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Zhao D.C.,Hebei North University | Xie B.Y.,Zhangjiakou Vocational and Technical College
Applied Mechanics and Materials

Based on the knowledge management theory, social constructivist theory, the theory of team learning, object-oriented programming methods, from the student's learning characteristics and the technology platform and operating environment and etc., feasibility analysis and needs analysis are carried out. System design and development are becoming into the design goals of social, intelligence and humanity, the abstract factory design pattern to SQL Sever as a database service system are chosen to be used a number of key technologies, combined with intelligent, high-performance, full-featured search technology, efficient, general purpose, open-to-use Web-based course system are designed and developed. © (2013) Trans Tech Publications, Switzerland. Source

Xie B.Y.,Zhangjiakou Vocational and Technical College | Zhao D.C.,Hebei North University
Applied Mechanics and Materials

Objective The research of digital games characteristics and connotations are to explore creating favorable conditions of independent study; to analyze the learning motivation, learning activities and process, self-confidence, aesthetic ability of students during the activities of the digital game, to learn the impact of creativity.[Methods] Simulation, experimental teaching, the comparison of experimental and traditional teaching methods are used. [Results] The experiments show that the vast majority of learners on the digital game for learners to create learning conditions and elements, as well as to develop learners' abilities and have made a positive evaluation (M = 4.059, SD = 0.732). Endorsement or in favor of digital games very much are to improve their capacity for cooperation and autonomy which accounted for 93.6% and 78.2% respectively; endorsement or in favor of such an environment favorable to learning accounted for 78.4%; that the learning environment for students to learn positive emotions accounted for 95.8%; 87.1% of the test that the environment to cultivate their sense of learning. [Conclusion] Digital game provides the independent study of effective resources, environment, elements, activities and processes, but also contains the self-motivation to learn; digital game activities contributed to enhancing learners' self-confidence, aesthetic skills, creativity, help to lead to a research study of the learners; an effective way of learning is the integration of learning and entertainment. © (2013) Trans Tech Publications, Switzerland. Source

Xie B.Y.,Zhangjiakou Vocational and Technical College | Zhao D.C.,Hebei North University
Applied Mechanics and Materials

Objective This paper investigates new Web-based course content in the Network environment, the role of curriculum evaluation and significance, the evaluation methods, processes, and should adhere to the principles of the network. [Process and methods] The process and methods are compared with the traditional environment through experimental research, theoretical research and system analysis combined with the digital network environment, access to experimental control with a combination of survey methods. [Results] It focuses on teaching content, learning resources and resides among the contents of teaching strategies and learning strategies of evaluation, involving students, teachers, learning materials, online teaching support systems, learning support and service system in each part. evaluation of online courses plays a guiding role in guiding the design and development of online courses in the right direction; By analyzing the course of learning resources, learning process and its causes, we can determine its effectiveness, shortcomings, contradictions and problems and find out the reasons, ways and measures for improvements. Can improve the network quality of the course and optimize teaching. [Conclusion] Online course teaching evaluation of network can provide reliable protection and guidance function, and it is a strong fulcrum in the whole systems engineering courses and online teaching. © (2013) Trans Tech Publications, Switzerland. Source

Yang Y.,Hebei North University | Feng H.,Hebei North University | Zhang X.,Zhangjiakou Vocational and Technical College
Journal of Materials Science: Materials in Electronics

NaY(WO4)2:(Ho3+, Yb3+) phosphors were synthesized by microwave heating in an EDTA-mediated process. The samples were characterized by XRD, FT-IR, SEM, and fluorescence spectrophotometer. The XRD and FT-IR results show that the samples have the tetragonal phase. The SEM results show that obtained samples have octahedral morphology. ‘Oriented attachment’ and ‘Ostwald ripening’ play key roles in the formation of octahedrons. The UC emission spectra of NaY(WO4)2:(Ho3+, Yb3+) phosphors under 980 nm excitation show two intense bands corresponding to 5F4 + 5S2 → 5I8 and 5F5 → 5I8 transitions of Ho3+ ions. Based on the energy level diagrams of Yb3+ and Ho3+, as well as the results of power dependence of UC emission intensities, possible excitation path ways for different bands are deduced. The green and red UC emissions of NaY(WO4)2:(Ho3+, Yb3+) phosphors originate from the two-photon process. Also, the samples have good thermal stability. © 2014, Springer Science+Business Media New York. Source

Feng H.,Hebei North University | Yang Y.,Hebei North University | Zhang X.,Zhangjiakou Vocational and Technical College | Xu Y.,Hebei North University | Guan J.,Hebei North University
Superlattices and Microstructures

We synthesized Sr2SiO4:Eu3+ phosphors with spherical morphology by a spray-drying process. The obtained samples were characterized by XRD, SEM, and spectrophotometer. The XRD results show that samples have good crystallinity after the heat-treatment at 1150 °C. The higher temperature has no obvious influence on the crystallinity and will destroy the spherical morphology. The SEM results show that the phosphors are microspheres with size in the range of 0.8-2.1 μm when they were heat treated at 1050°C and 1150°C. The excitation and emission spectra of the samples indicate that Eu3+ ions doped into Sr2SiO4 host successfully. The Sr2SiO4:Eu3+ sample heat-treated at 1150°C has the highest emission intensity and the longest decay times. The results of this work indicate that the optimized heat-treatment temperature should be at 1150°C for Sr2SiO4:Eu3+ micro-spherical phosphors synthesized by the spray-drying process. ©2014 Elsevier Ltd. All rights reserved. Source

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