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The economics of open-pit slope angle variationSchottler, George Richard, 1934- January 1962 (has links)
No description available.
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Stochastic optimization approaches to open pit mine planning : applications for and the value of stochastic approachesNascimento Leite, Andre. January 2008 (has links)
The mine production schedule defines the sequence of extraction of selected mine units over the life of the mine, and consequentially establishes the ore supply and total material movement. This sequence should be optimized so as to maximize the overall discounted value of the project. Conventional schedule approaches are unable to incorporate grade uncertainty into the scheduling problem formulation and may lead to serious deviations from forecasted production targets. Stochastic mine production schedulers are considered to obtain more robust mine production schedule solutions. / The application of stochastic approaches to the mine production schedule problem is recent and additional testing is required to better understand these tools and to define the value of a stochastic solution as compared to the conventional result. Two stochastic schedulers are tested in a low-grade variability copper deposit, optimization parameters are discussed and their results compared with a conventional schedule. / The first method uses a stochastic combinatorial optimization approach based on simulated annealing to address the mine production schedule problem. The method aims for maximization of the net present value (NPV) of the project and minimization of deviations from the production targets. These objectives are attained by incorporating grade uncertainty into the mine production schedule problem formulation. The second method formulates the problem as a stochastic integer programming problem, in which the objective is the maximization of the projects' NPV and the minimization of production targets deviations. The model can also manage how the risk of deviating from the targets is distributed between production periods. / Both stochastic approaches were tested in a low-grade variability copper deposit. In both case studies, the value of a stochastic solution is demonstrated to be higher than the conventional one. This fact demonstrated the misleading results that a conventional schedule may produce and shows the importance of not ignoring the presence of uncertainty when defining the mine production schedule for a project.
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Open pit mining in urban areasSanders, Billy Gordon 05 1900 (has links)
No description available.
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On the analysis of multiple site damage in stiffened panelsCollins, Richard Anthony January 1999 (has links)
No description available.
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Analysis and modeling of discontinuities and inter-element coupling in passive microwave integrated circuit componentsThorburn, Michael Arthur 02 April 1991 (has links)
Accurate, efficient and general computational
techniques are developed to evaluate the scattering
parameters of passive microstrip components composed of
discontinuities in microstrip transmission lines on
general two layer substrates with single and two level
metallization. An open domain model is used. The
Electric Field Integral Equation is examined and the
Green's function for single and double layer dielectric
substrates on a infinite ground plane are reviewed while
emphasizing the important computational details to the
model, including singularity of the kernel, evaluation of
the Sommerfeld Integrals, and interpolation of the Green's
functions. In order to model accurately complex circuit
geometries, two dimensional currents are used. Different
basis functions for expansion and for testing are chosen
in order to make the computation more efficient and allow
for structures having general shape in the moment method
formulation. A transmission line current source is used
to model the parameters are flowing in and circuit evaluated
out of structure. Structures excitation and the scattering
by calculating the currents each of the N-ports of the
such as microstrip bends, microstrip crossovers of arbitrary angle, and coupled
microstrip discontinuities are analyzed. To validate the
model, results of some elementary structures are compared
with published results of other models. / Graduation date: 1992
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A hydrogeologic study of an unstable open-pit slope, Miami, Gila County, ArizonaEarl, Thomas Alexander, January 1973 (has links) (PDF)
Thesis (Ph. D. - Geosciences)--University of Arizona. / Part of folded illustrative matter in pocket. Includes bibliographical references.
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Linear and geometrically non linear analysis of flat-walled stru ctures by the finite strip method /Delcourt-Bon, Claudine Renee Christine. January 1978 (has links) (PDF)
Thesis (Ph.D.) from the Dept. of Civil Engineering, University of Adelaide, 1979. / Typescript (photocopy).
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The development and application of the finite element method and finite strip method in engineering analysis /Cheung, Yau Kai. January 1978 (has links) (PDF)
Thesis (D.E.) - Dept. of Electrical Engineering, University of Adelaide.
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The influence of rock mass and intact rock properties on the design of surface mines with particular reference to the excavatability of rock /Kramadibrata, Suseno. January 1996 (has links)
Thesis (Ph.D.)--Curtin University of Technology. / Includes bibliographical references. Also available as an electronic version via the Internet.
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Electric probe measurements on microstrip circuitsDahele, Jashwant Singh, January 1979 (has links)
Thesis, Ph.D., University of Hong Kong, 1979. / Also available in print.
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