我国最冷日期及其日均温分布特征的气候分析

采用五天滑动平均方法，对我国最冷日期及其日均温的分布特征进行了气候分析。最冷日期及其日均温有沿着纬向分布的特征。最冷日期除在西北地区、东北的北部边陲和滇南外，其余大部地区都出现在“三九”期间；最冷日平均气温自南向北迅速降低。     

The worldwide character of the 1969–1970 impulse of the secular acceleration rate

This paper continues earlier studies to ascertain whether the distribution of the 1969–1970 jump of the secular variation rate has a worldwide character. The geometry of the jump presents some similarities with the geometry of the secular variation itself. We give a new estimation of the westward drift rate and information about spatial and temporal variations of the secular variation field.     

用INGLADA与GEIGER方法实现近震精定位

介绍了一种近震定位方法，即利用INGLADA方法实现近震初定位，并对初定位结果利用GEIGER方法进行校正，最终取得精确定位结果的近震定位方法。通过使用虚拟台网测试此定位方法以及该定位方法在实际中的应用表明，将INGLADA与GEIGER方法相结合，在区域地震台网中是一种较理想的近震定位方法。作者已经在MATLAB下实现了此定位方法。     

SYSTEMATIC FORECAST ERROR IN U.S.NMC OPERATIONAL SPECTRAL MODEL

The distribution of monthly mean error of NMC model forecasts and its seasonal variation are investi-gated.The ratio of monthly mean error to standard deviation is used here to find out that the region where acorrection of systematic error is needed and appropriate is mainly in low latitudes.The improvement,afterthe model's vertical resolution and some physical parameters were changed from April 1985,is investigated,andthe NMC operational model forecasts have also compared with those of ECMWF.     

青藏高原腹地现代植物δ~(13)C空间分异反映的环境信息

对研究区植被碳同位素组成进行分析,该区高山嵩草样δ~(13)C值在-25.63‰～-27.95‰之间,平均值-26.63‰;高寒草原区混合样δ~(13)C值于-26.29‰～-27.73‰之间,平均-27.04‰。高山嵩草样总体呈现由南东往北西方向正偏趋势,与高原夏季风运移方向一致(r=0.44603,n=29,p<0.05);研究区北部高寒草原区混合植物样则更明显的指示了研究区由南向北干旱化的趋势(r=0.8112,n=5,p<0.1)。现代植物碳同位素组成是特定环境影响的结果,在研究区内的变化趋势,则被认为是主要受降水环境影响的结果。成规律展布的区域降水条件与地理位置耦合,建立高原腹地地表植物碳同位素组成与其地理位置的相关。同时通过对该区碳同位素组成的研究反映控制植被生长发育的环境信息。     

SOMATOM PLUS型CT故障分析及排除

环形伪影是ＣＴ设备中多见的伪影响之一,本文根据ＳＯＭＡＴＯＭＰＬＵＳＣＴ上环形伪影的直径,伪影的宽度伪影的位置和伪影出现的时间为依据,并结合ＰＬＵＳ机型ＤＡＳ系统部分的具体结构,判断故障所发生的部位和原因,并且验证了所作的判断,消除了故障。     

Future hydro-meteorological drought of the Johor River Basin,Malaysia, based on CORDEX-SEA projections

Water scarcity issues in the Johor River Basin (JRB) could affect the populations of Malaysia and Singapore. This study provides an overview of future hydro-meteorological droughts using climate projections from an ensemble of four Coordinated Regional Climate Downscaling Experiments – Southeast Asia (CORDEX-SEA) domain outputs under the Representative Concentration Pathway (RCP) 4.5 and 8.5 scenarios for the 2021–2050 and 2071–2100 periods. The climate projections were bias corrected using the quantile mapping approach before being incorporated into the Soil and Water Assessment Tool (SWAT) hydrological model. The Standardized Precipitation Index (SPI) and Standardized Streamflow Index (SSI) were used to examine the meteorological and hydrological droughts, respectively. Overall, future annual precipitation, streamflow, and maximum and minimum temperatures are projected to change by about ?44.2 to 24.3%, ?88.7 to 42.2%, 0.8 to 3.7ºC and 0.7 to 4.7ºC, respectively. The results show that the JRB is likely to receive more frequent meteorological droughts in the future.     

平潭岛东北部近岸海域大型污损生物群落结构特征

于2017年6月至2018年5月在平潭岛东北部近岸海域开展污损生物生态研究,探讨了该海域大型污损生物的群落结构特点及演替趋势。周年模拟挂板试验结果显示,该海域大型污损生物隶属13门92种,以广分布暖水种为主,其中主要优势种为营固着生活的网纹藤壶(Amphibalanus reticulatus)、大室别藻苔虫(Biflustra grandicella)、三角藤壶(Balanus trigonus)和中胚花筒螅(Ectopleura crocea),以及自由生活的廉形叶钩虾(Jassa falcata)和齿掌细身钩虾(Maeropsis serratipalma)等。虽然该海域全年均有生物附着,但附着强度的季节性差异显著,附着盛期为6月至8月(生物量介于7 326.0～12 970.0 g/m2之间,以湿质量计),12月至次年2月(生物量介于39.5～1 580.5 g/m2之间)为附着淡季,而且污损生物摄食类型以悬浮物食者为主。温度和盐度是影响污损生物附着和分布的主要环境因素,水体透明度、水动力条件、地表径流和养殖等人类活动对污损生物的分布也有重要影响。     

东南极普里兹湾陆架区大型底栖动物群落结构

To explore the spatial pattern of macrobenthic communities and their response to environmental factors in the Prydz Bay,samples were collected using a 0.25-m2 box corer at 10 stations from November 2012 to April 2013.A total of 50 species of macrobenthos belonging to 8 phyla and 33 families were identified,of which polychaetes(e.g.,Maldane sarsi)and sponges(e.g.,Halichondria sp.and Leucosolenia sp.)were the most prominent groups.The macrobenthos in study area were categorized into five functional groups based on the feeding type,and the detritivorous group represented by polychaetes showed the highest average abundance,while the planktophagous group represented by sponges showed the highest average biomass.Macrobenthos abundance(0–592 ind./m2)and biomass(0–1155.5 g/m2)in the Prydz Bay were relatively lower than those of other Antarctic shelf soft-bottom waters,although the compositions of the dominant species and functional feeding groups were similar.The results of the Spearman rank correlation analysis indicated that the average biomass of the macrobenthos and the biomass of the planktophagous group in the study area were negatively correlated with the water depth,sediment grain size and silt percentage.However,these variables were clearly not strong determinants of macrobenthos assemblage structure.Many factors not measured in the study,e.g.,sediment organic matter and iceberg interference,have probably influenced the spatial distribution of macrobenthic community structure in the Prydz Bay.     

湖南省辰溪县石马湾区段找煤前景浅析

根据石马湾区段所处的区域构造位置,结合岩相古地理及聚煤规律的演化,运用成矿地质理论和方法,对区域内大面积出露的中侏罗统泸阳组地层下隐伏含煤岩系的含煤可能性进行了探讨,预测了区段内江口煤系资源预测量可达5 600万t,对下一步普查找煤工作具有一定的指导意义.