bluuebunny/crossref_metadata_2025 huggingface dataset:
The relationship of power speed and bucket elevator capacity to the slope angle of the bucket at the palm oil mill
Authors: Hamsi A. , Sitorus T. B. , Fauzan M.
Published: January 2020

The bucket elevator is material transfer equipment which function is essential in the process of processing fresh fruit bunches into palm oil, the value of effectiveness and economics is the basis for designing equipment in a factory, and bucket elevators have a certain angle. This study aims to analyze the motor power, bucket speed, and damping capacity with varying slope angle. The analysis is done by making an angle of 30,45,60,80, and 90 degrees, with as the angular variation was analyzed. Theoretically, the result shows that at the slope of 30 degrees power of the motor is 3.2 kW. The bucket speed at 6.7 m/s the damping capacity 0.00062 m3, bucket speed of 4.6 m/s damping capacity 0.00088 m3, at the slope of 60 degrees motor power 5.7 kW. The bucket speed of 3.8 m/s damping capacity 0.00106 m3 at the slope of 80 degrees motor power 7.04 kW, bucket speed of 3.1 m/s damping capacity 0.00128 m3, at the slope of 90 degrees motor power 4.9 kW, bucket speed of 4.5 m/s damping capacity 0.00098 m3. The results above and analysis shows that the slope of the bucket angle on the elevator affects motor power bucket speed and damping capacity.
Numerical simulations of the bond stress-slip effect of reinforced concrete on the push over behavior of interior beam-column joint
Authors: Tampubolon Sudarno P , Wang Chung-Yue , Wang Ren-Zuo
Published: January 2020

Structure failure often occurs in the joint. This failure can adversely affect the comfort level of the structure. Knowing the behavior of interior beam-column joint structure resulting from the load is important, as it can help to predict the strength of the structure interior beam-column joint and comfort of the structure being worked on. One way to find out and predict the strength and comfort of the structure interior beam-column joint as a result of the load received is the experimental test and simulation. The simulation VecTor2 used to predict the shear force, crack, and displacement of the reinforced concrete column when applied the shear force. This simulation considered the effect of the bond stress-slip effect of behavior reinforced concrete. Bonds stress-slip gives a great influence on the strength and hysteretic response of the reinforced concrete beam-column joint. That is why this study considers the influence of the bond stress-slip on a reinforced concrete column. All the result of simulation VecTor2 using bond stress-slip effect would be compared with the result of the experimental test to see the behavior and accuracy of the simulation test.
Nonlinear dynamic soil structure interaction in adjacent basement
Authors: Saragi Yetty , Irsyam Masyhur , Roesyanto  , Hendriyawan
Published: January 2020

This research was conducted to analyze the lateral dynamic pressure distribution on the basement walls and amplification of earthquake motion on the surface using the finite element method Midas GTS-NX. Dynamic soil-structure interaction analysis was carried out by using a sensitivity program to influence soil conditions, earthquake acceleration in bedrock, basement depth, bedrock depth and stiffness of the basement structure with a distance between basements of 15,0 m. From this study, the lateral pressure distribution of the dynamic soil reaches the maximum at the base of the basement with an increase in pressure that is almost linear in soft and nonlinear soil conditions in medium and hard soil conditions. The greatest increase in gradient occurs at a depth of four per five basement walls measured from the surface to the bottom of the basement. The analysis shows that the dynamic lateral pressure distribution has a maximum value at the top end of the basement and tends to shrink to the bottom of the basement.
The effect of rice straw fiber addition as sound silencer and its effect to concrete mechanical properties
Authors: Karolina Rahmi , Muharrisa Raisa , Handana M.A.P.
Published: January 2020

In general, rice straw has not been used optimally, rice straw is currently still used as animal feed, paper-making materials and most of it is burned. In this research, rice straw is used as an added ingredient in the concrete mixture. The addition of rice straw fiber in this research uses 0%, 5%, 10%, 15%, and 20% variations of the volume. The addition of the straw fiber affects the concrete strength. In slump test, there is an increase in its values by 8, 10, 10, 10, and 1. In compressive strength test, there is a decrease by 70.76%, 68.61%, 54.35%, 53.49% of normal concrete. In the tensile strength test, there is a decrease in the concrete tensile strength value by 52.39 kg / cm2, 38.31 kg / cm2, 35.36 kg / cm2, 25.49 kg / cm2, 25.42 kg / cm2. While on the sound attenuation test, there is an increase on sound absorption coefficient, the greater the variation of rice straw, the higher the sound absorption coefficient value. The relation between concrete strength and sound absorption coefficient shows that the greater the addition of rice straw fiber, the less the strength of concrete while the sound absorption coefficient is greater.
Experimental study of corrosion rate on st60 steel as a result of immersion in HCl, NaOH, and NaCl solutions
Authors: Tjahjanti P H , Kurniawan M M , Firdaus R , Iswanto AT
Published: January 2020

The purpose of this study is to calculate corrosion rate (CR) of ST60 steel. A wet corrosion test was conducted by dipping ST60 steel in the solution of HCl, NaOH, NaCl. Use weight loss Method to calculate CR. It was found that the highest corrosion rate occured when the specimen of ST60 steel dipped on HCl0.1M solution. Corrosion that occurs for all corrosion tests is immersion in HCl, NaOH, and NaCl solutions produces uniform corrosion
Tool life investigation of carbide cutting tools in the turning of cast iron material.
Authors: Lubis M. Sobron Y. , Djamil Sofyan , Steven D , Andri
Published: January 2020

Tool life is an important thing to consider in the process of metal cutting. Before the machining process is done, it is necessary to know how long a cutting tool is capable of cutting before wear occurs. However, it is difficult to predict the life of the cutting tool, because each cutting tool has different characteristics in cutting metal. The research was conducted aimed at predicting the life of cutting tool using the Taylor equation, but the n and C constants contained in the equation vary for each type of cutting tool used in cutting workpieces. Through the experiment of cutting metal using a lathe, the cutting tool was observed and measured for wear, so that there was a limit to the value of the wear edge of the VB tool by 0.4 mm. The three cutting speed variants used in the cast iron machining are 180, 210 and 249 m / min. Observations were made every 10 minutes machining was stopped to be measured using a Digital Microscope if the wear value of the cutting tool has not been achieved, then machining continues. The worn cutting tool is no longer used in machining, then uses the new cutting tool. The results of the study showed that the increase in cutting speed had an effect on the wear rate that occurred in the cutting tool. The extended equation for Tool life of Taylor is obtained by Vc. Tl.0.81 = 5011.87
Tensile strength of car spoiler product based on ABS plastic and rattan fiber epoxy composite materials
Authors: Irawan Agustinus Purna , Adianto  , Sukania I Wayan
Published: January 2020

This study aims to obtain the tensile strength of the car spoiler product material made from ABS Plastic. Spoiler products are obtained from free markets that produce car accessories. Tensile strength obtained will be used as comparative data for the development of composite material based spoiler car products reinforced with rattan fiber with epoxy matrix. Tensile strength testing refers to the ASTM D3039/D3039M testing standard. Based on the results of the study, the average tensile strength of ABS Plastic obtained was 34.61 ± 0.67 MPa with an average strain of 5.53 ± 0.89 mm/mm. The average tensile strength of rattan fiber epoxy composite obtained was 26.71 ± 1.18 MPa, while the strain is 4.48 ± 0.87 mm/mm. Based on the results of SEM testing, it can be seen that the material is a little void due to the manufacturing process. Voids that occur will reduce the strength of the spoiler product. The results of this study will be one of the references in product development for car spoilers. Keywords: tensile strength, SEM, car spoiler products.
Effect of cocopeat and brass powder composition as a filler on wear resistance properties
Authors: Setyawan Eko Yohanes , Djiwo Soeparno , Praswanto Djoko Hari , Siagian Parulian
Published: January 2020

This hybrid composite is a combination of materials from cocopeat and brass powder as reinforcement with polyester resin as a binder. This hybrid composite is applied to disc pad product material. In the percentage of the composition will be affected of wear resistance of the product. The functions of disc pad as a brake where the principle works rubbing against the disc brake, it is necessary to have composite wear testing. This research method uses the ogoshi method on wear testing by varying the composition of the percentage of cocopeat and brass powder and in testing there are 2 treatments, namely dry and wet conditions. The results showed that sample 6 with a composition of 40% cocopeat and 60% brass powder had wear resistance of 3.3 x 10-6 mm2 / kg with a temperature of 41 °C in dry conditions and 2.02 x 10-6 mm2 / kg with a temperature of 40 °C wet. Wear resistance in sample 6 is higher than disc pad market and close to below the original market so that this composition can be recommended as a disc pad material.
The effect of heat treatment BPSCCO-2212 and LSCO superconductor
Authors: Mustika Lubis Putri Suci , Humaidi Syahrul , Imaduddin Agung , Perdamean
Published: January 2020

Research on superconductors (Bi, Pb) -2212 have been mixed with LSCO superconductors. The mixture was carried out after the phase (Bi, Pb) - 2212 and LSCO phase were formed. The sample was made by solids reaction method with sintering temperature 850°C and 1050°C. The precursors were mixed with a composition of 50%: 50%, obtained 5 samples, namely B1, B2, B3, B4, and B5 and heated for 10 hours each at a temperature of 400°C, 600°C, 800°C, 900°C and for B1 only mixed without being heated. Based on our results, the effect of optimal temperature was 900°C with the formation of Tc, onset of 70.83 K and Tc, zero 30 K.
Effects of palmitamide on cure and tensile properties of styrene butadiene rubber
Authors: Surya I , Edwin  , Hafni K N
Published: January 2020

A semi EV curing system was applied for studying the effects of palmitamide on cure and tensile properties of silica-filled styrene-butadiene rubber (SBR) compounds. The palmitamide was prepared from palmitic acid and urea. As an additive material, the palmitamide was added into the silica-filled SBR at 0.0, 1.0, 3.0, 5.0 and 7.0 parts per hundred rubber (phr.). It was found that the palmitamide acted as a curative additive material which decreased the scorch and cure times but increased the difference in torque of the silica-filled SBR compounds. The higher the palmitamide loading, the shorter the scorch and cure times were. It was also found that the palmitamide acted as an internal plasticizer material which decreased the minimum torque. The tensile moduli and tensile strength were increased but the elongation at break was decreased up to a 3.0 phr. of palmitamide loading. From the swelling test, the improvements in tensile properties were attributed to the improvements in crosslink density as well as the cure state of the silica-filled SBR compounds.
Micro-structures and magnetic properties of Mg-Al substituted in barium hexa-ferrite prepared by co-precipitation method
Authors: Rianna Martha , Sembiring Timbangen , Situmorang Marhaposan , Tetuko Anggito P. , Setiadi Eko Arief , Ginting Masno , Sebayang Perdamean
Published: January 2020

In this study, Mg-Al substituted barium hexa-ferrite of BaFe12-2xMgxAlxO19 (x=0-0.2) materials using co-precipitation method at a calcination temperature of 1200°C for 2 hours were carried out. The precursor concentrations of the mixture were varied to identify the optimum sample. The final powder was characterized by using XRD, FE-SEM, and VSM. The XRD shows that the Mg-Al substitution was not change the micro-structures of barium hexa-ferrite. FE-SEM observation was carried out on the surface of hexagonal shape of barium hexa-ferrite. The magnetic properties shows that the decreases saturation (Ms), remanence (Mr) and coercivity (Hc). The optimum condition was obtained on x=0.2 with Ms=29.28 emu/g, Mr=15.33 emu/g, Hc=1259 Oe.
Numerical study on melting process of Phase Change Material as thermal energy storage
Authors: Samar  , Ambarita Himsar , Napitupulu Farel H. , Sitorus Tulus B.
Published: January 2020

The use of phase change material (PCM) as thermal energy storage is increasingly in demand. This is because PCM has high storage capacity. Thermal energy can be stored, not only as sensible heat, but also in the form of latent heat. A model for investigating the melting process of paraffin wax which is used as thermal energy storage, was developed in the ANSYS FLUENT simulation software environment, then the results were analyzed and compared with the results of previous experiments. The simulation results show that the melting process occurs relatively faster than the melting process in the actual experiment, due to the construction of the paraffin wax container. Also due to the construction of a cube-shaped paraffin wax container, paraffin wax remains in the lower right corner of the container. The effect of placing thermocouples in paraffin wax container, which when compared to the relatively small size of the container, can be significant. This certainly needs further investigation. The choice of heat source and how to keep its temperature constant in experiment need also to be investigated further. Based on the results obtained through this study, the use of PCM as cold storage in solar photovoltaic air conditioning system is worth considering, as thermal backup or even tosubstitute the battery storage system that has been used all this time.
Simple designed of charge controller based on microcontroller for caddy cars using solar panels
Authors: Sunardi  , Margolang Julfansyah , Pratama Bobby Noval , Panjaitan Albert , Sinambela Marzuki , Hutabarat Liber Tommy
Published: January 2020

A charge controller is needed not only to improve the efficiency of the caddy cars but also to protect the storage batteries. The main function of a charge controller in Candy Cars is to charge the battery without permitting overcharge and deep discharge as an alternative power source. The study aimed to study and monitor a device that will obtain a controlled power supply. The results of the study obtained the design of voltage pulse generator has yielded a significant result, namely the maximum voltage V max pulse battery is approximately 3.08 % and the current on a step up/down module is 12.5 %
High voltage designed and pulsed electric field circuit using standard sphere-gap method
Authors: Tarigan Kerista , Perangin-Angin Bisman , Tamba Takdir , Manalu Andriono , Purba Frikson Jony , Sinambela Marzuki
Published: January 2020

The circuits designed of the high voltage pulsed source using the sphere-gap as switching and will be used as generating of the high voltage pulsed electric field (PEF). Based on the experiment testing that the high voltage source can produce 80 kV with the efficiency of high voltage DC source is 81.70% and the operating voltage of sphere-gap is 18.5 kV. Therefore, the intensity of the pulsed electric field of the design can be reached at 80 kV/cm. Based on this ranges that design can be used for electroporation process. Furthermore, this tool was tested into a sample, Nematode. For Nematode sample testing, the electric fields strength is E = 37.33 kV/cm on the voltage of between the electrode is 6.7 kV. Thus, the design of the pulsed electric field source using a sphere-gap has functioned.
Isolation of prebiotic inulin from Gadung Aceh tuber (Dioscorea Hispida) using hydrolysis reaction
Authors: Putri A D , Kurniasih E , Hasanah U , Rahmawati
Published: January 2020

The goal of this research to identifity inulin compounds in Aceh gadung tuber (Dioscorea Hispida) by using hydrolysis method with variations hydrolysis time 30 minutes; 60 minutes; 90 minutes and hydrolysis temperature 70°C; 80°C. Inulin is a group of carbohydrate that are prebiotic. Inulin is usually use a substitute for fat and sugar in low calorie food product. The hydrolysis method used can convert the carbohydrate from tuber starch to glucose and also convert it to simple sugar that is fructan. The analysis in this research is detected inulin function group by analysis Fourier Transform Infrared Spectroscopy (FTIR) and yield of crystal inulin. Isolation inulin used material and solvent (1:5) can obtained the best treatment of isolation inulin is operating condition at hydrolysis temperature 70°C by hydrolysis time 60 minutes, in this condition the yield of crystal inulin is 42%.
Isolation of capsaicin compounds from cayenne as a food additives material
Authors: Zahra A R , Kurniasih E , Fadilla I , Mauliana
Published: January 2020

This study aims to isolate the capsaicin compound from cayenne by reflux method using methanol solvent. Yield oleoresin obtained as much as 51,71% of 30 grams of dried cayenne at a ratio of 1:16 with extraction time for 7 hours. Oleoresin has a blackish brown color, thick and has a spicy smell. The obtained oleoresin was analyzed by Spectrophotometer FTIR show that chain – OH, -NH, CH2, -CH3, C=C, C=O and O-CH3.
Biodiesel synthesis from refined bleached and deodorized palm oil (RBDPO) by transesterification using durian shell based carbon modified with KOH as heterogeneous catalyst
Authors: Munawar A , Taslim  , Manurung R , Iriany
Published: January 2020

In this study, an attempt had been made to use durian shell as carbon source for catalyst support for transesterification reaction. In this research, refined bleached and deodorized palm oil (RBDPO) and methanol were used as feedstock. The aim of this work was to evaluate the capability of durian shell based carbon as heterogeneous catalysts in transesterification of RBDPO. Carbonization of durian shell was conducted at 600°C for 2 h. The carbon resulted was modified by impregnation with potassium hydroxide (KOH) followed by drying and calcination. The modified activated carbon was characterized by Scanning Electron Microscopy – Energy Dispersive X-Ray Spectroscopy (SEM-EDS). This heterogeneous catalyst was utilized in transesterification of RBDPO. Transesterification of RBDPO was performed at 60°C and 500 rpm. Effect of process variables such as the load of catalyst and reaction time was investigated. The highest yield of 97.29% biodiesel was obtained by using 12:1 molar ratio of methanol to RBDPO at a reaction time of 90 minutes in the presence of 3 w% catalysts. The resulted biodiesel was then characterized for its ester content, density, and viscosity. The biodiesel properties met the Indonesia standard (SNI). The results confirmed that activated carbon from durian shell modified with KOH is suitable as a heterogeneous catalyst in the synthesis of biodiesel.
Ethnobotany, nutritional composition and sensory evaluation of Garcinia from Aceh, Indonesia
Authors: Suwardi Adi Bejo , Navia Zidni Ilman , Harmawan Tisna , Nuraini  , Syamsuardi  , Mukhtar Erizal
Published: January 2020

Garcinia species have various benefits, such as the production of edible fruit, oil, and medicine. This study aimed to evaluating ethnobotanical knowledge and nutritional composition and sensory characteristics of Garcinia species from Aceh, Indonesia. Eight of the Garcinia fruits collected from three regencies in the province of Aceh. Analyzed the composition of Garcinia nutrition was conducted in laboratory of Universitas Samudra. The ethnobotanical data were obtained using a semi-structured interview involved sixty respondents. The sensorial evaluation of various Garcinia was performed by using 9 points hedonic scale. Ethnobotanical data and sensory evaluation were evaluated using descriptive statistics. The findings showed that Garcinia was used by local people in the province of Aceh as a source of food and traditional medicines. Garcinia xanthochymus Hook. f. ex T. Anderson was higher in total carbohydrate and crude fiber content, while the highest crude protein was found in Garcinia celebica L. Furthermore, G. mangostana was superior in flavour and color, while the highest value for flavour attributes was found in G. celebica. In general, the highest overall acceptance score was found in G. mangostana.
The effect of silica liquid fertilizer from straw and formulation of bacillus sp for rice growth (Oryza sativa L.) and tolerance to fungi Pyricularia oryzae Cav
Authors: Fajaruddin  , Karmiati  , Aulya Wanda , Fitriani  , Persada Andri Yusman
Published: January 2020

Blast disease caused by Pyricularia oryzae.This disease which generally was caused by environmental conditions, plant age, and the level of plant resistance. One of effort to control it was used insecticides, where more used could adversely affect the environment due to toxic chemical residues. The purpose of this study was to determine the effect of the used of silica liquid fertilizer from straw and the formulation of Bacillus sp for the growth of rice and tolerance to diseases of blast or Pyricularia oryzae. The method was the factorial RAKL pattern with 2 treatment factors that were dosage formulation of Bacillus sp and the composition of liquid silica fertilizer with 6 repications for each treatment. Data analysis was used ANOVA with significant level of 5% and continued with the Smallest Significant Difference Test (DMRT). The results of the study showed that the added of liquid silica with a concentration of 12 ml and the formulation of Bacillus sp 6 grm / pot gave a significant effect on plant height, number of leaf tillers, and mean percentage of damage to rice.
Medium and filter from activated carbon in aquaponics system (Oryza sativa and Oreochromis niloticus) to improve water quality
Authors: Nadilla Fara , Wahyuni Nurul , Maulizar Sandri , Fitriani  , Amri Yulida
Published: January 2020

In this study aquaponics system (Oryza sativa and Oreochromis niloticus) from activated carbon has been carried out. Activated carbon acts as absorbent, catalyst and filters in water purification, and is able to absorb anions, cations, and molecules of organic and inorganic compounds in the form of solution or gas. The purpose of this study was to determine the effect of activated carbon thickness from organic waste on decreasing the toxicity of water in the aquaponics system. Water quality parameters such as temperature, dissolved oxygen (DO), pH and ammonia content were measured at 20, 40 and 60 days after maintenance. The variation of treatments are P0 (as control), P1=1,5 cm activated carbon, P2=3 cm activated carbon, P3 = 4.5 cm activated carbon and P4=6 cm activated carbon. Based on the results of the study found that the use of activated carbon as medium and filter in an aquaponics system (rice-fish) can maintain water quality for 60 days of maintenance. The optimum water quality for the growth of fish and rice was in treatment P3 (4.5 cm thickness of activated carbon) and P4 (6 cm thickness of activated carbon). The thicker the activated carbon used, the more optimal the water quality.
Fortification of chitosan and mangrove flour as windu shrimp feed (Penaeusmonodon) against infection white spot syndrome virus
Authors: Manik Herkules , Solin Marniati , Thami Khairul , Fitriani  , Fajar Beni Al
Published: January 2020

Langsa is one of the largest Windu shrimp producing areas in ACEH that holds considerable potential in the cultivation of windu shrimp. But recently the production of tiger shrimp has deteriorated due to by various disease attacks that have caused shrimp deaths including White Spot Syndrome Virus. This disease is a crop failure disease with high levels of mordibity and mortality. Transmission of WSSV was very fast and led to a 100% death within 3-10 days since the clinical symptoms arose. Therefore, research is conducted to prevent and treat WSSV by using shrimp skin and mangrove flour as feed. Chitosan flour from shrimp skin waste has the potential to be used as feed. The aim of this study was to determine the effect of fortification of chitosan and mangrove flour as windu shrimp feed on physiological conditions of windu shrimp. Physiological observations carried out include feeding responses, swimming, body redness (body color changes), white spots on the carapace and counting shrimp that die during maintenance. Physiological observations carried out include feeding responses, swimming, body redness (body color changes), white spots on the carapace and counting shrimp that die during maintenance. Based on the results of the study show that the more mangrove flour and chitosan fortified in shrimp feed, the level of shrimp resistance to white spot syndrome virus infection is increasing which is characterized by a low mortality rate.
Fatty acid production from avocado seed by activating Lipase Enzyme in the seed
Authors: Tambun R , Tambun JO A , Tarigan I A A
Published: January 2020

During this time avocado seeds are not utilized optimally because they are considered as waste. The amount of avocado seeds from day to day is increasing, along with the increasing production of avocados. This avocado seed has many benefits including having oil and lipase enzymes that can be used to produce fatty acids. This study aims to produce fatty acids directly from avocado seeds by activating the lipase enzyme found in the seeds of the avocado. This research is carried out by destroying the avocado seeds using a blender, then adding water with variations between 0% - 40% to the mass of avocado seeds. This reaction is carried out at temperatures of 30 °C and 35 °C and is carried out by stirring and without stirring. Analysis of acid levels is carried out from 0 hours to 48 hours. From the research conducted, the highest fatty acid content is 11.67%. This result is obtained after 12 hours of reaction at temperatures of 35 °C with the addition of water by 40% and is carried out by stirring.
Preliminary phytochemical screening of different solvent extracts of flower and whole plant of Wedelia biflora
Authors: Mardina Vivi , Halimatussakdiah  , Harmawan Tisna , Ilyas Syarifuddin , Tanjung Masitta , Aulya Wanda , Nasution Annisyah
Published: January 2020

In this study, comparison of preliminary phytochemical screening of Wedeliabiflorawas conducted using the n-hexane and ethyl acetate solvents extracts. The W.biflora samples were grouped into flowers andleaves. The different solvents of flowers extracts exhibited secondary compound viz. flavonoid, alkaloid, fenol, tannin, steroid, and saponin. While the extracts of leaves revealed flavonoid, alkaloid, fenol, tannin and steroid without saponin. Thus, the present of various bioactive components in the W. bifloraextract might bepotential for responsible on the pharmacological activities including antifungi, antibacterial, antioxidant, anti-inflammatory and anticancer.
Determination of the most dominant cause factors due to erosion in the farmland of Sibolangit sub-district
Authors: Simbolon Shanti Desima , Nasution Zulkifli , Rauf Abdul , Delvian
Published: January 2020

Solving erosion problems is often inefficient and effective because of lack a deep understanding of the most dominant causal factors. It really depends on how the results of our research of the factors that influence and relate to each other. Erodibility, slope and crop management are three factors that influence the amount of erosion. Each of these factors has a different index value indicating differences in the magnitude of the effect on erosion. The erosion model designed to predict long-term erosion is the USLE Method. The formula for the USLE equation is as follows: A = R.K.L.S.C.P where A=the amount oferoded soil in tonsha−1 year−1; R=rainfall factor; K=soil erodibility factor; L=slope length factor; S=slope factor; C=crop management factors; P=soil conservation factor. The statistical analysis used to answer the most dominant factor is multiple linear regression analysis. The results of this research showed that the highest erosion was 11,302.79 tons ha−1 year−1 in SPT-24, followed by SPT-5 of 3192.88 tons ha−1 year−1 and SPT-25 of 2408.33tonsha−1year−1 while the lowest erosion on SPT-26 is 21.06 tons ha−1year−1. Based on the analysis results obtained the most dominant factor is soil erodibility with a coefficient of determination (R2) of 61.4% so that the focus on erosion handling offarmland in Sibolangit Sub-Districtis minimum and contour tillage, optimize use of green manure and compost, land cover with plant litter. All of the aim is to improve each factor that affects erodibility, namely texture, structure, permeability and soil organic matter.
Effect of gamma rays on phenotypic of garlic cultivar doulu
Authors: Gultom Tumiur , Simbolon Delima Lisma , Nainggolan Wandes Sanbara
Published: January 2020

This research aims to determine the effect of gamma-ray irradiation on the phenotypic of the garlic cultivar Doulu. The study was conducted in April-August 2018. Radiation on the bulb garlic is carried out at the centre of Safety and Meteorological Technology (PTKMR), BATAN, Jalan Lebak bulus Raya No. 49 Jakarta. Bulb planting is done at the research Hall of vegetable crops, Tongkoh village, Berastagi, North Sumatera. The draft used in this study is non factorial group random draft with 6 radiation dose treatment of 0 Gy (Control), 2 Gy, 4 Gy, 6 Gy, 8 Gy and 10 Gy. Each of the treatment levels is repeated as much as 4 and consists of 10 cloves of garlic. The observed quantitative data parameters are growing age, crop height, number of leaves, number of cloves, heavy bulbs, diameter of bulb, heavy cloves and diameter of cloves. The qualitative data parameters observed are bulb structures and bulb forms. Qualitative Data obtained is analyzed using various prints with advanced test of the smallest real difference (LSD). The results shows the irradiation of the influential gamma rays in the height of the plant, the number of leaves, the number of cloves, the weight of bulbs, the diameter of the bulb, the weight of cloves, and the diameter of garlic cultivars Gamma-ray irradiation produces a variety of bulb structures and bulb shapes. The parameters observed were structure and shape bulb based on IPGRI. Results showed that there were differences in the structure and shape of garlic bulbs.The structure of bulb are regular two-fan groups, regular multi-cloved radial, regular quadruple, regular two-cloved, and Irregular. The shape of bulb are Flat, Flat globe, Rhomboid, Broad oval, Globe and Ovate.
Antioxidant activity of methanol extract of Diplazium esculentum (Retz.) Sw. leaves collected from Aceh
Authors: Halimatussakdiah  , Amna U , Mardina V
Published: January 2020

Cell damage mediated by free radicals is one of the main causes of many dangerous diseases such as cancer, autoimmune disorders, rheumatism, cataracts, aging, cardiovascular disease, diabetes, arthritis, Parkinson, Alzheimer and neurodegenerative diseases. The prevention of dangerous diseases caused by free radicals can be done by developing raw materials for natural antioxidant drugs that can reduce free radicals by giving one of their electrons to produce neutral molecules that are not harmful to the human body, such as fern (Diplazium esculentum (Retz.) Sw.). D. esculentum collected from Aceh was extracted in methanol. The antioxidant activity of this extract was determined by 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity assay. The result showed very good activity of the DPPH antiradical efficiency of methanol extract of D. esculentum with IC50 values of 123.958 ppm. Based on phytochemical screening, D. esculentum contained polyphenol compounds that have good activity as antioxidant. This result indicated that D. esculentum has potential as antioxidant and can be applied in the development of new medicines.
Performance of TB health center service officers based on compensation effect, supervision and competence using machine learning technique
Authors: Purba Japirman , Bahri Syaiful , Khair Hazmanan , Darnila Eva , Sinambela Marzuki
Published: January 2020

Tuberculosis as a major health problem in Indonesia, need to evaluate the procedure to solved and increase the solution. The objectives of the research were to discover the correlation of performance of TB Health center service based on compensation effect, supervision and competence. The population consisted of 78 correspondence were taken as the sample through cluster random sampling technique. The study aims to the identification and evaluates the officer competence, supervision, and compensation of TB problem in the Medan Area, by using Machine learning technique to test the correspondence. The results of the research concluded, there was a significantly positive correlation between compensation effect, supervision and the competence with the performance of TB Health Center officers.
Algorithm solution for space-fractional diffusion equations
Authors: Sunarto A , Sulaiman J
Published: January 2020

In this study, we propose approximate algorithm solution of the space-fractional diffusion equation (SFDE’s) based on a quarter-sweep (QS) implicit finite difference approximation equation. To derive this approximation equation, the Caputo’s space-fractional derivative has been used to discretize the proposed problems. By using the Caputo’s finite difference approximation equation, a linear system will be generated and solved iteratively. In addition to that, formulation and implementation algorithm the Quarter-Sweep AOR (QSAOR) iterative method are also presented. Based on numerical results of the proposed iterative method, it can be concluded that the proposed iterative method is superior to the FSAOR and HSAOR iterative method.
Machine learning approach for turbulence forecasting using support vector machine
Authors: Anwar Darul , Sembiring Kurnia , Tarigan Kerista , Sinambela Marzuki , Abubar Abd. Rachman , Hasibuan Doli
Published: January 2020

The turbulence can be expressed as small-scale, short term and frequent change to the velocity of air. The turbulence forecasting in the atmospheric boundary layer is very influenced by gradient Richardson number values. In this case, we use the data set were retrieved from Indonesia Meteorology, Climatology and Geophysics in synoptic hour 0000H. In particular, our methods will use Richardson number value and machine learning approaches by using a support vector machine to forecast the Richardson number value and identification the stability of the layer based on the turbulence forecasting. The results will be practically beneficial as utilities can use the predicted values to generate an adequate amount of Richardson number value to avoid grid outages as well as construct dynamic pricing schemes based upon future turbulence.
Determination of accuracy value in id3 algorithm with gini index and gain ratio with minimum size for split, minimum leaf size, and minimum gain
Authors: Putra Randi Rian , Dhany Hanna Willa
Published: January 2020

A process that explains and functions to distinguish data classes is called Classification. The use of Gain Ratio in ID3 algorithm is very influential on accuracy compared to the Gini Index, and if the higher the determination of the minimum size of split, the minimum leaf size and the minimum gain, the accuracy results will be greater in the gini index and gain ratio, but from both methods there is an accuracy difference of 27% for each accuracy test. In determining the minimum size of split 2, the minimum leaf size 2 and the minimum gain 0.4 with the value of accuracy at the gain ratio of 85.53% and gini index 58.67%. The minimum size of split 6, the minimum leaf size 3 and the minimum gain 0.8 with accuracy values at gain ratio 64.67% and gini index 60.67%. Then the minimum size of split 12, the minimum leaf size 6 and the minimum gain of 0.16 with the value of accuracy at the gain ratio of 86.00% and the index of 68.00%. While the minimum size of split 48, the minimum leaf size 24 and the minimum gain of 0.64 with the value of accuracy at the gain ratio of 95.33% and the index value of 72.00%. Then the Gain ratio which produces the highest accuracy value compared to the gini index.
Improve BIRCH algorithm for big data clustering
Authors: Ramadhani Fanny , Zarlis Muhammad , Suwilo Saib
Published: January 2020

Big Data is a collection of data with super large data volumes, has a very high diversity of data sources, so needs to be managed with methods and devices that help perform accordingly. Clustering is one of the effective techniques for dealing with Big Data. The hierarchical method with the BIRCH algorithm is able to produce a short time in data execution. The BIRCH algorithm is a matching grouping algorithm for very large data sets. In an algorithm, a CF-tree is built in which all entries in each leaf node must meet same T threshold, and the CF-tree is rebuilt at each stage with a different threshold. But using a static (fixed) threshold produces poor cluster quality, in this paper proposes a solution to this deficiency by modifying the Threshold value to dynamic so that it can produce good cluster quality and be validated using silhouette coefficient (SC). There is a very clear difference between the standard BIRCH algorithm and the BIRCH algorithm on the modified T parameter (BIRCH (CF-Leaf (modif)). The CF-Node result, the total CF-Entries and Total CF-Leaf Entries produced 60% less than CF-Node, the total CF-Entries and Total CF-Leaf Entries in the standard BIRCH algorithm.
Formulating cloud based hospital information system (HIS) with Zachman framework
Authors: Gunawan Wang , Liejaya Bellarika
Published: January 2020

Information Technology and System (IT/S) has become essential components in the companies in various focuses and fields. Major Indonesian companies experience difficulties to link the business objectives with IT implementation, that lead to creating major problems, such as: ineffective IT investment, major complaints amongst potential stakeholders, etc. The article takes the case study of one of the largest hospital chains, XYZ Hospital that has 21 subsidiaries operating in major cities in Indonesia. Currently, The XYZ hospital has cloud-based computer system that integrates entire business processes in Hospital Information System (HIS). Due to its all advance computer systems, ironically, the HIS receives many complaints and dissatisfaction amongst major stakeholders of the hospital. The director has risen the issue to evaluate the current HIS development. For this reason, the article proposes the popular Enterprise Architecture, Zachman framework to assess the current business process in the organisation. To simplify the discussion, the framework is simplified to the essential component of 3x3 matrix, and links them with 3 important stakeholder’s perspectives of HIS development: planner (scope), owner (enterprise model) and designer (system model). The outcome is expected to provide reference for those important stakeholders for further HIS development.
Applying smart parking system with internet of things (IoT) design
Authors: Mufaqih Moh Sukron , Kaburuan Emil R. , Wang Gunawan
Published: January 2020

Managing parking system has become major issues in almost all malls in Jakarta. The majority of mall in Jakarta have difficulty to develop plan that enables to optimize their parking slots. Some malls use valet system to gain more profit or ease the customers, unfortunately the valet system price is quite expensive for major customers and it sounds unpopular. Therefore, many area of valet parking space is not maximized. The similar problems also faced by traditional parking system where it creates problems for customers such as difficult to find parking space, paper ticket missing and unable to locate car location. The purpose in this study is to propose a Smart Parking System (SPS) through the use of Internet of Things (IoT). The article applies smart parking system that enables online booking system, paperless ticket, cashless payments and automated guided parking. The objective of the article is expected to enhance the current online parking management system with IoT design, with the aim to be used as reference for parking management in malls.
Analysis of the effect number input and hidden layer variations on the addition kohonen algorithm to backpropagation method
Authors: Putra P H , Zarlis M , Mawengkang H
Published: January 2020

The process of recognizing data patterns using the method of adding kohonen to back propagation is very influential on the amount of input data and the number of hidden layers. The results of the testing with the addition of information on the back propagation algorithm have better epoch results in testing using input data 8 has an epoch value that is better than testing using the number of input data 3,4,5,6,7. The test results using layer 5 hidden have epoch 15 value which is better than the hidden layer 3, 4,6,7,8.
A computation in the braid group
Authors: Nasution Mahyuddin K M
Published: January 2020

The braid group is a structure. It has the concepts and the implementations in graphics: points, lines, and some crosses. The crosses are also positive and negative. A braid not only forms graphs, but in different structures based on mathematics. So far, the braids only applies to discrete concepts, but it is possible to present a fuzzy concept. By applying computing to symbols representing the braids, the concept towards fuzzy as generating the form of another structure.
The data warehouse for guarantee of objects in the fiduciary
Authors: Prasetia Frabowo , Tampubolon Parlindungan , Hakim Arif Rahman , Girsang Abba Suganda , Simamora Roni Jhonson
Published: January 2020

The data warehouse is a structured data environment for decision support systems (DSS) and online analytical application data sources. Finance the guarantee data is extremely important because this data is checked you will be State-run finance is already good or less good, already underway in accordance with standard operational procedures. Show case of branches; see the status of data has been done by each branch, the amount of any status on a branch that has performed guarantee. The data of the vehicle that has been issued by a fiduciary as well as consumers who have made the assurance to the fiduciary. The methods used in this paper are to follow nine step. The objectives to be achieved from this paper so that the resulting data can answer the question of fiduciary business process, by generating the dashboard as a faster visualization on understanding and a report
RETRACTED: Clustering steam user behavior data using K-Prototypes algorithm
Authors: Ranti Kiefer Stefano , Salim Kelvin , Girsang Abba Suganda
Published: January 2020

The usage of user telemetry to gather player behavioral data on video games can be very beneficial to game developers with a certain business model. With the help of user telemetry in game development, it can provide access to data on user behavior from installed game clients’ platform such as Steam. These behavioral data can be used to find out the Steam user behavioral patterns on playtime distributions that can be studied by developers in order to have a deeper understanding of the behaviors of their players. In this study, the data are clustered using the k-prototypes algorithm, a combination of k-means and k-modes algorithm that can be used to cluster mixed attributes. The result shows that the clusters represent the types and preferences of the players.
Using DeLone and McLean model for evaluating an e-commerce website
Authors: Yel Mesra Betty , Sfenrianto Sfenrianto , Anugrah Raka Doni
Published: January 2020

E-commerce in Indonesia has grown rapidly and provided many positive impacts especially on the field of online business. Through the developments, there are certainly many factors that must be carefully considered in all aspects to get the “goal” as desired. So, when an e-commerce website has made changes whether we can conclude that the results worked so far or not. It can start by taking the existing factors that become the determinant of one of the successes in the e-commerce website. The study aims to evaluate factors become the success of an e-commerce (jualandbeli.com). Using the McLean and Delone success model approach that has 5 factors, namely: system quality, information quality, use, user satisfaction and net benefit. The result shows system quality, user satisfaction, and net benefits influence to use factor. net benefit influence to use. Quality of information influence to user satisfaction factor.While user satisfaction influence on net benefit factor. Thus, be expected, the model can be used as reference in related evaluating an e-commerce website.
Analysis of neural network algorithm in determining high school student department
Authors: Siagian Novriadi Antonius , Zarlis Muhammad , Situmorang Zakarias
Published: January 2020

In senior high schools, especially in the first class were required to place a department that is in accordance with the value produced. The application predicts student majors based on the value of students using artificial neural network algorithms using rapid miner to be able to produce more precise and faster accuracy results. The results obtained from the analysis carried out obtained an accuracy value of 71.86%.ANN has a network architecture that is a single layer net. Networks that have more than one layer are called multilayer net and competitive layer networks (competitive layer net). The shape of a multilayer net 1 or more has between the input layer and the output layer, which weighs between 2 adjacent layers. ANN architecture using 3 layers is 7 input layers, 6 hidden layers, and 2 output layers. 20 neurons are the number of neuron outputs to artificial neural networks
Optimization of giving employee craft assessment using artificial neural network with Hebb algorithm
Authors: Napitupulu Segar , Situmorang Zakarias
Published: January 2020

One of the most important things in human resource management is employee discipline that can be seen in employee presence. It is very important for companies to set up employee attendance systems properly. In general, benefits - allowances are always associated with employee precession data, so that the results of the calculations became accurate and balanced with employee performance. As is the case with craft benefits, this craft allowance is held for companies to improve employee discipline, especially in presence or presence. Based on the background of the above problems, a problem can be formulated, namely the determination of the model in the process of determining the recipients of employee craft benefits so that the monthly income is optimal and significant. Based on the problem, the authors are interested in redeveloping the final project with the optimization of giving employee craft assessment using the hebb rule neural network method.