中国人海经济系统环境适应性演化及预警     

李博  史钊源  田闯  苏飞  彭飞 《地理科学》2019,39(4):533-540

基于敏感性-稳定性-响应3维要素构建指标体系,运用熵值法和ARIMA-BP组合预测模型研究中国人海经济系统环境适应性的演化及预警。结果表明：① 2001~2016年中国人海经济系统环境适应性呈稳定上升态势,总体集中于中警状态,期间经历了“人海环境系统比较优势阶段→耦合协调阶段→人海经济系统比较优势阶段”的双螺旋适应过程,预计2017~2020年再次进入相互契合的轻警状态;② 16 a间中国人海经济系统环境适应性波动存在上升期短-衰退期长现象,预计未来4 a人海经济系统环境适应性在经济下行和生态约束背景下的速率不容乐观;③ 权衡人海经济系统和人海环境系统的关系,追求总体效益最大化,延长适应性周期波动中扩张期活动,差别化和灵活性的适应行为是未来主要排警对策。  相似文献   

渤、黄海北部海冰年代时空变化特征分析   总被引：3，自引：1，他引：2  

王相玉  张惠滋  严素  温连杰  郭可彩  袁本坤  商杰 《海洋预报》2007,24(2):26-32

本文取上世纪后50年至2003年度冬季渤海地区气温作为与渤海冬季冰情有关的气候指标。分析得出,渤海地区冬季气温随着年代呈上升趋势,特别是80年代中期至本世纪初尤为明显。受其影响,渤海冬季的冰情时空分布状况发生了较大变化。其特点是:初冰日较多年平均值推后、终冰日较多年平均值提前,冰期较多年平均值偏短,冰厚较多年平均值偏薄,结冰范围(沿岸固定冰宽度和浮冰外缘线)较多年平均值偏小,甚至有些海区已多年未曾见到海冰了。  相似文献   

Initiation of primary cell culture from amphioxus <Emphasis Type="Italic">Branchiostoma belcheri tsingtauense</Emphasis>     

王昌留  张士璀  宿烽  王磊  李红岩 《中国海洋湖沼学报》2009,27(1):69-73

Amphioxus, a cephalochordate, is an important model fish for studies in evolution and comparative biology. A successful cell culture from amphioxus tissues in vitro would help understanding some basic issues. To determine the optimal culture conditions for proliferation of amphioxus cells, primary cultures were initiated from buccal cirri, tail, gill, gut and metapleural fold of amphioxus Branchiostoma belcheri tsingtauense. The media tested were L-15, F-12, M 199, MEM, DMEM, PRMI 1640 and LDF, each was supplemented with 20% fetal bovine serum. The optimal conditions include tail tissue cultured in L-15 or F-12 with supplement of 20% FBS and 1.5% NaCl at about 25°C. Supported by Doctoral Initial Fund of Ludong University (No.43304)  相似文献   

临沂市土地整理项目后期管护的做法   总被引：2，自引：0，他引：2  

苏超  李静  崔亮 《山东国土资源》2009,25(5)

临沂市地处沂蒙山区,山区、丘陵、平原各占三分之一。近几年,临沂市政府高度重视土地开发整理工作,自2003年以来,共实施国家级项目17个、省级项目12个、市级项目177个、县级项目1130个,争取国家和省级资金5.3亿元,投入市、县级项目资金6.6亿多元,项目总规模9.8万hm^2,新增耕地2.2万余公顷,新建新修灌溉水渠347.89km,  相似文献   

泥蚶锰超氧化物歧化酶基因的研究     

杜丽丽  李太武  苏秀榕  李登峰  潘沙芳 《海洋科学集刊》2009,49(49):115-118

Special primers were designed based on the sequence information of superoxide dismutase genes reported in the Iiterature and were used for RT-PCR and rapid amplification of cDNA ends(RACE) to clone Tegillarca granosaMn-superoxide dismutase gene successfully.The length cDNA of Tegillarca granosaMn-superoxide dismutase gene was of 635bp by including a 3^'untranslated region(UTR)of 230bp and an open reading frame(ORF) of 4.5bp encoding a polypeptide of 135 amino acids. TheTegillarca granosaMn-superoxide dismutase gene shares 66%~73% homology with Mizuhopecteb yessoensis^'s,Danio rerio^'s,Xenopus Laevis^'s,Human^'s,Callinectes sapidus^'sSOD CDS, while the corresponding amino acids shares 68%-78% homology and 80%~89% comparability. These indicate the SOD gene is high evolutional conservation in animals.  相似文献   

Optimizing support vector machine learning for semi-arid vegetation mapping by using clustering analysis   总被引：1，自引：0，他引：1  

Lihong Su   《ISPRS Journal of Photogrammetry and Remote Sensing》2009,64(4):407-413

In remote sensing communities, support vector machine (SVM) learning has recently received increasing attention. SVM learning usually requires large memory and enormous amounts of computation time on large training sets. According to SVM algorithms, the SVM classification decision function is fully determined by support vectors, which compose a subset of the training sets. In this regard, a solution to optimize SVM learning is to efficiently reduce training sets. In this paper, a data reduction method based on agglomerative hierarchical clustering is proposed to obtain smaller training sets for SVM learning. Using a multiple angle remote sensing dataset of a semi-arid region, the effectiveness of the proposed method is evaluated by classification experiments with a series of reduced training sets. The experiments show that there is no loss of SVM accuracy when the original training set is reduced to 34% using the proposed approach. Maximum likelihood classification (MLC) also is applied on the reduced training sets. The results show that MLC can also maintain the classification accuracy. This implies that the most informative data instances can be retained by this approach.  相似文献   

东营凹陷低渗透油藏分布规律及储层改造效果     

苏国英 《海洋地质译丛》2008,(4):21-25

东营凹陷2001年之前探明的低渗透油藏主要分布在洼陷带、中央背斜带及北部陡坡带,以沙三段深水浊积扇及沙四段滨浅湖相砂岩滩坝、扇三角洲前缘等沉积体系为主。油藏类型主要是岩性油藏,其次为构造—岩性复合型油藏。低渗透油藏以中深层、常压-超高压、低产、中产为特征,多为特小型、小型油藏,储量丰度为低丰度~特低丰度。低渗透油藏的探井试油过程中,经历了从酸化逐步到压裂的技术发展过程。统计探井的试油效果表明,沙四段碳酸盐含量较高的砂岩低渗透油藏,酸化效果较好;黏土含量较高的沙三段低渗透油藏,压裂效果较好。  相似文献   

Enhancement of jellyfish (Aurelia aurita) populations by extensive aquaculture rafts in a coastal lagoon in Taiwan   总被引：1，自引：0，他引：1  

Lo  Wen-Tseng; Purcell  Jennifer E.; Hung  Jia-Jang; Su  Huei-Meei; Hsu  Pei-Kai 《ICES Journal of Marine Science》2008,65(3):453-461

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Antiangiogenic activity of low-temperature lysozyme from a marine bacterium <Emphasis Type="Italic">in vivo</Emphasis> and <Emphasis Type="Italic">in vitro</Emphasis>     

王振华  刘金成  苏爱  孙谧  王春波 《中国海洋湖沼学报》2009,27(4):835-844

We extracted marine low-temperature lysozyme (MLTL), a novel lysozyme, from a marine microorganism through fermentation. Our previous study suggested that a low molecular weight (16 kDa) may exert anti-tumor activity through antiangiogenesis. In this study, we extracted a high weight (39 kDa) and investigated its antiangiogenic activity in vivo and in vitro. Using zebrafish embryos as an in vivo study model, we found that treatment with MLTL significantly inhibited the growth of subintestinal vessels (SIVs) in a dose-dependent manner and that 400 μg/ml MLTL was sufficient to block the growth of SIVs. An in vitro study conducted using human umbilical vein endothelial cells (HUVECs) revealed that MLTL suppressed the proliferation, migration and tube formation of HUVECs in a dose-dependent manner. Interestingly, assays by flow cytometry and DNA electrophoresis indicated that MLTL was able to induce apoptosis of HUVECs. Moreover, further study demonstrated that the disruption of intracellular Ca²⁺ homeostasis may play an important role in MLTL induced apoptosis of HUVECs. Taken together, the results of this study demonstrate for the first time that MLTL inhibits angiogenesis through its pleiotropic effects on vascular endothelial cells and induces apoptosis through regulation of cellular Ca²⁺ levels. The results of this study also revealed a possible mechanism underlying the antiangiogenic effect of MLTL and suggested that MLTL may be a promising new antiangiogenic agent for use in cancer therapy.  相似文献   

耿达短水准异常与汶川8.0级地震   总被引：2，自引：1，他引：1  

苏琴  朱航  杨永林 《大地测量与地球动力学》2009,29(Z1):103-105

结合龙门山断裂带其他跨断层资料,对耿达短水准在汶川8.0级地震前后的观测资料进行了重新分析,发现耿达短水准在汶川地震前后的异常为当地居民修建生活小区所致,不应视为地震前兆异常。  相似文献