Digital Commons Network^™

Thermodynamic Analysis For The Selection Of Low Gwp Refrigerants In Ground Source Heat Pumps, Davide Menegazzo, Sergio Bobbo, Laura Fedele, Michele De Carli, Laura Carnieletto, Giuseppe Emmi, Fabio Poletto, Andrea Tarabotti, Dimitris Mendrinos, Giulia Mezzasalma, Adriana Bernardi

International Refrigeration and Air Conditioning Conference

One of the main objectives of the European Commission in the buildings sector, responsible for approximately 40% of total energy consumption and 36% of greenhouse gas emissions, is to identify technological solutions capable of reducing energy consumption and at the same time greenhouse gas emissions. For this purpose, ground source heat pump system (GSHPs) is a technology of particular interest that promises to considerably reduce greenhouse gas emissions of HVAC systems (up to 44% compared to air source heat pumps). In order to develop and test innovative GSHPs to be used for heating and cooling in the various European climatic …

Refrigerant Concentration Mapping Using Real-Time Gas Monitoring; Phase I- Data Collection System Verification, Jethro Medina, Mary Koban

International Refrigeration and Air Conditioning Conference

Environmental regulations are increasingly restricting the use of traditional high global warming potential (GWP) fluorinated refrigerants (1). Hydrofluorocarbons or HFCs are fluorinated refrigerants with zero ozone depletion potential (ODP). They are typified by having good shelf and use stability, material compatibility, adequate capacity and generally good performance across a range of operating conditions all while being non-flammable. However, due to the high GWP (>1000-5000), they are losing favor in the marketplace. Many international equipment standards (IEC 60335-2-24, IEC 60335-2-40, IEC 60335-2-89, etc.) and installation standards (ISO 5149) are being revised to further enable use of lower GWP, 0 ODP …

Experimental Comparison Of Hcfo And Hfo R1224yd(Z), R1233zd(E), R1336mzz(Z), And Hfc R245fa In A High Temperature Heat Pump Up To 150 °C Supply Temperature, Cordin Arpagaus, Stefan Bertsch

International Refrigeration and Air Conditioning Conference

The use of industrial high-temperature heat pumps (HTHP) is particularly interesting for heat recovery applications and various industrial processes such as steam generation, drying, sterilization, paper production, or food preparation. The application of new synthetic hydrofluoroolefin (HFO) and hydrochlorofluoroolefin (HCFO) refrigerants with low environmental impact is becoming increasingly important in future HTHP. At our university in Switzerland, a laboratory-scale HTHP has been developed as part of the SCCER-EIP project (Swiss Competence Center for Energy Research – Efficiency of Industrial Processes). The developed heat pump is single-stage, operates with a variable speed piston compressor, and contains a continuously adjustable internal heat …

Service Quality And Passenger Satisfaction In Air Transportation In A Developing Economy: Evidence From Nigeria, Obioma R. Nwaogbe, Innocent C. Ogwude, Ejem E. A, A Pius

Journal of Aviation Technology and Engineering

This study investigates the quality of service provided for air travel in Nigeria and the level of satisfaction of passengers with the service encountered. It does so by focusing on both the airports and the airlines as service providers. In that way, the study captures much of the effects of the organizational culture, employee behavior, and general norms which influence passenger attitudes. The SERVQUAL model was used in measuring the five dimensions of service. Domestic travel only was studied, with data obtained from well-structured questionnaires to evaluate perception–expectation gaps in airports as well as in airlines. The overall gap score …

In Vivo Tissue-Specific Chromatin Profiling In Drosophila Melanogaster Using Gfp-Tagged Nuclei, Juan Jauregui-Lozano, Kimaya Bakhle, Vikki M. Weake

Department of Biochemistry Faculty Publications

The chromatin landscape defines cellular identity in multicellular organisms with unique patterns of DNA accessibility and histone marks decorating the genome of each cell type. Thus, profiling the chromatin state of different cell types in an intact organism under disease or physiological conditions can provide insight into how chromatin regulates cell homeostasis in vivo. To overcome the many challenges associated with characterizing chromatin state in specific cell types, we developed an improved approach to isolate Drosophila melanogaster nuclei tagged with a GFPKASH protein. The perinuclear space-localized KASH domain anchors GFP to the outer nuclear membrane, and expression of UAS-GFPKASH can …

After A Wildfire: Water Safety Considerations For Private Wells, Andrew J. Whelton, C. Jankowski, K. Isaacsson

Resilience to Emergencies and Disasters

No abstract provided.

Refuge Must Be Given: Eleanor Roosevelt, The Jewish Plight, And The Founding Of Israel, John F. Sears

Purdue University Press Books

Refuge Must Be Given details the evolution of Eleanor Roosevelt from someone who harbored negative impressions of Jews to become a leading Gentile champion of Israel in the United States. The book explores, for the first time, Roosevelt’s partnership with the Quaker leader Clarence Pickett in seeking to admit more refugees into the United States, and her relationship with Undersecretary of State Sumner Welles, who was sympathetic to the victims of Nazi persecution yet defended a visa process that failed both Jewish and non-Jewish refugees.

After the war, as a member of the American delegation to the United Nations, Eleanor …

The Canine-Campus Connection, Mary Renck Jalongo

New Directions in the Human-Animal Bond

A primary mission of universities is promoting student success and well-being. Many college and university personnel have implemented initiatives that offer students the documented benefits of positive human-animal interaction (HAI). Accumulating evidence suggests that assistance dogs, therapy dogs, and shelter dogs can support student wellness and learning. The best programs balance the welfare of humans and canines while assessing students’ needs and complying with all laws and regulations. Contributors to this edited volume have drawn upon research across many disciplines as well as their extensive practical experiences to produce a timely and valuable resource—for administrators and students. Whether readers are …

Time Decay: Assets, Authoritarianism, And Anxiety About The Future, Jack Davies

CLCWeb: Comparative Literature and Culture

This article identifies a basic formula in the Freudo-Marxist take on twentieth-century authoritarianism. This is the incommensurability of inherited past development with the pace and demands of industrial social life, damming up a tremendous excess that seeks reactionary outlet. Authoritarianism, here, breeds in the contradiction between the symptoms of the Oedipal drama and the commodity form. The implicit “repressive hypothesis” for sexuality and developmentalist teleology make this theorization of authoritarian formations untenable today. This article, however, identifies moments of promise in this literature, and turns to materials available to these thinkers—specifically interwar psychoanalytic theory on anxiety and economic theory on …

Defending “Western” Values: Reactionary Neoliberalism In The Americas, Gabriela Segura-Ballar

CLCWeb: Comparative Literature and Culture

Right-wing populism and authoritarianism are on the rise globally after the financial crisis of 2008. This reactionary trend has widely channeled anxieties created by neoliberal insecurities into cultural and nationalistic backlash against the ostensible enemies of “Western” values (e.g., immigrants, racial and sexual minorities, feminists, and leftists). President Jair Bolsonaro’s “Brazil above everything, God above everyone” and President Donald Trump’s “Make America Great Again” are the most conspicuous examples of the resurgence of a populist reactionary right in the Americas. This continental trend promotes ultra-nationalism and more coercive neoliberalization processes combined with a reactionary authoritarianism that celebrates essentialized “Western” values, …

Incipient Fascism: Black Radical Perspectives, Alberto Toscano

CLCWeb: Comparative Literature and Culture

The sordid twilight of the Trump presidency raised the stakes of the debate on fascism. While much of the discussion has been magnetised by the legitimacy of analogies with the 1930s, this article argues that a rich and complex tradition of Black radical critique of right-wing authoritarianism provides a vital resource for thinking through the problem of US fascism beyond analogy – beginning with the DuBoisian insight that a racial fascism forged by chattel slavery and settler-colonialism anticipated the ascendancy of European fascisms. The article homes in on Black radical theories of fascism developed in the wake of the movements …

Neo-Authoritarianism And The Contestation Of White Identification In The Us, Justin Gilmore

CLCWeb: Comparative Literature and Culture

Justin Gilmore’s article "Neo-Authoritarianism and the Contestation of White Identification in the US" examines how the political forces around Donald Trump are often interpreted as an external attack on American democracy, and how the dynamism of these attacks is thought to emanate from various sites of white chauvinism. This article argues that such an interpretation is partial. The upsurge associated with “Trumpism” represents a distinctive contestation of an alternative type of white identity, one that has been elemental for a progressive form of neoliberalism. Although the neoliberal construction of white identification is distinctive, and indeed kinder, its material basis rests …

Neo-Authoritarianism Without Authority, Massimiliano Tomba

CLCWeb: Comparative Literature and Culture

This article examines two aspects of neo-authoritarianism. The first is mainly diagnostic and concerns the nature of authoritarianism as a phenomenon of transition. The article investigates tensions and conflicts between temporalities. It pays attention to the asynchronous nature of change which, alongside the social structural level of changes, also the psycho-social level, intervene politically in different forms. There are social strata that are strangers in their own country and do not share the same present with others. For them, looking to the past is the only way to imagine a different future. If they are looking for values and authority, …

A Trumpian Mechanism, Emmett Peixoto

CLCWeb: Comparative Literature and Culture

In 2016, a liar made a hypocrite appear worse and thereby won the US presidency. How did a liar, which is traditionally deemed something worse than a hypocrite, manage to do this? This article offers an answer. It does so by uncovering a peculiar mechanism, a Trumpian mechanism, at the heart of Trump’s relations with his critics. The mechanism explains how Trump benefited from wrong-footing his critics and is thus essential for understanding Trump’s success. The article offers a few key examples of this mechanism working against Trump’s political opponents, e.g., Trump’s (first) impeachment. It then shows how the mechanism …

Authoritarianism And Ideology, Asad Haider

CLCWeb: Comparative Literature and Culture

In “Authoritarianism and Ideology,” Asad Haider approaches the problem of authoritarianism by considering the classical question of tyranny, as framed by Spinoza, and how this can be traced to the Marxist theory of ideology. A fundamental axis of the debate over ideology in twentieth century Marxism was the phenomenon of fascism, theorized in highly influential but also markedly different ways by figures like Wilhelm Reich and Theodor Adorno. A close reading of two major texts—Reich's Mass Psychology of Fascism and Adorno's contributions to The Authoritarian Personality—provides a basis for conceptually elaborating different directions that can be taken in the study …

Introduction: New Faces Of Authoritarianism, Asad Haider, Massimiliano Tomba

CLCWeb: Comparative Literature and Culture

No abstract provided.

More Than “Just” Walking: An Observational Study Of Dog-Related Physical Activities, Benedikt Hielscher, Udo Ganslosser, Ingo Froboese

People and Animals: The International Journal of Research and Practice

Dog ownership has been shown to correlate with physical activity (PA). However, knowledge about the intensities of dog-related PA (drPA) is still lacking. To investigate the duration and intensity of drPA in consideration of PA guidelines, an observational study of dog owners (DO) was conducted.

For this purpose, DO were recruited in metropolitan and nonmetropolitan regions of Cologne, Germany. A total of 44 male and female DO (18–64 years) without cardiovascular or cardiopulmonary diseases participated in the study. Validated questionnaires were used to determine the PA profile and relationship of DO to their dog. Participants reported their drPA in an …

Radiation Hardened Technologies For Microelectronics In Space, Ricardo Xie

Purdue Undergraduate Research Conference

Semiconductor devices and integrated circuits (ICs) used in spacecraft are exposed to large amounts of ionizing radiation. These environmental hazards can result in consequences for microelectronic devices ranging from temporary loss of data to permanent loss of spacecraft functionality. The purpose of this project is to study the Single Event Effects (SEE) of memories in the low-earth orbital radiation environment. SEEs are caused by a single ionizing radiation particle passing through a sensitive region of an electronic or photonic device. Prediction of SEE occurrence rate requires knowledge of both radiation environment and electronic devices. To address this problem using a …

Glycosylation Of Immune Receptors In Cancer, Ruoxuan Sun, Alyssa Min Jung Kim, Seung-Oe Lim

Purdue University Libraries Open Access Publishing Fund

Evading host immune surveillance is one of the hallmarks of cancer. Immune checkpoint therapy, which aims to eliminate cancer progression by reprogramming the antitumor immune response, currently occupies a solid position in the rapidly expanding arsenal of cancer therapy. As most immune checkpoints are membrane glycoproteins, mounting attention is drawn to asking how protein glycosylation affects immune function. The answers to this fundamental question will stimulate the rational development of future cancer diagnostics and therapeutic strategies.

Factors Influencing Student Stem Learning: Self-Efficacy And Outcome Expectancy, 21st Century Skills, And Career Awareness, Jung Han, Todd R. Kelley, J. Geoff Knowles

Technology Leadership and Innovation Faculty Publications

Social, motivational, and instructional factors impact students’ outcomes in STEM learning and their career paths. Based on prior research and expectancy-value theory, the study further explored how multiple factors affect students in the context of integrated STEM learning. High school STEM teachers participated in summer professional development and taught integrated STEM to students during the following school year, where scientific inquiry, biomimicry, 3D printing technology, and engineering design were integrated as instructional strategies. Surveys were conducted to measure teacher self-efficacy and outcome expectancy. Student STEM attitudes (self-efficacy and expectancy-value beliefs), 21st century skills, STEM career awareness, and STEM knowledge achievement …

Clima Y Café = Climate & Coffee: Adapting Together To Climate Change In Colombia (2020/2021 Engaged Activities), Jessica Eise

Brian Lamb School of Communication Working Papers

*Clima y Café* is a research-informed information and communication project to help Colombian coffee farmers adapt to climate change. It is participatory and practices tailored, collaborative activities that seek to (1) support farmers with targeted information, resources and solutions, (2) draw attention to their needs and (3) inspire and motivate change in local, regional, national and international communities. This report contains outreach activities supporting the social, engaged scholarship component of *Clima y Café *during the academic calendar year of 2020/202. Activities included podcast and radio segments, a photography exhibition, tailored WhatsApp videos, printed posters and calendars, Facebook Live meetings and …

Condensation Heat Transfer Of R410a Inside Multiport Minichannels With Different Cross-Sectional Geometry, Hoang Ngoc Hieu, Nurlaily Agustiarini, Pham Quang Vu, Jong-Taek Oh

International Refrigeration and Air Conditioning Conference

Condensation heat transfer of R410a in a multiport mini-channels tubes with different cross-sectional geometry is experimentally investigated. Three tubes with aspect ratio of 0.395, 0.385 and 0.446, and hydraulic diameters of 1.147 mm, 1.135 mm and 0.846 mm with number of channels (7, 11 and 18) are tested in this study. The experimented range of heat flux is from 3 to 15 kW/m2, mass flux from 50 to 500 kg/m2s. The data show that the heat transfer coefficient increases with heat flux, mass flux and vapor quality. A performance comparison was conducted among the 3 tested tubes and it was …

Microstructural Refinement Of Cement Paste Internally Cured By Polyacrylamide Composite Hydrogel Particles Containing Silica Fume And Nanosilica, Baishakhi Bose, Cole R. Davis, Kendra Erk

School of Materials Engineering Faculty Publications

Supplementary cementitious materials were incorporated into hydrogel-based internal curing agents to improve the hydration, microstructure, and ultimately strength of internally cured high-performance cement paste. Polyacrylamide composite hydrogel particles containing amorphous silica – either silica fume or nanosilica – and two different polymer network crosslink densities were synthesized and incorporated into cement paste. The presence of silica and low crosslink density increased the absorption capacity of the particles in pore solution. Micrographs of internally cured paste indicated a significant improvement in hydrogel-related void-filling ability and an increase in void size for low crosslink density particles containing silica. Compressive strength and electrical …

Inside An Energy-Efficient Upgrade For A Historical Army Band Hall, Ai Sexton, Ryan Edwards, Vimal Nair

International Refrigeration and Air Conditioning Conference

This paper discusses the Heating, Ventilation, and Air Conditioning (HVAC) system designed as part of amajor renovation project to the historical San Antonio building that serves as home to the U.S. Army Band known as “Fort Sam Houston’s Own.” The HVAC system design provides an innovative new heating and cooling system intendedtosaveenergyandgivethefacilityamoresustainablelong-termlife.ThefacilityislocatedinsouthTexas and was originally cooled by multiple two-pipe indoor air-handler units fed by an air-cooled chiller and gas-fired boiler. Outside air was provided to the air handlers from window louvers and roof vents. Such a ventilation approachisnotrecommendedbytheU.S.DepartmentofDefenseUnifiedFacilitiesCriteria(UFCs),theAmerican Society of Heating, Refrigerating and Air-Conditioning (ASHRAE), or industry standards. The new …

Challenges Faced By Persons With Disabilities Using Self-Service Technologies, Dana Boucher, Neeti Dave, Steven Dedomenic, Kirsten Frey, Morgan Goetz, Charles Gomez, Emily Hamman, Kevin Hitch, Jonah Jordan, Wahaj Khan, Jakob Larsen, Caleb Macadaeg, Justin Macneill, Christina Mangione, Adriene Mannas, Kristen Martin, Madison Myers, Rujuta Patel, Shiv Patel, Brian Peterson, Kaitlyn Roberts, Zachary Sanders, Devin Shah, Ryley White, Kirsten Wozniak, Lindsay Wright, Clarisse Zigan, Justan Zommers, Bradley S. Duerstock

Undergraduate Coursework

Foreseeable game changing solutions to SSTs will allow for better universal access by better implementing features that are easy and intuitive to use from the inception. Additional robotic advancements will allow for better and easier delivery of goods for consumers. Improvements to artificial intelligence will allow for better communication through natural language and alternative forms of communication. Furthermore, artificial intelligence will aid consumers at SSTs by remembering the consumers preferences and needs. With all foreseeable game changing solutions people with disabilities will be consulted when new and improved SSTs are being developed allowing for the SST to maximize its potential.

Experimental Investigation Of Liquid And Vapor Mass Flows In A Parallel Tube Evaporator, Christian Kollik, Andreas Ennemoser, Michael Lang, Raimund Almbauer, Kevin Wimmer, Lukas Dür, Christoph Zainer

International Refrigeration and Air Conditioning Conference

One of the major challenges in the evaluation of an evaporator heat exchanger in refrigeration cycles is to provide reasonable measurement data. Especially if the evaporator is multi-flow and therefore the measurement of the mass flow at one location and the evaluation of the overall energy balance is not sufficient for the characterization of the heat exchanger. In the present work, an evaporator of a capacity of approx. 1.2 kW, consisting of a distributor, a collector and four parallel evaporator tubes in which heat was introduced, was experimentally investigated. The four evaporator tubes made of stainless steel with an inner …

Impact Of Squeezing On The Microstructure Of Thermal Interface Materials, R. Kantharaj, C. Wassgren, A. Morris, A. M. Marconnet

CTRC Research Publications

No abstract provided.

Optimization Of An Embedded Phase Change Material Cooling Strategy Using Machine Learning, M. Bhatasana, A. M. Marconnet

CTRC Research Publications

No abstract provided.

Engineering Design Coaching Tool, Senay Purzer, Jenny Patricia Quintana, Indraneel Lingam

School of Engineering Education Open Educational Resources

The Engineering Design Coaching Tool is an instructional tool designed to elicit student reasoning and guide design decisions. We present the Engineering Design Coaching Tool in a fillable version and in the context of the Solarize Your World curriculum. We recommend using the coaching tool for stimulating learning during formal and informal design review sessions.

Enhancement Of The Critical Heat Flux During The Cooling Of Power Electronics, Yuyang Hu, Oliver Ziegler, Christiane Thomas, Ullrich Hesse, Stefan Wettengel, Andreas Kluge, Lars Lindenmüller, Gerd Fischer

International Refrigeration and Air Conditioning Conference

Semiconductor-based power electronics such as IGBT (insulated-gate bipolar transistor) modules are used in various applications. During their operation, several kilowatts of waste heat are produced in a single module, which must be specifically dissipated in order to guarantee reliable operation. With the trend towards the downsizing of modules and the demand for high power density in the development of new IGBT-modules, there is a need for efficient heat dissipation. Within the scope of a research project the principle of a natural circulation is investigated for the application of cooling power electronics referring to a patent of Fischer, Langebach and Lindenmüller …