Julius Verfasser, Henry P. Robinson, Anna Cosgrave, E. MacDowel Cosgrave, Drinkwater Butt, Geo. G. Rockwood,
... in Painting Still-Life, The Influence of Diaphragm Aperture in Half-Tone Work, The Itinerant Photographer, Indian ...
1895 - Gale Group | NCCO Photography
... polar diagram is the Fourier transform of an aperture distribution. By aperture distribution it is necessary to understand, in the two-dimensional case, distribution across the aperture of the component along the aperture plane of the electromagnetic field in the plane ... spectrum, except in the common case when the aperture may be considered more or less limited in ... evaluated at a point whose distance from the aperture is large compared with the width of the aperture (and the wavelength). For example, it is convenient ...
Tópico(s): Material Science and Thermodynamics
1950 - | Proceedings of the IEE - Part III Radio and Communication Engineering
(Smithsonian Contributions to Knowledge. [vol. xiv, art. 4]); Smithsonian Institution Publication 180 Book.
1864 - Gale Group | NCCO Photography
Harold Levine, Julian Schwinger,
... diffraction of a scalar plane wave by an aperture in an infinite plane screen is examined theoretically. ... expressed in terms of its values in the aperture, and constructed so as to vanish on the ... boundary condition. An integral equation to determine the aperture field is obtained from the continuity requirement for ... wave function on traversing the plane of the aperture. Utilizing the integral equation (whose solution is generally ... diffracted spherical wave at large distances from the aperture is exhibited in a form which is stationary ...
Tópico(s): Electromagnetic Compatibility and Measurements
1948 - American Institute of Physics | Physical Review
Charles Jewett, Carl Seiler, J. Gibbons Hunt, G. Richardson,
... of Societies, Polarization of Living Tissues, On the Aperture of Object-Glasses, How to Cut Sections of ... of an Object-Glass (Which Indicate an Erroneous Aperture beyond the True Angle), Consisted of a Clean ...
1876 - Gale Group | NCCO-STM 1of2
... transform of the tangential electric field in the aperture. The result is an integral equation for this ... be expressed as an integral equation for the aperture field. The power transferred through the aperture is calculated and cast in a variational form ... the real and imaginary parts of the exact aperture field. An aperture impedance is defined, whose real part (aperture resistance) is the ratio of the aperture scattering cross section to the geometrical cross section, ... the standing waves in the neighborhood of the aperture. Moreover, the ratio of the aperture resistance to ...
Tópico(s): Microwave and Dielectric Measurement Techniques
1949 - American Institute of Physics | Journal of Applied Physics
H. Watson, Frank L. James, Ernst Gundlach, G. W. Schramm,
... Hitchcock, Which Was a Lengthy Review on "Angular Aperture Defined", Transactions of Societies, Third Day, First Day, The January Number, Extra Numbers, Second Day, Angular Aperture, Fourth Day, The Evening Was Devoted to a ...
1878 - Gale Group | NCCO-STM 1of2
Chaang Huang, Ralph D. Kodis, Harold Levine,
The diffraction of plane electromagnetic waves by apertures in a plane screen which is infinitesimally thin and perfectly conducting is studied both theoretically and experimentally. The theoretical analysis employs a dyadic ... these formulas integral equations are obtained for the aperture distributions. The vector representation makes possible a compact ... by means of which one may extend the aperture analysis to complementary disks. The integral equations are ... used to construct a variational principle for the aperture transmission coefficient. Detailed analysis and numerical computations are ...
Tópico(s): Microwave and Dielectric Measurement Techniques
1955 - American Institute of Physics | Journal of Applied Physics
Ephraim Cutter, James Green, F. L. Bardeen, A. C. Stokes, Rev. J. D. King, J. Edwards Smith, J. Edwards Smith, Mary H. Wheeler, John Phin, J. Edwards Smith, Albert H. Tuttle, J. Edwards Smith, Grey Beard, George C. Hodges, L. F. Clarke, O. G. Mason,
... Angled Objectives, as Compared with Those of Medium Aperture. With Instructions as to the Selection and Use of American Object-Glasses of Wide Aperture. By J. Edwards Smith, M. D., Professor of ...
1881 - Gale Group | NCCO-STM 1of2
... on-axis gain of a uniformly illuminated rectangular aperture is derived which is valid in the "Optical ... by a correction factor which depends upon the aperture dimensions and the distance, R, from the aperture at which the gain is measured. A table ... the Fresnel integrals. The gain of a square aperture (LXL meters) in the Fresnel-zone region is compared with the gain of a circular aperture and it is shown that for apertures of equal Gsquare < Gcircle when (L2/λ) <R ≤( ... first order gain correction factor of a square aperture is equal to the gain correction factor of ...
Tópico(s): Photonic and Optical Devices
1956 - Institute of Electrical and Electronics Engineers | IRE Transactions on Antennas and Propagation
Dr. D. C. Hauxhurst, W. H. Dallinger, Allen Y. Moore, W. H. Hammond, W. H. Dallinger, Allen Y. Moore, W. G. Lapham, Melville Atwood, Charles Stodder, L. M. Willis, Allen Y. Moore,
... Hartnack and Prazmowski, Exchanges, Dr. Carpenter on Angular Aperture, How to Make an Aquarium of Microscopic Objects, Canada Balsam Microscopes, Oil Immersion Objectives, Correspondence Angular Aperture Again. Table of contents: Contents of This Number ...
1878 - Gale Group | NCCO-STM 1of2
Diffraction of a wave by an aperture of any shape in a thin screen is treated by a new method—``the geometrical theory of diffraction.'' This is an extension ... They are produced when incident rays hit the aperture edge and they satisfy the ``law of diffraction.'' ... is obtained for the field diffracted by any aperture. It yields the field in the aperture, the diffraction pattern and the transmission cross section. ... numerical results are given for slits and circular apertures. The accuracy of the results increases as the ...
Tópico(s): Photonic Crystals and Applications
1957 - American Institute of Physics | Journal of Applied Physics
Springer Link
F. H. Wenham, Prof. H. G. Hanks, L. R. Peet, Alexis A. Julien, L. M. Willis, M. Paul, Prof. Joseph Leidy, Dr. Charles Letourneau, A. W. Calhoun, Geo. E. Blackham, Geo. E. Blackham, Chas. S. Shultz, Romyn Hitchcock, R. Hitchcock, Ernest B. Stuart,
... Societies, On the Measurement of the Angle of Aperture of Microscope Object-Glasses, A Regular Meeting of ... Mounting Bottle for Canada Balsam, Amœba Proteus, Angular Aperture, Microscopical Section, Troy Scientific Association, The Regular Meeting ...
1878 - Gale Group | NCCO-STM 1of2
A. I. Mahan, C. V. Bitterli, S. M. Cannon,
... of the far-field diffraction pattern of an aperture bounded by arcs and radii of concentric circles ... of the far-field diffraction pattern of individual apertures bounded by arcs and radii of concentric circles, but also for combinations of such apertures over which the amplitudes and phases are constant but differ from aperture to aperture. With the aid of an IBM 7090 computer, ... far-field diffraction patterns of a 60° sector aperture, a semicircular aperture, and an aperture formed by arcs and radii ...
Tópico(s): Advanced Measurement and Metrology Techniques
1964 - Optica Publishing Group | Journal of the Optical Society of America
J. Howard Mummery, Mariana M. Tallman, J. A. Bates, S. G. S. Dicker, H. Muller, Herr Valenta, W. E. Debenham,
... Das Atelier Des Photographen, Editor's - Cabinet, Working Aperture V. Diaphragm Aperture. Frontmatter: The Photo-American. Display ads: Forbes Insoluble ...
1895 - Gale Group | NCCO Photography
Richard B. Kieburtz, Akira Ishimaru,
... screen containing a doubly periodic array of rectangular apertures. The differential-integral equation method of Copson is ... derive integral equations in the components of the aperture field. These are then solved approximately for normally ... excitation. A numerical solution is obtained for square apertures which is valid over the aperture resonance region, kd \approx 1.5 . Values of scattering cross section and plots of the aperture field are presented for aperture sizes larger, smaller, and near resonant dimensions. The ...
Tópico(s): Microwave Engineering and Waveguides
1962 - Institute of Electrical and Electronics Engineers | IRE Transactions on Antennas and Propagation
J. Edward Rosch, F. K. Hart, L. F. Hammer Jr., A. A. Bish, H. E. Niles, M. H. Albee, G. D. Obenchain, A. E. Oldham, Hector MacLean, F. L. Roy, C. Welborne Piper, Fred L. Roy,
... Screen Abuse, To the Photographers of Canada, The Aperture in Enlarging, The Rochester Section, British P. P. ... Silver Printing, The Measurement of the Effective Diaphragm Aperture, Death of Capt. Henry Lomb, Information, Saving Platinum ...
1908 - Gale Group | NCCO Photography
... the diffraction problems of circular, elliptical, and rectangular apertures for normally incident electromagnetic waves. As far as circular apertures are concerned, a simple formula can be derived ... transmission coefficient. This formula yields good results for apertures greater than 0.8\lambda . Even in the ease of elliptical apertures a simple formula can he derived for the diffraction pattern. For the elliptical aperture, as well as the rectangular one, the transmission ... transmission coefficients of the elliptical and the rectangular apertures as a function of the two aperture parameters. ...
Tópico(s): Near-Field Optical Microscopy
1968 - Institute of Electrical and Electronics Engineers | IRE Transactions on Antennas and Propagation
IEEE Xplore
J. J. Woodward, Thomas Bolton, Henry Davis, Prof. D. S. Kellicott, L. M. Willis, C. C. Merriman, Dr. Carl Seiler, F. H. Wenham, Lester Curtis, H. L. Smith, J. T. Brownell, W. G. Lapham, A. A. Starr, Wm. Ashburner, Samuel Lockwood, Lionel S. Beale, Clifford Mitchell, R. H. Ward, C. M. Vorce,
... Print, Corethra Plumicornis, A Micrometric Unit, Correspondence Measuring Aperture.—A Word for Mr. John Mayall, Jr., and ...
1879 - Gale Group | NCCO-STM 1of2
Kuni Ishihara, Hiroaki Ebara, Tadashi HlRASAWA, Tadaharu OGURA,
... between nitrogen content in leaf blades and stomatal aperture at different growth stages, by using rice plants ... stage (Table 2). On fine days the stomatal aperture was larger in higher nitrogen plot compared with ... the control especially from the morning until the aperture reached to the maximum of the day. After ... close in the afternoon the difference of stomatal aperture became very small or negligible due to more ... with lesser evaporation, the difference of the stomatal aperture between the two plots could be found from ...
Tópico(s): Agriculture, Soil, Plant Science
1978 - Crop Science Society of Japan | Japanese Journal of Crop Science