谈调整构造

调整构造是伸展型沉积盆地和造山带中普遍存在的构造,它与走向构造一起,控制了沉积盆地或造山带的基本轮廓与内部结构。调整构造横切走向构造,并与之共同控盆、控岩、控矿,并间隔开两侧不同的构造样式。它以长时期、多阶段活动,具有高渗透性为主要特征,是控制矿带展布与矿床就位的重要构造,也是固定成矿预测区与找矿靶区的重要依据之一,本文以鲁西、中亚及乌拉山-大青山地区、兰坪─思茅盆地区及右江盆地区为例,论述了调整构造的基本特征及控矿作用。     

缢蛏糖原磷酸化酶基因多态性与糖原含量的关联分析

为探究缢蛏糖原磷酸化酶基因(Sc-GPH)与糖原含量的关系,本研究克隆获得Sc-GPH cDNA全长,检测其在不同组织、不同月份的表达模式,并在Sc-GPH基因编码区筛选与糖原含量关联的SNP位点.结果表明,Sc-GPH cDNA全长为3963 bp,开放阅读框为2541 bp,编码846个氨基酸;氨基酸序列多重比对和系统发育树显示,缢蛏与欧洲大扇贝、虾夷扇贝、长牡蛎等贝类亲缘关系较近,而与哺乳类、甲壳类、昆虫类亲缘关系较远.实时荧光定量PCR结果显示,Sc-GPH在8个组织中均有表达,其中在外套膜和足中表达量最高(p<0.01),推测与其糖原存储能力有关;不同月份的缢蛏外套膜和足中,Sc-GPH在8月表达量最高,而此时糖原含量较低,说明Sc-GPH的表达可能受缢蛏生殖周期的影响.以缢蛏"甬乐1号"群体为实验材料,在Sc-GPH基因编码区筛选到4个与糖原含量相关SNP位点,其中c.930T>C位点在台州野生群体中得到进一步验证,该位点为高糖原缢蛏分子标记辅助选育提供了候选标记.     

湘西保靖县塘口湾水库岩溶渗漏分析

库区可能渗漏的岩溶形态,特别是岩溶负向形态的观测、钻孔和跨孔电磁波透视及CT层析成像揭示,库区的岩溶渗漏途径有所不同。根据控岩断裂的分布、岩溶发育强度和渗漏途径的变化特征,归纳为3种岩溶渗漏类型(方式): 断裂裂隙间溶裂系统(缝)渗漏,多发生在页岩与碳酸盐岩界面附近;小型溶隙(缝)孔洞渗漏,集中在500m 高程段上下;洞穴复合系统渗漏,主要在510m 高程上下。库区岩溶渗漏严重性由下而上增强。      

基于Django框架的两种Web地震目录分页方法

在搭建基于Django框架的地震目录服务系统过程中,为实现地震目录的快速展示,介绍了在Web服务层和数据库服务层进行数据分页的方法,并实测了两者的Web响应速度。结果表明:当数据量较大时,在数据库服务层实现分页的效率更高。     

华南前汛期降水的年代际异常特征及其成因

利用1981—2013年中国160站逐月降水资料、NCEP/NCAR逐月再分析资料及NOAA海表温度资料,研究了华南前汛期降水年代际异常的时空特征及其可能成因。结果表明:1)华南前汛期降水在1992前后发生由异常偏少转为偏多的显著年代际转折,最显著异常中心位于广西东北部和广东北部。2)1990年代初发生的对流层高层南冷北暖(40°N附近为界)、对流层下暖上冷的年代际转折,使得高低层环流场均出现了有利于北方干、湿冷空气和孟加拉湾、西太平洋暖湿水汽在华南区域交汇并辐合上升的形势,造成华南前汛期降水发生偏少转偏多的显著年代际转折。年代际转折的前后两个时段中,位于热带的孟加拉湾槽、东亚沿岸EAP遥相关型波列中的西太平洋副高、阿拉斯加湾附近的脊,以及中纬度贝加尔湖以西以南脊的强度或位置均具有显著差异,故这些环流系统的年代际异常是华南前汛期降水年代际异常的重要原因。3)南太平洋关键区海温在1990年代初开始呈现增暖趋势,在偏暖(偏冷)时期,华南低空受异常气旋(异常反气旋)环流控制,对流层上层西风急流偏弱偏南(偏强偏北),造成华南地区降水异常偏多(偏少)。     

2017年春夏季西北太平洋浮游植物的区域差异及其与不同水团的关系

The West Pacific Ocean is considered as the provenance center of global marine life and has the highest species diversity of numerous marine taxa. The phytoplankton, as the primary producer at the base of the food chain,effects on climate change, fish resources as well as the entire ecosystem. However, there are few large-scale surveys covering several currents with different hydrographic characteristics. This study aimed to explore the relationships between the spatio-temporal variation in phytoplankton community structure and different water masses. A total of 630 water samples and 90 net samples of phytoplankton were collected at 45 stations in the Northwest Pacific Ocean(21.0°–42.0°N, 118.0°–156.0°E) during spring and summer 2017. A total of 281 phytoplankton taxa(5 μm) belonging to 61 genera were identified in the study area. The distribution pattern of the phytoplankton community differed significantly both spatially and temporally. The average abundances of phytoplankton in spring and summer were 797.07×10~2 cells/L and 84.94×10~2 cells/L, respectively. Whether in spring or summer, the maximum abundance always appeared in the northern transition region affected by the Oyashio Current, where nutrients were abundant and diatoms dominated the phytoplankton community;whereas the phytoplankton abundance was very low in the oligotrophic Kuroshio region, and the proportion of dinoflagellates in total abundance increased significantly. The horizontal distribution of phytoplankton abundance increased from low to high latitudes, which was consistent with the trend of nutrient distributions, but contrary to that of water temperature and salinity. In the northern area affected by the Oyashio Current, the phytoplankton abundance was mainly concentrated in the upper 30 m of water column, while the maximum abundance often occurred at depths of 50–75 m in the south-central area affected by the Kuroshio Current.Pearson correlation and redundancy analysis(RDA) showed that phytoplankton abundance was significant negatively correlated with temperature and salinity, but positively correlated with nutrient concentration. The phytoplankton community structure was mainly determined by nutrient availability, especially the N:P ratio.     

海气通量算法在海上蒸发波导诊断中的应用

利用TOGA COARE Bulk Air-Sea Flux Algorithm3.0,建立了基于通量算法的蒸发波导模型(Flux Evaporation duct Model),并进行了环境敏感性分析,而且与Paulus-Jeske模型对比,进行误差敏感性分析,并开展了雷达探测评估的海上试验,较全面的阐述了基于通量算法的蒸发波导模型的性能。     

Soil amplification based on seismometer array and microtremor observations in Chiba,Japan

Soil amplification characteristics of earthquake ground motion were investigated in terms of peak ground acceleration and transfer function based on the Chiba array observation records. The amplification of peak ground acceleration occurred mostly at the top soft layer and was similar for the three components. The effects of non-linear response of soil deposits on the transfer function were examined. Transfer functions calculated by ensemble average were close for the two horizontal components while those obtained from a smoothing operation were generally different. Both the transfer functions from the ensemble average and the smoothing operation underestimated the gain factor around the natural frequencies. A two-step smoothing procedure was proposed and a rotary spectrum was used to improve the estimation of the transfer function. Microtremors were observed at the locations of the boreholes where seismometers are buried. The power spectrum and spatial coherency of the microtremors were compared with those of the earthquake ground motion. Emphasis was placed on the wavetypes which dominated the peaks in the power spectra.     

Precision IR and visible solar photometry

A precision Solar Photometric Telescope (SPT) was constructed to study the large-scale thermal structure of the solar photosphere. This instrument does full-disk, broad-band (10 nm FWHM), two-color (500 and 650 nm) imaging of the solar photosphere. Data obtained by the SPT reveals network structures correlated with the supergranulation velocity field, and the CaK network of the chromosphere. Infrared array photometry extends these measurements to 1.6 and 2.2 micron. The observed correlation of the network brightness signal with the CaK network is positive at visible wavelengths. The correlation between the network at the opacity minimum (1.6 micron) and in the higher photosphere (2.2 micron) is positive also. The root-mean-square (r.m.s.) amplitude of the contrast at disk center is (2.34 ± 0.38) × 10^-3, (1.83 ± 0.51) × 10^-3, (1.02 ± 0.21) × 10^-3, and (1.11 ± 0.21) × 10^-3 for the green, red, H, and K band, respectively. It is consistent with a brightness temperature modulation of 2.9 K. The r.m.s. amplitude of the contrast of active region network shows a large increase toward the limb, and the quiet region network shows little center-to-limb variation (CLV). Power-spectrum analysis shows that the bright facular points in the active regions appear in the form of enhanced network.     

海底地震仪自噪声分析

海底地震仪是海上观测天然地震的主要手段,仪器所记录到的噪声分为环境噪声和仪器噪声。本文利用2018年9月3日—2019年7月1日期间浯屿岛海底地震观测台所采集到的数据,对海洋环境下的强震型海底地震采集站和宽频带海底地震采集站进行仪器自噪声分析,利用两道互相关模型,采用加窗平均周期图法计算功率谱,通过1/3倍频程积分作平滑处理,得到仪器自噪声功率谱密度图。对比分析相同型号仪器的自噪声功率谱,发现相同仪器的自噪声变化趋势一致,但自噪声大小有差异,且这种差异对于不同仪器、相同仪器的不同分量也存在不同。