bluuebunny/crossref_metadata_2025_split huggingface dataset:
Antioxidant activity of Indonesian water spinach and land spinach (Ipomoea aquatica): A comparative study
Authors: Mariani R , Perdana F , Fadhlillah F M , Qowiyyah A , Triyana H 
Published: December 2019

Abstract

Ipomoea aquatica is Convolvulaceae plant that is widely consumed in Southeast Asia as a vegetable. The plant contains various bioactive components, e.g. phenols and flavonoids. Water spinach and land spinach are two varieties of Ipomoea aquatica in Indonesia. Both extracts have been analyzed for their free radical scavenging activity using DPPH (2,2-diphenyl-1-picrylhidrazyl). Total phenol was measured using Folin Ciocalteu and the total flavonoid was measured using AlCl3. Both extracts also have been analyzed by TLC (Thin layer chromatography) using DPPH and AlCl3 spray reagents. Water spinach has higher antioxidant activity than land spinach and there was a correlation between antioxidant activity and total phenol/flavonoid content. Based on TLC results, it was supposed that the compound responsible for antioxidant activities in water spinach and land spinach was flavonoid.
Characterization of nano ceramic composite of Mullite-Magnesia-Yttria stabilized Zirconia system
Authors: Hakim B L , Subawi H , Mauhuddin Y , Aulawi H 
Published: December 2019

Abstract
The oxide and nano ceramic system of Mullite-Magnesia-Yttria Stabilized Zirconia were studied. Some fracture toughness models were examined to evaluate the crack length parameter to comply with Palmqvist and median crack criteria at c/a ratio equal to 3.0. The mullite crystal structure was observed using SEM and looks likely needle, whereas 3YSZ crystal appears smoother. Through EDS analysis, it detected the oxides in Mullite system, i.e., Al2O3, and SiO2. With a similar method, some oxides observed in the Mullite-Magnesia-3YSZ system such as MgO, Al2O3, SiO2, Y2O3, and ZrO2. With XRD analysis, nano MMZ system shows containing Al6Si2O13, Corundum (Al2O3), Zirconia (ZrO2), and Quartz (SiO2). Fracture toughness KIC of the ceramic composite of nano mullite-magnesia-zirconia complies with Palmqvist and median crack criteria. Nano ceramic particle shows a higher value of hardness and fracture toughness while compared with oxide ceramic system.
Effects of seeding temperature and growing time on the nanostructural characteristics of ZnO nanorods thin films prepared by chemical bath deposition
Authors: Liyana G R , Yuwono A H 
Published: December 2019

Abstract
ZnO nanorods have been attracting much interest of researchers owing to their unique properties and extensive potential for various applications including light-emitting diode, dye-sensitized solar cells, and field-effect transistor. For being applied on those strategic applications, some basic nanostructural characteristics of ZnO nanorods such as crystallite size and the band gap energy are essential since they play important role in the device performance. In this study, the effect of seeding temperature and growing time on the nanostructure characteristics of ZnO nanorods were investigated. The seed solutions were initially prepared at the temperature of 0, 30, and 60°C for 1 hour by using zinc nitrate tetrahydrate and hexamethylenetetramine as precursors. The ZnO seed layers were subsequently deposited onto ITO glass substrates by spin coating technique before the chemical bath deposition (CBD) growth at temperature of 90°C for three different growth times (3, 4, and 5 hours). The synthesized ZnO nanorods were characterized by field-emission scanning electron microscopy, x-ray diffraction, and ultraviolet-visible spectrophotometry. The results showed that with the increase in seeding temperature from 0 to 60°C, the crystallite size decreased from 61.83 to 51.54 nm, while the band gap energy increased from 3.36 to 3.57 eV, respectively. On the other hand, with increase of growing time during CBD, the crystallite size was increased from 51.54 to 75.17 nm, and the band gap energy was consequently found to decrease from 3,57 to 3,46 eV. Considering the observed results above, the low seeding solution temperature and CBD growth time control are promising to optimize various applications performance required to have remarkably high crystallinity and low band gap energy.
Fabrication of Titanium Dioxide-reduced Graphene Oxide (TiO2/rGO) nanocomposites as the Photoanode in Dye Sensitized Solar Cells
Authors: Daulay S , Madsuha A F , Rosa E S , Yuwono A H 
Published: December 2019

Abstract
One of the photovoltaic cells generation promising for low-cost fabrication is dye-sensitized solar cell (DSSC). However, it has a drawback─low efficiency because of electron recombination occurrence and low transparency of photoanode. Graphene-based materials show the potential to overcome this problem. In this work, we have investigated the integration of reduced graphene oxide (rGO) into the titanium dioxide (TiO2) photoanode in DSSC. A simple Hummer’s method has been used to synthesize graphene oxide flakes. The nanocomposite of rGO/TiO2 has been formed by varying the percentage of rGO between 1% and 5%. The result shows that the percentage of rGO in nanocomposite affected device performance. The efficiency decreases along with the increase in rGO. The best result was obtained with 2 wt% addition of rGO into TiO2 photoanode that resulted in 0.9 % efficiency.
Evaluation of drilling hydraulic calculation to the ability of bottom hole cleaning
Authors: Widiyatni H , Rizkina A , Dirastri W I 
Published: December 2019

Abstract
In drilling operation there are two important matters that must be considered, which are the pumps and drilling fluid rheology that are influencing hydraulics drilling system. The major function of drilling fluid is to lift the drill cutting to the surface and still maintain the drilling hole to avoid an encounter. Evaluation of hydraulics drilling for bottom hole cleaning will count the parameter success which influence in removal of cutting to the surface for bottom hole cleaning and optimization drilling calculation hydraulics. The velocity of drilling fluid in annular, the flow that is formed and the ability of bottom hole cleaning are highly influenced by specifications of mud pump as a resource power for mud to flow that also will determine how the value of flow rate can be circulated. Mud rheology, PV, YP and MW will influence the performance of mud to carry cutting on drilling operation. The penetration to formation rock will make the broken bits of solid material removed from a borehole drilled by bit and resulting the drill cuttings. These cuttings could settle on the bottom of borehole so the main purpose of drilling fluid is to carry the cuttings to the surface, besides the drilling fluid also protecting borehole condition from any drilling problems. This evaluation is using Power Law Model for calculate pressure losses, drilling hydraulic optimization and also observe the parameter of Cutting Transport Ratio (Ft), Cutting Concentration (Ca), Cutting Carrying Index (CCI) and Particle Bed Index (PBI). The optimization results from Bit Hydraulic Horse Power (BHHP) method produce significant changes which are percentage horse power delivered to bit (%HHP) increasing to 53.17 – 54.79 % from actual condition which only ranges 5 – 51 %. Q optimum is very influential on the value of bit hydraulic horse power (BHHP) and surface horse power (HPS) that provide more optimized power to pump the mud with minimize the effect of pressure loss.
Melting of gold nanoparticle: study on structural evolution
Authors: Fahdiran R , Handoko E , Sugihartono I , Sunaryo S , Budi E , Susila A B , Budi S 
Published: December 2019

Abstract
We investigate the structural evolution on melting of Gold nanoparticle due to heat treatment from room temperature up to slightly above melting point. The evolution is followed using Molecular Dynamics (MD) simulation. Structure factor and pair distribution function calculation indicated that the system is melted at the end of simulation. Common Neighbour Analysis (CNA) method shows the local lattice structure transformation confirming phase transition.
Effect of low nickel substitution on structure, morphology, and electrical transport of La0.7Sr0.2Ba0.1Mn1-xNixO3(x=0.02 and 0.05)
Authors: Munazat D R , Kurniawan B , Imaddudin A 
Published: December 2019

AbstractThe effect of low nickel substitution at Mn-site on structure, microstructure and electrical transport properties of La0.7Sr0.2Ba0.1Mn1-xNixO3(x= 0.02 and 0.05) were investigated. Samples were prepared by sol-gel method. From Rietveld refinement result, crystal structure of both samples were found to be Rhombohedral with R-3c (167) space group. Low nickel substitution at Mn-site shows that the Mn-O-Mn bond angle decreases and the Mn-O bond length increase which can link to Jahn-Teller distortion and double exchange. Scanning electron microscope (SEM) result reveals that nickel substitution leads to smaller grain size. Temperature-dependent resistivityρ(T) has been measured at 15-285 K with zero field cooling. The experimental resistivity data were fitted by Percolation model. Percolation model can describe the electrical behavior of both samples based on electron-electron, electron-magnon, and electron-phonon scattering, and Kondo-like spin-dependent scattering at low temperature and adiabatic small polaron hopping at high temperature. It was found that nickel substitution decreases the metal-insulator transition temperature (TM-I) from around 304 to 272 K, and Curie temperature (Tc) from around 330 to 310 K.
Influence of sintering temperature on the structure and electrical transport properties of La0.7Ba0.1Sr0.2Mn0.85Cu0.15O3manganites
Authors: Razaq D S , Kurniawan B , Imaduddin A 
Published: December 2019

AbstractA systematic study of the La0.7Ba0.1Sr0.2Mn0.85Cu0.15O3manganites have been conducted, mainly to understand the influence of sintering temperature on structure, microstructure, and electrical transport properties in the materials. Polycrystalline sample of La0.7Ba0.1Sr0.2Mn0.85Cu0.15O3were prepared using sol-gel method and sintered at 1100 °C and 1200 °C. X-ray diffraction result shows that sintering temperature does not affect the crystal structure of the materials which remain rhombohedral with R-3c space group. a more detailed examination shows that sintering temperature change the unit cell volume, <Mn-O-Mn> bond length, and <Mn-O> bond angle of the samples. The electrical resistivity decreases followed by the decrease in the grain size with the increase in sintering temperature. Analysis using theoretical model shows that both samples can be well explained using percolation model. Fitting result suggests that the transport properties of the materials at low temperature were governed by the scattering and interaction between electron, phonon, and magnon. At high temperature, the electrical transport of the samples was governed by the hopping of polarons.
Source rocks study and thermal modelling in Salawati basin, West Papua
Authors: Muhartanto A , Hamdani A H , Safrizal S , Fauzielly L , Triwerdhana A 
Published: December 2019

Abstract
Hydrocarbon in Salawati Basin is generated from Tertiary and Pre-Tertiary source rock. Several source rocks studies have been conducted, such as in Sirga, Kais and Klasafet Formation. Lack of knowledge in characteristics and thermal modelling source rock in Sirga and Pre-Faumai Formation, also curiosity to observe basin reverse polarity occurrence is intriguing to be researched further. The purposes of this research are to know: a.) Sirga and Pre-Faumai Formation source rock characteristics to generate hydrocarbon in Salawati Basin; b.) Maturity values based on %Ro, Tmax and 1D basin modelling. Research methodology was carried out using petroleum geochemistry analysis, including: TOC, Rock Eval Pyrolysis, kerogen typing, vitrinite reflectance from 9 cutting samples. Based on TOC parameter, organic-rich materials in both formations show good to very good quantity. On the other hand, PY parameter shows fair to good potency quality as source rock to generate hydrocarbon. Kerogen type composition dominated NFA which indicates oxidizing marine or lacustrine depositional environment. Sirga and Pre-Faumai Formation show low level maturity based on %Ro and Tmax. On the contrary, based on 1D basin modelling maturity of the source rock on Warir-1X well and WIR-1A (outside research area) show higher level maturity (early to mid-mature) since Middle Pliocene and progressed into late maturity stage on oil generation since Early Pleistocene. Basin polarity reversal occurred since Pliocene and changed basin configuration i.e. depocenter from on southern area becoming on northern area. Sirga and the Pre-Faumai Formation are believed to be the two formations as hydrocarbon generating source rocks in the Salawati Basin based on geochemical characteristics analysis. Maturity based on% Ro shows the level of immature to peak mature.
Echo hiding method for video file message security
Authors: Rahmad C , Muhiqqin I , Patma T S , Ariyanto R , Muna N 
Published: December 2019

Abstract
Sending secret message need an algorithm that can protect message to receiver without knowing by other and keep the originality of message. Previous research, encoding secret message in video inserted in frame while audio secret message inserted in bit audio. it makes it easier for someone to detect the presence of a message. In this paper, try to encode the secret message at video file to encode in audio. Audio separated from video in order to encode secret message in audio. Echo Hiding method used in encode secret message to audio process. Testing use Bit Error Rate (BER) method to analysis modification in audio and Normalized Correlation (NC) analysis authentic the secret message. Based on the experiment, the results obtained were NC values (0.98-1) and BER values (0-3.12). based on the results obtained by the method we can insert messages better than the previous method with the addition of noise elimination in audio.
Iris feature extraction using Gray Level Co-occurrence Matrix and Gabor Kernel filter its impact on iris Huffman compression image
Authors: Asmara R A , Yusron R D R , Rahutomo F , Ariyanto R , Aji D K P , Choirina P 
Published: December 2019

Abstract
Algorithms developed to identify people with iris image data have been tested in many field and laboratory experiment. This paper analysis some a parameters of iris image used to recognize human. Iris recognition system, which is applied based on segmentation, normalization, encoding, and matching is also describe in this paper. Circle Hough Transform segmentation module used to find the inner and outer boundaries of the iris. The experiment was carried out using CASIA v1 iris database with grayscale images. Shape, intensity, and location information for localizing the pupil or iris and normalizing the iris area a used iris segmentation by unwrapping circular area into a rectangular area. Normalized area will be used to extract the features using Gray Level Co-occurrence Matrix (GLCM) and Gabor filter, the feature compared the recognition accuracy using Support Vector Machines (SVM) and Naive Bayes classifiers. GLCM feature test results achieved 95.24% SVM classification accuracy, whereas using achieved 85.71% Naive Bayes. Gabor feature test results achieved 95.24% SVM classification accuracy, whereas using achieved 95.23% Naive Bayes. The classification process based on GLCM and Gabor features show that the SVM method have to highest recognition accuracy compare to Naive Bayes classifier.
The augmented reality application for simulating electromotive force concept
Authors: Bakri F , Sumardani D , Muliyati D 
Published: December 2019

Abstract
The discussion of the concept of electromotive force often leads to misconceptions. Unity program can produce 3-dimensional media from 2-dimensional media. In this article, we will describe the form of electromotive force simulation that is displayed with augmented reality technology. Development of electromotive force simulation using 4D development model (define, design, develop, and disseminate). The application of augmented reality technology can visualize the three-dimensional form of abstract electromotive force processes into reality. The design process is based on pedagogical content knowledge. The electromotive force display can simulate the impact of changes in the number of turns, magnetic fields, and time of playback of the generator against the value of electromotive force. The simulation has succeeded in providing an interesting description of the ratio of variables to the magnitude of the force of electricity produced in the generator. Display simulation electromotive force with augmented reality technology has met the principle of technological pedagogical content knowledge (TPACK).
Development of online learning design
Authors: Rahadian D , Bariyah S H , Nasrullah I , Purwanti Y , Imania K 
Published: December 2019

Abstract
Development research aims to produce online learning designs to enhance the active role of students in utilizing e-learning to support the learning process in project management courses. The research method used in the development of online learning design is the ADDIE Research model starting with conducting analysis and design to define the needs of students in online learning based on learning outcomes in courses, then developing with LMS Moodle, and implemented in IT Project Management courses. Learning design that has been developed in e-learning to support the learning process of IT project management is then validated by several experts, namely software development experts, and learning experts so as to produce a blended learning model. The results showed that online learning design needs were very high to support student activity in using e-learning and received positive responses from students in the use of e-learning to support face-to-face learning in the classroom.
Modified union feature selection method on English translation of hadith text clustering
Authors: Huda A F , Priatna N , Safitri Q U , Darmalaksana W 
Published: December 2019

Abstract
The high feature space (dimension) is one of the main issues to be considered in the text clustering process. Therefore, various dimensional reduction methods have been introduced for selecting informative sub feature. Each method uses a different strategy to select sub feature, and the results are different even if using the same data set. Typically, union methods and intersection methods are used to combine selected sub feature with different reduction methods. The union method selects all feature and intersection only selects the general feature under consideration. Thus, the union approach causes an increase in feature dimensions and the intersection approach causes the loss of some important feature. Therefore, in order to take advantage of a method and reduce its weaknesses, this research proposes new approach, which are called modified union. This approach applies the union methods to select top ranking feature and applies intersection methods to the rest of the feature. In this case, feature selection uses the Term Variance (TV) and Document Frequency (DF) methods to calculate the relevance value of each feature. The effectiveness of the proposed method is tested on the data set of Hadith Shahih Bukhary. The results show that the proposed method improves clustering accuracy over other methods with DB index is 2.7.
Analytical network process method for badminton athlete’s scholarship recommendations
Authors: Andrian R , Fuadi R S , Fahrudin R , Rahman A , Wildanuddin M , Wahana A 
Published: December 2019

Abstract
Pathways admissions line independent achievement sports especially badminton was held in UIN Sunan Gunung Djati Bandung aimed to help athletes who want to proceed to a higher level and change the paradigm of athletes on the importance of continuing education to a higher level in accordance with the specified criteria. The process of input in determining the acceptance still uses old system by Microsoft Excel that sometimes causes confusion. To help determine an independent candidate of badminton accomplishment line, it is then required a decision support system. The Method that can be used for deciding support system by using Analytical Network Process (ANP). Using this method, the calculation was done by doing a comparison between the criteria and alternatives then produce supermatrics, then do the weighting process will determine the athletes who deserve to UIN Sunan Gunung Djati in Bandung. This research used 9 prospective registrants (alternate) as a sample after doing comparison calculation manually and the application of the method itself then acquired relative error of 0%. So the system has been made is said to be worth used relative error less than 50%.
Vocational Education Enterprise Architecture Framework (VEEAF) for supporting business processes on vocational high school
Authors: Adhi B P , Widodo W , Ajie H 
Published: December 2019

Abstract
Technology supports organizational business processes. Advanced and well-established organizations have a variety of activities that are well managed with a framework or architecture. Company architecture is an illustration of how business processes can be managed with the support of various technologies in their environment. The purpose of this study is to develop a framework using enterprise architecture in Vocational High Schools which is an organization in the field of education that needs to develop and adapt to the times. Many activities and business processes in the education sector began to shift from manuals to information technology-based. Research methods developed using the Federal Enterprise Architecture Framework (FEAF) method but are limited to level IV where this level focuses on modeling produced by each cell in the matrix, and the matrix used is in the first row, namely the appearance of planning objectively or coverage. The perspective planner explains the views or estimates of the scope of the system, whether the resulting system will be valuable and how the system will operate. The results of this study are matrix perspective and vocational enterprise education architecture (VEEAF) model in the scope of perspective: finance and assets, registration, cooperation with industry, career center and alumni, academic, Professional Certification Institutions (LSP).
Improving second grade elementary students’ writing and storytelling skills through digital literacy
Authors: Suwarni A Z J , Rahman R , Iswara P D 
Published: December 2019

Abstract
The aims of this study was to improve writing and storytelling skills of second grade elementary school students. Through digital literacy, students can have a meaningful experience when they learn to make and tell a story they have made. Students will be able to explore their competences while using a lot of audiovisual media for finishing writing and storytelling assignment. This research conducted with a qualitative research design by using observation and students’ assessment as research instruments. Based on the findings, a conclusion can be drawn that digital literacy is able to improving second grade students’ writing and storytelling skills
The development 3-D augmented reality animation on radioactive concept
Authors: Permana H , Kencana H P , Bakri F , Muliyati D 
Published: December 2019

Abstract
Augmented Reality is a technology that can provide positive perceptions of lessons, improve learning experiences, and improve learning achievement. It visualizes the phenomenon obtained by the results of laboratory research. This research was to design and develop the marker of radioactive concepts. The stages consist of determine the instructional needs and goals, develop the markers, and quality review. We generate two markers for this concept: radioactive light penetration and radioactive light beam by electric field. The markers were developed based upon the identification of instructional needs and expected to assist in the achievement of the instructional objectives. The results of the development show that AR animation markers on the radioactive concept can be read and have maximum readability of 25 cm.