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  • 1
    Electronic Resource
    Electronic Resource
    Performance of heterojunction p+ microcrystalline silicon n crystalline silicon solar cells (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 6089-6095 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied by Raman spectroscopy and electro-optical characterization the properties of thin boron doped microcrystalline silicon layers deposited by plasma enhanced chemical vapor deposition (PECVD) on crystalline silicon wafers and on amorphous silicon buffer layers. Thin 20–30 nm p+ μc-Si:H layers with a considerably large crystalline volume fraction (∼22%) and good window properties were deposited on crystalline silicon under moderate PECVD conditions. The performance of heterojunction solar cells incorporating such window layers were critically dependent on the interface quality and the type of buffer layer used. A large improvement of open circuit voltage is observed in these solar cells when a thin 2–3 nm wide band-gap buffer layer of intrinsic a-Si:H deposited at low temperature (∼100 °C) is inserted between the microcrystalline and crystalline silicon [complete solar cell configuration: Al/(n)c-Si/buffer/p+μc-Si:H/ITO/Ag)]. Detailed modeling studies showed that the wide band-gap a-Si:H buffer layer is able to prevent electron backdiffusion into the p+ μc-Si:H layer due to the discontinuity in the conduction band at the amorphous-crystalline silicon interface, thereby reducing the high recombination losses in the microcrystalline layer. At the same time, the discontinuity in the valence band is not limiting the hole exit to the front contact and does not deteriorate the solar cell performance. The defect density inside the crystalline silicon close to the amorphous-crystalline interface has a strong effect on the operation of the cell. An extra atomic hydrogen passivation treatment prior to buffer layer deposition, in order to reduce the number of these defects, did further enhance the values of Voc and fill factor, resulting in an efficiency of 12.2% for a cell without a back surface field and texturization. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366479
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  • 2
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    HELPING EMPLOYEES RETIRE (1985)
    Saranac Lake, N.Y., etc. : Periodicals Archive Online (PAO)
    Management Review. 74:10 (1985:Oct.) 46 
    Details
    ISSN: 0025-1895
    Topics: Economics
    Notes: Features
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:7504-1985-074-10-000008
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of zero point motion on the hyperfine field at an interstitial positive muon site in ferromagnetic Ni
    Amsterdam : Elsevier
    Solid State Communications 31 (1979), S. 1003-1007 
    Details
    ISSN: 0038-1098
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0038-1098(79)90019-X
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  • 4
    Electronic Resource
    Electronic Resource
    Generalized susceptibilities and phonon anomalies in Pd and Pt metals
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 12 (1979), S. 140-148 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(79)90009-X
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  • 5
    Electronic Resource
    Electronic Resource
    Helicobacter pylori detection in human biopsies: a competitive PCR assay with internal control reveals false results (1999)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS immunology and medical microbiology 24 (1999), S. 0 
    Details
    ISSN: 1574-695X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: A polymerase chain reaction assay (PCR) for the diagnosis of Helicobacter pylori in human gastric biopsies was developed. To prevent false-negative results while performing PCR on human tissues, an internal control is necessary. Primer set ACT1-ACT2 which specifically amplifies a 542-bp fragment of the 16S rRNA gene of H. pylori was used. dUTP and hot-start were used to prevent false-positives from carryover of previous products and avoid non-specific extension products. A competitive internal control DNA fragment was constructed to detect the presence of inhibitors. Biopsies from 101 unselected patients with gastric symptoms were tested. PCR results were compared with results from microscopy of histological sections and conventional culturing for H. pylori. Forty-two percent of the biopsies were found to contain compounds inhibiting the PCR. The addition of the internal control assures the performance of the PCR assay and is an important quality control parameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-695X.1999.tb01283.x
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  • 6
    Electronic Resource
    Electronic Resource
    Hirnelektrische Untersuchungen bei Thalliumvergiftungen (1959)
    Springer
    Archives of toxicology 17 (1959), S. 252-258 
    Details
    ISSN: 1432-0738
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung In zwei Fällen von Thalliumvergiftung wurden über mehrere Monate die Hirnstrombilder kontrolliert. Bei beiden Vergifteten kam es hirnelektrisch zu schweren Allgemeinveränderungen. Im ersten Falle bildeten sich die Störungen nach Ablauf von 3 Monaten wieder zurück. Der zweite Fall zeigte eine wesentliche Verschlechterung. Hier kam es zwischenzeitlich zu herdförmigen Veränderungen und allmählich zur Ausbildung von Krampfstrompotentialen. Dieser krampfähnliche Zustand ließ sich hirnelektrisch schon erkennen, ehe es klinisch zu einem epileptiformen Anfall gekommen war. Hirnschäden nach der Thalliumvergiftung lassen sich hirnelektrisch erfassen. Für die Beurteilung der Prognose und der Arbeitseinsatzfähigkeit kann das EEG nach der Vergiftung sehr wertvoll sein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00577384
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  • 7
    Electronic Resource
    Electronic Resource
    The α-d-mannan core of a complex cell-wall heteroglycan of Trichoderma reesei is responsible for β-glucosidase activation (1995)
    Springer
    Archives of microbiology 164 (1995), S. 414-419 
    Details
    ISSN: 1432-072X
    Keywords: Key words Heteroglycan ; Cell walls ; 1 ; 6-α-d-Mannan ; Trichoderma ; Aspergillus ; β-Glucosidase ; Glycosidases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A heteroglycan responsible for the binding of the enzyme β-1,4-d-glucosidase (EC 3.2.1.21) to fungal cell walls was isolated from cell walls of the filamentous fungus Trichoderma reesei. The heteroglycan, composed of mannose, galactose, glucose, and glucuronic acid, also activated β-1,4-d-glucosidase, β-1,4-d-xylosidase and N-acetyl-β-1,4-d-glucosaminidase activity in vitro. The structural backbone of this heteroglycan was prepared by acid hydrolysis and gel filtration. The molecular structure of the core of the heteroglycan was determined by NMR studies as a linear α-1,6-d-mannan. The mannan core obtained by acid degradation stimulated the β-glucosidase activity by 90%. Several glycosidases from Aspergillus niger were also activated by the T. reesei heteroglycan. The β-glucosidase of Trichoderma was activated by mannan from Saccharomyces cerevisiae to a comparable extent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050283
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  • 8
    Electronic Resource
    Electronic Resource
    Electrical conductivity and dielectric loss studies of MoO 4 2- -doped NH4H2PO4 single crystals (1987)
    Springer
    Journal of materials science 6 (1987), S. 929-931 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01729871
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  • 9
    Electronic Resource
    Electronic Resource
    Electrical conductivity and dielectric loss studies of MoO 4 2- -doped KH2PO4 single crystals (1987)
    Springer
    Journal of materials science 6 (1987), S. 334-336 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01729345
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  • 10
    Electronic Resource
    Electronic Resource
    Tierexperimentelle Studien zum Problem der natürlichen Resistenz gegenüber bakteriellen Infektionen (1961)
    Springer
    Medical microbiology and immunology 148 (1961), S. 159-167 
    Details
    ISSN: 1432-1831
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung An 151 weißen Ratten wurde die Wirkung verschiedener Staphylokokkentoxine mit und ohne vorangehende Fremdeiweißsensibilisierung überprüft. Dabei kamen wir zu folgenden Ergebnissen: 1. Die intravenöse Injektion von partiell gereinigtemα-Toxin,β-Toxin und Enterotoxin blieb bei eiweißvorbehandelten (Gruppe I) und gesunden Tieren (Gruppe II) ohne klinisch erkennbare Folgen. Pathologischanatomisch fanden sich jedoch auch bei den Kontrolltieren (Gruppe II) Nierenveränderungen, wie sie in stärkerer Ausprägung nach Fremdeiweißsensibilisierung aufgefunden werden. Im nachfolgenden Infektionsversuch erkrankten die Ratten der Gruppe II mit wenigen Ausnahmen an einer Sepsis, so daß eine Minderung der natürlichen Resistenz durch die Toxineinwirkung angenommen werden darf. 2. Das Staphylokokkentoxin Behringwerke führte bei einer Dosierung von 0,4 ml/Ratte unterschiedlos bei eiweißvorbehandelten und nicht vorbehandelten Ratten zu schweren Krankheitserscheinungen mit letalem Ausgang. Die Dosis von 0,2 ml Toxin/Ratte wurde von den eiweißvorbehandelten Tieren wesentlich besser toleriert als von den gesunden Kontrolltieren. Danach hat die durch intravenöse Injektion von heterologem Protein bewirkte Durchbrechung der natürlichen Resistenz keinen Einfluß auf die Toxinempfindlichkeit der weißen Ratte. 3. Die Fähigkeit zur Antikörperbildung, beurteilt nach dem Verhalten des Staphylokokken-α-Antitoxintiters, wird durch die Fremdeiweißvorbehandlung merklich herabgesetzt. Dieser Befund deutet auf die Blockierung des RES und seiner keimvernichtenden Funktion hin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02153155
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