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Optimum height of the retaining gravity wall

IOP Conference Series: Earth and Environmental Science 2021年第1期708卷

作者： F Bari J A Repadi F A Ismail riani A Hakam Doctoral Program Dept. Of Civil Eng Faculty Of Engineering Andalas University Indonesia. Lecturer Dept. Of Civil Eng Faculty Of Engineering Andalas University Indonesia.

Many failure cases of retaining walls caused by some factors, which are soil condition, planning design that did not meet the safety requirements, and the lack of knowledge or indecisiveness towards the selection of the retaining walls type for a specified height. In this research, the optimum height of a retaining wall of gravity wall type for sandy soil was planned. The research methodology was done by calculating external and internal stability from a stone gravity retaining wall. From the external stability analysis of 4 - 14 meters heights, it is known that the retaining wall still safe. The internal stability analysis obtained from 8 meters heights did not meet the safety requirements. Therefore, it is recommended from the research to use the height of 7 meters for the stone gravity retaining wall. The optimum height of retaining wall is planned in this research as the guidelines for engineers in planning the right retaining wall for the height as planned.

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A simulation of R32 refrigerant mixing with R1270 to reduce GWP R410A on wall mounted air conditioning

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IOP Conference Series: Materials Science and engineering 2021年第6期1098卷

作者： W Widodo B F T Kiono S H Winoto M S K T S Utomo Doctoral Study Program in Mechanical Engineering Faculty of Engineering Diponegoro University Jl. Prof Soedarto SH Tembalang Semarang 50275 Indonesia

Refrigerant R410A is a cooling barrier that is still widely used for air conditioning. This R410A contains the Fluoro element which can increase the value of GWP. In this research simulation, we used an AC unit using R410A with the aim of reducing GWP (Global Warming Potential) by mixing synthetic refrigerant with hydrocarbons. R410A still has content GWP: Mixing using R32 / R1270 refrigerant is predicted to reduce the GWP value because R1270 is one of the hydrocarbon refrigerants that has a GWP value of only: 3. By using Refprop software it can be simulated a mixture composition starting from 50/50, 40/60, 30/70, 20/80 and 10/90. From the results of the mixture simulation conducted, obtained a mixture approaching the characteristics of R410A, namely in the mixture: 20/80 with COP: 5.17 while R410A: 4.12. Compression ratio: R410A: 2.0 and for mixed refrigerants 20/80: 1.9. The refrigerant effect of mixed refrigerants is 20/80: 254,51, R410A: 162,77. Using this refrigerant mixture can reduce the GWP value and improve the performance of the AC cooling system. This refrigerant has considerable potential to replace the R410A.

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Testing specificity and sensitivity of wastewater-based epidemiology for detecting SARS-CoV-2 in four communities on Vancouver Island, Canada

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Environmental Advances 2022年 9卷 100310页

作者： Masri, Nadia Zeina Card, Kiffer George Caws, Emmanuelle A. Babcock, Alana Powell, Ryan Lowe, Christopher J. Donovan, Shelley Norum, Shelley Lyons, Shirley De Pol, Sean Kostenchuk, Lareina Dorea, Caetano Lachowsky, Nathan J. Willerth, Stephanie M. Fyles, Thomas M. Buckley, Heather L. Division of Medical Sciences University of Victoria Victoria V8W 2Y2 BC Canada Faculty of Health Sciences Simon Fraser University Canada Department of Civil Engineering and Centre for Advanced Materials and Related Technologies (CAMTEC) University of Victoria Canada Environmental Monitoring Program Capital Regional District Canada Regional District of Nanaimo Canada Pani Energy Inc. Canada Department of Civil Engineering Department of Chemistry and Centre for Advanced Materials and Related Technologies (CAMTEC) University of Victoria Canada School of Public Health and Social Policy University of Victoria Canada Department of Mechanical Engineering and Division of Medical Sciences University of Victoria Centre for Advanced Materials and Related Technologies (CAMTEC) University of Victoria Canada School of Biomedical Engineering University of British Columbia Canada

We report wastewater surveillance of the spread of SARS-CoV-2 based upon 24-h composite influent samples taken weekly from four wastewater treatment plants (WWTP) on Vancouver Island, BC, Canada between January 3, 2021 and July 10, 2021. Samples were analyzed by reverse transcription quantitative polymerase chain reaction targeting the N1 and N2 gene fragments of SARS-CoV-2 and a region of the replication associate protein of the pepper mottle mosaic virus (PMMoV) serving as endemic control. Only a small proportion of samples had quantifiable levels of N1 or N2. Overall case rates are weakly correlated with the concentration (gene copies/L) and with the flux of viral material influent to the WWTP (gene copies/day);the latter accounts for influent flow variations. Poisson multimodal rank correlation accounts for differences between the four WWTP and shows a significant correlation with a significant positive intercept. Receiver operator characteristics (ROC) analysis confirms a cut-off of cases based on amplified/not-amplified experimental data. At the optimal cut point of 19 (N1) or 17 (N2) cases/week/100,000 the sensitivity and specificity is about 75% for N1 and 67% for N2. © 2022 The Authors

关键词： Pepper mild mottle virus qPCR SARS-CoV-2 Sensitivity Specificity Wastewater surveillance Wastewater-based epidemiology

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Correlation analysis to the linear factors on layer egg demand

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AIP Conference Proceedings 2023年第1期2628卷

作者： A. R. Siregar P. Astaman M. Darwis A. Ahmad D. M. Raisa Department of Socio-Economics Faculty of Animal Husbandry Universitas Hasanuddin Makassar Indonesia Agribusiness Study Program Faculty of Agriculture Muhammadiyah Sinjai University Sinjai Indonesia Research and Development Centre of Dynamics Community Culture and Humanities Institute for Research and Community Services Universitas Hasanuddin Makassar Indonesia Faculty of Engineering and Business Muhammadiyah Sinjai University Sinjai Indonesia

The study aimed to analyze how strong the relationship between egg demand and linear factors is. Chicken eggs have a contribution of animal protein for the community, so their existence needs to be maintained. The study was conducted in Biringkanaya District, Makassar City which was selected purposively by considering this area has the largest population. Sampling was carried out by proportional random sampling method, in 5 regions that had the largest number of households, so that the number of respondents who were considered capable of representing the total population was 50 respondents. The results showed that the tested variables X and Y variables had a significant correlation, which was supported by the F Change value of 0.001, so the null hypothesis (H0) was rejected and the alternative hypothesis (Ha) was accepted. Meanwhile, there is simultaneous multiple correlations between the independent variables, the price of layer eggs (X1), the price of chicken meat (X2), the price of tempeh (X3), the price of tofu (X4), and income (X5). and the dependent variable demand for layer eggs (Y) has a strong and positive relationship seen from the correlation coefficient (R) of 0.615.

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The effect of interval of application of Nicotiana tabacum extract on growth parameters of Oryza sativa Inpari-32

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AIP Conference Proceedings 2022年第1期2534卷

作者： Dadang Sumardi Raden Adistie Parasati Rijanti Rahaju Maulani Sony Suhandono Andre Fahriz Perdana Harahap Misri Gozan 1Agricultural Engineering Study Program School of Life Sciences and Technology (SITH) Institut Teknologi Bandung Jalan Ganesha No. 10 Bandung 40132 Indonesia 2Department of Chemical Engineering Faculty of Engineering Universitas Indonesia Kampus Baru UI Depok 16424 Indonesia

The domestic consumption of rice (Oryza sativa) in Indonesia are increasing because of the population growth. One of the ways to increase rice productivity is by using external compounds such as plant growth regulators (PGRs) or phytohormones that function to affect growth. Tobacco plants can also be used as PGR because they contain allelopathic substances, organic matter, and other phenolic compounds that can affect plant growth. This study aims to determine the effect of intervals of tobacco extract application on the growth and yield of rice plants of the Inpari 32 variety. The study was conducted in a Randomized Block Design (RBD) with 4 interval treatments (control F0; once a week F1, once every two weeks F2, and every three weeks F3). One-Way ANOVA test was done at a 5% level and continued with a DMRT test, with variables of plant height, number of leaves, number of tillers, growth rate, phytohormones (auxin IAA; and gibberellic acid GA3), flowering age, harvest age, shoot and root dry weight, stover shoot root ratio, 1000 grain weight, the ratio of pithy rice grain to rice grain. Total, seed weight per clump, grain weight per plant, and productivity (tons/ha). The study results were that the application interval treatment did not show a significant effect on all test parameters, but the treatment interval of application of tobacco extract once a week (F1) showed a tendency for better results especially in the number of leaves.

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The combination effect of concentration and application interval of Nicotiana tabacum extract on growth of Oryza sativa Inpari 32

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AIP Conference Proceedings 2022年第1期2534卷

作者： Rijanti Rahaju Maulani Dhaifan Dito Adrian Sony Suhandono Muhammad Yusuf Arya Ramadhan Misri Gozan Dadang Sumardi 1Agricultural Engineering Study Program School of Life Sciences and Technology (SITH) Institut Teknologi Bandung Jalan Ganesha No. 10 Bandung 40132 Indonesia 2Department of Chemical Engineering Faculty of Engineering Universitas Indonesia Kampus Baru UI Depok 16424 Indonesia

Rice is a commodity which production continues to be increased in Indonesia due to the increasing demand and consumption per capita. The use of intensive agriculture and inorganic fertilizers that leave residues on the land makes fertilizers ineffective. Tobacco plants commonly used as pesticides can be used as organic materials that can increase rice growth because they contain nutrients and various allelochemical compounds. This study aims to determine the effect of tobacco extract application at various concentrations and interval combination treatments on growth parameters consisting of plant height rate, number of tillers, number of leaves, root dry weight, shoot dry weight, shoot-root ratio, flowering period, and the concentration of phytohormones (IAA and GA3) in rice (Oryza sativa) variety Inpari 32. The study was conducted by the application of tobacco extract consisting of 9 treatments which were a combination of concentration (1-3ml/L) and intervals application (1x in 1-3 weeks) and one control (without the administration of tobacco extract) for a total of 10 treatments, with three replications of each treatment. The results showed that the combination of concentration and interval of applications of tobacco extract had no significant effect on the parameters of plant height, tiller number, leaf number, shoot dry weight, flowering period, and phytohormones (IAA and GA3) concentrations in rice (Oryza sativa) Inpari 32 variety, and affect the parameters of dry root weight and shoot-root ratio slightly.

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Aluminium Recovery from Water Treatment Sludge as Coagulant by Acidification

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IOP Conference Series: Earth and Environmental Science 2020年第1期448卷

作者： D P Ruziqna N Suwartha S S Moersidik S Adityosulindro Environmental Engineering Study Program Department of Civil Engineering Faculty of Engineering Universitas Indonesia Depok 16424 Indonesia

Aluminium in water treatment sludge can be recovered as coagulants by acidification method. However, there are some factors that affect efficiency in recovering aluminium, such as stirring speed during acidification, pH, and sludge characteristic. This study aims to find the optimum acidification stirring speed in recovering alum and to evaluate the performance of recovered coagulant compared to a pure coagulant. Aluminium recovery is carried out by adding sulphuric acid until the pH of the sludge reaches 2.5. The acidic sludge is stirred for 30 minutes, with acidification stirring speed is varied from 240–720 rpm, and left for settling until the supernatant is formed. The supernatant was used as a recovered coagulant, examined using a jar test to determine the optimum dose, and compared with the pure coagulant. The results show that the optimum acidification stirring speed was obtained at 540 rpm, where mass balance shows aluminium recovery efficiency of 16.5%. The optimum dose for recovered coagulant was 25 ppm, with a turbidity reduction of 93.38% in jar test. While the optimum dose for pure alum was 20 ppm, with turbidity reduction of 93.26%. Though potentially reduced higher turbidity, the recovered coagulant has slightly lower quality than the pure coagulant, which required a higher optimum dose.

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The influence of sintering temperatures and sizes of dolomite foaming agent on porosity of Mg-6Zn alloy

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AIP Conference Proceedings 2024年第1期3003卷

作者： Bintoro Siswayanti Galih Senopati Aprilia Erryani Fanciska Pramuji Lestari Ika Kartika Lalu Suhaimi Gustini Dian Lestari Research Center for Metallurgy National Research and Innovation Agency (BRIN) KST B.J Habibie Gedung Manajemen 720 South Tangerang Banten 15314 Indonesia Sumbawa University of Technology Faculty of Engineering Metallurgical Engineering Study Program Jl. Raya Olat Maras Batu Alang Moyo Hulu Pernek Kec. Moyo Hulu Kabupaten Sumbawa Nusa Tenggara Barat 84371 Indonesia

Magnesium alloys like one of the bioabsorbable implant materials expected to help heal tissue without implant residues, therefore are no need to take the implant for a second surgery. One of the expected performances of metal implants is its ability to support cancellous bone growth, namely porous bone that encloses large spaces and has a spongy nature or appearance, therefore metallic magnesium foams are used in bone implants to approach the natural structure of bones. This study aims to evaluate the effect of dolomite (CaMg(CO3)2) size as a foaming agent to produce porosity on Mg-6Zn alloy. Powder metallurgy is used to produce metallic magnesium foams. Magnesium powder 0.06-0.3 mm granulometry mixed with zinc powder <63 µm granulometry and dolomite powder with varying sizes 20, 25, and 30 mesh. The mixed powder was compacted and sintered at varying temperatures of 650, 675, and 700°C. The smallest porosity is found in the Mg6Zn10CaMg(CO3)2 alloy with a #25 mesh foaming size and a sintering temperature of 650°C, or 10.77%. Meanwhile, the highest porosity was found in the mesh alloy Mg-6Zn-10CaMg(CO3)2 #20 with a sintered temperature of 700°C, or 53.26%. These results indicate that the higher the sintering temperature in the alloy, the greater the percentage of pores formed and the smaller the density value produced in the alloy.

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Development of application Information System in Rhee District

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Journal of Physics: Conference Series 2021年第1期1933卷

作者： Shinta Esabella Hikmawati Intan Muhammad Hidayatullah Titi Andriani G Gunawan Informatics Department Faculty of Engineering Universitas Teknologi Sumbawa Indonesia Electrical Engineering Department Faculty of Engineering Universitas Teknologi Sumbawa Indonesia Physics Education Study Program Faculty of Teacher Training and Education Universitas Mataram Indonesia

Management of patient data at the Technical Implementation Unit of the Community Health Center (UPT. Puskesmas) of Rhee Sumbawa District has not been fully computerized. The need for the development of an Information System to store medical records (history) of patient data. The research aims to develop information systems with descriptive research methods. For software development methods using Waterfall Models and built with Microsoft Visual Studio C# software and databases stored in Microsoft SQL Server software. Software testing uses Black Box Testing, which is testing software in functional terms. The results of research into digital data technology products that function to enter, change, delete data and minimize the time to find the data needed to improve the effectiveness and efficiency of data management.

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Post-occupancy evaluation based on occupant behavior aspect

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IOP Conference Series: Earth and Environmental Science 2021年第1期780卷

作者： Kustiani R P Khidmat Architecture Study Program Faculty of Engineering Universitas Bandar Lampung Indonesia Architecture Study Program Department of Regional and Infrastructure Technology Institut Teknologi Sumatera Bandar Lampung Indonesia

Building performance can be improved by investigating and evaluating previews of occupant behavior. Post-occupancy evaluation (POE) is a design analysis method used to direct and evaluate the physical and social elements of inhabited buildings. In recent years, the Ministry of Public Works and Public Housing grants student dormitory building to several Indonesian universities. In 2017, Institut Teknologi Sumatera (ITERA) Bandar Lampung Indonesia has been granted two of those student facilities. The building has been operated for three years. The student dormitory considered has one type of building that has a high capacity occupation. This research aims to measure user satisfaction and evaluate building facility and its implication to student learning effectively using the POE method, specifically human behavior aspects. During this time, POE is more focused on building physical behavior that includes energy and thermal aspects. In this study, the author tries to raise aspects of human behavior as an essential element supporting the sustainability of the building. The survey conducted using eight variables: territoriality, privacy, interaction, perception, crowdedness, adaptability, durability, and comfortability. This research focuses on measuring only female student dormitories. One hundred eighty-two respondents were involved in the survey. The result shows that the majority of respondents feel quite satisfied with all the variable measure. This finding can be a reference to improve the design consideration for future student dormitory design.

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