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  • 1
    Electronic Resource
    Electronic Resource
    Empirical pseudopotential calculations of Cd1−xMnxTe (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6939-6942 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Empirical pseudopotential calculations for the entire range of alloy concentrations of cubic Cd1−xMnxTe are presented. The atomic form factors have been deduced empirically by fitting the band structure to spectroscopic data available from the literature. The pseudopotential band structures indicate optical bowing may occur in the alloy Cd1−xMnxTe and have been used to determine the effective masses of the electron and light, and heavy holes, which for CdTe are in agreement with accepted values. The effective masses for Cd1−xMnxTe are given for the first time, and are expressed as first- and second-order polynomials in x. The implications of these results for spectroscopic experiments are discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361519
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  • 2
    Electronic Resource
    Electronic Resource
    The structural dependence of the effective mass and Luttinger parameters in semiconductor quantum wells (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 3414-3421 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A detailed comparison of the empirical pseudopotential method with single and multiple band calculations based on the envelope function and effective mass approximations are presented. It is shown that, in order to give agreement with the more rigorous microscopic approach of the pseudopotential method, structural dependent effective masses and Luttinger parameters must be invoked. The CdTe/Cd1−xMnxTe system has been employed as an example, and the first pseudopotential calculations of quantum wells and superlattices in this material are presented. It is shown that the electron, light- and heavy-hole effective masses tend towards twice their bulk values in the limit of narrow quantum wells. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365657
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  • 3
    Electronic Resource
    Electronic Resource
    Molecular cloning of the fdhF gene of Escherichia coli K-12 (1986)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 34 (1986), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The fdhF gene of Escherichia coli, coding for at least one component of benzyl viologen-linked formate dehydrogenase (FDH-BV) activity, was isolated on a ColE1-fdhF hybrid plasmid from the Clarke and Carbon colony bank.Endonuclease restriction maps of this plasmid and its pBR322-subcloned derivative, pLW06, were constructed. Various hybrid plasmids were further obtained by deletion of endonuclease-cleaved fragments from pLW06 DNA. Their complementation pattern was analyzed after introduction into different fdhF mutant strains. The fdhF gene was shown to be located on a 5.5 kb BamHI-PvuII-DNA fragment, which restored FDH-BV activity to the wild-type level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1986.tb01430.x
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  • 4
    Electronic Resource
    Electronic Resource
    Enzymatic and physiological properties of the tungsten-substituted molybdenum TMAO reductase from Escherichia coli (1999)
    Oxford BSL : Blackwell Science Ltd
    Molecular microbiology 32 (1999), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The trimethylamine N-oxide (TMAO) reductase of Escherichia coli is a molybdoenzyme that catalyses the reduction of the TMAO to trimethylamine (TMA) with a redox potential of + 130 mV. We have successfully substituted the molybdenum with tungsten and obtained an active tungsto-TMAO reductase. Kinetic studies revealed that the catalytic efficiency of the tungsto-substituted TMAO reductase (W-TorA) was increased significantly (twofold), although a decrease of about 50% in its kcat was found compared with the molybdo-TMAO reductase (Mo-TorA). W-TorA is more sensitive to high pH, is less sensitive to high NaCl concentration and is more heat resistant than Mo-TorA. Most importantly, the W-TorA becomes capable of reducing sulphoxides and supports the anaerobic growth of a bacterial host on these substrates. The evolutionary implication and mechanistic significance of the tungsten substitution are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2958.1999.01340.x
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  • 5
    Electronic Resource
    Electronic Resource
    The nik operon of Escherichia coli encodes a periplasmic binding-protein-dependent transport system for nickel (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 9 (1993), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The complete nucleotide sequence of the Escherichia coli nik locus, which has been suggested to encode the specific transport system for nickel, has been determined. It was found to contain five overlapping open reading frames that form a single transcription unit. Deduced amino acid sequence of the nik operon shows that its five gene products, NikA to NikE, are highly homologous to components of oligopeptide-and dipeptide-binding protein-dependent transport systems from several Gram-negative and Gram-positive species. NikA represents the periplasmic binding protein, NikB and NikC are similar to integral membrane components of periplasmic permeases, and NikD and NikE possess typical ATP-binding domains that suggest their energy coupling role to the transport process. Insertion mutations in nik genes totally abolished the nickel-containing hydrogenase activity under nickel limitation and markedly altered the rate of nickel transport. Taken together, these data support the notion that the nik operon encodes a typical periplasmic binding-protein-dependent transport system for nickel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1993.tb01247.x
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  • 6
    Electronic Resource
    Electronic Resource
    The hydC region contains a multi-cistronic operon (nik) involved in nickel transport in Escherichia coli
    Amsterdam : Elsevier
    Gene 107 (1991), S. 37-42 
    Details
    ISSN: 0378-1119
    Keywords: Gene cloning ; Southern blot ; cation transport ; chromosomal deletion ; fnr ; hydrogenase ; in vivo expression ; nikA ; nikB ; recombinant DNA ; traffic ATPase
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0378-1119(91)90294-L
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of Carbon Source on 〈i〉In Situ〈/i〉 Carbothermic Reduction Fabricating Steel-Bonded Cemented Carbide GT35 from Ilmenite (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1140-1142 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the present study, steel-bonded cemented carbide GT35 has been fabricated from naturalilmenite by in-situ carbothermic reduction and vacuum pressureless sintering. The effect of differentcarbon source on the mechanical properties and microstructure of GT35 composite was studied. Thequality of the composite synthesized from natural graphite is higher than those from other carbon source.Some good results were obtained from experiments: the density is about 6.2g/cm3, and the bendingstrength is 1390MPa, which higher than that of other samples. The structures and ingredient of differentcarbon source were analyzed to elucidate their different performance in the reactions
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1140.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of Mo(Ni) on Valence Electron Structures of TiC/Fe Cermets (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1119-1122 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Based on the empirical electron theory (EET) of solids and molecules, the valence electronstructures (VESs) of TiC-Mo(Ni)-Fe system were calculated by building proper structure model. Theresults indicate that additives of Mo and Ni improve the interface conjunction factors of the cermets indifferent ways. By adding Mo, the VESs of the ceramic phase are improved for the formation of the rimphase (Ti1-xMox)C, which leads to the enhancement of the interface conjunction, while the improvementof the VESs on metal phase by adding Ni is due to the formation of the Fe100-yNiy. Mo and Ni additivesincrease the interface electron density of cermets, that is, the adding of the Mo and Ni enhance theoverlapping grade of the electron cloud on interface and increase the binding energy of the interface,which is propitious to the wettability. The best wettability was found at x=0.5 or y=30
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1119.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of Heating Time on the Structural and Electrochemical Properties of LiFePO〈sub〉4〈/sub〉 by Molten Salt Method (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 299-301 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Well-crystallized LiFePO4 cathode materials were synthesized by NaCl-KCl molten saltmethod. The effect of heating time on the structure, morphology and electrochemical properties of thematerials were studied in detail. Single olivine-type LiFePO4 phase was obtained, and the morphologyand particle size of the powders could be controlled by changing the synthesis conditions. It was shownthat LiFePO4 cathode material synthesized at 680°C for 3h with the salt content N=2 (defining the molarratio of NaCl-KCl/LiFePO4 as N) had a narrow particle-size distribution and spherical or quasi-sphericalshape. Meanwhile, the tap density of the cathode material reached the maximum of 1.501gcm-3. Thecharge-discharge test indicated that the initial charge and discharge specific capacity reached 138mAhg-1and 125mAhg-1 respectively at the current density of 0.3mAcm-2
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.299.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Dynamic Recrystallization of Ferrite in a Low Carbon Nb-Microalloyed Steel (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 149-152 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The hot deformation behavior of a low carbon Nb-microalloyed steel is investigated by hot compression test in the ferrite phase region compared with a low carbon steel with similar compositions, and the effect of Nb on dynamic recrystallization of ferrite is analyzed. Results indicate that during hot deformation in the ferrite phase region, the effect of Nb solely depends on the size of NbC precipitates. Tiny particles which average size is about 7.5nm have a retarding effect on dynamic recrystallization process of ferrite, on the contrary, coarser particles which average size is about 30.6nm have a promoting effect and are of benefit to the refinement of recrystallized grains
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.149.pdf
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