Wuhan University Journal of Natural Sciences最新文献_第3页

Pre-Earthquake Ionospheric Anomalies of the Wenchuan Earthquake Studied with DEMETER Satellite 用DEMETER卫星研究汶川地震震前电离层异常

Wuhan University Journal of Natural Sciences Pub Date : 2023-10-01 DOI: 10.1051/wujns/2023285441

Jingming LU, Yaogai HU, Chunhua JIANG, Zhengyu ZHAO, Yuannong ZHANG

{"title":"Pre-Earthquake Ionospheric Anomalies of the Wenchuan Earthquake Studied with DEMETER Satellite","authors":"Jingming LU, Yaogai HU, Chunhua JIANG, Zhengyu ZHAO, Yuannong ZHANG","doi":"10.1051/wujns/2023285441","DOIUrl":"https://doi.org/10.1051/wujns/2023285441","url":null,"abstract":"The pre-earthquake ionospheric anomalies in Wenchuan, China (21°-41°N, 93°-113°E) are studied and analyzed using the summer nighttime data from 2005 to 2008 measured by DEMETER (Detection of Electro-Magnetic Emission Transmitted from Earthquake Regions) satellite detectors ICE (Internet Communications Engine), IAP (In Application Programming), and ISL (Interior Switching Link). In this paper, we take the 12 May 2008 Wenchuan earthquake as an example, use the spatial gridding method to construct the background field over the epicenter, analyze the background characteristics of very low frequency (VLF) electric field components, low-energy particle parameters, and plasma parameters, and define the perturbation intensity index of each parameter before the earthquake to extract each parameter anomaly in both space and time dimensions. The results show that the background values of some ionospheric parameters in the Wenchuan area are related to spatial distribution. Moreover, anomalous enhancement of low-frequency electric field power spectral density, H + concentration, He + concentration and ion concentration with different intensities and anomalous weakening of ion temperature were extracted in the fifteen days before the Wenchuan earthquake. After filtering the data to exclude external interference, such as solar activity, this paper concludes that there is some connection between these anomalies and the Wenchuan earthquake.","PeriodicalId":23976,"journal":{"name":"Wuhan University Journal of Natural Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136204163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improved Hybrid Collaborative Fitering Algorithm Based on Spark Platform 基于Spark平台的改进混合协同滤波算法

Wuhan University Journal of Natural Sciences Pub Date : 2023-10-01 DOI: 10.1051/wujns/2023285451

Zhen YOU, Hongwen HU, Yutao WANG, Jinyun XUE, Xinwu YI

{"title":"Improved Hybrid Collaborative Fitering Algorithm Based on Spark Platform","authors":"Zhen YOU, Hongwen HU, Yutao WANG, Jinyun XUE, Xinwu YI","doi":"10.1051/wujns/2023285451","DOIUrl":"https://doi.org/10.1051/wujns/2023285451","url":null,"abstract":"An improved Hybrid Collaborative Filtering algorithm (H-CF) is proposed, addressing the issues of data sparsity, low recommendation accuracy, and poor scalability present in traditional collaborative filtering algorithms. The core of H-CF is a linear weighted hybrid algorithm based on the Latent Factor Model (LFM) and the Improved Item Clustering and Similarity Calculation Collaborative Filtering Algorithm (ITCSCF). To begin with, the items are clustered based on their attribute dimension, which accelerates the computation of the nearest neighbor set. Subsequently, H-CF enhances the formula for scoring similarity by penalizing popular items and optimizing unpopular items. This improvement enhances the rationality of scoring similarity and reduces the impact of data sparseness. Furthermore, a weighting function is employed to combine the various improved algorithms. The balance factor of the weighting function is dynamically adjusted to attain the optimal recommendation list. To address the real-time and scalability concerns, the algorithm leverages the Spark big data distributed cluster computing framework. Experiments were conducted using the public dataset MovieLens, where the improved algorithm's performance was compared against the algorithm before enhancement and the algorithm running on a single machine. The experimental results demonstrate that the improved algorithm outperforms in terms of data sparsity, recommendation personalization, accuracy, recall, and efficiency.","PeriodicalId":23976,"journal":{"name":"Wuhan University Journal of Natural Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136206436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Generators and Relations for Little q-Schur Algebra u_k(3,5) 小q-Schur代数uk(3,5)的生成和关系

Wuhan University Journal of Natural Sciences Pub Date : 2023-10-01 DOI: 10.1051/wujns/2023285385

Mingqiang LIU, Qian YANG

引用次数: 0

An Anonymous Authentication Scheme with Selective Linkability and Threshold Traceability 具有可选链接性和阈值可追溯性的匿名认证方案

Wuhan University Journal of Natural Sciences Pub Date : 2023-08-01 DOI: 10.1051/wujns/2023284317

Guangning Pu, Fengmei Yin

{"title":"An Anonymous Authentication Scheme with Selective Linkability and Threshold Traceability","authors":"Guangning Pu, Fengmei Yin","doi":"10.1051/wujns/2023284317","DOIUrl":"https://doi.org/10.1051/wujns/2023284317","url":null,"abstract":"In order to protect the user's privacy identity, authentication requires anonymous authentication. Anonymous authentication is divided into unconditional anonymous authentication and traceable anonymous authentication. Unconditional anonymous authentication can verify that the user belongs to an anonymous set, but the user's true identity cannot be obtained. However, in some applications, it is necessary to trace the true identity of the user. Therefore, a traceable anonymous authentication scheme is proposed. In order to prevent random tracing, the proposed scheme uses threshold joint tracing. When the identity of the authenticator needs to be traced, the threshold number of members can jointly trace the identity of the authenticator. In some special network applications such as anonymous electronic voting, in order to prevent repeated authentications and repeated elections, it is necessary to verify whether the two authentication signatures are signed by the same user without revealing the true identity of the user. Therefore, the proposed anonymous authentication scheme should have selective linkability. In order to achieve linkable authentication, the linkable tag is embedded by linkable ring signature. Compared with similar schemes through the simulation experiments, the implementation time of the proposed scheme is slightly better than other schemes.","PeriodicalId":23976,"journal":{"name":"Wuhan University Journal of Natural Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43241448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Deformation Damage and Energy Evolution of Basalt Fiber Reinforced Concrete under the Triaxial Compression 玄武岩纤维混凝土三轴压缩变形损伤及能量演化

Wuhan University Journal of Natural Sciences Pub Date : 2023-08-01 DOI: 10.1051/wujns/2023284359

Yufen Lu, Congyan Fang, Jiajian Lin, Huaxia Zhuang

{"title":"Deformation Damage and Energy Evolution of Basalt Fiber Reinforced Concrete under the Triaxial Compression","authors":"Yufen Lu, Congyan Fang, Jiajian Lin, Huaxia Zhuang","doi":"10.1051/wujns/2023284359","DOIUrl":"https://doi.org/10.1051/wujns/2023284359","url":null,"abstract":"To explore the law of energy evolution and the change of damage before and after specimen failure, the conventional triaxial compression tests (5, 10, 15, 20, and 30 MPa) of basalt fiber reinforced concrete (BFRC) with different fiber volume fractions (0, 0.2% and 0.4%) were carried out by MTS816 rock testing system, and the cyclic loading and unloading tests of BFRC with a fiber content of 0.2% were carried out. The experimental results show that the peak strength and strain of BFRC increase with the increase of confining pressure. Tensile failure occurs under low confining pressure, and shear failure occurs under high confining pressure. The best volume fraction of fiber is 0.2%. Under different confining pressures, the input energy, elastic energy, plastic properties, and dissipated energy of the samples first increase and then decrease to a stable level. The elastic energy and dissipated energy reach the maximum near the peak stress, while the input energy and plastic properties reach the maximum at the peak. At the same time, the damage increases continuously with the input of load under different confining pressures, indicating that the failure of the specimen is a process of energy accumulation.","PeriodicalId":23976,"journal":{"name":"Wuhan University Journal of Natural Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46312982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Controllable Synthesis of Carboxymethyl Cellulose and Its Application in Tobacco Sheets 羧甲基纤维素的可控合成及其在烟草片上的应用

Wuhan University Journal of Natural Sciences Pub Date : 2023-08-01 DOI: 10.1051/wujns/2023284341

Qunshan Yan, Pei Wei, Rui Peng, Shilin Tian, Dan Li, Yuxing Tong, Jiazhi Ni, Liangcai Liu, Bin Xiong

引用次数: 0

Simultaneous Analysis of Indapamide and Related Impurities in Sustained-Release Tablets by a Single-Run HPLC-PDA Method HPLC-PDA法同时测定吲达帕胺缓释片中杂质

Wuhan University Journal of Natural Sciences Pub Date : 2023-08-01 DOI: 10.1051/wujns/2023284333

Wu Yao, Shiwen Zhou, Qiongru Cheng

{"title":"Simultaneous Analysis of Indapamide and Related Impurities in Sustained-Release Tablets by a Single-Run HPLC-PDA Method","authors":"Wu Yao, Shiwen Zhou, Qiongru Cheng","doi":"10.1051/wujns/2023284333","DOIUrl":"https://doi.org/10.1051/wujns/2023284333","url":null,"abstract":"The contents of indapamide and related impurities in generic indapamide sustained-release tablets were simultaneously detected by a single-run high performance liquid chromatography equipped with photodiode array detector (HPLC-PDA) method for the quality control in this paper. The results showed the method had a good selectivity and was validated through linearity, limits of detection and quantification, recovery, and precision. The linear ranges of indapamide, 2-methyl-1-nitroso-2,3-dihydro-1H-indole (impurity A, ImA), 4-chloro-N-(2-methyl-1H-indol-1-yl)-3-sulphamoyl-benzamide (impurity B, ImB) and 4-chloro-3-sulfamoylbenzoic acid (impurity 1, Im1) were 0.028-1.80 μg/mL (R=0.999 95), 0.060-1.20 μg/mL (R=0.999 6), 0.032 4-1.20 μg/mL (R=0.999 85) and 0.060-1.20 μg/mL (R=0.999 7) with detection limits of 0.009 3, 0.012, 0.012 and 0.006 μg/mL, respectively. ImA and Im1 were not detectable in the generic drug. The content of indapamide was 96.7% of the labeled amount with a relative standard deviation (RSD) of 1.30%, and the percentage of ImB relative to the labeled amounts of indapamide was 0.106% with an RSD of 1.82%. The content of other unspecified impurities all met the reference quality standards. The results provided references for the quality control and the quality standard study of generic indapamide sustained-release tablets.","PeriodicalId":23976,"journal":{"name":"Wuhan University Journal of Natural Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48524159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sign Patterns of Orders up to 4 that Allow Diagonalizability 允许对角化的4阶符号模式

Wuhan University Journal of Natural Sciences Pub Date : 2023-08-01 DOI: 10.1051/wujns/2023284277

Xinlei Feng

引用次数: 0

Multi-Parameter and Multi-Objective Optimization of Occupant Restraint System in Frontal Collision 正面碰撞乘员约束系统的多参数多目标优化

Wuhan University Journal of Natural Sciences Pub Date : 2023-08-01 DOI: 10.1051/wujns/2023284324

Zhongke Xiang, F. Xiang

{"title":"Multi-Parameter and Multi-Objective Optimization of Occupant Restraint System in Frontal Collision","authors":"Zhongke Xiang, F. Xiang","doi":"10.1051/wujns/2023284324","DOIUrl":"https://doi.org/10.1051/wujns/2023284324","url":null,"abstract":"To solve the constraints of multi-objective optimization of the driver system and high nonlinear problems, according to the relevant dimensions of a car, we build a simulation model with Hybrid III 50th dummy driver constraint system. The comparison of the driver mechanics index of the experimental data with the simulation data in the frontal crash shows that the accuracy of simulation model meets the requirements. The optimal Latin test design is adopted, and the global sensitivity analysis of the design parameters is carried out based on the Kriging model. The four most sensitive parameters are selected, and the parameters are solved by a multi-island genetic algorithm. And then the nonlinear programming quadratic line (NLPQL) algorithm is used to search for accurate optimization. The optimal parameters of the occupant restraint system are determined: the limiting force value of force limiter 2 985.603 N, belt extension 12.684%, airbag point explosion time 27.585 ms, and airbag vent diameter 27.338 mm, with the weighted injury criterion (WIC) decreased by 12.97%, the head injury decreased by 22.60%, and the chest compression decreased by 7.29%. The results show that the system integration of passive safety devices such as seat belts and airbags can effectively protect the driver.","PeriodicalId":23976,"journal":{"name":"Wuhan University Journal of Natural Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49489535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis and Raman Performance Enhancement of Multilayer AuAg Heterostructures with Magnetic Resonance 多层AuAg异质结构的合成及其拉曼性能的磁共振增强

Wuhan University Journal of Natural Sciences Pub Date : 2023-08-01 DOI: 10.1051/wujns/2023284351

Fan Huang, Zhirui Zhao, Jingru Feng, Liang Ma, Sijing Ding

引用次数: 0