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A structural study of bronze age systems of weight /Castle, Edward William. January 2000 (has links)
Thesis (Ph. D.)--University of Chicago, Dept. of Near Eastern Languages and Civilizations December 2000. / Includes bibliographical references. Also available on the Internet.
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Multi-criteria analysis and optimization of chain propagation with monomer termination polymerization in a batch reactorLandis, Craig Steven. January 1984 (has links)
Call number: LD2668 .T4 1984 L36 / Master of Science
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Valuing Breeding Traits for Appearance and Structural Timber in Radiata PineAlzamora M., Rosa Maria January 2010 (has links)
The aims of this thesis were; firstly, to obtain economic values for radiata pine traits to produce appearance and structural lumber, and secondly to analyze the selection of efficient logs and profitable trees to substantiate the development of breeding objectives for solid wood quality.
The thesis included three approaches to value wood attributes: hedonic models, partial regressions and stochastic frontiers. Hedonic models generated economic values for pruned and unpruned log traits to produce appearance grades. Values for small end diameter were 0.33, 0.19 and 0.10 US $/mm, and for form 2.6, 1.4 and 0.63 US $ for the first, second and third log respectively. The value of mean internode length was 0.19 US $/cm. Branch size traits were non-significant to explain the log conversion return (p>0.05).
The economic value of log traits to produce structural lumber with stiffness of 8, 10 and 12 GPa was estimated with a partial regression. The values were 1.1, 29.7, 0.3 and -0.4 NZ $/m3 for small end diameter (cm), stiffness (GPa), basic density (kg/m3) and largest branch (mm) respectively. Small end diameter and stiffness explained 73% of the variation of log conversion return. The economic values for structural attributes were also derived from a Cobb Douglas stochastic frontier, resulting in 2.1 NZ $/cm for small end diameter and 15.8 NZ $/GPa for stiffness. The change of values between approaches can be attributed to differences of model formulation. The stochastic frontier used aggregate volume of lumber with stiffness of 8 GPa or higher. The partial regression used the economic value of every lumber product derived from the logs, making it more sensitive to changes in wood quality.
Data envelopment analysis (DEA) used structural traits and their economic values to assess the technical and economic efficiency of logs to produce lumber with stiffness of 8, 10 and 12 GPa. The most efficient logs had 1:4 ratios between stiffness and small end diameter, whereas logs that did not generate structural lumber had ratios closer to 1:8. Trait economic values from the partial regression analysis were used as attribute prices to estimate cost efficiency. Efficiency measures were significantly correlated with stiffness and log conversion return; however, they were non-significantly correlated with small end diameter and log prices. The technical efficiency of logs to produce structural lumber was also determined using a Cobb Douglas stochastic frontier which determined that the most efficient logs were characterized by a 1:5 ratio between stiffness and small end diameter.
Selection of trees for deployment was analyzed with a portfolio model, where risk was represented as the mean absolute deviation of tree returns due to the variability of volume, stiffness and resin defects. Under high variability (risk), the model selected structural trees with large stiffness and high return. These results suggest an opportunity for narrowing genetic variability (via clonal or family forestry) to make the returns from radiata pine structural grades lumber less risky.
As variability decreased the portfolio model opted for trees that produced appearance and structural lumber. These trees had a stabilizing effect on their returns, as there were phenotypic tradeoffs between stiffness and volume under optimistic and pessimistic growing scenarios. These results showed the benefits of product diversification at the tree level.
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Serre Weights: The Partially Ramified CaseSmith, Ryan Bixby January 2012 (has links)
We study the possible weights of an irreducible 2-dimensional modular mod p representation of Gal (F/F), where F is a totally real field in which p is allowed to ramify, and the representation is tamely ramified at primes above p. We describe a set of possible weights and completely determine the weights in some cases when e = 2, f = 2.
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Hygroscopic properties of rewetted cornGarcia-Guerrero, Judith January 2011 (has links)
Typescript (photocopy). / Digitized by Kansas Correctional Industries
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The influence of cooking and bleaching upon the chain length distribution of the carbohydrate fraction in pulp woodAtchison, Joseph Edward 01 January 1942 (has links)
No description available.
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Evaluation of a new bridge formula for regulation of truck weightsContractor, Yateesh Jaykishan 01 November 2005 (has links)
The current bridge formula, Federal Bridge Formula B (BFB), established in
1974 to protect bridges against excessive overstress, is very restrictive on long
combination vehicles due to an 80,000 lb gross vehicle weight limit. Without this limit
the formula will not be able to protect bridges in the cases of longer trucks. A formula
developed by the Texas Transportation Institute (T.T.I.) called the TTI-HS20 Formula
addresses these issues. This formula, developed especially for bridges designed for the
HS-20 truck, eliminates the need for the 80,000 lb limit.
A generic formula developed to protect H15 and HS-20 bridges (James et al.,
1986) was evaluated in a previous study (James and Zhang, 1991). The approach to
evaluating the TTI-HS20 Formula follows the approach outlined in James and Zhang,
1991. Information was collected on two important elements: a set of test bridges
representative of the lightest continuous bridges, and a set of test truck configurations
representative of real truck traffic with a focus on long combination vehicles.
Critical weights of the selected trucks for the representative bridges are
calculated and plotted against the TTI-HS 20 formula and other proposed formulas. A
final recommendation as to whether this formula should be adopted nationwide is made.
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Algorithms for overdetermined systems of equationsGulliksson, Mårten January 1993 (has links)
<p>ix, [1] s., s. 1-7: sammanfattning, s. 8-142: 6 uppsatser</p> / digitalisering@umu
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The polymerization of butadiene by the syn- -crotylbis (triethylphosphite) nickel (II) hexafluorophosphate.Navarre, Alexandre January 1972 (has links)
No description available.
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A measurement of the A dependence of dimuon production from 125 GeV/c p̄ and [pi]- on Be, Cu and W /Ryan, Timothy Aidan. January 1983 (has links)
No description available.
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