Matching Items (4)

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Impacts of Age on Neuropsychological Task Performance

Description

The purpose of this study was to test the reproducibility of the current data set. It was hypothesized that older adults’ scores on the Repeatable Battery for Assessment of Neuropsychological

The purpose of this study was to test the reproducibility of the current data set. It was hypothesized that older adults’ scores on the Repeatable Battery for Assessment of Neuropsychological Status (RBANS) would decrease from their initial visit to their one year follow-up visit and that greater overall age is associated with worse performance. Overall, the older adults with a follow-up visit in this study experienced greater decline on the RBANS DMI than on the RBANS total scaled score. There seems to be a negative trend in which individuals with higher first-visit VCI scores experience greater improvement on the first trial of the motor task with the non-dominant hand. The same trend can be seen in DMI scores where higher initial DMI scores are associated with greater improvement on the first non-dominant hand trial of the motor task. This initial trend suggests that visuospatial scores have an association with long-term change in the motor task. The number of participants in this data set were limited, thus more data will be needed to increase confidence in conclusions about these relationships in the future.

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Created

Date Created
  • 2021-05

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Recommendations of nursing interventions that promote development in chronically ill and hospitalized infants

Description

Hospitalized and chronically ill infants are at risk for motor, cognitive, and social developmental delays. Nurses have an important role in supporting infant and family development to mitigate these delays.

Hospitalized and chronically ill infants are at risk for motor, cognitive, and social developmental delays. Nurses have an important role in supporting infant and family development to mitigate these delays. A literature review was performed to identify nursing interventions that promote development in these three categories. After literature was selected, critical appraisals were performed to assess the quality of evidence. Breast feeding, early cognitive-motor intervention, and family centered care were found to be beneficial for promoting motor development. Maternal scaffolding, responsive-didactic caregiving, and skin-to-skin contact are recommended nursing interventions for cognitive development. Lastly, integration of music is the nursing intervention recommended to promote social development.

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Created

Date Created
  • 2021-05

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Standard Feeder and Load Model Synthesis Using Voltage and Current Measurements

Description

Until late 1970’s the primary focus in power system modeling has been largely directed towards power system generation and transmission. Over the years, the importance of load modeling grew and

Until late 1970’s the primary focus in power system modeling has been largely directed towards power system generation and transmission. Over the years, the importance of load modeling grew and having an accurate representation of load played an important role in the planning and operation studies. With an emphasis on tackling the topic of load modeling, this thesis presents the following intermediary steps in developing accurate load models:

1. Synthesis of a three-phase standard feeder and load model using the measured voltages and currents, for events such as faults and feeder pickup cases, obtained at the head of the feeder.

2. Investigated the impact of the synthesized standard feeder and load model on the sub-transmission system for a feeder pick-up case.

In the first phase of this project, a standard feeder and load model had been synthesized by capturing the current transients when three-phase voltage measurements (obtained from a local electric utility) are played-in as input to the synthesized model. The comparison between the measured currents and the simulated currents obtained using an electromagnetic transient analysis software (PSCAD) are made at the head of the designed feeder. The synthesized load model has a load composition which includes impedance loads, single-phase induction motor loads and three-phase induction motor loads. The parameters of the motor models are adjusted to obtain a good correspondence between measured three-phase currents and simulated current responses at the head of the feeder when subjected to events under which measurements were obtained on the feeder. These events include faults which occurred upstream of the feeder at a higher voltage level and a feeder pickup event that occurred downstream from the head of the feeder. Two different load compositions have been obtained for this feeder and load model depending on the types of load present in the surrounding area (residential or industrial/commercial).

The second phase of this project examines the impact of the feeder pick-up event on the 69 kV sub-transmission system using the obtained standard feeder and load model. Using the 69 kV network data obtained from a local utility, a sub-transmission network has been built in PSCAD. The main difference between the first and second phase of this project is that no measurements are played-in to the model in the latter case. Instead, the feeder pick-up event at a particular substation is simulated using the reduced equivalent of the 69 kV sub-transmission circuit together with the synthesized three-phase models of the feeder and the loads obtained in the first phase of the project. Using this analysis, it is observed that a good correspondence between the PSCAD simulated values of both three-phase voltages and currents with their corresponding measured responses at the substation is achieved.

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Agent

Created

Date Created
  • 2018

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Small-scale hybrid rocket test stand & characterization of swirl injectors

Description

Derived from the necessity to increase testing capabilities of hybrid rocket motor (HRM) propulsion systems for Daedalus Astronautics at Arizona State University, a small-scale motor and test stand were designed

Derived from the necessity to increase testing capabilities of hybrid rocket motor (HRM) propulsion systems for Daedalus Astronautics at Arizona State University, a small-scale motor and test stand were designed and developed to characterize all components of the system. The motor is designed for simple integration and setup, such that both the forward-end enclosure and end cap can be easily removed for rapid integration of components during testing. Each of the components of the motor is removable allowing for a broad range of testing capabilities. While examining injectors and their potential it is thought ideal to obtain the highest regression rates and overall motor performance possible. The oxidizer and fuel are N2O and hydroxyl-terminated polybutadiene (HTPB), respectively, due to previous experience and simplicity. The injector designs, selected for the same reasons, are designed such that they vary only in the swirl angle. This system provides the platform for characterizing the effects of varying said swirl angle on HRM performance.

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Created

Date Created
  • 2013