Indonesia Conference Directory

Corresponding Author
Rachmah Firstriani

Institutions
(a) Department of Textile Craft and Fashion, Faculty of Creative Industries, Telkom University, Bandung
*rachmafirst[at]gmail.com
(b) Department of Textile Craft and Fashion, Faculty of Creative Industries, Telkom University, Bandung

Abstract
Lygodium flexuosum (L.) Sw. (Schizaeaceae) or paku hata is grown in West Java, especially in Citumang, Pangandaran Regency. The local community of Citumang use paku hata as the main materials to produce crafts such as bracelet, hat, bag, wall hanging, and many more. Unfortunately, the crafter of paku hata in Citumang still can-t show the identity of their product. Because, they don-t have much information about design and less of technique development of paku hata craft product. So, they need to create a way to show the characteristic of Citumang-s paku hata product, which can be applied through the textile technique. Based on the observation, interview and exploration result, natural dye and embroidery technique are applied as patterns that is consists of the meaning of Citumang local value. An effective process is applied on making the natural dye and embroidery technique for paku hata crafter to follow. The application of the techniques is applied on the popular hata bag. The presence of characteristics in Citumang-s paku hata product can give more aesthetic value. Also, the crafter of paku hata in Citumang can have more creativity and insight about production process of paku hata product.

Keywords
Paku hata; Characteristic; Effective

Topic
Design

Link: https://ifory.id/abstract/hRMc9mJrXvab

Corresponding Author
Rizki Fauzan Chairaza

Institutions
Telkom University

Abstract
Bandung Tour on Bus or Bandros is a sightseeing tour around the city using buses from Bandung that are in demand by many tourists both in the city and outside the city, even to government guests. Bandros itself has various routes and colours for tourists to ride, Bandros bus was created to attract tourists from outside the city to visit the city of Bandung (City Branding) with its Art Deco theme, But the formation of Bandros itself is still far from the main theme, the Art Deco. Therefore, to avoid miss conception abour Art Deco definition and design forms, it is necessary to redesign the exterior of the bus Bandros to be closer to the main theme using art deco parametric based on Art. However, to obtain optimal results, authors used an analysis of data based on literature, samples of design, and visual concepts are needed by prioritizing the basic theme of Art Deco and limiting it to government regulations. By using Art Deco parameters, it will avoid misconception in Art Deco on public understanding.

Keywords
Art Deco, Bandros Bus, Exterior, Visual

Topic
Design

Link: https://ifory.id/abstract/7Nav2ZeYf4k8

Corresponding Author
Bibin Rubini

Institutions
Science Education Program of Postgraduate Studies, Universitas Pakuan Bogor

Abstract
The research aims to profile the increase of concept mastery as well as problem solving skills after the implementation learning climate change using problem based model. The implementation of learning was conducted in one of secondary school at rural are in Bogor, west java. The research methods used was quasi-experimental with nonrandomized static group pretest postest design. The experimental class consisted of 40 7th grade students who learned science with problem based learning, meanwhile the control class was the same number of student who learned the science using cooperative learning with teams game tournament (TGT). The increase of concept mastery and problem solving skills were measured by using multiple choice-with reason test. The research shows that problem based learning gave better impact to both of concept mastery and problem solving skills of student, as it was shown statistically using Independent Sample T-Test with the sig value 0,000 and 0,001. The good correlation between concept mastery and problem solving skills was also found with sig value 0.03<0.05. This means that the higher concept mastery the better problem solving skills of student.

Keywords
concept mastery, problem solving skills, problem based learning, cooperative learning

Topic
Learning / Teaching Methodologies and Assessment

Link: https://ifory.id/abstract/dZAhzYcMNf6B

Corresponding Author
Safitri Raufa

Institutions
Magister of Physics Education Department,
Universitas Negeri Medan

Abstract
This study aims to improve the generic skills of science and honesty of students through an Aceh culture-based cooperative learning model with the Culturally Responsive Teaching approach. This research was conducted at the MAS Laboratorium of UINSU. This type of research is a quasi-experimental exercise using two group pretest-posttest design. The sample in his research was class X MIA 1 as the experimental class and class X MIA 2 as the control class. The instrument used was a generic science skill test instrument and student honesty questionnaire. The data in this study were analyzed using the t test and gain test. The results showed that the generic science skills taught by the Aceh culture-based cooperative learning model were better than those taught by the conventional model and there was an increase in student n-gain honesty with the Aceh culture-based cooperative learning model. The results of the study show that physics learning through the Culturally Responsive Teaching approach integrated ethnophysics can develop generic science skills including; direct observation, logical inference, awareness of scale and indirect observation and student honesty

Keywords
Cooperative Learning Model Based on Aceh Culture, Culturally Responsive Teaching, Generic Science Skills

Topic
Education and Research Global Issue

Link: https://ifory.id/abstract/BJHmeVzFw9yA

Corresponding Author
Alina Blume

Institutions
1EMR-Group, Geological Institute, RWTH Aachen University, Wuellnerstr. 2, 52056 Aachen, Germany
2Institute of Geosciences, Kiel University, Ludewig-Meyn-Str. 10, 24118 Kiel, Germany
3Indonesian Institute of Sciences (LIPI)-R.C for Geotechnology

Abstract
The Sea Surface Temperature (SST) of the western Indian Ocean shows a bimodal distribution caused by insolation changes and the migration of the Inter-Tropical Convergence Zone. Moreover, on inter-annual timescales, the western Indian Ocean is influenced by two monsoon periods and two seasonally-occurring events, the Indian Ocean Dipole (IOD) and the El Niño Southern Oscillation (ENSO). An understanding of paleoclimate is essential to better understand these ocean-atmosphere interactions and be able to predict future climate variability. Chemical analyses of corals allow us to reconstruct SST changes in high resolution (monthly-seasonal) and therefore help us to link them to seasonal insolation pattern variations caused by orbital forcing. Here, we use a Sr/Ca record of a fossil Porites coral, which is dated to the mid-Holocene (6k) and covers 16 years. Sr/Ca-ratios were measured using ICP-OES with simultaneous data acquisition. The results show variations in the bimodality and average maximum temperatures of each year. A sudden increase in SST by 1.66° C lasted for about 5 years and suggests a possible positive IOD/ENSO-event.

Keywords
Sr/Ca, coral, SST

Topic
Coastal and Ocean Dynamics

Link: https://ifory.id/abstract/HrZPM6A4tCay

Corresponding Author
Alina Blume

Institutions
1. Indonesian Institute of Sciences (LIPI)-R.C for Geotechnology, 2. RWTH Aachen-Geology Department. *Corresponding author sri004[at]lipi.go.id

Abstract
Indonesia is an important site for climate studies, because of it-s located between Indian and Pacific oceans. Climate phenomena which is happened in the Pacific and Indian oceans i.e El Nino Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) influence Indonesian climate. To understand behaviour of climate phenomena and its impact to Indonesian climate it is required paleoclimate data which provide long time series climate data back to hundred till thousands year. Sea surface temperature is one of important climate parameter. Coral Sr/Ca is convinced as coral paleo-thermometer. In this study, the available coral Sr/Ca is used to reconstruct past SST variability (Coral SST). The variability of coral SST from several sites in Indonesia waters is investigated and compared between sites. The coral SST is also correlated with the Nino 3.4 and IOD indices to know how the climate phenomena influence the SST variability. The result shows that the influence of IOD and ENSO difference between sites. Some sites e.g Seribu island coral SST shows that SST is influenced by IOD rather than ENSO, while from Timor coral SST shows that shows that Indian Ocean Dipole (IOD) influences SST and SSS while ENSO only influences SST

Keywords
Sr/Ca, coral, SST

Topic
Coastal and Ocean Dynamics

Link: https://ifory.id/abstract/A7MzTr4cVJXn

Corresponding Author
Aditia Febriansya

Institutions
(a) Department of Civil Engineering, Politeknik Negeri Bandung, Jalan Gegerkalong Hilir, Ds. Ciwaruga, Bandung 40012 , Indonesia
*aditia.febriansya[at]polban.ac.id

Abstract
At the end of 2016, a significant displacement occurred at P2 pier of Cisomang Bridge at Purwakarta-Bandung-Cileunyi Toll Road KM 100+700, West Java. The shift of pier is caused by the movement of soil under the substructure that has been indicated since 2012. P2 pier is constructed over clay shale which has characteristics when in dry condition, the soil has high shear strength, but when the soil absorbs water or expose in open air, the soil loses its strength. P2 pier displacement results in extreme structural damage, so immediate handling is needed to stop the shifting of the pier. Analysis and reinforcement study are carried out using finite element method. Based on analysis, it is discovered that the existing slope stability safety factor of P2 pier is 1.09, indicating that the soil movement can occur if the clay shale is disrupted. Reinforcement is designed to mitigate the shift of the P2 pier by adding 38 pile foundations to the existing foundation configuration. Each pile have diameter of 1.2 meter with a depth of ±30 meter across the existing slip circle. Reinforcement increases the slope stability safety factor to 1.25, indicating that the P2 pier after reinforcing is in safe condition.

Keywords
Bridge, Substructure, Pier, Foundation Reinforcement, Clay Shale

Topic
Civil Engineering

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

Corresponding Author
Athaya Zhafirah

Institutions
a) Department of Civil Engineering, Politeknik Negeri Bandung, Jalan Gegerkalong Hilir, Bandung 40559, Indonesia
*athaya.zhafirah.mtri15[at]polban.ac.id

Abstract
The low permeability of soft soils results in slow water flows from the consolidation and the low bearing capacity. The soil improvement that can be is by using Prefabricated Vertical Drain (PVD). The use of PVD significantly reduces the length of the soil pore drainage pathway, so that it can increase the bearing capacity of the soil due to the compaction process from the release of pore water from the soil. Experimental testing in the laboratory was carried out using a steel box measuring 1000 mm x 1000 mm x 1000 mm. There are three samples, soil without PVD and soil with PVD triangular patterns of distances of 100 mm and 150 mm. Preloading is carried out before loading on the concrete plate. Concrete plates measuring 700 mm x 100 mm x 30 mm and load media are proving rings with a capacity of 10 kN. The load placed in the center, the end, and the edge of the plate. The loading test results on a concrete plate on soil with PVD can reduce deflection that occurs compared to soil without PVD. Deflection reduction is more effective for PVD with a distance of 100 mm.

Keywords
Soft soil; Prefabricated vertical drain; Concrete plate; Deflection; Experimental

Topic
Civil Engineering

Link: https://ifory.id/abstract/n4X38AbuP6aH

Corresponding Author
Fathur Zaini Rachman

Institutions
a) Electrical Engineering Department, State Polytechnic of Balikpapan
Jl. Soekarno Hatta km.8, Balikpapan 76126, Indonesia
*fathur.zaini[at]poltekba.ac.id

Abstract
In this system using a method that is the application of a multisensor system in detecting the presence of fire, smoke and temperature in the room. The sensors used include KY-026 fire sensor, MQ-9 smoke sensor and DS18b20 temperature sensor. Then the system also implements an intelligent system that is fuzzy logic to process sensor reading data. The three sensor inputs will be processed through the fuzzification stage, then rule evaluation deffuzification. The output of this system is in the form of firm values, namely the values 1 to 5 from the results of the multisensory defuzzification in each module. So that the average error of the defuzzification result is 0.99% after being compared with the MATLAB output. This system is expected to be able to provide early warning of the threat of fire, reduce the risk of casualties, and be able to be implemented to a wider scale or scope.

Keywords
fuzzy, multisensory, KY-026 fire sensor, MQ-9 smoke sensor, DS18b20 sensor.

Topic
Computer Science and Engineering

Link: https://ifory.id/abstract/WBQ9FkNybVrC

Corresponding Author
Amalia Amalia

Institutions
a) Information Technology Department, State Polytechnic of Malang
b) Electrical Engineering Department, State Polytechnic of Malang
Jl. Soekarno Hatta No. 9 Malang 65141, Indonesia
*amalia[at]polinema.ac.id

Abstract
In recent years, the number of coffee shops has grown rapidly in an educational city. Malang as one of the educational cities has numerous coffee shops whose locations spread in various places. This condition makes the consumers having trouble to find the place that meets with their needs of the price and comfort level. In this works, the Geographical Information System of Coffee Shop Business Classification in Malang based on criteria is proposed. This system can classify coffee shop data according to the consumer desires using the Naive Bayes method. Users simply provide a choice of price criteria and desired level of comfort on this website-based system. The classification results are used to make it easier for users to obtain information, both the map of locations and the route to reach the coffee shops that meet the criteria expected by the user. Based on the testing that has been done 100% of users stated that they could find a coffee shop according to the desired criteria and 85% of users stated that the information and location of the coffee shop they got were very useful. As a result, the system promises as the application in determining the selection of coffee shops corresponds to the consumer criteria.

Keywords
Geographic Information Sistem (GIS); Naive Bayes; Criteria; Coffee Shop; Malang

Topic
Information Systems Technology

Link: https://ifory.id/abstract/C8NFc6heyWBP

Corresponding Author
Taufiq Rochman

Institutions
State Polytechnics of Malang

Abstract
The higher story of a building then it will be more vulnerable to its earthquake or seismic responses. The use of seismic devices will reduce earthquake force. In this study, the steel base isolation material has been proposed. This paper aims to design a new steel base isolation system that have good resistance in both of seismic vibration and axial pull out. The building data are 3D mini three-story, six-story, nine-story steel frame structures. The shaking table is used to test with two types of vibration, medium and maximum. FEM analysis using STAAD. Pro V8i was implemented to find the seismic responses. From the calculation results, a reduced response was obtained in conditions of moderate damage to a three-story frame with an average acceleration of 88% reduction, a maximum acceleration of 22% reduction and a six-story frame in heavy damage with an average acceleration of 73% , the maximum acceleration is reduced into 43%.

Keywords
Seismic devices, 3D steel frame, steel base isolation system

Topic
Civil Engineering

Link: https://ifory.id/abstract/UnkjgGBYm97Z

Corresponding Author
Fithriyyah Nur Afifah S

Institutions
Institut Teknologi Bandung

Abstract
This research discusses about cash management of PT XYZ that is engaged in the manufacturing of mechanical structural steel tubes in Karawang, West Java, Indonesia. After having a problem in working capital management on 2014, responsively, the Financial Manager of PT XYZ tried to rearrange the working capital management of PT XYZ. It results a well-managed inventory, account receivable, and account payable of the company. However, in 2016-2017, the value of current ratio, quick ratio, and cash ratio of PT XYZ is far above the average companies in the same industry. This indicates that PT XYZ hasn-t used its current assets or cash efficiently. To solve this problem, the researcher decided to use an approach method since there has been no study that discusses the required cash for carrying out company operations. This approach method consists of benchmarking analysis using cash ratio and pro forma financial statement, financial ratio analysis, and funding strategy analysis so the researcher could find out the cash required by PT XYZ and the impact of cash management implementation towards PT XYZ performance. The researcher also proposed the total cost of each funding strategy to know the most efficient management funding strategy that could be applied by PT XYZ. From the analysis that has been done, the researcher found the monthly cash requirement of PT XYZ and as the result, the cash management implementation will give an increase to both return on assets and total assets turnover, but a decrease to liquidity ratio. The funding strategy that is better implemented by PT XYZ is aggressive strategy because of the total cost is less costly compared to the conservative strategy. However, the decision to choose the funding strategy is rely on the risk characteristic of management and its banking relations.

Keywords
working capital management, cash management, cash requirement

Topic
Financial Management

Link: https://ifory.id/abstract/bNG64kunMpRy

Corresponding Author
Denda Dewatama

Institutions
Department Electrical Engineering, State Polytechnic of Malang

Abstract
Malang City which is located at an altitude between 440 - 667 meters above sea level, and surrounded by mountains. Thus, the city of Malang has many springs and rivers with high speed flow. At present, river flow energy that used as hydroelectric power is very least. River flow hydroelectric power schemes are often presumed to be less ecologically damaging than large-scale storage hydroelectric power schemes, and then low priced materials, easy to use and easy to care for. Therefore, researchers have design of Portable Floating Pico-Hydro (PFPH). PFPH using a low speed DC generator (500rpm, 18VDC, 15A), controller, DC-DC converter and battery as a load. Voltage output of PFPH is set to have a constant output of 14 volts DC with PI control algorithm. Specifications of PFPH are turbine diameter is 500mm, turbine width is 500mm, overall length is 1200mm and overall width is 1200mm. PFPH tested at a water speed of 1.5 m/s - 4 m/s and generated power 10W-223W.

Keywords
Portable Floating Pico-Hydro, hydroelectric, Design, Implementation

Topic
Electrical Power Systems Engineering

Link: https://ifory.id/abstract/b7QRxPgcN6nF

Corresponding Author
Naomi Anggie Agriva Sinambela

Institutions
a) Institut Teknologi Bandung, Jl. Ganesha No.10, Bandung 40132, Indonesia
b) Faculty of School of Business and Management, Institut Teknologi Bandung, Indonesia

Abstract
Employee is one of the most valuable capital in the organization since the organizational goals can be achieved by the existence of the employees. Nowadays organizations come across too many unpredictability challenges in the dynamic and complex business environment. Organizations are now working hard to increase employee commitment and loyalty in order to reduce turnover rates. Employee turnover is one of the most strenuous issues to face organizations since it generates big costs. The strongest signal of actual turnover is the intention of the employee to quit the organization. This research is conducted to explore the relationship of work-life imbalance on turnover intention among employees in Indonesia, with the role of transformational leadership as a moderating variable. The quantitative research method was selected and the questionnaire was used as the research instrument to collect the data. The respondents were employees ranging from 21-45 years old in Indonesia. The moderated regression analysis (MRA) disclosed a noteworthy result of this study, that the work-life imbalance practices will lead to higher turnover intention, and some aspects that affect the work-life imbalance are dissatisfaction, poor behavior/performances, and stress. Further, it was confirmed that this turnover intention among employees weakened after being moderated by transformational leadership.

Keywords
Work-life imbalance; transformational leadership; turnover intention

Topic
Human Resource Management

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

Corresponding Author
Martono Dwi Atmadja

Institutions
1)2)3)4) Department Electrical Engineering, State Polytechnic of Malang.

Abstract
The use of PABX between buildings existed in State Polytechnic of Malang consists of 3 types, which are produced by the same manufacturer. However, the three types of PABX have different characteristics and specifications from one another. Therefore, its merging is done by numbering method which must use prefix to be able to contact users in other PABX. Every PABX is always provided with an interface that aims to combine with different systems, so that adjustments can be made. To overcome this problem, by software-based central installation, namely IPPBX, so that if the change (migration process) occurs, a device called the internet telephone gateway can be installed. This device with one IP address can connect more than one analog telephone number. So far the product has 32 ports. This research uses ITG with 16 ports due to the connection characteristics of the same connector as the conventional PABX. This condition will be easily implemented and does not change the existing network system in State Polytechnic of Malang. The results of the design based on the number of connected services required a number of 32 devices ITG 16 ports plus 4 ports connection to the public services telephone network (PSTN)

Keywords
prefix, interface, analog telephone

Topic
Telecommunication Engineering

Link: https://ifory.id/abstract/fkFACZRTQH6N

Corresponding Author
HESTI WAHYUNI

Institutions
STATE POLYTECHNICS OF MALANG

Abstract
The objective of this research was to examine the impact of competitive advantage, as moderating variable to the relationship between Intellectual Capital and organization performance. This study was a quantitative research and used Partial Least Square method to examine the hypothesis. The Population is listed companies at property real estate and building construction sector, in Indonesian Stock Exchanges. Purposive sampling method is used to collect the data. This study found that differentiation strategy had significant effect to the relationship between intellectual capital value added and organization financial performance.

Keywords
Competitive Advantage, Intellectual Capital, financial performance

Topic
Accounting

Link: https://ifory.id/abstract/azyrJH6PGx9m

Corresponding Author
Nawir Rasidi

Institutions
a,b,c, d) Civil Engineering, Politeknik Negeri Malang
Jl. Soekarno Hatta No. 9 Malang, 65141
*nawir.rasidi[at]polinema.ac.id

Abstract
Lightweight interlocking brick is one alternative to replace conventional clay brick through combustion. This study relates to the design of the proportion of interlocking light brick mixtures as well as concrete sand and foam agent in various percentages and found the optimal percentage of foam agent by testing cylindrical specimens casted for 28 days compressive strength and finally testing each others lightweight brick shear strength lock in full scale model. The final report provided the results of investigative experiments in which compressive strength, water absorption and density were investigated using the optimal percentage of the proportion of foam agent, sand, cement, and aggregate mixture. The results of the experiment are compared to ordinary clay bricks. In conclusion, the concept of lightweight interlocking brick system has been widely used as a replacement of the conventional clay brick system where it has been utilized either as load bearing or non-load bearing brick system. The results show that the brick with foam agent is lighter, more durable aggressive environment and better strength for use in the walls of the building so that it can be mass produced by the brick industry.

Keywords
interlocking, lightweight brick, compressive strength, proportion

Topic
Civil Engineering

Link: https://ifory.id/abstract/GFTk7pjJEy8L

Corresponding Author
Nadira Athayasri

Institutions
a) Faculty of Economic and Business
University of Lambung Mangkurat
Banjarmasin, Indonesia
nadsulaima[at]gmail.com
* wahyudinnor[at]ulm.ac.id

Abstract
This study aims to examine and analyze the influence of the scope and type of information, period of time, and company-s commitment to accounting majors- perceptions for the benefits of Sustainability Reporting. This research is a quantitative study with purposive sampling method. The data were collected by using online questionnaire and obtained a sample of 160 accounting majors from 62 universities in 28 Provinces in Indonesia. The analysis technique used in this study is multiple linear regression. The results of this study shows that the scope and type of information and the company-s commitment influence the perception of accounting majors on the benefits of Sustainability Reporting, while the period of time has no influence on it. In addition, the research indicates that the most important benefits of Sustainability Reporting are related to the ethical and responsible behavior and increase in awareness of environmental and social issues by the company and in enhancing company-s reputation.

Keywords
sustainability reporting; perception; scope and type of information; periode of time; company-s commitment

Topic
Accounting

Link: https://ifory.id/abstract/ZXxtwzv2YVMa

Corresponding Author
Yusuf Hendrawan

Institutions
Universitas Brawijaya

Abstract
Mackerel amplang cracker is a type of fish crackers with the basic ingredients of mackerel fish. The potential of mackerel fish production reaches 5000 tons/year. Moreover, it is supported by the Indonesian governments policies which currently make the marine sector a superior program, so that business licensing of marine and fishery products can be faster. Mackerel amplang cracker processing industry in Tambakasri village, Malang, Indonesia is still facing problems in its production process. This research was conducted in small and medium-sized enterprise (SMEs) Yuan Mina Kartika which produces various fish crackers. The constraints in the SMEs include: 1) the amount of production that has not been optimal, because of the inadequate production tools; 2) the process of refining fish that still uses traditional tools; 3) the process of kneading is done manually so that it takes a long time and produces uneven mackerel fish mixture. The purpose of this study is to develop and to test a cracker dough kneading machine to increase productivity and quality of cracker products. Dough kneading machine uses a kneading system that is driven using an electric motor and transmission. Engine capacity is designed for 100 kg/hour using 1.5 HP with 5 outputs of dough tube. The test results showed a significant increase in time efficiency in the kneading process as well as the quality of the cracker dough which was better than the manual method.

Keywords
amplang cracker; dough kneading machine; mackerel fish

Topic
Sosical Economic and Community Development

Link: https://ifory.id/abstract/462a9xQmDFRh

Corresponding Author
Henry Setiyanto

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

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

Keywords
CPE, MIP, polyglutamic acid, rhodamine-B

Topic
Chemistry

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

Corresponding Author
Henry Setiyanto

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

Abstract
Phenol is an aromatic derivative of hydrocarbons from coal which used as a base for making plastic bottles, cans of packaged food, cosmetics, and pesticides. A large amount of phenol in industrial fields cause phenol easily found in water. However, this compound is emerging as a pollutant in the environment and cause harm to animals. Phenol is also known to be highly reactive to human body tissue if absorbed through skin, breathing, and digestion. In this work, carbon paste electrode based on Ag nanoparticle was developed for the detection of phenol. Carbon paste electrode was modified with Ag nanoparticles which were previously synthesized first and then mixed with graphite and paraffin. The best composition of CPE-nAg is 5:70:25 for Ag nanoparticles, graphite, and paraffin. After measurement using CPE-nAg, it is necessary to remove phenol on the electrode surface with 6 cyclic. Measurement was carried out using square wave voltammetry techniques in the potential range of 0 V to 1,2 V, frequency of 10 Hz, and a scan rate of 75 mV/s. The result showed the presence of an oxidation peak of phenol is 0,475 V in sodium hydroxide 1 M solution.

Keywords
CPE, Ag nanoparticles, voltammetric, phenol

Topic
Chemistry

Link: https://ifory.id/abstract/eNtUbAXZ7C49

Corresponding Author
Henry Setiyanto

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

Abstract
Methylene Blue (MB) is a dye commonly used in the textile industry. Dyes waste from the textile industry harms the ecosystem of the environment. One method of textile dye waste degradation is mediated electrochemical oxidation. This method uses an oxidation-reduction process using metal ion as a mediator. The mediator metal ion acts as an oxidizer which oxidizes textile dyes waste into simpler compounds, namely CO2 and H2O. The mediator ion used in this study was Ce (IV) in an acidic. The results of the degradation were analyzed using the voltammetry method. In voltammetry there are three electrodes are used, namely working electrode, reference electrode, and auxiliary electrode. This study used a carbon paste electrode as a working electrode, a platinum wire as an auxiliary electrode and a homemade Ag/AgCl as a reference electrode. The results of the characterization of the Ag/AgCl reference electrode showed that the Ag/AgCl had the same characteristics as the BAS commercial reference electrodes (bioanalytical systems). The results of cyclic voltammogram showed that the oxidation potential value of MB is 0.2880 V. The oxidation and reduction potential of Ce (III)/Ce (IV) in 0.2 M H2SO4 were 1.2400 V and 0.4520 V. This potential value indicates that the MB oxidation potential was not disturbed by the mediator ion potential. The optimum condition of electrodegradation was obtained at 250 ppm MB in 0.2 M H2SO4 with the addition of 0.015 M Ce (III) for 30 minutes using the potential of 6 V.

Keywords
Methylene Blue, MEO, degradation, cerium

Topic
Chemistry

Link: https://ifory.id/abstract/fngw7ar4xJpy

Corresponding Author
Galuh Yuliani

Institutions
Chemistry Department, Universitas Pendidikan Indonesia, Jalan Dr. Setiabudi 229 Bandung 40154, West Java, Indonesia

Abstract
Coal bottom ash (CBA) waste generated from coal-based industries has been increasing at an alarming rate causing huge problems in its recycling and disposal process. On the other hand, CBA is potentially used as raw material in zeolite manufactures due to its high SiO2 and Al2O3 contents. We report the conversion of CBA into zeolites-like material via a low temperature method of 90°C for 24 h using NaOH solution. The synthetic zeolite was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), and BET surface area measurement. The study of its adsorption-desorption properties was also conducted using ammonium solution. FTIR spectra confirmed characteristic zeolite peaks at 980-1170 cm-1, 740.6 cm-1, 439.7 cm-1, 559.3 cm-1 for Si-O, Al-O and Si-O-Al absorptions, respectively. XRD results indicated the formation of sodium aluminosilicate hidrate belong to the zeolite structure group at NaOH 5M ratio of 1:8. XRF results also indicated the domination of Al2O3 and SiO2 in the zeolite composition. BET analysis resulted the surface area of zeolite was 60.38 m2/g, markedly increased from the initial surface area of CBA of 0.598 m2/g. The maximum adsorption capacity for ammonium ions were 85.22 mg/g and the adsorption data fitted the Freundlich isotherm model. Meanwhile, the desorption study indicated that the ammonium leached rapidly in the first 3 h followed by a plateu in the next 71 h.

Keywords
bottom ash; zeolite; adsorption; desorption; ammonium

Topic
Chemistry

Link: https://ifory.id/abstract/7vdQM4wzPbxg

Corresponding Author
Cicyn Riantoni

Institutions
Physics Education Department, Faculty of Education, Universitas Jambi, Jl Lintas Jambi-Muara Bulian Km 15, Muaro Jambi 36361, Jambi, Indonesia
cicynriantoni12[at]gmail.com

Abstract
In agreement with conceptual understanding, identifying of problem solving skill is an important topic in physics. The purpose of this research was to explore students problem-solving skills based on expert and novice category. The research used a mixed method approach with an explanatory model with 34 prospective physics teacher at the Jambi University, Indonesia. The data was obtained by using open-ended questions. Data were collected using tests and interviews. Data analysis was done by using paired t-test and rubric for physics problem-solving skills. Problem-solving skills were classified into expert and novice. The research showed that most students have problem solving skill by novice categories. The cause is the weak application of concepts in the problem solving process. The research conclude application of concept in the process of problem solving not well understood by most student be the reason most student have categories novice ability in problem solving.

Keywords
problem solving skills; expert; novice

Topic
Physics Education

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

Corresponding Author
GUNAWAN WIDJAJA

Institutions
Universitas Tarumanagara

Abstract
Objective: This research aimed to elaborate the role of pharmacists in hospital to establish good hospital governance in accordance with Indonesian rules and regulations. Method: This research is a normative research. Data were obtained through literature search using “google machine” with “good hospital governance”, “pharmacists- role in hosptal”, “pharmacists- regulations in indonesia” as keywords. Data were analyzed using qualitative method. Collected raw data were reduced to the most relevant data by conducting content analysis. The relevant data were used to analyze the purpose of the research. Results: Good hospital governance needs a good administration of alll hospital activities that support the madical care, and good clinical governance in providing medical care for patient safety. Finding proved that there were not many provisions in the rules and regulations that govern the role of pharmacists in hospital. However those provisions were sufficient enough to justify the role of pharmacists to assist “creating” and maintaining good hospital governance. Conclusion: Pharmacists have two important but different side by side roles in good hospital governance settings.

Keywords
hospital governance, pharmacist- role, clinical governance

Topic
Other Hospital Issue

Link: https://ifory.id/abstract/guXaryN9ZPxH

Corresponding Author
Agustina Widiyani

Institutions
1Theoretical Physics Laboratory, THEPI Division, Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia.
2Department of Physics, Faculty of Sains, Institut Teknologi Sumatera, Jl. Terusan Ryacudu, Jati Agung Lampung Selatan 35365, Indonesia.
3Indonesia Center for Theoretical and Mathematical Physics (ICTMP), Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia.

a) a.widiyani[at]students.itb.ac.id
b) agussuroso[at]fi.itb.ac.id
c)fpzen[at]fi.itb.ac.id

Abstract
We study the scenario of dark energy model that constructed by combination of scalar fields from quintessence and nonminimal derivative coupling terms. We assumed that there will be exchange between the scalar fields of quintessence and nonminimal derivative coupling and the ordinary matter do not explicitly coupled with the dark sector. Using the dynamical system analysis, we determine the stability of our model and find the attractor solution.

Keywords
Dark energy, scalar field, quintessence, nonminimal derivative coupling, dynamical system

Topic
Theoretical High Energy Physics

Link: https://ifory.id/abstract/tV7zj6kwqcHR

Corresponding Author
Dyah Aryantini

Institutions
1. Departemen Biologi Farmasi, Fakultas Farmasi, Institut Ilmu Kesehatan Bhakti Wiyata, Kediri
2. Program Studi S1 Farmasi, Fakultas Farmasi, Institut Ilmu Kesehatan Bhakti Wiyata, Kediri

Abstract
Daun srikaya mengandung senyawa fenolik dan flavonoid yang dapat digunakan sebagai antioksidan, antidiabetik, hepatoprotektif, antitumor. Fermentasi menyebabkan perubahan senyawa kimia sehingga mempengaruhi bioaktivitas tanaman. Tujuan dari penelitian ini adalah untuk mengetahui kandungan total fenolik dan flavonoid pada ekstrak daun srikaya dan ekstrak daun srikaya terfermentasi probiotik dengan lama fermentasi 24, 48 dan 72 jam. Ekstraksi daun srikaya dengan metode maserasi menggunakan pelarut etanol 70%. Penetapan kandungan total fenolik dan flavonoid menggunakan spektrofotometri UV-Vis. Kandungan total fenolik ditetapkan dengan asam galat konsentrasi baku seri 40, 55, 70, 85, 100 ppm, penentuan kandungan total flavonoid dengan kuersetin konsentrasi 40, 65, 90, 115, 140 ppm. Hasil penetapan kandungan total fenolik ekstrak adalah 4,028±0,064 mgGAE/g, sedangkan kandungannya pada ekstrak terfermentasi berturut-turut pada 24, 48, 72 jam yaitu 8,817±0,079 mgGAE/g; 7,391±0,018 mgGAE/g; 5,997±0,078 mgGAE/g. Kandungan total flavonoid ekstrak 3,861±0,041 mgQE/g, pada ekstrak terfermentasi jam ke-24, 48, 72 berturut-turut yaitu 17,022±0,392 mgQE/g; 11,691±0,268 mgQE/g; 9,227±0,243 mgQE/g. Kesimpulan yang diperoleh adalah proses dan lama fermentasi mempengaruhi kandungan total fenolik dan flavonoid pada ekstrak daun srikaya dan ekstrak daun srikaya terfermentasi.

Keywords
srikaya, ekstrak terfermentasi, total fenolik, lama fermentasi

Topic
Bioteknologi dan Molekular Tanaman Obat

Link: https://ifory.id/abstract/Re2juTJfGY4z

Corresponding Author
Maratu Soleha

Institutions
Badan Litbangkes Jakarta

Abstract
Tumbuhan jengkol (Pithecellobium lobatum Benth) merupakan salah satu tumbuhan yang digunakan oleh masyarakat Indonesia sebagai obat tradisional. Daun jengkol berkhasiat sebagai obat kudis, luka, bisul, dan kulit buahnya digunakan sebagai obat borok karena mengandung saponin, flavonoid, dan tannin. Pada penelitian lain di temukan khasiat kulit jengkol yang aktif menghambat bakteri MRSA. Pada Penelitian ini di lakukan uji terhadap kandungan ekstrak ethanol kulit Jengkol dengan kromatografi gas GCMS dengan membandingkan peak kromatogram dari spektrum yang di hasilkan dengan NIST Library. Berdasarkan prosentase kemiripan peak tunggal yang terbentuk dengan abundancy 90% maka metabolit yang terdapat dalam ekstrak tersebut adalah 1,2-Benzenedicarboxylic acid, mono (2-ethylhexyl) ester dengan kemiripan 90%, Phthalic acid, 2-ethylhexyl hexyl ester dengan kemiripan 68%, 1,2-Benzenedicarboxylic acid, diis ooctyl esters dengan kemiripan 60%uatu senyawa yang termasuk dalam golongan asam Phtalat salah satu derivate dari asam karboksilat . Berbagai derivate asam phtalat seringkali di gunakan sebagai plasticizer pada pembuatan PVC. Asam phtalat yang terbentuk cukup tinggi konsentrasinya dengan kemurnian yang tinggi. Ektrak ethanol daun jengkol dapat di kembangkan dengan pemurnian lebih lanjut untuk menghasilkan asam phtalat yang berasal dari tumbuhan

Keywords
Pithecellobium lobatum Benth, GCMS, Asam Phtalat

Topic
Farmakognosi dan Fitokimia

Link: https://ifory.id/abstract/zphWYt9MwgJ7

Corresponding Author
Maratu Soleha

Institutions
Badan Penelitian dan Pengembangan Kesehatan

Abstract
Bioprospecting merupakan salah satu cara meneliti tanaman obat untuk mendapatkan manfaat dari efek farmakologis dan memberi nilai tambah dari sisi perekonomian. Efek farmakologis dari di uji secara experimental. Nilai ekonomis juga dapat di lihat dari kebutuhan obat berdasarkan prevalensi penyakit. Di Indonesia kebutuhan artemisinin untuk pengobatan malaria cukup besar dengan prevalensi malaria tahun 2013 adalah 6,0 persen. Tanaman artemisinin yang berasal dari China dapat tumbuh di Indonesia sehingga dapat di kembangkan lebih lanjut pemanfaatanya. Artemisinin yang memponyai struktur jembatan peroksida banyak di teliti adalah melalui pembentukan radikal bebas sehingga dapat menyebabkan kematian sel(Apotosis) Di samping untuk pengobatan malaria artemisinin artemisini diketahui memiliki antibakteri, antijamur, antileishmanial, antioksidan, antitumor, dan aktivitas anti-inflamasi. Artemisinin di gunakan sebagai antimalaria saat ini sesuai dengan guideline dari WHO dalam bentuk Artemisinin combination therapy (ACTs) dengan pipegauin atau pirimetamin. Artemisinin sebagai anti kanker telah di uji klinik skala pilot. Artmisinin sebagai antibiotik susceptible pada beberapa bakteri gram negative dan positif, E.coli dan H. Pilory. Artemisini juga telah diuji khasiatnya sebagai anti inflamasi dan anti oksidan.

Keywords
Artemisinin, Antimalaria, Kanker, Antibiotik, Jembatan peroksida

Topic
Farmakologi dan Klinik TOOT

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

Corresponding Author
Poppy Anjelisa Zaitun Hasibuan

Institutions
1Departemen Farmakologi, 2Departemen Biologi Farmasi
Fakultas Farmasi, Universitas Sumatera Utara, Medan 20155

Abstract
Latar Belakang: Senyawa fenol terutama flavonoida adalah antioksidan yang dapat melawan pengaruh bahaya dari radikal bebas yang terbentuk sebagai hasil metabolisme oksidatif, yaitu hasil dari reaksi kimia dan proses metabolik yang terjadi didalam tubuh. Metode: Penelitian ini menggunakan daun Afrika (Vernonia amygdalina Delile.) yang dimaserasi dengan pelarut etilasetat. Maserat yang didapatkan diuapkan pelarutnya dengan penguap vakum putar hingga didapat ekstrak kental, selanjutnya dilakukan penentuan kandungan fenol total dan flavonoid total dilakukan dengan metode kolorimetri. Hasil: Hasil penentuan kandungan fenol total dari ekstrak etilasetat daun Afrika adalah 61,15 ± 0,73 mg GAE/g dan kandungan flavonoid total adalah 58,15 ± 0,17 mg QE/g. Kesimpulan: Ekstrak etilasetat daun Afrika memiliki kandungan fenol total dan flavonoid total yang cukup tinggi.

Keywords
Fenol total, flavonoid total, ekstrak, daun Afrika (Vernonia amygdalina Delile.).

Topic
Farmakognosi dan Fitokimia

Link: https://ifory.id/abstract/BkTR79xXKNbd