开源互动理念指引图书馆2.0研究——兼论图书馆2.0与个性化图书馆的结合

指出Web/Lib2.0的核心精神是"开源、互动",体现这一精神的图书馆2.0资源模式是具有微结构的微内容,实现这一模式的技术途径是需要一个图书馆2.0的X引擎,而具备个性化设计的宏服务则是图书馆2.0的服务形式,图书馆2.0与个性化图书馆的结合正是数字图书馆的发展方向。     

Exploring the interactive patterns of concept map-based online discussion: a sequential analysis of users’ operations,cognitive processing,and knowledge construction

Concept maps can be used as a cognitive tool to assist learners' knowledge construction. However, in a concept map-based online discussion environment, studies that take into consideration learners' manipulative actions of composing concept maps, cognitive process among learners' discussion, and social knowledge construction at the same time are still lacking. Therefore, this study employed lag sequential analysis to empirically explore learners' behavioral patterns in a concept map-based online discussion environment. We explored learners' operations in the concept map tool, and their discussion behavioral patterns of cognitive processing phases and social knowledge construction. The results showed that it was easier for learners to define a node than to define a relationship when they used the concept map. Additionally, the concept map can enhance higher level cognitive processing phases and lead learners to return to the main discussions from off-topic discussions significantly.     

Numerical study on the wrist action during the golf downswing

The purpose of this paper was to examine whether the ball position and wrist action (different types of torque application) could be optimised to increase the horizontal golf club head speed at impact with the ball. A two-dimensional double pendulum model of the golf downswing was used to determine to what extent the wrist action affected the club head speed in a driver, and how this affected the optimum ball position. Three different patterns of wrist actions (negative, positive, and negative-positive torque at the wrist) were investigated; and two criteria (maximum and impact criteria) were used to assess their effectiveness in terms of the maximum horizontal club head speed, and the club head speed as the shaft becomes vertical when viewed ‘face-on’. The simulation results indicated that the horizontal club head speed at impact could be increased by these patterns of wrist actions and the optimum ball position could be determined by the impact criterion. Based on the analysis of the energy flow from the input joints of shoulder and wrist to the arm and club head, the way the wrist action affects the club head speed has been discussed. The sensitivity of the results to small changes in model parameter values and initial conditions was investigated. The results were also examined under different torque patterns.     

Performance Versus Objective Testing and Gender: An Exploratory Study of an Advanced Placement History Examination

To explore a phenomenon of gender differences in Advanced Placement examinations, random samples of free-response test booklets were taken from the 1986 examination in U.S. History. These examinations were chosen because they consistently show significant gender differences in objective scores but no gender differences in free-response scores. A rescoring of the free responses was conducted that focused on their historical content. This rescoring was conducted by readers other than those who conducted the original scoring and involved tallies of specific historical points made, supporting evidence given, and factual errors. Ratings were also made of handwriting quality, neatness, and English composition quality of the free responses. Analyses conducted indicate that free-response tasks of the type examined may have inherent characteristics that reward English composition abilities, and that some females may compensate for inferior historical knowledge with superior English composition abilities.     

Capture zone of linear strategies in interception problems with variable structure dynamics

The paper considers planar interception engagements against maneuverable targets using a linearized kinematic model with constant velocities. Both the interceptor and the target have bounded controls and first-order linear dynamics. Due to the linearization, the duration of the interception is prescribed. The target dynamics is fixed, but the interceptor has variable structure dynamics, switching from one mode to another once during the engagement. For such engagements the capture zone of a given linear feedback control is constructed. Numerical examples demonstrate that proper change of the interceptor dynamic mode leads to an enlarged capture zone.     

Integrated or inclusive education versus interactive education: the need for a new model

ABSTRACT

In an attempt to stimulate informed and critical debate, the nature and pedagogical implications of ‘integrated education’ and the more recently proposed ‘inclusive education’ are examined, and an alternative model, described as ‘interactional education’, is proposed and evaluated. Because of the political and economic implications of these three approaches, it is suggested that the appropriate forum for discussion is one which is Pan‐European.     

Destruction of hexafluoroethane in a dielectric-packed bed plasma reactor

The destruction of hexafluoroethane （C2F6）, also known as R- 116, was investigated in a nonthermal plasma reactor packed with dielectric pellets. The effects of the feed gas composition and the input power on the destruction of C2F6 were examined. The feed gas composition was varied by changing the oxygen content, the argon content and the initial C2F6 concentration. An increased input power led to increased C2F6 destruction as a result of promoting the electron-molecule collisions to dissociate C2F6 molecules. The addition of argon to the feed gas greatly improved the C2F6 destruction by reducing the energy losses due to vibrational excitation and dissociation of N2 molecules, while the increases in the oxygen content and the initial C2F6 concentration decreased the destruction efficiency. The byproducts including CO2, CO, COF2, CF4, SiF4, NO2, and N2O were identified, and the destruction mechanisms were elucidated, referring to these compounds. The most abundant byproduct was found to be carbonyl fluoride （COF2）, indicating that it serves as an important medium to convert C2F6 into CO2. The energy requirement for the C2F6 destruction was in the range of 8.2-45.3 MJ/g, depending on the initial concentration.     

Neuromuscular,biomechanical, and energetic adjustments following repeated bouts of downhill running

Purpose:This study used downhill running as a model to investigate the repeated bout effect(RBE) on neuromuscular performance,running biomechanics,and metabolic cost of running.Methods:Ten healthy recreational male runners performed two 30-min bouts of downhill running(DR1 and DR2) at a-20% slope and 2.8 m/s3 weeks apart.Neuromuscular fatigue,level running biomechanics during slow and fast running,and running economy parameters were recorded immediately before and after the downhill bouts,and at...     

Re-reviewing item parameter equivalence in TIMSS 2015 from a sociocognitive perspective

Educational Assessment, Evaluation and Accountability - From a sociocognitive perspective, item parameters in a test represent regularities in examinees’ item responses. These regularities...