bluuebunny/crossref_metadata_2025_split huggingface dataset:
Preparation and photocatalytic activity of hematite from iron sand modified ZnO for indigo carmine degradation
Authors: Lubis S , Maulana I , Sheilatina S , Mahyuni L 
Published: December 2019

Abstract
Modification of hematite (α-Fe2O3) with ZnO to produce ZnO/α-Fe2O3 composites by sol gel method and their photocatalytic activity testing on the degradation of indigo carmine (IC) dye has been done. The hematite was extracted from iron sand using hydrochloric acid and precipitated using aqueous ammonia. The ZnO/α-Fe2O3 composites were prepared with the mole ratio of ZnO to α-Fe2O3 1:1, 1:5 and 5:1. XRD pattern analysis showed that the average crystallite size of ZnO/α-Fe2O3 composites were greater than that of α-Fe2O3. The result of photocatalytic activity test showed that composite with the mole ratio of ZnO to α-Fe2O3 1:5 has the highest photocatalytic activity under the optimized conditions, with the maximum degradation efficiency of IC are 91.75 % and 93.18 % under UV light and sunlight irradiation, respectively. These highest of photocatalytic activity was reached at the initial pH of dye solution = 1, photocatalyst dosage of 300 mg, initial dye concentration 15 ppm and irradiation time 120 minutes under UV light and 90 minutes under sunlight irradiation.
Effect of blanching pre-treatment on colour and anthocyanin of dried slice purple sweet potato (Ipomoea batatas L)
Authors: Mahmudatussa’adah A , Patriasih R , Maulani R R , Nurani A S 
Published: December 2019

Abstract
Purple sweet potato (Ipomoea batatas L) contains many acylated anthocyanins which are beneficial for human health. Purple sweet potato roots are easily damaged due to the high water and nutrient content. To extend the shelf life of purple sweet potatoes can be done by a drying process. The drying process can affect the colour and amount of anthocyanin. The purpose of this study was to analyse the effect of blanching on colour and the amount of anthocyanin of dried slice purple sweet potato. The blanching method studied was steam blanching with a temperature of 70°C-80°C and blanch with boiling water 90°C – 98°C for 2 minutes. To measure the amount of anthocyanin by the pH difference method and measure colour using the chromameter. The results showed that the steam blanching technique produced a higher colour and amount of anthocyanin of dried chips purple sweet potato compared to blanching boiling water. This is because Anthocyanin dissolves in water. The conclusion is to get the colour and the relatively high amount of anthocyanin in dried pieces of purple sweet potato can be done by steam blanching. The implication to prevent browning process when making dried slice purple sweet potato can do steam blanching.
Screening of the drought tolerant phosphate solubilizing bacteria in dissolving P-inorganic
Authors: Susilowati L E , Kusumo B H , Arifin Z 
Published: December 2019

Abstract
The drought tolerant phosphate solubilizing bacteria is needed to dissolve inorganic phosphate (P) which is usually low in the availability at dry land. This study is aimed to obtain a combination of drought tolerant phosphate solubilizing bacteria which has high potential in dissolving P-inorganic. An experimental study which has 4 treatments of bacterial combinations has been conducted in a laboratory. The first treatment was the combination between Pseudomonas azotoformans (A) and Acinetobacter baumannii (B). The second treatment was the combination of A and Bacillus paramycoides (C). The third treatment was B and C, then the fourth treatment was A, B, and C. The potential of the bacterial combination in dissolving P-inorganic was measured qualitatively using phosphate solubilizing index (PSI) on pikovskaya solid medium. While, the potential of the bacterial combination in dissolving P-inorganic was measured quantitatively by measuring dissolved P using the ascorbic acid method in pikovskaya liquid medium containing 0.5% Ca3(PO4)2. The results showed that the combination of those three bacteria (A B and C) has the best potential to dissolve P-inorganic compared to other combinations. In addition, the three bacteria combination also resulted in the highest dissolved P with 0.29% potential dissolution of the total Ca3(PO4)2 contained in the pikovskaya liquid medium, followed by combination of B and C (0.19%), and A and C (0.18%), respectively. Thus, before the combination of these three bacteria is applied in soil, it is needed further experiment of the potential of the bacteria in dissolving soil P-inorganic.
Antioxidant activity from ethanol extract of kupa leaves (Syzygium polycephalum(Miq.) Merr& L. M.Perry) using DPPH (2,2-diphenyl-1-picrylhydrazil) method
Authors: Perdana F , Martiani I , Dhanti D 
Published: December 2019

Abstract
Kupa is one of the endemic plants from Indonesia belong to guava family (Myrtaceae). This research conducted to determine antioxidant activity of kupa leaves (Syzygiumpolycephalum (Miq.) Merr& L. M. Perry) ethanol extract. Extraction of kupa leaves was carried out by maceration method using ethanol 96%. The antioxidant activity test was done qualitatively and quantitatively. The qualitative antioxidant test was carried out by Thin Layer Chromatography (TLC) using mobile phase chloroform: methanol: formic acid (8: 2: 1) and DPPH 0.2% spotting appearance. Quantitative testing of antioxidant was carried out using DPPH (2,2-diphenyl-1-picrylhydrazil) assays. The TLC test results showed yellow spot on the DPPH with Rf value 0.381. Kupa leaves ethanol extract had the lowest IC50 of DPPH scavenging activity 10.327 ppm which was a very strong antioxidant.
Formulation and evaluation of body splash from Java preanger Arabica coffee (Coffea arabica L.) oil
Authors: Handayani R , Auliasari N , Oktaviany T K , Hindun S , Sriarumtias F F 
Published: December 2019

Abstract
Java preanger Arabica coffee (Coffea arabica L.) is a distinctive coffee from Priangan having special property as a natural fragrance. The essential oil in java preanger arabica coffee (Coffea arabica L.) beans contains Abhexon, Furaneol, Sotolon, and Pentandion. The purpose of this study was to find out the percentage of the coffee extract concentration contributes to a good fragrance and how to formulate a safe and stable body splash preparation. The research began with material collection, determination, coffee roasting production, soxletation with ether solvents, dosage formulations with one percent, three percent, and six percent concentrations and evaluations including organoleptic test, pH, viscosity, quality test of the body splash preparations (spreadability, endurance, spot, and adhesion tests), irritation test, sharpness test and preference test. The results showed that the formula with the three percent Java preanger Arabica coffee (Coffea arabica L.) oil concentration was a safe, stable and the scent was favored because it was not too strong and left no stains.
Formulation and evaluation fast disintegrating film salbutamol sulfat using HPMC E15
Authors: Nurhabibah N , Sriarumtias F F , Fauziah S , Auliasari N , Hindun S 
Published: December 2019

Abstract
The aim of the study was to formulate and evaluate Fast Disintegrating Film salbutamol sulfate with HPMC E15 polymer using a solvent casting method. FDF salbutamol sulphate preparations with variations oaaf HPMC E15 polymer concentration (F1 = 30%, F2 = 40%, F3 = 50% and F4 = 60%). Film of salbutamol sulphate was evaluated organoleptic, thickness, uniformity of weight, folding endurance, PH surface, moisture loss, moisture uptake and in vitro disintegration time. The result showed that film of salbutamol sulphate produce flexible and semi-transparent films. Evaluation results of thickness, weight, folding endurance, surface pH, moisture loss and moisture uptake and film disintegration time of all formulas met the requirements, except the uniformity of weight at F4, time of disintegration of F1, F2, F3 and F4 because high concentration of polymer and not added surfactant and superdisintegrant.
Graphite surface profile with different polishing treatment
Authors: Budiman B A , Sambegoro P , Halimah P N 
Published: December 2019

Abstract
Graphite is a fascinating material to study in nanotechnology. Surface profile and roughness of the graphite are some of the most important parameters to determine many physical and mechanical behaviors including friction or bonding condition. To acquire certain surface profile, mechanical polishing treatment is one of the easiest ways that can be applied. In this work, graphite is polished by three different grades of sandpapers (P800, P400, and P220) and cellulose-based paper. The surface properties are observed by a laser microscope and various surface roughness parameters were quantified. The sequential polishing process employed in this work is able to modify the surface roughness and might improve the physical properties. This work sheds light on the importance of the mechanical surface treatment on graphite.
Characteristics composite of wood powder, coconut fiber and green mussel shell for electric motorcycle brake pads
Authors: Kholil A , Dwiyati S T , Sugiharto A , Sugita I W 
Published: December 2019

Abstract
The brake pads mostly consist of asbestos fiber with polymeric matrix and other ingredients. The use of asbestos fiber is been avoided due to its carcinogenic nature. The main purpose of this study was to determine characteristics of the composite made from wood powder, coconut fiber, and green mussel shell that will be used for electric motorcycle brake pads. Composites were made with three variations. Specimen A consisted of 30% wood powder, 10% coconut fiber, 10% green mussel shell and 50% polyester resin. Specimen B consisted of 20% wood powder, 20% coconut fiber, 10% green mussel shell and 50% polyester resin. Specimen C consists of 10% wood powder, 30% coconut fiber, 10% green mussel shell and 50% polyester resin. All specimens were characterized by hardness testing according to ASTM E 92 by Vickers FV-300e test equipment. Each specimen was tested three times and taken data-average. Decomposition testing used TGA NETZSCH TG 209F3. The results of the characterization were compared with commercial brake pads. Specimens with the closest characteristics to the commercial brakes were shown by specimens A with 33.1 VHN and decomposition temperature 90 °C.
Analysis of jacket pile failure at breasting dolphin pile on berthing dolphin system
Authors: Hakim B L , Subawi H , Taptajani D S , Ikhwana A , Chandrahadinata D 
Published: December 2019

Abstract
The study evaluated the structural damage of the jetty pile jacket due to the impact load within operation days. The pile jackets on breasting dolphin (BD) were destroyed in front of pneumatic floating fender or leaning back direction. It observed that the failure was due to an impact load perpendicular to the pile and shear load between the floating fender and the pile jacket. The polyolefin material for pile jacket is not designed to hold any impact load from pneumatic fender vertically during docking. The pile jacket was installed to protect against to corrosion attack between tidal and splash zone. While the coal barge is docking on the jetty, the floating fender will crash and push the pile jacket by impact load at about 13.88 ton.m and swing press perpendicular to the breasting dolphin pile or shear load vertically. The installation of rack fender may practically protect the breasting dolphin pile and to back up currently pneumatically floating fender and the jacket pile.
Analysis of determining deliverability test and transient pressure in the PW-02 Well of Alpha Fields by using Ecrin software
Authors: Wijayanti P , Said L , Singh P J 
Published: December 2019

Abstract
Quantitative analysis of reservoir properties in a well is determined by transient pressure analysis. Transient pressure according to its type consists of Pressure Build up and Pressure Draw Down. this analysis provides an overview of the characteristics of a reservoir. This analysis includes the process of determining drainage area, shape, heterogeneity, porosity, average pressure, skin, permeability, and distance from a reservoir to boundary or flow discontinuities. This test is to determine the ability of gas production in the PW-02 Well, carried out by using the Modified Isochronal test method. This test aims to determine the productivity of a potential (Absolute Open flow). Transient pressure test on PW-02 Well using the Pressure Build up Test (Type Curve Pressure Derivative) method, it is found that the well model is Vertical well and the reservoir model is Two porosity PSS. While the boundary model obtained is Rectangle. Then, the data obtained in the form of positive skin is 1.46, the permeability is 62.5 mD and the reservoir pressure is 2529.32 psia. Based on the analysis obtained Absolute Open Flow Potential (AOFP) is 117406 mscf/D. While the deliverability test value obtained is 117413 mscf/D with n value of 0.825.
Effect of Salt quenching on the microstructures and mechanical properties of AISI 1045 steel
Authors: Basori I , Pratiwi W D , Dwiyati S T 
Published: December 2019

Abstract
Steel has a very important role in the industrial applications, especially for the manufacture of automotive components such as gear. In its applications, gear undergoes the compressive and friction loads, so that in the manufacturing process, materials with high hardness and wear resistance are needed. One method to increase steel hardness is by quenching process. In this research, quenching process will be carried out on AISI 1045 steel using pure water and the salt solution as the cooling medium. The austenization process was conducted at a temperature of 850 ° C with the holding time of 15 and 30 minutes. The samples were then quenched at the cooling medium of salt solution with concentration of 0, 10 and 23%. The results showed that the quenching process on AISI 1045 steel promotes the phase transformation from mixture of ferrite and pearlite to be martensite. The increase of austenization holding time and salt concentration level resulted in higher martensite intensity and hardness. In contrast, the increase of austenization holding time and salt concentration level resulted in lower toughness.
Laboratory study on the addition of banana midrib and kwikseal as LCM to the physical properties of mud at high temperature
Authors: Pauhesti P , Hamid A , Anggoro C A 
Published: December 2019

AbstractDrilling mud is a very important role in drilling operations, start over drilling until reaches the depth of the intended. In the importance of drilling mud, therefore there should have an analysis of potential problems that might happen in the process of the drilling, one of them is about the lost circulation. One of the ways to overcome the loss of drilling mud is to use LCM (Lost Circulation Material). In this study used Kwikseal and Banana Midrib as an ingredient LCM. Both of these materials into the fibrous material categories that have a little stiff texture so as inhibit the lost circulation in a way in the forced entry into the cracks and can clog the pores and close it to be able to cope with the onset of the lost circulation problem. In research was done three times experiment with the additional kwikseal and adding banana midrib. The results of the research are expected us to know how much composition kwikseal or banana midrib to be added to the mud and effective to overcome lost circulation. From the overall results obtained that the LCM Kwikseal has a better effect than the LCM Banana Midrib to reduce fluid loss at temperatures above 250°F.
Application hall plot method for surveillance waterflood in oil reservoir
Authors: Dalimunthe Y K , Hanifah A , Setiati R 
Published: December 2019

Abstract
Pattern X is one of the patterns in Field Z which is 60 km west of Prabumulih, South Sumatra, where the full-scale waterflood is implemented. In general, the pattern used is an irregular inverted 5-spot where there are six production wells namely Z-091, Z-098, Z-110, Z-157, Z-195, and Z-233 and one injection well namely Z-227. Waterflood is a secondary recovery method by injecting water into the reservoir. Waterflood surveillance analysis was carried out to determine the conditions around the production and injection wells during waterflood. Surveillance analysis is used as a measure of success in waterflood activities. One of the methods that used is the Hall Plot method. It is obtained a slope which moves upward where displacement is moved normally or stable. However, over time there is an increase in the slope of the tilt where skin changes occur. In fact, the slope that occurs due to the installation of Multilayer Packer is used to adjust the desired injection rate. In the end, the injection results have no problems and run stable.
Application of pressure build up analysis for reservoir oil
Authors: Sunardi A H , Setiati R , Samsol S 
Published: December 2019

Abstract
The well analysed in this paper is A-1 well, T field, located approximately 90 km north of Bali. Reservoir in this field is gas reservoir with sandstone rock formation, one of the problems of A-1 well is sand problem. Due to the sand problem in well A-1, well test analysis must be done first, to see if there is any damage to the formation if the flow rate is increased. Identification of formation damage in a well can be done by doing Pressure Build up test. The method used is pressure build up test by Horner method with Sapphire software v.3.20. The determination of deliverability test was conducted by back pressure test. Given the results of the analysis, the permeability value remains, the value of the skin and reservoir pressure decreased. From the results of the tests, there were no significant changes, indicating no formation damage. The results of the deliverability tests decrease, due to decreased reservoir pressure. Since there is no formation damage, the flow rate can still be increased up to 30% of AOFP.
Comparison between import and local product of Koma material for hardness and microstructure
Authors: Tjahjanti P H , Wicaksono A D , Akbar A , Ganda A N F 
Published: December 2019

Abstract
Koma material is one of the wire cutting machine part from PT. X in Indonesia, which has a function as a wire straightening device that will be processed or cut. This material is made from white cast iron and is obtained from imports. Never tried to make the local product. The aim of the research is making Koma material from white cast iron. The method is used to make Koma material which has a quality similar to imported products. The prepared material later will be tested using hardness testing and optical microscope measurement for observing its microstructure. The results are compared with Koma imported products show that Koma material of imported products has a higher hardness than local products, due to the differences content in chemical elements in the white cast iron.
Size dependencies on melting of Gold nanoparticle: A Molecular Dynamics study
Authors: Fahdiran R , Handoko E , Sugihartono I 
Published: December 2019

Abstract
We study the size dependencies on melting of Gold nanoparticle. The nanoparticles are built with different sizes and heated up with same temperature gradient from room temperature up to 1400 K. The trajectories of the atoms are investigated based on Molecular Dynamics (MD) simulation. Pressure evolution as a function of time shows the oscillation pattern as in the case of thermal induced melting. Analysis based on structure factor combined with Common Neighbour Analysis (CNA) indicated the properties of melting depends on nanoparticle sizes.
Fourier Transformed Infrared (FTIR) spectroscopy for analysis of cholesteryl acrylate liquid crystall-indium tin oxide composites
Authors: Afrizal A , Rahman A , Florencia F V , Jati L 
Published: December 2019

Abstract
The aim of this research is to synthesis composites and polymerizations of cholesteryl acrylate with dopan of Indium Tin Oxide (ITO). Composite of cholesteryl acrylate-ITO was made by using casting solution technique at 75°C for 30 minutes. Monomer cholesteryl acrylate and ITO have succeeded in becoming a composite with blending process in variations concentrations of ITO. The photopolymerization process by UV curing method with variation of UV lamp power that is 10, 25, 40 and 55 watt. Analysis of functional group with FTIR showed vibration of In-OH bond with C-O at wave number 1056,99 cm−1. Other peak in wave number 2929,87 cm−1 for vibration of groups in bond C-H in vinyl, wave number at 2860,01 cm−1 for vibration bond of C-H alyfatic. Spectrum FTIR of ITO showed at wave numbers: 437,84; 487,99; 534,28; 619,15 cm−1. Therefore, after photopolymerizations process, peak at 2100 cm−1 has disappeared in spectrum FTIR of Cholesteryl acrylate which showed molecule of cholesteryl acrylate had polymerized. Conductivity of composite of cholesteryl acrylate-ITO was determined using by LCR meter. In general conductivity value and permittivity of composite of cholesteryl acrylate-ITO increase with the increasing of the concentration of dopan ITO was added to the composites. SEM images of composite of cholesteryl acrylate-ITO show that pores of cholesteryl acrylate had been filled by ITO particles. The SEM-EDX data show that the content of the elements contained in the composite cholesteryl acrylate-ITO are: C 76.91%, O 3.13% and In 5.13%. The value conductivity (σ) of composite of cholesteryl acrylate-ITO is 4.078 x 10−10S/m, therefore polymer of cholesteryl acrylate-ITO of σ is 11.2 x 10−10S/m.
Temperature dependence of the mechanical behavior of ZnO-Na2O-P2O5 glasses
Authors: Budi A S , Mujadi M 
Published: December 2019

Abstract
In this research, we investigate the mechanical behaviour of zinc sodium phosphate glass system with the various concentration of chromium oxide doped. The glass system was synthesized using the melt quenching technique. The concentration of chromium oxide varying from 0.5% to 2.5%. The ultrasonic wave velocities have been determined as functions of temperature from 273 K and 333 K. The transit time data and density are used to determine all of the mechanical behavior for these glasses, we found that the mechanical behaviour of the glass system decrease as the Cr2O3 content increase, which indicates a weakening of the binding energy in the network.
Structure, microstructure, electrical transport mechanism and magnetoresistance in La0.8Ag0.2MnO3
Authors: Kurniawan B , Sahara N A , Imadudin A , Rahman I N , Razaq D S , Munazat D R 
Published: December 2019

Abstract
Bulk polycrystalline sample of La0.8Ag0.2MnO3 has been successfully synthesized by the sol gel method. Structural, morphology, electrical properties and magnetoresistance has been investigated. Refinement results from XRD at room temperature showed a single-phase material with a rhombohedral crystal structure and R-3c space group. Electrical transport showed by comparison of experimental data with theoretical model, the sample undergo a metal-insulator transition at TM-I accompanying the ferromagnetic-paramagnetic transition. Data for temperature dependence of resistivity has been fitted using the formula ρ(T) = ρ

FM

f + (1 − f)ρ

PM
, ρ

PM
is resistivity of the ferromagnetic region, ρPM is resistivity of the paramagnetic region and f is the volume fraction of ferromagnetic phase. Result of fitted data is in good agreement with experimental data. MR measurements in the range of magnetic field 0-1 T, measurements were carried out at temperatures of 15 K, 100 K, 200 K and 285 K, the results showed a decrease in resistivity.