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The enhancement of phycocyanin yield and purity from Spirulina platensis using freeze-thawing method on various solvents

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AIP Conference Proceedings 2021年第1期2344卷

作者： Dianursanti Maulina Aini Hafidzah Bioprocess Engineering Study Program Department of Chemical Engineering Faculty of Engineering Universitas Indonesia. Kampus UI Depok West Java 16424 Indonesia

Phycocyanin is a pigment compound that can be found from Spirulina platensis microalgae. It has been used for food colorant, cosmetic dye and fluorescence reagent for clinical diagnosis. Phycocyanin can be extracted using various procedure that was affected by many factors, one of them is the type of solvent that was used in the extraction process. This research will study the usage of different solvents, using sodium phosphate buffer and calcium chloride. The extraction method used in this research is freeze-thawing. The parameters of this extraction are phycocyanin yield and purity. The obtained result shows a higher yield of phycocyanin from extraction using phosphate buffer, with the value of 35.31 mg/g, and a higher phycocyanin purity from extraction using CaCl2 with the ratio of 2.6.

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Design strategies and willingness to pay for circular economy service policies in sustainable tourism

Environmental Challenges

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Environmental Challenges 2025年 18卷

作者： Suhardono, Sapta Phan, Thi Thanh Thuy Lee, Chun-Hung Suryawan, I Wayan Koko Environmental Sciences Study Program Faculty of Mathematics and Natural Sciences Universitas Sebelas Maret Surakarta 57126 Indonesia Faculty of Natural Resources & Environment Dong Nai Campus Vietnam National University of Forestry Bien Hoa Dong Nai 810000 Viet Nam Department of Natural Resources and Environmental Studies College of Environmental Studies and Oceanography National Dong Hwa University Taiwan Hualien 97401 Taiwan Department of Environmental Engineering Faculty of Infrastructure Planning Universitas Pertamina Jalan Sinabung II Jakarta Terusan Simprug 12220 Indonesia Center for Environmental Solution (CVISION) Universitas Pertamina Jalan Sinabung II Terusan Simprug Jakarta 12220 Indonesia Center for Interdisciplinary Research on Ecology and Sustainability College of Environmental Studies and Oceanography National Dong Hwa University Taiwan Hualien 97401 Taiwan

The transition towards a circular economy within the tourism industry is increasingly seen as essential to achieving sustainable development goals. This study explores the relationships between various design strategies, tourists' willingness to pay (WTP) for sustainable practices, and their participation in circular economy activities. Using Structural Equation Modeling (SEM) to analyze data collected from 640 tourists in Bali, the research identifies the critical factors that influence tourists' engagement with sustainability. The findings reveal that design strategies focused on longevity, serviceability, reusability, and material recovery significantly enhance WTP for sustainable practices. In turn, WTP is shown to be a key driver of participation in circular economy activities, such as purchasing recycled items and green purchasing behaviors. However, barriers such as cost concerns, lack of awareness, and limited incentives pose significant challenges to widespread adoption. © 2025 The Authors

关键词： Circular economy Design strategies Structural equation modeling Sustainable tourism Willingness to pay

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The potential of coffee waste composting technology using microbial activators to reduce solid waste in the coffee industry

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IOP Conference Series: Earth and Environmental Science 2021年第1期802卷

作者： N Amalia N F Widialip N Safira N Citrasari S Hariyanto Study Program of Environmental Engineering Department of Biology Faculty of Science and Technology Universitas Airlangga Indonesia Study Program of Biology Department of Biology Faculty of Science and Technology Universitas Airlangga Indonesia

The coffee industry in Sidoarjo produces coffee waste as coffee ground, coffee husk, and coffee return with the solid waste generation of about 5044.3 Tons/year. The coffee waste characters resemble organic waste, so it has potential as a composted raw material. This study aims to determine the selected variation raw material composition from the coffee industry based on Indonesian National Standard (SNI) Number 10-7030-2004 and the recycle potency of the coffee industry solid waste using composting technology. The research variables are the modified composting method (open windrow composting and Bacary Italian) and the co-composting method. The result of this research for all treatments showed that the concentration range of pH value 6.92-9.54, moisture 34.78-66.60%, C-organic 17.75-33.82%, N 1.45-2.93%, C/N ratio 10-13, P2O5 0.13-0.31%, and K2O 0.89-2.89%. The selected variation raw material composition of bio compost based on the compliance to SNI 10-7030-2004, which is 1.5 kg coffee ground + 1.35 coffee return + 0.15 kg coffee husk + 3 mL EM4 (K10). Based on K10 as the selected variation raw material composition of bio compost, the coffee industry solid waste recyclable is coffee ground 0.64%, coffee husk 0.20% and returned coffee 100%.

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Building data centers using Network Attached Storage (NAS) and Microprocessor Operating Systems

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IOP Conference Series: Materials Science and engineering 2021年第1期1088卷

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

Computer Laboratory of the University of Technology Sumbawa still does not have a Data Center, in the process of learning and teaching experiencing several obstacles one of which is the difficulty in sharing files between computers. The research objective is to build a Data Center at the Computer Laboratory of the University of Technology Sumbawa with the aim of facilitating practicum participants in sharing files between computer system devices. The method used in this research is the network development method Prepare, Plan, design, Implement, Operate, Optimize (PPDIOO). The results of NAS tests on different devices give results that are file access connections via wireless and LAN can run well and by producing Data Centers at the Computer Laboratory of the University of Technology Sumbawa can facilitate the process of storing cheap and efficient data.

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Circular economy of bio compost from coffee waste to support sustainable development goals in alleviating poverty in communities around the Sidoarjo coffee industry

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IOP Conference Series: Earth and Environmental Science 2021年第1期802卷

作者： K A Bimantara S F N Alauddin N Amalia N F Widialip N Citrasari S Hariyanto Program Study of Environmental Engineering Department of Biology Faculty of Science and Technology Universitas Airlangga Indonesia Program Study of Biology Department of Biology Faculty of Science and Technology Universitas Airlangga Indonesia

In 2016-2021, coffee consumption in Indonesia was predicted to increase by 120,000 tons, impacting the increase of coffee waste. Several large coffee industries in Indonesia are located in Taman District, Sidoarjo Regency. The character of the coffee skin waste contains 44.87% organic C; N of 1.69%; P of 0.18%; K 2.49%, and C / N ratio 10-14. This value indicates that the waste can be used as compost because it meets the criteria in SNI 19-7030-2004 concerning Compost from Organic Waste. This narrative review aims to determine the circular economy of bio compost from the coffee industry solid waste to support SDGs point 1 in alleviating poverty in communities around the Sidoarjo coffee industry. The research results showed bio compost I and II is the alternative product in the circular economy (W11). The coffee waste, coffee ground, coffee skin, and coffee returned collects waste in the circular economy (W10). The raw material composition of Bio compost I such as 1.5 kg coffee ground: 1.35 kg of coffee returned:0.15 kg coffee skin+3mL of EM4 and Bio compost II such as 4.6 kg SCG's:0. 4 kg coffee skin+5 ml EM4. In practice, the circular economy of bio compost I and II can involve Farmer Groups or Youth Organizations around the industry in Taman District, Sidoarjo Regency. Based on data 2020, the total members are 113 people, producing compost of 72,435.5 kg/month with a sales profit of IDR 36,217,750. This practice can support the first point of the SDGs, namely poverty alleviation for communities around the coffee industry. However, studies on the exact circular economy pattern of coffee waste in the Sidoarjo Regency are still needed.

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Monitoring System for Organic Fertilizer Plant Controller Using Solar Energy

Monitoring System for Organic Fertilizer Plant Controller Us...

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International Conference on Science and Innovated engineering 2018, i-COSINE 2018

作者： Mardiyanto, Arief Syamsul Azhar Electronics Study Program Faculty of Electrical Engineering Politeknik Negeri Lhokseumawe Jln. B.Aceh Medan Km.280 Buketrata24301 Indonesia

In this applied research, a solar energy powered process control monitoring system of inorganic fertilizer plant with capacity of 300 liters has been developed. The process control system consists of PLC with solar energy panel as its power source and a monitoring process system. The monitoring process system includes a Raspberry Pi minicomputer, an LCD touchscreen, level shifter converters, Arduino Nano, RS485 modules, four analog sensors, and one digital sensor. This system works by collecting temperature, humidity, and gas concentrations data and controlling the heater, exhaust fan, and aerator to maintain desired processing ***-22 digital sensor measures temperature and humidity, pH probe analog sensor measures pH values, MQ-4, MQ-7 and MiCS-2714 measures methane, carbon monoxide, and nitrogen dioxide gases respectively. Analog output sensor is read by PLC's analog to digital converter while digital output sensor is read by 1-wire bus by Arduino. The collected data is send over RS485 to Raspberry Pi. The plant temperature is set constant at 40°C. The heater is turned on at temperature of ≤ 38°C, when temperature reach ≤ 42°C the aerator, exhaust fan, and mixer will be on and will be switched off all together at 40°C. The temperature, humidity and PH are set as the reference of the control process. © Published under licence by IOP Publishing Ltd.

关键词： Solar energy

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Spatial distribution of soil water content in potato horizontal-ridge profile under various ridge dimensions 2

Spatial distribution of soil water content in potato horizon...

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2nd International Conference on Life and Applied Sciences for Sustainable Rural Development, ICLAS-SURE 2019

作者： Wijaya, Krissandi Hari Kuncoro, Purwoko Ardiansyah Arsil, Poppy Ary Ani, Hilda Study Program of Agricultural Engineering Department of Agricultural Technology Faculty of Agriculture Jenderal Soedirman University Jl. Dr. Soeparno Karangwangkal Purwokerto53123 Indonesia

Vertical (slopping)-ridge is generally applied to cultivate potato crop in tropical highland area with intensive use of non-organic fertilizer, by which the soil erosion as well as environmental degradation might be significantly accelerated. On the other hand, horizontal (contour)-ridge has been very effective to reduce the soil erosion in potato cropping field, but yet slightly ineffective to support the optimal crop production, due to the waterlogging in the ridge profile. Dimension of the horizontal-ridge is expected to affect water distribution as well as the waterlogged condition, on which a specific study need to be focused, in order to develop an appropriate drainage system on the ridge. This study was aimed to characterize the spatial distribution of soil water in the horizontal-ridge profile under various ridge dimensions. Totally 9-potato-plots of 300 x 300 cm2 with 5% slope were prepared in Serang village, Purbalingga with various dimensions and replications of the horizontal ridges: 30 x 30 x 30 cm3 (G30), 30 x 40 x 30 cm3 (G40), and 30 x 50 x 30 cm3 (G50). Of each plot, the dielectrically (volumetric)-water content of the horizontal-ridge soil within the grid of 80 x 80 cm2 at the depth of 5, 10, and 20 cm were measured every months using EC5 moisture sensors and EM50 data logger, and then averaged. Based on the given grid, the data were plotted in contour pattern and were then analysed using semivariogram (Gstat and GNUplot) to characterize the spatial distribution and variability, respectively. The results showed that the spatial distribution of dielectrically (volumetric)-water contents tended to be inter-correlated within each ridge dimension, and the data were increased with soil depth and ridge dimension increment. Accordingly, the data were spatially-correlated with sill (C, semivariance) ranged from 0.00084-0.00429 cm3 cm-3 and range of influence (a) ranged from 0.624-2.809 m, in which the G50 had most representative and stable trend of the spa

关键词： Crops

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Implementation of cart Algorithm for Monitoring System and Prediction of Electric Power use of IOT-Based Household Equipment

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Journal of Physics: Conference Series 2020年第3期1477卷

作者： Pritasari Palupiningsih Budi Prayitno Informatic Engineering Study Program Sekolah Tinggi Teknik PLN Jakarta Indonesia

PLN customer power consumption from the household sector is quite large, originating from the use of household appliances, such as refrigerators, televisions, dispensers, lamps and air conditioners. When users feel that their electricity usage is wasteful, they do not know in detail which household electrical appliances consume the most electricity. At this time customers still find it difficult to monitor the power usage of every household electrical appliance. So it is not known which equipment consumes large amounts of electrical energy. For this reason, a monitoring system for household electrical power usage is needed. This system can be used by PLN household sector customers to find out which household appliances use large power, so customers can manage the use of household appliances. To do this monitoring, a wattmeter device is needed that is able to measure the power use of household electronic equipment. The results of this measurement are measured current data through the current sensor. So that monitoring can be done through the system in real time, the measurement data is sent to the monitoring system database server via the internet of things (IoT) devices. Data generated from the monitoring system can be analyzed using prediction techniques, to obtain information about the length of time the availability of electrical energy has been purchased by the customer. One algorithm that can be used to predict the use of household electrical power is the CART algorithm. This research aims to build a monitoring system for power usage for each IoT -based household appliances. This research aims to build a monitoring system for power usage for each IoT-based household appliances. The second objective of this research is to apply CART algorithm to predict the power usage of household appliances.

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Thermomagnetic anomalies in quantum magnon transport caused by tunable junction geometries in cold atomic systems

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Physical Review A 2025年第3期111卷 033312-033312页

作者： Yuta Sekino Yuya Ominato Hiroyuki Tajima Shun Uchino Mamoru Matsuo Interdisciplinary Theoretical and Mathematical Sciences Program RIKEN Wako Saitama 351-0198 Japan Nonequilibrium Quantum Statistical Mechanics RIKEN Hakubi Research Team RIKEN Cluster for Pioneering Research Wako Saitama 351-0198 Japan Waseda Institute for Advanced Study Waseda University Shinjuku-ku Tokyo 169-0051 Japan Department of Physics School of Science The University of Tokyo Tokyo 113-0033 Japan Faculty of Science and Engineering Waseda University Tokyo 169-8555 Japan Kavli Institute for Theoretical Sciences University of Chinese Academy of Sciences Beijing 100190 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China Advanced Science Research Center Japan Atomic Energy Agency Tokai 319-1195 Japan RIKEN Center for Emergent Matter Science Wako Saitama 351-0198 Japan

We study magnon-driven spin and heat transport in a magnetic linear junction (MLJ) formed by two ferromagnets in optical lattices linked via linearly aligned bonds. Using the Schwinger-Keldysh formalism, we uncover that under weak effective Zeeman fields, where Bose-Einstein statistics of magnons dominate, magnonic criticality dramatically enhances spin and thermal conductances. These singular transport properties depend on the junction geometry, and the transport properties qualitatively differ between the linear junction in this paper and the point contact in our previous work. The quantum-enhanced conductances result in the breakdown of the magnonic Wiedemann-Franz (WF) law. In the classical regime at temperatures much lower than magnon energy gaps, we find that a magnonic Lorenz number becomes independent of temperature yet dependent on junction geometry, sharply contrasting with the universal WF law for Fermi liquids. We also find that the interface geometry of the MLJ decouples spin and heat relaxations between ferromagnets with decay times insensitive to temperature and effective Zeeman fields. These dynamics reveal junction-geometry-sensitive magnon transport distinct from Fermi liquids, paving the way for new avenues in thermomagnetic research leveraging the tunability of cold atomic systems.

关键词： Fermi liquids

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Preparation of Superhydrophobic Zinc Oxide Nanorods Coating on Stainless Steel Via Chemical Bath Deposition 1

Preparation of Superhydrophobic Zinc Oxide Nanorods Coating ...

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1st International Conference on Design and Application of engineering Materials 2018, IC-DAEM 2018 in conjunction with 11th Seminar Nasional Metalurgi dan Material, SENAMM 2018

作者： Nuruddin, Ahmad Yuliarto, Brian Kurniasih, Santi Setiyanto, Henry Ramelan, Aditianto Engineering Physics Research Group Faculty of Industrial Technology Institut Teknologi Bandung Bandung40132 Indonesia Analytical Chemistry Research Group Faculty of Mathematics and Sciences Institut Teknologi Bandung Bandung40132 Indonesia Materials Engineering Study Program Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Jalan Ganesha 10 Bandung40132 Indonesia

The stearic acid modified zinc oxide nanorod surface was coated with a stainless steel substrate to improve the contact angle and the sliding angle. Facilitated through ZnO seeding on the substrate, the ZnO nanorod was deposited via chemical bath deposition at different precursor concentrations. The surface hydrophobicity was modified by varying concentrations of stearic acid at and submmersion time. The contact angle was investigated in relation to the surface microstructure and modification. Results indicate that the density of ZnO nanorods on the substrate surface and stearic acid coverage are prerequisites for improving surface hydrophobicity. Superhydrophobic properties with a contact angle of 162° was obtained for ZnO deposited with 35 mM zinc nitrate and submerged in 8 mM stearic acid for 36 h, which allowed 5 μL water droplets to slide at 3.8°. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Stainless steel

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