bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of various sintering temperature of ceramic TiO2 on physical properties and crystall structure
Authors: Mulyadi  , Ramlan  , Nur’ Aini Siti , Djuhana  
Published: August 2019

Abstract
Titanium dioxide has been made by using sintering method with variation of temperature sintering. This method uses 100 % of Titanium dioxide powder as the raw material. The Titanium dioxide powder was pulverized by using High Energy Milling for one hour and continued with compacted to form a pellet by dry pressing with 8 tons force. Then the pellets were sintered by using electrical furnace with variation of temperature of 700°C, 850°C and 1000°C. The characterization of sintered samples includes measurement of density, porosity, hardness and XRD. The results show that the sintered 700°C sample has the smallest density of 1.94 g/cu.cm and the largest porosity 20 % and hardness 228 Hv. For the sintered 1000°C samplehas greatest density of 2.38 g/cu.cm and smallest porosity of 15.9% and hardness 276 Hv. The results of the phase anlysis with XRD show that the dominant phase is anatase and minor phase is rutile
Analysis of peak ground acceleration (PGA) using the probabilistic seismic hazard analysis (PSHA) method for Bengkulu earthquake of 1900 – 2017 period
Authors: Puteri Delita M , Affandi Azhar K , Sailah Siti , Hudayat Nurul , Zawawi Mahdi Kokab 
Published: August 2019

Abstract
This study was aimed to find out and analyze Peak Ground Acceleration (PGA) in order to mitigate the earthquake. The PGA map resulted was an acceleration map on bedrock with a probability exceeding 10% and 2% with the Probabilistic Seismic Hazard Analysis (PSHA) method for PGA in 50 years. The software used to analyze the Probabilistic Seismic Hazard Analysis (PSHA) method is USGS-PSHA. The data used was in the form of historical earthquake data from 1900 to 2017 and a depth of 1 km to 300 km. Earthquake magnitude ≥ 4.5 Mw with a research limit of 2.53° - 7.58° SL and 96.1° - 106.1° EL from the International Seismological Center (ISC) earthquake catalog, ISC-EHB Bulletin, United States Geological Survey (USGS) and The Geophysical Climatology Meteorology Institution (BMKG), a radius of 500 km from the border of Bengkulu Province. The results show that the most earthquakes for shallow depths with a magnitude of 4.5 Mw - 5.9 Mw as much as 2805 times, while for medium depths at magnitude 4.5 Mw - 5.9 Mw as much as 642 times. The probabilistic calculations exceeding 10% are 0.24 gal - 0.86 gal and probabilistic calculation exceeding 2% is 0.36 gal - 1.35 gal. The areas exposed to the danger zone are Lebong, Rejang Lebong, Kepahiang, Mukomuko, North Bengkulu and Bengkulu City. Whereas the regions included in the medium zone are Seluma and Bengkulu Tengah. And the areas of the safe zone are Kaur and South Bengkulu.
Effect of composition of LiMn2O4 cathode sheet on the electrochemical performance of lithium ion battery
Authors: Liasari Beta Riana , Bangun Jorena , Priyono Slamet , Ramlan  
Published: August 2019

Abstract
The effect of composition of LiMn2O4 sheet on the electrochemical performance of lithium ion battery has been studied. LiMn2O4 powder is synthesized by solid state reaction method using raw material such as LiOH.H2O and MnO2. Raw materials are stoichiometrically mixed and milled using planetary ball milling for 4 hours to become precursor. The precursor is sintered using a muffle furnace at 800 °C for 4 hours in a free air atmosphere. The sintered material is pulverized and sieved 200 mesh to form a fine LiMn2O4 powder. The material is analyzed by XRD to determine the phase and crystal structure. Powder is prepared for sheet by mixing with PVDF binder and carbon black additive in various ratio such as 85:10:5, 88:8:4 and 90:7:3. After becoming slurry, the slurry was coated onto Al foil with 300 µm in thickness and dried at 70 °C for an hour. The sheet is assembled into a half cell battery with Li metal as the counter electrode and LiPF6 as liquid electrolyte. The battery cell is measured by using the automatic battery cycler WBCS 3000 to determine the electrochemical performance. The measurement showed that samples with composition 90% active material has highest capacity with 3.6 mAh but gives bad cycle.
Effect of polymer binders on the electrochemical Performance of Al-doped lithium titanate electrode
Authors: Priyono S , Sari T D , Ramlan  , Subhan A , Prihandoko B 
Published: August 2019

Abstract
The investigation of polymers as binders of Al doped Li4Ti5O12 for Li-ion battery electrode is reported. Polimer binders such as Polyvinylidene fluoride (PVDF), polyvinyl alcohol (PVA), and Polytetrafluoroethylene (PTFE) were used to make electrode sheet. Al doped Lithium Titanate (Al-doped Li4Ti5O12) were used as electrode powders. Al doped Li4Ti5O12 powders were synthesized from LiOH.H2O, TiO2 and Al2O3 via solid state reaction. X-ray diffraction (XRD) was used to analysed phase and size of particle. Electrode sheets were manufactured by used active material, binders, and acetylene black in ratio 85:10:5 wt%. Electrode sheets were cut and assembled into coin cell batteries. Coin cell samples were characterized by EIS, cyclic voltammetry and charge-discharge to get electrochemical performance. XRD result reveals that there are two phases formed from final product such as Li4Ti5O12 and rutile TiO2. EIS diagram showed that sample with PTFE binder has the best conductivity with 3.10−5 S/cm. While, cyclic voltammetry and charge-discharge test showed sample with PVDF binder has the best chemical performance with good redox peaks and highest specific capacity about 110 mAh/g.
Crystalline structures properties doped RuO2 (0, 2, 4, 6%) of thin film LiNbO3
Authors: Setiawan Ardian Arif , Novitri  , Irzaman  , Zuhri Mahfuddin , Irmansyah  , Alatas Husin 
Published: August 2019

Abstract
Lithium Niobate (LiNbO3) can be applied as a thin film coating because it has superior piezoelectric, optoelectronic, pyroelectric, and photorefractive properties. The growth of LiNbO3 thin film using Chemical Solution Deposition (CSD) method with spin coating technique speed of 8000 rpm for 30 seconds on a p-type silicon substrate (100) with variations in concentration of RuO2 container (0%, 2%, 4%, 6%) and annealing temperature (750 ºC, 800 ºC, 850 ºC). The annealing temperature is kept on hold for 8 hours with an increase of 1.67 ºC/minute. The result of LiNbO3 of the analysis using the Cramer and Cohen method obtained hexagonal crystal structure (α = β = 90º and γ = 120º) with a lattice parameter value of 5.3856 Å to 5.6566 Å and c lattice parameter value of 15.4054 Å to 17.8404 Å.
Isolation of active compounds from the leaf extract of patah kemudi (Abroma augusta L.) and its anti-inflammatory activity
Authors: Latief M , Amanda H , Utami A , Muhaimin  , Nurhayati  
Published: August 2019

Abstract
Patah kemudi (Abroma augusta L.) is one of the shrubs that live on the edge of a river. A. augusta contains several secondary metabolite compounds including alkaloids, triterpenoids, steroids and flavonoids. The aim of this study was to isolate the compounds contained in the leaves of Abroma augusta and determine anti-inflammatory activity. Extraction and fractionation were performed by multilevel maceration. Isolation of compounds was carried out by column chromatography. The anti-inflammatory activity test was done using the Winter method. The n-hexane extract was separated by vacuum column chromatography and continued with gravity column chromatography to obtain isolate 8.1, which was then characterized using UV-Vis and IR spectrophotometer. The results of UV-Vis spectrophotometer on isolate 8.1 showed absorption at a maximum wavelength of 268 indicating a conjugate double bond which may be an aromatic originating from steroid compounds. While, the results of IR spectrophotometer characterization from isolate 8.1 manifested the presence of steroid compounds. The results of the activity test of isolate 8.1 with a dose of 10 mg presented the best anti-inflammatory activity compared to the positive control of diclofenac sodium. From the results of the GCMS shows that isolates contain γ-sitosterol compounds with a value of m/z 414.
Biosorption of Cu(II) onto algae biomass (Oscillatoria Splendida) isolated from swamp water ecosystem in Palembang, South Sumatera
Authors: Mohadi Risfidian , Setiawan Doni , Zulkifli Hilda 
Published: August 2019

Abstract
Studies of adsorption of Cu(II) on algae biomass (Oscillatoria Splendida) isolated and cultured from algae swamp ecosystem in South Sumatera have been carried out. These studies included determination of pH and kinetic biosorption at various contact time, isotherm and biosorption capacity of interaction between Cu(II) onto algae biomass (Oscillatoria Splendida). The result showed that the optimum pH was 5, and the optimum contact time was 30 min. Biosorption capacity of algae biomass (Oscillatoria Splendida) toward Cu (II) was 55.15 mg/g and agree to Pseudo-Seconds-Order kinetic model with the rate of reaction k2 is 0.00642 mg g−1 min−1 and the adsorption thermodynamic agree to the Langmuir’s model.
Tuning the stability of red color natural pigments in fruit extracts by pH control
Authors: Yuliati Leny , Juliana  , Indrawati R 
Published: August 2019

Abstract
Natural pigments have been recognized as potential sources for natural colorants and visible light absorbers. Unfortunately, most natural pigments have problems with the stability, which limited their potential uses for various applications. In this study, extraction of five types of red fruits, which were tomato, watermelon, strawberry, carrot, and papaya, was carried out by a slow juicer. After drying by a freeze dryer, the stability of each extract was then monitored by color measurements at various pH of 1–10 for 7 days. The results showed that the stability of the pigments was affected by the pH. However, most of the pigment extracts still suffered from the stability issue as the red color scales were found to decrease with the increase of the storage time in most any pH conditions. Particular attention was made to the strawberry extract that could be successfully stabilized at pH of 1. In addition to its stability, the strawberry extract also gave the highest red color scale among all the investigated extracts. This result suggested that the stability of the strawberry extract was tunable by the pH control and thus, its potential use as a red color source for various applications could be expected.
Development of potensiometry method for Zn analysis
Authors: Suheryanto  , Sari Rani Nawang , Hariani Poedji Loekitowati 
Published: August 2019

AbstractIn this research, focus for analysis Zn ion using a concentration cell potentiometry method with a Hantexmultimeter. Concentration cells are electrochemical cell circuits where the same type of solution is used but different concentrations, the more concentrated solution being the more dilute cathode and solution to the anode. So that the flow of electrons from the dilutes solution to concentrated occurs until equilibrium is reached. The multimeter connected with computer to display data processing so the analysis be easier. This method has high accuracy 98.20% and precision 0.45%.This potentiometry method can be used as an alternative method of Zn analysis.
Film (patch) based on starch compound hydrolise by amylase from saliva and bacteria
Authors: Miksusanti  , Herlina  , Fithri A.N , Yuniar  , Novalin V , Julinar  
Published: August 2019

Abstract
Research on the determination of amylase enzyme activity on hydrolysing film (patch) made from sugar palm starch with the addition of STPP and Temu putih (curcuma zedoaria) freeze drying powder have been done. The purpose of this study was to determine amylase enzyme activity of saliva and amylase from bacteria in hydrolysis of sugar palm starch and edible film made from palm starch with the addition of STPP and Temu putih freeze drying powder. Amylase enzyme activity was analysed using UV-Vis spectrophotometer and DNS reagent. Determination of amylase enzyme activity in hydrolysing edible film was carried out by reacting enzyme with various edible film at optimum condition. The result of amylase enzyme activity from saliva and bacteria was obtained at temperature 35 °C, pH 7, substrate concentration 2.5%, and incubation time 95 min. The enzyme was reacted in various concentration against edible film at optimum condition. Amylase enzyme activity of saliva gave optimum edible film hydrolysis in the addition of STPP of 10.26 unit/mL, whereas the best enzyme activity of amylase from bacteria achieved with the addition of STPP and 3% freeze drying powder of Temu putih at 23.09 units/mL. Data analysis using one-way analysis of variance obtained F-value less than F-table at significance level 0.05. The result implied there is no significant difference on amylase enzyme activity from saliva and bacteria when it used to hydrolyse sugar palm starch and edible film from sugar palm starch with the addition of STPP and Temu putih freeze drying powder.
Synthesis and characterization schiff base and complexes with Copper (II) and Iron (II) and their application as antibacterial agents
Authors: Hidayati N , Fatma  , Purwaningrum W 
Published: August 2019

Abstract
The Schiff base N-(2-hydroxybenzylidene)chitosan and its complexes with copper(II) and iron(II) were synthesized and applied as antibacterial agent. The Schiff base and its complexes characterized by UV-Vis, FTIR spectrophotometer and XRD diffractometer. Antibacterial activity of the Schiff base and its complexes toward Escherichia coli and Staphylococcus aureus bacteria were assessed by paper disc diffusion method. Electronic transition indicated the absorption of azomethine group from Schiff Base and absorption of d-d transition from metal ion. FTIR characterization of Schiff base indicated the azomethine group have been formed. Absorption Schiff base shifted indicating coordinated to metal ion. X-ray diffractometer studies show the formation of complexes decreased of cristalinity of chitosan. The complexes of copper(II) and iron(II) with N-(2-hydroxybenzylidene)chitosan have antibacterial activities bigger than the Schiff Base or pure chitosan attributed to the increased lipophilic nature of the complexes arising due to chelation.
Monitoring of formulation and hazardous ingredients of residential insecticide which sold in Palembang
Authors: Khairunnisa Mia Hayati , Ghiffari Ahmad , Anwar Chairil , Dalilah Dalilah 
Published: August 2019

Abstract
The insect-borne disease is one of health problem. The high mortality and morbidity rates of disease mostly controlled on chemical insecticide. Precaution was needed on selecting the residential insecticides since it can also harm human. This study was to identify the formulation and active ingredients of residential insecticides. This was a descriptive study with an observational design. The sample used was all insecticides sold in location of Palembang Square Mall. Variables observed were the insecticides’ forms, the insect targets, the active ingredients, and the class of toxicity. As conclusion, there were 57 type of insecticides and 14 type of active ingredients found in the location. Most insecticides were from liquid synthetic pyrethroid group, unfortunately categorized in the hazardous class. Further research is necessary to determined whether the insecticide already effects on human health.
Protection of mild steel from corrosion using methanol extract of avocado (Persea americana mill) seeds in a solution of sulfuric acid
Authors: Gusti D R , Lestari I , Farid F , Sirait P T 
Published: August 2019

AbstractAvocado seeds have been studied for use as corrosion inhibitors of mild steel in a solution of 0.75 M sulfuric acid. Corrosion inhibition efficiency at a concentration of 10 g / L avocado seed extract (ASE) was obtained at 74.56% with weight loss method and 68.38% with potentiometric polarization method. Corrosion inhibition efficiency was found to be greater with increasing ASE concentration. Polarization studies show that the avocado seed extract is a mixed corrosion inhibitor. SEM images on mild steel with the addition of ASE showed the formation of a thin layer on the mild steel surface. OH and CN functional groups appear on the FT-IR spectrum of ASE. These functional groups interact with iron on the steel surface to form a thin layer that can inhibit corrosive ion attacks from sulfuric acid solutions.
Study on the anti-inflammatory properties of Karamunting (Rhodomyrtustomentosa (Aiton) Hassk.) leaf extracts
Authors: Solihah Indah , Wulandari Widya , Herlina  , Puspita Rasyid Riana Sari , Suciati Tri 
Published: August 2019

Abstract
Karamunting (Rhodomyrtustomentosa (Aiton) Hassk.) is one of the most widespread plants in Sumaterawhich areknown to have traditionally used as wound and infection remedy. However, research on anti-inflammatory activity is limited. This study aimedto determine the effect of antiinflammatory of Karamunting (Rhodomyrtus tomentosa (Aiton) Hassk.) leaf extracts using acute rat model (carrageenan-induced rat paw oedema). Sodium diclofenac 4,5 mg.kg−1BW as standard anti-inflammatory drug, n-hexane, ethyl acetate, and ethanol of Karamunting (Rhodomyrtus tomentosa (Aiton) Hassk.) leaf extracts each dose 200 mg.kg−1BW were administered orally to 24 Wistar rats 1 h before induction oedema and compared with a negative control given Na CMC 1%. The mean percentage inhibition of paw volume of rats treated with sodium diclofenac was 64,82%, followed by n-hexane extract with 44,75%, ethyl acetat extract with 56,93%, and ethanol extract with 63,56%. All extract have similar antiinflammatory effect with sodium diclofenac (p>0,05). This result suggest that all Karamunting (Rhodomyrtus tomentosa (Aiton) Hassk.) leaf extracts have antiinflammatory properties comparable withstandard drugs.
Antioxidant activity of isolated compound from perepat roots (Sonneratia alba)
Authors: Latief M , Utami A , Amanda H , Muhaimin  , Afifah Z 
Published: August 2019

Abstract

Perepat (Sonneratia alba) is one of the mangrove plants found in Tanjung Jabung Timur, Jambi Province. Research on perepat plants has been widely carried out on leaves, fruit and bark, but there is no research on perepat roots, so it is necessary to do research on perepat roots. This study aims to determine the compounds found in ethyl acetate extract from roots which have antioxidant activity. Extraction and fractionation of perepat roots were carried out in multilevel maceration. The isolation technique was carried out using vacuum column chromatography and gravity column chromatography. The isolated compound was identified using UV-Vis spectrophotometer, FT-IR and NMR. Antioxidant activity test of the isolated compound was carried out by DPPH method. Characterization using UV-Vis gives maximum absorption at wavelengths 268and 313 nm. While the characterization with FT-IR provide information that the isolate containing functional groups of OH, C=O, CH3 and CH2. Further identification using NMR suggests that isolate are a mixture of stigmasterol and ß-sitosterol compounds, known as phytosterols. Antioxidant activity testing of ethyl acetate extract and isolate gave IC50 values of 223.67 and 439.71 ppm, respectively, indicating that these compounds were classified as less active but still potential as antioxidants.
Estimation of mixed layer depth from argo float data in Makassar strait during el niño southern oscilation
Authors: Amalia F , Mubarrok S , Mandang I 
Published: August 2019

Abstract
Makassar Strait is a pathway of water mass passing trough from the Pacific Ocean to the Indian Ocean. Makassar Strait is also one of the waters in Indonesia which passed by Indonesian Throughflow (ITF). Movement of water masses due to the ITF, wind system, and complex bathymetry conditions will cause the movement of vertical water masses (mixing). This makes the upper layers homogeneous, the objective of this study is to assess the variation of MLD using Argo Float data adjusted for ENSO (El Niño Southern Oscilation) events, under El Niño, La Niña, and normal conditions. MLD determination using temperature gradient criterion with value ≤ 0,1 oC/m. The data processing using Ocean Data View 5.0.0 software shows that the depth of homogeneous layer in Makassar Strait waters during El Niño years is various, between 37,73 – 73,62 m with temperature 25,7 - 28,99 oC. During La Niña, MLD found varying around 30,59 – 97,89 m with temperature profile slightly colder (26,7 – 29,8 oC). And during normal year, MLD located around 28,55 m to 112,98 m, shallowest and deepest from all data set, respectively. Average value of MLD in is vaguely normal deeper than La Niña and El Niño condition, as it should be shallower, showed that temperature gradient criterion with value ≤ 0,1 oC/m is not quite good to determine the MLD layer in Makassar Strait.
Kinship of the swamp buffalo (bubalus bubalis) in Tanjung Senai, Ogan Ilir, South Sumatra based on morphological characteristics
Authors: Windusari Yuanita , Hanum Laila , Setiawan Arum , Pratama Rahmat , Sari Desi Puspita , Palupi Rizki 
Published: August 2019

Abstract
Research conducted for observe phylogenetic relationship swamp buffalo (Bubalus bubalis) Ogan Ilir regency, South Sumatera based on morphological characteristic. The Sampling done by using a survey method and inventory in the field (on-farm) to obtain data of the characterization and swamp buffalo morphological. The result indicate that there are six variant, namely are BlackBuffalo, Lampung Buffalo, Red Buffalo, Dungkul Buffalo, Straight Buffalo, and Tunjang Langit Buffalo. Black Buffalo has black body colour and horns bent backwards. Lampung has black body colour and horns bent upwards. Red Buffalo has red body colour and horns bent upwards. Dungkul has black body colour and horns bent downwards. Straight has black body colour and horns bent straight to the side. Tunjang Langit Buffalo has black body colour and horns bent upwards and downwards.
Comparative photocatalytic performances towards acid yellow 17 (AY17) and direct blue 71 (DB71) degradation using Sn3O4 flower-like structure
Authors: Huda A , Ichwani R , Handoko C T , Bustan M D , Yudono B , Gulo F 
Published: August 2019

Abstract
Microsphere Sn3O4 flower-like structure has been successfully synthesized using a novel microwave-assisted hydrothermal method and comprehensively characterized by X-ray diffraction (XRD), field emission gun scanning electron microscope (FEG-SEM) and UV Vis spectrophotometer equipped with diffuse reflectance spectroscopy (UV-Vis DRS). In order to examine its photocatalytic performance, two synthetic azo-based dyes, acid yellow 17 (AY17) and direct blue 71 (DB71), have been used as organic pollutant models degraded under visible-light illumination. The results show that the negative charges of Sn3O4 produce higher efficiency photocatalytic activity on DB71 degradation compared to that on AY17 degradation. Further investigation has confirmed that the adsorption capacities played the main role in determining photocatalytic performance and differentiated the quantum yield of dye degradation. Moreover, the different adsorption capacities are generated by the formation of electrostatic interaction and repulsion between surface charge of Sn3O4 and dyes functional groups.