Types Of Panels Research Articles

Possibilities of developing technology for generating electricity using photovoltaic modules

The purpose of this paper is to present the most commonly used types of photovoltaic panels and principles of their operation. Mono- and polycrystalline cells are presented, with their advantages and disadvantages indicated. The following section describes the process of obtaining electricity by using the photovoltaic and thermoelectric phenomena occurring in cells. Then, the structure and principle of operation of dye cells, thin-film cells and fourth-generation cells were presented on the example of cells using the Schottky junction to generate energy. The article also presents the method of obtaining single crystals of silicon, developed by Jan Czochralski, who lived at the turn of the 19th and 20th centuries. The method he developed laid the foundations for the development of modern integrated circuits - it was a milestone in the development of electronics.

Experimental Study of Damage Energy on the Bow of a Vessel with Second-Generation Viscoelastic Layers for the Galápagos Islands

Experimental study of the damage energy is a reproduction of the GFRP vessels’ slamming in the sea. The investigation was carried out to the laboratories by the construction of two types of GFRP panels: viscoelastic and non- viscoelastic modified. Through a bending test, the data collection was developed to get the measurement of the variables in key points. The obtained results showed an expected behavior because the modified specimens were able to spread the force induced from the center to the edges. Besides, the damage energy in the modified panels return in bigger amounts than the unmodified. Flexibility demonstrated a higher rate of increase in the unmodified panels, indicating that the viscoelastic layer contributed to the stiffness increment in the modified panel. In conclusion, viscoelastic materials help to dissipate the energy absorbed by the structure, elongating the lifetime. Also, this study expands the basic knowledge of viscoelastic materials’ behavior in the GFRP planing hull vessels.

Perencanaan Pembangkit Listrik Tenaga Surya (PLTS) Sistem Hybrid Pada Jaringan Kelistrikan Di Rumah Sakit Umum Yarsi Pontianak

Electrical energy is very important in everyday life to support the activities of various sectors. Fossil fuels as an energy source are a top priority, therefore renewable energy is an alternative to replace the limitations of fossil fuels which is the main priority in efforts to generate electrical energy in Indonesia. The high intensity of sunlight in Indonesia, especially in Pontianak City, is very suitable for building a Solar Power Plant (PLTS). The aim of this research is to find out how much potential PLTS has using applications PVsyst 7.3by utilizing the roof of the hospital building. This research uses three methods for economic analysis and analyzing the feasibility of PLTS. The method used isNet Present Value (NPV), Profitability Index (PI), and Discounted Payback Period (DPP). The results of research carried out using Software PVsyst 7.3 It was found that the PLTS system was installed on the roof of YARSI Pontianak General Hospital with a slope angle of 4O namely 115 kWp with the type of solar panel used being the Jinko Solar Tiger Neo N-type 72HL4-BDV 580Wp 198 units, 3 inverters of the SUN2000-30/36/40KTL-M3 type with a capacity of 40 kW, and batteries with type Sunlight RES OPzS with a capacity of 3060 Ah. Based on the results of calculations that have been carried out, the initial investment required is IDR. 1,578,472,422. Analysis of the economic feasibility of PLTS using 3 methods has been carried out to obtain an NPV value of Rp. 797.610.941,86, PI value of 1.505, and DPP value of 14 years. The three methods used in this research show that PLTS is feasible.

Performance Evaluation of Distance Relay Operation in Distribution Systems with Integrated Distributed Energy Resources

This article presents the evaluation of the performance of the distance relay (ANSI function 21) when integrating Distributed Energy Resources (DERs) in a Local Distribution System (LDS). The aim is to understand the impacts of and the necessary modifications required in the operation of distance relays, considering different levels of DER aggregation, and identifying any threshold levels before issues arise. To achieve this, first, a comprehensive review was carried out to analyze the impacts generated in the protection systems. Second, by using the DigSilent Power Factory software, the implementation of the distance relay using a IEEE 13 Node Test Feeder was validated. The aggregation of the three fundamental types of DG, synchronous machines, solar panels, and wind turbines, was evaluated. The threshold at which distributed generation power injection begins to compromise distance protection performance was identified. This study compares the outcomes of using mho and quadrilateral protection schemes.

Understanding a new wrinkling behavior of annular grooved panel during flexible free incremental sheet forming

Wrinkling behavior of sheet metal by inappropriate process parameters and the resultant variation of thickness and microstructure during incremental sheet forming (ISF) have significant impact on forming stability and geometric profile. The wrinkling-related mechanism is yet to be well understood, which make it difficult to effectively control wrinkling defects during ISF. In the present work, the wrinkling behavior and related mechanism of a typical annular grooved panel are investigated during a novel flexible free ISF process. Experiments demonstrate that during this ISF process, the sheet material sequentially undergoes 4 deformation modes: contacting state under plane strain condition, contracting state with only elastic deflection, thickening state under uniaxial compression condition, and wrinkling state where the circumferential compressive stress exceeds the critical wrinkling stress. The evolution of these deformation modes is dominantly caused by the increasing of edge contraction and circumferential stress, which are induced by the bending moment from the forming tool and auxiliary sheets. Based on the mechanism, an analytical model is developed to predict the wrinkling behavior, by which the corresponded sheet thickness, bending moment, circumferential compressive stress and critical wrinkling stress during the wrinkling process could be comprehensively calculated. Experimental results validate that the analytical model can accurately predict the wrinkling behavior under different process parameters, material properties and auxiliary sheet materials. Through microstructural characterization, numerical simulation and analytical modeling, the influence of process parameter and material property on wrinkling behavior is systematically investigated, along with the variation of sheet thickness and microstructure under different wrinkling modes. This work enhance a deep understanding of wrinkling behavior during ISF process, thereby providing effective methods for process optimization and quality improvement.

Pediatric Epilepsy Genetic Testing Results and Long-term Seizure Freedom.

Objective: To determine whether there is a correlation of genetic diagnosis/result with long-term seizure freedom in pediatric epilepsy patients. Methods: This was a prospective and retrospective cohort study of children with epilepsy referred for genetic testing at a single center. The primary outcomes were presence and type of genetic diagnosis (pathogenic, benign, or variant of uncertain significance) and patient epilepsy status (seizure free, treatment failure, uncertain). Epilepsy gene panels were the primary method of genetic testing. Results: The prospective cohort had 22 patients followed for >11 years and for whom genetic testing was then performed; the retrospective cohort had 78 patients with previous genetic testing followed for >8 years. In the prospective cohort, one patient each of the seizure free or treatment failure groups had a pathogenic genetic variant; mean Combined Annotation Dependent Depletion (CADD) scores 22 and 24, respectively (P = .62). In the retrospective cohort, there was no difference in the number of variants (P = .97), the variant interpretations (P = .29 ClinVar, P = .39 lab interpretation) or mean CADD scores (P = .29) between the seizure-free, treatment failure, and uncertain epilepsy patients. Whole exome and genome sequencing identified pathogenic variants in 70% of patients with treatment failure but were not performed in seizure-free patients. Significance: Our findings show no correlation of the presence or type of epilepsy gene panel result with long-term seizure freedom in pediatric patients. The yield and specificity of pathogenic variants may be higher using whole exome and whole genome sequencing in patients with treatment-resistant epilepsy. Whole exome and whole genome sequencing, or more targeted understanding of specific variants, may be needed to improve the utility of pediatric epilepsy genetic testing.

Global buckling response of sandwich panels with additively manufactured lattice cores

This paper deals with the analytical and numerical global buckling analysis of rectangular sandwich plates utilized AlSi10 Mg in both facesheets and lattice cores. In this study, six different strut-based lattice core models are designed. Additionally, the buckling resistance of lattice panels is compared with a typical honeycomb panel. Analytical studies were carried out using Kirchoff plate theory (CLPT), first-order shear deformation theory (FSDT) coded on MATLAB and finite element (FE) analyses in Abaqus. In the theoretical approaches, the Navier solution is derived for sandwich plates with simply supported boundary conditions at all edges. In the FE analyses, validated homogenized lattice structures models were used to avoid excessive numbers of elements and to save computational time. The parametric effects of side-to-thickness ratio, and different designed core cells on global buckling responses are investigated. As a result of comparing the analytical results with the FE model, a good agreement is obtained, and it is found that analytical buckling analyses FSDT can be used within certain size limits for the global buckling analysis of lattice core sandwich structures.

Waste-based panels with cement grout as an infill material for composite railway sleepers

The development of high performance and eco-friendly composite railway sleepers at a reasonable price is a great challenge for composite railway sleeper manufacturers. The study proposed a railway sleeper concept based on high-performance fibre composites and low-cost waste-based materials to overcome this challenge. In this concept, thin hollow composite tubes are filled with high volume waste-based panels, which are bonded together with cement grout. This study examined the effect of cement grout, grout thickness, panel types, and surface preparation of the panels on the bond behaviour between the panels and cement grout. It also investigated the bending behaviour of manufactured railway sleepers by evaluating the effects of filling hollow tubes, the orientation of the infill panels, and the types of infill materials. Results indicate that the proposed concept has a high potential for development of high performance and eco-friendly composite railway sleepers at a competitive price due to the incorporation of high volume of waste materials. The results of the study will serve as a guide to the manufacture and design of composite railway sleepers.

Performance assessments of ground source heat pump assisted by various solar panels to achieve zero energy buildings in cold climate conditions

This paper aims to perform a comprehensive performance analysis of a solar-assisted ground source heat pump (SAGSHP) system connected to various types of solar panels to enhance overall energy efficiency. While previous studies have examined integrating solar panels with heat pumps, comprehensive solutions like those presented here and performance evaluations in the zero energy building context have been lacking. This study developed various scenarios using three types of solar panels, photovoltaic (PV), photovoltaic-thermal (PVT), and solar thermal collectors (ST), to explore their simultaneous use. TRNSYS software was employed to analyze the complex system, comparing it to a conventional natural gas boiler system as a baseline. The findings revealed that the on-site energy use intensity (EUI) decreased from 78.6 kWh/m2 to 53.3 kWh/m2, a reduction of approximately 33 %, due to the SAGSHP's implementation. The combination of PVT and PV panels emerged as the most suitable option for the SAGSHP, aligning with the net zero energy concept. The SAGSHP system achieved a low EUI of 10.4 kWh/m2 in terms of primary energy. Additionally, the solar fraction, indicating the proportion of solar energy used, reached approximately 90 %. Thus, this study underscores the significance of evaluating various solar panel configurations during the preliminary design phase of SAGSHP systems to optimize energy performance and progress toward zero energy buildings.

Broad-spectrum anti-cancer activity of fused human arginase variants.

The rapid increase in cancer cases worldwide necessitates the development of novel therapeutic approaches. Therapies targeting cancer's altered metabolism, especially those that deplete critical amino acids, have emerged as promising ones, some of which are already being used in clinical practice and many others are under development. This study reports the anti-cancer activity of two novel fused human arginase I (FHA) variants, FHA-3 and FHA-12, assessed using the NCI-60 human tumor cell line panel. Both variants have demonstrated a range of potencies in a single-dose assay (10µM), but FHA-3 was found to be more potent with significant growth inhibition in most tested cell lines.To calculate 50% growth inhibition (GI50), FHA-3 was further evaluated in a five-dose assay, where notable anti-cancer activity was observed across the nine cancer types of the NCI-60 panel. Our results demonstrated the broad-spectrum anti-cancer activity of novel FHA variants, with FHA-3 being the most potent. Further studies elucidating its efficacy in animal models will help explore its therapeutic potential.

Conceptual Design of Compliant Structures for Morphing Wingtips Using Single-Row Corrugated Panels

Morphing wingtips have the potential to improve aircraft performance. By connecting the wingtips and the wings with a compliant structure, a continuous aerodynamic surface can be achieved for a better aerodynamic performance. However, how to maintain the shape-changing capability while keeping a high stiffness to carry aerodynamic loads is a key problem. In this paper, based on asymmetric stiffness, a type of single-row corrugated panel is designed to satisfy the limited space around the wingtip. A finite element model of the single-row corrugated panels is established, and parameter analysis is performed to investigate the impact of the thickness characteristics of the corrugated panel on the folding angle. The corrugated panel is then optimised to find the maximum folding angle. Based on the optimisation results, corrugated panels with asymmetric and symmetric stiffness are fabricated and tested. The results demonstrate that the asymmetric stiffness corrugated panels have the capability to increase the wingtip folding angle.

Blast resistance of 3D-printed Bouligand concrete panels reinforced with steel fibers: Numerical investigations

3D-printed concrete structures inspired by Bouligand architecture with helically twisted sequences exhibit excellent mechanical performance owing to its aligned fiber orientation. In this study, 3D-printed concrete panels with different numbers of layers (five, ten, and 15 layers) and spiral angles (0°, 15°, 30°, and 45°) are designed for numerical investigations of their blast-resistant capacity. A multi-scale model is developed to capture the isotropic and anisotropic properties of the fiber-concrete composite. The adequacy and accuracy of the model are evaluated and validated by experimental data in the literature. Blast resistance of different types of panels in terms of time histories of central-point deflection, contact explosion-induced plastic dissipation energy, stress propagation, and principal stress distribution is examined. It is found that extrusion-based concrete panels with aligned fiber orientation substantially enhance the blast resistance compared to traditional cast concrete panels with random fiber orientation. Furthermore, more layers of printed concrete panels prove to be more efficient in filtering blast waves. In particular, shifting a pitch angle of 30° after printing each layer plays an important role in reducing the maximum deflection. Meanwhile, 3D-printed concrete panels with a pitch angle of 0° can better mitigate blast-induced damage. Through parametric studies, the intrinsic mechanism of steel fibers aligned in 3D-printed panels is numerically analyzed to support the conclusions.

Numerical Analysis of the Dynamic Properties of Bionic Raster Ceilings.

In this study, a numerical dynamic analysis of ceiling raster panels was performed. The analysis was conducted on panels designed with inspiration from bionics. The purpose of the analysis was to enable optimisation of the location of the holes in the designed slabs in order to achieve the preferred dynamic properties, including the natural frequencies of the slabs and an appropriate airflow to avoid the occurrence of resonance. Three different types of panels were used and a total of fifteen panels were designed in terms of their geometry, with circular, elliptical, and hexagonal perforations, made of different materials: polypropylene PP, wood, and aluminium. Then, using the finite element method and ANSYS 2023 R1 software, the airflow over the ceiling panels and their natural frequencies and vibration modes were analysed. The analysis took into account not only the shape of the openings, but also their percentage area relative to the total panel area and different airflow velocities. In addition, the results were compared in an analytical way with those obtained for a solid slab. The results obtained include findings on the mode shapes and values of the vibration frequencies of the plates, air pressure maps, histograms, and plots of the pressure dependence on the surface area of the plate openings.

Crushing behavior and energy absorption of steel-GFRP-foam sandwich structures under quasi-static compression: Experimental and theoretical study

To overcome the poor energy-absorbing efficiency of existing layered panels, three kinds of novel steel-glass fiber reinforced polymer (GFRP)-foam sandwich structures composed of two steel face sheets and GFRP-foam composite cores were proposed in this paper. The effect of the composite core thickness and GFRP lattice configuration on the energy absorption performance for sandwich structures was studied through quasi-static crushing tests. Considering the role of steel face sheets, a theoretical prediction model was derived to calculate the initial absorbed energy for all types of sandwich panels. Parametric studies were carried out to investigate the influence of five different variables (axial compressive load, steel sheet thickness, GFRP web thickness, GFRP and foam compressive modulus) on the overall energy dissipation for each kind of composite panel. Test results indicated that both the thicker core component and double-layered dislocation GFRP layout could effectively promote the energy consumption property of all the steel-GFRP-foam structures, and the steel face sheet played a crucial role in the proposed sandwich panels due to its excellent absorbed-energy capacity per volume and exceptional ductility. Theoretical results demonstrated that the equivalent energy-absorbing formula was desirable to be used to assess the crushing resistant behavior of each sandwich structure. Parametric analysis results showed that a larger axial compressive load was able to improve the structural initial energy absorption, but the increase of four other structural parameters, especially the thickness of the front (rear) steel sheet, could weaken such an identical performance.

Experimental and numerical studies on buckling and post-buckling behavior of T-stiffened variable stiffness panels

Currently, experimental research on variable stiffness design mainly focuses on laminates. To ensure adaptability in practical application, it is imperative to conduct a systematic study on stiffened variable stiffness structures, including design, manufacture, experiment, and simulation. Based on the minimum curvature radius and process schemes, two types of T-stiffened panels were designed and manufactured. Uniaxial compression tests have been carried out and the results indicate that the buckling load of variable stiffness specimens is increased by 26.0%, while the failure load is decreased by 19.6%. The influence mechanism of variable stiffness design on the buckling and failure behavior of T-stiffened panels was explicated by numerical analysis. The primary reason for the reduced strength is the significantly increased load bearing ratio of stiffeners. As experimental investigations of stiffened variable stiffness structures are very rare, this study can be considered a reference for future work.

Characteristic Study of a Typical Satellite Solar Panel under Mechanical Vibrations.

As the most common energy source of spacecraft, photovoltaic (PV) power generation has become one of the hottest research fields. During the on-orbit operation of spacecraft, the influence of various uncertain factors and the unbalanced inertial force will make the solar PV wing vibrate and degrade its performance. In this study, we investigated the influence of mechanical vibration on the output characteristics of PV array systems. Specifically, we focused on a three-segment solar panel commonly found on satellites, analyzing both its dynamic response and electrical output characteristics under mechanical vibration using numerical simulation software. The correctness of the simulation model was partly confirmed by experiments. The results showed that the maximum output power of the selected solar panel was reduced by 5.53% and its fill factor exhibited a decline from the original value of 0.8031 to 0.7587, provided that the external load applied on the panel increased to 10 N/m2, i.e., the vibration frequency and the maximal deflection angle were 0.3754 Hz and 74.9871°, respectively. These findings highlight a significant decrease in the overall energy conversion efficiency of the solar panel when operating under vibration conditions.

Cumulative energy demand and environmental impact analysis in the manufacture of recycled fiber reinforced composites panels for use in truck bodies

ABSTRACT The reuse of fiber-reinforced composite materials has become increasingly important with the tremendous waste produced by aerospace, wind turbine blades, and automobile components. Recycling fiber-reinforced composites from parts at their end-of-life provides the benefit of reinforcing strength and integrity. The life cycle assessment (LCA) method has been widely used to examine the embodied energy (EE) and the environmental impact of the manufacturing process. Two different types of composite panels made via hand layup and compression molding are considered for a comparative LCA investigation using SimaPro software. Some panels are made with a mixture of 50% virgin glass fiber (GF) and 50% polyester resin. Others are produced with a mixture of 25% virgin GF, 25% shredded recyclates from wind turbine blade, and 50% of polyester resin. Panels from the recyclates termed Recycled Glass Fiber Reinforced Polyester (rGFRP) had 2.44% lower EE as compared to their counterparts vGFRP. Ozone depletion proved to be the greatest impact on the environment as regard to the manufacturing of rGFRP (4.38E–6 kg CFC-11eq). rGFRP panels manufacture generated 3.8% less greenhouse gas emissions than the vGFRP. LCA analysis suggests that the manufacture of panels for truck body/floor using recyclates from shredded wind turbine blades involves less energy use and has less environmental impact.

Efficient Modeling of Ship Structure Based on Image Recognition and Data Retrieval

In order to significantly improve the efficiency of ship structure modeling, an efficient ship structure modeling method based on image recognition and data retrieval is proposed. First of all, the typical Panel has been designed, according to specific data standards, the data and drawings are saved to the database. Then when a new Panel needs to be created, compare the 2D drawings of the structure around the Panel through image recognition to get a similar structure and confirm which Panel's script file in the database is used. Finally, using the standard numbering method, the mapping relationship between the original Panel and the target Panel topology objects and the transformation logic of coordinate data are calculated, and then the target Panel script file is generated. This is the method of efficient modeling in this paper.

Properties of patula pine plywood using phenolic resin-impregnated veneers

Having observed the need for structural panels for external use, it is important to study methods of treating wood from new forest species, with less harmful products. In this sense, veneers of Pinus patula wood were subjected to immersion treatment in phenolic resin diluted in water at 5% solids content for one minute, and subsequently used to produce plywood panels using phenol-formaldehyde resin, with a weight of 160 g /m² in single line. The experimental design included four types of panels: fresh veneers glued with 35% resin solids content, treated veneers glued with 12%, 23% and 35% resin solids content. The physical-mechanical properties of the panels were compared with the parameters defined by the Brazilian Association of the Mechanically Processed Wood Industry (ABIMCI) and the Brazilian Association of Technical Standards (ABNT). The panels produced presented apparent density and bonding quality results below the minimum recommendations established in these technical parameters, in addition to water absorption higher than the values found in research with other pine species. However, veneer panels treated with phenolic resin showed better bonding quality than untreated panels for the same resin solids content. In less severe conditions, such as in the wet bonding test, the use of 23% resin solids content maintained bonding quality compared to 35% untreated wood. Therefore, further studies are suggested on the use of wood veneers treated with phenol and to reduce the resin solids content for to reduce costs and harmful effects on the environment.

Exploring the potential of recycled polypropylene-waste jute fiber composites for sound insulation: An experimental and theoretical analysis

This study explores the potential of panels made from Recycled Polypropylene (RPP) and Waste Jute Fiber (WJF) for sound insulation applications. Two types of panels were fabricated by the compression molding process: Neat RPP and a composite of RPP reinforced with a WJF interlayer (RPP/WJF/RPP). The physical properties, namely density and mechanical properties, such as tensile strength and modulus, were examined for both panels. The vibration properties of the panels were evaluated through a modal analysis conducted according to ASTM E756-05 guidelines, while sound insulation was assessed by measuring normal incidence sound transmission loss (STL) using a four-microphone impedance-tube setup following ASTM E2611-19 standards. The RPP/WJF/RPP composite, with a density of 913 kg/m³, is 2.47% higher than that of Neat RPP, which is 891 kg/m³, and exhibited an increased tensile strength of 12.01 MPa, compared to 10.03 MPa for Neat RPP. In the second vibration mode, the composite's damping ratio of 3.62% outperformed Neat RPP's 2.48%. Furthermore, the composite's measured average STL was 38.6 dB, exceeding the Neat RPP's average of 37.7 dB. This enhancement in STL is likely attributed to the composite's higher surface density (5.21 kg/m²) relative to Neat RPP (4.72 kg/m²), contributing to its improved sound insulation properties. The theoretical average STL values, predicted using the Mass