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An approach to establish a soil environmental assessment model was proposed to evaluate the soil environmental quality level. The kriging technique and a self-organizing map (SOM) were integrated to investigate the soil environmental quality in a geographic information system (GIS). In this study, SOM was applied to categorize the data set of nine heavy metals in topsoil. A total of 261 topsoil samples...
Spatial distributions of soil Zn concentration in three horizontal soils in Guangdong, China, were surveyed and analyzed using geostatisitic and GIS. A total of 260 soil profiles data followed an approximately lognormal distribution. The Zn geometric mean concentration of 38.4 mg/kg in surface soils is higher than that in global soils. From A- to C-horizon Zn geometric mean concentrations had an increasing...
This paper has gone through the researches and practical progresses of information service transformation in China in the way of documentation analysis. Based on the contents of information service environment, information service organization, information service mode and information service strategy etc. it has summarized the already got achievements and made further thinking. So, in this paper,...
This paper applied literature investigation method to collect documentaries from different areas related to information service institution design, service management, operating mechanism, international communication and cooperation etc. It has tracked the directions of research and got to know the experts and scholars research perspective and research progress. With a comprehensive studying on the...
Based on the research of virtual community service positioning in academic libraries, this paper selected the interest community as main type in construction. In virtual community construction, the key question we must face is the qualitative determination and quantitative calculation of userspsila similarity relationship. The solution to this problem mainly includes two stages: the acquiring of userspsila...
Guided by the requirement changing of innovation, every country is frequently adjusting development strategy to reconstructing the information service. This paper takes the method of document analysis to study the research and practice of information service transformation in different countries and find the concerns of scholars and the trend of modern information service industry development. Objectively...
Web-based learning community allow educators to study how students learn (descriptive studies) and which learning strategies are most effective (causal/predictive studies). Since Web-based learning community are capable of collecting vast amounts of student profile data, data mining and knowledge discovery techniques can be applied to find interesting relationships between attributes of students,...
Guided by the requirement changing of innovation, every country is frequently adjusting development strategy to reconstructing the information service system. This paper comprises the industrial information service organization and management mode with United States, EU, Japan, and Russia, and analyses the advantage and problems in Chinapsilas industrial information service system reform. Facing these...
The distance education has tended to cyberization, and how learners study in a collaborative way becomes a key issue. This paper presented a learning communities algorithm based on interest similarity, which can cluster learners with similar interests into the same community and help then collaborative learn. The experiments show that this mechanism can improve efficiency and scalability.
The particle swarm optimization is a stochastic, population-based optimization technique. A modified PSO algorithm is proposed in this paper to avoid premature convergence with the new select mechanism. This mechanism is simulating the principle of molecular dynamics, which attempts to activate all particles as the most possible along with their population evolution. Two stopping criteria of the algorithm...
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