bluuebunny/crossref_metadata_2025 huggingface dataset:
The evolution of microstructure during the transformation of Mg2GeO4 olivine to spinel
Authors: Rubie David C. , Champness Pamela E.
Published: March 2019

On a étudié la transformation olivine → spinelle en fonction du temps dans Mg2GeO4 à l'aide de la microscopie optique et électronique en transmission. On n'observe pas de relations d'orientation simples entre l'olivine et le spinelle et la transformation n'implique donc pas de cisaillement aux conditions de température et pression des expériences.

Dans les premiers stades de la transformation (< 5 h) à 900 °C, 20 kbar, une grande densité de dislocations et une structure de sous-joints se développent dans l'olivine résiduelle par un processus de restauration dynamique. A 800 °C, 10 kbar, on observe une grande densité de dislocations mais pas de restauration. Ces microstructures sont attribuées à de fortes contraintes différentielles résultant de la variation de volume de — 8 %. Le spinelle se nuclée probablement d'abord aux joints de grains de l'olivine, à la surface des pores résiduels et à la surface de l'échantillon. Le spinelle croît sous forme d'agrégats caractérisés par des sous-joints et des joints de grains. La taille de grain moyenne ~ 1 µm est nettement plus petite que celle de l'olivine de départ (~ 30 µm). Cette réduction de taille de grain est probablement due au champ de contrainte qui se développe autour des particules durant leur croissance ; ce champ peut éventuellement bloquer leur croissance. Un nouveau grain d'orientation différente nuclée alors à la paroi d'interphase.

Les fautes {110} présentes dans le spinelle sont, pour l'essentiel, attribuées à la dissociation des dislocations en partielles.
Solubilité des hydroxydes d'aluminium dans l'eau à 80 °C
Authors: Sanjuan Bernard , Michard Gil
Published: March 2019

On a mesuré la solubilité de l'hydroxyde d'aluminium dans l'eau à 80 °C en fonction du pH. Les produits de solubilité (p*Ks4) mesurés en milieu acide et en milieu basique diffèrent de plus d'une unité (10,9 et 12,6). Cette différence est liée au fait que la gibbsite évolue en bayérite (ou nordstrandite) dans les solutions basiques alors qu'elle reste stable dans les solutions acides. La comparaison avec une étude précédente effectuée à 50 °C permet de déterminer la courbe de variation du produit de solubilité de la bayérite.

log*Ks4 = 46,35 - 6286/T - 16,1 log T

et de la gibbsite "microcristalline"

log Ks0 = 177,49 - 13135/T - 67,3 log T.

Prenant en compte les nombreuses autres déterminations, nous présentons en conclusion un tableau des ΔGf0 et ΔHf0 des ions et hydroxydes d'aluminium.
Geochemistry of amphibole pyroxenite veins from the Lherz and Freychinède ultramafic bodies (Ariège, French Pyrenees)
Authors: Bodinier Jean-Louis , Fabriès Jacques , Lorand Jean-Pierre , Dostal Jarda , Dupuy Claude
Published: March 2019

Les veines de pyroxénite à amphibole et de hornblendite des massifs de péridotite de haute température de Lherz et Freychinède (Ariège, Pyrénées françaises) sont des cumulats formés par ségrégation minérale à HP-HT. Les compositions en éléments majeurs et trace des roches totales et des minéraux séparés sont identiques à celles des veines à amphibole des enclaves ultrabasiques dans les basaltes alcalins et à celles des mégacristaux. Pyroxénites et hornblendites sont équilibrées avec des liquides dont les caractéristiques sont celles des basaltes alcalins. Leur cristallisation est probablement associée au magmatisme crétacé des Pyrénées, les veines se mettant en place dans les niveaux supérieurs du manteau lithosphérique. Les veines minces et les bordures des plus épaisses ont été affectées par une rééquilibration de subsolidus avec la péridotite encaissante, se traduisant par une diminution de Fe et une augmentation de Mg et Cr. Des veines de ce type, formées aux dépens de magmas alcalins, peuvent être localement abondantes dans le manteau supérieur où elles seraient responsables d'enrichissements en éléments incompatibles.
Enclaves ultrabasiques carbonatisées avec traces d'or, dans les anatexites du Haut-Allier (France)
Authors: Leblanc Marc , Didier Jean
Published: March 2019

Many ultramafic xenoliths in the Leptyno-amphibolite Group of the Haut-Allier (French Massif Central) are transformed into carbonate-bearing-rocks. The less transformed ultramafic rocks are pargasite-bearing harzburgites corresponding to metasomatized, possibly infracontinental, mantle rocks (light-REE enrichment). They were introduced as boudins into the continental crust along a major lithospheric thrust, then serpentinized and carbonatized. The carbonatization postdates the formation of a zoned talc-anthophyllite-phlogopite shell under anatectic conditions. Mineral composition trends as well as major and trace element abundances (including REE) indicate carbonate metasomatism from the surrounding anatexites, probably during a late sericite-chlorite retrograde metamorphism. The resulting carbonate-bearing-rocks show 0.1 ppm gold content, which may be linked to the presence of accessory sulphides and sulpho-arsenides. A similar gold enrichment has been described in carbonatized ultramafic rocks (listwaenites) from ophiolite complexes.
Ilménite et pseudobrookite (kennedyite) magnésiennes dans les cumulats ultrabasiques de l'intrusion stratifiée occidentale de Laouni, Hoggar méridional (Algérie)
Authors: Lorand Jean-Pierre , Cottin Jean-Yves
Published: March 2019

High-Mg pseudobrookite ("kennedyite", MgO ~ 11 wt.%) occurs as inclusions in chrome spinel from an ultrabasic orthocumulate of the Western Laouni layered intrusion, Southern Hoggar, Algeria, where it coexists with Mg-rich ilmenite (MgO ~ 10 wt.%). The crystallization of both oxides is attributed to movements of Ti-rich differentiated liquids that have infiltrated while the liquid remaining in the orthocumulates was still very magnesian. At lower temperature, pseudobrookite was isolated from the liquid, due to trapping within the spinel.
A new method for obtaining the principal reflectances of absorbing minerals
Authors: Marcos Pascual Celia , Virgós Rovira José M.
Published: March 2019

A computer program has been developed which allows a refinement of reflectance measurements on polished grain mounts of absorbing minerals, using Fourier analysis. The observed reflectances of each section are obtained from eight measurements, by rotating the stage through 45° sectors.

Statistical processing of the results, corresponding to 100 random sections, gives the sample statistical parameters.

An inference method for the principal reflectances of a mineral can be derived from the sample statistical parameters.

The inference method has been applied to an absorbing anisotropic mineral, stibnite, which has yielded values for the principal reflectances at a wavelength of 546 nm. These values in air are : Rg = 45.2 ± 0.5, Rm = 40. 1 ± 0.7 and Rp = 30.7 ± 0.6 ; and in oil : Rg = 29.7 ± 0.4, Rm = 25.2 ± 0.8 and Rp = 16.0 ± 0.7 ; the error intervals correspond to a confidence limit of 95.45 %. From the principal reflectances determined in two immersion media, the optical constants can be obtained (n, refractive index and k, absorption coefficient) : ng = 3.24, nm = 3.16, np = 3.11, kg = 2.40, km = 1.90 and kp = 1.03.
L'eucrite de Bouvante. Chimie, pétrologie et minéralogie
Authors: Christophe Michel-Lévy Mireille , Bourot-Denise Michèle , Palme Herbert , Spettel Bernhardt , Wänke Heinrich
Published: March 2019

The Bouvante eucrite, meteorite found on 30-07-1978, is a monomict recrystallized basaltic breccia. The mineralogy consists of zoned plagioclase and pyroxenes. These have rather constant Mg-contents (10-11 % MgO) while Ca and Fe contents show considerable variations. Tridymite, quartz, chromite, ilmenite, zircon, merrillite, iron and troilite are also found.

Chemical analyses show that this basalt which belongs to the Fe-rich end of the eucrite range is richer in incompatible trace-elements than all similar rocks analysed so far. It may represent a very low degree of partial melting of the source-rocks ; it would have flown superficially before being covered by a thick layer of debris and it would have come again on the surface of the parent body when impacted.
L'uranium marqueur de la croissance cristalline : mise en évidence par les traces de fission dans les zircons gemmes d'Espaly (Haute-Loire, France)
Authors: Carpéna Joëlle , Gagnol Isabelle , Mailhé Didier , Pupin Jean-Pierre
Published: March 2019

A precise fission track mapping of uranium has been carried out on zircon crystals from Espaly (Haute-Loire, France). Uranium appears to be a good marker of crystal growth. Oscillatory zoning of uranium and hourglass distribution yield information on growth rate and site of the uranium incorporation in zircon during the crystal growth.
A Cypriot Sequence in Early Iron Age Crete: Heirlooms, Imports and Adaptations
Authors: Kourou Nota
Published: March 2019

L’étude est consacrée à une série d’importations chypriotes en Crète datant du début de l’Âge du Fer. Il s’agit surtout de catégories spécifiques d’objets et de vases rituels qui ont eu une influence majeure sur la communauté locale. Pour répondre à la demande créée par ces importations, les ateliers locaux développent une production similaire, qui reprend exactement les mêmes types de vases et d’objets, et qu’on appelle «créto-chypriotes » . Contrairement à un usage courant mais erroné, le terme ne s’applique qu’aux imitations exactes d’importations chypriotes et non pas à tous les vases crétois dont la décoration ou la forme sont légèrement influencées par les productions chypriotes. La conclusion principale de cette recherche est que ces ateliers crétois, ainsi que les importations, forment une série chypriote en Crète, qui a ses origines à la fin de l’Âge du Bronze ; cela explique l’existence de reliques chypriotes (heirlooms) au début de la série.
Funerary architecture and other underground structures in Hellenistic Cyprus and Rhodes
Authors: Michaelidès Demetrios , Guimier-Sorbets Anne-Marie
Published: March 2019

Fondée sur la comparaison des tombes monumentales de deux grandes îles de la Méditerranée orientale, Chypre et Rhodes, durant l’époque hellénistique, cette étude met en évidence les points communs et les différences architecturales des tombes de Néa Paphos («Tombeau des rois » ), de la ville de Rhodes (Rhodini, Korakonéro…) et de Lindos (Archokratéion). Les caractéristiques principales de l’architecture et du décor de ces tombes dénotent l’influence des nécropoles d’Alexandrie : Chypre et Rhodes, deux îles importantes du royaume lagide, ont toutes deux été influencées par le même modèle funéraire alexandrin, qu’elles se sont toutefois approprié de façon différente. À Néa Paphos, la fonction originelle des hypogées d’Agia Solomoni et d’Agios Lambrianos, généralement considérés comme des catacombes, peut être revue à la lumière des nymphées souterrains de l’acropole de Rhodes.
Les monnaies de Kition-Bamboula
Authors: Callot Olivier
Published: March 2019

124 coins have been found on the site of Kition-Bamboula during the Swedish (1929) and French excavations (1976-2004). Despite their poor preservation, they provide a framework for the history of this area of ancient Kition and today Larnaca, from the IVth century BC to present times.
Les élites de Narbonnaise de leur cité jusqu’au coeur du pouvoir romain : études de cas et contexte historique. Introduction
Authors: Rossignol Benoît
Published: March 2019

À travers un retour historiographique sur l’oeuvre de Ronald Syme, on propose un bilan introductif sur l’intégration des élites de Narbonnaise aux élites impériales romaines. Particulièrement forte et précoce, elle s’inscrit dans une chronologie propre. Les facteurs économiques et culturels se combinaient étroitement avec l’insertion dans les cadres romains pour permettre une ascension politique et sociale. La richesse et des dispositions sociales variables (culture lettrée, capacités militaires) étaient nécessaires mais l’intégration au champ social des élites romaines n’est pas séparable de l’histoire de ce champ et des opportunités qu’elle ouvrait en particulier par les relations de clientèle. La multiplicité des parcours est cependant remarquable. L’exemple des Duvii de Vaison-la-romaine est approfondi pour souligner la précocité souvent sous-estimée de leur intégration.
La domus au Salon noir. Nouvelles données sur l’habitat résidentiel d’Aix-en-Provence aux Ier et IIe s. ap. J.-C. 2. Le décor mural de la salle à la Mosaïque noire
Authors: Allag Claudine , Lefèvre Jean-François
Published: March 2019

Through the study of mural paintings collapsed on the mosaic of a reception room, in the domus au Salon noir in Aix-en-Provence, it was possible to reconstruct a large part of the painted decoration ; the datation is the third quarter of 1st c. AD, and it is clearly characteristic of the Fourth provincial style. The ornamental composition is rather common but features original choices of tints and of a few motives. Some fragments could be part of the decoration of the ceiling. The remarkable state of preservation of plasters from two walls allows to recompose the architectural volume of this room.
Apport des découvertes récentes sur le site de Château-Bas (Vernègues, Bouches-du-Rhône)
Authors: Chapon Philippe , Agusta-Boularot Sandrine
Published: March 2019

Au lieu-dit Château-Bas, sur la commune de Vernègues, le temple gallo-romain, dont une partie de l’élévation et de l’ordre corinthien subsistent encore in situ, a longtemps été le seul édifice visible. Les prospections, les fouilles programmées et différents diagnostics menés depuis la fin des années 1990, en plusieurs points du vallon de Cazan, et en particulier à proximité du temple, permettent de restituer l’occupation antique de cette zone sise en limite nord-ouest du territoire d’Aquae Sextiae. Notre vision du site se trouve désormais entièrement renouvelée. Cet article propose un bilan de l’ensemble de ces découvertes, qui conduisent à identifier le site à une agglomération rurale contemporaine du temple au moment de sa construction, entre extrême fin de la République et tout début du Principat d’Auguste. Nous en connaissons désormais les voies d’accès et les limites, qui dessinent une airée habitée d’au moins 8 hectares. Outre un vaste sanctuaire augustéen établi sur deux terrasses au pied de la colline et de nombreuses installations hydrauliques, le site comprenait un quartier à vocation artisanale et/ ou commerciale (verre, textile…), divers habitats (murs, tesselles de mosaïque, enduits peints…), des thermes ( ?) et une grande villa ou une grande domus à vocation mixte, vinicole et oléicole. Ce site fut occupé au moins jusqu’à la fin du Ve s. de n. è.
Deux aires de culte païen de l’Antiquité tardive aux frontières de la Narbonnaise, à Décines (Rhône)
Authors: Ferber Emmanuel , Motte Sylvain , Bonnet Christine , Cécillon Christian
Published: March 2019

Dans l’est lyonnais, deux fouilles menées consécutivement sur une surface totale de 9 ha, ont permis, la découverte de deux espaces cultuels mis en place dans la seconde moitié du IV e siècle de notre ère et probablement abandonnés dès la première moitié du V e siècle. Le sanctuaire septentrional, délimité par un péribole fossoyé, comprend un temple à galerie périphérique bordé au nord et au sud par de grandes dépressions temporairement en eau. Ce temple s’ouvre à l’est sur un cheminement qui distribue des bâtiments plus modestes et une aire où se concentrent des fosses rituelles. Le mobilier, dont des monnaies et divers objets métalliques, issu de ces fosses, mais aussi recueilli sur le pourtour du temple et des édicules annexes, présente certains caractères spécifiques à un contexte sacré. Placés à quelque 500 m au sud-est du premier ensemble, deux édicules de plan carré construits au carrefour de deux chemins forment le second pôle religieux. Une soixantaine de monnaies, permettant une datation précise de l’occupation des lieux, constitue l’essentiel des offrandes. L’édification, ex nihilo, de deux sanctuaires voisins dans la seconde moitié du IV e siècle reste une exception et répond probablement à un besoin particulier. Situées à la frontière d’un territoire rétrocédé à la cité de Vienne à cette époque, il est possible que ces consécrations aient été réalisées pour matérialiser l’événement.
Le pelecinum de Doumet sur la commune de Châteauvert (Var)
Authors: Bonnin Jérôme , Michel Jean-Marie , Thiant Jean-Yves
Published: March 2019

Sur le lieu-dit «Doumet » de la commune de Châteauvert, un cadran solaire a été mis au jour de façon fortuite en 1993. L’analyse de l’instrument indique qu’il s’agit d’un élément bien particulier de la gnomonique antique, un cadran plan vertical dièdre. Cette typologie même, de type pelecinum, en fait un objet particulièrement rare pour la Gaule antique. L’état de conservation de l’ensemble des éléments constitutifs du cadran est par ailleurs unique dans le corpus des cadrans solaires de ce type connus pour l’ensemble du monde antique. Enfin, la qualité de l’exécution ainsi que le lieu même de la découverte, à l’écart de tout centre connu ou de construction antiques interrogent sur la destination de cet objet. Une simple fonction de cadran solaire étonne en effet sur un site aussi isolé. L’hypothèse qu’il provienne d’une pile funéraire servant de marqueur topographique sur une hauteur proche d’une voie publique romaine, sur un point critique aux confins des cités antiques d’Aix et de Fréjus est proposée.
On the transformation of “zincone”-like into porous ZnO thin films from sub-saturated plasma enhanced atomic layer deposition
Authors: Perrotta Alberto , Pilz Julian , Pachmajer Stefan , Milella Antonella , Coclite Anna Maria
Published: March 2019

The synthesis of nanoporous ZnO thin films is achieved through annealing of zinc-alkoxide (“zincone”-like) layers obtained by plasma-enhanced atomic layer deposition (PE-ALD). The zincone-like layers are deposited through sub-saturated PE-ALD adopting diethylzinc and O2 plasma with doses below self-limiting values. Nanoporous ZnO thin films were subsequently obtained by calcination of the zincone-like layers between 100–600 °C. Spectroscopic ellipsometry (SE) and X-ray diffraction (XRD) were adopted in situ during calcination to investigate the removal of carbon impurities, development of controlled porosity, and formation and growth of ZnO crystallites. The layers developed controlled nanoporosity in the range of 1–5%, with pore sizes between 0.27 and 2.00 nm as measured with ellipsometric porosimetry (EP), as a function of the plasma dose and post-annealing temperature. Moreover, the crystallinity and crystallite orientation could be tuned, ranging from a powder-like to a (100) preferential growth in the out-of-plane direction, as measured by synchrotron-radiation grazing incidence XRD. Calcination temperature ranges were identified in which pore formation and subsequent crystal growth occurred, giving insights in the manufacturing of nanoporous ZnO from Zn-based hybrid materials.
MATHEMATICAL MODELLING OF MODIFIED CELL DELINEATION STRATEGY IN PACKET SWITCHED NETWORKS
Authors: Kopeetsky M. , Lin A.
Published: March 2019

The paper proposes a new mathematical model of Cell Delineation (CD) strategy in any Packet Switching technology when Data Units (DUs) are of constant length. A special strategy that differentiates between synchronization failures and other channel errors with the sufficiently high confidence level has been proposed, analyzed and optimized. The mathematical analysis of the strategy is presented on the Asynchronous Transfer Mode (ATM) network example. The CD cycle implementation time is discussed and analyzed. The numerical results are presented for the case of the standard CD protocol.
EXPRESSIONS OF SOLUTIONS OF ORDINARY DIFFERENTIAL EQUATIONS BY STANDARD FUNCTIONS
Authors: Navickas Z. , Bikulčiene L.
Published: March 2019

It is well known that solutions of many ordinary differential equations allow presentation in the power series form. In the paper we introduce and analyze rigorous conditions under which the later series (solutions) can be reduced to a finite sum of standard functions. Some areas of practical applicability of the proposed algorithm are discussed.
MODELLING TRAVEL TIME DISTRIBUTION AND ITS INFLUENCE OVER STOCHASTIC VEHICLE SCHEDULING
Authors: Shen Yindong , Xu Jia , Wu Xianyi , Ni Yudong
Published: March 2019

Due to the paucity of well-established modelling approaches or well-accepted travel time distributions, the existing travel time models are often assumed to follow certain popular distributions, such as normal or lognormal, which may lead to results deviating from actual ones. This paper proposes a modelling approach for travel times using distribution fitting methods based on the data collected by Automatic Vehicle Location (AVL) systems. By this proposed approach, a compound travel time model can be built, which consists of the best distribution models for the travel times in each period of a day. Applying to stochastic vehicle scheduling, the influence of different travel time models is further studied. Results show that the compound model can fit more precisely to the actual travel times under various traffic situations, whilst the on-time performance of resulting vehicle schedules can be improved. The research findings have also potential benefit for the other research based on travel time models in public transport including timetabling, service planning and reliability measurement.
MODEL-BASED ASSESSMENT OF LONGITUDINAL DYNAMIC PERFORMANCE AND ENERGY CONSUMPTION OF HEAVY HAUL TRAIN ON LONG-STEEP DOWNGRADES
Authors: Shi Jin , Ren Shujing , Zhang Mengran
Published: March 2019

Longitudinal dynamics performance and energy consumption of heavy haul train should be considered in the design of heavy haul railway profile of long-steep downgrades. A quantitative analytical tool is developed to assess the longitudinal dynamic performance and energy consumption of heavy haul trains with large axle loads on grades with different longitudinal profiles, including a longitudinal dynamic model of the train and a method of calculating the energy consumption during the operation of heavy haul train. The model is then preliminarily validated by the data of coupler force collected in two comprehensive tests. Finally, the proposed analytical tool is used to assess the designed longitudinal track profile of a long-deep downgrade segment of the central south heavy haul railway of Shanxi (China).
Impulsive Electromagnetic Emission near a Black Hole
Authors: Thompson Christopher
Published: March 2019

The electromagnetic signature of a point explosion near a Kerr black hole (BH) is evaluated. The first repetitions produced by gravitational lensing are not periodic in time; periodicity emerges only as the result of multiple circuits of the prograde and retrograde light rings and is accompanied by exponential dimming. Gravitational focusing creates a sequence of concentrated caustic features and biases the detection of a repeating source toward alignment of the BH spin with the plane of the sky. We consider the polarization pattern in the case of emission by the Lorentz upboosting and reflection of a magnetic field near the explosion site. Then the polarized fraction of the detected pulse approaches unity, and rays propagating near the equatorial plane maintain a consistent polarization direction. Near a slowly accreting supermassive BH (SMBH), additional repetitions are caused by reflection off annular fragments of an orbiting disk that has passed through an ionization instability. These results are applied to the repeating fast radio burst (FRB) source 121102, giving a concrete and predictive example of how FRB detectability may be biased by lensing. A gravitational lensing delay of 10–30 s, and reflection delay up to ∼104 s, are found for emission near the innermost stable circular orbit of a 3 × 105
M
⊙ SMBH; these effects combine to produce interesting correlations between delay time and burst fluence. A similar repetitive pulse envelope could be seen in the gravitational wave signal produced by a collision between compact stars near a SMBH.
Discovery of Neonrosella vitiata (Darwin) and Newmanella spinosus Chan & Cheang (Balanomorpha, Tetraclitidae) from the Andaman Sea, eastern Indian Ocean
Authors: Sukparangsi Woranop , Pochai Ashitapol , Wongkunanusorn Chinnakit , Khachonpisitsak Salinee
Published: March 2019

In this present study, distantly related acorn barnacle species in the subfamily Newmanellinae (Cirripedia, Thoracica, Tetraclitidae), includingNeonrosellavitiata(Darwin, 1854) andNewmanellaspinosusChan & Cheang, 2016, were discovered in the Andaman Sea of Thailand.Neo.vitiatacan be readily distinguished from other newmanellids by shell plate and operculum morphology (external shell, tergum geometry, and pattern of parietal tube) and arthropodal characters (presence of basi-dorsal point at base of penis and triangular spines on cirri, setal type, and mouth parts). Both species were found to share overlapping territories on rocks at the rockweed zone, an area submerged under seawater most of the time throughout the year. This study highlights the first discovery ofNeonrosellain the eastern Indian Ocean, whose ultrastructure compared toNewmanellais redescribed and illustrated here based on scanning electron microscopy.
Des archives pour l’anthropologie : futurs possibles et passés contingents
Authors: Zeitlyn David
Published: March 2019

Derrida et Foucault ont fourni des clefs pour comprendre les archives. Ils voient les archives comme hégémoniques, caractéristiques des façons de penser, des modes de colonisation et de contrôle des citoyens. Cependant ils montrent aussi clairement que les archives peuvent être lues de façon subversive. Avec de la patience, une contre-lecture permet la mise au jour des voix (quelque fois des noms) des subalternes et autres exclus des archives. En lisant le long et contre le grain, les chercheurs peuvent suivre le développement des idées et leurs évolutions au travers des périodes historiques. Les archives peuvent être vues comme orphelines, contenant des substituts de performances. Les archives (papier et digitales) permettent aussi l’accès aux résultats des recherches anthropologiques selon les prescriptions des codes éthiques, mais la mise au point de ces codes peut être sujet à controverse. Quelles sortes de consentement et quelles sortes d’anonymisation peuvent être proposées ? Les archives gérées par les groupes traditionnellement étudiés par les anthropologues produisent un modèle d’archives radicales qui sont très différentes des archives conçues par les archivistes traditionnels.
Robust Target Tracking Algorithm Based on Superpixel Visual Attention Mechanism
Authors: Hu Jia , Fan Xiao Ping , Liu Shengzong , Huang Lirong
Published: March 2019

As existing target tracking algorithms are prone to drift under complex environments, the authors propose a tracking algorithm based on superpixel segmentation and visual attention mechanism. The algorithm works on a particle filter framework, by conducting a superpixel segmentation first and then building a model of the visual attention mechanism for saliently mapping. After extracting HOG features of salient regions, the authors compared the HOG feature with the target template at last, in order to locate the target region in the new frame. The proposed algorithm is evaluated on a comprehensive test platform, in which the simulation show that our tracker is more efficacious and more efficient than the previous traditional target tracking algorithms to cope with target drift issue.
Adoption and Success of e-HRM in a Cloud Computing Environment
Authors: Ziebell Robert-Christian , Albors-Garrigos Jose , Schoeneberg Klaus-Peter , Marin Maria Rosario Perello
Published: March 2019

This qualitative study examines the digitisation of HRM in a cloud-based environment. The influencing factors for the transformation from conventional HRM to eHRM are examined with a special focus on the success factors from a strategic to the operational level. Additionally, an in-depth analysis of the currently existing and new HR metrics which emerge during the transformation takes place. The study is based on interviews with HR experts with extensive experience in transforming and working with the new technology. Active participation of the HR department is relevant for the success of the digital transformation HRM project. HR metrics have not been applied extensively so far and are used less for controlling and optimizing HR processes. New metrics would increase the acceptance of the new technology and thus the success of the overall HR transformation. The main contribution is related to the field of HR software adoption of cloud-based solutions.
Spatio-Temporal OLAP Queries Similarity Measure and Algorithm
Authors: Layouni Olfa , Akaichi Jalel
Published: March 2019

Spatio-temporal data warehouses store large volumes of consolidated and historized multidimensional data, to be explored and analyzed by various users in order to make the best decision. A spatio-temporal OLAP user interactively navigates a spatio-temporal data cube (Geo-cube) by launching a sequence of spatio-temporal OLAP queries (GeoMDX queries) in order to analyze the data. One important class of spatio-temporal analysis is computing spatio-temporal queries similarity. In this article, the authors focus on assessing the similarity between spatio-temporal OLAP queries in term of their GeoMDX queries. The problem of measuring spatio-temporal OLAP queries similarities has not been studied so far. Therefore, this article aims at filling this gap by proposing a new similarity measure and its corresponding algorithm. The proposed measure and algorithm can be used either in developing query recommendation, personalization systems or speeding-up query evolution. It takes into account the temporal similarity and the basic components of spatial similarity assessment relationships.
Students' Acceptance of Gamification in Higher Education
Authors: Chung Chih-Hung , Shen Chunyi , Qiu Yu-Zhen
Published: March 2019

Gamification provides a practical approach to improving learning processes, especially the learner's motivation. However, little research has been conducted on student intentions to use gamification in higher education. Therefore, this study explored the gamification in higher educational courses by collecting surveys and discusses the factors influencing the acceptance of gamification in higher education. Based on the PLS-SEM results, students should take initial game-based learning content to be more familiar with gamification; furthermore, they could have a positive experience so that they would increase their intention. Performance expectancy is the most important factors influencing a student to accept gamification. Other factors, such as effort expectancy, social influence, facilitating conditions, involvement, skill, and control, are also important factors. With the results of this study, the instructor designer could have substantial help in planning the course content and enhance its efficiency and effectiveness.
Can Playing Games Help Students Master Concepts from General Psychology Classes?
Authors: Zielinski Dianne
Published: March 2019

As part of a final project for a general psychology course, students were required to play a game, either digital/video or on a board. Students selected their own games, and were asked to identify psychological principles in their game play. Topics included the brain, sensation and perception, human development, learning, motivation, intelligence, personality, and mental disorders. Students successfully applied all topics to game play, but to varying degrees. Student discussions on the brain and intelligence were well covered. Discussions on personality and psychological disorders issues were relatively poor. Students were able to make connections between concepts and their game-play experiences.
Solving Uncapacitated Facility Location Problem Using Heuristic Algorithms
Authors: Atta Soumen , Mahapatra Priya Ranjan Sinha , Mukhopadhyay Anirban
Published: March 2019

A well-known combinatorial optimization problem, known as the uncapacitated facility location problem (UFLP) is considered in this article. A deterministic heuristic algorithm and a randomized heuristic algorithm are presented to solve UFLP. Though the proposed deterministic heuristic algorithm is very simple, it produces good solution for each instance of UFLP considered in this article. The main purpose of this article is to process all the data sets of UFLP available in the literature using a single algorithm. The proposed two algorithms are applied on these test instances of UFLP to determine their effectiveness. Here, the solution obtained from the proposed randomized algorithm is at least as good as the solution produced by the proposed deterministic algorithm. Hence, the proposed deterministic algorithm gives upper bound on the solution produced by the randomized algorithm. Although the proposed deterministic algorithm gives optimal results for most of the instances of UFLP, the randomized algorithm achieves optimal results for all the instances of UFLP considered in this article including those for which the deterministic algorithm fails to achieve the optimal solutions.
A Multi-Objective Approach for Materialized View Selection
Authors: Prakash Jay , Kumar T.V. Vijay
Published: March 2019

In today's world, business transactional data has become the critical part of all business-related decisions. For this purpose, complex analytical queries have been run on transactional data to get the relevant information, from therein, for decision making. These complex queries consume a lot of time to execute as data is spread across multiple disparate locations. Materializing views in the data warehouse can be used to speed up processing of these complex analytical queries. Materializing all possible views is infeasible due to storage space constraint and view maintenance cost. Hence, a subset of relevant views needs to be selected for materialization that reduces the response time of analytical queries. Optimal selection of subset of views is shown to be an NP-Complete problem. In this article, a non-Pareto based genetic algorithm, is proposed, that selects Top-K views for materialization from a multidimensional lattice. An experiments-based comparison of the proposed algorithm with the most fundamental view selection algorithm, HRUA, shows that the former performs comparatively better than the latter. Thus, materializing views selected by using the proposed algorithm would improve the query response time of analytical queries and thereby facilitate in decision making.
The Direction of Causality Between Supply Chain Excellence and Firm Performance
Authors: Shi Min
Published: March 2019

A widely-accepted measure of supply chain excellence is the Supply Chain Top 25 List published annually by Gartner Research. It evaluates firms from five quality dimensions: return on assets, inventory turns, revenue growth, peer evaluation, and Gartner opinion. However, subjective voting by industrial experts and Gartner consultants are likely to be influenced by financial market variables, such as a firm's market value, alpha, beta, and market return. This article investigates whether the Gartner list is a true reflection of a firm's SCM excellence and how market variables affect the Gartner list, especially its subjective quality dimensions. Correlation and regression analysis show that the Gartner list is largely affected by a firm's market value and alpha, but is not associated with the firm's beta and market return. Moreover, the Gartner list is influenced by a firm's prior market information, but is not capable to predict its future performance.
New Governance and Digital Platform Companies
Authors: Bilbil Ebru Tekin
Published: March 2019

Based on a new governance theory as regulatory governance, this article analyzes how a new economy creates new transaction costs at the local level due to the lack of legal coordination based on diversity and competition. The literature focuses on how new platform technologies have decreased existing transaction costs (i.e., online platforms). Surrounded by uncertainties in today's diverse, complex, competitive, and a fast market environment, the lack of legal coordination has created new transaction costs for digital platform companies. There is limited research on new digital platform company experiences with high transaction costs. There is also limited information on how to overcome these costs, especially due to the lack of legal coordination. This article documents ways to understand how transaction costs are revealed through new technologies. It compares diverse regulatory impacts of the new economy on different localities, including San Francisco and Istanbul. Analyzing Uber as the case company, as well as its relationship with other stakeholders, this article adopts the governance model of regulation to identify the constitutive dynamics of the regulatory challenges. It reveals that local and global e-hail firms in the same country acquired different acceptance and responses in the local market. Thus, the level of transaction costs varied. Local communication based on diversity and competition was derived from the vested interests of lobbying powers, which led to the rising transaction costs. Comparing the local governance in two cities reveals the extent to which transaction costs affect the raison d'etre of companies to perform activities.
Early Hydration of Activated Belite-Rich Cement
Authors: Boháč Martin , Staněk Theodor , Zezulová Anežka , Rybová Alexandra , Kubátová Dana , Novotný Radoslav
Published: March 2019

Implementation of high belite cement in cement production would have strong environmental impact in reduction CO2 emissions and saving of pure limestone deposits. The goal of the study is to describe the role of alkali and C-S-H activators on hydration of high belite cement. Analytical approach for early hydration is based on combination of isothermal calorimetry, X-ray powder diffraction in-situ, DTA-TG, FT-IR.
The Lower Cretaceous male ofLebanoculicoides daheri– belonging to the earliest lineage of biting midges (Diptera: Ceratopogonidae)
Authors: Borkent Art
Published: March 2019

Re-examination of the male biting midge ofLebanoculicoides daheriChoufani, Azar, and Nel (Diptera: Ceratopogonidae), in 127 million-year-old Lebanese amber, revealed further features and details of morphological, phylogenetic, and bionomic importance. The phylogenetic position of the fossil genusLebanoculicoidesSzadziewski as the sister group of all remaining extant and extinct Ceratopogonidae is confirmed. A revised key to all four known species of this genus is provided. A permanently erect antennal plume is hypothesised as an additional synapomorphy ofAustroconopsWirth and Lee and two Cretaceous fossil genera,MinyoheleaBorkent andArchiaustroconopsSzadziewski. The presence of a hind tibial comb and more distal row of spines is considered a synapomorphy of all Culicomorpha other than Chironomidae, with some secondary losses within this group.
An explicit formula for the pressure of box-like affine iterated function systems
Authors: Morris Ian D.
Published: March 2019

In this article we investigate the pressure function and affinity dimension for iterated function systems associated to the “box-like” self-affine fractals investigated by D.-J. Feng, Y. Wang, and J. M.‘Fraser. Combining previous results of V. Yu. Protasov, A. Käenmäki and the author we obtain an explicit formula for the pressure function which makes it straightforward to compute the affinity dimension of box-like self-affine sets. We also prove a variant of this formula which allows the computation of a modified singular value pressure function defined by J. M. Fraser. We give some explicit examples where the Hausdorff and packing dimensions of a box-like self-affine fractal may be easily computed.
Polynomial upper bound on interior Steklov nodal sets
Authors: Georgiev Bogdan , Roy-Fortin Guillaume
Published: March 2019

We study solutions of uniformly elliptic PDE with Lipschitz leading coefficients and bounded lower order coefficients. We extend previous results of A. Logunov ([9]) concerning nodal sets of harmonic functions and, in particular, prove polynomial upper bounds on interior nodal sets of Steklov eigenfunctions in terms of the corresponding eigenvalue

\lambda

.
Global and local structures of oscillatory bifurcation curves
Authors: Shibata Tetsutaro
Published: March 2019

We consider the nonlinear eigenvalue problem

\begin{align*} -u''(t) &= \lambda (u(t) + g(u(t))), \: u(t) > 0, \: t \in I := (-1,1),\\
u(\pm 1) &= 0,
\end{align*}

where

g(u) = u^p\sin(u^q)

(

0 \le p < 1

,

0 < q \le 1

) and

\lambda > 0

is a bifurcation parameter. It is known that, in this case,

\lambda

is parameterized by the maximum norm

\alpha = \Vert u_\lambda\Vert_\infty

of the solution

u_\lambda

associated with

\lambda

and is written as

\lambda = \lambda(\alpha)

. We show that the bifurcation curve

\lambda(\alpha)

intersects the line

\lambda = \pi^2/4

infinitely many times by establishing the precise asymptotic formula for

\lambda(\alpha)

as

\alpha \to \infty

and

\alpha \to 0

. We find that, according to the relationship between

p

and

q

, there exist three types of bifurcation curves.
Un modelo de oferta y demanda con incertidumbre
Authors: Burgos Simón Clara , Cortés López Juan Carlos , Martínez Rodríguez David , Navarro Quiles Ana , Villanueva Micó Rafael Jacinto
Published: March 2019

El modelo lineal estático de oferta y demanda es uno de los modelos fundamentales que se estudia en la asignatura de Microeconomía del Grado de Administración y Dirección de Empresas y en otras titulaciones afines. Los estudiantes de estas titulaciones cursan simultáneamente asignaturas de Matemáticas y de Estadística, donde se presentan herramientas determinísticas y estocásticas, respectivamente, que tienen gran aplicabilidad en los modelos que aparecen en Economía. El trabajo que se presenta proporciona un ejemplo sencillo para trabajar de forma multidisciplinar las tres asignaturas anteriormente citadas. Concretamente, se propone la aleatorización del modelo lineal de oferta y demanda, considerando que los parámetros que aparecen en dicho modelo son variables aleatorias, en lugar de constantes deterministas. La motivación de esta “randomización”se basa en el hecho de que en la práctica dichos parámetros deben ajustarse a partir de muestras que contienen la incertidumbre asociada no solo a los errores del muestreo, sino también a la complejidad inherente al comportamiento de consumidor, que influye en la oferta del mercado. Utilizando técnicas de transformación de variables aleatorias, en el trabajo se determina la función de densidad de probabilidad de la funciones de oferta y demanda. Además, dado su interés, obtenemos las distribuciones del precio y de la cantidad de equilibrio del mercado. Posteriormente, los resultados teóricos previamente establecidos son aplicados en un ejemplo numérico haciendo uso de datos obtenidos sintéticamente.
Gendered Technologies of Power: Experiencing and unmaking borderscapes in South Asia
Authors: Bhattacharjee Shikha Silliman
Published: March 2019

Across South Asia, women migrate for employment within their home countries, within the region, and to more distant destination countries. Despite regular and ongoing transit, they are subject to restrictions on their mobility. How do migrant women workers confront and resist these restrictions? This question calls for an analytical approach that considers both the nature of the restrictive forces they confront and the resistance strategies they bring to bear. Scholarship on governmentality traces how nation states, as sovereigns, deploy a dual system of thought and management to exert control over populations and the nations they inhabit. Gendered migration governance at the legal and policy level maps one of many forces that restrict women’s mobility across the region. Within South Asia, social control over women is informed by not only legal, but also political, cultural, and ideological discourses that are anchored in patriarchal social systems. Women workers migrate through varied “borderscapes,” landscapes traversed by competing discourses and practices that seek to define parameters of mobility (Rajaram and Grundy-Warr 2007). Based on fieldwork conducted between October 2015 and July 2016, this paper considers how local, national, and regional networks of migrant women in South Asia circumvent restrictive policies and resist patriarchal binaries. Examining their modes of resistance, this study lends critical insight into how gendered technologies of power are experienced and unmade.
Housing is Essential: A Commonsense Paradigm Shift to Solve the Urban Displacement and Racial Injustice Crisis
Authors: Lin Margaretta , Lindheim Daniel , Eshe-Smith Minkah
Published: March 2019

This article addresses one of the biggest tests of our society: the urban displacement and racial injustice crisis. Today’s urban displacement crisis has reached a social change tipping point, but most solutions being advanced fail to prevent immediate displacement. This article debunks the prevailing strategies focused on building more market rate or affordable housing units as being able to effectively prevent displacement. It examines the impacts of urban displacement on the collective self-interest to advance climate change and racial equity. Lastly, the article provides an alternative vision for a paradigm shift based upon an understanding that housing is essential to public goods like clean air, clean water, and K-12 education. California and Oakland, California are used as case studies since they are the epicenter of the national housing unaffordability crisis and because of the authors’ work as policy change practitioners designing and implementing anti-displacement solutions in these communities.
Aspectos jurídicos da participação da União Europeia na OMC: compreendendo sutilezas de um delicado enlace
Authors: Capucio Camilla
Published: March 2019

O presente trabalho busca analisar a participação da União Europeia na Organização Mundial do Comércio, contextualizando as condições jurídicas de sua vinculação como membro em status próprio, bem como evidenciando as complexidades oriundas de sua participação no sistema de solução de controvérsias da OMC. Para alcançar tais objetivos, foram consultadas fontes primárias (tratados da União Europeia) e secundárias (jurisprudência do Tribunal de Justiça da União Europeia), revisitadas criticamente pela doutrina especializada. O trabalho parte de noções introdutórias, buscando abordar algumas imprecisões jurídicas que compõem o delicado arranjo que permite a participação da União Europeia como membro da OMC. O trabalho aborda um problema teórico pouco analisada, pois situa-se em tema de convergência entre diferentes áreas (Direito Internacional Econômico, Direito Comunitário ou da União Europeia), sendo assunto especialmente inovador na doutrina brasileira, e nisso consiste sua principal contribuição.
Julgados da corte interamericana sobre casos brasileiros e políticas públicas : reflexões acerca de possíveis influições
Authors: Moura Rafael Osvaldo Machado
Published: March 2019

À luz de noções de políticas públicas, o vertente trabalho analisa o papel desempenhado pela Corte Interamericana de Direitos Humanos em relação ao Estado brasileiro. O Tribunal Interamericano tem competência para interpretar e aplicar por último as disposições da Convenção Americana de Direitos Humanos e de outros tratados regionais, a fim de evitar e/ou reparar violações a direitos e garantias previstos em âmbito regional, exercendo, assim, funções de controle de convencionalidade sobre a conduta das instituições públicas nacionais. O problema que este artigo se propõe a responder é: tem a Corte Interamericana interferido na criação e/ou modificação de políticas públicas a serem implementadas no Brasil? Em caso positivo, este trabalho classificará os mencionados julgados da Corte Interamericana, a partir de diretrizes conceituais, da tipologia e do ciclo das políticas públicas.