检索结果-内蒙古大学图书馆

SSRN 2024年

作者： Djaenudin Putra, Herlian Eriska Muchlis Wresta, Arini Indriati, Lies Sintawardani, Neni Fitria, Novi Hamidah, Umi Purwanta, Wahyu Permana, Dani Setiawan, Arief Ameir Rahman Putri, Ganiz Amaranthi Nilawati, Dewi Widyarani KST Dr. Samaun Samadikun Jalan Sangkuriang No. 21 D Bandung40135 Indonesia Collaborative Research Center for Zero Waste and Sustainability Jl. Kalijudan No. 37 Surabaya60114 Indonesia Department of Chemistry Sekolah Tinggi Analis Bakti Asih Bandung40192 Indonesia Jalan Raya Jakarta-Bogor KM. 46 Cibinong Bogor16911 Indonesia Selatan Tangerang15314 Indonesia Environmental Engineering Study Program Faculty of Civil Engineering and Planning Institut Teknologi Nasional Jalan P. H. H. Mustofa No. 23 Bandung40124 Indonesia

Disposable diapers have become an overwhelming component of municipal waste streams, exemplified by Bandung's staggering daily influx of approximately 1,451,024 diapers into landfills in 2021. Hydrothermal carbonization (HTC) emerges as a potential solution for the valorization of this problematic waste, transforming it into hydrochar, a key ingredient for environmentally-conscious briquettes. However, HTC's reliance on substantial water resources underscores the urgent need for efficiency strategies. This study investigates water recirculation as a strategy to promote resource conservation within HTC while processing disposable diapers. Key process parameters—temperature (200–250 °C), residence time (15–45 minutes), and single-pass recirculation—were systematically varied to assess their impact on hydrochar characteristics. Results demonstrate that higher temperatures, longer residence times, and recirculation can enhance hydrochar heating value and energy densification ratio, albeit with yield and energy yield trade-offs. The highest values for yield (20.88%), calorific value (8,247.57 cal/g), energy densification ratio (1.359), and energy yield (25.08%) were obtained under specific conditions. © 2024, The Authors. All rights reserved.

关键词： Water conservation

来源：评论

学校读者我要写书评

暂无评论

X-ray application of micro-computed tomography for biological sample test

引用

AIP Conference Proceedings 2023年第1期2614卷

作者： Susilo Yuni Wijayanti Fitria Azmi Rudi Setiawan Ulil Albab Taufiq Ian Yulianti Physics Department Faculty of Mathematics and Natural Sciences Universitas Negeri Semarang Semarang Indonesia Public Health Study Program Universitas Negeri Semarang Semarang Indonesia Radiodiagnostic Engineering and Radiotherapy Study Program STIKES An Nasher Cirebon Indonesia Faculty of Science and Mathematics Universitas Diponegoro Semarang Indonesia

Homemade micro-CT equipment has been successfully developed in the Physics Laboratory of Universitas Negeri Semarang (UNNES). The micro-CT was tested and could be used properly for non-destructive testing (NDT) using a phantom as the object. However, the application of the micro-CT for biological samples has not been investigated. Therefore, in this work, an investigation of the homemade micro-CT for biological samples was done. Tilapia fish was used an object. The fish was exposed to the X-ray using exposure factors of 45 kV, 32 mA, and 0.08 s. The object was rotated with rotation angle range of 0°-360° with increment of 1.40625° and the images at every rotation angle increment was recorded. The three-dimensional (3D) image was then reconstructed from the collection of the two-dimensional (2D) images obtained during rotation. The quality of the images was then analyzed using contrast to noise ratio method (CNR). The results showed that the highest CNR was obtained at the image taken with rotation angle of 315° which was 81.163. Therefore, it can be concluded that the homemade micro-CT equipment could be used for biological sample and can be further applied in other applications such as CT-scan.

关键词：

来源：评论

学校读者我要写书评

暂无评论

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

引用

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

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...

引用

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

来源：评论

学校读者我要写书评

暂无评论

The Design of Automatic Sprinkler based on Arduino Uno Microcontroller 3

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

引用

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

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

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

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 ...

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

引用

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Production and decolorization of lignin from industrial waste of pulp and paper based on the coagulation method using poly aluminium chloride

引用

AIP Conference Proceedings 2022年第1期2578卷

作者： Calaelma Logys Imalia Bambang Pramudono Slamet Priyanto Rosemerry Fatmawati Maureen Yudith Tiurma 1Master Degree Program in Chemical Engineering Faculty of Engineering Diponegoro University Semarang Central Java 50275 Indonesia 2Department of Chemical Engineering Faculty of Engineering Diponegoro University Semarang Central Java 50275 Indonesia

Pulp and paper industrial waste or what is known as black liquor contains toxic contents, if not treated first, it can cause environmental pollution. So far, black liquor has only been used for the manufacture of biofuels and fuel for the paper industry, while 46% of lignin is the total solids in the black liquor component itself. This study aims to determine how much the percentage of decolorization of black liquor and producing lignin with bright colors using the coagulation method. The coagulant used in this study was Poly Aluminium Chloride (PAC) with various concentrations (0.5%, 1%, 1.5%, 2%, and 2.5%) v / v. The results showed that the coagulation method proved effective in decolorizing lignin made from black liquor as raw material. The optimum condition to obtain decolorization was 90.44% using 2% PAC coagulant concentration and the total retention time of 24 hours. In addition, FTIR was used to qualitatively analyze the sludge produced during the coagulation process, and the results showed that there are several different groups in the lignin unit. The lignin obtained using the coagulation method produces a brighter brown color, is insoluble in water and odorless with a yield of 38.3%, a pH of 1.68, a purity of 54.8%, and water content and an ash content of 0.2% and 27.2%, respectively.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：