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  • 1
    Electronic Resource
    Electronic Resource
    Iron-doped semi-insulating InP grown by chemical beam epitaxy (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 2336-2338 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have prepared Fe-doped InP epilayers by chemical beam epitaxy using a thermal atomic Fe beam. Epilayers having high resistivities ((approximately-greater-than)107 Ω cm) were obtained over a wide range of Fe concentrations. Resistivities as high as 1.3×108 Ω cm have been obtained. Such resistivity is almost equal to the theoretical value of 1.37×108 Ω cm that we estimate for intrinsic InP. The current-voltage characteristics exhibit both an ohmic and a space-charge-limited regime, and are consistent with the theory of single-carrier injection into a trap-free insulator. Pinning of the Fermi level near midgap by Fe-related deep levels is the mechanism by which the epilayer is made highly resistive. At room temperature, these traps are apparently deep enough that the carrier emission rate is negligible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101120
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  • 2
    Electronic Resource
    Electronic Resource
    Quantum shift of the optical absorption edge in ultrathin amorphous hydrogenated germanium (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 264-266 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The optical absorption coefficient in ultrathin (∼10 A(ring)) hydrogenated amorphous germanium (a-Ge:H) layers deposited on hydrogenated amorphous silicon layers was determined by in situ reflectivity measurements. The decrease in the absorption coefficient in the ultrathin a-Ge:H layers, compared to that of thick films, is explained by an upward shift in the conduction band edge due to quantum confinement of electrons with effective mass of 0.4m0.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98468
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of sputtering parameters on the magnetic properties of Mo-Permalloy (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5670-5672 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Sputtered Mo-Permalloy thin film is expected to possess great potentiality in soft magnetic properties which can be realized chiefly by controlling sputtering conditions. The effects of sputtering parameters, such as argon pressure, bias voltage, and preheating temperature, on the magnetic properties, of FeNiMo sputtered films have been investigated. The magnetic anisotropy field Hk was found to decrease with the raising preheating temperature while coercivity Hc presented the contrary trend. High effective permeability can be acquired at low argon pressure, adequate preheating temperature, and bias voltage. Close relationships among effective permeability, anisotropy field, magnetostriction coefficient, and half-height width Δθ50 were found. Annealing is available for increasing effective permeability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342269
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  • 4
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    Economic Change in Early Modern China: An Analytical Framework (1960)
    Chicago : Periodicals Archive Online (PAO)
    Economic development and cultural change. 9:1 Part 1 (1960:Oct.) 1 
    Details
    ISSN: 0013-0079
    Topics: Geography , Economics
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:5112-1960-009-01-000001
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  • 5
    Electronic Resource
    Electronic Resource
    The TFTR Lithium Blanket Module program (1985)
    Springer
    Journal of fusion energy 4 (1985), S. 57-77 
    Details
    ISSN: 1572-9591
    Keywords: blanket ; lithium ; neutronics ; tokamak ; tritium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The Lithium Blanket Module (LBM) is an approximately 80×80×80 cm cubic module, representative of a helium-cooled lithium oxide fusion reactor blanket module, that will be installed on the TFTR (Tokamak Fusion Test Reactor) in late 1986. The principal objective of the LBM Program is to perform a series of neutron transport and tritium-breeding measurements throughout the LBM when it is exposed to the TFTR toroidal fusion neutron source, and to compare these data with the predictions of Monte Carlo (MCNP) neutronics codes. The LBM consists of 920 2.5-cm diameter breeder rods constructed of lithium oxide (Li2O) pellets housed in thin-walled stainless steel tubes. Procedures for mass-producing 25,000 Li2O pellets with satisfactory reproducibility were developed using purified Li2O powder, and fabrication of all the breeder rods was completed in early 1985. Tritium assay methods were investigated experimentally using both small lithium metal samples and LBM-type pellets. This work demonstrated that the thermal extraction method will be satisfactory for accurate evaluation of the minute concentrations of tritium expected in the LBM pellets (0.1–1 nCi/g).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01051639
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  • 6
    Electronic Resource
    Electronic Resource
    The prebiotic synthesis of histidine and histidyl-histidine (1989)
    Springer
    Origins of life and evolution of the biospheres 19 (1989), S. 258-259 
    Details
    ISSN: 1573-0875
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02388839
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  • 7
    Electronic Resource
    Electronic Resource
    Prebiotic synthesis of imidazole-4-acetaldehyde, imidazole-4-glycol and imidazole-4-ethanol (1986)
    Springer
    Origins of life and evolution of the biospheres 16 (1986), S. 275-276 
    Details
    ISSN: 1573-0875
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02422023
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  • 8
    Electronic Resource
    Electronic Resource
    Strong duality for infinite-dimensional vector-valued programming problems (1989)
    Springer
    Journal of optimization theory and applications 62 (1989), S. 449-466 
    Details
    ISSN: 1573-2878
    Keywords: Cone concavity ; strong maximal points ; dual problems ; strong saddlepoints ; pseudotangent cones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract LetX,Y andZ be locally convex real topological vector spaces,A⊂X a convex subset, and letC⊂Y,E⊂Z be cones. Letf:X→Z beE-concave andg:X→Y beC-concave functions. We consider a concave programming problem with respect to an abstract cone and its strong dual problem as follows: $$\begin{gathered} (P)maximize f(x), subject to x \in A, g(x) \in C, \hfill \\ (SD)minimize \left\{ {\mathop \cup \limits_{\varphi \in C^ + } \max \{ (f + \varphi \circ g)(A):E\} } \right\}, \hfill \\ \end{gathered} $$ , whereC + denotes the set of all nonnegative continuous linear operators fromY toZ and (SD) is the strong dual problem to (P). In this paper, the authors find a necessary condition of strong saddle point for Problem (P) and establish the strong duality relationships between Problems (P) and (SD).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00939816
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  • 9
    Electronic Resource
    Electronic Resource
    The activity of flavone acetic acid (NSC 347512) on human colon cancer cells in vitro (1986)
    Springer
    Investigational new drugs 4 (1986), S. 289-293 
    Details
    ISSN: 1573-0646
    Keywords: flavone acetic acid ; cytotoxicity ; colon cancer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract Flavone acetic acid (FAA) was incubated for 1 to 48 hr with 3 established human colon cancer cell lines endowed with distinct degrees of phenotypic properties. All 3 lines responded to FAA in almost identical fashion; when incubated with the drug for only 1 hr, an initial decrease in survival was observed for concentrations of 250 μg/ml but no further increments in cytotoxicity were elicited when the concentration of FAA was augmented. Increasing the length of treatment yielded relatively modest increments (about 1 log) in cell killing only after an interval of 48 hr and only at the highest concentration (1000 μg/ml). Because of these relatively poor cytotoxic effects and because the therapeutic range of FAA is so narrow, we conclude that this agent will not be a valuable contribution to the antitumor arsenal, at least for colon cancer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00173501
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  • 10
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    A T-cell-specific transcriptional enhancer element 3' of C alpha in the human T-cell receptor alpha locus (1989)
    National Academy of Sciences
    Details
    Publication Date: 1989-09-01
    Description: A transcriptional enhancer element has been identified 4.5 kilobases 3' of C alpha (constant region alpha chain) in the human T-cell receptor (TCR) alpha-chain locus. This enhancer is active on both a TCR V alpha (variable region alpha chain) promoter and the minimal simian virus 40 promotor in TCR alpha/beta Jurkat and EL4 cells but is inactive on a V alpha promoter in human TCR gamma/delta PEER and Molt-13 cells, clone 13 B cells, and HeLa fibroblasts. The enhancer has been localized to a 116-base-pair BstXI/Dra I restriction enzyme fragment, which lacks immunoglobulin octamer and kappa B enhancer motifs but does contain a consensus cAMP-response element (CRE). DNase I footprint analyses demonstrated that the minimal enhancer contains two binding sites for Jurkat nuclear proteins. One of these sites corresponds to the CRE, while the other does not correspond to a known transcriptional enhancer motif. These data support a model in which TCR alpha gene transcription is regulated by a unique set of cis-acting sequences and trans-acting factors, which are differentially active in cells of the TCR alpha/beta lineage. In addition, the TCR alpha enhancer may play a role in activating oncogene expression in T-lymphoblastoid tumors that have previously been shown to display chromosomal translocations into the human TCR alpha locus.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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