Microprocessor systems

Figure 4-93. Dual microprocessor system used to supervise and control turbomachinery. (Source Elliott Company.)...

In microprocessor systems, the FFT signature is formed by breaking down the total frequency spectrum into unique components, or peaks. Each line or peak represents a specific frequency component that, in turn. 

Stabilization of different parameters with their change in a wide range (e.g. 50-100-300%), including the voltage stabilizers for microprocessor systems with a wide range of allowed change of the load etc. 

A typical arrangement for interfacing a microprocessor system to laboratory instruments. 

The Rb-82 generator permits serial studies in the same patient as often as every 10 minutes with 20-60 mCi of Rb-82 for rapid bolus intravenous infusion. Inherent in the administration of high levels of Rb-82 activity is the need for precise flow control from an automated system to deliver the desired amount of radioactivity. The development of the alumina column parameters and the elution protocol as well as the automated microprocessor system controller are presented here. Some of the details of this system have been discussed in earlier publications (15,21). Generator produced Rb-82 is used as a diffusible flow tracer in myocardial perfusion studies and as a nondiffusible tracer in brain studies to assess blood brain barrier permeability changes in patients with brain tumors or Alzheimer s type dementia. 

B. Drevillon, J. Perrin, R. Marbot, A. Violet and J. L. Dalby, Fast polarization modulated ellipsometer using a microprocessor system for digital fourier analysis, Rev. Sci. Inst., 53,969 (1982). 

The biggest change is in price. Hardware has dropped in price dramatically. Manpower costs have risen. The power of the systens available - at a particular price - has improved, and the software is far superior to that of eight years ago. (On the established 15- and 32-bit systems, microprocessor systems, while moving rapidly, are still far behind- the capability of larger vendors products.)... 

During the last two years Atlantic Scientific Corporation have been working with a large Ohio based company that manufactures brain and body scanners for hospitals. These are commonly called CAT scanners (Computerized Axial Tomography), and each consists of a large computer and several other microprocessor systems. 

The logic to search for and follow an exotherm is programmed to permit use of a selection of run parameters and to provide an on-line display of critical variables such as time, temperature, and pressure. A search for a reaction exotherm is accomplished by elevating the sample temperature by a fixed increment (step-heat) and then checking to see if the sample self-heat rate exceeds a user-selected threshold. Once an exotherm is detected, automatic collection of time, temperature, and pressure data is carried out until the reaction has finished and the self-heat rate has dropped back below the threshold value. All operations are controlled by a microprocessor system with final data presentation presented via a built-in line printer. 

As one can see in Table 5.3, from the total amorrrrt of faults injected, around 20 % affected the system arrd cairsed an error in the firral result. When protected by the OCFCM techniqrres, 100% of the faults were detected. In order to confirm these results, we injected another 140,000 faults in the PC (which is the most sensitive area of the microprocessor with respect to control flow errors) of the bubble sort application, due to its low execution time and got 100% fault detection. These results mean that the studied hardening approach was able to fully protect the microprocessor system, by detecting every transient fault injected in the case-study appUcatiorrs. Aside from these results, an average of 1 % faults with no errors per application was detected. 

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