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Search Results: 1 - 10 of 1714 matches for " Yau-yuen YEUNG "
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The science assessment in the National Assessment of Educational Progress (NAEP) of USA
Helan WU,Yau-yuen YEUNG,May-hung CHENG
Asia-Pacific Forum on Science Learning and Teaching , 2008,
Abstract: This article provides a brief review on the science assessment in the National Assessment of Educational Progress (NAEP) of USA in the last decade (1996, 2000 and 2005). It focuses on some key elements of the assessment framework and assessment criteria of NAEP and critically examines certain assessment items as selected from those three rounds of assessment exercise. Besides, there is a concise analysis on the educational implications of NAEP.
Implications of Data-logging on A.L. Physics Experiments:A Preliminary Study
Pun-hon NG,Yau-yuen YEUNG
Asia-Pacific Forum on Science Learning and Teaching , 2000,
Abstract: The current trend of computer-mediated learning probably implies that data-logger will become an important apparatus in the secondary school physics experiments in Hong Kong. This preliminary study reports and discusses the findings from a trial set of A.L. physics data-logging activities in a secondary technical school.
An alternative Chinese input method for Science education
Yau Yuen YEUNG
Asia-Pacific Forum on Science Learning and Teaching , 2000,
Abstract: This article describes an alternative Chinese computer input method which can be mastered in five minutes and the procedures for installing it in the Microsoft Chinese Windows system. This input method tool can perform English to Chinese translation of common science vocabularies and it is also embedded with the Simple input method.
From changes in education system to curriculum reform: A critique of the new Hong Kong senior secondary science curriculum
Yeung Chung LEE,Chung Man LAM,Yau Yuen YEUNG
Asia-Pacific Forum on Science Learning and Teaching , 2010,
Abstract: The new Hong Kong senior secondary science curriculum will be implemented in 2009. The curriculum change was induced by the change in the education system, but its meaning will go far beyond matching the curriculum with the new system. It intends to remove the limitation of the existing curriculum, and to enlighten it with essential elements of contemporary science education. It transcends subject boundary to establish a new integrated subject, and extends the scope of student assessment such that both teaching and assessment will become more diversified. This article analyses the characteristics of this curriculum reform and its forces behind, and comments on the advantages and challenges it create.
Analytical Solutions to the Navier-Stokes Equations with Density-dependent Viscosity and with Pressure
Ling Hei Yeung,Manwai Yuen
Physics , 2009, DOI: 10.1063/1.3197860
Abstract: This article is the continued version of the analytical solutions for the pressureless Navier-Stokes equations with density-dependent viscosity in "M.W. Yuen, Analyitcal Solutions to the Navier-Stokes Equations, J. Math. Phys., 49 (2008) No. 11, 113102, 10pp". We are able to extend the similar solutions structure to the case with pressure under some restriction for $\gamma$ and $\theta$.
Line Solutions for the Euler and Euler-Poisson Equations with Multiple Gamma Law
Ling Hei Yeung,Manwai Yuen
Physics , 2010,
Abstract: In this paper, we study the Euler and Euler-Poisson equations in $R^{N}$, with multiple $\gamma$-law for pressure function: \begin{equation} P(\rho)=e^{s}\sum_{j=1}^{m}\rho^{\gamma_{j}}, \end{equation} where all $\gamma_{i+1}>\gamma_{i}\geq1$, is the constants. The analytical line solutions are constructed for the systems. It is novel to discover the analytical solutions to handle the systems with mixed pressure function. And our solutions can be extended to the systems with the generalized multiple damping and pressure function.
Analytical Solutions to the Navier-Stokes-Poisson Equations with Density-dependent Viscosity and with Pressure
Yeung Ling Hei,Yuen Manwai
Physics , 2010, DOI: 10.1090/S0002-9939-2011-11048-7
Abstract: We study some particular solutions to the Navier-Stokes-Poisson equations with density-dependent viscosity and with pressure, in radial symmetry. With extension of the previous known blowup solutions for the Euler-Poisson equations / pressureless Navier-Stokes-Poisson with density-dependent viscosity, we constructed the corresponding analytical blowup solutions for the Navier-Stokes-Poisson Equations with density-dependent viscosity and with pressure.
Minimizing atomic configurations of short range pair potentials in two dimensions: crystallization in the Wulff shape
Yuen Au Yeung,Gero Friesecke,Bernd Schmidt
Mathematics , 2009,
Abstract: We investigate ground state configurations of atomic systems in two dimensions interacting via short range pair potentials. As the number of particles tends to infinity, we show that low-energy configurations converge to a macroscopic cluster of finite surface area and constant density, the latter being given by the density of atoms per unit volume in the triangular lattice. In the special case of the Heitmann-Radin sticky disc potential and exact ground states, we show that the macroscopic cluster has a (unique) Wulff shape. This is done by showing that the atomistic energy, after subtracting off a bulk part and re-scaling, Gamma-converges to a macroscopic anisotropic surface energy.
Planar scintigraphy in assessment of mandibular asymmetry: Unilateral condylar hyperplasia vs asymmetric mandibular hyperplasia  [PDF]
Lo John, Yau Yat Yin, Yeung Wai Chow David, Cheung Lim Kwong
Journal of Biomedical Science and Engineering (JBiSE) , 2012, DOI: 10.4236/jbise.2012.512A106

Objectives: To 1) explore the planar scintigraphic findings in asymmetry patients caused by unilateral condylar hyperplasia (UCH) or asymmetric mandibular hyperplasia (AMH); 2) develop a local agecondylar activity reference norm; and 3) check the accuracy of the new norm and compare with other analytical methods. Material and Method: Chinese patients with mandibular asymmetry and scintigraphic findings available were recruited. Clinical, radiographic records and scintigraphic condylar activity ratio (CAR) were studied. Regression analysis was performed to quantify the relationship between age and CAR to develop a new norm. The sensitivity of condylar activity assessment using a) traditional norm; b) new norm; and c) percentile difference was compared. In patients with serial data available, longitudinal analysis of the scintigraphic changes were checked. Result: 109 patients were eligible for the study. Significant difference in CAR was noted between UCH and AMH patients. Linear relationship was observed between age and CAR. A new norm of the age-CAR was established, which showed improved sensitivity in condylar activity prediction in UCH and AMH when compared with traditional norm. Relative to percentile difference, the sensitivity of new norm was lower in AMH but not in UCH patients. Serial analysis revealed gradual decline in CAR with minimal change in percentile difference. Conclusion and Clinical Relevance: There is difference in scintigraphic condylar activity between UCH and AMH patients. A norm of age-CAR relationship was established, which showed improved sensitivity in condylar activity prediction in UCH patients. Further study is required to confirm the role of scintigraphy in AMH.

Pharmacogenomics and the Yin/Yang actions of ginseng: anti-tumor, angiomodulating and steroid-like activities of ginsenosides
Patrick Yue, Nai Mak, Yuen Cheng, Kar Leung, Tzi Ng, David Fan, Hin Yeung, Ricky Wong
Chinese Medicine , 2007, DOI: 10.1186/1749-8546-2-6
Abstract: Angiogenesis in the human body is regulated by two sets of counteracting factors, angiogenic stimulators and inhibitors. The 'Yin and Yang' action of ginseng on angiomodulation was paralleled by the experimental data showing angiogenesis was indeed related to the compositional ratio between ginsenosides Rg1 and Rb1. Rg1 was later found to stimulate angiogenesis through augmenting the production of nitric oxide (NO) and vascular endothelial growth factor (VEGF). Mechanistic studies revealed that such responses were mediated through the PI3K→Akt pathway. By means of DNA microarray, a group of genes related to cell adhesion, migration and cytoskeleton were found to be up-regulated in endothelial cells. These gene products may interact in a hierarchical cascade pattern to modulate cell architectural dynamics which is concomitant to the observed phenomena in angiogenesis. By contrast, the anti-tumor and anti-angiogenic effects of ginsenosides (e.g. Rg3 and Rh2) have been demonstrated in various models of tumor and endothelial cells, indicating that ginsenosides with opposing activities are present in ginseng. Ginsenosides and Panax ginseng extracts have been shown to exert protective effects on vascular dysfunctions, such as hypertension, atherosclerotic disorders and ischemic injury. Recent work has demonstrates the target molecules of ginsenosides to be a group of nuclear steroid hormone receptors. These lines of evidence support that the interaction between ginsenosides and various nuclear steroid hormone receptors may explain the diverse pharmacological activities of ginseng. These findings may also lead to development of more efficacious ginseng-derived therapeutics for angiogenesis-related diseases.Ginseng, Panax ginseng C.A. Meyer, a precious Chinese traditional medicinal herb, has been known clinically used in China for thousands of years. The genus name 'Panax' was derived from Greek. 'Pan' means 'all' and 'axos' means 'cure'. Literally 'Panax' can be translated
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