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SSRN 2023年

作者： Chang, Yu-Chi Chou, Feng-Chih Huang, Sz-Ping Chen, Ku-Fan Lin, Yuan-Chung Institute of Environmental Engineering National Sun Yat-Sen University Kaohsiung804 Taiwan Center for Emerging Contaminants Research National Sun Yat-Sen University Kaohsiung804 Taiwan Department of Civil Engineering National Chi Nan University Puli Nantou545 Taiwan Department of Public Health College of Health Science Kaohsiung Medical University Kaohsiung City807 Taiwan Doctoral Degree Program in Toxicology College of Pharmacy Kaohsiung Medical University Kaohsiung807 Taiwan

ormaldehyde (HCHO) is a significant volatile organic compound (VOC) commonly found in indoor air, leading to serious health implications upon exposure. This study investigates the photocatalytic degradation of formaldehyde using Zn or Sn-doped TiO2 as the photocatalyst. Microwave system is used not only for synthesizing aluminum slag and glass but for doping Sn and Zn into zeolite. The results showed that P25-TiO2 nanoparticles annealed at 400°C exhibited a higher intensity of anatase peaks, while TiO2 doped with 0.5 mol% Zn and Sn and annealed at 400°C showed stronger anatase peaks in the XRD patterns. SEM images displayed a surface morphology with fine flakes and flower-like structures after annealing at 400°C for Zn and Sn-doped TiO2, respectively. Photoluminescence analysis indicated that 0.5 mol% Zn-doped TiO2 exhibited a greater red shift and lower intensity. Among the various samples, TiO2 doped with 0.5 mol% Zn demonstrated the optimal photocatalytic efficiency for formaldehyde degradation, achieving the highest degradation efficiency of 75% within 40 minutes. 0.5 mol% Zn-doped TiO2 can effectively enhance the photocatalytic performance and degradation efficiency of formaldehyde due to reducing recombination centers. The hydroxycancrinite mixed TiO2 doped with 0.5 mol% Zn exhibited an increased specific surface area of 95.5 m2 g−1. Under visible light, formaldehyde degradation reached saturation within 20 minutes, resulting in an efficiency of 20.1%. Both photodegradation and adsorption was used for formaldehyde degradation. The study provides the development of efficient materials for indoor air treatment and pollutant degradation. © 2023, The Authors. All rights reserved.

关键词： Titanium dioxide

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A unique diffraction pattern formed by a grating from a flying termite wing

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Physics Education 2022年第5期57卷 055026页

作者： Aji, Mahardika Prasetya Wulandari, Yuvita Kiki Setiawan, Rudi Karunawan, Jotti Priyanto, Aan Department of Physics Universitas Negeri Semarang Jalan Raya Sekaran Central Java Semarang Indonesia Radiodiagnostic and Radiotherapy Engineering Study Program Institute of Health Science An Nasher Cirebon West Java Indonesia Doctoral Program of Nanoscience and Nanotechnology Institut Teknologi Bandung Jalan Ganesha No. 10 West Java Bandung Indonesia Department of Physics Institut Teknologi Bandung Jalan Ganesha No. 10 Bandung West Java Indonesia

In diffraction experiments, natural gratings often create uncommon diffraction patterns compared with those resulting from manufactured gratings. This study analyzed a unique diffraction pattern obtained by a grating from a flying termite wing. A ring-like diffraction pattern was formed because of the grating morphology from a flying termite wing, which consisted of horizontal- and vertical-structured slits. The mechanism of diffraction pattern formation is also provided. The distance between slits was measured using digital microscope images and a diffraction experiment, with the results coming to an agreement. Using this grating in a diffraction experiment can help educators provide an alternative diffraction experiment that supports students in studying the topic in a more complex manner. © 2022 IOP Publishing Ltd.

关键词： diffraction pattern flying termite wing grating

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Integration of Solar Energy Supply on the Smart Home Micro Grid to Support Efficient Electricity and Green Environment

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IOP Conference Series: Earth and Environmental science 2019年第1期239卷

作者： Purwanto Hermawan Suherman Doctoral Program of Environmental Science School of Postgraduates Studies Diponegoro University Indonesia Department of Chemical Engineering Faculty of Engineering Diponegoro University Indonesia Department of Electrical Engineering Faculty of Engineering Diponegoro University Indonesia

The development and utilization of renewable energy sources usually requires a complicated process and often still needs the support from fossil energy sources, so that a system that integrate both energy sources must be developed. Smart grid is a modern electricity network infrastructure with the ability to integrate alternative (nuclear, geothermal) and renewable energy sources (wind, water, air, diesel, etc.) and the ability to improve reliability, efficiency and security through automatic control and use of modern communication technology. Therefore the Smart Grid implementation will provide greater benefits because the number of renewable and integrated and integrated storage units increases, efficiency increases, operational costs decrease, reliability increases and CO2 emissions decrease. The implementation of the smart grid in the micro scale in this study is for the fulfilment of household electricity needs. The solar power as a renewable energy sources will be integrated to the smart grids so that households can become independent in providing electricity and not dependent on the state electricity company and also reduce monthly electricity costs. This study will discuss the integrating energy supply on the smart home micro grid.

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Spatial analysis: Mapping potential land for sustainable urban forests using Landsat-TM satellite data imagery in East Jakarta

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IOP Conference Series: Earth and Environmental science 2018年第1期202卷

作者： D M Sundara D M Hartono E Suganda H Haeruman Doctoral Student at Environmental Science Program Universitas Indonesia Jl. Salemba Raya no.4 Jakarta-10430 Indonesia Faculty of Engineering Universitas Indonesia Depok West Java 16424 Indonesia Environmental Science Program

This paper discusses the development of urban forest areas in eastern Jakarta to encourage sustainable urban development and socio-economic environment balance. This research aims to calculate the urban forest area needs in sub-district of Makasar, Ciracas and Cakung sub-districts, East Jakarta. The method used is to calculate index of urban forest area requirement (Indeks Luas Hutan Kota / ILHK) with Marshal Edgewarth method approach. The potential land mapping using Landsat-TM satellite image data is further processed through spatial allasis using Geographic Information System (GIS). The results of this research indicate the existence of sufficient land potential and can function ecologically as urban forests, and able to be a driver for sustainable urban development.

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Design of eco-friendly fixed bed dryer based on a combination of solar collector and photovoltaic module

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Nature Environment and Pollution Technology 2019年第1期18卷 21-30页

作者： Mardiyani, Siti Asmaniyah Sumarlan, Sumardi Hadi Argo, Bambang Dwi Leksono, Amin Setyo Doctoral Program of Environmental Studies Brawijaya University Jl. Veteran Malang6514 Indonesia Department of Agrotechnology Faculty of Agriculture University of Islam Malang Jl. MT. Haryono 193 Malang65144 Indonesia Department of Agricultural Engineering Faculty of Agricultural Technology Brawijaya University Jl. Veteran Malang65145 Indonesia Department of Biology Faculty of Mathematic and Natural Science Brawijaya University Jl. Veteran Malang65145 Indonesia

A study to develop a convective eco-friendly fixed-bed solar dryer is presented in this article. The aim of this study was to design an efficient eco-friendly fixed bed dryer using solar collector and solar photovoltaic panel with a forced convective system. The design consists of a V-corrugated solar collector, a centrifugal fan, a solar photovoltaic module (100 WP) and a drying unit in the mini-silo model with five layers. The dryer performance test was conducted in September, October, and November 2017 in Malang, East Java, Indonesia. The observation showed that the temperature of the solar collector and the first layer of the drying unit could reach 40-70°C on a sunny day and 30-50°C in cloudy/rainy conditions. The efficiency of the daily collector varied from 20% to 50%. Based on a multiple regression analysis, it showed that some variables (solar intensity, voltage of photovoltaic panel, air speed around the blower, air collector velocity, collector relative humidity, ambient temperature and relative humidity temperature) significantly influenced the collector temperature. The result of drying simulation using red pepper showed that the design has a potential to be used as an eco-friendly fixed bed convective drying. Based on the empirical model, the drying time needed to reach 12% of moisture content (wet basis), respectively, was 5-6 days for the first tray, 8-9 days for the second tray and 9-10 days for the third tray in rainy season. © 2019 Technoscience Publications. All Rights Reserved.

关键词： Air

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The effect of fiber volume fraction on tensile and impact properties of eleusine indica grass reinforced polypropylene bio composite

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IOP Conference Series: Materials science and engineering 2019年第1期539卷

作者： I P Lokantara N P G Suardana I W Surata I N S Winaya Doctoral Study Program of Engineering Science Faculty of Engineering Udayana University Kampus Sudirman Denpasar-Bali Indonesia Mechanical Engineering Department of Udayana University Street of Bukit Jimbaran Badung Bali Indonesia

The purpose of this research was to investigate the tensile strength and impact strength of eleusine indica grass fiber-reinforced polypropylene recycle composite. In this study, the fiber was treated with alkali at 5% NaOH for 2 hours. The eleusine indica grass fiber cut with a length of 3 cm and the matrix used recycle polypropylene. In this research, the volume fraction of eleusine indica grass fiber varied by 20%, 25%, and 30% respectively. The composite molded with a hot press at temperature 200°C with a holding time for 2 hours. Tensile test used ASTM D3039 and impact test used ASTM D256. The highest tensile and impact strength results on fiber volume fraction 30%.

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Water quality indices for rainwater quality assessment in Bandung urban region

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IOP Conference Series: Materials science and engineering 2019年第1期669卷

作者： N Y Hasan Driejana A Sulaeman H D Ariesyady Doctoral Program of Environmental Engineering Faculty of Civil and Environmental Engineering Bandung Institute of Technology Faculty of Civil and Environmental Engineering Bandung Institute of Technology Faculty of Mathematics and Natural Science Bandung Institute of Technology

Water quality indices (WQI) using STORET method has been used to assess rainwater quality in the Bandung urban regions, based on monitoring data at three locations (Coblong, Sumur Bandung, and Buah Batu). Rainwater samples were analyzed by detecting pH, SO4 2-, NO3 −, Cl−, and heavy metals (As, Cd, Cr, Pb, and Zn) compared with Indonesian Government Regulation No. 82 Year 2001. Rainwater quality showed polluted based on the parameters of the water quality indices analysis using the Class I and Class II criteria. Rainwater quality in Bandung urban region were lightly polluted (Coblong) and moderately polluted (Sumur Bandung and Buah Batu). Rainwater can potentially become a water sources alternative for domestic use and urban farming in Bandung urban region, but it requires further treatment for better quality.

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Photobiomodulation Effect of Infra-Red Laser on the Level of Gonad Maturity in the Simese Catfish (Pangasianodon Hypophthalmus)

SSRN

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SSRN 2022年

作者： Astuti, Suryani Dyah Febriastri, Amalia Rizky Mukti, Ahmad Taufiq Yaqubi, Ahmad Khalil Susilo, Yunus Department of Physics Faculty of Sciences and Technology Airlangga University Surabaya60115 Indonesia Faculty of Sciences and Technology Airlangga University Surabaya60115 Indonesia Department of Fish Health and Aquaculture Management Faculty of Fisheries and Marine Affairs Airlangga Universit Surabaya60115 Indonesia Doctoral Program Faculty of Science and Technology Airlangga University Surabaya60115 Indonesia Faculty of Engineering Dr Soetomo University Surabaya60118 Indonesia

This research’s goal is to establish the impact of photo biomodulation therapy using infrared diode laser irradiation (975.2 nm) on male Siamese catfish’s gonadal maturity level (Pan- gasianodon hypophthalmus). Infrared diode laser irradiation is used at the reproductive point (governor vessel), which is located 2/3 of the distance between the anus and the pectoral fin. TKG, gonado somatic index and hepatic somatic index were the parameters studied in this study. The treatments were as follows: Control- (no treatment), Control+ (ova prim), P1 (0.2 J/cm2), P2 (0.4 J/cm2), P3 (0.6 J/cm2), and P4 (0.8 J/cm2). Photo biomodulation therapy with infrared diode laser exposure can affect the level of gonad maturity (TKG), gonado somatic index, and hepatic somatic index in male Siamese catfish, according to the results of the tests (Pangasianodon hypopthalmus). The fish gonads at the TKG IV stage had the highest TKG at P2 (dose 0.4 J/cm2), with a GSI value of 1.02 percent and an HSI value of 1.46 percent. According to the findings of the study, photo biomodulation therapy with infrared diode laser exposure at a dose of 0.4 J/cm2 is the best way to increase the gonad maturity of male Siamese catfish (Pangasianodon hypophthalmus). © 2022, The Authors. All rights reserved.

关键词： Irradiation

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Review on cold-formed steel beam-column, apex and eaves, and truss joint

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AIP Conference Proceedings 2024年第1期3116卷

作者： R. M. Fadel Satria Albimanzura Anis Saggaff Mahmood Md Tahir Kiagus Muhammad Aminuddin Doctoral Student of Engineering Science Study Program Doctoral Faculty of Engineering Sriwijaya University Indralaya Indonesia Civil Engineering Faculty of Engineering Sriwijaya University Indralaya Indonesia Institute for Smart Infrastructure and Innovative Construction (ISIIC) Construction Research Centre (CRC) School of Civil Engineering University Teknologi Malaysia Johor Bahru Malaysia

Light steel framing using the Cold-Formed Steel (CFS) sections is one of the Industrialized Building Systems (IBS) highly recommended for our construction industry; it not only contributes to speeding up construction time and reducing material usage but also guarantees the quality of the building. A relentless study has been conducted to achieve the appropriate configuration to ensure CFS popularity by introducing different types of joints applicable in constructing lightweight steel framing. A review of the CFS joint is provided in this study. The CFS joint is focused on the beam-column joint, apex and eaves, and truss joint. The study is mapped to establish research trends on CFS joints. Some areas show limited study and need future research on the proposed joints’ structural behavior aspects.

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Working ratio estimation method for a long distance fixed wireless access (22 GHz band, 6.3 Mbit/s) link

Working ratio estimation method for a long distance fixed wi...

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IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： Y. Ohmiya K. Katagishi A. Vasilache T. Asami H. Murakami K. Toraichi Doctoral Program Graduate School of Systems and Information Engineering University of Tsukuba Tsukuba-shi Ibaraki Japan Institute of Information Sciences and Electronics University of Tsukuba Tsukuba-shi Ibaraki Japan Japan Science and Technology Corporation University of Tsukuba TARA Center Ibaraki Japan KDDI R&D Laboratories Inc. Kamifukuoka-shi Saitama Japan KDDI Corporation KDDI bldg. Shinjuku-ku Tokyo Japan

This paper discusses a method to determine the optimal node location before a long distance FWA network (22 GHz band, 6.3 Mbit/s) is set. During our 3 years experiment, we found out that the long distance FWA net with 2 links (about 60 km) was down for approximately 42 hours per year due to heavy rain fall conditions. This means that the long distance FWA net is practicable to some extent. We discuss a method to estimate the working ratio between two unknown locations using AMeDAS weather data. By using this method, an appropriate node location can be decided before FWA net is deployed. This approach can improve the working ratio in the sense of link-up continuation.

关键词： Rain Space technology Costs Systems engineering and theory Research and development Laboratories Telegraphy Delay Interference Space stations

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