Indonesia Conference Directory

Corresponding Author
Henry Setiyanto

Institutions
1Analytical Chemistry Research Group, Institut Teknologi Bandung, Bandung, Indonesia
2Research Unit for Clean Technology, Indonesian Institute of Sciences, Bandung, Indonesia
3Department of Physics, Universitas Negeri Malang, Malang, Indonesia

Abstract
The modification of carbon paste electrode (CPE) with molecularly imprinted polymer (MIP) for determination of rhodamine-B by potentiometry method has been studied. The experiments were performed using glutamic acid as a monomer. The composition of monomers, the number of electropolymerization cycles and pH of the solution were used to describe modification electrodes made (CPE-MIP-s) and the electrode characteristics were evaluated. It was observed the amount of oxidation current signal increase with increasing glutamic acid concentration. The optimal polymerization molar ratio of the functional monomer to the template molecule rhodamine-B was 3:1; the maximum number of electropolymerization was 15 and the optimum pH of supporting electrolyte solution was 4.

Keywords
CPE, MIP, polyglutamic acid, rhodamine-B

Topic
Chemistry

Link: https://ifory.id/abstract/dMyG4hzwZVr7

Corresponding Author
Dewi Muliyati

Institutions
Physics Education Department, Universitas Negeri Jakarta

Abstract
Physics has some material that is abstract, so it is difficult for students to learn. One of them is the concepts and phenomena of quantum. This research is focused on producing module that is equipped with Augmented Reality technology in AR Quantum application. The module and application developed aim to make it easier for high school students in 12th grade to understand concepts and phenomena of quantum. The research method used is development research method with the Dick and Carey model. The module that is developed applies the Discovery Learning model, consists of six stages. The module is equipped with images as a marker that will display 3D objects if scanned with a camera in the AR Quantum application. This research obtained data through a questionnaire with a Likert scale (points 1-5) and tests (pre-test and post-test). The questionnaire consisted of a feasibility test by expert lecturers in the Physics Education study program at UNJ and a product trial by teachers in SMA Negeri 6 Bekasi and 12th-grade students at SMA Negeri 1 Bekasi. In addition, other data in the form of pre-test and post-test results were tested with a gain test to obtain data on improvement of students- understanding related to the impact of using module. The results of the research obtained product feasibility test data of 95.9% for aspects of Physics material, 84.2% for aspects of instructional media, and 81.5% for aspects of Physics learning. The product trial results by the teacher gained a value of 94.3%, by students get 86.4%, and the results of gain test were 0.213. This shows that module equipped with Augmented Reality can illustrate concepts and phenomena of quantum into reality with excellent quality and are suitable for use as independent learning materials for students.

Keywords
3D modeling, Augmented Reality, Concepts and Phenomena of Quantum, Discovery Learning

Topic
Physics Education

Link: https://ifory.id/abstract/TetBK7ANvGFJ

Corresponding Author
Emma Mauren Moko

Institutions
Universitas Negeri Manado

Abstract
The abundant supply chain of lignocellulosic waste materials renders this biomass material as a potential source biomaterial for advance materials through various tranformation processes as such biological processes. Lignocellulosic biomass maybe transformed to advance biomaterials with the help of enzymes from extracelluler metabolics of microorganisms such as bacteria and fungi with capacities to hydrolyze lignocellulosic biomass to their smallest fractions. The role of auxiliary enzymes is an important phase in the efficiency of the hydrolyzation and degradation process of various large cellulolytic biomass. This research explores potential auxiliary enzymes in the form of Lytic Polysaccharide Mono-Oxygenases (LPMO) from fungi that are found in symbiotes of lycenes. These lycenes are endemic to trees growing in North Sulawesi in areas of Tomohon, Minahasa and North Minahasa. Molecular screening was conducted from identified fungi isolates, and based on partial genetical analysis on the locus of Internal Transcribed Spacer (ITS) of the fungi-s ribosomal DNA. Screening results discovered of fungi isolates identified as Trichoderma koningiopsis isolate HZA8 and isolate HZA6, Penicillium sumatraense strain CBS 127365 and strain CBS 130380, Trichoderma hamatum isolate PAN12-45 and isolate PAN12-05, Aspergillus aculeatus strain A1.9 18S, Aspergillus aculeatus isolate XSD-74, Trichoderma reesei strain S2606 and isolate 5A14.

Keywords
screening, auxiliary enzyms, fungus, lignocellulolytic

Topic
Biology

Link: https://ifory.id/abstract/xTzWHANwJ2Vc

Corresponding Author
Neena Zakia

Institutions
a) Division of Analytical Chemistry, Institut Teknologi Bandung
Jalan Ganesha 10, Bandung 40132, Indonesia
*neena.zakia.fmipa[at]um.ac.id
b) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang
Jalan Semarang 5, Malang 65145, Indonesia

Abstract
Alpha mangostin is a major component in the mangosteen rind, which has activity as an antioxidant, antitumor, hypo-allergenic, and anticancer. The aim of this study is to synthesize molecularly imprinted polymer (MIP) for alpha mangostin adsorption. The MIP was prepared by bulk polymerization with alpha mangostin as template, methacrylic acid as the monomer, ethylene glycol dimethacrylate as the crosslinker, and benzoyl peroxide as the initiator and acetonitrile as porogenic solvent. A molar ratio of template:monomer:crosslinker is 5:4:20. A non-imprinted polymer was synthesized in the absence of alpha mangostin. Solvent extraction is carried out to remove the template used methanol:acetic acid (90:10, %v/v) as the solvent. The surface morphology of MIP was visualized by scanning electron microscopy (SEM). The synthesized MIP was characterized by infra red spectroscopy. It showed that wavelength number were 2957, 1603, and 1456 cm-1 assigned to characteristic vibration of a C-H bond, a chelated carbonyl group and a methoxy groups, respectively, which indicated the present of template molecule. The adsorption capacity of MIP for alpha mangostin was 12,17 mg/g with the imprinting factor 1,2. Overall, this MIP has a good chance to be used as functional material for alpha mangostin adsorption.

Keywords
alpha mangostin, molecularly imprinted polymer, adsorption

Topic
Chemistry

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

Corresponding Author
Irma Widianingsih

Institutions
Universitas Pendidikan Indonesia

Abstract
Abstract. The aim of research were: (1) making conceptual, functional model and implementing multi criteria evaluation for vocational school zone based on geographic information system, (2) creating data base management system of vocational school zone based on geographic information system, (3) producing thematic map of vocational school zone based on geographic information system. Research location was in Bandung district. The research was conducted on January 2019 to July 2019. The research is using descriptive method. The research population is physical, chemical, biological and environmental conditions. The sampling technique is purposive. Research instruments are measurement and mapping tools, questionnaires, observations, computer hardware and software. Primary data taken by physical, chemical and biological environment. Secondary data taken are maps of soil texture, soil drainage, soil type, erosion, slope, effective depth of soil and flooding. Spatial analysis is used to superimpose layers, using GIS software. Themathic map which was producing multi criteria evaluation for vocational school zone based on geographic information system, from GIS software could be more accurate and effective than conventional and analog method.

Keywords
Multi criteria evaluation, vocational school zone, geographic information system

Topic
Computer Science

Link: https://ifory.id/abstract/8ZTHFyhGcb6E

Corresponding Author
St. Fatmah Hiola

Institutions
a) Biology Department, Universitas Negeri Makassar
b) Environmental Education, Universitas Negeri Makassar

Abstract
Natural orchids or wild orchids are often used as the main ingredient for obtaining commercial types of hybrids, but the existence of these wild orchid species is often threatened with extinction due to narrow land, because many are used for settlements, plantations or due to natural damage. In addition, the taking of orchids in nature without considering its sustainability. The purpose of this study was to explore information about community exceptions around the study area for the preservation of natural orchids. The subjects in this study were the community around Mallawa Resort, Bantimurung Bulusaraung National Park. This type of research is descriptive using survey methods by conducting interviews and distributing questionnaires to explore information about the needs of the community related to the conservation of natural orchids. The results revealed that basically the community around the Mallawa Resort area was familiar with natural orchid plants (65.93%) but knowledge of natural orchids and their preservation was still lacking (38.27). Generally, people have a caring attitude towards the existence of natural orchids (68.52%). This can be seen from the orchids that are owned by the community generally comes from nature (50.62%) and have been able to develop them (46.91%). However, only a few people feel the benefits of developing natural orchids (22.84%), and involvement in the conservation of natural orchids carried out by the government and other parties (11-38%). The conclusion of this study illustrates the need for an activity to preserve natural orchids through the development of a training model for the community around the study area.

Keywords
Conservation, Mallawa Resort, Natural orchids, Need analysis of community

Topic
Biology

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

Corresponding Author
Paquita Putri Ramadhani

Institutions
Department of Computer Science, Padjadjaran
University, Sumedang 45363,Indonesia

Abstract
Breast cancer is a type of cancer that has a high mortality rate. Cancer is caused by a lump from a collection of cells that grows and attacks the surrounding tissue. Most breast lumps are benign, but the benign breast lumps can increase the risk of developing breast cancer. It is important for everyone to check for a lump in the breast. It is done to find out whether the lump is potentially cancer or not. Early detection can provide better handling. The diagnosis of breast cancer by a doctor is done by analyzing several factors. To help the doctor in diagnosing the data efficiently, this study implemented machine learning. The diagnosis was based on the features of digital image computation in the process of fine-needle aspiration (FNA) of a breast mass. The data came from 569 patients. The study used the neural networks classification method with multilayer perceptron algorithms. The results were obtained that the use of neural networks gave higher accuracy if it compared it in the ZeroR method. Their accuracies were 95.96%, and 62.74%, respectively.

Keywords
Breast cancer, Neural Network Classification, ZeroR dan Multilayer Perceptron

Topic
Computer Science

Link: https://ifory.id/abstract/BPRDZQU7E4hj

Corresponding Author
Andang Sunarto

Institutions
1.IAIN Bengkulu, Indonesia.
2.Faculty of Science and Natural Resources,
Universiti Malaysia Sabah, Malaysia.

Abstract
In this study, we examines the effectiveness of the Preconditioned Accelerated Over-Relaxation (PAOR) iterative method together with an unconditionally implicit finite difference approximation equation to solve space-fractional diffusion equations (SFDE-s) by using the Caputo-s space-fractional derivative. For this, the implicit approximation equation and preconditioned matrix are used to construct the corresponding preconditioned linear system in which its coefficient matrix is large scale and sparse. Then, formulation and implementation the PAOR iterative method are also presented. Based on numerical algorithm results of the proposed iterative method, it can be concluded that the proposed iterative method (PAOR) is superior to the PSOR and PGS iterative methods.

Keywords
PAOR, Space-fractional diffusion equations, Implicit finite difference, Caputo-s

Topic
Mathematics

Link: https://ifory.id/abstract/fzh89ctnkVqW

Corresponding Author
Adhi Rizal

Institutions
(a) Faculty of Computer Science, Universitas Singaperbangsa Karawang, Karawang 41361, Indonesia
*adhi.rizal[at]staff.unsika.ac.id
(b)Department of Computer Science Education, Universitas Pendidikan Indonesia
munir[at]upi.edu

Abstract
It is predicted that every year, online video traffic will continue increase significantly. This causes before digital video transmitted over the internet, a compression mechanism is required by using specific encoding technique so that it does not overload the senders and receivers traffic. Furthermore, this process is also needed to produce high quality video with low bitrate. At present, the latest video encoding techniques is H.264/AVC and the currently developing video encoding is H.265/HEVC. Therefore, this paper aims to carry out objective assessment by evaluating the encoding performance of the new standard compared to its predecessor H.264/AVC. In addition to produce a comprehensive investigation, we compared several resolutions (1080p, 720p, and 480p) with a combination of CRF (Constant Rate Factor) values and different encoder presets. Then to find out the performance of both techniques we used several test parameters such as encoding duration, compression ratio, bitrate, MSE, and PSNR. The results showed that H.264 was faster in terms of time needed to carried out the encoding process. Furthermore, the quality of the video output produced by H.264 also better, but not significant, only a slight difference with H.265 and it is cannot be seen directly. In addition, the compression ratio and bitrate of H.265 was better than its predecessor with a difference of 38.5% and 52.7%, respectively. Finally, if the user wants to prioritize better quality video output without having to sacrifice a lot of compression time and small file size, then our recommendation is to use H.265 encoding and by selecting an HD resolution configuration (720p) with medium presets and 18 CRF value.

Keywords
objective quality assessment, video encoding, H.264/AVC, H.265/HEVC, CRF, encoder preset

Topic
Computer Science

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

Corresponding Author
Sumanang Muhtar Gozali

Institutions
UPI

Abstract
In this paper we review the main properties of cyclically ordered groups . Moreover, for two cyclically ordered groups A and B, we construct a cyclic order on the direct product A×B.

Keywords
cyclic order, cylic ordered group, direct product

Topic
Mathematics

Link: https://ifory.id/abstract/7GkyBW8zbVq3

Corresponding Author
Nanang Hunaifi

Institutions
a) AMIK BSI BANDUNG
Jl. Sekolah Internasional 1-2, Bandung 40282, Indonesia
*masnaing[at]gmail.com
b) AMIK BSI Tasikmalaya
Jl. Tanuwijaya No.4, Tasikmalaya 46113, Indonesia
agung.abl[at]bsi.ac.id
a) AMIK BSI BANDUNG
Jl. Sekolah Internasional 1-2, Bandung 40282, Indonesia
maxsiary[at]gmail.com

Abstract
Population registration management is the government responsibility, so that each resident is registered administratively in accordance with the Act. However, to make a certificate, the people may not be directly served. The issue of extortion and complicated processes makes the people feel the data management is a complicated and make people often ignore it, this is a loss for all parties. One of the negative impacts of not recording population data is that there is a dual identity of the population that can be misused; unknown newcomers are often used for terrorism activities, obstruction of other arrangements that require a certificate of population. Currently the data processing and archiving process is still done manually. This research aims to develop a document archiving information system and online mail application at the sub-district level. This system was designed with the waterfall method and Unified Modeling Language (UML) modeling, and then implemented using the PHP MySQL web programming. Black box is used as a functional testing of information systems. The results of this study is the document archiving information systems and online mail requests have been developed with positive responses from users by 84.50% based on the user acceptance test level questionnaire.

Keywords
egoverment; information system; internet; population; website

Topic
Computer Science

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

Corresponding Author
Anggun Mayang Sari

Institutions
(a) Research Center For Technology, Indonesian Institute of Sciences (LIPI), Jl. Sangkuriang, Bandung 40135,Indonesia
*anggunmayangsari[at]gmail.com

Abstract
As one of the largest cities in Indonesia, Bandung city consists of dense populations that geologically surrounded by earthquake hazard. Rapid structural-building and infrastructure facilities development forced the local government to put a concern about the dynamic impact. Therefore, a study on Peak Ground Acceleration (PGA) bedrock to analyse seismic hazard is a necessity. This study used the latest updated seismic sources data to model seismic ground motion to particular location. Here, Probability Seismic Hazard Analysis (PSHA) methods were applied using EZ-FRisk and OpenQuake software. These two methods developed to show some variety models of peak ground acceleration value on bedrock. Ez-FRisk models used randomly 9 points locations, while OpenQuake used gridded points to the whole Bandung city to generate PGA analysis. As a result, PGA bedrock using EZ-FRisk software ranged between 0,48-0,62g, while OpenQuake showed 0,46-0,63g. These results validated using Indonesian Hazard Map 2017 using PGA on 2475 years return period, represented similar values about 0.50-0.60g. In order to provide spatial information, these results visualised using Geographic Information System (GIS) application. Furthermore, this study expected to give contribution on scientific information for the development planning, especially for designing earthquake resistant buildings.

Keywords
PGA Bedrock; PSHA; EZ-Frisk; OpenQuake; GIS

Topic
Physics

Link: https://ifory.id/abstract/DHZ8jfnbVkmw

Corresponding Author
Shelly Efwinda

Institutions
a) Physics Education, Faculty of Teachers Training and Education, Universitas Mulawarman, Jl.Muara Pahu Kampus Gunung Kelua, Samarinda 75123, Indonesia
*shelly.efwindaa[at]gmail.com
b) Science Education, School of Postgraduate Studies of Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi No.229, Bandung 40154, Indonesia

Abstract
Pedagogical Content Knowledge (PCK) is the ability to teach a content on a particular concept so students can master the concept correctly. One characteristic of qualified teacher is having excellent PCK ability. The purpose of this study is to obtain an PCK ability profile of prospective physics teachers in reflecting project-based learning (PjBL) that had been carried out. This research is a qualitative research with narrative research design. The data collection instrument in this study is Pedagogical and Professional-experience Repertoires (PaP-eRs). The subjects in this study are 13 physics students (prospective teachers) in one of State University of East Kalimantan. The results shows that the average value of PCK ability of prospective physics teachers in reflecting PjBL is 50% in sufficient category. Based on the results of study, academics or stakeholders need to add adequate facilities as a means for students to practice teaching, develop teaching materials, and master the concept of physics better.

Keywords
Pedagogical Content Knowledge (PCK); Project based Learning (PjBL); Professional-experience Repertoires (PaP-eRs)

Topic
Physics Education

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

Corresponding Author
Ahmad Aminudin

Institutions
Departemen Fisika, Universitas Pendidikan Indonesia
Jl. Dr.Setiabudi No.229 Bandung, Jawa Barat Indonesia

Abstract
Peristaltic pump RPM counter using rotary encoder has been designed. Peristaltic pump is a pump which using flexible tube as a tool for transporting fluid due to the pressure roller on the rotor. The rate of fluid flow in the flexible tube is affected by the angular speed of the motor (ω) in RPM. There are many available peristaltic pumps with a various selection in the market but rarely equipped with RPM measurement system. In this research, the peristaltic pump used three rollers and a flexible tube with the inner radius (rd) 0.21cm. The two main part on the rotary encoder are encoder disk with an index of 36 and a sensor optocoupler chip. Output rotary encoder signal is processed in such a way on the microcontroller into the value of angular speed (ω) in RPM and the linear velocity (v) in cm / min. Then, the results of this calculation is displayed on the LCD. The operating voltage range of peristaltic pumps which can be used are 1.5 to 9.0 V. At this voltage range, the peristaltic pump produce angular speed in a range of 3.76-33.83 RPM. RPM counter system of the peristaltic pump which has been made could measure RPM well with a percentage of the average accuracy percentage of 99.51% and average error percentage of 0.49% of the value of RPM results of manual calculations. The volume flow rate which has been calculated was 8.9407 – 65.0959 ml/min and the volume flow rate which has been measured was 37.1518 – 66.5199 ml/min.

Keywords
Performance Test, Peristaltic Pump, Flow Measurement, Encoder

Topic
Physics

Link: https://ifory.id/abstract/B8Avr3TY9en4

Corresponding Author
Budi Utami

Institutions
Universitas Sebelas Maret Surakarta

Abstract
21st century skills are very important for students, Communication, Collaboration, Critical Thinking and Problem Solving, and Creativity and Innovation (known as 4 C). Faciones critical thinking skills include interpretation, analysis, evaluation, inference, explanation, and selfregulation. This study is to determine the ability of students analytical thinking skills in chemistry lessons in Chemical Equilibrium material and to determine the suitability of the items of performance assessment rubric on the assessment of students analytical thinking skills. The study used a quantitative descriptive method and was analyzed using the RASCH model. The research subjects were XI gradeof science students in one of the high schools in Surakarta, Central Java, Indonesia. The results of the study revealed that there were still students with low analytical skills so that appropriate learning models were needed that could improve students analytical skills. Based on the results of the analysis of the RASCH model it is known that item measurement for each item in the rubric of performance assessment is a good category and can be used to measure students analytical skills.

Keywords
performance assessment rubric, analytical thinking skills, chemistry lesson

Topic
Chemistry Education

Link: https://ifory.id/abstract/9nYve28rVRbt

Corresponding Author
Fitri Indra Indikawati

Institutions
Universitas Ahmad Dahlan

Abstract
Stress detection is an interesting topic because of its huge impact on human health, both mentally and physically. Physiological changes on the human body can be observed and used to recognize stress. Various approaches utilize a different kind of data to detect physiological changes, i.e. visual data, audio data, interview result, textual data, or sensor data. Wearable sensors for collecting physiological data are becoming more prominent in recent years due to their functionality and non-intrusive nature. By utilizing data from wearable sensors, we have developed a personalized stress detection system. Our system performs classification on stress level based on multimodal data from Empatica E4 wearable sensor. By evaluating the performance of the system, we demonstrate that our system can perform personalized stress detection using a real multimodal dataset from wearable sensor.

Keywords
stress detection, wearable sensor, classification

Topic
Computer Science

Link: https://ifory.id/abstract/k3ZABvqU9Kpr

Corresponding Author
Heli Siti Halimatul Munawaroh

Institutions
UPI

Abstract
Phycocyanin is the main pigment in Spirulina platensis which is reported has potential to be used as a natural inhibitor for α-amylase and α-glucosidase. The pigment can effectively treat type-2 diabetes mellitus by lowering blood glucose. However, molecular interactions between phycocyanin and the two enzymes are less studied. In this study, an in silico study through molecular docking simulation was carried out to predict the molecular interactions of phycocyanin and both of α-amylase and α-glucosidase. In vitro evaluation of phycocyanin as an anti-diabetic is determined through the inhibitory activity of phycocyanin against α-amylase derived from human saliva. Storage stability in three conditions was evaluated in its application as a functional supplement. Docking simulations between phycocyanin and acarbose as commercial drugs with α-amylase and α-glucosidase enzymes were performed using the AutoDock Tools program. Determination of inhibitory activity was carried out using the FUWA method, while the measurement of absorption values with a UV-Vis spectrophotometer. Storage stability study was performed on solid and solutions-stated of phycocyanin at three different conditions, namely dark conditions at -4°C, dark conditions at room temperature, and bright conditions at room temperature. The stability was determined by measuring the absorption values at λ620 and λ652 using UV-Vis spectrophotometer. Molecular docking simulations show that phycocyanin, inhibits by binding to the active site of the enzyme, causing disruption of the attachment of the substrate to the enzyme. The simulation indicates that phycocyanin has potency to be used as a candidate for anti-diabetic natural therapy agents. An in vitro inhibition activity test showed that phycocyanin inhibits α-amylase from human saliva at average 50.13%. Storage stability tests showed that the concentration of phycocyanin in the form of solutions and solids, was stable for seven days of testing under conditions of dark storage and low temperatures.

Keywords
Diabetes mellitus type-2, Phycocyanin, Molecular Docking, Stability, α-amylase, α-glucosidase

Topic
Chemistry

Link: https://ifory.id/abstract/BjcEZ4LXnm8U

Corresponding Author
Dewi Muliyati

Institutions
Physics Education Department, Universitas Negeri Jakarta

Abstract
This study aims to produce a physics textbook enriched Augmented Reality. The book that has been produced can be used as a technology-based source of learning for high school students 10th grade 1st semester. The book is presented in multi-representation in the form of pictures, tables, graphics, exposure, sample problems, 3D animation, and video. 3D animations or videos are displayed through Augmented Reality application with android operating system. The research was conducted by research and development method of Dick and Carey model. Instruments used in the form of Likert scale questionnaire. The research data were obtained from material experts, media experts, physics teachers, and high school students 10th grade then analyzed using a Likert scale and gain test. The results of validation by material experts get a value of 88,16% for the nature of physics and measurement; 94,06% for vectors; 94,96% for linear motion kinematics; 88,5% for two-dimensional motion (parabolic motion); and 88,76% for circular motion. The results of validation by instructional media expert get a value of 88,17%. User trials by teachers get a value of 92,86% and by students get a value of 90% and an increase in the cognitive abilities of high school students 10th with a value of 0,35. It can be concluded that this physics textbook enriched with augmented reality technology is worthy of being used as a learning source in physics learning.

Keywords
textbook, augmented reality, physics

Topic
Physics Education

Link: https://ifory.id/abstract/dUrpHvLVT2B8

Corresponding Author
Anggita Hafsari

Institutions
Departement Biologi, Faculty of Science dan Technology, UIN Sunan Gunung Djati Bandung, Jl. A.H. Nasution No.105 Bandung. Cipadung, Cibiru, Kota Bandung, Jawa Barat 40614, Indonesia

Abstract
The purpose of this research is to determine the the best media form different seeds media for the growth of pink oyster mushroom mycelium (Pleurotus flabellatus) and the secondary metabolite composition as anti-tumor drugs. The method used was the experimental research method, one factorial Completely Randomized Design with four treatments on different seeds sources in solid and liquid media. To determine the best media we compare the weight of biomass and the secondary metabolites composition. The results showed that the growth of corn media diameter had the fastest growth rate of 86% and 82% control, 61% significantly different in soybeans and 63% in green beans. Biomass results show that the most effective media to obtain biomass is that the green beans have a weight of 26 mg and corn 25.6 mg, while potatoes are 14.7 mg and soybeans 5.9 mg. All carbohydrates media can be used as a medium for the growth of pink oyster mushroom mycelium. The secondary metabolites detected were alkaloids and saponins, while steroids and tannins were not detected in all samples, so pink oyster mushrooms have the potential to have antitumor content.

Keywords
Pink Oyster Mushroom, Pleurotus flabellatus, Metabolites Secondary, Antitumor

Topic
Biology

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

Corresponding Author
Siti Rohmah Rohimah

Institutions
UNJ

Abstract
The AIDS Commission (KPA) recorded the highest number of sufferers of Human Immunodeficiency Virus (HIV) and Acquired Immune Deficiency Syndrome (AIDS) in East Jakarta in DKI Jakarta. This study aims to determine the factors that influence spatially and non-spatially on the number of people with HIV / AIDS in East Jakarta. The results of this study are expected to be useful in eradicating HIV / AIDS, especially in East Jakarta and generally for other regions that have the same characteristics as East Jakarta. The parameter estimation method in this study used the maximum likelihood method. The results showed that spatial and non-spatial factors had a significant effect with alpha 5%. In addition, the addition of spatial factors gave smaller standard error value. Therefore, it can be concluded that the Poisson autoregressive spatial model provided better parameter estimation results than the Poisson regression model.

Keywords
HIV / AIDS, Spatial Autoregressive Poisson, Poisson Regression, Maximum Likelihood

Topic
Mathematics

Link: https://ifory.id/abstract/PdzBT7jw6WnG

Corresponding Author
Hernawati Hernawati

Institutions
Departement of Biology Education
Universitas Pendidikan Indonesia
Bandung

Abstract
Amphibians can be used as environmental bioindicators or health measures of an environment because they are sensitive to changes in environmental factors. Some of the main habitat of amphibians are primary and secondary forests, swamps, rivers, lakes and ponds. One of the endangered amphibians were Rhacophorus reinwardtii. The secondary forest in Ranca Upas Ciwidey was one of the habitat where Rhacophorus reinwardtii can be found. There are many significant changes to this region due to the expansion of the campground and tourist areas, thus affecting the population of Rhacophorus reinwardtii. This study aims to describe the habitat characteristics and population estimation of Rhacophorus reinwardtii in the secondary forest Ranca Upas. Habitat characteristics were analyzed descriptively. Habitat and population data are collected in two locations near rivers and stagnant water. The research area has measured 522m2 and width of 528m2. Capture-Mark-Release-Recapture Method was used in each region to collect population data. Population abundance were calculated using the Schnabel formula, population distribution were estimated using the Morista index. The caught frogs were marked using a modified shoelace. Habitat Rhacophorus reinwardtii was of river and stagnant water with an altitude of 1630-1680m asl, pH of water neutral and acidic, average velocity of the river was 0m/s and 0.04m/s, the water substrates were sand and mud, with average temperature air 16.7ºC and 17ºC, average water temperature of 14.7ºC, average humidity of air 94%. The type of plant that is often the habitat of Rhacophorus reinwardtii was Brugmansia sp. and Cyathea sp. The population estimation of the two observation areas were 45 individuals and 30 individuals with a density of 9 individuals/100m2 and 6 individuals/100m2. It can be concluded that the population distribution of Rhacophorus reinwardtii in both habitats clustered.

Keywords
Keywords: Rhacophorus reinwardtii, habitat, abundance, density, distribution.

Topic
Biology

Link: https://ifory.id/abstract/v3exZcFGdHma

Corresponding Author
Endang Sulistyarini Gultom

Institutions
Universitas Negeri Medan

Abstract
The purpose of this study was to isolate secondary metabolites from the ethanol extract of chirinyuh leaves (Cromolaena odorata) which have the potential to be anti-bacterial. The results of this study are expected to get an additional inventory of medicinal plants and in the long run add to the economic value of marketable herbal medicines. The planned method is to obtain extract by maceration of Harborn (1987) method, then the extract activity test which is highest in antibacterial was carried out. To test the antibacterial activity, a diffusion method is used. Furthermore, the extract which has the highest antibacterial activity was identified to be continued to the next stage. Based on the results obtained, the ethanol extract of the kirinyuh leaf contains secondary metabolites of flavonoids, alkaloids, tannins and saponins which have antibacterial activity. This was obtained from the ability of the extract to inhibit the growth of Staphylococcus aureus, Eschericihia coli, and Pseudomonas aeruginosa test bacteria with inhibitory zones of 12 mm, 16 mm, and 7 mm respectively. The MIC value of each test bacterium was different depending on the type of bacteria where the growth of Staphilococcus aureus was inhibited at a concentration of 6%, Eschericihia coli 3%, and Pseudomonas aeruginosa 12%.

Keywords
Secondary metabolites, Cromolaena odorata, Antibacterial, Chromatography.

Topic
Biology

Link: https://ifory.id/abstract/WQ3HDn7UMTjg

Corresponding Author
Tri Nopriana

Institutions
Universitas Swadaya Gunung Djati

Abstract
Good candidates for mathematics teachers are those who have good thinking skills especially in mathematics, good habits of mind and the ability to survive under pressure. Those skills are reflected in the level of geometric thinking, the level of logical thinking, the scale of habits of mind and resilience in mathematics. The purposes of this study were to analyze the achievement of the level of geometric thinking, the level of logical thinking of pre-service mathematics teachers, describe the habits of mind and student resilience in mathematics. The research subjects consisted of 30 mathematics education students at FKIP Swadaya Gunung Djati University (UGJ) as pre-service mathematics teachers who would practice by teaching in schools. The instruments in this study were: (1) van Hieles geometrical thinking test developed by The Cognitive Development and Achievement in the Secondary School Geometry Project (CDASSG), (2) the logical thinking test (TOLT) designed by Tobin and Capie, (3) The Habits of Minds Scale, and (4) Mathematical Resilience Scale with 4 categories of Likert models. The results of the study were that pre-service mathematics teachers achieved: (1) the level of van Hieles geometrical thinking at the stage of informal deduction, (2) the level of logical thinking at the formal thinking stage, meaning pre-service mathematics teachers were able to solve problems related to proportional reasoning, variable reasoning, correlational reasoning, and combinatorial reasoning. Furthermore, on the soft skills, pre-service mathematics teachers have (3) habits of mind in the good category with an average achievement of 74.5%, this is also seen in achievement (4) the resilience in mathematics who have a good category with an average achievement of 73.6%. Based on the results of the study, it can be concluded that overall the pre-service mathematics teachers in FKIP UGJ have good abilities in geometrical and logical thinking, the habits of mind and resilience in facing mathematical problems.

Keywords
Van Hieles Geometry Thinking, Logical Thinking, Habits of Mind, Resilience in Mathematics

Topic
Mathematics Education

Link: https://ifory.id/abstract/7XjMLedZaAm6

Corresponding Author
E Eliyawati

Institutions
a) International Program on Science Education Study Program, Universitas Pendidikan Indonesia, Jalan Setiabudi no 229, Bandung, Indonesia
*eliyawati[at]upi.edu

Abstract
Chemistry deals with lots of concepts ranging from simple to more complex as well as concrete to abstract. Understanding of chemistry is needed mainly by pre-service science teachers. The purpose of this study was to investigate the understanding of preservice science teachers about chemical multiple representations at macroscopic, symbolic, and sub-microscopic levels. This study involved twenty-seven preservice science and data were collected using chemical multiple representations table. Results indicated that most of pre-service science teachers could not describe the substances when it is dissolved in water at macroscopic, symbolic, and sub-microscopic levels. A few of pre-service science teachers couldnt write correctly the symbolic level of potassium chloride. All of them couldn-t write correctly the ionization reaction of acetic acid and also describe the molecular view of acetic acid solution. Generally, they had some difficulties in investigating macroscopic, symbolic, and sub-microscopic levels nor integrating these levels with the contents.

Keywords
Pre-service science teachers, macroscopic, symbolic and microscopic levels

Topic
Integrated Science Education

Link: https://ifory.id/abstract/9pQbnU86LyKG

Corresponding Author
Syifa Fauziyah Nurul Islam

Institutions
a,b) Department of Computer Science, Padjadjaran University, Sumedang 45363, Indonesia
*syifafauziyah899[at]gmail.com

Abstract
Cardiotocography is an important process in pregnancy as fetal monitoring. It monitors the babys heart rate in a healthy condition or not. Apart from that, this can also measure whether the movements carried out by the baby in the womb are normal or not. This study extracted the recording data by cardiotocographs. The attributes of fetal data that have been recorded amount to 22. They were used as the indicators in determining the conditions of the fetus whether under normal circumstances, suspect or pathologic. The prediction of the fetus condition was based on the Random Forest method. Also, the method was compared with the Naïve Bayes and Decision Tree methods. The accuracy of the Random Forest method reached 95.12%. It was higher compared to using other methods.

Keywords
Cardiotocography; Radom Forest; Naive bayes; Decision Tree

Topic
Computer Science

Link: https://ifory.id/abstract/EVNn3cdWbJtL

Corresponding Author
Erman Erman

Institutions
(a) Science Education Department, FMIPA, Universitas Negeri Surabaya

(b) Science Education, Universitas Islam Negeri Sunan Ampel Surabaya

Abstract
Abstract This study aims to predict science teachers- familiarity on high order thinking skills (hot). As many as 44 members of science teacher community in a district in East Java volunteered to participate in this study. Data were collected using some common keywords in science learning in the form of multiple choice test and questioner, and analyzed descriptively using content analysis. The results showed that: 1) more than half of teachers are not familiar with hot, although they have often heard the terms, 2) conceptually, less than 50% of teachers are familiar with the type of hot skills, but are quite familiar with its application in learning, and 3) teachers are quite familiar with terms related hot in classroom, but are still have difficulty explaining the learning that stimulates hot among student. To train student to think hot, it is not sufficient to just be familiar with the term but must understand and able to operate it sustainably and consistently.

Keywords
common keywords, hot familiarity, science teacher

Topic
Integrated Science Education

Link: https://ifory.id/abstract/RBMrGhtJkbx8

Corresponding Author
Al Jupri

Institutions
Departemen Pendidikan Matematika, FPMIPA, Universitas Pendidikan Indonesia

Abstract
This research aims to predict grade VIII students- thinking for the learning of system of linear equations in two variables. To achieve this, first, we surveyed algebra education literature and Indonesian school mathematics textbooks for collecting information about a learning sequence for the topic of system of linear equations in two variables. Second, based on the first step, we designed a sequence of learning for this topic according to the theory of realistic mathematics education and made predictions about student thinking process particularly on solving relevant problems in this topic. The results consisted of a sequence of algebra tasks and various predictions of student thinking for learning algebra. In conclusion, we consider that predictions of student thinking process can be used by the teacher for anticipating the actual learning process either for helping students who encountering difficulties or for teaching actions to invite students problem solving skills.

Keywords
Algebra education, system of linear equations in two variables, hypothetical learning trajectory, design of mathematics learning

Topic
Mathematics Education

Link: https://ifory.id/abstract/G8EJDu3fmx4z

Corresponding Author
Ferry Cahyadi

Institutions
UPI

Abstract
Ocean literacy is an understanding of the ocean and its influences. As a maritime nation and the worlds largest archipelago country, the education systems in Indonesia should contain ocean literacy. Based on scientific publication indexes such as Google Scholar and Scopus, there is no known research on ocean literacy in Indonesia. This study tries to translate the International Ocean Literacy Survey v4 into Bahasa Indonesia and validate its content to ocean scientist. A trial was conducted on first-year college students with a science major at the high school level. Preliminary results indicate that most of them have difficulty answering ocean literacy questions.

Keywords
ocean literacy, indonesia, preliminary result

Topic
Integrated Science Education

Link: https://ifory.id/abstract/Nha2eEzjt6VP

Corresponding Author
Fitri Khoerunnisa

Institutions
a) Department of Chemistry, Indonesia University of Education Bandung, Indonesia 40154
b) Clean Technology Research Division, Indonesian Institute of Science, Bandung, Indonesia, 40135
c) Department of Chemical Engineering, Bandung Institute of Technology, Bandung, Indonesia, 40116

Abstract
This study aims to prepare and to investigate the physicochemical properties of superabsorbent hydrogels (SH) based on poly (vinyl alcohol)/ poly (ethylene glycol) with an aid of glutaraldehyde crosslinker. The SH was synthesized using solution mixing method. The physicochemical properties of synthesized SH were determined by means of FTIR spectroscopy, X-ray diffraction, scanning electron microscopy, thermal gravimetric analysis, tensile strength, swelling ratio, and water retention tests. The results revealed that the optimum volume ratio of PVA (2.5% w/v): PEG (2.5% w/v): GA (3.33x10-5 % v/v) composition on SH was 2:3:3. The predominant interaction between polymer precursors involved functional moieties of C–O/C–O–C, C=O, C–H and –OH via hydrogen bonding. Copolymerization with PEG was not only modified crystallinity, tensile strength, thermal stability, and elasticity but also improved porous structure of PVA. The synthesized SH has huge water absorption capacity with water swelling ratio (% SR) and water retention (% WR) of 1230% and 53%, respectively.

Keywords
Superabsorbent; hydrogel; PVA; PEG

Topic
Chemistry

Link: https://ifory.id/abstract/xNUap2jWQeYw

Corresponding Author
Dwi Sulisworo

Institutions
Graduate Program of Ahmad Dahlan University

Abstract
Many teachers have applied cooperative learning in class to achieve learning competencies. This study aims to develop SSP in cooperative learning with the REACT strategy (React (Relating, Experiencing, Applying, Cooperative, Transferring) to physics in tenth-grade student. The experts gave qualitative judgment to verify the SSP before teacher used it to arrange the learning environment in the classroom. The research design used in this implementation to find out the learning effects was a pretest-posttest controlled group design. The learning competencies measured were on the ability of analysis and synthesis using five essay questions. Scoring used a weighted score for each step in solving the essay problem. The statistical analysis is ANOVA to compare the two groups. The results indicate that learning with REACT strategies had a better impact than conventional learning. The completeness of learning tools is one of the essential factors to achieve competency in learning cooperative learning.

Keywords
cooperative learning, higher order thinking skills, ICT in education, subject-specific pedagogy

Topic
Integrated Science Education

Link: https://ifory.id/abstract/3UjTNL4x9aKv