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91.
Some recent simulations using a model given in a previous paper are presented. The model includes the phosphorus, algae and zooplankton levels in each of three layers of a lake: i.e., in the epilimnion, in the hypolimnion, and in sediment. Special emphasis is laid on testing the sediment submodel. Comparison with laboratory exoperiments conducted by Tessenow gives good agreement. The effects of some parameter variations are discussed. 相似文献
92.
93.
Lucie Bláhová Pavel Babica Ondřej Adamovský Jiří Kohoutek Blahoslav Maršálek Luděk Bláha 《Environmental Chemistry Letters》2008,6(4):223-227
Massive cyanobacterial water blooms and production of toxins (cyanotoxins) have become a worldwide problem. In this report,
we present results of cyanotoxins analyses (peptide microcystins, alkaloid cylindrospermopsin) in the Czech Republic reservoirs
using HPLC-PDA and ELISA. Our study suggests the occurrence of cylindrospermopsin in the Czech Republic for the first time
(particularly, in water blooms containing Aphanizomenon klebahnii). We also discuss human health risks associated with microcystins in relation to the drinking water guideline value of 1.0 μg/l
as recommended by the World Health Organization. 相似文献
94.
Vondráčková Stanislava Tlustoš Pavel Száková Jiřina 《Environmental science and pollution research international》2017,24(23):19201-19210
Environmental Science and Pollution Research - Willows (Salix spp.) are considered to be effective for the phytoremediation of trace elements from contaminated soils, but their efficiency is... 相似文献
95.
Pavel Dřímal Josef Hrnčiřík Jaromír Hoffmann 《Journal of Polymers and the Environment》2006,14(3):309-316
Testing biodegradability of plastics under varied conditions of the environment as well as under laboratory conditions in accordance with valid international standards is very laborious, lengthy and often also economically demanding. For this reason, applicability was verified of gas chromatography to analyze gaseous phase when investigating the biodegradation course of plastics in an aqueous environment as an alternative to customary employed methods. A mathematical model of acid–basic CO2 equilibrium in a gas–liquid system was worked out, enabling to determine quantity of produced CO2 through chromatographic analysis of gaseous phase, in dependence on ratio of liquid and gas phase volumes (V
l/V
g) and on actual pH of liquid phase. Experimental conditions for organizing the tests were optimized. A ratio that proved suitable was V
l/V
g ≅ 0.1 at pH ≈ 7.1 of liquid phase. Under these test conditions, biodegradability of model samples, PHB, Gellan gum and Xanthan gum, was explored; course of biodegradation was studied through produced CO2 (values
) determined by analyzing gaseous phase through gas chromatography on the one hand, and through customary “titration” procedure on the other. With water-soluble polymers, the decrement in dissolved organic carbon (values D
DOC) was also studied. Difference between values does not exceed 5%. The procedures in question are alternative “substituting” procedures for observing course of aerobic biodegradation of substances in an aqueous environment. 相似文献
96.
Sıdıka Tekeli‐Yeşil Necati Dedeoǧlu Marcel Tanner Charlotte Braun‐Fahrlaender Birgit Obrist 《Disasters》2010,34(4):910-930
This study investigated the process of taking action to mitigate damage and prepare for an earthquake at the individual level. Its specific aim was to identify the factors that promote or inhibit individuals in this process. The study was conducted in Istanbul, Turkey—where an earthquake is expected soon—in May and June 2006 using qualitative methods. Within our conceptual framework, three different patterns emerged among the study subjects. Outcome expectancy, helplessness, a low socioeconomic level, a culture of negligence, a lack of trust, onset time/poor predictability, and normalisation bias inhibit individuals in this process, while location, direct personal experience, a higher education level, and social interaction promote them. Drawing on these findings, the paper details key points for better disaster communication, including whom to mobilise to reach target populations, such as individuals with direct earthquake experience and women. 相似文献
97.
This paper reviews the utilisation of waste as an alternative fuel, commonly referred to as Waste-to-Energy (WTE). The paper contains a comprehensive survey of the literature published in this field with comparative analysis of different approaches and methods. The main features and properties of municipal and industrial waste have been analysed as these can vary significantly from location to location and year to year. The paper discusses the applicability and limitations of current and developing WTE technologies as well as new and emerging WTE technologies and the recent developments in design of for producing heat, power and fuels. Methodologies that are considered include criteria for technology selection, together with procedures that comply with the environmental EC regulations Best Available and Best Applicable Techniques (BREFs). 相似文献
98.
Hlásny Tomáš Trombik Jiří Dobor Laura Barcza Zoltán Barka Ivan 《Regional Environmental Change》2016,16(5):1495-1506
Regional Environmental Change - The Carpathians are the largest European mountain range and harbour exceptional biodiversity. However, recent and anticipated changes in climate along with rapid... 相似文献
99.
Eva Čadková Michael Komárek Regina Kaliszová Jiřina Száková Aleš Vaněk François Bordas Jean-Claude Bollinger 《Environmental science and pollution research international》2013,20(6):4205-4215
The aim of this study is to investigate how the presence of Cu influences tebuconazole (Teb) sorption onto contrasting soil types and two important constituents of the soil sorption complex: hydrated Fe oxide and humic substances. Tebuconazole was used in commercial form and as an analytical-grade chemical at different Teb/Cu molar ratios (1:4, 1:1, 4:1, and Teb alone). Increased Cu concentrations had a positive effect on tebuconazole sorption onto most soils and humic substances, probably as a result of Cu?Teb tertiary complexes on the soil surfaces. Tebuconazole sorption increased in the following order of different Teb/Cu ratios 1:4?>?1:1?>?4:1?>?without Cu addition, with the only exception for the Leptosol and ferrihydrite. The highest K f value was observed for humic substances followed by ferrihydrite, the Cambisol, the Arenosol, and the Leptosol. The sorption of analytical-grade tebuconazole onto all matrices was lower, but the addition of Cu supported again tebuconazole sorption. The Teb/Cu ratio with the highest Cu addition (1:4) exhibited the highest K f values in all matrices with the exception of ferrihydrite. The differences in tebuconazole sorption can be attributed to the additives present in the commercial product. This work proved the importance of soil characteristics and composition of the commercially available pesticides together with the presence of Cu on the behavior of tebuconazole in soils. 相似文献
100.
Sisr L Mihaljevic M Ettler V Strnad L Sebek O 《Environmental monitoring and assessment》2007,135(1-3):465-473
The mobility of arsenic in Cambisol under the influence of added barnyard manure and application of a phosphate solution to
the soil was described on the basis of column experiments. A soil sample containing 126 mg/kg total As and 3.72 mg/kg specifically-sorbed
As was extracted using demineralized water (DIW) or a 28 μmol/l phosphate solution in a column containing untreated soil and
in a column with added barnyard fertilizer. The pH, Eh, alkalinity, main components, including DOC, and selected trace elements
(Al, Mn, Pb, Cu, Zn, Cd, Cr, Co, Ni, Ba and As) were determined in the extracts. Hydrodynamic tests of the flow and transport
of the substances in the columns were carried out. The addition of barnyard manure was manifested in elevated concentrations
of the main inorganic components, DOC and Al and a decrease in the Eh value and Mn concentration. Application of a phosphate
solution was manifested in a decrease in the NO3 and SO4 concentrations, probably as a result of the effect of increased biological fixation. The As concentration in extracts varied
from 8.8 to 15.5 μg/l and was not dependent on the composition of the extracting solution or the addition of barnyard fertilizer. 相似文献