A new four-terminal-pair bridge, capable of achieving a relative standard uncertainty of 1×10-9, was constructed at the National Institute of Standards and Technology by converting a two-terminal-pair bridge. The conversion requires only the addition of components which are easily removed if two-terminal-pair measurements are to be made. The design and testing of this bridge is described. The n...

Bridges are the most important components in expansive transportation networks. And bridge management systems (BMS) have been developed to help government agencies maintain the bridges in their districts. However, bridge management systems vary with the different bridge types and the different management requirements for each maintenance level. The multi-level framework of a set of bridge manag...

This paper proposes new lossless passive soft switching methods for inverters developed from a synthesis procedure applicable to all PWM converters. The lossless passive soft-switching converter properties and synthesis procedure are described and extended here for inverters. Promising half-bridge and full-bridge soft-switching inverter examples are shown from the synthesis results. The voltage...

The desingularizations of the canonical components $$\textrm{SL}_2(\mathbb {C})$$ -character varieties arithmetic two-bridge link groups are determined.

The purpose of this study is to identify human walking vertical force by using FFT power spectrum density from the experimental acceleration data of the human body. An experiment on human walking is carried out on a stationary floor especially paying attention to higher components of dynamic vertical walking force. Based on measured acceleration data of the human lumbar part, not only in-phase ...

J. Hempel’s definition of the distance of a Heegaard surface generalizes to a complexity for a knot which is in bridge position with respect to a Heegaard surface. Our main result is that the distance of a knot in bridge position is bounded above by twice the genus, plus the number of boundary components, of an essential surface in the knot complement. As a consequence knots constructed via suf...

This paper summarizes the results of a comprehensive study carried out to assess the seismic response of a 59-span bridge, considering Soil-Structure Interaction (SSI). The bridge was built in the early seventies at a distance of about 5 km from a major fault. The methodology adopted to idealize the bridge and its foundation system for elastic and inelastic analysis is briefly described. The SS...