bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of higher order thinking skills instrument test for pre-service biology teachers based on marine ecology toward sustainable development
Authors: Jumrodah J , Liliasari S , Adisendjaja Y H , Sanjaya Y
Published: January 2021

This research used quantitative descriptive approach. It aims to analysis the quality of instruments test include validity, reliability, difficulty level and index of determinant to develop tests of critical thinking skills and creative thinking skills of prospective pre-service biology teachers on marine ecology theory. The test used instrument consisted of 2 type namely question descriptions and two tier multiple choice. There were two test of validation, namely content validation and empirical validation. The results of content validation concluded the question tests that feasible to be used with improvements. The results of empirical validation show that the ten items are valid question descriptions category and two invalid categorized questions. Where as instrument test twenty-three of two tier multiple choice valid in categories and four invalid categorical questions. Question descriptions instrument test used reliability analysis using Cronbach Alpha r11 = 0.73 (high). Instrument test two tier multiple choice used KR-20 r11 = 0.83 (very high), therefore the instruments test made are suitable for implementation in marine ecology. The average value of high order thinking skills for the question descriptions instrument test achieved by students was 26, while the two tier multiple choices instrument test 28. The highest value of the description questions instrument test achieved by students is 56 and the lowest score is 3. The highest value of two tier multiple choice questions instrument test achieved by students is 56 and the lowest score is 11. It shows that the ability of high order thinking skills of students is still lacking.
Ethnobotany study of medicinal plants in Bengkulu as a medium of student learning: The Euphorbiaceae family
Authors: Kasrina K , Zukmadini A Y
Published: January 2021

Ethnobotany study is a way to uncover the diversity of plants that are used in an ethnic or region. Although ethnobotany research has been done in Bengkulu, there are still a lot of data that has not been revealed and the results are still not well documented. From the results of the exploration of medicinal plants that have been done by Euphorbiaceae is one of the largest families reported utilization, and the types used are different between regions, so the utilization information has not been recorded as a whole. On the other hand, this family is one of the selected families to be studied by students. This study aims to inventory the medicinal plants of the Euphorbiaceae family that are utilized by Bengkulu society which can be used as media for student learning. Research methodology by conducting field surveys (by means of exploration, observation, interviews with informants chosen by purposive sampling) and literature studies. Data analysis was carried out descriptively. From the results of research on the family Euphorbiaceae found 18 types of medicinal plants including: candlenut (Aleurites moluccina), earrings (Acalypha australis) bone wood (Euphorbia tirucalli), Jatropha curcas and others. The use of these plants for the treatment of tonsils, headaches, wound medicine, malaria, jaundice, magh, itching, colds, warts, heart disease and so forth. Jatropha curcas is a commonly used plant and the benefits are varied. The data of 18 types of plants are then documented in a Bengkulu medicinal plant dictionary along with other plant species, so that they can be used as student learning media.
Student discussion skill activities on microbiology courses through lesson study
Authors: Murniati N , Susilo H , Listyorini D , Irwandi I
Published: January 2021

Lesson study is an educator professional development program through collaborative and continuous learning based on the principles of collegiality and mutual learning. This lesson study activity aims to increase student discussion activities in the Microblogy course at the Teacher Training and Education Faculty Biology Study Program at Muhammadiyah University of Bengkulu. This research was a classroom action research using 4 cycles. It used a qualitative design with a problem-based approach. The lesson study implementation phase was planning (Plan), implementing learning (Do) and Reflection (See). The topics chosen in the lesson study activities were (1) Bacteria (2) Fungi, (3) Protozoa, and (4) Viruses. The data collection used observation sheet observation of student discussion activities through lesson study activities. The data collected were then analyzed by descriptive qualitative. The results of lesson study activities showed the increasing in skills activity to student discussions in microbiology courses at the Teacher Training and Education Faculty of Muhammadiyah University of Bengkulu. Continuous implementation of lesson study in the lecture process improved the professionalism of lecturers. Along with the increase in lecturer professionalism, it had an impact on the effectiveness of learning activities and improving the quality of education as a whole.
Application of Plackett-Burman and Box-Behnken experimental designs in differential voltammetry for determining Gadolinium concentration
Authors: Wyantuti S , Harahap F W , Hartati Y W , Firdaus M L
Published: January 2021

Middle group rare earth elements, such as Gadolinium, have an important role in a variety of applications, mostly used in high-tech industries because they have good mechanical strength. However, the rare earth elements of this middle group are difficult in their analysis because each element has almost the same physical and chemical properties. Gadolinium is one of the rare earth elements that have high paramagnetic properties. The purpose of this study was to determine the gadolinium content by differential pulse voltammetry using an experimental design. Plackett-Burman experimental design was used to obtain selected factors that have positive results to the method. A total of 11 factors that have the potential as the main influence in this study were selected at the highest (+) and lowest (-) levels, and then measured 12 times according to the Plackett-Burman experimental design. Furthermore, optimization was carried out with the Box-Behnken experimental design by performing 15 measurements to obtain the optimum conditions for each factor. Response data was processed and obtained factors with optimum conditions, deposition potential of -2.0 V, modulation of the amplitude of 0.1 V, and a deposition time of 120 seconds. The detection limit and the quantitation limit were 3.97 mg/L and 10.71 mg/L, respectively. The recovery of Gadolinium was 95%, which is satisfactory.
Green route of silver nanoparticles synthesis using watermelon (Citrullus lanatus) fruit extract for mercury ions detection
Authors: Firdaus M L , Apriyoanda H , Elvinawati E , Rahmidar L , Astuti A P , Swistoro E , Sundaryono A
Published: January 2021

In this paper, we report the green synthesis of silver nanoparticles using a reductant of fruit extract of watermelon (Citrullus lanatus), and its application for mercury ions detection. Silver nanoparticles were made from small amount of silver nitrate, assisted with sunlight irradiation. After 30 minutes of irradiation, the yellowish-brown silver nanoparticles were formed with peak absorbance at 420 nm wavelength. The formed silver nanoparticles were then tested to various alkaline, alkaline earth and transition metals. Most of the metals has no effect to the silver nanoparticles except for mercury ions that change the color of silver nanoparticles to colorless. Therefore, silver nanoparticles are selective to detect mercury ions in aqueous solution. Compared to the reference method, the developed colorimetry method for mercury ions detection was accurate up to 99.38%.
Innovative chemistry education: An alternative course models in the disruption era
Authors: Liliasari S , Amsad L N , Wahyudi A
Published: January 2021

In the era of IR 4.0 and society 5.0 is existed the global disruptive in every aspect of human life even in the education world. This study literally stated the innovation course models in chemistry education. The innovative learning models directed to be able to develop the ability of students’ use of the ICT and work together and communicate with one another in chemistry learning, especially in laboratory activities. The study of Biochemistry showed that laboratory course should be done before the theoretical course. Study of LPBSOURA in Organic Synthesis course using a retrosynthetic approach shows that students applied their concept mastery of several courses related before, green chemistry and skilful in software application in predicting target molecule. The studies also show that innovative learning models could improve students’ generic science, creative and critical thinking skills, using project based learning that can increase students’ thinking and skills to prepare them to face this era.
Problem solving learning model using video application
Authors: Handayani D , Alperi M
Published: January 2021

Lecturer play an important role in the process of planning the learning activities, one of them is in the selection of learning model. This research aims to improve the student activities and learning outcomes in the course of chemistry food materials using problem solving learning models integrated with video media. This research was a classroom action research, which consists of 3 cycles. The participants were students of the chemistry education study program who enrol chemistry food materials courses in the odd semester of academic year 2017/2018, totally 35 people. The data analysis technique is by calculating the average value and classical learning completeness. The data were gathered from test in the end of every cycle. It was found that the student’s ability in learning process improved after the implementation of Problem Solving model. It could be seen in the improvement of average score for each test, from 78,81 in cycle I, 80,18 in cycle II to 85,69 in cycle III. In addition, classically learning completeness of students also improved, from 82,86 % in cycle I, 88,57 in cycle II to 100 % in cycle III.
The development of Chemistry Teaching Guide (CTG) on electrolyte solution and redox reaction based on scientific inquiry
Authors: Solikhin F , Sari L P
Published: January 2021

The purpose of this study is to develop a chemistry teaching guide (CTG) for electrolyte solution and redox reaction based on scientific inquiry and find out its quality through the assessment of high school chemistry teachers. The choice of electrolyte solution and redox reaction material because this material is material that is easily developed into a scientific inquiry-based activity. This is research and development (R&D). The CTG was assessed by high school chemistry teachers who had taught the material for at least 2 years. The quality of the results of development is reviewed from the 5 assessment components, namely content, presentation, language, implementation, and display. The results of this study are that CTG based on scientific inquiry has been developed. The quality of the CTG is Very Good in terms of the results of the chemistry teachers assessment. Thus, CTG is feasible to be used by teachers as a guide in learning electrolyte solution and redox reactions based on scientific inquiry.
Stoichiometry using guided inquiry model for enhancing creative thinking skills
Authors: Amida N , Nurhamidah N
Published: January 2021

This study aims to enhance creative thinking skills of students using guided inquiry model trough of Stoichiometry. This study used quasi-experimental methods, with pretest-postest non equivalent control group design. Subjects of this study were biology students enrolled in basic chemistry, consist of 35 students in experimental class and 35 students in control class. Instrument in this study were essay test that involves 3 indicators of creative thinking skills (i.e. fluency, flexibility, and elaboration) and also student worksheets. The results showed that Stoichiometry using guided inquiry model have been enhance for creative thinking skills in medium category with a value of  0.48.
Dynamic programming for an optimization of production plan
Authors: Rafflesia U , Widodo F H , Angraini T
Published: January 2021

This study discusses the optimization of production plans in a convection company using a dynamic programming. Fluctuating demand requires the convection company to implement a strategy to control the production process so that there are no shortages or excess products. The purpose of this study is to find out the total minimum costs in preparation of school uniform production plans for the next one year using dynamic programming. The initial steps used in the production planning is predicting the demand of product from average demand in the previous 3-year period. The implementation of dynamic programming divides the problem into 12 stages due to monthly periods for one year. The results of this study obtained the total minimum cost of production plan for the next 1 year. The production plan through dynamic programming is able to maintain the existence of a convection company for the next few years.
Augmented Reality assisted by GeoGebra 3-D for geometry learning
Authors: Widada W , Herawaty D , Nugroho K U Z , Anggoro A F D
Published: January 2021

Geometry becomes a difficult subject for students. The abstract object was one of the factors. Therefore, more concrete learning media are needed. One of them was augmented reality assisted by GeoGebra. The purpose of this study was to determine the ability to understand the geometrical concepts of high school students through augmented reality learning assisted by GeoGebra. Treatment was given to students through learning using GeoGebra-assisted augmented reality. This was a quasi-experimental study with a pre-test post-test control group design. This research instrument was a test of the ability to understand the concept of geometry. The test was used to measure students’ initial abilities, and this was referred to as a covariate. Also, to measure the ability to understand concepts after students follow augmented reality learning assisted by GeoGebra. Data were analyzed by covariate analysis (ANCOVA). The results of this study were F = Fo (A) = 9,150 with p-value = 0,000 <0,005. That means, there are differences in the ability to understand the concept of geometry between those taught with augmented reality which is assisted by GeoGebra and conventional learning. Other results show that t = 6.723 with p-value = 0.000 <0.05. This shows that the ability to understand the geometry concepts of students taught with augmented reality assisted by GeoGebra was higher than students who were taught conventionally after controlling for covariates. The conclusion was that the ability to understand the concepts of geometry through GeoGebra-assisted augmented reality learning was better than students taught with ordinary learning.
Potential effects of developing student worksheets based on the context of Lubuklinggau main subject in class VII
Authors: Adha I , Refianti R
Published: January 2021

The purpose of this study is to produce student worksheets (LKS) which have a potential effect on student learning outcomes. The subjects of the study were students of SMP N 8 Lubuklinggau in class VII.D in the 2019/2020 school year. The approach used in the development of LKS is using the Indonesian realistic mathematics approach (PMRI). The method used in this research is research and development (R&D) using a 4-D model that has been modified to become 3-D. Which consists of defining, designing and developing. The potential effects of worksheets developed can be seen from the activities of students in working on problems in worksheets, where students more easily understand the mathematical concepts contained in worksheets. Of the 33 students who were the subjects of the study, 19 were in the excellent category or around 57.6%. Whereas in good category there are 7 people or around 21.2%, enough categories are obtained by 5 people or around 15.2% and less categories are obtained by 2 people or about 6%. Based on the results of these percentages it can be concluded that the worksheet designed has a potential effect on student learning outcomes.
Implementation of realistic mathematics education learning model with outdoor approach in elementary school: Study of presenting and processing data
Authors: Haji S , Yumiati Y
Published: January 2021

This research was aimed to implement Realistic Mathematics Education learning model with outdoor approach in elementary school at Bengkulu. The method used in this research was quasi-experiment. The research design used was pre-test post-test group design. Sample of the research were 94 students taken from 5th grade elementary students in Bengkulu. The instrument used about presenting and processing data was 4 items. Data was analysed qualitatively and quantitatively. The result from the research shows that Realistic Mathematics Education learning model with outdoor approach in elementary school students may improve student’s understanding ability about mathematics concept for high level school by 0.45; for medium level school by 0.41; and for low level school by 0.27. Meanwhile, the achievement of students’ mathematics concept understanding in elementary school for high level school is 77.31; for medium level school is 73.92; and for low level school is 57.86. The implication of research result is that the use of Realistic Mathematics Education learning model with outdoor approach is needed to improve the mathematics concept understanding of elementary school students.
Analysis of mathematics textbook use: An argument for combining horizontal, vertical, and contextual analyses
Authors: Rahimah D , Visnovska J
Published: January 2021

This paper contributes to a larger endeavour of understanding how mathematics textbooks are used in classrooms and what shapes the specific forms of their use. Three types of mathematics textbook analysis have been previously identified, namely, horizontal, vertical, and contextual analysis. Based on literature review, we discuss how these three types of analysis can be usefully combined, and explain why contextual analysis, where data on textbook use is collected in classrooms, provides the most revealing insights. We argue that because of its relevance for textbook design as well as for teacher professional development, researchers should consider including the contextual analysis when analysing textbooks.
The multiple intelligence optimize activity using discovery learning models that improve learning outcome in trigonometry course
Authors: Muchlis E E , Maizora S , Rahimah D
Published: January 2021

The aim of this research was to describe the Multiple Intelligence optimize activity using discovery learning models that improve learning outcome in trigonometry class. The type of this research was classroom action research, with the steps were planning, implementing, observing and reflecting. The subject of this research was students of Mathematics Education who took trigonometry class in the first semester of the academic year 2017/2018. The instrument used was a test of Multiple Intelligence, observation sheet and learning outcome test. The results of the analysis of activity observation sheet with discovery learning and Multiple Intelligence tests obtained: 1). Linguistic intelligence was optimized with the discussions and respond to the problem, 2) Mathematical-logical and intrapersonal intelligence optimized through the activities of verification, 3) musical intelligence was optimized through listening to music in the application of the concepts activity, 4) Space-visually intelligence optimized through working on the problems in the application concept activity, 5) interpersonal intelligence was optimized through data collection activity occurred cooperation in solving the problems 6) Space-spatial intelligence could optimized directly by expressing the concept after making the observation and manipulation of props. The average of learning outcome increased in every cycles, the average of learning outcome in the 1st cycle was 69,92. The average of learning outcome in the 2st cycle increased to 78,45. The average of learning outcome in the 2st cycle increased to 85,48.
The ability to solve mathematical problems through realistic mathematics learning based on ethnomathematics
Authors: Lubis A N M T , Widada W , Herawaty D , Nugroho K U Z , Anggoro A F D
Published: January 2021

Problem-solving is one of the goals of mathematics learning. Ethnomimetic-based realistic mathematics learning is learning with starting-point contextual problems that are close to students’ minds. This study aims to determine the effect of ethnomathematics-oriented realistic mathematics learning on problem-solving abilities. That is a type of quasi-experimental research. The study design was a non-equivalent control group. The population is SMA N 2 Kota Bengkulu in 2019. The sample of this study was 68 students from Class X MIPA A and X MIPA D. The research instrument was a test of problem-solving skills. Data were collected through tests and analysed by covariate analysis. The results of this study are that realistic mathematics learning oriented to ethnomathematics has a positive effect on the ability to solve. The conclusion is that realistic mathematics learning with ethnomathematics orientation can improve mathematical problem-solving skills for secondary school students. We suggest that mathematics teachers can develop realistic mathematics learning tools with ethnomathematics as a starting point for learning.
Development of student worksheets based on guided inquiry for grade VIII SMP 22 Kota Bengkulu cube and cuboid material
Authors: Lestari W P , Syafri F S , Saltifa P
Published: January 2021

The purpose of this research development is to develop guided inquiry-based worksheets on the material of Cubes and Beams in Class VIII SMP Negeri 22. This research uses the Plomp development research model including the initial investigation phase (preliminary research), the development or prototype phase (development or prototyping phase), and the research phase (assessment phase). The LKS product test results show that the LKS developed on the material of Cubes and Beams are valid, effective and practical. So it can be concluded that this worksheet can be used in learning mathematics.
Metal incorporated Philippine Abaca fiber (Manila hemp) as a potential novel filter for water disinfection
Authors: Garcia K A , G Peroja K-A , Tuberon NA L , Cambiador CJ B , Cid-Andres A P
Published: January 2021

The contamination of water sources by pathogenic bacteria poses a threat both in the environment and in human health. The incorporation of metal nanoparticles in polymer matrix which is abundantly available in a country can be improved to enhance its antimicrobial property. This study was focused on the development of a novel antibacterial water filter from synthesized silver-copper nanoparticles (Ag-CuNPs) incorporated into Philippine abaca fiber (Manila Hemp). Pre-treatment method and determination of adsorption capacity of abaca fiber towards metal ions, Ag+ and Cu2+ were done prior to synthesis of Ag, Cu and Ag-Cu nanocomposites. Alkali treatment of the fiber confirms OH, C-O and C=O of a cellulose, pectin and lignin in the FTIR analysis. These groups effectively altered the nature of the abaca fiber to hydrophobic, thus, increasing its adsorption capacity up to 80%. Morphological and structural properties of the formed nanoparticles were confirmed using scanning electron microscopy (SEM) revealing polymeric matrices of the fiber in the particle size of 80 nm – 100nm. UV-Vis spectra revealed a broadening of the absorption spectra of a bimetallic Ag-Cu nanoparticles at 410 nm. The antimicrobial assay results revealed promising synergism of the combined silver and copper nanoparticles against both Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) bacterial strains in synthetically prepared water. Also, a relatively proximate bactericidal efficiency was attained between the CuNPs and Ag-CuNPs abaca fiber composites. The developed Ag-CuNPs abaca fiber composite can act as novel antibacterial water filter for water disinfection.
The feasibility of electrostatic teaching material: Oriented to conceptual understanding
Authors: Maison M , Alrizal A , Wardana R W , Natalia U
Published: January 2021

Conceptual understanding is one of the important things in physics learning. Many factors affected the conceptual understanding of students; one of them was the book. Based on the data from the implementation of a questionnaire on junior high school students, their learning resources (books, etc.) have not been able to help them understand many concepts of physics including the concepts of electrostatics.Some abstract concepts in physics make them more difficult to understand physics. This study aimed to develop electrostatic teaching material-oriented to conceptual understanding for junior high school students. We use the ADDIE model, i.e., analyze, design, development, implementation, and evaluation. The result of this study shows that the teaching material is feasible to use in learning based on the feedback from validators.
Identification of debriefing 21 st century skills on aspects of critical thinking skills and communication skills in Bengkulu high school students in physics subjects
Authors: Hanicza Y , Putri D H , Hamdani D
Published: January 2021

This research was aimed (1) to identify category the 21st Century skills in the aspects of critical thinking skills of Bengkulu City High School students in physics subjects (2) to identify category the 21st Century skills on the aspects of communication skills of Bengkulu City High School students in physics subjects. The type of this research was Descriptive Research. The research samples was 90th grade Mathematics and Natural Sciences amounted to 90 students, MIPA class XI amounted to 90 students, and MIPA class XII amounted to 20 students from 3 high schools of Bengkulu City namely SMAN 2 of Bengkulu City, SMAN 4 of Bengkulu City, and SMAN 10 of Bengkulu City. The research was on 18 February - 22 March 2019. Data collection techniques used in this study were questionnaires, interviews, observation and documentation. The results of the data obtained were then triangulated and described with narrative text. Based on data analysis obtained debriefing 21st century skills on aspects of critical thinking skills students high school of Bengkulu City in physics subjects was in the sufficient category with an average score of 3.61 and obtained debriefing 21st Century skills on aspects of communication skills of Bengkulu City High School students in physics with an average score of 3.97 was in the good category.
The analysis of physics concepts application on the foundation structure of the Jambi’s traditional house to build character education
Authors: Pujaningsih F B , Kurniawan W , Putri N , Bahar F F , Pratomo S
Published: January 2021

The concept of physics can be applied to aspects of customs and culture in order to preserve local wisdom. One way to introduce the customs and culture of the local area can be done by studying traditional houses. The foundation structure of the Jambi’s traditional house uses wooden poles arranged to support the weight above where. Mass of each pole has a correlation with the amount of load that has been distributed evenly. The purpose of this study is to analyse and explain the application of physics concepts in the foundation structure of traditional Jambi houses and to build character education to new generation. The process of collecting data is done by interview, observation, and documentation. The results of interview section are about the advantage of using wood, philosophy and meaning of foundation structure. Based on the data analysis of observation, it is shown that the mass of each pole is strong enough to support the live and dead load that has been analysed. Because it has a pole mass greater than the distributed load. So this can educate the new generation to know the process of making foundation structures with certain calculations that can be analysed through physics concept.
Categorization intermediate conception of the third year students’ of physics education program in electromagnetism wave sub-concepts
Authors: Wardana R W , Liliasari L , Tjiang P C , Nahadi N
Published: January 2021

Some results on the conceptual change, indicated a discriminate between alternative and scientific conceptions. This could be represented as a medium conceptions, called the intermediate conceptions. Researches on the electromagnetic wave sub-concept generally assessed based on modern physics conceptions, on the other hand it needs to be assessed based on the concept of electricity and magnetism. This research aims to identify and describe category of intermediate conception of third year physics education students in electromagnetic wave sub-concepts. This research used descriptive method. The subjects of this research were 73 third year students in a University of Teacher Training at Bandung. Data collection have been done by essay test and interview. The analyzed data shows that 77% of the students are on ‘lateral intermediate conception’category and none of them were on ‘naïve physics’. Other results showed that the students have difficulty on describing, explaining, interpreting qualitatively about electromagnetic wave sub-concepts.
Development of multiple representation based mechanics lectures using dependent and independent field (MR-FD & FI)
Authors: Hartini T I , Liliasari S , Setiawan A , Ramalis T R
Published: January 2021

This study aims to develop mechanics lectures based on multiple representations using field dependent and field independent cognitive styles (MR-FD & FI), in understanding the mastery of the concept of mechanics. In the context of physics learning based on multiple representations is to combine two or more representations as a form of learning development that is used to understand and convey physics concepts. Cognitive style can be divided into two, namely: dependent field cognitive style (FD) and independent field cognitive style (FI). The third semester student research subjects numbered 21 students from a university in Jakarta Indonesia. The first instrument used consisted of modules containing MR-based content consisting of 4 mechanical contents namely; gravity and central force (GGS), particle system dynamics (DSP), rigid body rotation (RBT) and rigid body rotation in three dimensions (RBT3D) that must be filled. The second instrument is a student worksheet (LKM) in which there are questions in accordance with the indicators and objectives of MR-based lectures undertaken by students. Descriptive quantitative and qualitative research methods were carried out to get a clear picture of the implementation of MR using the cognitive styles of FD and FI. The results showed that most students have a field dependent thinking style (FD) seen in the post-test results on GGS material 61.90%, RBT 61.90%, DSP 57.14% and RBT3D 57.14%. For independent field thinking (FI), the results of post-test results were 42.86% DSP, RBT 38.10%, RBT3D 38.10% and GGS 33.33%. It is concluded that students’ thinking styles can change from thinking styles that were initially field dependent (FD) can change to field independent (FI). This can occur due to various factors, including; 1) Health conditions, classrooms and students focus; 2) The level of difficulty and ease of conceptualization of the material being studied; 3) Basic math and physical abilities. Limitations in this study involve only subjects from small classes from one university, so the results are not strong enough to represent the overall situation, this could be a way to conduct further research with more students and various subjects. This study is the first to map the understanding of the concept of mechanics based on multiple representations using the cognitive style of FD and FI, the results of the study find new discoveries, where all students have a cognitive style of either FD or FI.
Structure analysis of student worksheet for junior high school science subject using the Vee diagram
Authors: Permana I , Nuraeni E
Published: January 2021

The purpose of this study was to analyze the student worksheet structure of science subject of junior high school grade 8 based on the Vee diagram framework. The analysis was conducted on 39 worksheets from the 3 most widely used source textbooks in Bandung, West Java, Indonesia. The worksheet analysis is performed using a checklist of completeness and whether the worksheet components are presence or not based on Diagram Vee components, namely focus questions, object/events, theory/concepts/principles, notes/transformations, and knowledge claims. The quality measurement of the student worksheet structure for each component is carried out using the presence rubric of Diagram Vee components and the scoring rubric to the presence of the Diagram Vee components. The results showed that almost all worksheets had the components of focus questions and objects/events. However, several Diagram Vee components are found with poor quality in all worksheets, with the lowest component is in the theory/concept/principle.
Educational potential of landscape-recreational resources of shore areas of Lake Baikal
Authors: Atutova Zh V , Kobylkin D V , Zhao M
Published: January 2021

We made a map of the contemporary landscape structure on the site of the Goloustnenskoe coast to analyze the recreational development of the coast of Lake Baikal; based on this map, we identified the main factors of natural attractiveness for the development of the tourism industry. We determined historically formed and preferred types of recreation activities. With a view to reveal environmental problems, we identified the main directions for recreational activities that have the greatest negative impact on the functioning of landscape complexes in the area. It is noted that a low level of ecological culture of vacationers is often the main reason for the activation of adverse events. Having considered the high degree of sensitivity of landscape complexes to anthropogenic impact, we proposed ecotourism-oriented leisure activities that can not only reduce the burden on the part of recreational activities but also increase the level of environmental morality. Besides, we provided examples of recreational facilities, already existing on the Goloustnenskoe coast of Lake Baikal and methods of their management, guaranteeing environmental stability, which is necessary for the implementation of measures aimed at sustainable development of the Baikal territory.
Geo-information analysis of zones with special conditions for territory use for sustainable development: a case of Nizhnevartovsk
Authors: Kuznetsova V P , Kuznetsova E A , Kushanova A U , Isupov V A
Published: January 2021

According the Town Planning Code and the Land Code of the Russian Federation, zones with special conditions for territory use must be shown in the documents of territorial planning and town development zoning. This issue is significant due to the absence of information on the boundaries of such zones in the Unified State Register of Real Estate. Currently, the city of Nizhnevartovsk does not have fully delineated the boundaries of zones with special conditions for territory use for the natural objects and the objects of engineering and transport infrastructure. The aim of research was to make a spatial analysis of the zones with special conditions for territory use in Nizhnevartovsk by means of geo-information mapping in order to study the territorial planning and urban development. The spatial analysis by geo-information mapping revealed that the zones with special conditions for territory use in Nizhnevartovsk do not comply with the current regulatory acts in some aspects or remain partially undelineated. For the purposes of the study, the coastal protection zone, the water protection (fish protection) zone, the railway sanitary protection zone and the aerodrome environs inside the boundary of the city of Nizhnevartovsk were identified. The result of the study was the cartographic materials showing the spatial analysis of zones with special conditions for territory use in the city of Nizhnevartovsk. The widths of the sanitary protection zones around industrial facilities were established taking into account the sanitary classification, the calculated air pollution and the levels of physical impacts.
The history of vegetation and landscapes of the lake Ilchir basin for understanding the modern vegetation structure in the Okinsky plateau
Authors: Volchatova E V , Bezrukova E V , Kulagina N V , Levina O V , Shchetnikov A A , Kerber E V , Krainov M A , Filinov I A
Published: January 2021

The method of detailed sampling of sediments from Lake Ilchir allowed obtaining a high-resolution record of changes in the natural environment, which meets the world modern standards of temporal resolution in the studies of the Holocene environment. The data on the palynological analysis of bottom sediments from Lake Ilchir (51°58’26.0” N and 100°59’29.0” E) enable us to reconstruct the composition of vegetation and the structure of landscapes in the lake basin as well as to understand the process of its change in Middle-Late Holocene. The lake is located in the Republic of Buryatia and is the source of the Irkut River, which flows into the Angara River. The results obtained are unique for the regional Holocene environment, since they allow us to clarify the nature of changes in regional vegetation with an average time interval of 125 years. A reliable age model provides for intra-and interregional correlations of environmental changes that helps to understand the possible causes of changes in regional vegetation. Palynological records from inland regions are important for reconstructing the processes of past changes in landscapes, assessing the sensitivity of ecosystems in these regions to future climatic variations that affect the composition of vegetation and its change in time.
Erosion and accumulative processes in river valleys of the Upper Angara region (as exemplified by the catastrophic floods in 2019 on the rivers of Irkutsk Oblast)
Authors: Opekunova M Yu
Published: January 2021

The article considers development features of erosion-accumulative processes during catastrophic floods in 2019 on the rivers of Irkutsk oblast, in the Angara river basin (as exemplified by the Bol’shaya Belaya river). Considering the combination of morphodynamic channel types we preliminary determined main types, interaction degree of flood waters and floodplain-channel complexes in different areas. We revealed that the most intensive transformations of the floodplain-channel relief are associated with engineering and construction structures that hinder the natural exchange of floodplain and channel flows. The rates of coastal recession during the flood period were revealed; on average, they amounted to 2 m. The processes of coastal erosion-tearing away of bank are typical of sandy loam deposits composing the upper part of floodplain surfaces. The most dynamic areas of bank destruction correspond to the concave parts of the channel bends. Note is taken that the presence of linear infrastructure objects (roads) within the floodplain massifs often caused the flow rates increase and an increase in the volume of transported material, as well as formation of accumulative landforms, which can hinder water exchange between channel and floodplain streams in the future, and also serve as an additional development factor of processes that are negative for a person and can lead to total destruction of infrastructures, or cause significant damage to them.
An overview of physical and social vulnerability of high-risk coastal area after 14 years tsunami – a case study of Banda Aceh
Authors: Sugiarti A S , Meilianda E , Fatimah E
Published: January 2021

On December 26, 2004, tsunami one of the deadliest disasters has occurred in Aceh. Many of the casualties apparently occurred as the result of lack of awareness of tsunami hazards among the communities. Banda Aceh city of Sumatra Island, Indonesia is one of the severely affected coastal areas surrounding the Indian Ocean. After 14 years, despite the remarkable disaster event, peoples tend to return to build their house near the coastal areas, particularly in Banda Aceh. The purpose of this study is to investigate the level of vulnerability of the coastal area of Banda Aceh more than a decade post-tsunami. This research uses GIS and spatial analysis for processing spatial data. The result shows that in 2016 and 2017 Banda Aceh has the highest physical vulnerability, which is 64% whereby one of the highest physical vulnerability was in Punge Ujong and the lowest was in Gampong Pie. On the other hand, in 2017 Banda Aceh has the highest social vulnerability, which is 69%. The area that has the highest social vulnerability was in Punge Ujong and the lowest was in Gampong Pande. Overall, the tsunami vulnerability level in Banda Aceh remains high, particularly in the coastal area. The result of the study implies that despite there is a collective memory of the tsunami of 2004, however, people tend to ignore the risk of living near the coastal areas. Actions in terms socialization on the risk and mitigation strategies should therefore be constitute in the development plan on the city level.
An Evaluation of Changes to The Secondary School Geography Curriculum in Indonesia Disaster Risk Reduction Effort
Authors: Kamil P A , Utaya S , Sumarmi  , Utomo D H , Abdi A W , Ridha S
Published: January 2021

Disaster education in Indonesia has been initiating after the Aceh Tsunami disaster in 2004 which was one of the major disasters that have ever occurred in Indonesia. Disaster risk reduction efforts have been carried out by the Indonesian government by revising the national curriculum. This aims to improve prevention efforts and preparedness for the school community. School students in Indonesia are in extreme risk of natural disasters, especially when they are in school. In this context, a few educational programs for disaster risk reduction (DRR) have been integrated into school subjects. Therefore, this study aims to analyze and evaluate the changes in the geography curriculum for secondary schools that have been revised in Indonesia. The new curriculum began to be implemented in 2013. In this context, this article will focus on analyzing geographic curriculum content that integrates disaster related material that is taught to high school students. Evaluating curriculum changes is aimed at building students’ disaster knowledge with geographic learning in an effort to improve disaster preparedness.
Linking geomorphological features and disaster risk in a school district: The development of an in-service teacher training programme
Authors: Sakurai A , Oda T , Murayama Y , Sato T
Published: January 2021

The dimension and degree of a disaster can depend on the vulnerability of the location, the people and the community. One of the key lessons learnt from the 2011 Great East Japan Earthquake disaster was that schools should prepare a school contingency plan in advance. To do so, they should fully understand their school’s disaster risk in the worst-case scenario in order to protect children’s lives at the school. Therefore, schools are required to customise their preparedness measures according to the school’s locality. The training programme, ‘Understanding disaster risk based on geographic features of a school district’ was developed and implemented in Ishinomaki City, Miyagi Prefecture, which was severely affected by the 2011 tsunami. The training programme was a spin-off of a school-based disaster education programme implemented in Ishinomaki City and was expected to support the customisation of schools’ disaster manuals according to the school district’s disaster risk. In order to strengthen teachers’ map-reading skills, the training was organised in three steps. The first step was to enable teachers to acquire basic map-reading skills and read a contour map to understand the geomorphological features of their school district. The second step was to have teachers compare these maps to hazard maps (for tsunamis, floods and landslides) to understand the links between geomorphological features and disaster risk. The third step was to have them identify emergency evacuation sites and evacuation shelters for each hazard type in their school district. It was found that the training helped to increase the participants’ confidence in understanding these maps.
Study on shear wave attenuation characteristics of shallow sediments in gas hydrate pilot production area of South China Sea
Authors: Zhang Zhenchao , Guo Xiujun , Yang Bin , Tang Haoru , Lei Shiyun , Xing Cheng , Wu Jingxin
Published: January 2021

Shear wave attenuation of sediment is an important acoustic feature of seafloor sediment, which reflects the ability of sediment to absorb and dissipate shear wave energy, which is closely related to sediment structure. In order to explore the change rule and influencing factors of shear wave attenuation in sediments, the absorption coefficient was selected as the characterization of shear wave attenuation characteristics, and unconsolidated undrained triaxial shear tests were carried out with two typical sediment silty sand and fine sand in Shenhu sea area of South China Sea as samples. Through comparative analysis, the experimental results show that the shear wave absorption coefficient of sediment is in the process of shear failure at first, it fluctuated slightly, then gradually stabilized, and finally continued to rise in the fluctuation. The shear wave absorption coefficient increases with the increase of porosity and decreases with the increase of confining pressure. In addition, the relationship between the shear wave absorption coefficient and the undrained shear strength of sediment presents a quadratic function. The smaller the shear wave absorption coefficient is, the higher the undrained shear strength of sediment is.
Analysis of Initial Geostress Field of a Hydropower Project without Measured In-situ Stress
Authors: Huang Taosheng , Ma Shuai , Liu Gao
Published: January 2021

Initial geostress field is an important factor affecting the stress distribution, displacement and failure mode of surrounding rock of underground engineering, and is also one of the important indexes of design for underground works, especially large hydropower projects. At present, the method to obtain the geostress field is mainly based on measured in-situ stress, however some projects are lack of in-situ stress measurement data. To solve this problem, we inversed regional tectonic stress field firstly, and then extracted the boundary load of the project area from the fitted regional tectonic stress field and embedded the underground cavern to be studied in the calculation model to carry out the numerical calculation of the geostress field of the project area. The results show that the direction of regional tectonic principal stress is NNE∼NE, and the average maximum horizontal tectonic stress is about 5.0MPa. The direction of the maximum principal stress in the project area is generally the same as that of the regional tectonic stress field, which indicates that the valley stress field is determined by the regional tectonic stress field. However, due to the influence of river incision, the geostress field of the project area redistributes, and has the basic characteristics of principal stress direction deflection and stress differentiation. The research results provide a basis for the subsequent study of the stability of underground caverns, and have a certain reference value for the method of obtaining initial geostress field of a project without measured in-situ stress.