This study compares the performance of two smart isolation systems that utilize superelastic shape memory alloys (SMAs) for seismic protection of bridges using energy balance concepts. The first isolation system is a SMA/rubber-based isolation system (SRB-IS) and consists of a laminated rubber bearing that decouples the superstructure from the bridge piers and a SMA device that provides additio...

This paper presents a semiactive control strategy for the seismic protection of the phase II smart base isolated benchmark building subjected to near-fault earthquakes. Magnetorheological (MR) fluid dampers controlled by an optimal direct output feedback control algorithm with a voltage generator are used as semiactive control devices. The benchmark building is an eight-story base isolated buil...

A simplified method for the seismic design of low-rise, base-isolated shear wall structures is proposed in MOC-2012. This simplified method is basically a hybrid method, where the design of the isolation system is a simpler version for the static method available in US guidelines for the design of base-isolated structures and the design of the superstructure essentially is an improved version o...

A synthetic base of acetamide and salts in agar permitted isolation of small numbers of Pseudomonas aeruginosa from swarming Proteus and other gram-negative species.

A numerical analysis of the parameters of p-i-n diode microwave switches based on different semiconductor materials is presented. The Si, GaAs, 3C-SiC, 4H-SiC, 6H-SiC and GaN have been analyzed. The p-i-n diode parameters such as: series resistance, insertion loss and isolation have been studied. It is revealed that p-i-n diodes on the base of GaN permit to achieve the lowest value of junction ...

This paper proposes a fault detection method for hysteretic base-isolation systems. One of the key contr butions of this work is a Lyapunov-based restoring force observer that leads to the design of a robust fault detection scheme. The different fault types considered are stiffness and damping variations in the system. The proposed fault estimation method provides a direct estimate of the size ...

In this paper, an intelligent controller to control a smart base-isolated masonry structure is proposed. The smart base isolation consists of rubber bearings and a magnetorheological damper. This semi-active scheme takes advantage of the low power requirement of magnetorheological devices to achieve structural control. The controller is capable of mapping the behaviour of the controlled structu...

A probability-based active control synthesis is proposed for seismic base isolation of a structure that is modeled as a linear dynamical system subjected to uncertain future ground motions that are modeled as a stochastic process. The performance objective is the minimization of the probability of failure, where failure is defined as the first-passage of the system trajectory across a generaliz...

SITUATION Almost indisputable belief that base isolation hardware should separate a building from shaking ground just by definition is extremely appealing. The examples are numerous. Sometimes, it was even stated that seismic forces in base isolated structures could be reduced by factor of 66 in comparison with conventional construction (Tajirian et al. 1990), though the degree of promised miti...

A method for isolating bacteriophage T4 base plates from lysates of Escherichia coli B cells infected with the ts mutant in gene 19, ts B31 has been developed. By electrophoresis in polyacrylamide gel with sodium dodecyl sulfate the base plates have been shown to contain five to seven protein components with molecular weights of 36,000, 53,000, 66,000, 81,000, 87,000, and probably about 100,000...