bluuebunny/crossref_metadata_2025_split huggingface dataset:
Cubic fitting method of wavelength shift of optical fiber grating temperature sensor and a temperature measuring device
Authors: Chengyou Wang , Yajun Deng , Peng Wei , Haijun Xue 
Published: June 2019

Abstract
The center wavelength movement of fiber grating reflecting is not strictly linear relationship with the measured temperature due to the influence of grating materials, fiber materials, packaging and other factors. This makes the fiber Bragg grating temperature sensor produce error. In order to improve the accuracy of temperature measurement, the more mature method is to use the conic fitting method to correct the error. This method has good temperature measurement accuracy in the medium-low temperature region (-20.0∼80.0°C). But the error of the medium-high temperature region (80.0∼140.0°C) increases gradually. In this paper, the cubic fitting method of wavelength shift is proposed and a temperature measuring device is developed by using this method. The method selects the center wavelength of the reflected light at the temperature of 0° as the reference wavelength and The measured temperature is fitted with the cubic polynomial of the shift Δλ between the reflected wavelength and the reference wavelength. The temperature measurement experiment shows that this method improves the temperature measurement accuracy of the medium-high temperature zone under the premise of calibration in the medium-low temperature zone.
The Principle and Application of Optical Fiber Sensing Technology: Three Kinds of Distributed Sensing and Fiber Bragg Grating
Authors: Yuan Gao 
Published: June 2019

Abstract
In modern society, optical fiber plays a significant role in ordinary people’s life. The development of optical fiber communication is so fast while the optical fiber sensing has gained huge achievements although fewer people know about that. In fact, optical fiber sensing technology has become increasingly popular due to its low price and the fact that this method overcomes the problems encountered with traditional sensor, such as in the high-intensity magnetic field. Meanwhile distributed sensing enables the all-day and all-spots monitoring. Based on different principles, distributed optical fiber sensing could be classified into three kinds, which are optical time-domain reflectometry based on Rayleigh scattering, Raman-optical time-domain reflectometry based on Raman Scattering and Brillouin-optical time-domain reflectometry based on Brillouin scattering. These three methods have their own benefits and applications because of their special structures. Fiber Bragg grating can be taken as one kind of optical fiber sensor as well as the grating locates inside the optical fiber. Relying on the diffraction effect, FBG can measure temperature, strain and even pressure sensitivity. The demodulation methods of FBG are various as well. There are about 8 different methods that can meet different requirements, each with its own benefits and defects.
Control of Powder Material Automatic Batching System based on PLC
Authors: Yang Xinjun , Kong Lingyu , Wang Ying , Xu Feng , Zhu Xiaqing 
Published: June 2019

Abstract
Aiming at the characteristics of powder material, such as easy to dust, easy to leakage, polluting the environment and harmful to human body, an automatic batching system for powder material is designed. The system adopts a quantitative weighing device with buoyancy weighing sensor as the core, feeding with electric vibration feeder and 16 small cups. Simatic S7-1200, the latest generation of Siemens PLC, is used to control the system. 2304HS42A1 motor of Hamderburg Company, Germany, is used to control the movement of the cup on the workbench. The software control scheme of the system is designed. Practice has proved that the system runs stably and has good performance, which is worth popularizing.
Study on Emission Characteristics of Hydrogen Direct-Injection Gasoline Engine
Authors: Liang Jinguang 
Published: June 2019

Abstract
Experiments have been carried out on a hydrogen direct-injection and gasoline port-injection engine at the conditions of locally rich hydrogen and lean-burn mode in order to study the effect of hydrogen fraction and air-fuel ratio on the engine’s emissions. The experiments results demonstrated that when the excess-air ratio was increased from 1 to 1.8, NOx and CO emissions were at least decreased by 91% and 95% respectively and HC emission was increased by 56%. Almost 23% reduction was observed in HC emission when hydrogen fraction changed from 3.9% to 10.5%, whereas the NOx emission has almost been tripled and CO emission is found to be less affected with hydrogen fraction.
A Multi-Channel Data Acquisition System for Capacitive Sensing
Authors: Li Jianke , Zhao Yanxia , Li Jianfeng , Hu Aihua , Wei Ruoyan , Zhang Changshui 
Published: June 2019

Abstract
Capacitive sensing can be applied to a variety of applications. A multi-channel data acquisition system for capacitive sensing was designed based on an FDC2214 with external L-C resonators. The FDC2214 was used for capacitance-to-digital converting by measuring the ratio of the resonator frequency to a reference frequency. Employing MSP430F5529 as host processor and the two-wire I2C serial bus interface connected with the FDC2214, the system implemented multi-channel data acquisition. As a test system, an 8-channel physical hardware device was provided. Experiments for gesture recognition had been done using the 8-channel capacitive sensing data acquisition system. The good experimental results verified the availability of the designed system.
Influence of Turning Parameters on Surface Integrity of D840 Wheel Material
Authors: Yu Lang , Quan Yanming , Liu Peijie , Wan Junjie 
Published: June 2019

Abstract
The machined surface integrity of heavy-haul freight wheel is one of the direct factors which affects the wheel’s service performance and life. Based on the wheel turning parameters, single-factor experiments on D840 wheel material under dry cutting condition were performed. The changing laws including the surface work hardening, surface microstructure, surface roughness, and surface morphology were analyzed via micro-hardness tester, metallographic microscope, SEM and surface profilometer under different cutting parameters. The results show that the surface hardness and the hardening layer increase with the increase of feed and cutting depth within a certain range of cutting parameters. The surface amorphous layer and fiber layer thicken with the increase of feed and cutting depth. The fibrosis of proeutectoid ferrite in the plastic deformation layer and the extrusion deformation of the flake pearlite are obvious. Meanwhile, pearlitic lamellar spacing decreases gradually. The surface roughness increases with the increase of feed, and cutting speed a cutting depth have less effect on roughness.
Preliminary Study on Teaching Reform of Automatic Welding Practice Based on K5 Teaching Method
Authors: Qin Song , Xiaoming Tian 
Published: June 2019

Abstract
With the continuous development of automation technology, the teaching of automation technology in colleges and universities currently plays an important role. For example, in the process of automated welding practice, students are required to complete the practical hands-on ability of automated welding technology through the orderly teaching, and master the relevant theories of automated welding technology.
Advanced Heat Treatment Equipment Technology And Product Development of Metal Materials
Authors: rile Ge 
Published: June 2019

Abstract
From the current analysis of steel materials in the field of heat treatment and offline heat treatment, the implementation of advanced heat treatment equipment and processes for automated metal materials in China has carried out numerous innovations. In order to improve the technical level of localized equipment and promote the continuous development of new industrialization processes, the use of green manufacturing processes to achieve heat treatment of steel and non-ferrous metals is the focus of current research. This paper focuses on the analysis of advanced heat treatment equipment, process and product development of metal materials, and proposes to adopt green manufacturing concept and carry out research and development on advanced heat treatment equipment and technology of metal materials. It is expected to have reference value for improving rolling technology and continuous rolling automation in China.
Development of Karmana-Problem Based Learning Modelto Train Problem Solving Skills and Concept Mastery of Biology Teacher Candidates
Authors: Karmana I W , Ibrahim M , Susantini E 
Published: June 2019

Abstract
Problem solving skills and concept mastery are the most essential skills in the 21st century. In relation to that, the purpose of this research is to develop a learning model, namely Karmana-Problem Based Learning (K-PBL) model to train the problem solving skills and concept mastery of biology teacher candidates. This is a research and development by using the Borg and Gall model design, which will produce a product, that is the K-PBL model is valid, practical, and effective. The validity of the model is assessed by validator, practicality is assessed using observation sheet of learning scenario and students activities,and the effectiveness is determined based on pre-test and post-test problem solving skills and biology concept mastery. The data technique analysis is descriptive-qualitative.The results of this resarch show that the developed learning model (K-PBL) is determined to be valid by the validator with a reliability score of 0,91 (reliable) with the syntax assessment: 1) Knowledge; 2) Advance organizer; 3) Review; 4) Management strategy; 5) Acting; 6) Note and presentation; and 7) Asessessment, including learning tools and instruments have been declared valid. Furthermore, the implementation of the learning model (try out) in biology education students of IKIP Mataram is declared to be practical because the percentage of learning implementation reaches 100% with reliability 0,97 (reliable), and the percentage of student activity also reach 100% with reliability 0,98 (reliable). In addition, the obstacles in learning that arise can be overcome. The model was also declared effective due to an increase in problem solving skills with a high grade 0.71 N-Gain score, concept mastery of the students achieve a high grade 0.73 N-Gain score with students responses to K-PBL model categorized positively (91,7%). It can be concluded the K-PBL model is valid, practical, and effective to train problem solving skills and concept mastery of biology teacher candidates.
The Effects of Using Multiple Representations on Prospective Teachers’ Conceptual Understanding of Intermolecular Forces
Authors: Widarti H R , Marfu’ah S , Parlan  
Published: June 2019

Abstract
Intermolecular force is one of study material in Organic Chemistry I course, which involves numerous representations. This study aimed to find out the effects of using multiple representations on prospective teacher’s conceptual understanding of intermolecular forces. The research method used in this study was a quasi-experiment. The research subjects were 56 second-semester chemistry education students batch 2017-2018 in Universitas Negeri Malang which enrolled in Organic Chemistry I course. The research subjects are grouped into two classes including experimental and control classes with 28 students each. The experimental class was taught with the multiple representations-based learning, while the control class was taught using an expository learning. The measuring instrument included 6 question items with three-tier test question type and a reliability of 0.639. The research result showed there was a positive effect on the use of multiple representations-based learning. This can be seen from the existence of a difference in experimental and control classes’ conceptual understanding. The conceptual understanding of intermolecular forces in the experimental class (mean 55.93) was higher compared to the control class (mean 36.96).
Socio-scientific Issues (SSI) in Chemistry Education: Enhancing Both Students’ Chemical Literacy & Transferable Skills
Authors: Rahayu S 
Published: June 2019

Abstract
Chemistry education has tasks to guide students to be future employment within the field of science and enginerring and also to provide societies with many opportunity for chemistry-related career. However, there are some challenges faced by chemistry education, such as lack of transferable skills of chemistry graduates, education reform on the need for scientifically literate citizens and for reducing the shortage in participation and interest of young people in science and engineering. One possible way to solve such challenges is that we could use socio-scientific issues (SSI) as a context to be integrated in a chemistry instruction. Through socio-scientific issues related chemistry, both scientific literacy and transferrable skills could be enhanced. This paper discuss potency socio-scientific issues in developing the skills and how to incorporate it in the instruction.
Interactive Task Development of The Area and Perimeter of Rectangle to Reduce The Anxiety of Secondary Students in Doing Mathematics Task
Authors: Nasution S H , Qohar A , Susiswo  
Published: June 2019

Abstract
This article discussed the interactive task development of the area and the perimeter of a rectangle to decrease the anxiety of secondary students in doing Mathematics task. The purpose of this development was producing an interactive task of rectangle area that was valid and effective to decrease the students’ anxiety in doing mathematics task. The development consists of three phases, they were: (1) Analysis phase, (2) design phase, and (3) development phase. The product that developed was validated and tested in a small scale with five trial subjects. The validator concluded that the validation product was valid. Furthermore, the trial result in small scale concluded that the product could decrease the anxiety of secondary students in doing Mathematics task.
Students’ Mathematical Thinking Process Involving Equal Signs
Authors: Tomé A O , Purwanto  , Sa’dijah C 
Published: June 2019

Abstract
The purpose of this research is to know the process of students’ mathematical thinking in solving mathematics problems involving equal sign. The method used in this research is descriptive qualitative using two stages such as testing and interviewing. This research was conducted at Sekolah Dasar Islam Surya Buana Malang and held at 5th grade involved 30 students, after having the test, will be continued the interview. The interviewed was conducting with two students who choosed based on the communication’s ability; so the students be able to explain the responding that has been given. Based on the result of this study most students understood that the equal sign as a symbol to obtain the results of a calculation. This result also shows that there are students who can understand equal sign as equality, however that understanding just limited to the equal sign with closed type, while in open type all students did not understand. It can be concluded that students more understand the equal sign as an operational symbol. This result is suggested to the teachers to introduce the meaning of equal sign to students especially relating to equality.
Students’ Thinking Interference in Understanding Functions
Authors: Hidayanto E , Budiono E 
Published: June 2019

Abstract
This paper aims to describe students’ thinking interference when studying function material. The study was conducted by analyzing the work results of 6 students of Mathematics Education Study Program FMIPA State University of Malang in the 6th semester about the function material. The results of the study show that students think interference when they understand the functions with verbally, symbolically, and diagrams.
Shadow Supervisor Strategy on Student with ADHD in Mathematics Learning Activity for Inclusive Secondary Class of Elementary School
Authors: Marlina R , Budiyono  , Usodo B 
Published: June 2019

Abstract
The purpose of this study is to describe and analyze the strategy of Shadow Supervisor in mathematics learning for student with Attention Deficit/Hyperactivity Disorder (ADHD) in inclusive secondary class of elementary school. Learning strategies include models, approaches, methods and learning techniques. This is a qualitative research (field research) with purposive sampling. The samples are special supervisor (shadow) and student with ADHD. The instruments used are observation and documentation. The results showed that for basic competence to sequence of numbers and stepping number (number pattern), a place value number system, addition and subtraction, time measurement (clock reading), and two-dimentional figure grouping, the learning model used was behavioristic. The approach is synthetic, spiral and intuitive in accordance with the basic competencies being taught. The learning method used were question and answer, drilling and exercises, games and stories, and assignment. Learning techniques used was vary according to the basic competence of learning materials.
Implementation of Creativity Problem Solving Model Using E-Learning in Applied Graph Theory Course
Authors: Wahyuningsih S , Satyananda D , Octoviana L T , Nurhakiki R 
Published: June 2019

Abstract
One of learning alternatives that can be applied to improve students’ activity and creativity is e-learning.. Implementation of e-learning for applied graph theory course used e-module for course material, e-portfolio for student assignments, and online-based tasks that can be accessed by other students, hence it is could be as a pioneer of wider implementation of online learning. In applied graph theory course, students needed to have direct experience in solving problems in related industries/institutions. From direct application experience in the field, students raise problems, model problems in the graph, and determine appropriate methods to solve the problem. Creative thinking process could be identified from students’ problem solving task by using Creative Problem Solving (CPS) model. There are four indicators of main step (understanding the challenge, generating ideas, preparing for action, and planning approach) and eight minor step indicators (constructing opportunities, exploring data, problem framing, generating ideas, developing solutions, building acceptance, appraising tasks, and designing process) in the recent version. Purpose of the paper is to analyze result of CPS model implementation, and to discuss student’s responses to the implementation. By implementing the CPS model through e-learning, it could be identified that student’ s creativity in real problem solving were good. The questionnaire indicated that the student response strongly agree with the implementation of this learning to develop creativity.
The Effect of the ELPSA Framework on Students’ Ability to Solve Function Problems
Authors: Nissa I C , Sanapiah  , Yuntawati  
Published: June 2019

Abstract
Mathematical functions are good to learn for solving problems in everyday life associated with the "input" and "output" processes. Mathematically, functions are expressed in terms of formulas. Students may be able to determine the functional value of a given function formula for an input value, but most students still have difficulties to do otherwise. The difficulties faced by students are related to the ability to transfer problem in context to mathematical problem. ELPSA (Experience, Language, Pictorial, Symbolic, Application) is a framework that views learning as an active process in which students build their own way of knowing (developing understanding) through both individual thinking and social interaction with others. This is an experimental research to measure the effect of mathematics teaching by using ELPSA framework on students’ ability to solve function problems. The samples of this study were the 8th grade of Aletheia Christian Junior High School at Mataram city, West Nusa Tenggara. This research used a quasi-experimental with non-equivalent control group design. Data were collected by giving a test and observations during the learning process taken place. Data were analyzed by using data analysis tools in Microsoft. Based on the results of statistical tests and observations of students’ performance during the mathematics learning process, then there was significant effect of the ELPSA framework on students’ ability to solve function problems. Furthermore, it is can be used as a reference for mathematics teachers to use ELPSA framework as an innovative strategy of teaching mathematics in improving students’ problem solving skills.
An Analysis of Students’ Creative Thinking Skill in Creating Open-Ended Mathematics Problems Through Semi-Structured Problem Posing
Authors: Titikusumawati E , Sa’dijah C , As’ari A R , Susanto H 
Published: June 2019

AbstractThis study aims to analyze how students of Mathematic Education study program in one of tertiary education providers in Salatiga Regency, Indonesia, creates open-ended problems via semi- structured problem posing. A qualitative descriptive method was employed to study a population of research subjects that had been selected through a stratified random sampling based on their academic ability level. As many as 30 students were categorized into Upper Level Academic ability (AA), Average Level Academic Skill (AS), and Lower Level Academic Skill (AB). Three students from each category: AA, AS, AB, were randomly selected as the research subjects. Their creative thinking skills were measured by the number of problems, strategies, and variations of open-ended problems and its solutions that had been created by students as representations of creative thinking aspects: fluency, flexibility, originality and elaboration. Results show that AB students had under developed creative thinking skills, while AS students began to develop their creative thinking skills, and AA students demonstrated their developed creative thinking skills.
Student Algebraic Reasoning to Solve Quadratic Equation Problem
Authors: Damayanti N W , Purwanto  , Parta I N , Chandra T D 
Published: June 2019

Abstract
The reasoning is closely related to students’ mathematical abilities. Reasoning becomes a key element in mathematics learning. The student’s reasoning habits need to be developed. Competence in algebra is important. Algebra is one branch of mathematics that an essentials role in mathematics education. Algebra was prerequisite for higher studies mathematics and science courses, and a lack of algebra skills have a chance results in poor performance in courses The purpose of this research is to describe students’ algebraic reasoning in solving quadratic equation problem. The method used in this research is descriptive qualitative. Research subjects were three students of class X. The results in the study showed that students use a different strategy in solving the problem of quadratic equations. This can make a description of the existing schema. There are also students who misunderstand the concept of understanding operations in algebra so that this can affect their reasoning process and makes their answer incorrect.