The Ursinus Weekly, October 28, 1971

Opera stage director to speak at Ursinus • Homecoming Day presents something for everyone • U.C. ProTheatre presents Ionesco\u27s The Lesson • Sorority pledging in full swing • Y Coffeehouse features Doo daa in basement • Editorial: Talking to teachers; On required forums • Focus: Sue Jensen • Letters to the editor • Spotlight: Chaplain M. Detterline • Critic\u27s choice: Movie, TV, and Halloween • Object d\u27art appears; Graces Library steps • Miss Snell throws a change-up • U.C. Bears triumph; Take two in row • Bears receive honorable mention in ECAC • Soccer team drops two; Bears have rough weekhttps://digitalcommons.ursinus.edu/weekly/1110/thumbnail.jp

Level Set Grids for Hybrid Manufacturing

We propose a novel hybrid model, the Level Set Grid, to facilitate parallel additive and subtractive processes in hybrid manufacturing. The Level Set Grid combines the strengths of explicit and implicit representations, offering precise modeling of evolving geometries and fast and efficient collision detection. This research focuses on integrating Level Set Grids into the additive slicing and subtractive pathing generation processes, laying the groundwork for future advancements in the parallelization of hybrid manufacturing.Mechanical Engineerin

Single Path Generation for Closed Contours via Graph Theory and Topological Hierarchy

Slicing converts a 3D object into a set of 2D polygons that are filled with multiple path types. These paths involve travels where the extruder of the machine must stop building, lift, travel to the next path, lower, and resume construction. Travels are considered wasted time as construction of the object is not occurring. Further, the start/stop point, called a seam, causes both reduced aesthetic and weaker material properties. To address these issues, an algorithmic approach was developed to compute a continuous single path from closed contours. The algorithm utilizes graph theory and a topological hierarchy to produce a single path for an individual layer. This approach can be combined with spiralization techniques to compute a single path for entire objects. The resulting objects can be constructed quicker and have improved material properties as verified via tensile testing.Mechanical Engineerin

Undergraduate student experiences in remote lab courses during the COVID-19 pandemic

The 2020&ndash;2021 academic year was a unique time for many instructors who had to adapt their courses to be conducted remotely due to the COVID-19 pandemic. This was especially challenging for physics lab courses, which usually emphasize hands-on experiments. Although many courses have now returned to in-person teaching, the possibility remains of future disasters necessitating similar remote courses. It is important to understand how undergraduate students experienced remote physics lab courses during the pandemic, including what aspects of the courses contributed to positive student outcomes. To investigate this, we surveyed over 5000 students from 24 different institutions, asking how the students engaged with their physics lab courses during the 2020&ndash;2021 academic year. Here, we describe the frequency with which the students performed various class activities, aspects of the course environment, challenges the students faced, aspects of the courses the students found enjoyable, and some student outcomes. We further study the impact of the course activities and course environment on four of the outcomes (self-reported learning of lab skills, self-reported learning of concepts, course enjoyment, and development of a sense of community). We find that students who were provided clear expectations, had enough time for their coursework, frequently worked in groups, and frequently had access to guidance from their instructors were more likely to report positive outcomes. This work demonstrates the importance of certain aspects of lab courses for several desirable outcomes in remote lab courses during a pandemic, with findings that may transfer to in-person or remote lab courses in the future. &nbsp;</p

The Ursinus Weekly, October 26, 1972

Union and Bomberger renovation progress • Twenty-four degrees presented on successful Founder\u27s Day • SFARC starts year; Discusses women\u27s rules • Powell crowned Homecoming queen • Pre-med Society cleans cobwebbed constitution • Editorials: To voters; Do unto others • Faculty portrait: Dr. Joyce Henry • Up to New York from down on the farm; or the Fine Arts class sees the Met • WRUC radio revives; Moves to T-G Gym • Dormitory decorations trophy kept for good (show) by Shreiner • Campus once again united by sorority songs, traditions • Bear eleven rips Swarthmore; Whatley\u27s warriors win 35-21 as Ursinus\u27 offense dominates • Bearettes crunch G-burg • What ever happened to Eleanor Frost Snell? • Garnet booters trip Bears • Sports buffs\u27 cornerhttps://digitalcommons.ursinus.edu/weekly/1089/thumbnail.jp

A T8.5 Brown Dwarf Member of the Xi Ursae Majoris System

The Wide-field Infrared Survey Explorer has revealed a T8.5 brown dwarf (WISE J111838.70+312537.9) that exhibits common proper motion with a solar-neighborhood (8 pc) quadruple star system - Xi Ursae Majoris. The angular separation is 8.5 arc-min, and the projected physical separation is about 4000 AU. The sub-solar metallicity and low chromospheric activity of Xi UMa A argue that the system has an age of at least 2 Gyr. The infrared luminosity and color of the brown dwarf suggests the mass of this companion ranges between 14 and 38 Jupiter masses for system ages of 2 and 8 Gyr respectively.Comment: AJ in press, 12 pages LaTeX with 6 figures. More astrometric data and a laser guide star adaptive optics image adde

Transmitting G-Code with Geometry Commands for Extrusion Additive Manufacturing

G-code refers to text-based commands used to instruct a 3D printer how to construct an object. G-code is generated to represent each toolpath during the slicing process. Each toolpath is represented as a list of points that define the trajectory of the path to be printed. Additional commands are included to define the motion velocity and extrusion rate, called the feeds and speeds. These toolpaths and commands must be generated specific to the machine, material, and calibration settings that will be used during the print. This paper outlines a new approach for the slicing and g-code creation process that eliminates the need for outputting feeds and speeds in the slicing process. Instead, the slicer outputs g-code that defines the desired bead geometry as printed. The 3D printer can then read this geometry data and calculate the necessary feeds and speeds based on internal calibration data to successfully print the object.Mechanical Engineerin

Discovery of Two Rare Rigidly Rotating Magnetosphere Stars in the APOGEE Survey

The Apache Point Observatory Galactic Evolution Experiment (APOGEE)---one of the Sloan Digital Sky Survey III programs---is using near-infrared (NIR) spectra of ~100,000 red giant branch star candidates to study the structure of the Milky Way. In the course of the survey, APOGEE also acquires spectra of hot field stars to serve as telluric calibrators for the primary science targets. We report the serendipitous discovery of two rare, fast-rotating B-stars of the sigma Ori E type among those blue field stars observed during the first year of APOGEE operations. Both of the discovered stars display the spectroscopic signatures of rigidly rotating magnetospheres (RRM) common to this class of highly magnetized (B ~ 10 kGauss) stars, increasing the number of known RRM stars by ~10%. One (HD 345439) is a main-sequence B-star with unusually strong He absorption (similar to sigma Ori E), while the other (HD 23478) fits a "He-normal" B3IV classification. We combine the APOGEE discovery spectra with other optical and NIR spectra of these two stars, and of sigma Ori E itself, to show how NIR spectroscopy can be a uniquely powerful tool for discovering more of these rare objects, which may show little/no RRM signatures in their optical spectra. We discuss the potential for further discovery of sigma Ori E type stars, as well as the implications of our discoveries for the population of these objects and insights into their origin and evolution