bluuebunny/crossref_metadata_2025 huggingface dataset:
Healthy Canadian adolescents’ perspectives of cancer using metaphors: a qualitative study
Authors: Woodgate Roberta Lynn , Busolo David Shiyokha
Published: January 2017

Objectives

Cancer has been described using metaphors for over 4 decades. However, little is known about healthy adolescents’ perspectives of cancer using metaphors. This paper reports on findings specific to adolescents’ perspectives of cancer using metaphors. The findings emerged from a qualitative ethnographic study that sought to understand Canadian adolescents’ conceptualisation of cancer and cancer prevention.

Design

To arrive at a detailed description, data were obtained using individual interviews, focus groups and photovoice.

Setting

6 high schools from a western Canada province.

Participants

75 Canadian adolescents.

Results

Use of 4 metaphors emerged from the data: loss (cancer as the sick patient and cancer as death itself); military (cancer as a battle); living thing (haywire cells and other living things) and faith (cancer as God's will) metaphors, with the loss and military metaphors being the ones most frequently used by adolescents. Adolescents’ descriptions of cancer were partly informed by their experiences with family members with cancer but also what occurs in their social worlds including mass media. Adolescents related cancer to emotions such as sadness and fear. Accordingly, more holistic and factual cancer descriptions, education and psychosocial support are needed to direct cancer messaging and clinical practice.

Conclusions

Findings from this study suggest that the public and healthcare providers be more aware of how they communicate cancer messages.
Cladoceran diversity dynamics in lakes from a northern mining region: responses to multiple stressors characterized by alpha and beta diversity
Authors: Winegardner Amanda K. , Salter Natasha , Aebischer Stéphane , Pienitz Reinhard , Derry Alison M. , Wing Boswell , Beisner Beatrix E. , Gregory-Eaves Irene
Published: January 2017

The lakes surrounding the iron ore mining region of Schefferville, Quebec, Canada, sit within a landscape of historical disturbances, two of which have been relatively well documented over time: metal contamination and nutrient loading. Based on the analysis of sediment cores, we used cladoceran zooplankton subfossil assemblages from two lakes located in Schefferville to track both alpha and beta diversity over the last 100+ years. We showed that high metal concentrations were correlated with decreased cladoceran diversity, and that the site that experienced both direct wastewater input and atmospheric metal loading (Lake Dauriat) had the greatest declines in cladoceran richness. In both lakes, turnover in cladoceran assemblages was highest in the mining period. During the period of mine closures and improvement of wastewater treatment, some decreases in metal enrichment in the sediments and increases in cladoceran richness were observed in Lake Dauriat. Overall, a combined use of species richness and beta diversity metrics showed alpha and beta diversity are not always congruent, and that there are various ways to interpret scenarios of temporal beta diversity in northern freshwater systems.
Pre-Clinical Study on the Detection of Simulated Epileptic Seizures
Authors: Vergara Paula , Villar José R. , La Cal Enrique De , Menéndez Manuel , Sedano Javier
Published: January 2017

Wearable devices have promoted the application of Human Activity Recognition to the development of techniques for the assessment or diagnosing of illnesses and seizures, among other applications. For instance, the use of tri-axial accelerometry (3DACM) to detect abnormal and sudden movements has been introduced in the epileptic seizure recognition. In a previous research, Fuzzy Rule Based Classifiers (FRBC) have been found valid for the detection of epileptic convulsions; however, Ant Colony Systems learned FRBC performed with a high variability depending on the training data. In this study, we cope with this problem by the selection of a suitable partitioning method that has been extended to generate Fuzzy partitions. The comparison with the previous obtained results shows the fuzzy partitioning does not improve the overall performance in terms of error but highly reduces the variability in the performance of the obtained models, which allows us to obtain general models.
Nonlinear properties of unfilled d shell metal porphyrins of 5,10,15,20-tetraphenyl-21H, 23H-porphine cobalt(II) et 5,10,15,20-tetrakis(4-methoxyphenyl)-21H, 23H-porphine cobalt(II) using D4 σ-Z-scan
Authors: Chniti Meherzia , Cassagne Christophe , Wang Hongzhen , Boudebs Georges
Published: January 2017

We study the nonlinear (NL) absorption and refraction of 5,10,15,20-tetraphenyl-21H, 23H-porphin cobalt(II) (CoTPP) and 5,10,15,20-tetrakis(4-methoxyphenyl)-21H, 23H-porphin cobalt(II) (MCoTPP). The measurements were carried out in solutions prepared with chlorobenzene applying the D4[Formula: see text]-Z-scan technique with a laser delivering single pulses in the picosecond regime at 532[Formula: see text]nm. For each compounds, the NL coefficients were measured for three concentrations. The results show that these materials with unfilled [Formula: see text] shell exhibit a saturable absorption (SA), where they have been compared to the basic structure tetraphenylporphyrin (TPP) and zinc tetraphenylporphyrin (ZnTPP) with filled [Formula: see text] shell metal in order to see the influence of the central metal ion on the NL absorption (NLA) behavior.
Shape Potential Effects on Transport and Diffusion Phenomena
Authors: Mbemmo A. M. Fopossi , Kenmoé G. Djuidjé , Kofané T. C.
Published: January 2017

We investigate the diffusion of a particle subjected to a non-sinusoidal periodic potential and driven by an external constant force. To study the dynamic of the Brownian particles, we modify the shape of the potential as well as the temperature. This allows us to observe the dependence of the mean square displacement on the shape parameter as well as the diffusion coefficient. For a particular set of the system parameters, the dispersionless transport, normal diffusion and hyperdiffusion are generated in the system. We show that there exists a potential shape where some parameters of the system weakly affect the type of diffusion. The diffusion coefficient reaches its maximum around a critical value of the external field. This pronounced peak of the diffusion coefficient depends on the shape of the potential, so we have evaluated the critical force as a function of the potential features.
Insulin-Mediated Signaling Facilitates Resistance to PDGFR Inhibition in Proneural hPDGFB-Driven Gliomas
Authors: Almiron Bonnin Damian A. , Ran Cong , Havrda Matthew C. , Liu Huan , Hitoshi Yasuyuki , Zhang Zhonghua , Cheng Chao , Ung Matthew , Israel Mark A.
Published: January 2017

Despite abundant evidence implicating receptor tyrosine kinases (RTK), including the platelet-derived growth factor receptor (PDGFR), in the pathogenesis of glioblastoma (GBM), the clinical use of RTK inhibitors in this disease has been greatly compromised by the rapid emergence of therapeutic resistance. To study the resistance of proneural gliomas that are driven by a PDGFR-regulated pathway to targeted tyrosine kinase inhibitors, we utilized a mouse model of proneural glioma in which mice develop tumors that become resistant to PDGFR inhibition. We found that tumors resistant to PDGFR inhibition required the expression and activation of the insulin receptor (IR)/insulin growth-like factor receptor (IGF1R) for tumor cell proliferation and survival. Cotargeting IR/IGF1R and PDGFR decreased the emergence of resistant clones in vitro. Our findings characterize a novel model of glioma recurrence that implicates the IR/IGF1R signaling axis in mediating the development of resistance to PDGFR inhibition and provide evidence that IR/IGF1R signaling is important in the recurrence of the proneural subtype of glioma in which PDGF/PDGFR is most commonly expressed at a high level. Mol Cancer Ther; 16(4); 705–16. ©2017 AACR.
Culicoides Latreille biting midges (Diptera: Ceratopogonidae) of the Dongzhaigang mangrove forest, Hainan Province, China
Authors: LI JIA-HUI , GOPURENKO DAVID , CAI DU-CHENG , YANG YE-MENG , HU RONG , THEPPARAT ARUNRAT , WARDHANA APRIL H. , KIM HEUNG-CHUL , KLEIN TERRY A. , KIM MYUNG-SOON , BELLIS GLENN A.
Published: January 2017

The biting midge fauna of Dongzhaigang Mangrove Forest, Hainan Province, China was sampled on 14 October 2015 using three methods: a pan light trap operated from dusk until dawn the following morning and sweep net and human landing collections performed between 16:15–17:15 hr. Eight species, including two new records for China, Culicoides palawanensis and C. niphanae, and one new record for Hainan, C. circumbasalis, were collected. A key to assist with identification of specimens of these species is provided. DNA barcodes supported the morphological identification of some of these species and identified the potential presence of cryptic species and/or deep population structure in others. The newly recorded species were morphologically similar to species previously reported from Hainan, highlighting the need for further investigation into the taxonomy of biting midges in this region. Species composition and abundance varied considerably between the three collection techniques suggesting that multiple techniques likely provide a more comprehensive sample of biting midge fauna.
The fruit flies (Diptera: Tephritidae) described by Theodor Becker from Iran and Western China revisited in the collections of the Zoological Institute, Saint-Petersburg and Museum für Naturkunde, Berlin
Authors: KORNEYEV SEVERYN V. , KORNEYEV VALERY A.
Published: January 2017

The type specimens of fruit flies described by Dr. Theodor Becker based on material collected in China (Xinjiang and Xizang) and Iran by Russian expeditions directed by Petr Kozlov and Mykola Zarudny are listed and figured. They are deposited in the collection of the Zoological Institute of Russian Academy of Sciences, Saint Petersburg with some duplicates in the Museum für Naturkunde, Berlin. Current concepts of the species, their morphological characters (illustrated by photographs of type specimens), current condition, and nomenclature are discussed.
Student Zone
Authors: Sharma Sundeep
Published: January 2017

It was beautiful and sunny in Dallas, Texas, the morning of 15 October 2016. Students, with enthusiastic smiles and filled with curiosity, began to occupy a vast ballroom of a downtown hotel. As the number of students grew, the friendly chitchat among them reached a higher decibel level. A total of 51 students from 25 different countries filled the ballroom, and the stage was set for the SEG/Chevron Student Leadership Symposium (SLS), designed to prepare student leaders in the industry to tackle a variety of challenges and motivate their peers.
Impact of Earthquake Types and Aftershocks on Loss Assessment of Non-Code-Conforming Buildings: Case Study with Victoria, British Columbia
Authors: Tesfamariam Solomon , Goda Katsuichiro
Published: January 2017

This paper presents a study on the impact of earthquake types (shallow crustal, deep inslab, and megathrust Cascadia interface earthquakes) and aftershocks on loss assessment of non-code-conforming reinforced concrete (RC) buildings. The loss assessment is formulated within the performance-based earthquake engineering framework. The dependency between the maximum and residual inter-story drift ratios are captured using copulas. Finite-element models that take into account key hysteretic characteristics of non-ductile RC frames were adopted and incremental dynamic analysis is utilized to compute collapse risk. The proposed procedure is applied to a set of 2-, 4-, 8-, and 12-story non-ductile reinforced concrete frames located in Victoria, British Columbia, Canada. From the results, the aftershock showed marked difference for the 2-story building. At annual probability of 10−2–10−3, crustal and inslab events with Mw6.5 to Mw7.5 contributed the most to the loss as these events occur more frequently. At rarer annual probability of 10−3–10−4, the Cascadia event having Mw8.5 to Mw9.0 is predominant and contributed the most to the loss.
Early-Middle Miocene from Kotaphi hill section (Nicosia, Cyprus): preliminary biostratigraphy and paleoceanographic implications
Authors: Athanasiou M. , Triantaphyllou M. , Dimiza M. , Gogou A. , Bouloubassi I. , Tsiolakis E. , Theodorou G.
Published: January 2017

Calcareous nannofossil biostratigraphy from Kotaphi Hill section allowed not only the biostratigraphic zonation of the Miocene units but also provided evidence for a distinct warm phase known as the Middle Miocene Climate Optimum (MMCO). Kotaphi Hill section is located in Agrokipia village (Nicosia region, Cyprus) and consists of cyclic marine deposits of the Pakhna Formation. High resolution sampling has been conducted and 84 samples were collected. Preliminary results indicated that several important calcareous nannofossil events can be consistently recognized along the studied section. High abundances of Discoaster druggii and Highest occurrence (HO) of Sphenolithus procerus suggest the presence of NN2 biozone while, LO of Sphenolithus belemnos has been used to recognize the base of biozone NN3. Upwards, Lowest Common Occurrence (LCO) of Sphenolithus heteromorphus marked the NN3-4 boundary-level. Biozone NN4 in Kotaphi Hill section is featured by high abundance of S. heteromorphus whereas total absence of the species together with the LO of Helicosphaera walbedorfensis mark the Paracme Beginning (PB) of S. heteromorphus interval. High abundance of warm indicators such as Discoasterids, S. heteromorphus, S. moriformis and Helicosphaera carteri observed in our material may partly reflect the warm phase of MMCO. Key words: Agrokipia village, Pakhna Formation, Cyprus, Sphenolithus heteromorphus, Middle Miocene Climate Optimum.
Automatic moment tensor determination for the Hellenic Unified Seismic Network.
Authors: Triantafyllis N. , Sokos E. , Ilias A.
Published: January 2017

Modern seismic networks with broadband sensors and real time digital telemetry made Moment Tensor (MT) determination a routine procedure. Automatic MT’s are now provided by global networks and a few very dense regional networks, within minutes after a significant event. An automatic MT determination wasn’t possible for the broader Hellenic area since seismic station density wasn’t sufficient. The creation of the Hellenic Unified Seismic Network (HUSN) provided the opportunity to apply an automated MT procedure using the available broad band data from almost    one hundred stations. Thus the ISOLA code was extended towards the automatic operation based on Linux OS shell scripts, stand alone Fortran codes and SAC2000. Software supports both manual and automatic mode; at the first case, the user manually runs the program with the desired input parameters while at the latter, the system monitors a mailbox or RSS feed and if it receives an appropriate notification triggers the MT inversion procedure based on certain conditions. As it is setup now it calculates automatically the moment tensor of earthquakes larger than 3.5M  w using data from HUSN. Application of an automated MT inversion procedure for HUSN will provide important real time information for studies like ground motion evaluation, tsunami warning etc.
Late Quaternary palaeoenvironmental changes in the Aegean Sea: interrelations and interactions between North and South Aegean Sea.
Authors: Kontakiotis G. , Antonarakou A. , Zachariasse W. J.
Published: January 2017

The present study describes the Late Quaternary palaeoenvironmental evolution and the main palaeoceanographic changes of the Aegean Sea reconstructed using planktonic foraminifera. This approach, including Q-mode and R-mode cluster analyses, gives an insight into the relationships between sea surface environmental changes between north and south Aegean, and furthermore serves as a baseline data set for palaeoclimatic and palaeoceanographic reconstructions of the eastern Mediterranean Sea.
Changes in flood mortality during the last 50 years in Greece.
Authors: Diakakis M. , Deligiannakis G.
Published: January 2017

This work focuses on the changes that occur in the circumstances under which flood fatalities occur in Greece. To this aim, this paper develops and studies a database of 189 flood-related deaths, between 1960 and 2010, consisting of variables describing the conditions during the time of each incident. Changes in the number and the spatial distribution of fatalities, together with changes in the conditions, the surrounding  environment  and  the  demographics  of  the  victims  are  investigated.  Results showed that males, youngsters and elderly people presented an overrepresentation among the decedents, although individuals between 20 and 65 showed a significant increase among the victims, especially during the last decades of the study period. Fatal flood events were found to be approximately equally divided between urban and rural environments. However, fatal incidents appear to gradually migrate from urban centers to rural environments. Vehicle-related fatalities showed a gradual increase, whereas pedestrian victims and indoors incidents show an opposite trend. Fatalities per flood event presented a significant decline, although in absolute numbers, flood deaths did not show a respectively important decreasing trend. Among different causes of death drowning was found to be the most common throughout the study period.
Geophysical investigation and its geological interpretation in the frame of an intergrated survey prior to a dam construction in Plati River Valley, Rethymno, Greece.
Authors: Apostolopoulos G. , Pavlaki C. , Perleros V. , Amolochitis G.
Published: January 2017

A geophysical survey using electrical resistivity tomography (ERT) method(25 ERT profiles of 240m total length and 2 ERT profiles of 1000m total length) in the area of Plati River valley gave valuable information regarding the stratigraphy, related to loose sediments, various faces of flysch and limestone, the tectonic status and the detection of areas of thick and extensive sheared siltstone, that geoelectrically is similar to clay,material useful for the core of the future dam. Both branches of river and valley and in greater detail the area near the position of the dam have detected showing the underground in a 2D and 3D manner. The thickness of neogene andflysch exceeds 40m. Alternations of siltstones-sandstones are met in flysch and in places cohesive sandstones are also met without continuation in an extended area. The siltstonelayers due to their shear character present clayey characteristics in respect of their resistivities. In general zones of limestone uplift have not been detected, which may create problems of leakages apart of the dam area where lateral inhomogeneity between flysch and limestone has been detected (probable fault). The various limestone bodies met in flysch or neogene do not have continuation in depth and they are isolated.
Seismic hazard assessment in the Northern Aegean Sea (Greece) through discrete Semi-Markov modeling.
Authors: Pertsinidou C. E. , Tsaklidis G. , Papadimitriou E.
Published: January 2017

Semi-Markov  chains  are  used  for  studying  the  evolution  of  seismicity  in  the Northern Aegean Sea (Greece). Their main difference from the Markov chains is that   they  allow the sojourn times (i.e. the time between successive earthquakes), to follow any arbitrary distribution. It is assumed that the time series of earthquakes that  occurred  in  Northern  Aegean  Sea  form  a  discrete  semi-Markov  chain. The probability law of the sojourn times, is considered to be the geometric distribution or   the   discrete  Weibull  distribution. Firstly,  the  data  are  classified  into  two categories that is, state 1: Magnitude 6.5  -7 and state 2 Magnitude>7, and secondly into three categories , that is    state 1: Magnitude 6.5-6.7, state 2: Magnitude 6.8-7.1 and state 3: Magnitude 7.2-7.4 . This methodology is followed in order to obtain more accurate results and find out whether there exists an impact of the different classification on the results. The parameters of the probability laws of the sojourn times are estimated and the semi-Markov kernels are  evaluated for all the above cases  .  The  semi-Markov  kernels  are  compared and  the   conclusions  are  drawn relatively to future seismic hazard in the area under study.
A Non-Extensive approach in investigating Greek seismicity.
Authors: Michas G. , Papadakis G. , Vallianatos F.
Published: January 2017

In this work the Greek seismicity is being investigated by means of Non-Extensive Statistical Physics [NESP]. NESP is a generalization of Boltzmann-Gibbs statistical physics and has been successfully used for the analysis of a variety of complex dynamic systems, where fractality and long- range interactions are important. We use a non-extensive model that is derived from the first principles to describe thefrequency-magnitude distribution of the Greek seismicity for the period 1976-2009 by using a recent earthquake catalogue for the Hellenic region compiled by Makropoulos et al. (2012). The results indicate that the non-extensive model can describe quite well the observed magnitude distribution for the entire magnitude range. Furthermore, the q parameter of the non-extensive model, along with the bvalue of the Gutenberg-Richter relation, are being estimated for different time windows along the time expansion of the catalogue and the variations of these values are being discussed.
The earthquake intervent time distribution along the Hellenic subduction Zone.
Authors: Papadakis G. , Vallianatos F. , Michas G.
Published: January 2017

The Hellenic Subduction Zone (HSZ) is the most seismically active region in Europe (Becker and Meier, 2010). The evolution of such an active region is characterized by complex phenomenology and is expressed through seismicity. Seismicity temporal patterns remain as one of the most important topics in earth sciences. The Weibull distribution has been used as a recurrence time model for large earthquakes (Rikitake, 1976; Rikitake, 1991). Moreover,Hasumi et al. (2009) used the Weibulllog Weibull distribution for the study of the interoccurrence times of earthquakes in Japan.The dataset formed in this study concerns the seismic belt of the HSZ during the period 1976-2009. We use the external seismic sources of shallow earthquakes in the Aegean and the surrounding area (Papaioannou and Papazachos, 2000) along with the updated and extended earthquake catalogue for Greece and adjacent areas (Makropoulos et al., 2012).The application of the Weibull distribution to the interevent times of the formed dataset is analyzed and discussed.
The web portal of the EUROSEISTEST strong ground motion database.
Authors: Pitilakis K. , Roumelioti Z. , Manakou M. , Raptakis D. , Liakakis K. , Anastasiadis A. , Pitilakis D.
Published: January 2017

Strong motion data that have been recorded during the 20-years of operation of the permanent network of EUROSEISTEST (Mygdonia basin, Northern Greece) have been homogenized and organized in an easily accessible, via the web, database. The EUROSEISTEST web portal and the application server running underneath are based solely on free and open source software (F/OSS; MySQL v5.5; RubyOnRails,SAC, Gnuplot and numerous GNU supporting utilities). Its interface allows the user to easily search strong motion data from approximately 200 events and 26 strong motion stations using event-related, record-related or station-related criteria. Further investigation of the data is possible in a graphical environment which includesplots of processed and unprocessed acceleration waveforms, velocity and displacement time histories, amplitude Fourier and response spectra and spectrograms. A great effort was directed toward the inclusion of accurate and most updated earthquake metadata, as well as a wealth of stations related information such as geotechnicaland geophysical site characterization measurements, subsoil structure and site effects. Acceleration data can be easily downloaded in either SAC or ASCII format, while all stations metadata are also available to download.
Investigating the existence of a "palaeo-foreshore" zone at Molos beach (Kefalos bay, Paros, Greece).
Authors: Poulos S. , Ghionis G. , Petrakis S.
Published: January 2017

The present study investigates the existence of a "palaeo-foreshore zone" at Molos beach  in  or  after  1884  A.D.,  as  defined  in  the  Greek  legislation  (Law  2971/ 19.12.2001). To this end, existing geological and climatological information were gathered, detailed geomorphological mapping was carried out and surficial sediment  samples  were  collected  along  a  shore-normal  transect  extending  from  the backshore  to  the  nearshore  (subaqueous)  zone.  In  addition,  sedimentological /stratigraphical data were obtained from two trenches (1.5 m and 3 m deep) that were excavated on the landward side of the coastal dunes. Topographic maps, aerial photographs and satellite images are used to study the recent changes of the shoreline position. On the basis of the above, it is concluded that the current backshore zone has recently evolved from a shallow lagoonal, to a terrestrial environment. The submerged beach rock formations are at similar water depths (0.3-0.4 m) with those observed in other islands of the Cyclades complex (i.e. Rhenia, Naxos) whose formation has been radio-carbon dated at least 200 years BP, indicating  that the 1884 A.D. shoreline was not landward, but approximately 15 m offshore relative to its present position
Aggregate transport and utilization: ecological footprint and environmental impacts
Authors: Agioutantis Z. , Komnitsas K. , Athousaki A.
Published: January 2017

The Ecological Footprint (EF) measures how much of the biosphere’s annual regenerative capacity is required to renew the natural resources used by a defined population in a given year. In essence, the EF is a resource accounting tool that measures how much biologically productive land and sea is used by a given population or activity, and compares this with the available land and sea.Productive land and sea support population demands for food, fiber, timber, energy, and space for infrastructure. These areas also absorb gaseous emissions (i.e. CO2) generated from human activities.The present paper discusses a methodology that allows the parametric estimation of the EF due to the transport of aggregates to urban areas as a function of tonnage and distance.
Multistage alteration, mineralization and ore–forming fluid properties at the Viper (Sappes) Au–Cu–Ag–Te ore body, W. Thrace, Greece.
Authors: Kilias S.P. , Naden J. , Paktsevanoglou M. , Giampouras M. , Stavropoulou A. , Apeiranthiti D. , Mitsis I. , Koutles Th. , Michael K. , Christidis C.
Published: January 2017

The mineralogy of ore and hydrothermal alteration of the high-sulfidation enargite–Au–Ag–Te Viper (Thrace) orebody, and fluid inclusions, were studied in drillcore samples. The hydrothermal system has evolved through several stages from pre-ore advanced argillic I+vuggy silica alteration, ore-stage advanced argillic II+vuggy silica alteration and silicification that has developed to argillic alteration (sericite)+silicification through pH increase, and a return to acid conditions as crosscutting post-ore advanced argillic alteration III+silicification. Ore is characterized by early barren pyrite I corroded by: (i) enargite–Au± complex Pb–Bi–Cu sulfosalts, tellurides and selenides, coexisting with euhedral quartz, and (ii) zoned pyrite II distinguished by anomalous concentrations of Au, Cu, As, Te, Bi, Pb, Se, within vuggy quartz. High-grade gold ore is also intergrown with late brecciacementing and vein-type epithermal-like banded quartz+ pyrite. These alteration and mineralization observations are consistent with the changing composition, water fugacity, and density of an expanding column of metal-laden magmatic vapor, combined with changes in structural permeability. Part of the enargite─Au─ quartz assemblages have been probably quenched from sulfosalt melt at high─temperatures (>575°C). End product of the enargite–sulfhide–silica crystallization sequence is the formation of high-grade epithermal quartz-gold colloformbanded ore during cooling and/or dilution/mixing down to ~200°C.
Genesis of alpinotype fissure minerals from Thasos Island, Northern Greece - Mineralogy, mineral chemistry and crystallizing environment.
Authors: Voudouris P. , Constantinidou S. , Kati M. , Mavrogonatos C. , Kanellopoulos C. , Volioti E.
Published: January 2017

Alpinotype fissure-minerals in Thasos Island are hosted in gneisses, amphibolites, Mn-rich schists and calc-silicate layers, and marbles of the Carboniferous-Permian Pangeon Unit, which represents the lower tectonostratigraphic unit of the southern Rhodope metamorphic core complex. Alpinotype fissures crosscut metamorphic fabrics and are closely related to the exhumation processes of the core complex during the Oligocene-Miocene. Most mineralized fissures occur close to a major detachment fault, which separates gneisses from marbles and amphibolites. The mineralogy of the alpinotype fissures is closely related to the host rocks: amphibolite-hosted fissures include adularia, albite, quartz, titanite, apatite, actinolite, chlorite, calcite, hematite and rutile. Fissures in para- and orthogneisses- and in metapegmatites are characterized by smoky and clear quartz, adularia, muscovite and hematite. Fissures within spessartite-piemontite schists contain quartz, chlorite, spessartite, hematite, rutile, albite, epidote and traces of zircon. Finally fissures in calc-silicate layers include Mn-grossular, quartz and Mn-clinozoisite. Hydrothermal alteration halos surrounding the fissures may suggest leaching of the wall rocks as a potential mechanism for mineral deposition. Scepter quartz crystals consist of a lower Tessinhabit crystal and several generations of upper prismatic quartz crystals, suggesting several stages of crystallization and changing P-T-x conditions with time. Chlorite geothermometry indicates temperatures of formation in the range between 286 and 366 °C. Tessin habit quartz was deposited from CO2-bearing fluids, probably at the transition from a compressional to an extensional tectonic regime and was later dissolved by meteoric water dominated fluids resulting in the formation of quartz scepters. Oxidizing conditions are indicated by the widespread occurrence of hematite in the mineralization. The studied area represents a unique mineralogical geotope. Its geological-mineralogical heritage should be protected through establishment of a mineralogical-petrological geopark that will also promote sustainable development of the area.
The upgrading amenability of the phosphate deposits of Western Greece
Authors: Pantelaki O. , Bellis G. , Stamboliadis E.
Published: January 2017

In Epirus, Western Greece, there exist extensive low quality phosphate rock deposits. Although phosphate fertilizers are extensively used in agriculture and Greece imports about 200.000 ton/y, of phosphate ore in addition to ready to use phosphate fertilizers, these deposits are not yet exploited.This work examines the possibility to upgrade this type of ore using different methods of mineral processing. The results obtained are poor and unsatisfactory for commercial exploitation. The main reasons are the type of P2O5 bearing mineral and mainly it’s intergrowth with the associated gangue ones.The present work examines the mineralogy and chemistry of the ore, the energy size relationship in crushing using a centrifugal crusher, its behavior in grinding, its behavior to heavy liquid treatment and its floatability using oleic acid as well as dialkyl-orthophosphate collectors. The later were specially prepared for this purpose. Finally the ore was calcined at 950 oC in order to dissociate the existing calcite to CaO, which is subsequently selectively hydrolyzed to give Ca(OH)2 that is finely disseminated in the pulp and can be separated from the coarser phosphate grain.
Stability analysis of construction and demolition waste (CDW) deposits in theabandoned quarry of Profitis Ilias, Kozani, Greece.
Authors: Konstantopoulou G. , Spanou N.
Published: January 2017

Abandoned quarries become favourable sites for uncontrolled waste dumps, causing major safety hazards because of potential mass movements. An old quarry, near the town of Kozani, is filled with 772.000 m3 Construction and Demolition Wastes (CDW), containing a variety of materials (aggregates, wood, metals, plastics, bricks, soil etc.), in a wide range of fragment sizes, from clay to boulders. The size of particles and voids influence the behaviour of the filled slope, affecting both shear strength and drainage characteristics. Major factors that should be considered in a stability analysis for CDW, include waste material and soil cover composition, overall degree of compaction, moisture contented, permeability, pore pressure and shear strength parameters. Shear strength parameters were chosen by bibliographic references based on specialized field tests of similar materials. The analyzed profiles computed slip zones of low thickness and range. Therefore, successive back analysis was conducted to the sites of mapped cracks, aimed to determinate the mechanical properties of the slope during the failure. Since, friction angle and bulk density were retained for back analysis, the cohesion was examined. Although deposits are composed of loose heterogeneous materials, which have not been condensed, cohesion exists owing to the "interlocking" of the varying particle size of materials.
The geotectonic evolution of Olympus Mt and its mythological analogue
Authors: Mariolakos I.D. , Manoutsoglou Ε.
Published: January 2017

Mt Olympus is the highest mountain of Greece (2918 m.) and one of the most important and well known locations of the modern world. This is related to its great cultural significance, since the ancient Greeks considered this mountain as the habitat of their Gods, ever since Zeus became the dominant figure of the ancient Greek religion and consequently the protagonist of the cultural regime. Before the generation of Zeus, Olympus was inhabited by the generation of Cronus. In this paper we shall refer to a lesser known mythological reference which, in our opinion, presents similarities to the geotectonic evolution of the wider area of Olympus. According to Apollodorus and other great authors, the God Poseidon and Iphimedia had twin sons, the Aloades, namely Otus and Ephialtes, who showed a tendency to gigantism. When they reached the age of nine, they were about 16 m. tall and 4.5 m. wide. Having then realized their powers, because of their gigantic proportions, they decided to climb Olympus and fight the Gods, exile Zeus and the others, and wed two Goddesses. Otus was to marry Hera and Ephialtes Artemis. But they did not know how to climb such a high mountain, so they decided to construct a “ladder”, by putting mount Ossa on top of mount Olympus and mount Pelion on top of Ossa. This description coincides with the geological and tectonic evolution of the wider Olympus area. But, these complex tectonic processes were completed about 8 – 10 m.a., i.e. millions of years before the appearance of humans, therefore it is impossible that these morphotectonic processes were witnessed by man, so the similarities between the myth of Aloades and the tectonic evolution of the area must be purely coincidental. But are they, or is there more here?
Simulation of underground coal gasification process in a Bulgarian coal field
Authors: Koukouzas N. , Katsimpardi I. , Merachev D.
Published: January 2017

The sustainable and environmentally friendly energy production has been a major issue of the world energy sector in recent years. Coal is a major fossil fuel that provides approximately 25% of the total energy demand worldwide; coal reserves still remain significant, although in several cases its exploitation trends to be economically marginal. Underground Coal Gasification (UCG) has been identified as a technology which can bridge the gap between energy production and environmental and financial sustainability. Several UCG trials have taken place, although, there are still questions relative to their safety, performance and applicability. To that direction, modelling can prove to be a very effective and practical tool for the prediction of the project performance and the reduction of the risk involved. UCG is a complex process which incorporates mechanical and chemical processes thus modelling is complex since it demands coupling the aforementioned processes. The current study aims at investigating the applicability of the UCG process in a Bulgarian coal site through 2D modelling. The proposed approach uses FLAC software as a modelling tool and attempts to combine thermal and mechanical effects during the gasification process. Several simulation runs have taken place in an attempt to quantify the effect of the different mechanical and thermal properties of the surrounding rocks to the UCG process, the environmental effects and the stability of the geological formations.
Coseismic surface displacement variability in relation to lithology
Authors: Rondoyanni Th. , Lykoudi E. , Kalogeras E.
Published: January 2017

The variability of coseismic surface displacement along reactivated normal faults in the Aegean region is investigated. Seismotectonic data of past earthquakes associated with ground deformation and surface rupturing have been collected and analysed. Geological maps presenting the displacement at different sites along the fault traces have been compiled, as well as plots illustrating the corresponding relation between displacement and lithology. The main conclusion of this work is the strong correlation between regional lithology and coseismic surface displacement. Along a reactivated fault, the displacement observed in the recent geological formations is at least twice the displacement observed in the geological bedrock. It must be noted that the ratio of maximum to minimum displacement values along a certain active fault could be high as 5:1. Moreover, the potential displacements determined on the basis of existing empirical relationships, correspond to those observed in the bedrock. These findings could be taken into consideration in seismic hazard analysis during urban and engineering design.
Assessment of groundwater pollution in relation to heavy metals of the alluvial aquifer of Thriasion Plain (NW Attica)
Authors: Kyriazis D. , Zagana E. , Stamatis G. , Fillippidis F. , Psomiadis E.
Published: January 2017

In this study the hydrogeological and hydrochemical characteristics of Thriasion Plain are presented focusing mainly on the presence of heavy metals in the alluvial aquifer. Two main aquifer systems exist in the study area: a) the karst aquifer hosted in the karstified carbonate formations, which structure the bedrock and the margins of the alluvial basin and b) the phreatic aquifer within the Quaternary deposits of the Thriasion Plain. Coastal and submarine groundwater discharges show the direct connection of the aquifers with the sea causing intense salinization in both aquifers. The phreatic aquifer is characterized by high levels of TDS (483 – 13,067 mg/l) and correspondingly high degree of hardness (15.7 to 165.7 odH). High concentrations of Na+, Cl-, SO4 2-, NO3 -, NH4 + and PO4 3- reflect the diverse anthropogenic influences on the aquifer. The strong presence of heavy metals, Cd, Cu, Fe, Mn, Ni, Pb, Sr and Zn has been determined in the most of the samples. Their origin is associated with geogenic factors, such as the occurrences of bauxites, oxides derived from the alteration of rocks, especially shischts, organic matter within the Plio-Pleistocene sediments of the region, as well as with intense pressures from anthropogenic activities. In some cases the groundwater is improper not only for human consumption but also for many other uses.
Spatial-temporal analysis, variation and distribution of precipitation in the water district of Central-Eastern Greece
Authors: Lappas I. , Tsioumas I. , Zorapas V.
Published: January 2017

In this study, the spatial and temporal distribution of precipitation in the Water District of Central – Eastern Greece is investigated for the 42-year period (1968 – 2009) by using monthly mean data from 35 rainfall gauges, with adequate spatial coverage. The basic objective is to infer the pattern of spatial variation of rainfall over the study area based on meteorological observations. The accurate estimation of rainfall’s spatial distribution is needed whenever hydrological modelling is undertaken at the watershed scale for model calibration and validation. By using timeseries analysis and geostatistical methods, the regional and seasonal precipitation change and regime of this region during over 40 years is analyzed. However, this input is subject to uncertainty due to the random nature of rainfall. For all stations, uniformity checking and appropriate completion (where needed) took place and it appears that orography plays significant role as far the amount of rainfall is concerned. The results indicate that high variations in regional rainfall estimation occur in the mountainous areas, while the variance decreases in shadow areas in all seasons. The analysis of rainfall showed that there exists a wide variation in the rainfall amounts with variation from 382.4mm to 1397mm with a significantly decreasing trend.
Comparative geochemistry of three urban streams in Athens: Kifissos-Podoniftis-Pikrodafni
Authors: Argyraki A. , Paraskos F. , Marmara M. , Papadopoulou K. , Maglaropoulou A.
Published: January 2017

The geochemistry of three urban streams in Athens was analysed and compared on the basis of major elements and heavy metals content in water and active sediment. The studied streams of Kifissos, Podoniftis and Pikrodafni run through the Athens basin of a total area of 540 km2 but differ with respect to the origin of their headwaters i.e., Parnitha, Penteli and Hymettus mountains. The main aim of the study was to determine the geochemical signature of water and sediment within the Athens hydrological basin and evaluate the effect of natural and anthropogenic environment on these water courses. A total of 56 stream water samples were obtained and analysed for major anions, cations and heavy metals (Mn, Cr, Cu, Zn, Pb) as well as nitrate and phosphate concentrations. Active stream sediments were collected at 22 locations along the streams and were analysed for heavy metals (Pb, Zn, Cu, Mn, Cr, Ni, Cd). Results indicated that rock weathering, rather than atmospheric or pollution influx is the dominant process affecting the major ion geochemistry of stream flow in the urban setting. However, Kifissos and Podoniftis waters had higher nitrate and phosphate concentrations indicating greater influence by anthropogenic activities. In general the quality characteristics of water and sediment in the study area were found to be in a good state regarding the studied parameters.
TEXTURE VERSUS DISTANCE OF TRAVEL OF GRAVELS ON A STREAM BED: A CASE STUDY FROM FOUR STREAMS IN NW PELOPONNESE, GREECE
Authors: Kourkounis S. , Zelilidis A. , Panagiotakopoulou O. , Kontopoulos N.
Published: January 2017

This study concerns the change of lithology, grain size and roundness of gravels with distance downstream in lowland area from four streams which are Krathis, Kerinitis, Meganitis and Finikas. Four types of gravelly clast lithology were collected: limestone, chert, sandstone and conglomerate. In Krathis stream, the absence of variability in lithologic content is due to a short travel. The variability of the arithmetic mean depends on the width of stream channel. The roundness either remains constant or becomes better downstream because of selective transport. In Kerinitis stream, the variability or the invariability in the lithologic content is due to partly or local sample variation, partly to influx of new material, and partly to effects of increase or decrease of other types. The arithmetic mean and roundness either remain constant or are decreased downstream due to the contamination and the short travel. In Meganitis Stream, the lithologic content shows variability, the arithmetic mean absence of downstream fining gravel and the roundness variability or invariability because of the contamination and gravel mining. In Finikas Stream, the lithological content, the arithmetic mean and the roundness show either variability or invariability because of the gravel mining.
THE AURIFEROUS SUBMARINE FANS SANDSTONES OF THE IONIAN ZONE (EPIRUS, GREECE)
Authors: Manoutsoglou E. , Batsalas A. , Stamboliadis E. , Pantelaki O. , Vakalas I. , Zelilidis A.
Published: January 2017

During recent decades many studies have be done on the rocks that developed in the area of Western Greece and especially in Epirus, known in geoscientific literature as Ionian Zone of External Hellenides. These rocks have undergone geological research (basic geological mapping, research for hydrocarbons, metals and inert materials) and exploitation (inert materials). Recently, within the sedimentary succession of the Ionian zone submarine fans, in the region of Peta–Kompoti, in the prefecture of Arta, have been identified positions where sedimentary gold is present. Recently, positions where sedimentary gold is present, within the sedimentary rocks of the submarine fans, in the region of Peta–Kompoti, prefecture of Arta, have been identified. For the continuation and the practical application of these positive results, it was necessary to obtain a documented reference of geological parameters. After a series of new sampling and detailed analysis of the samples, this work presents the detected gold concentrations, illustrates the limits of grouping areas of interest as well as delineating and illustrating palaeogeographic factors that have contributed to the creation of gold-bearing formations. The highest gold concentration found was in the Ta Bouma sequence. The observation of constant indications of high gold values above background that suddenly increase in certain places up to 260 ppb, leads to the conclusion that in the broader area and within locations with equivalent formations procedure, there could be gold pockets of exploitable concentrations.
CORELLATION OF LATE TRIASSIC AND EARLY JURASSIC LOFER-TYPE CARBONATES FROM THE PELOPONNESUS PENINSULA, GREECE
Authors: Photiades Α. , Pomoni-Papaioannou F.A. , Kostopoulou V.
Published: January 2017

Correlation of the Late Triassic carbonate successions, formed at the passive Pelagonian margin (SE of Dhidymi Mt.) with the Early-Middle Liassic successions of the Gavrovo-Tripolitza zone (SE of Leonidion), in eastern and central Peloponnesus respectively, is attempted. Detailed microfacies analysis revealed that the studied carbonate formations were deposited in analogous restricted inner-platform environments (lagoon-peritidal domain) and are composed of meter-scale, shallowing-upward, mostly incomplete peritidal cycles. The top of the supratidal and/ or shallow subtidal deposits are often affected by meteoric diagenesis tracing sea-level lowering and periodic emersions episodes. The well-developed pedogenic features observed in the Early Jurassic platform carbonates indicate long-lasting subaerial exposure intervals and semi-arid to arid climate. Instead, the Late Triassic strata preserve vadose diagenetic indices which point to shorter exposure events, weaker meteoric alteration and slightly wetter climatic conditions. The detected sedimentological features suggest the occurrence of wide lagoonal-peritidal depositional systems during Late Triassic and Early Jurassic, eastern and western of the Pindos basin, respectively. The basic facies pattern and the meter-scale cyclicity show many analogies with the Lofer cycles of the Alpine Triassic, supporting that in the Hellenides the Dachstein-type platform systems evolved till Early-Middle Liassic (Gavrovo-Tripolitza zone).