bluuebunny/crossref_metadata_2025_split huggingface dataset:
pH-Control of Oxidative Degradation of Methylene Blue Over Octahedral Molecular Sieve Cryptomelane-Type Manganese Oxide (OMS-2) and Fe-OMS-2
Authors: Sandra I , Muhdarina  , Anggraini R , Siregar S S , Awaluddin A 
Published: December 2019

Abstract
The octahedral molecular sieve cryptomelane-type manganese oxide (OMS-2) and Fe-doped OMS-2 (1%, 5%, 10%) were successfully synthesized by the redox reaction between KMnO4 and citric acid using the sol-gel method. The sol products were heated at 120°C and followed by calcination at 600°C. The as-synthesized pristine manganese oxide and Fe-OMS-2 were then characterized by XRD to determine their crystallinity and phase structure. The XRD results indicated that both the pristine and Fe-doped manganese oxides produced tunnel cryptomelane-type manganese oxides. No other peaks due to other phases are detected, indicating that Fe ions are well distributed in the framework of cryptomelane. The oxidative activities, either the pristine and Fe-OMS-2, were evaluated for degradation of methylene blue (MB) at pH ranges 2-6 by the addition of HCl solution. The oxidative tests showed that the oxidative degradation of methylene blue greatly increase with a decrease in solution pH and decrease with an increase in concentration Fe species in Fe-OMS-2 compared to pristine cryptomelane.
The Tremendous Influence of Calcination Process on the Phase Structure and Catalytic Activity of Precipitation-Processed MnO2
Authors: Asleni  , Kurniati S , Linggawati A , Siregar S S , Awaluddin A 
Published: December 2019

Abstract
The layer and tunnel manganese oxides are versatile materials and have been proposed for various applications. These materials are prepared by a wide range of methods such as sol-gel, solid-state, precipitation and etc. Here, both manganese oxides of birnessite (layer) and cryptomelane (tunnel) have been successfully synthesized using the precipitation method by the reaction between KMnO4 and glucose with a mole ratio of 3:1. XRD results indicated that the birnessite-type manganese oxide was obtained when the brownish-black precipitate was heated up to 120°C, whereas cryptomelane-type manganese oxide was generated when the as-synthesized sample was further calcined up to 600°C. The birnessite sample displays poor crystalline material with low intensity and broad peak. The heat-treated birnessite up to 600°C leads to the formation much more crystalline tunnel cryptomelane–type mangane oxide. The catalytic activities of the as-synthesized catalysts were tested for the degradation of methylene blue (MB) dye with H2O2 as an oxidant. The birnessite catalyst shows much higher catalytic activity for the degradation of methylene blue compared to the cryptomelane catalyst. The tremendous improved catalytic activity of birnessite catalyst are correlated with its poor crystallinity and higher surface area of as indicated by the BET surface area and the XRD results.
Surface Acidity of Sulfuric Acid Activated Maredan Clay Catalysts with Boehm Titration Method and Pyridine Adsorption-FTIR
Authors: Vifttaria M , Nurhayati  , Anita S 
Published: December 2019

Abstract
The acid or base of the solid surface is a very interesting aspect at the structure of surface and important in the field of ion exchange and heterogeneous catalysts. The use of clay as a heterogeneous catalyst is due to its acidity. In this paper, the acidity of heterogeneous catalysts Maredan clay activated by sulfuric acid was examined by the Boehm titration and adsorption pyridine method. In this study, Maredan clay was activated with several variation concentration of sulfuric acid (0.5, 1, 2 and 3 M) by impregnation method. The mixture was refluxed at 80°C for 3 hours, washed with double deionised water, dried and calcined at 500 °C for 3 hours. The results showed that activation of Maredan clay by sulfuric acid produced the total acid amount of 0.6483 mmol/g catalyst by using Boehm titration method and 1.1137 mmol/g catalyst by using pyridine vapor adsorption method. FTIR analysis of the spectra of pyridine adsorption was seen that the acid site of the Maredan clay catalyst activated by sulfuric acid dominant was Lewis acid site, with wave numbers at 1449.57; 1490.07; 1573.98 and 1616.42 cm−1.
Gram Positive Antibacterial Activity of Ethyl Acetate Extract of Penicillium sp. LBKURCC34’s Growth Media Stimulated by Staphylococcus aureus
Authors: Nurulita Yuana , Yuharmen  , Herdiyanti Citra , Khairullinas  , Nugroho Titania Tjandrawati 
Published: December 2019

Abstract
This study was aimed to evaluate the antimicrobial activity of local isolate of peat swamp soil strain, Penicillium sp. LBKURCC34 on Gram positive pathogen, B. subtilis ATCC11774 and S. epidermidis ATCC12228. The fresh strain of Penicillium sp. LBKURCC34 and Staphylococcus aureus was added into fermentation media and incubated for 14 days. The media extracted with ethyl acetateand evaporated, then the concentrate dissolved in methanol. Antimicrobe test was performed by the disc diffusion method and the resazurin-based turbidometric method toward Gram positive bacterial pathogens (Bacillus subtilis ATCC11774 and Staphylococcus epidermidis ATCC12228). The crude extract could inhibit the growth of these pathogen microorganism. The extract with biotic stimulation has higher activity than the extract without biotic stimulation. It could give 10% higher activity against Bacillus subtilis ATCC11774 compared with positive control, amoxicillin. This fungal strain is potential as antibiotics producer.
Mapping the Distribution and Characterization of Sandstone Reservoir Using Simultaneous Inversion Method in “OA” Field at Northern Bonaparte Basin
Authors: Wiyatno Oki Fimansyah , Rosid M. Syamsu , Purba Humbang 
Published: December 2019

Abstract
The sandstone reservoir in the “OA” Field is situated in the Northern Bonaparte Basin, which is gas-saturated sandstone. Mineral diagenesis is also causing several reservoir zone areas to become tight sand. The inversion method using acoustic impedance (AI) is less sensitive in distinguishing sandstone and clay rock lithology since they have almost the same impedance. Simultaneous Inversion overcomes this problem by simultaneously inversing partial angle data (near, mid, far) to obtain physical parameters besides acoustic impedance which are expected to be more sensitive in distinguishing lithology and predicting the presence of gas fluids such as shear impedance (SI) and density. These three parameters can be derived as Lame (LMR) parameters. Cross plot analysis shows sensitive physical parameters to predict the distribution of lithology and the presence of gas fluid. Density sensitive in distinguishing lithology which is then inverted, obtaining sandstone cutoff values are 2.3-2.5 (g/cc), tight sand with cutoff 2.5-2.625 (g/cc) and clay stones with cutoff 2.625-2.8 (g/cc). The presence of gas fluid is predicted by inversing the parameter Vp/Vs
which has a cutoff of >1.6 and Lambda-rho cutoff of >25 (Gpa)*(g/cc). Analysis of the parameter distribution map shows the distribution of sandstones and the presence of dominant gas fluids in the northern area of the research zone with relatively clean sandstone, compared to relatively more southern regions.
Feasibility Study of Riverbed Filtration Technique at Sungai Kampar Perak by using Numerical Modelling
Authors: Mohamad Faizal T B , Mohd Nordin A , Nor Azizi Y , Zaidi E 
Published: December 2019

Abstract
Population growth will result in the increase of water supply demand. Riverbed filtration or radial collector well technique is one of the options for increasing the water supply. Drainage Package of Visual MODFLOW was used for the riverbed filtration modelling. The modelling aimed to identify the optimum pumping rates withdrawal in order to fulfill Lembaga Air Perak requirement for additional water supply. Installation of radial collector wells in the depth of 10-12 m aquifer thickness at Sungai Kampar Perak would increase the supply of clean water for future water demand. The design of riverbed filtration technique consists of 4 m radius of collector well with depth of 10.54 m and five radials wells with 40 m length across the riverbed. Transient condition of the groundwater flow modelling result showed that the optimum pumping rate can meet the water supply requirements of about 35 MLD (35000 m3/day).
Identification of Saline Water and Fluid Flow in Tanjung Priok and Koja North Jakarta Using Geoelectric Method
Authors: Rosid M S , Kusuma F B , Ayu G P 
Published: December 2019

Abstract
To date the cause of saline water in Jakarta area is still debated. One opinion says that salty ground water is caused by sea water intrusion. Other opinions stated that the salty water appears from connate water. The objective of this study is determining the causes of saline water in North Jakarta, especially in Tanjung Priok and Koja. The method used to describe the subsurface fluid flow and resistivity spread is geoelectric method. The method consists of SP (self potential) for fluid flow and resistivity for distribution of subsurface saline water. The data is processed using RES2DINV software and interpreted with processed SP to produce a cross-section map. The results of these two methods are also supported by geological data and wells data samples as well as gravity data in the form of FHD (first horizontal derivative). The results of the resistivity indicate the presence of saline water at a depth of 5-10 meters which is a shallow aquifer. The saline water in this study area most likely caused by the sea intrusion as the SP results show that the subsurface groundwater flows from North to South.
The First Study of 3-D Seismic Velocities Tomography Inversion to Delineate Reservoir Steam Zone at “FR” Geothermal Field West Java
Authors: Farhan  , Syamsu Rosid M. , Riziq Maulana M. , Iskandar Chevy 
Published: December 2019

Abstract
Understanding reservoir conditions is one of the important aspects in fluid production monitoring activities in geothermal systems. The objective of this study to delineate the reservoir element especially the steam phase. It is the first study to requires mapping the existence and geometry of steam phase as an initial step to monitor reservoir conditions at “FR” Geothermal Field using the tomography travel time method. This study used seismogram data measured for 95 days and recorded by 11 seismometers. Arrivals time picking results get 213 microearthquake events with a minimum recorded by 3 recording seismometers. Hypocenter relocation is done by two methods in combination. The first use Joint Hypocenter Determination (JHD) and second use Double Difference relocation method. Then the travel time tomography inversion is using simulps12 software. The results of the hypocenter relocation distribution show one cluster around the main production well those are PPX well may be related to weak zones and reveal majority structure with NW-SE orientation. While in terms of hypocenter depth distributed clusters around the trajectory of production wells B and C from elevations +1 to 0 Km. The tomogram results show that the delineate steam zone at an elevation of +1 to 0 Km with strongly low perturbation VP
, low VS
and low VP
/VS
with arround 1.6 to 1.7 value. Integration with MT data show the steam zone has located at reservoir boundary zone with resistivity value of 30 to 60 Ohm meter. Integration with PPX temperature profiling shows the steam zone has convection heat transfers.
Resistivity and Physical characteristic of Meranti’s Peat
Authors: Yusa M , Sutikno S , Lita D , Ari S , Evelyn  , Fadli D , Dian P 
Published: December 2019

Abstract
Peat physical properties (e.g. unit weight, water content, ash and fibre content) are different from mineral soil due to it high water and organic content. Traditional method requires laboratory test which is time consuming and costly. This study attempted to estimate peat physical properties based on its resistivity value. Peat samples were obtained from several locations and various depth using peat sampler in Lukun village at Meranti Distric, Riau Province. The resistivity value measured in the field using 4 pin soil resistance meter along with the determination of moist weight and unit weight. Laboratory tests were conducted on the sample. Statistical analysis was then performed to check whether there is correlation between field resistivity value and peat physical parameters. The result revealed that water content and dry unit weight are correlated to some degree with resistivity value but not for other parameters i.e. wet unnit weight, specific gravity and ash content.
Implementation of Environmental Education Based Local Potential to Increase Environmental Knowledge Student
Authors: Wulandari Sri , Suwondo  , Haryanto Rudy 
Published: December 2019

Abstract
The challenge of complexity environmental problems requires intensive efforts by environmental education. However, students’ environmental knowledge about of the surrounding local potential is low. It is necessary to integrated implementation of environmental education based local potentials to enhance students’ environmental knowledge. This research was conducted on students at Teaching and Education Faculty, Universitas Riau in August-December 2018. Implementation of environmental education based local potentials was carried out in learning with integrating contents of environmental education curriculum is the concept of ecosystems, environmental problems and environmental management based local wisdom, with data and field facts owned by Riau Province. Implementation is carried out in control and experimental classes, selected based on the homogeneity and normality values of the students’ environmental knowledge. Parameters analyzed were the learning feasibility value by observer and student’s environmental knowledge. Results showed that implementation of environmental education based local potential was very good (0.96-1.00). Implementation learning can increased students’ environmental knowledge by 0.60 (moderate), better than control class by 0.21 (low). So that implmentation of environmental education based local potential can be used as an alternative effort to improve students’ environmental knowledge.
Development of Sound Wave Experimentation Tools Which Influenced by Relative Humidity Using Audacity
Authors: Mariyo Hadis , Islami Nur , Azizahwati  
Published: December 2019

Abstract
The development of experimental tools is important for teachers to assist in the learning process of physics. The purpose research is to develop a sound wave experiment tool that is influenced by relative humidity. The experiment tool was made using a closed and open end PVC tube with a length of 142 cm. Relative humidity obtained is boiling water vapor. Water vapor is entered the PVC tube and the relative humidity level is measured in the tube using a hygrometer. The experiment tool is equipped with audacity software to detect and display sound waves which enter PVC tube. The experimental results are viewed through a graph of sound velocity against relative humidity levels in the tube. When the temperature is 29°C the relative humidity value is 86% with a sound speed of 412 ms−1 and measurement error of 2.01%. The conclusion is the speed of sound increases linearly with increasing relative humidity.
Development of Physics Learning Media on Rotational Materials Based on Interactive Multimedia
Authors: Widodo AYP , Yennita  , Azhar  , Islami Nur 
Published: December 2019

Abstract
Development of learning media is important to be done to help the process of learning physics. The purpose of this research is to develop learning media on the material of rotational dynamics. The media is created using Photoshop software, Corel Draw and Macromedia Flash. This Media consists of opening pages, which contain competencies, materials, games, evaluations and creator pages. This media displays images, animations related to subject matter and games that attract students in learning physics. The results of the development in the form of instructional media are intact so that they can be used by both teachers and students.
Augmented Reality Applied in Astronomy Subject
Authors: Herfana P , Nasir Muhammad , Azhar  , Prastowo R 
Published: December 2019

Abstract
Mobile augmented reality is one of the most potential technology for education. Science astronomy is one of the subject that need to develop by mobile augmented reality technology. Purpose in this research is to create mobile augmented reality based on astronomy subject in Indonesian curriculum in junior high school. Animation that has been show in this application follows Kepler’s law about planetary motion. This research is R&D research and it follow instructional design type ADDIE. This researcher collected the data qualitatively from 2 experts, 2 teachers and 2 students. Each of participant will give suggestion to improve the quality of the application. Finally the application has been made with 16 marker. 11 explain about member of solar system, 3 marker about rotation and revolution of earth and moon, and 2 marker is about solar eclipse and moon eclipse. The application size is 47 Mb with Apk format. It can be use at least in android version 4.1 jelly bean and camera 13 MP. This application is ready to use for more large participant.
The Effect of Attribute Hierarchy Method (AHM) with OMC Model on Chemistry
Authors: Rery R. Usman , Frimansyah Monica Ramadhani , Abdullah  , Alimin Masnaini 
Published: December 2019

Abstract
This study aims to determine the learning difficulties of learners using the Attribute Hierarchy Method (AHM) with ordered multiple choices (OMC) model on chemical equilibrium. The Instruments develop used ADDIE (Analyze, Design, Development, Implementation and Evaluation) model. The research instrument used a multiple-choice test that has a score that all correct answer options. There are 8 types of attributes concerning chemical equilibrium in the instrument. The sample was high school students in Pekanbaru. Instrument validity includes material, construction, and language aspects. Based on the validity test results obtained that the developed instrument has been in valid category. Material validity aspect value 3.50, validity of the construction obtained value 3.7 and aspects of language value of 3.59. Instrument reliability test results using the formula of KR-20 obtained a value of 0.717 in high category. The learning difficulties of learners obtained that learners have the greatest learning attribute 6, which is the equilibrium constant of pressure (Kp) which has not been mastered by 58% of students 2.) Attribute 7 is the relationship between Kp and Kc that has not been mastered by 63.75% students, 3.) Attribute 4 is Le Chatelier’s principle which has not been mastered by 80% of students and 4.) Attribute 8 is the degree of dissociation that has not been mastered by 77.5% of students.
Exploration of Physics Concepts of Jatim Park: From Classical Physics to Digital Technology
Authors: Suprapto N , Adam A S , Suliyanah  , Sunarti T , Mubarok H 
Published: December 2019

Abstract
As the common understanding, physics extend well in every part of life, include in many holiday destinations in Indonesia. In the east of Java, Jatim Park group has established by the combination of education and entertainment, produce the concept of learning while playing. However, most of the props didn’t contain the farther information about the cause or the process of certain phenomena. This particular study is part of the combination of the observation, literature study from relevant sources and authors’ knowledge in physics concept analysing. Accordingly, this paper describes the physics concept in two different locations of Jatim Park group, Jatim Park 1 and Jatim Park 3 (Infinite World). Moreover, the physics exploration captures the modernity of that destination, from classical physics to digital technology. In addition, the authors represent the standardization of the physics props on both of that park.
Epistemological Belief of Physics Students in Finishing Thesis: The Preparation of Being Participatory Action Research
Authors: Suliyanah  , Suprapto N , Mubarok H , Adam A S , Sunarti T 
Published: December 2019

Abstract
Indonesia is a unique country in higher education, undergraduate students are required to complete their final project in the research form that called a thesis. Various problems recognized by the students become their own experience in practicing research and writing. The aim of the study is a description of the students’ ability, especially physics students about the epistemological belief of physics students in finishing the thesis. This study used a qualitative-quantitative combination research design (mixed method) with exploratory research design techniques. This research using Participatory Action Research (PAR) strategy was involving by Physics Education students at Surabaya State University. The result of this study shows that the physics students have good epistemological belief in finishing the thesis. Most of the participatory action researches are more interested in the physics learning media field.
Pre-Service Physics Teachers’ Experiences of Being Member of Photo Voice Project
Authors: Sunarti T , Mubarok H , Suliyanah  , Adam A S , Suprapto N 
Published: December 2019

Abstract
In effort to map the readiness of high school physics laboratories in East Java to support the achievement of Basic Competency (BC) Skills, research has been conducted involving prospective teacher students through the technique of “photo voice”, to optimizes pre-service physics teacher who take part in learning field practice in 2019 as participant research (teaching exercises as well as research exercises) through Participatory Action Research (PAR) 93 prospective teacher receive photography training, plan shooting actions, reporting the results of taking a physics laboratory shot at a partner school in the form of an article. Providing experience to prospective teacher has a positive impact on the achievement of pedagogical and professional competence. The impact of the experience is that students have been able to take laboratory photo images in accordance with the purpose of displaying images. By doing so, the project of making articles from capturing and interpreting laboratory images is used as achievement of BC of knowledge and BC of skills as mandated by the Indonesian education curriculum 2013.
Essential Factors Influencing Preparation of Physics Laboratory in New Curriculum: Photo Voice Study
Authors: Suprapto N , Suliyanah  , Sunarti T , Adam A S , Mubarok H 
Published: December 2019

Abstract
This research was stimulated by the situation of Indonesian curriculum especially in physics that requiring the balancing between basic competence of knowledge and skills. Currently, the main problem is the basic competence of skills become the second orientation, therefore, it should be more attention. Physics laboratory is the essential room in supporting the implementation of new curriculum, K13. Through a qualitative study, this research used interview process to pre-service and in-service physics teachers in East Java Indonesia. Totally, 4 in-service physics teachers and 9 pre-service-physics teachers were invited in the semi-structured interview process by utilising photo voice approach. The research captured seven factors as well as the attitudes towards new physics curriculum, which categorised into: practical application, curriculum content, academic anxiety, need analysis, globalisation effect, assessment effect, and government policy. Meanwhile, each factor was implicated to other factors.