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  • 1
    Electronic Resource
    Electronic Resource
    An investigation of the diffusion of silicon in delta-doped gallium arsenide, as determined using high-resolution secondary ion mass spectrometry (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 821-826 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Silicon delta-doped samples of various densities were grown by molecular-beam epitaxy and analyzed using high-resolution secondary ion mass spectrometry. A marked difference was observed between profiles produced from samples doped below a surface density of 1.3×1013 cm−2, where all the silicon was incorporated on gallium sites, and highly doped samples, where autocompensation had occurred. All samples were grown at nominally 580 °C and all the doped planes showed some degree of broadening. A computer model of a two-step diffusion process was developed which produced a set of diffusion coefficients for the lower-doped samples. The diffusion coefficient associated with the post deposition growth for these low-doped samples was approximately 4.2×10−17 cm2 s−1. The more highly doped samples, because of their complicated profiles, were modeled using a graphical technique. This technique revealed the presence of a much larger diffusion coefficient, which is tentatively assigned to silicon diffusing as nearest-neighbor pairs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349640
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  • 2
    Electronic Resource
    Electronic Resource
    Hydrogen enhancement of silicon thermal donor formation (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 2081-2083 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Oxygen-related thermal donor formation in Czochralski silicon is characterized by the capacitance-voltage and deep level transient spectroscopy techniques as a function of 450 °C anneal time following hydrogenation. Increases in the formation rate and number of thermal donor (TD) defects found after hydrogenation are reported. This study finds an increase in TD+/++ concentration in the near-surface region at short anneal times, but at longer times an elevated concentration was not observed. No acceleration through the sequence of thermal donor defects was detected. This fails to support the model of hydrogen lowering the barrier to oxygen diffusion and accelerating the TDn→TDn+1 transitions. This study does, however, support a model in which the hydrogen increases the available thermal donor core sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109485
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  • 3
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    Randall, Weimer, and Greenfield, "Systems and Procedures for Automated Accounting" (Book Review) (1963)
    Menasha, Wis. : Periodicals Archive Online (PAO)
    The Accounting Review. 38:3 (1963:July) 673 
    Details
    ISSN: 0001-4826
    Topics: Economics
    Description / Table of Contents: Book Reviews, Stephen A. Zeff, Editor
    Notes: DEPARTMENTS
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:5030-1963-038-03-000043
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  • 4
    Electronic Resource
    Electronic Resource
    The interference of L-ascorbic acid with a standard histochemical azo dye coupling procedure (1972)
    Springer
    Histochemistry and cell biology 30 (1972), S. 273-276 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The reducing agent, L-ascorhic acid, has been shown to interfere with the chromogenesis of free Napthol AS D, and the diazonium salt, fast red violet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00277598
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  • 5
    Electronic Resource
    Electronic Resource
    The use of RAPD for verifying the apomictic status of seedlings of Malus species (1997)
    Springer
    Theoretical and applied genetics 95 (1997), S. 1080-1083 
    Details
    ISSN: 1432-2242
    Keywords: Key wordsMalus ; Apomixis ; RAPD ; Baskatong ; Red-purple pigmentation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The lack of red-purple pigmentation in seedlings obtained from crosses between M. cv Baskatong, carrying a dominant homozygous gene for red-purple pigmentation, and other species has been used for the detection of apomictic plants in Malus species. RAPD marker techniques were employed to evaluate the genetic similarity between putative apomictic seedlings and their female parents. From the selected set of 20 (OPA) primers about half were able to detect hybrids from the apomictic seedlings, if present. RAPD analyses confirmed the usefulness of the colour-marker gene in detecting the hybrids in vitro for seedlings of M. toringoides×M. cv Baskatong, but not for crosses involving M. hupehensis×M. cv Baskatong where in vitro colour-based selection was not possible (due to red stems in all cases). The set of primers (OPA-01, 02, 08, 09, 10, 12, 13, 14, 16, 18 and 20) clearly determined the hybrid nature of seedlings and allowed the selection of apomictic ones. Therefore, although cv Baskatong is useful as an indicator, these data show that this technique is not applicable in all cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050665
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  • 6
    Electronic Resource
    Electronic Resource
    Endosperm responses to irradiated pollen in apples (1987)
    Springer
    Theoretical and applied genetics 74 (1987), S. 508-515 
    Details
    ISSN: 1432-2242
    Keywords: Endosperm ; Pollen irradiation ; Malus ; Fluorometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The cytological effects of pollen γ-irradiation at 50 and 100 krad on both embryo and endosperm development were studied in Malus × domestica. Fruit and seed set were reduced by increasing doses of pollen irradiation, while embryo sacs resulting from the treatments differed in number and morphology of endosperm nuclei and in the presence or absence of an embryo. Nuclear abnormalities, distinguished from normal nuclear behaviour in embryo sacs derived from unirradiated pollen, included enhanced numbers of polyploid restitution nuclei, bridges between nuclei, excluded metaphase chromosome fragments and disrupted mitotic synchrony. Generally, a high dose of pollen irradiation (100 krad) generated an all-or-nothing response in the embryo sac, either creating highly abnormal embryos and/or endosperms which aborted, or showing relatively normal development. Callus produced from excised cellular endosperm differed in average genome size, that derived from 100 krad pollen being smaller than that from unirradiated pollen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00289830
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  • 7
    Electronic Resource
    Electronic Resource
    The induction of hexaploidy in cherry rootstocks using in vitro regeneration techniques (1987)
    Springer
    Theoretical and applied genetics 73 (1987), S. 589-594 
    Details
    ISSN: 1432-2242
    Keywords: Hexaploidy ; Cherry rootstocks ; In vitro regeneration ; Root callus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary An in vitro regeneration technique using root callus has been combined with colchicine application to produce hexaploid plants from the sterile triploid cherry rootstock Colt. Colchicine (50 mg/l) was applied together with auxin (IBA) (3 mg/l) either before or after root primordium formation in single excised micropropagating shoots. In both cases shoots were regenerated in vitro from the putative hexaploid roots. Both methods produced hexaploid plants but more than 70% of the regenerated clones were still triploid. The hexaploid plants were distinguishable from the triploids on morphological as well as cytogenetic grounds. Quantitative characters such as leaf length/breadth ratio, stomatal length and density in the hexaploids were significantly different from both regenerated and non-regenerated triploids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00289199
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  • 8
    Electronic Resource
    Electronic Resource
    Improving vehicle performance using adaptive control techniques (1999)
    Springer
    Artificial life and robotics 3 (1999), S. 236-241 
    Details
    ISSN: 1614-7456
    Keywords: Active suspension systems ; Anti-roll control ; Adaptive cruise control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract This paper reviews a collaborative research programme aimed at improving vehicle performance using adaptive control techniques. Initially the design of active suspension systems is considered, and the benefits of using a non-linear controller model with an adaptive control scheme are discussed. Adaptive schemes for active roll control are then considered, and the merits of incorporating a Smith predictor to accommodate for system delays are high-lighted. Preliminary research in adaptive cruise control and collision avoidance is discussed and plans for further developments are outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02481187
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  • 9
    Electronic Resource
    Electronic Resource
    Robot populations and their controlled evolution (2000)
    Springer
    Artificial life and robotics 4 (2000), S. 137-142 
    Details
    ISSN: 1614-7456
    Keywords: Autonomous robots ; Positive systems ; Reachability ; Controllability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract This paper reports recent results in controllability theory for a class of positive linear discrete-time systems which were employed to examine and analyse the reachability and controllability properties of cohort-type population models representing the dynamics of autonomous intelligent robot communities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02481334
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  • 10
    Electronic Resource
    Electronic Resource
    A biochemical study of non-specific esterases from plant cells, employing the histochemical substrate, naphthol AS-D acetate (1974)
    Springer
    Journal of molecular histology 6 (1974), S. 7-23 
    Details
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Synopsis The reagents routinely employed in the histochemical detection of nonspecific esterases, namely naphthol AS-D acetate and Fast Red Violet LB salt, have been used to study these enzymes biochemically with spectrophotometric procedures. A range of parameters that affect the coupling of the hydrolyzed substrate and diazonium salt were examined and their relevance to future histochemical procedures is noted. TheK m of broad-bean root-tip esterases was estimated to be approximately 0.07 mM, but other kinetic data suggest that the true value is lower. From an analysis of the kinetics of the hydrolytic reaction it appears that they are of a mixed nature over the time course and substrate concentrations used. The effect of pH on root tip esterase activity has been examined and the recorded optimum of 5.5 is similar to that reported by other workers for plant cells. Non-enzymic hydrolysis of the substrate at alkaline pH levels prevented measurement of enzyme activity beyond pH 7.2. Magnesium ions at a final concentration of 5 mM are important in retaining esterases in their natured state during enzyme extraction, although the addition of increasing amounts of the ion to the assay system caused a corresponding increase in esterase inhibition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01011534
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