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  • 1
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A compact coaxial electron cyclotron resonance (ECR) plasma source is built for plasma deposition experiments. The ECR plasma is produced in a coaxial line configuration and hence the source is compact. The plasma parameters (plasma density and electron temperature) are measured using a Langmuir probe. The plasma parameters are mainly dependent on the center conductor (stub) dimensions of the coaxial line. The characterization of plasma for both conical and cylindrical stubs is carried out and it is found that the conical stub produces relatively denser and more stable plasma than the cylindrical stub. The typical plasma density and electron temperature are 3×1010 cm−3 and 5 eV, respectively, for argon plasma. © 1996 American Institute of Physics.
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  • 2
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In this ECR ion source, the possibility of maintaining the plasma by slow wave structures (SWS), helical coil, and slotted line antennas, in the region where wce, wpe (very-much-greater-than) wrf (wce, wpe, and wrf are electron cyclotron, plasma, and microwave frequencies, respectively) is exploited. The plasma parameters, plasma density, and electron temperature are maximized by coupling microwave (frequency: 2.45 GHz; power: 650 W) at two places in a magnetic mirror machine (mirror ratio Rm (approximately-equal-to) 1.45) to obtain higher beam current. Initially, the plasma is produced by coupling microwave to SWS at the mirror throat. The microwave is coupled by exciting the dominant slow wave field component of SWS, using an E-plane horn antenna. Then the plasma is brought to the region wce, wpe (very-much-greater-than) wrf at the mirror throat by increasing the magnetic field. Simultaneously, the ECR region is shifted from mirror throat to the center where second microwave coupling is done at the resonant region using another horn antenna. The characterization of plasma parameters are presented for both helical coil and slotted line antennas. Enhancement of plasma parameters are observed in the present scheme. Also, the SLA is found to produce better plasmas (ne ∼ 7 × 1012 cm−3 and Te ∼ 12 eV) than the helical coil and hence the SLA is chosen for the ion beam characterization. The extracted ion beam current density in the present scheme is ∼25 mA/cm2 at 2-kV extraction voltage.
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 191 (1961), S. 1420-1420 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] While this new analysis in biometrical genetics may have some appeal, for its empirical value in particular, to those used to thinking only in terms of simple gene models and Mendelian ratios, it is, however, open to criticism on such grounds as the applicability of the method in general and its ...
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 191 (1961), S. 1123-1124 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The experimental material consisted of the random samples of single plants in the bulked F3, F5, JP6, F1Z, F15, and F18 generations along with all the thirty parents of the composite cross, all planted together in a five-times replicated randomized block design. Table 1 gives the estimates of ...
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 199 (1963), S. 407-408 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The observed proportion of male-steriles (ms ms) in various successive generations of the C.C.XIV and C.C.X V populations of barley are given in Table 1. From the- results on percentage seed-setting on the male-sterile plants their probability of outcrossing (kt) was found to be 0.42 and 0.36 in ...
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 214 (1967), S. 674-678 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] F-Statistics can be used to generalize models of genetic variation in natural populations. Models of this type can incorporate both selection and ...
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 209 (1966), S. 429-431 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Thus, Bodmer and Parsons5 concluded that "polymorphic over-dominant complexes have almost certainly evolved by the accumulation of linked interacting modifiers". Their theoretical analysis involved approximate solutions for the conditions and relative rates of gene frequency changes under one- and ...
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 200 (1963), S. 1340-1341 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Consider, for example, a large random mating population with the following adaptive values at an autosomal locus : Genotype AA Aa aa in females 1 1 1 + s in males 1 1 1 t (s, t 〉 0) Then, for s〉t〉s/l + 2s, there is stable equilibrium with heterozygosity: H = (s-t+ 2) (s-t) [8 + ...
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 217 (1968), S. 764-765 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] This basic model of Lewis and Crowe4 can be readily generalized for theoretical studies by simulation on digital computer. Assume that loci F and H are linked with recombination value c, hermaphrodites practise mixed selfing (s) and random outbreeding (t=1?s), and that Hh have higher self-fertility ...
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 221 (1969), S. 276-278 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. Map of California showing phenotypic variation in fifteen representative samples of A. barbata. (Vicinity code: 1, Willits; 2, Hopland; 3, Oroville; 4, Santa ftosa; 5, Auburn; 6, San Francisco; 7, Santa Cruz; 8, Sonora; 9, Monterey; 10, Santa Maria; 11, Sequoia Natl. Forest; 12, Los Padres ...
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