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Articles 1 - 11 of 11
Full-Text Articles in Engineering
A Quantitative Study Of Robustness Characteristics In Steel Framed Structures, Christopher Herman Raebel
A Quantitative Study Of Robustness Characteristics In Steel Framed Structures, Christopher Herman Raebel
Dissertations (1934 -)
Robustness is a desirable property in any structural design. Robustness may be thought of as the building's inherent structural ability to resist loads other than those anticipated during design. Examples of unanticipated loads are damage to a column or beam due to impact; damage due to the concussion of a blast; strength reduction due to extreme heat during a fire; and localized accidental overload of a beam or column. Each of these events, although very different in their nature, has one major point in common; in each case the path of load resistance changes in a way that was not …
Tertiary-Treated Municipal Wastewater Is A Significant Point Source Of Antibiotic Resistance Genes Into Duluth-Superior Harbor, Patrick J. Mcnamara, Tucker R. Burch, Timothy M. Lapara, David T. Tan, Mi Yan, Jessica J. Eichmiller
Tertiary-Treated Municipal Wastewater Is A Significant Point Source Of Antibiotic Resistance Genes Into Duluth-Superior Harbor, Patrick J. Mcnamara, Tucker R. Burch, Timothy M. Lapara, David T. Tan, Mi Yan, Jessica J. Eichmiller
Civil and Environmental Engineering Faculty Research and Publications
In this study, the impact of tertiary-treated municipal wastewater on the quantity of several antibiotic resistance determinants in Duluth-Superior Harbor was investigated by collecting surface water and sediment samples from 13 locations in Duluth-Superior Harbor, the St. Louis River, and Lake Superior. Quantitative PCR (qPCR) was used to target three different genes encoding resistance to tetracycline (tet(A), tet(X), and tet(W)), the gene encoding the integrase of class 1 integrons (intI1), and total bacterial abundance (16S rRNA genes) as well as total and human fecal contamination levels (16S rRNA genes specific to the genus Bacteroides …
Resonant Microcantilevers For The Determination Of The Loss Modulus Of Thin Polymer Films, Cedric Ayela, Stephen M. Heinrich, Fabien Josse, Isabelle Dufour
Resonant Microcantilevers For The Determination Of The Loss Modulus Of Thin Polymer Films, Cedric Ayela, Stephen M. Heinrich, Fabien Josse, Isabelle Dufour
Civil and Environmental Engineering Faculty Research and Publications
The increasing interest in polymer materials creates the need for accurate tools to characterize their mechanical properties. Due to energy dissipation in polymers during deformation, these materials exhibit viscoelastic behavior. Accurate determination of these viscoelastic properties and, more specifically, viscous losses, remains challenging and mainly unknown for thin polymer films. In this paper, a straightforward method to determine the loss modulus of organic materials using resonating microcantilevers has been developed. The extracted results for polyisobutylene show the variation of viscous losses over a large range of frequencies (7-350 kHz).
Capturing The Lost Phosphorus, Bruce E. Rittmann, Brooke Mayer, Paul Westerhoff, Mark Edwards
Capturing The Lost Phosphorus, Bruce E. Rittmann, Brooke Mayer, Paul Westerhoff, Mark Edwards
Civil and Environmental Engineering Faculty Research and Publications
Minable phosphorus (P) reserves are being depleted and will need to be replaced by recovering P that currently is lost from the agricultural system, causing water-quality problems. The largest two flows of lost P are in agricultural runoff and erosion (∼46% of mined P globally) and animal wastes (∼40%). These flows are quite distinct. Runoff has a very high volumetric flow rate, but a low P concentration; animal wastes have low flow rates, but a high P concentration together with a high concentration of organic material. Recovering the lost P in animal wastes is technically and economically more tractable, and …
A Computationally Efficient Ground-Motion Selection Algorithm For Matching A Target Response Spectrum Mean And Variance, Nirmal Jayaram, Ting Lin, Jack W. Baker
A Computationally Efficient Ground-Motion Selection Algorithm For Matching A Target Response Spectrum Mean And Variance, Nirmal Jayaram, Ting Lin, Jack W. Baker
Civil and Environmental Engineering Faculty Research and Publications
Dynamic structural analysis often requires the selection of input ground motions with a target mean response spectrum. The variance of the target response spectrum is usually ignored or accounted for in an ad hoc manner, which can bias the structural response estimates. This manuscript proposes a computationally efficient and theoretically consistent algorithm to select ground motions that match the target response spectrum mean and variance. The selection algorithm probabilistically generates multiple response spectra from a target distribution, and then selects recorded ground motions whose response spectra individually match the simulated response spectra. A greedy optimization technique further improves the match …
On The Relative Sensitivity Of Mass-Sensitive Chemical Microsensors, Luke A. Beardslee, S. Truax, J.-J. Su, Stephen M. Heinrich, Fabien Josse Phd, O. Brand
On The Relative Sensitivity Of Mass-Sensitive Chemical Microsensors, Luke A. Beardslee, S. Truax, J.-J. Su, Stephen M. Heinrich, Fabien Josse Phd, O. Brand
Civil and Environmental Engineering Faculty Research and Publications
In this work, the chemical sensitivity of mass-sensitive chemical microsensors with a uniform layer sandwich structure vibrating in their lateral or in-plane flexural modes is investigated. It is experimentally verified that the relative chemical sensitivity of such resonant microsensors is -to a first order- independent of the microstructure's in-plane dimensions and the flexural eigenmode used, and only depends on the layer thicknesses and densities as well as the sorption properties of the sensing film. Important implications for the design of mass-sensitive chemical microsensors are discussed, whereby the designer can focus on the layer stack to optimize the chemical sensitivity and …
Influence Of Non-Ideal Clamping In Microcantilever Resonant Frequency Estimation, L. Fadel-Taris, Cedric Ayela, Isabelle Dufour, Fabien Josse, Stephen M. Heinrich, D. Saya, O. Brand
Influence Of Non-Ideal Clamping In Microcantilever Resonant Frequency Estimation, L. Fadel-Taris, Cedric Ayela, Isabelle Dufour, Fabien Josse, Stephen M. Heinrich, D. Saya, O. Brand
Civil and Environmental Engineering Faculty Research and Publications
Among the most promising sensing platforms are resonating microcantilevers due to their high sensitivity and wide application range. A key parameter of the device implementation is the predicted value of the resonant frequency that depends on the modeling and considerations of relevant physical phenomena. In fact, the estimation based on the conventional, perfectly clamped, Bernoulli-Euler cantilever beam does not lead to satisfactory accuracy in certain cases. Hence this work investigates two system characteristics that may affect the re sonant frequency (a support effect and a so-called rim effect) and provides solutions for a straightforward estimation of rim dimension using resonance …
Damping And Mass Sensitivity Of Laterally Vibrating Resonant Microcantilevers In Viscous Liquid Media, Russell Cox, Jinjin Zhang, Fabien Josse, Stephen M. Heinrich, Isabelle Dufour, Luke A. Beardslee, Oliver Brand
Damping And Mass Sensitivity Of Laterally Vibrating Resonant Microcantilevers In Viscous Liquid Media, Russell Cox, Jinjin Zhang, Fabien Josse, Stephen M. Heinrich, Isabelle Dufour, Luke A. Beardslee, Oliver Brand
Civil and Environmental Engineering Faculty Research and Publications
The effect of liquid viscosity and density on the characteristics of laterally excited microcantilevers is investigated and compared to transversely excited microcantilevers. When immersed into a viscous liquid medium such as water from air, the resonant frequency of laterally (in-plane) vibrating microcantilevers is shown to decrease by only 5-10% as compared to ~50% reduction for transversely (out-of-plane) vibrating microcantilevers. Furthermore, as the viscosity of the medium increases the resonant frequency of a laterally vibrating beam is shown to decrease at a slower rate than that of a transversely vibrating beam. The decreased viscous damping also leads to increases in the …
Instrumentation Of Buildings To Enhance Student Learning - A Case Study At Marquette University's Discovery Learning Compex, Meredith Claeys
Instrumentation Of Buildings To Enhance Student Learning - A Case Study At Marquette University's Discovery Learning Compex, Meredith Claeys
Master's Theses (2009 -)
The new engineering building at Marquette University, the Discovery Learning Complex, has been designed to change the way engineering education is delivered by using the building itself as a teaching tool for the next generation of engineers. The structural system for the building has been instrumented to allow students access to structural system data, wind speed data, and foundation pressures enabling this data from the building to be integrated into the teaching environment. The building also will display aspects of the building management system for public viewing. An array of weather stations will be installed on the roof, allowing the …
A Petri Net Simulation Model For Virtual Construction Of Earthmoving Operations, F. F. Cheng, Y. W. Wang, Yong Bai
A Petri Net Simulation Model For Virtual Construction Of Earthmoving Operations, F. F. Cheng, Y. W. Wang, Yong Bai
Civil and Environmental Engineering Faculty Research and Publications
A common and extended Petri net simulation framework for virtual construction of earthmoving operations is developed to simulate dynamic changes of workflow and information flow in the earthmoving construction process and illustrate the constraint relationship between various operational equipment and construction restrictions. The proposed framework considers factors that influence earthmoving operations including randomness of construction activities, individual preference of equipment scheduling, and constraint relationship between equipment and construction environment. With the given equipment availability and project indirect cost, the framework can predict construction situation, equipment utilization rate, estimated duration and cost to achieve visualized and intelligent scheduling of virtual construction …
Modeling Of Cfrp-Concrete Interface Subjected To Coupled Pull-Out And Push-Off Actions, Tayyebeh Mohammadi, Baolin Wan, Jian-Guo Dai
Modeling Of Cfrp-Concrete Interface Subjected To Coupled Pull-Out And Push-Off Actions, Tayyebeh Mohammadi, Baolin Wan, Jian-Guo Dai
Civil and Environmental Engineering Faculty Research and Publications
This paper presents a finite element (FE) modeling method for predicting the IC debonding failure when the FRP/concrete interface is subjected to coupled pull-out (shear) and push-off (dowel) actions. Damaged plasticity model was used to simulate the behavior of concrete close to FRP/concrete interface. A thin damage band exposed to mixed-mode loading condition was modeled separately along the FRP-concrete interface. Cohesive elements were used to model the FRP/concrete interface. A sensitivity analysis was performed to find the appropriate damaged band dimensions, bending stiffness of FRP, and tensile strength of concrete for the model. The numerical results were validated by the …