cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Vorträge der Wissenschaftlerinnen und Wissenschaftler / Conférences des chercheurs
Creators: name: Redaktion, Die
Publisher: name: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel
Year: 2017

description: -
description: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel, Jahresbericht / Rapport annuel 2015/2016
Periodic Solutions of Generalized Schrödinger Equations on Cayley Trees
Creators: name: Hiroshima, Fumio
name: Lörinczi, József
name: Rozikov, Utkir
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 39A12, 82B26

description: In this paper we define a discrete generalized Laplacian with arbitrary real power on a Cayley tree. This Laplacian is used to define a discrete generalized Schrödinger operator on the tree. The case discrete fractional Schrödinger operators with index $0 < α< 2$ is considered in detail, and periodic solutions of the corresponding fractional Schrödinger equations are described. This periodicity depends on a subgroup of a group representation of the Cayley tree. For any subgroup of finite index we give a criterion for eigenvalues of the Schrödinger operator under which periodic solutions exist. For a normal subgroup of infinite index we describe a wide class of periodic solutions.
description: 14 pages, 3 figures. To appear in Commun. Stoch. Anal
The Responses of Consumption and Prices in Japan to the COVID-19 Crisis and the Tohoku Earthquake
Creators: name: Watanabe, Tsutomu
Publisher: name: Columbia University
Year: 2020
Subjects: Economics
Natural disasters--Economic aspects
Consumption (Economics)
Prices
Tohoku Earthquake and Tsunami (Japan : 2011)
COVID-19 (Disease)--Social aspects

description: This note compares the responses of consumption and prices to the COVID-19 shock and another large-scale natural disaster that hit Japan, the Tohoku earthquake in March 2011. The comparison shows that the responses of supermarket sales and prices at a daily frequency during the two crises are quite similar: (1) the year-on-year rate of sales growth increased quickly and reached a peak of 20 percent two weeks after the outbreak of COVID-19 in Japan, which is quite similar to the response immediately after the earthquake; (2) the items consumers purchased at supermarkets in these two crisis are almost identical; (3) the year-on-year rate of consumer price inflation for goods rose by 0.6 percentage points in response to the coronavirus shock, compared to 2.2 percentage points in the wake of the earthquake. However, evidence suggests that whereas people expected higher inflation for goods and services in the wake of the earthquake, they expect lower inflation in response to the coronavirus shock. This difference in inflation expectations suggests that the economic deterioration due to COVID-19 should be viewed as driven mainly by an adverse aggregate demand shock to face-to-face service industries such as hotels and leisure, transportation, and retail, rather than as driven by an aggregate supply shock.
Testing Cosmology with Double Source Lensing
Creators: name: Sharma, Divij
name: Collett, Thomas E.
name: Linder, Eric V.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Double source lensing provides a dimensionless ratio of distance ratios, a "remote viewing" of cosmology through distances relative to the gravitational lens, beyond the observer. We use this to test the cosmological framework, particularly with respect to spatial curvature and the distance duality relation. We derive a consistency equation for constant spatial curvature, allowing not only the investigation of flat vs curved but of the Friedmann-Lemaître-Robertson-Walker framework itself. For distance duality, we demonstrate that the evolution of the lens mass profile slope must be controlled to $\gtrsim5$ times tighter fractional precision than a claimed distance duality violation. Using LENSPOP forecasts of double source lensing systems in Euclid and LSST surveys we also explore constraints on dark energy equation of state parameters and any evolution of the lens mass profile slope.
description: 10 pages, 7 figures. v2 matches version accepted to JCAP
Affinity of extracellular phosphatases for ELF97 phosphate in aquatic environments
Creators: name: Nedoma, Jiří
name: Van Wambeke, France
name: Štrojsová, Alena
name: Štrojsová, Martina
name: Duhamel, Solange
Publisher: name: Columbia University
Year: 2007
Subjects: Biogeochemistry
Marine microbiology
Freshwater microbiology
Plankton
Phosphatases

description: Recently, the phosphatase substrate ELF97 phosphate (ELFP) has been employed to study the presence of extracellular phosphatases in different plankton populations in natural aquatic environments. Kinetic properties of ELFP hydrolysis by natural extracellular phosphatases are, however, mostly unknown. We indirectly studied the affinity of extracellular phosphatases for ELFP in different aquatic environments through its ability to inhibit the hydrolysis of 4-methylumbelliferyl phosphate (4MUP). Values of inhibition constants, Kᵢ, which correspond to the concentrations necessary for half saturation of phosphatases by ELFP, were lowest (0.18–4.5 µmol L⁻¹) in the oligotrophic Mediterranean Sea. We found higher values (i.e. lower affinity) in oligo- to mesotrophic acidified lakes (5.2–14 µmol L–1), in a eutrophic reservoir (13–35 µmol L⁻¹) and in a pure culture of the marine bacterium Alteromonas infernus (29 µmol L⁻¹). ELFP had a pronounced effect on the parameter Km (Michaelis constant) of 4MUP saturation kinetics, while its effect on the parameter Vmax was low. This behaviour is compatible with the assumption of competitive interaction between 4MUP and ELFP. Our experiments indicated that the assay ELFP concentration in the detection kit used was 250–500 µmol L⁻¹ (after the recommended dilution to a ratio of 1:20), which would ensure >99% saturation of extracellular phosphatases in marine environments and >90% saturation in the studied fresh waters.
Cat Mother
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2019

description: Edited live sounding recordings of "Soft breezes/Did you go to Chicago? Did you you see what they did there?", "Have you seen Marie?", "Good old Rock n Roll [medley]" including, "Chantilly Lace," "Whole Lotta Shakin Goin On", "Blue Suede Shoes," "Come Along and Be My Party Doll
A perturbative expansion scheme for supermembrane and matrix theory
Creators: name: Lechtenfeld, Olaf
name: Nicolai, Hermann
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We reconsider the supermembrane in a Minkowski background and in the light-cone gauge as a one-dimensional gauge theory of area preserving diffeomorphisms (APDs). Keeping the membrane tension $T$ as an independent parameter we show that $T$ is proportional to the square of the gauge coupling $g$ of this gauge theory, such that the small (large) tension limit of the supermembrane corresponds to the weak (strong) coupling limit of the APD gauge theory and its SU$(N)$ matrix model approximation. A perturbative linearization of the supersymmetric theory suitable for a quantum mechanical path-integral treatment can be achieved by formulating a Nicolai map for the matrix model, which we work out explicitly to ${\cal O}(g^4)$. The corresponding formulae remain well-defined in the limit $N{\to}\infty$; this result relies on a cancellation of infinities not present for the bosonic membrane, indicating that the $N{\to}\infty$ limit does not exist for the purely bosonic matrix model. Furthermore we show that the map has improved convergence properties in comparison with the usual perturbative expansions because its Jacobian admits an expansion in $g$ with a non-zero radius of convergence. Possible implications for unsolved issues with the matrix model of M theory are also mentioned.
description: 1+26 pages, no figures; v2: expanded explanations, 8 refs. added, matches published version; v3: 2 more refs., T~g^2, eqs. (2.10), (2.23), (2.41) corrected
Growth and specific P-uptake rates of bacterial and phytoplanktonic communities in the Southeast Pacific (BIOSOPE cruise)
Creators: name: Duhamel, Solange
name: Moutin, Thierry
name: Van Wambeke, France
name: Van Mooy, B. A. S.
name: Rimmelin, P.
name: Raimbault, Patrick
name: Claustre, H.
Publisher: name: Columbia University
Year: 2007
Subjects: Biogeochemistry
Marine microbiology
Heterotrophic bacteria
Phytoplankton
Phytoplankton--Growth

description: Predicting heterotrophic bacteria and phytoplankton specific growth rates (μ ) is of great scientific interest. Many methods have been developed in order to assess bacterial or phytoplankton μ. One widely used method is to estimate μ from data obtained on biomass or cell abundance and rates of biomass or cell production. According to Kirchman (2002), the most appropriate approach for estimating μ is simply to divide the production rate by the biomass or cell abundance estimate. Most methods using this approach to estimate μ are based on carbon (C) incorporation rates and C biomass measurements. Nevertheless it is also possible to estimate μ using phosphate (P) data. We showed that particulate phosphate (PartP) can be used to estimate biomass and that the P uptake rate to PartP ratio can be employed to assess μ. Contrary to other methods using C, this estimator does not need conversion factors and provides an evaluation of μ for both autotrophic and heterotrophic organisms. We report values of P-based μ in three size fractions (0.2–0.6; 0.6–2 and >2 μm) along a Southeast Pacific transect, over a wide range of P-replete trophic status. P-based μ values were higher in the 0.6–2 μm fraction than in the >2 μm fraction, suggesting that picoplankton-sized cells grew faster than the larger cells, whatever the trophic regime encountered. Picoplankton-sized cells grew significantly faster in the deep chlorophyll maximum layer than in the upper part of the photic zone in the oligotrophic gyre area, suggesting that picoplankton might outcompete >2 μm cells in this particular high-nutrient, low-light environment. P-based μ attributed to free-living bacteria (0.2-0.6 μm) and picoplankton (0.6–2 μm) size-fractions were relatively low (0.11±0.07 d⁻¹ and 0.14±0.04 d⁻¹, respectively) in the Southeast Pacific gyre, suggesting that the microbial community turns over very slowly.
Schwere tropfenförmige Steinanhänger der Pfyner Kultur und andere neolithische Kalksteinobjekte vom Bodensee
Creators: name: Schlichtherle, Helmut
Publisher: name: Fundberichte aus Baden-Württemberg
Year: 2017

description: [nicht vorhanden / not available]
description: Fundberichte aus Baden-Württemberg, Bd. 13 (1988): Fundberichte aus Baden-Württemberg
title: [εκ]sparience: ο χώρος ως η τρίτη διάσταση της εκπαιδευτικής διαδικασίας
Creators: name: Πασχιδη Μαριανα
name: Μοσχουτη-Βερμερ Αννα-Μαρια
Publisher: name: Technical University of Crete
Year: 2015

description: Η ερευνητική αυτή εργασία έχει ως στόχο της, μέσω της εστίασης στη σημασία του εκπαιδευτικού περιβάλλοντος στην εξέλιξη των παιδιών, να προτείνει δυνητικά ιδανικούς χώρους στα δημοτικά σχολεία της Ελλάδας με γνώμονα την αξία της αλληλεπίδρασης των μαθητών με το σχολικό περιβάλλον, επιχειρώντας να συνθέσει μια μεθοδολογία σχεδιασμού απευθυνόμενη σε αρχιτέκτονες εκπαιδευτικών χώρων.
Non-monotonic behavior of the Binder Parameter in the discrete spin systems
Creators: name: Watanabe, Hiroshi
name: Motoyama, Yuichi
name: Morita, Satoshi
name: Kawashima, Naoki
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study a non-monotonic behavior of the Binder parameter, which appears in the discrete spin systems. We show that the Binder parameters of the Potts model are non-monotonic for $q=3$ and $4$, while they are monotonic for the Ising case ($q=2$). Using the Fortuin-Kasteleyn graph representation, we find that the improved estimator of the Binder parameter consists of two terms with values only in high- and low-temperature regions. The non-monotonic behavior is found to originate from the low-temperature term. With the appropriately defined order parameter, we can reduce the influence of the low-temperature term, and as a result, the non-monotonic behavior can also be reduced. We propose new definitions of the order parameter, which reduces or eliminates the non-monotonic behavior of the Binder parameter in a system for which the improved estimator of the Binder parameter is unknown.
description: 20 pages, 12 figures, added new results
Microscopic Optical Potentials: recent achievements and future perspectives
Creators: name: Finelli, P.
name: Vorabbi, M.
name: Giusti, C.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Few years ago we started the investigation of microscopic Optical Potentials (OP) in the framework of chiral effective field theories and published our results in a series of manuscripts. Starting from the very first work, where a microscopic OP was introduced following the multiple scattering procedure of Watson, and then followed by more recent works, where the agreement with experimental data and phenomenological approaches was successfully tested, we finally arrived at a description of elastic scattering processes off non-zero spin nuclei. Among our achievements, it is worth mentioning the partial inclusion of three-nucleon forces, and the extension of our OP to antiproton-nucleus elastic scattering. Despite the overall good agreement with empirical data obtained so far, we do believe that several improvements and upgrades of the present approach are still to be achieved. In this short essay we would like to address some of the most relevant achievements and discuss an interesting development that, in our opinion, is needed to further improve microscopic OPs in order to reach in a near future the same level of accuracy of the phenomenological ones.
description: 8 pages, 4 figures, Conference proceedings of the 13th International Spring Seminar on Nuclear Physics, Sant'Angelo d'Ischia, May 15-20, 2022
Optimal Control in Stochastic Thermodynamics
Creators: name: Blaber, Steven
name: Sivak, David A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We review recent progress in optimal control in stochastic thermodynamics. Theoretical advances provide in-depth insight into minimum-dissipation control with either full or limited (parametric) control, and spanning the limits from slow to fast driving and from weak to strong driving. Known exact solutions give a window into the properties of minimum-dissipation control, which are reproduced by approximate methods in the relevant limits. Connections between optimal-transport theory and minimum-dissipation protocols under full control give deep insight into the properties of optimal control and place bounds on the dissipation of thermodynamic processes. Since minimum-dissipation protocols are relatively well understood and advanced approximation methods and numerical techniques for estimating minimum-dissipation protocols have been developed, now is an opportune time for application to chemical and biological systems.
Die südgallische Reliefsigillata - Kritische Bemerkungen zur Chronologie und zu Untersuchungsmethoden. Eine Stellungnahme zu dem Aufsatz von B. Pferdehirt im Jahrbuch RGZM. 33, 1986
Creators: name: Eschbaumer, Pia
name: Faber, Andrea
Publisher: name: Fundberichte aus Baden-Württemberg
Year: 2017

description: [nicht vorhanden / no available]
description: Fundberichte aus Baden-Württemberg, Bd. 13 (1988): Fundberichte aus Baden-Württemberg
title: Μετατρέποντας το σχολείο σε ένα χώρο για παιδιά
Creators: name: Μοσχουτη-Βερμερ Αννα-Μαρια
name: Πασχιδη Μαριανα
Publisher: name: Technical University of Crete
Year: 2015

description: Πρόταση επεμβάσεων σε υφιστάμενο δημοτικό σχολείο στο Χαλάνδρι Αττικής, με στόχο την αναβάθμιση του εκπαιδευτικού περιβάλλοντος, ώστε να προάγει την υγιέστερη σωματική και πνευματική ανάπτυξη των παιδιών.
Asymptotic deviation bounds for cumulative processes
Creators: name: Cattiaux, Patrick
name: Colombani, Laetitia
name: Costa, Manon
Publisher: name: arXiv
Year: 2021
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60F10, 60K15

description: The aim of this paper is to get asymptotic deviation bounds via a Large Deviation Principle (LDP) for cumulative processes also known as compound renewal processes or renewal-reward processes. These processes cumulate independent random variables occurring in time interval given by a renewal process. Our result extends the one obtained in Lefevere et al. (2011) in the sense that we impose no specific dependency between the cumulated random variables and the renewal process and the proof uses Mariani et al. (2014). In the companion paper Cattiaux-Costa-Colombani (2021) we apply this principle to Hawkes processes with inhibition. Under some assumptions Hawkes processes are indeed cumulative processes, but they do not enter the framework of Lefevere et al. (2011).
Multislice forward modeling of Coherent Surface Scattering Imaging on surface and interfacial structures
Creators: name: Myint, Peco
name: Chu, Miaoqi
name: Tripathi, Ashish
name: Wojcik, Michael J.
name: Zhou, Jian
name: Cherukara, Mathew J.
name: Narayanan, Suresh
name: Wang, Jin
name: Jiang, Zhang
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: To study nanostructures on substrates, surface-sensitive reflection-geometry scattering techniques such as grazing incident small angle x-ray scattering are commonly used to yield an averaged statistical structural information of the surface sample. Grazing incidence geometry can probe the absolute three-dimensional structural morphology of the sample if a highly coherent beam is used. Coherent Surface Scattering Imaging (CSSI) is a powerful yet non-invasive technique similar to Coherent X-ray Diffractive Imaging (CDI) but performed at small angles and grazing-incidence reflection geometry. A challenge with CSSI is that conventional CDI reconstruction techniques cannot be directly applied to CSSI because the Fourier-transform-based forward models cannot reproduce the dynamical scattering phenomenon near the critical angle of total external reflection of the substrate-supported samples. To overcome this challenge, we have developed a multislice forward model which can successfully simulate the dynamical or multi-beam scattering generated from surface structures and the underlying substrate. The forward model is also demonstrated to be able to reconstruct an elongated 3D pattern from a single shot scattering image in the CSSI geometry through fast-performing CUDA-assisted PyTorch optimization with automatic differentiation.
description: 12 pages, 4 figures, 1 table
Thin film deposition with time varying temperature
Creators: name: de Assis, T. A.
name: Reis, F. D. A. A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences
subject: 82

description: We study the effects of time-dependent substrate/film temperature in the deposition of a mesoscopically thick film using a statistical model that accounts for diffusion of adatoms without lateral neighbors whose coefficients depend on an activation energy and temperature. Dynamic scaling with fixed temperature is extended to predict conditions in which the temperature variation significantly affects surface roughness scaling. It agrees with computer simulation results for deposition of up to ${10}^4$ atomic layers and maximal temperature changes of $30 K$, near or below the room temperature. If the temperature decreases during the growth, the global roughness may have a rapid growth, with effective exponents larger than 1/2 due to the time-decreasing adatom mobility. The local roughness in small box size shows typical evidence of anomalous scaling, with anomaly exponents depending on the particular form of temperature decrease. If the temperature increases during the growth, a non-monotonic evolution of the global roughness may be observed, which is explained by the competition of kinetic roughening and the smoothing effect of increasing diffusion lengths. The extension of the theoretical approach to film deposition with other activation energy barriers shows that similar conditions on temperature variation may lead to the same morphological features. Equivalent results may also be observed by controlling the deposition flux.
description: 18 pages, 8 figures
title: Ρεολογικές ιδιότητες πολφών μπεντονίτη μετά από ωρίμανση σε υψηλές θερμοκρασίες
Creators: name: Λυτρα Σοφια
Publisher: name: Technical University of Crete
Year: 2016

description: Οι άργιλοι και ειδικότερα ο μπεντονίτης χρησιμοποιούνται ευρέως ως ρευστά γεώτρησης διότι σχηματίζουν σταθερούς και παχύρευστους πολφούς. Μελετώντας την δομή του μπεντονίτη είναι εφικτό να ερμηνευτεί και η ρεολογική συμπεριφορά που παρουσιάζει και ειδικότερα σε υψηλές θερμοκρασίες. Η ανάγκη για πραγματοποίηση γεωτρήσεων σε μεγαλύτερα βάθη δηλαδή σε νέα πιο απαιτητικά περιβάλλοντα είναι πλέον γεγονός. Η ρεολογική συμπεριφορά του μπεντονίτη είναι περίπλοκη, μη νευτώνεια και εξαρτάται από πολλούς παράγοντες και οι αλλαγές που παρουσιάζει με αύξηση της θερμοκρασίας δεν έχουν κατανοηθεί πλήρως. Εφαρμόστηκαν διάφορες τεχνικές χαρακτηρισμού των μπεντονιτών όπως XRD και XRF, με στόχο τον προσδιορισμό των ορυκτολογικών φάσεων και της χημικής σύστασης αντίστοιχα, των δειγμάτων. Επιπλέον, μελετήθηκαν ορισμένες ιδιότητες του σμεκτίτη (κύριο συστατικό του μπεντονίτη) όπως είναι η ιοντοανταλλακτικη ικανότητα (CEC), η θερμοκρασία αφυδροξυλίωσης και  το φορτίο κρυσταλλικής δομής (layer charge) ώστε να έχουμε μια πιο πλήρη εικόνα των δειγμάτων. Για την εξέταση των ρεολογικών ιδιοτήτων, πολφοί με 5% περιεκτικότητα σε στερεά  υπέστησαν δυναμική γήρανση σε ένα εύρος θερμοκρασιών από τους 25°C έως 176°C, έγινε μέτρηση του ιξώδους τους σε δύο εργαστηριακά ιξωδόμετρα και προσδιορισμός των διηθητικών ικανοτήτων τους. Επιπλέον, οι ρεολογικές παράμετροι  υπολογίστηκαν σύμφωνα με τα πρότυπα του Αμερικανικού Ινστιτούτου Πετρελαίου (API13A). Τα αποτελέσματα της εργασίας έδειξαν ότι το ιξώδες των αιωρημάτων  αυξάνεται με την αύξηση της θερμοκρασίας, ενώ οι υπόλοιπες ρεολογικές παράμετροι που υπολογίστηκαν μεταβάλλονται και αυτές. Με τις πειραματικές διαδικασίες που έλαβαν χώρα δεν επιτεύχθηκε η πλήρης κατανόηση των μεταβολών που εμφανίστηκαν, ωστόσο τα αποτελέσματα μπορούν να χρησιμοποιηθούν για εκτεταμένη μελλοντική έρευνα.
Phosphate availability and the ultimate control of new nitrogen input by nitrogen fixation in the tropical Pacific Ocean
Creators: name: Moutin, Thierry
name: Karl, David M.
name: Duhamel, Solange
name: Rimmelin, P.
name: Raimbault, Patrick
name: Van Mooy, B. A. S.
name: Claustre, H.
Publisher: name: Columbia University
Year: 2008
Subjects: Biogeochemistry
Marine microbiology
Phosphorus cycle (Biogeochemistry)
Nitrogen--Fixation

description: Due to the low atmospheric input of phosphate into the open ocean, it is one of the key nutrients that could ultimately control primary production and carbon export into the deep ocean. The observed trend over the last 20 years has shown a decrease in the dissolved inorganic phosphate (DIP) pool in the North Pacific gyre, which has been correlated to the increase in di-nitrogen (N2) fixation rates. Following a NW-SE transect, in the Southeast Pacific during the early austral summer (BIOSOPE cruise), we present data on DIP, dissolved organic phosphate (DOP) and particulate phosphate (PP) pools along with DIP turnover times (TDIP) and N2 fixation rates. We observed a decrease in DIP concentration from the edges to the centre of the gyre. Nevertheless the DIP concentrations remained above 100 nmol L−1 and T DIP was more than 6 months in the centre of the gyre; DIP availability remained largely above the level required for phosphate limitation to occur and the absence of Trichodesmium spp and low nitrogen fixation rates were likely to be controlled by other factors such as temperature or iron availability. This contrasts with recent observations in the North Pacific Ocean at the ALOHA station and in the western Pacific Ocean at the same latitude (DIAPALIS cruises) where lower DIP concentrations (<20 nmol L−1) and T DIP <50 h were measured during the summer season in the upper layer. The South Pacific gyre can be considered a High Phosphate Low Chlorophyll (HPLC) oligotrophic area, which could potentially support high N2 fixation rates and possibly carbon dioxide sequestration, if the primary ecophysiological controls, temperature and/or iron availability, were alleviated.
Römerzeitliche Brunnenfüllung im Vicus von Mainhardt, Kreis Schwäbisch Hall. Botanische Untersuchungen
Creators: name: Körber-Grohne, Udelgard
name: Rösch, Manfred
Publisher: name: Fundberichte aus Baden-Württemberg
Year: 2017

description: [nicht vorhanden / not available]
description: Fundberichte aus Baden-Württemberg, Bd. 13 (1988): Fundberichte aus Baden-Württemberg
title: Ορυκτολογική-πετρογραφική μελέτη και διερεύνηση εμπλουτισιμότητας του λατεριτικού σιδηρονικελιούχου μεταλλεύματος του κοιτάσματος Hudenisht της περιοχής Pogradec (Αλβανία)
Creators: name: Τσελεμπης Ρωμανος
Publisher: name: Technical University of Crete
Year: 2016

description: Το αντικείμενο της διπλωματικής εργασίας είναι η ορυκτολογική και πετρογραφική διερεύνηση του σιδηρονικελιούχου μεταλλεύματος του Hudenisht, η γεωχημική κατανομή των στοιχείων κατά μήκος της τομής δειγματοληψίας καθώς και σ’ ένα μεγάλο μέρος η δυνατότητα εμπλουτισμού του με τις μεθόδους του βαρυτομετρικού και μαγνητικού διαχωρισμού.
 Σύμφωνα με τη  γεωλογία  της περιοχής του Pogradec το σιδηρονικελιούχο κοίτασμα αναπτύσσεται με μορφή στρωμάτων επάνω σε υπερβασικά πετρώματα μεταβαλλόμενης σύστασης (από χαρτσβουργίτες μέχρι σερπεντινίτες) και επικαλύπτεται από ασβεστολίθους του ανώτερου Κρητιδικού. Σημαντικότερα ορυκτά του μεταλλεύματος είναι ο αιματίτης, ο γκαιτίτης και ο χρωμίτης και τα οποία βρίσκονται σε μεγαλύτερο ποσοστό. Σε μικρότερο ποσοστό έχουμε νικελιούχο χλωρίτη (νιμίτη), λιζαρδίτη, ασβεστίτη και σπινέλλιο. Κύριος φορέας του νικελίου είναι ο νικελιούχος χλωρίτης . Με βάση τη γεωχημική κατανομή του μεταλλεύματος οι μεγαλύτερες περιεκτικότητες του νικελίου βρίσκονται στο στρώμα του εξαλλοιωμένου οφιολίθου και του αργιλικού στρώματος με ποσοστά 2,81% και 1,77% αντιστοίχως.
Κατά τον εμπλουτισμό του μεταλλεύματος με τη μέθοδο των βαρέων υγρών, χρησιμοποιήθηκαν τα κοκκομετρικά κλάσματα -8+4 mm, -4+1 mm, -1+0,250 mm και -0,250+0,063 mm, όπου διαπιστώθηκε ότι η περιεκτικότητα του νικελίου είναι μεγαλύτερη στα ελαφριά προϊόντα του, αλλά η κατανομή του νικελίου είναι ως επί το πλείστον στα βαριά προϊόντα. Το παραπάνω αποτέλεσμα συμβαίνει κατά το βαρυτομετρικό διαχωρισμό με βαρέα υγρά, ενώ με βαρέα διάμεσα σε δύο κλάσματα το -8+4 mm και το-4+1 mm, όπου έλαβε χώρα η μέθοδος αυτή, επετεύχθη και κατανομή του νικελίου στα ελαφριά προϊόντα.
Κατά το μαγνητικό διαχωρισμό, χρησιμοποιήθηκαν και πάλι οι ίδιες κοκκομετρίες. Για τα δύο χονδρύτερα κλάσματα χρησιμοποιήθηκε ο ταινιοφόρος μαγνητικός διαχωριστής (perm roll), ενώ για τα δύο λεπτότερα ο ξηρός επαγωγικός μαγνητικός διαχωριστής υψηλής έντασης (high intensity induced magnetic separator). Διαπιστώθηκε ότι το νικέλιο παρουσιάζει μεγαλύτερη περιεκτικότητα στα κλάσματα -8+4 mm, -4+1 mm, -1+0,250 mm στα μαγνητικά προϊόντα, ενώ στο κλάσμα -0,250+0,063 mm εμφανίζει μεγαλύτερη περιεκτικότητα στα μη μαγνητικά προϊόντα. Η κατανομή του νικελίου είναι σε όλες τις περιπτώσεις στα μαγνητικά προϊόντα.
Από τις δύο μεθόδους εμπλουτισμού, που χρησιμοποιήθηκαν, ο βαρυτομετρικός διαχωρισμός έδειξε σχετικά καλύτερα αποτελέσματα.
Combined first-principles and EXAFS study of structural instability in BaZrO3
Creators: name: Lebedev, A. I.
name: Sluchinskaya, I. A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Phonon spectrum of cubic barium zirconate is calculated from first principles using the density functional theory. Unstable phonon mode with the $R_{25}$ symmetry in the phonon spectrum indicates an instability of the cubic structure with respect to rotations of the oxygen octahedra. It is shown that the ground-state structure of the crystal is $I4/mcm$. In order to find the manifestations of the predicted instability, EXAFS measurements at the Ba $L_{\rm III}$-edge are used to study the local structure of BaZrO$_3$ at 300 K. An enhanced value of the Debye-Waller factor for the Ba-O atomic pair ($σ^2_1 \sim 0.015$ Å$^2$) revealed in the experiment is associated with the predicted structural instability. The average amplitude of the thermal octahedra rotation estimated from the measured $σ^2_1$ value is $\sim$4 degrees at 300 K. The closeness of the calculated energies of different distorted phases resulting from the condensation of the $R_{25}$ mode suggests a possible structural glass formation in BaZrO$_3$ when lowering temperature, which explains the cause of the discrepancy between the calculations and experiment.
description: 5 pages, 2 figures, 4 tables
Single-Spin Readout and Quantum Sensing using Optomechanically Induced Transparency
Creators: name: Koppenhöfer, Martin
name: Padgett, Carl
name: Cady, Jeffrey V.
name: Dharod, Viraj
name: Oh, Hyunseok
name: Jayich, Ania C. Bleszynski
name: Clerk, A. A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Solid-state spin defects are promising quantum sensors for a large variety of sensing targets. Some of these defects couple appreciably to strain in the host material. We propose to use this strain coupling for mechanically-mediated dispersive single-shot spin readout by an optomechanically-induced transparency measurement. Surprisingly, the estimated measurement times for negatively-charged silicon-vacancy defects in diamond are an order of magnitude shorter than those for single-shot optical fluorescence readout. Our scheme can also be used for general parameter-estimation metrology and offers a higher sensitivity than conventional schemes using continuous position detection.
description: 7+19 pages, 3+4 figures, equivalent to published version
Hypocoercivity for non-linear infinite-dimensional degenerate stochastic differential equations
Creators: name: Eisenhuth, Benedikt
name: Grothaus, Martin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Probability (math.PR)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 37A25, 60H15, 47D07, 60J45

description: The aim of this article is to construct solutions to second order in time stochastic partial differential equations and to show hypocoercivity of the corresponding transition semigroups. More generally, we analyze non-linear infinite-dimensional degenerate stochastic differential equations in terms of their infinitesimal generators. In the first part of this article we use resolvent methods developed by Beznea, Boboc and Röckner to construct diffusion processes with infinite lifetime and explicit invariant measures. The processes provide weak solutions to infinite-dimensional Langevin dynamics. The second part deals with a general abstract Hilbert space hypocoercivity method, developed by Dolbeaut, Mouhot and Schmeiser. In order to treat stochastic (partial) differential equations, Grothaus and Stilgenbauer translated these concepts to the Kolmogorov backwards setting taking domain issues into account. To apply these concepts in the context of infinite-dimensional Langevin dynamics we use an essential m-dissipativity result for infinite-dimensional Ornstein-Uhlenbeck operators, perturbed by the gradient of a potential. We allow unbounded diffusion operators as coefficients and apply corresponding regularity estimates. Furthermore, essential m-dissipativity of a non-sectorial Kolmogorov backward operator associated to the dynamic is needed. Poincaré inequalities for measures with densities w.r.t. infinite-dimensional non-degenerate Gaussian measures are studied. Deriving a stochastic representation of the semigroup generated by the Kolmogorov backward operator as the transition semigroup of a diffusion process enables us to show an $L^2$-exponential ergodicity result for the weak solution. Finally, we apply our results to explicit infinite-dimensional degenerate diffusion equations.
Eine neue Weiheinschrift eines Centurio der Legio VIII Augusta aus Brötzingen, Stadtkreis Pforzheim
Creators: name: Schallmayer, Egon
Publisher: name: Fundberichte aus Baden-Württemberg
Year: 2017

description: [nicht vorhanden / not available]
description: Fundberichte aus Baden-Württemberg, Bd. 13 (1988): Fundberichte aus Baden-Württemberg
Combined constraints on dark photons and discovery prospects at the LHC and the Forward Physics Facility
Creators: name: Aboubrahim, Amin
name: Altakach, Mohammad Mahdi
name: Klasen, Michael
name: Nath, Pran
name: Wang, Zhu-Yao
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Hidden sectors are ubiquitous in supergravity theories, in strings and in branes. Well motivated models such as the Stueckelberg hidden sector model could provide a candidate for dark matter. In such models, the hidden sector communicates with the visible sector via the exchange of a dark photon (dark $Z'$) while dark matter is constituted of Dirac fermions in the hidden sector. Using data from collider searches and precision measurements of SM processes as well as the most recent limits from dark matter direct and indirect detection experiments, we perform a comprehensive scan over a wide range of the $Z'$ mass and set exclusion bounds on the parameter space from sub-GeV to several TeV. We then discuss the discovery potential of an $\mathcal{O}$(TeV) scale $Z'$ at HL-LHC and the ability of future forward detectors to probe very weakly interacting sub-GeV $Z'$ bosons. Our analysis shows that the parameter space in which a $Z'$ can decay to hidden sector dark matter is severely constrained whereas limits become much weaker for a $Z'$ with no dark decays. The analysis also favors a self-thermalized dark sector which is necessary to satisfy the dark matter relic density.
description: 35 pages, 15 figures. Accepted for publication in JHEP
Symmetry protected entanglement renormalization
Creators: name: Singh, Sukhwinder
name: Vidal, Guifre
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Entanglement renormalization is a real-space renormalization group (RG) transformation for quantum many-body systems. It generates the multi-scale entanglement renormalization ansatz (MERA), a tensor network capable of efficiently describing a large class of many-body ground states, including those of systems at a quantum critical point or with topological order. The MERA has also been proposed to be a discrete realization of the holographic principle of string theory. In this paper we propose the use of symmetric tensors as a mechanism to build a symmetry protected RG flow, and discuss two important applications of this construction. First, we argue that symmetry protected entanglement renormalization produces the proper structure of RG fixed-points, namely a fixed-point for each symmetry protected phase. Second, in the context of holography, we show that by using symmetric tensors, a global symmetry at the boundary becomes a local symmetry in the bulk, thus explicitly realizing in the MERA a characteristic feature of the AdS/CFT correspondence.
description: 5 pages, 3 figures
Thin film and surface preparation chamber for the low energy muons spectrometer
Creators: name: Teuschl, Hanna
name: Di Bernardo, Angelo
name: Lourenço, Leandro M. O.
name: Prokscha, Thomas
name: Vieira, Ricardo B. L.
name: Salman, Zaher
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We have designed and constructed a thin film preparation chamber with base pressure of $<2 \times 10^{-9}$~mbar. Currently, the chamber is equipped with two large area evaporators (a molecular evaporator and an electron-beam evaporator), an ion sputtering gun, a thickness monitor and a substrate heater. It is designed such that it can handle large area thin film samples with a future possibility to transfer them in vacuum directly to the low energy muons (LEM) spectrometer or to other advanced characterization facilities in the Quantum Matter and Materials Center (QMMC) which will be constructed in 2024. Initial commissioning of the chamber resulted in high quality, large area and uniform molecular films of CuPc and TbPc$_2$ on various substrate materials. We present first results from low energy $μ$SR (LE-$μ$SR) measurements on these films.
description: 8 pages, 7 figures, muSR2020 conference proceedings
title: Γεωηλεκτρική γεωφυσική διασκόπηση για την κατασκευή λιμνοδεξαμενής στο Οροπέδιο Ασκύφου Χανίων
Creators: name: Γρηγοριαδης Αλεξανδρος
Publisher: name: Technical University of Crete
Year: 2016

description: Στην παρούσα διπλωματική εργασία παρουσιάζονται τα αποτελέσματα από τη γεωφυσική διασκόπηση που πραγματοποιήθηκε στις ανατολικές παρυφές του οροπεδίου Ασκύφου, βόρεια του οικισμού Γωνί του Νομού Χανίων Κρήτης, με τη χρήση της ηλεκτρικής τομογραφίας. Στόχος της γεωφυσικής έρευνας είναι ο προσδιορισμός του πάχους των υπερκειμένων και επιφανειακών γεωλογικών σχηματισμών πάνω στους οποίους θα εδραστεί λιμνοδεξαμενή, η εκτίμηση της ποιότητας του ανθρακικού υποβάθρου, ο εντοπισμός ρηγμάτων και μεγάλων ζωνών διάβρωσης ή σπηλαίων, καθώς και η υπόδειξη κατάλληλων θέσεων δειγματοληπτικών γεωτρήσεων. Πάντως, σύμφωνα με το γεωλογικό χάρτη του Ι.Γ.Μ.Ε., εμφανίζονται στην ευρύτερη περιοχή μελέτης, αργιλοαμμώδεις αποθέσεις και ανακρυσταλλωμένοι ασβεστόλιθοι και μάρμαρα, τα οποία χρονολογούνται από τεταρτογενές - ολόκαινο και ανώτερο τριαδικό – λιάσιο, αντίστοιχα.
Αρχικά, στο θεωρητικό μέρος της εργασίας γίνεται αναφορά των ηλεκτρικών μεθόδων επικεντρώνοντας στην μέθοδο της ειδικής ηλεκτρικής αντίστασης, καθώς και στις διατάξεις των ηλεκτροδίων που ενδείκνυται να χρησιμοποιούνται ανάλογα με το σκοπό της γεωφυσικής έρευνας και την μορφολογία της περιοχής μελέτης. Ειδικότερα, αναφέρονται οι πιο συνηθισμένες διατάξεις, ενώ αξιολογούνται οι διατάξεις διπόλου – διπόλου και Gradient. Παράλληλα, αναλύονται τα σημαντικότερα σφάλματα κατά τη φάση διεξαγωγής των μετρήσεων της ειδικής ηλεκτρικής αντίστασης. Ακολούθως, παρουσιάζεται η τεχνική της ηλεκτρικής τομογραφίας, παραθέτοντας επιλεγμένα ερευνητικά άρθρα από την πιο πρόσφατη επιστημονική βιβλιογραφία που σχετίζεται με την εφαρμογή αυτής της τεχνικής για αντίστοιχους με την παρούσα εργασία στόχους.
Τέλος, η εφαρμογή της μεθόδου της ηλεκτρικής τομογραφίας πραγματοποιείται στο οροπέδιο Ασκύφου του Νομού Χανίων, προκειμένου να προσδιοριστεί η ειδική ηλεκτρική αντίσταση των πετρωμάτων των επιφανειακών γεωλογικών σχηματισμών και να διερευνηθεί η καταλληλότητα της εν λόγω θέσης για την υλοποίηση του έργου της λιμνοδεξαμενής. Στα πλαίσια αυτής της μελέτης, η γεωφυσική έρευνα περιλαμβάνει 6 γραμμές ηλεκτρικής τομογραφίας συνολικού μήκους 1.620 m. Για τις μετρήσεις της φαινόμενης ειδικής ηλεκτρικής αντίστασης στην περιοχή μελέτης χρησιμοποιήθηκαν οι διατάξεις διπόλου – διπόλου και Gradient. Η επεξεργασία των δεδομένων πραγματοποιήθηκε με τη χρήση κατάλληλων λογισμικών πακέτων, ήτοι Res2Dinv, ΕarthImager2D και EarthImager3D, απεικονίζοντας σε δισδιάστατες και τρισδιάστατες χρωματικές κατανομές την πραγματική ειδική ηλεκτρική αντίσταση στο υπέδαφος. Τέλος, εξάγονται χρήσιμα συμπεράσματα που ενθαρρύνουν την περαιτέρω έρευνα της περιοχής μελέτης για την κατασκευή λιμνοδεξαμενής. Ειδικότερα, το πάχος των υπερκειμένων σχηματισμών αναπτύσσεται μέχρι τα 20 m με πιθανότητα ύπαρξης μικρού ρήγματος. Το επαρκές πάχος των υπερκειμένων σε συνδυασμό με την μη εμφάνιση εγκοίλων είναι ενθαρρυντικά αποτελέσματα, οδηγώντας στην ανάγκη για περαιτέρω έρευνα και την υπόδειξη θέσεων για την διάνοιξη γεωτρήσεων.
Kastellvicus und Kastell. Untersuchungen zum Zugmantel im Taunus und zu den Kastellvici in Obergermanien und Rätien
Creators: name: Sommer, C. Sebastian
Publisher: name: Fundberichte aus Baden-Württemberg
Year: 2017

description: [nicht vorhanden / not available]
description: Fundberichte aus Baden-Württemberg, Bd. 13 (1988): Fundberichte aus Baden-Württemberg
title: Πετροφυσικά χαρακτηριστικά ψαμμιτών του νεογενούς (περιοχή Αρκαλοχώρι, Μεσσαρά, Κρήτη)
Creators: name: Σπαντιδακης Στυλιανος
Publisher: name: Technical University of Crete
Year: 2017

description: Σε μία εκτεταμένη περιοχή στην κεντρική Κρήτη, εντός της λεκάνης της Μεσσαράς, έχουν παρατηρηθεί κατά το παρελθόν διαφυγές αερίου από υδογεωτρήσεις που πραγματοποιήθηκαν. Γεωτρητικά δεδομένα υπέδειξαν ότι το μεθάνιο βρίσκεται πέραν των ιλυολίθων εντός ψαμμιτικών στρωμάτων που φιλοξενούν νερό υψηλής αλατότητας. Στην ευρύτερη γεωλογική λεκάνη της Μεσσαράς, οι ψαμμίτες που έχουν δημιουργηθεί, είναι ηλικίας από το Μέσο Μειόκαινο έως το Πλειόκαινο, ενώ ανήκουν σε διαφορετικά αποθετικά περιβάλλοντα. Συνεπώς τα πετροφυσικά χαρακτηριστικά των ψαμμιτών του Νεογενούς όπως το πορώδες, η διαπερατότητα και η κοκκομετρική κατανομή εξαρτώνται από τις προαναφερθείσες ιζηματολογικές συνθήκες, καθώς και από την διαδικασία της διαγένεσης.
Στόχος λοιπόν της εργασίας αυτής είναι η μέτρηση για πρώτη φορά του πορώδους και της διαπερατότητας με μεθοδολογίες που χρησιμοποιούνται στην έρευνα υδρογονανθράκων, σε μια μοναδική για την λιθολογική του εναλλαγή γεωλογική τομή κατά μήκος μιας νέας τεχνητής τομής που διανοίχτηκε κατά την κατασκευή του δρόμου από το Αρκαλοχώρι προς την Μάρθα. Κατά μήκος της τομής αυτής εμφανίζονται οι σχηματισμοί της Ομάδας του Τεφελίου: οι σχηματισμοί Βιάννου και Σκινιά και Αμπελούζου που εμφανίζουν κατά μήκος της τομής αυτής έντονα και διακριτά λιθολογικά χαρακτηριστικά, σε αντίθεση με τις υπόλοιπες περιοχές της Μεσσαράς. Σε παραπλήσιας κοκκομετρίας (ψαμμίτες)  αλλά διαφορετικής λιθολογίας πετρώματα (ψαμμίτες με διαφορετικά ποσοστά πυριτιοκλαστικών και ανθρακικών υλικών) προσεγγίστηκαν ιζηματολογικοί παράμετροι και σε ορισμένα δείγματα μετρήθηκαν και συγκρίθηκαν οι δύο πετροφυσικοί παράμετροι: το πορώδες και η διαπερατότητα.Στα ίδια δείγματα καθορίστηκαν ιζηματολογικοί παράμετροι που επέτρεψαν πέραν από τον λιθολογικό χαρακτηρισμό, την προσέγγιση του αποθετικού περιβάλλοντος των αρχικών ιζημάτων.
Review on 6D Object Pose Estimation with the focus on Indoor Scene Understanding
Creators: name: Nejatishahidin, Negar
name: Fayyazsanavi, Pooya
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: 6D object pose estimation problem has been extensively studied in the field of Computer Vision and Robotics. It has wide range of applications such as robot manipulation, augmented reality, and 3D scene understanding. With the advent of Deep Learning, many breakthroughs have been made; however, approaches continue to struggle when they encounter unseen instances, new categories, or real-world challenges such as cluttered backgrounds and occlusions. In this study, we will explore the available methods based on input modality, problem formulation, and whether it is a category-level or instance-level approach. As a part of our discussion, we will focus on how 6D object pose estimation can be used for understanding 3D scenes.
title: Optimization of petroleum production under industrial constraints using alternative objective functions and adjoint gradient-based techniques.
Creators: name: Φανδριδη Χριστινη
Publisher: name: Technical University of Crete
Year: 2017

description: The optimization of oil production is a tedious and computationally intensive pro-
cess that requires the solution of time dependent nonlinear set of partial differ-
ential equations describing the flow of hydrocarbons in anisotropic porous me-
dia. Optimization of production is usually performed using either gradient free
techniques like genetic algorithms, particle swarm algorithms, or gradient-based
techniques where the gradients are computed through the solution of the adjoint
problem. A gradient-based optimization method, in which the gradient is com-
puted using an adjoint formulation, is often the method of choice since in con-
trast to numerical perturbation techniques that require as many objective function
evaluations as the number of control parameters, the gradient using adjoint-based
techniques is obtained only at a small fraction of the time spent for the evaluation
of the objective function. It is well known that for non-convex optimisation prob-
lems, gradient-based techniques are likely to get trapped in poor local optima. A
common practise is to lunch several independent optimisation runs from different
initial guesses or to combine ideas from gradient-free algorithms with gradient-
based to benefit from the merits of both. An adequate sampling of the search space would require an intractable number of simulations and it is thus impossible.
The aim of this work is to exploit an observation in homogeneous reservoirs,
where the global optimum, when optimising cumulative oil recovery, is usually
achieved from practically any initial guess. This observation suggest to optimize
cumulative oil by adopting a “geology continuation” method. In this novel ap-
proach the porosity and permeability fields, gradually switch from some average
homogeneous values chosen heuristically for the particular benchmark, to the in-
homogeneous geological properties characterizing the reservoir. The optimal con-
trols from each step become the initial controls to the next step.
In addition instead of maximizing the cumulative oil we suggest to minimize mod-
ified versions of the residual oil function which are likely to be more convex and
thus less likely to lead in poor local optima.
Superconducting gap symmetry from Bogoliubov quasiparticle interference analysis on {Sr}$_2${RuO}$_4$
Creators: name: Bhattacharyya, Shinibali
name: Kreisel, Andreas
name: Kong, X.
name: Berlijn, T.
name: Rømer, Astrid T.
name: Andersen, Brian M.
name: Hirschfeld, P. J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The nature of the superconducting order parameter in {Sr}$_2${RuO}$_4$ has generated intense interest in recent years. Since the superconducting gap is very small, high resolution methods such as scanning tunneling spectroscopy might be the best chance to directly resolve the gap symmetry. Recently, a Bogoliubov quasiparticle interference imaging (BQPI) experiment has suggested that the $d_{x^2-y^2}$ gap symmetry is appropriate for {Sr}$_2${RuO}$_4$. In this work, we use a material-specific theoretical approach based on Wannier functions of the surface of {Sr}$_2${RuO}$_4$ to calculate the continuum density of states as detected in scanning tunneling microscopy experiments. We examine several different proposed gap order parameters, and calculate the expected BQPI pattern for each case. Comparing to the available experimental data, our results suggest that a $s'+id_{xy}$ gap order parameter is the most probable state, but the measured BQPI patterns still display features unaccounted for by the theory for any of the states currently under discussion.
description: 14 pages, 9 figures