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  • 1
    Electronic Resource
    Electronic Resource
    Lasing in the vertical direction in InGaN/GaN/AlGaN structures with InGaN quantum dots (2000)
    Springer
    Semiconductors 34 (2000), S. 481-487 
    Details
    ISSN: 1063-7826
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract InGaN/GaN structures with dense arrays of InGaN nanodomains were grown by metallorganic chemical vapor deposition. Lasing in vertical direction occurs at low temperatures, indicating ultrahigh gains (∼ 105 cm−1) in the active region. Fabrication of an effective AlGaN/GaN distributed Bragg reflector with reflectivity exceeding 90% enables vertical lasing at room temperature in structures with a bottom distributed Bragg reflector, despite the absence of a well-reflecting upper mirror. The lasing wavelength is 401 nm, and the threshold excitation density is 400 kW/cm2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1188011
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  • 2
    Electronic Resource
    Electronic Resource
    Vögel als Biomonitoren für die Schadstoffbelastung von Landschaftsausschnitten — Ein Überblick (1985)
    Springer
    European journal of wildlife research 31 (1985), S. 22-33 
    Details
    ISSN: 1439-0574
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Summary Contaminant emissions affect inanimate objects, plants, animals and humans. Such emissions can be quantified with specialised measuring equipment — without any particular technical expenditure but, rather, exact both as regards time and area. Plants as biomonitors can integrate the quantity and effect of emissions at the defined site over broader periods of time. Thanks to their mobility animals provide additional possibilities of integration throughout different areas. For the wider utilisation of the advantages of biomonitors, the important thing is to recognise the regressions and correlations between emission rates for particular substances measured from the chemical/physical/technical standpoint in specific areas and periods of time and the concentrations of these substances in defined biological samples for the same areas and periods. On this basis there arise economical possibilities for extensive and revealing collection and review of area pattern and temporal trend of contaminant pollution, for interpolation between measuring stations or extrapolation beyond measuring networks, for early recognition of unknown terrain and, in addition, early warning in relation to humans and/or the used or protected components of ecosystems. Ecologists are required to interpret analyses and interrelations. Biomonitoring and specimen banking seem to be sensible concepts. Comparatively small research expenditure on the biological/ecological side could improve and deepen the existing state of things considerably. Bioindication and biomonitoring cannot, however, dispense with calibration through physical/chemical measurements.
    Abstract: Résumé L'émission de matières toxiques agissent sur les matériaux inanimés, les plantes, les animaux, les hommes. De telles émissions se prêtent à des mesures quantitatives au moyen d' appareils adéquats — sans poser de problèmes techniques majeurs mais avec une portée ponctuelle dans l' espace et dans le temps. Des plantes indicatrices peuvent intégrer des émissions ainsi que leurs effets à un endroit déterminé sur des périodes très longues. Les animaux, en raison de leur mobilité, procurent des possibilités d' intégration complémentaires sur des fractions de l' espace. Pour une utilisation plus large des avantages des bio-indicateurs, il convient de déceler les régressions et corrélations entre les mesures des taux d' émission techno-physico-chimiques, pour des matières déterminées au sein d' échantillons biologiques définis au cours des mêmes périodes et fractions de l'espace. Cette donnée de base fournit des possibilités appréciables en vue d'un contrôle extensif et cependant révélateur de points dispersés dans l'espace ainsi que de l'évolution au cours du temps de la charge que constituent les matières toxiques, en vue d'une interpolation entre les stations de mesure ou de l'extrapolation au-delà du réseau de contrôle, ceci de manière à disposer d'une information prémonitoire pour des zones non connues et, partant, d'une indication précoce intéressant la population ou/et les composants exploités ou protégés des écosystèmes. L'interprétation des résultats d'analyse et de leurs interrelations nécessitent des écologues. Le 〉biomonitoring〈 et le 〉specimen banking〈 apparaissent comme de judicieux concepts. Un investissement scientifique relativement modeste sur le plan éco-biologique pourrait améliorer et approfondir considérablement certaines évaluations. La bio-indication et le biomonitoring ne peuvent cependant pas renoncer à l'étalonnage sur base de mesures physico-chimiques
    Notes: Zusammenfassung Schadstoffimmissionen wirken auf unbelebte Stoffe, auf Pflanzen, Tiere und Menschen. Solche Immissionen lassen sich mit geeigneten Meßgeräten quantifizieren — ohne besonderen technischen Aufwand jedoch nur punktuell, in zeitlicher und räumlicher Hinsicht. Pflanzen als Biomonitoren können Immissionsmenge und -wirkung am definierten Ort über größere Zeitspannen integrieren. Tiere bieten durch ihre Beweglichkeit zusätzliche Integrationsmöglichkeiten über Raumausschnitte. Für die breitere Nutzung der Vorteile von Biomonitoren kommt es darauf an, die Regressionen und Korrelationen zwischen chemisch-physikalisch-technisch gemessenen Immissionsraten für bestimmte Stoffe in Zeit- und Raumausschnitten mit den Konzentrationen dieser Stoffe in definierten biologischen Proben für dieselben Zeit- und Raumausschnitte zu erkennen. Auf dieser Grundlage ergeben sich preiswerte Möglichkeiten zur extensiven und doch aussagekräftigen Erfassung und Überwachung von räumlichem Muster und zeitlichem Trend von Schadstoffbelastungen, zur Interpolation zwischen Meßstationen bzw. Extrapolation über Meßnetze hinaus, für erstes Erkunden von unbekanntem Terrain und darüber hinaus zur Frühwarnung in bezug auf den Menschen und/oder auf die genuzten oder geschützten Komponenten von Ökosystemen. Zur Interpretation von Analysen und Zusammenhängen sind Ökologen nötig. „Biomonitoring“ und „Specimen Banking“ erscheinen als vernünftige Konzepte. Vergleichsweise geringer Forschungsaufwand auf biologisch-ökologischer Seite könnte bestehende Ansätze wesentlich verbessern und vertiefen. Auf die Eichung durch physikalisch-chemische Messungen können jedoch Bioindikation und Biomonitoring nicht verzichten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02241560
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  • 3
    Electronic Resource
    Electronic Resource
    Radioimmunoassay for aminoterminal procollagen peptides in liver disease (1978)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 290 (1978), S. 151-152 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Prokollagenpeptiden ; Radioimmunoassay ; Lebererkrankung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00482309
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  • 4
    Electronic Resource
    Electronic Resource
    Einen einfachen Apparat zur Regulirung und Variirung des Luftdrucks bei Destillationen, Siedepunktsbestimmungen u. s. w. (1879)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 18 (1879), S. 574-576 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01345508
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  • 5
    Electronic Resource
    Electronic Resource
    Immunofluorescent localization of type-V collagen as a fibrillar component of the interstitial connective tissue of human oral mucosa, artery and liver (1986)
    Springer
    Cell & tissue research 243 (1986), S. 535-543 
    Details
    ISSN: 1432-0878
    Keywords: Type-V collagen ; Oral mucosa ; Artery ; Liver ; Man
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Polyclonal antibodies against native human typeV collagen were produced in rabbits and goats. Following purification, crossreaction of the antibodies with highly immunogenic peptides of basement membranes or the interstitial matrix was excluded on the basis of sensitive radioimmunoassays. These antibodies, when applied to cryostat sections of human oral mucosa, liver and arterial walls, never stained basement membranes as did antibodies against type-IV collagen or laminin. On the contrary, we observed delicate arborizing fibers in the interstitial compartment with extensions contacting structures such as subepidermal basement membranes. Arterioles contained a unilamellar sheath of longitudinally oriented fibers limited to the intimal layer. Larger arteries exhibited a multilamellar fibrous fluorescence over the whole intima, whereas the media showed a much weaker staining. The data identified type-V collagen as an interstitial fibrillar collagen rather than a basement membrane collagen, with a tissue pattern completely different from that of collagens types I, III, VI or fibronectin. A reinterpretation of the role of type-V collagen in connective tissue function is warranted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00218060
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  • 6
    Electronic Resource
    Electronic Resource
    Ein einfacher Apparat zur Regulirung und Variirung des Luftdrucks bei Destillationen, Siedepunktsbestimmungen u.s.w. (1879)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 195 (1879), S. 218-221 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.18791950107
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  • 7
    Electronic Resource
    Electronic Resource
    Komplexe mit N,N,N′,N′-Tetrakis(2-hydroxybenzyl)ethylendiamin (H4tben). Kristallstruktur von Ti(tben) (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 671-674 
    Details
    ISSN: 0044-2313
    Keywords: N,N,N′,N′-Tetrakis(2-hydroxybenzyl)ethylenediamine ; Complexes of Titanium(IV), Vanadium(IV), Manganese(IV), Tin(IV) ; Mass Spectra ; Mössbauer Data ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Complexes with N,N,N′,N′-Tetrakis(2-hydroxybenzyl)ethylenediamine (H4tben). Crystal Structure of Ti(tben)The complexes of N,N,N′,N′-tetrakis(2-hydroxybenzyl)-ethylenediamine with titanium(IV), vanadium(IV), manganese(IV), and tin(IV) were synthesized and characterized by mass spectrometry. The Mössbauer date were evaluated for the tin compound. The molecular structure of the titanium(IV) complex was determined by X-ray structural analysis, crystallographic data see “Inhaltsübersicht”.
    Notes: Es wurden die Komplexe von N,N,N′,N′-Tetrakis(2-hydroxybenzyl)ethylendiamin mit Titan(IV), Vanadium(IV), Mangan(IV) und Zinn(IV) hergestellt und massenspektrometrisch charakterisiert. Für die Zinn-Verbindung wurden die Mössbauer-Daten ermittelt. Die Molekülstruktur des Titan(IV)-Komplexes wurde röntgenstrukturanalytisch bestimmt. N,N,N′,N′-Tetrakis(2-hydroxybenzyl)ethylendiaminato(4-)titan(IV): Raumgruppe P21/c (Nr. 14), Z = 4, 3949 Zahl der beobachteten Intensitäten, R = 0,0539, Gitterabmessung bei 20°C; a = 10,447(3) Å, b = 20,668(5) Å, c = 13,420(3) Å, b̃ = 101,93(5) Å
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210428
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  • 8
    Electronic Resource
    Electronic Resource
    Reaktionen und thermisches Verhalten oxofreier Vanadium(IV)-Komplexe. Kristallstrukturen von Methoxo-oxo[thenoyltrifluoraceton-salicylhydrazonato(2-)]vanadium(V) und Methoxo-oxo[benzoylaceton-salicylhydrazonato(2-)]vanadium(V) (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 488-494 
    Details
    ISSN: 0044-2313
    Keywords: Vanadium(IV) complexes ; syntheses ; crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions and Thermal Behaviour of Nonoxo Vanadium(IV) Complexes. Crystal Structures of Methoxo-oxo[thenoyltrifluoroacetone-salicylhydrazonato(2-)]vanadium(V) and Methoxo-oxo[benzoylacetone-salicylhydrazonato(2-)]vanadium(V)The persistence of non-oxo vanadium(IV) complexes in dichlormethane/methanol/water solutions was studied by UV/VIS spectroscopy. The reaction products methoxo-oxo-[thenoyltrifluoroacetone-salicylhydrazonato(2-)]vanadium(V) and methoxo-oxo[benzoylacetone-salicylhydrazonato(2-)]vanadium(V) were isolated and characterized by X-ray analysis. The thermal behaviour of non-oxo vanadium(IV) complexes was checked.
    Notes: Die Beständigkeit oxofreier Vanadium(IV)-Komplexe mit dreizähnigen diaciden Liganden in Dichlormethan/Methanol/Wasser wurde UV/VIS-spektroskopisch untersucht. Als Reaktionsprodukte wurden Methoxo-oxo-[thenoyl-trifluoraceton-salicylhydrazonato(2-)]vanadium(V) sowie Methoxo-oxo-[benzoylaceton-salicylhydrazonato(2-)]vanadium(V) isoliert und röntgenstrukturanalytisch charakterisiert. Das thermische Verhalten der oxofreien Vanadium(IV)-Komplexe wurde analysiert.Methoxo-oxo-[thenoyltrifluoraceton-salicylhydrazonato(2-)]-vanadium(V), Raumgruppe P21/a2, Z = 4, 3 124 beobachtete unabhängige Reflexe, R = 0,0579, Gitterabmessungen bei 25°C; a = 800,0(2) pm, b = 2 027,3(6) pm, c = 1 165,0(3) pm, β = 109,03(2)° Methoxo-oxo-[benzoylaceton-salicylhydrazonato(2-)]vanadium(V) Raumgruppe P21/c, Z = 4, 2 312 beobachtete unabhängige Reflexe, R = 0,031, Gitterabmessungen bei 25°C: a = 1 122,6(1) pm, b = 772,96(9) pm, c = 2 021,2(4) pm, β = 95,32(1)°.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210327
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  • 9
    Electronic Resource
    Electronic Resource
    Compressive strength of edge-loaded corrugated board panels (1992)
    Springer
    Experimental mechanics 32 (1992), S. 259-265 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Postbuckling strength of simply supported corrugated board panels subjected to edge compressive loading has been studied experimentally using a specially developed test fixture. Although the load versus out-of-plane displacement response was highly sensitive to the presence of initial imperfections in the panels, the collapse loads did not vary much, which is attributed to the stable postbuckling behavior of the plates. Thin plates collapsed at nearly twice the buckling load, while thick panels collapsed at loads below the elastic critical buckling load. Local buckling of the facing on the concave side of the buckled plate was observed at load levels close to the collapse load. The plate collapse was triggered by compressive failure of the facings that initiated at the unloaded edges. A simplified design analysis was derived based on approximate postbuckling analysis and compared with an existing design formula for corrugated board panels and boxes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02319364
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  • 10
    Electronic Resource
    Electronic Resource
    Edge-compression fixture for buckling studies of corrugated board panels (1992)
    Springer
    Experimental mechanics 32 (1992), S. 252-258 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A test fixture, developed for evaluating the preand postbuckling response of simply supported, nearly flat, rectangular corrugated board panels subjected to edge compression is evaluated. The test fixture enables loading of panels into the postbuckling regime until collapse. The shadowmoiré method verified that buckling in the first mode occurred, and that there was symmetry of the adge-boundary conditions. Through an iterative regression model, experimental curves of load versus out-of-plane displacement for isotropic panels were fitted to an equation governing the nonlinear postbuckling response. This method provides the critical buckling load, a postbuckling parameter and the amplitude of initial imperfection of the panel. Comparison with analytical results revealed that simply supported boundary conditions were closely achieved. Examination of compressively loaded corrugated board panels showed that collapse occurred due to compressive failures of the facings in the highly stressed edge regions without severe influence from stress concentrations at load introduction and edge supports.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02319363
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