cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
DEMAND FOR CREDENCE CHARACTERISTICS IN BEEF
Creators: name: Kola, Jukka
name: Latvala, Terhi
name: Kola, Jukka
name: Latvala, Terhi
Publisher: name: Unknown
Year: 2002
Subjects: subject: Demand and Price Analysis
subject: beef
subject: information
subject: credence attributes
subject: contingent valuation
subject: willingness to pay

description: The recent food crises in Europe have raised public concerns about the quality and safety of food. The growing concern among the consumers towards food safety issues has increased the demand for quality attributes. Most quality properties of food products can be considered as credence characteristics, quality of which cannot be inferred before the purchase, and sometimes not even after the purchase. The aim of this study is to evaluate, both qualitatively and quantitatively, the value of new information about and the information systems set for credence characteristics of beef. Economics of information is the theoretical framework. The quantitative approach focuses to measure the ex ante value of credence characteristics, and the method of contingent valuation is applied for this purpose. In the beef supply chain there are two parallel information-based policies in Finland, which will increase the credence characteristics of beef quality and safety. First, the National Quality Strategy was drawn up by all parties involved in foodstuffs production to express the competitive advantages and strengths of Finnish food products relating to quality, safety, ethics, and ecology. Secondly, a beef identification and labelling system of the European Union was developed primarily to secure the safety of beef products and to increase the transparency and traceability of beef products in the supply chain. Through these systems more information about the credence characteristics of beef safety and quality will be made available to consumers. Results indicate that 59 % of Finnish consumers are willing to pay more to get information about safety and quality of beef products. Consumers are most concerned with diseases caused by food of animal origin. In addition, consumers desire more information about the use of GMOs in livestock production, the country of origin, and use of hormones in livestock production. Key words: beef, information, credence attributes, contingent valuation, willingness to pay
Η διάσπαση του ν. 4601/2019
Creators: name: Νικητάκη, Σοφία
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Διάσπαση εταιρειών
subject: Εταιρικό δίκαιο

description: Στην παρούσα εργασία εξετάζεται κατά κύριο λόγο η διάσπαση ως προβλεπόμενος γνήσιος εταιρικός μετασχηματισμός του ν. 4601/2019. Αρχικά, γίνεται αναφορά στο προγενέστερο δίκαιο και τις παλαιότερες σχετικές ρυθμίσεις. Στη συνέχεια, αναλύεται το περιεχόμενο του ισχύοντος και εξεταζόμενου νόμου, ενώ παράλληλα αναδεικνύονται οι επιρροές, οι καινοτομίες, οι στόχοι της καθώς και η νομοτεχνική του δομή. Επίσης, γίνεται μνεία και μερική ανάλυση του συνόλου των νόμιμων εταιρικών μετασχηματισμών που ρυθμίζονται από τον ν. 4601/2019. Ακολούθως, μελετώνται τα ιδιαίτερα χαρακτηριστικά και οι επιμέρους μορφές της διάσπασης, ενώ αναλύονται λεπτομερώς συγκεκριμένοι ορισμοί και βασικές έννοιες, που είναι χρήσιμες για την επίτευξή της. Ακόμα, γίνεται συγκριτική επισκόπηση μεταξύ των διαφόρων μορφών διάσπασης και των διαφόρων ειδών εταιρικών μετασχηματισμών, με μελέτη και ανάλυση των έννομων αποτελεσμάτων τους. Επιπλέον, αναπτύσσεται ο ρόλος της διάσπασης στη νομική, επιχειρηματική και οικονομική πραγματικότητα. Ειδικότερα, παρατίθενται στοιχεία και δεδομένα και από άλλες επιστήμες όπως π.χ. τα οικονομικά ή η στατιστική προκειμένου να αναδειχθεί η σημασία της διάσπασης από οικονομική, πολιτική, φορολογική, εργασιακή, κοινωνική σκοπιά. Μέσω αυτής της ανάλυσης αναδεικνύεται η αλληλεπίδραση του εταιρικού δικαίου με άλλα δίκαια καθώς και οι σχετικές δικαιοπολιτικές επιδιώξεις. Επιπρόσθετα, εξετάζονται πραγματικά παραδείγματα διασπάσεων ελληνικών επιχειρήσεων που έλαβαν χώρα από τη θέση σε ισχύ του ν. 4601/2019. Τέλος, καταγράφονται τα αποτελέσματα της μελέτης και της έρευνας που έγιναν στο πλαίσιο της παρούσας, ενώ διατυπώνεται και τελική άποψη επ’ αυτών. Στόχος του παρόντος πονήματος είναι η ολιστική αντιμετώπιση ενός δικαιϊκού φαινομένου που αποτελεί μια νέα δυνατότητα του εταιρικού δικαίου, χωρίς στείρες επαναλήψεις ή απλές αναδιατυπώσεις της νομοθεσίας. Συγκεκριμένα, βασική επιδίωξη της γράφουσας είναι η ανάδειξη μιας συνολικής οπτικής επί της διάσπασης, σε συνδυασμό με αλληλοεπιδρώντα δίκαια, εξωνομικές συνθήκες αλλά εντός των απαιτήσεων ενός επιχειρηματικού περιβάλλοντος.
From Luttinger liquid to Mott insulator: the correct low-energy description of the one-dimensional Hubbard model by an unbiased variational approach
Creators: name: Capello, Manuela
name: Becca, Federico
name: Yunoki, Seiji
name: Fabrizio, Michele
name: Sorella, Sandro
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We show that a particular class of variational wave functions reproduces the low-energy properties of the Hubbard model in one dimension. Our approach generalizes to finite on-site Coulomb repulsion the fully-projected wave function proposed by Hellberg and Mele [Phys. Rev. Lett. {\bf 67}, 2080 (1991)] for describing the Luttinger-liquid behavior of the doped $t{-}J$ model. Within our approach, the long-range Jastrow factor emerges from a careful minimization of the energy, without assuming any parametric form for the long-distance tail. Specifically, in the conducting phase of the Hubbard model at finite hole doping, we obtain the correct power-law behavior of the correlation functions, with the exponents predicted by the Tomonaga-Luttinger theory. By decreasing the doping, the insulating phase is reached with a continuous change of the small-$q$ part of the Jastrow factor.
description: 7 pages, 9 figures
STRUCTURAL CHANGE OR LOGICAL INCREMENTALISM? TURBULENCE IN THE GLOBAL MEAT SYSTEM
Creators: name: Goldsmith, Peter D.
name: Salvador, Antonio
name: Knipe, Dar
name: Kendall, Elaine
name: Goldsmith, Peter D.
name: Salvador, Antonio
name: Knipe, Dar
name: Kendall, Elaine
Publisher: name: Unknown
Year: 2002
Subjects: Livestock Production/Industries

description: In the last ten years the global meat industry has encountered numerous critical events related to food safety and food quality. These events in turn have caused the industry to re-evaluate how the meat supply chain functions and how to service the new social attributes demanded in the market place. Issues like source-verified, non-GMO, and organic are becoming important sources of product differentiation. How should firms in the meat supply chain respond? This study uses a needs assessment approach with meat supply chain managers and direct cataloguing of retail meat cases to better understand how the US meat supply chain is reacting to the turbulence in the industry.
Upper limits on density of dark matter in Solar system
Creators: name: Khriplovich, I. B.
name: Pitjeva, E. V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The analysis of the observational data for the secular perihelion precession of Mercury, Earth, and Mars, based on the EPM2004 ephemerides, results in new upper limits on density of dark matter in the Solar system.
description: 4 pages, numerical errors corrected, qualitatively same upper limits
LOCATION-SPECIFIC MODELING FOR OPTIMIZING WILDLIFE MANAGEMENT ON CROP FARMS
Creators: name: Van Wenum, Jaap
name: Wossink, Ada
name: Renkema, Jan
name: Van Wenum, Jaap
name: Wossink, Ada
name: Renkema, Jan
Publisher: name: Unknown
Year: 2002
Subjects: Resource /Energy Economics and Policy

description: In order to guide conservation and restoration of wildlife in agricultural areas research is needed into the trade-off between wildlife and agricultural production and income. This study presents a location specific model for optimizing wildlife management on crop farms using the integer programming technique. Available data and indicators of wildlife production are presented. Furthermore, time and location aspects of wildlife management are discussed. The model is applied to crop farming in the Netherlands. Most important model outcome is a wildlife-cost frontier at the farm level. Model outcomes show that rotating wildlife conservation practices across the farm is economically more attractive than fixed-location practices. Opportunities for use of the insights provided by model results by both policy makers and farmers are analyzed.
Ballistic emission spectroscopy and imaging of a buried metal-organic interface
Creators: name: Troadec, Cedric
name: Kunardi, Linda
name: Chandrasekhar, N.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The silver-p-phenylene (Ag-PPP) interface is investigated using ballistic electron emission microscopy (BEEM). Multiple injection barriers and spatial nonuniformity of carrier injection over nanometer length scales are observed. No unique injection barrier is found. Physical reasons for these features are discussed. BEEM current images and the surface topography of the silver film are uncorrelated.
description: To appear in Applied Physics Letters
Ανάπτυξη πληροφοριακού συστήματος και λογισμικού αναγνώρισης προσώπου
Creators: name: Μαθιούδης, Νικόλαος
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Face recognition
subject: Python
subject: Javascript
subject: Node
subject: React
subject: Web application

description: Η συνεχής αύξηση του όγκου δεδομένων δημιουργεί ολοένα και περισσότερες δυνατότητες επεξεργασίας και εξαγωγής συμπερασμάτων από αυτά. Σκοπός κατά την διάρκεια ανάπτυξης πληροφοριακών συστημάτων είναι η ενσωμάτωση υποσυστημάτων που αποθηκεύουν, καταγράφουν και αναλύουν όλο αυτό το πλήθος των δεδομένων. Στην παρούσα διπλωματική αναπτύσσεται μια πλατφόρμα που ενσωματώνει στην λειτουργία μιας επιχείρησης του κλάδου υγείας, σύστημα αναγνώρισης προσώπου. Με τον τρόπο αυτό αναλύονται πληροφορίες που αφορούν τις προτιμήσεις και τις συνήθειες των ανθρώπων ώστε οι υπηρεσίες που προσφέρονται να είναι στοχευμένες, αποτελεσματικότερες και προσαρμοσμένες στις ανάγκες του εκάστοτε ανθρώπου.
CONDITIONAL FORECASTING FOR THE U.S. DAIRY PRICE COMPLEX WITH A BAYESIAN VECTOR AUTOREGRESSIVE MODEL
Creators: name: Thraen, Cameron S.
name: Thompson, Stanley R.
name: Gohout, Wolfgang
name: Thraen, Cameron S.
name: Thompson, Stanley R.
name: Gohout, Wolfgang
Publisher: name: Unknown
Year: 2002
Subjects: Demand and Price Analysis

description: A dynamic Bayesian Vector Autoregressive model of the U.S. dairy price complex is estimated based on the Normal-Wishart distribution. The Gibbs sample technique is use with the Normal-Wishart distribution to provide conditional forecasts on the future time-paths of the model variables. The conditional forecasts for key prices are examined. Confidence intervals are calculated for the conditional forecasts.
Infinitely many small solutions to an elliptic PDE of variable exponent with a singular nonlinearity
Creators: name: Ghosh, Sekhar
name: Choudhuri, Debajyoti
name: Giri, Ratan Kr.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35R11, 35J60, 35J75, 46E35

description: We prove the existence of infinitely many nonnegative solutions to the following nonlocal elliptic partial differential equation involving singularities \begin{align} (-Δ)_{p(\cdot)}^{s} u&=\fracλ{|u|^{γ(x)-1}u}+f(x,u)~\text{in}~Ω,\nonumber u&=0~\text{in}~\mathbb{R}^N\setminusΩ,\nonumber \end{align} where $Ω\subset\mathbb{R}^N,\, N\geq2$ is a smooth, bounded domain, $λ>0$, $s\in (0,1)$, $γ(x)\in(0,1)$ for all $x\in\barΩ$, $N>sp(x,y)$ for all $(x,y)\in\barΩ\times\barΩ$ and $(-Δ)_{p(\cdot)}^{s}$ is the fractional $p(\cdot)$-Laplacian operator with variable exponent. The nonlinear function $f$ satisfies certain growth conditions. Moreover, we establish a uniform $L^{\infty}(\barΩ)$ estimate of the solution(s) by the Moser iteration technique.
description: 21 pages
Crystal structure of 2-methyl-1,2,3,4-tetra­hydro­iso­quinoline trihydrate
Creators: name: Langenohl, Felix
name: Otte, Felix
name: Strohmann, Carsten
Publisher: name: Technische Universität Dortmund
Year: 2020
Subjects: subject: crystal structure
subject: 2-methyl-1,2,3,4-tetra­hydro­iso­quinoline
subject: TIQ
subject: heterocyclic amine
subject: secondary amine
subject: hydrogen bonding
subject: crystal water
subject: 540

description: The crystal structure of the title compound, C10H13N·3H2O, a heterocyclic amine, was determined in the presence of water. The compound co-crystallizes with three water mol­ecules in the asymmetric unit, which leads to the formation of hydrogen bonding in the crystal.
description: Acta crystallographica / IUC, International Union of Crystallography. Section E, Crystallographic communications;(2020). E76, 298-302
A Morse-theoretical analysis of gravitational lensing by a Kerr-Newman black hole
Creators: name: Hasse, Wolfgang
name: Perlick, Volker
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Consider, in the domain of outer communication of a Kerr-Newman black hole, a point (observation event) and a timelike curve (worldline of light source). Assume that the worldline of the source (i) has no past end-point, (ii) does not intersect the caustic of the past light-cone of the observation event, and (iii) goes neither to the horizon nor to infinity in the past. We prove that then for infinitely many positive integers k there is a past-pointing lightlike geodesic of (Morse) index k from the observation event to the worldline of the source, hence an observer at the observation event sees infinitely many images of the source. Moreover, we demonstrate that all lightlike geodesics from an event to a timelike curve in the domain of outer communication are confined to a certain spherical shell. Our characterization of this spherical shell shows that in the Kerr-Newman spacetime the occurrence of infinitely many images is intimately related to the occurrence of centrifugal-plus-Coriolis force reversal.
description: 14 pages, 2 figures; REVTEX; submitted to J. Math. Phys
Bistability and oscillations in cooperative microtubule and kinetochore dynamics in the mitotic spindle
Creators: name: Schwietert, Felix
name: Kierfeld, Jan
Publisher: name: Technische Universität Dortmund
Year: 2020
Subjects: subject: Mitotic spindle
subject: Directional instability
subject: Microtubule dynamics
subject: Kinetochore oscillations
subject: Bistability
subject: Stochastic simulation
subject: 530

description: In the mitotic spindle microtubules attach to kinetochores via catch bonds during metaphase, and microtubule depolymerization forces give rise to stochastic chromosome oscillations. We investigate the cooperative stochastic microtubule dynamics in spindle models consisting of ensembles of parallel microtubules, which attach to a kinetochore via elastic linkers. We include the dynamic instability of microtubules and forces on microtubules and kinetochores from elastic linkers. A one-sided model, where an external force acts on the kinetochore is solved analytically employing a mean-field approach based on Fokker–Planck equations. The solution establishes a bistable force–velocity relation of the microtubule ensemble in agreement with stochastic simulations. We derive constraints on linker stiffness and microtubule number for bistability. The bistable force–velocity relation of the one-sided spindle model gives rise to oscillations in the two-sided model, which can explain stochastic chromosome oscillations in metaphase (directional instability). We derive constraints on linker stiffness and microtubule number for metaphase chromosome oscillations. Including poleward microtubule flux into the model we can provide an explanation for the experimentally observed suppression of chromosome oscillations in cells with high poleward flux velocities. Chromosome oscillations persist in the presence of polar ejection forces, however, with a reduced amplitude and a phase shift between sister kinetochores. Moreover, polar ejection forces are necessary to align the chromosomes at the spindle equator and stabilize an alternating oscillation pattern of the two kinetochores. Finally, we modify the model such that microtubules can only exert tensile forces on the kinetochore resulting in a tug-of-war between the two microtubule ensembles. Then, induced microtubule catastrophes after reaching the kinetochore are necessary to stimulate oscillations. The model can reproduce experimental results for kinetochore oscillations in PtK1 cells quantitatively.
description: New J. Phys.;22(5)
Deterministic multi-mode gates on a scalable photonic quantum computing platform
Creators: name: Larsen, Mikkel V.
name: Guo, Xueshi
name: Breum, Casper R.
name: Neergaard-Nielsen, Jonas S.
name: Andersen, Ulrik L.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Quantum computing can be realized with numerous different hardware platforms and computational protocols. A highly promising approach to foster scalability is to apply a photonic platform combined with a measurement-induced quantum information processing protocol where gate operations are realized through optical measurements on a multipartite entangled quantum state -- a so-called cluster state. Heretofore, a few quantum gates on non-universal or non-scalable cluster states have been, but a full set of gates for universal scalable quantum computing has not been realized. We propose and demonstrate the deterministic implementation of a multi-mode set of measurement-induced quantum gates in a large two-dimensional (2D) optical cluster state using phase-controlled continuous variable quadrature measurements. Each gate is simply programmed into the phases of the high-efficiency quadrature measurements which execute the transformations by teleportation through the cluster state. Using these programmable gates, we demonstrate a small quantum circuit consisting of 10 single-mode gates and 2 two-mode gates on a three-mode input state. On this platform, fault-tolerant universal quantum computing is possible if the cluster state entanglement is improved and a supply of Gottesman-Kitaev-Preskill qubits is available. Moreover, it operates at the telecom wavelength and is therefore network connectable without quantum transducers.
Estrogen receptor subtype agonist activation in human cutaneous squamous cell carcinoma cells modulates expression of CD55 and Cyclin D1
Creators: name: Lan, Jing
name: Gao, Xing-Hua
name: Kaul, Rashmi
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: Estrogen
subject: Estrogen receptor
subject: Cutaneous squamous cell carcinoma
subject: Cyclin D1
subject: CD55
subject: GPR30
subject: 610

description: Clinical studies indicate gender bias in cutaneous squamous cell carcinoma (cSCC) incidence with worse prognosis observed in males than in females, suggesting estrogen-mediated protection. In contrast, recent clinical population studies show risk of cSCC by use of oral contraceptives, thus raising controversy. However, animal studies indicate a protective role of estrogen and estrogen receptor (ER)s in cSCC. Currently we have a poor understanding of ERs that are expressed in human cSCC cells and their possible role in malignant transformation. The focus of current study was to determine ER subtype specific expression on cSCC A431 cells and investigate if ER agonist based activation modulates tumor markers CD55 and Cyclin D1 in the cells. ERα, ERβ and G protein-coupled receptor (GPR30) subtype expression at mRNA and protein level was determined in human cSCC A431 cells by reverse transcription-quantitative polym erase chain reaction (RT-qPCR) and Western blotting, respectively. The localization of ER subtypes was determined by confocal microscopy. ER subtype agonist based activation on A431 cells was performed to investigate their role in modulating mRNA and protein expression of tumor markers CD55 and Cyclin D1. A431 cells differentially expressed all three ER subtypes- ERα, ERβ and GPR30 with GPR30 expression being the highest. Confocal studies confirmed that all three ER subtypes were expressed in the cytoplasm and ERα and ERβ lacked nuclear expression. Agonist based activation of both ERα and GPR30 significantly upregulated Cyclin D1 and CD55 expression. Blocking of GPR30 led to significantly downregulation of both Cyclin D1 and CD55 expression. In contrast to ERα and GPR30, ERβ activation significantly downregulated CD55 expression. Taken together, here we demonstrate for the first time that all three ERs- ERα, ERβ and GPR30 are expressed in human A431 cSCC cells and further ER agonist based activation modulates the expression of tumor markers CD55 and Cyclin D1.
description: EXCLI Journal;Vol. 18 2019
Generalized functional linear models
Creators: name: Muller, Hans-Georg
name: Stadtmuller, Ulrich
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62G05, 62G20 (Primary) 62M09, 62H30 (Secondary)

description: We propose a generalized functional linear regression model for a regression situation where the response variable is a scalar and the predictor is a random function. A linear predictor is obtained by forming the scalar product of the predictor function with a smooth parameter function, and the expected value of the response is related to this linear predictor via a link function. If, in addition, a variance function is specified, this leads to a functional estimating equation which corresponds to maximizing a functional quasi-likelihood. This general approach includes the special cases of the functional linear model, as well as functional Poisson regression and functional binomial regression. The latter leads to procedures for classification and discrimination of stochastic processes and functional data. We also consider the situation where the link and variance functions are unknown and are estimated nonparametrically from the data, using a semiparametric quasi-likelihood procedure. An essential step in our proposal is dimension reduction by approximating the predictor processes with a truncated Karhunen-Loeve expansion. We develop asymptotic inference for the proposed class of generalized regression models. In the proposed asymptotic approach, the truncation parameter increases with sample size, and a martingale central limit theorem is applied to establish the resulting increasing dimension asymptotics. We establish asymptotic normality for a properly scaled distance between estimated and true functions that corresponds to a suitable L^2 metric and is defined through a generalized covariance operator.
description: Published at http://dx.doi.org/10.1214/009053604000001156 in the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Η ιατρικώς υποβοηθούμενη αναπαραγωγή στη χώρα μας: η περίπτωση της παρένθετης μητρότητας (νομικές, κοινωνικο-οικονομικές και ηθικές διαστάσεις)
Creators: name: Αθανασούλια, Σοφία
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Ιατρικώς υποβοηθούμενη αναπαραγωγή
subject: Παρένθετη μητρότητα
subject: Νομικές ρυθμίσεις

description: Παρουσιάζεται το νομικό πλαίσιο που διέπει τις προϋποθέσεις πρόσβασης στη μέθοδο της λεγόμενης «παρένθετης μητρότητας» στη χώρα μας, καθώς επίσης και οι έννομες συνέπειες αυτής. Βασικό ζητούμενο, πέραν της αποσαφήνισης κάποιων «ανοικτών» ερμηνευτικών ζητημάτων, είναι η αξιολόγηση του ισχύοντος νομικού πλαισίου, στη βάση των θεμελιωδών παραδοχών, ιδεολογικής και πολιτικής εν τέλει χροιάς, που υπαινικτικά το διατρέχουν. Για να είναι η εν λόγω αξιολόγηση επαρκώς θεμελιωμένη, κρίναμε αναγκαίο να ξεκινήσουμε από το κοινωνικό πλαίσιο εντός του οποίου η προσφυγή στη μέθοδο της παρένθετης μητρότητας αναδύεται. Συνεπώς, στη μελέτη μας εστιάζουμε και παρουσιάζουμε, καταρχήν, τις κοινωνικές, τις ηθικο-φιλοσοφικές και τις οικονομικές όψεις τόσο τις υποβοηθούμενης αναπαραγωγής γενικώς, όσο και της παρένθετης μητρότητας ειδικώς, ώστε να καταστεί σαφές το πλήρες κοινωνικό πλαίσιο εντός του οποίου τοποθετείται η νομική ρύθμιση που πρωτίστως μας απασχολεί. Αφ’ ης στιγμής οι βασικές κοινωνικές παράμετροι του ζητήματος καταστούν σαφείς, παρουσιάζουμε διεξοδικώς τις ισχύουσες ρυθμίσεις, οι οποίες εκκινούν από το επιτρεπτό της προσφυγής στη μέθοδο της παρένθετης μητρότητας, υπό αυστηρές, ωστόσο, προϋποθέσεις.
Action Sequence Augmentation for Early Graph-based Anomaly Detection
Creators: name: Zhao, Tong
name: Ni, Bo
name: Yu, Wenhao
name: Guo, Zhichun
name: Shah, Neil
name: Jiang, Meng
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: The proliferation of web platforms has created incentives for online abuse. Many graph-based anomaly detection techniques are proposed to identify the suspicious accounts and behaviors. However, most of them detect the anomalies once the users have performed many such behaviors. Their performance is substantially hindered when the users' observed data is limited at an early stage, which needs to be improved to minimize financial loss. In this work, we propose Eland, a novel framework that uses action sequence augmentation for early anomaly detection. Eland utilizes a sequence predictor to predict next actions of every user and exploits the mutual enhancement between action sequence augmentation and user-action graph anomaly detection. Experiments on three real-world datasets show that Eland improves the performance of a variety of graph-based anomaly detection methods. With Eland, anomaly detection performance at an earlier stage is better than non-augmented methods that need significantly more observed data by up to 15% on the Area under the ROC curve.
description: CIKM'21
Μελέτη αέριας ρύπανσης στην περιοχή της Αττικής. Η περίπτωση της Ελευσίνας
Creators: name: Τζανετάτος, Γεράσιμος
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Αέρια ρύπανση
subject: Περιβαλλοντική πολιτική
subject: Ανανεώσιμες πηγές ενέργειας

description: Η μελέτη της αέριας ρύπανσης σε μία τόσο πυκνοκατοικημένη και βιομηχανοποιημένη περιοχή όπως είναι η Ελευσίνα και η ευρύτερη περιοχή του Θριασίου πεδίου είναι ιδιαίτερα σημαντική. Τα γεωλογικά στοιχεία της περιοχής, σε συνδυασμό με τα υδρολογικά, μορφολογικά και κλιματικά στοιχεία της, την καθιστούν ιδιαίτερα ευάλωτη στις εκπομπές των αέριων ρύπων όπως αυτοί εκπέμπονται από τις κατοικίες, τις βιοτεχνίες και τις βιομηχανίες της περιοχής. Τα προβλήματα με τις υψηλές συγκεντρώσεις των αέριων ρύπων αποτελούν σημαντικό παράγοντα υποβάθμισης της εν λόγω περιοχής, ωστόσο τα τελευταία χρόνια εφαρμόστηκαν μία σειρά από περιβαλλοντικές πολιτικές οι οποίες συνετέλεσαν στη σταδιακή μείωση των εκπομπών των αέριων ρύπων της περιοχής με συνέπεια την περιβαλλοντική, αισθητική και οικονομική της αναβάθμιση. Στο τελευταίο κεφάλαιο εξετάζονται τα περιβαλλοντικά προβλήματα της μεγαλούπολης του Λονδίνου και το ποιές είναι οι περιβαλλοντικές πολιτικές που εφαρμόστηκαν ούτως ώστε να γίνουν σημαντικά βήματα προόδου όσον αφορά τη μείωση των εκπομπών των αέριων ρύπων και την περιβαλλοντική αναβάθμιση της πόλης του Λονδίνου.
Nicotine‐free, nontransgenic tobacco (Nicotiana tabacum L.) edited by CRISPR‐Cas9
Creators: name: Schachtsiek, Julia
name: Stehle, Felix
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: CRISPR-Cas9
subject: Nicotine-free
subject: Gene editing
subject: Nontransgenic
subject: Nicotiana tabacum
subject: 660

description: Plant Biotechnol J;17(12)
Brane-world cosmology
Creators: name: Wands, David
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Brane-world models, where observers are restricted to a brane in a higher-dimensional spacetime, offer a novel perspective on cosmology. I discuss some approaches to cosmology in extra dimensions and some interesting aspects of gravity and cosmology in brane-world models.
description: 16 pages, 4 figures, to appear in proceedings of ERE2005, the XXVIII Spanish Relativity Meeting, Oviedo, Spain
THE VALUE TO CONSUMERS OF GM FOOD LABELS IN A MARKET WITH ASYMMETRIC INFORMATION: EVIDENCE FROM EXPERIMENTAL AUCTIONS
Creators: name: Huffman, Wallace E.
name: Shogren, Jason F.
name: Rousu, Matthew C.
name: Tegene, Abebayehu
name: Huffman, Wallace E.
name: Shogren, Jason F.
name: Rousu, Matthew C.
name: Tegene, Abebayehu
Publisher: name: Unknown
Year: 2001
Subjects: Consumer/Household Economics
Research and Development/Tech Change/Emerging Technologies

description: With the controversy over genetically modified (GM) foods continuing to grow, there has been a major push for mandatory labeling of GM foods by consumer advocacy and environmental groups in the United States. These groups maintain that consumers would benefit from labels. Other groups think that requiring mandatory GM food labels would be too costly, or could confuse consumers. Currently the United States has voluntary labeling policy for GM foods, but several other countries require mandatory labeling. Implementing a mandatory labeling policy in the United States would involve costs, both variable and fixed, and would have benefits. This paper presents empirical evidence on consumers' willingness to pay for foods with and without GM labels using laboratory auction experiments for three food items. These experiments used a randomly selected sample of 174 individuals from two Midwestern U.S. cities, Des Moines, Iowa and St. Paul, Minnesota. Our results indicate that consumers will pay less for a food that is labeled as genetically modified than for the counterpart food product with a standard food label. The average premium that consumers were willing to pay for the food with the standard label was fourteen percent. We also finds that how consumers receive the information on whether a good is genetically modified significantly impacts willingness to pay for GM labeled food - the sequence of bidding on GM foods matters. Our study suggests the discounting for GM foods does not depend on demographic characteristics of consumers. Household income, gender, and marital status are among variables that do not appear to matter in consumer views towards GM foods.
Effects of a mixed vector-scalar screened Coulomb potential for spinless particles
Creators: name: de Castro, Antonio S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The problem of a spinless particle subject to a general mixing of vector and scalar screened Coulomb potentials in a two-dimensional world is analyzed and its bounded solutions are found. Some unusual results, including the existence of a bona fide solitary zero-eigenmode solution, are revealed for the Klein-Gordon equation. The cases of pure vector and scalar potentials, already analyzed in previous works, are obtained as particular cases.
description: 13 pages, 2 figures
title: Innovative customer behavior forecasting framework for subscription-based organizations
title: Καινοτόμο πλαίσιο πρόβλεψης συμπεριφοράς πελατών συνδρομητικών οργανισμών
titleType: AlternativeTitle
Creators: name: Κατελάρης, Λεωνίδας
name: Katelaris, Leonidas
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Customer behavior forecasting
subject: Customer churn
subject: Customer churn framework
subject: Information systems
subject: Machine learning

description: Συνδρομητικοί οργανισμοί όπως εταιρίες λογισμικού, τηλεπικοινωνιακοί οργανισμοί, συνδρομητικές πλατφόρμες τηλεόρασης, οργανισμοί παροχής ηλεκτρικής ενέργειας και άλλοι, βρίσκονται σε μία διαρκή αναζήτηση τρόπων διατήρησης και αύξησης του πελατολογίου και του τζίρου τους καθώς αυτά αποτελούν θέματα ζωτικής σημασίας για τη βιωσιμότητα και την ανάπτυξη τους. Η παρούσα διπλωματική διατριβή εστιάζει στη μελέτη της απώλειας πελατών (customer churn) συνδρομητικών οργανισμών και στη δημιουργία ενός πλαισίου (framework) που μπορεί να χρησιμοποιηθεί ως εργαλείο λήψης αποφάσεων για τη μείωση της απώλειας και την αύξηση της αποτελεσματικότητας. Η απώλεια πελατών έχει αναδειχθεί σε μείζον ζήτημα για τους συνδρομητικούς οργανισμούς, καθώς έχει αρνητικό αντίκτυπο στην αγορά ενώ παράλληλα επηρεάζει την ανάπτυξη και την κερδοφορία τους. Η μη κατανόηση της απώλειας αυτής μπορεί να μετατραπεί σε συστηματική και να απειλήσει την ύπαρξη του ιδίου του οργανισμού. Για το λόγο αυτό, αρκετοί πάροχοι συνδρομητικών υπηρεσιών έχουν επενδύσει σημαντικούς πόρους (π.χ., οικονομικούς, ανθρώπινο δυναμικό) στην αναζήτηση λύσεων για την αντιμετώπιση του εν λόγω προβλήματος. Το φαινόμενο αυτό έχει προσελκύσει το ενδιαφέρον πληθώρας ερευνητών, από τον ακαδημαϊκό και επιχειρηματικό κόσμο, που αποσκοπούν στη καλύτερη κατανόηση και βελτίωση της πρόβλεψης της πιθανής απώλειας πελατών με σκοπό την έγκαιρη αντιμετώπιση και πρόληψη της.
Το επενδυτικό προφίλ των Ταμείων Επαγγελματικής Ασφάλισης στην Ελλάδα
Creators: name: Καπόγιαννης, Παναγιώτης
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2021
Subjects: subject: Επενδυτική στρατηγική
subject: Ταμεία Επαγγελματικής Ασφάλισης

description: Η παρούσα εργασία εξετάζει το μείζον θέμα του ασφαλιστικού στη χώρα μας εστιάζοντας στον δεύτερο πυλώνα ασφάλισης. Παρουσιάζει το πλαίσιο λειτουργίας των Ταμείων Επαγγελματικής Ασφάλισης στην Ελλάδα καθώς και αιτίες της επιβραδυμένης ανάπτυξης τους. Μέσα από ένα ερωτηματολόγιο 10 ερωτήσεων που απευθύναμε στα ΤΕΑ, αναδεικνύονται χρήσιμες πληροφορίες σχετικές με την επενδυτική στρατηγική τους, τις εκτιμήσεις τους για το εγγύς μέλλον αλλά και την βαρύτητα της ηλικίας των μελών τους στον καθορισμό της επενδυτικής στρατηγικής τους. Στο ίδιο πλαίσιο παρουσιάζονται και δυο μελέτες περιπτώσεων. Εμβαθύνοντας την ανάλυση, διεξάγεται μια εμπειρική έρευνα, ώστε να διερευνηθεί κατά πόσο ο βαθμός αποστροφής του κινδύνου ενός επενδυτή επηρεάζει την επένδυση της περιουσίας του σε ένα risky asset από την ηλικία των 20 ετών έως την ηλικία που συνταξιοδοτείται (65 ετών). Η δεύτερη μελέτη εστιάζει στην διερεύνηση της επίδρασης που έχει η οποιαδήποτε μεταβολή του χρηματιστηρίου στον μισθό και την περιουσία του επενδυτή.
A simple model for the evolution of disc galaxies: The Milky Way
Creators: name: Naab, Thorsten
name: Ostriker, Jeremiah P.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A simple model for the evolution of disc galaxies is presented. We adopt three numbers from observations of the Milky Way disc, the local surface mass density, the stellar scale length (of the assumedly exponential disc) and the amplitude of the (assumedly flat) rotation curve, and physically, the (local) dynamical Kennicutt star formation prescription, standard chemical evolution equations assuming and a model for spectral evolution of stellar populations. We can determine the detailed evolution of the model with only the addition of standard cosmological scalings with time of the dimensional parameters. A surprising wealth of detailed specifications follows from this prescription including the gaseous infall rate as a function of radius and time, the distribution of stellar ages and metallicities with time and radius, surface brightness profiles at different wavelengths, colours etc. At the solar neighbourhood stars start to form $\approx 10 Gyrs$ ago at an increasing rate peaking 4 billion years ago and then slowly declining in good agreement with observations. The mean age of long lived stars at the solar neighbourhood is about $4 Gyrs$. The local surface density of the stars and gas are 35 and $15 M_{\odot}pc^{-2}$, respectively. The metallicity distribution of the stars at the solar radius is narrow with a peak at $[Z/Z_{\odot}] = -0.1$.Both a Salpeter IMF and a Chabrier IMF are consistent with observations. Comparisons with the current and local fossil evidence provides support for the model which can then be used to assess other local disc galaxies, the evolution of disc galaxies in deep optical surveys and also for theoretical investigations such as simulations of merging disc galaxies (abbreviated).
description: acceppted for publication in MNRAS
Thermodynamics of Graviton Condensate
Creators: name: Alfaro, Jorge
name: Mancilla, Robinson
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this work, we present the thermodynamic study of a model that considers the black hole as a condensate of gravitons. In this model, the spacetime is not asymptotically flat because of a topological defect that introduces an angle deficit in the spacetime like in Global Monopole solutions. We have obtained a correction to the Hawking temperature plus a negative pressure associated with the black hole of mass $M$. In this way, the graviton condensate, which is assumed to be at the critical point defined by the condition $μ_{ch}$=0, has well-defined thermodynamic quantities $P$, $V$, $T_{h}$, $S$, and $U$ as any other Bose-Einstein condensate (BEC). In addition, we present a formal equivalence between the Letelier spacetime and the line element that describes the graviton condensate. We also discuss the Kiselev black hole, which can parametrize the most well-known spherically symmetric black holes. Finally, we present a new metric, which we will call the BEC-Kiselev solution, that allows us to extend the graviton condensate to the case of solutions with different matter contents.
description: 17 pages, 2 figures; Section III reconstructed, Added 2 Appendices, Added 2 references, typos corrected
title: Μεταφορές κι επενδύσεις: η περίπτωση των δεξαμενόπλοιων
title: Transport and investment: the case of tankers
titleType: AlternativeTitle
Creators: name: Μπαντζή, Μαρία
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Ναυτιλία
subject: Δεξαμενόπλοιο
subject: Επένδυση
subject: Ναυτιλιακός κύκλος
subject: Κόστη
subject: Ταμειακές ροές

description: Στην παρούσα μελέτη παρουσιάζεται η σύγκριση ενός δεξαμενόπλοιου, το οποίο έχει ήδη στην κατοχή της η εμπορική εταιρεία ΕΚΟ ΑΒΕΕ εδώ και είκοσι πέντε χρόνια με την αγορά ενός μεταχειρισμένου πενταετίας προηγμένης τεχνολογίας, για την κάλυψη των αναγκών της. Η ΕΚΟ ΑΒΕΕ θα είναι η μελέτη περίπτωσης της συγκεκριμένης διατριβής. Σκοπός είναι μέσα από τις ανάγκες της συγκεκριμένης εταιρείας να καταλήξουμε στην καλύτερη λύση επένδυσης, η οποία θα ενσωματώνει τεχνικές αξιολόγησης επενδύσεων . Είναι ορθό να τονίσουμε πως η διαδικασία της αξιολόγησης επενδύσεων αποτελεί μία πολύ σύνθετη διαδικασία η οποία από τη φύση της μπορεί να περιέχει μεγάλο βαθμό αβεβαιότητας και ρίσκου. Στο πρώτο μέρος της μελέτης παρουσιάζονται θεωρητικά στοιχεία για την ανάλυση της «ναυτιλιακής βιομηχανίας» ή γενικότερα της «ναυτιλίας», ώστε να κατανοήσουμε καλύτερα τη πορεία της και πως έχει γίνει αναπόσπαστο κομμάτι του ανθρώπινου παράγοντα. Θα επεκταθούμε στην έννοια των πλοίων, των χαρακτηριστικών τους, των απαιτούμενων διαδικασιών που εξασφαλίζουν την ασφαλή μεταφορά, καθώς και των ανθρώπων που μετέχουν σε αυτές, ώστε να έχουμε μια πλήρη εικόνα. Αναλύεται εκτενέστερα η έννοια του δεξαμενόπλοιου, καθώς είναι και το αντικείμενο της επένδυσής μας. Στο δεύτερο μέρος παρουσιάζονται οι ναυτιλιακοί κύκλοι, οι οποίοι θεωρούνται απαραίτητοι για τη διαδοχική ανάπτυξη του κλάδου της ναυτιλιακής βιομηχανίας. Μέσα από αυτούς ισορροπείται η προσφορά και η ζήτηση των μεταφορών. Οι δυσμενείς οικονομικές συνθήκες ή η ανάπτυξη επηρεάζουν άμεσα το τομέα της ναυτιλίας. Έρχονται με τη σειρά τους τα ναυτιλιακά έξοδα, τα οποία θα είναι η βάση μας για τη χρηματοοικονομική ανάλυση των δεξαμενόπλοιων που θα μελετήσουμε στο τρίτο μέρος της εργασίας. Είναι απαραίτητο να διαχωρίσουμε τα έξοδα ενός πλοίου, στην περίπτωσή μας δεξαμενόπλοιου, για να καταλήξουμε στο κατάλληλο συμπέρασμα της επένδυσης, με τη χρήση τεχνικών αξιολόγησης. Στο τρίτο μέρος, θα παρουσιαστεί η οικονομική εκτίμηση της ζητούμενης επένδυσης. Η υπό μελέτη επένδυση θα εξεταστεί αναλύοντας τα κόστη του ήδη υπάρχων πλοίου και του νέου υποψήφιου που επιβαρύνουν τον πλοιοκτήτη, καθώς και τα κέρδη. Με τη χρηματοοικονομική ανάλυση που θα παρουσιαστεί θα αναδειχθεί η αποδοτικότερη επένδυση.
title: Entrepreneurial education for persons with disabilities
title: a social innovation approach for inclusive ecosystems
titleType: AlternativeTitle
Creators: name: Krüger, Daniel
name: David, Alexandra
Publisher: name: Technische Universität Dortmund
Year: 2020
Subjects: subject: Entrepreneurial education
subject: Persons with disabilities
subject: Social innovation
subject: Inclusive learning ecosystem
subject: Co-creation
subject: Co-production
subject: Entrepreneurial skills
subject: Entrepreneurial ecosystem
subject: 300
subject: Sozialinnovation
subject: Teilhabe
subject: Behinderung

description: Fostering entrepreneurship and inclusive societies are on top of EU policy agenda. This article is bringing together both aims by discussing a social innovation framework for inclusive entrepreneurial education for persons with disabilities. Similar to other disadvantaged groups, persons with disabilities can benefit from entrepreneurial skills for self-management or, on a next level, for starting own, opportunity-driven businesses. The framework suggests several building blocks considered necessary for successful entrepreneurial education for the beneficiaries. First, it is approaching the framework through a social innovation perspective. In doing so, it suggests a social innovation ecosystem perspective to operationalize all relevant stakeholders and contextual aspects relevant for the framework. Second, it suggests to build on socially innovative, hence novel, practices by starting from co-creation and co-production in order to meet individual demands and needs of learners. Furthermore, it takes the concept of universal design into account as it holds major implications for inclusive entrepreneurial education for persons with disabilities and underlines the need of different, more suitable practices in entrepreneurship education and beyond, toward an inclusive learning ecosystem.
description: Front. Educ.;5
Metal Organic interfaces at the nanoscale
Creators: name: Troadec, Cedric
name: Jie, Deng
name: Kunardi, Linda
name: O'Shea, Sean J
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In this work, we present an investigation of the Ag-PPP (polyparaphenylene) interface using ballistic electron emission microscopy. Our work is the first successful application of the BEEM technique to metal-organic interfaces. We observe nanometer scale injection inhomogeneities. They have an electronic origin, since we find corresponding Schottky barrier variations. We also determine the transmission function of Ag-PPP interface and find that it agrees qualitatively with the theoretical calculations for a metal-phenyl ring interface. We conclude that charge transport across inhomogeneous barriers needs to be considered for understanding electronic transport across metal-organic interfaces and organic device characteristics.
Increased liver injury in patients with chronic hepatitis and IgG directed against hepatitis E virus
Creators: name: Sévédé, Daouda
name: Doumbia, Moussa
name: Kouakou, Viviane
name: Djehiffe, Vicky
name: Pineau, Pascal
name: Dosso, Mireille
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: Hepatitis E virus
subject: Seropositivity
subject: Aggravation of liver damage
subject: Côte d’Ivoire
subject: 610

description: Type-E hepatitis is responsible for more than three million symptomatic cases and more than 40,000 deaths worldwide. The situation of this hepatitis is overall poorly known in sub-Saharan Africa. Notably, the baseline circulation of HEV outside sporadic outbreaks has been barely characterized in this large region. More specifically, the impact of superinfection by this virus on the health status of the large reservoir of patients chronically infected with other hepatitis viruses remains to be evaluated. We searched for anti-HEV immunoglobulins in a series of 200 pregnant women and 92 patients with persistent liver infections with hepatitis B or C viruses and subsequently tried to assess serological co-variations with demographical and clinical features. We observed that only 1.5 % of expectant mothers were seropositive of anti-HEV IgG while it was the case for 18.4 % of patients with chronic liver diseases (P=4.5E-07). The presence of anti-HEV was not linked to any of the collected demographical features (age, sex, education, pork meat consumption, water supply, …). By contrast, the presence of anti-HEV was significantly associated with increased levels (1.6-1.8-fold, P<0.0001) of blood aminotransferases (AST, ALT) in patients with persistent hepatitis B or C. Our work indicates that, in Ivory Coast, the presence of IgG directed against HEV might contribute to a deterioration of liver health in patients with already installed persistent liver infections. The mechanisms explaining such phenomenon at distance of acute phase of infection are still unknown but might be linked either to a residual persistence of HEV in a context of general immune exhaustion or to an inappropriate auto-immune reaction as already observed in the aftermath of other viral infection types.
description: EXCLI Journal;Vol. 18 2019
Price Pooling and the Gains from Hedging: Application to a Swedish Grain Cooperative
Creators: name: Johnson, D. Demcey
name: Nilsson, Tomas K.H.
name: Andersson, Hans
name: Johnson, D. Demcey
name: Nilsson, Tomas K.H.
name: Andersson, Hans
Publisher: name: Unknown
Year: 2001
Subjects: subject: Agribusiness
subject: Marketing
subject: FOS: Economics and business

description: Optimal hedging strategies are analyzed for a cooperative operating a price pooling system in the presence of price and quantity risk. A three-period model, accounting for default risk and storage, is developed. Hedging allows the cooperative to increase the pool price offered to farmers by 2.8 - 4% for moderate risk parameters.
Periodic and discrete Zak bases
Creators: name: Englert, Berthold-Georg
name: Lee, Kean Loon
name: Mann, Ady
name: Revzen, Michael
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Weyl's displacement operators for position and momentum commute if the product of the elementary displacements equals Planck's constant. Then, their common eigenstates constitute the Zak basis, each state specified by two phase parameters. Upon enforcing a periodic dependence on the phases, one gets a one-to-one mapping of the Hilbert space on the line onto the Hilbert space on the torus. The Fourier coefficients of the periodic Zak bases make up the discrete Zak bases. The two bases are mutually unbiased. We study these bases in detail, including a brief discussion of their relation to Aharonov's modular operators, and mention how they can be used to associate with the single degree of freedom of the line a pair of genuine qubits.
description: 15 pages, 3 figures; displayed abstract is shortened, see the paper for the complete abstract