A cost-effective modular phased array

2013 ◽  
Author(s):  
Richard Mayo ◽  
Stuart Harmer
Keyword(s):  
Phased Array ◽  
Cost Effective

Ultrasound and Nonlinear Resonant Testing of Nuclear Reactor Internals Bolts

2011 ◽  
Author(s):  
S. W. Glass ◽  
B. Thigpen ◽  
J. Renshaw
Keyword(s):  
Phased Array ◽  
Nuclear Reactor ◽  
Structural Integrity ◽  
Cost Effective ◽  
Life Extension ◽  
Safe Operation ◽  
Plant Life ◽  
Nuclear Plants ◽  
Bolt Failure ◽  
Reactor Internals

As many nuclear plants approach the end of their initial 40 year license period, inspection or replacement of their reactor internals bolts must be considered. This is consistent with the Materials Reliability Program (MRP 227/228) guideline for plant life extension [1,2]. Assurance of the internals structural integrity is essential for continued safe operation of these plants. If there is no suspicion or indication of bolt failure, simple inspection is normally more cost-effective than replacement. Inspection vendors have inspected thousands of internals bolts with conventional and Phased Array UT but different head configurations and bolt capture mechanisms mandate specific qualifications for each bolt type. In some cases, complex bolt and head geometries coupled with counter-bore and locking bar interferences render classical UT inspections difficult or impossible. A range of solutions to inspect reactor internals including these difficult-to-inspect-by-conventional-UT baffle bolts has been developed by several vendors [3]. This presentation references developments to make bolt inspection a relatively quick and easy task through adaptations to the SUSI submarine inspection platform, the extensive UT qualification work suitable for conventional UT plus more recent advanced nonlinear resonant techniques to distinguish between flawed or loose, vs. acceptable bolts where conventional UT cannot be applied. Initial evaluations show that these advanced techniques may have the ability to reliably detect smaller flaws than previously possible with conventional techniques as well as provide information on bolt tightness.

scholarly journals Construction of a Cost-Effective Phased Array Through High-Efficiency Transmissive Programable Metasurface

2020 ◽  
Vol 8 ◽  
Author(s):  
Anjie Cao ◽  
Zhansheng Chen ◽  
Kai Fan ◽  
Yuehui You ◽  
Chong He
Keyword(s):  
Phased Array ◽  
High Efficiency ◽  
Cost Effective

Cost-effective optical switch matrix for microwave phased array

1991 ◽  
Author(s):  
Jing-Jong Pan ◽  
Seung L. Chau ◽  
Wei-Zhong Li ◽  
Charles H. Grove
Keyword(s):  
Phased Array ◽  
Optical Switch ◽  
Cost Effective

Cost Effective Integration for Millimeter Wave Phased Array Apertures

2009 ◽  
Author(s):  
Marc Sherwin ◽  
Robert Howell ◽  
Christopher Kirby ◽  
Jeffrey Hartman ◽  
Eric Zirofsky
Keyword(s):  
Millimeter Wave ◽  
Phased Array ◽  
Cost Effective ◽  
Effective Integration

scholarly journals On the Alternate Transmission Mode for Polarimetric Phased Array Weather Radar

2015 ◽  
Vol 32 (2) ◽  
pp. 220-233 ◽  
Author(s):  
Valery M. Melnikov ◽  
Dušan S. Zrnić
Keyword(s):  
Phased Array ◽  
Cost Effective ◽  
Transmission Mode ◽  
Standard Errors ◽  
Pulse Switching ◽  
Ground Clutter ◽  
Polarized Waves ◽  
Repetition Time ◽  
Cost Effective Alternative ◽  
Long Pulse

AbstractPulse-to-pulse switching of polarizations (alternate transmission mode) is considered for polarimetric phased array radar (PAR). It is argued that the performance of the radar in terms of data quality should match or exceed the achieved standards of the Weather Surveillance Radar-1988 Doppler (WSR-88D). It turns out that the most stringent demand on the radar concerns the surveillance scan at the lowest elevations wherein the polarimetric variables are free of overlaid echoes, while ground clutter is significantly reduced. The scan uses a long pulse repetition time that has repercussion on the standard errors of the polarimetric variables and hence the choice of polarimetric mode. Herein the dwell time of this scan serves as a benchmark for comparisons of the accuracy of estimates. Because weather PAR should provide useful information at low signal-to-noise ratios (SNR) as low as those measured by the WSR-88D, the statistics of polarimetric variables, known at high SNR, is extended to low SNRs. It follows that the alternate mode would not match the performance of the simultaneous mode in the surveillance scans on the WSR-88D. Quasi-simultaneous transmission and reception of horizontally polarized and vertically polarized waves is discussed as a cost-effective alternative.

scholarly journals A 28 GHz 5G Phased Array Antenna with Air-Hole Slots for Beam Width Enhancement

2019 ◽  
Vol 9 (20) ◽  
pp. 4204 ◽  
Author(s):  
Hojoo Lee ◽  
Sungpeel Kim ◽  
Jaehoon Choi
Keyword(s):  
Phased Array ◽  
Cost Effective ◽  
Beam Width ◽  
Side Lobe ◽  
Array Antenna ◽  
Side Lobe Level ◽  
Phased Array Antenna ◽  
Half Power ◽  
Mobile Handset ◽  
Air Hole

In this paper, a 28 GHz fifth-generation (5G) phased array antenna with air-hole slots for beam width enhancement is proposed. The proposed antenna consists of eight dipole radiators on a mobile handset-sized ground with air-hole slots between the two adjacent elements for enhancing the half power beam width (HPBW) in the elevation plane. The dimensions of the proposed antenna are 130 mm × 42 mm × 0.127 mm. The proposed array antenna satisfies a −10 dB reflection coefficient in the frequency range from 27.2 to 29.2 GHz with a peak gain of 10.33 dBi and a side lobe level (SLL) of 13 dB. In addition to its good performance, the proposed antenna has a very wide HPBW (measured) in the elevation plane, up to 219 degree with a scan coverage of ±45 degree in the azimuth plane. The proposed antenna demonstrates excellent hemispheric beam coverage for 5G mobile handset devices and can enable cost-effective mass production.

Millimeter-Wave Cost-Effective Phased-Array Radar with Orthogonally Located Linear Tx and Rx Arrays

2019 ◽  
Author(s):  
Mitsuru Hiraki ◽  
Yuji Motoda ◽  
Tomoyuki Tanaka ◽  
Yoshiyuki Ota ◽  
Nobuyuki Morikoshi ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Phased Array ◽  
Cost Effective ◽  
Phased Array Radar

The application of electron microscopy to diagnosis in gynecologic neoplasms and tumor-like conditions

1984 ◽  
Vol 42 ◽  
pp. 102-105
Author(s):  
Lawrence M. Roth
Keyword(s):  
Electron Microscopy ◽  
Reproductive Tract ◽  
Malignant Tumors ◽  
Frozen Section ◽  
Cost Effective ◽  
Female Reproductive Tract ◽  
Ultrastructural Examination ◽  
Specific Diagnosis ◽  
Potential Value ◽  
Gynecologic Neoplasms

The female reproductive tract may be the site of a wide variety of benign and malignant tumors, as well as non-neoplastic tumor-like conditions, most of which can be diagnosed by light microscopic examination including special stains and more recently immunoperoxidase techniques. Nevertheless there are situations where ultrastructural examination can contribute substantially to an accurate and specific diagnosis. It is my opinion that electron microscopy can be of greatest benefit and is most cost effective when applied in conjunction with other methodologies. Thus, I have developed an approach which has proved useful for me and may have benefit for others. In cases where it is deemed of potential value, glutaraldehyde-fixed material is obtained at the time of frozen section or otherwise at operation. Coordination with the gynecologic oncologist is required in the latter situation. This material is processed and blocked and is available if a future need arises.

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