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11.
Judith A. Zbinden Adrian Aebischer Dimitris Margaritoulis Raphaël Arlettaz 《Marine Biology》2008,153(5):899-906
Sea turtle populations worldwide suffer from reduced survival of immatures and adults due to fishery bycatch. Unfortunately,
information about the whereabouts of turtles outside the breeding habitat is scarce in most areas, hampering the development
of spatially explicit conservation plans. In the Mediterranean, recoveries of adult females flipper-tagged on nesting beaches
suggest that the Adriatic Sea and Gulf of Gabès are important foraging areas for adults, but such information could be heavily
biased (observing and reporting bias). In order to obtain unbiased data, we satellite-tracked seven loggerhead sea turtles
after they completed nesting in the largest known Mediterranean rookery (Bay of Laganas, Zakynthos, Greece). Three females
settled in the north Adriatic Sea, one in the south Adriatic Sea and two in the Gulf of Gabès area at the completion of their
post-nesting migrations (one individual did not occupy a distinct foraging area). The concordance of tracking results with
information from recoveries of flipper-tagged turtles suggests that the north Adriatic Sea and the Gulf of Gabès represent
key areas for female adult Mediterranean loggerhead sea turtles. 相似文献
12.
Moon DH Dermatas D Wazne M Sanchez AM Chrysochoou M Grubb DG 《Environmental geochemistry and health》2007,29(4):289-294
Several million tons of Chromite Ore Processing Residue (COPR) were deposited at two sites in New Jersey and Maryland, USA,
and over time they exhibited extensive heaving phenomena. Ettringite, a needle-shaped mineral and an expansive mineral commonly
recognized in the literature concerning cement- and soil, has been identified extensively in numerous COPR samples collected
from these sites. It was therefore believed that ettringite formation and its crystal growth are strongly associated with
COPR heaving. We investigated the correlation between ettringite and the heaving phenomena in COPR materials that contained
no initial ettringite. Two identical COPR samples were exposed to a 4% w/w sulfate solution (25°C, 50°C) in a confined swell
test apparatus. Both swell test samples were analyzed by means of X-ray powder diffraction. The peak intensities of newly
formed ettringite were more pronounced in the sample tested at 50°C, and swell development was only observed in this sample.
Scanning electron microscopy analyses revealed well-crystallized ettringite needles exceeding 40 μm in length for this sample,
while ettringite crystals less than 15 μm in length formed in the sample tested at 25°C. Therefore, the results suggest that
the quantity of ettringite and the extent of crystallization play a key role in the heave of COPR. 相似文献
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Dermatas D Dadachov M Mirabito M Meng X 《Journal of the Air & Waste Management Association (1995)》2003,53(11):1363-1372
Artificially contaminated (spiked) natural soils were solidified/stabilized using various combinations of commonly used additives, such as lime, cement, fly ash, activated carbon, and silica fume. The effectiveness of the solidification/stabilization (S/S) processes was evaluated based on experimental findings from compaction testing, unconfined compressive shear strength, and X-ray diffraction (XRD). Correlations of limited reliability between unconfined compressive strength and penetrometer and torvane measurements were derived. Results from XRD experiments indicated that certain organic contaminants (i.e., naphthalene and pyrene) might impact the S/S processes for a given combination of additives. The type and amount of organic contaminants also affected the pozzolanic reactions. Specifically, the absence or small peak intensity of pozzolanic product XRD patterns for a given combination of additives was a good indication that the type and the amount of organic contaminant present inhibited pozzolanic reactions. This phenomenon was tested and confirmed for actual field-contaminated samples. 相似文献
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Golfinopoulos SK Nikolaou AD Kostopoulou MN Xilourgidis NK Vagi MC Lekkas DT 《Chemosphere》2003,50(4):507-516
A survey undertaken in Northern Greece has shown that organochlorine pesticides are present in the surface waters. Surface water samples have been collected seasonally from four rivers and five lakes for a period of two years. Solid-phase extraction followed by gas chromatographic techniques with electron capture detection was used for the determination of the compounds. The most commonly encountered organochlorine pesticides in surface waters were the isomers of hexachlorocyclohexane, aldrin, dieldrin and endosulfan sulfate. In some cases the concentrations detected were higher than the qualitative target levels set by the European Union, especially for hexachlorocyclohexane and aldrin. The occurrence of these compounds in Greek surface waters can be attributed to intense agricultural activity as well as to transboundary pollution. 相似文献
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