bluuebunny/crossref_metadata_2025 huggingface dataset:
Statistical Characterization of Hot Jupiter Atmospheres Using Spitzer’s Secondary Eclipses
Authors: Garhart Emily , Deming Drake , Mandell Avi , Knutson Heather A. , Wallack Nicole , Burrows Adam , Fortney Jonathan J. , Hood Callie , Seay Christopher , Sing David K. , Benneke Björn , Fraine Jonathan D. , Kataria Tiffany , Lewis Nikole , Madhusudhan Nikku , McCullough Peter , Stevenson Kevin B. , Wakeford Hannah
Published: February 2020

We report 78 secondary eclipse depths for a sample of 36 transiting hot Jupiters observed at 3.6 and 4.5 μm using the Spitzer Space Telescope. Our eclipse results for 27 of these planets are new, and include highly irradiated worlds such as KELT-7b, WASP-87b, WASP-76b, and WASP-64b, and important targets for James Webb Space Telescope such as WASP-62b. We find that WASP-62b has a slightly eccentric orbit (

), and we confirm the eccentricity of HAT-P-13b and WASP-14b. The remainder are individually consistent with circular orbits, but we find statistical evidence for eccentricity increasing with orbital period in our range from 1 to 5 days. Our day-side brightness temperatures for the planets yield information on albedo and heat redistribution, following Cowan & Agol (2011). Planets having maximum day-side temperatures exceeding ∼2200 K are consistent with having zero albedo and a distribution of stellar irradiance uniformly over the day-side hemisphere. Our most intriguing result is that we detect a systematic difference between the emergent spectra of these hot Jupiters as compared to blackbodies. The ratio of observed brightness temperatures, Tb(4.5)/Tb(3.6), increases with equilibrium temperature by 100 ± 24 parts-per-million per Kelvin, over the entire temperature range in our sample (800–2500 K). No existing model predicts this trend over such a large range of temperature. We suggest that this may be due to a structural difference in the atmospheric temperature profiles of real planetary atmospheres as compared to models.
Evidence for Transparency and Clumps in the Circumbinary Ring of the T Tauri Star V582 Mon (KH 15D)
Authors: García Soto Aylin , Ali Aleezah , Newmark Amanda , Herbst William , Windemuth Diana , Winn Joshua N.
Published: February 2020

The binary T Tauri star V582 Mon (KH 15D) is surrounded by a tilted and nodally precessing ring of dusty material, which has caused periodic occultations of one or both stars over the last 50 years. Here, we present multi-color time-series photometry (VRIJHK) throughout the 2017/2018 observing season, when the ring was covering the entire orbit of star A and gradually exposing the orbit of star B. We calculate the mean apparent magnitude of star B to be I = 14.08. Besides the periodic eclipses of star B due to its orbital motion, we observed unexpected dips in brightness indicative of partially transparent stellar-sized clumps within the ring. The wavelength dependence of these events is suggestive of extinction by dust grains significantly larger than typical interstellar dust grains. The photometric variability observed while star B is being uncovered by the trailing edge of the ring is not simply the time reversal of the behavior seen when star A was being covered by the leading edge. Whereas the leading edge appeared to be very sharply defined, the trailing edge is “clumpy” and “fuzzy” (transparent), with a more gradual transition in opacity. The clumpiness and transparency of the occulting material provide a unique opportunity to study the properties of dust grains in a likely planet-forming zone.
Le temps des « peuples autochtones »
Authors: Gaulme François
Published: February 2020

Le thème des « peuples autochtones » prend de plus en plus d’importance dans un monde qui se préoccupe toujours davantage de l’environnement naturel. La situation de l’Amazonie est à ce propos emblématique, du fait de l’attitude du Président brésilien. Les instances des Nations unies reconnaissent les droits propres de ces peuples, mais de nombreux pays n’ont pas ratifié les conventions qui s’y rapportent. La position de la France reste encore très timide, en raison de sa difficulté à reconnaître les particularités de ces populations.
Retraites : une réforme mal préparée et peu urgente
Authors: Le Bras Hervé
Published: February 2020

En France, de nombreux aspects des retraites peuvent être améliorés et beaucoup de petites injustices existent. Un chauffeur de bus à Bordeaux n’a pas les mêmes avantages qu’à Paris. Ce n’est pas une raison pour tout chambouler, ni pour crier au loup et à l’urgence d’une réforme comme s’il fallait prévenir une prochaine catastrophe dont on va montrer qu’elle ne s’annonce pas.
On tue une femme
Authors: Cassan Margaux
Published: February 2020

Sur les murs de la capitale et dans les médias, on voit apparaître le nouveau terme de « féminicide », avec la volonté politique de l’inscrire dans le Code pénal. Or, l’usage et l’utilité de ce terme ne vont pas de soi. Est-ce qu’il éclaire les ressorts spécifiques d’une violence sexiste ? Peut-on qualifier de « féminicide » tout meurtre de femme ? Quel peut être l’apport de la réflexion philosophique sur notre perception de ces violences ?
« Le roman peut tout faire »
Authors: Toussaint Jean-Philippe , Mannooretonil Agnès
Published: February 2020

Jean-Philippe Toussaint revient sur le « grand livre d’inquiétude » qu’est son dernier roman, dont l’écriture a été travaillée par nos angoisses les plus contemporaines : la puissance de la Chine, l’avenir de l’Europe, les nouvelles technologies et des inquiétudes plus intimes. Instrument essentiel pour observer le monde, la création romanesque est aussi bien plus que cela : un travail, un flambeau à transmettre, un risque à partager.
Penser la prison politique en Afrique
Authors: Deslaurier Christine
Published: February 2020

L’association des mots prison et politique en Afrique renvoie souvent à l’image archétypale du prisonnier politique victime de l’arbitraire de régimes postcoloniaux autoritaires. À partir de la réinscription de cette catégorie dans ses temporalités historiques et de l’analyse de ses déclinaisons juridiques, pratiques et imaginaires, cet article propose de réfléchir à la notion de prison politique à travers divers exemples et situations sur le continent pour en élargir la compréhension. En observant ce que la et le politique font à la prison, mais aussi ce que la prison produit de politique derrière ses murs, il s’agit d’explorer le lien intrinsèque entre ces deux termes, dans ses aspects les plus visibles comme dans ses dimensions plus implicites.
Pour une économie de la valeur en prison
Authors: Le Marcis Frédéric , Faye Sylvain Landry Birane
Published: February 2020

Les prisons sur le continent africain véhiculent un imaginaire de violence, de corruption et de manque. Comment dépasser cette simple exposition et comprendre les logiques qui structurent la vie en prison ? Nous proposons ici, en nous fondant sur des ethnographies menées à l’échelle du continent, de discuter la notion d’économie des valeurs. Pratiques, notions, interactions apparaissent en effet informées par les acteurs, c’est-à-dire chargées de significations et d’intentionnalités – des valeurs – en fonction de contextes (historiques et contemporains) et d’enjeux de pouvoir qui s’articulent de manière dynamique. Après avoir discuté de l’imposition de l’ordre carcéral et des pouvoirs qui le structurent, nous verrons comment statuts et pouvoirs se traduisent dans l’espace. Nous verrons en quoi la notion de vision, entendue dans sa double dimension (active et passive), est centrale dans l’expression du pouvoir. L’économie des valeurs relative à ces structures de pouvoir se traduit dans des transactions qui seront discutées. Dans un autre ordre d’idée, mais selon une logique parallèle, les valeurs multiples qui structurent la pratique religieuse seront également examinées. La notion d’économie des valeurs permet de saisir la grammaire de la forme de vie observable en prison en tant que réalité co-construite par ses différents acteurs et de tenir compte des circulations entre dedans et dehors. La notion révèle ainsi la co-présence de multiples logiques qui structurent le gouvernement formel et informel des populations en prison.
Passeurs de murs. Pour une socio-anthropologie des réformateurs des prisons africaines
Authors: Bouagga Yasmine
Published: February 2020

Partout sur le continent africain se répètent les dénonciations de conditions de détention indignes, de surpopulation dramatique, d’usage abusif de la détention, de mauvais traitements infligés aux prisonniers. Face à ces constats accablants, une diversité de réformateurs interviennent, au nom d’un corpus de normes communes et mobilisant des « modèles voyageurs ». Toutefois, leurs activités, inspirées par les droits humains, l’efficacité administrative ou la sécurité, ont des orientations diverses et font l’objet d’adaptations contrastées, au gré d’enjeux locaux. En s’appuyant sur une approche de socio-anthropologie de l’action publique, on déconstruira la notion de réforme, montrant en quoi la notion est ambiguë. En effet, ses différents acteurs peuvent agir en « passeurs de murs », ouvrant la prison sur l’extérieur mais aussi introduisant de nouvelles techniques de contrôle, sans nécessairement transformer plus largement le système de la pénalité. Pourtant, loin de conclure à l’immobilisme, on soulignera le rôle des réformateurs discrets, qui, dans l’ombre des experts professionnels de la réforme pénitentiaire, mettent en œuvre des changements modestes.
Les groupes cultist nigerians et la traite des êtres humains
Authors: Lavaud-Legendre Bénédicte , Plessard Cécile
Published: March 2020

Le processus criminel rendant possible l'exploitation sexuelle de femmes nigérianes est souvent abordé sous l'angle de la relation entre celle qui migre et celle qui rend possible cette migration. Cette relation est fréquemment scellée dans le cadre d'un serment d'allégeance, couramment désigné par le terme générique juju . C'est autour de ce serment que s'organisent les liens entre la madam - nom donné aux proxénètes nigérianes - et celle qui se prostitue. Pourtant, les travaux menés ces dernières années ont permis de mesurer que l'on ne pouvait réduire la relation d'exploitation au lien entre l'auteur et la victime. Les individus qui prennent part à la traite des êtres humains s'inscrivent dans un groupe autonome ayant ses propres normes et formes d'organisation sociale. On qualifiera ce groupe de « groupe d'exploitation ». Au sein de ce groupe d'exploitation, certains individus sont affiliés aux cultist, groupes criminels nigérians dont l'existence est autonome par rapport à l'activité de traite. Leur rôle exact dans le processus d'exploitation est encore difficile à définir précisément. Pourtant, leur place croissante dans cette pratique criminelle et l'extrême violence de leurs pratiques obligent à identifier plus précisément la nature exacte de leur implication.
La date au CP
Authors: Leclaire-Halté Anne , Gremmo Marie-José
Published: February 2020

« Faire la date » n’apparaît pas dans les prescriptions institutionnelles pour le cours préparatoire mais il s’agit d’un moment qui est néanmoins souvent mis en place dans les classes. L’article propose une description de la façon dont ce moment de la date se déroule dans 5 classes de CP. Il s’appuie pour cela sur un corpus de films de classe issus de la recherche LirécrireCP (2013-2016). Il montre d’abord en quoi il s’agit d’un temps fortement ritualisé, comme souvent en maternelle, en s’appuyant sur le moment de la journée et le lieu où il se déroule, sur le matériel mis en place à cette occasion, sur le discours et les actions et de l’enseignant et des élèves. Il revient aussi sur une dimension non négligeable de ce moment : son rôle dans certains apprentissages, en particulier en français et en mathématiques, ainsi que sa fonction dans le développement de l’autonomie des élèves.
L’explicitation a-t-elle une influence positive sur l’apprentissage du lire-écrire au CP ?
Authors: Gremmo Marie-José , Leclaire-Halté Anne , Kreza Maria , Crinon Jacques
Published: February 2020

Cet article s’intéresse aux effets de l’explicitation enseignante sur les apprentissages du lire-écrire dans des CP caractérisés par le milieu social défavorisé de leurs élèves. Pour ce faire, il compare les classes d’un corpus constitué à partir des résultats de la recherche Lirécrire CP . Ce corpus est formé de quatre classes jugées, selon cette recherche, efficaces et de quatre classes jugées moins efficaces dans l’enseignement-apprentissage du lire-écrire. La comparaison entre les deux groupes de classes s’effectue à l’aide d’une grille d’analyse élaborée par les auteurs et porte successivement sur le volume et la fréquence des explicitations ainsi que leurs occurrences selon le type de tâches, sur les éléments privilégiés dans ces explicitations, sur le recours à un lexique spécifique et à certains artéfacts scolaires, pour enfin se pencher sur la question de la pertinence des explicitations.
Deconstructing the Seven Cs of Social Media: A Summative Perspective
Authors: Rautela Sonica , Singhal Tarun Kumar
Published: February 2020

One of the defining technological forces which are reshaping world today is the easy accessibility to the Internet. The Internet has changed the way people communicate with each other. Social media whose development was first marshaled by Web 2.0, has revolutionized the entire world of communication. The most intriguing fact is that the world of social media is constantly changing. The platforms which are topping the charts today may not be tomorrow. Also, it can be observed that the power has shifted from the hands of marketers to the hands of users which in turn have empowered users. The objective of the present study is to explore the different facets of social media in detail. These facets form the base for the world of social media and can be referred to as the 7 Cs of social media. These seven Cs are - content, community, conversation, capital (social), culture, collaboration, and conversion respectively. With an enhanced understanding of all these Cs of social media, the study proposes a conceptual model depicting the relationship between these seven Cs and social media. Companies should analyze each of these Cs in detail and design their social media strategies accordingly. This will not only assure the efficient and effective use of social media but also will help managers to decide where and how to allot firm resources in a better fashion.
À l’orée d’une enquête : images peintes et lieux de culte des ordres militaires dans l’espace français
Authors: Carraz Damien
Published: February 2020

Ce rapport introductif pointe d’abord les cloisonnements historiographiques qui ont conduit des spécialistes à aborder la spiritualité et la liturgie des ordres militaires sans même soupçonner la richesse des images attestées dans l’environnement des commanderies. De leur côté, bien des études menées par les historiens de l’art sur des ensembles peints conservés dans les chapelles conventuelles faisaient fi du contexte historique et, surtout, des caractéristiques mêmes du monachisme militaire.À l’échelle de la France actuelle, on propose ensuite un rapide bilan du corpus iconographique, attesté entre le xiie et le début du xive siècle, pour les églises du Temple et de l’Hôpital. Une question latente, à laquelle la suite de l’ouvrage apporte un certain nombre de réponses, est de savoir si ces lieux d’images ont présenté des spécificités liées à l’originalité de la vie régulière qui était suivie au sein des commanderies. En d’autres termes, les ordres militaires portent-ils une culture visuelle ou bien une pensée figurative propres ?
ER Stress Signaling in Alzheimer's Disease
Authors: Rahman Md. Motiar , Shrestha Looniva , Gulshan Mst Ara
Published: March 2020

Alzheimer's disease (AD) is the most common etiology of dementia amongst aged individuals and a principal public health-related abnormality. It is considered as a multifactorial disorder, with no particular origin identified, and also some modifiable, as well as non-modifiable threats are correlated with its progression and development. The endoplasmic reticulum (ER) stress response is considered as a key process in the pathogenesis of AD. In this chapter, the authors present a summary of related transmembrane kinase proteins responsible for the onset of AD as well as show the interrelationship between ER stress and AD. Finally, the authors demonstrate the therapeutics intervention for AD diagnosis by highlighting the current practices to advance novel therapies.
Using Action Research for Improvement of Project Knowledge Management in the Public Museum
Authors: Brodzińska Kamila , Szostak Agnieszka , Jałocha Beata
Published: March 2020

This chapter aims at presenting the results of the research carried out as part of the action research project concerning knowledge management and knowledge sharing in a public institution. As a research subject, a public cultural institution in Poland was selected. The methods used during the implementation of the research include observations, interviews, questionnaire surveys, and document analysis. The chapter presents the course of the research process, a diagnosis of problems, and challenges of the institution under study as regards project knowledge management, analysis of results, and recommendations. The principal result of the study is the developed action plan that contains an overview description of the proposed change and suggestions for solutions for the diagnosed challenge. It also illustrated that action research is a research approach supporting project management processes in public organizations. The theoretical background for considerations undertaken in the work are the concepts of project knowledge management and sharing knowledge on the implemented projects.
The Structure of the Polytope of Hereditary Information
Authors: Zhizhin Gennadiy Vladimirovich
Published: February 2020

The representations of the sugar molecule and the residue of phosphoric acid in the form of polytopes of higher dimension are used. Based on these ideas and their simplified three-dimensional images, a three-dimensional image of nucleic acids is constructed. The geometry of the neighborhood of the compound of two nucleic acid helices with nitrogen bases has been investigated in detail. It is proved that this neighborhood is a cross-polytope of dimension 13 (polytope of hereditary information), in the coordinate planes of which there are complementary hydrogen bonds of nitrogenous bases. The structure of this polytope is defined, and its image is given. The total incident flows from the low-dimensional elements to the higher-dimensional elements and vice versa of the hereditary information polytope are calculated equal to each other. High values of these flows indicate a high intensity of information exchange in the polytope of hereditary information that ensures the transfer of this information.
Predictive Analytical Model for Microblogging Data Using Asset Bubble Modelling
Authors: Hiriyannaiah Srinidhi , Siddesh G.M.  , Srinivasa K.G.
Published: February 2020

In recent days, social media plays a significant role in the ecosystem of the big data world and its different types of information. There is an emerging need for collection, monitoring, analyzing, and visualizing the different information from various social media platforms in different domains like businesses, public administration, and others. Social media acts as the representative with numerous microblogs for analytics. Predictive analytics of such microblogs provides insights into various aspects of the real-world entities. In this article, a predictive model is proposed using the tweets generated on Twitter social media. The proposed model calculates the potential of a topic in the tweets for the prediction purposes. The experiments were conducted on tweets of the regional election in India and the results are better than the existing systems. In the future, the model can be extended for analysis of information diffusion in heterogeneous systems.
Determining Antecedents of Intention to Adopt Goods and Service Tax Network
Authors: Guleria Navneet
Published: February 2020

With the changing worldwide economic scenario, there occurs a need to structure new tax reforms especially for a developing country like India. With this ideation, the Indian government introduced the goods and service tax (GST) in order to conceptualise a common tax system. However, with digitalization transforming every service from offline to online mode, the government developed a not-for-profit website, GST network (GSTN), where citizens can smoothly and securely file their returns. Since the concept is new, studying the GSTN adoption by considering technology acceptance model (TAM) and unified theory of adoption and use of technology (UTAUT) variables becomes a novel approach. The article considers perceived ease of use, perceived usefulness, perceived risk, social influence, and facilitating conditions as exogenous variables whereas intention to adopt GSTN is considered as endogenous one. A partial least square (PLS) path modelling approach is applied on a survey data in order to validate the hypothesised model.
Segmentation and Ranking of Online Reviewer Community
Authors: Aakash Aakash , Jaiswal Ajay
Published: February 2020

Online reviewer societies flourish on contributions from different reviewers, who display a wavering engagement behavior. Effort has been made in the e-marketing literature for segmenting individuals with the help of their engagement behavior. In this study, the authors segment the reviewers of a popular travel website (TripAdvisor) through k-means clustering based on three dimensions (F-frequency, H-helpfulness, R-recency), resulting in four different reviewer segments-valuable, trustworthy, new and valueless. The authors calculate the reviewer value using fuzzy AHP and then rank the reviewer segment accordingly. The authors find that the valuable reviewers, who post eWOM regularly and get greater helpful votes by eWOM readers, are the most important. Surprisingly, the trustworthy, who also get more helpful votes with higher eWOM volume, but not posting any review recently, are the second most important. This research is a novel effort on reviewer segmentation and gives valuable insights to e-marketers.
A Set of Usability Heuristics and Design Recommendations for Higher Education Institutions' Websites
Authors: Singla Bhim Sain , Aggarwal Himanshu
Published: February 2020

Usability evaluation of a website is a key element in identifying the areas where the end-users might experience problems while interacting with it. The usability parameter has a great impact on the performance of a website, an organization's image, user satisfaction, and their intention to revisit the site. In the recent past, there has been a tremendous increase in the use of websites for seeking requisite information about admission to various courses offered by higher education institutions. There has been a lack of an effective and efficient set of heuristics that can be used to evaluate the usability of these education institution websites. The present study differs from earlier studies by providing a new set of 43 usability heuristics and categorizing them into eight distinct factors on the basis of their empirical validation. These eight identified factors exhibit strong psychometric properties and are ease of navigation, design quality, information architecture, credibility, functionality quality, content quality, simplicity, and learnability. The findings of this study are highly useful for the website designers and evaluators of higher education institutions' websites, who are concerned with evaluating and improving the usability of these websites. The findings of this study have theoretical as well as practical implications.
Software-Based Validation of the Differentiation Scheme for Ethernet and Wireless LAN Access Network Types Using an End-to-End Approach
Authors: Parwekar Pritee , Bakambekova Adilya , Bizhigit Talgat , Toleubay Yeldar
Published: February 2020

Different access network types are characterized by a variety of attributes which include link bandwidths, physical media, capacity, and reliability. Therefore, the question of accurately identifying whether the sender uses a wired ethernet connection or a wireless LAN connection comes into place. This article aims to analyse, simulate, validate, and improve the existing classification scheme which is based on measuring entropy of packet pair inter-arrival times and median. A riverbed modeller (former OPNET) is used for simulating the different scenarios. Small-scale experiment conducted on campus at the Nazarbayev University (NU) validates the insignificance of the packet probe size chosen for the classification.
CEO Turnover, Network Effects, and Firm Performance
Authors: Sun Yanan , Zhang Peiqin , Wierschem David , Mediavilla Francis A Mendez
Published: February 2020

This article applies network and organizational theory to examine the effect of CEO turnover on firm accounting and market performance in both short-term and long-term. In addition, this research investigates the moderating role of network effects using cluster analysis. Using a system generalized method of moments (GMM) estimation of panel data obtained from Compustat and S&P's Execucomp database, this study finds that it is less likely to have superior performance in the long-term for firms with frequent CEO turnover. While it is more likely to have better accounting performance over the short-term, but less likely to have superior market performance. This study further validates the moderating role of network effects. This article contributes to the research by providing new insights of CEO turnover effects on firm performance and investigating the moderation effect of network structure. The findings also provide practical suggestions for firms that experience frequent changes of their CEOs.
Practical Implications On How Established Companies Innovate With Startups
Authors: Back Andrea , Werro Tina M , Peter Lukas M
Published: February 2020

The study addresses an important literature gap concerning open innovation and startups. The purpose of this article is to deliver tools and guidelines for innovation managers to support their decision-making when aspiring to openly innovate with startups. The study proposes five spectra that show the variance across different collaboration on the following parameters for analysis: 1) investment required; 2) risk level; 3) corporate control; 4) Startup support; 5) ecosystem leverage. The article arrives at a simple weighted decision matrix to be used as a decision-guiding tool in determining the best choice of a startup-collaboration option from a corporate perspective. The research builds on a framework of references to previous literature and follows an explorative approach based on field research and design science research.
Managing and Applying Innovation in New Product Development - Strategies and Initiatives
Authors: Mandal Pratap Chandra
Published: February 2020

Companies require introducing new products in the market and manage product innovation properly to remain ahead in the competition. Innovative firms should adopt a customer-centered approach towards managing innovation. They require understanding individual differences of customers in their readiness to accept innovation and roles of product characteristics in adoption of innovation among customers. Managing innovation requires collaboration and proper coordination. Top management support is imperative for new product development. Firms should adopt an approach of team-based innovation. Also, firms should handle innovation in a systematic rather than in a haphazard manner. Innovative companies should also consider opportunities during turbulent times and invest wisely to utilize those opportunities. Firms may also benefit by targeting individuals at the bottom of the pyramid with innovation. Companies require considering all these approaches towards managing innovation in new product development to perform and excel in the competition.
Real Time Entry Prohibition System for Coalmines
Authors: Shrawankar Urmila , Neware Rahul , Mangulkar Pranay
Published: February 2020

This article focuses on the hazardous conditions prevailing in underground coal mines and the decision to prohibit entry, when conditions are adverse. Thus, the ongoing observation framework is helpful for ascertaining the conditions for working in underground coal mines and for essential safety and well-being measures. The advancements in WSN lead to advancements in wireless communications. The various sensors are deployed at the location and sense the environment and provide recent activities of the underground coal mines. The sensors transmit the procured information to the base station, principally the A-D transformation. The sensors can be considered a hub to the base station. Wireless transmission is used to send the data to the user. The designed hardware and software systems are used for the identification of the parameters and as per the thresholds, the decision and the prohibition of workers before entering into the mine is decided. The ML system helps in checking the favorable conditions for working in underground mines. While experimenting, real-time sensor generated data is used.
Ooredoo Rayek
Authors: Klouche Badia , Benslimane Sidi Mohamed , Bennabi Sakina Rim
Published: February 2020

Sentiment analysis is one of the recent areas of emerging research in the classification of sentiment polarity and text mining, particularly with the considerable number of opinions available on social media. The Algerian Operator Telephone Ooredoo, as other operators, deploys in its new strategy to conquer new customers, by exploiting their opinions through a sentiments analysis. The purpose of this work is to set up a system called “Ooredoo Rayek”, whose objective is to collect, transliterate, translate and classify the textual data expressed by the Ooredoo operator's customers. This article developed a set of rules allowing the transliteration from Algerian Arabizi to Algerian dialect. Furthermore, the authors used Naïve Bayes (NB) and (Support Vector Machine) SVM classifiers to assign polarity tags to Facebook comments from the official pages of Ooredoo written in multilingual and multi-dialect context. Experimental results show that the system obtains good performance with 83% of accuracy.
WPS Design of Dissimilar Metal Welds between Austenitic Stainless Steel and Carbon Steel for Building Thermal Power Plants
Authors: Thang Nguyen Duc , The Trinh Van , Duc Nguyen Van
Published: February 2020

Dissimilar metal welding (DMW) is frequently used to join stainless steels to other metals in Thermal Power Plants (TPP) and industries. DMW process has been shown to have great advantages for many years. This approach is most often used where a transition in mechanical properties and/or performance in service are required. The objective of this research is to review the basic principles of fusion welding of dissimilar metals.In experiments, the two seamless pipes with 18 mm thick, one modified SS 304L austenitic stainless steel was welded to another modified carbon steel A 106B by means of shielded metal arc (SMAW) and gas tungsten arc (GTAW) welding processes using ER309L and E 309L-16 type of filler metal. Before welding, essential variables were analysed so that creating preliminary welding procedure specifications (pWPS). After welding, weldment was tested by NDT such as visual, penetrant and radiography. Microstructural examinations were carried out including macro and micrographs, grain size analysis, and hardness measurements. Transverse tensile, and face/ root bend testing were carried out. Finally, WPS was established conformance to standards of TPP structure toward to building Nuclear Power Plant in Vietnam.
Inspection and Repair Quality Plan of Regeneration Gas Heater
Authors: Jaric Marko , Petronic Sanja , Budimir Nikola , Bîrdeanu Aurel Valentin , Tadic Srdajn
Published: February 2020

Gas heaters used in oil and petrol industry transfer heat to the produced gas stream. Heaters are especially used when producing natural gas or condensate to avoid the formation of ice and gas hydrates. In this work, the inspection practices for process heaters used in petroleum refineries and petrochemical plants is presented as well as critical places for crack formation. After the inspection of the Regeneration Gas Heater the cracks were found and immediately repaired. The inspection is performed using visual, liquid penetrant and ultrasonic testing. The inspection and plan repair by welding is covered according to API 573:2013 and ASME IX:2017. In this work, the results before and after repair are presented and discussed.
Investigating the Causes of Destruction of a Crankshaft
Authors: Binchiciu Horia , Pascu Romulus , Geantă Victor , Binchiciu Emilia-Florina
Published: February 2020

The paper presents studies carried out in order to determine the causes of destruction, by cracking, of a crankshaft from the composition of a tractor used to process soil.Experiments were carried out in two directions, namely a step by step study on the degraded area and a investigation into the operating conditions of the machine, on that specific work cycle.The degraded shaft was investigated visually at a magnification of 10x and by hardness tests on the areas with embrittlement cracking.Hardness test enfolded large variations (in hardness), of up to 40%, leading to a high sensitivity to cracking by mechanical fatigue, induced by the structural tension concentrators. However, hardness examination did not reveal areas of shaft degradation due to fatigue, which determined us to study the operating conditions. The shaft cracking occurred during soil processing, using a multilayered plow and in difficult exploitation conditions.Variations of mechanical characteristics of soils in the area of ​​operation of the machine, is relatively large, fact which corroborated with the lack of safety elements when overloaded, of the endowment of the tractor-plow system, led to the overcoming of the permissible load, which on a background of high hardness material, determined the embrittlement cracking of the crankshaft. Research performed highlighted, for the area in which the machine activates, the necessity of introducing in the power-generating system of safety and protection elements to prevent the destruction of components.
Researches on Manufacturing Deo Roll Balls by Infrared Radiation Welding
Authors: Teusdea Dan Florin , Sîrbu Nicuşor Alin , Vodă Mircea , Oancă Octavian Victor , Lovasz Erwin Christian
Published: February 2020

The paper proposes the analysis of an alternative technology for manufacturing deodorant roll-on balls of polypropylene. With the current extrusion-blowing technology, the manufacturing of these balls results in an uneven wall thicknesses and a large technological runner of material that needs to be grinded and reintroduced into the injection equipment, which involves additional raw material and energy consumption.The proposed alternate method of manufacturing these balls (as spherical objects) is to form the ball from two ball halves joined together by infrared radiation welding. This process will result in significant savings in raw materials and energy.Further improvements of dimensional capabilities and control of welding parameters are required prior the transfer on high productivity manufacturing lines. Additionally, this technology can be assimilated into other applications where hollow balls of plastic are used.
Considerations on the Ultimate Tensile Strength of Butt Welds of the EN AW 5754 Aluminium Alloy, Made by Friction Stir Welding (FSW)
Authors: Verbiţchi Victor , Cojocaru Radu , Botila Lia-Nicoleta , Ciucă Cristian , Perianu Ion Aurel
Published: February 2020

Experiments have been performed for the butt welding of 160 mm x 90 mm x 2 mm sheets of EN AW 5754 aluminium alloy, where the friction stir welding (FSW) has been used.Referring to the parent metal, the chemical composition and the form of wrought products of the aluminium alloy EN AW 5754 is presented, according to the standard EN 573-1:2005, respectively EN 573-3:2013. The mechanical properties of EN AW-5754 (Al Mg3) sheets are presented, according to EN 485-2:2016. The experiments have been conducted on the own equipment for friction stir welding, type FSW-4kW-10kN, to execute 8 (eight) FSW test pieces, according to EN ISO 25239-4. A quenched FSW tool, own-made of C 45 grade steel, EN 10083, has been used. The parameters of the FSW tests are shown. As main parameters, the rotational speed of the FSW tool was in the range n = 800 – 1200 rev/min, respectively the travel speed was in the range v = 50 – 200 mm/min. The run of the joining experiments is described and the joining test pieces are presented in figures. The ultimate tensile strength of the parent metal (σmin,pm) is based on the specified minimum tensile strength of the ”O” condition of the parent material, respectively this value is also required for the weld, that is σmin,w = 190 MPa. The specimens T1.0, T1.1, T2.1, T2.2, T3.1, T3.2, T4.1, T4.2, T5.1, T5.2 și T6.1 are adequate and accepted by this tensile test. The specimens T1.2, T6.2, T7.1, T72. and T8.1 can be accepted, if higher properties are achieved with a full postweld treatment. Another possibility is a lower extent of the minimum tensile strength of the weld that shall be in accordance with another design specification, for example σmin,w = 145 MPa. By the correlation of the FSW parameters with the results of the tensile test, the ranges for the main parameters with adequate values of the ultimate tensile strength are established: n = 800 – 1000 rev/min and v = 50 – 100 mm/min. By the conclusions, the main aspects of the execution of the FSW test pieces, as well as the results of the tensile tests are selected. The involved industrial areas of the applications are: electro-technique, electronics, manufacturing, shipbuilding and automotive industries. The FSW process is ecological, because it neither uses, nor produces hazardous substances. The references consist of 12 titles.
Researches on Manufacturing Deo Roll Balls by Ultrasonic Welding
Authors: Teusdea Dan Florin , Oancă Octavian Victor , Vodă Mircea , Sîrbu Nicuşor Alin , Lovasz Erwin Christian
Published: February 2020

Ultrasonic welding is a fast and economical solution for plastic parts. This article proposes Ultrasonic Welding as an alternative technology for manufacturing deodorant roll-on plastic balls. With the current technology, the manufacturing of these balls results in an uneven wall thicknesses and a large technological runner of material that needs to be grinded and reintroduced into the injection equipment.The proposed method of manufacturing these deodorant balls is to form the ball from two ball halves joined together by ultrasonic welding. This process will result in significant savings in raw materials and energy.Further improvements of welding parameters and dimensions are required prior the transfer on high productivity manufacturing lines. This technology can be assimilated into other applications where hollow balls of plastic are used.
Simulation and Experimental Based Analysis of the Laser Beam Welding of DP Steels
Authors: Sisodia Raghawendra Pratap Singh , Gáspár Marcell , Fodor Béla , Draskóczi László
Published: February 2020

In this paper, heat affected zone characteristics of DP1000 steels was investigated during diode laser beam welding (LBW). A butt-welded joint of specimen in dimension of 300 x 150 mm each (according to EN15614-11:2002) with 1 mm thickness is used for the experimental purpose. The welding thermal cycle and the cooling circumstances in the HAZ was determined by real experiment and the physical simulation. A Gleeble 3500 thermo-physical simulator was used to physically simulate the coarse grain heat affected zone (CGHAZ) on the base material specimens by the utilization of the thermal cycles for t8/5 =2.5 s. The results of the physical simulation were validated by real welding experiments. The properties of the simulated and the real HAZ was examined by optical microscopic, scanning electron microscope and hardness tests.
Rhythmic stabilisation: A new approach
Authors: Davids L. M.
Published: February 2020

No abstract available.
Regional Congress of the Commonwealth Medical Association
Authors: McFarlane Audrey A.
Published: February 2020

No abstract available.
Induction of Cardiomyogenesis in Stem Cells Isolated from Human Exfoliated Deciduous Teeth
Authors: Cheung Herman S.
Published: March 2020

Background:

The natural transition from neonatal deciduous teeth to adult permanent teeth is a physiological phenomenon. Miura et al. reported the isolation and characterization of stem cells from the pulp of human exfoliated deciduous teeth (SHED). The great majority of current stem cell therapies use human adult stem cells. Since adult stem cells are multi-potent. SHED have demonstrated to have the capability to differentiate into osteogenic and odontogenic cells, adipocytes, and neural cells. When transplanted in immunocompromised mice, SHED were able to form bone. In addition, SHED have been able to differentiate into functional odontoblast and angiogenic endothelial cells.

Aims and Objective:

There are two objectives in our study; First, we want to confirm that SHED cells differentiate into osteogenic and neurotic cells. Second, we shall also examine whether SHED stem cells can also differentiate into cardiomyocytes.

Material and Method:

SHED stem cells are subjected to cardiomyogenic, neurogenic, and osteogenic induction treatment. The treated cells are the subjected to real time PCR and mmuno-histochemical analysis. The presence of calcium deposits with Alizarin Red S staining for SHED cells treated with osteogenic media was used to confirm osteogenic differentiation.

Results:

Our study confirmed that SHED cells differentiate into osteogenic and neurotic cells. For the first time we showed that SHED cells can also differentiate into cardiomyocytes.

Conclusion:

Due to their potentials and its neural crest origin, SHED are an ideal stem cell source for tissue regeneration.
A new optical-based technique for real-time measurements of mineral dust concentration in PM10 using a virtual impactor
Authors: Drinovec Luka , Sciare Jean , Stavroulas Iasonas , Bezantakos Spiros , Pikridas Michael , Unga Florin , Savvides Chrysanthos , Višić Bojana , Remškar Maja , Močnik Griša
Published: February 2020

Abstract. Atmospheric mineral dust influences Earth’s radiative budget, cloud formation and lifetime, has adverse health effects, and affects the air quality through the increase of regulatory PM10 concentrations, making strategic its real-time quantification in the atmosphere. Only few near-real-time techniques can discriminate dust aerosol in PM10 samples and they are based on the dust chemical composition. The on-line determination of mineral dust using aerosol absorption photometers offers an interesting and competitive alternative, but remains a difficult task to achieve. This is particularly challenging when dust is mixed with black carbon, which features a much higher mass absorption cross-section. We present here for the first time a highly time resolved on-line detection technique of dust absorption by coupling a high flow virtual impactor (VI) sampler that concentrates coarse particles with an aerosol absorption photometer (Aethalometer, model AE33). The absorption of concentrated dust particles is obtained by subtracting the absorption of the submicron (PM1) aerosol fraction from the absorption of the virtual impactor sample (VI-PM1 method). This real-time method for detecting desert dust was tested in the field for a period of two months (April and May 2016) at a regional background site of Cyprus, in the Eastern Mediterranean. Several intense desert mineral dust events were observed during the field campaign with dust concentration in PM10 up to 45 μg m−3. Mineral dust was present most of the time during the campaign with an average PM10 of about 8 μg m−3. Mineral dust absorption was most prominent at short wavelengths, yielding an average mass absorption cross-section (MAC) of 0.24 ± 0.01 m2 g−1 at 370 nm and an absorption Ångström exponent of 1.41 ± 0.29. This MAC value can be used as site specific parameter for on-line determination of mineral dust concentration. The uncertainty of the proposed method is discussed by comparing and validating it with different methods.
El espacio como fuente de significación en la construcción discursiva del film 'Arsénico por compasión'
Authors: Magro Vela Silvia , Puebla Martínez Belén , Rubira García Rainer
Published: February 2020

El presente texto aborda el análisis del marco espacial en el ámbito del relato fílmico. A partir de diferentes propuestas teóricas se realiza una investigación de naturaleza hermenéutica sobre la representación del espacio, su configuración y su sentido dentro de la obra cinematográfica. El caso de estudio seleccionado es Arsénico por compasión (Arsenic and Old Lace, Frank Capra, 1944), considerada un clásico del género de la comedia. El análisis del discurso es la técnica seleccionada para conseguir los siguientes objetivos: reconocer los distintos tipos de espacio que aparecen y ayudan a la construcción del discurso fílmico en tanto unidad de sentido; reflexionar sobre el espacio como escenario, el espacio construido y el espacio significado, haciendo énfasis sobre el espacio omitido como una forma más de expresión fílmica. Por lo que el espacio se presenta como un ente vivo, dinámico, que juega un papel crucial en la construcción semántica.
Importancia del comportamiento organizacional para los estudiantes de Administración de Empresas
Authors: Sevilla Rizo Alberto
Published: March 2020

El estudio del comportamiento organizacional tiene una gran relevancia en el aprendizaje de los estudiantes de Administración de Empresas, dado que en esta área se trabaja con individuos y cada uno tiene diferente comportamiento, debido múltiples factores, sean estos de índole familiar, social, político, económicos, entre otros. Ello influirá en el desempeño de sus funciones de acuerdo a la percepción que cada uno de estos individuos tengan, y esto será del cúmulo de aprendizajes desde, en y para la vida. Así mismo, influirá en el trabajo de grupo que se realice dentro de la organización, lo que evitará o incidirá en los conflictos. Todo ello repercute en la eficiencia y eficacia de las funciones realizadas en el ámbito empresarial.
Examination of selected cleaning service equipment in the scope of airfield's movement areas maintenance
Authors: Kowalska Danuta , Wesołowski Mariusz , Pietruszewski Paweł
Published: February 2020

Maintaining airport surfaces in good condition and in a good state of cleanliness throughout the year is of extreme importance to ensure the safety of flight operations by aircraft. The use of various equipment is practicable in order to clean regularly all paved surfaces. Components of brushes and plows during operation wear out and must be replaced periodically. New elements should be of adequate quality. Examples of airport cleaners and exchangeable cleaning elements are presented. Some requirements have also been given on the brushes’ bristles. To confirm the need to control the purchased cleaning elements, the condition of worn components was checked. The results of laboratory tests of new and used brushes bristles are presented. The tests included microscopic observations, microstructure assessment, tensile strength testing, and microhardness testing. Defects in fixing the bundles of polymer brush bristles during airport exploitation were found. Research on steel wires showed a partial loss of the zinc coating during the brush operation (potential corrosion), lowering the tensile strength and increase the hardness of the wires, which could lead to wires crack and break. The article confirmed the need to control of brushes and plows parameters to ensure their proper quality. Their selected parameters should be controlled during purchase and operation on airfields belonging to the Polish Armed Forces. The impact of deicing agents on the elements mentioned above should also be considered.