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The Power of an Idea: The International Impacts of the Grand Challenges for Engineering Views & Comments

Mote Jr., Dame Ann Dowling, Ji Zhou

Engineering 2016, Volume 2, Issue 1,   Pages 4-7 doi: 10.1016/J.ENG.2016.01.025

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Engineering in the 21st Century: The Grand Challenges and the Grand Challenges Scholars Program

Mote Jr.

Engineering 2020, Volume 6, Issue 7,   Pages 728-732 doi: 10.1016/j.eng.2020.06.001

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Performance of seven highway construction contracting methods analyzed by project size

Edward MINCHIN Jr., Lourdes PTSCHELINZEW, Dev SHAH

Frontiers of Engineering Management 2018, Volume 5, Issue 2,   Pages 240-250 doi: 10.15302/J-FEM-2018040

Abstract: The conventional Design-Bid-Build (DBB) construction contracting method has had various drawbacks exposed in highway construction practice, including lack of communication, inefficient design, antagonizing relationships, and increased disputes. To mitigate the negative aspects of DBB, several alternative contracting methods and alternative project delivery systems have been devised and introduced to the industry over the past 30 years. Five such innovations were tested by a research team from the University of Florida under the sponsorship of the Florida Department of Transportation (FDOT). To perform a realistic assessment, this study categorized FDOT projects built between 2006 and 2015 into groups according to current contract amounts. Both absolute and relative metrics were defined and employed. For comparison purposes, a collective analysis on all gathered data was performed. Additionally, the influence of outliers on the results was examined. The results showed that analyses based on individual cost categories are more convincing because large projects tend to impose stronger influence on the analyses. In addition, outliers must be identified and screened to reach realistic and reliable conclusions. With regard to the actual performance of the contracting methods, each performs differently within different cost categories.

Keywords： alternative contracting methods     time     cost     performance evaluation    

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Advances in Computer Vision-Based Civil Infrastructure Inspection and Monitoring Review

Spencer Jr.,Vedhus Hoskere,Yasutaka Narazaki

Engineering 2019, Volume 5, Issue 2,   Pages 199-222 doi: 10.1016/j.eng.2018.11.030

Abstract:

Computer vision techniques, in conjunction with acquisition through remote cameras and unmanned aerial vehicles (UAVs), offer promising non-contact solutions to civil infrastructure condition assessment. The ultimate goal of such a system is to automatically and robustly convert the image or video data into actionable information. This paper provides an overview of recent advances in computer vision techniques as they apply to the problem of civil infrastructure condition assessment. In particular, relevant research in the fields of computer vision, machine learning, and structural engineering are presented. The work reviewed is classified into two types: inspection applications and monitoring applications. The inspection applications reviewed include identifying context such as structural components, characterizing local and global visible damage, and detecting changes from a reference image. The monitoring applications discussed include static measurement of strain and displacement, as well as dynamic measurement of displacement for modal analysis. Subsequently, some of the key challenges that persist towards the goal of automated vision-based civil infrastructure and monitoring are presented. The paper concludes with ongoing work aimed at addressing some of these stated challenges.

Keywords： Structural inspection and monitoring     Artificial intelligence     Computer vision     Machine learning     Optical flow    

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Effect of a commercial dispersion of multi walled carbon nanotubes on the hydration of an oil well cementing paste

Ocar Aurelio MENDOZA REALES,William C.PEARL Jr,Maria D. M. PAIVA,CristianeR.

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 2,   Pages 174-179 doi: 10.1007/s11709-015-0324-8

Abstract: This work studies the influence of a commercial dispersion of multi wall carbon nanotubes (MWCNT) on the hydration of a class G cement paste, at room and elevated down-hole temperatures. The MWCNT dispersion was produced with a solids concentration of 3.0 % by mass and an anionic surfactant as dispersing agent. Cement pastes with water-to-cement ratio of 0.45 and additions of solid MWCNT by mass of cement up to 0.50 % were studied. Isothermal calorimetry results showed a clear retardation of the hydration of cement caused by the surfactant contained in the MWCNT dispersion. Nevertheless, thermogravimetric evaluations showed that once the hydration reaction resumed, the retardation effect of the surfactant did not have a negative impact on the amount of hydration products precipitated. It was concluded that the commercial MWCNT dispersion presents a good potential to be applied in oil well cement pastes.

Keywords： carbon nanotubes     surfactant     retardation     combined water     C-S-H    

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Spectral characteristics of plant communities from salt marshes: A case study from Chongming Dongtan, Yangtze estuary, China

ZHANG Liquan, GAO Zhanguo, Armitage Richard, Kent Martin

Frontiers of Environmental Science & Engineering 2008, Volume 2, Issue 2,   Pages 187-197 doi: 10.1007/s11783-008-0004-1

Abstract: sampled for paired data on plant species composition and spectral reflectance using a FieldSpec Pro JR

Keywords： Spectral     multi-seasonal hyperspectral     invasive     JR     re-analysed    

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Wastewater treatment by catalytic wet air oxidation process over Al-Fe pillared clays synthesized using microwave irradiation

Halima Sassi, Gwendoline Lafaye, Hédi Ben Amor, Abdelaziz Gannouni, Mohamed Razak Jeday, Jacques Barbier-Jr

Frontiers of Environmental Science & Engineering 2018, Volume 12, Issue 1, doi: 10.1007/s11783-017-0971-1

Abstract: Microwave irradiation has been used to prepare Al, Fe-pillared clays from a natural Tunisian smectite from the El Hicha deposit (province of Gabes). Chemical analysis, XRD spectra and surface properties evidenced the success of pillaring process. The obtained solids present higher surface area and pore volume than conventionally prepared Al-Fe pillared clays. The main advantages of the microwave methodology are the considerable reduction of the synthesis time and the consumption of water. The microwave-derived Al-Fe pillared clays have been tested for catalytic wet air oxidation (CWAO) of phenol in a stirred tank at 160°C and 20 bar of pure oxygen pressure. These materials are efficient for CWAO of phenol and are highly stable despite the severe operating conditions (acidic media, high pressure, high temperature). The catalyst deactivation was also significantly hindered when compared to conventionally prepared clays. Al-Fe pillared clays prepared by microwave methodology are promising as catalysts for CWAO industrial water treatment.

Keywords： Water     Catalytic wet air oxidation     Pillared clays     Microwave     Phenol    

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Title Author Date Type Operation

The Power of an Idea: The International Impacts of the Grand Challenges for Engineering

Mote Jr., Dame Ann Dowling, Ji Zhou

Journal Article

Engineering in the 21st Century: The Grand Challenges and the Grand Challenges Scholars Program

Mote Jr.

Journal Article

Performance of seven highway construction contracting methods analyzed by project size

Edward MINCHIN Jr., Lourdes PTSCHELINZEW, Dev SHAH

Journal Article

High School Students from 157 Countries Convene to Address One of the 14 Grand Challenges for Engineering: Access to Clean Water

Sestak Jr.

Journal Article

Advances in Computer Vision-Based Civil Infrastructure Inspection and Monitoring

Spencer Jr.,Vedhus Hoskere,Yasutaka Narazaki

Journal Article

Effect of a commercial dispersion of multi walled carbon nanotubes on the hydration of an oil well cementing paste

Ocar Aurelio MENDOZA REALES,William C.PEARL Jr,Maria D. M. PAIVA,CristianeR.

Journal Article

Spectral characteristics of plant communities from salt marshes: A case study from Chongming Dongtan, Yangtze estuary, China

ZHANG Liquan, GAO Zhanguo, Armitage Richard, Kent Martin

Journal Article

Wastewater treatment by catalytic wet air oxidation process over Al-Fe pillared clays synthesized using microwave irradiation

Halima Sassi, Gwendoline Lafaye, Hédi Ben Amor, Abdelaziz Gannouni, Mohamed Razak Jeday, Jacques Barbier-Jr

Journal Article