Experimental validation of boundary element methods for noise prediction

Experimental validation of methods to predict radiated noise is presented. A combined finite element and boundary element model was used to predict the vibration and noise of a rectangular box excited by a mechanical shaker. The predicted noise was compared to sound power measured by the acoustic intensity method. Inaccuracies in the finite element model shifted the resonance frequencies by about 5 percent. The predicted and measured sound power levels agree within about 2.5 dB. In a second experiment, measured vibration data was used with a boundary element model to predict noise radiation from the top of an operating gearbox. The predicted and measured sound power for the gearbox agree within about 3 dB

Impedance measurement using a two-microphone, random-excitation method

The feasibility of using a two-microphone, random-excitation technique for the measurement of acoustic impedance was studied. Equations were developed, including the effect of mean flow, which show that acoustic impedance is related to the pressure ratio and phase difference between two points in a duct carrying plane waves only. The impedances of a honeycomb ceramic specimen and a Helmholtz resonator were measured and compared with impedances obtained using the conventional standing-wave method. Agreement between the two methods was generally good. A sensitivity analysis was performed to pinpoint possible error sources and recommendations were made for future study. The two-microphone approach evaluated in this study appears to have some advantages over other impedance measuring techniques

The Impact of Digital Marketing Tactics on the Recruitment of Domestic First-Generation College Students in the Southwest United States

In 2015, 36% of first-time freshmen applied to more than seven colleges or universities. In 2005, this figure was 17% (Soodik, 2017). This study assesses email and text messaging digital marketing touchpoints in the recruitment and matriculation of first-generation college students at a private, four-year institution in the southwest region of the United States of America and is a member of the Council for Christian Colleges and Universities (CCCU). In chapter two of this dissertation, the research explores the history of student college choice theories and examines the ways in which the original theory has changed throughout the years. Ultimately the study found that there was a positive relationship between text messaging and enrollment decisions which was nine times stronger than the relationship between email (B = 0.018 vs. B = 0.002). However, when text messages sent and replied to and email were compared in a regression, emails ceased to have a significant relationship (p = 0.078) with matriculation, as shown in Table 17. The dissertation concludes with areas for future research and areas for application to the enrollment marketing profession

Marshall University Music Department Presents the Belle & Lynum Jackson Competition Winner\u27s Recital, Austin Seybert, trombone

https://mds.marshall.edu/music_perf/1550/thumbnail.jp

The Impact of Digital Marketing Tactics on the Recruitment of Domestic First-Generation College Students in the Southwest United States

In 2015, 36% of first-time freshmen applied to more than seven colleges or universities. In 2005, this figure was 17% (Soodik, 2017). This study assesses email and text messaging digital marketing touchpoints in the recruitment and matriculation of first-generation college students at a private, four-year institution in the southwest region of the United States of America and is a member of the Council for Christian Colleges and Universities (CCCU). In chapter two of this dissertation, the research explores the history of student college choice theories and examines the ways in which the original theory has changed throughout the years. Ultimately the study found that there was a positive relationship between text messaging and enrollment decisions which was nine times stronger than the relationship between email (B = 0.018 vs. B = 0.002). However, when text messages sent and replied to and email were compared in a regression, emails ceased to have a significant relationship (p = 0.078) with matriculation, as shown in Table 17. The dissertation concludes with areas for future research and areas for application to the enrollment marketing profession

School Counseling at Hansen Elementary

Over the course of the spring semester, I partnered with Hansen Elementary to fulfill my Psychology Cooperative Education internship. While there, I worked closely with the school counselor (Jen Alexander) to teach children K-6 about things such as emotional well-being, conflict resolution, making goals, and building healthy, lasting relationships. As one of the interns, I was able to meet with students one-on-one as well as assist faculty in classroom lessons. My role at Hansen Elementary has opened my eyes to the world of school counseling and has inspired me to pursue a career in the field

The Relationship Between Colorado Teacher Salary and Colorado Teacher Turnover

This secondary research study used quantitative research methods to gather and analyze statistical data on specific factors that have been demonstrated to impact teacher retention and assessed their relative importance in impacting teacher turnover. The data utilized for this study were peer-reviewed, publicly available, government data collected by the Colorado Department of Education. The time period examined in this study was the school years of 2015-2019. The study found teacher salary was a significant determinant of teacher retention in Colorado. When controlling for other potentially important factors, such as academic performance, English language learners, socioeconomic status, minority students, and setting of school district, the study found a $1,000 increase in teacher salary was associated with a .25% decrease in teacher turnover. The study also found that teacher salary was more important for retaining teachers than other factors. Some factors that still had an impact on teacher turnover were socio-economic status of the student population, academic performance, and the region in Colorado in which a district was located. The study\u27s findings are important for policymakers and school administrators who are interested in reducing teacher turnover in Colorado. The study\u27s findings suggested that increasing teacher salary was one way to reduce teacher turnover but districts should also consider other factors when developing strategies to retain teachers

How Intervention Techniques Altered and Affected Various Teacher and Student Behaviors in a Physical Education Class with the Use of a Mentor Teacher

Teaching behavior was assessed in this study over a period of two months in an elementary physical education setting. One non-certified physical education teacher served as the subject. The subject’s teaching behaviors were recorded during eight forty-five minutes classes. The eight sessions were broken down into four cycles with two observations per cycle. Each observation was followed with feedback from the investigator on problem areas. The subject was given suggestions for improvement. Data was accumulated through the use of the Arizona State University Observation Instrument. Variables recorded included event recording for (a) use of first names, (b) pre-instruction, (c) concurrent instruction, (d) post instruction, (e) questioning, (f) positive modeling, (g) negative modeling, (h) hustle, (i) praise, (j) scold, (k) management, and it included duration recording for (a) management time, (b) instruction time, (c) engagement time, and (d) wait time. An ANOVA procedure was utilized to assess the effectiveness of mentoring. Significant differences were also found between the cycles for the categories of praise and post instruction. There was a significant decrease in the use of praise and the use of post instruction throughout the cycles. Significant difference was also found for the teaching behavior category of management. Significantly fewer management comments were made from cycle one to cycle two, three and four

Preliminary Investigation for the Development of Surrogate Debris from Nuclear Detonations in Marine-Urban Environments

No nuclear weapon has ever been detonated in a United States city. However, this also means the nuclear forensic community has no actual debris from which to develop analytical methods for source attribution, making the development of surrogate nuclear debris a vital undertaking. Moreover, the development of marine-urban debris presents an unusual challenge because unlike soil and urban structures, which remain compositionally consistent, the elemental composition of harbor and port waters fluctuates considerably due to natural phenomenon and human activity. Additionally, marine vessel composition and cargo can vary dramatically. While early US nuclear tests were carried out in shallow-water coastal areas, they did not represent the marine-urban environments of large cities and any residual debris will be ill suited for the development of modern forensic techniques. Given these technical complexities, it is critical to understand the environmental variations in order to develop realistic surrogate nuclear marine-urban debris. This project seeks to build a robust model for the New York/New Jersey harbor, the Port of Houston, and the Long Beach/Los Angeles harbor that statistically define the elemental composition of vaporized debris for follow-on neutron-activation and debris formation analysis. Analysis of these neutron and fractionation effects will support the development of unique surrogate debris samples that mimic the elemental content of actual nuclear debris from a marin-eurban detonation. These samples can then be utilized for the development of the analytical methods for post-detonation analysis and attribution