Selective electrochemical production of hydrogen peroxide at zigzag edges of exfoliated molybdenum telluride nanoflakes     

Xuan Zhao  Yu Wang  Yunli Da  Xinxia Wang  Tingting Wang  Mingquan Xu  Xiaoyun He  Wu Zhou  Yafei Li  Jonathan N Coleman  Yanguang Li 《国家科学评论(英文版)》2020,7(8):1360

The two-electron reduction of molecular oxygen represents an effective strategy to enable the green, mild and on-demand synthesis of hydrogen peroxide. Its practical viability, however, hinges on the development of advanced electrocatalysts, preferably composed of non-precious elements, to selectively expedite this reaction, particularly in acidic medium. Our study here introduces 2H-MoTe₂ for the first time as the efficient non-precious-metal-based electrocatalyst for the electrochemical production of hydrogen peroxide in acids. We show that exfoliated 2H-MoTe₂ nanoflakes have high activity (onset overpotential ∼140 mV and large mass activity of 27 A g⁻¹ at 0.4 V versus reversible hydrogen electrode), great selectivity (H₂O₂ percentage up to 93%) and decent stability in 0.5 M H₂SO₄. Theoretical simulations evidence that the high activity and selectivity of 2H-MoTe₂ arise from the proper binding energies of HOO^* and O^* at its zigzag edges that jointly favor the two-electron reduction instead of the four-electron reduction of molecular oxygen.  相似文献   

Effects of a Research-Infused Botanical Curriculum on Undergraduates’ Content Knowledge,STEM Competencies,and Attitudes toward Plant Sciences     

Jennifer Rhode Ward  H. David Clarke  Jonathan L. Horton 《CBE life sciences education》2014,13(3):387-396

In response to the American Association for the Advancement of Science''s Vision and Change in Undergraduate Biology Education initiative, we infused authentic, plant-based research into majors’ courses at a public liberal arts university. Faculty members designed a financially sustainable pedagogical approach, utilizing vertically integrated curricular modules based on undergraduate researchers’ field and laboratory projects. Our goals were to 1) teach botanical concepts, from cells to ecosystems; 2) strengthen competencies in statistical analysis and scientific writing; 3) pique plant science interest; and 4) allow all undergraduates to contribute to genuine research. Our series of inquiry-centered exercises mitigated potential faculty barriers to adopting research-rich curricula, facilitating teaching/research balance by gathering publishable scholarly data during laboratory class periods. Student competencies were assessed with pre- and postcourse quizzes and rubric-graded papers, and attitudes were evaluated with pre- and postcourse surveys. Our revised curriculum increased students’ knowledge and awareness of plant science topics, improved scientific writing, enhanced statistical knowledge, and boosted interest in conducting research. More than 300 classroom students have participated in our program, and data generated from these modules’ assessment allowed faculty and students to present 28 contributed talks or posters and publish three papers in 4 yr. Future steps include analyzing the effects of repeated module exposure on student learning and creating a regional consortium to increase our project''s pedagogical impact.  相似文献   

Stockley's Drug Interactions. Tenth edition,Stockley's Drug Interactions Pocket Companion 2013     

Carrie Driggers Adams 《Journal of the Medical Library Association》2014,102(3):221-222

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Psychomotor learning theory informing the design and evaluation of an interactive augmented reality hand hygiene training app for healthcare workers     

Lacey  Gerard  Gozdzielewska  Lucyna  McAloney-Kocaman  Kareena  Ruttle  Jonathan  Cronin  Sean  Price  Lesley 《Education and Information Technologies》2022,27(3):3813-3832

Education and Information Technologies - Hand hygiene is critical for infection control, but studies report poor transfer from training to practice. Hand hygiene training in hospitals typically...  相似文献   

NAECTE MEMBERS SPEAK UP     

Leah Adams 《Journal of Early Childhood Teacher Education》2013,34(3):309-311

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The relationships between exercise intensity, heart rate, and blood pressure during an incremental isometric exercise test   总被引：1，自引：0，他引：1  

Wiles JD  Allum SR  Coleman DA  Swaine IL 《Journal of sports sciences》2008,26(2):155-162

Currently, it is not possible to prescribe isometric exercise at an intensity that corresponds to given heart rates or systolic blood pressures. This might be useful in optimizing the effects of isometric exercise training. Therefore, the aim of this study was to explore the relationships between isometric exercise intensity and both heart rate and systolic blood pressure during repeated incremental isometric exercise tests. Fifteen participants performed seated isometric double-leg knee extension, during which maximum voluntary contraction (MVC) was assessed, using an isokinetic dynamometer. From this, a corresponding peak electromyographic activity (EMG(peak)) was determined. Subsequently, participants performed two incremental isometric exercise tests (at least 48 h apart) at 10, 15, 20, 25, and 30% EMG(peak), during which steady-state heart rate and systolic blood pressure were recorded. In all participants, there were linear relationships between %EMG(peak) and heart rate (r at least 0.91; P < 0.05) and between %EMG(peak) and systolic blood pressure (r at least 0.92; P < 0.05). Also, when repeated tests were compared, there were no differences in the slopes (P > 0.50) or elevations (P > 0.10) for either of the relationships. Therefore, these linear relationships could be used to identify isometric exercise training intensities that correspond to precise heart rates or systolic blood pressures. Training performed in this way might provide greater insight into the underlying mechanisms for the cardiovascular adaptations that are known to occur as a result.  相似文献   

Values: Roots or Fruits? Shifting the Emphasis in Values Education     

Jonathan Long 《Pastoral Care in Education》1997,15(3):30-35

Jonathan Long suggests that current interpretations of values education are dominated by a number of ideas that appear to make attempts to achieve clarity and consensus extremely difficult. He argues that 'essential to the successful development and promotion of values in a secular state educational system is a shifting of emphasis which enables us to see the context as an opportunity rather than a problem'. He goes on to suggest that schools should focus on what he describes as the 'roots' of values. In his view, these roots involve the questions 'What is it to be human?' and 'What counts as human flourishing?'. Thus, schools must engage with issues of identity and direction.  相似文献   

The effects of speech and language therapy intervention on children with pragmatic language impairments in mainstream school     

Catherine Adams  Julian Lloyd 《British Journal of Special Education》2007,34(4):226-233

In this article, Catherine Adams, clinical senior lecturer in speech and language therapy at the University of Manchester, and Julian Lloyd, senior lecturer in psychology at Newman College, Birmingham, describe the implementation and effects of an intensive programme of speech and language therapy for children who have pragmatic language impairment (PLI) attending mainstream education in the north west of England. An intervention which focused on aspects of pragmatic language such as conversation, inference and narrative was developed. Six children who have PLI (mean age=7;10 years), all with a Statement of special educational needs, participated in a single case study series in which they each received 20 sessions of the speech and language therapy programme in their own school. Guidance and specific training was provided for learning support assistants and classroom teachers. Despite showing heterogeneity in their initial profiles of impairment, progress in conversation skills was seen in all six children and some significant changes in language test performance were found. These findings suggest that intensive speech and language therapy intervention has the potential to produce generalis-able gains in language and communication skills in children who have PLI and indicate appropriate outcome measures for future effectiveness studies.  相似文献   

New Guidance Documents in Child Protection:New Messages for Schools     

Steve Adams 《Pastoral Care in Education》2002,20(2):3-6

Since 1999, government guidance in child protection has been issued which embodies a shift in practice and philosophy, sometimes expressed in the word 'refocusing'. School staff have never found child protection easy, but these shifts in policy and practice put particular demands on them. Steve Adams identifies these demands and the ways in which they differ from previous child protection expectations on schools. He sees real problems for schools in the new guidance, but also suggests ways in which they may work positively with at least some of the changes.  相似文献   

The Promotion of New Technology Through Fun and Spectacle: Electricity at the World's Columbian Exposition     

Judith A. Adams 《Journal of American culture (Malden, Mass. : 2003)》1995,18(2):45-55

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