检索结果-南通市图书馆

Simulation of sea surface temperature changes in the Middle Pliocene warm period and comparison with reconstructions

引用

chinese Science Bulletin 2011年第9期56卷 890-899页

作者： YAN Qing ZHANG ZhongShi wang huijun JIANG DaBang ZHENG WeiPeng nansen-zhu {2. {3. Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Graduate University of chinese academy of sciences Beijing 100049China Bjerknes Centre for Climate research UniResearchBergen N-5007Norway Climate Change research center Chinese Academy of SciencesBeijing 100029China key Laboratory of Regional Climate-Environment research for Temperate East Asia Chinese Academy of SciencesBeijing 100029China National key Laboratory of Numerical Modeling for Atmospheric sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

The Middle Pliocene (ca 3.12.2.97 Ma) is a recent warm period in the Earth’s history. In many respects, the warmth of the Middle Pliocene is similar to the probable warm situation of the late 2.st century predicted by climate models. Understanding the Middle Pliocene climate is important in predicting the future climate with global warming. Here, we used the latest reconstructions for the Middle Pliocene—Pliocene {3. Interpretation and Synoptic Mapping (PRISM) version 3.to simulate the Middle Pliocene climate with a fully coupled model Fast Ocean Atmosphere Model. From comparison of the results of simulations with reconstructions, we considered two important scientific topics of Middle Pliocene climate modeling: extreme warming in the subpolar North Atlantic and a permanent El Ni?o in the tropical Pacific. Our simulations illustrate that the global annual mean sea surface temperature (SST) in the Middle Pliocene was about 2.3°C higher than that in the pre-industrial era. The warming was stronger at midand high latitudes than at low latitudes. The simulated SST changes agree with SST reconstructions in PRISM3.data, especially for the North Atlantic, North Pacific and west coast of South America. However, there were still discrepancies between the simulation of the SST and reconstructions for the subpolar North Atlantic and tropical Pacific. In the case of the Atlantic, the wea{2.ned meridional overturning circulation in the simulation did not support the reconstruction of the extremely warm condition in the subpolar North Atlantic. In the case of the tropical Pacific, the whole ocean warmed, especially the eastern tropical Pacific, which did not support the permanent El Ni?o suggested by the reconstruction. From evaluation of the modeling and reconstruction, we suggest that the above discrepancies were due to uncertainties in reconstructions, difficulties in paleoclimate modeling and deficiencies of climate models. The discrepancies should be reduced through cons

关键词：上新世中东温度变化未来气候变化热带太平洋气候模拟北大西洋仿真

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

国际研发伙伴地理特征与创新成功和创新失败——“多多益善”还是“舍近求远”?

引用

科技管理研究 2024年第5期44卷 72-81页

作者：李凡杨林丽朱缤绮北京第二外国语学院商学院北京100024

基于2.15—2.2.年161家中国高技术产业企业的观测数据,以地理特征为核心,科学度量研发伙伴的地理邻近性和地理多样性,运用双变量Probit模型检验和比较不同情境下研发伙伴选择对创新成功和创新失败的影响,拓展经济地理学和知识基础观理... 详细信息

基于2.15—2.2.年161家中国高技术产业企业的观测数据,以地理特征为核心,科学度量研发伙伴的地理邻近性和地理多样性,运用双变量Probit模型检验和比较不同情境下研发伙伴选择对创新成功和创新失败的影响,拓展经济地理学和知识基础观理论在国际研发伙伴选择中的应用。结果表明:(1)研发伙伴地理邻近性和多样性均会对创新成功和创新失败产生正向影响;(2.地理邻近性较高的研发伙伴对创新成功的促进作用更强,地理邻近性较低的研发伙伴对创新失败的促进作用更强;({4.地理多样性较低的研发伙伴对创新成功的促进作用更强,地理多样性较高的研发伙伴对创新成功和创新失败均有显著正向影响,但影响差异不明显。

关键词：研发伙伴地理邻近性地理多样性创新成功创新失败

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

Relationship between the Late Spring NAO and Summer Extreme Precipitation Frequency in the Middle and Lower Reaches of the Yangtze River

引用

Atmospheric and Oceanic Science Letters 2012年第6期5卷 455-460页

作者： TTIAN Bao-Qiang fan ke nansen-zhu {2. {3. Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of chinese academy of sciences Beijing 100049China key Laboratory of Regional Climate-Environment for East Asia Chinese Academy of Sciences Beijing 100029China

The relationship between the late spring North Atlantic Oscillation (NAO) and the summer extreme precipitation frequency (EPF) in the middle and lower reaches of the Yangtze River Valley (MLYRV) is examined using an NECP/NCAR reanalysis dataset and daily precipitation data from 74.stations in the MLYRV. The results show a significant negative correlation between the May NAO index and the EPF over the MLYRV in the subsequent summer. In positive EPF index years, the East Asian westerly jet shifts farther southward, and two blocking high positive anomalies appear over the Sea of Okhotsk and the Ural Mountains. These anomalies are favorable to the cold air from the mid-high latitudes invading the Yangtze River Valley (YRV). The moisture convergence and the ascending motion dominate the MLYRV. The above patterns are reversed in negative EPF index years. A wave train pattern that originates from the North Atlantic extends eastward to the Mediterranean and then moves to the Tibetan Plateau and from there to the YRV, which is an important link in the May NAO and the summer extreme precipitation in the MLYRV. The wave train may be aroused by the tripole pattern of the SST, which can explain why the May NAO affects the summer EPF in the MLYRV.

关键词： North Atlantic Oscillation summer extreme precipitation frequency the middle and lower reaches of the Yangtze River Valley East Asian westerly jet

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

Spatial and Temporal Distribution of Polycyclic Musks in Water and Sediment Environment of Songhua River

Spatial and Temporal Distribution of Polycyclic Musks in Wat...

引用

持久性有机污染物论坛2.11暨第六届持久性有机污染物全国学术研讨会

作者： Liu Feng~1,Liyan Liu~1,NingZheng zhu~1,Hong Qi~1,WanLi Ma~1,Yi-fan Li~(1,2.) (1 {2. Joint {4. center for Persistent Toxic Substances(IJRC-PTS),State key Laboratory of Urban Water Resource and Environment,Harbin {3. of Technology,Harbin 150090,China 2.Air Quality {4. Division,Science and Technology Branch,Environment Canada,Toronto,Ontario M3.5T4.Canada.

*** Polycyclic musks are the mainly components of personal care products and household cleaners,due to their lower price,elegant fragrance and stable property for maintaining the integrity of the products scent,they occupied 70%of the total world market of synthetic musks in 1996,amongst them,HHCB and AHTN are the most important and widely used polycyclic *** of their bioconcentration tendency and lipophilicity,logK values of 5.4.6.3.Kannan et al.,2.05),the risks caused by these components accumulating in fish and human fat tissues should be concerned.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Design and testing of a global climate prediction system based on a coupled climate model

引用

Science China Earth sciences 2014年第8期57卷 2417-2427页

作者： MA JieHua wang huijun Climate Change research center Chinese Academy of Sciences nansen-zhu {2. {3.{4. Institute of Atmospheric Physics Chinese Academy of Sciences

A global climate prediction system （PCCSM4. was developed based on the Community Climate System Model, version 4.0, developed by the National center for Atmospheric research （NCAR）, and an initialization scheme was designed by our group. Thirty-year （1981-{2.0） one-month-lead retrospective summer climate ensemble predictions were carded out and analyzed. The results showed that PCCSM4.can efficiently capture the main characteristics of JJA mean sea surface temperature （SST）, sea level pressure （SLP）, and precipitation. The prediction skill for SST is high, especially over the central and eastern Pacific where the influence of E1 Nino-Southem Oscillation （ENSO） is dominant. Temporal correlation coefficients between the pre- dicted Nino3.4.index and observed Nino3.4.index over the 3. years reach 0.7, exceeding the 99% statistical significance level. The prediction of 500-hPa geopotential height, 850-hPa zonal wind and SLP shows greater skill than for precipitation. Overall, the predictability in PCCSM4.is much higher in the tropics than in global terms, or over East Asia. Furthermore, PCCSM4.can simulate the summer climate in typical ENSO years and the interannual variability of the Asian summer monsoon well. These preliminary results suggest that PCCSM4.can be applied to real-time prediction after further testing and improvement.

关键词： climate model climate prediction ENSO monsoon

来源：

维普期刊数据库

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

Deformation mechanism of fine structure and its quantitative relationship with quasi-static mechanical properties in near β-type Ti-4.5Mo-5.1Al-1.8Zr-1.1Sn-2.5Cr-2.9Zn alloy

引用

Progress in Natural Science:Materials international 2021年第5期31卷 742-748页

作者： Xinjie zhu Qunbo fan Duoduo {2. Haichao Gong Yu Gao Hong Yu Xing{2. Cheng Zhiming Zhou Liu Yang National key Laboratory of Science and Technology on Materials Under Shock and Impact School of Materials Science and Engineering Beijing Institute of Technology Beijing institute of Technology Chongqing Innovation center School of Materials Science and Engineering Chongqing University of Technology Chengdu Advanced Metal Materials Industrial Technology research institute Co.Ltd.

The deformation mechanism of the fine structure composed of primary α phase(αp) and acicular secondary αphase(αs) on quasi-static mechanical properties is still not very clear. The main controversy is focused on the role of αpin the mechanical behavior. In this paper, the microstructure of the heat-treated near β-type Ti-4.5 Mo-5.1 Al-1.8 Zr-1.1 Sn-2.5 Cr-2.9 Zn alloy after tensile tests was observed by transmission electron microscopy(TEM). And the results showed that in the slight deformation region the dislocations were accumulated at the intersection ofαpand β matrix separated by αs, while only a few dislocations nucleated in β matrix. In the severe deformation region, a large quantity of dislocations in both αpand β matrix were observed. It can be inferred that αpdeformed firstly and then activated the deformation of β matrix, that is, the thickness of αpand the inter-particle spacing ofαsplayed a dominant role in the deformation process. The quantitative relationship between the yield strength and the microstructure parameters is consistent with this inference. By adjusting the solution treatment parameters and the subsequent aging treatment, three fine structures were obtained, and the corresponding mechanical properties were determined. Furthermore, the yield strength can be described by the mathematical model σy= 756.4.+ 13..6/hp1/2.32.2.ds1/2. where hpand dsare the thickness of αpand the inter-particle spacing of αs,respectively.

关键词： Deformation mechanism Fine structure Quantitative relationship Titanium alloy

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Recombinant humanized collagen remodels endometrial immune microenvironment of chronic endometritis through macrophage immunomodulation

引用

Regenerative Biomaterials 2023年第1期10卷 853-869页

作者： Shuang You Yun zhu Hu Li fan He Shuaibin Liu Xia Yang Li {2. Hui Zeng Jingcong Dai Lina Hu Department of Obstetrics and Gynecology The Second Affiliated HospitalChongqing Medical UniversityChongqing 400010China National Laboratory of Biomacromolecules Institute of BiophysicsChinese Academy of SciencesBeijing 100101China Joint international research Lab for Reproduction and Development Ministry of EducationChongqing 400010China Shanxi Jinbo Pharmaceutical Co. LtdTaiyuanShanxi 030031China Reproduction and Stem Cell Therapy research center of Chongqing Chongqing 400010China center for Collagen Transformation of Chongqing Medical University Chongqing 400010China

Recently,evidence has suggested that chronic endometritis(CE)is a crucial factor associated with infertility and failure of assisted reproductive techniques,prompting concern in the reproductive *** have shown that persistent infiltered immune cells stimulation result in the disturbance of endometrial immune microenvironment could lead to the infertility of CE patients *** treatments are limited because they lack immune regulation,so it is urgent to develop a novel approach to treat CE and promote embryo implantation in patients with ***,we prepared recombinant humanized type III collagen(rhCol III)with high cell adhesion activity to regulate macrophages and repair the *** this study,M1 macrophages and M1 macrophages cultured medium and lipopolysaccharide(LPS)co-stimulated inflammatory endometrium stromal cells(ESCs)were established in vitro to mimic CE *** III promoted M1 macrophages toward M2.phenotype,improved cell migration,viability and collagen components of inflammatory ***,the inflammatory response of inflammatory ESCs was downregulated after rhCol III ***,LPS was used for CE rat model and a 2.-day observation was performed;inflammatory cells’infiltration,endometrium repair,extracellular matrix(ECM)remodeling and pregnancy outcomes were promoted after rhCol III endometrial *** conclusion,rhCol III promoted(i)macrophage polarization toward M2.macrophages,(ii)pro-inflammatory cytokine production and anti-inflammatory cytokine reduction,(iii)ECM remodeling and(iv)fertility ***,rhCol III enhanced cell biological functions by interacting with discoidin domain receptors,regulated cell metabolism and reduced the inflammatory response through the inhibition of the NF-κB/YAP signaling ***,the results illustrated the potential therapeutic prospects of rhCol III for CE treatment.

关键词： chronic endometritis recombinant humanized collagen type III collagen macrophages

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Two different periods of high dust weather frequency in northern China

引用

Atmospheric and Oceanic Science Letters 2016年第4期9卷 263-269页

作者： fan ke XIE Zhi-Ming XU Zhi-Qing nansen-zhu {2. {3. Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Collaborative Innovation center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science&TechnologyNanjingChina University of the chinese academy of sciences BeijingChina Climate Change research center Chinese Academy of SciencesBeijingChina

This study reveals that, during the period 1966-2.14. dust weather frequency （DWF） in northern China （north of 3.°N） features two high-DWF periods, in 1966-1979 （PI） and 2.00-2.14.（P2., when the linear trend of DWF is removed during the study period. Here, DWF denotes the number of days of dust weather events in the spring season （March-April-May）, including dust haze, blowing dust, and dust storms, which occurred in northern China. The results show that the DWF is much higher in PI than in P2. with increased DWF distributed over southern Xinjiang, the central part of northern China. The main cause is the SST difference in the Atlantic and Pacific between the two periods. It is also found that a meridional teleconnection over East Asia in PI and a zonal wave-li{2. pattern over Eurasia in P2.at 2.0 hPa play a significant role in the interannual variability in the two periods, respectively. SST over the subtropical North Atlantic （extratropical SST between the Norwegian and Barents seas） may partly contribute to the upper-level meridional （zonal） teleconnection in PI （P2..

关键词： Dust weather frequency northern China meridionalteleconnection zonal wave-like pattern North AtlanticSST

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

Epidermal growth factor improves intestinal morphology by stimulating proliferation and differentiation of enterocytes and mTOR signaling pathway in weaning piglets

引用

Science China(Life sciences) 2020年第2期63卷 259-268页

作者： Lixia wang fan {2. Huansheng Yang Jianzhong Li Yali Li Xueqin Ding Xia Xiong Fengjie Ji Hanlin Zhou Yulong Yin Hunan international Joint Laboratory of Animal Intestinal Ecology and Health Laboratory of Animal Nutrition and Human HealthCollege of Life SciencesHunan Normal UniversityChangsha 410081China Hunan Provincial key Laboratory of Animal Nutritional Physiology and Metabolic Process Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-CentralMinistry of AgricultureHunan Provincial Engineering Research Center for Healthy Livestock and Poultry ProductionKey Laboratory of Agroecological Processes in Subtropical RegionInstitute of Subtropical AgricultureChinese Academy of SciencesChangsha 410125China Academician Workstation of Tropical Crops Genetic Resources institute Chinese Academy of Tropical Agricultural SciencesHaikou 571101China

Epidermal growth factor(EGF) has been shown to improve piglet intestinal morphology and epithelial recovery. In an attempt to further understand the mechanisms behind these improvements, this study tested the hypothesis that dietary EGF may affect intestinal morphology by stimulating the proliferation and differentiation of enterocytes in weaning piglets. In piglets receiving2.0 μg kg^-1 EGF, crypt depth and villus height increased(P4.0 μg kg^-1 EGF increased villus height-to-crypt depth ratio(P2.0 μg kg^-1 EGF significantly increased the number of Ki67-positive cells(P4.0 μg kg^-1 EGF had an increased mRNA level of intestinal alkaline phosphatase(P2.0 μg kg^-1 EGF group. These results suggest that dietary supplementation with a low level of EGF improved piglet intestinal morphology through stimulating the proliferation and differentiation of enterocytes, and the mTOR signaling pathway may partly be involved in this process.

关键词： epidermal growth factor enterocyte proliferation differentiation mTOR signaling weaning piglets

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

A bibliometric analysis of core articles ofinternational nursing research frontiersbased on the Web of Science database

引用

Frontiers of Nursing 2020年第1期7卷 31-38页

作者： Shi-fan Han Jin-Lian Cheng Ya-Ping wang Qiong Chen {2.-Ya Xu Hospital of Shanxi Medical University TaiyuanShanxi 030001China Shanxi Medical University TaiyuanShanxi 030001China Shanxi Medical Periodical Press TaiyuanShanxi 030001China

Objective:To review and analyze the basic information and distribution of core articles in the global research frontier of nursing,so as to ascertain the current trend in the ***:A total of 3. highly cited essential science indicator(ESI)papers in the nursing discipline were retrieved,which were compared with the core article collection of the ESI research frontier in January {2.9 to understand the current nursing research ***,a statistical analysis of the core articles that constituted the nursing research frontiers was performed using a bibliometric *** analysis was conducted with multiple aspects including the number of core articles,total number of citations,average publication year,issuing country,participating institution,citing paper,journal distribution,and core ***:At present,the two {4. research frontiers of nursing are patient-centered care(research Frontier 1)and missed care(research Frontier 2..These two frontiers include a total of 12.core articles,6 of which are highly cited Web of Scienceindexed nursing *** Frontier 1 includes three core articles that were cited 3.9 *** Frontier 2.includes nine core articles that were cited 84. *** in the two frontiers were cited by 4.4.and 84. papers,respectively,most of which are in the United *** addition,the 12.core articles were published across eight journals,the impact factors of which are all relatively ***,research Frontier 1 involves 11 authors,whereas research Frontier 2.involves 4. authors,of which seven authors have published more than two ***:The core articles in the frontier of {4. nursing research demonstrate distinctive features in their issuing country/region,journal distribution,and participating *** and analysis of the core articles of {4. nursing research frontiers can help nursing staff understand the current research hotspots and conseq

关键词： nursing core article research frontier bibliometrics highly cited paper

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：