Indonesia Conference Directory

Corresponding Author
rohman dijaya

Institutions
Universitas Muhammadiyah Sidoarjo

Abstract
UMSIDA Eprints is a repository of student and lecturer publication documents at the Muhammadiyah Sidoarjo University (UMSIDA). The collection of documents is still random and the search can only detect from the title keywords. The increasing culture of writing and research makes it possible for more and more documents as literature. Documents in Eprints are grouped by subject provided by the repository manager and grouped by the admin who uploaded the document. Automatic document grouping can be done by grouping documents based on the contents of the document using the Information Retrieval (IR) approach. The retrieval process is carried out by document processing with tokenization to obtain data tokens, the data tokens are processed through a stemming process to obtain the stem value of each word. The stem value is processed using the indexing process and word stem to get sentence indexes through the weighting process. The index results stored in the database become document variables that are the features or characteristics of each document. The index of all documents is grouped through the Kmeans Genetic Algorithm (GA-Kmeans) by determining the similarity of the document or the proximity of the centroid with the index of each data. The cluster data will be in accordance with the groups grouped from the closest distance to the cluster.

Keywords
Automatic Optimation,Eprints,Genetic Algorithm, Index, Information Retreival

Topic
Computer Science

Link: https://ifory.id/abstract/vB3XDFuKnErV

Corresponding Author
Yulilina Retno

Institutions
Universitas Negeri Jakarta
email: yulilinaretno[at]yahoo.co.id

Abstract
The main gynecological problems among women, especially adolescents, are disorders of the menstrual cycle. Menstruation is the decay of the uterine wall which causes bleeding that is influenced by hormones, occurs repeatedly and forms cycles. The menstrual cycle is influenced by hormonal, psychological factors such as anxiety, depression, and stress, and lifestyle such as nutrition and physical activity. This study aims to determine the positive relationship between physical activity and the menstrual cycle in female college students of Biology, Jakarta State University. The study was conducted at the Jakarta State University in October-November 2018. The method used was descriptive method with correlational studies. The number of research samples is 177 female college students. The prerequisite test results show that data were normally distributed and homogeneous. The results of hypothesis testing indicate there is a positive relationship between physical activity and the menstrual cycle, physical activity provides a considerable contribution to the menstrual cycle. The conclusion of this study is that there is a positive relationship between physical activity and the menstrual cycle.

Keywords
college student, menstrual cycle, physical activity

Topic
Biology

Link: https://ifory.id/abstract/e4ZUN8WqxrvB

Corresponding Author
Rositha Mujica

Institutions
Department of Architecture Education
Faculty of Vocational and Engineering Education,
Universitas Pendidikan Indonesia
Jalan Setiabudhi 229, Bandung 40154, Indonesia

Abstract
This research based by Engineering Drawing subjects which carried out in two different rooms so that have different learning comfort. Manual drawing studio was once a room for chemical laboratorium, judging from the physical condition of this drawing studio has less natural lighting so it requires additional or artificial lighting that comes from the lamps in the room. General classroom that should not be a place for practical learning such as engineering drawing subject is an option because the number of drawing studio is less. The study uses a quantitative approach with a type of descriptive research. Respondents from this study were class X Design Model and Information Building (DPIB) 3 and X DPIB 5 SMK 6 Bandung, amounting to 60 people. Data collection techniques using questionnaires and observation instruments. Based on the results of the research that has been done, it can be seen that condition of the classroom can explain learning convenience by 63.9% in DPIB 3. The details of the class condition variables are 73.3%, mostly students feel good. Variable convenience of learning is 46.67%, mostly students feel comfortable. In DPIB 5, 34.6% of class conditions can affect learning comfort. The details of 43.3% of the mostly students in class condition variables feel bad. 46.67% of mostly students on comfort variable in learning feel uncomfortable.

Keywords
architecture; education; thermal comfort; high school; learning

Topic
Architecture

Link: https://ifory.id/abstract/PKzdRyZ3GhQe

Corresponding Author
Nisa Rahmaniyah Utami

Institutions
Universitas Pendidikan Indonesia

Abstract
The background of this research is students who are less interested in the theory of making cakes, gateuxes, and tortenes. Students prefer and understand practice. The students feel bored in the theory of making cakes, gateux and torten, because there are many things students have to learn and memorize, as well as the teaching methods carried out by educators still using the old learning model so the students in the class become boring and tense. To overcome these problems, we need a learning model that is appropriate and relevant to the conditions of the students. This study aims to: (1) obtain information on differences in learning outcomes between students who use the ARIAS learning model and students taught by using a direct learning model in making cakes, gateux and torten at 3 Vocational Highschool, Bogor. This research is an experimental research with a quantitative approach, in which the research sample is divided into two classes, namely: (1) class XII Patiseri 1 which is taught using the ARIAS learning model; and (2) class XII Patiseri 2 which is taught using the direct learning model. The study found: (1) The average score of cognitive learning outcomes, students using the ARIAS learning model were 80, significantly higher than using the direct learning model was 75, in making cake, gateux and torten at 3 Vocational Highschool, Bogor. Researchers suggest: (1) the ARIAS learning model can be used as an alternative in creating an interesting learning in explaining material.

Keywords
ARIAS Learning Model, Direct Learning Model, Learning Outcomes, Cake, Gateaux and Torten,

Topic
Information Engineering

Link: https://ifory.id/abstract/NQU38mjcqrXV

Corresponding Author
Diana Vivanti Sigit

Institutions
Biology Education Program, Faculty of Mathematics and Natural Science, Universitas Negeri Jakarta, Indonesia

*Corresponding author: dianav[at]unj.ac.id

Abstract
Environmental Literacy was the ability to interpret and take appropriate action on environmental systems that purpose to maintain, restore and improve the environment. This study aimed to determine the environmental literacy level of biology undergraduate students. The method was used a descriptive method. The three aspects of environmental literacy were cognitive, affective, and action. Data were obtained from 197 undergraduate students on biology science and biology education departments taken from 5 universities in DKI Jakarta. The result showed that the level of environmental literacy was in a very good category in which the cognitive aspects were the highest. Biology undergraduate students were good in the environment understanding but were still poor in the affective and action aspects. Based on the departments, the environmental literacy of students from biology science was higher than students from biology education. Based on gender, the female was higher in environmental literacy than male. In conclusion, the Biology undergraduate students environmental literacy varies from some aspects. This research recommended that institution has an important role to enhance the student environmental literacy, therefore, a student might increase the affective and the action of environmental literacy.

Keywords
Biology undergraduate student, education, environmental literacy, environmental quality

Topic
Biology

Link: https://ifory.id/abstract/eV6cHkFXUjan

Corresponding Author
Alwin Melkie Sambul

Institutions
Universitas Sam Ratulangi

Abstract
One of the challenges for the people who live in the rural islands of the developing countries is the lack of access to education. Although ICT (Information and Communication Technology) is increasingly regarded as an essential tool to support learning activities in rural areas, the availability of telecommunication infrastructure in such areas is still problematic, primarily because of high implementation cost and low revenue. This study aimed to develop an e-Learning model for the community in the rural islands which utilize ship to deliver to and receive data from the island using store-and-forward communication technique over a transient long-range wireless link established when the ship is at a certain distance from the island. Here we focused on the design of a synchronization method between databases of multiple learning management systems (LMS) between the ship and the island. The design has been implemented and tested using Moodle installed on low-power Raspberry Pi computers. The result showed that our design is suitable to be used in such requirements, hence making it a feasible solution to support ICT-based learning for the people in rural islands.

Keywords
Database synchronization; learning management system; store-and-forward; e-Learning; rural islands

Topic
Computer Science

Link: https://ifory.id/abstract/qGAgaceQhz4R

Corresponding Author
lailatus siami

Institutions
Environmental Engineering Departement, Faculty of Landscape Architecture and Environmental Technology, Universitas Trisakti, Jakarta, Indonesia

Abstract
Water is an important component on earth which community need, especially for clean water consumption. Water treatment plant is one of the solutions as fulfillment of clean water needs that guaranteed quality, quantity and continuity. The aim of this research to determine the effectiveness of coagulants type in water treatment plant planning by using Blorong River as raw water in Semarang City, according to the requirements of water quality of drinking of health minister of Republic Indonesia 492/2010 law. The research using jartest methods by observing the influence of coagulants type consisting of poly aluminium chloride (PAC), alumunium sulfat and chemical mixing alum towards turbidity, pH, iron, zinc, copper, total suspended solid (TSS), and total dissolved solid (TDS) as a parameter observed in two different seasons. The influence of each coagulant also varied with several velocity gradients. It is expected can be specified coagulant type with the ability to decrease those parameters in accordance with drinking water quality requirements which has the most affordable price.

Keywords
Jartest, Poly Aluminium Chloride (PAC), Alumunium Sulfat, Chemical Mixing Alum, Velocity Gradient

Topic
Environmental Engineering

Link: https://ifory.id/abstract/WbngxEuKUV6w

Corresponding Author
Asmiyenti Djaliasrin Djalil

Institutions
Faculty of Pharmacy, Universitas Muhammadiyah Purwokerto
Jl. Raya Dukuhwaluh, PO. Box 202 Purwokerto 53182, Indonesia *asmiyentidjaliasrindjalil[at]ump.ac.id

Abstract
Exposure the ultraviolet (UV) radiation results in a photo-oxidative reaction that reduces the antioxidant defense system and increases the formation of reactive oxygen species (ROS) on the skin. Antioxidant creams protect the skin from adverse effects of UV which cause the initial signs of aging. Several creams containing 0.02 (F1); 0.2 (F2); and 2% of virgin olive oil (VOO) or virgin coconut oil (VCO) were prepared. Antioxidant activities of VOO, VCO, and their creams were evaluated by DPPH radical scavenging assay. The results showed that the oils and formulations have antioxidant activities. The IC50 value of VOO, F1, F2, and F3 of VOO were 31.7±0.1; 176.3±5.9; 111.9±4.7; 90.4±5.5 µg/mL, respectively. Furthermore, The IC50 value of VCO, F1, F2, and F3 of VCO were 44.7±2.0; 62.56±1.8; 53.56±1.7; 47.14±1.7 µg/mL, respectively. The formulation of antioxidant cream containing VOO meets the requirement of stability and physical properties. Meanwhile, the formulation of antioxidant cream containing VCO meets the requirement of stability and some physical properties, except for pH value.

Keywords
Antioxidant cream; Virgin olive oil; Virgin coconut oil

Topic
Chemistry

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

Corresponding Author
Agus pratomo andi Widodo

Institutions
a) Department of Special Education, Indonesia University of Education
*andi.pkh.student[at]upi.edu
b) Department of Chemistry, Indonesia University of Education
c) Department of Special Education, Indonesia University of Education
d) Department of Special Education, Indonesia University of Education

Abstract
The aims of this study to find out how to teach the magnetic field materials to students with deaf and hard of hearing (DHH). The study used a single subject research approach with A-B design (baseline and intervention) in inclusive school in Banjarmasin. The subject of this study consisted of three students with DHH. The results of the study revealed that the magnetic field materials can be mastered by students with DHH. This success is due to the division of tasks or collaboration between special teachers and regular teachers. When the regular teacher explains with media, special teacher plays a role in translating to Sign Language. Not all instructions are translated but only instructions that difficult to understand because basically students with DHH can understand from writing and read the regular teachers-s lips movement. Another factor that shapes understanding of students with DHH are the students seating position. In appropriate position, students with DHH can see regular teacher-s face clearly and help them to read regular teachers-s lips movement. Essentially, students with DHH use their visual abilities to learn.

Keywords
students with deaf and hard of hearing (DHH), the magnetic field materials, collaboration, regular teachers, special teachers

Topic
Physics

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

Corresponding Author
Rusmono Rus

Institutions
UNIVERSITAS NEGERI JAKARTA

Abstract
Education and technology must run together in this millenial century. This study aims to develop teaching materials based on mobile learning for thematic learning in elementary school. This study uses research and development methods by Dick and Carey model. The instruments used in this study were interviews, questionnaires, and tests. The result of this study are teaching materials based on mobile learning. Based on the results of the pre-test and post-test analysis, it showed that there were differences in learning outcomes between the pre-test and post-test stages. The results of the t-test show that t count = 12.10 and t table = 1.99 at the significance level α = 0.05 / 95%. Thus it can be concluded that there is an increase in learning outcomes experienced by students, after participating in thematic learning with teaching materials based on mobile learning.

Keywords
teaching materials, mobile learning, alam sekitar.

Topic
Biology

Link: https://ifory.id/abstract/xW9hQLJGjNdK

Corresponding Author
Rusmono Rus

Institutions
UNIVERSITAS NEGERI JAKARTA

Abstract
Technological advances have a big influence in the world of education. This study aims to determine the effect of mobile learning-based teaching materials on student learning outcomes in natural material. The experimental research method with a sample of 40 people in second grade elementary school students. The results obtained indicate an increase in student learning outcomes in the surrounding natural material after using teaching materials based on mobile learning. The conclusion of the study, there is a positive influence on the use of mobile learning-based teaching materials on the learning outcomes of the environment.

Keywords
teaching materials, mobile learning, alam sekitar.

Topic
Biology

Link: https://ifory.id/abstract/kB8T4pfqRdDV

Corresponding Author
Metha Islameka

Institutions
Institut Teknologi Bandung

Abstract
Regenerative braking is a way to harvest electric energy from braking mechanism which usually implemented in electric vehicles. Braking strategies are required to maximize the use of regenerative braking systems. This research aims to design a regenerative braking model for a medium-sized electric bus. Measurements of latitude, longitude, elevation, and speed were firstly conducted by using GPS-based Osmand Android application. Transjakarta Corridor 1 (Kota-Blok M) was used for a test track with a distance of 14 km. Besides using GPS data, WLTP (Worldwide Harmonised Light Vehicle Test Procedure) data is also used for comparison. This study produced a braking strategy model that considers aerodynamic, rolling, and grade resistances as well as electrical component specifications of the electric bus. The model design is then compared to the existing serial, parallel and eco-models. With the design of this system, the regenerative braking model can harvest more energy which increases the mileage of the electric bus.

Keywords
Regenerative Braking, Energy Efficiency, Eco Model, Electric Bus

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/P6Y9uFQGRUq7

Corresponding Author
Muhammad Rifqi Hidayat

Institutions
a) UIN Antasari Banjarmasin
* rifqifebi[at]uin-antasari.ac.id
b) Universitas Islam Kalimantan Muhammad Arsyad al-Banjari Banjarmasin

Abstract
Dewan Syariah Nasional - Majelis Ulama Indonesia (The National Sharia Council of the Indonesian Ulema Council) has set regulations regarding the provisions that must be fulfilled by Islamic hotels in Fatwa Number 108 of 2016 about Islamic Tourism, but the fatwa has not regulated the phenomenon of Islamic dwelling in the form of houses or boarding houses that have started to appear in Indonesia. So this research is run with the aim to analyze how the community understands, especially the developers and occupants of Islamic houses regarding the definition of Islamic dwelling itself, along with the criteria that distinguish it from ordinary residential or conventional occupancy. This is a qualitative field research type with data sourced from Islamic dwellings in the city of Banjarmasin, to be analyzed inductively. Inductive analysis results from research data indicate that Islamic dwellings is a house and/or rental house and/or boarding house that is run based on Islamic principles and values. There are at least four criteria that need to be obeyed by an Islamic dwelling: Islamic contract; separation of men and women without any blood or marital relations, Islamic environment, and not to use the services of conventional financial institutions.

Keywords
Islamic Board Dwellings; Islamic Dwellings; Islamic Housing

Topic
Business Model Innovation

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

Corresponding Author
Budy Frasetya

Institutions
a) Agrotechnology Department, UIN Sunan Gunung Djati Bandung Jalan A. H. Nasution No. 105 Bandung 40614, West Java, Indonesia
*budyftq1682[at]gmail.com

Abstract
The application of salt fertilizer to increase the productivity of lettuce in long term application will decline soil fertility. Implementation of totally organic farming in some region cannot increase productivity rapidly. Combine application of vermicompost with salt fertilizer is a solution to answer decline lettuce production on the first time implementation of totally organic farming. This research aims to study the dose application of vermicompost on the growth of lettuce plant. The research conducted at Cisurupan-Garut West Java Province with altitude 1183 m above sea level from January to March 2018. The method used in this research is randomize block design with seven treatments (A= without vermicompost, B= 5, C= 10, D= 15, E= 20, F=25, G= 30 t ha-1), and four replication. The growth parameter observes in this research is plant height, number of leaves, fresh plant weight, plant dry weight, and shoot-root ratio. The data were collected from the observed parameter than analyzed with variance analyze at five percent signification level. The result of this research shows that the application of 5 t ha-1 vermicompost improves plant growth significantly.

Keywords
Vermicompost, totally organic farming, soil fertility

Topic
Biology

Link: https://ifory.id/abstract/WNq8eUDr7Cb2

Corresponding Author
MUHAMMAD NAFI ANNURY

Institutions
UNNES Semarang

Abstract
The following study aims to find out which is the highest use of metacognitive reading strategies among the academic learners majoring in EFL students, Faculty of Education and Teacher Training UIN Walisongo Semarang. There is only one class which administered to be the participant of this study. It consists of forty-one students; ten male students and there are thirty-one female students. First of all, metacognition discusses the process of an individual in planning and managing oneself in order to achieve his or her goal. In other words, metacognitive strategies are steps that learners take for improving their language performances. A quantitative analysis is employed. Based on the MARSI (Metacognitive Awareness of Reading Strategies Inventory) questionnaire, which consists of thirty-three items that should be responded by EFL in reading comprehension class. Categories of learners employed a Likert scale of reading metacognitive strategies. They are global reading strategies (M= 3.73), problem-solving strategies (M= 4.10), and support reading strategies (M= 3.38). The result showed that academic learners mostly apply the problem-solving strategies, followed by global reading strategies, and support reading strategies.

Keywords
Metacognitive, Strategies, EFL Learners, Reading Classes

Topic
Education

Link: https://ifory.id/abstract/FLUYKAwB2jmQ

Corresponding Author
Asep Maosul

Institutions
Universitas Pendidikan Indonesia

Abstract
Analysis of the use of SPOT in the process of learning in the Universitas Pendidikan Indonesia is very important, so that it can be known to what extent the use of SPOT can be used as self-directed learning for Students at the Universitas Pendidikan Indonesia, especially in Culinary of Educaion Education Study Program. In this study, data was collected from 61 student respondents in the Culinary of Education Study Program 2016 at the Universitas Pendidikan Indonesia using SPOT . The variables studied were the documentation process on SPOT, SPOT operation, and SPOT accessibility. The research instrument used in this study was a questionnaire. The results of data analysis can be explained that the use of SPOT as an application in the learning process is said to be very feasible seen from the results of processing observational data as much as 91.3%. The results of the observation data processing as much as 88.3% have been very feasible to operate the SPOT application used in the learning process. The feasibility of the results of the accessibility test on the use of SPOT by analyzing the results of observations on students 80% is very feasible for the accessibility of the SPOT application used in the learning process.

Keywords
Self-directed learning; online learning system; SPOT UPI

Topic
Computer and Communication Engineering

Link: https://ifory.id/abstract/yA9ZVBXRDmhq

Corresponding Author
Herni Yuniarti Suhendi

Institutions
Pendidikan Fisika UIN Sunan Gunung Djati Bandung

*herni.suhendi[at]uinsgd.ac.id

Abstract
This study aims to analyze the feasibility of learning media Passing (String Series Parallel) for material elasticity and hooke law. The method used in this study is ADDIE developed by Robert Marie Branch. The stages are Analysis (Analysis), Design (Design), Development (Development), Implementation (Implementation), and Evaluation (Evaluation). The steps of this study are: 1) Curriculum analysis, analysis of the results of interviews and questionnaires of students, and analysis of literature studies, 2) Designing learning media Passing, 3) Realizing Passing practicum tools 4) Conducting expert validation tests 5) Product revisions. The results of the study obtained a tool validation value of 90.47% with a feasible category. This study concluded that Passing is feasible to be used as a learning media in the material of elasticity and hooke law.

Keywords
practicum tool, hooke-s law, learning media, ADDIE

Topic
Physics

Link: https://ifory.id/abstract/pW6ceg2GFLPE

Corresponding Author
Ni Wayan Widhidewi

Institutions
Faculty of Medicine and Health Sciences, Universitas Warmadewa, Denpasar, Bali

Abstract
Almost 2 million Muslims from more than 183 countries conduct Hajj to Mecca, Saudi Arabia every year. This event carries significant public health challenges not only infectious disease transmission but also exacerbation of non-communicable diseases. Although the prevalence of cardiovascular disease (CVD) was not high, it confers high mortality rate. The aim of this study is to identify major risk factors of cardiovascular event among Hajj pilgrims from Bali in 2018. A cross sectional study was conducted in Western Denpasar Community Health Center, where the Hajj preparations take place. Demographical data, history of preexisting medical illness, physical examination, laboratory, electrocardiogram (ECG), thorax x-ray results were collected. CVD risk defined as the finding of at least one of the parameters (age ≥ 55 years old, hypertension, diabetes mellitus, dyslipidemia, hyperuricemia, ECG or x-ray abnormalities). A total of 99 participants were enrolled in the study. Among them, 97 (98%) participants had at least one CVD risk factor. Significant findings of Hajj Pilgrimage with CVD risk implicate that the CVD risk factors identification are profoundly recommended to avoid mortality and morbidity related to cardiovascular event during Hajj-period.

Keywords
Hajj pilgrim; risk; cardiovascular disease

Topic
Biology

Link: https://ifory.id/abstract/7hCW34QzxJnY

Corresponding Author
Yuli Rahmawati

Institutions
a. Universitas Negeri Jakarta
Jl Rawamangun Muka, Jakarta Timur
*yrahmawati[at]unj.ac.id

b. Universitas Halu Oleo
Jalan Kampus Bumi Tridharma, Andunohu, Kambu, Kendari, Sulawesi Tenggara

Abstract
The paper portrays the integration of Science, Technology, Art, Engineering, and Mathematics (STEAM) project in chemistry learning of electrolyte non-electrolyte solutions for developing 21st-century skills. The participant of the thirty-two of year-10 students has engaged in the study. The research employed qualitative research with multiple data collection of semi-structured interviews, classroom observations, reflective journals, and documentation were guided by the 21st-century skills rubric. In addition to the project has been assessed with the criteria of project development, STEAM integration, and product quality. Students designed an innovation project with the integration of STEAM in developing the building miniature by using the nature electrolyte solution sources, such as lemon, lime, apples, and salt water. Students created posters and video projects and presented in the project exhibition. Students are able to integrate their knowledge from various fields to solve problems and create new innovations. The students have developed the 21st-century skills of collaboration, communication, critical thinking, creativity and innovation besides using the technology as a tool for learning. The engaging learning environment has encouraged students to develop their skills and chemistry conceptual understanding.

Keywords
chemistry learning, STEAM, 21st-century skills, electrolyte non-electrolyte solutions

Topic
Chemistry

Link: https://ifory.id/abstract/rEgT7LYpwKuB

Corresponding Author
Suryo Prakoso

Institutions
a) Petroleum Engineering, Faculty of Earth and Energy Technology, Universitas Trisakti

b) Geological Engineering, Faculty of Earth and Energy Technology, Universitas Trisakti

Abstract
It has been believed that the P-wave velocity is strongly influenced by complexity of pore arrangement. In Sandstones, pore complexity is influenced by the constituent material of rock including clay volume. Rocks with a certain clay volume will have a certain pore geometry and pore structure and also they have certain qualities. This research is intended to study the effect of clay volume on rock quality and its effect on the relationship of porosity with P-wave velocity. This research used 3 sandstone data sets from the North West Java basin, Kutai basin and Southern Sumatra basin. The mineralogy of each rock sample is dominated by quartz and kaolinite. The three data sets show the relationship of porosity and P-wave velocity can be clearly separated by clay volume. Each of these rock groups indicates rocks of different qualities called rock types. It can be concluded that the variation of P-wave velocity is influenced by rock type. The lower rock quality is denoted by the larger rock type number and is indicated by the increase in clay volume.

Keywords
P-wave Velocity, pore arrangement, clay volume, rock type

Topic
Physics

Link: https://ifory.id/abstract/qBwz6hN9JFfg

Corresponding Author
Arionmaro Asi Simaremare

Institutions
a) PLN Research Institute, Jalan Duren Tiga No 102, Jakarta 12760, Indonesia

Abstract
Transmission lines plays important roles in delivering electric energy from generation site closer to the customer. Failure of a transmission line can cause significant economic loss due undelivered energy and may lead to catastrophic system black out. One critical part of transmission line is dead end connector, thus ensuring good condition of transmission line dead end connector is critical to avoid extensive losses. This paper investigates the cause of failure of dead end connectors that were installed in 150 kV ACSR lines. The failed connectors were examined and tested to find out the cause of the breakdown. Several samples of suspected bad connectors are also tested for comparison. Simulations using finite element software were conducted to provide broader insight on failure propagation. The investigation found that the dead end connectors were failed due to high current flowing through the steel part of the conductor which is caused by high contact resistance between the aluminum part of the conductor and the connector. Further study is needed to mitigate similar condition to occur in the dead end connector installation

Keywords
dead-end connector; contact resistance; finite element

Topic
Electrical Engineering

Link: https://ifory.id/abstract/TdQYX8ZF9RrE

Corresponding Author
Yuli Rahmawati

Institutions
a Universitas Negeri Jakarta
Jl Rawamangun Muka, Jakarta Timur, Indonesia
*yrahmawati[at]unj.ac.id
b. Universitas Halu Oleo
Jalan Kampus Bumi Tridharma, Andunohu, Kambu, Kendari, Sulawesi Tenggara

Abstract
This study aimed to develop critical thinking skills through Culturally Responsive Teaching (CRT) approach and ethnochemistry of Tegal culture. The teaching approach is focusing on exploring the culture and local wisdom in Tegal Culture especially in Acid-Base such as Jamasan Tradition, Nginang, and Moci from chemistry perspectives integrated into CRT. The study employed the teaching model which consists of five phases of self-identification, cultural understanding, collaboration, critical reflections, and transformative construction. The study involved 35 students of year 11 in secondary school in Balapulang Tegal. The qualitative methodology approach has been employed with observation, interviews, critical thinking test, and reflective journals as data collection. The results showed that the integration of ethnochemistry in CRT approach has engaged students in developing their critical thinking skills in developing a conclusion, making the connection, conceptual understanding, and interpretation with the critical thinking skills test shows 40% students have reached level 3 (Satisfactory). In addition to the students engaged in the cultural identity empowerment, meaningful chemistry learning experiences, and team working. The students have been challenged in developing their critical thinking skills.

Keywords
chemistry learning, culturally responsive teaching, ethnochemistry, critical thinking skills, acid-base

Topic
Chemistry

Link: https://ifory.id/abstract/txk7pgUn9aCZ

Corresponding Author
INTAN PERMANA

Institutions
Universitas Garut

Abstract
Brand advocacy ratio is one of the marketing productivity measures that can be applied in various industries. In the present study, the authors examined the role of ecommerce in raising customers brand awareness, encouraging purchase, and promoting the brand of Apple in Asia. This study was conducted through a survey on 30 respondents. It was revealed that Google-s search engine managed to raise the Apple brand awareness to the highest level, namely top-of-mind awareness. In addition, the availability of Apple-s products in marketplaces such as Amazon, Shopee, and Lazada was proven to promote sales in Asia. One of its websites www.support.apple.com was proven to increase its brand advocacy ratio because of its comprehensive product information, help service, and information on the nearest Apple-s stores. In today-s digital era, marketing productivity in the form of brand advocacy ration could be improved by search engines (e.g., Google), marketplace (e.g., Amazon, Shopee, and Lazada), and corporate websites.

Keywords
e-Commerce; Marketplace; Website; Brand awareness; Purchasing; Brand advocacy ratio

Topic
Management Science

Link: https://ifory.id/abstract/h2LzNqtdfAYk

Corresponding Author
Kurniasih Kurniasih

Institutions
Gadjah Mada University

Abstract
Tilapia aquaculture is well developed in Indonesia, however, the main problem which may cause loss is bacterial infection, mainly Aeromonas salmonicida which may result in furunculosis. Identification of furunculosis takes a long time and it is often confused by A. hydrophila infection. The aim of study was to produce primary antibody from local isolate of A. salmonicida, for detecting furunculosis based on immunohistochemistry staining. Local isolate of A. salmonicida was attenuated using formaldehyde to obtain the O antigen and further intraperitoneally injected to the rabbits with weekly increased dosage which were 0.5, 1, 2, and 3 mL. The immunization was done in 4 weeks, and at the 5th week the blood sample was collected to make the primary antibody for immunohistochemistry procedure. The result showed that the antigen of A. salmonicida was found in the liver, kidney, spleen, gill, and intestine since the third until tenth day post infection. The reaction of antigen and antibody appeared as brown colour within the cytoplasm of those organs. The conclusion is the primary antibody of A. salmonicida is very sensitive for immunohistochemistry.

Keywords
Aeromonas salmonicida; immunohistochemistry; tilapia; primary antibody

Topic
Agricultural structures and environmental engineering

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

Corresponding Author
Anny Eka Pratiwi

Institutions
Faculty of Medical and Health Science, Warmadewa University, Denpasar, Bali (1)
Faculty of Sains, Health, ant Technology, Dhyana Pura University, Badung, Bali

Abstract
A research on the analysis of water quality and hotel liquid waste in Ubud regency, Gianyar-Bali has been conducted. The analysis of raw water quality was done to discover whether the raw water can be appropriately classified as clean water. The parameters used in analyzing the raw water are its bacteriological and hardness level. Analysis on the quality of liquid waste was done discover whether the hotel liquid waste can still be categorized align with the government standard in the disposal to the surrounding environment. Based on the result of hotel raw water analysis, five samples have aligned with the clean water standard, which is possible to categorized as clean water; while for the analysis of hotel liquid waste, the parameters used are turbidity, pH, BOD, COD and bacteriological test. The analysis shows that four hotels have exceeded the reasonable level of waste, where scheduled surveillance is required in keeping the environment away from waste disposal.

Keywords
raw water, hotel waste, pH, turbidity, hardness, BOD. COD, bacteriological.

Topic
Chemistry

Link: https://ifory.id/abstract/YayAr7UXCkN4

Corresponding Author
Khaerul Manaf

Institutions
1)Department of Informatics, Faculty of Science and Technology State Islamic University Sunan Gunung Djati Bandung, Indonesia.
*khaerulmanaf[at]uinsgd.ac.id

Abstract
Game education is a game in which there are elements that can be honed and education can increase knowledge, whereas that is a game of puzzle construction through post or to match an object sehinggan into certain patterns. Fisher yates shuffle algorithm is a randomization technique where the algorithm is implemented on a puzzle piece, so the puzzle pieces out will be different and menghasikkan without repetition and duplication. In this study it can be concluded that the fisher yates shuffle algorithm capable of determining a solution that does not double randomization and not repetitive. Based on testing pretest and posttest educational puzzle game is able to enhance students knowledge of early childhood education as much as 23.68% which results pretest posttest 64.13% and 87.81% results

Keywords
educational games, puzzles, fisher yates, android apps

Topic
Computer and Communication Engineering

Link: https://ifory.id/abstract/D3XnjhRAbP2w

Corresponding Author
Vivi Alvionita Sari

Institutions
1,2) Department of Chemical Engineering, Institut Teknologi Sepuluh Nopember Surabaya

Abstract
Molasses, Stillage or vinasse and Spent wash (bottom product of distillation column) are large liquid wastes production in the bioethanol industry that contain high sulfur. The liquid wastes with high sulfur contain are dangerous if it discharges directly into the environment without pretreatment. For this reason, pretreatment is needed to reduced the sulfur concentration of liquid waste (molasses) using biofiltration method. The objective of this research is to eliminate the content of H2S or sulfur in the wastewater of the bioethanol industry (molasses) by using aerobic bacteria such as Acidithiobacillus thiooxidans dan Pseudomonas putida. The method of this experimental work used biofiltration which are attached on wood chips or bagasse packing by aerobic bacterial to form biofilms in the reactor. The process in this study was conducted in two steps. The first step was carried out by sulfur oxidizing bacteria such as Acidithiobacillus thiooxidans and Pseudomonas putida with a concentration of 10% and 20% (v/v) that growth on packing to form biofilms in the reactor for 13 days. Furthermore, as the second step the bacteria degraded H2S content of liquid waste with attached bacteria on packing for 15 days in biofiltration reactor. From the preliminary results of this study, reactor with 10% (v/v) A. thiooxidans on wood chips packing and 3% (v/v) concentration molasses waste can degraded H2S from 4.35 mg/L to 1.55 mg/L (64.37% removal efficiency) and for reactor with 20% (v/v) A. thiooxidans can degraded H2S from 4.35 mg/L to 1.16 mg/L (73.33% removal efficiency). Meanwhile, reactor with 10% (v/v) Pseudomonas putida can degraded H2S from 4.35 mg/L to 1.94 mg/L (55.40% removal efficiency) and for reactor with 20% (v/v) Pseudomonas putida can degraded H2S from 4.35 mg/L to 1.47 mg/L (66.21% removal efficiency).

Keywords
Acidithiobacillus thiooxidans, Biofiltration, Molasses, Pseudomonas putida, Wood chips

Topic
Chemical Engineering

Link: https://ifory.id/abstract/bT3NeEwaJ6HC

Corresponding Author
Hartati Hartati

Institutions
Physical Education and Health of Teacher Training and Education Science Faculty,
Universitas Sriwijaya, Palembang, Indonesia
Email: hartati[at]fkip.unsri.ac.id, silviaryanti[at]fkip.unsri.ac.id, giartama[at]fkip.unsri.ac.id

Abstract
This study aims to determine the increase in basketball dribble learning outcomes of physical education and health students in the Faculty of Teacher Training and Education. Multimedia used is based on macro flash. This research is a classroom action research aimed at determining the effectiveness of basketball dribble learning. The subjects in this study were physical and health education students. Classroom action research was conducted using 2 cycles. The results of the study in cycle 1 showed that there was an increase in student learning outcomes in the first test. There were 4 students (10%) in the good category, 14 students (35%) were in the adequate category, and the lower category was initially 22 students (55%). The results in cycle 2 are that there is a significant increase from 4 students (10%) in the good category to 36 students (90%), and 4 students (10%) in the sufficient category. The findings in this study are multimedia macro flash-based learning can improve student learning outcomes in basketball dribble learning. The implication of this study is that multimedia macro flash-based learning can be used as a medium of learning choice to improve basketball dribble learning.

Keywords
multimedia, basketball dribble, classroom action research

Topic
Sport Science and Technology

Link: https://ifory.id/abstract/ERubnqr74A3e

Corresponding Author
Yuli Rahmawati

Institutions
(a)Jl Rawamangun Muka, Jakarta Timur
Universitas Negeri Jakarta
*yrahmawati[at]unj.ac.id

(b) SMA Bakti Mulya 400
Jl. Lingkar Selatan, Pondok Pinang,
Jakarta Selatan 12310

(c)Arief Setiawan
SMP Pembangunan
Jl. Pengayoman III No. 95, Utan Kayu Utara
Jakarta Timur

Abstract
The paper portrays the study of the integration of ethnopedology in wastewater treatment project to engage science students in learning environmental pollution. The study involved two classes in junior high school in Jakarta. The cultural practices in dealing with environmental pollution from five regions of Jakarta, Bandung, East Java, Central Java, and Banten have been integrated into the study. The qualitative research with multiple data collection of reflective journal, interviews, and science concept test. The project of wastewater treatment has been developed through the information of indigenous knowledge which has been explored. The results show that the ethnopedagogy integration in science learning has engaged students in understanding their cultural identity and developing their problem solving, critical and creative thinking skills. The science of conceptual understanding has been developed throughout the learning experiences. In addition to students have developed their skills in communication and collaboration with completing the project. The students faced the challenges of shifting their identity from passive to active learners within meaningful and enjoyable learning experiences.

Keywords
ethnopedagogy, science learning, environment pollution, wastewater treatment project, students engagement

Topic
Chemistry

Link: https://ifory.id/abstract/fEq2NuKFgzXU

Corresponding Author
Astri Rinanti

Institutions
Universitas Trisakti

Abstract
Bioremediation is an effective alternative for removing heavy Cu2+ metals because it is environmentally friendly, a cost-effective technology and permanently detoxifies pollutants. This research was conducted to remove heavy Cu2 + metals using the bioremediation method by utilizing a mixed culture of Thiobacillus sp. and Clostridium sp. as bioremedian. This research was conducted on liquid media which was started in artificial growth media is Stone Mineral Salt solution (SMSs) with the parameters tested in the form of temperature (oC) and Cu2+ heavy metal pollutant concentration. The variabels used consisted of temperature (oC) is 20, 25, 30 and 35, pollutant concentration (ppm) is 25, 50, 75 and 100. Analysis by Atomic Absorption Spectrophotometry (AAS) was carried out to determine the heavy metal content of Cu2+. In addition, the calculation of Cu2 + heavy metal removal efficiency was carried out. In this research, the exponential phase of the growth of mixed culture of bacteria was at a temperature of 30 oC, pH of 7 with a pollutant concentration of 100 ppm. So that, the percent allowance for heavy metals Cu2 + in liquid media until 90%. The efficiency of the use of mixed cultures of the bacteria Thiobacillus sp. and Clostridium sp. as bioremedian in reducing the heavy metal content of Cu2+ in liquid media it can reach the range until 90% with the variation used is a temperature of 30 oC, pH of 7, the pollutant concentration of 100 ppm with the contact time used is 48 hours.

Keywords
Bioremediation, Heavy metal Cu2+, Thiobacillus sp., Clostridium sp., Removal, Growth Media

Topic
Environmental Engineering

Link: https://ifory.id/abstract/jBt4vHzcTuk3