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Techno economic and environmental analysis of green hydrogen generation with hybrid PV/Wind systems in southern provinces of Oman

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Interactions 2025年第1期246卷 1-14页

作者： Gopinath, Arun S. Al Quri, Khalifa Kalyan Kumar, B. Boddu, Muralikrishna Santhappan, Joseph Sekhar Engineering Department University of Technology and Applied Sciences Shinas Oman Engineering Department University of Technology and Applied Sciences Musandam Oman

The use of renewable energy resources is becoming increasingly critical for a sustainable power generation scenario on a global scale. Solar photovoltaics and wind are the most prominent potential renewable sources in Oman, according to the studies conducted in the zone. Various locations in Oman behaved differently depending on the region’s potential energy source. For instance, the Dhofar region has an annual average global horizontal irradiance of 6.1 kWh/m2/day and a wind speed of 5.9 m/s at a 10-meter anemometer height from the ground, respectively. The intermittency of renewable sources and the need for reliability in power systems lead to battery energy storage requirements. This study establishes the optimal hybrid system rating for a community load of 24.57 kW, considering multiple system configurations and producing 11.27 kg of hydrogen daily. Since renewable energy must replace fossil fuels in microgrids, this study compares the results with diesel generator-based systems. The study employs several criteria to identify the optimal solution, including meeting the load potential, minimizing the levelized cost of energy (LCOE), minimizing the levelized cost of hydrogen (LCOH) generation, calculating the net present cost, and calculating the CO2 emissions. The study region achieves a renewable energy fraction of more than 85%, with an LCOE of 0.421 $/kWh and an LCOH of 4.65 $/kg. Furthermore, we observed that the region has a high potential for green hydrogen generation, which can meet the country’s aim to improve the ratio of renewables in total energy supply and achieve sustainable development goals. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2025.

关键词： Clean energy

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Effects of bidirectional interaction on inelastic seismic response:When is its effect significant?

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Earthquake engineering and engineering Vibration 2025年第1期24卷 113-134页

作者： Atanu Santra Rana Roy Department of Aerospace Engineering and Applied Mechanics Indian Institute of Engineering Science and TechnologyShibpur 711103India

Motivated by the early works on bidirectional interaction and the breakthrough to estimate seismic response to bidirectional shaking via unidirectional analysis,it is essential to answer the question:When is the interaction effect significant?Early works concluded that the effect of interaction is pronounced for stiff systems;consequently,the straightforward method for estimating seismic response to bidirectional excitation by using unidirectional analyses is verified primarily for short period ***,it is essential to identify the domain of significance for bidirectional interaction before adopting this simple methodology in *** parametrically defined systems with elastoplastic and degrading hysteresis models are studied under near-fault motions,assuming strength-independent and strength-dependent *** force-based and displacement-based analyses,conducted in parallel,reveal that the interaction effect is considerable for stiff systems,especially with degrading characteristics in a relatively low inelasticity ***,the bidirectional effect may be significant even for highly flexible systems,especially for residual deformation,which in earlier works was *** range of significance depends on the hysteresis model,system parameters,and response *** analysis is carried out with the results of the case studies,and the derived regression models may be used for a preliminary assessment of the impact of interaction in advance.

关键词： bidirectional residual forward-directive fling force-based displacement-based regression

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A Proximity-Fed Multi-Band Printed Antenna for Wireless Communication Applications

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Progress In Electromagnetics Research C 2024年 145卷 153-165页

作者： Salim, Ali Jabbar. Mohammed, Jabbar K. Al-Saedi, Hussam Ali, Jawad K. Applied Electromagnetic Research Group Department of Communication Engineering University of Technology Iraq Department of Electrical Engineering University of Technology Iraq

This paper introduces a new triple-band antenna driven indirectly by a feed line for multiple wireless applications. The structure of this antenna is based on the creation of a set of slots and slits on the ground plane mounted on a substrate with relative permittivity of 4.4 and thickness of 1.6 mm. On the other hand, a 50-ohm microstrip feed line has been fixed. It is found that the proposed antenna offers a triple-band fashion with −10 dB impedance bandwidths suitable for most recent wireless applications. The first band extends from 1.6 GHz to 2.8 GHz, which covers LTE bands (1, 2, 3, 4, 9, 10, 23, 24, 25, 33, 34, 35, 36, 37, 39 and 40), 2.4 GHz-Bluetooth, and 2.45 GHz ISM. The second band extends from 3.38 GHz to 3.6 GHz, which covers most WiMAX applications, while the third band reconciles 5.8 GHz-ITS and 2.4/5.8 GHz-WLAN. A prototype of the proposed antenna has been successfully simulated, fabricated, and measured. © 2024, Electromagnetics Academy. All rights reserved.

关键词： Microstrip antennas

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A parametric examination of the energetic, exergetic, and environmental performances of the geothermal energy-based multigeneration plant for sustainable products

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International Journal of Hydrogen Energy 2024年 143卷 947-957页

作者： Yilmaz, Fatih Ozturk, Murat Selbas, Resat Isparta University of Applied Sciences Faculty of Technology Department of Mechatronics Engineering Isparta Turkey Isparta University of Applied Sciences Faculty of Technology Department of Mechanical Engineering Isparta Turkey

Geothermal energy is one of the most reliable sources of environmentally friendly energy. In this research, an advanced combined geothermal power plant is not just planned, but thoroughly examined using a comprehensive set of evaluation approaches including thermodynamic, environmental, and exergo-environmental. This system comprises a geothermal cycle, two ORCs with Ammonia fluid, a PEM electrolyzer, an Ammonia synthesis module, and a reverse osmosis desalination. This newly developed configuration can produce clean electricity, green hydrogen, ammonia, freshwater, and heating. To determine the cycle performance and relationship between exergy destruction and the environment, various analyses, which are energetic and exergetic performance, exergy destruction rate, carbon-dioxide emission reduction rate, and environmental index evaluation, are conducted parametrically. The examination results illustrate that the net electricity capability of the modeled plant is 2046 kW. Afterwards, 0.002367 kgs−1 green Hydrogen and 0.009436 kgs−1 ammonia can be produced with this designed system. A total of 4945 kW exergy destruction is observed in this designed system. Additionally, the newly configured cycle has an energetic performance of 26.31% and an exergetic performance of 33.09%. Overall, the comprehensive evaluation of the system instills confidence in its reliability and potential for further carbon dioxide emission reductions. © 2024 Hydrogen Energy Publications LLC

关键词： Desalination

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An innovative deep learning method for IoT malware identification

Mari Papel y Corrugado

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Mari Papel y Corrugado 2025年第1期2025卷 29-37页

作者： Zhang, Yan Department of Information Engineering Shijiazhuang University of Applied Technology ShiJiaZhuang050000 China

In the realm of information security, malware detection in IoT environments is crucial. This research proposes a heterogeneous graph network based malware classification model to enhance the detection and categorization of sophisticated malware samples. The model is composed of five primary modules: a module for building heterogeneous graphs;a module for generating random wandering sequences;an aggregation module based on LSTM;a module for wandering based on attention mechanisms;and a module for classification and prediction. Initially, a heterogeneous graph comprising API and malware nodes is built, and using random wandering, the associations between far-off nodes are obtained to improve the representation of node features. Next, using the attention mechanism, LSTM is utilized to aggregate the data of nodes on various paths, learn how different paths affect nodes, and ultimately output the node categorization results through the linear layer. The model performs better in terms of precision, recall, and F1 value than conventional techniques like Node2Vec, GCN, and GraphSAGE, according to the trials done on the APIMDS and Mal-API-2019 datasets. Furthermore, by inserting, removing, and changing pointless API calls, robustness tests are carried out to confirm the model’s resilience to malware variants. © The authors.

关键词： Deep learning

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Study on intelligent control method of pharmaceutical production quality based on chromatographic fingerprint

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International Journal of Manufacturing technology and Management 2025年第1-2期39卷 152-167页

作者： Zhang, Liyuan Yang, Yong Wang, Xuefeng Department of Food and Drug Engineering Shijiazhuang University of Applied Technology Shijiazhuang050081 China Department of Student Affairs Shijiazhuang University of Applied Technology Shijiazhuang050081 China

Aiming at the problems of low control accuracy and long control time in traditional intelligent control methods of drug production quality, an intelligent control method of drug production quality based on chromatographic fingerprint was proposed. Extract the chromatographic fingerprint of drug production quality, and use wavelet transform to de-noise the obtained fingerprint. According to the preprocessing results, use the real-time mean method to calculate the mean value of the real-time converted chromatographic fingerprint data. Through the tolerance zone of the fingerprint, convert the drug chromatographic fingerprint data. Based on the data conversion results, grade the drug production quality through fuzzy classification. The interval hesitation fuzzy control chart is constructed to carry out intelligent control of drug production quality. The experimental results show that the proposed method has higher precision and shorter control time for drug production quality intelligent control. © 2025 Inderscience Enterprises Ltd.

关键词： Fuzzy control

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Bioinspired 3D flexible devices and functional systems

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National Science Review 2024年第3期11卷 271-295页

作者： Xu Cheng Zhangming Shen Yihui Zhang Applied Mechanics Laboratory Department of Engineering Mechanics Tsinghua University Laboratory of Flexible Electronics Technology Tsinghua University

Flexible devices and functional systems with elaborated three-dimensional(3D) architectures can endow better mechanical/electrical performances, more design freedom, and unique functionalities, when compared to their two-dimensional(2D) counterparts. Such 3D flexible devices/systems are rapidly evolving in three primary directions, including the miniaturization, the increasingly merged physical/artificial intelligence and the enhanced adaptability and capabilities of heterogeneous *** challenges exist in this emerging research area, such as relatively poor controllability in the locomotion of soft robotic systems, mismatch of bioelectronic interfaces, and signal coupling in multi-parameter sensing. By virtue of long-time–optimized materials, structures and processes, natural organisms provide rich sources of inspiration to address these challenges, enabling the design and manufacture of many bioinspired 3D flexible devices/systems. In this Review, we focus on bioinspired 3D flexible devices and functional systems, and summarize their representative design concepts, manufacturing methods, principles of structure-function relationship and broad-ranging applications. Discussions on existing challenges, potential solutions and future opportunities are also provided to usher in further research efforts toward realizing bioinspired 3D flexible devices/systems with precisely programmed shapes,enhanced mechanical/electrical performances, and high-level physical/artificial intelligence.

关键词： bioinspired designs biomimetic 3D structures 3D flexible electronics 3D functional systems direct 3D manufacture 2D-to-3D assembly

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Numerical analysis of moving train induced vibrations on tunnel,surrounding ground and structure

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Earthquake engineering and engineering Vibration 2024年第1期23卷 179-192页

作者： Swati Srivastav Sowmiya Chawla Swapnil Mishra Department of Applied Geophysics Indian Institute of Technology(ISM)Dhanbad 826004India Department of Civil Engineering Indian Institute of Technology(ISM)Dhanbad 826004India Department of Mining Engineering Indian Institute of Technology(ISM)Dhanbad 826004India

This study is focused on the effect of vibration induced by moving trains in tunnels on the surrounding ground and structures.A three-dimensional finite element model is established for a one-track railway tunnel and an adjacent twelve-storey building frame by using commercial software Midas GTS-NX(2019)and Midas *** study considered the moving load effect of a complete train,which varies with space as well as with *** effect of factors such as train speed,overburden pressure on the tunnel and variation in soil properties are studied in the time *** a result,the variations in horizontal and vertical acceleration for two different sites,i.e.,the free ground surface(without structure)and the area containing the structure,are ***,the displacement pattern of the raft foundation is plotted for different train *** lower speeds,the heaving phenomenon is negligible,but as the speed increases,both the heaving and differential settlement increase in the *** study demonstrates that the effect of moving train vibrations should be considered in the design of new nearby structures and proper ground improvement should be considered for existing structures.

关键词： moving train load tunnels vibration effect finite element method(FEM) wave propagation

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Novel methods for optimizing CNC aluminum alloy machining parameters in polymer mold cavities

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International Journal of Lightweight Materials and Manufacture 2024年第4期7卷 507-519页

作者： Ikhries, Ibrahim I. Al-Shawabkeh, Ali F. Department of Mechanical Engineering Faculty of Engineering Technology Al-Balqa Applied University Amman11134 Jordan Department of Scientific Basic Sciences Faculty of Engineering Technology Al-Balqa Applied University Amman11134 Jordan

The examination of the machining of 7075-T6 aluminum alloy polymer mold cavities using Taguchi optimization and analysis of variance is presented in this paper. This study identified the best CNC milling cutting parameters and used a mathematical model to quantify the surface roughness of the machined cavities. The findings showed that while using a flat endmill, the spindle speed multiplied by feed rate contributed 28.01% to surface roughness, and when using a ball endmill, the squared depth of cut contributed 41.27%. Using both flat and ball endmills, the depth of the cut contributed 98.53% to the material removal rate. A refined second-order linear regression model was employed to forecast the endmill-machined surface roughness. The Warp Surf Portable tester measured values that were outside the error range of approximately 0.257% and 2.8%, respectively, for the expected values. Surface roughness has a 99.97% correlation coefficient in the regression model, indicating a very significant link. Additionally, the study improved the cutting parameters for a ball endmill, which were 3005 Rpm, 726.7 mm/min, and 0.43 mm, and for a flat endmill, these were spindle speed (2500 Rpm), feed rate (650 mm/min), and axial cut depth (0.5 mm). The outcomes demonstrated how well the techniques enhanced mold cavity machining and cost estimation using Ra and MRR data. Consequently, these results can be applied to future academic studies and industrial applications. © 2024 The Authors

关键词： Surface roughness

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A Compact Dual-Band Dual-Polarized Antenna Based on Modified Minkowski Fractal

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Progress In Electromagnetics Research C 2024年 140卷 11-19页

作者： Yassen, Mahmood T. Salim, Ali J. Hussan, Mohammed R. Ali, Jawad K. Microwave Research Group Department of Electrical Engineering University of Technology Iraq Applied Electromagnetic Group Department of Communication Engineering University of Technology Iraq

The polarization of the received signals can be effectively matched regardless of the orientation of the receiving antenna using circularly polarized antennas. A compact printed monopole antenna with a circular ring patch is presented in this paper. The proposed antenna will be able to provide two polarization states: linear and circular. The employment of a modified Minkowski fractal with 1st iteration construction on an open circular ring supports a circularly polarized band having a center frequency of 1.812 GHz and fractional bandwidth (FBW) of 20.033%. The upper band is achieved with a linearly polarized wave having a center frequency of 3.386 GHz and a fractional bandwidth of 11.399%. The proposed antenna is fed by an ungrounded co-planar waveguide (UCPW), enhanced with an impedance transformer to match at 50 Ohms with the characteristic impedance. The ground planes around the feed line are defected by ground structures to improve the antenna gain. The fabrication and measurement of the proposed antenna prototype are presented to validate the theoretical results. Measured results support the theoretical findings well. © 2024, Electromagnetics Academy. All rights reserved.

关键词： Receiving antennas

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