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The effect of feed rate and inlet air velocity to reduce calcium oxalate on porang chips using micro mill assisted Cyclone separator

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AIP Conference Proceedings 2019年第1期2120卷

作者： Jatmiko Eko Witoyo Simon Bambang Widjanarko Bambang Dwi Argo 1Department of Agricultural Product Technology Faculty of Agricultural Technology Universitas Brawijaya Malang 65145 Indonesia 3Porang Research Center Universitas Brawijaya Malang 65145 Indonesia 2Bioprocess Technology Study Program Department of Agricultural Engineering Faculty of Agricultural Technology Universitas Brawijaya Malang 65145 Indonesia

Porang is the native plant and sources of glucomannan in Indonesia, but the utilization is limited. The presence of calcium oxalate in the porang tuber can cause to the health problem. The milling and air clarifying are the need to eliminate the impurities, i.e. calcium oxalate for producing pure porang flour. The aims of this present research were to know the effect of feed rate and inlet air velocity to reduce calcium oxalate on porang chips using micro mill assisted cyclone separator. This research divided to be 2 stages, the first stage was the determined the condition of feed rate and the inlet air velocity of the cyclone separator, and the second stage was to trial milling with the condition that obtained in the first stage. The result showed the range of feed rate of 45 – 55 kg/h and the inlet air velocity of 3 – 7 m/s. The feed rate and the inlet air velocity had a significant effect (p < 0.05) on the yield, the degree of whiteness, and calcium oxalate of porang flour. Overall, the best treatment was obtained at the feed rate of 50 kg/h and 7 m/s in the inlet air velocity of the cyclone separator.

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Characterization of Oil Shale in the Indragiri Hulu Regency, Indonesia, Based on Organic Geochemistry and Petrography

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IOP Conference Series: Earth and Environmental Science 2019年第1期360卷

作者： M Heri Hermiyanto Zajuli Eddy A Subroto Very Susanto Center of Geological Survey Ministry of Energy and Mineral Resources Jalan Diponegoro Bandung Indonesia Petrology Volcanology and Geochemistry Research Group Geological Engineering Study Program Faculty of Earth Sciences and Technology Institut Teknologi Bandung (ITB) Jalan Ganesa 10 Bandung 40132 Indonesia

Oil shale now becomes important in Indonesia as promising unconventional energy since the conventional oil is decreasing. This study may be classified as a reconnaissance in trying to evaluate oil shale in the Indragiri Hulu Regency, Indonesia that may become source rock of the future unconventional oil. A set of samples comprising thirty-four sediment outcrops have been collected. All samples were screened their richness by analysing their total organic carbon (TOC) and introduced to Rock-Eval pyrolysis apparatus to identify their maturity, type, and also richness. Out of the thirty-four samples, fourteen selected ones were analysed using gas chromatography (GC), sixteen samples for analysis gas chromatography-mass spectrometry (GC-MS), and twenty samples for organic petrography. The sediments could be classified as very good to excellent for their organic richness, in the stage of immature to relatively mature, comprising a mixture between Type I and II kerogens which show oil prone. Petrographic analysis indicates that lamosite contained in the sediments belongs to Rundle type. The Rundle type lamosite that were mainly originated from Pediastrum organisms might indicate that the sediments were deposited in a lacustrine paleoenvironment, i.e. in a specific type of balanced fill basin. It is proven that the studied formation is promising to be source rock for the shale oil that could be exploration target in the near future time.

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The Tensile Strength of Petung Bamboo Fiber Reinforced Epoxy Composites: The Effects of Alkali Treatment, Composites Manufacturing, and Water Absorption

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IOP Conference Series: Materials Science and engineering 2019年第1期547卷

作者： Gunawan Refiadi Yusi Syamsiar Hermawan Judawisastra Mechanical Engineering Vocational Education Study Program College of Teacher Training and Education (STKIP) Sebelas April Jl. Anggrek Situ 10 Sumedang 45323 Indonesia Textile Chemistry Department Polytechnic of Textile Technology Jl. Jakarta 31 Bandung 40272 Indonesia Material Engineering Department Faculty of Mechanical and Aerospace Engineering Bandung Institute of Technology (ITB) Jl. Ganesha 10 Bandung 40132 Indonesia

Natural fiber application due to its competitiveness attracted many research in green composites. However, the tensile properties of natural fiber composites might be influenced by several factors such as treatment of the fibers, manufacturing processes, and water absorption levels. In this research, we use petung bamboo fibers as natural fibers candidate for a good reinforcement in green composites. The study focused on the tensile property of bamboo fiber reinforced epoxy composites due to alkali treatment, manufacturing process, and water absorption. The composites were made with three variations: the fibers were varied without and with alkaline treatment (5% NaOH); manual lay-up method and hot press were applied as manufacturing variation; moisture content in the composites was varied in dry condition and after water absorption treatment. Tensile testing and Scanning Electron Microscope (SEM), were performed to improve tensile strength of composite and fiber-matrix interface quality. The alkali treatment has less effect to the tensile strength than of the volume fraction gain and the void content. Composite manufacturing by hot press has a significant effect to the improvement of tensile strength up to 37% compare to the hand lay-up method. Water absorption up to 8.8% had decreased the tensile strength of composites up to 29%. The alkali treatment on the bamboo fibers had effectively reduced water absorption into the composite as well as the tensile strength reduction.

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Utilization of waste as biogas substrateby dominan microbes identified

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Journal of Physics: Conference Series 2018年第1期1013卷

作者： E Nurlina S Sambasri E Hartati R Safitri A Hodijat Program Study of Electrical Faculty of Engineering UNJANI Cimahi Indonesia Program Study of Environmental Engineering Institut Teknologi Nasional Bandung Indonesia Program Study of Biology Padjadjaran University Bandung Indonesia High School of Agricultural West Java (Sekolah Tinggi Pertanian JABAR) Bandung Indonesia

Indonesia as the tropics have a source of biomass feedstock which is very large, so the waste biomass can be used optimally as an energy source in the form of biogas. This study was conducted to obtain alternative energy from domestic waste materials, given the limited availability of petroleum and natural gas sourced from fossil fuels. This methodology is an experimental method, the process conditions at room temperature 25-27 °C, pH adjusted to the growth of microbes to produce biogas, retention time 20-60 days, the bioreactor is operated with a batch system, the volume of waste in the bioreactor is made permanent, so that the production of biogas in large scale will increase the pressure inside the bioreactor. Biogas is formed accommodated then distributed to the stove. Factors that determine the formation of biogas is a microbial species capable methanogens convert acetate into biogas. From the results of microbial identification of the isolates in the bioreactor, has identified three types of bacteria methanogens namely Methanospirillum hungatei, Methanobacterium polustre and Methanolacinapoynteri. The results of this study, domestic waste can be utilized as a substrate in biogas production, with the highest methane composition reaches 50.79%. This result is expected to increase public knowledge to utilize the waste into biogas as a renewable energy to sufficient the energy needs of household, so it does not depend on the energy derived from fossil fuels.

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Optimization of Frequency and Stirring Rate for Synthesis of Magnetite (Fe 3 O 4 ) Nanoparticles by Using Coprecipitation- Ultrasonic Irradiation Methods

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Procedia engineering 2017年 170卷 55-59页

作者： Retno Rahmawati Mohammad Gilang Permana Bill Harison Nugraha Brian Yuliarto Suyatman Deddy Kurniadi Engineering Physics Department Faculty of Industrial Technology ITB Bandung 40132 Indonesia Physics Study Program Faculty of Sains and Technology UIN SunanKalijaga Yogyakarta 55281 Indonesia

Magnetite (Fe 3 O 4 ) 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 Fe 3 O 4 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 Fe 3 O 4 ranging from 21 to 25 nm depend on the ultrasonic frequency and stirring rate. Meanwhile, the transmission electron microscopy (TEM) result revealed that the Fe 3 O 4 tend to form spherical shape with little agglomeration on the morphology of the Fe 3 O 4 . The magnetic properties of Fe 3 O 4 were investigated by using vibrating sample magnetometer (VSM). The VSM measurement result showed that the Fe 3 O 4 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 Fe 3 O 4 nanoparticles have a potential to be appliedin biomedical field.

关键词： coprecipitation-irradiation ultrasonic Fe 3 O 4 iron sand optimization

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Wireless Disturbance Mapping and Path Selection for Placement of Network Control System Components

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Journal of Physics: Conference Series 2019年第1期1230卷 012025-012025页

作者： Joelianto, Endra Ghazali, Muhammad Zhaka Tutun Juhana Instrumentation and Control Research Group Faculty of Industrial Technology Institut Teknologi Bandung Jl. Ganesha 10 Bandung 40132 Indonesia. Engineering Physics Study Program Faculty of Industrial Technology Institut Teknologi Bandung Jl. Ganesha 10 Bandung 40132 Indonesia. Telecommunication Engineering School of Electrical and Informatics Institut Teknologi Bandung Jl. Ganesha 10 Bandung 40132 Indonesia.

Wireless transmitters in measurement instruments act for transmitting data or signals using radio frequency or currently better known as WIFI by means of 2.4 GHz. WIFI is a wireless local area network (WLAN) communication network. With the existence of telecommunications, measurement and control in industrial processes are heading to a high level of reliability compared to the conventional wired instruments in reaching hard locations or dangerous and hazardous areas. However, this cannot be done easily especially in maintaining the communication performances. Research is needed on the reliability of the wireless transmitter itself. Several factors such as communication disruptions are new challenges for the industry of wireless technology manufacturers to be able to prevent or to minimize errors that can arise in wireless network control systems. Signal strength mapping is needed in designing wireless network control systems. In this paper, the mapping is performed by measuring the signal strength parameters (Power Level) and the use of channels (Channel Usage) at planned locations. The measurement results are then used as sample points in the mapping. Data show that the signal strength measurement at each channel has a maximum of - 60 dBm and a minimum of -105 dBm. Mapping is performed by using two methods, namely Inverse Distance Weight (IDW) and Spline Interpolation (SI) methods. The paper proposes an algorithm to select the appropriate wireless communication paths from the planned locations. The mapping results indicate the appropriate area to place the transmitter and the receiver devices in a wireless data transmission network. With good placement, it is expected that measurements using wireless transmitters have minimum disruptions.

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Quality analog rice composite flour: Modified starch, Colocasia esculenta, Canna edulis Ker high protein

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AIP Conference Proceedings 2018年第1期1977卷

作者： Isti Pudjihastuti Siswo Sumardiono Edy Supriyo Heny Kusumayanti 1Vocational Program Study of Chemical Engineering Diponegoro University Semarang Indonesia 2Chemical Engineering Department Faculty of Engineering Diponegoro University Semarang Indonesia

The demand for domestic rice continues to increase along with population growth, making it difficult for the achievement of national rice self-sufficiency. Therefore, it is necessary to decrease rice demand with food diversification program. Since paddy rice and rice have become food culture of Indonesian people, it is necessary to develop product similar to rice (analog rice) by not changing food preparation at the household level. The purpose of this research is to develop analog rice production method from protein rich composite flour with hot extrusion method. Thermal extrusion technology is expected to produce artificial rice with high quality and nutrition and have physicochemical properties equivalent of rice. There fore, it can be applied as food substitute for rice in realizing Indonesia food security program. The result of chemical analysis shows that the best analog rice in this study contains water 13.455%, carbohydrate 74.972%, protein 8.648% and fat 0.180%. Analog rice amylose content equal to 25.677% included in rice with low amylose.

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Design of conveyor utilization monitoring system: a case study of powder coating line in sheet metal fabrication

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IOP Conference Series: Materials Science and engineering 2018年第1期319卷

作者： Hoedi Prasetyo Yohanes Sugiarto Cucuk Nur Rosyidi Master Study Program of Industrial Engineering Faculty of Engineering Universitas Sebelas Maret Surakarta 57126 Indonesia and Mechatronics Department Politeknik ATMI Surakarta Surakarta 57145 Indonesia Mechatronics Department Politeknik ATMI Surakarta Surakarta 57145 Indonesia Master Study Program of Industrial Engineering Faculty of Engineering Universitas Sebelas Maret Surakarta 57126 Indonesia

Conveyor is a very useful equipment to replace manpower in transporting the goods. It highly influences the productivity, production capacity utilization and eventually the production cost. This paper proposes a system to monitor the utilization of conveyor at a low cost through a case study at powder coating process line in a sheet metal fabrication. Preliminary observation was conducted to identify the problems. The monitoring system was then built and executed. The system consists of two sub systems. First is sub system for collecting and transmitting the required data and the second is sub system for displaying the data. The system utilizes sensors, wireless data transfer and windows-based application. The test results showed that the whole system works properly. By this system, the productivity and status of the conveyor can be monitored in real time. This research enriches the development of conveyor monitoring system especially for implementation in small and medium enterprises.

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Preparation of cellulose nanocrystals from empty fruit bunch of palm oil by using phosphotungstic acid

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IOP Conference Series: Earth and Environmental Science 2018年第1期105卷

作者： Y W Budhi M Fakhrudin N T U Culsum V Suendo F Iskandar Chemical Engineering Study Program Faculty of Industrial Technology Bandung Institute of Technology Bandung 40132 Indonesia Chemistry Study Program Faculty of Mathematic and Science Bandung Institute of Technology Bandung 40132 Indonesia Physics Study Program Faculty of Mathematic and Science Bandung Institute of Technology Bandung 40132 Indonesia

Empty fruit bunch (EFB) of palm oil, an abundant agro-waste in Indonesia, was used as raw material of Cellulose Nanocrystals (CNCs) preparation. Instead of conventional acid mineral, phosphotungstic acid (H3PW12O40, HPW) was used to hydrolyze cellulose due to recycling ability and easy handling. Before hydrolysis process, dried EFB was treated by 3% NaOH solution at 90°C for 2 hours and then bleached using 2% NaClO2 solution at 80°C for 3 hours to remove hemicellulose and lignin. Hydrolysis reaction parameters such as temperature, acid concentration, and reaction time were optimized with fixed solid-liquid ratio of 1:40. Response surface method was used for experimental design to determine the optimum condition of each parameter by using software Minitab. In this study, pulp from dried EFB produced 44.8% yield of CNCs. Dynamic Light Scattering (DLS) analysis showed that most of CNCs equivalent diameter was 140 nm. Crystallinity index was observed at 73.3% using X-ray Diffraction (XRD) analysis. Thus, a green established process for the preparation of CNCs was achieved.

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The Need of Catering Food Materials using Lotting Technique

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IOP Conference Series: Materials Science and engineering 2018年第1期407卷

作者： J Robecca D Sudrajat Study Program of Industrial Engineering Faculty of Engineering and Computer Science Universitas Komputer Indonesia Jl. Dipatiukur no. 112-116 Bandung Indonesia

The purpose of this study is to minimize the purchase cost for each food from the catering menu. Therefore, raw material inventory control method is needed to plan arrival schedule, order schedule, and the amount of ordering of each foodstuff. The technique of determining the amount of ordering (lotting technique) used there are three, namely the least unit cost technique, the lot for lot technique and the least total cost technique. The results of this study indicate that the company can minimize the cost of purchasing food based on lead time, storage time limit, and optimal lotting techniques. Lead time is the period between the order to the delivery time, the storage time limit is how long the best time required for the quality of foodstuffs are maintained, while the lotting technique is the optimal size of order quantity. The lotting technique chosen for each type of food material is different. The cost of purchasing the food consists of the price of the foodstuff, the ordering fee for the type of material and the storage cost for the type of foodstuff. There are 16 types of foodstuffs with the cost of purchasing the smallest raw material with the lot for lot techniques. There are 29 types of foodstuffs with the cost of purchasing the smallest raw materials using the least unit cost techniques. And 10 types of foodstuffs with the least total cost technique as a lotting technique with the purchase of the smallest raw material. Of the 55 types of food raw materials, the company was able to save the cost of purchasing groceries of 33,006,371.75 IDR per month. Of course, in order to apply this planning, the company must provide facilities in order to extend the life of the foodstuff in accordance with predetermined lead time and to ensure the quality of the foodstuff is guaranteed.

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