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  • 1
    Electronic Resource
    Electronic Resource
    Thermo-indicating paint for damage warning (1996)
    Springer
    Journal of thermal analysis and calorimetry 46 (1996), S. 317-321 
    Details
    ISSN: 1572-8943
    Keywords: thermo-indicating paints
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Thermal analysis coupled with the measurement of temperatures at which colour changes are observed in situ was used to test various inorganic pigments with the aim of introducing them into the compositions of thermo-indicating paints. Through a reversible or irreversible modification of the colour these can indicate an undesired increase in temperature of a fluid in a metallic enclosure. Three such pigments are described, which indicate temperatures of 110, 300 and 400°C. The paint contains the thermo-indicator pigment, soluble glass as binder and either ultrafine silica or silica gel, or a mixture of Na2SiF6 and finely-ground sand as hardener. Such paints are used for damage warning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979971
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  • 2
    Electronic Resource
    Electronic Resource
    A histochemical method for L-amino acid tetrazolium reductase (1970)
    Springer
    Histochemistry and cell biology 21 (1970), S. 9-16 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Some incubation media were elaborated to demonstrate tissue activity of L-amino acid tetrazolium reductase. These media had as substrate a L-amino acid to which a small amount of L-glutamate was added, well below the concentration used to demonstrate glutamic-dehydrogenase. The specifity of the reactions was assessed by incubations in control media and by studying the effects of some inhibitors. The work was concerned both with the actual pattern of the reaction and with changes initiated in the medium by tissue incubation. It became obvious that in this way an actual visualisation of an enzymatic oxido-reductive activity of various degrees in tissues and organs was possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00304800
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  • 3
    Electronic Resource
    Electronic Resource
    Thermodiffusive characteristics of some adhesive, film-forming materials and the component solvents (1983)
    Springer
    Journal of thermal analysis and calorimetry 26 (1983), S. 65-72 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Aus den für verschiedene Temperaturen und Verdampfungsperioden erhaltenen TG-Kurven können die Thermodiffusiven Charakteristika von für adhäsive und filmbildende Materialien häufig verwendeten Lösungsmitteln ermittelt werden. Die Bestimmungen wurden in Luft bei einer Strömungsgeschwindigkeit von 51/h und im Temperaturbereich von 17–35° ausgeführt, wobei die Verdampfungsperiode bei jeder Temperatur 25 Minuten betrug. Untersucht wurden reine Lösungsmittel, Gemische mit Lösungsmittelverhältnissen, die denen in den Endprodukten entsprechen, sowie die Endprodukte selbst. Nach der vorgestellten Methode können die Verdampfungsgeschwindigkeiten solcher Lösungsmittel mit einer Standardabweichung von durchschnittlich 4% bestimmt werden.
    Abstract: Резюме ТГ-кривые, полученные при различных температурах и време ни испарения, позволи ли установить термодиф фузионные характери стики растворителей, часто используемых для связывающих и пле нкообразующих вещес тв. Определения были про ведены в атмосфере воздуха пр и объемной скорости п отока 5 л/час с чистыми растворите лями, с смесями растворител ей в пропорциях, соотв етствующих тем, что в конечных про дуктах, а также с конечными пр одуктами. Исследован ия проводились в темпер атурном интервале 17–35°. При каждой темпер атуре период испарен ия равнялся 25 минутам. Метод дает скорости испарения т аких растворителей с о средним стандартным отклоне нием в 4%.
    Notes: Abstract The TG curves obtained for various temperatures and evaporation times allowed establishment of the thermodiffusive characterics of the solvents frequently used in adhesive and film-forming materials. Determinations were carried out in air with a flow rate of 51/h, on pure solvents, on mixtures with solvent ratios corresponding to those in the final products, and on the final products. The temperature range of the study was 17–35°, the evaporation period for most cases at each temperature being 25 minutes. The method leads to the evaporation rates of such solvents with an average standard deviation of 4 per cent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01914089
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  • 4
    Electronic Resource
    Electronic Resource
    Study of thermal behaviour up to 1550° of materials containing calcium sulphate (1985)
    Springer
    Journal of thermal analysis and calorimetry 30 (1985), S. 297-303 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die thermische Analyse bis 1550 °C von CaSO4 enthaltenden natürlichen und synthetischen Materialien hat gezeigt, daß Temperaturbereiche zu unterscheiden sind, in denen die Dehydratisierung und die Zersetzung von Verunreinigungen und CaSO4 verlaufen. Die Zersetzung von CaSO4 setzt oberhalb 1200 °C ein und verläuft, abhängig vom CaO-Gehalt der Probe, in mehreren Schritten. Es wurde festgestellt, daß Calciumsulfat mit CaO mehrere eutektische Gemische (bei 1340, 1390, 1410 und 1450 °C) bildet. Jedem Zersetzungsschritt geht die Bildung und das Schmelzen eines eutektischen Gemischs voraus. Die Zersetzung selbst geht in der Schmelze vor sich.
    Abstract: Резюме Проведенный до темпе ратуры 1550 °С, термическ ий анализ, природных и си нтетических материалов, содержащ их сульфат кальция, по зволил определить температ урные интервалы процессов дегидратации, содерж ания примесей и разложени я сульфата кальция. Разложение п оследнего начитаетс я выше 1200 °С и протекает в нескольк о стадий, в зависимости от соде ржания окиси кальция в образце. Установлено, что суль фат кальция и окись кальция образу ют при температурах 1340, 1390, 1410 и 1450°С несколько эвтектиче ских смесей. Каждой стадии разложения предшест вует образование и плавле ние эвтектики, а само разложение про текает в расплаве.
    Notes: Abstract Thermal analysis up to 1550 °C on natural and synthetic materials containing CaSO4 revealed the temperature ranges of dehydration, impurity content decomposition and CaSO4 decomposition. CaSO4 decomposition starts above 1200 °C and proceeds in several steps, depending on the CaO content. CaSO4 forms several eutectic compositions with CaO (at 1340, 1390, 1410 and 1450 °C), each decomposition step being preceded by the formation and fusion of a eutectic composition, the decomposition taking place in the melt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02156495
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  • 5
    Electronic Resource
    Electronic Resource
    Contributions to the mechanism of water glass hardening by using thermal analysis methods and X-ray diffractometry (1991)
    Springer
    Journal of thermal analysis and calorimetry 37 (1991), S. 375-382 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die durch Thermoanalyse und Röntgendiffraktion gewonnenen Daten ermöglichten die Nutzung eines eutektischen Gemisches aus Na2O·2SiO2 und SiO2 mit einem Schmelzpunkt von 790°C. Auf dieser Basis wurde Wasserglas als Bindemittel zur Herstellung von künstlichen Cluster-Granulaten genutzt, die bei 800°C keramisch gehärtet wurden. Dieser Härtungsprozess von Wasserglas in Gegenwart von Härtemitteln wie z.B. Na2SiF6, NH4Cl, Silikagel und ultrafeiner Kieselerde wurde mittels Thermoanalyse untersucht. Im ersten Schritt der Gelbildung aus dem SiO2-Sol erfolgt die Neutralisation des NaOH-Deflokulanten, während der zweite Schritt durch Polykondensation eine dreidimensionale Vernetzung umfaßt, die durch SiO2-reiche Pulver unterstützt wird.
    Notes: Abstract Thermal analysis methods and X-ray diffractometry provided data on and permitted practical use of the eutectic mixture between Na2O·2SiO2 and SiO2, which melts at 790°C. Based on this, water glass was used as a binder to obtain artificial cluster granules, ceramically hardened by heating at 800°C. The process of water glass hardening in the presence of hardening reagents such as Na2SiF6, NH4Cl, silica gel and ultra-fine silica was studied by thermal analysis. In the first stage, gelification of the SiO2 sol takes place by neutralization of the NaOH deflocculant, while the second stage involves tridimensional cross-linking by polycondensation, promoted by powders rich in SiO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02055939
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis of Iron Oxides by Co2 Laser vs. Thermally Induced Decomposition of Inorganic Salts (1999)
    Springer
    Journal of thermal analysis and calorimetry 56 (1999), S. 183-189 
    Details
    ISSN: 1572-8943
    Keywords: IR laser ; iron oxide ; thermal analysis ; XRD
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract This paper reports on the synthesis of various iron oxides by the IR laser processing of different iron salts. X-ray diffraction techniques were used to characterize the reaction products. Some differences in terms of crystallite size and isotropy between these oxides and those obtained from the same salt by thermal means are described and explained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010180602236
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  • 7
    Electronic Resource
    Electronic Resource
    On the specificity of a histochemical method for localizing dihydrofolate dehydrogenase (1972)
    Springer
    Journal of molecular histology 4 (1972), S. 87-90 
    Details
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Synopsis The enzymic reduction of folate in the histochemical method described previously by the authors for localizing dihydrofolate dehydrogenase was followed spectrophotometrically by determining the decrease in the folate concentration in the medium during the incubation. In addition the different histochemical localizations of dihydrofolate dehydrogenase and NADH2 dehydrogenase were compared in smears of normal and leukaemic human blood.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01004967
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  • 8
    Electronic Resource
    Electronic Resource
    Influence of the preparation conditions on the diamagnetic response of high-T c YBa2Cu3O x superconductor (1988)
    Springer
    The European physical journal 70 (1988), S. 421-424 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Prolonged heat treatments in oxygen lead to a substantial increase of the diamagnetic signal of superconducting YBa2Cu3O x due to the decrease of the amount of defects and to the development of Josephson-like contacts between homogeneous superconducting regions in the sample. The superconducting-glass features are expected to be considerably reduced in well crystallized samples at least at liquid nitrogen temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01312114
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  • 9
    Electronic Resource
    Electronic Resource
    Structure and superconductivity of Bi-(Pb)-Ca-Sr-Cu-O ceramics processed by arc melting (1989)
    Springer
    Journal of superconductivity 2 (1989), S. 501-511 
    Details
    ISSN: 1572-9605
    Keywords: superconductors ; Bi-(Pb)-Ca-Sr-Cu-O ; X-ray diffraction ; electrical resistivity ; critical current density ; SEM ; a.c. susceptibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The Bi-(Pb)-Ca-Sr-Cu-O ceramics of typical cation composition 2 (0.4) 223, presintered at 800°C, are formed by arc melting and rapidly cooling the 2021 superconducting phase, CaO, and Cu2O. The arc-melted samples sintered in air at 840°C exhibit a solid-state structural transformation of the components and a mixture of 2122 and 2223 superconducting phases, and small amounts of Ca2CuO3, Ca2PbO4, and CuO appear. When the arc melting is used as an intermediate stage in the preparation of the high-T c superconductors in this system, a significant increase in density (from 3.7 to 5.7 g/cm3) and in critical current density (from 28 to 60 A/cm2 in zero field and at liquid-nitrogen temperature) is observed, while the critical temperature remains practically unchanged (−104 K).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00627563
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  • 10
    Electronic Resource
    Electronic Resource
    Sintering time and properties of YBa2Cu3O∼7 superconducting ceramics (1995)
    Springer
    Journal of superconductivity 8 (1995), S. 365-372 
    Details
    ISSN: 1572-9605
    Keywords: Superconductor ; Y-Ba-Cu-O ; X-ray diffraction ; SEM ; electric resistivity ; thermoelectric power ; dc magnetization ; critical current density
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The effect of annealing duration in oxygen flow on the superconducting characteristics of YBa2Cu3O∼7 bulk ceramics was investigated by structural, electrical, magnetic, and electronic microscopy investigations. The long-time annealing is deleterious for the superconductivity in YBa2Cu3O∼7 ceramics. The optimum time interval for annealing is from 20 to 70 h at 950°C, and within this range the maximum value ofT c is obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00728173
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