bluuebunny/crossref_metadata_2025_split huggingface dataset:
Nonlinear dynamic soil structure interaction in adjacent basement
Authors: Saragi Yetty , Irsyam Masyhur , Roesyanto  , Hendriyawan  
Published: January 2020

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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.