C516 vertical lathe control circuit uses relay control method, which has disadvantages including large size, complex wiring, high failure rate, and maintenance difficulties. To solve these problems, designing a C516 v...
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ISBN:
(纸本)9783037852835
C516 vertical lathe control circuit uses relay control method, which has disadvantages including large size, complex wiring, high failure rate, and maintenance difficulties. To solve these problems, designing a C516 vertical lathe control circuit based on PLC,. Also describes the electronic requirements of the control circuits, basis of PLC selection, the hardware connection and software design. Practice has showed that the use of PLC control circuit is simple, reliable and highly improves the production efficiency.
Brucellosis is endemic among humans and ruminant in Egypt and recent reports suggest that its incidence may be increasing. In this study we describe the frequency of brucellosis among different ruminant species in Upp...
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Brucellosis is endemic among humans and ruminant in Egypt and recent reports suggest that its incidence may be increasing. In this study we describe the frequency of brucellosis among different ruminant species in Upper Egypt and its spatial distribution using the data generated by a large-scale control campaign undertaken between 2005 and 2008. A total of 120,090 individual animals of different ruminant species were tested during the campaign. The true proportions of brucellosis were estimated as 0.79% (Cl: 0.71%-0.87%), 0.13% (Cl: 0.08%-0.18%), 1.16% (1.05%-1.27%) and 0.44% (0.34%-0.54%) among cattle, buffaloes, sheep and goats respectively. We estimated that 0.2% (Cl: 0.16%-0.23%) of households in the study area keep at least one seropositive animal. Spatial autocorrelation of the proportions of seropositive households and seropositive animals was assessed using Global Univariate Moran's I and Local Univariate LISA. These analyses showed that the distribution of seropositive animals has considerable spatial heterogeneity with clustering in the northern governorates of the study area. Our results show that brucellosis is widespread and heterogeneously distributed in Upper Egypt. At the current level of available resources it is very unlikely that test and slaughter could be implemented with the intensity needed to be effective and other control measures that could replace or complement the test and slaughter policy in place should be considered. Also, this study illustrates some of the challenges faced by bilateral projects that have to accommodate an externally funded intervention with an ongoing national official disease control program. (C) 2011 Elsevier B.V. All rights reserved.
There is a disagreement on profits among the related parties of BUT mode transportation infrastructure construction. By analyzing the goals, beneficial points and resource conditions of both government and chief contr...
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ISBN:
(纸本)9781424473281
There is a disagreement on profits among the related parties of BUT mode transportation infrastructure construction. By analyzing the goals, beneficial points and resource conditions of both government and chief contractors, this paper proposed a Game-Equilibrium Model on BUT-mode transportation infrastructure construction concerned investing and financing economy, social benefits analysis and price-decision policy. As the conclusion, it puts forward a best corresponding programmed between the government and the contractors under a particular condition. It also gives us some theoretical support on policy-making among the related parties on transportation infrastructure construction.
For covering the real-time characteristics of an automation system during model-based design it is essential to model not only the function but also the behaviour of the control programs running on a real-time control...
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ISBN:
(纸本)9781424468508
For covering the real-time characteristics of an automation system during model-based design it is essential to model not only the function but also the behaviour of the control programs running on a real-time controller. This paper introduces an approach to the modelling and evaluation of the functional and time behaviour of programmable Logic controllers (PLC) on model level. The control algorithm consisting of UML statecharts is extended with an execution model of the controller which is also given as a statechart. The approach is integrated into a model-based design system for industrial control systems focusing on the field of production systems. An example will be employed to illustrate the benefits of a model-based design system which does incorporate real-time aspects of the controller.
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