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日本血吸虫未成熟卵免疫血清抗卵胚反应的观察
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作者 李庆华 汪世平 +2 位作者 高冬梅 夏英定 徐绍锐 《热带病与寄生虫学》 2009年第3期125-126,146+188,共4页
目的研究日本血吸虫未成熟卵免疫血清在抗卵胚方面的作用。方法采用多途径免疫新西兰家兔的方法,制备日本血吸虫未成熟虫卵可溶性抗原的免疫兔血清,通过免疫酶染色定位观察免疫血清与未成熟卵胚的反应。结果证明未成熟卵免疫血清能特异... 目的研究日本血吸虫未成熟卵免疫血清在抗卵胚方面的作用。方法采用多途径免疫新西兰家兔的方法,制备日本血吸虫未成熟虫卵可溶性抗原的免疫兔血清,通过免疫酶染色定位观察免疫血清与未成熟卵胚的反应。结果证明未成熟卵免疫血清能特异地识别虫卵早期胚胎抗原,与未成熟虫卵卵胚出现较强的免疫反应。结论未成熟虫卵可溶性抗原免疫产生的抗卵胚作用与未成熟虫卵胚胎抗原所诱导的保护性免疫应答有关。 展开更多
关键词 日本血吸虫 未成熟卵 免疫血清 血清抗 免疫反应 SCHISTOSOMA Japonicum development 未成熟虫卵 可溶性抗原 胚胎抗原 免疫兔血清 异地识别 免疫应答 抗原免疫 方法 定位观察 新西兰 免疫酶 多途径 保护性
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Normalized edge detection, and the horizontal extent and depth of geophysical anomalies 被引量:2
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作者 李丽丽 韩立国 黄大年 《Applied Geophysics》 SCIE CSCD 2014年第2期149-157,252,253,共11页
Edge detection is an image processing technique for finding the boundaries of objects within images. It is typically used to interpret gravity and magnetic data, and find the horizontal boundaries of geological bodies... Edge detection is an image processing technique for finding the boundaries of objects within images. It is typically used to interpret gravity and magnetic data, and find the horizontal boundaries of geological bodies. Large deviations between model and true edges are common because of the interference of depth and errors in computing the derivatives; thus, edge detection methods cannot provide information about the depth of the source. To simultaneously obtain the horizontal extent and depth of geophysical anomalies, we use normalized edge detection filters, which normalize the edge detection function at different depths, and the maxima that correspond to the location of the source. The errors between model and actual edges are minimized as the depth of the source decreases and the normalized edge detection method recognizes the extent of the source based on the maxima, allowing for reliable model results. We demonstrate the applicability of the normalized edge detection filters in defining the horizontal extent and depth using synthetic and actual aeromagnetic data. 展开更多
关键词 geophysical anomalies normalized edge detection normalized total horizontal derivative regularization tilt angle theta map
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Theory and Method for Identifying Well Water Level Anomalies in a Groundwater Overdraft Area
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作者 Zhang Suxin Zhang Ziguang +1 位作者 Ren Xiaoxia Wang Xiang 《Earthquake Research in China》 2007年第4期428-436,共9页
The overexploitation of underground water leads to the continuous drawdown of groundwater levels, change of water quality and dry-up in dynamic water level observation wells. Due to land subsidence, the well pipes upl... The overexploitation of underground water leads to the continuous drawdown of groundwater levels, change of water quality and dry-up in dynamic water level observation wells. Due to land subsidence, the well pipes uplift and the observation piping systems are damaged. These environmental geology problems can present serious difficulties for the identification of earthquake anomalies by groundwater level observation. Basied on hydrogeological theories and methods, the paper analyzes the relations of the water balance state of aquifers with stress-strain conditions and the water level regime, and then discusses preliminarily the theory and method for identifying well water level anomalies in a groundwater overdraft area. The result shows that we can accurately judge the nature of the anomaly according to the diffusion character of the drawdown funnel in the well area in combination with the aforementioned theory and method and multi-year variation patterns obtained from existing data. The results of the research are helpful for distinguishing the influence of single centralized water pumping from the long-term overdraft of water on the water level, correctly recognizing water level anomalies in the groundwater overdraft area and increasing the level of earthquake analysis and prediction. 展开更多
关键词 Groundwater overdraft Water level observation Anomaly recognition
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Comparative analysis of fracture identification methods based on gravity anomaly in Heilongjiang 被引量:1
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作者 CHANG Chang YANG Changbao +1 位作者 WU Yangang CHEN Jingyi 《Global Geology》 2015年第2期134-139,共6页
The identification of fractures is of great importance in gravity and magnetic data processing and interpretation.In this study,four fracture identification methods are applied,and widely used in processing and analys... The identification of fractures is of great importance in gravity and magnetic data processing and interpretation.In 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 Heilongjiang.By comparing the distribution of the zero contour or maximum contour,we summarize the application effects,and both advantages and disadvantages of each method.It 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 boundary.The inferred fractures and geological boundaries have a great match with the results obtained from geologic map and remote sensing data interpretation.Those study results have definitely provided the theoretical foundation for identifying faults and the geological boundaries. 展开更多
关键词 gravity anomaly fracture identification Heilongjiang
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