cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
$In$ $situ$ and $operando$ characterisation techniques for solid oxide electrochemical cells: Recent advances
Creators: name: Stangl, Alexander
name: Muñoz-Rojas, David
name: Burriel, Mónica
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Oxygen activity and surface stability are two key parameters in the search for advanced materials for intermediate temperature solid oxide electrochemical cells, as overall device performance depends critically on them. In particular $in$ $situ$ and $operando$ characterisation techniques have accelerated the understanding of degradation processes and the identification of active sites, motivating the design and synthesis of improved, nanoengineered materials. In this short topical review we report on the latest developments of various sophisticated $in$ $situ$ and $operando$ characterization techniques, including Transmission and Scanning Electron Microscopy (TEM and SEM), surface-enhanced Raman spectroscopy (SERS), Electrochemical Impedance Spectroscopy (EIS), X-ray Diffraction (XRD) and synchrotron based X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS), among others. We focus on their use in three emerging topics, namely: (i) the analysis of general electrochemical reactions and the surface defect chemistry of electrode materials; (ii) the evolution of electrode surfaces achieved by nanoparticle exsolution for enhanced oxygen activity and (iii) the study of surface degradation caused by Sr segregation, leading to reduced durability. For each of these topics we highlight the most remarkable examples recently published. We anticipate that ongoing improvements in the characterisation techniques and especially a complementary use of them by multimodal approaches will lead to improved knowledge of $operando$ processes, hence allowing a significant advancement in cell performance in the near future.
Exciton vortices in two-dimensional hybrid perovskite monolayers
Creators: name: Chen, Yingda
name: Zhang, Dong
name: Chang, Kai
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study theoretically the exciton Bose-Einstein condensation and exciton vortices in a two-dimensional (2D) perovskite (PEA)2PbI4 monolayer. Combining the first-principles calculations and the Keldysh model, the exciton binding energy of (PEA)2PbI4 in a monolayer can approach hundreds meV, which make it possible to observe the excitonic effect at room temperature. Due to the large exciton binding energy, and hence the high density of excitons, we find that the critical temperature of the exciton condensation could approach the liquid nitrogen regime. In presence of perpendicular electric fields, the dipole-dipole interaction between excitons is found to drive the condensed excitons into patterned vortices, as the evolution time of vortex patterns is comparable to the exciton lifetime.
Editorial
Creators: name: Figueiredo, Miguel
name: Sequeira, Ana
Publisher: name: Medi@ções
Year: 2023

description: A cooperação para a Educação é um desafio que se coloca a diversas entidades, individuais ou coletivas, no sentido de implementar ações que promovam estratégias educativas para melhorar planos nacionais de educação em países onde a Educação ainda não se encontra disseminada com a qualidade desejada.
É neste contexto que a Revista Medi@ções Online decidiu apresentar um número temático dedicado à Cooperação Internacional em Educação e Formação, com foco em experiências concretizadas ou em curso em países africanos de língua oficial portuguesa ou em Timor Loro Sa`e. Foram convidados e desafiados autores a partilharem os seus contributos através de artigos de natureza diversa espelhando diferentes dinâmicas que potenciem a cooperação internacional no cruzamento da educação e formação de diversos atores educativos.
description: Medi@ções, Vol. 11 N.º 2 (2023): Cooperação Internacional em Educação e Formação
Εκκλησιαστική πίστη και διαφωτισμός:
Creators: name: Κατσαρού, Κωνσταντίνα Ευθυμίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Διαφωτισμός
Αγιος Αθανάσιος Πάριος
Αδαμάντιος Κοραής
Enlightnement
Saint Athanasios Parios
Adamantios Korais

description: Η παρούσα μεταπτυχιακή εργασία χωρίζεται σε πέντε κεφάλαια. Στο πρώτο κεφάλαιο γίνεται αναφορά στο ιστορικό πλαίσιο του Ευρωπαϊκού και Νεοελληνικού Διαφωτισμού, ενώ στο δεύτερο εξετάζεται η φιλοσοφία την εποχή του Διαφωτισμού. Αφετηρία και βάση της φιλοσοφικής σκέψης του 18ου αιώνα γίνεται ο αυτόνομος και ελεύθερος άνθρωπος. Κατ’ επέκταση, η θρησκεία έπρεπε να τοποθετηθεί μέσα σε ορθολογιστικά πλαίσια. Επιπλέον, η νεοελληνική εθνική συνείδηση και η εκπαίδευση διαμορφώθηκαν με βάση τα αιτήματα του Διαφωτισμού. Το τρίτο κεφάλαιο περιλαμβάνει τις απόψεις Ευρωπαίων και Ελλήνων Διαφωτιστών για τη θρησκεία. Κύριος στόχος των Ευρωπαίων Διαφωτιστών ήταν η οικοδόμηση μιας νέας πίστης με επίκεντρο τον άνθρωπο και το λογικό του. Από την άλλη μεριά, οι Έλληνες Διαφωτιστές έδειχναν αρνητική στάση απέναντι στην αθεία και εργάστηκαν περισσότερο για την αναμόρφωση του κλήρου. Στο τέταρτο κεφάλαιο, καταγράφονται οι αντιλήψεις των Ελλήνων Διαφωτιστών για το χριστιανισμό και κυρίως οι απόψεις του Αδαμάντιου Κοραή. Τέλος, στο πέμπτο κεφάλαιο γίνεται αναφορά στη στάση της Ορθόδοξης Εκκλησίας έναντι του Διαφωτισμού. Ο Άγ. Αθανάσιος ο Πάριος βλέποντας ότι η νέα φιλοσοφία ήταν καταστρεπτική για τη σωτηρία του ανθρώπου, αντιστάθηκε σθεναρά στην εισαγωγή των νέων ιδεών στον ελληνικό χώρο.
description: The present Dissertation is divided into five chapters. The first chapter refers to the historical frame of the European and Modern Greek Enlightenment, while the philosophy the season of Enlightenment is examined in the second chapter. The starting line of the philosophical thought of the 18th century is the autonomous and free person. Thus, the religion should have been placed in rational frames. The modern Greek national conscience and the education were shaped, having as a base the demands of the Enlightenment. The third chapter points out the opinions of the European and Greek philosophers of the Enlightenment regarding the religion. The main aim of the European philosophers was the construction of a new faith with epicentre the person and his rational thought. From the other side, the Greeks philosophers were having negative attitude toward atheism and worked more for the reformation. In the fourth chapter are recorded the perceptions of the Greek philosophers of the period for the Christianity and mainly the opinions of Adamantios Korais. Finally, the fifth chapter refers to the attitude of Orthodox Church against the Enlightenment. Saint Athanasios Parios seeing that the new philosophy was dangerous for the salvation of person resisted vigorously in the import of new ideas in the Greek nation.
Hot Halos around High Redshift Protogalaxies: Observations of O VI and N V Absorption in Damped Lyman Alpha systems
Creators: name: Fox, Andrew J.
name: Petitjean, Patrick
name: Ledoux, Cedric
name: Srianand, Raghunathan
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: (ABRIDGED) We present a study of the highly ionized gas (plasma) associated with damped Lyman-alpha (DLA) systems at z=2.1-3.1. We search for O VI absorption and corresponding Si IV, C IV, and N V in a Very Large Telescope/Ultraviolet-Visible Echelle Spectrograph (VLT/UVES) sample of 35 DLA systems with data covering O VI at S/N>10. We report twelve DLAs (nine intervening and three at <5000 km/s from the QSO redshift) with detections of O VI absorption. There are no clear O VI non-detections, so the incidence of O VI in DLAs is between 34% (12/35) and 100%. Analysis of the line widths together with photoionization modelling suggests that two phases of DLA plasma exist: a hot, collisionally ionized phase (seen in broad O VI components), and a warm, photoionized phase (seen just in narrow C IV and Si IV components). We find tentative evidence (98% confidence) for correlations between the DLA metallicity (measured in the neutral gas) and high-ion column density, and between the DLA metallicity and high-ion line width, as would be expected if supernova-driven galactic outflows rather than accretion produced the high ions. Using conservative ionization corrections, we find lower limits to the total hydrogen column densities in the hot (O VI-bearing) and warm (C IV-bearing) phases in the range log N(Hot H II) >19.5 to >21.1, and log N(Warm H II) >19.4 to >20.9. On average, the hot and warm phases thus contain >40% and >20% of the baryonic mass of the neutral phase in DLAs, respectively. If the temperature in the O VI phase is ~10^6 K and so f(O VI)=O VI/O<<0.2 the plasma can make a significant contribution to the metal budget at high redshift.
description: 18 pages, 7 figures (3 in color), accepted to A&A
Dinâmicas e processos de (trans)formação de adultos, práticas artísticas e inclusão.
Creators: name: Oliveira Pires, Ana Luísa
name: Lemos, Gina
name: Vasconcelos, Antonio
Publisher: name: Medi@ções
Year: 2023

description: O artigo foca-se na análise de um projeto de intervenção/formação com pessoas em situação de vulnerabilidade social – o projeto Recriar-se-, desenvolvido pela Cáritas Diocesana de Setúbal. Pretende-se partilhar linhas de reflexão decorrentes do trabalho de investigação realizado por uma equipa de docentes/investigadores, tomando o Recriar-se como objecto de estudo e de avaliação. A investigação em curso procura identificar os contributos do projeto a partir de três dimensões estruturantes - educação não-formal, práticas artísticas e inclusão social, desocultando processos de desenvolvimento pessoal e coletivo dos seus participantes, com vista à mudança e transformação individual, social e comunitária.

Neste artigo apresentam-se e analisam-se as características dos processos e dinâmicas de (trans)formação dos participantes do projeto, decorrentes das práticas de educação não-formal e artísticas.
description: Medi@ções, Vol. 11 N.º 2 (2023): Cooperação Internacional em Educação e Formação
Transfer of acquired rule to conditional reasoning as a function of content similarity, attribute dimension size, and acquisition mode
Creators: name: Vavrik, John
Publisher: name: University of British Columbia
Year: 2009

description: In this study, deductive reasoning with conditional statements of the form IF x THEN y was investigated in a transfer of training paradigm. Subjects induced conditional rules under different training conditions and then solved a series of deductive syllogisms based on conditional rules the content of which was either related (near-transfer) or unrelated (far-transfer) to that of the previously induced rules. The conditions under which the conditional rules were induced varied in terms of the acquisition mode (prediction/diagnosis) and in terms of the size of the attribute dimensions from which rule instances were drawn (binary/trinary). The deductive reasoning task, as the criterion task for transfer, included all four types of conditional syllogisms (Modus Ponens, MP; Denying the Antecedent, DA, Affirming the Consequent, AC, and Modus Tollens, MT). The accuracy of deductive performance on near-transfer was significantly higher than response accuracy on far-transfer on the DA & AC but not on the MP & MT argument forms. Transfer of conditional rule knowledge induced in a predictive mode was significantly better compared to a diagnostic mode on the AC form. Overall, near as well as far-transfer performance was similar for the binary and trinary conditions. In addition, neither the binary nor the trinary condition resulted in improved far-transfer performance compared to controls. The results provide evidence against purely instance-based as well as purely rule-based models of deductive reasoning. Instead, they suggest that conditional knowledge is represented at an intermediate level of abstraction, and that conditional reasoning is adaptive to the form of the deductive argument. Different types of deductive argument types may trigger different reasoning strategies.
title: Ð¥Ð°Ð¹Ð¿-ÑÐ¸ÐºÐ» ÐÐ°ÑÑÐ½ÐµÑÐ° Ð¸ ÑÐ°Ð·Ð²Ð¸ÑÐ¸Ðµ ÑÐ¾Ð²ÑÐµÐ¼ÐµÐ½Ð½ÑÑ ÑÐµÑ Ð½Ð¾Ð»Ð¾Ð³Ð¸Ð¹
title: Hype cycle Gartner and development of modern technologies
Creators: name: ÐÐ°ÑÐºÐ¾, ÐÐ³Ð¾ÑÑ
name: ÐÐ¼Ð¸Ð½ÑÐºÐ¾, ÐÐ°Ð´ÐµÐ¶Ð´Ð°
name: ÐÐ°ÑÐºÐ¾, Ð¡Ð²ÐµÑÐ»Ð°Ð½Ð°
name: "Ð¡Ð¸ÑÑÐµÐ¼Ð½ÑÐ¹ Ð°Ð½Ð°Ð»Ð¸Ð· Ð² Ð¿ÑÐ¾ÐµÐºÑÐ¸ÑÐ¾Ð²Ð°Ð½Ð¸Ð¸ Ð¸ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ð¸", Ð¼ÐµÐ¶Ð´ÑÐ½Ð°ÑÐ¾Ð´Ð½Ð°Ñ Ð½Ð°ÑÑÐ½Ð¾-Ð¿ÑÐ°ÐºÑÐ¸ÑÐµÑÐºÐ°Ñ ÐºÐ¾Ð½ÑÐµÑÐµÐ½ÑÐ¸Ñ (27; 2023; Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³)
Publisher: name: ÐÐÐÐÐ¢ÐÐ¥-ÐÐ ÐÐ¡Ð¡
Year: 2024
Subjects: ÐÐ½ÑÐ¾ÑÐ¼Ð°ÑÐ¸Ð¾Ð½Ð½ÑÐµ ÑÐµÑ Ð½Ð¾Ð»Ð¾Ð³Ð¸Ð¸
ÐÑÐºÑÑÑÑÐ²ÐµÐ½Ð½ÑÐ¹ Ð¸Ð½ÑÐµÐ»Ð»ÐµÐºÑ
Ð¼ÐµÐ³Ð°ÑÑÐµÐ½Ð´Ñ
Ñ Ð°Ð¹Ð¿-ÑÐ¸ÐºÐ»
ÑÑÐ¸Ð³Ð³ÐµÑ
ÐºÐ¾Ð³Ð½Ð¸ÑÐ¸Ð²Ð½Ð°Ñ ÐºÐ°ÑÑÐ°
Ð°Ð½Ð°Ð»Ð¸ÑÐ¸ÑÐµÑÐºÐ°Ñ ÐºÑÐ»ÑÑÑÑÐ°
megatrends
hype cycle
trigger
cognitive map
analytical culture

description: Ð ÑÑÐ°ÑÑÐµ ÑÐ°ÑÑÐ¼Ð¾ÑÑÐµÐ½Ñ ÑÐµÐ½Ð´ÐµÐ½ÑÐ¸Ð¸ ÑÐ°Ð·Ð²Ð¸ÑÐ¸Ñ Ð¾Ð±ÑÐµÑÑÐ²Ð° Ð¿Ð¾ÑÐ»ÐµÐ´Ð½Ð¸Ñ Ð´ÐµÑÑÑÐ¸Ð»ÐµÑÐ¸Ð¹ â Ð¾Ñ Ð¼ÐµÐ³Ð°ÑÑÐµÐ½Ð´Ð¾Ð² ÐÐ¶. ÐÐµÐ¹ÑÐ±Ð¸ÑÐ°, Ð´Ð¾ ÑÐ°Ð¹Ð¿-ÑÐ¸ÐºÐ»Ð° ÐÐ°ÑÑÐ½ÐµÑÐ°. ÐÑÐµÐ´Ð»Ð°Ð³Ð°ÐµÑÑÑ ÐºÐ¾Ð³Ð½Ð¸ÑÐ¸Ð²Ð½Ð¾Ðµ Ð¿ÑÐµÐ´ÑÑÐ°Ð²Ð»ÐµÐ½Ð¸Ðµ Â«Ð¿ÑÐ¾Ð±Ð»ÐµÐ¼ Ð¸ÑÐ¿Ð¾Ð»ÑÐ·Ð¾Ð²Ð°Ð½Ð¸Ñ ITÂ».
description: The article examines the trends in the development of societyâs latest trends â from J. Naisbitâs megatrends to Gartnerâs hype cycle. The cognitive proposition âproblem to use ITâ is proposed.
title: Klimacheck: Wahlprogramme Bundestagswahl 2025
title: Politikoption: Wirksame CO2-Preise in Verbindung mit der vollständigen Pro-Kopf-Ausschüttung der Einnahmen
titleType: Subtitle
Creators: name: Wolfsteiner, Andreas
Publisher: name: Zenodo
Year: 2024

description: Was sagen die Wahlprogramme zu den Themen "CO2-Bepreisung" und "Einnahmeverwendung"?

Wie sind diesee Aussagen einzuordnen vor der Politikoption "wirksame CO2-Preise mit einer Pro-Kopf-Ausschüttung der gesamten Einnahmen"?

Mit dieser Politikoption könnten wir unsere CO2-Ziele sicher und kosteneffizient einhalten. Wobei eine breite Akzeptanz bei den Bürger erreichbar sein könnte.
Cooperação Internacional e Formação de Professores: relatos de uma experiência num Colégio no Lubango
Creators: name: Almeida, Ana
name: Boléo, Ana
name: Machado, Ricardo
Publisher: name: Medi@ções
Year: 2023

description: A cooperação internacional tem assumido, nos últimos anos, um protagonismo e importância em diferentes setores, sobretudo no que toca à formação e qualificação de recursos humanos. No contexto da educação e da formação de professores, em particular, o desenvolvimento de projetos de cooperação no contexto dos Países Africanos de Língua Oficial Portuguesa (PALOP) tem constituído um desafio ético, pedagógico, cultural e científico para várias organizações com fins educativos, nomeadamente, Instituições de Ensino Superior (IES).


O artigo que aqui se apresenta procura dar conta de uma experiência de cooperação internacional entre uma IES privada portuguesa e um Colégio Privado no Lubango, Província de Huíla, para a formação de professores.


Ao longo do artigo procuraremos descrever esta experiência, bem como partilhar as perceções dos formandos no final da formação.
description: Medi@ções, Vol. 11 N.º 2 (2023): Cooperação Internacional em Educação e Formação
Ανάπτυξη ενός συστήματος τεστ αυτοαξιολόγησης σε δικτυακό τόπο:
Creators: name: Τζέλη, Δέσποινα Αντωνίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Προσαρμοστικότητα
Αυτοαξιολόγηση
Προσαρμοστικά τεστ
Adaptivity
Self-assessment
Computerized adaptive testing

description: Η αυτο-αξιολόγηση των μαθητών είναι ένα πολύ σημαντικό θέμα στον εκπαιδευτικό τομέα. Ο στόχος αυτής της εργασίας είναι να εξεταστεί το θεωρητικό υπόβαθρο της προσαρμοστικής αυτοαξιολόγησης, να αναπτυχθεί ένα μοντέλο προσαρμοστικού συστήματος και να υλοποιηθεί ένα διαδικτυακό εργαλείο για να βοηθήσει τους εκπαιδευτικούς και τους εκπαιδευόμενους στη διαδικασία της αυτο-αξιολόγησης. Το σύστημα στηρίζεται στις θεωρίες της αυτοαξιολόγησης, της προσαρμοστικότητας, του Computer Adaptive Testing και της Item Response Theory. Με το σύστημα αυτό οι εκπαιδευτικοί σε όλο τον κόσμο θα μπορούν να καθορίζουν τα τεστ-αυτοαξιολόγησης, και οι μαθητές τους θα μπορούν να κάνουν αυτά τα τεστ on-line. Με τη χρήση των ηλεκτρονικών υπολογιστών, μεγαλύτερος αριθμός ερωτήσεων μπορούν να αποθηκευτούν στη βάση, οι αλγόριθμοι επιλογής αντικειμένου μπορούν να διεξαχθούν πιο αποτελεσματικά και οι ερωτήσεις μπορούν να περιλαμβάνουν πολυμεσικό περιεχόμενο. Τα τεστ στο σύστημα παράγονται σύμφωνα με τις προδιαγραφές των εκπαιδευτικών και είναι προσαρμοστικά, δηλαδή, οι ερωτήσεις επιλέγονται έξυπνα ώστε να προσαρμόζονται στο επίπεδο της γνώσης του μαθητή. Με τον τρόπο αυτό, δίνονται ακριβείς εκτιμήσεις για τις γνώσεις των μαθητών, με σημαντικά μικρότερο αριθμών τεστ και η αυτοαξιολόγηση γίνεται με περισσότερη ακρίβεια, δίνοντας στο μαθητή το κατάλληλο feedback που θα ανταποκρίνεται ακριβώς στις γνώσεις του, και θα τον καθοδηγεί στο διάβασμα του.
description: Student self-assessment is a very important issue in educational system. The goal of this project is to examine the theoretical basis of adaptive self-assessment, develop a model of adaptive system and a web-based tool to assist teachers and learners in the process of self-assessment. The system is based on theories of self-assessment, of the adaptivity, of Computer Adaptive Testing and of Item Response Theory. With this system, teachers around the world will be able to determine the self-assessment tests, and students will be able to do these tests on-line. By using the computer, larger number of questions can be stored at the base, the object selection algorithms can be performed more efficiently and questions can include multimedia content. The test system produced in accordance with the standards of education and are adaptive, that means that the questions are chosen intelligently to fit the level of knowledge of the student. Thus, the estimations of students' knowledge are more accurate, with much smaller numbers of tests, and the self-assessment procedure is more reliable and valid, giving the student an appropriate feedback which will correspond exactly to his knowledge’s level and guides him to study more correctly.
Democratizar a (educação em) ciência, em contexto de cooperação internacional: o caso da Cartas com Ciência
Creators: name: RP Alves, Mariana
name: Galupa, Rafael
Publisher: name: Medi@ções
Year: 2023

description: Iniciativas de educação não formal criam mais oportunidades para aproximar jovens da ciência. Contudo, nem todas as pessoas jovens têm acesso às mesmas oportunidades. Neste artigo apresenta-se o trabalho da [Cartas com Ciência], que visa combater desigualdades sociais através da ciência em contexto de cooperação internacional com oito países de língua oficial portuguesa. Para a maioria das 560 pessoas jovens que participaram nos programas, foi a primeira vez que "conheceram" uma pessoa a trabalhar em ciência.
description: Medi@ções, Vol. 11 N.º 2 (2023): Cooperação Internacional em Educação e Formação
Posttranscriptional regulation of ICAM-1 gene expression
Creators: name: Ohh, Michael
Publisher: name: University of British Columbia
Year: 2009

description: Cell-cell adhesion is critical for the generation of effective immune responses and is dependent upon the expression of a variety of cell surface receptors. Intercellular adhesion molecule-1 (ICAM- 1; CD54) is an inducible cell surface glycoprotein expressed at a low level on a wide range of cell types. Although its expression is dramatically increased at sites of inflammation, providing important means of regulating cell-cell interactions and thereby inflammatory responses, the intracellular regulatory elements and signaling pathways underlying the inducible expression of ICAM- 1 by proinflammatory cytokines were previously largely unknown. In this thesis, a novel posttranscriptional regulation of ICAM-1 gene expression by two proinflammatory mediators, interferon-γ (IFN-γ) and phorbol myristate acetate (PMA), and the possible role of serine/threonine (ser/thr) phosphorylation pathway in cycloheximide induced ICAM-1 message stabilization were investigated. The results show that (1) constitutively expressed ICAM-1 mRNA has a short half-life; (2) IFN-γ and PMA induce the accumulation of ICAM-1 message, at least in part, by stabilizing the mRNA; (3) the WN-γ responsive element(s) is located within the protein coding region encoding the cytoplasmic domain; (4) the PMA-responsive elements lie within the 3’ untranslated region (UTR) and may even be the AUUUA multimers; (5) cycloheximide, a potent eukaryotic protein synthesis inhibitor that superinduces the expression of many genes by preventing the degradation of otherwise labile mRNAs, also induces the level of ICAM- 1 mRNA by message stabilization; (6) the stabilizing effect of cycloheximide does not depend on the 3’UTR containing the AUUUA sequences; (7) the stabilization of ICAM-1 mRNA by cycloheximide is independent of its translational inhibition; and (8) the ser/thr phosphorylation pathway seems to play a crucial role in the cycloheximide-induced stabilization of ICAM- 1 message. These results demonstrate the existence of distinct destabilizing elements throughout the ICAM- 1 message that are responsive to the actions of various proinflammatory cytokines, and underscore the importance of posttranscriptional regulation of ICAM-1 expression during an inflammatory response.
Participação política online e competências digitais: um estudo de caso com jovens universitários
Creators: name: Matos, Tatiana
name: Kubrusly, Ana
name: Batista, Susana
Publisher: name: Medi@ções
Year: 2023

description: Este artigo aborda as oportunidades e desafios da participação política online de jovens universitários, tendo em conta as suas competências digitais. Os dados, recolhidos através de questionário e dois focus-group, evidenciam uma participação sobretudo latente, assente no consumo de conteúdo, ainda que a capacidade de verificar a veracidade das informações encontradas seja um dos itens menos dominados. A partilha ou a publicação, reconhecidas como ações mais poderosas, e associadas a competências criativas, implicam riscos, que acabam por inibir a participação.


 
description: Medi@ções, Vol. 11 N.º 2 (2023): Cooperação Internacional em Educação e Formação
Random lasing in weakly scattering systems
Creators: name: Wu, X.
name: Fang, W.
name: Yamilov, A.
name: Chabanov, A. A.
name: Asatryan, A. A.
name: Botten, L. C.
name: Cao, H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present detailed experimental and numerical studies of random lasing in weakly scattering systems. The interference of scattered light, which is weak in the passive systems, is greatly enhanced in the presence of high gain, providing coherent and resonant feedback for lasing. The lasing modes are confined in the vicinity of the pumped volume due to absorption of emitted light outside it. In the ballistic regime where the size of gain volume is less than the scattering mean free path, lasing oscillation occurs along the direction in which the gain volume is most extended, producing directional laser output. The feedback for lasing originates mainly from backscattering of particles near the boundaries of pumped region. It results in nearly constant frequency spacing of lasing modes, which scales inversely with the maximum dimension of the gain volume.
description: 30 pages, 10 figures
Error analysis in cross-correlation of sky maps: application to the ISW detection
Creators: name: Cabre, Anna
name: Fosalba, Pablo
name: Gaztanaga, Enrique
name: Manera, Marc
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Constraining cosmological parameters from measurements of the Integrated Sachs-Wolfe effect requires developing robust and accurate methods for computing statistical errors in the cross-correlation between maps. This paper presents a detailed comparison of such error estimation applied to the case of cross-correlation of Cosmic Microwave Background (CMB) and large-scale structure data. We compare theoretical models for error estimation with montecarlo simulations where both the galaxy and the CMB maps vary around a fiducial auto-correlation and cross-correlation model which agrees well with the current concordance LCDM cosmology. Our analysis compares estimators both in harmonic and configuration (or real) space, quantifies the accuracy of the error analysis and discuss the impact of partial sky survey area and the choice of input fiducial model on dark-energy constraints. We show that purely analytic approaches yield accurate errors even in surveys that cover only 10% of the sky and that parameter constraints strongly depend on the fiducial model employed. Alternatively, we discuss the advantages and limitations of error estimators that can be directly applied to data. In particular, we show that errors and covariances from the Jack-Knife method agree well with the theoretical approaches and simulations. We also introduce a novel method in real space that is computationally efficient and can be applied to real data and realistic survey geometries. Finally, we present a number of new findings and prescriptions that can be useful for analysis of real data and forecasts, and present a critical summary of the analyses done to date.
description: submitted to MNRAS, 26 pages
H$α$ fluxes and extinction distances for planetary nebulae in the IPHAS survey of the Northern Galactic Plane
Creators: name: Dharmawardena, Thavisha E.
name: Barlow, M. J.
name: Drew, J. E.
name: Seales, A.
name: Sale, S. E.
name: Jones, D.
name: Mampaso, A.
name: Parker, Q. A.
name: Sabin, L.
name: Wesson, R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We report H$α$ filter photometry for 197 northern hemisphere planetary nebulae (PNe) obtained using imaging data from the IPHAS survey. H$α$+[N II] fluxes were measured for 46 confirmed or possible PNe discovered by the IPHAS survey and for 151 previously catalogued PNe that fell within the area of the northern Galactic Plane surveyed by IPHAS. After correcting for [N II] emission admitted by the IPHAS H$α$ filter, the resulting H$α$ fluxes were combined with published radio free-free fluxes and H$β$ fluxes, in order to estimate mean optical extinctions to 143 PNe using ratios involving their integrated Balmer line fluxes and their extinction-free radio fluxes. Distances to the PNe were then estimated using three different 3D interstellar dust extinction mapping methods, including the IPHAS-based H-MEAD algorithm of Sale (2014). These methods were used to plot dust extinction versus distance relationships for the lines of sight to the PNe; the intercepts with the derived dust optical extinctions allowed distances to the PNe to be inferred. For 17 of the PNe in our sample reliable Gaia DR2 distances were available and these have been compared with the distances derived using three different extinction mapping algorithms as well as with distances from the nebular radius vs. H$α$ surface brightness relation of Frew et al. (2016). That relation and the H-MEAD extinction mapping algorithm yielded the closest agreement with the Gaia DR2 distances.
description: Accepted by MNRAS, 13 pages, 3 figures. Author accepted manuscript. Accepted on 04/12/2020. Deposited on 04/12/2020
title: Klimacheck: Wahlprogramme Bundestagswahl 2025
title: Politikoption: Wirksame CO2-Preise in Verbindung mit der vollständigen Pro-Kopf-Ausschüttung der Einnahmen
titleType: Subtitle
Creators: name: Wolfsteiner, Andreas
Publisher: name: Zenodo
Year: 2024
Subjects: Wahlprogramme
BTW25
Bundestagswahl
Bundestagswahl 2025
CO2-Preis
Klimageld
Klimadividende
Emissionshandel

description: Was sagen die Wahlprogramme zu den Themen "CO2-Bepreisung" und "Einnahmeverwendung"?

Wie sind diesee Aussagen einzuordnen vor der Politikoption "wirksame CO2-Preise mit einer Pro-Kopf-Ausschüttung der gesamten Einnahmen"?

Mit dieser Politikoption könnten wir unsere CO2-Ziele sicher und kosteneffizient einhalten. Wobei eine breite Akzeptanz bei den Bürger erreichbar sein könnte.
Cooperação em educação e formação entre Angola e Portugal: Um olhar narrativo do projeto RETFOP
Creators: name: Barbante, Cesário José Sanjambo
name: Teixeira, Manuel
name: Sampaio, Fábio
name: Robalo, Ana
Publisher: name: Medi@ções
Year: 2023

description: As ligações históricas e culturais, bem como a partilha do mesmo idioma, reforçam as relações de amizade e de cooperação entre Angola e Portugal. O presente estudo tem como objetivo apresentar o panorama de um projeto-parceria de educação e/ou formação de quadros técnicos de Angola. Neste sentido, elaborou-se a seguinte pergunta de investigação: Quais os desafios identificados no projeto RETFOP? Trata-se de uma pesquisa de tipo descritiva, tendo uma abordagem qualitativa. Optou-se pelas técnicas da análise documental e observação participante. Considerando o marco teórico-conceptual sobre o projeto em questão, os resultados da análise revelam a prossecução do projeto RETFOP, tendo-se, no entanto, verificado o empenho das entidades e/ ou instituições envolvidas. Por outro lado, há, ainda,  desafios por se resolver, nomeadamente: a gestão participativa e inclusiva, e o não desperdício das oportunidades; ou seja, deve-se tirar maior proveito possível desta cooperação, essencialmente para Angola, que muito precisa de recursos humanos qualificados para o seu desenvolvimento
description: Medi@ções, Vol. 11 N.º 2 (2023): Cooperação Internacional em Educação e Formação
Magnetoacoustic Resonance to Probe Quadrupole-Strain Coupling in a Diamond Nitrogen-Vacancy Center as a Spin-Triplet System
Creators: name: Koga, Mikito
name: Matsumoto, Masashige
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A theory of magnetoacoustic resonance is proposed to measure quadrupole-strain couplings in a spin-triplet state with the $C_{3v}$ point group symmetry, considering the spin-strain interaction in a diamond nitrogen-vacancy (NV) center. Based on the Floquet theory, we demonstrate how the single- and two-phonon transition probabilities depend on the change in the longitudinal and transverse quadrupole couplings, which can be controlled by rotating an applied magnetic field, around the threefold axis. The obtained quadrupole dynamics results are useful for realizing mechanical or ac strain-control of the NV spin as an alternative to the conventional magnetic control by spin resonance.
description: 13 pages, 5 figures
Collapse in boson-fermion mixtures with all-repulsive interactions
Creators: name: Prytula, Vladyslav I.
name: Konotop, Vladimir V.
name: Perez-Garcia, Victor M.
name: Vekslerchik, Vadym E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: We describe the collapse of the bosonic component in a boson-fermion mixture due to the pressure exerted on them by a large fermionic component, leading to collapse in a system with all-repulsive interactions. We describe the phenomena early collapse and of super-slow collapse of the mixture.
description: 5 pages
Διάδοση και χρήση των αγγείων Κερτς στη Μεσόγειο και τη Μαύρη Θάλασσα.:
Creators: name: Γαρούφα, Στυλιανή Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Μαύρη Θάλασσα
Αγγεία Κερτς
Ερυθρόμορφη Κεραμική
Black Sea
Kerch vases
Red figured pottery

description: Τα αγγεία Κερτς αποτελούν την τελευταία φάση της ερυθρόμορφης τεχνικής ζωγραφικής αγγείων. Κατά τη διάρκεια της παραγωγής τους, διαδόθηκαν σε σημαντικές εμπορικές θέσεις της λεκάνης της Μεσογείου αλλά και της Μαύρης Θάλασσας, κυρίως ως αντικείμενα πολυτελείας. Παράλληλα με τη διάδοσή τους όμως, ενδιαφέρον παρουσιάζει η μελέτη του θέματος της χρήσης τους καθώς, σύμφωνα με τα ευρήματα, φαίνεται ότι διαφοροποιείται ανάλογα με τις περιοχές εξαγωγής.
description: The Kerch vases constitute the latest phase of the red pottery painting technique. During their production, they spread to major commercial sites around the Mediterranean and the Black Sea area, primarily as luxury goods. However, along with their diffusion, it is interesting to study the issue of their use, as according to the findings, the uses appear to vary depending on the areas of export.
A fast and robust approach to long-distance quantum communication with atomic ensembles
Creators: name: Jiang, L.
name: Taylor, J. M.
name: Lukin, M. D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum repeaters create long-distance entanglement between quantum systems while overcoming difficulties such as the attenuation of single photons in a fiber. Recently, an implementation of a repeater protocol based on single qubits in atomic ensembles and linear optics has been proposed [Nature 414, 413 (2001)]. Motivated by rapid experimental progress towards implementing that protocol, here we develop a more efficient scheme compatible with active purification of arbitrary errors. Using similar resources as the earlier protocol, our approach intrinsically purifies leakage out of the logical subspace and all errors within the logical subspace, leading to greatly improved performance in the presence of experimental inefficiencies. Our analysis indicates that our scheme could generate approximately one pair per 3 minutes over 1280 km distance with fidelity (F>78%) sufficient to violate Bell's inequality.
description: 10 pages, 4 figures, 5 tables (Two appendixes are added to justify two claims used in the maintext.)
title: Klimacheck: Wahlprogramme Bundestagswahl 2025
title: Politikoption: Wirksame CO2-Preise in Verbindung mit der vollständigen Pro-Kopf-Ausschüttung der Einnahmen
titleType: Subtitle
Creators: name: Wolfsteiner, Andreas
Publisher: name: Zenodo
Year: 2025
Subjects: Wahlprogramme
BTW25
Bundestagswahl
Bundestagswahl 2025
CO2-Preis
Klimageld
Klimadividende
Emissionshandel

description: Was sagen die Wahlprogramme zu den Themen "CO2-Bepreisung" und "Einnahmeverwendung"?

Wie sind diesee Aussagen einzuordnen vor der Politikoption "wirksame CO2-Preise mit einer Pro-Kopf-Ausschüttung der gesamten Einnahmen"?

Mit dieser Politikoption könnten wir unsere CO2-Ziele sicher und kosteneffizient einhalten. Wobei eine breite Akzeptanz bei den Bürger erreichbar sein könnte.
title: Klimacheck: Wahlprogramme Bundestagswahl 2025
title: Politikoption: Wirksame CO2-Preise in Verbindung mit der vollständigen Pro-Kopf-Ausschüttung der Einnahmen
titleType: Subtitle
Creators: name: Wolfsteiner, Andreas
Publisher: name: Zenodo
Year: 2025
Subjects: Wahlprogramme
BTW25
Bundestagswahl
Bundestagswahl 2025
CO2-Preis
Klimageld
Klimadividende
Emissionshandel
Klimabonus
EU-ETS 2
ETS2
ETS

description: Was sagen die Wahlprogramme zu den Themen "CO2-Bepreisung" und "Einnahmeverwendung"?

Wie sind diesee Aussagen einzuordnen vor der Politikoption "wirksame CO2-Preise mit einer Pro-Kopf-Ausschüttung der gesamten Einnahmen"?

Mit dieser Politikoption könnten wir unsere CO2-Ziele sicher und kosteneffizient einhalten. Wobei eine breite Akzeptanz bei den Bürger erreichbar sein könnte.
Kappa classes on KSBA spaces
Creators: name: Alexeev, Valery
Publisher: name: arXiv
Year: 2023
Subjects: subject: Algebraic Geometry (math.AG)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 14D23, 14C17, 14L24, 14F43

description: We define kappa classes on moduli spaces of KSBA stable varieties and pairs, generalizing the Miller-Morita-Mumford classes on moduli of curves, and compute them in some cases where the virtual fundamental class is known to exist, including Burniat and Campedelli surfaces. For Campedelli surfaces, an intermediate step is finding the Chow (same as cohomology) ring of the GIT quotient $(\mathbb P^2)^7//SL(3)$.
description: v2: Added references. Comments welcome
Entropic bounds on information backflow
Creators: name: Megier, Nina
name: Smirne, Andrea
name: Vacchini, Bassano
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In the dynamics of open quantum systems, the backflow of information to the reduced system under study has been suggested as the actual physical mechanism inducing memory and thus leading to non-Markovian quantum dynamics. To this aim, the trace-distance or Bures-distance revivals between distinct evolved system states have been shown to be subordinated to the establishment of system-environment correlations or changes in the environmental state. We show that this interpretation can be substantiated also for a class of entropic quantifiers. We exploit a suitably regularized version of Umegaki's quantum relative entropy, known as telescopic relative entropy, that is tightly connected to the quantum Jensen-Shannon divergence. In particular, we derive general upper bounds on the telescopic relative entropy revivals conditioned and determined by the formation of correlations and changes in the environment. We illustrate our findings by means of examples, considering the Jaynes-Cummings model and a two-qubit dynamics.
description: 5+2 pages, 5 figures
Performance of the Cell processor for biomolecular simulations
Creators: name: De Fabritiis, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: The new Cell processor represents a turning point for computing intensive applications. Here, I show that for molecular dynamics it is possible to reach an impressive sustained performance in excess of 30 Gflops with a peak of 45 Gflops for the non-bonded force calculations, over one order of magnitude faster than a single core standard processor.
Clusters of Solar Eclipses in the Maori Era
Creators: name: Khalisi, Emil
Publisher: name: arXiv
Year: 2020
Subjects: subject: History and Philosophy of Physics (physics.hist-ph)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Popular Physics (physics.pop-ph)
subject: FOS: Physical sciences

description: A dozen of high-magnitude solar eclipses accumulated near New Zealand in the 15th century AD when the Maori inhabited the two main islands. Taking today's capital Wellington as the point of reference, we counted ten events with magnitude larger than 0.9 between 1409 and 1516 AD and two more just below this value. The eclipses need not have been all observed on account of weather conditions. An allusion to a particular event that could be conveyed in a myth is discussed, but the dating turns out far from certain. We take the opportunity here to meet the astronomy of the Maori and their understanding of this natural phenomenon. Moreover, an announcement is made to a cluster of five central eclipses of the sun that will encounter New Zealand from 2035 to 2045.
description: 7 pages, 5 figs, 1 tab, 13 refs
A experiência da investigação “O Trabalho de Projeto com robótica educativa no 1.º Ciclo do Ensino Básico”
Creators: name: Ribeiro, Ana Margarida
name: Rodrigues, Maria Do Rosário
Publisher: name: Medi@ções
Year: 2023

description: Este artigo é uma reflexão sobre a experiência da investigação “O Trabalho de Projeto com robótica educativa no 1.º Ciclo do Ensino Básico. Pretende-se descrever e refletir sobre a utilização da robótica em contexto educativo quando utilizada em articulação com a metodologia trabalho de projeto. A robótica permitiu ser o elo de ligação entre a aquisição e desenvolvimento de conhecimentos e a motivação, interesse e predisposição dos alunos, face às tarefas propostas, que se consideram ser desafiantes.
description: Medi@ções, Vol. 11 N.º 2 (2023): Cooperação Internacional em Educação e Formação
title: Klimacheck: Wahlprogramme Bundestagswahl 2025
title: Politikoption: Wirksame CO2-Preise in Verbindung mit der vollständigen Pro-Kopf-Ausschüttung der Einnahmen
titleType: Subtitle
Creators: name: Wolfsteiner, Andreas
Publisher: name: Zenodo
Year: 2025
Subjects: Wahlprogramme
BTW25
Bundestagswahl
Bundestagswahl 2025
CO2-Preis
Klimageld
Klimadividende
Emissionshandel
Klimabonus
EU-ETS 2
ETS2
ETS

description: Was sagen die Wahlprogramme zu den Themen "CO2-Bepreisung" und "Einnahmeverwendung"?

Wie sind dieser Aussagen einzuordnen vor der Politikoption "wirksame CO2-Preise mit einer Pro-Kopf-Ausschüttung der gesamten Einnahmen"?

Mit dieser Politikoption würden wir unsere CO2-Ziele sicher und kosteneffizient einhalten. Wobei eine breite Akzeptanz bei den Bürgern erreichbar sein könnte.
Fano fourfolds with large anticanonical base locus
Creators: name: Höring, Andreas
name: Secci, Saverio Andrea
Publisher: name: arXiv
Year: 2023
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14J45, 14J35, 14E30, 14J17

description: A famous theorem of Shokurov states that a general anticanonical divisor of a smooth Fano threefold is a smooth K3 surface. This is quite surprising since there are several examples where the base locus of the anticanonical system has codimension two. In this paper we show that for four-dimensional Fano manifolds the behaviour is completely opposite: if the base locus is a normal surface, hence has codimension two, all the anticanonical divisors are singular.
description: Final version, 26 pages
Ενεργειακές εισροές-εκροές σε καλλιέργειες συμπύρηνου ροδάκινου:
Creators: name: Μίχος, Μάριος Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Ενεργειακό ισοζύγιο
Οργανική γεωργία
Εκπομπές αερίων θερμοκηπίου
Energy flow
Organic farming
Greenhouse gas emissions

description: Η ενεργειακή ανάλυση σε ροδακινεώνες είναι χρήσιμη προκειμένου να αποφασιστούν οι καλύτερες στρατηγικές διαχείρισης. Ο σκοπός αυτής της εργασίας ήταν να εκτιμηθούν α) το ενεργειακό ισοζύγιο σε συμβατικούς, οργανικούς και οπωρώνες ολοκληρωμένης διαχείρισης και β) η επίδραση του καλλιεργητικού συστήματος στην εκπομπή αερίων του θερμοκηπίου. Δεκαέξι οπωρώνες (4 συμβατικοί, 9 ολοκληρωμένης διαχείρισης, 3 οργανικοί) σε έξι τοποθεσίες στην Ελλάδα επιλέχθηκαν τυχαία κατά τη διάρκεια του έτους 2008-2009. Χρησιμοποιήθηκαν πολυδιάστατες αναλύσεις δεδομένων προκειμένου να εντοπιστούν α) γενικά πρότυπα ομαδοποιήσεων των γεωργικών συστημάτων και β) συσχετιστικές τάσεις μεταξύ των μεταβλητών αναφορικά με τα καλλιεργητικά συστήματα και τους συντελεστές παραγωγής. Προέκυψαν 3 τρεις δέσμες ομοειδών καλλιεργητικών συστημάτων και τρεις ομάδες μεταβλητών. Τα καλλιεργητικά συστήματα της ίδιας ομάδας ανταποκρίνονται παρόμοια στις μεταβλητές των συντελεστών παραγωγής. Μη παραμετρικοί έλεγχοι που αφορούσαν εξωτερικές μεταβλητές (εκροές, αποδοτικότητα ενέργειας, παραγωγή, CO2, CH4, N2O) έδειξαν ότι οι μεταβλητές στην ομαδοποίηση των οργανικών αγροκτημάτων ήταν κατά μέσο όρο στατιστικώς σημαντικά χαμηλότερες. Ομοιότητες και/ή διαφορές μεταξύ καλλιεργητικών συστημάτων πιθανόν να οφείλονται στην τοπογραφία, τους συντελεστές παραγωγής και τοπικές καλλιεργητικές πρακτικές. Τα αποτελέσματα έδειξαν ότι η οργανική γεωργία μπορεί να μειώσει τις εισροές και τις εκπομπές αερίων θερμοκηπίου.
description: Energy analysis in peach farms is useful to deciding best management strategies. The objective of this study was to evaluate a) the energy flow among conventionally, integrated and organically farming systems and b) the effect of farming system to greenhouse gas-emissions. Sixteen farms (4 conventional, 9 integrated, 3 organic) at 6 locations in Greece were selected randomly during 2008–2009. Multidimensional data analyses were used to detect a) clusters of farming systems and b) associations between farming systems and production coefficients variables. Three clusters of farming systems and 3 groups of variables were revealed. Farming systems in the same group respond more or less similarly to the production coefficients variables. Non-parametric tests concerning external variables (outputs, energy efficiency, fruit production, CO2, CH4, N2O) showed that the variables in organic farming cluster were at average statistically significantly lower. Similarities and/or dissimilarities among farming systems, which can probably be related to farm topography, production coefficients and local farming practices. The results showed that organic farming could reduce inputs and gas-emissions.
Negative heat capacity for hot nuclei using formulation from the microcanonical ensemble INDRA Collaboration
Creators: name: Borderie, B.
name: Piantelli, S.
name: Bonnet, E.
name: Bougault, R.
name: Chbihi, A.
name: Ducret, J. E.
name: Frankland, J. D.
name: Galichet, E.
name: Gruyer, D.
name: Henri, M.
name: La Commara, M.
name: Neindre, N. Le
name: Lombardo, I.
name: Lopez, O.
name: Manduci, L.
name: Parlog, M.
name: Roy, R.
name: Vigilante, G. Verde. M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: By using freeze-out properties of multifragmenting hot nuclei produced in quasifusion central $^{129}$Xe+$^{nat}$Sn collisions at different beam energies (32, 39, 45 and 50 AMeV) which were estimated by means of a simulation based on experimental data collected by the $4π$ INDRA multidetector, heat capacity in the thermal excitation energy range 4 - 12.5 AMeV was calculated from total kinetic energies and multiplicities at freeze-out. The microcanonical formulation was employed. Negative heat capacity which signs a first order phase transition for finite systems is observed and confirms previous results using a different method.
description: 6 pages,5 figures. arXiv admin note: text overlap with arXiv:1903.02881
Proto-clusters in the Lambda CDM Universe
Creators: name: Suwa, Tamon
name: Habe, Asao
name: Yoshikawa, Kohji
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We compare the highly clustered populations of very high redshift galaxies with proto-clusters identified numerically in a standard $Λ$CDM universe ($Ω_0=0.3, λ_0=0.7$) simulation. We evolve 256^3 dark matter particles in a comoving box of side 150h^{-1}Mpc. By the present day there are 63 cluster sized objects of mass in excess of 10^{14}h^{-1}Mo in this box. We trace these clusters back to higher redshift finding that their progenitors at z=4--5 are extended regions of typically 20--40 Mpc (comoving) in size, with dark halos of mass in excess of 10^{12}h^{-1}Mo and are overdense by typically 1.3--13 times the cosmological mean density. Comparison with the observation of Lyman alpha emitting (LAEs) galaxies at z=4.86 and at z=4.1 indicates that the observed excess clustering is consistent with that expected for a proto-cluster region if LAEs typically correspond to massive dark halos of more than 10^{12}h^{-1}Mo. We give a brief discussion on the relation between high redshift concentration of massive dark halos and present day rich clusters of galaxies.
description: 4 pages, 5 figures, Accepted for publication in ApJ Letters