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The Student Pathways in Engineering and Computing for Transfers (SPECTRA) program is a newly funded S-STEM program in South Carolina, expected to run through 2026. The program is envisioned to provide a streamlined academic pathway for transfer students from 2-year programs within South Carolina into Clemson University, and provide programming to aid their academic success and social integration. To achieve this, SPECTRA will create cohorts of students at two community/technical colleges (Spartanburg Community College and Trident Technical College) and then support that cohort as they transitioned together into Clemson University. This cohort would then be mentored in how to navigate Clemson University’s academic environment, utilizing available programming such as academic tutoring, field trips to see local engineering companies, etc. A unique component of the SPECTRA program is the requirement that scholarship recipients at Clemson University enroll in two semesters of research, in addition to their participation in social and academic programing. Through this Work in Progress paper, the experience in designing and facilitating these research courses while matriculating through their graduate programs is documented by the authors. Specifically, the design constraints of the research courses, the topics developed for the 2021-2022 cohorts and the envisioned assessment are discussed. 

In this work-in-progress paper we present emergent recruitment issues encountered during an ongoing design-based project with participants from two-year colleges for an NSF-funded scholarship program. Our hope is to connect with researchers who have previously explored similar issues or may be experiencing them in their current work. Student Pathways in Engineering and Computing for Transfer Students (SPECTRA) is an NSF S-STEM program that provides financial assistance to students transferring from the South Carolina Technical College System into Engineering or Computing majors at Clemson University [1]. SPECTRA also assists students by connecting them with peers at the technical colleges who move together through the transfer process to Clemson and are supported by the SPECTRA program until graduation. In addition to exploring the experiences of current SPECTRA participants, we investigate how the project can be scaled to include more students and sustained after NSF support ends. The 2021-2022 academic year is the third of the five-year program, although, given emergent recruitment issues, we foresee application for a no-cost extension. The primary concern is the low number of students currently supported in comparison to our goals, highlighting recruitment for further examination. We planned to support up to twenty students in year 1, 52 students in year 2, 70 students in year 3, but our actual numbers in the first three years are 7, 12, and 28 students. Given this trend, our concern over how we recruit students into SPECTRA is now at the forefront of our work. The program is not reaching those students who are eligible, and low recruitment has limited the quality of research needed to inform the construction of a sustainable program. To explore recruitment, we have added interviews with potential students at the technical colleges. In addition to this interview process, we have reviewed our internal practices, analysed existing public information and social media from similar programs, and reviewed existing literature from related research and practice. We identified aspects that may have impacted our current situation. The first was explicit, being the impact of COVID-19 on our ability to hold in-person recruitment events. Similar to studies that have identified other COVID-19 impacts to two-year institutions such as “retention rates declined the most in the community college sector (-2.1 pp to 51.6%)” [2], “disparities in upward transfer mobility increased during the pandemic year” [3], and community colleges being hit hardest “with a 9.4 percent decline” in enrollment [4], we intend to further clarify the influence of COVID-19 on our context. COVID-19 also played a role with regard to the need for scholarship funds, as one of the technical colleges in our program used federal relief funds to provide free tuition for all students during the 2020-2021 academic year. Another potential impact is the effectiveness of the SPECTRA webpages and other online materials to meet the needs of potential students considering the program. In this work-in-progress paper, we will share how we are addressing recruitment issues and how new interventions are impacting recruitment. 

The Student Pathways in Engineering and Computing for Transfers (SPECTRA) program is anticipated to provide a streamlined academic pathway for transfer students from 2-year programs within South Carolina into Clemson University, and deliver programming to aid their academic success and social integration. To achieve this, the faculty intended to solidify cohorts of students at two community/technical colleges (Spartanburg Community College and Trident Technical College) and then support that cohort as they transitioned together into Clemson University. This paper provides an overview of the larger SPECTRA program and a deeper dive into the role of the graduate teaching assistants (‘fellows’). Specifically, we will provide an overview of: (1) changes between initial program vision and adjustments from this vision during initial implementation, (2) recruitment processes and application requirements for the graduate teaching fellowship, (3) the framework for development of undergraduate research courses taught by fellows, (4) mentorship web for fellows on the research university campus and technical/community college locations, (5) the lessons learned from semi structured programmatic exit interviews of matriculated fellows, and (6) design for additional professional programming for scholars at the community/technical college locations by the fellows. 

ABSTRACT Spider pulsars continue to provide promising candidates for neutron star mass measurements. Here we present the discovery of PSR J1910−5320, a new millisecond pulsar discovered in a MeerKAT observation of an unidentified Fermi-LAT gamma-ray source. This pulsar is coincident with a recently identified candidate redback binary, independently discovered through its periodic optical flux and radial velocity. New multicolour optical light curves obtained with ULTRACAM/New Technology Telescope in combination with MeerKAT timing and updated SOAR/Goodman spectroscopic radial velocity measurements allow a mass constraint for PSR J1910−5320. icarus optical light curve modelling, with streamlined radial velocity fitting, constrains the orbital inclination and companion velocity, unlocking the binary mass function given the precise radio ephemeris. Our modelling aims to unite the photometric and spectroscopic measurements available by fitting each simultaneously to the same underlying physical model, ensuring self-consistency. This targets centre-of-light radial velocity corrections necessitated by the irradiation endemic to spider systems. Depending on the gravity darkening prescription used, we find a moderate neutron star mass of either 1.6 ± 0.2 or 1.4 ± 0.2 M⊙. The companion mass of either 0.45 ± 0.04 or $$0.43^{+0.04}_{-0.03}$$M⊙ also further confirms PSR J1910−5320 as an irradiated redback spider pulsar. 

Abstract Reliable neutron star mass measurements are key to determining the equation of state of cold nuclear matter, but such measurements are rare. Black widows and redbacks are compact binaries consisting of millisecond pulsars and semi-degenerate companion stars. Spectroscopy of the optically bright companions can determine their radial velocities, providing inclination-dependent pulsar mass estimates. Although inclinations can be inferred from subtle features in optical light curves, such estimates may be systematically biased due to incomplete heating models and poorly understood variability. Using data from the Fermi Large Area Telescope, we have searched for gamma-ray eclipses from 49 spider systems, discovering significant eclipses in 7 systems, including the prototypical black widow PSR B1957+20. Gamma-ray eclipses require direct occultation of the pulsar by the companion, and so the detection, or significant exclusion, of a gamma-ray eclipse strictly limits the binary inclination angle, providing new robust, model-independent pulsar mass constraints. For PSR B1957+20, the eclipse implies a much lighter pulsar (1.81 ± 0.07 solar masses) than inferred from optical light curve modelling. 

The stiff-stalk heterotic group in Maize (Zea mays L.) is an important source of inbreds used in U.S. commercial hybrid production. Founder inbreds B14, B37, B73, and, to a lesser extent, B84, are found in the pedigrees of a majority of commercial seed parent inbred lines. We created high-quality genome assemblies of B84 and four expired Plant Variety Protection (ex-PVP) lines LH145 representing B14, NKH8431 of mixed descent, PHB47 representing B37, and PHJ40, which is a Pioneer Hi-Bred International (PHI) early stiff-stalk type. Sequence was generated using long-read sequencing achieving highly contiguous assemblies of 2.13–2.18 Gbp with N50 scaffold lengths >200 Mbp. Inbred-specific gene annotations were generated using a core five-tissue gene expression atlas, whereas transposable element (TE) annotation was conducted using de novo and homology-directed methodologies. Compared with the reference inbred B73, synteny analyses revealed extensive collinearity across the five stiff-stalk genomes, although unique components of the maize pangenome were detected. Comparison of this set of stiff-stalk inbreds with the original Iowa Stiff Stalk Synthetic breeding population revealed that these inbreds represent only a proportion of variation in the original stiff-stalk pool and there are highly conserved haplotypes in released public and ex-Plant Variety Protection inbreds. Despite the reduction in variation from the original stiff-stalk population, substantial genetic and genomic variation was identified supporting the potential for continued breeding success in this pool. The assemblies described here represent stiff-stalk inbreds that have historical and commercial relevance and provide further insight into the emerging maize pangenome. 

ABSTRACT The Fermi Large Area Telescope gamma-ray source 3FGL J2039.6–5618 contains a periodic optical and X-ray source that was predicted to be a ‘redback’ millisecond pulsar (MSP) binary system. However, the conclusive identification required the detection of pulsations from the putative MSP. To better constrain the orbital parameters for a directed search for gamma-ray pulsations, we obtained new optical light curves in 2017 and 2018, which revealed long-term variability from the companion star. The resulting orbital parameter constraints were used to perform a targeted gamma-ray pulsation search using the Einstein@Home-distributed volunteer computing system. This search discovered pulsations with a period of 2.65 ms, confirming the source as a binary MSP now known as PSR J2039–5617. Optical light-curve modelling is complicated, and likely biased, by asymmetric heating on the companion star and long-term variability, but we find an inclination i ≳ 60°, for a low pulsar mass between $$1.1\, \mathrm{M}_{\odot } \lt M_{\rm psr} \lt $$ 1.6 M⊙, and a companion mass of 0.15–$$0.22\, \mathrm{M}_{\odot }$$, confirming the redback classification. Timing the gamma-ray pulsations also revealed significant variability in the orbital period, which we find to be consistent with quadrupole moment variations in the companion star, suggestive of convective activity. We also find that the pulsed flux is modulated at the orbital period, potentially due to inverse Compton scattering between high-energy leptons in the pulsar wind and the companion star’s optical photon field.