PLC技术在工业控制中的应用前景

PLC控制技术由于集合了计算机技术、网络技术、数据通信技术以及自动化控制技术,实现了控制系统功能的改善,因而在工业控制领域得到了广泛的应用。文章针对PLC控制技术,首先概述了PLC控制技术的特点及其主要组成内容,进而分析了PLC控制技术的发展趋势,可以为相关人员熟悉了解PLC控制技术提供科学的参考。     

PLC过程控制系统的分析与设计

以裂化催化剂成胶过程的PLC控制为例,详细分析了PLC过程控制系统的设计过程。包括分析控制要求、确定PLC的输入/输出设备、选择PLC、分配I/O点并设计PLC外围硬件线路、编写程序与控制系统的调试六个步骤。     

PLC在工业自动化控制中的应用

文章叙述了PLC的构成和功能以及分析了PLC在工业自动化控制中的应用，并就PLC在工业自动化控制应用的一些注意事项以及抗干扰设计进行了分析，有助于PLC在工业自动化控制领域的未来发展。     

PLC控制在电机变频调速系统中的应用

本文就是针对PLC控制的电机变频调速系统进行的分析,采用PLC来控制变频器调速,充分发挥可编程控制器的高可靠性、灵活性、通用性、扩展性等优点,通过PLC的开关量输入输出模块控制变频器的多功能输入端、实现对电机的多级调速。     

试析PLC控制系统的可靠性设计问题

可靠性是进行PLC控制系统设计时的非常重要的要求,在PLC控制系统获得广泛应用的今天,PLC控制系统的可靠性设计更加重要。文章主要分析了影响PLC控制系统可靠性的若干因素,并重点论述了PLC控制系统的可靠性设计问题。     

PLC控制系统故障的维修方法分析

故障自诊断是PLC控制系统维护设计的重要内容,直接关系着该系统的稳定性和安全性。对于一个完善的PLC控制程序来说,大约有33%的程序是安全的、可靠的。而PLC控制系统的故障非常复杂,且比较抽象,为了准确诊断PLC控制系统的故障,需要完善故障诊断程序设计,从而快速、准确地排除故障。本文将对PLC控制系统故障的维修方法进行分析。     

试析PLC控制系统的可靠性设计问题

可靠性是进行PLC控制系统设计时的非常重要的要求,在PLC控制系统获得广泛应用的今天,PLC控制系统的可靠性设计更加重要。文章主要分析了影响PLC控制系统可靠性的若干因素,并重点论述了PLC控制系统的可靠性设计问题。     

PLC控制系统设计方法分析

PLC控制系统具备抗干扰能力强、可靠性强、耗能低、体积小等多方面的优点,因此被普遍用于我国的工业生产中。本文探讨分析了PLC控制系统设计的方法,并阐述了PLC控制系统的设计步骤和选择类型,从而证明在我国工业生产中PLC控制系统占有优异的地位。     

产品开发中软PLC的实现探讨

文章首先介绍了PLC的概念、功能特点和具有PLC功能的产品优势,接着分析了硬PLC和软PLC的区别,最后从PLC绘图工具的制作、PLC各种文件的生成、PLC语句表文件的编译和存储数据结构、PLC文件的运行机制、程序分类和运行控制等方面描述了在产品开发中软PLC的实现过程。     

PLC工程应用分析

文章针对PLC工程应用开发过程中的使用特点,研究了PLC硬件组成、软件结构,分析了PLC控制使用的工作过程,最后探讨了PLC编程语言语句,对PLC在控制系统的应用有一定指导意义。     

电子音乐流派的社会变革(英文)

从社会和政治变化、电子音乐流派的发展,形成了电子音乐,科学和技术的发展对电子音乐有重大的影响。他们是四个不同历史时期的发展——未来派,法西斯主义,达达派、电子音乐的时期。从最早使用:麦架,嘘声,窃窃私语,爆炸等。音乐和表达感情的表现,在阶级斗争,政治变革和经济危机、发展迅速的电子音乐,用在许多不同的零件,例如播放音乐、电影、电视等,都成了一个必不可少的组成部分的音乐市场。     

浅谈接触网软横跨工程施工技术优化与应用

本文主要通过接触网软横跨工程传统的施工技术的进行分析、试验、对比优化改进,通过测量、数据采集、计算、预制及安装调试等步骤分析、总结,创新和完善了软横跨施工技术。充分的证实了软横跨优化创新后的施工技术,在接触网工程施工过程中起到了一次到位良好的效果,缩短工期,避免了重复用工,提高了工效,在今后中国电气化铁路接触网新建、大修、扩建及改建工程中具有很强的推广意义。     

论医院固定资产管理存在的问题及对策

就目前的社会经济而言,国家拨给医院的资金是很有限的,而正是因为这样,医院更应该在面对经费不足的时候,计划好开源节流,管理好现有的固定资产,并优化资源,努力提高社会效益以及经济效益。本文简单地探讨目前医院固定资产管理中存在的问题以及对策。     

公路工程施工组织设计探析

近些年,国家对基础性建设的投入越来越大,我们的公路建设也日益增多。公路工程是一项综合性、系统性较强的工程,是集路基、路面、路线、桥涵、隧道等于一体的综合体系。随着经济社会的发展和施工工艺的不断进步,人们对公路工程的要求也更加严格。为了保证公路建设的正常施工,就需要工程设计按时按量完成。而如何处理好质量与工期的矛盾则是公路设计者面临的难题。本文对公路工程设计的重要性,步骤等进行一个分析研究。     

Towards a Theory of Serendipity: A Systematic Review and Conceptualization

Serendipity – the notion of making surprising and valuable discoveries – plays a major role in the success of individuals and organizations alike. Previous research has established the importance of serendipity and identified important individual- and organizational-level antecedents. However, the literature has been dispersed and the boundaries of the concept have been blurry, leading to a lack of conceptual clarity and structure, and thus limiting validity and managerial actionability. Based on a systematic literature review, I synthesize existing management-related research on serendipity and explicate the emergence and composition of serendipity in the organizational context. I first identify three necessary conditions that differentiate serendipity from related concepts such as luck or targeted innovation: agency, surprise, and value. Then, I draw from the literature on sensemaking, event-based theorizing, and quantum-based approaches to management to conceptualize the process of cultivating serendipity in the organizational context as a process of enabling potentiality and materialization, and develop a multi-level theory of (cultivating) serendipity. This conceptualization contributes to our collective understanding of how, why, and when (i.e., under what conditions) organizations can leverage the value in the unexpected, which opens up fruitful avenues for further research.     

The Geography of Innovation in China and India

The BRICS countries in general, and China and India in particular, are now widely regarded as the areas of the world likely to challenge the economic leadership of the United States (US) and the European Union (EU). A large part of this challenge will come from rapid technological catch‐up by China and India. Yet, despite a recent rise in interest, there is limited knowledge about how and where innovation takes place in these two leading emerging countries and to what extent the Chinese and Indian territorial systems of innovation differ from those in the EU or the US. In this article we explore the geography of innovation in China and India, concentrating on understanding key territorial‐level innovation trends by country, region and technology field, using the US and the EU as benchmarks. We find significant contrasts between the geography of innovation in China and India and that of the US and the EU. First, the degree of concentration of innovative activities in both countries is extremely high. Levels of agglomeration of innovation in the coastal provinces of China, as well as in Delhi and the South of India, significantly exceed the levels of agglomeration found in the USA and the EU. Secondly, China has witnessed a more rapid increase in the degree of concentration of innovation than India. We posit that the differences in the geography of innovation between, on the one hand, China and India and, on the other hand, between these countries and the developed world are rooted in different institutional settings, different systems of innovation and different national innovation strategies.     

企业专业化、标准化、集约化与信息化统筹建设方略

在国内外,很多优秀企业从愿景和价值观出发,通过工作流程对其进行分解并实现公司标准管理体系,通过管理信息化建设将工作流程加以实施,最终实现企业专业化、标准化、集约化工作流程固化和与之匹配的管理信息化平台。文章从专业化、标准化、集约化与信息化实现之间的关联分析出发,以实现专业化、标准化、集约化统筹规划运作与公司管理信息化系统软件实现为思路,以解决长期提升公司管理运作效率为宗旨,对统筹企业专业化、标准化、集约化与信息化建设进行探讨。     

WHAT'S TO KNOW ABOUT THE CREDIBILITY OF EMPIRICAL ECONOMICS?

The scientific credibility of economics is itself a scientific question that can be addressed with both theoretical speculations and empirical data. In this review, we examine the major parameters that are expected to affect the credibility of empirical economics: sample size, magnitude of pursued effects, number and pre‐selection of tested relationships, flexibility and lack of standardization in designs, definitions, outcomes and analyses, financial and other interests and prejudices, and the multiplicity and fragmentation of efforts. We summarize and discuss the empirical evidence on the lack of a robust reproducibility culture in economics and business research, the prevalence of potential publication and other selective reporting biases, and other failures and biases in the market of scientific information. Overall, the credibility of the economics literature is likely to be modest or even low.     

文化与科技融合的实现路径

文化发展与科技创新两者交织融合,科技创新是文化发展的重要引擎,文化发展也成为科技创新的引领。文化与科技融合本质是由科技突破和技术创新所带来文化产业在生产方式、消费方式、产业形态和产业结构等方面的变革,融合的核心是价值链重构,融合广泛发生在产业、市场、企业和生产要素等领域。目前,我国文化与科技的融合相对滞后,发展压力与发展机遇并存。从路径上来说,可从产业、市场、企业和人才四个方面实现文化与科技的融合。     

Engineering Cities: Mediating Materialities,Infrastructural Imaginaries and Shifting Regimes of Urban Expertise

This symposium opens up new critical insights and analytical perspectives into the relationships between power, politics, materiality and urban engineering. In so doing it demonstrates the central role of engineers in the production and negotiation of everyday life in the city. In contrast to the technocratic exercise engineering often professes to be, the contributors to this symposium argue that the assembling and choreography of cities through the myriad techniques, routines, standards and visions of engineers is inextricably bound up with broader socio‐cultural, material and political urban dynamics and processes. This necessitates investigating the multiple and competing social imaginations, forms of knowledge and regimes of expertise associated with urban engineering. The symposium's five articles, straddling disciplinary backgrounds in geography, anthropology, engineering and history, focus analytical and empirical attention on the figure of the engineer and on the work of engineering in the cities of Paris, Mumbai, Singapore and London. Engineering, we suggest, is a diagnostic for probing the shifting forms of mediation that animate and inhabit contemporary dynamics of urban change. The symposium thus opens up a new avenue for cross‐disciplinary and transregional research for urban studies while also suggesting innovative ways of conceptualizing urban transformation and contestation.