By K.H.J. Buschow Ph.D.
Magnetic and superconducting fabrics pervade each road of the technological global - from microelectronics and mass-data garage to drugs and heavy engineering. either components have skilled a up to date revitalisation of curiosity a result of discovery of recent fabrics, and the second look of quite a lot of easy mechanisms and phenomena. This Concise Encyclopedia attracts its fabric from the award-winning Encyclopedia of fabrics and Engineering , and comprises updates and revisions now not to be had within the unique set -- making it definitely the right reference significant other for fabrics scientists and engineers with an curiosity in magnetic and superconducting fabrics. * includes in way over a hundred thirty articles, taken from the award-winning Encyclopedia of fabrics: technology and know-how , together with ScienceDirect updates no longer on hand within the unique set. * each one article discusses one point of magnetic and superconducting fabrics and comprises photos, line drawings and tables to help the knowledge of the subject handy. * Cross-referencing publications readers to articles protecting topics of similar curiosity.
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As different reviewers have acknowledged, this can be a nice reference for EMC concerns, and that i wholeheartedly agree. As an analog
engineer, although, i locate it super worthy for analog layout, too. it is not brilliant that such a lot of respected
analog designers seek advice from Henry Ott's work.
Anyone concerned about the layout of mixed-signal (analog and electronic) published circuit forums will discover a goldmine
of details within the bankruptcy protecting this subject (Chapter 17: Mixed-Signal PCB Layout). the reason for utilizing or now not utilizing break up floor planes is obviously defined, and it truly is most likely that many designers, together with this reviewer, were doing it improperly and growing noisier PCBs that bring about noisier analog signs. regularly, it's greater to not break up the floor aircraft, yet elements placement is the most important. This bankruptcy on my own is well worth the fee of the book.
Chapter four: Balancing and Filtering completely covers the subject of balanced circuits and contains the whole sign chain: the motive force, the cable, and the receiver (both transformer-input and op-amp-input based). a person operating with low-level analog indications (audio engineers, instrumentation engineers) will locate this bankruptcy very precious. additionally of significant price is the bankruptcy on cabling (Ch. 2). It truly explains how and less than what conditions cable defensive works to protect opposed to electrical and magnetic interference, and the diversities among coaxial cable and twisted pair connections. As an engineer operating within the audio box, it is a definitive reference for studying the functionality of single-ended (coax) and balanced ("XLR") audio connections,
including the themes of floor loops and the way and the place to flooring the safeguard of a cable (as is laid out in the Audio Engineering Society's ordinary addressing this, AES48, 2005).
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Also, the publication is a brilliant reference for lots of analog engineering issues like calculating the noise in a resistor or op-amp circuit, the diversities among excellent and real-world passive parts, and so forth. The booklet has turn into a widespread reference for a number of engineering matters, not only EMC.
Getting again to EMC, bankruptcy 18: Precompliance EMC Measurements -- one other very good instance of Henry Ott's skill to supply transparent, concise, sensible details to the operating engineer -- has quite a few examples of easy, common EMC exams that may be played in a improvement lab, with low-cost try out gear. certainly, you are going to shop a visit or (or extra! ) to a pricey EMC try out facility if you happen to use those how you can realize your product's troublesome areas and attach them ahead of going to a qualified EMC try out website. on the topic of this bankruptcy is Appendix B: the 10 most sensible how you can MAXIMIZE the Emission out of your Product. it is a speedy and exciting learn, yet is full of info for the fashion designer to spot the components and blunders potentially to reason EMC issues of a layout. those 3 appendix pages could be learn through every person concerned with a undertaking -- electric engineers, mechanical engineers, and undertaking managers -- to ensure those mistakes do not make their means into the design.
A well-written and immensely valuable ebook, it's very deserving of the 2009 organization of yankee Publishers award it obtained.
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Extra info for Concise Encyclopedia of Magnetic and Superconducting Materials
For this reason only this type will be discussed below. A more detailed description of both types of hard ferrites can be found in the review by Buschow (1997). ) Alnico magnets are composed of iron, cobalt, nickel, aluminum, and various types of additives. These are magnets of metallic character obtained by casting. One of the advantages of alnico alloys is that the melting can be performed in air, although sometimes an apron of inert gas is blown over the melt. Alnico alloys can also be prepared by sintering powders of the raw materials, aluminum being always added in the form of a prealloy with one or more of the other constituent metals.
Moreover, the mechanisms responsible for anisotropy formation also control the thermal aging of the material. Hence, good thermal stability of the magnetic properties requires a possibly high activation energy and slow kinetics of anisotropy formation. Finally, both amorphous and nanocrystalline alloys generally reveal low losses and a high permeability even at elevated frequencies up to several hundred kilohertz. The favorable high-frequency behavior, comparable to or even better than in Mn–Zn ferrites (see Ferrites), is essentially related (i) to the thin ribbon gauge of dE20 mm inherent to the production technique, and (ii) to a relatively high electrical resistivity of typically rE100–130 mO cm, which both reduce eddy current losses.
Instead magnetization reversal can occur by a complex incoherent mechanism known as ‘‘curling’’ (McCurrie 1982). It can proceed in lower ﬁelds, which accounts for the lower observed coercivities. The various grades of alnico-type alloys are usually referred to by plain numbers, as indicated in the ﬁrst column of Table 1. More details of the preparation and second quadrant characteristics of these and other alnico-type permanent magnet materials can be found in the review of McCaig and Clegg (1987).
Concise Encyclopedia of Magnetic and Superconducting Materials by K.H.J. Buschow Ph.D.