ASME-Ⅲ-5高温1级部件分析设计方法的改进方向探讨

ASME规范第Ⅲ卷第5册(简称ASME-Ⅲ-5)提供了核1级部件在高温下使用的设计分析方法和评定准则。本文对高温的定义进行简介,对ASME规范核1级部件在高温下考虑的设计载荷、失效机制、设计分析方法以及评定准则的特点进行总体介绍。通过对ASME规范与其他高温规范R5、RCC-MRx、MONJU在基于损伤模式下的载荷控制应力限制和变形控制限制的分析方法及准则进行对比,探究ASME规范在分析方法准则中的优势与局限性,得出ASME规范传统采用的基于应力分类的弹性分析法表现优异,但由于本身固有特性并不能完美解决规范所含括的各个失效机制的结论,提出若干项改进ASME-Ⅲ-5高温1级部件设计规范的方法。本文指出的ASME-Ⅲ-5可改进方向可进一步提高规范发展使用的先进性、经济性和安全性,同时对开发构建我国自主化的核承压高温使用1级部件设计规范具有指导作用。

Research on the Instructional Design of the Primary School English Reading Class

English promotes the development of globalization.The primary school English reading class has played an important role in the English learning life of students.The instructional design of the primary school English reading class will greatly affect students'interest in English reading.The paper attempts to study the problems in the primary school English reading classroom teaching,and propose some available corresponding measures to improve the primary school students'enthusiasm in English learning.Firstly,the paper expounds the definition,characteristics of the instructional design of class.Secondly,it analyzes the causes and solutions to the problems in the primary school English reading class.Finally,it proposes instructional designs to solve these problems.The research in the paper is of great help to improve the efficiency of the students'English reading in primary school and the classroom teaching of the English reading and even to make students learn English better.

Design and Coupled Thermo-Mechanical Analysis of Silicon Carbide Primary Mirror Assembly

Based on the principle that the thermal expansion coefficient of the support structure should match that of the mirror, three schemes of primary mirror assembly were designed. Of them, the first is fused silica mirror plus 4J32 flexible support plus ZTC4 support back plate, the second K9 mirror plus 4J45 flexible support plus ZTC4 support back plate, and the third SiC mirror plus SiC rigid support back plate. A coupled thermo-mechanical analysis of the three primary mirror assemblies was made with finite element method. The results show that the SiC assembly is the best of all schemes in terms of their combination properties due to its elimination of the thermal expansion mismatch between the materials. The analytical results on the cryogenic property of the SiC primary mirror assembly show a higher surface finish of the SiC mirror even under the cryogenic condition.

The Effective Teaching Design of Primary School English Classroom Based on BOPPPS Teaching Mode

Teachers are crucial to the success of primary school English teaching.As to BOPPPS teaching mode,it is well-known for its effectiveness of teaching and values the enhancement of teachers’teaching ability.In order to integrate BOPPPS mode into primary school English teaching,there is a need to elaborate bridge-in,and clarify the learning objective.Then based on the pre-assessment,teachers are supposed to know students’prior knowledge,interest,and ability.For the participatory learning,which emphasizes both teacher-student interaction and student-student interaction,the activities should be diversified and interesting.In addition,during the stages of post-assessment and summary,teachers should pay close attention to learning outcome,offer feedback timely,and guide students to make reflection.

6-21 Primary Design of Beam Dynamics on Compact C-band Electron Linear Accelerator for High Energy Electron Radiography

At the beginning of 2014, the Institute of Modern Physics started to develop the research of high energy electronradiography towards high energy density state/inertial confinement fusion diagnostics. One of the important topicsis the electron linac specification for the high energy density target imaging system. A C-band electron Linac wasselected in order to meet the specific requirement of beam dynamics parameters and achieve a compact design,which is designed to work at the frequency of 5.712

On Design Principles of Micro-lectures of theme-based English Vocabulary for High-grade Primary School Students——A Case Study of a Class of Fifth-grade students in ECNU Affiliated Primary School

For English education primary school,English vocabulary teaching should be attach importance to because in the traditional class of English vocabulary teaching,teachers just fill young minds with knowledge points of each word in a 35-minute class yet fail to lay emphasis of learners’meaningful learning and autonomic learning as well as their very limited attention spans.To support traditional English vocabulary teaching classes,the research proposes the theme-based English vocabulary micro-lectures designed on the basis of experiential learning theory and constructivist learning theory as well as the analyses of target users of high-level students in the primary school.After application of the micro-lectures into practice,the research assesses the effect of the micro-lectures on the learners and then makes suggestions for design principles of theme-based vocabulary micro-lectures about selection of contents and vocabulary themes,supplementary teaching activities and teacher interaction in the micro-lectures for high-level students in the primary school.Also,the designers should make multi-level English vocabulary micro-lectures according to learners’English proficiency and increase repetition rates of vocabularies in the micro-lectures.

The Design Strategy of High-Density Primary Schools in Shenzhen

The construction of high-density primary schools in Shenzhen is facing new challenges.Therefore,it is essential to look for ways to meet the demand for degrees,realize education and teaching reform,eliminate the shackles of design code,and adapt to the local climate.From the perspective of design methodology,this article discusses the design strategy of Shenzhen’s high-density primary school campus from four aspects:compact layout,multiple functions,open space,and personalized design,aiming to provide ideas for the construction of primary school campuses.

An Assessment Scale for Evaluating the Experimental Design Ability of Elementary Science Teachers Based on Primary Trait Analysis

In this study,an assessment scale for evaluating the experimental design ability of elementary science teachers was constructed based on primary trait analysis.This assessment scale contains three first-level indexes and eleven second-level indexes.The corresponding weights of indexes were determined by the objective weighting method.The scores of all the descriptions of the indexes were also assigned.After a trial test,this assessment scale was verified to be reliable and valid for evaluating the experimental design ability of elementary science teachers.

STEAM教育理念下小学科学课程的有效实施研究——以《声音的传播》为例

在教育信息化2.0背景下,加快教育现代化、信息化发展是目前教育界面临的一大挑战。作为现代教育发展的产物——智慧课堂,其是一种通过整合教学资源,营造先进的新一代智能、信息化、网络空间等学习平台,促进学生智慧思维和创新能力协同发展的新型教育形式。智慧课堂以其自身的功能特性为小学科学教育带来了新的教学原则、教学理念和教学方法,因此,探索有效的智慧课堂教学模式已成为教育革新的热点。本文深入研究了“互联网+”、大数据、人工智能、教育网络云端等现代化教育资源,并将智慧课堂应用在小学科学教学中,探索小学科学智慧课堂教学的多样性及有效性,以期让不同的学生实现文化知识与思想思维的碰撞,有效提升小学生的创新思维和实践能力。

Double-Moduli Gaussian Encryption/Decryption with Primary Residues and Secret Controls

In this paper an encryption-decryption algorithm based on two moduli is described: one in the real field of integers and another in the field of complex integers. Also the proper selection of cryptographic system parameters is described. Several numeric illustrations explain step-by-step how to precondition a plaintext, how to select secret control parameters, how to ensure feasibility of all private keys and how to avoid ambiguity in the process of information recovery. The proposed cryptographic system is faster than most of known public key cryptosystems, since it requires a small number of multiplications and additions, and does not require exponentiations for its implementation.

Research on the Effectiveness of English Homework in Primary School

English is a bridge connecting the whole world, and its importance is increasingly obvious. There are many links in theprocess of learning English, among which homework is an extension of class and a part that cannot be neglected. Because of the loweffectiveness of traditional homework in primary school English, this paper summarizes the reasons and explores effective ways todesign homework to improve the quality of primary English homework, promote the development of primary school English teach-ing, and improvement of students’ language skills.

Effect of Professional Designation on the Level of Task Performance by Community Health Workers in Enugu State

The study aimed at assessment of level of task performance of Primary Health Care Worker （PHCWs） according to their professional designations in selected Local Government Areas （LGA） in Enugu State. Descriptive survey research was used. 291 PHCWs were randomly selected from 9 LGA using a multistage method. Questionnaire was used to collect data and the instrument was validated using test-retest method with correlation coefficient of 0.79. The findings show that Community Health Extension Workers （CHEWs） performed higher than Environmental Health Officer （EVO） and Community Health Officers （CHOs） in the area of health education concerning prevailing health problems and method of control. They scored 66.09% as against 52.8% and 60.61% for EVO and CHEW respectively. The result showed that the professional designation has no significant effect （P 〈 0.05） on the level of task performed by PHCW and their levels of task performance were low. It was recommended that public Health physicians and Nurses should be involved in the PHC in Enugu State to provide the fight supervision to the PHCW.

基于ADDIE模型的小学信奥赛课程设计——以“冒泡排序”课程设计为例

目前,全国信息学奥林匹克竞赛(简称“信奥赛”)的研究大多集中在中学阶段,小学阶段涉及较少且学校信奥赛课程缺乏系统、规范、科学的体系设计。通过分析目前学校信奥赛课程存在的问题,结合ADDIE模型的特征,以“冒泡排序算法”为例探究基于ADDIE模型的小学阶段信奥赛课程设计。

CAD/CAM树脂暂时冠在乳前牙大面积缺损修复中的应用效果分析

目的:分析计算机辅助设计与制造(Computer aided design/Computer aided manufacturing,CAD/CAM)树脂暂时冠修复乳前牙大面积缺损的疗效。方法:选取2018年2月-2023年6月于笔者医院进行治疗的108例乳前牙大面积缺损患儿为研究对象,依据入院先后顺序将其分为两组。对照组给予光固化复合树脂充填(n=54),观察组给予CAD/CAM树脂暂时冠修复(n=54),观察两组患儿的修复效果。结果:修复后3个月,两组缺损乳前牙修复体表面情况、色泽协调性、边缘密合度、继发龋比较差异均无统计学意义(P>0.05),修复后6个月,观察组缺损乳前牙修复体表面、色泽协调性、边缘密合度、继发龋有效率均高于对照组(P<0.05)。修复后3个月和6个月,两组缺损乳前牙牙龈炎症比较差异均无统计学意义(P>0.05)。结论:CAD/CAM树脂暂时冠在乳前牙大面积缺损修复中的效果较好,较光固化复合树脂充填更能够改善患儿远期预后。

基于ECD模型的小学低年级学生核心素养评价:设计、实施与反思

“双减”背景下,低年级无纸化测评已在全国各地小学开展,然而如何综合、科学地测评低年级学生的核心素养一直是基础教育测评实践中的热点和难点。根据中国学生发展核心素养,遴选小学低年级学生可评估的7个基本要点,在此基础上,依据证据中心设计(ECD)模型,从学生模型、任务模型、证据模型、组合模型、呈现模型和交付系统模型角度架构出小学低年级学生核心素养评价框架,并付诸实施。实施效果显示,基于ECD模型的小学低年级核心素养评价提供了多角度的综合评价方式,既提高了测评的科学性,也提高了教师的教育评价素养。为了更科学地应用ECD模型评价小学低年级学生的核心素养,今后应依托专业培训,进一步提升教师理解测评模型的深度与广度;注重证据收集的全面性,平衡学生发展核心素养与学科核心素养的关系;借助信息技术,真实、全面地刻画学生核心素养画像。

“基于网络的基础教育英语跨越式创新试验”教学设计实例——《The Family》教学设计

"基于网络的英语教育跨越式发展创新试验"是何克抗教授主持的国家级课题,笔者作为何教授的博士生参与了试验并负责大连和番禺试验区的工作。跨越式试验在以语觉论为首的先进教育理论的指导下,为构建新的小学英语教学设计体系进行了有益的探索。本文以一节示范课的教学设计为例来介绍跨越式小学英语教学设计模式。

基于MPS4021的20W LED驱动电源设计

采用原边反馈方案设计出一款20W LED驱动电源,通过变压器初次级隔离省去了副边反馈电路,提高了驱动电源的安全性和可靠性,并节约了BOM成本。所设计的驱动电源实现了在全电压范围内输出电流精度达±5%、功率因数大于0.9、效率大于85%,使用寿命大于3万小时,电磁干扰符合EN55015限制要求,并且具备有过流保护和过压保护功能,对设计大功率LED驱动电源具有一定的参考价值。

Progress of polymer reaction engineering:From process engineering to product engineering

Polymer reaction engineering studies the design,operation,and optimization of reactors for industrial scale polymerization,based on the theory of polymerization kinetics and transfer processes(e.g.,flow,heat and mass transfer).Although the foundation and development of this discipline are less than80 years,the global production of polymers has exceeded 400 million tons per annum.It demonstrates that polymer reaction engineering is of vital importance to the polymer industry.Along with the matu rity of production processes and market saturation for bulk polymers,emerging industries such as information technology,modern transportation,biomedicine,and new energy have continued to develop.As a result,the research objective for polymer reaction engineering has gradually shifted from maximizing the efficiency of the polymerization process to the precise regulation of high-end product-oriented macro molecules and their aggregation structures,i.e.,from polymer process engineering to polymer product engineering.In this review,the frontiers of polymer reaction engineering are introduced,including the precise regulation of polymer chain structure,the control of primary aggregation structure,and the rational design of polymer products.We narrow down the topic to the polymerization reaction engineering of vinyl monomers.Moreover,the future prospects are provided for the field of polymer reaction engineering.

基于STEM的小学科学课教学设计研究——以“搭高塔”课程为例

随着技术的不断革新,传统教育受到了前所未有的挑战,社会发展迫使教育必须做出改变,STEM教育逐渐开始兴起。同时,随着我国对素质教育的重视,在小学教学中,科学课这门课程的地位也越来越高。本文将STEM与小学科学课相结合,以"搭高塔"一课为例,探究基于STEM的小学科学课教学设计。

基于STEAM教育的中小学人工智能教育研究——以“机器会思考吗”一课为例

基于STEAM教育开展中小学人工智能教育,是新时代培养人才核心素养的新途径。文章聚焦于STEAM教育的核心特征,深挖STEAM教育融入中小学人工智能教育的切入点。在此基础上,文章从融合视角、项目视点、人文视域三个维度,构建了基于STEAM教育的中小学人工智能教育模式。最后,文章在“机器会思考吗”一课中进行了基于STEAM教育的中小学人工智能教育模式的应用。将STEAM教育融入中小学人工智能教育,有助于改善中小学人工智能教育的偏航问题,助力培养智能时代的人才,推动基础教育教学改革。