摘要：A series of quaternary ammonium ionic liquids(ILs)were synthesized and employed as catalysts for the production of poly(isosorbide carbonate)(PIC)from diphenyl carbonate and isosorbide via a melt polycondensation *** relationship between the anions of the ILs and the catalytic activities was investigated,and the readily‐prepared IL tetraethylammonium imidazolate(TEAI)was found to exhibit the highest catalytic *** optimizing the reaction conditions,a PIC with a weight‐average molecular weight(Mw)of25600g/mol was obtained,in conjunction with an isosorbide conversion of92%.As a means of modifying the molecular flexibility and thermal properties of the PIC,poly(aliphatic diol‐co‐isosorbide carbonate)s(PAIC)s were successfully synthesized,again using TEAI,and polymers with Mw values ranging from29000to112000g/mol were obtained.13C NMR analyses determined that the PAIC specimens had random microstructures,while differential scanning calorimetry demonstrated that each of the PAICs were amorphous and had glass transition temperatures ranging from50to115°*** analyses found Td‐5%values ranging from316to332°C for these *** on these data,it is evident that the incorporation of linear or cyclohexane‐based diol repeating units changed the thermal properties of the PIC.

摘要：《高分子化学》是材料、化工、环境等工科专业的骨干课程,对于具有科技创新能力的人才培养具有重要的作用。基于双碳目标发展战略,结合课程教学要求,从高分子合成单体、引发剂选用、高分子合成方法、合成机理特征、聚合物化学反应等教学重点内容出发,分析了双碳理念和课程内容的契合点以及融入途径。围绕具有高分子绿色合成思维与创新能力的双碳战略人才培养要求,从教学内容设计、双碳理念融入方式、教学方法选用等方面进行了设计与探索实践,并对教学实践效果进行了浅析。

摘要：Effective electrocatalysis is crucial for enhancing the efficiency of water splitting to obtain clean ***,we report a system of interesting and high-performance Sr-doped perovskite electrocatalysts with porous structures,obtained via a facile molten salt method and applied in the oxygen evolution reaction(OER).With increasing the Sr content,the valence states of Co and Fe ions do not clearly increase,according to the Co-L2,3 and Fe-L2,3 as well as the Co-K and the Fe-K X-ray absorption spectroscopy,whereas doped holes are clearly observed in the 0-K ***-resolution transmission electron microscopy indicates the appearance of an amorphous layer after the electrochemical *** conclude that the formation of the amorphous layer at the surface,induced by Sr doping,is crucial for achieving high OER activity,and we offer insights into the self-reconstruction of the OER catalyst.

摘要：页岩油的储层特性要求采用长水平段和大规模压裂技术,由此对井眼轨道设计提出了更高要求。文章针对传统三维轨道设计存在摩阻大、卡钻风险过高的问题,建立了“双二维”水平井轨道设计方案,包括上部三维增斜扭方位段与下部二维增斜,建立了入靶精度和最短井深作为双优化目标函数,采用深度学习方法进行求解。利用该模型对古龙页岩油进行轨道优化,结果表明采用深度学习的优化设计,在保持相同偏移距条件下总井深更小,表明该模型在实际应用中能够有效提高设计精度和施工效率。

摘要：A series of Co-imbedded zeolite-based catalysts were synthesized following a facile solvent-free grinding *** catalytic performance for direct syngas conversion to gasoline range hydrocarbons was compared with their counterpart Co-impregnated zeolite-based *** transformation of solid raw materials to targeted zeolite was confirmed by XRD,SEM,STEM,and N2 physisorption *** in-depth study of acidic strength and acidic site distribution was conducted by NH3-TPD and Py-IR *** strength showed a pivotal role in defining product ***@S1,with the weakest acidic strength of silicalite-1 among three types of zeolites,evaded over-cracking of product and exhibited the highest gasoline and isoparaffin selectivity(≈70%and 30.7%,respectively).Moreover,the solvent-free raw material grinding route for zeolite synthesis accompanies several advantages like the elimination of production of wastewater,high product yield within confined crystallization space,and elimination of safety concerns regarding high pressure due to the absence of the *** and easiness of the solvent-free synthesis route together with promising catalytic performance strongly support its application on the industrial scale.

摘要：为提升累计当量轴次换算的准确性,基于路面结构验算方程,依据等效损坏原则,通过ABAQUS模拟分析车辆设计速度变化与行驶特性对路面动态力学响应的影响,并基于力学响应差异提出了相应的轴载换算修正方法及修正系数。研究分析表明,基于车辙等效的轴载换算修正系数接近于1,基于拉应力等效的轴载换算修正系数随设计速度增加而降低,为确保路面结构可靠性,设计速度变化工况下的常规路面设计可不进行轴载换算修正;基于剪应力等效的轴载换算修正系数在车辆启动与制动工况下分别为1.166与1.802,且具有良好的普遍适用性,可为特定路段的沥青路面精细化设计提供实用参考。

摘要：为满足工艺专业对空间的要求,某单层四连跨抽柱钢结构厂房采用了钢托梁和大跨度箱型钢吊车梁方案。通过对较大跨度抽柱处的刚架设计介绍及大跨度吊车梁设计方案的选择,提出合理的结构设计方案,为类似工程提供参考。

摘要：论文结合工程实例,通过各种方案的对比及分析,对大厚度湿陷性黄土地基采用了挤密桩与灌注桩组合处理的方法,在满足部分消除湿陷性的设计要求同时提高了灌注桩的承载力,既节省地基处理的费用且方案可靠。论文论述了设计过程中设计方案的选取及设计过程中应注意的问题,为以后对类似工程具有参考和借鉴作用。

摘要：【目标】现有基于滑模变结构的区域边界控制算法存在明显缺陷,即系统状态需要在时间趋于无穷大时才能收敛到平衡点,仅能保证系统的渐进稳定。这显然无法满足现代城市交通管理对于快速响应和高效调控的需求。为克服该局限,提出一种基于宏观基本图和积分终端滑模的区域边界控制算法,获得较快的收敛速度以及较好的鲁棒性和扰动抑制特性。【方法】首先,将干扰(非门控或区域内部交通量)和宏观基本图建模中的不确定性视为集总干扰,建立城市过饱和区域边界控制系统模型。在此基础上,引入非线性积分终端滑动超平面,设计一种基于积分终端滑模的边界控制算法。【结果】将所提方法应用于5×5均匀棋盘路网中,路网累积空间交通流量有超过1%的提升,部分算例中接近5%;平均速度有超过5%的提升,部分算例中超过8%。所提出算法具有较快的收敛速度和较好的扰动抑制能力,能显著提升路网累计吞吐量和路网中车辆平均速度,缓解过饱和区域交通拥堵。【结论】相较于既有滑模变结构边界控制算法,所提出算法采用非线性积分终端滑动超平面,能保证受控路网状态在预设有限时间内收敛到期望状态;相较于既有比例积分控制策略,能更好处理受控路网中非常值干扰交通需求和宏观基本图建模中存在的低离散度。

摘要：线上教学模式研究是当前高等教育教学改革中的研究热点,然而目前线上教学目标和教学活动设计还存在教学不一致、较难适应线上教学等问题。在分析线上教学目标和教学活动内涵的基础上,梳理了线上教学环境下教学目标和教学活动设计存在的问题,提出了基于布鲁姆认知模型的线上教学目标和教学活动设计方法。这种方法能够贴合线上教学的特点设计教学目标和教学活动,有助于提高线上教学时学生的参与程度和学习效率,促进学生对知识点的理解和吸收,为线上教学目标和教学活动设计提供了参考。