摘要：结合生产实际使用情况,对曲柄压力机中机械式、液压式,气液式三种典型的过载保护装置进行了比较,分析了各自的利弊,阐述了曲柄压力机三种过载保护装置的设计思想与方法。

摘要：通过对我国137项调水工程整理分析,采用定性归纳法和聚类分析法,增加行政区域分布、输水干线总长度、供水对象分类特征,构建调水工程分类体系,并采取分类指标对全国调水工程进行统计。开展调水工程的分类方法研究工作,制定分类标准体系,有利于建立全国调水工程数据台账,加强调水工程信息化管理薄弱环节,可为管理单位指导水资源调度并监督实施、组织指导大型调水工程前期工作及指导监督跨区域跨流域调水工程的调度管理等提供重要技术支持。

摘要：文章根据南水北调档案管理相关要求,在对南水北调工作及其档案成果进行历史性回顾的基础上,介绍了南水北调档案管理相关经验及做法,分析了档案管理应坚持的原则,并对大数据时代如何做好南水北调档案管理工作提出了思路和探讨。

摘要：研究一种智能扫地机器人。从硬件系统控制模块设计到主要技术调试进行了较详细的阐述。以STM32单片机为控制核心与电机驱动、红外线路径识别模块等相互协调应用。进行电路搭建和程序编写。实现了智能扫地机器人红外线避障和自动扫地功能,其清扫面积能达到约70%,清扫率约60%,很大程度受到自身机械机构的限制,后期将对小车的机械结构进行完善。

摘要：Tissue implant-related infections are among the most serious complications after surgical implantation,including orthopedics and *** with antibacterial ion release systems are efficient and economical antibiotic substitutes to fight against bacterial ***,the excessive amount of released antibacterial ions may cause biological toxicity while killing *** raises a fundamental issue on how to properly control the amounts of ions and their ***,we develop low-dose antibacterial ions-incorporated ferroelectric implants(copper-doped potassium sodium niobate,K0.5Na0.5NbO3-Cu,KNNCu)whose surface potential can be tuned via external *** released Cu2+ions can be targeted to bacteria via endogenous electric field(EEF)between KNNCu implants and negatively charged ***,the antibacterial efficacy of the implants is determined by the amount of Cu^2+ions that reaches bacteria,instead of the total amount of released Cu2+*** amount of Cu2+ions reaching bacteria from the high-surface-potential implant is 2.4 times that from the lowsurface-potential implant within 12 h,resulting in the increased antibacterial ratio from about 65%to 100%,while remaining low cell *** work provides insights into the specific role of the EEF in guiding mass transport between charged materials and living organisms,and a new perspective for the design of high-performance antibacterial biomaterials.