2017年黄海绿潮特点及绿潮灾害防控新挑战          下载免费PDF全文

刘霜  张洪亮  刘旭东  李瑞瑶  张继民  王梅  宋文鹏 《海岸工程》2018,37(4):62-70

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加拿大政府的矿业政策     

王梅 《国土资源》2001,(3)

概况 加拿大的矿产资源十分丰富，矿产品产量居世界前列，是世界主要的矿产品出日国。在西方发达国家中，加拿大是唯一把矿业作为支柱产业的国象；矿产资源开发在全国及区域社会经济发展中起着十分重要的作用。加拿大矿业投资巨大、技术领先，在加拿大“新经济” 形势下发挥着重要作用。工业及包括环境问题在内的许多问题的国际化改变了加拿大政府制定政策的格局。 １ 加拿大政府面临的机遇与挑战 作为世贸组织成员国．成功的贸易经验为加拿大造就了要开放的矿业出口市场。在吸引外资问题上，加拿大政府在态度转变上是历史性的。以前许多省…  相似文献   

Wintertime Stratospheric Anomalies-Part I: Warm Pools     

Y.L.McHall 《大气科学进展》1992,(3)

The stratospheric worm pools, called the 4-day wave also, are mainly the temperature anomalies in the polar regions of winter hemisphere. It will be shown that their occurrence, propagation speed and specific structure can be explained by the lower frequency coherent heating resulting from the wave interaction in the breaking layers of the stratosphere. Although their vertical phase slope is negligibly small, the warm pools cannot be considered as a barotropic anomaly.  相似文献   

三角帆蚌鳃的组织学研究     

骆大鹏  余祥勇  王梅芳  王佃涛 《广东海洋大学学报》2008,28(3)

对非繁殖期与繁殖前期的雌性三角帆蚌鳃瓣作组织切片,观察其组织形态结构。结果表明,三角帆蚌内、外鳃的鳃丝在组成上是相同的,从外到内,其结构可以分为:上皮、基膜、结缔组织,鳃丝上密布纤毛,鳃丝结缔组织中含吞噬细胞、透明细胞等。外鳃具特有结构——瓣间隔和育儿囊,且在瓣间隔两侧,有发达的小水管系统。由于这种结构的存在,使得内外鳃瓣在鳃瓣厚度、鳃小瓣厚度、鳃丝宽度上存在显著性差异。繁殖前期,内鳃基本无变化,而外鳃发生明显的变化,鳃瓣增厚,鳃腔扩大形成孵化室,为胚胎发育提供一个良好的发育环境。  相似文献   

中日俄输油管道的“折中方案”     

王梅 《国土资源》2003,(4)

争论已久的中日俄石油管道问题近日有了结果,俄政府决定铺设安加尔斯克—纳霍德卡石油主管道,同时建设至中国大庆的分管道,这一“折中方案”对中国更有利。所谓“折中方案”是指将“中俄方案”的安加尔斯克—大庆输油管道和“远东方案”的安加尔斯克一纳霍德卡输油管道的两条线变成一条线——一条有支线经外贝加尔斯克通往中国大庆的安加尔斯克—纳霍卡石油管道干线。  相似文献   

Socio-economic and Environmental Implications of the Hydroelectric Projects in Uttarakhand Himalaya, India   总被引：1，自引：1，他引：0  

Naresh Rana S.P. Sati Y.P. Sundriyal Madan Mohan Doval Navin Juyal 《山地科学学报》2007,4(4):344-353

This paper deals with detailed analysis of the fiasco created by the Tehri High Dam in Uttarakhand, India, particularly in terms of resettlement and rehabilitation of the local inhabitants. Aspects pertaining to the environmental issues are also discussed. Currently, the river valleys in Uttarakhand state of India are the targets of increasing hydroelectric projects. Virtually all rivers are being exploited for generating environmental friendly power. Having being learned the hard lesson from Tehri Dam, it has been decided to opt for such schemes in which comparatively little submergence and tempering with the fragile eco-systems is involved.However, our observations suggest that even in such schemes if due care is not taken they may turn out to be a failure.  相似文献   

一种甲烷连续测量系统的开发并用于某些源区甲烷分布的研究     

TohJi.  Y 裴韬 《地质科学译丛》1995,12(1):58-61

为了调查大气甲烷的区域分布，我们用火焰离子检测器（ＦＩＤ）制成了一台连续测量系统。由于ＦＩＤ几乎对所有的烃类都敏感，故而让样气通过一个装有Ｐｔ催化剂的加热柱体以除去非甲烷烃，得到低达０．００４×１０＾－６Ｖ的检出限和短达１０ｓ的响应时间。我们把该系统装配在汽车上，测量了两个典型源区－稻田和天然气田上大气甲烷的区域分布。在气田的实例中，我们依据所观测的甲烷柱剖面估算了甲烷的逸散率。  相似文献   

布莱克海岭区天然气水合物的评价     

Makogon Y F  吴传芝 《海洋地质前沿》2006,22(1):24-26

布莱克海岭位于美国东南加利福尼亚近海区,该区天然气水合物矿藏可用的开采方案有3种。这些方案为深水环境中天然气水合物矿藏的开采提供了可能的途径。1布莱克海岭区的天然气水合物过去20年中,在布莱克海岭区收集了大量的天然气水合物资料,包括地震勘探资料和11口井的钻井资料  相似文献   

The Japanese medaka (Oryzias latipes) model: applicability for investigating the immunosuppressive effects of the aquatic pollutant benzo[a]pyrene (BaP)     

Carlson EA  Li Y  Zelikoff JT 《Marine environmental research》2002,54(3-5):565-568

Despite the fact that BaP is a carcinogen, mammalian immunosuppressant, and ubiquitous aquatic pollutant, knowledge regarding the effects of BaP on the immune system of fish is still lacking. To begin to fill this gap, studies were conducted in medaka to examine the effects and mechanisms by which BaP exposure might alter host immunocompetence. Fish, exposed by IP injection of BaP (2-600 microg/g BW), were examined after 48 h for effects upon immune function and CYP1A expression/activity. Benzo[a]pyrene, at a concentration below that which increased levels of CYPIA expression/activity (2 microg BaP/g BW) suppressed lymphocyte proliferation. Concentrations of BaP at 20 and 200 microg/g BW. suppressed antibody-forming cell (AFC) numbers, superoxide production, and host resistance against bacteria. In contrast, exposure to the low affinity aryl hydrocarbon receptor (AhR) agonist, benzo[e]pyrene (BeP), neither induced CYP1A expression nor altered immune function. Given the lack of immunosuppressive effects produced by BeP, and the fact that exposure to the AhR antagonist (and CYP1A inhibitor) alpha-naphthoflavone (ANF) ameliorated the suppressive effects of BaP upon AFC numbers, the AhR pathway (including CYP1A-mediated production of reactive BaP metabolites) appears important in mediating BaP-induced immunotoxicity in fish, as in mammals. In the past, the medaka has proven a successful model for assessing carcinogenic agents. These studies have demonstrated its utility for also determining the immunosuppressive effects of an important aquatic contaminant.  相似文献   

“大洋矿产国际会议——天然气水合物专题”论文摘要——7、厌氧条件下甲烷微生物氧化作用形成的碳酸盐构造的地球化学特征     

A.Y.Lein  杨木壮 《海洋地质》2002,(3):37-38

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