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31.
Jaya Kumar S Naik KA Ramanamurthy MV Ilangovan D Gowthaman R Jena BK 《Journal of environmental management》2008,89(1):35-44
The 26th December 2004 Indian Ocean tsunami devastated coastal regions of the Indian subcontinent. Andaman and Nicobar Islands, coastal stretches of Tamil Nadu, Andhra Pradesh and Kerala were the most affected regions of India. Changes in the beach profiles, long shore currents, breaking wave characteristics in the surf zone at selected locations along the Tamil Nadu coast were studied during January, April, October 2005 and January 2006. Long shore sediment transport rates were estimated from the observed parameters. Studies were carried out earlier (1995-1996 and 1998) to understand the coastal environment over a one-year cycle in the study region. The post-tsunami observations were compared with the earlier studies to establish the variations in the littoral environment and to ascertain the normalcy of the littoral environment in the post-tsunami scenario. From the changes in the beach profiles, the shoreline was observed to recede by about 20m and built-up of backshore by about 0.5m at most locations. Observations from the field investigations and comparisons with earlier studies along this stretch of the coastline indicate that the coastline is yet to return completely to normalcy. 相似文献
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阐述了天津港的发展前景,对港区环境质量现状和环保设施作了全面的调研,根据可持续发展的思想,提出了与天津港发展相应的环保规划设想。 相似文献
35.
川中丘陵区土地资源的可持续利用——以乐至县为例 总被引:1,自引:0,他引:1
川中丘区是四川省粮食经济作物的主产区,土壤肥沃、耕地少、土地利用复杂。以乐至县为例,探讨了该县土地资源的可持续利用。 相似文献
36.
Luisa Franzini Margaret O’Brien Caughy Saundra Murray Nettles Patricia O’Campo 《Journal of environmental psychology》2008
Theoretical explanations and empirical evidence of how disorder is perceived and its relation to independently observed measures of disorder are rare. In recent work, Sampson and Raudenbush [2004. Seeing disorder: Neighborhood stigma and the social construction of “Broken Windows”. Social Psychology Quarterly, 67(4), 319–342] investigated how individuals form perceptions of disorder and found that perceptions of disorder in Chicago neighborhoods are shaped not only by observable conditions of disorder, but also by neighborhoods’ racial and socioeconomic composition. In this paper, we investigate the bases for perceiving disorder with data from Baltimore using a methodology similar to that used by Sampson and Raudenbush (2004). Using surveys, systematic social observations, census data, and police records to investigate variations in individual perceptions of disorder at the individual and neighborhood levels, this study, consistent with the literature, finds that visual cues of disorder are not unambiguous and that perceptions of disorder are based not only on neighborhood observed disorder but also on individual characteristics of residents and neighborhood social structure. Additionally, our findings indicate that neighborhood poverty and not neighborhood racial composition affects perceptions of disorder in Baltimore. The fact that these findings are in contrast to the findings in Chicago suggests that the influence of racial segregation on perception of disorder is imbedded in the larger historical context. 相似文献
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针对电导率观测过程中可能遇到的各种影响观测质量的因素进行分析和探讨,通过各种条件实验,指出排除这些干扰的具体方法,从而提高电导率的观测质量。 相似文献
38.
针对气井套管环空带压问题,通过研究气体在套管水泥环内的渗流规律,建立了气体渗流的连续性方程和运动方程,并求解出气体在水泥环中的渗流速率。通过分析井口泄压时针型阀处的气体流动状态,得出泄压时的气体泄放速率。以气体渗流速率和泄放速率为基础,结合井口的气体状态方程,分别建立了套管环空压力恢复与泄压预测模型。根据现场A气井实际数据进行实例计算,研究结果表明:所建模型计算的套管环空压力值与现场实测数据吻合,验证了模型的准确性。研究结果对套管环空带压的诊断评估和环空压力的控制具有重要意义。 相似文献
39.
建立资源节约型社会经济体系的初步构想 总被引:7,自引:0,他引:7
陆大道 《中国人口.资源与环境》1993,3(4):24-30
本文根据我国人口、资源、环境的现状提出了资源节约型社会经济体系的构想,着重论述了这种社会经济体系的总体框架、基本构想途径以及实现资源节约型社会经济体系所必须的观念转变和对策措施。 相似文献
40.
Pamo ET 《Environmental monitoring and assessment》2004,99(1-3):211-221
Water is the major food component for the maintenance of animals. Although Africa is endowed with diverse agricultural environments,
the survival of animals in Sahelian and sub-Sahelian Africa is threatened by the lack of water. Animals need water as an essential
nutrient, a component of the body, and for conductive or evaporative cooling. Water needs are met mainly through drinking
free water and to a lesser extent by utilising water that forms part of the feed. However during the long dry season, surface
water resources dwindle and the water content of available forage decreases, thereby increasing the animals’ demand for water.
Consequently animals have to walk for long distances to obtain adequate forage and water, which in turn raises the demand
for these resources. Water can be used to direct and regulate rangeland management in this open access environment, to maintain
range resources and to improve their quality. Water development, which takes into consideration usable forage, despite some
intra- or inter-annual variability, plays an important role and its spatial distribution will affect the grazing intensity
of forage resources. Sound water development and management strategies integrating local communities in the decision-making
will set up a firm basis for sustained range management in the free and open access environment of sub-Saharan Africa where
lack of financial input, social and cultural habits and above all the environmental condition do not permit large scale fencing
as in other parts of the world. 相似文献