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Digital Modeling of Regolith Flowability Using Stochastic Modeling and Discrete Element Method – a Concept
Full text linkTobias Lamping, TU Braunschweig, Institut für Partikeltechnik, GermanyKonstantinos Giannis, TU Braunschweig, Institut für Partikeltechnik, GermanyCarsten Schilde, TU Braunschweig, Institut für Partikeltechnik, GermanyMatthias Weber, Ulm University, GermanyOrkun Furat, Ulm University, GermanyVolker Schmidt, Ulm University, GermanyTehya Birch, Airbus Defence and Space, GermanyAchim Seidel, Airbus Defence and Space, GermanyEmanuele Monchieri, Airbus Defence and Space, GermanyMarkus Franz, Airbus Defence and Space, GermanyUrs Peuker, TU Bergakademie Freiberg, Institute of Mechanical Process
Engineering and Mineral Processing, GermanyRalf Ditscherlein, TU Bergakademie Freiberg, Institute of Mechanical Process
Engineering and Mineral Processing, GermanyLisa Ditscherlein, TU Bergakademie Freiberg, Institute of Mechanical Process
Engineering and Mineral Processing, GermanyGeorg Pöhle, Fraunhofer Institute for Manufacturing Technology and
Advanced Materials IFAM, GermanyChristian Redlich, Fraunhofer Institute for Manufacturing Technology and
Advanced Materials IFAM, GermanyICES510: Planetary and Spacecraft Dust Properties and
Mitigation TechnologiesThe 54th International Conference on Environmental Systems was held in Prague, Czechia, on 13 July 2025 through 17 July 2025.For future extended lunar missions, the in-situ production
of oxygen from lunar regolith via resource utilization
(ISRU) is of critical importance. A comprehensive
understanding of regolith behavior during handling,
transport and processing is required to realize this
potential. Addressing fundamental gaps in the flow
characteristics of lunar regolith – particularly arising
from its angular particle morphology and complex
interparticle mechanics – is therefore essential. This
presentation, forming part of the Universal Predictors of
Regolith Behavior (UPREB) series, examines the combined use
of stochastic modeling and the discrete element method
(DEM) to elucidate regolith flowability. Initially,
particle geometries are statistically analyzed and
reconstructed from micro‐computed tomography data by means
of stochastic geometry models, thereby yielding
representative virtual particles. DEM simulations then
predict regolith behavior under lunar gravity and vacuum
conditions with minimal terrestrial experimentation. To
ensure predictive fidelity, the DEM framework is calibrated
against key experimental metrics, notably static angle of
repose and shear cell measurements. The methods presented
in this work form the basis of a virtual materials testing
approach to investigate the relationship between geometric
properties of regolith, environmental conditions and
effective properties
Reframing Teacher Mindsets: Developing Teacher Self-Efficacy to Serve Economically Disadvantaged and Minority Students
Full text linkThis study sought to explore the impact of building self-efficacy in teachers on improving instructional practices to meet the diverse learning needs of economically disadvantaged and minority students. Research shows the academic achievement gap among economically disadvantaged and minority students have been historically persistent in the United States. To effectively address gaps in learning, it is necessary to target teacher mindsets, with the focus on developing a level of self-efficacy in teachers that improves their capacity to implement effective instructional strategies that meet the needs of economically disadvantaged and minority students. Through targeted professional development sessions focused on deconstructing deficit thinking and building teacher self-efficacy, and collaborative discussions around building capacity to identify and implement highly engaging and culturally responsive practices, this study focused on reframing teacher mindsets to minimize and/or eliminate the influence of implicit and explicit biases on teachers’ belief and capacity to foster equitable and inclusive classroom environments for economically disadvantaged and minority students. This study was conducted using a design-development intervention study model with embedded action research elements through the framework of self-efficacy theory to develop and design interventions. This design-development intervention study utilized professional development sessions and collaborative discussions with teachers to tailor interventions to target harmful mindsets and build capacity for implementing instructional strategies aligned with students’ learning needs to address student learning gaps. The hope was that the findings of this study showed that guiding teachers to reframe their thinking regarding teaching economically disadvantaged and minority students can help build teacher self-efficacy and capacity to improve instructional practices to effectively meet the learning needs of students
Understanding Agricultural Education Needs of Military Veteran Farmers: Characteristics, Motivations, and Preferences
Full text linkThe security of the U.S. food supply is essential to national stability, yet the agricultural sector faces a labor shortage due to an aging producer population and heavy reliance on foreign labor. The U.S. government has identified military veterans as a vulnerable group deserving of agricultural education. Existing literature primarily emphasizes the mental health benefits of agriculture for veterans, overlooking their potential contributions to agricultural production.
This study applies self-directed learning (SDL) theory to examine how military veterans engage in agricultural education through nonformal learning environments. While SDL research has traditionally focused on formal higher education using qualitative methods, this study employs a quantitative approach to describe the military veteran farmer seeking agricultural education outside formal institutions. A survey instrument, adapted from academic and governmental sources, was distributed through nonprofit organizations supporting veteran farmers.
The findings provide a comprehensive profile of veteran farmers, detailing their general demographics, military backgrounds, agricultural experience, and learning preferences. Understanding these factors is critical for developing effective agricultural education programs tailored to veterans' needs. By addressing gaps in SDL research and agricultural workforce development, this study offers insights for policymakers, educators, and organizations supporting veterans’ transition into agriculture. Further research is recommended to enhance program effectiveness and expand educational opportunities for this unique learner demographic
Experimental Evaluation of an EM Centrifugal Pump Developed According to Orion’s ESM ATCS Needs
Full text linkGheorghe Megherelu, Romanian R&D Institute for Gas Turbines COMOTI, RomaniaDragos Mihai, Romanian R&D Institute for Gas Turbines COMOTI, RomaniaCristian Dobromirescu, Romanian R&D Institute for Gas Turbines COMOTI, RomaniaIonut-Florian Popa, Romanian R&D Institute for Gas Turbines COMOTI, RomaniaIulia Tinca, Romanian R&D Institute for Gas Turbines COMOTI, RomaniaICES103: Thermal Control of Commercial and Exploration
Spacecraft and Surface HabitatsThe 54th International Conference on Environmental Systems was held in Prague, Czechia, on 13 July 2025 through 17 July 2025.The current developments in terms of space equipment
require more versatile thermal control systems, capable of
rejecting high heat quantities. This can be done by means
of passive or active thermal systems, which, besides
typical solutions (coatings, MLI, radiators, etc.),
requires either Loop Heat Pipes (LHP) or Mechanically
Pumped Fluid Loops (MPFL). One application which requires
such active thermal control is the ESM module of the MPCV
Orion spacecraft, as part of one of the main international
space programs (Artemis) currently undergoing as a
collaboration between NASA and ESA, with the goal to bring
the first people back to Moon surface after more than 50
years. Following closely this topic, COMOTI, the Romanian
R&D Institute for Gas Turbines, is currently developing a
centrifugal pump capable of meeting the ESM MPFL system
requirements. The pump is a canned centrifugal type,
designed to run with HFE-7200, with a duty point of 750
kg/h and 2.13 bard pressure rise. This one was developed in
several stages, starting from initial design iterations
(analytical calculus and CFD studies), and afterwards
focusing on a comprehensive experimental evaluation with
tests performed on demonstrators relevant for the hydraulic
part/motor, and finally characterization of the performance
in relevant environment at pump level on a dedicated
dismountable EM (Engineering Model). The current paper
addresses the approach followed for the development and
experimental evaluation of the pump, presenting each step
performed and main conclusions
Conflict (Galatians 2:11-16).
No full textVideo format available at: https://hdl.handle.net/2346/10209
An Annotated Catalogue of Costa Rican Music for Violin and Piano
Full text linkThis research documents and analyzes 107 Costa Rican violin and piano compositions by 40 composers over a span of 150 years, from October 1875 to January 2025, culminating in a comprehensive annotated catalogue. It includes numerous underperformed and unrecorded works, aiming to enhance accessibility and engagement with this repertoire from underrepresented composers. Through analysis and cultural investigation, the study explores the evolution of Costa Rican music, drawing on archival materials from the Historic Musical Archive at the University of Costa Rica, the National Library of Costa Rica, private collections, and interviews with 19 composers and 9 performers to provide context and insights. The resulting catalogue, which includes biographical and bibliographical details of these compositions, can serve as a valuable resource for performers, researchers, and educators
Terrestrial Invertebrate Communities Associated with Rio Grande Wild Turkey Habitat in the Edwards Plateau Ecoregion of Texas
No full textRio Grande wild turkeys (Meleagris gallopavo intermedia, RGWT) require invertebrate prey to fulfill protein and energetic demands associated with critical life periods. In the Edwards Plateau Ecoregion (EPE), the South Llano River (SLR) and North Llano River (NLR) experience contrasting hydrologic flows (i.e., perennial and intermittent, respectively) which create habitat conditions in aquatic and terrestrial ecosystems that facilitate terrestrial, semi-aquatic, and aquatic invertebrate availability and biomass. No current information exists on the baseline ecological invertebrate components nor invertebrate forage selection by RGWT in the EPE. Therefore, to fill this research gap, we established two paired 40-meter transects across upland and riparian habitats at five sites with known occurrences of RGWT, three on the SLR and two on the NLR within Kimble County, Texas. Sampling transects included nine pitfall traps and a 10-meter sweep net sample in herbaceous vegetation, collected every 13-15 days from April – July in 2023 and 2024. We identified 205 unique invertebrate families among upland and riparian areas in the NLR and SLR watersheds and additionally documented 252 species with first time county reports in iNaturalist. We detected 1.6-times more individual invertebrates in riparian habitats but a similar number of invertebrate families between riparian and upland sites (177 > 168, riparian > upland) with approximately 76% of all collected individuals represented by three orders (Coleoptera, Hemiptera, and Hymenoptera respectively, excluding Isopoda). The numerically dominant invertebrate families collected across riparian and upland habitats included Armadillidiidae, Formicidae, Lygaeidae, Scarabaeidae, Gryllidae, Tenebrionidae, and Acrididae. Our findings provide a refined look at the potential invertebrate food base for RGWT and a detailed invertebrate diversity dataset for supporting a future molecular analysis (i.e., DNA metabarcoding) that will be used to compare invertebrate taxa occurrences in RGWT fecal samples to potentially relate to community data reported herein. Our findings refine what we know about dominant and/or recurring food resources for RGWT and may inform land management practices to focus on conserving sensitive riparian areas or promoting upland vegetation cover that provide refugia and additional resources for invertebrate prey. Each chapter is formatted as an independent manuscript and formatted for the Journal of Wildlife Management
Box 2, Folder 6, MGN Costumbristas y misc.
No full textThe Boyd Carter Papers represent a significant archival collection housed in the Hispanic Studies Collection in Texas Tech University's CMLL building. Dr. Boyd Carter was a distinguished scholar of Latin American literature who was active from the 1940s to his death in 1980. He held professorships at the University of Nebraska, Southern Illinois University, and the University of Missouri before concluding his career at Texas Tech University (1978-1980). Upon joining TTU, Carter donated his extensive archive to the university, including rare books, microfilm collections, bibliographical notes, and periodicals focusing on Latin American literature from 1850-1950, with particular emphasis on the famed Mexican writer Manuel Gutiérrez Nájera
Box 4, Folder 6, MGN "Meditaciones Serias" 2 of 3
No full textThe Boyd Carter Papers represent a significant archival collection housed in the Hispanic Studies Collection in Texas Tech University's CMLL building. Dr. Boyd Carter was a distinguished scholar of Latin American literature who was active from the 1940s to his death in 1980. He held professorships at the University of Nebraska, Southern Illinois University, and the University of Missouri before concluding his career at Texas Tech University (1978-1980). Upon joining TTU, Carter donated his extensive archive to the university, including rare books, microfilm collections, bibliographical notes, and periodicals focusing on Latin American literature from 1850-1950, with particular emphasis on the famed Mexican writer Manuel Gutiérrez Nájera