全文获取类型
| 收费全文 | 593篇 |
| 免费 | 77篇 |
| 国内免费 | 42篇 |
专业分类
| 测绘学 | 35篇 |
| 大气科学 | 145篇 |
| 地球物理 | 307篇 |
| 地质学 | 140篇 |
| 海洋学 | 28篇 |
| 天文学 | 5篇 |
| 综合类 | 17篇 |
| 自然地理 | 35篇 |
出版年
| 2024年 | 5篇 |
| 2023年 | 10篇 |
| 2022年 | 19篇 |
| 2021年 | 28篇 |
| 2020年 | 25篇 |
| 2019年 | 23篇 |
| 2018年 | 17篇 |
| 2017年 | 20篇 |
| 2016年 | 16篇 |
| 2015年 | 18篇 |
| 2014年 | 40篇 |
| 2013年 | 34篇 |
| 2012年 | 38篇 |
| 2011年 | 40篇 |
| 2010年 | 34篇 |
| 2009年 | 33篇 |
| 2008年 | 47篇 |
| 2007年 | 47篇 |
| 2006年 | 25篇 |
| 2005年 | 23篇 |
| 2004年 | 18篇 |
| 2003年 | 24篇 |
| 2002年 | 25篇 |
| 2001年 | 17篇 |
| 2000年 | 12篇 |
| 1999年 | 11篇 |
| 1998年 | 10篇 |
| 1997年 | 9篇 |
| 1996年 | 9篇 |
| 1995年 | 10篇 |
| 1994年 | 7篇 |
| 1993年 | 10篇 |
| 1992年 | 4篇 |
| 1991年 | 2篇 |
| 1990年 | 2篇 |
排序方式： 共有712条查询结果，搜索用时 312 毫秒
91.
92.
The ability to plan for a disaster is associated with a range of contextual factors and often traverses several sites of inequities, including sociodemographic and institutional disparities. While multiple studies have investigated the relationship of housing insecurity with adverse outcomes after a disaster, fewer studies have examined how housing insecurity is associated with disaster preparedness. This paper hypothesizes social and structural vulnerabilities to be directly associated with preparedness. Housing insecurity is posited to have both direct and multiplicative effects with social vulnerability on the dependent variable. We use nationally representative data from the 2017 American Housing Survey. The final weighted study sample consisted of 29,070 housing units, with 52% male and 48% female householders. Fifty-seven percent of the population was not prepared with food, water, emergency funds, and transportation. Housing security and quality emerged as important conditions for households to be better prepared. Further, housing insecurity moderated the relationship between some social vulnerability factors and preparedness. The study helps identify where resources and research funds should be targeted to reduce multidimensional vulnerabilities before a disaster. Safe and affordable housing is central to climate and environmental justice; centering disaster readiness, response, and climate action across policy agendas is vital. 相似文献
93.
As the severity and frequency of extreme weather events become more pronounced with climate change and the increased habitation of at-risk areas, it is important to understand people’s resilience to them. We quantify resilience by estimating how disasters in the US impacted individual wellbeing in the initial weeks and months post-disaster, and whether the effect sizes differed by individual- and county-level factors. The methodological approach contrasts changes in wellbeing in counties affected by disasters with that of residents in unaffected counties of the same state. We find that people’s hedonic wellbeing is reduced by approximately 6% of a standard deviation in the first two weeks following the event, with the effect diminishing rapidly thereafter. The negative effects are driven by White, older, and economically advantaged sub-populations, who exhibit less resilience. We find no evidence that existing indices of community resilience moderate impacts. Our conclusion is that most people in the US have a resilient response to extreme weather events. 相似文献
94.
Scientific and effective heritage monitoring can not only realize the conservation of the heritage itself and the maintenance of its values, but it can also realize the sustainable development of the heritage site. In order to promote the conservation and management of Globally Important Agricultural Heritage Systems (GIAHS), this study proposed a design for the annual report of GIAHS monitoring under the overall framework of the GIAHS monitoring system, and explored the application of the annual report in the first GIAHS site in China: the Qingtian Rice-Fish Culture System. In the design scheme of this study, the GIAHS annual monitoring report is composed of 24 monitoring items, with each of them logically related. It is to be filled in by the bureaus of the heritage site and reported through the GIAHS dynamic monitoring system. The results of an analysis of the annual reports of Qingtian Rice-Fish Culture System for four years showed that Qingtian County has taken a series of conservation and development measures which have reduced the area of abandoned paddy, enhanced the unit benefit of agri-products, and increased the farmers’ income. At the same time, the heritage site is faced with various challenges and threats, such as the weakening of the tourism attraction, the aging of the heritage practitioners, and the limitation of the heritage-themed agri-products and tourism income, which need to be addressed with proper measures. The results can also provide guidance for other GIAHS based on indications that heritage sites should improve the development of cultural products, the construction of social organization and the cultivation of spontaneous publicity, and an exchange and learning mechanism should be established among them in the future. The design and application of the GIAHS annual monitoring reports can not only provide specific guidance for conducting the GIAHS monitoring, but also lay the foundation for evaluating the effectiveness of GIAHS conservation and management. This study is expected to help enrich the theory of GIAHS monitoring, further promote China’s GIAHS monitoring work, and also provide China’s experience for the benefit of international GIAHS monitoring efforts. 相似文献
95.
96.
97.
基于2021年、2022年中国5.0级及以上地震目录,结合应急管理部、有关省(自治区、直辖市)地震局的地震灾害评估报告和相关资料,对中国大陆地震灾害情况、主要地震灾害事件及其特点进行了总结和分析。此外,按省份总结了各省地震灾害事件及地震灾害特点。其中,云南省中强震多、强震少,震区房屋抗震能力较高,人员伤亡较小; 四川省中强震少、强震多,次生灾害较为发育,造成严重人员伤亡; 青海省虽然震级高、破坏性强、致灾范围广,但震区地广人稀,房屋抗震设防等级较高,人员伤亡少。最后,结合历史震害统计数据,分析对比近2年中国大陆地震灾害致灾特点。 相似文献
98.
选取2009—2015年内蒙古测震台网速报的46个M≥4.1地震,依据《地震震级的规定》(GB17740—2016)中关于量取地震宽频带面波震级M_(S(BB))的各项条款,重新量取M_(S(BB)),与中国地震台网中心编目结果产出的M震级和M_(S7)震级进行对比分析,结果显示:M_(S(BB))震级与M_(S7)震级的一致性较好。 相似文献
99.
本文以“社交媒体多层次信息流”为概念框架,分析了四川九寨沟7.0级地震发生后,个人、当地的组织、宏观层面的主流媒体使用社交媒体所发挥的作用。通过对微博的数据进行挖掘分析,总结出地震灾害发生后社交媒体所具有的5项功能:人际之间的交流,地方政府、本土组织以及当地媒体的传播渠道,大众传媒信息发布的渠道,信息的收集和分享,微观、中观以及宏观各主体间沟通的渠道。在强震发生后社交媒体有巨大的传播潜力,本文的研究成果对未来大震发生后如何利用社交媒体来应对灾害有一定的借鉴意义。 相似文献
100.