bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Content of Lead (Pb) at The Water and Lobster (Macrobrachium rosenbergii L.) in Water of Alalak River on West Berangas Area
Authors: Halang B , Astuty A A 
Published: January 2020

Abstract
The aim of this research was to know how the content of lead in the river, the meat and the shell of lobsters at the Alalak River of Berangas Area. The kind of this research was descriptive research, which was to describe something of the condition according to nature. Instruments used consists of some tools and materials. The tools were : Atomic Absorption Spectrophotometry, bucket, and stoppered glasses and water and lobsters as materials. The method of this research was a descriptive method. Procedures of this research were to take off the water, and lobster samples are done with direct observation in the field which consisted of four sampling points. The water samples were entered into the bucket, and the lobster samples were entered into the stoppered glasses. Technical measurement of Pb at the water and the meat, as well as the skin of the lobsters, using the Atomic Absorption Spectrophotometry tool. The Pb content tests of water were done at the Health Laboratory of Banjarmasin, whereas Pb content tests of the meat and the skin of lobsters were done in the Basic Laboratory of MIPA Banjarbaru. The results showed that the Pb contents in water were average of 0.0208 mg/l. It was below the threshold of quality standard (0.3 mg/l) based on regulation of South Kalimantan Governor No. 05 in 2007. The averages of Pb contents in the meat of lobsters were 5.147 mg/Kg, and in the skin of lobsters were 15.02 mg/Kg. The Pb content of the meat and the skin of the lobsters were upper the threshold of quality standards (0.1 mg/Kg) based on decision of Dirjen POM no. 03725/VII/1989. So, people should reduce to consume the lobsters from Alalak River especially communities of Berangas and its around areas.
Developing high school physics teaching materials through 7E learning cycle model
Authors: Hartini Sri , Suci Abyati Dinda , M Abdul Salam 
Published: January 2020

Abstract
Research has been conducted which aims to describe the feasibility of high school physics teaching materials through the 7E learning cycle model. The feasibility of teaching materials is evaluated from the validity of teaching materials, the practicality of teaching materials, the effectiveness of teaching materials, and the achievement of science process skills. This research is a research and development based on the Dick & Carey development model. The subjects of this research are 30 students of science class in one of the high schools in Banjarmasin. The instruments of this study are; the validation sheet of teaching materials, the implementation sheet of the lesson plan, the science process skill observation sheet, and the student learning outcomes test. The results showed that the teaching materials are categorized as good, the practicality of the teaching materials categorized as very practical, the effectiveness of the teaching materials included in the medium category, and the achievement of science process skills categorized as quite good. It was concluded that the high school physics teaching material on straight motion material through the 7E learning cycle model model developed is suitable to use in learning.The first section in your paper
Eye-tracking and metacognitive skills: A review on the use of eye-tracking for measuring students’ metacognitive skills in chemistry learning
Authors: Muna Khairiatul , Bahit Muhammad 
Published: January 2020

Abstract
This study presents a review of empirical studies on eye-tracking in the education field and aims to describe the use of eye-tracking methods to measure students’ metacognitive skills in chemistry learning. Eighty papers published from the 2000s to 2018 that containing major discussion on students’ metacognitive skills in chemistry learning and the use of eye-tracking were selected for review and analysis. Content analysis for 6 month of the selected papers showed that (1) the eye-tracking for measuring students’ metacognitive skills in chemistry learning was employed by recording all eye movement activities with eye tracker placed under the computer screen with a distance of 60-70 cm from the users (students) and they can freely move the eye for solving the chemistry problems with a predetermined duration of time; (2) analysis of temporal and spatial data of eye-tracking showed a correlation between eye movement and increased metacognitive skills, in which the stabilization of students’ views on objects observed between 66-416 ms reflected both eyes and mind worked actively. Thus, researchers can employ the eye-tracking method to comprehensively investigate and describe students’ metacognitive skills in chemistry learning and also can be a metacognitive tool for reflective self-assessment in learning.
Does learning chemistry by representation with “Jaman-Now App_Permilang” effectively impact students’ cognitive & motivation?
Authors: Almubarak  , Hidayah N , Agustina S , Taufiqurrahman  
Published: January 2020

Abstract
Technology has become a major component in every aspect of human life, and learning resources had included in that aspect. This issue described media for learning the “Jaman-Now App Permilang (JNAP)” can have an effect on students’ cognitive and their motivation in the learning process. The quantitative approach was the method used in this study, where this research was a part of the development research conducted by researchers, in which this research presentation specifically explained aspects of the effectiveness of the product being developed. Product feasibility tests are carried out in the school environment through two processes (limited & extensive test). Those processes were used with observation, testing, and questionnaire techniques as a measure of product success. The feasibility of this research focused on the effectiveness of the product in chemical learning where this effectiveness is assessed as an indicator of product feasibility with a valid instrument (cognitive tests, questionnaire). Statistical data revealed that the average N-Gain in the 1st process has a point of 0.25 (low), the 2nd process was 0.42 (medium), and very good criteria for the motivation aspect. The results indicated that the product has a good enough impact on the co-positivity and motivation of students, although the visualization of the values shown in the medium criteria. In other words, the product has the potential to become one of the strategies in improving the quality of chemical learning, assessment for chemistry learning, strengthening their cognitive, and guidelines for students in reflecting themselves in an understanding of the chemical material.
Individual Learning Plans Program Evaluation of Planning Education in Junior High School: Discrepancy Model
Authors: Sugianto A 
Published: January 2020

Abstract
Learning Plans (ILP) is a guidance and counseling program that can be used to help learners educational planning and decision making further studies SMA / MA / SMK. In order to implement professional programs, the program organized by following the rules of implementation of ILP existing program. However, the implementation of the ILP program on educational planning of students in the school are not just using established standards. Describe research purposes disparities in aspects of the preparation, organization, implementation and assessment in implementing the ILP program at the school. Evaluation study using a discrepancy model oriented towards a program decision. The approach used is a systems approach that is focused on aspects of the preparation, organization, implementation and evaluation of the ILP program. This evaluation study using a mixed method design with congcurrent model of triangulation. The results showed that the implementation of the ILP program in school SMPN 2 Barabai by 55% from the standard 100%, which means that the implementation of the ILP program concluded very far below established standards. Based on the results of the study, the proposed recommendation to be continued with the requirements made a number of improvements.
Guided Inquiry Assisted Concept Map to Improve Students Metacognition Skills
Authors: Leny  , Syahmani  , Ningsih F , Sanjaya R E 
Published: January 2020

Abstract
Metacognition is aspect in an effort to build students’ understanding of chemistry. Preliminary study conducted at SMAN 1 Banjarmasin showed that only a few students who can evaluate their learning process, so that the ability of students using metacognition in learning process is still low. The guided inquiry assisted concept map with metacognition approach is an alternative to improving students’ metacognition skills in learning process. The research was carried out using classroom action research design with two cycle. Each cycle consists of planning, action, observation and reflection stages. The subjects of this study were students of XI Natural Science 5 SMAN 1 Banjarmasin with 36 students. The research data collected using metacognition skills test instrument and non test instrument. Data were analyzed with quantitative descriptive and qualitative analysis. Metacognition skills of students has increased after treatment with guided inquiry assisted concept map. The process of implementation of the action is seen from teacher and student activity. Teacher activity increased from 71, 77 to 87.94. Student activity increased to 87, 4 from beginning at 68, 16. Implementation of quided inqury assisted concept map model with metacognition approach can improve students metacognition skill, student activity and teacher activity.
Development of android-based chemistry learning media for experimenting
Authors: Putra P S , Asi N B , Anggraeni M E , Karelius  
Published: January 2020

Abstract
Learning media is an important component in the learning process. Technology and computer-based media is one of the media needed. It aims to attract students to learn chemistry material, especially material that need more efforts to understand. This research aims to develop android-based chemistry learning media for experimenting by using simulation models in Senior High School 2 Palangka Raya. The methods of this study are a research and development (R & D) by Alessi and Trollip. Product testing consists of an alpha test and a beta test to determine the level of product feasibility and test the effectiveness of products on student learning outcomes. The instruments that used to collect data were observation sheet, interview guidelines, scoring questionnaires, and test. The data that have been collected were analysed by qualitative descriptive technique. The results of this study can be concluded: 1) Learning media is very good. 2) Learning material is very good. 3) The individual test result is very good. 4) The small group test result is very good. 5) The final product trial result is very good. The android-based chemistry learning media produced is worthy to be used and effectively used in upper class students and middle class students, but it is not yet effective to be used in lower class students.
Analysis of Cellulose Isolated from Sugar Bagasse: Optimization and Treatment Process Scheme
Authors: Kunusa W R , Abdullah R , Bilondatu K , Tulie W Z 
Published: January 2020

Abstract
PT. PG. Gorontalo is the largest sugar factory in Gorontalo province in which 10% of sugarcane waste is not utilized properly. In this study, the isolation and characterization of cellulose and α-cellulose from bagasse in the processing of alkali were 0.1M and 1.0M NaOH solution. The analysis method consisted of counterfeiting, dehemiselulose, delignification and bleaching of 10% H2O2 and 1% MgSO4. The next step was purification of cellulose to α-cellulose. Cellulose content was 75%, α-cellulose 37.89%. The characterization of the physico-chemical properties of the product included density analysis, viscosity, 2.01% moisture content, 5.01% ash content, pH 7.7 solubility test in 1M HCl, HNO3 1M, H2SO4 0, 2M, Ba(OH)2 0.5M, KOH 0.5M, CH3COOH 1M, NaOH 2M, NH4OH 1M. The IR α-cellulose spectrum showed the presence of –OH group at wave number 3419, 3331, 3344, 3360 cm-1. The C-O bond at 1635 cm-1, 1642-1649 cm-1 showed different C-O stretch vibrations in cellulose I and cellulose II fibers and C-O bonds in 1161.83 and 1063-1065 cm-1, 995-895 cm-1 showed a change in the residual l about the glycosidic bond to Cellulose II which interprets α-cellulose. Morphological analysis used SEM while the degree of crystallinity used Diffractogram XRD.
Component based Finite Element Design of Seismically Qualified Joints
Authors: Wald F , Vild M , Kuříková M , Kožich M , Kabeláč J 
Published: January 2020

Abstract
This paper describes the principles of Component Based Finite Element Modelling (CBFEM) and the system response quantity and application features for design of prequalified joints for seismic applications. The elements are analysed by geometrically and materially non-linear analysis with imperfections (GMNIA). The proper behaviour of components, e.g. of bolts, anchor bolts, welds etc., is treated by introducing components representing its behaviour in term of initial stiffness, ultimate resistance and deformation capacity. To show this process a contribution is prepared, which summarises the history of achievements of FEA application in structural connections. Contribution shows the currents trends in advanced modelling of connection components and differences of the research oriented and design-oriented models. Both have their roles in advanced analyses.
Numerical simulation and experiment on steel fiber concrete beams
Authors: Khai Lam Thanh Quang , Thi My Dung Do , Ngo Van Thuc , Chuc Nguyen Trong , Phuoc Huynh Trong 
Published: January 2020

Abstract
The present study aims to investigate the effect of steel fiber addition on the behavior of the concrete beam in terms of crack formation, displacement, and deformation. The normal concrete (B20) was designed for making the beam with the target strength of 20 MPa. Different percentages of steel fiber (4% and 8% by volume) were added to the B20 mixture in order to evaluate the effectiveness of steel fiber addition to the concrete beams. The steel fiber concrete beams were subjected to the tests of crack formation, displacement, and deformation under loading. The numerical simulation by ANSYS computer software was also performed for comparison. As a result, the addition of steel fiber to the concrete beams was found to have positive effects as reducing both crack formation and the displacement as well as the deformation of the beams. Besides, the ANSYS modeling showed similar results as observed by the experiment.
Methods of construction of objects taking into account the simulation of the temperature regime of hardening concrete
Authors: Pulyaev I S , Pulyaev S M 
Published: January 2020

Abstract
The article is devoted to the use of different methods of construction of the object, depending on the boundary conditions set in the process of its design and construction. The aim of this work is a compilation of the various methods of investigation of the temperature regime of hardening concrete, aimed at providing the required timing of the turnover of a formwork, with a view to ensuring the consumer properties of the structures. The scientific novelty of the work lies in the updating and testing of methods for regulating the heating of hardening concrete, ensuring the formation of the required consumer properties of structures not previously used in transport and civil construction, based on preliminary modeling of thermal processes occurring in the hardening concrete, through the calculation software. The use of modern calculation and analytical complex allowed to obtain the results as accurately as possible comparable with the observations obtained during construction, which allowed to develop projects for the production of works on concreting objects erected in different conditions, with the necessary consumer properties.
Application of one mathematical method in solving boundary value problems of natural vibrations of a rectangular viscoelastic plate located under the surface of a deformable medium
Authors: Adamov A A , Dzhanmuldaev B D , Janmuldayeva A B 
Published: January 2020

Abstract
Using of one mathematical methods on solving the boundary value problems of natural osclillations of viscooelastic rectangular plate which are beneath the surface of deformable media. In this work the natural frequency of rectangular plate which is beneath the surface are researched by the method of decomposition. The efficiency and the relative simplicity of this method. In the present work, the natural vibration frequencies of a rectangular plate below the surface using the decomposition method are explored. The effectiveness and comparative prostate of this method is shown.
Account for the contribution of higher vibration modes under seismic resistance estimation of system with elastomeric supports by nonlinear static method
Authors: Zubritskiy M A , Ushakov O Y , Sabitov L S , Kolesnikov A V 
Published: January 2020

Abstract
The article presents higher vibration modes accounting method to evaluate system seismic resistance by nonlinear static method. As part of the study, in order to verify the proposed method for finding the inertial forces modified system series of dynamic and static calculations was performed. Proposed inertial forces modified system can be applied for seismic resistance estimation of system with elastomeric supports. The results difference varies within 12%.
Frame structures optimization based on evolutionary modeling in active overall stability constraints
Authors: Alekseytsev A V 
Published: January 2020

Abstract
A method of stochastic search for rational solutions for steel frame structures based on the genetic algorithm has been developed taking into account the presence of an active constraint on structure stability. To evaluate the stability, an internal iterative cycle is introduced into decision making process during which the finite element technique equation system is solved in the presence of a geometric matrix. An example of bar optimization taking into account the loss of stability under various loading options is considered. When implementing the genetic algorithm, an adjustable mutation operator is used along with penalty function, which regulates the degree of violation of constraints on the displacements of the frame system and critical stresses acting within the bar.
Stability analysis of reinforced concrete building frames damaged by corrosion under static-dynamic loading
Authors: Savin S Yu , Fedorov S S 
Published: January 2020

Abstract
The paper presents a methodic for calculation reinforced concrete frame-braced structural systems, when it was damaged by corrosion, against loss of stability in over limit state caused by removal of a load bearing element. The authors obtained analytical expressions for assessment stiffness of reinforced concrete compressed-bent elements taking in account its nonlinear deforming. Such expressions allow conducting stability analysis of structural systems under consideration.
Experimental and numerical substantiation the efficiency method of compaction of soil base by creating sealing pressure inside soil massif
Authors: Lobacheva Nataliia , Yarkin Viktor 
Published: January 2020

Abstract
This article provides a method of compaction of the soil base by creating a sealing pressure inside the soil massif. Nowadays, in buildings reconstruction, which is accompanied an increase loads on the foundations, in constrained conditions of dense urban development, the question strengthening of bases of foundations is important. The proposed a method of compaction of soil base by creating a sealing pressure inside soil massif is applicable both for new construction and for reconstruction of any objects in dense urban development. It carried out a comparative analysis of results of experimental and theoretical studies of the bearing capacity of piles with different parameters of broadening and compacted zone obtained by the method of compaction of soil base by creating a sealing pressure inside soil massif. Numerical studies to determine the bearing capacity of piles were performed in axisymmetric formulation using Hardening-Soil model. The method of determination of changes bearing capacity of base in depending on the diameters of broadening and compacted zone was carried out on a specially designed stand is presented. The article presents the results of experimental and numerical studies of bearing capacity of bases foundation.
Evaluation of shear resistance for beam-column connections using ultra high performance steel fibre reinforced concrete (UHPSFRC) under cyclic loading by experimental research
Authors: Thuy Van Tran Thi , Tran Trung Hieu 
Published: January 2020

Abstract
Evaluation of behavior for beam-column connections in the buildings under cyclic loading is extremely important, where shear resistance is one of the important factors. Beam-column connections are considered places in which stresses are concentrated during working process and it is clearly showed in exterior beam-column connections. There have been many published research and experimental investigations for the external beam-column connections. The use of new concrete material (UHPSFRC) for strengthening the external beam-column connections is a new idea and has not been much studied yet. Therefore, this paper presents the experimental investigation results for shear resistance of external beam-column connections followed EuroCode 8 [1] with ductility class high (DCH). This experimental result proposes the idea about strengthening for beam-column connections, provide additional experimental data and help the design process followed seismic specification of Vietnam.
The optimization of radiation protection to interventional cardiologists
Authors: Pratiwi N G , Ardiatna W , Pawiro S A , Wigati K T , Soejoko D S 
Published: January 2020

Abstract
Scattered dose radiation to occupational in interventional cardiology cannot be neglected due to the long time for each procedure. The limit dose for occupational is 20 mSv per year or 0.01 mSv/h. The aim of this study is to calculate the effective dose of occupational and to analyse the optimization of radiation protection in the Cath lab. The simulation has been done using Rando phantom as a patient and Unfors Xi as scattered dose measuring instrument (in mGy/h). The data is collected in 6 different positions from altitudes 25 cm to 75 cm with a range of 15 cm without protective shielding. Field size of primary beam is varied to 20×20 cm and 25×25 cm, while gantry tilt is varied to caudal, cranial, and Left Anterior Oblique (LAO). The obtained data is multiplied by weighting factor base on its height. The result shows that the effective dose of occupational is in the range of 0.18-0.94 mSv/h, which is exceed the limit dose. To accommodate the limit dose for occupational, we propose the limitation of procedure time to 21-110 hours a year or the use of protective shielding as thick as 1-1.6 mm lead.