DSpace collection: 期刊論文

教師合作設計課程的困難－活動理論觀點

Thu, 23 Apr 2026 04:44:39 GMT

title: 教師合作設計課程的困難－活動理論觀點 abstract: 摘要： The purpose of this study is to identify the difficulties encountered when teacher teams collaborate in designing school-based integrative curriculum units. Conventionally, teachers are used to accomplish tasks by dividing things into subtasks instead of doing them together. Therefore, it is expected that they encounter difficulties while working on curriculum design collaboratively. Using Activity theory as a framework, this study aimed to identify disturbances and inner contradictions in teacher collaborative curriculum-making. Instead of relying merely on interview or observation data, dialogical data were collected in regular team meetings in a junior high school in New Taipei City. Two teacher teams, the green fair unit team and the classroom electricity device unit team, were examined using the framework of activity theory. Three contradictions were discovered: first, the meaning-making of team meetings: effective versus fatigue; second, individual responsibility versus collective ownership; and third, 其他題名： Journal of Educational Practice and Research 出版者：台灣: 臺北教育大學出版日期： 2013-06 出處： Jiao yu shi jian yu yan jiu = Journal of educational practice and research, 2013-06, Vol.26 (1), p.063-094 資源來源： Chinese Electronic Periodical Services (CEPS)_2025 識別號： ISSN: 1993-5633

Transport properties and segregation phenomena in vibrating granular beds

Thu, 23 Apr 2026 03:59:02 GMT

title: Transport properties and segregation phenomena in vibrating granular beds abstract: 摘要： Granular materials are common in daily life and in many industrial processes. Both fundamental research and industrial application studies are crucial for understanding the transport properties and segregation mechanisms of vibrating granular beds. One major related research topic is granular materials subjected to external vibration; such granular materials exhibit complex movement and Brazil nut segregation. Understanding the transport properties and the rising of an intruder immersed in granular materials is a challenge in granular flow research. This paper presents a review of transport properties and segregation phenomena in a vibrating granular bed, and discusses the relationship between transport properties and granular segregation. Furthermore, how the vibration conditions, liquid bridge force, bed height, surface roughness of granular materials, and a bumpy base of granular beds affect the transport properties, convection, and granular segregation are reported. The results indicate that the transport properties and segregation behavior are significantly influenced by the addition of small amounts of liquids and by the surface roughness and a bumpy base. Diffusive and convective motions are weakened as the base roughness increases, leading to a weaker Brazil nut effect. 其他題名： KONA 出版者： Hirakata-sh: Hosokawa Powder Technology Foundation 出版日期： 2016-01-01 出處： KONA Powder and Particle Journal, 2016, Vol.33, pp.109-126 資源來源： JSTAGE - Open Access 版權： 2016 Hosokawa Powder Technology Foundation 版權： Copyright Hosokawa Powder Technology Foundation 2016 識別號： ISSN: 2187-5537 識別號： ISSN: 0288-4534 識別號： EISSN: 2187-5537 識別號： DOI: 10.14356/kona.2016020

The influence of driving conditions on flow behavior in sheared granular flows

Thu, 23 Apr 2026 03:58:58 GMT

title: The influence of driving conditions on flow behavior in sheared granular flows abstract: 摘要： ► Slip velocity is reduced with the increase of the solid fraction. ► Granular temperature is larger with the opposite driving wall direction. ► Velocity gradient is the dominant parameter to influence granular temperature. Granular materials may behave like a solid, a liquid, or a gas, depending on the processing conditions. In this study, a two-dimensional annular shear cell was used to investigate the dynamic properties of granular flow when subject to varying driving conditions. The effects of different driving conditions on granular flow were examined by taking images of the motions of granular materials with a high-speed camera. Image processing technology and a particle tracking method were employed to measure velocity, slip velocity, local solid fraction, and granular temperature. The results show a gradual decrease in the velocity profile from the shearing boundary to the stationary wall when only the inner or outer wall rotates. The tangential velocity of granular materials is greater with only a rotating outer wall than with an inner wall rotating singly at the same velocity. The results also show that slip velocity increases in conjunction with wall velocity and decreases if the solid fraction is increased. This study also examined flow behaviors caused by rotating both walls, first in the same direction, and then in opposite directions. The results indicate that granular temperatures in a system with both walls rotating in opposite directions are higher than in a system with walls rotating in the same direction. 出版者： Kidlington: Elsevier Ltd 出版日期： 2012-11-01 出處： International journal of multiphase flow, 2012-11, Vol.46, p.22-31 資源來源： Elsevier ScienceDirect Journals 版權： 2012 Elsevier Ltd 版權： 2015 INIST-CNRS 識別號： ISSN: 0301-9322 識別號： EISSN: 1879-3533 識別號： DOI: 10.1016/j.ijmultiphaseflow.2012.06.003 識別號： CODEN: IJMFBP

The effects of particle density and interstitial fluid viscosity on the dynamic properties of granular slurries in a rotating drum

Thu, 23 Apr 2026 03:58:53 GMT

title: The effects of particle density and interstitial fluid viscosity on the dynamic properties of granular slurries in a rotating drum abstract: 摘要： Experiments were performed to measure the dynamic properties of granular matter in a slurry rotating drum. Five different fluid viscosities, including air and four different liquid viscosities with mixtures of water and glycerin, as well as three different particle densities were used in the experiments. In this study, the purpose was to quantify the effects of the particle density and fluid drag force in a granular system. Particle tracking velocimetry was employed to measure the dynamic properties. Both the velocity of particle and granular temperature were obtained by averaging the experimental data. The angle of repose and diffusion coefficient were also calculated. The results show that the granular dynamic properties are strongly affected by the operational parameters. The mean velocity, obtained by averaging the velocities of all particles will decrease with an increase of the fluid viscosity. The average granular temperature will also decrease with increasing fluid viscosity. Moreover, the dimensionless number related to the dynamic properties is also discussed in the present study. The dimensionless number G′, combined with the influence of the fluid viscosity, the acceleration of gravity, particle density and fluid density, are all used in this work. An increase of the dimensionless number G′ would cause the dimensionless dynamic angle of repose increase, and the dimensionless mean velocity, the dimensionless granular temperature and the dimensionless self-diffusion coefficient to decrease. [Display omitted] •The increase of the fluid viscosity causes an increase in the angle of repose.•The mean velocity will decrease with the increase of the fluid viscosity.•The average granular temperature will decrease with increasing fluid viscosity.•The diffusion coefficient increases with increasing particle density. 出版者： Amsterdam: Elsevier B.V 出版日期： 2014-01 出處： Powder technology, 2014-01, Vol.252, p.42-50 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2013 Elsevier B.V. 版權： 2015 INIST-CNRS 識別號： ISSN: 0032-5910 識別號： EISSN: 1873-328X 識別號： DOI: 10.1016/j.powtec.2013.10.034 識別號： CODEN: POTEBX