Field-portable, high-speed GC/TOFMS

Design and Analysis of a Portable High-Speed Clock Generator

A new portable clock generator with full pull-in range and fast acquisition is presented in this paper, where it can be developed at hardware description language (HDL) to reduce design cycle as well as improve system-level integration simulation. In the proposed design, frequency tracking is performed by the “Prune-and-Search” algorithm, and the digital-controlled ring oscillator is constructe...

A high-speed low-latency portable visual sensing system

West-east High Speed Flow Field Conference

The behavior of a variational multiscale LES model is studied for flows past bluff bodies. The circular cylinder is studied for a Reynolds 3900. Subgrid scale eddy viscosities of Smagorinsky, Vreman and the WALE model are compared. The vortex induced motion of a spar equipped with strakes and flexible mooring is then computed. The interest of variational multi-scale as compared to usual Large E...

Potential Field Navigation of High Speed

This paper proposes a potential field-based method for high speed navigation of unmanned ground vehicles (UGVs) on uneven terrain. A potential field is generated in the two-dimensional “trajectory space” of the UGV path curvature and longitudinal velocity. Dynamic constraints, terrain conditions, and navigation conditions can be expressed in this space. A maneuver is chosen within a set of perf...

3-D Numerical Investigation of Flow Field in Starting Stage of High Speed Wind Tunnels

High speed wind tunnels are widely used in the study of fluid flow behavior around various objects. The air flow in the starting step of supersonic wind tunnels is transient including strong shock waves caused by the interaction of the tunnel main stream and the boundary layer at walls. To arrive in running step, the tunnel must be designed so as these waves leave immediately the test section. ...