A generator of high-order embedded P-stable methods for the numerical solution of the Schrödinger equation

AbstractA generator of new embedded P-stable methods of order 2n+2, where n is the number of layers used by the embedded methods, for the approximate numerical integration of the one-dimensional Schrödinger equation is developed in this paper. These new methods are called embedded methods because of a simple natural error control mechanism. Numerical results obtained for one-dimensional differential equations of the Schrödinger type show the validity of the developed theory

The time evaluation of resistance probability of a closed community against to occupation in a Sznajd like model with synchronous updating: A numerical study

In the present paper, we have briefly reviewed Sznajd's sociophysics model and its variants, and also we have proposed a simple Sznajd like sociophysics model based on Ising spin system in order to explain the time evaluation of resistance probability of a closed community against to occupation. Using a numerical method, we have shown that time evaluation of resistance probability of community has a non-exponential character which decays as stretched exponential independent the number of soldiers in one dimensional model. Furthermore, it has been astonishingly found that our simple sociophysics model is belong to the same universality class with random walk process on the trapping space.Comment: 12 pages, 5 figures. Added a paragraph and 1 figure. To be published in International Journal of Modern Physics

The Integration of the Sea Bream and Sea Bass Market: Evidence from Greece and Spain

The relatively new aquaculture industry of sea bream and sea bass has grown rapidly in Mediterranean countries over the past decade. Greece is the leading production country and Spain is becoming the major market for the two species. Despite the importance of the industry, in that it contributes to the reduction of the EU trade deficit for fisheries products, and provides jobs in remote and rural areas, little effort has been made to analyse the market mainly due to its relatively low contribution to the GDP in production countries. This paper constitutes first step towards the understanding of the price formation mechanism for the market of sea bream and sea bass. Price data is used to test the hypothesis that a single European market for these species exists. Monthly price data are used to test the hypothesis for major markets in Greece and Spain. As most economic time series are non-stationary, cointegration is employed to assess the integration of the market

Assessment of the economic performance of the seabream and seabass aquaculture industry in the European Union

Production of gilthead seabream (Sparus aurata) and European seabass (Dicentrarchus labrax) is the second most important aquaculture industry in the European Union in value terms. During the last 10 years, the industry has experienced a process of industry concentration with the aim to overcome efficiency and profitability issues. However, the economic performance of the companies is still in general rather poor. The present work analyzes the economic performance of EU seabream and seabass companies in the period 2008?2016. The work is the first study to analyze companies? profitability in the EU as a whole, by country and company size, using economic and financial data extracted from companies? annual accounts. Based on the results, the study discusses the improvement of production and business profitability in recent years and the different factors that may have caused it, as well as the challenges and threats that seabream and seabass companies will have to face in order to achieve economic sustainability.This research was undertaken under the MedAID project, which has received funding from the European Union's Horizon 2020 Research and Innovation Programme under grant agreement no 727315 (http://www.medaid-h2020.eu/)

The decline of mussel aquaculture in the European Union: causes, economic impacts and opportunities

ABSTRATC: In contrast to the increasing aquaculture production of mussels worldwide, production in the European Union (EU) has shown a decreasing trend over the last two decades. Aquaculture production of mussels in the EU peaked in the late 1990s at more than 600 000 tonnes; by 2016, production volume had dropped by 20% to 480 000 tonnes. As mussel production represents more than 1/3 of EU aquaculture production, this decrease is an important contributor to the stagnation of EU aquaculture. Previous studies have suggested diseases, lack of mussel seed (spat), and low profitability as the main causes of the EU mussel production decrease. In this study, we investigate how economic and environmental factors have contributed. Moreover, we examine if the different mussel production techniques (raft, longline, on-bottom, and "bouchot") have been differently affected, by analysing the economic performance and cost structure evolution for the period 2010-2016. We complement these results with a SWOT (strengths, weaknesses, opportunities, and threats) analysis of the EU mussel sector based on expert knowledge

Current Status of Forecasting Toxic Harmful Algae for the North-East Atlantic Shellfish Aquaculture Industry

Across the European Atlantic Arc (Scotland, Ireland, England, France, Spain, and Portugal) the shellfish aquaculture industry is dominated by the production of mussels, followed by oysters and clams. A range of spatially and temporally variable harmful algal bloom species (HABs) impact the industry through their production of biotoxins that accumulate and concentrate in shellfish flesh, which negatively impact the health of consumers through consumption. Regulatory monitoring of harmful cells in the water column and toxin concentrations within shellfish flesh are currently the main means of warning of elevated toxin events in bivalves, with harvesting being suspended when toxicity is elevated above EU regulatory limits. However, while such an approach is generally successful in safeguarding human health, it does not provide the early warning that is needed to support business planning and harvesting by the aquaculture industry. To address this issue, a proliferation of web portals have been developed to make monitoring data widely accessible. These systems are now transitioning from “nowcasts” to operational Early Warning Systems (EWS) to better mitigate against HAB-generated harmful effects. To achieve this, EWS are incorporating a range of environmental data parameters and developing varied forecasting approaches. For example, EWS are increasingly utilizing satellite data and the results of oceanographic modeling to identify and predict the behavior of HABs. Modeling demonstrates that some HABs can be advected significant distances before impacting aquaculture sites. Traffic light indices are being developed to provide users with an easily interpreted assessment of HAB and biotoxin risk, and expert interpretation of these multiple data streams is being used to assess risk into the future. Proof-of-concept EWS are being developed to combine model information with in situ data, in some cases using machine learning-based approaches. This article: (1) reviews HAB and biotoxin issues relevant to shellfish aquaculture in the European Atlantic Arc (Scotland, Ireland, England, France, Spain, and Portugal; (2) evaluates the current status of HAB events and EWS in the region; and (3) evaluates the potential of further improving these EWS though multi-disciplinary approaches combining heterogeneous sources of information.Versión del edito

Orthodox dogma and ecumenicity in the work of Fr. Georges Florovsky

With this dissertation we attempt to respond to a view that has recently emerged in theological science and is related to Fr. G. Florovsky. In particular, several modern theologians, Greek and foreign, argue that the Russian theologian of the Diaspora was so much influenced by the Russian religious philosophy movement, that his dogmatic positions and theological views were borrowed from his compatriots. In this respect, there is a deliberate attempt to challenge the patristic background of the neopatristic synthesis proposed by him, and consequently of the neopatristic school he created within the Paris Saint-Sergius Institute, in order to present him in line with the modern current of his mentor Fr. S. Bulgakov. In the first part of the dissertation, we confirmed the already existing view in the literature, that the cosmology of Fr. Georges should be seen today as an attempt to respond to the corresponding heretical sophianic teaching of his Russian colleague. Therefore, Florovsky proposed the teaching of St. Gregory Palamas about the uncreated energies, in order to dogmatize that the union of the uncreated with the created is achieved freely through the actions of God and not deterministically, focusing on the sophianism of Fr. Sergius. By the term paradoxology of hell we suggest in the corresponding section, we mean the voluntary resistance of man to the will of God, which manifests itself as sin in the here life and continues as communion-punishment in the hereafter. In the second part of the dissertation we documented that Christian Hellenism is the philosophy of the Holy Spirit, which according to Florovsky is interpreted as the new science introduced by the Church Fathers and was called Christian philosophy or even better Christian dogma. As for Florovsky's dispute with Bulgakov, we have proved: a) that the core of their disagreement was the interpretation of patristic theology and tradition, b) in this respect we have shown that the beginnings of postpatristics have their starting point in the work of the Russian sophianist. In addition, we attempted to describe the vague term of neopatristic synthesis as a re-substantiation of orthodox theology in the patristic spirit or mindset, and we recorded its applications in the field of asceticpatristic culture and the interpatristic interpretation of history. In the third part we documented our view that the example of the neopatristic synthesis found its application in the ecumenical dialogue. In particular, at the 1st General Assembly in Amsterdam, the Russian theologian insisted on the criterion of apostolicity in order to find out that the true Church is the Orthodox. At the 2nd General Assembly in Evanston he stated that the dogmatic differences that characterize the members-churches of the Council are the ones that reveal the true ecumenicity. At the 3rd General Assembly in New Delhi, Fr. Georges argued that the protestant endeavor of ecumenism in space was a dead end and proposed ecumenism in time as a reintegration into the common patriarchal tradition of the Eastern and Western Churches.Με την παρούσα διατριβή επιχειρούμε να απαντήσουμε σε μια θεώρηση που ενέσκηψε πρόσφατα στη θεολογική επιστήμη και σχετίζεται με τον π. Γ. Φλωρόφσκυ. Συγκεκριμένα, αρκετοί σύγχρονοι θεολόγοι, Έλληνες και ξένοι, υποστηρίζουν ότι ο Ρώσος θεολόγος της διασποράς επηρεάστηκε τόσο πολύ από το κίνημα της ρωσικής θρησκειοφιλοσοφίας, ώστε οι δογματικές του θέσεις και οι θεολογικές του απόψεις να αποτελούν δάνεια των συμπατριωτών του. Υπό αυτήν την άποψη, παρατηρείται η εσκεμμένη προσπάθεια αμφισβήτησης του πατερικού υπόβαθρου της προτεινόμενης από τον ίδιο νεοπατερικής σύνθεσης, και κατ’ επέκταση της νεοπατερικής σχολής που δημιούργησε μέσα στους κόλπους του παρισινού Ινστιτούτου του Αγίου Σεργίου, προκειμένου έτσι να παρουσιαστεί σύστοιχος με το μοντέρνο ρεύμα του μέντορα του π. Σ. Μπουλγκάκωφ. Στο πρώτο μέρος της διατριβής επιβεβαιώσαμε την ήδη υπάρχουσα άποψη στη βιβλιογραφία, ότι η κοσμολογία του π. Γεωργίου, οφείλει να ιδωθεί σήμερα ως μια απόπειρα απάντησης στην αντίστοιχη αιρετική σοφιανική διδασκαλία του Ρώσου συναδέλφου του. Ως εκ τούτου, ο Φλωρόφσκυ πρόταξε τη διδασκαλία του αγίου Γρηγορίου Παλαμά περί των ακτίστων ενεργειών, για να δογματίσει ότι η ένωση του ακτίστου με το κτιστό επιτυγχάνεται ελεύθερα δια μέσω των ενεργειών του Θεού και όχι ντετερμινιστικά με άξονα τη σοφιανικότητα του π. Σεργίου. Με τον όρο παραδοξοντολογία της κόλασης που εισηγούμαστε στην αντίστοιχη ενότητα εννοούμε την οικειοθελή αντίσταση του ανθρώπου στο θέλημα του Θεού, που φανερώνεται ως αμαρτία στο ενθάδε και συνεχίζεται ως ακοινωνησία-τιμωρία στο επέκεινα. Στο δεύτερο μέρος της διατριβής τεκμηριώσαμε ότι ο χριστιανικός ελληνισμός είναι η φιλοσοφία του Αγίου Πνεύματος, η οποία σύμφωνα με τον Φλωρόφσκυ ερμηνεύεται ως το νέο επιστητό που εισήγαγαν οι πατέρες της εκκλησίας και ονομάστηκε χριστιανική φιλοσοφία ή χριστιανική δογματική. Όσον αφορά τη διαμάχη του Φλωρόφσκυ με τον Μπουλγκάκωφ αποδείξαμε: α) ότι ο πυρήνας της διαφωνίας τους ήταν η ερμηνεία της πατερικής θεολογίας και παράδοσης, β) υπό αυτήν την άποψη καταδείξαμε, ότι οι απαρχές της μεταπατερικότητας έχουν την αφετηρία τους στο έργο του Ρώσου σοφιανιστή. Επιπλέον επιχειρήσαμε να περιγράψουμε τον αδιευκρίνιστο όρο της νεοπατερικής σύνθεσης ως μια εκ νέου ενυποστασιοποίηση της ορθόδοξης θεολογίας στο πατερικό πνεύμα ή φρόνημα και καταγράψαμε τις εφαρμογές της στον τομέα του ασκητικοπατερικού πολιτισμού και της διαπατερικής ερμηνείας της ιστορίας. Στο τρίτο μέρος τεκμηριώσαμε την άποψη μας, ότι το παράδειγμα της νεοπατερικής σύνθεσης βρήκε την εφαρμογή του στον οικουμενικό διάλογο. Ειδικότερα στην 1η Γενική Συνέλευση στο Άμστερνταμ ο Ρώσος θεολόγος επέμενε στο κριτήριο της αποστολικότητας προκειμένου να διαφανεί ότι η αληθινή Εκκλησία είναι η ορθόδοξη. Στη 2η Γενική Συνέλευση στο Έβανστον δήλωσε ότι οι δογματικές διαφορές που χαρακτηρίζουν τα μέλη-εκκλησίες του Συμβουλίου είναι αυτές που φανερώνουν και την αληθινή οικουμενικότητα. Στην 3η Γενική Συνέλευση στο Νέο Δελχί ο π. Γεώργιος υποστήριξε ότι το προτεσταντικό εγχείρημα του οικουμενισμού στον χώρο ήταν αδιέξοδο και πρότεινε τον οικουμενισμό στον χρόνο ως επανένταξη στην κοινή αγιοπατερική παράδοση της ανατολικής και δυτικής εκκλησίας