Calculated photoelectron pitch angle and energy spectra

Calculations of the steady-state photoelectron energy and angular distribution in the altitude region between 120 and 1000 km are presented. The distribution is found to be isotropic at all altitudes below 250 km, while above this altitude anisotropies in both pitch angle and energy are found. The isotropy found in the angular distribution below 250 km implies that photoelectron transport below 250 km is insignificant, while the angular anisotropy found above this altitude implies a net photoelectron current in the upward direction. The energy anisotropy above 500 km arises from the selective backscattering of the low energy photoelectron population of the upward flux component by Coulomb collisions with the ambient ions. The total photoelectron flux attains its maximum value between about 40 and 70 km above the altitude at which the photoelectron production rate is maximum. The displacement of the maximum of the equilibrium flux is attributed to an increasing (with altitude) photoelectron lifetime. Photoelectrons at altitudes above that where the flux is maximum are on the average more energetic than those below that altitude

The Iconographical Subject ''Christ the Vine'' in Byzantine and Post-byzantine Art

Το εικονογραφικό θέμα του Χριστού-Αμπέλου καθιερώθηκε στην Κρήτη κατά τον 15ο αιώνα από τον ζωγράφο Άγγελο Ακοτάντο. Η εμφάνιση και χρήση του τύπου συμπίπτει με τη σύνοδο της Φεράρας-Φλωρεντίας, ενώ και τα στοιχεία που τον απαρτίζουν συνηγορούν στη διατύπωση της θέσης ότι αποτελεί την εικαστική έκφραση των επιχειρημάτων της ενωτικής συνόδου. Στους επόμενους αιώνες η αναπαραγωγή του τύπου γνωρίζει τουλάχιστον τρεις εικονογραφικές παραλλαγές. Παράλληλα, το συμβολικό του περιεχόμενο ποικίλει και αναπροσαρμόζεται ειδολογικά, στη μνημειακή τέχνη, στην υφαντουργία ή τη μικροτεχνία. Τέλος, η παράσταση εμπλουτίζεται και με παλαιοδιαθηκικά στοιχεία ή την περιστερά του Αγίου Πνεύματος. The iconography of Christ the Vine emerged and crystallized in Crete during the 15th century by the painter Angelos Akotantos. The development of the type coincided with the Council of Ferrara-Florence. Additionally, the certain features of the type corroborate the assertion that the latter was actually used as the pictorial representation of the arguments that were expressed in the pro-Unionist Council. In the following centuries, the reproduction of the type evolved in at least three iconographic variations. It should be noted that its symbolic meaning differs and changes according to the genre it is in, i.e. monumental painting, embroidery or minor arts. Finally, the type can either be associated with Old Testament elements or the dove of the Holy Spirit.

Ubiquitous healthcare profile management applying smart card technology

Nowadays, the patient-centric healthcare approach is focused on ubiquitous healthcare services. Furthermore, the adoption of cloud computing technology leads to more efficient ubiquitous healthcare systems. Moreover, the personalization of the delivery of ubiquitous healthcare services is enabled with the introduction of user profiles. In this paper, we propose five generic healthcare profile structures corresponding to the main categories of the participating entities included in a typical ubiquitous healthcare system in a cloud computing environment. In addition, we propose a profile management system incorporating smart card technology to increase its efficiency and the quality of the provided services of the ubiquitous healthcare system

PKI security in large-scale healthcare networks

During the past few years a lot of PKI (Public Key Infrastructures) infrastructures have been proposed for healthcare networks in order to ensure secure communication services and exchange of data among healthcare professionals. However, there is a plethora of challenges in these healthcare PKI infrastructures. Especially, there are a lot of challenges for PKI infrastructures deployed over large-scale healthcare networks. In this paper, we propose a PKI infrastructure to ensure security in a large-scale Internet-based healthcare network connecting a wide spectrum of healthcare units geographically distributed within a wide region. Furthermore, the proposed PKI infrastructure facilitates the trust issues that arise in a large-scale healthcare network including multi-domain PKI infrastructures

A new framework for ubiquitous context-aware healthcare applications

Nowadays, there is a significant lack of generic application frameworks providing third party developers with the appropriate mechanisms for building ubiquitous contextaware healthcare applications over medical heterogeneous networks. In this paper, we propose a new framework integrating context-aware and security mechanisms with mechanisms that allow the ease exploitation of the core networks’ functionality to enable third party developers to build reliable and secure ubiquitous context-aware healthcare applications over medical heterogeneous networks

«Ἄνθρωπος ἐν τιμῇ ὢν οὐ συνῆκε». Zu zwei Miniaturen des 48. Psalms

Η εικονογράφηση δύο στίχων του ψαλμού ΜΗ σε δύο διαφορετικές περιπτώσεις, του 21ου στίχου στο ψαλτήρι του Θεοδώρου του 1066 και του 13ου στίχου του στο ψαλτήρι του Κιέβου του 1397 με την ίδια παράσταση, όπου μια ανδρική μορφή ραβδίζει ένα δέντρο και οι καρποί που πέφτουν τρώγονται από τους χοίρους, παρουσιάζει ξεχωριστό ενδιαφέρον. Σύμφωνα και με άλλα εικαστικά στοιχεία η παράσταση θα πρέπει να ταυτιστεί με την εικονογράφηση της παραβολής του Ασώτου, όπου διαλαμβάνεται η εργασία του ως χοιροβοσκού. Τόσο οι πατερικές ερμηνείες του ευαγγελικού κειμένου, όσο και τα εξηγητικά σχόλια του ψαλμού ΜΗ αναφέρονται στην απώλεια της ανθρώπινης αξιοπρέπειας και στην εξομοίωση του ανθρώπου με τα ζώα. Με τους ίδιους συσχετισμούς θα πρέπει να ερμηνευθεί και η παράσταση του Ασώτου ως χοιροβοσκού.«’Ἅνθρωπος ἐν τιμῆ ὤν οὐ συνῆκε’; Two miniatures on the 48th Psalm»Αγγλική περίληψη: The illustration of two verses of the Psalm 48 in two different cases, the 21st verse in the Psalter of Theodore of the year 1066 and of the 13th verse in the Psalter of Kiev of the year 1397, with the same scene where a man beats a tree and the beans that fall are being eaten by the pigs presents special interest. According to other pictorial data the scene should be identified to that of the Prodigal son where it is cited that he worked as a swineherd. The patristic interpretation on the evangelic text as well as the exegetic comments on the Psalm 48 all refer to the loss of the human dignity and to the man’s equation to the animals. The same correlations should also be understood in the representation of the Prodigal son as a swineherd.

The Plasma Line Revisited as an Aeronomical Diagnostic: Suprathermal electrons, solar EUV, electron‐gas thermal balance

Spectra of plasma wave intensities (kTp) in the ionosphere over Arecibo are calculated and compared with those from observations of the plasma line intensity. This approach involving directly observed quantities avoids the uncertainties that have plagued past comparisons with photoelectron theory. In addition, careful comparisons in physically relevant segments of the spectra show that any significant increase in the magnitude of the solar EUV flux would lead to a contradiction of the observed plasma wave intensities. Further, the comparisons indicate that resolution of the thermal electron‐gas heat balance problem must be sought through better heat transfer rates (e.g., heating and cooling rates, etc.), rather than in the solar EUV. This approach utilizes more fully the potential of the plasma line experiment as a diagnostic tool for aeronomical studies, (e.g., photoelectrons, auroral secondaries, ionosphere‐modification experiments, etc.)

«Ἄνθρωπος ἐν τιμῇ ὢν οὐ συνῆκε». Zu zwei Miniaturen des 48. Psalms

Η εικονογράφηση δύο στίχων του ψαλμού ΜΗ σε δύο διαφορετικές περιπτώσεις, του 21ου στίχου στο ψαλτήρι του Θεοδώρου του 1066 και του 13ου στίχου του στο ψαλτήρι του Κιέβου του 1397 με την ίδια παράσταση, όπου μια ανδρική μορφή ραβδίζει ένα δέντρο και οι καρποί που πέφτουν τρώγονται από τους χοίρους, παρουσιάζει ξεχωριστό ενδιαφέρον. Σύμφωνα και με άλλα εικαστικά στοιχεία η παράσταση θα πρέπει να ταυτιστεί με την εικονογράφηση της παραβολής του Ασώτου, όπου διαλαμβάνεται η εργασία του ως χοιροβοσκού. Τόσο οι πατερικές ερμηνείες του ευαγγελικού κειμένου, όσο και τα εξηγητικά σχόλια του ψαλμού ΜΗ αναφέρονται στην απώλεια της ανθρώπινης αξιοπρέπειας και στην εξομοίωση του ανθρώπου με τα ζώα. Με τους ίδιους συσχετισμούς θα πρέπει να ερμηνευθεί και η παράσταση του Ασώτου ως χοιροβοσκού.«’Ἅνθρωπος ἐν τιμῆ ὤν οὐ συνῆκε’; Two miniatures on the 48th Psalm»Αγγλική περίληψη: The illustration of two verses of the Psalm 48 in two different cases, the 21st verse in the Psalter of Theodore of the year 1066 and of the 13th verse in the Psalter of Kiev of the year 1397, with the same scene where a man beats a tree and the beans that fall are being eaten by the pigs presents special interest. According to other pictorial data the scene should be identified to that of the Prodigal son where it is cited that he worked as a swineherd. The patristic interpretation on the evangelic text as well as the exegetic comments on the Psalm 48 all refer to the loss of the human dignity and to the man’s equation to the animals. The same correlations should also be understood in the representation of the Prodigal son as a swineherd.

A new framework architecture for next generation e-Health services

The challenge for fast and low-cost deployment of ubiquitous personalized e-Health services has prompted us to propose a new framework architecture for such services. We have studied the operational features and the environment of e-Health services and we led to a framework structure that extends the ETSI/Parlay architecture, which is used for the deployment of standardized services over the next generation IP networks. We expanded the ETSI/Parlay architecture with new service capability features as well as sensor, profiling and security mechanisms. The proposed framework assists the seamless integration, within the e-Health service structure, of diverse facilities provided by both the underlying communication and computing infrastructure as well as the patient's bio and context sensor networks. Finally, we demonstrate the deployment of a tele-monitoring service in smart home environment based on the proposed framework architecture