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 164 for “"specific gravity"”.
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The mean specific gravity of the earth
Thesis: B.S., Massachusetts Institute of Technology, Department of Physics, 1876
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Evaluation of methods for measuring aggregate specific gravity
… procedures for determining the aggregate specific gravities and absorption values are time consuming and hence are not appropriate for quality control processes. These methods are not repeatable too which is another issue with the standard test methods. The standard AASHTO method for fine …
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Evaluation of methods for determining bulk specific gravity of Hma specimens
… comparisons were made on the methods for bulk specific gravity measurements of rutted and unrutted Hot Mix Asphalt (HMA). Bulk specific gravity determination was performed using three methods: Water Displacement(TM), Parafilm(TM) and Corelok(TM). The evaluations were made on a total of …
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Comparison of methods for determining bulk specific gravity of Hma specimens
In this study, bulk specific gravity measurements of coarse graded Hot Mix Asphalt were conducted using two methods, Parafilm(TM) and Corelok(TM). The measurements were compared for similarity and repeatability of results. The comparisons were made on two sets of specimens, unrutted and rutted …
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Gene expression profiling in Saccharomyces cerevisiae grown at different specific gravity environments
… of G3P shuttle indicated that under very high gravity environment, sufficient assimilatory nitrogen enhances yeast’s ability of redox balancing, and therefore higher stress-tolerance and higher fermentation efficiency of yeast. Under contrast W270/Q270, the up-regulation of DUR1,2 responsible …
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Relationship between Tooth Withdrawal Strength and Specific Gravity for Metal Plate Truss Connections
… the relationship between tooth withdrawal and specific gravity for southern pine lumber and four different plate-to-wood load orientations, and b) to demonstrate how these relationships could be applied to new lumber grades to predict tooth withdrawal performance so that additional testing …
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Investigation of the critical specific gravity for cables and pipelines during various backfilling and installation processes
… purpose of the investigation was to optimise the specific gravity (SG) of pipelines and cables to minimise flotation or movement during installation. The issues under considerations were the flotation of pipelines/cables in high moisture content fine grained materials due to jet trenching and the …
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Modeling increased height, diameter, and specific gravity effects on yield estimates in planted loblolly pine stands
Increased growth of Pinus taeda L. plantations is expected from genetic improvement and intensified cultural practice. It is necessary for forest managers to have a means for estimating the yield of forest stands after increased growth occurs. Several models were tested to determine which could …
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Modeling thinning effects on ring width distribution and wood specific gravity of loblolly pine (Pinus taeda L.)
… in this study: 1) thinning effects on ring specific gravity 2) thinning effects on ring width distribution 3) thinning effects on stem form, and 4) prediction models for these quantities. The study showed that thinning does not significantly affect ring specific gravity, whereas its effects …
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Effect of Minimum Suppression and Maximum Release Years on Compression Parallel to Grain Strength and Specific Gravity for Small-sized Yellow-poplar (Liriodendron tulipifera L.) Specimens
… that there is little or no relationship between specific gravity and ring width or growth rate in yellow-poplar (Liriodendron tulipifera L.). Because most mechanical properties of wood are also closely related to specific gravity, it would thus be of interest to learn how minimum suppression and …
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An investigation of the simultaneous effect of diameter, velocity, temperature, and specific gravity upon the friction factor in Fanning's equation for the flow of water in pipes
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Business and Engineering Administration, 1922.
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Shrinkage characteristics of lodgepole pine
… the only factor that had a significant effect on specific gravity; specific gravity decreased with increasing tree diameter. For var. Iatifolia, latitude was the only factor that had a significant effect on specific gravity; in general, specific gravity increased with increasing latitude. …
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Strength Properties of Juvenile and Mature Wood of Twelve Families of Loblolly Pine (Pinus Taeda L.)
… families were from parents which had high wood specific gravity and six were from parents which had low wood specific gravity. Thirty-two-year-old trees, that had been planted at Many, Louisiana, were sampled and juvenile and mature wood test specimens were prepared. Maximum crushing strength, …
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The Influence of Flooding on Contributions of Spartina Alterniflora Roots to Salt Marsh Soil Volume in a Field Setting
… hydrologic regimes. The research presented here specifically investigates the spatial and temporal relationships among the specific gravity of live roots, soil chemistry, and flooding regime for the macrophyte Spartina alterniflora Loisel. in natural, salt marsh, field settings located across …
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Evaluation of yield and quality of five potato cultivars grown in Southwest Virginia
… were analyzed for yield, percent dry weight, specific gravity, soluble protein, and ascorbic acid. Thereafter. tubers were cold stored at 3 C for six weeks, reconditioned at 25 C for two weeks, and analyzed for percent dry weight, specific gravity, soluble protein, and ascorbic acid. Potato …
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Anatomical and phenological Variation of Liquidambar Styraciflua L. Under Controlled Environmental Conditions
… of variation in fiber tracheid length, vood specific gravity, and time of apical bud formation existed vithin two populations of Liquidambar styraciflua L. from south central Kentucky. The variation exhibited by these populations may be attributed to the self-sterility of Liquidaribar and the …
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The concentration of germanium in coal
… coal was sampled and split into size and specific gravity fractions. The specific gravity fractions were analyzed for ash, volatile matter, fixed carbon, and germanium. Richer fractions of the coal were further treated by solvent extraction, and on the basis of these tests, extraction …
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