Phylogenetic analysis of cultivable bacteria isolated from Arctic sea-ice     

林学政  沈继红  黄晓航  高爱国 《极地研究(英文版)》2007,18(1):84-89

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.  相似文献   

Preliminary Study on the Water Drag of Schlegel's Black Rockfish Sebastes schlegeli     

LI Wentao  ZHANG Xiumei  GAO Tianxiang  JING Aiguo Fishery College  Ocean University of China  Qingdao  P.R.China 《中国海洋大学学报(英文版)》2004,3(1)

1　Introduction　FishcageculturesystemhasbeenwidelyusedinmaricultureindustryinChina .Indesigningthecagesystem ,thewaterdragactingonit,includingthatonculturedfish ,shouldbetakenintoaccount.Avarietyofmethodshavebeenusedtodeterminethewaterdragofanimalsrangin…  相似文献   

西秦岭北缘断裂带土壤气定点监测与初步结果分析          下载免费PDF全文

高曙德  赵洁  王爱国  张向红  曹玲玲  张昱  武善艺  苏小忠  杨超 《地震工程学报》2021,43(5):1001-1007

根据前人对西秦岭北缘断裂带上历史地震及古地震复发周期和离逝时间等的综合研究,得出该断裂存在发生强震的较大潜在风险,因此加强对该断裂现今构造活动的定点监测和地震预测预报具有重要现实意义。据此,根据断裂逸出气体测项剖面浓度分布（变化）特征,在西秦岭北缘断裂带（天水段）上新建3个断层土壤气连续观测站,开展断层气（H₂、CO₂、R_n、CH₄）浓度观测,分析断裂带不同段深部气体特征的空间差异及其随时间的变化特征,监测甘东南地区应力调整与地震活动。初步观测资料分析表明：在正常情况下其背景值比较稳定,且同一测项在不同测点变化形态具有相似性、同步性,说明观测资料真实可靠,并具有可比性。各测点出现测项同步异常变化时,可能反映了区域应力调整及变化状态,对震情跟踪和地震预测提供参考判据。  相似文献   

Abundance of general aerobic heterotrophic bacteria in the Bering Sea and Chukchi Sea and their adaptation to temperature   总被引：3，自引：0，他引：3  

陈皓文  高爱国  孙海青  矫玉田 《极地研究(英文版)》2004,15(1):39-46

1　IntroductionInthedeepseawithawatertemperaturelowerthan5℃andtheseabottom ,theor ganicmattersareoxidizedmainlybytheaerobicbacteria (BenderandHeggie 1 984;Her bert 1 986) ,whichmeansthattheaerobicbacteriainthisenvironmentareratherabun dant.Thearcticseaareaisanareawhereenvironmentispermanentlycold ,butsomere searchresults (Sahmetal.1 998)indicatethattherearedominantbacteria eubacteriainthearcticseawaterandsediment,andtheiradaptationtotemperaturehasnosubstantialdifferenceincomparisonwiththatof…  相似文献   

北京325 m气象塔塔体对测风影响的数值模拟   总被引：1，自引：0，他引：1  

程雪玲  胡非  曾庆存  李爱国 《气象科技》2014,42(4):545-549

安装在气象观测塔上的仪器进行风速测量时,气象塔塔体本身会对流场有一定的影响,使其附近局部流场发生变化,产生绕流和尾流,导致所测风场数据相对于真实风场值失真,利用计算流体力学软件Fluent对北京325m框架式气象塔周围的风场进行了模拟,给出流向风速在该塔伸臂上测风位置的失真情况,及风速失真大小随风向风速的变化规律,计算表明若伸臂处于迎风面,在测风点上的风速误差均小于5%,与实际观测一致,验证了北京325m气象塔风速伸臂设计的合理性。  相似文献   

Oceanic crustal structure and tectonic origin of the southern Kyushu-Palau Ridge in the Philippine Sea     

Xiongwei Niu  Pingchuan Tan  Weiwei Ding  Wei Wang  Yao Wei  Xiaodong Wei  Aiguo Ruan  Jie Zhang  Chunyang Wang  Yong Tang  Jiabiao Li 《海洋学报(英文版)》2022,41(1):39-49

A new high-resolution velocity model of the southern Kyushu-Palau Ridge(KPR) was derived from an activesource wide-angle seismic reflection/refraction profile. The result shows that the KPR crust can be divided into the upper crust with the P-wave velocity less than 6.1 m/s, and lower crust with P-wave velocity between 6.1 km/s and 7.2 km/s. The crustal thickness of the KPR reaches 12.0 km in the center, which gradually decreases to 5.0–6.0 km at sides. The velocity structure of the KPR is simil...  相似文献   

Effect of aluminate content in cement on the long-term sulfate resistance of cement stabilized sand     

Kaiwei Liu  Yueming Wang  Aiguo Wang  Daosheng Sun  Xingxing Chen 《Marine Georesources & Geotechnology》2020,38(7):844-853

Abstract

Durability of cement-based materials for marine/coastal structures is an increasingly challenging problem. Sulfate ions in seawater can react with aluminate in cement to form erosion products, causing cracks and spalling. When cement is used to stabilize loose erodible sand in coastal areas, the resistance to sulfate attack is questionable. In this study, four cements with different aluminate contents were used to stabilize sand. Cement stabilized sands were immersed in 5% Na₂SO₄ solution for 300-days to simulate long-term sulfate attack process. The deterioration of engineering performance was evaluated based on expansion ratio, mass change, uniaxial compressive strength, and ultrasonic velocity. The deterioration mechanisms were analyzed through mineralogical and microstructural observations including X-ray diffraction, EDS, scanning electronic microscopy, and nuclear magnetic resonance. The results showed that the development of macro-scale mechanical performances could be divided into two stages (initial stage and erosion stage) when subjected to 300-days immersion in 5% Na₂SO₄ solution. Sand stabilized by low-aluminate-content cement displayed better engineering performance especially at the erosion stage. Mechanistically, more ettringite was formed in high-aluminate-content cement stabilized sand, leading to swelling and cracking. The formation of ettringite and gypsum were accompanied with the consumption of portlandite, leading to further strength loss.  相似文献   

新疆伽师地区非弹性衰减、场地响应与震源参数研究   总被引：3，自引：1，他引：2  

李志海  朱成英  夏爱国  冯磊  唐兰兰 《中国地震》2010,26(3)

本文用伽师地区11个数字地震台记录的地震波形资料,用Atkinson方法反演该地区地震波的非弹性衰减;用Moya方法反演11个台的场地响应。扣除地震记录中的传播路径、场地响应与仪器响应后,用遗传算法测定参与计算的76次地震震源参数。分析结果表明:伽师地区Q0值小于天山中东段地区Q0值,这表明该地区构造运动要比天山中东段剧烈,地震活动反映的情况也是如此;11个台的台基都有不同程度的放大效应。在单对数坐标下,76次地震震级与地震矩、震源尺度成正相关关系,与拐角频率成反相关关系。地震震级与应力降之间没有明显依赖关系,表明该地区地震应力降值可作为一个参数为地震预测服务。  相似文献   

北京"12·7"降雪过程的分析研究   总被引：35，自引：7，他引：28  

赵思雄  孙建华  陈红  齐琳琳  赵翼浚  李爱国  李云云 《气候与环境研究》2002,7(1):7-21

对2001年12月7日一次引发北京交通堵塞的降雪过程的成因进行了分析.通过对各种资料,包括北京325 m气象塔获取的特殊观测资料的分析,认为这次降雪过程属于较为常见的"回流天气"型.但由于该系统的信息较弱,给预报增加了难度.对于改进预报的可能性作了一些探讨,并对一些相关问题提出了看法.  相似文献   

Spatial dependence of diurnal temperature range trends on precipitation from 1950 to 2004   总被引：2，自引：0，他引：2  

Liming Zhou  Aiguo Dai  Yongjiu Dai  Russell S. Vose  Cheng-Zhi Zou  Yuhong Tian  Haishan Chen 《Climate Dynamics》2009,32(2-3):429-440

This paper analyzes the spatial dependence of annual diurnal temperature range (DTR) trends from 1950–2004 on the annual climatology of three variables: precipitation, cloud cover, and leaf area index (LAI), by classifying the global land into various climatic regions based on the climatological annual precipitation. The regional average trends for annual minimum temperature (T _min) and DTR exhibit significant spatial correlations with the climatological values of these three variables, while such correlation for annual maximum temperature (T _max) is very weak. In general, the magnitude of the downward trend of DTR and the warming trend of T _min decreases with increasing precipitation amount, cloud cover, and LAI, i.e., with stronger DTR decreasing trends over drier regions. Such spatial dependence of T _min and DTR trends on the climatological precipitation possibly reflects large-scale effects of increased global greenhouse gases and aerosols (and associated changes in cloudiness, soil moisture, and water vapor) during the later half of the twentieth century.  相似文献