Stable operation of both axial and radial compressors is constrained by the occurence of aerodynamic flow instabilities: rotating stall and surge. Developments in the understanding of the physics behind these instabilities and ideas of how t o stabilize the compressor system, have opened the door t o a new era in the field of compressor control. This study gives an overview of the current state...

This paper presents small world in motion (SWIM), a new mobility model for ad-hoc networking. SWIM is relatively simple, is easily tuned by setting just a few parameters, and generates traces that look real—synthetic traces have the same statistical properties of real traces. SWIM shows experimentally and theoretically the presence of the power law and exponential decay dichotomy of inter-conta...

Learning Analytics is about collecting traces that learners leave behind and using those traces to improve learning. Dashboard applications can visualize these traces to present learners and teachers with useful information. The work in this paper is based on traces from an inquiry-based learning (IBL) environment, where learners create hypotheses, discuss findings and collect data in the field...

Characterizing the communication behavior of larges cale ap p lications is a d iffi cult and cos tly tas k d ue to cod e/s y s tem comp lex ity and their long ex ecution times . A n alternative to running actual cod es is to gather their communication traces and then rep lay them, w hich facilitates ap p lication tuning and future p rocurements . W hile p as t ap p roaches lack ed los s les s s...

Abstract We review the use of young low mass stars and protostars, or stellar objects (YSOs), as tracers star formation. Observations molecular clouds at visible, infrared, radio X-ray wavelengths can identify characterize YSOs populating these clouds, with ability to detect deeply embedded all evolutionary stages. Surveys Spitzer, Herschel, XMM-Newton Chandra space telescopes have measured spa...

The present paper focuses on the two time scale dynamics generated by 2D polynomial noninvertible maps T of (Z0−Z2) and (Z1−Z3−Z1) types. This symbolism, specific to noninvertible maps, means that the phase plane is partitioned into zones Zk, where each point possesses the k real rank-one preimages. Of special interest here is the structure of slow and fast motion sets of such maps. The formati...

In order to robustly execute a task under environmental uncertainty, a robot needs to be able to reactively adapt to changes arising in its environment. The environment changes are usually reflected in deviation in sensory traces from nominal. These deviations in sensory traces can be used to drive the plan adaptation, and for this purpose, a feedback model is required. The feedback model maps ...