The Delaware Memorial Bridge is a major suspension bridge that is critical to the tristate region of northern Delaware, southern New Jersey, and southeastern Pennsylvania. The Delaware Memorial Bridge consists of two ...
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(纸本)0309099862
The Delaware Memorial Bridge is a major suspension bridge that is critical to the tristate region of northern Delaware, southern New Jersey, and southeastern Pennsylvania. The Delaware Memorial Bridge consists of two nearly identical suspension bridges (hence, the nickname Twin Spans) that cross the Delaware River from southern New Jersey to northern Delaware. Field ambient vibration measurements of Structures 1 and 2 of the Delaware Memorial Bridge were conducted in June 2001 and September 2003. These measurements were used to derive the natural frequencies and modes of vibration for these structures. These field-measured frequencies and modes were then compared with each other and with computer-generated natural frequencies and modes of vibration derived for Structure 2 of the Delaware Memorial Bridge in 1997. Specifically, the 2001 seismometer-generated results for Structure 1 were compared with the 2003 accelerometer-generated results for Structure 1;the 2003 field-measured results for Structure 2 were compared with the 2003 field-measured results for Structure 1;and the 2003 field-measured results for Structure 2 were compared with the 1997 computer-generated results for Structure 2. Overall, these three types of comparisons indicated relatively good correlation for transverse motion but only fair correlation for longitudinal and vertical motion.
The steady national decline in women engineering students persists despite a plethora of program. and camps at engineering colleges around the country aimed at attracting girls into engineering and technical fields.1D...
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Liquid crystals (LC) have many applications in optics. Many electro-optical devices, like LC spatial light modulators (SLMs), take advantage of electrically controllable birefringence in LCs. LC SLMs are amazingly fle...
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Liquid crystals (LC) have many applications in optics. Many electro-optical devices, like LC spatial light modulators (SLMs), take advantage of electrically controllable birefringence in LCs. LC SLMs are amazingly flexible devices for controlling the phase and amplitude of light. Consequently, LC SLMs are being used for such techniques as wavefront sensing, emulating atmospheric turbulence, wavefront correction, beam steering, and holography. These techniques are often used in aerospace applications like laser weapons, free-space optical communications, satellite tracking, and satellite imagery. This paper highlights the use of LC SLMs for wavefront correction in a laser communication system and shows simulation results
Batteries and ultracapacitors have significantly different energy storage and power delivery capabilities. electrical traction motors in hybrid electric vehicles have characteristic power and energy demands, and a sin...
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Batteries and ultracapacitors have significantly different energy storage and power delivery capabilities. electrical traction motors in hybrid electric vehicles have characteristic power and energy demands, and a single energy storage technology may not be optimized to meet both the minimum power and energy demands. In this paper, we investigate the effect of combining batteries and ultracapacitors, both actively and passively, to produce a more versatile electrical energy storage system for hybrid electric vehicles. Hybridized energy storage systems result in increased component life cycles, decreased internal resistance losses, and reduced cost and mass when compared to either battery-only or ultracapacitor-only configurations
Neural prostheses have received considerable attention due to their potential to dramatically improve the quality of life of severely disabled patients. Cortically-controlled prostheses are able to translate neural ac...
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The rapid control of sonar-guided vehicles through obstacle fields has been a goal of robotics for decades. How sensory data is represented strongly affects how obstacles and goal information can be combined to select...
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The rapid control of sonar-guided vehicles through obstacle fields has been a goal of robotics for decades. How sensory data is represented strongly affects how obstacles and goal information can be combined to select a direction of travel. While typical approaches combine attractive and repulsive effects to directly determine steering, we are investigating an algorithm that evaluates multiple directions simultaneously followed by a winner-take-all (WTA) function which then guides steering. In this paper we describe a neuromorphic VLSI implementation of this algorithm using the inherent echo delay to create a range-dependent gain in a 'race-to-first-spike' neural WTA circuit. The chip was fabricated in a commercially-available 0.5 mum CMOS process and in this paper we present preliminary test results
The total dose radiation response of nitrided and nonnitrided n-type 4H-SiC is reported for metal oxide semiconductor capacitors exposed to 10-keV X-rays under positive bias. The radiation response is affected strongl...
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This paper discusses a study of the challenges and opportunities navigated by Anik Singal, a technology entrepreneur, during his senior year with the University of Maryland's Hinman CEOs program. The paper examine...
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