Formation of Berthierine in the Martian Meteorite Nakhla by Replacement Of Aluminosilicate Glass [abstract]

No abstract available

Investigating the non-compliant purchasing behavior at Company X - A case study

The purpose of this study was to identify the reasons behind the employees noncompliant purchasing behavior at Company X. Another aim was to find the solutions to the reasons behind the non-compliant purchasing behavior to change that behavior. This study was carried out by following an abductive approach, where a qualitative case study research was conducted. The chosen case study method was a multiple case study, where six cases was studied by interviews. It was found that the main reasons behind the employees non-compliant purchasing behavior at Company X is the unfamiliarity with frame agreements and the lack of training in IT-systems. These reason are seen as un-intentional and forced purchasing behavior, though the employees intention are not to harm the company. The conclusion drawn from this study is that employees that are to do purchasing needs education in general purchasing and training in using the IT-systems. Employees that have knowledge in purchasing tends to now fall into non-compliant purchasing behavior

PECULIARITIES AND USEFULNESS OF MULTIPLIERS, ELASTICITIES AND LOCATION QUOTIENTS FOR THE REGIONAL DEVELOPMENT PLANNING: AN OTHER VIEW

In this paper, the peculiarities of type I multipliers and elasticities and their differences on the generated results for the proposed developmental priorities are examined. Moreover the influences of the used non-survey techniques (Simple Location Quotient, Cross Industry Location Quotient and Flegg’s Location Quotient) among the sectoral rankings from the type I multipliers and elasticities are scrutinized. For the target of the paper, the economy of Western Macedonia region in Greece has been used as an example for the secondary simulation. The results show that the type I multipliers and elasticities are not end up to same sectoral rankings due to their different definition and are not the same suitable indicators for short-term and long-term developmental planning. Nevertheless, their coexistence could improve the economic prosperity both on short and long period of time. As for the used location quotient, the FLQ technique improves the proximity of the sectoral rankings that are generated from all the used indicators and also reduces the magnitudes of type I multipliers and elasticities.Input-output analysis, regional planning, multipliers, elasticities, non-survey techniques

Workers or Investors? Investigating the Reciprocity Aspects among Greek Social Enterprises Members

In Europe 160 million people are members of social economy enterprises and mutual societies. Members that work at social enterprises usually are bound with an employee relationship with their organization; on the other hand participating in a social enterprise could be their only chance to find a job, especially for economies that face a long-term recession such as the Greek economy. Social enterprises and entrepreneurs invest in reciprocity which represents that positive actions will inspire reciprocal positive actions. The main objective of this study is to examine the effect of reciprocity on members’ decision either to invest in social enterprises or to work for them acquiring in both cases the necessary shares. For this reason, a survey was conducted among Greek members of social enterprises listed in the Greek Social enterprises directory, to investigate their aspects about reciprocity and if these aspects affect their decision to work in a social enterprise or support financially them. The survey process returned 142 fully completed questionnaires. The analysis identified a sub group (5 over 27 items) of the questions used to measure reciprocity that can be used to classify participants into shareholders - members (investors) and shareholders - workers in social enterprises. It is worth mentioning that sex or other demographic characteristics of the respondents do not affect this classification while there are only aspects of positive reciprocity that have either positive or negative effect on the possibility to work in social enterprises. Social entrepreneurs and the Greek state could use these findings in order to direct and manage their expansion efforts

Fisheries policies impacts consideration towards the development of rural coastal areas

The current study aims to examine the effectiveness of fisheries policies and specifically of the Greek Operational Programme for Fisheries, 2007-13. In specific, aims to examine and assess possible impacts generated, in the regional economy of Voreio and Notio Aigaio from its four axis, with particularity to the forth one. For this a regional Input-Output model was built in order to capture direct and indirect impacts in terms of output, employment and income. Results indicate that the dynamics of the fisheries sector in the regional economy are very weak and along with the continuous shrinking of the sector, leads to the necessity of supporting alternative vocational activities for the development of coastal rural areas. Though, results indicate that the funds attributed to such policies are very small, resulting in very weak generated impacts in the regional economy. And thus it is not expected current policies to seriously affect the development of such regions through the promotion of alternative to fishing activities.rural coastal areas, operational fisheries programme, impact analysis, regional analysis, Community/Rural/Urban Development, R11, R15, R58, Q22,

¿Trabajadores o Inversores? Investigar los aspectos de reciprocidad entre los miembros de las Empresas Sociales Griegas

In Europe 160 million people are members of social economy enterprises and mutual societies. Members that work at social enterprises usually are bound with an employee relationship with their organization; on the other hand participating in a social enterprise could be their only chance to find a job, especially for economies that face a long-term recession such as the Greek economy. Social enterprises and entrepreneurs invest in reciprocity which represents that positive actions will inspire reciprocal positive actions. The main objective of this study is to examine the effect of reciprocity on members’ decision either to invest in social enterprises or to work for them acquiring in both cases the necessary shares. For this reason, a survey was conducted among Greek members of social enterprises listed in the Greek Social enterprises directory, to investigate their aspects about reciprocity and if these aspects affect their decision to work in a social enterprise or support financially them. The survey process returned 142 fully completed questionnaires. The analysis identified a sub group (5 over 27 items) of the questions used to measure reciprocity that can be used to classify participants into shareholders - members (investors) and shareholders - workers in social enterprises. It is worth mentioning that sex or other demographic characteristics of the respondents do not affect this classification while there are only aspects of positive reciprocity that have either positive or negative effect on the possibility to work in social enterprises. Social entrepreneurs and the Greek state could use these findings in order to direct and manage their expansion efforts.En Europa, 160 millones de personas son miembros de empresas de economía social, así como de mutuas. Los miembros que trabajan en empresas sociales generalmente están vinculados con una relación de empleados con su organización; por otro lado, participaren una empresa social podría ser su única oportunidad de encontrar un trabajo, especialmente para las economías que enfrentan una recesión a largo plazo, como la economía griega. Las empresas sociales y los empresarios invierten en reciprocidad que representa que las acciones positivas inspirarán acciones positivas recíprocas. El objetivo principal de este estudio es examinar el efecto de la reciprocidad en la decisión de los miembros de invertir en empresas sociales o trabajar para ellos, adquiriendo en ambos casos las acciones necesarias. Por este motivo, se realizó una encuesta entre los miembros griegos de las empresas sociales enumeradas en el directorio de empresas sociales griegas, para investigar sus aspectos sobre la reciprocidad y si estos aspectos afectan su decisión de trabajaren una empresa social o apoyarlos financieramente. El proceso de la encuesta arrojó 142 cuestionarios completos que se utilizaron para cumplir el objetivo de la encuesta. El análisis de regresión logística identificó un subgrupo (5 sobre 27 ítems) de las preguntas usadas para medir la reciprocidad que pueden usarse para clasificar a los participantes en accionistas: miembros (inversores) y accionistas – trabajadores en empresas sociales. Vale la pena mencionar que el sexo u otras características demográficas de los encuestados no afectan esta clasificación, mientras que solo hay aspectos de reciprocidad positiva que tienen un efecto positivo y negativo sobre la posibilidad de trabajar en empresas sociales.Escuela de Estudios CooperativosFac. de Ciencias Económicas y EmpresarialesTRUEpu

Optical tweezers with enhanced efficiency based on laser-structured substrates

We present an optical nanotrapping setup that exhibits enhanced efficiency, based on localized plasmonic fields around sharp metallic features. The substrates consist of laser-structured silicon wafers with quasi-ordered microspikes on the surface, coated with a thin silver layer. The resulting optical traps show orders of magnitude enhancement of the trapping force and the effective quality factor

A conspicuous clay ovoid in nakhla: Evidence for subsurface hydrothermal alteration on mars with implications for astrobiology

A conspicuous biomorphic ovoid structure has been discovered in the Nakhla martian meteorite, made of nanocrystalline iron-rich saponitic clay and amorphous material. The ovoid is indigenous to Nakhla and occurs within a late-formed amorphous mesostasis region of rhyolitic composition that is interstitial to two clinopyroxene grains with Al-rich rims, and contains acicular apatite crystals, olivine, sulfides, Ti-rich magnetite, and a new mineral of the rhoenite group. To infer the origin of the ovoid, a large set of analytical tools was employed, including scanning electron microscopy and backscattered electron imaging, wavelength-dispersive X-ray analysis, X-ray mapping, Raman spectroscopy, time-of-flight secondary ion mass spectrometry analysis, high-resolution transmission electron microscope imaging, and atomic force microscope topographic mapping. The concentric wall of the ovoid surrounds an originally hollow volume and exhibits internal layering of contrasting nanotextures but uniform chemical composition, and likely inherited its overall shape from a preexisting vesicle in the mesostasis glass. A final fibrous layer of Fe-rich phases blankets the interior surfaces of the ovoid wall structure. There is evidence that the parent rock of Nakhla has undergone a shock event from a nearby bolide impact that melted the rims of pyroxene and the interstitial matter and initiated an igneous hydrothermal system of rapidly cooling fluids, which were progressively mixed with fluids from the melted permafrost. Sharp temperature gradients were responsible for the crystallization of Al-rich clinopyroxene rims, rhoenite, acicular apatites, and the quenching of the mesostasis glass and the vesicle. During the formation of the ovoid structure, episodic fluid infiltration events resulted in the precipitation of saponite rinds around the vesicle walls, altered pyrrhotite to marcasite, and then isolated the ovoid wall structure from the rest of the system by depositing a layer of iron oxides/hydroxides. Carbonates, halite, and sulfates were deposited last within interstitial spaces and along fractures. Among three plausible competing hypotheses here, this particular abiotic scenario is considered to be the most reasonable explanation for the formation of the ovoid structure in Nakhla, and although compelling evidence for a biotic origin is lacking, it is evident that the martian subsurface contains niche environments where life could develop. Key Words: Biomorph—Clays—Search for life (biosignatures)—Martian meteorites—Hydrothermal systems. Astrobiology 14, 651–693

Molecular, chemical and morphological evidence for hematite biogenicity at the Quaternary Cape Vani Mn-(Ba-Fe) deposit, Milos, Greece

Η γένεση ιζηματογενών πετρωμάτων πλούσιων σε σίδηρο, κυρίως αιματίτη, μέσω βιολογικών ή αβιοτικών διεργασιών, η κάποιου συνδυασμού αυτών, παραμένει άλυτο επιστημονικό πρόβλημα. Στην εργασία αυτή χρησιμοποιήσαμε έναν συνδυασμό αναλυτικών μεθόδων που συμπεριλαμβάνουν οπτική μικροσκοπία, ηλεκτρονική μικροσκοπία σάρωσης και μικροανάλυση (SEM-EDS), φασματοσκοπία Raman και φασματομετρία μάζας χρόνου πτήσης δευτερογενών ηλεκτρονίων (time-of-flight secondary ion mass spectrometry, TOF-SIMS), για να προσδιορίσουμε την χωρική κατανομή και την σύσταση εν δυνάμει γεωβιολογικών δεικτών (π.χ. μικροβιακά μικροαπολιθώματα, ιχνοστοιχεία, οργανικές ιοντικές ενώσεις) σε αιματιτικούς μικροστρωματόλιθους και μικροδομές από αιματίτη που μοιάζουν με oncolites (ονκόλιθους). Οι μικροδομές αυτές προσδιορίστηκαν σε υλικό πλούσιο σε σίδηρο που αποτελεί συνδετικό υλικό παράλιου κροκαλοπαγούς Τεταρτογενούς ηλικίας από την ευρύτερη περιοχή του ακρωτηρίου Βάνι, στη ΒΔ Μήλο. Ο προσδιορισμός μορφολογικών, χημικών και οργανικών μοριακών ιοντικών βιοδομών σε συνδυασμό με πιθανά μικροαπολιθώματα από αιματίτη, υποδηλώνουν μικροβιακή μεσολάβηση στον σχηματισμό των τελευταίων, και υποδεικνύουν ότι μικροστρωματόλιθοι από αιματίτη μπορεί να χρησιμοποιηθούν ως βιοδείκτες για τη ύπαρξη σιδηρούχων βίο- υλικών στη Γη, και για την ανίχνευση τους σε εξωγήινα υλικά. Η μελέτη των αιματιτικών μικροστρωματόλιθων του ακρωτηρίου Βάνι μπορεί να συμβάλει στην κατανόηση των λειτουργιών των μικροοργανισμών στην γένεση τόσο σύγχρονων όσο και παλαιών κοιτασμάτων σιδήρου.Many aspects of the biotic or abiotic origin of iron-rich sedimentary rocks consisting mainly of hematite, an important indicator for exobiology, remain unresolved. Here, we use combined optical microscopy, scanning electron microscopy and energy dispersive X-ray spectrometry (SEM-EDS), Raman spectroscopy and time-of-flight secondary ion mass spectrometry (TOF-SIMS), to image the spatial distribution, and determine the composition, of potential biogenic markers (microbial microfossils, trace elements, organic ion species) in hematitemicrostromatolites and oncolite-like microstructures. These structures are identified in iron-rich material cementing a Quaternary fossil-beach conglomerate deposit in the Cape Vani area, NW Milos Island, Greece. The combined detection of morphological, chemical, and molecular organic-ion, biomarkers closely associated with possible hematite microfossils within microstromatolite laminae, strongly supports microbial mediation for their formation, and indicates that hematitic microlamination may be used as a biosignature for Fe-rich biomats on Earth and for their detection in extra-terrestrial materials. The Cape Vani hematitemicrostromatolites may contribute to growing our understanding of the function of microorganisms in the genesis of modern and ancient Fe deposits

LASER μ-RAMAN INVESTIGATION OF GREEK BAUXITES FROM THE PARNASSOS-GHIONA ACTIVE MINING AREA

Δείγματα βωξίτη τα οποία αποκτήθηκαν από εταιρείες που εμφανίζουν ενεργή μεταλλευτική δραστηριότητα στην περιοχή Παρνασσού-Γκιώνας χαρακτηρίσθηκαν αρχικά με τη χρήση συμβατικών μεθόδων (οπτικό μικροσκόπιο, περίθλαση ακτινών Χ) και στη συνέχεια μελετήθηκαν χρησιμοποιώντας, για πρώτη φορά στη διεθνή βιβλιογραφία, προηγμένες μή-καταστροφικές φασματοσκοπικές τεχνικές σε μικροκλίμακα (Laser μ-Raman). Τα αποτελέσματα της παρούσας μελέτης έδειξαν πως ο τύπος του βωξίτη (διασπορικός ή μπαιμιτικός) μπορεί εύκολα να προσδιοριστεί, ανεξάρτητα από το είδος του δείγματος (πορώδες ^κό-τεφρό ή και συμπαγές ερυθρό-φαιό), μέσω της καταγραφής του φάσματος του στην περιοχή χαμηλών ενεργειών (250 cm' - 600 cm'1) όπου και είναι ευδιάκριτες συγκεκριμένες Raman ταινίες των πολύμορφων του ΑΙΟΟΗ (448 cm' για το διάσπορο και 362 cm'1 για τον μπαιμίτη). Η παραπάνω μικρο-μέθοδος θα μπορούσε να εφαρμοσθεί για τον άμεσο προσδιορισμό των ορυκτολογικών φάσεων τόσο στο εργαστήριο όσο και επιτόπου στα μεταλλεία, έτσι ώστε να αποφευχθούν έμμεσες και χρονοβόρες ολικές τεχνικές οι οποίες χρησιμοποιούνται έως και σήμερα (όπως π.χ. η περίθλαση ακτινών Χ).Bauxite samples collected with permission from currently active mining areas in the Parnassos-Ghiona Mts district were studied using both conventional (optical microscopy and powder XRD) and, for the first time in the literature, micro-scale advanced non-destructive spectroscopic techniques, in particular Laser μ-Raman. The results showed that the different bauxite types (diasporic or boehmitic) can easily be identified regardless of sample type (porous white-grey or massive redbrown) by recording spectra in the low-wavenumber region (250 cm' - 600 cm' ) where distinct bands of the natural AlOOHpolymorphs are easily discernible (448 cm' for diaspore and 362 cm' for boehmite). The method described herein could equally be applied in the laboratory as well as in-situ at the mines for quick and accurate phase determination, in order to bypass the laborious and time-consuming indirect bulk techniques (such as XRD) routinely used to this date