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Effects of slurry concentration and rotational speeds of drum drier to the characteristics of pregelatinized breadfruit (Artocarpus altilis) flours

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IOP Conference Series: Materials Science and engineering 2019年第1期557卷

作者： T C Sunarti W S L Br. Sinaga C Pandji Department of Agroindustrial Technology Faculty of Agricultural Engineering and Technology Bogor Agricultural University Indonesia Program Study of Food Science Faculty of Science and Technology University of Pelita Harapan Tangerang Indonesia

Breadfruit is one alternative carbohydrate source in Indonesia. However, breadfruit is seasonal and climacteric crops; it should be processed immediately to produce flour. Native breadfruit flour has many limitations since it is difficult to be solubilized and swollen in cold water. The flour is modified physically by pregelatinization to improve its properties. Pragelatinized breadfruit flour can be used as instant food, porridge, and baby food. This research is aimed to investigate the effect of slurry concentration (20 and 30%) of native breadfruit flour and rotational speeds (4, 6 and 8 rpm) of double drum drier to the chemical composition and physico-chemical properties of the pregelatinized flours. The results showed that pregelatinization did not influence to the chemical composition. Pregelatinization of the flour improved the water solubility and swelling power on room (30°C) and hot (70°C) solutions, reduced the freeze-thaw stability, caused partial gelatinization which is monitored by losing the birefringence of starch granule, and darkened the flour. The pregelatinization also reduced the gelatinization temperature and had low final viscosity. Low concentration of slurry and low rotation speed of drum increased the gelatinized part of the flour, which is influenced to the cold and hot water solubility.

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Chemistry in context: The development of hydrocarbon chemistry and petroleum module based on vehicle case

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Journal of Physics: Conference Series 2019年第1期1156卷

作者： Febrianto A Wiyarsi C F Partana B Sulistyo Study Program of Chemistry Education Faculty of Mathematics and Natural Sciences Universitas Negeri Yogyakarta Indonesia Department of Chemistry Education Faculty of Mathematics and Natural Science Universitas Negeri Yogyakarta Indonesia Automotive Engineering Education Department Faculty of Engineering Universitas Negeri Yogyakarta Indonesia

This study aims to analyze the characteristic, feasibility, teachers' and students' responses of Hydrocarbon Chemistry and Petroleum (HCP) module based on the context of vehicle case on automotive engineering. Exploratory mixed method has been employed in this research. The research procedures used four steps including qualitative, development, quantitative, and interpretation step. The instruments used to collect the data consisting the three questionnaires, one open questionnaire to obtain the validation and two close questionnaires to collect the teachers and students' responses toward the HCP module. HCP module based on the context of vehicle case on automotive engineering program was yielded as a result of this reseach. The characteristic of research product was integrating between chemistry and automotive subject based on basic competence of curriculum and integrated by vehicle context in first chapter, concept map, activities, examples, and exercise. A group of experts consisting two lectures were confirmed that the HCP module has a correct chemistry content. A very good category was given as the response of the teacher. Moreover, the students response were very interest toward the HCP module. The students and the tachers could be utilize the HCP module as learning sources reference to gain a succesfull chemistry learning.

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Evaluation of Heavy Metal Exposure to Soil and Paddy Plant around the Closed Municipal Solid Waste Landfill: Case study at Gunung Tugel Landfill, Banyumas-Central Java

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IOP Conference Series: Materials Science and engineering 2018年第1期299卷

作者： Kasam Suphia Rahmawati Fajri Mulya Iresha Dhandhun Wacano Ida Farida Fauziah Muhammad Afif Amrullah Environmental Engineering Study Program Faculty of Civil Engineering and Planning Universitas Islam Indonesia Yogyakarta Indonesia

This work was focused on assessing the exposure of heavy metal from closed municipal solid waste (MSW) landfill on soil and paddy plants. This study aimed to determine heavy metal content whether at the soil in the around Gunung Tugel landfill included and accumulated in the paddy plant tissues. The investigated metals include chromium (Cr), copper (Cu), cadmium (Cd), iron (Fe), and zinc (Zn). The samples were acid-digested before the desired elements were measured using Atomic Absorption Spectrophotometry (AAS). The results are presented as distribution map of the landfill area based on the total heavy metals content distribution in the soil and paddy plants. The samples shown that the concentrations of heavy metals around Gunung Tugel landfill are 6.27-34.71 mg/kg, 0.17-0.42 mg/kg, 28.29-48.69 mg/kg, 18,997.26-32,572.29 mg/kg, 342.74-834.49 mg/kg, 136.10-290.14 mg/kg at the top soil and 0.00-1.70 mg/kg, 0.00-0.26 mg/kg, 0.79-10.46 mg/kg, 13.88-61.46 mg/kg, 18.79-50.56 mg/kg, 87.27-273.22 mg/kg at the paddy for Cr, Cd, Cu, Fe, Mn, and Zn respectively. According to the results, The Gunung Tugel landfill is not a direct source of heavy metal pollution at paddy plant in the landfill area, but through surface water and soil media. Rainfall around landfill is quite high ie more 2000 mm/year of rainfall and soil permeability is 1.0 cm/sec.

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Automotive engineering chemistry module: Exploring acid base and electrochemistry topic in vehicle context

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Journal of Physics: Conference Series 2019年第1期1156卷

作者： H Febiana C F Partana A Wiyarsi B Sulistyo Study Program of Chemistry Education Faculty of Mathematics and Natural Sciences Universitas Negeri Yogyakarta Indonesia Chemistry Education Department Faculty of Mathematics and Natural Science Universitas Negeri Yogyakarta Indonesia Automotive Engineering Education Department Faculty of Engineering Universitas Negeri Yogyakarta Indonesia

The research purposed to analyze the characteristics of chemistry module on acid-base and electrochemistry topic based on vehicle context, to analyze the feasibility of module according to chemistry learning experts and to analyze the response of chemistry teachers and students of Automotive engineering program (AEP) about this module. This research using mixed methods and exploratory model design. The data collected from expert validation sheets also teachers and students response questionnaire. Technique of data analysis begins by converting qualitative data into quantitative data using Likert scales. Furthermore, the total and average score of each component can be determined from the quantitative data. The result of the average scores were converted into qualitative feasibility criteria according to the rating category. The product of the development was a chemistry module on acid-base and electrochemistry topic based on vehicle context for students in AEP. The experts considered feasibility of the module. This module had assessed by 5 teachers and 10 students. The module assessed by teachers showed a very good response while the module assessed by students showed a good response. Therefore, this module is feasible and can be used as a learning resource for students of AEP to enhance quality of chemistry learning.

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SAEnet: an application for adjustment of horizontal network using particle swarm optimization algorithm

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IOP Conference Series: Earth and Environmental Science 2019年第1期389卷

作者： A Hafid D N I Sari F Sobatnu Study Program of DIII Geodesy Department of Civil Engineering Politeknik Negeri Banjarmasin Brigjen H. Hasan Basri St Kayu Tangi Banjarmasin 70123 Indonesia

The horizontal network of control stations plays an important role in geometric measurement activities, such as determining positions of point, distance, area, or even volume. One of the methods of determining horizontal network values is the least squares method. The method of least squares is one of the most frequently used methods to obtain unique estimates for a set of redundant measurements. The equations that are used in the horizontal network surveys are the nonlinear equations so it must be linearized in order to be computed using least squares method. The problem that arises when linearizing the nonlinear observation equation is the approximate coordinates of the network stations are needed for its computations. In order to handle this problem, the Particle Swarm Optimization (PSO) algorithm is applied as an algorithm for determining the approximate coordinate values of the network stations. The algorithm of PSO is a heuristic function that optimizes a problem by iteratively trying to improve a candidate solution toward the best solutions. The advantages of PSO are that PSO is designed for solving a problem more quickly when classic methods are too slow and finding an approximate solution when classic methods fail to find any exact solution. This paper presents the design of an application for horizontal network adjustment using PSO algorithm, namely SAEnet. The Algorithm was written in Matlab which is very effective in matrix manipulation and has been widely used in various fields of numerical computations. The computation of horizontal network adjustment using SAEnet application consists of determination of initial approximation values using PSO and the adjustment computation using the least squares method. SAEnet is also equipped with save menu to Microsoft Excel format and load menu from Microsoft Excel format. The test shows that the input and output of the program can run as expected. The results are then compared to other program, like STAR*NET, usin

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The cellular voice traffic profiling spatial urban land use for South Jakarta

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IOP Conference Series: Earth and Environmental Science 2020年第1期481卷

作者： H M Taki B M Djaja T Nurlambang M Z Lubis R H Koestoer Department of Urban and Regional Planning Faculty of Environmental Design King Abdulaziz University Jeddah Saudi Arabia Department of Archaeology Faculty of Humanities Universitas Indonesia Depok 16424 Indonesia Department of Geography Faculty of Mathematics and Natural Sciences (FMIPA) Universitas Indonesia Depok 16424 Indonesia Department of Geomatics Engineering Batam State Polytechnic Batam 29461 Indonesia Study Program of Enviromental Sciences Universitas Indonesia. 10430 Indonesia

Cellular traffic in the literature can be classified into voice, SMS, and data. Along with the rapid development of internet technology, a cellular operator is required to have spatial-based customer behavior information as the primary data in making business policy. The use of cell phone in Jakarta is remarkably recorded, while competitors among cell phone providers unavoidably follow the costumers' behaviors. Combined methods are applied such as statistical analysis of ANOVA and multiple comparison tests supplemented by the spatial techniques using Geographic Information System (GIS) to review the time and area differences of the voice traffic changes. A cellular provider name Indosat is chosen as a case of voice traffic model data. Simple land-use types of residential classifications are set up and isolated rings of Von Thunen are reconstructed to explain more on the relationship between voice traffic of cell phone and land use distribution. The result of research indicates that the voice traffic highly varies among residential strata and commercial areas. In addition, voice traffics vary between weekdays and weekends depending on the accumulated users.

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Optimization of frequency and stirring rate for synthesis of magnetite (Fe3O4) nanoparticles by using coprecipitation- Ultrasonic irradiation methods

Optimization of frequency and stirring rate for synthesis of...

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2016 engineering Physics International Conference, EPIC 2016

作者： Rahmawati, Retno Permana, Mohammad Gilang Harison, Bill Nugraha Yuliarto, Brian Suyatman Kurniadi, Deddy Engineering Physics Department Faculty of Industrial Technology ITB Bandung40132 Indonesia Physics Study Program Faculty of Sains and Technology UIN SunanKalijaga Yogyakarta55281 Indonesia

Magnetite (Fe3O4) nanoparticles from iron sand as starting materials have been successfully synthesized by using coprecipitation- ultrasonicirradiation methods. This paper reports the preparation and optimization result of ultrasonic frequency and stirring rate during the synthesis process. The frequencies of ultrasonic conducted in this research are 300, 400 and 400 kHz. The stirring rates performed in the synthesis process are varied from 500 to 900 rpm. The qualitative analysis by using X-Ray Diffractometer (XRD) showed that the structure of Fe3O4 nanoparticles have a same phase with ICCD No. 75-0449. Moreover, the quantitative analysis by using Debye-Scherer equation showed that the crystallite size of Fe3O4 ranging from 21 to 25 nm depend on the ultrasonic frequency and stirring rate. Meanwhile, the transmission electron microscopy (TEM) result revealed that the Fe3O4 tend to form spherical shape with little agglomeration on the morphology of the Fe3O4. The magnetic properties of Fe3O4 were investigated by using vibrating sample magnetometer (VSM). The VSM measurement result showed that the Fe3O4 have saturation magnetization (Ms), remanent magnetization (Mr) and coercivity field (Hc) at 25 emu/gram, 6,0562 emu/gram, and 0,0108 T, respectively. Based on the magnetic characterization, the Fe3O4 nanoparticles have a potential to be appliedin biomedical field. © 2017 Published by Elsevier Ltd.

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Coupled Hydraulic and Mechanics Finite Element Modeling of CO2 Injection into a Layered Isotropic Media Using FEHM

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IOP Conference Series: Earth and Environmental Science 2019年第1期318卷

作者： Herdis Haerusalam David P. Sahara Fatkhan Study Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Insitut Teknologi Bandung Ganesha 19 Bandung 40132 Indonesia Exploration and Engineering Seismology Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 Indonesia

CO2 injection into the hydrocarbon reservoir affects the subsurface mechanics and hydraulic condition. The injection has to be performed in a way that there will be no reservoir and/or top seal failure. In such case, a simulation of the injected fluid propagation needs to be performed to see its possible impact to the top seal and existing major faults. We use finite element method to perform this injection simulation. In this research, we use open source software Finite Element Heat and Mass Transfer Code (FEHM) to simulate CO2 injection processes into reservoir. Subsurface geological model was constructed in a dimension of 3000 m (easting) x 3000 m (northing) x 2000 m (vertical). Vertically, it consists of four layers which represent upper layer (400 m), top seal (200 m), reservoir (900 m), and basement (500m). The grid around the reservoir rocks is refined to give more detail results. The open hole injection is set at 850 - 890 m depth, 1500 m easting and 1500 m northing. The material is assumed to be isotropic. The initial pressure and temperature increase as a function of depth with a pressure gradient of 0.00981 MPa/m and a temperature gradient of 0.025 degrees C/m. A vertical fault is modelled at 600 m eastern to the injection well. Injection process is carried out with 6 kg/s of CO2 injection with simulation time for ten years to see its impact to the fault. A vertical fault is The modelling results show that the CO2 injection will not reactivate the fault at 10 years.

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Spatial distribution of soil water content in potato horizontal-ridge profile under various ridge dimensions

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IOP Conference Series: Earth and Environmental Science 2019年第1期406卷

作者： Krissandi Wijaya Purwoko Hari Kuncoro Ardiansyah Poppy Arsil Hilda Ary ani Study Program of Agricultural Engineering Department of Agricultural Technology Faculty of Agriculture Jenderal Soedirman University Jl. dr. Soeparno Karangwangkal Purwokerto 53123

Vertical (slopping)-ridge is generally applied to cultivate potato crop in tropical highland area with intensive use of non-organic fertilizer, by which the soil erosion as well as environmental degradation might be significantly accelerated. On the other hand, horizontal (contour)-ridge has been very effective to reduce the soil erosion in potato cropping field, but yet slightly ineffective to support the optimal crop production, due to the waterlogging in the ridge profile. Dimension of the horizontal-ridge is expected to affect water distribution as well as the waterlogged condition, on which a specific study need to be focused, in order to develop an appropriate drainage system on the ridge. This study was aimed to characterize the spatial distribution of soil water in the horizontal-ridge profile under various ridge dimensions. Totally 9-potato-plots of 300 x 300 cm2 with 5% slope were prepared in Serang village, Purbalingga with various dimensions and replications of the horizontal ridges: 30 x 30 x 30 cm3 (G30), 30 x 40 x 30 cm3 (G40), and 30 x 50 x 30 cm3 (G50). Of each plot, the dielectrically (volumetric)-water content of the horizontal-ridge soil within the grid of 80 x 80 cm2 at the depth of 5, 10, and 20 cm were measured every months using EC5 moisture sensors and EM50 data logger, and then averaged. Based on the given grid, the data were plotted in contour pattern and were then analysed using semivariogram (Gstat and GNUplot) to characterize the spatial distribution and variability, respectively. The results showed that the spatial distribution of dielectrically (volumetric)-water contents tended to be inter-correlated within each ridge dimension, and the data were increased with soil depth and ridge dimension increment. Accordingly, the data were spatially-correlated with sill (C, semivariance) ranged from 0.00084-0.00429 cm3 cm−3 and range of influence (a) ranged from 0.624 - 2.809 m, in which the G50 had most representative and stable trend of the s

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The minimum water curing recovery time after burning of aluminium fiber light weight concrete (with alwa as coarse aggregate) modulus elasticity

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AIP Conference Proceedings 2019年第1期2114卷

作者： Antonius Mediyanto Endah Safitri Wibowo Johannes Berchman Irawan Sunu Widagdo 1)Engineering Faculty Civil Engineering Program Universitas Sebeleas Maret. Surakarta Central Java Indonesia 2)Stundent Engineering Magister Environment Science Universitas Sebelas Maret. Surakarta Central Java Indonesia

The research concerns on the strength of light weight concrete with aluminum fiber as micro-reinforcement by environmental load especially burning and water curing. The purpose of this study was to determine the minimum time of water curing required to obtain full recovery of modulus elasticity. A cylindrical concrete of 150 mm in diameter and 300 mm in height was produced for compressive test. Fiber volume fraction are 0.75% of concrete. Aluminum fiber with aspect ratio of 60, cement type I, sand, alwa as coarse aggregate, water, and viscocrete are used. Testing are based on SK SNI M–14–1989–F. The result shows that the minimum recovery time to the modulus elasticity of lightweight concrete are 56 days water curing, while for aluminum fiber lightweight concrete required a shorter time for full recovery of 42 days. It could be concluded that water curing can self-heal light weight concrete and aluminum fiber light weight concrete after burning.

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