cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Singular equivalences induced by bimodules and quadratic monomial algebras
Creators: name: Chen, Xiao-Wu
name: Liu, Jian
name: Wang, Ren
Publisher: name: arXiv
Year: 2020
Subjects: subject: Representation Theory (math.RT)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 18G80, 16E45, 16D20, 16G20

description: We investigate the problem when the tensor functor by a bimodule yields a singular equivalence. It turns out that this problem is equivalent to the one when the Hom functor given by the same bimodule induces a triangle equivalence between the homotopy categories of acyclic complexes of injective modules. We give conditions on when a bimodule appears in a pair of bimodules, that defines a singular equivalence with level. We construct an explicit bimodule, which yields a singular equivalence between a quadratic monomial algebra and its associated algebra with radical square zero. Under certain conditions which include the Gorenstein cases, the bimodule does appear in a pair of bimodules defining a singular equivalence with level.
description: 20 pages, all comments are welcome!
Higher-level ‘Meta’-Adaptation Mitigates Visual Distortions Produced by Lower-level Adaptation
Creators: name: Liu, Xinyu
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: Cognitive Psychology
subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology

description: This data were collected and reported in manuscript 'Higher-level ‘Meta’-Adaptation Mitigates Visual Distortions Produced by Lower-level Adaptation'
Unsupervised decoding of long-term, naturalistic human neural recordings with automated video and audio annotations
Creators: name: Wang, Nancy X. R.
name: Olson, Jared D.
name: Ojemann, Jeffrey G.
name: Rao, Rajesh P. N.
name: Brunton, Bingni W.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Biological sciences

description: Fully automated decoding of human activities and intentions from direct neural recordings is a tantalizing challenge in brain-computer interfacing. Most ongoing efforts have focused on training decoders on specific, stereotyped tasks in laboratory settings. Implementing brain-computer interfaces (BCIs) in natural settings requires adaptive strategies and scalable algorithms that require minimal supervision. Here we propose an unsupervised approach to decoding neural states from human brain recordings acquired in a naturalistic context. We demonstrate our approach on continuous long-term electrocorticographic (ECoG) data recorded over many days from the brain surface of subjects in a hospital room, with simultaneous audio and video recordings. We first discovered clusters in high-dimensional ECoG recordings and then annotated coherent clusters using speech and movement labels extracted automatically from audio and video recordings. To our knowledge, this represents the first time techniques from computer vision and speech processing have been used for natural ECoG decoding. Our results show that our unsupervised approach can discover distinct behaviors from ECoG data, including moving, speaking and resting. We verify the accuracy of our approach by comparing to manual annotations. Projecting the discovered cluster centers back onto the brain, this technique opens the door to automated functional brain mapping in natural settings.
Sub-femtometer scale color charge fluctuations in a proton made of three quarks and a gluon
Creators: name: Dumitru, Adrian
name: Paatelainen, Risto
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The light-front wave function of a proton composed of three quarks and a perturbative gluon is computed. This is then used to derive expressions for the color charge density correlator $\langleρ^a(\vec q_1)\, ρ^b(\vec q_2)\rangle$ at ${\cal O}(g^4)$ due to the emission of a gluon by one of the quarks in light-cone gauge. The correlator exhibits the soft and collinear singularities. Albeit, we employ exact gluon emission and absorption vertices, and hence the gluon is not required to carry very small light-cone momentum, or to be collinear to the emitting quark. We verify that the correlator satisfies the Ward identity and that it is independent of the renormalization scale, i.e. that ultraviolet divergences cancel. Our expressions provide x-dependent initial conditions for Balitsky-Kovchegov evolution of the C-even part of the dipole scattering matrix to higher energies. That is, we determine the first non-trivial moment of the color charge fluctuations which act as sources for soft color fields in the proton with wavelengths greater than approximately $1/x \sim 10 - 100$.
description: Fixed a few typos, added remarks about x-dependence; to appear in Phys. Rev. D; v3: fixed collinear regulator; v4: corrects symmetry factors of diagrams with internal gluon exchange
The Musca cloud: A 6 pc-long velocity-coherent, sonic filament
Creators: name: Hacar, A.
name: Kainulainen, J.
name: Tafalla, M.
name: Beuther, H.
name: Alves, J.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Filaments play a central role in the molecular clouds' evolution, but their internal dynamical properties remain poorly characterized. To further explore the physical state of these structures, we have investigated the kinematic properties of the Musca cloud. We have sampled the main axis of this filamentary cloud in $^{13}$CO and C$^{18}$O (2--1) lines using APEX observations. The different line profiles in Musca shows that this cloud presents a continuous and quiescent velocity field along its $\sim$6.5 pc of length. With an internal gas kinematics dominated by thermal motions (i.e., $σ_{NT}/c_s\lesssim1$) and large-scale velocity gradients, these results reveal Musca as the longest velocity-coherent, sonic-like object identified so far in the ISM. The transonic properties of Musca present a clear departure from the predicted supersonic velocity dispersions expected in the Larson's velocity dispersion-size relationship, and constitute the first observational evidence of a filament fully decoupled from the turbulent regime over multi-parsec scales.
description: 12 pages, 6 figures; Accepted for publication in A&A
Out of the Closet and Onto the Coast: Aesthetic Zoning as Visual Resource Management
Creators: name: Blatt, David J.L.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1986

description: The North Carolina Supreme Court has recently endorsed the view that aesthetics alone is a proper basis for the exercise of police power in coastal communities. Still, if certain regulatory precautions are not taken, it is possible that important scenic resources will remain unprotected. This investigation provides a theoretical defense for broadening and systematizing the application of aesthetic zoning techniques.
Panoster: End-to-end Panoptic Segmentation of LiDAR Point Clouds
Creators: name: Gasperini, Stefano
name: Mahani, Mohammad-Ali Nikouei
name: Marcos-Ramiro, Alvaro
name: Navab, Nassir
name: Tombari, Federico
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Panoptic segmentation has recently unified semantic and instance segmentation, previously addressed separately, thus taking a step further towards creating more comprehensive and efficient perception systems. In this paper, we present Panoster, a novel proposal-free panoptic segmentation method for LiDAR point clouds. Unlike previous approaches relying on several steps to group pixels or points into objects, Panoster proposes a simplified framework incorporating a learning-based clustering solution to identify instances. At inference time, this acts as a class-agnostic segmentation, allowing Panoster to be fast, while outperforming prior methods in terms of accuracy. Without any post-processing, Panoster reached state-of-the-art results among published approaches on the challenging SemanticKITTI benchmark, and further increased its lead by exploiting heuristic techniques. Additionally, we showcase how our method can be flexibly and effectively applied on diverse existing semantic architectures to deliver panoptic predictions.
description: Preprint of IEEE RA-L article
Modelling telluric line spectra in the optical and infrared with an application to VLT/X-Shooter spectra
Creators: name: Rudolf, N.
name: Günther, H. M.
name: Schneider, P. C.
name: Schmitt, J. H. M. M.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Earth's atmosphere imprints a large number of telluric absorption and emission lines on astronomical spectra, especially in the near infrared, that need to be removed before analysing the affected wavelength regions. These lines are typically removed by comparison to A- or B-type stars used as telluric standards that themselves have strong hydrogen lines, which complicates the removal of telluric lines. We have developed a method to circumvent that problem. For our IDL software package tellrem we used a recent approach to model telluric absorption features with the line-by-line radiative transfer model (LBLRTM). The broad wavelength coverage of the X-Shooter at VLT allows us to expand their technique by determining the abundances of the most important telluric molecules H2O, O2, CO2, and CH4 from sufficiently isolated line groups. For individual observations we construct a telluric absorption model for most of the spectral range that is used to remove the telluric absorption from the object spectrum. We remove telluric absorption from both continuum regions and emission lines without systematic residuals for most of the processable spectral range; however, our method increases the statistical errors. The errors of the corrected spectrum typically increase by 10% for S/N~10 and by a factor of two for high-quality data (S/N~100), i.e. the method is accurate on the percent level. Modelling telluric absorption can be an alternative to the observation of standard stars for removing telluric contamination.
description: accepted by A&A, 10 pages, 6 figures, added note in proof and corrected typo in title
Who Won and Why? North Carolina's Small Cities Compete for Block Grant Stakes
Creators: name: Hollyer, Lynne
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1983

description: A primary objective of the Reagan Administration is to transfer the responsibility for social service and community development programs from the federal government to the state or local level. Accordingly, since 1981, the administration of a considerable number of programs has shifted from Washington to state capitals. A significant component of one of the Department of Housing and Urban Development's (HUD) largest programs, the Small Cities Community Development Block Grant (CDBG), is now administered by many state governments, including North Carolina. This transfer of control represents a significant challenge to the State and its ability to manage a substantial sum of money in accordance with federal and State goals. A review of the State's regulations and the types of funded activities provides some preliminary insights to North Carolina's response to this challenge.
From topological to non-topological solitons: kinks, domain walls and Q-balls in a scalar field model with non-trivial vacuum manifold
Creators: name: Brihaye, Yves
name: Cisterna, Adolfo
name: Hartmann, Betti
name: Luchini, Gabriel
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider a scalar field model with a self-interaction potential that possesses a discrete vacuum manifold. We point out that this model allows for both topological as well as non-topological solitons. In (1+1) dimensions both type of solutions have finite energy, while in (3+1) dimensions, the topological solitons have finite energy per unit area only and correspond to domain walls. Non-topological solitons with finite energy do exist in (3+1) dimensions due to a non-trivial phase of the scalar field and an associated U(1) symmetry of the model, though. We construct these so-called Q-ball solutions numerically, point out the differences to previous studies with different scalar field potentials and also discuss the influence of a minimal coupling to both gravity as well as a U(1) gauge field. In this latter case, the conserved Noether charge Q can be interpreted as the electric charge of the solution.
description: 17 pages including 9 figures; v2: conclusions extended, references added, matches version accepted for publication in Phys. Rev. D
DIN SPEC 3105 - Community version - release 0.10.0
Creators: name: Arndt, Felix
name: Bonvoisin, Jérémy
name: Burkert, Tobias
name: Schattenhofer, Lukas
name: Vos, Jerry De
name: Flüchter, Fabian
name: Häuer, Martin
name: Jäger, Dietrich
name: Wille, Timm
name: Mehera Hassan
name: Mies, Robert
name: Brynmor John
name: Moritz, Manuel
name: Redlich, Tobias
name: Schmidt-Gütter, Christian
name: Velis, Emilio
name: Well, Joost Van
name: Wingerden, Diderik Van
name: Wenzel, Tobias
name: Winter, Lukas
name: Zimmermann, Lars
Publisher: name: Zenodo
Year: 2020
Subjects: open source hardware, standard, documentation, certification, assessment

description: Community version of the DIN SPEC 3105-1 and DIN SPEC 3105-2 as per their first release on June 28th, 2020 on GitLab at https://gitlab.com/OSEGermany/OHS/-/releases. The official version of these documents, published by the DIN and formatted in their template for technical rules is available to registered users of the Beuth Verlag webshop at https://www.beuth.de/en/technical-rule/din-spec-3105-1/324805763 and https://www.beuth.de/en/technical-rule/din-spec-3105-2/324805750.
Redevelopment After The Storm: Hazard Mitigation Opportunities and Obstacles in the Post-Disaster Setting
Creators: name: Hegenbarth, Jane L.
name: Brower, David J.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1985

description: In their cogent analysis of three coastal communities devastated by hurricanes, Hegenbarth and Brower detail the obstacles and consequences of development management planning in disaster-prone areas. The summary of findings presented in this article offers surprising insight into the disincentives for "preemptive storm planning". Notably, severe storms can provide unique opportunities for developers and public recreation offices in cases where land has been "naturally cleared" and thereby made available for new uses. These case studies also illustrate the organizational problems which face many communities in their post-disaster response efforts.
Malware-Resistant Protocols for Real-World Systems
Creators: name: Hackenjos, Timon
Publisher: name: Karlsruher Institut für Technologie (KIT)
Year: 2023

description: Cryptographic protocols are widely used to protect real-world systems from attacks. Paying for goods in a shop, withdrawing money or browsing the Web; all these activities are backed by cryptographic protocols. However, in recent years a potent threat became apparent. Malware is increasingly used in attacks to bypass existing security mechanisms. Many cryptographic protocols that are used in real-world systems today have been found to be susceptible to malware attacks. One reason for this is that most of these protocols were designed with respect to the Dolev-Yao attack model that assumes an attacker to control the network between computer systems but not the systems themselves. Furthermore, most real-world protocols do not provide a formal proof of security and thus lack a precise definition of the security goals the designers tried to achieve. This work tackles the design of cryptographic protocols that are resilient to malware attacks, applicable to real-world systems, and provably secure. In this regard, we investigate three real-world use cases: electronic payment, web authentication, and data aggregation. We analyze the security of existing protocols and confirm results from prior work that most protocols are not resilient to malware. Furthermore, we provide guidelines for the design of malware-resistant protocols and propose such protocols. In addition, we formalize security notions for malware-resistance and use a formal proof of security to verify the security guarantees of our protocols. In this work we show that designing malware-resistant protocols for real-world systems is possible. We present a new security notion for electronic payment and web authentication, called one-out-of-two security, that does not require a single device to be trusted and ensures that a protocol stays secure as long as one of two devices is not compromised. Furthermore, we propose L-Pay, a cryptographic protocol for paying at the point of sale (POS) or withdrawing money at an automated teller machine (ATM) satisfying one-out-of-two security, FIDO2 With Two Displays (FIDO2D) a cryptographic protocol to secure transactions in the Web with one-out-of-two security and Secure Aggregation Grouped by Multiple Attributes (SAGMA), a cryptographic protocol for secure data aggregation in encrypted databases. In this work, we take important steps towards the use of malware-resistant protocols in real-world systems. Our guidelines and protocols can serve as templates to design new cryptographic protocols and improve security in further use cases.
Student Connection
Creators: name: Hebert, Katherine
name: Lawhorn, Julie
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2009

description: The two following reports provide an overview of the many activities within the City and Regional Planning Department at the University of North Carolina. Katherine Hebert touches on the events of the past academic year, while Julie Lawhorn highlights the work of the Diversity Committee. This group is one of a number of committees on which master’s students routinely serve, seeking to facilitate communication with faculty, enhance the curriculum with speakers and trips, and help plan for the future of the department. Includes: DCRP Experiences Unprecedented Growth; DCRP Diversity Committee Update
Numerical equivalence of $\mathbb R$-divisors and Shioda-Tate formula for arithmetic varieties
Creators: name: Dolce, Paolo
name: Gualdi, Roberto
Publisher: name: arXiv
Year: 2020
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 14G40, 14C17, 11G35

description: Let $X$ be an arithmetic variety over the ring of integers of a number field $K$, with smooth generic fiber $X_K$. We give a formula that relates the dimension of the first Arakelov-Chow vector space of $X$ with the Mordell-Weil rank of the Albanese variety of $X_K$ and the rank of the Néron-Severi group of $X_K$. This is a higher dimensional and arithmetic version of the classical Shioda-Tate formula for elliptic surfaces. Such analogy is strengthened by the fact that we show that the numerically trivial arithmetic $\mathbb{R}$-divisors on $X$ are exactly the linear combinations of principal ones. This result is equivalent to the non-degeneracy of the arithmetic intersection pairing in the argument of divisors, partially confirming [GS94, Conjecture 1].
description: 18 pages. Minor changes. New Lemma 3.9
Proton Synchrotron Radiation from Extended Jets of PKS 0637-752 and 3C 273
Creators: name: Bhattacharyya, Wrijupan
name: Gupta, Nayantara
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Recently, the IC/CMB X-ray mechanism has been strongly disfavoured for 3C 273 and PKS 0637-752 since the anomalously hard and steady gamma-ray emission predicted by such models violates the observational results from Fermi-LAT. Here we propose the proton synchrotron origin of the X ray-gamma ray flux from the knots of PKS 0637-752 with a reasonable budget in luminosity, by considering synchrotron radiation from an accelerated proton population. Moreover, for the source 3C 273, some of the optical data points could not be explained by electron synchrotron (Meyer et al. 2015), which we have included in our updated proton synchrotron model. We also show that TeV emission from large scale quasar jets in principle, can arise from proton synchrotron, which we discuss in the context of knot wk8.9 of PKS 0637-752.
description: 8 pages, 5 figures, accepted in The Astrophysical Journal
Water and Sewer Extension Policies as a Technique for Guiding Development
Creators: name: Nugent, Michael
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1975

description: It would be difficult, no doubt, to find any relatively informed observer of urban affairs who would not decry the many undesirable aspects of urban sprawl. Planner and decision-maker alike are too well aware of the substantial costs associated with "leap frog" development on the urban fringe. Cities have grown and continue to grow in this extremely inefficient manner while possessing a potentially potent tool for regulating the location and timing of this development—the provision of municipal water and sewer services.
Growing Water Demand: A Concern for Piedmont and Mountain Regions
Creators: name: Allenstein, Karen
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1983

description: Many regions in North Carolina have experienced tremendous increases in population growth and industrial development in the past decade. As shown in Figure 1, latest projections by the Bureau of Economic Development point to a continuation of this growth pattern, with the Piedmont and Mountain regions of the state being no exception to this trend (from Heath, Ralph C, Better Utilization of Ground Water in the Piedmont and Mountain Regions of the Southeast, 1978). Census records show that the populations of the Piedmont and Mountain regions are increasing at a rate of a little over one percent per year with an anticipated doubling of the population by the year 2020. One of the many implications of this dramatic growth pattern is the apparent depletion of municipalities' current water supplies. As seen in Figure 2, most public water supplies in the regions are from surface water sources; specifically, streams, lakes and reservoirs. To keep pace with demand, new surface water sources will have to be developed on a large scale. Conservative estimates for the region as a whole indicate a three-fold increase in all water uses over the next forty years. Obviously, this necessitates extensive development of additional sources.
How Big Can a Black Hole Grow?
Creators: name: King, Andrew
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: I show that there is a physical limit to the mass of a black hole, above which it cannot grow through luminous accretion of gas, and so cannot appear as a quasar or active galactic nucleus. The limit is Mmax \simeq 5x10^{10}M_sun for typical parameters, but can reach Mmax \simeq 2.7x10^{11}M_sun in extreme cases (e.g. maximal prograde spin). The largest black hole masses so far found are close to but below the limit. The Eddington luminosity \simeq 6.5x10^{48} erg/s corresponding to Mmax is remarkably close to the largest AGN bolometric luminosity so far observed. The mass and luminosity limits both rely on a reasonable but currently untestable hypothesis about AGN disc formation, so future observations of extreme SMBH masses can therefore probe fundamental disc physics. Black holes can in principle grow their masses above Mmax by non-luminous means such as mergers with other holes, but cannot become luminous accretors again. They might nevertheless be detectable in other ways, for example through gravitational lensing. I show further that black holes with masses ~ Mmax can probably grow above the values specified by the black-hole -- host-galaxy scaling relations, in agreement with observation.
description: to appear in MNRAS Letters; 4 pages, 1 figure, replaced by proof version
Optical Properties of Rydberg Excitons and Polaritons
Creators: name: Zielińska-Raczyńska, Sylwia
name: Czajkowski, Gerard
name: Ziemkiewicz, David
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We show how to compute the optical functions when Rydberg Excitons appear, including the effect of the coherence between the electron-hole pair and the electromagnetic field. We use the Real Density Matrix Approach (RDMA), which, combined with Green's function method, enables one to derive analytical expressions for the optical functions. Choosing the susceptibility, we performed numerical calculations appropriate to a Cu$_2$0 crystal. The effect of the coherence is displayed in the line shape. We also examine in details and explain the dependence of the oscillator strength and the resonance placement on the state number. We report a good agreement with recently published experimental data.
description: 16 pages, 5 figures, submitted to PRB
Type IIA Klebanov-Strassler: the hard way
Creators: name: Pasini, Giulio
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct the T-dual of the Klebanov-Strassler solution on a small region at the tip of the deformed conifold. The isometry coordinate we choose is the correct one to obtain an NS5 brane wrapping a holomorphic curve in Type IIA, as shown by a thorough analysis of the deformed conifold geometry. The shape of the locus wrapped by the NS5 brane matches the predictions from the Type IIA brane engineering construction dual to the $SU(N+M) \times SU(N)$ cascading gauge theory. The same isometry is then used to T-dualize the solution obtained by adding backreacted D3 branes to the Klebanov-Strassler solution. Our construction is the first step in a program to test the stability of antibranes in Type IIA backgrounds.
description: 29 pages, 2 figures, references updated
Painful Lessons From Piney Mountain: A Framework For Development Dispute Resolution
Creators: name: Hodges-Copple, John
name: Holway, Jim
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1986

description: Can the problems and positions encountered in certain development disputes effectively prevent any meaningful negotiation? Are there situations where a win-win outcome is not achieveable? The analysis presented in this case study suggests approaches that can be utilized by municipalities to avoid no-win situations.
A nebular analysis of the central Orion Nebula with MUSE
Creators: name: Leod, A. F. Mc
name: Weilbacher, P. M.
name: Ginsburg, A.
name: Dale, J. E.
name: Ramsay, S.
name: Testi, L.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: A nebular analysis of the central Orion Nebula and its main structures is presented. We exploit MUSE integral field observations in the wavelength range 4595-9366 Å to produce the first O, S and N ionic and total abundance maps of a region spanning 6' x 5' with a spatial resolution of 0.2". We use the S$_{23}$ ( = ([SII]$λ$6717,31+[SIII]$λ$9068)/H$β$) parameter, together with [OII]/[OIII] as an indicator of the degree of ionisation, to distinguish between the various small-scale structures. The only Orion Bullet covered by MUSE is HH 201, which shows a double component in the [FeII]$λ$8617 line throughout indicating an expansion, and we discuss a scenario in which this object is undergoing a disruptive event. We separate the proplyds located south of the Bright Bar into four categories depending on their S$_{23}$ values, propose the utility of the S$_{23}$ parameter as an indicator of the shock-contribution to the excitation of line-emitting atoms, and show that the MUSE data is able to identify the proplyds associated with disks and microjets. We compute the second order structure function for the H$α$, [OIII]$λ$5007, [SII]$λ$6731 and [OI]$λ$6300 emission lines to analyse the turbulent velocity field of the region covered with MUSE. We find that the spectral and spatial resolution of MUSE is not able to faithfully reproduce the structure functions of previous works.
description: 34 pages, 31 figures, published in MNRAS, added missing citation
Homeownership as Public Policy: Trends in North Carolina and Beyond
Creators: name: Basolo, Victoria
name: Rohe, William M.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1995

description: The importance of homeownership is deeply embedded in our society. Historians, writers, and the average person attribute intrinsic value to owning one's home. Walt Whitman, for example, wrote "A man is not whole and complete. ..unless he owns a house." Society also associates more tangible social and economic benefits with ownership such as enhanced pride in the community and tax advantages. These benefits, however, elude many low- and moderate- income households because they lack the financial resources to purchase a home. Public officials also herald the virtues of homeownership and have developed policies to increase homeownership for low - and moderate-income households. Government assistance for homeownership at the federal level appeared decades ago with the creation of the Federal Housing Administration, and more recently, state and local governments have taken an active role in the promotion of homeownership. Although homeownership policies and programs involve investment of public dollars, strong political support for these policies exists across communities and among levels of government. As a result, there are many publicly-sponsored homeownership programs operating in communities throughout the country. In the rush to jump on the homeownership bandwagon, however, the potential pitfalls of homeownership programs are often overlooked by their sponsors. In addition, program planning may be minimal and evaluation of programs may be completely absent from the process. This article examines the popularity of homeownership and its desirability as a policy outcome in our society. We begin by discussing the homeownership ideology and ownership trends in the United States. Within this discussion, we present the advantages and disadvantages of homeownership for both the individual and society. We then narrow our discussion to homeownership and related policies and programs in North Carolina. We consider the patterns and trends of homeownership, analyze the affordability of ownership for lower-income households, discuss the intergovernmental aspect of homeownership efforts, and consider some of the public and private strategies used to increase homeownership in the State. Next, we highlight homeownership efforts in two North Carolina cities: Charlotte and Durham. Finally, we offer some concluding remarks and recommendations on the development of homeownership policies and programs in local communities.
Book Review: Networks Cities
Creators: name: Hedglin, Daniel
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2013

description: Post-Mao China has undergone a level of urbanization that is unprecedented in size and speed. Large districts, cities, and even regions have appeared where little used to exist. Chinese planners have generally used traditional, mono-zone strategies with high densities to accommodate this growth. James Brearley and Fang Qun’s bilingual Chinese and English-language book Networks Cities, provides a mixture of essays, master plans, and case studies throughout China that highlight the shortcomings of this traditional planning model and offers a vision on how innovative planning techniques can provide a more sustainable foundation for China’s future growth.
Dirac and Maxwell systems in split octonions
Creators: name: Gogberashvili, Merab
name: Gurchumelia, Alexandre
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The known equivalence of 8-dimensional chiral spinors and vectors, also referred to as triality, is discussed for (4+4)-space. Split octonionic representation of SO(4,4) and Spin(4,4) groups and the trilinear invariant form are explicitly written and compared with Clifford algebraic matrix representation. It is noted that the complete algebra of split octonionic basis units can be recovered from the Moufang and Malcev relations for the three vector-like elements. Lagrangians on split octonionic fields that generalize Dirac and Maxwell systems are constructed using group invariant forms. It is shown that corresponding equations are related to split octonionic analyticity conditions.
description: published version, 19 pages, no figures
IEMP Tunisian Stambeli
Creators: name: Jankowsky, Richard
name: Tarsitani, Simone
name: Clayton, Martin
Publisher: name: Open Science Framework
Year: 2022
Subjects: subject: Arts and Humanities
subject: African Languages and Societies
subject: Ethnomusicology
subject: Music
subject: Music Performance

description: A collection of audio recordings of Tunisian Stambeli performances, with detailed annotations.
Strongly interacting one-dimensional quantum gas mixtures with weak p-wave interactions
Creators: name: Hu, Haiping
name: Pan, Lei
name: Chen, Shu
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study one-dimensional strongly interacting quantum gas mixtures, including both the Bose-Fermi and spin-1/2 Fermi-Fermi mixtures, with weak p-wave interactions between intra-component fermions, and demonstrate that the weak p-wave interaction can not be omitted in the strongly interacting regime where the strength of p-wave interactions is comparable with the inverse of the strength of strongly repulsive s-wave interactions. While the total density distribution is not sensitive to the weak p-wave interaction, we find that the p-wave interaction plays an important role in determining the species-dependent (or spin-dependent) density distributions and produces significant physical effects on the low-energy spin dynamics. We also derive effective spin-exchange models for strongly interacting quantum gas mixtures with weak p-wave interactions, which indicate that a quantum phase transition from anti-ferromagnetic state to ferromagnetic state can be induced by tuning the relative strengths of intra-component and inter-component interactions.
description: 10 pages, 5 figures
A global galactic dynamo with a corona constrained by relative helicity
Creators: name: Prasad, A.
name: Mangalam, A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a model for a global axisymmetric turbulent dynamo operating in a galaxy with a corona which treats the supernovae (SNe) and magneto-rotational instability (MRI) driven turbulence parameters under a common formalism. The nonlinear quenching of the dynamo is alleviated by inclusion of small-scale advective and diffusive magnetic helicity fluxes, which allow the gauge invariant magnetic helicity to be transferred outside the disk and consequently build up a corona during the course of dynamo action. The time-dependent dynamo equations are expressed in a separable form and solved through an eigenvector expansion constructed using the steady-state solutions of the dynamo equation. The parametric evolution of the dynamo solution allows us to estimate the final structure of the global magnetic field and the saturated value of the turbulence parameter $α_m$, even before solving the dynamical equations for evolution of magnetic fields in the disk and the corona, along with $α$-quenching. We then solve these equations simultaneously to study the saturation of large-scale magnetic field, its dependence on the small-scale magnetic helicity fluxes and corresponding evolution of the force-free field in the corona. The quadrupolar large-scale magnetic field in the disk is found to reach equipartition strength within a timescale of 1 Gyr. The large-scale magnetic field in the corona obtained is much weaker in strength compared to the field inside the disk and has only a weak impact on the dynamo operation.
description: 59 pages, 14 figures, 37 sub-figures, 2 tables and 7 appendices. Accepted for publication in ApJ
Student Connection
Creators: name: Page, Nathan
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2014

description: This year has been a busy one for the Department of City and Regional Planning (DCRP)! Mirroring the trend of planning’s widening scope, increasing numbers of students are choosing to participate in dual degree programs, including public health, government, business, law, and environmental sciences. Even those who are solely in the planning program are reaching beyond the bounds of the established concentration areas to widen their skill sets and work across traditional boundaries. DCRP students this year expanded their learning opportunities by organizing and attending in-house symposiums, traveling to conferences, and participating in unique and challenging class assignments.
Classification of Conformal Representations Induced from the Maximal Cuspidal Parabolic
Creators: name: Dobrev, V. K.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: In the present paper we continue the project of systematic construction of invariant differential operators on the example of representations of the conformal algebra induced from the maximal cuspidal parabolic.
description: 13 pages, 5 figures; V2: small corrections
SRECG: ECG Signal Super-resolution Framework for Portable/Wearable Devices in Cardiac Arrhythmias Classification
Creators: name: Chen, Tsai-Min
name: Tsai, Yuan-Hong
name: Tseng, Huan-Hsin
name: Liu, Kai-Chun
name: Chen, Jhih-Yu
name: Huang, Chih-Han
name: Li, Guo-Yuan
name: Shen, Chun-Yen
name: Tsao, Yu
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: A combination of cloud-based deep learning (DL) algorithms with portable/wearable (P/W) devices has been developed as a smart heath care system to support automatic cardiac arrhythmias (CAs) classification using electrocardiography (ECG). However, long-term and continuous ECG monitoring is challenging because of limitations of batteries and transmission bandwidth of P/W devices while incorporated with consumer electronics (CE). A feasible approach to address this challenge is to decrease sampling rates. However, low sampling rates lead to low-resolution signals that hinder the CAs classification performance. In this study, we propose a DL-based ECG signal super-resolution framework (called SRECG) to enhance low-resolution ECG signals by jointly considering the accuracies when applied to the DL-based high-resolution multiclass classifier (HMC) of CAs. In our experiments, we downsampled the ECG signals from the CPSC2018 dataset and evaluated their HMC accuracies with and without the SRECG. Experimental results show that SRECG can well improve the HMC accuracies as compared to traditional interpolation methods. Moreover, approximately half of the CAs classification accuracies of HMC were maintained within the enhanced ECG signals by SRECG. The promising results confirm that SRECG can be suitably used to enhance low-resolution ECG signals from P/W devices with CE to improve their cloud-based HMC performances.
Shortcuts to adiabaticity: Suppression of pair production in driven Dirac dynamics
Creators: name: Deffner, Sebastian
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Achieving effectively adiabatic dynamics in finite time is a ubiquitous goal in virtually all areas of modern physics. So-called shortcuts to adiabaticity refer to a set of methods and techniques that allow to produce in a short time the same final state that would result from an adiabatic, infinitely slow process. In the present work we generalize one of these methods -- the fast-forward technique -- to driven Dirac dynamics. As a main result we find that shortcuts to adiababticity for the $(1+1)$-dimensional Dirac equation are facilitated by a combination of both, scalar and pseudoscalar potentials. Our findings are illustrated for two analytically solvable examples, namely charged particles driven in spatially homogeneous and linear vector fields.
description: 14 pages, 2 figures; published version
John DeGrove on Growth Management, Regionalism, and Sustainable Development
Creators: name: Bryant, Kevin
name: Inerfeld, Robert
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1997

description: John DeGrove directs the Florida Atlantic University/Florida International University Joint Center for Environmental and Urban Problems. He is a member of the Governor's Commission for a Sustainable South Florida and chairs the Commission's Committee on Urban Form, Intergovernmental Coordination, and Governance. He wrote The New Frontier for Land Policy: Planning and Growth Management in the States, published in 1992 by the Lincoln Institute for Land Policy. The authors interviewed him by phone after he lectured at the Department of City and Regional Planning's 1997 Sustainable Development Lecture Series.
$S_N$ Orbifolds and String Interactions
Creators: name: Jevicki, Antal
name: Yoon, Junggi
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study interacting features of $S_N$ Orbifold CFTs. Concentrating on characters (associated with $S_N$ Orbifold primaries) we first formulate a novel procedure for evaluating them through $GL(\infty)_+$ tracing. The result is a polynomial formula which we show gives results equivalent to those found by Bantay. From this we deduce a hierarchy of commuting Hamiltonians featuring locality in the induced space, and nonlinear string-type interactions.
description: 34 pages, 3 figures; v2: minor changes, references added
Book Review: Why Good People Can’t Get Jobs
Creators: name: Stern, Julianne
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2013

description: In a slim new volume, Why Good People Can’t Get Jobs, Wharton management professor Peter Cappelli argues that there is a market failure in how firms match up their demand for work with the supply of skills. The underlying problem that occupies most of Cappelli’s analysis is that the tight labor market of the 1990s gave employers the luxury of defaulting to what he calls a “Home Depot” approach to jobs, where firms see workers as interchangeable, readily available replacement parts. Implicit in this approach are the ideas that a job description is static and that a job candidate should be able to “hit the ground running,” an ability which candidates demonstrate to hiring managers (or software) primarily by having performed the exact same duties in a previous job. The deleterious role of hiring systems has been the most widely discussed element of Cappelli’s argument. But this automation and concomitant reduced analytical capability of human resources departments is only a symptom of a bigger problem with how firms define and identify worker skill requirements.
The chromatic profile of locally bipartite graphs
Creators: name: Illingworth, Freddie
Publisher: name: arXiv
Year: 2020
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C15, 05C35

description: In 1973, Erdős and Simonovits asked whether every $n$-vertex triangle-free graph with minimum degree greater than $1/3 \cdot n$ is 3-colourable. This question initiated the study of the chromatic profile of triangle-free graphs: for each $k$, what minimum degree guarantees that a triangle-free graph is $k$-colourable. This problem has a rich history which culminated in its complete solution by Brandt and Thomassé. Much less is known about the chromatic profile of $H$-free graphs for general $H$. Triangle-free graphs are exactly those in which each neighbourhood is one-colourable. Locally bipartite graphs, first mentioned by Luczak and Thomassé, are the natural variant of triangle-free graphs in which each neighbourhood is bipartite. Here we study the chromatic profile of locally bipartite graphs. We show that every $n$-vertex locally bipartite graph with minimum degree greater than $4/7 \cdot n$ is 3-colourable ($4/7$ is tight) and with minimum degree greater than $6/11 \cdot n$ is 4-colourable. Although the chromatic profiles of locally bipartite and triangle-free graphs bear some similarities, we will see there are striking differences.
description: 35 pages, 29 figures. Final version
Planning City Entryways: Highway Corridors in Raleigh
Creators: name: Clark, Marion F.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1995

description: This article describes the planning and design process used by the City of Raleigh to create and implement a plan to enhance the visual and natural resources of one of the city's entryways. The plan blends land use, transportation, and visual resource recommendations in order to clear up strip development, expand the industrial land use base, and improve transportation along the corridor.
Hydrodynamic interactions of cilia on a spherical body
Creators: name: Nasouri, Babak
name: Elfring, Gwynn J.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Microorganisms develop coordinated beating patterns on surfaces lined with cilia known as metachronal waves. For a chain of cilia attached to a flat ciliate, it has been shown that hydrodynamic interactions alone can lead the system to synchronize. However, several microorganisms possess a curve shaped ciliate body and so to understand the effect of this geometry on the formation of metachronal waves, we evaluate the hydrodynamic interactions of cilia near a large spherical body. Using a minimal model, we show that for a chain of cilia around the sphere, the natural periodicity in the geometry leads the system to synchronize. We also report an emergent wave-like behavior when an asymmetry is introduced to the system.