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Re-evaluating the geochronology of the Permian Tarim magmatic province: implications for temporal evolution of magmatism
期刊论文
JOURNAL OF THE GEOLOGICAL SOCIETY, 2016
Shangguan, Shimai
;
Peate, Ingrid Ukstins
;
Tian, Wei
;
Xu, Yigang
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提交时间:2017/12/03
LARGE IGNEOUS PROVINCE
U-PB GEOCHRONOLOGY
NW CHINA
MANTLE PLUME
TRACE-ELEMENT
FLOOD BASALTS
GEOCHEMICAL CHARACTERISTICS
DETECTING ALTERATION
NORTHWESTERN CHINA
UNDISTURBED ROCKS
Self-Assembled Templates of Aromatic Pentapeptides for Synthesis of CdS Quantum-Dots to Detect the Trace Amounts of Hg2+ in Aqueous Solutions
期刊论文
JOURNAL OF OLEO SCIENCE, 2016, 卷号: 65, 期号: 5, 页码: 431-439
作者:
Meng, Min
;
Dou, Yingying
;
Xu, Wenlong
;
Hao, Jingcheng
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提交时间:2019/12/16
self-assembly
templating synthesis
aromatic pentapeptides
CdS quantum
dots
trace detecting
Research on infrared dim-point target detection and tracking under sea-sky-line complex background (EI CONFERENCE)
会议论文
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications, May 24, 2011 - May 24, 2011, Beijing, China
Dong Y.-X.
;
Li Y.
;
Zhang H.-B.
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提交时间:2013/03/25
Target detection and tracking technology in infrared image is an important part of modern military defense system. Infrared dim-point targets detection and recognition under complex background is a difficulty and important strategic value and challenging research topic. The main objects that carrier-borne infrared vigilance system detected are sea-skimming aircrafts and missiles. Due to the characteristics of wide field of view of vigilance system
the target is usually under the sea clutter. Detection and recognition of the target will be taken great difficulties.There are some traditional point target detection algorithms
such as adaptive background prediction detecting method. When background has dispersion-decreasing structure
the traditional target detection algorithms would be more useful. But when the background has large gray gradient
such as sea-sky-line
sea waves etc.The bigger false-alarm rate will be taken in these local area.It could not obtain satisfactory results. Because dim-point target itself does not have obvious geometry or texture feature
in our opinion
from the perspective of mathematics
the detection of dim-point targets in image is about singular function analysis.And from the perspective image processing analysis
the judgment of isolated singularity in the image is key problem. The foregoing points for dim-point targets detection
its essence is a separation of target and background of different singularity characteristics.The image from infrared sensor usually accompanied by different kinds of noise. These external noises could be caused by the complicated background or from the sensor itself. The noise might affect target detection and tracking. Therefore
the purpose of the image preprocessing is to reduce the effects from noise
also to raise the SNR of image
and to increase the contrast of target and background. According to the low sea-skimming infrared flying small target characteristics
the median filter is used to eliminate noise
improve signal-to-noise ratio
then the multi-point multi-storey vertical Sobel algorithm will be used to detect the sea-sky-line
so that we can segment sea and sky in the image. Finally using centroid tracking method to capture and trace target. This method has been successfully used to trace target under the sea-sky complex background. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).
A facile and efficient method for rapid detection of trace nitroaromatics in aqueous solution
期刊论文
2010, 2010
Shengyang Tao
;
Yan Li
;
Guangtao Li
;
Cailan Yu
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