全文获取类型
收费全文 | 1032篇 |
免费 | 11篇 |
国内免费 | 15篇 |
专业分类
安全科学 | 43篇 |
废物处理 | 40篇 |
环保管理 | 123篇 |
综合类 | 190篇 |
基础理论 | 175篇 |
环境理论 | 1篇 |
污染及防治 | 351篇 |
评价与监测 | 70篇 |
社会与环境 | 50篇 |
灾害及防治 | 15篇 |
出版年
2023年 | 18篇 |
2022年 | 22篇 |
2021年 | 35篇 |
2020年 | 27篇 |
2019年 | 23篇 |
2018年 | 50篇 |
2017年 | 48篇 |
2016年 | 58篇 |
2015年 | 38篇 |
2014年 | 60篇 |
2013年 | 72篇 |
2012年 | 61篇 |
2011年 | 81篇 |
2010年 | 53篇 |
2009年 | 43篇 |
2008年 | 63篇 |
2007年 | 58篇 |
2006年 | 63篇 |
2005年 | 46篇 |
2004年 | 34篇 |
2003年 | 18篇 |
2002年 | 19篇 |
2001年 | 9篇 |
2000年 | 9篇 |
1999年 | 2篇 |
1998年 | 3篇 |
1997年 | 9篇 |
1996年 | 2篇 |
1995年 | 5篇 |
1994年 | 2篇 |
1993年 | 4篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1986年 | 2篇 |
1984年 | 1篇 |
1966年 | 1篇 |
1961年 | 1篇 |
1960年 | 1篇 |
1959年 | 1篇 |
1958年 | 1篇 |
1957年 | 1篇 |
1954年 | 3篇 |
1951年 | 1篇 |
1936年 | 1篇 |
排序方式: 共有1058条查询结果,搜索用时 703 毫秒
451.
452.
453.
454.
Communal nursing, the provision of milk to non-offspring, has been argued to be a non-adaptive by-product of group living. We used 2 years of field data from a wild house mouse population to investigate this question. Communal nursing never occurred among females that previously lacked overlap in nest box use. Females nursed communally in only 33 % of cases in which there was a communal nursing partner available from the same social group. Solitarily nursing females were not socially isolated in their group; nevertheless, high spatial associations prior to reproduction predict which potential female partner was chosen for communal nursing. An increase in partner availability increased the probability of communal nursing, but population density itself had a negative effect, which may reflect increased female reproductive competition during summer. These results argue that females are selective in their choice of nursing partners and provide further support that communal nursing with the right partner is adaptive. 相似文献
455.
456.
Water is a scarce resource in many parts of the developed world. Two solutions are possible to address water scarcity: conservation of existing resources, or the further production of water from new sources e.g. through recycling of wastewater or desalination of seawater. However, the main hurdle to implementation of many of these solutions is often viewed as a lack of public willingness to adopt these alternative water behaviours. Research in this area is therefore crucial. Yet, and possibly due to the interdisciplinary nature of such research, there is currently no comprehensive overview of what has been done before. This study fills this gap by (1) choosing a general consumer behaviour perspective as a starting point, (2) developing a conceptual model of research required in the area of water-related public acceptance studies, (3) identifying eight key water-related behaviours which require future research attention, and (4) reviewing which areas of the conceptual model have been investigated in the past by conducting an extensive literature review of water-related social science research.The review established that the majority of work which has been conducted is located at the cross-roads of personal characteristics and behavioural intentions. Significant gaps exist in relation to researching the adoption of a wide range of demand-side water behaviours. This indicates a dominance of supply-side solutions in social-research exploration. The review identifies a number of research needs including: the exploration of actual adoption of water-related behaviours (rather than behavioural intentions); and to widen the scope of water behaviour enquiry to include more demand-side solutions. Given the increasing scarcity of water in many areas of the world, addressing these identified gaps will be of significant importance. Thus our model informs the social-research agenda for water policy. 相似文献
457.
458.
459.
460.