Xem 1-20 trên 487 kết quả The electromagnetic
  • Tham khảo sách 'the new astronomy: opening the electromagnetic window and expanding ou', khoa học tự nhiên, vật lý phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • 1.1 Induction experiment: Inside the shaded region, there is a magnetic field into the board. – If the loop is stationary, the Lorentz force (on the electrons in the wire) predicts: (a) A Clockwise Current; (b) A Counterclockwise Current; (c) No Current Now the loop is pulled to the right at a velocity v. – The Lorentz force will now give rise to:

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  • Communication happens in the form of signals. Signals are transmission of energy (mechanical, electrical or light) through appropriate media. A signal that is constant and changed once conveys single information. The more changes in the signal, the more information that the signal can convey. For example, a push can mean one thing and removing it can mean another thing.

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  • We have known the close connection between changing eletric fields and magnetic fields. They can create each other and form a system of electromagnetic fields.  Electromagnetic fields can propagate in the space (vacuum or material environment). We call them electromagnetic waves. They play a very important role in science and technology.

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  • The wireless era was started by two European scientists, James Clerk Maxwell and Heinrich Rudolf Hertz. In 1864, Maxwell presented Maxwell's equations by unifying the works of Lorentz, Faraday, Ampere, and Gauss. He predicted the propagation of electromagnetic waves in free space at the speed of light. He postulated that light was an electromagnetic phenomenon of a particular wavelength and predicted that radiation would occur at other wavelengths as well. His theory was not well accepted until 20 years later, after Hertz validated the electromagnetic wave (wireless) propagation.

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  • This volume, derived from the Handbook of Engineering Electromagnetics (2004), is intended as a desk reference for the fundamentals of engineering electromagnetics. Because electromagnetics provides the underpinnings for many technological fields such as wireless communications, fiber optics, microwave engineering, radar, electromagnetic compatibility, material science, and biomedicine, there is a great deal of interest and need for training in the concepts of engineering electromagnetics.

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  • In this chapter, we present in a nutshell the fundamental aspects of engineering electromagnetics from the view of looking back in a reflective fashion at what has already been learned in undergraduate electromagnetics courses as a novice. The first question that electromagnetics.

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  • Any electromagnetic phenomenon capable of impairing the performance of a device, equipment or system, etc. An electromagnetic disturbance can be electromagnetic noise, an unwanted signal or a change in the propagation medium itself.

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  • The study of electromagnetic radiation (EM) can be divided into two distinct areas: full solution of Maxwell's Equations relevant to the specific boundary conditions in a special general case and into application of EM radiation that results in modern life e.g. medicine, telecommunication, electromagnetic compatibility (EMC) etc. The reader should have a specific scientific background and must be familiar with the fundamental ideas of EM theory for the first area. Basic understanding of applying the radiation techniques in modern life is needed for the second.

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  • A major topic in this book is the study of propagation and scattering of waves by randomly distributed particles. We first consider scattering by a single particle. This chapter and the next discuss and derive the scattering characteristics of a single particle. Both exact and solutions are studied. Scattering by a single ...

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  • The study of the formation and early evolution of stars has been an ever growing part of astrophysical research. Traditionally, often in the shadow of its big brothers (i.e., the study of stellar structure, stellar atmospheres and the structure of galaxies), it has become evident that early stellar evolution research contributes essentially to these classical fields. There are a few new items on the list of traditional astrophysical studies, some of which are more related to features known from the extreme late stages of stellar evolution.

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  • Undernutrition affects large populations of boys and girls in developing countries. Its major determinant is poverty, which usually combines with other important factors like poor breastfeeding practices and inadequate complementary foods for babies, as well as lack of basic health care, safe water and sanitation. Globally, about 150 million children under five years are undernourished, which comprises 27% of the world’s population in this age group. Twelve million of these children die every year, and protein-energy malnutrition is implicated in more than 55% of all these deaths.

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  • Among the branches of classical physics, electromagnetism is the domain which experiences the most spectacular development, both in its fundamental and practical aspects. The quantum corrections which generate non-linear terms of the standard Maxwell equations, their specific form in curved spaces, whose predictions can be confronted with the cosmic polarization rotation, or the topological model of electromagnetism, constructed with electromagnetic knots, are significant examples of recent theoretical developments. ...

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  • This is an unusual book, combining as it does papers on astrobiology, history of astronomy and sundials, but—after all—Woody Sullivan is an unusual man. In late 2003 I spent two fruitful and enjoyable months in the Astronomy Department at the University of Washington (UW) working on archival material accumulated over the decades by Woody, for a book we will co-author with Jessica Chapman on the early development of Australian astronomy.

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  • This is a companion volume to Electromagnetism for Electronic Engineers (3rd edn.) (Ventus, 2009). It contains the worked examples, together with worked solutions to the end of chapter examples, which featured in the previous edition of the book. I have discovered and corrected a number of mistakes in the previous edition.

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  • Copyright laws are increasingly passed without democratic debate or scrutiny. In Great Britain, where I live, Parliament recently passed the Digital Economy Act, a complex copy- right law that allows corporate giants to disconnect whole families from the Internet if any- one in the house is accused (without proof) of copyright infringement; it also creates a “Great Firewall of Britain” that is used to censor any site that record companies and movie studios don't like.

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  • Rapid response to emergencies includes the immediate shipment of supplies and equipment to help meet the minimum requirements in a crisis, such as enabling pregnant women to deliver in a clean environment. When the situation stabilizes, UNFPA provides support for the full range of reproductive health services. These services address the life-and-death complications of pregnancy and delivery, the transmission of sexually transmitted infections including HIV/AIDS, adolescent health, violence against women, and access to condoms and other contraceptives.

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  • The second essay follows the path of the relation between saturation and emptiness by making an inventory of saturated motifs: the sky, the explosion as well as different forms of vacuum: the wandering, neutralization of the place, anonymity of the subject, emptiness of the space, inform, anguish, breakdown, instability, boredom, indifference… Bonfand shows that in Antonioni’s cinema the vacuum works as an autonomous and omnipresent force which disintegrates the system of representation of the films until saturating the image in return.

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  • Light is just one portion of the various electromagnetic waves flying through space. The electromagnetic spectrum covers an extremely broad range, from radio waves with wavelengths of a meter or more, down to x-rays with wavelengths of less than a billionth of a meter. Optical radiation lies between radio waves and x-rays on the spectrum, exhibiting a unique mix of ray, wave, and quantum properties.

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  • Results from the univariate analysis of prostate cancer mortality and incidence do not take into account the effect of different covariables, which might influence the SMR and SIR. Various covariables where considered to model longitudinal effects: age, calendar year, year of immigration, length of stay in Germany; cohort was considered for the analysis of mortality. Multivariate Poisson regression did not show any significant effect of the considered covariables on mortality (data not shown).

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