Generation of Arbitrarily-Oriented Ripple Images Using Circular-Sector-Type Smoothing Filter and Inverse Filter

A long‐spacing velocity log contains almost the same information as an ideal short‐spacing log, but in a distorted form with added noise. The distortion can be thought of as a moving average or smoothing filter. Its inverse, called a “sharpening” filter by astronomers, amplifies noise. If the inverse is to be useful, it must be designed with a balance between errors due to noise amplification and those due to incomplete sharpening. The Wiener optimum filter theory gives a prescription for achieving this balance. The result is called an optimum inverse filter. We have calculated finite‐memory optimum inverse filters using the IBM 704. We have applied them to actual data, digitized in the field, to produce synthetic short‐spacing velocity logs. These we have compared with their field counterparts. The synthetic logs have less calibration error and are free from noise spikes. The general agreement is good.

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A High Performance Energy Analyzer for Use in Electron Scanning Microscopy

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100061975 ◽

1969 ◽

Vol 27 ◽

pp. 14-15

Author(s):

A. V. Crewe ◽

M. Isaacson ◽

D. Johnson

Keyword(s):

High Performance ◽

Vertical Plane ◽

Median Plane ◽

Electron Gun ◽

Uniform Field ◽

Loss Mechanism ◽

Electron Scanning Microscopy ◽

Sector Type ◽

Double Focusing ◽

Electron Energy Loss

A double focusing magnetic spectrometer has been constructed for use with a field emission electron gun scanning microscope in order to study the electron energy loss mechanism in thin specimens. It is of the uniform field sector type with curved pole pieces. The shape of the pole pieces is determined by requiring that all particles be focused to a point at the image slit (point 1). The resultant shape gives perfect focusing in the median plane (Fig. 1) and first order focusing in the vertical plane (Fig. 2).

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An Energy Analyser for Contrast Enhancement in STEM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100052183 ◽

1974 ◽

Vol 32 ◽

pp. 434-435

Author(s):

H.T. Pearce-Percy

Keyword(s):

Contrast Enhancement ◽

Bending Angle ◽

Magnetic Sector ◽

Conventional Design ◽

Bending Radius ◽

Sector Type

Recently an energy analyser of the uniform magnetic sector type has been installd in a 100KV microscope. This microscope can be used in the STEM mode. The sector is of conventional design (Fig. 1). The bending angle was chosen to be 90° for ease of construction. The bending radius (ρ) is 20 cm. and the object and image distances are 42.5 cm. and 30.0 cm. respectively.

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Serial Processing FIR Inverse Filter Circuit

IEEJ Transactions on Electronics Information and Systems ◽

10.1541/ieejeiss.134.362 ◽

2014 ◽

Vol 134 (3) ◽

pp. 362-368

Author(s):

Kenji Takato

Keyword(s):

Inverse Filter ◽

Serial Processing

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4.Sound Field Reproduction Based on Inverse Filter

The Journal of The Institute of Image Information and Television Engineers ◽

10.3169/itej.68.612 ◽

2014 ◽

Vol 68 (8) ◽

pp. 612-615

Author(s):

Hiroshi Saruwatari

Keyword(s):

Sound Field ◽

Inverse Filter

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Accountability of Italian State-Owned Enterprises and Private-Sector-Type Financial Reporting: An Imperfect Match

SSRN Electronic Journal ◽

10.2139/ssrn.2153899 ◽

2012 ◽

Author(s):

Francesco Capalbo

Keyword(s):

Private Sector ◽

Financial Reporting ◽

Sector Type

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Miniaturized Wideband Loop Antenna Using a Multiple Half-Circular-Ring-Based Loop Structure and Horizontal Slits for Terrestrial DTV and UHD TV Applications

Sensors ◽

10.3390/s21092916 ◽

2021 ◽

Vol 21 (9) ◽

pp. 2916

Author(s):

Junho Yeo ◽

Jong-Ig Lee

Keyword(s):

Coplanar Waveguide ◽

Impedance Matching ◽

Circular Ring ◽

Loop Antenna ◽

Digital Television ◽

Loop Structure ◽

High Definition ◽

Circular Sector ◽

Feed Line ◽

Length Reduction

A miniaturized wideband loop antenna for terrestrial digital television (DTV) and ultra-high definition (UHD) TV applications is proposed. The original wideband loop antenna consists of a square loop, two circular sectors to connect the loop with central feed points, and a 75 ohm coplanar waveguide (CPW) feed line inserted in the lower circular sector. The straight side of the square loop is replaced with a multiple half-circular-ring-based loop structure. Horizontal slits are appended to the two circular sectors in order to further reduce the antenna size. A tapered CPW feed line is also employed in order to improve impedance matching. The experiment results show that the proposed miniaturized loop antenna operates in the 460.7–806.2 MHz frequency band for a voltage standing wave ratio less than two, which fully covers the DTV and UHD TV bands (470–771 MHz). The proposed miniaturized wideband loop antenna has a length reduction of 21.43%, compared to the original loop antenna.

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