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study of the use of CaCO3 in the mixture of laston AC-BC as a filler

AIP Conference Proceedings 2023年第1期2882卷

作者： Indra Putra Kurnia Falderika Civil Engineering Study Program Universitas Komputer Indonesia Bandung West Java Indonesia

The abundance of limestone material deposits in Indonesia shows the great potential of applying local material technology to be used in road pavement mixes. Calcium Carbonate is a chemical compound with the chemical formula CaCO3 is a substance commonly found in rocks, one of which is limestone. This study aims to analyze the characteristics of the AC-BC asphalt mixture by utilizing CaCO3 material as a filler to increase the performance of the AC-BC asphalt mixture. The AC-BC layer is part of the surface layer which is located between the base course and the wearing course where its two main functions are to reduce stress and withstand the highest loads due to traffic loads. The tests were carried out based on the empirical method with the Marshall test which refers to the provisions of the properties of the Laston mixture (AC-BC) General Specifications of Highways and Bridges in 2018.

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Comments on "Optimization of Ultrasound-Assisted Extraction of phenolic compounds and anthocyanins from blueberry (Vaccinium ashei) wine pomace", Food Chemistry 204 (2016) 70-76, DOI: 10.1016/***.2016.02.094

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Food Chemistry 2024年 435卷 137527页

作者： Mangindaan, Dave Adib, Azmier Meindrawan, Bayu Febrianta, Harvey Hutabarat, Donald J.C. Civil Engineering Department Faculty of Engineering Bina Nusantara University K.H. Syahdan No. 9 Jakarta11480 Indonesia Waste-Food-Environmental Nexus Research Interest Group Bina Nusantara University K.H. Syahdan No. 9 Jakarta11480 Indonesia Independent Researcher West Jakarta11510 Indonesia Food Technology Department Faculty of Agriculture Sultan Ageng Tirtayasa University Serang42124 Indonesia Professional Engineer Program Department Faculty of Engineering Bina Nusantara University K.H. Syahdan No. 9 Jakarta11480 Indonesia Food Technology Department Faculty of Engineering Bina Nusantara University K.H. Syahdan No. 9 Jakarta11480 Indonesia

In this letter to editors, several comments are made to the paper by He and coworkers "Optimization of Ultrasound-Assisted Extraction of phenolic compounds and anthocyanins from blueberry (Vaccinium ashei) wine p... 详细信息

关键词： Anthocyanins

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Tensile Properties of coconut Coir single fiber with alkali treatment and reinforcement effect on unsaturated polyester polymer

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Materials Today: Proceedings 2020年 22卷 300-305页

作者： Arya Widnyana I Gde Rian I Wayan Surata Tjokorda Gde Tirta Nindhia Under graduate student at Study Program ofMechanical Engineering Engineering Faculty Udayana University Jimbaran Bali 80361 Indonesia Study Program ofMechanical Engineering Engineering Faculty Udayana University Jimbaran Bali 80361 Indonesia

Many reports related with alkali treatment on coir of coconut are available but the data related with the stress-strain curve is not provided. In this research stress-strain curve of tensile test data of the coconut single fiber obtained from alkali treatment with 5% NaOH is provided. Seven repetitions was conducted. The results indicate that the fiber is linier elastic with no indication as ductile material. The average of tensile strength is 130.9 MPa, failure (maximum) strain is 22.4 % and modulus of elasticity is 681.4 MPa. Randomly addition of 3 cm length of coconut fiber with fraction 15% in to the unsaturated polyester give maximum reinforcement that reach tensile strength of the composite about 24.5 MPa

关键词： Coconut single fiber tensile strength reinforcement unsaturated polyester

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The Anticancer and Apoptotic Activity of the Endophytic Fungus Phomopsis Sp. Isolated from Soursop Leaves in Mcf-7 Breast Cancer Cells: In Vitro and Computational in Silico Studies

SSRN

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SSRN 2025年

作者： Dwicesaria, Maheswari Alfira Priosoeryanto, Bambang Pontjo Hasan, Akhmad Endang Zainal Irsal, Riyan Alifbi Putera Gholam, Gusnia Meilin Mahendra, Fachrur Rizal Suminto, Syaefudin Indonesia Department of Biochemistry Faculty of Mathematics and Natural Sciences IPB University Dramaga Campus Bogor16680 Indonesia School of Veterinary Medicine and Biomedicine IPB University Bogor16680 Indonesia Faculty of Engineering Kyushu University Nishi-ku Fukuoka819-0395 Japan Tropical Biopharmaca Research Center IPB University Bogor16128 Indonesia Bioinformatics Study Program Faculty of Mathematics and Natural Sciences IPB University Bogor16680 Indonesia

This study investigated the anticancer potential of the endophytic fungus Phomopsis sp., extracted from soursop leaves. The metabolite profile of Phomopsis sp. was analyzed and its anticancer and apoptotic activities were assessed in both human breast cancer cell (MCF-7) and normal Vero cell lines. Phomopsis sp. were cultivated in yeast malt broth, extracted with ethyl acetate, and separated using column chromatography. The brine shrimp lethality test gave ten fractions (F1–F10), with F1 demonstrating the highest cytotoxicity (LC50 = 2.33 µg/mL). The obtained fractions were evaluated for antiproliferative effects, revealing an IC50 of 5.65 µg/mL for MCF-7 cells and 5.21 µg/mL for Vero cells, indicating effective anti-proliferation through apoptosis, as confirmed by acridine orange-ethidium bromide staining. Liquid Chromatography-tandem Mass Spectrometry identified 38 active compounds in F1, including known anticancer agents such as cytosporone C, kynurenic acid, maraniol, (-)-caryophyllene oxide, and chalcone. Computational in silico analyses utilizing PASS online, molecular docking, ADMET/pharmacokinetic studies, density functional theory (DFT) analysis, and molecular dynamics (MD) simulations further validated chalcone as a promising anticancer candidate. Chalcone exhibited favorable ADMET/pharmacokinetic properties and achieved the highest docking score -8.392 kcal/mol among the compounds tested. MD simulations over 300 ns demonstrated that chalcone outperformed tamoxifen, with binding energy calculations revealing a value of -227.069 kJ/mol compared to -45.598 kJ/mol for tamoxifen. These findings highlight the therapeutic potential of Phomopsis sp. and its bioactive compounds, particularly chalcones, as candidates for effective anti-breast cancer therapies. © 2025, The Authors. All rights reserved.

关键词： Column chromatography

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Floor Slab Analysis (Case study: One Residence Apartment Batam Center) 2

Floor Slab Analysis (Case Study: One Residence Apartment Bat...

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2nd International Conference on Mechanical, Electronics, Computer, and Industrial Technology, MECnIT 2018

作者： Astutik, Yayuk Setyaning Civil Engineering Study Program Planning and Civil Engineering Faculty Universitas Internasional Batam Riau Island29442 Indonesia

Reinforced concrete slab are widely used in civil buildings, including as building floors, roof floors, bridge floors and dock floors. The load acting on the slab is generally calculated against gravitational loads. This study aims to analyse floor slab in One Residence Batam Center Apartment Construction Project. The moment method is used to predict the magnitude of frame and shrinkage values that refer to 2002 of SNI. Loading is carried out from dead loads and live loads with a two-way reinforcement system. Reinforcement is done using steel with a diameter of 10 mm. So that the minimum area is 313 mm square with a distance of 250 mm and is in the safe category. From the calculation results obtained the concrete elastic modulus obtained by 250 MPa with a reinforcement ratio of 0.0025. Checking the time dependency factor for dead loads is carried out within 3 months, 6 months, 12 months and more than 5 years. Long-term deflection due to frame and shrinkage is still in the safe category. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Floors

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Asymptotically Accurate and Locking-Free Finite Element Implementation of First Order Shear Deformation Theory for Plates

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SSRN 2023年

作者： Le, Khanh Chau Bui, H.G. Institute for Advanced Study in Technology Ton Duc Thang University Ho Chi Minh City Viet Nam Faculty of Civil Engineering Ton Duc Thang University Ho Chi Minh City Viet Nam Helmholtz-Zentrum Hereon Geesthacht21502 Germany

A formulation of the asymptotically exact first-order shear deformation theory for linear-elastic homogeneous plates in the rescaled coordinates and angles of rotation is considered. This allows the development of its asymptotically accurate and shear-locking-free finite element implementation. As applications, numerical simulations are performed for circular and rectangular plates, showing complete agreement between the analytical solution and the numerical solutions based on two-dimensional theory and three-dimensional elasticity theory. © 2023, The Authors. All rights reserved.

关键词： Rectangular plate

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BATHYMETRY ESTIMATION USING MACHINE LEARNING AND TUNING DENSITY CONTRAST IN THE YAMATO BASIN OF THE EAST SEA (SEA OF JAPAN) 44

BATHYMETRY ESTIMATION USING MACHINE LEARNING AND TUNING DENS...

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44th Asian Conference on Remote Sensing, ACRS 2023

作者： Kim, Kwang Bae Kim, Ji Sung Yun, Hong Sik Department of Civil Architectural and Environmental System Engineering Sungkyunkwan University 2066 Seobu-ro Jangan-gu Gyeonggi-do Suwon16419 Korea Republic of School of Geography Faculty of Environment University of Leeds Woodhouse Lane LeedsLS2 9JT United Kingdom Interdisciplinary Program in Crisis Disaster and Risk Management Sungkyunkwan University 2066 Seobu-ro Jangan-gu Gyeonggi-do Suwon16419 Korea Republic of

ISBN: (纸本)9781713893646

The purpose of this study is to evaluate the accuracy of bathymetry predicted by the gravity-geologic method (GGM) using depth and gravity anomalies estimated using the optimized machine learning model determined from machine learning techniques around the Yamato basin in the East Sea. In this study, the optimized model using machine learning techniques was applied to estimate bathymetry using gravity-geologic method (GGM) from a tuning density contrast between seawater and the seafloor bedrock determined by downward continuation method using satellite altimetry-derived gravity anomalies. Bathymetry estimated using machine learning technique was assessed the accuracy in comparison with shipborne depth measurement obtained by the National Centers for Environmental Information (NCEI, https://***), the National Oceanic and Atmospheric Administration (NOAA, http://***). As a result, the GGM bathymetry predicted by the optimized machine learning model using a tuning density contrast of 13.63 g/cm3 in comparison with that using a density contrast of 1.67 g/cm3 shows the improvement of 67.40% in the RMSE at shipborne locations of the NECI. © 2023 ACRS. All Rights Reserved.

关键词： machine learning satellite altimetry-derived gravity anomalies tuning density contrast Yamato basin

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Quantitative Distribution of Antibiotic Resistance Genes and Crassphage in a Tropical Urbanized Watershed

SSRN

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SSRN 2024年

作者： Sresung, Montakarn Srathongneam, Thitima Paisantham, Phongsawat Sukchawalit, Rojana Whangsuk, Wirongrong Honda, Ryo Satayavivad, Jutamaad Mongkolsuk, Skorn Sirikanchana, Kwanrawee Research Laboratory of Biotechnology Chulabhorn Research Institute Bangkok10210 Thailand Program in Applied Biological Sciences Chulabhorn Graduate Institute Chulabhorn Royal Academy Bangkok10210 Thailand OPS MHESI Bangkok Thailand Faculty of Geosciences and Civil Engineering Institute of Science and Engineering Kanazawa University Kanazawa Japan Research Laboratory of Pharmacology Chulabhorn Research Institute Bangkok10210 Thailand Program in Environmental Toxicology Chulabhorn Graduate Institute Chulabhorn Royal Academy Bangkok10210 Thailand

As antimicrobial resistance continues to pose a significant threat to global health, this study provided a focused examination of the prevalence and behavior of key antibiotic resistance genes in aquatic environments. We investigated the quantitative distribution of intI1, sul1, blaTEM, blaNDM, blaVIM, mcr-1, tetQ, and crAssphage within wastewater influents (n=12), effluents (n=12) and river water samples (n=12), from three municipal wastewater treatment plants and three river locations in an urbanized watershed in Central Thailand over dry and wet seasons. The qPCR method demonstrated that intI1, sul1, blaTEM, and tetQ were most abundant in all samples (6.12 – 7.89 mean log10copies/100 mL), with all genes consistently uniform levels across diverse locations, suggesting the potential for any site to act as a monitoring sentinel. Although there is a significant reduction of ARG concentrations by WWTPs, the persistence of these genes in effluents points to the limited effectiveness of existing treatment methodologies. Temporal data indicated stable ARG concentrations over time, but tetQ levels rose during the wet season, in alignment with the monsoonal climate in Thailand. Additionally, we identified crAssphage, a marker of human sewage contamination, exhibited strong correlations with the more abundant ARGs, implying that human waste contributes significantly to the environmental burden of ARGs. The results of this research highlight the widespread nature of ARGs in water systems and the need for improved treatment and sanitation strategies to mitigate the public health threat posed by antimicrobial resistance. © 2024, The Authors. All rights reserved.

关键词： Effluents

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Utilization plastic waste using pyrolysis fixed bed 1

Utilization plastic waste using pyrolysis fixed bed

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1st International Conference on Design, Energy, Materials and Manufacture, ICDEMM 2018

作者： Swamardika, I.B.A. Winaya, I.N.S. Hartati, R.S. Study Program of Electrical Engineering Faculty of Engineering University of Udayana Indonesia Study Program of Mechanical Engineering Faculty of Engineering University of Udayana Indonesia

This investigative research aims to convert urban non-organic waste fuels such as plastic waste into energy using fixed bed pyrolysis technology. Pyrolysis fixed bed (PFB) is one of the most efficient technologies for converting various types of undegradable solid waste into thermal energy and liquid fuels with high efficiency. The study was conducted on a lab-scale PFB reactor with dimensions of 15 cm and 55 cm in diameter and bed height respectively. The reactor is equipped with a cooling and decomposition system to accommodate liquid and gas products. Reactor temperature variations using an external heater were tested and quartz sands were selected as a bed material to improve the temperature function of the PFB reactor so as the maximum quality and quantity of liquid product were obtained. The fuel properties of the derived oil were tested including their physical properties, calorific value, elemental measurement (CHNOS) analysis. The results of the study showed that the increase in temperature resulted in an increased pyrolysis performance which was indicated by the increased volume and liquid caloric value. © Published under licence by IOP Publishing Ltd.

关键词： Pyrolysis

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Characteristics of microwave-assisted pyrolysis of palm kernel shell

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AIP Conference Proceedings 2023年第1期2837卷

作者： Novi Caroko Harwin Saptoadi Tri Agung Rohmat Mechanical Engineering Study Program Engineering Faculty Universitas Muhammadiyah Yogyakarta Jalan Brawijaya Tamantirta Bantul Yogyakarta 55163 Indonesia Mechanical Engineering Study Program Engineering Faculty Universitas Gadjah Mada Jalan Grafika No. 2 Yogyakarta 55281 Indonesia

The research aims to investigate the kinetic characteristic of microwave-assisted pyrolysis of palm kernel shells using microwave output power (800, 600, 450, and 300 watts). The research consists of three steps; thermogravimetry analysis, microwave-assisted pyrolysis, and kinetic study analysis. This research showed that increased output power affected the decreasing activated energy, increased heating rate, and accelerated pyrolysis. The findings showed that microwave output power significantly affected kinetic characteristics and the production yield of microwave-assisted pyrolysis. Microwave-assisted pyrolysis ran optimally at 800, 600, and 450 watts but had not yet entirely run at 300 watts. The shells produced high solid products because they had a high lignin content (38.76 wt.%). The shell had a volatile matter content of 67.84 wt. %. Analysis using GC-MS showed that the liquid product contains an aromatic compound which was acetic acid and phenol.

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