Arabian Journal for Science and Engineering最新文献

{"title":"Chaos in Bitcoin Cryptocurrency Metrics: Analysis and Forecasts","authors":"Ali Gezer","doi":"10.1007/s13369-024-09357-z","DOIUrl":"10.1007/s13369-024-09357-z","url":null,"abstract":"<div><p>Cryptocurrencies, particularly Bitcoin have attracted a lot of attention in the last decades of humanity. Analyzing cryptocurrencies algorithmic differences, chaotic behavior and self-similarity in cryptocurrency metrics might give significant insights for identifying risks and opportunities. Determining the degree of chaos in crypto metrics is critical for understanding complexity, improving prediction capabilities, and supporting decision-making. This study focuses on the analysis of chaos and self-similarity in Bitcoin dynamics for predictability perspective. Return, rate of return and volume quantities in different scales are analyzed with using rescaled range method to reveal the degree of self-similarity. Hurst parameter extracts a comprehensive summary providing information on how current values depend on previous ones to reveal any persistence in Bitcoin metrics. Daily rate of return and return give Hurst degree around 0.64 while they are in between 0.52–0.55 for minutely and hourly based prices. However, an increasing persistence is observed with the increasing time window. Although the largest Lyapunov exponents stay in the positive region for prices and returns of Bitcoin, they are approximately zero for inspected statistics. Periodic characteristics of Bitcoin are also investigated to reveal any dependencies on halving mechanism of Bitcoin. Detailed self-similarity analysis on specific periods shows that bull and bear market seasons don’t make any significant effect on the degree of Hurst parameter. Due to nonlinear and unpredictable characteristics of Bitcoin metrics, distribution fittings are applied to characterize BTC return and rate of return. While Wakeby distribution gives best fitting for daily return, Cauchy distribution gives best for hourly returns.</p></div>","PeriodicalId":54354,"journal":{"name":"Arabian Journal for Science and Engineering","volume":"50 8","pages":"5869 - 5884"},"PeriodicalIF":2.6,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13369-024-09357-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143856461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Model-Free Predictive Control based on the Execution Time of Active Vectors Using Ultra-Local Model","authors":"Zakaria Lammouchi,&nbsp;Mohamed Naoui,&nbsp;Youcef Bekakra,&nbsp;Abderrahmane Khechekhouche,&nbsp;Lassaad Sbita","doi":"10.1007/s13369-024-09629-8","DOIUrl":"10.1007/s13369-024-09629-8","url":null,"abstract":"<div><p>Model-free predictive control based on the execution time of active vector (ETAV-MFPC) is proposed in this paper, and the traditional model-free predictive control uses the entire sampling period time with all candidate voltage vectors according to the principle of minimizing the cost function. The delay problem in the predictive controller may degrade the controller's performance. With the proposed control, the optimal vector is chosen only during the execution time of the active vector, which solves the delay problem which reduces the resulting current ripple and lower harmonics. The execution time is calculated using the ultra-local model (ULM) equation. In this work, the unknown part in ULM is estimated by the integrated sliding mode observer (ISMO) with an enhanced design to reduce the chattering phenomenon. The simulation results confirm the efficacy of the proposed ETAV-MFPC method for output current, demonstrating reduced current ripples and enhanced current quality.</p></div>","PeriodicalId":54354,"journal":{"name":"Arabian Journal for Science and Engineering","volume":"50 8","pages":"5885 - 5898"},"PeriodicalIF":2.6,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143856460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the Evolution of Rock Pore Pressure Under Microwave Irradiation","authors":"Yang Xiang,&nbsp;Yang Li,&nbsp;Jiahao Wang,&nbsp;Zixian Guo,&nbsp;Jingcheng Li","doi":"10.1007/s13369-024-09687-y","DOIUrl":"10.1007/s13369-024-09687-y","url":null,"abstract":"<div><p>Microwave-assisted rock-breaking technology is a promising and innovative technique with significant potential for engineering applications. To delve into the variations in rock pore pressure after microwave irradiation, this study employs the theory of wet porous media as the foundation, using numerical simulations to analyze the evolution of pore pressure in different conditions. The research findings indicate that oil-based drilling fluids have a comparably lower influence on the effectiveness of microwave irradiation in comparison with water-based drilling fluids. Additionally, the high conductivity of a medium substantially impacts the irradiation efficacy of microwaves. Basalt exhibits superior microwave absorption and reflection properties compared to granite, limestone, and shale. Consequently, it demonstrates the highest pore pressure, while shale follows with the most rapid decrease in electric field intensity owing to its elevated conductivity. The water vapor pressure escalates with rising rock porosity. Diverse irradiation distances alter the electric field distribution pattern, resulting in various temperature hotspots on the heating surface. Optimal irradiation distances are 10 cm or 16 cm. Additionally, as microwave power rises and irradiation time lengthens, the water vapor pressure inside the rocks intensifies. The irradiation time should be selected to range from 60 to 80 s to avoid evaporative saturation phenomena, which lead to microwave energy loss. Upon microwave irradiation, the pore pressure within rocks may elevate to 4 MPa, inducing a localized imbalanced state at the irradiated surface. This results in a decrease in the rock’s triaxial strength, thereby effectively improving the rock-breaking efficiency of the drill bit.</p></div>","PeriodicalId":54354,"journal":{"name":"Arabian Journal for Science and Engineering","volume":"50 7","pages":"5157 - 5174"},"PeriodicalIF":2.6,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143688408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improved Electrochemical Performance of Co3O4 Incorporated MnO2 Nanowires for Energy Storage Applications","authors":"Md. Hasive Ahmad,&nbsp;Md. Roxy Islam,&nbsp;Muhammad Rakibul Islam","doi":"10.1007/s13369-024-09421-8","DOIUrl":"10.1007/s13369-024-09421-8","url":null,"abstract":"<div><p>In this paper, cobalt oxide incorporated manganese dioxide nanowires (α-MnO₂@Co₃O₄) have been synthesized by a facile hydrothermal method. The surface morphological, structural, chemical bonding, and electrochemical properties of α-MnO₂@Co₃O₄ at different concentrations (1, 3, 5, 7 wt%) Co₃O₄ nanoparticles (NPs) were studied. The morphological analysis reveals that the Co₃O₄ nanoparticles are attached to the surface of randomly oriented MnO₂ nanowires. The surface chemical state investigation reveals the formation of oxygen vacancy in the nanocomposite (NC) due to the incorporation of Co₃O₄ NPs. Incorporation of Co₃O₄ was also found to improve the electrochemical performance of the nanocomposite. The hydrothermally produced α-MnO₂@Co₃O₄ nanocomposite exhibits the highest specific capacitance of 654.57 Fg⁻¹ at a current density of 0.15 Ag⁻¹. The unique structure and the presence of oxygen vacancy of the hetero-structured α-MnO₂@Co₃O₄ electrode enable rapid electron and ion transport, resulting in improved capacitive performance. The distinctive α-MnO₂@Co₃O₄ nanocomposite may offer a novel route for advanced energy storage applications.</p></div>","PeriodicalId":54354,"journal":{"name":"Arabian Journal for Science and Engineering","volume":"50 1","pages":"583 - 596"},"PeriodicalIF":2.6,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142925776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An Improved Probabilistic Collocation Method for Uncertainty Quantification of Oil–Water Transport through Fractured Porous Media: Effect of Uncertain Gravity Imbibition","authors":"Mohammad Sadegh Sharafi,&nbsp;Mohammad Ahmadi,&nbsp;Alireza Kazemi","doi":"10.1007/s13369-024-09665-4","DOIUrl":"10.1007/s13369-024-09665-4","url":null,"abstract":"<div><p>Simulation of subsurface flow through fractured media is significantly influenced by uncertainty in matrix block size, fracture aperture and fracture distribution due to inherent heterogeneity. In recent years, probabilistic collocation method (PCM) has emerged as a precise approach for quantifying uncertainty. However, computing uncertainty propagation during simulation of unsteady multiphase transport in porous media could not be performed through previous PCM-based studies or even Monte Carlo simulation. Therefore, this study introduces an innovative numerical modeling framework that improves PCM on sparse grids and integrates it with Smolyak procedure to generate collocation points sets, Karhunen–Loeve and polynomial chaos expansions to assess the uncertainty associated with oil–water flow through fractured media with consideration of gravity imbibition force. By coupling developed numerical framework and solving deterministic equations, uncertainty propagation from initial time-step to final time-step of simulation is computed and the effect of uncertainty in vertical dimension of matrix blocks, a parameter with significant role in gravity imbibition and commonly subject to uncertainty and history matching, on simulation outputs of randomly synthesized 3D porous media is quantified. The confidence interval and aggregated uncertainty in ultimate production are computed, and at each time-step, statistical moments of simulation outputs are obtained. The findings demonstrate that proposed model effectively quantifies uncertainty while significantly reducing CPU time compared to Monte Carlo simulation.</p></div>","PeriodicalId":54354,"journal":{"name":"Arabian Journal for Science and Engineering","volume":"50 7","pages":"5135 - 5156"},"PeriodicalIF":2.6,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143688403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and Implementation of a New Method for Producing Transverse OAM with Metamaterial Antenna Structure","authors":"Amir Habibi Daronkola,&nbsp;Farzad Tavakol Hamedani,&nbsp;Pejman Rezaei","doi":"10.1007/s13369-024-09659-2","DOIUrl":"10.1007/s13369-024-09659-2","url":null,"abstract":"<div><p>Planar spiral orbital angular momentum (PSOAM) waves offer a promising solution to the inherent challenges of long-distance OAM-based communications. Traditional OAM-based communications face challenges such as low data rate, sensitivity to atmospheric turbulence, limited spatial multiplexing capacity, beam divergence due to central zero, and complex and large receiver structures. Although new techniques, such as novel vortex beam generation methods and advanced digital signal processing at the transmitter, and very complex and computationally intensive processing techniques at the receiver, beam focusing techniques, and the Partial Aperture Ratio method have shown improvements in addressing existing challenges, many limitations still persist. To overcome these limitations, this research proposes a new antenna structure based on metamaterials for generating PSOAM waves. A circular array antenna with an almost omnidirectional radiation pattern is designed to generate PSOAM waves with l = 3 and − 3 modes at 3 GHz. The antenna array consists of eight metamaterial antenna elements fed by an 8-port feeding network with a 45° phase difference between adjacent ports. The experimental results show the efficient generation and propagation of PSOAM waves. Remarkably, a signal reduction of 24 dB is observed when the receiver antenna mode is changed from 3 to − 3, which shows the potential of this architecture for robust long-range communication systems.</p></div>","PeriodicalId":54354,"journal":{"name":"Arabian Journal for Science and Engineering","volume":"50 8","pages":"5853 - 5868"},"PeriodicalIF":2.6,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143856573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advancing Nuclear Research and Education in Slovenia and EU: From Operating the TRIGA Reactor to Building a New Generation Facility","authors":"Jan Malec,&nbsp;Iztok Tiselj,&nbsp;Leon Cizelj,&nbsp;Anže Pungerčič,&nbsp;Tanja Goričanec,&nbsp;Luka Snoj","doi":"10.1007/s13369-024-09621-2","DOIUrl":"10.1007/s13369-024-09621-2","url":null,"abstract":"<div><p>The TRIGA Mark II research reactor at the Jožef Stefan Institute in Slovenia achieved first criticality in 1966. Since then, the reactor has been playing an important role in developing nuclear technology. The reactor has been mainly used for research, education of university students, training of operators of the Krško nuclear power plant (start of operation in 1983) and other nuclear specialists, isotope production and beam applications. The reactor is experiencing a high level of activity today, engaging in a diverse range of experiments and studies across reactor physics, environmental research, radiation hardness testing as well training and education. The future of nuclear technology in Slovenia is focused on new NPPs, while the research community is looking forward to a possible new nuclear reactor. The basic initiatives are at a very preliminary stage: the primary choice is dual-core pool-type reactor, with a zero-power core and a separate MW-size core, cooled and moderated with light water. Such a dual-core configuration is designed to meet the varied requirements of the European Union member states. Another option would be hosting one or more micro-reactors with electrical and/or heating power producing capability that could offer stronger support toward demonstration of prototype small modular reactors in prototype future electrical grids.</p></div>","PeriodicalId":54354,"journal":{"name":"Arabian Journal for Science and Engineering","volume":"50 5","pages":"3519 - 3531"},"PeriodicalIF":2.6,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13369-024-09621-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integration of Geological Model and Numerical Simulation Technique to Characterize the Remaining Oil of Fractured Biogenic Limestone Reservoirs","authors":"Xingchen Yu,&nbsp;Zhihong Kang,&nbsp;Yunpeng Li,&nbsp;Xuechun Lin,&nbsp;Lei Xie,&nbsp;Jiaqi Li","doi":"10.1007/s13369-024-09675-2","DOIUrl":"10.1007/s13369-024-09675-2","url":null,"abstract":"<div><p>Fine geological modeling leads to accurate reservoirs numerical simulations. Fractured biogenic limestone has abundant storage spaces and flow paths to accumulate oil and gas. The complexity and diversity of fractured biogenic limestone also lead to challenges in accurately characterizing its pore volume and remaining oil. This investigation aimed to enhance the understanding of fractured biotite reservoir properties via geological modeling. Numerical simulations were used to characterize the remaining oil during the late stage of field development. Considering the differences in porosity and permeability between fractures and matrix, a facies-controlled stochastic modeling technique was used to establish a dual-porosity and dual-permeability (DPDP) model for numerical simulation. Core information, logging data, and multiple seismic attributes were combined to guide low-level sequence fault interpretation for tectonic refinement. Based on classified seismic inversion, sedimentary phases were reconstructed. A discrete fracture network (DFN) model was obtained based on fracture occurrences and density models. The optimized discrete adjoint (ODA) algorithm was utilized to calibrate model parameters. The findings revealed that dense tectonic fractures develop in thick biogenic limestone areas. Combined with advanced reservoir simulation technology, these findings suggest that areas of thicker biogenic limestone were consistent with areas of higher fracture matrix conductivity multipliers. The remaining oil distribution patterns were investigated, and to deploy new wells was guided. Therefore, it is essential to better understand the tectonic characteristics of fractured biogenic limestone reservoirs and their remaining oil distribution patterns by integrating multiple sources of information and mastering advanced reservoir simulation technology for oilfield development.</p></div>","PeriodicalId":54354,"journal":{"name":"Arabian Journal for Science and Engineering","volume":"50 7","pages":"5117 - 5133"},"PeriodicalIF":2.6,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13369-024-09675-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143688362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impedance Analysis and Dielectric Performance of Microwave-Assisted Synthesized MWCNT/Polystyrene Nanocomposites: Influence of Microwave Power","authors":"Shohreh Jalali,&nbsp;Majid Baniadam,&nbsp;Morteza Maghrebi","doi":"10.1007/s13369-024-09677-0","DOIUrl":"10.1007/s13369-024-09677-0","url":null,"abstract":"<p>This study investigated the enhancement of dielectric properties in multiwalled carbon nanotube (MWCNT)/polystyrene (PS) nanocomposites for potential applications in embedded capacitors. The synthesis of MWCNT/PS nanocomposites was achieved using microwave-assisted in situ polymerization. To provide an exact comparative analysis, a heat-assisted synthesized nanocomposite was also prepared alongside the microwave-assisted samples. This unique feature of this research lies in its comprehensive exploration of how microwave power can affect the morphology, electrical properties, and dielectric characteristics of nanocomposites. In the heat-assisted sample, the MWCNTs lacked a polystyrene layer, and the presence of polymer aggregates was evident, which may be attributed to the random initiation sites for the polymerization reaction in the MWCNT/PS mixture. The microwave-assisted synthesized nanocomposites exhibit a decrease in AC conductivity as the microwave power increases. This is accompanied by an increase in both the real and imaginary impedance. These changes can be attributed to the higher polystyrene content in the nanocomposites, which results in a decrease in conductive pathways. Moreover, the real permittivity decreases as the microwave power increases due to the reduced availability of individual MWCNTs. The observed linear trend in the imaginary permittivity within the low-frequency region underscores the influence of DC conductivity, while the electric modulus analysis highlights the dominance of DC conduction and the absence of relaxation peaks attributable to high conductivity. This study significantly advances the understanding of microwave power's effect on the electrical properties of MWCNT/PS nanocomposites, thereby illuminating their potential applications across various fields.</p>","PeriodicalId":54354,"journal":{"name":"Arabian Journal for Science and Engineering","volume":"50 6","pages":"4283 - 4294"},"PeriodicalIF":2.6,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143581304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biological CO2 Utilization; Current Status, Challenges, and Future Directions for Photosynthetic and Non-photosynthetic Route","authors":"Mutawakkil Isah,&nbsp;Wasif Farooq,&nbsp;Abdul Ahad Khan,&nbsp;Shaikh Abdur Razzak,&nbsp;Umer Zahid,&nbsp;Usama Ahmed,&nbsp;Abdul Gani Abdul Jameel","doi":"10.1007/s13369-024-09601-6","DOIUrl":"10.1007/s13369-024-09601-6","url":null,"abstract":"<div><p>The anthropogenic emission of greenhouse gases (GHGs), especially CO₂, is becoming an economic and societal challenge globally. CO₂ utilization in a closed loop is an essential approach for reducing its greenhouse effects and regulating environmental pollution in a cost- and energy-effective way. On this frontier, chemicals and fuels can be produced from CO₂ as a potential strategy for reducing its emissions. One of the promising and environmentally friendly carbon capture and utilization (CCU) approaches is a biologically mediated method. Numerous microorganisms, such as bacteria, algae, and fungi, have demonstrated the ability to convert CO₂ into a wide range of valuable compounds through various metabolic pathways. These biological processes have shown great potential in achieving high CO₂ conversion efficiencies and generating economically viable products such as bio-alcohols with conversion efficiencies ranging from 50 to 90%. In addition to their high CO₂ conversion efficiencies, biological CO₂ utilization methods also offer advantages in terms of cost-effectiveness. Compared to traditional methods of CCU, biological approaches are generally more economically feasible due to their ability to utilize CO₂ from the atmosphere or flue gas streams, eliminating the need for expensive capture and purification processes. Despite its many advantages, this approach faces a few challenges, such as low fixation rate, lower biomass density, and scale-up. This review details the photosynthetic and non-photosynthetic CO₂ fixation methods, followed by a brief comparison of these two methods and the thermocatalysis process of CO₂ conversion. Also, research progress has been discussed in improving the efficiency and economics of biological CCU processes, such as synthetic biology. Finally, recent developments, challenges, and prospects for future research regarding biological CO₂ conversions were discussed.</p></div>","PeriodicalId":54354,"journal":{"name":"Arabian Journal for Science and Engineering","volume":"50 1","pages":"1 - 28"},"PeriodicalIF":2.6,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142925748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}