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The Internet technology maturity, the fast influence our life, is not having the national boundary, not time, region limit network characteristic, also changed the school edition traditional teaching way, the teaching from the classroom, the school, extends to the Internet, studies is not restricted in the same time and the same learning environment. Along with e-learning¡¦s development, the teaching material more and more multi-dimensional, but those material restricted by the learning platform, the teaching material itself exchangeability also reduces along with it. In this thesis, a learning content management system (LCMS) based on SCORM (sharable content object reference model) which shares learning object by Web Service is proposed. The whole system can be divided into four subsystems. Learning object management subsystem manages learning objects and those metadata. Content Upload subsystem provides the functionality of converting ordinary files to learning objects and parse SCORM content into the system. Content authoring subsystem assembles these objects to form abigger learning object or a courseware. Content provider can share learning objects by web-service searching subsystem. Users can use content authoring subsystem to construct new learning contents, and web-service searching subsystem to search and share learning objects easily.

In this thesis, we will discuss that GaN template which was grown on the sapphire by metal organic vapour phase epitaxy (MOVPE). Then GaN epi-layer, intrinsic AlGaN (as spacer) and N-type AlGaN(doping Si) which offers carrier grow by molecular-beam epitaxy. We changed the content of aluminium to find out any difference on AlGaN/GaN heterostructure . For our experimental, we tried our best to keep all the parameters in steady besides the vapor of aluminum. If the vapor of aluminum every 4.65*10-9 torr is set to be one unit, then ratio of the pressure from sample A to E is 0.5, 1.0, 1.5, 2 and 3. We can get the best growth parameters by hall measurement, reflection high-energy electron diffraction, scanning electron microscope, atomic force microscopic and X-ray diffraction analysis to improve the quality of the sample. From scanning electron microscope and reflecting high energy electronic diffraction picture, the roughness of all samples is good which confirms that the samples should be in two-dimensional (2D) growth mode. We can find the same result by atom force microscope. After comparing 3D picture, we find out the surface of Sample B is the smoothest, meanwhile the roughness is 1.404 (nm) has been calculated through the functions. Due to Hall measurement in 77 K, the electron mobility of this series of samples are very high, especially Sample C is 10995(cm2/Vs) and sample D is 10697 (cm2/Vs) respectively. Quite narrow Full Width at Half Maximum(FWHM) of AlGaN which is about only 300 (arcsec) has been showed under the analysis of X-ray in rocking curve mode and these results indicate these samples have extraordinary qualities better than previous one.

Purpose and benefit of CMS. Roles and design variants. Commercial vs. Open Source. XSLT based CMS approach. / Workshop Mensch-Computer-Vernetzung Zweck und Nutzen von CMS. Rollen und Designvarianten. Kommerziell vs. Open Source. CMS-Ansatz auf XSLT-Basis.

Thesis (Ed. D.)--Washington State University, December 2009. / Title from PDF title page (viewed on Dec. 28, 2009). "Department of Teaching and Learning." Includes bibliographical references (p. 96-110).

Thesis (M.A.)--California State University, Chico. / Includes abstract. Includes bibliographical references (p. 63-65).

Thesis (M.A.)--Miami University, Dept. of Psychology, 2003. / Title from first page of PDF document. Document formatted into pages; contains iii, 50 p. Includes bibliographical references (p. 36-38).

Thesis (M. Phil.)--University of Hong Kong, 2010. / Includes bibliographical references (leaves 153-170). Also available in print.

The purpose of this qualitative study was to examine the developmental process of pedagogical content knowledge (PCK) among experienced science teachers. Since teaching is a "learned profession" (Shulman, 1987) centered on a unique set of knowledge, PCK becomes a critical avenue to investigating the roots of effective teaching. Research suggests that PCK develops and grows through classroom practice (Lederman, Gess-Newsome, & Latz, 1994; van Driel, Verloop, & de Vos, 1998; van Driel, De Jong, & Verloop, 2002). In addition, teacher efficacy has been argued to be an "affective affiliate" of PCK (Park, 2007) indicating an association between empowered teachers and knowledge growth. Therefore, this study examined the role of teacher efficacy in sustaining PCK growth among experienced teachers to better comprehend the mechanism of action of classroom teaching experience. This collective case study involved three experienced high school science teachers who have been teaching for at least eight years. Data collection involved the use of classroom observations coupled with teacher interviews. In addition, instruments used in data collection included the use of the CoRe/PaPeRs (Content Representation/Pedagogical and Professional Experience Repertoires) template for validating PCK episodes (Loughran, Mulhall, & Berry, 2004; Loughran, Berry, & Mulhall, 2006) as well as the Science Teaching Efficacy Belief Instrument (STEBI) that was used to evaluate efficacy levels. Data analysis indicated teacher efficacy plays a pivotal role in developing PCK through a system of validation and evaluation of the teacher's cognitive belief structure. Furthermore, it was determined that as teachers gain classroom teaching experience, their sustained PCK growth is the result of increasing their knowledge of student understanding. / text

Block copolymers containing pendant pyrene, terpyridine and poly(3- hexylthiophene) moieties with different block ratios and chain lengths were synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization. The block copolymers obtained had narrow molecular weight distribution. The applications of these polymers for non-covalent functionalization of carbon nanotubes and in photovoltaic devices were studied. The molecular weight distribution and block sizes of the block copolymers could be controlled quite well. The polydispersities measured were below 1.25. The block copolymers could be functionalized on the surface of CNTs. The functionalized CNTs had an improved dispersing ability and a maximum dispersing ability of 0.30 mgmL-1 in DMF was achieved. The photosensitizing properties of an individual functionalized CNT were studied by conductive atomic force microscopy. In the presence of the photosensitizing unit, the photocurrent was measured to be 6.4 nAμW-1 at 580 nm. This suggests the role of metal complexes in the photosensitizing process in the block copolymer. Poly(3-hexylthiophene)-block-pendant pyrene copolymers were synthesized by Grignard metathesis and RAFT polymerization. Different loadings of the block copolymers functionalized CNT were employed as the electron accepting materials in bulk heterojunction photovoltaic devices. A maximum power conversion efficiency of 0.77 × 10-3 % was achieved for the poly(3- hexylthiophene): 0.5% polymer functionalized CNT devices. The poor efficiency was attributed to the low CNT loadings that limited the electron transport in the devices. The poly(3-hexylthiophene)-block-pendant pyrene copolymer were employed as compatibilizer for poly(3-hexylthiophene): [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) bulk heterojunction photovoltaic devices. With the addition of 20 % of the block copolymer, a maximum power conversion efficiency of 1.62 % could be achieved. The long term stability of the encapsulated photovoltaic devices was studied. There was more than 30 % reduction in the degradation of performance after 30 days when the block copolymer was added as compatibilizer. These results suggested the role of the block copolymer compatibilizers in improving both the photovoltaic performances and stability of the devices. Differential scanning calorimetry results suggested that the improved photovoltaic performances may be attributed to the enhanced compatibility between poly(3- hexylthiophene) and PCBM. / published_or_final_version / Chemistry / Doctoral / Doctor of Philosophy