共查询到20条相似文献，搜索用时 218 毫秒
1.
Abhinaba Das 《Resonance》2018,23(6):669-681
A unique attribute of Earth is the presence of plate tectonics. Not only does it give rise to continents, mountain chains, and ocean basins but also promotes a high level of biodiversity. It is the reason for the formation of the so-called ‘Pacific Ring of Fire’ – a belt of intense volcanic activity and a large number of earthquakes surrounding the Pacific ocean. But what drives the plate motion? Did Earth always have plate tectonics? These are some fascinating geoscientific questions. In trying to answer these questions, an effort is made to impress upon the reader the vast ocean of uncertainty, and hence the opportunity, in the field of Earth and Planetary Sciences. To make it more engaging, the article provides a peek into the long process which culminated in the present-day theory of plate tectonics on Earth. While the first half of the article focuses on subduction and its cause, the second half summarizes a recent finding made on the surface of Europa. In view of readability across disciplines, the complex subject details are kept to bare minimum. 相似文献
2.
This article studies the conceptions of the interior of the Earth held by Portuguese elementary school children and senior citizens. Several studies were conducted regarding conceptions related to Earth sciences, such as rocks, minerals, earthquakes geological time, and Earth structure. Most of these studies involved students enrolled in compulsory education, some involved higher education students, several involved teachers, and only a few involved adults. The majority of the results showed that many misconceptions are held by people of all ages. Similar results were found in this study, as both children and senior citizens revealed several misconceptions. The research resorted to a questionnaire based on a drawing task so as to find out the way that children and senior citizens imagine the structure and composition of the interior of our planet. A comparison between children’s and senior citizens’ drawings was made, as well as a comparison between those drawings and the historical models of the internal structure of the Earth. We found that only a small number of children and even a smaller number of senior citizens recognize that the interior of the Earth is organized in concentric layers. They assume that soil and water are a common part of the internal composition of our planet. Similarities between the drawings and the historical models were identified, particularly similarities related to Gautier’s model, which accepts the possibility of the existence of life in the interior of the planet as it happens on its surface. 相似文献
3.
通过研究中国的长时间地震序列,发现在过去700年中存在有明显的44年周期．利用这一周期进行预测的话,可以很好地计算出唐山地震和汶川地震的发震年份．同时利用该周期预测了未来几年国内强震的发震时间,研究认为2015年我国可能发生强烈地震． 相似文献
4.
INTRODUCTIONTheboundaryelementmethodisanefficientnumericalmethodforsolvingpracticalengineer ingproblems ,andisparticularlyattractivefortheanalysisofelasticmechanicsproblems,asonlytheboundaryoftheproblemisrequiredtobediscretized .Themainadvantageofthebound… 相似文献
5.
城市规划教学中数据～形态联动思维的建立依靠两款软件在设计过程中的辅助：GIS将抽象的数据图像化;Google earth将图像数据化。先通过文献数据库的检索了解国内有关GIS和Google earth的研究,进而探讨GIS和Google earth两款软件在城市规划设计中的应用,以建立规划教学中数据一形态联动思维。 相似文献
6.
This paper discusses the application of the boundary contour method for resolving plate bending problems. The exploitation
of the integrand divergence free property of the plate bending boundary integral equation based on the Kirchhoff hypothesis
and a very useful application of Stokes' Theorem are presented to convert surface integrals on boundary elements to the computation
of bending potential functions on the discretized boundary points, even for curved surface elements of arbitrary shape. Singularity
and treatment of the discontinued corner point are not needed at all. The evaluation of the physics variant at internal points
is also shown in this article. Numerical results are presented for some plate bending problems and compared against analytical
and previous solutions.
Project(No: ZE0208) supported by the National Science Foundation of Zhejiang Province, China 相似文献
7.
S.F. Akkerman 《International Journal of Educational Research》2011,50(1):21-25
In the literature on boundaries, it is sometimes falsely assumed that learning naturally evolves from a co-location of diverse practices and perspectives. Empirical studies indicate that this is not self-evident. The aim of this article is to understand the challenge of learning at the boundary. In the light of this aim, the article interprets empirical findings from two previous longitudinal studies of academic projects, in which educational scholars, with diverse cultural backgrounds and different academic perspectives, collaboratively conduct research and encounter boundaries during interaction. The case studies show that (1) boundaries that people encounter can easily stay implicit during ongoing negotiations, and (2) when people do identify boundaries and explicate them during collaborative processes, dialogical engagement is triggered. On the basis of the findings, I argue that explicitly identifying boundaries enables learning since it creates a collective need to take more into account some unfamiliar perspective or practice. 相似文献
8.
梁楠 《陕西教育学院学报》2012,28(4):81-85
地震数据的观测是持续进行的,随着时间的推移数据的规模会不断扩大,这些数据中隐藏着地震发生的前兆特征.科学地截取这些数据的有用片段,对数据进行合理地预处理,建立地震预测模型来研究地震发生前的数量特征,用数学方法可以揭示地震前兆的某些数据特征.利用已采集到西安2005年至2009年按小时观测的9个指标的数据进行研究,结果显示:在地震发生时刻点前一定范围内,不同阶的差分曲线相交或近似相交为一点. 相似文献
9.
北宋嘉佑二年(1057年)幽州大地震是华北地震史上较有影响的强震之一。文章在重新查阅相关历史资料,比较不同版本地震目录所给出的参数基础上,对此次地震重新进行了考订:幽州大地震的发震时间应在嘉佑二年四月六日(1057年5月11日)前后;地震的宏观震中大致在今河北中部与北京、天津交界的安次一带;同时对幽州大地震的其他参数,提出了与相关学者的一些商榷。 相似文献
10.
The virtual laminated element method (VLEM) can resolve structural shape optimization problems with a new method. According
to the characteristics of VLEM, only some characterized layer thickness values need be defined as design variables instead
of boundary node coordinates or some other parameters determining the system boundary. One of the important features of this
method is that it is not necessary to regenerate the FE (finite element) grid during the optimization process so as to avoid
optimization failures resulting from some distortion grid elements. The thickness distribution in thin plate optimization
problems in other studies before is of stepped shape. However, in this paper, a continuous thickness distribution can be obtained
after optimization using VLEM, and is more reasonable. Furthermore, an approximate reanalysis method named “behavior model
technique” can be used to reduce the amount of structural reanalysis. Some typical examples are offered to prove the effectiveness
and practicality of the proposed method.
Project (No. 50075083) supported by National Natural Science Foundation of China 相似文献
11.
Due to the high market demands for professional engineers in the Arab oil-producing countries, the appetite of Middle Eastern students for high-paying jobs and challenging careers in engineering has sharply increased. As a result, engineering programmes are providing opportunities for more students to enrol on engineering courses through lenient admission policies that do not compromise academic standards. This strategy has generated an influx of students who must be carefully educated to enhance their professional knowledge and social capital to assist in future earthquake-disaster risk-reduction efforts. However, the majority of Middle Eastern engineering students are unaware of the valuable acquired engineering skills and knowledge in building the resilience of their communities to earthquake disasters. As the majority of the countries in the Middle East are exposed to seismic hazards and are vulnerable to destructive earthquakes, engineers have become indispensable assets and the first line of defence against earthquake threats. This article highlights the contributions of some of the engineering innovations in advancing technologies and techniques for effective disaster mitigation and it calls for the incorporation of earthquake-disaster-mitigation education into academic engineering programmes in the Eastern Mediterranean region. 相似文献
12.
The earthquakes that rocked the city of Christchurch and surrounding districts in Canterbury, New Zealand, were to take their toll on families, schools and communities. The places that had once represented safety and security for most children were literally and figuratively turned upside down. Rather than reinforce the trauma and continue to frame children as passive victims, the study reported here aimed to help children reframe their experiences through active engagement in participatory research projects. This article reports on three schools drawn from a UNESCO-funded project in which schools recorded their earthquake stories. While children were the centre of each of the school’s earthquake stories, schools engaged children to different extents in their chosen projects. These three schools exemplify different places along a continuum of children’s engagement in research on their own experiences. In one school, children, families, teachers and the principal all contributed to an illustrated book of their experiences. In another school, children created a series of mosaic panels to record the community’s story before, during and after the earthquakes. In the third school, children became documentary makers and interviewed other children about their earthquake experiences. In all cases, children found their projects positive and helpful activities, enabling them to put their experiences into a broader context. This article argues that schools have an important role to play in providing emotional processing activities which help children gain perspective and distance as part of their recovery from large-scale disaster events. 相似文献
13.
临沂市主要自然灾害类型及防灾减灾对策 总被引：1，自引：0，他引：1
对临沂市的旱涝灾害、地震灾害及地质灾害进行了研究,发现临沂市的旱涝灾害发生频率高,汛期暴雨日数与旱涝等级有很好的吻合．地震灾害在1668年以前,多发生于郯城、临沂、莒县和费县、蒙阴等地,震点分布较分散,1668年后多出现于沂沭断裂带以东地区,震点分布呈现出明显的自郯城至莒县的带状特点;1970年以后的现代地震,主要发生在沂、沭断裂带上．地质灾害主要伴随洪涝、地震灾害发生．在综合临沂市自然灾害发生规律的基础上,提出了对各类自然灾害的防灾、减灾对策． 相似文献
14.
从2003年开始，中印关系朝着更加成熟、更加理性和更加务实的方向发展。然而，中印之间如欲实现长期的建设性合作的伙伴关系，就应摈弃传统地缘政治观念，消除两国在认知上的误解，同时还应消除边界问题上的误解，公正合理地解决边界问题。从战略眼光分析，两国之间的分歧和竞争并不妨碍双方在具有共同利益问题上的合作。 相似文献
15.
在江苏省实现了基于开源GIS的地震应急信息可视化平台(江苏省地震局有感地震信息管理系统)的构建与应用。系统采用B/S架构,选用GeoServer+Tomcat+GeoWebCache组合技术,整体具有良好的性能体验。系统包括地震影响场评估、地震事件管理和基础数据管理3个子系统,并在江苏省多次有感地震应急(演练)中采用。应用效果表明,该系统在省、市、县地震应急及震后资料建档中能够发挥重要的作用,且对于现场工作队开展工作能够提供较大的方便。 相似文献
16.
首次组合运用卫星云异常和长波辐射热异常方法,依据2012年10月四川西部地区的云异常和热异常,较为成功地对2013年4月20日雅安芦山7.0级地震做出了中期预测,并于2012年10月22日向中国地震局提交了正式预测卡片.2013年1月18日在紧邻理塘的白玉县发生5.4级地震,4月20日在雅安芦山发生7.0级地震.事实证明,这次预测震级准确,时间推迟了3个月,距离误差若按中心点计算为250 km,若按边缘计算为50 km.若能结合其他观测数据,则有可能进一步缩小误差.8月份在我们划定的区域周边又发生了迪庆5.9级地震和西藏6.1级地震.雅安7.0级地震的日期和2012年10月19日雅安4.2级小震的发震日期呈明显的对应关系,显示其可能受某种天文因素的控制.以上发现有利于对今后的地震做出更准确的预测. 相似文献
17.
Satish R. Shetye 《Resonance》2005,10(2):8-19
Tsunamis are surface gravity waves that are triggered due to perturbation of the ocean floor. The tsunamis that occurred in
the Indian Ocean on 26 December 2004 were due to an earthquake off the coast of Sumatra. Sea level variations associated with
this event are summarized after a brief introduction to tsunamis. 相似文献
18.
2008年5月12日14时28分,四川省汶川发生8.0级强烈地震,造成惨重伤亡,全民悲痛。然而在国家遭遇重大灾害之际,在大众热切关注受灾地区情势的大背景下,诈骗犯们却认为他们的"商机"来了,于是冒天下之大不韪进行各式各样的诈骗活动,诈骗短信内容也不断有新的版本。 相似文献
19.
雷晓敏 《广东教育学院学报》2011,(2):16-18
近10多年来地震频繁袭击中日两国。地震是地球的一种病症,也与地球子民即人类的折腾有关。人类务必将抗震减灾的思想提高到战略高度来认识。防震抗震应成为恒久的国策。防震抗震作为特殊事件要有特殊举措。防震抗震是综合性的战略,这是人类建设地震文化的一系列重要课题。为了筹划和建设一种地震文化,应把防震抗震提升到地球意义的向度来理解。关心地球疾病,实现人类在灾害学方面的突破,这是对地震学的升华,也是对人类自身品质的提高。 相似文献
20.
Priya Khambhaita 《British Educational Research Journal》2014,40(6):1019-1035
This paper presents new findings on the experiences of Indian mothers in the roles they play in their daughters' higher education (HE) subject choices. Whilst there are existing studies on White British mothers and parents more generally in terms of parental involvement in education, and a growing number of papers presenting results on Bangladeshi and Pakistani parents, evidence on Indian parents (and students) is relatively sparse. In particular, there is a lack of research where Indian parents are given space to voice their own narratives in their own words. In the main, existing studies focus on parents from the viewpoint of their children as students. This qualitative study involved semi‐structured interviews with nine Indian mothers from different areas in England. Commonalities and disparities between the experiences of Indian mothers presented here and accounts of White mothers of similar class and educational backgrounds presented in existing literature are analysed using an intersectional lens. Results show that working class Indian mothers could be making up some of their disadvantage in terms of social and cultural capital through family and community networks. Furthermore, mothers regard younger relatives as potential sources of important knowledge and resources that could help them and their daughters navigate the HE landscape. This has not been found in studies on White mothers where the emphasis instead has been on the exchange of knowledge from adults to the younger generation. This article arises out of an ESRC funded doctoral study of choice at university for British South Asian women. 相似文献