Shortcomings

If there is sufficient flexibility in the choice of model and if the number of parameters is large, it is possible to fit data to within the experimental uncertainties of the measurements. If such a fit is not obtained, there is either a shortcoming of the model, greater random measurement errors than expected, or some systematic error in the measurements. 

The shortcoming of the maximum exposure and payout time is that they say nothing about what happens after the cashflow becomes positive (i.e. the investment is recouped). Neither do they give information about the return on the investment in terms of a ratio, which is useful in comparing projects. 

A visual method is considered by the most of regulations in force as a base for rope inspection. Instrumental methods using rope flaw detectors are considered as additional ones. But the visual methods have the number of shortcomings ... 

Shortcomings of Wang s method like limited pitch of the spiral and blurring in the vertical direction can be improved by the CFBP-algorithm [10], where gaps in the spiral sampling pattern are filled using X-rays measured from the opposite side. 

Due to the well known human shortcomings the probability of finding flaws using Magnetic Particle Inspection (MPI) or Liquid Penetrant Inspection (LPI) can be restricted to only 60-85% and the inspection reproducablity is difficult. 

We are sure that with this system we have developed a powerful tool to eliminate the shortcomings of manual inspection as discussed in the beginning of the article. We are also sure that this automatised test is not suitable in all applications. However, where there are many details to be tested and where these can be handled automatically, we think AMPl may be a competetive alternative which improves both the quality of inspection and the working environment. 

Nonnal spontaneous Raman scahering suffers from lack of frequency precision and thus good spectral subtractions are not possible. Another limitation to this technique is that high resolution experiments are often difficult to perfomi [39]. These shortcomings have been circumvented by the development of Fourier transfomi (FT) Raman spectroscopy [40]. FT Raman spectroscopy employs a long wavelength laser to achieve viable interferometry. 

Despite all the shortcomings listed above, full particle classical MD can be considered mature [84]. Even when all shortcomings will be overcome, we can now clearly delineate the limits for application. These are mainly in the size of the system and the length of the possible simulation. With the rapidly growing cheap computer memory shear size by itself is hardly a limitation several tens of thousands of particles can be handled routinely (for example, we report a simulation of a porin trimer protein embedded in a phospholipid membrane in aqueous environment with almost 70,000 particles [85] see also the contribution of K. Schulten in this symposium) and a million particles could be handled should that be desired. 

One flux model for a porous medium—the dusty gas model- has already been described in Chapter 3. Although it is perhaps the most important and generally useful model currently available, it has certain shortcomings, and other models have been devised in attempts to rectify these. However, before describing these, we will review certain general principles to which all reasonable flux models must conform. 

Of course, these shortcomings of the Wakao-Smith flux relations induced by the use of equations (8.7) and (8.8) can be removed by replacing these with the corresponding dusty gas model equations, whose validity is not restricted to isobaric systems. However, since the influence of a strongly bidisperse pore size distribution can now be accounted for more simply within the class of smooth field models proposed by Feng and Stewart [49], it is hardly worthwhile pursuing this."... 

To move up the scale of complexity one now needs to consider the energetics o rotation about each bond. The simplest approach is to assume that each bond can be treatec independently 2md that the total energy of the chain is the sum of the individual torsiona energies for each bond. However, this particular model has some serious shortcoming arising from the assumption of independence. 

The arrival of the Olah group at the USC campus with its moving vans caused quite a stir. Whatever shortcomings our temporary quarters had were overcome by our enthusiasm, and, miraculously, in 3 weeks we were back doing research. I am not sure whether everybody at USC was pleased by this invasion and our determination to over-... 

Dewar and his co-workers, as mentioned above, investigated the reactivities of a number of polycyclic aromatic compounds because such compounds could provide data especially suitable for comparison with theoretical predictions ( 7.2.3). This work was extended to include some compounds related to biphenyl. The results were obtained by successively compounding pairs of results from competitive nitrations to obtain a scale of reactivities relative to that of benzene. Because the compounds studied were very reactive, the concentrations of nitric acid used were relatively small, being o-i8 mol 1 in the comparison of benzene with naphthalene, 5 x io mol 1 when naphthalene and anthanthrene were compared, and 3 x io mol 1 in the experiments with diphenylamine and carbazole. The observed partial rate factors are collected in table 5.3. Use of the competitive method in these experiments makes them of little value as sources of information about the mechanisms of the substitutions which occurred this shortcoming is important because in the experiments fuming nitric acid was used, rather than nitric acid free of nitrous acid, and with the most reactive compounds this leads to a... 

Poly(vinyl cinnamate) Resists. Dichromated resists exhibit numerous shortcomings which include lot-to-lot variabiUty of the components, aging of the formulated resists in solution and in coated form, poor process stabiUty (due to a sensitivity to variations in temperature and humidity), and intrinsically low photosensitivity requiring long exposure times for adequate insolubilization. 

Finally, it is difficult to caUbrate the depth scale in a depth profile. This situation is made more compHcated by different sputtering rates of materials. Despite these shortcomings, depth profiling by simultaneous ion sputtering/aes is commonly employed, because it is one of the few techniques that can provide information about buried interfaces, albeit in a destmctive manner. 

Mesylated and Tosylated Celluloses. It has been estabUshed that the flame resistance of ceUulose (qv) is improved by oxidation of —CH2OH groups to —COOH (58—60). To correct some of the shortcomings of this treatment, mesyl or tosyl ceUulose was prepared and then the mesyl (CH2SO2) or tosyl (CH2CgH4S02) group was replaced with bromine or iodine (58—60) ... 

Countries that use a mixed-system, eg, Argentina, Germany, Italy, Spain, and the Netherlands, have a positive fist for artificial flavor materials, and a restricted fist of natural and nature identical flavor materials. This system addresses some of the shortcomings of the positive and negative fist systems. 

The shortcomings of microhardness tests include numerous sources of errors not found in macrohardness tests such as friction, vibration, inertia, windage, and the skiH of the test operator. 

High Water-Base Fluids. These water-base fluids have very high fire resistance because as Httle as 5% of the fluid is combustible. Water alone, however, lacks several important quaUties as a hydrauHc fluid. The viscosity is so low that it has Httle value as a sealing fluid water has Httle or no abiHty to prevent wear or reduce friction under boundary-lubrication conditions and water cannot prevent mst. These shortcomings can be alleviated in part by use of suitable additives. Several types of high water-based fluids commercially available are soluble oils, ie, od-in-water emulsions microemulsions tme water solutions, called synthetics and thickened microemulsions. These last have viscosity and performance characteristics similar to other types of hydrauHc fluids. 

However, reaction 7 suffers other shortcomings, eg, entropy problems. Other proposals range from trace peroxidic contaminants to ionic mechanisms for generating peroxides (1) to cosmic rays (17). In any event, the initiating reactions are significant only during the induction period (18). 

Added Water. Frankfurters and bologna are allowed to contain combinations of fat and added water not to exceed 40% with a maximum fat content of 30%. This allows, for example, a 10% fat frankfurter to be produced with 30% added water. Substitution of large amounts of fat with water alone may not give the optimal sensory and textural properties that consumers want (43). To overcome these shortcomings, several binders can be added to improve water and fat-binding properties, cooking yields, texture, and flavor (27). 

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