指向核心素养的高中数学“生”动教学设计

高中数学教学以培育学生的核心素养为目标,以学生为主体,关注学生的思维活动,构建“生”动教学.教师可从“情境与问题”“知识与技能”“思维与表达”“交流与反思”等四个方面启发学生“动”起来,发展学生的数学学科核心素养.

高中政治活动型学科课程视域下“生”动课堂的构建策略

随着新课程改的稳步推进,高中政治课已经成为一门活动型学科课程。在此背景下,“生”动课堂的构建能够充分体现活动这一特征,同时也能凸显学生的主体地位,提高学生学习的积极性和主动性,进一步促进学生思辨能力和学习能力的提升,提高运用政治知识解决现实问题的能力,从而实现学科的育人价值,落实立德树人的根本任务。

借助“生”动探究 落实数学育人——“不同函数增长的差异”教学实践与思考

文章以2019年人教A版必修第一册“不同函数增长的差异”这节课为例,以发展数学学科核心素养为导向,以学生为主体,开展“生”动教学,关注学生数学活动的方式,促进学生自主探究,落实数学教学的育人价值.

“生”动的课堂才是高效的课堂——“平面向量的几何意义及应用”复习课简录及思考

课堂是师生对话、交流的平台，在“生疑、质疑、释疑”中拓展认知结构，深化认知水平．营造民主的课堂氛围，鼓励“生”动；设计梯度合适的问题，激活“生”动；顺学生自然思维，给“生”动以空间；适时引导反思，让“生”动更加深刻，让学生动起来的课堂才是高效课堂．

建构“生”动课堂，发展学生政治学科素养

新课改的深入开展,要求学科教学要不断提高学生的学科素养,而建构"生"动课堂是落实发展学生政治学科素养的重要载体。学生要"心"动、"口"动、"思"动、"情"动,更要"行"动。为此,教师要创设鲜活的情境,设计思辨性的问题,引导学生参与"议、展、评"活动,让学生在活动体验中、在拓展性任务中获得知识,提高能力,形成政治学科素养。

构建“生”动教学 促进概念生成--以“数列的概念”教学为例

概念教学在高中数学教学中占有重要地位,以学生为主体的教学,应鼓励学生“动”起来,激发学生学习的热情,积极参与数学活动.文章以“数列的概念”教学为例,谈谈“生”动教学的实践与思考.

“生”动解题数学育人——从一道课后习题谈起

对数比大小问题,题目简短,方法灵活多样,但解题中涉及到的知识面广,对学生思维的发展、数学素养的提升都有重大的意义,蕴含着丰富的育人价值.本文以2019年人教A版的一道课后习题为例,以学生为主体,创设“生”动课堂,充分挖掘和利用教材习题中蕴含的数学育人资源,启动学生思维进行一题多解,提升逻辑推理和数学运算等素养.

以问题驱动促教学“生”动--一道教材例题探究的课堂实录与思考

本文以2020年人教A版选择性必修第一册第三章“圆锥曲线的方程”中的一道例题为例,教师在教学中以学生为主体,学生提出的问题串为明线,以数学思想方法为暗线,让问题在情境中驱动,开展“生”动教学,积累数学活动经验,发展学生学科核心素养.

我国大豆生产波动动因分析——基于省际面板模型的实证研究

在我国大豆生产波动频繁的情况下,找出影响大豆单产、种植面积的影响因素是实现“提单产、稳面积”的首要举措。研究采用1999~2020年21个省份面板数据,在分析大豆单产、种植面积的变化趋势基础上,根据大豆单产增减趋势,把大豆产区划分成增产区、减产区和波动区,采用改进的面板数据模型分别对三个产区的大豆单产和种植面积的影响因素进行实证分析。结果表明,机械化收割、产研结合、农药投入、小型拖拉机的投入是影响不同区域大豆单产的显著因素;机械化耕作是提升所有区域种植面积的显著因素,玉米种植面积、化肥投入、农药投入、灌溉条件、科研资金与人员投入、产研结合、机械化收割是影响不同区域大豆种植面积显著因素。根据分析,提出了相应政策建议。

基于小组合作的小学英语作业讲评策略探究

作业讲评是教学中必不可少的一个重要环节,通过此环节,我们可以帮助学生分析课堂学习情况,查找问题并弥补知识漏洞。我们应该正视当前讲评课堂出现的讲评目标不明确、讲评方式单一、学生听讲效率低、讲评后没有得到有效反馈的问题。基于此,探索有效的讲评策略以激发学生的课堂积极性并提升讲评效能具有重要意义。在此,笔者结合教学实践对基于小组合作的作业讲评策略进行初步分析与探究。

Lecturers’Efforts in Building Rapport in the English-Medium Instruction(EMI)Context:Focus on the Use of Communication Strategies

Past studies reveal the prevalence of anxiety,coupled with low motivation and disengagement among students in English-medium instruction(EMI)programs.Given the detrimental impact these negative emotions can have on learning outcomes,it is imperative that teachers establish positive emotional rapport with their students.This study explores how experienced and highly rated EMI lecturers at a Chinese university’s overseas campus use communication strategies to build rapport with their students during interactive academic activities.It identifies the strategies used by these lecturers and examines how the strategies facilitate the teaching-learning process.The data,consisting of 10 hours of tutorials and 10 hours of supervisor-student supervision meetings,is analyzed using an adapted Conversation Analysis(CA)approach.The analysis reveals three types of communication strategies(CSs)frequently used by lecturers:back-channeling,codeswitching,and co-creation of messages.By employing these strategies,the lecturers established a strong rapport with the students,which created an encouraging and supportive learning environment.Consequently,this positive atmosphere facilitated students’learning of content knowledge through English.The findings of this study have implications for the training of lecturers who encounter difficulties in establishing rapport with multilingual students in the EMI setting.

Rate Law for Photoelectrochemical Water Splitting Over CuO

Photocatalytic splitting of water over p-type semiconductors is a promising strategy for production of hydrogen.However,the determination of rate law is rarely reported.To this purpose,copper oxide(CuO)is selected as a model photocathode in this study,and the photogenerated surface charge density,interfacial charge transfer rate constant and their relation to the water reduction rate(in terms of photocurrent)were investigated by a combination of(photo)electrochemical techniques.The results showed that the charge transfer rate constant is exponential-dependent on the surface charge density,and that the photocurrent equals to the product of the charge transfer rate constant and surface charge density.The reaction is first-order in terms of surface charge density.Such an unconventional rate law contrasts with the reports in literature.The charge density-dependent rate constant results from the Fermi level pinning(i.e.,Galvani potential is the main driving force for the reaction)due to accumulation of charge in the surface states and/or Frumkin behavior(i.e.,chemical potential is the main driving force).This study,therefore,may be helpful for further investigation on the mechanism of hydrogen evolution over a CuO photocathode and for designing more efficient CuO-based photocatalysts.

Ecological environmental quality evaluation and driving factor analysis of the Lijiang River Basin,based on Google Earth Engine

For regional ecological management,it is important to evaluate the quality of ecosystems and analyze the underlying causes of ecological changes.Using the Google Earth Engine(GEE)platform,the remote sensing ecological index(RSEI)was calculated for the Lijiang River Basin in Guangxi Zhuang Autonomous Region for 1991,2001,2011,and 2021.Spatial autocorrelation analysis was employed to investigate spatiotemporal variations in the ecological environmental quality of the Lijiang River Basin.Furthermore,geographic detectors were used to quantitatively analyze influencing factors and their interaction effects on ecological environmental quality.The results verified that:1)From 1991 to 2021,the ecological environmental quality of the Lijiang River Basin demonstrated significant improvement.The area with good and excellent ecological environmental quality in proportion increased by 19.69%(3406.57 km^(2)),while the area with fair and poor ecological environmental quality in proportion decreased by 10.76%(1860.36 km^(2)).2)Spatially,the ecological environmental quality of the Lijiang River Basin exhibited a pattern of low quality in the central region and high quality in the periphery.Specifically,poor ecological environmental quality characterized the Guilin urban area,Pingle County,and Lingchuan County.3)From 1991 to 2021,a significant positive spatial correlation was observed in ecological environmental quality of the Lijiang River Basin.Areas with high-high agglomeration were predominantly forests and grasslands,indicating good ecological environmental quality,whereas areas with low-low agglomeration were dominated by cultivated land and construction land,indicating poor ecological environmental quality.4)Annual average precipitation and temperature exerted the most significant influence on the ecological environmental quality of the basin,and their interactions with other factors had the great influence.This study aimed to enhance understanding of the evolution of the ecological environment in the Lijiang River Basin of Guangxi Zhuang Autonomous Region and provide scientific guidance for decision-making and management related to ecology in the region.

Sn nucleation and growth from Sn(II)dissolved in ethylene glycol:Electrochemical behavior and temperature effect

Thermodynamic and kinetic aspects of Sn nucleation and growth processes onto a glassy carbon electrode from SnCl2·2H2O dissolved in ethylene glycol solutions were studied.Typical reduction and oxidation peaks observed in voltammograms have demonstrated the capability of ethylene glycol solutions to electrodeposit Sn.The temperature-dependence of diffusion coefficient values derived from potentiodynamic and potentiostatic studies helped to determine and validate estimations of the activation energy for Sn(II)bulk diffusion.Chronoamperometric results have identified that,the suitable model to describe the early stage of Sn electrodeposition could be composed of Sn three-dimensional nucleation and diffusion-controlled growth and water reduction contributions,which was duly validated by theoretical and experimental approaches.From the model,typical kinetic parameters such as the nucleation frequency of Sn(A),number density of Sn nuclei(N_(0)),and diffusion coefficient of Sn(II)ions(D),were determined.The presence of Sn nuclei with excellent quality and their structures were verified using SEM,EDX,and XRD techniques.

Enabling Technologies for Autonomous Robotic Systems in Manufacturing

Research of autonomous manufacturing systems is motivated both by the new technical possibilities of cyber-physical systems and by the practical needs of the industry.Autonomous operation in semi-structured industrial environments can now be supported by advanced sensor technologies,digital twins,artificial intelligence and novel communication techniques.These enable real-time monitoring of production processes,situation recognition and prediction,automated and adaptive(re)planning,teamwork and performance improvement by learning.This paper summarizes the main requirements towards autonomous industrial robotics and suggests a generic workflow for realizing such systems.Application case studies will be presented from recent practice at HUN-REN SZTAKI in a broad range of domains such as assembly,welding,grinding,picking and placing,and machining.The various solutions have in common that they use a generic digital twin concept as their core.After making general recommendations for realizing autonomous robotic solutions in the industry,open issues for future research will be discussed.

Effect of Si on growth kinetics of intermetallic compounds during reaction between solid iron and molten aluminum

The effect of Si on the growth kinetics of intermetallic compounds during the reaction of solid iron and molten aluminum was investigated with a scanning electron microscope coupled with an energy dispersive X-ray spectroscope, and hot-dip aluminized experiments. The results show that the intermetallic layer is composed of major Fe2Al5 and minor FeAl3. The Al-Fe-Si ternary phase, rl/rg, is formed in the Fe2Al5 layer. The tongue-like morphology of the Fe2Als layer becomes less distinct and disappears finally as the content of Si in aluminum bath increases. Si in the bath improves the prohibiting ability to the growth of Fe2Als and FeAl3. When the contents of Si are 0, 0.5%, 1.0%, 1.5%, 2.0% and 3.0%, the activation energies of Fe2Al5 are evaluated to be 207, 186, 169, 168, 167 and 172 kJ/mol, respectively. The reduction of the activation energy might result from the lattice distortion caused by Si atom penetrating into the Fe2Al5 phase. When Si atom occupies the vacancy site, it blocks easy diffusion path and results in the disappearance of tongue-like morphology.

New Method to Restrain Pumping Voltage of Braking Procedure for Brushless DC Motor of Electric Armored Vehicle

In order to restrain the high pumping voltage of braking procedure which is harmful to the system of electric armored vehicle. Based on the analysis of pumping voltage of the braking procedure, the relation between pumping voltage and PWM ratio is derived and a new digital control method to restrain the pumping voltage by changing PWM ratio is put forward. Because the capacitance is decreased effectively, the volume of controller is reduced and the performance to price ratio is improved. The results of computer simulation and experiment proved that this method is feasible and valid.

Effect of Rhubarb Decoction on the Isolated Intestinal Movement of Ophicephalus argus

[Objective] The aim of this study was to investigate effects of rhubarb decoction with different concentrations on the isolated intestinal movement performance of Ophicephalus argus,and to discuss its pharmacological mechanism.[Method] With RM6240C biological signal collection and processing system,tension values of the isolated intestine before and after the treatment by rhubarb decoction with different concentrations were recorded by the isolated organ method.[Result] Rhubarb decoction with concentration of 0.062 and 0.125 g/ml showed obvious enhancement on the isolated intestinal contraction of Ophicephalus argus,while rhubarb decoction with concentration of 0.250 and 0.500 g/ml showed inhibition on the isolated intestinal contraction of Ophicephalus argus.There was an extremely significant difference in rhubarb decoction with concentration of lower than 0.500 g/ml and more than 0.500 g/ml.With the increase of rhubarb concentration,the intestinal movement of Ophicephalus argus enhanced,but the contraction frequency did not change obviously.[Conclusion] Rhubarb decoction has remarkable effects on the contraction of smooth muscle in the isolated intestines of Ophicephalus argus.

Bioturbation Effects of Branchiura sowerbyi (Tubificidae) on the Vertical Transport of Sedimentary Particles in Paddy Field

[Objective] The research aimed to investigate the bioturbation effects of Branchiura sowerbyi （Tubificidae） on the vertical transport of sedimentary particles in paddy field,and explore the bioturbation effects and mechanism of benthic Annelida in coupling process of benthic-pelagic interface.[Method]Using chemically stable glass beads as tracers,the vertical transport of sedimentary particles in paddy field was analyzed comparatively with and without B.sowerbyi.[Result]After 10 days＇ bioturbation of B.sowerbyi,41.3% of the glass beads on the surface of sedimentary particles were transferred downward to the maximum depth of 9.4 cm,and the vertical transportation rate of sedimentary particles was 1.370×10-3/（g·cm2·d）. 25.8% and 17.3% of glass beads at a depth of 6 cm were transferred upwards and downwards respectively after bioturbation,to the maximum depth of 5.2 and 2.7 cm respectively,and the vertical transportation rates of sedimentary particles were 8.557×10-4 and 5.738×10-4/（g·cm2·d） respectively.[Conclusion]The sedimentary particles on the surface and deep layer of the paddy field were vertically shifted by the physical activities of B.sowerbyi,thus changed the sedimentary environment.

Vibration control of pedestrian-bridge vertical dynamic coupling interaction based on biodynamic model

The human-induced vertical vibration serviceability of low-frequency and lightweight footbridges is studied based on the moving mass-spring-damper（MMSD） biodynamic model, and the mass damper（TMD） with different optimal model parameters being used to control the vertical vibration.First, the MMSD biodynamic model is employed to simulate the pedestrians, and the time-varying control equations of the vertical dynamic coupling system of the pedestrian-bridgeTMD are established with the consideration of pedestrianbridge dynamic interaction; and the equations are solved by using the Runge-Kutta-Felhberg integral method with variable step size. Secondly, the footbridge dynamic response is calculated under the model of pedestrian-structure dynamic interaction and the model of moving load when the pedestrian pace frequency is consistent with the natural frequency of footbridge. Finally, a comparative study and analysis are made on the control effects of the vertical dynamic coupling system in different optimal models of the TMD. The calculation results show that the pedestrian-bridge dynamic interaction cannot be ignored when the vertical human-induced vibration serviceability of low-frequency and light-weight footbridge is evaluated. The TMD can effectively reduce the vibration under the resonance of pedestrian-bridge, and TMD parameters are recommended for the determination by the Warburton optimization model.