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Journal articles on the topic 'SUB-GRIDS'

Author: Grafiati

Published: 11 September 2023

Last updated: 31 July 2025

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1

Nel, Marko, and Imke de Kock. "AN INVESTIGATION INTO THE APPLICABILITY OF SUPER GRIDS IN A SUB-SAHARAN AFRICAN CONTEXT." South African Journal of Industrial Engineering 32, no. 2 (2021): 162–72. http://dx.doi.org/10.7166/32-3-2612.

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There is a need in energy-poor sub-Saharan Africa for a system to manage energy more efficiently and effectively both within and between countries. An approach that has been proven in other parts of the world to facilitate this is super grids. With their interconnection and information management systems, super grids can contribute to the increasingly effective and efficient management of energy, and they have the potential to increase sustainability. The applicability of such super grids in the sub-Saharan African context is still uncertain and is scientifically under-explored; thus there is

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2

Sarkar, Tanmay, Parveen Kumar, Mridula Dixit Bharadwaj та Umesh Waghmare. "Structural transformation during Li/Na insertion and theoretical cyclic voltammetry of the δ-NH4V4O10 electrode: a first-principles study". Physical Chemistry Chemical Physics 18, № 14 (2016): 9344–48. http://dx.doi.org/10.1039/c5cp07782f.

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A double layer δ-NH<sub>4</sub>V<sub>4</sub>O<sub>10</sub>, due to its high energy storage capacity and excellent rate capability, is a very promising cathode material for Li-ion and Na-ion batteries for large-scale renewable energy storage in transportation and smart grids.

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Lauritzen, P. H., J. T. Bacmeister, P. F. Callaghan, and M. A. Taylor. "NCAR_Topo (v1.0): NCAR global model topography generation software for unstructured grids." Geoscientific Model Development 8, no. 12 (2015): 3975–86. http://dx.doi.org/10.5194/gmd-8-3975-2015.

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Abstract. It is the purpose of this paper to document the NCAR global model topography generation software for unstructured grids (NCAR_Topo (v1.0)). Given a model grid, the software computes the fraction of the grid box covered by land, the grid-box mean elevation (deviation from a geoid that defines nominal sea level surface), and associated sub-grid-scale variances commonly used for gravity wave and turbulent mountain stress parameterizations. The software supports regular latitude–longitude grids as well as unstructured grids, e.g., icosahedral, Voronoi, cubed-sphere and variable-resolutio

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Gao, Qiang, Xiao-Lin Zhao, Ze Chang, Jian Xu, and Xian-He Bu. "Structural stabilization of a metal–organic framework for gas sorption investigation." Dalton Transactions 45, no. 16 (2016): 6830–33. http://dx.doi.org/10.1039/c6dt00640j.

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In this contribution, by inserting a ligand intoCo-MOF1, the reformed aggregation of triangle grids (Co-MOF1-tpt) shows enhanced stability. In addition, owing to the maintenance of porosity,Co-MOF1-tptalso reveals a certain CO<sub>2</sub>storage ability and CO<sub>2</sub>/CH<sub>4</sub>adsorption selectivity as expected.

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Fan, Xiaoxia, Dan Zhang, Shiyu Jiang, et al. "Construction and interconversion of anion-coordination-based (‘aniono’) grids and double helicates modulated by counter-cations." Chemical Science 10, no. 25 (2019): 6278–84. http://dx.doi.org/10.1039/c9sc02012h.

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6

Elsaidi, Sameh K., Mona H. Mohamed, Herbert T. Schaef, et al. "Correction: Hydrophobic pillared square grids for selective removal of CO2 from simulated flue gas." Chemical Communications 51, no. 94 (2015): 16872. http://dx.doi.org/10.1039/c5cc90503f.

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JALSENIUS, MARKUS, and KASPER PEDERSEN. "A SYSTEMATIC SCAN FOR 7-COLOURINGS OF THE GRID." International Journal of Foundations of Computer Science 19, no. 06 (2008): 1461–77. http://dx.doi.org/10.1142/s012905410800639x.

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We study the mixing time of a systematic scan Markov chain for sampling from the uniform distribution on proper 7-colourings of a finite rectangular sub-grid of the infinite square lattice, the grid. A systematic scan Markov chain cycles through finite-size subsets of vertices in a deterministic order and updates the colours assigned to the vertices of each subset. The systematic scan Markov chain that we present cycles through subsets consisting of 2×2 sub-grids and updates the colours assigned to the vertices using a procedure known as heat-bath. We give a computer-assisted proof that this s

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8

Gislon, Paola, Nadia Cerone, Viviana Cigolotti, et al. "Hydrogen blending effect on fiscal and metrological instrumentation: A review." International Journal of Hydrogen Energy 67 (March 2, 2024): 1295–307. https://doi.org/10.1016/j.ijhydene.2024.02.227.

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Abstract: A green hydrogen (H<sub>2</sub>) economy requires a sustainable, efficient, safe, and widespread infrastructure for transporting and distributing H<sub>2</sub> from production to consumption sites. Transporting a hydrogen/natural gas (H2NG) mixture, including pure H<sub>2</sub>, through the existing European natural gas (NG) infrastructure is considered a cost-effective solution, particularly in the transitional phase. Several reasons justify the H2NG blending option. The NG infrastructure can be efficiently repurposed to transport H<sub>2</sub>, by blending H<sub>2</sub> w

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Fiddes, J., and S. Gruber. "TopoSUB: a tool for efficient large area numerical modelling in complex topography at sub-grid scales." Geoscientific Model Development Discussions 5, no. 2 (2012): 1041–76. http://dx.doi.org/10.5194/gmdd-5-1041-2012.

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Abstract. Mountain regions are highly sensitive to global climate change. However, large scale assessments of mountain environments remain problematic due to the high resolution required of model grids to capture strong lateral variability. To alleviate this, tools are required to bridge the scale gap between gridded climate datasets (climate models and re-analyses) and unresolved (by coarse grids) sub-grid mountain topography. We address this problem with a sub-grid method. It relies on sampling the most important aspects of land surface heterogeneity through a lumped scheme, allowing for the

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10

Zhang, Yu, Qianqian Yang, Jingjing Lu, Mei Guo, Xiao-Lei Li, and Jinkui Tang. "Heterometallic {DyIII2FeII2} grids with slow magnetic relaxation and spin crossover." Inorganic Chemistry Frontiers 8, no. 7 (2021): 1779–87. http://dx.doi.org/10.1039/d0qi01471k.

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The self-assembly of a Dy<sup>III</sup> ion, an Fe<sup>II</sup> ion and a multitopic H<sub>2</sub>L ligand produces novel [2 × 2] {DyIII2FeII2} grids exhibiting slow magnetic relaxation and spin crossover.

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11

Lauritzen, P. H., J. T. Bacmeister, P. F. Callaghan, and M. A. Taylor. "NCAR global model topography generation software for unstructured grids." Geoscientific Model Development Discussions 8, no. 6 (2015): 4623–51. http://dx.doi.org/10.5194/gmdd-8-4623-2015.

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Abstract. It is the purpose of this paper to document the NCAR global model topography generation software for unstructured grids. Given a model grid, the software computes the fraction of the grid box covered by land, the gridbox mean elevation, and associated sub-grid scale variances commonly used for gravity wave and turbulent mountain stress parameterizations. The software supports regular latitude-longitude grids as well as unstructured grids; e.g. icosahedral, Voronoi, cubed-sphere and variable resolution grids. As an example application and in the spirit of documenting model development

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12

Mariscotti, Andrea. "Power quality metrics for DC grids with pulsed power loads." ACTA IMEKO 10, no. 2 (2021): 153. http://dx.doi.org/10.21014/acta_imeko.v10i2.1065.

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<span lang="EN-GB">DC grids can effectively feed pulsed power loads (PPLs), integrating local energy storage to minimize the impact on other connected loads and implementing buffered sub-grids to isolate susceptible loads even more. The identification of regulatory limits for PPL integration and DC grid response and the assessment of PPL impact necessitate suitable Power Quality (PQ) metrics. Existing indexes and limits (e.g. ripple and distortion, voltage fluctuation) are compared to other metrics, derived from control methods and knowledge of the peculiar characteristics of PPL and int

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13

Razzaq, Syed Abdul, and Vairavasamy Jayasankar. "Energy management system for AC/DC HMGS integrated with interconnected renewable sources and interlinking converter." International Journal of Applied Power Engineering (IJAPE) 12, no. 1 (2023): 24. http://dx.doi.org/10.11591/ijape.v12.i1.pp24-36.

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AC/DC hybrid micro grid system (HMGS) is designed with renewable energy sources (RES) and battery energy storage system (BESS) with unique control schemes, interfaced with multi terminal interlinking converters (ILCs). This ILC operates on droop control scheme to guarantee bidirectional power sharing to AC/DC sub grids. The power sources in AC/DC sub grids like PV, Fuel cell, BESS are controlled by advance control methods for maximum power extraction with power quality. A three-level control structure is designed for optimal energy management system (EMS). The first level confirms the power ba

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Syed, Abdul Razzaq, and Jayasankar Vairavasamy. "Energy management system for AC/DC HMGS integrated with interconnected renewable sources and interlinking converter." International Journal of Applied Power Engineering 12, no. 01 (2023): 24~36. https://doi.org/10.11591/ijape.v12.i1.pp24-36.

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AC/DC hybrid micro grid system (HMGS) is designed with renewable energy sources (RES) and battery energy storage system (BESS) with unique control schemes, interfaced with multi terminal interlinking converters (ILCs). This ILC operates on droop control scheme to guarantee bidirectional power sharing to AC/DC sub grids. The power sources in AC/DC sub grids like PV, Fuel cell, BESS are controlled by advance control methods for maximum power extraction with power quality. A three-level control structure is designed for optimal energy management system (EMS). The first level confirms the power ba

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15

Xu, Lin, Yong-Hong Tang, Wei Pu, and Yang Han. "Hybrid electromechanical-electromagnetic simulation to SVC controller based on ADPSS platform." Journal of Energy in Southern Africa 25, no. 4 (2014): 112–22. http://dx.doi.org/10.17159/2413-3051/2014/v25i4a2244.

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To test the dynamic performance and damping features of a static var compensator (SVC) controller accurately in large-scale interconnected AC/DC hybrid power systems, it is of vital significance to build the detailed electromagnetic transient model. However, it is unrealistic and time-consuming to build the detailed models of all the devices in the actual large-scale power grid. Utilizing the hybrid simulation function in the advanced digital power system simulator (ADPSS) and by dividing the large-scale power grid into the electromagnetic transient sub-grids and electromechanical sub-grids, t

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16

Guo, Erlin, and Patrick Ling. "Estimation of the quadratic variation of log prices based on the Itô semi-martingale." Electronic Research Archive 32, no. 2 (2024): 799–811. http://dx.doi.org/10.3934/era.2024038.

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<abstract><p>As the availability of high-frequency data becomes more widespread, it has become very popular to model random fluctuations of some econometric variables over time using Itô semi-martingale. An emblematic problem is to estimate the quadratic variation, i.e., the integrated volatility of log prices, using noisy high frequency data with endogenous time and jumps. We propose a methodology that combines the multiple sub-grids and thresholds. First, the sub-sample is used to reduce the effect of the noise. Then, the threshold method is used to get rid of the effect of jumps

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17

Hong, Jian-Shiung, Wei-Ming Cheng, Meng-Chang Yang, Ruei-Cheng Shiu, Yung-Chiang Lan, and Kuan-Ren Chen. "Enhancing Efficiency of Electromagnetic Simulation in Time Domain with Transformation Optics." Applied Sciences 8, no. 7 (2018): 1133. http://dx.doi.org/10.3390/app8071133.

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With sub-wavelength scaled structures in a large system, the conventional finite-difference time-domain method can consume much computational resources since it includes both the spatial and temporal dimension in the scheme. In order to reduce the computational cost, we combine the novel methodology “transformation optics” in the simulation to map a physical coordinate with designated non-uniform grids to a uniform numerical coordinate. For a demonstration, the transmission spectrum through a sub-wavelength metallic aperture with one-dimensional and two-dimensional coordinate transformation is

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18

Welsch, Manuel, Morgan Bazilian, Mark Howells, et al. "Smart and Just Grids for sub-Saharan Africa: Exploring options." Renewable and Sustainable Energy Reviews 20 (April 2013): 336–52. http://dx.doi.org/10.1016/j.rser.2012.11.004.

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19

Knight, Helen. "Solar Grids Set to Transform Lives in Sub-Saharan Africa." Engineer 299, no. 7908 (2019): 6. http://dx.doi.org/10.12968/s0013-7758(23)90737-3.

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20

Antonanzas-Torres, Fernando, Javier Antonanzas, and Julio Blanco-Fernandez. "Environmental Impact of Solar Home Systems in Sub-Saharan Africa." Sustainability 13, no. 17 (2021): 9708. http://dx.doi.org/10.3390/su13179708.

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Solar home systems (SHS) represent one of the most promising technologies for a rapid and independent electrification in those areas of Sub-Saharan Africa (SSA) without access to electricity. This study addressed the environmental impact of SHS in SSA through updated life cycle inventories and five impact categories: greenhouse gases (GHG) emissions, fossil fuels, metal and water depletion and human toxicity. Sixteen scenarios were considered, including manufacturing, transportation, recycling and user-related variables, such as the installation site, adequacy of SHS user operation and battery

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21

AKAZAWA, Masayuki, Kengo SUZUKI, Yutaka TABE, and Takemi CHIKAHISA. "Cost and CO₂ reduction effect of distributed CHPs cooperatively networked by grids." Transactions of the JSME (in Japanese) 82, no. 836 (2016): 15–00442. http://dx.doi.org/10.1299/transjsme.15-00442.

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22

Lwakatare, Bertha, Priyanka Vyavahare, Kedar Mehta, and Wilfried Zörner. "Electrification Planning for Off-Grid Communities in Sub-Saharan Africa: Advancing Energy Access." Energies 17, no. 23 (2024): 5994. http://dx.doi.org/10.3390/en17235994.

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Sub-Saharan Africa, especially its rural areas, faces significant challenges in achieving universal electrification despite its abundant renewable energy resources. The region has the highest population without access to electricity, largely due to economic, infrastructural, and geographical barriers. Energy poverty is a critical issue that hinders sustainable development and exacerbates inequalities. Namibia’s sustainable energy policy aligns with the global Sustainable Development Goals (SDGs), particularly SDG 7, which aims to provide affordable and reliable modern energy access for all. Th

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23

JADHAV, S. K. "Summer monsoon low pressure systems over the Indian region and their relationship with the sub-divisional rainfall." MAUSAM 53, no. 2 (2022): 177–86. http://dx.doi.org/10.54302/mausam.v53i2.1633.

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In the present paper performance of the monthly sub-divisional summer monsoon rainfall is studied in association with the position of the Low Pressure System (LPS) over the Indian region. Existence of the LPS over a particular location increases the rainfall activities in certain parts of the country while decreases in some other parts. For this study, the Indian region (5°-35° N and 60° -100° E) is divided into 5° Lat. ´ 5° Long. grids. The duration of LPS is taken in terms of LPS days with respect to the location of LPS in a particular grid. Monthly total number of LPS days in each of the gr

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24

Sanjay Dambhare, Shivaji Raskar,. "Advancing Distance Relaying Reliability: S Transform Solution for Renewable Energy-Infused Smart Grid." Journal of Electrical Systems 20, no. 2 (2024): 2186–97. http://dx.doi.org/10.52783/jes.1987.

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Distance relaying is a crucial component in safeguarding transmission lines globally. However, the presence of Sub-Synchronous Resonance (SSR) introduces challenges, as oscillations in voltage and current magnitudes adversely affect the performance of conventional distance relays. Detecting faults accurately during these oscillations poses a significant challenge for traditional relaying mechanisms. This paper addresses the issue of SSR-induced maloperations in distance relays, particularly in the context of the increasing penetration of renewable energy resources in smart grids. The integrati

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Ebiloma, Stella. "Identification of the non-tree vegetation of opada forest reserve for conservation." Environment Conservation Journal 21, no. 1&2 (2020): 31–38. http://dx.doi.org/10.36953/ecj.2020.211204.

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Objectives of study: to identify the non-tree vegetation of Opada Forest Reserve (OFR) and provide comprehensive vegetation data for monitoring, conservation and management of present biodiversity. OFR is about 215.76km2 in size. Its map was gridded at an interval of one degree and each grid was 3.61 km2. Using a table of random numbers, ten of the grids were randomly selected. Within each grid, straight line transects of 2km long were randomly laid using Global Positioning System, to locate transects in the right grids and prismatic compass to maintain straight transects, 25m × 25m quadrates

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BIEN, R., B. FUCHS, and R. WIELEN. "High Spatial Resolution Using the Conventional Particle-Mesh Technique." International Journal of Modern Physics C 02, no. 01 (1991): 3–13. http://dx.doi.org/10.1142/s0129183191000020.

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The use of the particle-mesh technique has a long and successful history in the field of computer simulations of collisionless gravitational systems, such as galaxies. Since the method allows the treatment of large numbers of particles statistical noise has only a small effect. On the other hand, severe problems arise when high density peaks must be resolved. In order to master these difficulties we have worked out a procedure which is an extension of the standard particle-mesh code in three-dimensional Cartesian coordinates. The basic idea is simply to introduce additional grids and sub-grids

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Fiddes, J., and S. Gruber. "TopoSUB: a tool for efficient large area numerical modelling in complex topography at sub-grid scales." Geoscientific Model Development 5, no. 5 (2012): 1245–57. http://dx.doi.org/10.5194/gmd-5-1245-2012.

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Abstract. Mountain regions are highly sensitive to global climate change. However, large scale assessments of mountain environments remain problematic due to the high resolution required of model grids to capture strong lateral variability. To alleviate this, tools are required to bridge the scale gap between gridded climate datasets (climate models and re-analyses) and mountain topography. We address this problem with a sub-grid method. It relies on sampling the most important aspects of land surface heterogeneity through a lumped scheme, allowing for the application of numerical land surface

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Boubaker, K., A. Colantoni, and E. Allegrini. "Renewable Energy in Eastern North Africa in Terms of Patterns of Coupling to Czisch European HVDC Super Grid." International Journal of Renewable Energy Development 2, no. 2 (2013): 125–29. http://dx.doi.org/10.14710/ijred.2.2.125-129.

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In this study, wind energy potential and perspectives in the eastern North Africa region (Tunisia) have been investigated in terms of connectivity to the projected Czisch European HVDC super grid. A simplified extracted scheme of this grid has been used as a guide to optimize transportation efficiency through the whole net. Wind, as an available and easily exploitable renewable energy was showing to have a promising future for 2025 horizon in the context of a connected net with the European Union, despite local sub-grids disparities. This is also to emphasis HVDC technology adequacy for econom

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Kim, Namjo, Shinyoung Choi, Seong-Jun Yang, et al. "Graphene Nanoribbon Grids of Sub-10 nm Widths with High Electrical Connectivity." ACS Applied Materials & Interfaces 13, no. 24 (2021): 28593–99. http://dx.doi.org/10.1021/acsami.1c03437.

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Ren, Quan-yao, Wen-xiong Zhou, Si-jia Du, Zhong-chun Li, and Liang-ming Pan. "Sub-channel flow regime maps in vertical rod bundles with spacer grids." International Journal of Heat and Mass Transfer 122 (July 2018): 1138–52. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2018.01.133.

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Li, Yuqin, Jining Yan, Xiaohui Huang, Xiangyou He, Ze Deng, and Yunliang Chen. "R-MLGTI: A Grid- and R-Tree-Based Hybrid Index for Unevenly Distributed Spatial Data." ISPRS International Journal of Geo-Information 14, no. 6 (2025): 231. https://doi.org/10.3390/ijgi14060231.

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In recent years, with the development of sensor technology, the volume of spatial data has grown exponentially. However, this data is often unevenly distributed, and traditional indexing methods cannot predict the overall data distribution when data are continuously inserted into the database. This makes them inefficient for indexing large-scale, unevenly distributed spatial data. This paper proposes a hybrid indexing method based on the grid-indexing and R-tree methods, called R-MLGTI (R-Multi-Level Grid–Tree Index). The method first divides the two-dimensional space using the Z-curve to form

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Quan, Dang Minh, and Odej Kao. "ON ARCHITECTURE FOR SLA-AWARE WORKFLOWS IN GRID ENVIRONMENTS." Journal of Interconnection Networks 06, no. 03 (2005): 245–63. http://dx.doi.org/10.1142/s0219265905001411.

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Service Level Agreements (SLAs) are currently one of the major research topics in Grid Computing, as they serve as a foundation for reliable and predictable Grids. SLAs define an explicit statement of expectations and obligations in a business relationship between provider and customer. Thus, SLAs should guarantee the desired and a-priori negotiated Quality of Service (QoS), which is a mandatory prerequisite for the Next Generation Grids. This development is proved by a manifold research work about SLAs and architectures for implementing SLAs in Grid environments. However, this work is mostly

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Serebryannikov, Andriy E., Akhlesh Lakhtakia, and Ekmel Ozbay. "Thermally switchable, bifunctional, scalable, mid-infrared metasurfaces with VO₂ grids capable of versatile polarization manipulation and asymmetric transmission." Optical Materials Express 12, no. 12 (2022): 4594. http://dx.doi.org/10.1364/ome.465468.

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We conceptualized three-array scalable bifunctional metasurfaces comprising only three thin strip grids and numerically determined their characteristics in the mid-infrared spectral regime for switchable operation scenarios involving polarization manipulation and related diodelike asymmetric transmission (AT) as one of two functionalities. A few or all of the grids were taken to be made of VO2, a bifunctionality-enabling phase-change material; there are no layers and/or meta-atoms comprising simultaneously both metal and VO2. For each proposed metasurface, two effective structures and, therefo

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Dalal, Nisha, Martin Mølna, Mette Herrem, Magne Røen, and Odd Erik Gundersen. "Day-Ahead Forecasting of Losses in the Distribution Network." AI Magazine 42, no. 2 (2021): 38–49. http://dx.doi.org/10.1609/aimag.v42i2.15097.

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Utility companies in the Nordics have to nominate how much electricity is expected to be lost in their power grid the next day. We present a commercially deployed machine learning system that automates this day-ahead nomination of the expected grid loss. It meets several practical constraints and issues related to, among other things, delayed, missing and incorrect data and a small data set. The system incorporates a total of 24 different models that performs forecasts for three sub-grids. Each day one model is selected for making the hourly day-ahead forecasts for each sub-grid. The deployed

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Das, Soumya Ranjan, Alok Kumar Mishra, Prakash Kumar Ray, Surender Reddy Salkuti, and Seong-Cheol Kim. "Application of Artificial Intelligent Techniques for Power Quality Improvement in Hybrid Microgrid System." Electronics 11, no. 22 (2022): 3826. http://dx.doi.org/10.3390/electronics11223826.

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The hybrid AC-DC microgrid (MG) has gained popularity recently as it offers the benefits of AC and DC systems. Interconnecting AC-DC converters are necessary since the MG has both DC and AC sub-grids. Adding an extra harmonic adjustment mechanism to the interlinking converters is promising because non-linear AC loads can worsen the quality of the voltage on the AC bus. The interlinking converters’ primary function is to interchange real and reactive power between DC and AC sub-grids, so the typical harmonic controlling approach implemented for active power filters (APFs) might not be appropria

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Matsushima, Fumiya, Mutsumi Aoki, Yuta Nakamura, Suresh Chand Verma, Katsuhisa Ueda, and Yusuke Imanishi. "Multi-Timescale Voltage Control Method Using Limited Measurable Information with Explainable Deep Reinforcement Learning." Energies 18, no. 3 (2025): 653. https://doi.org/10.3390/en18030653.

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The integration of photovoltaic (PV) power generation systems has significantly increased the complexity of voltage distribution in power grids, making it challenging for conventional Load Ratio Control Transformers (LRTs) to manage voltage fluctuations caused by weather-dependent PV output variations. Power Conditioning Systems (PCSs) interconnected with PV installations are increasingly considered for voltage control to address these challenges. This study proposes a Machine Learning (ML)-based control method for sub-transmission grids, integrating long-term LRT tap-changing with short-term

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Mutesi, Prossy, Santos Kihwele, and Emanuel Matee. "Clustering Mini-Grids to Enhance Power Systems Reliability in Distributed Generation." Tanzania Journal of Engineering and Technology 44, no. 1 (2024): 204–14. https://doi.org/10.52339/tjet.v44i1.1039.

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This study investigates the effectiveness of clustering mini-grids as a method to improve the reliability and operational stability of distributed generation systems in remote areas, particularly where renewable energy sources are predominant. As renewable resources like solar and wind are increasingly integrated into mini-grids, these systems face various challenges, particularly in maintaining stable voltage and frequency across interconnected networks. Such issues are compounded by the intermittent nature of renewable energy sources and the lack of extensive communication infrastructure in

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Anu G Pillai. "Power Quality Improvement for Hybrid Microgrid Integrated with Renewable Energy Sources." Communications on Applied Nonlinear Analysis 32, no. 2s (2024): 22–33. http://dx.doi.org/10.52783/cana.v32.2247.

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Given the present energy crisis and depletion of fossil fuel reserves, there is a pressing need to enhance the integration of Renewable Energy Sources (RES) into the power system. This research focuses on designing and managing a Hybrid Microgrid (HMG) in fluctuating RES. The Direct Current (DC) sub-grid comprises a Wind Turbine (WT), a solar Photovoltaic (PV) array equipped with a Perturb-and-Observation (P&O) Maximum Power Point Tracking (MPPT) method, a boost conversion, and a Battery Energy Storage System (B-ESS) connected to DC demands. The Alternative Current (AC) sub-grid comprises

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Kurniati, Titi, Adrial Sy, and Purnawan Purnawan. "The accessibility of tsunami prone areas society towards potential shelters: a case study in Padang Barat sub-district." E3S Web of Conferences 156 (2020): 04001. http://dx.doi.org/10.1051/e3sconf/202015604001.

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Padang city, which is located on the western coast of Sumatra, has the potential to experience a powerful earthquake and thus generate tsunami. After the earthquake, with or without a tsunami warning, the society is required to evacuate. Because of the short time, vertical evacuation is the best alternative for the safety of society. Evacuation on foot to the temporary rescue building (Temporary Evacuation Shelter, TES) is more advisable than evacuation using motorized vehicles that tends to cause congestion. Temporary evacuation maps and potential shelters in Padang have been established by B

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Guerrero, Manuel, Francisco Montoya, Raul Baños, Alfredo Alcayde, and Consolación Gil. "Community detection in national-scale high voltage transmission networks using genetic algorithms." Advanced Engineering Informatics 38 (July 6, 2018): 232–41. https://doi.org/10.1016/j.aei.2018.07.001.

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The large-scale interconnection of electricity networks has been one of the most important investments made by electric companies, and this trend is expected to continue in the future. One of the research topics in this field is the application of graph-based analysis to identify the characteristics of power grids. In particular, the application of community detection techniques allows for the identification of network elements that share valuable properties by partitioning a network into some loosely coupled sub-networks (communities) of similar scale, such that nodes within a community are d

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Kim, Jong-Hoon, Bieke Tack, Fabio Fiorino, et al. "Examining geospatial and temporal distribution of invasive non-typhoidalSalmonelladisease occurrence in sub-Saharan Africa: a systematic review and modelling study." BMJ Open 14, no. 3 (2024): e080501. http://dx.doi.org/10.1136/bmjopen-2023-080501.

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BackgroundInvasive non-typhoidalSalmonella(iNTS) disease is a significant health concern in sub-Saharan Africa. While our knowledge of a larger-scale variation is growing, understanding of the subnational variation in iNTS disease occurrence is lacking, yet crucial for targeted intervention.MethodWe performed a systematic review of reported occurrences of iNTS disease in sub-Saharan Africa, consulting literature from PubMed, Embase and Web of Science published since 2000. Eligibility for inclusion was not limited by study type but required that studies reported original data on human iNTS dise

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Ren, Quan-yao, Liang-ming Pan, Wen-xiong Zhou, Hang Liu, and Ting-pu Ye. "Drift-flux model of sub-channel in vertical rod bundles with spacer grids." International Journal of Heat and Mass Transfer 126 (November 2018): 946–56. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2018.05.135.

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Kim, Jong-Hoon, Jungsoon Choi, Chaelin Kim, et al. "Mapping the incidence rate of typhoid fever in sub-Saharan Africa." PLOS Neglected Tropical Diseases 18, no. 2 (2024): e0011902. http://dx.doi.org/10.1371/journal.pntd.0011902.

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Background With more than 1.2 million illnesses and 29,000 deaths in sub-Saharan Africa in 2017, typhoid fever continues to be a major public health problem. Effective control of the disease would benefit from an understanding of the subnational geospatial distribution of the disease incidence. Method We collated records of the incidence rate of typhoid fever confirmed by culture of blood in Africa from 2000 to 2022. We estimated the typhoid incidence rate for sub-Saharan Africa on 20 km × 20 km grids by exploring the association with geospatial covariates representing access to improved water

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SUN, MING BO, XUE SONG BAI, WEI DONG LIU, JIAN HAN LIANG, and ZHEN GUO WANG. "A MODIFIED SUB-CELL-FIX METHOD FOR RE-INITIALIZATION OF LEVEL-SET DISTANCE FUNCTION AND ITS DEPENDENCE TESTS ON GRID STRETCHING." Modern Physics Letters B 24, no. 15 (2010): 1615–29. http://dx.doi.org/10.1142/s0217984910024018.

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The sub-cell-fix (SCF) method proposed by Russo and Smereka3 computes the distance function of the cells adjacent to the zero level-set without disturbing the original zero level-set. A modified sub-cell-fix scheme independent of local curvature is developed in this paper, which makes use of a combination of the points adjacent to zero level-set surfaces and preserves the interface in a second-order accuracy. The new sub-cell-fix scheme is capable of handling large local curvature, and as a result it demonstrates satisfactory performance on several challenging test cases. The limitations of th

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Abbas, Ahmed H. R., M. Rajeswari, Deepti Sharma, Rahul Singh, P. Jeyakani, and Dharmesh Dhabliya. "Optimization of Nanogrids for Remote Off-Grid Communities." E3S Web of Conferences 540 (2024): 01014. http://dx.doi.org/10.1051/e3sconf/202454001014.

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This review article delves into the advancements in the realm of nanogrids and their potential in addressing energy challenges, particularly in regions with limited access to centralized power grids. The paper reviews the work in the areas of nanogrids as solutions for regions like sub-Saharan Africa, where a significant population lacks access to main grid electricity. The integration of multiple nanogrids within a community, coupled with an investor energy bank, is explored as a means to alleviate the economic burden of energy storage and to harness the full potential of solar energy. The ar

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Chaurase, Payal, and Pankaj Ramtekkar. "A new design of control & power management strategies of hybrid ac-dc microgrids toward high power quality." Journal of Physics: Conference Series 2089, no. 1 (2021): 012036. http://dx.doi.org/10.1088/1742-6596/2089/1/012036.

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Abstract The micro grid idea provides for the lack of several reversing switches to unitary AC-DC grid that enables connection and charges (loads) to the electrical systems with changeable regenerative AC and CC sources. Safe operation and gadget safety involve digital integration with utilities/grid through power converters. Enhanced client reliability, decreased input losses, local voltages are supported, and waste heat efficiency increased, voltage drop or interruptible supply of electricity can be customized to satisfy their unique customer demands. Work at present Analyses the performance

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Dalal, Nisha, Martin Mølnå, Mette Herrem, Magne Røen, and Odd Erik Gundersen. "Day-Ahead Forecasting of Losses in the Distribution Network." Proceedings of the AAAI Conference on Artificial Intelligence 34, no. 08 (2020): 13148–55. http://dx.doi.org/10.1609/aaai.v34i08.7018.

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We present a commercially deployed machine learning system that automates the day-ahead nomination of the expected grid loss for a Norwegian utility company. It meets several practical constraints and issues related to, among other things, delayed, missing and incorrect data and a small data set. The system incorporates a total of 24 different models that performs forecasts for three sub-grids. Each day one model is selected for making the hourly day-ahead forecasts for each sub-grid. The deployed system reduces the MAE with 41% from 3.68 MW to 2.17 MW per hour from mid July to mid October. It

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Jacq, Pascal, Pierre-Henri Maire, and Rémi Abgrall. "A Nominally Second-Order Cell-Centered Finite Volume Scheme for Simulating Three-Dimensional Anisotropic Diffusion Equations on Unstructured Grids." Communications in Computational Physics 16, no. 4 (2014): 841–91. http://dx.doi.org/10.4208/cicp.310513.170314a.

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AbstractWe present a finite volume based cell-centered method for solving diffusion equations on three-dimensional unstructured grids with general tensor conduction. Our main motivation concerns the numerical simulation of the coupling between fluid flows and heat transfers. The corresponding numerical scheme is characterized by cell-centered unknowns and a local stencil. Namely, the scheme results in a global sparse diffusion matrix, which couples only the cell-centered unknowns. The space discretization relies on the partition of polyhedral cells into sub-cells and on the partition of cell f

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Chang, Che-Hao, Riki Rahmad, Shiang-Jen Wu, and Chih-Tsung Hsu. "Spatial Frequency Analysis by Adopting Regional Analysis with Radar Rainfall in Taiwan." Water 14, no. 17 (2022): 2710. http://dx.doi.org/10.3390/w14172710.

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This study proposed a spatially and temporally improving methodology adopting the Regional Frequency Analysis with an L-moments approach to estimate rainfall quantiles from 22,787 grids of radar rainfall in Taiwan for a 24-hour duration. Due to limited radar coverage in the eastern region, significant discordant grids were found in the coastal area of the eastern region. A total of 171 grids with Di > 6 were set as discordant grids and removed for further analysis. A K-means cluster analysis using scaled at-site characteristics was used to group the QPESUMS grids in Taiwan into 22 clusters/

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Zhang, Yu, Zhe Yan, Cui Cui Zhou, Tie Zhou Wu, and Yue Yang Wang. "Capacity allocation of HESS in micro-grid based on ABC algorithm." International Journal of Low-Carbon Technologies 15, no. 4 (2020): 496–505. http://dx.doi.org/10.1093/ijlct/ctaa014.

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Abstract The hybrid energy storage system (HESS) is a key component for smoothing fluctuation of power in micro-grids. An appropriate configuration of energy storage capacity for micro-grids can effectively improve the system economy. A new method for HESS capacity allocation in micro-grids based on the artificial bee colony (ABC) algorithm is proposed. The method proposed a power allocation strategy based on low pass filter (LPF) and fuzzy control. The strategy coordinates battery and supercapacitor operation and improves the battery operation environment. The fuzzy control takes the state of

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