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電磁學應用（一）：電磁學在校園生活中的應用

發布時間：

2021-04-21

深圳市宗泰電機有限公司作爲電磁動力源解決方案提供商，對所有能改善人們生活的電磁學應用領域都非常感興趣，我們生産的電磁鐵電磁閥对生活自动化、工业自动化和办公自动化作出了巨大贡献，下面，就让我们来看看电磁学在校园生活中的应用吧。

學生們在學校生活使用貨幣購買東西是不可避免的事情，但是在身上帶著大量的現金既占地方又不安全，同時，在購買東西的過程中經常會出現找零的情況，這也給學生帶來一些麻煩。爲了改善這一現象，校園一卡通應運而生。

電磁學應用（一）：電磁學在校園生活中的應用

除了校園一卡通外，我們平時使用的IC卡，商場購物卡等等，也是同樣的原理。

電磁學應用（一）：電磁學在校園生活中的應用

校园一卡通是电磁学完美应用的重要体现, 它的内部是一个非接触式IC卡, 这种IC卡采用射频识别技术, 也就是在IC卡的内部装有一个感应圈和一个集成电路芯片,?

電磁學應用（一）：電磁學在校園生活中的應用

但是爲了IC卡能夠正常工作，需要一個外部讀卡器，也就是我們所知道的刷卡機。讀卡器最主要的作用是它會發出與IC卡固有頻率相同的脈沖，當校園卡靠近讀卡器時就會産生電磁，進而感應圈産生共振，促使芯片工作。

電磁學應用（一）：電磁學在校園生活中的應用

我們生産的多款小型電磁鐵就是應用在讀卡器上的，利用電磁學原理，通電時，線圈産生磁力驅動金屬推杆運動，促發指令，斷電時，線圈磁力消失，金屬推杆靠彈簧回位，結束指令。

電磁學應用（一）：電磁學在校園生活中的應用

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A paralysed woman who had also been flung into the street was nursed at the hospital, and lay with many others in the chapel of the Institution, which had been turned into a ward. After the formal and material elements of life have been separately discussed, there comes an account of the process by which they are first brought into connexion, for this is how Aristotle views generation. With him it is the information of matter by psychic force; and his notions about the part which each parent plays in the production of a new being are vitiated throughout by this mistaken assumption. Nevertheless his treatise on the subject is, for its time, one of the most wonderful works ever written, and, as we are told on good authority,257 is now less antiquated than the corresponding researches of Harvey. The philosopher’s peculiar genius for observation, analysis, and comparison will partly account for his success; but, if we mistake not, there is another and less obvious reason. Here the fatal separation of form and matter was, except at first starting, precluded by the very idea of generation; and the teleological principle of spontaneous efforts to realise a predetermined end was, as it happened, perfectly in accordance with the facts themselves. It was a consequence of the principle just stated that in formal logic the Stoics should give precedence to the hypothetical over the categorical syllogism.40 From one point of view their preference for this mode of stating an argument was an advance on the method of Aristotle, whose reasonings, if explicitly set out, would have assumed the form of disjunctive syllogisms. From another point of view it was a return to the older dialectics of Socrates and Plato, who always looked on their major premises as possessing only a conditional validity—conditional, that is to say, on the consent of their interlocutor. We have further to note that both the disjunctive and the hypothetical syllogism were first recognised as such by the Stoics; a discovery connected with the feature which most profoundly distinguishes their logic from Aristotle’s logic. We showed, in dealing with the latter, that it is based on an analysis of the concept, and that all its imperfections are due to that single circumstance. It was the Stoics who first brought judgment, so fatally neglected by the author of the Analytics, into proper prominence. Having once grasped propositions as the beginning and end of reasoning, they naturally and under the guidance of common language, passed from simple to complex assertions, and immediately detected the arguments to which these latter serve as a foundation. And if we proceed to ask why they were more interested in judgment than in conception, we shall probably find the explanation to be that their17 philosophy had its root in the ethical and practical interests which involve a continual process of injunction and belief, that is to say, a continual association of such disparate notions as an impression and an action; while the Aristotelian philosophy, being ultimately derived from early Greek thought, had for its leading principle the circumscription of external objects and their representation under the form of a classified series. Thus the naturalistic system, starting with the application of scientific ideas to human life, ultimately carried back into science the vital idea of Law; that is, of fixed relations subsisting between disparate phenomena. And this in turn led to the reinterpretation of knowledge as the subsumption of less general under more general relations. 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