Month: July 2012

The Internet

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Digital computer, derecursos Internet and an enormous variety are not more scientific fiction and had imposed its naescola presence; however, many professors resist to adhere to the innovations and vriasinstituies do not have financial conditions to materialize them in cotidianoescolar.' ' 1 One of the social groups that receives influence from the Internet, comcerteza, is the young that they see in this new space a place of search of informaesde fast form and cmoda. The use of the Internet for the young changed concepts ecriou others and the mutation process continues. Orkut, fotologs among others soos communication channels between the young. For the young a estreitaseparao between the real world and the virtual world exists. The impact of the Internet in the young comes being analyzed pelasuniversidades, for the sociologists, anthropologists and too much organized institutions. The Internet serves as space of entertainment leisure? Of study? Of search deinformao? Of systemize knowledge? At last it functions with a vestibule that dacesso to the world either it digitalizado either it real world? The Internet I produce impact exactly in young of different social classes? the access it democratizado to all the young. They are questionings that they see being searched and analyzed pelosestudiosos.

A research carried through in the European countries with young of 12 the 18 years brought pertinent algumasrevelaes on the subject. ' ' The research foirealizada in Belgium, France, Spain, Italy, Portugal, Switzerland and in the Qubec, with one shows of 3326 adolescents, for on centers depesquisa the University or to the Ministry of Education. 2 ' ' The cited research looked for to namely focus the paper of the navida Internet of the young approaching three dimensions: ' ' the representations (aimagem that jovemfaz of the Internet), autilizao, that is, the real conditions of use in data period, and asapropriaes, what it consists, namely, the degree and the type of integration dInternet in the practical habits of life and daily of the young and its family egrupo of pares.' ' 3 In accordance with this research ainternet not cause a different impact of what nosjovens of years 60 was caused by the use of the TV.

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PLC compared with

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PLC compared with other PLC’s control systems are adapted for a wide range of automation tasks. These are typical industrial processes in manufacturing where the cost of developing and maintaining an automation system is relatively high against the cost of automation, and where they will be changes in the system throughout its operational life. The PLC contains everything needed to handle high power loads, requiring little electrical design and the design problem centers on expressing the operations and sequences in the ladder logic (or diagrams of functions). PLC applications are typically tailored to the system, so the cost of the PLC is low compared to the cost of hiring the designer to a specific design that will be used only once.On the other hand, in case of high production, control systems are amortized as themselves quickly due to savings in components, which causes that might be a good choice rather than a solution “generic”.However, it should be noted that some PLC no longer have a high price. The current PLC have all the capabilities for a few hundred dollars. Different techniques are used for high volume or a simple task automation, for example, a household washing machine can be controlled by an electromechanical cam timer costing some few dollars in production quantities. A microcontroller-based design may be appropriate where hundreds or thousands of units must be produced and then the development cost (design of power supplies and equipment inputs and outputs) can be divided into many sales where the end user does not have need to alter the control.Automotive applications are an example, millions of units are sold each year, and few end-users alter the programming of these controllers. (However, some specialty vehicles such as passenger trucks to urban transit using PLC drivers instead of our own design, because the volumes are small and development is not economic.) Some complex control processes, such as those used in the chemical industry, may require algorithms and features beyond the capacity of high-level PLC. High-speed controllers also require customized solutions, eg for aircraft controls. PLCs may include logic to implement loops analog “proportional, integral and derivative” or a PID controller. A PID loop could be used for temperature control of manufacturing processes, for example.Historically PLCs were usually configured with only a few analog control loops and where processes required hundreds or thousands of loops, a distributed control system (DCS) is responsible. However, PLCs have become more powerful, and the differences between between DCS and PLC applications has become less clear. In short, the areas of application of a PLC or PLC in industrial processes are when there is a confined space when production processes are changing periodically when there are sequential processes, where the processing machinery is variable, when the facilities are complex and comprehensive process, when the check is centralized programming in parts of the process. General Applications are: machine maneuver, maneuver and control facilities and signage.

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