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海南自贸港封关运作对跨境电商发展的影响及相关制度设计研究

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国际贸易 2024年第4期 36-44页

作者：王健诸子怡对外经济贸易大学国际经济贸易学院

海南自贸港制度体系建设对跨境电商发展产生了影响:特殊的海关监管制度将使海南自贸港跨境电商业务范畴发生变化,货物贸易自由化措施将推动海南自贸港跨境电商多模式发展,独特的税制安排将减少税收制度对跨境电商进出口业务的阻碍,自贸... 详细信息

海南自贸港制度体系建设对跨境电商发展产生了影响:特殊的海关监管制度将使海南自贸港跨境电商业务范畴发生变化,货物贸易自由化措施将推动海南自贸港跨境电商多模式发展,独特的税制安排将减少税收制度对跨境电商进出口业务的阻碍,自贸港服务贸易及投资开放政策将有助于跨境电商完善服务。与此同时,海南自贸港关于跨境电商的制度设计仍有进一步完善的空间:现有国内的跨境电商监管方式或将不再适用海南自贸港,跨境电商零售进口商品清单或将不适用于海南自贸港,跨境电商生态化服务的发展将成为海南自贸港跨境电商发展的重要方向。未来,海南自贸港可完善促进跨境电商发展的相关政策,进一步放大跨境电商在海南自贸港发展的优势。

关键词：跨境电商海南自贸港制度创新

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DMA-Trans: A Difference Metric Attention with Position Distancebased Weighting for Transformer in Data Sequence Modeling of Industrial Processes

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DMA-Trans: A Difference Metric Attention with Position Dista...

Recognition of the inducible,secretory small protein OsSSP1 by the membrane receptor OsSSR1 and the co-receptor OsBAK1 confers rice resistance to the blast fungus

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作者： ziyi Yang Xiaofeng Yuan Kai Wang Yalin Wang Chunhua Yang Weihua Gui School of Automation Central South University

Accurate feature extraction and quality variable prediction are critical problems for time sequences in industrial processes. However, industrial samples are often time-relevant and have strong correlations with each other that has different positional distance, making it challenging for conventional data-driven models like LSTM and Vanilla Transformer to capture these underlying features. In this paper, A Difference Metric Attention with Position Distance-based Weighting is proposed for Transformer(DMA-Trans) in industrial time series modeling. Firstly, the Difference Metric Attention is established to calculate the difference of query-key vector pair to measure the spatial similarity. In this fashion, the difference can accurately represent the similarity of vectors, compared with the original dot product by directly using any two vectors. Then, Positional Distancebased Weights are designed to capture the distance relevance of samples that have different positional distance. This information may help to extract more potential features because the closer samples tend to have higher relevance while there are weak correlations if samples are far in distance. The effectiveness of the DMA-Trans model is validated in industrial hydrocracking processes for C5 content in the light naphtha and the final boiling point of jet fuel.

关键词： Soft sensor Attention mechanism Dot product Quality prediction Transformer

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Molecular Plant 2024年第5期17卷 807-823页

作者： Tianfeng Zhao Shijie Ma ziying Kong Haimiao Zhang Yi Wang Junzhe Wang Jiazong Liu Wanzhen Feng Tong Liu Chunyan Liu Suochen Liang Shilin Lu Xinyu Li Haipeng Zhao Chongchong Lu Muhammad Zunair Latif ziyi Yin Yang Li Xinhua Ding State Key Laboratory of Crop Biology Shandong Provincial Key Laboratory for Biology of Vegetable Diseases and Insect PestsCollege of Plant ProtectionShandong Agricultural UniversityTaian 271018ShandongChina College of Breeding and Multiplication(Sanya Institute of Breeding and Multiplication) Hainan UniversitySanya 572024HainanChina

The plant apoplast,which serves as the frontline battleground for long-term host–pathogen interactions,harbors a wealth of disease resistance ***,the identification of the disease resistance proteins in the apoplast is relatively *** this study,we identified and characterized the rice secretory protein OsSSP1(Oryza sativa secretory small protein 1).OsSSP1 can be secreted into the plant apoplast,and either in vitro treatment of recombinant OsSSP1 or overexpression of OsSSP1 in rice could trigger plant immune *** expression of OsSSP1 is suppressed significantly during Magnaporthe oryzae infection in the susceptible rice variety Taibei 309,and OsSSP1-overexpressing lines all show strong resistance to *** the knockout and overexpression results,we found that OsSSP1 positively regulates plant immunity in response to fungal ***,the recognition and immune response triggered by OsSSP1 depend on an uncharacterized transmembrane OsSSR1(secretory small protein receptor 1)and the key co-receptor OsBAK1,since most of the induced immune response and resistance are lost in the absence of OsSSR1 or ***,the OsSSP1 protein is relatively stable and can still induce plant resistance after 1 week of storage in the open environment,and exogenous OsSSP1 treatment for a 2-week period did not affect rice ***,our study reveals that OsSSP1 can be secreted into the apoplast and percepted by OsSSR1 and OsBAK1 during fungal infection,thereby triggering the immune response to enhance plant resistance to *** findings provide novel resources and potential strategies for crop breeding and disease control.

关键词： rice plant apoplast OsssP1 receptor plant resistance Magnaporthe oryzae

场景功能·精神观照·历史书写:电影空间形态的多元样式论

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电影评介 2024年第1期 28-33页

作者：宋姿颐北京电影学院视听传媒学院

作为一门结合时间与空间表现方式的综合艺术,电影以平面化的形式构成容纳各种多元化的“空间”概念,其中既有电影影像与叙事中的地理景观,又有观影者将平面投射为立体、将片段空间投射为连续空间的知觉作用,还有蕴含文化与历史的复杂空... 详细信息

作为一门结合时间与空间表现方式的综合艺术,电影以平面化的形式构成容纳各种多元化的“空间”概念,其中既有电影影像与叙事中的地理景观,又有观影者将平面投射为立体、将片段空间投射为连续空间的知觉作用,还有蕴含文化与历史的复杂空间景观书写等。在早期电影的分析与批评中,视觉本位的信息往往被故事的变化与主题压制,电影空间则作为故事或角色经历的一部分藏于幻想之中。随着近年来多学科研究的空间转向日益凸显,电影的空间形态表述逐渐演变为电影研究的新切入点之一。

关键词：电影空间多学科研究早期电影地理景观空间形态历史书写空间转向连续空间

Evolution of the historical polder landscape in the ancient Danyang wetland,lower Yangtze River,China,during the last 3000 years

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Journal of Geographical Sciences 2024年第10期34卷 2053-2073页

作者： HU Xiaosi WU Li ZHUANG Yijie WANG Xinyuan MA Chunmei LI Linying GUAN Houchun LU Shuguang LUO Wenjing XU ziyi Provincial Key Laboratory of Earth Surface Processes and Regional Response in the Yangtze-Huaihe River Basin School of Geography and TourismAnhui Normal UniversityWuhu 241002AnhuiChina Institute of Archaeology University College LondonLondon WC1H OPYUK Aerospace Information Research Institute CASBeijing 100094China School of Geographic and Oceanographic Sciences Nanjing UniversityNanjing 210023China Anhui Institute of Geological Sciences Hefei 230001China

Polder is a type of irrigation field unique to the lower Yangtze River of *** is a product of long-term and ingenuous human modifications of wetland *** the pre-Qin Period,3000 years ago,the poldered area of eastern Wuhu city was once a large lake called the ancient Danyang *** introduction of agricultural civilization and polder technology to the area during the Wu and Yue Kingdoms period gradually transformed it into an agricultural *** an accelerating rate of land reclamation under a changing late-Holocene regional climate,the ancient Danyang wetland became an aquatic system strongly influenced by intensifying anthropogenic *** this study,based on field survey data,historical documents,and remote-sensing and archaeological data,we reconstructed the spatial distribution of the polder landscape over the last 3000 years and identified their structural *** found that polder landscapes began to emerge in the Spring and Autumn Period,land reclamation intensified in the Three Kingdoms and developed rapidly in the Song Dynasty before eventually reaching the peak from the Ming and Qing *** relocation of historical sites to low-altitude areas also marked the expansion of poldered fields from the center of the wetland to the southeast and *** development and evolution of the polder landscape are related to regional climate conditions,changing social and economic statuses,and the development of agricultural technology in the Song Dynasty and succeeding periods.

关键词： ancient Danyang wetland polder landscape climate change anthropogenic activities lower Yangtze River

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一种适合宽范围输出的双向DC-DC变换器

电机与控制学报 2024年第2期28卷 152-161页

作者：袁义生卢梓意刘伟华东交通大学电气与自动化工程学院江西南昌330013

提出一种适合宽范围输出的双向DC-DC变换器。该变换器结构与传统LLC双向DC-DC变换器类似,但通过开关管复用以及将谐振电感增加绕组复用为一个反激变压器,构造了多种工作模式。变换器采用PWM调制,正向功率传输时有中、低两种电压增益模式... 详细信息

提出一种适合宽范围输出的双向DC-DC变换器。该变换器结构与传统LLC双向DC-DC变换器类似,但通过开关管复用以及将谐振电感增加绕组复用为一个反激变压器,构造了多种工作模式。变换器采用PWM调制,正向功率传输时有中、低两种电压增益模式,反向功率传输时有高、中、低三种电压增益模式,所有模式中均可实现全负载范围内的软开关状态。对各模式的工作原理、增益公式推导进行了详细的描述。最后以满足4-5节12 V蓄电池的充放电为前提,给出变换器设计和控制方法,并搭建了相应参数的实验样机。实验结果验证了该变换器分析的有效性。

关键词：双向DC-DC变换器宽范围多模式谐振软开关

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Fe-MOF-74前体制备铁-碳/氮复合材料及其活化过硫酸盐性能

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化工学报 2024年第5期75卷 1882-1889页

作者：张林张子怡李勇童少平浙江工业大学化学工程学院浙江杭州310032

利用Fe-MOF-74和g-C_(3)N_(4)前体制备了复合材料铁-碳/氮(记为Fe-MOF-C/N),并研究了其活化过硫酸氢钾(PMS)的性能。XRD、SEM和XPS分析表明,Fe-MOF-C/N呈多孔状结构,主要由物相Fe3N、C0.08Fe1.92和石墨组成。利用Fe-MOF-C/N活化PMS降解双酚A(BPA)结果表明,与前期的Fe-C/N-0.5∶1(由FeC_(2)O_(4)和g-C_(3)N_(4)制备)相比,Fe-MOF-C/N具有更优异的催化性能,相同条件下Fe-MOF-C/N/PMS对BPA的降解率达95.21%(6 min),比Fe-C/N-0.5∶1/PMS高30.4%。优化相应的实验条件后,6 min内BPA的化学需氧量(COD)去除率达59.72%。自由基猝灭实验表明,Fe-MOF-C/N/PMS的活性物种主要是^(1)O_(2)。稳定性实验表明Fe-MOF-C/N稳定性较好,使用5次后,BPA的降解率仅下降9.0%,应用前景良好。

关键词：高级氧化活化过硫酸氢钾降解复合材料金属有机框架

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考虑参考价格效应的中断供应链动态恢复策略

系统工程理论与实践 2024年第4期44卷 1268-1281页

作者：孟庆春朱子怡谢磊薛小乐山东大学管理学院济南250100 山东省高等学校数智管理与决策模拟实验室济南250100

为了满足供应中断后的时变需求,恢复决策需随时间调整,而普遍的静态策略无法描述这一过程.文章基于微分博弈理论,在静态恢复策略的基础上提出了动态恢复策略,考虑在有限恢复计划期内参考价格效应对动态需求的影响,分析最优供应恢复努力... 详细信息

为了满足供应中断后的时变需求,恢复决策需随时间调整,而普遍的静态策略无法描述这一过程.文章基于微分博弈理论,在静态恢复策略的基础上提出了动态恢复策略,考虑在有限恢复计划期内参考价格效应对动态需求的影响,分析最优供应恢复努力水平和参考价格最优轨迹,并进一步设计双向成本补贴契约实现供应链协调.研究发现:相比于静态恢复策略,动态恢复策略对各方更有利,其最优供应恢复努力水平随时间以递减的速率降低;对于持续时间较长的中断和忠诚度高且对参考价格敏感的消费者,供应链成员倾向于投入更大的恢复努力水平并采用契约协调供应链;在双向成本补贴契约下,只有当供应商和制造商的边际利润占比差距较小时,双向成本补贴契约能够实现双方的帕累托改进.最后拓展分析考虑贴现因子的情形,验证了模型的鲁棒性.本研究可为有限时域内考虑消费者行为要素的供应链动态恢复管理提供决策支持.

关键词：供应链中断动态恢复微分博弈参考价格效应

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Research on Total Electric Field Prediction Method of Ultra-High Voltage Direct Current Transmission Line Based on Stacking Algorithm

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Computer Systems Science & Engineering 2024年第3期48卷 723-738页

作者： Yinkong Wei Mucong Wu Wei Wei Paulo R.F.Rocha ziyi Cheng Weifang Yao Key Laboratory of Operation and Control of Terraced Hydropower Plants in Hubei Province Three Gorges UniversityYichang443002China School of Electricity and New Energy Three Gorges UniversityYichang443002China Marketing Service Center(Metering Center) State Grid Hubei Electric Power Co.Ltd.Wuhan430072China Centre for Functional Ecology-Science for People&the Planet Associate Laboratory TERRADepartment of Life SciencesUniversity of CoimbraCoimbra3000-456Portugal Research Institute of Electric Power Science State Grid Anhui Electric Power Company LimitedHefei230601China

Ultra-high voltage(UHV)transmission lines are an important part of China’s power grid and are often surrounded by a complex electromagnetic *** ground total electric field is considered a main electromagnetic environment indicator of UHV transmission lines and is currently employed for reliable long-term operation of the power ***,the accurate prediction of the ground total electric field remains a technical *** this work,we collected the total electric field data from the Ningdong-Zhejiang±800 kV UHVDC transmission project,as of the Ling Shao line,and perform an outlier analysis of the total electric field *** show that the Local Outlier Factor(LOF)elimination algorithm has a small average difference and overcomes the performance of Density-Based Spatial Clustering of Applications with Noise(DBSCAN)and Isolated Forest elimination ***,the Stacking algorithm has been found to have superior prediction accuracy than a variety of similar prediction algorithms,including the traditional finite *** low prediction error of the Stacking algorithm highlights the superior ability to accurately forecast the ground total electric field of UHVDC transmission lines.

关键词： DC transmission line total electric field effective data multivariable outliers LOF algorithm Stacking algorithm