The relationship between dissipation power of microwave and temperature can be solved by calculation,then the temperature-rising curve fitting of carbon-containing chromite fines can obtain by it.
On this basis a medium pressure gas cooling system was built and succeasfuly used in a YAG laser which has a repetition rate of 10 Hz and heat dissipation power of 200 W.
The working temperature of semiconductor lie in dissipation power, environment temperature and condition of elimination of heat, the temperature and heat stress affect greatly the Reliability and electrical performance of apparatus.
the AC resistance of the conductive NR compound was lower than its DC resistance i the dissipation power which might result in fast desterioration of the conductive rubber by heat was 20-30W; the normal dissipation power of NR compound filled with super conductive black had better ner exceed 4W.
Based on TSMC 0.25 μm technics,the area of a 128 KB SRAM is 0.71 mm×4.6 mm; the time of data-read is 3.091 ns; the dissipation power is 37.985 mW with the frequency of 125 MHz.
In view of the contradiction among frequency, output power and dissipation power, propose deep-trench junction termination structure filling with isolated materials and collector-combed (base-combed) structure.
The cathode dissipation power can be reduced by increasing the number of the filaments of the oxide coated cathode and the thickness of the coating layer in the same heating power,preventing any damage to the coating layer during the heating process,and brief reduction at high temperatures and long time current activation for cathode in a vacuum system with a vacuum of about 10 -5 Pa so as to obtain desirable activity of the cathode.
A kind of three lines virtual arbitrary waveform generator with phases locked each other was introduced,in which EP1C6144C8 was used for digital core,DDS technique was applied for generating waveforms,whose frequency changed from 0.009 3 Hz to 1 MHz in 0.009 3 Hz step,voltage at -8～8 V in 5 mV,phase at 0～360° in 0.176°,duty cycle at 0～1 in 0.05%,the number of waveform and direct voltage could also be adjusted in step,the design principle of system,FPGA design,phase error analysis and dissipation power design were mainly given,experiment showed the design was feasible.
Over hot is the main reason of PIN switches’failure, therefore thermo-resistance and device dissipation power measurement to estimate the inner temperature accurately is necessary dramatically.
A group of curves of surface temperature rise with respect to the heat resistance of SCR units at different wattless dissipation power were worked out as the basis of heat dissipation in choosing whether of the two types of SCR units.
Using the integrated formula of Bessel function which is based on the distribution of field,the stored energy,the dissipation power of average for time expression,a factor of cold quality is determined.
Since the PWM rectifier for the reciprocal power-fed test rig provides only the dissipation power of the system,its rated power capacity is decreased greatly. Thus the medium low-power three-phase bridge-type 4-quadrant converter is able to supply the medium high-power test rig.
The article analyses the relations among active dissipation, power factor and input voltave of asychronous electric motor in operation, explains the electricity-saving Principle of the opcrstive asychronous electric motor when its voltave is reduced, and works out its applied condition under SCR-controlled triggered dy specific delay angle.
It is necessary that the cathode should provide sufficient plate current,which is also a basic condition for the reduction of the grid dissipation power.
A theoretical model has been adopted to analysis the unsteady thermal effects in a laser medium. It is based on the fact that the internal dissipation power is always unequal to the heat removed from the surface.
To solve cooling problem of array arrangements of travelling wave tubes with high heat dissipation power,high heat flux and multiple heat sources,a new cold plate equipment embedded with heat-pipes is designed.
Conditions which must be satisfied by the steady flow of a rigid-plastic material through an extrusion die which minimizes dissipation power are derived.
The objective function corresponds to the dissipation power which is to be minimized and an upper bound to the plastic limit load of a structure can then be calculated by solving the minimum optimization problem.
The divider features a low dissipation power and stable gain of the photomultiplier tube, when the average anode current varies in the entire measurement range.
: In this paper, the potential and current patterns in the thin-film have been analyzed with the theory of 2-dimensional electric field. The expressions derived for attenuation, input and output characteristic impedance of attenuators with certain network patterns will prove to be of benefit for the design of thin-film attenuators. The dissipation power has also been discussed.
By using a Simulated model, this article established the basic heat transfer equations for laser-gas cooling systems. It can be used in the determination of heat resistance of each part in the system. Analysis indicates that increase in the circulating gas density can improve the heat transfer effect, decrease gas flow resistance and reduce power consumption. On this basis a medium pressure gas cooling system was built and succeasfuly used in a YAG laser which has a repetition rate of 10 Hz and heat #...
Experiment in heat exchange for various conditions os heat pipe and cast aluminum heat dissipator under natural and forced convection was made on test board to test the function of 500A plate-type and 300A bolt-type SCR units in explosion-proof housing. A group of curves of surface temperature rise with respect to the heat resistance of SCR units at different wattless dissipation power were worked out as the basis of heat dissipation in choosing whether of the two types of SCR units. The p...
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