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Characteristics of land use conversion in soda saline-alkali soil region of central Northeast China

Global Geology 2022年第2期25卷 116-125页

作者： ZHANG Haobin yang changbao GUO Huali HOU Guanglei College of Geo-Exploration Science and Technology Jilin UniversityChangchun 130026China Northeast Institute of Geography and Agroecology Chinese Academy of SciencesChangchun 130102China Shaanxi Satellite Application Center for Ministry of Natural Resources of the PRC Xi'an 710054China

Since the 1970s,the soda saline-alkali soil region,which is located in the semiarid-arid region of the central Northeast China,has experienced drastic climate ***,human activities and socio-economic development have led to an increase in water *** factors have brought out considerable land use change and a lot of soil *** land use types were obtained from remote sensing images interpretation based on Landsat MSS in 1970s,TM,ETM in 1990s and *** characteristics of land use conversion and its response to climate change and influence of human activities were explored in the study area during *** results include:(1)The land use types had changed significantly,especially farmland and grassland,with annual growth rates of 0.31% and 0.35%,*** terms of the saline-alkali land,the area increased greatly during 1970-1990,and its increase was mainly from *** was a decrease from 1990 to 2010,and the loss of saline-alkali was replaced by farmland and grassland.(2)Climate change in the study area is obvious,showing a trend of decreasing precipitation and increasing *** change of saline-alkali land area is closely related to the precipitation,with R2=0.78,passed a passing the 0.01 significance test.(3)The correlation of land use degree index and human activity index with saline-alkali land was not obvious,and the changes in these indices only reflected the land use *** sufficient rainfall,the saline-alkali land was developed into farmland by humans,which caused the decrease of the saline-alkali ***,climate change is the main driving force of land salinization in the study area.

关键词： land use change soda saline-alkali soil region climate change land use degree index

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Evolution characteristics of hydrological connectivity pattern of marsh wetland in Naoli River Basin

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Global Geology 2021年第2期24卷 95-102页

作者： WANG Haonan HOU Guanglei yang changbao SONG Xiaolin College of Geo-Exploration Science and Technology Jilin UniversityChangchun 130026China Northeast Institute of Geography and Agricultural Ecology Chinese Academy of SciencesChangchun 130102China

As an important indicator of the structural and functional stability of wetland landscapes,hydrological connectivity plays an important role in maintaining the stability of wetland ***-scale human activities have led to significant changes in the hydrological connectivity pattern of wetlands in Naoli River Basin since 1950 *** with the availability of wetland habitat and the spreading capacity of aquatic birds,hydrological connectivity indices of marsh wetlands were calculated in the studied area,and the temporal and spatial changes were analyzed from 1950 s to *** results indicate that:(1)the hydrological connectivity index of the marsh wetlands shows a growth trend with increasing distance *** patches of marsh wetlands linked together when the distance threshold reached 35--40 km;(2)the optimal distance of hydrological connectivity is about 10 km for marsh wetlands of whole Naoli River Basin;(3)the total hydrological connectivity of marsh wetlands decreased in the Naoli River Basin from 1950 s to *** the hydrological connectivity index increased after 2005,the fragmentation of the landscape has not been *** analysis of the wetland hydrological connectivity can provide a scientific basis for the ecological restoration and protection of the wetland in the Naoli River Basin.

关键词： Naoli River Basin hydrological connectivity pattern evolution distance threshold

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Comparative analysis of fracture identification methods based on gravity anomaly in Heilongjiang

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Global Geology 2015年第2期18卷 134-139页

作者： CHANG Chang yang changbao WU yangang CHEN Jingyi College of Geo-Exploration Science and Technology Jilin University College of Engineering and Natural Sciences University of Tulsa

The identification of fractures is of great importance in gravity and magnetic data processing and *** this study,four fracture identification methods are applied,and widely used in processing and analysis of the gravity anomaly,including vertical second derivative method,tilt derivative method,theta map method and normalized differential method,for gravity data acquired in a given area in *** comparing the distribution of the zero contour or maximum contour,we summarize the application effects,and both advantages and disadvantages of each *** is found that tilt derivative method and normalized differential method provide better effects than other two methods:the narrower anomaly gradient belt and higher identification precision of fracture or geological *** inferred fractures and geological boundaries have a great match with the results obtained from geologic map and remote sensing data *** study results have definitely provided the theoretical foundation for identifying faults and the geological boundaries.

关键词： gravity anomaly fracture identification Heilongjiang

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Several boundary identification methods of gravity data and application in Vientiane of Laos area

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Global Geology 2014年第1期17卷 55-61页

作者： LI Lin WU yangang yang changbao HUAN Hengfei GUO Cancan College of Geo-exploration Science and Technology Jilin University Shenyang Center of China Geological Survey School of Geophysics and Information Technology China University of Geosciences

The authors studied the potential field boundary identification of the new technology in order to find out the possible fractures or contact zones using the following methods such as tilt derivative,horizontal derivative of tilt derivative,normalized standard deviation and normalized differential method. Combined with Euler deconvolution and small subdomain filtering,the actual data processing results show that these methods are all able to identify wider range extending fractures and obtain abundant geological information. The horizontal derivative of tilt derivative and normalized differential method have a better resolution for the small cutting fractures and lacunae in the studied area. They provide a reliable basis for study of the cutting relationship between fractures.

关键词： potential field boundary identification fracture detect Vientiane Laos

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Application of several potential field separation methods of gravity data in Vientiane of Laos area

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Global Geology 2017年第2期20卷 89-97,105页

作者： LI Zhaohui ZHAO Qiang WU yangang yang changbao ZHAO Guoxing XING Congcong College of Geo-Exploration Science and Technology Jilin UniversityChangchun 130026China 519 Team of North China Geological Exploration Bureau Baoding 071051HebeiChina

Gravity data observed in geophysical surveys are the sum of potential field produced by all underground inhomogeneous geological sources with different scales,different patterns and different depths. The aim of gravity exploration is mainly to extract the meaningful local anomaly from the regional gravity anomaly which is helpful to detect the deep structure and delineate the favorable area for mineral prospecting. In this paper,several anomaly separation methods are theoretically discussed,including trend analysis method,finite element method,interpolating cut method and analytic continuation method. And,these methods are applied to achieve the delineation of potash-mine deposit in Vientiane. Through experiments,analysis and comparison,the separating result of upward continuation is shown to be satisfactory,for that can separate the ore body anomaly from the background field more effectively. Further,with the combination of the geological information and gravity anomaly,it infers four rich potash zones in the study area of Vientiane which is significant for future geological work.

关键词： gravity anomaly anomaly separation potash mine Vientiane area

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Research on the deformation mechanism of flexural toppling deep-seated landslides based on large centrifuge physical model testing: A case study of the Genie landslide in the Tibetan Plateau

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Journal of Earth Science 2025年

作者： Shichao Cao Xiujun Dong changbao Guo Ruian Wu Zhihua yang Guang Zheng Xiaoqiang Zhu State Key Laboratory of Geohazard Prevention and Geoenvironment Protection， Chengdu University of Technology Institute of Geomechanics， Chinese Academy of Geological Sciences Key Laboratory of Active Tectonics and Geological Safety， Ministry of Natural Resources

Flexural toppling is a widespread failure mode in natural and excavated anti-inclined rock slopes of the eastern Tibetan Plateau， which can further evolve into large deep-seated landslides， posing significant threats to the construction and operation of important infrastructure. In this study， we took the large deep-seated Genie landslide as a case study and established a centrifuge physical model to analyze the deformation mechanism and evolutionary process of flexural toppling deep-seated landslides under the effect of gravity. The results indicate that the geomechanical mode of landslide instability is characterized by flexural toppling-shearing-sliding， with the deformation process could be divided into three stages: initial slow deformation stage marked by crack generation， rapid deformation stage characterized by the expansion and fracturing of cracks， and a low-speed deformation stage characterized by creep. Notably， the sliding surfaces do not adhere strictly to predefined bending zones but develop cracks along the bending parts， which gradually expand and penetrate deeper， eventually forming multiple potential sliding surfaces. The analysis of the entire process deformation evolution of flexural toppling deep-seated landslides suggests that the rapid deformation stage is the optimal time to take action for landslide prevention and control. The study demonstrates that the shear strength also plays a key factor in the evolution of flexural toppling. The research reveals the deformation mechanism and evolutionary process of large deep-seated landslides in deep-cut canyon areas， providing valuable reference for the prediction， assessment， and prevention of such slopes and landslides.

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小波包分析在Hyperion数据提取农田土壤有机质含量中的应用研究

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应用基础与工程科学学报 2017年第5期25卷 869-879页

作者：杨长保李东辉刘津怿吴梦红吉林大学地球探测科学与技术学院吉林长春130026 国家测绘地理信息局第二航测遥感院黑龙江哈尔滨150086

基于星载高光谱遥感影像Hyperion数据,运用连续统去除,小波包分析等技术,探索土壤有机质含量遥感定量提取的新方法.作者对采样点的反射率光谱曲线进行连续统去除、小波包分析处理、连续统去除后的光谱再进行小波包分析,研究了土壤有机... 详细信息

基于星载高光谱遥感影像Hyperion数据,运用连续统去除,小波包分析等技术,探索土壤有机质含量遥感定量提取的新方法.作者对采样点的反射率光谱曲线进行连续统去除、小波包分析处理、连续统去除后的光谱再进行小波包分析,研究了土壤有机质含量与反射率光谱及其变换形式的相关性系数,并建立了13个多元线性回归模型,经分析认为连续统去除后的光谱比原始光谱建立的模型效果好,而小波分析处理的光谱建立的模型的预测能力和精度均比未进行小波分析光谱的反演模型高,其中高频信号的效果要优于低频信号的效果.从研究结果可以看出把小波包分析方法引入到地物特征波谱的增强处理中对于提高定量遥感反演的精度具有良好的效果.

关键词：小波包分析连续统去除 Hyperion 相关性系数多元线性回归

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直流稳压电源及漏电保护装置设计

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实验技术与管理 2015年第7期32卷 99-103页

作者：寸彦萍杨长保云南开放大学机电工程学院云南昆明650223 吉林大学地球探测科学与技术学院吉林长春130026

提供一种线性直流稳压电源及漏电保护装置的设计方法,以芯片LM2577、LM2576和单片机为核心制作DC—DC转换器,提供额定输出电压为5V±0.05V、额定输出电流为1A的直流稳压电源。可以实现直流电压输入5.5-25V,输出电压保持在5V±0.05V,电... 详细信息

提供一种线性直流稳压电源及漏电保护装置的设计方法,以芯片LM2577、LM2576和单片机为核心制作DC—DC转换器,提供额定输出电压为5V±0.05V、额定输出电流为1A的直流稳压电源。可以实现直流电压输入5.5-25V,输出电压保持在5V±0.05V,电压调整率SU≤1%;当输入电压为7V,直流稳压电源输出电流由1A减小到0.01A,负载调整率SL≤1%,并能够实现功率测量与实时显示,能够实现对模拟漏电支路的漏电保护动作。

关键词：直流稳压电源 DC—DC转换器漏电保护 LM2576/7 单片机

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边支血管主动球囊保护技术在冠状动脉分叉病变介入治疗中的应用分析

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临床放射学杂志 2016年第5期35卷 778-781页

作者：杨长宝郑海军河南省焦作市人民医院心血管内科 454150

目的对比Jailed导丝技术与边支血管主动球囊保护技术在冠状动脉分叉病变介入治疗中的临床效果。方法选取2014年1月至2015年3月期间166例冠状动脉分叉病变行经皮冠状动脉介入(PCI)的患者,随机分为2组(Jailed导丝组82例,主动球囊保护组84... 详细信息

目的对比Jailed导丝技术与边支血管主动球囊保护技术在冠状动脉分叉病变介入治疗中的临床效果。方法选取2014年1月至2015年3月期间166例冠状动脉分叉病变行经皮冠状动脉介入(PCI)的患者,随机分为2组(Jailed导丝组82例,主动球囊保护组84例),比较两组患者的对比剂用量、手术时间、PCI术后即刻影像学效果及30天主要不良心血管事件(MACE)发生率等方面差异。结果主动球囊保护组较Jailed导丝组患者术后的TIMI 3级血流率(96%vs 85%,P0.05]、手术时间[(34.12±8.94)min vs(31.63±8.81)min,P>0.05]无明显增加。结论采用边支血管主动球囊保护技术提高了分叉病变PCI的临床效果,而且不增加手术时间及对比剂用量。

关键词：主动球囊保护技术分叉病变介入治疗

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玻利维亚优势矿种成矿带划分和基于遥感地质解译的找矿预测

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地质通报 2017年第12期36卷 2322-2331页

作者：贾大成穆宏玉姜琦刚李远华杨长保吉林大学地球探测科学与技术学院吉林长春130061

钨、锡和锑是玻利维亚的优势矿种。基于ETM遥感影像和遥感地质解译方法对玻利维亚安第斯山脉优势矿种分布特征进行解译,从遥感地质角度圈定玻利维亚优势矿种和科迪勒拉成矿带,并进一步分为科迪勒拉奥连塔尔(Cordillera Oriental)和科迪... 详细信息

钨、锡和锑是玻利维亚的优势矿种。基于ETM遥感影像和遥感地质解译方法对玻利维亚安第斯山脉优势矿种分布特征进行解译,从遥感地质角度圈定玻利维亚优势矿种和科迪勒拉成矿带,并进一步分为科迪勒拉奥连塔尔(Cordillera Oriental)和科迪勒拉奥赛登塔尔(Cordillera Occidental)2个成矿亚带。成矿带在空间上具有东西分带,南北分区的特征;在时间上具有东带老、西带新,北段老、南段新的特征。依据成矿地质条件和成矿带时空分布特征进行遥感找矿预测,按不同比例尺由粗到细,逐步缩小找矿靶区,分层次划分找矿预测区。通过1∶100万遥感地质解译,提出战略选区;通过1∶25万遥感地质解译,提出重点找矿区;通过1∶5万遥感地质解译,提出找矿预测区。

关键词：优势矿种遥感地质解译成矿带找矿预测区玻利维亚

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