2. Ερευνητικές δημοσιεύσεις | Research publications

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https://hdl.handle.net/10889/2147

Η συλλογή αυτή συγκεντρώνει τις δημοσιεύσεις του διδακτικού και ερευνητικού προσωπικού του Πανεπιστημίου Πατρών σε επιστημονικά περιοδικά ή σε επιστημονικές εκδηλώσεις (συνέδρια, ημερίδες, κλπ.).

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Open Access
A class of surface-independent integrals in three-dimensional elasticity with an application to locating planar cracks
(Martinus Nijhoff Publishers, 1987-03) Ioakimidis, Nikolaos
Γενικό Τμήμα (Δημοσ. Π.Π. σε περιοδικά)
Path-independent integrals have found a wide range of applications in two-dimensional isotropic elasticity particularly in crack problems appearing in fracture mechanics. Similarly, in three-dimensional elasticity, surface-independent integrals have also been studied. Here it is taken into account that every problem in three-dimensional isotropic elasticity can be completely solved on the basis of four (and, quite frequently, only three) harmonic potentials. Two integral identities on a closed surface S inside a three-dimensional isotropic elastic medium, which are direct consequences of the Green identities of real three-dimensional calculus, can be directly used with the aforementioned harmonic potentials of three-dimensional isotropic elasticity. In this way, an infinity of surface-independent integrals in three-dimensional isotropic elasticity can be directly derived. As an application to fracture mechanics a planar crack C lying on the Oxy-plane and under symmetric normal loading conditions is studied with the help of the related Boussinesq–Papkovich harmonic potential G(x, y, z), which is based on the crack opening displacement. With the help of this potential and related surface-independent integrals on an appropriate surface S useful information can be gathered with respect to the planar crack C. For example, for a small crack C its approximate location on the Oxy-plane can be determined. The application of the present results to the penny-shaped crack is trivial. Generalizations of the same approach are also possible.
Open Access
A genre-based framework for constructing multimodal content for learning objects
Vorvilas, George; Karalis, Thanassis; Ravanis, Konstantinos; Βορβυλάς, Γεώργιος; Καραλής, Θανάσης; Ραβάνης, Κωνσταντίνος
Τμήμα Επιστημών της Εκπαίδευσης και της Αγωγής στην Προσχολική Ηλικία (Δημοσ. Π.Π. σε περιοδικά)
In the present article we propose a genre-based conceptual framework for designing content for learning objects. We review some content aggregation models in order to stress the lack of such an approach. We also consider learning objects as multimodal macrogenres. These macrogenres are constituted of content object assemblies. The successful and coherent aggregation of these content objects can be achieved through the recognition of potential rhetorical relations among them. Finally, adopting this framework, an author/teacher is supported with a repertoire of concepts that make him capable of affect and motivate students in particular ways through her intended learning materials.
Open Access
A note on locating straight-crack tips in finite plane elastic media
(Martinus Nijhoff Publishers, 1986-09) Ioakimidis, Nikolaos
Γενικό Τμήμα (Δημοσ. Π.Π. σε περιοδικά)
The method of complex path-independent integrals is an interesting method and practically useful in some problems of plane isotropic elasticity. Here this method is applied to the problem of locating the tips a and b of an unloaded straight crack [a, b] lying inside a finite plane isotropic elastic medium. This is achieved through the generalization of previous related results concerning two simpler cases of this problem. For this task the two complex potentials Phi(z) and Omega(z) of Kolosov–Muskhelishvili are assumed to be known in advance on a closed contour C surrounding the unloaded straight crack [a, b] with C perhaps coinciding with the boundary of the isotropic elastic medium under consideration. Then by using the Cauchy theorem in complex analysis and four appropriate complex path-independent integrals I0, I1, I2 and I3, which are based on the square of the sum of these two complex potentials, we can easily determine the two crack tips a and b of the present straight crack [a, b] in closed form. This is achieved through the derivation and use of two simple equations including the aforementioned four complex path-independent integrals. The present approach appropriately modified is also directly applicable when the closed contour C surrounds only one crack tip (either b or a) and it leads to the location of this particular crack tip. Naturally, in this computationally much simpler case, a second closed contour C* should be similarly used for the location of the other crack tip (now either a or b). Modifications and generalizations of the present approach based on complex path-independent integrals are also possible.
Open Access
A numerical replacement of computer algebra methods for the derivation of polynomial equations in mechanics
(Elsevier Science, 1997-11) Ioakimidis, Nikolaos
Γενικό Τμήμα (Δημοσ. Π.Π. σε περιοδικά)
The classical computer algebra methods of Gröbner bases and characteristic sets have been already used for the derivation of polynomial formulae, mainly in classical geometry. Here we derive analogous formulae in applied mechanics by using a completely different approach: the numerical determination of the coefficients in the required polynomial formulae without the use of computer algebra techniques. Two compatibility equations for the stress components in plane elasticity and the equation of caustics in fracture mechanics are used as the vehicle for the illustration of the present elementary numerical approach. Beyond the simplicity of the present method, its powerfulness consists mainly in the fact that the well-known disadvantages of computer algebra methods (in the required computer memory and, mainly, computer time) are now avoided. Generalizations of the present approach follow easily (e.g. from polynomial to differential equations).
Open Access
A real analytical integral formula for a simple root of a system of two nonlinear equations
(University of Niš, 1986) Ioakimidis, Nikolaos
Γενικό Τμήμα (Δημοσ. Π.Π. σε περιοδικά)
A method for the closed-form solution of two real nonlinear algebraic or transcendental equations, f(x,y) = 0, g(x,y) = 0, possessing one simple root (x0, y0) in a finite domain of the Oxy-plane is proposed. This method is based on the Picard method for the calculation of the number of roots of a system of nonlinear equations or, more explicitly, on the classical Gauss (or divergence) theorem in elementary mathematical analysis. The resulting formulae for x0 and y0 contain integrals including the functions f and g and their first partial derivatives. The present results generalize earlier relevant results for a single nonlinear equation.
Open Access
A theoretical bound for the modulus of the generalized stress intensity factor at an interface crack tip related to the method of caustics
(Kluwer Academic Publishers, 1989-09) Ioakimidis, Nikolaos
Γενικό Τμήμα (Δημοσ. Π.Π. σε περιοδικά)
A theoretical bound is derived for the modulus (or absolute value) of the complex generalized stress intensity factor at a crack tip of an interface crack lying between two isotropic elastic half-planes in plane isotropic elasticity. This bound can be experimentally computed by employing the experimental method of caustics, which is a popular and efficient method for the computation of stress intensity factors at crack tips, but in the present case concerning an interface crack two experiments with appropriately selected overall mechanical–optical constants in the method of caustics are required. The derivation of the formula for the present bound is based on the use of the first complex potential of Kolosov–Muskhelishvili (in its expressions for both half-planes) together with the use of the classical maximum modulus principle in complex analysis. Moreover, the same formula for the bound includes two bielastic constants depending on four elastic constants, more explicitly, on the shear moduli and on the Muskhelishvili constants of the two isotropic elastic half-planes. Evidently, in the special case of just one isotropic elastic medium with a straight crack, the present bound reduces to the simpler bound valid in this special case.
Open Access
A unified Riemann–Hilbert approach to the analytical determination of zeros of sectionally analytic functions
(Academic Press, 1988-01) Ioakimidis, Nikolaos
Γενικό Τμήμα (Δημοσ. Π.Π. σε περιοδικά)
A general method for the analytical determination (through closed-form integral formulae) of the zeros of sectionally analytic functions in the cut complex plane is proposed. This method is based on the application of the theory of the Riemann–Hilbert boundary value problem for sectionally analytic functions and it is a generalization of the existing relevant methods of Burniston and Siewert and of Anastasselou. These methods result here as special cases of the proposed method. As an application a new formula is derived and numerical results are presented for the root of a classical transcendental equation appearing in the theory of ferromagnetism.
Open Access
Air flow characteristics in an industrial wood pallet drying kiln
(2010-07-21T09:52:17Z) Tzempelikos, Dimitrios; Filios, Andronikos; Margaris, Dionisios; Τζεμπελίκος, Δημήτριος; Φίλιος, Ανδρόνικος; Μάργαρης, Διονύσιος
Τμήμα Μηχανολόγων και Αεροναυπηγών Μηχαν. (Δημοσ. Π.Π. σε συνέδρια)
The improvement and optimization of air-distribution systems in drying kilns contributes to the preservation of the quality, safety and shelf life of perishable products. The present study reports on the numerical solution of airflow within a two dimensional drying kiln enclosure loaded with wooden pallets. The performance of air flow field is examined with and without supply of wooden pallets. Different arrangements of the supplied wooden pallets are investigated as well as the use of a screen in order to improve the airflow filed. The steady state RANS equations that formulate the flow problem are solved along with a turbulence model that is the standard k-εor the rng k-ε. The effect of the turbulence modeling is distinguished through direct comparisons of the derived airflow patterns. The results obtained show the presence of stagnant zones inside the pallets columns and above of them and the presence of recirculation regions in different zones of the drying kiln with the two turbulence models.
Open Access
Air flow characteristics in an industrial wood pallet drying kiln
(2013-07-30) Tzempelikos, Dimitrios; Filios, Andronikos; Margaris, Dionissios; Τζεμπελίκος, Δημήτριος; Φιλιός, Ανδρόνικος; Μάργαρης, Διονύσιος
Τμήμα Μηχανολόγων και Αεροναυπηγών Μηχαν. (Δημοσ. Π.Π. σε συνέδρια)
The improvement and optimization of air-distribution systems in drying kilns contributes to the preservation of the quality, safety and shelf life of perishable products. The present study reports on the numerical solution of airflow within a two dimensional drying kiln enclosure loaded with wooden pallets. The performance of air flow field is examined with and without supply of wooden pallets. Different arrangements of the supplied wooden pallets are investigated as well as the use of a screen in order to improve the airflow field. The steady state RANS equations that formulate the flow problem are solved along with a turbulence model that is the standard k-ε or the rng k-ε. The effect of the turbulence modeling is distinguished through direct comparisons of the derived airflow patterns. The results obtained show the presence of stagnant zones inside the pallets columns and above of them and the presence of recirculation regions in different zones of the drying kiln with the two turbulence models.
Open Access
Airflow patterns in a laboratory batch-type, tray air dryer
(2013-07-30) Tzempelikos, Dimitrios; Vouros, Alexandros; Bardakas, Achilleas; Filios, Andronikos; Margaris, Dionissios; Τζεμπελίκος, Δημήτριος; Βούρος, Αλέξανδρος; Μπαρδάκας, Αχιλλέας; Φιλιός, Ανδρόνικος; Μάργαρης, Διονύσιος
Τμήμα Μηχανολόγων και Αεροναυπηγών Μηχαν. (Δημοσ. Π.Π. σε συνέδρια)
The batch-type dryer is one of the most popular equipment for fruit drying. However, the optimization of the air distribution inside the drying chamber remains a very important issue, due to its strong impact on efficient drying and uniformity of moisture content of products. A new scale laboratory batch-type, tray air dryer has been designed, constructed and evaluated for drying several horticultural and agricultural products. The flow field inside the dryer is studied through computational fluid dynamics (CFD). A three-dimensional model for laboratory dryer has been created and the steady state incompressible, Reynolds-Averaged Navier-Stokes (RANS) equations that formulate the flow problem are solved, incorporating standard and RNG k-ε turbulence models. The simulations are conducted for testing chamber average velocity of 2,9 m/s at ambient temperature. The CFD models are evaluated by comparing airflow patterns and velocity distributions to measured data. Numerical simulations and measurements convince that the new scale laboratory batch-type dryer is able to produce a sufficiently uniform air distribution throughout the testing chamber of the dryer.
Open Access
Airway trauma : a review on epidemiology, mechanisms of injury, diagnosis and treatment
Prokakis, Christos; Dedeilias, Panagiotis; Filos, Kriton; Koletsis, Efstratios; Fligou, Foteini; Dougenis, Dimitrios; Προκάκης, Χρήστος; Δεδεήλιας, Παναγιώτης; Φίλος, Κρίτων; Κολέτσης, Ευστράτιος; Φλίγκου, Φωτεινή; Δουγενής, Δημήτρης
Τμήμα Ιατρικής (Δημοσ. Π.Π. σε περιοδικά)
Airway injuries are life threatening conditions. A very little number of patients suffering air injuries are transferred live at the hospital. The diagnosis requires a high index of suspicion based on the presence of non-specific for these injuries symptoms and signs and a thorough knowledge of the mechanisms of injury. Bronchoscopy and chest computed tomography with MPR and 3D reconstruction of the airway represent the procedures of choice for the definitive diagnosis. Endotracheal intubation under bronchoscopic guidance is the key point to gain airway control and appropriate ventilation. Primary repair with direct suture or resection and an end to end anastomosis is the treatment of choice for patients suffering from tracheobronchial injuries (TBI). The surgical approach to the injured airway depends on its location. Selected patients, mainly with iatrogenic injuries, can be treated conservatively as long as the injury is small (<2 cm), a secure and patent airway and adequate ventilation are achieved, and there are no signs of sepsis. Patients with delayed presentation airway injuries should be referred for surgical treatment. Intraoperative evaluation of the viability of the lung parenchyma beyond the site of stenosis/obstruction is mandatory to avoid unnecessary lung resection.
Open Access
Allergic inflammation does not impact chemical-induced carcinogenesis in the lungs of mice
(2011-12-02) Doris, Konstantinos; Karabela, Sophia P; Kairi, Chrysoula; Simoes, Davina CM; Roussos, Charis; Zakynthinos, Spyros G; Kalomenidis, Ioannis; Blackwell, Timothy S; Stathopoulos, Georgios T; Doris, Κωνσταντίνος; Καράμπελα, Σοφία Π; Καΐρη, Χρυσούλα; Simoes, Davina CM; Ρούσσος, Χάρης; Ζακυνθινός, Σπύρος Γ; Καλομενίδης, Ιωάννης; Blackwell, Timothy S; Σταθόπουλος, Γεώργιος Τ
Τμήμα Ιατρικής (Δημοσ. Π.Π. σε περιοδικά)
Although the relationship between allergic inflammation and lung carcinogenesis is not clearly defined, several reports suggest an increased incidence of lung cancer in patients with asthma. We aimed at determining the functional impact of allergic inflammation on chemical carcinogenesis in the lungs of mice. Methods Balb/c mice received single-dose urethane (1 g/kg at day 0) and two-stage ovalbumin during tumor initiation (sensitization: days -14 and 0; challenge: daily at days 6-12), tumor progression (sensitization: days 70 and 84; challenge: daily at days 90-96), or chronically (sensitization: days -14 and 0; challenge: daily at days 6-12 and thrice weekly thereafter). In addition, interleukin (IL)-5 deficient and wild-type C57BL/6 mice received ten weekly urethane injections. All mice were sacrificed after four months. Primary end-points were number, size, and histology of lung tumors. Secondary end-points were inflammatory cells and mediators in the airspace compartment. Results Ovalbumin provoked acute allergic inflammation and chronic remodeling of murine airways, evident by airspace eosinophilia, IL-5 up-regulation, and airspace enlargement. Urethane resulted in formation of atypical alveolar hyperplasias, adenomas, and adenocarcinomas in mouse lungs. Ovalbumin-induced allergic inflammation during tumor initiation, progression, or continuously did not impact the number, size, or histologic distribution of urethane-induced pulmonary neoplastic lesions. In addition, genetic deficiency in IL-5 had no effect on urethane-induced lung tumorigenesis. Conclusions Allergic inflammation does not impact chemical-induced carcinogenesis of the airways. These findings suggest that not all types of airway inflammation influence lung carcinogenesis and cast doubt on the idea of a mechanistic link between asthma and lung cancer.
Open Access
An Aegean History and Archaeology Written through Radiocarbon Dates
(Ubiquity Press, ) Katsianis, Markos; Bevan, Andrew; Styliaras, Giorgos; Maniatis, Yannis; Κατσιάνης, Μάρκος; Στυλιάρας, Γεώργιος; Μανιάτης, Γιάννης
Τμήμα Ιστορίας - Αρχαιολογίας (Δημοσ. Π.Π. σε περιοδικά)
This dataset is the outcome of an INSTAP-funded project “An Aegean Prehistory Written in Radiocarbon Dates”. It includes 3159 14C dates from 353 sites in Greece and reflects an attempt to exhaustively collect and cross-check all published radiocarbon dates from existing databases, original publications and preliminary reports using both international and Greek sources (376 sources in total). Although originally targeting prehistoric dates, all dates coming from archaeological or environmental sampling were integrated in the final dataset regardless of chronological period. Sites have been identified and positioned as accurately as possible, while additional information on sampling procedures, sample material and stratigraphic context have been recorded.
Open Access
An experimental study on convective drying of quince
(2013-08-06) Tzempelikos, Dimitrios; Bardakas, Achilleas; Vouros, Alexandros; Tsepenekas, Dionysios; Filios, Andronikos; Margaris, Dionissios; Τζεμπελίκος, Δημήτριος; Μπαρδάκας, Αχιλλέας; Βούρος, Αλέξανδρος; Τσεπενέκας, Διονύσιος; Φιλιός, Ανδρόνικος; Μάργαρης, Διονύσιος
Τμήμα Μηχανολόγων και Αεροναυπηγών Μηχαν. (Δημοσ. Π.Π. σε συνέδρια)
A laboratory convective drying unit (LCDU) has been designed, constructed and equipped with an integrated measurement and control instrumentation, in order to evaluate the essential drying characteristics of various horticultural and agricultural products. The current paper presents experimental results from tests with quince slices. Drying kinetics was investigated as a function of drying conditions. Experiments were conducted at air flow temperatures of 40, 50 and 60oC and average velocities of 1, 2 and 3 m/s. Temperature changes of the drying quince samples, the relative humidity and the temperature of the drying air were measured during the drying processes and finally the moisture ratio (MR) was calculated. The experimental MR data were fitted with three mathematical models available in the literature and a good agreement was observed. In the ranges measured, Fick’s 2nd law of diffusion was used to fit the experimental data for the determination of the effective moisture diffusivity. The activation energy was determined, assuming an Arrhenius type temperature relationship with moisture diffusivity.
Open Access
An in vitro study, evaluating the effect of sunitinib and/or lapatinib on two glioma cell lines
(2013-12-03) Giannopoulou, Efstathia; Dimitropoulos, Konstantinos; Argyriou, Andreas; Koutras, Angelos; Dimitrakopoulos, Fotinos; Kalofonos, Haralabos; Γιαννοπούλου, Ευσταθία; Δημητρόπουλος, Κωνσταντίνος; Αργυρίου, Ανδρέας; Κούτρας, Άγγελος; Δημητρακόπουλος, Φωτεινός; Καλόφωνος, Χαράλαμπος
Τμήμα Ιατρικής (Δημοσ. Π.Π. σε περιοδικά)
Aim: We sought to assess the effect of sunitinib and lapatinib applied either alone or in combination, on U87 and M059K glioma cells. Methods: Both cell lines were cultured as recommended by the manufacturer. Sunitinib and lapatinib were applied, either separately or in combination, in the cultured cells after cell attachment at doses of 10nM, 100nM, 1μM and 10 μM. To determine whether the agents affect the proliferation of glioma cells, the 3-[4,5-dimethylthiazol-2-yl]-2,5 dimethyltetrazolium bromide assay was used. Apoptosis was detected using annexin V/propidium iodide detection assay, migration assay was performed in 24-well microchemotaxis chambers. The release of MMPs into the culture medium of U87 and M059K cells was measured by zymography. Results: Both agents, administered either alone or in combination, decreased cell proliferation in a dose-dependent manner 48 h after their application in both cell lines. The inhibition of their combination was statistically different than the inhibition of each agent alone. Apoptosis was increased and migration of U87 and M059K cells was inhibited either by each agent alone or their combination. MMPs levels remained unaffected by the application of both agents in U87 cells. However, MMP-9 and MMP-2 levels were decreased 48h after treatment of M059K cells with sunitinib either alone or in combination with lapatinib. Conclusion: Sunitinib and/or lapatinib appear to exhibit significant effects on proliferation, apoptosis and migration of glioma cells. When applied alone, sunitinib appears to be a more potent inhibitor than lapatinib.
Open Access
An optical coherence tomography study of two new generation stents with 2 biodegradable polymer carrier, eluting paclitaxel vs. biolimus-A9
Davlouros, Periklis; Mavronasiou, Eleni; Xanthopoulou, Ioanna; Karantalis, Vasileios; Tsigkas, Grigorios; Hahalis, George; Alexopoulos, Dimitrios; Δαβλούρος, Περικλής; Μαυρονάσιου, Ελένη; Καρανταλής, Βασίλειος; Τσίγκας, Γρηγόριος; Χαλάλης, Γεώργιος; Ξανθοπούλου, Ιωάννα; Αλεξόπουλος, Δημήτριος
Τμήμα Ιατρικής (Δημοσ. Π.Π. σε περιοδικά)
Background: Tissue coverage and strut apposition of drug eluting stents (DES), which can be assessed with 21 optical coherence tomography (OCT), may be associated with late stent thrombosis (LST). 22 Methods: Prospective observational angiographic and OCT follow-up at 6 months post-implantation of a 23 biolimus-A9 eluting stent (BES) vs. a paclitaxel eluting stent (PES), with biodegradable polymer carriers. The 24 primary outcome was the percent difference of uncovered struts between BESs and PESs. 25 Results: A maximum likelihood model was used for analysis, to account for data clustering. Sixteen patients 26 were treated with BES (28 lesions/4530 struts) and 16 with PES (23 lesions/4450 struts). Overall, BESs 27 compared to PESs had more uncovered [0.41% vs. 0.21%, difference estimate (DE) 0.2 (95% CI, 0.06–0.34), 28 p=0.006], malapposed [0.18% vs. 0.04%, DE 0.14 (95% CI 0.05–0.23), p=0.003], uncovered and malapposed 29 [0.08% vs. 0.026%, DE 0.057 (95% CI 0.015–0.1), p=0.01] and protruding struts [0.23% vs. 0.04%, DE 0.185 (95% 30 CI 0.1–0.27), pb0.001], and significantly lower neointimal thickness (59.3± 28.2 μm vs. 201.7± 97.5, 31 pb0.001). None of the BESs was totally covered with neointima, in contrast to 5 (21.7%) PESs (p=0.01). 32 Thrombus was detected in 1 (3.6%) BES and 5 (21.7%) PESs (p=0.05); however, no patient experienced 33 clinical stent thrombosis. 34 Conclusion: Between two stents with biodegradable polymer, OCT demonstrated that BESs had more 35 uncovered and malapposed struts compared to PESs at 6 months. This difference might be partly attributed to 36 the more potent antiproliferative properties of biolimus-A9; however, its impact on clinical outcome and on 37 the risk of LST is yet to be determined.
Open Access
Analysis of air velocity distribution in a laboratory batch-type tray air dryer by computational fluid dynamics
(2013-03-12) Tzempelikos, Dimitrios; Vouros, Alexandros; Bardakas, Achilleas; Filios, Andronikos; Margaris, Dionissios; Τζεμπελίκος, Δημήτριος; Βούρος, Αλέξανδρος; Μπαρδάκας, Αχιλλέας; Φιλιός, Ανδρόνικος; Μάργαρης, Διονύσιος
Τμήμα Μηχανολόγων και Αεροναυπηγών Μηχαν. (Δημοσ. Π.Π. σε περιοδικά)
Batch dryers are some of the most widespread equipment used for fruit dehydration. Nevertheless, the optimization of the air distribution inside the drying chamber of a batch dryer remains a very important point, due to its strong effect on drying efficiency as well as the uniformity of the moisture content of the drying products. A new scale laboratory batch-type tray air (BTA) dryer was designed, constructed and evaluated for the drying of several horticultural and agricultural products. The airflow field inside the dryer was studied through a commercial computational fluid dynamics (CFD) package. A three-dimensional model for a laboratory BTA dryer was created and the steady-state incompressible, Reynolds-Averaged Navier-Stokes equations that formulate the flow problem were solved, incorporating standard and RNG k-ε turbulence models. In the simulation, the tray, used inside the BTA drying chamber, was modeled as a thin porous media of finite thickness. The simulations for testing the chamber were conducted at an average velocity of 2.9 m/s at ambient temperature. The CFD models were evaluated by comparing the airflow patterns and velocity distributions to the measured data. Numerical simulations and measurements showed that the new scale laboratory BTA dryer is able to produce a sufficiently uniform air distribution throughout the testing chamber of the dryer.
Open Access
Analysis of bone composition with Raman spectroscopy
(2012-05-04) Kontoyannis, Christos; Orkoula, Malvina; Kalonakis, Konstantinos; Κοντογιάννης, Χρήστος; Όρκουλα, Μαλβίνα; Καλονάκης, Κωνσταντίνος
Τμήμα Φαρμακευτικής (Δημοσ. Π.Π. σε συνέδρια)
Bone is a composite material formed by the nucleation and growth of a mineral highly resembling calcium hydroxyapatite, Ca10(PO4)6(OH)2, within an organic matrix consisting mainly of type I collagen. Seventy percent of mature bone consists of the inorganic phase while the organic matrix and water fills the rest. Development of fast and reliable methodologies capable of analyzing chemically the major bone constituents is needed. In the present work, Raman spectroscopy, a non-destructive technique, was applied as such a tool on bovine cortical and trabecular parts of bone. Preliminary results show that their mineral to organic ratio differs at 30%.
Open Access
Analysis of the early Minoan IB pottery with scanning electron microscopy
(INSTAP Academic Press, ) Iliopoulos, Ioannis; Ηλιόπουλος, Ιωάννης
Τμήμα Γεωλογίας (Δημοσ. Π.Π. σε βιβλία)
An in-depth technological study which examines the chemical composition and firing temperature of the different wares from the ceramic assemblage of the Prepalatial EM IB cemetery at Gournes, Crete, Greece, through scanning electron microscopy (SEM/EDS).
Open Access
Ancient question-and-answer literature and its role in the tradition of dialogue
(De Gruyter (Beiträge zur Altertumskunde 315), ) Οικονομοπούλου, Κατερίνα; Föllinger, Sabine; Müller, Gernot Michael; Oikonomopoulou, Katerina
Τμήμα Φιλολογίας (Δημοσ. Π.Π. σε βιβλία)
Το κεφάλαιο εξετάζει τη σύνδεση της αρχαίας λογοτεχνίας των ερωταποκρίσεων με την παράδοση του διαλόγου.