Application of Control Technology Based on PLC in Power Supply and Distribution System

With the rapid development of China＇s economy, the entire social requires the safety, reliability and automation of power supply and distribution system must be improved. Therefore, extensive application of PLC technology in power supply and distribution system has great significance to ensure normal social life and production, so as to realize the entire national economy sustained and healthy development. This paper briefly introduces the PLC technology, and with practice elaborates the applications of control technology based on PLC in power supply and distribution system fi：om the reform of low-voltage distribution system, automation management and relay protection of power supply and distribution system etc.

Key technologies and applications of intelligent dispatching command for high-speed railway in China

Purpose–The intelligent Central Traffic Control(CTC)system plays a vital role in establishing an intelligent high-speed railway(HSR)system.As the core of HSR transportation command,the intelligent CTC system is a new HSR dispatching command system that integrates the widely used CTC in China with the practical service requirements of intelligent dispatching.This paper aims to propose key technologies and applications for intelligent dispatching command in HSR in China.Design/methodology/approach–This paper first briefly introduces the functions and configuration of the intelligent CTC system.Some new servers,terminals and interfaces are introduced,which are plan adjustment server/terminal,interface for automatic train operation(ATO),interface for Dynamic Monitoring System of Train Control Equipment(DMS),interface for Power Supervisory Control and Data Acquisition(PSCADA),interface for Disaster Monitoring,etc.Findings–The key technologies applied in the intelligent CTC system include automatic adjustment of train operation plans,safety control of train routes and commands,traffic information data platform,integrated simulation of traffic dispatching and ATO function.These technologies have been applied in the Beijing-Zhangjiakou HSR,which commenced operations at the end of 2019.Implementing these key intelligent functions has improved the train dispatching command capacity,ensured the safe operation of intelligent HSR,reduced the labor intensity of dispatching operators and enhanced the intelligence level of China’s dispatching system.Originality/value–This paper provides further challenges and research directions for the intelligent dispatching command of HSR.To achieve the objectives,new measures need to be conducted,including the development of advanced technologies for intelligent dispatching command,coping with new requirements with the development of China’s railway signaling system,the integration of traffic dispatching and train control and the application of AI and data-driven modeling and methods.

Distributed Generation Application in the Rural Areas of West China

In this paper, at first the appearance background electricity grid in the rural areas of west China, and its meaning as well as the concept and structure of DG technologies are resented, and a DG technologies mode of development in the rural areas of west China is given. The development ideas and the future development direction of DG in are compared and summarized. At last, the significance of DG in future development of the rural areas of west China is prospected and some problems to be especially considered in the domestic research on DG technologies are put forward.

The History, Trend, Types, and Mitigation of Distributed Denial of Service Attacks

Over time, the world has transformed digitally and there is total dependence on the internet. Many more gadgets are continuously interconnected in the internet ecosystem. This fact has made the Internet a global information source for every being. Despite all this, attacker knowledge by cybercriminals has advanced and resulted in different attack methodologies on the internet and its data stores. This paper will discuss the origin and significance of Denial of Service (DoS) and Distributed Denial of Service (DDoS). These kinds of attacks remain the most effective methods used by the bad guys to cause substantial damage in terms of operational, reputational, and financial damage to organizations globally. These kinds of attacks have hindered network performance and availability. The victim’s network is flooded with massive illegal traffic hence, denying genuine traffic from passing through for authorized users. The paper will explore detection mechanisms, and mitigation techniques for this network threat.

Application of Millimeter 3D Automatic Paving System in Highway Engineering Construction

In the construction of asphalt mixture pavement,there are many paving construction procedures,high requirements for machinery and personnel,unreasonable technology and so on.In this paper,the millimeter-scale 3D automatic paving control technology of asphalt mixture pavement is studied with an engineering example.From the analysis of the test results in the later stage of construction,it can be seen that the technology has achieved the goal of high precision paving,and the successful application of the technology provides valuable reference experience for similar asphalt concrete pavement construction in the future.

Adaptive Controller Placement in Software Defined Wireless Networks

Controller placement problem(CPP)is a critical issue in software defined wireless networks(SDWN).Due to the limited power of wireless devices,CPP is facing the challenge of energy efficiency in SDWN.Nevertheless,the related research on CPP in SDWN hasn’t modeled the energy consumption of controllers so far.To prolong the lifetime of SDWN and improve the practicability of research,we rebuilt a CPP model considering the minimal transmitted power of controllers.An adaptive controller placement algorithm(ACPA)is proposed with the following two stages.First,data field method is adopted to determine sub-networks for different network topologies.Second,for each sub-network we adopt an exhaustive method to find the optimal location which meets the minimal average transmitted power to place controller.Compared with the other algorithms,the effectiveness and efficiency of the proposed scheme are validated through simulation.

A Protocol to Develop Phenolic Emulsifiers Used in Micro-surface by Control Technology

The phenolic emulsifiers used in emulsified asphalt of micro-surfacing, which was the most important tools in the road maintenance, were investigated by control technology. Many factors influencing this reaction were studied and three kinds of phenolic emulsifiers were prepared without catalyst in ethanol. The performance was researched that 2-（{2-[2-（2-Amino-ethylamino）-ethylamino]-ethyl-amino}-methyl）-4- nonyl-phenol （abbreviated as TETA） could be used in micro-surface. With addition of 0.5 % demulsifier, the mixing time was extended to 120 seconds obviously, and the cohesion torque （60 min） was 2.8 N＊m, which satisfied the opening traffic time shorter than 1 h. The wet track abrasion （6 d） was lower than 807 g/m2, with interracial modifier added, but the load wheel was increased with interfacial modifier increasing. When the TETA： demulsifier： interracial modifier =3：1：3, excellent performance was obtained and the experimental results met the International Slurry Surfacing Association （ISSA） standard. The synthesis process of this emulsifier is simple and the performance used in micro-surface was excellent, so this kind of emulsifier could have a better application future.

Design and Simulation of a Electrorheological(ER) Control High Voltage Power Supply

Few applications with electrorheological （ER） fluids have been found in industry. One reason is high voltage power supplies cannot meet the requirement for ER effect. In this paper, an ER control high voltage power supply for engineering application was designed which reduced power wastage by adopting soft switch technology; lessened its volume to satisfy micromation when adopting the planar transformer and improved its response character- istic by choosing an assistant discharging circuit. Simultaneously, a simulation analysis has been carried out. As results, the output voltage of this high voltage power supply is 5 kV, and the voltage can be continuously regulated and the voltage ripple is only 0. 7 %, so the requirement of stability is also achieved.

Research Advances in Mechanization of Pesticide Spraying Technology for Facility Agriculture

Firstly,this paper introduced the special requirements of pesticide application technical equipment for the facility agriculture. Secondly,it analyzed domestic situation of pesticide application technical equipment for the facility agriculture. Then,it discussed existing controlled droplet pesticide sprayer from operating principle,structural characteristics,and innovation points,and pointed out existing research findings and future research modules of the controlled droplet pesticide sprayer. Finally,in line with main research points and development direction of controlled droplet pesticide sprayer for the facility agriculture,it came up with pertinent recommendations and measures. It is intended to provide references for the application and development of pesticide application technical equipment for the facility agriculture in China.

新形势下疾病预防控制信息化需求及应用场景分析

目的/意义探讨新兴信息技术催生的疾病预防控制信息化新需求、新场景,为信息技术与疾病预防控制体系现代化建设深度融合提供参考。方法/过程分析新兴信息技术在电子病历与疾病报告智能化解析、区域症候群监测、大规模疾病排查与辅助流行病学调查、多渠道监测预警、卫生应急状态下便携式单兵通信等多方面的探索性应用,阐释尚未形成体系的原因。结果/结论提出未来现代化疾病预防控制信息化发展建议,为提升公共卫生服务能力、创新业务变革提供技术支撑。

“光储直柔”建筑配电系统应用研究

以某项目为例分析“光储直柔”在建筑物中的应用,并对“光储直柔”系统的应用场景、建筑直流配电系统的关注点及“光储直柔”系统关键设备进行阐述。

规模化养鸡场鸡粪“两段式”好氧堆肥工艺研究

好氧堆肥是鸡粪资源化利用的重要途径,它不仅能够解决鸡粪污染问题,还能够产生有机肥用于土壤改良,增强土壤肥力。但在工程应用上,传统的槽式堆肥发酵周期长,而罐式堆肥又常因物料含水率过高而难以启动,发酵效果不甚理想。本研究设计了一种“两段式”好氧堆肥工艺,通过初级发酵槽(第一阶段)发酵降低了物料含水率,从而实现了物料在立式发酵罐(第二阶段)内的快速腐熟。应用该工艺的示范工程已完成建设并稳定运行,对发酵完成后的物料进行腐熟度评价,发现物料的pH、含水率、有机质、蛔虫卵死亡率、种子发芽指数等评价指标均已满足要求,可作为肥料使用。

人工智能对企业收入分配的非线性影响——基于2007—2022年上市公司数据的检验

人工智能带来的新的技术变革促使企业收入分配格局发生变化。基于2007—2022年沪深A股上市公司数据,通过文本分析法对人工智能技术和应用进行科学测算,并就人工智能对企业利润与工资之间收入分配的影响展开分析。研究发现:人工智能技术和应用对企业利润与工资收入分配的影响呈“U”型,即在人工智能技术和应用发展的早期,利润与工资比率不断下降,差距逐渐缩小;但当人工智能技术和应用超过阈值时,利润不断吞噬工资,导致二者之间差距逐渐扩大。该结论在经历了替换被解释变量、分时段检验、剔除直辖市样本等一系列稳健性检验后依然成立。机制分析发现,人工智能技术和应用能够通过就业规模效应、就业结构效应和生产率效应间接影响企业利润与工资之间的分配。进一步研究发现,财务柔性能够正向调节人工智能与利润和工资之间收入分配的“U”型关系,对于财务柔性较高的企业来说,人工智能技术和应用与企业内部分配效应的“U”型关系较为明显,说明人工智能技术和应用对财务柔性较高的企业分配效应的影响相对更大。研究为在人工智能加速发展背景下提高员工工资、抑制企业间资本和劳动差距扩大提供了重要的政策建议。

压电驱动在超精密加工领域的应用现状与发展趋势综述

超精密加工中,为实现微/纳米级的加工精度,必须提供更高精度的驱动装置和控制技术。压电驱动具有精度高、振动频率高、力密度高、响应快、无电磁干扰、能断电自锁和优良的环境适应性等优点,被广泛应用在超精密加工领域,已成为超精密加工技术中的一项核心关键技术。首先系统阐述了压电驱动技术的致动原理、分类和特点,对压电驱动的致动原理和发展现状进行了分析;然后从加工、定位和抑制振动3个方面介绍了压电驱动技术在超精密加工中的应用现状,最后对压电驱动技术的发展方向进行了讨论及展望。

数字孪生在农机装备远程操控的应用探讨

数字孪生是一种融合多种信息技术、促进虚拟与现实交互融合的先进理念。文章在深入探究数字孪生的概念与远程操控系统架构的基础上,阐述数字孪生在农机装备远程操控的实现路线,为提升农业机械化、自动化和智能化生产水平提供了新途径,为数字孪生赋能智慧农业和智能农机装备奠定理论基础。

可靠性强化试验在配电控制器中的应用研究

可靠性强化试验通过施加高于产品正常工作条件的应力,快速激发产品潜在缺陷,揭示产品在设计、生产、工艺、元器件、原材料和结构等方面的缺陷和不足,通过优化设计或改进工艺等,最终实现提高产品可靠性的目的。本文从可靠性强化试验技术出发,详细介绍了可靠性强化试验目的、方案、环境条件和试验流程的制定,并结合可靠性强化试验在配电控制器上的实际应用,对可靠性强化试验的实际开展过程、故障问题分析和解决方案等进行了重点论述,可为同类产品的可靠性试验应用研究提供参考。

智能化分布式指挥与控制建设及关键技术应用

为厘清智能化分布式指挥与控制体系的发展态势及其关键技术,基于系统工程思维,通过收集开源情报、整合体系架构与建设进展等方式,对美军典型案例进行深入研究。同时,对其在特定作战场景中的应用进行阐释。结果表明,面向未来大规模、快节奏、多样化的战争,美军通过构建联合战术网、布局无人控制平台、研发智能决策辅助系统的方式增强作战指挥与控制的智能性。通过具体案例分析可知,分布式指挥与控制的智能化主要依赖边缘云、人工智能、无人自主系统及先进网络通信等关键技术。

预制水产品加工技术研究进展

随着人们生活方式的转变以及对便捷生活的追求,预制菜行业快速发展,其中预制水产品因自身优势展现出其独有的竞争力。预制水产品行业的持续健康发展依赖于水产品加工技术在产品安全、营养保持和感官评价等方面的质量控制。该文对预制水产品的发展历程、概念及其分类进行概述,重点阐述了脱腥、预制加工、灭菌、包装及贮藏等加工技术在水产品预制加工中的应用,并对预制水产品的未来发展趋势进行展望。

南京地区饮用水“控垢”需求分析及适用技术探讨

自来水煮沸后饮用是我国居民重要的饮水习惯,而煮沸后的“水垢”问题给供水企业和用户造成困扰。研究结合南京地区水源水质特征、现有处理工艺及“水垢”控制需求,结合“水垢”的生成反应及影响因素,探究适用于低硬度饮用水的有效“水垢”控制方法。结果表明,南京地区水源水质整体较好,且水厂均设置了深度处理工艺,可以较好地保证供水水质安全,目前比较典型的是基于“水垢”的感官水质问题。改良型诱导结晶软化工艺对煮沸后“水垢”具有较好的控制作用,软化药剂投加量宜控制在10~20 mg,投加二氧化碳回调pH,处理出水煮沸后则完全没有“水垢”,沸后水的总硬度也没有降低,且多次煮沸也没有“水垢”生成,工艺总运行费用可控制在0.06元/m^(3)左右。

基于PROFIBUS-DP总线的冗余技术的实施策略

通过对油品罐区监控系统信息、功能、性能需求的分析，根据进一步提高可靠性的要求，建立了基于PROFIBUS现场总线的冗余技术、采用主从式分布式控制结构的油品罐区监控系统，设计了相应的数据处理和控制、实施策略。这套系统已投入生产，运行可靠，取得了很好的实效。