bluuebunny/crossref_metadata_2025 huggingface dataset:
Impacto psicológico del ciberbullying en estudiantes universitarios: un estudio exploratorio
Authors: Redondo Jesús , Luzardo-Briceño Marianela , García-Lizarazo Karol Lizeth , Inglés Cándido J.
Published: July 2017

Los objetivos de este trabajo fueron determinar la prevalencia del ciberbullying entre los participantes del estudio, así como conocer el impacto psicológico tanto en cibervíctimas como en ciberagresores, analizando además las diferencias de género de dicho impacto. Método: la muestra estuvo constituida por 639 estudiantes de la Universidad Pontificia Bolivariana, seccional Bucaramanga, con una media de edad de 17,6 años (chicos N = 303, chicas N = 334). Para ello se emplearon los siguientes instrumentos: (a) Escala de ciberagresiones; (b) Escala de cibervictimización; y (c) Symptom Assessment-45 Questionnaire (SA-45). Los resultados evidencian que un 27,5% de la muestra ha sido agredida en alguna ocasión, así como que 26,7% ha sido acosador durante el último año. Por otro lado, los resultados demostraron que existe un impacto psicológico (escalas del SA-45) tanto en las cibervíctimas, como en los ciberagresores. Conclusiones: Respecto a las diferencias de género en ciberbullying se evidenciaron solo en algunas escalas (primordialmente depresión, ansiedad, sensibilidad interpersonal y somatización), aunque no fueron significativas entre los síntomas psicológicos reportados en este estudio (salvo en las escalas relacionadas con Somatización y Ansiedad fóbica). © Revista Colombiana de Ciencias Sociales.
La desaparición de los 43 normalistas en México: una aproximación al análisis crítico del discurso en la prensa
Authors: Robledo-Silvestre Carolina , Velásquez-Upegui Eva Patricia
Published: July 2017

Se propone un análisis crítico del discurso de la prensa en el cubrimiento de la desaparición de cuarenta y tres jóvenes estudiantes en Guerrero (México) en septiembre de 2014. Para ello se explora un corpus de 2.107 documentos periodísticos, obtenido en tres meses de seguimiento a los diarios Reforma y La Jornada, con el objetivo de identificar las estrategias discursivas utilizadas en la prensa para reportar este suceso, a partir del análisis de la frecuencia léxica y la ocurrencia de frases nominales. En concreto se identifican cuatro estrategias discursivas: la negación y la neutralización, empleadas para ocultar la responsabilidad del Estado en los actos violentos; y la historización y la acreditación, como parte del discurso disidente. Todas estas estrategias están orientadas a la disputa de los campos léxicos que dan sentido a la desaparición forzada y a la violación de los derechos humanos. © Revista Colombiana de Ciencias Sociales.
Arte y memoria: expresiones de resistencia y transformaciones subjetivas frente a la violencia política
Authors: Villa-Gómez Juan David , Avendaño-Ramírez Manuela
Published: July 2017

Este artículo de revisión tiene como objetivo recoger y hacer una sistematización preliminar de investigaciones y textos de reflexión teórica o investigativa, sobre la relación entre arte y memorias colectivas, en contextos de conflicto armado, dictaduras y represión política. Método: se revisaron las bases de datos Scopus, Redalyc, Sage, Taylor & Francis, Scielo y Dialnet. Se recopilaron artículos en ciencias sociales y otros textos sobre memoria colectiva, con el fin de identificar las formas a través de las cuales el arte es un vehículo y vector para la conservación, transmisión y expresión de memorias subalternas. La información se analizó según el método de análisis categorial por matrices, siguiendo un procedimiento intratextual de coherencia, uno intertextual y una codificación teórica que permitió cruzar las categorías con el marco geográfico de las acciones. Resultados: se partió de investigaciones sobre las producciones artísticas en relación con los denominados “lugares de memoria”, concernientes a la iconografía, la mitología y la historia oficial del Estado-Nación, para avanzar hacia expresiones de memoria en las que el arte formal y los artistas profesionales se vinculan a la construcción mnemónica en sus propios países, aportando nuevos elementos para la recordación, la representación de la historia y la elaboración de horrores y traumas colectivos. Conclusión: la relación entre arte y memoria posibilita resistencias a las historias oficiales, en la reivindicación de los derechos de las víctimas, en la reconstrucción del tejido social o la lucha por la justicia. © Revista Colombiana de Ciencias Sociales.
“Mujeres peligrosas”: Prácticas discursivas del Estado chileno en relación con la prostitución, el comercio sexual y el trabajo sexual
Authors: Espinoza-Ibacache Jacqueline , Íñiguez-Rueda Lupicinio
Published: July 2017

El artículo indaga las prácticas discursivas del Estado chileno en relación con las mujeres que ejercen la prostitución, comercio sexual o trabajo sexual. Hicimos un análisis basado en los estudios del discurso desde una perspectiva pragmática y realizativa del lenguaje, a partir de 18 normativas y leyes identificamos actos del habla, implicaturas e interdiscursos. En los resultados planteamos tres categorías conforme que denominamos: definiciones, prescripciones y transformaciones. Las definiciones son usadas para la descripción de la actividad y los sujetos de intervención. Las prescripciones materializan el discurso mediante obligaciones e instrucciones dictadas para el control social. Y las transformaciones, relacionadas con los dos primeros, crean una nueva situación respecto a la actividad, mediante la actualización de mecanismos y la definición de nuevos sujetos. Concluimos que las normativas producen prácticas discursivas para el control social de los cuerpos de las prostitutas, de las mujeres que ejercen comercio sexual y las trabajadoras sexuales, situándolas en la línea de la anormalidad, de esta forma definen una guía de comportamiento para el resto de las mujeres. © Revista Colombiana de Ciencias Sociales.
Imputing missing groundwater observations
Authors: Dax Achiya , Zilberbrand Michael
Published: July 2017

In this paper, we consider the problem of completing missing records of annual water levels. The water levels records are taken once a year, in a group of neighboring wells. The collected records are assembled into a data matrix, where each column refers to a different well and each row refers to a different year. Yet some entries of the matrix are unknown and we want to assign appropriate values to these entries. The need for solving such problems arises in many applications, as many models and programs require a complete set of data. Traditional approaches for handling missing groundwater records are based on statistical techniques for treating missing data. The current paper introduces a new approach for solving this problem. One that is able to take advantage of the ‘matrix structure’ of annual water levels. This type of ‘matrix imputing methods’ has been proved successful in many modern areas, but it has not yet been tested in hydrology. Special attention is given to the question of assessing the quality of the imputed water levels. The proposed methods are examined on a number of test cases.
Post Cardiovascular Surgery Atrial Fibrillation. Biomarkers Determining Prognosis
Authors: Manfrini Olivia , Cenko Edina , Ricci Beatrice , Bugiardini Raffaele
Published: July 2017

Background: New onset of atrial fibrillation (AF) after cardiovascular surgery is associated with increased risk of complications and length of hospital stay. Identification of patients at high risk of post-operative AF (POAF) may help to act with preventive strategies having clinical and economic relevance.  Objective: The focus of this review is to summarize findings on biomarkers of myocardial fibrosis (PICP and PIIINP), profibrotic mediators (TGF-beta1), extracellular matrix remodeling (MMP-9), myocardial stretch (BNP and NTpro-BNP), inflammation (interleukins, C-reactive protein and sCD40L), and myocardial necrosis (high-sensitivity troponin T), biomarkers, that can be used in clinical practice to stratify patients at risk for POAF.  Method: We searched English-language studies on MEDLINE and PubMed. Evidence synthesis was based on cohort studies, clinical trials and meta-analysis data. International clinical practice guidelines were reviewed, as well.  Results: Factors such as cardiac remodelling, atrial pressure, surgery trauma, inflammation, oxidative stress, and sympathetic/parasympathetic activation have been implicated in the development of POAF. On the basis of multifactorial mechanism underlying the onset of POAF, several studies have investigated the predictive value of some serum biomarkers. To date, there are promising preliminary data on the clinical utility of PICP, PIINP, TGF-β1 and sCD40L, whereas data on NT-proBNP, BNP, CRP, IL- 6, and hs-cTnT are controversial.  Conclusion: Although some studies have shown promising results, there is a need for future larger studies with longer follow-up, before applying biomarkers as tools for POAF risk-stratification into clinical practice.
Support for the Forensic DNA Database and Public Safety Concerns: An Exploratory Study
Authors: Pivetti Monica , Caggiano Antonella , Cieri Filippo , Battista Silvia Di , Berti Chiara
Published: July 2017

Background:

Over the past few decades, 32 European countries have introduced a national DNA database containing samples and/or profiles from suspected/convicted criminal offenders and biological materials from crime scenes. However, only a few studies have empirically investigated opinions on such a practice and the psychosocial factors possibly predicting public support or opposition.

Objective:

This study aims to preliminarily explore public support for a national DNA database in Italy. In particular, the role played by psychosocial factors, such as concern over individual rights vs. public safety, as well as genetic and juridical/legal literacy in the public’s acceptance of a forensic DNA database, was investigated.

Method:

Within a correlational study, a written questionnaire was administered to a sample (N = 242) of university students.

Results:

Participants generally showed support for a forensic DNA database. Concerns over public safety predicted the acceptance of a DNA database, with those valuing public safety being more supportive of its implementation, whereas no role was played by familiarity with the fundamental mechanisms of genetics and with the Italian Criminal Code and Criminal Procedure Code.

Conclusion:

Empirical research on this issue could provide policymakers and the police force with a better picture of the psychosocial factors underlying public support for the DNA database.
DAYA HAMBAT DEKOK KULIT APEL MANALAGI (Malus sylvestrs Mill.) TERHADAP PERTUMBUHAN Staphylococcus aureus dan Pseudomonas sp. PENYEBAB MASTITIS PADA SAPI PERAH
Authors: Surjowardojo Puguh , Susilawati Tri Eko , Sirait Gabriel Ruth
Published: July 2017

Tujuan dari penelitian ini adalah untuk mengetahui daya hambat dekok kulit apel Manalagi terhadap pertumbuhan bakteri Staphylococcus aureus dan Pseudomonassp. Metode penelitian adalah Percobaan dan data dianalisis dengan menggunakan Analisis Varians (ANOVA) dari Rancangan Acak Lengkap (RAL) dan kemudian hasil perlakuan yang berbeda dianalisis oleh Duncan Beberapa Rentang Test (DMRT), dengan 4 perlakuan, dan 5 pengulangan. Perlakuan yang P0 (iodips), P1 (10% dekok kulit apel), P2 (20% dekok kulit apel) dan P3 (30% dekok kulit apel). Variabel yang diamati adalah zona hambat pertumbuhan bakteri Staphylococcus aureus dan Pseudomonas sp.Hasil penelitian menunjukan bahwa dekok kulit apel memberi hasil yang berbeda sangat nyata (p<0,01) dalam menghambat pertumbuhan bakteriStaphylococcus aureus danPseudomonas sp. Konsentrasi tertinggi dekok kulit apel Â P3 (30%) belum dapat mengimbangi kemampuan P0 (iodips) dalam menghambat bakteri Gram positif Staphylococcus aureus.Daya hambat dekok kulit apel dengan konsentrasi P3 (30%) dapat mengimbangi P0 (iodips) dalam menghambat pertumbuhan bakteri Gram negatifPseudomonas sp. Saran untuk penelitian selanjutnya meninggkatkan konsentrasi dekok kulit apel untuk larutan herbal teat dippingÂ Kata kunci : kulit apel, mastitis, antibakteri
La misericordia en la Biblia: un horizonte iluminador de la práctica cristiana.
Authors: Pérez-Cotapos Larraín Eduardo
Published: July 2017

This paper faithfully reproduces the main talk of Antofagasta V Theological Week. The author starts briefly analyzing the difficulties for man today to understand the term “mercy”. Then, he focuses on the analysis of this issue in the Bible, by studying the main terms used in it. He presents the Old Testament image of a faithful God, full of tenderness and compassion, who keeps his fidelity despite human sins. This is the God of Alliance. In the NT, mercy has a strong Christological nuance: Jesus is the best manifestation of the merciful face of God, who moves in front of misled crowds and those suffering. The Bible presents mercy mainly as God’s action, making possible a merciful response from human beings.
Revealing images as Facebook profile pictures: Influences of demographics and relationship status
Authors: Hetsroni Amir , Guldin Dror A.
Published: July 2017

In this study, we examined the impact of demographics and relationship status on posting a revealing picture of oneself as a profile picture on Facebook. We randomly sampled and coded 1,000 profiles of Israeli Facebook users ranging in age between 18 and 61 years. Over 40% of the profiles
showed at least 1 picture of the user dressed in a skimpy outfit. Results of a multiple logistic regression model indicated that younger age, a lower level of education, and not being engaged in a committed romantic relationship were significant predictors of the posting of these pictures.
Further, gender alone was not a significant predictor, but the interaction of gender and level of education was. Specifically, women with a high-schoollevel education posted revealing pictures of themselves more often than did men with a similar level of education. We analyzed our results
in light of Goffman's theory of self-presentation.
Peer relationships of left-behind children in China moderate their loneliness
Authors: Ling Hui , Fu En , Zhang Jian-Ren
Published: July 2017

We examined peer relationships and loneliness of children who have experienced separation from their parent(s) and compared them with children who have never had that experience. Chinese boys and girls (N = 232) aged 10 to 14 completed the Children's Loneliness Scale and the
Friendship Quality Questionnaire, and were asked to complete a peer nomination procedure designed to measure peer acceptance status. Results showed that 127 (54.7%) of the survey participants had experienced separation from their parent(s) because of parental migration for work (left-behind
children). The score for loneliness was higher in the group of left-behind children than in children without left-behind experience, but the scores of the two groups did not differ either on friendship quality or for peer acceptance status. Moreover, among the group of children who had experience
of being left behind, their loneliness scores were highly correlated with their scores for both friendship quality and peer acceptance status, but among the group who had no experience of being left behind there was a high correlation of their loneliness score only with their friendship quality
score.
South Korean students' responses to English-medium instruction courses
Authors: Chun Seungwoo , Kim Hyondong , Park Chan-Kyoo , McDonald Karin , Sun Ha Oh , Kim Dae Lyong , Lee Seon Min
Published: July 2017

We explored the underlying mechanism for South Korean university students' negative responses to English-medium instruction (EMI) courses. Specifically, English language anxiety and confidence, and EMI course attitudes and avoidance were analyzed using survey data from 187 Korean university
students. Results showed that English language anxiety played a key role in both EMI course attitudes and avoidance, and also affected student achievement in EMI courses. Students' English language confidence and their perceptions of their instructors' English language competence were found
to be unrelated to EMI course attitudes and avoidance, but were negatively related to English language anxiety. In addition, students' EMI course content understanding and grades did not directly influence EMI course avoidance, but did indirectly influence course avoidance through EMI course
attitudes. Our results highlight the importance of addressing students' emotional challenges and attitudes to improve their motivation to take EMI courses.
Revelations of a Pantheistic Poet: Dr K.V. Dominic in Conversation
Authors: Karmakar Goutam
Published: July 2017

Dr K.V. Dominic, English poet, critic, short story writer and editor, is a retired professor of the Post Graduate & Research Department of English, Newman College, Thodupuzha, Kerala, India. He was born in 1956 at Kalady, a holy place in Kerala where Adi Sankara, the philosopher who consolidated the doctrine of Advaita Vedanta, was born. He took his PhD on the topic ‘East-West Conflicts in the Novels of R. K. Narayan’ from Mahatma Gandhi University, Kottayam, Kerala. In addition to innumerable poems, short stories and critical articles published in national and international journals, he has authored/edited thirty books so far. Another poetry book of Dominic translated into French by Dominique Demiscault is in the process of being published in France. Prof. Dominic is the Secretary of Guild of Indian English Writers, Editors and Critics (GIEWEC). He has conducted several national seminars and workshops all over India. He is one of the writers of the SAARC (South Asian Association for Regional Cooperation) countries’ magazine and participant of SAARC literary festivals. He is the editor and publisher of the international refereed biannual journal, International Journal on Multicultural Literature (IJML) and Editor-in-Chief of the GIEWEC’s international refereed biannual journal, Writers Editors Critics (WEC). He is also the publisher of the international refereed annual, New Fiction Journal (NFJ). International Poets Academy, Chennai conferred on him its highest award in 2009; The India Inter-Continental Cultural Association, Chandigarh conferred on him the Kafla Inter-continental Award of Honour Sahitya Shiromani in recognition of his contribution in the field of literature at the 10th International Writers' Festival at Trivandrum (Kerala) in 2014.
Duchowość osób odbywających karę pozbawienia wolności
Authors: Skowroński Bartłomiej , Domżalska Aneta
Published: July 2017

Autorzy prezentują wyniki badań, których celem było ukazanie specyfiki życia duchowego osób odbywających karę pozbawienia wolności. Ich analiza potwierdziła, że osoby odbywające karę pozbawienia wolności charakteryzują się statystycznie istotnie uboższym życiem duchowym, aniżeli grupa kontrolna, którą stanowiły osoby niekarane. Osoby skazane w istotnie mniejszym stopniu poszerzają własną świadomość, rzadziej poszukują sensu otaczającej rzeczywistości, czerpią istotnie mniej przeżyć duchowych z czynienia dobra, są mniej wrażliwe na sztukę oraz na piękno zewnętrzne i wewnętrzne, co związane jest z wyborami moralnymi.
Shaping food systems towards improved nutrition: a case study on Tuscan Bread Protected Designation of Origin
Authors: Galli Francesca , Venturi Francesca , Bartolini Fabio , Gava Oriana , Zinnai Angela , Chiara Sanmartin , Andrich Gianpaolo , Brunori Gianluca
Published: July 2017

The concern for the quality of food, its composition and contribution towards nutrition and health is widespread among public and private food system actors. The increasing interest in locally integrated supply chains leads to reconsider the configuration of the food system in relation to sustainability and health outcomes. This article focuses on the relationship between processing practices and nutritional value in the wheat-tobread sector, illustrated by a case study on the Tuscan Bread Protected Designation of Origin (PDO). By adopting a food system perspective, the case study shows how the different actors have mobilized to respond to multiple drivers of change. A mixed research method approach is adopted to illustrate the relationship between processing practices and nutritional value outcomes: practice-based indicators for each step of the chain are complemented with performance-based indicators of the chemical, physical and sensorial profile of Tuscan Bread PDO. Furthermore, the implications on food system governance of a differentiation strategy based on territorial origin and enhanced nutrition are discussed.
Taxation and Corporate Risk-Taking
Authors: Langenmayr Dominika , Lester Rebecca
Published: July 2017

We study whether the corporate tax system provides incentives for risky firm investment. We analytically and empirically show two main findings: first, risk-taking is positively related to the length of tax loss periods because the loss rules shift some risk to the government; and second, the tax rate has a positive effect on risk-taking for firms that expect to use losses, and a weak negative effect for those that cannot. Thus, the sign of the tax effect on risky investment hinges on firm-specific expectations of future loss recovery.

JEL Classifications: H25; H32; G32.
Toomer's Energy Drinks: Fueling Earnings Management?
Authors: Long James H. , Mertins Lasse , Searcy DeWayne L. , Vansant Brian
Published: July 2017

Companies around the world commonly engage in earnings management. Some earnings management techniques comply with U.S. GAAP and do not violate financial reporting standards (e.g., real earnings management techniques such as postponing research and development expenditures), other techniques clearly cross the line (e.g., misclassifying repair and maintenance expenses as capital expenditures), and some fall into a gray area (e.g., adjusting the allowance for bad debt). This case exposes students to an ethical dilemma that involves earnings management: toward the end of its fiscal year, the executive management team at Toomer's Energy Drinks' European division realize that they will fall just short of a short-term financial performance target, and consider ways in which they can manage earnings to generate sufficient performance to meet the target. The case exposes students to ways in which companies manage earnings, and encourages students to think critically about the extent to which these techniques are ethical by requiring them to apply the IMA's Statement of Ethical Professional Practice and the AICPA's Code of Professional Conduct to a realistic scenario.
Discomfort associated with Invisalign and traditional brackets: A randomized, prospective trial
Authors: White David W. , Julien Katie C. , Jacob Helder , Campbell Phillip M. , Buschang Peter H.
Published: July 2017

Objective:

To evaluate differences in discomfort levels between patients treated with aligners and traditional fixed orthodontic appliances.

Materials and Methods:

This blinded, prospective, randomized equivalence two-arm parallel trial allocated 41 adult Class I nonextraction patients to either traditional fixed appliance (6 males and 12 females) or aligner (11 males and 12 females) treatment. Patients completed daily discomfort diaries following their initial treatment appointment, after 1 month and after 2 months. They recorded their levels of discomfort at rest, while chewing, and while biting, as well as their analgesic consumption and sleep disturbances.

Results:

Both treatment modalities demonstrated similar levels of initial discomfort. There were no significant sex differences. Patients in the traditional fixed appliances group reported significantly (P < .05) greater discomfort than patients in the aligner group during the first week of active treatment. There was significantly more discomfort while chewing than when at rest. Traditional patients also reported significantly more discomfort than aligner patients after the first and second monthly adjustment appointments. Discomfort after the subsequent adjustments was consistently lower than after the initial bonding or aligner delivery appointments. A higher percentage of patients in the fixed-appliance group reported taking analgesics during the first week for dental pain, but only the difference on day 2 was statistically significant.

Conclusions:

Patients treated with traditional fixed appliances reported greater discomfort and consumed more analgesics than patients treated with aligners. This trial was not registered.
Experiences of ENDESA Group in Generation of Electricity with biomass.
Authors: Rafael Guinea  , Xavier Noguer
Published: July 2017

ENDESA’s activities in renewable energy are  carried out by Endesa Cogeneración y Renovables, SAU  (ECYR), a 100% participated company. Besides its experience  with industrial cogeneration, wind farms, waste-to-energy  plants and minihydraulic plants, ECYR has a large experience  with electricity generation with different types of biomass. This  paper reviews ECYR participated plants and future projects,  using residual biomass from agriculture and forestry (“orujillo”,  “alperujo” and residual wood), energy crops and biogas, from  landfill and from sewage plants. A brief description of the  plants is given, as well as a more detailed description of the  newest and most outstanding plants (“orujillo” plants of  ENEMASA and La Loma, as well as landfill biogas plant in  Garraf).
Co-firing of Low Rank Coal and Biomass: A Chance for Biomass Penetration in the Renewables.
Authors: Antonio Valero
Published: July 2017

This paper presents a co-firing experience, with coal and biomass, whose objective was to prove the technical, environmental and economical feasibility (although the paper does not deal with this last one) of the implantation of this technology in a power plant of pulverised low rank coal. Precisely, this kind of coal particularities, specially its low energy density (kJ/m3), with similar values to most of the different dry biomass resources, is what makes a difference between this project and other co-firing experiences carried out previously.With regard to the main results, it must be pointed out that when introducing in the boiler a 5% of biomass: • No operation problem arose and no noticeable reduction in the boiler efficiency was caused. • Apart from the expected reductions in CO2 and SO2, an important decrease in NOx emissions was detected. • No emissions increase of CO, particles and volatile compounds were detected. Another aspect dealt in the project was the study of the possible impacts of forest biomass harvesting on the sustainability of the forest. Considering the low additional investments needed for establishing a Co-firing Biomass Power Plant, this technology is a real chance for introducing biomass in Spain. It only needs the same government incentives as other renewable technologies already receive.
Outlook of the Solar Photovoltaic Energy in Spain
Authors: Manuel Vázquez
Published: July 2017

In this paper, the state of development and outlook of the solar photovoltaic energy in Spain are analyzed in the framework of the Action Plan included in the 1997 European Commission White Paper of the Energy. The reviewed topics are the installed PV power, legislation and incentives, market situation and I+D+I activities. It is showed that the objectives for year 2010 are established as well as the legislative base. There are government financial aids but they have showed scarce to fulfil the objectives. In Spain there is an important PV industry at a world level as well as plenty of suppliers and installers.
Power Quality Problems and New Solutions
Authors: A.de Almeida  , L.Moreira, J.Delgado
Published: July 2017

In this paper, the main Power Quality (PQ) problems are presented with their associated causes and consequences. The economic impacts associated with PQ are characterized. Finally, some solutions to mitigate the PQ problems are presented
Robust Power System Stabiliser Design Based on m – Synthesis.
Authors: M. Bouhamida  , M. A. Denaï
Published: July 2017

One of the most important problems arising from large scale power systems is the low frequency oscillation. Excitation control or Automatic Voltage Regulator (AVR) is well known as an effective means to improve the overall stability of the power system. Power System Stabilisers (PSS) are introduced in order to provide additional damping to enhance the stability and the performance of the electric generating system. The output of the PSS as supplementary control signal is applied to the machine voltage regulator terminal. Conventional PSS have been widely used in power systems. Such PSS ensures optimal performance only at a nominal operating point and does not guarantee good performance over an entire range of the system operating conditions. Several techniques have been proposed for the design of more robust PSS structures. To guarantee the desired performance, this paper describes the control design models of a PSS based on µsynthesis, µ-analysis and H∞ control methods, which is returned when the system configuration changes. The control law is presented in both frequency domain and the time domain
The Ocurrence of Faults in LCI Drive Systems and its Effects on the Power Supply Quality.
Authors: Adérito N. Alcaso  , A. J. Marques Cardoso
Published: July 2017

This paper presents a study about the Load Commutated Inverter (LCI) drive, under faulty operating conditions. It is shown that an open-switch fault introduces great changes in the normal harmonic content of the supply currents.
Validity Range of Wind Turbine Models
Authors: M.P. Comech  , D. García García  , M. Sanz  , J. Martínez García  , M. García-Gracia
Published: July 2017

In this paper, the focus is on fundamental frequency simulations, also known as electromechanical transient simulations. In this type of simulation, the network is represented as an impedance matrix and only the fundamental frequency component of voltages and currents is taken into account in order to reduce the computation time. This simulation approach is mainly used for voltage and angle stability investigations. Models of wind turbine generating systems, which match the fundamental frequency simulation approach, are presented and their responses are compared with an electromagnetic transient model.
Energy Meter Behaviour Under Non-Sinusoidal Conditions.
Authors: A. Ortiz  , M. Lehtonen  , M. Mañana  , C. Renedo  , L. I. Eguíluz
Published: July 2017

Currently, there are two energy meters types installed: electromechanicals and electronics. The first ones are still the most frequent. However, new facilities tend to use electronics energy meters based on solid-state technology. Electromechanicals devices present characteristics already well known that allows us to measure only energy consumption. However, now the rules that manage the energy supply are totally new, there is a competitive electricity market. This way, detailed information on the energy consumption of each client is needed. In this point, electronic meters seem to be the best option to face the new challenges. This study will review the operating principles of solid-state energy meters. The behavior of some three phases models under nonsinusoidal conditions is studied. Experimental setup and test methodology are discussed as well.
Behaviour of the Wind-Turbines Under Lightning Strikes Including Nonlinear Grounding System.
Authors: D. Romero  , J. Montanyà  , A. Candela
Published: July 2017

Windfarms are every day increasing in number. So wind turbines are an easy aim for cloud-to-ground lightning for two main reasons: high isokeraunic level over windfarm locations and the height and sharp of the wind turbine structure and blades. Then the turbine should facility current flowing through its main parts: blades, rotor brushes and tower without dangerous overvoltages.
Grounding should be design to derive current efficiently, but in many situations grounding is conditioned to particular location aspects such as: extension and soil resistivity. Both aspects are strongly related with grounding performance.
This paper presents an analysis of a wind turbine overvoltages. It is modelled as a transmission line with different grounding models: a constant resistance, a nonlinear model based on soil ionisation, and a windfarm interconnected grounding model. Besides not only first lightning return strokes current are considered if not, subsequent return stroke current is included too
Optimization of the Dehydration of Muds in Purifier Station of Residual Waters by Means of the Employment of Photothermic Energy.
Authors: Alfonso Jesús Herrera Torres  , Antonio Espín Estrella
Published: July 2017

Due to desired engagement with environmental enhance improvement, in these papers a new proposal is described and justifies for giving solution to the residual water depuration proceeding mud’s quantity problem through a Clean Energy.
On sustained development, nowadays, we must take into account Alternative and Renewable Energies, by their eminent meaning. Besides, a growing problem also acquires importance like is the treatment of urban residues coming fro m water depuration.
Many parts take place in a Purifier Station, but this study is centred in the dehydration system, which takes charge of mostly decreasing of mud quantity.
Since the conviction of future increasing limitation of any kind of mud pouring places and the places where mud is used to refill lands, it is bet for the generation reduction and volume decreasing.
Technical and economical assessment of the effect of voltage sags on adjustable speed drives
Authors: J. M. Cano  , G. A. Orcajo  , C. H. Rojas  , M. G. Melero  , M. F. Cabanas
Published: July 2017

This paper describes a method for the evaluation of the economical losses caused by voltage sags in an industrial facility in which the presence of adjustable speed drives (ASD's) is significant. The nature of the data that must be provided in order to have practical information about system reliability at the point of common coupling (PCC) is analysed in detail. Then, the adequate methodology for considering the technical and economical consequences of voltage sags on the production is described for the case of critical drives. 
The analysis that is carried out in this work is also useful for making critical evaluations on the interest that the different solutions (ride-through alternatives)oriented to the improvement of performance of these apparatus can have in a particular case.
Experimental Study of Power Quality in Wind Farms.
Authors: F. Oliveira  , A. Madureira  , M. P. Donsión
Published: July 2017

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Power Reliability Measurement Through a Very Low Cost Strategy.
Authors: Joaquim Delgado  , Aníbal Traça de Almeida
Published: July 2017

Power Reliability (PR) and Power Quality (PQ) related issues are of great concern nowadays. In order to improve the quality of service supplied to the customer, organizations involved in the electrical sector have been adopting strategies and producing regulations. The main reason for these initiatives is to mitigate the impact of the electrical power disturbances over the customers’ processes. However, this new context requires a new category of measuring equipment that supports monitoring and recording relevant parameters relating to electrical power received from the utility so as to supervise and control compliance with existing regulations. The device with these capabilities is designated by Power Quality and Reliability Meter and Recorder (PQMeter).
In this paper a brief description of some PR and PQ issues is presented. We also explain the implementation of a PQMeter, characterized by a great simplicity, supported in the use of the capabilities integrated by the modern Uninterruptible Power Supplies (UPS). This will constitute a very low cost solution with some limitations in functionalities but sufficient for many situations and consequently with wide application. We will also present the performance of our solution applied to a case study where the electrical power supplied from the Portuguese utility to an educational institution, in a specific region of the country, was monitored and recorded throughout the year of 2004.
A ressignificação do espaço público de Porto Alegre a partir da apropriação efêmera da cidade
Authors: Edelweiss Roberta Krahe , Garzon Mauricio Ricardo Cabas
Published: July 2017

Compreendendo tanto a vitalidade da cidade a partir de seus processos de transformação, quanto a construção de uma identidade a partir de ações da sociedade civil constituintes de valores de memória, a abordagem deste artigo centra-se nos recentes eventos efêmeros de apropriação do espaço público realizados na capital do estado brasileiro do Rio Grande do Sul, Porto Alegre. Além de abordar a apropriação da cidade contemporânea — entendida como ‘ato de habitar’ e ‘construtora de lugar’ —, propõe uma reflexão sobre o significado desses eventos nos espaços públicos da capital gaúcha.

Palavras-chave: ressignificação; espaço público; apropriação; efêmero; Porto Alegre.
Españolismos y mexicanismos: hacia un diccionario internacional de la lengua española
Authors: Ávila Raúl
Published: July 2017

En este número no se incluyeron resúmenes ni palabras clave.
Fernando Martínez-Gil & Alfonso Morales-Front (eds.), Issues in the phonology and morphology of the major Iberian languages. Georgetown University Press, Washington, DC, 1997; 694 pp.
Authors: Herrera Zendejas Esther
Published: July 2017

Se reseñó el libro: Issues in the phonology and morphology of the major Iberian languages.
A IMPORTÂNCIA DO MARKETING DE EXPERIÊNCIA NO FLUXO LOGÍSTICO DE UM PARQUE TEMÁTICO. ESTUDO DE CASO: WALT DISNEY.
Authors: Franco Nayma Henrique , Moia Roberto Padilha , Silva Ana Lúcia Da Rocha , Pierangelo Rogério , Bueno Telma Regina
Published: July 2017

A adoção de estratégias de marketing de entretenimento vem sendo utilizadas cada vez com maior frequência. Porém, muitas empresas trabalham com produtos e serviços diferenciados e que precisam de um apelo mais emocional, possibilitando a vivência de experiências positivas por seus clientes. Esse artigo trata do conjunto de experiências que um consumidor adquire quando se relaciona com uma empresa no segmento de entretenimento. O Objetivo desse artigo é avaliar os fatores que levam uma empresa de entretenimento a fazer sucesso junto ao seu público-alvo utilizando-se de estratégias que permitam às pessoas viverem experiências que irão colaborar com a construção de uma imagem positiva da marca.
Caracterización de la agricultura y desarrollo rural de Eslovaquia
Authors: Sánchez Gómez Carlos , Turčeková Natália
Published: July 2017

El sector agrícola es fuente importante de recursos para la República Eslovaca. En el año 2014, la contribución de valor agregado, generado por el sector primario, a su producción nacional fue de 4.4%; en ese año un 46% de su población total vivía en zonas rurales. El objetivo fue hacer una caracterización de la agricultura y desarrollo rural de la República Eslovaca (1993-2014). Metodología. Para la caracterización se utilizaron los indicadores económicos señalados por el Banco Mundial en el apartado de agricultura y desarrollo rural. Resultados. En el periodo analizado, el valor añadido por trabajador eslovaco a la actividad agrícola, el uso de fertilizante y el rendimiento en la producción de cereales tuvieron tendencias crecientes a lo largo del tiempo; mientras que las tierras destinada a la agricultura, las superficie irrigadas, el uso de tractores, la producción agrícola, la producción animal y la producción de alimentos disminuyeron. La población rural se ha incrementado a lo largo del tiempo. En el año 2014, el 4% de la población total de Eslovaquia se empleó en actividades agrícolas. Limitaciones. Faltó incluir temas como la participación de jóvenes en las actividades agrícolas, migración, nivel educativo en zonas rurales y las acciones que se están realizando para la protección del medio ambiente. Conclusiones. La contribución del valor agregado generado por la agricultura de Eslovaquia continuará disminuyendo, sin embargo el valor añadido por trabajador Eslovaco a la actividad agrícola aumentará. La población rural seguirá teniendo una tendencia marginal creciente y la población dedicada a las actividades agrícolas continuará disminuyendo a lo largo del tiempo.
Swift Logic for Big Data and Knowledge Graphs
Authors: Bellomarini Luigi , Gottlob Georg , Pieris Andreas , Sallinger Emanuel
Published: July 2017

Many modern companies wish to maintain knowledge in the form of a corporate knowledge graph and to use and manage this knowledge via a knowledge graph management system (KGMS). We formulate various requirements for a fully fledged KGMS. In particular, such a system must be

capable of performing complex reasoning tasks but, at the same time, achieve efficient and scalable reasoning over Big Data with an acceptable computational complexity. Moreover, a KGMS needs interfaces to corporate databases, the web, and machine-learning and analytics packages.

We present KRR formalisms and a system achieving these goals.
The Impact of Treewidth on ASP Grounding and Solving
Authors: Bliem Bernhard , Moldovan Marius , Morak Michael , Woltran Stefan
Published: July 2017

In this paper, we aim to study how the performance of modern answer set programming (ASP) solvers is influenced by the treewidth of the input program and to investigate the consequences of this relationship. We first perform an experimental evaluation that shows that the solving performance is heavily influenced by the treewidth, given ground input programs that are otherwise uniform, both in size and construction. This observation leads to an important question for ASP, namely, how to design encodings such that the treewidth of the resulting ground program remains small. To this end, we define the class of connection-guarded programs, which guarantees that the treewidth of the program after grounding only depends on the treewidth (and the degree) of the input instance. In order to obtain this result, we formalize the grounding process using MSO transductions.
On Coalitional Manipulation for Multiwinner Elections: Shortlisting
Authors: Bredereck Robert , Kaczmarczyk Andrzej , Niedermeier Rolf
Published: July 2017

Shortlisting of candidates—selecting a group of “best” candidates—is a special case of multiwinner elections. We provide the first in-depth study of the computational complexity of strategic voting for shortlisting based on the most natural and simple voting rule in this scenario, l-Bloc (every voter approves l candidates). In particular, we investigate the influence of several tie-breaking mechanisms (e.g. pessimistic versus optimistic) and group evaluation functions (e.g. egalitarian versus utilitarian) and conclude that in an egalitarian setting strategic voting may indeed be computationally intractable regardless of the tie-breaking rule. We provide a fairly comprehensive picture of the computational complexity landscape of this neglected scenario.
Manipulating Opinion Diffusion in Social Networks
Authors: Bredereck Robert , Elkind Edith
Published: July 2017

We consider opinion diffusion in binary influence networks, where at each step one or more agents update their opinions so as to be in agreement with the majority of their neighbors. We consider several ways of manipulating the majority opinion in a stable outcome, such as bribing agents, adding/deleting links, and changing the order of updates, and investigate the computational complexity of the associated problems, identifying tractable and intractable cases.
Most Probable Explanations for Probabilistic Database Queries
Authors: Ceylan İsmail İlkan , Borgwardt Stefan , Lukasiewicz Thomas
Published: July 2017

Forming the foundations of large-scale knowledge bases, probabilistic databases have been widely studied in the literature. In particular, probabilistic query evaluation has been investigated intensively as a central inference mechanism. However, despite its power, query evaluation alone cannot extract all the relevant information encompassed in large-scale knowledge bases. To exploit this potential, we study two inference tasks; namely finding the most probable database and the most probable hypothesis for a given query. As natural counterparts of most probable explanations (MPE) and maximum a posteriori hypotheses (MAP) in probabilistic graphical models, they can be used in a variety of applications that involve prediction or diagnosis tasks. We investigate these problems relative to a variety of query languages, ranging from conjunctive queries to ontology-mediated queries, and provide a detailed complexity analysis.
Temporal Sequences of Qualitative Information: Reasoning about the Topology of Constant-Size Moving Regions
Authors: Cohen-Solal Quentin , Bouzid Maroua , Niveau Alexandre
Published: July 2017

Relying on the recently introduced multi-algebras, we present a general approach for reasoning about temporal sequences of qualitative information that is generally more efficient than existing techniques.

Applying our approach to the specific case of sequences of topological information about constant-size regions, we show that the resulting formalism has a complete procedure for deciding consistency, and we identify its three maximal tractable subclasses containing all basic relations.
Streaming Multi-Context Systems
Authors: Dao-Tran Minh , Eiter Thomas
Published: July 2017

Multi-Context Systems (MCS) are a powerful framework to interlink heterogeneous knowledge bases under equilibrium semantics. Recent extensions of MCS to dynamic data settings either abstract from computing time, or abandon a dynamic equilibrium semantics. We thus present streaming MCS, which have a run-based semantics that accounts for asynchronous, distributed execution and supports obtaining equilibria for contexts in cyclic exchange (avoiding infinite loops); moreover, they equip MCS with native stream reasoning features. Ad-hoc query answering is NP-complete while prediction is PSpace-complete in relevant settings (but undecidable in general); tractability results for suitable restrictions.
Verification of Broadcasting Multi-Agent Systems against an Epistemic Strategy Logic
Authors: Belardinelli Francesco , Lomuscio Alessio , Murano Aniello , Rubin Sasha
Published: July 2017

We study a class of synchronous, perfect-recall multi-agent systemswith imperfect information and broadcasting (i.e., fully observableactions). We define an epistemic extension of strategy logic withincomplete information and the assumption of uniform and coherentstrategies. In this setting, we prove that the model checking problem,and thus rational synthesis, is decidable with non-elementarycomplexity. We exemplify the applicability of the framework on arational secret-sharing scenario.
Foundations of Declarative Data Analysis Using Limit Datalog Programs
Authors: Kaminski Mark , Cuenca Grau Bernardo , Kostylev Egor V. , Motik Boris , Horrocks Ian
Published: July 2017

Motivated by applications in declarative data analysis, we study DatalogZ---an extension of positive Datalog with arithmetic functions over integers. This language is known to be undecidable, so we propose two fragments. In limit DatalogZ predicates are axiomatised to keep minimal/maximal numeric values, allowing us to show that fact entailment is coNExpTime-complete in combined, and coNP-complete in data complexity. Moreover, an additional stability requirement causes the complexity to drop to ExpTime and PTime, respectively. Finally, we show that stable DatalogZ can express many useful data analysis tasks, and so our results provide a sound foundation for the development of advanced information systems.