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Displaying 54526 - 54550 of 74337

Emergence, Creativity, and Computational Tractability in Shape Grammers

March 1, 1997
Author(s)
Scott Chase
Emergence supports creativity in that emergent features can be considered unanticipated or accidental. The body of shape grammar research over the past quarter century has demonstratated that, within a strictly circumscribed space of designs, it is

Entropy Theory and Glass Transition: A Test by Monte Carlo Simulation

March 1, 1997
Author(s)
J Baschnagel, M Wolfgardt, W Paul, K Binder
A generalized entropy theory of glass formation is developed by merging the lattice cluster theoryfor the thermodynamics of semiflexible polymer melts at constant pressure with the Adam-Gibbsrelation between the structural relaxation time and the

Evidence for Glass and Spin-Glass Phase Transitions From the Dynamic Susceptibility

March 1, 1997
Author(s)
D Bitko, S N. Coppersmith, R L. Leheny, S R. Nagel, T F. Rosenbaum, N Menon
We present evidence that there is a phase transition, with a diverging static susceptibility, underlying the transformation of a liquid into a glass. The dielectric susceptibility, at frequencies above its characteristic value, shows a power-law tail

Highly Selective Terahertz Optical Frequency Comb Generator

March 1, 1997
Author(s)
J Ye, L -. Ma, T Daly, John L. Hall
Using a 10.5 GHz resonant electro-optic modulator placed inside a resonant optical cavity, we have generated an optical frequency comb with a span wider than 3 THz. The optical resonator consists of three mirrors, with the output coupler being a thin Fabry

Hybrid Reinforced Precast Frame for Seismic Regions

March 1, 1997
Author(s)
J Stanton, William C. Stone, Geraldine S. Cheok
A precast, prestressed concrete framing system for resisting earthquake loads is described. The system uses both unbonded post-tensioned reinforcement and bonded bar reinforcement. Tests hve shown that its performance is equal or superior to that of a
Displaying 54526 - 54550 of 74337
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