胶州湾海底地形地貌继承性的研究   总被引：3，自引：1，他引：3  

蔡龙宝  亓发庆 《海岸工程》1993,12(2):22-30

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超过例外氧暴露时限的空气巡回潜水实验中若干生理功能的观察     

陈宝松  荆岩林  郑继昌 《海洋科学》1991,15(1):35-39

17名潜水员安全地进行了55人次超过美国海军例外氧暴露时限1.5—3倍的空气巡回潜水实验。生理功能观察和肺活量测定结果表明,在水深70m以浅,潜水员均保持了相当好的智力和操作能力,在连续3d 3倍氧暴露时限的巡潜后期,只有3人肺活量下降,且在次日测定时已见恢复,表明上述暴露是安全的。美国海军例外氧暴露时限中对于70m以浅空气暴露的相应规定显得保守。  相似文献   

国产常用风杯风速表距离常数的测量和分析     

刘连吉 《山东海洋学院学报》1985,15(2):77-80

According to the tunnel test, distance constants of big, medium,small cup anemometers produced and used in our country, they are determined to be:Lbig c.a.=8.4m Lmedium c.a.=5.8m Lsmall c.a.=4.0m.  相似文献   

Genetic relationship between Neobenedenia girellae and N. melleni inferred from 28S rRNA sequences     

WANG Jun  ZHANG Wen  SU Yongquan  DING Shaoxiong 《海洋学报(英文版)》2004,23(4):709-716

The fragments of 350 bp in 28S rRNA from the closely related monogenea of trematoda, Neobenedenia girellae and N. melleni are obtained by polymerase chain reaction (PCR) amplified using a couple of special primers and then sequenced. The results show that the comparison of 28S rRNA sequences, with only a base varying in 337 bp accounting for 0.3% genetic difference, from the relative species N. girellae and N. melleni parasitized on the different fishes in different farms displays that they possess a very high genetic similarity of 99.7%, higher than that of 99.41% for the single species N. melleni sampled in different areas, and the intraspecific divergence of N.melleni is 0.59%. Meanwhile, the interspecific differences between the two Neobenedenia and three Benedenia (i.e., B. lutjani, B. rohdei and B. seriolae) range from 2.08% tol 1.73%. In addition, UPGMA and MP molecular phylogenetic trees are constructed and proved to be consistent with each other. Though the morphological characteristics and the results of genetic diversity for the two Neobenedenia show a high similarity, whether they belong to a single species or not are still undefined, and the more genes of them should be further investigated, in combination with the systematical and detailed morphological study.  相似文献   

上海洋山深水港建设与长江黄金水道发展前景研究          下载免费PDF全文

张耀光  殷艳  王丹  崔玉阁 《海洋开发与管理》2007,24(4):92-96

从世界上排名前15名的船公司对近20年来下水的船型进行分析后预测,到2010年,每船5600TEU以上,吃水14m的船型将达到55%～60%,到2020年将达到65%～70%。以目前航道水深为12.5m的美国纽约港为例,由于不能满足第五代集装箱船满载进出,其业务纷纷向加拿大哈利法克斯港分流。  相似文献   

我国虾类疾病研究情报源的分布     

胡俊荣  王安利 《海洋科学》2001,25(10):26-27

虾类疾病学情报作为一种情报资源 ,与水产科学研究的发展息息相关 ,它是虾类疾病研究人员进行创造性劳动的结果。同时也是虾病研究工作者借鉴利用并进行再研究工作的源泉。１５ａ来 ,我国虾病研究已开始从发病以后再研究防治方法的传统时代 ,转变为多方面提高养殖群体的免疫力和抵抗力的研究与管理阶段 ,以达到预防和减少疾病及降低所造成的危害与损失的目的。诊断方法已由看、摸、触发展为使用现代生物技术检测虾病 ,使其传统的学科界线不断被打破 ,学科的划分越来越细 ,学科之间的相互联系越来越密切。这样对虾类疾病学研究情报的要求越来…  相似文献   

基于K-L变换的多光谱图像增强方法     

李晨钊  蒲世超 《四川测绘》2008,31(1):14-16

为在多光谱图像增强同时保持其光谱特性,提出了基于K-L变换的多光谱图像增强方法,并在研究如何准确量化增强前后光谱保持度的基础上,提出了光谱特性保持系数的概念.实验结果表明,该方法在对多光谱图像增强的同时,能较好地保持多光谱图像的光谱特性.  相似文献   

ET0计算公式的最新进展与普适性评估   总被引：5，自引：3，他引：2       下载免费PDF全文

苏春宏  陈亚新  徐冰 《水科学进展》2008,19(1)

通过对ET0计算公式研究进展的总结,分析了在世界上三个时期比较有代表性的计算蒸发腾发量(ET0)的主要公式:修正Penman(MP)公式、Penman-Monteith(PM)公式及标准ASCE-PM公式;以20世纪90年代末期和21世纪初期世界上最新的19个用Lysimeter实验值率定ET0计算值的实验成果为基础,对于不同气候条件下ET0计算方法的普适性分析评估认为:虽PM公式应用效果较好的地区较多,但也有不少地区效果欠佳,MP等公式在一部分地区较好,PM与MP公式并非普适性的,要特别关注标准ASCE-PM公式,总之,这类半理论(半经验)公式均有一定的地区性.仅通过MP、PM公式的计算比较,不能简单地评定哪种公式最优或哪种公式计算ET0值大(或值小),应针对不同地理及气候条件,要经Lysimeter的实验结果才能进行率定比较.文中也对今后研究提出相应建议,有助于ET0计算公式学科的深入研究.  相似文献   

蒸发皿中水面蒸发氢氧同位素分馏的实验研究   总被引：3，自引：0，他引：3       下载免费PDF全文

包为民  胡海英  王涛  瞿思敏 《水科学进展》2008,19(6):780-785

气象要素与蒸发密切相关,通过室内外不同气象条件下的器皿水蒸发实验,获得了水面蒸发氢氧稳定同位素分馏因子与气象要素的关系。实验结果表明,随着蒸发的进行,剩余水体中逐渐富集重同位素;自由水体蒸发同位素分馏在垂线上有分层现象,表层水体同位素值比垂线平均的同位素值略富集;不同温度条件下的室内蒸发实验中,温度越高,液-气间分馏系数越小,相应于同一剩余水体体积比,剩余水体稳定同位素值则越低。室外器皿水自由蒸发实验中得出的蒸发线方程斜率较大地偏离了当地降水线,表明实验期间水体蒸发分馏作用较明显。该研究为进一步揭示水体蒸发分馏规律提供了可靠的实验依据。  相似文献   

Mechanism of Secondary Pore Formation and Prediction of Favorable Reservoir of Paleogene in Jiyang Sag,Eastern China     

Lü Xixue 《中国地质大学学报(英文版)》2008,19(6):675-684

Jiyang (济阳) sag is an oil rich basin,consisting of Huimin (惠民),Dongying (东营),Zhanhua (沾化),and Chezhen (车镇) depressions.The elastic rock of Paleogene has undergone early and middle diagenetic stages and now the main clastic reservoir is in the middle diagenetic stage.Primary and secondary pores are developed in Paleogene sandstone,the latter is generated from the dissolution of feldspar and calcite cement in rocks owing to the organic acid from the maturated source rock,but the materials dissolved are different in different depressions.The reservoir secondary pores of Dongying depression are generated from the dissolution of calcite cement,the ones of Zhanhua and Huimin depressions from the dissolution of feldspar,the secondary pores of Chezhen depression from the dissolution of feldspar in upper section,and the dissolution of calcite cement in the lower section of Paleogene,respectively.The secondary pores are developed in two depths and the depth goes down from west to east,from south to north in Jiyang sag.The major controlling factors for secondary pore development are maturity and location of source rock.Lastly,the favorable reservoirs are evaluated according to reservoir buried depth,sedimentation,and diagenesis.The reservoir with high quality is located in the northern and central parts in Dongying depression; there are some good reservoirs in Gndao (孤岛),Gudong (孤东),and Gunan (孤南) areas in Zhanhua depression,and the favorable reservoirs are located in the north steep slope and the south gentle slope of Chezhen depression and central uplift,south gentle slope of Huimin depression.  相似文献