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Simulation of arrow-shaped micromixer with obstacles in blood plasma mixing

AIP Conference Proceedings 2024年第1期3080卷

作者： Ziyan Muhammad Aqsha Basari Mohammad Akita Indianto Ridho Irwansyah Muhammad Satrio Utomo Siti Fauziyah Rahman Biomedical Engineering Study Program Department of Electrical Engineering Faculty of Engineering Universitas Indonesia Kampus UI Depok West Java 16424 Indonesia Research Center for Biomedical Engineering Faculty of Engineering Universitas Indonesia Kampus UI Depok West Java 16424 Indonesia Energy Systems Engineering Graduate Program Faculty of Engineering Universitas Indonesia Kampus UI Depok West Java 16424 Indonesia Department of Mechanical Engineering Faculty of Engineering Universitas Indonesia Kampus UI Depok West Java 16424 Indonesia Research Center for Metallurgy National Research and Innovation Agency Komplek PUSPIPTEK Setu Tangerang Selatan Banten 15314 Indonesia

In recent years, several applications of micromixers have been reported to have a number of advantages, including the use of small amounts of plasma, short reaction times, and good reaction efficiency. The samples analyzed in this study were blood plasma and distilled water. The process is carried out by passive mixing which is based on a microchannel structure to enhance the diffusion of molecules for efficient mixing. The arrow shape was chosen as the micromixer design because it has a better blending performance than the T and Y shapes. The types of obstacles also used to improve the mixing process. The simulation was carried out on COMSOL Multiphysics software version 5.6. The results showed better mixing results for the micromixer design with triangle right facing obstacles with the highest Reynolds number was 9.4326. Then followed by ellips obstacles with a value of 9.4322, then without obstacles that is 9.4309, after that the triangle left facing with a value of 9.4006, and finally the lowest Reynolds number is a design with a diamond obstacles of 9.2514.

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Unit processes identification of maintenance on rigid and flexible pavement of local road 7

Unit processes identification of maintenance on rigid and fl...

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7th International Conference on Euro Asia civil engineering Forum, EACEF 2019

作者： Handayani, F.S. Pramesti, F.P. Setyawan, A. Doctoral Program in Civil Engineering Faculty of Engineering Sebelas Maret University Surakarta Indonesia Civil Engineering Department Faculty of Engineering Sebelas Maret University Surakarta Indonesia Civil Engineering Department Faculty of Engineering Sebelas Maret University Surakarta Indonesia

Maintenance and rehabilitation as parts of pavement's life cycle become more important since it's an effort to restore the road condition as planned. This process will produce the emission of greenhouse gases that give an impact to the environment. The Live Cycle Assessment (LCA) was used to estimate the GHG's emissions. With LCA we could identify the unit process that will produce the GHG's emissions during maintenance and rehabilitation of road pavement. This research aimed to identify the unit processes of the maintenance and rehabilitation of rigid and flexible pavement and to analyse the amount of GHG emitted during this process. Four local roads in Indonesia were investigated as case studies. The result indicated the amount of energy of the unit processes as well as the GHG amount. This will lead to the identification of the hotspot of flexible and rigid pavement maintenance process. In rigid pavement maintenance activities, the hotspots included the asphalt transport process to asphalt mixing plant, cement transportation to the batching plant, and cement processing. Meanwhile, in flexible pavement maintenance activities, the hotspots were the asphalt transportation to asphalt mixing plant, transportation aggregate, and transportation to site. © Published under licence by IOP Publishing Ltd.

关键词： Asphalt

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A study on Durability for Rigid Pavement Against Acid Environment and Displacement Model

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IOP Conference Series: Materials Science and engineering 2021年第1期1144卷

作者： Wahyu Widodo Civil Engineering Study Program Faculty of Engineering Universitas Muhammadiyah Yogyakarta Indonesia.

An acidic environment commonly found in peat soils or expansive soil will harm the quality of rigid pavement by considering its use at long-life plan, traffic load, and minimization of damage to the crossroad due to vehicle braking. As a concrete provider, chemical admixture as mixed materials today is widely used with the reasons of workability, initial strength, as well as saving of material used. This research aimed to find out the durability of concrete admixture using sika-NN and plastocrete (retarding and water reducing admixture) at the acid environment and knowing the displacement that occurred using ABAQUS software modeling. It used the laboratory experimental method and the cube concrete sample 15×15×15 cm with the compressive strength of 33.2 MPa. A total of 18 concrete samples were immersed using normal pH water and H2SO4 at pH 1 ± 1 tested at 3, 7, 14, 28, 60, and 90 days using the Duplo method. In this research, the concrete durability was carried out using, Ultrasonic Pulse Velocity Test (UPVT) to test the density, compressive test, and modeling concrete displacement on peat soils with vehicle loads in acidic environments using software ABAQUS. The mixed design results show an average setting time value of about 112 minutes. Coarse aggregate and cement decrease due to additives is approximately 24% and 18% respectively, increasing the use of fine aggregate to 16.49%, but the value of concrete density increases base on soaking time. Besides that, there is a decrease in compressive strength up to 16% at the age of 90 days. The value of displacement in the modelled pavement uses a maximum load of 8 tons each 2.994 mm for concrete with normal water and 3.045 mm for concrete with an acid environment respectively. Concrete soaked in acid water is the greatest deformation that occurred in rigid pavement using ABAQUS and indicates that acid water has an impact on decreasing concrete quality.

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Traffic impact analysis construction of Grha Padmanaba

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AIP Conference Proceedings 2023年第1期2846卷

作者： Raafi Widyaputra Yulianyahya Kalimantan Institute of Technology Civil Engineering and Planning Department Civil Engineering Study Program Jl. Soekarno Hatta No.KM 15 Karang Joang Balikpapan Utara Balikpapan Kalimantan Timur 76127 Indonesia

The construction of Grha Padmanaba is expected to impact the performance of surrounding traffic. At the time of operation, the number of students will amount to 765 students, so the development of Grha Padmanaba belongs to the mandatory Traffic Impact Analysis (TIA) category. The study’s goal was to identify traffic performance around development areas, predict the rise and pull that occurs, and predict the impact caused. The analysis method used is the Indonesian Road Capacity Manual 1997 (MKJI, 1997). Output from MKJI 1997 is used delay and degree of saturation, where the delay and degree of saturation are used to see the existing condition of traffic around the site before the construction and predictions when building operations and predictions for the next five years. The result obtained from the prediction analysis during Grha Padmanaba operations in 2022 is an increase in the degree of saturation in McD Sudirman Not Signal Intersection, Gramedia, and Terban Intersection. Then the prediction of the following five years conditions shows a significant increase in those intersections. From the analysis results obtained then concluded some recommendations to minimise the density that occurs due to the operation of Grha Padmanaba.

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Disaster risk reduction of mount agung cold lava flood at the Bali cultural centre in Klungkung Regency

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IOP Conference Series: Earth and Environmental Science 2022年第1期989卷

作者： I.N. Sutarja M.D.W. Ardana S.P. Gustave Civil Engineering Study Program Faculty of Engineering Udayana University Bali Indonesia Centre for Disaster Studies Udayana University. Disaster Risk Reduction University Forum

The Bali Province Government plans the development of Bali Cultural Centre as a comprehensive cultural information centre to support the development of Culture-oriented Bali Tourism. The Bali Cultural Centre site is situated in an area of post-mining remnants in Klungkung Regency. The sites located at coordinates 8°32'41.35' - 8°34'30.94' South Latitude and 115°24'54.92' - 115°26'6.99' East Longitude. This site is also portion of estuary area of the Unda River which has a high potential for the danger of cold lava flood from the Mount Agung eruption. The structure to manage cold lava floods at the Unda River estuary is being conducted. The construction is divided into two locations which design to satisfactory a 50-year design flood with discharge of 1436.11 m3 per second. The first location is at upstream (north side of Prof. Ida Bagus Mantra Street) using a single rectangular cross section. The second location is at downstream (south area of Prof. Ida Bagus Mantra Street) using a combine double rectangular cross section. These two types of cross sections are designed to accommodate the capacity of water discharge under normal conditions and still able to drain water discharge in the 50-year return period. The presence of this channel allows the cold lava flood flow directly towards the sea-shore and so as to reduce the risk. It is possible that the sediments settle at the base of the channel, therefore, channel shape normalization and periodic dredging for maintenance are essential.

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Upcycling can waste and plastic bottle as functional material: Analysis of green process and simultaneous adsorption-photocatalytic performances

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Case Studies in Chemical and Environmental engineering 2025年 11卷

作者： Nurherdiana, Silvana Dwi Rahimah, Alya Dirja, Ramadhanu Tungga Dewi, Kun Prasasti Ramadhani, Mohamad Rizki Nugraha, Reva Edra Fitriana Wafi, Abdul Master of Environmental Science Study Program Faculty of Engineering and Science Universitas Pembangunan Nasional Veteran Jawa Timur Jl. Rungkut Madya No. 1 Gn. Anyar Kec. Gunung Anyar East Java Surabaya 60294 Indonesia Study Program of Chemical Engineering Faculty of Engineering and Science Universitas Pembangunan Nasional Veteran Jawa Timur Jl. Rungkut Madya No. 1 Gn. Anyar Kec. Gunung Anyar East Java Surabaya 60294 Indonesia Low Carbon Technology Research Centre Universitas Pembangunan Nasional Veteran Jawa Timur Jl. Rungkut Madya No.1 Gn. Anyar Kec. Gunung Anyar East Java Surabaya 60294 Indonesia Department of Physics Universitas Negeri Surabaya East Java Surabaya 60231 Indonesia Research Center for Food Technology and Processing National Research and Innovation Agency (BRIN) Gading Playen Gunungkidul Yogyakarta 55861 Indonesia

This study presents an investigation of chemical and physical characterization, green process analysis, techno-economic considerations, and carbon emissions for synthesizing metal-organic frameworks (MOFs) from plastic and can waste using microwave-assisted synthesis. The microwave-assisted synthesis proves to be more cost-effective, with a reduction in CO₂ emissions by up to 80%. The synthesized material (MIL-Mw-U) demonstrates excellent performance in methylene blue (MB) removal, achieving 98.41% removal, with 97.87% removal although the catalyst is used in the third cycle. The adsorption of methylene blue (MB) onto MIL-Mw-U achieved a maximum capacity of 295.26 mgg⁻¹ at pH 3 and decreased to 258.68 mgg⁻¹ at pH 11 due to OH⁻ competition. The Langmuir isotherm (R² = 0.9381) and pseudo-second-order kinetics (R² = 0.999) confirmed monolayer chemisorption as the dominant mechanism. This innovative approach supports circular economy principles by converting can and plastic bottle waste into functional material for dye removal, offering sustainable solutions for environmental challenges. © 2025 The Authors

关键词： Adsorption Dye removal Green chemistry Metal organic frameworks Photocatalytic SDGs 13 Climate Change

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The effect of groove welding on mechanical properties and microstructure of wear resistance steel plate by Submerged Arc Welding 1

The effect of groove welding on mechanical properties and mi...

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1st International Symposium on Advances and Innovations in Mechanical engineering, ISAIME 2019

作者： Mansjur, Zuldesmi Sumual, Hendro M. Tamba, I.P. Mechanical Engineering Study Program Engineering Faculty Manado State University Indonesia Mechanical Engineering Education Department Engineering Faculty Manado State University Indonesia

Aim of this research is to analyze the mechanical properties and microstructure of wear resistance steel plates joined by Submerged Arc Welding at different grooves welding. The welding current of 300 Ampere, voltage of 28 Volt and travel speed of 38 cm/min was applied. The microscopical examination methods were used for weld zones. Impact toughness and rockwell hardness test were obtained from the weld metal, heat affected zone and the base metal samples. The fracture surfaces were examined by using optical microscope. As results, there was no difference of hardness and microstructure among three grooves welding. The significant differences were detected at the weld zones. Base metal had the highest hardness value. Ferrite and pearlite phases were obtained at three weld zones, but the heat affected zone had coarser grain structure than the base metal. Weld metal volume and electrode length significantly affected the impact toughness of joint, where the larger of the weld metal volume and length of electrode fill in the groove welding, the higher of impact toughness. The lowest impact energy and toughness value were attained at V groove and the highest was at I groove. The fracture surfaces at all groove welds showed ductile fracture dominantly. © Published under licence by IOP Publishing Ltd.

关键词： Fracture toughness

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Implementation of ISO certification in educational organization

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AIP Conference Proceedings 2022年第1期2489卷

作者： Sudjani Sudjani Building Engineering Education Study Program Department of Civil Engineering Education FPTK Universitas Pendidikan Indonesia Bandung Indonesia

Why do educational institutions require ISO certification? "In order to have a common language among educational institutions at home and abroad," The similarity of language in question is the similarity of quality indicators owned by an educational institution, in this case the Educational Organization. Basically, there are three components of the quality assurance system of a Educational Organization: database, internal quality control system (SPMI), and external quality control system (SPME). The database contains the evaluation results for each semester of each study program at university. SPMI is usually run by the Quality Assurance Agency owned by each university, while SPME is run by external agencies of university that test and certify, one of which is ISO 9001:2008/2015 certification. ISO certification is an international standard for Quality Management System (QMS). At Educational Organization, the main indicator of quality management is the commitment of a university in its education, especially in its efforts towards an international university. One of the institutions issuing ISO certification is NQA. There are six assessment criteria specified in the ISO certification test. The six criteria are documentation control, record control, product control, internal audit, product development (improvement), and product correction. Products in the Educational Organization is the education given a university to its students. The quality of education is also measured from the level of satisfaction of companies that use graduates of a university.

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Experimental study of Mortar Compressive Strength with Anadara Granosa Powder as a Substitute for Partial Use of Cement 1

Experimental Study of Mortar Compressive Strength with Anada...

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1st International Conference of Construction, Infrastructure, and Materials, ICCIM 2019

作者： Sandjaya, A. Tavio Christianto, D. Bachelor of Civil Engineering Study Program Universitas Tarumanagara Tomang Grogol Petamburan West Jakarta Indonesia Bachelor of Civil Engineering Study Program Institut Teknologi Sepuluh Nopember Keputih Sukolilo Surabaya Indonesia

Making cement produces carbon dioxide (CO2) gas which results in the greenhouse effect. To reduce the use of cement, alternative materials are examined. One of the raw materials for making cement is limestone. Limestone is a sedimentary rock mainly composed of calcium carbonate. Blood clams (Anadara Granosa) are tried to replace cement because they have a high calcium carbonate mineral composition. Blood clams are crushed into powder and filtered using No.325 filter. Cement is replaced by weight by 5%, 10%, 15%, and 20%. Mortar specimens in the form of cubes with a size of 5 cm. Mortar compressive strength test was carried out at 7 and 28 days. Anadara Granosa powder reacts very weakly with water and increases the initial compressive strength of the mortar. The results of Anadara Granosa mortar compressive strength test at 7 days were higher than normal mortar. The most efficient composition is indicated by cement replacement of 20%. © Published under licence by IOP Publishing Ltd.

关键词： Cements

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Application of Technology Acceptance Model to E-learning Assessment (Kelase) in Agricultural Technology Education, UniversitasNegeri Makassar 1

Application of Technology Acceptance Model to E-learning Ass...

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1st International Conference on Education, Science and Technology 2019, ICESTech 2019

作者： Sukainah, A. Reski, P.P. Fadilah, R. Mustarin, A. Program Study of Agricultural Technology Education Faculty of Engineering UniversitasNegeri Makassar Indonesia

Kelase is an E-learning program that has been applied in the Agricultural Technology Education (PTP), especially in the Toxicology and Food Safety courses. This study aims to analyze application and acceptance of PTP students to Kelase, as well as variable correlation and linearity used in the Technology Accepted Model (TAM) method. The independent variables in this study consisted of variables perceived ease of use and perceived usefulness, while the observation variable was acceptance. Techniques for collecting data through giving questionnaires. The questionnaire instrument was tested for its validity and reliability. Data measurement scale uses Likert scale. Data processing uses IBM SPSS 20.0 software. The results show that level of perception of PTP student admissions is very high, which is between 70.1-91%. The correlation of TAM variable is significant and positive. Both variables, perceived ease of use (X1) and perceived usefulness (X2), are very influential on acceptance (Y) and both of these variables simultaneously influence the level of student acceptance of Kelase. The regression determination coefficient is generated, which is 52%. These results indicate that the influence of variables perceived ease of use (X1) and perceived usefulness (X2) is only 52%, and the rest, which is 48% influenced by other variables. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Students

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