Balance electromagnetic

In a thermogravimetric analysis, the sample is placed in a small weighing boat attached to one arm of a specially designed electromagnetic balance and placed inside an electric furnace. The temperature of the electric furnace is slowly increased at a fixed rate of a few degrees per minute, and the sample s weight is monitored. 

Precision Scales and Balances. These products today rely predominantly on electromagnetic force compensation (EMFC) technology. 

Dyestuff organic chemistry is concerned with designing molecules that can selectively absorb visible electromagnetic radiation and have affinity for the specified fiber, and balancing these requirements to achieve optimum performance. To be colored the dyestuff molecule must contain unsaturated chromophore groups, such as a2o, nitro, nitroso, carbonyl, etc. In addition, the molecule can contain auxochromes, groups that supplement the chromophore. Typical auxochromes are amino, substituted amino, hydroxyl, sulfonic, and carboxyl groups. 

The noncontact measurement principle, usually called optical or radiation temperature measurement, is based on detecting electromagnetic radiation emitted from an object. In ventilation applications this method of measurement is used to determine surface temperatures in the infrared region. The advantage is that the measurement can be carried out from a distance, without contact with the surface, which possibly influences the heat balance and the temperatures. The disadvantages are that neither air (or other fluid) temperature nor internal temperature of a material can be measured. Also the temper-... 

Instruments with a balanced input circuit are available for measurements where both input terminals are normally at a potential other than earth. Further problems arise due to common-mode interference arising from the presence of multiple earth loops in the circuits. In these cases the instrument may need to be isolated from the mains earth. Finally, high-frequency instruments, unless properly screened, may be subject to radiated electromagnetic interference arising from strong external fields. 

Single-phase operation moves the rotor from 0°, to 90°, to 180°, to 270°, and to 360°, whereas the two-phase mode uses adjacent pairs of electromagnets so that rotor comes to a balance point between them, pulling the rotor from 45°, to 135°, to 225°, and to 315°. With pairs of electromagnets activated, the torque is increased. The half-step mode is a combination of both single phase and two phase, pulling the rotor from... 

The laboratory instrument built for measuring weight is called the balance. The name is derived from mechanical devices that utilize known weights to balance the object to be weighed across a fulcrum, like a teeter-totter. Most balances in use today are electronic, rather than mechanical, balances. An electronic balance is one that uses an electromagnet to balance the object to be weighed on a single pan. The older... 

We now turn to the momentum and energy balance of the electromagnetic field. In analogy with conventional deductions, Eq. (1) is multiplied vectorially by and Eq. (2), by eoE. The sum of the resulting equations is then rearranged into the local momentum balance equation... 

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