The Application of Formative Assessment in Interactive Comprehensive English Classroom Teaching

Teaching evaluation is an important part of the teaching process of college English courses,and effective formative assessment can reflect the entire teaching process from multiple perspectives and ensure the smooth achievement of teaching objectives.Formative assessment is an assessment that runs through the entire learning process,based on humanism and constructivism,with various forms of evaluation.

基于Normal Form方法的UPFC多个功能控制器间交互影响分析

统一潮流控制器(UPFC)的重要特点之一就是它具有的多控制功能,包括潮流控制、电压控制和稳定性控制等等。然而时域仿真研究表明统一潮流控制器的多个控制器之间可能存在着较强的交互影响。本文研究了规范型(Normal Form)方法用于分析UPFC控制器间的交互影响问题的可能性,并引入一非线性交互指标定量地指示出控制器间的交互强弱程度。所提方法应用到新英格兰10机39节点系统,并通过时域仿真验证了所提规范型理论分析方法的有效性。

Interactive mechanism and friction modelling of transient tribological phenomena in metal forming processes: A review

The accurate representation of tribological boundary conditions at the tool–workpiece interface is crucial for analysis and optimization of formability,material flow,and surface quality of components during metal forming processes.It has been found that these tribological conditions vary spatially and historically with process parameters and contact conditions.These time-dependent tribological behaviours are also known as transient tribological phenomena,which are widely observed during forming processes and many other manufacturing application scenarios.However,constant friction values are usually assigned to represent complex and dynamic interfacial conditions,which would introduce deviations in the relevant predictions.In this paper,transient tribological phenomena and the contemporary understanding of the interaction between friction and wear are reviewed,and it has been found that these phenomena are induced by the transitions of friction mechanisms and highly dependent on complex loading conditions at the interface.Friction modelling techniques for transient behaviours for metal forming applications are also reviewed.To accurately describe the evolutionary friction values and corresponding wear during forming,the advanced interactive friction modelling has been established for different application scenarios,including lubricated condition,dry sliding condition(metal-on-metal contact),and coated system.

Roles of soil-structure interaction and damping in base-isolated structures built on numerous soil layers overlying a half-space

This study examines the roles of soil-structure interaction （SSI）, higher modes, and damping in a base-isolated structure built on multiple layers of soil overlying a half space. Closed-form solutions for the entire system, including a superstructure, seismic isolator, and numerous soil layers overlying a half-space, were obtained. The formulations obtained in this study simply in terms of well-known frequencies and mechanical impedance ratios can explicitly interpret the dynamic behavior of a base-isolated structure interacting with multiple soil layers overlying a half-space. The key factors influencing the performance of the isolation system are the damping ratio of the isolator and the ratio of the natural frequency of the fixed-base structure to that of the isolated structure by assuming that the superstructure moves as a rigid body. This study reveals that higher damping in the base isolator is unfavorable to higher mode responses that usually dominate the responses of the superstructure and that the damping mechanism plays an important role in transmitting energy in addition to absorbing energy. It is also concluded that it is possible to design a soft soil layer as an isolation system for isolating vibration energy.

Abundant Lump Solutions and Interaction Phenomena to the Kadomtsev-Petviashvili-Benjamin-Bona-Mahony Equation

In this paper, we obtained a kind of lump solutions of the Kadomtsev-Petviashvili-Benjamin-Bona-Mahony (KP-BBM) equation with the assistance of Mathematica. Some contour plots with different determinant values are sequentially made to show that the corresponding lump solutions tend to zero when x2+y2→∞. Particularly, lump solutions with specific values of the include parameters are plotted, as illustrative examples. Finally, a combination of stripe soliton and lump soliton is discussed to the KP-BBM equation, in which such a solution presents two different interesting phenomena: lump-kink and lump-soliton. Simultaneously, breather rational soliton solutions are displayed.

Lump and interaction solutions to the (3+1)-dimensional Burgers equation

The(3+1)-dimensional Burgers equation, which describes nonlinear waves in turbulence and the interface dynamics,is considered. Two types of semi-rational solutions, namely, the lump–kink solution and the lump–two kinks solution, are constructed from the quadratic function ansatz. Some interesting features of interactions between lumps and other solitons are revealed analytically and shown graphically, such as fusion and fission processes.

Thermodynamic Modelling of Ore-Forming Mechanism of the Changkeng Gold-Silver Deposits in Guangdong Province

The Changkeng gold-silver deposits consist of a sediment-hosted, disseminated gold deposit and a replacement-type silver deposit. The mineralizations of gold and silver are zoned and closely related to the silicification of carbonate and clastic rocks, so that siliceous ores dominate in the deposit. The mineralizing temperature ranges mainly from 300 to 170℃, and K+, Na+, Ca2+, Mg2+, and Cl- are the major ions in the ore-forming fluid. Calculations of distribution of metal complexes show that gold is mainly transported by hydrosulphide complexes, but chloride complexes of silver, iron, lead, and zinc, which are transformed into hydroxyl and hydrosulphide complexes under neutral to weak-alkaline circumstances in the late stage, predominate in the ore-forming solutions. Water-rock interaction is confirmed to be the effective mechanism for the formation of silver ores by computer modelling of reaction of hydrothermal solution with carbonate rocks. The solubility analyses demonstrate that the precipitation of gold and silver-bearing minerals taking place under weak-acid conditions and near-neutral to weak-alkaline conditions, respectively, is the main or favourable factor for the ore zonation and separation between gold and silver.

Soil-structure interaction on shallow rigid circular foundation:plane SH waves from far-field earthquakes

A closed-form wave function analytic solution of two-dimensional scattering and diffraction of incident plane SH-waves by a fl exible wall on a rigid shallow circular foundation embedded in an elastic half-space is presented. This research generalizes the previous solution by Trifunac in 1972, which tackled only the semi-circular foundation, to arbitrary shallow circular-arc foundation cases, and is thus comparatively more realistic. Ground surface displacement spectra at higher frequencies are also obtained. As an analytical series solution, the accuracy and error analysis of the numerical results are also discussed. It was observed from the results that the rise-to-span ratio of the foundation profi le, frequency of incident waves, and mass ratios of different media(foundation-structure-soil) are the three primary factors that may affect the surface ground motion amplitudes near the structure.

Diversity of Interaction Solutions to the (2 + 1)-Dimensional Sawada-Kotera Equation

In this paper, based on Hirota bilinear form, we aim to show the diversity of interaction solutions to the (2 + 1)-dimensional Sawada-Kotera (SK) equation. By introducing an arbitrary differentiable function in assumption form, we can obtain abundant interaction solutions which can provide the possibility for exploring the interactions between lump waves and other kinds of waves. By choosing some particular functions and values of the involved parameters, we give four illustrative examples of the resulting solutions, and explore some novel interaction behaviors in (2 + 1)-dimensional SK equation.

Creative Interaction in an Actional Approach on Second Language Acquisition

In the acquisition of a second language, the learner feels motivated to create verbal exchanges in order to build relationships with his/her partners but especially xo grow discursive and formative skills at the same time. Under this aspect, we＇re going to investigate, firstly, what the role of creativity is in interactions in the language class. On the other hand, the adoption of creative interaction techniques allows the group to take a new look in the face of its learning （apprenticeship）, to better manage its potential. Finally, it would be interesting to propose the realization of a project of creative communication, to re-explore creativity in problem solving through the techniques of the game, giving more importance to the performance of more or less complex tasks and the development of the project in a holistic and action-oriented approach.

Using Social Interaction to Invert the Professional Competencies of Future Architects

The article analyzes the results of a sociological study of the role of public and interdisciplinary communications for formation and inversion of architect’s competences.The study was carried out in 2021-2022 among students of architecture departments in Russia.About 3,000 students of the Moscow Architectural Institute(State Academy)and the Orel State University took part in the study.As a result of processing the data of the written questionnaire with correlation relationships,the potential of“external”educational communications was identified for acquisition of new professional knowledge and competencies in architecture;popularization of socially important ideas in architecture and spatial development;raising a sense of pride and respect for urban historical and cultural heritage;enhancing the prestige of the architectural profession and the status of architectural education;understanding social expectations of architectural activities and factors limiting implementation of projects;identifying factors influencing formation of strategies for the development of architectural education.Four stages of formation and inversion of professional competences in the educational process were singled out:1st-2nd years of training-an“orientation period”;3rd-4th years-the level of Bachelor of Science in Architecture,at which the groundwork of the professional thinking basics is laid-a stage of mastering the basic system-design skills;5th year(diploma thesis)-a stage of entry into creative practice;training at the level of Master of Science in Architecture-scientific-design practice in architecture.Issues concerning underrating the importance of future architects’involvement in joint activities with community and engineering professions representatives to realize the goals of sustainable development were identified;late awareness of the value of participation in volunteer programs.

Recovery of Tungsten Surface with Fiber-Form Nanostructure by Plasmas Exposures

One of the serious concerns for tungsten materials in fusion devices is the radiation defects caused by helium plasma irradiation since helium is a fusion product. The fiber-formed nanostructure is thought to have a possible weakness against the plasma heat flux on the plasma- facing component and also may destroy the reflectivity of optical mirrors. In this paper an inter- esting method for the recovery of such tungsten surfaces is shown. The recovery process depends on the grade and manufacturing process of tungsten materials.

Theoretical Modelling of Water-Rock δD-δ^(18)OIsotopic Exchange System and Source of Ore-Forming Fluid:A Case Study on Jinduicheng Superlarge-Scale Molybdenum Deposit,Central China

Based on the theoretical modelling of water-rock δD-δ18O isotopic exchange process,the evolution and sources of ore-forming fluid in four metallogenic epochs of the Jinduicheng su-perlarge-scale porphyry-type molybdenum deposit were investigated. It was revealed that in thepre-metallogenic and early-metallogenic epehs, the ore-forming fluid was a residual fluid derived from magmatic water-wall rock interaction at middle to high temperatures (T = 250 -500℃) and lower W/R ratios (0. 1 > = W/R >0.001 ), while in the metallogenic and Post-metallogenic epochs, the ore-forming nuid was a residual fluid derived from meteoric water-wallrock interaction at midd1e to lower temperatures (T = 150 - 310℃ ) and relatively high W/Rratios (0. 5 >W/R≥0.1 ). The meteoric water played an important role in molybdenum min-eralization, and at the main metallogenic epoch the W/R ratio reached its maximum value.

A Brief Study on Peer-peer Interaction

Peer-peer interaction offers multiple benefits to learners and holds great implications for language learning. Peer-peer interaction creates a communication-friendly environment where novice foreign language learners feel more comfortable to use the target language, reinforcing what they have learned and pushing them to rack their brains and reach beyond the zone of proximal development for more.

基于改进虚拟同步发电机控制的功率交互振荡抑制策略

在指令功率发生扰动时,虚拟同步发电机控制环路易产生功率交互振荡,威胁系统的安全稳定运行。为此,提出一种基于改进虚拟同步发电机控制的功率交互振荡抑制策略。基于相对增益矩阵原理研究不同系统参数变化时虚拟同步发电机输出功率间交互作用的变化规律;采用转速阻尼功率高通反馈改进虚拟同步发电机有功功率-频率控制环路,并通过绘制Bode图对比传统虚拟同步发电机控制策略与改进虚拟同步发电机控制策略的暂态和稳态性能;利用相对增益矩阵原理分析改进虚拟同步发电机控制策略的有功功率环路交互作用情况。仿真及实验结果表明,所提策略可有效实现虚拟同步发电机交互振荡的抑制。

铝合金板阵列微结构零件电磁冲击液压成形研究

目的解决室温条件下因铝合金塑性流动不均而导致的零件开裂和尺寸偏差等问题。方法利用高速冲击提高材料成形极限以及流体均匀载荷精确控形的优势,提出了电磁冲击液压工艺并实现了铝合金阵列结构零件的成形,采用实验手段研究了放电电压和放电次数对零件贴模精度和厚度分布的影响。结果随着放电电压的增大,零件的成形深度增大。在单次放电8kV下,板料最大成形深度达到模具深度的97%,连续3次放电8kV后,零件通道填充率达到89.7%。建立了与物理实验模型一致的电磁-流体-结构的多物理场耦合仿真模型,发现冲击液体对板料施加的瞬态压强超过200MPa,板料最大变形速度达到40.5m/s。模拟得到的板料变形轮廓与实验结果一致,证明了多物理场耦合仿真模型的准确性。结论电磁冲击液压成形是一种新型的高速成形方法,能够实现铝合金阵列微结构零件的精确制造,为提高复杂薄壁难变形构件的成形性能和精度提供了新的技术手段。

跟网型和构网型变流器动态交互特性分析

构网型和跟网型变流器2种控制模式具有显著差异,互联场景下系统的稳定机理尚未得到有效揭示。为此,分析了2种变流器内部控制回路的交互机理,旨在揭示互联系统的动态特性。首先,分析了变流器内部控制回路和外部阻抗特性的关系,将整体阻抗分解为环路的等效子阻抗。然后,通过灵敏度分析,定位了不同场景下影响系统稳定性的关键控制回路。基于主导回路分析,研究了关键控制回路间的交互机理。最后,通过时域仿真验证了结果的准确性。

基于交互体验下农特产品包装形态设计应用

从消费者交互体验设计的角度出发,提出农特产品包装交互体验设计策略,使其既能实现包装基础功能又能满足消费者交互体验和情感价值。剖析农特产品包装发展现状及改进方向,挖掘交互体验在农特产品果干类包装形态的设计新思路,有效搭建消费者、包装形态、农特产品三者之间交互关系桥梁,基于三层次理论角度出发,关注消费者交互体验和心理需求,通过本能层触发多感官交互、行为层引导行为交互、反思层营造情感体验的方式,探索农特产品包装更多可能性。实现农特产品包装转型升级,满足消费者的交互体验和情感价值,为农特产品包装设计创新提供参考依据。

计及控制延迟和电网阻抗变化的并网微网内压控逆变器的被动增强控制

随着对环境问题的日益关注,越来越多以微电网为代表的分布式能源系统出现在电力系统中,这给传统电力系统带来挑战。如数字控制系统中的延迟、弱电网中的电网阻抗变化及微电网中并联变换器之间的相互作用等会对微电网稳定运行造成不利影响。基于此,提出1种计及控制延迟和电网阻抗变化的新型微电网形成控制方法,以提升微电网应对不确定性的稳定性。该方法首先对上述问题进行建模,并提出1种延迟补偿方法,提升控制系统对电网阻抗变化的鲁棒性;然后,在控制系统中引入前馈回路,使控制系统免受微电网中并联逆变器的干扰;最后,实验结果验证了所提控制方法的有效性与优越性。

水下悬浮隧道的技术现状和未来展望

阐述了水下悬浮隧道(又称水下悬浮管桥)的概念;探讨了悬浮隧道结构的4种支撑形式,即岸锚式、桥墩支撑式、浮筒固定式和锚索固定式,并对4种支撑形式的适用性进行了对比;对悬浮隧道的跨海形式及主隧道结构断面形式进行了讨论,分析了多管系统+横通道连通形式在火灾及事故发生时的安全性。介绍了国际上悬浮隧道的相关标准:国际结构混凝土联合会(fib)在2020年发布了《水下悬浮管桥(SFTB)设计指南》(fib公告第96号),旨在为技术界提供水下悬浮管桥方案设计指南;国际隧道和地下空间协会(ITA)在2023年发布了《水下悬浮隧道(SFT)业主指南》,旨在向基础设施业主说明,水下悬浮隧道相比传统隧道的适用性;另外,挪威国家标准已率先将悬浮隧道结构纳入国家桥梁手册(2020)。梳理了悬浮隧道已有的理论研究,介绍了目前水下悬浮隧道比较热门的研究课题,比如流体-结构相互作用和冲击等。分析了水下悬浮隧道的优势,不仅能够减小主要的海洋荷载对结构的影响,而且可以降低隧道和相连结构的坡度,缩短穿越距离,保护海底地形以及减少对周围区域的噪声影响。随着人们对环境问题的日益重视,以及新材料和新技术为减少气候影响带来的机遇,悬浮隧道有望获得进一步的推广。