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Physiological aspects of vetiver grass for rehabilitation in abandoned metalliferous mine wastes 总被引:16,自引:0,他引:16
Physiological aspects of why vetiver grass (Vetiveria zizanioides L.) can be tolerant to heavy metals and be used as an alternative method for rehabilitation of abandoned metalliferous mine wastelands have been investigated. The results showed that high proportions of lead and zinc (Pb/Zn) tailing greatly inhibited the leaf growth, dry matter accumulation, and photosynthesis of leaves, but stimulated the accumulation of proline and abscisic acid (ABA), and enhanced the activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT), implying that different mechanisms to detoxify active oxygen species (AOS) existed in different parts of plants. Physiological responses to heavy metal treatments differed greatly between roots and shoots. Nitrogen fertilizer application could greatly alleviate the adverse effects of high proportions of Pb/Zn tailing on vetiver grass growth. 相似文献
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Composted nitrogenous waste has the potential to produce excessive amounts of nitrous oxide (N2O), a potent greenhouse gas that also contributes to stratospheric ozone depletion. In this laboratory study, sawdust was irrigated with varying amounts of landfill leachate with high NH4+-N content (3950 mg l(-1)). Physicochemical properties, including the amount of N2O produced, were monitored during the composting process over 28 days. A rapid decline in NH4+-N in the first 4 days and increasing NO3--N for 11 days was followed by lower but stabilized levels of available-N, even with repeated leachate irrigation. Less than 0.03% of the leachate-applied N was lost as N2O. Higher leachate applications as much as tripled N2O production, but this represented a lesser proportion overall of the total nitrogen. Addition of glucose to the composting process had no significant effect on N2O production. The derived sawdust-leachate compost supported healthy growth of Sesbania rostrata. It is concluded that compost can be produced from sawdust irrigated with landfill leachate without substantial emission of N2O, although excessive flux of N2O remains about high application rates over longer time periods. 相似文献
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We examine how professional dual-earner couples, with school-age children, who worked from home during the COVID-19 lockdown, adjusted to the changes it brought to their lives. To do so, we conducted a qualitative study of 28 dual-earner households that had at least one school-age child, resided in China, Iran, Malaysia, the United Kingdom, or the United States, and worked from home during their local lockdown period. In each household, we interviewed the parents (56 total), and we asked at least one child to draw their perception of their parents' work-from-home experience and narrate the drawing (31 total). Informed by work–home interface and family stress scholarships, we outline the resources and demands generated by working at home as a family, as well as the strategies families employed to manage their collective work from home. We extend work-from-home scholarship beyond the individual level by accounting for the roles of all collective members in the work-from-home experience. We complement the research that has studied individual- and couple-level work–family strategies by theorizing the supportive, attentive, relational, delegative, and compromising strategies families adopted to generate changes in resource-demand dynamics. In doing so, we introduce family adaptive capability for the context of adjusting to work from home and define it as a collective ability to initiate strategies to meet remote work demands with resources generated from the new work arrangement. At a practical level, the strategies presented in our work can inform employers of dual-earner couples and families experiencing similar dynamics. 相似文献
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Jacqueline Loos Felipe Benra Marta Berbs-Blzquez Leah L. Bremer Kai M. A. Chan Benis Egoh Maria Felipe-Lucia Davide Geneletti Bonnie Keeler Bruno Locatelli Lasse Loft Barbara Schrter Matthias Schrter Klara J. Winkler 《Ambio》2023,52(3):477
Mainstreaming of ecosystem service approaches has been proposed as one path toward sustainable development. Meanwhile, critics of ecosystem services question if the approach can account for the multiple values of ecosystems to diverse groups of people, or for aspects of inter- and intra-generational justice. In particular, an ecosystem service approach often overlooks power dimensions and capabilities that are core to environmental justice. This article addresses the need for greater guidance on incorporating justice into ecosystem services research and practice. We point to the importance of deep engagement with stakeholders and rights holders to disentangle contextual factors that moderate justice outcomes on ecosystem service attribution and appropriation in socio-political interventions. Such a holistic perspective enables the integration of values and knowledge plurality for enhancing justice in ecosystem services research. This broadened perspective paves a way for transformative ecosystem service assessments, management, and research, which can help inform and design governance structures that nourish human agency to sustainably identify, manage, and enjoy ecosystem services for human wellbeing. 相似文献
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Due to material degradation in tubing, the heat exchanger for the primary coolant of the 1 MW Tsing Hua Open-pool Reactor has minor leakage to the secondary cooling system since 1970. In the past 20 years, trace amounts of 58,60Co, 51Cr, 137Cs, 54Mn, 46Sc, and 65Zn have leaked through the cooling system, accumulated, and eventually trapped in the discharge pond directly in front of the reactor. The distribution of these radionuclides in the mud at different depths and various locations in the pond was measured with standard procedures of radioactive soil sampling and counting techniques. Concentration of corrosion products, with no more than 40 KBq/Kg dry at the hottest spot, was contour-mapped to reveal the accumulation patterns of these trace level radioactive products at the end of the 20-year period. 相似文献
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