Environmental And Age-Related Deterioration Of Concrete Median Barriers

10.32920/ryerson.14657106.v1 ◽

2021 ◽

Author(s):

Kavitha. Madhu

Keyword(s):

Experimental Study ◽

Three Dimensional ◽

Plain Concrete ◽

Temperature Data ◽

Time Dependent ◽

Three Dimensional Model ◽

Age Related ◽

Time Period ◽

Transient Thermal ◽

Concrete Barrier

The purpose of this research was to understand the time-dependent environmental and age-related deterioration mechanisms in the un-reinforced concrete barrier walls used in Ontario. The study concentrated mainly on the response of plain concrete barrier walls to time-dependent thermal loads and associated volume changes. The research involved temperature data collection, experimental study and numerical analysis. The temperature data was collected on an hourly basis from the temperature sensors installed in a live plain concrete barrier wall. In the experimental study, concrete samples were exposed to varying temperature and environmental conditions and tested to monitor the deviation of significant concrete parameters like compressive strength, tensile strength, modulus of elasticity etc. Based on the results from the experimental study and the temperature data collected from the sensors, a non-linear transient thermal and structural analysis was carried out on a three-dimensional model, developed using ANSYS program, for a time period of three years.

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Transient thermal and stress analysis of maxillary second premolar tooth using an exact three-dimensional model

Indian Journal of Dental Research ◽

10.4103/0970-9290.66624 ◽

2010 ◽

Vol 21 (2) ◽

pp. 158 ◽

Cited By ~ 1

Author(s):

MaryamAlsadat Hashemipour ◽

Ali Mohammadpour ◽

Seiied AbdolrezaGandjalikhan Nassab

Keyword(s):

Stress Analysis ◽

Three Dimensional ◽

Dimensional Model ◽

Three Dimensional Model ◽

Transient Thermal

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New time-dependent photorefractive three-dimensional model: application to self-trapped beam with large bending

Journal of the Optical Society of America B ◽

10.1364/josab.25.001081 ◽

2008 ◽

Vol 25 (6) ◽

pp. 1081 ◽

Cited By ~ 18

Author(s):

Fabrice Devaux ◽

Virginie Coda ◽

Mathieu Chauvet ◽

Rémy Passier

Keyword(s):

Three Dimensional ◽

Time Dependent ◽

Dimensional Model ◽

Three Dimensional Model ◽

Model Application ◽

New Time

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Cooking with Quadratics

Mathematics Teacher ◽

10.5951/mt.104.4.0308 ◽

2010 ◽

Vol 104 (4) ◽

pp. 308-314

Author(s):

Luajean N. Bryan

Keyword(s):

Three Dimensional ◽

Quadratic Equation ◽

Temperature Data ◽

Dimensional Model ◽

Three Dimensional Model ◽

Basic Properties

Using basic properties of a parabola, students collect and analyze temperature data and construct a three-dimensional model from a quadratic equation—to cook marshmallows!

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Use of Dynamic Meshes for Transient Metal Temperature Prediction

Volume 4: Heat Transfer, Parts A and B ◽

10.1115/gt2012-68782 ◽

2012 ◽

Cited By ~ 4

Author(s):

Dario Amirante ◽

Nicholas J. Hills ◽

Christopher J. Barnes

Keyword(s):

Thermal Analysis ◽

Three Dimensional ◽

Heat Fluxes ◽

Time Dependent ◽

Correct Prediction ◽

Three Dimensional Model ◽

Transient Regimes ◽

Initial Mesh ◽

Solid Part ◽

Mesh Technique

This paper describes the thermal analysis conducted on a three-dimensional model of a stator well contained within a turbine assembly. A methodology has been developed for coupled fluid-solid modelling accounting for the boundary deflections predicted by the structural analysis. The coupling is obtained through an iterative process between a finite element code (FEA) performing structural and thermal analysis for the solid part, and a finite volume solver for the CFD. As the engine runs transiently through a specified flight cycle, the FEA predictions of metal deformations and temperatures are passed to the CFD code, which in turns computes the heat fluxes over the metal surfaces. A robust moving mesh technique is used to automatically modify an initial mesh, based on the cold geometry, to the time dependent boundary deflections. Thus, the methodology guarantees that the CFD is always carried out on the hot-running geometry. A thorough investigation into the flow physics involved in the stator well is conducted. It is shown that an accurate thermal modelling for transient regimes necessitates the correct prediction of the time dependent clearances present in the system. Even small changes in the clearances may cause a transition between different dynamic behaviours, egress or ingestion, ultimately leading to drastically different thermal responses.

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Experimental and Numerical Study of an Electrical Thermal Storage Device for Space Heating

Energies ◽

10.3390/en11092180 ◽

2018 ◽

Vol 11 (9) ◽

pp. 2180 ◽

Cited By ~ 3

Author(s):

Guizhi Xu ◽

Xiao Hu ◽

Zhirong Liao ◽

Chao Xu ◽

Cenyu Yang ◽

...

Keyword(s):

Natural Convection ◽

Numerical Study ◽

Three Dimensional ◽

Thermal Storage ◽

Flow Channel ◽

Electrical Heating ◽

Space Heating ◽

Storage Device ◽

Three Dimensional Model ◽

Transient Thermal

An electrical thermal storage (ETS) device for space heating is designed in this study. The proposed device is charged by the off-peak electricity and releases its thermal energy to warm the space all day long. The natural convection occurring in the flow channel drives the flowing of air to be heated up and warm the space. The dynamic process of a fully charging/discharging cycle of the device is tested. Meanwhile, a three-dimensional model is developed to simulate the transient thermal behavior. It is found that the experimental and numerical results agree with each other which indicates the validation of the proposed numerical model. The results show that the temperatures of the bricks and the outlet air can be as high as 1002 K and 835 K, respectively. The natural convection occurring in the flow channel transfers 40.4% of the total electrical heating energy to the space for the charging process and 26.9% for the discharging process. Heat losses to the space through the adiabatic material shares 13.3% of the total heating energy for the charging process and 7.2% for the discharging process. Based on those findings, three methods are recommended to improve the device in the successive research.

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A Three Dimensional Model for Generating the Texture in B-Scan Ultrasound Images

Ultrasonic Imaging ◽

10.1177/016173468300500305 ◽

1983 ◽

Vol 5 (3) ◽

pp. 253-279 ◽

Cited By ~ 8

Author(s):

Mitchell M. Goodsitt ◽

Ernest L. Madsen ◽

James A. Zagzebski

Keyword(s):

Three Dimensional ◽

Time Dependent ◽

Ultrasound Images ◽

Dimensional Model ◽

Three Dimensional Model ◽

Gray Scale ◽

Receiver System ◽

Gray Scale Image ◽

Theory And Experiment ◽

Good Agreement

A three-dimensional model for production of gray scale texture in ultrasound B-mode images is described. The model computes time-dependent echo signals resulting from scattering of acoustic pulses by particles randomly distributed in an attenuating medium and transforms these signals into a gray scale image. Specific transducer and pulser-receiver characteristics are accounted for, as well as the three-dimensional nature of the problem, without loss of computational efficiency. The model generates texture that closely corresponds to that found experimentally in ultrasound images of tissue-mimicking phantoms. The dependence of the texture upon the depth of the region that was scanned and on the characteristics of the transducer-receiver system were clearly demonstrated. Good agreement between theory and experiment was found for the texture in phantoms containing simulated spherical low-scatter tumors.

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Distal Insertional Footprint of the Brachialis Muscle: 3D Morphometric Study

Anatomy Research International ◽

10.1155/2015/786508 ◽

2015 ◽

Vol 2015 ◽

pp. 1-6

Author(s):

Srinath Kamineni ◽

Abdo Bachoura ◽

William Behrens ◽

Ellora Kamineni ◽

Andrew Deane

Keyword(s):

Three Dimensional ◽

Muscle Length ◽

Morphometric Study ◽

Three Dimensional Model ◽

Age Related ◽

Muscle Insertion ◽

Projected Length ◽

Brachialis Muscle ◽

Significant Difference ◽

Surface Length

Objective. The purpose of this study is to describe the three-dimensional morphometry of the brachialis muscle at its distal attachment to the ulna. Methods. Fifty cadaveric elbows were dissected and the brachialis distal insertion was isolated on the ulna bone and probed with a three-dimensional digitizer, to create a three-dimensional model of the footprint. Measurements and analysis of each footprint shape were recorded and compared based on gender and size. Results. There was significant gender difference in the surface length (P= 0.002) and projected length (P= 0.001) of the brachialis footprint. The shapes of the footprint also differed among the specimens. Conclusion. The shape of the brachialis muscle insertion differed among all the specimens without significant variation in gender or sides. There was also a significant difference in muscle length between males and females with little difference in the width and surface area. Significance. The information obtained from this study is important for kinematic understanding and surgical procedures around the elbow joint as well as the understanding of the natural age related anatomy of the brachialis footprint morphology.

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