共查询到20条相似文献,搜索用时 31 毫秒
1.
我国是世界上12个严重缺水国家之一,人均淡水占有量仅是世界人均占有量的四分之一。据有关部门统计,目前,我国668个大中城市中,就有400个缺水,100个严重缺水。华北、东北、西北地区,连年干旱缺雨;南方地区水体污染严重,使水源性缺水成为城市供水的突出问题。淡水资源短缺正严重制约着我国经济的发展。解决我国水资源短缺问题已是全国上下的共识;也是摆在全国人民面前亟待解决的重大课题,当前的问题是加快落实的步伐。 相似文献
2.
3.
Tad Murty 《Marine Geodesy》2013,36(1):85-87
Oceanography, Units 1–16 edited by J. Stewart (Open University Press, 1977), 755 pp. The Thermohaline Fine Structure of the Ocean by K. N. Fedorov (New York: Pergamon Press, Pergamon Marine Series. Volume 2, 1978). Translated from Russian by D. A. Brown, Technical Editor: J. S. Turner, 170 pp., no price listed. The Ocean Basins and Margins edited by Alan E. M. Nairn and Francis G. Stehli, with William H. Kanes (New York: Plenum Press, Vol. 1–4A, 4B, 1973, 1979, 1975, 1977, and 1978) approx. 3,000 pp. Recent Crustal Movements, 1977 edited by C.A. Whitten, R. Green, and B.K. Meade (New York: Elsevier Scientific Publishing Co., 1979), 663 pp., hardcover, $78.00. The Alaskan Shelf‐Hydrographic, Sedimentary, and Geotechnical Environment by Ghanshyam Datt Sharma (New York: Springer Verlag, 1979), 498 pp., hardcover, $29.80. 相似文献
4.
5.
7.
8.
9.
癌症目前通过手术切除、化学及放射治疗等方法所得到的治疗效果不一,而且多数的患者复发的机率很高,甚至死亡。因此许多研究学者致力于治疗癌症药物的开发,尤其在还没有很好的预防方法之前。据台湾生物医药信息网mdnews.itri.org.tw报道,最近美国的研究学者,从海参当中萃取出一种物质,这种化合物能够有效阻碍某些人类癌细胞的生长(其中包括胰脏癌)。Dr.Adrian是研究其中的翘楚,在超过十年的研究当中,发现胰脏癌细胞生长途径中一重要的物质Lipoxygenase(在大肠癌细胞生长中也发现相同的物质)。Adrian与一家致力于海洋药物开发的公司合作当中,发现原本被开发来当作抗发炎制剂的海参萃取物,对于癌细胞的生长发生有抑制的效果,能引发一种转变性的细胞死亡。虽然目前还未证实在人类的临床实验中是否会有同样的效果,但研究者表示有希望能得到预期的结果。□新发现:海参防癌@刘晓荻 相似文献
10.
11.
12.
13.
14.
自1912年德国年轻的气象学家魏格纳提出大陆漂移说后,在学术界曾持续论战20年之久。1930年,魏格纳在格陵兰探险中遇难身亡,论战才搁置起来。魏格纳的尸体是第二年夏天才被人找到的,他不是死于饥饿和寒冷,而是在他50岁生日那天,因心脏病发作而猝然离开人世的。人们把魏格纳埋葬在冰冷的荒原上。由于魏格纳的死,他提 相似文献
15.
Offshore fouling: investigation methods 总被引:2,自引:0,他引:2
On the hasis of the reason that the offshore oil development areas in the northem South China Sea are at greater depth, more hazardous conditions and distance from shore, the methods and technologies used in coastal waters are not feasible because of the higher risk of losing investigation equipment or facilities. A series of methods and technologies for offshore fouling investigation that have been successfully applied is given in detail and it is hoped that the experience can be helpful for further studies. 相似文献
16.
17.
2012年9月23日,中国首艘航母平台——16号舰在大连举行交船仪式,舰桥顶端升起五星红旗,舰艏升起八一军旗,舰艉升起海军旗。9月25日上午,中国首艘航空母舰"辽宁"号(原名"瓦良格"号)正式交接入列,标志着中国海军由此进入航母时代。从可能变为一堆废钢铁,到5个国家公开竞标,"瓦良格"投奔中国获得了新生。"辽宁"号航空母舰原为苏联海军建造的"瓦良格"号航 相似文献
18.
据《述异记》载,宋朝有个叫查道的人在航海时,见过一种鱼,他描述说“海上有妇人出现,红裳双祖,髻鬟纷乱”。其实,这就是文人笔下的“美人鱼”。其实,美人鱼并不美,它就 相似文献
19.
20.
《Marine Policy》1999,23(1):11-24
By 1 August 1998 Regulation I/7 of the 1995 amendments to the International Convention on Standards of Training, Certification and Watchkeeping for Seafarers (1978) requires a comprehensive submission of information to the International Maritime Organization supporting an Administration’s claim that it complies fully with, or is in the process of implementing, STCW ’95 via policy and legislative processes. Once the complete information is received by the International Maritime Organization, the Secretary-General must submit a report to this effect to the Maritime Safety Committee. Three questions emerging from this controversial provision in STCW ’95 are:
- •When, if ever, is the information from an Administration complete?
- •What is the time frame allocated for confirmation by the IMO Secretariat?
- •How does IMO assess whether the claim by an Administration is valid?