granules. Cortical lipid cells of the frog adrenals did not show TH-, DBH-, and PNMT-reactions. The negative reactions to TH-, DBH-, and PNMT-antiserum exhibited by the summer cells of the frog adrenals prove that they belong to the cortical cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00490094
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  • 10
    Electronic Resource
    Electronic Resource
    Oxidation kinetics of iron sulfide in the form of dense plate, pellet and single particle (1989)
    Springer
    Journal of thermal analysis and calorimetry 35 (1989), S. 1751-1759 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird das Oxydationsverhalten von dichten Plättchen, Pelletts und einzelnen Partikeln aus Magnetkies verglichen. Bei der Oxydation von dichten FeS-Plättchen geschieht in erster Linie eine Oxydation von Eisen unter Bildung einer dichten Oxidschicht während des frühen Stadiums der Oxydation, anschließend daran erfolgt die Oxydation begleitet durch die Entstehung von SO2-Gas, insofern die Zusammensetzung von Magnetkies Fe0.9S erreicht. Da Pellets aus feinen Partikeln bestehen, laufen bei der Oxydation von FeS-Pellets beide obengenannten Oxydationsvorgänge gleichzeitig ab. Bei der Oxydation von einzelnen Partikeln geringer Größe entzünden sich diese wegen der Oxydationswärme, die Partikel schmelzen in einer Zeit von weniger als 1 Sekunde.
    Abstract: Резюме Сопоставлен процесс окисления пирротита в форме плотных пласти нок, таблеток и его отдельных частиц. При окислении плотны х пластинок FeS на ранней стадии окис ления имеет место предпочтитель ное окисление железа с образованием плотно го оксидного слоя, а последующее окислен ие сопровождается вы делением двуокиси серы, после ч его состав пирротита становитс я Fe0.9S. При окислении таб леток FeS обе вышеуказанные ре акции протекают одновреме нно, поскольку таблет ки состоят из очень мелких части ц. При окислении отдельных частиц мал ого размера происход ит их воспламенение, что об условлено теплотой окисления, вследстви и чего частицы плавят ся в течении времени меньше одной секунды.
    Notes: Abstract The oxidation behaviours of pyrrhotite in the form of dense plate, pellet and single particle were compared. In the oxidation of dense plate of FeS, preferential oxidation of iron took place to form a dense oxide layer in the earlier stage of oxidation, and the subsequent oxidation accompanying the evolution of SO2 gas proceeded after the composition of pyrrhotite attained Fe0.9S. In the oxidation of FeS pellet, both the above reactions take place simultaneously because the pellet consists of fine particles. In the oxidation of single particle of small size, ignition of the particle occurred due to the heat of oxidation, and the particle melted in a very short time less than 1 second.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01911664
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