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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)

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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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Detection of features from the internet of things customer attitudes in the hotel industry using a deep neural network model

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Measurement: Sensors 2022年 22卷

作者： Rajesh, Sudha Abd Algani, Yousef Methkal Al Ansari, Mohammed Saleh Balachander, Bhuvaneswari Raj, Roop Muda, Iskandar Kiran Bala, B. Balaji, S. Dept. of Computational Intelligence College of Engineering and Technology School of Computing SRMIST Kattankulathur Chennai India Department of Mathematics Sakhnin College Israel College of Engineering Department of Chemical Engineering University of Bahrain Bahrain Department of ECE Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Chennai602105 India Lecturer in Economics Education Department Government of Haryana Haryana Panchkula India Department of Doctoral Program Faculty Economic and Business Universitas Sumatera Utara 20222 Jl. Prof TM Hanafiah 12 USU Campus Padang bulan Medan20155 Indonesia Department of Artificial Intelligence and Data Science K.Ramakrishnan College of Engineering Tamil Nadu Trichy India Department of CSE Panimalar Engineering College Chennai India Department of Mathematics The Arab Academic College for Education in Israel-Haifa Israel

Tourism and the hotel business have benefited greatly from the use of digital social networking. Using social big data research, the application of deep learning seems to have been beneficial in a marketing strategies and customer preference estimate. Recognizing human psychology, which is critical to industrial success, has benefited greatly from digital technology and social media. The Internet of Things (IoT) provides a chance for a hotel sector to improve the customer experience although lowering operational expenses. The ratings are determined by the following factors: Value, Apartment, Location, Hygiene, Front Office, Facilities, Professional Service, Internet, and Parking. Traditional techniques which anticipate hotel evaluations through minimal precision add difficulty to the rating assessment. As a result, efficient deep learning algorithms are employed to evaluate reviews designed to help consumers in selecting better hotels. To predict qualities, multiple classification techniques, including convolutional neural network-based deep learning (CNN-DL) and support vector machine (SVM) network-based deep learning, were used in this research. The system examines system efficiency by using the TripAdvisor website, this is a well American database. The research results reveal that the CNN-DL method outperforms another method in terms of classification efficiency and failure *** graphical results could also be utilized to enhance the effectiveness of the suggested model and offer insights into response tactics, demonstrating the study's academic and conceptual achievements. Although it is feasible to conclude from such research that the possibility of IoT within the hotel industry has not yet been fully investigated, as researchers commonly speculate on using IoT for implementations that might quickly be of involvement to a hotel sector, but refuse to recognize that possibility as a massive market. © 2022 The Author(s)

关键词： Hotels

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Assessment and optimization of As(V) adsorption on hydrogel composite integrating chitosan-polyvinyl alcohol and Fe3O4 nanoparticles and evaluation of their regeneration and reusable capabilities in aqueous media

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science of the Total Environment 2023年 855卷 158877页

作者： Weerasundara, Lakshika Ok, Yong Sik Kumarathilaka, Prasanna Marchuk, Alla Bundschuh, Jochen School of Civil Engineering and Surveying Faculty of Health Engineering and Sciences University of Southern Queensland West Street ToowoombaQLD4350 Australia Korea Biochar Research Centre & Division of Environmental Sciences and Ecological Engineering Korea University Seoul Korea Republic of Institute for Life Sciences and the Environment University of Southern Queensland West Street ToowoombaQLD4350 Australia Doctoral Program in Science Technology Environment and Mathematics Department of Earth and Environmental Sciences National Chung Cheng University 168 University Rd. Min-Hsiung Chiayi County62102 Taiwan

A modified chitosan-polyvinyl alcohol (PVA) hydrogel was developed by incorporating Fe3O4 nanoparticles. Four chitosan-Fe3O4 (ChFe) hydrogel types were developed based on chitosan:Fe3O4 ratio as 1:0, 1:1, 1:0.5 and 1:0.25. Batch sorption experiments were conducted with different pH, dosage, kinetics, and isotherms. The exhausted ChFe hydrogels were evaluated for their regeneration and reuse capability with different acids and bases. The best hydrogel for arsenic (V) [As(V)] adsorption was 1:0.5 ratio ChFe hydrogel. The highest As(V) adsorption (89 %) was at pH 4 and the adsorption capacity gradually decreased with increasing solution pH. Within the pH 4–6 range, the hydrogel surface became positively charged due to protonation of –NH2 and –OH groups in the polymer chain and the positive surface attracted H2AsO4− and HAsO42− oxyanions. The experimental kinetic data was well-fitted to the Elovich model (R2 of 0.99) while the Freundlich isotherm model best described the isotherm data (R2 of 0.97). The models predicted chemisorption mechanisms on ChFe hydrogel composites. Electrostatic attractions with –NH3+ and –OH2+, ligand-exchange inner-sphere complexes formation and bidentate corner-sharing (2C) and bidentate edge-sharing (2E) trimetric surface complexes formation have been proposed as the adsorption mechanism of As(V) into ChFe hydrogel. 0.1 M CH3COOH showed the best regeneration pattern with 75, 96, 81, 53 and 43 % of 1st, 2nd, 3rd, 4th and 5th adsorption respectively. Because of this re-usable capability, the As(V) adsorption capacity is not a single value from one adsorption cycle, but a cumulative value of several adsorption cycles and it was 17.39 mg/g for five adsorption cycles. Open for regeneration and reuse, no post-treatment is needed for adsorbent-water separation, allow applications of the ChFe hydrogel composite in a wide range of applications such as water filtration and purification systems. The modification with ChFe further expands the application

关键词： Nanoparticles

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Preparation and properties of bimetallic Co/Cu ZIF-67 for electrochemical application 1

Preparation and properties of bimetallic Co/Cu ZIF-67 for el...

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1st Annual International Conference on Sensor Technology, INCOST 2023

作者： Wulandari, C. Gumilar, G. Nugraha Wasisto, H.S. Iqbal, M. Irzaman Nugroho, W.S. Rusydi, F. Doctoral Program of Engineering Physics Faculty of Industrial Technology Institut Teknologi Bandung Ganesha 10 Bandung40132 Indonesia Advanced Functional Materials Research Group Institut Teknologi Bandung Bandung40132 Indonesia PT Biostark Analitika Inovasi Bandung40375 Indonesia Bandung40135 Indonesia Research Center for Nanosciences and Nanotechnology Institut Teknologi Bandung Bandung40132 Indonesia PT Nanosense Instrument Indonesia Umbulharjo Yogyakarta55167 Indonesia Department of Physics Faculty of Mathematics and Natural Sciences IPB University Bogor16680 Indonesia Departement of Veterinary Public Health Faculty of Veterinary Medicine Universitas Gadjah Mada Yogyakarta55281 Indonesia Department of Physics Faculty of Science and Technology Universitas Airlangga Surabaya60115 Indonesia

Efforts to enhance the electrochemical properties of materials have become the focus of numerous studies because these properties are essential in various fields of application. Zeolitic imidazole framework-67 (ZIF-67) is a type of metal-organic framework (MOFs) expected to demonstrate excellent performance in electrochemical applications due to its numerous distinct properties. Consequently, various strategies and techniques have been developed to improve the electrochemical performance of ZIF-67. In this study, we employed bimetallic ZIF-67 constructed with cobalt (Co) and copper (Cu) metal ions within the imidazole frameworks. The use of bimetal is expected to increase conductivity and fine-tune the physicochemical properties of ZIF-67. Using coprecipitation methods, we synthesized both single-metal and bimetallic ZIF-67 and compared their characterizations. The addition of Cu metal ions does not alter the materials phase, ensuring compatibility with the single-metal ZIF-67 structure. However, the rhombic dodecahedron morphology of ZIF-67 shifts from a smooth to a concave and rough surface in Co/Cu ZIF-67. Furthermore, Co/Cu ZIF-67 exhibits higher peak current on their cyclic voltammetry (CV) curve by 46.15 μA. The results effectively illustrate the advantages of bimetal on ZIF-67 properties and performance. Finally, this study succesfully briefly demonstrate the potential development of Co/Cu-based ZIF-67 for various electrochemical applications. © Published under licence by IOP Publishing Ltd.

关键词： Metal ions

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Enhanced photodegradation of pentafluoropropionic acid (PFPA) via TiO₂-synthetic zeolite composites: A sustainable approach for effective defluorination

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Journal of Water Process engineering 2024年 62卷

作者： Halder, Subham Chou, Feng-Chih Wan, Tsz-Kin Tsai, Yi-Tien Cheng, Pei-Cheng Lin, Yuan-Chung Institute of Environmental Engineering National Sun Yat-Sen University Kaohsiung 804 Taiwan Center for Emerging Contaminants Research National Sun Yat-Sen University Kaohsiung 804 Taiwan Department of Public Health College of Health Science Kaohsiung Medical University Kaohsiung 807 Taiwan Doctoral Degree Program in Toxicology College of Pharmacy Kaohsiung Medical University Kaohsiung 807 Taiwan

Water pollution stemming from non-metal contaminants, notably fluorine, poses a grave health risk. The prevalent organic fluoride called pentafluoropropionic acid (PFPA), necessitates efficient remediation. Employing photocatalysis, this study strives to synthesize titanium dioxide (TiO₂) via microwave assisted sol-gel technique, integrating a natural-resource-based zeolite carrier to synthesize photocatalyst/zeolite nanocomposite for the removal of fluorinated compounds from water by degradation of PFPA. Minitab-17 facilitates data analysis, with the reaction surface (RS) method optimizing parameters: 0.5 g dosage, UV irradiation, and alkaline conditions. The RS model predicts a 60.2 % removal efficiency, closely aligning with the observed 58.7 % removal. Energy efficiency is pursued through microwave hydrothermal synthesis, while secondary aluminium slag and waste glass contribute to zeolite synthesis, promoting waste reduction and recycling in harmony with circular economy principles. © 2024

关键词： Degradation Pentafluoro propionic acid (PFPA) Response surface (RS) Titanium dioxide (TiO2) Ultraviolet (UV) Zeolite

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5G Channel Model for 28 GHz frequency in Palembang

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Journal of Physics: Conference Series 2020年第1期1500卷

作者： B Alfaresi Z Nawawi R F Malik K Anwar Electrical Engineering Universitas Muhammadiyah Palembang Indonesia Doctoral Program of Engineering Science Universitas Sriwijaya Indonesia Electrical Engineering Universitas Sriwijaya Indonesia Computer Science Department Universitas Sriwijaya Indonesia Center for Advanced Wireless Technologies (AdWiTech) Telkom University Indonesia

Next generation wireless technology require a wide frequency band. Current technology use a frequency of below 3 GHz which cannot provide a wide frequency band due to quite dense frequency utilization. The mm-Wave frequency guarantee to provide a wide band frequency band. The use of mm-Wave frequency will be influenced by climate factors. The characteristics of a place will cause a different channel model. Channel Model is useful for minimizes errors and maximizes information transmission or bitrate in communication model. The Channel Model will be represented as a PDP (Power Delay Profile). Channel model performance uses the Outage performance parameter in Shannon Theorem Implementation. Validation results using the CP-OFDM system with 5G BPSK. The parameters used for validation are FER and BER. In this paper, channel models will be analysed based on the characteristic of Palembang area as a reference channel model in Outer of Indonesia. Hopefully, it can be used as a reference for the development 5G wireless system.

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