Digital Commons Network^™

Gas-Liquid Mass Transfer In A High Pressure Bubble Column Reactor With Different Sparger Designs, Lu Han, Muthanna H. Al-Dahhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

The Gas-Liquid Mass Transfer in a 0.162 M High-Pressure Stainless-Steel Bubble Column Was Investigated using Three Different Gas Sparger Designs. an Oxygen-Enriched-Air Dynamic Method and an Optical Oxygen Probe Technique Were Implemented to Measure K1 a Values in the Bubble Column Reactor. using the Interfacial Area (A) Values Measured by a Four-Point Optical Probe Technique at Similar Conditions (Xue, 2004), the K1 Values Were Estimated. Axial Dispersion Model (ADM) and Continuous Stirred Tank Reactor (CSTR) Model Were Used to Calculate K1 a as a Fitted Parameter with the Measured Data. the ADM Gave Better Fits to the Experimental Data Than …

Adaptive Power Control Protocol With Hardware Implementation For Wireless Sensor And Rfid Reader Networks, Kainan Cha, Jagannathan Sarangapani, David Pommerenke

Electrical and Computer Engineering Faculty Research & Creative Works

The development and deployment of radio frequency identification (RFID) systems render a novel distributed sensor network which enhances visibility into manufacturing processes. In RFID systems, the detection range and read rates will suffer from interference among high-power reading devices. This problem grows severely and degrades system performance in dense RFID networks. Consequently, medium access protocols (MAC) protocols are needed for such networks to assess and provide access to the channel so that tags can be read accurately. In this paper, we investigate a suite of feasible power control schemes to ensure overall coverage area of the system while maintaining a …

Design Of An Fpga Logic Element For Implementing Asynchronous Null Convention Logic Circuits, Scott C. Smith

Electrical and Computer Engineering Faculty Research & Creative Works

Two versions of a reconfigurable logic element are developed for use in constructing afield-programmable gate array NULL convention logic (NCL) field-programmable gate array (FPGA): one with extra embedded registration capability, which requires additional area, and one without. Both versions can be configured as any of the 27 fundamental NCL gates, including resettable and inverting variations, and both can utilize embedded registration for gates with three or fewer inputs; however, only the version with the additional embedded registration capability can utilize embedded registration with four-input gates. These two approaches are compared with each other and with an existing approach, showing that …

Doppler Spread Estimation For Broadband Wireless Ofdm Systems, Jun Tao, Jingxian Wu, Chengshan Xiao

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, we present a new Doppler spread estimation algorithm for broadband wireless orthogonal frequency division multiplexing (OFDM) systems with time-varying and frequency-selective Rayleigh fading. The algorithm is developed by analyzing the statistical properties of the power of received signals in the time domain, thus it excludes the influence of inter- carrier interference introduced by channel variation within one OFDM symbol. The operation of the algorithm doesn't require the knowledge of fading coefficients, transmitted data symbols, or signal-to-noise ratio (SNR). It works well under time-selective and frequency-selective Rayleigh fading channel with SNR as low as 0 dB. Moreover, unlike …

Route Aware Predictive Congestion Control Protocol For Wireless Sensor Networks, Carl Larsen, Maciej Jan Zawodniok, Jagannathan Sarangapani

Electrical and Computer Engineering Faculty Research & Creative Works

Congestion in wireless sensor networks (WSN) may lead to packet losses or delayed delivery of important information rendering the WSN-based monitoring or control system useless. In this paper a routing-aware predictive congestion control (RPCC) yet decentralized scheme for WSN is presented that uses a combination of a hop by hop congestion control mechanism to maintain desired level of buffer occupancy, and a dynamic routing scheme that works in concert with the congestion control mechanism to forward the packets through less congested nodes. The proposed adaptive approach restricts the incoming traffic thus preventing buffer overflow while maintaining the rate through an …

What Happens When Veteran And Beginner Teachers' Life Histories Intersect With High-Stakes Testing And What Does It Mean For Learners And Teaching Practice: The Making Of A Culture Of Fear, Shelly L. Counsell

Dissertations and Theses @ UNI

This qualitative study explored the phenomenon of what happened as Florida's high-stakes accountability system intersected with a beginning and veteran teachers' life histories and different stocks of lifeworldly knowledge at demographically different lifeworld communities. Habermas' (1987) theory of communicative action was used as the theoretical framework to explore what the teachers' responses meant for learners and teaching practice. The research purpose of this study (emphasizing an interpretive approach) sought to gain insights and understandings regarding the phenomenon specifically. The practical purpose (according to critical theory) was to then use the insights gained (enlightenment) in order to contemplate the kinds of …

Guess Who's Not Coming To Dinner: A Review Of The Policies And Practices In Three Urban Iowa School Districts To Recruit Teachers From Underrepresented Backgrounds, Willie B. Barney

Dissertations and Theses @ UNI

Although student diversity in public schools has increased at a rapid pace, teacher diversity has not matched the student pace. Schools in the United States have had a difficult time identifying strategies for the effective recruitment and hire of teachers from ethnically underrepresented backgrounds. The shortage has left many questioning the merit of their efforts.

The purpose of this study was to identify the steps taken by Iowa's urban school districts to recruit and hire teachers from ethnically underrepresented backgrounds. Four research questions were examined using a qualitative research methodology. Using inquiry techniques, school district personnel participated in individual interviews …

The Role Of Spirituality In Women's Leadership At Community Colleges, Carol L. Hedberg

Dissertations and Theses @ UNI

This qualitative research study examined the role of women's leadership in Iowa community colleges. Administrative leaders from community college settings, recommended by their presidents, wrote narratives about effective leadership traits and from these narratives, four women leaders were selected and later interviewed. Key thematic categories were developed from the written and verbal narratives. The resulting data set was then analyzed by a comparative case study approach. Emerging thematic categories were interpreted through the lens of four primary research questions addressing the relationship between gender, spirituality, and authentic leadership.

A plethora of issues surfaced from the data. Issues of gender and …

Pieces To The Puzzle, Ann L. Cracco

Dissertations and Theses @ UNI

Because low-income, first-generation, and disabled individuals have limited access to postsecondary education, Congress established TRIO, a series of programs designed to provide access to college for this targeted population. One initiative suggested to aid in retention and graduation for these TRIO students was mentoring. This study examined the perceived benefits of faculty mentoring for first-generation TRIO students to facilitate retention and graduation rates at a Midwestern Community College. Three faculty members and three TRIO students were interviewed to determine their perception of the benefits of faculty mentoring. The results were consistent with the literature that students who have access to …

Approaches To Studying And Study Tactics Of Baccalaureate Nursing Students, Lisa D. Brodersen

Dissertations and Theses @ UNI

This research was designed to describe study approaches and study tactics used by baccalaureate nursing students. Previous inquiry indicates that students will take a Deep, Strategic, or Surface approach to studying and will use specific study tactics to meet the demands of their learning contexts.

The Approaches to Study Skills Inventory for Students (ASSIST) was administered to 174 students in Anatomy and Physiology, Pathophysiology, and Nursing Care of the Adult Client. Failing students were less likely to participate. The ASSIST bad acceptable internal consistency reliability and construct validity. A majority (55%) of students took a Strategic approach to studying; smaller …

Identifying Behavioral Characteristics Of High School Principals Providing Leadership In Reforming Iowa High Schools, Nadene E. Davidson

Dissertations and Theses @ UNI

Technological advances and the changing world have created new challenges in preparing our youth to lead satisfying lives in the twenty-first century. Current literature supports the case that change is needed in our high schools to move from the factory preparation model to become more personalized learning communities preparing students for life in a global community. This reinvented high school will require reinvented leadership to guide the process of high school reform. The purpose of this study was to identify behavioral characteristics of high school principals providing leadership in reforming Iowa high schools.

Interviews were conducted with educators from two …

A Study Of Elementary Instructors' Teaching Of Forearm Passing As A Part Of Volleyball Instruction, Tsui-Feng Tiffany Yeh

Dissertations and Theses @ UNI

The purpose of this study was to investigate the teaching of forearm passing as a key component of volleyball game performance. More specifically, this study investigated teachers' content knowledge and teaching knowledge (pedagogical content knowledge) related to forearm passing as described by the teachers and manifested in teaching practices in the teaching environment.

Six elementary physical education instructors participated in this study. Several methods were used for gathering different information about forearm passing research including systematic observation, videotaping, field notes, and formal and informal interviews.

The findings revealed that (a) teachers' teaching philosophy significantly influenced their teaching and designing volleyball …

How The Clinical Settings Of Radiography Programs Affect Learning Perceptions, Peggy Fortsch

Dissertations and Theses @ UNI

A main purpose of clinical education is to prepare practitioners who can deliver excellent skills and care vital to the health and safety of persons in their care and to society. Clinical education is an essential component for students pursuing careers as health care providers. The purpose of this study was to examine the place of clinical experiences in radiography programs and to describe how students and clinical instructors in three different radiography program models (bridging, external, and internal) perceived the learning experiences in clinical settings.

From the perspectives of students and clinical instructors the following questions were addressed:

(1) …

Significance Of The General Public For Public Relations: A Study Of The Blogosphere's Impact On The October 2006 Edelman/Wal-Mart Crisis, Sergei Golitsinski

Dissertations and Theses @ UNI

The focus of this study is the general public and its significance in a public relations context. The study questions one of the fundamental principles of public relations, according to which organizations communicate only with those publics which have the potential to cause them negative consequences. The general public, according to -this principle, is considered insignificant and even nonexistent. This study's hypothesis is that new communication technologies have given the general public the power to cause direct negative consequences for organizations. To evaluate this hypothesis, the study examines the October 2006 Edelman/Wal-Mart crisis caused by the "Wal-Marting Across America" blog. …

The Effects Of Facial Attractiveness, Weight, And Immediacy On Social Influence: A Test Of Dynamic Social Impact, Melinda Bullock

Dissertations and Theses @ UNI

Social impact theory (Latane, 1981) explains social influence as a multiplicative function of strength, immediacy, and number. Dynamic social impact theory (Latane, 1996a) states that four phenomena occur as a result of social influence: a) clustering (those living close together have similar attitudes), b) correlation (once unrelated attitudes become associated), c) consolidation (reduction in overall attitude variance), and d) continuing diversity (in spite of social influence attitudes diversity persists). This study used these two theories to examine how facial attractiveness, weight, and immediacy affect social influence. It. was expected that clustering, correlation, and consolidation would occur to a greater extent …

Tree Species Identification In An Urban Environment Using A Data Fusion Approach, Matthew A. Voss

Dissertations and Theses @ UNI

This thesis explores a data fusion approach combining hyperspectral, LiDAR, and multispectral data to classify tree species in an urban environment. The study area is the campus of the University of Northern Iowa.

In order to use the data fusion approach, a wide variety of data was incorporated into the classification. These data include: a four-band Quickbird image from April 2003 with 0.6m spatial resolution, a 24-band AISA hyperspectral image from July 2004 with 2m spatial resolution, a 63-band AISA Eagle hyperspectral image from October 2006 with lm spatial resolution, a high resolution, multiple return LiDAR data set from April …

Performance Analysis Of Wireless Systems With Doubly Selective Rayleigh Fading, Jingxian Wu, Chengshan Xiao

Electrical and Computer Engineering Faculty Research & Creative Works

Theoretical error performances of wireless communication systems suffering from both doubly selective (time varying and frequency selective) Rayleigh fading and sampler timing offset are analyzed in this paper. Single-input-single-output systems with doubly selective fading channels are equivalently represented as discrete-time single-input-multiple-output (SIMO) systems with correlated frequency-flat fading channels, with the correlation information being determined by the combined effects of sampler timing phase, maximum Doppler spread, and power delay profile of the physical fading. Based on the equivalent SIMO system representation, closed-form error-probability expressions are derived as tight lower bounds for linearly modulated systems with fractionally spaced equalizers. The information on …

Hydro-Nexrad Radar-Rainfall Estimation Algorithm Development, Testing And Evaluation, Witold F. Krajewski, Bong Chul Seo, Anton Kruger, Piotr Domaszczynski, Gabriele Villarini, Charles Gunyon

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The Hydro-NEXRAD radar-rainfall estimation algorithms involve three main components: 1) preprocessing, 2) rain rate, and 3) rainfall accumulation. The preprocessing algorithm performs the quality control of reflectivity volume data and generates a hybrid scan. That is, reflectivity values for each azimuth and range bin are assigned from the several lowest elevation angles. It optionally estimates an azimuth-dependent vertical reflectivity profile and performs a correction for range effects. The rain rate algorithm converts the corrected reflectivity to rainfall intensity. The user can specify any power-law type empirical relationship between reflectivity and rainfall intensity. The last step of rainfall estimation is to …

Towards Better Utilization Of Nexrad Data In Hydrology: An Overview Of Hydro-Nexrad, Witold F. Krajewski, Anton Kruger, Ramon Lawrence, James A. Smith, A. Allen Bradley, Matthias Steiner, Mary Lynn Baeck, Mohan K. Ramamurthy, Jeffrey Weber, Stephen A. Delgreco, Bong Chul Seo, Piotr Domaszczynski, Charles Gunyon, Radoslaw Goska

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

With a very modest investment in computer hardware and the open-source local data manger (LDM) software from UCAR's Unidata Program Center, an individual researcher can receive a variety of NEXRAD Level III gridded rainfall products, and the unprocessed Level II data in real-time from most NEXRAD radars. Additionally, the National Climatic Data Center has vast archives of these products and Level II data. Still, significant obstacles remain in order to unlock the full potential of the data. One set of obstacles is related to effective management of multi-terabyte data sets: storing, compressing, and backing up. A second set of obstacles, …

Mediating The Cultivation Of Fear Through Media Literacy Education, Catherine N. Collins, Kristine L. Slank

Modern Psychological Studies

College students (N = 110) received a media literacy intervention based on critical thinking or they received no intervention. Students were also classified as low or high television viewers based on responses to a Television Use Survey. Fear was measured with a Safety Survey and analyzed with a 2 Intervention x 2 Television Viewing ANOVA. Fear was expected to be lower in the intervention and low television viewing groups than in the no intervention and high television viewing groups. However, no results were significant.

Learning Cycles In The Biology Classroom, Christine Winstead

Graduate Research Papers

No abstract provided.

Play Behaviors On Outdoor Play Structures, Angela Dawn Rodriquez

Graduate Research Papers

The purpose of this study was to assess children's free play preferences on outdoor play structures. Many contemporary children are not merely deprived of play but are essentially deprived of the healthiest and richest forms of play. The richest forms are described by children as the most fun, the most exciting, the most interesting, and by theorists and writers are described as "deep play". Deep play is defined as nonliteral behavior, and a transformation of reality Mannell, & Klieber, 1997. This study focused on children's social, cognitive and non-play behaviors that they participated in on play structures.

These deep play …

Laboratory Schools Annual Report, 2006-2007, Laboratory Schools, Illinois State University

Annual Reports – Laboratory Schools

Illinois State University Laboratory Schools annual report

An Experimental Analysis Of Activist Message Strategy Effect On Receiver Variables, Andrea Schuch

USF Tampa Graduate Theses and Dissertations

Utilizing communication and activist organization perspectives, this empirical study examined activist message strategies and how they influence variables related to the receiver of activist communication. Specifically, J.E. Grunig's (1997) situational theory of publics and Fishbein and Ajzen's (1975) theory of reasoned action were used to explain the communication effects of the seven activist message strategies developed from Hazleton and Long's (1988) public relations process model. The findings of this study support the premise of situational theory of publics and contribute to the extension of the theory through the inclusion of goal compatibility as a predictor of information seeking behavior and …

Cellular Electrofusion Utilizing Corona Fields And Dc Pulse Technology, Joshua Stein

USF Tampa Graduate Theses and Dissertations

Cell fusion is an important technique that is used in the field of medicine and biomedical research. For instance, fusion can be used to create hybridomas and novel types of secretory hybrid cells. It may also be used to engineer cultured insulin-secreting pancreatic B-cell lines for the treatment of diabetes. Historically, the applications listed above have been accomplished by a number of methodologies including dielectrophoresis, centrifugation, polyethylene glycol (PEG) and viral fusion proteins. However, these approaches often fail to produce the desired results due to poor cell viability, lack of 1:1 fusion, and use of non-physiological environments. It is proposed …

Life As A Student At An Independent Day School, Diana R. Torres

USF Tampa Graduate Theses and Dissertations

This study explores the interconnectedness of social class, education, and cultural capital. Considered academically elite, the independent school is be an ideal environment to find increased instances and opportunities for the acquisition and reproduction of elite, or "dominant" cultural capital. By implementing an ethnographic approach within an independent school setting, this study attempts to illuminate the student experience through adolescents' eyes. Past cultural capital studies focus on the relationship between cultural capital and academic achievement and/or social reproduction; instead, this study focuses on the everyday student experiences as they point to potential indicators of cultural capital. Results suggest that students' …

Technology And Older Faculty: A Descriptive Study Of Older Florida Community College Faculty, Christopher D. Van Der Kaay

USF Tampa Graduate Theses and Dissertations

Institutions of higher learning across the United States are experiencing an aging faculty population. A significant proportion of college and university faculty are over 55, a growth expected to continue in future years. Parallel to this growth and change has been an expanding use of technology in higher education. Despite this trend and potential implications, few studies have provided in-depth insight into older faculty and technology. The study used a quantitative descriptive design to provide a comprehensive look at older community college faculty and various aspects of technology. Areas examined included older faculty's perceptions of technology, their attitudes toward institutional …

What The Spirit Knows: Charles Williams And Kenneth Burke, Grace Veach

USF Tampa Graduate Theses and Dissertations

What the Spirit Knows: Charles Williams and Kenneth Burke examines the Arthurian poetry of Charles Williams using a methodology derived from Kenneth Burke. This is an experiment in literary criticism of a Christian poet using a methodology that is not specifically Christian. Key critical ideas found in Burke are utilized in reading poems from Taliessin Through Logres and Region of the Summer Stars. Burke's work on form and symbol (primarily from Counter-Statement) is addressed first. Form in an individual poem (using "Taliessin's Song of the Unicorn) and in an entire cycle is examined. Burke lists several uses for symbol in …

Online Delivery Of Career Choice Interventions: Preferences Of First-Year Students In Higher Education, Melissa Venable

USF Tampa Graduate Theses and Dissertations

Career services professionals are increasingly involved in decisions regarding the use of technology to perform their jobs. The millennial generation, increasingly enrolling in distance education, is characterized as being comfortable with technology, expecting efficient services, and valuing convenience. Understanding the technology-related preferences of today's students is fundamental for those planning and developing student career services. Brown and Ryan Krane (2000) identified five critical interventions important to career decision-making: (a) Written Exercises, (b) Individualized Interpretations and Feedback, (c) Information on the World of Work, (d) Modeling, and (e) Attention to Building Support.

This study investigated the following questions: (1) what are …

Effect Of A Preoperative Warming Intervention On The Acute Phase Response Of Surgical Stress, Vanda Doreen Wagner

USF Tampa Graduate Theses and Dissertations

When a patient is exposed surgical stress, the endocrine system secretes hormones in response to that stress. These hormones further activate the immune system to release cytokines and other acute phase reactions. These processes are supposed to protect the body by upregulating the innate immune system and producing an inflammatory response that acts to protect and heal. However, uncontrolled surgical stress may cause a weaker immune response that may lead to delayed wound healing. The phenomenon of unplanned perioperative hypothermia is known to expose patients to additional surgical stress. The purpose of this preliminary experimental study was to determine the …