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  • Articles  (2,095)
  • 2020-2023  (21)
  • 1990-1994  (2,074)
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  • 1
    Electronic Resource
    Electronic Resource
    Ozone gas-phase chemiluminescence for silane and its application to the determination of silicate in natural waters (1993)
    s.l. : American Chemical Society
    Analytical chemistry 65 (1993), S. 1814-1818 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00062a004
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Highly Diastereoselective Ring-Opening Reactions of Chiral Acetals with Secondary or Sterically Hindered Grignard Reagents (1994)
    s.l. : American Chemical Society
    The @journal of organic chemistry 59 (1994), S. 8192-8196 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00105a041
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  • 3
    Electronic Resource
    Electronic Resource
    Properties of the quantum wires grown on V-grooved Al0.3Ga0.7As/GaAs substrate by atmospheric pressure metalorganic chemical vapor deposition (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 3052-3054 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the successful growth of quantum wire (QWR) structures of AlxGa1−xAs/ GaAs /AlxGa1−xAs on a V-grooved Al0.3Ga0.7As/GaAs substrate. The samples are studied by photoluminescence spectra. The structures are grown by atmospheric pressure metalorganic chemical vapor deposition (MOCVD). The GaAs QWRs are fabricated on a V-grooved Al0.3Ga0.7As/GaAs substrate instead of GaAs substrate. Due to the effect of the Al0.3Ga0.7As layer, a necking area is formed in the side quantum wells (QWLs) near the bottom of the V groove. This results in a reduction of the lateral widths of the QWRs. Also, the luminescence of the QWRs is greatly enhanced in spite of low packing density. It is the first structure made in attempts to produce the quantum-size effects on a V-grooved substrate with non-(111) facets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110255
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  • 4
    Electronic Resource
    Electronic Resource
    Direct somatic embryogenesis and plant regeneration from protoplasts of Bupleurum scorzonerifolium Willd (1992)
    Springer
    Plant cell reports 11 (1992), S. 155-158 
    Details
    ISSN: 1432-203X
    Keywords: Bupleurum scorzonerifolium ; somatic embryogenesis ; plant regeneration ; protoplast
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Protolasts of Bupleurum scorzonerifolium were prepared from stem node-derived embryogenic calli with an enzyeme mixture, in which snailase was a necessary component. Follolwing cell wall regeneration protoplasts divided and directly formed somatic embryos which developed into plantlets. The conditions favorable to direct embryo formation were investigated, and the nature of the callus used for protoplast preparation was found to be a critical factor. The osmotic concentration and the composition of the culture medium including the phytohormone combinations were also important.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00232170
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  • 5
    Electronic Resource
    Electronic Resource
    Affects of graphite morphology and matrix structure on mechanical properties of cast ions (1990)
    Springer
    Journal of materials science 25 (1990), S. 1965-1972 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A comparative study of the affects of graphite morphology and matrix structure on mechanical properties was carried out on spheroidal, compacted and flake graphite irons by a short austenitizing plus austempering treatment. Transformation kinetic data showed that compacted graphite iron had the fastest, spheroidal graphite iron the second and flake graphite iron the slowest austenitizing rate. In spheroidal and compacted graphite irons the strength increased, while ductility decreased, with increasing the amount of bainite in matrix due to prolonging austenitizing time. On the other hand, the increase of bainite structure in the matrix had no significant affect on the mechanical properties of flake graphite iron. Fractographic examinations showed that the fracture surface of spheroidal graphite iron changed from a ductile mode to a brittle mode when its matrix changed from ferrite to bainite dominant. The flake graphite iron ruptured with brittle mode no matter what matrix it had. Compacted graphite iron exhibited an intermediate type of fracture surface. With a short austenitizing plus austempering treatment, the mechanical properties of spheroidal and compacted graphite irons could be improved and extended to a very wide range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01045750
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  • 6
    Electronic Resource
    Electronic Resource
    Capture by stabilized continuum: Classical and quantum aspects (1992)
    Springer
    Journal of statistical physics 68 (1992), S. 189-206 
    Details
    ISSN: 1572-9613
    Keywords: Laser-assisted atomic scattering ; stabilized continuum ; control of chaos ; wave packet propagation ; dressed molecular formation ; correspondence principle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We review here the results of our investigations concerning chaotic atomic scattering in the presence of a laser field. Particular emphasis is put on the existence of classical stable resonance structures, induced by the intense laser field, which are embedded in the field-free continuum. We show that phase space structures in the vicinity of a resonance island play an important role in the chaotic scattering behavior and form the basis for a mechanism to enhance the lifetimes of the collisional partners. Quantum calculations, based on a wave packet propagation method, show that quantum solutions are strongly influenced by the classical phase space structures. More specifically, a wave packet is found to spread differently in the regular and chaotic regions; in the latter case it spreads exponentially with time until saturation occurs, defining the saturation time. We also investigate theħ dependence of the spreading rates in both the regular and chaotic regimes. Calculations with an ensemble of classical trajectories are also presented to further illustrate the smoothing effects of varyingħ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01048842
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  • 7
    Electronic Resource
    Electronic Resource
    Somatic embryogenesis and plant regeneration from protoplasts isolated from embryogenic cell suspensions of wheat (Triticum aestivum L.) (1992)
    Springer
    Plant cell, tissue and organ culture 28 (1992), S. 79-85 
    Details
    ISSN: 1573-5044
    Keywords: plant regeneration ; protoplast ; somatic embryo ; suspension ; Triticum aestivum ; wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We describe the early formation of somatic embryos followed by plant regeneration from protoplasts isolated from an embryogenic wheat cell suspension, which was initiated from small granular (0.2 to 1 mm in size) embryogenic calli. These granular calli formed embryogenic cell suspensions within 20 days in liquid culture, and were selected gradually from young inflorescence-derived nodular embryogenic calli of the winter wheat cv. Kehong 1041. The division frequency of protoplasts was 11 to 16%, and the frequency of differentiation into plants was about 0.001% (number of plants formed divided by the total number of protoplasts plated). About 20% of somatic embryos present in the culture formed directly from protoplast-derived cells within 15 days of cultures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00039918
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis and properties of processable rigid polymers containing spiroacetal moieties (1991)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 192 (1991), S. 1033-1040 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A series of rigid rod-like polyspiroacetals bearing flexible side chains was prepared by interfacial polycondensation of 4,4′-(2,4,8,10-tetraoxaspiro[5,5]undecane-3,9-diyl)diphenol with 2,5-dialkoxy-substituted terephthaloyl dichlorides. The majority of these polymers were soluble in polar solvents like tetrahydrofuran (THF), dimethylformamide (DMF), CHCl3, phenol/CCl4 (1 : 1 by vol.) mixtures, etc. The molecular weights ranged from 7 600 to 15 000 and the melting temperature from 182 to 228°C. Both of the above values decreased with increasing length of the side chains. The TG curves revealed 5% weight loss at 350-370°C under N2 gas atmosphere. Wide-angle X-ray diffractograms showed that all of the polymers have considerable crystallinity at room temperature.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1991.021920502
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  • 9
    Electronic Resource
    Electronic Resource
    The research on the synthesis and structure of some new ferrocene derivatives (1992)
    Springer
    Hyperfine interactions 68 (1992), S. 265-268 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The reaction of C5H4RLi with FeCl2 gave nine new compounds of Fe(C5H4R)2 [R=C(CH3)2C6H4CH3-p(-m,-o), C6H10C6H5, C(Me)2C6C4OCH3-o, C6H10C6H4CH3-p(,-m,-o), C6H10C6H4OCH3-p]. The compositions of compounds were determined through elementary analysis. The structural determination was made by IR and H2NMR. Mossbauer spectia were taken at room temperature. The IS and QS values are 0.41–0.45mm/s and 2.3–2.5mm/s., respectively. The solid state structure of the complex has been determined by a single crystal x-ray diffraction study, crystal data for Fe[C5H4C(CH3)2C6H5]2: a=17.988(2)A, b=17. 411(2)A, c=7.496(1)A, α=β=90°, r=112.23°, Z=4, monoclinic form, space group C2/c. Our conclusions are: in π-acceptor ligand, the nucleophilic substituents decrease and the electrophilic substituts increase the metal to ligand electron cloud shift, which results in a decrease or an increase in the strength of the coordinate bonds and in the stabilization of the complexes by their steric effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02396487
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  • 10
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    Unknown
    5 - Coral reef social–ecological systems under pressure in Southern Sulawesi (2022)
    Elsevier
    In:  EPIC3Science for the Protection of Indonesian Coastal Ecosystems (SPICE), Science for the Protection of Indonesian Coastal Ecosystems (SPICE), Amsterdam, Netherlands, Elsevier, 457 p., pp. 143-199, ISBN: 978-0-12-815050-4
    Details
    Publication Date: 2022-03-04
    Description: Abstract Ecological and social processes of the Spermonde Archipelago, South Sulawesi, Indonesia, have been intensively studied during the Science for the Protection of Indonesian Coastal Ecosystems (SPICE) program. The archipelago is of specific interest to better understand how intensive exploitation of marine resources results in the degradation of reef systems. The projects specifically targeted (1) ecological processes in coral reefs, (2) genetic structure of populations, and (3) social–ecological dynamics relating to resource use, social networks, and governance structures. A modeling component emphasized (4) the integration of different ecological, social, and environmental components. Results indicated that reef resources in the Spermonde Archipelago are intensively exploited and further stressed by pollution effluents from hinterland processes. The lack of alternative livelihoods perpetuates dependencies within the patron–client system of the artisanal fisheries and supports high exploitation and also destructive resource uses. Greater inclusion of local stakeholders in the governance may result in better conservation practices, sustainable resource use, and improved livelihoods for the people. Abstrak Selama proyek SPICE, aspek ekologis dan sosial di perairan Kepulauan Spermonde, Sulawesi Selatan, Indonesia, dipelajari secara intensif. Kepulauan dan perairan ini mengundang banyak perhatian untuk lebih memahami bagaimana tingkat pemanfaatan sumber daya laut yang intensif berakibat pada degradasi sistem terumbu karang. Kerangka kerja proyek penelitian SPICE, secara khusus, menargetkan kajian-kajian mengenai (a) proses ekologis dalam sistem terumbu karang, (b) struktur genetik populasi untuk menentukan konektifitasnya, dan (c) dinamika sosial-ekologi yang berkaitan dengan penggunaan sumber daya, jejaring sosial dan struktur tata kelola. Komponen pemodelan juga dimasukkan kedalam kajian mengenai (d) integrasi berbagai komponen ekologi, sosial dan lingkungan dalam karakterisasi sistem sosial-ekologis. Hasil-hasil penelitian menunjukkan bahwa sumber daya terumbu karang di Kepulauan Spermonde sangat tereksploitasi dan terancam juga oleh limbah polusi dari proses di daratan. Kurangnya mata pencaharian alternatif memperkuat ketergantungan para nelayan tradisional pada sistem patron-klien dan meningkatkan penggunaan sumber daya yang tidak berkelanjutan dan merusak. Keikutsertaan pemangku kepentingan lokal yang lebih erat dalam tata kelola sumber daya alam Kepulauan Spermonde sangat memungkinkan hasil praktik konservasi yang lebih baik, penggunaan sumber daya berkelanjutan, dan peningkatan mata pencaharian bagi masyarakat.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Inbook , peerRev
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