Results wrong

Simulated calculations are still acceptable instrument for calculations of reliability complicated electrical nets, which do not have analytical solution, or only with big problems. But a result of simulation still depends on man, who create simulative models and who has to understand that model. Another question is to correct interpretation of results, because you can have also with good results wrong conclusion. 

A result wrongly indicating that the analyte concentration does not exceed a specified value. 

We will refer to this model as to the semiclassical QCMD bundle. Eqs. (7) and (8) would suggest certain initial conditions for /,. However, those would not include any momentum uncertainty, resulting in a wrong disintegration of the probability distribution in g as compared to the full QD. Eor including an initial momentum uncertainty, a Gaussian distribution in position space is used... 

This result agrees with Computer Project 6-1, but it is not very good, —0.4244 hartrees, as compared to the exact solution of —0.5000, a 15.1% error. What went wrong ... 

Quantum mechanics gives a mathematical description of the behavior of electrons that has never been found to be wrong. However, the quantum mechanical equations have never been solved exactly for any chemical system other than the hydrogen atom. Thus, the entire held of computational chemistry is built around approximate solutions. Some of these solutions are very crude and others are expected to be more accurate than any experiment that has yet been conducted. There are several implications of this situation. First, computational chemists require a knowledge of each approximation being used and how accurate the results are expected to be. Second, obtaining very accurate results requires extremely powerful computers. Third, if the equations can be solved analytically, much of the work now done on supercomputers could be performed faster and more accurately on a PC. 

Parosmia. A disturbance to the sense of smell resulting ia smelling the wrong odors, usually perceived as repulsive. 

AH corrosion inhibitors in use as of this writing are oil-soluble surfactants (qv) which consist of a hydrophobic hydrocarbon backbone and a hydrophilic functional group. Oil-soluble surfactant-type additives were first used in 1946 by the Sinclair Oil Co. (38). Most corrosion inhibitors are carboxyhc acids (qv), amines, or amine salts (39), depending on the types of water bottoms encountered in the whole distribution system. The wrong choice of inhibitors can lead to unwanted reactions. Eor instance, use of an acidic corrosion inhibitor when the water bottoms are caustic can result in the formation of insoluble salts that can plug filters in the distribution system or in customers vehicles. Because these additives form a strongly adsorbed impervious film at the metal Hquid interface, low Hquid concentrations are usually adequate. Concentrations typically range up to 5 ppm. In many situations, pipeline companies add their own corrosion inhibitors on top of that added by refiners. 

Manufacture of oBenzoylbenzoic Acid from l-Methyl-3-phenylindane. In 1909 it was reported that treatment of styrene with concentrated sulfuric acid resulted in its dimerization (51). However, the wrong stmcture was assigned to this dimer (52). Years later it was suggested, without proof, that the dimer consisted primarily of l-methyl-3-phenylindane (13) [6416-39-3] and some 1,3-diphenyl-l-butene (53). In 1950, oxidative studies on the dimer proved that this supposition was correct (54) ... 

Implantable valves, particularly mechanical valves which continue to encroach on tissue valves, are unique. Methods such as valvuloplasty, mitral valve repair, or use of ultrasound are unlikely to reduce the number of valve replacements into the twenty-first century. Valve selection remains in the hands of the surgeon because of the critical nature of the procedure. If anything goes wrong, the result can be catastrophic to the patient. Cost of a valve, from 3000— 4000, is a relatively small part of the cost of open-heart surgery which can mn as high as 30,000. Growth of the cardiovascular valve market has slowed in the United States with the decline of the threat of rheumatic fever. 

The method of allocating overheads can seriously affect the assigned costs of a project and hence the apparent cash flows for that project . Since these cash flows are used to assess profitability by the net-present-value (NPV) and discounted-cash-flow-rate-of-return (DCFRR) methods, unfair allocation of overhead costs can result in a wrong choice between alternative projec ts. 

Identify the scenario. What can go wrong to result in the loss of containment of the material ... 

Incorrect information can result if the probe is made of the wrong material and is not heat treated in the same way as the process equipment (as well as because of other problems). The probe must be as close as possible to the material from which the equipment of interest is made. Existence of a critical condition, such as weldments or galvanic couples or occluded cells in the eqmpment of concern, makes the fabrication, placement, and maintenance of the probes and monitoring system or critical importance, if accurate and useful data are to be obtained. 

These measurements with their inherent errors are the bases for numerous fault detection, control, and operating and design decisions. The random and systematic errors corrupt the decisions, amplifying their uncertainty and, in some cases, resulting in substantially wrong decisions. 

Inactive and/or wrong catalyst. Possibility for accumulation of reactant and subsequent runaway reaction in reactor or downstream vessel. Possibility of no reaction resulting in a waste disposal issue. 

The basic phenomenon was observed in modeling studies by Bjoreskov and Slinko (1965) that sudden increase in inlet temperature caused a transient drop of the peak temperature. The wrong-way response name was given by Mechta et al (1981) after they experienced the opposite a sudden of inlet temperature resulted in an increase of the peak temperature (which may eventually cause a runaway.) The work used a pseudo-homogeneous reaction model and explained the phenomenon by the different speeds of transient response in gas and solid. The example in the last part of Chapter 7.4 explained the speed difference by the large difference in heat capacity of gas and solid phases. For this a two-phase model is needed and spatial and time changes must be followed. 

Side studies should be done by in-house company personnel if possible. If communications are not perfect, it is easy for a contractor to provide a study on the wrong basis. Company design and operating and economic philosophy often are not fully communicated to the contractor with resulting waste of time. In any event, as discussed previously, in-house personnel must do economics. Therefore, use of a contractor is limited to the same portions of the side study as for the overall evaluation. 

The seleetion of the eontrol IC is very important. If the wrong ehoiee is made, it eould result in supply instability and waste valuable time. The designer should understand the subtle differenee between the various forms of eontrol. In general, forward-mode topologies usually have voltage-mode eontrollers, and boost-mode topologies usually have eurrent-mode eontrol. This is not a roek-solid rule sinee every method of eontrol ean be used for every topology, with mixed results. 

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