东营市破解土地制约发展瓶颈探析

土地作为开发建设的载体,在保证农产品供给,提供经济发展支撑,增加政府财政收入中不可替代。随着经济社会的快速发展,土地的"瓶颈"效应日益显现。东营市国土资源局通过外延扩展,内涵挖潜,提高土地利用效率等,探索了一条破解制约经济社会发展用地瓶颈的新路子。     

地震仪与地质雷达的数据存储格式及其读取

近年来,我国从国外引进了不少浅层地震仪和地质雷达设备,但厂家一般都不提供其数据文件存储格式。根据SEG公布的SEG-2数据存储格式,笔者对它进行了认真的探讨,并在Matlab语言环境下编制了相应的数据读取软件。实际应用结果表明,该程序的读取方法是正确的;且对于以SEG-2方式存储的任何类型的仪器设备数据,只需对读取字符串部分的语句稍加修改,就可满足其数据读取的需要。     

SIFT特征匹配在无人机低空遥感影像处理中的应用

无人机低空遥感成本低，方便快捷，但飞行姿态不确定，影像自动匹配程度低。本文将SIFT（Scak Invariant Feature Transform）特征应用于影像的自动相对定向，结合最小二乘法实现了影像的自动匹配。实验证明，该方法具有稳定、可靠、快速等特点，应用前景广阔。     

Underwater Target Detection Based on Reinforcement Learning and Ant Colony Optimization

Underwater optical imaging produces images with high resolution and abundant information and hence has outstanding advantages in short-distance underwater target detection.However,low-light and high-noise scenarios pose great challenges in un-derwater image and video analyses.To improve the accuracy and anti-noise performance of underwater target image edge detection,an underwater target edge detection method based on ant colony optimization and reinforcement learning is proposed in this paper.First,the reinforcement learning concept is integrated into artificial ants’movements,and a variable radius sensing strategy is pro-posed to calculate the transition probability of each pixel.These methods aim to avoid undetection and misdetection of some pixels in image edges.Second,a double-population ant colony strategy is proposed,where the search process takes into account global search and local search abilities.Experimental results show that the algorithm can effectively extract the contour information of underwater targets and keep the image texture well and also has ideal anti-interference performance.     

Upcoming International Events

Metals in lacustrine sediment have both anthropogenic and natural sources. Because of intensified human activities, the anthropogenic input of metal elements has exceeded the natural variability. How to distinguish the anthropogenic sources in lake sediments is one of the tasks in environmental management. The authors present a case study, which combined the geochemical and statistical methods to distinguish the anthropogenic sources from the natural background. A 56 cm core (core DJ-5) was collected from Dongjiu Lake, Taihu Lake catchment, China. The concentration distributions of Al, Ba, Be, Ca, Cd, Co, Cr, Cu, Fe, K, Li, Mg, Mn, Na, Ni, Pb, Sr, Ti, V and Zn in core DJ-5 indicated that Dongjiu Lake had serious Cd pollution, and the concentrations of Cr, Cu, Pb, Mn and Zn had also exceeded the Chinese State Standards of Soil Environmental Quality in the upper layer of the core. Using Al as a reference element, the other metals were normalized and compared with their baselines to calculate the enrichment factors (EFs). The principal component analysis (PCA) of metal concentrations was performed using ViSta6.4. The results of EFs and PCA indicated that the concentration variations of Cd, Cu, Pb, Mn and Zn were mainly caused by the anthropogenic sources, and the concentration variations of Cr and Ni were influenced by both the anthropogenic and natural factors, while the other metals were mainly derived from the natural sources. Intensified human activities within the lake catchment area resulted in the increase of heavy metal inputs directly and the acceleration of erosion which caused other metal elements to deposit in the aquatic environment. The results of this work will be useful in probing changes forced by humans in the lake environment and in adjusting human activity in restoring the lake environment.

定向井三向主应力模型及影响因素分析

定向井三向主应力受并眼轨迹、水平地应力方向等因素影响,求解困难,而目前多数井周主应力模型仅针对井壁位置,远离井壁多不适用.此文通过坐标转化方法,建立了定向井三向主应力的求解模型,并且对影响主应力大小的因素进行了研究,研究成果对于定向井井壁稳定、水力压裂等研究有一定的借鉴意义.     

ONSET数据流水线

随着天文大科学设备的投入使用,传统的开发模式面临程序重复开发,环境依赖冲突等问题。另外,集群是一个高度耦合的计算资源,严重的环境冲突可能导致整个集群不可用。为了解决这个问题,采用微服务的概念开发新的流水线框架,这种框架可以实现短期内开发和部署新的流水线。介绍了通过这种框架开发的ONSET数据流水线,为了实现准实时数据处理,采用MPI和GPU技术对核心程序做了优化,并对最后的性能做了评估。结果表明,这种开发模式可以在短期内搭建满足需求的流水线,这种开发模式对未来多波段多终端的天文数据处理有借鉴意义。     

Seismic liquefaction potential assessed by fuzzy comprehensive evaluation method

Liquefaction of loose, saturated granular soils during earthquakes poses a major hazard in many regions of the world. The determination of liquefaction potential of soils induced by earthquake is a major concern and an essential criterion in the design process of the civil engineering structures. A large number of factors that affect the occurrence of liquefaction during earthquake exist a form of uncertainty of non-statistical nature. Fuzzy systems are used to handle uncertainty from the data that cannot be handled by classical methods. It uses the fuzzy set to represent a suitable mathematical tool for modeling of imprecision and vagueness. The pattern classification of fuzzy classifiers provides a means to extract fuzzy rules for information mining that leads to comprehensible method for knowledge extraction from various information sources. Therefore, it is necessary to handle the soil liquefaction problem in a rational framework of fuzzy set theory. This study investigates the feasibility of using fuzzy comprehensive evaluation model for predicting soil liquefaction during earthquake. In the fuzzy comprehensive evaluation model of soil liquefaction, the following factors, such as earthquake intensity, standard penetration number, mean diameter and groundwater table, are selected as the evaluating indices. The results show that the method is a useful tool to assess the potential of soil liquefaction.     

强磁场对电磁发射弹药引信的危害及防护

研究了强磁场环境对弹药引信的危害,探讨了引信对强磁环境的防护方法,涉及到引信中活动零部件的设计及防护、引信中电路的强磁环境耐受性及防护2个方面.基于防护方法实用性的考虑,提出了采用位置布局与柔性导磁材料屏蔽相结合,对电磁发射弹药引信进行强磁场防护的方法,通过仿真和实验室试验,验证了提出的防护方法可为引信中的活动零部件、...