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Search Results: 1 - 10 of 77170 matches for " Yan Wu "
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The Application of Two Different Types of Context in the Teaching of an Undergraduate Course  [PDF]
Yan Wu
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.42002

We address the question of how natural learning context and application of visual materials can positively affect the student learning. After discussing theory, we report an application of natural learning context and application of visual materials in the teaching of a recent undergraduate preservation course. In this study, the research questions addressed are: 1) What are the differences between a natural learning situation and a conventionally designed learning situation? 2) How does this difference affect a learner? 3) Why the follow-up activities and application of visual resources are beneficial? This study also points out the function of emotions in cognitive process and adopts the view that all representations arise with the contingent of a context in which emotions are implied, activated, and experienced.

Determination of inter- and intra-subtype/species varia-tions in polymerase acidic protein from influenza A virus using amino-acid pair predictability  [PDF]
Shaomin Yan, Guang Wu
Journal of Biomedical Science and Engineering (JBiSE) , 2009, DOI: 10.4236/jbise.2009.24041
Abstract: The polymerase acidic protein is an important family of proteins from influenza A virus, which is classified as many different subtypes or spe-cies. Thus, an important question is if these classifications are numerically distinguishable with respect to the polymerase acidic protein. The amino-acid pair predictability was used to transfer 2432 polymerase acidic proteins into 2432 scalar data. The one-way ANOVA found these polymerase acidic proteins distinguish-able in terms of subtypes and species. However, the large residuals in ANOVA suggested a pos-sible large intra-subtype/species variation. Therefore, the inter- and intra-subtype/species variations were studied using the model II ANOVA. The results showed that the in-tra-subtype/species variations accounted most of variation, which was 100% in total for both inter- and intra- subtype/species variations. Our analysis threw lights on the issue of how to de-termine a wide variety of patterns of antigenic variation across space and time, and within and between subtypes as well as hosts.
Application of random walk model to fit temperature in 46 gamma world cities from 1901 to 1998  [PDF]
Shaomin Yan, Guang Wu
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.212174
Abstract: Very recently, we have applied the random walk model to fit the global temperature anomaly, CRUTEM3. With encouraging results, we apply the random walk model to fit the temperature walk that is the conversion of recorded tem-perature and real recorded temperature in 46 gamma world cities from 1901 to 1998 in this study. The results show that the random walk model can fit both temperature walk and real recorded temperature although the fitted results from other climate models are unavailable for comparison in these 46 cities. Therefore, the random walk model can fit not only the global temperature anomaly, but also the real recorded temperatures in various cities around the world.
Fitting of precipitation in 49 European capitals from 1901 to 1998 using random walk  [PDF]
Shaomin Yan, Guang Wu
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.36059
Abstract: Mathematical modeling of precipitation is an important step to understand the precipitation patterns, and paves the way to possibly predict the precipitation. In this study, we attempt to use the random walk model to fit the annual precipitation in 49 European capitals from 1901 to 1998. At first, we used the simplest random walk model to fit the precipitation walk, which is the conversion of recorded precipitations into ±1 format, and then we used a more complex random walk model to fit the recorded precipi-tations. The results show that the random walk models can fit both precipitation walk and re-corded precipitation. Thus this study provides a model to describe the precipitation patterns during this period in these cities.
Adaptation in polymerase basic protein 1 family from influenza A virus to climate change  [PDF]
Shaomin Yan, Guang Wu
Health (Health) , 2012, DOI: 10.4236/health.2012.430148
Abstract: Global climate changes affect the functioning of ecosystems, in particular host-pathogen interactions, with major consequences in health ecology, however, it is less addressed how the change in global temperature affects the protein family of influenza virus. In this study, we studied the adaptation of polymerase basic protein 1 (PB1) family from influenza A virus to temperature change. 3841 PB1 proteins sampled from 1956-2011 were quantified by the amino-acid pair predictability and then compared their general changes with the temperature changes (Had-CRUT3v and CRUTEM4v data sets) of corresponding years on a 5? by 5? grid-box basis. Also, point-to-point comparisons were conducted from 1956 to 1998 in all and different species. The results showed that both changes in the temperature and unpredictable portion of PB1 proteins had similar trends from 1956 to 2011, which provides the evidence of virus adaptation at protein level to climate change.
2-Dimensional HP Foldings of Dermaseptin-J2  [PDF]
Shaomin Yan, Guang Wu
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510B016

Although the hydrophobic-polar (HP) model is a simple model to study protein folding, it is an approximation to the real-life case. Dermaseptin is a subfamily of frog skin active peptide family, which has various antimicrobial activities, and dermaseptin-J2 is a newly found peptide composed of 26 amino acids. In this study, the 2-dimensional HP model was used to analyze the foldings of dermaseptin-J2 and its nine mutants, which were converted to different HP sequences according to the normalized amino acid hydrophobicity index with respect to pH levels and the conversion of glycine as hydrophobic or polar, and each has 847,288,609,443 possible foldings. The results show that the foldings with minimal energy have different native states, which are chiral and can be numerically distinguished and ranked according to the normalized amino acid hydrophobicity index. The nine mutants of dermaseptin-J2 do not affect the minimal energy but affect their native states at pH 7. The results demonstrate that two pH levels and conversion of glycine as hydrophobic or polar affect the native state and minimal energy, suggesting these are two ways to modify dermaseptin-J2.

The 4-Acyclic Edge Coloring of Graphs with Large Girths  [PDF]
Yuwen Wu, Yan Xia
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.312183
Abstract: A proper edge coloring of a graph is acyclic, if every cycle of the graph has at least 3 colors. Let r be a positive integer. An edge coloring is r-acyclic if it is proper and every cycle C has at least \"\"?colors. The r-acyclic edge chromatic ?\"\"?number of a graph G?is the minimum number of colors needed for any r-acyclic edge coloring of G. When r=4, the result of this paper is that the 4-acyclic chromatic number of a graph with maximum degree Δ and girth \"\"?is less than 18Δ. Furthermore, if the girth of graph G?is at least \"\", then \"\".
Applying Linear Controls to Chaotic Continuous Dynamical Systems  [PDF]
James Braselton, Yan Wu
Open Journal of Applied Sciences (OJAppS) , 2016, DOI: 10.4236/ojapps.2016.63015
Abstract: In this case-study, we examine the effects of linear control on continuous dynamical systems that exhibit chaotic behavior using the symbolic computer algebra system Mathematica. Stabilizing (or controlling) higher-dimensional chaotic dynamical systems is generally a difficult problem, Musielak and Musielak, [1]. We numerically illustrate that sometimes elementary approaches can yield the desired numerical results with two different continuous higher order dynamical systems that exhibit chaotic behavior, the Lorenz equations and the R?ssler attractor.
Stabilizing the Lorenz Flows Using a Closed Loop Quotient Controller  [PDF]
James Braselton, Yan Wu
Open Journal of Applied Sciences (OJAppS) , 2016, DOI: 10.4236/ojapps.2016.68056
Abstract: In this study, we introduce a closed loop quotient controller into the three-dimensional Lorenz system. We then compute the equilibrium points and analyze their local stability. We use several examples to illustrate how cross-sections of the basins of attraction for the equilibrium points look for various parameter values. We then provided numerical evidence that with the controller, the controlled Lorenz system cannot exhibit chaos if the equilibrium points are locally stable.
Urban Development and Water Management in the Yangtze River Delta  [PDF]
Yan Wang, Wei Wu
World Journal of Engineering and Technology (WJET) , 2018, DOI: 10.4236/wjet.2018.62B002
Throughout the history of the world, the development of the cities are related to the large water systems and the ocean. Where the river is abundant, the trade and regional centres could be formed. However, along with the prosperity of the water-cities, massive urban construction and environmental issues are enormous challenges in human process. A “scientific” urban planning, “Sponge City”, “Resilient City”, regional and urban culture and characteristics get more and more attention. The theme of “water and city” is clearly of great historical value and practical significance for the new resilient urban and water management strategies. The paper will summarize characteristics of geographical, historical, socio-cultural and political realms in metropolitan deltas and the historical governance as well as the recent developments in the Yangtze River Delta. It will introduce urban development and water management in four water cities: the canal and the city-Yangzhou, the river and the city-Nanjing, the lake and the city-Suzhou and the sea and the city-Shanghai. And then it will analyze the inner motivation of the interaction between water and cities in Yangtze River Delta. Furthermore, learning from successful historical experiences, the paper will provide suggestions for future sustainable urban development.
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