Open Access. Powered by Scholars. Published by Universities.®

Engineering Commons™

Open Access. Powered by Scholars. Published by Universities.®

Journal of Marine Science and Technology–Taiwan

Discipline
Keyword
Publication Year

Articles 631 - 660 of 1299

Full-Text Articles in Engineering

The Geometric Algorithm Of Inverse And Direct Problems With An Area Solution For The Great Elliptic Arcs, Wei-Kuo Tseng, Jiunn-Liang Guo, Chung-Ping Liu Aug 2015

The Geometric Algorithm Of Inverse And Direct Problems With An Area Solution For The Great Elliptic Arcs, Wei-Kuo Tseng, Jiunn-Liang Guo, Chung-Ping Liu

Journal of Marine Science and Technology–Taiwan

The definition of the connecting edge(s) between two vertices in a geography type is the great elliptic minor arc in Microsoft SQL Server’s Geography Type. Similar to the way an edge is defined by Microsoft SQL Server, an edge in Geodyssey’s Hipparchus library is also defined as a great circle arc on a reference sphere. Using Hipparchus for their computations, IBM’s DB2 Geodetic Extender and Informix Geodetic Datablade share this definition. Compact formulae are given for the great elliptic sailing on a spheroid providing solutions to both the forward and inverse problems with exceptional accuracy, and latitude in terms of …

Go to article

Effect Of Mortar Coating On Concrete Carbonation, Wen-Hu Tsao, Ming-Te Liang, Jiang-Jhy Chang, Nai-Ming Huang Aug 2015

Effect Of Mortar Coating On Concrete Carbonation, Wen-Hu Tsao, Ming-Te Liang, Jiang-Jhy Chang, Nai-Ming Huang

Journal of Marine Science and Technology–Taiwan

The mechanism of the effect of mortar coating on carbonation of concrete is investigated. Theoretical methods of Fick's first and second laws of linear diffusion are used to calculate the carbonation depth of concrete without and with mortar coating, respectively. Theoretical analyses are also done to obtain the carbonation retard coefficients of mortar coating on concrete with surface coatings. A great deal of well organized experimental tests are carried out to verify the values of calculation. The results of present study indicate that the suitable mortar coating on concrete can effectively delay carbonation of concrete. The carbonation depth is inversely …

Go to article

Analysis Of Electromagnetic Force Of The Linear Generator In Point Absorber Wave Energy Converters, Zhong-Qiang Zheng, Peng Huang, Da-Xiao Gao, Zong-Yu Chang Aug 2015

Analysis Of Electromagnetic Force Of The Linear Generator In Point Absorber Wave Energy Converters, Zhong-Qiang Zheng, Peng Huang, Da-Xiao Gao, Zong-Yu Chang

Journal of Marine Science and Technology–Taiwan

In recent decades energy shortage and environmental pollution have increasingly become challenges faced by the world. New innovation technology to harness renewable energy such as wave energy is considered to be the key to solve this problem. Point absorber wave energy converter (WEC) is one of the most effective means to utilize wave energy. Several different types of power take off (PTO) devices have been used in the design of point absorber WEC amongst which linear generator has the advantages of direct drive, structural simplicity, high-efficiency and so on. This paper studies the electromagnetic force of the linear generator, and …

Go to article

Stability Investigation Damaged Ships, Rodrigo Pérez Fernández Aug 2015

Stability Investigation Damaged Ships, Rodrigo Pérez Fernández

Journal of Marine Science and Technology–Taiwan

There are many areas in which naval vessels could improve safety standards, although naval vessels are not necessarily regarded as less secure than the civil vessels. Although the navies never have considered water on deck a problem, it seems that this problem has a critical value in the ship damage stability analysis. As an example, this damage should be investigated if the ship has a low freeboard. For this research various studies and calculations have been carried out on several designed test vessels. It is possible to decide which criteria to use in terms of damages for each type of …

Go to article

Study Of Different Denoising Methods For Underwater Acoustic Signal, V. Vijaya Baskar, V. Rajendran, E. Logashanmugam Aug 2015

Study Of Different Denoising Methods For Underwater Acoustic Signal, V. Vijaya Baskar, V. Rajendran, E. Logashanmugam

Journal of Marine Science and Technology–Taiwan

Marine Engineering faces certain challenges in recent times due to the prevalence of ambient conditions caused by imbalance in the ecosystem. Underwater ambient noise is primarily a background noise, which is a function of time, location and depth. It is of prime importance to detect the signals such as the sound of a submarine or an echo from a target, surpassing and surmounting this ambient noise. In the absence of the sound from ships and marine life, underwater ambient noise levels are dependent mainly on wind speeds at frequencies between 500 Hz and 50 KHz (Urick, 1984). Since there is …

Go to article

Shear Strength Of Reinforced Concrete Dapped-End Beams With Shear Span-To-Depth Ratios Larger Than Unity, Wen-Yao Lu, Ting-Chou Chen, Ing-Jaung Lin Aug 2015

Shear Strength Of Reinforced Concrete Dapped-End Beams With Shear Span-To-Depth Ratios Larger Than Unity, Wen-Yao Lu, Ting-Chou Chen, Ing-Jaung Lin

Journal of Marine Science and Technology–Taiwan

Test results of 24 reinforced concrete dapped-end beams with shear span-to-depth ratios larger than unity are reported. The main variables studied were compressive strength of concrete, shear span-to-depth ratio, and main reinforcement and vertical stirrups of dapped-end beams. The test results indicate that the dapped-end beams all failed by flexure. The shear strength of dapped-end beams increases with increase in compressive strength of concrete. With smaller shear span-todepth ratio, the dapped-end beams show greater stiffness and ultimate load. The shear strength predicted by the proposed model, the strut-and-tie model of the ACI Code, and the approach of the PCI Design …

Go to article

Influence Of Raisin Starter Syrup Concentrations On The Properties Of Sourdough And Sourdough Bread, Jean-Yu Hwang, Yung-Shin Shyu Aug 2015

Influence Of Raisin Starter Syrup Concentrations On The Properties Of Sourdough And Sourdough Bread, Jean-Yu Hwang, Yung-Shin Shyu

Journal of Marine Science and Technology–Taiwan

The present study evaluates the effects of syrup concentrations of natural raisin microflora culture on the characteristics of sourdough and sourdough bread. The original total titratable acidity (TTA) of the starter solutions were between 10.30 and 10.45 mL, after 96 hours of incubation, the TTA of the starter solution increased to 11.30-11.85 mL. The greatest pH decrease and TTA increase occurred in the RS50 group. The microstructure of the control bread was rougher and contained more ungelatinized starch particles than bread made with sourdough. The overall acceptability and flavor of bread made using sourdough with the 150 g/L syrup solution …

Go to article

Describing Landscape Structure Improvement According To Experimental Results, Fu-Ming Chang, Ning-Chien Tung Aug 2015

Describing Landscape Structure Improvement According To Experimental Results, Fu-Ming Chang, Ning-Chien Tung

Journal of Marine Science and Technology–Taiwan

This study investigated silt movement and the influence of fine sand on downstream ecology during movement by using a small indoor physical model for simulating onsite conditions. The obtained data were analyzed to determine the impact of silt on ecological habitats and can serve as a reference for future onsite and ecology investigations. Before a dam was removed to allow a downstream riverway to restore the initial environment, the riverway stabilized at approximately 960 s, and the dam was removed at approximately 1140 s. After the dam was removed, the silt in each channel section evidently increased, and after a …

Go to article

Composite Coastal Protection Methods Used At Cijin Coast, Taiwan, Hong-Mo Wu, Shao-Gu Kuo, Yen-Ting Lai, Li-An Kuo, Chia-Yan Cheng, Jyh-Cheng Chu, Yang-Yih Chen, John R. C. Hsu Aug 2015

Composite Coastal Protection Methods Used At Cijin Coast, Taiwan, Hong-Mo Wu, Shao-Gu Kuo, Yen-Ting Lai, Li-An Kuo, Chia-Yan Cheng, Jyh-Cheng Chu, Yang-Yih Chen, John R. C. Hsu

Journal of Marine Science and Technology–Taiwan

Cijin Coast has suffered from severe beach erosion and a consequent coastline retreat. To analyze the trend of topographic evolution of Cijin Coast, bathymetric data from field investigation were used and both numerical simulation and physical modeling were implemented in the wave basin to obtain the corresponding parameters that replicate similar phenomena. To protect Cijin Coast, composite coastal protection methods, such as submerged detached breakwaters accompanied with artificial nourishments, were proposed. Parameters used in previous studies were employed to test the proposed protection methods, and the results showed that the methods were effective in preventing the consequent retreat of the …

Go to article

Improving Detection Technique For Flight Recorders Of The Distress Airplanes Crashed Into Ocean By Integrating Inertial Navigation System Into Underwater Locator Beacon, Sheng-Shih Wang, Hsien-Sen Hung, Jyh-Jier Ho, Jie-Xian Lin, Chi-Hsiao Yeh Aug 2015

Improving Detection Technique For Flight Recorders Of The Distress Airplanes Crashed Into Ocean By Integrating Inertial Navigation System Into Underwater Locator Beacon, Sheng-Shih Wang, Hsien-Sen Hung, Jyh-Jier Ho, Jie-Xian Lin, Chi-Hsiao Yeh

Journal of Marine Science and Technology–Taiwan

Flight recorder, used to analyze distress reasons, is equipped with underwater locator beacon (ULB) for being detected and recovered easily in sea. According to the recovery report for the Air France flight no. AF447 distress airplane, it nearly took two years and cost 40 million US dollars to search and recover the flight recorders. Apparently, future aviation safety could be greatly improved if earlier recovery of the flight recorders would reveal the crash reasons sooner. Therefore, this paper is aimed to develop an enhanced ULB, which integrates inexpensive inertial navigation system (INS) into ULB, for a cost-effective and time-saving operation …

Go to article

Effects Of Generator Parameters And Transformer Disposal On Dynamics Of A High-Penetration No-Storage Wind-Diesel System, Chi-Hsiang Lin Aug 2015

Effects Of Generator Parameters And Transformer Disposal On Dynamics Of A High-Penetration No-Storage Wind-Diesel System, Chi-Hsiang Lin

Journal of Marine Science and Technology–Taiwan

In this paper, dynamics of a high-penetration, no-storage wind-diesel (HPNSWD) system subjected to line faults are studied. It is found that the effect of induction generator electrical parameters on generator electromagnetic torque, system frequency and generator terminal voltage is significant, especially for the rotor resistance, which is able to significantly affect all the three target performances. Therefore, it will be the most effective way to improve the system dynamics by controlling the rotor resistance. It is also found that the system dynamics would be significantly improved by disposing a distribution transformer. However, the effectiveness depends on the installation position. A …

Go to article

Coupling Vof/Plic And Embedding Method For Simulating Wave Breaking On A Sloping Beach, Tai-Wen Hsu, Chih-Min Hsieh, Chin-Yen Tsai, Shan-Hwei Ou Aug 2015

Coupling Vof/Plic And Embedding Method For Simulating Wave Breaking On A Sloping Beach, Tai-Wen Hsu, Chih-Min Hsieh, Chin-Yen Tsai, Shan-Hwei Ou

Journal of Marine Science and Technology–Taiwan

A 2-D numerical model was developed to simulate wave breaking on a sloping beach. The model solves the Reynolds Averaged Navier-Stokes (RANS) equations coupled with the k-ε turbulence closure model. To track free surface configurations, the volume of fluid with piecewise linear interface calculation (VOF/PLIC) is employed. An embedding method (EB) is also used to treat complex bottom topography. Coupling these two methods for simulating wave breaking on a sloping beach, good agreement between numerical results and laboratory observations is found for spilling breaker. Wave breaking characteristics is in terms of free surface profiles, mean velocities and wave heights based …

Go to article

Elastohydrodynamic Lubrication Of Circular Contacts At Pure Squeeze Motion Involving The Mixture Of Two Lubricants, Li-Ming Chu, Yuh-Ping Chang, Jer-Jia Sheu Aug 2015

Elastohydrodynamic Lubrication Of Circular Contacts At Pure Squeeze Motion Involving The Mixture Of Two Lubricants, Li-Ming Chu, Yuh-Ping Chang, Jer-Jia Sheu

Journal of Marine Science and Technology–Taiwan

This study investigated the pure squeeze elastohydrodynamic lubrication (EHL) motion of circular contacts by using mixed rheology fluid models under constant load conditions. The lubricant was a homogeneous mixture of a Newtonian base oil and couple stress fluid at various volume fractions. The simulation results revealed that the effect of the couple stress fluid was equivalent to enhancing the viscosity of the lubricant. Therefore, the central film thickness and minimum film thickness increased with the volume fraction of the couple stress fluid (ν). The central pressure decreased as ν increased. In addition, the normal squeeze velocity followed the ensuing order: …

Go to article

The New Method To Evaluate The Uplift Capacity Of Belled Piles In Sandy Soil, Jaw-Guei Lin, Shih-Yu Hsu, San-Shyan Lin Aug 2015

The New Method To Evaluate The Uplift Capacity Of Belled Piles In Sandy Soil, Jaw-Guei Lin, Shih-Yu Hsu, San-Shyan Lin

Journal of Marine Science and Technology–Taiwan

In conventional geotechnical engineering, the pull out of pile is always blamed only on the shear failure of the soil caused by the uplift force developed from the tip of the pile. For the belled pile, however, the enlarged foundation plays an important role to against the compression/uplift load, and the current theories for estimating the uplift capacities of the pile were found more than 50% relative error from measured. In this study, a new method for estimating the ultimate uplift capacity of the belled pile embedded in sandy soil was developed by taking into account the elastic/plastic behavior of …

Go to article

The Kriging Cloud Computing Framework: Interpolation Of Topography By Cloud Computing With The Kriging Algorithm, Cheng-Tsan Lai, Sung-Shan Hsiao, Hui-Ming Fang, Edward H. Wang Aug 2015

The Kriging Cloud Computing Framework: Interpolation Of Topography By Cloud Computing With The Kriging Algorithm, Cheng-Tsan Lai, Sung-Shan Hsiao, Hui-Ming Fang, Edward H. Wang

Journal of Marine Science and Technology–Taiwan

Spatial information surveyed by photogrammetry, airborne LiDAR and Mobile Measurement System (MMS) above ground level can be analyzed by scientists using standard geostatistical methodologies such as ordinary Kriging and sequential Gaussian simulation to interpolate heterogeneities of profiles from sparse sample data. Proven effective by researchers, the Kriging algorithm model is used by commercial data analysis packages for instant interpolation. However, meaningful and reliable results only come with a comprehensive understanding of the variogram associated with valid mathematical functions. To capture spatial landscape variations from massive sample grids of satellite images, this paper presents a cloud computing-based automation approach to improve …

Go to article

Effects Of Battery Energy Storage System On The Operating Schedule Of A Renewable Energy Based Tou Rate Industrial User Under Competitive Environment, Chun-Lung Chen, Yu-Liang Lin, Wen-Yu Fu Aug 2015

Effects Of Battery Energy Storage System On The Operating Schedule Of A Renewable Energy Based Tou Rate Industrial User Under Competitive Environment, Chun-Lung Chen, Yu-Liang Lin, Wen-Yu Fu

Journal of Marine Science and Technology–Taiwan

With increasing development of smart grid and restructuring of the power industry, the problem of operating schedule for a time-of-use (TOU) rate industrial customer may become a more important issue due to the inclusion of the variations in the TOU rate structures. This paper develops a new algorithm, named intelligent particle swarm optimization (INPSO), to solve the operating schedule of a renewable energy based TOU rate industrial user with battery energy storage system (BESS). Adding another particle best (Pbestap) item with a diversity based judgment mechanism, proposed INPSO algorithm can give a good direction to enhance its search capacity that …

Go to article

Unraveling The Formation Of Continental Crust : A Review And Outlook, Eason Hong, Wei-Ting Kao Aug 2015

Unraveling The Formation Of Continental Crust : A Review And Outlook, Eason Hong, Wei-Ting Kao

Journal of Marine Science and Technology–Taiwan

The early Earth is generally believed to be a hot planet with a primitive basaltic oceanic crust. However, the question of how a batholiths-bearing continent was formed is still unresolved. Although many hypothetical interpretations seem appealing, the origin and volume dilemma of the batholiths is still under debate. According to recent literature, the Hadean Ocean is characterized by heat, acidity and reduction, significantly unlike its counterparts in Earth's history. We have found that this crucial marine setting, favoring the chemical weathering of basaltic rocks, is the key element for forming and stabilizing the primitive continents through convergent tectonics and the …

Go to article

Effects Of Various Extrapolation Techniques For Abbreviated Dynamic Modulus Test Data On The Mepdg Rutting Predictions, Minkyum Kim, Louay N. Mohammad, Mostafa A. Elseifi Jun 2015

Effects Of Various Extrapolation Techniques For Abbreviated Dynamic Modulus Test Data On The Mepdg Rutting Predictions, Minkyum Kim, Louay N. Mohammad, Mostafa A. Elseifi

Journal of Marine Science and Technology–Taiwan

Abbreviated dynamic modulus test protocols have been used to reduce the time and cost of running the test for routine uses. The abbreviated test results can then be extrapolated to estimate the complete array of the dynamic modulus values required for the Level 1 MEPDG analysis. Multiple approaches are available for the extrapolation depending on a master curve and shift factor functions chosen. The objective of this study was to identify the best practice of extrapolating the abbreviated dynamic modulus data by evaluating the accuracy of performance predictions through MEPDG pavement analysis. Two common sigmoid functional forms (i.e., the MEPDG …

Go to article

Combined Effects Of Temperature And Moisture Content On Soil Suction Of Compacted Bentonite, Shu-Rong Yang, Wei-Hsing Huang, Shao-Hung Chung Jun 2015

Combined Effects Of Temperature And Moisture Content On Soil Suction Of Compacted Bentonite, Shu-Rong Yang, Wei-Hsing Huang, Shao-Hung Chung

Journal of Marine Science and Technology–Taiwan

Based on experimental determination of soil suctions of two clayey soils, this study investigated the combined effects of temperature and moisture content on soil suction. First, two clayey soils were statically compacted at target moisture contents ranging from 5% to 20%, such that a broad spectrum of compaction conditions can be evaluated. Then, filter paper method and thermocouple psychrometer were adopted to measure soil suction, including total and matric suctions, at temperatures ranging from 10°C to 60°C. It was found that soil suctions of expansive soils vary with compaction parameters such as compaction moisture content and compaction effort, and that …

Go to article

Preliminary Study On The Correlation Between Two-Dimension Surface Texture And Friction, Shih-Huang Chen, Kuan-Lun Hsu, Pei Liu, Hung-Wen Chung Jun 2015

Preliminary Study On The Correlation Between Two-Dimension Surface Texture And Friction, Shih-Huang Chen, Kuan-Lun Hsu, Pei Liu, Hung-Wen Chung

Journal of Marine Science and Technology–Taiwan

The friction of pavement is mainly determined by the microtexture of the surface layer. However, the finer degree of microtexture makes it impossible to observe with naked eye. The object of this study was to develop a High Definition Scan Texture Machine (HDSTM) with 2D Laser CCD to support previous research on the correlation between texture and friction. In addition, this study proposed seven different parameters and sought to find an index for an ideal correlation that could represent the entire pavement texture. By assessing the test results, the Segment of Average Profile Depth (SAPD) was selected as the texture …

Go to article

The Feasibility Of Using Washed Municipal Solid Waste Incinerator Bottom Ash In Compressed Mortar Paving Units, Wen-Ten Kuo, Chih-Chien Liu, Chun-Ya Shu Jun 2015

The Feasibility Of Using Washed Municipal Solid Waste Incinerator Bottom Ash In Compressed Mortar Paving Units, Wen-Ten Kuo, Chih-Chien Liu, Chun-Ya Shu

Journal of Marine Science and Technology–Taiwan

This study replaced natural fine aggregate with a fine aggregate of washed municipal solid waste incinerator bottom ash (WMSWIBS) in the production of compressed mortar paving units to explore the feasibility of using WMSWIBS in this application. Cement-aggregate ratios (c/a) of 0.1, 0.2, 0.3, 0.4, and 0.5 and water-cement ratios (w/c) of 0.20, 0.25, and 0.30 were selected. The results yielded a specific gravity of 2.21, aggregate absorption of 9.6%, and a fineness modulus of 3.2. The WMSWIBS's toxicity characteristic leaching procedure (TCLP) values were much lower than the limit specified by the Environmental Protection Administration (EPA, Taiwan), and its …

Go to article

Assessment Of Rut Depth Measurement Accuracy Of Point-Based Rut Bar Systems Using Emerging 3d Line Laser Imaging Technology, Yichang (James) Tsai, Zhaohua Wang, Feng Li Jun 2015

Assessment Of Rut Depth Measurement Accuracy Of Point-Based Rut Bar Systems Using Emerging 3d Line Laser Imaging Technology, Yichang (James) Tsai, Zhaohua Wang, Feng Li

Journal of Marine Science and Technology–Taiwan

Point-based rut bar systems are commonly used by transportation agencies. However, potential measurement errors exist in these systems because of the limited number of sample points (e.g. 3 to 31 points). Now, advanced sensing technology can acquire high-resolution transverse profiles of more than 4,000 points using 3D line laser imaging technology (termed the 3D line laser hereafter). This study, sponsored by the United States Department of Transportation (USDOT) Research and Innovative Technology Administration (RITA) program, is a) to explore the feasibility of using the 3D line laser to accurately and reliably measure rut depth, and b) to quantify the potential …

Go to article

Application Of A Decision Tree Method With A Spatiotemporal Object Database For Pavement Maintenance And Management, Chien-Ta Chen, Chia-Tse Hung, Jyh-Dong Lin, Po-Hsun Sung Jun 2015

Application Of A Decision Tree Method With A Spatiotemporal Object Database For Pavement Maintenance And Management, Chien-Ta Chen, Chia-Tse Hung, Jyh-Dong Lin, Po-Hsun Sung

Journal of Marine Science and Technology–Taiwan

In recent years, pavement engineering has gradually shifted from new construction work to pavement maintenance and management. Since pavement engineers of the Taipei City Government change frequently, objective data is used to make decisions pertaining to road maintenance in Taipei City instead of relying on engineers' experience. In this study, three methods (ID3, C5.0 and SVM) have been chosen to test for use in the decision-making process related to road maintenance of Taipei City. The results show the correct classification rates of the decision trees are 76.67% (C5.0), 64.52% (ID3), and 66.67% (SVM). The decision tree of C5.0 was compared …

Go to article

The In-Situ Temperature Evaluations Of Permeable Pavements In Summer, Chen-Yu Hsu, Shih-Huang Chen, Jyh-Dong Lin Jun 2015

The In-Situ Temperature Evaluations Of Permeable Pavements In Summer, Chen-Yu Hsu, Shih-Huang Chen, Jyh-Dong Lin

Journal of Marine Science and Technology–Taiwan

In this paper, one traditional asphalt and three permeable pavements were constructed to evaluate the thermal characteristics of pavement temperature at different depths and heat output in the field. The data were collected from May to July, 2011 to analyze with six traditional Chinese summer solar terms. On July 23, 2011 or Ta-Shu (great heat), it was the hottest day among six summer solar terms, while peak temperature of asphalt pavements was more than 60°C and ambient temperature was 36°C occurring at 14:00. In addition, it was found that reflectivity was affected by the color of pavement materials, and the …

Go to article

Innovative Asphalt Research Using Accelerated Pavement Testing, Manfred N. Partl, Christiane Raab, Martin Arraigada Jun 2015

Innovative Asphalt Research Using Accelerated Pavement Testing, Manfred N. Partl, Christiane Raab, Martin Arraigada

Journal of Marine Science and Technology–Taiwan

Accelerated pavement testing is one key for innovations in the field of road pavement structures and materials due to its power of assessing mechanical performance in close to reality situations. This paper discusses two types of mobile load simulators for applying unidirectional wheel loads at comparatively high frequencies, the MMLS3, a one third scale device, and the MLS10, a full-scale device. Through examples it is demonstrated that these devices are suitable for testing complex systems, such as mechanical resistance of light reflectors on pavements, traffic resistance of bituminous plug expansion joints for bridges, performance of grid reinforced pavements as well …

Go to article

Assessment Of Asphalt Concrete Pavement Quality By Using Infrared Thermal Imaging Technology, Lisa Y. Chen, Mei-Yun Wang, Chien-Chiao Chao, Wei Lo Jun 2015

Assessment Of Asphalt Concrete Pavement Quality By Using Infrared Thermal Imaging Technology, Lisa Y. Chen, Mei-Yun Wang, Chien-Chiao Chao, Wei Lo

Journal of Marine Science and Technology–Taiwan

Manholes cause uneven pavements, which affect the quality of pavement services, leading to public criticism in Taiwan. Many manholes are buried beneath pavements to ensure evenness and enhance the usability of pavements for pedestrians. The presence of manholes affects the quality of the asphalt concrete underneath the pavement because then conducting excavations using road construction equipment becomes difficult, ultimately leading to early deterioration of the pavement surfaces. Temperatures can also differ considerably between the manhole and non-manhole locations on asphalt concrete pavement. This study used infrared thermal imaging technology and an analysis of variances statistical method to investigate the differences …

Go to article

Regression Modeling Of Resilient Modulus Of Unbound Aggregates, Zahid Hossain, Musharraf Zaman, Curtis Doiron Jun 2015

Regression Modeling Of Resilient Modulus Of Unbound Aggregates, Zahid Hossain, Musharraf Zaman, Curtis Doiron

Journal of Marine Science and Technology–Taiwan

Resilient response of granular aggregate is a key input parameter in all three hierarchical levels of the new MechanisticEmpirical pavement Design Guide (MEPDG), which requires a comprehensive evaluation of resilient modulus (Mr) database(s) for local conditions. To this end, Mr data and other routine properties (gradation, LA Abrasion loss, standard Proctor, and unconfined compressive strength (UCS)) of 105 samples of two different types of aggregate (limestone and sandstone) were analyzed in this study. A total of four stressbased regression models were evaluated using a statistical software package (“SPSS”, Version 17), and material constants (k1, k2, and k3) for these aggregates …

Go to article

Evaluation Of Steel Bridge Deck Ma Mixture Properties During Construction, Zou Guilian, Zhang Xiaoning, Chung Wu Jun 2015

Evaluation Of Steel Bridge Deck Ma Mixture Properties During Construction, Zou Guilian, Zhang Xiaoning, Chung Wu

Journal of Marine Science and Technology–Taiwan

Responses of steel bridge deck pavement to environmental and traffic loadings are much different from those of normal highway asphalt concrete pavement or concrete bridge deck. Steel bridge deck pavement generally deals with more challenging conditions, especially orthotropic steel bridges (Seim and Ingham, 2004; Medani et al., 2007; Battista et al., 2008; Cong et al., 2009; Kashefi et al., 2010). Therefore, materials used in constructing the steel deck bridges must possess excellent properties. Guss Asphalt (GA) and Mastic Asphalt (MA) are two types of asphalt concrete primarily used in steel deck bridge pavement construction (Eulitz et al., 2004; Ripke, 2009; …

Go to article

The Application Of Hierarchical Linear Modeling For Barrier-Free Sidewalk Evaluation With The Basis Of Disability Organization Cognitive, Ching Tsung Hung Jun 2015

The Application Of Hierarchical Linear Modeling For Barrier-Free Sidewalk Evaluation With The Basis Of Disability Organization Cognitive, Ching Tsung Hung

Journal of Marine Science and Technology–Taiwan

Organizations are hierarchical in nature. Specifically, individuals in the workplace are entrenched in work groups, which are entrenched in departments, which are entrenched in organizations, which are in turn entrenched in the larger environment. Hence, hierarchical linear modeling (HLM) is a statistical technique available to researchers that is ideally suited for the study of such cross-level issues. The purpose of this article is to provide market researchers with an overview and detailed description of HLM as well as a practical illustration of its usage. The long-term aim of the Americans with Disabilities Act (ADA) is for publicly available services along …

Go to article

An Idealized Discrete Element Model For Pavement-Wheel Interaction, Yu Liu, Zhanping You, Hui Yao Jun 2015

An Idealized Discrete Element Model For Pavement-Wheel Interaction, Yu Liu, Zhanping You, Hui Yao

Journal of Marine Science and Technology–Taiwan

In order to design a longer-lasting pavement, it is important for pavement designers to understand the mechanism of the vehicular loading. The main objective of this paper is to present an idealized discrete element modeling of pavementwheel interaction for better understanding traffic loading conditions. The idealized model consists of three parts: a smooth surface, a wheel, and a mass. The smooth surface simulates the pavement surface, while the wheel and mass represent a vehicle wheel and its corresponding mass, respectively. The mechanical behaviors at the interaction surface are simulated through an elastic contact model, a slip model, and a viscous …

Go to article

First Prev Next Last