Indonesia Conference Directory

Corresponding Author
Rini Puspitaningrum

Institutions
1Dept. of Biology, Universitas Negeri Jakarta. Jalan Rawamangun Muka 13220. Jakarta Indonesia
2 Dept of Physics. Universitas Negeri Jakarta. Jalan Rawamangun Muka 13220. Jakarta Indonesia

Abstract
Myoglobin is a hemoprotein with the important roleof being the binding and storage agent of oxygen in tissues. That is why it is important to study the existence of myoglobin in hypoxia tolerant animals, such as the green sea turtle (Chelonia mydas). This study aims to detect myoglobin protein in green sea turtle (Chelonia mydas) organs which consume highly concentrated O2 using spectrophotometry and immunodotblottechniques. In this study, the myoglobin protein of the heart, brain, and liver was analyzed using spectrophotometry at ƛ503nmand immunodot blot techniques with the antibody – anti myoglobin of the green sea turtle (Chelonia mydas). The results obtained is that the myoglobin protein is detected in all organs. The lungs are the organ with the lowest concentration of myoglobin protein from all the test organs. Based on the study results, it can be concluded that genetically, the green sea turtle (Chelonia mydas) would evolve as a tolerant animal toward hypoxia.

Keywords
myoglobin, hypoxia tolerant, green sea turtle (Chelonia mydas), organs which consume highly concentrated O2

Topic
Biology

Link: https://ifory.id/abstract/bcuvyg9aMwdC

Corresponding Author
Rini Puspitaningrum

Institutions
1Dept. of Biology, Universitas Negeri Jakarta. Jalan Rawamangun Muka 13220. Jakarta Indonesia
2 Dept of Physics. Universitas Negeri Jakarta. Jalan Rawamangun Muka 13220. Jakarta Indonesia

Abstract
Myoglobin is an intracellular protein which has a vital role in maintaining oxygen hemostasis within living tissue. This protein has the ability to bind and send oxygen to mitochondrial membrane to enable transduction of energy. The liver is the biggest organ in the bodyand has complex functions. Based on the complex functions, liver needs quite a big amount of oxygen, so the metabolism process can be performed well. This study aims to detect mRNA expression in the liver of rats (Rattus novergicus) in normoxia. The study was conducted at the Biochemistry and Molecular Biology Laboratory of the Biology Major of the Faculty of Mathematics and Natural Sciences, UNJ. This study utilized quasi-experiment method. The study results show that myoglobin mRNA is expressed in the liver of rats (Rattus novergicus) in normoxia on 114 pb. This result can create a new paradigm towards myoglobin gene that this gene might be a constitutive gene. This information can be the basis that living tissues have strategies for mechanism of adaptation towards low oxygen environment by increasing the expression of myoglobin in the tissue.

Keywords
myoglobin mRNA, liver, normoxia, Rattus novergicus

Topic
Biology

Link: https://ifory.id/abstract/nEt379AjrcWb

Corresponding Author
Rini Puspitaningrum

Institutions
1Dept. of Biology, Universitas Negeri Jakarta. Jalan Rawamangun Muka 13220. Jakarta Indonesia
2 Dept of Physics. Universitas Negeri Jakarta. Jalan Rawamangun Muka 13220. Jakarta Indonesia

Abstract
Myoglobin has an important role in maintaining the oxygen homeostasis within living tissues. Therefore, the existence of myoglobin is very important to be studied in hypoxia tolerant animals, in this case the Brazilian turtle (Trachemysscriptaelegans). This study aims to detect myoglobin expression in the heart, kidney and lung of Brazilian turtle using the myoglobin primers Myoturtle_F2 and Myoturtle_R1. This study was performed using the RNA total of the heart, kidney, and lung of Brazilian turtles, and using various primer concentrations and annealing temperatures. This study was conducted at the Laboratory of Biochemistry and Molecular Biology of FMIPA UNJ from June to August of 2010. Through 2% agarose gel electrophoresis, a myoglobin band of 114 pb had been detected in the kidney of normoxic Brazilian turtle. In the lung of the Brazilian turtle, myoglobin was not detected which might be caused by the low myoglobin concentration within the organ.

Keywords
myoglobin, hypoxia tolerant, Brazilian turtle (Trachemysscriptaelegans)

Topic
Biology

Link: https://ifory.id/abstract/vNnqgCabTcV8

Corresponding Author
Anita Christine Sembiring

Institutions
Universitas Prima Indonesia

Abstract
Minimum mileage and maximization of utilities will help the product distribution process to be optimal. Soft drink companies in the city of Medan have problems in distributing products to consumers who are not on time. This is related to the lack of regulation of product distribution channels by the company. Therefore this research was conducted to optimize product distribution routes in order to minimize distribution costs. With the Traveling Salesman Problem (TSP) method, it will combine several closest distribution routes and improve the route sequence. Then the development of sub-routes that are formed from the travel time and utility of transportation equipment used. Formation of sub-routes is still done manually while increasing the order of sub-routes is done by using the Software Quant System (QS) version 3.0. and produce minimum mileage on each sub-route. 6 sub-routes are carried out in one week and are served by 1 transportation car with a capacity of 220 crates. The proposed sub-route is 171 km shorter than the available sub-routes, thus shortening the travel time by 302 minutes to transport the product and save transportation costs of Rp. 68800, - (per week).

Keywords
Distribution route; Traveling Salesman Problem; Utility

Topic
Industry Engineering

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

Corresponding Author
Melati Ferianita FACHRUL

Institutions
a) Department of Environmental Engineering, Faculty of Landscape Architecture and Environmental Technology, Universitas Trisakti, Jakarta, Indonesia

*melati[at]trisakti.ac.id

Abstract
At present, plastic waste is one of the problems that is growing in Indonesia. Plastics take more than 400 years to degrade naturally. One way to degrade plastic waste is by biodegradation. This study aims to degrade Linear Low Density Polyethylene (LLDPE) plastic using mixed culture bacteria Pseudomonas aeruginosa and Brevibacterium sp. The research conducted using plastic cutting 1 x 1 cm in size, as much as 10 gram was put into petri dish containing Nutrient Broth (NB) growth medium. The biodegradation process is carried out for 3 months with the test parameters being temperature (⁰C) and acidity value (pH). Gravimetric and Fourier Transform Infrared (FT-IR) methods were used to determine the weight, morphology, changes in structure and surface of polyethylene. The results showed that mixed bacterial culture has the potential to degrade LLDPE plastic with a percentage reduction of 15% at 35 ⁰C for 5 days. This study proves that mixed culture of bacteria can degrade LLDPE plastic by using it as a carbon source

Keywords
Plastics; Biodegradation; Pseudomonas aeruginosa; Brevibacterium sp

Topic
Environmental Engineering

Link: https://ifory.id/abstract/AV2WaYerP3up

Corresponding Author
Melati Ferianita FACHRUL

Institutions
a) Department of Environmental Engineering, Faculty of Landscape Architecture and Environmental Technology, Universitas Trisakti, Jakarta, Indonesia

* melati[at]trisakti.ac.id

Abstract
This research purpose to remove copper heavy metal (Cu2+) with a biotechnological approach using mixed microalgae Chlorella sorokiniana, Monoraphidium sp. and Scenedesmus obliquus which is bound in Na-Alginate polymer. The effect of contact time and temperature on the biosorption rate was examined to achieve the greatest efficiency in the Cu2+ metal removal process. Bonded biosorbents are made by drying in an oven, grinding, and trapping into polymer alginate to form immobilized microalgae or called beads. The decrease in Cu concentration was analyzed using Atomic Absorption Spectroscopy (AAS). The absorption properties of biosorbents were characterized using Fourrier Transform Infrared (FTIR) and Scaning Electron Microscopy (SEM). Optimization of absorption parameters was carried out in a batch system using a concentration of 20 mg/L Cu wastewater, biosorbent concentration 0.5 g/g, pH 4 with contact time setting (60, 120, 180) minutes and temperature regulation (25, 30, 35)oC. The results showed that maximum biosorption occurred at pH 4, temperature 30oC and contact time 120 minutes with removal efficiency 82%. This research prove that immobilized microalgae is very effective for reducing Cu2+ in wastewater, and immobilized microalgae could act as biosorbents which are effective in further optimization.

Keywords
Biosorption, Copper (Cu2+), Immobilized Microalgae

Topic
Environmental Engineering

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

Corresponding Author
Erfan Handoko

Institutions
1.Dept of Physics. Universitas Negeri Jakarta. Jalan Rawamangun Muka 13220. Jakarta Indonesia
2.Dept. of Physics. Syiah Kuala University. Banda Aceh. Indonesia
3.Dept.of Electrical Engineering. Universitas Mercu Buana. Jalan Meruya Selatan No.1 Jakarta. Indonesia

Abstract
In order to study a new microwave absorbing properties in the X-band frequency range, magnetic materials of BaFe12O19 and BaFe10CoZnO19 were synthesized by ceramic method. Microwave absorbing properties of multi nanolayer absorbers, composed of BaFe12O19 and and BaFe10CoZnO19 with a total thickness of 1 mm, 2 mm and 5 mm, were characterized at room temperature using vector network analyzer (VNA) Rohde‐Schwarz ZVA 67 to measure the reflected signal (S11) and transmitted signal (S21) for 7 – 13 GHz frequencies. Reflection loss (RL) of multi nanolayer magnetic materials were calculated using the transmit line theory. The RL of microwave radiations from multilayer magnetic materials is calculated and strongly depends on thickness of multi nanolayer absorbers and showed an optimal RL.

Keywords
BaFe12O19, BaFe10CoZnO19, reflection loss, multi nanolayer absorb

Topic
Physics

Link: https://ifory.id/abstract/74qVexaTFCDP

Corresponding Author
Siti Divinubun

Institutions
Faculty of Teacher Training and Education
Pattimura Ambon University

Abstract
MARITIME TOURISM SPORTS IN INDONESIAN SITI DIVINUBUN Faculty of Teacher Training and Education Pattimura Ambon University e-mail sitidivin4@gmai.lcom Abstrak; Indonesia has its own tourist attraction compared to other countries in the world because Indonesia is a maritime country with greater sea potential than the land so that natural marine tourism has the potential to develop in Indonesia with plenty of natural wealth from Sabang to Marauke, a marine paradise, marine tourism maritime is much associated with sports activities such as fishing, sailing, paddling diving, like canoeing, snorkeling, water skiing both under water and underwater Nautical sports in tourist areas need to be promoted as recreational sports that make it safe and memorable so that tourists who extend their stay and come many times, as well as supporting players or facilities are prepared with international standards because real citizens contribute significantly to employment starting from accommodation, transportation souvenirs and tour guides with the opportunity to earn regional income Continuous tourism becomes the target of the local government and the other parties needed for the sake of the tourism tourism developer. especially maritime sports activities that may be at high risk need to be upgraded to international standard qualifications, Keywords: Nautical sports, recreational sports, and tourism industries

Keywords
Nautical sports, recreational sports, and tourism industries

Topic
Sport Science and Technology

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

Corresponding Author
Erfan Handoko

Institutions
1.Dept of Physics. Universitas Negeri Jakarta. Jalan Rawamangun Muka 13220. Jakarta Indonesia
2.Dept. of Physics. Syiah Kuala University. Banda Aceh. Indonesia
3Dept.of Electrical Engineering. Universitas Mercu Buana. Jalan Meruya Selatan No.1 Jakarta. Indonesia

Abstract
In order to study a new microwave absorbing properties of single and double layer barium hexaferrite and silika have been investigated in X-band (8.2–12.4 GHz) frequencies. Barium hexaferrite BaFe12O19 was synthesized by ceramic method and Silica SiO2 was prepared from beach sand. Barium hexaferrite and silica with a total thickness of 2 mm, 4 mm, 6 mm, 8 mm and 10 mm, were characterized at room temperature using vector network analyzer (VNA) Rohde‐Schwarz ZVA 67. Reflection loss (RL) of single and double-layer absorbers of barium hexaferrite and silica were calculated using the transmit line theory. The double-layer absorbers exhibit better absorption performances with a stronger microwave absorption and a wider effective absorption bandwidth in comparison with the single-layer absorbers at the same thickness

Keywords
Single and double layer, BaFe12O19, SiO2, reflection loss.

Topic
Physics

Link: https://ifory.id/abstract/wDeFUWAGJ2fm

Corresponding Author
Ratna Dewi Wulaningsih

Institutions
Universitas Negeri Jakarta (UNJ) Biology Education Study Program, Faculty of Mathematics and Natural Sciences, Kampus A, Gedung Hasjim Asjarie Lt. 9. Jl. Rawamangun Muka Jakarta Timur, 13220, Indonesia

Abstract
Testing the validity and reliability of objective questions on PPEP (Perencanaan, Pengelolaan, dan Evaluasi Pembelajaran/Learning Planning, Management, and Evaluation) courses which is carried out at the Biology Education Program FMIPA UNJ demands thorough attention, considering the lecture material in this course is important to provide adequate knowledge for the students as prospective education graduate. Problem Based Learning Model is a cooperative learning model that focuses on student group work in the form of small groups, which consists of four to six people. Students in groups will work together in a positive way and become responsible independently. Data collection using pretest and post-test completed with documentation. The results of this study shows that there is an influence of the problem-based learning model on students skills in testing the validity and reliability of objective questions on PPEP courses.

Keywords
validity, reliability, objective question, problem-based learning model

Topic
Biology

Link: https://ifory.id/abstract/PqmCwW4LH7Gv

Corresponding Author
Kazi Arham Ahmed

Institutions
Department of Nuclear Science and Engineering, Military Institute of Science and Technology.
Mirpur, Dhaka-1216, Bangladesh.

Abstract
Many different types of nuclear power reactors are used for electricity generation. The current nuclear power plant is classified as Generation III or lower. Thermal hydraulics analysis plays an important role in design and safety features of a nuclear reactor. The thermal and hydrodynamic objective of the nuclear power plant design is to safely remove the heat generated in the nuclear fuel without producing fuel temperatures without closely approaching the hydrodynamic critical heat flux under steady-state or transient operating conditions. The present research represents a steady-state thermo-hydraulic analysis of in-house design 50 MWe small modular reactor (SMR). The main objective of this work is to ensure that all important thermal hydraulic parameters uphold margins far below the thermal safety margin limits. In this study, we have calculated fuel centre-line temperature, cladding surface temperature, bulk coolant temperature, power density, average heat flux, the departure from nucleate boiling (DNB) heat flux and DNB ratio. An analytical method has been used to calculate the above mentioned parameters by using a computer program based on C programming language. This method has been validated against the available literature values. It is found from our preliminary analysis that these parameters are within the thermal safety margin limits. Further works are in progress to perform thermal hydraulic analysis by using code such as PARET, RELAP, TRAC etc. to finalize the thermal safety margin limits for our conceptual design of SMR.

Keywords
SMR, Thermal Hydraulics, C program, Heat flux, DNBR

Topic
Physics

Link: https://ifory.id/abstract/xy9dfKgmJYAc

Corresponding Author
Erfan Handoko

Institutions
Dept of Physics. Universitas Negeri Jakarta. Jalan Rawamangun Muka 13220. Jakarta Indonesia

Abstract
In this paper, we report a simple method to prepare different concentrations in molarities Co-Ni doped BaFe10CoNiO19 films on the quartz glass substrates by ultrasonic spray pyrolysis. The Samples were prepared by dissolving iron nitrate (Fe(NO3)3.9H2O), barium nitrate (Ba(NO3) 2) in DI water while stirring at 70-80o C. In these solutions Fe/Ba ratios varied from 12 to 6. Precursor solution was sprayed onto the cleaned quartz plates previously heated to 150 – 200o C, using a sprayer and argon as carrier gas. For crystallization the films were annealed in a furnace at a temperature 1000o C for about 3 h in air. Crystal structure of the film was determined by X-ray diffraction using CuK radiation. The microstructure was examined by a JEOL JSM-5310LV scanning electron microscope. The magnetic properties were measured using a vibrating sample magnetometer. The substitution of Fe3+ ion by Co2+ and Ni2+ has changed magnetic properties of barium hexagonal films.

Keywords
BaFe10CoNiO19 films, ultrasonic spray pyrolysis, barium hexaferrite

Topic
Physics

Link: https://ifory.id/abstract/HFUrXQ7JVBCw

Corresponding Author
Jaelani Sidik

Institutions
a)Departement of Mechanical Engineering, University of Wahidiyah, Faculty of Engineering, Kediri, Indonesia
*jaelanisidik2772[at]gmail.com
b)Educational Construction Building, State University of Jakarta, Indonesia
*arthur[at]unj.ac.id

Abstract
ABSTRAK Wind energy utilization for area with low wind speed potential such as Indonesia remains low due to its low efficiency value. Therefore This research aim to designing and simulation of small wind turbine that can be use in indonesia. We considered for this wind turbin blade are 3. NACA airfoil 4412 was selected and 1.13 of coefficient lift maximum .We designing the blade of wind turbin using software solidworks. The simulation using software Q-blade for the blade radius 1.3 m with various angle of attack 0°, 10°,15°.

Keywords
Wind turbine blade, Airfoil, Q-blade, SolidWorks

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/LVFUqX7MAGkW

Corresponding Author
Dewi Yustiarini

Institutions
(1) UPI and Student at Graduate School of ITB
(2) FTSL, ITB
(3), (4) UPI

Abstract
Good governance is generally characterized by the application of the principles of transparency, participation and accountability as the starting point. This principle is known as the principle of Good Governance which regulates the relationship between government, society and the business sector (private). The initiative to select providers of electronic construction services (the Construction Services Act) is expected to be an answer to transparency and accountability. PP No.16 / 2018 specifically discusses the procurement of goods / services electronically which is managed by LKPP by developing SPSE. LPSE provides accessible information containing package code, package name, HPS package value, etc. The project stage and the contract stage that must be disclosed according to CoST are not all presented by LPSE. This study aims to identify transparency and accountability in the selection of construction service providers based on the legal perspective of construction services. Secondary data collection through legislation, regulations related to the selection of construction service providers. The results of the study are presented in the form of a model of transparency and accountability in the selection of construction service providers.

Keywords
transparancy, accountability, selection, construction

Topic
Civil Engineering

Link: https://ifory.id/abstract/4QPhDtrdfF6n

Corresponding Author
Tonmay Saha

Institutions
a)Military Institute Of Science And Technology
*tonmaysaha002[at]gmail.com

Abstract
Abstract: Due to the technological advancement and continuous power demand increase in the world, nuclear power plays a vital role. The concept of small modular reactor which has power generation capability less than 300MW has gained worldwide attention due to its smaller footprint, co-generation capability, nuclear core design simplicity and non-proliferation characteristics. The aim of this study is to calculate the reactivity worth for SMR by using in-house developed computer program. Two-group neutron diffusion equations have been used to calculate following parameters: material and geometrical buckling, effective multiplication factor, thermal flux, reactor core radius and height, reflector savings, volume of fuel and moderator and nuclear fuel cycle length. C++ computer program has been used to simulate the whole process by iteration technique for cylindrical core. The neutron distribution along the axial and radial direction of nuclear fuel rod has also been analyzed. Boron Carbide has been selected as control rod materials. How the neutronics parameters change with respect to time has been observed. Works are in progress to develop a complete conceptual design of a SMR which will be useful in remote areas.

Keywords
Core Design, Neutronics, Boron carbide , Control rod, Reactivity

Topic
Physics

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

Corresponding Author
Syamsul Hakim

Institutions
Magister Pendidikan IPA Universitas Mataram

Abstract
The study of semiconductor material is a basic experiment. This study aims to identify the effect of SnO2 doped Indium sol-gel color and the effect of the number of slicks on the thin film spread evenly on the glass transparent. The variation of SnO2 doping Indium is 0, 5, 10, 15, 20, and 25%. The technique used in making thin films uses the sol-gel spin coating technique. Spin coating is a technique that is simple, economical, and produces a fairly good thin film. The manufacturing process kind of three stages namely substrate washing, sol-gel making, and thin film growth done respectively. The results showed that sol gel with doping variations had different colors, the higher doping percentage, the clearer sol-gel solution was. The coating results of the thin films have increased, the more coated the surface of the layer looks more evenly with the number of 1, 2, 3, and 4 slicks respectively. The increase doping variations influence to the transparent color of sol-gel be increased. The increase number of slick effect to the thin films more thickness and smooth.

Keywords
Sol-gel, Spin Coating, thin Films, SnO2, Indium

Topic
Material Science

Link: https://ifory.id/abstract/KDZ2rGedQAPn

Corresponding Author
Sri Agung Aryastuti

Institutions
a)Faculty of Medicine and Health Science, Warmadewa University, Jl. Terompong No. 24 Denpasar, Bali-Indonesia
sriagungary[at]gmail.com

Abstract
Metformin, a biguanide oral antidiabetic, is the initial treatment for patients with type 2 diabetes mellitus. Metformin is recommended either as a monotherapy or combination with the other antidiabetic agents. Some studies suggest that metformin treatments have been shown to be associated with improved the high density lipoprotein-cholesterol (HDL-C) level in type 2 diabetes mellitus by interfering with AMP-activated protein kinase (AMPK) pathway. Metformin activate AMPK that stimulates catabolic processes (glycolysis and fatty acid oxidation) and inhibits anabolic pathways (gluconeogenesis and fatty acid synthesis). This is a cross-sectional study aiming to compare HDL level in type 2 diabetic patients using metformin and non-metformin. A total of 138 patients were included in this study with mean age 59.93 (±9.49) years. In the metformin group, the median HDL-C level was 48 mg/dL, while in non-metformin group the median HDL-C level was 45 mg/dL. HDL-level in the metformin group was higher than non-metformin group but it is not statistically significant (p>0.05; Mann Whitney U test). Further studies are needed to investigate another oxidative stress parameter related to AMPK pathway.

Keywords
metformin, HDL, type 2 diabetes mellitus

Topic
Pharmacology

Link: https://ifory.id/abstract/nz6MheANy3bd

Corresponding Author
Ratna Widyati

Institutions
Universitas Negeri Jakarta

Abstract
Classification is a data mining technique for a process of finding a model that explains or distinguishes a concept or class of data. The goal is to be able to estimate the class of an object whose class is unknown. Seeing the importance of education quality that must increase continuously, the study was conducted to evaluate the educational process in the department based on academic historical academic data which is used as input for which new and unknown classes of objects will be obtained. The level of competitiveness in entering a department in higher education is one of the things that becomes an assessment of department accreditation. Thus it is necessary to analyze how many students accepted into a department do not move to other department the following year. The analysis used C4.5 method and in the process used Rapidminer software to make decision trees. The results obtained an accuracy rate of around 80% with confussion matrix.

Keywords
classification, C4.5 method, confussion matrix

Topic
Computer Science

Link: https://ifory.id/abstract/uPZRK34B8FMG

Corresponding Author
Ahmad Kholil

Institutions
Department of Mechanical Engineering Education, Engineering Faculty,
Universitas Negeri Jakarta, Kampus A Jl. Rawamangun Muka, Jakarta, 13220, Indonesia.
Email: ahmadkholil[at]unj.ac.id

Abstract
The study aims to determine the composite characteristics of wood powder, coconut fiber, and green mussel shells that will be used as material for electric motorcycle brake pads. Composites are made with three variations. The first sample (SK30K10CK10) consisted of 30% wood powder, 10% coconut fiber, 10% green clam shell and 50% polyester resin. The second sample (SK20K20CK10) consisted of 20% wood powder, 20% coconut fiber, 10% green clam shell and 50% polyester resin. And the third sample (SK10K30CK10) consists of 10% wood powder, 10% coconut fiber, 10% green clam shell and 50% polyester resin. All samples were tested for hardness and thermal testing. The test results are compared with commercial electric motorcycle brake materials. Based on the test results that the highest level of violence is owned by SK20K20CK10. The results of the specimen samples show that the highest decomposition point is the SK30K10CK10 specimen.

Keywords
composite, coconut fiber, wood powder, green clam shell

Topic
Material Engineering

Link: https://ifory.id/abstract/ftb2Yr8pXmWx

Corresponding Author
Arif Rahman

Institutions
Universitas Negeri Jakarta

Abstract
A Novel catalyst prepared from Indonesia bauxite was used as a catalyst for photo fenton degradation of methyl orange solution. This catalyst is more cheaper than Nafion-based catalyst and more greener than other synthesized catalysts. It is easily prepared from Indonesian natural resources. X-ray diffraction measurements provide structure and mineral compostion of bauxite, while XRF provides information on the composition of Fe by 18% by weight of bauxite mass. The presence of large amounts of Fe in bauxite acts as a catalyst in the decomposition of metyl orange. Testing of photo fenton activity to decompose metyl orange showed that indonesian bauxite had high catalytic activity, was able to decompose 99.4% metyl orange within 40 minutes on irradiation using an 8Watt UVC radiation source

Keywords
catalyst, photo fenton, bauxite

Topic
Chemistry

Link: https://ifory.id/abstract/AzBjJeXZqD7F

Corresponding Author
Arif Rahman

Institutions
1 Universitas Negeri Jakarta
2 Universitas Indonesia
3 Unika Atmajaya Jakarta

Abstract
The synthesis of LTA zeolite from kaolin Bangka using hydrothermal method at low temperatures has been reported. Kaolin was converted into metakaolin by calcinaton process at a temperature of 750 °C for 2 hours then hydrothermal subsequently process at 60 ° C for 5 hours in a NaOH 3M solution. Characterization by using XRD provides information on changes from the crystalline to amorphous phase in the conversion of kaolin to metakaolin to complete and the formation of LTA zeolite after hydrothermal. SEM provides information on morphological changes that are typical for Kaolin, metakaolin and zeolite LTA. Changes in functional groups were also observed in the samples observed using FTIR spectroscopy. From these characterizations, it can be concluded that successfully synthesized LTA zeolite from Kaolin Bangka with high crystallinity using a simple method.

Keywords
Zeolite LTA, Kaolin, metakaolin

Topic
Chemistry

Link: https://ifory.id/abstract/KzUFTv3DHRYy

Corresponding Author
Arif Rahman

Institutions
Universitas Negeri Jakarta

Abstract
The synthesis of a composite series of Kaolin / Zeolite LTA were synthesized out through crystalline phase mixing and heating process at various temperatures. The composite syntesized were characterized by using SEM, XRD and FTIR, TGA and surface area analyzer. XRD analysis showed that crystal structure and amorphous phaseformed due to heating. The increasing of calcination temperature decreases LTA crystallinity significantly in line with increasing of temperature. Meanwhile FTIR spectroscopy provides information on changes in functional groups due to heating. TGA provides information on the amount of mass lost during heating due to the release of functional groups on LTA zeolite. Meanwhile N2 physisorption showed information on decreasing surface area due to increased temperature as a result of decreasing of pore volume due to heating. The calcination temperature of composites changes the composite pore structure

Keywords
composite, Kaolin/Zeolite LTA

Topic
Material Science

Link: https://ifory.id/abstract/yNtuF7h9LM6P

Corresponding Author
Dindin Nasrudin

Institutions
UIN Sunan Gunung Djati Bandung

Abstract
Many students dont like physics because they feel far away from physics. Therefore physics must be made closer to students through contextual physics. This paper wants to describe the physical concepts that exist in geothermal power plants. The method used is descriptive. The results of the study show that there are many physics concepts that can be taught to students through observation and analysis of geothermal power plants such as the concepts of temperature, heat and displacement, electricity, energy and others. These physics concepts can be packaged in physics learning through the development of enrichment materials. It is hoped that there will be an increase in the mastery of concepts and literacy of students towards the surrounding natural resources.

Keywords
electricity, geothermal, literacy

Topic
Physics

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

Corresponding Author
HENDRA PRADIBTA

Institutions
Information Technology Department
State Polytechnic of Malang

Abstract
Acrophobia (altitude phobia) is a type of phobia that makes an individual feel, anxious, tension, and discomfort at height. To overcome this problem, need to escort by a psychiatrist/psychologist to cure the disease and by using a therapeutic approach or behavior method commonly called CBT (Cognitive Behavioral Therapy). This therapy will force sufferers to fight their fears. Current technology called virtual reality was chosen to deal with people with Acrophobia. Through visual reality can provide a 3D-shaped artificial environment that can help sufferers strictly fought the phobias they experienced, but the technology is still not affordable. Therefore, it is necessary to have appropriate technology for therapy needs. By using the Multimedia Development Life Cycle, as a development method, Forward Chaining as a phobia level calculation method, as well as Google Cardboard and Unity 3D is expected to overcome this problem.

Keywords
Acrophobia, Therapy, Virtual Reality

Topic
Computer Science

Link: https://ifory.id/abstract/Dy3AGfqY8mph

Corresponding Author
HENDRA PRADIBTA

Institutions
Information Technology Department
State Polytechnic of Malang

Abstract
Children who are physically hurting others intentionally is a behavior that showed a lack of ability to manage conflict, less control in managing emotions, or lack of ability to convey the desired appropriately. Teaching children to resolve conflicts is a strategy that can be used to create more adaptive behaviors. Children are taught how to resolve conflicts with some of the approaches that suit the environment will grow into adults who are better to cope with emotional problems, especially with other people in the neighborhood. The problem-solving strategy in this research used technological approaches, MATA which is the development of Android-based media where children with aggressive behavior problems can be used MATA as a tool to express emotions through art. Children can freely express their thoughts and feelings visually through color scratches; they can also see the results of their work in three dimensions. The method used in this research is the experimental method. Determination of the research subjects with a purposive sample previously granted WPS Aggression Questionnaire and choose a subject with aggression medium-high categories, the number of subjects in this study were five children each in the control and experimental groups. Results showed that the experimental group experienced a decrease in the level of aggressive behavior than the control group.

Keywords
Aggression, Behaviour, Android

Topic
Computer Science

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

Corresponding Author
HENDRA PRADIBTA

Institutions
Information Technology Department
State Polytechnic of Malang

Abstract
Limited time allocation for Islamic education in primary schools is a halt for the students to understand the lesson. The core of Islamic education is to understand reading and to write letters Hijaiyah. The concept of conventional learning patterns and lack of time made the level of understanding of students is low. To minimize this, learning media are needed that can attract students attention. Especially in children of the present era who are challenged with various types of technology, including mobile phones, televisions, and computers. The role of IT-based media can be a solution in current learning. In the learning process especially for children is learning that gives birth to a pleasant atmosphere. Images and sounds that appear will make children not get bored quickly so that they can stimulate learning in children. In learning that involves the media in the process of learning certainly must consider aspects of early childhood development. Augmented Reality can be utilized in various fields including education. In learning, there are Quantum Learning theories which explain visual, audio, and kinesthetic (VAK) methods. From here Augmented Reality and Quantum Learning theories are interconnected. In this application, there will be Hijaiyah letters that are simulated in the form of Augmented Reality with a sound for instructions on how to pronounce it. This application is expected to help the learning process of Hijaiyah letters both from among students and the general public outside of school, only by scanning the Hijaiyah letters from the Android camera.

Keywords
Interactive Learning, Hijaiyah, Augmented Reality, Android

Topic
Computer Science

Link: https://ifory.id/abstract/NBkVvuX2jRH6

Corresponding Author
Mia Rismalia

Institutions
a) Faculty of Engineering and Technology, Sampoerna University, Jakarta 12780, Indonesia
*farid.triawan[at]sampoernauniversity.ac.id
b) Department of Mechanical Engineering, Politeknik Negeri Jakarta, Depok, Indonesia

Abstract
This paper presents the finite element analysis (FEA) of Miura origami structure under the uniaxial compressive loading condition. The FEA model is developed under elastic-perfectly plastic material. Investigation on the compressive deformation characteristic and elastic modulus with three varied parameters, i.e. angle, thickness, and density of the Miura origami structure is conducted. The Abaqus software is used to conduct the simulation of compression test. The simulation result is then compared with and examined to the experimental data. The results of the analysis can be used for predicting the mechanical behavior of origami-shaped structure such as for designing an impact energy absorber and vibration damper.

Keywords
finite element analysis, Miura origami, uniaxial loading, deformation characteristic, material properties, elastic-perfectly plastic material.

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/rWzE4FbBa2VX

Corresponding Author
HENDRA PRADIBTA

Institutions
Information Technology Department
State Polytechnic of Malang

Abstract
Tourism in Malang City is one sector that contributes significantly to efforts to increase regional income. Efforts such as Strategic City Branding (Beautiful Malang) were carried out to promote tourism in Malang City. Tourism potential in Malang City is very diverse, ranging from natural tourism to culinary tourism. However, the distribution of information about these attractions has not been maximized, because it is still done manually, by looking at the signpost boards which are sometimes unclear, asking questions to the tour guide or by coming directly to Malang Tourist Information Center. This method is not sufficient, because of limited access time and less flexibility for tourists. Lack of information regarding the distribution of tourist attractions can be minimized by using GIS (Geographic Information System) technology. This technology allows tourists to be able to find out where they are at the moment and the closest destinations around them. By utilizing this Geographic Information System, potential tourist attractions can be mapped to be more maximal, so that one can find a place more efficiently and does not take long. To be more attractive, guidance is needed in the form of digital applications and can utilize Augmented Reality (AR) technology. In this case, this technology can be used to display information content in public places. The use of this technology is expected to be something innovative to advance tourism in Malang City.

Keywords
Tourism, Hybrid Technology, Augmented reality, GIS

Topic
Computer Science

Link: https://ifory.id/abstract/AWqxw4vU6PBf

Corresponding Author
Eti Wiraningsih

Institutions
1Department of Mathematics, Faculty of Mathematics and Natural Sciences, State University of Jakarta, DKI-Jakarta, Indonesia
2Department of Mathematics, Faculty of Mathematics and Natural Sciences, University of Padjadjaran, Bandung-West Java, Indonesia


a)Corresponding author: etidwi[at]gmail.com

Abstract
This paper considers deterministic model for transmission dynamics of rabies virus in the free-ranging dog population. The endemic equilibrium is found and its existence depends on the value of the basic reproduction number. The effect of vaccination in susceptible dog population is considered on the model. We then present the effective reproduction number in the present of the vaccination. Further we developed the formula to obtain the optimal vaccination to eliminate the endemic equilibrium, via the Pontryagin Maximum Principle. Some numerical example are presented to show the properties of the optimal control solution.

Keywords
Rabies mathematical model, effective reproduction number, optimal control.

Topic
Mathematics

Link: https://ifory.id/abstract/pu9qaNTUWgtB

Corresponding Author
Ellis Salsabila

Institutions
Universitas Negeri Jakarta

Abstract
This study aims to obtain information regarding the influence of prerequisite concepts understanding and mathematical communication skills on the mathematical proving ability of Mathematics Education Program Students in Faculty of Mathematics and Science, State University of Jakarta (FMIPA UNJ). The method used in this study was survey and correlational techniques. The study population was all students of the Mathematics Education Program FMIPA UNJ in 2018. The study sample was taken with a simple random sampling technique, there was 50 students in total. In this study, the dependent variable was mathematical proving ability and the independent variables were the prerequisite concepts understanding and mathematical communication skills. Study based on the inferential statistical analysis of research data by using multiple regression analysis to test the effect of independent variables on the dependent variables. The results obtained were: 1) the prerequisite concepts understanding had a positive effect on mathematical proving ability, and there was significant correlation by controlling mathematical communication skills; 2) mathematical communication skills had a positive effect on mathematical proving ability, and there was significant correlation by controlling the prerequisite concepts understanding; 3) there was a correlation of simultaneous prerequisite concepts understanding and mathematical communication skills toward mathematical proving ability.

Keywords
mathematical proving ability, prerequisite concepts understanding, mathematical communication skills

Topic
Mathematics

Link: https://ifory.id/abstract/F6U3aujKYWkn