bluuebunny/crossref_metadata_2025_split huggingface dataset:
Aviation kerosene sensors based on nanocrystalline SnO2 thin films with various catalysts
Authors: Kushnarev B O , Maksimova N K , Khludkova L S , Chernikov E V , Sevastyanov E Y 
Published: December 2019

Abstract
Gas-sensitive characteristics of aviation kerosene sensors based on nanocrystalline SnO2 thin films with various catalysts have been studied as a function of the operating temperature and gas concentration in the air. Thin tin dioxide films were grown in magnetron by sputtering of a tin–antimony alloy target in oxygen–argon plasma. It is shown that the sensors are characterized by a high sensitivity to aviation kerosene vapors and by a good stability of parameters during long-term tests and under the variation of humidity.
Formation of Gibbs and Langmuir floating layers based on copper nanoparticles: temperature and concentration effects
Authors: Begletsova N N , Baimagambetova L T , Mironyuk V N , Smirnova A I , Venig S B , Usol ’tseva N V , Glukhovskoy E G 
Published: December 2019

Abstract
This paper is devoted to study of the formation of Gibbs floating layers from aqueous solutions of copper nanoparticles (Cu NPs) stabilized by the sodium dodecyl sulfate surfactant. Langmuir floating layers of arachidic acid formed on the surface of a water subphase containing Cu NPs were also studied. Adsorption of copper nanoparticles on a monolayer of arachidic acid at different conditions has been investigated. In the experiments the amount of copper nanoparticles in the subphase and the temperature of the subphase were changed. The performed analysis showed that the increase of subphase temperature from 29 to 42 °C leads to the increase of the area occupied by Langmuir floating layers in a liquid-condensed state by 30 and 32 %, respectively. After a single transfer of the floating layer onto the highly oriented pyrolytic graphite substrates, their surface microrelief was investigated by atomic force microscopy (AFM). The AFM scans showed that the obtained copper nanoparticles films contained separate areas with copper particles and their aggregates. With an increase of surface pressure from 10 to 40 mN/m, an increase of the height difference of the surface microrelief from 4 to 7 nm and an increase of the large aggregates number with lateral dimensions about 100 nm were observed.
Influence of annealing temperature and activation time on the catalytic centers formation for carbon nanostructures growth
Authors: Il’in O I , Rudyk N N , Il’ina M V , Osotova O I , Fedotov A A 
Published: December 2019

Abstract
Experimental studies of the effect of annealing temperature and time of the PECVD process activation stage on the formation of catalytic growth centers of carbon nanostructures were carried out. The dependences of the diameter and height of the catalytic centers on the annealing temperature are obtained. It has been established that exposure in an ammonia atmosphere leads to additional etching of nickel and a decrease in their diameter and height. It has been established that the most optimal temperature for creating with the smallest dispersion of the geometric parameters of the catalytic centers is 750 °C.
Self-organization of nanocarbon particles in the flame by a heterophase mechanism
Authors: Vasilyeva O V , Ksenofontov S I , Kokshina A V 
Published: December 2019

Abstract
Nanotubes of different structure are formed during the self-organization of nanocarbon particles in the flame. The nucleation and growth of these tubes occurs by a heterophase mechanism. Self-organized structures by size “fill” the space between nano-and micro-formations.
Selection of the design of a hot heat exchanger of an automotive thermoelectric generator for an urban driving cycle
Authors: Shishov K A 
Published: December 2019

Abstract
It is considered for combustion engines to have nearly 60-70% of fuel energy to be dissipated to the environment by the exhaust gases. Automobile thermoelectric generator (ATEG) application is proved to be a solution for increasing vehicle fuel economy by exhaust gas waste heat recovery. The overall efficiency of ATEG system highly depends on its hot heat exchanger, which is designed to remove heat from the exhaust gases to thermoelectric modules that generate electricity. Intensification of heat transfer in ATEG prototypes is usually achieved by using finning and tabulators. However, the modification of inner side of hot heat exchanger increases the hydraulic resistance of the exhaust system, which adversely affects the power and efficiency of the engine. In this work, we investigate the designs of hot heat exchangers with different configurations of the inner surface and evaluate their impact on the engine power during the modern urban driving cycle.
The conductivity and the diamagnetic response of the graphene-like carbon films in the 80 – 120 K temperature range
Authors: Kovalchuk A A , Prikhodko A V 
Published: December 2019

Abstract
The paper presents the results of conductivity and diamagnetic response studies in natural carbon films in the temperature range 77–220 K. The behavior of the current-voltage characteristic of carbon films containing graphene-like fragments was studied by nanosecond voltammetry. It is established that when the critical temperature is reached, the sample resistance increases sharply with the simultaneous disappearance of diamagnetism. Was proposed possible mechanism of high-temperature superconductivity based on synchronization of negative-U centres presumably exists in the carbon structure under study.
Strength and structural properties of AlN films grown on SiC/Si substrates synthesized by atomic substitution
Authors: Grashchenko A.S. , Kukushkin S.A. , Osipov A.V. 
Published: December 2019

Abstract
In the present work, we studied the strength and structural characteristics of the layers of the AlN/SiC/Si heterostructure. The surface morphology of the AlN film and the SiC/Si substrate was studied using atomic force microscopy. The thickness of the AlN and SiC layers was determined by analyzing the data of ellipsometry. The hardness of the films and the substrate was measured by the method of nanoscratch testing. It was experimentally shown that the films under study have a high crystalline quality.
Rainfall Prediction in East Java Using Spatial Extreme Value Theory
Authors: Artha A A , Sofro A 
Published: December 2019

Abstract
Extreme rainfall is a phenomenon that occurs because of the high intensity of rainfall which causes many negative impacts. For example, is flooding that can ruin crops for farmers. To minimize this hazard, rainfall prediction is carried out. One methods that can be used is spatial extreme value theory using max stable approach and copula approach. From it, we will get the return level (predictive value) rainfall by paying attention to the location elements in it. This study discusses the max-stable approach using the Smith model and the copula approach using the Copula Gaussian model. Parameter estimation used is Maximum Likelihood Estimation (MLE) method. Because it takes into spatial elements, the trend surface model is also used. At the end of the study, Akaike Information Criterion (AIC) is used to compare and select the best model that can be used in predicting rainfall. Spatial extreme value theory will be applied to rainfall data in East Java which consists of nine rainfall observation stations. The results of spatial parameter estimation show that the highest of rainfall intensity value will occur around rainfall observation station namely Sawahan which is located in Nganjuk district in a period of two years. From AIC, it can be said that the model using copula Gaussian is the best model compare with max-stable approach as it provides the smallest AIC values.
Two-Level Handling Model of Tuberculosis
Authors: Fuad Yusuf , Maulana Dimas , Astuti Yuliani Puji 
Published: December 2019

Abstract
Tuberculosis (TB) is an infectious disease caused by the Mycobacterium tuberculosis which most commonly attacks the lungs. In 2017, ten million people contracted TB and 1.6 million people died of TB. It is estimated that one million children suffering from TB and 230,000 children die due to TB, including children who die both TB and HIV. Global estimation show that there are ten million TB cases which are equivalent to 133 cases per hundred thousand population numbers, the country with the highest case is India by 27%, China by 9% and Indonesia by 8%. Some research related to the mathematical model of the spread of TB, for example the S-E-I/L model by Soyoung, the S-L-I/J-T model by Zhang, and the S-L-I-T model by Trauer. In this research proposal we will reconstruct a two-level model of the spread of tuberculosis infection, which means that this tuberculosis infection attacks two populations simultaneously, namely adult and individual children. The model used is the S-E-I-R/S-E-I-R model. The first individual who is attacked, in this case is an adult individual, then infects the individual child. Later, we obtain the disease free equilibrium which is

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Analysis between GPA and TOEFL Score For Postgraduate Student of Sports Education using Bivariate Logistic Regression
Authors: Sofro A , Oktaviarina A , Mintarto E , Wiriawan O 
Published: December 2019

Abstract
Due to the globalization era, there is the challenge of competition in all fields including finding work in sports education. To meet the stakeholder’s needs, it is necessary to have some criteria for prospective workers and also a well-planned process in academic. Grade Point Average (GPA), is one of the most important achievements during the postgraduate programme. Meanwhile, another academic component is English as a Foreign Language Test Score (TOEFL) which also has a very significant impact on seeing the job.
This paper will analyze valuable factors that influence GPA and TOEFL using a bivariate approach. In this case, the GPA will be defined as two levels, i.e low and high. TOEFL is also able to define as two categories, i.e more and less than 450. Hence, bivariate logistic regression is the most appropriate approach. The result shows that the coefficient of age has strong evidence to reject the null hypothesis at a significant level of 0.05. It means that the variable of age has a huge contribution to influence the score of the TOEFL for the postgraduate programme in sports education.
Metrics on a G-metric Space
Authors: Jakfar Muhammad , Manuharawati  , Yunianti Dwi Nur , Kumala Mey Dita 
Published: December 2019

Abstract
Given a G-metric space, we offer a simple way to derived metrics from G-metric and realize that any G-metric space is a metric space. We also show that, in certain cases, the metric can be derived from G-metric in such a way that the convergence and completeness in the G-metric is equivalent to those in the derived metric.
Parameter Estimation Using INLA for Disease Mapping of Leptospirosis in Bantul Indonesia
Authors: Artiono R 
Published: December 2019

Abstract
Agriculture sector is recognized as one important factor for an increased risk of leptospirosis in Bantul, Indonesia. From January to July 2010, there were 70 patients of leptospirosis with 43 patients engaged in agriculture. The aim of this study was to determine the impact of agricultural sector on the disease mapping of leptospirosis in district level. A structured additive regression model was used for statistical analysis associated with agricultural area and agricultural livelihood. In addition, a random effect that captures the spatial heterogeneity in the study region was also included in this study. Model estimation and predictive inference was carried out through the implementation of computer code in the R-INLA package, which makes use of the Integrated Nested Laplace Approximation.
Students’ reflective abstraction of middle school in reconstructing quadratic equation concept based on high mathematical ability
Authors: Cahyani L , Masriyah  , Budi Rahaju E 
Published: December 2019

Abstract
A quadratic equation is one of the mathematics concepts that must be learned in secondary school. Students have many difficulties in solving quadratic equations. One of them is experiencing a process skill error. Students need new abstractions and processes to shape experiences to distinguish whether experience falls into student abstraction or beyond student abstraction. Reflective abstraction is students’ understanding of mathematics through problems that reflect and reconstruct mental structures, then the scheme is used to solve problems. The reflective abstraction mechanism that can be applied to metal structures is the APOS theory, namely: Actions, Processes, Objects, and Schemes to construct new mental structures. The process of mental reconstruction of each student is different, so for the formation of mathematical concepts, it needs mathematical abilities. In other words, if someone has good mental reconstruction abilities, hopefully, his concept formation is also good. This research conducted using a qualitative approach. The subject of this research was selected from grade 9 junior high school students in Surabaya. Students must answer two tests, namely tests of mathematical abilities and reflective abstraction tests. Analysis and categorization of scores were carried out on both tests. Then two students who has high mathematical ability was selected as subject. Semi-structured interviews is conducted individually for each subject. The purpose of this study is to find out the reflective abstraction of students that have reconstructing concept of quadratic equations in terms of high mathematical ability. The results of the study indicate that the subject can solve the problem according to the stages of the APOS.
Generalization Pattern’s Strategy of Junior High School students based on Gender
Authors: Firdaus A M , Juniati D , Wijayanti P 
Published: December 2019

Abstract
This study aims to describe the Generalisation Patterns Strategy of junior high school students based on gender. The subject of this study is two junior high school students in Makassar City, one male, and one female. Data collection techniques are written tests and interviews which used to obtain data about the strategy of the generalization patterns of students. The validity used time triangulation. The analysis data consists of three stages: reducing data, presenting data, and daring conclusions. The results of this study show that the male subject used the strategy of Counting, Whole-object-No Adjustment, and Difference-Rate Adjustment. Meanwhile, the female subject used the strategy of Countin and Explicit in the generalization of patterns on numbers and pictures.
Mathematical Connection Middle-School Students 8th in Realistic Mathematics Education
Authors: Hasbi M , Lukito A , Sulaiman R 
Published: December 2019

Abstract
This study was conducted to notice the effect realistic mathematics education in improving 8th grade Middle-School students’ mathematical connection by employing measuring tools of a mathematical connection test and observation sheet, which were developed, was distributed to 37 experimental group students and 37 control group students, which makes 74 learners in total. This study was accompanied experimental by pre-test – post-test control group design. This participant was studying at 8.5th grade as the experimental group and 8.6th grade as the control group from a Middle-School 2 Candi Sidoarjo. Realistic Mathematics Education was implemented in the experimental group while the Control group was implemented to the current Curriculum. As a result of the conducted experimental group, it was being discovered that mathematical connection tests and observation sheets of experimental group students are better than control group students. It was be discovered too, based on the results of the mathematical connection test, 83.78% of students obtained N-Gain more than or equal to 0.7. Therefore, it is possible to say that realistic mathematics education is more efficient than learning in the control group.
Analysis of Mathematical Literacy on Students’ Metacognition in Conic Section Material
Authors: Salsabila E , Rahayu W , Kharis S A , Putri A 
Published: December 2019

Abstract
Mathematical literacy is one of the components that use mathematical concepts and applies them to an everyday situation. Mathematical literacy helps people to identify and understand the role that mathematics plays in the world, and to make the well-founded judgments and decisions required in life by constructive, engaged, and reflective citizens. By contrast, not everybody acquires sufficiently. This study aims to describe the ability of mathematical literacy especially geometry literacy in terms of student metacognition on conic section material. The problems in this study were: 1) How is the ability of mathematical literacy in terms of student metacognition on conic section material 2) What types of mistakes do students make in solving the problem of cone section and 3) What factors cause students to make mistakes in solving conic section question. This research is a qualitative descriptive study. The subjects in this study were 36 mathematics education students who took courses in Analytical Geometry. The data collected using observation, written test, and interview. Before the researcher conducted the analysis, the researcher examined the validity of the data using validity and reliability tests in order to obtain valid data. Furthermore, the valid data were analysed descriptively through identification, grouping, clarification, explanation and conclusion.
Number sequence as a context for creating a mathematical problem
Authors: Prihartiwi N R , Siswono T Y E , Kohar A W , Hartono S , Hidayat D 
Published: December 2019

Abstract
Creating a problem is one cognitive process of Bloom’s taxonomy. By making a problem and the answer on their own, causes students to understand more complex context problems. Applying number sequence challenges students to apply higher-order thinking skills and emphasize exploration, investigation, conjecture, and generalization. From the previous explanation, the purpose of this study is to explore the ability of students in creating mathematical problems in the context of numbers based on the ‘degree of reality’ and based on innovation on mathematics problems. This descriptive explorative study is collected from 24 prospective mathematics teachers that consist of 4 males and 20 females in a university. All students have to answer one question about creating word problems related to number sequence and the answer. Those problems then were analyzed and categorized based on the modification of innovation on mathematics problems by Vistro-Yu and based on ‘degree of reality’ by de Lange. The result of this study, modification is the most emerging technique among all, and the least are addition and replacement. Based on ‘degree of reality,’ only one-fourth of the number of students successful in creating a camouflage context. This result leads to only forth of the number of students successful in creating word problems. The implication of this study is the choice of students in making questions at least provides an overview of the highest level of difficulty, according to students. In mathematics learning, the lecturer should plan assessments and evaluations that need to be developed to build students’ abilities to make mathematics as a whole by connecting subjects in mathematics and to make mathematics more relevant to reality.
The Effectiveness of Learning Materials of Inquiry Models to Practice Science Process Skills in Simple Harmonic Motion’s Matter
Authors: Sholikhah M , Prastowo T , Prabowo  
Published: December 2019

Abstract
This research aims to know the effectiveness of learning materials of inquiry learning models to practicing science process skills in simple harmonic motion’s matter. This research was conducted on 60 tenth grade students at Muhammadiyah 1 Gresik Senior High School. The effectiveness of this research is seen from science process skills tests, learning achievement, and student response. Science process skills data were obtained from pre-test and post-test. Learning outcomes data were obtained from affective and psychomotor assessment through observation methods and cognitive assessment through the post-test method. While student response data were obtained from the questionnaire method. N-Gain values were obtained from average to high range for each class from the results of pre-test and post-test, this showed the increase in process skills of students. The data analysis of learning achievement indicated that all students have final results that meet the minimum completeness criteria (>75). The data analysis of student responses showed positive results, the highest positive response was the use of student worksheets (LKS) that eases students in learning. Thus, based on the results obtained it can be concluded that this research learning instrument is effective for practice the science process skills in simple harmonic motion’s matter.
Development of Guided Inductive Inquiry Learning Support Materials Prototype on Energy for Junior High School Level to Improve Students’ Conceptual Understanding: Validity and Practicality Study
Authors: Mahdiannur M A 
Published: December 2019

Abstract
This research purposed to describe the quality of learning support material prototype in energy topics for Junior High School. The quality-focused on this research were (1) validity and (2) practicality aspects. Guided inductive inquiry (GII) is a learning model to facilitate students to have a comprehensive understanding of concepts, develop complex thinking skills, and help internalize the concept of evidence and substantive concepts within students that they can use to solve problems, develop competencies, and improve learning outcomes. This research used Mafumiko’s Model to develop a prototype of learning support materials based on design research. This study conducted at SMPN 1 Tanah Grogot, Paser Regency, East Kalimantan, and involved 3 (three) subject matter experts (SMEs) and 2 (two) observers during the classroom tryout. The SMEs examined the GII learning support materials valid and their appraisal reliable. The implementation of GII learning support materials during learning processes in the very good category and students’ activities reflected the level of active participation. Based on these results, the quality of the prototype of GII learning support materials on energy topics for Junior High School level met the validity and practicality criteria and also improved the students’ conceptual understanding.
Analysis and empirical research about the satisfaction related factors of business administration specialty practice teaching in Chinese Medicine Universities
Authors: Cheng Xiao , Guan Cuiling , Pan Xiaoyi , Wang Yongjian 
Published: December 2019

Abstract
To study the effects of pre-control, central control and post-test management programs on student satisfaction in management practice teaching in TCM University, 57 students in the experimental class of medical marketing were investigated by test tools like questionnaire and self-made satisfaction scale. There is no statistical difference in student satisfaction (P>0.05), no statistical difference in the sense of knowledge (P>0.05). There are statistical differences in the understanding of content, and understanding is higher than unknown satisfaction (P< 0.05). There are statistical differences in the number of preparatory projects before the internship. The more preparatory projects, the higher the satisfaction (P<0.05). There are statistical differences in the number of internship questions. The more preparatory questions, the higher the satisfaction (P<0.05). Quality and satisfaction of enterprise lecturers were correlated (P<0.05). The factors that affect the satisfaction of practice activities of management practice in Chinese medicine colleges include the content of pre-internship, the number of projects and questions for preparation, and the quality of enterprise lecturers.