Indonesia Conference Directory

Corresponding Author
Masyurah Muzaimah

Institutions
a) Magister of Mathematics Education, University of Lampung. Jl. Prof Brojonegoro No. 1, Bandar Lampung 35141, Indonesia
*masyurahmuzaimah[at]yahoo.co.id
b) Department of Mathematics and Sciences Education, niversity of Lampung. Jl. Prof Brojonegoro No. 1, Bandar Lampung 35141, Indonesia

Abstract
Abstract. This descriptive research aims to figure out students reflective thinking ability at the quadrilateral material. The subjects of this research were SMP students involving 32 seventh grade students at SMP Muhammadiyah 3 Bandar Lampung. The Data was taken through reflective thinking ability test which consists of 4 math story problem that involved 3 indicators of reflective thinking, namely reacting, comparing, and contemplating. In order to obtain a comprehensive description related to the ability of reflective thinking students, the data was qualitatively and quantitatively analysed. The result of the research shows that students reflective thinking ability are still not optimal. It can be seen from the majority of students who still get difficulties in building a deep self-understand of problem, inability to deliver what has been understood in a certain reason, as well as inability in concluding a proper answer.

Keywords
Reflective Thinking; Reflective Thinkingg ability; Mathematical Stories

Topic
Mathematics Education

Link: https://ifory.id/abstract/JTGPERacz2Hh

Corresponding Author
Anggita Hafsari

Institutions
Departement Biology, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung. Jl. AH. Nasution No 105 Bandung, 40614

Abstract
The purpose of this research was to obtain information about the best quality of bioplastic fruit packed using kombucha cellulose which grow in green tea media (Camellia sinensis L.). This research was carried out with a trial method of Completely Randomized Design (CRD) 5 arrangements with 4 replications and a total sample of 20. By administering 1%, 2%, 3%, 4% and 5% glycerol. The statistical analysis used is Analysis of One-way Variance (ANOVA). The characteristics of Bioplastic packaging from kombucha cellulose with the approval of glycerol concentrations of 1%-5% (v / v) produced a combined average mean value of 0.015 mm, 0.02 mm , 0.025 mm, 0.027 mm and 0.045 mm. The tensile strength values obtained were 7.22 N / mm2, 3.27 N / mm2, 2.17 N / mm2, 1.80 N / mm2 and 2.15 N / mm2. The highest percent value was 73%,. While the highest solubility values were 50%. Application of kombucha cellulose as a bioplastic packaging in tomato fruit is acceptable as an alternative packaging fruit biodegradable material for fruit.

Keywords
Bioplastic Packaging Fruit, Kombucha Celullose, Camellia sinensis L.Biodegradable

Topic
Biology

Link: https://ifory.id/abstract/E3zhRXuwUGV8

Corresponding Author
Dini Asri Kusnia Dewi

Institutions
Indonesia University of Education

Abstract
Many people assume that addition and subtraction are simple calculations. However, some studies in Indonesia reveal that students still experience some problems associated with it, such as the carrying method in addition and borrowing method in subtraction. In terms of learning, when referring to Brunners theory, the presentation of the textbook does not provide an explanation of how to calculate using the iconic representation. Of all these things, it is important to be able to know the way students think that this depends on the mental model. However, because the mental model is an internal representation then the effort that can be done is analysis them through representation. Therefore, this study was conducted through tests and interview for students, also interviews for teachers. The field survey results show a tendency in selecting the type of representation. In addition, this paper will also be presented a representation of the mental model of a student.

Keywords
Mental Models, Representation, Addition, Subtraction

Topic
Mathematics Education

Link: https://ifory.id/abstract/FBT7UzgnLJrc

Corresponding Author
Arrival Rince Putri

Institutions
a,b) Department of Mathematics, Andalas University, Kampus Unand Limau Manis, Padang, 25163, Indonesia
*arrivalputri[at]gmail.com

Abstract
Mathematical modeling is a tool used for the mechanism of strategy in controlling epidemics. In this paper, a basic model for bird flu epidemic is developed. Vaccination treatment of bird flu is a common method used to control disease. The bird flu model is reformulated by taking into account vaccination. Those models are system of ordinary differential equations. Stability of both the models are discussed and associated with the threshold number stating population is free of disease or infected. Numerical solutions are given on phase plane to confirm the analytical results.

Keywords
Epidemic model; Vaccination; stability; Threshold number; Numerical solutions

Topic
Mathematics

Link: https://ifory.id/abstract/YFcnMVD3h7pk

Corresponding Author
Ahmad Yani

Institutions
Universitas Negeri Makassar

Abstract
This study is a pre-experiment which aims to describe psychomotor abilities in practicum activities. The study subjects were 27 students at X IPA 2 Grade, SMA Negeri 7 Wajo. This research was conducted in 2018/2019 academic year. The study datas were gathered by non-test observation sheet. The study results showed that the highest experiment psychomotor abilities indicator is using experiment instruments and matterials skill at 86,53 %. The following ability is analyzing and designing experiment at 85,41 %. The lowest ability is interpreting and presenting experiment result at 82,7 %. Those abilities are in very good criteria based on Suhertian-s psychomotor skills category (2010)

Keywords
Practical Activities, Psychomotor Abilities, Observation Sheets

Topic
Physics Education

Link: https://ifory.id/abstract/GpakRHyq2CW6

Corresponding Author
Putri Sekar Melati

Institutions
a)Department of Science Education, Universitas Pendidikan Indonesia, Jl.Dr. Setiabudhi No. 229 Bandung 40154, Indonesia.
*putrisekarmelatiimel[at]upi.edu

Abstract
Food and Agriculture Organization of the United Nations (FAO) stated that one third of global food production became food waste. Therefore, food waste issue become worldwide concern that needs concrete and innovative solution combined with latest technology. These facts are the reasons why FAWless (Food Assist Wasteless) is made. This android based application is made to reduce food waste that is produced by society by helping them by distributing their extra food or almost expired food so that it is not wasted. Besides, FAWless is also made in order to put food waste into use. This research use descriptive method. The samples are grouped into four categories which are student, student dormitory, household, and small and medium enterprise .The result shows that samples are able to install and use FAWless application to distribute their extra food. The extra food is categorized into meal, snack, beverages, fruit and vegetable, expired food, fruit and vegetable waste. The samples can also donate money through FAWless for operational cost. Once the sample used FAWless, the food or donation will be picked up and distributed to people in need.

Keywords
Android based application, FAWless, food waste

Topic
Integrated Science Education

Link: https://ifory.id/abstract/rbRMpHnkvf6w

Corresponding Author
Hartati Hartati

Institutions
Biology of Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Makassar

Abstract
This research that aims for antibacterial activity Lannea coromandelica extract. The klika was extracted by wet and dry method using ethyl acetate and ethanol 70% that acquired 4 types of extract they are ethanol extract 70% of wet klika Kayu Jawa (KJBE70%), extract ethanol 70% of dry klika Kayu Jawa (KJKE70%), ethyl acetate extract of dry klika Kayu Jawa (KJKEA), and extract of wet klika Kayu Jawa (KJBEA). Extracted by maceration, dan then antibacterial acivity. The results from this research shown that all extracts have antibacterial activity to inhibited bacteria test growth (Escherichia coli, Staphylococcus aureus, Pseudomonas sp., and Vibrio parahaemolyticus.

Keywords
Lannea coromandelica, antibacterial activity

Topic
Biology

Link: https://ifory.id/abstract/ApUNhD7gudqt

Corresponding Author
Jajang Kusnendar

Institutions
a) Computer Science Education, Indonesia University Of education
Jl. DR. Setiabudhi No.229,Bandung, Indonesia
b) Faculty of Mathematics and Science Education

Abstract
This research aims to measure the improvement of students understanding skills after treatment or treatment using Visual, Auditory, and Kinesthetic (VAK) based multimedia models on computer subjects and basic networks. This research discusses several things as the following 1) design and development of a multimedia-based VAK Model; 2) influence of Model-based VAK mutimedia on improving students understanding. 3) Multimedia eligibility by implementing VAK learning models in computer and basic network subjects. The method of research used is quantitative with the stage of multimedia development using water-fall method. The research Data is taken from the interview to the teacher to the teaching subjects as the object of this study. From this study obtained results: 1) This stage of multimedia development from the design level, designing, validation of ex-perts, to testing and testing, conducted tests by me-dia experts and material experts using question-naires based Learning Object Review Instrument (LORI. This multimedia feasibility is rated very decent with the assessment of media experts having an average of 85.40% and expert assessment of material has an average of 84.75,%

Keywords
Visual, Auditory, Kinesthetic (VAK), Multimedia Education, VAK, Visual, Auditory, Kinesthetic.

Topic
Computer Science Education

Link: https://ifory.id/abstract/pTNvABr6fQEz

Corresponding Author
Vina Serevina

Institutions
State University of Jakarta

Abstract
This study aimed to determine the application of guided inquiry learning models to improve student learning outcomes at class XI Mathematics and Natural Sciences 2, in 42 Public High School, Jakadrta. The research method used classroom action research. This research was conducted in two cycles, where each cycle consisted of planning, implementation, observation, and reflection. The minimum completeness criteria (KKM) indicators of learning outcomes that must be achieved are 70 with affective, cognitive, and psychomotor domains. The results showed that the average score increased in all three domains. The results of this study indicate that the average score of student learning outcomes in the affective domain of the first cycle is 68.73%, the cognitive domain of the first cycle is 60.33%, and the psychomotor domain of the first cycle is 70.17%. While the average score of affective domain student learning outcomes from the second cycle 72.33%, the cognitive domain of the second cycle 78.23%, and the psychomotor domain of the second cycle 76.61%. Based on these results, it can be concluded that the application of a guided inquiry learning model can improve student learning outcomes.

Keywords
guided inquiry learning model, learning outcomes

Topic
Physics Education

Link: https://ifory.id/abstract/EH3TYBM7cb6N

Corresponding Author
Arrijani Arrijani

Institutions
Biology Study Program, Faculty of Mathematics and Natural Sciences, Manado State University

Abstract
This research is motivated by the learning conditions in Airmadidi State High School where there are weaknesses including: the learning process is still centered on the teacher as the main source of knowledge, where students do not dare to argue and some students do not pay attention to what is conveyed by the teacher. The objective to be achieved in this study is to improve student learning outcomes in photosynthesis material through the Learning Cycle learning model 5E in class XII Science students at Airmadidi State High School in 2019/2020. This research is a classroom action research conducted at Airmadidi State High School with subjects of class XII science students. The object of research is the Learning Cycle 5E on photosynthesis material. The research process was carried out in two cycles which included five stages, namely planning, implementation, observation, reflection, and evaluation. The data analysis technique used is a qualitative descriptive technique that is by analyzing student development data in the first cycle and second cycle is equipped with an average analysis of cognitive values, affective values, and psychomotor values of students. The results obtained showed that the average student learning outcomes in the first cycle, cognitive domain = 71,67 affective behavioral domain (very good); and psychomotor domain (very interested). Average student learning outcomes in cycle II, cognitive domain = 80.15 (successful) or increased from cycle I; affective domain (very good) or increased from the first cycle; psychomotor domain (very interested) or increase from cycle I. Based on the results of the study, it can be concluded that the Learning Cycle 5E learning model can improve the teaching and learning process, this is supported by an increase in Biology learning outcomes for students of class XII IPA SMA Negeri Airmadidi in the academic year 2019/2020.

Keywords
learning outcomes, learning cycle learning model 5e, photosynthesis.

Topic
Biology Education

Link: https://ifory.id/abstract/RV3HzrkAtWG4

Corresponding Author
Nia Gardenia

Institutions
a)Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia
b)Departemen Pendidikan Matematika, Universitas Indraprasta PGRI, Jl. Nangka No. 58C (TB. Simatupang), Tanjung Barat, Jagakarsa, RT.5/RW.5, Jakarta Selatan, DKI Jakarta 12530, Indonesia
c)Departemen Pendidikan Matematika, Universitas Pasundan, Jl. Tamansari No. 6-8, Tamansari, Bandung Wetan, Kota Bandung, Jawa Barat 40116, Indonesia

Abstract
This study aims to obtain an overview of the adaptive reasoning abilities of students who get mathematics learning through the Problem Based Learning approach with Probing-Prompting techniques compared to students who get conventional learning. The subjects in this study were eighth grade students of SMP Negeri 3 Lembang, West Bandung Regency. The problems underlying this research include the adaptive reasoning ability of students in Indonesia is still low so innovation is needed in learning that can develop students adaptive reasoning abilities. This research is a quasi-experimental research. Data obtained through research instruments in the form of tests and non-tests. Data analysis was carried out quantitatively. Quantitative analysis was performed by calculating the N-gaint using the normality test, and the Mann-Whitney U test. The results showed an increase in students adaptive reasoning abilities in both groups, an increase in the adaptive reasoning abilities of students who obtained mathematics learning through the Problem Based Learning approach with Probing- Prompting is better than students who get conventional learning.

Keywords
problem based learning approach, probing-prompting technique, adaptive reasoning ability

Topic
Mathematics Education

Link: https://ifory.id/abstract/LWtvqBb2VTQx

Corresponding Author
Reni Susanti

Institutions
Universitas Muhammadiyah Malang

Abstract
This study aims to describe the application of a scientific approach using guided inquiry and see the level of critical thinking skills of students in Social Statistics courses. This type of research is descriptive with a qualitative approach. Data collection methods in This study uses observations and tests. Data obtained from 60 students. The results showed that the application of the scientific approach using guided inquiry in Social Statistics courses can be carried out following the learning steps that have been prepared with an average student activity of 80%. Student learning activities during learning are categorized as good, with details of activities observing, reasoning, trying and communicating the same category which is good, while the questioning activity is quite good. Students critical thinking skills as a whole are classified as very good, with details that are classified as high in the aspects of identifying the assumptions given, and in good categories on the indicator of revealing data/definitions/ theorems to solve problems and evaluating aspects in solving problems.

Keywords
guided inquiry, scientific approach, critical thinking

Topic
Mathematics Education

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

Corresponding Author
Ria Triayomi

Institutions
Primary School Teacher Education, Universitas Katolik Musi Charitas, Jl. Bangau No.60 Palembang 30113, Indonesia

Abstract
This study aims to analyze the arguments of elementary school students on thematic learning material using the Toulmin Argumentation Model. Toulmins Argumentation Model is a data collection instrument to manage the arguments submitted by students. The arguments presented in the form of answers from students who will be grouped into 5 groups, namely Data, Claims, Warrant, Backing, and Disclaimer. The results of students arguments show that 59.8% are categorized as Data, ie students understand the questions given so they can write any information based on knowledge they know, 74.25% are categorized as Claims, ie students are able to express their opinions in written form based on understanding of the questions given, 53% are categorized as Warrant, ie students are able to explain the relationship between Data and Claims, 48.8% are categorized as Backing, namely students are able to answer all questions asked and finally 93% of students are classified as refutation, that is, students are able to refute the questions given by researchers in making false statements. Based on the data it can be concluded that the level of argumentation of elementary school children is still low.

Keywords
analyze argumentation, Primary School, Toulmin Argumentation Model

Topic
Integrated Science Education

Link: https://ifory.id/abstract/3u8rVBaUvYG9

Corresponding Author
Yosi Gumala

Institutions
1Program Studi Pendidikan Dasar, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229 Bandung 40154, Indonesia
2Departemen Pendidikan Kimia, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229 Bandung 40154, Indonesia
3Departemen Pendidikan Guru Sekolah Dasar, Universitas Bhayangkara Jakarta Raya, Jl. Darmawangsa 1 No 1 Jakarta 12140, Indonesia
4Prodi Pendidikan Guru Madrasah Ibtidaiyah, IAIN Tulungagung, Jl Mayor Sujadi No. 46 Tulungagung, Indonesia
5Prodi Pendidikan Guru Sekolah Dasar, STKIP Sebelas April, Jl Angkrek No. 19 Sumedang 45323, Indonesia
5Prodi Pendidikan Guru Sekolah Dasar, Universitas Syiah Kuala, Jl Tgk Hasan Krueng Kalee Banda Aceh 23111, Indonesia

Abstract
Assessments are prevailing implements for informing teachers and students approximately where student thoughtful stances with relation to a knowledge objective. However, limited readings deliver qualitative investigates of assessment through an item. This research practices a context of nine scopes of actual assessment evidence in science classrooms to associate more and fewer effective assessment among a purposive sample of elementary pre-service teacher in science. Contributing teachers collected five steps of assessment in reading, answering discussing, explaining, and creating related on problem solving skill. Our evaluation specified that actual dimensions, such as setting goals, aligning assessments with goals, occurrence, and selection of assessment, can be addressed relatively easily by teachers whose overall collection. Yet, dimensions that takings interested in account the quality or depth of student learning, such as the cognitive difficulty of the assignment, the type of response that is providing, or how well teachers adapt instruction based on information from assessments, differ more pointedly among teachers in our model. The conceptualization of these five dimensions beside with indication from actual classrooms across following instructional parts for professional improvement and teacher education

Keywords
RADEC, Science, Assessing, pre-service teacher

Topic
Chemistry Education

Link: https://ifory.id/abstract/KVTfvtMAm4Db

Corresponding Author
Eka Cahya Prima

Institutions
Universitas Pendidikan Indonesia

Abstract
The purpose of this research is to investigate the effect of lesson towards students- creative disposition and students- creativity in learning Newtons- Law and to investigate the relationship between students- creative disposition and students- creativity itself. The method that was used in this research was descriptive research. The sample was taken by cluster sampling technique which is joined by 77 students with the population of 8th-grade students at Junior High School in Garut. The data in this research is obtained through making a creative product and constructed questionnaire that is given to the students at the end of teaching and learning process. The result of the research shows that the lesson that was implemented in learning Newton Law built students- creative disposition. It is show on the result of creative dispositions questionnaire which has total average of 75.58%. Meanwhile, the lesson that was implemented in learning Newton Law built students- creativity in making the creative product. It shown on the result of a creative product that made which scored using Creative Measurement Tools (CMeT) and has total average about 73%. Students- creative disposition in learning newton law can build students- creativity in making the creative product. It can be proved by the result of correlation analysis using SPSS which is 0.593 that significant at the 0.05 level. Moreover, this research suggests the teachers to always make the lesson which is not only able to build students- creativity but students- creative disposition as well in another learning topics.

Keywords
Creative Disposition, Students- Creativity, Newtons Law, Descriptive Research

Topic
Integrated Science Education

Link: https://ifory.id/abstract/QfEXNdrHYL76

Corresponding Author
Neneng Sri Wulan

Institutions
Universitas Pendidikan Indonesia

Abstract
The background of this research is the need to develop multimedia in early reading learning. Development of this Augmented Reality-Based Multimedia is also as an effort to introduce ICT to children. This study aims to produce a multimedia learning, which combines the use of flash cards, android applications, and 3-dimensional images in the early reading teaching and learning. This research is based on Research and Development. The steps taken in this research process refer to Borg & Gall (2003) research stages: (1) research and data collection, (2) planning, (3) application development, (4) initial field trials, (5) ) revision of test results, (6) product improvement, and (7) field test. This Augmeted Reality Multimedia has been validated by experts and is tested on a limited and wide basis to elementary school students, parents, and elementary school teachers. The test considers functionallity, efficiency, and usability of this media. The test results show that the user response to this media is good / positive.

Keywords
Augmented Reality, Multimedia, Early Reading Learning

Topic
Integrated Science Education

Link: https://ifory.id/abstract/JrfZFK2cGdAb

Corresponding Author
Hertien Koosbandiah Surtikanti

Institutions
Departemen Pendidikan Biologi
Program Studi Biologi, FPMIPA UPI

Abstract
Water catchment area of Cilaja is located in along Giri Mekar and Sindanglaya village, Ujung Berung, Bandung. This river has high values for the people living surrounding that area. It supports clean water supply, coffee plantation, agriculture area and fish farming area. Field study is done to monitor water quality due to high variation of human activities. Three location sites (coffee/pinus plantation, agriculture and residential area) were selected. Bioindicator benthos were collected from these site locations. Chemical-physical water were measured and analysed. This biomonitoring study is done between year 2013-2017. The results show that based on the distribution and composition of bioindicator benthos, the three differrent land uses has good water quality within 5 years. People attitudes in environmental aware play an important role in conserving water quality for long period of time.

Keywords
water quality, bioindicator benthos, human activities, chemical water

Topic
Biology

Link: https://ifory.id/abstract/uwevGEF3tUkh

Corresponding Author
Vania Zhafirah

Institutions
1Departement of Science Education, Universitas Pendidikan Indonesia,
Jl. Dr, Setiabudi 229, Bandung 40154,Indonesia
2Departement of Physics Education, Universitas Pendidikan Indonesia,
Jl. Dr, Setiabudi 229, Bandung 40154,Indonesia

Abstract
Revolution industry 4.0 is really related to technology, in which the Internet and cloud computing create different opportunities and challenges for formal education systems.Blended Learning approach is one approach that combined online learning and face to face learning. The aim of this research was to investigate the effect of Blended Learning on students- motivation in learning the solar system for 7th-grade students. The method used in this research was weak experiment research.Research design in this researchis used byThe One-Shot Case Study. Participants in this research were 16 male studentssecondary schoolsat one Privat Junior High School in Bandung, Indonesia. The average score of students motivation that learning used Blended Learning is 68.88 and categorized as adequately. The percentageis93.75% of students are categorized as adequately motivated and 6.25% of students categorized as highly motivated. Based on the results showed that Blended Learning can be an alternative tool to enhance students- motivation

Keywords
Blended Learning, Students- Motivation, Solar System

Topic
Integrated Science Education

Link: https://ifory.id/abstract/LV7cZXWfAvUF

Corresponding Author
Rossy Andini Herindra Putri

Institutions
a) Department of Science Education, Faculty of Mathematics and Science Education, Universitas Pendidikan Indonesia, Bandung, Indonesia
*ekacahyaprima[at]upi.edu

Abstract
People with visual impairment are part of our society who have the same rights as a citizen which has limited mobility. They need technology to help navigation. Arduino is a microcontroller based technology which can be used to be walking assistance. We hereby propose ‘Bluino- as walking support for visual impairment students. It is equipped with an ultrasonic sensor HC-SR04 to detect an object within 50 cm, which will trigger the buzzer to produce sound. Bluino is packed into a custom box with a strap placed on the users leg. Three students have evaluated this device. The result shows that the tool can detect an object or obstacle in front of them so they can avoid it. The sensor can detect an object up to 4 meters and 15 degrees measuring angle. They suggested to improve Bluino by simplifying the model, and enabling the sensor to detect holes.

Keywords
Visual Impairment, Bluino, Arduino, Ultrasonic Sensor

Topic
Physics

Link: https://ifory.id/abstract/Qp7WmqdRAuGt

Corresponding Author
Shofiyyah Nadhiroh

Institutions
*Faculty of Mathematics and Natural Science, Padjadjaran University
Jalan Raya Bandung Sumedang KM.21, Jawa Barat 45363, Indonesia

Abstract
Cancer is a dangerous disease that should not be underestimated. The early stages of this disease are often asymptomatic. Early detection of cancer is an important examination so that the disease does not develop into a serious and dangerous disease. This study detected the presence of cancer through five predictors. This study classified the diagnosis results based on five indicators namely radius, texture, perimeter, area, and smoothness. By using these five indicators, the detection was carried out through a classification mechanism using the boosting method. The result had obtained an accuracy of 93.67%. The accuracy was higher than other classification methods such as Bayesian Networks and Multilayer Perceptron. Both of them only obtained an accuracy of 89.63%, and 92.79%, respectively. It showed that the ensemble method mechanism of boosting had proven to be more effective in classifying the presence or absence of breast cancer

Keywords
Breast cancer; Classification; Boosting; Bayesian Networks; Multilayer Perceptron

Topic
Computer Science

Link: https://ifory.id/abstract/TXYnCzNwg3ZP

Corresponding Author
Yayan Sanjaya

Institutions
UPI

Abstract
Capablity of Hermetia illucens to consume some weeds were conducted. This is an alternative way to reduce weeds in vegetable fields. A descriptive research was conducted by investigating role of BSF on some weeds, ki rinyuh (Chromolaena odorata), Babadotan (Ageratum conyzoides), rumput gajah (Pennisetum purpreum). Each was given BSF larvae with 150 g, 200 gr and 250 gr of weight on 500 gr weed, The result showed that BSF larvae at 50 mg of weight convert weed between 80- 100%, on 100 mg convert 75 % – 97 %, on 150 mg can convert 80 % -100 %. The mortality of BSF larvae on Chromolaena odorata was 90 %, Ageratum conyzoides was 75 %, Pennisetum purpreum was 40%. This showed BSF larvae can be convert weed into BSFlarvae biomass.

Keywords
Hermetia illucens, weeds, weight, bioconvesion

Topic
Biology

Link: https://ifory.id/abstract/yWLZ3dPuRMYw

Corresponding Author
Fida Rachmadiarti

Institutions
Universitas Negeri Surabaya

Abstract
Ludwigia adcendens and Ludwigia grandiflora are water weeds rapidly grow and disperse. This plant is mainly found in ponds, swamps, and polluted water channels. This means that both plants are capable of absorbing organic and inorganic waste, including heavy metals as Cd (cadmium). The objective of the research to describe capability of L. grandiflora and L. adcendens in Cd Solution at various concentration as individual species or as consortium. These plants were acclimatized first in hydroponic for 14 days, then moved to medium with varying treatments; only L. grandiflora, only L. adcendens and combination of both species at different Cd concentration (0, 5, 10, and 15 ppm). Level of Cd was analyzed at 7th and 14th day using Atomic Absorption Spectrophotometer (AAS), while wet biomass of each group was compared. Data collected was analyzed statistically. Capability of L. grandiflora and L. adcendens in Cd Solution from low to high was found to be L. grandiflora, L. adcendens > consortium of both species, in which bioconcentration factor (BCF) > 1 and translocation factor (TF) < 1. Concentration of Cd was also found to be higher in the roots than in leaves. Colour of leaves also supported these plants as Cd phytoremediator; plants with higher Cd accumulation had yellow leaves compared to plants accumulated lower Cd level.

Keywords
Ludwigia adcendens, Ludwigia grandiflora, BCF, TF, and Cd metal

Topic
Biology

Link: https://ifory.id/abstract/TBR6AafhYJwp

Corresponding Author
Muhamad Ariq Al Badar

Institutions
Department of Chemical Engineering, Politeknik Negeri Bandung
Jl. Gegerkalong Hilir, Bandung 40559, Indonesia
*haryadi[at]polban.ac.id

Abstract
The growth of the textile industry in Indonesia brings harm to the environment as disposal of wastewater to the river bodies still contains dangerous dyes. This affects the life of aquatic biota and the health of surrounding communities that use river water for domestic needs. To overcome this problem, N-doped Carbon Nanodots (N-doped CNDs) as photocatalysts can be used as an alternative in degrading Methylene Blue through photocatalytic process. N-doped CNDs from molasses have been successfully synthesized using H2O2 followed by the Microwave-Assisted Extraction (MAE) method. The synthesized N-doped CNDs possess average particle size of 1.5 nm observed by TEM. The properties of N-doped CNDs emit blue fluorescence under UV light 365 nm and show peak absorption at wavelength of 220 nm. Vibration peaks of OH, C-H, C = O, N-H, C-N functional groups are observed by FTIR at wavenumbers 3246.94 cm-1, 2929.06 cm-1, 1656.08 cm-1, 1590.27 cm-1 and 1036.98 cm-1 respectively. The success of nitrogen doping within CNDs is proven by FTIR analysis showing an increase of absorbance of C-N and N-H groups of N-doped CNDs. The potential of N-doped CNDs as photocatalysts for the degradation of methylene blue became the object of this study. The results showed that the degradation efficiency of methylene blue using 3 mL N-doped CNDs at pH 10 exhibited the most optimal degradation efficiency. Under these conditions, the degradation efficiency resulting from the use of 254 nm 11 W UV lamps and 14.5 W Philips LED lamps in 270 minutes is 96.8% and 97.2% consecutively.

Keywords
Methylene Blue; N-doped Carbon Nanodots; Molasses; Photocatalysts

Topic
Chemistry

Link: https://ifory.id/abstract/mBHgVzUx3nJ7

Corresponding Author
Siti Inna Zainab

Institutions
a) Departement of Physics Education, Indonesia University of Education Jalan Setiabudhi No.229, Isola, Bandung 40154, Indonesia *sitiinna85[at]gmail.com; mimin_iryanti[at]yahoo.com.
b)Departement of Geology Tanjungpura University Jalan Prof. Hadari Nawawi, Pontianak 78124, Indonesia.

Abstract
The usage of peatland received great attention especially for the cultivation of plantation crops. Soil fertility is determined by the soil texture which had an ideal fraction composition. The texture can also be used as a criterion of land classification and land suitability. Aloe vera was one of the leading commodities in West Kalimantan which well grown in peatland rather than in another type of land. This research aimed to determine the texture characteristic of peat soil on the land of aloe vera in West Kalimantan. The research method used sieve analysis and hydrometer. These measurements were carried out at the TekMIRA Testing Laboratory. The sieve analysis test result can be classified as soil texture in which using the USDA (United States Department of Agriculture) gradation concept. According to the soil texture classification by using USDA, this research obtained the data of sand texture had an average sand portion of 96.54%, silt average of 2.65%, and clay average of 0.81%. The portion of sandy clay texture was 87.57% sand, 8.27% silt, and 4.16% clay. While the texture of clay soil had a proportion of sand 5.10%, silt 36.50%, and clay 58.20%. In sum, the characteristics of the peat soil texture on the aloe vera soil classified in the texture of sand, sandy clay, and clay.

Keywords
Soil texture, Peat Soil, Aloe vera.

Topic
Physics

Link: https://ifory.id/abstract/KC6Dp2LRc3Vm

Corresponding Author
Wilda Naily

Institutions
a) Doctor of Environmental Science, Postgraduate School, Padjadjaran University
Jl Dipatiukur, Bandung 40132, Indonesia
*wilda.naily[at]gmail.com

b) Research Center for Geotechnologi LIPI
Jl Cisitu Sangkuriang, Bandung 40135, Indonesia

Abstract
Groundwater provides an overview of environmental conditions in an area. Chemical analysis of groundwater will provide information about the origin and quality of groundwater as a basis for groundwater utilization. In this paper, analysis is carried out by determining the water types of unconfined groundwater. Unconfined groundwater sample were taken from Southern Bandung. Measurement of major ion (sodium, potassium, magnesium, calsium, chloride, sulfate and bicarbonate), also pH and electrical conductivity were carried out in 16 groundwater samples. Paper discusses a) the classification of groundwater types determined by Kurlov method, b) the correlation of chemical properties in groundwater determined by Stiff method. Result showed that unconfined groundwater in Southern Bandung was dominated by calcium cations and bicarbonate anions, and water type were dominated by calcium – alkali – bicarbonate – chloride. Correlation of chemical properties in groundwater is seen in several location which show groundwater in the same flow and is fresh.

Keywords
Groundwater, Water type, Major ion, Calcium, Bicarbonate

Topic
Chemistry

Link: https://ifory.id/abstract/N8c7jhHMewbG

Corresponding Author
Betha Nurina Sari

Institutions
Universitas Singaperbangsa Karawang

Abstract
Forest fires are one of the disasters that needs to be anticipated in the Kapuas Hulu area. Forest fire prediction is one of the any forms of early warning in order to prevent from forest fires. C5.0 Classification algorithm can be used to build prediction models for forest fires. The purpose of this study is to apply C5.0 for prediction of forest fires. The method used is Knowledge Discovery in Datamining which consists of data selecting, data cleaning, data transformation, data mining, Knowledge Presentation. The results obtained are C5.0 able to produce prediction models of forest fires.

Keywords
Classification Algorithm, Datamining, Forest Fire, Kapuas Hulu

Topic
Computer Science

Link: https://ifory.id/abstract/FhkW8H3g7zJd

Corresponding Author
ANNA HENDRI SOLELIZA JONES

Institutions
a) Department of Informatics, Ahmad Dahlan University
a1) diahnuryunita[at]gmail.com
a2*) annahendri[at]tif.uad.ac.id
a3) dewi.soyusiawaty[at]tif.uad.ac.id

Abstract
Farmers are the main actors in agricultural development, have a major contribution in realizing Indonesias agricultural vision. To support the realization of agricultural production and productivity targets, the governments supports is by issuing policies to provide subsidized fertilizer assistance. The criteria for farmers who are eligible to receive subsidized fertilizer assistance are having land less than 1.9 hectares, have been a members of farmer groups, and having work as a farmer or a private employees. Data collection was carried out using the method of observation and interviews with farmer groups in Gunung Kidul. Data classification is done by applying the C4.5 algorithm to 300 data of prospective farmers receiving subsidized fertilizer assistance. Application development includes interface design, making data flow diagrams, implementation and testing. From the research that has been done by applying the C4.5 Algorithm with 300 data and 113 as a training data. Produce a data classification of farmers who are eligible to receive assistance at 88% accurate and targeted to the needs of farmers. This means that the C4.5 algorithm can be used as a classification for determining the eligibility of farmers to receive subsidized fertilizer.

Keywords
Keywords: Algorithm C4.5, Classification, Subsidized fertilizer, Farmers

Topic
Computer Science

Link: https://ifory.id/abstract/WFzLmp3PQudX

Corresponding Author
Rosa Ariani Sukamto

Institutions
Universitas Pendidikan Indonesia

Abstract
The computer program source code must have a good documentation on it in order to be more understandable by others. One of the documentation is comments. Therefore, the university students need to learn and able to write comments. Some university students are familiar with online judge as a tool for learning programming. Online judge usually does not check how the source code written instead of the output only. This research is aimed for implementing comment analysis module for online judge in order it can check the comments in the source code which is uploaded by students. The comments on this module are categorized as two parts. There are header and process comments. The comments data have taken from online judge which is used before as learning tool for basic programming subject. The data are divided into two groups. There are training group and test group. This module gives mark to the source code comments based on the categorized and similarity score between comments and the given problem.

Keywords
code comment, comment assessment, basic programming subject, online judge, source code

Topic
Computer Science

Link: https://ifory.id/abstract/MxdtCakh98Ku

Corresponding Author
Encum Sumiaty

Institutions
Department of Mathematics Education, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi no. 229, Bandung 40154, Indonesia

Abstract
According to study about convex function, A. W. Roberts and D. E. Varberg[17] have studied further. In this paper, we will introduce some basic properties about convex function and quasiconvex fucnction on R. Some comparison between properties of convex function and quasiconvex function will be presented also. Our results are quasiconvex function can be represented as monotone function either or at most as two combination of monotone functions, as consequences it is discontinuous mostly at countable points, and it is not differentiable at zero measure set only. However the results are still fundamental, but we will learn as clear as we can.

Keywords
Convex Function, Quasiconvex Function, Convex Function Space, Quasiconvex Function Space

Topic
Mathematics

Link: https://ifory.id/abstract/xtfe2AH6Trwz

Corresponding Author
Arip Solehudin

Institutions
a) Faculty of Computer Science, Universitas Singaperbangsa Karawang, Karawang 41361, Indonesia
*arip.solehudin[at]staff.unsika.ac.id, purwantoro.masbro[at]staff.unsika.ac.id, fahmi.yuda15047[at]student.unsika.ac.id
b)Department of Computer Science Education, Universitas Pendidikan Indonesia
munir[at]upi.edu

Abstract
Technology development is currently experiencing a fairly rapid increase, Therefore at the high school in Karawang intends to hold a grade promotion test using the Computer Based Test (CBT). However, in its implementation there are problems one of which is the server load. This is caused by user requests that exceed the servers capabilities. To overcome these problems, we use web server load balancing using haproxy. But the use of web server load balancing, often experience data inconsistencies per server. Therefore, database replication is also used that can guarantee data consistency in web server load balancing. This research uses descriptive approach with PPDIOO network system design method. There are 2 load balancing algorithms compared, namely round robin and least connection. Based on the httperf test results, throughput parameters of the two algorithms obtain the same average value of 99.5 Kb / second. In testing the response time parameter the least connection algorithm is superior at 6.9 ms compared to round robin which has an average value of 7.2 ms, but in testing the CPU Utilization parameter the round robin algorithm is superior at 23.7% compared to the least connection algorithm at 24.3%.

Keywords
Computer Based Test, web server load balancing, database replication

Topic
Computer Science

Link: https://ifory.id/abstract/FmKhj26aUEWz