Indonesia Conference Directory

Corresponding Author
Rina Lusiani

Institutions
Mechanical Engineering Department, Universitas Sultan Ageng Tirtayasa

Abstract
In order to increase the use of new renewable biomass energy in Indonesia, various methods are carried out, one of which is to increase gasification efficiency and performance. One way to improve efficiency and performance is to use a furnace that matches the characteristics of the gas produced. This study aims to design an appropriate gasification furnace. In this study we will cook liquid palm sugar on the vaccum drier and compare the performance and efficiency using and without using a gasification furnace with rice husk biomass. The test results showed a significant increase in performance and efficiency with the use of this furnace.

Keywords
Gasification, Stoves, Vaccum Driers

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/NVjJHfuQC7vq

Corresponding Author
Farah Ayu Ridhani

Institutions
a) Department of Civil Engineering, Faculty of Engineering, University of Indonesia
Jalan Kampus UI, Kukusan, Beji, Depok, Jawa Barat, 16424
Indonesia

Abstract
There are a lot of direct methods to estimate bearing capacity of pile foundation using cone penetration test (CPT). Hence, it is interesting to evaluate which method that suitable for a certain condition or specific locations. This paper tries to analyse the results of CPT direct method calculations for the pile foundations that were constructed in Jakarta, Indonesia. The pile capacities are determined using the following methods: Schmertmann, de Ruiter dan Beringen, LCPC, Aoki and De Alencar, Penpile, Price and Wardle, Philipponnat and Wesley. The pile capacities will be compared to the measured pile capacities from static pile load tests,which interpreted by Chin method and Decourt method, and the results from PDA testing. The statistical analyses used in this paper are the best fit line of the predicted pile capacities versus the measured pile capacities, and the mean and standard deviation of the ratio between the predicted pile capacities and the measured pile capacities. In general, the result of the CPT direct methods calculations are mainly underpredicted. Results showed that Philipponnat is the most appropriate method in the studied location with average value of ratio between the predicted pile capacities and the measured pile capacities is roughly 1.03.

Keywords
direct method; cone penetration test; pile foundation

Topic
Civil Engineering

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

Corresponding Author
Novia Novia

Institutions
Chemical Engineering Department, Faculty of Engineering, Universitas Sriwijaya, Jl. Raya Palembang-Prabumulih km.32, Inderalaya, Ogan Ilir, Sumatera Selatan, 30662, Indonesia.
*novia[at]ft.unsri.ac.id

Abstract
The development of alternative energy sources from renewable natural resources has been carried out regulerly. One of the alternatives is the utilization of agricultural waste such as rice husk to produce bioethanol. However the cellulose content in rice husk is blocked by complex lignoseulosic matrices such as lignin which will disrupt the hydrolysis process. The pretreatment is needed to break the bond. In this study, pretreatment was carried out using the Aqueous Ammonia Soaking (AAS) and dilute acid methods with various ammonia concentration and temperature of pretreatment. The composition of rice husk was analyzed using Chesson methods. Three series of works were carried out, namely pretreatment, hydrolysis and fermentation. Pretreatment was carried out with various concentration of 5, 10, 15, 20, 25 % (v/v) and temperature of 60, 70, 80 90, 100 oC. The highest cellulose content was about 57.94% at ammonia concentration of 20% (v/v) and a temperature of 100 oC. Furthermore, enzymatic hydrolysis produced the highest glucose of about 24.1774 ppm and bioethanol of 11,21%.

Keywords
Aqueous Ammonia, Bioethanol, Dilute Acid, Fermentation, Hydrolysis

Topic
Chemical Engineering

Link: https://ifory.id/abstract/aEDZx4KUvb3T

Corresponding Author
Manik Mahachandra

Institutions
a) Industrial Engineering Department, Faculty of Engineering, Diponegoro University
*manik.mahachandra[at]ft.undip.ac.id
b) Industrial Engineering Study Program, Faculty of Industrial Technology, Islamic University of Indonesia

Abstract
Distraction experienced by the driver while driving is something that can reduce the level of performance, concentration, and attention of the driver. In 2013, 29.3% of the total 100,106 accidents occurred due to drivers who were careless or lacking in concentration. The driver-s level of performance while driving can be measured through a variety of methods, including the response time given by the driver to a stimulus given while driving, spare attentional capacity measured by the percentage of drivers shifting their gaze while driving, and driver alertness that can be measured through driver sleepiness . The three methods are measured on the driver while driving with distractions and without distractions, this is intended to determine the difference in the driver-s performance level while driving with distraction and without distraction. Based on the results of measurements on the three methods, two of the three methods are obtained, namely response time and spare attentional capacity have significantly different results between driving with distraction and without distraction. However, the driver-s alertness level measured through the driver-s sleepiness level does not show a significant difference between driving with distraction and without distraction.

Keywords
Distraction; driver; simulator

Topic
Industrial Engineering

Link: https://ifory.id/abstract/76LF9qj2yfZz

Corresponding Author
Dandun Mahesa Prabowoputra

Institutions
1.Department of Mechanical Engineering, Sebelas Maret University, Jl. Ir. Sutami 36 A, Central Java, Surakarta, 57126 Indonesia
2.Graduate School of Mechanical Engineering, Sebelas Maret University, Jl. Ir. Sutami 36 A, Central Java, Surakarta, 57126 Indonesia
3. Interdisciplinary Program of Marine Convergence Design, Pukyong National University, Busan 48513, South Korea

Abstract
Environmental risk due to excessive residual emission from fossil-based fuel on transportation engine and industrial process is rising as market rivalry becomes intensive between superpower countries. Greenhouse effect, ice melting in Arctic, reduction of air quality are several of main concerns which need immidiate development and change. Energy harvesting equipment is one of the key solutions. environment potential, e.g. Water resource can be collaborated with mechanical equipment to harvest clean energy. Savonius water turbine has been proposed and studied for this purpose and can be placed on several water resources. Still, real-world implementation of this technology is lack, especially in tropical archipelago countries which have abundant water resource. In this work, assessment of savonius water turbine as instrument to harvest clean energy is conducted. Reduction of air pollution is estimated in order to provide environmental signification as affected by savonius in producing alternative clean energy.

Keywords
savonius water turbine, water resource and flow, geographical area, non-fossil energy, emission reduction

Topic
Mechanical Engineering

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

Corresponding Author
Gunawan Gunawan

Institutions
Universitas Indonesia

Abstract
Recently, the shipbuilding industry has been able to develop new production methods. This new methods promotes design automation in order to produce ships more efficiently. Engine room design, including the piping system, is a complex process especially in the pipe routing problem. This process requires a considerable number of man hours. This paper presents a new approach for optimization of pipe routing system. The Dijkstra-s algorithm is used to obtain short path by considering some constraints like number of pipe bends and pipe cross. The method works by generating some candidate paths based on the given paramaters geometrically. The non-geometric paramaters such as material cost and installation cost will also be assesed. Then by using the algorithm, the desire option from various candidate paths will be evaluated. This study discusses the details of the above methods. In addition, simulation test of a several piping systems were carried out to illustrate the pipe routing design procedure in detail and to verify the effectiveness of the proposed methodology.

Keywords
Pipe Routing; Optimization; Piping system; dijkstra algorithm

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/Anu4HLgDaeMB

Corresponding Author
Agus Putu Abiyasa

Institutions
Universitas Pendidikan Nasional

Abstract
We report a design for optimum humidity and temperature control system based on a low cost open source Arduino Microcontroller. The system is implemented in a 20 kV high voltage cubicle compartment for Lokomboro Microhydro Power Plant at Sumba, Indonesia. Due to high water vapor, humidity inside the cubicle is very high (>70%) creating plasma arching and destroying the cubicle. By installing blower and heater coupled with humidity and temperature sensors, we manage to prevent the arching by removing the excess water vapor. With automatic control, manual checking has been reduced to twice a year. Furthermore, blower and heater operation time has also been reduced to 14 hours a day. Therefore, the Lokomboro Microhydro Power Plant has operated with minimum maintenance cost and longer cubicle lifetime.

Keywords
Microhydro power plant, Plasma arching, Arduino microcontroller

Topic
Electrical Engineering

Link: https://ifory.id/abstract/hbkeTQq4Udxn

Corresponding Author
Teuku Edisah Putra

Institutions
Department of Mechanical Engineering – Universitas Syiah Kuala
Darussalam, Banda Aceh 23111, Indonesia
*edi[at]unsyiah.ac.id

Abstract
This study aims to identify the effect of road surface contours on the fatigue life of a coil spring and a lower arm. In this study, strain gauges were installed at the critical points of the components based on stress distributions. According to the chemical composition tests, the coil spring was made from SAE 5160 and lower arm was made from AISI 1513. Strain signals obtained were analyzed using the Coffin-Manson, Morrow, and Smith-Watson-Topper models. Based on the strain signals, it was found that when the vehicle was driven on the rough road, coil spring and lower arm received higher stresses contributing to a shorter fatigue life. The fatigue life of the coil spring when was driven on the rough road was 7 % lower than when was driven on the smooth road. Meanwhile the fatigue life of the lower arm when was driven on the rough surface was only 0.03 % lower than when was driven on the smooth road. It indicated that the coil spring will fail faster than the lower arm. This is because the contour of the road surfaces provide a vertical load so that it is in accordance with the function of the coil spring which works to reduce the load vertically, while the lower arm functions to hold the load when turning.

Keywords
Vibration, stress, strain, failure.

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/hxqKBUZW3Dnm

Corresponding Author
Muhammad Adha Ilhami

Institutions
Universitas Gadjah Mada;
Universitas Sultan Ageng Tirtayasa

Abstract
Three-dimensional concurrent engineering (3DCE) concepts provide new approach for integrating product, process, and supply chain design and give companies the opportunities to shorten product development lead time and time to market eventually, increase product variant and quality, and reduce product development cost. However, the 3DCE approach is not comprehensive yet since the researches are continuing and growing. This article provides bibliometric literature review on 3DCE as a term and concept through mainly Scopus database and Mendeley software for managing and resuming the references. After manual filtering and reading we conclude 37 articles strongly related to the term of 3DCE. Finally, we classify the articles based on its keywords into three cluster of words using VOSviewer software. We find that "supply chain", "new product development", and "3dce" are the most frequently words of those articles which represent the research stream or the researcher-s background.

Keywords
3DCE; integrated product development; VOSviewer

Topic
Industrial Engineering

Link: https://ifory.id/abstract/WFLn9kXUhfVN

Corresponding Author
Hans Thiery Tjong

Institutions
Mechanical Engineering Universitas Indonesia

Abstract
The analysis of central mass system has developed the stability control over devices by applying Newton-s law of central gravity. The central mass of a body can be shifted to a desired position for stability. The moment system can be applied in predicting central mass position in order to keep the body from falling over a slope by calculating speed, mass and central mass position. This system will be implemented by liquid movement or other object movement which will shift the central mass position.

Keywords
amateur, assistance, bicycle, stability

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/QVwahNF8CdJT

Corresponding Author
Atmy Verani Rouly Sihombing

Institutions
1,2,3 Civil Engineering Department, Faculty of Civil and Environmental Engineering
Institut Teknologi Bandung, Indonesia
4 Research and Development Center for Road and Bridge, Ministry of Public Works and Public Housing, Indonesia

Abstract
This study investigated the use of bio-asphalt, derived from coconut shell (BioCS) and straw (BioST) as an additive to determine its benefits in asphalt mixtures containing reclaimed asphalt pavement (RAP). The study was conducted by determining and comparing the laboratory performance properties of four mixtures and the binders extracted from the mixes. The four mixtures evaluated in this study included 30% RAP mixtures with and without bio-asphalt (BioCS and BioST) and comparable virgin mix. The result showed that bio-asphalt was effective in improving mixture performance of 30% RAP mix close to those of the virgin mix.

Keywords
Bio-asphalt, Asphalt Mixture, RAP

Topic
Civil Engineering

Link: https://ifory.id/abstract/NA9dxLJfQuWj

Corresponding Author
Eka Sari

Institutions
Chemical Engineering department, Engineering Faculty universitas sultan ageng tirtayasa

Institute of Bioproduct Development, Universiti Teknology Malaysia

Abstract
Shrimp shells are widely produced from shrimp-based food industry as a waste. The waste of shrimp shell can be used to produce chitosan, it need three stages of process namely deproteination, demineralization and deacetylation. Furthermore, the chitosan is made into chitosan nanoparticles by precipitation method using ammonia. The ammonia is added to chitosan solution with acetic acid. The resulting nanochitosan was tested on blood clots as a biocoagulant agent of various blood types. The results showed that the chitosan have the acetylation degree of about 68.67%. The chitosan nanoparticles obtained particle size of 782.6 nm for condtion of concentration of amonia15% addition and duration of stirring for 10 minutes. The clotting tests showed that the addition of nanochitosan can accelerate blood clots but the rate of blood clotting shows different results from each blood types. A bloodless without nanochitosan freezing at 604.5 second and blood clotting with significant time difference was shown in A types of blood only during 372 seconds.

Keywords
Waste, shell, Shrimp, Nanochitosan, Biocoagulant, Blood

Topic
Chemical Engineering

Link: https://ifory.id/abstract/qdTMLQBycZr6

Corresponding Author
Naya Prakasita Putri

Institutions
(a) Biorefinery Lab, Bioprocess Engineering Program, Chemical Engineering Department, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, 16424, Indonesia
*mgozan[at]che.ui.ac.id

Abstract
Biosurfactant is produced by a certain microorganism to reduce surface tension. Microbial enhanced oil recovery (MEOR) is one of the many applications of biosurfactant. However, the biosurfactant for MEOR needs to be able to withstand the extreme environment of oil reservoirs with high temperature and high salinity. Halomonas meridiana BK-AB4 is a halophilic bacteria obtained from the Bledug Kuwu crater in Central Java, Indonesia. The similarity of both environment condition indicates the potential to produce suitable biosurfactant. This study evaluates the potential of Halomonas meridiana BK-AB4 in producing biosurfactant compared to several bacteria isolated from the crater. The blood agar test of Halomonas meridiana BK-AB4 exhibited greenish discoloration around the colony, indicating the ability of type α-hemolysis. The interfacial tension was measured using the Du Nouy ring method to represent the biosurfactant activity, with the results of 0.014 dyne/cm. The optimum time of the culture starter for production is 6 hours, as determined from the bacterial growth curve.

Keywords
Biosurfactant; Blood agar test; Halomonas meridiana BK-AB4; Interfacial tension

Topic
Chemical Engineering

Link: https://ifory.id/abstract/A89tr3pYxKDg

Corresponding Author
Yeni Variyana

Institutions
a) Department of Chemical Engineering, Institut Teknologi Sepuluh Nopember
Sukolilo, Surabaya 60111, Indonesia
*mahfud[at]chem-eng.its.ac.id

Abstract
Garlic (Allium sativum L.) has compounds that could be used as anti-microbial, anti-atheroschlerosis, anti-oxidant, anti-viral, anti-cholesterol, anti-diabetic, anti-hypertension, and anti-cancer. In this paper, oils was extracted from Garlic using Solvent Free Microwave Extraction (SFME) method without solvent which is as an alternative technique to produce oil without a solvent and and it has several advantages in terms of product quality. This research used Microwave Hydrodiffusion and Gravity (MHG) technique for process extraction and produce high yields of garlic oil. The highest results were obtained from this study when at 100 g, 450 W and 10 min. Response surface methodology was designed to evaluate the effects of mass of raw material (g), microwave power (W) and extraction time (min) for optimization of analytical methods. Regression models have designed and predicted experimental values well. Gas chromatography-mass spectrometry technology was used to analyze the chemical compositions of garlic oil. The results showed that sulphide compounds, like diallyl disulphide, trimethylene trisulfide, ester and alcohol which is found in garlic oil.

Keywords
Allium sativum L.; Garlic Oil; MHG; Optimization; SFME

Topic
Chemical Engineering

Link: https://ifory.id/abstract/k4hQegnVuPdR

Corresponding Author
Endarto Y. Wardhono

Institutions
1 University of Sultan Ageng Tirtayasa, Cilegon, 42435, Banten, Indonesia
2 Sorbonne Universités, Université de Technologie de Compiègne, Integrated Transformations of Renewable Matter Laboratory (EA TIMR 4297 UTC-ESCOM), rue du Dr Schweitzer, 60200 Compiègne, France

Abstract
In this work, the evolution of dispersed droplets formation in a water-in-oil, W/O emulsion was observed using calorimetry technique. The emulsion was prepared by dispersing drop by drop of an aqueous phase into an oil continuous phase at room temperature using rotor-stator homogenizer. The droplets formation during: (1) formulation; (2) stabilization (3) and destabilization were observed using Differential Scanning Calorimertry, DSC. The samples were gently cooled-down below to its solid-liquid equilibrium temperature then heated back above the melting point to determine its solidification temperature. The energy released during the process was recorded in order to get information about the water droplet dispersion state. The mean droplet size distribution of the sample emulsion was correlated to its solidification temperature and the morphology was followed by optical microscopy. The results indicated that the calorimetry technique so far are a very good technique to characterize of W/O emulsion system

Keywords
DSC, W/O emulsion, dispersed droplets, solidification temperature, droplet size distribution

Topic
Chemical Engineering

Link: https://ifory.id/abstract/qY4EnkXAT2u6

Corresponding Author
Restu Wigati

Institutions
(a) Civil Engineering Dept.,Universitas Sultan AgengTirtayasa,Cilegon 42435, Indonesia
*restu.wigati[at]untirta.ac.id
(b) Mechanical Engineering Dept.,Universitas Sultan AgengTirtayasa,Cilegon 42435, Indonesia
*hamdan_an[at]untirta.ac.id

Abstract
Flood problems become a crucial problem in the city of Jakarta. Jati Pinggir - Petamburan area is one of the affected floods. The density of the population and the narrower open land for water absorption causes the accumulation of standing water. The increased flow of water inundation affects channel capacity. For this reason, it is necessary to examine the ability to exist flood control buildings such as drainage canals, reservoirs and pump houses to deal with flooding with a 10-year return flood discharge in Jati Pinggir - Petamburan. Analysis of regional rainfall data, 10-year return period flood discharge, existing channel dimensions, the capacity of the pond and pump needs were used in this study.

Keywords
Jakarta floods, drainage, ponds, pump houses

Topic
Civil Engineering

Link: https://ifory.id/abstract/ZT87KdgU6vY4

Corresponding Author
Lucky Wahyu Nuzulia Setyaningsih

Institutions
a) Department of Chemical Engineering, Islamic University of Indonesia, Yogyakarta, INDONESIA
*lucky.nuzulia[at]uii.ac.id

Abstract
This paper present the conversion of cellulose based on water hyacinth into hydrogel. The water hyacinth cellulose was prepared using acid-alkaline treatment and bleaching. The cellulose properties was optimized by varying the extraction condition such as solvent concentration and temperature. The analysis method of FTIR and XRD were used for characterizing the functional groups and crystallinity of cellulose. The effective condition of extraction were achieved at solvent concentration 17,5% w/w of NaOH, 8% v/v of H2O2 as bleaching agent and temperature of 80oC. The extracted cellulose was used to produced hydrogels using poly vinyl alcohol and glutaraldehide as crosslinker agent. The research revealed that adding of glutaraldehide with ratio 1:2 at 25oC give the highest water absorption capacity of 285%.

Keywords
Cellulose; Water Hyacinth; Gluaraldehyde; Hydrogel

Topic
Chemical Engineering

Link: https://ifory.id/abstract/8q6gkUzdebMC

Corresponding Author
Fadil Muhammad

Institutions
Departement of Electrical Engineering
Universitas Sultan Ageng Tirtayasa
Jl. Jendral Soedirman KM 03. Cilegon - Indonesia
a) fadil.muhammad[at]untirta.ac.id
b) ceri.ahend[at]untirta.ac.id
c) masjudin[at]untirta.ac.id

Abstract
In the 4.0 industrial revolution, technologies are designed to be able to connect to the internet. These technologies should be able to exchange data between them using sensors and others. One of the ways to send it is by the wireless sensor network. However, involving the internet in exchanging data needs security guarantees. Three things must meet in network security, that is confidentiality, integrity, and availability. Cryptography use for the confidentiality of the information that will be sent by the user. In this research will be using the symmetric cryptography for network security on wireless sensor networks. In addition to network security, symmetric cryptography method will be used also consider energy efficiency on a wireless sensor network. Chacha stream cipher as symmetric cryptography will be used as a method of messages encryption. Experiments in this research used NS-3 as a network simulator. Results of the tests show that the purpose method has a computation time of 0.2385 ms and the second fastest after the rabbit cryptographic process. Chacha LR WPAN simulation process has a computation time of 17.6199 ms.

Keywords
Wireless Sensor Network, Cryptography

Topic
Electrical Engineering

Link: https://ifory.id/abstract/Wx6JCD3BHLqR

Corresponding Author
Teguh Kurniawan

Institutions
Universitas Sultan Ageng Tirtayasa

Abstract
The aim of this study is to characterize Bayah natural zeolites and tested for ammonium capture. Characterization of Bayah natural zeolites were performed by X-ray diffraction (XRD), scanning electron microscope (SEM), and nitrogen physisorption. The natural zeolites were identified as mordenite and clinoptilolite. Non-zeolitic phase appeared on the XRD pattern was quartz. The morphology of clinoptilolite and mordenite were observed as platy and needle shape in the SEM images, respectively. Major cations were K+ and Ca2+ which were determined by energy dispersive X-ray. Nitrogen isotherm physisorption suggested that the natural zeolites was typical of type IV isotherm. Pore size distribution were determined using Barrett, Joyner, and Halenda model with mesopore size 3-5 nm. Ammonium exchange on Bayah natural zeolites were conducted in a batch experiment by varying the particle sizes, time and mass loading. Non-linear least squared method was applied to fit the experimental data with various kinetic and isotherm models. The kinetic data was well fitted with the Elovich equation with error 1.6 x 10-4. Isotherm adsorption of ammonium followed Langmuir-Vageler with error 4 x 10-2

Keywords
natural zeolites, ammonium exchange, kinetic study, isotherm

Topic
Chemical Engineering

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

Corresponding Author
MUHARAM KEMAL ADAM

Institutions
a) Department of Metallurgical and Materials Engineering, Faculty of Engineering, Universitas Indonesia, Kampus UI, Depok, Indonesia 16424
*anne[at]metal.ui.ac.id

Abstract
Characterization of AC4B/Nano TiC Composite With Volume Fraction Variation of Nano TiC Reinforce by Stir Casting Process has been investigated. Author used aluminium alloy series three, AC4B, which contain silicon and copper as its main alloy. Furthermore, the addition of Nano TiC into AC4B composite can increase the tensile strength, ductility, and toughness of AC4B composite by refining the dendrite structure of the α-Al phase and forming super saturated solid phase, θ (Al2Cu). This research opens the opportunities of aluminum composite material to be used in arms industry, such as bulletproof material. In this study, AC4B/Nano TiC composite were made through stir casting with some variable parameters of Nano TiC reinforce composition of 0.25%, 0.3%, 0.35%, 0.4%, and 0.5% volume fraction to determine the optimum value of the mechanical properties of AC4B/Nano TiC composite. Stir casting process was chosen because it has several advantages, such as easy to use, flexible, and can be used to produce a large number of the products. It is known that AC4B/Nano TiC composite has optimum value of the mechanical properties when Nano TiC composition is 0,3% volume fraction with ultimate tensile strength of 132,31 MPa and the hardness of 55,18 HRB.

Keywords
AC4B Composite; Nano TiC; Stir Casting

Topic
Materials Science

Link: https://ifory.id/abstract/HEP7Utzrh9vu

Corresponding Author
Kusdianto Kusdianto

Institutions
Department of Chemical Engineering, Institut Teknologi Sepuluh Nopember, Sukolilo, Kampus ITS Sukolilo, Surabaya, Indonesia 60111

*Email: swinardi[at]chem-eng.its.ac.id

Abstract
Flame pyrolysis is widely used for fabrication of nanoparticles due to high crystallinity and narrow size distribution of the products. In this study, ZnO-Ag nanocomposite materials have been successfully fabricated by a flame pyrolysis. The effects of Ag loading ranging from 0 to 20 wt% in the ZnO-Ag nanocomposites on the photocatalytic activity under UV and sunlight irradiations were also studied. ZnO and Ag nanoparticles were synthesized based on zinc acetate dihydrate 0.1 M and silver nitrate inside a flame reactor. Morphologies and crystallinity of ZnO-Ag nanoparticles were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). SEM analysis showed that nanoparticles have irregular sphere-like shapes. The XRD patterns indicated that the produced ZnO had a wurtzite structure with varying crystallite sizes. XRD analysis also confirmed the existence of Ag nanoparticles in ZnO-Ag nanocomposites when the concentration of Ag as much as 5 wt% indicated by the appearance of XRD peak at 38.1º. The peak at 38.1º increased with the increase of Ag content. Finally, the photocatalytic activity was evaluated by measuring the degradation of methylene blue aqueous solution under UV and sunlight irradiations. It showed that the best photocatalytic performance was obtained at 5 wt% Ag content for both irradiations.

Keywords
Ag content, Characterizations, Photocatalytic Activity, ZnO/Ag

Topic
Chemical Engineering

Link: https://ifory.id/abstract/b9ryV2tGnZjq

Corresponding Author
Rama Indera Kusuma

Institutions
Departement of Civil Engineering, UNTIRTA,Indonesia

Abstract
Clay is a type of soil with high pore water characteristics which causes its problem for pavment. Ujung Kulon national Park road in Sumur Subdistrict, Pandeglang Regency is a road with clay soil type, so the road is often demaged. To overcome this its problem it is necessary to add strength and improve its bearing capacity. One of the way is by doing a method of Stabilitation on the soil in that location. The addition fly ash and carbide waste is one of the effective ways to stabilize clay soil, since fly ash and carbide waste have properties that are able to bind the soil to solid and increase the value of the soil strength. The research aims to determine the classification of soil, soil plasticity index, and find out the effect of adding fly ash and carbide waste to the soil physical properties, as well as to find out the value of the soil compression strength in existing condition and after mixing fly ash and carbide waste.The water content of the sample taken from the compaction of the original soil standart proctor. The variation of fly ash mixture that used is 0% and 20% and carbide waste with a mixture of 0%, 5%, 10%, 15%, 20% and 25%. Based on the result, the soil which stabilized by fly ash and carbide waste in the variation of 0%, 10%, 15%, and 20% showed the increase of the value of the soil bearing capacity, and decrease the velue of soil plasticity index.the largest of UCT (Unconfined Compression Ssrenght) value result for soil sample mixed with 20% fly ash and 20% carbide waste contain by curing for 28 days in amount of 5,51 kg /cm2. Curing effect on the compressive strength for fly ash has pozzolanic properties that is like cement takes time to strengthen binding and carbide waste has the cemichal compound needed by clay in the particle binding process.

Keywords
fly ash, carbide waste, stabilization, compaction, UCT, soil physical properties

Topic
Civil Engineering

Link: https://ifory.id/abstract/9vzR86kC2xeh

Corresponding Author
Sahr Fillie

Institutions
a) Department of Industrial Engineering,Faculty of Industrial Technology, Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia
* sahrfill[at]gmail.com
b) Department of Industrial Engineering, Institut Teknologi Sepuluh Nopember, 60111, Surabaya, Indonesia

Abstract
A supply chain (SC) is a whole set of activities involved in taking and managing a product or products from the point of production to the point of consumption. Between these extremes, there are many activities ranging from simple to complex that are carried out to satisfy the consumption side in meeting their varied demands and the production end in increasing performance in its entirety. These activities can either be functional or operational or both. To enhance the smooth transition, healthy collaborative initiatives are important. This research seeks to evaluate the meaningful contributions of collaborative inventory management for seasonal products with demand uncertainties having a single order in a cycle through newsvendor and buyback contract for the mutual benefits of a two-tier SC. If these uncertainties are not properly managed, they will adversely affect the players of the SC. To mitigate these negative effects, a Monte Carlo simulation model was used to optimize the decision variable to improve the performance of the SC and at the same time meeting service level. The results indicate that the efficient and collaborative management of these products through buyback contract could potentially improve the entire SC significantly.

Keywords
supply chain; collaborative inventory management; seasonal products; demand uncertainties; simulation; buyback contract

Topic
Industrial Engineering

Link: https://ifory.id/abstract/VEwvN3LPfQpb

Corresponding Author
Anantya Novega Santoso

Institutions
Universitas Indonesia

Abstract
Increased population and economic capacity of the community indirectly affects the amount of household waste produced by the community. Unfortunately, this is not accompanied by good waste management from the community level. Management of household waste at the community level can be done by sorting waste. The habit of people to dispose of garbage without sorting can be a problem in implementing 3R activities (Recycling, Reducing, Reusing). The purpose of this study is to find out what factors influence the community in sorting household waste. This research is based on the Theory of Planning Behavior (TPB) which considers several factors such as attitudes, subjective norms, and behavioral controls to influence someone to make intentions in behavior and expand the TPB conceptual model to overcome gaps. The results of this study came from a survey with 301 respondents in two locations namely DKI Jakarta and Depok. The results of this study indicate that attitudinal factors have the most significant influence on the intention and behavior of sorting garbage. While other factors such as demographics, subjective norms and perceptions of behavioral control do not have a significant effect.

Keywords
Waste Separation; Theory of Planned Behavior (TPB); Partial Least Square (PLS)

Topic
Industrial Engineering

Link: https://ifory.id/abstract/DRUNagde8W7u

Corresponding Author
Cakra Adipura Wicaksana

Institutions
Universitas Sultan Ageng Tirtayasa
Universitas Muhammadiyah Bandung

Abstract
Electrocardiogram (ECG) signal is one of importance signal from our body that sourced from heart. There are many benefits that can be obtained from ecg signals, for example can determine whether sleepy or not, whether stress or not, and several diseasses like arrhytmia, hypertension, heart failure, etc. In this research, we proposed module for extraction feature for ecg signal to Heart Rate Variability (HRV) parameters using GPU Acceleration. The output can be used for further analytics or another module, but in this research only emphasis on QRS detection and peak detection from ecg signal. The input will be ecg Signals and the output will be array of peak in every row. There have been various research trying to extract or detect QRS and peak based on Pan-Tomkins Algorithm, but this research will make use python and will compare the acceleration using some library. The flow comprise five main step, (1) load ecg signal, (2) filtered ecg, (3) derivative from filtered ecg, (4) squaring from derivative ecg, (5) convolution squaring ecg, and (6) peak detection using Fiducial Mark. The output will list of array that contain mark for every peak in every ecg signal. The overall module has been succesfully implemented and compared in python. The result show that computation using numpy is still better and faster for small array data. The Output of peak of array can be used to the next module.

Keywords
ecg, hrv, feature extraction, gpu, qrs, peak detection, pan-tomkins

Topic
Computer Engineering

Link: https://ifory.id/abstract/Ba8dV2KuZGjX

Corresponding Author
Agus Pramono

Institutions
Department of Metallurgy, Faculty of Engineering, University of Sultan Ageng Tirtayasa. Jl. Jend Sudirman km. 3 Cilegon Banten 42435 Indonesia

Department of Production Management, Faculty of Mechanical Engineering, Polytechnic University of Tirana, Mother Teresa No.4 1001 Tirana, Albania

Abstract
The technology of severe plastic deformation (SPD) is process on forming metals of large plastic strain used for mass production in order to make ultrafined-grained (UFG). There are several methods used in this SPD technology, namely multi-axial forging (MAF), equal channel angular pressing-parallel channel (ECAP-PC)/accumulative press bonding (APB) and repetitive press roll forming (RPRF), various methods are potentially applied in the industrial world because they are more effective and efficient compared to conventional methods. Through research on the characterization of aluminum-based composite materials with several SPD methods, the ideal variable will be obtained in producing high-strength materials. The development of a new SPD method driven by requirements simplifies the process, so that it can be applied to mass production, some of the development of SPD technology is able to produce high plastic strain. The market for nanostructured materials produced by SPD technology is in sectors where superior traits, such as specific strength or increased fatigue age, are needed by analysis of market application. Formal market analysis in nanostructured metals, carried out by Metallicum, has found more than 100 specific markets for nano metals in space, transportation, medical equipment, chemical processing, electronics, and defense. However, due to the still high operational costs, the application of nanotechnology is still limited to military equipment applications. This research is a comparison of several SPD methods (MAF, ECAP-PC/APB and RPRF) in the scope of advanced manufacture forming fabrication to utilize multi pressing applied to aluminum alloys and aluminum-based composites to produce material properties needed by armor material for defense equipment applications.

Keywords
Severe Plastic Deformation, Aluminum, composite based and ultra-fined grained

Topic
Mechanical Engineering

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

Corresponding Author
Wayan Widhiada

Institutions
University of Udayana

Abstract
Abstract The development of prosthetic limbs in Indonesia is still conventional. Users still have difficulty to move fake legs and spend a lot of energy. These problems can be reduced by using the robotic prosthetic limbs. Bionic robot leg movements can be regulated by the implementation of a control system on the Microcontrolle. The auto tuning parameters of PID control system design is using to achieve the optimal of the responses. Beside that this research is also using the intelligence control system that is Fuzzy Logic makes it easy to create a motion control system program from a dc motor mounted on the robotic foot joint. The purpose of this study is to compare the results of the performance of the use of PID control systems and fuzzy controls. The bionic robot leg control system produce the optimal motions, accurate movement and fast response by reducing signal errors, maximum overshoot, and faster settle time.

Keywords
Bionic robot leg, PID, Fuzzy Logic, Intelligent Control, Performance of motions

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/bH4qWg3AatDN

Corresponding Author
Zulmahdi Darwis

Institutions
Universitas Sultan Ageng Tirtayasa

Abstract
Structure failures often happen whether caused by bad planning or implementation, especially at a reinforced concrete bar. Failures on building structure elements might be caused by several factors such as planned age of use, transformation on building function, and even improper construction procedure or method. Thus, the reinforced concrete bar strengthening is required especially on a 10 m bar. This study focus is comparison on strengthening the original structure of the building using the CFRP method which overlaying the bar surface, adding the IWF bar as a cantilever from below of the desired structure, and enlarging the bar dimensions. The result of the study shows that using 5 m2 CFRP overlayed on flexible reinforcement and 2.5 m2 CFRP overlayed in shear reinforcement results in Mn = 207.82 Knm and Vn = 146.33 Kn. Furthermore, additional 400,400,13,31 IWF bar for the strengthening result in Mn = 1045,32 Knm and Vn = 809,79 Kn. Finally, the dimension enlargement to 650 mm x 350 mm of 4D16 reinforced concrete and P10-250 mm reinforced cross-bar result in Mn = 529,23 Knm and Vn = 78,56 Kn. Effectiveness analysis is done to select the most effective method considering its strength gained and the cost required.

Keywords
Concrete Bar, CFRP, IWF Steel, Dimension Addition

Topic
Civil Engineering

Link: https://ifory.id/abstract/Mngx2qavYwZu

Corresponding Author
Samuel Henrina Sundjaja

Institutions
a. Civil Engineering Department, Faculty of Engineering, Universitas Indonesia, Jalan Margonda Raya, Pondok Cina, Beji, Kota Depok, Jawa Barat 16424, Indonesia

Abstract
Estimating axial capacity of piles using Direct Method is still considered as a challenge these days. Estimation mainly achieved after construction is done and field method such as Static Load Test or PDA are used for calculating axial capacity of piles in real field conditions. This paper discussed estimation from 8 building project cases from Jakarta and Depok that have complete Standard Penetration Test data and field calculations (Static Load Test & PDA). The main objectives are to observe and correlate the results between every Direct Methods and field methods and to obtain which Direct Method is the most efficient to use for estimating axial capacity of piles in Jakarta area. Direct Methods that are used are Meyerhoff, Shariatmadari, Decourt, Aoki, and Robert. Calculation results showed that the most efficient standard penetration test method is that proposed by Decourt with average result of comparison between estimated axial capacity of piles and field calculation is roughly 1.03. The most underpredicted between every standard penetration test method is the one proposed by Aoki de Alencar with roughly 92% underprediction ratios and the most largest overpredicted method is proposed by Shariatmadari with roughly ratios of 56%.

Keywords
Standard Penetration Test; Axial Capacity; Direct Method; Field Calculations

Topic
Civil Engineering

Link: https://ifory.id/abstract/64e9bjfYRgE7

Corresponding Author
Arif Prasetya Kurniawan

Institutions
(a) Department of Mechanical Engineering, Universitas Muhammadiyah Surakarta
Jl. Ahmad Yani Tromol Pos 1, Pabelan. Kartasura, Sukoharjo
*d200150006[at]student.ums.ac.id

(b) Department of Chemical Engineering, Universitas Muhammadiyah Surakarta
Jl. Ahmad Yani Tromol Pos 1, Pabelan. Kartasura, Sukoharjo

Abstract
The amount of agricultural waste that is underutilized and plastic waste thrown away is one of the factors of environmental pollution that is difficult to overcome. Even if you can use it well, agricultural waste and plastic waste can have economic value. This study aims to determine the impact strength of hybrid composites by utilizing corn husk waste, banana midrib waste and Polyethylene Telephthalate plastic waste as plasterboard. The way to make it is corn husk fiber and banana midrib fiber until it becomes powder, then the fiber is sieved with a 50 mesh sieve. While plastic waste is chopped to small. Furthermore, corn husk fiber powder, banana midrib fiber powder and plastic powder are mixed using epoxy resin and then cold pressed for 10 hours. Data is collected by means of testing tensile strength. From the results of the study it can be concluded that corn husk fiber, banana midrib fiber and Polyethylene Telephthalate plastic can be used as a mixture of environmentally friendly waterproof plasterboard making. In further development, these composites not only can be used as plasterboard, but can be used as house doors, study tables, room walls, ironing boards, canopies, sound absorbers, etc.

Keywords
corn skin fiber, banana skin fiber, PET plastic, composite hybrid, epoxy resin

Topic
Mechanical Engineering

Link: https://ifory.id/abstract/nBkQw6JxPXve