Impact of the tsunami and earthquake of 26th December 2004 on the vital coastal ecosystems of the Andaman and Nicobar Islands assessed using RESOURCESAT AWiFS data   总被引：2，自引：0，他引：2  

Anjali Bahuguna  Shailesh Nayak  Dam Roy 《International Journal of Applied Earth Observation and Geoinformation》2008,10(2):229-1

Tsunami waves struck the Indian coast on 26th December 2004 affecting the Andaman and Nicobar group of islands. A quick assessment of the status of the vital coastal ecosystems has been made using pre- and post-tsunami Advance Wide Field Sensor (AWiFS) data of Indian satellite RESOURCESAT with an accuracy of 87–90% and the Kappa ranging from 0.8696 to 0.9053. Among the coastal ecosystems the coral reefs have suffered the maximum with the Nicobar reefs (69% eroded and 29% degraded) bearing the brunt more than the Andaman reefs (54% eroded and 22% degraded). Significant improvement to the condition of the reef damaged due to backwash has been noted. About 41% of the Sentinel reef area has undergone significant improvement. The continuance of the erosion of the southwestern Andaman reefs is due to the impact of recurring earthquakes. The impact on mangroves of both the groups of islands has been due to uprooting as well as inundation of seawater and resulting stagnation. Changes are expected in community structure of mangroves as a result of tsunami.  相似文献   

怒江迪庆州陡坡耕地的改良和持续利用研究     

刘彦和  何大明 《云南地理环境研究》1996,8(2):34-43

滇西北的怒江、迪庆两州地处云南省高寒高山峡谷区，地形破碎而陡峻，耕地稀缺，陡坡种植业占有很高的比重。由于人口的增长，陡坡耕地仍将作为该地区的主要耕地长期存在。这种传统的耕种方式已对环境产生了深刻的负效应。本文根据其生存条件和利用现状就通过改良以取得持续利用的方向和途径作了初步探讨。  相似文献   

6 kV电缆中间接头故障原因分析及制作工艺改进     

林继雄 《广东海洋大学学报》2000,20(3):60-63

6k V电缆中间接头的爆炸是工厂配电设备的常见故障。本文从电缆的绝缘结构方面入手 ,以绝缘热击穿理论分析了湛江电厂 # 3循环水泵电机电缆中间接头爆炸原因 ,查找导致电缆头热击穿的关键因素并进行排除 ,运用新的材料与方法重新制作 # 3循环水泵电机电缆中间接头 ,运行可靠性大有提高。改进的结果表明 ,减少缆芯的接触电阻和环境温度与绝缘结构的适当选取是杜绝高压电缆中间接头爆炸的关键。  相似文献   

Private sector involvement in urban governance: The case of Business Improvement Districts and Town Centre Management partnerships in England   总被引：1，自引：0，他引：1  

Ian R. Cook 《Geoforum》2009,40(5):930-478

Although it has many merits, the voluminous literature on urban governance gives scant attention to the actual involvement and positioning of business elites and businesses within Public-Private Partnerships. There is also little consensus among academics as to why the private sector become involved in such schemes. This paper begins to address these issues through a critical empirical examination of how and why the private sector is involved with three English Town Centre Management (TCM) partnerships and the Business Improvement District (BID) subsidiaries all three partnerships have recently developed. In order to do this, the empirical study is guided by a conceptual framework that foregrounds the relationship between (a) the opening up and monitoring of ‘institutional space’ by partnerships and the state, and (b) the motivations and ‘constrained agency’ of the business elites. The paper demonstrates that the positioning of the private sector is more multifarious and fractured than previous studies of urban governance have suggested. It also reveals that business elites and businesses view their participation as an ‘investment’ that needs to accrue significant financial returns and that partnership and state officials are highly selective in their choice of ‘who governs’.  相似文献   

Policing,Partnerships, and Profits: The Operations of Business Improvement Districts and Town Center Management Schemes in England     

《Urban geography》2013,34(4):453-478

This study considers the emergence of Public Private Policing Partnerships (PPPPs) in England and focuses on two increasingly common partnership bodies in particular: Business Improvement Districts (BIDs) and Town Center Management (TCM) schemes. It argues that in order to fully understand the operations of these partnerships, research must pay attention to their introduction, evolution, and social relationships. Through comparative case studies of local TCM schemes and BIDs in Coventry, Plymouth, and Reading, it reflects on the ways in which policing services are speculatively used to improve the "experience"' of being downtown, and increase the likelihood of consumers and investors spending more in their district. It also sheds light on the evolving policing "portfolios" the partnerships have developed and the roles that socio-technologies (e.g., CCTV, circulars) play in shaping the performance and relations of the partnerships.  相似文献   

改良黄土强度特性与工程处置试验研究   总被引：1，自引：0，他引：1  

李志清  余文龙  范林峰  付乐  胡瑞林  林杜军  王艳萍 《工程地质学报》2011,19(1):116-121

本文针对山西朔州典型黄土,利用素黄土与石灰粉煤灰、石灰水泥、水泥粉煤灰三种改良黄土,进行了击实特性、抗剪强度特性及崩解特性试验研究,提出了黄土改良的最佳方案,并采用该方案对山西某煤矿电梯井填方段进行了数值模拟分析,验证了石灰粉煤灰改良黄土工程应用的可行性。试验结果表明:粉煤灰与黄土形成致密的混合结构,石灰的掺入,激活了粉煤灰的活性,发生了一系列的水化反应,使改良黄土的强度大大提高,改良黄土在物理力学性质方面有明显改善。  相似文献   

海域立体分层使用的现实困境与制度完善          下载免费PDF全文

李彦平  李晨钰  刘大海 《海洋开发与管理》2020,37(9):3-8

近年来，随着我国海洋开发利用规模的持续增长，不同项目重叠用海的问题开始凸显，海域立体分层使用模式得到广泛关注。海域立体分层使用以海域的立体性、多宜性等自然属性为基础，以协调竖向空间的用海活动为目的，是未来海洋空间管理制度体系变革的方向之一。现行的海域空间“平面化”管理思路，使海域立体分层使用面临竖向空间边界不清、二维海籍管理模式不适用、缺少立体空间规划及利益相关者协调难度大等问题。通过借鉴土地立体分层使用的经验，结合海域空间自然特征与开发利用特点，分别从海域分层方法、三维海籍信息表达方式、海域立体空间规划、设立海域役权等方面提出对策建议，以期为海域空间立体分层使用提供借鉴。  相似文献   

太原市防震减灾科普宣传现状及改进对策     

卫露媛 《山西地震》2021,(1):54-56

以太原市防震减灾中心开展的防震减灾科普宣传工作为基础,分析太原市防震减灾科普宣传工作的现状、存在的问题,并提出要适应新时代防震减灾工作的需求,发挥新媒体宣传的优势、创新科技成果等方面进行改进,通过科普宣传更大程度地提升公众防震减灾意识和应对灾害的能力。  相似文献   

热熔器内部加热电阻的改进设计     

韩冰  曹品鲁  陈晨 《江苏地质》2006,30(1):58-60

热熔钻进是一种新式钻进技术。自从20世纪60年代,美国Los A lamos国家实验室(LANL)开始研究热熔器钻具以来,对热熔器的结构及材料的选择一直没有完全定位。我国在这方面的研究进行的比较晚,在试验结果研究的基础之上以直径80mm热熔器为例对其内部加热电阻进行了改进设计。  相似文献   

由单Doppler雷达资料反演水平风场的简单共轭函数方法的改进方案   总被引：12，自引：1，他引：12       下载免费PDF全文

邱崇践 Xu.  O 《应用气象学报》1996,7(4):421-430

该文改进了Qiu和Xu提出的由单个Doppler雷达探测的资料反演水平风场的简单共轭（simple adjoint）函数方法。其基本做法是将控制方程中的状态变量改用其时间距平量代替，并加入一待反演的方程误差项。利用1988年夏季在美国丹佛机场所作的一次下击暴流的双Doppler雷达观测试验资料对新方法作了检验，结果表明其对反演结果的改善是显著的。  相似文献