spatial

摘要： Spatially resolved transcriptomics methodologies using RNA sequencing principles have and will continue to contribute to decode the molecular landscape of tissues.Linking quantitative sequencing data with tissue morphology empowers profiling of cellular morphology and transcription over time and space in health and disease.To view this SnapShot,open or download the PDF.

摘要： According to the characteristics of manifold and the double helix structure of spacetime, four coordinate systems are established as reference frames. The grand parity principle and the general exclusion principle are proposed. The minimum action distance of electromagnetic force is obtained and the structure of intrinsic space of particle is studied. The stability of particle reaction, the reason for only three generations of leptons and the spatial significance of the electroweak equivalence are discussed by using the two principles and the four coordinate systems. The behavior of boson including condensation is described in terms of spatial structure. Finally, we suggest that symmetry between the field excited by charge and the field excited by mass should be further investigated.

摘要： Spatially resolved transcriptomics methodologies using RNA sequencing principles have and will continue to contribute to decode the molecular landscape of tissues.Linking quantitative sequencing data with tissue morphology empowers profiling of cellular morphology and transcription over time and space in health and disease.To view this SnapShot,open or download the PDF.

摘要： [Objectives]To explore the effects of spatial density of farmland shelterbelts on NDVI on the northern slope of Tianshan Mountains.[Methods]Taking the economic belt of the northern slope of the Tianshan Mountains as the research area and using the grid method,the spatial density distribution of farmland shelterbelts can be known.Combining the grid method with NDVI data,the average value of normalized difference vegetation index(NDVI)during the growing period of crops can be obtained.In addition,the protection benefits of the shelterbelts on crops were analyzed through comparing the growth of crops within the protection zone with and without protection.[Results]The grids with shelterbelt distribution were better than the grids without shelterbelt distribution,and the shelterbelt played a great role in promoting crop growth.In the middle stage of crop growth,the protection benefit of shelterbelt was significant.The spatial density of shelterbelts was unevenly distributed in the range of 0.6 to 0.8,and the protection benefits were poor.[Conclusions]It is expected to explore the effects of shelterbelts on crop growth at a larger regional scale,so as to provide a basis for the management and design of shelterbelts in the future,and to provide a theoretical basis for studying the protective effect of farmland shelterbelts on crops.

摘要： [Objectives]To study the temporal and spatial variation of SOC content in cultivated land in black soil region in Liaoning Province.[Methods]Through the evaluation and analysis of the research data of this project and the data of the second national soil census,and using GIS technology,this paper studied the temporal and spatial variation characteristics of SOC in the black soil region of Liaoning Province,and provided a basis for improving cultivated land carbon storage and soil organic matter content.[Results]Since 1980,the SOC content in cultivated land in the black soil region in Liaoning Province has generally declined,and the spatial distribution difference has gradually decreased.From 1980 to 2018,the homogeneity of SOC distribution weakened,and the variation in a small range strengthened.The SOC content generally showed the characteristics of increase and decrease,and the changes in the area were scattered.[Conclusions]This study is of great significance to the sustainable utilization of land resources.

摘要： Regarding the spatial and seasonal variations of dinoflagellates in different salinities regimes,Prorocentrum rostratum showed a strong correlation with high salinity(≥29 ppt.).However,P.micans had a negative correlation with salinity.In Dinophysoids,Dinophysis caudata showed a wide salinity tolerance than other species in the group.D.miles,Ornithocercus magnificus,O.steinii,and O.thumii showed a strong correlation with salinity.In Gonyaulacoids,Ceratium furca,C.fusus,C.horridum,C.trichoceros,C.tripos,Gonyaulax polygramma,G.spinifera,and Pyrophacus magnificus showed a strong correlation with salinity.In Peridinoids,Protoperidinium depressum,P.oblongum,P.oceanicum,P.pyreforme,and Podolampus palmipes showed a strong correlation with salinity.In Gymnodinoid and Noctilucoid,Gyrodinium estuariale and N.scintillans showed a strong correlation with salinity.

摘要： Following publication of the original article[1],the keywords are missing in the article.Keywords:Photoacoustic microscopy,Spatial weight matrix,Dimensionality reduction,Distortion correction,Mutual information The original article has been updated.

摘要： Repolarization heterogeneity(RH)is an intrinsic property of ventricular myocardium and the reason for T-wave formation on electrocardiogram(ECG).Exceeding the physiologically based RH level is associated with appearance of life-threatening ventricular arrhythmias and sudden cardiac death.In this regard,an accurate and comprehensive evaluation of the degree of RH parameters is of importance for assessment of heart state and arrhythmic risk.This review is devoted to comprehensive consideration of RH phenomena in terms of electrophysiological processes underlying RH,cardiac electric field formation during ventricular repolarization,as well as clinical significance of RH and its reflection on ECG parameters.The formation of transmural,apicobasal,left-toright and anterior-posterior gradients of action potential durations and end of repolarization times resulting from the heterogenous distribution of repolarizing ion currents and action potential morphology throughout the heart ventricles,and the different sensitivity of myocardial cells in different ventricular regions to the action of pharmacological agents,temperature,frequency of stimulation,etc.,are being discussed.The review is focused on the fact that RH has different aspects–temporal and spatial,global and local;ECG reflection of various RH aspects and their clinical significance are being discussed.Strategies for comprehensive assessment of ventricular RH using different ECG indices reflecting various RH aspects are presented.

摘要： A novel subspace projection anti-jamming algorithm based on spatial blind search is proposed,which uses multiple single-constrained subspace projection parallel filters.If the direction of arrival(DOA)of a satellite signal is unknown,the traditional subspace projection anti-jamming algorithm cannot form the correct beam pointing.To overcome the problem of the traditional subspace projection algorithm,multiple single-constrained subspace projection parallel filters are used.Every single-constrained anti-jamming subspace projection algorithm obtains the optimal weight vector by searching the DOA of the satellite signal and uses the output of cross correlation as a decision criterion.Test results show that the algorithm can suppress the jamming effectively,and generate high gain toward the desired signal.The research provides a new idea for the engineering implementation of a multi-beam anti-jamming algorithm based on subspace projection.

摘要： Nowadays,action recognition is widely applied in many fields.However,action is hard to define by single modality information.The difference between image recognition and action recognition is that action recognition needs more modality information to depict one action,such as the appearance,the motion and the dynamic information.Due to the state of action evolves with the change of time,motion information must be considered when representing an action.Most of current methods define an action by spatial information and motion information.There are two key elements of current action recognition methods:spatial information achieved by sampling sparsely on video frames’sequence and the motion content mostly represented by the optical flow which is calculated on consecutive video frames.However,the relevance between them in current methods is weak.Therefore,to strengthen the associativity,this paper presents a new architecture consisted of three streams to obtain multi-modality information.The advantages of our network are:(a)We propose a new sampling approach to sample evenly on the video sequence for acquiring the appearance information;(b)We utilize ResNet101 for gaining high-level and distinguished features;(c)We advance a three-stream architecture to capture temporal,spatial and dynamic information.Experimental results on UCF101 dataset illustrate that our method outperforms other previous methods.

摘要： 本发明公开了一种Oracle Spatial空间数据库的数字水印嵌入与提取方法。本发明利用空间数据库中要素的坐标排列顺序改变不会影响数据质量的特点，以坐标排列顺序的从小到大及从大到小两种不同状态来分别表示二进制水印信息“0”和“1”。该方法由于修改的只是坐标排列顺序而不是数据本身，从而不会对载体数据精度造成任何影响。并且本方法对于投影操作、几何变换以及数据压缩等诸多操作具有较好的鲁棒性。

摘要： 本发明公开了一种基于Spatial‑LargeFOV深度学习网络的车道线检测方法。该方法通过训练一个用于分割车道线像素区域的语义分割网络完成对车道线的定位。为了更有效地识别车道线这种长距离的连续性目标，探索了以LargeFOV为基础网络的编码器‑解码器结构，一方面利用空间卷积结构增强空间信息，另一方面利用不同扩张率的空洞卷积组合增加感受野，利用跳跃连接进行多级特征融合，达到融合多尺度上下文信息和细化分割边缘的目的。本发明在不同场景下均可以实现准确的车道线检测，具有良好的应用前景。

摘要： 一种基于Oracle Spatial空间数据生成符合IEC61970规范SVG/CIM图形模型文件的方法，通过Oracle Spatial空间数据特性，按照IEC61970的规范，对空间数据进行分析处理转换后，将空间数据通过SVG图形展现出来，图元间的逻辑、拓扑关系则由CIM模型展现，以满足与电网EMS系统图、模共享的目的；其整体流程为：由Oracle Spatial空间数据库，基于IEC61970标准，通过转换程序，将GIS专题图导出SVG图形、CIM模型，通过SVG图形、CIM模型文件作为中间数据模型，通过数据导入接口导入目标系统；其中SVG图形可以利用图形文件阅读器进行查询浏览。本发明的创新点在于，首次使用基于Oracle Spatial空间对象型数据，按照IEC61970的规范，实现了对象型空间数据到标记矢量型数据的转化。架设通了电网GIS电力EMS系统间数据交互共享的桥梁。

摘要： 本发明公开了一种Oracle Spatial空间数据库的数字水印嵌入与提取方法。本发明利用空间数据库中要素的坐标排列顺序改变不会影响数据质量的特点，以坐标排列顺序的从小到大及从大到小两种不同状态来分别表示二进制水印信息“0”和“1”。该方法由于修改的只是坐标排列顺序而不是数据本身，从而不会对载体数据精度造成任何影响。并且本方法对于投影操作、几何变换以及数据压缩等诸多操作具有较好的鲁棒性。