Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 82 for “"Negative values."”.
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A logic for feature structures and unification with disjunctive and negative values
This dissertation proposes a unification-based formalism to provide a common basis for a computational realization of different linguistic theories, GPSG, HPSG, and LFG in particular, both as a means of theory testing and for the purpose of developing natural language processing systems. A logical …
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A Composite-Upper Bounding Method of Finding a Feasible Solution to a Linear Programming Problem
… composite, refers to a technique for handling negative values of variables in a linear programming problem. It is often desirable to let variables have (temporary) negative values rather than perhaps multiplying by -1 and adding artificial variables. This happens, for instance, when an optimal …
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Nonnegative Polynomials, Sums of Squares and the Cayley-Bacharach Theorem
… to prove that a polynomial only takes non-negative values. One way to certify that a polynomial is non-negative is to express it as a sum of squares, however not all non-negative polynomials can be written as a sum of squares. The fundamental reason that there exist non-negative polynomials …
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Sequentially-fit alternating least squares algorithms in nonnegative matrix factorization
Nonnegative matrix factorization (NMF) and nonnegative least squares regression (NNLS regression) are widely used in the physical sciences; this thesis explores the often-overlooked origins of NMF in the psychometrics literature. Another method originating in psychometrics is sequentially-fit …
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Contrasting directed forgetting and value directed memory
… pairings were assigned positive, zero, and negative values, and memory was assessed with associative recognition. In Experiment 1, the encoding strategy was controlled, whereas in Experiment 2, it was left open to participants. There was no effect of value manipulation on associative …
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Dimethyl N-Aryl phosphoramidates : structural effects on bonding and solvolytic reactivity
… These rates have been correlated with the pKa values of the corresponding ani I inium iOhs and the slope of this reactivitybasicity relationship for phosphoramidate with ortho substituents (6 = 0~85) is found to differ from that for substrates with meta and para substituents (S = 0,36). …
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On Enforcing Maximum Principles and Element-Wise Species Balance for Advective-Diffusive-Reactive Systems
… the absolute temperature naturally attain non-negative values. Moreover, the governing equations of an advective-diffusive-reactive system are either elliptic (in the case of steady-state response) or parabolic (in the case of transient response) partial differential equations, which possess …
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Non-perturbative determination of Karsch Coefficients in 2 Colour QCD
… coefficients perturbatively however this led to negative values for pressure. Non-perturbative studies have proved difficult due to the computational cost and accuracy required. We attempt to determine these coefficients non-perturbatively and review possible improvements in setup and …
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Hydrodynamic Instability of Fluid Flow Through Homogeneous Porous Media
… to be spatially unstable for relatively small negative values of the porosity derivative, thus providing a new potential mechanism for observed instabilities.
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Investigation of lattice mismatch in rhenium containing nickel-base superalloys
… The dislocation analysis technique gave larger negative values of mismatch. It is believed that these latter values represent those which exist at the aging temperature (1079°C). No effect of Re on lattice mismatch was observed, possibly due to the fact that the lower Re alloy contained more W.
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Huffing and puffing about /f/-ing everything: language ideologies and phonological borrowing in South Korea
… for a long time it has also been linked with negative values, such as immodesty, pretentiousness, and being a traitor to the nation (Park J. 2009). While the traditional linguistic ideologies are still very much alive and in circulation, I argue that recently a new language ideology has been …
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Anomalous photon phenomena in electromagnetic crystal systems
… range that appeared to exhibit simultaneously negative values of permittivity and permeability. Such substances were known as "left-handed materials," and had been predicted to enable a variety of anomalous electromagnetic effects. Intense interests have developed in these materials after …
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Estimation of Shadow-Rate Term Structure Models Near the Zero-Lower Bound
… zero: Gaussian models can have arbitrarily large negative rates, whereas arbitrage considerations dictate that rates should remain positive (or very slightly negative at most). Black (1995) suggests that interest rates include an optionality which restricts them to non-negative values. This …
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A continuous system of community facilities for the redevelopment of blighted areas in the city
… to have positive as well as the more evident negative values. An analysis of areas which have maintained continuous redevelopment reveals that diverse activities and foci have developed. Life as opposed to dullness is evident. Society, the political structure, economics and physical form are …
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Shear and normal stresses in uniaxial compaction.
… cross the mean compaction stress axis to give negative values of shear stress and reach a minimum value of T min' which was material and compaction p.,- essure dependent. The unloading curves of non-compactable materials gaye approximately zero shear. The parameters evaluated from the …
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Role of surface chemistry in sub-Einstein rheology of nano-composites
Sub-Einstein and negative intrinsic viscosities resulting from the addition of nano-fillers to polymer melts approximately 2-10 nm diameter have been reported. Here we explore the intrinsic viscosity of polyhedral oligomeric silisequioxane (POSS) particles of approximately 1.6-2.5 nm diameters as a …
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A Comparison of Four Methods to Estimate Groundwater Recharge for Northeastern South Dakota
… formula and Meyboom method did not allow negative values; therefore, there were not a good fit compared with the well level data method.</p>
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The aggregation of clay minerals and marine microalgal cells : physicochemical theory and implications for controlling harmful algal blooms
… over the interval when clays were < 50 μm, these values correlated well with the empirical RB's for the flagellated species (R2 = 0.90). These results suggested that collisions due to cell motility may be important during the early stages of aggregation when clay sizes are relatively small (i.e. …
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Investigation into the use of a tapered element oscillating microbalance for real-time particulate measurement
… mass rate data were separated into positive and negative values, then integrated over the duration of the test. The integrated positive mass was divided by the integrated negative mass to create a positive-to-negative mass ratio. This ratio was indicative of real PM collected versus moisture …
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Trace Greenhouse Gas Fluxes in Upland Forests
… tree-mediated CH₄ fluxes declined from positive values (emission) at the stem base to negative values (uptake) higher up. Stem CH₄ fluxes generally increased significantly with solar radiation, suggesting a link to photosynthetic activity mediated by tree water transport. Collectively, these …
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