| 1. |
- Abadi, Imam, et al.
(författare)
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Design of Adaptive Neuro-Fuzzy Inference Control Based One-Axis Solar Tracker on Battery Charging System
- 2020
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Ingår i: E3S Web of Conferences. - : EDP Sciences. - 2267-1242. ; , s. 1-15
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Konferensbidrag (refereegranskat)abstract
- The photovoltaic (PV) panel can produce electrical energy that is very environmentally friendly and easy to use. The use of PV panels is suitable for supplying peak loads or at night using batteries as energy storage. However, the battery needs to manage for control, and the battery can last long. The solution to battery management problems is through research about the battery charging system. The DC-DC converter used is the Single Ended Primary Inductance Converter (SEPIC) type. Voltage Control of the battery charging using Adaptive Neuro-Fuzzy Inference System (ANFIS). In the simulation of bright conditions, ANFIS controls can track the charging point set point and obtain a voltage response with a rise time of 0.0028 s, a maximum overshoot of 0.027 %, a peak time of 0.008 s, and a settling time of 0.0193 s. When charging a solar tracker, PV battery gets a 0.25 % increase compared to a fixed PV panel. PV solar tracker can follow the direction of the sun's position. The irradiation value and maximum temperature affect the input voltage and input current that enters the converter.
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| 2. |
- Abadi, Imam, et al.
(författare)
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Performance Study of Maximum Power Point Tracking (MPPT) Based on Type-2 Fuzzy Logic Controller on Active Dual Axis Solar Tracker
- 2020
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Ingår i: E3S Web of Conferences. - : EDP Sciences. - 2267-1242. ; , s. 1-16
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Konferensbidrag (refereegranskat)abstract
- World energy consumption increases with time, so that occur an energy imbalance. Many breakthroughs have developed to utilize renewable energy. The photovoltaic system is one of the easy-to-use renewable energies. The power conversion from PV fixed is still low, so the PV system is designed using the active dual-axis solar tracker. The PV tracker position can be adjusted to change the sun position to get maximum efficiency. The active dual-axis solar tracker system is integrated with the maximum power point tracking (MPPT) algorithm to keep PV operating at a maximum power point even though input variations change. The active dual-axis solar tracker system integrated with the maximum power point tracking (MPPT) algorithm to keep PV operating at a maximum power point even though input variations change. Tracking test simulation had done by comparing the output power of a fixed PV system with the active dual-axis solar tracker. Type-2 fuzzy logic based MPPT successfully increased the average output power by 10.48 % with the highest increase of 17.48 % obtained at 15:00 West Indonesia Time (GMT+7). The difference in power from a fixed PV system with the active dual-axis solar tracker of 36.08 W is from the output power worth 206.3 to 242.4 W.
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| 3. |
- Alam, Sultan, et al.
(författare)
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Adsorption Kinetics and Isotherm Study of Basic Red 5 on Synthesized Silica Monolith Particles
- 2021
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Ingår i: Water. - : MDPI. - 2073-4441. ; 13:20
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Tidskriftsartikel (refereegranskat)abstract
- The Silica monolith particles (SMP) were prepared from Tetra-Methyl-Ortho-Silicate (TMOS) and characterized by Fourier transforms infrared (FTIR), Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and surface area analyzer. FTIR analysis showed the Si-O stretching confirming SMP formation. SEM analysis provided information about the mean diameter of SMP (1-5 mu m). EDX confirmed the presence of silicon and oxygen in the SMP. Moreover, the calculated surface area for SMP was found to be around 367 m(2)/g, whereas BJH pore size distributed particles were 87.15 along with the total pore volume and pore radius of 0.073 cm(3)/g and 16.627 & ANGS;, respectively. Besides, the removal efficiency was found to be about 96%. Various kinetic equations were used to calculate the adsorption parameters. Overall, the results show that the most appropriate model for the kinetics data was the pseudo-second order kinetics model while the mechanism of adsorption was best explained by the Langmuir isotherm. The highest removal of Basic Red 5 dye after 120 min at 298 K was 576 mg/g. Moreover, the thermodynamics parameters (Enthalpy, Gibb's energy, and Entropy) were also estimated. The & UDelta;H & DEG; (0.995 kJ/mol) value depicted the endothermic nature of the process. The non-spontaneous aspect of the process was evident from the & UDelta;G & DEG; values which were 60.431, 328.93, and 339.5 kJ/mol at 293, 303, and 313 K, respectively. From the high removal efficiency value, it can be concluded that the prepared adsorbent can be a potential adsorbent in the reclamation of dyes from wastewater.
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| 4. |
- Ariadi, B. Y., et al.
(författare)
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Risk Analysis of Rice Farming at Volcano Semeru Area, Pronojiwo District, Lumajang Regency, Indonesia
- 2024
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Ingår i: BIO Web of Conferences. - : EDP Sciences.
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Konferensbidrag (refereegranskat)abstract
- This study aimed to analyze the production and financial risks of paddy rice farming in Pronojiwo district, Lumajang Regency, East Java, Indonesia. The research was conducted in March to May 2021, after the case of Semeru eruption in December 2020. The villages sample were Oro-Oro Ombo and Supiturang, the two most affected by the Mount Semeru lava flow. Primary data were obtained from the amount of 95 respondents chosen randomly. The risk of production and financial were analyzed by Coefficient of Variation (CV). Meanwhile, the factors affecting farm risk is analyzed by using regression method. The result of production risk on paddy rice farming in Pronojiwo, Lumajang Regency shows a low risk, namely indicated by CV of 35.38 %. However, the farm income risk is much higher, indicated by CV of 79.08 %. The factors affecting production risk is usage of chemical fertilizer. The increased number of chemical fertilizer will increase production risk of rice farming.
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| 5. |
- Basir, A., et al.
(författare)
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Proficiency in Informatics and Communication Technology Application to Improve Agricultural Counseling Performance in Luwu Regency, Indonesia
- 2023
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Ingår i: E3S Web Conf.. - : EDP Sciences.
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Konferensbidrag (refereegranskat)abstract
- Informatics and Communication Technology (ICT) provides relevant agricultural information, which is essential in agricultural development attempts, in timely fashion. Aiming to find out if it is able to improve the efficiency of agricultural counseling agents, this study examined agricultural counseling agents in Luwu Regency, South Sulawesi, Indonesia. As explanatory quantitative research, simple random sampling was applied to respondents of google form questionnaire and the data were analyzed as per Structural Equation Model (SEM) and supported by smart PLS application. The result came out with R2 value of 0.868, representing the agricultural counseling agent's proficiency and ICT application signified agricultural counseling agent's efficiency at 86.8 %. It is therefore conclusive that agricultural counseling agent's efficiency in extension activities relies on both their proficiency and ICT application.
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| 6. |
- Burlakovs, Juris, 1977-, et al.
(författare)
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Environmental Quality of Groundwater in Contaminated Areas—Challenges in Eastern Baltic Region
- 2020
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Ingår i: Water Resources Quality and Management in Baltic Sea Countries. - Switzerland : Springer. - 9783030397005 - 9783030397012 ; , s. 59-84
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Bokkapitel (refereegranskat)abstract
- The lack of water in the future will force society to find more sophisticated solutions for treatment and improvement of groundwater wherever it comes from. Contamination of soil and groundwater is a legacy of modern society, prevention of contaminants spread and secondary water reuse options shall be considered. The aim of the book chapter is to give oversight view on problems and challenges linked to groundwater quality in Eastern Baltic region whilst through case studies explaining the practical problems with groundwater monitoring, remediation and overall environmental quality analysis. The reader will get introduced with case studies in industry levels as credibility of scientific fundamentals is higher when practical solutions are shown. Eastern Baltic countries experience cover contamination problems that are mainly of historic origin due to former Soviet military and industrial policy implementation through decades. Short summaries for each case study are given and main conclusions provided in form of recommendations at the very end of the chapter.
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| 7. |
- Burlakovs, Juris, 1977-, et al.
(författare)
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Fluorescence Spectroscopy – Applied Tool for Organic Matter Analysis
- 2019
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Ingår i: <em>Goldschmidt Abstracts</em>, 2019.
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Konferensbidrag (refereegranskat)abstract
- Large applied projects in various sub-fields of environmental science studied and analyzed properties of organic matter. The “Life-Sure” is as continuation of started work for cost effective bottom sediments treatment where organic matter play important role of sorption of urban contaminants; “CONTRA” - beach wrack studies for advanced value-based bioeconomy development. Another project on Jurassic clay is interesting in discourse on Pleistocene glaciers glaciodynamics. Material from field was tested by 3D fluorescence excitation-emission matrix (EEM) providing “fingerprints” for a single compound or a mixture of fluorescent components. Thus humic macromolecules might be well seen nevertheless structural units have variable effects on the wavelength as well as intensity of fluorescence. It decreases with increasing molecular size of the humic macromolecule. For applied environmental projects this is well non-destructive tool to quantify the decomposition degree of organic matter requiring negligible amount of sample. This important method is valid for both organic matter and humic substances analytics. Chemical nature of humic substances can be correlated to structural information, e.g., functional groups, poly-condensation, aromaticity, dynamic properties related to intermolecular interactions. Acquired data from EEM provided significant input for scientific knowledge and innovation along with other analytical tools.
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| 8. |
- Burlakovs, Juris, 1977-, et al.
(författare)
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Gateway of Landfilled Plastic Waste Towards Circular Economy in Europe
- 2019
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Ingår i: Separations. - : MDPI. - 2297-8739. ; 6:2, s. 1-8
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Tidskriftsartikel (refereegranskat)abstract
- For decades, significant work has been conducted regarding plastic waste by dealing with rejected materials in waste masses through their accumulation, sorting and recycling. Important political and technical challenges are involved, especially with respect to landfilled waste. Plastic is popular and, notwithstanding decrease policies, it will remain a material widely used in most economic sectors. However, questions of plastic waste recycling in the contemporary world cannot be solved without knowing the material, which can be achieved by careful sampling, analysis and quantification. Plastic is heterogeneous, but usually all plastic waste is jointly handled for recycling and incineration. Separation before processing waste through the analytical approach must be applied. Modern landfill mining and site clean-up projects in contemporary waste management systems require comprehensive material studies ranging from the macro-characterization of waste masses to a more detailed analysis of hazardous constituents and properties from an energy calorific standpoint-where, among other methods, thermogravimetric research coupled with life cycle assessment (LCA) and economic assessment is highly welcomed.
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| 9. |
- Burlakovs, Juris, 1977-, et al.
(författare)
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Geophysical aspects of abandoned landfill geomorphological and material properties macro-characterization
- 2020
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Ingår i: International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM. - : International Multidisciplinary Scientific Geoconference. - 9786197603057 ; , s. 551-558
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Konferensbidrag (refereegranskat)abstract
- Landfills (dumps) are places where the end of the life cycle of products can be found - useful material is dumped away from the sight creating contaminant flows around. Another problem is huge unexplored potential of resources recycling - we have limited knowledge also on useful elements and materials that are buried. The solution to overcome the limitations that provide remote sensing and traditional geodesy, proximal sensing techniques could be used. “Near surface geophysics” with operation at or just below the soil surface, significantly may contribute to give answers that traditionally are solved only after excavation. Geophysical methods are various, those can be active (i.e. create its own signal) or passive (i.e. register an existing signal); invasive (by inserting devices into the soil) or non-destructive. Some of these methods are static (e.g. a sequence of inserted electrodes), others can be used in a mobile way (e.g. pulled by a quad-bike). In general, their depth of exploration can vary from a few decimetres to some tens of metres. Thus in range of wide geophysical methodology spectrum almost all methods might be of use for unknown dump exploration depending on circumstances. In this paper, the aim is to macro-characterize anthropogenic geomorphological forms for contouring of old buried dumps by use of magnetometry, and geoelectric research methods to provide knowledge on approximate content of the dump. Protonmagnetometer was used in Eastern Latvia to determine unseen on surface dumpsite, buried in forest; induced polarisation and electric resistivity research was done in Southern Sweden for the macro-content analysis of dump hills composed of glass industry residuals and construction waste mixture. Geophysical surveying was performed to support site investigation with respect to landfill-related environmental problems, to enhance the opportunity for contouring of location of material mass and initially evaluate its physical properties. Results have shown good potential of geophysical surveying to spatially characterize landfill masses (location and dimensions) and to identify the internal structure of a landfill site, which already provides valuable information to estimate the landfill mining (material recovery) potential of landfills.
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| 10. |
- Burlakovs, Juris, 1977-, et al.
(författare)
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Ground-penetrating Radar (GPR) Geoenvironmental Screening in Lakes of Latvia - Challenges and Outcomes
- 2016
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Konferensbidrag (refereegranskat)abstract
- Geophysical studies in mapping and geoenvironmental applications for screening purposes are widely applied in Latvia. Ground-penetrating radar (GPR) as the one method from geophysical toolbox is a non-invasive and non-destructive way where pulsed electromagnetic signal is recorded as scattering from subsurface objects. Aim of two described screening studies was to analyse potential advantages of GPR use for mapping bottom sediments and topography in two lakes and pinpoint challenges to overcome during works. Both lakes are relatively deep and of sub-glacial origin that became lakes after the ice retreat from Baltic region. Characterization of bottom sediments as well as full core description of upper limnic layers for comparison with GPR signals were performed. Major results show that GPR, coring and laboratory analysis can be used simultaneously, however, ground penetration radar sometimes fails to recognize full picture needed for geoenvironmental application needs. Proper treatment of data nevertheless diminish the necessity of dense coring in lakes when budgets are strict.
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