cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Higher moments of arithmetic functions in short intervals: a geometric perspective
Creators: name: Hast, Daniel
name: Matei, Vlad
Publisher: name: arXiv
Year: 2016
Subjects: subject: Number Theory (math.NT)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 11T55, 11G25

description: We study the geometry associated to the distribution of certain arithmetic functions, including the von Mangoldt function and the Möbius function, in short intervals of polynomials over a finite field $\mathbb{F}_q$. Using the Grothendieck-Lefschetz trace formula, we reinterpret each moment of these distributions as a point-counting problem on a highly singular complete intersection variety. We compute part of the $\ell$-adic cohomology of these varieties, corresponding to an asymptotic bound on each moment for fixed degree $n$ in the limit as $q \to \infty$. The results of this paper can be viewed as a geometric explanation for asymptotic results that can be proved using analytic number theory over function fields.
description: 25 pages
Coin Toss Modeling
Creators: name: Stefan, Razvan C.
name: Cheche, Tiberius O.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Popular Physics (physics.pop-ph)
subject: FOS: Physical sciences

description: The torque-free motion of rigid body in gravitational field is analyzed. The coin lands on a soft surface (such as the palm of the hand) that allows no bouncing. The model assumes the coin as a rigid body with constant angular momentum vector in the body frame, and no air resistance. Unbiased probabilities of heads and tails are obtained for various initial conditions accessible to a usual person.
description: 11 pages, 11 figures
Channel Estimation for Diffusive Molecular Communications
Creators: name: Jamali, Vahid
name: Ahmadzadeh, Arman
name: Jardin, Christophe
name: Sticht, Heinrich
name: Schober, Robert
Publisher: name: arXiv
Year: 2016
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In molecular communication (MC) systems, the \textit{expected} number of molecules observed at the receiver over time after the instantaneous release of molecules by the transmitter is referred to as the channel impulse response (CIR). Knowledge of the CIR is needed for the design of detection and equalization schemes. In this paper, we present a training-based CIR estimation framework for MC systems which aims at estimating the CIR based on the \textit{observed} number of molecules at the receiver due to emission of a \textit{sequence} of known numbers of molecules by the transmitter. Thereby, we distinguish two scenarios depending on whether or not statistical channel knowledge is available. In particular, we derive maximum likelihood (ML) and least sum of square errors (LSSE) estimators which do not require any knowledge of the channel statistics. For the case, when statistical channel knowledge is available, the corresponding maximum a posteriori (MAP) and linear minimum mean square error (LMMSE) estimators are provided. As performance bound, we derive the classical Cramer Rao (CR) lower bound, valid for any unbiased estimator, which does not exploit statistical channel knowledge, and the Bayesian CR lower bound, valid for any unbiased estimator, which exploits statistical channel knowledge. Finally, we propose optimal and suboptimal training sequence designs for the considered MC system. Simulation results confirm the analysis and compare the performance of the proposed estimation techniques with the respective CR lower bounds.
description: to be appeared in IEEE Transactions on Communications. arXiv admin note: text overlap with arXiv:1510.08612
Rational points on solvable curves over $\mathbb{Q}$ via non-abelian Chabauty
Creators: name: Ellenberg, Jordan S.
name: Hast, Daniel Rayor
Publisher: name: arXiv
Year: 2017
Subjects: subject: Number Theory (math.NT)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 11G30, 14H30

description: We study the Selmer varieties of smooth projective curves of genus at least two defined over $\mathbb{Q}$ which geometrically dominate a curve with CM Jacobian. We extend a result of Coates and Kim to show that Kim's non-abelian Chabauty method applies to such a curve. By combining this with results of Bogomolov-Tschinkel and Poonen on unramified correspondences, we deduce that any cover of $\mathbf{P}^1$ with solvable Galois group, and in particular any superelliptic curve over $\mathbb{Q}$, has only finitely many rational points over $\mathbb{Q}$.
description: 17 pages
title: A Comparison of Nursing Role Conceptions Among Baccalaureate Nursing Students, Their Nursing Faculty, and Clinical Nurse Mentors
Creators: name: Musella, Michele Lynn
Publisher: name: Old Dominion University Libraries
Year: 1987

description: This descriptive study focused on the bureaucratic, professional, and service role conceptions of nurses. It was hypothesized that there are significant differences in the ideal and actual perceptions of these role orientations among baccalaureate nursing students, their nursing faculty, and their clinical nurse mentors. The three subscales of Pieta's 1976 Nursing Role Conception Scale (NRC) were used. The results of a discriminant analysis indicated significant differences in professional and service nursing role conceptions among students and both their nursing faculty and clinical mentors (p<.000). An evaluation of the reliability and validity of the NRC revealed that selected instrument items need to be revised and refined for more internal consistency and to reflect more contemporary content validity.
Spontaneous CP violation in the 2HDM: physical conditions and the alignment limit
Creators: name: Grzadkowski, B.
name: Ogreid, O. M.
name: Osland, P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: For the general Two-Higgs-Doublet model, we present conditions for having spontaneous CP violation, in terms of physical masses and couplings. These relations involve the charged-Higgs mass, its cubic couplings with neutral scalars and quartic coupling, and become particularly simple in the alignment limit. In the simplified model with softly broken $Z_2$ symmetry, some deviation from alignment is required for spontaneous CP violation to be present.
description: 22 pages
A fast algorithm for regularized focused 3-D inversion of gravity data using the randomized SVD
Creators: name: Vatankhah, Saeed
name: Renaut, Rosemary A.
name: Ardestani, Vahid E.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: A fast algorithm for solving the under-determined 3-D linear gravity inverse problem based on the randomized singular value decomposition (RSVD) is developed. The algorithm combines an iteratively reweighted approach for $L_1$-norm regularization with the RSVD methodology in which the large scale linear system at each iteration is replaced with a much smaller linear system. Although the optimal choice for the low rank approximation of the system matrix with m rows is q=m, acceptable results are achievable with q<
From citizen to police officer
Creators: name: Anse Stevens
name: Verhage, Antoinette
Publisher: name: Zenodo
Year: 2023
Subjects: Police recruitment
Police selection
Police profile

description: This poster is based on a book chapter that aimed to provide insight into the role of recruitment and selection in the police organisation because they determine the influx into the police force. There are few professions where the entry is as formalised as that of a police officer. People need to complete the steps of recruitment, selection and training when joining the organisation. By going through these different stages, a citizen ‘transforms’ into a policeman or woman. This has an impact on how a person functions and adapts to certain attitudes, values and norms. A process that is referred to as police socialisation or ‘becoming blue’. Concepts such as socialisation, recruitment, and selection are key in this process. A brief overview of the profile of selected candidates in Belgium will be provided based on survey data from 1113 police recruits at three levels (base level, middle-management level and senior officer level). The role of the recruitment and selection will be considered. The survey is part of a PhD study and aims to gain insight into the profile of selected police candidates.
All-optical switching via four-wave mixing Bragg scattering in a silicon platform
Creators: name: Zhao, Yun
name: Lombardo, David
name: Mathews, Jay
name: Agha, Imad
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We employ the process of non-degenerate four-wave mixing Bragg scattering (FWM-BS) to demonstrate all-optical control in a silicon platform. In our configuration, a strong, non-information-carrying pump is mixed with a weak control pump and an input signal in a silicon-on-insulator waveguide. Through the optical nonlinearity of this highly-confining waveguide, the weak pump controls the wavelength conversion process from the signal to an idler, leading to a controlled depletion of the signal. The strong pump, on the other hand, plays the role of a constant bias. In this work, we show experimentally that it is possible to implement this low-power switching technique as a first step towards universal optical logic gates, and test the performance with random binary data. Even at very low powers, where the signal and control pump levels are almost equal, the eye-diagrams remain open, indicating a successful operation of the logic gates.
description: 7 pages, 5 figures
ABC News/Washington Post Poll: March 2020 Coronavirus
Creators: name: ABC News
name: Washington Post
Publisher: name: Roper Center for Public Opinion Research
Year: 2020

description: President Donald Trump approval (3); Democratic nomination for president (1); Trump vs. Vice President Joe Biden for US President (1); enthusiastic about supporting Biden/Trump (2); Trump vs. Biden trust on issues (3); trust in government/hospitals to respond effectively to coronavirus outbreaks (3); Trump speed in addressing coronavirus (1); worries about catching coronavirus (1); life disrupted by coronavirus (1); coronavirus stress (1); coronavirus test and diagnosis (5); changes in behavior due to coronavirus outbreaks (6); teleworking (3); recession (2); government economic response to coronavirus (3); economic impacts of coronavirus (6); registered to vote (1).
Type-II Dirac surface states in topological crystalline insulators
Creators: name: Chiu, Ching-Kai
name: Chan, Y. -H.
name: Li, Xiao
name: Nohara, Y.
name: Schnyder, A. P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the properties of a family of anti-pervoskite materials, which are topological crystalline insulators with an insulating bulk but a conducting surface. Using ab-initio DFT calculations, we investigate the bulk and surface topology and show that these materials exhibit type-I as well as type-II Dirac surface states protected by reflection symmetry. While type-I Dirac states give rise to closed circular Fermi surfaces, type-II Dirac surface states are characterized by open electron and hole pockets that touch each other. We find that the type-II Dirac states exhibit characteristic van-Hove singularities in their dispersion, which can serve as an experimental fingerprint. In addition, we study the response of the surface states to magnetic fields.
description: 8 pages, 5 figures
Admissible decomposition for spectral multipliers on Gaussian L^p
Creators: name: Kemppainen, Mikko
Publisher: name: arXiv
Year: 2016
Subjects: subject: Functional Analysis (math.FA)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 42B25 (Primary), 42B15, 42B30 (Secondary)

description: This paper concerns harmonic analysis of the Ornstein--Uhlenbeck operator L on the Euclidean space. We examine the method of decomposing a spectral multiplier ϕ(L) into three parts according to the notion of admissibility, which quantifies the doubling behaviour of the underlying Gaussian measure γ. We prove that the above-mentioned admissible decomposition is bounded in L^p(γ) for 1 < p \leq 2 in a certain sense involving the Gaussian conical square function. The proof relates admissibility with E. Nelson's hypercontractivity theorem in a novel way.
description: 11 pages
Total variation regularization of the $3$-D gravity inverse problem using a randomized generalized singular value decomposition
Creators: name: Vatankhah, Saeed
name: Renaut, Rosemary A.
name: Ardestani, Vahid E.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: We present a fast algorithm for the total variation regularization of the $3$-D gravity inverse problem. Through imposition of the total variation regularization, subsurface structures presenting with sharp discontinuities are preserved better than when using a conventional minimum-structure inversion. The associated problem formulation for the regularization is non linear but can be solved using an iteratively reweighted least squares algorithm. For small scale problems the regularized least squares problem at each iteration can be solved using the generalized singular value decomposition. This is not feasible for large scale problems. Instead we introduce the use of a randomized generalized singular value decomposition in order to reduce the dimensions of the problem and provide an effective and efficient solution technique. For further efficiency an alternating direction algorithm is used to implement the total variation weighting operator within the iteratively reweighted least squares algorithm. Presented results for synthetic examples demonstrate that the novel randomized decomposition provides good accuracy for reduced computational and memory demands as compared to use of classical approaches.
Blind Image Fusion for Hyperspectral Imaging with the Directional Total Variation
Creators: name: Bungert, Leon
name: Coomes, David A.
name: Ehrhardt, Matthias J.
name: Rasch, Jennifer
name: Reisenhofer, Rafael
name: Schönlieb, Carola-Bibiane
Publisher: name: arXiv
Year: 2017
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Numerical Analysis (math.NA)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: 49M37, 65K10, 90C30, 90C90

description: Hyperspectral imaging is a cutting-edge type of remote sensing used for mapping vegetation properties, rock minerals and other materials. A major drawback of hyperspectral imaging devices is their intrinsic low spatial resolution. In this paper, we propose a method for increasing the spatial resolution of a hyperspectral image by fusing it with an image of higher spatial resolution that was obtained with a different imaging modality. This is accomplished by solving a variational problem in which the regularization functional is the directional total variation. To accommodate for possible mis-registrations between the two images, we consider a non-convex blind super-resolution problem where both a fused image and the corresponding convolution kernel are estimated. Using this approach, our model can realign the given images if needed. Our experimental results indicate that the non-convexity is negligible in practice and that reliable solutions can be computed using a variety of different optimization algorithms. Numerical results on real remote sensing data from plant sciences and urban monitoring show the potential of the proposed method and suggests that it is robust with respect to the regularization parameters, mis-registration and the shape of the kernel.
description: 24 pages, 18 figures, published in Inverse Problems, typo corrected, figure added
Big polynomial rings and Stillman's conjecture
Creators: name: Erman, Daniel
name: Sam, Steven V
name: Snowden, Andrew
Publisher: name: arXiv
Year: 2018
Subjects: subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 13A02, 13D02

description: The purpose of this paper is to prove that certain limits of polynomial rings are themselves polynomial rings, and show how this observation can be used to deduce some interesting results in commutative algebra. In particular, we give two new proofs of Stillman's conjecture. The first is similar to that of Ananyan-Hochster, though more streamlined; in particular, it establishes the existence of small subalgebras. The second proof is completely different, and relies on a recent noetherianity result of Draisma.
description: 21 pages. v4: removes all hypotheses that we are working over an infinite ground field. v5: Fixes a gap in the proof of Lemma 5.11
title: Job Satisfaction and Retention: Outcomes Since Implementation of Three Scheduling Options
Creators: name: Newnam, Katherine Marie
Publisher: name: Old Dominion University Libraries
Year: 1990

description: The purpose of this descriptive study was to determine if flexible scheduling options influenced retention and job satisfaction of 109 full time registered staff nurses within a selected hospital setting. The Anticipated Turnover Model, developed by Hinshaw and Atwood (1984) provided the theoretical framework for the study. Perceived job satisfaction was measured by the Nursing Job Satisfaction Scale (Hinshaw & Atwood, 1984). The Anticipated Turnover Scale (Hinshaw & Atwood, 1984) measured the possibility of voluntary termination by sample respondents. The respondents were divided into three groups according to three schedule options: Group 1, 12 hour, weekend only (Baylor); Group 2, 12 hour shifts; and Group 3, 8 hour shifts. Turnover rates for the hospital used in this study were compared before and after implementation of the three scheduling options. Results indicated a statistically significant decrease in actual turnover rates after the implementation of three scheduling options. While there were no significant differences between nurses working one of three scheduling options on perceived job satisfaction or anticipated turnover, overall job satisfaction and decreased anticipated turnover for all respondents of the study were documented.
A Primal-Dual Interior Point Method for a Novel Type-2 Second Order Cone Optimization Problem
Creators: name: Morshed, Md Sarowar
name: Vogiatzis, Chrysafis
name: Noor-E-Alam, Md.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: In this paper, we define a new, special second order cone as a type-$k$ second order cone. We focus on the case of $k=2$, which can be viewed as SOCO with an additional {\em complicating variable}. For this new problem, we develop the necessary prerequisites, based on previous work for traditional SOCO. We then develop a primal-dual interior point algorithm for solving a type-2 second order conic optimization (SOCO) problem, based on a family of kernel functions suitable for this type-2 SOCO. We finally derive the following iteration bound for our framework: \[\frac{L^γ}{θκγ} \left[2N ψ\left( \frac{\varrho \left(τ/4N\right)}{\sqrt{1-θ}}\right)\right]^γ\log \frac{3N}ε.\]
Research Software, Software Research, and more
Creators: name: Lamprecht, Anna-Lena
Publisher: name: Zenodo
Year: 2023
Subjects: research software engineering, RSE, research software

description: On September 18, 2023, Anna-Lena Lamprecht from the Institute of Computer Science, University of Potsdam restarted the HiRSE Seminar after the summer break with her talk on Research Software, Software Research, and more. Abstract: In today’s research landscape, research software and Research Software Engineering (RSE) play pivotal roles, and receive increasing recognition within the scientific community. Additionally, there is a growing interest in researching RSE practices themselves, aiming to better understand software development processes in science and enhance them. In this talk I take a closer look at the interconnection of research software, research software engineering, software research, software engineering research, RSE research, an more. I provide an overview of RSE research topics and initiatives, offering insights into this evolving field and presenting opportunities for involvement.
Efficient and accurate modeling of electron photoemission in nanostructures with TDDFT
Creators: name: Wopperer, Philipp
name: De Giovannini, Umberto
name: Rubio, Angel
Publisher: name: arXiv
Year: 2016
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: FOS: Physical sciences

description: We review different computational methods for the calculation of photoelectron spectra and angular distributions of atoms and molecules when excited by laser pulses using time-dependent density-functional theory (TDDFT) that are suitable for the description of electron emission in compact spatial regions. We derive and extend the time-dependent surface-flux method introduced in Reference [Tao L and Scrinzi A 2012 New Journal of Physics 14 013021] within a TDDFT formalism and compare its performance to other existing methods. We illustrate the performance of the new method by simulating strong-field ionization of C$_{60}$ fullerene and discuss final state effects in the orbital reconstruction of planar organic molecules.
description: 25 pages, 6 figures
Formation of new phase inclusions in the system of quasi-equilibrium magnons of high density
Creators: name: Sugakov, V. I.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The paper studies the spatial variation of the magnetization in a nonconducting magnetic sample with an excess number of magnons in comparison to the equilibrium. The phenomenon is considered using the Landau-Lifshits equation with additional terms describing the longitudinal relaxation of the magnetization, the magnon diffusion and the magnon creation by external pumping. The free energy of the system is presented in the mean field approximation. It is shown that, if the pumping exceeds some critical value, regions of the new phase arise where the magnetic moments are oriented opposite to the magnetization of the magnetic sample. The phenomenon is similar to the appearance of droplets of the condensed phase in the supersaturated vapor. The appearance of the new phase either in the form of a single domain or a periodical lattice is demonstrated. The studied process is a competitor to the process of the Bose-Einstein condensation of magnons.
description: 11 pages, 7 figures
Doping-driven Antiferromagnetic Insulator -- Superconductor Transition: a Quantum Monte Carlo Study
Creators: name: Ma, Tianxing
name: Wang, Da
name: Wu, Congjun
Publisher: name: arXiv
Year: 2018
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: How superconductivity emerges in the vicinity of an antiferromagnetic insulating state is a long-standing issue of strong correlation physics. We study the transition from an antiferromagnetic insulator to a superconductor by hole-doping based on a bilayer generalization of a Hubbard-like model. The projector quantum Monte-Carlo simulations are employed, which are sign-problem-free both at and away from half-filling. An anisotropic Ising antiferromagnetic Mott insulating phase occurs at half-filling, which is weakened by hole-doping. Below a critical doping value, antiferromagnetism coexists with the singlet superconductivity, which is a pairing across each rung with an extended $s$-wave symmetry. As further increasing doping, the antiferromagnetic order vanishes, leaving only a superconducting phase. These results provide important information on how superconductivity appears upon doping the parent Mott-insulating state.
description: Somre more data are added and some figures are updated
Stringy horizons and generalized FZZ duality in perturbation theory
Creators: name: Giribet, Gaston
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study scattering amplitudes in two-dimensional string theory on a black hole bakground. We start with a simple derivation of the Fateev-Zamolodchikov-Zamolodchikov (FZZ) duality, which associates correlation functions of the sine-Liouville integrable model on the Riemann sphere to tree-level string amplitudes on the Euclidean two-dimensional black hole. This derivation of FZZ duality is based on perturbation theory, and it relies on a trick originally due to Fateev, which involves duality relations between different Selberg type integrals. This enables us to rewrite the correlation functions of sine-Liouville theory in terms of a special set of correlators in the gauged Wess-Zumino-Witten (WZW) theory, and use this to perform further consistency checks of the recently conjectured Generalized FZZ (GFZZ) duality. In particular, we prove that n-point correlation functions in sine-Liouville theory involving n-2 winding modes actually coincide with the correlation functions in the SL(2,R)/U(1) gauged WZW model that include n-2 oscillator operators of the type described by Giveon, Itzhaki and Kutasov in reference arXiv:1603.05822. This proves the GFZZ duality for the case of tree level maximally winding violating n-point amplitudes with arbitrary $n$. We also comment on the connection between GFZZ and other marginal deformations previously considered in the literature.
description: 19 pages
Fermi Large Area Telescope Detection of Extended Gamma-Ray Emission from the Radio Galaxy Fornax A
Creators: name: LAT Collaboration
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report the Fermi Large Area Telescope detection of extended gamma-ray emission from the lobes of the radio galaxy Fornax A using 6.1 years of Pass 8 data. After Centaurus A, this is now the second example of an extended gamma-ray source attributed to a radio galaxy. Both an extended flat disk morphology and a morphology following the extended radio lobes were preferred over a point-source description, and the core contribution was constrained to be < 14% of the total gamma-ray flux. A preferred alignment of the gamma-ray elongation with the radio lobes was demonstrated by rotating the radio lobes template. We found no significant evidence for variability on ~0.5 year timescales. Taken together, these results strongly suggest a lobe origin for the gamma rays. With the extended nature of the > 100 MeV gamma-ray emission established, we model the source broadband emission considering currently available total lobe radio and millimeter flux measurements, as well as X-ray detections attributed to inverse Compton (IC) emission off the cosmic microwave background (CMB). Unlike the Centaurus A case, we find that a leptonic model involving IC scattering of CMB and extragalactic background light (EBL) photons underpredicts the gamma-ray fluxes by factors of about ~ 2 - 3, depending on the EBL model adopted. An additional gamma-ray spectral component is thus required, and could be due to hadronic emission arising from proton-proton collisions of cosmic rays with thermal plasma within the radio lobes.
description: Accepted for publication in The Astrophysical Journal. --Corresponding authors: J. D. Magill (jmagill_at_umd.edu), W. McConville (wmcconvi_at_umd.edu), M. Georganopoulos (georgano_at_umbc.edu), \L. Stawarz (stawarz_at_oa.uj.edu.pl), C. C. Cheung (Teddy.Cheung@nrl.navy.mil)
title: Health Locus of Control, Sexual Self-Concept, Self-Efficacy and the Contraceptive Behavior of College Students
Creators: name: Perkins, Lorraine Kime
Publisher: name: Old Dominion University Libraries
Year: 1990

description: The purpose of the following study was to determine whether contraceptive use could be predicted from health locus of control, contraceptive self-efficacy, and sexual self-concept scores in a selected group of single college students ages 18-24. In order to better understand contraceptive behaviors, it is desirable to determine which personality variables may influence contraceptive behavior in young adults. A sample of 122 single undergraduate college students, both male and female, ages 18-24, completed a self-reported questionnaire including tools to measure health locus of control, contraceptive self-efficacy, and sexual self-concept, as well as demographic data. The participants were divided into two groups based on the consistency of their self-reported contraceptive use. One research hypothesis was tested. Utilizing Pearson correlations, a significant positive correlation was found between sexual self-concept and contraceptive self-efficacy. The results of multiple regression demonstrated that the consistency of contraceptive use can not be predicted from knowledge of sexual self-concept, contraceptive self-efficacy, and health locus of control scores.
MNE-BIDS: MNE-Python + BIDS = easy dataset interaction
Creators: name: Appelhoff, Stefan
name: Sanderson, Matthew
name: Brooks, Teon L
name: van Vliet, Marijn
name: Quentin, Romain
name: Holdgraf, Chris
name: Chaumon, Maximilien
name: Mikulan, Ezequiel
name: Tavabi, Kambiz
name: Höchenberger, Richard
name: Welke, Dominik
name: Brunner, Clemens
name: Rockhill, Alexander P
name: Larson, Eric
name: Herbst, Sophie K
name: Luke, Robert
name: Li, Adam
name: Gramfort, Alexandre
name: Jas, Mainak
Publisher: name: Zenodo
Year: 2020
Subjects: MNE
Brain Imaging Data Structure
BIDS
open-source
FOSS
neuroinformatics
tools
MEG
EEG
iEEG

description: This is the poster presented at OHBM 2020 about MNE-BIDS, an open-source project within the broader MNE project that aims to organize neurophysiology data according to the BIDS specification. See the "OHBM_2020_MNE-BIDS_references.pdf" file for references and credits.
TOPICS IN ALGEBRAIC SUPERGEOMETRY OVER PROJECTIVE SPACES
Creators: name: NOJA, SIMONE
Publisher: name: Universit� degli Studi di Milano
Year: 2018

description: In questa tesi vengono studiati alcuni argomenti in supergeometria algebrica, con particolare attenzione al caso in cui le variet� ridotte delle supervariet� in esame siano spazi proiettivi complessi $\mathbb{P}^n$. Dopo aver introdotto le definizioni di base e alcune nozioni generali della supergeometria, viene studiata in dettaglio la geometria dei superspazi proiettivi $\mathbb{P}^{n|m}$. In questo contesto, vengono dati risultati sulla struttura e la coomologia dei fasci invertibili, sugli automorfismi e le deformazioni infinitesime. Attenzione speciale � riservata al caso della supercurva di Calabi-Yau $\mathbb{P}^{1|2}$. In seguito, vengono studiate le variet� non-projected su $\mathbb{P}^n$ e se ne fornisce una classificazione nel caso la dimensione dispari sia $2$, mostrando che esistono supervariet� non-projected solamente sulla linea proiettiva $\mathbb{P}^1$ e sul piano proiettivo $\mathbb{P}^2$. In particolare, si dimostra che tutte le supervariet� non-projected su $\mathbb{P}^2$ sono Calabi-Yau, cio� hanno fascio Bereziniano banale, ed inoltre sono non proiettive: non possono cio� essere immerse in un superspazio proiettivo $\mathbb{P}^{n|m}$. Si dimostra, invece, che esse possono sempre essere immerse in super Grassmanniane. In questo contesto, alcune immersioni di supervariet� non-projected significative vengono realizzate esplicitamente. Infine, � data una nuova costruzione dei $\Pi$-spazi proiettivi come supervariet� non-projected connesse al fascio cotangente su $\mathbb{P}^n$.
COVID-19: Molecular Basis of Infection
Creators: name: Vardar-Ulu, Didem
name: Dutta, Shuchismita
Publisher: name: QUBES Educational Resources
Year: 2020

description: This case was written in Spring 2020 during the COVID-19 pandemic. It focuses on understanding the structure and interaction of the SARS-Cov-2 viral spike protein that facilitates infection in human cells.
Convergence of Regularization Parameters for Solutions Using the Filtered Truncated Singular Value Decomposition
Creators: name: Renaut, Rosemary A.
name: Helmstetter, Anthony W.
name: Vatankhah, Saeed
Publisher: name: arXiv
Year: 2018
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65F10

description: The truncated singular value decomposition may be used to find the solution of linear discrete ill-posed problems in conjunction with Tikhonov regularization and requires the estimation of a regularization parameter that balances between the sizes of the fit to data function and the regularization term. The unbiased predictive risk estimator is one suggested method for finding the regularization parameter when the noise in the measurements is normally distributed with known variance. In this paper we provide an algorithm using the unbiased predictive risk estimator that automatically finds both the regularization parameter and the number of terms to use from the singular value decomposition. Underlying the algorithm is a new result that proves that the regularization parameter converges with the number of terms from the singular value decomposition. For the analysis it is sufficient to assume that the discrete Picard condition is satisfied for exact data and that noise completely contaminates the measured data coefficients for a sufficiently large number of terms, dependent on both the noise level and the degree of ill-posedness of the system. A lower bound for the regularization parameter is provided leading to a computationally efficient algorithm. Supporting results are compared with those obtained using the method of generalized cross validation. Simulations for two-dimensional examples verify the theoretical analysis and the effectiveness of the algorithm for increasing noise levels, and demonstrate that the relative reconstruction errors obtained using the truncated singular value decomposition are less than those obtained using the singular value decomposition. This is a pre-print of an article published in BIT Numerical Mathematics. The final authenticated version is available online at: https://doi.org/10.1007%2Fs10543-019-00762-7.
A transition in the spectral statistics of quantum optical model by different electromagnetic fields
Creators: name: Sabri, H.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The effects of the quantized electromagnetic fields on the spectral statistics of two-level atoms are considered. We have used the Berry- Robnik distribution and Maximum Likelihood estimation technique to analyze the effect of mean photon and two level atoms numbers and also the quantum number of considered states. Results suggest the intensity of electromagnetic fields as control parameter which the spectral statistics change due to its variation in the 0-1200 region. Also, we observed the universality in the spectral statistics of considered systems when the number of two level atoms is approached to unrealistic limits and there are some suggestions about the effect of the quantum number of selected levels and the atom-field coupling constant on level statistics.
description: 14 pages, 3 figures. arXiv admin note: substantial text overlap with arXiv:1506.03563
V-type Near-Earth asteroids: dynamics, close encounters and impacts with terrestrial planets
Creators: name: Galiazzo, M. A.
name: Silber, E. A.
name: Bancelin, D.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Asteroids colliding with planets vary in composition and taxonomical type. Among Near-Earth Asteroids (NEAs) are the V-types, basaltic asteroids that are classified via spectroscopic observations. In this work, we study the probability of V-type NEAs colliding with Earth, Mars and Venus, as well as the Moon. We perform a correlational analysis of possible craters produced by V-type NEAs. To achieve this, we performed numerical simulations and statistical analysis of close encounters and impacts between V-type NEAs and the terrestrial planets over the next 10 Myr. We find that V-type NEAs can indeed have impacts with all the planets, the Earth in particular, at an average rate of once per 12 Myr. There are four candidate craters on Earth that were likely caused by V-type NEAs.
description: The article has been accepted by "Astronomical Notes / Astronomische Nachrichten" 2017
Limits of stability in supported graphene nanoribbons subject to bending
Creators: name: Korhonen, Topi
name: Koskinen, Pekka
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Graphene nanoribbons are prone to in-plane bending even when supported on flat substrates. However, the amount of bending that ribbons can stably withstand remains poorly known. Here, by using molecular dynamics simulations, we study the stability limits of 0.5-1.9 nm wide armchair and zigzag graphene nanoribbons subject to bending. We observe that the limits for maximum stable curvatures are below ~10 deg/nm, in case the bending is externally forced and the limit is caused by buckling instability. Furthermore, it turns out that the limits for maximum stable curvatures are also below ~10 deg/nm, in case the bending is not forced and the limit arises only from the corrugated potential energy landscape due to the substrate. Both of the stability limits lower rapidly when ribbons widen. These results agree with recent experiments and can be understood by means of transparent elasticity models.
description: 6 pages, 4 figures
Phases of kinky holographic nuclear matter
Creators: name: Elliot-Ripley, Matthew
name: Sutcliffe, Paul
name: Zamaklar, Marija
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Holographic QCD at finite baryon number density and zero temperature is studied within the five-dimensional Sakai-Sugimoto model. We introduce a new approximation that models a smeared crystal of solitonic baryons by assuming spatial homogeneity to obtain an effective kink theory in the holographic direction. The kink theory correctly reproduces a first order phase transition to lightly bound nuclear matter. As the density is further increased the kink splits into a pair of half-kink constituents, providing a concrete realization of the previously suggested dyonic salt phase, where the bulk soliton splits into constituents at high density. The kink model also captures the phenomenon of baryonic popcorn, in which a first order phase transition generates an additional soliton layer in the holographic direction. We find that this popcorn transition takes place at a density below the dyonic salt phase, making the latter energetically unfavourable. However, the kink model predicts only one pop, rather than the sequence of pops suggested by previous approximations. In the kink model the two layers produced by the single pop form the surface of a soliton bag that increases in size as the baryon chemical potential is increased. The interior of the bag is filled with abelian electric potential and the instanton charge density is localized on the surface of the bag. The soliton bag may provide a holographic description of a quarkyonic phase.
description: 18 pages, 5 figures
IGUG: A MATLAB package for $3$D inversion of gravity data using graph theory
Creators: name: Vatankhah, Saeed
name: Ardestani, Vahid Ebrahimzadeh
name: Niri, Susan Soodmand
name: Renaut, Rosemary Anne
name: Kabirzadeh, Hojjat
Publisher: name: arXiv
Year: 2018
Subjects: subject: Geophysics (physics.geo-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The open source MATLAB package IGUG for 3D inversion of gravity data is presented. It is based on methodology that was introduced by Bijani et al (2015), in which a homogeneous subsurface body is modeled by an ensemble of simple point masses. The model parameters are the Cartesian coordinates of the point masses and their total mass. Associating the point masses to the vertices of a weighted full graph with weights computed by the Euclidean pairwise distances separating vertices, Kruskal's algorithm is used to find the minimum spanning tree of the graph. Stabilization is achieved using an equidistance function that restricts the spatial distribution of the masses and favors a homogeneous subsurface structure. A regularization parameter $λ$ is introduced to balance the two terms of the objective function, and reasonable physically-relevant bound constraints are imposed on the model parameters. Then the bound constrained objective function is solved using a genetic algorithm. A new diagnostic approach is presented for determining a suitable choice for $λ$, requiring a limited number of solutions for a small set of $λ$ without using the L-curve as suggested by Bijani et al. Simulations for synthetic examples demonstrate the efficiency and effectiveness of the implementation of the algorithm. It is verified that the constraints on the model parameters are not restrictive. Included in the package is the script GMD.m which is used for generating synthetic data and for putting measurement data in the format required for the inversion implemented by IGUG.m The script Diagnostic_Results.m is included for analyzing and visualizing the results. The software can be used to verify the simulations and the analysis of real data that is presented here, The real data set uses gravity data from the Mobrun ore body, north east of Noranda, Quebec, Canada.
Nonequilibrium Tuning of the Thermal Casimir Effect
Creators: name: Dean, David S.
name: Lu, Bing-Sui
name: Maggs, A. C.
name: Podgornik, Rudolf
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: In net-neutral systems correlations between charge fluctuations generate strong attractive thermal Casimir forces and engineering these forces to optimize nanodevice performance is an important challenge. We show how the normal and lateral thermal Casimir forces between two plates containing Brownian charges can be modulated by decorrelating the system through the application of an electric field, which generates a nonequilibrium steady state with a constant current in one or both plates, reducing the ensuing fluctuation-generated normal force while at the same time generating a lateral drag force. This hypothesis is confirmed by detailed numerical simulations as well as an analytical approach based on stochastic density functional theory.
description: 7 pages (including Supplementary Material), 2 figures
Architecture of Virtual Power Plant for Ancillary Services
Creators: name: Jibran, Ali
name: Massucco Stefano
name: Federico, Silvestro
Publisher: name: Zenodo
Year: 2018

description: The increased penetration of distributed energy resources opens up issues in power system as a whole. This creates markets opportunities for ancillary services; particularly TSO deals with the issues of congestion management, reserves, reactive power control etc. Literature suggests different techniques where TSO and DSO interact with each other, and in this way, DSO can offer flexibility to TSO in terms of provision of ancillary services. The paper discusses the issues that the current power system face due to the profound effects of new generating resources, and then examines in detail the way these issues are resolved in a conventional manner. Then, the paper discusses some literature proposals for the interaction between TSO-DSO for solving the issues in an efficient manner, and finally presents the architecture where a Virtual Power Plant (VPP) is developed to facilitate DSO with a platform for the provision of ancillary services.
Mapping the orbital structure of impurity bound states in a superconductor
Creators: name: Choi, Deung-Jang
name: Rubio-Verdú, Carmen
name: de Bruijckere, Joeri
name: Ugeda, Miguel Moreno
name: Lorente, Nicolás
name: Pascual, Jose Ignacio
Publisher: name: arXiv
Year: 2016
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A magnetic atomic impurity inside a superconductor locally distorts superconductivity. They scatter Cooper pairs as a potential with broken time-reversal symmetry, what leads to localized bound states with subgap excitation energies, named hereon Shiba states. Most conventional approaches to study Shiba states treat magnetic impurities as point scatterers with an isotropic exchange interaction, while the complex internal structure of magnetic impurities is usually neglected. Here, we show that the number and the shape of Shiba states are correlated to the spin-polarized atomic orbitals of the impurity, hybridized with the superconducting host, as supported by Density Functional Theory simulations. Using high-resolution scanning tunneling spectroscopy, we spatially map the five Shiba excitations found on sub-surface chromium atoms in Pb(111), resolving both their particle and hole components. While the maps of particle components resemble the \textit{d} orbitals of embedded Cr atoms, the hole components differ strongly from them. The orbital fingerprints of Shiba states thus unveil the magnetic ground state of the impurity, and identify scattering channels and interactions, all valuable tools for designing atomic-scale superconducting devices.
description: 5 pages manuscript and 7 pages supplementary information
Auxiliary variables for nonlinear equations with softly broken symmetries
Creators: name: Olum, Ken. D.
name: Masoumi, Ali
Publisher: name: arXiv
Year: 2016
Subjects: subject: Computational Physics (physics.comp-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: General methods of solving equations deal with solving N equations in N variables and the solutions are usually a set of discrete values. However, for problems with a softly broken symmetry these methods often first find a point which would be a solution if the symmetry were exact, and is thus an approximate solution. After this, the solver needs to move in the direction of the symmetry to find the actual solution, but that can be very difficult if this direction is not a straight line in the space of variables. The solution can often be found much more quickly by adding the generators of the softly broken symmetry as auxiliary variables. This makes the number of variables more than the equations and hence there will be a family of solutions, any one of which would be acceptable. In this paper we present a procedure for finding solutions in this case, and apply it to several simple examples and an important problem in the physics of false vacuum decay. We also provide a Mathematica package that implements Powell's hybrid method with the generalization to allow more variables than equations.
description: 14 pages, 6 figures