The great number of different local environments in amorphous alloys leads to the evolution of complicated non collinear magnetic structures. Alloy additions can affect the magnetic structure in surprising ways. For e...
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The great number of different local environments in amorphous alloys leads to the evolution of complicated non collinear magnetic structures. Alloy additions can affect the magnetic structure in surprising ways. For example, replacement of a small amount of Fe with Co increases the saturation magnetization even though Co has a much smaller moment than Fe. The calculated behavior of the magnetic structure of (Fe(1-x)Mx)0.8B0.2 with M=Co, Cr, Zr, and Mn2Zr are presented.
Consider the robust Duncan-Mortensen-Zakai (DMZ) equation arising from Yau filtering system which includes Kalman-Bucy filtering system and Benes filtering. The main problem of nonlinear filtering is to solve this rob...
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Consider the robust Duncan-Mortensen-Zakai (DMZ) equation arising from Yau filtering system which includes Kalman-Bucy filtering system and Benes filtering. The main problem of nonlinear filtering is to solve this robust DMZ equation in real time. It is shown that this equation can be solved explicitly with an arbitrary initial condition by solving a linear system of ODEs and a Kolmogorov-type equation. Furthermore, it is shown that the Kolmogorov-type equation can be solved via the Riccati-type system of ODEs. Thus the robust DMZ equation arising from Yau's filtering system is shown to be solvable in real time.
This paper investigates time-invariant linear systems subject to input and state constraints. It is shown that the recoverable region (which is the largest domain of attraction that is theoretically achievable) can be...
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This paper investigates time-invariant linear systems subject to input and state constraints. It is shown that the recoverable region (which is the largest domain of attraction that is theoretically achievable) can be semi-globally stabilized by continuous nonlinear feedbacks while satisfying the constraints. Moreover, a reduction technique is presented which shows, when trying to compute the recoverable region, that we only need to compute the recoverable region for a system of lower dimension, which generally leads to a considerable simplification in the computational effort.
Sensor and network topologies of formations of autonomous agents are considered. The aim of the paper is to suggest an approach for such topologies for formations with direction, bearing and angle information between ...
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Sensor and network topologies of formations of autonomous agents are considered. The aim of the paper is to suggest an approach for such topologies for formations with direction, bearing and angle information between agents in the plane and in 3-space. A number of results are translated from prior work in this field and in the study of constraints in CAD programming, in rigidity theory, in structural engineering and in discrete math.matics. Some new results are presented both for the plane and for 3-space. A number of unsolved problems are also mentioned.
We applied the locally self-consistent multiple scattering (LSMS) method to the study Fe-based bulk amorphous metals. The LSMS method is an order-N approach to the electronic structure calculation for solid state mate...
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We applied the locally self-consistent multiple scattering (LSMS) method to the study Fe-based bulk amorphous metals. The LSMS method is an order-N approach to the electronic structure calculation for solid state materials based on density functional theory and local density approximation. Using LSMS method, we performed electronic structure calculations for the supercell samples generated by ab-initio molecular dynamics simulation. The equilibrium atomic volume and the bulk modulus are calculated based on the energy versus volume curve. The magnetic moment distribution in the samples is determined for both collinear and noncollinear cases. A comparison with the experimental results is also made.
A strategy for maintaining separation distances between several satellites in a coplanar elliptical orbiting constellation is developed. A possible scientific application of such a system would be in measuring the cur...
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A strategy for maintaining separation distances between several satellites in a coplanar elliptical orbiting constellation is developed. A possible scientific application of such a system would be in measuring the curl of the Earth's magnetic field by taking simultaneous measurements along the elliptical orbit. The strategy involves maneuvers which would cause small shifts in the direction of the four semimajor axes. With this approach for Keplerian type orbits, the separation distance between adjacent satellites remains within a few percent of the nominal separation distance. This paper emphasizes problems of implementation: 1. Initial deployment. It is assumed that the satellites are launched by a single vehicle. The method to distribute the satellites into their positions using the least maneuver energy is studied. 2. Maintenance of the separation distance. Since the math.matical model is nonlinear and time-variant, a nonlinear control law based on a Lyapunov function is applied to the osculating orbital elements of the daughter satellites. The simulation results with this control show that with perturbations (mainly caused by J2), the response to initial errors converges smoothly and the control energy spent is at a very low level.
We revisit the two standard dense methods for matrix Sylvester and Lyapunov equations: The Bartels-Stewart method for A1X+XA2+D=0 and Hammarling's method for AX+XAT+BBT=0 with A stable. We construct three schemes ...
This project used Eberhardt's team functions as an observational protocol to examine the team process as it occurred in the Engineering Practices Introductory Course Sequence (EPICS) at the Colorado School of Mine...
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This project used Eberhardt's team functions as an observational protocol to examine the team process as it occurred in the Engineering Practices Introductory Course Sequence (EPICS) at the Colorado School of Mines. A design report scoring rubric was used to evaluate the quality of the team-produced final report. The results of this study suggest that the gender composition of the teams impacted both the interactions that took place during the team process and the quality of the team's final report. Members of majority male teams were more likely to be witnessed clarifying and standard setting during team interactions than were members of majority female teams. During the first course, the final reports that were produced by majority male teams on average were judged to be of higher quality than were those that were produced by majority female teams. The reverse was found to be true in the second course.
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