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Executive Summary While Austin has a sizeable network of bicycle lanes, traditional bicycle facilities at intersections are often inadequate and can lead to unsafe interactions between motorists and bicyclists. One potential tool to alleviate this problem is the bicycle box. This device is intended to improve the predictability of bicyclist stopping… (More)
Executive Summary Census data and research surveys have shown that the number of trips made by bicycle in Austin is increasing. While Austin has a sizeable network of bicycle lanes, many gaps remain where roadways are too narrow to accommodate separated facilities. It is a considerable challenge to retrofit existing roadways to accommodate bicycles, so a… (More)
The laboratory performance of recently proposed new architectures for optical communication through distorting media is investigated. After phase-conjugating a weak beam with a mutually incoherent source a power amplification with a gain factor of 500 was demonstrated. The amplified beam can be employed for distortion-free optical communication by direct… (More)
The existing observational data for the binary pulsar PSR 1913 + 16 are sufficient to give a rather well-defined model for the system. On the basis of evolutionary considerations, the pulsar must be a neutron star near the upper mass limit of 1.2 solar masses (M.). The orbital inclination is probably high, i>/= 700, and the mass of the unseen companion… (More)
The basic principle and experimental results of applying a specific contact screen for performing multiplex holographic filtering in a real-time coherent optical correlator are presented. The specific design and fabrication of a 1- and 2-D gray density contact screen as well as a 2-D dichromated gelatin phase screen are described. The 2-D density-type… (More)
A lamellar grating has been developed to be used for very far ir observations on the Gerard P. Kuiper Airborne Observatory. The design characteristics and performance during laboratory testing and initial observations of Jupiter at wavelengths between 50 microm and 500 microm are presented.
The pulsating radio star reported by Hewish et al. (1) has been studied in the blue region of the optical spectrum and found to have a pulse amplitude less than 10 percent of the photon count expected for 18th magnitude. No upper limit to a sinusoidal oscillation less than or equal to a complete modulation can be set.
The period of optical pulsations from NP 0532 has been determined to within 3 nanoseconds on three different nights. The time rate of change of the period (dP/dt)(p) was 36.17 x 10(-9) second per day. The pulse shape was highly asymmetrical with strong indications of structure. The ratio of the amplitude of the main pulse to that of the interpulse varied… (More)
Highly sensitive polarization-controlled optical switching is demonstrated experimentally through a photorefractive BaTiO(3) double-phase-conjugate mirror. A theoretical explanation is developed, and possible applications are mentioned.