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301	MATHEMATICS AND STATISTICS	ABS-230
Analysis of the Impact of Consumer Price Index and Gross Domestic Savings on Gross Domestic Product Using Vector Error Correction Model (VECM) Rizka Khairunnisa, Mujiati Dwi Kartikasari* Department of Statistics, Universitas Islam Indonesia Jalan Kaliurang Km 14.5 Sleman, Yogyakarta, 55584, Indonesia *mujiatikartikasari[at]uii.ac.id Abstract Gross domestic product, or GDP, is the market value of all final goods and services produced in a country during a given period or year. Although many factors affect GDP, this research focuses on the Consumer Price Index (CPI) and Gross Domestic Savings (TDB) in Indonesia. The main objective of this study is to examine the causal relationship and the impact of CPI and TDB on GDP from 1968 to 2018. This study also focuses on the use of VECM, which is a restricted form of the Vector Autoregressive (VAR) model. This restriction is given as a result of data problems that are not stationary but have a long-term relationship (cointegration). Stationarity and cointegration tests are the first step in anticipating the existence of false regressions so that the data to be analyzed will not provide misleading information. Based on the results of the study, the data was found to be non-stationary, and then first-order differencing was performed on the data. After the data is stationary and it is found that there is cointegration, the assumptions of the VECM analysis are met. However, the VECM analysis found that there was no statistically significant long-term relationship between variables, only a short-term relationship between the CPI variable and GDP, and no short-term relationship from TDB to GDP. Meanwhile, based on the results of the paired causality test, it was found that CPI affects GDP but not vice versa, and it was also found that TDB does not affect GDP but vice versa. As for the results of the analysis of the Impulse Response Function (IRF) and Variance Decomposition (VD), the results show that the CPI tends to have a significant impact on GDP, while TDB does not have a significant effect on increasing the value of GDP. Keywords: GDP, CPI, GDS, Causality, VAR, Vector Error Correction Model (VECM) Share Link | Plain Format | Corresponding Author (Mujiati Dwi Kartikasari)

302	MATHEMATICS AND STATISTICS	ABS-232
Cluster Analysis of Sumatra Island Earthquake Distribution Dian Anggraini (a), Sapto Wahyu Indratno (b,c*), Utriweni Mukhaiyar (b) (a) Doctoral Program of Mathematics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia (b) Statistics Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia (c) University Center of Excellence on Artificial Intelligence for Vision, Natural Language Processing & Big Data Analytics (U-CoE AI-VLB), Institut Teknologi Bandung *saptowi[at]itb.ac.id Abstract There are many sources of earthquakes on the Sumatera Island, such as five mega-trusts, faults, and volcanic activities that extend from Aceh to Lampung. Those make the island of Sumatra vulnerable to earthquakes. The International Seismological Centre (ISC) recorded 9,414 destructive earthquakes in the range of magnitude 4.0 to 9.1 on the Sumatera Island since 1907. When a sudden earthquake occurs and the preparedness in dealing with earthquake disasters are lacking, then the local governments or even the central government have difficulties in managing the earthquake impact. Therefore, the risk classification of locations is needed. Here, the grouping analysis is executed to determine areas with a high-risk vulnerability based on the number of recorded earthquake events. The cluster analysis can be implemented in determining the grouping of earthquake areas through the ^K-means cluster^ model. The results show that the earthquake area on the Sumatera Island is divided into five groups with the order category of vulnerability, with the most occurrences being groups 3 - 2 - 5 - 1 - 4 with values of 2994, 2552, 2488, 760 and 620 earthquake events. While the order based on the average magnitude from largest to smallest is group 1 - 2 - 3 - 5 - 4, the magnitude values are 5.9, 4.88, 4.85, 4.68, and 4.65. The results of this grouping will benefit the government as a primary reference for regional vulnerability data due to earthquakes. So that planning in terms of risk mitigation and earthquake prevention will be optimal, both in terms of policymakers, technical, and financing. Keywords: K-means cluster, Earthquake Share Link | Plain Format | Corresponding Author (Dian Anggraini)

303	MATHEMATICS AND STATISTICS	ABS-233
APPLICATION OF SPATIAL DATA REGRESSION ON FACTORS AFFECTING OPEN UNEMPLOYMENT RATE IN INDONESIA Nabila Aulia Putri Ganessa, Sekti Kartika Dini* Department of Statistics, Faculty of Mathematics and Natural Sciences, Universitas Islam Indonesia *sektidini[at]uii.ac.id Abstract The Open Unemployment Rate (TOUR) is an indication of the working age population which is included in the unemployment group. In 2021 the number of open unemployment in Indonesia will decrease by 0.58% from 2020. The economic activities of a region can be influenced by the economic activities of other adjacent areas. In spatial analysis, eliminating an outlier can result in changes in the composition of the spatial effect on the data. So in this study, discarding outlier data is an inappropriate step. To observe the spatial effect in Indonesia requires 34 provinces to provide the right information at each point. Analyzing spatial data that has outliers, robust regression is used. In robust regression, to obtain the best guess, it is necessary to do iterative calculations. So that the estimated value is obtained which has the smallest standard error parameter. The appropriate method is the Robust M Estimator which is solved using Iteratively Reweighted Least Square (IRLS) with Tukey^s Bisquare function. The results showed that the best model of factor analysis that affects TOUR spatially is the Robust Spatial Autoregressive (RSAR) model. Shown by the coefficient of determination of 98.48% with a Mean Square Error of 0.05231617. The results showed that the best model for analyzing factors that affect TPT spatially is by using the Robust Spatial Error Model (RSEM). Shown by the coefficient of determination of 81.39% with a Mean Square Error of 0.5896. Then it is also supported by the MAPE value of 13.92%. The error value of the TPT variable (&#955-) is 0.5009. This means that the TPT of each province will have an effect of 0.5009 times the average percentage of TPT for each province that is a neighbor. If GRDP, LFPR, HLS and HDI are considered constant and when PPM decreases by 1%, then TPT will decrease by 0.0904%. If PPM, TPAK, HLS, and HDI are considered constant and when GRDP increases by 1%, then TPT will decrease by 0.0274%. If PPM, GRDP, HLS and HDI are considered constant and when LFPR increases by 1%, then TPT will decrease by 0.0625%. If PPM, GRDP, TPAK and HDI are considered constant and when HLS increases by 1 year, then TPT will decrease by 0.6565%. If PPM, GRDP, TPAK and HLS are considered constant and when HDI increases by 1 unit, then TPT will decrease by 0.2153%. Keywords: bisquare tukey, IRLS, outlier, robust regression, The Open Unemployment Rate. Share Link | Plain Format | Corresponding Author (Sekti Kartika Dini)

304	MATHEMATICS AND STATISTICS	ABS-237
Correspondence Study between Types of Motor Vehicle Claims and Customer Locations using Correspondence Analysis: Case Studies on Sharia General Insurance in Indonesia Ahmad Fuad Zainuddin (a), Rr Kurnia Novita Sari (b*), Udjianna Sekteria Pasaribu (b), Yuli Sri Afrianti (a,b) (a) Doctoral Program of Mathematics, Faculty of Mathematics and Natural Science, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia (b) Statistics Research Group, Faculty of Mathematics and Natural Science, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia *Corresponding Author: kurnia[at]math.itb.ac.id Abstract Sharia General Insurance is a type of insurance business that offers non-life protection products with sharia principles. Sharia motor vehicle insurance products is among the most in demand by the public. On the other hand, this product also contributes significantly to claims for Partial Loss (PL) claims, Total Loss Only (TLO) claims, or a combination of both. This study aims to determine the relationship between the customer^s location and the type of motor vehicle claim using the correspondence analysis method. The analysis results are a correspondence map that explains the relationship between the two variables, which illustrates the types of motor vehicle claims are mostly filed in specific city locations. From the contribution achievement data, three major cities have high rates of growth in sharia motor vehicle insurance contributions, namely: Jakarta, Surabaya, and Medan. The study results show that many customers submit Total Loss Only (TLO) claims in the Medan. Meanwhile, in Surabaya, many customers submit Total Loss Only (TLO) and Partial Loss (PL) claims. Furthermore, for Jakarta, many customers submit claims for Total Loss Only (TLO), Partial Loss (PL), and a combination of both. The results of this study can be used as a recommendation for general sharia insurance companies to improve quality and product diversification based on customer location. Keywords: Correspondence Analysis, Motor Vehicle Claims, Location, Sharia General Insurance Share Link | Plain Format | Corresponding Author (Ahmad Fuad Zainuddin)

305	MATHEMATICS AND STATISTICS	ABS-241
ON THE TOTAL EDGE IRREGULARITY STRENGTH OF MODULAR PRODUCT OF P_3 AND P_n Mohamad Fahruli Wahyujati (1,a), M. Salman A. N (2,b), Alfiatri Arif Susilo (2,c). (1) Mathematics Department Universitas Gadjah Mada, Yogyakarta Indonesia. (2) Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesa No. 10 Bandung 40132, Indonesia. a) fahruliwahyujati[at]gmail.com b) Corresponding author: msalman[at]math.itb.ac.id c) alfiatrias[at]students.itb.ac.id Abstract For any simple indirected graph G=(V(G),E(G)), a labeling \alpha: V(G) \cup E(G) \longrightarrow \{1,2,\ldots,k\} is called an edge-irregular total k-labeling of G if every two distinct edges x_1x_2 and y_1y_2 in E(G) their weights are different. The weight of edge is denoted by w_\alpha(x_1x_2), where w_\alpha(x_1x_2)=\alpha(x_1)+\alpha(x_1x_2)+\alpha(x_2). The minimum k for which a graph G has an edge-irregular total k-labeling is called the total edge irregularity strength of G and is denoted by tes(G). In this paper, we determine the total edge-irregular strength of modular product of P_3 and P_n, where P_n is path graph on n vertices. Keywords: Total edge-irregular strength, modular product graph, path Share Link | Plain Format | Corresponding Author (Mohamad Fahruli Wahyujati)

306	MATHEMATICS AND STATISTICS	ABS-242
IMPLEMENTATION OF LATENT DIRICHLET ALLOCATION (LDA) FOR DIVORCE FACTOR TOPIC MODELING (Case Study: Divorce Decision Document at the Yogyakarta Religious Court in 2020) Elen Prihana Putri, Ayundyah Kesumawati Statistics Department of Universitas Islam Indonesia Abstract Marriage is one of the acts of worship that must be properly maintained in order to achieve an eternal bond between a man and a woman as husband and wife with the aim of forming a sakinah, mawaddah, warahmah family. However, often the goals of the marriage cannot be realized properly and run aground in the middle of life, and quarrels often occur until a divorce is created. The phenomenon of divorce cannot be separated from various causal factors, so that it becomes a reason for husbands or wives to file for divorce. The factors that cause divorce are contained in the divorce case judge^s decision document. The aim of this research is to implement topic modelling using the Latent Dirichlet Allocation (LDA) method in the judge^s decision documents so that several topics related to the causes of divorce are obtained. This research focuses on the decision documents of divorce case judges at the Yogyakarta Religious Court in 2020. From the results of the descriptive analysis, most of the divorce cases were contested with a percentage of 78% compared to talak divorce, then the most dominant cause of divorce is disputes and constant fights followed by leaving other parties, the economy, apostasy, madat, domestic violence, and disability. Then the results of the topic modelling analysis using the LDA method obtained a total of 3 topics with a coherence value of 0,45608. Model topic 1 tends to discuss economic problems, model topic 2 tends to discuss domestic disputes and model topic 3 tends to discuss the existence of a third party. Keywords: Divorce Document, Topic Modelling, Latent Dirichlet Allocation, Judge Decision Share Link | Plain Format | Corresponding Author (Ayundyah Kesumawati)

307	MATHEMATICS AND STATISTICS	ABS-244
THE RAINBOW VERTEX CONNECTION NUMBER OF m-SHADOW GRAPH Mohamad Fahruli Wahyujati (1,a), M. Salman A. N (2,b), Alfiatri Arif Susilo (2,c). (1) Mathematics Department Universitas Gadjah Mada, Yogyakarta Indonesia. (2) Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesa No. 10 Bandung 40132, Indonesia. a) fahruliwahyujati[at]gmail.com b) Corresponding author: msalman[at]math.itb.ac.id c) alfiatrias[at]students.itb.ac.id Abstract For any simple connected graph G=(V(G),E(G)) on vertex-coloring is called rainbow vertex-connected graph if any two vertices are connected by a path whose all internal vertices have different color. Such a path is called rainbow vertex-path. The rainbow vertex-connection number, denoted by rvc(G), is the smallest number of colors needed such that G is rainbow vertex-connected. For a graph G on n vertices with V(G)=\{v_1,v_2,\ldots,v_n\}, the m-shadow graph D_m(G) of G is obtained by taking m-copies of G, say G_1, G_2,...,G_m, then adding 2(m-1). |E(G)| new edges by joining each vertex u in G_i to the neighbors of the corresponding vertex u in G_{i+1}, 1\leq i \leq m-1. In this paper, we determine the lower and upper bounds of the rainbow vertex connection number of m-shadow graph and present the exact values of rainbow vertex connection number of particular class of graph, such graph on diameter 2, complete graph and cycle graph. Keywords: Rainbow Coloring, Rainbow Vertex Coloring, Rainbow Vertex Connection Number, m-Shadow Graph Share Link | Plain Format | Corresponding Author (Mohamad Fahruli Wahyujati)

308	MATHEMATICS AND STATISTICS	ABS-247
Robust Path Analysis Development for Indonesian Economic Growth Determinants Fitri Catur Lestari (a*), Anang Kurnia (b), Aji Hamim Wigena (b), Utami Dyah Syafitri (b) a) Politeknik Statistika STIS Jl. Otista 64C 13330 Jakarta, Indonesia *fitricaturlestari[at]stis.ac.id b) Institut Pertanian Bogor Jl. Raya Dramaga Bogor 16680 West Java, Indonesia Abstract Outliers are disturbances in normality assumption of correlation and regression analysis. The classical path analysis that^s formed from them is also suspected to be prone to outliers. The purpose of this research are to develop a robust path analysis from classical one without eliminating outliers and to apply it in real data. The secondary data are collected from BPS Statistics Indonesia for 33 provinces. Eight variables (economic growth [X1], ratio Net Enrollment Rate [NER] of girls to boys in primary and high school education level [X2&X3], percentage ratio of female to male in the labor force [X4], percentage ratio of women to men who manage household [X5], mean years school [X6], urbanization [X7] and unemployment level [X8]) and five models are described in path diagram based on previous research. Robust path analysis development doesn^t need outlier eliminating and the result is better than the classical one. The variety of economic growth is explained 99.1% by model in robust path analyis and only 63.4% in classical one. Based on robust path analysis, X1 is respectively 0.13929, 0.07049, 0.03513 and 0.00186 directly affected by X2, X3, X4 and X5. The highest indirect impact is X7 to X1 which is 0.0199 through X3. Keywords: economic growth, outliers, robust path analysis Share Link | Plain Format | Corresponding Author (Fitri Catur Lestari)

309	MATHEMATICS AND STATISTICS	ABS-249
MODIFIED MULTIPLE DECREMENT TABLE AND ITS CREDIBILITY BASED ON FACTOR CHARACTERISTICS Randi Deautama (1), Rr Kurnia Novita Sari (2*) 1) Faculty of Mathematics and Natural Science, Actuary, Bandung Institute of Technology, Bandung 40132, Indonesia 2*) Statistics Research Group, Faculty of Mathematics and Natural Science, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia *kurnia[at]math.itb.ac.id Abstract The preparation of the Indonesian Mortality Table IV (TMI IV) in 2019 involved 52 life insurance companies in Indonesia in the study period of 2013-2017. From this data, there may be differences in the distribution of insurance agents in each company, namely the different characteristics of the company^s customers. It is feared that this data does not represent every company but only certain companies that have the same agent distribution. In life insurance companies, there is a common type of coverage, namely Natural Death or Personal Accident (NDPA), which means death due to illness or accident- PAD means reimbursement of medical expenses and cancellation of the policy so that coverage ends. Therefore, companies can construct a multi-cause modified life table, the Multiple Decrement (MD) Table. This table is modified into a Modified Multiple Decrement Table (MDT) by adding factors to the causes in the form of regions or others. Factor grouping is necessary to reduce the complexity of the calculation. MDT is obtained from the relationship between MD and the Associated Single Decrement (ASD). The annual exposure method is used to calculate the probability of the cause. Furthermore, extrapolation to the empty cause level and graduation to the coarse cause level Then, credibility theory is used to obtain the credible cause level for the industry. The clustering results of the R1-R9 region and the causes of PAD (3 clusters) and SRD (2 clusters) are different regional groupings. The probability of ASD is greater than the probability of MD. Keywords: associated single decrement, clustering, extrapolation and graduation, crediblity theory, modified multiple decrement Share Link | Plain Format | Corresponding Author (Randi Deautama)

310	PHYSICAL SCIENCES	ABS-277
Physicochemical Analysis of BC/HAP Composites with the Addition of Garcinia mangostana Extract as Antibacterial Agentubmit This Sample Abstract Galih Widyastama (a), Yessie Widya Sari (a*), Mersi Kurniati (a), Wulan Tri Wahyuni (b) (a) Department of Physics, Bogor Agricultural Institute, Dramaga, Bogor 16680, Indonesia *Corresponding author: yessie.sari[at]apps.ipb.ac.id (b) Department of Chemistry, Bogor Agricultural Institute, Dramaga, Bogor 16680, Indonesia Abstract Osteomyelitis is an infection of bone tissue that involves inflammation and bone loss and the spread of bacterial infection to the surrounding soft tissue. Bacterial cellulose (BC) has been used in biotechnology for hard tissue engineering, and soft tissue engineering because of its characteristics, namely biocompatibility, high purity, high crystallinity and high mechanical properties. Hydroxyapatite (HA) is the main constitution of bone because bone contains 65-70% HA in addition to 5-8% water and 20-25% organic matter. Mangosteen fruit peels (Garcinia mangostana Linn.) showed antibacterial effect against gram-positive and gram-negative bacteria. This study aims to make a BC-HA composite with antibacterial properties from mangosteen peel extract by varying the concentration of HA and mangosteen peel extract (GM), and to characterize its mechanical and antibacterial properties. Composites were prepared by immersion method in GM extract. The mechanical properties of the composite were analyzed by Universal Testing Machine (UTM). The antibacterial properties of the composite were tested by measuring the zone of inhibition of bacteria against Staphylococcus aureus. Keywords: Bacterial cellulose, bone implants, hydroxyapatite, mangosteen peels, osteomyelitis Share Link | Plain Format | Corresponding Author (Galih Widyastama)

311	PHYSICAL SCIENCES	ABS-278
Wave-Induced Floating Object Motion for Plastic Object Separation Septian Ulan Dini (a), Avima Haamesha (a), Kemal Firdaus (b), Irfan Dwi Aditya (a), Ikha Magdalena (b), Untung Triadhi (c), Sparisoma Viridi (a*) a) Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung 40132, Indonesia *viridi[at]itb.ac.id b) Department of Mathematics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung 40132, Indonesia c) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung 40132, Indonesia Abstract Plastic objects are materials that are extensively used in everyday life both on an individual and industrial scale. However, some plastic objects end up in the oceans as marine debris that pollutes the oceans. In the last half-century, large concentrations of plastic object have polluted the oceans, with harmful effects on marine wildlife and potentially on human health. To recover plastic objects from the oceans, a new method of separation can be used. In this paper, the physical properties of plastic objects were examined and related to the drift velocities of the object, as well as their effective volume, and drag coefficient, with respect to wave characteristics. The sample contained four variations of a floating object. The wave-induced drift of plastic object was evaluated. Moreover, the effect of the size, shape, and density of the objects was also analyzed. The findings revealed that the density and shape differences between the object resulted in the ratio between the drift velocity of the object and water wave celerity, which were significantly higher in the object with a small density and a sphere form. The results obtained show that the wave-induced drift of floating objects is a potential method for plastics separation. Keywords: Floating object, plastic object, separation, wave Share Link | Plain Format | Corresponding Author (Septian Ulan DIni)

312	PHYSICAL SCIENCES	ABS-24
Existence of Local Classical Solution to the Einstein-Scalar System in Higher Dimensions Mirda Prisma Wijayanto, Fiki Taufik Akbar, Bobby Eka Gunara Theoretical High Energy Physics Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha no. 10 Bandung, Indonesia, 40132 Abstract In this paper we study the existence of local classical solution to the Einstein-scalar equation in higher dimensions. We reduce the problem into a single first-order integro-differential equation. Then, we employ the contraction mapping in the appropriate Banach space. Using Banach fixed theorem, we show that there exists the unique fixed point, which is the solution of the main problem. Finally, for a given initial data, we prove the existence of a local classical solution. Keywords: Einstein-scalar equation, higher dimensions, local existence Share Link | Plain Format | Corresponding Author (Mirda Prisma Wijayanto)

313	PHYSICAL SCIENCES	ABS-282
HEAT TRANSFER ANALYSIS BASED ON TEMPERATURE VARIATION IN HEATING TANK SECTION USING MEDIUM SCALE EXPERIMENTAL FACILITY FARAKHAN NGADI(1), MUHAMMAD GANJAR PUTRA(2), PUTUT HERY SETIAWAN(2), PRICYLIA VALENTINA(2), ADHIKA ENGGAR PAMUNGKAS(2), AGNARINDRA RAHMA LISADAVY(2), ESA PUTRA ARIESTA RAHARJO(3), SONI ABIDIN(4), YENI ANGGRAINI(5), MUHAMAD RAFEL(5), SHENDY AKBAR(5), KATON ADHI(5), ROVIDA CAMALIA(1), NELY TODING(1), MULYA JUARSA(2) 1) Departement of Mechanical Engineering, Faculty of Engineering, Pancasila University, Jl. Lenteng Agung Raya No.56, RT.1/RW.3, Srengseng Sawah, Kec. Jagakarsa, Kota Jakarta Selatan, Daerah Khusus Ibukota Jakarta 12630 2) Reactor Thermal-Fluids System Development Research Group, Research Center for Nuclear Reactor Technology Research Organization for Nuclear Energy (BATAN), National Research and Innovation Agency Building 80, PUSPIPTEK, Tangerang Selatan 15310, Banten 3) Departement of Mechanical and Industrial Engineering, Faculty of Engineering, Gadjah Mada University, Jl. Grafika No.2, Yogyakarta 55281 4) Departement of Mechanical Engineering, Faculty of Engineering, Udayana University, Kampus Bukit, Jl. Raya Kampus Unud Jimbaran, Kec. Kuta Sel., Kabupaten Badung, Bali 80361 5) Departement of Mechanical Engineering, Faculty of Engineering and Sciences, Bogor Ibn Khaldun University, Jl. Sholeh Iskandar, RT.01/RW.10, Kedungbadak, Kec. Tanah Sereal, Kota Bogor, Jawa Barat 16162 Abstract FASSIP-03 NT loop is a medium-scale experimental facility used for research and development of passive cooling systems based on circulating flow phenomena. Meanwhile, the flow rate of natural circulation still has limitations in the absorption of heat in the heating tank and cooling tank for heat release. The purpose of this study was to analyse the heat transfer in the heating tank section based on variations in water temperature. The research method was carried out experimentally by varying the water temperature setting in the heating tank section, namely 60, 70, 80 and 90 degree celcius during steady state. The experimental results show that the magnitude of natural circulation flow is directly proportional to the increase in the water temperature setting in the heating tank section. The minimum flow rate achieved is 0.67 LPM at a setting temperature of 60 degree celcius and the maximum value is 1.47 at a setting temperature of 90 degree celcius. The average heat energy (q) released in the cooling tank section is half of the heat energy received in the heating tank section during steady state. Keywords: FASSIP-03 NT, water cooling tank, heat transfer, passive system, natural circulation Share Link | Plain Format | Corresponding Author (FARAKHAN NGADI ALFARIZIE)

314	PHYSICAL SCIENCES	ABS-284
FARAKHAN NGADI ALFARIZIE FARAKHAN NGADI(1), MUHAMMAD GANJAR PUTRA(2), PUTUT HERY SETIAWAN(2), PRICYLIA VALENTINA(2), ADHIKA ENGGAR PAMUNGKAS(2), AGNARINDRA RAHMA LISADAVY(2), ESA PUTRA ARIESTA RAHARJO(3), SONI ABIDIN(4), YENI ANGGRAINI(5), MUHAMAD RAFEL(5), SHENDY AKBAR(5), KATON ADHI(5), ROVIDA CAMALIA(1), MULYA JUARSA(2) 1) Departement of Mechanical Engineering, Faculty of Engineering, Pancasila University, Jl. Lenteng Agung Raya No.56, RT.1/RW.3, Srengseng Sawah, Kec. Jagakarsa, Kota Jakarta Selatan, Daerah Khusus Ibukota Jakarta 12630 2) Reactor Thermal-Fluids System Development Research Group, Research Center for Nuclear Reactor Technology Research Organization for Nuclear Energy (BATAN), National Research and Innovation Agency Building 80, PUSPIPTEK, Tangerang Selatan 15310, Banten 3) Departement of Mechanical and Industrial Engineering, Faculty of Engineering, Gadjah Mada University, Jl. Grafika No.2, Yogyakarta 55281 4) Departement of Mechanical Engineering, Faculty of Engineering, Udayana University, Kampus Bukit, Jl. Raya Kampus Unud Jimbaran, Kec. Kuta Sel., Kabupaten Badung, Bali 80361 5) Departement of Mechanical Engineering, Faculty of Engineering and Sciences, Bogor Ibn Khaldun University, Jl. Sholeh Iskandar, RT.01/RW.10, Kedungbadak, Kec. Tanah Sereal, Kota Bogor, Jawa Barat 16162 Abstract FASSIP-03 NT loop is a medium-scale experimental facility used for research and development of passive cooling systems based on circulating flow phenomena. Meanwhile, the flow rate of natural circulation still has limitations in the absorption of heat in the heating tank and cooling tank for heat release. The purpose of this study was to analyse the heat transfer in the heating tank section based on variations in water temperature. The research method was carried out experimentally by varying the water temperature setting in the heating tank section, namely 60, 70, 80 and 90 degree celcius during steady state. The experimental results show that the magnitude of natural circulation flow is directly proportional to the increase in the water temperature setting in the heating tank section. The minimum flow rate achieved is 0.67 LPM at a setting temperature of 60 degree celcius Cand the maximum value is 1.47 at a setting temperature of 90 degree celcius. The average heat energy (q) released in the cooling tank section is half of the heat energy received in the heating tank section during steady state. Keywords: FASSIP-03 NT, water cooling tank, heat transfer, passive system, natural circulation Share Link | Plain Format | Corresponding Author (FARAKHAN NGADI ALFARIZIE)

315	PHYSICAL SCIENCES	ABS-29
Energy Estimates of Maxwell-Higgs System on Schwarzchild Black Hole Mulyanto (a), Fiki Taufik Akbar (a), Bobby Eka Gunara (a*) (a) Theoretical High Energy Physics Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia Abstract In this paper, we study the energy estimates of the decoupled Maxwell-Higgs system in the exterior region of Schwarzschild spacetimes. We show that if the field equations verify a Morawetz-type estimate supported around the trapped surface, we can attain the estimates of the Maxwell-Higgs system energy. This result is essential to prove the uniform decay properties in the entire exterior of the Schwarzschild black hole. Keywords: Energy estimates, Maxwell-Higgs, Schwarzchild spacetimes Share Link | Plain Format | Corresponding Author (Mulyanto Mulyanto)

316	PHYSICAL SCIENCES	ABS-286
ANALYTICAL SOLUTION ON NATURAL CIRCULATION PHENOMENON IN COOLER TANK USSA FTS-02 BASED ON TEMPERATURE SETTING VARIATIONS Shendy Akbar Maryadi (a,1), Dwi Yuliaji (a,c,2), Roy Waluyo (a,c,3), Ryan Oktaviandi (a,c), Katon Adhi Prayogo (a), Muhamad Repaldi (a), Muhammad Bintang (a), Syahrul Aminuddin (a), Randy Fahrian (a), Akbar Farhan Maulana (a), Muhamad Andika Apriansyah (a), Mulya Juarsa (a,b,4*) (a) Mechanical Engineering Department, Faculty of Engineering and Sains, Ibn Khaldun Bogor University, Jl. KH. Sholeh Iskandar KM.2, Kedungbadak, Kec. Tanah Sereal, Kota Bogor, Jawa Barat 16162, Indonesia (1)akbarshendy[at]gmail.com (2) dwi.yuliaji[at]uika-bogor.ac.id (3) roy.waluyo[at]gmail.com (b) Reactor Thermal-Fluids System Development Research Group, Research Center for Nuclear Reactor Technology, Research Organization for Nuclear Energy, National Research Agency (BRIN), Gd.80 Kawasan PUSPIPTEK Setu, Tangerang Selatan, Banten 15314, Indonesia (4*) Corresponding author: mulya.juarsa[at]brin.go.id (c) Departement of Mechanical and Industrial Engineering, Faculty of Engineering, Gadjah Mada University, Jl. Grafika No.2, Yogyakarta 55281 Abstract Research on the phenomenon of natural circulation is part of the passive safety system in nuclear reactors due to the nuclear power plant accident at Fukushima Daiichi caused by the failure of the active cooling system (the failure of pump). There is important to investigate the phenomenon of natural circulation to improve the performance of coolant management in passive safety systems. Then, an experimental facility for a passive cooling system was created called the USSA FTS-02 loop which is small in scale. The aim of this research was to understand the phenomenon of natural circulation through analytical solutions in the cooling tank section based on variations in water temperature. The research method was carried out by deriving the balance equation for the buoyancy and retarding forces that apply to the hot and cold arms on the USSA FTS-02 loop. Variation of temperature is determined in the cooling tank, namely 10oC, 15oC, and 20oC, and in the heating tank, namely at 70oC, 80oC and 90oC. The results of the analysis show that the temperature difference between the cooling and heating tank sections determines the natural circulation flow rate, where the greater the temperature difference, the greater the natural circulation flow rate. Keywords: analytical, passive system, natural circulation, USSA FTS-02, cooling tank, temperature difference. Share Link | Plain Format | Corresponding Author (Shendy Akbar Maryadi)

317	PHYSICAL SCIENCES	ABS-288
Synthesis and Characterization of (PVA.LiOH)-Fe3O4 Composite as Magnetic Electrolyte Polymer Membrane Rahmawati Munir*1), Mahardika Prasetia Aji2), Dadan Hamdani1), Sahara Hamas Intifadhah1) Rahmawati Munir1,*), Mahardika Prasetia Aji2), Dadan Hamdani1), Sahara Hamas Intifadhah1) 1)Theoretical and Material Physics, Physics Department, Faculty of Mathematics and Natural Science, Mulawarman University, Jl. Barong Tongkok No.4 kampus Gn Kelua, Samarinda. 75123 2)Physics Department, Faculty of Mathematics and Natural Science, Universitas Negeri Semarang Sekaran Gn. Pati, Semarang. 50229 *)coresponding author: rahmawati[at]fmipa.unmul.ac.id Abstract Currently, research on electrolyte membrane separators for lithium-ion batteries has been developed. The advantages of polymer electrolyte membranes as ionic transport media are strong mechanical properties and a wider operating temperature. Therefore it can be used in a number of electrochemical devices such as fuel cells (fuel cells), sensors, supercapacitors and batteries. The aim of this research is to develop the characteristics of magnetic electrolyte polymer membranes. The research was conducted through two stages, namely synthesis and characterization. In the initial stage, synthesized of polymer electrolyte solution (PVA.LiOH) and dispersed Fe3O4 particles grown in situ in electrolyte polymer solution. The Fe3O4 forming materials used were FeSO4, Fe(NO3)3 and LiOH which were reacted into the polymer electrolyte solution. The concentration of FeSO4 as a carrier ion Fe2+ was increased up to 10 times from the actual mole ratio to obtain stable formation of Fe3O4 magnetic particles in electrolyte polymer solution. At the characterization stage, measurements of electrical conductivity, morphological, elemental content, structure and magnetic properties were carried out. The electrical conductivity of PVA.LiOH polymer electrolyte with Fe3O4 magnetic particles is on the order of 1.81x10-3 S/cm, while without Fe3O4 magnetic particles, the electrical conductivity is on the order of 2.48x10-4 S/cm. The presence of magnetic particles can effectively increase the electrical conductivity of the PVA.LiOH polymer electrolyte and the magnetic properties of Fe3O4 become a new potential in the development of electrolyte polymers. Keywords: Electrical Conductivity- Electrolyte Membrane- Magnetic Particle Share Link | Plain Format | Corresponding Author (Rahmawati Munir)

318	PHYSICAL SCIENCES	ABS-35
Gapped vs Gapless Spin Liquid in the Triangular Lattice Heisenberg Model Muji Juherwin (a*), Ian McCulloch (b) a) Energy System Engineering, Lombok Institute of Technology, Lombok Timur 83661, Indonesia *mujijuherwin[at]gmail.com b) School of Mathematics and Physics, The University of Queensland, Saint Lucia, Queensland 4072, Australia Abstract We study the spin liquid state of the YC6 triangular lattice Heisenberg model (THM). A flux phase is attached to each site and is equivalent to twisted boundary condition on the infinite cylinder system. The numerical investigation was done by utilizing the density matrix renormalization group (DMRG) method implemented via matrix product state (MPS) ansatz. In this study, we have obtained two different groundstates corresponding to the different sector of symmetry. Due to the finite circumference of the cylinder, these two states have slightly different energies. The existence of a finite correlation length throughout the entire twist angle range of the sector with the lower energy indicates that the system is gapped. However, due to the unconventional scaling of the correlation length in the other sector of symmetry, the gap remains inconclusive. Keywords: Spin Liquid, Heisenberg Model, DMRG, Matrix Product State Share Link | Plain Format | Corresponding Author (Muji Juherwin)

319	PHYSICAL SCIENCES	ABS-292
Simulation of Thorium Irradiation In the TRIGA 2000 Reactor Core For 233U Isotope Production Rasito1,2, S. Permana1, P. Ilham Y.1, P. Sukmabuana2, Tri Cahyo2, A. Suherman2 1 Department of Nuclear Engineering, Faculty of Science and Mathematics, Bandung Institute of Technology, Jl. Ganeca 10, Bandung, Indonesia 2Research Organization for Nuclear Energy, National Research and Innovation Agency, Jl. Tamansari 71, Bandung, Indonesia Abstract Simulation of Thorium irradiation has been carried out for the 233U production in the TRIGA 2000 reactor core using MCNPX and ORIGEN codes. Simulations were carried out to determine the number of isotopes of 233U produced and evaluate the irradiation effect of the TRIGA 2000 reactor core on the effective multiplication factor (keff) value. Simulation was done by modeling a dummy rod containing ThO2 placed in positions of G4, E8 and A1. The ThO2 rods are irradiated at 2 MW continuously until the reactor stops. The initial conditions of the model are made with all of the fuel in fresh conditions. The MCNPX calculations of keff parameter of the reactor decreasing from 1.103 to 1.102 for the position of ThO2 at G4, 1.097 for the position of ThO2 at E8, and 1.093 for the position of ThO2 at A1. In the modeling, there is no refueling so that the operating time of the TRIGA reactor with 87 fresh fuels up to 510 days. With the operating time the isotope 233U produced 0.07% for the G4 position, 0.3% for the E8 position, and 0.8% for the A1 position. Keywords: Thorium, simulation, TRIGA, reactor, irradiation Share Link | Plain Format | Corresponding Author (Rasito Tursinah)

320	PHYSICAL SCIENCES	ABS-39
Cosmological Perturbation in Minimal Theory of Mass-Varying Massive Gravity Ahmad Khoirul Falah(1), Andy Octavian Latief(2), Husin Alatas(3), Bobby Eka Gunara(1) (1) Theoretical High Energy Physics Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha no. 10 Bandung, Indonesia, 40132, Indonesia. (2) Physics of Magnetism and Photonics Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha no. 10 Bandung, 40132, Indonesia. (3) Theoretical Physics Division, Department of Physics, IPB University, Jl. Meranti, Kampus IPB Darmaga, Bogor 16680, Indonesia. Abstract It is well known that the unique ghost-free Lorentzian nonlinear massive gravity i.e. de Rham-Gabadadze-Tolley (dRGT) theory suffer from nonlinear instability in standard homogen and isotropic cosmology. An extension of dGRT theory so-called the mass-varying massive gravity (MVMG) be able to rescue from this issue by promoting extra dynamical scalar field with potential function play a role as graviton mass. On the other hand there is growing interest in minimal theory of massive gravity (MTMG) whose modifies number degree of freedom in equals to general relativity but background evolution equals to dRGT. Here, we discuss a new modfied theory of massive gravity by combining two ideas from MVMG and MTMG in higher dimension, we call it minimal theory of mass-varying massive gravity (MTMVMG). In contrast with conventional MVMG where the graviton mass asymptotically approaches zero and become standard quintessence at late-times, we find that in MTMVMG can provide a good description both in massless and massive. In particular, we discuss the MTMVMG under inflationary mechanism where the extra scalar field is identified with the inflaton. Keywords: modified gravity, massive gravity, cosmological model. Share Link | Plain Format | Corresponding Author (Ahmad Khoirul Falah)

321	PHYSICAL SCIENCES	ABS-40
The Graviton Statistic From Minimum Uncertainty Primordial Gravitational Wave Anom Trenggana (a*), Freddy P Zen (a b), Getbogi Hikmawan (a) a) Theoretical Physics Laboratory, THEPI Division, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, West Java, Indonesia *gstanomagung[at]gmail.com b) Indonesian Center for Theoritecal and Mathematical Physics (ICTMP), Jl. Ganesha 10 Bandung 40132, West Java, Indonesia Abstract Primordial gravitational waves could have non-classical properties on graviton statistics if their quantum state is a squeezed coherent state. Uniquely, this state can be generated when the system interacts with a classical scalar field with the initial quantum state in the form of a Bunch Davies vacuum. In this research, we try to expand our understanding of these non-classical properties by involving quantum interactions with systems. The quantum interaction can occur if the initial quantum state is generalized in the form of minimal uncertainty. The result is that the non-classical properties will be more difficult to detect if the number of gravitons in the initial state increases. This can happen because the increasing number of gravitons in the early universe caused the noise to be greater. It means that the initial quantum state in the form of a Bunch Davies vacuum is an initial state with non-classical properties that is most likely to be detected. Keywords: Primordial gravitational waves, Minimal uncertainty, Graviton statistics Share Link | Plain Format | Corresponding Author (I Gusti Agung Anom Trenggana Dharastika)

322	PHYSICAL SCIENCES	ABS-299
EXPERIMENTAL STUDY OF HEAT TRANSFER CHARACTERISTICS BASED ON TEMPERATURE VARIATIONS IN WATER COOLING TANK USING MEDIUM SCALE EXPERIMENTAL FACILITY AGNARINDRA RAHMA LISADAVY (a,1) , MUHAMMAD GANJAR P (a,2), PUTUT HERY SETIAWAN (a,3), ADHIKA ENGGAR PAMUNGKAS (a), PRICYLIA VALENTINA (a), ESA PUTRA ARIESTA (b) FARAKHAN NGADI (c), MULYA JUARSA (a,4*) (a) Reactor Thermal-Fluids System Development Research Group, Research Center for Nuclear Reactor Technology Research Organization for Nuclear Energy (BATAN), National Research and Innovation Agency (BRIN) Building 80, PUSPIPTEK, Tangerang Selatan 15310, Banten (1) Agna001[at]brin.go.id (2) muhammad.ganjar.putra[at]brin.go.id (3) putu003[at]brin.go.id (4*) corresponding author- mulya.juarsa[at]brin.go.id (b) Departement of Mechanical and Industrial Engineering, Faculty of Engineering, Gadjah Mada University, Jl. Grafika No.2, Yogyakarta 55281 (c) Departement of Mechanical Engineering, Faculty of Engineering, Pancasila University, Jl. Lenteng Agung Raya No.56, RT.1/RW.3, Srengseng Sawah, Kec. Jagakarsa, Kota Jakarta Selatan, Daerah Khusus Ibukota Jakarta 12630 Abstract The failure of the active cooling system during the Fukushima-Daiichi reactor accident which caused the melting of the reactor core became a reference for the development of a passive cooling system for future nuclear reactor safety systems. Research on passive cooling systems based on natural circulation on a medium scale is still rarely carried out. Therefore, it is very important to investigate the performance of the components which consist of a heating section and a cooling section, considering that the natural circulation flow rate will depend on the heat transfer process. This study aims to characterize the heat transfer in WCT component at the FASSIP-03 NT loop as a medium scale experimental facility which has a pipes length total of 11.71 meters with a height difference between the heater and cooler of 3.05 meters. The experiment was carried out using temperature variations on the WHT for steady state condition, with variations of 60\circC, 70\circC, and 80\circC in respectively for experimental time of 72000 seconds. The results of this study obtained the highest value of decreasing the temperature of the hot fluid which was 4.65\circC, also obtained the thermal efficiency of the heat sink from variations in WHT temperature, and showed the relationship of overall heat transfer coefficient and heat transfer, obtained successively: 310.235 W/m^2K- 367.57 W/m^2K- 402.86 W/m^2K. Keywords: FASSIP-03 NT, heat transfer, medium scale, natural circulation, passive cooling, medium scale Share Link | Plain Format | Corresponding Author (Agnarindra Rahma Lisadavy)

323	PHYSICAL SCIENCES	ABS-300
EXPERIMENTAL STUDY OF HEAT TRANSFER CHARACTERISTICS BASED ON TEMPERATURE VARIATIONS IN WATER COOLING TANK USING MEDIUM SCALE EXPERIMENTAL FACILITY AGNARINDRA RAHMA LISADAVY (a,1) , MUHAMMAD GANJAR P (a,2), PUTUT HERY SETIAWAN (a,3), ADHIKA ENGGAR PAMUNGKAS (a), PRICYLIA VALENTINA (a), ESA PUTRA ARIESTA (b) FARAKHAN NGADI (c), MULYA JUARSA (a,4*) (a) Reactor Thermal-Fluids System Development Research Group, Research Center for Nuclear Reactor Technology Research Organization for Nuclear Energy (BATAN), National Research and Innovation Agency (BRIN) Building 80, PUSPIPTEK, Tangerang Selatan 15310, Banten (1) Agna001[at]brin.go.id (2) muhammad.ganjar.putra[at]brin.go.id (3) putu003[at]brin.go.id (4*) corresponding author- mulya.juarsa[at]brin.go.id (b) Departement of Mechanical and Industrial Engineering, Faculty of Engineering, Gadjah Mada University, Jl. Grafika No.2, Yogyakarta 55281 (c) Departement of Mechanical Engineering, Faculty of Engineering, Pancasila University, Jl. Lenteng Agung Raya No.56, RT.1/RW.3, Srengseng Sawah, Kec. Jagakarsa, Kota Jakarta Selatan, Daerah Khusus Ibukota Jakarta 12630 Abstract The failure of the active cooling system during the Fukushima-Daiichi reactor accident which caused the melting of the reactor core became a reference for the development of a passive cooling system for future nuclear reactor safety systems. Research on passive cooling systems based on natural circulation on a medium scale is still rarely carried out. Therefore, it is very important to investigate the performance of the components which consist of a heating section and a cooling section, considering that the natural circulation flow rate will depend on the heat transfer process. This study aims to characterize the heat transfer in WCT component at the FASSIP-03 NT loop as a medium scale experimental facility which has a pipes length total of 11.71 meters with a height difference between the heater and cooler of 3.05 meters. The experiment was carried out using temperature variations on the WHT for steady state condition, with variations of 60\circC, 70\circC, and 80\circC in respectively for experimental time of 72000 seconds. The results of this study obtained the highest value of decreasing the temperature of the hot fluid which was 4.65\circC, also obtained the thermal efficiency of the heat sink from variations in WHT temperature, and showed the relationship of overall heat transfer coefficient and heat transfer, obtained successively: 310.235 W/m^2K- 367.57 W/m^2K- 402.86 W/m^2K. Keywords: FASSIP-03 NT, heat transfer, medium scale, natural circulation, passive cooling, medium scale Share Link | Plain Format | Corresponding Author (Agnarindra Rahma Lisadavy)

324	PHYSICAL SCIENCES	ABS-310
Investigation of Biomechanics and Physiology Aspects for The Bench Press Training Niken Ari Safitri, Adrianus Inu Natalisanto, and Rahmawati Munir*) Physics Department Faculty of Mathematics and Natural Science, Mulawarman University, Jl. Barong Tongkok No.4 Gn Kelua Campus, Samarinda 75123 Indonesia Abstract Bench press exercise is a form of powerlifting exercise to train the strength and endurance the muscles of human body. This exercise functions to develop the power of upper body muscles, like the shoulder, arm and chest muscles using an external burden, namely a barbell. We have been investigated the impotrance of biomechanics and Physiology aspects for bench press exercise. This work aims to investigate the effective angle (alpha) needed in lifting weights with the smallest thrust (biomechanics aspects) and determine the value of the minimum energy consumption required in performing the bench press movement (physiology aspects). The research steps were carried out in four stages, namely: firstly, designing biomechanics mathematical equations and determining physiological parameters. Secondly, experiments on people doing bench press movements. Thirdly, processing biomechanics data and physiology data. Lastly, analysis and discussion of biomechanics data and physiology data. Based on the results of the study, by analyzing the thrust to lift the barbell obtained an effective angle that is the angle flank by the upper arm with the lower arm is about 89-114 degree who use the smallest thrust on the grip 0.4 m- 0.5 m- and 0.6 m. The minimum energy consumption in performing bench press movements is obtained by 0.18 kcal/min at a mass of 30 kg- 0.81 kcal/min at a mass of 40 kg- 0.60 kcal/min at a mass of 50 kg- and 0.40 kcal/min at a mass of 60 kg. It can be concluded that the wider the distance between the grips, the greater the thrust required and in bench press sports activities the energy consumption is relatively light so the person observed can still do other day activities. Keywords: Bench Press-Biomechanics-Physiology-Powerlifting Share Link | Plain Format | Corresponding Author (Niken Ari Safitri)

325	PHYSICAL SCIENCES	ABS-57
Non-Gaussianity in The Einstein-Scalar-Gauss-Bonnet Gravity Cosmological Inflation Model. Afiq Agung (a), Getbogi Hikmawan (a), Freddy Permana Zen (a*). a) Theoretical High Energy Physics Group, Department of Physics, Faculty of Mathematics and Natural Science, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia *Corresponding Author: fpzen[at]itb.ac.id, fpzen[at]fi.itb.ac.id, and arsyman[at]gmail.com Abstract An inflationary model can be constrained by non-gaussian statistics as a parameter in the distribution of large scale structure, and in temperature fluctuations of the cosmic microwave background. Data on the cosmic microwave background from Planck (2015) are able to provide up-to-date constraints on the parameters controlling the degree of non-Gaussianity in certain inflationary models, thus supporting or not supporting the model. Setting the non-Gaussianity parameter investigated in this study can be a reference whether or not it is a good parameter in constraining cosmological inflation models. This study attempts to examine the non-Gaussianity of the 3+1 dimensional Einstein-scalar-Gauss-Bonnet gravitational cosmological inflation model starting from random field statistics. The non-Gaussian signature generated by the model is quantified, and the parameters controlling the degree of non-Gaussianity are constrained using data observation of Planck (2015). The method used in investigating non-Gaussianity is the in-in formalism, applied after obtaining the 3-point of \zeta (constant density curvature perturbation) terms of the perturbation expansion to the third order. The 3-point correlation function helps to create a bispectrum used to investigate the non-gaussinity of the inflation model. The results of this study show that the model tested is the slow-roll pressed in the squeezed limit, because it has a dominant local shape function. Keywords: Bispectrum, Einstein-scalar-Gauss-Bonnet, in-in Formalism, Non-Gaussianity. Share Link | Plain Format | Corresponding Author (Afiq Agung)

326	PHYSICAL SCIENCES	ABS-330
Spectroscopy Study and Phonon Side Band Analysis in Europium Doped Borate Glass Eka Sylvianti Rahayu (a), Herman (a*), Lia Yuliantini (e) Nuanthip Wantana (c,d), R Rajaramakrishna (c,d), Nina Siti Aminah (a) Jakrapong Kaewkhao (c,d), Mitra Djamal (a,b) a) Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Bandung 46132, Indonesia b) Physics Study Program, Department of Science, Sumatera Institute of Technology, Lampung 35365, Indonesia c) Center of Excellence in Glass Technology and Materials Science (CEGM), Nakhon Pathom Rajabhat University, Nakhon Pathom 73000, Thailand d) Physics Program, Faculty of Science and Technology, Nakhon Pathom Rajabhat University, Nakhon Pathom 73000 (e) Research Centre for Electronics, National Research and Innovation Agency Republic of Indonesia (BRIN), Bandung 40135, Indonesia Abstract Glass widely known as a good host matrix for rare earth ions due to its high solubility and its optical properties. Among several glass former, borate has a highest phonon energy lies on the range of 1300 - 1500 cm-1 whereas high performance of several emitting device material requires low phonon energy. The phonon energy can reveal by phonon side band analysis from excitation spectra of Europium. In this work, a novel glass consists of B2O3doped Eu2O3 were prepared by melt-quenching technique. We measured the excitation spectra to analyze phonon side band and upconversion emission spectra to observe the effect of adding bismuth. IR spectroscopy was used to get the information about the environment of glass network. The strongest emission perform from Eu3+ doped glass has 614 nm wavelength by 394 nm excitation. Depend on quenching effect concentration analysis optimum concentration of Eu3+ is 3 mol%. The evaluated Judd-Ofelt parameters (&#937-&#955-, &#955-=2, 4, 6) has been used to calculate lasing parameters such as oscillator strength experiment (fexp) and calculation (fcal), transition probability (AR), branching ratio experiment (&#946-exp) and calculation (&#946-cal), and stimulated emission cross section (&#963-). Keywords: Rare earth, Amorphous, Phonon, Europium, Judd-Ofelt Share Link | Plain Format | Corresponding Author (Eka Sylvianti Rahayu)

327	PHYSICAL SCIENCES	ABS-333
NON-DIMENSIONAL NUMBER ANALYSIS BASED ON NATURAL CIRCULATION FLOW CHANGES DURING STEADY-STATE CONDITIONS INSIDE A STRAIGHT-SHAPE HEAT EXCHANGER OF A WATER COOLER TANK IN FASSIP-02 TEST LOOP Esa Putra Ariesta(a,1), Andrea Shevaladze Al Amin (a), Putut Hery Setiawan (b), Deendarlianto (a), Mulya Juarsa (b,2) (a)Department of Mechanical and Industrial Engineering, Faculty of Engineering, Gadjah Mada University, Jl. Grafika No.2, Yogyakarta 55281 1) esa.putra416.ep[at]gmail.com (b)Reactor Thermal-Fluids System Development Research Group, Research Center for Nuclear Reactor Technology Research Organization for Nuclear Energy (BATAN), National Research and Innovation Agency (BRIN), Building 80, PUSPIPTEK, Tangerang Selatan 15310, Banten 2) mulya.juarsa[at]brin.go.id Abstract FASSIP-02 Test Loop is a large-scale experimental facility used to investigate the natural circulation flow rate phenomena in the development of thermal management for the improvement of nuclear reactor passive safety systems. This facility has two main components: a water heater tank, which contains a heater, and a water cooler tank, which contains a straight-shape heat exchanger. The aspect of non-dimensional numbers becomes an integral part of analyzing and studying natural circulation phenomena that occur in water cooler tanks. Thus, the study aimed to analyze non-dimensional numbers such as Reynold and Prandtl during natural circulation flow at a steady state in the straight-shape heat exchanger section with variations in the water temperature setting in the heating section. The research method was carried out experimentally with variations in water temperature settings from 40oC, 50oC, 60oC, 70oC, and 80oC using a total heating power of 20 kW installed in the water heater tank. The analysis results show that the magnitude of the Reynolds number for differences in water temperature settings has an average range from 3120 to 14075, which indicates a change from the transition regime to super turbulence as the water temperature increases in the heating tank. Conversely, the size of the Prandtl number to changes in variations in temperature settings is inversely proportional to the Reynolds number. Whereas the water temperature setting in the heating tank increases from 40oC to 80oC, the Prandtl range decreases from 0.0045 to 0.0025. The important thing is that the Reynolds number for natural circulation flow can reach super turbulence up to 14075 without the circulation pump used in the FASSIP-02 Test Loop Keywords: FASSIP-02 test loop, water cooler tank, straight-shape HE, Reynolds, Prandtl, natural circulation, passive safety Share Link | Plain Format | Corresponding Author (Esa Putra Ariesta Raharjo)

328	PHYSICAL SCIENCES	ABS-80
Light Pollution Measurement and Source Identification Premana W. Premadi (1,2), Vita I. Khikmah (1), Muhammad Yusuf (2), Dhani Herdiwijaya (1), and Sausan K. Haida 1. Astronomy Study Program, FMIPA, Institut Teknologi Bandung 2. Bosscha Observatory, FMIPA, Institut Teknologi Bandung Abstract Despite the claim that light pollution is the easiest to control, it is noticeably worsening worldwide as human population increases. The failure arises from the complication in identifying the main source of the light pollution and therefore in constructing an effective regulation on artificial lighting. We report a preliminary result of our study that aims at a light pollution profile over the years of each region that would guide the construction of a regulation that would systematically prevent light pollution. We conduct two independent studies to identify the various possible source of light pollution. The first one uses demographic data of the greater Bandung area and discovers that residential lights contribute much less than lights from business area, commercial attributes, and streetlights. The second study uses satellite data before, during, and after the Covid-19 epidemic lockdown period over Indonesia. We find that large cities show significant reduction in light pollution as many people worked from home, whereas rural areas show a slight increase or not at all. This result confirms that residential area contributes little to the worsening of light pollution, and that the primary source is pointed at human activities. To be precise: where and how human uses artificial light: commercial and industrial area, high rise offices, and ground transportation (automobiles and streetlight). A follow up study that combines satellite data and on-site ground data using Sky Quality Meter (SQM) is underway with the objective of identifying specific lighting particularly polluting astronomy sky. The correlation between the two types of data could later be used to have better guess of ground data when it is not available. Keywords: Light Pollution Share Link | Plain Format | Corresponding Author (Vita Immamatul Khikmah)

329	PHYSICAL SCIENCES	ABS-83
Effects of Noise in Quantum Entanglement and Coherence Alif KM Akbar Wibowo, Jusak Sali Kosasih Bandung Institute of Technology Abstract In quantum information, quantum entanglement and quantum coherence holds an important role. In preserving the entanglement or the coherence, noise will be taken into account. It happens when a measurement is applied into a quantum system or simply due to the environment surrounding a quantum system. It is important to note that this note will affect the system, namely the entanglement or the coherence. As we know when the system is isolated, the entanglement or coherence would break. However, it is recently known that in a noisy environment, a measurement would instead protect the system. We consider two-level system coupled to an external environemnt. The Hamiltonian of the system is described by the Jaynes-Cummings model coupled to a bosonic bath, H=H_S+H_B+H_I where in the rotating-wave approximation, we have H_S=1/2 &#8463-&#969-(t) &#963-_Z, H_B=&#8463-&#8721-_k^ &#9618-&#12310-&#969-_k b_k^** b_k &#12311-, H_I= &#8463-&#8721-_k^ &#9618-(g_k &#963-_+ b_k+g^* &#963-_- b_k^** ) We notice that the noise &#969-(t) evolves with time. We can further describe it in &#969-(t)=&#969-_0+&#946-(t) with &#946-(t) is the stochastic function representing the noise. To solve the model above, we use a linear non-Markovian stochastic Schrodinger equation which gives the reduced dynamics d/dt &#968-_t=-iH&#968-_t+&#963-_- &#968-_t z_t-&#963-_+ &#8747-_0^t&#9618-&#12310-&#945-(t,s) (&#948-&#968-_t)/(&#948-z_z ) ds&#12311- where &#945-(t,s)=&#8721-_k^ &#9618-&#12310-g_k^2 e^(-i&#969-_k (t-s)) &#12311- is the response function and z_t is Gaussian noise of zero mean and correlations M[z_t^* z_s ]=&#945-(t,s),M[z_t z_s ]=0. Meanwhile, &#946-(t) is characterized by the statistical mean and correlation &#9001-&#946-(t)&#9002-=0,&#9001-&#946-(t)&#946-(s)&#9002-=&#945-_1 (t,s). The master equation is as follows d/dt &#961-=-i[H_0,&#961-]+[a,&#961-O &#773-^** ]+[&#963-_z,&#961-D &#773-^** ]+h.c. where H_0=H[&#946-(t)=0],D &#773-=i&#8747-_0^t&#9618-&#12310-ds &#945-_1 (t,s) &#948-/(&#948-&#946-(s))&#12311-, and O &#773-=i&#8747-_0^t&#9618-&#12310- &#945-_1 (t,s) &#948-/(&#948-&#946-(s)) &#968-_t &#12311-. From this, the mechanism of entanglement/coherence can be studied. Keywords: Noise, Quantum Coherence, Quantum Entanglement, Quantum Information Share Link | Plain Format | Corresponding Author (Alif KM Akbar Wibowo)

330	PHYSICAL SCIENCES	ABS-95
Spreading of Quantum Information in a Locally Driven Quantum Many-Body System Donny Dwiputra (a*), Abas Syahbana (a), Freddy Permana Zen (a,b) (a) Theoretical Physics Lab, Institut Teknologi Bandung, Bandung, Indonesia *donny.dwiputra[at]ymail.com (b) Indonesia Center for Theoretical and Mathematical Physics (ICTMP), Bandung, Indonesia Abstract The information propagation in a non-relativistic quantum system with short-range interactions is bounded by the Lieb-Robison limit. The existence of such an effective ^light-cone^ has profound implications for quantum transport and quantum information processing. We investigate spreading of quantum correlation encoded in an integrable quantum many-body spin system with a periodically driven local impurity. Specifically, we calculate the time evolution of two-point correlations using exact diagonalization to uncover the full quantum behavior. Here we study the correlation dynamics in weak and strong interaction regimes. Our results extend the understanding of quantum systems far from equilibrium and may open perspectives for engineering efficient quantum computations. Keywords: Quantum systems- Periodic Hamiltonian- Entanglement Share Link | Plain Format | Corresponding Author (Donny Dwiputra)

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