bluuebunny/crossref_metadata_2025_split huggingface dataset:
Current development of geopolymer cement with nanosilica and cellulose nanocrystals
Authors: Rahmawati Cut , Aprilia Sri , Saidi Taufiq , Aulia Teuku Budi 
Published: February 2021

Abstract
The cement industry has contributed large amounts of CO2 emissions and is responsible for the consumption of non-renewable natural resources. Geopolymer based cement has emerged as an environmentally friendly alternative to construction materials because it can be produced from industrial waste. Similar to ordinary portland cement, geopolymer cement can be strengthened with nanomaterials. This paper presents a review of nanosilica and cellulose nanocrystals in geopolymer cement. The addition of nanosilica can improve the properties of pozolan which is able to bind calcium-hydroxide so that the resistance to sulfate corrosion will also be better and nanosilica can also increase chemical reactions due to its surface area. Nano-sized cellulose-based particles can fill the smallest gaps in cement paste that cannot be treated by other micro or macro sized materials. This paper also presents an overview of the latest advances in the production of geopolymer cement that reinforced by nanosilica and cellulose nanocrystals as promising sustainable construction materials.
Loading Capacity Calculation of Integrated Precast Slab and Column Panel Using Cold-formed Steel
Authors: Muliawan Sutanto , Saggaff Anis , Mahmood Tahir , Saloma  , Firdaus Muhammad , Aminuddin KM 
Published: February 2021

Abstract
In the current study, the precast panel using a cold-formed steel section integrated with a cold-formed steel section integrated with self-compacting concrete was connected to the precast column panel. A T-shaped plate was used as a joint connector. Point loading applied onto the free-side of the slab panel. The material used to form a composite slab panel was C12524-type of cold-formed steel section as the reinforcements and it was integrated with self-compacting concrete. The connection in this research was divided into two-part. It was the side part and the middle part. The quality of cold-formed steel was fy = 530 MPa and fu = 590 MPa, the quality of the T-shaped plate connector grade was S355. The bolt diameter was variated with 10 mm, 12 mm, 14 mm, and 16 mm. The bolt quality was grade 8.8 (fy = 800 MPa). The calculation was the moment joint capacity of the connection and the stiffness. The moment joint capacity was increased within the bolt diameter increased. The side part of the specimen had the highest stiffness value; the bolts that could be used were M10, M12, and M14. To use the M16 bolt, configure the bolt spacing to be compatible with the standard BS EN 1-8:2005 [1].
Physical and Mechanical Properties of Self-Compacting Concrete (SCC) with Pineapple Leaf Fibre and Polypropylene
Authors: Hendrian Hanoora Sarah Anindita , Saloma  , Hanafiah  , Iqbal Maulid M. , Juliantina Ika 
Published: February 2021

Abstract
SCC is a high-performance concrete innovation that does not require vibrating equipment at the time of placement and compaction. The purpose of this study is analysis the ratio effect of fiber gain on physical and mechanical properties of SCC. This research uses fiber with fiber variation and content as additional material. The variation of fiber is pineapple leaf fiber and polypropylene with w/c is 0.3. The variation of fiber has length 12 mm with fiber content 0.2%, 0.3% and 0.4% of cement weight. Testing the physical properties or characteristics of SCC conducted in this study was slump flow, V-funnel and L-box. The testing of mechanical properties performed at the ages of 7 and 28 days for compressive and flexural strength. The addition of fiber showed the effect on physical and mechanical properties of SCC. Increasing the fiber content showed an increase in flexural strength accompanied by a decrease in the value of the diameter and time of fresh concrete. Maximum compressive strength was obtained with the use of 0.3% fiber content of 56.28 and 58.04 MPa for pineapple leaf fiber and polypropylene at the ages of 28 days. The 0.4% fiber content provided a maximum flexural strength of 7.76 and 8.16 MPa for pineapple leaf fiber and polypropylene at the ages of 28 days.
Optimization of Normalized Least Mean Square Algorithm of Smart Antenna Beamforming for Interference Mitigation
Authors: Hidayat Rahmad , Ramady Givy Devira , Lestari Ninik Sri , Mahardika Andrew Ghea , Fadriani Hetty 
Published: February 2021

Abstract
A smart antenna is an array of antennas with signal processing capabilities to transmit/receive information in an adaptive manner. This capability continues to be investigated to find the best adaptive algorithm for the desired beamforming capability. This paper aims to provide a study and analysis of the effect of the normalized least mean square (NLMS) algorithm on step size parameter settings which have an impact on the desired minimum square error (MSE) value and on the nulling beam radiation pattern arrangement of smart antennas in its role in mitigating interference. The simulation for beamformer performance for 1000 iterations was carried out using the Matlab tool on the additional white noise gaussian (AWGN) channel and the simulation parameters were changed to some step size values (μ) with the NLMS algorithm for 16 antenna elements. The effect of the value of the step size μ is seen in the iterations number that takes place before the minimum error noise is obtained, where the increase in the value of this step size reduces the iterations number required; at the same time further improving MSE levels. From the pattern of amplitude response after the beamforming process, the result is an escalation in the number of nulling to increase the distance between the spaced elements taken. The interference source is eliminated/closed by placing the nulls in the path of the interference source where the worst interference level is obtained around -90 dB when the smallest step size is taken.
Key Factors Affecting the Application of Building Information Management (BIM) in Management of High-Rise Building Construction Volume
Authors: Nguyen Thu Anh , Nguyen Phong Thanh , Do Sy Tien 
Published: February 2021

Abstract
Each construction work has its volume to be built. The use of traditional 2D methods in the breakdown and management of high-rise building construction volume has recently faced quite a few challenges; for instance, some projects construction has been prolonged or project-cost estimates are unsound due to duplicated or omitted calculation. This happens because the quantity surveyor (QS) manages the construction volume manually and relies on 2D design drawings for calculations. For this to be solved, the adoption of BIM technology in construction volume management should be an irresistible choice. BIM technology empowers the breakdown and management of work volume by automating the calculation of volumes and updating structure parameters as well as integrating design, progress and cost data into a single 3D model. This paper identifies the main factors affecting the application of BIM of high-rise building construction volume.
Flood Problem in Pekanbaru City Analysis Using GIS Approach
Authors: Kausarian Husnul , Suryadi Adi , Susilo  , Batara  , Sumantyo Josaphat Tetuko Sri 
Published: February 2021

Abstract
Pekanbaru City, Riau Province, Indonesia is located at coordinates 0°25′29.20″-0°39′15.22″ N and 101°20′43.39″- 101°34′25.60″ E. This research aims to study the common causes of flooding in Pekanbaru city which has a good geological condition. This study uses two types of data as primary and secondary data in the form of geomorphological, geological, rainfall and land use data with a geographic information system (GIS) analysis that can help spatial analysis to determine the level of flood disaster vulnerability with visual mapping models. The geomorphological analysis shows 2 types of geomorphological units found: low-land denudational and low-land structural with river flow pattern consisting of dendritic, sub-dendritic and parallel. Rainfall is quite high in 2018 with 2621.5 mm and caused flood-prone areas which are divided into 3 categories: Non vulnerable area (64.575%), Medium Vulnerable area (23,386%) and Vulnerable area (12,039%) from the entire of the research area.
Prototype Plate Bending Tool 1 mm Size in the Process of Making a Fence with an Anthropometric Approach in the Pasuruan Regency Welding Workshop
Authors: Asy’ari Subchan , Setyawan Leo Virgi , Wahid Abdul , Huda Miftahul , Misbah Achmad 
Published: February 2021

Abstract
In the process of bending the plate making fence workers have difficulty because the process of bending the plate is still done in a conventional way as well as the absence of bending tools that correspond to the posture of the welding workshop bending in Pasuruan district area. The condition of the workers that occurred in welding workshop bending in Pasuruan district at the time of bending the plate is considered not ergonomic, because with the position of the dimensions of the body is not suitable. Among them the head bends, the back bends, the legs bend, the hands bend and the production results are less maximal. In the design of this bending tool uses an anthropometric approach in determining the design of ergonomic bending tools and providing worker comfort, samples used from 20 workers. Based on research conducted in welding workshop in Pasuruan Regency area, researchers proposed the idea of an ergonomic bending tool designed based on an anthropometric approach. With this bending tool, it is expected to be a solution to get comfort and security while working so as not to interfere with the work process. The presence of this product is expected to encourage innovation in the field of designing work systems and ergonomics.
Electronic Equipment Control System for Households by using Android Based on IoT (Internet of Things)
Authors: Irawan Yuda , Wahyuni Refni 
Published: February 2021

Abstract
Utilization of internet based on technology is currently widely used as a means to facilitate control. This research utilizes internet technology and a microcontroller as an automatic control. The purpose of making this tool is to create a control system for household electronic appliances using an IoT based on android. This household electronic equipment control system can assist users in controlling household electronic devices such as: Lights, AC (Air Conditioner), Water Machines, Dispensers, Fans and others. Household electronic equipment control is made using a Wemos D1 microcontroller that is communicated with the internet network. The use of software is also done by installing the application on an android smartphone as a media control tool. The output from wemos d1 is then connected to the relay module which is then connected to the electronic device. The results of this study are in the form of a prototype of a household electronic equipment control device. Based on the test results it can be concluded that the household electronic equipment control system works in accordance with its function. Besides this tool is also very efficient because it can save time for controlling the device from a long distance though.
Reproving the basic principles of fuzzy sets for the decisions
Authors: Nasution Mahyuddin K M 
Published: February 2021

Abstract
Principles in the logic and the sets form the basis of many societal solutions that are present with physical as well as non-physical phenomena. Non-physical phenomena, for example present language variables that require the presence of the fuzzy logic and the fuzzy sets. Although specific verification of the rules used remains the same, the systematic verification for the fuzzy sets requires a strategy, including when implementing it into a computer program. The final problem has the answer to the change in the operator implemented in the program.
From recursive to dynamic: An algorithm for dealing with a problem
Authors: Nasution Mahyuddin K M , Tarigan J T , Jaya I 
Published: February 2021

Abstract
One of the problems in data science is related to data management, especially big data. It is indirectly related to algorithms in computer science. Therefore, the meeting between big data and the appropriate algorithm to produce a good output requires characterization and explanation. This paper reveals one of them, by involving the recursive and dynamic principles of programming, and by comparison giving choices as answers to problems.
Model of Truck Travel Timeliness Based on Driver Environment Psychology and Technical Factor: A Warp.PLS-SEM Approach
Authors: Yuniar D , Djakfar L , Wicaksono A , Efendi A 
Published: February 2021

Abstract
The importance of knowing the factors that influence coal transportation travel time based on driver behavior through work motivation. This research to assess the effect of presents inferential statistical data that determined the impact of environmental psychology and technical factors such as operational operational, social, health conditions, road quality, truck conditions, and weather on the travel timeliness with intervening work motivation. The data collected from 116 coal drivers using coal haul private roads in South Kalimantan, Indonesia. The research method uses qualitative and quantitative with structured drivers demographic and behavior questionnaires distributed to drivers. Structural equation modeling (SEM) using the Warp. PLS version 6 package to display the primary data results. Result-based research analysis on the hypothesis shows the more significant the road quality of coal haul drivers will increase work motivation and travel timeliness via work motivation. The higher the work motivation of coal haul drivers will increase travel timeliness performance. Based on the research equation that increasing operational working conditions, social conditions, road quality, truck conditions, weather conditions, and work motivation tend to increase travel timeliness. However, for health conditions negatively affect travel timeliness through work motivation, so the better health conditions will reduce travel timeliness.
Exploring the computational thinking of our pre-service mathematics teachers in prepare of lesson plan
Authors: Maharani Swasti , Nusantara Toto , As’ari Abdur Rahman , Qohar Abd 
Published: February 2021

Abstract
Computational thinking is indispensable to face the challenges of the 21st century, including education. Recently there are a lot of issues about the inclusion of computational thinking in the curriculum in Indonesia. Of course, this requires teachers in Indonesia to understand and apply computational thinking. One example of the application of computational thinking by the teacher is in preparing lesson plans. The purpose of this study is to analyze computational thinking in pre-service mathematics teachers in preparing lesson plans. Using qualitative methods, the subjects in this study were six pre-service mathematics teachers. The analysis is done by observing the steps taken by the subject in preparing lesson plans and conducting in-depth interviews to reveal the subject’s computational thinking. The results revealed that generalizations were less visible in the preparation of lesson plans for pre-service mathematics teachers. Some teachers are not coherent in preparing lesson plans, due to lack of understanding of the usefulness of the lesson plans that are prepared. The findings of this study are that CT pre-service teachers can be classified into four types, namely full CT, less full CT, unfull CT, and non-CT. Suggestions or recommendations for further research are analyzing teachers who lack understanding about the preparation of the lesson plan, what the obstacles are, and how the solutions for it.
Reflective Thinking of Mathematics Prospective Teachers’ for Problem Solving
Authors: Kholid Muhammad Noor , Telasih Sekar , Pradana Lingga Nico , Maharani Swasti 
Published: February 2021

Abstract
Reflective thinking is a thinking activity marked by the appearance of confusion and efforts to overcome it through planned steps based on knowledge, experience, and problem-solving skills. Reflective thinkers involve specific skills to identify problems, examine, evaluate, formulate problems, and draw conclusions. There are three categories in reflective thinking, including clarification reflective thinking, connective reflective thinking, and productive reflective thinking. The difference lies in the way individuals deal with confusion. This research describes the reflective thinking process of mathematics prospective teachers in solving analytical geometry in term of plane content based on aspects of technique, monitoring, insight, conceptualization. The qualitative research employed prospective mathematics teacher in Java - Indonesia as research subjects. Data collection taken by using test techniques, field notes, interviews, and audio-visual recordings. The results showed that subjects with the category of clarification reflective thinking, connective reflective thinking, and productive reflective thinking did all four aspects even though not all indicators of each aspect. Thus, a training is necessary to develop mathematics prospective teachers’ reflective thinking.
Comic Mathematics: A bridge to understanding the concept of social arithmetic for secondary school students
Authors: Rose Nedia , Gunadi Farid , Rosyadi  , Nandang  , Sudirman  
Published: February 2021

Abstract
Several studies have concentrated on the development of mathematics comics that are used to help students understand mathematical ideas. There are still a handful, however, who create mathematics comics at the secondary school level on social arithmetical content. Therefore, this study aims to describe the development process in designing mathematics comics and to analyze their effectiveness in helping students understand the concept of social arithmetic. The process of developing mathematical comics in this study uses the Brog and Gall[1] stage by modifying it into 8 development stages, including (1) initial observation; (2) plans; (3) making products; (4) product validation test; (5) limited scale test; (6) small size research revision; (7) field testing; (8) field performance review. In addition, the field test was carried out in one of the VIII Grade Secondary Schools in Indramayu Regency, Indonesia, for students. Based on the results of the analysis, the mathematics comic design that had been created was properly checked by media experts and mathematics teaching content design and students after observing the characteristics of the material. The feasibility test results achieved an average score of 3.61 for the very feasible category, while the feasibility test results tested by the students in the limited scale test obtained an average score of 4.65 for the very feasible category. In comparison, based on the field test, the mean score of the comprehension of social arithmetic content by secondary school students was 19.43 from the mean score of the successful criterion 15. Based on the effects of the parametric statistical test, tobs= 14.89 and tk= 1.94 were obtained. It can also be concluded that the use of comics focused on mathematics learning is successful in helping to teach concepts of social arithmetic.
Analysis of Reflective Student Analogy Reasoning in Solving Geometry Problems
Authors: Pradita Diyah Ayu Rizki , Maswar Maswar , Tohir Mohammad , Junaidi Junaidi , Hadiyansah Dwi Nur 
Published: February 2021

Abstract
In math subjects, students must involve an analogy reasoning in solving geometry problems. Where students were required to use the ability of reasoning analogy which one of them in solving the building of curved side space (BRSL) with a previously studied concept was a flat building. The ability of reasoning analogy was thought to be influenced by the characteristics of students, that was cognitive style. The purpose of this study was to analyze the reasoning of analogies that reflective students had in solving geometry problems. The study was conducted on 27 students with varying cognitive styles. The research began with a Matching Familiar Figure Test (MFFT) to classify reflective cognitive styles, followed by the Mathematical Ability Test (TKM). Then one reflective student was selected at high-skilled, one moderate-skilled student, and one low-skilled student. Furthermore, a BRSL analogy reasoning test (TPABRSL) was conducted and concluded with an interview. Research shows that High Reflective Students (SRT) can pass through all stages of analogy reasoning, namely encoding, inferring, mapping, and applying. Meanwhile, Moderate Reflective Students (SRS) and Low Reflective Students (SRR) were unable to pass all stages of analogy reasoning appropriately due to errors in the use of existing concepts and procedures.
Effectiveness of E-Learning Approach to Contextual Teaching and Learning in Improving Students ′Ability
Authors: Azhar Zulfi , Suparno  , Rukun Kasman , Jama Jalius , Effendi Hansi , Muskhir Mukhlidi 
Published: February 2021

Abstract
In this study using a contextual teaching and learning approach to STMIK Royal Kisaran students. Class sampling consisted of class SI-5C using the CTL approach and class SI-5F using CTL and e-learning as an experimental group, while the class SI-5D used a conventional approach as a control group. Using the pretest and posttest in the form of multiple choice as instruments in artificial intelligence lectures. From the results of the tests carried out there are significant differences in students who are taught using the CTL and E-learning approaches and conventional approaches. Taking approaches of CTL and CTL & E-Learning to students is more effective than conventional ones. However, CTL is better than using the approach of CTL & E-Learning.
Face to Face Learning vs Blended Learning vs Online Learning (Student Perception of Learning)
Authors: Nasution Awal Kurnia Putra , Surbakti Andika Hariyanto , Zakaria Rahmanita , Wahyuningsih Sungkawati Kardi , Daulay Leni Agustina 
Published: February 2021

Abstract
The coronavirus covid19 pandemic crisis in Indonesia has caused all lectures to be conducted online (online learning), so that all students have experienced face to face learning, blended learning, and online learning. The purpose of this study is to determine student perceptions of learning, which learning is most preferred by students between face to face learning, blended learning, and online learning. The research method used is descriptive research with a quantitative approach. Respondents were 100 students of Islamic Religious Education study programs. The results showed that face to face learning was the most preferred choice by students of the Islamic Religious Education study Program in IAIN Takengon, which is 78 students or at 78%, while a total of 20 students or 20% of the study was done in blended learning, and only 2 students or 2% who chose online learning.