نتایج جستجو برای: speed gap
تعداد نتایج: 343066 فیلتر نتایج به سال:
Capturing the dynamic electronic band structure of a correlated material presents a powerful capability for uncovering the complex couplings between the electronic and structural degrees of freedom. When combined with ultrafast laser excitation, new phases of matter can result, since far-from-equilibrium excited states are instantaneously populated. Here, we elucidate a general relation between...
Optical gap solitons, which exist due to a balance of nonlinearity and dispersion due to a Bragg grating, can couple to acoustic waves through electrostriction. This gives rise to a new species of "gap-acoustic" solitons (GASs), for which we find exact analytic solutions. The GAS consists of an optical pulse similar to the optical gap soliton, dressed by an accompanying phonon pulse. Close to t...
The propagation of sound waves and electromagnetic radiation in a background medium is strongly innuenced by the addition of random scatterers. We study random perturbations of a background medium which has a spectral gap in its permissible energy spectrum. We prove that the randomness localizes waves at energies near the band edges of the spectral gap of the background medium. The perturbation...
The speed of new VLSI designs is rapidly increasing. Assuring the performance of the circuit requires that the circuit be tested at its intended operating speed. The high cost of high speed testers makes it impossible for the testers to follow the designs in terms of speed increase. This gap between the speed of the new circuits and the speed of the testers is not likely to disappear. In this p...
Four big brown bats (Eptesicus fuscus) were challenged in an obstacle avoidance experiment to localize vertically stretched wires requiring progressively greater accuracy by diminishing the wire-to-wire distance from 50 to 10 cm. The performance of the bats decreased with decreasing gap size. The avoidance task became very difficult below a wire separation of 30 cm, which corresponds to the ave...
While the discourse of international development has begun to recognise the potential of involving diaspora as agents of change, issues of sustainability and environmental impact are often missing from the assessment of outcomes and impact in the Global South. The purpose of the conference was to explore three terms: “development”, “sustainability” and “diaspora” which are often seen as separat...
The present contribution tests whether countries can be pooled when studying the financegrowth nexus. Overall, our results point toward a ‘pragmatic’ positive answer, though considerable heterogeneity is present among developing countries. JEL codes: C23, O16
T his year’s World Water Day focused on the food-water nexus with the theme “Water and Food Security: The World is Thirsty Because We are Hungry.” While much of the emphasis under this theme focused on the quantities of water used for food produc tion, the quality of water is also important to that function. Water quality can also have sig nificant effects on health. In this context, the qual...
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