A new wind tunnel for experiments on bird flight was completed at Lund University, Sweden, in September 1994. It is a closed-circuit design, with a settling section containing five screens and a contraction ratio of 12.25. The test section is octagonal, 1.20 m wide by 1.08 m high. The first 1.2 m of its length is enclosed by acrylic walls, and the last 0.5 m is open, giving unrestricted access....

abstract alluvial fans are the most striking phenomena o fluvial geomorphology . these forms are found in frount of mountains and pediments of arid and semiarid zones . alluvial fans are affected by climate changes and tectonics . occurring of tectonic events lead to reaction of alluvial fans . some of these reactions appear on dissection of alluvial fans and displacement of depocenters on allu...

We present a scalable high-speed divide-by-N frequency divider using only basic digital CMOS circuits. The divider achieves high-speed operation using a novel parallel counter and a pipelined architecture. The parallel counter is based on a state look-ahead component in conjunction with an internal pipeline structure in order to simultaneously trigger all state value updates without a rippling ...

In this work, a simplified startup method for AC synchronous machines is solved by means of a simplified algorithm based only in feeding the AC synchronous machine with stator voltages with a ramp frequency. The implementation of the algorithm along with the Space Vector Pulse Width Modulation technique is carried out by means of a Field Programmable Gate Array (FPGA) device, where Very High Sp...

Part of CREATE-GV’s Mercury, the Powertrain Analysis and Computational Environment (PACE) is a simulation tool that provides advanced behavioral modeling of the powertrain subsystem of conventional or hybridelectric vehicles. PACE performs its task by converting an existing powertrain architecture created in Autonomie or Matlab/Simulink into HPC-ready C++ code using an automated code generation...

Decoder design involves choosing the optimal circuit style and figuring out their sizing, including adding buffers if necessary. The problem of sizing a simple chain of logic gates has an elegant analytical solution, though there have been no corresponding analytical results until now which include the resistive effects of the interconnect. Using simple RC models, we analyze the problem of opti...

Spray drift assessment encompasses classification of the capacity of each sprayer/ technology/setting combination to reduce or avoid the spray drift risk, as well as drift measurement to define buffer zones mandated during pesticide application. Compounding the challenge of these tasks is the great variability of field evaluation results from environmental conditions, spray application technolo...

| A new logic family, Diierential Current Switch Logic (DCSL) for implementing clocked CMOS circuits has been developed. DCSL is in principle a clocked diieren-tial cascode voltage switch logic circuit (DCVS). The circuit topology outlines a generic method for reducing internal node swings in clocked DCVS logic circuits. In comparison to other forms of clocked DCVS, DCSL achieves better perform...

Improving fabrication technology enables not only the scaling of on-chip gate speeds but also the data rate of inter-chip communication interfaces. Simple low latency offchip interfaces are limited by the maximum clock frequency that can be propagated onchip. More complex serial links break this barrier, by employing high fan-in multiplexing transmitters and high fan-out de-multiplexing receive...

A 3D computational electromagnetic-thermal coupled analysis was performed to analyze the effects of auxiliary cooling fans, called air-gap fans, on winding cooling in a large-capacity, high-speed induction motor. A novel non-uniform iron loss distribution mapping method considering time and rotation period was introduced to provide more accurate thermal modeling. Winding cooling performance in ...