全文获取类型
收费全文 | 290篇 |
免费 | 6篇 |
专业分类
安全科学 | 14篇 |
废物处理 | 16篇 |
环保管理 | 60篇 |
综合类 | 44篇 |
基础理论 | 72篇 |
污染及防治 | 51篇 |
评价与监测 | 27篇 |
社会与环境 | 8篇 |
灾害及防治 | 4篇 |
出版年
2024年 | 1篇 |
2023年 | 4篇 |
2022年 | 7篇 |
2021年 | 3篇 |
2020年 | 3篇 |
2019年 | 3篇 |
2018年 | 4篇 |
2017年 | 8篇 |
2016年 | 10篇 |
2015年 | 10篇 |
2014年 | 14篇 |
2013年 | 20篇 |
2012年 | 10篇 |
2011年 | 22篇 |
2010年 | 6篇 |
2009年 | 10篇 |
2008年 | 17篇 |
2007年 | 13篇 |
2006年 | 9篇 |
2005年 | 10篇 |
2004年 | 4篇 |
2003年 | 8篇 |
2002年 | 11篇 |
2001年 | 5篇 |
2000年 | 6篇 |
1999年 | 8篇 |
1997年 | 5篇 |
1996年 | 4篇 |
1995年 | 4篇 |
1994年 | 5篇 |
1993年 | 5篇 |
1992年 | 5篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 6篇 |
1984年 | 4篇 |
1983年 | 3篇 |
1982年 | 6篇 |
1981年 | 3篇 |
1980年 | 4篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1975年 | 1篇 |
1970年 | 1篇 |
1959年 | 1篇 |
排序方式: 共有296条查询结果,搜索用时 0 毫秒
31.
32.
Margaret Gooch 《Local Environment》2005,10(1):5-19
This paper discusses findings of a study of catchment care volunteers drawn from the east coast of Queensland, Australia. Catchment volunteering includes individuals in not-for profit stewardship groups with a catchment focus. Catchment volunteering was experienced by participants as maintaining a balance of perspectives; developing/maintaining an identity; networking; learning; empowering; and sustainable. An illustrative model (the Outcome Space), representing a set of scales, shows the relationship between conceptions.
Results indicate that catchment volunteering offers many benefits to individuals and local communities. Although there were frustrations at times, many volunteers expressed deep levels of satisfaction about their volunteering experiences. Results suggest that satisfied volunteers are those that manage to balance volunteering with other aspects of their lives; identify strongly with some aspect of volunteering; enjoy learning from their volunteer experiences; and were willing and able to share and apply their new knowledge in a variety of ways. They also made friends with other volunteers; felt valued by others in the group, and believed that what they do is important. For these respondents, volunteering contributes richly to the fabric of their lives, providing meaning and satisfaction in routine activities, enhancing local communities and building sustainability. 相似文献
Results indicate that catchment volunteering offers many benefits to individuals and local communities. Although there were frustrations at times, many volunteers expressed deep levels of satisfaction about their volunteering experiences. Results suggest that satisfied volunteers are those that manage to balance volunteering with other aspects of their lives; identify strongly with some aspect of volunteering; enjoy learning from their volunteer experiences; and were willing and able to share and apply their new knowledge in a variety of ways. They also made friends with other volunteers; felt valued by others in the group, and believed that what they do is important. For these respondents, volunteering contributes richly to the fabric of their lives, providing meaning and satisfaction in routine activities, enhancing local communities and building sustainability. 相似文献
33.
The aim of this paper is to use Erikson's approach to human development, and specifically generativity, as a framework by which to explore older people's experiences of environmental stewardship activities. Using data from a large qualitative study of environmental volunteers resident in the coastal fringes of Queensland, Australia, the paper provides important, illustrative, empirical support for Erikson's theory of generativity in later life. Findings suggest that older people are much more likely to connect their environmental actions with the longer-term future, and express a need to leave a lasting legacy for future generations. According to respondents, the later years are a time to contribute to the environment as part of a broader cycle of life. The environment is also an important site for intergenerational activities. Whilst the work presented here is only a small, localized study, use of Erikson's theory of human development as a framework helps demonstrate the importance of a generative response in later life. 相似文献
34.
Mark J. Pettenati Margaret Berry Vandana Shashi J. Hartley Bowen Margaret Harper 《黑龙江环境通报》2001,21(6):435-440
The prenatal diagnosis of a complete trisomy of the long arm of chromosome 1 is reported. Major ultrasound findings included: nuchal thickening, bi-temporal narrowing, a single choroid plexus cyst, andmild ventriculomegaly. There was a mass in the chest and abdomen, pleural effusion, ascites and a hyperechoic bowel. Skin edema was present. The fetus died at 26 weeks' gestation. A literature review is presented of 17 de novo and two inherited cases with only trisomy 1q. Of note is the fact that 3/5 prenatally detected 1q trisomies have teratomas. A review of the literature reveals a dismal outcome fortrisomy 1q cases if the duplication involves bands 1q25→q32. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
35.
Speed-accuracy tradeoffs are a common feature of decision-making processes, both in individual animals and in groups of animals working together to reach a single collective decision. Individual organisms display consistent differences in their “impulsivity,” and vary in their tendency to make rapid, impulsive choices as opposed to slower, more accurate decisions. However, we do not yet know whether groups of animals consistently differ in their tendency to prioritize decision speed over accuracy. We challenged 17 swarms of honey bees (Apis mellifera) to simultaneously choose a new nest site in each of three locations, and measured their decision speeds in each trial. We found that swarms displayed consistent personality differences in the number of waggle dances and shaking signals they performed and in how actively they scouted for new nest sites. However, swarms did not consistently differ in how long they took to choose a nest site. We suggest that house-hunting A. mellifera swarms may place an especially high emphasis on decision accuracy when choosing a nest site, and that chance events—such as the time when each swarm discovers a sufficiently high-quality nest site—may consequently play a greater role in determining a swarm’s decision speed than intrinsic characteristics such as a swarm’s “impulsivity.” 相似文献
36.
Although palms are the most commonly harvested tree family in the world, they are susceptible to overexploitation, and many harvest schemes are not sustainable. We assessed the impact of leaf harvesting of the Asian palm, Livistona rotundifolia , in North Sulawesi, Indonesia, to determine the effect of harvest intensity on subsequent growth and to determine if current harvest practices are ecologically sustainable. We conducted experimental harvests of two intensities and compared results with a control. Leaf emergence, expansion, opening, and maturation were monitored for 1 year. Leaves in heavy and light harvest treatments grew and opened significantly faster than control leaves. Final leaf size was a function of harvest intensity: control leaves were larger (4.06 m) than light-harvest leaves (3.62 m) and heavy-harvest leaves (2.62 m). Census results for palms in harvested and unharvested areas indicated that palm density was twice as high and reproductive-sized palms were 10 times more common in the unharvested area. We judged current harvest practices to be nonsustainable. Recommendations for sustainable harvesting include reduction of harvest intensity and waste and preservation of reproductive-sized palms. 相似文献
37.
Summary Larvae of Myrmeleon immaculatus in large pits captured both large and samll prey, while larvae in small pits captured only the small prey. Larvae in small pits did not respond to large ants, although they always responded by sand-flinging to small ants. Larvae in medium-sized pits often captured large ants only after prolonged and vigorous sand-flipping. Larvae in large pits usually captured large ants with relatively little sand-flipping. Pit enlargement and pit relocation in the laboratory were not significantly correlated with reduction of rations in the first 3 weeks after a pit was built. However, after a month without food, larvae on the average moved once every 10 days, built successively smaller pits, and moved longer distances before building a new pit. In the field pits were dug primarily in response to microclimatological factors and possibly edge-effects. The presence or absence of suitable prey at a site, per se, had no effect on whether or not a larva would dig a pit there. We conclude that these sit-and-wait predators have a relatively large repertoire of behavior that enhances their foraging success, and we contrast it with previously made optimal foraging models relating to pit locations, pit relocations, pit size and ant lion responses. 相似文献
38.
Margaret E. Elmes MB BS PhD J. Clarkson PhD J. Gwyn Jones PhD 《Environmental geochemistry and health》1983,5(2-3):85-87
The zinc content of intestinal epithelial cells in human jejunum and ileum has been measured using X-ray microanalysis. The range of values was wide, the highest being found in stem cells and enterocytes. Significant differences were found in jejunum from gastric carcinoma patients and ileum from Crohn's disease patients compared with patients with non malignant, non inflammatory disease. 相似文献
39.
Margaret E Slade 《Journal of Environmental Economics and Management》1982,9(2):122-137
This paper attempts to reconcile the theoretical predictions of increasing real prices for nonrenewable natural-resource commodities obtained from Hotelling-style models with the empirical findings of falling prices for these commodities. A theoretical model for relative-price movements is derived for the case of exogenous technical change and endogenous change in the grade of ores mined. The model suggests a U-shaped time path for relative prices. The implied price movements are tested for all the major metals and fuels and the model parameters are found to be statistically significant for 11 out of the 12 commodities tested. 相似文献
40.
Margaret E. Elmes Johanna P. Clarkson B. Jasani 《Environmental geochemistry and health》1985,7(4):127-130
Immunoreactive metallothionein has been demonstrated in formalin fixed sections of rat and human tissue using a DNP hapten sandwich staining procedure and antibody to zinc-induced rat liver metallothionein II.MT was found in rat liver, duodenum, jejunum and ileum and in human liver and ileum both intracellularly in hepatocytes and enterocytes and extracellularly in portal vessels, sinusoids and canaliculi in the liver and in the lamina propria of the intestine.Changes in intensity of staining were related in the rat to the feeding/fasting status of the animal and whether exogenous zinc had been administered. In man least MT was found in the ileum of patients with Crohn's disease and most in patients with non-inflammatory bowel disease.These results confirm that MT is an important physiological metal-binding protein in man and animals and is concerned in zinc transport and binding in rats. 相似文献