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Full-Text Articles in Engineering
Computations And Detailing Of Pressure Vessels Having Unusual Requirements In Design, Anil Patnaik, Ashenafi Hegana, Tirumalai Srivatsan
Computations And Detailing Of Pressure Vessels Having Unusual Requirements In Design, Anil Patnaik, Ashenafi Hegana, Tirumalai Srivatsan
Anil Patnaik
The provisions of Australian Standard AS 1210-1989 for design and detailing of unfired pressure vessels can be applied to commonly encountered design situations where the shells have small openings. The technique of finite element analysis is a convenient and powerful tool for the purpose of computational stress analysis when the design requirements are such that either the openings are large, or where concentrated loads and/or thermal movements are present. This paper provides a summary of one such practical design of a pressure vessel. While the computational technique using finite element analysis simplifies the stress analysis of pressure vessels considerably, the …
Study Of Seasonal Rainfall Infiltration Via Time-Lapse Surface Electrical Resistivity Tomography: Case Study Of Gamboa Area, Panama Canal Watershed, Alexis Mojica, Irving Díaz, Carlos Ho, Fred Ogden, Reinhardt Pinzón, José Fábrega, David Vega, Jan Hendrickx
Study Of Seasonal Rainfall Infiltration Via Time-Lapse Surface Electrical Resistivity Tomography: Case Study Of Gamboa Area, Panama Canal Watershed, Alexis Mojica, Irving Díaz, Carlos Ho, Fred Ogden, Reinhardt Pinzón, José Fábrega, David Vega, Jan Hendrickx
Fred L. Ogden
The present investigation was focused on the variations in rainwater infltration experienced by soils of Gamboa zone (Panama Canal Watershed) during various seasons of the year, employing a time-lapse analysis of electrical resistivity tomography (ERT). In 2009, a total of 3 geoelectrical tests were undertaken during the dry, transition and rainy seasons across a profle 47 m in length, strategically distributed on site. The results obtained in this study showed strong variations in calculated resistivity between these seasons, taking the dry season as a reference with decreases and increases of percent diference of resistivity between -20% and -100%, and between …
Analysis Of Cell Locomotion On Ligand Gradient Substrates, Alireza Sarvestani, Esmaiel Jabbari
Analysis Of Cell Locomotion On Ligand Gradient Substrates, Alireza Sarvestani, Esmaiel Jabbari
Esmaiel Jabbari
No abstract provided.
Morphology Development In Main-Chain Liquid Crystalline Polymer Fibers During Solvent Evaporation, Pratyush Dayal, Andrew Guenthner, Thein Kyu
Morphology Development In Main-Chain Liquid Crystalline Polymer Fibers During Solvent Evaporation, Pratyush Dayal, Andrew Guenthner, Thein Kyu
Thein Kyu
A nonequilibrium thermodynamic approach has been developed for describing the emergence of fiber morphologies from a liquid crystalline polymer solution undergoing solvent evaporation, including fibrillar structures, concentric rings, and spiral structures. We utilized Matsuyama–Kato free energy for main-chain liquid crystalline polymer (MCLCP) solutions, which is an extension of Maier–Saupe theory for nematic ordering and incorporates a chain-stiffening, combined with Flory-Huggins free energy of mixing. Temporal evolution of the concentration and nematic order parameters pertaining to the above free energy density of liquid crystalline polymer solution was simulated in the context of time-dependent Ginzburg–Landau theory coupled with the solvent evaporation rate …
Phase Equilibria And Phase Separation Dynamics In A Polymer Composite Containing A Main-Chain Liquid Crystalline Polymer, Do Kim, Thein Kyu, Takeji Hashimoto
Phase Equilibria And Phase Separation Dynamics In A Polymer Composite Containing A Main-Chain Liquid Crystalline Polymer, Do Kim, Thein Kyu, Takeji Hashimoto
Thein Kyu
Various topological phase diagrams of blends of main-chain liquid crystalline polymer (MCLCP) and flexible polymer have been established theoretically in the framework of Matsuyama–Kato theory by combining Flory–Huggins (FH) free energy for isotropic mixing, Maier–Saupe (MS) free energy for nematic ordering in the constituent MCLCP, and free energy pertaining to polymer chain-rigidity. As a scouting study, various phase diagrams of binary flexible polymer blends have been solved self-consistently that reveal a combined lower critical solution temperature (LCST) and upper critical solution temperature (UCST), including an hourglass phase diagram. The calculated phase diagrams exhibit liquidus and solidus lines along with a …
Energy Modeling Of Wireless Sensor Nodes Based On Petri Nets, Ali Shareef, Yifeng Zhu
Energy Modeling Of Wireless Sensor Nodes Based On Petri Nets, Ali Shareef, Yifeng Zhu
Yifeng Zhu
Energy minimization is of great importance in wireless sensor networks in extending the battery lifetime. Accurately understanding the energy consumption characteristics of each sensor node is a critical step for the design of energy saving strategies. This paper develops a detailed probabilistic model based on Petri nets to evaluate the energy consumption of a wireless sensor node. The model factors critical components of a sensor node, including processors with emerging energy-saving features, wireless communication components, and an open or closed workload generator. Experimental results show that this model is more flexible and accurate than Markov models. The model provides a …
Drilling Of Carbon Composites Using A One Shot Drill Bit. Part 2 Empirical Modeling Of Maximum Thrust Force, Marta Fernandes, Christopher Cook
Drilling Of Carbon Composites Using A One Shot Drill Bit. Part 2 Empirical Modeling Of Maximum Thrust Force, Marta Fernandes, Christopher Cook
Christopher Cook
In order to extend tool life and improve quality of hole drilling in carboncomposite materials, a better understanding of ‘oneshot’ hole drilling is required. This paper describes the development of an empirical model of the maximum thrust force and torque produced during drilling of carbon fiber with a ‘oneshot’ drillbit. Shaw's simplified equations are adapted in order to accommodate for tool wear and used to predict maximum thrust force and torque in the drilling of carboncomposite with a ‘oneshot’ drillbit. The mathematical model is dependent on the number of holes drilled previously, the geometry of the drillbit, the feed used …
Dynamic Failure Properties Of The Porcine Medial Collateral Ligament-Bone Complex For Predicting Injury In Automotive Collisions., Kristen Billiar, Louis Peck, Malcolm Ray
Dynamic Failure Properties Of The Porcine Medial Collateral Ligament-Bone Complex For Predicting Injury In Automotive Collisions., Kristen Billiar, Louis Peck, Malcolm Ray
Kristen L. Billiar
The goal of this study was to model the dynamic failure properties of ligaments and their attachment sites to facilitate the development of more realistic dynamic finite element models of the human lower extremities for use in automotive collision simulations. Porcine medial collateral ligaments were chosen as a test model due to their similarities in size and geometry with human ligaments. Each porcine medial collateral ligament-bone complex (n = 12) was held in a custom test fixture placed in a drop tower to apply an axial impulsive impact load, applying strain rates ranging from 0.005 s(-1) to 145 s(-1). The …