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 50 for “"R-Value"”.
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The preparation of a polyurethane elastomer and evaluation of the mechanical properties
… material were prepared. In the first group the R value was varied from 1.0 to 4.5, (the ratio of 33’ Bitolyene 44’ diisocyanate to polyester) and fixed amounts of excess diisocyanate were used. Ethylene glycol was used as the cross-linking agent. In the second and third groups the R value was …
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Design and Construction of a Guarded Hot Box Facility for Evaluating the Thermal Performance of Building Wall Materials
… design and build a guarded hot box to test the R-Value of building materials. The Riverside Energy Efficiency Laboratory is looking to expand their testing capabilities by including this service. Eventually, the laboratory will become energy star certified. A guarded hot box facility consists of …
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Effects of various anthropometric measurements on fastball velocity in professional relief pitchers.
… model displayed no significant correlation (r value; 0.131, p value; .535) and also showed that the independent variables accounted for only 1.7% of the dependent variable's value (R2 = .017). The mean average fastball velocity was 93.256 mph while average heights and weights of the players …
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Evaluation of subgrade strength and flexible pavement designs for reliability
… variation and density distribution function of R-value are determined. A sub-section procedure is employed to deal with variability associated with subgrade strength in flexible pavement design. A single design for roadway sections does not yield an effective design regarding target reliability, …
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Methodology for Determining the Variance of the Taylor Factor: Application in Fe-3%Si
… The connection between the variance of the R-value and variance of the Taylor factor is considered. Although only a weak connection was found, it was observed that relatively small variations in the Taylor factor yield large variances in the R-value.
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Investigation of Applicable Seismic Response Modification Factor For Three-Hinge Glulam Tudor Arches Using FEMA P-695
… to be evaluated for each of seven design R-values within two gravity load cases. With the performance groups evaluated, it was determined that only groups within the low gravity load level designs were successfully able to pass, none of the groups designed for high gravity loads passed the …
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The Influence of Leadership Styles on Students Academic Achievement in Secondary Schools: A Case of Selected Secondary Schools in Morogoro Municipality
… students academic achievement/performance (R-value was 0.932), implying that there is a strong and positive influence and significant at p=0.004 level of democratic leadership style on students academic achievement. For Laissez-faire leadership style, the relationship revealed negative …
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Modeling the impact of gypsy moth defoliation in individual tree mortality and basal area growth of northern hardwoods of central Pennsylvania
… from no fit for three of the species to an R value (a derivation of Akaike's information criterion) of .613 for white oak. The inclusion of defoliation in the models had a varied effect. For four of the species percent defoliation was not significant. For hickory and white oak respectively, …
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Regionalism and the design of low-rise building envelope systems
… practice area versus best practice and high r-value systems. The results demonstrate that the application of the three-pronged method yields data architects can use to improve energy performance, reduce costs and limit negative environmental impacts.
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Factors affecting drug distribution in granules.
… granule sizes has been elucidated. A higher R value in the granule formulation was found to cause some solute dissolution including the drug in the initially overwetted region. The binder distribution from this region now containing dissolved components enriched the drier area of the mix with …
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Permanent Bracing Design for MPC Wood Roof Truss Webs and Chords
… both 2x4 and 2x6 webs braced with one CLB, the R-value was 2.3% for all web lengths studied. For both 2x4 and 2x6 webs braced with two CLB's, the R-value was 2.8% for all web lengths studied. The web and CLB lumber species did not affect the R-values for the braced webs. Calculated R-values for …
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Academic enablers and dance: a correlation study
… analysis was performed. The results gave an r value (correlation coefficient) of -0.077. The levels indicate that, for this study, there was no relationship between the numbers of hours spent dancing per week and the level of academic enablers.
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Investigating the impact of organisational culture on employee productivity at the Namibian Ports Authority
… on the dependent variable, as evidenced by the R-value of 0.978 for the regression coefficient. Based on the research conclusions, the study recommends that NamPort’s executive team recognises the critical role of organisational culture in the organisation’s growth and success. In addition, …
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The Relationship Between Student Performance on a Paper and Pencil Test of Conservation Concepts and Performance on a Piagetian Interview Instrument
… on the paper and pencil test. The resulting R² value of .081 indicated that no significant relationship existed between the weighted combination of CAC subtest scores and performance on the paper and pencil test. In conclusion, concurrent validity was not established for the nine-item paper and …
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Strip with gradient properties by annealing in reactive atmospheres
… secondary work embrittlement (SWE). The r-value was slightly influenced by the added carbon atoms, the r-values were in the range between 3 and 2. The higher the carbon potential of a carburizing atmosphere, the higher is the carbon pickup. This could lead to the formation of an austenite …
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An Analysis of Body Condition Scores, Ultrasonographic Fat Thickness, and the Interaction Between the Two on Conception Rates in Yearling Cross-Bred Heifers
… R² using all six traits produced a very low R² value (.07). A correlation was found between BCS and UFT (.36). Also, UFT and UPF were correlated to one another (.30). Low first service conception rates (28%-50%) could possibly be contributed to the inexperience of technicians used in heat …
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Simulation of weight gain and feed consumption of turkeys
… production system was developed to predict values of flock performance indicators of significant economic importance, namely body weight and feed consumption. Existing weather simulation models were combined and modified in order to develop a model that predicted daily dry-bulb temperature …
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Development of a new device to measure finger's mean arterial pressure
… using Pearson correlation coefficient, the R value of 0.982 and 0.9416 are obtained when the data of finger’s mean arterial pressure and brachial mean arterial pressure (oscillometric based and korotkoff based respectively) are compared. These results show that the Finger M.A.P device produced …
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Structural modelling of cause and effect factors of construction waste generation in Malaysian Construction Industry
… It was found that the model is fit due to the R² value of 0.451 (R2 ≥ 0.26 = substantial). The model identifies that all 10 groups are significant with t-value ≥ 2.58 from bootstrapping process of 5000 random samples. The model indicates that Handling of Materials and Equipment group has the …
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The properties of concrete containing coconut shell as fine aggregate
… through the thermal conductivity test (k-value) and thermal resistance (r-value) calculations. After collecting the data, a relationship analysis was conducted to find the optimum percentage of fine coconut shell replacement. Next, from the optimum percentage, a wall panel was constructed …
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