Computer programs analyses

For complex offshore structures or where foundations may be critical, finite-element analysis computer programs with dynamic simulation capability erm be used to evaluate foundation natural frequency and the forced vibration response. 

For data influenced only by small random fluctuations, it can be shown that the proper criterion is a minimization of the sum of the squares of the deviations from the fitting line. Obtaining the best-fitting line by this criterion is known as linear regression analysis. Computer programs, such as Mathcad, as well as most scientific calculators can perform linear regression analysis. In case these are not available, the relevant formulas are as follows. 

The use of a special multiple regression analysis computer program which can include the restrictive equations properly leads directly to the proper solution. To use a standard multiple regression analysis program one must incorporate the restrictive conditions as follows. Recalling that A = — B — 3/4C — D, the entire column for the A term is removed from... 

An experiment using thermobalance yields a record of the cell mass with sample as a function of time. From the slope of this curve, the rate of mass loss is determined. The inert gas pressure in the furnace is read on a manometer, and is lowered stepwise in the course of the experiment. Thus a set of corresponding values for n2 and P, which may be considered as knowns in Eq. (7.15) is obtained. On the other hand, the parameters A, B, C, P, and y are generally unknown, since the molecular mass of the vapor, which is included in the parameter y, is not known a priori. The problem may be handled by means of a suitable, non-linear least-squares analysis computer program, which fits Eq. (7.16) for the observed set of data. 

Actinomycin D dissociation kinetics were measured on a Cary 219 spectrophotometer equipped with a magnetic stirrer and thermostated cell holders. Sodium dodecyl sulfate (SDS) was used to sequester dissociating actinomycin D, and the resulting Increase In absorbance was monitored at 452 nm as a function of time. Stop-flow studies (daunorubicin and daunorubicin/ actinomycin D) were conducted with a Durrum-Glbson Model 110 stopped-flow spectrophotometer equipped with a dual detector accessory and a Tektronix storage oscilloscope Interfaced with a PDF 11/34 computer. Experiments were done In a 0.01M Na phosphate buffer, 0.1M NaCl, 0.001M NaEDTA, pH=7. Dissociation time constants were computed with a multlexponentlal analysis computer program. 

A Structural analysis computer program called NASTRAN has been made available by COSMIC to a wide variety of industrial firms who have applied it to an equally wide variety of uses. 

Spectrophotometric devices, called microplate readers, collect raw data resulting from colorimetric or fluorescent screens. Similarly, scintillation devices measure the amount of radioactivity in samples from drug screens. The computer format of the data will then allow it to be exported into a spreadsheet or statistical analysis computer program for analysis. 

EVALUATING THE FAULT TREE. After a fault tree is constructed, it can be input to a fault tree analysis computer program, such as FTAP, IRRAS, or WAM. The output from the computer program is a list of MCSs which cause the top event to occur. For each of the MCSs, the analysts describe the consequences associated with that cut set. Table 4.25 shows a typical worksheet used to document the consequences associated with MCSs. 

Often it is impractical to model, in the seismic analysis of a plant, all the components located at different heights. The need arises to define methods of identifying a seismic excitation (spectrum or accelerogram) by which resistance and functionality of the essential components can be verified. In reality, recently the problem has been simplified by the development of dynamic analysis computer programs, which makes the modelling of structure-component complexes easier. 

ANL has developed a dual field image analysis computer program which we hope to acquire soon to compare and evaluate NDE images obtained using different techniques (radiography, NMRImaging and ultrasonics). 

RETRAN (REactor TRansient ANalysis) is a best-estimate transient thermal-hydraulic analysis computer program (sponsored by EPRI) designed to provide analysis capabilities for BWR and PWR transients, small-break LOCAs, balance-of-plant modeling, and anticipated transients without scram (ATWS). 

There are about 25 time domain analysis computer programs that are available globally, either commercially or through direct contact with the author(s). However, only a handful of these programs have a provision to perform an effective-stress analysis, including 2-D and 3-D programs which can be used for analysis of 1-D geometry. 

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