bluuebunny/crossref_metadata_2025_split huggingface dataset:
Implementation and evaluation of an effective computational method that promotes the conceptualization of Newton’s laws of motion
Authors: González J D , Escobar J H , Sánchez H , De la Hoz J , Beltrán J R , Arciniegas S M , Martínez L S 
Published: June 2019

Abstract
A computational method that contributes to the understanding and conceptualization of Newton’s laws of motion, through the use of a novel environment of virtual experimentation of physical systems, was implemented in the students of the Faculty of Engineering and Basic Sciences of the Universidad del Magdalena. This article investigates the level of learning achieved by implementing the physical experiences in the mechanical laboratory and the virtual laboratories developed in the Unity platform, which can be used by the user to work in web environment and mobile devices, when downloaded as an application in Google Play and App Store. Conceptual tests were administered to assess students comprehension before, during and after instruction. The results revealed that the experimental and virtual conditions were equally effective in promoting student’s understanding of the concepts in the domain of Newton’s laws of motion; therefore, virtual manipulation, at least in a context such as that of the present study, reveals an important method in the learning of physics.
Python script used as a simulator for the teaching of the electric field in electromagnetism course
Authors: Cristiano K. L. , Estupiñán A. , Triana D. A. 
Published: June 2019

Abstract
We present in this article a Python script, based on a methodology to obtain the electric field produced by n electric charges. This tool was implemented in courses of electromagnetism and its laboratory in three institutions of higher education. The aim of this work was to incorporate information and communication technologies (ICTs) at the physics subjects, in accordance with the programs promoted by the Colombian Ministry of Education. We wanted to connect the students with sensory experiences of the physical phenomena that allow them to improve their experience of learning of subjects traditionally studied through the board. Finally, in this work, an interactive computational code was obtained, in which the electric field of the discrete and continuous charge distributions can be calculated, for the classical problems that are shown in an electrical physics course.
Analysis of the effect of the variation geometric characteristics the basic cells in a metamaterial
Authors: Castro-Ladino J R , Ávila-Bernal A 
Published: June 2019

Abstract
The analysis of the impact of the variation of the substrate and the geometric characteristics of the cells basic that make up a metamaterial, as well as their frequency response, bandwidth and insertion losses level of the bandgap generated, is presented. A metamaterial in microstrip transmission line technology was simulated and manufactured on two dielectric substrates with different relative permittivity index, introducing electromagnetic band gap structures (EBG) in the ground plane. Five geometrical shapes were selected for the cells of the EBG structure. The response of the metamaterial is analyzed on the characteristics of the band gap, varying the lattice constant, the size and the geometry of the cells (defects) and the substrate used. The results obtained show that this type of devices can be used to measure the properties of elements by detecting the change of the refractive index of the metamaterial, with frequency selectivity. The study of these parameters is critical for the applications of metamaterials in filters, sensors and actuators, among others.
Cross-validation of a classification method applied in a database of sEMG contractions collected in a body interaction videogame
Authors: Montoya Vega M F , Henao O A 
Published: June 2019

Abstract
paper presents the evaluation and cross-validation of four pattern recognition classifiers, with the objective of finding the best one for classify surface electromyography (sEMG) signals combined with information extracted from videogame’s variables. The classifiers, a linear classifier, a quadratic classifier, a k-nearest-neighbor classifier, and a support vector machine, were computed on a data matrix created with the recorder signal collected from 12 subjects in a body interaction videogame that used a sEMG as a control strategy for upper limbs virtual rehabilitation. Although the classifiers of sEMG signal had a widespread study, there is not evidence of how to deal with the information of sEMG signals combined with game variables. The classification task is related with discern each subject as “good player” or “bad player”, looking to following the performance of the videogame’s users through the game sessions. A cross-validation of 10 iterations was computed, PCA and Relieff were used as feature extraction and selection methods. The evaluation was developed using the percentage of accuracy, defined as the well-predicted points. The best accuracy in the classification task was found using an SVM with a misclassification parameter of 400 and an RBF kernel regularization parameter of 60. Base on this result, the SVMs showed to be the appropriate classifier to be used on sEMG signal combined with videogame variables and should be implemented to follow the user’s performance.
Small additions of actived Biochar from palm oil shells to Portland cement mortar
Authors: Flórez E. , Acelas N. , Ramirez A.P. , Giraldo S. , Rodríguez B. , Correa E. , Echeverría F. 
Published: June 2019

Abstract
Biochar is a solid material obtained from the thermochemical conversion of biomass in a limited oxygen environment. Portland cement-based products are the main construction materials. The manufacturing process of cement result in several harmful emissions, in particular CO2 emissions. In this work, biochar was produce from residues of palm oil shells stover at 700°C under a limited oxygen condition. Biochar small additions of 0.1, 0.33 and 0.5 % (w/w) were incorporated into Portland cement mortar samples. Mortar samples were made according to the Colombian earthquake-resistant standard. Early compression strength of samples were evaluated at 7, 14, 21 and 28 days. Mortar samples were subjected to an accelerated carbonation test using a carbonation chamber built for that purpose. Results shows that the early compression strength was altered since mortar with no biochar additions exhibit higher compression resistance that the ones exhibited by samples with small additions. Furthermore, this decreasing in the early compression strength is attributed to the presence of the surfactant used to incorporate the small amount of biochar into the cement matrix. Carbonation result shows that samples with small additions of biochar increases the measured carbonation depth.
Analysis of the intermediate layer work in the three-tier architecture “client-server” of automation engineering problems
Authors: Barabanova I A , Kravets O Ja , Tkalich S A , Mutin D I 
Published: June 2019

Abstract
The article describes a mathematical model of a three-tier client-server architecture. The importance of using an intermediate server (application server), which provides preliminary data processing, is shown. Analytical conditions are obtained under which a three-tier architecture is more efficient than a two-tier one. Methods are proposed for increasing the performance of client-server systems in the tasks of automating production processes.
Creation of the virtual exercise machine of the technological production with the use of OMEGALAND dynamic modelling environment
Authors: Gaynullin Rustem , Zatsarinnaya Yulia , Staroverova Nataliya 
Published: June 2019

Abstract
The paper considers creation of the virtual model of receiving normal butane from isobutene-butene fraction with use of an integrated environment of OMEGALAND dynamic model operation to study the characteristics of the set technological mode. In the research process function chart was chosen and the parameters defining the key quality indicators of technological process of receiving normal butane were determined. The inventory which will participate in the simulation model is picked up. “Visual Modeler” dynamic model operation software with the graphic module and the module of the database are chosen as a medium for technological process modelling. The virtual model of a column used in simulators for tutoring and training prompt actions of technicians is created. Calculations of the established condition of process are performed, the analysis of sources to check the model for compliance with a real object is carried out.
Wireless three-channel Holter monitoring system
Authors: Ivel V P , Gerasimova Y V , Moldakhmetov S S , Petrov P A , Gerasimov I A , Zainchkovskaya K V 
Published: June 2019

Abstract
The article describes the principles of construction of a wireless automated system of Holter monitoring of cardiac activity which is focused on the minimum power consumption for use at home. This article proposes the method of wireless transmission of electrocardiosignals based on the use of a dual-processor transmitting Wi-Fi device. It also presents the algorithms of wireless transmission of electrocardiosignals providing high reliability of the transmitted information and develops the structure of the Holter monitoring system in three deflections using the multiplexing method in the formation of such deflections. The proposed methods and algorithms shall provide high-quality and multi-day wireless transmission of electrocardiosignals with low energy consumption.
Doubly-fed inductor motor as the element of automatic control system
Authors: Bronov S , Nikulin N , Avlasko P , Volkov D , Stepanova E , Krivova D , Bisov A , Pichkovskiy A , Zaznobina N , Lomova N 
Published: June 2019

Abstract
The presented linearized model of the dual-fed motor allows to synthesize the controller. The are many possible control system structures as well as the synthesis methods. This enables to provide a variety of the electric drive characteristics to meet the specific requirements.
Optimizing modeling of complex-structured objects in the problem of improving the efficiency of their functioning
Authors: Lvovich Y , Tishukov B , Preobrazhenskiy A , Choporov O 
Published: June 2019

Abstract
The paper discusses the characteristics of objects with complex structure. The properties of the objects of the considered type are determined. The analysis of features of their management is carried out, the results of which are used to find the problems arising at their functioning. The methods of improving their efficiency are investigated basing of the results of optimization modeling. The paper gives the procedure for forming an optimization model of a complex structured object for the task, as well as a generalized scheme for finding its solution. On the basis of the proposed generalized scheme and properties of the studied type of objects, the development of adaptive algorithms for numerical optimization is carried out to increase the efficiency of the considered class of objects.
Import substitution in the industrial sector: analysis and facts
Authors: Novikov S V , Lastochkina V V , Solodova A D 
Published: June 2019

Abstract
Sanctions policy against Russia is one of the most pressing political and economic issues since 2014. This format of international relations, of course, created a number of problems, but also allowed to make a breakthrough in the domestic industrial sector. Import substitution has become the main vector of movement of almost all sectors of the Russian economy. Currently, there are more than 1,100 import substitution projects in Russia in critical industries, 342 of which have reached the stage of serial production, and more than 760 are still “at the final stage” of implementation.
Computer-aided approach to synthesis of the frequency dictionary on system analysis in electronic machinery, aviation and space industry
Authors: Kovalev I V , Piskorskaya S Yu , Karaseva M V , Voroshilova A A 
Published: June 2019

Abstract
The practical use of the multilingual adaptive - training technology contributes to the intensive accumulation of specialized foreign terminology by students who study one or more foreign languages for their professional purposes. Electronic frequency dictionaries, built on a multilingual principle, are the basic components for supporting the multilingual adaptive – training technology. The article considers the computer-aided approach to the analysis of Frequency Dictionary on System Analysis in the Electronic Machinery, Aviation and Space Industry.
Supplemental Folate and the Relationship Between Traffic-Related Air Pollution and Livebirth Among Women Undergoing Assisted Reproduction
Authors: Gaskins Audrey J , Mínguez-Alarcón Lidia , Fong Kelvin C , Abu Awad Yara , Di Qian , Chavarro Jorge E , Ford Jennifer B , Coull Brent A , Schwartz Joel , Kloog Itai , Attaman Jill , Hauser Russ , Laden Francine 
Published: June 2019

AbstractTraffic-related air pollution has been linked to higher risks of infertility and miscarriage. We evaluated whether folate intake modified the relationship between air pollution and livebirth among women using assisted reproductive technology (ART). Our study included 304 women (513 cycles) presenting to a fertility center in Boston, Massachusetts (2005–2015). Diet and supplements were assessed by food frequency questionnaire. Spatiotemporal models estimated residence-based daily nitrogen dioxide (NO2), ozone, fine particulate, and black carbon concentrations in the 3 months before ART. We used generalized linear mixed models with interaction terms to evaluate whether the associations between air pollutants and livebirth were modified by folate intake, adjusting for age, body mass index, race, smoking, education, infertility diagnosis, and ART cycle year. Supplemental folate intake significantly modified the association of NO2 exposure and livebirth (P = 0.01). Among women with supplemental folate intakes of &lt;800 μg/day, the odds of livebirth were 24% (95% confidence interval: 2, 42) lower for every 20-parts-per-billion increase in NO2 exposure. There was no association among women with intakes of ≥800 μg/day. There was no effect modification of folate on the associations between other air pollutants and livebirth. High supplemental folate intake might protect against the adverse reproductive consequences of traffic-related air pollution.
Comparative floral structure and evolution in Galipeinae (Galipeeae: Rutaceae) and its implications at different systematic levels
Authors: El Ottra Juliana Hanna Leite , Demarco Diego , Pirani José Rubens 
Published: June 2019

AbstractGalipeinae (Rutoideae) is the most species-rich subtribe of Rutaceae in the Neotropics. The taxonomy of Galipeinae is complex as molecular phylogenies demonstrate that rearrangements of genera are necessary to reach the monophyly of the subtribe. A few detailed studies have found variability in floral features, such as different patterns of organ fusion and symmetry, with potential systematic importance. However, this was shown for a limited number of taxa. This study aimed to provide a broader comparative account of the floral structure of Galipeinae and closely related taxa of Rutoideae. Some floral features, such as the cochlear aestivation of petals and a free zone of carpels, support the monophyly of Galipeinae without Adiscanthus. Other features, such as apocarpy, anacrostyly, antitropous ovules and zig-zag micropyles, also provide support for the affinity of Rutaceae in Sapindales. Furthermore, complex patterns of organ synorganization of Galipeinae are more diverse than previously shown, and are probably correlated to other features that are not found elsewhere in Sapindales. Finally, we identified homoplastic features that are also widespread in asterids, probably related to similar floral functions, such as variable patterns of monosymmetric tubular corollas, two fertile adaxial stamens with basal appendages of variable length and herkogamy.
Robot-assisted minimally invasive esophagectomy (RAMIE) compared to conventional minimally invasive esophagectomy (MIE) for esophageal cancer: a propensity-matched analysis
Authors: Tagkalos E , Goense L , Hoppe-Lotichius M , Ruurda J P , Babic B , Hadzijusufovic E , Kneist W , van der Sluis P C , Lang H , van Hillegersberg R , Grimminger P P 
Published: June 2019

SUMMARY
Robot-assisted minimally invasive esophagectomy (RAMIE) is increasingly being applied as treatment for esophageal cancer. In this study, the results of 50 RAMIE procedures were compared with 50 conventional minimally invasive esophagectomy (MIE) operations, which had been the standard treatment for esophageal cancer prior to the robotic era. Between April 2016 and March 2018, data of 100 consecutive patients with esophageal carcinoma undergoing modified Ivor Lewis esophagectomy were prospectively collected. All operations were performed by the same surgeon using an identical intrathoracic anastomotic reconstruction technique with the same perioperative management and pain control regimen. Intra-operative and postoperative complications were graded according to definitions stated by the Esophagectomy Complications Consensus Group. Data analysis was carried out with and without propensity score matching. Baseline characteristics did not show significant differences between the RAMIE and MIE group. Propensity score matching of the initial group of 100 patients resulted in two equal groups of 40 patients for each surgical approach. In the RAMIE group, the median total lymph node yield was 27 (range 13–84) compared to 23 in the MIE group (range 11–48), P = 0.053. Median intensive care unit (ICU) stay was 1 day (range 1–43) in the RAMIE group compared to 2 days (range 1–17) in the MIE group (P = 0.029). The incidence of postoperative complications was not significantly different between the two groups (P = 0.581). In this propensity-matched study comparing RAMIE to MIE, ICU stay was significantly shorter in the RAMIE group. There was a trend in improved lymphadenectomy in RAMIE.
Challenging Monarchical Legacies in Edward III and Henry V
Authors: Lidster Amy 
Published: June 2019

Abstract
Tudor chronicles regularly presented Edward III and Henry V as exemplary English monarchs, celebrated for their famous military victories against the French. During the last two decades of the Elizabethan period, these monarchs featured in a variety of new texts: as part of a flurry of war manuals that explore the conduct and experience of war and in plays for the professional stages. Together, the war manuals and stage plays make up an important body of texts that reveal the intertwined popular appeal of Edward III and Henry V and their application to contemporary politics, including the state of ongoing military preparation and engagement that marked the end of the Elizabethan period. This article offers a contrastive analysis of the monarchs' representations in selected war manuals and in Shakespeare's Henry V and the apocryphal Edward III. It argues that, while the war manuals examine the legacies of Edward and Henry, they are less detailed and critical than the plays, which offer potential for radical deconstruction of monarchical authority. Mediating between celebration and criticism, the plays question two aspects that had been closely associated with the popular reputations of these monarchs: a model of kingship that relies significantly on the person of the monarch and the legitimacy and expediency of foreign conquests. As the most sustained, individual accounts of Edward III and Henry V from the last decade of the Elizabethan period, the stage plays form an important part of the historiographical tradition and evaluation of these monarchs.
Socioeconomic inequalities in suicide mortality in European urban areas before and during the economic recession
Authors: Borrell Carme , Palència Laia , Marí Dell’Olmo Marc , Morrisson Joana , Deboosere Patrick , Gotsens Mercè , Dzurova Dagmar , Costa Claudia , Lustigova Michala , Burstrom Bo , Rodríguez-Sanz Maica , Bosakova Lucia , Zengarini Nicolas , Katsouyanni Klea , Santana Paula 
Published: June 2019

Abstract

Background
Few studies have assessed the impact of the financial crisis on inequalities in suicide mortality in European urban areas. The objective of the study was to analyse the trend in area socioeconomic inequalities in suicide mortality in nine European urban areas before and after the beginning of the financial crisis.

Methods
This ecological study of trends was based on three periods, two before the economic crisis (2000–2003, 2004–2008) and one during the crisis (2009–2014). The units of analysis were the small areas of nine European cities or metropolitan areas, with a median population ranging from 271 (Turin) to 193 630 (Berlin). For each small area and sex, we analysed smoothed standardized mortality ratios of suicide mortality and their relationship with a socioeconomic deprivation index using a hierarchical Bayesian model.

Results
Among men, the relative risk (RR) comparing suicide mortality of the 95th percentile value of socioeconomic deprivation (severe deprivation) to its 5th percentile value (low deprivation) were higher than 1 in Stockholm and Lisbon in the three periods. In Barcelona, the RR was 2.06 (95% credible interval: 1.24–3.21) in the first period, decreasing in the other periods. No significant changes were observed across the periods. Among women, a positive significant association was identified only in Stockholm (RR around 2 in the three periods). There were no significant changes across the periods except in London with a RR of 0.49 (95% CI: 0.35–0.68) in the third period.

Conclusions
Area socioeconomic inequalities in suicide mortality did not change significantly after the onset of the crisis in the areas studied.
Determining spatial patterns in recreational catch data: a comparison of generalized additive mixed models and boosted regression trees
Authors: Navarro Matthew , Hailu Atakelty , Langlois Tim , Ryan Karina L , Kragt Marit E 
Published: June 2019

Abstract
Marine recreational fisheries (MRFs) are often highly spatially heterogenous, with effort concentrated into small areas, and fisheries spanning large environmental gradients. However, spatially resolved catch data is rarely collected in MRFs, preventing the study of spatial heterogeneity in catch. This study uses recreational catch reported in 10 × 10 nm blocks across eight degrees of latitude in Western Australia to map spatial predictions of the probability of a recreational catch on an average trip for two key species: West Australian dhufish (Glaucosoma hebraicum) and snapper (Chrysophrys auratus). Two spatial modelling techniques are compared for the analysis, generalized additive mixed models (GAMMs) and boosted regression trees (BRTs). We find that BRTs outperform GAMMs, but performance gains are small. We also find marked spatial variations in recreational catch probabilities: high catches of dhufish are found in the north of the study area, and low catches in the Perth Metropolitan area and in the south; snapper catches are highest in the north and low in the south. These patterns are used to identify important spatial processes in the fishery. The analysis also suggests that modelling approach (GAMMs or BRTs) has only a minor effect on outcomes of spatial catch analysis in MRFs.