Leading learning within a PLC : implementing new mathematics content

This paper does two things. Firstly, it examines the literature that coalesces around theoretical models of teacher professional development (PD) within a professional learning community (PLC). Secondly, these models are used to analyse support provided to two year 3 teachers, while implementing the draft Queensland mathematics syllabus. The findings from this study suggest that the development of this small PLC extended the teachers’ Zone of Enactment which in turn led to teacher action and reflection. This was demonstrated by the teachers leading their own learning as well as that of their students.

A Computational Module Assembled from Different Protease Family Motifs Identifies PI PLC from Bacillus cereus as a Putative Prolyl Peptidase with a Serine Protease Scaffold

Proteolytic enzymes have evolved several mechanisms to cleave peptide bonds. These distinct types have been systematically categorized in the MEROPS database. While a BLAST search on these proteases identifies homologous proteins, sequence alignment methods often fail to identify relationships arising from convergent evolution, exon shuffling, and modular reuse of catalytic units. We have previously established a computational method to detect functions in proteins based on the spatial and electrostatic properties of the catalytic residues (CLASP). CLASP identified a promiscuous serine protease scaffold in alkaline phosphatases (AP) and a scaffold recognizing a beta-lactam (imipenem) in a cold-active Vibrio AP. Subsequently, we defined a methodology to quantify promiscuous activities in a wide range of proteins. Here, we assemble a module which encapsulates the multifarious motifs used by protease families listed in the MEROPS database. Since APs and proteases are an integral component of outer membrane vesicles (OMV), we sought to query other OMV proteins, like phospholipase C (PLC), using this search module. Our analysis indicated that phosphoinositide-specific PLC from Bacillus cereus is a serine protease. This was validated by protease assays, mass spectrometry and by inhibition of the native phospholipase activity of PI-PLC by the well-known serine protease inhibitor AEBSF (IC50 = 0.018 mM). Edman degradation analysis linked the specificity of the protease activity to a proline in the amino terminal, suggesting that the PI-PLC is a prolyl peptidase. Thus, we propose a computational method of extending protein families based on the spatial and electrostatic congruence of active site residues.

Enhanced Operation of Electricity Distribution Grids Through Smart Metering PLC Network Monitoring, Analysis and Grid Conditioning

Low Voltage (LV) electricity distribution grid operations can be improved through a combination of new smart metering systems' capabilities based on real time Power Line Communications (PLC) and LV grid topology mapping. This paper presents two novel contributions. The first one is a new methodology developed for smart metering PLC network monitoring and analysis. It can be used to obtain relevant information from the grid, thus adding value to existing smart metering deployments and facilitating utility operational activities. A second contribution describes grid conditioning used to obtain LV feeder and phase identification of all connected smart electric meters. Real time availability of such information may help utilities with grid planning, fault location and a more accurate point of supply management.

应用于PLC控制程序的Petri网执行模型

在现有的工业控制系统中经常使用PLC实现顺序控制、定时等功能.控制程序经常需要执行同步操作且输入开关量的触发时机具有不确定性,因此无法充分描述真实的执行过程.为此提出下述解决方法:首先在控制程序的编译阶段,使用Petri网建立网模型以表示程序执行逻辑,其次在控制程序的执行阶段,根据程序真实执行状况动态运行上述网模型,当程序运行结束时网模型停止执行,由此判断程序中存在的逻辑错误.

¿Cómo diseñar un PLC para la escuela plurilingüe?

Nivel educativo: Grado. Duración (en horas): De 21 a 30 horas

Del diseño a la programación de sistemas de control para la automatización de procesos industriales basados en PLC`s

Actualmente las mayoría de sistemas de automatización industrial utilizan los Autómatas Programables (PLC - Programmable Logic Controller) como sistemas de control y el diseño de dicho sistema se realiza mediante el lenguaje de modelado Grafcet. SFCEdit es un editor de Grafcet que permite el diseño de estos sistemas de control y la exportación de los mismos en un formato XML. Resumen Por otra parte tenemos la norma IEC 61131-3 que busca estandarizar los lenguajes de programación de los PLC de esta manera no se tendría que usar un lenguaje distinto por cada fabricante, y la organización PLCOpen rigiéndose por la norma ha creado un formato XML para cada lenguaje, en los cuales se basa el traductor. Resumen Habitualmente el paso del diseño a la programación se realiza de forma manual. La automatización de este proceso es el objetivo general del proyecto realizado. En esté se ha desarrollado una herramienta que permite realizar la traducción del diseño gráfico al estándar IEC 61131-3 considerando las particularidades de algunos fabricantes de PLCs como Beckhoff (TwinCAT) y TSX Micro (PL7Pro). Además la herramienta realiza la traducción al formato XML de PLCOpen. Resumen El traductor funciona recibiendo un fichero XML (exportado de SFCEdit) procesa su información y genera los ficheros en función de la compatibilidad que el usuario seleccione.

Fabrication of a novel silica PLC hybrid integrated triplexer

A new-style silica planar lightwave circuit (PLC) hybrid integrated triplexer, which can demultiplex 1490-nm download data and 1550-nm download analog signals, as well as transmit 1310-nm upload data, is presented. It combines SiO2 arrayed waveguide gratings (AWGs) with integrated photodetectors (PDs) and a high performance laser diode (LD). The SiO2 AWGs realize the three-wavelength coarse wavelength-division multiplexing (CWDM). The crosstalk is less than 40 dB between the 1490- and 1550-nm channels, and less than 45 dB between 1310- and 1490- or 1550-nm channels. For the static performances of the integrated triplexer, its upload output power is 0.4 mW, and the download output photo-generated current is 76 A. In the small-signal measurement, the upstream 3-dB bandwidth of the triplexer is 4 GHz, while the downstream 3-dB bandwidths of both the analog and digital sections reach 1.9 GHz.

基于PLC及触摸屏的发射机控制系统设计

根据远程控制高频发射机和简化设计的要求,设计了一种基于PLC和触摸屏的高频发射机控制系统。并结合ProfiBus总线和Ethernet技术,实现了与原有系统的组网。采用STEP7、Wincc和Protool分别完成PLC程序设计、上位机人机界面和触摸屏人机界面设计。重点介绍了系统的硬件配置、网络结构、频率微调、人机界面、软件设计。该系统设计简化了网络结构,提高了可靠性和稳定性。

基于PLC及Ethernet的发射机控制系统改造

根据高频发射机远程控制的要求,设计了一种基于工业以太网和PLC的高频发射机远程控制系统,采用STEP7和Wincc分别进行PLC程序设计和上位机人机界面设计。重点介绍了系统的硬件配置、网络结构、频率微调、软件设计和系统功能。该系统设计简化了网络结构,提高了系统的可靠性和稳定性。

PLC在工业用电子加速器安全系统中的应用

重点介绍了可编程控制器 (PLC)在工业用电子加速器安全系统中的应用 ,先进的硬件技术和优化的软件设计使整个系统的可靠性、可扩充性及可维护性都得到加强。

PLC在HIRFL电源控制保护中的应用

用 PLC实现的电源控制保护 ,在负载故障、本机停水、快熔熔断、母线过热、过电压、过电流、调整管越限故障方面实现了电源的可靠保护。克服了传统保护方式中控制系统繁琐、继电器多等带来的保护和控制的不可靠性

PLC在电子加速器控制系统中的应用

全面介绍了一个基于可编程控制器的工业用电子加速器控制系统。它的计算机控制系统采用可编程控制器 (PLC)作为核心设备 ,先进的硬件技术和优化的软件设计使整个系统的可靠性、可扩充性和可维护性都大大地加强

基于PLC的电子加速器安全控制系统

本文主要介绍了我在中科院近物所电子辐照室所研制的大功率电子加速器计算机控制系统方面的工作。文章在简要介绍了加速器的研制背景，该加速器的结构特点和工作原理后，主要叙述了基于可编程控制器（PLC）的加速器计算机控制系统的设计思想、硬件设备的特点和软件系统的组成。集散型计算机控制系统（DCS）硬件和软件的设计内容以及所能实现的控制功能是本文的重点。经过全组人员的共同努力，计算机控制系统已投入使用。并于2000年11月成功地调试出束流。从目前情况来看，加速器计算机控制系统运行正常，取得了满意的效果。