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排序方式: 共有172条查询结果,搜索用时 15 毫秒
161.
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Kolesarova A Capcarova M Arpasova H Kalafova A Massanyi P Lukac N Kovacik J Schneidgenova M 《Journal of environmental science and health. Part. B》2008,43(7):625-632
The purpose of this study was to determine certain blood biochemical parameters in hens of Isa Brown breed (n = 20) after nickel administration. Animals were divided into four groups (K, P1, P2, P3). Experimental hens (n = 5; in each group) received nickel (NiCl2) as peroral administration in drinking water in various doses (P1 - 0.02 g NiCl2/L; P2 - 0.2 g NiCl2/L; P3 - 2.0 g NiCl2/L of drinking water) for 28 days. The last group - K (n = 5) was the control, receiving no nickel. Biochemical parameters of mineral profile (calcium; phosphorus; magnesium; sodium; potassium) and of energy and enzymatic profile [(glucose; total cholesterol; total proteins; triglycerides; alanine aminotransferase (ALT) aspartate aminotransferase (AST) gamma glutamyl transferase (GGT) and glutamatdehydrogenase (GLDH)] were analyzed in blood serum on Day 0, 7, 14, 21 and 28 of the experiment. Average levels of mineral metabolism parameters were relatively stable apart from calcium. The evaluation registered a significant decrease in calcium during the experiment mainly in the group with highest nickel concentration in drinking water. No significant differences were detected between groups in energy and enzymatic profile apart from the concentrations of ALT on Day 7. In conclusion, there were significant associations between nickel levels and calcium and ALT in blood serum of the hens. No significant differences were detected in other biochemical parameters of mineral profile (P, Mg, Na, K) and energy and enzymatic profile (glucose, total cholesterol, total proteins, triglycerides, AST, GGT and GLDH) after nickel administration. Our results may contribute to an evaluation of reference levels of analyzed parameters, to monitor the health and nutritional status of hens. In this study also the negative effect of nickel mainly on calcium metabolism was detected. 相似文献
164.
Norbert Dee Gary Stacey John Bowman Syed Qasim 《Journal of the American Water Resources Association》1972,8(3):473-482
ABSTRACT A financing program for the prevention, control, and abatement of mine drainage pollution was developed using Appalachia as a case example. The financing program was selected by using three performance criteria in a screening process-applicability of financing program to pollution problem, feasibility of program to unit costs and capturing potential benefits, and feasibility of program to economic and legal consideration. Effluent charges with some modifications are suggested as the appropriate financing mechanism. 相似文献
165.
166.
Norbert P. Psuty M. Luisa Martínez Jorge López-Portillo Tanya M. Silveira José G. García-Franco Natalia A. Rodríguez 《Journal of Coastal Conservation》2009,13(2-3):77-87
The habitats of La Mancha Lagoon, located midway along the coast of Veracruz, Mexico, are responding to the change of sediment supply reaching its primary inlet at the Gulf of Mexico. Until several decades ago, an abundant alongshore supply of sediment created a periodic opening and closing of the La Mancha inlet. The hydrologic regime of the lagoon consisted of raised water level and lower salinity during the closures, whereas the open inlet favored lower water level, higher salinity, and sediment accumulation in the flood tidal delta. Currently, diminished alongshore sediment supply has affected the inlet morphology and the discharge regime. Associated with the reduced sediment supply, the inlet is open longer in its periodic cycle, the water level variation is reduced, the salinity contrasts are reduced, and the rate of sedimentation in the flood-tide delta is increased. This combination of alterations to the inlet area is changing the flooding regime and affecting the conditions in a very well-developed mangrove habitat at the lagoon margins as well as conditions within the aqueous portions of the lagoon. Management options produce a conflict between supporting the direction of change or preserving the existing habitats. 相似文献
167.
168.
A comparison of predicted and measured levels of runoff-related pesticide concentrations in small lowland streams on a landscape level 总被引:1,自引:0,他引:1
Short-term pollution events via runoff are typical of streams in agricultural areas. Existing runoff models that simulate pesticide loss from agricultural fields require extensive input of information. There is thus a need for a simple model that can predict runoff-related pesticide concentrations in many streams on a landscape level when only limited data are available. To validate such a model, the runoff-related pesticide load of 18 small lowland streams was predicted with an extended version of the model "simplified formula for indirect loadings caused by runoff" (available from the Organisation for Economic Cooperation and Development, OECD). The authors suggest that the model presented here is suitable for use in routine exposure assessment of pesticides on a landscape level, as all input data (soil, slope, precipitation, pesticide application) are readily available from public authorities or could be generated by simple regional flood hydrograph curves. The predicted concentrations were compared with measured concentrations obtained by runoff-triggered sampling. Fungicides, insecticides and herbicides were detected in 17 streams, with max. concentrations measuring up to 29.7 microg/l for the fungicide azoxystrobin and 0.3 microg/l for the insecticide parathion-ethyl. Herbicides were detected in 16 streams, with max. concentrations between 13.7 and 1.2 microg/l. The linear regression between the predicted and measured concentrations (log-values) shows significant correlations for the following pesticides: azoxystrobin: r2=0.43; p=0.03; epoxiconazole: r2=0.71; por=0.5 microg/l). 相似文献
169.
170.
Ellen McCoy Norbert Syska Martin Plath Ingo Schlupp Rüdiger Riesch 《Behavioral ecology and sociobiology》2011,65(7):1437-1445
One possible mechanism for the (co-)evolution of seemingly novel male traits and female preferences for them is that males
exploit pre-existing female biases, and livebearing fishes (Poeciliidae) have been at the forefront of this research for almost
two decades. Here, using 13 poeciliid species from four different genera, we tested whether mustache-like rostral filaments
found in males of some Mexican molly (Poecilia sphenops) populations could have evolved due to exploitation of a pre-existing female bias. While Mexican mollies were the only species
with a significant female association preference for mustached males, we also did not find any species exhibiting significant
aversion for mustached males; rather, variance in female preference scores was large throughout. For example, more than 25%
of females spent twice as much time with the mustached male compared to the non-mustached male in most species, but even 31%
of Mexican molly females spent more time near the non-mustached male. Hence, a comparison of the strength of preference was
inconclusive. We discuss the possibility that the female preference of P. sphenops for mustached males could be due to a female pre-existing bias (sensu lato), even if population means were not significant
for species other than P. sphenops. This highlights the importance of distinguishing between population means and individual preferences when interpreting mate
choice, and thus, adds depth to the concept of mating preferences as a motor for evolutionary change. 相似文献