64,424 research outputs found
Clarence D. Rogers, Utah Uranium Oral History Project
No full textTranscript (82 pages) of an interview by Suzanne Simon and Dorothy Erick with Clarence Rogers, on July 27, 1970. From tape number UR-148 in the Utah Uranium Oral History ProjectRogers (b. 1906) was interviewed by Suzanne Simon and Dorothy Erick in Blanding, Utah. Subjects: the Poke and Posey War of 1915, colonization of Blanding, "the ditch," homesteading, stock raising, catching Mavericks, branding, modern-day ranching, state and federal grazing policies, the "red calf" incident, John Rogers and sheep raising, prospecting and staking claims, outsiders, geologists, surveyors, placer mining on the Colorado, Lake Powell, the discovery of Rainbow Bridge, Zane Grey, Professor Gregory, Hovenweep, Zeke Johnson, massacre near White Canyon, death of Posey, Clarence D. Rogers (82 pages)
Branchinecta uruguayensis Rogers & Racz Lorenz, 2015 is a junior synonym of B. achalensis César, 1985 (Branchiopoda: Anostraca: Branchinectidae)
No full textCohen, Rosa Graciela, Rogers, D. Christopher (2018): Branchinecta uruguayensis Rogers & Racz Lorenz, 2015 is a junior synonym of B. achalensis César, 1985 (Branchiopoda: Anostraca: Branchinectidae). Zootaxa 4531 (1): 139-141, DOI: 10.11646/zootaxa.4531.1.
Output Feedback Control of Discrete Linear Repetitive Processes
No full textRepetitive processes are a distinct class of 2D systems (i.e. information propagation in two independent directions) of both systems theoretic and applications interest. They cannot be controlled by direct extension of existing techniques from either standard (termed 1D here) or 2D systems theory. Here we give new results on the relatively open problem of the design of physically based control laws using an LMI setting. These results are for the sub-class of so-called discrete linear repetitive processes which arise in applications areas such as iterative learning control
Smoothed Particle Hydrodynamics: Approximate zero-consistent 2-D boundary conditions and still shallow-water tests
No full textsmoothed particle hydrodynamics; boundary conditions; shallow water equations; source terms; virtual boundary particles; still waterIn this paper, an approximate modified virtual boundary particle method (MVBP) for solid boundary conditions in a two-dimensional (2-D) smoothed particle hydrodynamics (SPH) model is presented; this is a development of the original VBP method recently proposed by Ferrari et al. (Comput. Fluids 2009; 38(6): 1203-1217). The aim is to maintain the zeroth moment of the kernel function as closely as possible to unity, a property referred to as zero-consistency, for particles close to solid boundaries. The performance of the new method in approximating zero-consistency in the presence of complicated boundaries is demonstrated where we show that the MVBP method improves the accuracy of the zeroth moment by almost an order of magnitude. Shallow-water flows are an important two-dimensional (2-D) application and provide the simple test case of still water. The shallow-water equations (SWEs) are thus considered in SPH form and the zero-consistency approximation is tested for still water in domains with different boundaries: a circle and two squares, one with an additional internal angle of 300 ring operator and one with four internal angles of 345 ring operator. We demonstrate that for an internal angle of 300 ring operator, the MVBP method demonstrates numerical convergence to still-water conditions whereas both mirror particles and the VBP method cannot. The method is also demonstrated for the dynamic case of a circular dam break interacting with an outer circular wall where conventional mirror particles fail to prevent particles passing through the solid wall. The SPH SWEs are further generalized through a new method for discretizing the bed source term allowing arbitrarily complicated bathymetries. The resulting formulation is tested by considering many different bed shapes in still water: submerged and surface-piercing humps, a submerged step, a submerged and surface-piercing parabolic bed. ?? 2011 John Wiley & Sons, Ltd
Letter from S. B. Simmons to I. C. Rogers
No full textLetter from S. B. Simmons to I. C. Rogers, concerning previous letter to E. D. Johnson
Control and Filtering for Discrete Linear Repetitive Processes with H infty and ell 2--ell infty Performance
No full textRepetitive processes are characterized by a series of sweeps, termed passes, through a set of dynamics defined over a finite duration known as the pass length. On each pass an output, termed the pass profile, is produced which acts as a forcing function on, and hence contributes to, the dynamics of the next pass profile. This can lead to oscillations which increase in amplitude in the pass to pass direction and cannot be controlled by standard control laws. Here we give new results on the design of physically based control laws for the sub-class of so-called discrete linear repetitive processes which arise in applications areas such as iterative learning control. The main contribution is to show how control law design can be undertaken within the framework of a general robust filtering problem with guaranteed levels of performance. In particular, we develop algorithms for the design of an H? and dynamic output feedback controller and filter which guarantees that the resulting controlled (filtering error) process, respectively, is stable along the pass and has prescribed disturbance attenuation performance as measured by and – norms
Sums of Series of Rogers Dilogarithm Functions
No full textSome sums of series of Rogers dilogarithm functions are established
by Abel’s functional equation
Barbara Rogers Memoir Collection, Undated
No full textPhotograph of male and female standing next to each other. Text reads, 'Laura D. Rather 17 years old, Dan Rather her brother 26 years old - Grandfather of Dan Rather C. B. S. News.
Control and Disturbance Rejection for Discrete Linear Repetitive Processes
No full textRepetitive processes are a distinct class of 2D systems (i.e. information propagation in two independent directions) of both systems theoretic and applications interest. They cannot be controlled by direct extension of existing techniques from either standard (termed 1D here) or 2D systems theory. Here we give new results on the relatively open problem of the design of physically based feedforward/feedback control laws to achieve desired performance and disturbance decoupling in the sense defined in the body of the paper
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