全文获取类型
收费全文 | 184篇 |
免费 | 4篇 |
国内免费 | 5篇 |
专业分类
安全科学 | 3篇 |
废物处理 | 10篇 |
环保管理 | 16篇 |
综合类 | 25篇 |
基础理论 | 40篇 |
环境理论 | 2篇 |
污染及防治 | 70篇 |
评价与监测 | 20篇 |
社会与环境 | 7篇 |
出版年
2022年 | 15篇 |
2021年 | 21篇 |
2020年 | 5篇 |
2019年 | 5篇 |
2018年 | 12篇 |
2017年 | 15篇 |
2016年 | 12篇 |
2015年 | 8篇 |
2014年 | 13篇 |
2013年 | 19篇 |
2012年 | 12篇 |
2011年 | 9篇 |
2010年 | 4篇 |
2009年 | 8篇 |
2008年 | 5篇 |
2007年 | 7篇 |
2006年 | 6篇 |
2005年 | 3篇 |
2004年 | 3篇 |
2003年 | 4篇 |
2002年 | 3篇 |
1998年 | 1篇 |
1994年 | 1篇 |
1983年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有193条查询结果,搜索用时 15 毫秒
151.
S.A. Edgerton X. Bian J.C. Doran J.D. Fast J.M. Hubbe E.L. Malone 《Journal of the Air & Waste Management Association (1995)》2013,63(10):1221-1229
ABSTRACT PM10, PM25, precursor gas, and upper-air meteorological measurements were taken in Mexico City, Mexico, from February 23 to March 22, 1997, to understand concentrations and chemical compositions of the city's particulate matter (PM). Average 24-hr PM10 concentrations over the period of study at the core sites in the city were 75 H g/m3. The 24-hr standard of 150 μ g/m3 was exceeded for seven samples taken during the study period; the maximum 24-hr concentration measured was 542 μ g/m3. Nearly half of the PM10 was composed of fugitive dust from roadways, construction, and bare land. About 50% of the PM10 consisted of PM2.5, with higher percentages during the morning hours. Organic and black carbon constituted up to half of the PM2.5. PM concentrations were highest during the early morning and after sunset, when the mixed layers were shallow. Meteorological measurements taken during the field campaign show that on most days air was transported out of the Mexico City basin during the afternoon with little day-to-day carryover. 相似文献
152.
Sabrina Portofino Antonio Donatelli Pierpaolo Iovane Carolina Innella Rocco Civita Maria Martino Domenico Antonio Matera Antonio Russo Giacinto Cornacchia Sergio Galvagno 《Waste management (New York, N.Y.)》2013,33(3):672-678
An experimental survey of waste tyre gasification with steam as oxidizing agent has been conducted in a continuous bench scale reactor, with the aim of studying the influence of the process temperature on the yield and the composition of the products; the tests have been performed at three different temperatures, in the range of 850–1000 °C, holding all the other operational parameters (pressure, carrier gas flow, solid residence time). The experimental results show that the process seems promising in view of obtaining a good quality syngas, indicating that a higher temperature results in a higher syngas production (86 wt%) and a lower char yield, due to an enhancement of the solid–gas phase reactions with the temperature. Higher temperatures clearly result in higher hydrogen concentrations: the hydrogen content rapidly increases, attaining values higher than 65% v/v, while methane and ethylene gradually decrease over the range of the temperatures; carbon monoxide and dioxide instead, after an initial increase, show a nearly constant concentration at 1000 °C. Furthermore, in regards to the elemental composition of the synthesis gas, as the temperature increases, the carbon content continuously decreases, while the oxygen content increases; the hydrogen, being the main component of the gas fraction and having a small atomic weight, is responsible for the progressive reduction of the gas density at higher temperature. 相似文献
153.
Márcio A.F. Martins Carolina A. Amaro Leonardo S. Souza Ricardo A. Kalid Asher Kiperstok 《Journal of Cleaner Production》2010,18(12):1184-1189
The promotion of a better rational use of water in industry requires an adequate knowledge of aqueous streams inside industrial plants. The main difficulty found in this respect is a lack of accurate measurement of such streams. In order to overcome this difficulty, a water balance tool with data reconciliation is used. This paper presents a method based on the idea that an estimated assumption can be made for any flow rate based on the best available information (quality of information). The quality of information is inversely proportional to the uncertainty of the estimated or measured flow rate and therefore there is a proportionality constant that relates these two. This paper demonstrates that the values of the proportionality constants in the real system are proximally the same for any stream. Furthermore, the proposed method has been applied to real systems with very poor measurement. This method enables the data reconciliation from water balances without data redundancy and without having to ignore flow rates with high levels of uncertainty. 相似文献
154.
Effects of urbanization on the population structure of freshwater turtles across the United States 下载免费PDF全文
David R. Bowne Bradley J. Cosentino Laurel J. Anderson Christopher P. Bloch Sandra Cooke Patrick W. Crumrine Jason Dallas Alexandra Doran Jerald J. Dosch Daniel L. Druckenbrod Richard D. Durtsche Danielle Garneau Kristen S. Genet Todd S. Fredericksen Peter A. Kish Mary Beth Kolozsvary Frank T. Kuserk Erin S. Lindquist Carol Mankiewicz James G. March Timothy J. Muir K. Greg Murray Madeline N. Santulli Frank J. Sicignano Peter D. Smallwood Rebecca A. Urban Kathy Winnett‐Murray Craig R. Zimmermann 《Conservation biology》2018,32(5):1150-1161
Landscape‐scale alterations that accompany urbanization may negatively affect the population structure of wildlife species such as freshwater turtles. Changes to nesting sites and higher mortality rates due to vehicular collisions and increased predator populations may particularly affect immature turtles and mature female turtles. We hypothesized that the proportions of adult female and immature turtles in a population will negatively correlate with landscape urbanization. As a collaborative effort of the Ecological Research as Education Network (EREN), we sampled freshwater turtle populations in 11 states across the central and eastern United States. Contrary to expectations, we found a significant positive relationship between proportions of mature female painted turtles (Chrysemys picta) and urbanization. We did not detect a relationship between urbanization and proportions of immature turtles. Urbanization may alter the thermal environment of nesting sites such that more females are produced as urbanization increases. Our approach of creating a collaborative network of scientists and students at undergraduate institutions proved valuable in terms of testing our hypothesis over a large spatial scale while also allowing students to gain hands‐on experience in conservation science. 相似文献
155.
de Vasconcelos Vera Mônica de Morais Elís Regina Costa Faustino Samantha Joyce Bezerra Hernandez Maria Carolina Ramirez Gaudêncio Hiara Ruth da Silva Câmara de Melo Rafael Rodolfo Bessa Junior Ambrósio Paula 《Environmental science and pollution research international》2021,28(3):2600-2607
Environmental Science and Pollution Research - Aquaculture is an activity with economic and social importance since it generates food, employment, and income. However, like other human activities,... 相似文献
156.
Joseph A. Adeyemi Chris O. Adedire Airton da Cunha Martins-Junior Ana Carolina Paulelli Akinsola F. Awopetu Fabiana Roberta Segura 《毒物与环境化学》2017,99(5-6):999-1006
This study determined concentrations and speciation of arsenic (As) in rice samples obtained from the cities of Akure, Ore, Ondo and Ikare in Ondo State, south-western Nigeria. The estimated dietary intake of As from rice consumption for total As and the identified As species were compared with the As benchmark dose lower confidence limit. Analyses of rice from the four cities identified three As species: inorganic As, monomethylarsonic, acid and dimethylarsinic acid. Concentrations of total As and the As species differed significantly across the sampling locations (by a factor of 2.5 for total As). Mean levels (±S.D.) were 58.8 ± 0.7 µg/kg total As, 47.0 ± 0.6 µg/kg inorganic As, 0.33 ± 0.03 µg/kg monomethylarsonic acid, and 11.5 ± 0.1 µg/kg dimethylarsinic acid. The estimated mean dietary intakes were 4.1 µg/d total As, 3.3 µg/d inorganic As, 0.02 µg/d monomethylarsonic acid, and 0.8 µg/d dimethylarsinic acid. These values are below the benchmark dose lower confidence limit and comparable to, or lower than, those reported for other countries. Thus, consumption of rice cultivated in south-western Nigeria does not appear to have inherent As-associated health risks. 相似文献
157.
The Use of Zero‐Valent Iron (ZVI) Technology to Promote DDT and Dieldrin Degradation at Point Pelee National Park 下载免费PDF全文
Point Pelee National Park (PPNP) is highly contaminated with dichlorodiphenyltrichloroethane (DDT) and dieldrin due to the historical use of these two persistent organochlorine pesticides. Zero‐valent iron (ZVI) technology with and without amendments has been successfully used in the past to promote organochlorine pesticides degradation in several locations in North America and Europe. In this study, the use of two commercially available ZVI products, DARAMEND® and EHC®, to promote DDT and dieldrin degradation in PPNP's soil and groundwater were investigated. DARAMEND® was applied to PPNP's soil in a laboratory experiment and in an in situ pilot‐scale plot. In both cases, DARAMEND® did not significantly increase DDT or dieldrin degradation in treated soils. The effectiveness of EHC® was tested in a laboratory experiment that simulated the park's groundwater environment using PPNP's pesticide contaminated soil. The result was consistent with the one reported for DARAMEND®, in that there was no significant increase in DDT or dieldrin degradation in any of the samples treated with EHC®. These results demonstrate that both of these ZVI commercially available products are not suitable for in situ remediation at PPNP. ©2017 Wiley Periodicals, Inc. 相似文献
158.
Kirsten A. Henderson Mateus Reis Carolina C. Blanco Valério D. Pillar Rodrigo C. Printes Chris T. Bauch Madhur Anand 《Sustainability Science》2016,11(2):321-330
The forest–grassland mosaics of southern Brazil have been subject to many land use and policy changes over the decades. Like many grasslands around the world, the Campos grasslands are declining with few conservation efforts underway. In contrast, forests receive much attention and many incentives. It is hypothesized that perception of land cover has the potential to shape ecosystems. Here we conduct a questionnaire to further our understanding of decision-making practices that alter landscapes (Campos grassland, Araucaria forest, agriculture and plantation) and direct land policies in the region. Our analysis reveals that plantations are significantly less desirable than the other landscape types. However, plantation land use has increased by 87 % over the past few decades, as a result of industry and government incentives. The proportions of other landscape types have remained consistent over the past two decades. Restoration of native vegetation is not a priority of landowners and restoration would require a financial incentive. 相似文献
159.
160.
Carolina Lourencetti Rodrigo Favoreto Mary R. R. Marchi Maria L. Ribeiro 《Journal of environmental science and health. Part. B》2013,48(6):697-705
Persistent organic pollutants (POPs), organochlorine pesticides and polychlorinated biphenyls (PCBs), listed as per the Stockholm Convention (α -HCH, β -HCH, γ -HCH, p,p′-DDT, o,p′-DDT, p,p′-DDD, p,p′-DDE, aldrin, endrin, dieldrin, PCBs 28, 52, 118, 138, 153, and 180), were analyzed in municipal solid waste (MSW) compost samples from three different Brazilian composting plants located in three São Paulo State cities: Araras, Araraquara and São Paulo (Vila Leopoldinha). Quantitative and qualitative analyses were carried out using gas chromatography electron capture detection (GC-ECD) and gas chromatography mass spectrometry (GC-MS) (Ion Trap, electron impact ionization), respectively. The samples were analyzed in triplicate and the target POPs were not detected by GC-ECD. Twelve pollutants were identified in two samples when qualitative analysis (GC-MS) was used (β -HCH, γ -HCH, p,p′-DDT, o,p′-DDT, p,p′-DDD, and p,p′-DDE, PCBs 28, 118, 138, 153 and 180). The composting process has advantages such as urban solid waste reduction and landfill life-span increase, however the MSW compost quality, which can be utilized for agricultural purposes, should be evaluated and be controlled. This kind of study is the first step in making available information to answer questions regarding MSW compost for sustainable agricultural use, such as the pollutants accumulation in soil and in groundwater, and plants uptake. 相似文献