首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 890 毫秒
1.
New Zealanders have little collective vision of their position and future in a globalising world. Recent developments in New Zealand's primary sector show potential pathways to the future. We explore two claims: thinking about New Zealand is to think about the emergence of Fonterra Co-operative Group in New Zealand's globalising economy. Thinking about Fonterra is to think about New Zealand and the implications that spring from globalising activities. Fonterra is a lens to understand better the possibilities and development options and the challenges that are arising as New Zealand forges its place in a globalising world.  相似文献   

2.
本文根据晋中五大盆地的热量、水量实测数据和当地的实际情况,分析计算了不同耕作制度下主要作物农田热量盈亏量和无灌溉条件下的水量盈亏量。为充分合理利用水热资源,发展农业生产,提供科学依据。  相似文献   

3.
This paper investigates the adventure racing phenomenon in Australia, highlighting the nature and extent of adventure racing, its potential environmental and socio-cultural impacts, and the challenges and opportunities it presents for protected area management. We argue that there is cause for concern about the impacts of adventure racing, in particular in a context where activities of this kind are likely to continue and increase in popularity, and where there is a lack of key information about impacts and management. In this context, there is a need for rigorous and informed discussion about adventure racing.  相似文献   

4.
Two injection tests, shallow and deep, followed by repeated temperature logging were performed in the Lake City, California OH-1 corehole, to delineate permeable zones, investigate the permeability of rocks adjacent to the wellbore, and to test the validity of maximum-reading thermometer (MRT) measurements collected during the drilling process that show lower than static temperatures above a depth of 2100 ft and significantly higher than static temperatures below a depth of about 2500 ft. The tests confirmed several permeable zones in OH-1. At about 300 ft, there is a strong zone of lateral flow, and at 947 ft there is a major outflow zone for injected fluid. Two other possible permeable flow zones were detected from the thermal recovery logs: one at about 1500 ft and another at about 2300 ft. The 2300 ft permeable zone seems to be an inflow zone, and the source of a probable downflow responsible for cooling the wellbore below about 2500 ft. The hotter MRT data obtained during drilling may be reconciled with the significantly lower static temperature logs if downflow from about 2300 ft is present.  相似文献   

5.
京津冀地区与长三角地区制造业区域专业化特征分析   总被引:4,自引:0,他引:4  
国内外有关区域专业化研究大多关于一个国家省区之间的专业化分工,对于一国之内经济区内部的区域专业化研究较少.然而,经济区内部分工是当前我国经济发展面临的热点问题,也是包括经济地理学在内的很多学科着力解释的重大议题.这里运用较为成熟的测度方法,以国家图书馆所能查到的最近的2003年各地市制造业分行业就业人口数据为数据源,测度描述区域专业化的区位基尼系数、区域专业化指数、区域分工指数等,综合全面地刻画"十一五"规划界定的京津冀地区和长三角地区区域专业化的行业特征和区域特征.另外,还比较了两个区域在专业化水平上的差异.  相似文献   

6.
牛生杰  吕晶晶  岳平 《中国沙漠》2013,33(6):1858-1865
利用“沙尘气溶胶辐射模型及气候环境生态效应研究”项目加强观测期在二连浩特气象站进行的温、风、湿探空观测资料及架设在朱日和气象站的气象激光雷达资料,采用综合评定法分析了内蒙古半干旱荒漠草原地区大气边界层的厚度、结构特征和变化规律,同时利用气象激光雷达回波资料及气溶胶消光系数在垂直高度上的分布特征,确定了朱日和地区边界层的高度及日变化特征。结果显示,用探空资料综合评定得到的二连浩特地区大气边界层总体厚度偏大,边界层最大厚度达到2 300 m,稳定边界层高度在300 m左右;1 000 m附近为风向的转变高度,其下全为偏东风,其上全为偏西风,边界层风速切变较大;午后到夜间,近地层有东风急流出现,急流最强可达12 m·s-1,急流高度在300 m;在600 m高度附近出现逆湿,低层逆湿现象夜间比白天显著。气象激光雷达资料显示,朱日和地区春季晴日混合层最大厚度可达2 400 m,出现在16:00左右。  相似文献   

7.
新疆塔里木河下游不同地下水位的胡杨水势变化分析   总被引:20,自引:5,他引:15  
结合塔里木河下游英苏与阿拉干两个断面距河道50m、100m与200m处胡杨茎水势的测定资料,对胡杨茎水势进行均值比较与检验分析,结果表明:胡杨茎水势变化既与地下水位有关,表现为在一定范围的地下水位条件下,胡杨茎水势变化随着地下水位的降低而升高;同时也与气候因子有联系,表现为在两个断面相应距离处的胡杨茎水势方差都没有显著差异。胡杨自身具有较强的抗旱性与适应性,能够在较深地下水位状态下,通过生理调节维持自身的水分需要而生存。  相似文献   

8.
Summary. Pacific earthquakes studied by Gogna, also three important explosions in the Tuamotu archipelago, are rediscussed. The results are very consistent, but those from Tuamotu are later than Gogna's by about 1 s in the times of P about 60°. Both sets of data give PKP residuals about -5 s about 140° - 142°, indicating that the observations there referred to the neighbourhood of the cusp of the travel-time curve but the ISS had compared them with the DEF branch. The corresponding difference in the 1940 tables is about 2 s.
Analysis at intervals of 1° indicated that the cusp of PKP is about 141° instead of 143° as in the 1940 tables and the difference between it and the DEF branch at these distances is about - 5 s.
Travel times of S under the Pacific were found but need more data, especially at distances under 10°.
Times of PcP reported by Kogan and Carder were compared with those calculated from P in Gogan's explosions, and indicated a radius of the core of 3479.8 ± 1.8 km.  相似文献   

9.
Haiti and other developing countries have increasingly turned to emigrant remittances as a potential source of development capital. There is a vigorous debate in the development community about the impacts of remittances, however, with concerns about dependence challenging the optimism about a potential new development engine. Based on interviews with forty-two remittance recipients in Haiti and forty-five corresponding senders in New York State, we find that the remittance economy in Haiti is indeed productive and has the potential to generate employment and other important development benefits. That said, there are important limitations created by broader political–economic conditions and deeply entrenched inequalities.  相似文献   

10.
Moving foreign human and financial capital through landed property is not a new phenomenon in Sydney. It is a recurring geopolitical strategy that is replete with intercultural tension and deep colonial roots. In contemporary Australia, there is an assumption in public policy and media rhetoric that there is a high level of public concern about foreign investment. However, there is little empirical data that examines public perceptions. In this study, we are interested in whether the dominant voices in this debate represent broad public views about this issue. We sought to fill this gap by conducting a survey of almost 900 Sydney residents, looking at their perceptions of foreign and Chinese investment. We find high levels of public concern and discontent about foreign investment amongst Sydneysiders, with Chinese investors being a key target of this discontent. In the context of high housing prices in Sydney, there were widely held concerns about housing affordability. Survey respondents had a sophisticated understanding of what influences house prices, but with an overemphasis on the role of foreign investment. There is a general lack of support for policy that encourages foreign investment, and a lack of confidence in how the government is regulating foreign investment. Half of our participants reported that they would not welcome Chinese foreign investment in their suburb.  相似文献   

11.
《The Journal of geography》2012,111(6):235-246
Learning about climate change is tangible when it addresses impacts that can be observed close to home. In this program, sixty-four diverse middle and high school students produced videos about locally relevant climate change topics. Graduate and undergraduate students provided mentorship. The program engaged students in research and learning about climate change, and sparked their interest in science careers. Evaluation results showed that students were highly motivated by the experience, developed a genuine interest in their science topic, learned about the scientific process, and developed twenty-first century skills. The program provided a unique and authentic approach to science learning and communication.  相似文献   

12.
The Holocene Evolution of the Ebre Delta Catalonia, Spain   总被引:2,自引:0,他引:2  
1 IntroductionThefirstrelevantinformationaboutthegeologyandevolutionarytrendsoftheEbredeltacameaspartofastratigraphicstudybyMaldonadoA[1].Hementionedthatduringthelasttransgressiveevent,thatisbeforesealevelreacheditspresentlevel,deltaicprogradationonl…  相似文献   

13.
罗万云  王光耀 《中国沙漠》2019,39(1):195-202
以甘肃省606份农户调查数据为研究样本,采用有序Logit模型分析了家庭禀赋、环境感知及控制变量对农民沙化土地治理满意度的影响。结果表明:农民对沙化土地治理持较为满意态度,其中参与治理的实验组农民沙化土地治理满意度明显高于未参与治理的对照组农民,这一结论通过对比回归得到印证。实验组农民沙化土地治理满意度受政府补贴和社会保障的影响大,家庭禀赋与对照组农民差异没有通过显著检验。环境感知与农民沙化土地治理满意度具有高度相关性,但实验组农民更关注周边植被覆盖度变化,对照组农民更关注绿洲保护功能。家庭禀赋、环境感知对农民沙化土地治理满意度的影响存在性别、教育程度、家庭结构的差异。沙化土地保护政策不应仅局限于沙化土地逆转,更应注重基于农民满意度的家庭福利改善。  相似文献   

14.
This paper involves a collection and communication of important knowledge about and experiences with outdoor recreation monitoring in Nordic coastal and marine areas. This is a topic that so far has received little attention, especially among researchers and practitioners working with outdoor recreation monitoring in Nordic coastal and marine areas, who are in need of knowledge on the topic in order to advance monitoring activities and procedures. To remedy this situation, the purpose of this paper is to provide a knowledge base by listing and describing central literature contributions with important insight into outdoor recreation monitoring in Nordic coastal and marine areas. More specifically, this includes information about: (a) where important knowledge about outdoor recreation monitoring in Nordic coastal and marine areas can be found, (b) who the main contributors are and (c) what monitoring knowledge that has been reported so far. The paper also examines what tasks lie ahead for researchers and area managers in order to improve knowledge about outdoor recreation monitoring in Nordic coastal and marine areas. The paper is a central contribution and addition to manuals on outdoor recreation monitoring that are currently available in the Nordic countries.  相似文献   

15.
茶卡盐湖为一封闭的内陆湖泊,无出湖的泄水口,主要入湖水量为河水,每年总计入湖河水量为0.557×108m3/a,泉水涌水量为0.0259×108m3/a,主要出湖水量为湖面上蒸发水量,年蒸发量为1.146×108m3/a,其次为人工采盐所耗水量为0.0185×108m3/a。茶卡盐湖卤水中主要盐类为NaCl、MgCl2、MgSO4及KCl,丰水季节卤水中NaCl含量较枯水季节的高,是开采石盐的最佳时期,枯水季节卤水中的钾盐和镁盐含量较丰水季节的高,是开采钾、镁盐的最佳期,枯水季节湖水中KCl含量最高值达2.01%,平均值为1.15%,已达单独开采的品位,可修建盐田,利用盐田日晒,制取钾盐,综合开发盐湖资源经济效益高。  相似文献   

16.
What and how we teach reflect personal views of our responsibilities in libera! education, and thus clarity about objectives is crucial to significant debate about teaching strategies. Learning liberal arts disciplines is the basic purpose of a curricular view of liberal education. With this view, our most significant teaching decisions concern the content of our discipline, and debate about teaching methods is relatively unimportant. Another and more comprehensive view considers not only disciplinary content but also development of cognitive styles and socio-psychological attributes that help the student continue to learn and contribute in a complex world. Teaching methods are matters of great importance with this view.  相似文献   

17.
Despite increased sexuality education in New Zealand, concern remains about high rates of sexually transmitted infection and unplanned pregnancy among young people. To understand this 'gap', we consider what high school students learn about sexual health, and where they learn it. Narrative evidence reveals the negative, risk-oriented nature of sexual health messages at school and at home. In these power-laden places, little information is imparted about several key issues, including emotions. Students are aware of such absences, and articulate a desire for more open discussions of sexual health and sexuality, as is possible in informal settings occupied by friends.  相似文献   

18.
There has been significant progress transforming semi-structured data about places into knowledge graphs that can be used in a wide variety of geographic information systems such as digital gazetteers or geographic information retrieval systems. For instance, in addition to information about events, actors, and objects, DBpedia contains data about hundreds of thousands of places from Wikipedia and publishes it as Linked Data. Repositories that store data about places are among the most interlinked hubs on the Linked Data cloud. However, most content about places resides in unstructured natural language text, and therefore it is not captured in these knowledge graphs. Instead, place representations are limited to facts such as their population counts, geographic locations, and relations to other entities, for example, headquarters of companies or historical figures. In this paper, we present a novel method to enrich the information stored about places in knowledge graphs using thematic signatures that are derived from unstructured text through the process of topic modeling. As proof of concept, we demonstrate that this enables the automatic categorization of articles into place types defined in the DBpedia ontology (e.g., mountain) and also provides a mechanism to infer relationships between place types that are not captured in existing ontologies. This method can also be used to uncover miscategorized places, which is a common problem arising from the automatic lifting of unstructured and semi-structured data.  相似文献   

19.
海螺沟冰川末端前,近2000m冰川退却迹地植被原生演替经历了:裸地-草本地被、柳-沙棘-水冬瓜、水冬瓜、云冷杉-桦-杜鹃及云冷杉五个发展阶段。据树木年轮推测,170年来冰川末端位置变化显著。植被发展过程、冰川退却速度与气候变化密切相关。与冰川退却对气候变化的响应相比,植被对气候变化的响应更为敏感。  相似文献   

20.
传统聚落景观基因信息图谱单元研究   总被引:4,自引:0,他引:4  
结合聚落景观基因学说,从建立我国传统聚落景观群系的信息图谱角度分析了传统聚落景观文化基因的特点,并提出景观文化基因信息单元的概念,探讨其提取方法;建立了聚落景观基因信息图谱的图谱单元模型并分析其表现方法.结合理论研究成果,设计了信息图谱的原型系统并进行了图谱数据库设计、图谱单元建模实验研究.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号