bluuebunny/crossref_metadata_2025 huggingface dataset:
Miniature temperature sensor based on encapsulated silica microfibre–microsphere structure
Authors: Dang Hongtao , Li Jin , Xin Duqiang , Liu Wei
Published: September 2018

Either microfibres or microspheres with different diameters were prepared from standard single‐mode fibres with heating–stretching method. The influence of the different diameters of microspheres (from −49.4 to −208.04 μm) on the transmission spectra of silica microfibre with a diameter of −3 μm was studied through the whispering gallery modes. In addition, the temperature sensing characteristic of this microfibre–microsphere system was demonstrated with a sensitivity of −12.66 pm/°C in the interval of 30.18–38.52°C. Due to its simple, costless and miniature fabrication process, this microfibre–microsphere system will be the promising candidate for novel photonic devices and bio‐chemical sensors.
Characterisation and investigation of antibacterial properties of nylon 66/TPS/Ag NPs nanofibre membranes
Authors: Allafchian Alireza , Jalali Seyed Amir Hossein , Kabirzadeh Navida
Published: September 2018

Electrospinning method was used to prepare nylon 66 nanofibre membranes in solution mixed with chloroform/formic acid. These nanofibres were covered with (3‐mercaptopropyl) trimethoxysilane (TPS) that has a sulphur group, making it a suitable host for Ag nanoparticles (Ag NPs). Spraying of the as‐prepared nylon 66/TPS surface first with silver nitrate solution and then scattering with a mixture of N2H4/NaBH4 used as reducing agents during the second process provides nanofibres with nylon 66/TPS/Ag NPs structure. Characterisation of the formed nanofibres was studied by Fourier transform infrared, scanning electron microscopy, X‐ray diffraction and transmission electron microscopy techniques. The non‐woven polyurethane coated with activated carbon particles and polyethylene mesh was utilised as the substrate and protective layers of as‐prepared nanofibres, respectively. Finally, the antibacterial activity of nanofibre membranes against gram‐positive and gram‐negative bacteria was investigated by using the disk diffusion method and it was shown that the newly synthesised nanofibres presented very good antibacterial activity against the tested bacteria. The results of this study can be used for industrial applications such as antibacterial wound dressings or/and water disinfection filters.
Photometric variability of massive young stellar objects
Authors: Teixeira G. D. C. , Kumar M. S. N. , Smith L. , Lucas P. W. , Morris C. , Borissova J. , Monteiro M. J. P. F. G. , Caratti o Garatti A. , Contreras Peña C. , Froebrich D. , Gameiro J. F.
Published: September 2018

The Vista Variables in the Via Lactea (VVV) survey has allowed for an unprecedented number of multi-epoch observations of the southern Galactic plane. In a recent paper, 13 massive young stellar objects (MYSOs) have already been identified within the highly variable (ΔKs > 1 mag) YSO sample of another published work. This study aims to understand the general nature of variability in MYSOs. Here we present the first systematic study of variability in a large sample of candidate MYSOs. We examined the data for variability of the putative driving sources of all known Spitzer extended green objects (EGOs; 270) and bright 24 μm sources coinciding with the peak of 870 μm detected ATLASGAL clumps (448), a total of 718 targets. Of these, 190 point sources (139 EGOs and 51 non-EGOs) displayed variability (IQR > 0.05, ΔKs > 0.15 mag). 111 and 79 light-curves were classified as periodic and aperiodic respectively. Light-curves have been sub-classified into eruptive, dipper, fader, short-term-variable and long-period-variable-YSO categories. Lomb-Scargle periodogram analysis of periodic light-curves was carried out. 1–870 μm spectral energy distributions of all the variable sources were fitted with YSO models to obtain the representative properties of the variable sources. 41% of the variable sources are represented by > 4 M⊙ objects, and only 6% were modelled as > 8 M⊙ objects. The highest-mass objects are mostly non-EGOs, and deeply embedded, as indicated by nearly twice the extinction when compared with EGO sources. By placing them on the HR diagram we show that most of the lower mass, EGO type objects are concentrated on the putative birth-line position, while the luminous non-EGO type objects group around the zero-age-main-sequence track. Some of the most luminous far infrared (FIR) sources in the massive clumps and infrared quiet driving sources of EGOs have been missed out by this study owing to an uniform sample selection method. A high rate of detectable variability in EGO targets (139 out of 153 searched) implies that near-infrared variability in MYSOs is closely linked to the accretion phenomenon and outflow activity.
The kumjian-pask algebras of finite finitely aligned k-graphs without cycle as modules
Authors: Gozali Sumanang , Rosjanuardi Rizky , Yusnitha Isnie
Published: September 2018

In general, every algebra can be viewed as a module over itself. In this paper, we analyze the structure of Kumjian-Pask algebras of finite finitely aligned k-graph without cycles via module theory.
Heat transfer problem analysis in three dimension tromol brake system problem
Authors: Tulus Tulus , Sudirman Sudirman , Sinulingga U. , Marpaung T.J.
Published: September 2018

One of the physical problems that can be found in heat transfer is heat transfer to a vehicle brake. In this study a focused vehicle is a motorcycle. Where the heat transfer of the brake system on the motorcycle in this study was completed finite element method. The purpose of this study is to analyse one of the problems of displacement in the three dimensions of the motorcycle brake. So, the results obtained in the form of the best time in the braking for motorcycles. The settlement method is to use one of the partial differential equations for heat transfer. One of them is the Elemenisation model is the braking system. As is known braking system is a system used to slow and stop the vehicle. During the braking phase, the vehicle's kinetic energy will be converted into heat energy due to the friction action of the brake system. The heat flux produced by effects to the brake lining is ideally dissipated into the environment to avoid brake friction pad emissions. The heat produced has a tendency to evaporate the brake fluid and the disc brake surfaces will become hot. Based on the results obtained, when the braking system is in operation, the most significant heat transfer in t = 3.8s. This time is the best time to avoid excessive brake fluid evaporation and the rapid breakdown of the brake surface due to excessive heat.
Simulation of granular in two dimensions: The effect of particle velocity on rigid wall boundary
Authors: Muliyati Dewi , Firdaus Bagaskara , Ambarwulan Diah , Fitriani Ella , Siswoyo Siswoyo , Bakri Fauzi , Permana Handjoko
Published: September 2018

The various setting of granular systems becomes an interesting and important thing to learn another granular-like system. Each system can represent different physical meaning. In this work, we perform two dimensions simulations of granular on the rigid wall. The varying initial velocities generate for each particle. We used two sets of the rigid wall, straight and inclined wall. The interaction of particle-particle and wall-particles used frictionless rigid body interaction. From the simulation result, observed that the small increment of a given velocity affected the reached maximum height particle as rapidly. The inclined wall indicates the less number of particles that pass through the wall. Future work can implement these results such as on granular energy damping.
Optimal tube diameter on heat exchanger shell and tube type with 15 mega watt thermal power using fluent 6.3
Authors: Nurhasanah Siti , Subekti Muhammad , Subkhi Moch. Nurul , Nuryadin Bebeh Wahid
Published: September 2018

Heat exchanger shell and tube type is a set of tools that serve to move the heat from the side shell (hot fluid) to the tube (cold fluid). RSG-GAS Heat Exchangers is a heat exchanger shell and tube type 2-2. Since the age of Heat Exchanger operation long enough allow for new designs of heat transfer better. This is one reason the presence of micro modeling using Computational Fluid Dynamics (CFD), as one of them using the software FLUENT 6.3. Tube and shell modeled in GAMBIT with the variation ID (inner diameter) tube. As for the physical data such as flow rate, pressure, and temperature refers to the RSG-GAS Heat Exchangers. The first variation is the different mesh sizes for the tube that has the same diameter. Mesh size of 0.8 mm had the best result so do the meshing used as a benchmark for other models. Variations of 2D models use inner diameter from 20 mm until 26m. From CFD calculations using FLUENT 6.3 for 2D models, in the can that ID 20 mm, 23 mm and 26 mm can be used as models for 3D calculations. Of 3D calculations it can be concluded that the tube with an ID of 26 mm have the most optimal heat transfer is equal to 273,24669 K with a pressure drop of 450 Pa.
Effect of nanostructure Ni on the sorption properties of mechanical milled MgH2 for solid hydrogen storage materials
Authors: Jalil Zulkarnain , Rahwanto Adi , Handoko Erfan
Published: September 2018

Among the metal hydrides, magnesium has the theoretically highest weight capacity for hydrogen storage (7.6wt.%), lightweight and a reasonably low cost. However, high working temperature (<300°C), slow reaction kinetics (need more than 1 hour to produce 5 wt% of hydrogen) and difficult activation limit the practical application of Mg-based hydrides. In order to improve their performance, MgH2 was catalyzed with Ni nanoparticles which reactively milled under hydrogen atmosphere. Phase identification and microstructure were characterised by XRD and scanning electron microscope (SEM). Hydrogen sorption properties was studied by gravimetric analysis method. The results show that, small amount of Ni in nanometer scale proved to be as a suitable catalyst for improvement the kinetics of MgH2 and at the same time allowed to reduce the milling time process.
Discretization method to optimize logistic regression on classification of student’s cognitive domain
Authors: Yamasari Yuni , Rusimamto Puput W. , Rochmawati Naim , Suyatno Dwi F. , Wibawa Setya C. , Nugroho Supeno M. S. , Purnomo Mauridhi H.
Published: September 2018

The accuracy level of the student determination in a class often has been paid less attention in educational data mining. So, this paper studies how to improve the performance of classification method to reach the higher of level accuracy. Therefore, we optimize logistic regression using equal frequency discretization method. Here, we test the student data by three intervals, four intervals, and five intervals. For logistic regression, we implement two regularization types, namely: lasso, ridge. Furthermore, to evaluate the results, we use the random sampling technique. Additionally, we measure the results by four classifier metrics, namely: F1, precision, accuracy, and recall. The experimental result shows that this method can be applied to optimize the logistic regression. On logistic regression_lasso and logistic regression_ridge, the three intervals achieve the highest of accuracy level. They can improve the accuracy level about 9% - 9.4%, respectively.
Design of decision support system for santri admission
Authors: Syaripuddin Undang , Slamet Cepy , Prabowo Hendri , Ramdhani Muhammad Ali
Published: September 2018

Pesantren requires some new qualified students through selection process for deciding academic and behavioural fairness. In this context, it is reasonable to utilize an application of a Decision Support System (DSS) to accelerate the student admission mechanisms since the existing process is unable to serve as reliable and objective procedures. The aim of this study is to design a specific computerized application that can be used to capture data of some potential students and recording relevant data for pesantren. Using a structured approach for the system design method, selection-based value is analysed by a Multi Attribute Utility Theory. The study is resulting a capable DSS application to identify students who have proper criteria and build a measurable data documentation.
Enhanced pixel value differencing with cryptography algorithm
Authors: Rahim Robbi , Kurniasih Nuning , Handayanna Frisma , Sari Dewi Linda , Sihombing Erene Gernaria , Arisawati Ester , Rinawati R , Windarto Agus Perdana , Ambarsari Erlin Windia , Sriadhi S , Sulistiyowati Indah
Published: September 2018

The combination of Steganography and cryptography algorithms can improve the security of data you want to keep secret. Pixel Value Differencing (PVD) algorithm combined with Word Auto Key Encryption (WAKE) algorithm and Modular Multiplication Block Cipher algorithm can produce good ciphertext and inserted on image media by using PVD algorithm that convert each ciphertext into pixel.
Structure and electrical properties of polymer electrolyte membrane for fuel cell application
Authors: Yusmaniar Yusmaniar , Afrizal Afrizal , Nurzaman Nurzaman , Handoko Erfan
Published: September 2018

In this study to investigate the Polymer Electrolyte Membrane or Proton Exchange Membrane (PEM) that were synthesized by using acrilonitrile butadiene styrene (ABS). In order to enhance ability as a proton conductive polymer membrane as electrolyte, amorphous and crystalline silica ( 3 % and 5 %) were added to the initial mixture of ABS to inhibit relatively high proton conductivity. The structural and morphological characterization of samples was done by X-ray powder diffractometer, FTIR and scanning electron microscopy. Electrical properties were determined by LCR-meter (HIOKI 3522-50LCR HiTESTER). The structure analysis shows that the ABS amorphous phase with the unsmoth surface. The electrical conductivity of Polymer Electrolyte Membrane is 4,21 x10-3 S/cm of ABS with 5 % amorphous silica.
Deformation profile of a piece of japonica cooked rice with squeezing test
Authors: Efrina Efrina , Komoda Yoshiyuki , Suzuki Hiroshi , Hidema Ruri
Published: September 2018

The texture of cooked rice plays an important role in the characteristics of cooked rice. It can be firmness or stickiness depends on the amount of amylopectin inside the cooked rice, the higher the content will be more stickiness. Japonica rice is the type of rice with highest amylopectin content. Therefore the texture is the most stickiness. This research is to define the stickiness of japonica cooked rice using stress-strain behavior through uniaxial compression test. Stress defined as a normal force divided by a cross-sectional area in the horizontal plane while strain as a shrinking ratio of cooked rice. A single Japonica cooked rice squeezed using parallel plate type rheometer with constant velocity (0,2; 0,5; 1; 2; 4 mm/s). The deformation process of cooked rice was recorded from both side and bottom views to measure area transformation. The result showed that stress-strain of the deformation of cooked japonica rice was strongly depended on velocity. The low velocity (0,2;0,5;1 and 1 mm/s) are same with high velocity (2 and 4 mm/s) the during first deformation but significantly different statistically in the later deformation.
Ethanol of ajwa
Authors: Rodliyana M. Dede , Rahmatullah Saepudin , Gojali Dudang , Ismail Ecep , Apipah Risma Nur
Published: September 2018

Dates ajwa is a special fruit. One of the obvious advantages listed in the hadith of Rasulullah SAW. In addition, the glucose content is very high, thus potentially producing ethanol after fermentation. Self-explanatory calendar searches as ethanol producers have not been reported, so they need to be explored. This study traces ethanol to fermented dates with hydrolysis and without hydrolysis. The results showed that the volume of ethanol produced by hydrolysis was larger, ie 15.5 mL/day, compared without hydrolysis, ie as much as 6.5 mL/day. In the flame test, the fermentation results with hydrolysis longer lit than without hydrolysis. The benefits of the study provide information that dates as well as rizki ajwa, also can produce intoxicating substances.
The potential of tropical grass as a feed in ruminant by using an in vitro gas production
Authors: Asikin Nevyani , Jayanegara Anuraga , Ridla Muhamad , Samsudin Anjas Asmara
Published: September 2018

Pennisetum purpoides is one of the most widely cultivated tropical forages and it is often used as animal feed in Indonesia. However, grass feeding could not fulfill the need of nutrients if served as single feed because it contained of high crude fiber and low protein. In terms of nutritional adequacy, animal feed should contain complete nutritional value in order to achieve an optimum productivity. This experiment aimed to elucidate the potential of tropical grass as a feed in ruminant by using an in vitro gas production technicque. The grasses were determined for proximate analysis, Van Soest fiber fractions (neutral detergent fiber, acid detergent fiber and acid detergent lignin), and in vitro rumen fermentation parameters. This study was conducted from January until April 2018 at Nutrition Laboratory, Department of Animal Science, Faculty of Agriculture, University Putra Malaysia, Serdang Selangor Darul Ehsan, Malaysia. This study used a randomized block design with 3 replications. There were three treatments tested in this study, i.e. (1) Pennisetum purpoides (T1), (2) Setaria splendida (T2), (3) Setaria anceps (T3). Parameters measured in the in vitro study is total gas production. Data were tested using analysis of variance (ANOVA) and continued with Duncan test if there was a significant difference among treatments. The data showed that gas production is not significantly different (P>0,05).
Statin and anemia in chronic kidney disease (CKD): an experimental study
Authors: Cahyawati P N , Aryastuti A A S A , Ariawan M B T , Arfian N , Ngatidjan Ngatidjan
Published: September 2018

Anemia is a common feature of chronic kidney disease (CKD). The current management of patients with anemia in CKD is controversial. These make anemia is one of the leading causes poor outcome in CKD patients. Our study focus to assess the effect of statin on hemoglobin level with an experimental model of CKD. We perform the animal model of CKD by subtotal nephrectomy procedure. A total of 20 male swiss was used in these study. All the animal divided into 4 groups: sham group (S), nephrectomy (Nx), simvastatin group 5 mg/kgBB (SV5), and simvastatin group 10 mg/kgBB (SV10). Hematological parameters (hemoglobin (Hb), white blood cells (WBC), red blood cell (RBC), hematocrit (HCT), mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH), mean corpuscular hemoglobin concentration (MCHC)), and serum creatinine are measured at the end of the study. The hemoglobin levels in the Ux group decreased significantly compared with the S group (11.02 ± 0.46 vs 14.3 ± 0.15, p<0.0001). While in the SV group, statin administration led to an increase in hemoglobin levels compared with the Ux group but not statistically significant (SV5: 13.26±0.34; Sv10: 12.68±0.26). These results suggest that administration of statins in CKD may improve the condition of anemia by an unknown mechanism, while still requiring other treatment options to maximize the effect of therapy.
Analysis of flame stabilization limit in a cylindrical of step micro-combustor with different material through the numerical simulation
Authors: Saputro Herman , Purwanto Aris , Fitriana Laila , Wijayanto Danar S , Sutrisno Valiant L P , Ariyanto Eka D , Bima Marshal , Pratama Yuda , Juwantono Heri , Firdani Tutuko , Muslim Riyadi , Munir Fudhail A
Published: September 2018

The flame stabilization limit on micro-combustor had studied to support the micro power generator system. Micro-combustion became the crucial components in a micro power generation system as heat resource that will be converted into electricity. However, the unstable flame in micro-combustor became the main problem that faced by researchers, especially the excess of heat losses. The objective of this study is to observe the flame stabilization limit in a rearward facing step micro-combustor. This study was focused on the effect of micro-combustor material and flame stabilization through the numerical simulation. The micro-combustor material that was used in this study is quartz glass and stainless steel. Micro-combustor was divided into unburned region and burned region. The dimensions of micro-combustor are 3.5 mm inner diameter of unburned region, 4.5 mm inner diameter of burned region and 1 mm thickness. The results have shown that the material of micro-combustor and model of the flame holder have direct relationship with the characteristics of flame stabilization in the micro-combustors. The effects of the flame holder designs and micro-combustors dimensions on the flame stabilization were discussed in detail in this paper.
Numerical simulation of flame stabilization in meso-scale vortex combustion
Authors: Saputro Herman , Juwantono Heri , Bugis Husin , Wijayanto Danar Susilo , Fitriana Laila , Perdana Valiant Lukad , Purwanto Aris , Arianto Eka Dwi , Bima Marshal , Pratama Yudha , Muslim Riyadi , Firdani Tutuko
Published: September 2018

A meso-scale vortex combustor has been designed in order to common flame quenching problems in meso/micro scale burning. Numerical simulations using Computational Fluid Dynamic (CFD) Ansys Release 19.0 Academic program was performed to determine a stable combustion flame. Combustor chamber made from two steps, first step diameter 6 mm with 4 mm depth, second step diameter size 8mm with 5 mm depth. This simulation used mixture of propane fuel-air. The fuel is fed through two channels of fuel inlet with 2 mm diameter. The variable of fuel flow rate was investigated in order to get the boundary of extinction limit and blow off limit of flame (stable flame region). The results show that the flame stable limit by using meso-scale vortex combustor more widely than other types of micro combustor. Therefore, the meso-scale vortex combustor that was developed could be used to overcome the flame quenching problems.
Measurement of pressure wave speed in stainless-steel pipe generated by water hammer
Authors: Nurprasetio Ignatius Pulung , Budiman Bentang Arief , Triawan Farid , Hafid Muhammad
Published: September 2018

This paper aims to demonstrate a measurement method of pressure wave speed in stainless-steel pipe filled with water caused by water hammer phenomenon. The pressure wave is generated using a self-developed drop impact testing equipment. An impactor is dropped to collide a buffer which then induces the water hammer phenomenon. The generated pressure and its propagation speed in the water are carefully measured here. Pressure measurement is conducted by a pressure transducer, while pressure wave speed is measured by two methods, which utilize peak time of the pressure recorded by pressure transducer and peak time of strains recorded by two strain gages positioned in a different location. These strain gages are oriented to the circumferential direction of the pipe. Measurement result shows that at 1.5 m height, impact pressure of between 0.86 to 1.16 MPa and wave velocity of 1250 m/s were obtained. From the experimental results, the characteristic of pressure wave in the water was able to be observed.
The classification of arabica gayo wine coffee using UV-visible spectroscopy and PCA-DA method
Authors: Suhandy Diding , Yulia Meinilwita
Published: September 2018

The unique processing of Arabica Gayo Wine coffee produces special attributes to the beverage and could increase its value. However, it is important to prove the authenticity of Arabica Gayo Wine coffee using reliable methods. The objective of this study was to evaluate the potential of UV-visible spectroscopy and principal component analysis-discriminant analysis (PCA-DA) method for classification of ground roasted Arabica Gayo Wine coffee. A number of 200 samples of Arabica Gayo Wine coffee and 200 samples of Arabica Gayo normal (not Wine) coffee was used. The spectral data obtained in the UV-visible region were analyzed using PCA-DA with standard normal variate (SNV) and followed by Savitzky-Golay smoothing with different number of smoothing point (NSP). The results showed that the best PCA-DA model was obtained with NSP = 23 with coefficient of determination for calibration (R2) = 0.99, root mean square error of calibration (RMSEC) = 0.005692 and root mean square error of validation (RMSEV) = 0.006112. Using this model, a good classification between Gayo Wine and Gayo normal in prediction step was achieved with 100% accuracy, sensitivity and specificity. Thus, the proposed method can be used for the evaluation of authenticity of ground roasted Arabica Gayo Wine coffee.
Kinetics study on non-isothermal thermochemical liquefaction of corncobs in ethanol-water solution: Effect of ethanol concentration
Authors: Sembodo Bregas Siswahjono Tatag , Sulistyo Hary , Sediawan Wahyudi Budi , Fahrurrozi Mohammad
Published: September 2018

Corncobs are potentially processed into bio-oil through thermochemical liquefaction processes. It is difficult to construct kinetics models based on the compounds involved in the reaction. It would be made four kinetic models based on four reaction products, i.e., solids, bio-oil, gas and volatile products. The purposes of the study were to seek kinetics model of thermochemical liquefaction of corncobs in ethanol-water solution and to study the effect of ethanol concentration. The experiment of liquefaction processes of corncobs in ethanol-water solution using sodium carbonate catalyst was performed in the 150 ml autoclave equipped with a magnetic stirrer in the temperature up to 280°C. Four kinetic models were applied to predict the yield of four reaction product lumps. The calculation results were compared to the experimental data. Compared to the others, model 4 was the most realistic and closely matching to the experimental data. In model 4 the reaction mechanism was assumed that biomass (corncobs) first decomposed into bio-oil, followed by decomposition of bio-oil into volatile products reversibly and, finally, volatile products decomposed into gaseous products. The yield of bio-oil increased from 42.05% to 54.93% by increasing to ethanol concentration of 0% to 40%.
Estimating the normal duration using normal Production Rate per Day (PRPD) of project activity
Authors: Fachrurrazi Fachrurrazi , Abdullah Abdullah , Away Yuwaldi , Aulia Teuku Budi
Published: September 2018

A Project Estimator cannot claim that his/her estimated duration is better than others. They can determine the reasonable duration based on deterministic and probabilistic factors affecting the duration and then specify how to achieve it. This condition provides an overview that the activity duration changeable stochastically as a result of uncertainty-factors. However, we have a presumption that the activities duration will be normally distributed based on variation of its production rate per day (PRPD). The purpose of this study are (i) estimating the normal duration of the project activities using PRPD; and (ii) conducting the hypothesis testing for the PRPD normality of the project activities in South of Aceh. Hypothesis testing toward six-activities from 50 projects in South of Aceh will be used to achieve research objectives. Result shows PRPD normally distributed with skewness value still falling inside tolerance range of -1/+1. We argue that the normal duration of activity can be estimated more quickly involving its normal PRPD. An estimator does not need to predict what the factors affecting the duration estimation, especially in the bidding/tender process. They only need the normal PRPD as a standard value, to estimate, to assess and to verify the normality level of actual duration for the purpose of project decision.
Development risk analysis method for tsunami disaster
Authors: Purnawan Purnawan , Bachtiart Vera Surtia , Kurniati Titi
Published: September 2018

After tsunami disaster hit Aceh and Mentawai Island, Indonesia Government prepare disaster prevention plan for the areas that could be hit by tsunami disaster. Government has predicted that 19 areas could hit by tsunami disaster if big earthquake occur in that areas. Based on that condition, Regional Disaster Management Agency (BPBD) in several cities has prepared the evacuation facilities to reduce the effect of tsunami if the disaster is occurred. Although, the evacuation facilities have been built, however the risk from the impact of tsunami in that areas are still could not be measured. This paper shows the method to measure tsunami disaster risk, and method to determine the priorities handling tsunami impacts in certain area. This risk analysis method was developed based on risk analysis method developed by Federal Emergency Management Agency (FEMA). The risk of tsunami disaster is determined based on three parameters, i.e: threat of tsunami, vulnerability of people, infrastructure and agriculture, the inundation impact of tsunami. The priorities of tsunami risk handling to the affected areas are determined based on the Risk Prioritisation Index (RPI). The RPI values could be determined from the risk analysis values. The RPI values indicate the risk exposure rank in the tsunami affected areas. From analysis RPI value of each area, Government could determine the area that should be prioritising prevention to facing tsunami disaster because of the high risk level that could be occurred in that area.
A case study of mutual current effect on circulating current protection system
Authors: Gausultan Hadith Mangunkusumo Kevin , Adi Kusuma Aristo , Sofiarto Munir Buyung
Published: September 2018

Mutual impedance generated by the double circuit lines become such a challenge to be solved. Mutual induction arises when transmission line is a parallel line on a common right of way. In this study, a system model to observed mutual current effect on circulating current protection (CCP) system are explained. The system model is validated using actual recorded fault current waveform. In one and half breaker substation, the mutual current in maintenance line may cause CCP to pick up.
Analysis of the influence of the barrier against a range of active and passive RFID and its performance
Authors: Junus Mochammad , Patma Tundung Subali , Setiawan Awan , Kusuma Arddy Awangga , Mahfudi Isa
Published: September 2018

RFID is classified into 2 based on its power supply i.e. passive RFID and active RFID. The purpose of this research is to know the influence of the media barrier in the form of iron, aluminium, marble, glass, wood, and acrylic, to prove the influence of position of laying on tags that tilted and upright against a range of active RFID readout and passive. Knowing the shape of the radiation pattern between active and passive RFID. The most media give influence on the range of active RFID is aluminium which resulted 2.38 and the lowest media gives influence on the range of active RFID is wood which resulted 10.21 m. Whereas in passive RFID, the most media give influence on the range of passive RFID is Aluminium which resulted 0 cm and the lowest media give influence on the range of passive RFID is acrylic which resulted 42.7 cm. in testing about the influence of laying on the position of the tags obtained that in Active RFID or RFID passive can be inferred that the laying position tags give influence on the range of readings on the position of the direction of Y,-Y,-X. X.
Design and implementation of an automatic control for a laptop battery charger
Authors: Ramelan Agus , Rizqulloh M Adli , Hakim Dadang Lukman
Published: September 2018

In the process of charging laptop's battery, there is no automatic settings are disconnected and connecting the laptop charger voltage according to the needs and desires of the user. In addition, the apathetic nature of the laptop users often also lead to battery charging voltage overload on the laptop battery. These conditions will have an impact on the voltage of the battery leakage which will eventually be more easily damaged. In addition, the electrical energy will continue to flow from adaptor to the laptop and the resulting dissipation of electrical energy within a certain period. From some of these problems, the authors had the idea to make the tool as a form of solution that charging automatic controller. The tool is designed to regulate battery-charging time through additional software on the laptop. The method used was an experimental method. Results of this research have shown that these tools not only cut off the voltage from the adapter to the laptop, but also classes decide the flow voltage of 220V AC power adapter to the charger. Therefore, this tool provides two benefits at once, ie maintain the lifetime of the battery and also save electrical energy use.
The effects of welding current and purging gas on mechanical properties and microstructure of tungsten inert gas welded aluminum alloy 5083 H116
Authors: Novianto Ekak , Tri Iswanto Priyo , Mudjijana Mudjijana
Published: September 2018

Aluminum alloy 5083 H116 has an exceptional performance in extreme environments, moderately high strength, outstanding corrosion resistance in salt water and high impact strength at cryogenic temperature. In the present study, Aluminum alloy AA 5083 H116 plates were joined by tungsten inert gas (TIG) process by single and double sided welding. Welding current used was 53 A and 80 A with the addition of purging gas during welding process. The effects on micro structure and mechanical properties like surface hardness and tensile strength of the welded region were studied. The results have shown that optimum current out of the two weld current used is 53 A. Better microstructures, tensile and hardness were found in the welded joint for the weld current 53 A where the tensile obtained in the softened zone was approximately 87% than that of the base metal (BM). With increasing of TIG current, the width of PMZ increased. In addition, the doubled sided welding sequence also produced broader PMZ area.
Problem solving in phase diagram of engineering material subject through animation as learning media
Authors: Komaro Mumu , Ariyano Ariyano , Suherman A , Geovani G F
Published: September 2018

A preliminary research related to students' difficulties investigated that abstract atomic motion and counting material are the hardest materials to understand by the students. Therefore, to overcome this, a study on multimedia used in material of phase diagram was conducted. The research design was a quasi-experimental method done with pre-test and post-test to collect the data. The results revealed that the use of animation helped students to understand the material and supported them in doing their learning activity well.
Soil quality in corn cultivation using bamboo biochar, compost, and phonska
Authors: Situmeang Yohanes P
Published: September 2018

This study aims to determine the status of soil quality after biochar treatment, compost, and phonska in the cornfield. Soil samples were taken from 48 experimental plots after harvesting of maize. Assessment of soil quality is done by collecting selected indicator data including soil physical and chemical properties to observe changes in soil due to land use and agricultural cultivation practices. The soil quality status in this study was determined by calculating the value of soil quality rating (SQR) based on the weighting of 11 indicators of soil quality. The results showed that soil quality before the research was bad (SQR 30) and improved to moderate (SQR 27) until a good (SQR 20) after the research of biochar, compost and NPK phonska on the cornfield. Improved soil quality in biochar formulations 10.52 t ha-1, compost, and phonska, due to improved soil physical properties such as porosity, bulk density, and soil moisture content, which has encouraged the process of exchange and chemical reactions in the soil to release nutrients for the plant. Giving of bamboo biochar, compost, and NPK phonska on dry land cultivated maize has resulted in good soil quality (SQR 20) or approaching sustainability status is very good (highly sustainable).
The effectiveness of “Simantri” program in producing organic fertilizer and biourine to organic farming system in Bali, Indonesia
Authors: Sudita I D N , Suariani Y T L , Kaca I N , Yudiastari N M
Published: September 2018

One strategy for the Bali provincial government to produce organic fertilizer to reduce the use of inorganic fertilizers in the agricultural system in Bali through the formation of groups “Simantri”. The purpose of this study to determine the effectiveness of the group in support of government programs in the province of Bali in the supply of organic fertilizer and biourine from cattle manure in the group “Simantri”. Retrieving data using a survey method and observation in three regencies in Bali namely: Tabanan, Buleleng, and Karangasem. In every district taken three groups of cattle are “purposive sampling” on each different altitude are lowlands, plains, and plateaus so that the number of groups of as many as 27 groups of cattle. The results showed 66.49% herd to process cow manure into organic fertilizer and biourine, and the highest percentage (70.07%) in the lowlands. In the process of fermentation into fertilizer, the majority (45.50%) using EM4 as fermenters and averaging 66.49% said the results are good. Organic fertilizer produced by the group in addition to increasing the income of the group, and the majority (71.78%) use it in their farm system and can be beneficial to farmers. From this study, it can be concluded that the Bali provincial government's efforts in developing organic agricultural products through the establishment of herd program “Simantri” very effective.
Coastline change analysis and erosion prediction using satellite images
Authors: Aryastana Putu , Ardantha I Made , Candrayana Kadek Windy
Published: September 2018

The study of monitoring and analysis of coastline change and erosion prediction has been widely used satellite imagery. Satellite data that is often used in monitoring studies and analysis of coastline changes are Landsat, Quickbird, Allos, SPOT, IKONOS, etc. The aim of study is to determine an average of coastline change and average of coastal erosion in coastal area of Tabanan Regency, Bali Province, Indonesia by using two kind satellite are SPOT 5 in 2009 has a spatial resolution of 10 m (multispectral) and SPOT 6/7 in 2015 has a spatial resolution 1.5 m. This research contributes to local government and central government as a database in decision making for coastal area management. The result of analysis shows the average of coastline change in Tabanan regency is 13.96 m and the average rate of coastal erosion is 1.99 m/year. The coastline movement or erosion has caused the morphological changes.
Analysis of water quality in Maninjau Lake, West Sumatera, Indonesia using phytoplankton
Authors: Salsabil Muhammad Arif , Rinanti Astri , Fachrul Melati Ferianita
Published: September 2018

This research aimed to analyze the water quality of Maninjau Lake (0°19'N 100°12'E, 0,317°S 100,2°E), West Sumatera, Indonesia by phytoplankton as bioindicator of water quality. The quality of water was determined by identified the phytoplankton. Analyzed phytoplankton as bioindicator with Diversity Index (H′), Evenness Index (E) and Dominance Index (D). The abundance of phytoplankton ranged 273-378 cell/liter, consists of three division which are Cyanophyta, Chrysophyta, and Chlorophyta. The average value of Diversity Index (H′) is 3.52 show that the waters classified as moderate, or indicating half-polluted waters. The average value of Evenness Index (E) is 0.92 indicating that the evenness of species is medium. The average value of Dominance Index (C) is 0.12, meaning there is not any phytoplankton dominance in the waters. Maninjau Lake is slightly polluted caused by organic and inorganic contaminants from many activities surrounding especially household and fish breeding activities. The research show that Maninjau Lake is in oligotrophic state or nutrient-deficient waters.
Potential of indigenous bacteria to remove cyanide with variations of contact time and temperature
Authors: Eunike Kezia , Rinanti Astri , Ratnaningsih Ratnaningsih
Published: September 2018

The research on environmental biotechnology has been done in aims to study the ability of mixed culture indigenous bacteria to remove cyanide (KCN-) concentration which is determined by environment conditions of temperature and contact time. The research has been done using the artificial pollutants that contains 500 ppm of KCN- which is exposed to the SMSS (Stone Mineral Salt solution) as a growth media for mixed culture bacteria TBS and CTS. The effect of different environment conditions including temperature and contact time were studied on cyanide removal. Gas Chromatography - Mass Spectrophotometer (GC - MS) method is used to analysed the concentrations of KCN-. Initial condition of research operation is determined to be pH 7 and contact time of 48 hours. The removal of 500 ppm KCN- increases to 71% at incubation temperature 35°C and contact time of 36 hours. This research showed that indigenous bacteria TB1 and CS2 can remove 500 ppm KCN- on all temperature variations between (°C) 25 to 45 and the highest removal occur when contact time is 36 hours.
Environmental education model in non-formal education at coastal community based on resilience and social ecological systems
Authors: Samadi Samadi , Lestariningsih Dwi Sukanti
Published: September 2018

The study aims to identify factors for environmental education in non-formal education at coastal community, based on resilience and social-ecological systems as well as having the characteristics of marine until May-October 2014. This study used a qualitative approach, were involved in depth interview for key informant. This research was conducted in the coastal areas Cipatujah, Tasikmalaya regency of West Java Province. The results showed that the identification of factors that influence the construction of models of environmental education in the implementation of non-formal education in coastal communities are factors : (1) Strategy and Policy of Non -Formal PLH namely the carrying capacity of infrastructure and resources with the supporters as well as human resources sufficient education; (2) Carrying Capacity of Natural Resources and Environment Coastal Communities, namely the integration of ecological, sector integration and stakeholder alignment; (3) Cipatujah coastal communities need for infrastructure Grey mechanism involving roads, bridges, social infrastructure such as schools, health centers; and Blue infrastructure concerning infrastructure directly related to fishing activities such as fish auctions, boat docks, and shipbuilding. And lastly, (4) Efforts to develop and strengthen environmental education system in dire need of research location; based data systems business potential of marine and review of the supply side and demand side..
Effect of work posture on operator complaints: Choice between sitting and standing work
Authors: Anizar Anizar , Sari Rahmi M , Syahputri Khalida , Rizkya Indah , Atikah Nurul
Published: September 2018

Workers perform manual handling activities with sitting and standing work postures. In sitting work posture, this activity is performed using a 15-cm-long spade, so the workers must bend both their bodies and feet, meanwhile in standing work posture, workers use stainless steel squeegee. Workers on both postures complain of pain but on different parts of the body. Limited work facilities cause this handling activity uses body muscle repetitively. The aim of this study is to obtain an ergonomic work facility so that workers can use standing work posture with minimal pain complaints. The methods used are arterial pulse measurement, pain complaints measurement, anthropometry measurement, and designing handling device using QFD method. The subjects in this study are 6 male workers in a steel company producing threaded steel. The handling device stands 77.9 cm tall with a 15° slope so that silicomanganese can move down by taking advantage of the vibration. Workers only direct silicomanganese into the sack in standing work posture, so that performance can increase.
Three-stage flow-shop scheduling model with batch processing machine and discrete processing machine
Authors: Mauluddin Yusuf
Published: September 2018

This study discusses the model development of three-stage flow-shop scheduling involving Batch Processing Machine (BPM) and Discrete Processing Machine (DPM). Each job passes several stages of the production process from the first stage in DPM-a, the second stage in BPM, to the third stage in DPM-b. Each job is sequentially processed in DPM-a and DPM-b. in BPM; every job is handled simultaneously at the same time. The maximum weight determines the capacity of BPM. This study uses mathematic modeling approach. The result model produced in this study is Mixed Integer Linear Programming (MILP) Model. Purpose function model is minimizing total completion time. Model testing is done by using numerical examples with several data scenarios. The results showed that the model produced was the optimum model and provided a unique schedule pattern. In the future research can be formulated the heuristic model.
Design of facility layout with lean service and market basket analysis method to simplification of service process in the supermarket
Authors: Tarigan Ukurta , Tarigan Uni Pratama P , Rahman Intan Hartanti , Rizkya Indah
Published: September 2018

Supermarket company is a retail company in the field of services that sell various daily necessaries such as food, beverages, fruits, cosmetics, detergents, glassware and so forth. Problems that occur in this company is consumers are still looking for items to be purchased, notices of goods that are still wrong by the salesperson, miss communication occurs, the goods have not been neatly arranged, price tags are often lost, and items that are not complete. This resulted in longer service process time. The method used in overcoming this problem is using Lean Service and Market Basket Analysis method. The result of Lean Service method is eliminating waste in the company by using 5W + 1H concept. After the identification of waste, the company's layout is improved by using Market Basket Analysis method. In Market Basket Analysis method determined the number of samples, calculate the value of support factor, confident, and improvement ratio. The result of Market Basket Analysis method there is 14 products that have influence between one product with another. From these results obtained 3 alternative layouts and chosen the best layout alternative.
Analysis of the decision on the fresh milkfish purchase by using Analytic Hierarchy Process method (AHP)
Authors: Jakaria Ribangun Bamban , Sulistiyowati Wiwik
Published: September 2018

The milkfish buying decision of the customers in traditional markets has a variety of purposes; it is based on the interests of each customer. However, the selection made generally has the same reason, that is on the basis on the quality of the milkfish. Different harvesting process leads to different quality of the fish catch, therefore the milkfish purchasing becomes an interesting phenomenon to be conducted as a research. This study aims to find out the reason of the customers in making decision to buy milkfish by examining the alternative choice of three harvesting ways such as the process of harvesting by using the net, mérék (pushing the milkfish to a one point), ngesat ( draining the pond), by looking at the quality of milkfish which is categorized from the texture, gills, eye, smell and mucus on the surface of the body. This study uses Analytic Hierarchy Process (AHP) method. The finding shows that harvesting by using mérék (pushing milkfish to one point) results good quality of fish catch seen from the texture of milkfish, gills, and smell.