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顶管机在顶进过程中受到管节与土之间的摩擦力,泥浆性质直接影响管节表面的摩擦力.本文通过调整泥浆液中膨润土及增稠剂的掺量,采用流变仪分析计算了宾汉方程与幂律方程的4个参数及漏斗粘度.结果 表明:当膨润土的掺量在8%~12%时,泥浆的流变性能较为适合;膨润土和CMC含量增加,泥浆变浓稠内摩擦增大,易形成网状结构,因此动切力增大,尤其当膨润土和CMC掺量在较高水平时,这一现象更为显著;流性指数随膨润土含量增高而降低;稠度系数会随膨润土含量提升而增大;膨润土及CMC掺量增加会使漏斗粘度上升. 相似文献
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Tsveti Markova Lisa Dillon Pierre Morris Khalid Zakaria Giancarlo Zuliani 《Performance Improvement》2014,53(10):13-21
Although there are challenges in delivering a quality improvement initiative at academic medical centers, the potential benefits to resident physicians‐in‐training, hospitals, and patients are significant. This article describes the effects of an institution‐wide effort. Resident physicians‐in‐training from four medical specialty programs partnered with hospital staff while working on team quality‐improvement projects. We tracked clinical outcomes and used validated assessments. The results showed improvements in learning and organizational culture. 相似文献
74.
The article presents an analysis of how diversity is defined and attended to in Swedish schools. The research reported has been carried out as a case study of categorizing practices that concern the uses of neuropsychiatric diagnoses, notably ADHD. The data were collected as part of a larger study. The interaction over a two-year period between the parents of a boy (William, aged 5.5 years) and representatives of the school (school psychologist, principal, teacher etc.) has been analysed. It is shown that parents and professionals provide different accounts of William’s difficulties. The parents, while not denying that their son causes problems in class, argue that the boy will mature and that the problems will disappear. The representatives of the school try to convince the parents that a neuropsychiatric examination of the boy will be beneficial to all parties. The long process of negotiation can be understood as a rhetorical drama, where the category ‘ADHD’ serves as the resolution of a complex institutional problem in the modern welfare state. 相似文献
75.
Tanja Link Eva Johanna Schwarz Stefan Huber Dr. Ursula Fischer Prof. Dr. Hans-Christoph Nuerk Prof. Dr. Ulrike Cress Prof. Dr. Korbinian Moeller 《Zeitschrift für Erziehungswissenschaft》2014,17(2):257-277
Basic numerical representations are seen as the building block for the successful development of more complex numerical and arithmetic competencies. Extending previous studies focusing on improving basic numerical representations by means of embodied training schemes, the current study focused on an embodied training of children’s place-value understanding. In this vein, 49 secondgraders were trained on solving a number line estimation task by stepping on different fields of a dance mat allowing for separate estimations of tens and units with more effort needed to step on the tens. In a partially randomized cross-over design, two control conditions were used to controll for training effects caused exclusively by the numerical content trained or the use of the dance mat. Interestingly, results revealed specific training effects after both the embodied and the control conditions. However, training effects were significantly more pronounced after the embodied training, thereby providing further evidence for the benefit of an embodied training of the place-value structure of the Arabic number system. 相似文献
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随着经济社会发展和高等教育已进入大众化的实际,贵州地方本科高校人才培养与黔中经济区对高层次技能型人才需求之间产生了较大错位,已成为制约区域经济发展的重要因素。地方本科高校强化职业技术教育是高等教育服务经济社会发展的客观趋势。地方本科高校应通过创新人才培养模式、加强"三师型"专业教师队伍建设、促进产学研合作等方式强化职业技术教育,构建本科高校与地方经济社会协调发展的良性互动机制。 相似文献
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To date, a limited number of aqueous conditions have been tested experimentally as potential cleaning reagents on modern acrylic paint films. Those assessed have tended to extract measurable quantities of paint film components and distort the paint films physically. In this paper the results of a series of experiments designed to examine pH, conductivity, and specific ion effects of potential aqueous cleaning solutions on a series of commercial acrylic paints are reported. A three-dimensional microscopic technique was used to characterize the physical (volume and surface roughness) changes and liquid chromatography-tandem mass spectrometry was used to characterize the chemical (extracted surfactant) changes following paint film exposure to the aqueous solution. The tested paint films in this study clearly exhibit an isotonic point below which swelling and extraction is significant, and above which the swelling and extraction is diminished. Manipulation of conductivity and the ionic species in solution can reduce both the physical film changes and surfactant extraction from acrylic paint films; while pH appears to be of limited use in controlling aqueous cleaning effects. Moreover, there seems to be a specific ion effect for both swelling and de-swelling in acrylic paint films that can be rationalized through the Hofmeister Series. 相似文献
80.
在教育信息化的滚滚浪潮中,金华市的各级各类学校纷纷投入巨资购置了各种现代教育设施。花巨资购置的这些设备的利用情况如何?为学校教育产生了多少效益?给学校教育带来了什么变革?给学生的学习行为产生了那些改变?笔者通过实地考察、问卷调查、座谈等多种形式,获取了第一手资料,从中发现了许多问题,并提出切实可行的解决对策。 相似文献