Pulse transmission system for measuring wave propagation in soils

Article Abstract:

A pulse transmission system was successfully employed in the concurrent measurement of P- and S-wave velocities in triaxial soils. The two P-waves measured by the system were consistent with the theoretical findings reported in previous studies. The approach, however, failed to emphasize measurement accuracy and the detailed characteristics of the frequency-selective filters used.

Usage, Measurement, Soils, Electric properties, Pulse techniques (Electronics), Wave propagation

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Quantum chemistry without wave functions: Two-electron reduced density matrices

Article Abstract:

A variational two-electron reduced density matrix (2-RDM) procedure, using first-order semidefinite programming, is presented to capture multireference correlation effects important at nonequilibrium geometries. This method emerged from research on a nonvariational calculation of the 2-RDM by the contracted Schrodinger equation.

Analysis, Electrons, Quantum chemistry, Schrodinger equation, Structure, Chemical properties

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Wave power goes commercial

Article Abstract:

The Island of Islay, Scotland, has begun to operate the world's first commercial wave power station using a device called the Land-Installed Marine-Powered Energy Transformer (Limpet). It is expected that enough power will be generated for around 400 homes. The article details the construction of Limpet and how it operates.

Other Electric Power Generation, Services development, Electric services, Scotland, Wave Power, Electric utilities, Services

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