cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Bestimmung der Wechselwirkungsrate des HERA-B targets und Untersuchung des coasting beam am HERA-Protonen-Ring
Creators: name: Spratte, Stefan
Publisher: name: Universität Dortmund
Year: 2000
Subjects: subject: HERA-B target
subject: coasting beam
subject: Teilchendetektor
subject: detector
subject: 530

description: Um eine erste signifikante Messung der CP-Verletzung im System der B-Mesonen zu erreichen, muss das interne HERA-B Target eine Wechselwirkungsrate von bis zu 40 MHz produzieren. Neben den Anforderungen, die dabei an das Target selbst gestellt werden, ergeben sich daraus auch Anforderungen an die Qualität einer Protonenfüllung im HERA Protonen-Speicherring. Damit festgestellt werden kann, ob das interne HERA-B Target die benötigte Wechselwirkungsrate produziert, ist die genaue Kenntnis der Wechselwirkungsrate von grundlegendem Interesse. Im Rahmen dieser Arbeit wird deshalb zunächst die Methode beschrieben, mit der die Wechselwirkungsrate des Drahttargets aus den Zählraten eines Systems von Szintillationszählern seit der Datennahmeperiode des Jahres 1996 bestimmt wird. Die Effizienz des HERA-B Experimentes wird durch Drahtwechselwirkungen von Protonen, die zeitlich zwischen den gefüllten Bunchen liegen, erheblich eingeschränkt. Ursache hierfür ist eine Gleichstromkomponente im HERA Protonen-Speicherring, die in jeder Protonenfüllung beobachtet wird. Gegenstand dieser Arbeit ist deshalb auch die Untersuchung der Zeitstruktur der durch das HERA-B Target erzeugten Wechselwirkungsrate auf dem zeitlichen Niveau des Abstands der einzelnen Protonenbunche. Anhand verschiedener Messungen werden damit Eigenschaften der den Gleichstromanteil bildenden Protonen untersucht und quantitativ erfasst. Ziel ist es, dadurch das Verständnis für die grundlegenden, den Gleichstrom produzierenden physikalischen Prozesse der longitudinalen Strahldynamik zu vertiefen.
Model Independent Periodogram for Scanning Astrometry
Creators: name: Binnenfeld, Avraham
name: Shahaf, Sahar
name: Zucker, Shay
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We present a new periodogram for periodicity detection in one-dimensional time-series data from scanning astrometry space missions, like Hipparcos or Gaia. The periodogram is non-parametric and does not rely on a full or approximate orbital solution. Since no specific properties of the periodic signal are assumed, the method is expected to be suitable for the detection of various types of periodic phenomena, from highly eccentric orbits to periodic variability-induced movers. The periodogram is an extension of the phase-distance correlation periodogram (PDC) we introduced in previous papers based on the statistical concept of distance correlation. We demonstrate the performance of the periodogram using publicly available Hipparcos data, as well as simulated data. We also discuss its applicability for Gaia epoch astrometry, to be published in the future data release 4 (DR4).
description: 7 pages, 4 figures. A&A accepted
Neutral Aggregation in Finite Length Genotype space
Creators: name: Houchmandzadeh, Bahram
Publisher: name: arXiv
Year: 2016
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: The advent of modern genome sequencing techniques allows for a more stringent test of the neutrality hypothesis of Darwinian evolution, where all individuals have the same fitness. Using the individual based model of Wright and Fisher, we compute the amplitude of neutral aggregation in the genome space, i.e., the probability of finding two individuals at genetic (hamming) distance k as a function of genome size L, population size N and mutation probability per base ν. In well mixed populations, we show that for Nν\textless{}1/L, neutral aggregation is the dominant force and most individuals are found at short genetic distances from each other. For Nν\textgreater{}1 on the contrary, individuals are randomly dispersed in genome space. The results are extended to geographically dispersed population, where the controlling parameter is shown to be a combination of mutation and migration probability. The theory we develop can be used to test the neutrality hypothesis in various ecological and evolutionary systems.
Learning without recall in directed circles and rooted trees
Creators: name: Rahimian, M. Amin
name: Jadbabaie, Ali
Publisher: name: arXiv
Year: 2016
Subjects: subject: Applications (stat.AP)
subject: Information Theory (cs.IT)
subject: Social and Information Networks (cs.SI)
subject: Probability (math.PR)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: This work investigates the case of a network of agents that attempt to learn some unknown state of the world amongst the finitely many possibilities. At each time step, agents all receive random, independently distributed private signals whose distributions are dependent on the unknown state of the world. However, it may be the case that some or any of the agents cannot distinguish between two or more of the possible states based only on their private observations, as when several states result in the same distribution of the private signals. In our model, the agents form some initial belief (probability distribution) about the unknown state and then refine their beliefs in accordance with their private observations, as well as the beliefs of their neighbors. An agent learns the unknown state when her belief converges to a point mass that is concentrated at the true state. A rational agent would use the Bayes' rule to incorporate her neighbors' beliefs and own private signals over time. While such repeated applications of the Bayes' rule in networks can become computationally intractable, in this paper, we show that in the canonical cases of directed star, circle or path networks and their combinations, one can derive a class of memoryless update rules that replicate that of a single Bayesian agent but replace the self beliefs with the beliefs of the neighbors. This way, one can realize an exponentially fast rate of learning similar to the case of Bayesian (fully rational) agents. The proposed rules are a special case of the Learning without Recall.
description: American Control Conference (ACC), 2015
Recurrent mini-outbursts and a magnetic white dwarf in the symbiotic system FN Sgr
Creators: name: Magdolen, J.
name: Dobrotka, A.
name: Orio, M.
name: Mikołajewska, J.
name: Vanderburg, A.
name: Monard, B.
name: Aloisi, R.
name: Bezák, P.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: AIMS: We investigated the optical variability of the symbiotic binary FN Sgr, with photometric monitoring during $\simeq$55 years and with a high-cadence Kepler light curve lasting 81 days. METHODS: The data obtained in the V and I bands were reduced with standard photometric methods. The Kepler data were divided into subsamples and analyses with the Lomb-Scargle algorithm. RESULTS: The V and I band light curves showed a phenomenon never before observed with such recurrence in any symbiotic system, namely short outbursts, starting between orbital phase 0.3 and 0.5 and lasting about a month, with a fast rise and a slower decline, and amplitude of 0.5-1 mag. In the Kepler light curve we discovered three frequencies with sidebands. We attribute a stable frequency of 127.5 d$^{-1}$ (corresponding to an 11.3 minutes period) to the white dwarf rotation. We suggest that this detection probably implies that the white dwarf accretes through a magnetic stream, like in intermediate polars. The small outbursts may be ascribed to the stream-disc interaction. Another possibility is that they are due to localized thermonuclear burning, perhaps confined by the magnetic field, like recently inferred in intermediate polars, albeit on different timescales. We measured also a second frequency around 116.9 d$^{-1}$ (corresponding to about 137 minutes), which is much less stable and has a drift. It may be due to rocky detritus around the white dwarf, but it is more likely to be caused by an inhomogeneity in the accretion disk. Finally, there is a third frequency close to the first one that appears to correspond to the beating between the rotation and the second frequency.
description: Accepted for publication in Astronomy and Astrophysics
Zeta-determinants of Sturm-Liouville operators with quadratic potentials at infinity
Creators: name: Hartmann, Luiz
name: Lesch, Matthias
name: Vertman, Boris
Publisher: name: arXiv
Year: 2016
Subjects: subject: Spectral Theory (math.SP)
subject: FOS: Mathematics
subject: 58J52, 34B24

description: We consider Sturm-Liouville operators on a half line $[a,\infty), a>0$, with potentials that are growing at most quadratically at infinity. Such operators arise naturally in the analysis of hyperbolic manifolds, or more generally manifolds with cusps. We establish existence and a formula for the associated zeta-determinant in terms of the Wronski-determinant of a fundamental system of solutions adapted to the boundary conditions. Despite being the natural objects in the context of hyperbolic geometry, spectral geometry of such operators has only recently been studied in the context of analytic torsion.
description: 31 pages
Deposition and structural characterisation of textured molybdenum disulphide thin films
Creators: name: Jamieson., Ian
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Chemical composition, toxicity and antioxidant activities of essential oils of stem bark of Nigerian species of guava (Psidium guajava Linn.)
Creators: name: Aponjolosun, Babalola S.
name: Fasola, Taiye R.
name: Oloyede, Ganiyat K.
Publisher: name: Technische Universität Dortmund
Year: 2011
Subjects: subject: 1,1-diphenyl-2-picrylhydrazyl
subject: antioxidant
subject: essential oils
subject: GC/GC-MS
subject: Psidium guajava
subject: toxicity
subject: 610

description: Essential oil from the stem bark of Nigerian species of Psidium guajava of the family Myrtaceae was obtained by hydro-distillation using an all-glass Clavenger apparatus. GC and GC/MS analysis were carried out on the essential oil and was found to contain 62 compounds constituting 99.98 % of the total oil composition. The principal constituents are hydrocarbons, amines, amides and esters with 3,6-dioxa-2,4,5,7- etraoctane,2,2,4,4,5,5,7,7-octamethyl (11.67 %) and cyclononane (10.66 %) dominating the total essential oil. Brine shrimp lethality test was carried out to determine the toxicity of the oils to living organisms (shrimps). LC50 value (μg/ml) of 1.0009 obtained showed that the essential oil of P. guajava stem bark was toxic. The antioxidant property of essential oil was investigated by measuring the decrease in absorption at 517 nm of 1,1-diphenyl-2-picrylhydrazyl radical (DPPH) in a UV/visible spectrophotometer. The oil showed better activity as a radical scavenger than α-tocopherol. The oil activity was 71.83 % at 0.2 mg/ml and the absorption is stoichiometric with respect to the number of electron taken up. Thus, the results of this study showed that the essential oil from P. guajava was not only toxic; it possessed antioxidant activity, which could exert beneficial actions against pathological alterations caused by the presence of highly reactive free radicals. The toxicity of the oil can be taken advantage of in the therapy of diseases involving cell or tumor growth.
description: EXCLI Journal ; Vol. 10, 2011
The vascular strategy for the loading and translocation of carbon assimilates in zea mays l. leaves :
Creators: name: James., Kim Rosemary
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Magnitude and Factors Affecting Late Initiation of Antenatal Care Service Utilization among Pregnant Women in Government Health Institutions, Mekelle Town, Ethiopia
Creators: name: Haileselassie, Daniel
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2010

description: Background: Antenatal care is concerned mainly about preventive, early diagnosis and treatment of general medical and pregnancy associated disorders. For it to meaningful, timely initiation is recommended. However, late entry to antenatal care is still a major problem. Pregnant women who do not have timely and appropriate care would be ill-equipped to make choices that will contribute to their own well-being. Assessment of magnitude and factors affecting late initiation of antenatal care among pregnant women in antenatal clinics is helpful for future planning. Objective: To assess the magnitude and factors affecting late initiation of antenatal care service utilization among pregnant women who attended antenatal care clinics in Mekelle town governmental health institutions during the study period. Methodology: Across sectional facility based study was conducted in Mekelle town from February 1, to March 1, 2010 on 419 pregnant women attending antenatal care at government health institutions. Data collection tools were adopted from different literatures, modified to the local context and pre-tested. Face-to-face interview of women were done by trained Nurses. Consecutive sampling technique was employed to select the study subjects. Bivariate analysis was employed to see the association between variables and the final model was constructed using stepwise logistic regression selection method. Ethical clearance was obtained from Ethical committee of Addis Ababa University School of Public health office before starting data collection. Results: Mean ages of the respondents were 26.2 + 5.4 years. Prevalence of late entry to antenatal care was 64.7%. The timing of antenatal care booking ranges from 1st month to 8th months of gestation. The median timing was 4 months (SD 1.6). Multivariate analysis revealed that respondents age, educational status, knowledge on the benefit of ANC to child health, wantedness of pregnancy, and recommended gestational age to start ANC (OR= 0.12, 95% CI: 0.34,0.39),(OR=0.12,95%CI:0.34,0.39),(OR=4.65,95%CI:1.04,20.75),(OR=2.61,95%CI:1.00, 6.77), and (OR=27.49, 95%CI:9.49, 79.64),respectively were found to be independent predictors of initiation time of antenatal care service utilization. Conclusion:- Late booking is still a major problem in this part of the study area. Public health education and reducing unwanted pregnancy would be helpful in reducing the problem.
A 3D Drizzle Algorithm for JWST and Practical Application to the MIRI Medium Resolution Spectrometer
Creators: name: Law, David R.
name: Morrison, Jane E.
name: Argyriou, Ioannis
name: Patapis, Polychronis
name: Alvarez-Marquez, J.
name: Labiano, Alvaro
name: Vandenbussche, Bart
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We describe an algorithm for application of the classic `drizzle' technique to produce 3d spectral cubes using data obtained from the slicer-type integral field unit (IFU) spectrometers on board the James Webb Space Telescope. This algorithm relies upon the computation of overlapping volume elements (composed of two spatial dimensions and one spectral dimension) between the 2d detector pixels and the 3d data cube voxels, and is greatly simplified by treating the spatial and spectral overlaps separately at the cost of just 0.03% in spectrophotometric fidelity. We provide a matrix-based formalism for the computation of spectral radiance, variance, and covariance from arbitrarily dithered data and comment on the performance of this algorithm for the Mid-Infrared Instrument's Medium Resolution IFU Spectrometer (MIRI MRS). We derive a series of simplified scaling relations to account for covariance between cube spaxels in spectra extracted from such cubes, finding multiplicative factors ranging from 1.5 to 3 depending on the wavelength range and kind of data cubes produced. Finally, we discuss how undersampling produces periodic amplitude modulations in the extracted spectra in addition to those naturally produced by fringing within the instrument; reducing such undersampling artifacts below 1% requires a 4-point dithering strategy and spectral extraction radii of 1.5 times the PSF FWHM or greater.
description: 16 pages, 12 figures. Revised version resubmitted to AJ
Nanosecond spin relaxation times in single layer graphene spin valves with hexagonal boron nitride tunnel barriers
Creators: name: Singh, Simranjeet
name: Katoch, Jyoti
name: Xu, Jinsong
name: Tan, Cheng
name: Zhu, Tiancong
name: Amamou, Walid
name: Hone, James
name: Kawakami, Roland
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present an experimental study of spin transport in single layer graphene using atomic sheets of hexagonal boron nitride (h-BN) as a tunnel barrier for spin injection. While h-BN is expected to be favorable for spin injection, previous experimental studies have been unable to achieve spin relaxation times in the nanosecond regime, suggesting potential problems originating from the contacts. Here, we investigate spin relaxation in graphene spin valves with h-BN barriers and observe room temperature spin lifetimes in excess of a nanosecond, which provides experimental confirmation that h-BN is indeed a good barrier material for spin injection into graphene. By carrying out measurements with different thicknesses of h-BN, we show that few layer h-BN is a better choice than monolayer for achieving high non-local spin signals and longer spin relaxation times in graphene.
description: 22 pages, 4 figures and supplementary material, [accepted for publication in Applied Physics Letters]
Εκθεσιακός Σχεδιασμός για το Μουσείο Ελληνικής Δισκογραφίας, στο διατηρητέο κτίριο Columbia, στην Αθήνα. Προγραμματισμός και Προκαταρκτική Μουσειογραφική Πρόταση
Creators: name: Φουτσιτζόγλου, Ελισσάβετ Αγγελική Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2022
Subjects: Εκθεσιακός σχεδιασμός
Προγραμματισμός
Μουσείο ελληνικής δισκογραφίας
Exhibition Design
Museography
Greek Discography museum

description: Aντικείμενο της παρούσας Διπλωματικής Εργασίας είναι ο Προγραμματισμός και ο Χωρικός Μουσειολογικός Σχεδιασμός της Μόνιμης ‘Εκθεσης για το Μουσείο Ελληνικής Δισκογραφίας, στο διατηρητέο κτίσμα Columbia στον Περισσό Aττικής. Στόχος της εργασίας είναι η σύνταξη σε επίπεδο Προκαταρκτικής μελέτης, μιας κεντρικής χωρικής ιδέας που ακολουθεί το σκεπτικό του Νοηματικού Μουσειολογικού Σκεπτικού της Μουσειολογικής Ομάδας υπό την επίβλεψη της ομ. καθηγήτριας Ματούλας Σκαλτσά. Στο Α’ μέρος της εργασίας, καταγράφεται ο Χωρικός Μουσειολογικός Προγραμματισμός, ο οποίος βασίστηκε στα δεδομένα που παραλήφθηκαν από τον Νοηματικό, ενώ στο Β’ μέρος, ακολουθεί η πρόταση του Χωρικού-Μουσειολογικού Σχεδιασμού.
description: The subject of this thesis is the spatial museological planning of the permanent exhibition for the Museum of Greek Diskography, in the preserved building of Columbia Records, in Perissos, Athens. Τhe aim of this work is the preparation in a preliminary level study and the configuration of a spatial main idea, that will follow the conceptual museological planning of the museological team under the supervision of Matoula Scaltsa. The first part (A), presents the spatial planning through the given data from the Conceptual Planning and data analysis, while the second part (B), follows the drawings of the spatial design proposal.
description: Σε συνεργασία με: Παιδαγωγικό Δημοτικής Εκπαίδευσης (Πανεπιστήμιο Δυτικής Μακεδονίας)
Designing a Mobile High-Fidelity AR Prototype Application for Museums as a Tour Guide for Deaf people: Perceptions and Evaluations
Creators: name: Πάλλα, Ζωή Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2022
Subjects: Ψηφιακά Μέσα
Ψηφιακή Επικοινωνία
Σχεδιασμός Εφαρμογής
Digital Media
Digital Communication
Application Prototyping

description: Museums and other cultural centers are considered as open spaces, that encourage the active participation of all visitors. However, it is quite challenging for museums to take into consideration and communicate the multi-layered needs of their visitors. As a consequence, a lot of visitors run into accessibility obstacles, which keep them out from taking part in the museum programs and activities. The purpose of this paper is to explore the potential of new technology practices within the museum as part of a marketing strategy aimed at improving the visit experience for the hearing impaired. For this reason, topics are reviewed in detail and case studies are designed, presented, and analyzed. An important part of the design is the creation of a high-fidelity AR application prototype, called "Sign Art". Prototype design allows you to explore the evaluation and recognition of the arts of hearing-impaired users, museum experiences, and the implementation of digital practices in the areas of cultural creation, including the disabled. In addition, this study explores the potential existence of other similar applications and attempts to involve the Deaf community in cultural events and activities.
description: Τα μουσεία και άλλα πολιτιστικά κέντρα θεωρούνται ως ανοιχτοί χώροι, που ενθαρρύνουν την ενεργό συμμετοχή όλων των επισκεπτών. Ωστόσο, είναι αρκετά δύσκολο για τα μουσεία να λαμβάνουν υπόψη και να επικοινωνούν τις πολυεπίπεδες ανάγκες των επισκεπτών τους. Κατά συνέπεια, πολλοί επισκέπτες αντιμετωπίζουν εμπόδια προσβασιμότητας, τα οποία τους εμποδίζουν να λάβουν μέρος στα προγράμματα και τις δραστηριότητες του μουσείου. Σκοπός αυτής της εργασίας είναι να διερευνήσει τις δυνατότητες των νέων τεχνολογικών πρακτικών εντός του μουσείου ως μέρος μιας στρατηγικής μάρκετινγκ που στοχεύει στη βελτίωση της εμπειρίας επίσκεψης για άτομα με προβλήματα ακοής. Για το λόγο αυτό, τα θέματα εξετάζονται λεπτομερώς, σχεδιάζονται, παρουσιάζονται και αναλύονται περιπτωσιολογικές μελέτες. Ένα σημαντικό μέρος του σχεδιασμού είναι η δημιουργία ενός πρωτοτύπου εφαρμογής AR που ονομάζεται «Sign Art». Ο σχεδιασμός πρωτοτύπων AR επιτρέπει την αξιολόγηση και την αναγνώριση των τεχνών από τους χρήστες με προβλήματα ακοής, τις εμπειρίες μουσείων και την εφαρμογή ψηφιακών πρακτικών στους τομείς της πολιτιστικής δημιουργίας, συμπεριλαμβανομένων των ατόμων με αναπηρία. Επιπλέον, αυτή η μελέτη διερευνά την πιθανή ύπαρξη άλλων παρόμοιων εφαρμογών και προσπαθεί να εμπλέξει την κοινότητα των Κωφών σε πολιτιστικές εκδηλώσεις και δραστηριότητες.
Shape-based clustering of synthetic Stokes profiles using k-means and k-Shape
Creators: name: Moe, Thore Espedal
name: Pereira, Tiago M. D.
name: Calvo, Flavio
name: Leenaarts, Jorrit
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The shapes of Stokes profiles contain much information about the atmospheric conditions that produced them. However, a variety of different atmospheric structures can produce very similar profiles. Thus, it is important for proper interpretation of observations to have a good understanding of how the shapes of Stokes profiles depend on the underlying atmosphere. An excellent tool in this regard is forward modeling, i.e. computing and studying synthetic spectra from realistic simulations of the solar atmosphere. Modern simulations routinely produce several hundred thousand spectral profiles per snapshot. With such numbers, it becomes necessary to use automated procedures in order to organize the profiles according to their shape. Here we illustrate the use of two complementary methods, k-means and k-Shape, to cluster similarly shaped profiles, and demonstrate how the resulting clusters can be combined with knowledge of the simulation's atmosphere to interpret spectral shapes. We generate synthetic Stokes profiles for the Ca II 854.2 nm line using the Multi3D code from a Bifrost simulation snapshot. We then apply the k-means and k-Shape clustering techniques to group the profiles together according to their shape. We show and compare the classes of profile shapes we retrieve from applying both k-means and k-Shape to our synthetic intensity spectra. We then show the structure of the underlying atmosphere for two particular classes of profile shapes retrieved by the clustering, and demonstrate how this leads to an interpretation for the formation of those profile shapes. Furthermore, we apply both methods to the subset of our profiles containing the strongest Stokes V signals, and demonstrate how k-Shape can be qualitatively better than k-means at retrieving complex profile shapes when using a small number of clusters.
description: 12 pages, 9 figures. Accepted for publication in A&A. Abstract abridged for Arxiv
Detektion flüchtiger organischer Verbindungen mittels Ionenmobilitätsspektrometrie und deren Kopplung mit Multi-Kapillar-Gas-Chromatographie
Creators: name: Sielemann, Stefanie
Publisher: name: Universität Dortmund
Year: 2000
Subjects: subject: Ionenmobilitätsspektrometrie
subject: IMS
subject: Gaschromatographie
subject: GC
subject: Multi-Kapillar-Säule
subject: MCC
subject: VOC
subject: Flüchtige organische Verbindungen
subject: 540

description: Die Ionenmobilitätsspektrometrie zeichnet sich durch niedrige Detektionsgrenzen (unterer ppb-Bereich), kurze Analysenzeiten (ms-Bereich) und selektive Detektierbarkeit unterschiedlicher chemischer Substanzklassen bei Umgebungsdruck aus. Ionenmobilitätsspektrometer (IMS) mit unterschiedlichen Ionisationsquellen (radioaktive Strahlungsquellen, UV-Strahlungsquellen) wurden für die qualitative Detektion flüchtiger organischer Verbindungen (VOC) eingesetzt, um Kenntnisse über die reduzierten Mobilitäten der hierbei erzeugten Ionen in Abhängigkeit von ihrer chemischen Substanzklasse zu gewinnen. Mittels geeigneter Testgasquellen wurden die IMS für einzelne, nach Kopplung mit Multi-Kapillarsäulen (MCC) auch für Gemische von VOC kalibriert, wobei Nachweisgrenzen im Bereich von einigen wenigen ppb erreicht worden sind. Das entwickelte Meßsystem konnte unter anderem für die Bestimmung von Aromaten in industriellem Prozeßabwasser eingesetzt werden.
Entanglement Growth after a Global Quench in Free Scalar Field Theory
Creators: name: Cotler, Jordan S.
name: Hertzberg, Mark P.
name: Mezei, Márk
name: Mueller, Mark T.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We compute the entanglement and Rényi entropy growth after a global quench in various dimensions in free scalar field theory. We study two types of quenches: a boundary state quench and a global mass quench. Both of these quenches are investigated for a strip geometry in 1, 2, and 3 spatial dimensions, and for a spherical geometry in 2 and 3 spatial dimensions. We compare the numerical results for massless free scalars in these geometries with the predictions of the analytical quasiparticle model based on EPR pairs, and find excellent agreement in the limit of large region sizes. At subleading order in the region size, we observe an anomalous logarithmic growth of entanglement coming from the zero mode of the scalar.
description: v2: references added, minor improvements; v1: 32 pages, 9 figures
Αλκαλική υδρόλυση μειγμάτων PET/PLA με τη χρήση μικροκυματικής ακτινοβολίας
Creators: name: Γναρδέλλης, Δημήτριος Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2022
Subjects: Χημική ανακύκλωση PET/PLA
Αλκαλική υδρόλυση
Μικροκυματική ακτινοβολία
PET/PLA chemical recycling
Alkaline hydrolysis
Microwave irradiation

description: Στην παρούσα εργασία μελετήθηκε ο αποπολυμερισμός μείγματος συμβατικών πολυμερών με βιοδιασπώμενα πολυμερή. Συγκεκριμένα χρησιμοποιήθηκαν o πολυ(τερεφθαλικός αιθυλενεστέρας) (PET) ως συμβατικό πολυμερές και το πολυ(γαλακτικό οξύ) από την οικογένεια των βιοδιασπώμενων πολυμερών. Η διάσπαση των πολυμερών έλαβε χώρα με τη διαδικασία της αλκαλικής υδρόλυσης, με τη βοήθεια μικροκυματικής ακτινοβολίας. Στόχος της εργασίας είναι να μελετήσουμε πως επηρεάζει η ύπαρξη του ενός πολυμερούς τη διάσπαση του άλλου καθώς και να εξετάσουμε την επίδραση των συνθηκών αντίδρασης στο σύστημά μας. Οι παράμετροι που εξετάστηκαν ήταν ο χρόνος αντίδρασης, η θερμοκρασία στην οποία έλαβε χώρα ο αντίδραση, ο καταλύτης μεταφοράς φάσης που χρησιμοποιήθηκε και η συγκέντρωση του αλκαλικού διαλύματος που χρησιμοποιήθηκε. Βρέθηκε ότι με την αύξηση της θερμοκρασίας επιτυγχάνεται και αύξηση της απόδοσης, με βέλτιστη θερμοκρασία τους 150 oC, ενώ με αύξηση του χρόνου αντίδρασης αυξάνεται και η απόδοση της διάσπασης, με βέλτιστο χρόνο αντίδρασης τα 10 λεπτά. Η καλύτερη συγκέντρωση αλκαλικού διαλύματος βρέθηκε ότι είναι 10% w/v και ο καλύτερος καταλύτης μεταφοράς φάσης είναι ο Hexadecyltrimethylammonium bromide (HTMAB).
description: In the present study, the chemical recycling of blends containing conventional and biodegradable polymers was studied. To be more specific, the poly(ethylene terephthalate) was used as conventional polymer and the poly(lactic acid) was used as biodegradable polymer. The depolymerization was achieved through alkaline hydrolysis of the blend, catalyzed by phase transfer catalysts under microwave irradiation. The purpose of this study was not only to determine how the presence of one polymer in the blend affects the depolymerization of the other one but also to find out how the reaction’s conditions affect the process. The conditions studied were the influence of time and temperature, the presence or absence of catalyst and the degree of alkalinity of the solution that was used. It was found that by increasing the reaction’s temperature we achieve a higher reaction’s yield and the recommended reaction’s temperature is 150 oC. In a similar way the time of reaction works, as it was found that when we increase the time of reaction, the reaction’s yield is increased as well. Finally, we found that we have better results when we use 10% w/v NaOH(aq) and Hexadecyltrimethylammonium bromide (HTMAB) as phase transfer catalyst.
Evaluating short- and long-term impacts of a Medicaid “lock-in” program on opioid and benzodiazepine prescriptions dispensed to beneficiaries
Creators: name: Naumann, R.B.
name: Marshall, S.W.
name: Skinner, A.C.
name: Ringwalt, C.L.
name: Lund, J.L.
name: Gottfredson, N.C.
Publisher: name: Elsevier Ireland Ltd
Year: 2018

description: Background Insurance-based “lock-in” programs (LIPs) have become a popular strategy to address controlled substance (CS) (e.g., opioid) misuse. However, little is known about their impacts. We examined changes in CS dispensing to beneficiaries in the 12-month North Carolina Medicaid LIP. Methods We analyzed Medicaid claims linked to Prescription Drug Monitoring Program (PDMP) records for beneficiaries enrolled in the LIP between October 2010 and September 2012 (n = 2702). Outcomes of interest were 1) number of dispensed CS prescriptions and 2) morphine milligram equivalents (MMEs) of dispensed opioids while a) locked-in and b) in the year following release. Results Compared to a period of stable CS dispensed prior to LIP enrollment, numbers of dispensed CS during lock-in and post-release were lower (count difference per person-month: −0.05 (95% CI: −0.11, 0.01); −0.23 (95% CI: −0.31, −0.15), respectively). However, beneficiaries’ average daily MMEs of opioids were elevated during both lock-in and post-release (daily mean difference per person: 18.7 (95% CI: 13.9, 23.6); 11.1 (95% CI: 5.1, 17.1), respectively). Stratification by payer source revealed increases in using non-Medicaid (e.g., out-of-pocket) payment during lock-in that persisted following release. Conclusion While the LIP reduced the number of CS dispensed, the program was also associated with increased acquisition of CS prescriptions using non-Medicaid payment. Moreover, beneficiaries acquired greater dosages of dispensed opioids from both Medicaid and non-Medicaid payment sources during lock-in and post-release. Refining LIPs to increase beneficiary access to substance use disorder screening and treatment services and provider use of PDMPs may address important unintended consequences.
Our mutual friend, no. 08
Creators: name: Dickens, Charles, 1812-1870
Publisher: name: University of Victoria Libraries
Year: 2018
Subjects: subject: Inheritance and succession
valueUri: http://id.worldcat.org/fast/973371
subject: Social classes
valueUri: http://id.worldcat.org/fast/1122346
subject: Social conflict
valueUri: http://id.worldcat.org/fast/1122378
subject: Families
valueUri: http://id.worldcat.org/fast/1728849

description: Last complete novel completed by Charles Dickens and is one of his most sophisticated works, combining savage satire with social analysis. In the opening chapters a body is found in the Thames and identified as that of John Harmon, a young man recently returned to London to receive his inheritance. Were he alive, his father's will would require him to marry Bella Wilfer, a beautiful, mercenary girl whom he had never met. Instead, the money passes to the working-class Boffins, and the effects spread into various corners of London society. Issued monthly from May 1864 to November 1865 in illustrated green paper covers. Chapters 7-10: Chapter 7. In which a friendly move is originated -- Chapter 8. In which an innocent elopement occurs -- Chapter 9. In which the orphan makes his will -- Chapter 10. A successor
Synthetic approaches to a potential metabolite oestriol
Creators: name: James., Alison M.
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Removal of carbon dioxide from gas streams with metal oxides at high temperature
Creators: name: Jahan., Mursheda
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Dynamics of coupled oscillator systems in presence of a local potential
Creators: name: Campa, Alessandro
name: Gupta, Shamik
Publisher: name: arXiv
Year: 2016
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We consider a long-range model of coupled phase-only oscillators subject to a local potential and evolving in presence of thermal noise. The model is a non-trivial generalization of the celebrated Kuramoto model of collective synchronization. We demonstrate by exact results and numerics a surprisingly rich long-time behavior, in which the system settles into either a stationary state that could be in or out of equilibrium and supports either global synchrony or absence of it, or, in a time-periodic synchronized state. The system shows both continuous and discontinuous phase transitions, as well as an interesting reentrant transition in which the system successively loses and gains synchrony on steady increase of the relevant tuning parameter.
description: v2: close to the published version
Three-dimensional structure and stability of discontinuities between unmagnetized pair plasma and magnetized electron-proton plasma
Creators: name: Dieckmann, M E
name: Folini, D
name: Falk, M
name: Bock, A
name: Steneteg, P
name: Walder, R
Publisher: name: arXiv
Year: 2023
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We study with a 3D PIC simulation discontinuities between an electron-positron pair plasma and magnetized electrons and protons. A pair plasma is injected at one simulation boundary with a speed 0.6$c$ along its normal. It expands into an electron-proton plasma and a magnetic field that points orthogonally to the injection direction. Diamagnetic currents expel the magnetic field from within the pair plasma and pile it up in front of it. It pushes electrons, which induces an electric field pulse ahead of the magnetic one. This initial electromagnetic pulse (EMP) confines the pair plasma magnetically and accelerates protons electrically. The fast flow of the injected pair plasma across the protons behind the initial EMP triggers the filamentation instability. Some electrons and positrons cross the injection boundary and build up a second EMP. Electron-cyclotron drift instabilities perturb the plasma ahead of both EMPs seeding a Rayleigh-Taylor-type instability. Despite equally strong perturbations ahead of both EMPs, the second EMP is much more stable than the initial one. We attribute the rapid collapse of the initial EMP to the filamentation instability, which perturbed the plasma behind it. The Rayleigh-Taylor-type instability transforms the planar EMPs into transition layers, in which magnetic flux ropes and electrostatic forces due to uneven numbers of electrons and positrons slow down and compress the pair plasma and accelerate protons. In our simulation, the expansion speed of the pair cloud decreased by about an order of magnitude and its density increased by the same factor. Its small thickness implies that it is capable of separating a relativistic pair outflow from an electron-proton plasma, which is essential for collimating relativistic jets of pair plasma in collisionless astrophysical plasma.
description: 25 pages, 12 figures, provisionally accepted for publication by the New Journal of Physics
EXPRES IV: Two Additional Planets Orbiting $ρ$ Coronae Borealis Reveal Uncommon System Architecture
Creators: name: Brewer, John M.
name: Zhao, Lily L.
name: Fischer, Debra A.
name: Roettenbacher, Rachael M.
name: Henry, Gregory W.
name: Llama, Joe
name: Szymkowiak, Andrew E.
name: Cabot, Samuel H. C.
name: Weiss, Sam A.
name: McCarthy, Chris
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Thousands of exoplanet detections have been made over the last twenty-five years using Doppler observations, transit photometry, direct imaging, and astrometry. Each of these methods is sensitive to different ranges of orbital separations and planetary radii (or masses). This makes it difficult to fully characterize exoplanet architectures and to place our solar system in context with the wealth of discoveries that have been made. Here, we use the EXtreme PREcision Spectrograph (EXPRES) to reveal planets in previously undetectable regions of the mass-period parameter space for the star $ρ$ Coronae Borealis. We add two new planets to the previously known system with one hot Jupiter in a 39-day orbit and a warm super-Neptune in a 102-day orbit. The new detections include a temperate Neptune planet ($M{\sin{i}} \sim 20$ M$_\oplus$) in a 281.4-day orbit and a hot super-Earth ($M{\sin{i}} = 3.7$ M$_\oplus$) in a 12.95-day orbit. This result shows that details of planetary system architectures have been hiding just below our previous detection limits; this signals an exciting era for the next generation of extreme precision spectrographs.
description: Accepted to AJ; 20 pages, 13 figures, 5 Tables
Collaborative Robotic Biopsy with Trajectory Guidance and Needle Tip Force Feedback
Creators: name: Mieling, Robin
name: Neidhardt, Maximilian
name: Latus, Sarah
name: Stapper, Carolin
name: Gerlach, Stefan
name: Kniep, Inga
name: Heinemann, Axel
name: Ondruschka, Benjamin
name: Schlaefer, Alexander
Publisher: name: arXiv
Year: 2023
Subjects: subject: Robotics (cs.RO)
subject: Machine Learning (cs.LG)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The diagnostic value of biopsies is highly dependent on the placement of needles. Robotic trajectory guidance has been shown to improve needle positioning, but feedback for real-time navigation is limited. Haptic display of needle tip forces can provide rich feedback for needle navigation by enabling localization of tissue structures along the insertion path. We present a collaborative robotic biopsy system that combines trajectory guidance with kinesthetic feedback to assist the physician in needle placement. The robot aligns the needle while the insertion is performed in collaboration with a medical expert who controls the needle position on site. We present a needle design that senses forces at the needle tip based on optical coherence tomography and machine learning for real-time data processing. Our robotic setup allows operators to sense deep tissue interfaces independent of frictional forces to improve needle placement relative to a desired target structure. We first evaluate needle tip force sensing in ex-vivo tissue in a phantom study. We characterize the tip forces during insertions with constant velocity and demonstrate the ability to detect tissue interfaces in a collaborative user study. Participants are able to detect 91% of ex-vivo tissue interfaces based on needle tip force feedback alone. Finally, we demonstrate that even smaller, deep target structures can be accurately sampled by performing post-mortem in situ biopsies of the pancreas.
description: Presented at ICRA 2023
A Potential Model Approach in the Study of Static and Dynamic properties of Heavy-Light Quark-Antiquark Systems
Creators: name: Roy, Sabyasachi
name: Choudhury, D K
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We report some approximate analytic form of meson wave function constructed upon solving Schrodinger equation with linear plus Coulomb type Cornell potential. With this wave function, we study Isgur-Wise function and its derivatives for heavy-light mesons in the infinite heavy quark mass limit. We also explore the elastic form factors, charge radii and decay constants of pseudoscalar mesons in this QCD inspired quark model approach.
Controlling for frailty in pharmacoepidemiologic studies of older adults
Creators: name: Kucharska-Newton, A.
name: Thai, S.
name: Faurot, K.R.
name: Stürmer, T.
name: Windham, B.G.
name: Jonsson Funk, M.
name: Palta, P.
name: Lund, J.L.
name: Cuthbertson, C.C.
Publisher: name: Lippincott Williams and Wilkins
Year: 2018

description: Background: Frailty is a geriatric syndrome characterized by weakness and weight loss and is associated with adverse health outcomes. It is often an unmeasured confounder in pharmacoepidemiologic and comparative effectiveness studies using administrative claims data. Methods: Among the Atherosclerosis Risk in Communities (ARIC) Study Visit 5 participants (2011-2013; n = 3,146), we conducted a validation study to compare a Medicare claims-based algorithm of dependency in activities of daily living (or dependency) developed as a proxy for frailty with a reference standard measure of phenotypic frailty. We applied the algorithm to the ARIC participants' claims data to generate a predicted probability of dependency. Using the claims-based algorithm, we estimated the C-statistic for predicting phenotypic frailty. We further categorized participants by their predicted probability of dependency (<5%, 5% to <20%, and ≥20%) and estimated associations with difficulties in physical abilities, falls, and mortality. Results: The claims-based algorithm showed good discrimination of phenotypic frailty (C-statistic = 0.71; 95% confidence interval [CI] = 0.67, 0.74). Participants classified with a high predicted probability of dependency (≥20%) had higher prevalence of falls and difficulty in physical ability, and a greater risk of 1-year all-cause mortality (hazard ratio = 5.7 [95% CI = 2.5, 13]) than participants classified with a low predicted probability (<5%). Sensitivity and specificity varied across predicted probability of dependency thresholds. Conclusions: The Medicare claims-based algorithm showed good discrimination of phenotypic frailty and high predictive ability with adverse health outcomes. This algorithm can be used in future Medicare claims analyses to reduce confounding by frailty and improve study validity.
title: Serum leptin changes with metformin treatment in polycystic ovarian syndrome
title: correlation with ovulation, insulin and testosterone levels
titleType: AlternativeTitle
Creators: name: Rehan, H. S.
name: Seth, Vikas
name: Upadhyaya, Prerna
Publisher: name: Technische Universität Dortmund
Year: 2011
Subjects: subject: insulin
subject: leptin
subject: metformin
subject: ovulation
subject: PCOS
subject: testosterone
subject: 610

description: The relationship between leptin, insulin resistance and other hormonal parameters in polycystic ovarian syndrome (PCOS) is controversial. We investigated the effect of metformin on leptin levels in women with PCOS. Thirty women with PCOS received metformin 500 mg thrice a day. After two months of metformin treatment the mean leptin levels reduced significantly (p < 0.001). Ovulation was achieved in 28 patients, who also had a significant reduction in leptin levels (p < 0.001). Leptin showed significant positive correlation with weight (p < 0.05) and testosterone (p < 0.01), but no significant correlation with insulin. It is concluded that metformin reduces leptin resistance in PCOS women which induces ovulation. Leptin shows a significant correlation with testosterone and not with insulin.
description: EXCLI Journal ; Vol. 10, 2011
Shock evolution in non-radiative supernova remnants
Creators: name: Tang, Xiaping
name: Chevalier, Roger A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present a new analytical approach to derive approximate solutions describing the shock evolution in non-radiative supernova remnants (SNRs). We focus on the study of the forward shock and contact discontinuity while application to the reverse shock is only discussed briefly. The spherical shock evolution of a SNR in both the interstellar medium with a constant density profile and a circumstellar medium with a wind density profile is investigated. We compared our new analytical solution with numerical simulations and found that a few percent accuracy is achieved. For the evolution of the forward shock, we also compared our new solution to previous analytical models. In a uniform ambient medium, the accuracy of our analytical approximation is comparable to that in Truelove&McKee (1999). In a wind density profile medium, our solution performs better than that in Micelotta et al. (2016), especially when the ejecta envelope has a steep density profile. The new solution is significantly simplified compared to previous analytical models, as it only depends on the asymptotic behaviors of the remnant during its evolution.
description: Add discussion for contact discontinuity