4 resultados para Dopamine detection

em Iowa Publications Online (IPO) - State Library, State of Iowa (Iowa), United States


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The purpose of this research was to summarize existing nondestructive test methods that have the potential to be used to detect materials-related distress (MRD) in concrete pavements. The various nondestructive test methods were then subjected to selection criteria that helped to reduce the size of the list so that specific techniques could be investigated in more detail. The main test methods that were determined to be applicable to this study included two stress-wave propagation techniques (impact-echo and spectral analysis of surface waves techniques), infrared thermography, ground penetrating radar (GPR), and visual inspection. The GPR technique was selected for a preliminary round of “proof of concept” trials. GPR surveys were carried out over a variety of portland cement concrete pavements for this study using two different systems. One of the systems was a state-of-the-art GPR system that allowed data to be collected at highway speeds. The other system was a less sophisticated system that was commercially available. Surveys conducted with both sets of equipment have produced test results capable of identifying subsurface distress in two of the three sites that exhibited internal cracking due to MRD. Both systems failed to detect distress in a single pavement that exhibited extensive cracking. Both systems correctly indicated that the control pavement exhibited negligible evidence of distress. The initial positive results presented here indicate that a more thorough study (incorporating refinements to the system, data collection, and analysis) is needed. Improvements in the results will be dependent upon defining the optimum number and arrangement of GPR antennas to detect the most common problems in Iowa pavements. In addition, refining highfrequency antenna response characteristics will be a crucial step toward providing an optimum GPR system for detecting materialsrelated distress.

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This guide is intended to serve as the fi rst step in your journey toward understanding your child’s hearing loss and the resources available for your child and your family. Research provides clear evidence that if a child with hearing loss is to succeed in both language and educational development, the involvement of parents is crucial. This guide will equip you with the basic knowledge and resources you need to navigate Iowa’s service system. Here you will find: • information about the professionals who will work with your child • information about family support • your child’s education and communication options • your rights and responsibilities as the parent of child who is deaf or hard of hearing • links to other important resources • a glossary of new words you may encounter

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This guide is intended to serve as the fi rst step in your journey toward understanding your child’s hearing loss and the resources available for your child and your family. Research provides clear evidence that if a child with hearing loss is to succeed in both language and educational development, the involvement of parents is crucial. This guide will equip you with the basic knowledge and resources you need to navigate Iowa’s service system. Here you will find: • information about the professionals who will work with your child • information about family support • your child’s education and communication options • your rights and responsibilities as the parent of child who is deaf or hard of hearing • links to other important resources • a glossary of new words you may encounter Esta guía tiene por objeto ayudarle a dar el primer paso para comprender la pérdida auditiva de su hijo/a y los recursos disponibles para él/ella y su familia. Las investigaciones demuestran claramente que la participación de los padres es fundamental para que los niños con pérdida auditiva tengan éxito tanto en su desarrollo lingüístico como educacional. Esta guía le entregará los conocimientos y recursos básicos que necesitará para navegar por el sistema de servicios de Iowa. En esta guía encontrará: • información sobre los profesionales que trabajarán con su hijo/a • información sobre apoyo familiar • opciones de educación y comunicación de su hijo/a • sus derechos y responsabilidades como padre o madre de un niño con sordera o con difi cultades auditivas • vínculos a otros recursos importantes • un glosario de nuevas palabras que necesita conocer

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Vibration-based damage identification (VBDI) techniques have been developed in part to address the problems associated with an aging civil infrastructure. To assess the potential of VBDI as it applies to highway bridges in Iowa, three applications of VBDI techniques were considered in this study: numerical simulation, laboratory structures, and field structures. VBDI techniques were found to be highly capable of locating and quantifying damage in numerical simulations. These same techniques were found to be accurate in locating various types of damage in a laboratory setting with actual structures. Although there is the potential for these techniques to quantify damage in a laboratory setting, the ability of the methods to quantify low-level damage in the laboratory is not robust. When applying these techniques to an actual bridge, it was found that some traditional applications of VBDI methods are capable of describing the global behavior of the structure but are most likely not suited for the identification of typical damage scenarios found in civil infrastructure. Measurement noise, boundary conditions, complications due to substructures and multiple material types, and transducer sensitivity make it very difficult for present VBDI techniques to identify, much less quantify, highly localized damage (such as small cracks and minor changes in thickness). However, while investigating VBDI techniques in the field, it was found that if the frequency-domain response of the structure can be generated from operating traffic load, the structural response can be animated and used to develop a holistic view of the bridge’s response to various automobile loadings. By animating the response of a field bridge, concrete cracking (in the abutment and deck) was correlated with structural motion and problem frequencies (i.e., those that cause significant torsion or tension-compression at beam ends) were identified. Furthermore, a frequency-domain study of operational traffic was used to identify both common and extreme frequencies for a given structure and loading. Common traffic frequencies can be compared to problem frequencies so that cost-effective, preventative solutions (either structural or usage-based) can be developed for a wide range of IDOT bridges. Further work should (1) perfect the process of collecting high-quality operational frequency response data; (2) expand and simplify the process of correlating frequency response animations with damage; and (3) develop efficient, economical, preemptive solutions to common damage types.