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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 27 for “"effective length"”.
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Effective length factors for solid round chord members of guyed towers.
… of the University of Windsor to determine the effective length factors of the chord members. Two different manufacturers, viz., Pirod Inc., Plymouth, Indiana, and ERI Inc., Chandler, Indiana, provided the test specimens. All tower sections were fabricated from solid round members and were …
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Effective Length of Fractured Wires and a Fatigue Analysis of Wire Rope
This work is initially concerned with a determination of the contact loads and stresses between the wires in a wire rope under axial loading. The rope is regarded as a collection of smooth helical rods. The determination of the contact stresses between wires is based on the solution of Hertz's …
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Effective Lengths of Web-Tapered Columns in Rigid Metal Building Frames
Current procedures for estimating effective length factors for web-tapered members rely heavily on the use of charts and graphs. This makes them difficult to implement using a computer. In addition, they are often based on unrealistic assumptions. In cases where these assumptions are not satisfied, …
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Ultra-Wideband Antenna Characterization and Modeling
… from pole/residue models of antenna realized effective length. Thus, a pole/residue model of the antenna realized effective length presents a complete description in both the time and frequency domains. Once such a model is available, one can obtain the antenna pattern, directivity and gain in …
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Design and experimental study on pressure compensating emitters in drip irrigation
… were studied: outlet hole diameter and effective length. Prototypes were made varying these parameters, and flow tests were conducted to collect data on pressure and flow rate. Introducing a valve to control the flow significantly improved the control of experiments and the ability to …
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Beam characterization at the neutron radiography reactor
… beam, including determination of the beam's effective length-to-diameter ratio, neutron flux profile, energy spectrum, image quality, and beam divergence, is vital for producing quality radiographic images. This thesis characterized the east neutron imaging beamline at the Idaho National …
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Mechanisms of convective drying in thick beds of solids
… and bottom during the constant rate period. An effective method was introduced for predicting the critical moisture content. During the falling rate the profiles showed the existence of a receding evaporation plane; this divided the system into a hotter dry zone in the upper section and a wet …
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The rheological characterisation of non- Newtonian slurries using a novel balanced beam tube viscometer
… has been done in the following areas: (i) The effective length of the BBTV tubes. (ii) Interpretation of the data obtained using the BBTV in both the laminar and turbulent flow regimes. (iii) Comparison with the rotary type viscometer. Kaolin clay and uranium tailings slimes slurries of …
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Chaotic advection and mixing in a western boundary current-recirculation system : laboratory experiments
… I quantify the mixing in each case using effective diffusivity, Keff, and a corollary effective length, Leff, as derived by Nakamura (1995, 1996). This approach involves diagnosing the geometric complexity of a tracer field. Geometric complexity is indicative of advective stirring. Because …
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Chaotic advection and mixing in a western boundary current-recirculation system : laboratory experiments
… I quantify the mixing in each case using effective diffusivity, Keff, and a corollary effective length, Leff, as derived by Nakamura (1995, 1996). This approach involves diagnosing the geometric complexity of a tracer field. Geometric complexity is indicative of advective stirring. Because …
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A nondimensional model for axial digging in granular materials
… is modeled as a column in buckling; its column effective length factor is calculated. We solve two optimization problems. First, we limit the axial force the digger is allowed to experience and analytically solve for the maximum depth dug. This analysis is compared to experimental data. Second, …
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Specimen size effects in slow strain-rate testing
… to failure was inversely proportional to an effective ratio of length to diameter, ((D - 2a)L / D²), where D is the specimen diameter, L is the length of the reduced cross section of the specimen, and a is the environmentally induced crack depth. This effective length to diameter ratio …
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Predictive Modelling of CFRP-Steel Double Strap Joints
… modelling, one may compute the failure loads and effective length of the steel/CFRP specimens quickly, simply and accurately. Additionally, factors affecting these parameters are also investigated in this study.
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Implementation of Microwave Transmissions for Rocket Exhaust Plume Diagnostics
… and soot. The exhaust plume increases the effective conductor length of the rocket. A conductor in the presence of an electric field (e.g. near the electric charge stored within a cloud) can channel an electric discharge. The electrical conductivity of the exhaust plume is related to its …
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Analysis of the Effects of Adaptive Ramp Metering on Measures of Efficiency with a Proposed Framework for Safety Evaluation
… as freeway widening. This thesis explores the effectiveness of ARM implementation on an 18 mile segment of the Interstate 80 (I-80) corridor in the Bay Area residing in northern California. Smaller segments of this particular segment were analyzed to determine the effective length of ARM on …
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Modeling the Transient Response of a Thermosyphon
… was the accounting for temporal changes in the effective length of the vapor space due to the expanding and contracting of non-condensable gases in the vapor space. The model assumed quasi-steady one-dimensional vapor flow, transient one-dimensional flow in the falling liquid film, and transient …
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Experimental and numerical investigation of modular steel bridges
… the AASHTO-LRFD equation to better reflect the effective length of members. Reinforcing the top and bottom chords increased the bridge’s ultimate capacity by 90% and doubled its stiffness. The strain measurements also indicated a significant role of the deck in load distribution, evidenced by …
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FOOTING FIXITY OF BRIDGE PIER WITH END-BEARING PILE FOUNDATION
… at the base of a column. By using G values, the effective length factor K of the column can be calculated. The K value is used to check if the effect of slenderness needs to be considered for the column design. Moreover, the rotation of structural members is a major factor in determining the …
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Lateral buckling of steel I-section bridge girders braced by U-frames
… and first order elements were sufficiently effective for the analysis. This was followed by further investigation of a wider range of I-section girders using ABAQUS. The ultimate bending resistance of the girders obtained from finite element analysis was in general greater than the …
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Υβριδική στοχαστική-ηλεκτρομαγνητική ανάλυση της λειτουργίας των κεραίων σε συστήματα διαφορισμού λήψης και πολλαπλών εισόδων πολλαπλών εξόδων
Στην παρούσα διδακτορική διατριβή, με βάση την ηλεκτρομαγνητική θεωρία,παρουσιάζεται μία μεθοδολογία για τη μοντελοποίηση πολύθυρων κεραιών κατά την κατάσταση εκπομπής και λήψης τους, δύο στοχαστικές μεθοδολογίες για την αξιολόγησή τους κατά τη λειτουργία τους σε συστήματα διαφορισμού λήψης και μία …
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