Highly Dispersed Pd Nanoparticles Supported on Zr-Doped MgAl Mixed Metal Oxides for 2-Ethylanthraquinone Hydrogenation

In this study,Pd-Mg(Al)-LDH/γ-Al_2O_3 and Pd-Mg(Al)Zr-LDH/γ-Al_2O_3 precursors were synthesized by impregnating Na_2PdCl_4 on Mg(Al)-LDH/γ-Al_2O_3 and Mg(Al)Zr-LDH/γ-Al_2O_3,and then the precursors were calcinated and reduced to obtain Pd-Mg(Al)-MMO/γ-Al_2O_3 and Pd-Mg(Al)Zr-MMO/γ-Al_2O_3 catalysts.Compared with Pd/γ-Al_2O_3 catalyst,the hydrogenation efficiency of Pd-Mg(Al)-MMO/γ-Al_2O_3 and Pd-Mg(Al)Zr-MMO/γ-Al_2O_3 increased by 15.7%and 24.0%,respectively.Moreover,the stability of Pd-Mg(Al)Zr-MMO/γ-Al_2O_3 catalyst was also higher than that of Pd/γ-Al_2O_3.After four runs,the hydrogenation efficiency of Pd/γ-Al_2O_3 decreased from 12.1 to 10.0 g/L,while that of Pd-Mg(Al)Zr-MMO/γ-Al_2O_3 decreased from 15.0 to 14.3 g/L.The active aquinones selectivities of all catalysts were almost 99%.The structures of the catalysts were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM),N_2 adsorption-desorption,inductively coupled plasma-atomic emission spectrometry (ICP-AES),CO chemisorption analysis,transmission electron microscopy (TEM),temperature-programmed reduction with hydrogen (H_2-TPR),and X-ray photoelectron spectroscopy(XPS).The results indicate that the improved catalytic performance is attributed to the stronger interaction between Pd and Mg(Al)Zr-MMO/γ-Al_2O_3,smaller Pd particle size and higher Pd dispersion.This work develops an effective method to synthesize highly dispersed Pd nanoparticles based on the layered double hydroxides (LDHs) precursor.     

Tenets of Body-Soul Rooted Pedagogy: teaching for critical consciousness,nourished resistance,and healing

ABSTRACT

For marginalized communities, schooling is mired in social/bodily control, tracking, and cultural erasure circumscribing difference/culture as obstacles, as opposed to sites of wisdom, connectedness, and critical consciousness. Authors shape a transformative pedagogical framework across teacher education and partnering schools by utilizing spiritually embodied, land-based Chicana Feminist and Indigenous Epistemologies. We outline six tenets of Body-Soul Rooted Pedagogy which: 1) construct education politically, 2) enact schooling as decolonization/empowerment, 3) center epistemologies, multiliteracies of marginalized groups, 4) foster critical frameworks navigating oppression, 5) engage social action pedagogy, and 6) engender hope, well-being. Scholarship has implications for educational theory and practice at all levels.     

高校体育课程资源的若干理论问题探讨

运用文献资料法、逻辑分析法,对国内关于体育课程资源的研究进行回顾,对体育课程资源的概念、分类方法、筛选机制、开发的途径与方法进行比较分析,并且这一基础上探讨适合高校体育课程资源建设的理论问题,为高校体育课程资源的开发与利用提供理论参考。     

Strategies and effectiveness of teaching universal design in a cross-faculty setting

Universal design of built environments is an area of professional interest for both architects and occupational therapists, yet is not always specifically included in undergraduate curricula. This paper reports on the student experience of introducing universal design education into architecture and occupational therapy curricula. Online and face-to-face teaching methods were employed, including virtual and real-life simulation activities designed to provide students with a personal experience of impairment. Virtual simulation activities used the medium of Second Life?. Results showed improvement in self-reported learning outcomes related to universal design and, overall, students found the learning activities and resources useful. Real-life simulations were reported to be more useful than virtual simulations. Project outcomes support the introduction of universal design education into architecture and occupational therapy curricula, and offer insight into student perceptions and future directions for related teaching and learning resources.     

袭人和晴雯形象新解

《红楼梦》男主人公贾宝玉的两个既俊俏又聪慧的大丫环——袭人和晴雯,作者并无贬一个褒一个、薄一个厚一个,而是把她俩作为同是受驱使、受奴役的正面人物来描绘的,真实地活画了身处贾府特殊环境和具有特殊地位的两个丫环的典型形象。正确认识、分析这两个人物,对于深入研究《红楼梦》的艺术形象创造应当是有益的。     

Issues and challenges of teaching and learning in 3D virtual worlds: real life case studies

We aimed to study the characteristics and usage patterns of 3D virtual worlds in the context of teaching and learning. To achieve this, we organised a full‐day workshop to explore, discuss and investigate the educational use of 3D virtual worlds. Thirty participants took part in the workshop. All conversations were recorded and transcribed for analysis. Thematic analysis was carried out to identify prominent issues and topics. We found that to fully utilise 3D virtual worlds for teaching and learning, students, tutors and educational institutions face a number of socio‐psychological, pedagogical and technological challenges. The paper highlights and discusses the issues that emerged from the workshop, supporting them with real life experiences and case studies provided by the workshop participants.

Probleme und Herausforderungen des Unterrichtens und Lernens in virtuellen 3D Welten: “echte” Lebensfallstudien

Wir hatten zum Ziel, die Eigenschaften und die Gebrauchsweise von 3D‐virtuellen Welten im Zusammenhang mit Unterricht und Lernen zu studieren. Dazu organisierten wir einen ganztägigen Workshop, um den Gebrauch von 3D virtuellen Welten im Bildungsbereich zu erforschen, zu besprechen und zu untersuchen. Dreißig Teilnehmer nahmen an diesem Workshop teil. Alle Gespräche wurden aufgezeichnet und für die Analyse transskribiert. Eine thematische Analyse wurde ausgeführt, um gängige Probleme und Themen herauszufinden. Wir meinen, dass, um virtuelle 3D‐Welten komplett zu verwerten, um darin zu unterrichten und Erfahrungen zu sammeln, Studenten, Tutoren und Bildungseinrichtungen mehreren sozialpsychologischen, pädagogischen und technologischen Herausforderungen gegenüberstehen. Dieser Beitrag beleuchtet und bespricht die Probleme, die innerhalb des Workshops auftauchten und unterstützt ihr Verständnis durch von den Workshopteilnehmern selbst zur Verfügung gestellten Lebenserfahrungen und Fallstudien.

Problèmes et défis de l’enseignement/apprentissage dans des mondes virtuels en 3D: des études de cas empruntés à la vie réelle

Nous avions pour but d’étudier les caractéristiques et les schémas d’usage des mondes virtuels en 3D dans un contexte d’enseignement et apprentissage. Pour y parvenir, nous avons organisé un atelier d’une journée entière pour débattre, explorer et mener une recherche sur l’emploi éducatif des mondes virtuels en 3D. L’atelier a accueilli 30 participants. Toutes les conversations ont été enregistrées et transcrites à des fins d’analyse. On a effectué une analyse thématique pour identifier les problèmes et les thèmes les plus marquants. Nous avons découvert que pour utiliser à fond les mondes virtuels en 3D pour l’enseignement et l’apprentissage, les étudiants, les tuteurs et les institutions éducatives doivent faire face à un certain nombre de défis socio‐psychologiques, pédagogiques et technologiques. Dans cet article l’accent et le débat portent sur les questions qui sont apparues au cours de l’atelier, le tout appuyé sur des expériences de la vie réelle et sur des études de cas fournies par les participants à l’atelier.

Problemas y desafíos de la enseñanza/aprendizaje en mundos virtuales 3D: estudios de casos de la vida real

Nuestro propósito era el estudio de las características y de los esquemas de uso de los mundos virtuales 3D dentro del contexto de la enseñanza/aprendizaje. Para llevar esto a cabo hemos organizado un taller de un día completo para explorar, discutir y investigar el uso educativo de los mundos virtuales 3D. Treinta personas participaron en el taller. Todas las conversaciones fueron grabadas y transcribidas para ser analizadas. Un análisis temático fué realizado para identificar los temas y problemas más destacados. Hemos descubierto que para aprovechar plenamente los mundos virtuales 3D para la enseñanza/aprendizaje, los alumnos, los tutores y las instituciones educativas tienen que hacer frente a un número de desafíos socio‐psicológicos, pedagógicos y tecnológicos. En el artículo los autores destacan y discuten los problemas que han surgido del taller, apoyandoles con experiencias de la vida real y estudios de casos suministrados por los participantes del taller.     

Motivational cost aspects of physical education in middle school students

Expectancy value theory presumes that learners’ motivation is determined by their expectancy beliefs and task values associated with learning tasks. This study examined students’ cost and its relation to expectancy beliefs, other task value components in physical education. Middle school students (N?=?593) from 11 schools completed the expectancy-value questionnaire. Qualitative analysis of students’ responses to open-ended questions showed motivational cost originated from curriculum content, instructional conditions/elements, physical discomfort, lack of social support and competence and teacher factors. Chi-square analysis suggests that students’ motivational cost is associated with their hypothetical choices of attending physical education. Motivational cost was found to be negatively associated with other task value components, but not with expectancy beliefs.     

从古文的文体特点看其英译

文章阐述了中国古代散文在词汇、句法篇章上的一些文体特征 ;论及如何从古文的文体特征出发 ,运用增译、省译、篇章翻译等综合手段 ,将古文翻译成地道的英语。     

吉林省高技能人才结构问题探析

高技能人才是我国人才队伍的重要组成部分,高技能人才问题已成为阻碍吉林省经济发展的主要因素之一,其中,最主要的是人才结构不合理。文中拟对我省高技能人才结构问题的现状进行分析,找出存在的问题,并提出解决我省高技能人才结构问题的对策。     

杨柳煤矿瓦斯防治分析

瓦斯事故是煤矿开采过程中发生的严重自然灾害之一,在特大煤矿事故中占很大比例,所以搞好瓦斯防治是至关重要;简要介绍了本矿地质构造情况,分析了瓦斯分布以及影响瓦斯含量的各种影响因素,本矿安全生产面临着严峻形势,为了能够降低瓦斯含量,消除隐患,实现安全生产;重点介绍了煤矿瓦斯防治的技术手段,其包括顺层钻孔抽放,斜交钻孔,高位走向钻孔,向上拦截钻孔以及埋管抽放技术在本矿中的具体应用。