全文获取类型
收费全文 | 372篇 |
免费 | 65篇 |
国内免费 | 35篇 |
专业分类
安全科学 | 95篇 |
废物处理 | 2篇 |
环保管理 | 111篇 |
综合类 | 98篇 |
基础理论 | 118篇 |
环境理论 | 2篇 |
污染及防治 | 10篇 |
评价与监测 | 12篇 |
社会与环境 | 11篇 |
灾害及防治 | 13篇 |
出版年
2024年 | 4篇 |
2023年 | 39篇 |
2022年 | 32篇 |
2021年 | 31篇 |
2020年 | 26篇 |
2019年 | 24篇 |
2018年 | 22篇 |
2017年 | 17篇 |
2016年 | 19篇 |
2015年 | 17篇 |
2014年 | 14篇 |
2013年 | 28篇 |
2012年 | 17篇 |
2011年 | 17篇 |
2010年 | 18篇 |
2009年 | 27篇 |
2008年 | 16篇 |
2007年 | 17篇 |
2006年 | 26篇 |
2005年 | 10篇 |
2004年 | 5篇 |
2003年 | 5篇 |
2002年 | 2篇 |
2001年 | 3篇 |
2000年 | 9篇 |
1999年 | 5篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 5篇 |
1995年 | 5篇 |
1994年 | 3篇 |
1993年 | 1篇 |
1991年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有472条查询结果,搜索用时 78 毫秒
361.
两宋时期自然灾害的文学记述与地理分布规律 总被引:2,自引:0,他引:2
两宋320年间共发生灾害1739次,灾害种类14种,如此深重的灾害是导致两宋"积贫积弱,国力不强"的一大主要因素.由于宋朝时期的地理气候特点,水灾、旱灾接连不断发生,并且成为两宋最主要的自然灾害.古代自然灾害研究主要依据史书记载,中国是世界上少数灾害多发的国家之一,文学作品中反映出来的灾难与救世观念可以给人们很多启发.以王禹偁为代表的宋代文学家给后世留下了许多记述灾害的文学作品,从文学作品的记述中可以提取古代灾害的准确信息.北宋都城位于开封,南宋京都在杭州,由于史料对当时中央政府所在地省份的记述颇为翔实,两宋自然灾害的省区分布,以河南、浙江灾害次数最多. 相似文献
362.
目的 基于某汽车在中国吐鲁番地区自然暴露的部件温度变化试验数据,预测该车在美国凤凰城地区气象环境下的汽车部件温度变化。方法 把汽车部件的温度作为输出变量,提取影响汽车部件温度变化的关键特征(试验时间、大气温度、太阳辐照)作为输入变量,同时运用公式对不同纬度地区部件受到的太阳辐照进行修正,以消除地理位置的影响。利用Python等软件构建机器学习模型,用吐鲁番试验数据训练模型,然后预测该车部件在美国凤凰城地区的温度变化。结果 梯度提升机模型具有良好的泛化能力和预测精度,其预测值与实际值的平均绝对误差均在3.3°以内,拟合优度R2均大于0.90。BP神经网络和随机森林算法模型也具有较好的预测精度。结论 利用汽车在我国试验站点进行的自然暴露试验数据,可以预测该汽车部件在国外相似地区气象条件下的温度变化。该研究对于依据汽车部件在我国的自然暴露试验结果预测其他国家相似地区自然环境下汽车部件的温度变化具有一定的指导意义。 相似文献
363.
Brandie Fariss Nicole DeMello Kathryn A. Powlen Christopher E. Latimer Yuta Masuda Christina M. Kennedy 《Conservation biology》2023,37(1):e13973
Efforts to devolve rights and engage Indigenous Peoples and local communities in conservation have increased the demand for evidence of the efficacy of community-based conservation (CBC) and insights into what enables its success. We examined the human well-being and environmental outcomes of a diverse set of 128 CBC projects. Over 80% of CBC projects had some positive human well-being or environmental outcomes, although just 32% achieved positive outcomes for both (i.e., combined success). We coded 57 total national-, community-, and project-level variables and controls from this set, performed random forest classification to identify the variables most important to combined success, and calculated accumulated local effects to describe their individual influence on the probability of achieving it. The best predictors of combined success were 17 variables suggestive of various recommendations and opportunities for conservation practitioners related to national contexts, community characteristics, and the implementation of various strategies and interventions informed by existing CBC frameworks. Specifically, CBC projects had higher probabilities of combined success when they occurred in national contexts supportive of local governance, confronted challenges to collective action, promoted economic diversification, and invested in various capacity-building efforts. Our results provide important insights into how to encourage greater success in CBC. 相似文献
364.
Iain Dickson Stuart H. M. Butchart Allison Catalano David Gibbons Julia P. G. Jones Katie Lee-Brooks Thomasina Oldfield David Noble Stuart Paterson Sugoto Roy Julien Semelin Paul Tinsley-Marshall Rosie Trevelyan Hannah Wauchope Sylvia Wicander William J. Sutherland 《Conservation biology》2023,37(1):e13967
Although some sectors have made significant progress in learning from failure, there is currently limited consensus on how a similar transition could best be achieved in conservation and what is required to facilitate this. One of the key enabling conditions for other sectors is a widely accepted and standardized classification system for identifying and analyzing root causes of failure. We devised a comprehensive taxonomy of root causes of failure affecting conservation projects. To develop this, we solicited examples of real-life conservation efforts that were deemed to have failed in some way, identified their underlying root causes of failure, and used these to develop a generic, 3-tier taxonomy of the ways in which projects fail, at the top of which are 6 overarching cause categories that are further divided into midlevel cause categories and specific root causes. We tested the taxonomy by asking conservation practitioners to use it to classify the causes of failure for conservation efforts they had been involved in. No significant gaps or redundancies were identified during this testing phase. We then analyzed the frequency that particular root causes were encountered by projects within this test sample, which suggested that some root causes were more likely to be encountered than others and that a small number of root causes were more likely to be encountered by projects implementing particular types of conservation action. Our taxonomy could be used to improve identification, analysis, and subsequent learning from failed conservation efforts, address some of the barriers that currently limit the ability of conservation practitioners to learn from failure, and contribute to establishing an effective culture of learning from failure within conservation. 相似文献
365.
Rui Liang Chao Chen Akash Kumar Junyu Tao Yan Kang Dong Han Xianjia Jiang Pei Tang Beibei Yan Guanyi Chen 《Frontiers of Environmental Science & Engineering》2023,17(4):44
366.
Haoyang Xian Pinjing He Dongying Lan Yaping Qi Ruiheng Wang Fan Lü Hua Zhang Jisheng Long 《Frontiers of Environmental Science & Engineering》2023,17(10):121
367.
368.
Between uncertainty and hope: Young leaders as agents of change in sustainable small-scale fisheries
Alejandro Espinoza-Tenorio Romana Gabriela Ehuan-Noh Gabriela Alejandra Cuevas-Gmez Nemer E. Narchi Dora Elia Ramos-Muoz Francisco J. Fernndez-Rivera Melo Antonio Saldívar-Moreno Jos Alberto Zepeda-Domínguez Juan Carlos Prez-Jimnez Alma Oliveto-Andrade Jorge Torre 《Ambio》2022,51(5):1287
The path to sustainable small-scale fisheries (SSF) is based on multiple learning processes that must transcend generational changes. To understand young leaders from communities with sustainable SSF management practices in Mexico, we used in-depth interviews to identify their shared motivations and perceptions for accepting their fishing heritage. These possible future decision-makers act as agents of change due to their organizational and technological abilities. However, young people are currently at a crossroads. Many inherited a passion for the sea and want to improve and diversify the fishing sector, yet young leaders do not want to accept a legacy of complicated socioenvironmental conditions that can limit their futures. These future leaders are especially concerned by the uncertainty caused by climate change. If fishing and generational change are not valued in planning processes, the continuity of fisheries, the success of conservation actions, and the lifestyles of young fishers will remain uncertain.Graphical abstract Supplementary InformationThe online version contains supplementary material available at 10.1007/s13280-021-01639-2. 相似文献
369.
Learning after a disaster is crucial in creating more resilient places. However, many societies are repeatedly overwhelmed by disasters. This can be because of missed opportunities to learn in post‐disaster settings or because of actions implemented that seem to be highly relevant to recovery in the short term, but potentially constrain aspirations in the longer term. This paper assesses learning processes among state and non‐state actors and the ways in which these are bridged and scaled up to wider improvements in governance. Aiming to enrich understanding of post‐disaster learning, it explores different actors’ response actions after the earthquakes in Christchurch, New Zealand, in 2010 and 2011. On the one hand, ‘learning by doing’ is occurring, yet, on the other hand, systemic learning is hindered by mismatches between top‐down steering and bottom‐up initiatives. The study concludes that better linking and synergising of learning processes among different levels is vital for enhancing resilience in post‐disaster societies. 相似文献
370.
Functional agrodiversity can be useful and even essential for, i.e., the long-term sustainability of agriculture. However, still many aspects of this concept are not well understood. The interplay between species in diverse agro-ecosystems is based on processes as, i.e., competition, facilitation, and predator-prey relations. The net-effect of these processes on crop growth is not static and can change over time as the relative density of species change. The equilibrium state of a diverse agro-ecosystem might be far from optimum or even unproductive. This makes agrodiveristy a concept which is not easily grasped nor obtained or maintained. We believe that an agent-based model can facilitate learning on the topic of functional agrodiversity. In this paper, we present the agent-based simulation model, Agrodiversity v.2, developed in Netlogo 3.1.5. The model simulates a virtual diverse agro-ecosystem with four ecological agents. The user is challenged to explore ecological parameters and design a productive sustainable system. The model's “simplest playing level” shows that a proper balance between the co-existing species is necessary so that their ecological interactions allow the multi-species system to become self-organized and persist over time. It demonstrates the transient nature of profitable functional agrodiversity. Our analysis on the effects of using Agrodiversity v.2 on actual learning shows that the learning took place. Students increased the quality of their answers to paper-based individual questions on the topic from 29% during passive/conceptual teaching to 86% after the simulation session. On average students stated to have learnt 55% of their current knowledge through the workshop of which 76% was learnt by using the simulation. 相似文献