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Single cell protein production by a local Aspergillus niger in solid state fermentation using rice straw pulp as carbon source: Effects of fermentation variables 1

Single cell protein production by a local Aspergillus niger ...

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1st International Symposium of Indonesian Chemical engineering, ISIChem 2018

作者： Said, S.D. Zaki, M. Asnawi, T.M. Novita, E. Chemical Engineering Department Faculty of Engineering Syiah Kuala University Darussalam Banda Aceh Indonesia Chemical Engineering Graduate Study Program Faculty of Engineering Syiah Kuala University Darussalam Banda Aceh Indonesia

In this study, solid-state fermentation was carried out to produce single cell protein by local Aspergillus niger. Rice straw pulp produced from the pretreatment by liquid hot water at temperature 121 °C for 60 minutes of cooking time was used as carbon source. The effects of nitrogen sources, initial medium pH, C/N ratios of substrates and fermentation time on SCP production were evaluated in these experiments. The single cell protein was measured as crude protein content in the fermentation product by the Kjeldahl analysis method. The maximum crude protein of 18.9 % (w/w) contained in the fermentation product occurred at the fermentation condition with C/N ratio 30:1, the initial medium pH 4, temperature 30 °C, moisture content 75 % and relative humidity 95 %. © Published under licence by IOP Publishing Ltd.

关键词： Carbon

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Power Transfer Analysis Using UPQC-PV System Under Sag and Interruption With Variable Irradiance

Power Transfer Analysis Using UPQC-PV System Under Sag and I...

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Smart Technology and Applications (ICoSTA), 2020 International Conference on

作者： Amirullah Adi Soeprijanto Adiananda Ontoseno Penangsang Electrical Engineering Study Program Faculty of Engineering Universitas Bhayangkara Surabaya Surabaya Indonesia Department of Electrical Engineering Institut Teknologi Sepuluh Nopember Surabaya Indonesia

ISBN: (数字)9781728130835

ISBN: (纸本)9781728130842

This paper presents an analysis of the Unified Power Quality Conditioner-Photovoltaic (UPQC-PV) system under sag and interruption voltage with variable irradiance. The PV is connected to a three-phase three-wire (3P3W) distribution system with 380 volts (L-L) and a frequency of 50 hertz, through UPQC-DC link. This system is used to maintain and supply sensitive loads. This paper shows that in the sag voltage and irradiance levels of 200 W/m 2 to 1200 W/m 2 , the 3P3W system uses UPQC-PV with proportional-integral (PI) still able to maintain the active load power above 3714 W. However, in the interruption voltage and same irradiance level, the load active power drops to between 2560 W and 2805 W. This research also shows that in the sag voltage and same irradiance levels, the 3P3W system uses UPQC-PV with PI still able to generate PV power between 500 W to 920 W. In the interruption voltage and same irradiance levels, the power that can be generated by PV increases between 1300 W to 1635 W. Otherwise, at 25 0 C and 1000 W/m 2 , the increase in PV power on interruption voltage has not been able to meet the load active power consumption, so it finally drops to 2650 W. This paper is simulated using Matlab/Simulink.

关键词： UPQC Photovoltaic Sag Interruption Irradiance interruption irradiance interrupters PHOTOVOLTAIC Tungsten Light intensity Polydnaviridae VOLTAGE

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Comparison design of electric motorcycles using hybrid systems (BLDC motor) on 150Cc motorcycles based on parameter testing

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AIP Conference Proceedings 2023年第1期2592卷

作者： Pawenary S. Azzahra Hastuti Azis H. Andre A. S. Prabuwono Electrical Technology Study Program Faculty of Electricity and Renewable Energy PLN Institute of Technology Jakarta Indonesia Department of Electrical Engineering Faculty of Engineering Universitas Andalas Padang Indonesia Rabigh Faculty of Computer and Information Technology (FCITR) King Abdulaziz University Jeddah Saudi Arabiaa

This study aims to know the comparison design of electric motorcycle using hybrid systems (BLDC Motor) based on parameter testing, i.e., with and without load. The design of electric motorcycles is centered on determining a feasibility study comparing engine drive with electric drive. Electric vehicles are the answer to decreasing petroleum supplies and environmental concerns that are worsening every year due to oil-fueled cars’ exhaust emissions. The proportion of motor vehicle exhaust as an air pollution source is between 60 and 70 percent. The global decrease of fossil fuels is also a critical issue that has yet to be handled. A descriptive statistic methodology was employed in this work as an analytical tool. The results showed when the speed increases, the efficiency of the BLDC motor would increase; this is, of course, following the principle of Orsted’s law and Lorentz force. When compared to the no-load test, the efficiency by using the load will be greater because when the BLDC motor works with a load, it will require greater torque due to an increase in load so that it takes a large amount of power so that it will increase the efficiency of the BLDC motor. When compared in terms of using the battery, the time of using the battery with no load will be longer because it does not require too much current.

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The Design of Automatic Sprinkler based on Arduino Uno Microcontroller 3

The Design of Automatic Sprinkler based on Arduino Uno Micro...

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3rd International Symposium on Agricultural and Biosystem engineering, ISABE 2019

作者： Priyati, A. Sahbandi, M. Putra, G.M.D. Setiawati, D.A. Study Program of Agricultural Engineering Faculty of Food and Agroindustrial Technology Universitas Mataram NTB Mataram Indonesia

The purpose of this study was to design a microcontroller based automatic plant watering system. The method used was an experimental method using two sensors, i.e. soil moisture sensor (measure soil moisture) and ultrasonic sensors (measure the distance of rotary direction regulator for DC motors). Arduino board is preferable as the main controller due to its simplicity. Tool testing was conducted through trials on soil samples and performance tests when the tool was operating. The parameters observed were solar intensity (Lux), ambient temperature (°C), RH (%), water discharge (ml/s), DC motor axis rotation (rpm), AC and DC voltage (Volt), and soil moisture (%). The tool testing showed that the designed watering system could works properly with less than 10% MAPE. When the sensor read the soil moisture value below 70% setting point, the pump and DC motor were turned on. Whereas, when the soil moisture value achieved 80% setting point, the pump and DC motor were turned off. Performance test was conducted for three days of observation. The founding shows that the designed automatic watering system could successfully provide as much as 2.52 litre of water during approximately 6 minutes of watering period. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： DC motors

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Analysis of extreme weather used C-band radar and rain gauge for floods and landslides in Lombok

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AIP Conference Proceedings 2023年第1期2609卷

作者： Made Sutha Yadnya Yudist I. Wayan Sudiarta 1Electrical Engineering Communication Laboratory Engineering Faculty University of Mataram Mataram Indonesia 2BMKG Lombok Mataram Indonesia 3Physic Study Program Faculty of Mathematics and Natural Science University of Mataram Mataram Indonesia

This paper is collaboration between BMKG and the University of Mataram to mitigate landslides by utilizing C-band radar data and rain gauges in measuring rainfall as the main factor triggering disasters. In heavy and prolonged rains, there is a chance for disasters to occur. Based on the observations of the Lombok International Airport Meteorological Station (-8°76'59"LS and 116°27’'91"E), the 24-hour cumulative rain on January 30, 2021, the analysis results of 64 mm/h can be included in the category of extrime rainfall.

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Canopy cover estimation based on support vector regression derived from Lidar & Landsat 8 OLI 40

Canopy cover estimation based on support vector regression d...

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40th Asian Conference on Remote Sensing: Progress of Remote Sensing Technology for Smart Future, ACRS 2019

作者： Hudjimartsu, Sahid Tampinongkol, Felliks Rudianto, Yoga Setiawan, Yudi Prasetyo, Lilik Budi Forests2020 Programme Environmental Analysis and Spatial Modelling Laboratory Department of Forest Resource Conservation Faculty of Forestry Bogor Agricultural University Bogor West Java Indonesia Geoinformatic of Informatics Engineering Study Program Faculty of Engineering and Science Ibn Khaldun University Jalan KH Soleh Iskandar KM 2 Tanah Sereal Bogor West Jawa Indonesia

Light detection and ranging (LiDAR) provides geospatial information with massive amounts of data to use in a variety of applications. Canopy cover percentage of tree crown is one application that is estimated through LiDAR data. This study aims to estimate a canopy cover derived from LiDAR used as reference data with multispectral Landsat 8 OLI. Statistical or machine learning approaches can be used to estimate a canopy cover. In statistical inference, the form of distribution chosen by the analyst and parameter is estimated from the data. This will be a problem in the construction function for the National scale, due to many ecosystems and then will have many functions for each ecosystem. Machine learning (ML) methods, in contrast, are various kinds of algorithms that are used to learn the mapping function or classification rules inductively, directly from the training data. ML can solve problems related to big data and global method and it will be used as a methodical approach to estimate canopy cover on the National scale. In this study, we use a support vector regression (SVR) as ML method to estimate the canopy cover. The estimated percentage of canopy cover will be used as one of the parameters to classify a forest. © 2020 40th Asian Conference on Remote Sensing, ACRS 2019: "Progress of Remote Sensing Technology for Smart Future". All rights reserved.

关键词： Ecosystems

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Digital filter effect of the ventilator tester parameters to identify inflation phases

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AIP Conference Proceedings 2022年第1期2537卷

作者： Tomy Abuzairi Ahli Irfan Basari 1Electrical Engineering Study Program Department of Electrical Engineering Faculty of Engineering Universitas Indonesia Kampus UI Depok West Java 16424 Indonesia 3Research Center for Biomedical Engineering Faculty of Engineering Universitas Indonesia Kampus UI Depok West Java 16424 Indonesia 2Biomedical Engineering Study Program Department of Electrical Engineering Faculty of Engineering Universitas Indonesia Kampus UI Depok West Java 16424 Indonesia

A ventilator is a breathing support device that serves as a therapeutic tool or treatment tool for patients with respiratory system failure caused by various health problems or diseases. On ventilators, there are crucial parameters that need to be monitored in advance, such as inspiration–expiration (I:E) ratio, respiration rate, tidal volume, peak inspiration pressure (PIP), positive end-expiratory pressure (PEEP), and oxygen concentration. To monitor those parameters, a ventilator tester is needed. In this paper, we analyzed the effect of a digital filter in the ventilator tester, COVENT-Tester, to identify the inflation phase in the ventilator parameters. The results show that the digital filter is not effective in measuring I:E ratio and respiration rate because of the delay in inspiration and expiration time. However, the digital filter is effective in measuring tidal volume, PIP, PEEP, and oxygen concentration.

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Distribution mapping of Open Defecation (OD) houses in East Surabaya based on Geographic Information System (GIS) 1

Distribution mapping of Open Defecation (OD) houses in East ...

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

作者： Purnama, M.Y. Soedarti, T. Oktavitri, N.I. Fitriani, N. Study Program of Environmental Engineering Department of Biology Faculty of Science and Technology Universitas Airlangga Surabaya Indonesia

The purpose of this study is to know and locate the distribution of open defecation houses in East Surabaya of Surabaya City, Indonesia. Both of secondary and primary data are required for this research, the secondary data consist of the number of OD houses in East Surabaya and basic map of Surabaya City. Primary data consist of field survey OD houses of legal and illegal status. Mapping is conducted with mapping software based on geographical information system. The result of this research proves that there are 1.083 OD houses in East Surabaya and it is equally distributed throughout East Surabaya. The most OD sub-district (Kelurahan) is Gubeng with approximately 319 houses while the least is Kelurahan Tambaksari with 23 houses. © 2019 IOP Publishing Ltd.

关键词： Houses

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Unlocking gold recovery: Optimizing leaching process from tailing sluice boxes with HCl pretreatment and cyanide concentration variations

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AIP Conference Proceedings 2024年第1期3167卷

作者： Tri Wahyuningsih Dyah Probowati Yasmina Amalia Ari Mulyadi Chandra Yoga Prathama Metallurgical Engineering Study Program Department of Mining Engineering Faculty of Mineral Technology UPN "Veteran" Yogyakarta Sleman Yogyakarta Indonesia PT. Global Mineralium Corporindo Jl. Kalasan Cangkringan KM 05 Duri Tirtomartani Kalasan Sleman Yogyakarta Indonesia

Tailing sluice box still contains 4.96 gpt of gold. Samples were taken for XRD and SEM-EDX testing. The XRD test results show that quartz is the dominant mineral, followed by clay and feldspar. Quartz mineral content is 46.87%, clay mineral content is 17.76% and feldspar mineral content is 27.80%. The clay mineral content which tends to be high affects the leaching process which makes the reaction take longer. The results of the diagnostic leach test using HCl solution and cyanide solution resulted in 39% Au gain. The results of the HCl pretreatment on the tailings grain size -150, -200, and -270 mesh got Au gain percentage of 23.6%, 29.6%, 44%. Tailings leaching with variations in cyanide concentrations of 500 ppm, 750 ppm and 1000 ppm resulted in gold recovery of 0.8%, 5.8%, and 7.8%. The highest gold gain was at - 270mesh size and 1000ppm cyanide concentration with 72 hours leaching time.

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Synthesis activated carbon from shell of Elaeis guineensis Jacq and modified with magnetite (AC-Fe3O4) as adsorbent for waste metal ion Pb(II) in waters

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AIP Conference Proceedings 2024年第1期2970卷

作者： A. S. Zulaicha Buhani A. R. Nuralita A. Setiajaya Cosmetic Engineering Study Program Faculty of Sciences Sumatera Institute of Technology Jl. Terusan Ryacudu Way Huwi Jati Agung South Lampung 35365 Indonesia Department of Chemistry Faculty of Mathematics and Natural Sciences University of Lampung Jl. Sumantri Brojonegoro No 1 Bandar Lampung Lampung 34154 Indonesia Environmental Engineering Study Program Faculty of Sciences Sumatera Institute of Technology Jl. Terusan Ryacudu Way Huwi Jati Agung South Lampung 35365 Indonesia

In this study, the manufacture of palm shell activated carbon was obtained from PT Inti Sentosa Alam Bahtera (ISAB) Lampung. The content of cellulose is quite large, namely 45% and hemicellulose 26%, which causes this oil palm shell to be used as a basic material for making activated carbon. This study proposes to modify activated carbon using magnetite (AC-Fe3O4). Modified physical-chemical activated carbon is exhausted as an adsorbent which has the advantage of facilitating the filtration or separation process with the adsorbate. The adsorbent test used an adsorbate in the form of heavy metal ions Pb(II). The XRD characterization of AC-Fe3O4 has intensity peaks at 2θ at 30, 35, 43, and 56° which are consistent with the XRD pattern of magnetite. SEM-EDX characterization was also carried out to see differences in morphology and elemental composition between unmodified activated carbon and AC-Fe3O4. Then the external range analysis was carried out using the BET (surface area) method. As well as identification of the amount of metal ions Pb(II) adsorbed using Atomic Absorption Spectrophotometry (AAS). The test results on the adsorbent (AC-Fe3O4) were carried out at the optimum variation, namely the adsorbent dose of 0.1 grams, contact time of 120 minutes, and at a dilution of 300 mg/L. Based on the zeta potential, the pH of PZC was obtained, namely 6 as the pH of the adsorbate solution with a Q value (number of Pb(II) ions adsorbed) of 6.175 mg/g. Adsorption isotherms tend to follow the pattern of Freundlich adsorption isotherms.

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