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  • 2000-2004  (9)
  • 1965-1969  (30)
  • 1945-1949  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    The Frankfurt 200 mA proton source : The 8th international conference on ion sources (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 836-838 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: For the International Fusion Materials Irradiation Facility (IFMIF) scenario, a 140 mA deuterium beam in continuous wave (cw) mode with an atomic yield of above 85% is required. The normalized root-mean-square emittance should be less than 0.2 π mm mrad at the entrance of a RFQ. As part of a conceptual design for IFMIF, a new ion source has been developed and is tested at the Institut für Angewandte Physik in Frankfurt. The ion source is of the volume type with a tungsten cathode driving the discharge. Both cw and pulsed mode are possible and were studied. First experiments were carried out with deuterium. 80 mA deuterons with a D+ fraction of above 90% were extracted [A. Maser et al., Rev. Sci. Instrum. 67, 1054 (1996)]. In order to avoid neutron generation by the d–d reaction, hydrogen was used instead of deuterium later on. As far as the ion source and plasma production processes are concerned, the use of hydrogen instead of deuterium is equivalent because of their similar atomic shells. Recently, a 200 mA proton beam at 55 kV was extracted in cw mode (according to Child–Langmuir, 200 mA H+ corresponds to 140 mA D+) with a H+ fraction of 93%. This article will give a detailed description of the ion source and the essential experimental results. Especially, the influence of important physical parameters (such as discharge current and strength of the filter field) on the H+ fraction was studied. By using different kinds of auxiliary gases, the influence on the H+ fraction and the noise level were investigated, too. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150307
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  • 2
    Electronic Resource
    Electronic Resource
    Equilibration of p-menthadienes in acid and base (1969)
    s.l. : American Chemical Society
    The @journal of organic chemistry 34 (1969), S. 2615-2617 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo01261a027
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  • 3
    Electronic Resource
    Electronic Resource
    Measurement of the beam emittance of the Frankfurt proton source : Papers from the Ninth International Conference on Ion Sources (2002)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 73 (2002), S. 1027-1029 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: For the International Fusion Materials Irradiation Facility project (IFMIF) the Institut für Angewandte Physik at the University of Frankfurt is concerned with developing a high current proton/deuteron ion source. The 1999 "Frankfurt 200 mA Proton Source" is a volume type belonging to the high-efficient ion-sources family. This type of ion source has proven its capability to produce high-current ion beams of a single mass-to-charge ratio at very low-beam emittances. The arc discharge ion source delivers a 200 mA full beam (93% protons) at 55 keV with very high-beam intensities (outlet aperture 8 mm diam). Thus, the beam requirements for the IFMIF project are fulfilled. After having done the basic plasma investigation with a 127° cylinder spectrometer, the quality of the ion beam was a point of interest. Therefore, the beam emittance was measured with a conventional slit-grid measurement device. The goal was to measure the beam emittance at high-beam currents. The article will give a detailed description of the measurement of a 56 mA beam at 26 keV with 85% protons. Theoretical considerations of the emittance value, given by ion temperature and aberrations of the extraction system, allows an estimation of the emittance of a 170 mA at 55 keV proton beam. In a second step, an estimation of a postaccelerated 140 mA at 100 keV deuteron beam was completed. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1431418
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  • 4
    Electronic Resource
    Electronic Resource
    Spectrochemical analysis of semiconductor grade boron tribromide with a plasma jet (1968)
    s.l. : American Chemical Society
    Analytical chemistry 40 (1968), S. 2041-2042 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60269a040
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  • 5
    facet.materialart.
    Unknown
    Formale und materiale Prinzipien in Kants Ethik (1969)
    Berlin : Periodicals Archive Online (PAO)
    Kant-Studien. 60:2 (1969) 183 
    Details
    ISSN: 0022-8877
    Topics: Philosophy
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:0171-1969-060-02-000007
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  • 6
    Electronic Resource
    Electronic Resource
    Experimental determination of the instrumental transparency function of texture goniometers (2000)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 33 (2000), S. 1162-1174 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The instrumental transparency functions of five commercially available texture goniometers were measured experimentally with six monocrystalline samples cut in different orientations from a large highly perfect silicon crystal with a rocking curve of less than 0.01°. Transparency functions were measured in steps of 0.02 to 0.2° in the pole-figure angles α, β. The window size Δα depends on the Bragg angle θ in the form 1/sinθ; the window size Δω is constant for each goniometer. The dominant instrumental parameter determining the long axis Δα of the pole-figure window is the axial width of the detector entrance slit. This parameter is smallest for area detectors (smaller by more than an order of magnitude compared with conventional scintillation detectors as well as one-dimensional position-sensitive detectors). The main features of the pole-figure window and their dependence on the instrumental parameters can be deduced fairly well from a simple geometrical model. The particular shapes of the transparency functions of the studied goniometers are markedly different. Particularly, they are not very well represented by Gauss functions. The two-dimensional transparency function can be fairly well characterized by its α and β profiles. The normalized profiles are virtually independent of the goniometer angles 2θ and α. The increasing size of the pole-figure window with decreasing θ puts a lower limit on the Bragg angle below which pole-figure measurement ceases to be meaningful.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889800007251
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  • 7
    Electronic Resource
    Electronic Resource
    Zur Standardisierung der Dünnschichtchromatographie (1967)
    Springer
    International journal of legal medicine 60 (1967), S. 1-5 
    Details
    ISSN: 1437-1596
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Description / Table of Contents: Summary A simplified method for thin-layer chromatography (T.L.C.) in glass tubes is described, showing the following advantages: 1. Due to the accurate adjustment of the water content of the layer, the Rf values are better reproducible than with the conventional techniques. 2. Activated at the desired temperatures the ready-coated tubes (inactive tubes) allow the selection of the most favorable separating conditions. 3. Owing to the standardized conditions it is possible to directly compare the results of different tets. Both the coated, activated, and air-dry tubes and the necessary accessories are available from C. Desaga, Heidelberg, Germany.
    Notes: Zusammenfassung Es wird eine einfache Methode der Dünnschichtchromatographie in Glasröhren (Tubes) mit folgenden Vorteilen beschrieben: 1. Durch die exakte Einstellbarkeit des Wassergehaltes der Schicht sind die Rf-Werte besser als mit den bisher üblichen Methoden reproduzierbar. 2. Die vorgefertigten beschichteten Röhrchen (inaktive Tubes) ermöglichen, bei verschiedenen Temperaturen aktiviert, die Auswahl jeweils günstigster Trennungsbedingungen. 3. Die standardisierten Bedingungen erlauben den unmittelbaren Vergleich der Ergebnisse verschiedener Untersuchungen. Die beschichteten, aktivierten und lufttrockenen tubes sowie das nötige Zubehör können jetzt von C. Desaga (Heidelberg) bezogen werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00580230
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  • 8
    Electronic Resource
    Electronic Resource
    Untersuchungen über den Tagesgang der Koordination von Herzrhythmus und arterieller Grundschwingung (1969)
    Springer
    Basic research in cardiology 59 (1969), S. 235-259 
    Details
    ISSN: 1435-1803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02119808
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Feinstruktur der Speichelgangcarcinome (1969)
    Springer
    Virchows Archiv 346 (1969), S. 1-14 
    Details
    ISSN: 1432-2307
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die feinstrukturelle Untersuchung von 2 Speichelgangcarcinomen der Gl. parotis des Menschen zeigt, daß in diesen Geschwülsten Zellen vorkommen, deren feinstrukturelle Organisation derjenigen der Myoepithelien der Speicheldrüsen und anderer Organe völlig gleicht. Die übrigen Geschwulstzellen weisen trotz abweichender Form und Lage viele ultrastrukturelle Gemeinsamkeiten mit den Myoepithelzellen auf, während andererseits auch Zeichen einer gewissen sekretorischen Tätigkeit erkennbar sind. Wegen dieser cytologischen Eigenart können die Speichelgangcarcinome vom pluripotenten Epithel der Speicheldrüsengänge abgeleitet werden. Der durch das Vorkommen der Myoepithelien bedingte organoide Aufbau der Geschwülste erlaubt eine Abgrenzung von anderen Speicheldrüsentumoren. Die auffallende Ähnlichkeit der Speichelgangcarcinome mit den Milchgangcarcinomen der menschlichen Brustdrüse ist auch im Bereich der Feinstruktur nachweisbar. — Die feinstrukturelle Untersuchung der Speichelgangcarcinome hat somit weitere wichtige Belege dafür beigebracht, daß diese Geschwülste eine besondere Gruppe von Speicheldrüsentumoren darstellen.
    Notes: Summary Fine structural investigation of two human salivary duct carcinomas revealed typical myoepithelial cells which resembled the myoepithelium of salivary glands. The epithelial cells of the salivary-duct carcinomas also showed some similarities to the myoepithelial cells. It is assumed that the salivary duct carcinomas, which have a fine structural organization strikingly like that of the duct carcinomas of the human mammary gland, originate from the pluripotential epithelium of the salivary ducts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00548462
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  • 10
    Electronic Resource
    Electronic Resource
    Speichelgangcarcinome (1968)
    Springer
    European archives of oto-rhino-laryngology and head & neck 192 (1968), S. 100-115 
    Details
    ISSN: 1434-4726
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In Analogie zu den Milchgangcarcinomen der Mamma wird eine Gruppe von Speicheldrusentumoren beschrieben, die im morphologischen Aufbau und im Wachstumsverhalten mit den Milchgangcarcinomen weitgehend über einstimmen. Auch bei den Speichelgangcarcinomen kann man sogenannte Comedo-carcinome, intraduktale Papillome und papilläre Carcinome Bowie Geschwülste, die einer fibrosierenden Adenose der Brustdrüse gleichen, morphologisch unterscheiden. Gemeinsam ist diesen Tumoren die Zusammensetzung aus wuchernden, oft schleimbildenden Gangepithelien und aus Myoepithelien, die aber nur die organoiden Strukturen vervollständigen. Speichelgangcarcinome sind selten (etwa 1% unserer Sammlung von Speicheldrusentumoren), sie treten vor allem bei älteren Personen auf. Es gibt rasch wachsende, lymphogen und hämatogen metastasierende Speichelgangcarcinome neben sehr langsam wachsenden, relativ „gutartig” verlaufenden Tumoren.
    Notes: Summary A special group of tumors in the parotid gland is described which shows striking similarities with the duct carcinomas of the mammary gland. In these duct carcinomas of the salivary gland we found the same variations (comedo-carcinomas, intraductal papillomas, papillary carcinomas and fibrotic adenosis) as in the above mentioned mammary tumors. The intraductal carcinomas consist of proliferating occasionally mucous producing epithelial cells and of myoepithelial basket cells. The latter however are only of minor importance and are found in the typical basal position of the epithelial formations. Intraductal salivary carcinomas account for about 1 % of salivary gland tumors and occur predominantly in elderly people. In some cases these tumors involve rapid growth, with hematogeneous and lymphogeneous metastasis, while others grow very slowly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00301495
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