cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Millennials' Orientations Towards Passion For Work In Knowledge-Based Organisations
Creators: name: Marttinen, Kitte
Publisher: name: University of Westminster
Year: 2022

description: This thesis examines Millennials orientations towards passion for work, when engaging in knowledge-based work in Finnish organisations. To understand the experiences of the participants’ passion for work, this thesis adopted a qualitative and inductive research approach with the aim of hearing the own voices of the participants at work using multiple data sources. The study provides a new typology of passion for work orientations. It also adds to the understanding of the antecedents of passion for work by explaining how they are experienced and articulated by young employees as well as how their various identity constructs inform the identified orientations. The analysis revealed four orientations towards passion for work, namely boundaryless, expert, belonger and bystander. It also revealed four themes that characterise the antecedents of passion for work, that is, relating autonomously to one’s work, having a sense of professional value, relating to co-workers and the work community, and having supportive supervisor and leadership relations. An integrated literature review was performed to identify the theoretical foundations of the study and determine the critical question to be addressed. It also informed the choice of a qualitative inquiry and a social constructionist paradigm. The utilised data consisted of two sets of semi-structured interviews (52 altogether) augmented by a novel WhatsApp diary approach (181 text or voice messages and 44 photos or short videos). The study was conducted among 26 Millennials (young people born in the 1980s and 1990s) employed by four organisations in Finland. The findings extend the established passion theories with a new typology of four different orientations, which provides insights into how young employees act and react, in addition to what they need from their organisations, supervisors and leaders, when they exhibit a specific orientation. In addition, the findings reveal that experiences of the enablers of passion for work within organisations are highly personal and contextual. The results also emphasize the significance of meaningful work and psychological safety at work. Moreover, findings highlight the importance of good relationships as well as attentive and mindful communication within organisations, especially those experienced during everyday moments, sometimes micro-moments, which sometimes lead to tipping points in terms of passion for work.
When anxiety matters as a condition of possibility: about student-teachers’ anxiety experiences towards becoming a teacher
Creators: name: Helleve, Mette
name: Æsøy, Knut Ove
Publisher: name: Encyclopaideia
Year: 2021

description: The purpose of this study is to explore the emotional dimension of the student-teachers’ experiences, which is marked by anxiety. This study is based on a combination of a phenomenological informed theoretical framework and a phenomenographic approach. The empirical material refers to in-depth interviews with student-teachers. Through an abductive analysis of the material, anxiety experiences appeared to be a significant matter in the student teachers’ emotional life. Our study showed that anxiety in different variations to a large extent characterized the emotional dimension of the student teachers’ experiences. The variations were expressed through three overarching categories of anxiety. The first category of anxiety is about losing one’s dignity, the second about not being recognized as a person, and the third about doing something very wrong. To operationalize the purpose of this study, we will discuss the importance of considering anxiety experiences as a didactical content component in teacher education.
description: Encyclopaideia, Vol. 25 No. 60 (2021)
Plasmons and screening in a monolayer of MoS$_2$
Creators: name: Scholz, Andreas
name: Stauber, Tobias
name: Schliemann, John
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate the dynamical dielectric function of a monolayer of molybdenum disulfide within the random phase approximation. While in graphene damping of plasmons is caused by interband transitions, due to the large direct band gap in monolayer MoS$_2$ collective charge excitations enter the intraband electron hole continuum similar to the situation in two-dimensional electron and hole gases. Since there is no electron-hole symmetry in MoS$_2$, the plasmon energies in p- and n-doped samples clearly differ. The breaking of spin degeneracy caused by the large intrinsic spin-orbit interaction leads to a beating of Friedel oscillations for sufficiently large carrier concentrations, for holes as well as for electrons.
description: 7 pages, 8 figures; typos corrected
Wormholes Threaded by Chiral Fields
Creators: name: Charalampidis, Efstathios
name: Ioannidou, Theodora
name: Kleihaus, Burkhard
name: Kunz, Jutta
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider Lorentzian wormholes with a phantom field and chiral matter fields. The chiral fields are described by the non-linear sigma model with or without a Skyrme term. When the gravitational coupling of the chiral fields is increased, the wormhole geometry changes. The single throat is replaced by a double throat with a belly inbetween. For a maximal value of the coupling, the radii of both throats reach zero. Then the interior part pinches off, leaving a closed universe and two (asymptotically) flat spaces. A stability analysis shows that all wormholes threaded by chiral fields inherit the instability of the Ellis wormhole.
description: 14 pages, 9 figures
Universality Aspects of Layering Transitions in Ferromagnetic Blume-Capel Thin Films
Creators: name: Yuksel, Yusuf
name: Akinci, Umit
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Critical phenomena and universality behavior of ferromagnetic thin films described by a spin-1 Blume-Capel Hamiltonian has been examined for various thickness values ranging from 3 to 40 layers. Using effective field theory, we have found that crystal field interactions significantly affects the critical value of surface to bulk ratio of exchange interactions $R_{c}$ at which the critical temperature becomes independent of film thickness $L$. Moreover, we have extracted the shift exponent $λ$ from computed data. Based on the results, we have shown that in the presence of surface exchange enhancement, the system may exhibit a dimensional crossover. We have also found that presence of crystal field interactions does not affect the value of $λ$. Hence, a ferromagnetic spin-1/2 thin film is in the same universality class with its spin-1 counterpart.
description: 14 pages, 5 figures
Cavity Optomechanics of Levitated Nano-Dumbbells: Non-Equilibrium Phases and Self-Assembly
Creators: name: Lechner, W.
name: Habraken, S. J. M.
name: Kiesel, N.
name: Aspelmeyer, M.
name: Zoller, P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Levitated nanospheres in optical cavities open a novel route to study many-body systems out of solution and highly isolated from the environment. We show that properly tuned optical parameters allow for the study of the non-equilibrium dynamics of composite nano-particles with non-isotropic optical friction. We find friction induced ordering and nematic transitions with non-equilibrium analogs to liquid crystal phases for ensembles of dimers.
Detectability of High-Redshift Superluminous Supernovae with Upcoming Optical and Near-Infrared Surveys - II. Beyond z=6
Creators: name: Tanaka, Masaomi
name: Moriya, Takashi J.
name: Yoshida, Naoki
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Observational identification of the first stars is one of the great challenges in the modern astronomy. Although a single first star is too faint to be detected, supernova explosions of the first stars can be bright enough. An important question is whether such supernovae can be detected in the limited observational area with realistic observational resources. We perform detailed simulations to study the detectability of superluminous supernovae (SLSNe) at high redshifts, using the observationally-calibrated star formation rate density and supernova occurrence rate. We show that a 100 deg^2 survey with the limiting magnitude of 26 mag in near-infrared wavelengths will be able to discover about 10 SLSNe at z > 10. If the survey is extended to 200 deg^2 with 27 mag depth, about 10 SLSNe can be discovered at z > 15. We emphasize that the observations at > 3 um are crucial to detect and select SLSNe at z > 10. Our simulations are also applied to the planned survey with Euclid, WFIRST, and WISH. These surveys will be able to detect about 1000, 400, and 3000 SLSNe up to z ~ 5, 7, and 12, respectively. We conclude that detection of SLSNe at z > 10 is in fact achievable in the near future.
description: 12 pages, 13 figures, accepted for publication in MNRAS
Breathing Pyrochlore Lattice Realized in A-Site Ordered Spinel Oxides LiGaCr4O8 and LiInCr4O8
Creators: name: Okamoto, Yoshihiko
name: Nilsen, Gøran J.
name: Attfield, J. Paul
name: Hiroi, Zenji
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A unique type of frustrated lattice is found in two A-site ordered spinel oxides, LiGaCr4O8 and LiInCr4O8. Because of the large size mismatch between Li+ and Ga3+/In3+ ions at the A site, the pyrochlore lattice, made up of Cr3+ ions carrying spin 3/2, becomes an alternating array of small and large tetrahedra, i.e., a "breathing" pyrochlore lattice. We introduce a parameter, the breathing factor Bf, which quantifies the degree of frustration in the pyrochlore lattice: Bf is defined as J'/J, where J' and J are nearest-neighbor magnetic interactions in the large and small tetrahedra, respectively. LiGaCr4O8 with Bf ~ 0.6 shows magnetic susceptibility similar to that of conventional Cr spinel oxides such as ZnCr2O4. In contrast, LiInCr4O8 with a small Bf ~ 0.1 exhibits a spin-gap behavior in its magnetic susceptibility, suggesting a proximity to an exotic singlet ground state. Magnetic long-range order occurs at 13.8 and 15.9 K for LiGaCr4O8 and LiInCr4O8, respectively, in both cases likely owing to the coupling to structural distortions.
description: 5 pages, 5 figures, accepted for publication in Phys. Rev. Lett
Integration of PDEs by differential geometric means
Creators: name: Tehseen, Naghmana
name: Prince, Geoff
Publisher: name: arXiv
Year: 2013
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 58A10, 58A15, 58A17

description: We use Vessiot theory and exterior calculus to solve partial differential equations(PDEs) of the type uyy = F(x, y,u,ux,uy,uxx,uxy) and associated evolution equations. These equations are represented by the Vessiot distribution of vector fields. We develop and apply an algorithm to find the largest integrable sub-distributions and hence solutions of the PDEs. We then apply the integrating factor technique [19] to integrate this integrable Vessiot sub-distribution. The method is successfully applied to a large class of linear and non-linear PDEs.
The Interstellar Bubbles of G38.9-0.4 and the Impact of Stellar Feedback on Star Formation
Creators: name: Alexander, Michael J.
name: Kobulnicky, Henry A.
name: Kerton, Charles R.
name: Arvidsson, Kim
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a study of the star formation (SF) region G38.9-0.4 using publicly available multiwavelength Galactic Plane surveys from ground- and space-based observatories. This region is composed of four bright mid-IR bubbles and numerous infrared dark clouds. Two bubbles, N 74 and N 75, each host a star cluster anchored by a single O9.5V star. We identified 162 young stellar objects (YSOs) and classify 54 as stage I, 7 stage II, 6 stage III, and 32 ambiguous. We do not detect the classical signposts of triggered SF, i.e., star-forming pillars or YSOs embedded within bubble rims. We conclude that feedback-triggered SF has not occurred in G38.9-0.4. The YSOs are preferentially coincident with infrared dark clouds. This leads to a strong correlation between areal YSO mass surface density and gas mass surface density with a power law slope near 1.3, which closely matches the Schmidt-Kennicutt Law. The correlation is similar inside and outside the bubbles and may mean that the SF efficiency is neither enhanced nor supressed in regions potentially influenced by stellar feedback. This suggests that gas density, regardless of how it is collected, is a more important driver of SF than stellar feedback. Larger studies should be able to quantify the fraction of all SF that is feedback-triggered by determining the fraction SF, feedback-compressed gas surrounding HII regions relative to that already present in molecular clouds.
description: Accepted for publication in ApJ. 56 pages, 18 figures
ESSAYS ON GLOBALISATION: EFFECTS AND IMPLICATIONS FOR INDIVIDUALS
Creators: name: PIRIU, ANDREEA ALEXANDRA
Publisher: name: Universit� degli Studi di Milano
Year: 2020

description: This thesis studies the effects of import competition from China and Eastern Europe on the health and fertility decisions of German individuals working in manufacturing. Individuals are matched with separate measures of exposure to competition from China and Eastern Europe, respectively. To isolate exogenous supply shocks from the origin, instrumental variables for competition from each of China and Eastern Europe are constructed. Results in Chapter 1 suggest that higher import competition worsens individual health via job displacement, wage decline, shortened employment duration, increased reliance on welfare and less future orientation, with Chinese import competition affecting individuals twice as much. Health declines as individuals increase their visits to the doctor, exercise less frequently and have a higher probability of developing chronic illness. Also, there is some evidence that individuals do not tend to become disabled but may be slowly pushed into chronic illness. Findings in Chapter 2 show that import competition negatively affects the individual?s probability of having children via reduced earnings, lower satisfaction with personal income and shortened employment duration. The chapter then investigates effects of import exposure by gender. Results show that male and female fertility choices differ upon rising import competition. Higher import exposure lowers female earnings and job autonomy, which in turn generates a lower opportunity cost of work, to the point where having children would become a more rewarding alternative for female workers. By contrast, increased import exposure negatively affects male workers? fertility through reduced earnings and employment duration.
Shishkin mesh simulation: A new stabilization technique for convection-diffusion problems and complementary experiments
Creators: name: García-Archilla, Bosco
Publisher: name: arXiv
Year: 2012
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: We present together in this document the paper B. García-Archilla, Shiskin mesh simulation: A new stabilization technique for convection-diffusion problems, Comput. Methods Appl. Mech. Engrg., 256 (2013), 1-16, and the manuscript B. Garc\'ıa-Archilla, Shiskin mesh simulation: Complementary experiments, which contains some of the experiments that, for the sake of brevity were not included in the first one. This second paper with complementary experiments is neither self-contained nor intended to be published in any major journal, but is intended to be accessible to anyone wishing to learn more on theperformance of the SMS method. Following a principle of reproducible computational research, the source codes of the experiments in the present papers are available from the author on request or on "http://personal.us.es/bga/bga_files/software_bga.html". Excluded are the codes corresponding to Example 7 which is subject of current resarch
description: 46 pages, 34 figures
Formation of the frozen core in critical Boolean Networks
Creators: name: Möller, Marco
name: Drossel, Barbara
Publisher: name: arXiv
Year: 2013
Subjects: subject: Molecular Networks (q-bio.MN)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: We investigate numerically and analytically the formation of the frozen core in critical random Boolean networks with biased functions. We demonstrate that a previously used efficient algorithm for obtaining the frozen core, which starts from the nodes with constant functions, fails when the number of inputs per node exceeds 4. We present computer simulation data for the process of formation of the frozen core and its robustness, and we show that several important features of the data can be derived by using a mean-field calculation.
Comparison of density functionals for nitrogen impurities in ZnO
Creators: name: Sakong, Sung
name: Gutjahr, Johann
name: Kratzer, Peter
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Hybrid functionals and empirical correction schemes are compared to conventional semi-local density functional theory (DFT) calculations in order to assess the predictive power of these methods concerning the formation energy and the charge transfer level of impurities in the wide-gap semiconductor ZnO. While the generalized gradient approximation fails to describe the electronic structure of the N impurity in ZnO correctly, methods that widen the band gap of ZnO by introducing additional non-local potentials yield the formation energy and charge transfer level of the impurity in reasonable agreement with hybrid functional calculations. Summarizing the results obtained with different methods, we corroborate earlier findings that the formation of substitutional N impurities at the oxygen site in ZnO from N atoms is most likely slightly endothermic under oxygen-rich preparation conditions, and introduces a deep level more than 1eV above the valence band edge of ZnO. Moreover, the comparison of methods elucidates subtle differences in the predicted electronic structure, e.g. concerning the orientation of unoccupied orbitals in the crystal field and the stability of the charged triplet state of the N impurity. Further experimental or theoretical analysis of these features could provide useful tests for validating the performance of DFT methods in their application to defects in wide-gap materials.
description: 9 pages, 4 figures
Metals in the IGM approaching the re-ionization epoch: results from X-shooter at the VLT
Creators: name: D'Odorico, V.
name: Cupani, G.
name: Cristiani, S.
name: Maiolino, R.
name: Molaro, P.
name: Nonino, M.
name: Centurión, M.
name: Cimatti, A.
name: Alighieri, S. di Serego
name: Fiore, F.
name: Fontana, A.
name: Gallerani, S.
name: Giallongo, E.
name: Mannucci, F.
name: Marconi, A.
name: Pentericci, L.
name: Viel, M.
name: Vladilo, G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present the results of observations taken with the X-shooter spectrograph devoted to the study of quasars at z ~ 6. This paper focuses on the properties of metals at high redshift traced, in particular, by the C IV doublet absorption systems. Six objects were observed with resolutions ~27 and 34 km/s in the visual, and 37.5 and 53.5 km/s in the near infrared. We detected 102 C IV lines in the range: 4.35 < z < 6.2 of which 27 are above z ~ 5. Thanks to the characteristics of resolution and spectral coverage of X-shooter, we could also detect 25 Si IV doublets associated with the C IV at z>5. The column density distribution function of the C IV line sample is observed to evolve in redshift for z>~ 5.3, with respect to the normalization defined by low redshift (1.5 < z <4) C IV lines. This behaviour is reflected in the redshift evolution of the C IV cosmic mass density, Omega_CIV, of lines with column density in the range 13.4 < log N(C IV) < 15, which is consistent with a drop of a factor of ~2 for z>~ 5.3. Considering only the stronger C IV lines (13.8 < log N(CIV) < 15), Omega_CIV gently rises by a factor of ~10 between z ~ 6.2 and z~ 1.5 with a possible flattening toward z ~ 0. The increase is well fitted by a power law: Omega_CIV = (2+-1)x10^{-8} [(1+z)/4]^{-3.1+-0.1}. An insight into the properties of the C IV absorbers and their evolution with redshift is obtained by comparing the observed column densities of associated C IV, Si IV and C II absorptions with the output of a set of CLOUDY photo-ionization models. As already claimed by cosmological simulations, we find that C IV is a good tracer of the metallicity in the low-density intergalacitc medium gas at z ~ 5-6 while at z ~ 3 it arises in gas with over density delta ~100.
description: Accepted for publication in MNRAS. Minor changes with respect to previous version (typos, references)
title: Festigkeitsbeurteilung des Wagenkastens der U-Bahn Wien
Creators: name: Mantl, Michael
Publisher: name: TU Wien
Year: 2022
Subjects: subject: Festigkeitsnachweis
subject: Schienenfahrzeug
subject: Betriebsfestigkeit
subject: Dauerfestigkeit
subject: Ermüdungsfestigkeitsnachweis
subject: statischer Nachweis
subject: Metro
subject: U-Bahn
subject: Festigkeitsberechnung
subject: demonstration of strength
subject: railway vehicle
subject: cumulative damage approach
subject: endurance limit approach
subject: demonstration of fatigue strength
subject: demonstration of static strength
subject: metro
subject: strength calculation

description: Arbeit an der Bibliothek noch nicht eingelangt - Daten nicht geprueft - gesperrte Arbeit (bis 2024-12-14+01:00)
description: Abweichender Titel nach Übersetzung der Verfasserin/des Verfassers
Monitoring the formation of oxide apertures in micropillar cavities
Creators: name: Bakker, Morten P.
name: Snijders, Henk
name: Suntrup, Donald J.
name: Truong, Tuan-Ahn
name: Petroff, Pierre M.
name: van Exter, Martin P.
name: Bouwmeester, Dirk
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: An imaging technique is presented that enables monitoring of the wet thermal oxidation of a thin AlAs layer embedded between two distributed Bragg reflector (DBR) mirrors in a micropillar. After oxidation we confirm by white light reflection spectroscopy that high quality optical modes confined to a small volume have been formed. The combination of these two optical techniques provides a reliable and efficient way of producing oxide apertured micropillar cavities for which the wet thermal oxidation is a critical fabrication step.
Correlators in the Simplest Gauge-String Duality
Creators: name: Gopakumar, Rajesh
name: Pius, Roji
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this note we compare planar correlators such as $< \prod_i^n Tr M^{2k_i} >$ in the Gaussian matrix model with corresponding genus zero correlators of the A-model topological string theory on $P^1$. We find a simple relation between them which provides additional evidence for the duality between the two theories, as proposed in arXiv:1104.2386.
description: 21 pages; v2. references and comments added
Extending resolution within a single imaging frame.
Creators: name: Torres-García, Esley
name: Pinto-Cámara, Raúl
name: Linares, Alejandro
name: Martínez, Damián
name: Abonza, Víctor
name: Brito-Alarcón, Eduardo
name: Calcines-Cruz, Carlos
name: Valdés-Galindo, Gustavo
name: Torres, David
name: Jabloñski, Martina
name: Torres-Martínez, Héctor H
name: Martínez, José L
name: Hernández, Haydee O
name: Ocelotl-Oviedo, José P
name: Garcés, Yasel
name: Barchi, Marco
name: D'Antuono, Rocco
name: Bošković, Ana
name: Dubrovsky, Joseph G
name: Darszon, Alberto
name: Buffone, Mariano G
name: Morales, Roberto Rodríguez
name: Rendon-Mancha, Juan Manuel
name: Wood, Christopher D
name: Hernández-García, Armando
name: Krapf, Diego
name: Crevenna, Álvaro H
name: Guerrero, Adán
Publisher: name: The Francis Crick Institute
Year: 2022
Subjects: Imaging

description: The resolution of fluorescence microscopy images is limited by the physical properties of light. In the last decade, numerous super-resolution microscopy (SRM) approaches have been proposed to deal with such hindrance. Here we present Mean-Shift Super Resolution (MSSR), a new SRM algorithm based on the Mean Shift theory, which extends spatial resolution of single fluorescence images beyond the diffraction limit of light. MSSR works on low and high fluorophore densities, is not limited by the architecture of the optical setup and is applicable to single images as well as temporal series. The theoretical limit of spatial resolution, based on optimized real-world imaging conditions and analysis of temporal image stacks, has been measured to be 40 nm. Furthermore, MSSR has denoising capabilities that outperform other SRM approaches. Along with its wide accessibility, MSSR is a powerful, flexible, and generic tool for multidimensional and live cell imaging applications.
Scalable, Non-Invasive Glucose Sensor Based on Boronic Acid Functionalized Carbon Nanotube Transistors
Creators: name: Lerner, Mitchell B.
name: Kybert, Nicholas
name: Mendoza, Ryan
name: Villechenon, Romain
name: Lopez, Manuel A. Bonilla
name: Johnson, A. T. Charlie
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Biological Physics (physics.bio-ph)
subject: Chemical Physics (physics.chem-ph)
subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: We developed a scalable, label-free all-electronic sensor for D-glucose based on a carbon nanotube transistor functionalized with pyrene-1-boronic acid. This sensor responds to glucose in the range 1 uM - 100 mM, which includes typical glucose concentrations in human blood and saliva. Control experiments establish that functionalization with the boronic acid provides high sensitivity and selectivity for glucose. The devices show better sensitivity than commercial blood glucose meters and could represent a general strategy to bloodless glucose monitoring by detecting low concentrations of glucose in saliva.
description: 8 pages, 4 figures, to appear in Applied Physics Letters
Geometric Engineering in Toric F-Theory and GUTs with U(1) Gauge Factors
Creators: name: Braun, Volker
name: Grimm, Thomas W.
name: Keitel, Jan
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: An algorithm to systematically construct all Calabi-Yau elliptic fibrations realized as hypersurfaces in a toric ambient space for a given base and gauge group is described. This general method is applied to the particular question of constructing SU(5) GUTs with multiple U(1) gauge factors. The basic data consists of a top over each toric divisor in the base together with compactification data giving the embedding into a reflexive polytope. The allowed choices of compactification data are integral points in an auxiliary polytope. In order to ensure the existence of a low-energy gauge theory, the elliptic fibration must be flat, which is reformulated into conditions on the top and its embedding. In particular, flatness of SU(5) fourfolds imposes additional linear constraints on the auxiliary polytope of compactifications, and is therefore non-generic. Abelian gauge symmetries arising in toric F-theory compactifications are studied systematically. Associated to each top, the toric Mordell-Weil group determining the minimal number of U(1) factors is computed. Furthermore, all SU(5)-tops and their splitting types are determined and used to infer the pattern of U(1) matter charges.
description: 34 pages, 8 figures, 6 tables; v2: references added, improved U(1) scan
Data Storage: Review of Heusler Compounds
Creators: name: Bai, Zhaoqiang
name: Shen, Lei
name: Han, Guchang
name: Feng, Yuan ping
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In the recent decade, the family of Heusler compounds has attracted tremendous scientific and technological interest in the field of spintronics. This is essentially due to their exceptional magnetic properties, which qualify them as promising functional materials in various data-storage devices, such as giant-magnetoresistance spin valves, magnetic tunnel junctions, and spin-transfer torque devices. In this article, we provide a comprehensive review on the applications of the Heusler family in magnetic data storage. In addition to their important roles in the performance improvement of these devices, we also try to point out the challenges as well as possible solutions, of the current Heusler-based devices. We hope that this review would spark further investigation efforts into efficient incorporation of this eminent family of materials into data storage applications by fully arousing their intrinsic potential.
description: invited review paper by the Journal of SPIN
Observations of intensity fluctuations attributed to granulation and faculae on Sun-like stars from the Kepler mission
Creators: name: Karoff, C.
name: Campante, T. L.
name: Ballot, J.
name: Kallinger, T.
name: Gruberbauer, M.
name: Garcia, R. A.
name: Caldwell, D. A.
name: Christiansen, J. L.
name: Kinemuchi, K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Sun-like stars show intensity fluctuations on a number of time scales due to various physical phenomena on their surfaces. These phenomena can convincingly be studied in the frequency spectra of these stars - while the strongest signatures usually originate from spots, granulation and p-mode oscillations, it has also been suggested that the frequency spectrum of the Sun contains a signature of faculae. We have analyzed three stars observed for 13 months in short cadence (58.84 seconds sampling) by the Kepler mission. The frequency spectra of all three stars, as for the Sun, contain signatures that we can attribute to granulation, faculae, and p-mode oscillations. The temporal variability of the signatures attributed to granulation, faculae and p-mode oscillations were analyzed and the analysis indicates a periodic variability in the granulation and faculae signatures - comparable to what is seen in the Sun.
description: accepted for publication in ApJ
Dispersive and soliton perturbations of finite-genus solutions of the KdV equation: computational results
Creators: name: Trogdon, Thomas
name: Deconinck, Bernard
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: Numerical Analysis (math.NA)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 35Q15, 35Q53, 65M70, 30F99

description: All solutions of the Korteweg -- de Vries equation that are bounded on the real line are physically relevant, depending on the application area of interest. Usually, both analytical and numerical approaches consider solution profiles that are either spatially localized or (quasi)periodic. In this paper, we discuss a class of solutions that is a nonlinear superposition of these two cases: their asymptotic state for large $|x|$ is (quasi)periodic, but they may contain solitons, with or without dispersive tails. Such scenarios might occur in the case of localized perturbations of previously present sea swell, for instance. Such solutions have been discussed from an analytical point of view only recently. We numerically demonstrate different features of these solutions.
The Challenges of Archiving Experimental and Practice-Based Scholarly Works
Creators: name: Cole, Gareth
name: Barnes, Miranda
Publisher: name: Zenodo
Year: 2025

description: This poster was presented at the Born-Digital Collections, Archives and Memory conference, on 2-4 Apr 2025.

Abstract: We have been investigating the archiving of open access books as part of a funded project. We have recently extended our work into the archiving of PhD theses. A complementary work package on the project has also been exploring the publishing of experimental books. This paper will explore the challenges we have identified in archiving experimental works as well as practice-based PhD theses.

Although not necessarily seen as related, both of these types of work are usually not of the “traditional” textual nature. This means that the questions raised around archiving them can actually be seen as related and pose similar challenges to the archiving body.

Questions we will be examining as part of the project include:

What are the existing workflows and processes for archiving this type of material?

What are the gaps in the current workflows impacting this type of material?

 How ready are Institutional Repositories for this type of material? Are there differences between specialist institutions and more broad-based institutions?

Are PhD theses more broadly archived and, if so, how? E-theses are considered as part of the “Published Research Papers” in the DPC Bitlist and marked as “Vulnerable”: https://www.dpconline.org/digipres/champion-digital-preservation/bit-list/vulnerable/bitlist-published-research-papers

This paper will outline our research findings in these areas highlighting individual and institutional challenges and suggest initial recommendations for how these types of material can be successfully archived by institutions.
description: The Open Book Futures project is co-funded by Arcadia and Research England Development (RED) Fund (UKRI). Arcadia is a charitable foundation that works to protect nature, preserve cultural heritage and promote open access to knowledge. Since 2002 Arcadia has awarded more than $1 billion to organizations around the world. Research England Development (RED) Fund (UKRI) is a fund supporting institutional-level innovative projects in research and knowledge exchange including collaborations between education providers and between education providers and business.
microbeSEG models
Creators: name: Scherr, Tim
name: Seiffarth, Johannes
name: Wollenhaupt, Bastian
name: Neumann, Oliver
name: Kohlheyer, Dietrich
name: Scharr, Hanno
name: Nöh, Katharina
name: Mikut, Ralf
Publisher: name: Zenodo
Year: 2022
Subjects: cell segmentation
microbeSEG
nucleus segmentation
deep learning
omero

description: Trained models that can be used for the software microbeSEG. The models were trained on a dataset consisting of 826 320x320 px crops extracted from the Omnipose dataset (bact_fluor train, bact_phase train), the microbeSEG dataset, and the Cell Tracking Challenge datasets BF-C2DL-HSC, BF-C2DL-MuSC, Fluo-N2DL-HeLa, and PhC-C2DL-PSC. The training dataset is also provided. Mean AJI+ scores on a test dataset with 32 320x320 px crops:
 - boundary_model_adam: 0.769
 - boundary_model_ranger: 0.783
 - distance_model_adam: 0.802
 - distance_model_ranger: 0.835 When using these models, please cite (and check if pre-prints have meanwhile been published in a journal/conference):
 - microbeSEG,
 - our method,
 - Omnipose,
 - the latest Cell Tracking Challenge publication: current paper. Omnipose data license: www.cellpose.org/dataset_omnipose Usage Just download all files into the directory published in the microbeSEG repository. The models can then be selected in the graphical user interface of microbeSEG.
Multiple CP Non-conserving Mechanisms of $\betabeta$-Decay and Nuclei with Largely Different Nuclear Matrix Elements
Creators: name: Meroni, A.
name: Petcov, S. T.
name: Simkovic, F.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the possibility to discriminate between different pairs of CP non-conserving mechanisms inducing the neutrinoless double beta $\betabeta$-decay by using data on $\betabeta$-decay half-lives of nuclei with largely different nuclear matrix elements (NMEs). The mechanisms studied are: light Majorana neutrino exchange, heavy left-handed (LH) and heavy right-handed (RH) Majorana neutrino exchanges, lepton charge non-conserving couplings in SUSY theories with R-parity breaking giving rise to the "dominant gluino exchange" and the "squark-neutrino" mechanisms. The nuclei considered are $^{76}$Ge, $^{82}$Se, $^{100}$Mo, $^{130}$Te and $^{136}$Xe. Four sets of nuclear matrix elements (NMEs) of the decays of these five nuclei, derived within the Self-consistent Renormalized Quasiparticle Random Phase Approximation (SRQRPA), were employed in our analysis. While for each of the five single mechanisms discussed, the NMEs for $^{76}$Ge, $^{82}$Se, $^{100}$Mo and $^{130}$Te differ relatively little, the relative difference between the NMEs of any two nuclei not exceeding 10%, the NMEs for $^{136}Xe$ differ significantly from those of $^{76}$Ge, $^{82}Se$, $^{100}$Mo and $^{130}$Te, being by a factor $\sim (1.3 - 2.5)$ smaller. This allows, in principle, to draw conclusions about the pair of non-interfering (interfering) mechanisms possibly inducing the $\betabeta$-decay from data on the half-lives of $^{136}Xe$ and of at least one (two) more isotope(s) which can be, e.g., any of the four, $^{76}Ge$, $^{82}Se$, $^{100}Mo$ and $^{130}Te$. Depending on the sets of mechanisms considered, the conclusion can be independent of, or can depend on, the NMEs used in the analysis. The implications of the EXO lower bound on the half-life of $^{136}Xe$ for the problem studied are also exploited.
description: Version to be published in JHEP. 28 pages, 13 figures, 6 tables, references added. arXiv admin note: text overlap with arXiv:1103.2434
A flat band at the chemical potential of a Fe1.03Te0.94S0.06 superconductor observed by angle-resolved photoemission spectroscopy
Creators: name: Starowicz, P.
name: Schwab, H.
name: Goraus, J.
name: Zajdel, P.
name: Forster, F.
name: Rak, J. R.
name: Green, M. A.
name: Vobornik, I.
name: Reinert, F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The electronic structure of superconducting Fe1.03Te0.94S0.06 has been studied by angle resolved photoemission spectroscopy (ARPES). Experimental band topography is compared to the calculations using the methods of Korringa-Kohn-Rostoker (KKR) with coherent potential approximation (CPA) and linearized augmented plane wave with local orbitals (LAPW+LO). The region of the Gamma point exhibits two hole pockets and a quasiparticle peak close to the chemical potential with undetectable dispersion. This flat band with mainly dz2 orbital character is formed most likely by the top of the outer hole pocket or is an evidence of the third hole band. It may cover up to 3 % of the Brillouin zone volume and should give rise to a Van Hove singularity. Studies performed for various photon energies indicate that at least one of the hole pockets has a two-dimensional character. The apparently nondispersing peak at the chemical potential is clearly visible for 40 eV and higher photon energies, due to an effect of photoionisation cross section rather than band dimensionality. Orbital characters calculated by LAPW+LO for stoichiometric FeTe do not reveal the flat dz2 band but are in agreement with the experiment for the other dispersions around Gamma in Fe1.03Te0.94S0.06.
description: 14 pages, 6 figures
Black branes in flux compactifications
Creators: name: Torroba, Gonzalo
name: Wang, Huajia
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct charged black branes in type IIA flux compactifications that are dual to (2+1)-dimensional field theories at finite density. The internal space is a general Calabi-Yau manifold with fluxes, with internal dimensions much smaller than the AdS radius. Gauge fields descend from the 3-form RR potential evaluated on harmonic forms of the Calabi-Yau, and Kaluza-Klein modes decouple. Black branes are described by a four-dimensional effective field theory that includes only a few light fields and is valid over a parametrically large range of scales. This effective theory determines the low energy dynamics, stability and thermodynamic properties. Tools from flux compactifications are also used to construct holographic CFTs with no relevant scalar operators, that can lead to symmetric phases of condensed matter systems stable to very low temperatures. The general formalism is illustrated with simple examples such as toroidal compactifications and manifolds with a single size modulus. We initiate the classification of holographic phases of matter described by flux compactifications, which include generalized Reissner-Nordstrom branes, nonsupersymmetric $AdS_2 \times R^2$ and hyperscaling violating solutions.
description: 37 pages, 2 figures, typos corrected and comments added
Magnetically Controlled Accretion on the Classical T Tauri Stars GQ Lupi and TW Hydrae
Creators: name: Johns-Krull, C. M.
name: Chen, W.
name: Valenti, J. A.
name: Jeffers, S. V.
name: Piskunov, N. E.
name: Kuchukhov, O.
name: Makaganiuk, V.
name: Stempels, H. C.
name: Snik, F.
name: Keller, C.
name: Rodenhuis, M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present high spectral resolution ($R\approx108,000$) Stokes $V$ polarimetry of the Classical T Tauri stars (CTTSs) GQ Lup and TW Hya obtained with the polarimetric upgrade to the HARPS spectrometer on the ESO 3.6 m telescope. We present data on both photospheric lines and emission lines, concentrating our discussion on the polarization properties of the \ion{He}{1} emission lines at 5876 Å and 6678 Å. The \ion{He}{1} lines in these CTTSs contain both narrow emission cores, believed to come from near the accretion shock region on these stars, and broad emission components which may come from either a wind or the large scale magnetospheric accretion flow. We detect strong polarization in the narrow component of the two \ion{He}{1} emission lines in both stars. We observe a maximum implied field strength of $6.05 \pm 0.24$ kG in the 5876 Å line of GQ Lup, making it the star with the highest field strength measured in this line for a CTTS. We find field strengths in the two \ion{He}{1} lines that are consistent with each other, in contrast to what has been reported in the literature on at least one star. We do not detect any polarization in the broad component of the \ion{He}{1} lines on these stars, strengthening the conclusion that they form over a substantially different volume relative the formation region of the narrow component of the \ion{He}{1} lines.
description: 17 pages, 4 figures, Accepted to The Astrophysical Journal
Spin-cube Models of Quantum Gravity
Creators: name: Mikovic, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the state-sum models of quantum gravity based on a representation 2-category of the Poincare 2-group. We call them spin-cube models, since they are categorical generalizations of spin-foam models. A spin-cube state sum can be considered as a path integral for a constrained 2-BF theory, and depending on how the constraints are imposed, a spin-cube state sum can be reduced to a path integral for the area-Regge model with the edge-length constraints, or to a path integral for the Regge model. We also show that the effective actions for these spin-cube models have the correct classical limit.
description: 16 pages
Third virial coefficient of the unitary Bose gas
Creators: name: Castin, Yvan
name: Werner, Félix
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: By unitary Bose gas we mean a system composed of spinless bosons with s-wave interaction of infinite scattering length and almost negligible (real or effective) range. Experiments are currently trying to realize it with cold atoms. From the analytic solution of the three-body problem in a harmonic potential, and using methods previously developed for fermions, we determine the third cumulant (or cluster integral) b_3 and the third virial coefficient a_3 of this gas, in the spatially homogeneous case, as a function of its temperature and the three-body parameter R_t characterizing the Efimov effect. A key point is that, converting series into integrals (by an inverse residue method), and using an unexpected small parameter (the three-boson mass angle nu=pi/6), one can push the full analytical estimate of b_3 and a_3 up to an error that is in practice negligible. ----- Nous entendons par gaz de Bose unitaire un systeme compose de bosons sans spin interagissant dans l'onde s par un potentiel de longueur de diffusion infinie et de portee (reelle ou effective) presque negligeable, systeme pour l'instant abstrait mais dont la tentative de realisation avec des atomes froids est en cours. A partir de la solution analytique connue du probleme a trois corps dans un piege harmonique, et de methodes precedemment developpees pour des fermions, nous determinons le troisieme cumulant b_3, puis le troisieme coefficient du viriel a_3 de ce gaz, dans le cas spatialement homogene, en fonction de sa temperature et du parametre a trois corps R_t caracterisant l'effet Efimov. Un point marquant est qu'en convertissant des series en des integrales (par une methode des residus inverse), puis en utilisant un petit parametre inattendu, l'angle de masse nu=pi/6 des trois bosons, on peut pousser l'estimation completement analytique de b_3 et de a_3 jusqu'a une erreur en pratique negligeable.
description: 9 pages, one figure; problem with cross-referencing of footnotes solved; french version added
Ferroelectricity from iron valence ordering in rare earth ferrites?
Creators: name: Angst, Manuel
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The possibility of multiferroicity arising from charge ordering in LuFe2O4 and structurally related rare earth ferrites is reviewed. Recent experimental work on macroscopic indications of ferroelectricity and microscopic determination of coupled spin and charge order indicates that this scenario does not hold. Understanding the origin of the experimentally observed charge and spin order will require further theoretical work. Other aspects of recent research in these materials, such as geometrical frustration effects, possible electric-field-induced transitions, or orbital order are also briefly treated.
description: 18 pages, 16 figures; invited Review@RRL, published version has many figures in significantly higher quality; early view accessible via DOI, assigned to issue 7