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Profile of bovine teeth potency as hydroxyapatite scaffold

AIP Conference Proceedings 2023年第1期2536卷

作者： Endanus Harijanto Anita Yuliati Prihartini Widiyanti Dental Material Department Faculty of Dentistry Universitas Airlangga Surabaya Indonesia Biomedical Engineering Study Program Department of Physics Faculty of Science and Technology Universitas Airlangga Surabaya Indonesia

Background: Bone destructions in the oral cavity are due to trauma, chronic infection, congenital malformations, or resection surgery, most often by using an autologous bone graft technique. The problem using this technique are limited donors and suppliers, high cost, host potential imune response becauce accepts foreign bone tissue also potential transmission diseases. Another solution in tissue engineering techniques is using the scaffold. Hidroxyapatite is one of the osteoconductive potentialy ceramic materials in scaffold fabrication. Objective: To prove that bovine teeth hydroxyapatite have characteristic as scaffold for bone tissue regeneration. Methods: HA was obtained by calcining bovine teeth at 1000°C for 3 hours, Fourier Transform Infra Red Spectroscopy (FTIR) test , Energy Dispersive X-Ray (EDX) test and X-Ray Diffraction (XRD) test. Results: Bovine teeth hydroxyapatite to showed of hydroxyl, phosphate and carbonate functional groups (FTIR test). Average Ca/P=1.97. Conclusion: Hydroxyapatite from bovine teeth has potency as scaffold through the chemistry and physical characteristics.

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Analysis Performance of Grid Tie Photovoltaic Type Polycrystalline Using Solar Irradiance Simulation 4

Analysis Performance of Grid Tie Photovoltaic Type Polycryst...

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4th International Conference on Energy, Environment, Epidemiology and Information System, ICENIS 2019

作者： Pratama, Kurniawan Galih Putra Hermawan, Hermawan Andromeda, Trias Magister Study Program of Electrical Engineering Diponegoro University Semarang Indonesia Department of Electrical Engineering Faculty of Engineering Diponegoro University Semarang Indonesia

Indonesia is a country consisting of several islands some of which are still not covered by electricity. It is this source of PV that can be used to meet the needs of people who are not yet affordable with PLN electricity. Basically, PV includes the generation of new renewable energy types. This new form of energy comes from sunlight. Using semiconductor materials can convert energy from sunlight to electrical energy. Because in Indonesia this includes tropical climates located on the equator line, making Indonesia has a very high intensity of light. Several factors affect electrical energy, namely the extent of PV to be used, the total irradiance received by PV, the decrease in performance due to weather and cleanliness of the PV used such as snow and oiliness. In this study explained the Analysis of Irradian-based Grid Tie photovoltaic performance with Polycrystalline PV types. Taking irradian data using a Solar Power Meter, irradiance and temperature data at a certain time will use the Incremental Maximum Power Point Tracking (MPPT) method, DC-DC boost converter, inverter, voltage source converter (VSC) using algorithm and equipment controls connected to network. This research is simulated using Matlab with the Simulink program. © The Authors, published by EDP Sciences, 2019.

关键词： Solar energy

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Single Phase AC Current Controller by Using Hysteresis Method 4

Single Phase AC Current Controller by Using Hysteresis Metho...

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4th International Conference on Energy, Environment, Epidemiology and Information System, ICENIS 2019

作者： Zulkhairi Facta, Mochammad Andromeda, Trias Hermawan Setiawan, Iwan Magister Study Program of Electrical Engineering Diponegoro University Semarang Indonesia Department of Electrical Engineering Faculty of Engineering Diponegoro University Semarang Indonesia

Generally, the electrical power supply acts as a voltage source only but many applications, current sources are needed. In conventional methods, to provide a current source, an electric power supply with variable voltage is adjusted to give the amount of current. In some electrical applications and devices, there is a demand to have a constant voltage with a variable current. This paper proposes a single phase alternating current controller as a power supply with a current source that can be adjusted using the hysteresis method. The advantage of the hysteresis method is that the electric current can follow changes in setting values and have a good response to any changes in the load given. This method, the actual current can follow the reference flow as needed. During testing, the inverter has succeeded in producing 3 Ampere 50 Hz at the output voltage of 50 Volt which is sent to the load. In applications, the proposed power supply is useful as an inverter to convert DC current into AC current. Furthermore, this proposed inverter has the opportunity as a renewable energy resource converter to convert direct current from photovoltaic to alternating current for various electronic devices in industries and households. © The Authors, published by EDP Sciences, 2019.

关键词： Hysteresis

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Simulation of Grid-Tied Photovoltaic System Based on Solar Irradiance and Temperature Data in Semarang 4

Simulation of Grid-Tied Photovoltaic System Based on Solar I...

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4th International Conference on Energy, Environment, Epidemiology and Information System, ICENIS 2019

作者： Fomba, Ahmed Jumui Sumoi Hermawan, Hermawan Andromeda, Trias Facta, Mochammad Setiawan, Iwan Magister Study Program of Electrical Engineering Diponegoro University Semarang Indonesia Department of Electrical Engineering Faculty of Engineering Diponegoro University Semarang Indonesia

This paper presents a simulation of a grid-connected photovoltaic power system. A complex model of power distribution system is developed in MATLAB Simulink, then it will be simulated to determine an amount of power delivered to the grid based on irradiance and temperature. Solar irradiance data collection is conducted using a solar irradiance meter. These weather data (solar irradiances and temperatures) are transformed into signal inputs and model through a grid-tied Photovoltaic (PV) model system which consists of PV, incremental conductance Maximum Power Point Tracking (MPPT) method, DC-DC boost converter, inverter, voltage source converter (VSC) control algorithms, and grid equipment. The output variables can be related to current, voltage or power. However, tracing of the current-voltage (I-V) characteristics or power-voltage (P-V) characteristics are the vital need to grid-tied PV system operation. Changes in solar irradiance and temperature imply changes in output variables. Detailed modelling of the effect of irradiance and temperature, on the parameters of the PV module and the output parameters will be discussed. With the aid of this model, one can have a feasible idea about the solar energy generation potential at given locations. This comprehensive model is simulated using MATLAB/Simulink software. © The Authors, published by EDP Sciences, 2019.

关键词： Solar energy

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study on the waste valve's stroke to water hammer pressure and flow patterns in a hydraulic ram pump

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AIP Conference Proceedings 2023年第1期2568卷

作者： I. P. Widiarta M. Suarda I. G. K. Sukadana M. Sucipta N. M. Suantini I. N. Suweden 1Student at Master Study Program of Mechanical Engineering Faculty of Engineering Udayana University Denpasar Bali Indonesia 2Mechanical Engineering Department Faculty of Engineering Udayana University Denpasar Bali Indonesia 3Chemistry Department Faculty of Mathematics and Natural Science Udayana University Denpasar Bali Indonesia 4Electrical Engineering Department Faculty of Engineering Udayana University Denpasar Bali Indonesia

The pressure in the hydraulic ram pump increases due to a sudden cessation of flow out through the waste valve when the waste valve is closing. The increasing of water hammer pressure is strongly influenced by velocity of the water flow in the drive pipe. Therefore, the waste valve has an important role in mechanism of the occurrence of water hammer pressure, performance, and flow patterns in the hydraulic ram pump. This study investigated the water hammer pressure and the flow patterns in the hydraulic ram pump that has been installed at Bon sub-village, as well as its performance at various strokes of the waste valve. In addition, CFD simulation using Ansys Fluent was conducted. The result show that increasing stroke of the waste valve increase the water velocity in the drive pipe and the water hammer pressure, and the optimum of the waste valve stroke has been predicted subject to volumetric and total efficiency using the equation of their trendlines. Furthermore, the flow patterns such as vortex, split flow, and blockage mass in the hydraulic ram pump have been identified.

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Design and Implementation study of 3.12 kWp on - Grid Rooftop Solar PV System 7

Design and Implementation Study of 3.12 kWp on - Grid Roofto...

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7th International Conference on Electrical engineering and informatics, ICEEI 2019

作者： Mizard, Ariyq Naufal Aryani, Dwi Riana Verdianto, Ariono Hudaya, Chairul Faculty of Engineering Universitas Indonesia Department of Electrical Engineering Indonesia Energy System Engineering Master Study Program Faculty of Engineering Universitas Indonesia Kampus Baru UI Depok 16424 Indonesia

ISBN: (纸本)9781728124186

Conversion of fossil fuels as an energy source can be achieved by optimizing the use of renewable energy. One of the most used renewable energy is solar photovoltaics (PV). At present, solar power plant is an electrification support system for certain buildings because the abundant availability of solar radiation. On this research, Power and energy observations are carried out to determine measure the load power trend, the amount of energy flow from PV to the load, as well as import or export power from or to utility grid by direct measurement on Mosque of faculty of engineering, Universitas Indonesia. According to the study, the highest power generated by solar power plant mostly occurs at 12:00 - 13:00 with the highest power generated by PV is 2,344 W and the exported power is 939 W, and 32.19% - 55.67% electricity energy savings consumption from utility grid. © 2019 IEEE.

关键词： Solar energy

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Multi-perspective review on application of self-healing concrete and its prospect in Asia

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AIP Conference Proceedings 2022年第1期2489卷

作者： Christian Hadhinata Amalina Amira Arini Nurjanna Athalafi Ramadhan Indrasara Nu’matul Hasanah M. Mirza Abdillah Pratama 1Civil Engineering Education Study Program Department of Civil Engineering Faculty of Engineering Universitas Negeri Malang Malang Indonesia 2Biology Study Program Department of Biology Faculty of Mathematics and Natural Science Universitas Negeri Malang Malang Indonesia 3Department of Civil Engineering Faculty of Engineering Universitas Negeri Malang Malang Indonesia

Concrete is the most popular material construction which can be applied in broad construction projects. In addition, concrete is also featured with robust strength, durability, reflectivity, and versatility. However, concrete is prone to rupture that results in decreasing life span and its quality, so it requires additional cost for repair toward its damage. Self-healing concrete is one of the innovations developed by researchers to solve the cracks in concrete allowing the concrete to recover the cracks through the healing process. A self-healing concrete has more superior mechanical properties compared with normal concrete. Self-healing mechanisms can be divided into two types: autogenic and autonomic self-healing. Autogenic self-healing takes advantage of the formation of calcium carbonate crystals from unhydrated cement or mineral particles. Meanwhile, autonomic self-healing uses a healing agent capsulized into microvascular, microencapsulation, and pallets. Researchers applied self-healing concrete on a macro-scale, such as in panel walls, roof slabs, and river floodgates. This paper uses the literature review method to collect the data about self-healing concrete. This study aims to discuss self-healing concrete, its mechanical properties, durability, and analysis of the use of self-healing concrete from multi-perspective disciplines including economy, health and environment, construction, and public policy in Asia’s countries.

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Evaluation of communal wastewater treatment plant based on technical, institutional, and community participation aspects in South Surabaya 1

Evaluation of communal wastewater treatment plant based on t...

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1st International Conference on Science and Technology for Environmental Protection, ICSTEP 2018

作者： Purnawanti, E. Oktavitri, N.I. Isnadina, D.R.M. Fitriani, N. Environmental Engineering Study Program Department of Biology Faculty of Science and Technology Universitas Airlangga Indonesia

This study aims to discover the obstacles and provide recommendations on the technical and institutional aspects of the chosen communal WWTP. The methods used in this study were field survey and questionnaire. the data were analyzed using quantitative, qualitative, and SWOT analysis. There are 11 out of 13 communal WWTPs that do not work optimally. The technical obstacle encountered in the operation of the chosen communal WWTPs is the huge building capacity that does not meet the criteria of HRT design. The recommendations for the technical problem include lowering the water level and reducing the number of baffles in communal WWTP. The obstacle faced in the operation of chosen communal WWTPs in terms of institutional and community participation aspects is that the maintenance is only known by few people. The recommendation for the aspects of institutional and community participation is for KPP to arrange a socialization on the maintenance of communal WWTP based on its maintenance module. © 2019 IOP Publishing Ltd.

关键词： Maintenance

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Analysis of groundwater potential and well discharge to determine of optimal irrigation area, case study: Data watershed, Wajo regency, South Sulawesi province, Indonesia

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AIP Conference Proceedings 2023年第1期2596卷

作者： Suhardi Ahmad Munir Muhammad Tahir Sapsal Agricultural Engineering Study Program Faculty of Agriculture Universitas Hasanuddin Jl. P. Kemerdekaan km 10 Tamalanrea Makassar 90245 Indonesia

Groundwater use for irrigation requires high costs because it requires additional charges in digging wells, pumping units, and operators. In addition, the water flow that can be taken was limited according to the groundwater potential and pump capacity. Therefore, the critical information before pumping groundwater for irrigation is to know the potential of groundwater. Groundwater potential can be predicted based on aquifer description and saturated hydraulic conductivity with pumping test. The data was used to determine groundwater discharge as groundwater potential at the research site as a basis for determining the area that can be irrigated. The research was conducted by interpreting lithological data to determine the description of the aquifer, conducting continuous pumping tests to determine the saturated hydraulic conductivity of the aquifer, determining the groundwater potential using Darcy's approach, and determining the optimal area that can be irrigated based on the groundwater potential and groundwater needs of rice. The results showed that the hydraulic conductivity of the aquifer was 16.30 m/d which indicated that the aquifer was sandy. The groundwater potential in the study area is about 509.38 l/s, can irrigate rice fields of 489.79 ha, and for one well, it can irrigate about 1.5 ha in conditions without rain.

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Perception of the community on the use of biogas as alternative energy (Case study: Jetak Village, Getasan sub district)

Perception of the community on the use of biogas as alternat...

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Life and Environmental Sciences Academics Forum 2018, LEAF 2018

作者： Putri, A. Purwanto Purnaweni, H. Study Program of Environmental Science School of Postgraduate Studies Diponegoro University Semarang Indonesia Faculty of Mathematics and Natural Sciences Semarang State University Semarang Indonesia Faculty of Chemical Engineering Diponegoro University Semarang Indonesia Faculty of Social Science and Political Science Diponegoro University Semarang Indonesia

The purpose of this research is to know public perception of biogas users in Jetak Village, Semarang Regency viewed from technological aspect, technical (biogas installation), biogas benefit, economy and environment. The method used qualitative descriptive with qualitative descriptive approach. The technique of determining key informants was done by purposive sampling. Data were obtained from cattle ranchers who lived in the study sites through interviews, observation and documentation. The result of this research is overall the perception about biogas energy get a positive response from user society. However, there are some things that should be considered for the government and others in providing assistance that is necessary to consider the evaluation and monitoring periodically so that the constraints experienced by the user community can be known early and can be found right solutions. In addition, the sustainability of the use of biogas energy can be done from generation to generation not just the aid which in the end becomes only useless materials. © 2020 IOP Publishing Ltd. All rights reserved.

关键词： Biogas

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