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Showing 1 to 20 of 63 for “"Direct methods"”.
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Orderings and direct methods for coarse granular parallel solutions in equation-based flowsheeting
… processor load distribution. Previously proposed methods for identifying coarse task granularity in the solution of linear equations for equation-based (EB) flowsheeting have attempted to exploit the natural block structure of these matrices; however, those methods made no attempt to reduce …
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Assessment of direct methods in power system transient stability analysis for on-line applications
… and control to be considered. The use of direct methods for these on-line applications is assessed. The classical representation of a power system allows the use of two reference frames: Center of angle and one machine as reference. Formulae allowing transition between the two reference …
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Studying the Impact of Solar Photovoltaic on Transient Stability of Power Systems using Direct Methods
… stability of the grid. On the other hand, the direct methods for transient stability assessment of power systems have also fairly evolved over the past 30 years. These set of techniques inspired from the Lyapunov's direct method provide a clear insight into the system stability changes with a …
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Molecular studies of natural products and related compounds.
… described in this thesis involves the use of direct methods of X-ray structure analysis for the structure elucidation of novel natural products and related compounds. Empirical force field calculations are also used for conformational and biosynthetic studies. An outline of the development of …
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On the direct solution of the poisson equation
The dissertation investigates direct methods for solving the discrete Poisson equation. In particular it gives a detailed account of the methods of Hockney and Buneman.
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A Practical Method for Power Systems Transient Stability and Security
<p>Stability analysis methods may be categorized by two major stability analysis methods: small-signal stability and transient stability analyses. Transient stability methods are further categorized into two major categories: numerical methods based on numerical integration, and direct methods. The …
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Kristallstrukturuntersuchungen von Hauptgruppen-Nitriden mittels Pulverbeugung
… imides were investigated by powder diffraction methods. The crystal structures of a series of nitridophosphates and nitridocarbonates which were available only as powder were solved by direct methods after indexing and extraction of the integrated intensities. By neutron powder diffraction on …
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The Sherman Morrison Iteration
… Morrison iteration is compared to classic direct methods, as well as iterative methods, in a number of experiments. Specific Matlab implementation of the Sherman Morrison iteration is discussed, with Matlab codes for the method available in the appendix.
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A THEMATIC ANALYSIS OF EXPERIENCES OF NON-NATIVE ENGLISH SPEAKING INTERNATIONAL GRADUATE STUDENTS WITH THE INTERNET-BASED TEST OF ENGLISH AS A FOREIGN LANGUAGE
… TOEFL. This research suggests that direct methods of eliciting opinions and experiences may be essential as participants described experiencing problems which they do not report to the ETS.
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Quantification of biomass in a biooxidation system
… study was to investigate and compare various methods to enumerate the number of bacteria in a minerals biooxidation system. In this system most of the bacteria are attached to fine particles of ore and therefore cannot be enumerated by direct cell counting. This has hindered attempts to …
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Quantification of biomass in a biooxidation system
… study was to investigate and compare various methods to enumerate the number of bacteria in a minerals biooxidation system. In this system most of the bacteria are attached to fine particles of ore and therefore cannot be enumerated by direct cell counting. This has hindered attempts to …
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Morals Education in the Public Schools
… a normal classroom setting and if teachers use a direct or indirect method of instruction for the teaching of values. The study included 70 teachers from grades kindergarten through sixth grade; special education teachers were included. The data were compiled from results of a questionnaire. …
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Peer Ethnic Socialization: Prevalence, Predictors, and Outcomes Among African-American Adolescents
… adolescents reported their peers used indirect as opposed to direct methods of socialization more frequently. Results indicated that higher age and peer orientation predicted higher peer ethnic socialization. Additionally, higher peer ethnic socialization predicted lower self-esteem, …
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Mixed-Field Finite-Element Computations
A new method called the Direct Method is developed to solve for the propagating modes in waveguides via the finite-element method. The variational form of the Direct method is derived to ensure that an extremum is reached. The Direct method uses Maxwell's equations directly, both zero and …
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The determination of the crystal structure of four compounds of industrial importance
… crystal structures. One was solved by the MULTAN direct methods computer program, two by the use of the NRC direct methods program using 12 relationships, and one by "trial-and-error" because none of the other methods produced any meaningful results. Refinement of all four structures was carried …
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A Validation Study of a Writing Skills Test for Police Recruit Applicants
This study evaluated the effectiveness of a direct test of higher-order and lower-order writing abilities needed for police report writing. This test was specifically designed to address report writing deficiencies experienced by police in the training academy. Descriptive statistics were examined, …
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Estruturas de solos: métodos de observação
… first part a literature review on the existing methods for the observation of soil fabric is made. This part is itself sub-divided in two other parts: - indirect methods, - direct methods. In the indirect methods, the use of the principal properties of soil, such as permeability, shear strenght, …
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Large Scale Simulations of Brownian Suspensions
… whereby near-field interactions are evaluated directly and far-field interactions are evaluated using a grid based velocity computed with FFT's. This approach is readily extended to include the effects of Brownian motion. For interacting particles, the fluctuation-dissipation theorem requires …
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Semilinear elliptic partial differential equations with the critical Sobolev exponent
We present how variational methods and results from linear and non-linear functional analysis are applied to solving certain types of semilinear elliptic partial differential equations (PDEs). The ultimate goal is to prove results on the existence and non-existence of solutions to the Semilinear …
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Continuous-time multivariable system identification
… of continuous-time multivariable systems. Direct methods of identification, i.e. identifying a continuous-time model directly from samples of input-output data, are considered briefly. Of primary consideration is the indirect method of identification, which can be considered as a two stage …
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