bluuebunny/crossref_metadata_2025_split huggingface dataset:
Contribution of teacher’s teaching skills and students’ intrapersonal intelligence toward metacognitive awareness of students in state vocational school in Blitar
Authors: Maryati T , Khasanah S U , Maf’ula V Y 
Published: March 2020

Abstract
Vocational High School graduates who can study independently will become lifelong learners who are responsive to change so they can compete in the workforce of the revolutionary era 4.0. But the learning process at Vocational High School is still not paying attention to the development of high-level thinking skills of students. This is in line with the opinion of Mukhadis that the implementation of learning in the field of technology is still less encouraging which has an impact on the lack of development of individual abilities to develop high-level thinking skills, namely metacognition. Metacognitive awareness of Vocational students is still not suspected because of several aspects, that is internal and external aspects. Internal aspects are factors that influence students from themselves, one of them is intrapersonal intelligence. Then the external aspect is a factor that influences from outside the student’s teaching skills. Given the importance of this metacognitive awareness, the authors conducted a study on the contribution of teacher teaching skills, intrapersonal intelligence to the metacognitive awareness of vocational students in computer network engineering study program in Blitar City. This study aims to determine how much the contribution of teacher teaching skills and intrapersonal intelligence of students to the metacognitive awareness of vocational students in computer engineering and network expertise packages in Blitar City. The type and analysis of data in this study are included in quantitative research. The number of samples used was 57 students in class X. Data collection techniques for variable teaching skills, intrapersonal intelligence and metacognitive awareness using questionnaires. Data analysis includes description and multiple regression.The results show as follows that, there is no significant contribution to partial teaching skills to the metacognitive consciousness; there is a significant contribution to the contribution of students’ intrapersonal intelligence partially towards the students’ metacognitive awareness of 44.22% and there is also a significant contributions to teacher teaching skills and intrapersonal intelligence of students to the students’ metacognitive awareness of 52.8%.
Design research on calculus: Students’ journey in learning definition of definite integral
Authors: Tasman F , Suherman  , Ahmad D 
Published: March 2020

Abstract
Some researchers report that students find difficulties in learning definition of definite integration. Therefore, classroom activities designed with design research method to help university students gain better understanding on this topic. In order to support students, realistic mathematics approach was chosen. Series of instructional activities had been designed to reach mathematical goal. Thirty of first year university students in Universitas Negeri Padang were chosen to implement the classroom activities that have been designed. This paper will report students’ journey in learning definition of definite integral in our local instructional theory (LIT). The research shows that students understanding about area, function, inscribed/circumscribed polygon, limit play important role to understand the definition of definite integral. Students need to see those concepts as a unit which cannot be separated to understand the definition of definite integral in a designed classroom activity.
Overcoming the difficulty of understanding systems of linear equations through learning ethnomathematics
Authors: Widada Wahyu , Herawaty Dewi , Rahman Mohammad H , Yustika Dita , Gusvarini Elsa P , Falaq Dwi Anggoro Abdurrobbil 
Published: March 2020

Abstract
Middle school students have difficulty in understanding the system of linear equations. Ethnomathematics learning was one alternative to overcome it. The purpose of this study was to describe ethnomathematics learning techniques to overcome students’ difficulties in understanding systems of linear equations. This research was part of development research. This is part of student analysis. The subjects of this study were 38 junior high school students in the Kota Bengkulu. The application of ethnomathematics learning was given to the subject. The instrument of this study was the researchers themselves with interview guides and observation sheets. It was an interview about the ability of students to understand systems of linear equations. Data were analyzed qualitatively with fixed comparison techniques. The results of this study are the difficulty of students understanding the system of linear equations can be overcome through learning ethnomathematics. The horizontal mathematization used the culture of the fishermen of Bengkulu people “bundled fish, rice as small, relaxed”. This culture makes it easy for students to recall prerequisite concepts, making it easier for students to do interconnection between concepts. This makes it easy for students to achieve the principles of elimination, substitution and mixtures. The conclusion of this study is that learning ethnomatematics about Bengkulu fisherman culture can overcome the difficulties of students in understanding the system of linear equations.
The genetic decomposition of students about infinite series through the ethnomathematics of Bengkulu, Indonesia
Authors: Widada W , Efendi S , Herawaty D , Nugroho K U Z , Putri F R 
Published: March 2020

Abstract
The cognitive theory views individuals as active information processors, so that individuals were able to represent each information according to the level of knowledge they have. Student representation can be seen as its genetic decomposition. Ethnomathematics was a vehicle for unlimited series learning. The purpose of this study was to describe the genetical decomposition of students about infinite series through the Bengkulu ethnomathematics. This was the initial research from a series of development research. This stage we interviewed in depth 10 high school students in Bengkulu, Indonesia. The research instrument was the researchers themselves who were guided by interview guides about understanding concepts and the principle of infinite series. Interviews were conducted during and after Bengkulu’s ethnomathematics learning. Data were analyzed through fixed comparison techniques. The results of this study were found that students can coordinate two or more actions about convergence of sequences, but not for convergence of infinite series. Conversely, there were students who can describe a particular object about converging an infinite series but not coordinated with the processes that were built for converging sequences. Also, there were students who can coordinate the action-process related objects so that a schema of converging sequence was formed, but for infinite series only in the form of separate actions or processes. The conclusion of this study was the genetic decomposition of students in understanding the infinite series through ethnomathematics learning at the intermediate level (inter level). The student before ethnomathematics learning was at the lower level (intra and pre-intra levels).
The development of student’s worksheet use integrated model with character load at lower grade class
Authors: Amini Risda , Rusdinal  , Usmeldi  , Helsa Yullys 
Published: March 2020

Abstract
The result of preliminary study show that student worksheet use in Elementary School has not been optimal in helping students improve students’ knowledge, skills, and attitudes. Student worksheet cannot activate the student in learning. Therefore, worksheet use integrated model with character load was developed. The development research use a 4-D model which consists of four stages, namely define, design, develop, and assess. The research subject was a student worksheet. The respondents were teachers and first grade students at Elementary School in Padang, Indonesia. The research instruments were observation sheet, questionnaire, and learning outcomes test. The results showed that the validity of student worksheet using integrated model was categorized as valid. The practicality of teaching materials was include practical categories, based on teacher and student responses. The student worksheet was included effective categories based on student activities and learning outcomes. Student activities in learning include very high categories. Learning outcomes most students achieve minimum completeness criteria.
How should the teacher provide feedback and its follow-up in assessing mathematics learning?
Authors: Fakhrunisa F , Herman T 
Published: March 2020

Abstract
Assessment is one of the important things that can affect the learning process and results. During the assessment phase, teachers are required to be able to provide effective feedback and its follow-up in order to get student learning goal. This study aims to present the facts that related to how forms of feedback and follow-up carried out by mathematics teachers in a one of public high school in Cimahi, West Java. Qualitative descriptive research method is equipped with observation, interview and questionnaire used to collect the research data. Through the data collection technique, it was found that the feedback that teacher presented from the entire learning process and the assessment process was still very insufficient. Students only get information about the scores obtained from the assessment in the form of a written test. There is no descriptive feedback and appropriate follow-up that makes students still feel difficulties in implementing mathematics learning. At the end of this article, it is also presented a recommendation for providing effective feedback based on theoretical studies of the results on previous studies.
Developing chemical equilibrium practicum module based on guided inquiry to explore students’ abilities in designing experiments
Authors: Pamenang F D N , Harta J , Listyarini R V , Wijayanti L W , Ratri M C , Hapsari N D , Asy’ari M , Lee W 
Published: March 2020

Abstract
In welcoming chemistry learning that emphasizes the quality of students, the teacher’s role is very important. As a prospective chemistry teacher, students must be prepared critically, both in terms of mastery of teaching materials and the development of learning models that are implemented. One of the alternatives offered is guided inquiry-based learning, which aims to develop students’ abilities so that exploration can continue. This study aims to develop valid dan practical product of chemical equilibrium practicum module based on guided inquiry to be used by chemistry education students in the experiment, so that students are able to think critically and reflectively. This research is a design thinking through the framework of Empathize, Define, Ideate, Prototype, and Test (EDIPT), with chemistry education students. Supporting instruments of this research include consultation sheets, observation sheets, and student response questionnaires. Data analysis was conducted in quantitative descriptive. The results of the study show that the practicum module developed can help developing the flow of students’ thinking carefully, analyse practical needs, design varied practicum topics, and reflect on experience during designing and implementing experiments. The average of students responds well to the development of the practicum module.
Rising methane emissions from boreal lakes due to increasing ice-free days
Authors: Guo Mingyang , Zhuang Qianlai , Tan Zeli , Shurpali Narasinha , Juutinen Sari , Kortelainen Pirkko , Martikainen Pertti J 
Published: March 2020

Abstract
Lakes account for about 10% of the boreal landscape and are responsible for approximately 30% of biogenic methane emissions that have been found to increase under changing climate. However, the quantification of this climate-sensitive methane source is fraught with large uncertainty under warming climate conditions. Only a few studies have addressed the mechanism of climate impact on the increase of northern lake methane emissions. This study uses a large observational dataset of lake methane concentrations in Finland to constrain methane emissions with an extant process-based lake biogeochemical model. We found that the total current diffusive emission from Finnish lakes is 0.12 ± 0.03 Tg CH4 yr−1 and will increase by 26%–59% by the end of this century depending on different warming scenarios. We discover that while warming lake water and sediment temperature plays an important role, the climate impact on ice-on periods is a key indicator of future emissions. We conclude that these boreal lakes remain a significant methane source under the warming climate within this century.
Functional relations for elliptic polylogarithms
Authors: Broedel Johannes , Kaderli André 
Published: March 2020

Abstract
Numerous examples of functional relations for multiple polylogarithms are known. For elliptic polylogarithms, however, tools for the exploration of functional relations are available, but only very few relations are identified. Starting from an approach of Zagier and Gangl, which in turn is based on considerations about an elliptic version of the Bloch group, we explore functional relations between elliptic polylogarithms and link them to the relations which can be derived using the elliptic symbol formalism. The elliptic symbol formalism in turn allows for an alternative proof of the validity of the elliptic Bloch relation. While the five-term identity is the prime example of a functional identity for multiple polylogarithms and implies many dilogarithm identities, the situation in the elliptic setup is more involved: there is no simple elliptic analogue, but rather a whole class of elliptic identities.
RBF Neural Network Adaptive Robust Sliding Mode Control Method of Artillery Ammunition Transfer Arm
Authors: Cai Hangjun , Chen Longmiao 
Published: March 2020

Abstract
This paper presents a robust adaptive sliding mode control strategy using radial basis function (RBF) neural network for a kind of value controlled asymmetric cylinder electro-hydraulic servo system of an ammunition transfer arm in the presence of uncertain nonlinearity and parameter uncertainty. On the premise of setting the expected trajectory, using RBF neural networks to approximate unknown parameters, by setting appropriate neural network parameters and adaptive terms, the change trend of position parameter was estimated. The stability of close loop system is verified by the Lyapounov theory. Compared with the simulation results of PID control method and expected trajectory, RBF Neural Net sliding mode control method has smaller system tracking error, faster response and better tracking performance.
Study on the Performance of a New Type of Anionic-nonionic Surfactant
Authors: Ning Mengmeng , Zeng Zhiguo , Han Mingzhe , Xu Zhengdong , Zhang Bin , Wang Peng , Kong Weizhong , Jia Jiangfen , Liu Qilun 
Published: March 2020

Abstract
A series of new anionic-nonionic surfactants, biophenol polyoxyethylene ether carboxylate (BPPC), were synthesized using biophenol as raw material. The chemical structure of anionic-nonionic surfactant was determined by Fourier transform infrared spectroscopy and elemental analysis. The effects of concentration and degree of polymerization on surface tension were investigated. These new surfactants have good surface activity. The critical micelle concentration (cmc) is 9.30 × 10−3 mol/L, 8.50 × 10−3 mol/L, 8.10 × 10−3 mol/L, and 7.71 × 10−3 mol/L. The corresponding surface tensions at CMC are 28.38. mN/m, 28.60 mN/m, 30.40 mN/m, and 30.00 mN/m. Then focus on the foaming properties of BPPC. The results showed that the concentration of surfactant and Ca2+/Mg2+ had certain effects on the foaming properties and foam stability of cashew nut-based surfactants. Due to the relatively good foam properties of BPPC, it has broad application prospects in detergents and petroleum recovery.
Effects of Biochar on Absorption of Iron, Sodium and Manganese in Peach Seedlings
Authors: Wu Caifang , Li Qinyuan , Shu Junjiang , Xiao Ling , Gao Xinyu , Lin Lijin 
Published: March 2020

Abstract
An experiment was conducted to study the effect of biochar on absorption of iron (Fe), sodium (Na) and manganese (Mn) in peach. The results showed that compared with the control (CK), the Fe content of roots in wheat straw biochar addition (WB), corn straw biochar addition (MB) and the Fe content of leaves in paddy straw biochar addition (PB) remarkably increased by 244.8%, 265.2% and 28.3% respectively, and other treatments had no pronounced differences or apparently decreased. Biochar treatments significantly reduced the Na content of roots and significantly increased the Na content of stems and leaves with the exception of rape straw biochar addition (RB). RB and PB caused a significant decrease of the Mn content of roots and stems, expect for the Mn content of stems in RB, RB and PB significantly increased the content of Mn in leaves. The Mn content of peach seedlings in WB and MB had opposite change with RB and PB. Stated thus, MB promoted the absorption of Fe by peach seedlings, and most Fe stored in roots. Biochar treatments promoted Na accumulation in stems and leaves. RB and PB promoted the accumulation of Mn in leaves, WB and MB promoted the accumulation of Mn in roots.
Study on the design of imitative-ecological fishway in Xinjiang low-head hub
Authors: Luo Shijiao 
Published: March 2020

Abstract
This paper first introduces in detail the design concepts and the structure of the imitative-ecological fishway in Xinjiang low-head hub. Then, combined with the operation of fishway in a water diversion project in Xinjiang, this paper summarizes the key points to be followed in the construction of low-head imitative-ecological fishway in order to achieve the expected effect, thereby providing relevant design basis and ideas for similar projects in the future.
Observed spatial pattern of summer extreme precipitation in China and its potential links to rapid urbanization
Authors: Feng Kong 
Published: March 2020

Abstract
The variation and evolving tendency of extreme precipitation have received extensive concern worldwide in recent years under the background of global warming and rapid urbanization, which hold a great deal of significance for management of the risk of urban flood and waterlogging and water resources. The importance of anthropogenic factors represented by urbanization is recognized in the research of extreme precipitation variation, but its underlying mechanism and potential contribution remain unclear. Hense, the academic circles have not yet achieved consensus on this. Here we use daily precipitation dataset with 544 meteorological stations’ records to study spatial pattern of summer extreme precipitation and its potential response to urbanization from 1961 to 2010 in China. Frist, we gets each station’s threshold of extreme precipitation by using ordinary percentile method and the developed method named spatial sliding percentile. Then we define the proportion of extreme precipitation with total precipitation as the indicator to reflect extreme precipitation intensity. Based on the DMSP/OLS night light index dataset, the urbanization level of 544 meteorological stations are divided into six levels. Then we use ordinary percentile method, spatial sliding percentile and the developed method named spatial sliding anomaly to quantify the possible impact of urbanization on extreme precipitation threshold and intensity by doing a comparative analysis to 544 meteorological stations with different urbanization level. The results show that: The spatial pattern of extreme precipitation intensities derived from spatial sliding percentile is more distinguishable. Effects of urbanization make the threshold increased by 1.68% and there is a significant linear correlation between the average of extreme precipitation intensity and urbanization level, namely the intensity of extreme precipitation will increase by 0.62%, when the urbanization level increases by one grade. Therefore, effects of urbanization increase the risk of summer extreme precipitation of China.
Optimization of domestic inter-regional virtual water trade of agriculture products in China
Authors: Cai Rong , Hu Mengting , Guo Huiting , Fang Fei , Liu Jing , Zhang Sinan , Bai Xue , Zhang Lijia 
Published: March 2020

Abstract
In the face of increasingly severe pressure on water resources, the theory of virtual water and virtual water trade provides feasible solutions for improving the efficiency of global water use for agricultural products and alleviating the pressure on water resources in water scarce countries or regions. Optimizing the domestic inter-regional trade of virtual water trade of agricultural products can provide information to help for the formulation of China’s water policy. In this study, we will establish scenarios from the two aspects of economy and water resources allocation and utilization, to study the impact of virtual water trade on water saving of agricultural products trade between regions in China. One scenario does not consider water conservation, only economic revenue - net social revenue maximization scenario. Another way to consider water saving is to maximize water saving. With the maximization of net social revenue, 9.6 billion m3 of virtual water had been exported to other regions in the severe drought regions, saving 18.6 billion m3 of water in China. The net social revenue is 9.1 billion RMB. In the scheme of water-saving maximization, virtual water is exported to water rich regions in severe, moderate and mild drought areas, and China had saved 21.5 billion m3 of water. China’s net social revenue is 4 billion RMB. The results show that the optimization of agriculture products domestic inter-regional trade can have a favorable impact on the allocation and utilization of water resources.
Influence of proppant embedment on fracture conductivity
Authors: Zhang Kui , Kang Yunwei , He Xiaodong , Guo Zixi , Tian Gang 
Published: March 2020

Abstract
Using the national invention patent equipment, the proppant embedment experiment was carried out on the formation coal seam. The effects of proppant embedment on the conductivity of cracks under different proppant types, different proppant particle sizes, different sanding concentrations and different closing pressures were investigated. The experimental results show that with the increase of the closing pressure, the conductivity of quartz sand and ceramsite decreases rapidly; the conductivity of ceramsite is generally higher than that of quartz sand; the higher the concentration of sand, the proppant filling The stronger the layer’s compressive capacity and crushing resistance, the higher the fracture conductivity. XY ceramsite has the best conductivity.
The effect of axis ratio on the vortex-induced vibration of an elliptical cylinder
Authors: Kushwaha Vijay , Bao Yan , Zhou Dai , Nepali Ramesh 
Published: March 2020

Abstract
A numerical investigation is conducted to study the vortex-induced vibration (VIV) of an elliptical body subjected to transverse oscillation with the non-dimensionless mass (mr
) fixed to be 10 and Reynolds number set to be 100. Three sets of axis ratio (Λ) are considered in the analysis where, Λ is defined as the ratio of the major and minor axis, with minor axis aligned parallel to the flow. Spectral/hp element-based software, Nektar++ is employed for the solution of incompressible flow equations. The computations are conducted for reduced velocity ranging from 2≤U*
≤9. The amplitude response is directly proportional to the increase in axis ratio in association with the pre-initiation of lock-in regime for higher axis ratio. It is also noticed that the initial branch gets widened, whereas the lower branch is constricted when the axis ratio of the cylinder is increased. However, the vortex shedding pattern in all the branches is observed to be 2S and its various modes.