圆柱形GaAs/Al_xGa_(1-x)As量子环中类氢施主杂质态的电场效应

在有效质量近似理论下,利用变分法研究了外电场下圆柱形GaAs/Al_xGa_(1-x)As量子环中类氢施主杂质束缚能。讨论了施主杂质束缚能与量子环尺寸(径向厚度、高度)、杂质位置以及外电场间的变化规律。结果表明:随着量子环径向厚度(高度)的增大,中心施主杂质束缚能先增大后减小,显示有一极大值;施加的电场明显地改变了量子环中电子波函数的分布,导致施主杂质束缚能相应的改变;施主杂质束缚能随杂质位置的变化呈现出规律性。     

PF/EP/Nano-SiO2 composite paint for resistor

Phenolic resin(PF) and nano-SiO₂ were used to improve the curing property and high humidity resistance of epoxy resin (EP) and methyl nadic anhydride (MNA) resistor paint, respectively. Hydrogen bonds, formed between phenolic resin and nano-SiO₂ in alcohol, made nano-SiO₂ disperse easily in EP/MNA paint through phenolic resin without being treated by supersonic vibration. When the mass ratio of PF to EP in paint is 3:7, the formed composite paint film can be cured in 2 min at 170 °C. When the mass ratio of nano-SiO₂ to PF in paint is 3:100, the property of high humidity resistance of the composite paint is the best, meeting the requirement of varying ratio of resistance less than 0.1% after experiment on high humidity resistance. SEM analysis shows the surface of the composite paint film is smooth, glassy, tight and homogeneous, without acicular air holes.     

Effects of La^3＋on microwave dielectric properties of（Pb0.5Ca0.5）（Fe0.5Ta0.5）O3ceramics

This work investigated the microwave dielectric properties of A-site substitution by rare earth La3+in(Pb0.5Ca0.5)(Fe0.5Ta0.5)O3(PCFT) system.A single perovskite phase was obtained only when the doping content was 2%.Suitable La3+ doping improved microwave dielectric performances.Excessive La3+doping caused the formation of secondary phase,which resulted in the decreasing of permittivity εrand quality factor Qfvalues.Especially,when the doping content is 2%-5%,permittivity εrwas above 75 and Qfvalues were 6...     

Learning Together: The Student/Parent/Teacher Triad

This report contains an analysis of both quantitative and qualitative data on participant perceptions of the co‐production of learning. It constitutes a refinement of the working model of the triadic relationship between parents, students, and teachers which was the basis of previous reports (Coleman, Collinge, & Seifert, 1992; Coleman, Collinge, & Tabin, 1992; Coleman & Tabin, 1992; Coleman & Collinge, 1991). Given our earlier findings the focus in this paper is upon the theme of collaboration, which is emerging as one critical element in the relationships within the student/teacher/parent triad.

The analysis shows that there are sharp differences in perceptions of collaboration between different triad members. Collaboration between parents and students is perceived to be both strong and balanced in initiation. Teachers show little awareness of its strength. Collaboration between teachers and parents is perceived by both to be one‐sided; each party sees the other as unresponsive. It is invisible to students. Collaboration between students and teachers varies between classrooms, and seems to be based upon the teachers’ perception of student acceptance of responsibility; parents are very keenly aware of this collaboration where it exists. Classroom level differences are also strong; teacher attitudes and practices clearly determine the extent of collaboration.

In British Columbia parent and student attitudes towards classrooms and teachers are affected, sometimes strongly, by teacher practices of parent involvement. These attitudes contribute to parent and student rating of particular schools.     

Preparation of Cu/ZnO/Al2O3 catalysts in a solvent-free routine for CO hydrogenation

The synthesis of methanol and dimethyl ether (DME) from CO hydrogenation has been investigated on Cu-based catalysts. A series of Cu/ZnO/Al₂O₃ catalysts were prepared using a solvent-free routine which involved a direct blend of copper/zinc/aluminum salts and citric acid, followed by calcination at 450 °C. The calcination processes were monitored using thermogravimetry differential scanning calorimetry (TG-DSC). Catalysts were further characterized using N₂ adsorption, scanning electronic microscopy (SEM), X-ray diffraction (XRD), N₂O oxidation followed by H₂ titration, and temperature-programmed reduction with H₂ (H₂-TPR). The reduction processes were also monitored with in-situ XRD. The physicochemical properties of catalysts depended strongly on the types of precursor salts, and catalysts prepared using Al acetate and Cu nitrate as starting materials had a larger surface area, larger exposed metallic copper surface area, and lower reduction temperature. The CO hydrogenation performances of these catalysts were compared and discussed in terms of their structures. Catalysts prepared with copper nitrate, zinc and aluminum acetates exhibited the highest catalytic activity.     

Roda Boa, Roda Boa: Legitimate peripheral participation in diasporic capoeira

Capoeira, the Brazilian dance and martial art, is taught across the world. Learners acquire vital knowledge and are socialised as capoeiristas through legitimate peripheral participation, in particular when watching games in the roda. The roda, the circle within which the capoeira game is played, is a classic place for learning by legitimate peripheral participation to occur. Watching, listening, and feeling the energy of the roda are central to the acquisition of capoeira abilities and capabilities, especially the tacit, indeterminate knowledge and skills.     

A feminist posthumanist ecopedagogy in/for/with animalScapes

ABSTRACT

Extending and challenging Arun Appadurai's anthropocentric “scapes,” this article converses with feminist posthumanism, ecofeminism, and the political ecology of education to develop a more-than-human ecopedagogy in/for/with animalScapes. After outlining the article's theoretical framework, I briefly discuss the research cases informing ecopedagogies in/for/with animalScapes, each of which attends to embodiment, affect, and emotion, as well as the salience of political ecological/economic contexts. To conclude, I discuss the empirical and conceptual/theoretical limitations of this ecopedagogy, tentatively exploring how some of these limitations might be partially surpassed in practice, as well as in environmental education research tasking itself with decentering the human.     

Teaching criminal investigation/criminalistics with Fatal Vision/Fatal Justice

This article discusses how two publications can be utilized as a practical pedagogical tool when teaching courses covering criminal investigations and criminalistics. The first book, Fatal Vision, has proven to be a useful tool in complementing a criminal investigations textbook with a real-life scenario that students can analyze and draw upon to understand the importance of evidence collection at a crime scene. The second book, Fatal Justice, has proven to be the natural extension of the first book, which serves as a useful tool in explaining the connection between evidence collection and forensic science, providing a real-world, in-depth, and controversial exploration of criminalistics.     

Active changes of lignification-related enzymes in pepper response to Glomus intraradices and/or Phytophthora capsici

The activities of enzymes responsible for lignification in pepper, pre-inoculation with arbuscular mycorrhizal (AM) fungus ofGlomus intraradices and/or infection with pathogenic strain ofPhytophthora capsici, and the biological control effect ofG. intraradices on Phytophthora blight in pepper were investigated. The experiment was carried out with four treatments: (1) plants pre-inoculated withG. intraradices (Gi), (2) plants pre-inoculated withG. intraradices and then infected withP. capsici (Gi+Pc). (3) plants infected withP. capsici (Pc), and (4) plants without any of the two microorganisms (C). Mycorrhizal colonization rate was reduced by about 10% in pathogen challenged plants. Root mortality caused by infection ofP. capsici was completely eliminated by pre-inoculation with antagonisticG. intraradices. On the ninth day after pathogen infection, Peroxidase (POD) activity increased by 116.9% in Pc-treated roots but by only 21.2% in Gi+Pc-treated roots, compared with the control, respectively. Polyphenol oxidase (PPO) and Phenylalanine ammonia-lyase (PAL) activities gradually increased during the first 3 d and dramatically decreased in Pc-treated roots but slightly decreased in Gi+Pc-treated roots, respectively. On the ninth day after pathogen infection, PPO and PAL decreased by 62.8% and 73.9% in Pc-treated roots but by only 19.8% and 19.5% in Gi+Pc-treated roots, compared with the control, respectively. Three major POD isozymes (45000, 53000 and 114000) were present in Pc-treated roots, while two major bands (53000 and 114000) and one minor band (45000) were present in spectra of Gi+Pc-treated roots, the 45000 POD isozyme was significantly suppressed byG. intraradices, suggesting that the 45000 POD isozyme was induced by the pathogen infection but not induced by the antagonisticG. intraradices. A 60000 PPO isozyme was induced in Pc-treated roots but not induced in Gi+Pc-treated roots. All these results showed the inoculation of antagonisticG. intraradices alleviates root mortality, activates changes of lignification-related enzymes and induces some of the isozymes in pepper plants infected byP. capsici. The results suggested thatG. intraradices is a potentially effective protection agent againstP. capsici. Project supported by Korea Science and Engineering Foundation (KOSEF) through the Agricultural Plants Stress Research Center (APSRC) at Chonnam National University, Korea     

Beating the Odds: Exploring the 90/90/90 Phenomenon

This article presents a case study of one high performing high poverty campus serving students of color in South Central Texas. The researchers utilized the criteria for 90/90/90 schools established by Douglas Reeves (2004 Reeves, D. 2004. Accountability in action: A blueprint for learning organizations, Englewood, CA: Advanced Learning Press.  [Google Scholar]). In order to meet these criteria, schools had to have the following characteristics: 90% or more of the student body had to be non-Anglo, 90% or more of the students had to qualify for free or reduced lunch, and achievement testing was mastered at rates of 90% or greater. Researchers conducted an initial examination of every public school within a 16,631 square mile area utilizing these criteria. The results yielded 15 schools that met this standard at least once between the years 2006–2010. Only one school met the criteria in each of these years. Panel interviews, focus groups, site visits, and individual follow up interviews were conducted to glean information on the characteristics of this high performing campus, the results of which are presented herein.     

Point/counterpoint

Discussion focuses on those problems caused by the isolation of studies in logic from studies in education. The authors recommend a taxonomic distinction in formal inference‐making routines that has long been recognized in the field of logic. The authors illustrate how this taxonomic distinction can be usefully employed in the classroom to help children think more precisely and to think about thinking more deliberately.     

二氧化硅负载硅钨钼酸催化合成丁酮乙二醇缩酮

采用溶胶-凝胶法制备了二氧化硅负载硅钨钼酸催化剂.以其为催化剂,对以丁酮和乙二醇为原料合成丁酮乙二醇缩酮的反应条件进行了研究,较系统地研究了酮醇物质的量比、催化剂用量、带水剂环己烷,反应时间对收率的影响.实验表明,二氧化硅负载硅钨钼酸催化剂是合成丁酮乙二醇缩酮的良好催化剂,在n（丁酮）∶n（乙二醇）=1∶1.4,催化剂用量为原料总质量的0.6%,环己烷作带水剂10 mL,反应时间75min的优化条件下,丁酮乙二醇缩酮的收率可达96.77%.     

Beyond regimes of signs: making art/istic portrayals of haptic moments/movements with child/ren/hood

ABSTRACT

In this paper, we try to move beyond fixed narratives of child/ren and childhoods, a fixity that comes, in part, as a consequence of the adult/child dyad. We undertake a cutting together-apart of childhood photographs which allows us to explore the complex machinery that produces the categories of child/ren as human beings that are, variously, de(scribed) as not only ‘natural’, ‘innocent’ and ‘romantic’, but also ‘uncanny’ and ‘sexual’, tropes that find meaning and depiction through child/hood bodies and faces. Inspired by non-representational ethnography, we want to generate pictorial acts that move beyond the face – ‘as regimes of signs’ so that body and language can interrelate where ‘the configuration of the face is inextricably tied to the evolution of the voice’. In undertaking a form of schizoanalysis, we undo images of child/ren/hood from ‘the inside’ by connecting to haptic thinking as well as cutting together-apart, processes that allow us to think otherwise about our own and other childhood(s). Additionally, we want to liberate child/ren/hoods through artistic photograph sensing, and doings may be seen as a political act, a way to break down boundaries of power through art as events.     

mpg-C3N4/BiVO4异质结光催化剂的制备及其降解复方磺胺甲恶唑的效果研究

采用水热合成法制备了典型的手里剑型钒酸铋晶体（BiVO₄）,利用硬模板法制备了介孔氮化碳材料（mpg-C₃N₄）,运用超声分散的方法将二者复合,制得mpg-C₃N₄/BiVO₄异质结光催化剂。文章考察了其在可见光条件下降解复方磺胺甲恶唑的效果,并探讨了影响降解效果的因素。     

关于T凸函数的不等式

In this paper, the Tφ-convex functions were introduced as a generalizations of convex functions. Then the characteristics of the Tφ-convex functions were discussed. Furthermore, some new inequalities for the Tφ-convex functions were derived.     

《宝剑记》对《水浒传》的继承与创新

《宝剑记》主要取材于我国古典小说《水浒传》中"林冲落草"这段故事。相较来看,《宝剑记》继承了《水浒传》的很多方面,包括主要人物设置,故事情节内容,"忠奸"主题思想。除此,《宝剑记》在人物形象、情节脉络、中心矛盾、起因结局等方面又有所创新。《宝剑记》对《水浒传》的改编凸显出明中叶反封建专制统治的社会思潮和人的自我意识的觉醒,也是作者李开先个人心灵世界的直接映现,具有明显的进步性与现实意义。     

Mediation analysis of an adolescent HIV/STI/pregnancy prevention intervention

Most interventions designed to prevent HIV/STI/pregnancy risk behaviours in young people have multiple components based on psychosocial theories (e.g. social cognitive theory) dictating sets of mediating variables to influence to achieve desired changes in behaviours. Mediation analysis is a method for investigating the extent to which a variable X (e.g. intervention indicator) influences an outcome variable Y (e.g. unprotected sex) by first influencing an intermediate variable M (e.g. self-efficacy to use a condom) and provides a way for empirically validating theoretical hypothesised mediators. In this way, mediation analysis is a critical tool for suggesting which components of complex interventions should be the focus of more efficient and effective interventions in the future. The present study applied multilevel mediation analysis to outcome data from the All4You2! study to begin to examine the relationships between a theory-based HIV/STI/pregnancy prevention curriculum for students attending alternative high schools who were at risk of educational failure. The study targeted psychosocial mediating variables and the primary outcome unprotected sex in the past three months. Results suggest helping young people attending alternative schools identify and avoid exposure to risky situations and improving their self-efficacy to refuse sex should be focal points of future interventions.     

Molten Salt Synthesis of （K0.47Na0.47Li0.06） NbO3 Lead-Free Piezoelectric Ceramics

(K0.47Na0.47Li0.06)NbO3 (KNLN) lead-free ceramics were prepared by molten salt synthesis (MSS) method using k2CO3-Na2CO3 eutectic mixtures as the flux. The microstructure and piezoelectric properties when sintered at 980-1 030 ℃ were investigated. The calcined powders were examined by X-ray diffraction. The microstructure of the calcined powders and sintered bodies was observed using a scanning electron microscope (SEM).The piezoelectric constant d33 was measured using a quasi-static piezoelectric d33 meter. The planar coupling coefficient Kp was calculated by resonance-antiresonance method. The experimental data for each sample's performance indicators were the average values of 8 specimens. The relative densities of sintered specimens are above 97%, and the dielectric loss is below 0.03. It was found that (K0.47Na0.47Li0.06)NbO3 prepared by MSS is compact and lead-free. The piezoelectric constant d33 is 216 pC·N-1 and the planar electromechanical coupling factor Kp is 0.352.     

Using chimeric piggyBac transposase to achieve directed interplasmid transposition in silkworm Bombyx mori and fruit fly Drosophila cells

The piggyBac transposon has been long used to integrate foreign DNA into insect genomes. However, undesirable transgene expression can result from random insertions into the genome. In this study, the efficiency of chimeric Gal4-piggyBac transposase in directing integration onto a DNA target plasmid was evaluated in cultured silkworm Bombyx mori Bm-12 and fruit fly Drosophila Schneider 2 (S2) cells. The Gal4-piggyBac transposase has a Gal4 DNA-binding domain (DBD), and the target plasmid has upstream activating sequences (UAS) to which the Gal4 DBD can bind with high affinity. The results indicate that, in the Bm-12 and S2 cells, transpositional activity of Gal4-piggyBac transposase was increased by 4.0 and 7.5 times, respectively, compared to controls, where Gal4-UAS interaction was absent. Moreover, the Gal4-piggyBac transposase had the ability of directing piggyBac element integration to certain sites of the target plasmid, although the target-directing specificity was not as high as expected. The chimeric piggyBac transposase has the potential for use in site-directed transgenesis and gene function research in B. mori.     

Becoming Teacher: A/r/tographical Inquiry and Visualising Metaphor

A great deal has been written about the representational use of metaphor to understand teacher candidates’/new teachers’ conceptions of teacher practice. This article will discuss recent research that explored secondary visual art teacher candidates’/new teachers’ visualising of visual metaphors to provoke their a/r/tographical inquiry into their perceptions of practice. This article engages with the Deleuzian conception becoming as well as the ontology of difference to provoke the reimagination of metaphor in research. We offer new understandings about visualising the visual in research and the methodological implications of relational research practices.