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太阳风暴在电力系统网络中驱动产生的GIC会影响电力设备和系统的安全运行, 严重时还会引发大面积停电事件. 预测电网GIC水平能够为电力系统保护措施提供重要参考, 然而对这方面的研究仍显不足. 为了解决该问题, 将卷积神经网络(CNN)与双向长短时记忆(BiLSTM)以及注意力机制相结合, 利用空间天气的相关监测信息, 提出了大规模电网GIC多时间长度的预测方法. 本文在分析太阳风暴驱动产生电网地磁感应电流GIC (Geomagnetically Induced Current, GIC)基础上, 构建了GIC预测模型; 提出了基于多头注意力机制的CNN-BiLSTM改进模型, 对GIC进行预测, 并给出了预测流程. 采用CNN捕获地磁扰动局部信息, 根据BiLSTM综合地磁暴扰动信息的全局特征, 综合利用多头注意力机制评估对GIC关键作用的地磁信息片段, 实现电网GIC的预测. 利用2004年11月8日00:00 LT－20:00 LT巨型磁暴期间DED地磁台站和QGZH地磁台监测数据, 应用所提方法对岭澳500 kV变电站GIC进行回归预测. 经过训练后, GIC预测相对误差均在12%以内, 精度高于其他模型的预测结果.

针对可移动非接触式月球表面电位探测器的电位无扰动测量单元对低能远焦电子束的需求，设计了低能远焦电子枪。以平板二极管电子枪为电子源，匹配两个静电聚焦透镜，将电子源引出的发散电子束聚焦为需要的形状，并加速至所需能量。优化电子枪的几何参数以及施加在电极上的电位，电子枪引出的电子束能量在5~500 eV内，并且具有良好的电子光路特性。电子束能量为5 eV时，初始半径r为5 mm，束腰至电子枪出口的距离p约为133 mm。随着能量增加，r逐渐减小至500 eV时的3 mm左右，p逐渐减小至105 mm。电子束经月球表面电场反射被电子收集平极接收，仿真数据和理论分析结果均表明，电子枪的工作距离为400~600 mm，平板接收的电子占发射电子比例在96%以上。电子枪结构质量仅408 g，满足探测器对电子枪的质量需求。

东北虎(Panthera tigris altaica)是国家一级重点保护野生动物,在人工饲养环境下,对东北虎幼崽及其母虎活动的精准跟踪是研究东北虎幼崽成长过程中行为发育、观测东北虎个体健康状况的重要手段。本研究提出了一种轻量型的GhostNet-DeepSORT算法来实现在监控视频下的东北虎幼崽群体活动的多目标跟踪。该算法的测试结果表明:东北虎幼崽个体目标检测的召回率和平均精度均值分别是94.9%和96.2%,东北虎幼崽多目标跟踪准确度(MOTA)和精确度(MOTP)分别是91.6%和88.2%。通过轻量化操作处理后的GhostNet-DeepSORT算法,在MOTA保持不变时,MOTP提升了1.25%,而且模型占用内存从45.4 MB减小到6.5 MB。因此,相对于DeepSORT算法而言,GhostNet-DeepSORT算法在保证跟踪精度的同时更适用于算力资源不足的小型设备,相比于由宽残差网络构成的重识别网络,采用GhostNet网络进行模型的轻量化替代,实现在视频中东北虎个体重识别。该跟踪算法的实现也为后续圈养东北虎幼崽个体行为识别和个体健康的便捷和快速评估研究提供必要的技术支撑。

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Chemical measurement experiments is one of the twelve core courses of the Chemistry "101 Plan" of the Ministry of Education, which absorbs and integrates a number of experiments in several chemical laboratory courses. It has a new experimental curriculum architecture. Through this course, students will not only understand the principles of instruments, but also be able to use advanced scientific instruments to measure the structure, properties and performance of matters, and even be able to design and build instruments by themselves. This paper mainly introduces methodologies for improving classroom practice in the chemical measurement experiments course to promote the communication and mutual learning among teachers in classroom teaching practice. These practices may effectively improve the teaching level of chemical measurement experiments in China. [ABSTRACT FROM AUTHOR]

Chemical measurement experiments are one of the four core experimental courses of the chemistry "101 Plan" of the Ministry of Education. This paper provides an in-depth introduction to main ideas in designing the course, including the positioning, objectives, designing strategy, modules, knowledge points and contents of the chemical measurement experiments course. We also give suggestion on how to make full use of this course and refine the course to exert the advantage of the respective university. The main purpose of this article is to promote the reform and innovation of experimental teaching in universities involved in national basic subject talent training plan and other key universities through this course, and to improve the cultivation quality of top-notch innovative talents. [ABSTRACT FROM AUTHOR]

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Objective To investigate the relationship of replication factor C subunit 2 (RFC2) with the prognosis of glioblastoma (GBM) and cell proliferation, as well as its underlying molecular pathway in GBM development. Methods Using bioinformatics methods, cell cycle genes were screened as independent prognostic factors for GBM. Combined with clinical indicators, a risk scoring model for GBM patients was established and validated. The target gene RFC2 was analyzed with GO, KEGG, and GSEA. U87 GBM cells at logarithmic growth stage were transfected with lentivirus and divided into different groups(control, ShRFC2 #1, and shRFC2#2 groups). qRT-PCR, Western blotting, Edu staining, and cloning assay were used to detect mRNA expression, protein expression, and cell proliferation. Results The expression of RFC2 was upregulated in GBM and showed an obvious upregulation trend with the increase of pathological grade of glioma. The analyses of gene function and pathway indicated that RFC2 was involved in the processes of sister chromosome segregation, chromosome segregation, organelle fission, and mitosis by promoting the transition of G1 to S phase during cell cycle. qRT-PCR and Western blotting showed that compared with the control group, the amount of mRNA and translated protein in the knockdowned groups decreased(P<0.000 1). The positive rate of Edu staining and the colony forming ability decreased (P<0.000 1, P<0.001). Conclusion RFC2 is highly expressed in glioblastoma and associated with pathological grade of glioma and poor prognosis of patients. It also promotes the cell proliferation function of glioblastoma. RFC2 may be a potential biomarker and therapeutic target for glioblastoma. [ABSTRACT FROM AUTHOR]

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Copyright of Science & Technology of Cereals, Oils & Foods is the property of Science & Technology of Cereals, Oils & Foods 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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Copyright of Chinese Journal of Dermatovenereology is the property of Xi'an Jiaotong University Periodicals Center 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 Chinese Institute of Food Science & Technology / Zhongguo Shipin Xuebao is the property of Journal of Chinese Institute of Food Science & Technology Periodical 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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[Objective]The aims of this study are to examine the response of ecosystem service value(ESV)to the change in land use and landscape pattern, and to provide reference for maintaining the functional stability of the ecosystem in northeast of Jiangxi Province and building a regional ecological safety barrier.[Methods]Based on four periods of land use data from 1990 to 2020, the spatial and temporal change of land use, landscape pattern and ESV in northeast Jiangxi were measured by spatial analysis and statistics within Geographic Information System(GIS)package. Meanwhile, the elasticity coefficient and Geographically and Temporally Weighted Regression(GTWR)model were respectively introduced to explore the impacts of land use and landscape pattern change on ESV.[Results](1)Woodland and cultivated land were the main land use types, and except for the increase in waters and urban area, other land use had experienced a decrease, which made regional landscape fragmented and complicated.(2)The total amount of ESV had gained an increase with woodland and waters being the main contributors to the ecosystem, accounting for over 89％of the total. The distribution and changes of ESV in various counties were mainly influenced by waters, woodland and urban area.(3)The regions with the highest elasticity coefficient(EC)(＞5)were mainly located along the Poyang Lake and its water system, and around the prosperous area of each county center, while the areas with high EC(i.e., 3＜EC≤5)mainly distributed around the borders of the study area, (4)The influence of the Interspersion and Juxtaposition Index(IJI)and Splitting Index(SPLIT)on ESV in each county was mainly a negative inhibition, and the influence of the Euclidean Nearest Neighbor Distance(ENN)was transitional from negative to positive while the influence of the Shannon's Diversity Index(SHDI)was generally positive and its intensity had been gradually increasing.[Conclusion]The influence intensity of the four landscape indices shows a clear spatiotemporal difference. The effect of change in land use and landscape pattern on ESV are also of spatiotemporal variability and should be treated differently in ecological and environmental protection in the study area. [ABSTRACT FROM AUTHOR]

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Establishment of rat models of liver transplantation provides an ideal animal model for resolving the problems of postoperative complications and perioperative treatment of liver transplantation. With in-depth study of the establishment of rat models of liver transplantation, classic "two-cuff" technique has been gradually employed. However, poor surgical field, vascular torsion, biliary tract injury and long anhepatic phase remain unresolved in the process of liver transplantation using traditional techniques. At present, the rat models of liver transplantation at home and abroad are modified mainly from the reconstruction of four vital anatomic structures including the suprahepatic inferior vena cava, portal vein, infrahepatic inferior vena cava and bile duct. Therefore, the latest progress in the reconstruction of the suprahepatic inferior vena cava, portal vein, infrahepatic inferior vena cava and bile duct was reviewed, aiming to provide reference for the establishment of rat models of liver transplantation and promote further development of liver transplantation techniques. [ABSTRACT FROM AUTHOR]

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