全文获取类型
收费全文 | 2068篇 |
免费 | 18篇 |
国内免费 | 14篇 |
专业分类
安全科学 | 56篇 |
废物处理 | 116篇 |
环保管理 | 204篇 |
综合类 | 211篇 |
基础理论 | 399篇 |
环境理论 | 3篇 |
污染及防治 | 751篇 |
评价与监测 | 198篇 |
社会与环境 | 155篇 |
灾害及防治 | 7篇 |
出版年
2023年 | 19篇 |
2022年 | 56篇 |
2021年 | 70篇 |
2020年 | 27篇 |
2019年 | 27篇 |
2018年 | 52篇 |
2017年 | 63篇 |
2016年 | 96篇 |
2015年 | 63篇 |
2014年 | 105篇 |
2013年 | 189篇 |
2012年 | 141篇 |
2011年 | 160篇 |
2010年 | 88篇 |
2009年 | 114篇 |
2008年 | 130篇 |
2007年 | 119篇 |
2006年 | 105篇 |
2005年 | 82篇 |
2004年 | 69篇 |
2003年 | 63篇 |
2002年 | 78篇 |
2001年 | 31篇 |
2000年 | 17篇 |
1999年 | 12篇 |
1998年 | 16篇 |
1997年 | 9篇 |
1996年 | 14篇 |
1995年 | 14篇 |
1994年 | 14篇 |
1993年 | 8篇 |
1992年 | 5篇 |
1991年 | 4篇 |
1990年 | 5篇 |
1989年 | 2篇 |
1986年 | 2篇 |
1984年 | 2篇 |
1983年 | 5篇 |
1982年 | 3篇 |
1981年 | 2篇 |
1977年 | 2篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1973年 | 2篇 |
1966年 | 1篇 |
1965年 | 3篇 |
1964年 | 1篇 |
1963年 | 1篇 |
1958年 | 2篇 |
1956年 | 1篇 |
排序方式: 共有2100条查询结果,搜索用时 15 毫秒
21.
22.
Rosa Cartolano Silvana Guerneri Roberto Fogliani Andrea Galimberti Umberto Nicolini 《黑龙江环境通报》1993,13(11):1057-1059
Trisomy 12 mosaicism diagnosed at 16 weeks' amniocentesis in a 42-year-old woman was not confirmed at 18 weeks' gestational age in amniotic fluid or fetal blood. Fetal skin biopsy performed at the same time did, however, allow the detection of trisomy 12 in 1 of 14 fibroblasts analysed. Fetal skin biopsy can be included within the diagnostic procedures to be performed when a level III mosaicism is found in the amniotic fluid. 相似文献
23.
Nada Horvatinčić José Luis Briansó Bogomil Obelić Jadranka Barešić Ines Krajcar Bronić 《Water, Air, & Soil Pollution: Focus》2006,6(5-6):475-485
The process of eutrophication in form of intense plant growth has been observed in some lakes and water streams at the Plitvice
Lakes National Park in central Croatia. Here we investigate whether this phenomenon is a consequence of anthropogenic pollution
or due to naturally produced organic matter in the lakes. We applied chemical analysis of water at two springs and four lakes
(nutrients, dissolved organic carbon (DOC), trace elements) and measurements of surface lake sediments (mineral and organic
fraction analyses, trace elements) in four different lakes/five sites. The chemical composition of water does not indicate
recent anthropogenic pollution of water because the concentrations of most trace elements are below detection limits. The
concentrations of DOC and nutrients are slightly higher in the area of increased eutrophication-plant growth. Also the content
of organic matter in the sediment is at the highest level in areas with highest C/N ratio indicating that the organic fraction of this sediment is mainly of terrestrial origin. There is no significant difference
among the trace element concentration in the upper segment of all cores, deposited approximately during last 50 years when
higher anthropogenic influence is expected due to development and touristic activity, and the lower part of the cores, corresponding
to the period approximately 100–200 years before present. The content of trace elements and organic matter in sediments decreases
from the uppermost lake downstream. According to our results there is no indication of recent anthropogenic pollution in water
and sediment. Higher concentrations of DOC in water as well as phosphorus and some other elements in the lake sediment can
be a consequence of input of natural organic matter to the lake water. 相似文献
24.
The East Usambara Mountains, recognized as one of the 25 most important biodiversity hot spots in the world, have a high degree
of species diversity and endemism that is threatened by increasing human pressure on resources. Traditional slash and burn
cultivation in the area is no longer sustainable. However, it is possible to maintain land productivity, decrease land degradation,
and improve rural people’s livelihood by ameliorating cultivation methods. Improved agroforestry seems to be a very convincing
and suitable method for buffer zones of conservation areas. Farmers could receive a reasonable net income from their farm
with little investment in terms of time, capital, and labor. By increasing the diversity and production of already existing
cultivations, the pressure on natural forests can be diminished. The present study shows a significant gap between traditional
cultivation methods and improved agroforestry systems in socio-economic terms. Improved agroforestry systems provide approximately
double income per capita in comparison to traditional methods. More intensified cash crop cultivation in the highlands of
the East Usambara also results in double income compared to that in the lowlands. However, people are sensitive to risks of
changing farming practices. Encouraging farmers to apply better land management and practice sustainable cultivation of cash
crops in combination with multipurpose trees would be relevant in improving their economic situation in the relatively short
term. The markets of most cash crops are already available. Improved agroforestry methods could ameliorate the living conditions
of the local population and protect the natural reserves from human disturbance. 相似文献
25.
Germano L. D. Leite Paula D. de Paulo José C. Zanuncio Anarelly C. Alvarenga Luan R. Dourado 《Journal of environmental science and health. Part. B》2017,52(1):70-76
Selective agrochemicals including herbicides that do not affect non-target organisms such as natural enemies are important in the integrated pest management (IPM) programs. The aim of this study was to evaluate the herbicide toxicity, selectivity and hormesis of nicosulfuron, recommended for the corn Zea mays L. (Poaceae) crop, on 10 Trichogrammatidae (Hymenoptera) species. A female of each Trichogramma spp. or Trichogrammatoidea annulata De Santis, 1972 was individually placed in plastic test tubes (no choice) with a cardboard containing 45 flour moth Anagasta ( = Ephestia) kuehniella Zeller, 1879 (Lepidoptera: Pyralidae) eggs. Parasitism by these natural enemies was allowed for 48 h and the cardboards were sprayed with the herbicide nicosulfuron at 1.50 L.ha?1, along with the control (only distilled water). Nicosulfuron reduced the emergence rate of Trichogramma bruni Nagaraja, 1983 females, but increased that of Trichogramma pretiosum Riley, 1879, Trichogramma acacioi Brun, Moraes and Smith, 1984 and T. annulata females. Conversely, this herbicide increased the emergence rate of Trichogramma brasiliensis Ashmead, 1904, T. bruni, Trichogramma galloi Zucchi, 1988 and Trichogramma soaresi Nagaraja, 1983 males and decreased those of T. acacioi, Trichogramma atopovilia Oatman and Platner, 1983 and T. pretiosum males. In addition, nicosulfuron reduced the sex ratio of T. galloi, Trichogramma bennetti Nagaraja and Nagarkatti, 1973 and T. pretiosum and increased that of T. acacioi, T. bruni, T. annulata, Trichogramma demoraesi Nagaraja, 1983, T. soaresi and T. brasiliensis. The herbicide nicosulfuron was “harmless” (class 1, <30% reduction) for females and the sex ratio of all Trichogrammatidae species based on the International Organization for Biological Control (IOBC) classification. The possible hormesis effect of nicosulfuron on Trichogrammatidae species and on the bacterium Wolbachia sp. (Rickettsiales: Rickettsiaceae) was also discussed. 相似文献
26.
Rose Emília Queiroz José Guerreiro Maria Anunciação Ventura 《Environment, Development and Sustainability》2014,16(5):1119-1135
In general, tourism plays a significant role in the economy of archipelagos and islands. The Autonomous Region of the Azores has a great potential for tourism, offering multiple attractions, both natural and cultural, creating a big challenge for a sustainable tourism policy since little attention has been paid to the archipelagos and their special needs. This work aims to understand the profile and type of ecotourist that visits the Azores. This knowledge is of great importance for a better management and development of nature-based tourism, and products tailored to the needs and expectations of visitors. The data were collected by means of exit surveys conducted at the Airport of São Miguel Island, the larger and most populated island of the archipelago, during the high tourist season—July–September 2009. The analysis of the visitor’s profile and preferences is crucial to draw adequate strategies of management for tourism, while it helps to adequate the offer to the demand. Results showed that 41.1 % of the tourists claimed to be attracted to the islands due to their “natural values” (e.g., landscape, biodiversity, and geodiversity). The most practiced activities were whale-watching (32.4 %) and mountaineering/hiking (31.6 %), followed by diving (7 %) and other sports (5.1 %). The tourists’ profile points to a mainstream, soft, and incidental type of ecotourist. This information helps to develop and support a strategic planning and management, both at local and regional levels, for sustainable tourism policies. 相似文献
27.
Atiaga Oliva Nunes Luis M. Otero Xosé L. 《Environmental science and pollution research international》2020,27(10):10757-10765
Environmental Science and Pollution Research - This study assessed the effect of rinsing and boiling on total content of As (tAs) and of its inorganic and organic forms in different types of rice... 相似文献
28.
Victor E. Balderas-Hernández José T. Ornelas-Salas Ana P. Barba de la Rosa 《Journal of environmental science and health. Part. B》2020,55(2):148-154
AbstractThe presence of diethyl-phthalate (DEP), dibutyl-phthalate (DBP), butylbenzyl-phthalate (BBP), diethylhexyl-phthalate (DEHP) and diisononyl-phthalate (DINP) was determined in 295 tequila samples. They were grouped by age of maturation (white, aged, extra aged or ultra aged) and year of production (between 2013 and 2018). Gas Chromatography coupled with Mass Spectrometry was used for identification and quantification. The results showed that 65 samples (22% of the total) were phthalate free. DEP (0.13-0.27?mg/kg), BBP (0.05–2.91?mg/kg) and DINP (1.64–3.43?mg/kg) were detected in 11 (3.73%), 37 (12.54%) and 5 (1.69%) samples, respectively. But, these concentrations did not exceed the maximum permitted limits (MPL) of phthalates for alcoholic beverages. DBP (0.01–2.20?mg/kg) and DEHP (0.03–4.64?mg/kg) were detected in 96 (32.54%) and 224 (75.93%) samples, from them only 10 (3.39%) and 15 (5.08%) samples, respectively, exceeded the MPL for alcoholic beverages and they were few tequilas produced in the year 2014 or before. DEHP was the most frequent phthalate found in tequila and observed DEHP concentrations were 2-times higher in ultra aged tequilas compared to those in white tequilas. We concluded that all tequilas produced in 2015 and after, satisfied the international standards for these compounds. 相似文献
29.
Raiane Costa Souza Roberto Bagattini Portella Paula Valéria Nunes Brito Almeida Caroline Oliveira Pinto Priscila Gubert 《Journal of environmental science and health. Part. B》2020,55(6):530-538
AbstractOrganochlorine pesticides (OCPs) are widely used around the world as insecticides, herbicides, fungicides, nematicides, and rodenticides. Despite banned in Brazil, the usage remains occurring in many countries. The persistence and extreme mobility of OCPs contribute to the contamination of the environment and the human body. The OCPs bioaccumulation in adipose tissue triggers the excretion into human milk during breastfeeding. Hence, the present study determined eighteen OCPs residues in the breast milk of mothers from the Western Region of Bahia State, Brazil. Nine different residue species were found, including beta-Hexachlorocyclohexane (9.24?±?0.00?ng g?1 fat), delta- Hexachlorocyclohexane (22.15?±?10.48?ng g?1 fat), Heptachlor (58.08?±?74.13?ng g?1 fat), Aldrin (142.65?±?50.65?ng g?1 fat), Dieldrin (774.62?±?472.68?ng g?1 fat), Endosulfan I (408.44?±?245.51?ng g?1 fat), Dichloro-diphenyl-dichloro-ethylene (29.17?±?22.42?ng g?1 fat), Dichloro-diphenyl-trichloro-ethane (28.87?±?0.00?ng g?1 fat) and Methoxychlor (1699.67?±?797.43?ng g?1 fat). The Methoxychlor presence in all samples may reveal a recent exposure, while Dieldrin and Endosulfan I analyses can point to distant past exposure. 相似文献
30.
Ana María Plata-Díaz José Luis Zafra-Gómez Gemma Pérez-López Antonio Manuel López-Hernández 《Waste management (New York, N.Y.)》2014,34(11):1967-1976
Identifying and characterising the factors that determine why a local authority opts for a particular way of managing its waste collection service is an important issue, warranting research interest in the field of municipal solid waste (MSW) management. This paper presents empirical evidence spanning a broad time horizon (2002–2010) showing that economic and political factors impact in different ways on the provision of waste management services. We examine five alternatives in this area, including public and private service delivery formulas and, within each field, individual and joint options. Our findings highlight the importance of the service cost and that of the various indicators of fiscal stress as determinant factors of management decisions regarding the provision of MSW management services. 相似文献