Digital Commons Network^™

A Mathematical Model For The Energy Stored In Green Roofs, Maria Aguareles, Marc Calvo-Schwarzwalder, Francesc Font, Timothy G. Myers

All Works

A simple mathematical model to estimate the energy stored in a green roof is developed. Analytical solutions are derived corresponding to extensive (shallow) and intensive (deep) substrates. Results are presented for the surface temperature and energy stored in both green roofs and concrete during a typical day. Within the restrictions of the model assumptions the analytical solution demonstrates that both energy and surface temperature vary linearly with fractional leaf coverage, albedo and irradiance, while the effect of evaporation rate and convective heat transfer is non-linear. It is shown that a typical green roof is significantly cooler and stores less energy …

Guidelines For Fabricating Highly Efficient Perovskite Solar Cells With Cu2o As The Hole Transport Material, Sajid Sajid, Salem Alzahmi, Imen Ben Salem, Ihab M. Obaidat

All Works

Organic hole transport materials (HTMs) have been frequently used to achieve high power conversion efficiencies (PCEs) in regular perovskite solar cells (PSCs). However, organic HTMs or their ingredients are costly and time-consuming to manufacture. Therefore, one of the hottest research topics in this area has been the quest for an efficient and economical inorganic HTM in PSCs. To promote efficient charge extraction and, hence, improve overall efficiency, it is crucial to look into the desirable properties of inorganic HTMs. In this context, a simulation investigation using a solar cell capacitance simulator (SCAPS) was carried out on the performance of regular …

Perovskite-Surface-Confined Grain Growth For High-Performance Perovskite Solar Cells, Sajid Sajid, Salem Alzahmi, Imen Ben Salem, Ihab M. Obaidat

All Works

The conventional post-annealing (CPA) process is frequently employed and regarded a crucial step for high-quality perovskite thin-films. However, most researchers end up with unwanted characteristics because controlling the evaporation rate of perovskite precursor solvents during heat treatment is difficult. Most perovskite thin-films result in rough surfaces with pinholes and small grains with multiple boundaries, if the evaporation of precursor solvents is not controlled in a timely manner, which negatively affects the performance of perovskite solar cells (PSCs). Here, we present a surface-confined post-annealing (SCPA) approach for controlling the evaporation of perovskite precursor solvents and promoting crystallinity, homogeneity, and surface morphology …

Predicting The Level Of Respiratory Support In Covid-19 Patients Using Machine Learning, Hisham Abdeltawab, Fahmi Khalifa, Yaser Elnakieb, Ahmed Elnakib, Fatma Taher, Norah Saleh Alghamdi, Harpal Singh Sandhu, Ayman El-Baz

All Works

In this paper, a machine learning-based system for the prediction of the required level of respiratory support in COVID-19 patients is proposed. The level of respiratory support is divided into three classes: class 0 which refers to minimal support, class 1 which refers to non-invasive support, and class 2 which refers to invasive support. A two-stage classification system is built. First, the classification between class 0 and others is performed. Then, the classification between class 1 and class 2 is performed. The system is built using a dataset collected retrospectively from 3491 patients admitted to tertiary care hospitals at the …

Adherence To Mediterranean Diet And Nutritional Status In Women With Breast Cancer: What Is Their Impact On Disease Progression And Recurrence-Free Patients’ Survival?, Maria Mantzorou, Maria Tolia, Antigoni Poultsidi, Georgios K. Vasios, Dimitrios Papandreou, Stamatios Theocharis, Nikolaos Kavantzas, Andreas Y. Troumbis, Constantinos Giaginis

All Works

Introduction: Nutritional status impacts the survival of patients with cancer. There are few studies that investigate the role of nutritional status on breast cancer survival in women with breast cancer, and even fewer regarding the impact of adhering to the Mediterranean diet (MD). The present study aims to assess the nutritional status, MD adherence, physical activity levels and health-related quality of life (HRQOL) in women diagnosed with breast cancer and evaluate these parameters regarding recurrence-free survival. Methods: A total of 114 women, aged 35–87 years old, diagnosed with breast cancer in Larissa, Greece, participated in the study. Tumor histopathology was …

Front Matter, Volume 48, Number 1, University Of Dayton

University of Dayton Law Review

Front matter, Volume 48, Number 1

Privacy In The Panopticon: The Fourth Amendment Case Against Perpetual Surveillance, John P. Jarecki

University of Dayton Law Review

No abstract provided.

Association Between Fetal Abdominal Growth Trajectories, Maternal Metabolite Signatures Early In Pregnancy, And Childhood Growth And Adiposity: Prospective Observational Multinational Interbio-21st Fetal Study, Jose Villar, Roseline Ochieng, Robert B. Gunier, Aris T. Papageorghiou, Stephen Rauch, Rose Mcgready, Julia M. Gauglitz, Fernando C. Barros, Manu Vatish, Shama Munim

Department of Obstetrics & Gynaecology

Background: Obesity predominantly affects populations in high-income countries and those countries facing epidemiological transition. The risk of childhood obesity is increased among infants who had overweight or obesity at birth, but in low-resource settings one in five infants are born small for gestational age. We aimed to study the relationships between: (1) maternal metabolite signatures; (2) fetal abdominal growth; and (3) postnatal growth, adiposity, and neurodevelopment.
Methods: In the prospective, multinational, observational INTERBIO-21st fetal study, conducted in maternity units in Pelotas (Brazil), Nairobi (Kenya), Karachi (Pakistan), Soweto (South Africa), Mae Sot (Thailand), and Oxford (UK), we enrolled women (≥18 years, …

An Est Approach To Entrepreneurial Exit In Chinese Family Business: A Case Study Of H Company, Lidian Zhang

Dissertations and Theses Collection (Open Access)

Previous entrepreneurial exit literature has mostly followed a feature-oriented logic by summarizing the impact of industry and company characteristics and entrepreneurs’ personal traits on entrepreneurial exit decisions, disregarding the decision-making process of entrepreneurial exit and the role of key events in advancing the process. This thesis endeavors to explore the determining factors behind entrepreneurial exit decisions of family businesses and the dynamic decision-making process based on Event System Theory (EST) with a single-case study method and a feature-oriented and process-oriented approach.

This study has conducted an in-depth investigation into Company H, which possesses typical features of Chinese private family businesses. …

Exploring A Suitable Youth Football Training Model For China: From The Perspective Of Customer Engagement, Nanyan Zheng

Dissertations and Theses Collection (Open Access)

As a major sport country, China’s football is facing tricky problems of insufficient reserve players and football culture alienation. Improving the quality of youth football training not only can supplement a large number of reserve players, but also shape a sound football culture, which is a good approach to the current problems of China’s football. Based on the theory of customer engagement, this dissertation starts from the reality of Chinese youth football training, analyzes the problems existing in current youth football training in depth, and proposes that convenience, interest and empathy can improve the customer engagement of youth trainees. Outland …

Hanford Low-Activity Waste Glass Composition-Temperature-Melt Viscosity Relationships, Alejandro Heredia-Langner, Vivianaluxa Gervasio, Scott K. Cooley, Charmayne E. Lonergan, Dong Sang Kim, Albert A. Kruger, John D. Vienna

Materials Science and Engineering Faculty Research & Creative Works

This study developed a model for predicting viscosity of alkali-alumino-borosilicate glass melts as functions of composition and temperature. The model is based on a total of 3935 viscosity-temperature data from 574 glasses with viscosity values ranging from 2.53 to 7260 Poise (P) in the temperature range of 900–1260°C. Several different model forms were surveyed, including those based on Arrhenius, Vogel-Fulcher-Tammann, Avramov-Milchev, and Mauro-Yue-Ellison-Gupta-Allen. For each of these models, combinations of the temperature-independent parameters were fitted to composition. It was found that generally fitting more than one temperature-independent parameter as functions of composition resulted in overfitting. The Avramov-Milchev-based model was found …

Effect Of Cu Additions On Scale Structure And Descaling Efficiency Of Low C Steel Reheated In A Combustion Gas Atmosphere, Richard Osei, Simon Lekakh, Ronald J. O'Malley

Materials Science and Engineering Faculty Research & Creative Works

Modern EAF steelmaking employs scrap as its primary source of raw material. Different sources of scrap have varying levels of residuals, which can negatively influence product properties, performance, and surface quality. The presence of some residuals, such as Cu and Ni in controlled quantities, can also positively impact steel performance for some applications. It is also well known that interactions between residuals and alloying elements in steel can modify the structure of scale formed during slab reheating prior to hot rolling. These changes in the scale structure can influence scale removability. In this study, the effect of varying Cu concentrations …

Fusion Welding Of Refractory Metals And Zrb2-Sic-Zrc Ceramics, Jecee D. Jarman, William Fahrenholtz, Greg Hilmas, Jeremy Lee Watts, Tieshu Huang

Materials Science and Engineering Faculty Research & Creative Works

Molybdenum and a molybdenum alloy were fusion welded to ZrB2-based ceramics to determine if the electrical and thermal properties of the metals and ceramics affected their weldability. Commercial ceramic powders were hot pressed, machined into coupons, and preheated to 1600 °C before joining the ceramics to commercial metals using plasma arc welding. Weldability varied as indicated by the range of porosity observed within the fusion zones. Measured thermal and electrical properties appeared to have little to no effect on the weldability of metal-ceramic welds despite the large range of values measured across each property. Differences in melting temperatures between metal …

Stochastic Model For High Temperature Oxidation Of Cr–Ni Austenitic Steels Assisted By Spallation, Simon N. Lekakh, Oleg Neroslavsky, Mei Li, Larry Godlevski

Materials Science and Engineering Faculty Research & Creative Works

Cr–Ni austenitic steels offer significant high temperature corrosion protection by forming a surface oxide layer. However, above critical service conditions (temperature, atmosphere, thermal cycling), oxidized surface can experience intensive degradation because of scale spallation, which could be detrimental to the in-service life. To predict the effect of scale spallation on oxidation kinetics, a simulation was implemented using a stochastic model. The model considers topological parameters and intensity of spallation which can occur, while delivering a true oxidation constant. The experimental procedure identified the amount of formed spalled scale and topology of spallation based on the use of element mapping of …

Dynamical Excitation Processes And Correlations Of Three-Body Two-Dimensional Mixtures, G. Bougas, Simeon I. Mistakidis, P. Giannakeas, P. Schmelcher

Physics Faculty Research & Creative Works

A Scheme Is Proposed To Dynamically Excite Distinct Eigenstate Superpositions In Three-Body Bose-Fermi Mixtures Confined In A Two-Dimensional Harmonic Trap. The System Is Initialized In A Noninteracting State With A Variable Spatial Extent, And The Scattering Lengths Are Subsequently Quenched Spanning The Regime From Weak To Strong Interactions. For Spatial Widths Smaller Than The Three-Body Harmonic Oscillator Length, A Superposition Of Trimers And Atom-Dimers Is Dynamically Attained, Otherwise Trap States Are Predominantly Populated, As Inferred From The Frequency Spectrum Of The Fidelity. Accordingly, The Tan Contacts Evince The Buildup Of Short-Range Two- And Three-Body Correlations In The Course Of The …

Contact Process With Simultaneous Spatial And Temporal Disorder, Xuecheng Ye, Thomas Vojta

Physics Faculty Research & Creative Works

We study the absorbing-state phase transition in the one-dimensional contact process under the combined influence of spatial and temporal random disorders. We focus on situations in which the spatial and temporal disorders decouple. Couched in the language of epidemic spreading, this means that some spatial regions are, at all times, more favorable than others for infections, and some time periods are more favorable than others independent of spatial location. We employ a generalized Harris criterion to discuss the stability of the directed percolation universality class against such disorder. We then perform large-scale Monte Carlo simulations to analyze the critical behavior …

Triple-Differential Cross Sections In Three-Dimensional Kinematics For Electron-Impact-Ionization Dynamics Of Tetrahydrofuran At 250-Ev Projectile Energy, Xiaorui Xue, Deepthy Maria Mootheril, Esam Ali, Maomao Gong, Shaokui Jia, Jiaqi Zhou, Enliang Wang, Jian Xing Li, Xiangjun Chen, Don H. Madison, Alexander Dorn, Xueguang Ren

Physics Faculty Research & Creative Works

We report a combined experimental and theoretical study of the ionization dynamics of tetrahydrofuran induced by 250 eV electron impact in which the highest occupied molecular orbital is ionized leading to the stable parent ion. Experimentally a reaction microscope was used, covering nearly the entire 4π solid angle for the ejected slow electron. We present the triple-differential cross sections for the projectile scattering angles of θ1 = -10∘ as a function of the emission angle of the ejected electrons with energies of E2=10, 15, and 20 eV, i.e., for asymmetric energy sharing between the scattered and ejected electrons. The measured …

Sum Rules For Energy Deposition Eigenchannels In Scattering Systems, Alexey Yamilov, Nicholas Bender, Hui Cao

Physics Faculty Research & Creative Works

In a random-scattering system, the deposition matrix maps the incident wavefront onto the internal field distribution across a target volume. The corresponding eigenchannels have been used to enhance the wave energy delivered to the target. Here, we find the sum rules for the eigenvalues and eigenchannels of the deposition matrix in any system geometry: including two- and three-dimensional scattering systems, as well as narrow waveguides and wide slabs. We derive a number of constraints on the eigenchannel intensity distributions inside the system as well as the corresponding eigenvalues. Our results are general and applicable to random systems of arbitrary scattering …

Student Wellness During Curriculum Implementation Of A Lifestyle Medicine Approach Within The Social-Ecological Model: A Longitudinal Study, Betsy J. Becker, Anne Skinner, Tessa Wells, Kathleen G. Volkman, Nicole M. Sleddens, Teresa Cochran

Posters and Presentations: Physical Therapy

Purpose

The student-life experience is an ideal time to implement lifelong wellness behaviors needed for the professional role. The ongoing effects of the COVID pandemic have amplified the need for Doctor of Physical Therapy (DPT) educational programs to train an emerging workforce that can, through personal wellness, withstand the stressors of personal and professional lives. The study purpose is to: a) evaluate the change in student wellness from matriculation to mid-program to completion after implementation of a curriculum based on a lifestyle medicine approach within the Social-Ecological Model, and b) compare student wellness between cohorts that matriculated before and during …

Using Satellite Images Datasets For Road Intersection Detection In Route Planning, Fatmaelzahraa Eltaher Ph.D, Ayman Taha, Jane Courtney, Susan Mckeever

Articles

Understanding road networks plays an important role in navigation applications such as self-driving vehicles and route planning for individual journeys. Intersections of roads are essential components of road networks. Understanding the features of an intersection, from a simple T-junction to larger multi-road junctions is critical to decisions such as crossing roads or selecting safest routes. The identification and profiling of intersections from satellite images is a challenging task. While deep learning approaches offer state-of-the-art in image classification and detection, the availability of training datasets is a bottleneck in this approach. In this paper, a labelled satellite image dataset for the …

Made In Singapore, Pao-Li Chang, Tran Bao Phuong Nguyen

Research Collection School Of Economics

In this paper, we characterize the position of Singapore in global value chains and identify Singapore’s key upstream and downstream trade partners. We trace how the position of Singapore in global value chains has changed in the past two decades: whether it has moved upstream or downstream, how involved it is in global value chains, how its trend compares with the other major Asian exporters (China, Japan, Korea, Taiwan and Hong Kong), and which key sectors of Singapore play a major role in these global trade networks.

Good Names Beget Favors: The Impact Of Country Image On Trade Flows And Welfare, Pao-Li Chang, Tomoki Fujii, Wei Jin

Research Collection School Of Economics

This paper estimates the effects of time-varying consumer preference bias on trade flows and welfare. We use a unique data set from the BBC World Service Poll, which surveys (annually during 2005–2017 with some gaps) the populations of a wide array of countries on their views of whether an evaluated country is having a mainly positive or negative influence in the world. We identify the effects on consumer preference parameters due to shifts in these country image perceptions and quantify their general equilibrium effects on bilateral exports and welfare (each time for an evaluated exporting country, holding the exporting country’s …

Price Dynamics Of Swedish Pharmaceuticals, Aljoscha Janssen

Research Collection School Of Economics

This paper investigates price patterns of off-patent pharmaceuticals in Sweden. I show that price dynamics are dependent on the number of competitors in the market. The price patterns follow predictions from a model of dynamic price competition in which the demand for pharmaceuticals incorporates the known biases of consumers: habit persistence and brand preferences. Using the regulated market of Swedish pharmaceuticals, I show that price dynamics may help in identifying possible tacit collusion by manufacturers in markets where consumers experience behavioral frictions.

Morphometric Measurements Of Posterior Cranial Fossa And Craniovertebral Junction In Chiari I Malformation With And Without Syringohydromyelia, Pawitra Imemkamon, Supada Prakkamakul, Ketsuda Jakchairoongruang

Chulalongkorn Medical Journal

Background: Syringohydromyelia occurs about 30.0 - 85.0% in patients with Chiari I malformation (CMI). The syrinx formation is supposed to be a result of disturbed cerebrospinal fluid flow dynamics, which is associated with the degree of mechanical blockage that may be related to posterior cranial fossa (PCF) and craniovertebral junction anatomy. Objective: Our study aimed to determine the morphometric difference in PCF and craniocervical junction between the CMI patients with and without syringohydromyelia. Methods: Thirty CMI patients (16 with syringohydromyelia; 14 without syringohydromyelia) and 16 healthy subjects were also recruited. PCF and craniocervical junction measurements of 5 distances and 5 …

Reliability Of The Thai Version Of The Modified Start Back Screening Tool In Individuals With Neck Pain, Nattawan Phungwattanakul, Uchukarn Boonyapo, Taweewat Wiangkham

Chulalongkorn Medical Journal

Backgrounds: The modified STarT Back Screening Tool in Thai version (mSBST-TH) for individuals with neck pain (NP) was adapted from the STarT Back Screening Tool in Thai version (SBST-TH) for individuals with low back pain (LBP) to classify individuals with NP into low, medium, and high risk for chronicity. Owing to a lot of individuals with NP in Thailand. It would be beneficial if the mSBST-TH was available to help primary care management in Thai individuals with NP. However, the reliability of this tool has not been investigated. Objective: The aim of this cross-sectional study was to investigate the reliability …

Intra-Rater And Inter-Rater Reliability And Minimum Detectable Change Of Visual Analog Scale And Digital Goniometer In Patients With Subacute Unilateral Lateral Ankle Sprain, Thongchai Suksri, Chitanongk Gaogasigam, Sujitra Boonyong

Chulalongkorn Medical Journal

Background: Patients with subacute unilateral lateral ankle sprain commonly experience pain and limited range of motion (ROM). Measurement reliability should be investigated before assessing treatment effectiveness. Objective: To determine both intra-rater and inter-rater reliability and minimal detectable change (MDC) of visual analog scale (VAS) and digital goniometer in patients with subacute unilateral lateral ankle sprain. Methods: Ten subjects (7 men, 3 women; aged 29.90  12.81 years) with subacute unilateral lateral ankle sprain were recruited. Two investigators measured pain intensity and ROM using VAS and a digital goniometer, respectively, with a 30-minute break between measurements. The same protocol was repeated …

Mental Health, Social Skills, And Associated Factors Of Flight Attendants In A Commercial Airline In Thailand, Thanradee Kongmanee, Peeraphon Lueboonthavatchai

Chulalongkorn Medical Journal

Background: Mounting evidence has shown that most flight attendants have an average mental health and mental health problems such as stress, fatigue, and sleep problems. However, there were limited studies concerning their social skills and associated factors. This study identified the flight attendants’ mental health, associated factors with the mental health of flight attendants in Thai Airways International Public Company Limited. Objective: To explore the mental health, social skills, and associated factors of flight attendants in Thai Airways International Public Company Limited. Methods: A cross-sectional descriptive study was performed with the participation of 408 flight attendants of Thai Airways International …

Efficacy Of Digitalized Comprehensive Educational Program For Patients With Allergic Contact Dermatitis: A Randomized Controlled Trial, Wongsiya Viarasilpa, Prattana Sittiwattanawong

Chulalongkorn Medical Journal

Background: Allergic contact dermatitis (ACD) is an inflammatory skin disease resulting from exposure to allergen. The patient education is crucial to successful treatment and management of ACD. However, this process can be time consuming, requiring trained healthcare personnel resulting in increased workload and may be difficult in the setting of limited workforce or resource. Objective: To assess the effect of informative digitalized video-based educational program (iDVE) on patients’ quality of life, disease severity and knowledge of ACD compared to standard counselling (control). Methods: Patients with ACD were randomized to participate in iDVE or control group. The primary outcome was the …

Development Of A Questionnaire To Evaluate The Attitudes Towards Home Health Visits In Applied Thai Traditional Medical Students: A Pilot Study, Sarunthorn Puttipaibool, Athippat Tantiwongsekunakorn, Kaittiyos Kuldejchaichan, Sukree Kade, Sirikan Poopong, Photnicha Jaturapat, Sasima Tongsai, Suprapath Sonjaipanich, Pravit Akarasereenont

Chulalongkorn Medical Journal

Background: Home health visits (HHV) are the new duty and development of students of applied Thai traditional medicine (ATM). We performed to develop a measuring instrument to ensure that students have positive attitudes to HHV. Objective: To develop a reliable and valid questionnaire for evaluating attitudes regarding home health visits among ATM students. Methods: There are 28 items in creating the questionnaire which is supposed to be used to assess attitudes toward HHV in four areas, including those related to the practice in HHV, the role of ATM practitioners, relationship with patients and patient’s relatives, and collaboration with the multidisciplinary …

Factors Influencing Decision Making To Use Large Private Hospitals Of Thai Patients In Bangkok After Covid-19 Outbreak, Decha Lalitanantpong, Kingporn Thongbai, Anothai Ngamvichaikit

Chulalongkorn Medical Journal

Background: The worldwide pandemic of coronavirus infections disease 2019 (COVID-19 impacts the Thai medical’s hub tourism industry. The private hospital sector needs to provide appropriate services for Thai consumers. Objectives: The objectives of this research were to study: 1) The level of decision making of use large private hospitals of Thai patients living in Bangkok after COVID-19 outbreak; 2) The marketing mix related to the level of decision making to use large private hospitals; 3) The marketing mix that influences decision making to use large private hospitals. Methods: This study was a survey research. The population was 8,757,843 Thai patients …