A new method to interconnect PCB layers in GHz frequency range

2002 ◽  
Author(s):  
S. Kiani ◽  
M. Khusid
Keyword(s):  
New Method ◽  
Frequency Range

AFMAG—AIRBORNE AND GROUND

Geophysics ◽  
1959 ◽  
Vol 24 (4) ◽  
pp. 761-787 ◽  
Author(s):  
S. H. Ward
Keyword(s):  
Magnetic Fields ◽  
Broad Band ◽  
Primary Source ◽  
New Method ◽  
Mineral Deposits ◽  
Geophysical Prospecting ◽  
Frequency Range ◽  
Time Variance ◽  
Measuring Period ◽  
New Development

The existence of natural magnetic fields in the audio and subaudio frequency range has been known for some time. The primary source of energy for these fields is usually considered to be distant and local thunderstorms. Because of this origin, the fields are quasi‐random with both amplitudes and directions changing drastically over short periods of time. Hence, use of these fields in geophysical prospecting has been extremely limited. A new development, AFMAG, however, essentially eliminates the time variance in recording these fields without any sacrifice of the intelligence of their space variance. Since the space variance can be correlated with geologic features, AFMAG provides a new method of exploration with particular application to prospecting for conductive mineral deposits. Instrumentation of the AFMAG method currently is available for both ground and airborne operation; the tilt of the plane of polarization of the natural magnetic fields is recorded simultaneously at two frequencies. Examples drawn from airborne and ground surveys show that the method has a much greater depth of exploration than its conventional cousin, the induction electromagnetic method. Numerous other advantages, such as the possibility of choosing discrete operating frequencies over a broad band from 1 cps to 1,000 cps, are discussed. The chief disadvantage of the method lies in a sometimes restricted daily measuring period during which the fields are of an amplitude too low to permit measurement with current instrumentation; this is not a serious problem and is being minimized as the technology improves.

scholarly journals A Digital Heterodyne 2-150 kHz Measurement Method

2021 ◽  
Author(s):  
Paul Wright ◽  
Deborah Ritzmann
Keyword(s):  
Measurement Method ◽  
Power Grid ◽  
New Method ◽  
Digital Method ◽  
Frequency Range ◽  
Multi Resolution Analysis ◽  
Resolution Analysis ◽  
Conducted Emissions

This paper describes a new method for measurements of signals in the 2–150 kHz frequency range, as required to support the regulation of conducted emissions on the power grid. The digital method is based on heterodyning, decimation and multi resolution analysis.<div><br></div>

scholarly journals SEISMIC WAVEGUIDE OF METAMATERIALS

2012 ◽  
Vol 26 (17) ◽  
pp. 1250105 ◽  
Author(s):  
SANG-HOON KIM ◽  
MUKUNDA P. DAS
Keyword(s):  
Cylindrical Shell ◽  
Seismic Wave ◽  
Stop Band ◽  
Seismic Energy ◽  
New Method ◽  
Acoustic Metamaterials ◽  
Frequency Range ◽  
Helmholtz Resonators ◽  
Earthquake Resistant Design ◽  
Earthquake Resistant

We developed a new method of an earthquake-resistant design to support conventional aseismic system using acoustic metamaterials. The device is an attenuator of a seismic wave that reduces the amplitude of the wave exponentially. Constructing a cylindrical shell-type waveguide composed of many Helmholtz resonators that creates a stop-band for the seismic frequency range, we convert the seismic wave into an attenuated one without touching the building that we want to protect. It is a mechanical way to convert the seismic energy into sound and heat.

scholarly journals A New Method for Sound Generation Based on Digital Sound Reconstruction

2021 ◽  
Vol 29 (04) ◽  
Author(s):  
Dominik Mayrhofer ◽  
Manfred Kaltenbacher
Keyword(s):  
Sound Pressure ◽  
Low Frequency ◽  
New Method ◽  
General Idea ◽  
Sound Generation ◽  
Frequency Range ◽  
Numerical Investigations ◽  
Multiple Array ◽  
Depth View ◽  
Digital Sound

In this paper, we consider the general idea of Digital Sound Reconstruction (DSR) and analyze its inherent limitations. Based on this discussion, a new method which we call Advanced Digital Sound Reconstruction (ADSR) is introduced and analyzed in detail. This method aims to overcome the problems of classical DSR by introducing shutter gates and focuses on sound generation in the low-frequency domain. Combining the idea of classical DSR with a redirection mechanism leads to a gain of 20[Formula: see text]dB per decade regarding the sound pressure for decreasing frequency values. We present multiple array designs and possible embodiments for ADSR as well as an in depth view of excitation and optimization approaches. Finally, numerical investigations are used in order to demonstrate the potential of ADSR especially in the mid- to low-frequency range.

scholarly journals A New Method for Non-Invasive Measurement of Skin in the Low Frequency Range

2010 ◽  
Vol 16 (3) ◽  
pp. 143 ◽  
Author(s):  
Min Soo Kim ◽  
Youngchang Cho ◽  
Suk-Tae Seo ◽  
Chang-Sik Son ◽  
Hee-Joon Park ◽  
...  
Keyword(s):  
Low Frequency ◽  
New Method ◽  
Frequency Range ◽  
Non Invasive ◽  
Invasive Measurement
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