cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: The effects of yarrow (Achillea millefolium) and herbal supplements on growth performance and nutrient utilisation of broiler chickens
Creators: name: Lewis, Michelle Rhiannon
Publisher: name: The Open University
Year: 2005

description: The use of antimicrobial growth promoters in European poultry production will be banned in 2006, which has made it economically viable to investigate the use of other acceptable compounds, such as botanical products. Botanical products have a wide range of known pharmacological effects which could be exploited, for example carvacrol, found in oregano, has antibacterial properties. Six experiments investigated the effects of botanical products on broiler growth performance. Two experiments were carried out to identify potentially useful products from a choice of six (garlic - Allium sativum, horseradish - Amoracia rusticana, juniper - Juniper communis, milk thistle - Silybum marianum, oregano - Origanum vulgare and yarrow - Achillea millefolium). Garlic powder and yarrow supplementation improved FCE (P>0.05) by 12 and 13% relative to controls in the second experiment. Two further experiments were floor-pen studies to examine the effects of both garlic and yarrow on growth performance. No performance benefits were associated with garlic supplementation (P>0.05). Feeding yarrow supplemented diets resulted in improved weight gain (P<0.05) during the grower phase but no effects on caecal microflora were detected (P>0.05) Yarrow contains 'bitter' sesquiterpene compounds (cadinene and germacrene), which may stimulate digestive enzyme production, so the fifth experiment examined the effects of dietary yarrow on digestive enzyme activity and nutrient availability of birds fed control and low nutrient density basal diets. Yarrow supplementation increased intestinal lipase activity and improved diet AME in birds fed high nutrient density diets but not in birds fed low nutrient density diets (yarrow x diet density interaction P<0.05). Therefore, the final experiment examined the interactions between yarrow supplementation and fat source. Yarrow supplementation improved growth performance (P<0.01) of birds fed saturated fat sources with a concomitant increase in gizzard bile acid concentrations (P<0.01), which may indicate increased gastrointestinal reflux.
title: Hannah Wadle. Social anthropologist and cultural activist. Telling the story of Steinort together – an experiment
Creators: name: Lachauer, Ulla
name: Kern, Agata
Publisher: name: Herder-Institut
Year: 2022
Subjects: subject: 943 Geschichte Mitteleuropas; Deutschlands

description: In 2009, Hannah Wadle settled in Sztynort to do research for her doctoral thesis – and stayed for a whole year. Gradually, her cautious explorations turned into familiarity and what began as a purely academic interest became a dedicated personal commitment to the town and its people. She learned to see the Lehndorff manor house from many perspectives. In 2017, she founded a cultural festival, and since then the palace has come to life every August.
On the stability of general relativistic geometric thin disks
Creators: name: Ujevic, Maximiliano
name: Letelier, Patricio S.
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The stability of general relativistic thin disks is investigated under a general first order perturbation of the energy momentum tensor. In particular, we consider temporal, radial and azimuthal "test matter" perturbations of the quantities involved on the plane $z=0$. We study the thin disks generated by applying the "displace, cut and reflect" method, usually known as the image method, to the Schwarzschild metric in isotropic coordinates and to the Chazy-Curzon metric and the Zipoy-Voorhees metric ($γ$-metric) in Weyl coordinates. In the case of the isotropic Schwarzschild thin disk, where a radial pressure is present to support the gravitational attraction, the disk is stable and the perturbation favors the formation of rings. Also, we found the expected result that the thin disk models generated by the Chazy-Curzon and Zipoy-Voorhees metric with only azimuthal pressure are not stable under a general first order perturbation
description: 11 pages, RevTex. Phys Rev D (in press)
Stabilization of a (3+1)D soliton in a Kerr medium by a rapidly oscillating dispersion coefficient
Creators: name: Adhikari, Sadhan K.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Using the numerical solution of the nonlinear Schroedinger equation and a variational method it is shown that (3+1)-dimensional spatiotemporal optical solitons can be stabilized by a rapidly oscillating dispersion coefficient in a Kerr medium with cubic nonlinearity. This has immediate consequence in generating dispersion-managed robust optical soliton in communication as well as possible stabilized Bose-Einstein condensates in periodic optical-lattice potential via an effective-mass formulation. We also critically compare the present stabilization with that obtained by a rapid sinusoidal oscillation of the Kerr nonlinearity parameter.
description: 6 pages, 6 ps figures, New figure 4 added, Physical Review E
title: Factors affecting foraging by breeding farmland birds
Creators: name: Murray, Kathryn Anne
Publisher: name: The Open University
Year: 2004

description: This thesis investigates nesting success, foraging behaviour, chick diet and growth of three ecologically contrasting species (skylark Alauda arvensis, yellowhammer Emberiza citrinella and song thrush Turdus philomelos) on farmland, in relation to microhabitat and the availability of invertebrates. Fieldwork was conducted on a lowland mixed arable farm in Leicestershire over the breeding seasons 2000 - 2002. Telemetry was used to monitor adult song thrushes and fledgling skylarks. Skylark nest density was highest in set-aside and lowest in crops, yellowhammer nest density was greatest in herbaceous vegetation and field margins whilst song thrush nest density was greatest in hedgerows and woodland. Birds did not utilise the available habitat at random for nesting. Provisioning skylarks and yellowhammers utilised managed set-aside strips more than would be expected, although both foraged in cereals. Song thrushes foraged primarily in woodland and boundary habitats, avoiding cereal crops, permanent pasture and set-aside. The largest cause of nest failure for each study species was predation. Skylark nest survival improved with increasing vegetation density at the nest site. Yellowhammer nest survival was affected by temperature and rainfall. Song thrush nest survival was affected by predator control, nest site location on the farm and habitat. Skylarks selected sparse vegetation and bare ground when foraging in winter cereals. Each species selected some invertebrate taxa over others, independently of chick age. Skylarks and yellowhammers did not forage in sites with greater invertebrate abundance than others, but song thrushes tended to forage in habitats with higher invertebrate biomass. Skylark chick growth rates were positively influenced by set-aside and negatively by spiders in the diet and the proportion of 'other habitats' around the nest. Skylark chicks with higher growth rates were more likely to fledge. No habitat effects or environmental factors were found to affect song thrush chick growth rates. Tagged skylark chicks exhibited a low post-fledgling survival rate, with most predated whilst flightless. This thesis identified actual and potential conservation benefits for nationally declining skylark, yellowhammer and song thrush populations arising from the management of cropped and non-cropped habitats.
Some sharp norm estimates in the subspace perturbation problem
Creators: name: Motovilov, Alexander K.
name: Selin, Alexei V.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: Primary 47A55; Secondary 47B25

description: We discuss the spectral subspace perturbation problem for a self-adjoint operator. Assuming that the convex hull of a part of its spectrum does not intersect the remainder of the spectrum, we establish an \textit{a priori} sharp bound on variation of the corresponding spectral subspace under off-diagonal perturbations. This bound represents a new, \textit{a priori}, $\tanΘ$ Theorem. We also extend the Davis--Kahan $\tan 2Θ$ Theorem to the case of some unbounded perturbations.
title: Kinematic morphology of space systems
Creators: name: Hobbs, John D.
Publisher: name: The Open University
Year: 2007

description: This thesis considers the robustness to faults of mechanical kinematic systems typical of the type applied to the locomotion sub-systems of planetary exploration vehicles. It is argued that, whereas the electronic, software and control methodologies for such kinematic systems have received extensive attention, the development of the theory supporting the corresponding mechanical architectures has not received the same level of attention. An introduction to the space systems context of the topic is provided, and used to illustrate the nature of the requirements that evolve for such missions, concentrating on aspects of'terrainability' - the suitability of a vehicle to manoeuvre on rough planetary surfaces. An approach is investigated which takes concepts from graph theory and linear algebra, and uses these to establish a means for representing kinematic topologies, and, in particular, the 'fault graph' structures, and 'fault classes' that result from the progressive application of faults to nominal kinematic system configurations. Ways whereby the eigenvalues and eigenvectors of the characteristic polynomials of the interchange graph adjacency matrices of various kinematic systems can be applied to represent such systems under nominal and fault conditions are investigated, including development of the 'constraints matrix'. Additionally, the relevance of entropy within a fault graph context is considered, and also techniques suggested for analysing systems in a way which allows a richer representation of the underlying kinematic structure. Various metrics are considered and a means is established whereby a selection of parameters representing some aspects of kinematic systems' behaviour is used in conjunction with these to provide a means of comparing system configurations with each other, in terms of several 'intersystem distance' measures. Some success was achieved - 'inter-system distances' were derived for a selection of systems exhibiting different topologies and showed that these can usefully be used to represent some aspects of kinematic system topologies. Some evidence was obtained that it is possible to discriminate between tree-based and looped systems using this method.
Measuring the district effect. Reflections on the literature
Creators: name: Becattini, Giacomo
name: Musotti, Francesco
Publisher: name: PSL Quarterly Review
Year: 2012
Subjects: subject: Industrial Districts
subject: D24, J21, J31, R23, R32

description: A group of researchers from Bank of Italy has been recently carrying out comparative investigations about different aspects of the Italian industrial districts experience, marking a turning point in this field of study. Their outcomes turn out to be essential at least from two standpoints. On the one hand, they provides reliable measurements of the performances acquired and consolidated by the districts. On the other one they paves the way for perspectives of future researches. In this paper, after a bird's eye view of Italian studies on industrial districts, the authors discuss some of those researchers' findings. This has been done with regards to three basic points: whether district firms are more productive than their competitors, thanks to the particular environment in which they operate; whether the advantages of district environment translate into an higher capacity to compete on international markets; the industrial district (so-called) labour market features. JEL Codes: D24, J21, J31, R23, R32
description: PSL Quarterly Review, V. 56, N. 226 (2003)
title: Wolfram Jäger. Professor im Blaumann. Baustelle Schloss Steinort
Creators: name: Lachauer, Ulla
name: Kern, Agata
Publisher: name: Herder-Institut
Year: 2022
Subjects: subject: 943 Geschichte Mitteleuropas; Deutschlands

description: Eines Tages hörte Wolfram Jäger im Radio vom katastrophalen Zustand des Lehndorffschen Schlosses. Der bekannte Spezialist für die Sanierung historischer Bauwerke hatte damals in Barcelona ein großes Projekt für die UNESCO abgeschlossen und fuhr sofort nach Masuren. Im Frühling 2011 traf er eine folgenschwere Entscheidung – ein Glück für das Schloss, für ihn eine Herkulesarbeit.
Ordering and Spin Waves in NaNiO2 : A Stacked Quantum Ferromagnet
Creators: name: Lewis, M. J.
name: Gaulin, B. D.
name: Filion, L.
name: Kallin, C.
name: Berlinsky, A. J.
name: Dabkowska, H. A.
name: Qiu, Y.
name: Copley, J. R. D.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Neutron scattering measurements on powder NaNiO2 reveal magnetic Bragg peaks and spin waves characteristic of strongly correlated s=1/2 magnetic moments arranged in ferromagnetic layers which are stacked antiferromagnetically. This structure lends itself to stacking sequence frustration in the presence of mixing between nickel and alkali metal sites, possibly providing a natural explanation for the enigmatic spin glass state of the isostructural compound, LiNiO2.
description: 6 pages, 5 figures, RevTex4, for higher resolution figures see published version
The process of european monetary integration: a comparison of the belgian and italian approaches
Creators: name: Maes, Ivo
name: Quaglia, Lucia
Publisher: name: PSL Quarterly Review
Year: 2012
Subjects: subject: EMU, Exchange Rates, Integration
subject: F31, F36

description: This paper analyses the roles which Belgium and Italy have played in the process of European monetary integration. It focusses on Belgian and Italian attitudes towards European integration and EMU, exchange rate policies, key concepts of the EMU strategies and concrete contributions. Overall, Belgium and Italy played an important and pace-setting role in the process of European monetary integration. The main difference is that Belgium has been a constant and consistent "pace-setter" in monetary matters, whereas Italy was mainly active in the 1980s. Furthermore, the paper shows how important it was for a country to achieve a sound economic performance, especially a stable exchange rate, in order to have influence on the European monetary scene. JEL Codes: F31, F36
description: PSL Quarterly Review, V. 56, N. 227 (2003)
Digitales Anwenderforum Bibliotheken 2022. Forschung im Alltag: Richtiges Datenmanagement als Basis für hochwertigen Forschungssupport
Creators: name: Strauch-Davey, Annette
Publisher: name: Zenodo
Year: 2022
Subjects: FDM
Forschungsdaten
Forschungsdatenmanagement
Bibliotheken

description: Dies sind die Folien vom Anwenderforum Bibliotheken 2022 (Lehmanns Media).  "Lehmanns Media lädt ein zum Anwenderforum Bibliotheken 2022:
 Diesmal dreht sich alles um Bibliotheken: Live-Diskussion zu Open Access aus Bibliothekssicht, internationaler Austausch zum globalen Wandel im Buchmarkt, innovative und prämierte Start-ups auch der Buch- und Medienbranche sowie interessante Anwendereinblicke aus verschiedenen Hochschulen – seien Sie dabei beim diesjährigen Lehmans Media Anwenderforum Bibliotheken 2022. Es erwartet Sie ein interessantes Programm mit vielen bekannten Referentinnen und Referenten " Beitrag: " Forschung im Alltag:
 Richtiges Datenmanagement als Basis für hochwertigen Forschungssupport"
Banking behaviour and the Brazilian economy after the Real Plan: The post-Keynesian approch
Creators: name: De Paula, Luiz-Fernando
name: Alves, Antonio J.
Publisher: name: PSL Quarterly Review
Year: 2012
Subjects: subject: Bank, Banking
subject: F33, G21, G28, O16, O19

description: This paper aims at analysing--from a Post Keynesian approach--the Brazilian banking behaviour in the current phase of the business cycle that is at the semi-stagnation state of the economy. According to the Post Keynesian approach, banks are economic agents that have liquidity preference determined strongly by their expectations under uncertainty, managing their portfolio according to the tradeoff between liquidity and profitability. We argue that banking behaviour in Brazil has been determined by the specific institutional-macroeconomic context of the current phase of the Brazilian economy, with banks taking advantage of the high rates of interest and the conditions in which government has managed its internal debt. But at the same time banking strategies are determinant of the current phase since portfolio allocation has been dominated by a short-termist behaviour and high liquidity preference that have resulted in low credit supply and high banking spread. JEL Codes: F33, G21, G28, O16, O19
description: PSL Quarterly Review, V. 56, N. 227 (2003)
Properties of dense partially random graphs
Creators: name: Risau-Gusman, Sebastian
Publisher: name: arXiv
Year: 2004
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We study the properties of random graphs where for each vertex a {\it neighbourhood} has been previously defined. The probability of an edge joining two vertices depends on whether the vertices are neighbours or not, as happens in Small World Graphs (SWGs). But we consider the case where the average degree of each node is of order of the size of the graph (unlike SWGs, which are sparse). This allows us to calculate the mean distance and clustering, that are qualitatively similar (although not in such a dramatic scale range) to the case of SWGs. We also obtain analytically the distribution of eigenvalues of the corresponding adjacency matrices. This distribution is discrete for large eigenvalues and continuous for small eigenvalues. The continuous part of the distribution follows a semicircle law, whose width is proportional to the "disorder" of the graph, whereas the discrete part is simply a rescaling of the spectrum of the substrate. We apply our results to the calculation of the mixing rate and the synchronizability threshold.
description: 14 pages. To be published in Physical Review E
Teaching Computational Thinking via Tangible and Graphical Interfaces -An Overview Through Reflective and Critical Lenses
Creators: name: Tsimplinas, Anastasios
name: Berki, Eleni
name: Juri-Petri Valtanen
name: Sapounidis, Theodosios
Publisher: name: figshare
Year: 2020
Subjects: subject: 130306 Educational Technology and Computing
subject: FOS: Educational sciences

description: Deeper learning and conceptual understanding are essential and critical elements for achieving learning process improvement in Computational Thinking (CT) curricula. For successful learning outcomes the school teachers of programming most probably have to familiarise themselves with two essential learning frameworks: i) tangible programming interfaces (TUIs), where real world objects are utilized to fulfil the programming process and assist in children’s abstraction skills; ii) graphical user interfaces (GUIs) or visual programming languages that involve the task of creating a structured program through the combination of graphical elements on a program canvas. Hence, this paper introduces the importance and readiness of teaching the programming concepts comprising CT in a creative and natural way. The authors present the rationale and current formal ways for teaching programming to primary school pupils. After a critical overview of some learning programming environments, the authors present and scrutinize the results between tangible and graphical interfaces (visual learning) from comparative studies.
Is a transactions tax an effective means to stabilize the foreign exchange market?
Creators: name: Terzi, Andrea
Publisher: name: PSL Quarterly Review
Year: 2012
Subjects: subject: Foreign Exchange
subject: F31, H87

description: The desirability of a transactions tax in the foreign exchange market, or Tobin tax, depends on whether the tax deters short-term, destabilizing trade. While supporters claim that the tax would be a deterrent for short-term capital flows, critics contend that the deterrent capability of the tax would be limited. This paper attempts to resolve some lingering questions about the arithmetic of a transactions tax, and concludes that a tax would raise the required return from trade for any time horizon, and thus deter all trades driven by small expected capital gains (i.e., smaller than the square of one plus the tax rate), and not necessarily those driven by a short horizon of the investor. The paper then explores the consequences of this result on the effectiveness of the tax within competing paradigms and concludes that a Tobin tax is not likely to be an effective means to reach the declared objectives. JEL Codes: F31, H87
description: PSL Quarterly Review, V. 56, N. 227 (2003)
The price level and monetary policy
Creators: name: Kindleberger, Charles P.
Publisher: name: PSL Quarterly Review
Year: 2012
Subjects: subject: Cost of Living, Interest Rates, Interest, Monetary Policy, Monetary, Policy, Price Level, Prices
subject: E52, E31

description: Most central banks are required to or choose to stabilize a price index, largely by manipulating short term interest rates. A serious problem is which index to choose among the national income deflator, wholesale prices, the cost of living, with or eliminating highly volatile commodities such as food and energy, to produce a core index, plus others such as housing, including or without imputed rent of owner-occupied houses, or assets, whether equities or houses. No obvious and widely agreed index exists. Even if there were a clear choice, there remains a question whether a central bank should carefully consider action in order to achieve other goals: full employment, adjustment of the balance of payments, of the exchange rate, prevention of bubbles in asset prices, or recovery from financial crises. If so, the question of central bank weapons remains: monetary expansion or contraction, credit controls, for overall or for particular purposes, and moral suasion. JEL Codes: E52, E31
description: PSL Quarterly Review, V. 55, N. 220 (2002)
DeePore: a deep learning workflow for rapid and comprehensive characterization of porous materials
Creators: name: Rabbani, Arash
name: Babaei, Masoud
name: Shams, Reza
name: Da Wang, Ying
name: Chung, Traiwit
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: DeePore is a deep learning workflow for rapid estimation of a wide range of porous material properties based on the binarized micro-tomography images. By combining naturally occurring porous textures we generated 17700 semi-real 3-D micro-structures of porous geo-materials with size of 256^3 voxels and 30 physical properties of each sample are calculated using physical simulations on the corresponding pore network models. Next, a designed feed-forward convolutional neural network (CNN) is trained based on the dataset to estimate several morphological, hydraulic, electrical, and mechanical characteristics of the porous material in a fraction of a second. In order to fine-tune the CNN design, we tested 9 different training scenarios and selected the one with the highest average coefficient of determination (R^2) equal to 0.885 for 1418 testing samples. Additionally, 3 independent synthetic images as well as 3 realistic tomography images have been tested using the proposed method and results are compared with pore network modelling and experimental data, respectively. Tested absolute permeabilities had around 13 % relative error compared to the experimental data which is noticeable considering the accuracy of the direct numerical simulation methods such as Lattice Boltzmann and Finite Volume. The workflow is compatible with any physical size of the images due to its dimensionless approach and can be used to characterize large-scale 3-D images by averaging the model outputs for a sliding window that scans the whole geometry.
title: Wolfram Jäger. A professor in overalls. The Steinort Palace construction site
Creators: name: Lachauer, Ulla
name: Kern, Agata
Publisher: name: Herder-Institut
Year: 2022
Subjects: subject: 943 Geschichte Mitteleuropas; Deutschlands

description: One day, Wolfram Jäger heard on the radio about the catastrophic condition of Lehndorff Palace. The well-known specialist in the restoration of historic buildings had recently completed a major project for UNESCO in Barcelona and immediately made his way to Masuria. In the spring of 2011, he made a momentous decision – a stroke of luck for the castle, a Herculean task for him.
ABDULLA QAHHORNING "ASROR BOBO" HIKOYASIDA QO'LLANILGAN FRAZEOLOGIK IBORALAR VA ULARNING MA'NOLARI
Creators: name: Po'latova, Maysara
Publisher: name: Zenodo
Year: 2025

description: Ushbu maqolada taniqli o‘zbek adibi Abdulla Qahhorning “Asror bobo” hikoyasida qo‘llanilgan frazeologik birliklar, frazemalar va ularning ma’nolari haqida fikr yuritiladi.
Central bank forecasts of liquidity factors and the control of short term interest rates
Creators: name: Bindseil, Ulrich
Publisher: name: PSL Quarterly Review
Year: 2012
Subjects: subject: Interest Rates, Interest
subject: E52, E58, E43

description: A simple model of the interaction between central bank liquidity management and the inter-bank overnight rate is suggested, which allows analysing the publication of forecasts of liquidity factors by the European Central Bank adopted in June 2000. The paper argues that the main practical advantage of the publication of these forecasts is that it makes the signal extraction problem with regard to the centralbank's intentions trivial and hence allows establishing a superior behavioural equilibrium between the central bank and the money market participants. In this equilibrium, the central bank can achieve a better steering of overnight rates than under private autonomous factor forecasts, depending of course also on the quality of liquidity forecasts. It is furthermore shown that the publication of an average of autonomous factors, such as adopted by the ECB, is, at least within the model presented, superior to the separate publication of autonomous factors for each single day. JEL Codes: E52, E58, E43
description: PSL Quarterly Review, V. 55, N. 220 (2002)
M&A flows and the foreign exchange markets:practical experiences
Creators: name: Schrijvers, Martijn A.
Publisher: name: PSL Quarterly Review
Year: 2012
Subjects: subject: Acquisition, Acquisitions, Exchange Rates, Financing, Foreign Exchange, Merger
subject: G34, F31, G32

description: The large cross-border Merger and Acquisition flows of the last three years were seen by financial markets as one of the factors behind movements in exchange rates. However, the extent to which an M&A-transaction actually leads to a foreign exchange transaction is dependent on the financing and transaction techniques used and is difficult to measure. In this article, we analyse which considerations underlie the decisions of corporate Treasurers regarding the financing of take-overs and the techniques to be used by forex transactions. We investigate the effect Treasurers believe M&A transactions have on exchange rates and examine whether different techniques make for different effects. The information was obtained through interviews with Treasurers of multinationals conducting large-scale M&A activities. JEL Codes: G34, F31, G32
description: PSL Quarterly Review, V. 55, N. 220 (2002)
A mixed integer-linear programming model for solving the hydroelectric unit maintenance scheduling problem
Creators: name: Tang, Yuehao
Publisher: name: University of British Columbia
Year: 2011

description: The unit maintenance scheduling problem is traditionally a challenging topic for electric utilities. In general, the system operators schedule the generating units for maintenance periodically. Research on the maintenance scheduling problem started in 1960's in the last century and has continued until today. Although significant contributions were made as a results of this continuous investigations, but many of those approaches were made in specific areas as different systems have their own special characteristics, such as system reliability considerations. According to the literature cited to-date, there is not one a successful case reported for maintenance scheduling of a pure hydro or hydro-dominated generating system. This thesis outlines an optimization modelling approach that is based on the linear programming techniques to solve the maintenance scheduling problem for hydro systems. This research focused on the potential use of mixed-integer/linear programming algorithms to solve the maintenance scheduling problem for a large scale hydroelectric system. The objective was to determine the best "timing" for each unit outage in the system. This thesis reformulated an existing hydro scheduling model and concentrated on the set of constraints that could effectively satisfy the maintenance scheduling requirements. The case studies carried out revealed that the most appropriate mixed-integer maintenance scheduling model would be formulated in such a way that it develops a maintenance schedule that ensures that the plants are operated in a way to maximize system efficiency and that head convergence have an influence on hydroelectric unit outage scheduling algorithm. Integer programming methods are usually considered suitable for maintenance scheduling problems, but in view of the complexities inherent in hydro models and in mixed-integer programming algorithms, it was found that it is very difficult to generalize one standardized approach to effectively handle this complex and large scale problem. Therefore, this research has focused on two main points. One focused on decreasing the number of possible binary variables in the model. The second focused on finding an appropriate algorithm that could approximate and reasonably simplify the computational process and transforms non-linear constraints into linear ones. It was also found that without specifically or delicately designing the maintenance scheduling constraints, the problem will be hard to solve even by the latest commercially available algorithms.
The Building of Online Communities: An approach for learning organizations, with a particular focus on the museum sector
Creators: name: Beler, Alpay
name: Borda, Ann
name: Bowen, Jonathan P.
name: Filippini-Fantoni, Silvia
Publisher: name: arXiv
Year: 2004
Subjects: subject: Computers and Society (cs.CY)
subject: Digital Libraries (cs.DL)
subject: FOS: Computer and information sciences
subject: H3.5; H3.7; H4.3; H5.2; H5.3; K3.1; K.4.0

description: This paper considers the move toward and potential of building online communities, with a particular focus on the museum sector. For instance, the increase in the use of `personalized' toolkits that are becoming an integral part of the online presence for learning organizations, like museums, can provide a basis for creating and sustaining communities. A set of case studies further illustrates working examples of the ways in which personalization and specific tools are developing collaborative spaces, community channels and group interactions.
description: (15 pages, 1 figure)
Introductory Programming Ecosystem for Children with Mobile Application
Creators: name: Tsimplinas, Anastasios
Publisher: name: figshare
Year: 2020
Subjects: subject: 130306 Educational Technology and Computing
subject: FOS: Educational sciences

description: Programming has an enormous presence in everyday life of 21 century. New generation students are surrounded by computer technology and will possibly do in the future an occupation that has not been invented yet. Digital literacy is the ability to understand and use digital technologies effectively for everyday tasks. Digital literacy is as important for children today as reading and writing skills. The aim of this thesis was to design and implement a mobile application for tablets that could introduce children to the basics of programming logic with an easy and interactive way. Children by playing with a friendly user interface will be able to understand better of what happens inside computers and also improve their math and logic skills. Using the tablet, children can develop their code by arranging different shapes-pieces-images-blocks that represent simple programming commands as part of a game. The blocks include basic functions as "move", loops as "repeat" and conditions as "if". Additionally children they could see the logic results and actions in reality as interaction with a Lego Mindstorms ™ EV3 robot. This will make them also more curious with the magical world of robotics. This master's thesis starts with an introduction on the importance of teaching young children concepts of programming and we continue with the exploration of the background and current state solutions in the area of children programming. After the taxonomy of the various programming environments we present comparative studies between the different interfaces. Based on the comparisons and studies we have explored, we propose a mobile application for tablets that is isomorphic with a tangible programming language that will create a full introductory programming ecosystem, ready to bridge the gap between the tangible and graphical solutions on the area of programming for children. As a conclusion we present the different issues raised during the design and development phase of our application and the future work we intent to carry out.
Differences between Robin and Neumann eigenvalues
Creators: name: Rudnick, Zeev
name: Wigman, Igor
name: Yesha, Nadav
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: Number Theory (math.NT)
subject: Spectral Theory (math.SP)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 35P20 (Primary) 37D50, 58J51, 81Q50, 11P21 (Secondary)

description: Let $Ω\subset \mathbb R^2$ be a bounded planar domain, with piecewise smooth boundary $\partial Ω$. For $σ>0$, we consider the Robin boundary value problem \[ -Δf =λf, \qquad \frac{\partial f}{\partial n} + σf = 0 \mbox{ on } \partial Ω\] where $ \frac{\partial f}{\partial n} $ is the derivative in the direction of the outward pointing normal to $\partial Ω$. Let $0
description: Several changes. Added references and comments about higher dimensions and variable Robin function
Economic sanctions and US international business interests
Creators: name: Askari, Hossein
name: Forrer, John
name: Teegen, Hildy
name: Yang, Jiawen
Publisher: name: PSL Quarterly Review
Year: 2012
Subjects: subject: International Business, Joint Venture, Policy, Trade
subject: F23, F13

description: Economic sanctions are seen as a foreign policy instrument less severe than military engagement but more potent than diplomacy. The assessment of the economic impact of sanctions invariably focuses on direct bilateral trade, with little regard to indirect costs. In the case of sanctions on Iran, the real cost to Iran and the U.S. is not so much due to reduced trade but to factors such as missed investment and joint venture opportunities, especially in the energy sector. The significant size of these costs for Iran will make it difficult for Iran to resume business as usual with U.S. companies when sanctions are lifted; and for U.S. energy companies, their long-term competitiveness in Iran and also globally will be reduced. JEL Codes: F23, F13
description: PSL Quarterly Review, V. 55, N. 220 (2002)
title: Bettina Bouresh. Leben für Schloss Steinort und eine unverhoffte Heimkehr
Creators: name: Lachauer, Ulla
name: Kern, Agata
Publisher: name: Herder-Institut
Year: 2022
Subjects: subject: 943 Geschichte Mitteleuropas; Deutschlands

description: „Ich bin ein typisches Nachkriegskind“, sagt Bettina Bouresh. 1950 geboren, aufgewachsen mit der deutschen Schuld und den Traumata ihrer mütterlichen Familie, die bis 1945 in Allenstein lebte. Sie selbst fühlte sich lange heimatlos. Bis sie eines Tages ihren Platz fand: in Masuren. Ein Zuhause – und im Schloss Steinort eine Lebensaufgabe. Heute ist sie Vize-Vorsitzende der Lehndorff-Gesellschaft.
A constraint on any topological lensing hypothesis in the spherical case: it must be a root of the identity
Creators: name: Roukema, Boudewijn F.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Three-dimensional catalogues of objects at cosmological distances can potentially yield candidate topologically lensed pairs of sets of objects, which would be a sign of the global topology of the Universe. In the spherical case, a necessary condition, which does not exist for either null or negative curvature, can be used to falsify such hypotheses, without needing to loop through a list of individual spherical 3-manifolds. This condition is that the isometry between the two sets of objects must be a root of the identity isometry in the covering space S^3. This enables numerical falsification of topological lensing hypotheses without needing to assume any particular spherical 3-manifold. By embedding S^3 in R^4, this condition can be expressed as the requirement that M^n = I for an integer n, where M is the matrix representation of the hypothesised lensing isometry and I is the identity. Moreover, this test becomes even simpler with the requirement that the two rotation angles, theta, phi, corresponding to the given isometry, satisfy 2π/ θ, 2π/ ϕ\in Z. The calculation of this test involves finding the two eigenplanes of the matrix M. A GNU General Public Licence numerical package, called eigenplane, is made available at http://cosmo.torun.pl/GPLdownload/eigen/ for finding the rotation angles and eigenplanes of an arbitrary isometry M of S^3.
description: 8 pages, 1 figure, accepted, Astronomy & Astrophysics, v2,v3 minor corrections, numerical caveats, matches accepted version
Pop competitiveness
Creators: name: Cellini, Roberto
name: Soci, Anna
Publisher: name: PSL Quarterly Review
Year: 2012
Subjects: subject: Competitiveness
subject: F13, F23, F32

description: Very few economic terms are used as much as competitiveness in economics. This article deals with the different meanings of competitiveness, at the level of a firm, at the level of the local area, and at the level of the country. It analyzes the problems of consistency among the available definitions and among the indicators used to measure competitiveness. JEL Codes: F13, F23, F32
description: PSL Quarterly Review, V. 55, N. 220 (2002)
Anchor, float or abandon ship: exchange rate regimes for the accession countries
Creators: name: Buiter, Willem H.
name: Grafe, Clemens
Publisher: name: PSL Quarterly Review
Year: 2012
Subjects: subject: EMU, Exchange Rates
subject: F33, P33

description: The paper considers alternative exchange rate regimes for the East European accession candidates, both prior to EU accession and following EU accession but prior to EMU membership. We conclude that, from an economic point of view, EMU membership should be as early as possible. There is, however, a risk that prevailing interpretations of the inflation and exchange rate criteria for EMU membership could lead to unnecessary delays in EMU membership for the accession countries. The exchange rate criterion for EMU membership requires that the candidate "has respected the normal fluctuation margins provided for by the exchange ratemechanism of the European Monetary System without severe tensions for at least the last two yeas before the examination." Both this text and the precedents of Finland, Italy and Greece, support the view that the exchange rate criterion can be satisfied without two years of formal ERMII membership. Insistence on at least two years of formal ERMII membership for the accession countries, would result in an unnecessary, costly and potentially risky stay in EMU purgatory. JEL Codes: F33, P33
description: PSL Quarterly Review, V. 55, N. 221 (2002)
title: Three essays on interest rates
Creators: name: Busetto, Filippo
Publisher: name: University of Reading
Year: 2023

description: In this thesis, I study various determinants of interest rates. In the first chapter, I
explore the empirical relationship between interest rates and debt supply expectations
derived from Treasury press releases in Italy and Germany. I find that news on expected
government bond supply affects bond yields, but only when news is an accurate reflection of future supply. Estimates obtained from a macro term-structure model confirm
that accurate expected supply is a significant factor in the time-variation of bonds’ risk
premia.
In the second empirical chapter, I study the conditional distribution of interest rates.
I focus on the changes in short-term interest rate expectations and term premia in the
United States, United Kingdom and Germany. A common macroeconomic factor has
an asymmetric effect on short-term interest rate expectations, as it shows in- and out-of-sample predictive ability above yield-based factors for significant negative changes in
future expected rates caused by a sizable easing in monetary policy. A deterioration in
this common factor affects points to the much stronger time variation of downside risk
for expected rates compared with upside risk. This finding contradicts the view that
monetary policy easings during crisis periods come as a surprise, while a tightening in
monetary policy during a business cycle upswing is more predictable.
In the third empirical chapter, I document the fiscal policy developments in the
main euro area economies over the last two decades and highlight the dramatic changes
triggered by the COVID-19 pandemic. In this context, I analyse how euro area yield
curves responded to COVID-19-related expectations of fiscal expansion. Specifically, I
show how fiscal constraints may affect interest rates and how an upward pressure on
country-specific sovereign yields caused by higher debt levels could compromise fiscal
and financial stability in the long term.
Collapse and Fragmentation in Finite Sheets
Creators: name: Burkert, Andreas
name: Hartmann, Lee
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present two-dimensional simulations of finite, self-gravitating gaseous sheets. Unlike the case of infinite sheets, such configurations do not constitute equilibrium states but instead are subject to global collapse unless countered by pressure forces or rotation. The initial effect of finite geometry is to promote concentrations of material at the edges of the sheet. If the sheet is not perfectly circular, gravitational focussing results in enhanced concentrations of mass. In the second-most simple geometry, that of an elliptical outer boundary, the general result is collapse to a filamentary structure with the densest concentrations of mass at the ends of the filament. We suggest that these simple calculations have interesting implications for the gravitational evolution of overall molecular cloud structure, envisioning that such clouds might originate as roughly sheetlike sections of gas accumulated as a result of large-scale flows in the local interstellar medium. We show some examples of local clouds with overall filamentary shape and denser concentrations of mass and star clusters near the ends of the overall extended structure, suggestive of our simple ellipse collapse calculations. We suggest that cluster-forming gas is often concentrated as a result of gravity acting on irregular boundaries; this mechanism can result in very rapid infall of gas which may be of importance to the formation of massive stars. This picture suggests that much of the supersonic ``turbulence'' observed in molecular clouds might be gravitationally-generated. Our results may provide impetus for further theoretical explorations of global gravitational effects in molecular clouds and their implications for generating the substructure needed for fragmentation into stars and clusters.
description: 30 pages, 16 figures
title: Bettina Bouresh. New life for Steinort Palace and an unexpected homecoming
Creators: name: Lachauer, Ulla
name: Kern, Agata
Publisher: name: Herder-Institut
Year: 2022
Subjects: subject: 943 Geschichte Mitteleuropas; Deutschlands

description: "I’m a typical post-war child," says Bettina Bouresh. Born in 1950, she grew up burdened with German guilt and the traumas of her mother's family, who had lived in Allenstein until 1945. She herself felt homeless for a long time. Until one day she found her place: in Masuria. Here she found a home – and in Steinort Palace her life’s work. Today she is vice-chairwoman of the Lehndorff Society.
What Can We Learn from Marine Geophysics to Study Rifted Margins?
Creators: name: Autin, Julia
name: Watremez, Louise
Publisher: name: arXiv
Year: 2024
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: This chapter describes the main geophysical methods used when studying offshore rifts and rifted margins. Geophysical data are often the only constraints available for interpretation of offshore rifted continental margins. Seismic reflection, refraction and potential fields are all valuable datasets carrying relevant information. In the absence of rock samples, geophysical methods are the only way to study rifted margins. They provide indirect imaging of the crust and sediments, as well as potential field data. There is a large spectrum of interpretations for rifted margins. Sometimes it is linked to the large diversity of rifted margins, sometimes it is linked to different geological scenarios. It is thus important to understand how each geological or geophysical object is recognized and their possible interpretation. In marine geophysics, the free-air gravity anomaly is computed from raw data.
A Hyperbolic Surface With A Square Grid Net
Creators: name: Geyer, Lukas
name: Merenkov, Sergei
Publisher: name: arXiv
Year: 2004
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 30F20, 30C25, 30D30

description: We prove the existence of a hyperbolic surface spread over the sphere for which the projection map has all its singular values on the extended real line, and such that the preimage of the extended real line under the projection map is homeomorphic to the square grid in the plane. This answers a question raised by È. B. Vinberg.
description: 9 pages, 4 figures; section 2 has been simplified and shortened; one figure added