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Full-Text Articles in Engineering
Numerical Simulation Of Shock Response And Dynamic Fracture Of A Concrete Dam Subjected To Impact Load, Lu Lu, Xin Li, Jing Zhou, Genda Chen, Dong Yun
Numerical Simulation Of Shock Response And Dynamic Fracture Of A Concrete Dam Subjected To Impact Load, Lu Lu, Xin Li, Jing Zhou, Genda Chen, Dong Yun
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The shock response and dynamic fracture of concrete gravity dams under impact load are the key problems to evaluate the antiknock safety of the dam. This study aims at understanding the effects of impact shock on the elastic response and dynamic fracture of concrete gravity dams. Firstly, this paper uses acceleration records of a concrete gravity dam under impact to establish the correct way to determine the concrete gravity dam of the fundamental frequency and present cut sheets multi-degree-of-freedom dynamic modeling. Under strong impact loading, the constitutive relation of concrete gravity dam and the highest frequency of the impact are …
Object Detection For Agricultural And Construction Environments Using An Ultrasonic Sensor, Joseph S. Dvorak, Marvin L. Stone, Kelvin P. Self
Object Detection For Agricultural And Construction Environments Using An Ultrasonic Sensor, Joseph S. Dvorak, Marvin L. Stone, Kelvin P. Self
Biosystems and Agricultural Engineering Faculty Publications
This study tested an ultrasonic sensor‘s ability to detect several objects commonly encountered in outdoor agricultural or construction environments: a water jug, a sheet of oriented strand board (OSB), a metal fence post, a human model, a wooden fence post, a Dracaena plant, a juniper plant, and a dog model. Tests were performed with each target object at distances from 0.01 to 3 m. Five tests were performed with each object at each location, and the sensor‘s ability to detect the object during each test was categorized as "undetected," "intermittent," "incorrect distance," "good." Rigid objects that presented a larger surface …
Bakken Crude Oil And The Changing Logistics Of The American Oil Industry, Austin Rau
Bakken Crude Oil And The Changing Logistics Of The American Oil Industry, Austin Rau
Independent Research
The extraction of Bakken crude oil in the Williston Basin of North Dakota is transforming how petroleum is shipped. Before 2008, North American oil was carried primarily via pipeline from source regions to refineries along the Gulf Coast or to metropolitan areas close to consumers. The current pipeline system is ill-equipped to accommodate massive volumes of oil from this previously low producing region. Lack of infrastructure and high demand for “light tight oil” (LTO) led to the use of railroads as a means of moving the product to refineries across the nation. Transporting oil via rail over long distances was …
Child Safety Near Pot Shops In Denver, Jacob Flansberg, Elise Jackson, Amelia Theobald
Child Safety Near Pot Shops In Denver, Jacob Flansberg, Elise Jackson, Amelia Theobald
Engineering Applications of GIS - Laboratory Exercises
Some major factors in deciding where one’s family should live include relative safety of the neighborhood, available green space such as parks and schools, grocery stores, and other commercial retail in the area. With the legalization of marijuana in states such as Colorado, proximity of these marijuana dispensaries has become another factor. The Normalized Difference Vegetation Index (NDVI) can be used as a measure of vegetation, and to determine areas with high levels of irrigated vegetation. Using ArcGIS Modelbuilder, the data from an NDVI analysis can be used to determine the proximity of marijuana shops to these types of greenspaces …
Impact Of Optimally Minimizing Delay Times On Safety At Signalized Intersections In Urban Areas, Case Study: The City Of Virginia Beach, Eugene Vida Maina, Albert Forde, R. Michael Robinson
Impact Of Optimally Minimizing Delay Times On Safety At Signalized Intersections In Urban Areas, Case Study: The City Of Virginia Beach, Eugene Vida Maina, Albert Forde, R. Michael Robinson
VMASC Publications
Optimally minimizing delay times at signalized intersections can significantly improve both traffic flow and safety. However, most traffic flow optimizing tools do not measure the effect on safety. This study uses nonlinear programming (NLP) algorithms to optimally minimize delay times and employs both Safety performance functions (SPFs) and empirical Bayes (EB) before-after methodology to measure the impact on safety presented as a Crash Modification Factor (CMF). A crash modification factor (CMF) is a multiplicative factor used by transportation practitioners to compute the expected number of crashes at specific study site(s) after a countermeasure has been proposed or is implemented. Using …