全文获取类型
收费全文 | 1711篇 |
免费 | 16篇 |
国内免费 | 9篇 |
专业分类
安全科学 | 46篇 |
废物处理 | 88篇 |
环保管理 | 167篇 |
综合类 | 177篇 |
基础理论 | 342篇 |
环境理论 | 4篇 |
污染及防治 | 625篇 |
评价与监测 | 171篇 |
社会与环境 | 111篇 |
灾害及防治 | 5篇 |
出版年
2023年 | 18篇 |
2022年 | 46篇 |
2021年 | 55篇 |
2020年 | 20篇 |
2019年 | 27篇 |
2018年 | 29篇 |
2017年 | 46篇 |
2016年 | 68篇 |
2015年 | 61篇 |
2014年 | 94篇 |
2013年 | 179篇 |
2012年 | 119篇 |
2011年 | 122篇 |
2010年 | 82篇 |
2009年 | 79篇 |
2008年 | 114篇 |
2007年 | 87篇 |
2006年 | 97篇 |
2005年 | 63篇 |
2004年 | 62篇 |
2003年 | 44篇 |
2002年 | 61篇 |
2001年 | 29篇 |
2000年 | 10篇 |
1999年 | 14篇 |
1998年 | 11篇 |
1997年 | 8篇 |
1996年 | 11篇 |
1995年 | 12篇 |
1994年 | 10篇 |
1993年 | 6篇 |
1992年 | 3篇 |
1991年 | 7篇 |
1990年 | 4篇 |
1989年 | 2篇 |
1986年 | 2篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1977年 | 2篇 |
1964年 | 6篇 |
1962年 | 1篇 |
1961年 | 1篇 |
1960年 | 1篇 |
1959年 | 3篇 |
1958年 | 2篇 |
1956年 | 1篇 |
1953年 | 1篇 |
1951年 | 1篇 |
1929年 | 1篇 |
1920年 | 2篇 |
排序方式: 共有1736条查询结果,搜索用时 15 毫秒
941.
Maria Virginia Petry Vanda Simone da Silva Fonseca Lucas Krüger-Garcia Roberta da Cruz Piuco Jaqueline Brummelhaus 《Marine Biology》2008,154(4):613-621
The coastline of the state of Rio Grande do Sul (Brazil) is used annually as a migratory route by a number of seabird species.
Thirteen surveys were carried out between July 1997 and July 1998 to obtain information on the diet of Puffinus gravis, Puffinus griseus, and Puffinus puffinus along the coast of Rio Grande do Sul. Sampling efforts focused on dead beach-cast specimens. One hundred twenty-one stomach
content analyses were performed on P. gravis from a total of 238 specimens; 17 stomach content analyses were performed on P. griseus from a total of 54 specimens; and 25 stomach content analyses were performed on 25 P. puffinus from a total of 61 dead specimens. Cephalopods were the main prey found in the stomachs of the three species and were present
in 96% of the P. gravis stomachs. The following cephalopods were observed: Ommastrephidae, Gonatus antarcticus, Gonatus sp., Lycoteuthis lorigera, Lycoteuthis sp., Histioteuthis sp., Cycloteuthis sp., Loligo plei, Loligo sanpaulensis, Sepiidae, and Argonauta nodosa. The latter was the most abundant species in the three species of Puffinus. The following fish were identified from otoliths: Porichthys porosissimus, Ctenosciaena gracilicirrhus, Paralonchurus brasiliensis, Cynoscion guatucupa, and Trichiurus lepturus. There was also a high incidence of synthetic materials such as plastic, polyethylene and rubber. 相似文献
942.
Fu-Lin Evelyn Chu Eric D. Lund Paul R. Littreal Kate E. Ruck Ellen Harvey Jean-René Le Coz Yanic Marty Jeanne Moal Philippe Soudant 《Marine Biology》2008,156(2):155-169
The kinetics and efficiency of sterol production and bioconversion of phytosterols in two heterotrophic protists Oxyrrhis marina and Gyrodinium dominans were examined by feeding them two different algal species (Rhodomonas salina and Dunaliella tertiolecta) differing in sterol profiles. R. salina contains predominantly brassicasterol (?99%) and <2% cholesterol. The major sterols in D. tertiolecta are ergosterol (45–49%), 7-dehydroporiferasterol (29–31%) and fungisterol (21–26%). O. marina fed R. salina metabolized dietary brassicasterol to produce 22-dehydrocholesterol and cholesterol. O. marina fed D. tertiolecta metabolized dietary sterols to produce cholesterol, 22-dehydrocholesterol, brassicasterol and stigmasterol. G. dominans fed either R. salina or D. tertiolecta metabolized dietary sterols to make cholesterol, brassicasterol and a series of unknown sterols. When protists were fed R. salina, which contains cholesterol, the levels of cholesterol were increased to a magnitude of nearly 5- to 30-fold at the phytoplankton-heterotrophic protist interface, equivalent to a production of 172.5 ± 16.2 and 987.7 ± 377.7 ng cholesterol per mg R. salina carbon consumed by O. marina and G. dominans, respectively. When protists were fed D. tertiolecta, which contains no cholesterol, a net production of cholesterol by the protists ranged from 123.2 ± 30.6 to 871.8 ± 130.8 ng per mg algal C consumed. Cholesterol is not only the dominant sterol, but a critical precursor for many physiologically functional biochemicals in higher animal. As intermediates, these heterotrophic protists increase the amount of cholesterol at the phytoplankton–zooplankton interface available to higher trophic levels relative to zooplankton feeding on algae directly. 相似文献
943.
Zooplankton community resilience after press-type anthropogenic stress in temporary ponds. 总被引:2,自引:0,他引:2
Temporary ponds are physically disturbed environments that fluctuate on seasonal and interannual scales. These ecosystems are also susceptible to anthropogenic perturbation such as contamination inputs. However, the interactive effects of natural disturbance and anthropogenic stress on ecosystem processes and community dynamics have hardly been assessed in these ecosystem types. We used a multiple before-after control-impact (MBACI) design to study zooplankton community recovery from low and high inputs of a fire retardant in artificially constructed ponds over three hydroperiods. The retardant caused a decline in species richness and an increase in rotifers during summer and winter months relative to controls and pretreatment dates, and the duration of these changes varied among retardant treatments. In nonmetric, multidimensional scaling analyses the increased rotifer densities were reflected in loops that showed recurring deviations from and (upon collapse) approaches to reference conditions, while the effects of the anthropogenic stressor persisted in the ponds. The amplitudes of fluctuation followed no regular patterns; it varied with retardant treatment level and was higher in the third hydroperiod compared to the second in one of the treatments. From a temporal perspective, this non-dampened pattern suggests a new cause-effect mechanism for disturbance ecology, which we refer to as a "protracted press disturbance, roller coaster response" relationship. This model emphasizes stochastic oscillations in community composition, punctuated by periods in which the community approaches reference conditions. From the applied viewpoint, this model suggests that the accurate detection of perturbation and the implementation of sound management and restoration strategies will require intensive sampling designs that span multiple hydroperiods in persistently degraded ponds. 相似文献
944.
Jean Vernin Hervé Trinquet George Jumper Edmund Murphy Anthony Ratkowski 《Environmental Fluid Mechanics》2007,7(5):371-382
Herein we present a campaign dedicated to the detection and the characterization of Gravity Waves (GW) in the Earth’s atmosphere
in relation to the generation of Optical Turbulence (OT). The observations took place in France from 17 to 24 July 2002 at
the Haute Provence Observatory (OHP) and simultaneously at the Sirene Observatory, some 20 km apart. From both sites, several
balloons were launched that measured the classical PTU-Wind profiles and additionally the structure constant of the temperature
field vertical profiles. A Generalized Scidar (GS) technique was implemented at the 1.93 m-diameter OHP telescope, providing profiles every minute. From our observations, a significant amount of GW activity was observed at both sites, but without
clear evidence of correlation between the two sites. It seems from our observations that a wide spectrum of GW is present
at a given altitude and that this could result in a lack of correlation between observations made from two sites 20 km apart.
Most GW are non-stationary with long horizontal wavelengths (λ ∼ 100–200 km), kilometric vertical wavelengths (λ ~ 0.5–2 km)
and long intrinsic period (T ~ 2–15 h). They belong in the category of “hydrostatic rotating or non-rotating waves”. Layers of optical turbulence detected
by balloons and the Scidar technique correlate well with regions of GW activity.
The U.S. Government’s right to retain a non-exclusive, royalty-free license in and to any copyright is acknowledged. 相似文献
945.
Gomes Luciano A. Gabriel Nuno Gando-Ferreira Licínio M. Góis José C. Quina Margarida J. 《Environmental science and pollution research international》2019,26(25):26000-26014
Environmental Science and Pollution Research - The application of sewage sludge (SS) in the soil can be a valuable way to increase its content of organic matter. However, the concentration of... 相似文献
946.
Gomes Marinna Lopes F. Prado Dayanne de Oliveira Correia Tamires Partélli Lyra Gustavo Bastos de Araújo Emanuel José Gomes Graham James Jim 《Environment, Development and Sustainability》2021,23(10):14436-14452
Environment, Development and Sustainability - In state of Rio de Janeiro, the Southeast Region of Brazil, 97.91% of the reforested areas contain exclusively species of Pinus and Eucalyptus. Due to... 相似文献
947.
de Sousa Paloma Viana Ferreira de Oliveira André Fernando da Silva Antônio Alberto Lopes Renata Pereira 《Environmental science and pollution research international》2019,26(15):14883-14903
Environmental Science and Pollution Research - Recent studies have shown Cu(0) as a promising material for the removal of organic and inorganic pollutants. However, there is no review addressing... 相似文献
948.
Camila Hendges Andréia da Paz Schiller Jéssica Manfrin Eurides Kuster Macedo Jr. Affonso C. Gonçalves Jr. José Renato Stangarlin 《Journal of environmental science and health. Part. B》2019,54(4):219-225
The objective of this study was to evaluate pesticide poisonings in the southern region of Brazil between years 1999 and 2014. Data were collected from the database Sinitox. Intoxications and deaths were evaluated according to the distribution by gender (female and male), age group (≤14, 15–59 and ≥60 years), area of occurrence (urban and rural), circumstance (accident, occupational and suicide attempt) and evolution of the cases over time (cure, unconfirmed cure, death and sequelae). In the evaluated period, 21,305 cases of intoxication were registered. The results show that males between the ages of 15 and 59 years are more affected; and there is a greater representativeness in the urban area. These results are related to the application of agrochemicals being carried out by individuals between 15 and 59 years of age. The great correlation of urban area possibly occurs in function of the air currents brought from the field and as a result, population has been more affected and the consumption of contaminated food. It was observed that women handling pesticides more cautiously, in this way the accidents with male gender are more frequent, however, many women use the product intentionally to provoke suicide. 相似文献
949.
Baragaño Diego Boente Carlos Rodríguez-Valdés Eduardo Fernández-Braña Alicia Jiménez Amalia Gallego José Luis R. González-Fernández Beatriz 《Environmental science and pollution research international》2020,27(10):10672-10684
Environmental Science and Pollution Research - Arsenic is a potentially toxic element of concern for environmental compartments, and it is a frequent pollutant in many abandoned industrial sites.... 相似文献
950.
Rodríguez Chialanza Mauricio Sierra Ignacio Pérez Parada Andrés Fornaro Laura 《Environmental science and pollution research international》2018,25(17):16767-16775
Environmental Science and Pollution Research - There are several techniques used to analyze microplastics. These are often based on a combination of visual and spectroscopic techniques. Here we... 相似文献