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2024 International Conference on Optoelectronic Information and Functional Materials, OIFM 2024

作者： zhang, Tingyi Li, Shaowu Chen, Jinbiao Liu, xuwen Guo, Weihao College of Intelligent Systems Science and Engineering Hubei Minzu University Enshi445000 China

ISBN: (纸本)9781510680517

Photovoltaic power prediction is crucial for maintaining the safe, stable operation, and economic benefits of the power grid. However, the long short-term memory (LSTM) neural network faces limitations in parameter selection, affecting its effectiveness in photovoltaic power prediction. Additionally, photovoltaic power data exhibits volatility and non-stationarity, leading to inaccurate predictions. To address these issues, this paper proposes a coupled model named VMD-SSA-LSTM, which combines variational mode decomposition (VMD), sparrow search algorithm (SSA), and LSTM. The model initially employs VMD to decompose photovoltaic power data, reducing the impact of volatility and non-stationarity on prediction results. Subsequently, SSA is used to optimize LSTM parameters. Finally, the predicted values from each sequence are summed to obtain the photovoltaic power prediction. Simulation experiments demonstrate the model's high adaptability in short-term photovoltaic power prediction. Compared to the LSTM model, the VMD-SSA-LSTM model exhibits superior performance in prediction accuracy, stability, and robustness. Therefore, this model provides an effective solution to enhance the accuracy of photovoltaic power prediction, contributing to the safety, stability, and economic efficiency of power grid operation. © 2024 SPIE.

关键词： Variational mode decomposition

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Photovoltaic MPPT control based on IJAYA algorithm

Photovoltaic MPPT control based on IJAYA algorithm

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2024 International Conference on Optoelectronic Information and Functional Materials, OIFM 2024

作者： Guo, Weihao Li, Shaowu zhang, Tingyi Chen, Jinbiao Liu, xuwen College Of Intelligent Systems Science and Engineering Hubei Minzu University Hubei Enshi445000 China

ISBN: (纸本)9781510680517

This paper introduces an MPPT control methodology utilizing the IJAVA algorithm. This approach merges the traditional JAVA algorithm with a Levy flight strategy, enabling the algorithm to evade local optima and conduct a comprehensive global search for the optimal solution., so that the algorithm can ensure the convergence speed and give attention to the convergence accuracy, further accelerate the tracking speed by optimizing the initialization position of the population, and reduce the voltage and power oscillation in the tracking process by adding out-of-bounds processing mechanism. Based on the modeling and simulation outcomes, the MPPT control utilizing the IJAVA algorithm demonstrates the capability to effectively and precisely trace the optimum power point in the presence of partial shading, as evidenced by the results. © 2024 SPIE.

关键词： Solar energy

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IGA-BiLSTM: An Improved Method for Network Security Situation Awareness 4

IGA-BiLSTM: An Improved Method for Network Security Situatio...

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4th International Conference on Electronic Communication and Artificial Intelligence, ICECAI 2023

作者： Hong, Chongwei Qin, Yong Qin, xuwen zhang, Dongcheng Dongguan University of Technology School of Computer Science and Technology Dongguan China Dongguan University of Technology School of Cyberspace Security Dongguan China Grade 2 Shenzhen College of International Education Dongguan China Dongguan University of Technology Zhixing College of Dgut Dongguan China

ISBN: (纸本)9798350314496

This paper presents an improved prediction model based on LSTM to solve traditional network security situation perception and prediction problems. Due to the significant advantages of BiLSTM in processing network data with time series characteristics and often related content, this paper will design a prediction model based on the Bi-LTM model. As a neural network model, the setting of LSTM's superparameters is always a difficult point. On the basis of BiLSTM, this paper improves the original algorithm by using the immune genetic algorithm IGA, which enables the new algorithm to select better parameters and process random data on the basis of processing time series data. In this article, we analyze the UNSW-NB15 intrusion detection dataset, which will be used to train and test our model. Compared with the original LSTM algorithm and Bi LSTM algorithm, the prediction accuracy of the final model is improved. In the binary classification problem, the prediction accuracy has been improved by 1%-2%. In the multi classification problem, the prediction accuracy has improved by up to 3%, while F1 Measure has also improved by 2%. In the recognition of different types of anomalies, the F1-Measure of the IGA-LSTM model also has an improvement of 1%-2%. Finally, for situation prediction, the IGA-LSTM model's situation curve is closer to the actual situation curve. © 2023 IEEE.

关键词： Neural network models

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Finite element analysis of corn kernel damage: a viscoelastic model approach for impact-induced damage prediction

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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2025年第7期105卷 3993-4004页

作者： Zhao, Xuelin zhang, Qiang Fang, xuwen zhang, Jinsong Feng, Weijing zhang, Li Zhou, Deyi Yu, Chunsheng Wang, Hao Gao, Xiaodi Zhou, Haigen Wu, Xinling Jilin Univ Coll Biol & Agr Engn Changchun 130022 Peoples R China

BACKGROUNDIn the present study, we address the quality degradation of corn during post-harvest processing by developing a viscoelastic composite model to predict kernel damage during post-harvest processing. The model, based on high-resolution scanning and inverse modeling techniques, provides an accurate representation of the complex internal components of corn kernels, which allows for the analysis of their stress response and damage susceptibility trends under different impact *** results show that the viscoelastic model has a relative error of 2.4% compared to the drop test data, thus demonstrating that the viscoelastic model has a very high accuracy in predicting impact damage and is able to accurately localize the flour-like endosperm as the main region of impact damage. The model showed a high correlation (0.99) between predicted and experimental damage rates by response surface *** damage during processing is reduced by reducing the proportion of flour-like endosperm in maize kernels. A new method for reducing damage during food handling and processing operations is proposed, providing an important reference for improving kernel durability and contributing to the development of gentler processing techniques to improve the quality of maize products. (c) 2025 Society of Chemical Industry.

关键词： viscoelastic composite model collision damage finite element method burgers model high moisture corn kernel

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Model-based clustering of time-dependent categorical sequences with application to the analysis of major life event patterns

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STATISTICAL ANALYSIS AND DATA MINING 2021年第3期14卷 230-240页

作者： zhang, Yingying Melnykov, Volodymyr Zhu, xuwen Univ S Alabama Mobile AL USA Univ Alabama 346 Alston Hall Tuscaloosa AL 35487 USA

Clustering categorical sequences is a problem that arises in many fields. There is a few techniques available in this framework but none of them take into account the possible temporal character of transitions from one state to another. A mixture of Markov models is proposed, where transition probabilities are represented as functions of time. The corresponding expectation-maximization algorithm is discussed along with related computational challenges. The effectiveness of the proposed procedure is illustrated on the set of simulation studies, in which it outperforms four alternative approaches. The method is applied to major life event sequences from the British Household Panel Survey. As reflected by Bayesian Information Criterion, the proposed model demonstrates substantially better performance than its competitors. The analysis of obtained results and related transition probability plots reveals two groups of individuals: people with a conventional development of life course and those encountering some challenges.

关键词： categorical sequences cluster analysis finite mixture model Markov model time-dependent data

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Extracellular Vesicles Separation and Biomedical Application Based on Affinity Recognition and Antifouling Coating Bifunctional Microsphere

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ANALYTICAL CHEMISTRY 2025年第8期97卷 4542-4548页

作者： He, Yuxing Kang, Jia Yang, xuwen Deng, Nan Hui, Lingyun Yu, Yunxuan Bian, Yangyang Tao, Fufang Duan, Xinrui zhang, Jing Shaanxi Normal Univ Sch Chem & Chem Engn Key Lab Analyt Chem Life Sci Shaanxi Prov Xian 710119 Shaanxi Peoples R China Xi An Jiao Tong Univ Instrumental Anal Ctr Xian 710049 Shaanxi Peoples R China Xi An Jiao Tong Univ Affiliated Hosp 1 Xian 710061 Shaanxi Peoples R China Northwest Univ Coll Life Sci Key Lab Resource Biol & Modern Biotechnol Western Xian 710069 Shaanxi Peoples R China Shaanxi Prov Drug Tech Evaluat Ctr Xian 710065 Shaanxi Peoples R China

Extracellular vesicles (EVs) are crucial mediators in various physiological and pathological processes, facilitating intercellular communication and offering potential as diagnostic disease markers. However, existing EVs separation methods have limitations that hinder their clinical application. In this study, we present a novel approach using bifunctional silica microspheres (SiO2-PTB-PS) for the specific, nondestructive isolation of EVs from complex biological media. The isolated EVs were subsequently used for direct cancer detection in clinical samples. The SiO2-PTB-PS microspheres, functionalized with a phosphatidylserine (PS) recognition peptide (PSpep), specifically bound to PS on the EVs surface. Additionally, an anti-adhesion coating on the silica microspheres minimized protein contamination, enhancing purity. This affinity-based recognition and antifouling strategy ensured high-purity EVs separation. Furthermore, we developed a detection system combining SiO2-PTB-PS microspheres with surface-enhanced Raman scattering (SERS) nanoprobes to identify protein tyrosine kinase 7 (PTK7) and epithelial cell adhesion (EpCAM) on the EVs membrane, achieving 80% precision in distinguishing cancer patients from healthy donors. The SiO2-PTB-PS microsphere system shows significant promise as a biotechnology tool, advancing the clinical application of EVs-based diagnostics.

关键词： Microspheres

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Enhancing CO2 hydrate sequestration through underlying methane hydrate production: A novel strategy for carbon storage

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ENERGY 2025年 326卷

作者： Li, Yuxuan zhang, Zhaobin zhang, Bo Chalaturnyk, Rick Li, Shouding He, Jianming Xie, Zhuoran Bian, Hang Li, Xiao Lu, Cheng Qin, xuwen Chinese Acad Sci Inst Geol & Geophys Key Lab Deep Petr Intelligent Explorat & Dev Beijing 100029 Peoples R China Univ Chinese Acad Sci Coll Earth & Planetary Sci Beijing 100049 Peoples R China Univ Alberta Donadeo Innovat Ctr Engn Dept Civil & Environm Engn Edmonton AB T6G 1H9 Canada China Geol Survey Minist Nat Resources Beijing 100037 Peoples R China

Seafloor CO2 sequestration in the form of gas hydrates offers expansive geological opportunities for carbon neutrality strategies. Guided by phase equilibrium conditions, this study employs a self-developed multi-physical simulator to investigate how methane hydrate production beneath a CO2 sequestration zone can facilitate carbon storage. A dual-horizontal-well model is constructed and validated based on field measurements. Through numerical simulations, the effects of methane hydrate production timing, CO2 injection rate, and injection depth on carbon sequestration over a 100,000-year timescale are examined. Two novel metrics-sequestration efficiency and safe distance-are introduced. Results indicate that extracting methane hydrates in the later stages of CO2 injection is optimal. Furthermore, an efficient sequestration window exists for both injection rate and depth. By exploring the relationship between sequestration efficiency and storage safety, this study provides a new perspective for implementing CO2 sequestration pathways.

关键词： CO 2 sequestration Methane hydrate production Multi-physical Sequestration efficiency Storage safety

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Influence of ballasted material properties in enhancing the separation of high concentration suspended solids in coal mining water

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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION 2022年第0期157卷 458-465页

作者： zhang, Xiaohang Liu, Yanping Wei, Ming Tan, Jinlong Yang, Tingchao He, xuwen China Univ Min & Technol Beijing Sch Chem & Environm Engn Beijing 100083 Peoples R China Handan Municipal Publ Util Investment Grp Co Ltd Dept Engn & Technol Handan 056000 Hebei Peoples R China Hebei Vocat Coll Polit & Law Party Comm Shijiazhuang 050061 Hebei Peoples R China Hebei Univ Engn Sch Min & Geomat Engn Handan 056038 Hebei Peoples R China Hebei Prov Coal Geol Bureanu Business Dev Sect Hydrol Geol Team Handan 056001 Hebei Peoples R China

With the continuous improvement and economic development of China's coal mining industry, research on the characteristics of wastewater discharge has gained attraction in recent years. Ballasted flocculation technology, has been widely used in recent years. However, its effect on the settling velocity of the flocs in wastewater has not been quantified. This study aimed to screen optimal reaction condition for ballasted flocculation and to derive the settling velocity of the ballasted flocs under these conditions. The results showed that, the size of the ballasted material had no significant effect on the turbidity and suspended solids removal rate;however, the settling time was effectively shortened, and the turbidity removal rate could reach more than 95% within 15 s. Owing to the optimization of the reaction conditions, 90% of the flocs sizes were distributed in the 80-200 mu m range. Moreover, the difference between the theoretical and the measured value of the ballasted flocculation was small, indicating that the derived formula could effectively quantify the settling velocity of the ballasted flocs under optimal conditions. These findings may serve as a critical reference for the treatment of high-suspended solids in coal mining water and have significant potential for engineering application. (c) 2021 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

关键词： Ballasted flocculation Fractal dimension Settlement velocity Stress analysis Coal mining water

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Prediction of Subsequent Vertebral Fracture After Acute Osteoporotic Fractures from Clinical and Paraspinal Muscle Features

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CALCIFIED TISSUE INTERNATIONAL 2024年第6期114卷 614-624页

作者： Xiong, Yuchao zhang, Cici Chen, Xiaopei Wu, Li Liang, Shaohua zhang, Ye Huang, Junbing Guo, Wei Zeng, xuwen Xu, Fan Jinan Univ Guangzhou Red Cross Hosp Dept Radiol Guangzhou Peoples R China

To construct a nomogram based on clinical factors and paraspinal muscle features to predict vertebral fractures occurring after acute osteoporotic vertebral compression fracture (OVCF). We retrospectively enrolled 307 patients with acute OVCF between January 2013 and August 2022, and performed magnetic resonance imaging of the L3/4 and L4/5 intervertebral discs (IVDs) to estimate the cross-sectional area (CSA) and degree of fatty infiltration (FI) of the paraspinal muscles. We also collected clinical and radiographic data. We used univariable and multivariable Cox proportional hazards models to identify factors that should be included in the predictive nomogram. Post-OVCF vertebral fracture occurred within 3, 12, and 24 months in 33, 69, and 98 out of the 307 patients (10.8%, 22.5%, and 31.9%, respectively). Multivariate analysis revealed that this event was associated with percutaneous vertebroplasty treatment, higher FI at the L3/4 IVD levels of the psoas muscle, and lower relative CSA of functional muscle at the L4/5 IVD levels of the multifidus muscle. Area under the curve values for subsequent vertebral fracture at 3, 12, and 24 months were 0.711, 0.724, and 0.737, respectively, indicating remarkable accuracy of the nomogram. We developed a model for predicting post-OVCF vertebral fracture from diagnostic information about prescribed treatment, FI at the L3/4 IVD levels of the psoas muscle, and relative CSA of functional muscle at the L4/5 IVD levels of the multifidus muscle. This model could facilitate personalized predictions and preventive strategies.

关键词： Osteoporosis Compression fracture Paraspinal muscles Fat infiltration Nomograms

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Occurrence, transfer rule, and dietary risk assessment of aflatoxins in medicinal and edible seeds

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FOOD BIOSCIENCE 2025年 63卷

作者： Lv, Jianxin zhang, Huiru Wang, xuwen Luo, Jiaoyang Wang, Yudan Kong, Dandan Wang, Chuang Guo, Mengyue Yang, Meihua Chinese Acad Med Sci Inst Med Plant Dev Key Lab Bioact Subst & Resources Utilizat Chinese Minist Educ Beijing 100193 Peoples R China Peking Union Med Coll Beijing 100193 Peoples R China Chinese Acad Med Sci Hainan Branch Inst Med Plant Dev Haikou 570311 Peoples R China

The last three decades have seen a rise in the use of herbal remedies and supplements, with more than 80% of the world's population relying on them for primary care. However, aflatoxin contamination in herbal remedies may constitute a risk to human health. In this study, a simple and robust method for the simultaneous detection of aflatoxins in four types of medicinal and edible seeds was developed by using UFLC-MS/MS combined with QuECHERS pretreatment. Meanwhile, the transfer rule of the aflatoxins in medicinal and edible seeds during the decoction process was explored, followed by dietary risk assessment based on Monte Carlo simulation. Results showed that aflatoxin contamination was found in 80.6% of the samples (62/77), with the contamination levels of 0.04-258.72 mu g/kg. Notably, high levels of aflatoxins were found in Ziziphi Spinosae Semen and Platycladi Semen, while low aflatoxin transfer rates (1.13%-11.86%) were observed during the decoction process. The estimated daily intake (EDI) of AFB1 could reach 15.314 and 0.333 ng/kg bw/day by ingesting aflatoxinsusceptible Ziziphi Spinosae Semen and Platycladi Semen, respectively. The population cancer risks ranged from 3.34 x 10- 8 to 2.86 x 10-4 hepatocellular carcinoma cases per 105 persons per year. The probabilistic risk assessment indicated a short-term and long-term health concern of intaking these two medicinal and edible seeds contaminated by aflatoxins. This study revealed the occurrence and transfer pattern of aflatoxins in the medicinal and edible seeds and evaluated the risks of their dietary exposure, providing a basis for their safe use.

关键词： Medicine food homology Aflatoxin Detection Transfer rule Risk assessment

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