一种新的固体潮观测数据特征量提取方法

将经验模态分解方法应用于固体潮观测数据的处理,通过对模态分量从频域上以及从固体潮调和分析结果上与原始观测数据进行对比证明：经验模态分解可以将固体潮观测数据完整地分离成5种特征量：潮汐观测高频信号、半日波信号、周日波信号、潮汐观测低频信号和观测数据的长趋势变化。     

2023年土耳其7.8级强震前烟台台伸缩仪EW分量固体潮畸变北大核心CSCD

烟台台SS-Y伸缩仪EW分量在2023-02-06土耳其7.8级双震前2 d开始出现急速上升趋势变化,至6日凌晨开始下降,变化幅度达到9.58×10^(-8),震后维持快速上升趋势。对烟台台伸缩仪稳定性指标进行判定,认为仪器稳定;经现场核实,未发现环境干扰。最后对烟台台伸缩仪固体潮畸变特征进行分析,并基于畸变与远震前兆的关系进行初步探讨。     

2023年土耳其7.8级强震前烟台台伸缩仪EW分量固体潮畸变

烟台台SS-Y伸缩仪EW分量在2023-02-06土耳其7.8级双震前2 d开始出现急速上升趋势变化,至6日凌晨开始下降,变化幅度达到9.58×10^-8,震后维持快速上升趋势。对烟台台伸缩仪稳定性指标进行判定,认为仪器稳定;经现场核实,未发现环境干扰。最后对烟台台伸缩仪固体潮畸变特征进行分析,并基于畸变与远震前兆的关系进行初步探讨。     

大气降水对数字化地倾斜观测干扰特征分析

对武汉基准地震台倾斜固体潮观测资料的研究表明,固体潮曲线畸变是降雨渗透使基岩膨胀的结果。降雨对记录曲线的影响主要表现在:1)时间上具有同步效应。降雨发生后倾斜仪的NS分量发生南倾,EW分量发生东倾;2)量级上受降雨干扰严重的主要为NS分量,EW分量受干扰程度较轻;3)垂直摆受降雨的干扰程度比水管仪的大。     

不同插值方法对典型固体潮水位插值结果比较

选取9口固体潮观测井的3种典型水位数据,用5种插值方法进行插值分析。结果表明,三次多项式插值法对少量数据缺失的插值效果最佳;线性插值法对趋势变化大、固体潮汐波动被压制水位的插值效果最好;ARMA模型预测法对固体潮显著、趋势变化平缓水位的插值效果最佳;线性插值和ARMA模型预测法对固体潮清晰、短期起伏波动水位的插值效果各有其优势。     

庐江台自流井流量固体潮观测资料调和分析的初步结果

本文给出了积分采样数据的维尼迪柯夫调和分析方法。使用该方法,以相应的固体潮体应变为理论值,对庐江台自流井流量1987年7月～1988年1月的观测数据(脉冲数)进行了调和分析计算,主要潮波结果为:振幅因子(脉冲数/10~(-9))O_1波:49.6±0.6;M_2波:50.8±0.3;其相位滞后分别为-4°.6±0°.7、6°.9±0°.3。说明以该井流量做为体应变仪具有很高的灵敏度。     

计算固体潮潮汐参数的非数字滤波调和分析方法

介绍了计算固体潮潮汐参数（潮汐因子和相位滞后）的非数字滤波调和分析方法的原理、计算公式和程序。选用中纬度点两年重力固体潮理论值和兰州水管倾斜仪ＥＷ分量１９８７～１９９７年期间的观测数据作试验计算,将其计算结果与维尼迪柯夫调和分析方法计算结果进行了对比。结果表明,非数字滤波调和分析方法所得周日频段内主要波群的潮汐参数与维尼迪柯夫调和分析计算结果无明显差别,且非数字滤波调和分析方法还有利于用时值直接研究固体潮观测结果中的长周期波信息和求解非潮汐变化的特征因子。     

井水固体潮的调和分析方法及京14井调和分析结果

本文系统地论述了井水水位固体潮的调和分析方法,介绍了自动排除水位记录中短期扰动影响的预处理方法。对京14井水位观测资料进行分析后,获得了包括长周期波M_1在内的各类波的调和分析结果。其结果令人满意,表明调和分析和预处理方法可行,也说明京14井的井孔-含水层系统的封闭性和抗干扰性好,具有较强的记录井水固体潮的能力。     

固体潮观测数据的滤波预处理方法

本文提出了一种固体潮观测数据的预处理方法，组成了三组长度分别为４８小时、４４小时和５小时的滤波器，它们能够有效他们除固体潮观测小的所有潮汐和漂移成分，而只保留包括人为错误和环境干扰等引起的非规则畸变。利用它们对观测数据滤波后，根据统计原理可检测出错误数据和畸变。通过本文的工作，得到如下结论：（１）此方法计算简单，通用性强；（２）滤波值满足正态分布，（３）４８小时滤波器可实时计算作为资料判断标准的单位权方差且可估计资料段质量；（４）５小时滤波器对固体潮观测中几种典型的突跳方式（连续型、隔点型和孤立型）均有良好的检测和定位效果；（５）能检测出对调和分析结果有明显影响的含漂移畸变的资料段。     

关于在土层中进行钻孔应变观测的可行性问题

在土层中开展钻孔应变观测实验是地球动力学以及地震预报研究的需要.能否观测到固体潮对该实验的成功与否起决定作用.土层与岩层的主要区别是其疏松性.由此造成的压密永久变形问题,可以通过在适当深处以下安装探头来解决.同时,因为土在小变形动态载荷下呈现弹性,而固体潮应变变化量级为10-8左右,所以探头并不需要安装在太深的地方.理论分析的结果是,虽然钻孔应变仪在土层中观测应变变化的灵敏度小于岩层,但是因为在相同的应力下,土层弹性变形比岩层大得多,所以在整体效果上是有利于在土层中观测到固体潮的.孔隙水的变化会给钻孔应变观测带来严重干扰,钻孔应变探头的深度应该避开地下水位变动范围.如何能在土层中观测到固体潮,最终需要通过实验来说明.     

Preliminary study on plasma membrane fluidity of Psychrophilic Yeast Rhodotorula sp.NJ298 in low temperature

The ability of cell to modulate the fluidity of plasma membrane was crucial to the survival of microorganism at low temperature. Plasma membrane proteins, fatty acids and carotenoids profiles of Antarctic psychrophilc yeast Rhodotorula sp. NJ298 were investigated at -3 ℃, 0 ℃ and 8 ℃. The results showed that plasma membrane protein content was greater at -3 ℃ than that at 8 ℃, and a unique membrane polypeptide composition with an apparent molecular mass of 94.7 kDa was newly synthesized with SDS-PAGE analysis; GC analysis showed that the main changes of fatty acids were the percentage of unsaturated fatty acids (C18∶ 1 and C18∶ 2) and shorter chain saturated fatty acid (C10∶ 0) increased along with the decrease of the culture temperature from 8 ℃ to -3 ℃; HPLC analysis indicated that astaxanthin was the major functional carotenoids of the plasma membrane, percentage of which increased from 54.6±1.5% at 8 ℃ to 81.9±2.1% at -3 ℃. However the fluidity of plasma membrane which was determined by measuring fluorescence anisotropy was similar at -3 ℃, 0 ℃ and 8 ℃. Hence these changes in plasma membrane's characteristics were involved in the cellular cold-adaptation by which NJ298 could maintain normal plasma membrane fluidity at near-freezing temperature.     

Information for authors

正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprehensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose     

JOURNAL OF OCEAN UNIVERSITY OF CHINA

<正>Copyright Submfnion of a roanusatpt inks:that the work described has not been published before(exoept In the form of an abstrW or as part of a published lecture,review,or thesis);that it is not under consideration for publication elsewhere that its publication has been approved by ail     

Information for Authors

<正>The Journal of Ocean University of China(Oceanic and Coastal Sea Research)is a comprehensive academic quarterly sponsored by the Ocean University of China,published one volume per year.This journal is devoted to the publication of the theoretical and applied research results on oceanography and marine fisheries.The fieldcovered include the physical,chemical,biological,geo-     

Hydraulics and Hydrology in Mountain Areas

<正>The 35th IAHR World Congress was held in Chengdu,China from September 8 to September 132013.The title of the conference was:"The Wise Finds Pleasure in Water:Meandering through Water Science and Engineering".During the congress,1239 papers were presented in 139sessions for oral presentations and 7 sessions for poster presentations.After the Congress,a Committee was appointed to select some of the best papers presented at the Congress for publication,after a     

Sea ice thickness measurement in spring season in Bothnian Bay using an electromagnetic induction instrument

As an important component of the cryosphere,sea ice is very sensitive to the climate change.The study of the sea ice physics needs accurate sea ice thickness.This paper presents an electromagnetic-induction(EM) technique which can be used to measure the sea ice thickness distribution efficiently,and the successful application in Bothnian Bay.Based on the electromagnetic field theory and the electrical properties of sea ice and seawater,EM technique can detect the distance between the instrument and the ice/water interface accurately,than the sea ice thickness is obtained.Contrastive analysis of the apparent conductivity data obtained by EM and the value of drill-hole at same positions allows a construction of a transformable formula of the apparent conductivity to sea ice thickness.The verification of the sea ice thickness calculated by this formula indicates that EM technique is able to get reliable sea ice thickness with average relative error of only 12%.The statistic of all ice thickness profiles shows that the level ice distribution in Bothnian Bay was 0.4-0.6 m.     

Thermohaline structure inhomogeneity associated with polynia at the northern margin of Emery Ice-shelf

Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area.     

Phylogenetic analysis of cultivable bacteria isolated from Arctic sea-ice

Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter.     

Information for authors

正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprchensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose is to publish achievements in fundamental research,applied