SOMWA

With the circulation of the chain (i) the magnetic field appears around of its espiras. To the measure that the chain (i) grows in direction to the maximum value, the magnetic field in espiras if expands. To if expanding, the magnetic field in movimen to you generated it in one of espiras cuts espira placed to the side. As Gussow (1985) apud Michael Faraday enunciated, induces one definitive tension in this espira cut by the magnetic field in movement. each espira of the bobbin induces an electric tension in espiras neighboring, being thus, the application of tension in a bobbin provokes the appearance of a magnetic field in expansion that generates in the proper bobbin a induced tension, and this phenomenon is called of self-induction.

The tension generated in the bobbin for self-induction has opposing polarity to the one of the tension that is applied to its terminals. Therefore it is called of contraeletromotriz force (they fcem), that is, when the key of the circuit is closed/on, a tension with one determined polarity is applied to the bobbin. The self-induction generates in the bobbin a induced tension (they fcem) of opposing polarity to the one of the applied tension. 2.3.Indutncia On the basis of the GUSSOW teachings (1985), CARLOS, CESAR and CHOUERI (1996), as the force against-eletromotriz (they fcem) exists only during the variation of the generated magnetic field in the bobbin, when this reaches the maximum value, the con-tra-eletromotriz force (they fcem) leaves to exist and the chain reaches its maximum value. The same phenomenon occurs when the key is off-open. The contraction of the field induces a force against-eletromotriz (they fcem) in the bobbin, being late the decrease of the chain. This capacity of if opposing to the variations of the chain are called of inductance, as the bobbins present inductance, them also are called inductors, these can have the most diverse forms and can also be seemed a transforming one.

However it is difficult not to find in an entrepreneur of small company some characteristic of an entrepreneur. According to Carland (Caland, 1992) what it varies is the degree of the trend entrepreneur of the individual. According to 3 9241 ISO, usability measure the efficiency, effectiveness and satisfaction with which using they can reach specific objectives in a particular environment. The system must disponibilizar the experienced users the operations of shortcut as: abbreviations, soft keys, double click in mouse, clear language and without codes to inform errors and to help the user to understand the problem. Alterations for a good Usability: To accurately present the information that the necessary user at the moment, nor more nor less;? The terminology of being based on the language of the user and not being guided to the system;? The system must show the dialogue elements and allow that the user makes its choices, without necessity to remember to a command a specific one;? A command or action must always have the same effect;? The same operation must be presented in the same localization;? The system must continuously inform the user on what it is making.

2.1. Heuristical of Jakob Nielsen Considered ‘ ‘ father of usabilidade’ ‘ , Jakob Nielsen divides the usability in five basic criteria: the intuitividade, the efficiency, the memorization, the error and the satisfaction. The Heuristical ones of Nielsen (Jakob Nielsen, scientist of the computation with Ph.D in man-machine interaction) describe properties that must occur in a Web system of high usability. Visibility of the state of the system? Compatibility of the system with the real world? Control and freedom of the user? Consistency and standards? Prevention of errors? Recognition instead of souvenir? Flexibility and efficiency of use? Aesthetic and design minimalista?

The public security would have to be a duty of the State, however, as knows e? we are informed the entire time for periodicals? the demand of crimes is very high in relation to a control of polices, nor always the time is enough it polices so that it can act. Therefore, some prevention can be made in condominiums to keep the safe families and tranquilas. Doormans must be intent and to know all the inhabitants is essential. To prevent to give information on the routine of the mulberry ones for who wants that it is, not to sleep during its expedient, not to be in the sidewalk of the side of it are washing the street or talking it would carry leaving it forsaken. It must be clearly that rendering of services they only can enter in the condominium by means of advance warning of inhabitants or I investigate of it and in predetermined schedules, in case that in contrast, its ticket must be barred.

How much to the inhabitants, they do not have to deliver keys of the apartment or vehicles to the employees of the building, to get references of house servants of confidence, to always keep the door of the locked apartment, when the mulberry one will be to travel is indicated that it informs I investigate to and I forbid it the entrance of strangers in its property. To be educated and always friendly with the picture of employees of the condominium also it collaborates. He is in the responsibility and I investigate and/or Caretaker, to always keep the addresses of brought up to date employees, to install and to make the basic equipment maintenance of security, to establish codes with inhabitants in case that these desire to inform that they are being hostages of the action of delinquents, not to allow that entregadores are they of food or other merchandises has access to the apartment, the inhabitant must go until the reception to remove the delivery. Moreover, he fits to the syndics to set in motion polices it in action case suspicion. Beyond the contribution between inhabitants and employees of a condominium, it is necessary that he has good equipment of security. Between the basic item they are: cameras of monitoring, intercoms, alarms, boxes with doors for orders, you cancel for the estacionamentos, locks and gates of good quality, buttons of emergency in strategical places for contact with police, walls with you surround electric and cabin for doormans of good quality. Beyond these equipment, it is recommendable that the green areas are in visible places and that the illumination is always perfect.

An eBook reader or digital reader is a device whose main function is to visualize electronic books. Its design emulates the traditional paper book, so it offers mobility, autonomy and high contrast. In general, any device with a screen and memory can play eBooks, such as computers, laptops, PDAs or tablet, but without the advantages of the technology of e-ink eBook reader, that offers effect paper, high contrast and low power consumption. Readers and electronic books strictly speaking eBook (also called e-book, e-book, e-book or ebook) is the digital version of a book, and eReader (also called e-reader, eBook reader, eBook reader, reader, digital book reader or digital reader) is the device that reproduces the content of the eBook. However, it is common to use the term eBook to refer both to the book and to the player. History of the readers of e-books after the first generation of electronic books fails, electronic book readers have evolved dramatically since Amazon launched the Kindle 2 eBook reader, whose popularity has led to numerous manufacturers have launched their models to the market in 2009.

The arrival of electronic ink technology electronic ink was key for the eBook received the final impetus, since resolved two serious problems of electronic book readers: reading comfort and autonomy. Basically, an electronic ink display works by a few areas with a black part and other white, showing one face or another depending on the current applied, thus generating the image and tonality. With electronic ink, view gets less tired by the lack of backlighting, gets high contrast and autonomy is very high, about 10,000 pages per charge, given that once rendered the image in the spheres eBook reader does not require energy, only consume when you change page. The disadvantages of electronic ink are slow to load a new page, the absence of color (the current panels are in black and white) and that needs light to read because they have no backlight. EBook formats there are many formats of electronic, free books and owners, with and without DRM, generic and native, so we will have to verify the supported formats prior to purchasing an eBook reader. Copyright in the electronic books some publishers, in its claim to protect against the possible loss of revenue by the copyright of their works, have jointly developed with technology companies such as Adobe and Microsoft, security systems called DRM (Digital Rights Management, digital rights management) intended to restrict the user’s freedom to choose the eBook reader or the date of reading, and can even delete already purchased books. Other publishers on the other hand, offer your eBooks without DRM, respecting the wishes and rights of the readers. In the practice, all the DRM systems implemented in the digital world have been defeated or circumvented by users.