汇川H2U系列PLC之间RS-485通信的实现     

尚丽  叶国平 《苏州市职业大学学报》2020,(2):15-21

主要研究了汇川公司H2U可编程控制器(PLC)的通信技术,实现了两个H2U系列PLC之间基于RS-485的通信,并详细介绍了PLC之间通信的硬件连接方式、通信串口参数配置、触摸屏画面的设计以及程序实现。所讨论的方法已在采用H2U PLC及辅助设备组建的"运动控制系统"课程的教学实验平台上进行了验证,可以拓展应用于多台H2U PLC之间以及其他设备与H2U PLC之间的RS-485通信实现,对工程应用具有一定的借鉴意义。  相似文献   

Breaking Down Barriers for Student Parents and Caregivers with Family-Friendly Library Spaces     

Anne Cooper Moore  Rebecca Croxton  Lindsey Sprague 《图书馆管理杂志》2020,60(3):215-234

Abstract

In 2016, J. Murrey Atkins Library at the University of North Carolina at Charlotte opened a reservable study room where student parents and caregivers can study with their children on campus. In 2018, the library opened a second family-friendly study room to meet the needs of our growing campus community. To inform the room design, the library conducted a mixed methods research study that included a user survey, an examination of room reservation and usage data, and one-on-one user interviews. This paper focuses on the user-centered design process used to inform the development of the second, family-friendly, library study room.  相似文献   

国外知识组织体系管理工具比较分析与启示     

纪姗姗  赵炳容  刘峥 《图书情报工作》2021,64(24):73-83

[目的/意义] 比较分析语义网技术发展环境下国外代表性知识组织体系管理工具的研究现状及关键功能，梳理相关研究的发展趋势。[方法/过程] 通过网络调研法，遴选国外10个代表性知识组织体系管理工具，从结构定义、项目维护、数据管理、互操作性、操作环境等方面比较分析其发展现状。在此基础上，为国内知识组织体系管理工具的建设工作提供建议。[结果/结论] 研究发现，国内知识组织体系管理工具的建设工作应依托语义网、关联数据、语义集成、语义互操作等技术促进功能创新，包括：灵活设计并配置多类型数据模型、支持可持续发展的管理与维护机制、支持用户分布式协同管理与控制、知识驱动的数据迭代式更新、面向语义的KOS重用与进化、建设以KOS为核心的知识组织框架等。  相似文献   

网球精英运动员赛间训练调控影响因素SEM分析     

汤国进  邹克宁 《武汉体育学院学报》2020,54(9):86-94

为定量解释精英运动员重大比赛期间竞技状态显性和隐性影响因素间相互关系，运用文献资料、层次分析、模糊评价、数理统计等研究方法，基于国家队、省市运动队295名网球教练员、运动员调研数据，提出精英网球运动员重大比赛期间竞技状态影响因素假设命题，再引入SEM概念模型，对假设命题进行验证。结果表明：（1）竞技状态SEM概念模型中，体能训练整合度、技能训练整合度、心智训练整合度、适应度与保障度可作为隐性自变量，且均对竞技状态因变量有正向影响作用，H₁、H₂、H₃、H₄假设命题得到验证；（2）经SEM检验，依影响因素权重，精英网球运动员赛间竞技状态调控依次表现为技能训练整合度、心智训练整合度、体能训练整合度、适应度与保障度；（3）精英网球运动员的参赛表现，虽主要取决于竞技训练因子，但对于适应度与保障度中自然环境、社会环境和规程规则等非训练因子，同样不容忽视。  相似文献   

Sociomaterial movements of students' engagement in a school's makerspace     

Kristiina Kumpulainen  Anu Kajamaa 《British journal of educational technology : journal of the Council for Educational Technology》2020,51(4):1292-1307

This study investigates the sociomaterial movements of student engagement in a school's makerspace. Here, we understand sociomaterial movements as emergent and relational, comprising complex dynamics of agency across students, teachers and materials in situated, culturally framed activities. Our study draws on data comprising 85 hours of video recordings of 9–12-year-old students' (N = 94) engagement in a technology-rich makerspace in a Finnish elementary school. The video data were transcribed and analyzed qualitatively using a multimodal interaction analysis. The sociomaterial movements were found to be displayed across a tension-laden continuum between (1) procedural activity—analysis and reflection; (2) individual activity—collaboration; (3) “doing school”—empowerment; and d) alienation—identification. Together, the study offers a potential approach for investigating and understanding the often overlooked workings of sociomateriality that constitutes students' emergent engagement and learning opportunities in science, technology, engineering and mathematics (STEAM) learning contexts.  相似文献   

Increasing school personnel's self-efficacy,knowledge, and response regarding nonsuicidal self-injury in youth     

Sara D. Glennon  Shannon B. Viola  Alane O. Blakely 《Psychology in the schools》2020,57(1):135-151

Rates of students engaging in nonsuicidal self-injury (NSSI) are rising and additional supports in the schools are needed (Nock, 2010, Ann Rev Clin Psychol, 6, 339–363; Stargell et al., 2017, Prof Sch Couns, 21, 37-46). School psychologists, school counselors, and school nurses are key personnel in responding to self-injurious behaviors within the school setting. The results of a practice-based research project are described, in which school psychologists, school counselors, and school nurses participated in training to increase their self-efficacy, knowledge, and response in regard to NSSI. The training provided information regarding best practice in responding to NSSI in youth (Hasking et al., 2016, Sch Psychol Int, 37(6), 644–663; Kanan et al., 2008, Sch Psychol Forum: Res Prac, 2, 67–79; Walsh & Muehlenkamp, 2013, Sch Psychol Forum: Res Prac, 7, 161–171). This exploratory study indicated that training positively impacted participants' perceived self-efficacy and knowledge with respect to responding to youth who engage in NSSI. Handouts and resources for school-based staff are included. Limitations and future directions are discussed.  相似文献   

运动因子在心血管功能中的调控作用及相关机制研究进展     

于凤至  孙朋  刘淑卉 《中国体育科技》2020,(5):48-58

心血管疾病(cardiovascular disease,CVD)是包括动脉粥样硬化、心力衰竭、心脏缺血后再灌注损伤和心肌梗死等血管和心脏的复杂病症。血管内皮细胞、平滑肌细胞和心肌细胞生理功能障碍是诱发CVD的关键因素。研究表明,运动能够对心脏和动脉的形态、功能起到积极的调控作用,可作为CVD非药物疗法的重要手段之一。运动可通过调控多种运动因子的表达水平,如肌肉分泌的Fstl1、Irisin和MSTN,脂肪分泌的Omentin、Apelin、CTRP3和CTRP9,肝脏分泌的FGF21、ANGPTL3和ANGPTL4等,进而调控血管内皮细胞、平滑肌细胞和心肌细胞的分化、增殖和凋亡,从而发挥其防治CVD作用。本文试图梳理肌肉、脂肪和肝脏分泌的运动因子与调控心脏和动脉功能之间的相关信号通路及其机制,为运动干预防治CVD提供新的思路。  相似文献   

Psychological responses to reservation-based discrimination: A qualitative study of socially marginalized youth at a premier Indian university     

《International Journal of Educational Development》2020

Given the history of caste politics in India, it is not surprising that the socially marginalized students face discrimination, especially after the introduction of the reservation policy (affirmative action) in educational institutes. Our qualitative study, informed by Meyer’s Minority Stress model, analysed in-depth interviews with 30 undergraduate students, 3 faculty members, and 4 administrative officials at a premier Indian university to examine the psychological wellbeing of the reserved category students. We analysed how the discrimination processes contributed to students’ poor academic performance, low self-esteem, and weak motivation. Student group affiliations and university resources created a supportive environment for the socially marginalized, despite a small risk of stigmatization due to enrolment in a few campus support-programs. Moreover, there existed a palpable frustration among the socially privileged students, resulting in discriminatory attitudes against reserved categories but not “lower” caste. Our findings call for the attention of college administrators, policymakers, and the society at large to ensure that well-intended social justice policies are efficiently implemented, to deliver justice to the underprivileged students of India.  相似文献   

基于负样本多通道优化SSD网络的钢铁厂提取     

卢凯旋  李国清  陈正超  昝露洋  李柏鹏  高建威 《中国科学院大学学报》2020,37(3):352-359

准确提取钢铁厂对去产能监测和环境保护具有重要意义。传统的人工目视解译方法效率低、成本高，无法满足开展大区域钢铁厂监测的需求。以深度学习目标检测网络SSD为基础，构建面向遥感影像钢铁厂提取的深度学习目标检测网络，提出maxout模块，将负样本通路优化为多分支结构，突出难分负样本特征并提升网络对无用特征的抵制效果。利用国产GF-1数据对京津冀地区的钢铁厂进行快速自动提取实验。与人工解译的钢铁厂点位数据的对比表明，该目标检测方法的提取精度达到80%以上。  相似文献   

高校图书馆参与公共文化服务体系影响因素研究     

曹国凤  贾晓彦  张丽 《图书情报工作》2019,63(6):35-40

[目的/意义]构建高校图书馆参与公共文化服务体系影响因素模型，为高校图书馆公共文化服务发展提供理论和实践参考。[方法/过程]通过对10所高校26位采访对象的深度访谈，采用扎根理论方法，探索性研究高校图书馆参与公共文化服务体系影响因素，并构建其扎根理论模型。[结果/结论]高校图书馆参与公共文化服务体系影响因素主要包括4个主范畴：高校及其图书馆归因、政府机构归因、公众用户归因、其他归因。其中高校及其图书馆归因是主导性因素，政府机构归因是保障性因素，公众用户归因是驱动性因素，其他归因是制约性因素。在此基础上，提出高校图书馆深度参与公共文化服务体系策略。  相似文献