bluuebunny/crossref_metadata_2025_split huggingface dataset:
On total H-irregularity strength of graphs
Authors: Hidayatul M , Dafik  , Agustin I H , Nisviasari R , Kurniawati E Y 
Published: March 2020

Abstract
Let G be a graph with vertex set V and edge set E. Total labeling f : V(G) ∪ E(G) → {1, 2, 3, …, l} called a total l-labeling of a graph G. The total l-labeling is a total H-irregular l-labeling of graph G if for H ⊆ G, the total H-weights wtf
(H) = ∑
v∈V(H)
f(v) + ∑
e∈E(H)
f(e) are distinct. The irregularity strength s(G) of a graph G is known as the minimum k for which G has an irregular assignment using labels at most k. The total H–irregular a–labeling from the minimum where the graph G is called the total H–irregularity strength of G, is denoted by tHs(G). In this paper, we have obtained tHs from linegrid, buttrefly, hexagonal and diamond graphs. To obtain the tHs, we begin to study the total irregularity strength of graph G with subgraph H.
Modeling the relationship between public transportation and traffic conditions in urban areas : a system dynamics approach
Authors: Sardjono W , Selviyanti E , Perdana W G 
Published: March 2020

Abstract
The goals of the paper were to describe were and find the relations between numbers of available public transportation and traffic congestion and other variables that can reduce traffic congestion in Jakarta. The data that used in the simulation were provided by DKI Jakarta Provincial Statistics Agency from view years ago. To analyze the problem, System Dynamics are used to simulate the condition in the future using the models created based on relations between several variables. The results of the analysis shows that numbers of available public transportation cannot reduce traffic congestion if the numbers of private transportation weren’t decreased. It can be concluded that government must force their citizen to reduce the number of private transportation by increasing the inflation supported by increasing numbers of available public transportation to accommodate deficit in transportation while building new roads to accommodate transportation growth in the future.
On the super edge local antimagic total labeling of related ladder graph
Authors: Kurniawati E Y , Agustin I H , Dafik  , Marsidi  
Published: March 2020

Abstract
A graph G is an ordered pair of sets G = (V, E), where V is a set of vertices and E is a set of edges. The concept of labeling graphs has recently gained a lot of papularity in the area of graph theory. Antimagic labeling is the interest topic to studied. The study of antimagic labeling motivated by Hartsfield and Ringel. Arumugam et.al developed the concept of antimagic labeling that is local antimagic coloring. Thus, we study the concept of local antimagic namely edge local antimagic total labeling. By an edge local antimagic total labeling, a bijection f : V(G) ∪ E(G) → {1, 2, 3, …, |V(G)| + |E(G)|} satisfying that for any two adjacent edges e
1 and e
2, wt
(e
1) ≠ wt
(e
2), where for e = ab ∈ G, wt
(e) = f(a) + f(b) + f(ab). Thus, any edge local antimagic total labeling induces a proper edge coloring of G if each edge e is assigned the color wt
(e). It is considered to be a super edge local antimagic total coloring, if the smallest labels appear in the vertices. The chromatic number of super edge local antimagic total, denoted by γleat
(G), is the minimum number of colors taken over all colorings induced by super edge local antimagic total labelings of G. In this paper we study edge local antimagic total labeling and determined the chromatic number of graphs as follow grid graph, prism graph and mobious ladder graph.
On rainbow antimagic coloring of some graphs
Authors: Sulistiyono B , Slamin  , Dafik  , Agustin I H , Alfarisi R 
Published: March 2020

Abstract
Let G(V, E) be a connected and simple graphs with vertex set V and edge set E. Define a coloring c : E(G) → {1, 2, 3, …, k}, k ∈ N as the edges of G, where adjacent edges may be colored the same. If there are no two edges of path P are colored the same then a path P is a rainbow path. The graph G is rainbow connected if every two vertices in G has a rainbow path. A graph G is called antimagic if the vertex sum (i.e., sum of the labels assigned to edges incident to a vertex) has a different color. Since the vertex sum induce a coloring of their edges and there always exists a rainbow path between every pair of two vertices, we have a rainbow antimagic coloring. The rainbow antimagic connection number, denoted by rcA
(G) is the smallest number of colors that are needed in order to make G rainbow connected under the assignment of vertex sum for every edge. We have found the exact value of the rainbow antimagic connection number of ladder graph, triangular ladder, and diamond.
Design of assessment based on guided discovery to improve the quality of teachers’ professionalism of mathematics
Authors: Hidajat F A , Hidajat B I 
Published: March 2020

Abstract
This research aims to improve the quality of teachers’ professionalism in designing assessments based on guided discovery. Guided discovery is a good learning method in encouraging students to discover mathematical concepts themselves. However, the problem that occurs is teachers tend to apply traditional methods, do not recognize guided discovery methods and do not know how to design assessments based on guided discovery. Therefore, this research fills the gap of the problem by compiling a design of assessment based on the guided discovery. The research subjects were mathematics teachers and students in Probolinggo. The method in this research was conducted in 6 stages, namely: initial investigation, design, construction, validation, evaluation and revision, and implementation stages. Data analysis consisted of data reducting, displaying data, making a conclusion. The results of this research are five aspects of assessment, namely aspects reflecting previously idea; experiments openly; experiments independently; find solutions convergently; implement discovery into the problem-solving process. The percentage of validity from experts on the five aspects of this assessment system was 81.25% with criteria of “valid” whereas; the percentage of validity from practitioners is 90.62% with criteria of “valid”. The researcher recommends that improving the quality of teachers’ professionalism should be focused on the design of assessment based on guided discovery.
The development of think together about science in society (TToSS) learning model to increase critical thinking skill in science lesson
Authors: Yuwentin O , Mahardika I K , Nuriman  , Sudiatmika A A I A R , Sugiartana I W 
Published: March 2020

Abstract
This article discusses of how TToSS learning model is used to increase the critical thinking skill in science. The critical thinking is an skill to think rationally in assesing something in which before deciding or doing something. Critical thinking is a thinking skill that can be trained, so that this skill can be learn and developed. The development model used in this research is the 4-D development model. The question used in the experiment is development question that refers to train the critical thinking of students that is suitable with their age development. The first sintax model of TToSS is Think Alone; a stage of giving the illustration of the problem to stimulate the critical thinking skill of the students. The second stage is Think Together; the student with his/her group discusses about the problem given. The third stage is Share and Discuss, in this stage the students do the presentation of the result of the group discussion with entire groups in the classroom. The fourth stage is Evaluating; in this last stage the teacher evaluates all the activities during the lesson and corrects all misconception that might occur on the presentation and discussion.
Analysis of students critical thinking skills in junior high school on natural sciences based on the difference of learning styles
Authors: Aini M , Suratno  , Asyiah I N 
Published: March 2020

AbstractNatural Science is a learning related to everything around us. One of the subject matter in natural science is the motion system that often occurs in daily life. However, some of the students have misconceptions about the motion system. It required the critical thinking skills of the students in understanding the concept to resolve a problem in society. Critical thinking skills is one of the skills that must be possessed by students because of the demands in the 2013 curriculum. Critical thinking skills can be influenced by several factors, one of them is students’ learning style. This study aimed to analyze the critical thinking skills of junior high school on natural sciences based on the differences in learning styles. This study took sample of students in the first, second and third grade of junior high school. In this research, the researcher uses descriptive method. To analyze the data, the researcher used mix methods (qualitative and quantitative). The technique of collecting data uses observation and tests. Observation is used to find out the types of the students’ learning styles, while tests to measure student’s critical thinking skills. The results showed that there were verbal-linguistic learning style (73.0%), logic-mathematic (67.6%), kinesthetic (60.0%), visual-spatial (60.2%), music (62.0%), and interpersonal (61.1%). So, the verbal-linguistic learning style was better than critical thinking skills.
The profile of students’ mathematical representation in constructing line equation concept
Authors: Mulyono O C F , Sunardi  , Slamin  
Published: March 2020

Abstract
Mathematical representation is the way from students to express their ideas in understanding and solving mathematical problems in the form of images, words, and symbols. This research aimed to know the profile of students’ mathematical representation in constructing the straight-line equation concept. This research used a qualitative approach with descriptive research type. The subjects were 36 junior high school students at Jember. Data were obtained from the test, observation, and interview. Data triangulation was done by comparing data from the analysis of the answer sheet with interview data. The results showed in the activity of defining the concept of slope and straight-line equation, students made a visual representation during the process of finding slope and made verbal representation when defining straight-line equation. In the activity of determining a straight line equation, students made a symbolic representation and carrying out visual representation with among of them doing unique guesses in making an overview of the requested line position. In solving problems related to the concept of the straight line equation, some students chose visual representation to solve the two different problems. Some of the other students chose symbolic representation with some inaccuracy, and errors in the algebraic concept. While students who have been identified in the previous process have low ability tend to choose to use verbal methods and made guesses about the number of patterns.
Anxiety: how was the process of the undergraduate students who were in visualization level in constructing the definition?
Authors: Purnomo R C , Sunardi  , Yuliati N , Yudianto E , Mahfut M , Sa’dijah C 
Published: March 2020

Abstract
Definition is important mathematical construction which had been recorded as a challenging topic for teacher and students. This research showed the illustration of anxiety that happened to undergraduate students of Mathematics education who were in visualization level of thinking in constructing quadrilateral definition and definition form that had been successfully recorded. The analysis was done to determine the anxiety’s indicator that appeared and indicators of quadrilateral’s definition. Triangulation method was done to compare subjects’ worksheet, observation, and interview. The results showed that anxiety appeared when subjects started to construct the definition of quadrilateral so that the definition that had been defined was not efficient.
The analysis of students metacognitive in science with different learning environments on junior high school
Authors: Musyafaah N N , Suratno  , Nuriman  
Published: March 2020

Abstract
The essential nature of science includes the process of observing, discussing, analyzing and representing. Science must be supported by metacognitive abilities that refer to prediction, planning, monitroring, and evaluation skills and can make students become independent learners. This research was to analyze the metacognitive of students in science with different learning environments. This research place was in Junior High School, Boarding school and Islamic Junior High School in Bondowoso. This research has qualitative descriptive study with mix method (qualitative and quantitative). Qualitative data were descriptive based on the results of observations with teachers and students. Quantitative data were from the MAI test (Metacognitive Awarness Inventory). MAI test has two indicators, namely knowledge about conditions includes declarative knowledge, procedural knowledge, and conditional knowledge, and regulations of cognition including planning, information management strategies, and monitoring comprehension. The results of this research showed a difference in metacognitive 20% in the Junior High School and Islamic Junior High School in science.
Analyzing types of interaction in nuclear magnetic spectroscopy online discussion forums that affects student learning outcomes
Authors: Terra I W A , Wonorahardjo S , Suharti S 
Published: March 2020

AbstractMany research shows that interaction can increase concept understanding. Course interaction can be categorized in student-student interaction and student-lecturer interaction. Strong interaction can increasing students high order thinking skill. Learning design begins to pay attention to that interaction effect. Interaction can be done online and lead to cognitive understanding. This qualitative descriptive research aims to describe the cognitive process in an online discussion, specifically in analytical chemistry course. They learn about nuclear magnetic spectroscopy that most used in both qualitative and quantitative analytical chemistry. The subjects are seven groups consists of three chemistry students in their third year. They have three worksheets to discuss in three weeks about basic principal, instrument, spectrum, and experimental design in Nuclear Magnetic Resonance spectroscopy. Data sources are their online discussion transcript obtained from their elearning discussion forum. They also have pretest and posttest to analyze N-gain score. Their discussions are analyzed using coding categories to count the number of meaningful interaction. The trend of n-gain score and number of meaningful interaction are analyzed. Type of interaction that showed is ARA, ARC, ARI, DRA, DRI, and DRC. Results show that gain score correlates with number of meaningful interactions.
HOTS student worksheet to identification of scientific creativity skill, critical thinking skill and creative thinking skill in physics learning
Authors: Astutik S , Mahardika I K , Indrawati  , Sudarti  , Supeno  
Published: March 2020

Abstract
In the learning context of 21st century, teachers encounter many challenges in optimizing the process and the outcome of learning. Students who have higher order thinking skills will be able to think of scientific creativity, critical thinking and creative thinking. In this study, identification is done by measuring the ability of scientific creativity, critical thinking and creative thinking skills by HOTS student worksheet. The result showed that student’s scientific creativity with 6 indicators need to be develop esspecialy for physics problem solving and technical production. For critical thinking skills students obtain moderate results but have shown good results in answering physics problem. For creative thinking skills students get good results on the indicator fluency, flexibility and elaboration but for the originality still needs to be developed. Therefore, it is very important to develop a proper physics intructional design that can develop scientific creativity, crtical thinking and creative thinking skills.
Lipids source and degradation as revealed by molecular biomarkers in soils after acid-pretreatment: A case of a plantain soil under long-term cultivation
Authors: Li Yan , Liang Ni 
Published: March 2020

Abstract
The extractable lipids are important components in soil organic matter (SOM) which were used to trace the sources and degradation of SOM. The protection of lipids by soil mineral have been suggested through organic solvents. But, the extraction efficiency of some lipid compounds was low. This study applied a mild acid treatment to firstly remove most of the reactive mineral particles, and without altering SOM chemical structures in 10% HF/1M HCl (1:4 w: v). Based on the obtained lipid biomarker information, we observed that the lipid extraction efficiency significantly increased by organic solvents on after removal of active minerals. The acid treatment increased the scientific to quantitative the amount of lipids. The minerals showed significant differences in the selective protection to different components of lipids. In this study, the amount range of protected n-alkanoic acids is 73~85%, n-alkanol 41~62% and n-alkanes 26~46%. After the vegetation was replaced, the increased alkenoate and alkane in soil input by the plant tissues of plantain directly, and the alkanols probably input by the hydrolysis of wax esters. Under the interference of man-made tillage activities, the C content in 0-20 cm decreased, suggesting that cultivated activities may enhance SOM degradation and accelerate SOM turnover. Understanding SOM behaviour in this area will provide important information for soil management and to evaluate carbon cycling in human-affected ecological systems.
Catalytic performance of nickel catalyst dispersed in emulsion for the co-liquefaction of lignite and heavy residue
Authors: Yang Tengfei , Yan Ruming , Liu Congcong , Deng Wenan , Jiang Yao , Hu Tong , Li Chuan , Niu Qingshan 
Published: March 2020

Abstract
A kind of nanoemulsion nickel catalyst was prepared for the application of coliquefaction of lignite and heavy residue. The particle size and microstructures of dispersed phases in emulsion and the sulfurized product were characterized by dynamic light scattering and transmission electron microscope. Catalytic performances of prepared catalysts at different dosage were investigated and the microscopic features of solid residues with catalyst or not were compared. Experimental results showed the optimization mixing speed for emulsion nickel catalyst preparation was 2000 r/min, with an average diameter of 180 nm, and the active phases of prepared catalyst after sulfurization was Ni3S2. The emulsion nickel catalyst displayed a favorable catalytic activity, with a coal conversion efficiency of 93.7 % and an oil yield of 72.33 wt%. The fragmented shapes and lowed diameters of solid residue with prepared catalyst relative to no catalyst further displayed its significant roles in the inhibition of condensation reaction and coke formation.
Research on the path of low-carbon city system construction mode based on energy consumption per unit output value method
Authors: Bi Xiaoqing , Wang Dandan 
Published: March 2020

Abstract
In recent years, low-carbon research has become a research hotspot in urban system construction. Cities consume a large amount of carbon-based energy and are an important research object in low-carbon research. This paper first quantitatively analyzes the correlation between the three major industrial structures and the industrial energy consumption structure. At the same time, it studies the substitution of multiple energy sources, and obtains the mechanism of action of the low-carbon city system. Through the collection and analysis of data, the necessity of improving energy efficiency for the development of low-carbon cities has been proven. On the basis of this data analysis, this paper uses the method of energy consumption per unit output value to build a scenario analysis model of urban carbon emissions, puts forward four models of low-carbon urban system construction in terms of material flow, and gives the path planning and selection of low-carbon urban system construction.
Research and countermeasures of the influence of air pollution on human body
Authors: Yang Kai 
Published: March 2020

Abstract
In recent years, with the development of the economy, environmental problems have become more and more serious. Air pollution not only affects the climate and the living environment, but also has an unimaginable impact on the human body. The adverse effects of air pollution are not limited to physiological health damage, but also involve negative effects in many aspects such as cognitive function, mood and behavior; air pollution can cause damage to the nervous system, brain function and cognitive function, and the damage is concentrated in children, Susceptible people such as the elderly and chronically ill patients. Air pollution can reduce subjective well-being, leading to anxiety, depression, and even increased risk of suicide. The physiological mechanisms by which different sources of pollution affect cognitive and mental health are different. In order for human beings to survive for a long time, research and countermeasures against the causes of air pollution are essential. This paper analyzes the causes of a series of effects of air pollution on humans and proposes corresponding countermeasures.
Hydrothermal Oxidation of Polyethylene (PE) Plastic to Short-chain Fatty Acids (C1 - C5)
Authors: Zhou Wanning , Zhong Heng , Jin Fangming 
Published: March 2020

Abstract
In most of the past studies on disposal of waste plastic, due to the irreversible hazards for human environmental health (incineration), and the strict requirements of reaction conditions (pyrolysis, gasification), the cost of disposal and research also increases. In this study, we converted waste polyethylene (PE) plastic into high value-added organic products by high-temperature water (HTW) to obtain C1 to C5 short-chain fatty carboxylic acids (formic acid, acetic acid, propionic acid, butyric acid and valeric acid). In addition, the reaction parameters (temperature, time, oxidant amount, pH) were investigated under hydrothermal conditions, and the yield for PE to short-chain fatty acids (C1 -C5) was optimized to 20%. Then the concentration of TOC and IC in the solution was used to measure the conversion and degradation of PE. In addition, the oil phase and solid residue after the reaction were also discussed in this research.
Study on the variation characteristics of annual rainfall and runoff in Oujiang River Basin of Zhejiang Province
Authors: Hu Haiying , Lin Junsheng , Huang Huamao 
Published: March 2020

Abstract
In this paper, Mann-Kendall method and wavelet analysis method are used to analyze the annual rainfall and runoff data in Oujiang River Basin of Zhejiang Province, and the following conclusions are obtained: in the past 50 years, the annual average rainfall series increase and the annual runoff series decrease in Oujiang River Basin. The reason for this is that in 1960s, many hydraulic structures were built near Xuren station, such as river dams, which led to the rapid decline of runoff in the flood season. The results of Morlet wavelet analysis show that there is significant multi-time scale variation characteristic in the annual average rainfall and runoff series. The periodicity of the annual rainfall series exhibits three types of variation trends for different time-scales, i.e. 22-to 30-year scale, 10-to 22-year scale, and 3-to 10-year scale. While the periodicity of the annual runoff time series exhibits three types of variation trends for different time-scales, i.e. 15-to 25-year scale, 8-to 15-year scale, and 3-to 8-year scale.