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 19 of 19 for “"back-calculation"”.
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Estimating HIV incidence from multiple sources of data
… services. Bayesian CD4-based multi-state back-calculation methods are a key tool for monitoring the HIV epidemic, providing estimates of HIV incidence and diagnosis rates by disentangling their competing contribution to the observed surveillance data. Improving the effectiveness of public …
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The efficacy of back calculation methods for determining length at age data and the use of such data to determine growth standards, national growth patterns and recruitment dynamics of roach (Rutilus rutilus (L.)), dace (Leuciscus leuciscus (L.)) and chub (Leuciscus cephalus (L.)) in UK rivers
The use of fish scales to age and back-calculate previous lengths at age and gain age and growth information has long been used as a management tool in fisheries. Calcified structures from fish, including otoliths, fin rays, and vertebrae have been used to gain length at age data. Scales however, …
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Modelling HIV/AIDS epidemic in Nigeria
… program is doubtful. Literature on ordinary back-calculation, nonparametric back-calculation, and modified back-calculation methods was reviewed in detail. Also, an indepth review of disease mapping techniques including multilevel models and geostatistical methods was conducted. The existence …
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Metody anti-windup při řízení lineárních dynamických systémů
… potlačení. Představenými metodami jsou clamping, back-calculation, řízení s vnitřním modelem soustavy a návrh pomocí LMI. Pro poslední dvě zmíněné metody byla vytvořena aplikace pro Matlab. Tyto metody byly následně otestovány na vybraných soustavách pomocí simulace Matlab Simulink. Následně byly …
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Asphalt Perpetual Pavement Design: Utilizing Existing Pavement Systems in Ohio
… similar which validated the data from 2010. FWD back-calculation was used as the basis of determining the condition of the AC base layer. The data were used to calculate layer moduli by way of back-calculation from the Evercalc 5.0 program as well as tensile strain at the bottom of the AC base …
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Spatiotemporal trends and relationships in the abundance, growth, and condition of common nearshore fishes of southwest Lake Michigan
… were done to improve upon otolith length back-calculation methods for future studies of round goby growth. Data were collected at three locations with contrasting habitat complexity. Age data were collected using otoliths of yellow perch and round goby, and Fulton’s condition factor was …
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Sistema automático de aquisição de dados para ensaio triaxial
… theory. This is hoped to contribute to the back calculation of the sanitary fill failure.
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Pre-compensation of nonlinear distortion of a silicon microring modulator in short reach systems
… pre-compensation of this nonlinear distortion by back-calculation. An MRM model is firstly set up using Matlab. Through back-calculation of the model, an electrical drive signal is calculated based on a desired modulator output optical intensity. The back-calculated drive signal has a broad …
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Impact of structure, material properties, temperature curling, and trafficking on load transfer efficiency
… load transfer efficiency (LTE (delta)) and for back calculation of pavement layer stiffnesses. The FAA's finite element analysis program FEAFAA was used to analyze temperature effects on LTE(S) at the joints. This analysis has shown that LTE (S) varies and is sensitive to pavement structure, …
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Use of the Traffic Speed Deflectometer for Concrete and Composite Pavement Structural Health Assessment: A Big-Data-Based Approach Towards Concrete and Composite Pavement Management and Rehabilitation
… jointed-slab-on-ground mathematical model to back-calculate the concrete pavement's and subgrade's stiffness and the transverse joints' load transfer efficiency index [LTE] from the denoised TSD measurements. In this Dissertation, the performance of this back-calculation technique is analyzed …
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In-Situ Behavior of Geosynthetically Stabilized Flexible Pavement
… deflections were analyzed using the MODULUS back-calculation program to determine layer moduli. The measured deflections were used together with elastic, viscoelastic and the MODULUS program to determine the extent of intermixing at base-subgrade interface. The study concluded that a …
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Experimentally Determined Equivalent Roughness Values For Two Types of Longitudinal Straight Duct Produced by a Small Company
… = 0.0001 feet (determined from a recursive back calculation from the experimental data) yielded better predictions of the pressure losses. A regression analysis indicated that both the hydraulic diameter (Dh) and Re were statistically significant factors in determining the f-value. The …
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Growth and Reproduction of Atlantic Chub Mackerel (<i>Scomber colias</i>) in the Northwest Atlantic
… Age-at-50% maturity was estimated as 2.16 (y) by back calculation. Spawning season was estimated to occur during the months of January to April, using histological indicators and evidence of spawning from analysis of historical data on larval fish collections and commercial catch. These results …
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NRCS Curve Number Calibration Using USGS Regression Equations
… a Curve Number can then calibrated through back-calculation. The method of CN calibration using the USGS regression equations was applied to nearly 60 watersheds in the state of Utah for this research. The calibration results obtained using the regression equations were compared to other CN …
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Applications of fish scale analysis to understand growth dynamics of fish populations
… tool in fisheries assessment, specifically the back-calculation of fish lengths. This study highlights the potential errors associated with correction factors (c) because of poor sampling and provides a validation of (c) values. In addition, classical fisheries assumptions about the relationship …
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Prestressed concrete railway crosstie support variability and its effect on flexural demand
The increased presence of instrumentation on railroad track components in revenue service operation has provided vast amounts of data with the potential for improving the current modeling of track systems. The continuous improvement of components and track design depends on fine-scale optimization …
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Multi-state modelling to estimate infectious disease burden
… Firstly, I develop an established multi-state back-calculation method to better estimate the incidence processes underlying the HIV epidemic in England. The updated method is shown, via simulation, to account for measurement bias in markers of disease progression. This method is also shown to …
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LITERATURE REVIEW: The Use of Cation-Exchange Resins in Natural Water Trace Metals Research. ARTICLE: Determination of Free Ion Trace Metal Concentrations in Freshwaters Using Cation-Exchange Resin Equilibrium. A Preliminary Investigation.
… can then subsequently be determined by back calculation of the concentrations eluted from the resin. The sampler employs resin beads retained between two layers of PE mesh, thus allowing flow through the device when deployed vertically in the flow of a stream. Metals are back extracted …
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Mechanistic-Empirical Pavement Design Procedure For Geosynthetically Stabilized Flexible Pavements
… sections. Falling weight deflectometer back-calculation revealed consistently weaker subgrade strength for the geogrid-stabilized and control sections than for the geotextile-stabilized sections over the three year evaluation period. To quantitatively assess the extent of contamination, …