灾难性地震作用下的城市反应及其重建的系统研究     

Kozin.  F 刘立强 《世界地震工程》1989,(1):59-68

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地理现象的可分割性质     

M.F.古德柴尔德  D.M.马克  林涛 《地理科学进展》1991,10(4):5-15

在过去几年里,分割的概念引起了人们的极大关注。其主要思想起源于地图数据研究,而且它的很多应用继续牵涉到空间现象。在对比例尺的答复、自相似和空间循环细分三个标题下,我们回顾了地理学与分割的关联。分割度大小为表现制图综合效果特性和评价以空间样本为预告对象所推出的数据表示提供了手段。分割表面自相似特性,使得它如同在地貌过程研究中开始的或不存在的假设景观一样有用。空间现象的广泛变化,据统计,在许多规模上被证明是自相似,使人想起了像地理范围那样的比例尺依存关系的重要性。在文章三分之一的篇幅里,循环细分被证明是导致用数字形式表示空间数据的新奇和有效方法,并成为空间组织常见模型的特征。我们断定,分割被作为考虑空间形式传统方法重要变化,同时,与其说是提供了空间现象新的和重要的规范与标准,倒不如说提供了以经验为根据的可证实模型。  相似文献   

遥感技术与美国的人口普查     

H.A.莫罗——琼斯  J.F.沃特金斯  林珲 《地理科学进展》1985,4(3):37-43

引言 D.布鲁金尼的论文《可用空间时代技术进行更精确的人口普查》提出了一些有趣的问题。我们为能够在《摄影测量工程和遥感》杂志上看到这篇有关遥感在社会科学领城内的应用的论文而高兴。我们认为只有了解人口普查数据的多种用途之后,再来检验那些改进人口普查的方法才是合适的,众所周知,每十年一次的人口普查数据的精度和完备性并不是没有缺点的。无疑地,许多人口普查人员将首先承认,每次由点数  相似文献   

Total content and chemical speciation of arsenic in the polychaete Sabella spallanzanii     

Fattorini D  Bocchetti R  Bompadre S  Regoli F 《Marine environmental research》2004,58(2-5):839-843

An unusual feature has been observed in polychaetes regarding their capacity to accumulate high levels of relatively toxic forms of arsenic in specific tissues. Basal levels of arsenic and distribution of its compounds were investigated in tissues of the Mediterranean polychaete Sabella spallanzanii. Particularly high concentrations were measured in the branchial crown (1036+/-136 microg/g d.w.) and chemical speciation revealed that the predominant form was the relatively toxic dimethylarsinate (DMA). These data suggest a potential role of As as anti-predatory strategy in polychaetes.  相似文献   

地中海下淹没洞穴堆积物中的贻贝记录了全新世海平面的上升：放射性碳…     

Anton.  F 陈秀澄 《海洋地质前沿》1997,(5):17-18

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A quantitative analysis on the Egyptian Mediterranean waters     

M. A. Sai  F. M. Eid 《海洋学报(英文版)》1994,13(2):203-212

ＡｑｕａｎｔｉｔａｔｉｖｅａｎａｌｙｓｉｓｏｎｔｈｅＥｇｙｐｔｉａｎＭｅｄｉｔｅｒｒａｎｅａｎｗａｔｅｒｓ￥Ｍ．Ａ．ＳａｉｄａｎｄＦ．Ｍ．Ｅｉｄ（ＲｅｃｅｉｖｅｄＳｅｐｔｅｍｂｅｒ２１，１９９３１ａｃｃｆｅｐｔｅｄＪａｎｕａｒｙ１５，１９９４）Ａｂｓ...  相似文献   

THE CLIMATIC CHANGES AND THE COASTAL ENVIRONMENT     

F. Marabini Qing YunshanA. Veggiani Gang Shuxi 《海洋地质与第四纪地质》1992,(1)

Although the Yellow River Delta and Bohai Sea coastal zone are long distance and different environment with Po River Delta and Adriatic Sea coastal zone, the comparison of data of two different areas and the evolution trend of two areas are quite similar. The influence of natural climatic changes on the evolution of the deltas and coastal zones exists both in ancient and modern times. The cold/wet period occurred in 1300—1400A. D. and 1550 —1850 A.D. within this"large scale" climatie cycle, and shorter periods (10— 35 years) of cold rainy weather alternated with warm/dry period are known as "Bruckner cycles" which have influence on the evolution of the deltas and coastal zones.  相似文献   

Assessing degradation capability of aerobic indigenous microflora in PAH-contaminated brackish sediments     

Abbondanzi F  Campisi T  Focanti M  Guerra R  Iacondini A 《Marine environmental research》2005,59(5):419-434

A study was conducted to determine polycyclic aromatic hydrocarbons (PAHs) distribution and microbial population changes in brackish sediments from an Italian lagoon included in the Ramsar List of Wetlands of International Importance. The presence and level of PAH-degrading bacteria were estimated by the most probable number (MPN) enumeration technique, whereas degradation capability towards target compounds was checked against loss of spiked PAHs (Phenanthrene, Anthracene and Fluoranthene) in MPN tubes after incubation in optimal conditions. Chemical analyses and microbiological counts suggested a potential for PAHs biodegradation by natural occurring populations of sediment microorganisms, thus indicating an "optimal range" in sediment PAHs concentrations, outside of which the natural selection of the indigenous microflora did not occur. The MPN procedure here described, provided an effective and reliable way to simultaneously determine microbial population densities and subsequent confirmation of the biodegradation capability of sediment indigenous microflora when exposed to laboratory and environmental concentrations of PAHs.  相似文献   

树脂纸板在牡蛎附苗与养成上的应用     

于业绍  王慧  王鲁民  胡萍  杨星星  关福田 《海洋科学》1995,19(2):13-14

１９８８～１９８９年，作者在山东省海阳县进行树脂涂料器材的采苗和养成筛选试验，取得了一定的效果。１９９０年，将海区试验移到了浙江省乐清湾进行，经过棚架式采苗和浮筏式养殖，附苗密度、生长速度，都能达到生产要求。１９９０年９月４日，对采苗情况进行验收，得到了专家及同行的好评。１９９１年扩大试验到１０００片，与橡皮条交叉分挂在同一棚架上采苗，然后移到同一浮筏上养成。养成期间，几次抽样检测，分别测量其密度和大小。１９９２年４月９日，委托专家和同行再次验收，以检测的结果，推算出一台筏架树脂纸板和一台筏架橡…  相似文献   

新一代智能数字测深仪     

周宏山  关致和  李一达  李胜全  赵先龙  邵海涛 《海洋测绘》2002,22(1):51-53

将计算机和高速DSP处理器引入测深仪，采用低噪声设计以获取高质量的回波，并通过高速DSP处理器实现了实时高精度测深和数据采集。通过功率可控发射机和大动态增益接收机实现了高质量信号的采集，通过全量程数据窗和高精度数据窗的独特设计，既保证了测深的搜索能力，又保证了测量精度，实现了测深控制的智能化。  相似文献