[1] All-sky imagers located at Tucumán, Argentina (26.9 S, 65 W, 14.2 S dip latitude), and Arequipa, Perú (16.5 S, 71.5 W, 2.7 S dip latitude), are used to track 630 nm airglow depletion motions in the first use of multisite airglow imagers for studies of low-latitude plasma dynamics. A new image analysis technique yields a consistent determination of nighttime zonal plasma drifts from all-sky ...

Frame structures equipped with steel plate shear walls (SPSWs) have been widely used in high-rise buildings due to their good seismic performance. In this study, the strip model and combined were analyze performance of SPSWs. Furthermore, an improved genetic algorithm (IGA) was established optimize frame for 5, 10, 20 stories. For each layer, layout optimization conducted determine best configu...

A new design for a DRIFTS cell for in-situ studies in heterogeneous catalysis is presented, which allows for improved reaction control (i.e., gas flow, temperature, minimized background conversion) and for precise kinetic measurements. Specifically, the very low background activity of the cell itself for CO and H2 oxidation makes it possible to study the preferential CO oxidation in H2-rich gas...

The isolation technique is widely studied and applied in structural engineering due to its excellent seismic performance. However, the existing research mostly focuses on conventional structure under action of regular ground motions. In this paper, a story-adding structure, base-isolated isolated were simulated by using numerical simulation methods. dynamic response characteristics three struct...

Spitzer observations of exoplanets routinely yield photometric accuracies of better than one part in 10,000. However, the attainable precision is limited in part by pointing drifts, which have the effect of moving the target to less stable or lesswell characterized regions of Spitzer’’s IRAC detector arrays. Here we examine a large sample of observing sequences in an effort to identify the caus...

As inelastic design for wind is embraced by the engineering community, there an increasing demand computational tools that enable investigation of nonlinear behavior wind-excited structures and subsequent development performance criteria. To address this need, a probabilistic collapse assessment framework steel proposed in paper. The based on integration high-fidelity fiber-based structural mod...