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International Conference on Science and Technology Applications (ICOSTA 2019)

Event starts on 2019.11.14 for 1 days in Medan

https://icosta.unimed.ac.id | https://ifory.id/conf-abstract/AJmzRnXr3

Page 3 (data 61 to 83 of 83) | Displayed ini 30 data/page

Static Fluid Material and self-efficacy to Improve Problem Solving Abilities
Yenni amalia siregar, Eva marlina ginting, Makmur sirait

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Corresponding Author
Yenni amalia Siregar

Institutions
UNIMED

Abstract
This study aims to determine: Problem solving skills with a static fluid material and self efficacy. The instrument used was a test students problem solving ability and self-efficacy tests in the form of a questionnaire. Data was analyzed using ANOVA two lanes. The results showed that the ability of solving problems with static fluid material and self efficacy of the experiment better than problem solving skills with a static fluid material and self efficacy in control with the average value of problem-solving abilities to the experiment of 65.66 while in control of 63.5, problem-solving ability have high self-efficacy is better than problem solving skills that have a low self-efficacy with an average value of self-efficacy high of 76.65 and a low of 47.00 in the experimental class. While in the control class average high self-efficacy of 65.00 and a low of 53.84, and there is interaction between the static fluid material and self efficacy in affecting the ability of problem solving.

Keywords
Fluid Static, Problem Solving Ability, Self Efficacy

Topic
Applied Basic Science and Multidisciplinary

Link: https://ifory.id/abstract/9FeaVjbRkuqf


STRATEGIC DEVELOPMENT PLAN FOR MICE DESTINATIONS TO INCREASE COMPETITIVENESS USING THE COOPER METHOD
Nursiah Fitri

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Corresponding Author
Nursiah Fitri

Institutions
Study Program Management Business, Administration Business Department, Politeknik Negeri Medan POLITEKNIK NEGERI MEDAN
Jl. Almamater No. 1 Kampus USU Medan 20155, Indonesia

Abstract
The purpose of this research is to understand the conditions of attributes of MICE destinations in Medan City and strategic development plan for MICE destinations to increase competitiveness using the Cooper method approach in Medan City. This research is conducted using quantitative survey method. Questionnaire and interview are carried out as the data collecting method. The population of this research are the government stakeholders, which are represented by Medan City Tourism Office, and MICE industry entrepreneurs. The sampling technique is conducted by choosing the appropriate respondents which fit the sample criteria. Gap analysis is used as the data analysis method. The outcome of this research shows that the perceptions of the government stakeholders regarding the attribute of MICE are higher compared to those of the MICE industry entrepreneurs. Only the attribute of amenities has low gap, with the value of -0.1. The attribute of attraction possesses the highest gap value. Therefore, it is important for the government to increase the attribute of attraction which includes everything that can be shown to the tourists whether it is culture, natural richesse, or man-made attractions of Medan City to increase the level of competitiveness of Medan City as a tourism destination.

Keywords
Stratregy, Destination, MICE

Topic
Fundamental and Applied Sciences

Link: https://ifory.id/abstract/n7qxNQj926PV


Sustainable solid waste management in Jambi: challenges and practices against culture
M. Hasbi Ashshidiqi (a), Khairun Najib (a), Syukrya Ningsih (a*)

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Corresponding Author
Syukrya Ningsih

Institutions
(a) UIN Sulthan Thaha Saifuddin Jambi
Jl. Jambi-Ma.Bulian km.16 Simp. Sei. Duren
Kabupaten Muaro Jambi Provinsi Jambi
*syukryaningsih[at]uinjambi.ac.id

Abstract
The relationship between culture and waste recycling has been determined, to provide an estimate of the possible impact of cultural participation on household behavior in the sustainability meta-issue. Percentage of wastewater management methods in Jambi Province is known that waste management is still dominated by burning 60.5%, transported by officers as much as 18.4%, discharged into rivers or sea as much as 11.2%, buried in soil 6%, 3.7% removed and only 0.3% compost. We use data on household behavior to highlight the determinants of recycling of waste with culture. This analysis highlights a strong positive relationship between the tendency to take part in several cultural activities and the tendency to adhere to guidelines and recipes for waste recycling. Our empirical results suggest that policies aimed at influencing sustainable development by encouraging pro-environment behavior may be more effective when considering dimensions of cultural participation as complementary factors.

Keywords
Waste Recycling; Culture; sustainability.

Topic
Applied Basic Science and Multidisciplinary

Link: https://ifory.id/abstract/WqrH9jZaT7PM


Swing Reactivity Calculation of Accelerator Driven System Subcritical Reactor 100 MWth
Sudarmono (a*), Suwoto (a), A. Rohanda (a), EP.Hastuti (a),Y.Kasezas (b)

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Corresponding Author
sudarmono sudarmono

Institutions
a) Center for Nuclear Reactor Technology and Safety, Bld 80 PUSPIPTEK Area, Serpong,
South Tangerang, 15310, Indonesia
*aksel[at]batan.go.id
b) Reactor and Nuclear Safety Research School, Nuclear Science and Technology Research Institute (NSTRl), Tehran, Iran

Abstract
Accelerator driven system, ADS, applied subcritical reactor which can effectively transmute plutonium, minor actinide, and thorium as nuclear waste. In order to lower the amount of nuclear waste sent to the geological repository, an optimized scattered reloading scheme for ADS is proposed to maximize the discharge burnup and lower the reactivity loss. Accelerator Driven System lead store reduce of the amount of the Pu and Th, so it is not only can create the addition of energy source, but also high safety reactor. The fuel used in this reactor is obtained from LWRs spent fuel and thorium-based fuel. The use of thorium-based fuel can lower keff of the core and generates U233, which is a nuclear fuel for critical reactor. Neutron obtained from spallation reaction of PbBi target is placed in the center of the core. This ADS design produces subcritical keff during the operation of the reactor and can decrease the amount of fission products of LWRs spent fuel and produce U233. The objective of the calculation are criticality as a function of burnup in the subcritical assembly fuel. This ADS fuel is originated from UO2 PWR spent fuel with enrichment of 3.4 % and burnup level 64 GWD or 100 MWt for 1825 days calculation of accelerator driven system subcritical reactor 100 MWth has been performed. This research done by using ORIGEN2.1, SRAC2006 and MCNP6 Code. Based on the results swing reactivity of the calculation by using ORIGEN2.1 Code, indicates that keff whose value be low subcritical condition. The calculation using SRAC2006 Code indicates that at the beginning of life, BOL, the keff of ADS design with 50 cm thickness is 0.9821491 and at the end of life, EOL, keff is 0,9396284 and the calculation by using MCNP6 Code. At beginning of life, BOL, the keff of ADS design is 0.9847 and the end of life is 0.9823. The presence of plutonium and mayor actinides makes keff get slightly lower. Arrangement at this ADS model is performed to produce subcritical condition, in which an increase in fuel volume cause keff higher than 1.

Keywords
Swing reactivity, ADS, ORIGEN2.l, MCNP6, SRAC2006

Topic
Computer Applications and Information Sciences

Link: https://ifory.id/abstract/DxR7zCnwjJTV


Syntesis Conductive Polymer from Polypirrole (PPy) Based Assisted by Polyvinyl Alcohol (PVA) Through Batch Polymerization Process
M A Elita Hafizah (a), F Kissinger (a), A manaf (a*), Suparno (a) and Andreas (b)

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Corresponding Author
Muhammad Freddy Kissinger

Institutions
a) Postgraduate Program of Materials Science, Faculty of Mathematics and Natural Science, Universitas Indonesia, Jl. Salemba Raya No.4, Jakarta 10430, Indonesia
*azwar[at]ui.ac.id

b) Indonesian Institute of Sciences, LIPI, Komplek PUSPITEK, Serpong, Banten 15314, Indonesia

Abstract
Polypirrole (PPy) is one of conductive polymer material has been success sinthesized through polymerization process using chemical oxidative reaction by batch polymerization technique. The synthesis was conducted at room temperatur with agitation speed within 300-500 rpm. The certain amount of pirolle monomer was reacted with ammonium persulphate in the aquaeous media. Demineralized water is the only one solvent was involved in the reaction. The presence of 0%, 1%, 2% and 3% of Polyvinil alcohol (PVA) in the synthesis of PPy was investigated. Washing process found maximal after four times washing indicated by FTIR spectrum, phisical appearance, color and conductivity value of the filtrate of residual washing treatment. While the syntheiszed PPy with presence of PVA obtained higher conductivity compare when PVA free. The conductivity value was 57,000 , 56,000 us/cm for additional 1% and 2% of PVA respectively. It is significantly increased when PVA free involved in the reaction. Other supporting characterization during synthesis was conducted such as pH measurement, density, viscosity, temperature and colour degradation observation. The appearance of PPy when presence PVA is being emulsion and different when absence of PVA which obtained powder or solid form of PPy. Black polymer emulsion with various viscosity of PPy was observed completely.

Keywords
Polypirrole; Conductive polymer; Polyvinil alcohol; Batch polymerization

Topic
Material Science and Engineering

Link: https://ifory.id/abstract/Kq9U2pAfQZHL


Synthesis of Calcium Phosphate Compound from Paddy Field Snail Shells (Pila Ampullacea) as Calcium Precursor
Kiagus Dahlan(a,b), Dina Yauma Asra(a*) Bayu Chandra Winata(a)

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Corresponding Author
Dina Yauma Asra

Institutions
a)Department of Physics, IPB University, Bogor, 16680, Indonesia

b)Advanced Research Laboratory, IPB University, Bogor, 16680, Indonesia

Abstract
Hydroxyapatite (HA) is a biomaterial that is widely used for bone implantation because it is bioactive and biocompatible. To improve the bioactive and biocompatible properties of hydroxyapatite, natural ingredients are used as a calcium source. In this study, the material used for calcium source is from paddy field snail shells. Snail shells produced from the process of boiling, cleaning, and drying calcined at a temperature of 800C for 3 hours to obtain the powders. Calcium phase and calcium content of the powder was identified using x-ray diffractometer (XRD) and atomic absorption spectroscopy (AAS). The results of the analysis showed that the calcium phase of the snail shell is Ca(OH)2 with calcium content of 52.12%. Synthesis of HA was carried out by precipitation method at 75C by dripping H3PO4 into calcium solution and continued with two treatments, with and without sintering process. The powders were then characterized by XRD and FTIR. The results of the analysis showed that HA formed in samples that using sintering process and carbonate apatite appears in samples without sintering process.

Keywords
Biomaterial, Hydroxyapatite, Snail shells, XRD

Topic
Material Science and Engineering

Link: https://ifory.id/abstract/LqUxKRNJkdF6


The Ability of Pineapple Callus Regeneration (Ananas comosus L.) from Sipahutar North Sumatra Indonesia With In Vitro Culture
Fauziyah Harahap (1*), Nikmatul K Harahap (1), Ely Djulia (1), Dirga Purnama (1), Herbert Sipahutar (1), Rosmayati (2), Suci Rahayu (2), Periseuein F Zega (1), Rifa Fadhilah Munifah Hasibuan(3)

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Corresponding Author
FAUZIYAH HARAHAP

Institutions
1Department of Biology, Faculty of Mathematics and Natural Sciences, Medan State University, Jl. Williem Iskandar Pasar V Medan Estate, Medan, 20221, Indonesia
2 Department of Biology, Faculty of Mathematics and Natural Sciences, University of North Sumatera, Jalan Biotechnology No.1, USU Campus Medan, 20155, Indonesia
3Department of Agronomy and Horticulture, Faculty of Agriculture, Agriculture University, Bogor, Indonesia.

Abstract
Pineapple (Ananas comosus L.) from Sipahutar is an herbaceous plant from Sipahutar District. Pineapple canning industry sourced from Sipahutar pineapple has the opportunity to be developed in North Sumatra. Propagation through in vitro culture is an alternative method to solve this problem. The purpose of this research was to determine the regeneration ability of pineapple callus derived from callus induction with the addition of 2,4-D 1 ppm and BAP 1 ppm. The callus were regenerated using the addition of Kinetin (0; 0.5; 1; 1.5 ppm). Each treatment was carried out 4 times. The results showed: 1) the fastest time of emergence of shoots (5 days) came from 0.5 ppm, 2) formed the most shoots (8 shoots) resulting from the addition 0 ppm and 0.5 ppm, 3) the most number of leaves (7.75 leaves) resulted from light treatment with the addition kinetin 0.5 ppm and 1 ppm, 4) the longest leaf length (4.44 cm) from dark treatment with kinetin 0.5 ppm, 5) the highest plant height (5.32 cm) from dark treatment with 0.5 ppm kinetin. This shows that the concentration of 0.5 ppm kinetin with the dark treatment is the best concentration to stimulate the formation of pineapple shoots.

Keywords
Pineapple, kinetin, regeneration, in vitro

Topic
Biochemistry, Biotechnology and Pharmacy

Link: https://ifory.id/abstract/8ZbRrwVtAPXQ


The Active Hybrid Solar Panel integrated with Fresnel Lens Concentrator
Widyaningrum Indrasari, Riser Fahdiran, Umiatin, Habiburosid

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Corresponding Author
Widyaningrum Indrasari

Institutions
Department of Physics, Faculty of Mathematics and Science, Universitas Negeri Jakarta

Abstract
Prototype of a hybrid solar panel with a Fresnel lens concentrator and a solar tracking system has been developed in this research. This hybrid solar panels are a combination of conventional solar cells and thermoelectric generators. Solar cells work to convert solar radiation, whereas thermoelectric generator converts solar heat into electrical energy. A Fresnel lens, a refractive lens type, is used as a solar concentrator, whereas the solar drive system uses solar azimuth data. This prototype is equipped by INA219 sensor as a measure of electric current and the output voltage of solar panels. The temperature gauge uses a DS18B20 sensor, and the GY 49 MAX44009 light sensor is a light intensity detector. Solar panel drive uses MG995 servo motor and RTC module. Measured parameters are stored in the Secure Digital (SD Card) module. Through optimization, the obtained tilt angle of the solar panel is 10 degree. Meanwhile, the optimized distance of the Fresnel lens to the solar panel is 0.2 F. The addition of Fresnel lens resulted increasing of the output power of hybrid solar panel, there is 9.1 percent in the Sawah Lama-Tangerang Selatan area, and 23.83 percent in the Rawamangun - East Jakarta area.

Keywords
hybrid solar panel, Fresnel lens,concentrator, thermoelectric

Topic
Applied Basic Science and Multidisciplinary

Link: https://ifory.id/abstract/LFev94Upnxwb


THE BASIC ACID SCIENTIFIC EXPERIMENT VIDEO AND THE SEPARATION OF MIXED-BASED INFORMATION TECHNOLOGY
Syahfitriani Ginting, Sahyar Sahyar, Ajat Sudrajat

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Corresponding Author
Syahfitriani Ginting

Institutions
Postgraduate School Universitas Negeri Medan

Abstract
This research results in a video of scientific experiments worthy of use, resulting in a video of scientific experimentation that is practical to use. The video is a video-based scientific experiment and a mixture of information technology. The development model in the study uses the Borg & Gall development model which is adapted into a simple model. The results showed the validation of material experts with very decent categories, media experts with very decent categories, small group tests with very practical categories, and field trials with categories very practical.

Keywords
video Experiment, Scientific, Tecnology Information

Topic
Multimedia and Technology Information

Link: https://ifory.id/abstract/FvCNEmpfAkTP


The Constrains of Green Building Implementation in Indonesia
Sahid, Yeti Sumiyati, Rahma Purisari

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Corresponding Author
Sahid Mochtar

Institutions
Universitas Pembangunan Jaya
Universitas Islam Bandung

Abstract
Various evidence on the success of green building concepts, particularly passive strategies, in saving energy use and reducing environmental impacts has been widely shared in various scientific and popular media. The information is not only about theoretical but also best practice of green building implementation, including information about the addition of investment value, savings and profit earned on the operation. The government and the private sector have also encouraged the acceleration of its implementation through the establishment of regulations and rating tools that regulate liabilities and appeals for property industry actors to participate in implementing passive strategies as part of the implementation of green building concepts. This study aims to find out the obstacles of green building implementation through policy review and also questionnaires and interviews to stakee holders. Apparently, the policy system is still need to be completed in order to manage and control the building and also the stake holders to implement the green bulding concept.

Keywords
Policy, Regulation, Green Building, Indonesia

Topic
Applied Basic Science and Multidisciplinary

Link: https://ifory.id/abstract/Gup9vNUxRqEQ


The Design of Video Technology Based on Scientific Experimental for Geometrical Optics Subject as ICT Implementation
Fitri Ramadani, Sahyar, Juniastel Rajagukguk

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Corresponding Author
Fitri Ramadani

Institutions
UNIMED

Abstract
This research aims to produce media learning in the form of experimental video on the geometrical optics that meets good qualifications which include aspects of validity, practicality and improving learning outcomes. This research is a type of research and development Research and Development (R&D) with the Borg and Gall model. Development of videos on research on reflection and refraction using applications, which will later produce an experimental video on physics learning in schools to improve student learning outcomes.

Keywords
ICT, experimental video, reflection and refraction

Topic
Fundamental and Applied Sciences

Link: https://ifory.id/abstract/kbthwY38UaLZ


THE DEVELOPMENT OF MATHEMATICS LESSON EQUIPMENT BASED ON MODEL ELICITING ACTIVITIES (MEAs) APPROACH TO IMPROVE MATHEMATICAL REASONING SKILL OF STUDENTS CLASS X OF SENIOR HIGH SCHOOL PADANG (Study of Preliminary Analysis)
Irwan, Sri Elniati

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Corresponding Author
Irwan Irwan

Institutions
Universities Negeri Padang

Abstract
Mathematical reasoning skill of students from several schools was still not optimal yet. One of ways to solve this problem was by developing mathematics lesson equipment based on Model Eliciting Activities (MEAs) approach. This research was development research, which aimed to produce lesson equipment based on Model Eliciting Activities (MEAs) approach. From results of preliminary analysis, it was found the lesson equipment that was in accordance with students characteristics and used curriculum as well as the order of the content based on the result of concept analysis. This learning equipment would have the role in improving students mathematical reasoning skill.

Keywords
Model Eliciting Activities (MEAs) approach, lesson equipment, mathematical reasoning skill

Topic
Applied Mathematics and statistics

Link: https://ifory.id/abstract/Z2TBw8KfRxub


The Effect of a combination of growing media and biological agents to control bacterial wilt disease of potato(Ralstonia solanacearum) in greenhouse
Mukhtar Iskandar Pinem, Lahmuddin Lubis, Marheni, Dedi Maradi Zuhdi

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Corresponding Author
MUKHTAR ISKANDAR PINEM

Institutions
UNIVERSITY OF SUMATERA UTARA

Abstract
Potato (Solanum tuberosum L.) in Indonesia is a commodity that priorities to developed, and has the potential to be marketed in the domestic as well as export . One of the obstacles is important that faced is pathogen soil-borne which is caused by the Ralstonia solanacearum. This pathogen can causing loss of yield of potato 40-100%. Bacillus sp. and P. fluorescens are antagonistic microbes that are proven to be able to control bacterial wilt disease (R. solanacearum) by 69,95 % and 61,67%. This study aimed to determine the effect of the comparison composition of growing media and the ability of some agents of biological within suppress the growth of the disease wilt bacteria of potatoes which is caused by R. solanacearum . This research using completely randomized design (CRD) nonfaktorial with 10 treatments, namely: M0(top soil), M1(top soil, R. solanacearum), M2(top soil, R. solanacearum, P. fluorescens), M3(top soil, R. solanacearum, Bacillus subtilis), M4 until M9 are combination of them. The results showed that the application of biological agents was able to suppress the growth of the pathogen R. solanacearum, as well as significantly affect plant height, number of shoots, and production.

Keywords
potato, R. solaanacearum, P. fluorescens, B. subtilis

Topic
Biochemistry, Biotechnology and Pharmacy

Link: https://ifory.id/abstract/qDRbfA4eVwky


The Effect of Ab mix Nutrient on Growth and Yield of Pak choi (Brassica chinensis L.) Plants under Hydroponic Wick System Condition
Miftah A Harahap (1), Fauziyah Harahap (2*), and Tumiur Gultom (2)

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Corresponding Author
MIFTAH ARINA HARAHAP

Institutions
1) Biology Education of Postgraduate School Universitas Negeri Medan, Jalan Willem Iskandar Psr V Medan Estate, North Sumatra 20221, Indonesia.
2) Department of Biology, Faculty of Mathematics and Natural Sciences Universitas Negeri Medan, Jalan Willem Iskandar Psr V Medan Estate, North Sumatra 20221, Indonesia.
*fauziyahharahap[at]gmail.com

Abstract
This research was conducted to find out the effect of ab mix nutrient on growth and yield of Pak choi (Brassica chinensis L.) plants under hydroponic wick system condition. The experiment was conducted in non factorial completely randomized design (CRD), 3 replications of five levels concentration of ab mix (0, 650, 1300, 1950, 2600 ppm). Each replication consist of 6 plants, therefore there were 90 plants observed. The parameters observed were plants height, number of leaves and width, fresh and dry weight, harvest index, and root volume. Data was analyzed by using one way ANOVA, and DMRT as follow up. The result showed effect of ab mix on 1) plants height, 2) number of leaves 3) leaf width 4) fresh weight 5) dry weight 6) harvest index, but none on root volume. The best ab mix concentration for parameters of number of leaves (18.78 leaves), leaf width (47.32cm2), fresh weight (33.57gr), dry weight (2.40gr) and harvest index (99.15percent) was in 1950 ppm. The best ab mix concentration for parameters of plants height (8.71cm) was in 2600 ppm.

Keywords
ab mix, hydroponic, nutrient, pak choi, wick system

Topic
Biochemistry, Biotechnology and Pharmacy

Link: https://ifory.id/abstract/6e2AvrDxqmHN


The effect of competing cation on zinc adsorption in acid mine drainage using synthesized zeolite and its desorption study
Amalia Ekaputri Hidayat, Setyo Sarwanto Moersidik*

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Corresponding Author
Amalia Ekaputri Hidayat

Institutions
Environmental Engineering Study Program, Civil Engineering Department, University of Indonesia
*Corresponding author: ssarwanto[at]eng.ui.ac.id

Abstract
Acid mine drainage (AMD) is one of the by-product from coal and mineral mining. AMD can terminally impair waterways and contaminate the water quality due to its acid characteristic and its high concentration of trace metal ions including iron, manganese, zinc, and copper. The aim of this research is to investigate the effect of competing cation in acid mine drainage on zinc adsorption using synthesized zeolite from coal fly ash. The adsorption study was conducted using batch method in synthetic AMD, which contain zinc as the primer ion and iron, manganese, copper as competing ions. The desorption study was also carried out in this study, using eluents such as, H2SO4, HNO3, and NaCl. The removal efficiency of zinc was reduced significantly with the present of other metal ions. The desorption study shown that the acidic eluents tend to destruct the synthesized zeolite, while the desorption efficiency in eluent such as NaCl was not significant either. Further research is needed to investigate more about the eluent that fit the adsorbent, the desorption time, or consider other method for the regeneration of the adsorbent.

Keywords
adsorption, desorption, acid mine drainage, zeolite

Topic
Applied Basic Science and Multidisciplinary

Link: https://ifory.id/abstract/jkLV87fPaA4G


The Effect of Inquiry-Based Learning Method on Senior High School Students Conceptual Understanding of Heat and Scientific Process Skills
solikin, derlina, nurdin bukit

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Corresponding Author
solikin solikin

Institutions
Prodi Pendidikan Fisika Pasca Sarjana Unimed

Abstract
This study aims to analyze the differences: (1) the conceptual understanding of students taught with inquiry-based learning method and conventional learning, (2) the scientific process skills of students taught with inquiry-based learning method and conventional one. This research employed a quasi experimental method. The population of study was XI grade student of SMA Al Fityan Medan. The sample was chosen randomly. The instrument used in this research were multiple choice questions and observation sheet. multiple choice questions were used to analyzed students conceptual understanding, while observation sheet were used to investigate students scientific process skills. The data of this research were analyzed using independent sample t-test. the results of this study showed a significant difference, that can be conclude as bellow: (1) the conceptual understanding of students taught with inquiry-based learning method are better than the students taught with conventional learning, (2) the scientific process skills of students taught with inquiry-based learning method are better than the students taught with conventional learning.

Keywords

Topic
Fundamental and Applied Sciences

Link: https://ifory.id/abstract/Cm4TzcjQEgvk


The Effect Of Learning Models and Cognitif Style on Geography Learning Outcomes in Senior Higt School Percut Sei Tuan 2
zuilen Van Boy Sinaga; Prof.Dr. Abdul Hamid K, M.Pd; Dr.Sugiharto, M.Si

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Corresponding Author
ZUILEN VAN BOY SINAGA

Institutions
Universitas Negeri Medan

Abstract
This study aims to: (1) Know the learning outcomes of students who are learning gography learning with problem based learning models and STAD learning models (2) to find out the geography learning outcomes of students who have independent cognitive styles, and dependent cognitive styles (3) know the interactions between learning models with cognitive styles in influencing student learning outcomes in geography. This research is a quasi-experimental research. Student learning outcomes taught by the problem based learning model are higher than students who are taught with the STAD learning model

Keywords
learning model, problem based learnig model learning, STAD learning model, cognitive style and learning Outcomes

Topic
Applied Basic Science and Multidisciplinary

Link: https://ifory.id/abstract/LCyF39Hzv6Bf


The Effect of Service Quality toward Customer Satisfaction of Go-Jek Online Transportation: A Case Study of Students at Syiah Kuala University, Indonesia
Amiruddin*, Nazaruddin, T.M. Jamil, Yessi Hajri Andika

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Corresponding Author
Amiruddin Amiruddin

Institutions
Department of Economics Education, Universitas Syiah Kuala, Indonesia

Abstract
This study aimed to determine the service quality and customer satisfaction of GO-JEK online transportation. This research used quantitative descriptive methods. After doing the literature and field reviews, the data in this study collected through questionnaires totaling 86 respondents. The sampling technique in this study used the incidental sampling technique. Data analysis techniques used were simple linear regression, correlation coefficient, determination, t-test to test and prove the research hypothesis. Based on the results of data analysis, the results of the study showed correlation 0.634, which means the strong correlation between variables of service quality with customer satisfaction variables. The coefficient of determination showed the effect of service quality on customer satisfaction of 0.796 or 79.6%. Furthermore, the t-test at the 5% significance level of the hypothesis was accepted, evidenced by the probability value. The conclusion from this study is that there is an influence between service quality and customer satisfaction. If the service quality provided is good, it will create customer satisfaction.

Keywords
service quality, customer satisfaction, Go-Jek, online transportation services

Topic
Multimedia and Technology Information

Link: https://ifory.id/abstract/z8tMFnNRyZub


The Effectiveness Of Natural Science Modules Based On Guided Inquiry Method In Elementary School Learning
Fitri Yani1, Nurdin Bukit2, Sondang R. Manurung3

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Corresponding Author
Fitri Yani

Institutions
1(Basic Education Program, Post Graduate, State University of Medan, Medan, Indonesia)
Email: fitriyani651[at]ymail.com
2(Departement of Physics, State University of Medan, Medan, Indonesia)
3(Departement of Physics, State University of Medan, Medan, Indonesia)

Abstract
This research is kind of development research (Research and Development) which aims to determine the effectiveness of natural science modules based on guided inquiry method that is developed. The development of natural science modules use ADDIE theory (Analyze, Design, Development, Implementation, and Evaluation). Analyzing data using descriptive qualitative technique that expressed in students score and score scale category. This development research produces products that meet the eligibility requirements with the results of the validation of the material declared very effectivity and the designer is effective and the linguist is declared suitable at this theory. The results are students give a good response of natural science module based on guided inquiry method while the teacher gives a good response on it and the method is effective.

Keywords
Module, Guided inkuiri, Model ADDIE

Topic
Multimedia and Technology Information

Link: https://ifory.id/abstract/hrJybL8N2CWf


The Effects of Mass Variation Potasium Chloride on Characteristic Nanosilicone from Natural Sand Through the Magnesiothermic
Rizky Agusman (a), Andriayani (b*)

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Corresponding Author
Andriayani Andriayani

Institutions
a) Student of Departmen Chemistry, Faculty Mathematics and Natural Science, Universitas Sumatera Utara
b) Department of Chemistry, Faculty Mathematics and Natural Science, Universitas Sumatera Utara
Jl. Bioteknologi No 1, Kampus USU, Medan 20155, Indonesia
*andriayani[at]usu.ac.id

Abstract
Synthesis of nanosilicone has been carried out from natural sand with magnesiothermic method. Silica from natural sand was extracted by sodium hydroxide 10 N and hydrochloride acid 6N. Ultrasonication of silica with potasium chloride has been done with ratio of SiO2:KCl (1:7.5 and 1:12.5). Silica converted to silicone by magnesiothermic methode with ratio SiO2:Mg = 1:2, heated up to 800 C for 6 h. Nanosilicone was purified with deionized water and ethanol, HCl 5 N and HF 10%. The result of XRD analysis of nanosilicone of ratio SiO2: KCl (1:7.5 and 1: 12.5) each 88.8% and 73.0%. The disrtibution of particle size wer 28.56 nm - 170.57 nm and 12.70 nm -93.32 nm. Photo SEM Of particle nanosilicone shows a pore and agglomeration.

Keywords
Potassium chloride; magnesiothermic; nanosilicone; natural sand; ultrasonication

Topic
Nanoscience and Nano-material applications

Link: https://ifory.id/abstract/72YWp84fneQT


THE EFFECTS OF SODIUM HIDROXIDE CONCENTRATIONS ON SYNTHESIS OF CARBOXYMETHYL CELLULOSE FROM NATA DE COCO
Nurfajriani(a*), Nurdin Bukit(b), Monika DesideriaTampubolon(c), Ahmad Nasir Pulungan(a)

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Corresponding Author
Nurfajriani Nurfajriani

Institutions
(a)Department of Chemistry, Universitas Negeri Medan, Jl. Willem Iskandar Pasar V Medan Estate, Medan, Indonesia, 20221
*nurfajriani[at]unimed.ac.id
(b)Department of Physic, Universitas Negeri Medan, Jl. Willem Iskandar Pasar V Medan Estate, Medan, Indonesia, 20221
(c)Fresh graduated, 1Department of Chemistry, Universitas Negeri Medan, Jl. Willem Iskandar Pasar V Medan Estate, Medan, Indonesia, 20221

Abstract
The aim of this investigation was to create Carboxymethyl Cellulose (CMC) from the nata de coco cellulose. The nata de coco was produced by fermentation method of coconut water used acetobacter xylinum. Bacterial cellulose (BC) was isolated by furification nata de coco with 1% NaOH and 1% asetic acid solutions resfectively. In the process of making CMC, dried BC was immersed in isopropanol medium, then alkalised with 10%, 15% and 20% NaOH solutions respectively for 1 hour at a temperature of 55 oC. Then BC reacted with 18 grams of chloroacetic acid. FTIR analysis results show that CMC was successfully synthesized from BC. The increase in NaOH concentrations in the CMC preparation caused an increase in the degree of substitution (DS). DS is one of the main parameters of the success of the CMC synthesis process from the initial raw material for cellulose. At a concentration of 20% NaOH, the resulting CMC synthesized with DS 0.743 was better than 10% NaOH with DS 0.371.

Keywords
nata de coco; acetobacter xylinum; bacterial cellulose; carboxymethyl cellulose; degree of substitution

Topic
Material Science and Engineering

Link: https://ifory.id/abstract/3T9jv7eapGBW


The profile of Pempek as a determining factor of quality, originality and ethnicity
Agus Supriadi (a,d), Daniel Saputra (b*), Gatot Priyanto (c), Ace Baehaki (d), Rindit Pambayun (c)

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Corresponding Author
Daniel Saputra

Institutions
a) Ph.D. Graduate Student of Agricultural Sciences, Faculty of Agriculture, Universitas Sriwijaya
b) Agricultural Engineering Study Program, Faculty of Agriculture, Universitas Sriwijaya
* drdsaputra[at]unsri.ac.id
c) Agricultural Product Technology Study Program, Faculty of Agriculture, Universitas Sriwijaya
d) Fishery Product Technology Study Program, Faculty of Agriculture, Universitas Sriwijaya, Indonesia
*Coresponding author: drdsaputra[at]unsri.ac.id

Abstract
Pempek is a traditional ethnic food originated from Palembang, South Sumatra, Indonesia. Currently, there is not exist any profiles which could be used as a determining factor for quality, originality, and ethnicity of pempek. The objective of this research was to obtain the chemical profile of pempek as a determining factor of quality, originality and ethnicity. The samples were collected from the ten famous branded vendors in Palembang. The fish used in making pempek of the samples are snake head fish, Spanish mackerel, and the mix of snake head and Spanish mackerel. The type of pempek used in this experiment was steamed cook pempek lenjer (cylindrical) type. The analysis was performed at a KAN accredited laboratory. It was found that the energy content of pempek used in this experiment was in the range of 125 to 160 kkal/100 g sample and all the pempek used had a 0% of fat. All pempek used had 17 types of amino acid, and all of them had an essential amino acid. The significant finding was that the concentration of glutamic acid was 200% of the concentration of common concentration which indicated that all the vendors used artificial mono-sodium glutamate to improve the taste of pempek. The analysis of color show that the color of pempek is a bright yellow with a little greenish. All pempek contained the mineral Ca+, Na+, and Fe+ in the various degree. Out of texture variables measured: hardness, adhesiveness, cohesiveness, springiness, gumminess, and chewiness it was found out that pempek only had the significant parameter of hardness, springiness, and gumminess. The type of fish used and the art of making pempek gave a different external surface profile which was measured with the help of Scanning Electron Microscopy. It was concluded that the chemical and physical profile found on this research could be used as database for creating a standard of identity of pempek.

Keywords
pempek, profile, standard of identity

Topic
Applied Basic Science and Multidisciplinary

Link: https://ifory.id/abstract/CXbVFPfD3jHY


Video Technology Media based on Heat and Temperature to Improve of Learner Critical Thingking
Latifah Hanum Anas (a*), Juniastel Rajagukguk (b), Wawan Bunawan (c)

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Corresponding Author
Latifah Hanum Anas

Institutions
Department of Physic Education, Postgraduate of State University of Medan

Abstract
Science and technology advances provide space for teachers to be able to create a variety of learning media that can be used in the learning process This study is aimes to determined the process of implementation of learning and improvement of students learning critical thingking with video technology media based on heat and temperature at class XI MIPA of MAN Serdang Bedagai. Video technology media based on heat temperature is a form of learning media that can accommodate student learning needs in accordance with the critical thingking of students. The method is quasi experimental type of research while subject of this research are students of class XI MIPA 1 dan XI MIPA 2 academic year 2019 / 2020 which consist of 60 students. Data collection techniques is test with the instrument of written test of essay that consist of 15 questions. The stages in this research are preliminary study, video design, research implementation and conclusions.

Keywords
Video Technology Media, Heat and Temperature, Critical Thingking

Topic
Applied Basic Science and Multidisciplinary

Link: https://ifory.id/abstract/PbQ3LAXNDhrF


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