Wind profile prediction using linear Markov chains: A linear algebra approach

To predict the future wind speed and wind direction is of relevance to the wind industry to maximize the power generation. In this regards, this article describes a methodology for the construction of predictive models based on linear Markov chains under linear algebra point of view. The model analyzes the direction and speed of the wind obtained from a meteorological station. This Model allows making a precise study of wind direction and speeding data; figure out the stability, the most common direction or speed, its behaviour depending on the hours or seasons.Peer ReviewedPostprint (author's final draft

Climate change impacts on crop yield of winter wheat (Triticum aestivum) and maize (Zea mays) and soil organic carbon stocks in northern China

Agricultural system models provide an effective tool for forecasting crop productivity and nutrient budgets under future climate change. This study investigates the potential impacts of climate change on crop failure, grain yield and soil organic carbon (SOC) for both winter wheat (Triticum aestivum L.) and maize (Zea mays L.) in northern China, using the SPACSYS model. The model was calibrated and validated with datasets from 20-year long-term experiments (1985–2004) for the Loess plateau, and then used to forecast production (2020–2049) under six sharing social-economic pathway climate scenarios for both wheat and maize crops with irrigation. Results suggested that warmer climatic scenarios might be favourable for reducing the crop failure rate and increasing the grain yield for winter wheat, while the same climatic scenarios were unfavourable for maize pro-duction in the region. Furthermore, future SOC stocks in the topsoil layer (0–30 cm) could increase but in the subsoil layer (30–100 cm) could decrease, regardless of the chosen crop

Random anisotropy disorder in superfluid 3He-A in aerogel

The anisotropic superfluid 3He-A in aerogel provides an interesting example of a system with continuous symmetry in the presence of random anisotropy disorder. Recent NMR experiments allow us to discuss two regimes of the orientational disorder, which have different NMR properties. One of them, the (s)-state, is identified as the pure Larkin-Imry-Ma state. The structure of another state, the (f)-state, is not very clear: probably it is the Larkin-Imry-Ma state contaminated by the network of the topological defects pinned by aerogel.Comment: JETP Lett. style, 6 pages, no figures, discussion extended, references added, version to be published in JETP Letter

Η εγκύκλιος επιστολή του πάπα Πίου Θ΄ προς την Ανατολή και η συνοδική απαντητική εγκύκλιος επιστολή των Πατριαρχών της Ανατολής (1848)

Η Εγκύκλιος Επιστολή των Ανατολικών Πατριαρχών είναι μια εγκύκλιος με την οποία οι Ανατολικοί Πατριάρχες απαντούν σε προγενέστερη Επιστολή του πάπα Πίου Θ΄ προς αυτούς (Litterae ad Orientale. In Suprema Petri Apostoli Sede). O πάπας Πίος ενθαρρυμένος από τις επιτυχίες στην εξωτερική πολιτική του Βατικανού τον Ιανουάριο του 1848 αποφάσισε να απευθυνθεί στους Ανατολικούς Ορθοδόξους Χριστιανούς και να ζητήσει να οδηγηθούν στην ένωση με την Εκκλησία της Ρώμης, προβάλλοντας το παπικό πρωτείο, το οποίο προβάλλεται με το επιχείρημα, ότι η Ανατολή αναγνώριζε πάντα πριν το Μεγάλο Σχίσμα την υπεροχή του επισκόπου Ρώμης. Ο πάπας Πίος Θ΄ αναφέρεται σε διάφορα παραδείγματα από την Εκκλησιαστική Ιστορία για να τεκμηριώσει την άποψή του.The Encyclical Letter of the Eastern Patriarchs is an Encyclical in which the Eastern Patriarchs respond to an earlier letter of Pope Pius IX to them (Litterae ad Orientale. In Suprema Petri Apostoli Sede). Encouraged by the successes of the Vatican in foreign policy in January 1848, Pope Pius decided to turn to the Eastern Orthodox Christians and ask them to return in communion with the Church of Rome, promoting the papal primacy, which is argued that the East always recognized the supremacy of the bishop of Rome before the Great Schism. Pope Pius IX refers to various examples from Ecclesiastical History to substantiate his view

Adhesion of osteoblasts to a nanorough titanium implant surface

This work considers the adhesion of cells to a nanorough titanium implant surface with sharp edges. The basic assumption was that the attraction between the negatively charged titanium surface and a negatively charged osteoblast is mediated by charged proteins with a distinctive quadrupolar internal charge distribution. Similarly, cation-mediated attraction between fibronectin molecules and the titanium surface is expected to be more efficient for a high surface charge density, resulting in facilitated integrin mediated osteoblast adhesion. We suggest that osteoblasts are most strongly bound along the sharp convex edges or spikes of nanorough titanium surfaces where the magnitude of the negative surface charge density is the highest. It is therefore plausible that nanorough regions of titanium surfaces with sharp edges and spikes promote the adhesion of osteoblasts