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-
- Description:
- Acoustic emission (AE) testing was deployed on details of two large steel Interstate Highway bridges: one cantilever through-truss and one trapezoidal box girder bridge. Quantitative measurements of activity levels at known and suspected crack locations were made by monitoring AE under normal service loads (e.g., live traffic and wind). AE...
- Keyword:
- Acoustic emission testing
- Creator:
- Hopwood, T., Corr, D. J., and Kosnik, D. E.
- Owner:
- Nurganym Agzamova
- Publisher:
- Northwestern University Libraries
- Language:
- English
- Date Uploaded:
- 06/21/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 2010
- Resource Type:
- Research Paper
-
- Description:
- Scour is by far the primary cause of bridge failures in the United States. Scour and other hydraulic effects are particularly threatening because the deterioration is often invisible, hidden beneath turbid water. Many scour monitoring methods attempt to measure the development of scour pockets themselves. However, this is difficult due...
- Keyword:
- Scours at bridges and Tiltmeter
- Creator:
- Kosnik, David and Ng, Steve
- Owner:
- Nurganym Agzamova
- Publisher:
- Northwestern University Libraries
- Language:
- English
- Date Uploaded:
- 06/21/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 2010-02-17
- Resource Type:
- Research Paper
-
- Description:
- Kosnik, D. E., Northwestern University . Infrastructure Technology Institute, Department of Civil Environmental Engineering, Robert R. McCormick School of Engineering Applied Science. (2008). A new approach to acoustic emission testing of difficult-to-reach steel bridge details. Evanston, Illinois: Infrastructure Technology Institute/Department of Civil & Environmental Engineering.
- Keyword:
- Acoustic emission testing
- Creator:
- Kosnik, David E.
- Owner:
- Nurganym Agzamova
- Language:
- English
- Date Uploaded:
- 06/21/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 2008
- Resource Type:
- Research Paper
-
- Description:
- This paper describes application of AE monitoring techniques to localize the sources of large noises in civil structures. These noises occur during operation of moveable portions of a structure in such things as lift bridges and moveable sports stadium roofs. The use of straightforward AE monitoring techniques can provide clear...
- Keyword:
- Acoustic emission testing
- Creator:
- Prine, David
- Owner:
- Nurganym Agzamova
- Publisher:
- Northwestern University Libraries
- Language:
- English
- Date Uploaded:
- 06/21/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 2004
- Resource Type:
- Research Paper
-
- Description:
- This paper describes the details of installation and operation of a commercially- available wireless system to measure response of an interior cosmetic crack in a residential structure over a period of a year. Wireless data loggers managed the response of low power draw potentiometers that measured micrometer changes in crack...
- Keyword:
- structural health monitoring
- Creator:
- Dowding, C.H. , Koegel, T., and Kotowsky, M.
- Owner:
- Nurganym Agzamova
- Language:
- English
- Date Uploaded:
- 07/05/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 2012
- Resource Type:
- Research Paper
-
- Description:
- This paper describes the technology and methods deployed in the continuous autonomous remote monitoring of cracks in interior and exterior walls of a residence near a limestone quarry. The objective is to quantitatively compare crack response due to blast-induced ground motion to that induced by diurnal temperature changes, weather fronts,...
- Keyword:
- Cracking of concrete and Structural health monitoring
- Creator:
- David E. Kosnik
- Owner:
- Nurganym Agzamova
- Publisher:
- Northwestern University Libraries
- Language:
- English
- Date Uploaded:
- 07/05/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 2009
- Resource Type:
- Research Paper
-
- Description:
- In this paper vibratory crack response is compared to that produced by volumetric changes in foundation soils induced by natural events. These natural phenomena include changes in the water table, changes in soil moisture, and formation of ice lenses to name a few. Previous papers have compared vibratory responses of...
- Keyword:
- Cracking of concrete and Structural health monitoring
- Creator:
- Catherine Aimone-Martin, Charles H. Dowding, Jeffrey Meissner , and V. Rosenhaim
- Owner:
- Nurganym Agzamova
- Publisher:
- Northwestern University Libraries
- Language:
- English
- Date Uploaded:
- 07/05/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 2009
- Resource Type:
- Research Paper
-
- Description:
- This paper describes the technology and methods deployed in the continuous autonomous remote monitoring of cracks in interior and exterior walls of a residence near a limestone quarry. The object is to quantitatively compare crack response to blast-induced ground motion to that induced by diurnal temperature changes, weather fronts, and...
- Keyword:
- Cracking of concrete and Structural health monitoring
- Creator:
- David E. Kosnik
- Owner:
- Nurganym Agzamova
- Publisher:
- Northwestern University Libraries
- Language:
- English
- Date Uploaded:
- 07/05/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 2008-03-21
- Resource Type:
- Research Paper
-
- Description:
- Micro-meter dynamic crack responses in a two story structure to rock blasting- and wind gust- excitation are compared to those induced by long term climatological effects. These measurements substantiate the conservancy of the 12.5 mm/s (0.5 in./s) blasting vibration control to protect residential structures against cracking. The test structure was...
- Keyword:
- Micrometers , Cracking of concrete, Structural health monitoring, and Blast effect
- Creator:
- Charles H. Dowding and C. T. Aimone-Martin
- Owner:
- Nurganym Agzamova
- Publisher:
- Northwestern University Libraries
- Language:
- English
- Date Uploaded:
- 07/05/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 2007
- Resource Type:
- Research Paper
-
- Description:
- A unique judicial opportunity allowed measurement of the response of three cracks in residential structure to blasting for underground aggregate mining. Instrumented cracks were located in the interior basement CMU mortar and upstairs dry wall as well as exterior brick work. The dynamic environment was unusual. Even though the blasting...
- Keyword:
- Cracking of concrete and Structural health monitoring
- Creator:
- Mike Waldron, C.H. Dowding , and G.F. Revey
- Owner:
- Nurganym Agzamova
- Publisher:
- Northwestern University Libraries
- Language:
- English
- Date Uploaded:
- 07/05/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 2007
- Resource Type:
- Research Paper
-
- Description:
- Crack and structural response to construction trench blasting was measured in a woodframe house with a stucco exterior. Blasts at distances between 232 m to 368 m produced peak particle velocities (PPV) and air blast over pressures (AB) of 9 mm/sec and 0.02 kPa (123 dB), respectively. Structural response velocities...
- Keyword:
- Structural health monitoring
- Creator:
- Charles H. Dowding , Vitor L. Rosenhaim, and Catherine T. Aimone-Martin
- Owner:
- Nurganym Agzamova
- Publisher:
- Northwestern University Libraries
- Language:
- English
- Date Uploaded:
- 07/05/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 2005
- Resource Type:
- Research Paper
-
- Description:
- This paper describes qualification of devices to measure sub micro-meter changes in crack width, which is the basis of autonomous crack monitoring for control of blasting vibrations. Performance of LVDT, eddy current and potentiometer sensors to monitor long-term and transient displacements will be described. Potentiometers are attractive for wireless measurement,...
- Keyword:
- Structural health monitoring
- Creator:
- Hasan Ozer, Charles H. Dowding, and Dan Marron
- Owner:
- Nurganym Agzamova
- Publisher:
- Northwestern University Libraries
- Language:
- English
- Date Uploaded:
- 07/05/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 2007
- Resource Type:
- Research Paper
-
- Description:
- This paper describes developments of integrated tools for predicting, monitoring, and controlling ground movements associated with excavations in urban areas. Successful use of monitoring data to update performance predictions of supported excavations depends equally on reasonable numerical simulations of performance, the type of monitoring data used as observations, and the...
- Keyword:
- Nondestructive testing and Ground control
- Creator:
- Richard J. Finno and Youssef M. A. Hashash
- Owner:
- Nurganym Agzamova
- Publisher:
- Northwestern University Libraries
- Language:
- English
- Date Uploaded:
- 07/12/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 2009
- Resource Type:
- Research Paper
-
- Description:
- Successful use of monitoring data to update performance predictions of supported excavations depends equally on reasonable numerical simulations of performance, the type of monitoring data used as observations, and the inverse analysis techniques used to minimize the difference between predictions and observed performance. This paper summarizes each of these factors...
- Keyword:
- Nondestructive testing , Excavation, and Ground control
- Creator:
- Richard J. Finno
- Owner:
- Nurganym Agzamova
- Publisher:
- Northwestern University Libraries
- Language:
- English
- Date Uploaded:
- 07/12/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 2007
- Resource Type:
- Research Paper
-
- Description:
- This paper presents the results of 159 finite element simulations conducted to define the effects of excavation geometry, i.e., length, width and depth of excavation, wall system stiffness, and factor of safety against basal heave on the 3-dimensional ground movements caused by excavation through clays. The results of the analyses...
- Keyword:
- Three-dimensional analysis, Nondestructive testing , and Excavation
- Creator:
- Jill Frances Roboski, James Tanner Blackburn, and Richard J. Finno
- Owner:
- Nurganym Agzamova
- Publisher:
- Northwestern University Libraries
- Language:
- English
- Date Uploaded:
- 07/12/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 2006
- Resource Type:
- Research Paper
-
- Description:
- Several three-dimensional effects were observed in the performance monitoring data collected during excavation for the Ford Engineering Design Center (FEDC) in Evanston, Illinois. These responses are related to lateral deformations of the soil around the excavation walls, forces in the cross-lot and diagonal bracing that supported the temporary wall and...
- Keyword:
- Three-dimensional analysis, Excavation, Clay soils, and Ground control
- Creator:
- Richard J. Finno and James Tanner Blackburn
- Owner:
- Nurganym Agzamova
- Publisher:
- Northwestern University Libraries
- Language:
- English
- Date Uploaded:
- 07/12/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 2006
- Resource Type:
- Research Paper
-
- Description:
- An empirical procedure for fitting a complementary error function (erfc) to settlement and lateral ground movement data in a direction parallel to an excavation support wall is proposed based on extensive optical survey data obtained around a 12.8 m excavation in Chicago. The maximum ground movement and the height and...
- Keyword:
- Performance data, Clay soils , Excavation, and Ground control
- Creator:
- Jill Frances Roboski
- Owner:
- Nurganym Agzamova
- Publisher:
- Northwestern University Libraries
- Language:
- English
- Date Uploaded:
- 07/12/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 2005
- Resource Type:
- Research Paper
-
- Description:
- Gentrification - the process in which higher income (and often younger) households displace lower income residents of a city neighborhood - has been occurring in many urban neighborhoods over the last few decades. This process changes the demographics, and often the essential character, of the neighborhood. As a result, we...
- Keyword:
- Gentrification and Urban transportation
- Creator:
- Emily R. Kushto and Joseph L. Schofer
- Owner:
- Nurganym Agzamova
- Publisher:
- Northwestern University Libraries
- Language:
- English
- Date Uploaded:
- 07/19/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 2008-01-10
- Resource Type:
- Research Paper
-
- Description:
- The paper deals with the behavior of fluid cement pastes, formulated from Self Consolidating Concretes (SCCs), and the experimental correlation of fundamental rheological properties, such as the yield stress and the viscosity, with measurements from field tests, such as the mini-cone slump flow test. As a matter of fact, several...
- Keyword:
- Cement rheology and Self-consolidating concrete
- Creator:
- Liberato Ferrara, Nathan Tregger, and Surendra P. Shah
- Owner:
- Nurganym Agzamova
- Publisher:
- Northwestern University Libraries
- Language:
- English
- Date Uploaded:
- 07/19/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 2007
- Resource Type:
- Research Paper
-
- Description:
- The gradual evolution of the material properties of a cement-based material, i.e. the stiffness of cement paste, is the result of the continuous change of the microstructure with the progress of the hydration process. Based on an existing micromechanical model for the simulation of the shear and elastic modulus of...
- Keyword:
- Structural health monitoring and Cement rheology
- Creator:
- Klaas van Breugel, Surendra P. Shah, Guang Ye, Thomas Voigt, and Zhihui Sun
- Owner:
- Nurganym Agzamova
- Publisher:
- Northwestern University Libraries
- Language:
- English
- Date Uploaded:
- 07/19/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 2004
- Resource Type:
- Research Paper
-
- Description:
- In this paper, the correlation of reflection loss measured by an ultrasonic shear wave reflection method and the microstructure in cement-based material is investigated. Three cement pastes (Portland cement type I) with different water-cement ratios (0.35, 0.50 and 0.60) cured at 25 °C were examined. The ultrasonic shear wave reflection...
- Keyword:
- Nondestructive testing
- Creator:
- Klaas van Breugel, Surendra P. Shah, Guang Ye, Thomas Voigt, and Zhihui Sun
- Owner:
- Nurganym Agzamova
- Publisher:
- Northwestern University Libraries
- Language:
- English
- Date Uploaded:
- 07/19/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 2003
- Resource Type:
- Research Paper
-
- Description:
- This paper describes proposed schemes for describing and indexing two image collections and requirements for the software that would give the end-user access to thesaurus terms and a graphical display of the faceted classification structures of indexing records. Editorial cartoons comprise one collection, dance videos the other.
- Keyword:
- classification, image collections, and thesauri
- Creator:
- Barnes, Barbara, Johnson, Eric H., and Young, Jennifer B.
- Contributor:
- Cochrane, Pauline A.
- Owner:
- Jennifer B Young
- Language:
- English
- Date Uploaded:
- 07/20/2017
- Date Modified:
- 04/04/2018
- Date Created:
- 1998
- Resource Type:
- Research Paper
- Alternate Identifier:
- 10.7152/acro.v9i1.12742
-
- Description:
- In 1936 Modibo Keita, a twenty-year-old student at the distinguished Ecole William Ponty in Gorée, Senegal, wrote his “mémoire de fin d'étude” on Soninke childhood. The original manuscript is held in the archives of French West Africa in Dakar, part of the collection of “cahiers de William Ponty.” This paper... and En 1936 Modibo Keita, un étudiant de vingt ans à l'école distingué William Ponty à Gorée, au Sénégal, a écrit son mémoire de fin d'étude sur l’enfance sarakollé. Le manuscrit original se trouve dans les archives de l'Afrique occidentale française à Dakar, où il fait partie de la collection de...
- Keyword:
- Mali, Bambara, Malinke, auto-ethnography, French colonial education, ethnography, Ecole William Ponty, 1930s, French West Africa, ethnicity, Modibo Keita, Soninke, Mande childhood, Malian childhood, and Cahiers William Ponty
- Creator:
- Marcia Tiede
- Owner:
- Marcia Tiede
- Publisher:
- Mande Studies Association = Association des Etudes Mandé
- Language:
- French and English
- Date Uploaded:
- 11/07/2018
- Date Modified:
- 02/27/2019
- Date Created:
- 2014-09-30
- Resource Type:
- Research Paper
-
- Description:
- Within the world of art music, composers have employed a variety of techniques to infuse popular music elements into their writing. This document is an examination of specific instances of this trend in twenty-first century wind ensemble repertoire. The study is limited to twenty-first century wind ensemble works by living...
- Keyword:
- 21st Century, Jonathan Newman, Twenty-First Century, Single, Band, Benjamin Taylor, Seeds of Glass, Tight Squeeze, Popular Music, and Alex Shapiro
- Subject:
- Shapiro, Alex, 1962-, Newman, Jonathan, Taylor, Benjamin Dean, 1983-, and Band music
- Creator:
- Chris Kaatz
- Owner:
- Christopher Thomas Kaatz
- Language:
- English
- Date Uploaded:
- 06/25/2020
- Date Modified:
- 06/26/2020
- Date Created:
- 2020-06-15
- Resource Type:
- Research Paper
-
- Description:
- Building Information Modeling (BIM) and Virtual reality (VR) have attracted growing attention within the architecture, engineering, and construction (AEC) industry in recent years. Integration of BIM and VR technology can develop workflow efficiency through enhanced common understanding and prepare students in architecture and engineering programs to become leaders of the...
- Keyword:
- AEC education, performance assessment, building information modeling, and virtual reality
- Creator:
- Sepehr Alizadehsalehi, Joseph C. Huang, and Ahmad Hadavi
- Owner:
- Ahmad Hadavi
- Publisher:
- MDPI
- Language:
- English
- Date Uploaded:
- 04/12/2021
- Date Modified:
- 04/12/2021
- Resource Type:
- Research Paper
- Alternate Identifier:
- DOI: 10.3390/app11073225
-
- Description:
- Cite this article: Shen, J., McFarland, A.G., Blaustein, R.A. et al. An improved workflow for accurate and robust healthcare environmental surveillance using metagenomics. Microbiome 10, 206 (2022). https://doi.org/10.1186/s40168-022-01412-x and Background: Effective surveillance of microbial communities in the healthcare environment is increasingly important in infection prevention. Metagenomics-based techniques are promising due to their untargeted nature but are currently challenged by several limitations: (1) they are not powerful enough to extract valid signals out of the background noise for low-biomass samples,...
- Keyword:
- Environmental surveillance, Low biomass, Sequencing depth prediction, Infection prevention, Machine learning, Quantitative metagenomics, Viability, and Quantification
- Subject:
- Environmental monitoring, Nosocomial infections--Prevention, Quantitative research, Machine learning, and Metagenomics
- Creator:
- K. Allison Perry-Dow, Anahid A. Moghadam, Vincent B. Young, Alexander G. McFarland, Laura J. Rose, Ryan A. Blaustein, Erica M. Hartmann , Jiaxian Shen, and Mary K. Hayden
- Contributor:
- Centers for Disease Control and Prevention (funding agency)
- Owner:
- Jiaxian SHEN
- Publisher:
- Microbiome
- Language:
- English
- Date Uploaded:
- 12/19/2022
- Date Modified:
- 12/19/2022
- Date Created:
- 2022-12-02
- Resource Type:
- Research Paper
- Alternate Identifier:
- DOI 10.1186/s40168-022-01412-x, PMID 36457108, and PMCID PMC9716758
-
- Description:
- The aviation industry is set to see another significant leap in new technology, namely electric aircraft. As of the time of this research, both 9-seat and 19-seat aircraft would be ready to be launched by air service providers under the Essential Air Service (EAS) program. While electric aircraft manufacturers are...
- Keyword:
- SCASD, aviation batteries, EAS, and Electric aircraft
- Subject:
- Essential Air Service (Program : U.S.)
- Creator:
- Smith, Kenneth, Lu, Chien-tsung, Li, Dongyang , and Guzek, Joshua
- Owner:
- Dongyang Li
- Publisher:
- Journal of Multidisciplinary Engineering Science and Technology (JMEST)
- Language:
- English
- Date Uploaded:
- 07/13/2023
- Date Modified:
- 07/21/2023
- Date Created:
- 2022-03-06
- Resource Type:
- Research Paper