共查询到20条相似文献，搜索用时 78 毫秒
1.
Land consolidation （LC）, as a type of human disturbance, improves land production efficiency and changes landscape distribution through land parcel reallocation. The objective of this study was to comparatively analyze the changes of landscape patches before and after a land consolidation project （LCP） and the effects of land levelling, irrigation and drainage work and road engineering on the landscape structure. FRAGSTAT3.3 and buffer zone analysis were used to investigate those changes. The results suggest that the heterogeneity of landscape depressed, and tended to simplification after LC. Dry land was the most highly variable land use pattern, and the change of forestland was least due to its locations at a gradient larger than 25°. LC resulted in a more rational use of land, and could be an important step in promoting rural development in depressed and fragmented agricultural areas through unused land exploitation, small-patch combination, irrigation and water conservancy, and road construction. Land levelling leveled off the gradient field surface and decreased the slope. The fragmentized patches were much more incorporated with increasing slope. On the other hand, the ridge of a field became longer so that the length of field surface and area of patch were increased. Land levelling regulated, simplified and combined patches, .so that the complexity degree was reduced. It is found that the buffer distance of 35 m was a turning point of human disturbance by irrigation and drainage systems, and patches presented flaky distribution when the buffer distance was smaller than 35 m. Meanwhile, the distance range between 25 m to 50 m was an impressible area for road engineering, which was sensitive to human actions, and the changes of all landscape metrics were larger than those in other buffer zones. In general, LC not only reallocated fragmented parcels, but also improved agricultural conditions. 相似文献
2.
Satellite remote sensing for urban growth assessment in Shaoxing City, Zhejiang Province 总被引：1，自引：0，他引：1
Urban growth represents specific response to economic, demographic and environmental conditions. Rapid urbanization and industrializations have resulted in sharp land cover changes. The present investigation was carried out from Shaoxing City to quantify satellite-derived estimates of urban growth using a three-epoch time series Landsat TM data for the years 1984, 1997 and ETM 2000. The methodology used was based on post classification comparison. The use of GIS allowed spatial analysis of the data derived from remotely sensed images. Results showed that the built-up area surrounding Shaoxing City has expanded at an annual average of 7 km2. Analysis of the classified map showed that the physical growth of urban area is upsetting the other land cover classes such as farming, water resources, etc. The study conclusion mainly emphasized the need for sustainable urban capacity. 相似文献
3.
Land degradation is one of the severe environmental problems in China. In order to combat land degradation, a soil conservation program was introduced since 2000 to reduce soil erosion by converting slope-cultivated land into forestry and pasture. This paper represents the first systematic attempt to investigate the impact of the soil conservation program on land degradation in the loess plateau. The results indicate that the soil conservation program to convert slope fields into forest or pasture is an effective way to combat soil erosion. However, a subsidy that is higher than profit of land use activity of slope fields before their conversion into forest and pasture is needed to encourage farmers to join the conservation program. A policy measure to encourage and assist farmers to develop sedentary livestock by using crops produced from fields as well as fodder and forage grass from the converted slope fields might contribute to combat soil erosion. Increase in off-farm job opportunities may encourage 相似文献
4.
陈政辉 《重庆大学学报(英文版)》2003,2(2)
1. Introduction Land market is the base of real estate market. Most developed countries and regions have quite mature land market. There are two types of countries and regions in view of the land ownership, i.e. state-owned one that transfers only the usufruct to a land user such as in Singapore, Malaysia, etc., and privately owned one for which the land is owned by individual, such as in Japan, U.S., Britain, France, etc. Chinese urban land is owned by the state, so, what users acquire is … 相似文献
5.
Environmental impact prediction using remote sensing images 总被引：1，自引：0，他引：1
Pezhman ROUDGARMI Masoud MONAVARI Jahangir FEGHHI Jafar NOURI Nematollah KHORASANI 《浙江大学学报(A卷英文版)》2008,9(3):381-390
Environmental impact prediction is an important step in many environmental studies. A wide variety of methods have been developed in this concern. During this study, remote sensing images were used for environmental impact prediction in Robatkarim area, Iran, during the years of 2005-2007. It was assumed that environmental impact could be predicted using time series satellite imageries. Natural vegetation cover was chosen as a main environmental element and a case study. Environmental impacts of the regional development on natural vegetation of the area were investigated considering the changes occurred on the extent of natural vegetation cover and the amount of biomass. Vegetation data, land use and land cover classes （as activity factors） within several years were prepared using satellite images. The amount ofbiomass was measured by Soil-adjusted Vegetation Index （SAVI） and Normalized Difference Vegetation Index （NDVI） based on satellite images. The resulted biomass estimates were tested by the paired samples t-test method. No significant difference was observed between the average biomass of estimated and control samples at the 5% significance level. Finally, regression models were used for the environmental impacts prediction. All obtained regression models for prediction of impacts on natural vegetation cover show values over 0.9 for both correlation coefficient and R-squared. According to the resulted methodology, the prediction models of projects and plans impacts can also be developed for other environmental elements which may be derived using time series remote sensing images. 相似文献
6.
The status of English in today’s world has been established definitely.It is not only embodied in the increasing numbers of speakers,but also embodied in the role which English has played in some non-English speaking countries.English is spread as an International language in worldwide and which is no longer belonging to any English speaking countries but belonging to those who use it(McKay,2002).The consequences of English spreading are:on one hand,English as an international lingua franca status has been further consolidated;on the other hand,different regional variants appear in English.These changes lead to the debate between Standard English and varieties of English.All of these in turn generate a profound impact on English language teaching.China as one of non-English speaking countries has also been the impact of globalization in English.The English teaching in China is facing challenges and innovation. 相似文献
7.
Shan-long Lu Xiao-hua Shen Le-jun Zoue Chang-jiang Li Yan-jun Mao Gui-fang Zhang Wen-yuan Wu Ying Liu Zhong Zhang 《浙江大学学报(A卷英文版)》2008,9(6):858-866
The classification of thematic mapper imagery in areas with strong topographic variations has proven problematic in the past using a single classifier, due to the changing sun illumination geometry. This often results in the phenomena of identical object with dissimilar spectrum and different objects with similar spectrum. In this paper, an integrated classification method that combines a decision tree with slope data, tasseled cap transformation indices and maximum likelihood classifier is introduced, to find an optimal classification method for thematic mapper imagery of plain and highland terrains. A Landsat 7 ETM＋ image acquired over Hangzhou Bay, in eastern China was used to test the method. The results indicate that the performance of the integrated classifier is acceptably good in comparison with that of the existing most widely used maximum likelihood classifier. The integrated classifier depends on hypsography （variation in topography） and the characteristics of ground truth objects （plant and soil）. It can greatly reduce the influence of the homogeneous spectrum caused by topographic variation. This integrated classifier might potentially be one of the most accurate classifiers and valuable tool for land cover and land use mapping of plain and highland terrains. 相似文献
8.
Tamara Tomasegovic Paula Yadranka Zitinski Elias Marina Baracic Nikola Mrvac 《美中教育评论》2011,(2):198-203
Implementation of information and communication technologies as well as emersion of new user interfaces and web 2.0 technologies changes the way of education system, the way of living and business transactions in general. The way we communicate, operate, produce and live is also changing. In accordance with it, the systems of education change from traditional to modern. The following changes occur： from content delivery to knowledge production, from transfer of knowledge from teachers to students towards encouragement of development and construction of knowledge, from courses and programs changing to the adaptation of the study environment, from the faculty professionalism to the quality of teaching and student learning and the early involvement of students in research work and projects. These occurring changes also affect the students＇ and professors＇ mobility. Here, the word ＂mobility＂ represents not only the student exchange programs and the easier transitions from one＇s home university to a foreign one, but also the way professors conduct their classes. With the development of certain software, students＇ class attendance no longer represents an important factor, as they can now learn from distance using the mentioned software, taking the learning process one step further. In order for above-mentioned changes to occur, the use of e-learning and the development of new tools are almost mandatory. With this in mind, the goal of this paper is to analyze quantitatively the changes that are occurring almost every day that affect the students＇ learning and the professors＇ teaching methods. 相似文献
9.
温婧 《语数外学习(高中版)》2013,(3):75-75
Through frequent use,in fact and actually have come to encode some combination of information(propositional content) and the speaker’s attitude about this proposition(propositional attitude) In line with the development of English actually and in fact,they illustrate a trajectory of(inter)subjectification moving from objective meanings of sequence toward(inter)subjective meanings.Therefore,there is consensus that the concept of(inter)subjectification does indeed characterize the changes that such words undergo in their historical development.Thus,they have argued that subjecti?cation can be considered as "the major type of semantic change". 相似文献
10.
In the background of a new round reform and western development strategy, making suitability evaluation of construction land complex topography area in southwest China scientifically and accurately has an important guiding significance on the construction of local urban and rural development. We selected economic factor of construction, safety factor of construction, factor of the present situation of land use and ecological protection factor in Tongzi county as evaluation indexes, and ascertained the weight of each elastic indicator using the analytic hierarchy process method. By the support of GIS and RS technology, we combined the single-factor qualitative classification with the multi-factor weighted overlay analysis to make comprehensive suitability evaluation of construction land on the whole study area. And five different types of construction land were divided, namely, ‘excellent', ‘very good', ‘good', ‘moderate' and ‘poor'. The result shows that the area of ‘excellent' construction land is 30.47 km~2(0.95%), 101.46 km~2(3.16%) of ‘very good', 550.34 km~2(17.16%) of ‘good', and 664.69 km~2(20.72%) and 1 860.65 km~2(58.01%) of ‘moderate' and ‘poor', respectively. The land space bearing capacity is a population of 791 600, and the remaining population capacity is 170 900 persons. 相似文献
11.
This paper first investigates the phenomenon of changing English in our global village and the possible reasons for the changes,and then tries to discuss how people can understand this kind of change in terms of English is regarded as lingua franca nowadays.Finally,the implications and suggestions are drawn in terms of how people should have appropriate attitudes towards those changes. 相似文献
12.
Due to large-scale dredging operations, a large amount of sludge is inevitably produced. Large areas of land are occupied when the dredged sludge is discarded in the disposal site as waste material. The sludge dewatering with aeration-vacuum (SDAV) method is suit for treating the sludge with high water content and high clay content in the disposal site. The water in the sludge can be discharged out. The volume of the sludge can be reduced quickly, and the recycling of the land can be accelerated by this method. Most importantly, this technique is an efficient way to deal with clogging problems when pumping water from high water content, high clay content dredged sludge. Vacuum degree range tests, the aeration rate range tests, and the influencing factors of sludge dewatering behavior tests were conducted with a self-developed SDAV model test device. Sludge samples were taken from the South-to-North Water Diversion East Line Project in Huai’an White-Horse Lake disposal site, Jiangsu Province, China. The optimal range of vacuum degree and aeration rate were obtained through the test results, and the mechanisms for how the two factors work and how they affect the sludge dewatering behavior were analyzed. The suitable vacuum degree range in SDAV is below 50 kPa, and the suitable aeration rate is about 1.0 m3/h. The low-vacuum degree contributes to reduce the ad-sorption effect of micro-channels on soil particles in filter material and to maintain the arch structures. Aeration has the effects of expansion, disturbance, changing Reynolds number, and dynamic sieve separating. The pump quantity of water per meter of filter tube (m) has different change rules as the vacuum degree changes under different aeration rates. The reason is that the formed arch structures’ conformation and permeability differ greatly under different combined-conditions of vacuum degree and aeration rate. The optimal combined-condition for dewatering the sludge is 35 kPa with 1.0 m3/h. 相似文献
13.
Linguistic subjectivity is pervasive in almost all the utterances.Language without speaker’s affect,judgment and view point doesn’t exist.Idioms constitute one important part of the language and culture.Knowing a language includes knowing idioms in that language.Variation is one important aspect to idiom.Different from ordinary phrases,idioms tend to be frozen in form and meaning and don’t allow change in structure and meaning.However,variation is one important aspect to idiom.The words of some idioms can be moved orsubsti tuted by other words.The syntactic structure of idioms can be altered.Some idioms function as normal sequence of grammatical words.They have changes in tense and aspect.All these changes contribute to the creation of idiom variation.Speakers create new idiom out of the original ones by modifying the original idiom to convey extra meanings.Idiom variations are the results of people’s creative use of language. 相似文献
14.
Muhannad Al-Shboul 《美中教育评论》2011,(2):220-232
Given the increased adoption of the CMS （course management systems） as an instructional tool, it is important to address the potential use of this technology in Jordanian higher education institutions. This study investigates the potential to use CMS tools in instruction in the academic institutions in Jordan. This study does not seek to evaluate the current use of computer mediated tools or their features in instruction. Its purpose is to investigate what is currently taking place with CMS in higher education settings. Therefore, the study does not seek to determine the value that the use of the CMS tools may have contributed to instruction, however, it identifies the level of technology integration as well as the level of the technology use in higher education and problems associated with its use among the faculty. This study identifies prevalent faculty attitudes and perceptions toward the potential use of CMS tools in higher education institutions, in general, and in Jordan, in particular. 相似文献
15.
In Chinese and western culture,color words are both as many as the sands in the Ganges river and stars in the blue sky.And its meanings have something in common and also something that is different.To find out the same points and differentias and to avoid mistakes in intercommunication,the writer will analysis the meanings of some main color words and makes an explain for the differences from the aspect of culture between Chinese and western countries by the means of comparison and analysis.After the analysis,the writer discovers that the meanings of the colors are basically different except the purple,and which are deeply affected by their each culture.And the meanings of them would change in the situation of intercommunication.Therefore,we should use these words properly. 相似文献
16.
Increasing accountability and efficiency in the use of public and out-of-pocket financing in education are critical to realizing the maximum impact of the meager allocations to education in most developing countries. While broad estimates and numbers are routinely collected by most national ministries and state departments of education, the lack of accuracy and reliability as well as the obtuse nature of recording and presentation of the data does not facilitate any serious policy use. A major advance in this area has been brought about by the development of NEA （National Education Accounts）, which is a new tool for measuring education expenditures in a systematic policy-~endly manner. In essence, NEAs measure the ＂financial pulse＂ of an education system, answering 4 key questions： Who is financing education？ How much do they spend？ How are funds distributed across different education providers, levels and activities？ Who benefits from or receives the services？ NEAs gather information on all spending from public, private and donor sources, and provide a snap-shot of all expenditures on education in the state or country. While not an auditing tool, it provides real time information on the flow of funds that can be used for evidence-based decision-making. It provides information to policy-makers, enabling them to discern systcm-wide inequities and identify areas that require changes in policy. In addition, the use of a standard classification of expenditures allows for data from NEAs to be comparable between and within countries. This paper provides an assessment of accountability and efficiency in the use of public and private resources in the education sector in 2 states of Nigeria. Using comparative data from implementation of education accounts in 2 states of Nigeria, it presents a breakdown of education spending by public and private sources as well as donor agencies, by types of providers, by geographical regions and by category of expenditures. It analyzes educational expenditures for the 2 states in the context of state government priorities for education, and proposes a novel way of tracking trends in education spending as a means for policy-makers to organize a strategic vision supported by resources and to evaluate the outcome of policies. 相似文献
17.
Business letter with friendly modality is an effective means to represent the best advantage of one’s self and firm. The paper in vestigates modality in business letter according to Halliday’s view on modality. The modal devices mainly cover modal operator, modal ad junct, and modal cohesion. By means of binary approach modal logic is tentative divided into: perfective and imperfective; positive and neg ative; subjective and objective or explicit and implicit; high, median and low value. Modal devices or modal logic has formal and semantic level. Modality is regarded as a potential analyzing method to business text in this paper. The significance of the study is for understanding modal expression in business letter, meanwhile, this is a way to better understand modal logic, and to better use modal device in business let ter. 相似文献
18.
Linguistics is a necessary course for English-majors because it plays an important role in second language learning, teaching and research. It is significant, yet difficult to make this course comprehensible and interesting and get the students involved in and attracted by it. This paper intends to analyze and explore teachers’ roles in the course of linguistics from the following aspects: as an explainer, as an activator, as a co-learner, as a question-finder and as an enabler. Some examples are taken to show how to make use of comparison, contrast, instance, discussion, and practice for classroom management. What’s important for a teacher of linguistics is not only to understand linguistic theories and carry on linguistic research by him- or herself, but also to make his or her students get to know the nature of language and learn to do scientific studies of language by themselves. 相似文献
19.
Silence,as a type of non-verbal communication,expresses special meanings of the speakers.The core of this study is focused on the functions of silence in conversations from the famous American TV series Prison Break(Season I),in order to reveal that silence,as an important tool in human communication,has richness of meaning and complexity of use. 相似文献
20.
Autonomous study emphasizes the learner’s initiative,enthusiasm and creativity.In all fields of education,there is growing emphasis on "learner-centered" teaching methods and the ability of learner autonomy.Many experts and scholars have found that learning strategies plays an important role in English language learning,but the importance of affective strategy use in English learning is often ignored by people.Therefore,this paper focuses on the frequencies of affective strategies use in English learning and their relationships so as to enable college students to use positive affective strategies effectively to improve their autonomous learning ability. 相似文献