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The risk analysis of rice husk of co-firing fuel for boilers in sugar mills

Journal of Physics: Conference Series 2020年第1期1446卷

作者： Yunaidi F Surahmanto S Harnowo Mechanical Engineering Study Program Politeknik LPP Yogyakarta Indonesia Department of Mechanical Engineering Education Universitas Negeri Yogyakarta Indonesia

Biomass is a very important energy source in the sugar mill industry as the main fuel in the power plant boilers. The efficiency of boilers for most sugar mills in Indonesia is quite low and the availability of bagasse is lacking so that in its operations, co-firing has to be applied with an alternative biomass fuels such as rice husk, cane trash, wood and saw dust. Based on the analysis, rice husk has a lower calorific (3248 cal/gr) value than that of bagasse (4076 cal/gr), but it has a higher ash content (20.67%) than that of bagasse (3.66%), so adjustments in boiler operation is required when using rice husk as co-firing. The higher ash content in biomass can affect the performance of the furnace and superheater in the boiler and increase the potential for deposit formation. The composition of rice husk ash was dominated by silica (SiO2) which reached 95.52%. It is higher than the silica content of bagasse which reached 74.99%. The high silica content in rice husks has the potential to conduce melting ash in boiler grate. The alkali content of rice husk which was around 3.64% is less than that found in bagasse which reached 17.33%. Even though, the ash composition analysis shows quite small potential for slagging, fouling, melting, sintering, and agglomeration, but the large amount of ash content in rice husks can increase the potential for the occurrence of the risks.

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Implementation of the Lagrange interpolation function in the motion planning system of a 1 DOF robot arm

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AIP Conference Proceedings 2023年第1期2706卷

作者： Setyo Supratno Subekhan Awaludin Mukhamad Sugeng Seta Samsiana Taufiqur Rokhman M. Amin Bakri Electrical Engineering Study Program Faculty of Engineering Islamic University “45 Bekasi Bekasi Indonesia Mechanical Engineering Study Program Faculty of Engineering Islamic University “45 Bekasi Bekasi Indonesia

A manipulator robot is a robot that has a mechanical system consisting of an arrangement of arms and joints that can produce controlled movements. A robotic arm usually consists of several joints including the base, shoulder, elbow, roll, gripper, and pitch of the gripper. Robot movement is generated from mathematical calculations performed in the controller. The motion of the manipulator robot follows a motion trajectory. The motion trajectory is made based on a collection of stop points and effectors. This study aims to create a robot motion trajectory design system using Lagrange interpolation. Lagrange interpolation is engineered to be embedded in precise microcontroller control systems. In this study, an Arduino Uno R3-based microcontroller was used as a data acquisition module. Prediction of the robotic arm's trajectory has been successfully made using Lagrange interpolation. The rise time is 15 seconds, the delay time is 12 seconds, the steady-state time and the peak time are 21 seconds. While the second experiment increased 9 seconds, 7 seconds of delay, steady-state time, and 13 seconds of peak time. Then for the third experiment, the rise time is 17 seconds, the delay time is 14 seconds, the steady-state time and the peak time are 22 seconds, the overshoot value and the steady-state error value is 0% where the output value produced is by the input value.

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Design of Single Stage Axial Turbine with Constant Nozzle Angle Blading for Small Turbojet

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Journal of Physics: Conference Series 2018年第1期1005卷

作者： F Putra Adnan Firman Hartono Aeronautics and Astronautics Study Program Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung

In this paper, an aerodynamic design of a single stage gas generator axial turbine for small turbojet engine is explained. As per design requirement, the turbine should be able to deliver power output of 155 kW at 0.8139 kg/s gas mass flow, inlet total temperature of 1200 K and inlet total pressure of 335330 Pa. The design phase consist of several steps, i.e.: determination of velocity triangles in 2D plane, 2D blading design and 3D flow analysis at design point using Computational Fluid Dynamics method. In the determination of velocity triangles, two conditions are applied: zero inlet swirl (i.e. the gas flow enter the turbine at axial direction) and constant nozzle angle design (i.e. the inlet and outlet angle of the nozzle blade are constant from root to tip). The 2D approach in cascade plane is used to specify airfoil type at root, mean and tip of the blade based on inlet and outlet flow conditions. The 3D approach is done by simulating the turbine in full configuration to evaluate the overall performance of the turbine. The observed parameters including axial gap, stagger angle, and tip clearance affect its output power. Based on analysis results, axial gap and stagger angle are positively correlated with output power up to a certain point at which the power decreases. Tip clearance, however, gives inversely correlation with output power.

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The effect of air temperature on rice drying rate using vertical drying machine

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IOP Conference Series: Earth and Environmental Science 2019年第1期355卷

作者： Syahrul S Bahri M Mirmanto Nurchayati Sukmawaty GMD Putra Mechanical Engineering Department Mataram University Indonesia Agricultural Engineering Study Program Mataram University Indonesia

mechanical dryer usually using heat from combustion and air is blown through heater to the product dried. This study was conducted used a vertical dryer. The purpose of this study was to find out the effect of air temperature to drying rate and drying efficiency. The variation of the temperature used were 50°C, 55°C, and 60°C with a tolerance of ± 1 °C with a constant mass of 20kg. The result of this study showed that the higher the dryer air temperature used, the faster the drying rate and drying time. It was found that the fastest drying rate for 60°C was 0.00033804 kg/s with drying time 70 minutes. While for temperature of 50°C found the longest drying rate of to reach a moisture content of 13.8% of 0.00022571 kg/s with constant air velocity of 5 m/s. The highest dried efficiency occurs at a temperature 60°C.

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Compact localized states and flat-band generators in one dimension

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Physical Review B 2017年第11期95卷 115135-115135页

作者： Wulayimu Maimaiti Alexei Andreanov Hee Chul Park Oleg Gendelman Sergej Flach Center for Theoretical Physics of Complex Systems Institute for Basic Science (IBS) Daejeon 34051 Republic of Korea Basic Science Program Korea University of Science and Technology (UST) Daejeon 34113 Republic of Korea Faculty of Mechanical Engineering Technion Haifa 3200003 Israel New Zealand Institute for Advanced Study Center for Theoretical Chemistry & Physics Massey University Auckland 0745 New Zealand

Flat bands (FB) are strictly dispersionless bands in the Bloch spectrum of a periodic lattice Hamiltonian, recently observed in a variety of photonic and dissipative condensate networks. FB Hamiltonians are fine-tuned networks, still lacking a comprehensive generating principle. We introduce a FB generator based on local network properties. We classify FB networks through the properties of compact localized states (CLS) which are exact FB eigenstates and occupy U unit cells. We obtain the complete two-parameter FB family of two-band d=1 networks with nearest unit cell interaction and U=2. We discover a novel high symmetry sawtooth chain with identical hoppings in a transverse dc field, easily accessible in experiments. Our results pave the way towards a complete description of FBs in networks with more bands and in higher dimensions.

关键词： Electronic structure 1-dimensional systems Electron-correlation calculations Lattice models in condensed matter

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Biosilica forming by sol-gel extraction method of rice husk ash

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AIP Conference Proceedings 2023年第1期2630卷

作者： Lydia Anggraini Putri Laila Anggraina Temmy Wikaningrum Study Program of Mechanical Engineering President University Cikarang Bekasi West Java Indonesia Study Program of Environmental Engineering President University Cikarang Bekasi West Java Indonesia

Indonesia, as an agricultural country, produces much waste, especially from rice husk, which is a source of silica (SiO2) production. Rice husk contains about 87% - 97% SiO2 after complete combustion. SiO2 extraction from ash of rice husk is carried out using an extraction process of solid-liquid with an alkaline as a solution solvent. The solid-liquid extraction process was done with 10 grams mass of rice husk ash added with 80 ml of potassium hydroxide (KOH) solution with a concentration of 10%, 15%, and 20% to extract the SiO2 content with an operating time of 60 minutes. After the extraction process is complete, the solution is added with 1 N hydrochloric acid (HCl) to precipitate the SiO2. The SiO2 formed is then separated from the rest of the solution by filtration. The drying process is carried out to remove the moisture content of the resulting SiO2. In this systematic study, HCl-washed rice husks were carried out in a muffle furnace for 60 minutes. The results showed that the samples produced SiO2 with a polycrystalline structure, as confirmed by the results of analysis of the Energy-Dispersive X-ray Spectroscopy (EDS) that could be produced by solid-liquid extraction of KOH from rice husks ash. The amorphous SiO2 has potential application as natural filler in rubber and environmentally friendly natural compounds.

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Energy Optimization Modeling of Geothermal Power Plant (Case study: Darajat Geothermal Field Unit III)

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IOP Conference Series: Earth and Environmental Science 2016年第1期42卷

作者： R H M Sinaga P S Darmanto Engineering Management Study Program Del Institute of Technology Laguboti Toba Samosir 22381 Indonesia Mechanical Engineering Study Program Bandung Institute of Technology Bandung 40132 Indonesia

Darajat unit III geothermal power plant is developed by PT. Chevron Geothermal Indonesia (CGI). The plant capacity is 121 MW and load 110%. The greatest utilization power is consumed by Hot Well Pump (HWP) and Cooling Tower Fan (CTF). Reducing the utility power can be attempted by utilizing the wet bulb temperature fluctuation. In this study, a modelling process is developed by using engineering Equation Solver (EES) software version *** possibility of energy saving is indicated by Specific Steam Consumption (SSC) net in relation to wet bulb temperature fluctuation from 9°C up to 20.5°C. Result shows that the existing daily operation reaches its optimum condition. The installation of Variable Frequency Drive (VFD) could be applied to optimize both utility power of HWP and CTF. The highest gain is obtained by VFD HWP installation as much as 0.80% when wet bulb temperature 18.5 °C.

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Repowering of a synchronous generation plant by induction generator

Repowering of a synchronous generation plant by induction ge...

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CHILEAN Conference on Electrical, Electronics engineering, Information and Communication Technologies (CHILECON)

作者： Alana S. Magalhaes C. A. Leovir Calebe A. Matias Alan H. F. Silva Elder G. Domingues Aylton. J. Alves Wesley P. Calixto Program in Electronic Systems and Automation University of Brasilia (UnB) Brasília Brazil Experimental and Technological Research and Study Group (NExT) Federal Institute of Goias (IFG) Goiânia Brazil School of Electrical Mechanical and Computer Engineering Federal University of Gouias (UFG) Goiânia Brazil

ISBN: (纸本)9781467387576

This work proposes itself through mathematical modeling, simulating the electrical interactions between two electrical generators, an induction generator and a synchronous generator connected to a common bus in steady state, subject to non-linear load. By comparing the modeling of the two machines, we can see that the induction generator will present best way for the harmonic currents flowing in common bus. Experimental tests have confirmed the results of comparative modeling of the electric generators. It was evident that the induction generator, in addition to increasing the active power to the electrical system, could reduce current harmonics components present at the connection point improving the voltage profile in the network.

关键词： Induction generators Harmonic analysis Synchronous generators Power system harmonics Reactive power

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mechanical properties of fly ash-based geopolymer concrete using variation in maximum size of coarse aggregate

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Journal of Physics: Conference Series 2020年第1期1469卷

作者： Y Patrisia R Coenraad N A Inderawan E Elidad Study Program of Building Engineering Education University of Palangka Raya Palangka Raya Indonesia Study Program of Mechanical Engineering Education University of Palangka Raya Palangka Raya Indonesia

The aim of this research was to study the mechanical properties (compressive strength and splitting-tensile strength) of fly ash-based geopolymer concrete using variation in the maximum size of coarse aggregate. The mode of study was laboratory research. Fly ash obtained from Asam-Asam Steam Power Plant, South Kalimantan, Indonesia. The maximum size of coarse aggregate was 10 mm, 20 mm and 30 mm. The geopolymer concrete proportion divided into 3 different mixtures and each contained 400 kg/m3 of fly ash. The alkaline activator used as sodium silicate and 10M sodium hydroxide in the ratio 2:1. The ratio of alkaline activator to fly ash was 0.4. Cylindrical specimens (size 100 mm x 200 mm) counted 10 pieces for each mixture proportion and cured at ambient condition. The test result showed that average of compressive strengths and splitting-tensile strengths for specimens with 10 mm, 20 mm, and 30 mm maximum size of aggregate at the age of 21 days were 11.04 MPa and 6.12 MPa, 10.82 MPa and 5.22 MPa, 10.06 MPa and 4.84 MPa respectively. In conclusion, the greater the maximum size of coarse aggregate, the smaller the value of compressive strength and splitting-tensile strength.

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Impact of AI Anxiety on Educators Attitudes Towards AI Integration

Impact of AI Anxiety on Educators Attitudes Towards AI Integ...

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Creative Communication and Innovative Technology (ICCIT), IEEE

作者： Michael Christian Guan Nan Kurnadi Gularso Yuli Kartika Dewi Sunarno Suryo Wibowo Dept. of Management Bunda Mulia University Jakarta Indonesia Dept. of Mandarin Study Program Bunda Mulia University Jakarta Indonesia Dept. of Graduate School of Business Universiti Sains Malaysia Surabaya Indonesia School of Business Management Ciputra University Penang Malaysia Dept. of Mechanical Engineering Tama Jagakarsa University Jakarta Indonesia Dept. of Medical Profession Study Program Krida Wacana Christian University Jakarta Indonesia

ISBN: (数字)9798350367492

ISBN: (纸本)9798350367508

The present progress in implementing artificial intelligence (AI) has encountered attitudes in human existence, encompassing both professional and everyday aspects, particularly within higher education. AI does not exclude those with anxiety, especially social anxiety, over the existence of technology and all types of complexity. Several types of research have established a correlation between social and technical blindness and views toward broad AI usage. However, no specific gender or age-generation characteristics have been identified. This study employs quantitative research methodology, specifically Smart-PLS software for PLS-SEM modelling. The research included a sample of 93 lecturers, both male and female, from generations X and Y in Indonesia. The findings of this study demonstrate that social technical blindness detrimentally impacts individuals’ views toward the utilization of AI. From a gender standpoint, the path coefficients have no notable disparity. Therefore, the path coefficients for both women and men are not significantly distinct. Consequently, the need for greater awareness and understanding of AI’s social and technological aspects impacts both women and men. This research provides practical implications by enhancing instructors’ comprehension and perception of AI’s efficacy, aiming to mitigate prevailing concerns. In theory, this research enhances the concept of self-determination theory. Subsequent investigations can include the constraints of this study, such as the specific nature and duration of artificial intelligence utilization.

关键词： Training Seminars Ethics Data privacy Anxiety disorders Psychology Focusing Blindness Software Artificial intelligence

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