一、Behavior of pre-stress group anchors——Theory approach and model（论文文献综述）
ERRAITEB MERYEM[1]（2021）在《摩洛哥货币政策实现通货膨胀应对的有效性研究》文中指出本文评价了摩洛哥在经济上采取的应对通货膨胀的货币政策,这是一个评估制度、技术和经济先决条件以及货币政策传导机制有效性的问题。文章梳理了摩洛哥的经济金融发展及其货币政策的演变,分析了通胀目标制货币政策在摩洛哥的适用性。为了解决这个问题,我们做出了一个基本假设,即摩洛哥不准备在短期内采取这种有效的战略。开展的研究包括首先评估此类货币政策所需的制度、经济和技术框架,然后再研究货币政策的传导机制。最后一点取决于VAR（矢量自回归）模型,以测试货币政策冲击后可能的反应。因此,我们的目标是验证在摩洛哥成功采用此类战略的必要条件是否确实得到满足。我们为这项研究设定了以下四个目标:一是将通胀目标制的框架理念定位为货币政策的创新实践。其次重点分析摩洛哥货币政策实践的演变。第三,我们总结了在摩洛哥实施通胀目标制战略的所有先决条件。第四,我们的目标是评估摩洛哥货币政策传导渠道的有效性。经济文献普遍认为,货币政策对价格具有短期影响和长期影响。这些影响是通过传导机制发挥的,传导机制可以定义为货币决策传递到收入和通货膨胀的过程。了解这些机制对于有效实施货币政策至关重要。实证文献中经常研究的因素,即利率、银行信贷、消费者价格和汇率。鉴于它们对经济和金融结构的密切依赖,这些渠道因国家而异。与发达国家不同,发展中国家和新兴国家受制于世界主要中央银行的货币政策,特别是欧洲中央银行和美国联邦储备银行的货币政策。这些国家的货币政策模型应该与发达国家有所不同。因此,忽视这样的特征可能会使估计结果产生偏差并引起经验悖论。货币政策的实施受到私营部门信贷水平和各国利率的制约。在这项工作结束时获得的结果使我们能够注意到中央银行在法律和实际方面的独立性方面的改进。在摩洛哥货币当局的信息和技术系统方面,我们取得了显着进步,从而为经济主体提供了有关货币政策领域决策的充分数据。然而,在宏观经济层面,结果显示出一些局限性。这些是摩洛哥金融体系深度的弱点,包括银行和金融两个组成部分,以及阻碍向灵活汇率制度过渡的不足之处。除上述之外,对货币政策传导机制的实证评估凸显了货币政策冲击后所采用的不同变量之间动态相互作用关系的局限性。摩洛哥经济及其金融体系的持续现代化、该国对外开放的方向以及其中央银行（马格里布银行,BAM）做法的演变证明了深化对货币政策传导。这些调查探索了将货币政策传播到摩洛哥经济的货币、金融和实体部门的渠道。正是在这个框架内,本论文采用了实证方法,涵盖了从1990年到2013年的重大结构性经济改革时期。因此,应用计量经济学方法“VAR”来研究经济反应的变化对经济变量的不同冲击。为了实现这项工作的目标,我们通过不同的实证步骤,旨在探索货币政策行动到其目标变量的路径,研究传导渠道的结构,以及评估央行无法控制的因素的影响。关于货币政策的传导。我们的估计表明,货币政策从BAM到摩洛哥经济的传导是不完整的,即使它发生在合理的时间范围内。此外,传输通道的不稳定结构部分解释了该过程中涉及的变量的态度。我们的结果还表明,财政和外部因素通过其目标变量行为的影响,明显扰乱了货币政策行动的传播阶段。简而言之,本文的主要贡献在于表明通货膨胀目标是摩洛哥货币当局抓住的机会,但在巩固收益的同时必须事先纠正这项工作中指出的不完善之处。
Kaleem Ullah Jan Khan[2]（2021）在《降雨入渗触发非饱和煤矸石堆积边坡失稳的机理研究》文中认为土坡的稳定性与降雨渗透过程有关,其特点是剪切强度降低以及吸力损失,从而最终导致了失稳。土坡失稳主要发生在降雨期间或降雨后,虽然已经被证明为降雨渗透导致土体强度降低以及孔隙水压力迅速增加而造成,但引发斜坡失稳的重要影响机理还没有得到充分的讨论。降雨强度和降雨持续时间对边坡稳定性的影响,但降雨渗透过程对煤矸石堆积边坡稳定性的影响尚需深入研究。为此研究降雨入渗过程对土坡稳定性的影响,尤其对世界范围内广泛分布的矿渣堆积体稳定性及环境安全具有重要意义。降雨特征（降雨强度和持续时间）和土体的导水性影响着边坡的稳定状态及失效类型。一般来说,土坡破坏的机理有两种,即降雨湿润锋的传播导致垫层吸力的丧失以及地下水位的上升。到目前为止,仍然没有明确的指标来确定导致矿渣型边坡失效的主导参数。因此,本研究在开展东北阜新地区一煤矸石堆积边坡失稳机制研究中考虑了降雨渗透过程。通过收集已有资料、现场调查、实验室试验和数值模拟方法,较深入研究了煤矸石堆积边坡降雨诱发的失稳过程及其机理。采用渗流-应力耦合和非耦合有限元分析方法,对煤矸石堆积边坡的失效机理进行评价。采用物理模型测试分析了不同降雨条件下土坡中孔隙水压力的分布特征,采用有限元法数值方法按照渗流-应力耦合和非耦合两张方式研究了不同降雨持续时间（1天、2天、3天、4天和5天）和降雨强度对边坡变形破坏的影响。通过在坡面不同位置（坡顶、坡中、坡尖）设置监测点,观察并比较每次降雨后孔隙水压力的变化、变形规律和稳定性。煤矸石的高渗透性与在坡趾附近观察到的因水流而产生的最大变形进一步解释了坡体向下运动的原因,与现场观测和物理模型的观测结果有较好的一致性。研究结果还表明,渗透率的增加导致孔隙水压力的滞后性增加,土坡稳定系数下降。耦合分析中的安全系数（应力和孔隙水压力的耦合效应）与未耦合分析（水力反应效应）相比显着降低。为防止边坡进一步破坏,防止其对道路交通的影响,采用锚固与水平排水相结合的设计。建议在边坡顶部采用混凝土梁锚杆加固路基,在坡脚附近设置桩排。引入水平排水系统,分流雨水,保护边坡和道路的顶部和底部。采用极限平衡Bishop法分析了桩锚加固的效果,评价了加固方案对边坡安全系数的影响。结果表明:桩锚加固土边坡的安全系数由0.9提高到1.14;利用工程价值研究,在滑坡区设计水平排水系统,控制滑坡体内过量降雨入渗,保护坡顶和坡底道路,分流雨水。
解冰[3]（2021）在《中国学生在线英语写作同伴互评学习投入历时性研究》文中研究说明近年来,语言教育工作者不断探索如何以计算机为媒介实施同伴互评和培养写作技能。研究发现,只要同伴之间的交流清晰、有建设性,且评语能被采纳,在线同伴互评就能成为有效学习的催化剂（Kasch et al.,2021）,向对方学习和与对方学习都能促使学生反思自身写作（Liu&Hansen Edwards,2018;Race,2014）。此外,同伴互评还有助于减轻教师负担增加生生互动（Cho&Schunn,2007;Wanner&Palmer,2018）。鉴于此,有关互评活动设计与实施的研究层出不穷,但学习者在同伴互评中的学习投入研究尚未引起外语教学研究者的足够重视。尽管有学者开始探究同伴互评中的学习投入情况（如Fan&Xu,2020;Hoo et al.,2020）,但现有文献主要聚焦于学生作为反馈的接受者如何投入到文本修改过程中,而从反馈提供者视角调查学习投入的特征和发展轨迹的研究相对匮乏。以计算机为媒介的在线同伴互评为探究学习投入和学业表现在不同的时间尺度上的动态关系提供了新视角。本研究将在线同伴互评（online peer review）界定为提供与接受同伴反馈的交互性在线学习活动,是一系列以作文修改为导向的学习活动的总称。在线同伴互评要求学生上传作文初稿后,先作为评价者向同伴提供反馈,再作为被评价者对所收到的评语有效性进行回评,并修改作文。同伴反馈（peer feedback）是学生以评价者身份指出对方作文优缺点并提供修改意见的行为,是同伴互评的一个重要环节。在前人研究的基础上,本文将在线同伴互评学习投入界定为学生对在线平台随机分配的同伴作文提供反馈评语时所付出的努力,包括行为、认知和情感三个维度。具体而言,行为投入是学生在行为层面的参与程度,可以从指向修改的批评、有根据的表扬和单纯表扬三个子维度进行研究;认知投入分析的主要依据是互评评语中的认知特征,如识别、定位、建议、解决和解释;情感投入是学生以评价者身份参与同伴互评的感受和情绪,通过文本情感分析进行阐释。心流理论（Flow Theory）、过程写作法和合作学习理论为诠释外语语境中的在线同伴互评学习投入提供了理论基础。心流或心流体验是积极心理学的概念,是一种全身心投入的状态,个体完全沉浸在具有挑战性的心理、情感或学习活动中,从而暂时忘却周围的任何事物（Csikszentmihalyi,1996;Egbert,2003）。本研究中的核心要素与触发心流体验的必要条件相契合,如技能—挑战平衡、明确的目标、控制感和持续的反馈。此外,过程写作法为研究中的多人互评和多稿写作提供了依据。合作学习理论也为构建在线学习共同体和同伴支架提供了理论支持。本探索性研究历时两个学期,以某研究型大学英语专业一年级三个自然班级的76名学生为研究对象,在基础英语写作课程中基于Peerceptiv组织在线同伴互评。依据评价标准和评语提示,学生从四个维度提供反馈评语:基于Toulmin模型的议论文要素（Qin&Karabacak,2010;Toulmin,1979,2003;Verheij,2005）、论证的有效性、语法和词汇、以及语言风格。具体而言,本文旨在探究以下研究问题:1.英语专业本科一年级学生作为评价者,如何实质性地投入到在线同伴互评活动中?2.学生如何评价自己在提供同伴反馈时的学习投入情况?3.在四轮同伴互评活动中,学生的学习投入如何影响其互评表现?为探究以上问题,本研究收集了多种来源的定性和定量数据,包括1217份互评评语、304篇议论文初稿、1217份回评评语、304篇反思日志、半结构化访谈语料和同伴互评学习投入在线调查数据。数据分析包括五个部分:1)切分互评评语为22194个最小意群（对同一话题的连续评论）,以揭示学生实质性的行为和认知投入情况,以及评语质量和数量;2)对反思日志进行文本情感分析,以探究情感投入度;3)学习投入量表定量分析,以揭示学生如何感知自我学习投入度;4)对四个话题的议论文初稿进行评价,以考察英语写作水平发展情况;5)对访谈语料和回评评语进行定性分析。研究中,所有文本数据均由多名受过专业训练的助研人员进行编码和统计;定量数据采用SPSS 20.0进行处理。从整体上看,学生在四轮在线同伴互评活动中能够积极地参与到反馈任务中,并在行为和认知上持续投入。研究还发现,学习投入三个维度间的关系在不同阶段都具有一致性,即行为投入和认知投入之间存在显着的高度正相关关系;但情感投入与这两个维度的正相关系数较低。本文还对学生行为、认知和情感投入的显着特征和发展轨迹进行了深入讨论。为回答第二个研究问题,本研究使用自主开发的学习投入量表测量学生自我感知的学习投入程度。从整体上看,研究对象的学习投入自我感知较为积极;在线表现、人际沟通、反馈策略、任务管理、评价者信心和互评价值认同等六个因子与学习投入之间具有显着的正相关关系。最后一个研究问题聚焦学习投入和互评表现之间的关系。研究证实,学生在同伴反馈中的行为投入越积极、且认知投入越多元,个体就越有可能向同伴提供篇幅较长且质量较好的评语,并有助于提高自身写作质量。在四轮互评中,学生的评语的数量和质量都保持了持续增长的趋势。多元线性回归的结果显示,学习投入三个维度构成的组合可以解释评语数量和质量60%以上的变异,其中认知和行为投入具有较强的解释力。学生四轮议论文初稿写作成绩平均分具有显着性差异。重复对比检验也显示,除议论要素以外,其他三个写作维度的成绩均呈现显着上升趋势。此外,学生的整体写作发展与行为投入和认知投入有显着的中度正相关,尤其是认知投入中的识别、解决方案和建议等认知投入以及行为投入中的纠正性批评都有助于提高英语写作质量;而情感投入与写作成绩提高幅度的相关性较低。研究进一步发现,英语水平对学生的实质性学习投入程度和自我感知的投入程度没有影响,高水平和低水平学生在同伴评论的数量和质量上也没有显着差异。虽然前者在写作质量上比后者有优势,但随着学生参与更多轮次的同伴互评活动,二者间的差距不断缩小。这一发现具有积极启示意义,可以在一定程度上打消教师因为学生英语水平参差不齐而对同伴互评所产生的顾虑。无论英语水平高低,只要教师能加以引导并合理实施,英语专业一年级学生便能在行为、认知和情感等层面上积极投入。虽然学习投入度会随时间的推移而产生波动,但总体仍呈上升趋势。这意味着,当学生从同伴互评中受益时,投入度得以保持和提高。同时,学习投入度越高,学业表现越符合预期。综上,本研究对拓宽外语写作同伴互评学习投入研究、构建同伴互评学习投入分析框架、拓宽外语写作教学研究视角进行了有益探索。鉴于学习投入的重要性和同伴互评的教学优势,未来可进一步对比不同互评模式下学习投入的特征,探究影响学习投入的环境因素以及学习者个体差异对学习投入的影响。
叶培枫[4]（2021）在《抛锚式教学模式在大学英语阅读教学中的实证研究》文中研究表明英语阅读是信息获取和语言输入的重要组成部分,在培养学生的语言运用能力中发挥着重要作用。阅读教学关系到英语教学的整体水平。但是目前大学生英语阅读教学现状不容乐观。当下,绝大多数教师仍然沿用传统的自下而上的阅读教学模式,大学英语课堂仍在沿用将教师的“讲”放在主体地位,课堂教学以词汇短语和语法知识作为教学重点,而将学生的“学”摆在被动位置的常规教学模式。长期以来导致学生阅读成绩不理想,从而造成阅读能力和阅读兴趣逐渐下降,最终学生的语言综合运用能力也得不到发展。抛锚式教学是以建构主义理论,情境认知理论以及合作学习理论为基础形成的一种教学模式。抛锚式教学注重以学生为中心,强调学习的主动性,通过创设真实情景,引导学生通过与小组成员间的相互协作、交流。最终使学习者主动实现对所学知识的意义建构。对于抛锚式教学模式国内外研究者主要集中在自然学科领域,然而,关于抛锚式教学在大学公共英语阅读教学中应用的实证研究相对较少。因此,笔者将在前人研究的基础上,使用抛锚式教学模式在大学公共英语阅读课堂上进行实证研究。本研究旨在回答以下两个问题:1.抛锚式教学的应用能否提高大学生的英语阅读成绩?2.抛锚式教学在英语阅读教学中的应用能否引起大学生对英语阅读的兴趣?笔者以选取西北民族大学非英语专业的两个大学一年级平行班的学生作为研究对象。将其中一个班设置为实验班,英语阅读教学中采用抛锚式教学模式;另一个班为控制班,采用常规教学法进行教学。本次实验持续17周,在实验中,笔者分别回收来自于两次调查问卷、三次测试和一次访谈的实验数据并最终通过SPSS.22.0统计软件进行分析,旨在验证抛锚式教学模式在大学英语阅读教学中的成效性。经过一个学期的教学实验,实验班学生的英语阅读成绩明显高于控制班。对实验班的问卷调查和访谈中,我们不难看出抛锚式教学模式的应用可以提高学生的英语阅读成绩同时激发学生的阅读兴趣。与常规的英语阅读教学模式相比,抛锚式教学模式取得了良好的成效,深受广大师生的认同。
Amna Saeed Mohammed Awadh[5]（2021）在《Research on Bearing Capacity and Stability of Slope Supporting Composite Structure with Framed Pre-Stressed Anchor Bar and Sheet Pile Wall》文中研究指明随着城市规模的快速发展,城市土地空间日趋紧张。随着基坑工程规模和深度的不断扩大,框架预应力锚杆和板桩墙施工速度快,造价低,在基坑工程中得到了广泛的应用。在实际岩土工程中,利用有限元法进行边坡稳定性分析是一种先进的方法,得到了广泛的应用。随着计算机技术的发展,采用基于位移的有限元数值分析方法来研究框架-预应力锚杆板桩墙支护边坡的稳定性,计算安全系数变得越来越容易。具体研究内容和结论如下:（1）膨胀角ψ’未被广泛覆盖。本文采用PLAXIS二维有限元法建立了框架预应力锚杆-板桩墙支护边坡模型,研究了膨胀角对边坡变形的影响。（2）采用预应力锚索桩墙支护的基坑,分析了土体参数和锚杆设计参数对基坑稳定性和水平位移的影响。结果表明,土体参数对基坑的稳定性和水平位移有很大影响,因此在基坑支护设计过程中应选择合理的计算参数,结果表明锚固件的数量对基坑稳定性有很大影响,但对基坑支护的影响较大。（3）本文总结了桩侧土压力的计算,首先阐述了土压力的分布,详细分析了作用在支护桩上的静土压力、主动土压力和被动土压力,并总结了三者的计算方法和公式。主要分析了作用在支护结构上的土压力特性以及不同土层的计算与测量误差。
曹俊才[6]（2020）在《煤矿巷道预应力锚杆时效支护理论研究》文中研究说明巷道的开挖与支护是一个非线性过程,不同的开挖强度、开挖速度、开挖方式、开挖工艺、支护时机、支护参数,导致了不同的围岩变化规律和不同的围岩损伤程度。围岩的损伤变形与时间密切相关,由于围岩的时效机理复杂,造成合理的支护形式和支护时机确定困难。针对围岩的时效支护问题,本文构建了时效围岩的理论模型,推导了围岩的扰动边界与时间的关系函数,确定了时效围岩应力和位移的解析计算方程,探究了预应力锚杆的时效支护机理,给出了预应力锚杆与围岩相互作用的应力、变形计算方法;研究了锚杆的支护长度和预应力的最优匹配值,揭示了锚杆托盘的应力扩散机制;提出了超级预应力锚杆支护的理念,探讨了超级支护与时效支护的关系;编制了时效围岩的计算软件,给出了时效计算软件的工程算例。主要取得以下进展:（1）揭示了围岩扰动范围随应力传递时间变化的规律。巷道围岩的扰动范围与时间的二次方根成正比;随着时间的推移,围岩扰动范围的变化分为两个阶段:首先是急速变大,然后是缓慢衰减;在急速变大阶段的扰动范围一般为巷道半径的3～5倍;岩性极差的围岩容易在急速变大阶段发生失稳,缺失缓慢衰减阶段。（2）研究了围岩时效变化的对称性原理。时效围岩持续变化和发展的根本原因是对称性或缺,围岩的对称性或缺主要包括围岩深部和浅部的应力不对称和变形不对称两方面;减弱时效围岩的应力不对称和变形不对称有助于长时稳定支护,大幅提高支护预应力可以有效减弱围岩的应力和变形不对称。（3）探索了预应力锚杆支护的时效性。预应力锚杆在支护过程中,随着围岩的时效变形,锚杆轴力发生了变化;当锚杆轴力超过了临界拉拔力时,锚固界面发生渐进脱粘,使得锚杆自由段和锚固段长度发生了变化,影响了锚杆的临界预应力和锚固盲区的范围;同时,锚杆轴力的时效变化改变了托盘的弹性变形、蠕变变形和受力状态,影响了托盘的应力扩散规律;这些都表现出了锚杆支护的时效性。（4）揭示了锚杆自由段长度和临界预应力之间的关系。预应力锚杆支护存在两个有效压应力区,锚固段有效压应力区和自由段有效压应力区;随着预应力的不断增大,两个压应力区逐渐靠近,最终融合;当两个压应力区即将融合时,锚杆的预应力为临界预应力;不同长度的锚杆具有不同的临界预应力,锚杆自由段的长度越长,临界预应力越大。（5）探究了锚杆长度、预应力对锚固盲区的影响。预应力的大小不能改变锚固盲区的范围,只能缓解盲区的受力环境;锚固盲区的范围与锚杆的长度有关,锚杆自由段长度越长锚固盲区范围越大;锚固盲区的岩体主要靠岩体自身的强度自稳和护表网片等维护;锚固盲区不能自稳时,缩小锚杆间排距是最有效的方法之一。（6）分析了锚杆托盘的应力扩散机制。锚杆轴力不能完全反映锚杆支护的真实工况,还需要结合托盘的受力和变形;托盘应力呈中间大?边缘小的分布规律;托盘的尺寸越大?厚度越厚,围岩变形过程中,锚杆支护增阻越快,控制围岩变形越有效;大托盘受力面积大、支护范围广,有利于提高围岩的护表能力,缺点是大托盘的边缘力矩较大,不利于托盘的受力优化,容易变形。（7）提出了超级支护的理念。施加预应力超过锚杆最优预应力的支护方式称为超级支护,锚杆最优预应力取锚杆临界预应力的40%。试验表明,超级锚杆支护可以显着改善围岩的应力环境,可以延缓和抑制围岩的变形速度、缩小围岩的损伤范围,可以改善特定环境下特定位置的疑难支护问题;能够扩大锚杆支护的间排距,而不降低支护的整体强度,这有助于巷道快速掘进。（8）设计了实现超级预应力的组锚杆结构。组锚杆结构是将多个杆体安装在一个托盘上,并将锚杆均匀布置在了托盘的边缘附近;组锚杆的优势在于可以集中支护?节约支护空间,可以匹配空间资源稀缺的智能掘进;组锚杆结构有利于快速实现超级预应力支护,有利于弱化托盘的边缘力矩,有利于托盘预应力的长期维持。（9）编制了模拟预应力锚杆时效支护的计算软件。该软件不仅可以模拟时间作用下巷道围岩的变化规律,还可以综合模拟开挖?支护?回采及下一个工作面接续全过程,实现了超大尺寸模型的精细化求解;计算模型的尺寸可以依据研究对象尺度灵活放缩。该论文有图87幅,表5个,参考文献217篇。
Divine Setsofia[7]（2020）在《通货膨胀目标制对撒哈拉以南非洲货币政策的影响：综合控制方法》文中指出Inflation targeting（IT）has proven to be an efficient monetary policy in countries which have adopted it;both developed and developing countries.This study examines the concerns of whether Inflation Targeting is effective in controlling inflation and improving GDP growth in sub-Sahara Africa（SSA）using nonexperimental evaluation approach.To be precise,the study adopts Synthetic Control Method to evaluate the effect of Inflation Targeting on controlling inflation in 12 targeted countries in sub-Sahara Africa from 1998-2018.In order to have a clear indication of the findings,placebo effect test was also conducted to measure the impact of the IT.Also,the study employed regression analysis to examine the impact of inflation on the GDP growth performance in the targeted economies in SSA by assessing the relationship between GDP growth and Inflation in the targeted countries.The findings show that IT policy tool has significantly helped South Africa,Ghana,Democratic Republic of Congo and Zambia to reduce inflation.The remaining countries except Nigeria have experienced a reduction in their inflation after the adoption of the IT which indicate that IT is effective in the said targeted countries.Secondly,the findings from the regression analysis test show that inflation has significant negative impact on GDP performance in Ghana,Democratic Republic of Congo and Tanzania which indicate that IT could have positive impact on GDP growth with proper management of the policy tool with less practice of conventional banking system.The remaining targeted countries in SSA show that inflation has insignificant impact on GDP growth which posit that low inflation from IT policy tool shall have less impact to GDP growth.In a nutshell,the study recommends that countries in Sub Saharan Africa should ensure independence of the Central Bank,transparency and adherence to pre-conditions before inflation targeting is adopted.This is critical,because it establishes the real impact of the inflation targeting in the long run.
ELHAJ ABAKER IBRAHIM AHMED[8]（2020）在《多物理场电液静压机床主轴系统设计及振动响应因素优化研究》文中研究表明电动静压主轴系统（MMHS）是数控机床的关键部件,在其加工过程中起着重要作用,直接影响加工精度。由于转子动力学和热负荷效应,高速旋转的电动静压主轴系统将产生额外重量和对其部件的大量热传递。这种高速和热传递产生的额外重量会引起主轴系统产生高振动,因此,要达到其适当的加工效率是一个明显的挑战。近来,静液压机械主轴由于其克服了效率挑战的突出优点而得到快速发展。目前还缺乏充分考虑转子动力学和热效应的优化设计研究。本文旨在建立一种基于多物理场的综合仿真分析系统,以期在热损失和转子动力学影响下优化MMHS系统。仿真分为三个主要部分:电动静压主轴设计和计算流体动力学（CFD）分析,定子-转子的稳态热分析以及主轴系统的转子动力学分析。为了给电动静压轴颈轴承支承和CFD模型提供基本参数,设计了一种四槽轴颈轴承,它能有效地承受较大载荷,提供大刚度和阻尼。首先,利用流体静力学基本理论建立了轴颈轴承的通用数学模型。然后,通过应用Navier-Stocks和能量方法,建立了相应的速度场、压力场、承载能力、油膜刚度和温度升高的解析模型。通过在转子动力学分析和传热分析中使用有限元方法（FEM）,建立了 MMHS系统的综合热力学模型。提供L系列CN车床电动主轴来建立热力学模型,包括主轴动态模型、旋转盘模型、静压轴颈轴承模型和热模型。利用多物理场提出了影响MMHS系统振动特性因素的仿真分析方法。该方法可估计静态刚度、固有频率及其模态形状和稳态频率响应函数。通过应用相似性设计方法的原理,在MATLAB中进行编程、以及使用在支撑其轴承的制造主轴上建立的DH-VTC实验测试,验证了有限元分析。进一步,建立了考虑转子动力学和热效应的响应面模型,并进行了质量特性分析。Box-Behnken实验设计（BBD）由于其能够有效地在规定数量的统计实验中提供大量的数据,因此用来构建响应面优化的实验设计（DOE）。结果表明:静压轴承可以在不转动轴颈的情况下承受较大的载荷,并提供高的直接刚度和阻尼系数。静压轴承的承载能力和直接刚度不依赖于流体的粘度,因此,这使得它成为理想的转子支承元件。多物理综合仿真结果表明,与仅考虑切削力作用的有限元分析相比,定子转子体的温度对MMHS系统影响较大。转子的旋转不平衡力及其热损失对整个MMHS系统最大变形的贡献较大。结果还表明,由于电机转子处的轴向热应力导致主轴预紧,综合热应力参数对MMHS系统设计有较大影响。最后,从得到的优化设计结果中发现,所提出的方法不仅改进了 MMHS系统的结构重量,而且可在一定程度上节约材料和能源。研究发现,MMHS系统的材料损耗成本节省约20.18%,质量特性比原值节省12.48%。将优化RS模型的有限元分析结果与原模型的有限元分析结果进行比较,结果吻合的较好。本文在优化MMHS系统性能因素的基础上,对MMHS系统的传热与转子动力学综合分析及其对振动特性的影响进行了创新研究。它有助于（ⅰ）进一步了解热应力影响下主轴系统的静态转子动力学分析的物理特性,（ⅱ）验证了热传导预应力参数对转子动力学分析的影响,预测了其对MMHS系统振动特性的改善,以及（ⅲ）开发了一种有效的MMHS系统设计优化方法。然后,预测了在热传导预应力和转子动力学效应下MMHS系统振动特性的性能因子敏感性。
刘远洋[9]（2020）在《既有锚索边坡的预应力损失规律及对长期稳定性的影响》文中研究说明预应力锚索常用于岩土工程加固,但在工程服役期间不可避免地出现预应力损失现象。目前工程界多采用经验公式确定预应力损失量,对预应力长期松弛规律以及边坡稳定性影响的分析还不够。因此,展开对该两个方面的研究具有重要的理论指导和现实意义。首先,归纳总结了锚索锚固理论及预应力损失的常见影响因素,并按照预应力损失全过程的不同阶段,分析了在预应力短期损失与长期损失过程中,导致预应力亏损的主要影响因素。着重探讨在边坡工程的长期运营过程中,由于锚索灌浆体徐变损伤以及岩体蠕变效应引起的预应力长期损失机制及主要影响因素。其次,本文利用有限差分软件建立了预应力锚索锚固的岩质边坡数值模型,分别对考虑锚索灌浆体粘结强度、灌浆体粘结强度和切向刚度的耦合时效损伤情况进行数值仿真试验,探讨灌浆体的力学参数随时效损伤演化而发生改变时,不同工况下的预应力长期松弛规律;分析了上述两种条件下,锚索灌浆体时效损伤效应对边坡位移场、应力场、应变场的影响,并比较边坡安全系数和剪应变增量云图及塑性区可总结出对边坡长期稳定性影响规律。最后,对考虑蠕变效应的预应力锚索边坡进行了数值仿真试验,从不同蠕变工况下的轴力分布规律讨论了预应力损失的长期发展趋势;分析了岩体蠕变效应对边坡位移场、应力场、应变场的影响,比较边坡安全系数和剪应变增量云图及塑性区可发现对边坡长期稳定性影响规律。结果表明,预应力边坡工程中锚索灌注浆体的时效损伤效应导致预应力值下降,浆体损伤稳定后该值趋于不变,且边坡长期稳定性也随时间的发展而降低;在岩体长期蠕变影响下,预应力随蠕变发展到稳定阶段而减少至基本不变,该因素同样造成了一定程度上边坡稳定性的降低。
Tahir Khan[10]（2020）在《全长锚固锚杆剪应力分布研究》文中进行了进一步梳理本文从数值模拟和模型实验两方面研究了锚杆在拉拔轴力作用下的剪应力沿锚固深度的分布规律。大量研究表明,全长锚固锚杆的破坏大多情况下是由于在极限轴向荷载作用下,注浆体与锚杆界面之间的黏结失效引起的。鉴于上述课题的重要性,本研究采用试验与ABAQUS软件相结合的方法进行。主要研究内容如下:（1）数值研究方面,选用Abaqus软件进行了数值模拟,将基于有限元分析的理论结果和实验结果进行了比较。在软件中模拟了 4种直径分别为12.5,16,20和15mm的锚杆,并且考虑了光圆和带肋两种形式。对于每种类型的锚杆,各选用了4种混凝土与钢筋的弹性模量之比Ec/Eb,其值分别为0.2,0.1,0.05和0.025。深入研究了材料性质Ec/Eb)和锚杆几何尺寸（直径）对锚杆剪应力分布的影响。数值结果表明,第一,当Ec/Eb比值越小时,峰值剪应力值越高,说明峰值剪应力与Ec/Eb呈反比关系。第二,在拉拔力作用平面附近的剪应力更为明显。第三,随着锚杆直径的增大,峰值剪应力也随之增大。此外,计算结果与理论分析吻合较好。（2）在模型试验部分,选用了直径为20 mm的锚杆（带肋和光圆）。为了获得良好的数据,在每个锚杆的两侧各安装了 5个应变片。对于灌浆材料,水灰比取0.4。混凝土养护时间为7天。利用预应力电动油泵和液压千斤顶进行了拉拔试验。试验数据由甘特恩仪器最新型号的数据采集装置进行收集。结果表明,使带肋锚杆黏结材料失效所需的轴力比普通锚杆大2/3左右。模型试验的结果也验证了理论分析和仿真结果的正确性。
二、Behavior of pre-stress group anchors——Theory approach and model（论文开题报告）
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功能分析法：这是社会科学用来分析社会现象的一种方法，从某一功能出发研究多个方面的影响。
模拟法：通过创设一个与原型相似的模型来间接研究原型某种特性的一种形容方法。
三、Behavior of pre-stress group anchors——Theory approach and model（论文提纲范文）
（1）摩洛哥货币政策实现通货膨胀应对的有效性研究（论文提纲范文）
| 中文摘要 |
| Abstract |
| List of abbreviations |
| General introduction |
| Research background |
| The choice and interest of the subject |
| The issue of the subject |
| The objectives of this work |
| The assumptions of the work |
| Structure of the study |
| FIRST PART THE FRAMEWORK CONCEPT AND PRACTICE OF THE POLICY OF INFLATION TARGETING |
| Introduction of the first part |
| Chapter Ⅰ Conceptual framework |
| Introduction |
| Ⅰ- The monetary policy and inflation targeting nominal anchoring regimes |
| A-Anchoring by the exchange rate |
| B- Anchoring by the monetary aggregates |
| Ⅱ_The policy of inflation targeting |
| A- The motivation of the emergence of the policy of inflation targeting |
| B- Definition of inflation targeting in the literature |
| C- The advantages and the disadvantages of the strategy of inflation targeting |
| a-The advantages of inflation targeting |
| b-The disadvantages of inflation targeting |
| Ⅲ-The performance of the regime of inflation targeting in the emerging country |
| A- The achievement in terms of inflation |
| B- The achievement in terms of economic growth |
| Conclusion |
| Chapter Ⅱ The framework for the conduct of monetary policy |
| Introduction |
| Ⅰ-The monetary policy between discretion and rules |
| A- The monetary policy discretionary |
| B- The reasons for the rebate in case of monetary policy discretionary |
| C- The development of the literature on the credibility of monetary policy |
| Ⅱ- The emergence of rule monetary policies |
| A- Presentation of the traditional Taylor rule |
| B- The critics of the Taylor rule |
| C- The development of monetary rules to the new rules of Type Taylor |
| D- The rule of McCallum An alternative rule of monetary policy |
| Ⅲ-The optimal rules for the regime of inflation targeting |
| A- The flexible rule to inflation targeting |
| B- The strictly rule to inflation targeting |
| C- The optimal inflation targeting rule |
| Conclusion |
| Chapter Ⅲ The prerequisites for adopting inflation targeting |
| Introduction |
| Ⅰ-The literature on the condition prior to the adoption of inflation targeting |
| A- The issue of the prerequisites for the adoption of inflation targeting |
| B- The literature on the condition prior to the adoption of inflation targeting |
| Ⅱ-Institutional prerequisites for the conduct of inflation targeting monetary policy |
| A- The independence of the central bank |
| B- The transparency of the central bank |
| C- The responsibility of the central bank |
| Ⅲ- Economic and technical preconditions |
| A- The economic preconditions |
| a- Budget discipline |
| b- The depth and the development of financial system |
| c-The flexibility of the system of exchange |
| B- The preconditions operational and technical |
| a-The choice of a measure to target inflation |
| b-The determination of the inflation targeting |
| c-The choice of the horizon time adequate to the achievement of the target |
| d-The infrastructure technical progress |
| Conclusion |
| Conclusion of the first part |
| SECOND PART THE STRATEGY OF INFLATION TARGETING IN THE CONTEXT OF MOROCCO |
| Introduction of the second part |
| Chapter IV Evolution of the framework and practices of monetary policy in Morocco |
| Introduction |
| Ⅰ The organization of bank al-maghrib from 1959 and the emergence of the central bank |
| A- Decolonization and nationalization of the Bank of Morocco |
| B- The national bank issue model |
| C- Bank Al-Maghrib and turning of Structural Adjustment |
| D- Determinants of the adaptation of monetary environment |
| a- The financial environment experiencing profound changes |
| b- Weaknesses in the monetary system before the reforms |
| c- Objectives related to the reform of the monetary system |
| E-Genesis of the monetary policy in Morocco |
| a- The share of control Direct credit to the economy |
| b- The share of control directly from the liquidity bank |
| c- The policy of the interest rate given |
| Ⅱ Transmission mechanism of monetary policy in Morocco |
| A- Monetary policy Bank Al-Maghrib |
| a- Abandoning Direct controls and the liberalization of rates interest |
| b- Modernizing of intervention Bank Al-Maghrib |
| B- Monetary policy in Morocco since the reforms of the 2000s |
| a- A strategic framework that makes price stability a priority |
| b- An operational framework marked |
| C- The transition to a monetary policy rule in Morocco |
| a- The redesign of the determination of the objectives of the monetary policy |
| b- The overhaul in the instruments of the monetary policy |
| Ⅲ-The monetary policy in Morocco toward a strategy of inflation targeting |
| A- The primacy of the price stability in terms of monetary policy in Morocco |
| B- The new framework analytical of the monetary policy in Morocco |
| C- Monetary policy instruments during the current phase |
| a-The instruments of the monetary policy used to the initiative of BANK AL-Maghrib |
| b-The operations at the initiative of the banks |
| c-The monetary reserve |
| D- effectiveness of the policy in bank al maghrib |
| a- The theoretical basis of a policy based on monetary aggregates |
| b- Money demand function in Morocco and study of its stability |
| c- Implication |
| instability the demand for money the effectiveness of Monetary policy in Morocco |
| d- Evaluation of the setting in implementing the decisions newest of the monetary policy |
| Conclusion |
| Chapter V Existing problems of the Moroccan monetary policy transmission mechanism |
| Introduction |
| Ⅰ- Monetary policy transmission channels |
| A- The different channels of transmission of the monetary policy |
| a-channel traditional of the interest rate |
| b-The channel of credit |
| c-The channel of exchange rate |
| d-The channel of the prices assets |
| B- The transmission specifications of monetary policy in the countries in development |
| a-The impact of the underdevelopment of the financial system on the transmission of monetary policy |
| b-The impact of the fixed exchange rate regime |
| Ⅱ-Assessment of the monetary policy transmission environment in Morocco |
| A- The channel of interest rate in Morocco |
| B- The channel of credit in Morocco |
| C- The price channel of financial assets |
| D- The exchange rate channel in Morocco |
| a-Towards a new monetary policy |
| b-The co-integration tests |
| Ⅲ- Empirical evaluation of the transmission mechanisms of monetary policy in Morocco |
| A- Origin of the modeling Vector autoregressive VAR |
| B- Review of empirical literature relating to the use of the VAR model to study monetary transmission |
| C- Data and methodology |
| a-Specification of the model |
| b-The justification for the choice of variables |
| D- The order of variables Study of the stationary |
| a-The stationarity of the weighted average rate interbank TMP |
| b-The stationarity of the variable credit to the private sector |
| c-The stationarity of the variable GDP real |
| d-The stationarity of the variable CPI |
| e-The stationarity of the MASI variable t |
| E- Estimation and verification of the stability of the VAR model |
| a-Study of the stability of the VAR model |
| b-Determination of the number of delay optimal for the model VAR |
| c-The functions of response impulse |
| d-The decomposition of the variance |
| F- Reconciliation and comparison of the results obtained |
| Chapter VI Assessment of the preconditions for the implementation of inflation targeting in Morocco |
| Introduction |
| Ⅰ-Assessment of institutional preconditions for inflation targeting in Morocco |
| A- Assessment of the degree of independence of the Moroccan central bank |
| a-Assessment of the legal independence of Bank Al-Maghrib by the Cukierman index |
| b-Evaluation of the index of independence actual Bank Al-Maghrib |
| B- Evaluation of the transparency and communication of BANK Al-Maghrib |
| a- The communication documented in Bank Al-Maghrib |
| b- Direct communication with the public |
| Ⅱ Assessment of economic preconditions for inflation targeting in Morocco |
| A- Evaluation of the discipline budget in Morocco |
| a-Analysis of the budget deficit in Morocco |
| b-Analysis of the evolution of the debt public |
| B- Assessment of the adequacy of the Moroccan exchange rate regime with the requirements of inflation targeting |
| a-Reading of the current exchange rate regime in Morocco |
| b-Evaluation of prerequisites to the flexibility of exchange in Morocco |
| C- Assessment of the depth of the Moroccan financial system |
| a-The depth of the Moroccan banking sector |
| b-The depth of financial markets in Morocco |
| Ⅲ-Assessment of technical preconditions in Morocco |
| A- The device informational of Bank Al-Maghrib |
| a-Expansion of monetary statistics of Bank Al-Maghrib |
| b-The eve informational by the investigations of Bank Al-Maghrib |
| B- The measurement of inflation in Morocco |
| a-The consumer price index An innovation in the measurement of inflation |
| b-The measure of inflation by the method of exclusion |
| C- The technical device of Bank Al-Maghrib in terms of the forecast inflation |
| Conclusion second part |
| Recommendation |
| General conclusion |
| English references |
| French References |
| Appendix |
| Papers |
| Acknowledgements |
| 学位论文评阅及答辩情况表 |
（2）降雨入渗触发非饱和煤矸石堆积边坡失稳的机理研究（论文提纲范文）
| 摘要 |
| Abstract |
| LIST OF ABBREVIATIONS |
| CHAPTER 1 Introduction |
| 1.1 Concept of slope failure |
| 1.2 Mechanism of slope instability and types of failures |
| 1.3 Factors affecting slope failure |
| 1.4 Background of study |
| 1.5 Problem statement and content of research |
| 1.6 Research route model |
| CHAPTER 2 Concepts and methods in soil slope failure analysis |
| 2.1 Unsaturated soil mechanics |
| 2.2 Stability of Slope |
| 2.3 Permeability |
| 2.3.1 Applications of permeability in slope engineering |
| 2.3.2 Permeability usage |
| 2.4 Hydraulic conductivity (K) |
| 2.4.1 Darcy’s Law |
| 2.4.2 Permeability test (Constant-Head) |
| 2.4.3 Permeability test (Falling-Head) |
| 2.5 LEM for analyzing slope stability |
| 2.6 Finite element method (FEM) |
| 2.7 Slope reinforcement techniques |
| CHAPTER 3 Engineering Geological conditions of coal gangue accumulated landslide |
| 3.1 Geography |
| 3.2 Hydrometeorological conditions |
| 3.3 Geology |
| 3.3.1 Stratigraphic distribution |
| 3.4 Characteristics of Landslide |
| CHAPTER 4 Numerical simulations of landslide by considering rainfall infiltration as atriggering factor |
| 4.1 Methodology |
| 4.1.1 Testing of soil properties |
| 4.1.2 Numerical simulations by finite element method (FEM) |
| 4.1.3 Governing equations |
| 4.2 Results |
| 4.2.1 Pore-water pressure |
| 4.2.2 Strain generation |
| 4.2.3 Response of deformation |
| 4.2.4 Safety factor |
| 4.3 Discussion |
| 4.3.1 Influence of rainfall infiltration in the change of pore-water pressure |
| 4.3.2 Mechanism in the distribution of strain |
| 4.3.3 Effect of rainfall infiltration process on deformation response |
| 4.3.4 Influence of rainfall infiltration process on safety factor |
| CHAPTER 5 Control scheme and stabilization of landslide |
| 5.1 Introduction |
| 5.2 Control scheme for Landslide |
| 5.2.1 Horizontal drainage in landslide |
| 5.2.2 Main components of drainage design |
| 5.3 Stabilization of Landslide |
| 5.3.1 Ground Anchorages |
| 5.3.2 Piles |
| 5.3.3 Anchorages and beam coupled with piles stabilization |
| CHAPTER 6 Conclusions and Recommendations |
| 6.1 Conclusions |
| 6.2 Recommendations |
| LITERATURE CITED |
| Self Introduction and Scientific Research Achievements During Master Degree |
| ACKNOWLEDGEMENTS |
（3）中国学生在线英语写作同伴互评学习投入历时性研究（论文提纲范文）
| Abstract |
| 摘要 |
| List of Abbreviations |
| Chapter 1 Introduction |
| 1.1 Research Background |
| 1.1.1 Peer Review Practice in L2 Writing |
| 1.1.2 Student Engagement in Peer Review Activities |
| 1.1.3 Issues in Argumentative Writing |
| 1.2 Theoretical Rationale |
| 1.3 Objectives and Necessity of the Present Study |
| 1.4 Thesis Structure |
| Chapter 2 Literature Review |
| 2.1 Peer Review in ESL/EFL Writing |
| 2.1.1 Defining Peer Review and Peer Feedback |
| 2.1.2 Studies on Peer Comments |
| 2.1.3 Reported Effectiveness of Peer Review |
| 2.1.4 Factors Influencing the Effectiveness of Peer Review |
| 2.2 Understanding Student Engagement |
| 2.2.1 Earlier Conceptualization |
| 2.2.2 Engagement as a Process and Outcome |
| 2.2.3 Engagement as an Indicator and Facilitator |
| 2.3 Constructs of Student Engagement |
| 2.3.1 Emotional Engagement |
| 2.3.2 Behavioral Engagement |
| 2.3.3 Cognitive Engagement |
| 2.3.4 The Interplay of Engagement Dimensions |
| 2.4 Assessing Student Engagement |
| 2.4.1 Self-report Surveys |
| 2.4.2 Interviews |
| 2.4.3 Observations |
| 2.4.4 Textual Analysis |
| 2.5 Empirical Studies of Student Engagement with L2 Learning |
| 2.5.1 Frameworks of Domain-specific Student Engagement |
| 2.5.2 Relationships between L2 Students’ Engagement and Learning Outcomes |
| 2.6 Student Engagement in Peer Review of Writing |
| 2.7 Summary |
| Chapter 3 Theoretical Foundations and Analytical Framework |
| 3.1 The Process Approach to Writing |
| 3.1.1 Concepts of the Process Writing Approach |
| 3.1.2 Peer Review and the Process Writing Approach |
| 3.2 Cooperative Learning Theory |
| 3.3 Flow Theory |
| 3.3.1 Flow Theory in Educational Psychology |
| 3.3.2 Flow and Language Acquisition |
| 3.4 Conceptual Framework of Student Engagement in Online Peer Review |
| Chapter 4 Research Design |
| 4.1 An Overview |
| 4.2 Research Questions |
| 4.3 Course Context |
| 4.3.1 Macro Context of EFL Writing Instruction in China |
| 4.3.2 Teaching Objectives and Procedures |
| 4.3.3 Training to Facilitate Active Engagement in Peer Review |
| 4.3.4 Peer Review Support Structure |
| 4.3.5 Procedures of Online Peer Review Activities in Two Semesters |
| 4.4 Participants of the Study |
| 4.5 Instruments |
| 4.5.1 A Self-report Scale for Assessing Student Reviewers’ Engagement |
| 4.5.2 Interviews |
| 4.5.3 English Proficiency Tests |
| 4.5.4 Reflective Journals |
| 4.6 Data Sources and Coding Processes |
| 4.6.1 Peer Comments and Students’ Writing Drafts |
| 4.6.2 Coding Idea Units of Peer Comments |
| 4.6.3 Sentiment Analysis of Students’ Reflective Journals |
| 4.6.4 Assessing the Quality of English Argumentative Essays |
| 4.7 Analytical Framework for the Present Study |
| Chapter 5 Student Engagement in Online Peer Review |
| 5.1 Behavioral Engagement |
| 5.1.1 Levels of Behavioral Engagement |
| 5.1.2 Salient Features of Behavioral Engagement |
| 5.1.3 Development Trajectories of Behavioral Engagement |
| 5.2 Cognitive Engagement |
| 5.2.1 Levels of Cognitive Engagement |
| 5.2.2 Salient Features of Cognitive Engagement |
| 5.2.3 Development Trajectories of Cognitive Engagement |
| 5.3 Emotional Engagement |
| 5.3.1 Sentiment Values of Polarity |
| 5.3.2 Distinctive Emotional Traits |
| 5.3.3 Development Trajectories of Emotional Engagement |
| 5.4 Comparing HP and LP Students’ Engagement |
| 5.5 Correlation of the Three Dimensions of Engagement |
| Chapter 6 Self-report Engagement and Its Correlation with Substantive Engagement |
| 6.1 Peer Reviewers’ Self-report Engagement |
| 6.1.1 Online Performance |
| 6.1.2 Value Recognition |
| 6.1.3 Feedback Strategies |
| 6.1.4 Task Management |
| 6.1.5 Reviewer Confidence |
| 6.1.6 Interpersonal Communication |
| 6.2 Correlation among the Six Factors |
| 6.3 Comparing Self-report Engagement between the HP and LP Students |
| 6.4 Correlation between Self-report and Substantive Engagement |
| Chapter 7 Performance Outcomes of Student Engagement |
| 7.1 Thoughts on Choosing Performance Outcome Indicators |
| 7.2 Peer Comment Quantity |
| 7.2.1 Development of Comment Word Count |
| 7.2.2 The Longer, the Better? |
| 7.3 Peer Comment Quality |
| 7.3.1 Proportion of Peer Comment Quality Indicators |
| 7.3.2 Changes of Peer Comment Quality Grades |
| 7.3.3 Deficiencies of Peer Comments |
| 7.4 Development of Argumentative Writing |
| 7.4.1 Overall Quality |
| 7.4.2 Argument Components |
| 7.4.3 Effectiveness of Argumentation |
| 7.4.4 Grammar and Vocabulary |
| 7.4.5 Language Style |
| 7.5 Comparing Performance Outcomes between HP and LP Students |
| 7.5.1 Peer Comment Quantity |
| 7.5.2 Peer Comment Quality |
| 7.5.3 Argumentative Writing Development |
| 7.6 Correlations between Student Engagement and Performance Outcomes |
| 7.6.1 Engagement and Peer Comment Quantity |
| 7.6.2 Engagement and Peer Comment Quality |
| 7.6.3 Engagement and Argumentative Writing Development |
| Chapter 8 Discussion |
| 8.1 Issues in Students’ Substantive Engagement |
| 8.1.1 Substantial Behavioral Efforts Invested into Revision-oriented Criticism |
| 8.1.2 Active Cognitive Engagement as Evident in Peer Comments |
| 8.1.3 Positive Emotional Engagement over Time |
| 8.2 The Match between Students’ Self-report and Substantive Engagement |
| 8.2.1 Self-report Scale Presenting a Comprehensive Snapshot of Engagement |
| 8.2.2 Flow Experience Fostering the Perception of Being Engaged |
| 8.2.3 Empowerment Mechanisms to Optimal Engagement in Online Peer Review |
| 8.3 The Impact of Engagement on Performance Outcomes |
| 8.3.1 Positive Correlations between Engagement and Performance Outcomes |
| 8.3.2 Feedback Givers’ Development of Reader Awareness |
| 8.3.3 EFL Writing Development along with Engagement |
| 8.4 Revised Conceptual Framework for Engagement in Peer Review |
| Chapter 9 Conclusion and Implications |
| 9.1 Major Findings |
| 9.2 Pedagogical Implications |
| 9.2.1 Supporting Student Engagement in Offering Peer Feedback |
| 9.2.2 Gaining an Insight into Pedagogical Innovation |
| 9.2.3 Empowering EFL Learners to Writing |
| 9.3 Limitations and Implications for Future Research |
| References |
| Appendix 1 Peer Review Comment Prompts and Scoring Rubric for EFL Argumentative Writing |
| Appendix 2 Self-report Scale of Student Engagement in Peer Review of EFL Writing |
| Appendix 3 Interview Protocol |
| Appendix 4 Assessment Sheet for Expert Raters |
| Appendix 5 List of Publications during Doctoral Study |
| Acknowledgements |
（4）抛锚式教学模式在大学英语阅读教学中的实证研究（论文提纲范文）
| 摘要 |
| Abstract |
| Chapter1 Introduction |
| 1.1 Research Background |
| 1.1.1 The Importance of English Reading |
| 1.1.2 Current Situation of College Students’ English Reading |
| 1.2 Research Purpose |
| 1.3 Research Significance |
| 1.3.1 Significance for Teachers |
| 1.3.2 Significance for Students |
| 1.4 Structure of the Thesis |
| Chapter2 Literature Review |
| 2.1 Reading |
| 2.1.1 Definition of Reading |
| 2.1.2 Models of Reading |
| 2.1.3 Research on English Reading Teaching Abroad |
| 2.1.4 Research on English Reading Teaching at Home |
| 2.2 Anchored Instruction |
| 2.2.1 Principles of Anchored Instruction |
| 2.2.2 Procedures of Anchored Instruction |
| 2.3 Research of Anchored Instruction Abroad and at Home |
| 2.3.1 Research on Anchored Instruction Abroad |
| 2.3.2 Research on Anchored Instruction at Home |
| 2.4 Research on Anchored Instruction in English Reading Teaching |
| 2.5 Summary |
| Chapter3 Theoretical Framework |
| 3.1 Constructivism |
| 3.2 Situated Cognition Theory |
| Chapter4 Research Methodology |
| 4.1 Research Questions |
| 4.2 Research Subjects |
| 4.3 Research Instruments |
| 4.3.1 Questionnaire |
| 4.3.2 Tests |
| 4.3.3 Interview |
| 4.4 Research Procedures |
| 4.5 The Process of Teaching |
| 4.5.1 Anchored Instruction in EC |
| 4.5.2 Regular Teaching Model in CC |
| 4.5.3 Samples of Anchored Instruction in EC and Regular Teaching Model in CC |
| 4.6 Data Collection and Analysis |
| Chapter5 Results and Discussion |
| 5.1 Results and Analysis of English Reading Ability |
| 5.1.1 Independent Samples Test |
| 5.1.2 One-Way Repeated Measures ANOVAAnalysis |
| 5.2 The Results and Analysis of English Reading Interest Questionnaire |
| 5.2.1 Independent Samples Test |
| 5.2.2 Paired Sample T-test |
| 5.3 Results and Analysis of Attitude towards Anchored Instruction |
| 5.4 Discussion |
| 5.4.1 Discussion on the Effect of English Reading Scores |
| 5.4.2 Discussion on the Effect of English Reading Interest |
| 5.4.3 Discussion on the Effect of Interview |
| Chapter6 Conclusion |
| 6.1 Major Findings |
| 6.2 Implications |
| 6.3 Limitations |
| 6.4 Suggestions for Further Research |
| Bibliography |
| AppendixⅠ 学生英语阅读兴趣调査问卷 |
| AppendixⅡ Interview |
| AppendixⅢ Tests |
| Achievement |
| Acknowledgements |
（5）Research on Bearing Capacity and Stability of Slope Supporting Composite Structure with Framed Pre-Stressed Anchor Bar and Sheet Pile Wall（论文提纲范文）
| ABSTRACT |
| 摘要 |
| CHAPTER1 INTRODUCTION |
| 1.1 Research Background and Significance |
| 1.2 Review of Research Status |
| 1.2.1 Research Status of Slope Stability |
| 1.2.2 Study on Prestressed Anchor Bar and Sheet Pile Wall |
| 1.2.3 Research Status of Stability Using Finite Element Method |
| 1.3 Research Objectives,Contents and Key Problems to be Solved |
| 1.3.1 Research Objectives |
| 1.3.2 Research Contents |
| 1.3.3 Technical Route |
| CHAPTER2:STUDY ON BEARING CAPACITY AND STABILITY OF SLOPE SUPPORTING COMPOSITE STRUCTURE |
| 2.1 Introduction |
| 2.2 Classification and Composition of Prestressed Anchor Pile Sheet Wall |
| 2.2.1 Classification of Prestressed Anchor Pile Sheet Wall |
| 2.2.2 Composition of Prestressed Anchor Pile Sheet Wall |
| 2.2.3 Areas of use of Prestressed Anchor Pile Sheet Wall |
| 2.3 Mechanism of Prestressed Anchor Pile Sheet Wall |
| 2.3.1 Soil Pressure Theory of Pre-stressed Anchor Pile Sheet Wall |
| 2.3.2 Conventional Earth Pressure |
| 2.4 Basics of Slope Stability Analysis: |
| 2.4.1 Finite Element Method and Shear Strength Reduction Technique |
| 2.4.2 The Factor of Safety "FOS" and Strength Reduction Factor "SRF" |
| 2.5 Calculation Method of Internal Force of Prestressed Anchor |
| 2.5.1 Empirical Method |
| 2.5.2 Elastic Reaction Method |
| 2.6 Summary of This Chapter |
| CHAPTER 3:RESEARCH ON THE BEARING CAPACITY AND STABILITY OF FRAMED PRESTRESSED ANCHOR BAR AND SHEET PILE WALL |
| 3.1 Introduction |
| 3.2 Calculation Process Analysis |
| 3.2.1 Mohr-Coulomb Soil Model |
| 3.2.2 Non-Associated Plasticity |
| 3.3 Project Case Analysis |
| 3.3.1 Project Overview |
| 3.3.2 Finite Element Modeling and Calculation |
| 3.4 Calculation of Stability and Bearing Capacity by Finite Element Method |
| 3.4.1 Calculation of Stability by Finite Element Method |
| 3.4.2 Calculation of Bearing Capacity by Finite Element Method |
| 3.4.3 Calculation of Pile Lateral Displacement by Finite Element Method |
| 3.5 Conclusion |
| CHAPTER4:APPLICATION OF PLAXIS2D PROGRAMS IN THE STUDY OF THE STUDIED MODEL |
| 4.1 Introduction |
| 4.2 Software used PLAXIS2D |
| 4.3 Model Preparation Phase Within the PLAXIS2D Program |
| 4.4 Calculation Method of Soil Horizontal Resistance Coefficient |
| 4.4.1 Subgrade Coefficient Method |
| 4.4.2 Theoretical and Empirical Formula Method |
| 4.5 Calculation Process and Show Results |
| 4.5.1 Determination of Influencing Factors |
| 4.5.2 Analyzing the Calculation Results |
| 4.5.3 Checking the Calculation Results |
| 4.6 Summary of this Chapter |
| CHAPTER5 CONCLUSIONS AND EXPECTATIONS |
| 5.1 Conclusions |
| 5.2 Expectations |
| REFERENCES |
| ACKNOWLEDGEMENTS |
| Appendix academic papers published during the degree study |
（6）煤矿巷道预应力锚杆时效支护理论研究（论文提纲范文）
| 致谢 |
| 摘要 |
| abstract |
| 变量注释表 |
| 1 绪论 |
| 1.1 选题意义 |
| 1.2 国内外研究现状 |
| 1.3 主要研究内容与技术路线 |
| 2 时效围岩的内涵与模型构建 |
| 2.1 时效围岩的内涵 |
| 2.2 时效围岩机制探究 |
| 2.3 时效围岩的衡量方法 |
| 2.4 时效围岩模型建立 |
| 2.5 时效围岩模型参数分析 |
| 2.6 时效围岩承载曲线的简化算法 |
| 2.7 本章小结 |
| 3 预应力锚杆时效围岩支护机理 |
| 3.1 预应力锚杆支护与时效围岩的联系 |
| 3.2 预应力锚杆的计算模型和关键指标 |
| 3.3 预应力锚杆脱粘失效数值分析 |
| 3.4 锚杆托盘的变形应力演化规律 |
| 3.5 时效锚杆的计算方法 |
| 3.6 本章小结 |
| 4 时效围岩超级锚杆支护机理研究 |
| 4.1 超级锚杆支护的内涵 |
| 4.2 超级支护与时效支护的关系 |
| 4.3 时效围岩超级支护试验研究 |
| 4.4 时效围岩超级支护理论分析 |
| 4.5 超级预应力锚杆支护机理分析 |
| 4.6 煤矿超级锚杆结构设计与分析 |
| 4.7 本章小结 |
| 5 时效围岩模型软件开发与应用 |
| 5.1 时效围岩软件与理论模型评价 |
| 5.2 时效围岩软件在孤岛工作面的应用 |
| 5.3 时效围岩软件在软岩巷道中的应用 |
| 5.4 本章小结 |
| 6 结论与展望 |
| 6.1 主要结论与成果 |
| 6.2 主要创新点 |
| 6.3 存在的问题及展望 |
| 参考文献 |
（7）通货膨胀目标制对撒哈拉以南非洲货币政策的影响：综合控制方法（论文提纲范文）
| Abstract |
| CHAPTER ONE INTRODUCTION |
| 1.1 Background of the Study |
| 1.2 Statement of the Problem |
| 1.3 Objectives of the Study |
| 1.4 Research Questions |
| 1.5 Significance of the Study |
| 1.6 Scope and Limitations of the Study |
| 1.7 Organization of the Study |
| CHAPTER TWO LITERATURE REVIEW |
| 2.1 Concepts of Monetary Policy and Inflation Targeting |
| 2.2 Theoretical Literature Review |
| 2.3 Inflation Targeting Policy Framework |
| 2.4 Interest Rate as the Policy Instrument |
| 2.5 Empirical Review |
| CHAPTER THREE THEORETICAL FRAMEWORK |
| 3.1 Research Design |
| 3.2 Theoretical Framework to Approach |
| 3.3 Reasons for SCM Approach |
| CHAPTER FOUR RESEARCH METHODOLOGY |
| 4.1 Data Sources |
| 4.2 Sample Size |
| 4.3 Data Sampling Technique |
| 4.4 Synthetic Control Method |
| 4.5 Justification of the Analytical Approach |
| 4.6 Conceptual Framework |
| 4.7 Conclusion |
| CHAPTER FIVE RESULTS AND DISCUSSIONS |
| 5.1 Descriptive Statistics Analysis |
| 5.2 Trends of Inflation and GDP Growth Rates(1998-2018) |
| 5.3 Regression Analysis |
| 5.4 Synthetic Control Method(SCM)Results |
| 5.5 Interpreting the Size of Impact of IT by Conducting Placebo Test |
| CHAPTER SIX CONCLUSIONS AND RECOMMENDATIONS |
| 6.1 Conclusions |
| 6.2 Recommendations |
| REFERENCES |
| APPENDIX |
（8）多物理场电液静压机床主轴系统设计及振动响应因素优化研究（论文提纲范文）
| Abstract |
| 摘要 |
| CHAPTER 1:INTRODUCTION |
| 1.1 Introduction |
| 1.2 State of Research in China and Broad |
| 1.2.1 Spindles Bearing System Development |
| 1.2.1.1 Hydrostatic Spindle Development |
| 1.2.1.2 Hydrostatic Bearings Development |
| 1.2.1.3 Thermal Analysis of Motorized Spindle |
| 1.2.2 An Integrated Multiphysics Field Analysis |
| 1.2.3 Design Optimization of Spindle Bearing System |
| 1.3 The Theoretical and Practical Significance of Research |
| 1.3.1 The Research Objective |
| 1.3.2 The Research Methods |
| 1.3.3 Thesis Organization |
| CHAPTER 2: ANALYSIS OF RECESSED HYDROSTATIC JOURNAL BEARING |
| 2.1 Outline |
| 2.2 Hydrostatic Bearings |
| 2.2.1 Oil Pads |
| 2.2.2 Basic Theory of Hydrostatic Flow |
| 2.2.2.1 Newton's law of viscosity |
| 2.2.2.2 Viscous Flow between Parallel Plates |
| 2.3 Mathematical model of Hydrostatic Journal Bearings |
| 2.3.1 Eccentricity Ratio |
| 2.3.2 Journal Bearing Solution for Pressure, Load and Stiffness |
| 2.3.2.1 Journal Bearing Solution for Supply Pressure |
| 2.3.2.2 Journal Bearing Solution for Load Carrying Capacity |
| 2.3.2.3 Bearing Film Stiffness |
| 2.3.3 Power, Power Ratio and Temperature rise |
| 2.3.3.1 Pumping power |
| 2.3.3.2 Friction Power |
| 2.3.3.3 Power Ratio |
| 2.3.3.4 Temperature Rise |
| 2.4 Optimal Bearing Shapes and Tolerance |
| 2.5 Analytical Solution for Load, Stiffness and Power |
| 2.5.1 Solution Procedures |
| 2.5.2 Solution Results |
| 2.6 Summary |
| CHAPTER 3: AN INTEGRATED THERMOMECHANICAL MODEL FOR OPTIMIZINGHYDROSTATIC SPINDLE |
| 3.1 Outline |
| 3.2 RotorDynamics Model |
| 3.2.1 Computer Model for RotorDynamics Analysis |
| 3.2.2 The Finite Element Method in RotorDynamics Analysis |
| 3.2.3 Rotating Disk Dynamics Model |
| 3.2.4 Hydrostatic Bearing Dynamic Model |
| 3.2.5 Global Finite Element RotorDynamics Model |
| 3.3 Thermal Loss Models of Motorized Spindle |
| 3.3.1 Thermal Loss Model of Hydrostatic Bearing |
| 3.3.2 Thermal loss Model of Stator-rotor of Motor |
| 3.3.3 Heat Transfer Models |
| 3.3.3.1 The Energy Equation |
| 3.3.3.2 Thermo-Mechanical models |
| 3.3.4 Integrated Thermal and RotorDynamics Models |
| 3.4 RotorDynamics Analysis |
| 3.4.1 Unforced RotorDynamics Analysis |
| 3.4.2 Forced RotorDynamics Analysis |
| 3.5 Design Optimization |
| 3.5.1 Parametric Optimization |
| 3.5.2 Quality Loss Cost |
| 3.6 Summary |
| CHAPTER 4: A MULTIPHYSICS-FIEDS-BASED DESIGN ANALYSIS AND ITSVERIFICATION |
| 4.1 Outline |
| 4.2 Hydrostatic bearing Analysis |
| 4.2.1 Numerical Analysis |
| 4.2.2 Numerical Analysis Results |
| 4.3 Stator-Rotor of Motor thermal Analysis |
| 4.3.1 Motor Description |
| 4.3.2 Steady-State Thermal Analysis Results |
| 4.4 Integrated Thermal and RotorDynamics Analysis |
| 4.4.1 FEM Problem Descriptions and Boundary Conditions |
| 4.4.2 The effect of Body-Temperature stress on Static RotorDynamics |
| 4.5 The Effect of Thermal-induced-prestress on RotorDynamics |
| 4.5.1 Unforced RotorDynamics Analysis Results |
| 4.5.2 Forced RotorDynamics Analysis Results |
| 4.5.2.1 Forced RotorDynamics under Unbalanced Force Effect |
| 4.5.2.2 Forced RotorDynamics under Thermal-induced-Prestress Effect |
| 4.6 Verification of FEM Problem in ANSYS Analysis |
| 4.6.1 Similarity Design Method |
| 4.6.2 FEM Problem Solution Using Matlab |
| 4.6.3 The DH-VTC Vibration Test |
| 4.6.3.1 The DH-VTC Components and Control System |
| 4.6.3.2 The DH-VTC Experimental Measurements |
| 4.7 Summary |
| CHAPTER 5: DESIGN OPTIMIZATION METHOD |
| 5.1 Outline |
| 5.2 Parametric Optimization |
| 5.2.1 Design of Experiment |
| 5.2.2 Response Surface Model |
| 5.2.2.1 Effect of Design Factors on Output Response |
| 5.2.2.2 Sensitivities Analysis |
| 5.2.3 The Optimum FEM Model |
| 5.2.3.1 Quality Loss Function and Signal to Noise Ratio |
| 5.2.3.2 Verification of the Response-Surface Model |
| 5.3 Summary |
| CHAPTER 6: CONCLUSIONS |
| 6.1 Conclusions |
| 6.2 Outlook for Future Work |
| References |
| Appendix A: Calculations Data for Hydrostatic Bearings |
| Appendix B: The transient thermal FEM Derivation |
| Appendix C: General MATLAB Code for FEM Analysis |
| Publications |
| Acknowledgements |
| Resume |
| 东北林业大学博士学位论文修改情况确认表 |
（9）既有锚索边坡的预应力损失规律及对长期稳定性的影响（论文提纲范文）
| 摘要 |
| Abstract |
| 1 绪论 |
| 1.1 研究背景与意义 |
| 1.1.1 研究背景 |
| 1.1.2 预应力锚索松弛效应的研究意义 |
| 1.2 国内外研究现状 |
| 1.2.1 预应力锚索松弛效应理论模型研究 |
| 1.2.2 预应力锚索松弛效应的数值仿真模拟研究 |
| 1.2.3 预应力锚索现场试验和长期监测研究 |
| 1.3 本文的主要研究内容 |
| 2 锚索预应力损失机制与影响因素分析 |
| 2.1 预应力锚索锚固理论 |
| 2.1.1 拉力型锚索结构 |
| 2.1.2 锚固段附加应力场分析 |
| 2.1.3 预应力锚索的群锚效应 |
| 2.2 预应力损失影响因素分析 |
| 2.2.1 概述 |
| 2.2.2 锚索预应力短期损失机制及影响因素分析 |
| 2.2.3 锚索预应力长期损失机制及影响因素分析 |
| 3 灌浆体时效损伤效应影响下的预应力损失规律与边坡稳定性 |
| 3.1 预应力锚索边坡的数值建模 |
| 3.1.1 FLAC~(3D)数学原理 |
| 3.1.2 灌浆体损伤效应在锚单元中的数值实现 |
| 3.2 计算参数的选取 |
| 3.3 灌浆体损伤影响下的预应力松弛规律 |
| 3.3.1 注浆体粘结力时效损伤 |
| 3.3.2 粘结强度和切向刚度的耦合时效损伤 |
| 3.4 灌浆体损伤对边坡位移应力应变场影响 |
| 3.5 灌浆体损伤对边坡长期稳定性影响 |
| 4 岩体长期蠕变影响下的预应力松弛规律及边坡稳定性 |
| 4.1 预应力锚索边坡蠕变的数值模拟 |
| 4.1.1 岩体蠕变模型的数值实现 |
| 4.1.2 计算参数的选取与模拟结果分析 |
| 4.2 岩体蠕变效应影响下的预应力松弛规律 |
| 4.3 岩体蠕变效应对边坡位移应力应变场影响 |
| 4.4 岩体蠕变效应对边坡长期稳定性影响 |
| 5 结论 |
| 参考文献 |
| 致谢 |
| 作者简介及读研期间主要科研成果 |
（10）全长锚固锚杆剪应力分布研究（论文提纲范文）
| 摘要 |
| Abstract |
| Chapter 1 Studies on Shear Stress Distribution of Fully Grouted Rock Bolt |
| 1.1 Introduction |
| 1.2 Purpose of Thesis |
| 1.3 Background |
| 1.4 Literature Review |
| Chapter 2 Rock Bolt |
| 2.1 Purpose of Rock Bolt |
| 2.2 Background |
| 2.3 Breeds of Gully Grouted Rock Bolts |
| 2.3.1 Resin Grouted Rock Bolts |
| 2.3.2 Fully cement Grouted Rock Bolts |
| 2.4 W/C ratio for fully grouted bolt |
| 2.5 Stresses in Rock Mass |
| 2.5.1 Induced Stresses |
| 2.6 Stability Problems Caused by Rock Masses |
| 2.6.1 Stresses in Depths |
| 2.6.2 In Hard Rock |
| 2.6.3 In Week Rock |
| 2.7 Bolts Used as Support in Rock Stresses |
| 2.8 Design of Bolting System |
| 2.9 Bolt Length |
| 2.10 Anchor Capacity, Pattern and Spacing |
| Chapter 3 Pull Out Test Performed on Rebar Bolts |
| 3.1 Overview |
| 3.2 Main Features of Pre-Stressed Oil Pump |
| 3.3 Main Features of Pre-Stressed Hydraulic Jack Machine |
| 3.4 Preparation of Rebar |
| 3.4.1 Overview |
| 3.4.2 Existing Methods of Mounting Strain Gauges on Rebar |
| 3.4.3 Reliability of Test Data |
| 3.4.4 Impact of Loss of Cross-Sectional Area of Instrumented Bars |
| 3.5 Adopted Methodology of Mounting Strain Gauges |
| 3.5.1 Removed Surface Area |
| 3.5.2 Mounting strain gauges on rebar |
| 3.6 Pattern of strain gauges |
| 3.7 Preparation of Water and Cement Mixture |
| 3.7.1 Grouting Specimen |
| 3.7.2 Calculation of water and cement weight |
| 3.8 Placing Rebar in Grouted Specimen |
| 3.9 Pull Out Test Methodology |
| 3.10 Wheat stone Bridge Circuit |
| 3.11 Results of Pull Out Test |
| 3.11.1 For Plain Rock Bolt |
| 3.11.2 For Ribbed Rock Bolt |
| Chapter 4 Simulation of Pull Out Test by Abaqus Software |
| 4.1 Limitation of Laboratory Pull Out Test |
| 4.2 Plan of Simulation |
| 4.3 Methodology |
| 4.4 Graphical Results of Pull Out Test Performed on Abaqus |
| 4.4.1 Analysis of Results |
| 4.4.2 For 25mm Diameter of Rebar |
| 4.4.3 For 20mm Diameter of rebar |
| 4.4.4 For 16mm Diameter |
| 4.4.5 12.5 Diameter |
| 4.5 Simulation of Laboratory Experiments |
| Chapter 5 Conclusions |
| 5.1 Conclusions |
| 5.2 Suggestions for Future Work |
| References |
| Papers published |
| Acknowledgements |
| About Author |
四、Behavior of pre-stress group anchors——Theory approach and model（论文参考文献）
- [1]摩洛哥货币政策实现通货膨胀应对的有效性研究[D]. ERRAITEB MERYEM. 山东大学, 2021(11)
- [2]降雨入渗触发非饱和煤矸石堆积边坡失稳的机理研究[D]. Kaleem Ullah Jan Khan. 吉林大学, 2021(01)
- [3]中国学生在线英语写作同伴互评学习投入历时性研究[D]. 解冰. 东北师范大学, 2021(09)
- [4]抛锚式教学模式在大学英语阅读教学中的实证研究[D]. 叶培枫. 西北民族大学, 2021(09)
- [5]Research on Bearing Capacity and Stability of Slope Supporting Composite Structure with Framed Pre-Stressed Anchor Bar and Sheet Pile Wall[D]. Amna Saeed Mohammed Awadh. 兰州理工大学, 2021(01)
- [6]煤矿巷道预应力锚杆时效支护理论研究[D]. 曹俊才. 中国矿业大学, 2020
- [7]通货膨胀目标制对撒哈拉以南非洲货币政策的影响：综合控制方法[D]. Divine Setsofia. 浙江科技学院, 2020(04)
- [8]多物理场电液静压机床主轴系统设计及振动响应因素优化研究[D]. ELHAJ ABAKER IBRAHIM AHMED. 东北林业大学, 2020(09)
- [9]既有锚索边坡的预应力损失规律及对长期稳定性的影响[D]. 刘远洋. 安徽理工大学, 2020(04)
- [10]全长锚固锚杆剪应力分布研究[D]. Tahir Khan. 华北电力大学(北京), 2020(06)