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Search Results: 1 - 10 of 96970 matches for " Liang Chen "
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Review of the Book Children, Language, and Literacy:Diverse Learners in Diverse Times  [PDF]
Liang-Chen Lin
Creative Education (CE) , 2013, DOI: 10.4236/ce.2013.47A1007
Abstract:

This article is to review the book Children, Language, and Literacy: Diverse Learners in Diverse Times, published in 2009, by Celia Genishi and Anne Haas Dyson. This book aims to explore the central premise that “diversity is the norm” through examining classroom activities that unfold young children’s interaction and learning as well as teachers’ instructional design and strategies. It provides insights into diverse child-centered curricula where children’s flexibility and adaptability in literacy development are stressed. Key focuses throughout this book rest on various dialects of English, sociolinguistic flexibility, pedagogies, assessments, flexible and play-based curricula. As expected, this book would contribute to studies of early childhood literacy, language diversity, and bilingual education. Specifically, it would benefit intended audiences: teachers and educators of young children, particularly teachers working with English language learners, emergent bilinguals, and special needs learners.

Simulating the Seismic Response of Concentrically Braced Frames Using Physical Theory Brace Models  [PDF]
Liang Chen, Lucia Tirca
Open Journal of Civil Engineering (OJCE) , 2013, DOI: 10.4236/ojce.2013.32A008
Abstract:

The aim of this paper is to assess the accuracy of brace models formulated in Drain 2DX and OpenSees by comparing the simulated results with those obtained from experimental tests. Both, Drain 2DX and OpenSees rely on the physical theory brace model. In this study, experimental tests conducted on the behaviour of structural hollow section braces subjected to symmetric and asymmetric quasi-static cyclic loading were selected for calibrating the numerical model. In addition, the predicted failure strain parameter resulted from a proposed empirical equation as a function of slenderness ratio, width-to-thickness ratio and steel properties was used to define the low-cycle fatigue material that was assigned to model braces in OpenSees. It is concluded that both Drain 2DX and OpenSees brace models give a good prediction in terms of maximum tensile and buckling force, as well as interstorey drift. However, in Drain 2DX, the brace model is not able to replicate the out-of-plan buckling and the braced frame model cannot provide an accurate response when the system experiences highly nonlinear demand. To emphasise the differences in performance between Drain 2DX and OpenSees, the behaviour of a 4-storey concentrically braced frame with zipper bracing configuration, located in Victoria, BC, was investigated.

Roadbed Subsidence Mechanisms under the Driven of Penetration-Soak Coupling  [PDF]
Hongkai Chen, Dan Liang
Journal of Geoscience and Environment Protection (GEP) , 2017, DOI: 10.4236/gep.2017.52008
Abstract:
Roadbed subsidence is one of the main types of highway flood damage, the periodic fluctuation of the river water level and the softening of the subgrade soils by the river water immersion for a long time are the main inducement factors of the subgrade subsidence. Based on the theory of absorbing water infiltration in unsaturated soil, calculation formula of dynamic stability coefficient of subgrade is established by using the Swedish arc method. Example analysis shows that, soil roadbed suffers the water permeability-soak, road-bed’s stability reduce with the time, and leads to roadbed subsidence. Research results for improving roadbed subsidence water logging mechanism understanding level have a positive meaning.
The curvature of spectral energy distribution of blazars
Liang Chen
Physics , 2014, DOI: 10.1088/0004-637X/788/2/179
Abstract: The SED of blazars show significant curvature. In this paper, we study the curvature properties for a large sample of Fermi/LAT bright blazars based on quasi-simultaneous SED. Both SEDs of synchrotron and inverse Compton (IC) components are fitted by a log-parabolic law in log_v-log_vfv diagram. The second-degree term of log-parabola measures the curvature of SED. We find a statistically significant correlation between synchrotron peak frequency and its curvature. This result is in agreement with the theoretical prediction, and confirms previous studies, which dealt with single source with various epoch observations or a small sample. If a broken power-law is employed to fit the SED, the difference between the two spectral indexes (alpha2-alpha1) can be considered as a "surrogate" of the SED curvature. We collect spectral parameters of a sample blazars from literature, and find a correlation between the synchrotron peak frequency and the spectral difference. We do not find a significant correlation between the IC peak frequency and its curvature, which may be caused by complicated seed photon field. It is also found that the synchrotron curvatures are on average larger than that of IC curvatures, and there is no correlation between these two parameters. As suggested by previous works in literature, both the log-parabolic law of SED and above correlation can be explained by statistical and/or stochastic particle accelerations. Stochastic particle acceleration predicts a different slope of the correlation from that of statistical one, and our result seems favor stochastic acceleration mechanisms and emission processes. Some of other evidences also seem to support that the electron energy distribution (and/or synchrotron SED) may be log-parabolic, which include SED modeling, particle acceleration simulation, and comparisons between some predictions and empirical relations/correlations.
Downlink MBER Transmit Beamforming Design Based on Uplink MBER Receive Beamforming for TDD-SDMA Induced MIMO Systems  [PDF]
Sheng Chen, Lie-Liang Yang
Communications and Network (CN) , 2010, DOI: 10.4236/cn.2010.23022
Abstract: The downlink minimum bit error rate (MBER) transmit beamforming is directly designed based on the uplink MBER receive beamforming solution for time division duplex (TDD) space-division multiple-access (SDMA) induced multiple-input multiple-output (MIMO) systems, where the base station (BS) is equipped with multiple antennas to support multiple single-antenna mobile terminals (MTs). It is shown that the dual relationship between multiuser detection and multiuser transmission can be extended to the rank-deficient system where the number of users supported is more than the number of transmit antennas available at the BS, if the MBER design is adopted. The proposed MBER transmit beamforming scheme is capable of achieving better performance over the standard minimum mean square error transmit beamforming solution with the support of low-complexity and high power-efficient MTs, particularly for rank-deficient TDD-SDMA MIMO systems. The robustness of the proposed MBER transmit beamforming design to the downlink and uplink noise or channel mismatch is investigated using simulation.
Online Learning: Trends, Potential and Challenges  [PDF]
Rose Liang, Der-Thanq Victor Chen
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.38195
Abstract: This paper examines trends, potential and challenges in online learning. We consider 6 online learning trends and the issues associated with the trends. These include a one sided emphasis on the technology; physical versus online presences; formal face-to-face versus distance/workplace education; mono-versus multi-lingual online learning; open source versus proprietary software; and the open standard oxymoron. The potential of online learning include 4 factors of accessibility, flexibility, interactivity, and collaboration of online learning afforded by the technology. In terms of the challenges to online learning, 6 are identified: defining online learning; proposing a new legacy of epistemology-social constructivism for all; quality assurance and standards; commitment versus innovation; copyright and intellectual property; and personal learning in social constructivism. The authors contend the necessity of developing new ways of thinking to face the challenges relating to the development of online learning.
The Knowledge Base Development for the Web Content Accessibility Guidelines  [PDF]
Yui-Liang Chen, Limin Liu
International Journal of Intelligence Science (IJIS) , 2014, DOI: 10.4236/ijis.2014.41005
Abstract:

Web Content Accessibility Guideline (WCAG) proposed by Web Accessibility Initiative is the most recognized regulation in the world in evaluating the accessibility of web contents and is one of the W3Cdocumentations. Currently,the WCAG documents are maintained as a non-computable dictionary like resources. In this study, we proposed a methodology to develop an ontological knowledge base with rules for the WCAG 2.0. Two WCAG techniques in different groups of techniques are used to illustrate the creation of the knowledge base and their application programming interfaces. For demonstrating purpose, a web-based WCAG validation system is built. With the proposed knowledge base and interfaces, computer programs can decide whether certain web content satisfies a particular WCAG technique. In other words, the WCAG documents have been successfully trans-formed to a computable recourse. Such sharable knowledge base and programming interfaces can be embedded into any system requiring the WCAG knowledge.

Study on Brand Mismatching toward the Acquiring Enterprise Brand Dilution—Based on a Prospective of Construal Level Theory  [PDF]
Guangmin Zhai, Xinhong Liang, Haiquan Chen
Open Journal of Business and Management (OJBM) , 2016, DOI: 10.4236/ojbm.2016.43045
Abstract: During the cross-border mergers and acquisitions process, there are numerous factors that affect the brand evaluation of acquiring enterprise, one important factor is brand matching between acquiring and target enterprises. Experiments draw conclusions that dilution does exist and construal level can moderate the negative impacts. These findings warn Chinese managers that brand mismatching between cross-border M & A may dilute the brand of acquiring enterprises.
Selected Medicinal Herbs and Functional Peptides for Protection against Photoaging of the Skin  [PDF]
Yanshan Liang, Meiyin Wu, Yafei Chen
Journal of Cosmetics, Dermatological Sciences and Applications (JCDSA) , 2019, DOI: 10.4236/jcdsa.2019.91001
Abstract: Photoaging is an accelerating aging process of the skin due to prolonged exposure to UV from the Sun or other sources. Herbal extracts, natural compounds, and bioactive polypeptides have widely used in cosmetic agents for protection of the skin against photoaging. This mini review briefly summarizes topical use of selected most common medicinal herbs, naturopathic chemicals, and bioactive peptides examined for skin protection.
Ubiquitin-conjugating enzyme involved in the immune response caused by pathogens invasion  [PDF]
Liang Chen, Chen Cheng, Chunxia Zhang, Qin Yao, Ermi Zhao
Open Journal of Immunology (OJI) , 2013, DOI: 10.4236/oji.2013.33013
Abstract:

Ubiquitin-proteasome pathway (UPP) is a significant way of protein degradation and modification in eukaryotic cell and involved in a complex series of intracellular processes. As a key component in UPP, ubiquitin-conjugating enzyme (E2) plays an extremely important role in ubiquitin (Ub) transferring and substrate specific recognition. Abundant evidences have proved that UPP is involved in cells immune reaction caused by pathogens and the attendance of E2 has a significant effect on host cells and pathogen. This article presents an overview of the current research on E2s that is involved in immune response caused by viruses and bacteria.

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