High Frequency of Extra-Pair Paternity in a Dense and Synchronous Population of Willow Warblers Phylloscopus trochilus

1997 ◽  
Vol 28 (4) ◽  
pp. 319 ◽  
Author(s):  
Gro Bjornstad ◽  
Jan T. Lifjeld
Keyword(s):  
High Frequency ◽  
Extra Pair Paternity ◽  
Phylloscopus Trochilus

High frequency of extra-pair paternity in an urban population of Cooper's Hawks

2015 ◽  
Vol 86 (2) ◽  
pp. 144-152 ◽  
Author(s):  
Robert N. Rosenfield ◽  
Sarah A. Sonsthagen ◽  
William E. Stout ◽  
Sandra L. Talbot
Keyword(s):  
High Frequency ◽  
Urban Population ◽  
Extra Pair Paternity ◽  
Cooper's Hawks

LOW FREQUENCY OF EXTRA-PAIR PATERNITY AND HIGH FREQUENCY OF ADOPTION IN BLACK-LEGGED KITTIWAKES

The Condor ◽  
10.1650/7337 ◽  
2004 ◽  
Vol 106 (1) ◽  
pp. 149 ◽  
Author(s):  
Fabrice Helfenstein ◽  
Claire Tirard ◽  
Etienne Danchin ◽  
Richard H. Wagner
Keyword(s):  
High Frequency ◽  
Low Frequency ◽  
Extra Pair Paternity

High Frequency of Extra-Pair Paternity in the Coal Tit

1999 ◽  
Vol 30 (2) ◽  
pp. 229 ◽  
Author(s):  
Thomas Lubjuhn ◽  
Thomas Gerken ◽  
Jorg Brun ◽  
Jorg T. Epplen
Keyword(s):  
High Frequency ◽  
Extra Pair Paternity ◽  
Coal Tit

scholarly journals High Frequency of Extra-Pair Paternity in Eastern Kingbirds

The Condor ◽  
2001 ◽  
Vol 103 (4) ◽  
pp. 845 ◽  
Author(s):  
Diane L. Rowe ◽  
Michael T. Murphy ◽  
Robert C. Fleischer ◽  
Paul G. Wolf
Keyword(s):  
High Frequency ◽  
Extra Pair Paternity

The high frequency of extra-pair paternity in tree swallows is not an artifact of nestboxes

1996 ◽  
Vol 38 (6) ◽  
pp. 425-430 ◽  
Author(s):  
C. A. Barber ◽  
Raleigh J. Robertson ◽  
Peter T. Boag
Keyword(s):  
High Frequency ◽  
Tree Swallows ◽  
Extra Pair Paternity

The Microstructure of Steatite (Protoenstatite)

1985 ◽  
Vol 43 ◽  
pp. 236-237
Author(s):  
W. E. Lee ◽  
A. H. Heuer
Keyword(s):  
High Frequency ◽  
Glass Ceramics ◽  
Magnesium Silicate ◽  
Beam Current ◽  
Glassy Matrix ◽  
Angle Of Incidence ◽  
X Ray ◽  
Mechanical And Electrical Properties ◽  
Argon Ions ◽  
High Temperature Polymorph

IntroductionTraditional steatite ceramics, made by firing (vitrifying) hydrous magnesium silicate, have long been used as insulators for high frequency applications due to their excellent mechanical and electrical properties. Early x-ray and optical analysis of steatites showed that they were composed largely of protoenstatite (MgSiO3) in a glassy matrix. Recent studies of enstatite-containing glass ceramics have revived interest in the polymorphism of enstatite. Three polymorphs exist, two with orthorhombic and one with monoclinic symmetry (ortho, proto and clino enstatite, respectively). Steatite ceramics are of particular interest a they contain the normally unstable high-temperature polymorph, protoenstatite.Experimental3mm diameter discs cut from steatite rods (∼10” long and 0.5” dia.) were ground, polished, dimpled, and ion-thinned to electron transparency using 6KV Argon ions at a beam current of 1 x 10-3 A and a 12° angle of incidence. The discs were coated with carbon prior to TEM examination to minimize charging effects.

Simulations of high-resolution images of amorphous silicon films

1986 ◽  
Vol 44 ◽  
pp. 544-545
Author(s):  
G. Y. Fan ◽  
J. M. Cowley
Keyword(s):  
Electron Microscope ◽  
High Frequency ◽  
Fourier Transformation ◽  
Amorphous Materials ◽  
Low Frequency ◽  
Chromatic Aberration ◽  
Structure Information ◽  
Frequency Components ◽  
High Resolution Images ◽  
Spatial Frequency Spectrum

It is well known that the structure information on the specimen is not always faithfully transferred through the electron microscope. Firstly, the spatial frequency spectrum is modulated by the transfer function (TF) at the focal plane. Secondly, the spectrum suffers high frequency cut-off by the aperture (or effectively damping terms such as chromatic aberration). While these do not have essential effect on imaging crystal periodicity as long as the low order Bragg spots are inside the aperture, although the contrast may be reversed, they may change the appearance of images of amorphous materials completely. Because the spectrum of amorphous materials is continuous, modulation of it emphasizes some components while weakening others. Especially the cut-off of high frequency components, which contribute to amorphous image just as strongly as low frequency components can have a fundamental effect. This can be illustrated through computer simulation. Imaging of a whitenoise object with an electron microscope without TF limitation gives Fig. 1a, which is obtained by Fourier transformation of a constant amplitude combined with random phases generated by computer.

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