bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mobile augmented reality for furniture visualization using Simultaneous Localization and Mapping (SLAM)
Authors: Ramadhan W , Arifitama B , Permana S D H 
Published: March 2021

Abstract
The purpose of this research is to visualize furniture objects from a catalogue using a markerless augmented reality tracking. Augmented reality is applied to help customers to envision an augmented object for learning the product knowledge of the furniture chosen. The markerless tracking method used in this research is a Simultaneous Localization and Mapping (SLAM), where a targeted surface of the floor for an augmented object can be determined in certain areas in the real world without using a marker. Testing was performed with parameters such as with a minimum of lighting intensity from without lighting, low lighting and bright lighting, a minimum of distance from 50 cm, 100 cm, and 150 cm, a minimum of height from 60 cm,120 cm,160 cm, and a minimum of angle from 30,50 and 70 degree of detection from the surface of the floor. The result of this research is the Simultaneous Localization and Mapping method is confirmed to be adequate for visualizing the 3D furniture model on targeted the surface of the floor without markers.
Optimization of elderly nutrition needs using PSO algorithm: A case study at POSBINDU PTM Sejahtera
Authors: Rizqullah R , Permana S D H , Yaddarabullah Y 
Published: March 2021

Abstract
POSBINDU PTM Sejahtera is a health post that aims to increase awareness of the elderly in preventing non-communicable diseases. According to Departemen Kesehatan, this disease can be caused by food consumption. The food consumed must include vegetables and fruit to enhance the concept of active aging. However, these recommendations are not comparable with the POSBINDU PTM screening data. Screening data mentioned that only 3.5% of 73 elderly people consume vegetables and fruit three times a day. Factors that inhibit the elderly in consuming healthy food are the officers only giving food abstinence advice and expensive food staples. The problem of this optimization model can be solved by the artificial intelligence algorithm, Particle Swarm Optimization (PSO). The results of this study, PSO can provide varied food recommendations at a minimal price (optimization model). The calorie and carbohydrate content gets a value of <10% of the nutritional needs of the elderly, while the protein and fat content produce a greater difference of > 10%. The average price of foodstuffs produced by the PSO algorithm is Rp.50,965.
Effect of loss water during vibrations on the compressive strength of concrete fc’ 21.7 Mpa
Authors: Roding V L , Candra A I , Karisma D A , Laksono T A , Ansori A , Sudarsono S , Vaysyad A , Hidiyati E F 
Published: March 2021

Abstract
Concrete is an important material in construction because it is necessary to improve the quality of concrete. One of the quality of concrete is influenced by the presence of air cavities in the concrete. The air cavity in concrete can be reduced by vibrating. The vibrating air cavity in the concrete will rise to the surface in the form of water. The purpose of this study was to determine the effect of the amount of water that rises to the surface as a result of vibrations on the concrete compressive strength of fc’21.7 MPa. The method used in this research is the experimental method and the study of previous research theories. Vibration uses an external vibration method with the acceleration of 180 m/s2, variation velocity 160 mm/s, and displacement of 1000 mm. The time variations used are 1 minute, 2 minutes, and 3 minutes. The specimen is cylindrical, with a diameter of 15 cm and a height of 30 cm. The results showed the highest amount of water that was on the surface contained in the vibration with a time of 3 minutes with a compressive strength of 23.35 MPa and water content 0.78 gr.
Contribution of terrestrial material in West Sulawesi based on geochemical and biostratigraphy analysis
Authors: Sutadiwiria Y , Syavitri D , Yeftamikha Y 
Published: March 2021

AbstractThe LYS and KYS exploration wells were drilled in the north and south of the Bdg Block, onshore West Sulawesi, Indonesia. Geochemical analysis, especially gas chromatography and gas chromatography/mass spectrometry, was conducted on cutting samples of LYS and KYS wells. The existing biostratigraphy analysis shows that LYS samples are in the marine environment (outer neritic-upper bathyal) with age of Late Miocene-Pleistocene, while KYS samples are also in the marine environment (inner neritic-batial) with age of Middle Eocene-Early Pliocene. There are few terrestrial materials found, such as oleanane, bicadinane, taraxastane, and gammacerane, that indicates only a small amount of terrestrial material that was moved to the marine environment. The high oleanane/C30hopane ratio in both wells showed the contribution of higher plants. There are variations in the value of the oleanane/C30hopane ratio in KYS samples at Neogene (Middle-Late Miocene). The ternary diagram shows abundance of sterane (C27, C28, and C29) with marine organic material input, followed by contribution from terrestrial material, and deposited in the marine environment. High concentration of higher plant biomarkers in Neogene compared to in Paleogene indicates depositional environment changes from lacustrine and shallow marine to deep water and also affected by greater abundance of angiosperm plants during Neogene.
Non-linear regression approach to ROP predicted in Geothermal well aerated-drilling at Field X, South Sumatera, Indonesia
Authors: Sriwijaya S A , Fathaddin M T 
Published: March 2021

Abstract
Rate of penetration is one of the most significant drilling parameters for optimizing the cost of drilling geothermal wells. Many drilling variables affect the rate of penetration. Several correlations have been introduced to predict rate of penetration by involving some of the variables. In this study, a new empirical correlation based on an optimized nonlinear regression model was developed to predict ROP. Several drilling variables i.e. weight on bit, rotation-per minute, compressed air flowrate, true vertical depth, hole diameter, and foam flowrate were included into the correlation. SPSS (Statistical Product and Service Solutions) Software was applied to generate eight equations. The most appropriate equation was selected by comparing the calculated and measured ROP. The selected equation has average percentage difference of 14.6%. In addition, the procedure can be applied to estimate the effect of drilling variables on the accuracy of the model.
Effect of temperature and time of carbonization on coal-based activated carbon adsorption
Authors: Suliestyah S , Sari I P 
Published: March 2021

Abstract
Coal from Bangko, South Sumatra is a low rank coal which has the potential to be used as activated carbon material. The result of proximate analysis and calorific value of coal shows that Bangko coal is included in the lignite category, with fixed carbon 43.58%, volatile matter 41.1% and calorific value 4915 Cal/g. Synthesis of activated carbon from lignite coal was carried out through the carbonization and activation. Carbonization was carried out at several temperature variations, between 400°C-900°C for 2 hours using airtight steel box under non-oxidizing conditions. While the activation has taken place at 900°C for 60, 90 and 120 minutes using water vapour as an activator. The activated carbon iodine number was determined as an indicator of the coal absorption capacity and its porosity. Synthesized activated carbon at 900oC and 120 minutes shows the highest iodine number, 1274.8 mg / g. This activated carbon has 76.78% fixed carbon, 10.65% volatile matter, 5.91% moisture content and 6.66% ash content. Based on the result, we were concluded that low rank coal like lignite was the potential material to produce coal based activated carbon with high capacity adsorption.
The effect of middle phase emulsion and interfacial tension of Sodium Lignosulfonate surfactant synthesized from bagasse to Enhanced Oil Recovery
Authors: Fattahanisa A , Setiati R , Ristawati A , Siregar S , Marhaendrajana T , Wahyuningrum D 
Published: March 2021

Abstract
Enhanced Oil Recovery (EOR) is an effort to increase oil recovery after primary recovery and secondary recovery. One method used is chemical injection using surfactants. Sodium Lignosulfonate (SLS) is one of the anionic surfactants commonly used in the EOR process. Sodium Lignosulfonate can be made by bagasse synthesis, as an alternative to the use of lignosulfonate surfactant. The purpose of this study was to determine the effect of the middle phase emulsion and interfacial tension on the recovery factor results. The method used is the core injection. The injection fluid used is Sodium Lignosulfonate surfactant which has been tested for its characteristics. This research uses core flood devices and synthesized Berea cores. Core injection is carried out in several variations of salinity and surfactant concentration. The results of the study show that the largest recovery result is at 1.5% 15000 ppm with a recovery factor of 5.34% where the emulsions are the least among other compositions but the emulsions are stable at 48 hours and the IFT value is also relatively low at 4.34 mN/m. The lowest recovery results are at 1.5% 4000 ppm with a recovery factor of 3.24% where the emulsions are highest but the emulsions are stable at 336 hours, and the IFT value is relatively high at 10.40 mN / m. Based on this study it can be concluded that if the middle phase emulsion is quickly stable and the IFT value is low it will result in enhanced oil recovery.
Characteristics of wood powder, coconut fiber and green mussel shell composite for motorcycle centrifugal clutch pads
Authors: Kholil A , Dwiyati S T , Riyadi R , Siregar J P , Yoga N G , Aji A I 
Published: March 2021

Abstract
This research is motivated by the need for environmentally friendly motorcycle centrifugal clutch pads. Utilization composites of wood powder, coconut fiber, and green mussel shells for centrifugal clutch pads have not been much discussed in the research. Centrifugal clutch functions to transmit power from the engine to the drive train with a centrifugal force mechanism. This study aims to determine the characteristics of the hardness, wear, coefficient of friction, and microstructure of the composite. Composite material was made with three variations, namely specimen 1 consisting of 20% wood powder, 20% coconut fiber, 60% resin, and 0% shells. Specimen 2 made of 20% wood powder, 20% coconut fiber, 50% resin, and 10% shells. Specimen 3 is made from 20% wood powder, 20% coconut fiber, 40% resin, and 20% shells. All specimens were characterized by hardness testing according to ASTM E92 by the Vickers FV-300e. Each specimen was tested three times and the average data was taken. Wear resistance testing according to ASTM G99 by OGOSHI machine. Friction coefficient testing is based on the principle of friction in the inclined plane. While microstructure testing uses SEM by JEOL JSM-6510LA. The results shows that the composition of wood powder, coconut fiber, and shell influenced the test results. Specimen 3 shows the highest value of hardness, wear and coefficient of friction compared to others so that it can be used for the centrifugal clutch.
Tunnel Hydraulic Fracturing evaluation and comparing with conventional hydraulic fracturing computation
Authors: Oetomo H K , Sulistyanto D , Romli M , Veronica V , Sunjaya R S P 
Published: March 2021

Abstract
Tunnel Hydraulic Fracturing is one method of well fracturing operation which generates tunnel in proppant filled fractured rock, near wellbore. The tunnels are in-between packs of proppant. The occurrence of tunnel is caused by certain pumping technique during hydraulic fracturing operation. Frac fluid is pumped continuously, along with proppant is pumped intermittently. These tunnels generate high conductivity media in the fracturing geometry. The subject well was initially flow tested intermittently with 95% to 100% oil cut. The permeability from log correlations is 8 mD, with 1824 Psireservoir pressure, from surrounding wells. Rock mechanic and type of stresses were evaluated to determine tunnel fracturing candidacy. After designing Tunnel Fracturing Design, operationally Pre-fracturing test sequences was executed, which is followed by re-design and operation of Mini frac test. The final design is followed by performing pulsed Mainfrac. The Tunnel Fracturing geometry was computed by service provider software, and the Productivity Index PI by spreadsheet. The Conventional Fracturing and its PI was computed by using spreadsheet. The Tunnel Hydraulic FracturingPI was as much as 4.22 while Conventional Fracturing was 2.05.
Comparison of Permanent Magnetic Motor and Induction Motor on power efficiency in Electric Submersible Pump
Authors: Sulistyanto D , Oetomo H K , Pramadika H , Ziad Z , Putra Y N H 
Published: March 2021

Abstract
Artificial Lift is utilized to produce oil from a well with no natural flow or to increase the oil production of naturally flow well. One method for artificial lift is the installation of Electric Submersible Pump or ESP. ESP is the most common method and widely used to lift oil from a well. The downhole equipment of the ESP, from bottom, consists of motor, protector, gas separator if needed, and the pump itself. Designing ESP includes selecting the right motor to be installed which is suitable for the pump. Presently, there is more efficient motor technology invented and available in the market. The motor is called Permanent Magnetic Motor or PMM. The conventional motor; Induction Motor or IM; the rotor of the motor consists of electrified copper bar, to induce magnet; while in the PMM motor, the rotor consists of permanent magnet. used is Induction Motor. In this study, the PMM has higher power efficiency, higher and stable power factor, and wider and stable operating speed than IM. The power efficiency of PMM motors is up to 90%, while for IM is only up to 85%.
Water wall tubes failure analysis in a 25-megawatt steam power plant
Authors: Sitanggang R B , Nugraha A D 
Published: March 2021

Abstract
The failure of water wall tubes in a boiler steam power plant has been analysed. When the first inspection was conducted on the 25-Megawatt steam power plant, leakage was found on several water wall circulating fluidized boiler (CFB) tube. Visual examination, chemical composition analysis, hardness measurement, and metallographic examination on the tube samples cut from the water wall were used to analyse the cause of the failure. Visual examination showed that there is a thick weld joint on the tube inner side that could induce overheat and cause the tube to fracture and, in some locations, there were thick deposits on the tube inner side. A Hardness measurement of the tube near the fracture location showed an increase in the hardness value ranged from 191 – 206 HV. Metallographic examinations showed that there has been some micro-crack along the grain boundary. Composition analysis on the deposit at the inner side of the tube showed a trace of magnesium and calcium indicate that the water quality of the boiler doesn’t meet the standard. To resolve the problem, it is recommended to fix the weld procedure and kept the water quality to meet the standards.
Synthesis and characterization of composite magnetite-bentonite from Indonesian local minerals
Authors: Moersilah M , Rahman A , Alanas E , Yuliani Y , Rosmalia R 
Published: March 2021

Abstract
The use of modified natural materials as adsorbents has been widely reported. In this study, synthesize, and characterization of magnetite-bentonite composite composites from local Indonesian minerals was reported. Composites are synthesized by inserting iron ion into the bentonite layers with a mole ratio of 1: 1 Fe2+/Fe3+ ion; 1: 1.5; and 1: 2, hereinafter referred to as composite A, composite B, and composite C respectively. All composites were then calcined at a temperature of 400°C for 1 hour. The iron oxide formed in the area between bentonite layers has a magnetite structure and has high thermal stability. This can be seen from the diffraction pattern obtained from XRD analysis. The specific surface area of the composite also increased compared to pure bentonite. Before being modified, pure bentonite had a surface area of 47.824 m2/g, and after the insertion of iron oxide, there was an increase. Composite A is 87.482 m2/g composite B is 83.774 m2/g, and composite C is 98.336 m2/g.
Effect of dietary black soldier fly larvae (Hermetia illucens) and bioconversion product of cocoa pod husk on performance and hematological profile of sheep
Authors: Rahman R , Laconi E B , Jayanegara A , Astuti D A 
Published: March 2021

Abstract
Bioconversion of cocoa pod husk (CPH) is a biological processing technique using black soldier fly (BSF) larvae to improve the quality of the CPH while being able to produce added value in the form of BSF larvae as a protein source of animal feed. The aim of this study was to evaluate in vivo complete feeds containing BSF larvae and bioconversion product of CPH on performance and hematological profile of sheep. This study used a randomized complete block design (RCBD) with 5 treatments and 4 replications, so that total number of sheep used were 20 heads, conducted for 12 weeks period. The treatments were: R1 (complete feed, control without BSF and bioconverted CPH), R2 (5% BSF), R3 (20% bioconverted CPH), R4 (2.5% BSF + 10% bioconverted CPH), and R5 (5% BSF + 20% bioconverted CPH). The BSF and bioconverted CPH were used to replace soybean meal and coffee husk, respectively. Data were analyzed by analysis of variance and continued with a post-hoc Duncan’s test. Results revealed that replacement of soybean meal with BSF larvae and replacement of coffee husk with bioconverted CPH in the complete feed did not significantly affect performance of sheep, i.e., live weight gain, feed consumption and feed conversion ratio). Furthermore, different dietary treatments showed similar response on hematological profile of sheep. It can be concluded that BSF larvae and bioconverted CPH may be used to replace soybean meal and coffee husk, respectively, without any adverse effects on performance and hematological profile of sheep.
Carrying capacity of environment to the life potential of Rafflesia (Rafflesia patma Blume) in Leuweung Sancang Nature Reserve Garut West Java
Authors: Amalia L , Nursifa A S , Putri D I , Kristianti T 
Published: March 2021

Abstract
This research aims to determine the condition of vegetation around the Rafflesia environment, conditions and population of Rafflesia host, condition and population of Rafflesia, and environmental characteristics of abiotic component in Leuweung Sancang Nature Reserve. The method used is a quantitative descriptive method with a purposive sampling technique in which 4 circle plots of 0.1 Ha are made. The results showed that vegetation around Rafflesia’s environment was dominated by Ki Kopi (Tarenna polycarpa) on tree vegetation, Ki Barera (Tetrastigma leucostaphylum Dennst) on sapling vegetation, and Pereng (Ficus sp) on seedling vegetation. Species diversity is quite abundant (1.027) with species richness is classified as moderate (3.833) and species evenness is high (1.585). The host of Rafflesia, Ki Barera (Tetrastigma leucostaphylum Dennst) was found as many as 9 trees with an average diameter of 4-15 cm. Rafflesia is overgrown on the roots of the top soil and stems. Found 34 knobs of Rafflesia with a mortality rate of 38.24% which is relatively low. Abiotic environmental conditions are very supportive of Rafflesia’s life. Thus the biotic and abiotic environment in Cipalawah block of Leuweung Sancang Nature Reserve supports the life potential of Rafflesia patma Blume.
Isolation and characterization of Cellulose Nanofiber from Subang Pineapple Leaf Fiber waste produced using Ultrafine Grinding method
Authors: Amirulhakim H , Juwono A L , Roseno S 
Published: March 2021

Abstract
Pineapple leaf fiber (PALF) is one of natural fibres that has high cellulose content. However, pineapple plants must be replaced with new plants once it is harvested, leaving the leaves as waste. In this research, the isolation and characterization of Subang based PALF were conducted. Chemical pre-treatments including alkaline treatment with Sodium Hydroxide and bleaching to remove nanocellulosic constituents such as lignin and hemicellulose were conducted. This process was followed by mechanical treatment using ultrafine grinder to produce cellulose nanofiber (CNF). Transmission Electron Microscopy (TEM) images showed that the CNF had 45-75 nm in diameters. The percentage crystallinity was determined by X-ray diffraction (XRD). The crystallinity values of raw PALF, treated PALF, and CNF were 74.97%, 76,29%, and 69.52% respectively. Fourier Transform Infrared (FTIR) spectroscopy analysis was carried out to investigate the chemical structure changes after both chemical and mechanical treatments. The presence of a peak that related to cellulose confirmed that the process was well conducted. These results indicated that PALF waste could become added value to agricultural waste and expected to become reinforcement agent in nanocomposite for structural application since PALF had low aspect ratio and had high percentage crystallinity values.
Enhanced performance of UV photodetector of MoS2 quantum dots-decorated ZnO nanorods
Authors: Putri N A , Fauzia V , Isnaeni I , Lewa I , Imawan C 
Published: March 2021

Abstract
Two-dimensional transition metal dichalcogenides such as molybdenum disulfide (MoS2) have attracted great attention due to their unique optical, electrical and chemical properties. MoS2 quantum dots (QDs) exhibit strong quantum confinement, high surface area and notable active edge sites compared to their bulk. In this work, MoS2 QDs were attached on the surface of ZnO nanorods (NRs) grown on interdigitated ITO substrates and then used as photodetector. MoS2 QDs were synthesized by a new ultrafast way pulsed laser ablation (PLA) in liquid method and then spincoated on the surface of ZnO NRs. The pristine ZnO and ZnO/MoS2 QDs photodetector were investigated under UV and visible light (325 nm, 505 nm and 635 nm) with the bias voltage -5 V to 5 V. The results show that the decoration of ZnO NRs by MoS2 QDs could enhance the sensitivity, responsivity and detectivity under UV irradiation. This may due to the decrease of dark current as the result of passivation of surface defects of ZnO NRs by MoS2 QDs.
Characterizations of Streptococcus agalactiae from subclinical mastitis cases in dairy cow
Authors: Tuasikal B J , Handayani T , Priyoatmojo D , Trinugraha A C , Tjiptosumirat T 
Published: March 2021

Abstract
Subclinical mastitis (SCM) is a disease that often infects dairy cow, which then reduce milk production. Streptococcus agalactiae is well known as a dominant causative agent of SCM. An experiment to identify S. agalactiae from subclinical mastitis cases in dairy cows has been conducted. These isolates were examined using presumptive S. agalactiae of Christie, Atkins, and Munch-Petersen (CAMP) test and followed by Grouping test to identified it, which was cultured in soft agar (SA) and serum soft agar (SSA) to observed the capability at surface phenotype expression. Haemagglutination test of these isolates were used 1% cow erythrocyte. Fifty-seven positive Gram and negative catalase of cocci bacteria were isolated from the process of identification, of which 34 were CAMP positive. From the grouping test of these, 14 isolates of S. agalactiae Group B (SGB) were identified. Furthermore, 8 isolates are diffuse cultured in SA, while the remain 6 isolates are compact in SSA. Noncapsulated SGB with antigenic side would be expressed as compact culture in SA and SSA. Haemaglutynine (Hn+) property of SGB have a role in adhesive process at epithelial of mamary gland alveolus.