Three-dimensional Computational Fluid Dynamics Modeling of Two-phase Flow in a Structured Packing Column

Characterizing the complex two-phase hydrodynamics in structured packed columns requires a power- ful modeling tool. The traditional two-dimensional model exhibits limitations when one attempts to model the de- tailed two-phase flow inside the columns. The present paper presents a three-dimensional computational fluid dy- namics （CFD） model to simulate the two-phase flow in a representative unit of the column. The unit consists of an CFD calculations on column packed with Flexipak 1Y were implemented within the volume of fluid （VOF） mathe- matical framework. The CFD model was validated by comparing the calculated thickness of liquid film with the available experimental data. Special attention was given to quantitative analysis of the effects of gravity on the hy- drodynamics. Fluctuations in the liquid mass flow rate and the calculated pressure drop loss were found to be quali- tatively in agreement with the experimental observations.

Creative Teaching + Creative Class = Creative Products + Additional Value—A Case Study of Course Reform of Three-dimension Structure

The teaching model of "creative Teaching + creative class = creative products + additional value" was proposed, so as to cultivate students' design creativity and practical ability by changing teaching concepts and curriculum of Three-dimension Structure, and using new materials for spatial creativity training. This paper acclaims that only if the traditional teaching concepts of Three-dimension Structrue are abandoned, students' specialty fully used, the teaching effect will be improved effectively.

Editorial: Special subject on the mechanical behavior of thermal protection materials and structures

The thermal protection materials and structures are widely used in hypersonic vehicles for the purpose of thermal insulation, and their mechanical behavior is one of the key issues in design and manufacture of hypersonic vehicles. It is our great pleasure to present the seven papers in this special subject of Theoretical ＆ Applied Mechanics Letters （TAML） and introduce the recent progresses on the mechanical behavior of thermal protection materials and structures by the authors.

Specialization or Diversification:Which is More Conducive to Foreign Trade Resilience?Evidence from China-Russia Border Regions in Northeast China

Under the background of complex international situation,how to build the special geo-economic space of China-Russia bor-der lies in strengthening their foreign trade resilience against external shocks.Based on empirical evidence from ten prefecture-level China-Russia border regions in Northeast China,this paper analyzed the spatiotemporal evolution of foreign trade resilience under dif-ferent shocks.Furthermore,through the Panel Regression model,the mechanism of the industrial structure on the foreign trade resili-ence in contraction period and expansion period was discussed.The results showed that:1)from 2004 to 2021,foreign trade in China-Russia border regions experienced five phases.The overall foreign trade resilience was higher than expected,showing a rising volatility trend,but there was significant spatial heterogeneity in the ability of cities to cope with shocks.2)Highly specialized clusters were mainly concentrated in Yichun,Heihe and Da Hinggan Ling Prefecture,while Mudanjiang and Yanbian performed better in related and unrelated diversification.3)In different stages of economic system evolution,the response mode,degree and result of border foreign trade resilience to regional industrial structure showed obvious stage characteristics.During the contraction period,related diversifica-tion was more conducive to improving the resistance through risk spillovers.During the expansion period,specialization played a more significant role in improving regional resilience through self-reinforcing effect.These results are beneficial for expanding the resilience theory,ensuring border economic security and optimizing border industrial investment layout.

Role of Ordering Energy in Formation of Grain Structure and Special Boundaries Spectrum in Ordered Alloys with L12 Superstructure

It was revealed that an average energy of special boundaries is proportional to APB energy in the alloys with the L12 superstructure. This fact proves the appearance of the GAPBs in the planes of location of special boundaries in coincidence sites of ordered alloys. It was determined that the more energy of special boundaries in ordered alloys, the more energy of complex stacking fault. There is a correlation between the distribution of special boundaries as a function its relative energy and ordering energy: the more ordering energy, the more degree of washed away of distribution. The correlation between average relative energy of special boundaries and ordering energy was detected: the more ordering energy, the more average energy of special boundaries. The reverse dependence between ordering energy and average number of special boundaries in grains limited by boundaries of general type was discovered.

Global Topological Structure of a Class of Plane Homogeneous Fifth System with Six Special Direction

In this paper, a class of plane homogeneous fifth system with six special direction is studied, and the global topological classification and coefficient conditions is discussed.

The Role of Special Economic Zones in Enhancing Enterprise’s Export Structures:The Perspective of Industry Complexity

Special economic zones(SEZs)help provide the momentum for China’s economic growth.This paper studies the influence of SEZs on enterprise’s export structures from the perspective of production complexity using data from the China Industry Business Performance Database(CIBPD)collected between 2000 and 2007.We found that enterprises in SEZs have a higher export propensity and volume due to more complexity.Also,enterprises with more complexity outside SEZs show a higher export propensity and volume depending on the number of SEZs near them and the radiation effect of the SEZs.Similarly,high and new-tech industrial development zones perform more prominently in this regard.

On Speciality Structure for Musical Education in Colleges

In general, the overall goals for musical education in colleges include but are not limited to, to make the students become talents with ability to adapt specialized requirements by state, capacity to perform with artistic doctrines, capability to solve problems in teaching and research, ability to adapt to reform in musical education at schools, and ability to promote music in society.Based on examination of history of musical education, and reference by contemporary authors, this paper intends to elaborate basic speciality structure for musical education students by approaches of analysis, deduction and induction and so on and so forth. The paper mainly focus on the necessity, importance, practical nature and relevance. Particular attention has been paid to model called ＂speciality plus versatility＂ based on advice from students, schools and society as well.

Analysis on Governance Structure of Farmers' Specialized Cooperatives in Sichuan Province

In this paper, 87 farmers' specialized cooperatives in Sichuan Province were investigated firstly, and then their governance structure was analyzed from the aspects of authority, decision-making mechanism, supervision mechanism and executive body based on the corporative governance structure in narrowest sense, finally corresponding policy suggestions for improving the governance structure of farmers' specialized cooperatives in Sichuan Province were put forward. It is concluded that human control is serious within farmers' specialized cooperatives; inner supervision is effective; council has great effects on governance structure; the cooperatives give limited incentive to managers.

Evaluation of Governance Structure of Farmers' Specialized Cooperatives

In this paper,from the authority,decision-making body,supervisory body and implementing body,we analyze the governance structure evaluation indicators of farmers' specialized cooperatives,using objective and subjective combination weighting approach.And we draw the following conclusions:the rate of return of profits for membership,frequency of council convened and the number of members of board of supervisors have a great impact on the governance structure of cooperatives; the insider control phenomenon in cooperatives is more serious and the level of incentives is limited.Finally we put forward corresponding policy recommendations.

Tekla Structures在异形钢结构中的应用

随着建筑技术发展与社会进步,钢结构建筑应用广泛,人们对建筑外形要求越来越高,建筑设计中逐渐出现非常规性钢结构。本文主要介绍目前在钢结构工程中应用最广泛的Tekla Structures软件,阐述其主要功能和优势,并具体分析该软件在深化设计异形钢结构中的应用方式。

Thermodynamically Revealing the Essence of Order and Disorder Structures in Layered Cathode Materials

Layered transition metal(TM) oxides are one of the most widely used cathode materials in lithium-ion batteries. The atomic configuration in TM layer of these materials is often known to be random when multiple TM elements co-exist in the layer(e.g. Ni, Co and Mn). By contrast, the configuration tends to be ordered if the elements are Li and Mn. Here, by using special quasi-random structures(SQS) algorithm, the essential reasons of the ordering in a promising Li-rich Mn-based cathode material Li2MnO3 are investigated. The difference of internal energy and entropy between ordered and disordered materials is calculated. As a result, based on the Gibbs free energy, it is found that Li2MnO3 should have an ordered structure in TM layer. In comparison, structures with Ni-Mn ratio of 2:1 are predicted to have a disordered TM layer, because the entropy terms have larger impact on the structural ordering than internal energy terms.

基于客观结构化临床考试的情景模拟式教学在手术室专科护士培训中的应用

目的探讨基于客观结构化临床考试(objective structured clinical examination,OSCE)的情景模拟式教学在手术室专科护士培训中的应用效果。方法选取参加郑州大学第一附属医院手术室专科护士培训的78名学员为研究对象。按照培训时间先后顺序,将2021年4月-6月参加培训的40名学员作为对照组,将2022年4月-6月参加培训的38名学员作为观察组。对照组采用常规情景模拟式教学,观察组采用基于OSCE的情景模拟式教学,比较2组操作考核成绩、临床思维能力。结果观察组操作考核中患者核查交接、手术体位安置、职业暴露防护的考核成绩均好于对照组(t=4.616,P<0.001;t=3.004,P=0.004;t=3.574,P=0.001),观察组临床思维能力得分高于对照组(t=7.309,P<0.001)。结论将基于OSCE的情景模拟式教学应用于手术室专科护士培训,有助于提高其操作技能和临床思维能力,值得临床推广应用。

城市更新专项规划编制的内容体系构成与关键技术路径

城市更新专项规划是当前各地推进城市更新行动的重要抓手和新兴工具,其编制方法和工作路径正处于探索阶段。辨析城市更新专项规划兴起的背景与需求,对比分析北京、深圳、广州、重庆等地的规划编制经验,总结市区层面城市更新专项规划编制的主要做法与内容构成,详细剖析以存量空间资源统筹为核心的“本底识别—分类梳理—管控引导”规划编制技术路径,从实施流程、传导机制、落地工具等方面提出保障城市更新专项规划效用发挥的措施建议。

要素禀赋改善、产业结构优化与特殊类型地区共同富裕

特殊类型地区是推进高质量发展的重点区域,建构“以要素禀赋改善为支撑,产业结构转型升级为引擎,协同驱动区域共同富裕”的逻辑框架,计量分析要素禀赋和产业结构耦合协调度,实证检验三者之间互动关联并探讨其理论蕴含,有益于加快构建支持特殊类型地区振兴发展的政策体系和长效机制。结果表明,产业结构调整在要素禀赋影响特殊类型地区振兴发展的过程中发挥中介作用;实现要素禀赋与产业结构的耦合协调可以更好推进区域共同富裕,二者耦合协调程度在要素禀赋促进区域共同富裕过程中发挥门槛效应;要素禀赋及其与产业结构耦合协调度发挥正向作用时,其滞后一期变量对促进区域共同富裕具有阻滞作用。据此针对要素品质提升、产业结构高阶演进以及政府与市场作用协同发挥等领域给出相关建议,力争推动特殊类型地区在要素禀赋改善与产业结构优化良性互动中实现高质量发展。

超高层异形爬架综合施工技术研究

杭州西站TOD项目超高层建筑外立面轮廓线先外扩再内收,为此采用了异形爬架,通过两阶段垂直爬升和内收俯爬进行作业。本研究介绍了异形爬架的主要特点,明确爬架断面分区、机位布置,分析解决爬升流程技术要点和难点。给出爬架附着支座在悬挑板上的计算校核;结合爬架外扩内收的结构变形,通过定型化防护网搭接解决扇形空隙防护区域,并设置防倾构造保障架体安全,可为同类工程施工提供参考。

铰接方钢管组合异形柱框架抗震性能研究

为解决村镇住宅体系存在的装配式程度及标准化程度较低、现场焊接工作繁多、室内建筑面积浪费等问题,提出了一种铰接方钢管组合异形柱框架体系。该体系中异形柱采用3根空钢管通过钢板与加劲肋组合而成的L形柱,梁柱节点为腹板螺栓连接的铰接节点。通过拟静力试验对该体系的抗震性能进行研究。研究结果表明:相比于铰接钢管混凝土组合异形柱,铰接空钢管组合异形柱框架体系先于梁端出现转角,最后破坏模式为柱脚破坏,具有更优良的抗震耗能和更缓慢的强度与刚度退化,并通过对比刚接节点和铰接节点的骨架曲线,发现节点刚接程度对结构整体的抗侧刚度影响较大。

基于NLP构建病历后结构化专病数据库探索与实践

目的/意义建设基于结构化电子病历的专病数据库,提高专病数据库规范性和可用性,提高临床科研工作效率。方法/过程采用模板化输入、自然语言处理等技术,将非结构化电子病历转化为结构化电子病历,基于结构化电子病历构建专病数据库。结果/结论龙华医院基于结构化电子病历建设的银屑病专病数据库分中心,为临床科研人员提供结构化科研数据源,辅助提升分析效率;同时有效支撑上海申康“基于多中心的银屑病专病大数据临床科研随访一体化平台”建设,有助于专病数据库高质量、规模化发展。

会计专业课程思政建设与实践研究

新形势下,与专业相结合的课程思政是高校落实立德树人根本任务的重要途径,是各方高度关注的理论和实践问题。目前尚缺乏对课程思政科学内涵、结合机理、逻辑结构的深刻揭示,理论基础薄弱,实践成效不佳。该文以会计专业课程思政建设为例,立足“技术性”“社会性”“政策性”等职业特征,结合数智时代对会计转型升级的素养要求,按明其理、知其然、行其道的思路,全面揭示会计专业课程思政建设的必要性、可行性、实践困境与逻辑结构,进一步提出具体方法与举措,为促进理论与实践的互动协同、推动会计专业课程思政全面建设与发展提供借鉴与参考。

窄翼缘异形柱-波纹钢板剪力墙体系的抗震性能

针对钢结构住宅凸梁、凸柱和抗侧刚度不足的问题,提出一种新型窄翼缘异形柱-波纹钢板剪力墙体系;通过与传统H形钢柱-平钢板剪力墙体系进行对比,确定内嵌波纹钢板布置方式,采用ABAQUS软件建立所提出体系的有限元模型,对所提出体系的抗震性能进行分析,探讨外部框架截面形式与布置方式、波纹钢板厚度与剪跨比等对所提出体系的抗侧承载力、耗能能力和塑性变形能力的影响。结果表明:所提出的体系具有较大的抗侧承载力和较强的耗能能力、塑性变形能力,极限抗侧承载力为设计值的1.73倍,具备一定的安全储备;横向布置的波纹钢板能有效减小其作用于框架梁柱的荷载;采用十字形异形柱使所提出的体系有更强的塑性变形能力;所提出体系中的异形柱偏肢宜沿剪力墙面内方向布置,内嵌波纹钢板厚度宜取为3~5 mm,剪跨比宜控制在1.25左右。