114,121 research outputs found
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Calderon coal gasification Process Development Unit design and test program
No full textThe Process Development Unit (PDU) was designed and constructed to demonstrate the novel Calderon gasification/hot gas cleanup process. in the process, run-of-mine high sulfur coal is first pyrolyzed to recover a rich gas (medium Btu gas), after which the resulting char is subjected to airblown gasification to yield a lean gas (low Btu gas). The process incorporates a proprietary integrated system for the conversion of coal to gases and for the hot cleanup of the gases which removes both particulate and sulfur components of the gaseous products. The yields are: a syngas (CO and H[sub 2] mix) suitable for further conversion to liquid fuel (e.g. methanol/gasoline), and a lean gas suitable to fuel the combustion turbine of a combined cycle power generation plant with very low levels of NO[sub x] (15 ppmv). The fused slag (from the gasified char ash content) and the sulfur recovered during the hot gas cleanup will be sold as by-products. The small quantity of spent sorbent generated will be combined with the coal feed as a fluxing agent for the slag. The small quantity of wastewater from slag drainings and steam generation blowdown will be mixed with the coal feed for disposal. The Calderon gasification/hot gas cleanup, which is a completely closed system, operates at a pressure suitable for combined cycle power generation
Recommended from our members
Calderon coal gasification Process Development Unit design and test program
No full textThe Process Development Unit (PDU) was designed and constructed to demonstrate the novel Calderon gasification/hot gas cleanup process. in the process, run-of-mine high sulfur coal is first pyrolyzed to recover a rich gas (medium Btu gas), after which the resulting char is subjected to airblown gasification to yield a lean gas (low Btu gas). The process incorporates a proprietary integrated system for the conversion of coal to gases and for the hot cleanup of the gases which removes both particulate and sulfur components of the gaseous products. The yields are: a syngas (CO and H{sub 2} mix) suitable for further conversion to liquid fuel (e.g. methanol/gasoline), and a lean gas suitable to fuel the combustion turbine of a combined cycle power generation plant with very low levels of NO{sub x} (15 ppmv). The fused slag (from the gasified char ash content) and the sulfur recovered during the hot gas cleanup will be sold as by-products. The small quantity of spent sorbent generated will be combined with the coal feed as a fluxing agent for the slag. The small quantity of wastewater from slag drainings and steam generation blowdown will be mixed with the coal feed for disposal. The Calderon gasification/hot gas cleanup, which is a completely closed system, operates at a pressure suitable for combined cycle power generation
Calderon Luis, Calle Arturo, Dorselear Jaime — Problemas de urbanizacion en America latina
No full textH. J. Calderon Luis, Calle Arturo, Dorselear Jaime — Problemas de urbanizacion en America latina. In: Population, 20ᵉ année, n°4, 1965. pp. 715-716
A Multiplicative Calderon Preconditioner for the Electric Field Integral Equation
No full textIn this paper, a new technique for preconditioning electric field integral equations (EFIEs) by leveraeine Calderon identities is presented. In contrast to all previous Calderon preconditioners, the proposed preconditioner is purely multiplicative in nature, applicable to open and closed structures, straightforward to implement, and easily interfaced with existing method of moments (MoM) code. Numerical results demonstrate that the MoM EFIE system obtained using the proposed preconditioning converges rapidly, independently of the discretization density
Glenn H. Parkin, Saving the legacy: an oral history of Utah\u27s World War II veterans, ACCN 2070, American West Center, University of Utah
No full textTranscript (30 pages) of an interview by Joel C. Calderon with Glenn H. Parkin on September 17, 2001. This is from tape number 315 in the "Saving the Legacy Oral History ProjectParkin (b. 1922) recalls his childhood in North Salt Lake. He entered the U.S. Navy in February 1941 and was assigned to the Northampton, which was sunk at Guadalcanal. He later served on the Hoel. Parkin recalls experiences in the Marshall and Gilbert Islands, Bougainville, Wake, Marcus, Midway, Tassafaronga, Palau, and the Battle of Leyte Gulf. He appeared on the History Channel\u27s . 30 pages
Central suboptimal H∞ control design for nonlinear polynomial systems
No full textThis article presents the central finite-dimensional H∞ regulator for nonlinear polynomial systems, which is suboptimal for a given threshold γ with respect to a modified Bolza-Meyer quadratic criterion including the attenuation control term with the opposite sign. In contrast to the previously obtained results, the article reduces the original H∞ control problem to the corresponding optimal H2 control problem, using this technique proposed in Doyle et al. [Doyle, J.C., Glover, K., Khargonekar, P.P., and Francis, B.A. (1989), 'State-space Solutions to Standard H2 and H∞ Control Problems', IEEE Transactions on Automatic Control, 34, 831-847]. This article yields the central suboptimal H∞ regulator for nonlinear polynomial systems in a closed finite-dimensional form, based on the optimal H2 regulator obtained in Basin and Calderon-Alvarez [Basin, M.V., and Calderon-Alvarez, D. (2008b), 'Optimal Controller for Uncertain Stochastic Polynomial Systems', Journal of the Franklin Institute, 345, 293-302]. Numerical simulations are conducted to verify performance of the designed central suboptimal regulator for nonlinear polynomial systems against the central suboptimal H∞ regulator available for the corresponding linearised system
A proof of the Calderon extension theorem
No full textIn this note we outline a proof of the Calderon extension theorem by a technique similar to that for the Whitney extension theorem. For classical proofs, see Calderon [2] and Morrey [4]. See also Palais [6, p. 170]. Our purpose is thus to give am ore unified proof of the theorem in the various cases. In addition, the proof applies to the Holder space C^(k+a), which was used in [3], and applied to regions satisfying the "cone condition" of Calderon. Let M be a compact C^∞ manifold with C^∞ boundary embedded as an open submanifold of a compact manifold M. Let π:E→M be a vector bundle and let L:^p_k(π), L:^p_k(π ׀ M) be the usual Sobolev spaces and H^k=L:^2_k. See [2], [5],or [6] for the definitions. Here, denotes restriction. We prove the following for H^8 (s≥O an integer), but a similar proof also holds for L≥p_k:, and C^(k+a), 0≤1X≤1
Central suboptimal H-Infinity control design for nonlinear polynomial systems
No full textThis paper presents the central finite-dimensional H∞ regulator for nonlinear polynomial systems, that is suboptimal for a given threshold g with respect to a modified Bolza- Meyer quadratic criterion including the attenuation control term with the opposite sign. In contrast to the previously obtained results, the paper reduces the original H∞ control problem to the corresponding optimal H2 control problem, using the technique proposed in [1]. The paper yields the central suboptimal H∞ regulator for nonlinear polynomial systems in a closed finite-dimensional form, based on the optimal H2 regulator obtained in [2]. Numerical simulations are conducted to verify performance of the designed central suboptimal regulator for nonlinear polynomial systems against the central suboptimal H∞ regulator available for the corresponding linearized system.Michael Basin, Peng Shi Dario, Calderon-Alvarezhttp://www.a2c2.org/conferences/acc2009
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
An hybrid Calderon-hierarchical preconditioner for the EFIE analysis of radiation and scattering from PEC bodies
No full textA new approach to discretize the electric field integral equation (EFIE) that hybridizes Calderon and hierarchical techniques is presented. The benefits of these two techniques are combined and inherited by the proposed method. The result is an EFIE solver which is immune from low-frequency breakdown, well-conditioned in the presence of densely discretized structures and exhibits only minimal computational overhead. The hybridization is achieved by observing that hierarchical techniques link the conditioning of the global EFIE problem to that of a reduced size problem that can be successfully regularized by a properly tailored Calderon approach. Numerical results will show the performance of the proposed method and its advantages over to the state of the art
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