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  • 2015-2019  (28)
  • 1990-1994  (35)
  • 1
    Electronic Resource
    Electronic Resource
    Determination of foreign atoms in Hg1−xCdxTe by means of flameless AAS (1992)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 343 (1992), S. 756-759 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The concentration of various foreign atoms in the compositional semiconductor Hg1−xCdxTe (x=0.2) has been determined by atomic absorption spectroscopy (AAS) and SIMS. The first problem of interest included the control of In doping of the (Hg,Cd)Te-melt solution and the epitaxial layers grown by step-cooling method. On the basis of analytical results it was possible to estimate the distribution coefficient k for the incorporation of indium into Hg1−xCdxTe. A value of k=3.2 has been found. This distribution coefficient did not change in the concentration range of In from 1×1016 atoms to 1×1018 atoms cm−3 in the melt solution. A distribution coefficient of about 3.0 was also determined by PIXE investigations. The second investigation concerned the level of background impurities in the bulk of HgCdTe crystals. The concentrations of some fast acceptors like Cu and Ag were determined. In the case of Ag it was confirmed, that the p-carrier concentration is influenced by the impurity level of Ag.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00633560
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  • 2
    Electronic Resource
    Electronic Resource
    Environmental contamination of amorphous Bi-Sr-Ca-Cu-O fibers (1991)
    Springer
    Journal of superconductivity 4 (1991), S. 311-313 
    Details
    ISSN: 1572-9605
    Keywords: Superconductivity ; environmental contamination ; amorphous ; YBa2Cu3O7-δ
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A study of the environmental contamination of amorphous YBa2Cu3O7-δ fibers has been undertaken in order to determine the best method to handle these materials during the fabrication of superconducting wire. The fibers often need to be handled in organic solvents as part of the cleaning and manipulating process. In organics that are free of water, the fibers retain their mechanical strength with little carbon contamination or other ill effects. Water, however, causes premature crystallization and destroys the mechanical strength of the fibers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618153
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  • 3
    Electronic Resource
    Electronic Resource
    Simulated performance and model measurements of an SIS waveguide mixer using integrated tuning structures (1992)
    Springer
    International journal of infrared and millimeter waves 13 (1992), S. 15-26 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A three-port approximation of the quantum mixer theory is employed to perform mixer gain calculations at 230 GHz for SIS junctions with integrated tuning structures. In addition, the embedding impedance range of a waveguide mixer mount has been obtained from model measurements and has been included in the gain calculations. The results show that even moderately small junctions can perform well in a waveguide environment when an integrated tuning structure is used. A three-element tuning circuit is presented that would allow broad band operation with a fixed embedding impedance which is important for applications using a planar antenna structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01011204
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  • 4
    Electronic Resource
    Electronic Resource
    Human population differentiation in the peri-Baltic Mesolithic: the odontometrics of Oleneostrovskii mogilnik (Karelia) (1992)
    Springer
    Human evolution 7 (1992), S. 33-48 
    Details
    ISSN: 1824-310X
    Keywords: Mesolithic odontometrics ; Olenii ostrov ; Skatenolm ; genetic divergence ; “Lapp” origins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Odontometric data are reported for Oleneostrovskii mogilnik, a Mesolithic cemetery in the Karelian USSR. Containing the skeletal remains of 148 individuals and dated to 7500b.p., it is the largest and oldest of the known peri-Baltic Mesolithic cemeteries. The dental data from this site are compared to those from Skateholm, where dental dimensions closely approximate the mean tooth sizes for all late Mesolithic European material. Olenii ostrov possesses a significantly smaller dentition, despite antedating the Skateholm sample by 1500 years. Geographic, archaeological, linguistic and ancillary dental data are discussed which argue strongly for the presence in Mesolithic northern Europe of at least two quasi-isolated human mating networks. One of these, documented by Olenii ostrov, may also represent the earliest evidence for the establishment in the taiga zone of populations whose descendants are the modern Saami (=”Lapps”).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436411
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  • 5
    Electronic Resource
    Electronic Resource
    Surface andinterface studies with perturbed angular correlations (1993)
    Springer
    Hyperfine interactions 78 (1993), S. 261-280 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The present status of surface, interface andthin film studies with perturbed γγ-angular correlation (PAC) spectroscopy is reviewed. Applications include adsorbate diffusion andstructural phase transitions on stepped metal surfaces, surface andinterface magnetism as well as compound formation at reactive metal/metal interfaces. First applications to semiconductor surfaces andmetal/semiconductor interfaces are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00568148
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  • 6
    Electronic Resource
    Electronic Resource
    Compound formation at Pd(100)/In interfaces (1993)
    Springer
    Hyperfine interactions 78 (1993), S. 309-314 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract PAC spectroscopy has been used to study the compound formation at the Pd(100)/In interface. Indium films of various thicknesses have been deposited onto Pd(100) single crystals. The111In PAC probes are either deposited on the Pd(100) surface before covering it with In or introduced into the In metal before producing the interface. Pd/In compounds with polycrystalline structure of various stoichiometry are identified from the detection of significant electric field gradient tensors after isochronal as well as isothemal annealing. In particular we find an ordered structure at the interface directly after In deposition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00568153
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  • 7
    Electronic Resource
    Electronic Resource
    Investigations on selected homologous liquid crystals and separation of their mixtures by SFC (1992)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 344 (1992), S. 460-462 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Systematic SFC experiments on five homologous 4-n-alkoxy-4′-cyanobiphenyls (with alkoxy = pentyloxy to nonyloxy) were performed to determine their capacity factors k'i in supercritical carbon dioxide on Perisorb A and RP-8; the temperature and pressure ranges were 305 to 335 K and 80 to 170 bar, respectively, corresponding to mobile phase densities of 0.35 to 0.85 g · cm−3. Analytical separations of six homologues (pentyloxy to decyloxy) on Spherisorb ODS-2 are also presented. For the measurements an SFC chromatograph with UV detection was used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323743
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  • 8
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    Taxonomic re-evaluation of species in Talaromyces section Islandici, using a polyphasic approach (2016)
    In:  Persoonia - Molecular Phylogeny and Evolution of Fungi (1878-9080) vol.36 (2016) p.37
    Details
    Publication Date: 2016-06-07
    Description: The taxonomy of Talaromyces rugulosus, T. wortmannii and closely related species, classified in Talaromyces sect. Islandici, is reviewed in this paper. The species of Talaromyces sect. Islandici have restricted growth on MEA and CYA, generally have yellow mycelia and produce rugulosin and/or skyrin. They are important in biotechnology (e.g. T. rugulosus, T. wortmannii) and in medicine (e.g. T. piceus, T. radicus). The taxonomy of sect. Islandici was resolved using a combination of morphological, extrolite and phylogenetic data, using the Genealogical Concordance Phylogenetic Species Recognition (GCPSR) concept, with special focus on the T. rugulosus and T. wortmannii species complexes. In this paper, we synonymise T. variabilis, Penicillium concavorugulosum and T. sublevisporus with T. wortmannii, and introduce four new species as T. acaricola, T. crassus, T. infraolivaceus and T. subaurantiacus. Finally, we provide a synoptic table for the identification of the 19 species classified in the section.
    Keywords: multi-gene phylogeny ; Penicillium rugulosum ; Penicillium variabile ; Talaromyces acaricola ; Talaromyces crassus ; Talaromyces infraolivaceus ; Talaromyces subaurantiacus
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
    Format: application/pdf
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  • 9
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    A taxonomic review of Penicillium species producing conidiophores with solitary phialides, classified in section Torulomyces (2016)
    In:  Persoonia - Molecular Phylogeny and Evolution of Fungi (1878-9080) vol.36 (2016) p.134
    Details
    Publication Date: 2016-06-07
    Description: The genus Torulomyces was characterised by species that typically have conidiophores consisting of solitary phialides that produce long chains of conidia connected by disjunctors. Based on the phylogenetic position of P. lagena (generic ex-neotype), the genus and its seven species were transferred to Penicillium and classified in sect. Torulomyces along with P. cryptum and P. lassenii. The aim of this study was to review the species currently classified in sect. Torulomyces using morphology and phylogenies of the ITS, BenA, CaM and RPB2 regions. Based on our results, we accept 16 species in sect. Torulomyces, including 12 new species described as P. aeris, P. austricola, P. cantabricum, P. catalonicum, P. oregonense, P. marthae-christenseniae, P. riverlandense, P. tubakianum, P. variratense, P. williamettense, P. wisconsinense and P. wollemiicola. In addition, we reclassify P. laeve and P. ovatum in sect. Exilicaulis and correct the typification of P. lagena. We provide descriptions and notes on the identification of the species.
    Keywords: beta-tubulin ; calmodulin ; Eupenicillium ; internal transcribed spacer rDNA region ; low temperature Scanning Electron Microscopy (cryo-SEM) ; Monocillium ; RNA polymerase II second largest subunit ; Trichocomaceae ; Wollemi pine
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 10
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    A taxonomic review of Penicillium species producing conidiophores with solitary phialides, classified in section Torulomyces (2016)
    In:  Persoonia - Molecular Phylogeny and Evolution of Fungi vol. 36, pp. 134-155
    Details
    Publication Date: 2024-01-12
    Description: The genus Torulomyces was characterised by species that typically have conidiophores consisting of solitary phialides that produce long chains of conidia connected by disjunctors. Based on the phylogenetic position of P. lagena (generic ex-neotype), the genus and its seven species were transferred to Penicillium and classified in sect. Torulomyces along with P. cryptum and P. lassenii. The aim of this study was to review the species currently classified in sect. Torulomyces using morphology and phylogenies of the ITS, BenA, CaM and RPB2 regions. Based on our results, we accept 16 species in sect. Torulomyces, including 12 new species described as P. aeris, P. austricola, P. cantabricum, P. catalonicum, P. oregonense, P. marthae-christenseniae, P. riverlandense, P. tubakianum, P. variratense, P. williamettense, P. wisconsinense and P. wollemiicola. In addition, we reclassify P. laeve and P. ovatum in sect. Exilicaulis and correct the typification of P. lagena. We provide descriptions and notes on the identification of the species.
    Keywords: beta-tubulin ; calmodulin ; Eupenicillium ; internal transcribed spacer rDNA region ; low temperature Scanning Electron Microscopy (cryo-SEM) ; Monocillium ; RNA polymerase II second largest subunit ; Trichocomaceae ; Wollemi pine
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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