bluuebunny/crossref_metadata_2025 huggingface dataset:
Nonlinear four-wave mixing with enhanced diversity and selectivity via spin and orbital angular momentum conservation
Authors: Liu X. , Christensen E. N. , Rottwitt K. , Ramachandran S.
Published: January 2020

Light that can carry orbital angular momentum (OAM) has found a variety of applications in super-resolution microscopy, optical communications, and laser machining, bringing up the need for pure OAM light generation at on-demand power levels and wavelengths. Parametric four-wave mixing is a promising platform for such source generation, and while investigations of higher-order fiber modes have revealed enhanced phase-matching possibilities, the role of the angular momentum of light in this process has not yet been substantially considered. Here, with a specially designed ring-core fiber in which over 16 OAM modes can be stably guided, we demonstrate the first experiments, to our knowledge, investigating nonlinear four wave mixing between OAM modes in an optical fiber. The large modal space as well as spin and OAM conservation rules enable a high diversity of phase matching conditions while also providing high selectivity. We report parametric wavelength translations of over 438 nm and the ability to obtain kilowatt peak-power level ∼ nanosecond pulses of pure OAM beams at user defined colors.
Voltage-controlled magnetic anisotropy in an ultrathin Ir-doped Fe layer with
a CoFe termination layer
Authors: Nozaki Takayuki , Endo Masaki , Tsujikawa Masahito , Yamamoto Tatsuya , Nozaki Tomohiro , Konoto Makoto , Ohmori Hiroyuki , Higo Yutaka , Kubota Hitoshi , Fukushima Akio , Hosomi Masanori , Shirai Masafumi , Suzuki Yoshishige , Yuasa Shinji
Published: January 2020

We investigated the voltage-controlled magnetic anisotropy (VCMA) in an ultrathin Ir-doped Fe layer with a CoxFe1−x termination layer. The VCMA effect depends on the concentration of the CoxFe1−x alloy, and a large VCMA coefficient, as high as −350 fJ/Vm, was obtained with a Co-rich termination layer. First principles calculations revealed that the increased VCMA effect is due not only to the added Co atoms but also to the Fe and Ir atoms adjacent to the Co atoms. Interface engineering using CoFe termination is also effective for recovering the tunneling magnetoresistance while maintaining a high VCMA effect. The developed structure is applicable for voltage-controlled magnetoresistive devices.
Fabrication and characterization of reduced graphene oxide by atmospheric pressure plasma jet
Authors: Zhao Ying , Chen Longwei , Meng Yuedong
Published: January 2020

A low-cost and fast reduction method for the fabrication of reduced graphene oxide (r-GO) by using a dielectric barrier discharge plasma jet under atmospheric pressure has been presented. Highly reduced r-GO with the carbon atomic ratio up to 87.43% is obtained in minutes. By using diagnostic instruments like XRD, Raman, scanning electron microscopy, transmission electron microscopy, FT-IR, and X-ray photoelectron spectroscopy, the morphology, chemical, and structural properties of r-GO are analyzed. Due to the relatively high bonding energy, the functional group of C—O—C is the dominant structure in r-GO. By using N2 adsorption-desorption measurements, the specific surface area is calculated to be about 145 m2 g−1. The porosity results indicate that r-GO is a mesoporous structure with the pore size ranging from 3 nm to 4 nm.
A cognitive framework for understanding genre
Authors: Vergaro Carla
Published: January 2020

The purpose of this paper is to apply theEntrenchment-and-Conventionalization Model(EC-Model hereafter; seeSchmid 2014,2015,2016,2017,2018;Schmid & Mantlik 2015) of language knowledge to genre, with the aim of showing how a unified theory of the relation between usage and linguistic knowledge and convention can shed light on the way genre knowledge becomes entrenched in the individual and shared conventional behavior in communities. The EC-Model is a usage-based and emergentist model of language knowledge and convention rooted in cognitive linguistics and usage-based approaches. It sees knowledge as emerging from language usage, and explains the processes underlying the intertwining of social practice and cognition. However, so far, no suggestion has been advanced on how to extend the model to account for entrenchment and conventionalization at the supra-sentential level. In the area of genre studies various attempts have been made by scholars to develop or apply theories belonging to different scientific domains to understand the nature of genre. However, so far, there has been no research that applies a unified model in the attempt to link entrenchment of genres in individuals to their conventionalization at the societal level. I largely focus on the long tradition of rhetorical studies of genre, one among the different approaches that, over time, have regarded genre as their main topic of investigation. I concentrate on this tradition as it opens up the entire field of enquiry that defines contemporary genre research. To these I add by showing how the explanations provided so far can be cognitively clarified and unified under the EC-Model. The paper, then, argues that the EC-Model is theoretically apt to address questions about the nature of genre, capturing in an elegant way the interplay between cognition and social interaction in genre emergence, evolution, stabilization and variation.
In situ synthesis of TiC/Ti coatings by reactive plasma spraying
Authors: Sun Xuan , Li Wei , Huang Jihua , Yang Jian , Chen Shuhai , Zhao Xingke
Published: January 2020

Sucrose, as a precursor of carbon, and titanium powders were used to prepare TiC powders by a spray-drying/precursor-pyrolysis method. Using the powders, TiC/Ti composite coatings were deposited by reactive plasma spraying. The results show that submicron-sized TiC is formed. The TiC phases have three kinds of crystal morphology: spherical TiC with a diameter of about 600 nm, dendrite TiC with a primary dendrite spacing of about 450 nm and a secondary arm spacing of about 150 nm, and cellular-dendrite TiC with a width of about 120 nm and a length of about 600 nm. The TiC/Ti coatings exhibit high microhardness and excellent wear resistance, which is about 2–3 times and about 200 times higher than that of TC4 alloys, respectively.
Massive MIMO Detection Algorithms Based on MMSE-SIC, ZF-MIC, Neumann Series Expansion, Gauss-Seidel, and Jacobi Method
Authors: Wang Zixuan
Published: January 2020

The massive multiple-input multiple-output (MIMO) systems is an important technology in the fifth generation of mobile communication. To get the result of a MIMO system require some algorithm to approximate the precise result as the computation complexity is too large. There are several methods that have been advanced in the fitting, like zero forcing (ZF) method or minimum mean-square error (MMSE) method. However, in massive MIMO system, these methods require further simplify because of the increasing complexity of matrix inversion. In the papers, many methods were presented to get the approximation matrix: like MMSE-SIC, ZF-MIC, Gauss-Seidel, Jacobi and Neumann series expansion. The Jacobi’s iterative method and Newton’s iterative method both use iteration to approach the MMSE estimation. Their BER performance can outperform current methods and require less computational complexity. Almost every method can get a nearly ideal fit when the number of users or antennas is large enough. But when the number is small, the approximation will not be very accurate.
New Secret Key Agreement Scheme over Relay Communication Channel
Authors: Xing Li-Juan , Pan Feng , Jiang Xue-Qin , Peng Kaizhi , Wen Miaowen
Published: January 2020

The novel advantage distillation (AD) scheme for secret key agreement (SKA) scheme over relay communication system for the wiretap channel model is proposed. For the case where there are noiseless both the main channel and the eavesdropper’s channel, the SKA scheme for the noiseless relay communication (SKA-NRC) system is proposed. In this scheme, random sequences
qA

and
qB

are used as artificial interference to prevent eavesdropping. Simulation results show that with the proposed SKA schemes, the bit error ratio (BER) of eavesdropper Eve maintains stably at 0.5, while legitimate users Alice and Bob are able to get much lower BERs.
Image Encryption Using Fractional Order Linear-Nonlinear Chaos
Authors: Feng Gao
Published: January 2020

A fractional order chaos system is first designed. It is a linear-nonlinear hybrid using fractional order logistic map. The fractional order chaos system is closer to the real nature phenomena and has better cryptography features than the integer order chaotic systems in dynamics, such as larger range of key space and almost no periodic windows in bifurcation diagrams. Then, we propose an image encryption scheme employing the superior chaotic features of the fractional order chaos system. Which chaotic sequences generated are used for permutation and addition/subtraction operation of encryption depends on the plaintext image. Security analysis and test results indicate that our encryption scheme has a high efficiency and superior security.
Optimization of Lucy-Richardson Algorithm Using Modified Tikhonov Regularization for Image Deblurring
Authors: Khetkeeree Suphongsa
Published: January 2020

In this paper, we propose the method to optimize the iteration number of the Lucy-Richardson algorithm for image deblurring. This technique based on the modified Tikhonov regularization which composed of 2 parts which are designed for measuring the image similarity and noise enhancement due to the deblurring process. The regularization parameter will be used to control the desired deblurred image. Several sizes of the Gaussian blur kernel are applied for generating the degraded image in the simulation experiment. The Peak Signal to Noise Ratio (PSNR) metric is used to measure the deblurring performance. The results show that this method can be used to estimate the optimal iteration number and it also gives the PSNR value higher than the default Lucy-Richardson method and regularized filter all sizes of the experimental blur kernel. Moreover, it also tolerance to the deviated blur kernel especially it smaller than exact blur kernel.
Research on Course Planning for Multi-AEW Cooperative Detection based on Real-time Detection Area
Authors: Wanyong Cai , Liangfa Hua , Pei Zhu , Saiqiang Xia , Zhengxin Liu
Published: January 2020

This paper presents a concept of stable coverage degree and its quantitative formula, and two kind of cooperative detection modes was put forward, which was defined as Mode A and Mode B. On the basis of estimation models including the model for real-time detection area, the model for cross coverage area, and the model for course planning, the decision-making model for multi-AEW optimal deployment was given. Finally, the contrastive analysis on two models was provided by simulation computing, its results showed the Mode B surpass Mode A, and various internal and external factors were considered into estimation models, which can offers the applied basis for multi-AEW course planning.
The Machine Learning Solution based on Period and Deep Construction of Mobile Data for Predicting User Habit
Authors: Du Juan
Published: January 2020

Information analysis on user habit is becoming hotter as its value for many potential and profitable areas. However, how to excavate hard-core data and obtain the most effective information associated with research target, and how to obtain more precise prediction of user habit timely and fast on mobile terminals, are still big challenges. Most of the traditional methods use static data, which can no longer meet the requirements of the movable era, such as learning daily travel route and predicting the next most possible applications. Additionally, though algorithms based on Artificial Intelligence (AI) have boomed, many researches only based on direct data and pay insufficient attention to the deeper interrelation of data. This paper introduces two relevant AI models improving the phone memories; then, the main solution is recommended in detail. It mines some closely correlated parameters by specific mechanism named Linked Trigger (LT) and filtering policies for positioning, digging their underlying relations for better learning user habit by special construction ‘Directed Location Pair Application (DLPA)’. Based theseanalysis on the deep-seated connection between the collected data, the conditional probability referring Bayesian network is used to learn and predict the location habit and application habit.
Maximum Entropy Method without False Peaks with Exact Numerical Equation
Authors: Ishiyama Fumihiko
Published: January 2020

The standard numerical maximum entropy method (MEM) still uses the Yule-Walker equation which contains rough approximation by Walker. The commonly used numerical equation contains additional modifications to reduce calculation cost. Nowadays, we have powerful computers and there is no reason to use the modified equation. We show that the drawbacks of MEM such as false peaks and peak splittings are from the modifications. They do not appear when using the exact numerical equation, even a given time series is fractional.
Application of guided inquiry learning model based on inter-intrapersonal intelligence in chemistry classroom
Authors: Amrina H U , Sutrisno H
Published: January 2020

This study aims to determine the differences in the inter-intrapersonal intelligence of students who are taught with guided inquiry learning models based on inter-intrapersonal intelligence with students who are taught with direct instruction models on electrolyte and non-electrolyte solution materials. This research is a quasi-experimental study using a post-test only research design. This study used one experimental group and one control group. Students in the experimental group (N = 34) was taught using the guided inquiry learning model based on inter-intrapersonal intelligence in learning activities, while the control group (N = 34) was taught using the direct instruction model. The instrument used in this study is an inter-intrapersonal intelligence questionnaire. The data analysis technique of the research results used in this study is the independent t-test technique with a significance level of 0.05 and was found 0.038. The mean scores of inter-intrapersonal intelligence questionnaire in the experimental class was 62.35 while in the control class was 58.96. This means that there is a significant difference in inter-intrapersonal intelligence between students taught in learning with guided inquiry learning models based on inter-intrapersonal intelligence and students who take learning using direct instruction learning models on electrolyte and non-electrolyte solution materials.
An analysis of representation level and cognitive level in curriculum-2013 chemistry textbook
Authors: Setyowati P A , Sutrisno H
Published: January 2020

This paper aims to describe 10th-grade chemical textbook, representation level from the materials and tasks in chemical bonding chapter, cognitive level based on Bloom’s taxonomy in chemical bonding chapter, and use of representation level in questions and textbook. Some problems arise related to the achievement of the curriculum from the implementation of the use of textbooks. Textbooks can be used as students’ reference in finding knowledge. Data collection was conducted by analyzing three 2013 Curriculum chemistry textbooks related to the suitability of textbooks, the representation level, and cognitive tasks of chemical bonding materials. Suitability of textbooks identified by three of Indonesia’s Regulation of the Ministry of Education and Culture. The representation level was identified by chemical bonding chapter from the textbook. The problems were identified based on the cognitive level and the representation level. The results show that three chemistry textbooks consisted of the display, content, activity load, curriculum basic framework, level of education, and material scope. The materials and tasks include macroscopic, sub-microscopic, symbolic, and mathematics. The cognitive level based on Bloom’s taxonomy is at the level of remembering, understanding, applying, and analyzing. The representation level used is assisted by technology for images, videos, and slides.
The development of acid-base e-chemistry magazine as interactive teaching materials
Authors: Tarawi O , Noer A M , Linda R
Published: January 2020

E-Chemistry Magazine that has been developed is a teaching materials that utilizes the development of technology to improve the quality of a learning process. The objective of this research is to develop an interactive e-chemistry magazine for the acid-base course unit. The method used in this research is the Plomp model research and development (R&D) design. This research consists of three phases, (a) preliminary research phase, (b) prototype or development phase, and (c) assessment phase. The result of this research indicates that acid and base e-chemistry magazine is considered to be strongly valid by the content and media experts. The responses from teachers and students regarding the acid and base e-chemistry magazine are very good and very interesting. This suggests that the production of acid and base e-chemistry magazine meets the decent criteria to be used as interactive teaching materials in the learning of chemistry for the acid-base course unit.
Improving problem-solving ability in physics through android-based mobile learning application
Authors: Gebze D A , Jumadi  , Perwati S
Published: January 2020

The purpose of this study is to know the improvement of problem-solving ability in physics material (light reflection on concave and convex mirrors) before and after being taught by using Android-based learning media. The subjects of this study were the students of class XI MIPA 2 at MAN 2 Yogyakarta which consisted of 27 students. The design of this study is one group pretest-posttest and includes a Pre-Experiment study. Data collection techniques using problem-solving tests and technical data analysis using inferential and descriptive analysis. The inferential analysis shows that pretest and posttest come from homogeneous and normally distributed populations. The results of the study obtained that the improvement of students’ problem-solving abilities is in the category of low and medium N-gain.
The development of android-based physics comic on optical devices for high school students
Authors: Maghfiroh A , Kuswanto H , Susetyo B
Published: January 2020

This research aims to (1) produce an android-based physics comic learning media on optical devices about eye and camera (2) examine the value of feasibility of android-based physics comic learning media on optical devices about eye and camera. This research uses ADDIE model. The model consists of five steps; (1) Analysis, this stage aims to analysis the problem, (2) Design start to design product that will be developed according to the results of the needs in learning analysis, (3) Development, the process of creating and developing product according to design, (4) Implementation, the stage to use the developed product (5) Evaluation, to improve the product based on criticism and suggestions from the questionnaire responses done by respondents after using the developed product. Validity of the instrument is counted by the percentage agreement through the validation eye and camera of media expert, material expert, and questionnaire responses of respondents. The results of these research and development are (1) produce an android-based physics comic learning media on optical devices about eye and camera (2) the developed media own a high score of feasibility with a very good predicate. This shows that the developed learning media is feasible to use in learning.
Interactive conceptual instruction model assisted by PhET simulations on the improvement of physics multiple representations
Authors: Vegisari  , Wilujeng I , Hardiyanti S
Published: January 2020

This study aims to determine the effect of Interactive Conceptual Instruction (ICI) models aided by PhET Simulations on improving the ability of multiple representations of student’s physics. The research method used was Pre-Experimental Design with One Group Pretest-Posttest design. Fifteen multiple-choice assessment instruments in the pre-test and post-test were given to 31 students of class 10th in SMA Negeri 1 Banguntapan. The results of the analysis state that there is an influence of interactive conceptual instruction models aided by PhET Simulations on improving the ability of multiple representations of student’s physics. The improvement is shown by the Wilcoxon Sign Rank Test results. The results show that the significant value is smaller than the significant level (α), which is 0.000 <0.05. The mean value of the post-test is higher than the mean value of the pre-test shown in the descriptive analysis, and there is a shift in the range of values from 46-80 to 66-91. This research shows that interactive conceptual instruction models assisted by PhET Simulations can improve the ability of multiple representations of students physics.
The use of android-assisted comics to enhance students’ critical thinking skill
Authors: Damayanti A E , Kuswanto H
Published: January 2020

This study aims to determine improvements in students’ critical thinking skills through android-based physics comics. This type of research is quantitative research using a one-group pretest-posttest design with a pre-experimental approach. The research sample was determined by purposive sampling as many as 44 students. This research was conducted in two classes experiments: experiment A and experiment B. The media used is an android-based comic about impulse-momentum material. Critical thinking skills of students analyzed by the results of the pretest and posttest. The results of the two classes tested showed an increase in posttest scores. N-gain for the experiment A and the experiment B shows the increase in the value of the pretest and posttest is in the medium category. Thus it was concluded that the Android-based physics comic that was developed could improve students’ critical thinking skills.
Application of STEM learning approach through simple technology to increase data literacy
Authors: Rahmawati L. , Wilujeng I. , Satriana A.
Published: January 2020

This study aims to investigate the STEM approach’s effect on data literacy through simple technology on the theory of spring vibration. The research method used a quasi-experimental design with one group pretest posttest design. The study was conducted in class X MIA 2 MAN 1 Yogyakarta with 26 students. Data collection used pretest and posttest scores as measurement of data literacy. Based on data analysis results, this study obtained an enhancement in data literacy abilities. It can be seen in the N-gain test result. The results showed that 54% of students had data literacy in the high category, 42% in the medium category, and 4% in a low category. This study shows that there is an increase in student data literacy abilities after they are learning with the STEM approach through simple technology.
Development of e-handout assisted by PhET simulation with problem based learning (PBL) model about momentum conservation law and collision to train students’ conceptual understanding
Authors: Rahmawati E N , Jumadi  , Astuti D P
Published: January 2020

The research produce an e-handout assisted by PhET simulation with problem based learning (PBL) model about momentum conservation law and collision to train students’ conceptual understanding. The e-handout was developed which use to train the conceptual understanding of students, which was previously conducted a feasibility test on e-handouts. The research uses the ADDIE development model. The subjects of the research were students of SMA N 1 Sleman class X MIA. The instrument used in data collection in the form of validation sheets by experts, students’ questionnaire responses, and conceptual understanding test instrument. The data obtained and it analyzed quantitatively. The result showed that e-handout development was carried out in accordance with product development procedures, validation of expert show that e-handouts have very high criteria, the results of the questionnaire responses of students showed that the e-handout was appropriate to be used as a medium for learning physics with a good category, the result of understanding the concept have improved significantly. Based on the result above, the research shows that the development of e-handouts is feasible to be used as teaching material and it is known that students’ understanding of concepts in learning physics can be improved.
STEM application through simple technology to improve technology literacy
Authors: Utami V B , Wilujeng I
Published: January 2020

This study aims to examine the effect of applying the STEM (Science, Technology, Engineering and Mathematics) approach through simple technology on the technology literacy of students in a simple harmonic motion content. This research method is one group pretest-postest design. There are two classes involved, namely the modeling and implementation class. Both classes use the STEM approach through simple technology. The research subjects were grade X students at MAN 1 Yogyakarta. The research sample consisted of 26 students in the STEM modeling class and 24 students in the STEM implementation class, which were determined by random sampling. The research instrument used a technology literacy description test. Data were analyzed quantitatively using the SPSS 21.0 program. The analysis shows that there is an increase in the results of the pretest-posttest technology literacy ability of students in both classes. Technology literacy of students in both classes shows the same N-Gain which is 0.46 (in the moderate category). These results indicate that the STEM approach through simple technology on simple harmonic motion content can influence students’ technology literacy enhancement.
Using four-tier diagnostic test instruments to detect physics teacher candidates’ misconceptions: Case of mechanical wave concepts
Authors: Tumanggor A M R , Supahar  , Kuswanto H , Ringo E S
Published: January 2020

This research purposes to detect misconceptions of physics teacher candidates in Yogyakarta on the topic of mechanical waves. This research uses descriptive analysis method. The sample consisted of 35 physics education students in Yogyakarta. Data collection used a four-tier diagnostic instrument (4WADI) developed by Caleon and Subramaniam. The descriptive analysis findings from this research stated the results of a four-tier diagnostic analysis test classifying students in five categories, including scientific conception, lack of knowledge, false positive, false negative and misconception. Based on the results, the percentage of physics education students’ misconceptions in Yogyakarta varies on each problem indicator. The biggest misconception occurred in general characteristics of waves and wave motion represented in the graph by 32.4% and by 30.0% misconceptions on the topics of wave frequency, waves source, and medium properties. In addition, student misconceptions on each sub-topic of mechanical waves are highly categorized and need specific attention to carry out remediation. This finding might be used as a reference for lecturers or teachers to consider sub-topics of mechanical waves that have a high potential for misconceptions. Therefore, lecturers and teachers can apply efficient and effective learning methods and strategies to eliminate students’ misconceptions.
Scientific literacy profile of X grade students in Gunungkidul on Biology reviewed based on gender
Authors: Nugraheni N C , Paidi
Published: January 2020

This study aims to determine the ability of scientific literacy of students in biology subjects that are reviewed by gender. This research is a descriptive study with survey method to find out the difference in scientific literacy scores of male and female students. The population in this study were all X grade students in Senior High School in Gunungkidul Regency. The research sample used was 351 students from six schools taken by cluster random sampling with a total sample of 229 female students and 122 students of male students. The scientific literacy test instrument was prepared based on the 2015 PISA indicators by only taking biological content. The research data were analyse with Test of U Mann Whitney which had previously been subjected to a prerequisite test. The results showed that the average score of scientific literacy ability of female students was higher with a value of 59.45 compared to the average score of male students with a value of 55.33. Based on the results of the Test of U Mann Whitney showed a significance value of 0.16 which can be concluded that there is a significant difference between the average scientific literacy scores of female students with male.
Effectivity of Guided Discovery Learning with Concept Mapping to improve conceptual understanding in endocrine system material for grade XI science class
Authors: Sari R Y , Cahyo H N
Published: January 2020

This research aims to examine the effectivity of Guided Discovery Learning with Concept Mapping of endocrine system material. It is a quasi-experimental study with cluster sampling design. The hypothetical population is all students of SMA Negeri 2 Ngaglik, Sleman. The research sample is 67 students of grade XI science class which is divided into two groups; 33 students as the experimental group (Guided Discovery Learning with Concept Mapping) and 34 students as the control group (using 5M strategy). The data for students’ conceptual understanding on endocrine system material was collected using multiple choice test. The result shows that the Guided Discovery Learning with Concept Mapping improves conceptual understanding of student with higher average score (83.03) than control class (72.59) on endocrine system material especially for grade XI Science with sig. 0.000 (sig.<0.005). The data analysis showed that Guided Discovery Learning with Concept Mapping is effective to improve students’ conceptual understanding on endocrine system material.
Profile analysis of data literacy capability based on NGSS junior high school students in Takalar, South Sulawesi
Authors: Rahmita  , Rosana D
Published: January 2020

This study aims to identify the data literacy ability of junior high school students associated with NGSS learning standards. This study uses a qualitative descriptive study to analyze the results of the test of students’ data literacy abilities in several junior high schools. The method used is a test with a sample determined by purposive sampling technique. The subjects of the study sample consisted of 74 junior high school students in class VIII 2019/2020. The research instrument is in the form of 10 essay data literacy questions. The results of the analysis of the ability of data literacy with the highest percentage of 34.93% in the indicators of decision making and the lowest percentage were in the indicators evaluating decisions of 22.83%. For the percentage of the dimensions of the NGSS, it showed a result of 24.31% in the indicators of analyzing and interpreting data and the dimension of cause and effect obtained 34.42%. The results of this study indicate that the ability of literacy based on NGSS grade VIII students in Junior High School Takalar Regency is in the low category. Thus, the data literacy ability of students in learning science needs to be developed.
Analysis of the need for science teaching materials based on environmental problems on the island of Bangka
Authors: Adawiyah R , Ichsan A F R A , Nurcahyo H
Published: January 2020

This study aims to determine the need for teaching materials for natural science modules based on environmental problems due to tin mining on Bangka Island. This research uses a descriptive method. The instrument used in the form of a closed questionnaire and some questions use open questionnaire filled by 10 science teachers who teach in schools close to tin mining activities on Bangka Island. The instrument consists of 3 aspects with 11 indicators. The results of the analysis of the questionnaire found an average of the aspects of learning model aspects was 90%, the module’s teaching material aspects was 76%, the need for a problem-based IPA module due to a tin mine on Bangka Island aspects was 70%. Then based on these analysis of each of these aspect and indicators it can be concluded that needed teaching materials based on environmental problems in the form of tin mining activities on Bangka Island on environmental pollution material for seventh-grade junior high school, so that it can be used in learning process.
Analysis of the ability of students’ communication skills and self-efficacy on science instruction
Authors: Ichsan A F R A , Adawiyah R , Wilujeng I
Published: January 2020

This study aims to determine the relationship between communication skills and students’ self-confidence based on personal self-perspective related aspects of skills, changes in educational trends, and knowledge. This study uses survey research with a questionnaire instrument in gathering data. The sample uses random sampling, which is class VII students of 32 people. The questionnaire used in the study had a Sig. <0.05 which is 0.01. Based on research data, it is known that there is a positive relationship between communication skills and students’ self-efficacy in learning science of students of SMP N 1 Banguntapan-Yogyakarta.
Analysis of Junior High School student’s critical thinking skills integrated with the local potential of eremerasa nature tourism
Authors: Suryani I , Senam  , Wilujeng I
Published: January 2020

This study aims to determine the critical thinking skills of junior high school students integrated with the local potential of Eremerasa nature tourism. This research used survey method with samples determined by the purposive sampling technique. The research subjects were 70 students of class VIII junior high school students. The instrument used to measure students’ critical thinking skills is 5 items of critical thinking skills test about the interaction of living things with the environment that is integrated with the local potential of Eremerasa natural tourism, the instruments have been developed by researchers and have been validated by experts. Data analysis was performed in quantitative descriptive percentages. The results of the analysis showed that students’ critical thinking skills on indicators finding problems of 38.43%, make hypotheses of 37.30%, solve problems of 36.30%, evaluation of 38.71%, and make conclusions of 34.29%, overall the average of critical thinking skills indicators of junior high school students is 37.06%. The results of this study indicate that the critical thinking skills of junior high school students about the interaction of living things with the environment are integrated with the local potential of Eremerasa nature tourism in the low category.
Development of science chess media based on Higher Order Thinking Skill (HOTS) to increase the understanding of science concept in students
Authors: Citrasukmawati A , Julianingsih D , Trisnawaty W
Published: January 2020

This research generally aims to develop science chess media based on Higher Order Thinking Skills that valid for students. The specific objectives of this research are (1) developing science chess media based on higher order thinking skills, (2) knowing the feasibility of developed learning media, (3) knowing student learning outcomes after participating in learning using science chess media based on Higher Order Thinking Skills, (4) determine the response of students after learning. The application of science chess in learning uses one group pretest-posttest design. The research method used is development research by following 4 phases of Plomp. There is problem, analysis, design & develop prototype, and evaluation and then continued with the application using the one group pretest-posttest design. Based on research, it can be obtained: 1) the feasibility of science chess media based HOTS in the aspects of content feasibility, presentation, language according to BSNP (National Education Standards Board), and contextual assessment are in the category of decent to use, 2) the increase of student’s understanding on scientific concepts using science chess media based HOTS is 62.5, and 3) students gave a positive response to the science chess media based HOTS.
Development Virtual Reality IPA (VR-IPA) learning media for science learning
Authors: Monita F A , Ikhsan J
Published: January 2020

The science laboratory facilities in schools are inadequate. Therefore, the researcher developed a science learning media by utilizing virtual reality technology in the form of application that runs on smartphone. The objectives of this study are: (1) to determine the validity of VR-IPA media; (2) to determine the practicality of VR-IPA media from the science teachers; and (3) to determine students’ responses to VR-IPA media. This media development used the ADDIE development model. The instruments used were media validation sheets, science teachers’ assessment sheets, and student response sheets. The result shows that: (1) the validity of VR-IPA media is in very good category; (2) the practicality of VR-IPA media is in very good category; and (3) the students’ responses to VR-IPA media are very good. In brief, it can be concluded that VR-IPA media is suitable for use in science learning.
How to develop students’ scientific literacy through integration of local wisdom in Yogyakarta on science learning?
Authors: Hastuti P W , Setianingsih W , Anjarsari P
Published: January 2020

Local wisdom in Yogyakarta is very diverse, potential as a learning sources that can be integrated in the science learning process to develop the scientific literacy, which needed in 21stcentury learning. This research is to produce learning tools based on local wisdom to enhance the students’ scientific literacy. This study used the Plomp’s Model with several phases namely 1) Analysis, 2) Design, 3) Development, 4) Evaluation and 5) Implementation. The instruments used in this research were validation questionnaire of product and instrument for measure of scientific literacy. The result showed that (1) identification local wisdom in Yogyakarta which used in science learning and accordance with topic environmental pollution was utilizing waste batik as a result of the process of making batik in Yogyakarta, (2) learning toolkit based local wisdom have been produced namely lesson plans and students’ worksheet with excellent category of both, and (3) integrating local wisdom in science learning that was develop scientific literacy in very good category. It indicates that learning tools based on local wisdom was effective to use in science learning to develop scientific literacy.
Organic acid produced by lactic acid bacteria from bekasam as food biopreservatives
Authors: Desniar  , Rusmana I , Suwanto A , Mubarik N R
Published: January 2020

Bekasam is one of the Indonesian fish fermented products that contain lactic acid bacteria (LAB). Previous research has obtained four LAB strains which are considered as bacteriocin producers, have antibacterial activity against pathogenic bacteria from food. In addition to a bacteriocins, LAB produce another compounds, such as organic acids. This study aimed to determine the produced organic acids and their antibacterial activity during LAB growth against of Lactobacillus monocytogenes, Staphylococcus typhimurium, Escherichia coli, Bacillus cereus and Staphylococcus aureus, to determine the organic acid contents using HPLC and to identify LAB isolates using molecular method based on 16S rDNA sequences. The four LAB strains (BP (3), BP (20), BI (3) and SK (5)) were grown in MRS broth medium, then incubated at 37 °C for 48 hours and every 4 hours incubation was tested of titratable acid total (TAT), pH, LAB growth and antibacterial activity. The result showed that the exponential phase of bacteria growth occurred at 16-20 hours incubation and at the end of the exponential phase produced the highest antibacterial activity in the four LAB strains. The highest growth, TAT and antibacterial activity produced by the SK (5) strain. The highest organic acids content were lactic acid in the SK(5) strain and acetic acid in the BI(3) strain. Identification result indicated that BI(3), BP(3), and BP(20) strains were Pediococcus pentosaceus IE 3 with similarity of 98%, 97%, and 98%, respectively. While SK(5) strain showed 93% similarity to Lactobacillus plantarum subsp. plantarum NC 8. The four LAB strains produced organic acids and had antibacterial activity, so they can be developed as food biopreservatives.
Study on stock structure of Indian mackerel (Rastrelliger kanagurta Cuvier, 1816) in Fisheries Management Area 712 of Indonesia using morphological characters with Truss Network Analysis approach
Authors: Hakim A A , Kurniavandi D F , Mashar A , Butet N A , Zairion  , Maduppa H , Wardiatno Y
Published: January 2020

The management of fish stocks is essential for the maintenance of a healthy and profitable fishery. One of important knowledge regarding the matter is the stock structure of the target fish, and fish morphology can be used to determine the stock structure. In fishery point of view, Indonesian waters are divided into 11 Fisheries Management Area. This study was aimed to reveal the stock structure of the Indian mackerel(Rastrelliger kanagurtaCuvier, 1816) in Fisheries Management Area (FMA) 712. The fish collection was made in three different locations, i.e. Lancang Island, Cirebon, and Madura Island. Thirty-four morphological characters were measured to determine the stock structure with Truss Network Analysis (TNA). The results showed that both of conventional method and TNA revealed two stocks of Indian mackerel in the in FMA 712. The first stock was the fish population of Lancang Island and Cirebon, and the other was the population of Madura Island. The discriminant analysis also showed a similar result. For best future sustainable fishery management in Indonesian waters, more research on stock structure of any commercial fish in each fisheries management area of Indonesia is warranted.
Kaizen implementation in seaweed aquaculture (Gracilaria sp.) in Karawang, West Java: A productivity improvement case study
Authors: Hasanah F A , Nurhudah M , Mulyono M , Dillon M
Published: January 2020

Seaweed is an important and high economy value commodity. There are various methods to increase the quality and productivity. The aim of the study was to improve the quality, quantity and production of seaweed (Gracilaria sp.) by using Kaizen approach. There were intervention ways; those were long line method, grouping method and charcoal pocket application. This study was conducted for 3 months from March 25, 2018 to May 25, 2018 (one cultivation cycle) in Tambaksari village, Karawang, West Java. Some parameters were observed during the study including daily growth rate (weight and length), water quality parameters (pH, temperature, salinity, dissolved oxygen, nitrate, high water), and productivity. The measurement of weight and length of thallus were conducted once a week, while for water quality parameters were once every three days. The long line method in deeper part of pond had higher profit (7.7% or IDR 12,451,200) than that of in shallower part of pond (IDR 11,195,200). Grouping method resulted better quality of harvested seaweed and led to get higher profit (17% or IDR 4,400,665) than that of without intervention (IDR 1,681,165). The charcoal pocket application influenced to the growth rate of non pocket treatment was about 416,46 g/week than that of with pocket (233.11 g/week) and with charcoal pocket treatment (304.33 g/week). So that the most effective method to be applied was the longline method in deep and grouping method gave more quality impact of harvest result.
An ecosystem services perspective for the economic value of seafood production supported by seagrass ecosystems: An exercise in Derawan Island, Indonesia
Authors: Kurniawan F , Arkham M N , Rustam A , Rahayu Y P , Adi N S , Adrianto L , Damar A
Published: January 2020

Seagrass meadows provide provisioning services that play a vital role in food security and human wellbeing, especially on the small island. However, the utilisation value is uncalculated as support for seafood production and livelihoods for the community, because they are considered as alternative uses, so that seagrass ecosystem services are underestimated and undervalued. This paper aims to show the economic value provided by seagrass ecosystem services in providing seafood, both as a primary or secondary source. Through field survey and effect on production (EOP) analysis shows that capture fisheries and other marine biota collecting, both crustacean and mollusc species associated with the seagrass ecosystem are utilised directly by coastal communities in Derawan Island, Indonesia. Estimates of the economic value of fish and marine biota employed in the seagrass ecosystem area are US$ US$ 13,488.80 and US$ 35,744.69 per hectare per year, respectively, or a total of US$ 49,233.49 per hectare per year. This value demonstrates the potential importance of seagrass ecosystems. Unfortunately, these benefit values have not been fully understood by the communities, so that many people ignore the function of seagrass ecosystem services as provisioning services, although in the scarcity the utilisation of the seagrass ecosystem is quite intensive. Hence, the precautionary principle and suggesting conservation actions in a participatory manner is challenging to implement.
The Responsible Seafood Tool (RESET): Empowering businesses in Asia to source seafood more responsibly
Authors: Lee M K K
Published: January 2020

The current situation observed in the seafood industry demonstrates that responsible and certified seafood produced in Asia as well as other developing regions is often exported out to Western markets such as Europe and the US, due to a higher demand and higher willingness to pay. This renders responsible and certified seafood to be shipped out of Asia and results in a market where responsible and certified seafood is systematically underrepresented. Hence, the lack of supply of responsible seafood from regional sources has hindered companies’ efforts to source responsibly, despite a commitment to do so. With Asia’s increasing disposable income and growing awareness by consumers for responsible and certified seafood, greater opportunities can be leveraged upon by World Wide Fund for Nature (WWF) to increase the supply and demand of responsible seafood in the region. The Responsible Seafood Tool (RESET) is developed as WWF believes that there is opportunity for change in empowering businesses in Asia to source more responsibly, particularly for a local favourite - seafood. Responsible seafood sourcing helps to reduce negative consequences to the environment, in the form of biodiversity loss, seascape degradation, and resource depletion, as well as to reduce lost livelihoods displaced by depleted fishstock or polluted landscapes and seascapes. The tool seeks to lower the barriers for businesses to source for responsible seafood, and to directly mobilize improved management and performance of fisheries and aquaculture in Asia. In a nutshell, RESET aims to provide easy access to the supply of responsible seafood for interested buyers, while also supporting Asian aquaculture and fisheries by providing business incentives for certification. Seafood buyers enjoy the access of a variety of responsible seafood from Asia, at the same time, they enable WWF to propel responsible seafood producers along their journey to achieve Aqualculture Stewardship Council (ASC) or Marine Stewardship Council (MSC) certification.