Article
Chemistry, Multidisciplinary
Yunhan Yao, Ke Zhang
Summary: In this paper, an improved self-born weighted least square method (ISWLS) is proposed to enhance the stability and resistance to gross errors in geometric error evaluation. By updating the ordinal number information of the independent sets of equations, the influence of gross error data on the solution of the equations is minimized. Experimental results demonstrate the algorithm's strong resistance to gross differences and shorter operation time.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Mechanical
Fei Huang, Alexandre Sava, Kondo H. Adjallah, Zhouhang Wang
Summary: This research introduces a data-driven modeling method for estimating the remaining useful life of bearings using a T-S fuzzy inference system. Parameters of the model are identified through subtractive clustering method, and the maximum likelihood method of mixture distribution analysis is proposed for calculating cluster parameters on the time axis. The effectiveness of the proposed method is highlighted through numerical experiments benchmarked against existing methods.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Mathematics, Applied
Cong Huang, Li Li Chen
Summary: In this paper, a simple weighted essentially non-oscillatory method with adaptive order (SWENO-AO) is proposed, which shows advantages of simplicity, flexibility, and lower computational cost compared to the WENO-AO method.
APPLIED MATHEMATICS AND COMPUTATION
(2021)
Article
Mathematics, Applied
Xiao Ma, Bo Zhou, Shifeng Xue
Summary: In this paper, a meshless Hermite weighted least-square method is developed to improve the accuracy and stability of numerical analysis for piezoelectric structures. The method is proven effective for analyzing piezoelectric structures with various boundary conditions, showing excellent convergence and calculation accuracy.
APPLIED MATHEMATICS AND COMPUTATION
(2021)
Article
Engineering, Multidisciplinary
Xiang Rao, Wentao Zhan, Hui Zhao, Yunfeng Xu, Deng Liu, Weixin Dai, Ruxiang Gong, Fei Wang
Summary: This paper used a meshless method to study water-gas flow in a dual-medium shale gas reservoir model. The method was validated through a numerical reservoir model with a rectangular boundary shape, and parametric analysis was performed to investigate the impact of reservoir physical parameters on shale gas production.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2021)
Article
Materials Science, Multidisciplinary
Anum Shafiq, S. A. Lone, Tabassum Naz Sindhu, Youssef El Khatib, Qasem M. Al-Mdallal, Taseer Muhammad
Summary: This paper aims to identify an effective statistical distribution for examining COVID-19 mortality rates in Canada and Netherlands in order to model the distribution of COVID-19. The modified Kies Frechet (MKIF) model is an advanced three parameter lifetime distribution with versatile probability functions and attractive features, showing good adaptability to data modeling.
RESULTS IN PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Showkat Ahmad Lone, Sadia Anwar, Tabassum Naz Sindhu, Fahd Jarad
Summary: This study discusses the challenge of estimating the parameters of mixture models from a frequentist perspective. It compares the three frequentist approaches, namely maximum likelihood, ordinary, and weighted least squares, and demonstrates the model's applicability through simulated and real-world data, achieving promising results in terms of enhanced estimation.
RESULTS IN PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Qibang Liu, X. J. Xin, Jeff Ma
Summary: This study presents an adaptive coupling of PDLSM with FEM for fracture analysis, which reduces computational cost and has reasonable accuracy and good capability of crack propagation prediction.
INTERNATIONAL JOURNAL OF FRACTURE
(2023)
Article
Mathematics, Applied
Tabassum Naz Sindhu, Zawar Hussain, Naif Alotaibi, Taseer Muhammad
Summary: This study discusses the mathematical characteristics of the Lindley model mixed with 2-component (2-CMLM) and investigates its practical and theoretical aspects. Various statistical features are examined, and the proposed 2-CMLM is shown to outperform other models in modelling COVID-19 patient data.
Article
Environmental Sciences
Bingbing Zhang, Zhengtao Wang, Wang Li, Wei Jiang, Yi Shen, Yan Zhang, Shike Zhang, Kunjun Tian
Summary: Weighted average temperature (Tm) plays a crucial role in GNSS PWV retrieval. In this study, a weighted average temperature model (ETm) for Europe was established and compared with existing models. The results showed that the ETm model had higher accuracy and was suitable for GNSS PWV calculation in Europe.
Article
Engineering, Electrical & Electronic
Sravan Kumar Kotha, Bhooshan Rajpathak
Summary: In this study, the accuracy of power system state estimation is addressed. A modified integer linear programming technique is proposed to achieve full observability with maximum redundancy. Additionally, a non-iterative weighted least square approach is developed to improve the accuracy of state estimation. Extensive simulations on various test systems demonstrate the effectiveness and precision of these methods.
ELECTRIC POWER SYSTEMS RESEARCH
(2022)
Article
Biochemical Research Methods
Jiajie Peng, Lu Han, Xuequn Shang
Summary: By analyzing existing cell population prediction methods, it was found that most methods require a cell-type-specific gene expression profile as input. However, in real applications, it is not always possible to find an available signature matrix. Therefore, a novel method named DCap was proposed, which predicts cell abundance using weighted non-negative least squares, and outperforms existing methods in predicting cell type abundance.
BMC BIOINFORMATICS
(2021)
Article
Mathematics
Haitham M. Yousof, S. I. Ansari, Yusra Tashkandy, Walid Emam, M. Masoom Ali, Mohamed Ibrahim, Salwa L. Alkhayyat
Summary: This study analyzes actuarial risks using heavy-tailed distributions and five key risk indicators. Four estimation methods are used to calculate these indicators, and Monte Carlo simulations are conducted to assess their performance. Real-life datasets and applications are provided to compare classical methods and showcase the importance of a proposed model evaluated via the maximum likelihood method. Actuarial risks are evaluated and analyzed using the mentioned methods and indicators based on bimodal insurance claim payments data.
Article
Mathematics, Applied
Tahani A. Abushal, Tabassum Naz Sindhu, Showkat Ahmad Lone, Marwa K. H. Hassan, Anum Shafiq
Summary: This study examines the theoretical and practical implications of the 2-component mixture of Shanker model (2-CMSM). The hazard rate function of this proposed model has rising, decreasing, and upside-down bathtub forms. Statistical characteristics of the mixed model are investigated, and appropriate approaches such as maximum likelihood, least squares, and weighted least squares are used to estimate the parameters of the mixture model.
Article
Optics
S. Sreekantha Reddy, Chandrasekhar Yammani
Summary: Accurate modeling of the Photovoltaic (PV) module is crucial for fault location in the PV array and precise MPPT algorithm design. This paper proposes a Two-Step Linear Least Square Error (LLSE) method to extract PV module parameters without the need for datasheet information or initial parameter guesses. The proposed method demonstrated low Root-Mean-Square-Error (RMSE) for various PV modules and a Real-Time Clock France solar cell.
Review
Nuclear Science & Technology
Mohammad Alrwashdeh
ANNALS OF NUCLEAR ENERGY
(2018)
Article
Chemistry, Inorganic & Nuclear
Mohammad Alrwashdeh
APPLIED RADIATION AND ISOTOPES
(2018)
Article
Nanoscience & Nanotechnology
Mohammad Alrwashdeh, Saeed A. Alameri
Article
Nuclear Science & Technology
Mohammad Alrwashdeh, Saeed A. Alameri, Ahmed K. Alkaabi
NUCLEAR SCIENCE AND ENGINEERING
(2020)
Article
Chemistry, Inorganic & Nuclear
Mohammad Alrwashdeh, Saeed Alameri
APPLIED RADIATION AND ISOTOPES
(2019)
Article
Nuclear Science & Technology
Saeed A. Alameri, Mohammad Alrwashdeh
Summary: This study focuses on the preliminary neutronic calculations for a PAHTR design with FLiBe coolant, investigating the effectiveness of IFBA coating on TRISO fuel particles, and conducting parametric studies to achieve specific cycle length and fuel burnup targets. The innovative idea of using IFBA as an additional coating layer throughout the reactor core for reactivity control mechanism is discussed. The Monte Carlo Serpent code is utilized to estimate core reactivity balance and analyze neutron spectrum, peaking factor, and multiplication factor for the 3D PAHTR reactor core at different stages of operation.
ANNALS OF NUCLEAR ENERGY
(2021)
Article
Nuclear Science & Technology
Mohammad Alrwashdeh, Saeed A. Alameri
Summary: This study compared the neutronics impact of different cladding materials on the standard APR-1400 reactor A0 fuel assembly, finding that the thermal neutron absorption cross section of different materials affects the production of actinides such as plutonium.
NUCLEAR ENGINEERING AND DESIGN
(2021)
Article
Energy & Fuels
Mohammad Alrwashdeh, Saeed A. Alameri
Summary: This study investigates the potential improvement of accident-tolerant fuels in pressurized water reactors through the enhancement of zirconium fuel-cladding systems, replacement of cladding materials, and alternative fuel forms. The neutronic behavior and properties of silicon carbide and FeCrAl cladding systems are analyzed and compared with a reference Zr fuel-cladding system. The SiC fuel-cladding system exhibits behaviors consistent with conventional Zr systems, providing better economic and safety improvements.
Article
Energy & Fuels
Mohammad Alrwashdeh, Saeed A. Alameri
Summary: This study investigates the effects of an alternative cladding material - chromium coating on reactor fuel performance, including improvements in fuel thermal conductivity.
Article
Materials Science, Multidisciplinary
Nouf T. Alhattawi, Mohammad Alrwashdeh, Saeed A. Alameri, Maitha M. Alaleeli
Summary: This study investigates the potential of using silicon carbide (SiC) and iron-chromium-aluminum (FeCrAl) cladding materials to improve the safety and efficiency of nuclear power plants, particularly in the context of accident tolerant fuel (ATF) technology concepts. The study concludes that SiC is a feasible substitute for conventional zirconium cladding by adjusting design parameters. The findings of this study have practical implications for the safety and efficiency of nuclear power plants.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Multidisciplinary Sciences
Hasan Alnuaimi, Saeed A. Alameri, Khurrum Saleem Chaudri, Mohammad Alrwashdeh
Summary: This study investigates control methods for load following operation (LFO) in APR1400 nuclear reactors. Part strength control element assemblies (PSCEAs) have been identified as a potential solution to maintain axial offset (AO) within the permitted band during LFO. A 3D model of an APR1400 reactor core was developed to simulate different power manoeuvring scenarios and establish effective reactivity control strategies. The results demonstrate that AO can be maintained within the permitted band by utilizing PSCEAs and a (1-6-1-16) or faster manoeuvring strategy was found to be more effective.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Mohammad Alrwashdeh, Saeed A. Alameri
Summary: This study conducted a neutron analysis of a soluble-free-boron APR-1400 reactor core to explore the possibility of extending the fuel life cycle from 18 to 24 months. Homogeneous and heterogeneous fuel enrichment designs were examined, while maintaining the original fuel geometries of the reactor. The results indicate that it is possible to extend the fuel cycle to up to 24 months in both the homogeneous and heterogeneous cores.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Energy & Fuels
Maithah M. Alaleeli, Saeed A. Alameri, Mohammad Alrwashdeh
Summary: This study compares the performance of potential accident-tolerant fuel (ATF) claddings composed of silicon carbide composite and conventional ZIRLO(TM) cladding in a pressurised water reactor. The simulations show that the silicon carbide composite with niobium liner exhibits superior characteristics in terms of neutron spectrum, criticality, and power distribution, performing very similarly to ZIRLO(TM) cladding.
Article
Nuclear Science & Technology
Mohammad Alrwashdeh, Wang Kan
JOURNAL OF NUCLEAR ENGINEERING AND RADIATION SCIENCE
(2016)
Proceedings Paper
Engineering, Mechanical
Mohammad Alrwashdeh, Yu Jian Kai, Aniseh Abdalla, Wang Kan
PROCEEDINGS OF THE 21ST INTERNATIONAL CONFERENCE ON NUCLEAR ENGINEERING - 2013, VOL 5
(2014)
Article
Nuclear Science & Technology
Kecheng Jiang, Jinzhao Yang, Xueli Zhao, Lei Chen, Fujun Gou, Songlin Liu
Summary: The blanket, as a key component of the fusion reactor, plays important roles in breeding tritium, shielding neutrons, and extracting thermal energy for electricity generation. Understanding the characteristics of gas-liquid two-phase flow and mass transfer is essential for optimizing the design of tritium extraction units in the blanket.
ANNALS OF NUCLEAR ENERGY
(2024)
Article
Nuclear Science & Technology
Anna-Elina Pasi, Teemu Karkela, Fredrik Borjesson Sanden, Unto Tapper, Tuula Kajolinna, Christian Ekberg
Summary: This study investigates the gas-phase interactions between tellurium and organic material under severe nuclear accident conditions. The results show that there is interaction between tellurium aerosols and organic material, leading to an increase in the gaseous fraction and changes in XPS spectra. Although the exact species are not identified, these findings raise questions about the behavior of tellurium and its reactions with organic material in severe accident conditions.
ANNALS OF NUCLEAR ENERGY
(2024)
Article
Nuclear Science & Technology
Ao Zhang, Qingye Li, Chaoyong Zong, Fuwen Liu, Tianhang Xue, Jian Xiao, Xueguan Song
Summary: In this study, a high-fidelity computational fluid dynamics model was established to investigate the flow characteristics of a novel balanced globe valve. The study found that the size of the throttle orifice and valve disc displacement have a significant impact on fluid force. The findings provide a basis for the design and dynamic control of globe valves, and also have potential value for energy utilization.
ANNALS OF NUCLEAR ENERGY
(2024)
Article
Nuclear Science & Technology
Wenbo Li, Yunqing Bai, Shuai Zhang, Yang Li, Ming Jin, Chunjing Li
Summary: In this study, a 3D-CFD model based on the SUPERCAVNA facility was established to analyze thermal stratification in liquid-metal-cooled nuclear reactors. The results show that the SKE model is the most accurate in predicting temperature distribution, and further parametric studies were conducted.
ANNALS OF NUCLEAR ENERGY
(2024)
Article
Nuclear Science & Technology
Song Jin, Di Jiang, Dongmei Wang, Shaojie Wang, Zhen Wang
Summary: This study presents the fragility evaluation of a nuclear containment structure subjected to earthquake and subsequent internal pressure sequence. Nonlinear finite element model and ground motion records are used to analyze the nonlinear response and fragility of the structure. Results show that the distribution of maximum strain and displacement of the structure under earthquake and subsequent pressure are significantly different, with displacement distribution related to ground motion intensity levels.
ANNALS OF NUCLEAR ENERGY
(2024)
Article
Nuclear Science & Technology
Kazumasa Shimada, Tatsuya Sakurahara, Pegah Farshadmanesh, Seyed Reihani, Zahra Mohaghegh
Summary: This research improves the realism of Level 3 probabilistic risk assessment for nuclear power plants by modeling the evacuation behavior of residents and incorporating two advancements. The first advancement uses evacuation speed from a transportation simulation code as input to the Level 3 PRA code, enabling explicit incorporation of spatiotemporal evacuation processes. The second advancement incorporates the probability of seismic damage to roadway bridges into Level 3 PRA and calculates evacuation routes and speeds considering the impact of seismic damage.
ANNALS OF NUCLEAR ENERGY
(2024)
Article
Nuclear Science & Technology
F. Mascari, A. Bersano, M. Massone, G. Agnello, O. Coindreau, S. Beck, L. Tiborcz, S. Paci, M. Angelucci, L. E. Herranz, R. Bocanegra, Y. Pontillon, M. Berdai, O. Cherednichenko, A. Iskra, M. Nudi, P. Groudev, P. Petrova, F. Kretzschmar, F. Gabrielli, Z. Kanglong, V. Vileiniskis, T. Kaliatka, J. Kalilainen, M. Malicki, D. Gumenyuk, Y. Vorobyov, O. Kotsuba, P. Dejardin, M. Di Giuli, R. Thomas, I. V. Ivanov, F. Giannetti, M. D'Onorio, G. Caruso, M. Salay, T. Sevon
Summary: The MUSA project aims to analyze uncertainties and sensitivities associated with severe accidents using a harmonized approach, particularly focusing on source term figures of merit. The project applied and tested uncertainty quantification methodologies using the PHEBUS FPT1 test. The study found that scripting for coupling SA codes and uncertainty tools can increase flexibility, and careful consideration should be given to selecting the input uncertain parameters.
ANNALS OF NUCLEAR ENERGY
(2024)
Article
Nuclear Science & Technology
Ian Greenquist, Nathan Capps
Summary: The US nuclear energy industry is investigating strategies to increase reactor operating cycle to 24 months. Multiphysics simulations tools and methodologies are being developed to predict the effects of this change during transient events such as loss-of-coolant accidents (LOCAs).
ANNALS OF NUCLEAR ENERGY
(2024)
Article
Nuclear Science & Technology
Guangchun Zhang, Hu Zhang
Summary: In this study, a neutron transport code called TARS is introduced, which is based on the discrete-ordinates discontinuous finite element method. TARS provides accurate and efficient solutions to the neutron transport equation, addressing existing challenges in the field. The evaluation results demonstrate that TARS generates highly accurate solutions and achieves high parallel computation efficiency.
ANNALS OF NUCLEAR ENERGY
(2024)
Article
Nuclear Science & Technology
J. R. Daniels, M. M. R. Williams, M. D. Eaton
Summary: This paper presents the development and verification of a collision probability (CP) code for neutron transport in slabs and cylinders. The CP code is particularly useful for modelling layered systems of aqueous and organic plutonium nitrate. The code provides a computationally inexpensive alternative to higher fidelity codes like MCNP. It is effective for slab geometries with at least 0.7 g cm-2 plutonium, but its approximation for heterogeneous cylinders can lead to overestimation of neutron leakage. Increasing the cylinder radius to 40.0 cm improves the accuracy for systems with at least 2.75 kg plutonium. However, the code's accuracy decreases when modelling cylindrical geometries with dished ends and low plutonium content.
ANNALS OF NUCLEAR ENERGY
(2024)
Article
Nuclear Science & Technology
Alexander A. Ryzhkov, Georgy V. Tikhomirov, Mikhail Yu. Ternovykh
Summary: This paper analyzes the impact of nuclear data uncertainties on the safety of advanced reactors, with a specific focus on angular distribution uncertainties. Through sensitivity and uncertainty analysis, key parameters for MOX3600 are identified, and a comparison of different libraries' uncertainties on the eigenvalue is performed.
ANNALS OF NUCLEAR ENERGY
(2024)
Article
Nuclear Science & Technology
Y. Fontenla, A. Vidal-Ferrandiz, A. Carreno, D. Ginestar, G. Verdu
Summary: FEMFFUSION is an open source code that solves the multigroup neutron transport equation using the diffusion and the SPN approximations. It uses the finite element method to handle various geometries and problem dimensions, and has been verified against the C5G7 benchmark.
ANNALS OF NUCLEAR ENERGY
(2024)
Article
Nuclear Science & Technology
J. Tyler Gates, Pavel V. Tsvetkov
Summary: The Optical Fiber Based Gamma Thermometer utilizes optical fiber as a distributed temperature sensor to measure the temperature of a thermal mass undergoing gamma heating and calculate the gamma flux data. This technology shows promise in determining the local power density within a nuclear reactor core and provides an unparalleled level of precision in reactor power measurement.
ANNALS OF NUCLEAR ENERGY
(2024)
Article
Nuclear Science & Technology
A. de Lara, A. Schubert, E. Shwageraus, P. Van Uffelen
Summary: This study presents a new methodology to derive the radial form factor in the TRANSURANUS burnup model using simulations. The proposed methodology can be applied to different types of reactors, including LWRs and HWRs, and is suitable for advanced technology fuels.
ANNALS OF NUCLEAR ENERGY
(2024)
Article
Nuclear Science & Technology
A. Bousbia Salah, M. Di Giuli, P. Foucaud, R. Iglesias, A. Malkhasyan, M. Salmaoui, L. E. Herranz
Summary: In the framework of the R2CA project, the application of advanced codes for evaluating radiological release under design basis accidents was considered. The study focused on a specific scenario and assessed the results obtained by different organizations using different computational tools and approaches. The outcomes highlighted modeling differences and challenges in carrying out such analysis.
ANNALS OF NUCLEAR ENERGY
(2024)
