鞭天线车载倒伏系统的设计与实现

设计了由处理器模块、按键与显示模块、电机驱动模块、码盘计数模块、通信模块、状态记忆模块构成的鞭天线车载倒伏系统.它的电控部分以STC89S52单片机为控制核心,以电机驱动减速机设计天线倒伏控制器执行机构.经过测试,系统能够适应各种天气环境,控制精度较高,工作稳定.     

“Border Crossing”in English Job-Seeking Discourse-Informalization and Marketization in One Creative Résumé

Border crossing is a metaphoric term in sociolinguistics referring to a blurring of English use across different domains of social discourses. This article shows how border crossing in English job-seek...     

NM7Ti合金棒材超声波探伤异常反射波原因分析

在对超导用Nb47Ti合金棒材进行超声波探伤检查时,发现棒材多处存在异常反射波现象．通过低倍组织、高倍组织、变形实验、XRE和成分分析等,对异常反射波的原因进行了分析．结果表明,造成棒材超声波探伤杂波异常反射波的根本原因是成分的不均匀、异常反射波区域的Nb元素含量较高、低倍组织存在“亮斑”等,且锻棒经过大变形改锻仍无法消除异常反射波．     

基于电子双板的颠倒课堂模式探究--以“教育技术学研究方法”为例

教育信息化的发展、大数据时代的到来推动了大学课堂教学方式的革新,颠倒课堂成为众多教学研究者关注的焦点。基于电子双板环境的“颠倒课堂”教学模式以电子双板和网络课程学习平台为依托,以学案为导向,课前组织学习者利用网络课程平台中的视频和文本等资源进行自主学习和互动交流,课内借助电子双板以问题答疑、任务驱动、小组协作及汇报等方式促进知识内化,课后通过学习评测进行知识巩固与应用。在“教育技术学研究方法”课程实施中,基于电子双板环境的“颠倒课堂”教学模式能够有效提高学习者的学习成绩和研究能力,改善学习者的自主学习态度。将基于电子双板环境的“颠倒课堂”教学模式广泛应用于教学中,需要完善信息素养培训机制,加强电子双板的使用培训,激发学生的学习动机。     

Exploring the characteristics of an optimal design of non-programming plugged learning for developing primary school students’ computational thinking in mathematics

Existing computational thinking (CT) research focuses on programming in K-12 education; however, there are challenges in introducing it into the formal disciplines. Therefore, we propose the introduction of non-programming plugged learning in mathematics to develop students’ CT. The research and teaching teams collaborated to develop an instructional design for primary school students. The participants were 112 third- and fourth-grade students (aged 9–10) who took part in three rounds of experiments. In this paper, we present an iterative problem-solving process in design-based implementation research, focusing on the implementation issues that lead to the design principles in the mathematics classroom. The computational tasks, environment, tools, and practices were iteratively improved over three rounds to incorporate CT effectively into mathematics. Results from the CT questionnaire demonstrated that the new program could significantly improve students’ CT abilities and compound thinking. The results of the post-test revealed that CT, including the sub-dimensions of decomposition, algorithmic thinking, and problem-solving improved threefold compared to the pre-test between the three rounds, indicating that strengthened CT design enhanced CT perceptions. Similarly, the students’ and teacher’ interviews confirmed their positive experiences with CT. Based on empirical research, we summarize design characteristics from computational tasks, computational environment and tools, and computational practices and propose design principles. We demonstrate the potential of non-programming plugged learning for developing primary school students’ CT in mathematics.

     

饲用益生菌的筛选及发酵特性研究

以饲料为原料筛选出一株既产乳酸又产芽孢的益生菌,经过分子生物学鉴定为凝结芽孢杆菌(Bacillus coagulans),命名为T-8。从培养基碳源、氮源、有机物浸出液、培养基pH、培养温度、培养时间等方面对菌株T-8展开发酵特性研究,结果表明,最优培养基配方为:玉米粉6 g/L、豆粕粉15 g/L、小麦麸皮浸出液60%、酵母粉5 g/L、蛋白胨10 g/L、氯化钠10 g/L,pH 5.0。以5%的接种量将种子液转接至最优培养基,在47℃的摇床中以200 r/min的转速振荡培养28 h,菌株T-8的细胞密度达到4.8×10⁹ CFU/mL,芽孢率达到95.2%。本试验可为益生菌凝结芽孢杆菌应用于饲用微生物菌剂的工业化生产提供参考。     

职业院校学习成果认证探究

学习成果认证制度已成为衔接不同类型教育的桥梁和通道,对于职业教育的发展,尤其是扩招后的职业教育改革具有重要意义。梳理了学习成果认证制度的内涵、面临困境和在职业教育领域的作用,阐述了学习成果认证的机构设置、认证原则、工作与方法及认证过程的组织。根据认证的4个阶段划分办法,对在线开放课程、开放教育资源、非学历课程的认证案例进行了剖析,在此基础上提出了扩招背景下职业院校学习成果认证的实施路径。     

智慧法院建设的逻辑生成、现状描摹与路径优化

智慧法院是人工智能时代司法体制改革的必然趋势。顶层政府的设计、法院系统的需求与技术市场的利益驱动共同形成了中国智慧法院建设的逻辑体系。然而,上述逻辑体系带来了国家治理与基层实践的张力、“技术治理主义”的内卷化与“数字弱势群体”的程序选择权缺失的理论困境,同时也导致区域空间发展不均衡、建设水平与适用程度不匹配、技术手段应用与尊重应用者主体性的竞争关系处理不良等实践不足。在智慧法院4.0版本建设过程中,应强化智慧法院建设的顶层设计、建立以司法需求为导向的智慧法院成果开发机制和凸显应用者的主体性地位。     

Metal–Support Interactions on Ag/Co3O4 Nanowire Monolithic Catalysts Promoting Catalytic Soot Combustion

Transactions of Tianjin University - Tuning metal–support interactions (MSIs) is an important strategy in heterogeneous catalysis to realize the desirable metal dispersion and redox ability...