Note: When clicking on a Digital Object Identifier (DOI) number, you will be taken to an external site maintained by the publisher.
Some full text articles may not yet be available without a charge during the embargo (administrative interval).
What is a DOI Number?
Some links on this page may take you to non-federal websites. Their policies may differ from this site.
-
Coyle, Laura E ; Perrin, Marshall D ; Matsuura, Shuji (Ed.)Free, publicly-accessible full text available August 23, 2025
-
Coyle, Laura E ; Perrin, Marshall D ; Matsuura, Shuji (Ed.)Free, publicly-accessible full text available August 23, 2025
-
Coyle, Laura E ; Perrin, Marshall D ; Matsuura, Shuji (Ed.)Free, publicly-accessible full text available August 23, 2025
-
The search for the polarized imprint of primordial gravitational waves in the cosmic microwave background (CMB) as direct evidence of cosmic inflation requires exquisite sensitivity and control over systematics. The next-generation CMB-S4 project intends to improve upon current-generation experiments by deploying a significantly greater number of highly-sensitive detectors, combined with refined instrument components based on designs from field-proven instruments. The Precursor Small Aperture Telescope (PreSAT) is envisioned as an early step to this next generation, which will test prototype CMB-S4 components and technologies within an existing Bicep Array receiver, with the aim of enabling full-stack laboratory testing and early risk retirement, along with direct correlation of laboratory component-level performance measurements with deployed system performance. The instrument will utilize new 95/155 GHz dichroic dual-linear-polarization prototype detectors developed for CMB-S4, cooled to 100mK via the installation of an adiabatic demagnetization refrigerator, along with a prototype readout chain and prototype optics manufactured with wide-band anti-reflection coatings. The experience gained by integrating, deploying, and calibrating PreSAT will also help inform planning for CMB-S4 small aperture telescope commissioning, calibration, and operations well in advance of the fabrication of CMB-S4 production hardware.more » « lessFree, publicly-accessible full text available June 13, 2025
-
Free, publicly-accessible full text available February 1, 2025
-
Wax, Adam ; Backman, Vadim (Ed.)Free, publicly-accessible full text available March 12, 2025
-
The Nonesuch Formation microbiota provide a window into ca. 1075 Ma life within the interior of ancient North America. The Nonesuch water body formed following the cessation of widespread volcanism within the Midcontinent Rift as the basin continued to subside. In northern Michigan and Wisconsin, USA, the Copper Harbor Conglomerate records terrestrial alluvial fan and fluvial plain environments that transitioned into subaqueous lacustrine deposition of the Nonesuch Formation. These units thin toward a paleotopographic high associated with the Brownstone Falls angular unconformity. Due to these “Brownstone Highlands,” we were able to explore the paleoenvironment laterally at different depths in contemporaneous deposits. Rock magnetic data constrain that when the lake was shallow, it was oxygenated as evidenced by an oxidized mineral assemblage. Oxygen levels were lower at greater depth—in the deepest portions of the water body, anoxic conditions are recorded. An intermediate facies in depth and redox between these endmembers preserves detrital magnetite and hematite, which can be present in high abundance due to the proximal volcanic highlands. This magnetic facies enabled the development of a paleomagnetic pole based on both detrital magnetite and hematite that constrains the paleolatitude of the lake to 7.1 ± 2.8°N. Sediments of the intermediate facies preserve exquisite organic-walled microfossils, with microfossils being less diverse to absent in the anoxic facies where amorphous organic matter is more likely to be preserved. The assemblage of cyanobacteria and eukaryotes (both photoautotrophs and heterotrophs) lived within the oxygenated waters of this tropical Mesoproterozoic water body.more » « less
-
Beaurepaire, Emmanuel ; Ben-Yakar, Adela ; Park, YongKeun (Ed.)
-
Coyle, Laura E ; Perrin, Marshall D ; Matsuura, Shuji (Ed.)Free, publicly-accessible full text available August 23, 2025
-
We began this project with three goals: (1) engage families in engineering activities, (2) increase the awareness of kids and caregivers as to what engineering is, and (3) increase children’ interest in engineering. We focused on caregivers and home environments because of the important role that at-home experiences with STEM play in triggering interest for many individuals who enter STEM professions. We created and distributed four different kits to families interested in engaging in STEM activities at home. Each kit included a challenge around engineering-related content (e.g., circuits, construction) and contained activity instructions (child) and a facilitation guide (caregivers). However, few instructions were given to caregivers about the expectations of their role while engaging with their children. This paper reports on the findings from family engagement in the Watercolor Bot kit. We sought to explore the roles enacted and behaviors utilized by caregivers as they supported their children during the activity. Our findings add to the conversation about how to define and conceptualize caregiver roles and how the home context/setting influences the types of supports caregivers provide. In contrast to emerging work on caregiver support, we argue that it may be more fruitful to think about the types of support (physical, verbal, content, and managerial) offered rather than defining specific roles (e.g., collaborator, project manager, etc.). We provide implications for designing kits and activities to include specific support for caregivers beyond simply providing project-specific instructions that address caregivers’ needs.more » « less