cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Επιχειρησιακή Αξιοποίηση Δικτύων Αισθητήρων – Νευρωνικών Δικτύων – Pattern Recognition:
Creators: name: Χατζηλευτέρης-Μιχαλάς, Χρήστος Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Αισθητήρας
Νευρωνικό
Αναγνώριση
Sensor
Neural
Recognition

description: Η έγκαιρη και έγκυρη πληροφόρηση ήταν, είναι και θα είναι παράγοντας θεμελιώδους και καθοριστικής σημασίας παράγοντας για την έκβαση μιας εμπορικής, διπλωματικής ή πολεμικής αναμέτρησης. Ειδικά τη σημερινή εποχή που τα πάντα κινούνται και διεξάγονται με ιλιγγιώδη ταχύτητα και η πληροφορία σε οποιοδήποτε θέμα κατακλύζει τον ενδιαφερόμενο, αντιλαμβανόμαστε ότι η ταχύτητα λήψης και η αυθεντικότητα της πληροφορίας παίζουν τον πρωταρχικό ρόλο. Παράλληλα, η επικρατούσα τάση είναι να χρησιμοποιείται για την κάθε εργασία το λιγότερο δυνατόν ανθρώπινο δυναμικό, με το μικρότερο κόστος τόσο σε επίπεδο κατασκευαστικό όσο και σε λειτουργικό επίπεδο (π.χ. εργατοώρες). Όλα τα προαναφερόμενα ζητούμενα καλύπτονται από τα δίκτυα αισθητήρων που χρησιμοποιούνται για τη συλλογή επιχειρησιακά χρήσιμης πληροφορίας, αντικαθιστώντας τον άνθρωπο. Στο πρώτο κεφάλαιο της παρούσας εργασίας αναφέρονται οι συνήθεις αισθητήρες που χρησιμοποιούνται. Κατόπιν, αναλύεται ο τρόπος διασύνδεσης των αισθητήρων και η τοπολογία τους εντός των δικτύων καθώς και ο τρόπος μετάδοσης της συλλεγμένης πληροφορίας. Τέλος, επεξηγούνται τα νευρωνικά δίκτυα και ο τρόπος που υλοποιείται η αναγνώριση αντικειμένων (Pattern Recognition). Το δεύτερο κεφάλαιο καλύπτει τις επιχειρησιακές απαιτήσεις για μεμονωμένους αισθητήρες και δίκτυα αυτών
description: Valid and on time infotmation was, is and will always be a vital and essential factor about the result of a commercial, diplomatic or military conflict. Especially nowadays, that everything takes place in a frenetic pace and the information overwhelms people, we can realise how important the receiving rate and the validity of the information. Meanwhile, we all want to use as little as possible staff, with the minimum cost. All these issues can be solved by using sensor networks that can replace people in the race to gain information. In Chapter 1 we can read about all the common sensors. The reader can also find a detailed analysis of the way that sensors are connected, how the the topology of their networks fuctions and finally how the information is transmitted.At the end of the Chapter 1, there is an analysis of Neural Networks and the way that Pattern Recognition takes place. In Chapter 2 somebody can read about the applications of sensors and their networks.
MicroRNAs preferentially target the genes with high transcriptional regulation complexity
Creators: name: Cui, Qinghua
name: Yu, Zhenbao
name: Pan, Youlian
name: Purisima, Enrico
name: Wang, Edwin
Publisher: name: arXiv
Year: 2007
Subjects: subject: Genomics (q-bio.GN)
subject: Molecular Networks (q-bio.MN)
subject: FOS: Biological sciences

description: Over the past few years, microRNAs (miRNAs) have emerged as a new prominent class of gene regulatory factors that negatively regulate expression of approximately one-third of the genes in animal genomes at post-transcriptional level. However, it is still unclear why some genes are regulated by miRNAs but others are not, i.e. what principles govern miRNA regulation in animal genomes. In this study, we systematically analyzed the relationship between transcription factors (TFs) and miRNAs in gene regulation. We found that the genes with more TF-binding sites have a higher probability of being targeted by miRNAs and have more miRNA-binding sites on average. This observation reveals that the genes with higher cis-regulation complexity are more coordinately regulated by TFs at the transcriptional level and by miRNAs at the post-transcriptional level. This is a potentially novel discovery of mechanism for coordinated regulation of gene expression. Gene ontology analysis further demonstrated that such coordinated regulation is more popular in the developmental genes.
description: supplementary data available at http://www.bri.nrc.ca/wang
title: Οι γυναίκες στη διαχείριση σχολικών μονάδων
title: Women in educational leadership
titleType: AlternativeTitle
Creators: name: Καρατάσιου, Ευτυχία
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2022
Subjects: subject: Γυναίκες
subject: Διοίκηση
subject: Σχολικές μονάδες

description: Η παρούσα εργασία αποτελεί μια έρευνα σχετικά με το κατά πόσο οι γυναίκες εκπαιδευτικοί νιώθουν την αυτοπεποίθηση και την ετοιμότητα να αναλάβουν μια διοικητική θέση, όπως αυτή της διευθύντριας, σε μια σχολική μονάδα. Το δείγμα της έρευνας αποτελείται από 100 γυναίκες εκπαιδευτικούς τόσο της Πρωτοβάθμιας όσο και της Δευτεροβάθμιας Εκπαίδευσης. Η έρευνα διεξήχθη με γραπτό ερωτηματολόγιο, το οποίο αποτελείται από 12 ερωτήσεις. Οι ερωτήσεις αποσκοπούσαν στο να ερευνηθούν τα αίτια που λειτουργούν ως τροχοπέδη για την γυναίκα εκπαιδευτικό για τη διεκδίκηση μιας διοικητικής θέσης σε μια σχολική μονάδα. Οι τελευταίες ερωτήσεις ερευνούν αν οι γυναίκες σήμερα είναι έτοιμες και έχουν την αυτοπεποίθηση να αναλάβουν διευθυντική θέση. Τα αποτελέσματα της έρευνας δείχνουν ότι στην Ελλάδα οι γυναίκες εκπαιδευτικοί θεωρούν ότι οι άντρες δεν θα πρέπει να ταυτίζονται με τη θέση του διευθυντή, καθώς και οι ίδιες θεωρούν τους εαυτούς τους ικανές. Ωστόσο, θεωρούν ότι υπάρχουν ακόμη και σήμερα εμπόδια που δεν βοηθούν τη γυναίκα να αναλάβει μια διοικητική θέση, με το μεγαλύτερο εμπόδιο να είναι οι οικογενειακές υποχρεώσεις.
Pauli blockade of the electron spin flip in bulk GaAs
Creators: name: Amo, A.
name: Vina, L.
name: Lugli, P.
name: Tejedor, C.
name: Toropov, A. I.
name: Zhuravlev, K. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: By means of time-resolved optical orientation under strong optical pumping, the k-dependence of the electron spin-flip time (t_sf) in undoped GaAs is experimentally determined. t_sf monotonically decreases by more than one order of magnitude when the electron kinetic energy varies from 2 to 30 meV. At the high excitation densities and low temperatures of the reported experiments the main spin-flip mechanism of the conduction band electrons is the Bir-Aronov-Pikus. By means of Monte-Carlo simulations we evidence that phase-space filling effects result in the blocking of the spin flip, yielding an increase of t_sf with excitation density. These effects obtain values of t_sf up to 30 ns at k=0, the longest reported spin-relaxation time in undoped GaAs in the absence of a magnetic field.
description: new author added, major changes in section IV (phenomenological model), minor changes throughout the entire manuscript
Έλεγχος κατακορυφότητας κτιρίων κατά τη διάρκεια της κατασκευής- Παρακολούθηση παραμορφώσεων τεχνικών έργων:
Creators: name: Μαρίτσα, Κασσιώπη Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Κατακορύφωση
Στοχοφόρο εξάρτημα
Πρίσματα
Monitoring
Vertical
Construction

description: Σκοπός της διατριβής ήταν η μελέτη του τρόπου με τον οποίο μπορεί να ελεγχθεί η ακρίβεια κατακορύφωσης των κτιρίων και των διαφόρων τεχνικών έργων τόσο κατά τη διάρκεια κατασκευής όσο και σε ήδη υφιστάμενες κατασκευές. Αρχικά αναφέρθηκαν γενικά στοιχεία για τα όργανα και τις μεθόδους κατακορύφωσης που έχουν χρησιμοποιηθεί ως τώρα. Έπειτα παρουσιάστηκαν οι μέθοδοι παρακολούθησης των παραμορφώσεων στα διάφορα τεχνικά έργα και η χρήση των γεωδαιτικών σταθμών σ’ αυτά. Στη συνέχεια έγινε μια αναλυτική αναφορά στα χαρακτηριστικά και στον τρόπο λειτουργίας του Παγκόσμιου συστήματος εντοπισμού θέσης GPS και των γεωδαιτικών σταθμών με στόχο τη σύγκρισή τους και τη διευκρίνιση των λόγων για τους οποίους χρησιμοποιείται μόνο ο ένας τύπος οργάνων στις συγκεκριμένες μετρήσεις υψηλής ακρίβειας. Τελικά προτάθηκε το στοχοφόρο εξάρτημα που κατασκευάστηκε, έγινε αναλυτική περιγραφή στη διαδικασία των μετρήσεων και στα αποτελέσματα που προέκυψαν από αυτές. Αναφέρθηκαν προτάσεις για την κατασκευή και τη χρήση κατάλληλης διάταξης με σκοπό τον έλεγχο της κατακορυφότητας κτιρίων κατά τη διάρκεια της κατασκευής και την παρακολούθηση παραμορφώσεων στα τεχνικά έργα.
description: The aim of the present thesis was to study how the accuracy of vertical buildings and other buildings can be monitored during the construction. Firstly, general information was referred on instrumentation and methods of vertical building that have been used so far. Futhermore, a description of the method to monitor deformations in various technical projects and the use of total stations on it, was mentioned. Then, there was a description of the operation and the features of global positioning system, GPS, and total stations. Finally, the reasons of preferring a total station against GPS, for measurements, were mentioned. Then there was a description of the target assembly which had been constructed, the operation, the measurements and the conclusions. Lastly, there were some suggestions for using it appropriately in the purpose of constructing vertical buildings.
Fluctuations in time intervals of financial data from the view point of the Gini index
Creators: name: Sazuka, Naoya
name: Inoue, Jun-ichi
Publisher: name: arXiv
Year: 2007
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Physics and Society (physics.soc-ph)
subject: Statistical Finance (q-fin.ST)
subject: FOS: Physical sciences
subject: FOS: Economics and business

description: We propose an approach to explain fluctuations in time intervals of financial markets data from the view point of the Gini index. We show the explicit form of the Gini index for a Weibull distribution which is a good candidate to describe the first passage time of foreign exchange rate. The analytical expression of the Gini index gives a very close value with that of empirical data analysis.
description: 6pages, 3figures, using elsart.cls
Improved search for $ν_μ\to ν_e$ oscillation in a long-baseline accelerator experiment
Creators: name: K2K Collaboration
name: Yamamoto, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We performed an improved search for $ν_μ\to ν_e$ oscillation with the KEK to Kamioka (K2K) long-baseline neutrino oscillation experiment, using the full data sample of $9.2 \times 10^{19}$\xspace protons on target. No evidence for a $ν_e$ appearance signal was found, and we set bounds on the $ν_μ\to ν_e$ oscillation parameters. At $Δm^2$ = $2.8 \times 10^{-3} \mathrm{eV}^2$, the best fit value of the K2K $ν_μ$ disappearance analysis, we set an upper limit of $\sin^2 2θ_{μe}$ $
description: 5 pages, 2 figures
Super-Mathematics Functions
Creators: name: Selariu, Mircea Eugen
name: Nitu, Marian
name: Smarandache, Florentin
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Mathematics (math.GM)
subject: FOS: Mathematics
subject: 32A17

description: In this paper we talk about the so-called SuperMathematics Functions (SMF), which often constiture the base for generating technical neo-geometrical objects.
description: 14 pages, many figures. Mircea Eugen Selariu (author), Marian Nitu (translator), Florentin Smarandache (translator, editor)
Σχέσεις μεταβλητότητας των τιμών στην αλυσίδα τροφίμων των Η.Π.Α.:
Creators: name: Μούκος, Γεώργιος Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Μεταβλητότητα
Δεσμευμένη συνδιακύμανση
Δεσμευμένη συσχέτιση
Volatility
Conditional Covariance
Conditional Correlation

description: Στην εργασία αυτή παρουσιάζονται και αναλύονται οι σχέσεις μεταβλητότητας τιμών των κυρίων ειδών κρέατος στην αγορά της Αμερικής. Οι τιμές αυτές περιλαμβάνουν την χονδρική και λιανική τιμή του μοσχαρίσιου, χοιρινού και κρέατος πουλερικών καθώς και τη τιμή φάρμας για το μοσχάρι και το χοιρινό. Οι σχέσεις αυτές μας δείχνουν πως αντιδράει η τιμή του ενός κρέατος σε σχέση με το άλλο στη πορεία του χρόνου και μας βοηθάει να εκτιμήσουμε το ρίσκο που διατρέχει το κλάδο αυτό. Τα αποτελέσματα δείχνουν μία ισχυρή συσχέτιση της τιμής φάρμας με τη χονδρική τιμή για το χοιρινό και το μοσχαρίσιο κρέας αλλά μία όχι τόσο μεγάλη για τη χονδρική και τη λιανική τιμή. Οι μεθοδολογία που υιοθετήθηκε για την εξαγωγή συμπερασμάτων ήταν αυτή του μοντέλου γενικευμένης αυτοπαλινδρόμησης δεσμευμένης ετεροσκεδαστικότητας (GARCH) και της δυναμικής δεσμευμένης συσχέτισης (DCC) τα οποία έβγαλαν σχεδόν ταυτόσημα αποτελέσματα για όλα τα ζευγάρια τιμών μας. Στο πρώτο κεφάλαιο δίνεται ένα θεωρητικό πλαίσιο μέσα στο οποίο ορίζονται οι κυριότερες έννοιες της διπλωματικής, όπως η μεταβλητότητα και τα αγροτικά προϊόντα. Στο δεύτερο παρουσιάζονται οι μαθηματικές σχέσεις που διέπουν τα μοντέλα που χρησιμοποιήσαμε για την επεξεργασία των δεδομένων. Στο τρίτο κεφάλαιο γίνεται παρουσίαση και συζήτηση των δεδομένων αυτών και στο τέταρτο παραθέτουμε τα συμπεράσματα στα οποία μας οδήγησε η έρευνά μας.
description: In this thesis we present and analyze the relationship of price volatility among the main types of meat in the U.S.A. market. For the beef and pork meat we use farm, wholesale and retail price and for poultry we use wholesale and retail price. The relationships show how a certain price affects another type of price through time and help us estimate the risk in this market. The results give us a strong correlation between farm and wholesale price and weaker correlation between wholesale and retail price for pork and beef. In order to produce our results we used the univariate General Autoregressive Conditional Heteroscedasticity (GARCH) model and two types of multivariate GARCH model, the diagonal BEKK and the Dynamic Conditional Correlation (DCC) model. Both of those models gave similar results for every type o meat. In the first chapter of our thesis we give the definitions of the key concepts used, e.g. volatility and agricultural commodities. In the second chapter we present the mathematical framework of the models used and in the third chapter we give the results those models yielded. In the fourth and last chapter of our analysis we discuss those results and give our conclusions.
A Model of Large Quintessence Isocurvature Fluctuations and Low CMB Quadrupole
Creators: name: Karwan, Khamphee
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Based on quintessence models with anticorrelation between the quintessence fluctuations and adiabatic perturbations in the other matter components, we show that if the quintessence potential is sufficiently steep in the initial era, i.e., at the beginning of radiation dominated epoch, the quintessence fluctuations can be large enough to sufficiently suppress the CMB power spectrum at low multipoles without excess gravitational waves. The leaping kinetic term quintessence and the crossover quintessence models, can realize such steep potential at the initial stage, and therefore can give rise to a low CMB quadrupole as required by observations.
description: 13 pages, 5 figures; revised version to appear in JCAP; references added
Rectification effects in coherent transport through single molecules
Creators: name: Pump, Florian
name: Cuniberti, Gianaurelio
Publisher: name: arXiv
Year: 2006
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A minimal model for coherent transport through a donor/acceptor molecular junction is presented. The two donor and acceptor sites are described by single levels energetically separated by an intramolecular tunnel barrier. In the limit of strong coupling to the electrodes a current rectification for different bias voltage polarities occurs. Contacts with recent experiments of molecular rectification are also given.
description: 10 pages, 4 figures
Ο ρόλος της γυναίκας στο ποιμαντικό έργο της ενορίας σε αλλοθρησκή κοινωνία:
Creators: name: Alshreiki, Rasha Fahed
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Ποιμαντική
Ενορία
Διακονία
Pastoral theology
Parish - community
Ministration

description: Σκοπός της διατριβής ήταν η μελέτη του ρόλου της γυναίκας στο ποιμαντικό έργο της ενορίας σε αλλόθρησκη κοινωνία. Εξετάσαμε το ρόλο της γυναίκας στην χριστιανική μας παράδοση και τους τομείς της εργασίας της στην Εκκλησία. Στη συνέχεια παρουσιάσαμε αναλυτικά τα χαρακτηριστικά της πολυθρησκευτικής κοινωνίας (π.χ. Μέση Ανατολή), καθώς και την θέση της γυναίκας σε αυτές τις χώρες. Ακόμη αναφερθήκαμε αναλυτικά στα παραδείγματα του έργου των γυναικών μέσα στην Εκκλησία ως μητέρες, πρεσβυτέρες, και εργάτες του αποστολικόυ έργου, και διαπιστώσαμε την σημαντικότητα του ρόλου τους σε όλους τους τομείς.
description: The aim of the thesis was to study the role of women in the pastoral work of the parish in a society with a different religion. We examined the role of women in our Christian tradition and in the different fields of ministration in the Church. Then we presented in detail the features of multireligious society (eg Middle East), and the position of women in these countries. Also it is discussed in detail the examples of the ministration of women in the Church as mothers, elders and workers of apostolic work, and we realized the importance of their role in all areas.
La coproduction du discours dans les situations de communication exolingues
Creators: name: Thörle, Britta
Publisher: name: Universitätsbibliothek Siegen
Year: 2017
Subjects: subject: 440 Französisch, romanische Sprachen allgemein
subject: Co-construction
subject: Exolingual communication
subject: Second language acquisition
subject: Repair
subject: Resonance
subject: Fremdsprachenlernen
subject: Diskursanalyse
subject: Interpersonale Kommunikation
subject: Konversation

description: This paper focuses on the collaborative utterance production in conversations between native and non-native speakers of French from a conversation analysis point of view. Three types of phenomena will be analyzed: a) the joint completion of incomplete utterances, b) the collaborative treatment of “problematic” utterances, and b) the student’s exploitation of the native speaker’s model for the construction of his own utterance. The analysis is based on a corpus of simulated telephone conversations between German students of French and French native speakers.
Measurement of the W boson helicity in top quark decay at D0
Creators: name: D0 Collaboration
name: Abazov, V. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present a measurement of the fraction f_+ of right-handed W bosons produced in top quark decays, based on a candidate sample of ttbar events in the l+jets and dilepton decay channels corresponding to an integrated luminosity of 370 pb^-1 collected by the DO detector at the Fermilab Tevatron ppbar Collider at sqrt{s}=1.96 TeV. We reconstruct the decay angle theta^* for each lepton. By comparing the \cosθ^* distribution from the data with those for the expected background and signal for various values of f_+, we find $f_+=0.056 +- 0.080 (stat) +- 0.057 (syst)}. (f_+ < 0.23 at 95% C.L.), consistent with the standard model prediction of f_+=3.6 x10^-4.
description: Submitted to Phys. Rev. Lett
Airborne synthetic aperture radar, digital terrain models, and geographic information systems: tools for mapping and managing large landslide hazards in southwestern British Columbia
Creators: name: Leir, Mark Charles
Publisher: name: University of British Columbia
Year: 2009

description: This research demonstrates the use of airborne synthetic aperture radar (SAR) and Geographic Information Systems (GIS) for mapping and predicting large rock landslide occurrences in southwestern British Columbia. Lineaments in the Chilliwack area are mapped using geocoded 10 m resolution 1:20,000, 1:50,000, and 1:80,000 scale C-band SAR and compared to lineaments mapped with 1:50,000 scale black and white stereo airphotos. SAR lineament length and trend correlate well with airphoto lineaments and provide additional structural information about the Chilliwack area. Testing the ability of SAR to locate specific airphoto lineaments reveals that SAR tends to find the longer airphoto lineaments. SAR is useful for detecting geomorphological landslide features such as lineaments, antislope scarps, deformation zones, and especially hummocky debris lobes, cone and fans. In areas covered by cultivation, logging activity, or mature forest, SAR proves most useful for revealing landslide debris and lineaments especially where tree canopy height corresponds subtle changes in ground morphology. Depending on the viewing geometry, SAR is able to detect landslide source and deposition zones not apparent in stereo airphotos. Spatial relationships between regional faults, lineaments, plutonic contacts, bedrock geology, slope angle, and landslide hazard occurrence are explored using the IDRISI GIS and an objective multivariate statistical methodology called weights of evidence. Weights of evidence modelling determines landslide potential for regions where representative landslide occurrences are known, estimates uncertainty, ranks predictive power of input maps, and accounts for missing or incomplete data. The method is particularly well-suited for modelling multiclass maps and proximity to linear features. The top five predictor maps are: 1) Custer Gneiss; 2) within 1300 m of a fault trace; 3) within 1200 m of a lineament; 4) Cultus Formation; 5) Chilliwack Formation, and; 5) Spuzzum Pluton. The proximity to a plutonic contact and slopes less than 20° are not positive predictors of landslide occurrence. Predictor map weights are combined and map of posterior probability for predicting landslide occurrence is created. Areas of relative high landslide occurrence include the Fraser Canyon near Yale, the slopes above Chilliwack and the upper Chilliwack Valley, and adjacent to the Ross Lake Fault south of Hope. Adding this hazard zonation map with socio-economic criteria and landslide runout models within a GIS builds risk maps essential for development planning in mountainous terrain.
Thermal expansion of the quasi two-dimensional magnetic layered compound BaNi$_{2}$V$_{2}$O$_{8}$ under magnetic fields along c-axis
Creators: name: Knafo, W.
name: Meingast, C.
name: Grube, K.
name: Drobnik, S.
name: Popovich, P.
name: Schweiss, P.
name: Wolf, Th.
name: Loehneysen, H. v.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The quasi two-dimensional magnetic BaNi$_{2}$V$_{2}$O$_{8}$ is studied by using high-resolution thermal expansion in magnetic fields up to 10 T applied along the c-axis. A slight increase of about 1 % of the three-dimensional antiferromagnetic ordering temperature $T_N$ is observed at 10 T. Positive and negative pressure dependencies of $T_N$, respectively, are inferred from the thermal expansion $α(T)$ for pressures applied along the $a$- and $c$-axes.
description: 2 pages, 3 figures; proceedings of ICM 06
title: Διερεύνηση της ποιότητας του ατμοσφαιρικού αέρα στο δημοτικό σχολείο. Οι επιδράσεις του διοξειδίου του άνθρακα μέσα στις σχολικές αίθουσες.
title: Survey on primary school’s air quality. The effects of carbon dioxide inside classrooms.
titleType: AlternativeTitle
Creators: name: Λαμπρόπουλος, Χρήστος
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2022
Subjects: Ποιότητα εσωτερικού αέρα
Εσωτερική περιβαλλοντική ποιότητα
Διοξείδιο του άνθρακα
Σχολείο
Σχολική επίδοση
CO2

description: Η μελέτη αυτή παρουσιάζει μια εξαμηνιαία έρευνα (από Ιανουάριο έως Ιούνιο του 2019) αναφορικά με τα επίπεδα συγκέντρωσης του διοξειδίου του άνθρακα (CO2) σε τάξεις ενός δημοτικού σχολείου. Το CO2 είναι ένα βασικό ανθρωπογενές αέριο ρύπανσης, που συνδέεται στενά με την ποιότητα του εσωτερικού αέρα (Indoor Air Quality/IAQ), που, με τη σειρά του, είναι ένας σημαντικός παράγοντας της εσωτερικής περιβαλλοντικής ποιότητας (Indoor Environ mental Quality/IEQ). Τα υψηλά επίπεδα CO2 έχουν αποδειχθεί ότι επηρεάζουν σημαντικά τη συνολική ποιότητα του εσωτερικού αέρα (IAQ), επηρεάζοντας την υγεία και τη γνωστική λειτουργία, οδηγώντας σε πολλές απουσίες από τα σχολεία (ή την εργασία), σε προβλήματα υγείας και σε μειωμένα ακαδημαϊκά (ή παραγωγικά) αποτελέσματα. Δεδομένου ότι τα ελληνικά σχολεία, στην πλειονότητά τους, δεν έχουν τεχνητά συστήματα μόνιμου εξαερισμού στα κτίριά τους, όπως και το σχολείο της μελέτης, η έρευνα προσπάθησε να διαπιστώσει εάν ο φυσικός αερισμός (παράθυρα) και ο βοηθητικός αερισμός (ανεμιστήρες) είναι αρκετά για να διατηρήσουν τα επίπεδα του CO2 σε αποδεκτά επίπεδα, όπως καθορίζουν τα πρότυπα ασφαλείας (<1000 ppm). Ένας αισθητήρας (Kane Alert CO2) τοποθετούνταν εναλλακτικά σε δυο αίθουσες διδασκαλίας και κάθε 10 λεπτά καταγραφόταν το επίπεδο του CO2 σε ppm (καθώς και η θερμοκρασία δωματίου σε C) κατά τη διάρκεια των μαθημάτων της τάξης. Ο βαθμός συσσώρευσης του CO2 στην τάξη αξιολογήθηκε σε σχέση με τη θερμοκρασία δωματίου, το μέγεθος της τάξης, το ύψος της τάξης, τον αριθμό των μαθητών, τον αριθμό των ανοιχτών παραθύρων, το μέγεθος των παραθύρων, το αν η πόρτα της αίθουσας ήταν ανοικτή ή όχι, το μέγεθος της πόρτας, και συνδυάστηκε με εξωτερικά μετεωρολογικά δεδομένα (θερμοκρασία, ταχύτητα ανέμου, βροχή, ατμοσφαιρική πίεση) που ανακτήθηκαν από το Εθνικό Αστεροσκοπείο Αθηνών (Μετεωρολογικός Σταθμό Περιστερίου, που απέχει 1,8 χλμ. από το σχολείο) . Το επίπεδο του CO2 που συσσωρεύεται στις σχολικές τάξεις κατά τη διάρκεια των μαθημάτων αποτελεί ένα ισχυρό δείκτη για την επίτευξη καλής σχολικής, γνωστικής και μαθησιακής, επίδοσης και η γνώση του γεγονότος αυτού μπορεί να οδηγήσει σε αλλαγές συμπεριφοράς (συνεχής συνειδητοποίηση των επιπέδων IAQ, άνοιγμα παραθύρων κ.λπ.) που θα εξασφαλίζουν τα αποδεκτά επίπεδα CO2 μέσα στη σχολική αίθουσα και, συνεπακόλουθα, θα εξασφαλίζουν καλύτερα ακαδημαϊκά αποτελέσματα για τους μαθητές των σχολείων μας.
title: The American Samoa Longline Limited-entry Fishery Quarterly Report 1 April–30 June 2023
Creators: name: Pacific Islands Fisheries Science Center (U.S.). Fisheries Research and Monitoring Division
Publisher: name: NOAA National Marine Fisheries Service Pacific Islands Fisheries Science Center
publisherIdentifier: https://ror.org/02apffz65
publisherIdentifierScheme: ROR
Year: 2024

description: PIFSC data report ; DR-24-19
description: Effort and catch statistics for the American Samoa longline limited-entry fishery reported by fishers on electronic and paper logs are summarized for the second quarter of 2023 (1 April–30 June; PIFSC, 2024).
Failure of Parameter Identification Based on Adaptive Synchronization Techniques
Creators: name: Lin, Wei
name: Ma, Huan-fei
Publisher: name: arXiv
Year: 2007
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: In the paper, several concrete examples, as well as their numerical simulations, are given to show that parameter identification based on the so-called adaptive synchronization techniques might be failed if those functions with parameters pending for identification in coupled systems are designed to be mutually linearly dependent or approximately linearly dependent on the orbit in the synchronization manifold. This failure might be emergent not only when the synchronized orbit is selected to be some sort of equilibrium or some sort of periodic oscillation, but also when it is taken as some type of chaotic attractor produced by driving system. This result implies that chaotic property of driving signal is not necessary to achievement of parameter identification. The mechanism inducing such a failure, as well as the bounded property of all trajectories generated by coupled systems, is theoretically expatiated. New synchronization techniques are proposed to rigorously realize the complete synchronization and parameter identification in a class of systems where the nonlinearity is not globally Lipschitz. In addition, parameter identification are discussed for systems with time delay.
description: 8 Figures
title: Το χαρτί ως εργαλείο κατανόησης εννοιών των Φυσικών Επιστημών στην Πρωτοβάθμια Εκπαίδευση και εφαρμογής σε συμπεριληπτικά περιβάλλοντα
title: The paper as a tool for understanding the concepts of Natural Sciences in Primary Education and its application in inclusive environments
titleType: AlternativeTitle
Creators: name: Κωστάκη, Δωροθέα-Μαργαρίτα
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2022
Subjects: Χαρτί
Φυσικές Επιστήμες
Συμπεριληπτικά περιβάλλοντα
Διαφοροποίηση
Πειράματα

description: Οι Φυσικές Επιστήμες αξιοποιούνται σε όλα τα Προγράμματα σπουδών στη Δευτεροβάθμια και στην Πρωτοβάθμια εκπαίδευση. Τις πιο πολλές φορές οι Φυσικές Επιστήμες διδάσκονται με αφηρημένο τρόπο μέσω της βοήθειας της κιμωλίας και του πίνακα, αδυνατώντας να συμπεριλάβουν ένα μεγάλο μέρος των μαθητών, ενώ από αυτούς ζητείται η απομνημόνευση, κατά κύριο λόγο, της νέας γνώσης, χωρίς τη συμμετοχή τους σε πειραματικές αλλά παράλληλα και σε άλλες μαθησιακές δραστηριότητες, προκειμένου να αναλάβουν πρωταγωνιστικό ρόλο στη μάθησή τους. Επειδή ο μαθητικός πληθυσμός καλείται να μάθει μία εκτεταμένη διδακτέα ύλη, που διδάσκεται με την αξιοποίηση παραδοσιακών μεθόδων, σε αρκετές περιπτώσεις θεωρείται ένα ιδιαίτερα δύσκολο μάθημα. Για τον λόγο αυτό θεωρείται αναγκαίος ο εκσυγχρονισμός της διδακτικής των Φυσικών Επιστημών, κυρίως, στην Πρωτοβάθμια Εκπαίδευση, και η αξιοποίηση πρακτικών, που μπορούν να προσελκύσουν το ενδιαφέρον των παιδιών. Στα σύγχρονα εκπαιδευτικά συστήματα είναι επιτακτική η ανάγκη για διαφοροποίηση της διδασκαλίας, με στόχο την παρέμβαση στην εκπαίδευση των παιδιών και την ολόπλευρη ανάπτυξή τους, που αφορά όχι μόνο αυτά με ιδιαίτερες εκπαιδευτικές ανάγκες, αλλά ολόκληρο τον μαθητικό πληθυσμό. Η διαφοροποιημένη διδασκαλία είναι μια φιλοσοφία διδασκαλίας, η οποία εμπεριέχει τα χαρακτηριστικά εκείνα που την κάνουν αποτελεσματική για το σύνολο των μαθητών. Για τον λόγο, αυτό στην εργασία αυτή μελετάται η αξιοποίηση του χαρτιού στη Διδακτική των Φυσικών Επιστημών στην Πρωτοβάθμια Εκπαίδευση, καθώς το χαρτί θεωρείται ένα από τα πιο σημαντικά υλικά. Τέλος, με την εργασία αυτή δίνεται η δυνατότητα κατανόησης του ρόλου του χαρτιού στη Διδακτική των Φυσικών Επιστημών στα πλαίσια μιας πιο συμπεριληπτικής προσέγγισης, παρέχοντας το ερέθισμα για την περαιτέρω διερεύνηση αυτού του θέματος.
Silurian stratigraphy and graptolite faunas of the Mora 001 and Solberga 1 drill cores, Siljan District, central Sweden
Creators: name: Maletz, Jörg
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Dalarna
subject: graptolite biostratigraphy
subject: lithostratigraphy
subject: Siljan impact
subject: Silurian
subject: 500 Naturwissenschaften und Mathematik::550 Geowissenschaften, Geologie::550 Geowissenschaften

description: The Mora 001 and Solberga 1 drill cores provide the best available overview on the early Silurian (Llandovery, Rhuddanian to Telychian) graptolite succession available for the Siljan Ring impact structure of central Sweden. The Solberga 1 succession includes a nearly complete graptolite succession from the Pernerograptus revolutus Biozone (late Rhuddanian) to the Oktavites spiralis Biozone (late Telychian). Older graptolite faunas are unknown from the Siljan region. The Mora 001 drill core includes a graptolitic succession from the Monoclimacis crenulata Biozone to the O. spiralis Biozone, found in two lithostratigraphically separated lithological units here identified as the Kallholn Formation. A slice of the Orsa Sandstone Formation of possible later Silurian age is tectonically introduced into the Kallholn Formation in the Mora 001 drill core. The strong tectonic deformation of the Kallholn Formation in both drill cores can easily be understood through the Devonian impact history of the region.
Picard group of moduli of hyperelliptic curves
Creators: name: Gorchinskiy, Sergey
name: Viviani, Filippo
Publisher: name: arXiv
Year: 2006
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14D22, 14H10, 14C22

description: The main subject of this work is the difference between the coarse moduli space and the stack of hyperelliptic curves. We compute their Picard groups, giving explicit description of the generators. We get an application to the (non-)existence of a tautological family over the coarse moduli space.
description: 13 pages. Section 2 has been shortened and the final appendix has been erased. Final version, to appear on Math. Zeit
Cathodoluminescence of carbon-related defects in hexagonal boron nitride
Creators: name: Petrov, Yu V.
name: Vyvenko, O. F
name: Gogina, O. A.
name: Bolotin, Kirill
name: Kovalchuk, Sviatoslav
name: Watanabe, K.
name: Taniguchi, T.
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Cathodoluminescence
subject: Hexagonal boron nitride
subject: wide band gap semiconductors
subject: scanning electron microscope
subject: single photon source
subject: 500 Naturwissenschaften und Mathematik::530 Physik::539 Moderne Physik

description: Hexagonal boron nitride is a wide band gap semiconductor exhibiting various luminescence bands in visible and near ultraviolet range, which can be used as single photon source. The luminescence band with zero phonon line at 4.1 eV is commonly ascribed to the carbon impurity introduced during crystal growth. In this paper we provide experimental evidence that carbon-related luminescent centers can be introduced in hBN by local electron irradiation in the chamber of scanning electron microscope at room temperature that can be used as a technique for the nanofabrication of single photon source devices with desired pattern.
Secure Identification of Free-Floating Planets
Creators: name: Han, Cheongho
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Among the methods proposed to detect extrasolar planets, microlensing is the only technique that can detect free-floating planets. Free-floating planets are detected through the channel of short-duration isolated lensing events. However, if a seemingly isolated planetary event is detected, it is difficult to firmly conclude that the event is caused by a free-floating planet because a wide-separation planet can also produce an isolated event. There were several methods proposed to break the degeneracy between the isolated planetary events produced by the free-floating and wide-separation planets, but they are incomplete. In this paper, we show that free-floating planets can be securely identified by conducting astrometric follow-up observations of isolated events to be detected in future photometric lensing surveys by using high-precision interferometers to be operated contemporarily with the photometric surveys. The method is based on the fact that astrometric lensing effect covers much longer range of the lens-source separation than the photometric effect. We demonstrate that several astrometric follow-up observations of isolated planetary events associated with source stars brighter than $V\sim 19$ by using the {\it Space Interferometry Mission} with an exposure time of $\lesssim 10 {\rm min}$ for each observation will make it possible to measure the centroid shift induced by primaries with projected separations up to $\sim 100 {\rm AU}$. Therefore, the proposed method is far more complete than previously proposed methods that are flawed by the limited applicability only to planets with projected separations $\lesssim 20 {\rm AU}$ or planets accompanied by bright primaries.
description: 5 pages including 2 figures
Coagulation factor XII, XI, and VIII activity levels and secondary events after first ischemic stroke
Creators: name: Rohmann, Jessica L.
name: Huo, Shufan
name: Sperber, Pia S.
name: Piper, Sophie K.
name: Rosendaal, Frits R.
name: Heuschmann, Peter U.
name: Endres, Matthias
name: Liman, Thomas G.
name: Siegerink, Bob
Publisher: name: Charité - Universitätsmedizin Berlin
Year: 2020
Subjects: subject: coagulation
subject: factor VIII
subject: factor XI
subject: factor XII
subject: ischemic stroke
subject: 600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit::610 Medizin und Gesundheit

description: Background: Though risk for recurrent vascular events is high following ischemic stroke, little knowledge about risk factors for secondary events post-stroke exists. Objectives: Coagulation factors XII, XI, and VIII (FXII, FXI, and FVIII) have been implicated in first thrombotic events, and our aim was to estimate their effects on vascular outcomes within 3 years after first stroke. Patients/Methods: In the Prospective Cohort with Incident Stroke Berlin (PROSCIS-B) study, we followed participants aged 18 and older for 3 years after first mild to moderate ischemic stroke event or until occurrence of recurrent stroke, myocardial infarction, or all-cause mortality. We compared high coagulation factor activity levels to normal and low levels and also analyzed activities as continuous variables. We used Cox proportional hazards models adjusted for age, sex, and cardiovascular risk factors to estimate hazard ratios (HRs) for the combined endpoint. Results: In total, 94 events occurred in 576 included participants, resulting in an absolute rate of 6.6 events per 100 person-years. After confounding adjustment, high FVIII activity showed the strongest relationship with the combined endpoint (HR = 2.05, 95% confidence interval [CI] 1.28–3.29). High FXI activity was also associated with a higher hazard (HR = 1.80, 95% CI 1.09–2.98), though high FXII activity was not (HR = 0.86, 95% CI 0.49–1.51). Continuous analyses yielded similar results. Conclusions: In our study of mild to moderate ischemic stroke patients, high activity levels of FXI and FVIII but not FXII were associated with worse vascular outcomes in the 3-year period after first ischemic stroke.
Coupling constants of $D^*D_sK$ and $D_s^*DK$ processes
Creators: name: Bracco, M. E.
name: Lozea, A.
name: Cerqueira, A.
name: Chiapparini, M.
name: Nielsen, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We calculate the coupling constants of $D^*D_sK$ and $D_s^*DK$ vertices using the QCD sum rules technique. We compare results obtained in the limit of SU(4) symmetry and found that the symmetry is broken on the order of 40%.
description: 4 pages, 3 ps figures. Talk presented in the 18 Workshop on Hadron Interactions, IFUSP, Sao Paulo, Brazil, may 22-24 of 2006
Influence of implant‐specific radiation doses on peri‐implant hard and soft tissue: An observational pilot study
Creators: name: Neckel, Norbert
name: Wagendorf, Pia
name: Sachse, Claudia
name: Stromberger, Carmen
name: Vach, Kirstin
name: Heiland, Max
name: Nahles, Susanne
Publisher: name: Charité - Universitätsmedizin Berlin
Year: 2020
Subjects: subject: clinical research
subject: clinical trials
subject: CT Imaging
subject: diagnosis
subject: clinical assessment
subject: patient-centered outcomes
subject: radiology
subject: imaging
subject: soft tissue–implant interactions
subject: 600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit::610 Medizin und Gesundheit

description: Objectives: The aim of this study was to investigate the influence of real implant-bed-specific radiation doses on peri-implant tissue health in head and neck cancer (HNC) patients after radiotherapy. Material and methods: Specific radiation doses in the area of 81 implants, in 15 irradiated HNC patients, were analyzed by matching data from the radiotherapy planning system with those of three-dimensional follow-up scans after implantation. Peri-implant bone resorption was measured radiographically after 1 and 3 years, and peri-implant tissue health was evaluated clinically. Individual parameters, such as age, gender, and localization, regarding the implant-specific radiation dose distribution were analyzed statistically. Results: The mean implant-bed-specific radiation dose was high, with 45.95 Gy to the mandible and 29.02 Gy to the maxilla, but significantly lower than the mean total dose to the tumor bed. Peri-implant bone resorption correlated with local inflammation and plaque. After 1 year, women temporarily showed significantly more bone loss than men and implant-specific radiation dose had a significant impact on peri-implant bone loss after 3 years. Conclusions: The presented method is a feasible option to define precise implant-bed-specific radiation doses for research or treatment planning purposes. Implant-based dental restoration after radiotherapy is a relatively safe procedure, but a negative radiation dose-dependent long-term effect on peri-implant bone resorption calls for interdisciplinary cooperation between surgeons and radio-oncologists to define high-risk areas.
2-Dimensional Kinematics of Simulated Disc Merger Remnants
Creators: name: Jesseit, Roland
name: Naab, Thorsten
name: Peletier, Reynier
name: Burkert, Andreas
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a two-dimensional kinematic analysis for a sample of simulated binary disc merger remnants with mass ratios 1:1 and 3:1. For the progenitor discs we used pure stellar models as well as models with 10% of their mass in gas. A multitude of phenomena also observed in real galaxies are found in the simulations. These include misaligned rotation, embedded discs, gas rings, counter-rotating cores and kinematic misaligned discs. Using the 2D maps we illustrate projection effects and the change in properties of a merger remnant when gas is included in the merger. We find that kinematic peculiar subsystems are preferably formed in equal mass mergers. Equal-mass collisionless remnants can show almost no rotation, regular rotation or strong kinematic misalignment. The inclusion of gas makes the remnants appear more round(1:1) and axisymmetric(3:1). Counter-Rotating Cores (CRCs) are almost exclusively formed in equal-mass mergers with a dissipational component. 3:1 remnants show a much more regular structure. We quantify these properties by applying the kinemetric methods recently developed by Krajnović et al. This work will help to understand observations of elliptical galaxies with 2D field spectrographs, like SAURON.
description: accepted for publication in MNRAS, discussion substantially enlarged, conclusion unchanged
Cannabidivarin for HIV‐Associated Neuropathic Pain: A Randomized, Blinded, Controlled Clinical Trial
Creators: name: Eibach, Luca
name: Scheffel, Simone
name: Cardebring, Madeleine
name: Lettau, Marie
name: Celik, Melih Özgür
name: Morguet, Andreas
name: Roehle, Robert
name: Stein, Christoph
Publisher: name: Charité - Universitätsmedizin Berlin
Year: 2020
Subjects: subject: cannabinoids
subject: HIV infections
subject: neuralgia
subject: 600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit::610 Medizin und Gesundheit

description: HIV remains a major burden to the health care system and neuropathic pain is the most common neurological complication of HIV infection. Because current treatment strategies often lack satisfying pain relief, cannabinoids (CBs) are discussed as a new option. We investigated cannabidivarin (CBDV) as treatment for HIV-associated neuropathic pain. We conducted a randomized, double-blind, placebo-controlled crossover study. Patients underwent two successive treatment phases (4 weeks each) and were treated with CBDV (400 mg/day) or placebo in a randomized order. A 3-week washout phase was designed to eliminate potential carry-over effects. Patients were followed up for 3 weeks after the end of the second treatment phase. The primary end point was pain intensity on an 11-point numeric rating scale, recorded in a diary. Secondary end points were additional pain medication, pain characteristics, and quality of life. We included 32 patients. The mean pain intensity under CBDV was 0.62 points higher compared with placebo (P = 0.16, 95% confidence interval -0.27 to 1.51). CBDV did not influence the amount of additional pain medication, pain characteristics, or quality of life. The incidence of adverse events was similar during both treatments. No suspected unexpected adverse reactions occurred during either treatment. CBDV was safe but failed to reduce neuropathic pain in patients with HIV. This may be explained by a lack of CB receptor activation, as indicated by preclinical experiments. Although a larger patient number might be desirable, we would not expect a change in the conclusions because the present differences are far from statistical significance. Therefore, we would currently not consider CBDV as a clinically meaningful treatment option for neuropathic pain.
Manifolds of holomorphic mappings from strongly pseudoconvex domains
Creators: name: Forstneric, Franc
Publisher: name: arXiv
Year: 2006
Subjects: subject: Complex Variables (math.CV)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 32E10, 32E30, 32H02, 46G20, 46T10, 54C35, 58B12, 58D15

description: Let D be a bounded strongly pseudoconvex domain in a Stein manifold S and let Y be a complex manifold. We prove that the graph of any continuous map from the closure of D to Y which is holomorphic in D admits a basis of open Stein neighborhoods in S x Y. Using this we show that many classical spaces of maps from the closure of D to Y which are holomorphic in D are infinite dimensional complex manifolds which are modeled on locally convex topological vector spaces (Banach, Hilbert or Frechet).
Structure and Interpretation of Computer Programs
Creators: name: Narayan, Ganesh M.
name: Gopinath, K.
name: Sridhar, V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Software Engineering (cs.SE)
subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences
subject: D.2.8; D.2.3; D.2.5; D.2.10

description: Call graphs depict the static, caller-callee relation between "functions" in a program. With most source/target languages supporting functions as the primitive unit of composition, call graphs naturally form the fundamental control flow representation available to understand/develop software. They are also the substrate on which various interprocedural analyses are performed and are integral part of program comprehension/testing. Given their universality and usefulness, it is imperative to ask if call graphs exhibit any intrinsic graph theoretic features -- across versions, program domains and source languages. This work is an attempt to answer these questions: we present and investigate a set of meaningful graph measures that help us understand call graphs better; we establish how these measures correlate, if any, across different languages and program domains; we also assess the overall, language independent software quality by suitably interpreting these measures.
description: 9 pages, 10pt, double column, 15 figures
Constraints on Distance Duality Relation from Sunyaev Zel'dovich Effect and Chandra X-ray measurements
Creators: name: De Bernardis, Francesco
name: Giusarma, Elena
name: Melchiorri, Alessandro
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We demonstrate that the recent measurements of the angular diameter distance of 38 cluster of galaxies using Chandra X-ray data and radio observations from the OVRO and BIMA interferometric arrays place new and independent constraints on deviations in the duality relation between angular and luminosity distances. Using only cluster data, we found that the ratio between the two distances defined as $η= D_L/D_A(1+z)^2.$ is bound to be $η=0.97\pm0.03$ at 68% c.l. with no evidence for distance duality violation. Comparing the cluster angular diameter distance data with luminosity distance data from type Ia Supernovae, we obtain the model independent constraint $η=1.01\pm0.07$ at 68% c.l.. Those results provide an useful check for the cosmological concordance model and for the presence of systematics in SN-Ia and clusters data.
description: 9 Pages, 4 Figures. In press on IJMD