bluuebunny/crossref_metadata_2025_split huggingface dataset:
X International Congress of Physics Engineering
Authors: Granados Samaniego J , Tavera Romero F , López Gonsález G , Rios Maravilla A 
Published: March 2021

1. Introduction

The First International Congress of Physics Engineering was held at the Universidad Autónoma Metropolitana in Azcapotzalco in November 1999, to commemorate the 25th anniversary of Physical Engineering in Mexico and the 25th Anniversary of the creation of the Universidad Autónoma Metropolitana.
The fundamental purpose for which this congress was created was that on the Azcapotzalco campus an international scientific event were held in which the students and teachers of our institution could live with renowned foreign researchers and know the research work that is carried out in other countries and their results, as well as establish academic relationships and cooperation ties. This congress has been held every two years and in it have participated highly renowned scientifics as special guests, coming from various countries both in Europe and North America, South America and the Caribbean, as well as national institutions of the interior of the country and the Mexico City.
This congress has been strongly supported since its creation by prestigious academic institutions in Mexico, such as the National Polytechnic Institute, CINVESTAV, CICATA, the National Autonomous University of Mexico, the Research Center in Optics, the National Institute of Astrophysics Optics and Electronics.
Works submitted extensively to Congress undergoes a single blind peer arbitration process. Those who are accepted are presented orally and subsequently published in the Journal of Physics: Conference Series of the Institute of Physics of Great Britain, in Open Access for international dissemination.
List of Justification, Results, Remote communication, Organizing committee, Local Committee, International Scientific Committee, Editorial Committee, Aknowledgments and Sponsors are available in this pdf.
Thermomechanical and annealing processing effect on a rapid solidified Co – 20 wt. % Cr alloy
Authors: Luna-Manuel J C , Lagar-Quinto S , Ramirez-Ledesma A L , Juarez-Islas J A 
Published: March 2021

Abstract
The microstructure influence on the mechanical properties in a rapid solidified Co – 20 wt. % Cr alloy processed by hot – rolling (HR), and hot – rolling plus annealing (HR +A) is presented. The characterization consisted of a scanning electron microscopy inspection and its correlation with hardness, tensile test measurements and the corresponding fractography. The results showed that the as – cast (AC) condition is conformed by columnar dendrites aligned on a preferential direction. Additionally, numerous striations associated with the massive athermal transformation were observed. From the hot – rolled condition, athermal ε – martensite plates inside block austenitic grains were identified. On the other hand, the specimen subjected to hot – rolling plus annealing treatment showed an important internal stresses relief, reflected in the ductility improvement from 4.3 ± 2.18 % in the AC condition, and 13.73 ± 3.74 % in the HR condition to 27.8 ± 4.35 % for the HR + A condition.
On the strengthening mechanisms of a cross – rolled Zn – based bioabsorbable alloy
Authors: Domínguez-Contreras L A , Cruz-Herrera G A , Ramírez-Ledesma A L , Juárez-Islas J A 
Published: March 2021

Abstract
The Zn-Ag-Mg alloy system is a promising candidate material for a wide range of applications in the biomedical field. In this study, two rolling routes: unidirectional rolling (UR) and cross rolling (CR), were applied to induced different microstructural features on the presented Zn alloy. It was experimentally demonstrated that rolling in different ways, modifies the microstructural features from the as-cast condition and have a dramatic impact on the Zn-based alloy mechanical behavior. The better balance between yield strength (YS), ultimate strength (UTS) and elongation (%E) was obtained from the Zn-10.0Ag-1.0Mg alloy in CR with values ∼250MPa, ∼330MPa and ∼30, respectively.
Automatic bottling Machine
Authors: Aragón-Gonzáles G , Barragán-Santiago I , Huerta-Rizo E , León-Galicia A 
Published: March 2021

Abstract
A Mexican manufacturing plant, whose main product is bottled Pox (a traditional Mexican alcoholic beverage), requested the design and construction of an automatic bottling machine able to fill six bottles of 750 milliliters per minute and satisfy the exigencies of the Mexican regulation NOM-002-SCFI-2011. To develop this machine it was necessary, as a first step, to make an experimental study to determine the adequate dosage method to use, resulting in a dosage controlled with an electrical sensor that detects the free surface of the liquid inside the bottle. The automatic bottling machine is composed of four modules to fulfill the continuous supply of bottles and the liquid dosage. To command the complete control system and perform the automatic functions of the machine, an Arduino UNO board was adopted. The result of the work generated a versatile, efficient machine with a robust control system, able to dosage 250 to 4’000 ml volumes, not only for alcoholic beverages but for any liquid with viscosity and electrical conductivity similar to water, with an error not bigger than 15 ml.
Magnetoimpedance effect in amorphous Co-rich ferromagnetic microwires and its application as low-field sensor
Authors: López-Ortega C H , Montiel H 
Published: March 2021

Abstract
The magnetoimpedance in amorphous microwires with a nominal composition of Co67Fe4Si14B15 has been investigated. The measurements were carried out with an Agilent 4395A network analyzer in the frequency range from 100 kHz to 60 MHz. The experimental setup for magnetoimpedance measurements and the analysis of the results are presented. Our results show that an optimum frequency exists, where the magnetoimpedance ratio is maximum for all studied frequencies. In this frequency, the amorphous microwire is very sensitive to variations of the dc magnetic field. Therefore, we propose a possible application as a low dc field sensor.
Quantum classical correspondence for the statistical moments of eigenfunctions in closed systems with chaotic dynamics
Authors: Hernández-Saldaña H 
Published: March 2021

Abstract
Quantum classical correspondence, QCC, is a wide subject of interest from the historical approaches to current studies in simple and complex systems, including time dependent Hamiltonians. Quantum eigenfunctions, or wave-functions, are part of the quantities analysed in recent years, including the implementation due to M V Berry and A Voros in 1977 of a suitable quantity to be considered as the classical eigenfunction counterpart. Here we present the calculation of the statistical moments of eigenfunctions in energy representation for anharmonic oscillators. The classical counter part of the system is fully chaotic. The comparison of the quantum version in order to test for quantum classical correspondence is analysed using a slightly modified formula of the proposed by Berry and Voros. The agreement is good with the corresponding classical counterpart being at the bottom of the quantum version for all the energy range considered.
Evolution of Morphology, Structure and Emission in Si-rich HfO2:Nd films with Annealing Times
Authors: Rivero A , Torchynska T , Vega L , Casas J , Khomenkova L , Gourbilleau F 
Published: March 2021

Abstract
The impact of the time at high temperature annealing on the morphology, crystal structure and emission in visible spectral range has been studied in Si rich HfO2:Nd films produced by radio-frequency magnetron sputtering in pure argon plasma. The annealing was carried out at 900 °C for 1, 5, 10, 30 and 60 min in the nitrogen atmosphere. A set of experimental methods have been used, such as: scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and photoluminescence (PL). In the present work the joint analysis of PL and XRD results permits us to estimate the optimal time parameters of annealing at 900 °C the Si-HfO2: Nd films for obtaining the bright emission via 4f electronic levels of the Nd ions embedded in the tetragonal HfO2 phase mainly after long annealing (30- 60 min). The film oxidation for annealing times (60 min) stimulated some crystal phase transformation with the start of formation of the tetragonal SiO2 phase, that is accompanied by the defect generation and decreasing the PL intensity. The discussion of PL and XRD results is presented in detail.
An equivalent electric circuit as a tool for monitoring micron sized-particles in suspension from electrical impedance measurements
Authors: de León-Hernández A , Sánchez-Pérez C , Ramírez-Chavarría R G 
Published: March 2021

Abstract
In this work, a microfluidic device with a three-electrode system is used to measure the electrical impedance spectrum of micron-sized particles suspended in Phosphate Buffered Saline (PBS). We use polymer particles of 15 μm and 48 μm of diameter, as they can mimic biological cells in suspension. The main purpose is to study the influence of the particle concentration on impedance parameters and to establish the basis for biological cell suspensions assays. An electric equivalent circuit model is used to describe the experimental impedance data. Results show a high dependence of electrical parameters with the mass fraction and particle size. The model considers the resistance of the bulk solution and the electrical double layer, as the two essential electrical elements. Results show a maximum error of 3% by fitting the measurements to the proposed model. This proposal could be of interest for cytotoxicity assays.
Polycrystal x-ray diffraction modelling: grazing incidence versus Bragg-Brentano
Authors: Narvaez-Monroy J , Villalobos-Portillo E , Fuentes-Cobas L , Fuentes-Montero L 
Published: March 2021

Abstract
Diffraction-based texture analysis plays a significant role in the investigation of the physical properties of materials. The development of computer-aided tools for this research area facilitates quantitative validation of proposed orientation distribution models. We analyze the differences between Bragg-Brentano and grazing-incidence diffraction experiments from the point of view of texture characterization. New software packages for modelling Bragg-Brentano and grazing-incidence (one- and two-dimensional) XRD patterns produced by axially-textured polycrystals are presented. A case study based on a virtual experiment with a BaTiO3 sample is presented. The effect of texture on the diffraction patterns obtained by application of the different techniques considered differs significantly.
Ab initio study of optical properties of the [0001] Ti-surface with a carbon layer coverage and of graphene with an extensive Ti coverage
Authors: Zárate A , Salas O , Canales M , Magana L F 
Published: March 2021

Abstract
We used first-principles molecular dynamics at atmospheric pressure and 300 K to simulate a graphene layer, a titanium slab, the high coverage of the graphene layer with titanium, and the masking of the titanium surface with a carbon layer. The calculations were performed using the Quantum Espresso code with the GGA approximation. We then calculated the energy band structure and the optical absorption and reflectivity of the decorated surfaces. We found significant changes in these properties.
Industrial revolution 4.0 on big data adoption factors on social media users and popularity brands
Authors: Sardjono W , Rama Putra G , Selviyanti E , Cholidin A , Salim G 
Published: March 2021

Abstract
The purpose of writing this paper is to look at how factors of big data adoption affect the users of social media and brand popularity. The method used in the writing of this paper is by using path analysis and also by doing literature study to find reference material. The results of the analysis indicate that there is influence of big data adoption factors that affect the popularity of the brand. With this research, we get big data model that influence the brand popularity.
The development of worksheet oriented by visual learning style to measure geometry problem-solving skills
Authors: Shofyan A , Sunardi  , Yuliati N , Nuryami  , Rizkika P 
Published: March 2021

Abstract
Based on information from the math teacher at MTs. Nurul Islam Pasirian-Lumajang (East Java, Indonesia) which has 150 students of grade VII, there is a phenomenon was interesting. Many students like geometry lesson, this can be seen when the learning takes place with the media used interesting and many students like to draw flat shapes. However, when dealing with geometry problems, many students have difficulty determining the solution method. This study aims to develop teaching materials in the form of student worksheets on the circumference and area of a rectangle oriented towards students’ visual learning styles and visual perception skills. Next students will be given a test to analyze the ability to solve problems and in accordance with Polya’s problem solving steps that must be carried out sequentially, namely: understanding the problem, compiling a settlement plan, implementing the settlement plan, and checking the solutions that have been obtained. The development model used is the ADDIE model which includes: (1) Analysis, (2) Design, (3) Development or Production, (4) Implementation, and (5) Evaluation. Geometry material taken in this research is the perimeter and area of the rectangle. The results obtained from the analysis stage, that 50% of students have a visual learning style and for task analysis, the results obtained, of the 10 students who answered correctly there were only 2 students who answered correctly. After students read the material and worked on worksheets oriented to visual learning styles, there was a relatively significant change, out of 10 students there was only 1 student who did not understand in solving geometry problems.
Thinking process of 7th class students in understanding quadrilateral concepts based on Van Hiele theory
Authors: Kusuma M A , Susanto  , Yuliati N , Maharani P , Hasanah N 
Published: March 2021

Abstract
This study describes the thinking process of 7th class students in understanding quadrilateral concepts based on the van hiele theory. This research is a descriptive research with qualitative approach. The research instrument used was the researcher, the latest question sheets and interviews. Data collection methods used were tested and interviews. Data analysis techniques include data reduction, data presentation, and drawing conclusions. The results showed that S1 underwent an assimilation process when determining a rectangle is a parallelogram because S1 can correctly state the reason why a rectangle is a parallelogram. This shows that S1 has met level 2 (Informal Deduction) even though S1 has not been able to prove. S2 undergoes assimilation when answering questions. S2 begins to experience disequilibrium when S2 is asked about the number of vertices as evidenced by long silences. But after being given an understanding of the concept, S2 began to understand and there was an equilibrium. Then S2 experiences, accommodation when restating the nature of the rectangular shape. This shows that S2 has met level 2 (analysis). S3 undergoes an assimilation process because S3 chooses a shape which is a rectangular shape based on S3’s knowledge. This indicates that S3 meets level 0 (Visualization).
The effectiveness of research-based learning model of teaching integrated with computer simulation in astronomy course in improving student computational thinking skills
Authors: Ridlo Z R , Indrawati  , Afafa L , Bahri S , Kamila I S , Rusdianto  
Published: March 2021

Abstract
This research aims to explore students’ computational thinking skills within the implementation of the Research-Based Learning model of Teaching in Astronomy course in Kepler and Titius Bode Laws topics. The research design is comparing the modern class (experimental class) and traditional class with the traditional teaching type. RBL model of Teaching implemented in the experimental class, while direct Teaching implemented in the control class. Computer programming is also integrated into this research related to computational thinking skills. Matlab Software used in this research related to Astronomy course of Kepler’s and Titius Bode’s Laws topics. This research used triangulation methods. The quantitative methods were applied to analyze students’ achievement tests according to computational thinking skills. The Qualitative method was applied using the observation of students’ activity. Students’ achievement tests are represented by pretest and posttest scores. The posttest results for the experimental class were 80.4167 and the control class was 75.8108. The data analysis form pretest and posttest scores indicate a significant value of 0.012 (p ≤ 0.05) with the gain in mean that also emerged in both classes. The average value of student activity for the experimental class was 3.7444 and the control class was 2.4266 from a maximum value of 5. This research results that the RBL accompanied with computer simulations have a significant impact towards students’ computational thinking skills.
Development of science learning devices contexstual problem based learning (CPBL) based in improving problem solving skills for 4th grade elementary school
Authors: Agustoni A , Suratno  , Suparti  
Published: March 2021

Abstract
Problem solving skill are very much needed in the life of the 21st century. However, it is indicated that problem solving skills with the learning model so far have not significantly improved. This study aims to improve problem-solving skills for grade 4 elementary school by using natural science learning tools based on contextual problem based learning (CPBL) on theme 2 sub-theme 3 on alternative energy that is valid, practic and effectiv. Design research was quantitative descriptive and carried out by grade IV students of SD Muhammadiyah 6 Genteng, Banyuwangi Regency involving 70 students. Research of development using a 4-D development model research design consisting of 4 stages: define, design, develop and dissemination. Processing in this study used the SPSS 17 program. After conducting research on the experimental class and control class, the data obtained from student learning outcomes in the form of pre-test and post-test data. The data will be processed using SPSS 17 to determine whether there is an effect of developing CPBL-based science learning tools on problem solving skills in class IVSD. The influence test using the independent t-test first checked the assumptions of normality and homogeneity of the pre-test and post-test data. The normality test in this study used the Shapiro-Wilk test, while the homogeneity test used the Levene test, it was found that the Sig. in the Shapiro-Wilk column for the experimental class is 0.135, because 0.135> 0.05, the pre-test data for the experimental class is normally distributed. Furthermore, the Sig value is obtained. in the Shapiro-Wilk column for the control class is 0.214, which the pre-test for the control class is also normally distributed because 0.214> 0.05. The assumption for the normality of both data is fulfilled. The analysis was carried out using a mix method, namely combining statistical data with descriptive data in the form of lesson plans, worksheets, Learning Result Test, and problem solving abilities. The results showed that all indicators were categorized as good and very good. It can be concluded that the problem solving indicators of alternative energy source materials show significant results.
Status consciousness in energy consumption: a systematic review
Authors: Ramakrishnan Anjali , Creutzig Felix 
Published: March 2021

Abstract
Access to energy is a precondition for a decent standard of living. Some household decisions on energy consumption are however motivated to maintain or improve status, resulting in social zero-sum games, with environmentally harmful outcomes. Here, we review evidence relating status to energy consumption, elucidating consequential opportunities for climate change mitigation. To achieve this, we comprehensively collate and analyse existing published work that links status to household consumption decisions and behaviour across all end-use sectors, screening 2662 papers found with systematic search queries, identifying and fully reviewing 53 papers that comply with our criteria. We develop a systematic map of the literature and review quantitative and qualitative analysis relating energy end-use to status consumption. We identify 23 distinct (albeit some of them closely related) theories, with the literature most frequently referring to Veblen’s theory of conspicuous consumption. We also detail estimations of status-related energy consumption and identify ten studies that quantitatively relate status to energy saving behaviour or decisions, and four studies that relate status to increased emissions. Status can explain up to 20% change in consumption levels or the willingness-to-pay for carbon reducing consumption. Surprisingly, we find that major status-related consumption decisions, such as for housing and big cars, are hardly captured by the literature that relates status consumption to energy use and greenhouse gas emissions. This is a considerable gap in the literature, omitting major sources of status related decisions with high carbon footprint. We conclude that framing energy saving behaviour as high status is a promising strategy for emission reduction. Progressive taxation of status items, such as floor space and vehicle size, can effectively internalize the positional externalities and signal social undesirability, but also reduce emissions.
Association between household fuel types and undernutrition status of adults and children under 5 years in 14 low and middle income countries
Authors: Li Jing , Xu Xin , Li Jin , Li Dan , Liu Qiyong , Xue Haibin 
Published: March 2021

Abstract
Polluting biomass fuel use has adverse effects on human health, but there are limited studies exploring the association between biomass fuel use and undernutrition in adult and child population. The study aims to investigate the association between biomass fuel use and undernutrition status of adults and children under 5 years of age in low and middle income countries (LMICs). Data were from the Demographic and Health Surveys in 14 LMICs. The main exposure variable was type of fuel the household mainly used for cooking. Linear regression models and Modified Poisson regression models with robust error variance in consideration of complex survey design were used to estimate the association between type of fuel used for cooking and the outcomes of interest. Personal and household data were collected by questionnaire, and anthropometry data were collected by measurement with a standardised protocol. A total of 532 987 households were included in the analysis, and the majority of households (63.9%) used high polluting fuels. For women, use of high polluting fuels lead to a 0.66 kg m−2 (95% CI: −0.74, −0.58) decrease in BMI and a 10% (95% CI: 7%, 13%) higher risk of underweight. For men, high polluting fuels lead to a 0.63 kg m−2 (95% CI: −0.88, −0.38) decrease in BMI and a 11% (95% CI: 5%, 18%) higher risk of underweight. For children, high polluting fuels resulted in a 0.16 (95% CI: −0.20, −0.11), 0.17 (95% CI: −0.22, −0.11), and 0.09 (95% CI: −0.14, −0.04) unit decrease in weight-for-age, height-for-age, and weight-for-height z scores, respectively; high polluting fuel use can lead to a 10% (95% CI: 3%, 18%) higher risk of underweight and a 13% (95% CI: 7%, 19%) higher risk of stunting, respectively. Effective interventions should be adopted by policymakers to accelerate the transition of polluting fuels to cleaner energy in LMICs.