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 42 for “"diameter distribution"”.
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Diameter distribution for a compressed air, nebulizer atomizing system
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1991.
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Compatible whole-stand and diameter distribution models for loblolly pine plantations
A method was developed to approximate the diameter distribution of unthinned plantations of loblolly pine from whole stand predictions of stand attributes. The beta probability density function (pdf) and the Weibull pdf were used as models for the diameter distribution function for estimating a …
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Investigation of a Simulated Annealing Cooling Schedule Used to Optimize the Estimation of the Fiber Diameter Distribution in a Peripheral Nerve Trunk
… studies it was determined that the fiber diameter distribution in a peripheral nerve could be estimated by a simulation technique known as group delay. These results could be further improved using a combinatorial optimization algorithm called simulated annealing. This paper explores the …
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MODELING DIAMETER DISTRIBUTION OF LOBLOLLY PINE PLANTATIONS IN RESPONSE TO MID-ROTATION THINNING TREATMENTS AND ASSING THE ECONOMIC RETURNS IN WESTERN GULF COASTAL PLAIN
… thinning regimes incorporating row thinning on diameter distribution and timber product allocation is of considerable importance in the management of loblolly pine (<em>Pinus taeda</em>) plantations within the Western Gulf Coastal Plain. This study utilized data from a thinning study plots …
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An investigation of a bivariate distribution approach to modeling diameter distributions at two points in time
A diameter distribution prediction procedure for single species stands was developed based on the bivariate S<sub>B</sub> distribution model. The approach not only accounted for and described the relationships between initial and future diameters and their distributions, but also assumed future …
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A comparison of forest growth and yield models for inventory updating
… and yield models examined were: a whole stand, a diameter distribution - parameter prediction, a diameter distribution - parameter prediction, and an individual tree. Three different validation approaches were used to create fitting and validation data sets from permanent plot remeasurement data, …
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Stand dynamics, growth, and yield of genetically enhanced loblolly pine (Pinus taeda L.)
… dynamics. Height-age relationships, height and diameter relationships and distributions, and intraspecific competition were investigated in second generation open-pollinated, controlled-pollinated, and clonal loblolly pine with an objective of characterizing the nature and magnitude of changes …
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Modeling increased height, diameter, and specific gravity effects on yield estimates in planted loblolly pine stands
… and North Carolina. Constant growth increases in diameter, height, and wood density were considered. The models considered were multiple regression and the diameter distribution approach using the beta distribution. Under the diameter distribution approach alternatives involving a piecewise …
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Applications of ecological modeling in managing Central Appalachian upland oak stands for old-growth characteristics
… an effort to characterize species composition, diameter distribution and canopy structure. A computer-based ecosystem/gap model (JABOWA-3) was modified and used to simulate silvicultural manipulations in the younger stands that would reproduce older forest characteristics. Various silvicultural …
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A comparison of yield estimation techniques for old-field loblolly pine plantations
… approaches for first approximating the frequency distribution of tree diameters, and then estimating stand yield from individual tree volume equations and the approximate diameter distribution. The accuracy and precision of the stand yield estimates and the diameter distribution approximations …
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Gas phase production of single-walled carbon nanotubes
… pentacarbonyl. The yield of nanotubes and their diameter distribution can be varied by varying process parameters: nanotubes as small as 0.6 nm in diameter, corresponding to the size of a C60 molecule, have been generated. This process shows great promise for scaling up for bulk production of …
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Alignment and characterization of carbon nanotubes of photolithographically patterned electrodes
… spectroscopy. Finally, the information on the diameter distribution and the energy of the electronic transitions of the resonant suspended SWNTs obtained from Raman spectroscopy is compared to other published works to make (n,m) assignments of a number of suspended SWNTs.
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Towards a fullerene-based nanotechnology: The (10,10) tube
… geometry, while X-ray diffraction shows a narrow diameter distribution, centered around 1.36 nm. In conclusion, the particular armchair tube matching the observed diameter, labeled the (10,10) tube, is the most prominent individual tube in the investigated samples. The astonishing efficiency with …
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A stand level multi-species growth model for Appalachian hardwoods
… and yield model was developed to predict future diameter distributions of thinned stands of mixed Appalachian hardwoods. The model allows prediction by species groups and diameter classes. Stand attributes ( basal area per acre, trees per acre, minimum stand diameter, and arithmetic mean dbh) …
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An investigation, comparison, and development of individual tree competition models
… Analyses indicated that, depending on stand, diameter distribution and spatial arrangement, the model acted either as a competition advantage or as a competition disadvantage model. Attempts to discover the nature of the change in behavior of the model within stands over time were made by …
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Modeling the diameter and locational distributions of branches within the crowns of loblolly pine trees
… pine was quantified via analysis of branch diameters and location, both along and around the bole, using observational data from 68 trees. The trees analyzed ranged in size from 11.1 to 31.6 cm in DBH and from 8.30 to 25.67 m in height, and were growing in Piedmont and Atlantic Coastal Plain …
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Crush Strength Analysis of Hollow Glass Microspheres
… this goal was to measure the microsphere diameter distribution. Microsphere diameter is a major factor affecting strength as well as the Weibull parameters. Two different methods, microscopy counting and laser light scattering, used in the research yielded similar distributions. The main …
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Biocompatibility assessment of a sol-gel modified electrospun ventricular shunt catheter
… typical ofpolyurethanes, and changes the diameter size and distribution of thefibres, with modified materials exhibiting a narrower diameter distribution. Titanium is well dispersed within the fibres, while zinc tendsto segregate on the surface. All electrospun materials are effective …
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Economic Comparisons Between an Even-Aged and an Uneven-Aged Loblolly Pine Silvicultural System
… (NPV) are found by quantifying the effects of diameter distribution (Q factor), maximum diameter, cutting cycle, and residual basal area on NPV. For the benchmark inputs, the regime yielding the highest NPV had a maximum diameter of 12 inches, residual basal area of 45 ft²/acre, and a cutting …
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Background Flow Influence on Impulsive Jet-Driven Micro Droplet Dispersal
… droplets suspended in them in a predetermined diameter distribution. The droplets are allowed to breakup by formation of sheets and evaporate using standard evaporation models. This forms droplet nuclei which directly influences the range of spread. Simulations focusing on the near-field and …
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