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排序方式: 共有365条查询结果,搜索用时 15 毫秒
81.
Xi Zhang Jorik Blaas Charl Botha Peter Reischig Alberto Bravin Joris Dik 《Journal of Cultural Heritage》2012,13(2):221-225
Computer tomography (CT) technology has greatly contributed to the feasibility and convenience of detecting and visualizing the internal material constitution and geometrical fabrication of museum artifacts. This paper presents a case study of 3D virtual reconstruction for the CT-acquisition-based study of a cultural heritage artifact. It documents the complete procedure, including the preprocessing, segmentation and visualization of the data by providing coarse interactive exploration and integrated high-quality renderings. A parallel aim achieved was to use open source tools and free software for segmentation and visualization, thus providing full transparency of the adopted methodology and 3D visualization methods, and a cost effective solution for ordinary CPU-based PC users. Furthermore, the challenges of the large data volumes involved have been addressed using preprocessing, a segmentation scheme and linked front-to-back management to keep interaction and high-quality rendering available, thus achieving corresponding demands. 相似文献
82.
College and university leaders have paid an enormous level of attention to one domain of alumni involvement: charitable giving.
In light of the decline of state support for higher education and the shrinking ability of families to pay for college, such
emphasis is understandable. However, this emphasis has blinded scholars and practitioners to understanding the important non-monetary
support roles played by college alumni. Drawing on data from a research extensive university, this study employs a sequential
mixed method design (focus groups and confirmatory factor analysis) to demonstrate that non-monetary support behaviors are
best understood through the distinct, but interrelated domains of political advocacy and volunteerism. Political advocacy
behaviors include contacting legislators, the governor’s office, local politicians and serving on a political action team,
while volunteer behaviors include mentoring new alumni, recruiting students, and participating in special events. The study
breaks ground for future research on alumni support for higher education, including strategies to recruit alumni volunteers
and advocates. 相似文献
83.
Building on previous work on “regulatory objectivity,” the paper examines recent translational research and cancer genomics to explore the bundle of scientific and regulatory activities that generate and manage the platforms at the core of clinical trials, the “gold standard” of clinical research and evidence-based medicine. In particular, the paper explores the activities of a chain of mediators within a seamless regulatory web characterized by the interaction of endogenous and hybrid regulatory activities that are neither hierarchical nor linear. We contend that a full understanding of the dynamics of regulation in the biomedical domain ought to consider this chain of mediations; that their analysis necessitates understanding the content of the practices they regulate; and that in addition to examining the interactions between different regulatory modalities, we need to pay attention to their development insofar as regulation, far from being mere routine, leads to the emergence of novelty by coproducing the entities it regulates. These activities include not only setting out the conditions that must be respected in order to produce reliable test results, but also the conditions that define the relations (within a clinical context) between the different components of diagnosis as well as the consequences of such relations on clinical judgment. This is why we cannot treat organizational practices as distinct from the content of bio-clinical activities. 相似文献
84.
Recumbent bicycles (RB) are high performance, human-powered vehicles. In comparison to normal/upright bicycles (NB) the RB may allow individuals to reach higher speeds due to aerodynamic advantages. The purpose of this investigation was to compare the non-aerodynamic factors that may potentially influence the performance of the two bicycles. 3D body centre of mass (BCoM) trajectory, its symmetries, and the components of the total mechanical work necessary to sustain cycling were assessed through 3D kinematics and computer simulations. Data collected at 50, 70, 90 110 rpm during stationary cycling were used to drive musculoskeletal modelling simulation and estimate muscle-tendon length. Results demonstrated that BCoM trajectory, confined in a 15-mm side cube, changed its orientation, maintaining a similar pattern across all cadences in both bicycles. RB displayed a reduced additional mechanical external power (16.1 ± 9.7 W on RB vs. 20.3 ± 8.8 W on NB), a greater symmetry on the progression axis, and no differences in the internal mechanical power compared to NB. Simulated muscle activity revealed small significant differences for only selected muscles. On the RB, quadriceps and gluteus demonstrated greater shortening, while biceps femoris, iliacus, and psoas exhibited greater stretch; however, aerodynamics still remains the principal benefit. 相似文献
85.
Twelve endurance athletes and six power athletes performed fatiguing isokinetic knee flexions/extensions. Isokinetic torque was recorded during the exercise. Isometric torque, cortisol and lactate responses, electromyographic (EMG) mean power frequency, average rectified value, and conduction velocity were analysed before and after the isokinetic exercise to determine correlations between electrophysiological variables and mechanical performances and/or blood concentrations of biomarkers in the two groups of athletes. The EMG variables were estimated from signals recorded from the vastus lateralis in both voluntary and electrically elicited isometric contractions. Power athletes recorded higher values than endurance athletes for the following variables: pre-exercise isometric maximal voluntary contraction (MVC), isokinetic MVC, rate of mechanical fatigue during isokinetic contractions, pre - post exercise variations and recovery times of conduction velocity and mean power frequency, and lactate concentrations. Moreover, conduction velocity overshooting was observed in endurance athletes during the recovery phase after exercise. The correlation analyses showed that the higher the rate of mechanical fatigue, the higher the lactate production and the reduction in conduction velocity due to the exercise. 相似文献
86.
Alberto Renieri 《Endeavour》1984,8(1):35-43
The generation of coherent synchrotron radiation using beams of relativistic electrons passed through magnetic undulators opens up tremendous scope for photochemistry in general and isotopic separation by laser in particular. Applications for plasma heating in Tokamak-type installations to trigger off the controlled nuclear fusion process are also conceivable. 相似文献
87.
In this preliminary review, the authors analyse the effects of privatisation on diversity in higher education (HE) systems by exploring the consequences of the establishment of HE Institutions by non-public organisations. The rising importance of privatisation in Europe (Western and transitional economies), Latin America, and Southeast Asia is analysed. Then follows detailed examinations of private-sector HE in countries representative of all these geographical areas to determine how far privatisation has stimulated diversity. The preliminary results indicate that in each case the private sub-sector has promoted limited and partial diversification. In general, though, the more recent private establishments, created to satisfy increasing demand for HE, have nonetheless focused predominately on teaching, have undertaken little, or no, research and appear to be of lower quality than the older institutions. The private sub-sector is characterised mostly by its low-risk behaviour, and a concentration on low-cost and/or safer initiatives. Public authorities must share at least a partial responsibility for some of the negative side effects of the development of private higher education. 相似文献
88.
89.
90.
Carlos Alberto Torres 《European Journal of Education》2015,50(3):262-279
This article focuses on the role of global universities and globalisations in an age of global interdependence and cosmopolitanism. Competing agendas that result from actions and reactions to multiple globalisations are considered in relation to global citizenship education. These agendas are crucial in understanding dilemmas of the local and the global in relation to education. Key emerging agendas are highlighted, including those of the hyperglobalisers, skeptics and transformationists. Three themes are central for this conversation, namely a) how multiple globalisations are impacting global life and academics, b) how networks have become privileged sites for global education, and c) the implications of globalisation and networks for global citizenship and global universities. 相似文献