Review of Social Ecological System Research: An Analysis Based on Bibliometrics     

Xuecheng Ma  Jie Gong  Dongqing Liu  Jinxi Zhang 《地球科学进展》2018,33(4):435-444

Social Ecological System (SES) is the core and highlight of the global change research and sustainability science. Based on Science Citation Index Expanded Database and China National Knowledge Infrastructure, the situation of social ecological system research was analyzed via bibliometrics from 1980 to 2017. The results indicated that: ①The scientific outcomes of social ecological system research are increasing gradually. The developed countries have greatly contributed to it, such as, Sweden and the USA, the leading countries in this field, and Stockholm University is the dominant institution on publication of SES. Cooperation between countries (regions) and institutions is strengthening gradually. ② China is one of the frontier countries in the social ecological system research with a lower increasing speed, its international cooperation and the citation frequency of publications are relatively low, and its international influence should be strengthened in the future. ③ The research highlights are listed as follows: The synergy between social ecological system integrity and social development needs, the complexity and uncertainty of SES, the mechanism between social system and its environmental factors, etc. In addition, under the stress of human activity and global climate change, the research of response and feedback mechanism of SES and policy decision-making are one of the important topics of SES.  相似文献   

Identification of a Putative Tetrasporophyte-Specific Gene in Gracilaria lemaneif ormis （Gracflariales, Rhodophyte）     

REN Xueying ZHANG Xuecheng 《中国海洋大学学报(英文版)》2008,7(3)

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谈谈后勤工作中的科学管理     

张学成 《山西气象》2001,(4):56-57

科学严谨、有条不紊的后勤工作是搞好业务、服务和现代化建设工作的重要保证。忻州市气象局机构改革后，后勤服务中心大胆尝试，勇于创新，走出了一条科学管理的路子，不仅为本单位创出了可观的经济效益，而且后勤服务工作管理的井然有序。一是强化管理，堵塞漏洞。电话管理是忻州局改革前的第一大难题。他们首先从电话管理上开刀动手。局机关长期以来由于电话管理不善，费用高得惊人，机关虽然总共４０余人，但每月电话费却要消耗６０００—８０００元，打私话问题非常严重，过去曾采取过不少措施，但收效甚微。去年他们充分利用电子技术合…  相似文献   

Effective Elastic Thickness of Southeast Part of Arctic Ocean—Eurasia Continent—Pacific Ocean Geoscience Transect     

YuanBingqiang  YvetteHPoudjomDjomani 《中国地质大学学报(英文版)》2002,13(1):20-25

The effective lithospheric elastic thickness of the continent is an important parameter for examination of the large-scale structure and analyses of the mechanism of isostatic compensation within the plate, and a parameter standing for the strength of the lithosphere.The Te values along Quanzhou-Heishui,the southeast section of the Arctic Ocean-Eurasian Continent-Pacific Ocean geoscience transect, are estimated by using the coherence technique developed by Forsyth.Studies of the feature of the coher-ence between gravity and topography suggest that at short wavelengths(6.6-100km)for each data box that is used to estimate Te,the plate is strong enough to support topographic loads and gravity and topog-raphy are uncorrelated.At long wavelengths where the plate is deflected by surface and subsurface loads are compensated by the flexure model.Sichuan land-stone with low heat-flow values has high Te values whereas in Ninghua,Datian,land-stone with high heat-flow values has low Te values,which reflects a correlation,low heat-flow values corresponding to high Te values and high heat-flow values corresponding to low Te values.Te values can be divided into two sections:northwest high section and southeast low sec-tion.There is roughly a positive correlation between crustal thickness and effective elastic thickness of the lithosphere.  相似文献   

多元平稳随机过程游程计算方法的探讨及其应用   总被引：4，自引：0，他引：4       下载免费PDF全文

张学成  丁晶 《水科学进展》1996,7(3):231-238

在一元平稳随机过程游程理论的基础上,提出了多元平稳随机过程游程分析方法,并推导出一系列计算公式。多元平稳随机过程可以划分为四种类型,即:空间和时间均独立的多元平稳随机过程;空间独立,时间相依的多元平稳随机过程;空间相依,时间独立的多元平稳随机过程;空间和时间均相依的多元平稳随机过程。采用统计试验法验证了公式的正确性。将理论方法应用于黄河流域历史干旱重演特性的研究,结果表明:黄河中下游同步发生年干旱现象的重现期为5.78年,连续1年以上发生的重现期为7.76年,连续3年以上出现的重现期为110年左右。  相似文献   

我国水文科学新进展及其展望   总被引：2，自引：0，他引：2  

蔡克疆  张学成 《水文》1998,(5):1-5

随着我国国民经济的发展,水资源可持续性发展的课题摆在我们的面前。这样,对水文科学提出了许多新问题和新要求,例如,水资源供需矛盾日益尖锐,水环境不断恶化,水旱灾害仍是我国的心腹之患;同时人类活动、环境保护又使水情势发生了显著的变化等问题。解决上述问题。要求我国水文业务工作必须有新的内容和新的进展,并适应国际间水文学术交流与合作的需要。本文对我国进四年来的水文科学新和了简要介绍,同时对我国水文科学的发  相似文献   

Studies on selection of low temperature tolerant strain of Brachionus plicatilis     

Zhang Xuecheng  Tan Guiying  Yu Chunyan  Zhao Jufeng 《海洋学报(英文版)》1995,14(4):595-600

Ｓｔｕｄｉｅｓ　ｏｎ　ｓｅｌｅｃｔｉｏｎ　ｏｆ　ｌｏｗ　ｔｅｍｐｅｒａｔｕｒｅ　ｔｏｌｅｒａｎｔ　ｓｔｒａｉｎ　ｏｆ　Ｂｒａｃｈｉｏｎｕｓ　ｐｌｉｃａｔｉｌｉｓ￥／／ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｓｔｕｄｉｅｓｏｎｔｈｅｒｏｔｉｆｅｒＢｒａｃｈｌ＇ｏ...  相似文献   

Induction Effect and Genetic Analysis of NG to Conchospores of Porphyra     

Xu Pu  SHEN Songdong  FEI Xiugeng  Zhang Xuecheng  Zhu Jianyi 《海洋通报(英文版)》2002,4(2)

The new spreading conchospores ot Porphyra yezoensis, P. haitanensis and P. katadai var. hemiphylla are induced by N-Methy-N‘-Nitro-N-Nitrosoguanidine (NG), a strong mutagen to induce the mutant of chromatophore. It is showed that (1) no mutants have been investigated in all control group. (2)The conchospores of all the three species of Porphyra are easy to be induced by NG for they are in the stage of breeding, In the lowest dose (10 μ g/mL) of this experiment, the mutant rate of P. yezoensis is up to 57.9%, that of P. haitanensis 30.7% and that of P. katadai var. hemiphylla 51.7%. (3)The mutant rate can not increase obviously by increasing the reagent concentration or prolonging the induction time. Within the scope of experiment, the inducement effects of three species of Porphyra ar e much similar, and the mutant rate is near 50%. The optimum induction concentration of NG is 10 μ g/mL, and the optimum induction time is 30 minutes.  相似文献   

海面溢油轨迹的分析与预报   总被引：3，自引：0，他引：3  

娄安刚  奚盘根  黄祖珂  石磊  王学昌 《中国海洋大学学报(自然科学版)》1994,(4)

考虑主要分期（Ｍ２，Ｓ２，Ｋ１，Ｏ１，Ｍ４，ＭＳ４）的潮流以及Ｍ２分期的潮汐余流，建立预报潮流场，并考虑海面风力的作用以及油的蒸发和乳化，利用欧拉－拉格朗日方法跟踪油膜的中心点，提出预报油膜的轨迹及其扩散范围。该模型适用于近岸事故溢油的快速预报．  相似文献   

条斑紫菜丝状孢子体cDNA文库构建及抗病相关基因鉴定   总被引：1，自引：3，他引：1  

杨官品  刘永健  孙雪  沈怀舜  许璞  张学成 《中国海洋大学学报(自然科学版)》2003,33(1):47-52

经过微量总 RNA抽提、c DNA合成、c DNA扩增和克隆等步骤 ,构建了微量条斑紫菜丝状孢子体 c DNA文库 ,并进行了小规模表达序列标签分析。从 1 70条标签序列中鉴定出 6条抗病相关基因序列。这些序列可用于研制抗病单核苷酸多态性标记 ,辅助紫菜抗性遗传改良。  相似文献