cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On permutation-twisted free fermions and two conjectures
Creators: name: Barron, Katrina
name: Werf, Nathan Vander
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Algebra (math.QA)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 17B68, 17B69, 17B81, 81R10, 81T40, 81T60

description: We conjecture that the category of permutation-twisted modules for a multi-fold tensor product vertex operator superalgebra and a cyclic permutation of even order is isomorphic to the category of parity-twisted modules for the underlying vertex operator superalgebra. This conjecture is based on our observations of the cyclic permutation-twisted modules for free fermions as we discuss in this work, as well as previous work of the first author constructing and classifying permutation-twisted modules for tensor product vertex operator superalgebras and a permutation of odd order. In addition, we observe that the transposition isomorphism for two free fermions corresponds to a lift of the -1 isometry of the integral lattice vertex operator superalgebra corresponding to two free fermions under boson-fermion correspondence. We conjecture that all even order cyclic permutation automorphisms of free fermions can be realized as lifts of lattice isometries under boson-fermion correspondence. We discuss the role of parity stability in the construction of these twisted modules and prove that in general, parity-unstable weak twisted modules for a vertex operator superalgebras come in pairs that form orthogonal invariant subspaces of parity-stable weak twisted modules, clarifying their role in many other settings.
Automatic Differentiation for the Direct Minimization Approach to the Hartree-Fock Method
Creators: name: Yoshikawa, Naruki
name: Sumita, Masato
Publisher: name: arXiv
Year: 2022
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Automatic differentiation has become an important tool for optimization problems in computational science, and it has been applied to the Hartree-Fock method. Although the reverse-mode automatic differentiation is more efficient than the forward-mode, eigenvalue calculation in the self-consistent field method has impeded the use of the reverse-mode automatic differentiation. Here, we propose a method to directly minimize Hartree-Fock energy under the orthonormality constraint of the molecular orbitals using reverse-mode automatic differentiation by avoiding eigenvalue calculation. According to our validation, the proposed method was more stable than the conventional self-consistent field method and achieved comparable accuracy.
Novel magnetism of Ir5+ ions in the double perovskite Sr2YIrO6
Creators: name: Cao, G.
name: Qi, T. F.
name: Li, L.
name: Terzic, J.
name: Yuan, S. J.
name: DeLong, L. E.
name: Murthy, G.
name: Kaul, R. K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We synthesize and study single crystals of a new double-perovskite Sr2YIrO6. Despite two strongly unfavorable conditions for magnetic order, namely, pentavalent Ir5+(5d4) ions which are anticipated to have Jeff=0 singlet ground states in the strong spin-orbit coupling (SOC) limit, and geometric frustration in a face centered cubic structure formed by the Ir5+ ions, we observe this iridate to undergo a novel magnetic transition at temperatures below 1.3 K. We provide compelling experimental and theoretical evidence that the origin of magnetism is in an unusual interplay between strong non-cubic crystal fields and intermediate-strength SOC. Sr2YIrO6 provides a rare example of the failed dominance of SOC in the iridates.
description: Four Figures
To move or not to move: place attachment, Arcticness & migration in Siberia
Creators: name: Doloisio, Natalia
Publisher: name: Zenodo
Year: 2019
Subjects: migrations
Siberia
climate change
permafrost
yakutia

description: Oral presentation at the Seminar “Issues and dynamics of internal migrations in a changing world”, 18th December, 2019, at the OVSQ Research Laboratory, France.
title: Carmen in faustissimum coniugii vigesimum quintum et imperii decimum annum Augustissimi Bavariae Regis Ludovici I; 1835
title: Jubellied auf die erhabene Feier der fünfundzwanzigjährigen Ehe und zehnjährigen Regierung Sr. Königl. Majestät von Bayern Ludwigs I.
titleType: Subtitle
Creators: name: Schmid, Alexander
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2007

description: Text lat. und dt.
Multiple Missions of Community Colleges: Conflicting or Complementary?
Creators: name: Bailey, Thomas R.
name: Averianova, Irina E.
Publisher: name: Columbia University
Year: 2000
Subjects: Community college students--Education
Community colleges

description: From their beginnings in the early 1900s, community colleges have undergone a significant shift in their purpose and mission. Starting primarily as junior colleges with an emphasis on academics, the colleges  are now complex institutions taking on a broad array of educational, social, and economic functions. Many community college advocates hail the comprehensiveness of these institutions, arguing that the ever-expanding mission meets a commitment to serve the changing needs of the community. But critics suggest that the colleges have abandoned missions that should form the foundation of a democratic society and have squandered effort and resources in an attempt to “be all things to all people.” Advocates of both sides of this controversy have compelling arguments. On the one hand, it seems logical that excellence can best be achieved with a precise focus and a clear sense of mission. Yet community colleges have strengths and resources that give them advantages in providing many of the functions that they have taken on. And in many cases, the colleges can use strengths and skills built up in one function to build a solid foundation for new activities. We do not try to resolve this controversy. Rather, we have two objectives. Our first is to clarify some of the underlying assumptions and move us closer to a concrete analysis of the optimal set of missions for the colleges. Despite the passionate and long-standing controversy, little of the discussion is based on concrete evidence of the benefits or costs of combining missions and activities; most conclusions are based on logical arguments and inferences, rather than empirical data and information. Our second objective is to report preliminary findings from a national study of the missions of community colleges. This project involves intensive fieldwork in ten community colleges and five public, regional universities, in five states. The project is designed to explore the extent to which the different functions and missions in the colleges are actually integrated or come into conflict.
Challenges and opportunities for applications of unconventional superconductors
Creators: name: Gurevich, Alex
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Since the discovery of high-$T_c$ cuprates the quest for new superconductors has shifted toward more anisotropic, strongly correlated materials with lower carrier densities and competing magnetic and charge density wave orders. While these materials features enhance superconducting correlations, they also result in serious problems for applications at liquid nitrogen (and higher) temperatures and strong magnetic fields, so that such conventional characteristics as the critical temperature $T_c$ and the upper critical field $H_{c2}$ are no longer the main parameters of merit. This happens because of strong fluctuations of the order parameter, thermally-activated hopping of pinned vortices and electromagnetic granularity, as has been established after extensive investigations of cuprates and Fe-based superconductors. In this paper I give an overview of these mechanisms crucial for power and magnet applications and discuss the materials restrictions which have to be satisfied in order to make superconductors useful at high temperatures and magnetic fields. These restrictions become more and more essential at higher temperatures and magnetic fields, particularly for the yet-to-be-discovered superconductors operating at room temperatures. In this case the performance of superconductors will be limited by destructive fluctuations of the order parameter so higher superfluid density and weaker electronic anisotropy which reduce these fluctuations can become far more important than higher $T_c$.
description: Submitted to Annual Reviews of Condensed Matter Physics
D1.2 Data Management Plan Update
Creators: name: Jessica Snoek
Publisher: name: Zenodo
Year: 2023

description: This deliverable describes the data management life cycle for the data to be collected processed and generated during the VitiGEOSS project. The purpose is to establish how the data will be created, stored and backed-up, who owns it and who is responsible for the different data and which data will be preserved and shared. It will cover, the handling of research data during and after the project, what data will be collected, processed, or generated, what methodology and standards will be applied, whether data will be shared/made open and how and how data will be curated and preserved. The Data Management Plan will be used as a standard data guideline for the project consortium to ensure interoperability and sharing for public data generated by the project. Each project partner should respect the policies set out in the resulting Data Management Plan. 
Datasets have to be created, managed and stored appropriately and in line with European Commission and local legislation. Dataset validation and registration of metadata and backing up data for sharing through repositories is the responsibility of the partner that generates the data. The datasets in the repository project will be preserved in line with the European Commission Data Deposit Policy
description: The VitiGEOSS project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No. 869565
Solid Waste Management Systems in the Rural Southeast
Creators: name: Russell, Jesse R.
name: Russell, Jesse R.
Publisher: name: Unknown
Year: 1976
Subjects: subject: Community/Rural/Urban Development
subject: Environmental Economics and Policy
subject: Labor and Human Capital
subject: Public Economics
subject: Solid waste management
subject: Costs
subject: Revenues
subject: Southeast United States

description: Part of an overall study of rural solid waste systems in the Southeastern United States, this report identifies and describes types and costs of 63 collection and 40 disposal systems used in rural communities and areas. Costs exceeded revenues in each case. Consolidation of small systems into larger, area-wide systems could generate more efficient, less costly operations. A later report will describe alternative systems best suited to small towns of various sizes, provide estimates on the amounts of solid waste to be generated in future years, and systems changes needed to handle this increased load.
The VIMOS Public Extragalactic Redshift Survey (VIPERS): A quiescent formation of massive red-sequence galaxies over the past 9 Gyr
Creators: name: Fritz, A.
name: Scodeggio, M.
name: Ilbert, O.
name: Bolzonella, M.
name: Davidzon, I.
name: Coupon, J.
name: Garilli, B.
name: Guzzo, L.
name: Zamorani, G.
name: Abbas, U.
name: Adami, C.
name: Arnouts, S.
name: Bel, J.
name: Bottini, D.
name: Branchini, E.
name: Cappi, A.
name: Cucciati, O.
name: De Lucia, G.
name: de la Torre, S.
name: Franzetti, P.
name: Fumana, M.
name: Granett, B. R.
name: Iovino, A.
name: Krywult, J.
name: Brun, V. Le
name: Fèvre, O. Le
name: Maccagni, D.
name: Małek, K.
name: Marulli, F.
name: McCracken, H. J.
name: Paioro, L.
name: Polletta, M.
name: Pollo, A.
name: Schlagenhaufer, H.
name: Tasca, L. A. M.
name: Tojeiro, R.
name: Vergani, D.
name: Zanichelli, A.
name: Burden, A.
name: Di Porto, C.
name: Marchetti, A.
name: Marinoni, C.
name: Mellier, Y.
name: Moscardini, L.
name: Nichol, R. C.
name: Peacock, J. A.
name: Percival, W. J.
name: Phleps, S.
name: Wolk, M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We explore the evolution of the Colour-Magnitude Relation (CMR) and Luminosity Function (LF) at 0.410^11 M_sun) and expeditious RS formation over a short period of ~1.5 Gyr starting before z=1. This is supported by the detection of ongoing SF in ETGs at 0.9
description: 27 pages, 21 figures, accepted for publication in A&A
Two-color pump-probe dynamics of transitions between doubly excited states of Helium
Creators: name: Themelis, Spyros I.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We discuss the dynamics of the two-photon resonant ionization of helium involving two autoionizing states in the presence of two-color laser fields. The first source is tuned around the transition from the ground state to the 2s2p 1Po autoionizing state, and the second couples the state 2s2p 1Po to the 2p2 1S autoionizing state. The laser coupling between the doubly excited states is shown to lead to modifications of the Beutler-Fano profile and the appearance of an Autler-Townes doublet. This double resonance effect between autoionizing states can be observed at moderate laser intensities easily attainable by currently operated sources.
description: 10 pages, 5 figures
Promoting College Access and Success: A Review of Credit-Based Transition Programs
Creators: name: Bailey, Thomas R.
name: Karp, Melinda Jane Mechur
Publisher: name: Columbia University
Year: 2003
Subjects: Community college students--Education
Community colleges

description: Many argue that the disconnection between the K-12 and postsecondary systems is a fundamental cause of the seeming inability of high schools to prepare many students for college. One approach to facilitating the transition to college, which has grown dramatically in the last decade, is to allow high school students to take college courses and to earn college credit while still in high school. We refer to these programs as credit-based transition programs. Traditionally used to accelerate the progress of high-achieving college-bound youth, they have gained attention recently as a way to facilitate college access and success for middle-and even lower-performing students. This paper seeks to answer some of the many questions that exist about credit-based transition programs. The authors reviewed 45 published and unpublished reports,articles, and books on the most common credit-based transition programs -- dual enrollment, Advanced Placement, International Baccalaureate (IB), TechPrep, and middle college high schools -- to examine the programs and their characteristics, and to review what is known about their ability to increase college success for students.
The stellar mass function, binary content and radial structure of the open cluster Praesepe derived from PPMXL and SDSS data
Creators: name: Khalaj, Pouria
name: Baumgardt, Holger
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We have determined possible cluster members of the nearby open cluster Praesepe (M44) based on J and K photometry and proper motions from the PPMXL catalogue and z photometry from the Sloan Digital Sky Survey (SDSS). In total we identified 893 possible cluster members down to a magnitude of J = 15.5 mag, corresponding to a mass of about 0.15 Msun for an assumed cluster distance modulus of (m-M)_0 = 6.30 mag (d ~ 182 pc), within a radius of 3.5° around the cluster centre. We derive a new cluster centre for Praesepe (α_centre = 8h 39m 37s, δ_centre = 19° 35' 02"). We also derive a total cluster mass of about 630 Msun and a 2D half-number and half-mass radius of 4.25 pc and 3.90 pc respectively. The global mass function (MF) of the cluster members shows evidence for a turnover around m = 0.65 Msun. While more massive stars can be fit by a power-law ξ(m) ~ m^(-α) with slope α = 2.88 +/- 0.22, stars less massive than m = 0.65 Msun are best fitted with α = 0.85 +/- 0.10. In agreement with its large dynamical age, we find that Praesepe is strongly mass segregated and that the mass function slope for high mass stars steepens from a value of α = 2.32 +/- 0.24 inside the half-mass radius to α = 4.90 +/- 0.51 outside the half-mass radius. We finally identify a significant population of binaries and triples in the colour-magnitude diagram of Praesepe. Assuming non-random pairing of the binary components, a binary fraction of about 35% for primaries in the mass range 0.6 < m/Msun < 2.20 is required to explain the observed number of binaries in the colour-magnitude diagram (CMD).
description: 11 pages, 10 figures. Accepted for publication in MNRAS
State Dual Enrollment Policies: Addressing Access and Quality
Creators: name: Karp, Melinda Jane Mechur
name: Bailey, Thomas R.
name: Hughes, Katherine Lee
name: Fermin, Baranda J.
Publisher: name: Columbia University
Year: 2004
Subjects: Community college students--Education
Community colleges

description: This study provides an overview of current state activity related to dual enrollment and an analysis of the implications of various policy mechanisms on student participation and program growth. CCRC's analysis was particularly concerned with the balance between the need to maintain the academic rigor of dual enrollment programs and the desire to expand access to these programs beyond the most academically advanced students. The report emphasizes the many choices inherent in creating policies for programs that have multiple goals and include institutions from a variety of education sectors. The report concludes with recommendations to policymakers.
Occultation of the T Tauri Star RW Aurigae A by its Tidally Disrupted Disk
Creators: name: Rodriguez, Joseph E.
name: Pepper, Joshua
name: Stassun, Keivan G.
name: Siverd, Robert J.
name: Cargile, Phillip
name: Beatty, Thomas G.
name: Gaudi, B. Scott
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: RW Aur A is a classical T Tauri star, believed to have undergone a reconfiguration of its circumstellar environment as a consequence of a recent fly-by of its stellar companion, RW Aur B. This interaction stripped away part of the circumstellar disk of RW Aur A, leaving a tidally disrupted arm and a short truncated circumstellar disk. We present photometric observations of the RW Aur system from the Kilodegree Extremely Little Telescope (KELT) survey showing a long and deep dimming that occurred from September 2010 until March 2011. The dimming has a depth of ~2 magnitudes, a duration of ~180 days and was confirmed by archival observations from American Association of Variable Star Observers (AAVSO). We suggest that this event is the result of a portion of the tidally disrupted disk occulting RW Aur A, specifically a fragment of the tidally disrupted arm. The calculated transverse linear velocity of the occulter is in excellent agreement with the measured relative radial velocity of the tidally disrupted arm. Using simple kinematic and geometric arguments, we show that the occulter cannot be a feature of the RW Aur A circumstellar disk, and we consider and discount other hypotheses. We also place constraints on the thickness and semi-major axis of the portion of the arm that occulted the star.
description: 15 pages, 5 figures, 1 Table, Accepted by AJ
Optimal Hardy-Sobolev Inequalities on Compact Riemannain Manifolds
Creators: name: Jaber, Hassan
Publisher: name: arXiv
Year: 2014
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: Given a compact Riemannian Manifold (M,g) of dimension n > 2, a point x_0 in M and s in (0,2). We let 2*(s) = 2(n-s)/(n-2) be the critical Hardy-Sobolev exponent. The Hardy-Sobolev embedding yields the existence of A,B > 0 such that (\int_M|u|^{2*(s)}dv_g)^{2/2*(s)} \leq A\int_M |\nabla u|_g^2 dv_g +B\int_M u^2 dv_g for all u in H_1^2(M). It has been proved that A\leq K(n,s) and that one can take any value A > K(n,s) in in the above inequality where $K(n,s)$ is the best possible constant in the Euclidean Hardy-Sobolev inequality. In the present manuscript, we prove that one can also take A = K(n,s) in the above inequality.
Achieving the Dream Colleges in Pennsylvania and Washington State: Early Progress Toward Building a Culture of Evidence
Creators: name: Jenkins, Paul Davis
name: Ellwein, Todd
name: Wachen, John
name: Kerrigan, Monica Reid
name: Cho, Sung-Woo
Publisher: name: Columbia University
Year: 2009
Subjects: Community college students--Education
Community colleges

description: In 2003, Lumina Foundation for Education launched a bold, multiyear, national initiative called Achieving the Dream: Community Colleges Count, to help students stay in school and succeed. The initiative is focused particularly on students who have faced the most barriers to success, including low-income students and students of color. Initially, 27 colleges in five states joined the initiative; there are now over 80 institutions in 15 states. Participating colleges commit to using data to improve programs and services in ways that lead to increased student success — a process known as “building a culture of evidence.” Specifically, colleges mine transcripts and gather other information to understand how students are faring over time and which groups need the most assistance. Based on a diagnosis of the problems in student achievement, they design and implement strategies to improve academic outcomes. Participating colleges receive a $50,000 planning grant followed by a four-year $400,000 implementation grant, along with assistance from coaches hired by the initiative. This report describes the progress made by the 13 Pennsylvania and Washington State community colleges that comprise Round 3 of the Achieving the Dream initiative after planning and one year of implementation. The findings from this study will be compared with follow-up research that CCRC and MDRC will conduct in two years to evaluate the progress of the colleges at the end of the five-year project period.
DA white dwarfs observed in LAMOST pilot survey
Creators: name: Zhang, Yue-Yang
name: Deng, Li-Cai
name: Liu, Chao
name: Lépine, Sebastien
name: Newberg, Heidi Jo
name: Carlin, Jeffrey L.
name: Carrell, Kenneth
name: Yang, Fan
name: Gao, Shuang
name: Xu, Yan
name: Li, Jing
name: Zhang, Hao-Tong
name: Zhao, Yong-Heng
name: Luo, A-Li
name: Bai, Zhong-Rui
name: Yuan, Hai-Long
name: Jin, Ge
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: A total of $\sim640,000$ objects from LAMOST pilot survey have been publicly released. In this work, we present a catalog of DA white dwarfs from the entire pilot survey. We outline a new algorithm for the selection of white dwarfs by fitting Sérsic profiles to the Balmer H$β$, H$γ$ and H$δ$ lines of the spectra, and calculating the equivalent width of the CaII K line. 2964 candidates are selected by constraining the fitting parameters and the equivalent width of CaII K line. All the spectra of candidates are visually inspected. We identify 230 (59 of them are already in Villanova and SDSS WD catalog) DA white dwarfs, 20 of which are DA white dwarfs with non-degenerate companions. In addition, 128 candidates are classified as DA white dwarf/subdwarfs, which means the classifications are ambiguous. The result is consistent with the expected DA white dwarf number estimated based on the LEGUE target selection algorithm.
description: 44 pages, 18 figures
Quantum Vacuum Instability of 'Eternal' de Sitter Space
Creators: name: Anderson, Paul R.
name: Mottola, Emil
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The Euclidean or Bunch-Davies O(4,1) invariant 'vacuum' state of quantum fields in global de Sitter space is shown to be unstable to small perturbations, even for a massive free field with no self-interactions. There are perturbations of this state with arbitrarily small energy density at early times that is exponentially blueshifted in the contracting phase of 'eternal' de Sitter space, and becomes large enough to disturb the classical geometry through the semiclassical Einstein eqs. at later times. In the closely analogous case of a constant, uniform electric field, a time symmetric state equivalent to the de Sitter invariant one is constructed, which is also not a stable vacuum state under perturbations. The role of a quantum anomaly in the growth of perturbations and symmetry breaking is emphasized in both cases. In de Sitter space, the same results are obtained either directly from the renormalized stress tensor of a massive scalar field, or for massless conformal fields of any spin, more directly from the effective action and stress tensor associated with the conformal trace anomaly. The anomaly stress tensor shows that states invariant under the O(4) subgroup of the de Sitter group are also unstable to perturbations of lower spatial symmetry, implying that both the O(4,1) isometry group and its O(4) subgroup are broken by quantum fluctuations. Consequences of this result for cosmology and the problem of vacuum energy are discussed.
description: 47 pages, 11 figures
Broadening the Benefits of Dual Enrollment
Creators: name: Hughes, Katherine Lee
name: Rodríguez, Olga
name: Edwards, Linsey
name: Belfield, Clive
Publisher: name: Columbia University
Year: 2012
Subjects: Community college students--Education
Community colleges

description: A three-year study tracking outcomes for thousands of students across California shows that career focused dual enrollment programs can provide important benefits for those who are underachieving and underrepresented in higher education. Programs of this type, which allow high school students to take college courses and earn college credit, were once offered almost exclusively to high-achieving students seeking greater academic challenge. The Concurrent Courses initiative was launched in 2008 and began to provide support to eight secondary-postsecondary partnerships in California to develop, enhance and expand dual enrollment programs with a career focus to engage students in relevant learning. Very soon after, new programs were providing structured early college experiences — college credit courses on the college or high school campus — to students who had not had them before. At the same time, existing programs expanded their offerings and were purposefully tailoring them to students underrepresented in higher education. In all, 10 colleges and 21 high schools participated in the initiative, which ultimately touched thousands of students. Among student participants, 60 percent were students of color and 40 percent came from non-English speaking homes. The James Irvine Foundation funded the Concurrent Courses initiative to advance the goal of its Youth program: to increase the number of low-income youth in California who complete high school on time and attain a postsecondary credential by age 25.
Computation of the unipotent radical of the differential Galois group for a parameterized second-order linear differential equation
Creators: name: Arreche, Carlos E.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Commutative Algebra (math.AC)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: Primary 12H20 34M15, Secondary 34M03, 20H20, 13N10, 33F10, 37K20

description: We propose a new method to compute the unipotent radical $R_u(H)$ of the differential Galois group $H$ associated to a parameterized second-order homogeneous linear differential equation of the form \[\tfrac{\partial^2}{\partial x^2}Y-qY=0,\] where $q \in F(x)$ is a rational function in $x$ with coefficients in a $Π$-field $F$ of characteristic zero, and $Π$ is a commuting set of parametric derivations. The procedure developed by Dreyfus reduces the computation of $R_u(H)$ to solving a creative telescoping problem, whose effective solution requires the assumption that the maximal reductive quotient $H / R_u(H)$ is a $Π$-constant linear differential algebraic group. When this condition is not satisfied, we compute a new set of parametric derivations $Π'$ such that the associated differential Galois group $H'$ has the property that $H'/ R_u(H')$ is $Π'$-constant, and such that $R_u(H)$ is defined by the same differential equations as $R_u(H')$. Thus the computation of $R_u(H)$ is reduced to the effective computation of $R_u(H')$. We expect that an elaboration of this method will be successful in extending the applicability of some recent algorithms developed by Minchenko, Ovchinnikov, and Singer to compute unipotent radicals for higher order equations.
description: 12 pages
Uniform electron gas at finite temperatures
Creators: name: Sjostrom, Travis
name: Dufty, James
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We calculate the free energy of the quantum uniform electron gas for temperatures from near zero to 100 times the Fermi energy, approaching the classical limit. An extension of the Vashista-Singwi theory to finite temperatures and self-consistent compressibility sum rule is presented. Comparisons are made to other local field correction methods, as well as recent quantum Monte Carlo simulation and classical map based results. Accurate fits to the exchange-correlation free energy from both theory and simulation are given for future practical applications.
General Null Lagrangians and Their Novel Role in Classical Dynamics
Creators: name: Das, Rupam
name: Musielak, Zdzislaw E.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: A method for constructing general null Lagrangians and their higher harmonics is presented for dynamical systems with one degree of freedom. It is shown that these Lagrangians can be used to obtain non-standard Lagrangians, which give equations of motion for the law of inertia and some dissipative dynamical systems. The necessary condition for deriving equations of motion by using null Lagrangians is presented, and it is demonstrated that this condition plays the same role for null Lagrangians as the Euler-Lagrange equation plays for standard and non-standard Lagrangians. The obtained results and their applications establish a novel role of null Lagrangians in classical dynamics.
Economic Impact of Water Pollution Control Regulations on the Tomato Processing Industry
Creators: name: Emerson, Peter M
name: Emerson, Peter M
Publisher: name: Unknown
Year: 1976
Subjects: subject: Agricultural and Food Policy
subject: Crop Production/Industries
subject: Environmental Economics and Policy
subject: Production Economics
subject: Water pollution
subject: Tomato processing
subject: Economic consequences
subject: Waste treatment systems
subject: Plants
subject: Regional production

description: The economic impact of the Federal Water Pollution Control Act Amendments of 1972 on the tomato processing industry is examined. The 1972 Act calls for uniform effluent limitations, and requires that municipalities establish pretreatment standards for waste and recover a proportionate share of capital and operating costs from industrial users. Tomato processors generate a highly seasonal, large-volume, biogradable waste load, characterized by substantial variations in volume and composition among processing plants and throughout the processing season. Municipal treatment, spray irrigation, and evaporation-percolation ponds are the preferred means of pollution abatement. Water pollution control regulations are expected to speed the decline of the tomato processing industry in the East and Midwest as many small plants close. In California the number of large-volume plants may increase slightly. Prices of processed tomato products are expected to rise 1.0 to 4.2 percent per year due to pollution control costs.
Dual Enrollment for College Completion: Findings from Tennessee and Peer States
Creators: name: Karp, Melinda Jane Mechur
name: Hughes, Katherine Lee
name: Cormier, Maria Scott
Publisher: name: Columbia University
Year: 2012
Subjects: Community college students--Education
Community colleges

description: In early 2012, a consortium of stakeholders, including the Committee for Economic Development, the Kresge Foundation, the Nashville Area Chamber of Commerce, the Tennessee Business Roundtable, the Tennessee College Access and Success Network, and the Tennessee State Board of Education, commissioned the Community College Research Center, Teachers College, Columbia University, to conduct a study of dual enrollment in Tennessee and a sample of peer states. Motivated by Tennessee’s college completion agenda and a belief that helping high school students gain access to college coursework can set them on a path to postsecondary credential completion, the Chamber aimed to (1) develop an understanding of the potential benefits to dual enrollment, (2) gain information about and generate lessons from peer states’ dual enrollment experiences, and (3) present possible modifications to Tennessee’s current dual enrollment policies. This report presents finding from the first phase of the study, an examination of dual enrollment research and peer state policies. In Tennessee, dual enrollment refers to an arrangement in which high school students enroll in college courses and earn college credit that is recorded on a regular college transcript. Dual credit refers to an arrangement in which high school courses are aligned or articulated with college courses at a specific postsecondary institution; students who successfully complete the high school version and enroll in the partnering college may subsequently be granted college credit. In this report, we refer to both arrangements by the more general term, dual enrollment.
Turning the Tide: Five Years of Achieving the Dream in Community Colleges
Creators: name: Rutschow, Elizabeth Zachry
name: Richburg-Hayes, Lashawn
name: Orr, Genevieve
name: Cerna, Oscar
name: Cullinan, Dan
name: Kerrigan, Monica Reid
name: Jenkins, Paul Davis
name: Gooden, Susan
name: Martin, Kasey
name: Brock, Thomas
Publisher: name: Columbia University
Year: 2011
Subjects: Community college students--Education
Community colleges

description: In 2004, Lumina Foundation for Education launched “Achieving the Dream: Community Colleges Count,” a national initiative aimed at improving success among community college students, particularly low-income students and students of color. Now encompassing more than 130 institutions in 24 states and the District of Columbia, Achieving the Dream helps community colleges build a “culture of evidence” by using student records and other data to examine students’ performance over time and to identify barriers to academic progress. From there, community colleges are expected to develop intervention strategies designed to improve student outcomes; conduct further research on student progress; and bring effective programs to scale. As a result, it is anticipated that colleges will see measurable improvements over time in student outcomes, including increased progress through developmental education and college-level “gatekeeper” (introductory) courses, grades, persistence, and completion of credentials.
Tropical approximation to finish time of activity networks
Creators: name: Vazquez, Alexei
Publisher: name: arXiv
Year: 2022
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We breakdown complex projects into activities and their logical dependencies. We estimate the project finish time based on the activity durations and relations. However, adverse events trigger delay cascades shifting the finish time. Here I derive a tropical algebraic equation for the finish time of activity networks, encapsulating the principle of linear superposition of exogenous perturbations in the tropical sense. From the tropical algebraic equation I derive the finish time distribution with explicit reference to the distribution of exogenous delays and the network topology and geometry.
description: 5 pages, 4 figures. The figures for simulated projects have an error in v1. The code to calculate the free floats was using w_ij = y_j - x_i instead of the correct expression w_ij = x_j - x_i$ (see Eq. (3)). This error is the actual cause of the anomalies observed in the small sigma region in Figs. 2 and 3. After correcting this coding error, the new Figs. 1, and 3 are shown here
Washington State Student Achievement Initiative: Achievement Points Analysis for Academic Years 2007–2011
Creators: name: Belfield, Clive
Publisher: name: Columbia University
Year: 2012
Subjects: Community college students--Education
Community colleges

description: In 2007, the Washington State Board for Community and Technical Colleges launched the Student Achievement Initiative (SAI), a system-wide policy to reward colleges for improvements in student achievement.  Under this initiative, the state has awarded funds based on how much colleges have increased student achievement relative to prior performance. Under the SAI model, points are awarded to colleges whose students have demonstrated progress in the following six areas: performance on assessment of basic skills; advancement across levels of developmental education; accumulation of 15 college credits; accumulation of 30 college credits; completion of math requirements; and completion of a degree, certificate, or apprenticeship.   The study examines the performance of Washington’s 34 two-year colleges between 2007 and 2011, and finds some modest evidence that momentum improved since SAI was implemented, primarily among students in college-level courses who were making progress toward completion. Nevertheless, about half of students do not accumulate any points. Moving forward, the study concludes, colleges may be more likely to improve student momentum if they focus on the gains that can be made among students when they first enter the institution.
Three-Way Serpentine Slow-Wave Structures with Stationary Inflection Point and Enhanced Interaction Impedance
Creators: name: Marosi, Robert
name: Mealy, Tarek
name: Figotin, Alexander
name: Capolino, Filippo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We introduce two novel variants of the serpentine waveguide slow-wave structure (SWS), often utilized in millimeter-wave traveling-wave tubes (TWTs), with an enhanced interaction impedance. Using dispersion engineering in conjunction with transfer matrix methods, we tune the guided wavenumber dispersion relation to exhibit stationary inflection points (SIPs), and also non-stationary, or tilted inflection points (TIPs), within the dominant TE10 mode of a rectangular waveguide. The degeneracy is found below the first upper band-edge associated with the bandgap where neighboring spatial harmonics meet in the dispersion of the serpentine waveguide (SWG) which is threaded by a beam tunnel. The structure geometries are optimized to be able to achieve an SIP which allows for three-mode synchronism with an electron beam over a specified wavenumber interval in the desired Brillouin zone. Full-wave simulations are used to obtain and verify the existence of the SIP in the three-way coupled waveguide and fine-tune the geometry such that a beam would be in synchronism at or near the SIP. The three-way waveguide SWS exhibits a moderately high Pierce impedance in the vicinity of a nearly-stationary inflection point, making the SWS geometry potentially useful for improving the power gain and basic extraction efficiency of millimeter-wave TWTs. Additionally, the introduced SWS geometries have directional coupler-like behavior, which enables distributed power extraction at frequencies near the SIP frequency.
description: 14 pages, 8 figures
Feed Manufacturing Costs and Capital Requirements
Creators: name: Vosloh, Carl J.
name: Vosloh, Carl J.
Publisher: name: Unknown
Year: 1976
Subjects: subject: Livestock Production/Industries
subject: Production Economics
subject: Productivity Analysis
subject: Research Methods/ Statistical Methods
subject: Mixed feeds
subject: Processing
subject: Economic engineering
subject: costs
subject: formula feeds

description: Costs were synthesized for 99 model feed plants producing between 6 and 50 tons per hour of size of operation and specialization on feed manufacturing costs. These costs were analyzed to show the effect on costs of such factors as: pelleting, packaging, warehousing and utilization of plants' capacity. Plant investment ranged from $368,440 for a 6-ton per hour plant to $1,839,380 for a 50-ton plant, with equipment counting for 35 to 55 percent of the total. Operating costs ranged from $15.16 to $4.80 per ton. Lowest costs were in plants which neither pelleted nor packaged feed. Fixed costs per ton were reduced between 12 and 20 percent for 16 hours of operation rather than 8 hours.
Transverse current current response of graphene at finite temperature, plasmons and absorption
Creators: name: Gutiérrez-Rubio, A.
name: Stauber, T.
name: Guinea, F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We calculate the linear transverse current current response function for graphene at finite temperature and chemical potential. Within the Random Phase Approximation, we then discuss general aspects of transverse plasmons beyond the local response such as their dependence on temperature and on the surrounding dielectric media. We find, e.g., maximal confinement of this mode for a homogeneous dielectric media with refractive index $n\simeq 40$. Confinement can further be enhanced by placing the graphene sheet inside an optical cavity, but there exists a critical width below which no transverse mode can be sustained. For zero doping and finite temperature, there are no well-defined transverse plasmonic excitations in contrast to the longitudinal channel. We also discuss the absorption of electromagnetic radiation in single and double-layer systems for $s$ and $p$ polarizations and point out that the theoretical limit of 50% is reached for $s$-polarized light with incident angle of $θ\approx89^o$.
description: 10 pages, 10 figures
Getting Ready for College: An Implementation and Early Impact Study of Eight Texas Developmental Summer Bridge Programs
Creators: name: Wathington, Heather D.
name: Barnett, Elisabeth
name: Weissman, Evan
name: Teres, Jedediah
name: Pretlow, Joshua
name: Nakanishi, Aki
name: Zeidenberg, Matthew
name: Trimble, Madeline Joy
name: Black, Alison
name: Mitchell, Claire
name: Wachen, John
Publisher: name: Columbia University
Year: 2011
Subjects: Community college students--Education
Community colleges

description: Displayed on billboards and license plates alike, “College for All Texans” is the unofficial motto that is promoted statewide to encourage college readiness, participation, and success in Texas. Policymakers, educators, and business leaders agree that Texas must increase rates of college participation and success to preserve the economic vitality of the state and to secure the future well-being of Texas residents. To address the dynamic needs of the growing state population, Texas launched in 2000 an ambitious statewide strategic plan called called Closing the Gaps by 2015. One of the primary objectives of this plan is to increase enrollment and academic success in Texas colleges and universities. One component of the Closing the Gaps by 2015 initiative was the creation of developmental summer bridge programs — intensive summer experiences that offer eligible students remedial instruction in math, reading, and/or writing along with an introduction to college. Developmental summer bridge programs aim to reduce or eliminate the need for developmental courses so that more students are prepared for college-level courses in their first semester of college. Programs typically offer intensive, targeted coursework for four to five weeks over the summer, accompanied by tutoring, additional labs, and student support services. The integrated approach used in developmental summer bridge programs is thought to help ease students’ transition into college. But despite the increasing popularity of summer bridge programs across the country, little empirical research on their outcomes or impacts has been conducted
Institutional Research and the Culture of Evidence at Community Colleges
Creators: name: Morest, Vanessa Smith
name: Jenkins, Paul Davis
Publisher: name: Columbia University
Year: 2007
Subjects: Community college students--Education
Community colleges

description: This report presents findings from a study on how well prepared today’s community colleges are in moving toward the greater use of data and research to improve student success. Data for the study were drawn from two major sources: first, an e-mail survey of college administrators responsible for IR, and, second, case studies of 28 community colleges. The study finds that community colleges wanting to expand the role of IR face several challenges in terms of resources, data collection, and institutional priorities. It also suggests that college leadership is a key component in making the necessary investment in IR capacity and in promoting changes in organizational practice that are required to embrace a strategy for using data to improve institutional performance.
Quantum Telescopy Clock Games
Creators: name: Czupryniak, Robert
name: Chitambar, Eric
name: Steinmetz, John
name: Jordan, Andrew N.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider the clock game-a task formulated in the framework of quantum information theory-that can be used to improve the existing schemes of quantum-enhanced telescopy. The problem of learning when a stellar photon reaches a telescope is translated into an abstract game, which we call the clock game. A winning strategy is provided that involves performing a quantum non-demolition measurement that verifies which stellar spatio-temporal modes are occupied by a photon without disturbing the phase information. We prove tight lower bounds on the entanglement cost needed to win the clock game, with the amount of necessary entangled bits equaling the number of time-bins being distinguished. This lower bound on the entanglement cost applies to any telescopy protocol that aims to non-destructively extract the time-bin information of an incident photon through local measurements, and our result implies that the protocol of Khabiboulline et al. [\text{Phys. Rev. Lett.} 123, 70504 (2019)] is optimal in terms of entanglement consumption. The full task of the phase extraction is also considered, and we show that the quantum Fisher information of the stellar phase can be achieved by local measurements and shared entanglement without the necessity of nonlinear optical operations. The optimal phase measurement is achieved asymptotically with increasing number of ancilla qubits, whereas a single qubit pair is required if nonlinear operations are allowed.
description: 18 pages, 7 figures