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21.
Sirkka Rissanen Hannu Rintamäki Ingvar Holder 《International journal of occupational safety and ergonomics》2013,19(4):451-461
The suitability of the IREQ (insulation required) index for predicting the thermal responses of 6 participants wearing chemical protective clothing was tested during exercise at -20 and -25 °C. IREQ was used to calculate duration limited exposure (DLE). Measured DLE correlated (r= .899, p < .001) with the predicted DLE. In exposures exceeding 40 min, however, the predicted DLE tended to be 10-20 min too short compared to the measured one. During short exposures the prediction was 5-20 min too long. The results show that IREQ overestimated the cold strain in participants wearing chemical protective clothing during cold exposures longer than 40 min. Nevertheless, predicted DLE never exceeded measured times and thus the prediction was always safe from the occupational point of view. 相似文献
22.
Peter Schröder Soile Juuti Sashwati Roy Heinrich Sandermann Sirkka Sutinen 《Environmental science and pollution research international》1997,4(3):163-171
During long-term exposure of pine (Pinus sylvestris L.) seedlings to trichloro- and monochloroacetic acids via root uptake or acid mist treatments, both substances were removed from the plant tissues by metabolic activity. None of the treated plants exhibited visible stress symptoms at the concentrations used. In addition, the exposure to both substances led to dramatic changes in the activity of xenobiotic detoxification enzymes (peroxidase and gluthatione S-transferase) in the needles of the plants. 相似文献
23.
Immobilization: A Revolution in Traditional Brewing 总被引:1,自引:0,他引:1
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The socio-demographic profiles and occupations of the members of the Green League and other Finnish political parties are examined using survey data collected from the members of Finland’s six major political parties (n = 12,427). Significant differentiation in occupational structure is revealed among Green party members. The importance of understanding how Green party members differ by background is emphasised while providing new approaches to studying party members’ interests and goals. 相似文献
26.
Pirita R?m?nen Pauliina Pitk?nen Saila J?ms? Sirkka Liisa Maunu 《Journal of Polymers and the Environment》2012,20(4):950-958
The feasibility of using alkyd-acrylic copolymers as a barrier material was studied. Copolymers of tall oil fatty acid or rapeseed oil-based alkyd resin and polyacrylates were synthesized and films of these copolymers were prepared. Nuclear magnetic resonance spectroscopy revealed that after copolymerization the proportion of double bonds in alkyd resin was diminished due to grafting reactions. The mechanical properties, such as strength and flexibility, of the copolymer films were tested, and the performance of the films as water, oil, and oxygen barrier was evaluated. An increased amount of alkyd resin made the films more brittle and increased their oxygen permeability, however, at the same time their hydrophobicity was increased. 相似文献
27.
Shtangeeva Irina Niemelä Matti Perämäki Paavo Popov Alexander Vesavaara Ilkka Suvela Ronja 《Environmental geochemistry and health》2022,44(2):537-550
Environmental Geochemistry and Health - Environmental pollution is becoming one of the most important global problems. Understanding the main factors affecting accumulation of toxic trace elements... 相似文献
28.
Ilkka Hanski 《Die Naturwissenschaften》2001,88(9):372-381
Much of spatial ecology since the late 1960s has been dominated by two theories, the dynamic theory of island biogeography and the classical metapopulation theory. The latter theory largely replaced the former one in the 1980s, especially in conservation applications. It is only recently that ecologists have fully realized that a relatively simple general theory can be readily constructed that makes some of the simplifying assumptions of the two earlier theories unnecessary. The spatially realistic metapopulation theory thereby provides a more unified framework for spatial ecology than the island theory or the classical metapopulation theory. This article describes the application of the spatially realistic metapopulation theory to real metapopulations living in highly fragmented landscapes. I discuss the principal messages for population ecology and conservation biology, and I also place this theory into a broader context of other approaches to spatial ecology. 相似文献
29.
Hellstén PP Kivimäki AL Miettinen IT Mäkinen RP Salminen JM Nystén TH 《Journal of environmental quality》2005,34(5):1665-1671
This paper presents results from a lysimeter experiment on the fate of potassium formate, an alternative deicing agent. The experiment was performed through the winter and spring to identify any thermal sensitivity in the transport and biodegradation of formate in the lysimeter. Ninety-eight percent of the total quantity of formate applied was degraded while percolating through the 1.7-m-thick unsaturated sand layer within the lysimeter. Concomitantly, the bicarbonate concentration of the percolating water increased. The low concentrations of nitrogen (0.02 mg L(-1)) and phosphorous (<0.002 mg L(-1)) in the percolated water, however, potentially limited microbial activity. During the study period, 99% of the applied potassium was retained in the lysimeter, and the ion exchange between the potassium and a variety of monovalent and divalent ions was assumed to be responsible for the leaching of barium, calcium, magnesium, and sodium from the soil material. Except for manganese, the concentrations of the studied metals in the percolated water did not exceed the threshold values set for drinking water by the Council of the European Union. By contrast, the application of potassium formate had a detrimental effect on the vegetation on the lysimeter. To conclude, formate was effectively degraded in the sandy lysimeter and its application did not cause major undesirable changes in the quality of the percolating water. Further research at field scale is, however, needed for instance on the biodegradation of potassium formate and on its impacts on roadside vegetation. 相似文献
30.
Ilkka Kaitila M.D. Pirkko Ämmälä Olavi Karjalainen Sirkka Liukkonen Juhani Rapola 《黑龙江环境通报》1983,3(3):237-244
Diastrophic dysplasia, an autosomal recessive disorder, results in severe short-limbed dwarfism, progressive spinal and joint problems, and secondary psychosocial disability. The results of treatments are unsatisfactory. Four pregnant mothers at risk for an affected fetus were studied with an ultrasound scanner at 16 and 19 weeks of gestation. Each mother had a previous child with diastrophic dysplasia. The biparietal distance and the length of the long bones of the extremities were normal in three fetuses, whereas in one fetus there was a 30 per cent shortening of all long bones. The biparietal distance corresponded with the gestational age in all fetuses. In one fetus, diastrophic dysplasia was confirmed by fetoscopy and fetal radiograph at 19 weeks of gestation after the parents had decided to terminate the pregnancy. The skeletal radiograph and autopsy findings of the fetus verified the diagnosis. All other mothers were followed with repeated ultrasound examinations, and they delivered healthy babies. The retrospective follow-up of the four previous pregnancies and of the present one with affected fetuses disclosed that two mothers had had vaginal bleeding, two lymphedema, one abdominal pains, and one mother had had polyhydramnios. These complications were, however, mild and transient, and they could not be regarded as specific for pregnancies with affected fetuses. 相似文献