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脑机接口是一项新兴的技术，它可以处理分析采集到的运动想象脑电信号，从而实现对外部辅助设备的控制。针对目前运动想象脑电信号处理方法计算效率低、分类准确率不高等问题，提出了一种新的基于噪声辅助快速多维经验模式分解（NA-FMEMD）的运动想象脑电信号分类方法。该方法首先利用 NA-FMEMD 得到全部的多维本征模式函数和趋势项；接着，根据平均频率选取特定的信号层，构建出新的多维信号；然后，通过共空间模式提取出脑电信号的特征向量；最后，将特征向量输入支持向量机分类器中进行分类。分别采用仿真数据和BCI Competition IV数据进行测试，并与基于噪声辅助多维经验模式分解（NA-MEMD）的方法进行比较，验证了所提方法的有效性和优势。

Based on daily ground observation data from 11 national meteorological stations in Xianyang City from 1971 to 2022, the distribution pattern and meteorological factors of frost were analyzed using methods such as linear tendency estimation, Mann-Kendall mutation test and relevant statistical analysis. The results showed that the first frost days in all counties (districts) of Xianyang were from mid-October to early November, and the last frost days were from late March to late April, the frost-free period in the north was short and in the south was long, showing that the first frost day was delayed, the last frost day was advanced, and the frost-free period extended significantly. In 2004, 2007 and 2005, the first frost date, the last frost date and the frost-free date were significantly delayed, advanced and prolonged respectively; the radiation frost was the most in the first frost period, the less cloud cover, the more frost days, the lower relative humidity and ground lowest temperature, the lower frost rate. The final frost period was mainly mixed frost, which had little relation with cloudiness. Compared with the first frost period, the humidity was lower, the temperature was higher and the wind speed was stronger. [ABSTRACT FROM AUTHOR]

Copyright of Food & Fermentation Industries is the property of Food & Fermentation Industries 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.)

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In order to maintain the consistency of cigarette blending for regular cigarette maintenance, it is necessary to supplement or substitute single-grade tobacco strips in the blend from time to time. Therefore, a cigarette blend maintenance strategy based on mutual information was proposed. The co-occurrence frequency of single-grade tobacco strips in a cigarette blend and the mutual information between single-grade tobacco strips in pairs were calculated after analyzing the blending data. The mutual information allowed the compatibility between the single-grade tobacco strips to be assessed for blend maintenance. The results showed that: 1) This blend maintenance strategy could successfully restore a target blending in the actual production process. 2) This approach effectively took compatibility as a consideration factor to ensure that the new blend had good compatibility in the blend maintenance process with the rank average of missing single-grade strips of 6.585. 3) The proposed measurement index and the associated effect algorithm solved the challenge of effect measurement during single-grade tobacco replacement with unequal quantity. It could also measure the batch-to-batch single-grade tobacco replacement with unequal quantity in actual production process. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Shanghai University / Shanghai Daxue Xuebao is the property of Journal of Shanghai University (Natural Sciences) 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.)

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I he aim of this paper is to explore the student evaluation system of research type tutors. The construction of student evaluation system of research type tutors contains the whole course of the college students innovation and pioneering projects. According to the characteristics of the students and the requirements of the university tutorial system, the content and form of evaluation are determined, and the evaluation system is constructed. The project application stage, project implementation stage and project conclusion stage were evaluated hv the apparent and hidden evaluation. The effectiveness of the evaluation system is very successful, it will offer some references to the practices of the tutorial system teaching management. [ABSTRACT FROM AUTHOR]

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Based on theoretical analysis, numerical computation and experimental analysis, the multi-category stress distribution of civil ladder under different kinds of static load was studied, and the target ladder in normal state of use was with modifiable opening angles. The research focused on different classes of strain of a civil ladder under two static loads which were of the same value but different locations when the modifiable opening angle was left unchanged. The paper firstly studied the overall response of the civil ladder under designed loads through finite element analysis, and then, the force conditions, stress conditions, displacement conditions and deformation conditions of the footboard of the civil ladder, as well as the maximum half opening angle of safe use were studied through theoretical calculations. Based on them, the experimental design and the corresponding numerical calculation were confirmed. The conclusion comes from comparing the actual experimental result and calculation result. Apart from this, considering the actual situation, the paper resulted with a function formula between the maximum strain of each kind and the location of the two loads through polynomial fitting, which is an empirical formula. According to the formula, we can make security assessment and checking through practical applications. [ABSTRACT FROM AUTHOR]