bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Gearbox Fault Diagnosis Based on Vibration Signal Hilbert Demodulation
Authors: Li Dasheng , Ye Hongling , Li Yuqing
Published: June 2019

Gears are often prone to typical faults such as broken teeth, pitting, tooth surface wear and shaft bending in harsh environments. These faults not only have different failure modes, but also have different vibration signal characteristics. Vibration signal analysis method is one of the most effective and adaptable methods in gearbox fault diagnosis analysis method. Based on the analysis of gearbox failure mechanism, this paper verifies the typical fault diagnosis of gearbox based on Hilbert demodulation analysis through specific experiments, the application of which provides an important reference for accurate gearbox fault diagnosis.
A Mass Sensor Based on Two Complete Synchronized Optomechanical Oscillators
Authors: Jin Leisheng , Li Kaiwen , Fang Yuming
Published: June 2019

In this work, we study the realization of stable complete synchronization in two coupled optomechanical systems with a master-slave configuration. By taking the open-plus-close-loop method as coupling scheme, it is verified that the mechanical and optical mode in the coupled systems with parameters mismatched can be simultaneously synchronized both in linear and nonlinear regime, and even in chaotic state. Based on the achieved complete synchronization, the coupled systems are then explored in mass sensing applications. By taking one of the coupled as sensing part, we develop the coupled system setting in complete synchronization as a mass sensor. It is revealed that a tiny mass added on the sensing part will lead to desynchronization, and the quantities of added mass can be determined by calculating a designed similarity measure.
Construction of power loss equation for intelligent car based on maximum likelihood estimation
Authors: Zhu Ran , Yang Wei , Cao Shun-xia
Published: June 2019

Aiming at the integrated control system of intelligent car and shore control center, revolving around high frequency wireless transmission control, this paper introduces the concept of maximum likelihood estimation (MLE), and proposes a power loss equation construction method of the intelligent car based on frequency domain transformation. Proceeding from frequency domain model, the influence of the corresponding parameters on path loss performance of received power which reaches the intelligent car is simulated and analysed in this paper. From simulation results of the frequency domain model, when the incident angle, α, is 0.4π, the corresponding received power path loss to the intelligent car is minimized. The result reflects the smallest received power path loss to the intelligent car and the impact on the system performance.
Large-scale corn header design with adjustable line spacing and lifting cylinder motion simulation
Authors: Cao Zijian , Cao Shukun , Xu Xiangqian , Han Tao , Guo Hejia , Xu Shuqiang
Published: June 2019

Existing large corn harvester headers have inflexible walking, fixed line spacing, and cannot be well applied to the harvesting requirements of different line spacings.Based on the existing header, the header is designed to be foldable and the line spacing is adjustable.The dynamics analysis software ADAMS was used to simulate the hydraulic cylinder of the lifting header.The results show that under uniform load, the connection between the hydraulic cylinder and the vehicle body and the connection between the hydraulic push rod and the conveying bridge are large, and the lifting speed is positively correlated with the force. The offset load has an influence on the force of the motion pair and has the greatest influence on the force between the hydraulic push rod and the transport bridge. When the strength check is performed, attention should be paid to ensure that the strength and life reach the design requirements.
Application of Load Optimization Control of Thermal Power Unit Based on the Characteristics of Regulating Valve
Authors: Li Jun , Li WeiWei
Published: June 2019

In the long-term operation of thermal power units, the nonlinear and more complex viscous faults often occur in the regulator valve, which have obvious adverse effects on the dynamic performance of the load control. By using two point line models and Presiach models that are switched to each other to describe the switch asymmetry of the regulating valve and the different viscosity characteristics, the viscous fault of the regulating valve is effectively diagnosed, and the statistical consistency of the estimated values of model parameters are proved. Several key control technologies of thermal unit are given, and the control method of compensating the viscous fault of the regulating valve is presented, which weakens the adverse effect of the non-linear characteristics of the control valve on the dynamic control performance, and makes the main variables such as main steam pressure of unit achieve good dynamic performance.
Structure of Tunnel Digging and Loading Trolley and Calculation of Electronic Control System and Analysis of Common Faults of Electronic Control
Authors: Yi Zhang Mao , jun Zhang qi
Published: June 2019

The tunneling truck is mainly used for tunneling construction. It has the functions of digging, loading, anchoring, and wet spraying.This paper analyses the main structure and working principle of tunnel digging and loading trolley, the selection and calculation of main electrical components, the overall calculation of tunnel digging and loading trolley, and the common electrical faults and troubleshooting methods. It has certain reference value for domestic counterparts.
Research of the head equivalent velocity in the simulation of human-vehicle collision accident
Authors: Zhao H G , Hao B Q , Li C S , Yang N
Published: June 2019

In this paper, the equivalent velocity of head model based on HIC value is studied. Firstly, based on the existing pedestrian model, a large number of experimental simulation and statistical analysis have been completed after modification, and the functional relationship between HIC value and vehicle pedestrian contact speed has been obtained. Then, a separate head model is established according to the contact characteristics of the original dummy model, and the functional relationship between the HIC value and the collision speed when the head hits the windscreen is obtained by simulation, and the equivalent velocity relationship between the collision speed of the head model and the human-vehicle contact speed is deduced. Finally, according to the existing finite element head model and the coupling calculation method, the simulation results under the coupling calculation condition are explored. The equivalent velocity relation proposed in this paper has guiding significance to the value of collision velocity in the head collision model and also promotes the development of research on human-vehicle collision accidents.
Product thinking and system concept of ecological design
Authors: Qingli Wang
Published: June 2019

This paper discusses and analyzes the product thinking, system concept and future development of the ecological design. The research on the core issues of ecological design aesthetics focuses on dealing with good people and products. Although design also requires freedom of creation and subjective expression, such freedom and expression are limited and must meet the objective requirements.
Research on head-neck injuries of pilots during emergency ejection from the aircraft
Authors: Song Run-Zi , Suo Shuang-Fu , Jia Xiao-Hong , Liu Yue , Liu Song-Yang
Published: June 2019

This paper established a multi-body dynamics model of head-neck using LifeMod. To explore the damage of pilots’ head-neck during the ejection process, we used the established model to do simulation combined with the seat and helmet multi-body model. The head-neck model was validated through the volunteer frontal-collision and rear-collision tests, whose head acceleration, displacement curve and response time are in good agreement with the experimental data. The simulation showed that the head-neck is the most vulnerable to injury, when the head lean forward to the limit position and collide with headrest due to airflow. The results of various simulation calculations implied the head-neck protective device should be installed to avoid pilots’ neck damage in the ejection.
Research on Association of 95598 Customer Service Work Orders Based on Sequential Frequent Pattern Mining
Authors: Xin Xu , Jun Fu , Zhijie Sun , Li Wang , Xiaowei Liu. , Zhiguo Li.
Published: June 2019

With the continuous development of social economy and people’s living standard, people’s demand for electricity is also increasing day by day, as well as the demand for power supply capability of power supply enterprises and service level of staff. This has brought greater pressure and challenges to power supply enterprises, and the most prominent challenge is how to deal with customer complaints. In order to reduce customer complaints, it is necessary to predict whether customers will complain in the future according to the call track of customers who have already reflected their demands. Therefore, in complaint prediction, frequent pattern mining based on customer call track is particularly important.
Technical Analysis and Application Scene of Blockchain Society
Authors: Si Wen , Zhang Jiankang
Published: June 2019

There are many problems in the current social, it’s urgent to build blockchain society. As a distributed consensus system, blockchain can effectively solve four problems: storage, transmission, expansion and consensus. Especially the blockchain system has the characteristics of decentralization, its information is open and can not be tampered with. Its data exchange is based on cryptography to ensure the accuracy of the data. Blockchain technology can also enhance the efficiency of notarization and certification. These advantages make the blockchain society a necessity for the development of blockchain technology and a model for the transformation of social production and life style. Its application scenarios includepayment of remittances, free trade, equity settlement, intelligent contracts, authentication, audit profession, crowd-funding, bill business, asset-confirming and intelligent Internet of things, etc.
Analysis of Flowing in the Immersion Fluid Field under the Oscillatory Motion of the Silicon Wafer
Authors: Zheng Liang , Chen Yu
Published: June 2019

Immersion lithography has been leading the technology nodes to the sub-20nm regime in recent years. To extend immersion lithography to the sub-10nm technology nodes, the immersion liquid must remain highly pure and flow stably. In immersion lithography, a step-and-scan exposure system is utilized in which the silicon wafer is under an oscillatory motion during the exposure process. It could cause the non-constant flowing of the immersion fluid which affects the stable status of the immersion field and hinders the recycling of the immersion liquid. In this paper, effects of both scanning and stepping motions of the silicon wafer on the flowing of the immersion field are investigated and technical guidance can be obtained to have a high-quality and stable-flowing immersion liquid during the exposure process in the end. Results in this paper can provide theoretical and technical support to the further development of immersion lithography in the near future.
Investigation of Photothermal Effects on the Liquid Field during the Exposure Process in Immersion Lithography
Authors: Zheng Liang , Chen Yu
Published: June 2019

Immersion lithography has been extending technology nodes to the sub-20nm regime of semiconductor manufacturing. Keeping the immersion liquid pure and uniform as well as avoiding residual droplets during high speed scanning motion are two challenges faced by the development of immersion lithography. During the exposure process of immersion lithography, the heat of the incident beam may cause the temperature rise of the immersion fluid which could result in the image placement on the silicon wafer. For this reason, the photothermal effects of the immersion fluid field during the exposure process are investigated in this paper to ensure the high-quality and stable-flowing of the immersion fluid, and consequently the accuracy of the pattern image transferred on the silicon wafer. Results obtained in this paper can provide solid guidance and definitely accelerate the development the immersion lithography in the sub-20nm regime.
Research of Circuitous Hole Structure of Mineral-collagen Fibers in Tibia
Authors: Liu Yuxi , Li Aihua , Chen Bin
Published: June 2019

Through the observation of the microstructure of the longitudinal and transverse sections of the tibia, it is found that the distribution of mineralized collagen fibers is layered. There are many biological micropores in the cross section of the tibia, and the mineralized collagen fibers near the pores bypass the pores in an orderly manner, thereby forming a mineralized collagen fiber circuitous hole structure. According to the observation results, a finite element analysis model of fiber reinforced composites with fiber circuitous hole structure and drilling hole structure is established. The analysis results show that the maximum strain of the drilling hole structure and fiber circuitous hole structure are 6.428e-3 and 3.583e-3, respectively. The maximum strain of the drilling hole structure is about 1.8 times that of the fiber circuitous hole structure under the same load. The results have shown that the fiber circuitous hole structure of tibia has an excellent resistance to deformation, which can effectively improve the toughness of the tibia. The application of the structure to the composite material can effectively improve the strength of the composite material.
Motion control analysis of hybrid grinding and polishing machine tool for blade finishing
Authors: He Qiuwei , Zhang Chaopeng , Wang Xin , Qu Xingtian
Published: June 2019

Blade is the key component in the energy power equipment of turbine, aircraft engines and so on. Research on the process and equipment for blade finishing becomes one of important and difficult points. The motion control of hybrid grinding and polishing machine tool is different from that of traditional machine tool, and there exists motion coupling phenomenon when it moves as a whole. In order to control precisely motion of machine tool, the inverse and forward kinematics solution considering motion coupling of parallel mechanism was solved based on designed hybrid grinding and polishing machine tool for blade finishing in this paper. Firstly, the coupling factor of parallel mechanism was taken into account in the new model, and the inverse kinematics solution was modified to improve the solution accuracy. Then, the forward kinematics solution of machine tool based on inverse kinematics solution was solved. Finally, the motion simulation was made to verify the inverse and forward kinematics algorithm based on kinematic coupling factor of parallel mechanism by simulation software ADAMS. The simulation result shows that the inverse and forward kinematics solution deduced is correct, which provides theoretical basis for the motion control scheme of machine tool calibration and inspection control system.
Theoretical analyses of mechanical performance of higher-order vertex-based hierarchical square cell structure subjected to compression
Authors: Shi Chong , Wang Zhonggang
Published: June 2019

Hierarchical structure has gained great popularity in recent years, due to its significant promotion on structural strength and stiffness. In this study, the concept of high-order vertex-based hierarchy structure (VHS) was incorporated based on the new-rising multi-cell square tubes by replacing every vertex with scaled itself, layer by layer. The theoretical solution of VHS structure subjected to static compression has been conducted, based on the classical Super Folding Element. Mean crushing force ( MCF, P ) and energy absorption E have been calculated theoretically. The innovative finding lies that the relationship of the mean load between case leverito leveri+1 has been determined. The relationship of the mean load between case leverito lever i+1 mainly related to the cell number and length scale. All these achievements shield a light in aid to design novel thin-walled and light-weight energy absorption device.
Empowering Student’s Metacognitive Skill Through Cirsa Learning
Authors: Djamahar R , Ristanto R H , Sartono N , Ichsan I Z , Darmawan E , Muhlisin A
Published: June 2019

Metacognitive skill is the process of thinking about thinking, process of developing self-awareness, the ability to self-assess and how to learn and solve the problems at hand. An important dimension to the metacognitive process is the knowledge of thinking skills in planning, regulating, and evaluating an academic task. Metacognitive skill can be trained using a learning model, one of which is Cirsa, a learning developed by integrating a CIRC-based scientific approach. This study aims to measure and know the effect of Cirsa learning on students’ metacognitive skill. The research method used is quasi-experiment using pretest-postest nonequivalent control group design. The study involved 248 students, 8th grade on Biology subject at MTS Al Hidayah Citaringgul Bogor as the research sample. The development of metacognitive instrument refered to MAI (Metacognition Awareness Inventory). The results showed that Cirsa learning model had an effect on the students’ metacognitive ability with the sig value. of 0,000. Cirsa learning proved superior to CIRC (Cooperative Integrated Reading and Composition) and conventional learning on human digestive and excretory system topics. Teaching Biological topics with a scientific approach is a demand in the K-13. Therefore, the authors suggest teachers to develop students’ metacognitive skill with Cirsa learning which emphasize on reading and scientific-based activities.
Implementation of Problem Based Learning Combined With Think Pair Share In Enhancing Students’ Scientific Literacy and Communication Skill Through Teaching Biology in English Course Peerteaching
Authors: Wicaksono R S , Susilo H , Sueb
Published: June 2019

Based on previous researches, it was known that deciding a proper learning strategy is crucially needed to foster students’ 21stcentury skill through learning activities. This research is a classroom action research with two cycles and uses Lesson Study approach. This research aims to understand the implementation of PBL combined with TPS in enhancing students’ scientific literacy and communication skill. In this research there were one model teacher, four observers and twelve students as subjects. The first cycle was conducted in March 6th2018 while the second cycle was done in April 4th2018. Instruments used in this research are observation sheet for observers, worksheet with scoring rubric to measure students’ scientific literacy skill and students’ learning experience questionaire for students using Likert scale. The results show that students’ scientific literacy skill is increased from 50% in cycle 1 into 79% in cycle 2. Students’ communication skill is also increased from 54% in cycle 1 into 70% in cycle 2. Results from observers show that PBL combined with TPS enhances student’ learning activities and communication skills in class. It can be concluded that the implementation of PBL combined with TPS enhances students’ scientific literacy and communication skill.
Chemistry Teachers’ Views about Scientific Inquiry: A Study in East Java Province of Indonesia
Authors: Muntholib  , Pratiwi Y N , Yahmin  , Parlan
Published: June 2019

Scientific inquiry is a part of scientific literacy which is probably one of the main goals of science education. This paper reports a preliminary study on chemistry teachers’ understanding about scientific inquiry carried out using a Questionnaire of Views about Scientific Inquiry (VASI) with background of chemistry knowledge. Sample of the study is 32 chemistry teachers of senior and vocational high schools. Results showed that (1) the chemistry teachers held more informed views than science teachers reported in the previous study and (2) the pattern of chemistry teachers’ understanding about aspects of scientific inquiry is the same as senior high school students’ understanding. These indicate that (1) the complexity of leraning material people learned may be influences their inference ability and (2) the first year university chemistry students’ understanding of scientific inquiry are the strengthening of the perception they get from their teachers when they were school students.
Perception of Primary Mathematics Teachers on STEM-oriented Teaching and Learning
Authors: Mustam A A , Adnan M
Published: June 2019

This study aims to examine the perception of primary school mathematics on science, technology, engineering and mathematics STEM-oriented teaching and learning. The main focus of the study was on teachers’ perceptions towards STEM teaching and learning from aspects of general perception, training, implementation and STEM teaching information. Secondly, to identify the challenges faced by teachers during the implementation of STEM in the classroom. The sample for this study is 40 primary school math teachers throughout the country who answer random questions the Google form. The data were analysed using descriptive analysis. The findings show that early perception of STEM teachers is positive and teachers are prepared to face STEM teaching and learning process. Despite the challenges faced by the respondents, they are still working to teach in accordance with the curriculum prepared by the Ministry of Education Malaysia.
Mathematical Representation of Cerebral Palsy Students in Constructing the Concept of Plane Geometry Based on APOS Theory
Authors: Wulandari E D , Hidayanto E , Subanji  , Rahardi R
Published: June 2019

Mathematical representation is needed in conceptual understanding, solving mathematical problems, and communicating mathematical ideas by students. This research describes the form of Cerebral Palsy students’ mathematical representation which appear when solving a problem related to the concept of plane geometry. The emerging representation consists of four stages of mental construction namely action, process, object and scheme (APOS). Student work is influenced by physical and psychological conditions in which Cerebral Palsy has limitations in writing, speaking, or performing other acts in the learning process. The work result of the students studied, it appears that there are 3 types form of representation used, they are verbal representation, representation of mathematical expression, and visual representation. In verbal representations, there are complete mental constructs, namely actions, processes, objects and schemes. In the representation of mathematical expressions, and visual representations, mental construction only reaches the object stage. Stage action, the subject mentions what is known and asked from the question. Process stage, shows the ability of the subject to explain the way used in solving the plane geometry problem. Stage object, subject using verbal representation, visual as well as mathematical expression. The scheme stage, the subject associates the multiplication concept with the plane geometry area.
Development of Android Based Instructional Media of Algebraic Tiles for Quadratic Equation
Authors: Irianti O F , Qohar A
Published: June 2019

This research and development aims to develop the android based instructional media of algebraic tiles for quadratic equation. The media created must meet the criteria of valid, practical, and effective to assist the student in understanding the factoring in quadratic equations. The research model used in this research is 4D model developed by Thiagarajan. This model is used and modified into 3 stages only, those are (1) define stage; (2) design stage; and (3) development stage. The resulting product is named FICTION (Factorization of Quadratic Equation) which has apk as it’s extension and can be deployed and installed on a minimum android-based smartphone on version 4.0 / 4.1 (Ice Cream Sandwich). After trials, it can be conclude that FICTION is valid with level of validity 3.83, practical with level of practicality 3.1, but ineffective because none of students could pass the score minimum criteria.
Level of Students’ Creative Thinking in Solid Geometry
Authors: Utami S , Usodo B , Pramudya I
Published: June 2019

Creativity is an important aspect to face the global challenges. Creative thinking skill is a skill that is needed in this era to face problems in all aspects of modern life. Creative thinking is a thinking style which allows individuals to produce new products, find new solutions, and new ideas. The purpose of this study is to identify the level of students’ creative thinking in solid geometry. This research is a qualitative descriptive research. The subjects of this research were three students from 8th grade student of SMP N 8 Purwokerto Banyumas regency. The students were classified to high-ability, moderate-ability, and low-ability. The data were collected through creative thinking test and interview. There are three aspects of creative thinking: fluency, flexibility, and novelty. Based on the results, three subjects didn’t fulfill novelty, students who had low-ability had creative thinking level 0 (Not Creative), students who had moderate-ability had creative thinking level 1 (Almost Not Creative), and students who had high-ability had creative thinking level 2 (Quite Creative).
Preliminary Design of ILC-based Multimedia on Base of Number Concept
Authors: Witri G , Syahrilfuddin S , Guslinda G , Mahbubah K , Hermita N
Published: June 2019

Interactive Conceptual Learning (ILC) based Multimedia has been developed to represent base of number concept turn into more interactive and meaningful learning. The first design of ILC based multimedia is multimedia supported computer that explore base of number concept in existing conceptual. Pre-service elementary teachers should be provided with the learning that can optimize the base of number conceptions. To collect and analyse data comprehensively, researchers developed a 3D-1I developing method which has comprehensive stages: analysis, design, development, implementation and evaluation. The 3D-1I developing stage has been utilized to describe comprehensively ILC based Multimedia. It can be proved with the increasing average score from 30.10 on pretest to 82.33 on posttest of pre service teachers’ understanding on base number concept. Based on data analysis, it can be concluded that ILC-based multimedia could effectively improve pre-service teachers’ conceptual understanding on base of number concept.
Developing an Essay Test Instrument for Measuring Diagram Representation and the Capability of Argumentation on Newton’s Law
Authors: Syarif A N , Kuswanto H
Published: June 2019

The objective of this research was to develop an essay test instrument for measuring diagram representation and capability of argumentation of senior high school students. This research was conducted through three stages: (1) planning; (2) instrument experiment; and (3) manufacture. The instrument that would be administered was an essay test that consisted of 14 items for measuring diagram representation and capability of argumentation on the Newton’s law. This study implemented qualitative and quantitative validation analyses that have been provided by eight experts (lecturers, teachers, and peer reviewer) and an empirical validation using the Partial Credit Model (PCM) Item Response Theory (IRT) instrument with QUEST and PARSCALE application. The results of the quantitative validation were attained from Aiken’s V Index and showed this index of six items on the measurement of diagram representation is around 0.94-1.00. On the other hand, the results of the quantitative validation through Aiken’s V Index also showed that index of eight items on the measurement the capability of argumentation had is around 0.88-1.00. Then, the empirical validity test involved 250Grade XI students from SMAN 8 Bulukumba, South Celebes. Instrument analysis was conducted using PCM IRT on the basis of the QUEST application, and the results of this analysis showed that the INFIT Means-Square (INFIT MNSQ) was around 0.77 to 1.33 and the level of difficulty was around -0.824 to 0.797. The item reliability of each test item for the diagram representation and capability of argumentation was 0.79 and 0.85 respectively. In conclusion, the test instrument was in accordance with the students’ capability, ranging from -2.542 to 1.922, with a Standart Error Measurement SEM of 0.222, based on the PARSCALE outcome.
Physics Learning Using Direct Instruction Model Assisted by Plickers Application to Measure Problem Solving Ability
Authors: Naqiyah M , Jumadi  , Wilujeng I
Published: June 2019

This was a quantitative research that aims to know the effectiveness of physics learning by using direct instruction model assisted by Plickers application, knowing the problem solving ability of learners after being taught using direct instruction model assisted by Plickers application, and knowing the percentage of learners achievement for each problem solving indicators. The subjects of the study were the students of class XI MIA 1 SMA Negeri 1 Sayegan consisting of 32 students and selected using purposive method. Data was collected by using a test instrument in the form of a reasonable multiple choice which presented in the Plickers application. The results showed that learning by using direct instruction model assisted by application of Plickers was effectively used in physics learning process in terms of KKM (minimal completeness criteria) achievement. In addition, the average score of students’ problem solving ability was 85.00 with details of 27 students scored the high category and 5 students were in the medium category. Furthermore, the percentage of each problem solving indicator was in the high category and only one indicator experienced the medium category with a percentage of 73%.
Analysis of Items Using the Assessment Instrument Based on the Structure of Observed Learning Outcome
Authors: Nasrulloh A , Ashadi  , Yamtinah S
Published: June 2019

The purpose of this study was to analyze items that will be used in taxonomies based on the observed learning outcomes structure (SOLO) to categorize student responses so that items can be used in future studies. The research is descriptive research. Data were collected using a non-test method of a questionnaire consisting of 10 questions. Subjects in this study consisted of 3 lecturers and 5 teachers. The results showed that the items analyzed were grouped into SOLO taxonomy based assessment instruments with 14.2% unistructural, 29.6% multistructural, 29.6% relational and 29.6% abstracts expanded. The results also showed that the instrument the SOLO taxonomy-based assessment used included a very valid category with a score of more than 35. In conclusion, all of these items have met the category of SOLO-based taxonomy assessment instruments with very valid categories, so that it can further be used to measure students’ ability based on SOLO taxonomy on buffer.
The Profile of Students’ Scientific Inquiry Literacy Based on Scientific Inquiry Literacy Test (ScInqLiT)
Authors: Innatesari D K , Sajidan S , Sukarmin S
Published: June 2019

This study aimed to describe the profile of scientific inquiry literacy. This study used a descriptive method with engaging 205 students from three junior high schools in Kediri Regency. The sample selection used a purposive sampling technique. The used scientific inquiry literacy instrument referred to ScInqLiT (Scientific Inquiry Literacy Test) by Wenning [12]. The results showed that students’ achievements of scientific inquiry literacy were indicated in the indicators such as identifying and controlling variable (38,05%) with low category; recognizing and analyzing alternative explanations and models (42,93%) with enough category; drawing appropriate conclusions from evidence (60,98%) with enough category; understanding and analyzing data (48,62%) with enough category; constructing and interpreting graphs (38,70%) with low category; constructing hypotheses (39,15%) with low category; designing experimental procedures (61,63%) with high category; and identifying problems to be investigated (51,95%) with enough category. Thus, it can be concluded that students’ scientific inquiry literacy in Kediri was relatively low. Accordingly, for the further studies, they are recommended to enhance some indicators of students’ scientific inquiry literacy with applying appropriate learning methods and teaching materials.
Development of Practicum Instructions for Junior High School Students: Formalin Test Using Natural Indicators
Authors: Rahman N , Purwoko A A , Muntari  , Haifaturrahmah
Published: June 2019

The purpose of this study was to develop a formaldehyde test practicum instructions using natural indicators for the first high school students. This research method refers to the development procedure developed by Borg and Galls. The trial of 104 leaf and flower crown samples which were estimated to have potential as a natural indicator for formalin testing was carried out. Only 3 natural indicators can be used for drops and filter paper, namely flower: ribosa ruellia, hibiscus rosa-sinensis L and balsamina Impatiens L purpel. Based on the results of the expert assessment and the teacher showed that the practicum instructions were suitable for use by junior high school students to test formalin.
Physiologic Glycated-Bovine Serum Albumin Determination using Spectrum-UV
Authors: Khoirunnisa W , Nur M I , Widyarti S , Permana S , Sumitro S B
Published: June 2019

Albumin is not native phase, but it physiologically-binding with another compound which conclude the functions as transporter and scavenger. The general non-enzymatic reaction within proteins, which has a significant impact on their physical and functional properties by reducing sugar, known as glycation. The study investigated the effective composition to glycate the bovine serum albumin (BSA) by UV-spectrum. Five BSA concentrations (750, 500, 100, 10 and 1 mM) was prepared in PBS pH 7.4. The glycation carried out using glucose concentrations (2M, 1.5 M, 1 M, 500 mM, and 100 mM) before and after incubation for seven days. Depending on concentration, BSA 1 mM and 10 mM showed the best UV spectrum of protein that two peaks, 220 and 280 nm. Hence, the glycation by high concentration of glucose would be made a conformational change of BSA which is marked by the UV-spectrum of BSA configuration. Glucose 100 and 500 mM was effective to glycate BSA.
Bioethanol from Sargassum sp Using Acid Hydrolysis and Fermentation Method Using Microbial Association
Authors: Kusuma Wardani Anggraeni , Herrani Retno
Published: June 2019

Sargassumsp is one of the abundant seaweed in Indonesian seas and it has the potential to be used as a renewable alternative energy source. DrySargassumsp contains 58.23% carbohydrate that can be used as bioethanol through a fermentation process. This research aims to determine the effect of fermentation time on the amount of ethanol content produced fromSargassumsp fermentation.The type of this study was laboratory experiment. The experiment was conducted by using microbial association namelyZymomonas mobilis,Tape Yeast and Bread Yeast with variation of fermentation duration of 4 days, 5 days, 6 days, and 7 days. Glucose test is done by using the DNS method. The measurement of ethanol content is done by using Gas Chromatography. In the data analysis the researcher uses correlation regression statistic method. The result of the research shows that the best treatment was 6 days fermentation duration with the amount of ethanol 24.67% with the reducing sugar content 54,570 ppm. The longer the fermentation time the higher the ethanol content produced except on the 7th day showing decline. The results of data analysis showed that the difference in fermentation time to ethanol content produced had a correlation coefficient that was positive and there was no significant relationship.
The effect of molase and urea on the production of alkaline protease from indigenous Aspergillus flavus DUCC K225
Authors: Rukmi I , Mulyani N S , Pujiyanto S
Published: June 2019

Protease is one of industrial important enzyme which can be produced by microorganisms. including fungi. Alkaline protease had physiological and commercially important. this enzyme used in detergent industries as additives. The indigenous mold Aspergillus flavus DUCC K225 isolated from lime soil of Madura island demonstrate the ability in producing extracellular protease at pH 8. The aim of this study was to examined the production of alkaline protease from A. flavus K225 on Czapeks Dox modified liquid medium containing molase as C-source and urea as N-source. The study were done in submerged culture on rotary shaker. The production of alkaline protease were observed after 7 days incubation. by examined fungal biomass. protease activity. protein content and protease specific activity. The examination of enzyme activity conducted at pH 8.5 done on crude enzyme and ammonium phosphate fractions of 0-20%. 20-40%. 40-60%. 60-80% and 80-100%. The results showed that the fungal biomass gained was 14.27 g/L. while the highest protease specific activity found at 40-60% ammonium sulphate fractination (71.75 U/ml) and 4.2 purification fold.
Development of immunohistochemical triple staining method for the evaluation of different types of cell death in coronary thrombus
Authors: Pertiwi K R , de Boer O J , Gabriels P , Mackaaij C , van der Wal A
Published: June 2019

Immunohistochemistry is a powerful technique to identify the presence, distribution and extent of certain antigens at protein level in tissue specimen. Multiple immunostainings enable the detection, colocalization and comparison of several markers within one specimen. However, an optimization study is firstly needed to ensure the expression of multiple markers is clear and distinguishable. We formulated an optimized sequential triple immunostaining protocol which could identify the simultaneous presence of three types of cell death namely necrosis, apoptosis and etosis. These following antibodies were used: C-reactive protein (CRP, necrosis), (cleaved) Caspase-3 (Casp3, apoptosis) and citrullinated-Histone3 (CitH3, etosis). Several antigen retrieval methods, various concentration and order combinations of those antibodies as well as different combination color of chromogens were tested on coronary thrombus materials obtained from patients with acute myocardial infarction (AMI). The results showed that CRP (1:4000) visualized with 3,3’-diaminobenzidine (DAB) in brown, is better performed as the first staining, followed by CitH3 (1:8000) visualized with Perma Blue as the second staining and Casp3 (1:500) visualized with Perma Red as the last staining. In conclusion, we presented an immunohistochemical triple staining protocol to identify the comparative presence of different types of cell deaths: necrosis, apoptosis and etosis in coronary thrombus specimens.
Effect of Fermentation to Total Titrable Acids, Flavonoid and Antioxidant Activity of Butterfly Pea Kombucha
Authors: Christiani Dwiputri Maria , Lauda Feroniasanti Y.M.
Published: June 2019

Butterfly Pea (Clitoria ternatea L.) has been utilized as traditional medicine to cure many kind of diseases. Previous study indicated that Butterfly Pea contains bioactive compounds that can be used as antioxidant, such as flavonoid. Butterfly Pea can be used as alternative substance for kombucha. This research aims to study about the effect of fermentation length towards total titrable acids content, total flavonoid content and antioxidant activity of butterfly pea kombucha. This research was conducted from March until May 2018 at the Laboratory of Biology and Pharmacy Department, Sanata Dharma University. This research used Completely Randomized Design (CRD) with the treatment of six different fermentation length, which was 0 day, 4 days, 8 days, 12 days, 16 days and 20 days. Each data obtained from this research were analyzed using correlation and regression statistic test. The results of the test showed that the treatment of fermentation length gave significant and positive correlation towards total titrable acids content and total flavonoid content. It means that the longer of fermentation length leads to higher of total titrable acids content and total flavonoid content. Whereas, the statistic test of antioxidant activity data showed that there was no significant correlation between the treatment of fermentation length to the levels of antioxidant activity of Butterfly Pea kombucha.
Use of Mung Bean Sprout (Tauge) as Alternative Fungal Growth Medium
Authors: Ilmi M , Putri L K , Muhamad A A K , Cholishoh A , Ardiansyah S A
Published: June 2019

Growth media are essential in mycological studies. Currently, laboratories are using ready-to-use media which are commercially available. However, the prices of such media are high and are a burden on low-funded laboratories. Mung bean sprout (tauge) has been used as a cheap alternative growth medium since 1974, but study comparing performance of the medium with its commercial counterparts has not been reported. This study was done to compare the performances of tauge extract with commercial Potato Extract and Yeast Extract for growing yeast and filamentous fungi. We also endeavoured to optimise the composition of the alternative media by statistical analysis. The results show that the tauge extract medium gave a significantly higher growth rate of Saccharomyces cerevisiae and a significantly lower growth rate of Kluyveromyces marxianus compared to the commercial media. On the other hand, the growth rates of Aspergillus oryzae and Trichoderma viride on all media are not significantly different. The optimum composition of tauge extract media for S. cerevisiae are 9.6 and 6.8 % (w/v) of tauge and sugar, respectively. For A. oryzae, maximum growth is predicted when the medium contains 11.2 and 7.4 % (w/v) of tauge and sugar, respectively.
Developing enrichment module of polyploidy on shallot (Allium ascalonicum L.) for 12th grade students
Authors: Khikmah F F , Suratsih
Published: June 2019

The objectives of this research were to determine the effect immersion duration and concentration of colchicine on polyploidy of shallots (Allium ascalonicum L.), to develop enrichment module based on the study, and to assess the enrichment module feasibility based on assessment of material experts, media experts, biology teachers, and responses of students. The research was development research using ADDIE model limited to development stage. Data of the study was the description of chromosome counting. The module feasibility data was obtained from the assessment by the reviewers and the responses of the respondents. The module feasibility assessment data was processed into quantitative data. The aspects analysed include the assessment of appropriateness of the concept, feasibility of content, presentation, language, and graphic. The results showed that colchicine’s immersion duration and concentrations had effects on polyploidy of shallots. The results of the research were used to develop module of mutation learning based on 2013 curriculum. Module review from material experts showed that most of the module’s substances were appropriate. Module review from media experts and responses of students showed that the module was feasible, and from biology teachers was highly feasible. The overall assessment results showed that polyploidy module was eligible feasible as teaching material in enrichment program for 12th grade students.
Teacher’s Perception Towards Implementation of Service Learning Model during Teaching and Learning of Biology in Senior High Schools in Yogyakarta District
Authors: Ajeng Antasari Galuh , Subali Bambang
Published: June 2019

This study aimed to determine the teacher’s perception towards implementation of service learning model during teaching and learning of Biology in senior high schools based on the; the status of school, i.e. state Senior High School and private Senior High School. This study used survey method to collect data from a sample population of 46 Biology teachers in 24 senior high schools in Yogyakarta district, Yogyakarta special region province, Indonesia. Amongst these schools, 11 state schools and 13 private schools based on ownership status. Data collection techniques used was questionnaires and data analysis was done by using descriptive statistical analysis. The study results showed that 32 % teachers from state was searching information about service learning and understand it. However just 9.09 % that implement it in biology learning. 37.5 % teacher from privately owned schools was searching information about service learning and understand it and 12.5 % apply it ini biology learning. Both had a positive perception towards the implemention of service learning model on certain learning materials like disorders and diseases that attack the human body system.
The Teachers’ Experiences in Implementation of Project Based Learning during Teaching and Learning of Biology in Senior High Schools in Yogyakarta District
Authors: Baptist K J , Subali B
Published: June 2019

This study aimed to; (1) find out how often teachers use PjBL during the teaching and learning process of biology, (2) assess the teachers experiences during guiding students on aspects involved in project designing, project implementation, and presenting the project results, and (3) find out how often the students were guided by their teachers on the aspects of project designing, project implementation, and presenting the project result. The research used the qualitative methodology to study 21 biology teachers and 250 teachers from tenth and eleventh grade of 10 state senior high schools in Yogyakarta district between March and May of the academic year 2018 / 2019. The data obtained from teachers’ and students’ questionnaires were analyzed using SPSS version 23. The results showed that; (1) most biology teachers (71.4%) frequently use PjBL, (2) majority of the teachers, (59.4%) project designing, (76.9%) project implementation, and (56.4%) presenting of project results felt it relatively easy to guide students on the aspects of PjBL and (3) most students (67.6%) are often guided by their teachers on aspects involved in the project designing, project implementation, and presenting of project results.
Students’ Scientific Argumentation Skills Based on Differences in Academic Ability
Authors: Ika Noviyanti Nurul , Rosyadah Mukti Windy , Dahlia Yuliskurniawati Irma , Mahanal Susriyati , Zubaidah Siti
Published: June 2019

One of the skills students must possess in the 21st-century biology learning is scientific argumentation skills. Scientific argumentation skills are associated with a strong understanding of concepts and improved critical thinking skills and scientific literacy. The purpose of this study was to investigate the scientific argumentation skills of high school students with different academic abilities. The current study was designed as a survey which involved tenth graders from two public senior schools, SMAN 3 Malang and SMAN 7 Malang. The first served as the representative of students with high academic ability and the latter was appointed to represent the low achievers. The data were analyzed using an independent-samples t-test. The results showed that there were significant differences between the high and ability students’ scientific argumentation skills with a p-value of 0.003. Around 10.34% of the high achievers could perform level 1 argumentation skills, 74.41% of them were able to achieve level 2, and 17.24% of the students reported level 3 responses. Among the students with low academic ability, 12% had reached level 1 argumentation skills and 88% of them were only able to achieve level 2, indicating that no one (0%) could answer the test with level 3 responses. This condition suggests that it is important to implement an innovative learning.