Engineering Commons^™

120 Seconds, Kari Sandouka

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Posting about living with impact from In All Things - an online hub committed to the claim that the life, death, and resurrection of Jesus Christ has implications for the entire world.

http://inallthings.org/120-seconds/

Photocatalytic Concrete Pavements: Laboratory Investigation Of No Oxidation Rate Under Varied Environmental Conditions, Joel K. Sikkema, Sae-Kee Ong, James E. Alleman

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Concrete pavements containing TiO₂ can be used for air pollution control by oxidizing NO_X under UV-bearing sunlight. This study employed a bench-scale photoreactor to estimate NO oxidation rates for varied environmental conditions. Rates correlated positively with NO inlet concentration and irradiance and negatively with relative humidity. No correlation occurred with flow rate. A decrease in slab moisture (previously unstudied) positively correlated with NO oxidation rate at 0–2% loss of saturated mass, but negatively correlated at losses greater that 2%. Although prior researchers deemed temperature insignificant, data indicated a positive correlation. Overall, rates ranged from 9.8–64 nmol∙m^-2∙s …

Distinctively Christian Engineering: Implementing Guiding Principles In Our Civil Curriculum, Joel K. Sikkema, Justin Vander Werff

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At Dordt College, we work to make our motto, Soli Deo Gloria (glory to God alone), the organizing principle for all activities. In the Engineering Department, it is our responsibility to continue to shape our program to be holistic and Christ-centered in order to equip our students to serve the Lord obediently in engineering. To direct the development and modification of our engineering curriculum, we established a set of five distinctively Christian guiding principles for engineering. Setting the direction for this work required a grounding point. Therefore, in a subsequent manuscript we evaluated the extent to which these principles were …

Finding Your Path, Michael Foster, Justin Vander Werff

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Each of us has a desire to do good, fulfilling work. How do we find this work? Do we discover it or is it something we create for ourselves? If we believe there is a particular area in which we should work, then work decisions can become even more burdensome. Since there are so many areas in which we could work, and many more we may not even know about, how do we know if we have chosen the right path? These questions are particularly acute for college students. From first-year students through seniors, some aspect of their journey toward …

Sola Gratia: Grace In The Engineering Curriculum And Profession, Ethan Brue

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Integral Christian higher education is in vogue. Most Christian institutions of higher education who take their mission seriously make the claim that the education offered to students is one where faith and learning are not separate. It is a belief that their entire educational enterprise is inexorably tied in some way, shape, or form to our new life in Christ. Most engineering programs on Christian campuses are the outgrowth of this perspective. Over the last fifty years, numerous philosophers, writers, scientists, and engineers have developed a solid foundation from which engineering can be understood as an essential calling in the …

Girder Load Distribution For Seismic Design Of Integral Bridges, Justin Vander Werff, Sri Sritharan

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Current seismic design practice related to integral bridge girder-to-cap beam connections allows little or no lateral seismic load to be distributed beyond the girders immediately adjacent to the column. However, distribution results from several large-scale tests have shown that the distribution of column seismic moment typically engages all the girders. An approach utilizing simple stiffness models to predict distribution in integral bridge structures is presented in detail; distribution predictions based on grillage analyses also are compared. The experimental results and the analytical results from the stiffness and grillage models show that current design methods related to vertical load distribution are …