Digital Commons Network^™

The Error Control Of Mixed-Form Fast Multipole Algorithm Based On The High-Order Multipole Rotation, Ling Ling Meng, Xiaoyan Y.Z. Xiong, Tian Xia, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

In this letter, the mixed-form fast multipole algorithm (MF-FMA) with feasible error controllability is implemented through high-order multipole rotation that can make the translation matrices very sparse. The saving of both storage and CPU time makes it attainable to increase the number of harmonics in the middle frequency regime, thus shifting up the transition region of MF-FMA. Consequently, the broadband accuracy of the MF-FMA can be improved significantly.

Low Frequency Behavior Of Cvd Graphene From Dc To 40 Ghz, Rong Wang, Salahuddin Raju, Mansun Chan, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

Electromagnetic behaviour of chemical vapor deposition (CVD) graphene at low frequencies is still a mystery. No conclusion is made from the experimental point of views. We systematically investigate the electromagnetic response of graphene at microwave frequencies, which are from direct current (DC) to 40 GHz. Both a coplanar transmission line embedded with different-sized graphene flakes of 48 x 48 and 48 x 240 μm2 and a microwave termination based on the graphene sheet of 6 x 6mm2 are manufactured through standard microfabrication procedures. We conclude that CVD graphene behaves as a frequency-independent surface resistance at the microwave frequencies, which is …

Ultrathin Complementary Metasurface For Orbital Angular Momentum Generation At Microwave Frequencies, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Wei E.I. Sha

Electrical and Computer Engineering Faculty Research & Creative Works

Electromagnetic (EM) waves with helical wave front carry orbital angular momentum (OAM), which is associated with the azimuthal phase of the complex electric field. OAM is a new degree of freedom in EM waves and is promising for channel multiplexing in the communication system. Although the OAM-carrying EM wave attracts more and more attention, the method of OAM generation at microwave frequencies still faces challenges, such as efficiency and simulation time. In this communication, by using the circuit theory and equivalence principle, we build two simplified models, one for a single scatter and one for the whole metasurface to predict …

Volterra Series-Based Time-Domain Macromodeling Of Nonlinear Circuits, Xiaoyan Y.Z. Xiong, Li (Lijun) Jun Jiang, Jose E. Schutt-Aine, Weng Cho Chew

Electrical and Computer Engineering Faculty Research & Creative Works

Volterra series (VS) representation is a powerful mathematical model for nonlinear circuits. However, the difficulties in determining higher order Volterra kernels limited its broader applications. In this paper, a systematic approach that enables a convenient extraction of Volterra kernels from X-parameters is presented. A concise and general representation of the output response due to arbitrary number of input tones is given. The relationship between Volterra kernels and X-parameters is explicitly formulated. An efficient frequency sweep scheme and an output frequency indexing scheme are provided. The least square linear regression method is employed to separate different orders of Volterra kernels at …

Synthesis Of Low-Coordinate Transition Metal Bis(Alkoxide) Complexes And Their Reactivity Toward Small Molecules, Maryam Yousif

Wayne State University Dissertations

This dissertation focused on the synthesis of new transition metal complexes in bis(alkoxide) ligand environments and the investigation of their reactivity in nitrene-group transfer catalysis and small molecule activation. Treatment of Cr(N(SiMe3)2)2(THF)2 with two equivalents of HOR (OR = OCtBu2Ph) led to the formation of the chromium(II) alkoxide dimer, Cr2(OR)4. Upon the reaction with bulky aryl and alkyl azides, Cr2(OR)4 led to the stable Cr(IV) mono(imido) complexes, Cr(OR)2(NR), featuring trigonal planar metal centers. In contrast, less bulky aryl azides led to the formation of chromium (VI) bis(imido) complexes Cr(OR)2(NR)2, independent of the amount of azide used. Chromium(IV) mono(imido) species Cr(OR)2(NR) …

Delivery Of Usaid Aid To Afghanistan, 2001-2017, Abdullah Fayez Bataineh

Wayne State University Dissertations

ABSTRACT

DELIVERY OF USAID AID IN AFGHANISTAN, 2001-2017

by

ABDULLAH BATAINEH

May 2018

Advisor: Dr. Nadejda Marinova

Major: Department of Political Science

Degree: Doctor of Philosophy

Afghanistan is currently foreign aid dependent. The US Agency for International Development (USAID) has allocated over 100 billion US dollars since 2001 for the development and modernization of Afghanistan. The United States has invested over 700 billion US dollars overall. There is a breakdown or a problem in USAID funding for Afghanistan, whereas not all the money allocated was utilized for intended purposes. Today Afghanistan remains a LDC, a least developed country, with extensive …

Probabilistic Analysis And Verification Framework For Adaptive Flight Control, Mario Luca Fravolini, Tansel Yucelen, Marcello Napolitano

Mechanical and Aerospace Engineering Faculty Research & Creative Works

A crucial aspect that could facilitate the applications of adaptive control systems in aerospace applications is the development of effective validation and verification procedures. Most of the existing analysis and design frameworks for adaptive controllers are based on the Lyapunov direct method. One well-known drawback of this approach is the conservatism in the estimation of the uniform ultimate boundedness region with little practical utility. To overcome this limitation, a probabilistic framework for the design of uniform ultimate boundedness regions is proposed where uncertain parameters and adaptive controls are considered as random variables. In this framework, the design is translated into …

Development Of A Health Care Systems Curriculum., Zachary Pruitt, Rahul Mhaskar, Bryan G. Kane Md, Robert D. Barraco Md, Mph, Deborah J Dewaay, Alexander M. Rosenau Do, Kristin A. Bresnan Md, Marna R. Greenberg Do, Mph, Facep

Department of Emergency Medicine

Background: There is currently no gold standard for delivery of systems-based practice in medical education, and it is challenging to incorporate into medical education. Health systems competence requires physicians to understand patient care within the broader health care system and is vital to improving the quality of care clinicians provide. We describe a health systems curriculum that utilizes problem-based learning across 4 years of systems-based practice medical education at a single institution.

Methods: This case study describes the application of a problem-based learning approach to system-based practice medical education. A series of behavioral statements, called entrustable professional activities, was created …

Review—The Current And Emerging Applications Of The Iii-Nitrides, Chuanle Zhou, Amirhossein Ghods, Vishal G. Saravade, Paresh V. Patel, Kelcy L. Yunghans, Cameron Ferguson, Yining Feng, Bahadir Kucukgok, Na Lu, Ian T. Ferguson

Electrical and Computer Engineering Faculty Research & Creative Works

III-Nitrides are attracting considerable attention as promising materials for a wide variety of applications due to their wide coverage of direct bandgap range, high electron mobility, high thermal stability and many other exceptional properties. The light-emitting diodes based on III-Nitrides revolutionize the solid-state lighting industry. III-Nitrides based solar cells, and thermoelectric generators support the sustainable energy progress, and the III-Nitrides are better alternatives for power and radio frequency (RF) electronics compared with silicon. The doped III-Nitrides' magnetic properties and sensitivity to radiation can contribute to novel spintronic and nuclear detection devices. This paper will review III-nitride material properties and their …

Womb Heat Versus Sperm Heat: Hippocrates Against Galen And Ibn Sīnā In Ibn Al- Nafīs’S Commentaries, Nahyan Fancy

History Faculty publications

Ibn al-Nafīs wrote lemmatic commentaries on Hippocrates’ Aphorisms and Ibn Sīnā’s entire Canon of Medicine. While he regularly challenges, critiques and refutes Ibn Sīnā’s positions in his Commentary on the Canon, Ibn al-Nafīs generally upholds the validity of each aphorism. This already suggests that he considered Hippocrates the supreme authority in medicine over Ibn Sīnā (and even Galen). Through an analysis of his commentary on Aphorisms V.42 and V.48 (on the causes and consequences of bearing male children), and how he deploys them in his commentary on the analogous chapters from the Canon, we shall see how Ibn al-Nafīs establishes …

Accumulating Risk: Environmental Justice And The History Of Capitalism In Detroit, 1880-2015, Josiah John Rector

Wayne State University Dissertations

This dissertation is an environmental history of Detroit, Michigan from the 19th century to the present. Recent scholarship on the history of capitalism has largely ignored the problem of environmental inequality, and the negative externalities of economic growth. In contrast, studies of the environmental justice movement have richly documented race, class, and gender inequalities in environmental risk exposure. However, they have neglected the relationship between the development of the environmental justice movement and the restructuring of American capitalism since the 1970s, including deindustrialization and the shift to neoliberalism. Bringing these fields together, this dissertation connects Detroit’s long-term economic transformation to …

Family Consultation To Reduce Early Hospital Readmissions Among Patients With End-Stage Renal Disease: A Randomized Clinical Trial, Matthew James Jasinski

Wayne State University Dissertations

Background: The U.S. Centers for Medicare and Medicaid Services have mandated reducing early hospital readmissions (i.e., within 30 days of discharge) to both improve patient care and reduce expenses. Patients with end-stage renal disease (ESRD) have relatively high early readmission rates, due in part to their complex medical regimens but also cognitive impairment, health literacy problems, and lack of social support. We developed a brief family consultation intervention to address these problems and tested its ability to reduce early readmissions among patients with ESRD.

Method: 120 hospitalized adults with ESRD (M age = 57.5 years; 50% male; 86% Black, 12% …

Silicon Carbide Based Surface Plasmon Resonance Waveguide Sensor With A Bimetallic Layer For Improved Sensitivity, Wei Du, Feng Zhao

Electrical and Computer Engineering Faculty Research & Creative Works

In this letter, silicon carbide (SiC) waveguide-based surface plasmon resonance optical sensor with an Ag-Au bilayer metal configuration was studied. The wide bandgap energy of SiC allows the sensor to operate in visible and near-infrared range. The spectrum of resonant wavelength with refractive index shows improved sensitivity and sensing resolution in the Au-Ag bilayer configuration than in the single Au layer configuration. A sensitivity of 2581 nm/RIU (refractive index unit) indicated by the shift of resonant wavelength with refractive index was observed from a refractive index range of n=1.34–1.36, showing that the sensor is desirable for sensing in a series …

Filamentary Conduction In Aloe Vera Film For Memory Application, Zhe Xi Lim, Sasidharan Sreenivasan, Yew Hoong Wong, Feng Zhao, Kuan Yew Cheong

Electrical and Computer Engineering Faculty Research & Creative Works

Aloe vera gel was extracted, formulated and deposited as thin films by a facile solution process for memory application. The memory cell features a simple structure, in which a dried Aloe vera film was sandwiched in between an Ag top and ITO bottom electrode that was deposited on a glass substrate. Digital information can be encoded and stored as different resistance states of the Aloe vera film. Experimental results reveal that bipolar resistive switching behavior of the Aloe vera film is due to electrochemical growth and dissolution of metallic filaments connecting the top and bottom electrodes. The resistive switching behavior …

How Religion Influences Coping With Stress And Challenges In Families, Michael A. Goodman, Antonious Skipper, David C. Dollahite, Loren D. Marks, Emily Layton

Faculty Publications

One key finding of our American Families of Faith research project is that (instead of being defeated by challenges) strong families find ways to effectively cope with and grow closer through stressful situations. Interestingly, six decades ago, Jeff Hill’s uncle, family sociologist Reuben Hill, began to conceptually and empirically examine why some families succumb to crisis as a result of a stressful situation, while other families remain resilient. While stress can lead to crisis, crisis can also lead to familial resilience and the ability of the family to better cope with future stressors. Different families obviously have different strengths and …

Performing Out Of Limbo: Reflections On Doing Anthropology Through Music With Oromo Refugees In Indonesia, Dave Lumenta, Rhino Ariefiansyah, Betharia Nurhadist

Antropologi Indonesia

This article is an anthropological reflection on an on-campus collaborative music project between (Ethiopian) Oromo refugees and local Indonesian university teaching staff, students and professional musicians. It follows the way the project evolved from what was initially seen as a simple academic research opportunity and technical assistance for refugees to record their songs into a mutually transformative experience for those involved. It reflects on the process and the way art—as a collaborative practice and non-programmatic form of human engagement—provided new possibilities for the refugees living in transit in Indonesia to explore their talents and possible career opportunities for the future. …

Aerodynamic Design Of A Rectangular Wing In Subsonic Inviscid Flow By Surrogate-Based Optimization, Xiaosong Du, Anand Amrit, Andrew Thelen, Leifur Leifsson, Yu Zhang, Zhong Hua Han, Slawomir Koziel

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The paper presents results of aerodynamic design of a rectangular wing in subsonic inviscid flow using surrogate-based local and global search algorithms. The aerodynamic design problem is formulated in Benchmark Cases 3 and 6 developed by the AIAA Applied Aerodynamics Discussion Group. Both involve lift-constrained drag minimization at a Mach number of 0.5 with relatively low lift coefficients (0.2625 and 0.375) with several nonlinear constraints and a small number design variables (up to 15). In this work, the local search is performed using variable-fidelity modelling and output space mapping, whereas the global search is performed using approximation-based surrogates. The paper …

Aerodynamic Design Of The Rae 2822 In Transonic Viscous Flow: Single- And Multi-Objective Optimization Studies, Anand Amrit, Xiaosong Du, Andrew Thelen, Leifur Leifsson, Slawomir Koziel

Mechanical and Aerospace Engineering Faculty Research & Creative Works

This paper addresses a benchmark aerodynamic design problem proposed by the AIAA Aerodynamic Design Optimization Discussion Group: Drag minimization of the RAE 2822 in transonic viscous flow at a fixed lift coefficient with constraints on the pitching moment coefficient and the cross-sectional area. The single-objective optimization (SOO) problem is solved using surrogate-based optimization (SBO) with the surrogates constructed through output space mapping and variable-resolution Reynolds-Averaged Navier-Stokes computational fluid dynamics models. Improving the implementation of our search algorithms enabled us to obtain the SOO optimal design four times faster than in our prior work in terms of CPU time. To explore …

Airfoil Design Under Uncertainty Using Non-Intrusive Polynomial Chaos Theory And Utility Functions, Xiaosong Du, Leifur Leifsson, Slawomir Koziel, Adrian Bekasiewicz

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Fast and accurate airfoil design under uncertainty using non-intrusive polynomial chaos (NIPC) expansions and utility functions is proposed. The NIPC expansions provide a means to efficiently and accurately compute statistical information for a given set of input variables with associated probability distribution. Utility functions provide a way to rigorously formulate the design problem. In this work, these two methods are integrated for the design of airfoil shapes under uncertainty. The proposed approach is illustrated on a numerical example of lift-constrained airfoil drag minimization in transonic viscous flow using the Mach number as an uncertain variable. The results show that compared …

Pareto Ranking Bisection Algorithm For Em-Driven Multi-Objective Design Of Antennas In Highly-Dimensional Parameter Spaces, Adrian Bekasiewicz, Slawomir Koziel, Leifur Leifsson, Xiaosong Du

Mechanical and Aerospace Engineering Faculty Research & Creative Works

A deterministic technique for fast surrogate-assisted multi-objective design optimization of antennas in highly-dimensional parameters spaces has been discussed. In this two-stage approach, the initial approximation of the Pareto set representing the best compromise between conflicting objectives is obtained using a bisection algorithm which finds new Pareto-optimal designs by dividing the line segments interconnecting previously found optimal points, and executing poll-type search that involves Pareto ranking. The initial Pareto front is generated at the level of the coarsely-discretized EM model of the antenna. In the second stage of the algorithm, the high-fidelity Pareto designs are obtained through optimization of corrected local-approximation …

Expedite Design Of Variable-Topology Broadband Hybrid Couplers For Size Reduction Using Surrogate-Based Optimization And Co-Simulation Coarse Models, Piotr Kurgan, Slawomir Koziel, Leifur Leifsson, Xiaosong Du

Mechanical and Aerospace Engineering Faculty Research & Creative Works

In this paper, we discuss a computationally efficient approach to expedite design optimization of broadband hybrid couplers occupying a minimized substrate area. Structure size reduction is achieved here by decomposing an original coupler circuit into low- and high-impedance components and replacing them with electrically equivalent slow-wave lines with reduced physical dimensions. The main challenge is reliable design of computationally demanding low-impedance slow-wave structures that feature a quasi-periodic circuit topology for wideband operation. Our goal is to determine an adequate number of recurrent unit elements as well as to adjust their designable parameters so that the coupler footprint area is minimal. …

Molecular Simulation Of Steady-State Evaporation And Condensation: Validity Of The Schrage Relationships, Zhi Liang, Thierry Biben, Pawel Keblinski

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The Accuracy, or Even the Validity, of the Schrage Relationships Expressing the Rate of Evaporation and Condensation in Terms of Local Interfacial Thermodynamics Properties and the Mass Accommodation Coefficient is a Subject of Significant Discussion. in This Work, We Carry Out Molecular Dynamics (MD) Simulations of Evaporation and Condensation of Fluid Ar in a Nanochannel. by Adjusting the Temperature Difference, ΔT, between the Evaporating and Condensing Surfaces, We Control the Steady-State Evaporation and Condensation Fluxes (JMD). We Find that Across a Wide ΔT Range Studied, JMD is Always in Excellent Agreement with the Prediction from the Exact Schrage Relationships. Furthermore, …

Local Health Departments In Iowa: Are They Keeping Up With The Shift From Communicable To Chronic Disease?, Jeremy M. Whitaker

Dissertations and Theses @ UNI

The leading causes of death in the United States are heart disease, cancer, and lower respiratory diseases; chronic disease that account for over half of all deaths. Local health departments (LHDs) are not required by statute to prevent these diseases. This study examines three questions: (1) Are local health departments engaging in primary chronic disease prevention, (2) Are there differences between urban and rural health departments in preventing chronic disease, and (3) What the barriers preventing them from preventing chronic disease.

LHDs are primarily funded by a combination of state and local funding, with much of the state funding coming …

Improving Learning Center Usage Verification Processes Using Six Sigma, Latricia C. Hylton

Dissertations and Theses @ UNI

The Academic Learning Center at the University of Northern Iowa provides tutoring and advising services to enrolled students at the university. As Iowa legislatures consider performance based funding, having accurate and timely student usage data is imperative for the Academic Learning Center as the data is used in making funding decisions. The purpose of this research is to improve the student usage verification process and increase the accuracy of data collected by a math and science tutoring center located in the Academic Learning Center. An Access database was designed to record and track the math and science tutoring services provided …

Graduate Recital In Saxophone, Cehuai Zhang

Dissertations and Theses @ UNI

Cehuai Zhang performed his graduate recital on Thursday, March 2, 2017 at 8:00 p.m. in Davis Hall at the Gallagher-Bluedorn Performing Arts Center on the campus of the University of Northern Iowa. This recital was given in partial fulfillment of the requirement for his Master of Music degree, with an emphasis in saxophone performance. The recital program consisted of Concertino da Camera for alto saxophone and eleven instruments (transcribed for piano) by Jacques Ibert, Mai for alto saxophone solo by Ryo Noda, Fantaisie Sur un Theme Original for alto saxophone and piano by Jules Demersseman, and Buku for saxophone solo …

Protests, Pageants, And Publications: Narratives Of Labor Agitators, 1913-1914, Jayme Edmund

Dissertations and Theses @ UNI

In the vast historiography on the American labor movement workers have been treated as noble artisans, brave unionists, martyrs to the cause of unionization, and losers in the triumph of the “free market”. They have not been treated as historians producing their own stories. In crafting their own narratives labor activists acted as historians, reaching beyond recent events to contextualize their struggles and create a narrative that would mobilize both labor and non-labor audiences behind their goals. They offered a vision of the past as leading to present or recent problems and framed unions or labor solidarity as the solution …

Seth Nordin In Recital, Matthew Seth Nordin

Dissertations and Theses @ UNI

This recital was prepared in collaboration with Dr. Polina Khatsko, Brent Mead, Nathaniel Welshons, and Tom Rauch. It was presented in partial fulfillment of the requirements for the University of Northern Iowa's Master of Music degree. The works presented were carefully chosen to showcase the performer's instrumental proficiency and understanding of a variety of solo tenor and alto trombone literature and chamber music. They are, in order, Concerto for Alto Trombone and Piano by Georg Christoph Wagenseil, selections from Dichterliebe by Robert Schumann, Improvisation No. 1 by Enrique Crespo, Fantasy for Trombone by Sigismond Stojowski, Concerto for Trombone and Orchestra …

A Graduate Recital In Piano, Jennifer Regina Legarde

Dissertations and Theses @ UNI

This recital abstract examines the program that was performed by Jennifer R. LeGarde on Friday, February 24, 2017 at eight o’clock in the evening, in the Gallagher-Bluedorn Performing Arts Center’s Davis Hall. This recital was performed in partial fulfillment of the degree of Master of Music in Piano Performance and Pedagogy. The pieces that were performed on this program were selected by Ms. LeGarde because of their representation of four general stylistic periods of music. The program was presented in two parts and in chronological order. While each piece showcases stylistic features unique to each time period, they also are …

The Civic And Political Engagement Of Latinos In Omaha, Nebraska, Christian Israel Espinosa Torres

Dissertations and Theses @ UNI

Prior to 2006, Latinos in this country were virtually disregarded as an active political group. However, on May 1, 2006, thousands of immigrants and advocates across the United States marched in major cities to protest proposed immigration laws. In Omaha, Nebraska, alone, it was estimated that community groups energized 15,000 people to march in protest that day. Since the marches, both the number of Latinos and public participation of that group has grown dramatically. But, that growth has not been without its setbacks. While that first display of unity was striking in 2006, many factors have combined to prove that …

Zoning And The Complicated Reliance On Restrictive Covenants, Dennis A. Kerbel

FIU Law Review

No abstract provided.