Search

Copyright of Journal of Zhengzhou University: Engineering Science is the property of Editorial Office of Journal of Zhengzhou University: Engineering Science and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

With the development of intelligent robot navigation technology, much more attention has been paid on the research of path planning. An improved gray wolf optimization (GWO) algorithm was proposed for local optimum and slow convergence seed in robot path planning. Firstly, a two-dimensional spatial model was used to imitate the path planning process of robots. In the global search process, a dynamic perturbation coefficient and nonlinear decreasing control parameters(which are improved from linear decreasing) were proposed in the formula of position updating for the aim of enhancing global search performance. Then, considering the diversity of gray wolf population and local mining ability of the algorithm, a reverse learning selection strategy was introduced, which led to the improvement of convergence accuracy of the algorithm. The testing data from eight common functions has shown the effectiveness of the improved algorithm. Finally, a comparative experiment has been made among the improved gray wolf optimization algorithm, the original gray wolf optimization algorithm and particle swarm optimization algorithm, and the data has shown that the average path distance is shortened by 11. 99%, 7. 79% and 5. 78%, and iteration times is reduced by 75. 63%, 59. 78% and 43. 67%, respectively in simple, general and complex environments, which indicates the effectiveness in optimal distance planning and obstacle avoidance of this improved algorithm. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Donghua University (Natural Science Edition) is the property of Journal of Donghua University (Natural Science) Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Scientiarum Naturalium Universitatis Pekinensis is the property of Editorial Office of Acta Scientiarum Naturalium Universitatis Pekinensis and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Chongqing University of Technology (Natural Science) is the property of Chongqing University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Natural Disasters is the property of Gai Kan Bian Wei Hui and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of the Chinese Society of Rare Earths is the property of Editorial Department of Journal of the Chinese Society of Rare Earths and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Guangdong Architecture Civil Engineering is the property of Guangdong Architecture Civil Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Petroleum Geology & Recovery Efficiency is the property of Petroleum Geology & Recovery Efficiency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To explore the influencing factors of respiratory function exercise behavior in patients with chronic obstructive pulmonary disease (COPD), and to construct a nomogram prediction model. 112 COPD patients in our hospital from March 2021 to March 2023 were selected, and patients were divided into low compliance group (n=68) and high compliance group (n=44) according to their respiratory function exercise behavior. The influencing factors of low compliance of respiratory function exercise behavior in COPD patients were analyzed by univariate analysis and multivariate logistic regression analysis, and a prediction model was constructed, the predictive value of the model was analyzed by receiver operating characteristic (ROC). Age≥ 60 years old, on the job, no family support, dyspnea after activity, high disease uncertainty, and low exercise self-efficacy were independent risk factors for low compliance of respiratory function exercise in COPD patients (P<0.05). The area under the curve (AUC) of age, on the job, family support, dyspnea after activity, disease uncertainty, exercise self-efficacy and nomogram prediction model were 0.645, 0.645, 0.717, 0.600, 0.660, 0.672 and 0.908 respectively, the prediction model had higher predictive value for low compliance of respiratory function exercise in COPD patients, when the cut-off value was 0.498, the sensitivity was 0.912 and the specificity was 0.795. The internal validation of the Bootstrap method (B=1000) showed that the predicted curve after the correction of the deviation was basically coincident with the ideal line, and the consistency index (C-index) was 0.816, indicating that the prediction ability of the model was better. The decision curve shows that the threshold probability range was 0.01~0.92, and the net return rate was>0. Age≥ 60 years old, on the job, no family support, dyspnea after activity, high uncertainty of disease, and low exercise self-efficacy are independent risk factors for low compliance of respiratory function exercise in COPD patients. The predictive model can help to assess exercise compliance and develop interventions. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Kunming Medical University / Kunming Yike Daxue Xuebao is the property of Kunming Medical Journal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Industrial Water Treatment is the property of CNOOC Tianjin Chemical Research & Design Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This study conducts numerical simulations to analyze the influence of the distance between roadway and fault fracture zone on the stability of excavation roadway surrounding rock during parallel roadway excavation with using the drilling and blasting method in the Julong Copper Mine. Numerical simulation models are established for different distances between roadway and fault fracture zone, and the variations in the displacement field, stress field, and plastic zone are analyzed. The numerical simulation results show that when the distance between roadway and fault fracture zone is 1 m and 4 m, the fault fracture zone has a significant impact on the stability of the surrounding rock of the roadway, with the maximum displacement values of the roadway side wall being 6. 19 cm and 1. 13 cm respectively. The maximum principal stress is concentrated in the left side surrounding rock of the roadway, with lesser stress in the right side surrounding rock. Horizontal stress is concentrated at the intersection of the surrounding rock and the fault fracture zone, and plastic deformation occurs within the fault fracture zone. When the distance between the roadway and the fault fracture zone is 7 m and 10 m, the influence of the fault fracture zone on the stability of the surrounding rock of the roadway is minor, with the maximum principal stress and horizontal stress approximately symmetrically distributed along the centerline of the influence, and no plastic deformation occurs within the fault fracture zone. [ABSTRACT FROM AUTHOR]

Copyright of Systems Engineering & Electronics is the property of Journal of Systems Engineering & Electronics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

慢光在未来全光网络通信中具有重要作用。文章提出一种基于零对比度光栅共振诱导透明效应的可实现平面外慢光滤波的设计,该设计兼具优良的透射滤波功能和慢光效应。分析了刻蚀深度和光栅周期对慢光滤波性能的影响,指出刻蚀深度影响波导层对共振诱导模式的束缚,刻蚀深度的改变将显著降低零对比度光栅的慢光滤波性能;而光栅周期主要影响入射光与波导模的相位匹配,选取不同光栅周期可在C波段实现对不同慢光滤波通道的选择。此外,研究了斜入射条件的模式劈裂效应,指出由于斜入射条件下非简并共振波导模的激发,±1级劈裂模式被激发,其虽然导致峰值透射的降低,但可以显著提高透射慢光的群折射率。该研究为慢光器件的设计提供了一种新的解决方案。

Copyright of Environmental Science & Technology (10036504) is the property of Editorial Board of Environmental Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Mechanical Strength / Jixie Qiangdu is the property of Zhengzhou Research Institute of Mechanical Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Andrology is the property of Chinese Journal of Andrology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Railway Standard Design is the property of Railway Standard Design Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

以气相法二氧化硅为载体,链状胺和环胺为功能化试剂,制得一系列二氧化硅-胺基复合载体,通过配位反应得到二氧化硅负载胺-钯(II)配合物,进一步还原得到二氧化硅负载胺-钯(0)配合物.采用IR、XRD、XPS、ICP技术对配合物进行表征,并研究了配合物的制备、反应条件以及配体差异对其催化碘苯与丙烯酸的Heck反应的性能.结果表明,该类催化剂在较低的温度下(70~90 ℃)即可较好地催化该反应,生成反式产物；还原后催化剂具有更好的催化活性和良好的重复使用性能；具有链状胺基配体的催化剂随着N原子数目的增加,催化活性呈上升趋势,而具有环状胺基配体的催化剂活性明显低于前者.

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Mining & Metallurgy (10057854) is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Ordnance Equipment Engineering is the property of Chongqing University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Science Research & Application is the property of Omniscient Pte. Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Management & Technology Discussion is the property of Omniscient Pte. Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Laser Technology is the property of Gai Kan Bian Wei Hui and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Rubber Industry is the property of Editorial Office of China Rubber Industry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The increasingly frequent illegal transactions hinder the secure transactions of Ethereum, and the anonymity of electronic currency makes it difficult to track and analyze illegal transactions. This paper used the transaction data of the Ethereum platform as the data source, the marked illegal account and unmarked normal account data set as the training set, and the characteristic attributes of the transaction data as the construction basis. Account for the overall forecast. The process uses the T-SNE algorithm to realize the dimensionality reduction and visualization of transaction features, adopts multiple cross-validation, and introduces the SHAP Value factor to judge the positive and negative attributes of the feature. The prediction effect accuracy rate of the established model reaches 94.29%. The evaluation metric for the area (AUC) value reached 0.9846. The proposed scheme can more accurately predict the illegal behavior on the Ethereum trading platform, and will effectively improve the blockchain-based trading environment. [ABSTRACT FROM AUTHOR]

【Objective】The study aimed to investigate and diagnose rice with yellowing disease in paddy fields transformed from dryland, so as to provide reference for improving farmland quality and ensuring food security in Guangxi.【Method】Exclusion, comparison and correlation analysis were adopted, and diagnostic methods of field investigation and laboratory analysis were used to analyze physical and chemical properties, pesticide residues, and pathogenic bacteria of major diseases in the soil and rice leaves from paddy fields transformed from dryland in Taodeng town and Gaoan township, Xingbin district, Laibin city, Guangxi for finding out the cause of rice yellowing disease in the paddy fields.【Result】The results of physical and chemical analysis showed that soil pH value, organic matter content, total nitrogen, total phosphorus and total magnesium in paddy fields transformed from dryland were significantly lower than those in control（P<0.05, the same as below） and manganese, copper, zinc, aluminum and arsenic in the paddy field were significantly higher than those in control. The contents of nitrogen, phosphorus and magnesium in rice infected with yellowing disease were significantly lower than those in CK, while the contents of manganese and copper were higher than those in CK. The residues of previous herbicides in the soil of paddy fields were significantly lower than those in the paddy field in control group. The pathogens of orange leaf disease and verticillium wilt were not detected in infected rice. It was ruled out that rice yellowing in new paddy field was caused by plant pathogenic microorganisms and herbicide residues. The results of the supplementary fertilizer test showed that the combination of ‘compound fertilizer + calcium magnesium phosphate fertilizer + urea’ failed to effectively correct the yellowing problem of rice in paddy field, while replacing part of the compound fertilizer with a new soil testing formula rice fertilizer could effectively correct the yellowing disease of rice in new paddy field, which was specifically manifested in the significant decrease of the yellowing plant rate and the diseased leaf rate of rice at late tillering, and the significant increase of rice yield.【Conclusion】The results of the comprehensive diagnosis show that the lack of magnesium and nitrogen in soil is the main reason for rice yellowing disease in paddy field. The yellowing symptoms were aggravated by the comprehensive factors of poor physical structure, low organic matter content, high acidity and active manganese, copper, arsenic content in paddy field transformed from dryland. The symptoms of rice yellowing can be effectively alleviated by targeted fertilization and improving the physical and chemical properties of paddy soil with multiple effects to achieve stable yield and harvest. [ABSTRACT FROM AUTHOR]