bluuebunny/crossref_metadata_2025 huggingface dataset:
Mechanical and Interfacial Characterization of Jute Fabrics Reinforced Unsaturated Polyester Resin Composites
Authors: Islam Farhana , Islam M. Naimul , Shahida Shahirin , Rashid Harun Ar , Karmaker Nanda , Koly Farjana A. , Mahmud Jumana , Keya Kamrun N. , Khan Ruhul A.
Published: April 2019

Jute fabrics reinforced Unsaturated Polyester Resin (UPR)-based composites were prepared by conventional hand lay-up technique. Different proportions (5 to 50% by weight) of fibre content was used in preparation of the composite. Tensile Strength (TS), Tensile Modulus (TM), Bending Modulus (BM), Bending Strength (BS), Impact Strength (IS) of the fabricated composites were studied. Upon each addition of fiber content in the matrix, mechanical properties of the composites were increased. The Tensile Strength (TS) of the 5% and 50% fiber reinforced composites was 18 MPa and 42 MPa respectively. Scanning Electron Microscopy (SEM) showed interfacial properties of the composites and it was revealed that the bond between fiber and matrix was excellent.
Free Vibration Analysis of Composite Material Plates "Case of a Typical Functionally Graded FG Plates Ceramic/Metal" with Porosities
Authors: Merdaci Slimane
Published: April 2019

This article presents the free vibration analysis of simply supported plate FG porous using a high order shear deformation theory. In is work the material properties of the porous plate FG vary across the thickness. The proposed theory contains four unknowns unlike the other theories which contain five unknowns. This theory has a parabolic shear deformation distribution across the thickness. So it is useless to use the shear correction factors. The Hamilton's principle will be used herein to determine the equations of motion. Since, the plate are simply supported the Navier procedure will be retained. To show the precision of this model, several comparisons have been made between the present results and those of existing theories in the literature for non-porous plates. Effects of the exponent graded and porosity factors are investigated.
Impact of a Novel Coating on Inorganic Scale Deposit Growth and Adhesion
Authors: Heydrich Marcus , Hammami Ahmed , Choudhary Suresh , Mockel Marcos , Ratulowski John
Published: April 2019

The deposition and growth of scale on the internal surface of oil & gas pipelines is a major challenge in the operation and maintenance of these lines. Pigging and chemical treatment are currently available solutions, but these are expensive, and a permanent passive alternative would be preferable. Diamond Like Coatings (DLC) have shown considerable promise, but the industry remains skeptical in the absence of conclusive evidence. This work addresses the question for a novel super hydrophobic DLC with a parametric evaluation of factors affecting adhesion and growth of common scale groups (such as Calcites and Barites) including surface finish of the substrate, metal composition, and thickness (or presence) of the coating, as well as the differing mechanisms of scale growth where applicable. The approach involves controlled deposition of inorganic scales onto rotational cylindrical electrodes (RCE) under varying conditions of temperature, solution chemistry, flow rates, followed by submerged jet impingement to quantify the corresponding deposit bond strengths and failure modes (cohesion vs. adhesion). Design of Experiments (DOE) methods are used to set and analyze the contribution of deposition and matrix factors simultaneously.
An Intelligent Data Driven Approach for Production Prediction
Authors: Noshi Christine Ikram , Eissa Marco Risk , Abdalla Ramez Maher
Published: April 2019

The objective of this work is to further explore the potential application of Machine Learning algorithms in production prediction and ultimate recovery. Intelligent Machine Learning Approaches such as Gradient Boosted Trees (GBT), Adaboost, and Support Vector Regressor (SVR) are applied to detect the most important features contributing to cumulative production prediction within the first 12 producing months. The models are applied on a data set composed of 5 wells in the Volve field in the North Sea. The collected data was then filtered and used to structure and train the different Regression algorithms and fine tune the appropriate hyperparameters. The different models were All models were evaluated by measuring the Mean Absolute Error (MAE). The generalization and precision performance of the proposed models are established by comparing the forecasted outcome after cross validation with field data. The optimized model can predict production response with high accuracy. The data-fitting process comprises of splitting the data into training using 70% of the data set, 15% validation, and 15% testing. Constructing a regression model on the training set and validating it with the test set. Recurrent application of a "cross-validation" process produces important information concerning the robustness of any regression-modeling method. Six parameters were considered as input factors to build the model. Factors affecting production prediction included on stream hours, average choke size, bore oil volume, bore gas volume, bore water volume, average wellhead pressure were used as input. The outcome showed that the developed model provided better prediction compared to analytical models with a 11.71% MAE prediction for SVR. This novel data mining application could be trained on any dataset to help predict future production performance at any conditions in any given scenario.
Review of Technical Challenges, Risks, Path Forward, and Economics of Offshore CO2 Transportation and Infrastructure
Authors: Sachde Darshan , McKaskle Ray , Lundeen Joe
Published: April 2019

Offshore storage capacity has been identified as an essential part of long-term Carbon Capture, Utilization, and Storage (CCUS) strategies. Transporting the CO2 from the source onshore to the offshore storage site will be a critical aspect of the technical and economic viability of offshore storage projects. Transport of CO2 will include all processes and equipment from the preparation of CO2 for transport at the source to the wellhead at the offshore storage site. This paper will review the technology required at each step, identify risks/key knowledge gaps specific to the offshore transport process, suggest steps to be taken to advance the technology, and provide an overview of cost/economics for each step in the process.

The authors use existing literature, an analysis of analog industries (e.g., offshore natural gas transport), knowledge from CO2 onshore transport, and a technical review of the processes and equipment required for offshore CO2 transportation. This analysis is based on a hypothetical CO2 source and transport process, but will highlight some project and site-specific challenges and decisions for each step.

Specific results from the review of offshore transport process include the following:

Impact of CO2 source on transport processes, including purification and preparation for transport (e.g., dehydration/compression processes);

Comparison of offshore pipeline specifications and costs to comparable onshore applications;

Review of scenarios where alternate transportation methods (e.g., ship transport) may be considered;

Technical review of wellhead and injection facility in the offshore CO2 application in comparison to onshore analogs;

Review of the impact of CO2 utilization (e.g., enhanced oil recovery) of CO2 on transport processes;

Tabulation of gaps in data or knowledge to guide further research or industry input.

The limited experience with offshore CO2 transport projects leaves significant gaps in available data and information on these projects. By aggregating the available information on offshore CO2 transport projects, supplementing with knowledge and data from related processes (offshore natural gas transport, onshore CO2 transport), and performing a technical review of the offshore transport processes and infrastructure, some specific data needs and risks for offshore CO2 transport projects are identified.
Lac Soisson Intrusive Suite: a potential extension of the Nain Plutonic Complex in the western Core Zone, Quebec
Authors: Corrigan D , Wodicka N , Lafrance I , Bandyayera D
Published: April 2019

The Lac Soisson intrusive suite consists of a swarm of small plutons and plugs of olivine-gabbro, gabbronorite and troctolite composition that were emplaced into Archean to Paleoproterozoic crust of the western Core Zone, west of the de Pas Batholith. These
intrusions are essentially non-metamorphosed, with unaltered olivine visible in hand specimen and thin section. They were mapped in detail by the Ministère de l'Énergie et des Ressources naturelles (MERN) in 2013 as part of the Lac Saffray mapping project in the Core Zone, and revisited
this past summer where a B.Sc. Honours thesis was initiated (Fleury, 2016), supported by the MERN. In 2000-2002, these intrusions had been targeted by the Western Mining Corporation (WMC) as part of their 'Quebec-7' Ni-Cu-PGE exploration program along the western margin of the SE Churchill Province.
Some of the values reported by WMC range up to 2% chalcopyrite, < 2% pentlandite and 108 ppb PGEs over meter-length sections in drillcore. During our targeted mapping in 2014 we sampled one of the main gabbroic phases of the intrusion for U-Pb dating. The sample yielded abundant,
large baddeleyite and zircon crystals, which were analyzed at the Geological Survey of Canada laboratory in Ottawa. Preliminary TIMS results stemming from the baddeleyite ages suggest that the magma was emplaced at 1312 ±1 Ma, slightly younger than the ca. 1333 ± 1 Ma Ni-bearing intrusions
of the Voisey's Bay complex in Nain. Zircon from the same Lac Soisson sample, however, yields a younger SHRIMP concordia age of 1295 ±11 Ma. Interestingly, some of the Voisey's Bay zircons yield ages that are compatible with baddeleyite ages (1333 Ma), whereas others yield ages that are
significantly younger, at ca. 1305 Ma. During the summer 2014, east-west oriented olivine gabbro dykes were also mapped and sampled as part of the regional mapping program. These E-W dykes are parallel to a set of crustal-scale faults and lineaments that appear to be associated to crustal extension
related to emplacement of the Nain Plutonic Suite. Some may in turn be feeders to the Lac Soisson intrusions. However, preliminary TIMS results suggest an age of ca. 1270 Ma for one of these dykes. The age correlation shown herein suggests that Ni-Cu mineralized, olivine-bearing mafic intrusions of
the Soisson Suite may very likely be related to the Voisey's Bay intrusions but were emplaced more than 300 km to the W-NW of the latter, in the western margin of the Core Zone.
Nurses’ perception of the multidisciplinary team approach of care for adolescent mothers and their children in Ugu, KwaZulu-Natal
Authors: Govender Desiree , Naidoo Saloshni , Taylor Myra
Published: April 2019

Background: Adolescent childbearing has numerous consequences on maternal health, child health and the well-being of society. Because of the high-risk nature of adolescent pregnancy, a multidisciplinary team (MDT) approach is recommended to achieve satisfactory pregnancy outcomes.Aim: The aim of this study was to explore nurses’ perceptions of the MDT approach in the continuum of care for adolescent mothers and their children.Setting: The study was conducted in a local district hospital in Ugu, KwaZulu-Natal.Methods: An explorative and descriptive qualitative study design was used. The first author and hospital staff (clinical midwives and the clinical manager of obstetrics and gynaecology) collaborated on the development of the focus group discussion (FGD) guide to explore nurses’ perception of the MDT approach of care for adolescent mothers and their children. A total of three FGDs were conducted. Data were analysed using thematic analysis.Results: Six overarching themes emerged from the data analysis which included professional benefits of adopting the MDT approach of care for adolescent mothers and their children, barriers to the multidisciplinary collaboration, clinical benefits of adopting the MDT approach of care for parenting adolescent mothers, problems and needs of adolescent mothers, and nurses’ reasons regarding their willingness to participate in a multidisciplinary collaboration in the care of parenting adolescent mothers.Conclusion: In the opinion of nurses, the MDT approach of care for adolescent mothers and their children is an important strategy to improve maternal and child health outcomes. This study has important implications for the design of an intervention.
Risk factors contributing to the incidence and mortality of acute childhood poisoning in emergency department patients in Iran: a hospital-based case-control study
Authors: Feiz Disfani Hamideh , Kamandi Mostafa , Mousavi Seyed Mohammad , Sadrzadeh Sayyed Majid , Farzaneh Roohie , Doolabi Najme , Rahmani Kazem
Published: April 2019

OBJECTIVES: Since poisoning is one of the most important preventable factors contributing to the hospitalization and death of children who present to emergency departments, this study was carried out to investigate the risk factors contributing to the incidence and mortality of acute childhood poisoning.METHODS: This hospital-based case-control study included 243 cases and 489 controls, drawn from daily admissions to the emergency departments of the included hospitals according to the inclusion and exclusion criteria.RESULTS: Gastrointestinal poisoning was the most common poisoning type, found in 87.7% of subjects, and medications were the most common cause of poisoning (49.8%). Multiple logistic regression analysis showed that a history of poisoning (odds ratio [OR], 10.44; 95% confidence interval [CI], 5.58 to 19.51; p<0.001) and the availability of poisonous substances (OR, 8.88; 95% CI, 5.41 to 14.56; p<0.001) were among the most important predictors of childhood poisoning. Respiratory poisoning (OR, 6.72; 95% CI, 1.40 to 32.07; p<0.05) and the presence of addiction in the family (OR, 4.54; 95% CI, 1.10 to 18.68; p<0.05) were the most important predictors of mortality among children with poisoning.CONCLUSIONS: Addiction and the presence of physical or psychological disorders in family members, a history of poisoning, and the availability of poisonous substances were significantly associated with the incidence of childhood poisoning and resultant mortality.
Transmission Routes of Extended-Spectrum Beta-Lactamase–Producing Enterobacteriaceae in a Neonatology Ward in Madagascar
Authors: Bonneault Mélanie , Andrianoelina Volasoa Herilalaina , Herindrainy Perlinot , Rabenandrasana Mamitina Alain Noah , Garin Benoit , Breurec Sebastien , Delarocque-Astagneau Elisabeth , Guillemot Didier , Andrianirina Zafitsara Zo , Collard Jean-Marc , Huynh Bich-Tram , Opatowski Lulla
Published: April 2019

The diffusion of extended-spectrum beta-lactamase (E-ESBL)–producing Enterobacteriaceae is a major concern worldwide, especially in low-income countries, where they may lead to therapeutic failures. In hospitals, where colonization is the highest, E-ESBL transmission is poorly understood, limiting the possibility of establishing effective control measures. We assessed E-ESBL–acquisition routes in a neonatalogy ward in Madagascar. Individuals from a neonatology ward were longitudinally followed-up (August 2014–March 2015). Newborns’ family members’ and health-care workers (HCWs) were stool-sampled and tested for E-ESBL colonization weekly. Several hypothetical acquisition routes of newborns—e.g. direct contact with family members and HCWs and indirect contact with other newborns through environmental contamination, colonization pressure, or transient hand carriage—were examined and compared using mathematical modeling and Bayesian inference. In our results, high E-ESBL acquisition rates were found, reaching > 70% for newborns, > 55% for family members, and > 75% for HCWs. Modeling analyses indicated transmission sources for newborn colonization to be species dependent. Health-care workers’ route were selected for Klebsiella pneumoniae and Escherichia coli, with respective estimated transmission strengths of 0.05 (0.008; 0.14) and 0.008 (0.001; 0.021) ind−1 day−1. Indirect transmissions associated with ward prevalence, e.g. through hand carriage or environment, were selected for Enterobacter cloacae, E. coli, and K. pneumoniae (range 0.27–0.41 ind−1 day−1). Importantly, family members were not identified as transmission source. To conclude, E-ESBL acquisition sources are strongly species dependent. Escherichia coli and E. cloacae involve more indirect contamination, whereas K. pneumoniae also spreads through contact with colonized HCWs. These findings should help improve control measures to reduce in-hospital transmission.
Beyond Blood Smears: Qualification of Plasmodium 18S rRNA as a Biomarker for Controlled Human Malaria Infections
Authors: Seilie Annette M. , Chang Ming , Hanron Amelia E. , Billman Zachary P. , Stone Brad C. , Zhou Kevin , Olsen Tayla M. , Daza Glenda , Ortega Jose , Cruz Kurtis R. , Smith Nahum , Healy Sara A. , Neal Jillian , Wallis Carolyn K. , Shelton Lisa , Mankowski Tracie (VonGoedert) , Wong-Madden Sharon , Mikolajczak Sebastian A. , Vaughan Ashley M. , Kappe Stefan H. I. , Fishbaugher Matt , Betz Will , Kennedy Mark , Hume Jen C. C. , Talley Angela K. , Hoffman Stephen L. , Chakravarty Sumana , Sim B. Kim Lee , Richie Thomas L. , Wald Anna , Plowe Christopher V. , Lyke Kirsten E. , Adams Matthew , Fahle Gary A. , Cowan Elliot P. , Duffy Patrick E. , Kublin James G. , Murphy Sean C.
Published: April 2019

18S rRNA is a biomarker that provides an alternative to thick blood smears in controlled human malaria infection (CHMI) trials. We reviewed data from CHMI trials at non-endemic sites that used blood smears and Plasmodium 18S rRNA/rDNA biomarker nucleic acid tests (NATs) for time to positivity. We validated a multiplex quantitative reverse transcription–polymerase chain reaction (qRT-PCR) for Plasmodium 18S rRNA, prospectively compared blood smears and qRT-PCR for three trials, and modeled treatment effects at different biomarker-defined parasite densities to assess the impact on infection detection, symptom reduction, and measured intervention efficacy. Literature review demonstrated accelerated NAT-based infection detection compared with blood smears (mean acceleration: 3.2–3.6 days). For prospectively tested trials, the validated Plasmodium 18S rRNA qRT-PCR positivity was earlier (7.6 days; 95% CI: 7.1–8.1 days) than blood smears (11.0 days; 95% CI: 10.3–11.8 days) and significantly preceded the onset of grade 2 malaria-related symptoms (12.2 days; 95% CI: 10.6–13.3 days). Discrepant analysis showed that the risk of a blood smear–positive, biomarker-negative result was negligible. Data modeling predicted that treatment triggered by specific biomarker-defined thresholds can differentiate complete, partial, and non-protective outcomes and eliminate many grade 2 and most grade 3 malaria-related symptoms post-CHMI. Plasmodium 18S rRNA is a sensitive and specific biomarker that can justifiably replace blood smears for infection detection in CHMI trials in non-endemic settings. This study led to biomarker qualification through the U.S. Food and Drug Administration for use in CHMI studies at non-endemic sites, which will facilitate biomarker use for the qualified context of use in drug and vaccine trials.
Formação docente e as representações de famílias organizadas em modelos não convencionais: os contos de fadas como proposta de intervenção
Authors: Oliveira Júnior Isaias Batista de , Raimundo Yaegashi Solange Franci
Published: April 2019

Este artigo teve como objetivo discutir as representações sociais sobre famílias organizadas em modelos não convencionais entre profissionais da educação e acadêmicos de Pedagogia. Como referencial teórico-metodológico utilizou-se a Teoria do Núcleo Central das Representações Sociais. Os dados da pesquisa foram coletados durante a realização do minicurso intitulado “Formação docente e as representações de famílias organizadas em modelos não convencionais nos contos de fadas”, desenvolvido no II Congresso das Licenciaturas da Universidade Estadual do Paraná. Participaram do estudo 25 sujeitos que responderam a um questionário sociodemográfico e a um instrumento de evocação livre antes e após a intervenção. Os resultados revelaram mudanças nas representações dos sujeitos da pesquisa entre o pré e o pós-teste. Essas mudanças devem-se, em parte, ao fato de os contos de fadas serem de fácil acesso e compreensão, o que favorece a adoção de uma nova postura, principalmente quando aliados a estratégias que visem problematizar as configurações familiares retratadas nas obras, possibilitando a adoção de uma nova postura, que pode vir a refletir no contexto escolar, favorecendo a integração nos ritos escolares e a promoção da cultura do respeito às famílias organizadas em modelos não convencionais.
Performance Characteristics of a Small Hammer Head Pump
Authors: Manohar Krishpersad , Adeyanju Anthony Ademola , Vialva Kureem
Published: April 2019

Abstract. Many rural farming areas are located far from reliable electricity supply, hence, having a reliable source of water for crops and livestock can prove to be an expensive venture. A water pump operating on the water hammer effect requires no external power source and can serve as an effective means of pumping water to a higher altitude once a reliable supply is available. The small hammer-head pump was designed to operate on the hammer head effect created by the sudden stoppage of a flowing fluid. This design consisted of an inlet section followed by the pump body, a pressure section and an outlet. The experimental set-up for testing the hammer head pump was designed with a variable head input and an adjustable head output. For each test configuration, ten samples of pump supply water and pump waste water were collected. The water samples were collected for 30 s in each case. The results showed delivered water flow rate varied according to a cubic variable with respect to pump outlet height. The pump was capable of delivering water to a maximum height of 8 to 10 times the height of the input head. The pump operated at average efficiencies of 26 %, 16 % and 6 % when the delivery height was twice, four times and six times the input head, respectively. There was a 5 % incremental decrease in pump efficiency as the delivery height increased in increments of the corresponding input head height.
The seasonal and interannual variabilities of the barrier layer thickness in the tropical Indian Ocean
Authors: Yuan Xu , Su Zhongbo
Published: April 2019

Abstract. The seasonal and interannual variations of the barrier layer thickness (BLT) in the tropical Indian Ocean (TIO) is investigated in this study using the Simple Ocean Data Assimilation (SODA) version 3 reanalysis dataset from 1980 to 2015. BLT presents a significant seasonal variation in the TIO, mainly attributed to the variations of the sea surface salinity (SSS) and the thermocline. In particular, BLT anomalies are negatively correlated to SSS anomalies in the western TIO, except in summer. In the eastern TIO, the thermocline anomalies positively impact BLT anomalies in all seasons. However, the dependency of BLT anomalies on thermocline in the western TIO is only observed during winter. Furthermore, It is found that BLT could feedback on SSS, as BLT of the spring-time can negatively affect the SSS of the summer-time in the western TIO. In terms of the interannual BLT variation, we found that both the Indian Ocean Dipole (IOD)and El Niño South Oscillation (ENSO) events could impact the variation of BLT by affecting the thermocline, especially in the eastern TIO. In addition, BLT in the western TIO presents remarkable seasonal phase locking feature during the El Niño years. During the developing and mature phases of El Niño, thicker BLT is due to the change of thermocline, while during the decaying phase of El Niño BLT opposing to the weakened thermocline change becomes more significant because of the change of SSS.
Issues in Teaching Speaking to EFL Learners
Authors: BOUZAR Siham
Published: April 2019

Speaking as a skill constitutes a real hurdle to overcome by both the teacher and the learner. In other words, the teacher has to find appropriate procedures to help the learner with while the latter has to find a way to master the language. Thus, this article attempts to highlight the concept of speaking; likewise, it tries to deal with the issues relevant to the appropriate teaching of speaking to learners of English as a foreign language (EFL) such as consciousness-raising strategies and oral error correction.
The Impact of Company Size, Asset Structure and Profitability on Capital Structure of the Automotive Sector Companies Listed in Indonesia Stock Exchange
Authors: Djazuli Abid , Choiriyah Choiriyah , Anggraini Novita Sari
Published: April 2019

This research’s purpose is to analyze the influence of firm size, asset structure and the profitability toward capital structure in automotive sector companies listed on the Indonesia stock exchange (BEI). The sample of this research used purposive sampling technique in line with criteria of automotive sector manufacturing company listed on BEI and publish the result of financial report and present the data completely including data from the variables in the research period (June 2012- July 2017), so it has 7 companies as the sample. To analyze the data, the researcher used multiple linear regression. The result of this research showed that there was no significant influence of firm size to capital structure. There was significant influence of asset structure to capital structure. There was no significant influence of profitability to capital structure. There was significant influence of firm size, asset structure and profitability toward capital structure.
Traumatic tension pneumothorax caused by Sylvester Palm frond
Authors: Zhoba Hryhoriy Bohdanovych , Vanderlan Wesley Blake
Published: April 2019

Traumatic tension pneumothoraces can result from blunt or penetrating trauma.  We present a case of a 48-year-old man that was diagnosed with traumatic tension pneumothorax following anterior penetrating left hemithorax trauma from a Sylvester Palm frond thorn.  Prior reports of traumatic tension pneumothoraces resulting from Sylvester Palm frond thorns were not found in the surveyed literature.
Trading the Dream: Does Social Media Affect Investors’ Activity - The Story of Twitter, Telegram and Reddit
Authors: Rothman Tiran
Published: April 2019

Bitcoin has received much attention in the media and by investors in recent years, although there remains scepticism and a lack of understanding of this cryptocurrency. I add to the literature on Bitcoin by studying How and if social media platforms such as Twitter, Telegram and Reddit are affecting Bitcoin’s prices and volume. Findings confirm that volumes of exchanged tweets may predict the fluctuations of Bitcoin’s prices and mainly Bitcoin volume. I also find that Reddit and Telegram have greater impact on Bitcoin volume rather than Twitter. Results indicate that information about the use of Twitter and other social media platforms can assist in tracking real world behavior and may even predict real financial markets trend.
Tridentate hydrazido-hydrazones vanadium complexes. Synthesis, properties and biological activity
Authors: Szklarzewicz Janusz , Jurowska Anna , Hodorowicz Maciej , Matoga Dariusz , Gryboś Ryszard , Filipek Barbara , Sapa Jacek , Głuch-Lutwin Monika , Mordyl Barbara , Kazek Grzegorz
Published: April 2019

Nine new vanadium complexes, with tridentate Schiff base ligand based on 3,5-di-tert-butyl-2-hydroxybenzaldehyde and different hydrazides, are described and characterized. The X-ray crystal structure of complex 8 shows distorted octahedral geometry of vanadium, with ONO ligand in equatorial position. The tridentate Schiff base ligand forms six membered and five-membered chelate rings at the V(V) acceptor center, with the corresponding bite angles being 82.97(9)˚ and 74.48(9)˚. The molecules are gathered by means of intermolecular O-H∙∙∙N hydrogen bond and layered by π∙∙∙π interactions involving the pyridine and phenolate rings. Such interactions expand the structure along the crystallographic a axis. The complexes were characterized by the elemental analyses, IR, UV-Vis, EPR spectroscopy, cyclic voltammetry, thermogravimetry and magnetic susceptibility measurements. The stabilization role of co-ligands is discussed. The cytotoxicity versus HepG2 hepatocytes and inhibition of human recombinant PTP1B was studied.
The influence of the parameters of heat
treatment on the mechanical properties
of welded joints
Authors: Łuczak K. , Wolany W.
Published: April 2019

Purpose: The main goal of the work is to determine the influence of the parameters of
stress relief annealing on the mechanical and structural properties of welded joints made of
chromium-molybdenum type 10CrMo9-10 steel.
Design/methodology/approach: In the study, commercial 10CRMO9-10 steel was used,
the Polish equivalent of 10H2M. This is a chromium-molybdenum toughened steel, i.e. after
normalization (910-960°C) and high tempering (650-780°C). The materials were subjected to
heat treatment, tests of mechanical properties, Charpy impact test, hardness of individual
material zones, as well as macro and microscopic observations.
Findings: The hardness tests indicated, that materials subjected to a single heat treatment
possess the greatest hardness. Materials undergoing several heat treatments, possess
hardness on a similar level to materials that have been annealed once, however they are
characterized by low reproducibility of results. The most important parameter of heat
treatment of the tested steel is heating up to a temperature of 690°C. Due to such heating,
optimal mechanical properties are achieved, which results in long and safe exploitation of
the produced elements.
Research limitations/implications: The processes of heat treatment are very important
to achieve optimal strength properties of welded joints.
Practical implications: The development of energy worldwide has caused the creation of
machines working in higher pressure and temperature ranges. The influence of temperatures
decreases the service life of a given element. The adaptation and completion of the
appropriate process of heat treatment extends the exploitation time of elements.
Originality/value: Determining the mechanical properties of 10H2M steel, dependent
on the temperature of heat treatment and heating time. It was concluded that the optimal
parameter of heat treatment for the tested materials – is heating at a temperature of 690°C.
Structural and functional simulation
of interaction in the field of aviation
safety by using matrices
Authors: Drobakha Hr. , Neklonskyi I. , Kateshchenok A. , Sobyna V. , Taraduda D. , Borysova L. , Lysachenko I.
Published: April 2019

Purpose: The conducted research was aimed at constructing a structural and functional
model for the interaction of bodies providing aviation safety during crisis management.
Design/methodology/approach: The methods of mathematical simulation and the
graph theory, the methods comparison and formalization have been applied to study the
process of interaction between the bodies assuring aviation safety. Using methods of the
linear algebra allowed constructing a mathematical model for the functional structure of
the interaction process that contains description of this process by the main methods of
interaction.
Findings: It has been proved that the interaction process has a certain functional properties
that reflect the functional relations between the modes of violator actions, the modes of
using the response forces and the modes of interaction. A structural and functional model
of interaction in semantic, algebraic forms and in the form of graphs has been created.
using typical operations with incidence matrices, the possibility of obtaining the physical
interpretation of the simulation results within the introduced algebra of functional structure
models has been justified.
Research limitations/implications: Discusses interactions between the bodies that
assure aviation safety and at the same time, the possibility of a crisis situation is taken into
account.
Practical implications: The developed models allow reflecting the current state of the
functional system and the elements of the process of interaction rather completely. It makes
a structural and functional analysis of interaction possible and allows defining the priority
directions of its organization, simulating the options and methods of interaction in solving
relevant tasks by the bodies that assure aviation safety.
Originality/value: That allowed not only describing the formal relations between the
methods of interaction and interacting units, between the interacting units and the modes of
violator actions, but also considering the influence of the interaction process on the current
state of the functional system.
O cinema como arte e dispositivo midiático potencializador de atos de currículo multirreferenciais no ensino superior
Authors: Amaral Mirian Maia do , Santos Rosemary Dos , Santos Edméa Oliveira
Published: April 2019

A cibercultura, cenário contemporâneo, mediado por tecnologias digitais em rede, vem impactando, significativamente, processos educativos e alterando dinâmicas sociocomunicacionais e culturais. No contexto da mídia-educação, como produtor de estranhamento de si e do mundo, o cinema estimula o surgimento de reflexões e formas de expressão diversas. Constitui, ainda, um potente dispositivo didático-pedagógico; sobretudo quando utilizado para além da perspectiva instrucional/informacional na composição dos currículos escolares voltados ao ensino superior. Alinhados à abordagem da pesquisa nos cotidianos escolares, na multirreferencialidade e nos princípios da pesquisa-formação na cibercultura, utilizamos o filme “Um Conto Chinês”, para criar atos de currículo na perspectiva de uma ecologia de saberes, uma pedagogia das emergências e uma artesania das práticas .  Desse modo, possibilitamos aos estudantes o desenvolvimento de novas visões de mundo, que contemplam, entre outras questões, a diversidade cultural e a alteridade, entrelaçando arte e educação, no contexto da pesquisa desenvolvida no Curso de Graduação em Educação da Universidade do Estado do Rio de Janeiro – UERJ, realizada no âmbito da disciplina Cotidianos e Currrículos, durante estágio de doutoramento.
Residência pedagógica em Educação Infantil: uma experiência em formação de professores.
Authors: Martins Edna , Carvalho Maria de Fátima , Cândido Renata Marcilio
Published: April 2019

O presente texto descreve uma experiência realizada em um Programa de Residência Pedagógica em Educação Infantil concebido e levado a efeito em uma universidade pública do Estado de São Paulo. Objetiva-se contextualizar detalhadamente como ocorre a imersão de residentes nas escolas-campo de Educação infantil, tomando como elementos de análise as inquietações, observações e reflexões registradas em cadernos de campo referentes aos anos de 2015, 2016 e 2017. Tal análise incide sobre as questões de maior abrangência relatadas pelos estudantes no processo cotidiano de estágio e versam sobre as temáticas: organização do espaço; rotina; gestão escolar; relação escola-família; o contato com a escrita a e diversidade na escola.  Conclui-se que tal experiência pode ser compreendida como forma de romper a dicotomia entre teoria/prática, apresentando-se como lugar de muitas vozes em diálogos correlatos à cultura escolar e à formação de professores com vistas a uma práxis educativa que possa ser calcada no respeito da escola pública de educação pela infância
Ciclagem de nutrientes em povoamento de Eucalyptus dunnii Maiden: produção de serapilheira e devolução de macronutrientes no bioma Pampa
Authors: Garlet Claudinei , Schumacher Mauro Valdir , Dick Grasiele , Viera Márcio
Published: April 2019

A serapilheira representa um componente de extrema importância na dinâmica nutricional dos ecossistemas florestais, atuando como um agente regulador dos processos de entradas e saídas dos elementos minerais e orgânicos na interface solo-planta. Diante disso, o presente trabalho objetivou caracterizar a produção da serapilheira e a devolução de macronutrientes em um povoamento de Eucalyptus dunnii com cinco anos de idade, na região da campanha sudoeste do bioma Pampa, município de Alegrete, Rio Grande do Sul, Brasil. Para isso, foram instaladas quatro parcelas de 20 m x 21 m, distribuindo-se, em cada uma delas, quatro coletores de área com 0,5 m2. Além disso, dentro de cada parcela foram demarcadas quatro áreas de 7,0 m2 para coleta de galhos grossos (diâmetro > 0,51 cm). As amostras de serapilheira foram coletadas quinzenalmente e separadas nas frações folhas, miscelânea, galhos finos (diâmetro < 0,5 cm) e galhos grossos, sendo posteriormente secas em estufa, pesadas, moídas e submetidas à análise química. A produção total de serapilheira foi de 9,6 Mg ha-1, onde a fração folhas é a maior constituinte (52,7% do total). As quantidades de Ca, N, K, Mg, S e P na serapilheira foram de 109,36; 59,62; 33,99; 21,17; 5,41 e 3,93 kg ha-1, respectivamente, dos quais 72,4% do total foi representado pelo somatório de Ca + N. Portanto, a serapilheira desse povoamento atua na manutenção da fertilidade do solo, o que é importante, já que não se trata de um ambiente natural.
Una dehesa por dentro: Castilrubio (1290-c. 1545). Paisaje, explotación y usurpación de términos = Inside a Pastureland: Castilrubio (1290-C.1545). Landscape, Management and Ilegal Appropriation
Authors: Clemente Ramos Julián
Published: April 2019

Castilrubio es una dehesa situada en el SW del término de Medellín. Hemos seguido su evolución a través fundamentalmente de unas ricas fuentes procesales que nos han permitido integrar toda la problemática relacionada con el mundo rural y las estructuras de poder. Hasta mediados del siglo XV se encuentra rodeada de una densa vegetación. El proceso de roturación, en un contexto de crecimiento agrario y conflictividad política, va a desencadenar un proceso de usurpación que refrenda posteriormente la justicia real. Se documenta una explotación a pasto y labor a mediados del XV, sustituida posteriormente en un contexto de subida de las hierbas por un aprovechamiento prioritariamente ganadero. En calidad de propietarios y luego de arrendatarios, labradores y élites rurales tienen un importante protagonismo.AbstractCastilrubio is a pastureland located south-west of Medellin (Extremadura). We have detailed its evolution essentially using rich judicial records that have allowed us to combine issues regarding rural society with power structures. Until the middle of the fifteenth century these lands were surrounded by dense vegetation. The process of clearing the land in a context of agricultural growth and political conflict will trigger a phenomenon whereby land will be illegally appropriated, but eventually legalized by royal authority. This land was used for agriculture and livestock by the mid fifteenth century, but later exclusively used for livestock grazing in the context of the rise in the price of pasture. Farmers and rural elites play an important role first as owners and then as tenants of this property.
Nueva perspectiva acerca de las enfermedades de Enrique IV de Castilla: el recetario del doctor Gómez García de Salamanca = A New Perspective on the Diseases of Enrique IV of Castile: The Medical Recipe Collection of Doctor Gómez García de Salamanca
Authors: Serrano Larráyoz Fernando , Carrillo Rodríguez Manuel Francisco
Published: April 2019

Este estudio busca completar, a través del manuscrito 2/Ms. 46 (ff. 123r-130v) de la Real Academia de la Historia (Madrid), el conocimiento de las enfermedades que pudieron aquejar al rey Enrique IV de Castilla. ¿Hasta qué punto los diagnósticos que se han hecho sobre el monarca tienen fiabilidad? ¿Las crónicas son objetivas cuando tratan de sus enfermedades? ¿Qué aporta el recetario –un documento profesional– al conocimiento de las enfermedades del rey? Estas son algunas de las preguntas sobre las que queremos dar respuesta.Recetario 2/Ms. 46 (ff. 123r-130v) de la Real Academia de la Historia (Madrid); Enrique IV de Castilla; Gómez García de Salamanca, enfermedades; crónicas; diagnósticos retrospectivos.AbstractThis study aims to contribute to research on the ailments suffered by king Enrique IV of Castile, through the study of the manuscript 2/MS.46 (ff. 123r-130v) of the Spanish Royal Academy of History (Madrid). To what extent are the diagnoses made so far reliable? To what extent is the information in chronicles objective when dealing with his diseases? What can this medical recipe collection, a professional document, contribute to our knowledge of the king’s diseases? These are some of the issues we explore in this article.
Reseña de: Jesús A. Solórzano Telechea y Arnaldo Sousa Melo (eds.), Trabajar en la ciudad medieval europea
Authors: González Zalacain Roberto J.
Published: April 2019

Datos completosJesús A. Solórzano Telechea y Arnaldo Sousa Melo (eds.), Trabajar en la ciudad medieval europea. Logroño, Instituto de Estudios Riojanos, 2018, 486 pp. ISBN: 978-84-9960-115-1.
Deslindes y amojonamientos medievales en las serranías de Gúdar-Maestrazgo: un acercamiento al patrimonio rural y a la didáctica del territorio = Medieval Boundaries and Demarcations in the Gúdar-Maestrazgo Mountains: A First Look at Rural Property and the Pedagogical Approach to Territory
Authors: Aparici Martí Joaquín , Villanueva Morte Concepción
Published: April 2019

En este artículo se aborda la compleja problemática histórica que encierra el estudio de los deslindes y amojonamientos municipales en la zona fronteriza de Gúdar-Maestrazgo durante el periodo bajomedieval. La principal aportación radica en la documentación conservada en el Archivo Notarial de Morella (Castelló) que adjuntamos como testimonio de aquellos pleitos pluriseculares e intensa conflictividad suscitada por las disputas entre los habitantes de uno u otro término en razón de dicho motivo.AbstractThis article deals with the complex historical problem that concerns the study of municipal boundaries and demarcations in the border area of Gúdar-Maestrazgo in the Crown of Aragon during the late medieval period. The main contribution is found in the records kept in the Notary Archives of Morella (Castelló) that we include as proof of the centuries-long lawsuits and the severe conflict between the inhabitants of one or the other territory that took place due to issues of territorial limits.
Estructuras militares y logísticas en la Corona de Castilla durante el siglo XIV
Authors: Romero Pérez Jonatan
Published: April 2019

Durante el siglo XIV comienzan a producirse en la corona de Castilla una serie de cambios y transformaciones profundas en sus estructuras organizativas que conducen a un incremento de los recursos fiscales, logísticos y militares disponibles. Este proceso, contemporáneo a otros territorios peninsulares y europeos, llevó a un aumento de las capacidades de reunión y sostenimiento de fuerzas militares en el tiempo y el espacio, a un cambio en la organización y conducción de la guerra, cuyas dimensiones espaciotemporales crecen, y en definitiva a un proceso evolutivo a largo plazo que conducirá a lo largo de la baja Edad Media a la aparición del ejército permanente como instrumento de poder del naciente estado moderno.AbstractA series of important changes and transformations in the organizational structure of the Crown of Castile took place during the fourteenth century and led to an increase in financial, logistical and military resources. This process which ocurred at the same time in other Iberian and European territories produced an increase in the capability to garner and maintain military forces through time and space. As well, it gave way to a change in the organization and the process of war, whose dimensions grew in every sense. In the end, the changes resulted in a long-term evolutionary process during the late Middle Ages that concluded in the rise of a permanent army as an instrument of power in the nascent modern state.
Reseña de: Lacarra, José María, Alfonso el Batallador. Estudio preliminar de Fermín Miranda
Authors: López Pita Paulina
Published: April 2019

Lacarra, José María, Alfonso el Batallador. Estudio preliminar de Fermín Miranda. Pamplona. Urgoiti editores, 2018, 260 págs. ISBN: 978-84-94629-648.
Reseña de: Martín López, María Encarnación y Cavero Domínguez, Gregoria, Colección Documental del Monasterio de San Guillermo de Villabuena (1172-1527).
Authors: López Villalba José Miguel
Published: April 2019

Martín López, María Encarnación y Cavero Domínguez, Gregoria, Colección Documental del Monasterio de San Guillermo de Villabuena (1172-1527). León, Universidad de León, 2017. 355 págs. ISBN: 978-84-9773-911-5.
Reseña de: Solórzano Telechea, J.A., Haemers, J., Czaja, R. (eds.), Exclusión y disciplina social en la ciudad medieval europea
Authors: Álvarez Fernández María
Published: April 2019

Solórzano Telechea, J.A., Haemers, J., Czaja, R. (eds.), Exclusión y disciplina social en la ciudad medieval europea, Logroño: Instituto de Estudios Riojanos, 2018, 386 págs. ISBN: 978-84-9960-121-2.
Supply Chain Service Quality Improvement by E-marketplace Automation
Authors: Poletan Jugović Tanja , Gumzej Roman , Čišić Dragan
Published: April 2019

E-marketplaces have become an essential part of e-commerce. In our research, a decentralized agent-based e-marketplace platform was devised. Although there are significant agent-based supply chain models in the literature, measuring quality performance using agents is still a subject of investigation. In order to improve overall supply chain service quality by allowing companies' agents to evaluate the service quality of their partners through the history of their transactions, this article proposes a service quality agent model. The model is designed using MCDM tools to suit different approaches to supply chain management. Consequently, since more informed procurement decisions are taking place continuously and autonomously at each node of a supply chain, supply chain service quality is being improved along the whole supply chain. At the end, the service quality valuation model of the supply chain is empirically evaluated.
MicroRNA-deficient mouse embryonic stem cells acquire a functional interferon response
Authors: Witteveldt Jeroen , Knol Lisanne I , Macias Sara
Published: April 2019

When mammalian cells detect a viral infection, they initiate a type I interferon (IFNs) response as part of their innate immune system. This antiviral mechanism is conserved in virtually all cell types, except for embryonic stem cells (ESCs) and oocytes which are intrinsically incapable of producing IFNs. Despite the importance of the IFN response to fight viral infections, the mechanisms regulating this pathway during pluripotency are still unknown. Here we show that, in the absence of miRNAs, ESCs acquire an active IFN response. Proteomic analysis identified MAVS, a central component of the IFN pathway, to be actively silenced by miRNAs and responsible for suppressing IFN expression in ESCs. Furthermore, we show that knocking out a single miRNA, miR-673, restores the antiviral response in ESCs through MAVS regulation. Our findings suggest that the interaction between miR-673 and MAVS acts as a switch to suppress the antiviral IFN during pluripotency and present genetic approaches to enhance their antiviral immunity.