Availability problem

Despite the fact that one of the first pteridine syntheses was based on an intramolecular Hofmann carboxamide degradation of pyrazine-2,3-dicarboxamide by action of potassium hypobromite and leads to lumazine (equation 104), (07CB4857), pyrazine derivatives in general have not often been used because of availability problems. The reaction of alkyl... 

If a proprietary simulation program is not available, problems involving recycle streams can be solved on a spreadsheet using the procedure described below. 

Even when solvation energies for the ions are available problems of interpretation remain. The factors which cause given observed solvation energy differences may not be obvious. Thermochemical data obtained from the determination of sequential gas-phase ion-solvent molecule equilibria can be extremely useful for this purpose. 

Reagents should have reasonable shelf life with no availability problems. Quality control of reagent lots must be available if questions of sensitivity or specificity should arise. 

Nuclide Half-life (years) Availability Problems... 

Beginning the process of solving a problem can sometimes be the most difficult part of the process. In many circumstances more information is needed than is available. The painless decision to bypass the tedious process of collecting information is easy to justify. The time required to look closely at all aspects of a problem before recommending a solution is often not available. Problem diagnosis and solutions, however, are often expected readily. 

When you retire and have more time available, problems may develop around who handles various chores. If you try to get more involved, your partner may see it as an invasion of his or her turf. If you don t get involved, your partner may resent your extra time. There is no way to resolve these problems other than talking them through. Here is an outline that will help facilitate such a discussion ... 

The Intel 8086 or 8088 microprocessors could be used in conjunction with the Intel 8087 floating point processor chip (4) which is probably twice as fast as the Am9511A for on-chip operations and includes extended precision arithmetic in its instruction set. Unfortunately the 8087 was only laid down on paper, not silicon, when this work started. The 8087 is now (January 1981) available in sample quantities at a price far in excess of the Am9511A. In addition to the price and availability problem the instruction set of the 8087 is less suited to chemical computations than the Am9511A in that many transcen-... 

An orthogonal collocation method for elliptic partial differential equations is presented and used to solve the equations resulting from a two-phase two-dimensional description of a packed bed. Comparisons are made between the computational results and experimental results obtained from earlier work. Some qualitative discrimination between rival correlations for the two-phase model parameters is possible on the basis of these comparisons. The validity of the numerical method is shown by applying it to a one-phase packed-bed model for which an analytical solution is available problems arising from a discontinuity in the wall boundary condition and from the semi-infinite domain of the differential operator are discussed. 

The installation-level allocation faced some difficulties, due to data availability problems. These difficulties even led the government to think initially of setting the amount of allowances per sector, allowing the respective sector association to distribute the allowances per installation. 

The potential availability problem might be substantially relieved if battery materials could be efficiently recovered. The development of cheap recycling methods is of primary importance... 

Undesirable rod motion can result from control system failure and can be either inward or outward. Inward motion is a plant availability problem, but is not a safety concern. The extreme case of undesirable inward motion is an inadvertent reactor trip. This event might be caused by a loss of power or erroneous trip signals. This event places the plant in a safe condition. 

Although modularity has many benefits, perfect modularity is difficult to achieve, particularly when changes are made to facility-wide systems, such as utilities. For example, a pump driver may be changed from a steam turbine to an electric motor. Apparently the only modules that are changed are those that concern the normal operation, start-up, and shutdown of that pump. Yet, placing a new turbine on the steam header may lead to steam availability problems that have system-wide effects and that affect many other equipment items. Hence the modules for all the other affected equipment items may require updating. 

There are, Kim says, two possible responses to the availability problem reduction to a disjunctive property or local reductions. Kim thinks there are reasons for dismissing the disjunctive move. It (or, strictly speaking, a move closely resembling it) is my preferred solution, so I ll defer discussion of Kim s objections until 1 present my own view. 1 want to concentrate at this point on Kim s discussion of local reductions. The idea here, similar to David Lewis s in Mad Pain and Martian Pain, is to eliminate a multiply realizable property in favor of a set of species- or structure-relative properties, each of which can be identified with an appropriate realizer property. Thus, while we can have no reduction of pain, per se, we can reduce pain-for-humans, pain-for-Martians, pain-for-cyborgs, and so forth. 

Sodium-cooled fast reactors promise to definitely solve the fuel availability problem as they can convert... 

The most severe among a list of multifactorial reasons [21] which have induced a medicines shortage, were Quality or availability problems related to active ingredients or to production processes or equipment (e.g. heparin contamination [22] and propofol case [23]) Demand spikes (e.g. oseltamivir following flu pandemic scenarios [24])... 

No aging and subsequent testing were performed beyond those in Table 13. Resorcinol dicyanate is one of many examples where excellent potential was demonstrated but no further results are available. Problems such as availability, toxicity, moisture and solvent resistance, low shelf life, processability, etc. often discourage further adhesive development. ResorcinoMicyanate is unavailable but a few other dicyanates are commercially available. No adhesive properties have been reported on these dicyanates. The adhesive work on resorcinol dicyanate is representative of company funded research that is not readily available to the public. 

Table 12.6 has the ASTM D 2226 Classification and also shows the limits for classifying process oils by VGC. All aromatic process oils must be labeled as potential carcinogens. Paraffinic types and treated naphthenic do not need to be labeled. There is a growing availability problem with naphthenic process oils due to a shortage of naphthenic-rich crude and the exit of producers not able to justify the capital cost of solvent or hydro-treatment. This will result in increases in the cost of naphthenic oils for use in the rubber industry in the near future. 

A common solution to the availability problem is the surrogate approach, i.e. if the record of data is too small or no data are available at all, it is attempted to establish a surrogate sample of recorded data larger than the real one of interest. Thus, the record of accidents at nuclear power plants, with no significant entries and a relatively limited exposure, is expanded by use of the record for conventional power plants. Differences are modified subjectively in various ways, depending on the expertise of the system analyst. 

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