cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Full Issue: Journal on Empowering Teaching Excellence, Volume 6, Issue 1, Spring 2022
Creators: name: Utah State University
Publisher: name: Utah State University
Year: 2022

description: The full-length 2022 Special Issue (Volume 5, Issue 3) of the Journal on Empowering Teaching Excellence
Access the online Pressbooks version (with downloadable EPUB format) here.
The Spring 2022 issue begins with research that explores the perceptions of pre-service teachers relative to learning mathematics and science, with suggestions for how findings can impact curriculum and further research. The focus on pre-service teachers continues with research into their sense of self-efficacy with instructional technologies and whether specific techniques increase comfort level with technologies. Next, researchers explore the products that Generation Z students value most in their learning of a second language, including practical language application and engagement with the language culture and its native speakers. Then, college-level educators share a process for implementing problem-based learning (PBL) in higher education, exploring four main ideas of PBL and the role of the educator in its implementation.
Generalized geometry of two-dimensional vacua
Creators: name: Rosa, Dario
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We derive the conditions for unbroken supersymmetry for a Mink_2, (2,0) vacuum, arising from Type II supergravity on a compact eight-dimensional manifold M_8. When specialized to internal manifolds enjoying SU(4)xSU(4) structure the resulting system is elegantly rewritten in terms of generalized complex geometry. This particular class of vacua violates the correspondence between supersymmetry conditions and calibrations conditions of D branes (supersymmetry-calibrations correspondence). Our analysis includes and extends previous results about the failure of the supersymmetry-calibrations correspondence, and confirms the existence of a precise relation between such a failure and a subset of the supersymmetry conditions.
description: 31 pages, 1 figure. v2: minor corrections, references added
Detection of p-mode Oscillations in HD 35833 with NEID and TESS
Creators: name: Gupta, Arvind F.
name: Luhn, Jacob K.
name: Wright, Jason T.
name: Mahadevan, Suvrath
name: Ford, Eric B.
name: Stefansson, Gudmundur
name: Bender, Chad F.
name: Blake, Cullen H.
name: Halverson, Samuel
name: Hearty, Fred R.
name: Kanodia, Shubham
name: Logsdon, Sarah E.
name: McElwain, Michael W.
name: Ninan, Joe P.
name: Robertson, Paul
name: Roy, Arpita
name: Schwab, Christian
name: Terrien, Ryan C.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We report the results of observations of p-mode oscillations in the G0 subgiant star HD 35833 in both radial velocities and photometry with NEID and TESS, respectively. We achieve separate, robust detections of the oscillation signal with both instruments (radial velocity amplitude $A_{\rm RV}=1.11\pm0.09$ m s$^{-1}$, photometric amplitude $A_{\rm phot}=6.42\pm0.60$ ppm, frequency of maximum power $ν_{\rm max} = 595.71\pm17.28$ $μ$Hz, and mode spacing $Δν= 36.65\pm0.96$ $μ$Hz) as well as a non-detection in a TESS sector concurrent with the NEID observations. These data shed light on our ability to mitigate the correlated noise impact of oscillations with radial velocities alone, and on the robustness of commonly used asteroseismic scaling relations. The NEID data are used to validate models for the attenuation of oscillation signals for exposure times $t<ν_{\rm max}^{-1}$, and we compare our results to predictions from theoretical scaling relations and find that the observed amplitudes are weaker than expected by $>4σ$, hinting at gaps in the underlying physical models.
description: 19 Pages, 14 Figures, Appendix
Angular dependence of magnetoresistance in strongly anisotropic quasi-two-dimensional metals for various Landau-level shapes
Creators: name: Mogilyuk, Taras I.
name: Grigoriev, Pavel D.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present the quantum-mechanical calculations of the angular dependence of interlayer conductivity $σ_{zz}(θ)$ in a tilted magnetic field in quasi-2D layered metals. Our calculation shows that the LL shape is important for this angular dependence. In particular, the amplitude of angular magnetoresistance oscillations (AMRO) is much stronger for the Gaussian LL shape than for the Lorentzian. The ratio $σ_{zz}(θ=0)/ σ_{zz}(θ->\pm 90^{\circ})$ is also several times larger for the Gaussian LL shape. AMRO and Zeeman energy splitting lead to a spin current. For typical organic metals and for a medium magnetic field 10T this spin current is only a few percent of the charge current, but its value may almost reach the charge current for special tilt angles of magnetic field. The spin current has strong angular oscillations, which are phase-shifted as compared to the usual AMRO.
description: 8 pages, 3 figures
Improved FastMap
Creators: Mashayekhi, Reza
Publisher: name: University of Alberta Library
Year: 2023

Pathfinding has been an interesting research area throughout the years. Heuristic search algorithms are used to find a path with the minimum length between a start and a goal in a graph, which has applications in GPS navigation and video games. There are different ways to create a heuristic for these search algorithms. Using embeddings is one of the ways to create a heuristic. In this method, an algorithm builds an embedding space for a given graph. Then, distances in the embedding space can be used to compute the heuristic between any two arbitrary vertices in the graph. Embeddings have other applications, like finding the midpoint between states, but here we focus on their use of heuristics. Cohen et al. (2017) introduced FastMap embedding, which provides a consistent heuristic.

This thesis shows that the FastMap heuristic is not as strong as it was originally shown to be. While the median performance is strong, the average is not. We then analyze the FastMap approach. We show that FastMap is an additive heuristic. Also, we generalize the FastMap embedding by generalizing its embedding function and pivot selection methods. We introduce several new embedding functions and pivot selection methods. We show that the new pivot selection methods enable us to use multiple FastMap embeddings together, which was not effective before. Finally, we evaluate the newly created heuristics and show that using differential heuristics and the Heuristic Error pivot selection method improves the FastMap heuristic.
One-Class Support Vector Machine Generative Adversarial Network
Creators: Wang, Siting
Publisher: name: University of Alberta Library
Year: 2023

Generative Adversarial Networks (GAN) are a field of popular generating models, and there are many variants these years. Lim and Ye 2017 proposed the Geometric GAN to connect the network with the geometric interpretation. They update the discriminator based on the algorithm of Support Vector Machines (SVM), Inspired by their work, we proposed a new algorithm using the robust One Class Support Vector Machines. We also proposed that the discriminator should separate the dataset into three groups: the correctly classified real data, the correctly classified generated data, and the incorrectly classified data. By eliminating the space of incorrectly classified data, we can have our discriminator capture more patterns. We tested our model and the Geometric GAN on the MNIST dataset, and our model has better performance in the same setting.
Concurrent infall of satellites: Collective effects changing the overall picture
Creators: name: Trelles, A.
name: Valenzuela, O.
name: Roca-Fábrega, S.
name: Velázquez, H.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: A variety of new physical processes have proven to play an important role in orbital decay of a satellite galaxy embedded inside a dark matter halo but this is not fully understood. Our goal is to assess if the orbital history of a satellite remains unchanged during a concurrent sinking. For this purpose we analyze the impact that the internal structure of the satellites and their spatial distribution inside the host halo may have on the concurrent sinking process due to both mass loss and the combined effect of self-friction, which have not been studied before for concurrent sinking. We set up a set of N-body simulations that include multiple satellites, sinking simultaneously in a host halo and we compare them with models including a single satellite. The main result of our work is that the satellite's accretion history differs from the classical isolated view when we consider the collective effects. The accretion history of each satellite strongly depends on the initial configuration, the number of satellites in the halo at the time of infall and the internal properties of each satellite. We observe that compact satellites in a flat configuration fall slower than extended satellites that have lost mass, showing a non-reported behavior of self-friction. We find that such effects are maximized when satellites are located in a flat configuration. We show that in a flat configuration similar to the Vast Polar Structure, deviations in the apocenters can be of about 30% with respect to the isolated case, and up to 50% on the eccentricities. We conclude that ignoring the collective effects produced by the concurrent sinking of satellite galaxies may lead to large errors in the determination of the merger progenitors properties, making it considerably more challenging to trace back the accretion event. Timing constrains on host density profile may be modified by the effects discussed here.
description: A&A, Forthcoming article Received: 29 March 2022 / Accepted: 26 September 2022 6 pages, 6 figures
title: Mensch-Roboter-Kollaboration (MRK)
title: Gestaltungshilfe für MRK-Anwendungen
titleType: Subtitle
Creators: name: Düngler, Sebastian
Publisher: name: FH Vorarlberg (Fachhochschule Vorarlberg)
Year: 2022
Subjects: subject: 600 Technik, Medizin, angewandte Wissenschaften

description: Die Mensch-Roboter-Kollaboration verspricht, die Leistungsfähigkeit eines Roboters und die Stärken eines Menschen zu kombinieren. Das junge Thema bringt nicht nur Vorteile, sondern auch neue Sicherheitsbestimmungen und aufwändige Validierungsverfahren mit sich, was den Zeitbedarf für die Entwicklung neuer MRK-Applikationen erhöht. Oft ergibt sich erst bei der Validierung, dass die Sicherheitsbestimmungen (meist die biomechanischen Grenzwerte) nicht eingehalten werden können und dadurch Änderungen an der Applikation durchgeführt werden müssen. So bildet sich ein Kreislauf aus „Validieren“ und „Änderungen vornehmen“, der erst nach mehreren Zyklen beendet werden kann. Ziel der vorliegenden Masterarbeit ist es, Empfehlungen zu konzipieren, mit welchen dieser Kreislauf frühzeitig durchbrochen werden kann. Die Arbeit beschränkt sich dabei auf das Leistungs- und Kraftbegrenzungsschutzprinzip. Um den Einfluss unterschiedlicher Parameter, wie beispielsweise die maximale TCP-Geschwindigkeit oder die Greifergeometrie, auf die Kollisionskräfte und Drücke zu erforschen, wurde ein biofideles Messsystem und ein Roboter vom Typ ABB GoFa™ verwendet. Diese Untersuchungen dienen zusammen mit den Sicherheitsbestimmungen als Grundlage der Gestaltungsempfehlungen. Um eine Anwendung der Empfehlungen vorzuzeigen, wird in der vorliegenden Arbeit exemplarisch eine MRK-Applikation gestaltet und validiert
Exploring nitrifier denitrification in Nitrosomonas communis and Nitrosomonas europaea through physiology and proteomic analysis
Creators: Gomes-Yakiwchuk, Sujani
Publisher: name: University of Alberta Library
Year: 2023

The current understanding of how ammonia oxidizing bacteria (AOB) produce the potent greenhouse gas nitrous oxide is incomplete and inaccurate since most studies are focused on the model organism for the group, Nitrosomonas europaea, which does not represent the physiological diversity of AOB. Since AOB are recognized as significant contributors to global nitrous oxide emissions, it is imperative that we study more species of AOB to refine our mechanistic understanding of how they produce nitrous oxide at the molecular level. efining this knowledge is necessary for making informed decisions about increasing the sustainability of the processes on which AOB have a major impact, such as agriculture and wastewater treatment. The overall goal of this study was to uncover the enzymes involved in the production of nitrous oxide in the ammonia oxidizing bacterium, Nitrosomonas communis, which retains the ability to produce nitrous oxide despite lacking the canonical nitrite reductase (NirK) that was thought to be essential for this process. To confirm the ability of N. communis to produce nitrous oxide, the growth of the strain was observed in batch cultures where oxygen and the growth substrate, ammonium, were limited. Nitrite and nitrous oxide production were correlated with the consumption of ammonia and oxygen with nitrous oxide production starting at the onset of hypoxia. To ensure that the observed nitrous oxide production was from enzymatic nitrite reduction, resting cell assays were conducted where stationary phase cells were

 removed from growth medium and incubated in small vials with an external reductant (PMS + Ascorbic acid, or hydrazine) under anoxia. Nitrous oxide was observed only in vials containing live cells. While the nitrous oxide-producing ability of N. communis was confirmed, it was also observed that the amounts of N2O produced were much less than the amounts

produced by N. europaea under the same conditions,  suggesting that the enzymology for nitrous oxide production was different between the two species. This was confirmed by examining the proteome of N. communis and N. europaea at mid-log phase and stationary phase. The canonical nitrite reductase, NirK, and nitric oxide reductase, NorB, were not present in the N. communis proteome in contrast to that of N. europaea. Candidates for an alternate nitrite reductase were identified in the N. communis proteome along with several cytochromes that are speculated to contribute to nitrous oxide production. While further research is necessary to confirm the role of these candidate enzymes in nitrous oxide production, this study highlights the metabolic diversity of AOB and the need to study more of them to further understand the microbial processes that contribute to greenhouse gas  production.
Manufacturing and evaluation of the tensile properties of 3D printed human hair reinforced composites
Creators: Boyala, Gowtham
Publisher: name: University of Alberta Library
Year: 2023

This thesis proposes a novel method to 3D print human hair-based polymer composites. Human hair is a biological fiber whose microstructure is well-defined. It possesses high tensile strength, thermal insulation, a unique chemical composition, and elastic recovery, among other qualities. However, its delayed breakdown causes numerous environmental issues. Although there are many viable applications for hair, it is still regarded as biological waste. In light of this, this study aims to investigate the feasibility of producing a class of polymer composites reinforced with short human hair fibers and continuous human hair fibers using SLA 3D printing technique. The first study used short human hair fibers to 3D print polymer composites as a proof of concept. Short human hair fiber-reinforced composites in the weight percentage of 1,5,10,15, and 20 were fabricated, and a tensile test was performed to determine the ultimate tensile strength of the composites. Although the concept of 3D printing natural fibers using SLA 3D printing was successfully proved, the strength of the fabricated composite specimens was substantially low compared to the neat polymer specimen due to the presence of voids and poor interfacial adhesion between the fiber and the matrix. Hence in the second study, the focus was to develop effective surface treatment techniques to improve the interfacial adhesion between the fiber and the matrix. The second study also investigates using continuous human hair fibers instead of short human hair fibers to fabricate composites using 3D printing. Human hair fibers were modified by grafted with MA-POSS and cold air plasma treatment. The effect of the surface treatment was investigated by performing single-hair pull-out tests. Post surface modification, human hair fibers were used to 3D print tensile specimens using SLA 3D printing to determine the effect of surface treatment of the fibers.  SEM and an optical microscope were used to study the surface morphology of the modified fibers. XPS was performed to confirm the grafting of MA-POSS on the human hair fibers. Voids, fiber volume, and fiber orientation were determined by performing Micro-CT.
Bivelocity picture in the nonrelativistic limit of relativistic hydrodynamics
Creators: name: Koide, Tomoi
name: Ramos, Rudnei O.
name: Vicente, Gustavo S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We discuss the nonrelativistic limit of the relativistic Navier-Fourier-Stokes (NFS) theory. The next-to-leading order relativistic corrections to the NFS theory for the Landau-Lifshitz fluid are obtained. While the lowest order truncation of the velocity expansion leads to the usual NFS equations of nonrelativistic fluids, we show that when the next-to-leading order relativistic corrections are included, the equations can be expressed concurrently with two different fluid velocities. One of the fluid velocities is parallel to the conserved charge current (which follows the Eckart definition) and the other one is parallel to the energy current (which follows the Landau-Lifshitz definition). We compare this next-to-leading order relativistic hydrodynamics with bivelocity hydrodynamics, which is one of the generalizations of the NFS theory and is formulated in such a way to include the usual mass velocity and also a new velocity, called the volume velocity. We find that the volume velocity can be identified with the velocity obtained in the Landau-Lifshitz definition. Then, the structure of bivelocity hydrodynamics, which is derived using various nontrivial assumptions, is reproduced in the NFS theory including the next-to-leading order relativistic corrections.
description: 10 pages, replaced with published version in the Brazilian Journal of Physics
A Deep Learning Approach for Automatic Image Reconstruction in MPI
Creators: name: Knopp, Tobias
name: Jürß, Paul
name: Grosser, Mirco
Publisher: name: International Journal on Magnetic Particle Imaging IJMPI
Year: 2023

description: Image reconstruction in magnetic particle imaging is a challenging task because the optimal image quality can only be obtained by tuning the reconstruction parameters for each measurement individually. In particular, it requires a proper selection of the Tikhonov regularization parameter. In this work we propose a deep-learning-based post-processing technique, which removes the need for manual parameter optimization. The proposed neural network takes several images reconstructed with different parameters as input and combines them into a single high-quality image.
description: International Journal on Magnetic Particle Imaging IJMPI, Vol 9 No 1 Suppl 1 (2023)
First-principles Fermi acceleration in magnetized turbulence
Creators: name: Lemoine, Martin
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: This work provides a concrete implementation of E. Fermi's model of particle acceleration in magnetohydrodynamic (MHD) turbulence, connecting the rate of energization to the gradients of the velocity of magnetic field lines, which it characterizes within a multifractal picture of turbulence intermittency. It then derives a transport equation in momentum space for the distribution function. This description is shown to be substantiated by a large-scale numerical simulation of strong MHD turbulence. The present, general framework can be used to model particle acceleration in a variety of environments.
description: to appear in Phys. Rev. Lett. -- includes supplemental material in appendix
Adversarial Multiple Access Channels with Individual Injection Rates
Creators: name: Anantharamu, Lakshmi
name: Chlebus, Bogdan S.
name: Rokicki, Mariusz A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: We study deterministic distributed broadcasting in synchronous multiple-access channels. Packets are injected into $n$ nodes by a window-type adversary that is constrained by a window $w$ and injection rates individually assigned to all nodes. We investigate what queue size and packet latency can be achieved with the maximum aggregate injection rate of one packet per round, depending on properties of channels and algorithms. We give a non-adaptive algorithm for channels with collision detection and an adaptive algorithm for channels without collision detection that achieve $O(\min(n+w,w\log n))$ packet latency. We show that packet latency has to be either $Ω(w \max (1,\log_w n))$, when $w\le n$, or $Ω(w+n)$, when $w>n$, as a matching lower bound to these algorithms. We develop a non-adaptive algorithm for channels without collision detection that achieves $O(n+w)$ queue size and $O(nw)$ packet latency. This is in contrast with the adversarial model of global injection rates, in which non-adaptive algorithms with bounded packet latency do not exist (Chlebus et al. Distributed Computing 22(2): 93 - 116, 2009). Our algorithm avoids collisions produced by simultaneous transmissions; we show that any algorithm with this property must have $Ω(nw)$ packet latency.
Transportation Vulnerability Analysis for Wildfire Evacuations
Creators: Zahid, Abdullah Al
Publisher: name: University of Alberta Library
Year: 2023

Wildfires are a natural part of Canadian ecosystems, but sometimes pose a threat to people.  In Canada, when public safety is threatened by a wildfire encroaching into the wildland-urban interface (WUI), local authorities will typically recommend and lead evacuation of the area. During evacuations, roadway egress capacity has an important influence on evacuation efficacy. If the fire spreads quickly toward the community and egress capacity is insufficient, public safety can be compromised. We identify communities in Alberta (a province in western Canada) that are vulnerable to wildfire due to the configuration of the transportation network in relation to surrounding wildfire potential. Based on the existing literature, we first used metrics applied in  Geographic Information Systems (i.e., GIS) to identify communities that are vulnerable for wildfire evacuation due to the geometric layout of their surrounding road network. Then to perform our analysis, 21 potentially vulnerable communities were selected based on expert input. We plotted fire hazard and transportation facility capacities for each community, and coupled and compared estimated fire travel times and evacuation travel times in a directional, scenario-based approach, to understand the potential for community egress against fire encroachment. Our results show that some communities (mainly within the boreal forest and Rocky Mountain foothills) have egress routes highly exposed to potential fire. Our findings also indicate that evacuation timing for some larger communities may be considered for further investigations, given relationships between estimated fire travel times and evacuation times. This work contributes an interdisciplinary assessment of community directional vulnerabilities for wildfire evacuation, bringing together wildland fire science and transportation engineering. To bridge research and practice, the results are presented in an interactive online map, and can be used to inform evacuation preparedness planning and proactive mitigation efforts.
A Lean Approach to System Design and the Development of a Multi-Stage Dredging System for Commercial Applications
Creators: Dyck, Caleb B
Publisher: name: University of Alberta Library
Year: 2023

The development of any technology requires that a balance must be struck between  meeting requirements and dealing with constraints. This thesis presents a lean approach to the initial design and development of a complex, multi-physics system for industrial implementation, undertaken due to constraints on resources and time, to manage economic, human, and technical risks associated with the project’s requirements. Through this method, we identify and explain the major effects on the system which should be investigated in further study to reduce or retire risks in implementation.

A case study and a descriptive system design are presented for a novel dredge technology that utilizes a cable-driven propulsion system to position a dredge head along a predetermined path. To date, this dredge system has provided adequate performance. Improving the system’s automatic controller is the next step in the system’s development. The design case simplifies component models to identify system parameters that show high sensitivity, and to identify areas of the system that require particular care in future study. Because engineering analysis cannot make accurate predictions for these models, some of the simplified models were tested through a lean experimental design. Three parameters were tested: (1) dredge head velocity; (2) depth of the dredge head; and (3) rotational speed of the dredge pump. Both dredge head velocity and dredge head depth show a positive relationship to dredge production within the simplified system model.

The lean approach is an initial design step to provide the engineer with an understanding of system behavior related to key requirements in a way that can be used to target areas of key interest in a later, more comprehensive design study. This initial lean approach is typically used in organizations with limited resources as it is focused on reducing design costs and risks associated with complex system design.
The Gut Microbiome Modulates the Functionality of CD71+ Erythroid Cells in the Newborn
Creators: Bahojb Habibyan, Yasaman
Publisher: name: University of Alberta Library
Year: 2023

Mounting preclinical and clinical evidence strongly supports the crucial role of the gut microbiota in health. A dysbiosis of the microbiome, an imbalance of the microbial populations, may predispose newborns to develop various immune disorders later in life, such as Inflammatory Bowel Disease (IBD) and Type 1 Diabetes (T1D). Thus, it is fundamental to investigate the mechanism by which the immune system can tolerate and coexist with the microbiome. It has been shown that CD71+ erythroid cells (CECs) are abundant in newborns relative to adults. The removal of CECs from the intestinal tissues by the anti-CD71 antibody disrupts immune homeostasis and results in inflammation. This suggests an essential role for CECs in the adaptation of newborns to colonization with microbial communities.

Therefore, I sought to characterize CD45- and CD45+ CECs in the gut and spleen of newborn mice. I looked at the expression of V-domain immunoglobulin suppressor of T cell activation (VISTA), transforming growth factor-beta (TGF-), reactive oxygen species (ROS), and arginase-1. I found that CD45+ CECs in newborns had higher expression of all measured immune factors relative to CD45- CECs in both the gut and the spleen. I next sought to characterize CD45- and CD45+ CECs in SPF and GF mice. I found that CD45- and CD45+ CECs from germ-free (GF) mice significantly lower the expression of immune mediators relative to specific-pathogen-free (SPF) mice. I next assessed the expression of toll-like receptors (TLRs) by CECs in SPF mice. I found that CD45+ CECs had significantly higher expression of TLRs relative to CD45- CECs. These findings indicate that CECs, specifically the CD45+ CECs are capable of microbial sensing and differ phenotypically in the absence of the microbiome. Finally, I explored whether a single depletion of CD71 on day 3 was sufficient to cause long-term microbial dysbiosis by either day 22 or day 36. I found that a single early depletion of CD71 did not result in long-term microbial dysbiosis by day 22. However, interestingly, by day 36 I found significant differences in beta diversity. These preliminary findings indicate that there is an interaction between CECs and the microbiome in early life. These results may be combined with ongoing research to potentially identify a novel and critical role for CECs in immune tolerance and microbial dysbiosis.
Additive Manufacturing and Other Techniques for Fabrication of Foams and Electrically Conductive Polymer Composites
Creators: Ostashek, Adam N
Publisher: name: University of Alberta Library
Year: 2023

In this thesis, two aspects of advanced uses for additive manufacturing and microfabrication are investigated: stretchable electronics and polymer foams. These topics were initially part of an extended project effort to develop new capabilities in deformable, high-frequency antennas and the ability to rapidly prototype using combinations of materials that had previously required complex hand assembly. Several methods were investigated in which stretchable electronic devices were fabricated. A horn antenna with a reconfigurable reflector was designed and fabricated using EcoFlex silicone rubber and eutectic gallium indium (eGaIn) to comprise the deformable reflector. A method to produce stretchable electrical wires using an inexpensive consumer-grade fused deposition manufacturing (FDM) 3D printer was developed. Electrically conductive wires, a resistive spiral pressure sensor, and an inductive spiral strain sensor were printed and characterized. Electrical conductivity was achieved in all of the printed devices up to an elongation of 500 %. The utility of foams in this work are that the structural materials reduce their impact on the high frequency performance of electronics, as air has lower inherent losses than solid materials. Foams are also highly useful for lightweight printing applications or in industries like metal casting, where lost foam casting is a common way to produce complex metal parts. The sections of this thesis that discuss foams pertain to applications in functionally graded materials, where the amount of porogen can be varied throughout the thickness of the foam, and applications in the foundry industry. Several foams made from poly(styrene-b-(ethylene-co-butylene)-b-styrene) (SEBS), poly(lactic acid) (PLA), and linear low density polyethylene (LLDPE) were produced and investigated for extensibility and applicability to the lost foam metal casting process. SEBS foams were successfully fabricated via solution casting using widely available, inexpensive soluble templates. A commercially available foaming PLA filament was used to make an expendable pattern for a grey iron casting and the final product was visually characterized. Custom LLDPE filaments containing chemical foaming agents were produced and investigated for their applicability as an alternative material for lost foam patterns.
Sparse view sinogram restoration network for improving temporal resolution of projection magnetic particle imaging
Creators: name: Wu, Xiangjun
name: Jiang, Jingying
name: Hui, Hui
name: Tian, Jie
Publisher: name: International Journal on Magnetic Particle Imaging IJMPI
Year: 2023

description: The acquisition views of projection magnetic particle imaging (MPI) limit the temporal resolution of tomographic imaging. When the views of projection are insufficient (sparse view), the streaking artifacts will be introduced after filtered back-projection. The current solutions to the sparse view problem in computed tomography can be divided into three categories, iterative reconstruction, image post-processing, and sparse view sinogram restoration. The first one is computationally intensive and the parameters are difficult to determine. The latter two are data-driven deep learning methods that require large-scale trainable datasets. However, the complex features of the image domain will make the network easy to overfit. Therefore, we propose a sparse view sinogram restoration network for MPI to improve the temporal resolution of tomography. We validate the effectiveness of the proposed method on a simulated dataset and outperform iterative reconstruction and image post-processing methods.
description: International Journal on Magnetic Particle Imaging IJMPI, Vol 9 No 1 Suppl 1 (2023)
Swirling around filaments: are large-scale structure vortices spinning up dark halos?
Creators: name: Laigle, Clotilde
name: Pichon, Christophe
name: Codis, Sandrine
name: Dubois, Yohan
name: Borgne, Damien le
name: Pogosyan, Dmitri
name: Devriendt, Julien
name: Peirani, Sebastien
name: Prunet, Simon
name: Rouberol, Stephane
name: Slyz, Adrianne
name: Sousbie, Thierry
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The kinematic analysis of dark matter and hydrodynamical simulations suggests that the vorticity in large-scale structure is mostly confined to, and predominantly aligned with their filaments, with an excess of probability of 20 per cent to have the angle between vorticity and filaments direction lower than 60 degrees relative to random orientations. The cross sections of these filaments are typically partitioned into four quadrants with opposite vorticity sign, arising from multiple flows, originating from neighbouring walls. The spins of halos embedded within these filaments are consistently aligned with this vorticity for any halo mass, with a stronger alignment for the most massive structures up to an excess of probability of 165 per cent. On large scales, adiabatic/cooling hydrodynamical simulations display the same vorticity in the gas as in the dark matter. The global geometry of the flow within the cosmic web is therefore qualitatively consistent with a spin acquisition for smaller halos induced by this large-scale coherence, as argued in Codis et al. (2012). In effect, secondary anisotropic infall (originating from the vortex-rich filament within which these lower-mass halos form) dominates the angular momentum budget of these halos. The transition mass from alignment to orthogonality is related to the size of a given multi-flow region with a given polarity. This transition may be reconciled with the standard tidal torque theory if the latter is augmented so as to account for the larger scale anisotropic environment of walls and filaments.
description: 17 pages, 19 figures, 3 tables. accepted for publication in MNRAS
Supplemental File from Effects of response format on achievement and aptitude assessment results: multilevel random effects meta-analyses
Creators: name: Breuer, Sonja
name: Scherndl, Thomas
name: Ortner, Tuulia M.
Publisher: name: The Royal Society
Year: 2023
Subjects: subject: 170299 Cognitive Science not elsewhere classified
subject: FOS: Psychology
subject: 179999 Psychology and Cognitive Sciences not elsewhere classified
subject: 60801 Animal Behaviour
subject: FOS: Biological sciences

description: Supplemental File with additional tables and figures
title: Carl Pause: Spätmittelalterliche Glasfunde aus Venedig. Ein archäologischer Beitrag zur deutsch-venezianischen Handelsgeschichte
Creators: name: Schmaedecke, Michael
Publisher: name: University Library Heidelberg
Year: 2014

description: Rezension zu: Carl Pause: Spätmittelalterliche Glasfunde aus Venedig. Ein archäologischer Beitrag zur deutsch-venezianischen Handelsgeschichte. Universitätsforschungen zur prähistorischen Archäologie, Band 28. Aus dem Institut für Ur- und Frühgeschichte der Universität Freiburg i. Br. Dr. Rudolf Habelt GmbH. Bonn 1996. ISBN 3774927448
Open clusters housing classical Cepheids in Gaia DR3
Creators: name: Hao, C. J.
name: Xu, Y.
name: Wu, Z. Y.
name: Lin, Z. H.
name: Bian, S. B.
name: Li, Y. J.
name: Liu, D. J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The latest Gaia Data Release 3 provides an opportunity to expand the census of Galactic open clusters harboring classical Cepheid variables, thereby bolstering the cosmic distance scale. A comprehensive analysis yielded a total of 50 classical Cepheids associated with 45 open clusters, of which 39 open cluster-classical Cepheid pairs are considered probable, with the remaining 11 pairs considered improbable but worth following up. Two previously identified clusters by us possibly host classical Cepheids (OC-0125/V1788 Cyg and OC-0675/OGLE-BLG-CEP-114). In addition, we identify 38 new open cluster candidates within the Galactic disk.
description: 14 pages, 4 figures, Accepted for publication in A&A
title: The impact of organizational citizenship behavior for the environment on corporate sustainability
title: An explorative study of multinational corporations in the DACHL region
titleType: Subtitle
Creators: name: Rusch, Regina
Publisher: name: FH Vorarlberg (Fachhochschule Vorarlberg)
Year: 2022
Subjects: subject: 300 Sozialwissenschaften

description: Today, many businesses increasingly engage in pro-environmental activities to face environmental challenges such as pollution or climate change. In addition to formal management practices, employees are impacting environmental advances with voluntary pro-environmental activities, also known as Organizational Citizenship Behavior for the Environment. The purpose of this master thesis is to explore factors that could influence employees’ engagement in Organizational Citizenship Behavior for the Environment. For this aim, five semi-structured interviews were carried out with multinational corporations from the DACHL region. The results show that certain leadership styles, corporate culture, a sustainability-driven mindset, environmental concern, communication and motivation can influence employees’ engagement in Organizational Citizenship Behavior for the Environment. In addition, the cumulative effect of small initiatives seems to considerably impact environmental sustainability. In contrast to past research on this topic, this study takes a qualitative approach to explore different influencing factors of Organizational Citizenship Behavior for the Environment. In addition, the study focuses on businesses located in the DACHL region.
High-order Debye model for nanoparticle magnetization in magnetic particle imaging
Creators: name: Li, Yimeng
name: Zhang, Peng
name: Feng, Xin
name: Hui, Hui
name: Tian, Jie
Publisher: name: International Journal on Magnetic Particle Imaging IJMPI
Year: 2023

description: Magnetic particle imaging (MPI) is a new medical modality to safely and sensitively image the concentration distribution of superparamagnetic iron-oxide nanoparticle (SPIO). It relies on the nonlinear magnetization response of SPIO under time-varying magnetic field to induce output voltage signal. When the multidimensional magnetic fields are applied in MPI, the commonly used first-order Debye model decreases accuracy in modeling the magnetization of SPIO. To solve this problem, we propose a high-order Debye model, which considers the contribution of each dimensional magnetic field on the magnetization of SPIO. Through various experiments, the proposed high-order Debye model shows superiority over the first-order Debye model, with 30% lower root-mean-square error in modeling the magnetization. Using the high-order Debye model, the influence of different magnetic fields on the SPIO can be accurately analyzed, and this model can further provide guidance for MPI instrument optimization.
description: International Journal on Magnetic Particle Imaging IJMPI, Vol 9 No 1 Suppl 1 (2023)
The $σ_{\rm Hβ}$-based dimensionless accretion rate and its connection with the corona for AGN
Creators: name: Chen, Y. Q.
name: Liu, Y. S.
name: Bian, W. H.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: With respect to the $\rm Hβ$ full width at half-maximum ($\rm FWHM_{Hβ}$), the broad $\rm Hβ$ line dispersion ($σ_{\rm Hβ}$) was preferred as a velocity tracer to calculate the single-epoch supermassive black hole mass ($M_{\rm BH}$) suggested by \cite{Yu2020b}. For a compiled sample of 311 broad-line active galactic nuclei (AGN) with measured hard X-ray photon index ($z<0.7$), $σ_{\rm Hβ}$ and the optical Fe II relative strength ($R_{\rm Fe}$) are measured from their optical spectra, which are used to calculate $σ_{\rm Hβ}$-based virial $M_{\rm BH}$ and dimensionless accretion rate ($\dot{\mathscr{M}}$). With respect to $\rm FWHM_{\rm Hβ}$, it is found that the mean value of $σ_{\rm Hβ}$-based $M_{\rm BH}$ is on average larger by 0.26 dex, and the mean value of $σ_{\rm Hβ}$-based $\dot{\mathscr{M}}$ is on average smaller by 0.51 dex. It is found that there exists a non-linear relationship between the Eddington ratio ($L_{\rm Bol}/L_{\rm Edd}$) and $\dot{\mathscr{M}}$, i.e., $L_{\rm Bol}/L_{\rm Edd} \propto \dot{\mathscr{M}}^{0.56\pm 0.01}$. This non-linear relationship comes from the accretion efficiency $η$, which is smaller for AGN with higher $\dot{\mathscr{M}}$. We find a strong bivariate correlation of the fraction of energy released in the corona $F_{\rm X}$ with $\dot{\mathscr{M}}$ and \mbh, $F_{\rm X} \propto \dot{\mathscr{M}}^{-0.57\pm 0.05} M_{\rm BH}^{-0.54\pm 0.06}$. The flat slope of $-0.57\pm 0.05$ favours the shear stress tensor of the accretion disk being proportional to the geometric mean of gas pressure and total pressure. We find a strong bivariate relation of $Γ$ with $\dot{\mathscr{M}}$ and $F_{\rm X}$, $Γ\propto \dot{\mathscr{M}}^{-0.21\pm 0.02}F_{\rm X}^{0.02\pm 0.04}$. The hard X-ray spectrum becomes softer with increasing of $F_{\rm X}$, although the scatter is large.
description: 18 pages, 9 figures, ApJ, in press
N=1 Gribov superfield extension
Creators: name: Amaral, M. M.
name: Chifarelli, Y. E.
name: Lemes, V. E. R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We propose a mechanism displaying confinement, as defined by the behavior of the propagators, for 4 dimensional, N = 1 supersymmetric Yang-Mills theory in superfield formalism. In this work we intend to verify the possibility of extending the known Gribov problem of quantization of Yang-Mills theories and the implementation of a local action with auxiliary superfields like Gribov-Zwanziger approach to this problem.
description: 11 pages, no figures
title: Drei neuaufgedeckte gotische Wandmalereien zu Kohlstetten, Riederich und Altingen
Creators: name: Hoffmann, Herbert
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 2, Nr. 1 (1959): Nachrichtenblatt der Denkmalpflege in Baden-Württemberg – Organ der Staatlichen Ämter für Denkmalpflege, Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
title: Methods to increase employee engagment in international problem solving meetings
title: Recommendations for leaders
titleType: Subtitle
Creators: name: Harteneck, Stefan
Publisher: name: FH Vorarlberg (Fachhochschule Vorarlberg)
Year: 2022
Subjects: subject: 100 Philosophie und Psychologie
subject: 300 Sozialwissenschaften

description: In the current international business environment employees are spending large amounts of their time in meetings. More than ever these meetings take place remotely and often have the problem that individuals in the meeting do not share information or opinions. Employees often stay in muted in meetings and allow one or two participants to drive the conversation. This habit is especially troublesome for problem solving meetings. Problem solving meetings invite individuals from different disciplines to share and brainstorm possible causes for issues related to poor company outcomes. Active and open contribution from all members is required to achieve the group goals. This study aims to find methods that will increase contribution amongst meeting participants in regular meetings as well as problem solving meetings. The study tested sixteen topics for their influence on contribution in meetings. This was done in a survey, that was distributed within a multination engineering corporation, and on LinkedIn. There was a total of 68 responses. These responses were then separated by above average and below average participation in problem solving meetings. Hypothesis testing was done on the total group and separately on the problem-solving group. Employee participation in decision making and psychological safety were found to correlate highly with Contribution in meetings for both groups. Psychological safety was found to be of even greater importance to problem solving group. This study demonstrates that to increase contribution in meetings, leaders should provide a psychologically safe climate where employees share in the decision making. Furthermore, a psychologically safe environment is critical in problem solving meetings where members of different disciplines with low familiarity take part.
title: Das Verwaltungsgericht entscheidet... Das Schwabenhaus-Urteil
Creators: name: Krins, Hubert
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 5, Nr. 1 (1976), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4