Control moment gyroscope (CMG) is widely used as an actuator of spacecraft attitude control Micro-vibrations generated by CMG will influence the performance of high-sensitivity instruments on-board the spacecraft; however, the micro-vibrations characteristics of CMG are not yet clearly understood. This paper concentrates on testing and analyzing the micro-vibrations produced by CMG. Firstly, fo...

Control moment gyros (CMGs) are spacecraft attitude control actuators which act as torque amplifiers. They are thus suitable for attitude hold and reorientation of large spacecraft or for slew maneuvering. They provide the necessary torques via gimballing a spinning flywheel. A major problem encountered with the use of CMGs in practice is the possibility of singularities for certain combination...

of Dissertation Presented to the Graduate School of the University of Florida in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy NONLINEAR CONTROL FOR SYSTEMS CONTAINING INPUT UNCERTAINTY VIA A LYAPUNOV-BASED APPROACH By William MacKunis May 2009 Chair: Dr. Warren E. Dixon Major: Aerospace Engineering Controllers are often designed based on the assumption that a c...

In an asylum seeker centre in Schleswig-Holstein, a resident was diagnosed with furuncle caused by a Panton-Valentine leukocidine (PVL)-positive community-acquired meticillin-resistant Staphylococcus aureus (CA-MRSA). As a result of active case finding, 232 of 427 persons (54% of all residents) were screened for MRSA and two further PVL-positive CA-MRSA cases were identified

The seeker of ultimate truth needs the understanding of the practical side of Vedanta philosophy, the five Koshas or Sheaths beyond which the Atman, the Self remains. Through Vedanta and Yoga one can transcend these layers in a systematic manner to attain self realization - ultimate Reality.

Work is a fundamental determinant of how Americans feel about the quality of their life. In the past 15 years, employment has gained a central role in the lives of women as well as men, with married women and single mothers greatly increasing their participation in the workforce (Nieva, 1988). As economic changes trigger workplace shutdowns and reductions in the workforce, an estimated 10 milli...

voltage stability issues are growing challenges in many modern power systems. this paper proposes optimizing the size and location of static var compensator (svc) devices using a fuzzy weighted seeker optimization algorithm (fwsoa), as an effective solution to overcome such issues. although the primary purpose of svc is bus voltage regulation, it can also be useful for voltage stability enhance...

information retrieval, MEERCAT, browsing, search, asset management Information retrieval systems offer two main methods to access information: searching by submitting a query and browsing a constructed navigation hierarchy. In most systems, these two methods are accessed and operated by the information seeker in different ways and generate different types of result sets that allow different kin...