Cavitation in liquid cryogens

Cavitation in liquid hydrogen and nitrogen flowing in transparent plastic ventur

Incipient and developed cavitation in liquid cryogens

Cavitational flow of liquid nitrogen and liquid hydrogen in Venturi tub

SU(N) Wigner-Racah algebra for the matrix of second moments of embedded Gaussian unitary ensemble of random matrices

Recently Pluhar and Weidenmueller [Ann. Phys. (N.Y.) Vol 297, 344 (2002)] showed that the eigenvectors of the matrix of second moments of embedded Gaussian unitary ensemble of random matrices generated by k-body interactions (EGUE(k)) for m fermions in N single particle states are SU(N) Wigner coefficients and derived also an expression for the eigenvalues. Going beyond this work, we will show that the eigenvalues of this matrix are square of a SU(N) Racah coefficient and thus the matrix of second moments of EGUE(k) is solved completely by SU(N) Wigner-Racah algebra.Comment: 16 page

Comparison of mass limiting two-phase flow in a straight tube and in a nozzle

Mass-limiting and near mass-limiting two-phase flow in straight tube and nozzle of refrigerant flow loop syste

Thermodynamic depressions within cavities and cavitation inception in liquid hydrogen and liquid nitrogen Final report, 15 Jul. 1964 - 15 Dec. 1967

Thermodynamic depressions within cavities and cavitation inception in liquid hydrogen and nitrogen in transparent plastic venturi tube

Cavitation inception in liquid nitrogen and liquid hydrogen flowing in a venturi Interim report, 15 Jul. 1964 - 15 Jul. 1967

Cavitation characteristics of liquid hydrogen, and liquid nitrogen flow in plastic ventur

The Reincorporation of Prisoners into the Body Politic: Eliminating the Medicaid Inmate Exclusion Policy

Incarcerated people are excluded from Medicaid coverage due to a provision in the Social Security Act Amendments of 1965 known as the Medicaid Inmate Exclusion Policy (“MIEP”). This Article argues for the elimination of the MIEP as an anachronistic remnant of an earlier era prior to the massive growth of the U.S. incarcerated population and the expansion of Medicaid eligibility under the Patient Protection and Affordable Care Act of 2010. It explores three reasons for eliminating the MIEP. First, the inclusion of incarcerated populations in Medicaid coverage would signify the final erasure from the Medicaid regime of the istinction between the “deserving” and “undeserving” poor and is consistent with and in furtherance of the ACA’s ultimate goal of universal health insurance coverage. Second, elimination of the MIEP furthers the bipartisan criminal legal system reform focus on reducing recidivism through effective reentry. Current efforts to use Medicaid to facilitate reentry require careful workarounds of the MIEP. Elimination of the policy would reduce logistical hurdles to ensuring continuity of care and enhance rehabilitation services provided during incarceration. Third, eliminating the MIEP coalesces with the goals of the emerging discourse around health justice, and specifically, its focus on how social determinants of health drive inequities. In including a health justice framework, this Article seeks to enrich the discussion in two directions. In the first instance, health justice illuminates structural factors such as discrimination and poverty that are root causes of health inequities and must be addressed alongside immediate health needs. At the same time, this Article aims to deepen the health justice discussion with a sharper focus on the role of incarceration in perpetuating health inequities, and the ways in which extending Medicaid access to incarcerated populations can improve treatment of immediate needs while also addressing structural inequities that cause and are caused by justice system involvement

Influence of Student Characteristics, Class Size, and Instructor Characteristics in Online Student Success

The purpose of this non-experimental quantitative case study was to compare the academic success of community college students over three academic years (2016-17 through 2018-19) before the onset of COVID-19 based on final grades and the influence of student factors, class size, and faculty characteristics using archival data from selected online and on-ground classes at a Middle Tennessee community college. Student factors reviewed include gender, full-time or part-time status, and age (traditional or non-traditional status). Instructor characteristics reviewed included full-time or part-time (adjunct) teaching status and tenure or non-tenure status of faculty. Institutional data for this study consisted of 44,568 student records comprising 34,006 on-ground classes and 10,562 online classes. For the percentages provided, audit and incomplete or missing data were excluded. In this study, the mean grade point average (GPA) of all students with prior GPAs was 2.7. Unique student registrations totaled 13,400 students and unique instructors totaled 198. Eight research questions were answered from these data using Chi-square statistical tests. The final study showed a variety of results. When comparing student success for online and on-ground, online students were generally more likely to be successful, while on-ground students were generally more likely to be unsuccessful. In online courses, female students, part-time students, and non-traditional students were more likely to be successful. Class sizes fewer than 11 were generally more likely to produce successful students. Successful students were generally more likely to be taught by full-time faculty and tenured faculty

Hypergraphic LP Relaxations for Steiner Trees

We investigate hypergraphic LP relaxations for the Steiner tree problem, primarily the partition LP relaxation introduced by Koenemann et al. [Math. Programming, 2009]. Specifically, we are interested in proving upper bounds on the integrality gap of this LP, and studying its relation to other linear relaxations. Our results are the following. Structural results: We extend the technique of uncrossing, usually applied to families of sets, to families of partitions. As a consequence we show that any basic feasible solution to the partition LP formulation has sparse support. Although the number of variables could be exponential, the number of positive variables is at most the number of terminals. Relations with other relaxations: We show the equivalence of the partition LP relaxation with other known hypergraphic relaxations. We also show that these hypergraphic relaxations are equivalent to the well studied bidirected cut relaxation, if the instance is quasibipartite. Integrality gap upper bounds: We show an upper bound of sqrt(3) ~ 1.729 on the integrality gap of these hypergraph relaxations in general graphs. In the special case of uniformly quasibipartite instances, we show an improved upper bound of 73/60 ~ 1.216. By our equivalence theorem, the latter result implies an improved upper bound for the bidirected cut relaxation as well.Comment: Revised full version; a shorter version will appear at IPCO 2010