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2008

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Articles 61 - 90 of 997

Full-Text Articles in Civil and Environmental Engineering

Integrating Surface And Sub Surface Flow Models Of Different Spatial And Temporal Scales Using Potential Coupling Interfaces, Alphonce Chenjerayi Guzha Dec 2008

Integrating Surface And Sub Surface Flow Models Of Different Spatial And Temporal Scales Using Potential Coupling Interfaces, Alphonce Chenjerayi Guzha

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The main objective of this research was to develop and utilize a coupled surface water groundwater model to simulate hydrological responses of watersheds. This was achieved by coupling the U.S. Geological Survey (USGS) groundwater flow model, MODFLOW, and the rainfall runoff model, TOPMODEL, in one case study and coupling MODFLOW with a networked version of TOPMODEL called TOPNET in another case study. The model coupling was achieved using the InCouple approach, which utilizes Potential Coupling Interfaces (PCIs) that are abstractions from model flow diagrams that expose only those aspects of a model relevant to coupling. Coupling the rainfall-runoff models to …

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Safety And Operational Impacts Of Alternative Intersections, Andrew P. Tarko, Mike Inerowicz, Brandon Lang Dec 2008

Safety And Operational Impacts Of Alternative Intersections, Andrew P. Tarko, Mike Inerowicz, Brandon Lang

JTRP Technical Reports

As the degradation of service at some conventional intersections increases, there becomes a need for alternative solutions other than expensive interchanges. Many alternative intersections have been proposed in the past. Under certain traffic and local conditions some solutions are more promising than other. In some cases, the conventional intersection may still be the optimal choice. The presented research focused on developing guidelines that would help planners and designers identify the most promising solutions for further analysis. This objective has been addresses in two ways. Firstly, the existing knowledge on alternative intersections has been identified. Secondly, the performance of conventional and …

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Optimal Maintenance Crew Composition And Enhancement Of Crew Productivity, Robert Schober Dec 2008

Optimal Maintenance Crew Composition And Enhancement Of Crew Productivity, Robert Schober

All Theses

The South Carolina Department of Transportation (SCDOT) dedicates a large portion of its budget and other resources to the maintenance of the State's transportation infrastructure. In order to maximize the efficiency and productivity of the State's highway maintenance workforce, the SCDOT partnered with Clemson University to research the performance of these maintenance crews. The goal of this research is to identify optimal crew compositions, if possible, and to suggest potential crew productivity enhancement methods.
Data was collected from the SCDOT Highway Maintenance Management System (HMMS) and crew rankings were developed based on several pre-determined performance criteria. These rankings were then …

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Incorporating Spatial Data And Gis To Improve Sea Of Land Use Plans: Opportunities And Limitations: Case Studies In The Republic Of Ireland, Ainhoa Gonzalez Del Campo Nov 2008

Incorporating Spatial Data And Gis To Improve Sea Of Land Use Plans: Opportunities And Limitations: Case Studies In The Republic Of Ireland, Ainhoa Gonzalez Del Campo

Doctoral

This research aimed at establishing whether spatial data and Geographic Information Systems (GIS) can contribute to Strategic Environmental Assessment (SEA). To achieve this, an integrated GISEA approach was developed and applied to a number of spatial planning SEAs in the Republic of Ireland. The practical applicability of the approach was examined, evaluating the potential benefits derived from using spatial data and GIS in SEA and assessing the potential barriers to an effective GIS use. The implementation of the SEA Directive incorporated a new dimension into plan-making by calling for the assessment of potential environmental effects that may derive from implementing …

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Crashes In The Vicinity Of Major Crossroads, Charles G. Allen Nov 2008

Crashes In The Vicinity Of Major Crossroads, Charles G. Allen

Theses and Dissertations

Major crossroads are designed to facilitate the conflicting movements of numerous vehicles in a manner that is both safe and efficient. Accesses located within the functional areas of major crossroads add complication to intersection activity due to additional conflicts arising from ingressing and egressing movements at the accesses. In this research, the impact of accesses on crashes within major crossroad functional areas was analyzed. Specifically, the effects of access spacing within functional areas and access setback from intersections were addressed. In order to conduct the analysis, the functional areas of 159 signalized major arterial crossroads across the state of Utah …

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Foundational Data Repository For Numeric Engine Validation, Jason Michael Hollingsworth Nov 2008

Foundational Data Repository For Numeric Engine Validation, Jason Michael Hollingsworth

Theses and Dissertations

Many different numeric models have been created to address a variety of hydraulic and hydrologic engineering applications. Each utilizes formulations and numeric methods to represent processes such as contaminant transport, coastal circulation, and watershed runoff. Although one process may be adequately represented by a model, this does not guarantee that another process will be represented even if that process is similar. For example, a model that computes subcritical flow does not necessarily compute supercritical flow. Selecting an appropriate numeric model for a situation is a prerequisite to obtaining accurate results. Current policies and resources do not provide adequate guidance in …

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Effect Of Initial Scarification And Overlay Treatment Timing On Chloride Concentrations In Concrete Bridge Decks, Curtis Daniel Nolan Nov 2008

Effect Of Initial Scarification And Overlay Treatment Timing On Chloride Concentrations In Concrete Bridge Decks, Curtis Daniel Nolan

Theses and Dissertations

Considering the pervasive presence of chlorides in concrete bridge decks, bridge engineers have a critical responsibility to perform proper and effective preventive maintenance and rehabilitation operations. Bridge engineers often perform scarification and overlay (SO) procedures on concrete bridge decks to minimize the corrosion of reinforcing steel due to chloride ingress. Given the need to develop guidelines for the initial timing of SO treatments, the specific objectives of this research were to collect information from several department of transportation (DOT) personnel about their SO procedures and, subsequently, to determine the recommended timing of initial SO procedures on concrete bridge decks for …

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Empirical Two-Point Α-Mixing Model For Calibrating The Ech2o Ec-5 Soil Moisture Sensor In Sands, Toshihiro Sakaki, Anuchit Limsuwat, Kathleen M. Smits, Tissa H. Illangasekare Nov 2008

Empirical Two-Point Α-Mixing Model For Calibrating The Ech2o Ec-5 Soil Moisture Sensor In Sands, Toshihiro Sakaki, Anuchit Limsuwat, Kathleen M. Smits, Tissa H. Illangasekare

Civil Engineering Faculty Publications - Archive

Recently improved ECH2O soil moisture sensors have received significant attention in many field and laboratory applications. Focusing on the EC-5 sensor, a simple and robust calibration method is proposed. The sensor-to-sensor variability in the readings (analog-to-digital converter (ADC) counts) among 30 EC-5 sensors was relatively small but not negligible. A large number of ADC counts were taken under various volumetric water contents (?) using four test sands. The proposed two-point a-mixing model, as well as linear and quadratic models, was fitted to the ADC – ? data. Unlike for conventional TDR measurements, the effect of sensor characteristics is lumped into …

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Median Crossover Crashes In The Vicinity Of Interchanges On Utah Interstates, Katherine Elaine Winters Nov 2008

Median Crossover Crashes In The Vicinity Of Interchanges On Utah Interstates, Katherine Elaine Winters

Theses and Dissertations

While not accounting for a significant proportion of overall crashes, median crossover crashes in the state of Utah do account for a significant proportion of interstate fatalities. Due to the seriousness of median crossover crashes in the state of Utah, the need exists to evaluate the impact of median crossover crashes in the state, to identify locations where median crossover crashes may be occurring at particularly high rates, and to identify methods to help mitigate these crashes. Previous research has noted that median crossover crash rates appear to increase in the vicinity of interchanges. The purpose of this research, therefore, …

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Isolation Of Methyl Laurate From Coconut Oil As Raw Material For Fatty Alcohol Sulfate, Rita Arbianti, Tania Surya Utami, Astri Nugroho Nov 2008

Isolation Of Methyl Laurate From Coconut Oil As Raw Material For Fatty Alcohol Sulfate, Rita Arbianti, Tania Surya Utami, Astri Nugroho

Makara Journal of Technology

Isolation of Methyl Laurate from Coconut Oil as Raw Material for Fatty Alcohol Sulfate. Methyl laurate is a raw or base material for many industries, including surfactant industries. In this research, coconut oil (VCO) is transesterified with methanol to produce methyl ester, using NaOH as the catalyst. Methyl laurate is then separated by method based on the difference in melting point. This research focuses at determining the effects of some variables in transesterification on the concentration of produced methyl laurate. The variables are temperature (40 oC, 50 oC, 60 oC, 80 oC), time of transesterification reaction (0,5 hour, 1 hour, …

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The Decompositioning Of Volatile-Matter Of Tanjung Enim Coal By Using Thermogravimetry Analyzer (Tga), Nukman Nukman Nov 2008

The Decompositioning Of Volatile-Matter Of Tanjung Enim Coal By Using Thermogravimetry Analyzer (Tga), Nukman Nukman

Makara Journal of Technology

The Decompositioning of Volatile-Matter of Tanjung Enim Coal by using Thermogravimetry Analyzer (TGA). Coal is a nature material which a kind of energy source. The decompotition of coal could analyze by heat treated using thermogravimetry analyzer. The decomposition of the volatile matter for three kinds of Tanjung Enim coal could be known. The value of activation energy that be found diference, then for Semi Anthracite, Bitumonius and Sub Bituminous Coal, the initial temperatures are 60.8 oC, 70.7 oC, 97.8oC, and the last temperatures are 893.8 oC, 832 oC, 584.6oC.

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Phase Unwrapping Insar Image Using Local Energy Minimization Approach, Kusworo Adi, Tati L.R. Mengko, Andriyan B. Suksmono, Hendra Gunawan Nov 2008

Phase Unwrapping Insar Image Using Local Energy Minimization Approach, Kusworo Adi, Tati L.R. Mengko, Andriyan B. Suksmono, Hendra Gunawan

Makara Journal of Technology

Phase Unwrapping InSAR Image Using Local Energy Minimization Approach. Reconstruction process of phase data from its cover is called Phase Unwrapping (PU). Ideally, without any noise phrase, singularity, and aliasing problems, the phase information can be unwrapped easily. However, in fact, the phase data actually always get noise disturbance and discontinuity. The PU process becomes more complicated and needs a better PU algorithm to address the problems properly. In this research, the local PU algorithm is developed using minimization of close related firstorder pixels energy approach. In this method, the energy difference between four close related pixels is counted, followed …

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Two Element Microstrip Antenna Array With Defected Ground Structure, Fitri Yuli Zulkifli, Eko Tjipto Rahardjo, Muhamad Asvial, Djoko Hartanto Nov 2008

Two Element Microstrip Antenna Array With Defected Ground Structure, Fitri Yuli Zulkifli, Eko Tjipto Rahardjo, Muhamad Asvial, Djoko Hartanto

Makara Journal of Technology

Two Element Microstrip Antenna Array with Defected Ground Structure. This paper presents a two element microstrip antenna array using trapezium shape defected ground structure (DGS). The DGS is inserted in the ground plane between two elements of antenna array. Insertion of the DGS is intended to suppress the mutual coupling effect produced by antenna array. Simulation and measurement results were taken and compared between antenna array with and without DGS. Measurement results show that the antenna with DGS compared to antenna without DGS can suppress mutual coupling effect to 7.9 dB, improve the return loss to 33.29% from -30.188 dB …

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Neutron Irradiation On Ss316 Material For Radioactive Endovascular Stent Production, Rohadi Awaludin, Abidin Abidin, Sriyono Sriyono Nov 2008

Neutron Irradiation On Ss316 Material For Radioactive Endovascular Stent Production, Rohadi Awaludin, Abidin Abidin, Sriyono Sriyono

Makara Journal of Technology

Neutron Irradiation on SS316 Material for Radioactive Endovascular Stent Production. It was reported that restenosis could be prevented by radioactive endovascular stent. SS316 material of endovascular stent has been irradiated at pneumatic rabbit system of G.A. Siwabessy reactor for 5 minutes for producing radioactive stent by neutron activation. After 10 days of decay, the irradiated SS316 was measured by gamma spectrometer. The radioisotopes of 51Cr, 59Fe and 60Co were detected in the irradiated SS316 with radioactivity of 5990, 107 and 109 Bq/mg respectively. The Calculation results showed that radioisotopes of 51Cr, 59Fe and 55Fe were produced by neutron activation. The …

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Physical Characteristics And Utilization Oft The Karst Beaches In Kabupaten Gunungkidul, Astrid Damayanti, Ranum Ayuningtyas Nov 2008

Physical Characteristics And Utilization Oft The Karst Beaches In Kabupaten Gunungkidul, Astrid Damayanti, Ranum Ayuningtyas

Makara Journal of Technology

Physical Characteristics and Utilization oft the Karst Beaches in Kabupaten Gunungkidul. Karsts beaches at Gunungkidul Regency (Baron, Kukup, Sepanjang, Drini, Krakal, Ngandong, and Sundak), located in south of Daerah Istimewa Yogyakarta Province, have economic potential. Even they have similarity in geological condition (genesis and morphological processes), but they have different physical characteristics. Based on result of observation environment on morphological conditions and spatial analysis method, we found the proper utilization of the beaches.

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Hydrogen Absorption In Weldments Of Overlaid Claded Pressure Vessel, Ronnie Higuchi Rusli Nov 2008

Hydrogen Absorption In Weldments Of Overlaid Claded Pressure Vessel, Ronnie Higuchi Rusli

Makara Journal of Technology

Cracks was found in type 347 stainless steel internal attachment welds of a reactor for a high temperature, and high pressure hydrogen service. One of the possible causes of cracking is low cycle fatigue cracking induced by repetition of thermal stress to embrittled weld metal. Type 347 weld metal loses its ductility by presence of sigma phase and hydrogen.

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Spectral Response Surfaces And The Ringing Response Of Offshore Structures, I Ketut Suastika Nov 2008

Spectral Response Surfaces And The Ringing Response Of Offshore Structures, I Ketut Suastika

Makara Journal of Technology

A method, called spectral response surface method, is proposed for the study of the ringing phenomenon of offshore structures. Newman’s results for diffraction force on a column were reformulated in terms of the frequency components of the ocean surface and their Hilbert transforms. Using a first-order reliability method together with a dynamic model for the structural response, it is straightforward to calculate the ocean surface history most likely to generate an extreme ringing response and the ringing response history.

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Inelastic Performance Of Screw Connected Cfs Strap Braced Walls, Kostadin Velchev, Colin A. Rogers Nov 2008

Inelastic Performance Of Screw Connected Cfs Strap Braced Walls, Kostadin Velchev, Colin A. Rogers

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

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Curved, Precast, Pretensioned Concrete I-Girder Bridges, Wilast Amorn, Christopher Y. Tuan, Maher K. Tadros Nov 2008

Curved, Precast, Pretensioned Concrete I-Girder Bridges, Wilast Amorn, Christopher Y. Tuan, Maher K. Tadros

Civil Engineering Faculty Publications

Modern highway construction frequently requires bridges with horizontally curved alignments. Such bridges can be created by superimposing a curved deck slab onto straight girders or by splicing segmental straight girders on the chords of a curved roadway. Of these two methods, a curved superstructure usually results in simpler construction and better appearance.

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Thermal Analysis Of Cover Systems In Municipal Solid Waste Landfills, Nazli Yesiller, James Hanson, Nicolas K. Oettle, Wei-Lien Liu Nov 2008

Thermal Analysis Of Cover Systems In Municipal Solid Waste Landfills, Nazli Yesiller, James Hanson, Nicolas K. Oettle, Wei-Lien Liu

Civil and Environmental Engineering

Cover temperature variations were determined at four municipal solid waste landfills located in different climatic regions in North America: Michigan, New Mexico, Alaska, and British Columbia. Cover temperatures varied seasonally similarly to air temperatures and demonstrated amplitude decrement and phase lag with depth. Elevated temperatures in the underlying wastes resulted in warmer temperatures and low frost penetration in the covers compared to surrounding subgrade soils. The ranges of measured temperatures decreased and average temperatures generally increased (approximately 2°C/m) with depth. The ranges of measured temperatures (Tmax−Tmin) were 18–30°C and 13–21°C and the average temperatures …

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Bs News Nov 2008

Bs News

Building Services Engineering

No abstract provided.

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Site Response Zones And Short-Period Earthquake Ground Motion Projections For The Las Vegas Basin, Barbara Luke, Ying Liu Nov 2008

Site Response Zones And Short-Period Earthquake Ground Motion Projections For The Las Vegas Basin, Barbara Luke, Ying Liu

Civil and Environmental Engineering and Construction Faculty Research

A deterministic seismic hazard analysis was conducted to address the effect of local soil conditions on earthquake-induced strong ground motion in the Las Vegas Basin, Nevada (US). Using a large geological and geotechnical database, two response units were defined: a fine-grained unit, predominantly clay; and a coarse-grained unit, predominantly gravel. A moderate number of high-quality shallow shear wave velocity measurements were collected from which characteristic shear wave velocity profiles were developed for each response unit. An equivalent-linear one-dimensional site response model was used. The model was calibrated using a basin-wide, small-strain ground motion database. Calibration tests showed that ground motion …

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Characterizing Anomalous Ground For Engineering Applications Using Surface-Based Seismic Methods, Barbara Luke, Wanda Taylor, Carlos Calderon-Macias, Xiaohui Jin, Helena Murvosh, Jeff Wagoner Nov 2008

Characterizing Anomalous Ground For Engineering Applications Using Surface-Based Seismic Methods, Barbara Luke, Wanda Taylor, Carlos Calderon-Macias, Xiaohui Jin, Helena Murvosh, Jeff Wagoner

Civil and Environmental Engineering and Construction Faculty Research

Shallow seismics are in demand today in tectonically active regions to characterize and classify sites for earthquake response studies. The surface-based seismic methods are the most widely used for this purpose. In developed areas, the passive-source methods, also known as microtremor methods, are popular because of their efficiency and because the available frequency content is appropriate to determine an average shear-wave velocity for the upper 30 m. This information is required by the International Building Code, which is used by many municipalities in the US and elsewhere.

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Experimental Study On Web Crippling Of Lapped Cold-Formed Steel Channels Subjected To Interior Two-Flange Loading, Q. Rahman, K. Sennah Oct 2008

Experimental Study On Web Crippling Of Lapped Cold-Formed Steel Channels Subjected To Interior Two-Flange Loading, Q. Rahman, K. Sennah

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

No abstract provided.

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Gbtul- A Code For The Buckling Analysis Of Cold-Formed Steel Members, Rui Bebiano, Nuno Silvestre, Dinar Camotim Oct 2008

Gbtul- A Code For The Buckling Analysis Of Cold-Formed Steel Members, Rui Bebiano, Nuno Silvestre, Dinar Camotim

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

No abstract provided.

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Stability Of Cold-Formed Steel Simple And Lipped Angles Under Compression, Jorge Muinaiar Neto, Maximiliano Malite, W. F. Maia Oct 2008

Stability Of Cold-Formed Steel Simple And Lipped Angles Under Compression, Jorge Muinaiar Neto, Maximiliano Malite, W. F. Maia

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

No abstract provided.

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Overview Of The Standard For Seismic Design Of Cold-Formed Steel Structural Systems - Special Bolted Moment Frames, Helen Chen, Chia-Ming Uang, Reidar Bjorhovde, Bonnie Manley Oct 2008

Overview Of The Standard For Seismic Design Of Cold-Formed Steel Structural Systems - Special Bolted Moment Frames, Helen Chen, Chia-Ming Uang, Reidar Bjorhovde, Bonnie Manley

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

No abstract provided.

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19th International Specialty Conference: Recent Research And Developments In Cold-Formed Steel Structures, Wei-Wen Yu Center For Cold-Formed Steel Structures Oct 2008

19th International Specialty Conference: Recent Research And Developments In Cold-Formed Steel Structures, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

No abstract provided.

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Floor System Design For Distortional Buckling Including Sheathing Restraint, Y. Guan, Benjamin W. Schafer, R. H. Sangree Oct 2008

Floor System Design For Distortional Buckling Including Sheathing Restraint, Y. Guan, Benjamin W. Schafer, R. H. Sangree

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

No abstract provided.

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Generalized Beam Theory Formulation Able To Capture Load Application And Localized Web Buckling Effects, Dinar Camotim, V. M. Zeinoddini, Nuno M. F. Silva Oct 2008

Generalized Beam Theory Formulation Able To Capture Load Application And Localized Web Buckling Effects, Dinar Camotim, V. M. Zeinoddini, Nuno M. F. Silva

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

No abstract provided.

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