Reduced manning is the process (and the result) of removing human functions from a system while retaining or improving system operability and effectiveness. Reliability and maintainability characterize a system's ...
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Reduced manning is the process (and the result) of removing human functions from a system while retaining or improving system operability and effectiveness. Reliability and maintainability characterize a system's operability and effectiveness. Reduced manning impacts system reliability by changing the characteristics of (1) human error associated with system operation and maintenance, (2) time to repair failed components, and (3) mean-time-between-failures (MBTF) in a reduced manning environment. Simply reducing manning without compensating for system dependence on human involvement generally has a negative impact on system maintainability. Methods to address this include (1) human-system integration design of maintenance interfaces and (2) design of operations activities that are closely related to device failures. After demonstrating reliable performance through testing and operation, ship commanders can be assured that fewer people can effectively operate and maintain Navy ships and systems.
The recent introduction of IC technologies offering high frequency transistors with ft greater than 10 GHz has opened new opportunities for higher integration of wireless communication systems. Fast silicon IC devices...
作者：
ZHANG, DWLIANG, GCSHIH, CFJOHANSSON, MEWITHERS, RSConductus Inc.
969 W. Maude Avenue Sunnyvale California 94086 Mane E. Johansson received the BS degree in physics from University of Linkoping
Sweden in 1986 where she is now finishing her graduate courses. She joined Conductus Inc. in July 1992. She is currently section head for the device processing group at Conductus. This includes responsibility for process development and production of microwave and MRI/NMR devices and laser deposition of YBCO thin films. She has developed reproducible wet- and dry-etching techniques and passivation methods for processing of these devices. From 1989 to 1991 as a guest researcher at the National Institute of Standards and Technology she developed a process for fabrication of SNS junctions using high temperature superconducting thin films. Ms. Johansson also performed deposition and characterization of these materials. From 1991 to 1992 she was employed at Advanced Fuel Research East Hartford (3 where she was responsible for establishing the processing of YBCO IR-detectors on silicon. Previously she was employed in the microwave technology group at the National Defense Research Institute (FOA) Linkoping Sweden from 1986 to 1989. She developed fabricated and characterized passive microwave devices (based on normal metals).
In this article, we present forward-coupled microstrip filters designed using an integral-equation-based field solver, and fabricated in high-temperature superconducting (HTS) thin films. Two designs were studied, one...
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In this article, we present forward-coupled microstrip filters designed using an integral-equation-based field solver, and fabricated in high-temperature superconducting (HTS) thin films. Two designs were studied, one a nine-pole bandpass filter at 900 MHz with 25-MHz bandwidth, and the other a five-pole bandpass biter at 2 GHz with 24-MHz bandwidth and 10-Ohm resonator characteristic impedance. Both designs were fabricated using YBa2Cu3O7 (YBCO) HTS thin films. Measurements showed excellent agreements with the simulation predictions. For the nine-pole filter design, a measured insertion loss of 0.3 dB, and a measured return loss of 16 dB were achieved in the YBCO filter at 77 K. (C) 1995 John Wiley and Sons, Inc.
A laser cladding process has been developed and is now in production for the cladding of new aircraft carrier catapult components. The Service Life Extension Program (SLEP) Office of Naval Sea Systems Command (NavSea)...
A laser cladding process has been developed and is now in production for the cladding of new aircraft carrier catapult components. The Service Life Extension Program (SLEP) Office of Naval Sea Systems Command (NavSea) suggested that this process be utilized for the refurbishment of catapult tracks. Early experiments were conducted by the Naval Surface Warfare Center in conjunction with the IIT Research Institute. The program was then transitioned to the Applied Research Laboratory, Pennsylvania State University (ARL Penn State) under the sponsorship of the Naval Air Systems Command (NavAir)/Navy MANTECH program, thus providing an effective solution to a NavSea/NavAir interface hardware problem. ARL Penn State was responsible for the production and evaluation of six laser clad aircraft carrier catapult tracks as part of a program sponsored and funded by NavAir Code 5512. Six catapult tracks that had been taken out of service because of excessive wear were laser clad at the Westinghouse Electric Research and development Center (Now ''Science and technology Center'') for ARL Penn State. The composition of the clads was Inconel 625, Stellite 6/Stainless Steel 304, and Ferrelium 255. The tracks were machined and installed on the USS Constellation. Wear measurements were taken for the laser clad tracks and standard tracks ahead and behind the clad tracks. After 7,161 launches, the tracks were removed and returned to ARL Penn State for evaluation. The evaluation indicated that impact damage was observed on one track. No additional defects related to operations were found. Wear data indicated that the wear rate for it was 25%-50% less than non-clad. The results indicated that rejectable tracks (and one piece trough covers) could be successfully laser clad for extended operating life at acceptable costs. With emphasis for the future on a more affordable Navy, the need for viable refurbishment processes will be necessary for extending life and performance for the 21st century
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