cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Quantum supercurrent transistors in carbon nanotubes
Creators: name: Jarillo-Herrero, Pablo
name: van Dam, Jorden A.
name: Kouwenhoven, Leo P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Electronic transport through nanostructures is greatly affected by the presence of superconducting leads. If the interface between the nanostructure and the superconductors is sufficiently transparent, a dissipationless current (supercurrent) can flow through the device due to the Josephson effect. A Josephson coupling, as measured via the zero-resistance supercurrent, has been obtained via tunnel barriers, superconducting constrictions, normal metals, and semiconductors. The coupling mechanisms vary from tunneling to Andreev reflection. The latter process has always occurred via a normal-type system with a continuous density of states. Here we investigate a supercurrent flowing via a discrete density of states, i.e., the quantized single particle energy states of a quantum dot, or artificial atom, placed in between superconducting electrodes. For this purpose, we exploit the quantum properties of finite-sized carbon nanotubes (CNTs). By means of a gate electrode, successive discrete energy states are tuned ON and OFF resonance with the Fermi energy in the superconducting leads, resulting in a periodic modulation of the critical current and a non-trivial correlation between the conductance in the normal state and the supercurrent. We find, in good agreement with existing theory, that the product of the critical current and the normal state resistance becomes an oscillating function, in contrast to being constant as in previously explored regimes.
description: Main text and figures. For supplementary information, check Journal. Nature (in press)
title: Υλοποίηση Android εφαρμογής που απαιτεί τη λήψη αποφάσεων με πολλαπλά κριτήρια, εφαρμόζοντας τον αλγόριθμο Analytical Hierarchy Process (AHP)
title: Implementation of an Android application that requires decision-making with multiple criteria, using the Analytical Hierarchy Process (AHP) algorithm
titleType: AlternativeTitle
Creators: name: Τσιώτας, Κωνσταντίνος
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Android
subject: Analytical Hierarchy Process
subject: AHP
subject: Firebase
subject: Mobile application

description: Σκοπός της συγκεκριμένης Μεταπτυχιακής Διατριβής είναι η υλοποίηση της Android εφαρμογής «SmartCart» μέσω της οποίας θα πραγματοποιείται λήψη αποφάσεων μεταξύ πολλαπλών αντικρουόμενων κριτηρίων. Η εφαρμογή θα εφαρμόσει τον αλγόριθμο «Διαδικασία της Αναλυτικής Ιεράρχησης» (Analytical Hierarchy Process» (AHP)) για τη λήψη απόφασης για την προτεραιότητα των κριτηρίων αυτών. Η υλοποίηση μιας Android εφαρμογής η οποία δίνει τη δυνατότητα στο χρήστη να πραγματοποιεί τις αγορές του εύκολα και γρήγορα μέσω πολλαπλών σημείων επίσκεψης, και με τη βέλτιστη προτεινόμενη λύση, σύμφωνα με τις προτιμήσεις που έχει ορίσει ο ίδιος τη δεδομένη στιγμή. Ο χρήστης της εφαρμογής μπορεί να αναζητήσει μέσω μιας λίστας προϊόντων και να επιλέξει εκείνα που εκείνος επιθυμεί με ένα άγγιγμα, να δηλώσει τις προτιμήσεις του μεταξύ τεσσάρων κριτηρίων και να ζητήσει την συνεισφορά της εφαρμογής για την καλύτερη επιλογή. Η εφαρμογή αναλύει τα δεδομένα και επιστρέφει μία λίστα με τους προτεινόμενους συνδυασμούς των σημείων επίσκεψης όπου μπορούν να αγοραστούν τα επιλεγμένα προϊόντα. Τέλος, θα έχει τη δυνατότητα να προχωρήσει στην επιλογή και αγορά του επιθυμητού συνδυασμού. Η εφαρμογή SmartCart δίνει τη δύναμη στο χρήστη να αγοράσει τα προϊόντα που επιθυμεί συνδυάζοντας τα εξής βασικά κριτήρια: Κόστος - Απόσταση – Χρόνος – Αριθμός σημείων επίσκεψης.
The fate of $V_1$ vector leptoquarks: the impact of future flavour data
Creators: name: Hati, C.
name: Kriewald, J.
name: Orloff, J.
name: Teixeira, A. M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Motivated by the recent experimental progress on the $B$-meson decay anomalies (in particular the angular observables in $B\to K^\astμμ$), we rely on a simplified-model approach to study the prospects of vector leptoquarks in what concerns numerous flavour observables, identifying several promising decay modes which would allow to (indirectly) probe such an extension. Our findings suggest that the confirmation of the $B$-meson decay anomalies, in parallel with positive signals (at Belle II or LHCb) for $τ\to ϕμ$, $B_{(s)}$-meson decays to $τ^+ τ^-$ and $τ^+ μ^-$ ($τ^+ e^-$) final states, as well as an observation of certain charged lepton flavour violation decays (at COMET or Mu2e), would contribute to strengthen the case for this scenario. We also illustrate how the evolution of the experimental determination of $R_{D^{(*)}}$ could be instrumental in falsifying an explanation of the anomalous $B$-meson decay data via a vector $V_1$ leptoquark.
description: 42 pages, 7 figures, v3: takes into account updated $b\to s\ell\ell$ measurements, several improvements in the numerical analysis; conclusions unchanged, matches version published in EPJC
Casimir functions of free nilpotent Lie groups of steps three and four
Creators: name: Podobryaev, Alexey V.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Differential Geometry (math.DG)
subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 22E25, 17B08, 53C17, 35R03

description: Any free nilpotent Lie algebra is determined by its rank and step. We consider free nilpotent Lie algebras of steps 3, 4 and corresponding connected and simply connected Lie groups. We construct Casimir functions of such groups, i.e., invariants of the coadjoint representation. For free 3-step nilpotent Lie groups we get a full description of coadjoint orbits. It turns out that general coadjoint orbits are affine subspaces, and special coadjoint orbits are affine subspaces or direct products of nonsingular quadrics. The knowledge of Casimir functions is useful for investigation of integration properties of dynamical systems and optimal control problems on Carnot groups. In particular, for some wide class of time-optimal problems on 3-step free Carnot groups we conclude that extremal controls corresponding to two-dimensional coadjoint orbits have the same behavior as in time-optimal problems on the Heisenberg group or on the Engel group.
description: 19 pages
REGIONAL DISPARITIES IN SHARING THE GROSS NATIONAL PRODUCT
Creators: name: Maki, Wilbur R.
name: Maki, Wilbur R.
Publisher: name: Unknown
Year: 1984
Subjects: Community/Rural/Urban Development

description: The purpose of this paper is to account for the widening disparities in the principal measures of regional economic growth and well-being, starting with the Gross National Product and its regional distribution. Its focus is the measurement of recent state-level shifts in industry and population and the assessment of their implications for public intervention in private sector decision making.
Reconstructing regime-dependent causal relationships from observational time series
Creators: name: Saggioro, Elena
name: de Wiljes, Jana
name: Kretschmer, Marlene
name: Runge, Jakob
Publisher: name: arXiv
Year: 2020
Subjects: subject: Methodology (stat.ME)
subject: Optimization and Control (math.OC)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: Inferring causal relations from observational time series data is a key problem across science and engineering whenever experimental interventions are infeasible or unethical. Increasing data availability over the past decades has spurred the development of a plethora of causal discovery methods, each addressing particular challenges of this difficult task. In this paper we focus on an important challenge that is at the core of time series causal discovery: regime-dependent causal relations. Often dynamical systems feature transitions depending on some, often persistent, unobserved background regime, and different regimes may exhibit different causal relations. Here, we assume a persistent and discrete regime variable leading to a finite number of regimes within which we may assume stationary causal relations. To detect regime-dependent causal relations, we combine the conditional independence-based PCMCI method with a regime learning optimisation approach. PCMCI allows for linear and nonlinear, high-dimensional time series causal discovery. Our method, Regime-PCMCI, is evaluated on a number of numerical experiments demonstrating that it can distinguish regimes with different causal directions, time lags, effects and sign of causal links, as well as changes in the variables' autocorrelation. Further, Regime-PCMCI is employed to observations of El Niño Southern Oscillation and Indian rainfall, demonstrating skill also in real-world datasets.
The influence of size, depth and histologic characteristics of invasive ductal breast carcinoma on thermographic properties of the breast
Creators: name: Mance, Marko
name: Bulić, Krešimir
name: Antabak, Anko
name: Milošević, Milan
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: Invasive ductal breast carcinoma
subject: Thermography
subject: Breast cancer
subject: Estrogen receptor
subject: Progesterone receptor
subject: 610

description: Invasive breast carcinoma is the most common oncologic disease worldwide. The existing diagnostic methods use morphologic changes in the breast to diagnose a carcinoma when it has reached a certain size. Therefore, it is important to augment the morphologic diagnostic examinations with a new method that focuses on characteristics other than morphology such as electromagnetic changes produced by cancer. 50 adult female patients with confirmed ductal carcinoma following a core biopsy due to a suspicious breast mass were included in the study. They underwent breast thermography us ing a specially designed infrared camera. The data collected was statistically analyzed to determine how the presence of a tumor and its histologic characteristics influence breast thermographic properties. Twenty eight [56 %] patients in the study had an abnormal thermogram. Following statistical analysis, it was found that temperature of the diseased breast was directly correlated to tumor volume [p=0.009] and negatively correlated to depth of tumor [p=0.042]. Tumors that were ER+ and PR+ tumors produced warmer temperatures [p=0.017 and p=0.038 respectively] than tumors without these receptors. HER2 status and Ki-67 index had no statistical correlation with breast temperature. Tumor size, distance from the skin surface and receptor status cause changes in breast thermographic properties. Despite technical advances in the field of thermography, there are still contradictory results associated with thermography. Its diagnostic abilities are generally poorer than conventional methods and its use in breast cancer screening or as an adjunctive tool for diagnostic purposes is not recommended.
description: EXCLI Journal;Vol. 18 2019
ENERGY SUBSTITUTION POSSIBILITIES IN THE U.S. ECONOMY
Creators: name: Litterman, Mary
name: Litterman, Mary
Publisher: name: Unknown
Year: 1980
Subjects: Resource /Energy Economics and Policy

description: The major objective of this paper is to determine what impact energy prices have had on input substitution. If a micro approach is taken, it is felt that the actual reaction of output cannot be determined, as many macroeconomic forces also affect output in the economy. Determining the relationship of inputs, or the response of inputs, to increased energy prices is the first step in determining the effect higher energy prices have on the economy. Two models which estimate the relationship of inputs in the production process are presented in this paper using data for 20 manufacturing sectors and agriculture for 1947 to 1976.
Vortex glass transitions in disordered three-dimensional XY models: Simulations for several different sets of parameters
Creators: name: Olsson, Peter
Publisher: name: arXiv
Year: 2005
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The anisotropic frustrated 3D XY model with strong disorder in the coupling constants is studied as a model of a disordered superconductor in an applied magnetic field. Simulations with the exchange Monte Carlo method are performed for frustrations f=1/5 and f=1/4, corresponding to two different values of the magnetic field along the z direction. The anisotropy is also varied. The determination of the helicity modulus from twist histograms is discussed in some detail and the helicity modulus is used in finite size scaling analyses of the vortex glass transition. The general picture is that the behavior in [Phys. Rev. Lett. 91, 077002 (2003)] is confirmed. For strong (e.g. isotropic) coupling in the z direction the helicity modulus fails to scale and it is argued that this is due to a too small effective randomness of such systems for the accessible system sizes.
[Brev til DKNVS]
Creators: name: Trondhjems Legeforening
name: Det Kongelige Norske Videnskabers Selskab (DKNVS)
Publisher: name: Unknown
Year: 1848

description: Vedr. en skrivelse dat. 11. mars
description: Se 160035139. Polydoc nr. 1: 3348. Polydoc nr. 2: 2451.
The spin glass-antiferromagnetism competition in Kondo-lattice systems in the presence of a transverse applied magnetic field
Creators: name: Magalhaes, S. G.
name: Zimmer, F. M.
name: Coqblin, B.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A theory is proposed to describe the competition among antiferromagnetism (AF), spin glass (SG) and Kondo effect. The model describes two Kondo sublattices with an intrasite Kondo interaction strength $J_{K}$ and a random Gaussian interlattice interaction in the presence of a transverse field $Γ$. The $Γ$ field is introduced as a quantum mechanism to produce spin flipping and the random coupling has average $-2J_0/N$ and variance $32 J^{2}/N$. The path integral formalism with Grassmann fields is used to study this fermionic problem, in which the disorder is treated within the framework of the replica trick. The free energy and the order parameters are obtained using the static ansatz. In this many parameters problem, we choose $J_0/J \approx (J_{K}/J)^{2}$ and $Γ/J \approx (J_{K}/J)^{2}$ to allow a better comparison with the experimental findings. The obtained phase diagram has not only the same sequence as the experimental one for $Ce_{2}Au_{1-x}Co_{x}Si_{3}$, but mainly, it also shows a qualitative agreement concerning the behavior of the freezing temperature and the Neel temperature which decreases until a Quantum Critical Point (QCP).
description: 4 pages, 1 figure, accepted for publication in Physica B
Παράγοντες που επηρεάζουν την εργασιακή ικανοποίηση: μια προκαταρκτική έρευνα σε εμπορικές επιχειρήσεις
Creators: name: Καπνισάκης, Κωνσταντίνος
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2019
Subjects: subject: Εργασιακή ικανοποίηση
subject: Παράγοντες επαγγελματικής ικανοποίησης

description: Η παρούσα εργασία ασχολήθηκε με τη σημαντική έννοια της ικανοποίησης των εργαζόμενων και τον εντοπισμό των παραγόντων επιρροής της. Μια σημαντική μεταβλητή που εξετάστηκε ήταν η αντιληπτή ευελιξία στον εργασιακό χώρο, παράγοντας που δεν έχει μελετηθεί ενδελεχώς στην επιστημονική βιβλιογραφία. Η μεθοδολογία που υιοθετήθηκε ήταν ποσοτική, καθώς στόχος ήταν η επαλήθευση υποθέσεων, μέσω της τεκμηρίωσης αιτιωδών σχέσεων μεταξύ των υπό μελέτη μεταβλητών. Οι ερωτήσεις του ερευνητικού εργαλείου αποδείχθηκαν αξιόπιστες και έγκυρες σε ικανοποιητικό βαθμό. Ένας βασικός περιορισμός αποτελεί ότι οι συμμετέχοντες ήταν εργαζόμενοι μόνο μιας εταιρίας, επομένως δεν κατέστη δυνατή η συμμετοχή εργαζόμενων από άλλες εταιρίες του ίδιου κλάδου και ο εμπλουτισμός του δείγματος. Τέλος, η ευελιξία καταδείχθηκε ως σημαντικός παράγοντας επηρεασμού της ικανοποίησης των εργαζόμενων, όπως και η εξέλιξη και η ποιότητα της σχέσης με τον προϊστάμενο.
Crocetin promotes angiogenesis in human endothelial cells through PI3K-Akt-eNOS signaling pathway
Creators: name: Nasirzadeh, Mahdieh
name: Rasmi, Yousef
name: Rahbarghazi, Reza
name: Kheradmand, Fatemeh
name: Karimipour, Mojtaba
name: Aramwit, Pornanong
name: Astinfeshan, Maryam
name: Gholinejad, Zafar
name: Daeihasani, Behrokh
name: Saboory, Ehsan
name: Shirpoor, Alireza
name: Rezabakhsh, Aysa
name: Zolali, Elmira
name: Khalaji, Naser
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: Crocetin
subject: Human endothelial cells
subject: Angiogenesis
subject: Tube formation
subject: Migration
subject: VEGFR-2-Akt-eNOS signaling
subject: 610

description: Previous studies proved the pro-angiogenic effect of Crocetin, a natural carotenoid dicarboxylic acid, in both in vivo and in vitro models. However, the exact mechanism of Crocetin action has not completely been elucidated yet. The current experiment was designed to find the activity of PI3K-Akt-eNOS axis after the treatment of endothelial cells with Crocetin in vitro. Human Umbilical Vein Endothelial Cells (HUVECs) were incubated with various concentrations of Crocetin (1, 5, 25, 50, and 100 μM) over a period of 72 h. Crocetin significantly increased HUVECs viability after 72 h as compared with the control group. We also found that Crocetin promoted the formation of the capillary-like structure compared to the control (p<0.05). Moreover, an improved migration rate and increased MMP-9 activity were observed in HUVECs that received 50 μM Crocetin (p<0.05). Crocetin enhanced the uptake of Ac-LDL which is correlated with increased lipid metabolism. Based on the data from thecurrent experiment, protein level of VEGFR-1, -2 and p-Akt/Akt, p-eNOS/eNOS ratios were increased 72 h after the treatment of HUVECs with Crocetin (p<0.05). In contrast, the transcription level of VEGF was reduced in Crocetin-treated cells. These data demonstrated that Crocetin promotes HUVECs angiogenesis potential by the modulation of VEGF signaling pathway and increased cell viability. The PI3K/Akt/eNOS axis is required for a Crocetin-associated activity in endothelial cells.
description: EXCLI Journal;Vol. 18 2019
VERKNUPFUNG VON DATEN DES TATSACHLICHEN KAUFVERHALTENS MIT BEFRAGUNGSERGEBNISSEN UBER DAS BEKUNDETE KAUFVERHALTEN UND EINSTELLUNGEN VON VERBRAUCHERN
Creators: name: Niessen, Jan
name: Hamm, Ulrich
name: Niessen, Jan
name: Hamm, Ulrich
Publisher: name: Unknown
Year: 2006
Subjects: Consumer/Household Economics

description: In dieser Arbeit werden Befragungsdaten zum selbst eingeschätzten Kaufverhalten und zu Einstellungen, die begleitend zu einem Verbraucherpanel erhoben wurden, dem realisierten Kaufverhalten gegenüber gestellt. In Befragungen zum Kauf von Öko-Produkten neigen Käufer dazu, ihr Kaufverhalten deutlich zu überschätzen. Mit dem Vergleich von vorgeschalteten Screeningbefragungen zu Kaufhäufigkeiten und den Aufzeichnungen der realisierten Kaufakte werden Widersprüche zwischen bekundetem und tatsächlichem Kaufverhalten aufgedeckt und quantifiziert. Mittels Faktorenanalyse sind von den Teilnehmern abgegebene Einstellungsstatements verdichtet worden. Ein Vergleich der Faktorwerte von Öko-Käufern und Nicht-Käufern gibt Aufschluss darüber, in welchen Einstellungsbereichen sich diese beiden Käufergruppen signifikant voneinander unterscheiden.
Inferring the time-dependent complex Ginzburg-Landau equation from modulus data
Creators: name: Yu, Rotha P.
name: Paganin, David M.
name: Morgan, Michael J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We present a formalism for inferring the equation of evolution of a complex wave field that is known to obey an otherwise unspecified (2+1)-dimensional time-dependent complex Ginzburg-Landau equation, given field moduli over three closely-spaced planes. The phase of the complex wave field is retrieved via a non-interferometric method, and all terms in the equation of evolution are determined using only the magnitude of the complex wave field. The formalism is tested using simulated data for a generalized nonlinear system with a single-component complex wave field. The method can be generalized to multi-component complex fields.
description: 9 pages, 9 figures
PyLlama: a stable and versatile Python toolkit for the electromagnetic modeling of multilayered anisotropic media
Creators: name: Bay, Mélanie M.
name: Vignolini, Silvia
name: Vynck, Kevin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: PyLlama is a handy Python toolkit to compute the electromagnetic reflection and transmission properties of arbitrary multilayered linear media, including the case of anisotropy. Relying on a $4 \times 4$-matrix formalism, PyLlama implements not only the transfer matrix method, that is the most popular choice in existing codes, but also the scattering matrix method, which is numerically stable in all situations (e.g., thick, highly birefringent cholesteric structures at grazing incident angles). PyLlama is also designed to suit the practical needs by allowing the user to create, edit and assemble layers or multilayered domains with great ease. In this article, we present the electromagnetic theory underlying the transfer matrix and scattering matrix methods and outline the architecture and main features of PyLlama. Finally, we validate the code by comparison with available analytical solutions and demonstrate its versatility and numerical stability by modelling cholesteric media of varying complexity. A detailed documentation and tutorial are provided in a separate user manual. Applications of PyLlama range from the design of optical components to the modelling of polaritonic effects in polar crystals, to the study of structurally coloured materials in the living world.
Η φορολογική μεταρρύθμιση στην Ελλάδα στα χρόνια της οικονομικής κρίσης
Creators: name: Ζιάγκα, Ελένη
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2020
Subjects: subject: Φορολογικές μεταρρυθμίσεις
subject: Οικονομικές κρίσεις
subject: Φορολογία εισοδήματος
subject: Φορολογικό σύστημα

description: Ο Augusto Lopez Claros, διευθυντής του τμήματος Παγκοσμίων Δεικτών και Ανάλυσης στο World Bank Group υποστηρίζει ότι ο μεγάλος αριθμός φορολογικών μεταρρυθμίσεων αποδεικνύει ότι η βελτίωση του φορολογικού συστήματος είναι σημαντική για τις κυβερνήσεις των χωρών. Η διαπίστωση αυτή επαληθεύεται και στην Ελλάδα καθώς βασική εξαγγελία κάθε υπουργού Οικονομικών είναι η φορολογική μεταρρύθμιση. Στην παρούσα εργασία θα εξετάσουμε τις δράσεις που πραγματοποιήθηκαν σε όλα τα επίπεδα και όχι μόνο στο νομοθετικό στη διάρκεια της κρίσης χρέους με την οποία ήρθε αντιμέτωπη η χώρα μας στις αρχές της δεκαετίας, με σκοπό τη φορολογική μεταρρύθμιση και σε πιο βαθμό αυτές είχαν ευεργετικά αποτελέσματα τόσο στο ίδιο το φορολογικό σύστημα όσο και στην πορεία των φορολογικών εσόδων. Ο Augusto Lopez Claros, διευθυντής του τμήματος Παγκοσμίων Δεικτών και Ανάλυσης στο World Bank Group υποστηρίζει ότι ο μεγάλος αριθμός φορολογικών μεταρρυθμίσεων αποδεικνύει ότι η βελτίωση του φορολογικού συστήματος είναι σημαντική για τις κυβερνήσεις των χωρών. Η διαπίστωση αυτή επαληθεύεται και στην Ελλάδα καθώς βασική εξαγγελία κάθε υπουργού Οικονομικών είναι η φορολογική μεταρρύθμιση. Στην παρούσα εργασία θα εξετάσουμε τις δράσεις που πραγματοποιήθηκαν σε όλα τα επίπεδα και όχι μόνο στο νομοθετικό στη διάρκεια της κρίσης χρέους με την οποία ήρθε αντιμέτωπη η χώρα μας στις αρχές της δεκαετίας, με σκοπό τη φορολογική μεταρρύθμιση και σε πιο βαθμό αυτές είχαν ευεργετικά αποτελέσματα τόσο στο ίδιο το φορολογικό σύστημα όσο και στην πορεία των φορολογικών εσόδων.
Investigation of the swelling behavior of hydrogels derived from high molecular weight Poly(2-Ethyl-2-Oxazoline)
Creators: name: Segiet, Dominik
name: Jerusalem, Robert
name: Katzenberg, Frank
name: Tiller, Jörg C.
Publisher: name: Technische Universität Dortmund
Year: 2020
Subjects: subject: Hydrogel
subject: LCST
subject: Thermoresponsive
subject: 660

description: Thermoresponsive hydrogels are of great importance as smart materials. They are usually composed of cross‐linked polymers with a lower critical solution temperature (LCST). Although much is known about networks of poly(N‐isopropylacrylamide), all other polymers are somewhat neglected. In this work, the temperature‐dependent swelling behavior of differently cross‐linked thermoresponsive poly(2‐ethyl‐2‐oxazoline) (PEtOx) hydrogels were investigated with regard to varying parameters of the network composition. It was found that the degrees of swelling of the hydrogels converge for a certain polymer/solvent system at a distinct temperature independent of its degree of cross‐linking. Furthermore, this temperature correlates with the LCST of the respective starting PEtOx. Its net chain molecular weight Mc only affects the maximum degree of swelling and thus, the swelling–deswelling rate of the hydrogel. The fundamental structure/property relations found in this study could be useful to predict the behavior of other thermoresponsive hydrogels.
description: Journal of polymer science;Vol 58. 2020, H.5, 747-755
POLICY ASSESSMENT AND DEVELOPMENT BY STAKEHOLDERS: A CROSS-COUNTRY ANALYSIS OF NATIONAL RECOMMENDATION ON ORGANIC FARMING POLICY IN 11 EUROPEAN COUNTRIES
Creators: name: Haring, Anna Maria
name: Vairo, Daniela
name: Dabbert, Stephan
name: Zanoli, Raffaele
name: Haring, Anna Maria
name: Vairo, Daniela
name: Dabbert, Stephan
name: Zanoli, Raffaele
Publisher: name: Unknown
Year: 2006
Subjects: subject: Agricultural and Food Policy
subject: Multi-stakeholder involvement
subject: policy learning
subject: organic farming policy

description: There is no single 'best way' of policy development. Bottom-up approaches to policy design and a broad debate among stakeholders facilitate policy learning and innovation. A novel approach of a bottom-up policy design process involving stakeholders is introduced. First results obtained by this methodology are presented. The outcomes of a large international effort in Mai 2004 in developing organic farming policy in Europe are presented: the synthesized results from 11 European countries (AT, CH, CZ, DE, DK, EE, GB, HU, IT, PL, SI) on the current situation of organic farming policy in Europe and policy recommendations for the development of the organic farming sector.
WILLINGNESS TO PAY TO AVOID HEALTH RISKS FROM PESTICIDES, A CASE STUDY FROM NICARAGUA
Creators: name: Garming, Hildegard
name: Waibel, Hermann
name: Garming, Hildegard
name: Waibel, Hermann
Publisher: name: Unknown
Year: 2006
Subjects: subject: Health Economics and Policy
subject: health risks of pesticides
subject: contingent valuation
subject: Nicaragua

description: A contingent valuation approach to assess the health effects of pesticides among Nicaraguan vegetable farmers is presented. Farmers' valuation of health is measured as willingness to pay (WTP) for low toxicity pesticides. Results show, that farmers are willing to spend about 28% of current pesticide expenditure for avoiding health risks. The validity of results is established in scope tests and a two-step regression model. WTP depends on farmers' experience with poisoning, income variables and pesticide exposure. The results can help in targeting of rural health policies and the design of programmes aiming to reduce negative effects of pesticides.
Dzyaloshinskii-Moriya and dipole-dipole interactions affect coupling-based Landau-Majorana-Stückelberg-Zener transitions
Creators: name: Grimaudo, Roberto
name: Nakazato, Hiromichi
name: Messina, Antonino
name: Vitanov, Nikolay V.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: It has been theoretically demonstrated that two spins (qubits or qutrits), coupled by exchange interaction only, undergo a coupling-based joint Landau-Majorana-Stückelberg-Zener (LMSZ) transition when a linear ramp acts upon one of the two spins. Such a transition, under appropriate conditions on the parameters, drives the two-spin system toward a maximally entangled state. In this paper, effects on the quantum dynamics of the two qudits, stemming from the Dzyaloshinskii-Moriya (DM) and dipole-dipole (d-d) interactions, are investigated qualitatively and quantitatively. The enriched Hamiltonian model of the two spins, shares with the previous microscopic one the same C2-symmetry which once more brings about an exact treatment of the new quantum dynamical problem. This paper transparently reveals that the DM and d-d interactions generate independent, enhancing or hindering, modifications in the dynamical behaviour predicted for the two spins coupled exclusively by the exchange interaction. It is worthy noticing that, on the basis of the theory here developed, the measurement of the time evolution of the magnetization in a controlled LMSZ scenario, can furnish information on the relative weights of the three kinds of couplings describing the spin system. This possibility is very important since it allows in principle to legitimate the choice of the microscopic model to be adopted in a given physical scenario.
description: 9 pages, 0 figures
Fluctuation theorem for constrained equilibrium systems
Creators: name: Gilbert, T.
name: Dorfman, J. R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We discuss the fluctuation properties of equilibrium chaotic systems with constraints such as iso-kinetic and Nosé-Hoover thermostats. Although the dynamics of these systems does not typically preserve phase-space volumes, the average phase-space contraction rate vanishes, so that the stationary states are smooth. Nevertheless finite-time averages of the phase-space contraction rate have non-trivial fluctuations which we show satisfy a simple version of the Gallavotti-Cohen fluctuation theorem, complementary to the usual fluctuation theorem for non-equilibrium stationary states, and appropriate to constrained equilibrium states. Moreover we show these fluctuations are distributed according to a Gaussian curve for long-enough times. Three different systems are considered here, namely (i) a fluid composed of particles interacting with Lennard-Jones potentials; (ii) a harmonic oscillator with Nosé-Hoover thermostatting; (iii) a simple hyperbolic two-dimensional map.
description: To appear in Phys. Rev. E
The Implementation of Need Analysis in English Education Study Program: A Community Service in Higher Education
Creators: name: Masduqi, Harits
Publisher: name: figshare
Year: 2025
Subjects: classificationCode: 390104
subject: English and literacy curriculum and pedagogy (excl. LOTE, ESL and TESOL)

description: Needs analysis is a set of procedures used to collect information about learners’ needs. In this study, the researchers conducted a community service project by conducting a needs analysis to investigate the learners’ needs in studying English language skills. This survey study involved 60 English students at an Islamic university in Malang City, Indonesia. Having collected and analyzed data from the questionnaire, the researchers found that most respondents in this study were willing to improve their speaking and writing skills. The students also found that some of the materials were not suitable for their needs and were occasionally boring. The researchers, therefore, suggest that the lecturers need to conduct a more thorough needs analysis and upgrade their teaching methods to attract the students to learn English more enthusiastically. The future needs analysis can be conducted at the beginning of the course, so the results can be used as the basis to modify existing academic materials and teaching methods that suit the learners’ needs more accurately.
Sustainable gold catalysis in water using cyclodextrin-tagged NHC-gold complexes
Creators: name: Sak, Hülya
name: Mawick, Matthias
name: Krause, Norbert
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: Cyclodextrins
subject: Gold catalysis
subject: Green chemistry
subject: Click reactions
subject: Recyclable catalysts
subject: 540

description: The synthesis of 10 water‐soluble β‐cyclodextrin‐tagged NHC‐gold(I) complexes is described. Key steps are nucleophilic substitutions, as well as, copper‐(CuAAC)‐ and ruthenium‐(RuAAC)‐catalyzed azide alkyne cycloadditions. Whereas the CuAAC reliably affords 1,4‐disubstituted 1,2,3‐triazoles, the regioselectivity of the RuAAC depends on the structure of the coupling partners. Permethylated cyclodextrin‐tagged NHC‐gold(I) complexes are soluble both in water and in organic solvents. They show excellent catalytic activity and recyclability in cyclization reactions of functionalized allenes and alkynes in bulk water. The enantioselective cycloisomerization of γ‐ and δ‐hydroxyallenes could be achieved with up to 38 % ee. Thus, it is possible to take advantage of the chirality of the cyclodextrin moiety for enantioselective gold‐catalyzed transformations.
description: ChemCatChem;Vol. 11, 2019, Issue 23, 5821-5829
MODELLIERUNG UND BEWERTUNG DER ENTKOPPELTEN DIREKTZAHLUNGEN - EINE ANWENDUNG DES LANDNUTZUNGSMODELLS PROLAND SOWIE DES BEWERTUNGS- UND MODELLRAHMENS CHOICE
Creators: name: Borresch, Rene
name: Weinmann, Bernd
name: Borresch, Rene
name: Weinmann, Bernd
Publisher: name: Unknown
Year: 2006
Subjects: Environmental Economics and Policy

description: Die Entkopplung der Direktzahlungen stellt neben Cross Compliance und Modulation das wesentliche Kernelement der Beschlüsse des Agrarministerrates vom Juni 2003 zur Reform der Gemeinsamen Agrarpolitik der EU dar. Ziel des Beitrags ist es, die Wirkungen der Entkopplung für eine benachteiligte Region in Hessen zu quantifizieren. Dazu wird der interdisziplinäre Modellverbund ITE2M (Integrated Tools for Ecological & Economic Modelling) herangezogen. Im Vergleich zu den Bedingungen der Agenda 2000 ist durch die Entkopplung der Prämienzahlungen mit einer Zunahme der Grünlandflächen zu rechnen. Eine regionale Nutzen-Kosten-Analyse unter Einbeziehung externer Effekte zeigt, dass die Wohlfahrt der Region durch die Entkopplung gesteigert wird, und zwar in erheblichem Maße durch verstärkt zufließende Transferzahlungen.
Medusina atava Walcott 1898
Creators: name: Moreau, Jean-David
name: Gand, Georges
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Basidiomycota
Agaricomycetes
Russulales
Hericiaceae
Medusina
Medusina atava

description: Medusina atava (Pohlig, 1892) Walcott, 1898 (Fig. 3A, B)
MATERIAL EXAMINED. — One specimen; M486_ 2022.1.9.
DESCRIPTION
The specimen is umbrella-shaped and 16 mm in diameter. The velum is locally visible, forming an up to 3.3 mm wide marginal thickening. The jellyfish bears 10, thin, quite straight and radially arranged furrows originating from the centre and corresponding to radial canals (Fig. 3A, B). Most furrows join the periphery of the jellyfish. The centre of the jellyfish shows an up to 8 mm wide, star-shaped and concave structure corresponding to the manubrium (Fig. 3A, B).
REMARKS Medusina atava was reported in Permian deposits from France (Gand et al. 1996), Germany (Schüppel 1984) and Italy (Ronchi & Santi 2003). In the Saint-Affrique Basin, both species Medusina atava and Medusina limnica Müller, 1978 are known from some Permian sites (Gand et al. 1996). However, Medusina is for the first time reported in the Permian deposits of the Rodez Basin. M. limnica is mainly distinguished from M. atava by showing a maximum of four radial canals. Amongst M. atava the number of radial canals is variable and can reach a number of ten (Schüppel 1984; Gand et al. 1996).
description: Published as part of Moreau, Jean-David & Gand, Georges, 2022, New data on the Permian ecosystem of the Rodez Basin: ichnofauna (traces of protostomians, tetrapods and fishes), jellyfishes and plants from Banassac-Canilhac (Lozère, southern France), pp. 975-987 in Geodiversitas 44 (31) on page 978, DOI: 10.5252/geodiversitas2022v44a31, http://zenodo.org/record/7342122
Compressibility of a two-dimensional extended Hubbard model
Creators: name: Calegari, E. J.
name: Magalhães, S. G.
name: Gomes, A A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The compressibility of an extended $d-p$ Hubbard model is investigated by the Roth's two-pole approximation. Using the factorization procedure proposed by Beenen and Edwards, superconductivity with singlet $d_{x^2-y^2}$-wave pairing is also considered. Within this framework, the effects of $d-p$ hybridization and Coulomb interaction $U$ on the compressibility are studied carefully. It has been found that the compressibility diverges and then it becomes negative near the half-filling. Within Roth's method, it has been verified that an important contribution for the negative compressibility comes from the spin-correlation term $$ present in Roth's band shift. This correlation function plays an important role due to its high doping dependence. Also, its effects in the band shift and consequently in the compressibility are pronounced near the half-filling. The numerical results show that the hybridization acts in the sense of suppressing the negative compressibility near half-filling. Finally, the possibility of a connection between the negative compressibility and the phase separation is also discussed.
description: 3 pages, 1 figure, accepted for publication in Physica B
title: The effects of L-carnitine supplementation on glycemic control
title: a systematic review and meta-analysis of randomized controlled trials
titleType: AlternativeTitle
Creators: name: Fathizadeh, Hadis
name: Milajerdi, Alireza
name: Reiner, Željko
name: Kolahdooz, Fariba
name: Asemi, Zatollah
Publisher: name: Technische Universität Dortmund
Year: 2019
Subjects: subject: L-carnitine
subject: Glycemic control
subject: Insulin resistance
subject: Meta-analysis
subject: 610

description: The findings of trials investigating the effect of L-carnitine administration on glycemic control are controversial. This meta-analysis of randomized controlled trials (RCTs) was performed to explore the effects of L-carnitine intake on glycemic control. Two authors independently searched electronic databases including MEDLINE, EMBASE, Cochrane Library, Web of Science, PubMed and Google scholar from 1990 until February 2019, in order to find relevant RCTs. 37 studies with 44 effect sizes met the inclusion criteria and were eligible for the meta-analysis. L-carnitine supplementation resulted in a significant reduction in fasting plasma glucose (FPG) (WMD: -4.57; 95 % CI: -6.88, -2.25), insulin (WMD: -1.21; 95 % CI: -1.85, -0.57), homeostatic model assessment for insulin resistance (HOMA-IR) (WMD: -0.67; 95 % CI: -0 .90, -0.44) and HbA1C concentrations (WMD: -0.30; 95 % CI: -0.47, -0.13). L-Carnitine supplementation significantly reduced FPG, insulin, HOMA-IR, and HbA1c levels.
description: EXCLI Journal;Vol. 18 2019
POSSIBILITIES AND PERSPECTIVES OF INTEGRATING HOUSEHOLD ANALYSIS IN CGE MODELS: THE CASE OF MEXICO
Creators: name: Mellado, Aida Gonzalez
name: Mellado, Aida Gonzalez
Publisher: name: Unknown
Year: 2006
Subjects: subject: Consumer/Household Economics
subject: Trade liberalization
subject: Mexico
subject: poverty alleviation
subject: household analysis
subject: GTAP

description: This paper offers a possibility of bringing household analysis into Computable General Equilibrium (CGE) modelling. In this research, the CGE model developed by the Global Trade Analysis Project (GTAP) is extended. The extended GTAP model splits private consumption into ten different household categories according to observed expenditure patterns for Mexico. The extended model is used to simulate possible effects on Mexican household categories which are carried out under three different trade liberalization scenarios.
Surface polaritons on left-handed cylinders: A complex angular momentum analysis
Creators: name: Ancey, Stéphane
name: Décanini, Yves
name: Folacci, Antoine
name: Gabrielli, Paul
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We consider the scattering of electromagnetic waves by a left-handed cylinder -- i.e., by a cylinder fabricated from a left-handed material -- in the framework of complex angular momentum techniques. We discuss both the TE and TM theories. We emphasize more particularly the resonant aspects of the problem linked to the existence of surface polaritons. We prove that the long-lived resonant modes can be classified into distinct families, each family being generated by one surface polariton propagating close to the cylinder surface and we physically describe all the surface polaritons by providing, for each one, its dispersion relation and its damping. This can be realized by noting that each surface polariton corresponds to a particular Regge pole of the $S$ matrix of the cylinder. Moreover, for both polarizations, we find that there exists a particular surface polariton which corresponds, in the large-radius limit, to the surface polariton which is supported by the plane interface. There exists also an infinite family of surface polaritons of whispering-gallery type which have no analogs in the plane interface case and which are specific to left-handed materials.
description: published version. v3: reference list corrected
Hawking radiation from nonrotating singularity-free black holes in conformal gravity
Creators: name: Zhang, Jun
name: Sun, Yuan
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the sparsity of Hawking radiation from nonrotating singularity-free black holes in conformal gravity. We give a rigorous bound on the greybody factor for massless scalar field and calculate the sparsity of Hawking radiation from the black hole. Besides, we investigate the dependence of the greybody factor and the sparsity of Hawking radiation on the conformal parameters. Our study shows that the Hawking radiation from the black hole is extremely sparse. When the conformal parameters are large, the increase of conformal parameters will lead to an even more sparse Hawking radiation, while to a less sparse Hawking radiation if the conformal parameters are small.
description: 10 pages, 3 figures, 6 tables, accepted version in Int. J. Mod. Phys. D
Resonance Overlap is Responsible for Ejecting Planets in Binary Systems
Creators: name: Mudryk, Lawrence R.
name: Wu, Yanqin
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A planet orbiting around a star in a binary system can be ejected if it lies too far from its host star. We find that instability boundaries first obtained in numerical studies can be explained by overlap between sub-resonances within mean-motion resonances (mostly of the j:1 type). Strong secular forcing from the companion displaces the centroids of different sub-resonances, producing large regions of resonance overlap. Planets lying within these overlapping regions experience chaotic diffusion, which in most cases leads to their eventual ejection. The overlap region extends to shorter-period orbits as either the companion's mass or its eccentricity increase. Our analytical calculations reproduce the instability boundaries observed in numerical studies and yield the following two additional results. Firstly, the instability boundary as a function of eccentricity is jagged; thus, the widest stable orbit could be reduced from previously quoted values by as much as 20%. Secondly, very high order resonances (e.g., 50:3) do not significantly modify the instability boundary despite the fact that these weak resonances can produce slow chaotic diffusion which may be missed by finite-duration numerical integrations. We present some numerical evidence for the first result. More extensive experiments are called for to confirm these conclusions. For the special case of circular binaries, we find that the Hill criterion (based on the critical Jacobi integral) yields an instability boundary that is very similar to that obtained by resonance overlap arguments, making the former both a necessary and a sufficient condition for planet instability.
description: Accepted for publication in the Astrophyical Journal. Consists of 8 pages, 6 figures
Οικονομία διαμοιρασμού και οι επιπτώσεις της στο κλάδο της ξενοδοχίας
Creators: name: Βούρτσα, Ουρανία
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2021
Subjects: subject: Οικονομία διαμοιρασμού
subject: Airbnb
subject: Τουρισμός
subject: Βραχυχρόνια μίσθωση

description: Η οικονομία διαμοιρασμού έχει εξελιχθεί ραγδαία την τελευταία δεκαετία χάρη στην ευελιξία του διαδικτύου. Τα τελευταία χρόνια έχει κάνει την εμφάνιση της τόσο στο πανελλαδικό όσο και σε παγκόσμιο επίπεδο με πρωτοφανή τρόπο. Η οικονομία διαμοιρασμού έχει επεκταθεί σε διάφορους κλάδους της επιχειρηματικότητα και ιδιαίτερα στον κλάδο του τουρισμού. Διαδικτυακές πλατφόρμες όπως είναι αυτή του Airbnb, χρησιμοποιείται στις περισσότερες πόλεις της Ευρώπης, ανάμεσα σε αυτές και η Αθήνα. Παρατηρήθηκε ότι η εξέλιξη αυτή έχει επηρεάσει ιδιαίτερα τον κλάδο του τουρισμού με διαφόρους τρόπους. Σε αυτή την διπλωματική εργασία, η οποία δημιουργήθηκε για εκπαιδευτικούς σκοπούς, διερευνήθηκε πως έχει επηρεάσει η διαδικτυακή πλατφόρμα του Airbnb την Ελλάδα αλλά και άλλες μεγάλες ευρωπαϊκές πόλεις. Ολοένα και περισσότεροι ιδιοκτήτες επιλέγουν να νοικιάσουν την κύρια ή εξοχική τους κατοικία μέσω Airbnb και να συμπληρώσουν το εισόδημά τους. Η βραχυχρόνια μίσθωση στην Ελλάδα έχει επηρεάσει όλη την χώρα και ιδιαίτερα την αθηναϊκή αγορά. Συγκεκριμένα, η χρήση της πλατφόρμας Airbnb φαίνεται να έχει αρνητικές επιπτώσεις στα έσοδα των τοπικών ξενοδοχείων, βλάπτοντας τους τοπικούς παρόχους εστίασης αλλά και τους εργαζόμενους των επιχειρήσεων αυτών. Τέλος πραγματοποιήθηκαν δύο swot αναλύσεις (μη βασισμένες σε κάποια δημοσιευμένη μελέτη), μια από την πλευρά της διαδικτυακής πλατφόρμας Airbnb και μια από την πλευρά του οικοδεσπότη παρέχοντας πολύτιμες πληροφορίες σχετικά με τις δυνατότητες, τα αδύνατα σημεία καθώς και τις ευκαιρίες και τις απειλές που μελλοντικά ενδέχεται να αντιμετωπίσουν.
Charged exciton emission at 1.3 $μ$m from single InAs quantum dots grown by metalorganic chemical vapor deposition
Creators: name: Cade, N. I.
name: Gotoh, H.
name: Kamada, H.
name: Tawara, T.
name: Sogawa, T.
name: Okamoto, H.
name: Nakano, H.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We have studied the emission properties of self-organized InAs quantum dots (QDs) grown in an InGaAs quantum well by metalorganic chemical vapor deposition. Low-temperature photoluminescence spectroscopy shows emission from single QDs around 1300 nm; we clearly observe the formation of neutral and charged exciton and biexciton states, and we obtain a biexciton binding energy of 3.1 meV. The dots exhibit an s-p shell splitting of approximately 100 meV, indicating strong confinement.
description: 3 pages, 3 figures, submitted APL