Indonesia Conference Directory

Corresponding Author
Merinda Lestari

Institutions
(1) Department of Physics, Universitas Negeri Malang, Jl. Semarang 5, Malang 65145, Indonesia.

Abstract
In the present work, we report a green synthesis of CrFe3O4 nanoparticles using Cucumis sativus peel extract as natural surfactant. The coprecipitation route was explored to produce CrFe2O4 nanoparticles by varying Cucumis sativus composition. The CrFe3O4 nanoparticles were characterized by means of X-ray diffractometer, scanning electron microscopy, and Fourier transform infrared spectroscopy. The results of X-ray diffraction data analysis indicated that the change in the diffraction peak to the higher position was influenced by Cucumis sativus composition. All samples constructed spinel structure in a single phase without any impurity. The scanning electron microscopy images showed that the samples had particles size and morphology in the spherical nanometric size. In general, the particles size and distribution of the particles were contributed by Cucumis sativus peel extract composition as a surfactant. Results of the infra-red data analysis presented that the absorption bands for atomic bonds of O-H at the wavelength of 1379, 1614, and 3479 – 3400 cm-1. C-H bonds appeared in the range of 3000 - 3400 cm-1. Furthermore, Fe-O and Cr-O bonds appeared at the wavelength of 430 – 669 cm-1. Therefore, natural surfactant obtained the from peel extract in this work becomes a new potential candidat to produce magnetic nanoparticles in large scale production.

Keywords
Green synthesis, Fe3O4, Cucumis sativus, natural surfactant, nanoparticle

Topic
Synthesis and Characterization Techniques

Link: https://ifory.id/abstract/CLw2Hyjk3JdN

Corresponding Author
Hassakorn Wattanasarn

Institutions
a) Program of Physics, Faculty of Science and Technology, Sakon Nakhon Rajabhat University, 680 Nittayo Road, Mueang District, Sakon Nakhon, 47000 Thailand
*w_hussakorn[at]snru.ac.th
b) Center of Excellence on Alternative Energy, Research and Development Institution, Sakon Nakhon Rajabhat University, 680 Nittayo Road, Mueang District, Sakon Nakhon, 47000 Thailand

Abstract
A problem of fabricating piezoelectric tape ceramic was poor for density after sintering. Three-step sintering (3SS) techniques were prepared to obtain tape casting ceramic with density and piezoelectric properties better than conventional sintering (CS). Pb0.976K0.012 Bi0.012[(Zr0.53 Ti0.47)0.99 Nb0.01]O3 ceramic was synthesized using tape casting accompanied with sintering techniques. The green tapes were sintered on three steps temperature that is 870, 970, and 1070 °C, respectively, and compared with two steps over a wide sintering temperature range of 870, and 1050 °C, respectively. The optimum density, dielectric properties, polarization electric field loop, piezoelectric coefficient (d33), and mechanical coupling (kp) were attained by three step sintering. The enhanced remanent polarization of 40 μC cm^–1 and d33 value of 220 – 280 pC N^–1. In addition, kp was enhanced of 0.45 be able to obtain for the tape ceramic.

Keywords
Tape ceramic, Piezoelectric, Three-step sintering, Pb0.976K0.012 Bi0.012[(Zr0.53 Ti0.47)0.99 Nb0.01]O3, Polarization

Topic
Metal alloys, ceramics and composite materials

Link: https://ifory.id/abstract/2hJXdk7bjauE

Corresponding Author
Phanawan Whangdee

Institutions
(a) Department of Applied Physics, Faculty of Sciences and Liberal Arts, Rajamangala University of Technology Isan, Nakhon Ratchasima, 30000, Thailand
(b) Advanced Materials and Renewable Energy Research Unit, Faculty of Sciences and Liberal Arts, Rajamangala University of Technology Isan, Nakhon Ratchasima, 30000, Thailand
(c) School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
(d) Research Unit of Advanced Ceramics, Department of Materials Science, Faculty of Science, Chulalongkorn University, Patumwan, Bangkok, 10330, Thailand
(e) Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, Patumwan, Bangkok, 10330, Thailand

Abstract
The anodized films were fabricated by electrochemical anodization of Ti-6Al-4V in an H3PO4/ C2H5OH/NH4F electrolyte. The surface morphology was determined by field-emission scanning electron microscopy (FE-SEM). The surface roughness was characterized by atomic force microscopy (AFM), the chemical species were measured by X-ray photoelectron spectroscopy (XPS) and the hydrophilicity was measured by the contact angle measurement. The results show that the surface morphology, surface roughness chemical species and hydrophilicity of the anodized films change during anodizing process. The two-step anodization using 0.2 mA/cm2 in 1M H3PO4 + 80 % V/V C2H5OH + 1 wt % NH4F could enhance hydrophilicity to the anodized films. The findings indicate that the hydrophilicity was enhanced due to the increased roughness and OH group on the surface of the anodized films.

Keywords
Hydrophilicity, Fluoride, Low current density, Two-step anodization

Topic
Biomaterials and applications

Link: https://ifory.id/abstract/FhUyBAHErp7G

Corresponding Author
Ricky Syandi

Institutions
a) Department of Physics, State University of Medan, Indonesia
Corresponding Author : topartam[at]gmail.com

Abstract
Active subduction off the Indian Ocean coast of Sumatra, Sumatra Subduction Zone, admits the responsibility of triggering earthquake along the boundary region on Sumatra Island. Lobu Tua Village is located near to coast Sumatra that has an underground layer in the form of Alluvium which is considered in the vulverable subsurface layer. The aim of this research is investigating the characteristics of stratification and soil properties in Lobu Tua village by using geoelectrical Data is collected from resistivity meter of ARES-G4 v4.7 SN: 0609135. Schlumberger Geoelectrical method is applied to do groundwater mapping by resistivity value at some path. The first path shows the results of electrode measurements are 6.38 meters of the base layer from the lateral surface with the area of silt soil 155 meters, may lead to land subsidence (liquefaction). The second path shows the groundwater-surface in the sounding layer is 21 meters with the potential landslides. The 2-dimensional cross-sectional model image was performed to display the cross-sectional resistivity of the rock coating method by using the Res2Dinv.

Keywords
Liquefaction, Schlumberger Geoelectrical Method, Lobu Tua Village

Topic
Physics related sciences

Link: https://ifory.id/abstract/k2YDxgcLHVJK

Corresponding Author
NISAKORN SANGWANATEE

Institutions
Informatics Mathematics, Faculty of Science and Technology, Suan Sunandha Rajabhat University, Bangkok 10300, Thailand

Abstract
Sodium aluminium barium phosphate glasses doped with different concentration of Pr2O3 were synthesized by melt quench technique. These glasses were varied concentrations of Pr2O3 at 0, 0.05, 0.10, 0.50, 1.00 and 2.00 mol%. Their physical properties like density () and refractive index (n) were measured at room temperature. Also, optical absorption and photoluminescence spectra of these glasses have been acquired at room temperature. It was found that the intensity were increase with increasing concentration of Pr2O3. UV-Vis and NIR (250-2500 nm) spectra have been measured for all studied glass samples and discussed. The photoluminescence spectra recorded under 445 nm excitation exhibited the emission bands at 528, 598 and 639 nm corresponding to the emission transitions 3P1 → 3H5, 1D2 → 3H4, and 3P0 → 3F2 respectively. The Judd-Ofelt (JO) parameters Ωλ (λ = 2, 4 and 6) have been calculated to explore the bonding environment around the Pr3+ ions. The CIE chromacity color coordinates (x,y) are calculated from the emission spectra which indicates the located in the yellow-orange region. The prepared glasses are potential candidates for laser applications.

Keywords
optical properties, Luminescence

Topic
Optical, luminescence, Electronic Materials and applications

Link: https://ifory.id/abstract/gnXaCzvJ7dA2

Corresponding Author
NARONG SANGWANATEE

Institutions
Applied Physics, Faculty of Science and Technology, Suan Sunandha Rajabhat University, Bangkok 10300, Thailand

Abstract
Nd3+ ion doped lithium aluminium phosphate glasses were synthesized and studied their properties for laser medium application. The density and the refractive index of the glass samples were carried out at the room temperature. The optical and luminescence properties were studied by investigating absorption and NIR emission spectra of the glass samples. The glasses absorbed photons in ultraviolet (UV), visible light (VIS) and near-infrared (NIR) regions are clearly observed from absorption spectra. For the photoluminescence properties, the glass samples showed the strongest emission at 1063 nm when it were excited by 581 nm which assigned to the energy transitions of Nd3+. The three phenomenological Judd-Ofelt parameters (Ω2, Ω4, Ω6) were determined from the spectral intensities of absorption band in order to calculate the radiative transition possibility (AR), stimulated emission cross section (σ(p)) and branching ratio (R) of the 4F3/2  4I9/2, 4I11/2 and 4I13/2 transitions. From the obtained results the conclusions made about the possibility of using these glasses as laser material.

Keywords
luminescence ,aluminium phosphate

Topic
Optical, luminescence, Electronic Materials and applications

Link: https://ifory.id/abstract/b2hf4vwGkgym

Corresponding Author
Esmar Budi

Institutions
1Department of Physics, Faculty of Mathematics and Science,
Universitas Negeri Jakarta, Jl. Rawamangun Muka, Jakarta 13220
2Department of Physcis Education, Faculty of Mathematics and Science,
Universitas Negeri Jakarta, Jl. Rawamangun Muka I, Jakarta 13220

Abstract
In the present study, the effect of temperature during electrodeposition of Ni-TiN/Si3N4 and Ni-TiAlN/Si3N4 composite coatings have been studied. The electrodeposition process was carried out for 15 minutes with a current of 5 mA and three electrodes. Pt wire as the counter electrode, AgCl as the reference electrode and tungsten carbide (WC) as the working electrode. The electrolyte solution used consisted of 0,17 M NiCl2.6H2O, 0,38 M Ni2SO4.6H2O, 6 g/L TiN, 6 g/L AlN, 0,6 g/L Si3N4, 40 g/L H3BO3 and 0,6 g/L Sodium Dodecyl Sulfate (SDS). In this stydy, the temperature variations used were 35°C, 40°C and 45°C. The samples were characterized by using SEM, EDS, XRD and hardness test. The results and discussion were presented.

Keywords
Ni-TiAlN/Si3N4,Ni-TiAlN/Si3N4 composite layer, electrodeposition, surface morphology,temperature.

Topic
Metal alloys, ceramics and composite materials

Link: https://ifory.id/abstract/6Zc93hJP8bef

Corresponding Author
Irsyad Nashirul Haq

Institutions
(1,2)Graduate Student at Department of Engineering Physics. Institut Teknologi Bandung
(1)ariwibawak[at]gmail.com (2)handre.kerthautama[at]gmail.com

(3,4,5) Department of Engineering Physics. Institut Teknologi Bandung
(3)edi[at]tf.itb.ac.id,
(4)irsyad[at]tf.itb.ac.id
(5)supri[at]tf.itb.ac.id,

(4) National Center for Sustainable Transportation Technology. Bandung, Indonesia

Abstract
The lithium-ion batteries (LIB) frequently being used in the electric vehicle due to high energy density, high power density, and fairly long-life cycles. In this paper, LIB applied to electric trike which becoming very popular recently. Performance and life cycles of LIB sensitive to temperature, so it is necessary to maintain the temperature condition in the range of -20oC to 40oC. Temperature significantly affects the performance of the LIB battery and also limits the applications of the LIB battery. To be able to maintain the temperature of LIB at optimum temperature, the temperature distribution inside the LIB pack should be investigated first. This paper study the temperature distribution of the LIB pack used in the electric trike. Pack geometry, as well as the surrounding condition, first build in Solidworks. The geometry model then imported to Comsol Multiphysics to study phenomena of mass transport and heat transfer within the LIB pack and surrounding area. The main objective of this study is to lay the foundation to design the battery thermal management system (BTMS) in the LIB pack for the electric trike.

Keywords
lithium-ion batteries, thermal characteristic, temperature distribution, electric trike

Topic
Cooling System for Electric Vehicle

Link: https://ifory.id/abstract/RVK97qjQYprN

Corresponding Author
Meilisa Dewi Kharisma

Institutions
a) Engineering Physics, Bandung Institute of Technology
Ganesha 10, Bandung 40132, Indonesia
*meilisadewikharisma[at]students.itb.ac.id
b) Technology Development, PT LEN
Soekarno-Hatta 442, Bandung 40254, Indonesia

Abstract
The equivalent circuit of lithium-ion battery cell has been presented in some research to model a state of charge (SOC) and battery cell electrical behaviour. The equivalent circuit was built from an open circuit voltage, two resistor-capasitor parallel networks, and a series internal resistance. In several application, some battery cells are connected in series-parallel configuration to produce a battery pack with specified voltage and capacity. In this paper, a modified battery cell model is used to represent the battery pack dynamics. The battery pack is assumed to be balanced on both series and parallel side. The model then validated by comparing simulation results between battery pack model and battery cells that connected in series-parallel configuration. Simulation results shows small difference between the two models.

Keywords
Lithium-ion battery, Battery pack model, Battery cell model, State of charge, Parallel-Seri configuration

Topic
Battery Technology and Management System

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

Corresponding Author
Irsyad Nashirul Haq

Institutions
(1) Graduate Student at Department of Engineering Physics. Institut Teknologi Bandung
(1)iman95[at]gmail.com

(2,3,4) Department of Engineering Physics. Institut Teknologi Bandung
(2)irsyad[at]tf.itb.ac.id, (3)edi[at]tf.itb.ac.id, (3)augie[at]tf.itb.ac.id

(2) National Center for Sustainable Transportation Technology. Bandung, Indonesia

Abstract
Electric Vehicle (EV) Batteries must have high reliability to produce durable and sustainable electrical energy. Reliable electric batteries will certainly have high economic value and efficiency. Reliability can be obtained if the system and its supporting are monitored using an integrated and independent system for further analysis and observation. Battery Management System (BMS) is integrated parts of Electric Vehicle, Hybrid Electric Vehicle (HEV), or solar applications e.g. solar power plant. Its functions are to integrate many things such as voltage sampling from cell battery, cells balancing, determine State of Charge (SOC), estimate State of Health (SOH), and predict Remaining Useful Life (RUL). The key technology needed for condition-based maintenance is Prognostic and Health Management. It is a new engineering approach that allows an assessment of the systems health when the system is operating. It combines various scientific disciplines, namely: sensing technology, modern statistics, machine learning, physics of failure, and reliability engineering. It will be combined with Big Data analysis. Big data uses existing technology and contemporary architecture that is designed to efficiently take advantage of the many and varied data. Big data analytics refers to the method of analyzing huge volumes of data, high velocity of data, variety different forms of data, and veracity of uncertainty of data. The main focus in this research is the development of an integrated observation system and the ability to make error predictions. This system consists of error detection, error diagnosis, and integrated prognosis. This research is to implement Big Data analytics Platform to evaluate the reliability level of electric vehicle Battery Management System.

Keywords
Electric Vehicle, Remaining Useful Life, Big Data Analytics, Battery Management System

Topic
Battery Technology and Management System

Link: https://ifory.id/abstract/AGUe6DRTrJ3y

Corresponding Author
Irsyad Nashirul Haq

Institutions
(1)Graduate Students, Department of Engineering Physics, Institut Teknologi Bandung
(2,3,4) Department of Engineering Physics,
Institut Teknologi Bandung
(2) National Center for Sustainable Transportation Technology, Bandung, Indonesia

(1)fadhlin_nugraha[at]yahoo.com,
(2)irsyad[at]tf.itb.ac.id
(3)edi[at]tf.itb.ac.id,
(4)nugroho[at]tf.itb.ac.id

Abstract
In this study, an investigation of thermal characteristics was carried out at two stages namely, the experimental stage and the simulation and modeling stage. In the experimental stage, the battery consists of 1 cell with a capacity of 14Ah. At the experimental stage, the battery under investigation works at the discharge currents C1, C2, and C4, with natural convection studies in insulation and non-insulation systems. The assumptions used in this study are the battery used have experienced more than 10 cycles, the heat radiation from the battery is ignored, the parameters and thermal constants are considered constant. The ambient temperature range for operation is at 24oC – 28,5oC. Experimental results show that the battery system under insulation conditions has more stable thermal characteristics compared to non-insulation systems. As well as the results of the simulation stage 1 battery cell under conditions of insulation and non-insulation. In addition, estiomation were also made for the 10 battery insulation system. The temperature rise characteristic shows an exponential graph on all simulations performed. By evaluating the measurement values in the experimental and simulation stages, the results of the non-insulation conditions show an error for the C1 discharging current of 1,77%, C2 of 1,97%, and C4 of 0,38%. The results of insulation conditions show an error for the C1 emptying current of 1,10%, C2 of 0,53%, and C4 of 0,05%.

Keywords
Thermal Characteristics Estimation, Battery Module, Finite Element Method, Temperature Distribution

Topic
Cooling System for Electric Vehicle

Link: https://ifory.id/abstract/8tyQhfd7MEac

Corresponding Author
Irsyad Nashirul Haq

Institutions
(1,2,3,4,5) Department of Engineering Physics
Institut Teknologi Bandung
Bandung, Indonesia
(2) National Center for Sustainable Transportation Technology. Bandung, Indonesia

(1)edi[at]tf.itb.ac.id
(2)irsyad[at]tf.itb.ac.id
(3)yuliast[at]tf.itb.ac.id
(4)ghifarfahran[at]gmail.com,
(5)fahri.nabhan[at]gmail.com

Abstract
As of right now the development of electric vehicles is very rapid. This is supported by the transition from vehicles with fuel oil to electricity, the development of increasingly widespread electric vehicles, and the production of increasingly cheap batteries. Generally the battery used is a lithium-ion battery. But over time, the quality of the lithium-ion battery will be degraded so that the battery quality is not as early as its use. The causes of battery degradation are unbalanced cell in the battery pack. To overcome this problem, a reliable battery management system (BMS) is needed. In the design of the BMS to prevent the imbalance of the proposed battery voltage using the active method from cell to cell battery. BMS uses a microprocessor to process battery data, a microcontroller to control battery connecting switches, and a DC-DC converter circuit as well as a switched capacitor (SC). From the proposed design BMS is able to monitor the voltage of each battery directly, able to store automatic data on the database in the microprocessor, able to set the switch connected between the highest voltage battery to the lowest voltage battery, able to balance the battery with a voltage difference between batteries up to 0.0032 V, able to increase the capacity of the battery pack compared to the system without a balancing system up to 130 mAh , and the balancing system can increase the energy of the battery pack compared to the system without a balancing system to 10.363 Wh or 6.88%

Keywords
Lithium ion battery, active cell balancing, battery management system, electric vehicle

Topic
Battery Technology and Management System

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

Corresponding Author
Atta Putra Harjanto

Institutions
Faculty of Economics, Universitas Negeri Semarang, Semarang, Indonesia
Gedung L Kampus Sekaran, Gunungpati
*085727195857/attaputraharjanto[at]gmail.com

Abstract
This paper aims to examine the effect of PP23/2018 implementation towards tax compliance of Small Medium Enterprise (SME) in Semarang City. Variable PP 23 Implementation were proxied by tax understanding and sanctions. The paper opted for a quantitative study by using primary data. The data were collected by using questionnaire and analysed using multiple regression. SPSS software was used to analyse the data while sample was chosen by random sampling technique. The population of this study is Small Medium Enterprise in Semarang, especially Course and Training Institution. Samples amounted to 155 are valid and reliable to be analysed further. The paper shows that the implementation of PP23/2018 in Indonesia affects tax compliance of SMEs. It suggests that understanding of new regulation and sanction positively affect tax compliance among SMEs. Because of the chosen research approach, the research result is specific and may lack of generalizability. Therefore, researchers are encouraged to test the proposed hypothesis to other objects. The paper includes implications for the tax regulator in implementing new regulation affected SMEs in the future.

Keywords
PP 23/2018, tax understanding, tax compliance, tax sanction, SME

Topic
Accounting

Link: https://ifory.id/abstract/BZ79muGaMXfg

Corresponding Author
Shafinar Ismail

Institutions
Faculty of Business and Management, Universiti Teknologi MARA Cawangan Melaka, 110 Off Jalan Hang Tuah, 75300 Melaka, Malaysia

Abstract
The highlighted issue in this research is low intention to repay loan among households. Low loan repayment intention can lead to default payment, delinquency as well as bankruptcy. This research is to investigate the impact of financial attitude and financial literacy on loan repayment intention. The total of 257 respondents in this research is households in Melaka. The sampling chosen in this research is purposive sampling. By using the Statistical Package for the Social Science (SPSS) version 22, all data gathered were analysed. In order to obtain the result, frequency distribution, descriptive analysis, reliability analysis and Pearson correlation analysis were conducted in the analysis part. This research found that financial attitude has a significant impact towards loan repayment intention. These finding could contribute to the body of knowledge by identifying determinants of loan repayment intention among households. Financial attitude is identified as a construct that guides future behaviour or the cause of the intention that leads to repay loan.

Keywords
financial attitude, financial literacy, loan repayment intention

Topic
Management

Link: https://ifory.id/abstract/7en4xrzpkV9f

Corresponding Author
Dyah Maya Nihayah

Institutions
Universitas Negeri Semarang

Abstract
The tourism industry is one of the economic sectors that can cause multiplier effects for the regional economic growth. Kota Lama is a cultural heritage that must be sought for preservation. Good planning is needed to develop it as a tourist destination. The purpose of this study is to find out the tourist preferences that are very important as an evaluation to find out the market demand for heritage tourism. This research is an exploratory study with mix methods. The data used are primary data obtained from interviews and questionnaires to tourists. Data was taken by purposive random sampling method and analyzed by quantitative descriptive method. There are five aspects which a region can become tourist destinations, that are aspects of attractions, accessibility, facilities and promotions and information. The result shown that Kota Lama as a heritage tourism has fulfilled all aspects as heritage destinations. The tourism-s perception will be able to support its development policy. Coordination with the community and tourism stakeholders is needed because tourist satisfaction is a determinant of the success and sustainability of heritage tourism

Keywords
preference, tourist, development, heritage tourism

Topic
Sustainable development

Link: https://ifory.id/abstract/PHFvKCrmxqY7

Corresponding Author
Mohammad Isa Pramana Koesoemadinata

Institutions
Visual Communication Design Study Program, School of Creative Industries, Telkom University, Bandung, Indonesia

Abstract
Indonesia is a country with a vast cultural diversity as well as a high historical value, many historical sites found in various regions in Indonesia including Magelang Regency, Central Java. There is the largest temple called Borobudur, this temple is located in Borobudur, Magelang Regency, Central Java. Besides Borobudur, there are several temples in various locations in Magelang Regency, these temples are not yet exposed to the world, namely Lumbung, Asu, Pendem, Gunung Sari, Gunung Wukir, Losari, and any other temples. These temples become the cultural heritage with its own beauty and high historical values with different functions and objectives from each other. The existence of these temples need to be pre-served because of its use for science, education, religion and any other aspects. Government Tourism Office have already made an effort in the publication through websites, brochures, and magazines. After analyzing the publication, there are shortcomings in the delivery of the publication through the media. Therefore, to provide historical information and docu-mentation of the temples in Magelang as historical evidence there is a need for putting more effort. The survey was done by the author through questionnaire and interview, the author concludes to use photobook as media to convey the infor-mation about these temples and to use photos to document these temples.

Keywords
Photobook, Ancient Temples, Magelang Regency

Topic
Design

Link: https://ifory.id/abstract/yYvFdN2AVUhp

Corresponding Author
Rizka Rachmawati

Institutions
Telkom University

Abstract
The development of early childhood education facilities in the form of a playroom at the school of Early Childhood Education (PAUD) in order to provide the best facilities for the children-s growth is now increasing. The need for playroom facilities is considered important considering the necessary to improve the quality of child development at an early age. This requires an optimal child comfort in the playroom, which can be supported by good environmental management. One of the most important factors is through the management of interior materials finishing, where there will be interactions between children, caregivers, and the surrounding environment. Good interior finishing can create a safe, comfortable, and appropriate playing and learning situations to support early childhood growth. Nowadays there are a lot of playrooms, especially those in the Early Childhood Education school that have not adjusted to good standards in term of interior design, so there need to be a research regarding interior materials finishing, which can affect and influence physical development and thinking patterns of the early childhood. The approach of this research carried out with qualitative meth-ods, began by observing the reality in the field about the playground conditions in several PAUD schools, then explaining things that are going on and thinking in ways that move towards concepts and theoretical propositions (hypotheses).

Keywords
interior finishing, playroom, children spaces

Topic
Design

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

Corresponding Author
muhammad hidayattuloh

Institutions
Telkom University

Abstract
As a state-owned enterprise, PT Kereta Api is a company that is responsible for providing land transportation services in Indonesia. Revamping PT Kereta Api in the past few years, made PT Kereta Api to promote through digital media, one of which was by creating Instagram social media accounts. Through the istagram account @ KAI121 which is the official account of PT Kereta Api Indonesia, various content regarding promotions, discounts, ticket booking information, train schedules, etc., are broadcast and receive responses from the folowers. According to David Aaker, digital media - one of which is social media - has the power as a brand building tool for organizations that want to build or enhance their brands. In this study, the author will examine digital brand building on the official account of PT Kereta Api Indonesia (@ KAI121), especially on programs that support offer, based on the theory of David Aaker. This research uses qualitative methods supported by the theory of branding, advertising, and visual communication design.

Keywords
PT Kereta Api Indonesia, Instagram, Brand, Advertising, Visual Communication Design.

Topic
Design

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

Corresponding Author
Haris Djoko Nugroho

Institutions
Universitas Negeri Jakarta

Abstract
This study aims to evaluate the Hydro-Oceanographic Officer Specialization Education Program, at the Indonesian Navys Hydro-Oceanographic Education Center. The method used was the evaluation study method with Kirkpatricks model. The results of the study show; (1) Reaction, Dikspespa Hidros program as a Dikbangspes Hidros program that refers to the International Hydrographic Organization (IHO) Curriculum has been recognized as "B" Category Hydrographic Surveyor Education even though it does not yet have educators from abroad, (2). Learning, there are some aspects of the assessment including the improvement of knowledge, skills and attitudes which all have good value, (3). Behavior, divided into two parts, namely work ability and alumni have work motivation so that they are able to apply knowledge well into work, physical abilities applied in carrying out tasks and emotional abilities show good work attitudes, and (4) result, alumni have satisfactory performance such as aspects of the quality of work, quantity of work, cooperation and work involvement are all classified as good. Dikspespa Hidros graduates generally can directly participate in Operation Dikspespa Hidros while alumni from non-hydros (Armada, Lantamal and Lanal) still need assistance in working.

Keywords
Evaluation, Program, Specialization, Hydro Oceanography

Topic
Organizational Behavior, Leadership and Human Resources Management

Link: https://ifory.id/abstract/3BPqVAYJ9Gjf

Corresponding Author
Vanessa Gaffar

Institutions
Universitas Pendidikan Indonesia, Universitas Pendidikan Indonesia, Coventry University

a) Management Study Program, Universitas Pendidikan Indonesia
Jl. Dr. Setiabudhi No. 229, Bandung 40154, Indonesia
*vanessa[at]upi.edu
b) Entrepreneurship Study Program, Universitas Pendidikan Indonesia
Jl. Dadaha Nomor 18 Kota Tasikmalaya, Tawang Kota Tasikmalaya 46115, Indonesia
c) Centre for Business in Society, Coventry University
Jaguar Building, Gosford St, Coventry, CV1 5DL, United Kingdom

Abstract
This study aimed to analyze the implementation of Customer Relationship Management in Small Medium Enterprises in West Java Province, Indonesia. This research is a qualitative research using in-depth interview to collect data. There were 5 small enterprises participating in this study. All of them came from different fields of business, namely fashion, travel, food, sneakers and photography. Interview guidelines was set up consisting customer relationship management program that has been done in the company. This was categorized into three programs: continuity marketing, one to one marketing, and partnering program. The study showed that participants basically has implemented CRM in their businesses. They have known the basic function of CRM although they aren-t fully aware of CRM terminology. It is important for those enterprises to know and understand more of what CRM is and the benefit of implementing it so that they can perform better and create customer loyalty.

Keywords
Customer Relationship Management. Small Medium Enterprise, Loyalty

Topic
Marketing Management

Link: https://ifory.id/abstract/Yx36XqFpwgeG

Corresponding Author
Ika Suhartanti Darmo

Institutions
Institut Teknologi dan Bisnis Kalbis (KALBIS Institute)
Universitas pendidikan Indonesia

Abstract
Creative economy increases a lot of entrepreneurial potential throughout the territory of Indonesia; especially in the culinary field. Despite having a large market, most local culinary SMEs in Bandung, West Java unable to develop their business because limitation of their internal resources and innovation to manage a good business. This quantitative research aims to supports SMEs culinary practitioners in Bandung to improve their businesss dynamic capabilities in countering a modern business competition by improving their performance of innovation and entrepreneurial capabilities. A total of 143 respondents were selected from the purposive random sampling method out of 10 commercially busy culinary businesses in the city of Bandung. The results of this study indicate that partially and simultaneously; the performance of innovation and entrepreneurial capabilities have a relatively large influence on the dynamic ability of the culinary business of business people in the city of Bandung, West Java. With the existence of high dynamic capability, culinary business people will never run out of creative ideas and productive new innovations; so that all activities carried out will have a positive economic and social impact on the surrounding community.

Keywords
entrepreneurship capability, innovation performance, dynamic capability

Topic
Strategic Management, Entrepreneurship and Contemporary Issues

Link: https://ifory.id/abstract/qTHBe8hX7upt

Corresponding Author
SUMIYATI SUMIYATI

Institutions
Universitas Pendidikan Indonesia

Abstract
The present study aims to find out the influence of workload through job stress and the influence of job stress through employee performance. The object of the study is used as an analysis unit employee at Clinic X. This study is using a verificative method which used explanatory survey with 63 respondents as samples. The result of the study found that the influence of workload through job stress is in a strong category, which means that job stress has an effect on employees performance in Clinic X which is in a strong category. However, the pre-sent study has found out that if the workload is appropriate, then employees job stress will decrease. In addi-tion, if job stress is increased, the employee performance in Clinic X will increase.

Keywords
Workload, Job stress, Job performance, Clinic

Topic
Organizational Behavior, Leadership and Human Resources Management

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

Corresponding Author
Guntarti Tatik Mulyati

Institutions
ugm

Abstract
This paper studies important factors that influence the physical workload of rice harvesters. Rice harvesting in Java, Indonesia, uses traditional and semi-mechanical harvests that require significant physical energy. Ergonomic Risk Factors (ERFs) are skeletal, muscle, and peripheral nerve disorders called Musculoskeletal Disorders (MSDs). Surveys and observations in Bantul Regency, Yogyakarta Province, many independent variables and one dependent variable is Cardiovascular Load (CVL), in multiple linear regression equations. Respondents were worker who harvested manual and semi-mechanical methods. Age and ambient temperature variables correlate strongly with CVL manual worker. CVL semi-mechanical harvest worker are strongly correlated with age and heart rate. By F test, manual worker workload, 94.5% is significantly influenced by variables of age, smoking habits, heart rate and ambient temperature. CVL semi-mechanical workers are only 91.1%. To avoid high CVL, the age factor of workers is a major consideration. MSDs occur in the upper and lower back for manual workers, semi-mechanical workers on the lower back and both hands. From the assessment of work posture in 4 elements of harvesting, transporting was the activity with the worst posture. Ergonomic interventions are needed to reduce ergonomic risks in transportation.

Keywords
ergonomics risk factor, msds, cvl

Topic
Other Agricultural and biosystems topic

Link: https://ifory.id/abstract/NZx9fgtRYrLX

Corresponding Author
FX Delova Christama

Institutions
Universitas Pembangunan Nasional "Veteran" Yogyakarta

Abstract
The research area is located nearby Batutegi Dam in Batutegi Village, Air Naningan District, Tanggamus Regency, Lampung. This area is predominantly occupied by metamorphic rock, namely mica schist, which is part of Paleozoic Gunungkasih Complex. The geological fieldwork which has been conducted reveals the existence of mineralization potential. Altered rocks found in this area are an evidence of past hydrothermal activity during the orogeny tectonic event of Sumatra Island formation which might have deposited some ore minerals. The altered rocks have experienced argillic alteration type with the presence of illite and secondary quartz. This kind of rocks is mostly associated with iron oxide druzy quartz veins. The structures controlling this area are mainly oriented in NW - SE direction.

Keywords
gold mineralization, metamorphic rock, Sekampung River

Topic
Geology

Link: https://ifory.id/abstract/FVnqxXJhw9tj

Corresponding Author
Sumadi Sumadi

Institutions
a) Public Sector Accounting Program Study, Politeknik Negeri Jember
Jl. Mastrip PO BOX 164 Jember, East Java, Indonesia
*) madidhea57[at]gmail.com
b) Accounting Departement, Universitas Negeri Surabaya
Jl. Ketintang, Surabaya, East Java, Indonesia

Abstract
Casim Coffe is one of the new local coffee products in Jember Regency. Therefore, this study was conducted to explain the consumers assessment of the quality of Casim Coffe products, so that they can be used as a basis for product development. This study used the descriptive method, Fishbein, Importance Performance Analysis (IPA), and the Customer Satisfaction Index (CSI). The satisfaction index level in Casim Coffee products are 86%, so this result concludes that the customer has felt very satisfied with Casim Coffee products. The Casim Coffes smell, taste, price, expired date, packaging, availability, color, and viscosity were in line with customer expectations. The quality of packaging attributes of Casim Coffee, although not in the spotlight of the customers, can exceed the expectations of customers, but Casim Coffee in the packaging attribute does need to be improved because it gets the lowest rating compared to the other seven attributes.

Keywords
Customer Satisfaction Index (CSI), Fishbein, Importance Performance Analysis (IPA), Product Development

Topic
Others (Related to food and agriculture)

Link: https://ifory.id/abstract/Z3WrUaJ6PtEm

Corresponding Author
suripto suripto

Institutions
Program Studi Ekonomi Pembangunan, Fakultas Ekonomi
Universitas Ahmad Dahlan

Abstract
Cigarettes are a significant contributor to the formation of the poverty line. People who smoke have a high risk of poor and dangerous diseases. The demand for cigarettes in Indonesia is classified as high, now Indonesia ranks first in cigarette consumption in ASEAN. This study examines cigarette demand with the Marshallian demand approach. The cigarette demand model includes economic variables, religious knowledge, and intelligence. The cigarette demand model is estimated by multiple regression by incorporating institutional elements in the form of the Muhamadiyah illicit fatwa. The sample used to obtain data was taken from male students of Ahmad Dahlan University. The results of the study are expected to explain the behaviour of smoking demand by referring to the Marshallian demand approach and demonstrating the demand behaviour of cigarettes.

Keywords
Marshalian demand, demand for cigarettes, fatwa haram muhammadiyah

Topic
Economics

Link: https://ifory.id/abstract/D9vLGjCTUzd7

Corresponding Author
NENENG NURHAMIDAH

Institutions
Universitas Negeri Medan

Abstract
The objectives of this study are to examine whether (1) the students achievement in reading comprehension taught by using PLAN (Predict, Locate, Add and Note) strategy is higher than that taught by using RAP (Read, Ask and Paraphrase) strategy, (2) the students achievement in reading comprehension with high interest significantly higher than that of with low interest, (3) there is an interaction between teaching strategies and interest on students achievement in reading comprehension. This study is conducted by using experimental research with factorial design 2 x 2. The population of the study is the students in grade XI of Madrasah Aliyah Swasta (MAS) Al Washliyah Tembung of 2018/2019 acedemic year. The total number of population in this study is 110 students. There are two classes consists of each 32 students are chosen as sample by purposive sampling technique. The instrument of collecting the data are questionnaire and the multiplechoice test of narrative. The data are analyzed by using two-way ANOVA. The result shows that (1) PLAN and RAP strategy are significantly affect the students reading comprehension achievement. Students achievement in reading comprehension taught by PLAN strategy is significantly higher than that taught by using RAP strategy at the level of significance &

Keywords
PLAN strategy, RAP strategy, Interest, Reading Comprehension

Topic
Education and Research Global Issue

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

Corresponding Author
AYUMI ADETYA

Institutions
PENDIDIKAN OLAHRAGA UNIVERSITAS NEGERI MEDAN

Abstract
These studies are developmental studies that aim to produce learning model products. The subjects of the small group trial were 24 students of Public Elementary School 060927 Medan, the subjects of the large group trial consisted of 44 students from the Public Elementary School 060928 Medan. The ultimate goal of this development research is to produce a product in the form of a learning model in the material passing under volleyball, so that it can help the learning process so that student learning can be more effective, efficient, and interesting. In particular there are a number of objectives including: 1) Developing and implementing learning models in elementary school volleyball learning. 2) To obtain in-depth information about learning models in improving volleyball learning outcomes on volleyball. 3) Obtain empirical data about effectiveness, efficiency and attractiveness as a result of developing a learning model in volleyball learning.

Keywords
Learning Model, Lower Passing, Volleyball

Topic
Curriculum, Research and Development

Link: https://ifory.id/abstract/4FXrP9tDJpVx

Corresponding Author
BATUBARA KHOIRUL FIQRI

Institutions
UNIVERSITAS NEGERI MEDAN, JLN WILLEM ISKANDAR PASAR 5, NORT SUMATERA UTARA

Abstract
ABSTRACT In traditional game development research to improve learning result of basic running motion in fourth grade elementary school this is a process used to develop and validate learning product. The research and development in this study uses the Research & Development (R & D) development model. The traditional game development research to improve the learning outcomes of the elementary school running motion consists of three stages, with the design steps of explanation and aligned with the objectives and actual research conditions.

Keywords
Traditional game, basic motion run

Topic
Curriculum, Research and Development

Link: https://ifory.id/abstract/H2kgf8rpChDd

Corresponding Author
D.Yuliana Sinaga

Institutions
UNIMED

Abstract
This study aims to describe the quality of mathematical communication skills of student who are given learning using the Realistic Mathematics Learning (PMR) approach to fraction material. This type of research is a qualitative descriptive case study. The subjects of this study were the fifth grade students of the Medan Markus Private Elementary School totaling 40 people, then the subjects were analyzed qualitatively in terms of the indicators of ability (high, medium and low), aspects of errors and aspects of blank answers. The research instrument consisted of: Tests of mathematical communication skills and interview guide sheets. Data analysis techniques include data collection, data reduction, data presentation and conclusion drawing. The results showed that students mathematical communication skills were 22.5% in the high category, 37.5% in the moderate category and 40% in the low category. Furthermore, through qualitative analysis, it can be concluded that: 1) High-ability students are able to communicate mathematically well; 2) Students who are capable of being unable to communicate mathematically; 3) Low-ability students are not able to communicate mathematically; 4) Students mistakes occur in understanding problems, using concepts and steps needed to solve problems; 5) In blank answers students are not able to understand the steps to solving problems, students are less able to use and apply count operations, students are not able to understand the concepts in problem solving

Keywords
Qualitative Analysis; Mathematical Communication; Realistic Mathematics

Topic
Curriculum, Research and Development

Link: https://ifory.id/abstract/j3vmBaQAfxdJ