cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Mn L$_{2,3}$ edge resonant x-ray scattering in manganites: Influence of the magnetic state
Creators: name: Stojić, N.
name: Binggeli, N.
name: Altarelli, M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present an analysis of the dependence of the resonant orbital order and magnetic scattering spectra on the spin configuration. We consider an arbitrary spin direction with respect to the local crystal field axis, thus lowering significantly the local symmetry. To evaluate the atomic scattering in this case, we generalized the Hannon-Trammel formula and implemented it inside the framework of atomic multiplet calculations in a crystal field. For an illustration, we calculate the magnetic and orbital scattering in the CE phase of \lsmo in the cases when the spins are aligned with the crystal lattice vector ${\vec a}$ (or equivalently ${\vec b}$) and when they are rotated in the $ab$-plane by 45$^{\circ}$ with respect to this axis. Magnetic spectra differ for the two cases. For the orbital scattering, we show that for the former configuration there is a non negligible $σ\to σ'$ ($π\to π'$) scattering component, which vanishes in the 45$^\circ$ case, while the $σ\to π'$ ($π\to σ'$) components are similar in the two cases. From the consideration of two 90$^\circ$ spin canted structures, we conclude there is a significant dependence of the orbital scattering spectra on the spin arrangement. Recent experiments detected a sudden decrease of the orbital scattering intensity upon increasing the temperature above the N\' eel temperature in \lsmo. We discuss this behavior considering the effect of different types of misorientations of the spins on the orbital scattering spectrum.
description: 8 figures. In the revised version, we added a note, a reference, and a few minor changes in Figure 1 and the text. Accepted in Physical Review B
Photon Mixing in Domain Walls and the Cosmic Coincidence Problem
Creators: name: Evslin, Jarah
name: Fairbairn, Malcolm
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A model is presented where there exists another U(1) gauge group which is extremely weakly coupled to that of QED except inside the core of domain walls. It is possible to choose parameters such that standard model photons crossing such a wall are mixed maximally with the 'para-photons' of the other U(1). We use this model to explain the apparent low luminosity of high redshift supernovae. A possible mechanism is outlined where the domain walls correspond to changes in the relative orientation of branes in a compact space. The model is rather contrived but has the advantage that for a wide range of values it can solve the cosmic coincidence problem - an observer at any redshift would come to the conclusion that their universe had recently started to accelerate.
description: 4 pages, 3 figs h
Quantum Dialogue by Using the GHZ State
Creators: name: Xia, Yan
name: Fu, Chang-Bao
name: Zhang, Shou
name: Hong, Suc-Kyoung
name: Yeon, Kyu-Hwang
name: Um, Chung-In
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a quantum dialogue protocol by using the Greenberger-Horne-Zeilinger (GHZ) state. In this paper, we point out that the `quantum dialogue' communication scheme recently introduced by Nguyen can be eavesdropped on under an intercept-and-resend attack. We also give a revised control mode to detect this attack. Hence, within the present version two users can exchange their secret messages securely and simultaneously, and the efficiency of information transmission can be successfully increased.
Automatic Generation of Topic Labels
Creators: name: Alokaili, Areej
name: Aletras, Nikolaos
name: Stevenson, Mark
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: Topic modelling is a popular unsupervised method for identifying the underlying themes in document collections that has many applications in information retrieval. A topic is usually represented by a list of terms ranked by their probability but, since these can be difficult to interpret, various approaches have been developed to assign descriptive labels to topics. Previous work on the automatic assignment of labels to topics has relied on a two-stage approach: (1) candidate labels are retrieved from a large pool (e.g. Wikipedia article titles); and then (2) re-ranked based on their semantic similarity to the topic terms. However, these extractive approaches can only assign candidate labels from a restricted set that may not include any suitable ones. This paper proposes using a sequence-to-sequence neural-based approach to generate labels that does not suffer from this limitation. The model is trained over a new large synthetic dataset created using distant supervision. The method is evaluated by comparing the labels it generates to ones rated by humans.
description: Short paper accepted at SIGIR '20
Μοντελοποίηση της ενεργειακής ζήτησης στον οικιακό τομέα της Ελλάδας
Creators: name: Γαϊτανάρου, Αφροδίτη
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2021
Subjects: subject: Οικιακός τομέας
subject: Μοντελοποίηση ενεργειακής ζήτησης
subject: Ζήτηση ενέργειας
subject: Residential sector
subject: Energy demand
subject: Demand-side management
subject: Energy system modeling

description: Η αυξανόμενη διείσδυση των ανανεώσιμων πηγών ενέργειας στο ενεργειακό μίγμα και η διαχείριση της συνολικής ζήτησης ενέργειας διαδραματίζουν καθοριστικό ρόλο για την ενεργειακή μετάβαση που αναδιαμορφώνει ουσιαστικά το ηλεκτρικό σύστημα. Μια σημαντική πρόκληση στην πορεία μας τέτοιας μετάβασης είναι η ενσωμάτωση και απορρόφηση αυξημένων ποσοτήτων ενέργειας προερχόμενη από στοχαστικές, ανανεώσιμες πηγές, χωρίς να τίθεται σε κίνδυνο η ασφάλεια και η αξιοπιστία του ηλεκτρικού συστήματος. Για το σκοπό αυτό, η εισαγωγή τεχνολογιών και πρακτικών διαχείρισης ζήτησης αποτελεί βασική λύση. Για να εκτιμήσουμε τον αντίκτυπο της εφαρμογής τέτοιων τεχνολογιών, είναι απαραίτητο να κατανοήσουμε πλήρως τις πολλαπλές πτυχές τους σε ενεργειακό επίπεδο και οποιωνδήποτε άλλων απαιτήσεων χρήσης ενέργειας στον οικιακό τομέα. Αυτή η ολιστική προσέγγιση είναι απαραίτητη για να συλλάβουμε πλήρως τις επιπτώσεις της σύμπτωσης των ενεργειακών απαιτήσεων σε διάφορες χρήσεις εντός μιας οικίας, αλλά και στο σύνολό τους. Ως αποτέλεσμα, η μοντελοποίηση της ζήτησης ενέργειας και η κατανόηση των προφίλ κατανάλωσης στον οικιακό τομέα είναι ζωτικής σημασίας για την ποσοτικοποίηση των πλεονεκτημάτων των τεχνολογιών και πρακτικών διαχείρισης ζήτησης, ειδικά με γνώμονα τους εθνικούς στόχους, στο πλαίσιο των ευρωπαϊκών προσπαθειών για επίτευξη κλιματικής ουδετερότητας έως το 2050. Υπό αυτό το πρίσμα, σκοπός της παρούσας διπλωματικής εργασίας είναι να μοντελοποιήσει την ενεργειακή ζήτηση στον οικιακό τομέα της Ελλάδας. Για να γίνει αυτό, χρησιμοποιείται το υπολογιστικό εργαλείο υψηλής ευκρίνειας «DREEM» (Dynamic high-Resolution dEmand-sidE Management), που παραμετροποιείται σύμφωνα με τα διαθέσιμα ερευνητικά και δημογραφικά δεδομένα για τον οικιακό τομέα της Ελλάδας. Τα αποτελέσματα δείχνουν την ικανότητα του μοντέλου να απεικονίζει με ακρίβεια τα προφίλ ζήτησης για ελληνικές κατοικίες, επισημαίνοντας τις κορυφές φορτίου, για τις τέσσερις διαφορετικές κλιματικές ζώνες στην Ελλάδα, λαμβάνοντας υπόψη τις διαφορετικές καιρικές συνθήκες και/ή τα διαφορετικά προφίλ συμπεριφοράς και πληρότητας των κατοίκων. Συνολικά, η παρούσα διατριβή επιδιώκει να αποδώσει μια πρώτη εικόνα της μοντελοποίησης της ενεργειακής ζήτησης που είναι απαραίτητη σε μια σειρά προσπαθειών για τον ποσοτικό προσδιορισμό του αντίκτυπου εφαρμογής διαφορετικών μέτρων ενεργειακής απόδοσης με σκοπό την επίτευξη των αντίστοιχων εθνικών στόχων έως το 2030, παρέχοντας παράλληλα συγκεκριμένες προτάσεις και χρήσιμες πληροφορίες σε ενδιαφερόμενα μέρη από το χώρο σχεδιασμού και χάραξης πολιτικών.
Testing gravity with the Milky Way: Yukawa potential
Creators: name: Henrichs, Jakob
name: Lembo, Margherita
name: Iocco, Fabio
name: Amendola, Luca
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We test a Yukawa correction to the Newtonian potential, making use of our own Galaxy - the Milky Way - as a testbed. We include as free parameter the Yukawa strength and range and the dark matter profile parameters, and compare several morphologies for the bulge, gas, and disk components, also using Bayesian model selection criteria. We employ up-to-date datasets for both the visible (baryonic) component of the Milky Way, and for the tracers of the gravitational potential (the Rotation Curve). We find that the data are consistent with the Newtonian potential, and constrain the Yukawa coupling $β$ to be negative and $λ$ to range along the curve $λ= a|β|^{c}$ with $a = (0.77 \pm 0.06)$ kpc and $c = -0.503\substack{+0.016 \\ -0.019}$.
description: 27 pages, 16 figures, minor changes to reflect the accepted version
title: Association between the CD40 rs1883832 polymorphism and Graves' disease risk
title: a meta-analysis
titleType: AlternativeTitle
Creators: name: Wang, Xiao-Xiong
name: Wang, Xiao-Xia
name: Chen, Tong
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: CD40
subject: Graves’ disease
subject: Meta-analysis
subject: Polymorphism
subject: 610

description: This meta-analysis aims to evaluate whether the CD40 rs1883832 polymorphism is associated with Graves’ disease (GD) risk in different populations. We performed a systematic literature search in China National Knowledge Infrastructure (CNKI), Web of Science, and Pubmed databases to identify case-control association studies on the association between rs1883832 and GD risk. For each study we calculated the odds ratios (OR) and 95 % confidence intervals (CI) assuming dominant, recessive and homozygote models. We then calculated pooled ORs and 95 % CIs. After applying inclusion and exclusion criteria, 17 studies involving 4707 cases and 4215 controls were included in the meta-analysis. The results showed that rs1883832 was associated with GD risk in Asians under dominant (CT + TT vs CC, OR=0.67, 95 % CI: 0.56-0.81, P<0.001), recessive (TT vs CT + CC, OR=0.58, 95 % CI: 0.47-0.72, P<0.001), and homozygote (TT vs CC, OR=0.49, 95 % CI: 0.37-0.64, P<0.001) models. In Caucasians, rs1883832 was associated with GD risk under the dominant model (CT + TT vs CC, OR=0.82, 95 % CI: 0.68-0.99, P=0.042). Besides GD, we evaluated the relation of rs1883832 with Graves’ ophthalmopathy (GO), finding that rs1883832 was associated with GO under the dominant model (CT + TT vs CC, OR=0.82, 95 % CI: 0.69-0.98, P=0.031). The findings of our meta-analysis suggest that the CD40 rs1883832 polymorphism is protective against GD and GO in Asians and Caucasians.
description: EXCLI Journal;Vol. 18 2019
Μελέτη και αξιολόγηση λειτουργίας τηλεφωνικού κέντρου. Προτάσεις βελτιστοποίησης
Creators: name: Ηλιοδρομίτη, Παναγιώτα
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Τηλεφωνικά κέντρα
subject: Βελτιστοποίηση
subject: Διαχείριση πελατειακών σχέσεων
subject: Προγραμματισμός επιχειρησιακών πόρων
subject: Συστήματα Ενδοεπιχειρησιακού Σχεδιασμού

description: Η συγκεκριμένη διπλωματική εργασία αποτελεί μια προσπάθεια αξιολόγησης & εφαρμογής προτάσεων βελτιστοποίησης στις λειτουργίες ενός τηλεφωνικού κέντρου. Η προσέγγιση που ακολουθείται αφορά την αξιολόγηση συγκεκριμένου τηλεφωνικού κέντρου COSMOTE e-value, με την μορφή ερωτηματολογίου στους εργαζομένους του για τις συνολικές παροχές και λειτουργίες του. Βάσει των απαντήσεων γίνεται μια προσπάθεια αξιολόγησης των λειτουργιών με σκοπό να προκύψουν πιθανά σενάρια τόσο ως προς την αλλαγή των συστημικών ροών όσο και ως προς την αλλαγή των λειτουργικών συστημάτων που τις υποστηρίζουν. Η αξιολόγηση του δείγματος γίνεται με διαφορετικά μοντέλα προσέγγισης όπως: • Ανάλυση εγκυρότητας • Ανάλυση αξιοπιστίας • Έλεγχος συσχέτισης των απαντήσεων με μοντέλο Spearman • Ποσοτική ανάλυση Τέλος, με βάση τα παραπάνω παρατίθεται μια σειρά από συμπεράσματα που αντανακλούν την προοπτική εξέλιξη, καθώς και παραρτήματα, όπου αποτυπώνονται αναλυτικά όλοι οι πίνακες & τα διαγράμματα των επιμέρους μοντέλων ανάλυσης.
PREVENTION VERSUS UTILIZATION OF EXCESS NUTRIENTS FROM ANIMAL FEEDING OPERATIONS:THE CASE OF MANAGING NUTRIENT UNCERTAINTY
Creators: name: Kaplan, Jonathan D.
name: Kaplan, Jonathan D.
Publisher: name: Unknown
Year: 2001
Subjects: Environmental Economics and Policy
Livestock Production/Industries

description: Nutrients are a major source of water quality impairment. This paper compares efficient use of nutrients in a wholly owned animal-crop production system versus an integrator-operator animal-crop production system and highlights the operator's tradeoff between prevention and utilization of excreted nutrients under conditions of uncertainty. Results derived from the comparison of different production systems are used to infer the consequences of implementation of nutrient land application restrictions, a key element in the recently drafted United States Department of Agriculture and United States Environmental Protection Agency Unified Strategy for Animal Feeding Operations.
Hawking Radiation as Tunneling: the D-dimensional rotating case
Creators: name: Nadalini, M.
name: Vanzo, L.
name: Zerbini, S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The tunneling method for the Hawking radiation is revisited and applied to the $D$ dimensional rotating case. Emphasis is given to covariance of results. Certain ambiguities afflicting the procedure are resolved.
description: Talk delivered at the Seventh International Workshop Quantum Field Theory under the influence of External Conditions, QFEXT'05, september 05,Barcelona, Spain. To appear in Journal of Phys. A
Konkrete Ansätze der Kirchenreform in der Ökumene
Creators: name: Reitz, Rüdiger
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 18 Nr. 2 (1969): Ökumenische Rundschau, Band 18, Heft 2
Canonical Quantization of the Electromagnetic Field on the Kerr Background
Creators: name: Casals, Marc
name: Ottewill, Adrian C.
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate the canonical quantization of the electromagnetic field on the Kerr background. We give new expressions for the expectation value of the electromagnetic stress-energy tensor in various vacua states and give a physical interpretation of the separate terms appearing in them. We numerically calculate the luminosity in these states. We also study the form of the renormalized stress-energy tensor close to the horizon when the electromagnetic field is in the past Boulware state.
description: 27 zipped, postscript figure files
Braneworld resonances
Creators: name: Clarkson, Chris
name: Seahra, Sanjeev S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate in detail gravitational waves in an Schwarzschild-anti-de Sitter bulk spacetime surrounded by an Einstein static brane with generic matter content. Such a model provides a useful analogy to braneworld cosmology at various stages of its evolution, and generalizes our previous work [gr-qc/0504023] on pure tension Einstein-static branes. We find that the behaviour of tensor-mode perturbations is completely dominated by quasi-normal modes, and we use a variety of numeric and analytic techniques to find the frequencies and lifetimes of these excitations. The parameter space governing the model yields a rich variety of resonant phenomena, which we thoroughly explore. We find that certain configurations can support a number of lightly damped `quasi-bound states'. A zero-mode which reproduces 4-dimensional general relativity is recovered on infinitely large branes. We also examine the problem in the time domain using Green's function techniques in addition to direct numeric integration. We conclude by discussing how the quasi-normal resonances we find here can impact on braneworld cosmology.
description: 22 pages, 18 figures
Graphene with Rashba spin-orbit interaction and coupling to a magnetic layer: Electron states localized at the domain wall
Creators: name: Inglot, M.
name: Dugaev, V. K.
name: Dyrdał, A.
name: Barnaś, J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Electron states localized at a magnetic domain wall in a graphene caplayer with Rashba spin-orbit interaction and coupled to a magnetic overlayer are studied theoretically. It is shown that two one-dimensional bands of edge modes propagating along the domain wall emerge in the energy gap for each Dirac point, and the modes associated with different Dirac points K and K' are the same. The coefficients describing decay of the corresponding wavefunctions with distance from the domain wall contain generally real and imaginary terms. Numerical results on the local spin density and on the total spin expected in the edge states characterized by the wavenumber $k_y$ are presented and discussed. The Chern number for a single magnetic domain on graphene indicates that the system is in the quantum anomalous Hall phase, with two chiral modes at the edges. In turn, the number of modes localized at the domain wall is determined by the difference in Chern numbers on both sides of the wall. These numbers are equal to 2 and -2, respectively, so there are four modes localized at the domain wall.
RETAIL CONTRACTING AND GROWER PRICES
Creators: name: Patterson, Paul M.
name: Richards, Timothy J.
name: Patterson, Paul M.
name: Richards, Timothy J.
Publisher: name: Unknown
Year: 2001
Subjects: subject: Marketing
subject: FOS: Economics and business

description: Contracting directly between produce shippers and retailers is growing in importance. Retailers seek to obtain reliable supplies, while reducing their reliance on recurring market transactions. Producers seek stable prices and market access. These private transactions diminish spot market liquidity and enhance noncompetitive buying opportunities, raising concerns over the resulting impact on grower prices, whether under contract or not, and the future produce market structure. Primary data are used to test hypotheses on contract participation. Simulations on grower prices reveal that contract prices are generally lower, but less variable, than market prices, suggesting a form of risk sharing.
Evaluation of land cover change and agricultural protection sites: a GIS and Remote Sensing approach for Ho Chi Minh City, Vietnam
Creators: name: Schaefer, Mathias
name: Thinh, Nguyen Xuan
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: Environmental science
subject: 710
subject: Geoinformationssystem
subject: Fernerkundung
subject: Zersiedlung

description: Ho Chi Minh City (HCMC), economic center and most populous city of Vietnam faces a strong structural change since its market liberalization in the late 1980s. Big challenges occur in the form of uncontrolled urban sprawl due to rapid population growth with encroachment of agricultural land, which leads to environmental and climatic issues like urban heat island effects, air pollution and flooding events. Remote Sensing and Geographic Information Systems (GIS) provide new computer-based technologies for urban planners which can greatly ease the monitoring of agricultural loss as well as improve decision making for future land management. In the first part of this study, land cover change dynamics are thoroughly assessed using moderate and high spatial resolution satellite imagery (Landsat and SPOT) over the period 2010–2017 in 22 districts of HCMC. In the second part, the land cover classification results of 2017 provide the initial map for a GIS-based Multi-Criteria-Decision-Analysis (MCDA) of potential agricultural protection sites. Therefore, criteria of climate adaptation and ecological service are established and embedded in the GIS-compatible Compromise Programming Model (CP). With the use of Analytic Hierarchy Process (AHP) by Thomas L. Saaty and additional expert knowledge, appropriate weighting factors have been affiliated. The results show that agricultural land decreased by more than two thirds in the period considered. However, particularly the western rural districts Bình Chánh and Hóc Môn still offer a great amount of valuable agricultural land suitable for protection. The proposed method can serve as a scientific framework for planning departments of fast growing cities to zone agricultural land for protection on an early planning stage in order to ensure sustainable land use development in the future.
Induction of proliferative vitreoretinopathy by human retinal pigment epithelial cells
Creators: name: Wong, Christian Alexander
Publisher: name: University of British Columbia
Year: 2009

description: Proliferative vitreoretinopathy (PVR) is characterized by the formation of fibrocellular membranes in the vitreous and on the surfaces of the retina. These membranes exert tractional forces on the retina, causing retinal tears and/or detachments. The purpose of this study is to develop a reproducible animal model that closely mimics PVR in the clinical setting. The retinal pigment epithelial (RPE) cell is the major cell type found in PVR membranes. We cultured RPE cells from a human epiretinal membrane (ERM) obtained at surgery from a patient with PVR, and injected them into the right eye of 24 albino rabbits. The eyes were examined by indirect ophthalmoscopy over 4 weeks. By day 7, all but one of the 24 eyes developed proliferative vitreoretinopathy, with 8 progressing to localized tractional retinal detachment (TRD). By day 21,17 out of the 24 eyes had developed localized TRD. One eye went on to develop an extensive TRD by day 28. Immunostaining showed that mostly RPE cells, but also myofibroblasts, glial cells, and collagen were present in the newly formed rabbit PVR membranes. Thus, human RPE cells cultured from a human PVR membrane appear to be capable of inducing PVR in rabbits. The resultant epiretinal membranes are similar to those formed in human PVR, and consist mainly of RPE cells.
THE COST OF INACCURATE AUTOMOBILE MILEAGE INFORMATION
Creators: name: Sexauer, Benjamin
name: Roe, Terry L.
name: Kinsey, Jean D.
name: Sexauer, Benjamin
name: Roe, Terry L.
name: Kinsey, Jean D.
Publisher: name: Unknown
Year: 1981
Subjects: Consumer/Household Economics

description: The model in this paper integrates the possibility of misinformation into consumer utility theory. If the utility realized from a good differs from the utility anticipated at time of purchase, shifts in demand would occur, and thus changes in consumer surplus. These changes provide a measure of the cost of misinformation or value of improved information. The empirical analysis yields estimates of the private and social cost of inaccuracies in automobile buyers; pre-purchase mileage estimates. If automobile purchases are based on imperfect gasoline mileage information, a discrepancy results between expected and actual fuel-efficiency. The data source is a survey of 1980 model car buyers conducted by the authors.
Η σχέση μεταξύ συναλλαγματικών ισοτιμιών και τιμών μετοχών: ανάλυση από τα κυριότερα διεθνή χρηματιστήρια
Creators: name: Κούρβας, Δημήτριος
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Συνάλλαγμα
subject: Τιμές των μετοχών
subject: Fixed effects
subject: GMM

description: Η παρούσα εργασία έχει ως σκοπό να διερευνήσει την επίδραση των συναλλαγματικών ισοτιμιών στις τιμές χρηματιστηριακών μετοχών. Αυτό θα επιτευχθεί με την χρήση ενός δείγματος με τις χώρες του ΟΟΣΑ για την χρονική περίοδο 2000-2017 και μεταβλητών όπως των κυριότερων χρηματιστηριακών δεικτών (INDEX), του πληθωρισμού (ΙNFLATION), της βιομηχανικής παραγωγής (INDUSTRIAL PRODUCTION), του spread των 10ετών (10 YEAR GOVERNMENT BOND SPREADS) ομολόγων καθώς και των συναλλαγματικών ισοτιμιών (CURRENCY) με βάση το δολάριο. Συγκεκριμένα, θα προσδιοριστεί αν οι συναλλαγματικές ισοτιμίες επιδρούν με συστηματικό τρόπο στις τιμές των μετοχών, λαμβάνοντας υπόψη και την επίδραση των προαναφερθέντων προσδιοριστικών παραγόντων στην διαμόρφωση της υπό ανάλυση σχέσης. Για την εξαγωγή των αποτελεσμάτων θα χρησιμοποιηθούν μέθοδοι για panel δεδομένα, όπως η μέθοδος Ελαχίστων Τετραγώνων με Fixed Effects και η Γενικευμένη Μέθοδος των Ροπών (GMM Method). Από την πραγματοποιηθείσα ανάλυση υπάρχουν ενδείξεις περί θετικής και στατιστικά σημαντικής επίδρασης των συναλλαγματικών ισοτιμιών στις τιμές των μετοχών.
Reduction of the Coulomb logarithm due to electron-neutral collisions
Creators: name: Khrapak, Sergey
Publisher: name: arXiv
Year: 2020
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The frictional force (stopping power) acting on a test electron moving through the ideal electron gas is calculated taking into account electron-neutral atom collisions using the linear plasma response formalism. This allows us to elucidate how the effective Coulomb logarithm is affected by electron-neutral collisions. In agreement with a recent investigation by Hagelaar, Donko, and Dyatko [Phys. Rev. Lett. {\bf 123}, 025004 (2019)] we observe that the effective Coulomb logarithm decreases considerably due to electron-neutral collisions and becomes inversely proportional to the collision frequency in the highly collisional limit.
description: 4 pages, to be published in Phys. Rev. E
MODAL SHIFTS FROM THE MISSISSIPPI RIVER AND DULUTH/SUPERIOR TO LAND TRANSPORTATION
Creators: name: Fruin, Jerry E.
name: Fortowsky, J. Keith
name: Fruin, Jerry E.
name: Fortowsky, J. Keith
Publisher: name: Unknown
Year: 2004
Subjects: Land Economics/Use
Public Economics

description: Proposals to close the Minneapolis Upper Harbor, and convert the area to housing, light industry and recreational uses, would eliminate the barge movement of commodities to/from the Upper Harbor. Several proposals have assumed that this would also eliminate associated freight movement through this area of Minneapolis. However, there would still be a need to move materials such as sand and gravel, cement, steel products, and other construction materials into Minneapolis; and scrap metals from Minneapolis. Truck movements of grain, fertilizer and other commodities from/to northwest of Minneapolis would be rerouted over land through or around Minneapolis to utilize downstream harbors. This study estimates the private costs and public externality costs imposed by this 'modal shift' from barge to truck. These cost estimates include private haulage costs, the public costs due to changes in highway maintenance requirements, and externalities due differences in fuel consumption, changes in air emissions, highway congestion impacts, and highway accident impacts. Facility relocation and required public and private infrastructure investments were not estimated. Coefficients from the FHWA Highway Cost Allocation Study (HCAS) are used to monetize the estimated public and externality costs. Results from the "most likely" scenario indicate an addition of 66,000 truckloads traveling 1.2 million miles in the metro area each year. Increases in transport costs to shippers or customers exceed $4 million annually, increases in highway maintenance exceed $.6 million while public externality costs estimated with the HCAS coefficients exceed $.48 million annually. Results from the "transitional" scenario indicate an addition of 66,000 truckloads traveling 1.6 million miles in the metro area each year. Increases in transport costs to shippers or customers exceed $5.1 million annually; increases in highway maintenance exceed $.93 million while public externality costs estimated with the HCAS coefficients exceed $.68 million annually.
Fiducial displacements with improved accuracy for the global network of gravitational wave detectors
Creators: name: Bhattacharjee, D
name: Lecoeuche, Y
name: Karki, S
name: Betzwieser, J
name: Bossilkov, V
name: Kandhasamy, S
name: Payne, E
name: Savage, R L
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: As sensitivities improve and more detectors are added to the global network of gravitational wave observatories, calibration accuracy and precision are becoming increasingly important. Photon calibrators, relying on power-modulated auxiliary laser beams reflecting from suspended interferometer optics, enable continuous calibration by generating displacement fiducials proportional to the modulated laser power. Developments in the propagation of laser power calibration via transfer standards to on-line power sensors monitoring the modulated laser power have enabled generation of length fiducials with improved accuracy. Estimated uncertainties are almost a factor of two smaller than the lowest values previously reported. This is partly due to improvements in methodology that have increased confidence in the results reported. Referencing the laser power calibration standards for each observatory to a single transfer standard enables reducing relative calibration errors between elements of the detector network. Efforts within the national metrology institute community to realize improved laser power sensor calibration accuracy are ongoing.
description: 26 pages, 10 figures and 8 tables
Properties of components with incrementally formed gears
Creators: name: Wernicke, Sebastian
name: Sieczkarek, Peter
name: Gies, Soeren
name: Tekkaya, A. Erman
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: Sheet-bulk metal forming
subject: Gear forming
subject: Incremental forming
subject: Plate-forging
subject: 620
subject: 670

description: The process class of sheet-bulk metal forming (SBMF) involves several advantages for the manufacture of functional components. Its incremental variant (iSBMF) enables a very flexible dimensioning of components. To treat the unfavorable manufacturing time of the incremental approach, this investigation is focused on an alternative process route using rotating forming tools, which decrease the process time significantly. After an analysis of the mechanical properties as well as the micro- and macroscopic surface quality, a quasi-static benchmark test was performed. Normalized by the weight of the component, gears manufactured by iSBMF and BS600 steel presented the same load capacity as gears manufactured by blanking with subsequent hardening. Here, using innovative high strength steels with a significant strain hardening behavior like high manganese steels enables for weight-reduced gears.
Masses and Interactions of q-Fermionic Knots
Creators: name: Finkelstein, Robert J.
name: Cadavid, A. C.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The q-electroweak theory suggests a description of elementary particles as solitons labelled by the irreducible representations of SU_q(2). Since knots may also be labelled by the irreducible representations of SU_q(2), we study a model of elementary particles based on a one-to-one correspondence between the four families of Fermions (leptons, neutrinos, (-1/3) quarks, (2/3) quarks) and the four simplest knots (trefoils). In this model the three particles of each family are identified with the ground and first two excited states of their common trefoil. Guided by the standard electroweak theory we calculate conditions restricting the masses of the fermions and the interactions between them. In its present form the model predicts a fourth generation of fermions as well as a neutrino spectrum. The same model with q almost equal to 1 is compatible with the Kobayashi-Maskawa matrix. Depending on the test of these predictions, the model may be refined.
description: 40 pages, 2 figures, latex format
Similarities between action potentials and acoustic pulses in a van der Waals fluid
Creators: name: Mussel, Matan
name: Schneider, Matthias F.
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: 530
subject: Aktionspotenzial
subject: Nervenfaser
subject: Biomembran
subject: Lipide

description: An action potential is typically described as a purely electrical change that propagates along the membrane of excitable cells. However, recent experiments have demonstrated that non-linear acoustic pulses that propagate along lipid interfaces and traverse the melting transition, share many similar properties with action potentials. Despite the striking experimental similarities, a comprehensive theoretical study of acoustic pulses in lipid systems is still lacking. Here we demonstrate that an idealized description of an interface near phase transition captures many properties of acoustic pulses in lipid monolayers, as well as action potentials in living cells. The possibility that action potentials may better be described as acoustic pulses in soft interfaces near phase transition is illustrated by the following similar properties: correspondence of time and velocity scales, qualitative pulse shape, sigmoidal response to stimulation amplitude (an ‘all-or-none’ behavior), appearance in multiple observables (particularly, an adiabatic change of temperature), excitation by many types of stimulations, as well as annihilation upon collision. An implication of this work is that crucial functional information of the cell may be overlooked by focusing only on electrical measurements.
Implicit Molecular Stresses in Weakly-Compressible Particle-Based Discretization Methods for Fluid Flow
Creators: name: Okraschevski, Max
name: Buerkle, Niklas
name: Koch, Rainer
name: Bauer, Hans-Joerg
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Weakly-compressible particle-based discretization methods, utilized for the solution of the subsonic Navier-Stokes equation, are gaining increasing popularity in the fluid dynamics community. One of the most popular among these methods is the weakly-compressible smoothed particle hydrodynamics (WCSPH). Since the dynamics of a single numerical particle is determined by fluid dynamic transport equations, the particle per definition should represent a homogeneous fluid element. However, it can be easily argued that a single particle behaves only pseudo-Lagrangian as it is affected by volume partition errors and can hardly adapt its shape to the actual fluid flow. Therefore, we will assume that the kernel support provides a better representative of an actual fluid element. By means of non-equilibrium molecular dynamics (NEMD) analysis, we derive isothermal transport equations for a kernel-based fluid element. The main discovery of the NEMD analysis is a molecular stress tensor which may serve to explain current problems encountered in applications of weakly-compressible particle-based discretization methods.
description: v4: Removed typo in (B3) of Appendix
Σύγκριση στρατηγικών ασφάλισης χαρτοφυλακίων
Creators: name: Φώτου, Χριστιάνα
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Ασφάλιση χαρτοφυλακίου
subject: CPPI
subject: OBPI

description: Κάθε επενδυτής έχει στο χαρτοφυλάκιό του τόσο ασφαλή περιουσιακά στοιχεία όπως τα μετρητά, τα γραμμάτια, τα ομόλογα κ.α., όσο και ριψοκίνδυνα όπως οι μετοχές. Οι οποίες παίζουν σημαντικό ρόλο καθώς επενδύοντας τες με σύνεση και προσεκτικές κινήσεις, μπορεί κάποιος να αυξήσει την αξία του χαρτοφυλακίου του. Σε αντιδιαστολή με τα ασφαλή περιουσιακά στοιχεία, τα οποία δεν δίνατε να αξιοποιηθούν περαιτέρω για να αυξήσουν την αξία του χαρτοφυλακίου. Η επένδυση όμως σε μετοχές κάθε άλλο παρά εύκολη μπορεί να χαρακτηριστεί καθώς η αγορά του χρηματιστηρίου αποτελεί μια πολύπλοκη και σύνθετη αγορά. Καθώς, προκειμένου επενδύοντας να προκύψει κέρδος απαιτούνται γνώσεις, προσετικές και μελετημένες κινήσεις. Διότι, με την ίδια ευκολία που μπορεί να προκύψει κέρδος, μπορεί να προκύψουν και απώλειες. Γι’ αυτό το λόγο δημιουργήθηκαν οι στρατηγικές ασφάλισης χαρτοφυλακίου προκειμένου να μετριάσουν την απώλεια αυτή μέχρι ενός προκαθορισμένου σημείου με όσο το δυνατόν μικρότερο κόστος. Στην παρούσα διπλωματική ασχολούμαστε με δύο βασικές στρατηγικές την CPPI (Constant Proportion Portfolio Insurance) ή Σταθερή Αναλογία Ασφάλισης Χαρτοφυλακίου και την OBPI (Option Based Portfolio Insurance) η οποία όπως προδιαθέτει και το όνομά της βασίζεται σε δικαιώματα προαίρεσης. Με παραδείγματα τόσο με πλασματικά όσο και με πραγματικά δεδομένα δείξαμε τη συμβολή τους στις διακυμάνσεις της αγοράς. Δώσαμε έμφαση στο μεγάλο πλήγμα που δέχτηκαν οι αγορές με το ξέσπασμα της πανδημίας του κορωνοϊού, προσπαθήσαμε ουσιαστικά να δώσουμε μια μικρή «γεύση» των επιπτώσεων της αναπάντεχης και πολύ δύσκολης συγκυρίας που διανύουμε.
Mass transfer of proteins in aqueous two-phase systems
Creators: name: Kaplanow, Irene
name: Görzgen, Fabian
name: Merz, Juliane
name: Schembecker, Gerhard
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: 660
subject: Extraktion

description: Aqueous Two-Phase Extraction is known to be a gentle separation technique for biochemical molecules where product partitioning is fast. However, the reason for the high mass transfer rates has not been investigated, yet. Many researchers claim that the low interfacial tension facilitates the formation of very small droplets and with it a large interfacial area causing a fast partitioning. However, an experimental evidence for this hypothesis has not been published yet. In this study, the mass transfer coefficients of two proteins, namely lysozyme and bromelain, were determined by providing a defined interfacial area for partitioning. Compared to low molecular weight solutes the mass transfer coefficient for the proteins investigated was small proving for the first time that the large interfacial area and not fast diffusion seems to be the reason for fast protein partitioning.
Finite-dimensional observer-based PI regulation control of a reaction-diffusion equation
Creators: name: Lhachemi, Hugo
name: Prieur, Christophe
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optimization and Control (math.OC)
subject: Systems and Control (eess.SY)
subject: FOS: Mathematics
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper investigates the output feedback setpoint regulation control of a reaction-diffusion equation by means of boundary control. The considered reaction-diffusion plant may be open-loop unstable. The proposed control strategy consists of the coupling of a finite-dimensional observer and a PI controller in order to achieve the boundary setpoint regulation control of various system outputs such as the Dirichlet and Neumann traces. In this context, it is shown that the order of the finite-dimensional observer can always be selected large enough, with explicit criterion, to achieve both the stabilization of the plant and the setpoint regulation of the system output.
Simultaneous prediction of cosolvent influence on reaction equilibrium and Michaelis constants of enzyme-catalyzed ketone reductions
Creators: name: Wangler, Anton
name: Hüser, Aline
name: Sadowski, Gabriele
name: Held, Christoph
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: 660
subject: Katalyse
subject: Enzym

description: Understanding and quantification of cosolvent influences on enzyme-catalyzed reactions are driven by a twofold interest. On the one hand, cosolvents can simulate the cellular environment for deeper understanding of in cellulo reaction conditions. On the other hand, cosolvents are applied in biotechnology to tune yield and kinetics of reactions. Further, cosolvents are even present inherently, for example, for reactions with cofactor regeneration or for enzymes that need cosolvents in a function of a stabilizer. As the experimental determination of yield and kinetics is costly and time consuming, this work aims at providing a thermodynamic predictive approach that might allow screening cosolvent influences on yield and Michaelis constants. Reactions investigated in this work are the reduction of butanone and 2-pentanone under the influence of 17 wt % of the cosolvent polyethylene glycol 6000, which is also often used as a crowder to simulate cellular environments. The considered reactions were catalyzed by a genetically modified alcohol dehydrogenase (ADH 270). Predictions of cosolvent influences are based on accounting for a cosolvent-induced change of molecular interactions among the reacting agents as well as between the reacting agents and the solvent. Such interactions were characterized by activity coefficients of the reacting agents that were predicted by means of electrolyte perturbed-chain statistical associating fluid theory. This allowed simultaneously predicting the cosolvent effects on yield and Michaelis constants for two-substrate reactions for the first time.
Acoustical modeling of rooms with extended-reaction surfaces
Creators: name: Wareing, Andrew
Publisher: name: University of British Columbia
Year: 2009

description: The acoustical modeling of rooms has always been a great challenge, especially when efforts are made to incorporate acoustical phenomena that are complicated to model. Knowledge of the acoustical behaviour of room surfaces is fundamental to predicting the sound field in a room. Surfaces are classified, acoustically, as of either extended or local reaction. All known room-prediction models assume, whether implicitly or explicitly, that surfaces are of local reaction. How can extended-reaction surfaces be incorporated into room-prediction models? What is the significance to predicted steady-state sound pressures in rooms of surfaces modeled as of extended vs. local reaction? This thesis is a detailed account of research dedicated to answering these questions. The main research goal was to develop a computationally efficient room-prediction model that included phase, and was applicable to rooms with extended- and local-reaction surfaces. A literature review concluded that a combined beam-tracing model with phase, and a transfer-matrix approach to model the surfaces, was the best choice. The transfermatrix model is applicable to extended- or local-reaction surfaces. These surfaces are modeled as multi-layers of fluid, solid or porous materials. Biot theory was used in the transfer-matrix formulation of the porous layer. The new model consisted of the transfer-matrix model integrated into the beam-tracing algorithm. The model is valid for specular reflection only, and calculations were performed in the frequency domain. Both models were validated, and applied to three different room configurations: a 3m x 3m x 3m small office; a 10m x 3m x 3m corridor; and a 10m x 10m x 3m small industrial workroom. The test surfaces consisted of a glass plate, double drywall panels, double steel panels, a carpeted floor and a suspended-acoustical ceiling. Two predictions were made for each test surface in each room configuration - one for extended and one for local reaction. Results showed significantly higher predicted sound-pressure levels in rooms with a suspended-acoustical ceiling modeled as extended reaction, at low frequency. Rooms with walls of double drywall panels modeled as an extended-reaction surface showed significantly higher predicted sound-pressure levels. Sound-pressure levels were shown to be nearly equal in rooms with a single glass panel, carpet, and fibre-glass modeled as an extendedor local-reaction surface. An analysis of the reflection coefficients of these surfaces was performed to explain the results. The results confirm that it can be important to model the extended-reaction nature of room surfaces in some cases.
NORTHEAST MINNESOTA TRENDS AND OPTIONS
Creators: name: Maki, Wilbur R.
name: Maki, Wilbur R.
Publisher: name: Unknown
Year: 1983
Subjects: Community/Rural/Urban Development

description: Existing statistical series on Northeast Minnesota economy are used in establishing a factual base for assessing regional economic trends and options. Population, labor force, and industry employment are presented in two contrasting options for Northeast Minnesota, namely, a baseline option and a differential option.
MONOTONICITY AND CURVATURE - A BOOTSTRAPPING APPROACH
Creators: name: Sauer, Johannes
name: Sauer, Johannes
Publisher: name: Unknown
Year: 2006
Subjects: subject: Financial Economics
subject: Econometric Modeling
subject: Flexible Functional Forms
subject: Theoretical Consistency
subject: Bootstrapping

description: This research contributes to the ongoing discussion on functional flexibility and theoretical consistency by comparing the empirical performance of two second order flexible functional forms - the Symmetric Generalized McFadden and the Transcendental Logarithmic. It proposes an estimation procedure to enhance the domain of applicability for the Translog by a combination of matrix decomposition, classical non-linear estimation techniques as well as bootstrapping based resampling. The validity of the proposed procedure is exemplified by applying it to a sample of small-scale farmers. The results show that the range of theoretical consistency can be crucially enhanced for the Translog functional form by maintaining its flexibility and statistical significance. Hence, beside its empirical superiority by applying the outlined procedure the Translog can also catch up with respect to the range of functional consistency.
Integrated forming and surface engineering of disc springs by inducing residual stresses by incremental sheet forming
Creators: name: Hajavifard, Ramin
name: Maqbool, Fawad
name: Schmiedt-Kalenborn, Anke
name: Buhl, Johannes
name: Bambach, Markus
name: Walther, Frank
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: Disc spring
subject: Residual stress adjustment
subject: Incremental sheet forming
subject: Metastable austenitic stainless steel (MASS)
subject: Martensite transformation
subject: Numerical modelling
subject: 660
subject: Feder
subject: Stahl

description: Disc springs are conical annular discs, which are characterized by a high spring force with a small spring travel and good space utilization. In operation, they must meet high demands on the stability of the spring characteristic and the fatigue strength. Under loading, tensile stresses occur which limit the possible applications of disc springs. Compressive stresses can be generated in the stressed areas by means of shot-peening in order to extend the operating limits for a given yield and fatigue strength. Since the spring geometry and characteristics change during shot-peening, the design of the shot-peening treatment is iterative and cumbersome. The present research proposes an incremental forming process for forming and integrated targeted adjustment of residual stresses in disc springs from metastable austenitic stainless steel (MASS), to achieve improved spring properties and high cyclic strength. The main mechanism of residual stress generation is the transformation of metastable austenite into martensite under the action of the forming tool. Different experimental characterization techniques like the hole drilling method, X-ray diffraction, disc compression tests, optical microscopy and cyclic tests are used to correlate the residual stresses and disc spring properties. A numerical model is developed for simulating the martensite transformation in disc springs manufacturing. The results prove that incremental forming enables process-integrated engineering of the desired compressive residual stresses, entailing a higher spring force of metastable austenitic disc springs in comparison to conventional disc springs. Due to martensite formation, the generated residual stresses are stable under cyclic loading, which is not the case for conventionally manufactured springs.
description: Materials;Vol. 12, H. 10, S. 1646-1-1646-19