bluuebunny/crossref_metadata_2025_split huggingface dataset:
On the activation energy for plastic flow during tension test at room temperature and the anisotropy behaviour of Ti-6Al-4V alloy
Authors: Muñoz-Andrade J D , Aguilar-Sánchez M 
Published: March 2021

AbstractThe movement of dislocations inside of crystals during the tension test at constant crosshead velocity is related to activation energy for plastic flow in spatially extended polycrystalline systems. In this work, the main objectives are to establish the influence of the slip systems forαhexagonal compact packaging (hcp) titanium phase on the activation energy for plastic flow and the anisotropy influence on the plastic flow behaviour of Ti-6Al-4V alloy in sheet form under tension test at constant crosshead velocity of 1 mm/min in three in-plane orientations, namely in the rolling 0° (RD), 45° (DD) and transverse (TD) directions, respectively. By applying the quantum mechanics and relativistic model (QM-RM) proposed by Muñoz-Andrade, it is shown that for a <c+a> pyramidal type slip with a Burgers vector b=0.553 nm, the activation energy barrier for plastic flow at maximum stress in uniaxial tension in the sheet rolling direction, Q=115.115 kJ/mol is lower in comparison with Q=116,629 kJ/mol obtained by the <a> basal type slip with a Burgers vector b=0.295nm. These results are in accordance with the reduced cross-slip activation energy barrier for cross-slip onto pyramidal planes in an a hexagonal crystalline structure with compact packaging (hcp) titanium phase. Additionally, it was shown that transverse direction (TD) of Ti-6Al-4V alloy in sheet form has developed the maximum stress in uniaxial tension test and ductility.
Structural and TL glow curve of GdAlO3 perovskites
Authors: Alonso A , Rivera T , Barrera A , Zárate J 
Published: March 2021

Abstract
TL glow curve of any semiconductor is the patterns that mean when a material is suitable as Thermoluminescent (TL) material. Gadolinium aluminate (GdAlO3) perovskites have several properties that can be propose it as a good host for thermoluminiscent materials. GdAlO3 perovskite powder was synthesized by coprecipitation method and the powders were analyzed by characterization techniques. The Differential scanning calorimetry study showed changes in crystalline phases at 900 °C and 1084 °C during the calcination process. The first change of crystalline phase was identified by X rays diffractometry technique as a change from GdAlO3 hexagonal to GdAlO3 orthorhombic. TL glow curves of GdAlO3 under ultraviolet (UV) 256 nm and beta radiation effects were observed as crystallite size was increased.
Design of a test bench for a sternum prosthesis
Authors: Ramírez O , Torres-SanMiguel C R , Cuautle-Estrada A , Rivera-Hernández M A 
Published: March 2021

Abstract
The present work shows the three-dimensional design and the simulation of movements in a test bench to reproduce the respiratory cycle in human beings so that the useful life of a sternum prosthesis can be evaluated. A design methodology was used to identify the requirements and subsequently establish the design and selection of the elements. Among the most relevant parameters to consider in the design, the test bench is required to simulate the action of the forces on the prosthesis, which are generated during the respiratory cycle in humans, causing expansion of the rib cage and rib elevation. Additionally, the test bench is capable of applying a compression force to the thorax that produces a seat belt in an automobile to reproduce impact scenarios. The test bench has linear actuators to control the required action force and the applied displacements. Simulations results show that the test bench is capable of reproducing movements on the sternum during the respiratory cycle together with impact conditions, as well as the reliability that the test bench can be used to perform tests that require a high time.
On the onset of thermalization in closed few particles systems: Classical and quantum results
Authors: Hernández-Saldaña H 
Published: March 2021

Abstract
A study of quantum-classical correspondence for the onset of thermalization in an isolated system of four interacting particles is presented. Provided that classical dynamics of the system is chaotic, thermalization is present and fits the expected statistical mechanics results. Quantum classical correspondence is established for the classical analogue of the single particle distributions of occupation numbers. The latter quantity is useful to test thermalization and it allows to obtain the microcanonical Boltzmann factor in the quantum and semi-classical cases. The correspondence between them and the statistical mechanics results are surprisingly good considering that we have only four interacting particles. The resulting Boltzmann factor for the occupation number distribution depends on the eigenfunction width, which is a semi-classical parameter explicitly calculated and consistent with the quantum one.
Non-face-to-face physics laboratory, an educational strategy
Authors: Granados J , Tavera F , Cid A , Hernández R T , Velázquez J M 
Published: March 2021

Abstract
Under the health emergency implemented in Mexico City, due to pandemic caused by COVID19, and the measures to protect the population organized by the Secretaría de Salubridad and Federal Government, the face-to-face classes at all levels of education were suspended. This situation lasted for several months, so, in the case of the Universidad Autónoma Metropolitana, UAM, it was decided to continue conducting academic activities remotely. This decision brought an additional problem since some subjects taught in engineering careers cannot be implemented for the student to carry them forward at home. This is the case with physics labs. Situation that led to this educational research. The issue to solve is How can you teach Physics Lab in a non-in-person way? In this paper we describe how the objective was achieved, specifically in the Learning Teaching Unit, UEA, Laboratory of Rigid Body and Oscillations. Using Information and Communication Technologies together with the use of Video and Video Analysis Software, a working method could be implemented in which all the stages of experimental work were carried out. The results of the activities carried out at home by the students, communicated in the respective written reports, show that the proposed method for remote teaching of Laboratory of Physics is feasible and allows to carry out the process of non-face-to-face teaching at the higher education level.
Theoretical study of the movement of a mobile object in different trajectories with a coupled pendulum
Authors: Espíndola R , Valle G Del , Hernández G , Muciño D 
Published: March 2021

Abstract
Coupled systems are studied within classical mechanics. In this work, using the formulations of classical mechanics, such as the Lagrange and Hamilton formulations, we analysed the system composed of an object of mass M in motion, to which a pendulum of length l and mass m is coupled. We studied the movement of the object when it moves in a single dimension (y direction) with pendulum oscillations: 1) in 2D (zy-plane) and 2) 3D (surface xyz). Subsequently, the movement of the object is studied when it moves in a circle of radius R with the same oscillation conditions referred to for the pendulum.
Motion equations of a pendulum gear system
Authors: Díaz P. , Cid A. , Granados J. , Velázquez A. JM , Velázquez J. A. 
Published: March 2021

Abstract
This work presents a dynamic system that is composed of gears which have an angular velocity

θ
˙

. Each of the gears was added a rod of known length and mass which can move freely. This system can move in such a way that the rods oscillate as the gears rotate. With the Lagrangiana formulation, the motion equations that govern the system were built, differential equations were solved with standardized numerical methods and graphs were obtained in different phase spaces.
Evaluation of “X2” delination well drilling project block on oil service company
Authors: Sardjono W , Lahlianti RC , Hobri  , Tohir M , Mukhlis M 
Published: March 2021

Abstract
Project is an activity or business that is temporary and has a certain period of time, unique and produces a product, service or both. Achieving project activity right on the schedule was an important thing for project owners or contractors. However, the schedule of the "X2" Well Drilling Project has delayed from the original plan due to several inhibiting factors. Therefore, the cost’s project increased during project implementation. The factor analysis method is used to reduce the number of independent variables until new variables are found which are then examined for their relationship and a mathematical model is built using the regression analysis method. The location of this research was one company with 100 valid respondents. The results of this study indicate that there are 3 (three) new factors that have a positive effect and 1 (one) new factors that have a negative effect on the condition of the differences that occur. If a project can be completed before the work period ends, at other times if the owner wants to build a construction project again, there is no doubt that the owner will re-choose Oil Service Company to work on another Drilling Project.
Timing pulse code modulation as a tool for quantization noise reduction in special-purpose IT systems
Authors: Hordiichuk V , Shyshatskyi A , Korchinskyi V , Kildishev V , Pozdniakov P 
Published: March 2021

Abstract
The aim of the article is to examine the issue of eliminating quantization noise in the process of analogue-to-digital conversion by means of timing pulse code modulation. According to the results of the method proposed, it has established that the use of timing modulation significantly increases the number of sampling levels at a given interval without reducing the duration of individual code pulses, that, in its turn, significantly improves signal quality (readability) after the digital-to-analogue conversion on the receiving side.
The influence of electromagnetic waves and laser fields on conductivity tensor for the case of electron - optical phonon scattering in quantum wells with a parabolic potential
Authors: Ngoc H V 
Published: March 2021

Abstract
This paper studies the influence of electromagnetic waves and laser fields on conductivity tensor with the case of electron - optical phonon scattering in quantum wells. Because electrons are confined in the quantum well in one direction, the conductivity tensor in the quantum well is different from the conductivity tensor in the bulk semiconductor. The carrier system in a quantum well is located in an electromagnetic wave field and a laser field. Using quantum kinetic equation for electrons in quantum wells in the presence of an electromagnetic wave and a laser field, from the quantum kinetic equation it is possible to calculate the conductivity tensor. The conductivity tensor expression is a function of the electromagnetic wave frequency, laser field frequency and quantum well characteristic parameters. Survey and plot the dependence of conductivity tensor on electromagnetic wave frequency, laser field frequency, laser field amplitude with GaAs / GaAsAl quantum well case.
Development of mathematics learning tool based on open-ended with jumping task and the effects on creative thinking ability of junior high school students
Authors: Ummah B I , Susanto  , Hobri  , Solehah A 
Published: March 2021

Abstract
This study aims to develop a learning tool based on open-ended with jumping task on the material of the system of linear equations in a two variable for grade VIII junior high school students and to determine the effects on students’ creative thinking ability. This research was mixed method, which combines qualitative research and quantitative research. The development model used in this research is Thiagarajan which goes through four stages, namely define, design, develop, and disseminate. Meanwhile, for experimental research using quasi experimental design, namely pretest-posttest for non equivalent control group design. The subjects of this study were students of Islamic Junior High School Wahid Hasyim Balung. Two classes were selected as the research sample, class 8A as the experimental class and class 8B as the control class. Students’ creative thinking abilities were measured using tests of creative thinking ability. The results showed that learning tool based on open-ended with jumping task met the criteria of validity, practicality, effectiveness, and had a significant effect on students’ creative thinking ability.
Development of lesson study for learning community based learning tools using google classroom media and its impact on students’ creative thinking skills
Authors: Hasanah N , Hobri  , Fatekurrahman M , Kusuma M A , Hadiyanti N F D 
Published: March 2021

AbstractLearning mathematics is a science that is learned as a very important basis for everyday life the lesson study for learning community learning process that prioritizes group learning that involves peers in learning so that the creative thinking process between students increases. Along with the development of very sophisticated technology demands online-based learning to facilitate the learning process and able to support students’ creative thinking which can be measured from fluency, flexibility, originality and elaboration. The research aimed to develop lesson study for learning community based learning tools using google classroom media on three-variable linear equations material for X grade high school students and to determine the effect on students’ creative thinking abilities. This research uses a mix method with a sequential Explorstorydesign combination model with a thiagardjan development model through the 4D domain, which are define, design, develop and deseminate inexperimental research using the nonequivalent control design with the results obtained from the pretest value functions to determine the initial knowledge and posttest for knowing knowledge after being given treatment. The results showed that the lesson study for learning community based learning tools using google classroom media were valid, practical and effective and had a significant impact on creative thinking.
Development of mathematics learning tools with Realistic Mathematics Education-Jumping Task (RME-JT) and its effect on the mathematic communication skills
Authors: Sa’id I A , Pambudi D S , Hobri  , Safik M , Insani K 
Published: March 2021

Abstract
This research focus on the development of learning based on realistic mathematics education approach with Jumping Task questions. The develop learning are related to the real life of students, so that students can be expected to enjoy and like mathematics. The develop learning consist of lesson plan, worksheet, and learning test. This research used mixed method, both combine development and quantitative research. The model study is Thiagarajan 4D by using independent test analysis. The results showed that realistic in learning mathematics education approach-Jumping Task has a good quality practice, efektive, and fulfill the criteria of validity. On learning process using realistic mathematics education approach, the students are more active, enthusiasm and motivation so that it has a positive impact in improving students’ mathematics communication. Significant value is 0.000 (p <0.05)..
Developing of learning tools based on science, technology, engineering, and mathematics (STEM) based on learning community to improve critical thinking ability in class X student’s arithmetic sequences and arithmetic materials
Authors: Insani K , Hobri  , Prihandoko A C , Sa’id I A , Safik M 
Published: March 2021

Abstract
This study aims to develop learning-based tools science, technology, engineering, and mathematics (STEM) based on learning communities for improve critical thinking skills in arithmetic sequence and series material. The learning tools developed were RPP, LKS, and THB. Method which used is development with the Thiagarajan development model through four stages, namely define, design, develop, and disseminate. The subjects of this research are students SMKN 2 Bondowoso class X. Students’ critical thinking skills are measured using learning outcomes test. This research is to describe the development process and test results validity, practicality, and effectiveness. The results of this study produce a device learning that meets valid criteria which is practical, and effective.
Developing gamification based biology learning materials for senior high school students in industrial agricultural area in jember, indonesia
Authors: Siswati B H , Prihatin J , Kuswati  , Damayanti A F , Nafisah L 
Published: March 2021

AbstractThis research aimed at describing the feasibility of gamification-based biology learning materials for senior high school students in the industrial agricultural area in Jember, Indonesia. The feasibility was based on the content validity, construct validity, and student responses. The development procedure of the learning materials used Plomp’s development model which consisted of the preliminary investigation - design - realization - test, evaluation, and revision – implementation stages. The learning materials developed in this research were the syllabus and lesson plans, material modules, gamification modules. The research data were collected using interviews, observation, tests, questionnaires and documentation. The feasibility of the developed learning materials obtained very feasible criteria based on the average score by the expert team. Therefore, it can be concluded that the learning materials developed in this research are very feasible to be implemented in schools viewed from the content validity, construct validity, and student responses.
Early detection of the financial crisis in Indonesia, Thailand, and South Korea based on real exchange rates
Authors: Ratnasari A , Sugiyanto  , Sulandari W 
Published: March 2021

Abstract
The 1997 Asian financial crisis and the 2008 global financial crisis had a significant impact on the economies of various countries, including Indonesia, Thailand, and South Korea. Therefore, this study aims to detect early financial crises in these three countries based on real exchange rate indicators. The early detection of financial crises, relevant institutions in applying appropriate policies. Thus, financial crises can be avoided. The real exchange rate indicator contains fluctuations, and changing conditions. As a solution, the volatility models, i.e. autoregressive conditional heteroscedasticity (ARCH) and generalized ARCH (GARCH) explains volatility or fluctuations, and Markov switching (MS) explains changing conditions. The combination of these models yields a smoothed probability value used for detecting financial crises. The real exchange rate of Indonesia, Thailand, and South Korea data against the United States were used from January 1990 to March 2020. The results showed that MSARCH( 2,1), MS-ARCH(2,1), and MS-GARCH(2,1,1) are for Indonesia, Thailand, and South Korea, respectively. The real exchange rate indicator can detect crises in Indonesia and South Korea in the 1997 and 2008. Whereas in Thailand, it was only able to detect crises occured in the 1997. The prediction results of the smoothed probability showed no signal of the financial crisis in Indonesia, Thailand, and South Korea one year later.
Data literacy of high school students on physics learning
Authors: Suryadi  , Mahardika I K , Supeno  , Sudarti  
Published: March 2021

AbstractData literacy is the ability to collect, understand, manipulate, and use data. Based on the viewpoint of cognitive skills, data literacy is related to the ability to collect, filter, select, analyse, interpret, critique, visualize, and communicate data. This ability is essential for students to have, especially in solving learning physics and everyday life problems. Data literacy is indispensable in the life of the modern world like today. Students who have good data literacy will understand and assess data critically, whether presented in tables, graphs, or charts. The purpose of this study is to determine the data literacy of high school students in physics learning. Data were collected through the measurement of data literacy using written tests. Measured data literacy included students’ ability to collect, analyse, interpret, implement and evaluate data as well as assess data quality. The results show that high school students’ data literacy in physics learning is still in the unsatisfactory category. Various efforts must be made so that data literacy for high school students can be develop, i.e., by implementing learning strategies and using appropriate learning resources. Another action that can be done is to apply a teaching model that follows the characteristics of 21st-century learning.
Developing textbook based on scientific approach, critical thinking, and science process skills
Authors: Rofieq A , Hindun I , Shultonnah L , Miharja F J 
Published: March 2021

Abstract
Several researchers have done the development of textbooks as a source of learning. However, most only partially develop students’ academic abilities. This study aims to develop biology textbooks based on a scientific approach to improve students’ critical thinking and process skills. This mix-method research consists of research development and quasi-experiment. Model development refers to modifying the Borg & Gall development model, which consists of preliminary studies, model development, and model testing, whereas the quasi-experiment uses the pretest and posttest groups design. This study’s population were all students of Kepanjen Islamic High School, while the sample involved was 24 students of class X MIA. The data collection method used expert questionnaire validation, pretest, and posttest. Data analysis used the dependent t-test with a significance level of α = 0.05. The model test results show that there were significant differences in the average between pretest and posttest scores. Besides, the validation test results indicate that teaching materials were declared appropriate and effective in learning.
Development of mathematics e-module with STEM-collaborative project based learning to improve mathematical literacy ability of vocational high school students
Authors: Hadiyanti N F D , Hobri  , Prihandoko A C , Susanto  , Murtikusuma R P , Khasanah N , Maharani P 
Published: March 2021

Abstract
The research conducted was a research on media development in the form of electronic module in mathematics learning using a STEM-Collaborative Project Based Learning model which is believed to improve the mathematical literacy skills of vocational high school students. The test subjects in this study were students of Vocational High School 1 Panji Situbondo where the data analysis technique used in this development research was descriptive analysis techniques. The quantitative data that had been obtained from the Likert scale measurement were converted based on the weighted score that has been determined. This data is quantitative data which were further analyzed by descriptive statistics. The scores obtained from the questionnaire were then converted so that the eligibility percentage was known and the conclusion that the e-module developed was valid, practical and efficient. The benefit that could be obtained from this research was the contribution of thoughts to improve the quality of education, especially in mathematics learning by presenting new insights regarding the preparation of learning tools in the form of e-modules as an alternative to learning media for mathematics to improve the quality of the learning process.