bluuebunny/crossref_metadata_2025_split huggingface dataset:
Simulation with 3D Neuronavigation for Learning Cortical Bone Trajectory Screw Placement
Authors: Delgado-Fernández Juan , Frade-Porto Natalia , Blasco Guillermo , Gonzalez-Tarno Patricia , Gil-Simoes Ricardo , Pulido Paloma , Sola R.G. 
Published: December 2020

AbstractBackground and Objective Learning a new technique in neurosurgery is a big challenge especially for trainees. In recent years, simulations and simulators got into the focus as a teaching tool. Our objective is to propose a simulator for placement of cortical bone trajectory (CBT) screws to improve results and reduce complications.Methods We have created a platform consisting of a sawbone navigated with a 3D fluoroscope to familiarize our trainees and consultants with CBT technique and later implement it in our department. Objective Structured Assessment of Technical Skills (OSATS) and Physician Performance Diagnostic Inventory Scale (PPDI) were obtained before and after the use of the simulator by the five participants in the study. Patients who were operated on after the implementation of the technique were retrospectively reviewed.Results During the simulation, there were 4 cases of pedicle breach out of 24 screws inserted (16.6%). After having completed simulation, participants demonstrated an improvement in OSATS and PPDI (p = 0.039 and 0.042, respectively). Analyzing the answers to the different items of the tests, participants mainly improved in the knowledge (p = 0.038), the performance (p = 0.041), and understanding of the procedure (p = 0.034). In our retrospective series, eight patients with L4–L5 instability were operated on using CBT, improving their Oswestry Disability Index (ODI) score (preoperative ODI 58.5 [SD 16.7] vs. postoperative ODI 31 [SD 13.4]; p = 0.028). One intraoperative complication due to a dural tear was observed. In the follow-up, we found a case of pseudoarthrosis and a facet joint violation, but no other complications related to misplacement, pedicle fracture, or hardware failure.Conclusion The simulation we have created is useful for the implementation of CBT. In our study, consultants and trainees have valued very positively the learning obtained using the system. Moreover, simulation facilitated the learning of the technique and the understanding of surgical anatomy. We hope that simulation helps reducing complications in the future.
Critical sociocognitive analysis of hate speech in the 2015 Nigerian presidential election campaigns
Authors: Sunday Adesina B. 
Published: December 2020

Abstract
In an attempt to ensure electoral victory, politicians use different strategies. One of such is resort to hate speech to discredit the opponents. The 2015 presidential election campaigns in Nigeria witnessed unrestrained use of hate speech in different media. This paper analysed selected speeches of the campaign organisations of the two leading political parties in the election, namely the Peoples Democratic Party Presidential Campaign Organisation and the All Progressives Congress Presidential Campaign Organisation. Data were got from the speeches and advertorials of the two organisations sampled from The Nation and The Punch, published between January and March 2015. The speeches were subjected to critical sociocognitive analysis. The antecedents of the candidates became a recipe for hate speech. Propagandist and alarmist ideologies were used. Socially shared knowledge played an important role in the hate speech. Figures were used symbolically and serious attempts were made to frighten the electorate.
A private SUSY 4HDM with FCNC in the up-sector
Authors: Arroyo-Ureña M. A. , Díaz-Cruz J. Lorenzo , Larios-López Bryan O. , de León M. A. Pérez 
Published: December 2020

Abstract
We present a SUSY model with four Higgs doublets of the "private type," in which all fermion types (up, down, and charged leptons) obtain their masses from a different Higgs doublet

. The conditions for anomaly cancellation imply that the remaining Higgs doublet of the model (

) must have the same hypercharge as

, and thus, can only couple to up-type quarks, which opens the possibility to have FCNCs only in this sector. We study the Lagrangian of the model, and in particular, the Higgs potential, to identify the Higgs mass-eigenstates and their interactions; for the Yukawa matrices, we consider the four-texture case. We obtain constraints on the model parameters by using LHC measurements on the properties of the 125 GeV Higgs boson (h), and identify viable regions of the parameter space. Subsequently, these constraints are used to evaluate the prospects for detecting the FCNC decay mode

at the future high-luminosity (HL) option for the LHC, which are compared with current limits from LHC-run2. Moreover, we evaluate the FCNC decay of the next heavier Higgs boson

, which can typically reach

. The search for the signal at HL-LHC is also studied, and it is found that it may be detectable for specific regions of the model parameter space.
VII International Conference Days of Applied Mathematics
Authors: Almeida E Gelvez , Niño E D V 
Published: December 2020

These proceedings are the contributions made by the participants of the VII International Conference / Days of Applied Mathematics (ICDAM). The VII ICDAM has as its main purpose to share concrete experiences of mathematical knowledge in the resolution of situations, seen from different contexts.
The VII ICDAM was held in the city of San José de Cúcuta, Colombia, from November 4 to 6, 2020 through hybrid participation, and is organized by the “Facultad de Ciencias Básicas y Biomédicas” of the Universidad Simón Bolívar, San José de Cúcuta, Colombia. The VII ICDAM has the participation of students, professors, and researchers in the field of mathematics and physics from Colombia, Chile, Argentina, Mexico, Venezuela, and Peru. The contributions are framed in the Field of (i) Computational science, (ii) Medical physics, (iii) Mathematical physics, and (iv) Education and communication.
List of Organizing Committee, International Scientific Committee, National Scientific Committee, Sponsor, Partners and logos are available in this pdf.
Non-linear control over a continuous current to continuous current power converter using exact linearization
Authors: Mesa F , González J R , Correa G 
Published: December 2020

Abstract
Taking as a starting point the exact feedback linearization to transform a non-linear system into a linear one through coordinate transformation and state-space feedback based on its non-linear model, we have presented in this document the modelling, analysis and non-linear control of a boost-type power converter, with the objective of comparing the results with a proportional, integral and derivative controller. This technique was then applied on a power converter from continuous current to continuous current and the dynamics were analyzed zero to verify the validity of the controller, which was simulated in the Simulink-Matlab software. Finally, the simulation results showed that the system with the exact linearization controller is not only free of excess, but also improves the stability in the output voltage.
Proposal of an algorithmic methodology in Geo Gebra for the teaching of the Riemann sum a tool for approximating definite integrals
Authors: Bricio-Barrios E E , Arceo-Díaz S , Aréchiga Maravillas J 
Published: December 2020

Abstract
Integral calculus is a fundamental subject that enables the teaching of branches of physics like, mechanics, thermodynamics, and electromagnetism to engineering students. However, the incapacity of understanding either the concept of the area under a curve or to develop an efficient and simple way to calculate integrals continues to be a major cause of the high failure rate of students in these subjects. This work was developed parting from the proposal of using Information and communication technologies, in combination with flowcharts, for helping students to solve integrals trough Riemann sums. Even, a poll was used to recollect and do a qualitative evaluation on the degree of comprehension that students had on Riemann sums and their relation to integrals and to get feedback on their impression about the proposal of this work. The results are compared against traditional learning, based on memorizing the steps of the algorithm for each method and the representation of the convergence of successive roots by numerical tables.
Lesson study as a basis for mathematical practice at the university level
Authors: Flórez-Pabón C E , Acevedo-Rincón J P 
Published: December 2020

Abstract
The aim of this paper is to present the importance of the teaching practice of the future professor of mathematics in a Colombian public university, through the application of the Japanese methodology of lesson study. This methodology is proposed as a set of skills and daily practices that the future professor of physics or mathematics must develop for the preparation of the class as proposed in the paper. Among the main results that the research found is the importance of the practice of lesson study for the teaching of science in general, with emphasis on physics and mathematics, although this methodology can also be applied to the human sciences. On the other hand, the research recognizes that the use of this method should be assumed as part of the process of formation of the student of mathematics, physics or any discipline that requires preparation of the classes for the teaching process. It contributes to the professional profile of the future teacher in terms of quality and professionalism of the teaching work. Thus, it can be concluded that, the teaching of mathematics from this approach is a positive resource in the training of the teacher of mathematics, or any discipline such as physics that wants to implement it, because, it is being reflected in the didactic work that mathematics, or any science wants to exercise in the pedagogical and didactic process of the classroom through the teaching practice and, later on, in the professional work of each probationer.
Contribution of food loss to greenhouse gas assessment of high-value agricultural produce: California production, U.S. consumption
Authors: Qin Yuwei , Horvath Arpad 
Published: December 2020

AbstractFood loss (wasted and spoiled food) increases the burden on resources and environmental impacts throughout the entire food chain. This study describes and deploys a model and identifies data sources for estimation of greenhouse gas (GHG) emissions associated with food loss from farm production, delivery and refrigeration, retail sale, household consumption, and waste management in the United States using four California-grown high-value produce as case studies. The ratios of food wasted to food produced are 50%, 60%, 50%, and 64% for avocados, celery, lemons, and strawberries, respectively, and the differences are largely influenced by consumer-level and on-farm food loss. From the consumption perspective, this means, for example, that 1.8 units of strawberries are wasted for every unit consumed. The packaging material is a significant environmental offender, contributing, e.g. 52% to the total emissions (without food loss) for strawberries. End-of-life analysis of wasted food and packaging covers the common waste management practices: landfilling, composting, anaerobic digestion, incineration, and recycling. Uncertainties in the data are assessed through Monte Carlo simulation. With the consideration of food loss, the total GHG emissions from the entire life cycle of strawberries, celery, avocados, and lemons increase by 93%, 62%, 56%, and 53% to 0.26, 0.038, 0.061, and 0.058 kg CO2eq. per one serving size, respectively. Emissions from the annually wasted strawberries, avocados, celery, and lemons in California amount to 76, 24, 12, and 12 000 tons of CO2eq., respectively. Fourteen percent of the world’s population could have a serving of strawberries just from the annually wasted strawberries in California. However, wasteful consumer action can be even more significant. Emissions from a typical driving scenario to a store to purchase only one produce exceeds the emissions associated with all four produce combined. Reducing food waste during consumption and the environmental impacts of packaging should be prioritized.
Innovative approach to legal regulation for using beekeeping data in forest areas
Authors: Shatkovskaya T , Epifanova T , Romanenko N , Bulgakov V 
Published: December 2020

Abstract
The article descends in developing a legal framework for utilizing databases in forest beekeeping to resolve urgent beekeeping issues and improve the efficiency of its legal support. The goal was achieved basing on a systematic approach. To generalize the empirical data presented by statistical and economic indicators, authors applied methods of analysis, synthesis, and deduction as well. Combining both functional and modelling methods, authors developed legal patterns of databases. The authors confirmed that such problems of Russian beekeeping as poor development of industrial management, mass bees’ mortality caused by pesticides and agrochemicals, lack of qualified experts and expert laboratories to assist beekeepers in their economic activities cannot be solved without using the databases proposed in the study. The novelty and value of the research findings include highlighting the advantages of the development and implementation of databases of experts, beekeepers, expert organizations, pesticides, indicating active substances that are dangerous to bees and clinical signs of poisoning, using specific examples, which make possible qualitatively improving the economic activities, as well as increasing the efficiency of legal protection of the beekeeping producers’ interests in courts.
A study of dimensional and quality characteristics of sawlogs of the Vologda region
Authors: Tambi A , Ugryumov S , Birman A , Ishchenko T 
Published: December 2020

AbstractFollowing the results of 2019, in the Vologda region harvested 16.9 million m3of roundwood. Active forest utilization, combined with insufficient road construction, has led to the depletion of the forest resource base at an economically accessible distance from the timber enterprises. The purpose of the study is to assess the potential of wood resources and analyses the dimensional and quality characteristics of roundwood utilized as sawlogs at the sawmills of the Vologda region. As a result of the research, the following has been found out: the average diameter of harvested assortments, the parameters of curvature and taper depending on the apical diameter of pine roundwood. The following parameters have been evaluated: the diameter of the log, curvature, and taper of the roundwood. The studies were carried out by the photometric method. The established dimensional and quality characteristics of round timber allow us to conclude that sawmills in the Vologda region involve wood that has not reached the age of ripeness into industrial utilization, as a result of the depletion of the forest resource base near the infrastructure facilities. Termination of logging on leased areas occurs when the average diameter of the harvested raw material decreases to 13 cm.
State assessment of dominant tree layers of oak forests based on quantitative analysis of population strategies
Authors: Kirik A , Parakhnevich T , Popova V 
Published: December 2020

Abstract
The article considers the results of assessing the state of the tree layer of oak forests based on calculating the severity of population strategies of species in the community. The obtained values made it possible to establish how actively of the strategy is being implemented in various types of oak forests. The data analysis showed a high degree of correlation with succession processes characteristic of the considered communities, which expands the possibilities of quantitative assessment of forest sustainability. It has been established that the optimal condition of oak forests depends not so much on the presence of such a typical competitor as oak, but on the possibility of growing tree species with other strategies, which allows for a normal generational turn of in the plant community. Very important is the joint growth of trees belonging to all three types of population strategies: competitive - Quercus robur; ruderal - Betula pendula, Alnus incana, elm species; tolerant - Tilia cordata, Acer platanoides etc. The presence of external influences ensuring the creation of gaps in the tree layer for the development of oak undergrowth and heliophilous species also contributes to the long-term existence of the forest community. It was found that the existence of a relatively stable forest community can be expressed with the following values of degree of severity population strategies of the stand: competitiveness - 50-58, reactivity - 35-44, tolerance - 21-29.
Seasonal radial growth dynamics of Scots pine (Pinus silvestris L.) in Voronezh region (Russia)
Authors: Matveev S , Tishin D , Maximchuk P , Zhuravleva I 
Published: December 2020

Abstract
One of the insufficiently studied areas in dendroclimatology is the seasonal dynamics of the radial growth of trees in regions with different climatic conditions. The urgency of this problem has increased due to the observed climate changes. This paper presents the results of a three-year experimental study (2016-2018) on the seasonal growth dynamics of Scots pine in the Voronezh region, as well as the weather conditions during these growing seasons. It has been established that the Scots pine ecotype under the conditions of the forest-steppe zone demonstrates a multi-peaked cyclical dynamics of cell growth rate within the growing season. At the same time, the culmination of growth differs significantly in different calendar years. Annual averages for the following growth traits were registered for the Voronezh region: the duration of the formation of the annual ring (4 months), the onset (25.04-03.05) and the end (29.08) of annual-ring formation, the end of earlywood formation and the onset of the formation of the transition zone from earlywood to latewood (01.07) and the onset of latewood formation (01.08).
Investigation of the pneumatic system of recuperative hydraulic drive of a timber truck
Authors: Katrakilidis K , Posmetev V I , Nikonov V O , Posmetev V V 
Published: December 2020

Abstract
The direction of scientific research connected with increasing the efficiency of timber road transport by reducing energy losses in the hydraulic drive of the manipulator in the process of loading and unloading timber has been substantiated. The analysis of scientific works in the field of methods of recuperation of various types of energy in wheeled vehicles, recuperative devices and hydraulic drives, allowing to accumulate and usefully use the energy of compressed air. A perspective diagram of a recuperative hydraulic drive of a timber truck manipulator with a pneumatic system is proposed. The goal of the work is formulated, which is to develop mathematical and simulation models for the functioning of the proposed pneumatic system of a recuperative hydraulic drive for assessing the necessary indicators of its efficiency based on the revealed dependencies. Developed and investigated mathematical and on its basis simulation models of pneumatic system functioning. The dependences of the influence of time on the amount of compressed air, pressure and temperature in the pneumatic accumulator and pneumatic cavities of pneumatic cylinders are obtained.
Ways to solve the optimal mobility of forest complex machines in the formation of a logging enterprise
Authors: Matkerimov T , Yakovlev K 
Published: December 2020

Abstract
The paper discusses solving the problem of machine mobility using an hybrid evolutionary modeled algorithm. Until now, the problem of optimizing the mobility of machines has been considered as a private problem that does not take into account the completeness of all factors affecting the process. The goal of our research is to develop a method that allows it to be used effectively to find optimization problems. The proposed method includes three concepts: optimization of mode, structural parameters and control process. We relied on the basic provisions of mathematical statistics, methods of mathematical modeling, evolutionary modeling and parameter optimization. A system of functions has been compiled to perform the task of multi-criterion optimization of the mobility parameters of forest equipment based on four criteria: cross-country ability, speed, relative turning radius and probability of failure-free operation. A metagenetic approach has been applied, which made it possible to achieve the best combination of traditionally used optimization methods and a genetic algorithm. Tests of the received algorithm were performed on standard tasks. The test results showed that the proposed method makes it possible to obtain high-quality solutions at minimum cost. The PRADIS//FRONT information system was used in calculations and plotting.
Synergistic effect of the simultaneous exposure to ultraviolet radiation and nano-silicon preparation to increase the rate of seed germination
Authors: Kondrateva N , Kasatkina N , Nelyubina Zh , Maksimov I , Kirillov N , Ovchukova S , Rudenok V , Buzmakov D , Bolshin R , Zaitsev P 
Published: December 2020

Abstract
The article presents studies on the impact of ultraviolet light-emitting diodes and silicon-containing preparation “Nanosilicon” on the germination of seeds of meadow clover ‘Ranny 2’, alfalfa (Medicago varia) ‘Victoria’ and fodder galega ‘Yaltinsky’. The purpose of the studies was to investigate the synergism of the simultaneous exposure to ultraviolet radiation and nanosilicon to increase the rate of seed germination. The study was investigating ultraviolet radiation zone “A” (UV-A) for a period of 5 minutes. The average irradiance was 3.137 W/m2. A decrease to 2-3% of the amount of hard seeds of meadow clover was noted in the variants: first treatment was with ultraviolet light, and then with “Nanosilicon” (UV irradiation + “Nanosilicon”) and vice versa: first, treatment was with “Nanosilicon”, and then with ultraviolet (“Nanosilicon” + UV irradiation). In addition, a decrease to 7.9-9.5% of the seeds contamination was detected for fodder galega in almost all studied variants. The use of the preparation “Nanosilicon” and UV radiation on the seeds of alfalfa contributed to an increase in the length of the sprout up to 2.4 cm, the root up to 1.5 cm, the degree of development of seedlings up to 3.0 points, the growth rate up to 29.8%.
Design and Implementation of Ventilator for Breathing Apparatus
Authors: Hidayat  , Saiful J , Iman S , Suprapto  , Aidil I , Eddy S 
Published: December 2020

Abstract
This paper present the design and implementation of a ventilator for a breathing apparatus. The ventilators that developed are the positive pressure ventilation type, the cycled volume mode and the controlled mechanical ventilation method (CMV). The technology that used is the ambu bag. The design and manufacture includes an automatic ambu bag pressing mechanical system and a control system using the arduino microcontroller. The mechanical design that is compact, lightweight, energy saving, low cost, meets aesthetics and is friendly makes this tool attractive so it is not scary for patients. BPM (beep per minute), IER (inspiratory expiratory ratio) and TV (tidal volume) parameters can be controlled via a touch screen or remotely using a mobile phone via 4 buttons remotely to facilitate and avoid transmission of Covid-19 to medical personnel. BPM can be set from 5-20 BPM, IER from 1: 1 to 1: 4 and TV from 40-100%. The results of ventilator testing that have been done show a good response.