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Search Results: 1 - 10 of 157899 matches for " Li Xu "
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Inspection on Reality of Kindergarten Teachers’ Educational Behaviors
—A Case Study in China

Jing Li, Xu Li
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.29048
Abstract: The research selects 20 kindergarten teachers in urban and rural areas in Chongqing as the samples and adopts time sampling observation method to investigate into kindergarten teachers’ educational behaviors from seven perspectives, i.e. education & teaching, participation into children’s activities, daily behavioral management, observation& monitoring, custody and emotional expression, teachers’ daily activities and teachers’ personal activities. Research results show that kindergarten teachers’ educational behaviors have improved better than before and become more and more reasonable. However, there are still some problems, such as excessive teaching and requirements, inadequate listening to children’s ideas and stimulation of their initiatives, low effectiveness of evaluation on children’s behaviors, excessive orders and interventions in daily management, inadequate emotional exchanges between teachers and children, insufficient care for children’s individual demands, etc.
Energy-Constrained Duty-Cycle Optimization for Wireless Implanted Communication Devices  [PDF]
Zhao Xu, Ye Li
E-Health Telecommunication Systems and Networks (ETSN) , 2012, DOI: 10.4236/etsn.2012.11002
Abstract: Energy minimization is an important goal in wireless implanted communication devices. In this context, a cross-layer method is used to optimize parameters in different layers of OSI model, but, there are still several challenges affecting the optimization algorithm. The first point is the accurate energy model, and the second point is the suitable channel model exclude traditional free space channel model. In this paper, we establish a system level accurate energy consumption model and build a suitable channel model for implanted communication devices; analysis the energy-constrained duty cycle optimization with a cross-layer method. Simulation results reveal that adaptive duty cycle to minimize the energy consumption of the wireless implanted communication system is implemented based on accurate energy consumption model and channel model. Simulation results show a good performance on energy saving.
Visualization Analysis of Multi-Domain Access Control Policy Integration Based on Tree-Maps and Semantic Substrates  [PDF]
Li Pan, Qian Xu
Intelligent Information Management (IIM) , 2012, DOI: 10.4236/iim.2012.45028
Abstract: The complexity of multi-domain access control policy integration makes it difficult to understand and manage the policy conflict information. The policy information visualization technology can express the logical relation of the complex information intuitively which can effectively improve the management ability of the multi-domain policy integration. Based on the role-based access control model, this paper proposed two policy analyzing methods on the separated domain statistical information of multi-domain policy integration conflicts and the policy element levels of inter-domain and element mapping of cross-domain respectively. In addition, the corresponding visualization tool is developed. We use the tree-maps algorithm to statistically analyze quantity and type of the policy integration conflicts. On that basis, the semantic substrates algorithm is applied to concretely analyze the policy element levels of inter-domain and role and permission mapping of cross-domain. Experimental result shows tree-maps and semantic substrates can effectively analyze the conflicts of multi-domain policy integration and have a good application value.
Research on the Anti-corona Coating of the Power Transmission Line Conductor  [PDF]
Ziqiang Xu, Ren Li
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B028
Abstract: An anti-corona method for the power transmission lines is proposed in this paper. The RTV coating is used as the anti-corona coating, which is spaying onto the surface of the wearing conductor. The corona characteristic of the conductor test was done, and the corona onset voltage increase after the spraying of the anti-corona layer, the corona loss in the same voltage decrease, which could prove the excellent effect of improving the corona characteristic of the conductor. This anti-corona method will have great prospect, based on the background of the construction of UHV power transmission lines.
The Influences of WTO Accession on China’s State-Owned Enterprises  [PDF]
Shanshan Li, Ningxiang Xu
Open Journal of Business and Management (OJBM) , 2015, DOI: 10.4236/ojbm.2015.32019
Abstract: Up to the present, nearly fourteen years have passed since China’s accession to WTO. Among the various impacts the accession may bring about, the one on State-owned Enterprises (SOEs) was most widely concerned due to their special characteristics and particular roles in Chinese economy, politics and society. This essay will briefly introduce the history of China’s SOE reforms and then summarize previous research to demonstrate the expected influences of the accession. Then privatization and removal of protective government policies will be examined in detail, followed by an evaluation of the effect of privatization.
A Study of the Structural Properties and Thermal Stability of Chitosanases EAG1 by Molecular Dynamics Simulations  [PDF]
Yueming Li, Jianchun Xu, Zhimei Xu
Journal of Biomedical Science and Engineering (JBiSE) , 2018, DOI: 10.4236/jbise.2018.1111026
Abstract: Chitosanases EAG1, a classical glycoside hydrolase from Bacillus ehimensis, is relatively unstable with higher temperature. This shortcoming seriously restricts its industrial application. Therefore, it is crucial to clarify the theoretical basis of thermo stability and to produce enzymes with high activity and stability. Using the structural modeling and molecular dynamical simulation, residues Leu84, Gly113, Asp116, Ala207 and Leu286 were believed to be the key residues for structural stability. Then the predicted residue Leu84 was mutated to ALA. It was shown that the L84A mutation can improve the thermal stability of chitosanases EAG1. Together with previous studies, mutations of G113C, D116C, A207C and L286C forms two sulfur bonds can change the thermal stability of EAG1. The results suggest that the thermal stability of EAG1 could be engineered by site-directed mutagenesis on the conserved residues. This protocol could be employed for improving thermal stability of other chitosanases EAG1.
Do Water Matrix and Particulate Buffering Capacity Affect the Rate and Extent of P Release?  [PDF]
Jinbo Zhao, Yingjun Xu, Li Xu, Qian Li
Journal of Water Resource and Protection (JWARP) , 2018, DOI: 10.4236/jwarp.2018.101004
Abstract: The aim of this study was to investigate the release of inorganic and organic phosphorus species from particles in rivers and estuaries during resuspension events such as storm, wind and tidal induced turbulence. To achieve this aim, laboratory beaker experiments were designed with autoanalyzer 3 (AA3). The study first investigates phosphorus equilibration in ultra-pure water (UHP) water, biotic river water and abiotic river water under short term and long term conditions. Then, three typical organic and inorganic phosphorus compounds were selected (orthophosphate, phytic acid (PTA) and β-D-glucose-6-phosphate monosodium salt (G-6-P)) to simulate the effect of addition input to river and estuaries in the time period of 150 h. The results show that in a turbulent river, dissolved inorganic phosphorus (DIP) and dissolved organic phosphorus (DOP) will reach equilibrium between the particulate matter and the water column within 24 h. Additional input of DIP or DOP to the river, has different effects to the river nutrients balance. The buffering capacity of the suspended particulate matter (SPM) plays an important role and behavior difference to the inorganic and various organic phosphorus compounds.
Water Quality Analysis of the Songhua River Basin Using Multivariate Techniques  [PDF]
Yang LI, Linyu XU, Shun LI
Journal of Water Resource and Protection (JWARP) , 2009, DOI: 10.4236/jwarp.2009.12015
Abstract: Multivariate statistical techniques, including cluster analysis (CA), principal component analysis (PCA), factor analysis (FA) and discriminant analysis (DA), were used to evaluate temporal and spatial variations and to interpret a large and complex water quality data sets collected from the Songhua River Basin. The data sets, which contained 14 parameters, were generated during the 7-year (1998-2004) monitoring program at 14 different sites along the rivers. Three significant sampling locations (less polluted sites, moderately polluted sites and highly polluted sites) were detected by CA method, and five latent factors (organic, inor-ganic, petrochemical, physiochemical, and heavy metals) were identified by PCA and FA methods. The re-sults of DA showed only five parameters (temperature, pH, dissolved oxygen, ammonia nitrogen, and nitrate nitrogen) and eight parameters (temperature, pH, dissolved oxygen, biochemical oxygen demand, ammonia nitrogen, nitrate nitrogen, volatile phenols and total arsenic) were necessarily in temporal and spatial varia-tions analysis, respectively. Furthermore, this study revealed the major causes of water quality deterioration were related to inflow of effluent from domestic and industrial wastewater disposal.
The Study on First-Aid Education of Disaster for Primary School Student in China  [PDF]
Min Zhang, Li Li Guo, Min Xu
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510B029

Objective:To investigate current status of school disaster education of primary school students and analyze potential causes and discuss how to establish a corresponding education mode. Methods:The questionnaires of disaster knowledge for Primary and middle school students were used in this study and a random sampling method was adopted for the research. Results:The primary school students maintained the high rate of disaster attention. 73% primary school students had pay attention to the occurrence of disasters; more than 75% primary school students were lack of knowledge on disaster prevention and mitigation and 58.5% students were not satisfied with school disaster education work. Conclusions:There was dislocation between the way and mode of school disaster education.It might improve the quality of the disaster education and expand the disaster education to promote the development of disaster education.

The Influence Factors of Collective Intelligence Emergence in Knowledge Communities Based on Social Network Analysis  [PDF]
Zhihong Li, Ya’nan Xu, Kexin Li
International Journal of Intelligence Science (IJIS) , 2019, DOI: 10.4236/ijis.2019.91002
Abstract: The advent of the age of Information shifts the environment we live in from off-line to on-line. The prospect of Collective Intelligence (CI) is promising. Based on this background, the aim of this paper is to discover the emergence mechanism and influence factors of CI in knowledge communities using the method of quantitative and qualitative analysis. On the basis of the previous research work, our model theorizes that the two dimensions of social network (i.e., interactive network structure and participant’s characteristics) affect two references of effectiveness (i.e. group knowledge production and participation of group decision). And this hypothetical model is validated with simulation data from “Zhihu” community. Our model has been useful since it offers some inspirations and directions to promote the level of CI in knowledge communities.
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