dilate 发表于 2025-3-21 19:34:11
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Magnetic Quantities, Units, Materials, and Measurements,inology. Thus we will use the term “magnetic field” as a generic term relating to a particular class of phenomena that exists or is evidenced throughout some region of space. Hence the use of the word “field.” Two of the most-used quantitative attributes of the magnetic field, to be dealt with later催眠 发表于 2025-3-22 01:22:12
Cryogenics,d several specific reasons. The general reason is that the sensitivity of sensors of all kinds, including magnetic sensors, are inherently limited by equilibrium thermodynamic fluctuations (commonly called “thermal fluctuations,” or in some contexts “Nyquist noise”) of whatever mechanism is involved善于骗人 发表于 2025-3-22 07:01:44
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Detection Coils,ea where there are disturbing fields which are orders of magnitude stronger than those to be detected. Hence, it is necessary not only to use a sufficiently sensitive detector — and SQUIDs are adequate for most tasks — but also to reduce the detected ambient noise below that of the sensor. This goal多骨 发表于 2025-3-22 16:17:50
Physical Concepts and Mathematical Models,biomagnetic field may be used to reveal information concerning biological sources. To unlock this information entails a somewhat lengthy chain of reasoning beginning with some careful definitions and proceeding by certain well-established physical laws to calculate the actual magnetic fields produceArmada 发表于 2025-3-22 17:49:41
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Cardiac Studies,lay a role, such as improved medical services, advances in surgical and medical treatment, improved control of blood pressure, dietary change, and other alterations of life style (Levy and Moskowitz 1982). Certainly, research into the nature and causes of diseases in this classification has returnedaffinity 发表于 2025-3-23 07:21:31
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