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由于用户级综合能源系统（integrated energy system，IES）的多元负荷序列之间复杂的耦合关系及易受外部因素影响等原因，综合能源系统多元负荷的精准预测面临很大困难。为此，提出一种基于Spearman相关性分析阈值寻优（threshold optimization，TO）和变分模态分解结合长短期记忆网络（variational mode decomposition based long short-term memory network，VMD-LSTM）的多元负荷预测方法。首先，使用斯皮尔曼等级（Spearman rank，SR）相关系数定量计算多元负荷间以及负荷与其他气候因素间的相关关系并通过循环寻优确定最优相关阈值，然后采用VMD算法将以最优阈值筛选出的负荷特征序列分解成更简单、平稳、有规律性的本征模态函数（intrinsic mode function，IMF）后与最优气象特征一起输入LSTM模型进行负荷预测。通过某用户级IES的实际数据对所提方法的有效性进行了验证，结果表明，所提方法能有效提高IES的多元负荷预测精度。

地磁导航是通过对地球周围矢量磁场进行测量从而实现导航的一种方法. 地磁导航在运动平台上应用的难点之一是平台剩磁对地磁测量的影响, 严重污染了磁强计的测量. 消除平台剩磁对地磁测量的影响是地磁导航向应用转化的一项关键技术. 为实现运动平台剩磁的有效测量与估计, 提出了基于递推最小二乘法的运动平台剩磁差分测量与估计方法. 基于载体干扰磁场值只与测量点到磁偶极子的距离和磁偶极子的磁矩有关的结论, 根据磁偶极子的磁场分布特性, 推导出一种基于内置磁强计阵列的运动平台剩磁差分估计模型, 并通过递推最小二乘法求解差分估计模型. 大量仿真实验表明, 可以通过内置阵列磁强计对平台剩磁进行测量与估计, 验证了所提出的平台剩磁估计方法的有效性.

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Copyright of Science & Technology of Food Industry is the property of Science & Technology of Food Industry 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.)

提出了一种改进的Bhattacharyya 距离，用以度量2 个协方差矩阵之间的差异性，简称为SΣ 距离。证明了该距离在正定矩阵空间中满足距离的3 条性质：正定性、对称性以及三角不等性，并将SΣ 距离用于高斯网络协方差矩阵的灵敏度分析。数值实验结果表明，利用SΣ 距离得到的分析结果与KL 距离、Bhattacharyya 距离完全一致，由于SΣ 距离满足三角不等性，大大降低了矩阵的运算量。

为了降低红绿蓝发光二极管（RGB-LED）可见光通信系统解复用过程中滤光造成的光能量损失,设计了一种基于分光解复用法的RGB-LED可见光通信系统。介绍了分光解复用法的原理和结构组成,对比了分光解复用法与常用的滤光解复用法在解复用过程中的光能量损失,由对比结果可知,分光解复用法可降低滤光造成的光能量损失,提高光源的利用率。利用光通信仿真软件对通信系统进行了仿真测试,仿真结果显示,在相同误码率条件下,采用分光解复用法的系统能有效延长信号的传输距离。

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The temperature difference of fruit itself will affect its near infrared spectrum and the accuracy of its soluble solids content (SSC) prediction model. To eliminate the influence of apple temperature difference on the SSC model, a diffuse transmission dynamic online detection device was used to collect the spectral data of apples at different temperatures, and four methods were used to establish partial least squares correction models: global correction, orthogonal signal processing, generalized least squares weighting and external parameter orthogonal (EPO). The results show that the temperature has a strong influence on the diffuse transmission spectrum of apples. The 20 ºC model can get a satisfactory prediction result when the temperature is constant, and there will be great errors when detecting samples at other temperatures. The effect of temperature must be corrected to establish a more general model. These methods all improve the accuracy of the model, with the EPO method giving the best results; the prediction set correlation coefficient is 0.947, the root mean square error of prediction is 0.489%, and the prediction bias is 0.009%. The research results are of great significance to the practical application of SSC prediction of fruits in sorting workshops or orchards. [ABSTRACT FROM AUTHOR]

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探讨互联网信息搜索中用户与网络交互的行为模型.要求32名大学生或研究生被试完成不同类型（开放型与封闭型问题）的信息搜索任务，记录整个搜索过程，并提取各类关键事件的发生频次和时间等数据进行分析.基于路径分析获得的用户搜索行为模型显示：任务类型因素通过“主题目录链接”与“相关链接”的相关对搜索时间产生非因果效应；个体因素通过“页面跳转”对搜索时间产生间接因果效应，通过“相关链接”对绩效产生间接因果效应；环境因素通过“浏览时间”和“提交请求”对搜索时间产生间接因果效应.

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将正硅酸乙酯与HCl水解,加入HF与发烟二氧化硅的混合物充分地分散,再加NH4OH溶液将溶胶的pH值调到4.5,溶胶倒入聚四氟模具凝胶,然后干燥成干胶并烧成石英玻璃。制得石英管外径为20mm、壁厚2.5mm、长250mm,从湿胶到石英管的收缩比是50%,干胶不易破裂,成品率达90%。

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摘 要 将钛涂层317L 接骨板植入电子线照射的犬右下颌骨体部, 用透射电镜(TEM)观察相邻骨膜超微 结构变化, 结果显示, 钛涂层317L 接骨板组相邻骨膜超微结构损伤比未喷涂钛层的317L 接骨板对照组轻微。 可能与未喷涂钛层的317L 接骨板所释放出来的毒性较大的C r 、Ni 离子对组织细胞的再损伤有关, 而钛涂层 317 L 接骨板表面呈纯钛相, 不会造成组织细胞超微结构明显损伤。

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本文介绍了光纤光缆用新型油膏的特性，通过对五种油膏分别进行长达几百至１０００多小时的分油测试，探讨了各种油膏分油随时间变化的规律，对各种油膏的长期分油作了有依据的预估，对各种油膏的分油性能作了比较。

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