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跨海大桥系统受外界影响扰动,其变形伴有混沌现象发生.对桥梁变形监测数据实现了混沌识别,运用C-C法计算时间序列的延迟时间,用G-P方法求得最佳嵌入维数,通过求取的时间延迟和最佳嵌入维数对桥梁变形监测数据进行相空间重构,为混沌时间序列预测模型的建立奠定基础;基于RBF神经网络建立混沌时间序列预测模型,对实测数据进行桥梁变... 相似文献
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介绍了二郎山公路隧道轴线上3个钻孔的地应力测试结果,应用水压致裂法在钻孔中测试,所测的两个不同大小的水平主应力都大于垂直主应力(除了地表以下很浅处外),这个地应力与区域大地构造方向一致,在此基础上评价了隧道碉室围岩的稳定性。 相似文献
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Precise structural identification of phospholipids in the microalga Nitzschia closterium has been established using ultra performance liquid chromatography-electrospray ionization-quadrupole-time of flight-mass
spectrometry (UPLC-ESI-Q-TOF-MS) for direct analysis of total lipid extracts. Mass spectrometry was performed in reflective
time-of-flight using electron spraying ionization in negative mode. Phospholipid molecular species identification was based
on the characteristic product ions and neutral loss yielded by different phospholipids under ESI-MS/MS mode. The molecular
species were confirmed by the carboxylate anions produced by phospholipids in negative mode; the regiospecificity of the two
acyl chains was determined from the ratio of sn-1 to sn-2 carboxylate anion abundances. As a result, 18 lipid molecular species were identified for the first time in this microalga,
comprising seven phosphatidylcholines (PC), two phosphatidylethanolamines (PE), two phosphatidylinositols (PI), and seven
phosphatidylglycerols (PG). Lipid standards of PC, PE, PI, and PG were added to the total lipids as internal standards for
semiquantitative analysis, revealing concentrations of phospholipids in this species between 0.09 and 3.37 nmol/mg. This method
can produce a full structural profile of intact phospholipid molecular species and can be used for study of the physiological
and ecological functions of lipids by monitoring their individual changes over time. 相似文献
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底板突水的数值计算方法研究 总被引:1,自引:0,他引:1
应用数值计算方法,分析了采动对底板隔水层岩体上都和下部的影响与破坏,对底板突水机理提出了一些规律性的认识。 相似文献
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Yang Xiaoqian Wen Xin Zhou Chengxu Zhu Xiaojuan Meng Ran Luo Qijun Yan Xiaojun 《中国海洋湖沼学报》2018,36(5):1697-1706
Journal of Oceanology and Limnology - Typical harmful micro-algal species constantly occurred in high density in marine aquaculture ponds in Xiangshan and Sanmen Bay, Zhejiang Province. Fates of... 相似文献
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通过分析MapGIS制图软件的工作特点,在微软.NET框架下应用C#语言和MapGIS K9(以下简称K9)的二次开发接口,在数据字典技术的支持下,总结了一套MapGIS平台下标准图式按需定制及自动生成的技术流程,对各行业的标准化制图及提高制图人员的工作效率有较好的作用,同时对相关人员研究其它数字化制图软件下的标准出图提供了一定的参考价值. 相似文献
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Rapid, high-throughput and reliable methods are urgently required to accurately detect and monitor harmful algae, which are responsible for algal blooms, such as red and green tides. In this study, we successfully developed a multiplex PCR-based DNA microarray method capable of detecting nine harmful algal species simultaneously, namely Alexandrium tamarense, Gyrodinium instriatum, Heterosigma akashiwo, Karenia mikimotoi, Prorocentrum donghaiense, Prorocentrum minimum, Ulva compressa, Ulva ohnoi and Ulva prolifera. This method achieved a limit of detection (LOD) of 0.5 ng of genomic DNA (orders of magnitude of the deci-nanogram range) in the tested algae cultures. Altogether, 230 field samples from ship ballast waters and seaport waters were used to evaluate the DNA microarray. The clinical sensitivity and specificity of the DNA microarray assay in detecting field samples were 96.4% and 90.9%, respectively, relative to conventional morphological methods. This indicated that this high-throughput, automatic, and specific method is well suited for the detection of algae in water samples. 相似文献
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