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Monitoring of water quality and plankton composition in Porong Estuary, Sidoarjo

AIP Conference Proceedings 2025年第1期3186卷

作者： Uun Yanuhar Muhammad Musa Heru Suryanto Nur Sakinah Junirahma Nico Rahman Caesar Aquatic Resources Management Faculty of Fisheries and Marine Sciences Brawijaya University Malang Jl. Veteran Malang 65145 Indonesia Department of Mechanical Engineering Faculty of Engineering Universitas Negeri Malang Malang 65145 Indonesia Master Program of Aquaculture Faculty of Fisheries and Marine Science University of Brawijaya Jl. Veteran Malang 65145 Indonesia Doctoral program of Environmental Science Postgraduate Program University of Brawijaya Jl. Veteran Malang 65145 Indonesia

Disposal of Lapindo mud which carries nutrients and other dissolved organic matter into the Porong estuary, can cause the death of aquatic organisms due to high contamination and disturbance of aquatic ecosystems. The presence of phytoplankton can explain the current condition of the Porong Estuary. The purpose of this study was to report the water quality and plankton composition of the Porong estuary. The method used in this study is a descriptive survey method. Determination of sampling points using the appropriate sampling method at three stations. The research variables observed included water quality parameters such as temperature, total dissolved solids (TDS), total suspended solids (TSS), total organic matter (TOM), pH, dissolved oxygen (DO), carbon dioxide (CO2), biological oxygen demand (BOD), nitrate, ammonia, orthophosphate, salinity and observations of phytoplankton in water bodies. The water quality values at stations 1, 2, and 3 respectively for TSS, pH, DO, BOD, TOM, nitrate, ammonia, orthophosphate shows a less than optimal value. Water conditions based on plankton abundance 24,678 cells/mL, 44,904 cells/mL, 18,312 cells/mL were eutrophic. The average of water quality parameters classified as less than optimal. Relatively, station 1 is the station with the best conditions between stations 2 and 3.

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An alternative model of retaining walls on sandy area to prevent landslides 4

An alternative model of retaining walls on sandy area to pre...

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4th International Conference on Earthquake engineering and Disaster Mitigation, ICEEDM 2019

作者： Mazni, Deni Irda Doctoral Program Dept. of Civil Eng. Faculty of Engineering Andalas University Indonesia Civil Engineering Study Program Universitas Dharma Andalas Indonesia

Landslide is one of the potential disasters that can take life and material. A way to reduce disaster risk in slopes is to improve slope stability. A challenge in improving slope stability is how to make soil retaining walls that are simple, quickly built, and workable in the process. This research focuses on laboratory tests of gravity, segmental, and pre-cast retaining walls in sands. The tested models are slopes with different segmental, pre-cast, gravity walls made of un-reinforced concrete for static loads. The slope failure patterns were observed with their load variations. There are two wall models segmental. Each segmental wall observed a collapse pattern that occurred behind the wall. Static loading is carried out step by step until collapse occurs in the segmental wall. Observations and defects are carried out during the load process until the segmental wall collapses. This research shows that segmental pre-cast retaining walls with specific models and sizes can be selected to support certainly given loads to prevent slope failure. © 2020 The Authors, published by EDP Sciences.

关键词： Landslides

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Development of hazelnut shell-derived biochar to support a bifunctional MoCo electrocatalyst for HER/OER in alkaline medium

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Biochar 2025年第1期7卷 1-18页

作者： Ñanculeo, Jaime Andreu, Teresa Sirés, Ignasi Ramírez, Andrés Cea, Mara Nahuelcura, Benjamín Valenzuela, Gerson Garrido-Miranda, Karla González, María Eugenia Doctoral Program in Engineering Sciences with Specialization in Bioprocesses University of La Frontera Av. Francisco Salazar 01145 Temuco Chile Departament de Ciència de Materials i Química Física Secció de Química Física Facultat de Química Universitat de Barcelona Martí i Franquès 1-11 Barcelona 08028 Spain Department of Chemical Sciences and Natural Resources Faculty of Engineering and Sciences University of La Frontera Av. Francisco Salazar 01145 Temuco 4780000 Chile Department of Chemical Engineering University of La Frontera Av. Francisco Salazar 01145 Temuco 4780000 Chile Scientific and Technological Bioresource Nucleus (BIOREN-UFRO) Universidad de La Frontera Av. Francisco Salazar 01145 Temuco 4780000 Chile

Hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), the two concurrent reactions for the electrolytic production of green H2, require low-cost and sustainable electrocatalysts for their scale-up, as... 详细信息

Hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), the two concurrent reactions for the electrolytic production of green H₂, require low-cost and sustainable electrocatalysts for their scale-up, as for example non-noble metals and carbonaceous structures with high surface area. Our hypothesis is that the activated-doped biochar decorated with Mo and Co provides high porosity and active site dispersion, enhancing HER and OER kinetics with low overpotentials and high stability in an alkaline medium. Here, a bifunctional Mo/Co electrocatalyst supported on N-doped biochar obtained from hazelnut shells has been developed, thus valorizing an agro-industrial residue of major importance in Chile. The activated biochar matrix, with interconnected hierarchical pores, offered a high surface area of 1102 m² g⁻¹ and I_D/I_G = 1.08 graphitization, while N-doping was observed by XPS, with the formation of N-pyridinic and N-graphitic functionalities that improved the catalytic performance. The addition of metals to the substrate allowed the formation of bimetallic Mo/Co active sites (Co₆Mo₆C), increasing the graphitization degree and improved the growth of these bimetallic sites. The electrocatalytic performance in the presence of the metals was good, revealing low overpotentials for HER (0.257 V) and OER (0.370 V) with low Tafel slopes (51 and 59 mV dec⁻¹, respectively) under alkaline conditions, also improving the electron transfer and stability. © The Author(s) 2025.

关键词： Bifunctional Biochar Electrocatalysts Green H2

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Study of stinging nettle fibers as a reinforcing of composite materials based on its growing region 1

Study of stinging nettle fibers as a reinforcing of composit...

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

作者： Suryawan, I.G.P.A. Suardana, N.P.G. Winaya, I.N.S. Suyasa, I.W.B. Lokantara, I.P. Department of Mechanical Engineering Udayana University Kampus Bukit Jimbaran Bali Indonesia Doctoral Program of Enviromental Science Udayana University Bali Denpasar Indonesia Doctoral Program of Engineering Science Udayana University Bali Denpasar Indonesia

Stinging nettle is a perennial herbaceous plant belonging to the Urticaceae family, In Bali Indonesia called jelatang. This species is considered a weed in intensive agriculture as its fast vegetative growth and high densities enable increased spread and soil coverage. In Tabanan Bali Indonesia several places to grow are in Denbantas altitude 200-500 meters and in Bedugul altitude 1000 -1500 meters above sea level. Nettle fibers are natural fibers that can be utilized as reinforcement for composite materials. Natural fibers have been used worldwide as a potential replacement for glass fiber reinforced composites, over the last few years has been applied in the automotive sector, aircraft interior and interior of the building. Properties of the natural fiber is lighter, easier to handle, not abrasive, and low cost. The objective of this study was to compare the composition and the tensile strength of the fiber nettle based growing areas from Bedugul and Denbantas. The method used is a fiber tensile test equipment, fourier transformer infrared red (FTIR), thermo-gravimetric analysis (TGA) and scanning electron microscope (SEM). From the research of nettle fibers that stinging nettle from Denbantas has a better tensile strength than Bedugul nettle. The TGA test the visible fiber from Denbantas is superior when used as a composite reinforcement. © Published under licence by IOP Publishing Ltd.

关键词： Scanning electron microscopy

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Alternative foundation for reducing building losses due to foundation failure in soft soil 4

Alternative foundation for reducing building losses due to f...

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4th International Conference on Earthquake engineering and Disaster Mitigation, ICEEDM 2019

作者： Srihandayani, Susy Doctoral Program Departement of Civil Eng. Engineering Faculty Andalas University Indonesia Civil Engineering Study Program Sekolah Tinggi Teknologi Dumai Riau Indonesia

Much damage to buildings occurs in areas that have soft soil layers due to the failure of the foundations. Besides, foundations in soft soils generally require very expensive construction. For this reason, proper research needs to help develop strong foundations that can be used on soft soils with relatively low cost. In this research, foundations with various diameters and depths were tested on soft soil. The foundations were made of PVC pipes with diameters of ½ ", 1", 2 " or 2.5" and the same depth. Soft soil in the form of clay with particle-sizes that passed filter No. 200 was used. Before testing the foundations, carrying capacity analysis was done using the classical method on each pipe with a closed head so that the optimum carrying capacity of each foundation (PVC Pipe) was known. From this test the influence of the size of the foundations on the carrying capacity of soft soil could be seen. The results of this research will help reduce building loss/damage in areas dominated by soft topsoil © 2020 The Authors, published by EDP Sciences.

关键词： Foundations

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Logit Model for Transportation Mode Choice in Berau Regency East Kalimantan 3

Logit Model for Transportation Mode Choice in Berau Regency ...

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3rd International Conference on Science and Technology 2019, ICST 2019

作者： Agustaniah, Rosa Wicaksono, Achmad Doctoral Program of Civil Engineering Universitas Brawijaya Malang Indonesia Universitas Brawijaya Malang Indonesia

In big cities thousands of public transportation is very easy to find because it fills the streets and can cause traffic jams. Another case that occurred in Berau District, public transportation was almost non-existent. On the streets private vehicles and transport companies dominate. The number of public transport fleets such as city transportation and buses, is very small in number. Berau Regency has many attractions, but tourists will find it difficult to find public transportation. This study aims to determine the selection of transportation mode choice in Berau Regency using the logit model with the assumed road users choose to use public transport or private transportation. Travel attributes that influence mode choice in Berau district are travel time, transportation costs, space availability, comfort and safety. The cost of private transportation is the same as the cost of public transportation, which is about 79% of people who will still choose to use private transportation. This condition will be achieved if the cost of public transportation is 1.4 times cheaper than the cost of private transportation. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Travel time

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The potential utilization of natural materials as a wall covering of the building in heat reduction 8

The potential utilization of natural materials as a wall cov...

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8th Annual International Conference 2018 on Science and engineering, AIC-SE 2018

作者： Jeumpa, K. Doctoral Study Program of Technology and Vocational Education Faculty of Engineering Padang State University Indonesia

This paper aims to examine the potential of natural coco fibre to be utilized as a wall covering in building construction for sun radiation protection. engineering innovation in building construction to control the building's temperature is important. Lowering the building's room temperature can be carried out by modifying the wall construction materials. Thus, the usage of an air conditioner which is not environmentally friendly can be reduced. The wall modification can give more protection and dampen the sun's heat, hence the thermal comfort can be obtained. Natural materials, moreover, can be used in the wall modification to reduce the room temperature. In this study, a comparative analysis was carried out between two materials: (1) the coco fibre coated with cement mixture;(2) the mixture of cement and sand, both were used as materials to plaster the wall. The cement mixture acted to bind the compacted coco fibre sheets. The material was evaluated after the cement mixture had been hardened. The test was carried out by providing heat on one side and measuring the temperature on the other side of the material. The results were significant between the two materials. This indicates the potential of coco fibre as a heat insulation in the wall construction materials that can minimize solar thermal radiation into the room. © Published under licence by IOP Publishing Ltd.

关键词： Room temperature

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Pyrolysis study of coconut leaf's biomass using thermogravimetric analysis 1

Pyrolysis study of coconut leaf's biomass using thermogravim...

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

作者： Rajendra, I.M. Winaya, I.N.S. Ghurri, A. Wirawan, I.K.G. Study Program of Doctoral Engineering Sciences Faculty of Engineering University of Udayana Indonesia Study Program of Mechanical Engineering Faculty of Engineering University of Udayana Indonesia Mechanical Engineering Department Bali State Polytechnic Indonesia

Coconut leaf is one of the most potential biomass to be converted into bio-oil through pyrolysis process and the availability in Indonesia is abundance. The mechanism of decomposition of coconut leaf into bio-oil productions requires further research because of the complexity of pyrolysis and differences in biomass composition. Therefore, the design, optimization and modeling of pyrolysis processes is strongly influenced by biomass characteristics. The purpose of this study was to find the characteristic differences in pyrolysis behavior of the three main parts of coconut leaf based on its constituent parts;leaflets, midrib and whole leaf. Moisture is removed by drying the sample in an electric oven at 110°C for 24 hours. Characteristics were tested using Cellulose Analysis, Ultimate Analysis, and Heat Value, whereas pyrolysis behavior used Thermogravimetric Analyzer (TGA). The results show that leaflets, midrib and whole leaf exhibit different pyrolysis behavior. In terms of considering flow process of separation, the whole leaf becomes an option as a fuel for further pyrolysis processes. The maximum temperature that as a reference in the pyrolysis process of coconut leaves is 500°C with temperature rate of 20°C/min and the process lasts as long for 130 minutes. © Published under licence by IOP Publishing Ltd.

关键词： Pyrolysis

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Sensing the world:: Challenges on WSNs

Sensing the world:: Challenges on WSNs

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IEEE International Conference on Automation, Quality and Testing, Robotics (AQTR 2008)

作者： Rocha, Valter Goncalves, Gil Agilus I+D PRODEI - Doctoral Program in Informatics Engineering Faculty of Engineering of the University of Porto Informatics Engineering Department Faculty of Engineering of the University of Porto

ISBN: (纸本)9781424425761

Wireless sensor network (WSNs) is a demanding multidisciplinary field that has been target of research in the last decade. The increasing demand for security and automated monitoring of things and places makes WSNs a promising technology although there are still many open research contributions needed to make this the standard of environmental sensing. The goal of this article is to identify the research challenges on WSNs by dividing them into functional groups, building on previous work. We followed a structured approach based on a simplified yet complete vision of a design space for WSNs. Moreover, this work aims to identify research gaps and investigation fields yet unexplored or hardly explored by researchers in order to plot paths for future research. Several challenges and research areas were identified, like Models for Sensor Networks, Benchmarking Methodologies, Distributed Processing, Interface WSNs and Network Reprogramming. Some of these challenges will become even clearer as increasingly WSNs become Wireless Sensor and Actuator Networks (WSANs).

关键词： wireless sensor networks, WSN pervasive computing mesh networking

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Preparing future entrepreneurs: reflections about the COVID-19 impacts on the entrepreneurial potential of Brazilian students

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Journal of Work-Applied Management 2021年第2期13卷 277-283页

作者： Cazeri, Gustavo T. Anholon, Rosley Rampasso, Izabela Simon Quelhas, Osvaldo L.G. Leal Filho, Walter School of Mechanical Engineering State University of Campinas Campinas Brazil PNPD/CAPES Program Doctoral Program in Sustainable Management Systems Federal Fluminense University Niterói Brazil Master Program in Management Systems Doctoral Program in Sustainable Management Systems Federal Fluminense University Niterói Brazil Faculty of Life Sciences Hamburg University of Applied Sciences Hamburg Germany

Purpose: This viewpoint aims to present reflections on the coronavirus disease 2019 (COVID-19) pandemic scenario and the entrepreneurial potential of Brazilian students. Guidelines are proposed to support debates in the academic environment and better prepare future entrepreneurs to the labour market. Design/methodology/approach: Since this is a viewpoint article, some statements presented here are characterised by the authors' opinions. However, for a better foundation, bibliographic research related to the theme was carried out. Findings: In the authors' point of view, the COVID-19 pandemic scenario may negatively influence the decisions of Brazilian students that are characterised as potential future entrepreneurs. Educators can use the guidelines presented here to conduct debates with students in order to clarify aspects related to profile, behaviour and other issues. Originality/value: By understanding better entrepreneurial aspects in the COVID-19 pandemic scenario, Brazilian students can make better decisions. This initiative will contribute to future success in the Brazilian entrepreneurial activity and national economy. © 2021, Gustavo T. Cazeri, Rosley Anholon, Izabela Simon Rampasso, Osvaldo L.G. Quelhas and Walter Leal Filho.

关键词： Brazilian higher education institutions COVID-19 pandemic Entrepreneurial activity Labour market

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