全文获取类型
收费全文 | 57篇 |
免费 | 1篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 1篇 |
废物处理 | 3篇 |
环保管理 | 1篇 |
综合类 | 15篇 |
基础理论 | 14篇 |
污染及防治 | 16篇 |
评价与监测 | 4篇 |
社会与环境 | 4篇 |
灾害及防治 | 1篇 |
出版年
2022年 | 9篇 |
2021年 | 1篇 |
2020年 | 1篇 |
2017年 | 2篇 |
2016年 | 4篇 |
2015年 | 1篇 |
2014年 | 2篇 |
2013年 | 4篇 |
2012年 | 3篇 |
2011年 | 6篇 |
2010年 | 2篇 |
2009年 | 2篇 |
2008年 | 2篇 |
2007年 | 4篇 |
2004年 | 1篇 |
2003年 | 2篇 |
1999年 | 1篇 |
1990年 | 1篇 |
1977年 | 1篇 |
1966年 | 1篇 |
1964年 | 1篇 |
1963年 | 1篇 |
1962年 | 1篇 |
1961年 | 1篇 |
1960年 | 2篇 |
1959年 | 1篇 |
1958年 | 1篇 |
1940年 | 1篇 |
排序方式: 共有59条查询结果,搜索用时 31 毫秒
11.
Leonardo Lavanderos M. Eugenia Pozo Carlos Pattillo Hernán Miranda 《Environmental monitoring and assessment》1990,14(1):9-22
Spatial heterogeneity of the Rapel reservoir surface waters is analyzed through Landsat images. The image digital counts are used with the aim or developing an aprioristic quantitative sample design.Natural horizontal stratification of the Rapel Reservoir (Central Chile) is produced mainly by suspended solids. The spatial heterogeneity conditions of the reservoir for the Spring 86-Summer 87 period were determined by qualitative analysis and image processing of the MSS Landsat, bands 1 and 3. The space-time variations of the different observed strata obtained with multitemporal image analysis.A random stratified sample design (r.s.s.d) was developed, based on the digital counts statistical analysis. Strata population size as well as the average, variance and sampling size of the digital counts were obtained by the r.s.s.d method.Stratification determined by analysis of satellite images were later correlated with ground data. Though the stratification of the reservoir is constant over time, the shape and size of the strata varys. 相似文献
12.
13.
14.
15.
Thirteen surficial sediment samples, two sediment cores and mussels (Mytilus galloprovincialis) from six locations were collected from Thermaikos gulf, Greece and analyzed for herbicides, organochlorine compounds and aliphatic hydrocarbons. Herbicide concentrations were low in surface sediments (not detected‐0.8 ng/g dry wt) and undetectable in subsurface samples. Organochlorine concentrations ranged between 0.8 and 88.2 ng/g dry wt for the polychlorinated biphenyls (PCBs) and between 1.7 and 22.8 ng/g dry wt for the SDDTs, while aliphatic hydrocarbon values varied from 28.8 to 965.4 ng/g dry wt. The highest concentrations for all the pollutants were measured in the vicinity of the city of Thessaloniki. Petroleum‐related hydrocarbons were dominant in surface sediments, while were still detected till about 1 m depth in the sediment core. Mussels presented low organochlorine concentrations (3.6–10.5 ng/g dry wt for the PCBs, 12.2–34.0 ng/g dry wt for the DDTs), but petroleum hydrocarbon concentrations were rather increased, mainly in the samples collected along the east coastline of the gulf (aliphatic hydrocarbons 52.3–224.3 μg/g dry wt). 相似文献
16.
17.
18.
19.
Stelios Katsanevakis Maria Thessalou-Legaki Constantina Karlou-Riga Eugenia Lefkaditou Evagelos Dimitriou George Verriopoulos 《Marine Biology》2007,151(3):949-959
Allometric growth investigations are usually conducted by fitting the allometric model (L)
(y, x are morphometric characters and b the allometric exponent), which is quite simple both conceptually and mathematically, and its parameters are easy to estimate
by linear regression. However b is not necessarily constant and it may change either continuously or abruptly at specific breakpoints; thus, the simple L
model quite often fails to describe allometric growth successfully. In the current context, a better alternative is proposed,
based on Kullback–Leibler (K-L) information theory and multi-model inference (MMI). Allometric growth was investigated in
eight marine species: the bivalves Pecten jacobaeus and Pinna nobilis, the squids Todarodes sagittatus and Todaropsis eblanae, the crab Pachygrapsus marmoratus (females), the ghost shrimp Pestarella tyrrhena (males), and the fishes Trachurus trachurus and Sparus aurata. In each of the eight species, a pair of body parts was measured and the allometric growth of one body part in relation to
the other (reference dimension) was studied, by fitting five different candidate models including: the simple allometric model,
two models assuming that b changed continuously and two other assuming that b had a breakpoint. For each species, the ‘best’ model was selected by minimizing the small-sample, bias-corrected form of
the Akaike Information Criterion. To quantify the plausibility of each model, given the data and the set of five models, the
‘Akaike weight’ w
i
of each model was calculated; based on w
i
the average model was estimated for each case. MMI is beneficial, more robust, and may reveal more information than the classical
approach. As demonstrated with the given examples, estimation of b from the linear model, when it was not supported by the data, revealed some characteristic pitfalls, such as concluding positive
allometry when there is actually negative or vice versa, or reporting allometry when the data in reality support isometric
growth or vice versa. 相似文献
20.
Eugenia Naro-Maciel Brendan Reid Katherine E. Holmes Daniel R. Brumbaugh Meredith Martin Rob DeSalle 《Marine Biology》2011,158(9):2027-2041
To investigate population differentiation in a comparative and historical context, segments of the mitochondrial cytochrome
c oxidase subunit I gene and the control region were sequenced in Panulirus argus from nine sites along approximately 1,500 km of the Northern Caribbean Sea (n = 326) and analyzed with respect to available panulirid data. A mismatch analysis and Fu’s F
S test uncovered a signature of historical population expansion around the time of the Last Glacial Maximum. Significant population
structure was not detected in the area. The data supported a hypothesis of panmixia resulting from ongoing larval transport
by ocean currents and historical population expansion. Despite high intraspecific divergence levels at COI within Panulirus argus and several other Panulirus species, genetic species identification through DNA barcoding was feasible using either a modified distance threshold or
a character-based approach. 相似文献