检索结果-南通市图书馆

Quantitatively distinguishing sediments from the Yangtze River and the Yellow River using δEu_N-ΣREEs plot

Science China Earth Sciences 2009年第2期52卷 232-241页

作者： JIANG FuQing ZHOU XiaoJing li AnChun li tiegang Key laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China Graduate University Chinese Academy of SciencesBeijing 100049China

Sediment samples were collected from the lower channel of the Yangtze River and the Yellow River and the contents of rare earth elements (REEs) were measured. In addition, some historical REEs data were collected from published literatures. Based on the δEuN-ΣREEs plot, a clear boundary was found be-tween the sediments from the two rivers. The boundary can be described as an orthogonal polynomial equation by ordinary linear regression with sediments from the Yangtze River located above the curve and sediments from the Yellow River located below the curve. To validate this method, the REEs con-tents of sediments collected from the estuaries of the Yangtze River and the Yellow River were meas-ured. In addition, the REEs data of sediment Core 255 from the Yangtze River and Core YA01 from the Yellow River were collected. Results show that the samples from the Yangtze River estuary and Core 255 almost are above the curve and most samples from the Yellow River estuary and Core YA01 are below the curve in the δEuN-ΣREEs plot. The plot and the regression equation can be used to distin-guish sediments from the Yangtze River and the Yellow River intuitively and quantitatively, and to trace the sediment provenance of the eastern seas of China. The difference between the sediments from two rivers in the δEuN-ΣREEs plot is caused by different mineral compositions and regional climate patterns of the source areas. The relationship between δEuN and ΣREEs is changed little during the transport from the source area to the river, and from river to the sea. Thus the original information on mineral compositions and climate of the source area was preserved.

关键词： sediment provenance Yangtze River Yellow River δEuN-ΣREEs plot

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Morphotype dependence of Globigerinoides ruber(white)and Trilobatus sacculifer Mg/Ca ratios in the western tropical Pacific:implications for reconstructing the mixed-layer depth

引用

Acta Oceanologica Sinica 2023年第11期42卷 35-43页

作者： Qi Jia tiegang li Zhifang Xiong Bingbin Qin First Institute of Oceanography Ministry of Natural ResourcesQingdao 266061China Laboratory for Marine Geology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266061China

Planktonic foraminifer Globigerinoides ruber(white)and Trilobatus sacculifer are the most frequently used mixedlayer dwelling species for reconstructing past oceanic ***,the Mg/Ca ratios of these two foraminiferal species have been used for reconstructing tropical/subtropical changes in sea surface temperature(SST).However,these two species have different morphotypes,of which the spatial and temporal differences in Mg/Ca ratios and their influencing factors are still *** objective is to investigate the potential differences between the Mg/Ca ratios of these different morphotypes of ***(white)and *** in the western Philippine Sea(WPS)and determine their implications for the reconstruction of SST and upper-ocean ***/Ca measurements are made on two basic morphotypes of ***(white)[sensu stricto(s.s.)and sensu lato(s.l.)]and ***[with(w)and without(w/o)a sac-like final chamber]on samples of Site MD06-3047B from the *** results reveal that Mg/Ca ratios of different *** morphotypes show consistent differences;and those of *** morphotypes show staged variations since MIS *** is suggested to select a single morphotype for reconstructing SST changes using the Mg/Ca ratios of *** and *** in the ***,the Mg/Ca ratios between *** *** *** s.l.[Δ(Mg/Ca)_(*** s.s.-s.l.)]downcore MD06-3047B covaries with indexes of summer *** with the core-top results,showing regional variation of differences in theΔ(Mg/Ca)_(*** s.s.-s.l.)over the western tropical Pacific,we propose thatΔ(Mg/Ca)_(*** s.s.-s.l.)may tend to reflect summer mixed layer depth.

关键词： morphotypes Globigerinoides ruber(white) Trilobatus sacculifer Mg/Ca ratios mixed-layer depth

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

阿帕替尼联合卡培他滨及替莫唑胺治疗转移性胃肠胰神经内分泌肿瘤的有效性及安全性研究

引用

重庆医学 2024年第17期53卷 2593-2597页

作者：李铁钢崔志强中国人民解放军联勤保障部队第九八〇医院肿瘤科石家庄050082 河北工程大学附属医院乳腺外一科河北邯郸056000

目的探讨阿帕替尼联合卡培他滨及替莫唑胺治疗转移性胃肠胰神经内分泌肿瘤的有效性及安全性。方法选取2020年1月至2023年6月中国人民解放军联勤保障部队第九八〇医院收治的28例转移性胃肠胰神经内分泌肿瘤患者为研究对象,根据治疗方案... 详细信息

目的探讨阿帕替尼联合卡培他滨及替莫唑胺治疗转移性胃肠胰神经内分泌肿瘤的有效性及安全性。方法选取2020年1月至2023年6月中国人民解放军联勤保障部队第九八〇医院收治的28例转移性胃肠胰神经内分泌肿瘤患者为研究对象,根据治疗方案的不同分为试验组(n=13)和对照组(n=15)。试验组给予阿帕替尼联合卡培他滨及替莫唑胺治疗,对照组给予卡培他滨及替莫唑胺治疗,直至疾病进展(PD)或不良反应不可耐受,主要观察指标为中位无进展生存(PFS)时间,次要终点包括客观缓解率(ORR)、疾病控制率(DCR)及不良反应情况。结果试验组完全缓解(CR)0例,部分缓解(PR)6例,疾病稳定(SD)4例,PD 3例,ORR为46.15%,DCR为76.92%,中位PFS时间为10.8个月。对照组CR 0例,PR 5例,SD 4例,PD 6例,ORR为33.33%,DCR为60.00%,中位PFS时间为9.2个月。试验组较对照组PFS时间延长1.6个月,PD或死亡风险下降58%(HR=0.42,95%CI:0.19~0.93,P=0.0094)。试验组发生化疗药物相关不良反应,同时也出现抗血管生成靶向药相关不良反应,但两组不良反应均为1~2级,予以治疗后可耐受。结论阿帕替尼联合卡培他滨及替莫唑胺治疗转移性胃肠胰神经内分泌肿瘤有效、安全。

关键词：胃肠胰神经内分泌肿瘤阿帕替尼替莫唑胺卡培他滨酪氨酸激酶抑制剂

来源：

维普期刊数据库博看期刊

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Relative paleointensity of the geomagnetic field during the past 200 ka from the West Philippine Sea and its chronological significance

引用

Science China Earth Sciences 2009年第8期52卷 1115-1126页

作者： QingYong Meng AnChun li tiegang li FuQing Jiang XiaoJing Zhou Key Lab of Marine Geology & Environment Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China

Our rock magnetic analysis of core Ph05 from the West Philippine Sea demonstrates that the core preserves a strong, stable remanent magnetization and meets the magnetic mineral criteria for relative paleointensity (RP... 详细信息

关键词： West Philippine Sea relative paleointensity geomagnetic field

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Sea surface temperature evolution in the Yellow Sea Warm Current pathway and its teleconnection with high and low latitude forcing during the mid-late Holocene

引用

Journal of Oceanology and limnology 2022年第1期40卷 93-109页

作者： Zhong PI Fengming CHANG tiegang li Yikun CUI Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of OceanographyMinistry of Natural Resources(MNR)Qingdao 266061China Laboratory for Marine Geology and Environment Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China School of Geography and Ocean Science Collaborative Innovation Center of South China Sea StudiesNanjing UniversityNanjing 210023China

Sea surface temperature(SST)in the Yellow Sea Warm Current(YSWC)pathway is sensitive to the East Asian Winter Monsoon(EAWM)and ***,the role of the YSWC in the evolution of regional SST remains ***,we present new U 37 k′based SST and grain size sequences spanning the last 6092 years in the sediment core Z1,which was retrieved from the central Yellow Sea muddy ***,U 37 k′-SST gradually increased since 6.1 ka BP,with a series of centennial-scale fl *** variation was mainly caused by EAWM when YSWC was weak between 6.1 and~3.9 ka BP,as shown by the end-member content of grain ***,after YSWC was fully developed,i.e.,since~3.9 ka BP,it exerted critical eff ects on SST evolution in its *** 1010-and 538-year cycles of the SST sequence indicated a basic control of solar activity on the oceanic conditions in the Yellow *** is suggested that the variation of total solar irradiance was amplifi ed by thermohaline circulation and then transmitted to the Yellow Sea through the ***,the tropical Pacifi c signal of El Niño was transmitted to the YSWC through the Kuroshio *** dual properties of warm water transported by YSWC to compensate the EAWM and driving by Kuroshio Current closely linked the variation of SST in the YSWC pathway to the Northern Hemisphere high latitude climate and the tropical Pacifi *** fi ndings highlight the signifi cance of YSWC on regional SST evolution and its teleconnection to high and low latitude forcing,which grains a better understanding of the long-term evolution of SST in the middle latitude Yellow Sea.

关键词： Yellow Sea Warm Current U 37 k′-SST East Asian Winter Monsoon Kuroshio Current high and low latitude forcing

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Late Holocene paleoenvironmental changes in the southern Okinawa Trough inferred from a diatom record

引用

Chinese Science Bulletin 2011年第11期56卷 1131-1138页

作者： li Dongling JIANG Hui li tiegang ZHAO MeiXun Key Laboratory of Geographic Information Science East China Normal University Shanghai 200062 China Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Key Laboratory of Theoretical and Applied Marine Chemistry and Chemical Engineering of the Ministry of Education Ocean University of China Qingdao 266100 China

We analyzed sediment diatoms from core MD05-2908 to infer climate and paleoenvironmental changes in the southern Okinawa Trough (SOT) over the past 1000 *** the study area is located in the East Asia monsoon area and beneath the main axis of Kuroshio Current,the climatic and hydrographical conditions are strongly influenced by both of these *** species used as environmental indicators,including the Kuroshio Current species (KC species) and freshwater species,were investigated in this *** in the abundance of the two groups of species revealed significant variations in water temperature and hydrography in the SOT during the Medieval Warm Period (MWP) and the little Ice Age (liA).From 950-1500 AD,the abundance of the KC species increased fluctuantly,while the freshwater species decreased,showing that the influence of the Kuroshio Current was intensified at that interval and the precipitation of the study area was relatively *** KC species decreased remarkably and was maintained at a low abundance during the interval of 1500-1900 AD,which suggests that the impact of the Kuroshio Current on the SOT weakened during the period corresponding to the ***,the high abundance of the freshwater species at the same interval indicates a distinct increase in precipitation in northeastern Taiwan,which may be correlated to the south-detention of the rainfall belt in China caused by the southward migration of the western Pacific subtropical high.

关键词：古环境变化冲绳海槽沉积硅藻晚全新世西太平洋副热带高压物种丰度时间间隔东亚季风区

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Geochemical processes controlling dissolved selenium in the Changjiang(Yangtze) Estuary and its adjacent waters

引用

Acta Oceanologica Sinica 2014年第10期33卷 19-29页

作者： WU Xiaodan SONG Jinming WU Bin li tiegang li Xuegang Institute of Oceanology Chinese Academy of Sciences University of Chinese Academy of Sciences

Dissolved selenium in the Changjiang（Yangtze） Estuary and its adjacent waters was determined by hydride generation atomic fluorescence spectrometry to elucidate the source, behavior in estuary, adsorption-desorption process and biological role. In surface water, Se（IV） concentration ranged 0.05–1.14 nmol/L and Se（VI） concentration varied 0.01–1.20 nmol/L, with the means of 0.76 and 0.49 nmol/L, respectively. In bottom water, Se（IV） content varied 0.03–0.27 nmol/L and Se（VI） content ranged 0.04–0.85 nmol/L, with the averages of 0.10 and 0.40 nmol/L, respectively. High level of Se（IV） was observed near the shore with a significant decrease towards the open sea, suggesting the continental input from the adjacent rivers. Large value of Se（VI） was found in bottom water, reflecting the release from suspended sediment. Besides, high value appeared in the same latitude of the Changjiang Estuary and Hangzhou Bay illustrated the effect of lateral mixing and the long-distance transport of selenium. Se（VI）, more soluble, occupied higher percentage in aqueous environment. The presence of Se（IV） resulted from the degradation of residue and the reduction of Se（VI） under anaerobic condition. The positive relationship to suspended particulate material（SPM） and negative correlation to depth indicated that Se（IV） tended to be released from the high density particulate matter. Instead, Se（VI） content did not significantly relate to SPM since it generally formed inner-sphere complex to iron hydroxide. Se（IV） content negatively varied to salinity and largely depended on the freshwater dilution and physical mixing. While, Se（VI） level deviated from the dilution line due to the in situ biogeochemical process such as removal via phytoplankton uptake and inputs via organic matter regeneration. As the essential element, Se（IV） was confirmed more bioavailable to phytoplankton growth than Se（VI）, and moreover, seemed to be more related to phosphorus than to nitrogen.

关键词： dissolved selenium distribution geochemical behavior Changjiang(Yangtze) Estuary

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The sedimentation rates in the Okinawa Trough during the Late Quaternary

引用

Acta Oceanologica Sinica 2005年第4期24卷 146-154页

作者： XIONG Yingqian liU Zhenxia li tiegang liU Yanguang YU Hua Ocean University of China Qingdao 266003 China First Institute of Oceanography State Oceanic Administration Qingdao 266061 China Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China

On the basis of accelerator mass spectrometer radiocarbon （AMS ^14C） dating, sedimentation rates of 11 cores collected from the northern to southern Okinawa Trough are discussed. The sedimentation rates in the Okinawa Trough roughly range from 11 to 39cm/ka, and the average is 23.0cm/ka. China＇s continental matter is the main sediment source of the middle Okinawa Trough and has important contribution to the northern and southern Okinawa Trough. The sedimentation rates during the marine oxygen isotope （MIS） 2 are uniformly higher than those during MIS 1 in the northern and middle Okinawa Trough while they are on the contrary in the southern Okinawa Trough. Sedimentation rates in the Okinawa Trough can be one of the proxies of sediment source and an indicator of cooling events.

关键词： Okinawa Trough Late Quaternary sedimentation rates sediment source cooling events

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Testing the mantle plume hypothesis： an IODP effort to drill into the Kamchatka-Okhotsk Sea basement

引用

科学通报：英文版 2017年第21期62卷 1464-1472页

作者： Yaoling Niu Xuefa Shi tiegang li Shiguo Wu Weidong Sun Rixiang Zhu Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266061China Department of Earth Sciences Durham UniversityDurham DH1 3LEUK lnstitute of Oceanology Chinese Acadermy of SciencesQingdao 266071.China First Institute of Oceanography State Oceanic AdministrationQingdao 266061China Institute of Deep-sea Science and Engineering Chinese Acadery of SciencesSanya 572000China Institute of Geology 8 Geophysics Chinese Academy of SciencesBeijing 100029China

The great mantle plume debate(GPD) has been going on for ~15 years(Foulger and Natland, 2003;Anderson, 2004; Niu, 2005; Davies, 2005; Foulger, 2005; Campbell, 2005; Campbell and Davies, 2006),centered on whether mantle plumes exist as a result of Earth's cooling or whether their existence is purely required for convenience in explaining certain Earth phenomena(Niu, 2005). Despite the mounting evidence that many of the so-called plumes may be localized melting anomalies, the debate is likely to continue. We recognize that the slow progress of the debate results from communication *** debaters may not truly appreciate(1) what the mantle plume hypothesis actually is, and(2) none of the petrological, geochemical and geophysical methods widely used can actually provide smoking-gun evidence for or against mantle plume hypothesis. In this short paper, we clarify these issues, and elaborate a geologically effective approach to test the hypothesis. According to the mantle plume hypothesis, a thermal mantle plume must originate from the thermal boundary layer at the core-mantle boundary(CMB), and a large mantle plume head is required to carry the material from the deep mantle to the surface. The plume head product in ocean basins is the oceanic plateau, which is a lithospheric terrane that is large(1000's km across), thick(>200 km), shallow(2–4 km high above the surrounding seafloors), buoyant(~1% less dense than the surrounding lithosphere), and thus must be preserved in the surface geology(Niu et al., 2003). The Hawaiian volcanism has been considered as the surface expression of a type mantle plume, but it does not seem to have a(known) plume head product. If this is true, the Hawaiian mantle plume in particular and the mantle plume hypothesis in general must be questioned. Therefore, whether there is an oceanic plateau-like product for the Hawaiian volcanism is key to testing the mantle plume hypothesis, and the Kamchatka-Okhotsk Sea basement is the best cand

关键词： Mantle plume debate Geologically testing plume hypothesis Drilling into Kamchatka-Okhotsk Sea basement

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Sedimentation rates and provenance analysis in the Southwestern Okinawa Trough since the mid-Holocene

引用

Chinese Science Bulletin 2009年第7期54卷 1234-1242页

作者： li ChuanShun JIANG Bo li AnChun li tiegang JIANG FuQing Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Graduate University Chinese Academy of Sciences Beijing 100049 China China Ocean Press Beijing 100081 China

As a high-sedimentation rate depocenter along the path of the Kuroshio Current, the southwesternmost part of the Okinawa Trough is a key area to understand the Kuroshio history and sediments transpor-tation. A 34.17-m-long sediment core was obtained by the advanced piston corer of Marco Polo/IMAGES XII MARION DUFRESNE during the May 2005 from the Southern Okinawa Trough at site MD05-2908. The recovered sediments were analyzed by AMS 14C dating, coarse size fraction (>63 μm) extraction and moisture content determination in order to study its sedimentation flux and provenance. The depth-age relationship of core MD05-2908 was well constrained by 17 14C dating points. The sediments span across the mid-Holocene (6.8 ka B.P.) and have remarkablely high sedimentation rates between 1.8 and 21.2 m ka?1, which is well consistent with the modern observations from sediment traps. We identified five 70―200 a periods of abnormally rapid sedimentation events at 6790―6600 a B.P., 5690―5600 a B.P., 4820―4720 a B.P., 1090―880 a B.P., and 260―190 a B.P., during which the highest sedimentation rate is up to 21.2 m/ka. In general, the lithology of the sediments were dominated by silt and clay, associated with less than 5% coarse size fraction (>63 μm). As the most significant sediment source, the Lanyang River in northeastern Taiwan annually deliver about 10Mt materials to the coastal and offshore region of northeast Taiwan, a portion of which could be carried northward by currents toward the study area. Therefore, we concluded that the 5 abnormally rapid sedimentation events may be related to intensified rainfall in Taiwan and thus increased materials to our study area at that time. However, a few extreme-rapid sedimentation events cannot be explained by normal river runoff alone. The large earth-quakes or typhoons induced hyperpycnal discharge of fluvial sediment to the ocean may also act as a potential source supply to the Okinawa Trough.

关键词：南冲绳海槽沉积速率河流沉积物异常事件中期西南泥沙来源马可波罗

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：