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  • Articles  (64)
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  • 1
    Electronic Resource
    Electronic Resource
    High levels of gene flow in the surf bivalve Donax deltoides (Bivalvia: Donacidae) on the east coast of Australia (1997)
    Springer
    Marine biology 128 (1997), S. 83-89 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We surveyed patterns of allelic variation within twelve samples of the pipi Donax deltoides Lamarck from beaches separated by up to 1200 km but connected to varying degrees by the East Australian Current. We used these data to test the prediction that the irregular patterns of water movement would cause genetic differentiation in pipis, so that there would be more genetic variation within and among the more southern regions than the northern regions. We found that six loci were at least moderately variable within all samples, and there were no clear geographic patterns in allelic frequencies. In general, genotype frequencies within samples were consistent with predictions for an outcrossed, sexually reproducing species, and we detected no evidence of population subdivision. Within samples, with the exception of the peptidase loci, single-locus genotype frequencies were in close agreement with expectations for Hardy–Weinberg equilibrium. We observed no significant linkage disequilibrium for any pairwise comparison of loci in any sample. Our hierarchical analysis of genetic variation revealed little variation among all samples (F st = 0.009). Loci showed consistently low levels of subdivision (F st from 0.003 to 0.018). We found almost no variation among the four geographic regions sampled (F rt = 0.001). All variation was therefore attributable to variation among samples within regions (F sr = 0.010). These data imply that larvae are moving between regions and that levels of present or recent gene flow are high, and support the conclusions of other studies which have inferred widespread gene flow for animals dispersing via planktonic, outcrossed larvae in parts of this region. This implies that the East Australian Current is sufficient to produce strong larval connections despite its intermittent nature. If existing levels of population subdivision reflect current levels of gene flow, then these data imply that D. deltoides represents a single fishery on the east coast of Australia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050071
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  • 2
    Electronic Resource
    Electronic Resource
    In situ assessment of modification of sediment properties by burrowing invertebrates (1993)
    Springer
    Marine biology 115 (1993), S. 133-142 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Benthic organisms can significantly alter the physical properties of marine sediments, but it has hitherto been difficult to assess and quantify the effects of bioturbation. In situ geophysical techniques offer new methods for measuring these effects: measurement of acoustic shear-wave velocity and electrical resistivity allows nondestructive assessment of the properties of the grain framework and pore-fluid matrix, respectively, of the seabed sediment. The influence of burrowing invertebrates on the structural properties of sandy sediments at intertidal locations on the coast of Wales (UK) was investigated during the periol 1986–1987 using these techniques. Three species (Arenicola marina, Corophium arenarium and Lanice conchilega) were selected on the basis of their contrasting styles of burrow construction. All three species produced measurable and significant, although different, changes in bed properties. They modified shear-wave propagation through the bed by changing bed rigidity: while A. marina and C. arenarium decreased rigidity by creating open burrows, L. conchilega increased rigidity by building shell-lined tubes. All produced a decrease in electrical resistivity by altering porosity and/or tortuosity, which implies an increase in permeability; these changes were attributable not only to the presence of the burrows but also to modification of the between-burrow sediment texture and bed properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349395
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  • 3
    Electronic Resource
    Electronic Resource
    Erratum: "On the equation of motion of the underformed section of a Taylor impact specimen'' [J. Appl. Phys. 61, 499 (1987)] (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 2249-2249 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341699
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  • 4
    Electronic Resource
    Electronic Resource
    Fast electron transport and lower hybrid absorbed power profiles from hard x-ray imaging in the Princeton Beta Experiment-Modified (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 1548-1560 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recent hardware improvements on the hard x-ray camera of the Princeton Beta Experiment-Modified (PBX-M) expand the capabilities for observing bremsstrahlung radiation from fast electrons during lower hybrid current drive (LHCD) experiments, thereby allowing accurate fast electron transport studies. Developed methods to directly invert two-dimensional x-ray images reveal radial profiles of the emitted intensity and isotropy. Such profiles extracted from lower hybrid (LH) modulation experiments permit computation of the lower hybrid power absorption profile. Results from application to the LH phase scans demonstrate the ability to control the peak location of the driven current. Incorporating these results into simulations using both a three-dimensional Fokker–Planck code and a simple modulation model provides lower and upper bound estimates for the hot electron diffusion coefficient D*. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871484
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  • 5
    Electronic Resource
    Electronic Resource
    On the equation of motion of the undeformed section of a Taylor impact specimen (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 499-502 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper a one-dimensional analysis is presented that leads to the appropriate equation of motion for the undeformed portion of a plastic, rigid rod after impact with a rigid anvil. This equation is used as a basis for deducing material properties of the rod material from post-test measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338249
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  • 6
    Electronic Resource
    Electronic Resource
    Using internal fibre geometry to improve the performance of pin-loaded holes in composite materials (1996)
    Springer
    Applied composite materials 3 (1996), S. 117-134 
    Details
    ISSN: 1573-4897
    Keywords: optimization ; orientation ; design ; pin-loaded ; holes ; reinforcement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The anisotropic nature of fibre reinforced composites leads to large stress concentrations around pin-loaded holes through standard weave cloths. Proper understanding of how this anisotropic nature affects the load distribution around holes can be utilised to reduce these concentrations if sufficient thought is given to the internal fibre geometry near to the hole. Such local reinforcements need not be highly complex and can be readily produced without excessive effort, producing significant improvements in performance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00158997
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  • 7
    Electronic Resource
    Electronic Resource
    Biases in cold fusion data (1990)
    [s.l.] : Nature Publishing Group
    Nature 343 (1990), S. 703-704 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] JONES ET AL. REPLY - Freedman and Krakauer correctly state that by judi-ciously stopping a random Poisson process the experimenter can bias the count data to give an apparent statistically significant effect. The key to creating such a bias from a noise-only signal is that the deci-sion to stop ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/343703b0
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  • 8
    Electronic Resource
    Electronic Resource
    Sodium-dependent cysteine transport in human red blood cells (1979)
    [s.l.] : Nature Publishing Group
    Nature 279 (1979), S. 800-802 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 a, Time course of L-cysteine uptake by human RBCs in sodium () and choline medium (O). b, Concentration dependence of L-cysteine uptake by human RBCs in the presence () and absence of sodium (O). Freshly drawn human RBCs were washed three times in medium containing 150mM NaCl or choline Cl, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/279800a0
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  • 9
    Electronic Resource
    Electronic Resource
    Observation of cold nuclear fusion in condensed matter (1989)
    [s.l.] : Nature Publishing Group
    Nature 338 (1989), S. 737-740 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] When a current is passed through palladium or titanium electrodes immersed in an electrolyte of deuterated water and various metal salts, a small but significant flux of neutrons is detected. Fusion of deuterons within the metal lattice may be the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/338737a0
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  • 10
    Electronic Resource
    Electronic Resource
    On the optimal nose geometry for a rigid penetrator (1998)
    Springer
    Computational mechanics 22 (1998), S. 413-417 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A variational formulation for the net force on the nose of a rigid projectile normally penetrating a compliant target is given. Frictional effects are negligible in this formulation. The variational problem is solved and the result compared to several popular nose geometries. For blunt tipped projectiles, the optimal geometry can significantly enhance penetration by reducing the net force of resistance. For long penetrator noses, the effect has much less value. The most interesting conclusion is that all the optimal geometries have blunt tips.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004660050373
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