排序方式： 共有74条查询结果，搜索用时 15 毫秒
61.
防止石墨电极高温氧化的实验研究 总被引：2，自引：0，他引：2
通过对石墨电极高温防氧化失重实验,对石墨电极高温防氧化机理进行了初步研究。采取向电极表面直接喷淋防氧化溶液的方法,迅速降低石墨电极表面温度,并在电极表面生成连续、均匀的防氧化膜,显著提高石墨电极高温抗氧化能力,达到降低石墨电极消耗的目的。 相似文献
62.
Marina Lívia Venturini Ferreira Amanda Veiga Sardeli Giovana Vergínia De Souza Valéria Bonganha Lucas Do Carmo Santos Alex Castro 《Journal of sports sciences》2017,35(24):2412-2420
This study investigated the autonomic and haemodynamic responses to different aerobic exercise loads, with and without blood flow restriction (BFR). In a crossover study, 21 older adults (8 males and 13 females) completed different aerobic exercise sessions: low load without BFR (LL) (40% VO2max), low load with BFR (LL-BFR) (40% VO2max + 50% BFR) and high load without BFR (HL) (70% VO2max). Heart rate variability and haemodynamic responses were recorded during rest and throughout 30 min of recovery. HL reduced R–R interval, the root mean square of successive difference of R–R intervals and high frequency during 30 min of recovery at a greater magnitude compared with LL and LL-BFR. Sympathetic–vagal balance increased the values for HL during 30 min of recovery at a greater magnitude when compared with LL and LL-BFR. Post-exercise haemodynamic showed reduced values of double product at 30 min of recovery compared to rest in LL-BFR, while HL showed higher values compared to rest, LL-BFR and LL. Reduced systolic blood pressure was observed for LL-BFR (30 min) compared to rest. Autonomic and haemodynamic responses indicate lower cardiovascular stress after LL-BFR compared to HL, being this method, besides the functional adaptations, a potential choice to attenuate the cardiovascular stress after exercise in older adults. 相似文献
63.
Neeltje E. Blankenstein Eva H. Telzer Kathy T. Do Anna C.K. van Duijvenvoorde Eveline A. Crone 《Child development》2020,91(3):e665-e681
This study tested the pathways supporting adolescent development of prosocial and rebellious behavior. Self-report and structural brain development data were obtained in a three-wave, longitudinal neuroimaging study (8–29 years, N = 210 at Wave 3). First, prosocial and rebellious behavior assessed at Wave 3 were positively correlated. Perspective taking and intention to comfort uniquely predicted prosocial behavior, whereas fun seeking (current levels and longitudinal changes) predicted both prosocial and rebellious behaviors. These changes were accompanied by developmental declines in nucleus accumbens and medial prefrontal cortex (MPFC) volumes, but only faster decline of MPFC (faster maturity) related to less rebellious behavior. These findings point toward a possible differential susceptibility marker, fun seeking, as a predictor of both prosocial and rebellious developmental outcomes. 相似文献
64.
采用自制的大分子表面改性剂对纳米AlN进行表面改性,对改性前后的纳米AlN进行粒径分析、FTIR、XPS、TGA等表征.结果表明,大分子改性剂和纳米AlN的表面发生化学键合,有效地阻止了纳米AlN的团聚,使纳米AlN颗粒达到纳米级分散. 相似文献
65.
M. Naci Kayaoğlu Şakire Erbay Cristina Flitner Doğan Saltaş 《Journal of Further & Higher Education》2016,40(5):682-705
Plagiarism continues to dominate the academic world as one of its greatest challenges, and the existing literature suggests cross-cultural investigation of this critical issue may help all shareholders who detect, are confronted by and struggle with this issue to address it. Therefore, the present study, drawing upon a cross-cultural investigation using a questionnaire, aimed to investigate the differences between three groups of students, namely, Turkish (n = 106), Georgian (n = 83) and German (n = 72) regarding their tendency to conduct academic theft. It also investigated ways in which to plagiarise and reasons for and awareness of this issue. The results show that lack of time, busy schedules and weak academic writing skills are the most frequent reasons for plagiarism. However, in contrast to previous studies, the role of the Internet was found to be minimal in relation to increasing plagiarism. It is also worth noting that the German participants were found to have a higher level of sensitivity to this academic malpractice and were seen to be much more successful at identifying it. The article concludes with workable suggestions on how to discourage academic theft at universities. 相似文献
66.
Mary P. Sheridan Amélie Lemieux Ashley Do Nascimento Hans Christian Arnseth 《British journal of educational technology : journal of the Council for Educational Technology》2020,51(4):1277-1291
This paper examines what new materialist and posthumanist frameworks can offer learning science research in diverse maker learning environments. We explore what is gained by grappling with the entanglements between humans, non-humans and more-than-humans. To do this, we draw on Karen Barad's ethico-onto-epistemology and agential realism where she redefines connections to the shared world by attuning to the entangled matter that is created within intra-actions. We use this framework across four international cases: digital media camps, a university-level classroom-based makerspace, a Saturday outdoor makerspace workshop and a classroom-based museum makerspace. Each case study attends to how intra-actions enact agential forces in maker education research—forces that posthuman and new materialist frameworks help us see. In so doing, these case studies challenge many of the assumptions prevalent in the learning sciences about mattering and its implications in research sites. 相似文献
67.
吴国玺 《西北成人教育学报》2009,81(3):60-61
语文经典是民族文化传承的基本依托,经典阅读教学是语文教学的重要内容,因为学生可在与中外文学大师的对话中,接受精神的洗礼和心灵的启迪。然而,当前的阅读教学却存在着许多误区,应当对此予以纠正,使得经典真正成为纯化学生灵魂、感知中国文化魅力的重要工具。 相似文献
68.
分析虚拟化存储技术,提出构建一个全冗余、无单点故障、易于管理的网络存储架构,从而提高图书馆网络存储和服务器应用的高可用性,避免数据存储在IT架构中的无序增长,消除信息孤岛,优化信息生命周期管理。 相似文献
69.
Napapan Meepadung John C.S. Tang Do Ba Khang 《The Journal of High Technology Management Research》2009,20(2):145-152
Data envelopment analysis (DEA) is an ideal tool to assess a bank branch's operating and profit efficiency. This study went a step further to also explore the impact of IT-based retail banking services on branch efficiency, and found that IT-based transactions at the branch level have a significant impact on profit efficiency, and therefore have a significant role to play in profit maximization. Improving bank branch technology to best support service delivery is also a practical way to achieve greater efficiency, which in turn, contributes to a commercial bank's overall profitability. 相似文献
70.
从心理契约视角看知识型图书馆人力资源管理 总被引：1，自引：0，他引：1
本文通过心理契约概念的引入,从心理契约和人力资源的关系,分析了知识型图书馆员工的心理契约现状,并提出了心理契约在知识型图书馆人力资源管理中的应用措施. 相似文献