bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ti/4H-SiC Schottky diode with breakdown voltage up to 3 kV
Authors: Knyaginin D A , Rybalka S B , Drakin A Yu , Demidov A A 
Published: December 2019

Abstract
In this study the breakdown voltage for Ti/4H-SiC type Schottky diode with six guard rings and JTE layer has been calculated by mean of numerical simulations. It is established that increase of the n-type 4H-SiC epitaxial layer from 14 up to 20 μm and addition of JTE layer lead to increase of breakdown voltage value on ∼900 V in contrast to the same diode without JTE. The above-mentioned diode’s structure gives the possibility for designing and production of diode with higher breakdown voltage value up to 3 kV.
Electronic transport properties of microcrystalline GaP
Authors: Uvarov A V , Gudovskikh A S , Vasilev A A 
Published: December 2019

Abstract
Electronic properties of microcrystalline gallium phosphide films deposited on fused silica substrates by plasma-enhanced atomic layer deposition at the temperature of 380°C were investigated. The values of the activation energy of conductivity (Ea = 0.247 eV), the optical value of the band gap (Eg = 2.2 eV) and the long-wavelength edge of photoconductivity (Eph = 1.8 eV) were obtained for this material. The value of Ea could associated with position of Fermi level near to the bottom of the conduction band or barriers at the grain boundaries. The long-wavelength edge of photoconductivity in the layer of microcrystalline GaP is a consequence of the presence of interband states, which are associated with partially disordering.
Formation of out-of-plane film micro arch by methods of technological control of internal stress
Authors: Enns Y. , Kleimanov R. 
Published: December 2019

Abstract
In this work is presented the analysis of the manufacturing technology of arcuate elastic elements. In the course of the work, the technological problems of the formation of out-of-plane microelectromechanical structures with the use of surface micromachining were studied. Internal stresses were controlled by varying the pressure of the working gas during sputtering. The use of this method allowed forming the arcuate profile of the Cr-Cu-Cr film structure.
Analysis of doping distribution in horizontal GaAs nanowires with axial p-n junction by the conductive atomic force microscopy
Authors: Borodin B R , Alekseev P A , Dunaevskiy M S , Khayrudinov V , Lipsanen H 
Published: December 2019

Abstract
This work presents the results of an investigation of in plane horizontal GaAs nanowires by Scanning Probe Microscopy (SPM) methods. Topography and a local conductivity map of the horizontal nanowire with axial p-n junction are obtained. The distribution of doping and position of p-n junctions in nanowires are visualized. The I-V curves of differently doped parts of nanowires were measured. These data can be important for the understanding of the doping incorporation mechanism of GaAs nanowires.
Testing of Image Resolution Enhancement Techniques Using Bi-cubic Spatial Domain Interpolation
Authors: Bustomi M A 
Published: December 2019

Abstract
The technique for increasing digital image resolution from low-resolution image to high-resolution image based on digital image processing is called the super-resolution technique. In this paper, a super-resolution technique is presented using a two-dimensional bi-cubic interpolation method in the spatial domain. The order of the super resolution method applied is as follows: (1) selecting ten images as samples, (2) decrease the sample image resolution to one-fourth of the original resolution by deleting three quarters of the pixel number, (3) increasing the image resolution of a quarter of the part becomes like the initial resolution using bi-cubic interpolation for three quarters of the additional new pixels, (4) testing this bi-cubic interpolated image with the same pixel-sized initial image, (5) using parameters: average value, minimum value, maximum value and standard deviation value as a comparison parameter between bi-cubic interpolated images and the same pixel-sized initial image. The results obtained from the super-resolution technique using spatial bi-cubic interpolation are: (1) The average error value of the bi-cubic interpolation method in image objects in this study is between 4% to 10% or still quite low, (2) Bi-cubic interpolation methods can work well on square pixel-sized images (m = n) compared to non-square pixel-sized images, (3) Bi-cubic interpolation turns out to produce an array of image pixel values that mirror symmetry against the main diagonal lines of the image before being interpolated.
The recent advances on potential solid electrolytes for all-solid-state supercapacitors: A short review
Authors: Ainiya Lisda 
Published: December 2019

AbstractThe increasing demand to develop renewable energy has increased drastically due to limited resources and environmental problems of fossil fuel. The most widely used energy storage devices are batteries and capacitors. Supercapacitors, on the other hand, can induced higher power density by fast charging/discharging rate which results in higher power density and longer cycle life compared to batteries and fuel cells. To fulfil the demand for safer energy sources, the use of highly flammable organic liquid electrolytes and polymer separators must be replaced by solid electrolytes. Therefore, supercapacitors with solid electrolytes can be alternative renewable energy. Commercially, there are three types of electrolytes of supercapacitors: aqueous electrolytes, organic electrolytes, and ionic liquids. In this paper, there is selective review on solid electrolytes of supercapacitors including chitosan, polyacrylamide, poly(aryl ether ketone), and polyethylene glycol. Overall, this paper aims to provide comprehensive reviews on recent advances in potential solid electrolytes of supercapacitors and the remaining challenges.
Mercury and Cyanide Pollution on the Aquatic Organism in Sekotong People Gold Mining
Authors: Suhadi  , Sueb  , Syamsussabri M 
Published: December 2019

AbstractThis study aimed to determine the pollution of mercury and cyanide in gold mining conducted by Sekotong people. Samples of this research were water and the aquatic organism around in people gold mining consisting ofAcetes indicus, Perna viridis, Polymesoda expansa, Plotosus canius, Scylla serrata, Tegillarca granosa, Moolgarda seheli,andCrassostrea gigas.The content of mercury in the samples can be known using Atomic Absorption Spectrophotometry (ASS). In the same way, in order to know the content of cyanide in the samples can be obtained using Ultraviolet-Visible (UV-Vis) Spectrophotometry. The results showed that Sekotong people’s gold mining has been contaminated with mercury and cyanide in aquatic and animal environments exceeding the specified threshold value with the highest level of mercury 48.91 ppm and cyanide 90.22 ppm.
The effectiveness of nutrient variation to hydroponic Caisim (Brassica juncea L.) growth
Authors: Dewi S K , Rahayu Y S , Bashri dan A 
Published: December 2019

AbstractOne type of vegetable that is popular among the Indonesian is mustard greens(Brassica junceaL.), which is also known asCaisimbecause it is often processed into various dishes and contains various ingredients and vitamins which are good for health. The last few yearsCaisimproduction has decreased, one of the causes is the constraints in the cultivation process, especially in the use of fertilizers due to the relatively long-term use of inorganic fertilizers. To improve the cultivation ofCaisimwithout looking at the soil conditions, we can use a hydroponic system. However, hydroponics need more cost because the AB MIX nutrition is still relatively expensive, so it needs an alternative nutrient as a substitute for AB MIX which has the same ability. AB Mix is a mixture of fertilizer A and fertilizer B. Fertilizer A contains potassium while fertilizer B contains sulfate and phosphate. An alternative nutrient as a substitute for AB MIX which has the same ability, such as liquid fertilizer based on local microorganisms (LMO) which has properties that are easily absorbed by plants so that the use of organic nutrients can be used as a source of substitute nutrition, which is more economically affordable and has a very good influence onCaisimand is expected to increase production inCaisimcultivation. This study used a Completely Randomized Design with a single factor experimental design consisting of 4 treatments, namely a combination of AB MIX solution and various kinds of LMO-based organic nutrients as follows: A = LMO A 5 ml + AB MIX 5 mL/L of water; B = LMO B 5 mL + AB MIX 5 mL/L water; C = LMO A 5 mL + MOL B 5 mL/Liter water; D = AB MIX 10 mL/L water. The variables observed were plant height, number of leaves, and biomass ofCaisim.The results showed that the variation of AB MIX nutrition and liquid organic fertilizer based on LMO effectively increased the growth ofCaisimplants. The highest average plant height was given byCaisimwith AB MIX nutrition, which is 69.2 cm. The highest average number of leaves was obtained byCaisimwhich was grown with a combination of LMO A and LMO B nutrients, which was 27.8. The largest average wet weight was given byCaisimwith AB MIX nutrition, which is 32.3 g. According to the three parameters, the use of ab mix nutrients is 10 mL / L water and a combination of LMO A 5 mL + LMO B 5 mL / L water is the most effective combination of nutrients for hydroponicCaisimgrowth.
Mathematical Representation of Middle School Students in Solving Fractional Problems Based on Sex Difference
Authors: Fadhilah N , Budiarto M T , Rahaju E B 
Published: December 2019

Abstract
Mathematics is one of the subjects taught in schools from elementary education to higher education, in which mathematics cannot be separated from the problem-solving activities. This is because the problem-solving activities is one of the most important skills taught to students early, as a preparation to face problems in the future. Fraction is one material that has a relatively difficult and challenging concept for students. This study aims to describe the students’ representation of middle school in solving fractional problems based on sex difference used Polya rules. This research is an exploratory research with a qualitative approach that produces descriptive data. This research was conducted on 7th grade students of SMP Negeri 53 Surabaya. Written data was taken from the results of the written test which produced two research subjects. They are one male student and one female student who have a similar mathematical ability. Data collection method used are the test method by giving the task of mathematics and method of interview. The results of the research showed that the mathematical representation of male junior high school students in solving fractions is by presenting the data provided using symbol manipulation and given verbal information with written words or sentences. While the mathematical representation of female junior high school students in solving fraction questions uses more verbal forms or written sentences as explanatory illustrations. So the representation ability of students can be used as a reference to determine the extent to which a student understands a problem at hand.
Students’ Strategies to Solve Reversible Problems of Function: The Part of Reversible Thinking
Authors: Maf’ulah S , Juniati D 
Published: December 2019

Abstract
This study aimed to reveal students’ strategies to solve reversible problems, particularly to function course. Individuals’ competence to solve reversible problems is the part of reversible thinking. This way of thinking refers to a reversible two-way relationship. Providing reversible problems is a way for teachers to develop their students’ reversible thinking. It was qualitative. 105 students who were prospective teachers of mathematics were selected as the subject of this study, and it took a test containing some reversible problems, such as function along with its graphic and between derivative and integral, as the instrument. The students’ results were further analyzed to reveal their strategies of solving those reversible problems. The finding showed that among 105 students, 62% of them were capable to draw the graph of an identified function through 4 different strategies, while 28% of them were capable to define the function of an identified graphic through 5 different strategies. The significant difference between those two percentages implied that only few students were capable to both drawing the graphic of an identified function and defining the function of an identified graphic. Overall, it indicated that the students were still less in constructing a reversible relationship between function and its graphic.
Student’s Geometric Thinking in Understanding Volume with Three-Dimensional Images of Cubes and Nets
Authors: Setiawati H , Juniati D , Khabibah S 
Published: December 2019

Abstract
This study aimed at describing the thinking skills of junior high school students in solving problems about the volume of cube and cuboid presented in the form of images of nets and solid figure geometry. This research was a descriptive study with a qualitative approach. This research was conducted at eighth grade class in Islamic Junior High School (MTs) Nurul Huda, Sidoarjo, Indonesia. The research subjects were two students, male and female in the same class of seven classes. The instruments used in this study were geometry test and interview. Geometry test was designed to determine student’s thinking in understanding volume with three-dimensional images of cubes and nets. Interview was used to make the researcher easier to explore how the students completed the given geometry test on the problem of the volume of cube and cuboid. Student’s thinking ability was explained based on three abilities according to Sternberg. The results showed that the female student had analytic and creative abilities in understanding images for the volume of cube and cuboid, but the male student tended to be more thoughtful towards abstract concepts. For practical ability, the male student had practical ability better than the female student.
Proving the Pythagorean Theorem to Junior High School students through the Asian method
Authors: Wijayanti P , Hidayanti A N 
Published: December 2019

Abstract
The development of right triangle concept has been known since ancient Egypt and is still be used in daily life until now. One of the most popular theorems that relate to the right triangle is Pythagorean Theorem. In its development, the Pythagorean Theorem has been proven by mathematicians with different methods. Based on historical developments there are approximately 200 proofs of the Pythagorean Theorem that has been found. Nevertheless, history still has interesting mysteries to study especially for the development of the Pythagorean Theorem in Asia. In student textbooks, the proof of Pythagorean Theorem introduction often comes from the European continent such as proof by Pythagoras, Euclid, and Leonardo Da Vinci. This caused Pythagorean Theorem’ development in Asia as if it were excluded, the proof of Pythagorean Theorem in Asia also developed by mathematicians such as Bhaskara and Zhao Shang with different names. Even so, the discussion of those Pythagorean Theorem proof can be introduced to students as an initial concept in Pythagorean Theorem chapter and presented pleasantly in the form of mathematics historical comic to make it more attractive. The discussion result in this journal is also in line with the 2013 curriculum which emphasizes student activity and fun learning model.
Mathematical Problem Proving and Problem Posing
Authors: Siswono T Y E , Hartono S , Kohar A W 
Published: December 2019

Abstract
This article describes students’ tasks that concerned to assess students’ problem proving and problem posing on triangle tasks. This descriptive-explorative research involves 24 prospective mathematics teachers at a state university in Surabaya, Indonesia. They had to answer three questions. The first question related to problem proving of triangle theorem. The second question related to their perception of the first question, and the last question related to the problem-posing task. A Newman analysis is used to analyse the data. The analysis of the data focused on students’ problem proving and students’ problem posing of triangle task. The results showed that most of them were correct to answer the question as many as 41%. It can be seen of the first question was performed by the highest number of them. However, some of them still have a perception of the first question is a problem, because it shows as many as 95% of 24 students choose it. They also have some weaknesses in proving problems, mainly misinformation or ambiguity about the problem, it is not a category as a problem proving. They constructed proof by formal proof with a low level of problem difficulty as many as only 38 % of them.
An Effort in Teaching Invertebrates and Training Digital Literacy to the Students
Authors: Putri I D T , Ambarwati R 
Published: December 2019

Abstract
Digital literacy is an ability to understand and use information in multiple formats and sources while presented through computers. The research purposes have analysed the influence of the electronic Invertebrate book on students’ digital literacy and learning outcomes, as well as describe student responses upon learning process using electronic Invertebrate book. This research used mixed-method. The research samples selected using purposive sampling. Student’s digital literacy and learning outcomes, in the form of pre-test and post-test, were analysed quantitively using normalised gain scores (g). The difference between pre-test and post-test in treatment or control class calculated using Wilcoxon test. Meanwhile, the post-test score and normalised gain score between treatment and control class calculated using Mann-Whitney test. The student’s responses through the learning process were analysed descriptive-quantitatively using questionnaire. The result revealed that about 57% of students completed the digital literacy test and 100% of them enhanced in the category of medium to high on digital literacy skills.
The Effect of Environmental Pollution Module on Environmental Worldview in Senior High School
Authors: Syamsussabri M , Suhadi  , Sueb  
Published: December 2019

Abstract
This study aimed to know the effect of environmental pollution module on the environmental worldview in senior high school. This type of research is quasi-experiment. The research instrument was a scale of the New Ecological Paradigm (NEP). This research conducted at SMAN 1 Lembar. The research subjects were 54 students of class XI Mathematics and Natural Science. Samples were taken by cluster sampling with the equality test. The analysis of data used One-way Analysis of Covariance (ANCOVA). The results showed there was the effect of the environmental pollution module on the environmental worldview in senior high school with p-value < .005.
Learning Management System with Moodle to Enhance Creativity of Candidate Physics Teacher
Authors: Gunawan G , Sahidu H , Susilawati S , Harjono A , Herayanti L 
Published: December 2019

Abstract
Creativity is one of the main goals of education. Debriefing creativity is essential to win in global competition. Practicing creativity can be done by utilizing the development of information and communication technology, including learning physics for candidate teachers. One innovation that can be done to improve the quality of creativity-oriented learning is to develop a learning management system (LMS) with Moodle. The aim of this research is to produce a learning management system with Moodle that can enhance the creativity of candidate physics teachers. However, the focus of this article is to explain the results of trials of the effectiveness of products that have been developed to increase the creativity of candidate physics teachers. This research is a research development that adopts ADDIE research design (analysis, design, develop, implementation, and evaluate). The research instrument used to measure candidate physics teacher creativity is a creativity test consisting of 80 questions and consists of various types of tests both multiple-choice, short answers, and essays, which have been developed according to creativity indicators. To find out the increase in student creativity, data were analysed using the n-gain test. The results of the study show that the model develops successfully trained the creativity of candidate teachers, including verbal, figural, numerical, and procedural aspects. This model allows lecturers to manage learning and exchange information with students quickly and flexibly.
Practicality and effectiveness of SETS based learning materials to trained students’ higher-order thinking skills
Authors: Hasanah A F , Raharjo  , Rachmadiarti F 
Published: December 2019

Abstract
At present, there are no many environment-based learning activities with interesting practices that utilize technology and at the same time to train students with higher-order thinking skills. Therefore, a learning instrument is needed to implements these practices. This research aims to describe the practicality and effectiveness of SETS based learning materials for higher-level thinking skills of 1st grader of junior high school in Sciences subject, including (1) describing the implementation of learning, (2) describing student responses toward learning, and (3) describing higher-order thinking skills of students. Research methods used were observation method for learning realization, questionnaire method for student responses, and test method to determine learning achievement (pre-test and post-test). Research instruments used were observation sheets of learning realization, questionnaire sheet for student response, and sheets of the higher-order thinking skills test. Results of the research showed that (1) learning based on the SETS approach was conducted very well; (2) student responses toward learning are highly positive; and (3) higher-order thinking skills of students have increased after SETS-based learning materials have been applied. This is shows that SETS learning materials are stated to be practical and effective to be used in learning to trained higher-order thinking skills.
The Effectiveness of Guided Inquiry Learning Model to Improve Science Process Skill on Heat Matter
Authors: Yunianti A U , Wasis  , Nur M 
Published: December 2019

Abstract
This research aimed to describe the effectiveness of guided inquiry learning model to trained science process skill. Research conducted in SMA Kemala Bhayangkari 1 Surabaya at grade XI on heat matter by using one group pre-test and post-test design. Data collecting techniques consist of tests and questionnaires. The effectiveness of the guided inquiry model is obtained based on the science process skill test, learning achievement of knowledge test and student responses. Science process skill test and learning achievement of knowledge test obtained based on the results of the pre-test and post-test. Student responses are obtained based on the results of the questionnaire that includes the student responses to learning. The data analysis using n-gain score to determine the improvement of science process skill and learning achievement of knowledge while descriptive quantitative to describe student’s response. Result of this research shows that (1) indicators of science process skill improved with high category (2) learning achievement of knowledge improved with middle category (3) student responses to learning are highly positive. Based on those results indicates that guided inquiry model is effective to improve science process skill on heat matter.