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  • 1
    Electronic Resource
    Electronic Resource
    Dilatometric and thermo-optic properties of alkaline earth and cadmium fluorides between 300 and 1300 K (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 2122-2128 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Temperature variation of the coefficients of linear thermal expansion and optical length was measured with an interferometer using 632.8 nm wavelength light from a He-Ne laser over the temperature range of 300–1300 K. The experiment was carried out under a high vacuum to minimize sample oxidation. For the optical length variation, the laser beam was allowed to pass through the crystals while, for the thermal expansion work, the laser beam was reflected from a coating of platinum deposited on the faces of crystals. Temperature variation of the coefficient of refractive index was calculated from the measurements of the coefficients of linear expansion and optical length variation. The results were used to calculate temperature variation of the optically important quantities such as molecular polarizability, energy band gap, refractive index variation with density, and the strain-polarizability parameter with the help of the Lorentz–Lorenz relation. The optical quantities exhibit a small variation over the temperature range of 300–∼800 K. The results were compared to the values in available literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358459
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  • 2
    Electronic Resource
    Electronic Resource
    New high-Tc cuprate (Tl1−xCrx) (Sr2−yBay)Ca2Cu3O9 (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 3034-3036 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new series of 1223-type (Tl,Cr)-based cuprates, (Tl,Cr)(Sr,Ba)2Ca2Cu3Oz, have been successfully synthesized and identified by powder x-ray diffraction and electron diffraction analyses. Ba partial substitution for Sr promotes the formation of (Tl,Cr)-based 1223-type compounds. Nominal samples, (Tl1−xCrx)-(Sr2−yBay) Ca2Cu3Oz, with 0.15≤x≤0.50 and 0.50≤y≤1.50 are pure or nearly pure 1223 phase and exhibit Tc(ρ=0) in the range of 104–114 K. This new (Tl,Cr)-based high-Tc material may be of importance in practical applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109130
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  • 3
    Electronic Resource
    Electronic Resource
    New 100 K TlSr2(Ca,Cr)Cu2O7 superconducting films (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 3057-3059 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: New TlSr2(Ca,Cr)Cu2O7 superconducting films on MgO(100) substrates have been prepared and characterized. The superconducting films were fabricated via a two-step process. Precursor SrCaCrCuO films were first deposited by spray pyrolysis at temperature of 350–400 °C, and thallium was then incorporated by heating the precursor films between unfired TlSrCaCrCuO bulk pellets at 880–900 °C in an oxygen atmosphere. The films were then cooled down to room temperature in an oxygen or argon atmosphere. The superconducting films were single 1212 phase with c-axis perpendicular to the surface of the MgO(100) substrates. Onset temperatures up to 110 K and zero-resistance temperatures up to 100 K were achieved. The critical transport currents (Jc) of the films were about 7×103 A/cm2 at 77 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106755
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  • 4
    Electronic Resource
    Electronic Resource
    EFFECT OF SEMI-PERCHED GROUND WATER ON MONITORING OF GROUND WATER LEVELS IN A DEVELOPED AQUIFER (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 36 (2000), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Interpretation of ground water level changes in a developed aquifer usually relies on reference to some benchmark such as “predevelopment” ground water levels, changes from fall to fall and/or spring to spring, or to determination of maximum stress during the pumping season. The assumption is that ground water levels measured in the monitoring well accurately reflect the state of the ground water resource in terms of quantity in storage and the effects of local pumping. This assumption is questionable based on the patterns shown in continuous hydrographs of water levels in monitoring wells in Nebraska, and wells installed to determine vertical gradients. These hydrographs show clear evidence for vertical ground water gradients and recharge from overlying parts of the aquifer system to deeper zones in which production wells are screened. The classical concept of semi-perched ground water, as described by Meinzer, is demonstrated by these hydrographs. The presence of semi-perched ground water (Meinzer definition, there is no intervening unsaturated zone) invalidates the use of measured ground water levels in regional observation programs for detailed numerical management of the resource. Failure to recognize the Meinzer effect has led to faulty management. The best use of data from the observation well network would be for detection of trends and education unless it is clearly understood what is being measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2000.tb05732.x
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  • 5
    Electronic Resource
    Electronic Resource
    Core Particle, Fiber, and Transcriptionally Active Chromatin Structure (1986)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Cell and Developmental Biology 2 (1986), S. 117-147 
    Details
    ISSN: 0743-4634
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.cb.02.110186.001001
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  • 6
    Electronic Resource
    Electronic Resource
    Semiconducting TlSr2RCu2O7 (R=rare earth) and its superconducting derivatives (1991)
    Springer
    The European physical journal 84 (1991), S. 349-352 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Semiconducting TlSr2RCu2O7 (R=Pr or Er) with a 1212-type structure has been synthesized in the single-phase form. Partial substitution of Sr2+ for R3+ converts this semiconductor to a 90 K superconductor TlSr2(R1−y Sr y )Cu2O7. A combination substitution, Sr2+ for R3+ and Pb4+ for Tl3+, leads to the Ca-free 100 K superconductor (Tl, Pb)Sr2(R, Sr)Cu2O7. The results are explained in the framework of the mixed Cu2+/Cu3+ valence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01314007
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis and superconductivity of a new 1222-type T1-based layered cuprate (T1, Nb) Sr2(Nd, Ce)2Cu2O z (1993)
    Springer
    The European physical journal 90 (1993), S. 19-22 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Synthesis and superconductivity of a new 1222-type layered cuprate (Tl1−x Nb x ) Sr2(Nd1−y Ce y )2Cu2O z have been studied. The structure of this cuprate is directly related to that of Nb-1222 NbSr2(Nd, Ce)2Cu2O z with tetragonal body-center lattice. Partial substitution of Tl for Nb in Nb-1222 phase improves its superconductivity. (Tl1−x Nb x ) Sr2(Nd0.75Ce0.25)2Cu2O z samples prepared by the typical procedure exhibit superconductivity withT c of 30–40 K. Effects of Tl and Nb on superconductivity of this cuprate are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01321028
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  • 8
    Electronic Resource
    Electronic Resource
    Selection for fresh weight in Arabidopsis thaliana under two mating systems (1972)
    Springer
    Theoretical and applied genetics 42 (1972), S. 75-80 
    Details
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Vier Rassen von Arabidopsis thaliana wurden verwendet, um zwei F 2-Populationen herzustellen, die als Ausgangspopulationen für Untersuchungen über künstliche Selektion dienten. Alle Pflanzen wurden unter sterilen Kulturbedingungen in kontrollierter Umwelt gezogen, das untersuchte Merkmal war das Frischgewicht nach 15tägigem Wachstum. In einem Teil des Versuchs wurden zwei Selektionsintensitäten auf jede der F 2-Populationen angewandt und die selektierten Eltern zufällig gepaart. Zusätzlich zur strengen Selektion wurde eine Gruppe zufallsgemäß ausgewählter Individuen als Kontrolle gezogen. Im zweiten Teil des Versuchs unterschied sich das Vorgehen vom vorigen nur dadurch, daß die zufällige Paarung durch Selbstbefruchtung ersetzt wurde. Für eine Population war der Selektionserfolg wie für ein Merkmal mit niedriger Heritabilität zu erwarten. Eine reguläre Antwort wurde auch für die andere Population beobachtet, wenn die Paarung zufällig erfolgte, jedoch zeigten die Ergebnisse der Selektion mit Selbstbefruchtung das Vorkommen von Dominanzeffekten an. Insgesamt wird gefolgert, daß Selektion verbunden mit zufälliger Paarung und Selektion verbunden mit Inzucht näherungsweise gleiche genetische Gewinne zur Folge hatten.
    Notes: Summary Four races of Arabidopsis thaliana were used to produce two F 2 populations and these constituted the base populations of an artifical selection study. All plants were grown under aseptic culture conditions in a controlled environment and the character studied was fresh weight after 15 days' growth. For one section of the study, two selection intensities were applied to each F 2 population and the selected parents were randomly mated. In addition to the high selections a group of random selections were maintained as a control. In the second section of the study the procedure differed only in that mating was by self-fertilization. For one population the selection response was as expected for a character of low heritability. A regular response was also observed for the other population when mating was at random, but the results for selection with self-fertilization indicated the presence of dominance effects. The overall conclusion was that selection with random mating and selection with self-fertilization produced approximately equal genetic gains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00277947
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  • 9
    Electronic Resource
    Electronic Resource
    Arguments against intermating before selection in a self-fertilising species (1974)
    Springer
    Theoretical and applied genetics 45 (1974), S. 157-162 
    Details
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The expected benefit from intermating the F 2 population from a cross of two homozygous parents is investigated. It is noted that intermating will only be of benefit for two loci if the alleles are initially in ths repulsion phase, and this result is extended to more than two loci by population simulation. If V n is the population variance after n cycles of intermating followed by repeated selfing, the merit of intermating is measured by the magnitude of V 1/V0. For a character controlled by loci on a short chromosome segment the ratio is invariably greater than 1.0, but as the average recombination value between loci is increased, either by increasing the chromosome length or by situating the loci on different chromosomes, individual values less than 1.0 become possible. If loci are spread over three or more chromosomes then the expected gain from intermating is consistently small. A simulation study shows that truncation selection is usually preferable to intermating as a procedure for increasing the proportion of desirable homozygotes in a population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00272820
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  • 10
    Electronic Resource
    Electronic Resource
    A comparison of four experimental designs for the estimation of heritability (1972)
    Springer
    Theoretical and applied genetics 42 (1972), S. 371-377 
    Details
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The partial diallel cross, the complete diallel cross, and the designs known as North Carolina Experiments 1 and 2 are compared for their usefulness in estimating heritability. It is first shown that reliable values for the sampling mean and variance of heritability estimates are obtained from approximate expressions based on the moments of the chi-square distribution. These expressions are then applied to determine the optimum experimental designs for a range of situations. The main basis for discrimination is the amount of information per unit, defined as i = 1/(N var(ĥ 2)), where ĥ 2 is the estimate of the heritability h 2 and N is the number of units in the experiment, either individuals or families. The two parameters considered were the heritability of individuals and the heritability of full-sib families, and for each of these the partial diallel cross was the most preferred, followed in decreasing order of preference by design NC2, the complete diallel, and design NC1. It is first shown that there is no optimum number of parents for a partial diallel cross or male parents for designs NC1 and NC2. The number of crosses per parent for a partial diallel or dams per sire for designs NC2 and NC2 should generally be six or less. Any expansion should be in the direction of using more parents in the case of the partial diallel, or more male parents in the case of designs NC1 and NC2. For the two heritability parameters considered in this study it is inefficient to increase the number of replicates beyond two.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275364
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