Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Need for modifications

Our company is dedicated solely to metal-ceramic X-ray tubes since 25 years over this time, we have made lots of different tube models especially for tyre inspection systems. The major reasons for the use of metal-ceramic tubes in this inspection technology are robustness, their small and individual shapes, and the frequent need for modifications of their design due to custom designed systems. [Pg.535]

This model is a modification of the model developed by Kumar and Kuloor (K18) for bubble formation in inviscid fluids in the absence of surface-tension effects. The need for modification arises because the bubble forming nozzles actually used to collect data on bubble formation in fluidized beds differ from the orifice plates in that they do not have a flat base. Under such conditions the bubble must be assumed to be moving in an infinite medium and the value of 1/2 is more justified than the value 11/16. [Pg.320]

Although this arrangement obviates the need for modifications of organometallic catalysts in order to make them water soluble, the number of interesting water soluble substrates is rather limited. Nevertheless a few such efforts are worth mentioning. [Pg.64]

Level 4 No need for modification current system is formalized and state of the art. [Pg.454]

An algebraically very simple theory can be developed from a set of five assumptions. As will be shown, its predictions are reasonably borne out by a fair body of data. It is now generally accepted as a suitable basis for discussing simple cases. It can be adapted to meet special circumstances and extended to overcome some of the weaknesses of the assumptions. Indeed, exception can be taken (and has been taken) to nearly every one of these assumptions, and the extent of their validity and the need for modification of the theory are further discussed in Section IV. [Pg.265]

There may be a need for modification of the JumpSTART model for children who can t walk because of young age or developmental/motor delay. In these patients, triage personnel should use the usual JumpSTART algorithm. If the patient satisfies criteria for the... [Pg.169]

Further work by Schopf and Borkowsky [86] indicated the need for modification of the structure with attachment of the side-chain at C-14 in metathebainone [lvih], which is formed by the reduction of thebaine with stannous chloride in concentrated hydrochloric acid [27], The true thebainono [lix] was later isolated from the stannous chloride reduction under difforont conditions. Metathebainone arises as a result of rearrangement of thebaine in concentrated hydrochloric acid, now believed to involve the intermediate [i.x], which is also believed to be common to the morphothobaino and thobouino transformations [88-80J. (Hoc Chap. XXV,)... [Pg.10]

Need for modification of antimicrobial therapy shonld be evalnated in nentropenic cancer patients who remain febrile despite 3 to 5 days of antibiotic therapy. The same antibiotic regimen can be con-tinned in febrile but stable patients, especially if neutropenia is expected to resolve within a week. The antibiotic regimen may reqnire modification in patients experiencing toxicides, as well as in patients... [Pg.2201]

The most popular tool for monitoring single-loop feedback and feedforward/feedback controllers is based on relative performance with respect to minimum variance control (MVC) [53, 102[. The idea is not to implement MVC but to use the variance of the controlled output variable that would be obtained if MVC were used as the reference point. The variation of the inflation of the controlled output variance indicates if the process is operating as expected or not. Furthermore, if the variance with a MVC is larger than what could be tolerated, this indicates the need for modification of operating conditions or process. [Pg.234]

As mentioned above, the compactibility of a particulate solid, the development of strength, and the potential need for modifications of the feed (e.g., particle size and distribution, composition, temperature, binder) can be evaluated with a laboratory punch-and-die press. However, this result only provides an answer to the question whether or not a material can be compacted and under which conditions. The pressure used during such an experiment, for example, can in no way be converted to the force that a roller press will have to exert for achieving the same good quality compacts. [Pg.970]

In the manufacture of sterile radiopharmaceutical the need for modifications of guidance given elsewhere is likely to be most apparent. Non-radioactive components should be prepared as described in Section 9. It may be necessary to handle radioactive materials in a contained work station operated at an air-pressure below that of the room in which it is sited. Air admitted to the room should still have passed through terminal filters of appropriate porosity so that with the operator present and work in progress, the required class conditions (see Section 9) are maintained at the point of greatest risk, where products are exposed. All operations up to the stage of sterilization should be carried out in a manner which minimizes microbial and particulate contamination. [Pg.690]

Manual methods the model or mock-up is realized by operators using manual skills. This method is costly but allows accurate copies of the final product with low time needed for modifications. This method is used particularly when aesthetic features are required. [Pg.1008]

Compared to previous gluten based adhesives the present resins are applicable in liquid form, thus without any need for modifications of the application systems in particleboard factories. Relative to other protein adhesives such as soy-based adhesives based on reaction with formaldehyde some of the resins presented here have several advantages (i) they cannot and do not produce any aldehyde emission as neither formaldehyde nor any other volatile aldehyde was used in some of the formulations (ii) the percentage of natural materials was increased up to 70% for one type of formulation and up to 95% for others. Furthermore, in relation to resin formulations based on different cross-linking reactions other than those with formaldehyde the resins presented here have other advantages they are competitive with alternate natural resin systems such as those based exclusively on tannins and/or lignins. [Pg.376]

An alternate explanation is that some sort of image force may affect the electrolyte directly behind the adsorbed ion layer, so that an adsorbed anion, for instance, would have some preference for a cation as a 2nd-layer near neighbor. This, in fact, now brings us to the need for modifications in the first-order theory. [Pg.136]

If it should occur that an OLC is not being met or a procedure cannot be followed, then this should be reported and the causes should be analysed. This may lead to the modification of an OLC or procedure in accordance with established procedures which allow for changes to be made in a controlled manner and approved, as required by the regulatory body. Results of routine or conunissioning tests also necessitate analysis and consideration of the need for modifications to the OLCs and/or the OPs. [Pg.26]

The morphology and the catalytic activity of the surface will vary, especially if the reaction involves metal deposition or dissolution and this will again lead to the need for modification of the figure. [Pg.57]

Advising on the suitabiiity and compatibiiity of designs and on any need for modification > Coordinating design work, pianning and other preparation... [Pg.363]

Organocatalysts are often nonionic liquid modified-silica, polyelectrolytes, montmorillonite, or P-cyclodextrin. Although bond strength in non-covalently supported catalyst is weak, the catalyst itself is directly used for immobihzation without the need for modification or synthetic steps required for covalent attachment to support [113],... [Pg.832]

Besides being used as animal feedstock, plant-derived oils are drawing attention as an alternative to marine oils to feed aqnacnlture and other farmed carnivores. Although plant oils are considered to be a cheap and renewable source for animal feed, there is still a need for modification to meet the nutritional reqnirements of fish and animal stocks (Thompson, 2000). Vegetable oils for fish shonld contain 18 2 n-6, 18 1 n-9, and n-3 PUFA. Rapeseed oil contains... [Pg.382]

The need for modification results from the native starch properties, which are frequently not sufficient for special applications. [Pg.193]


See other pages where Need for modifications is mentioned: [Pg.312]    [Pg.76]    [Pg.280]    [Pg.328]    [Pg.97]    [Pg.604]    [Pg.147]    [Pg.465]    [Pg.456]    [Pg.938]    [Pg.170]    [Pg.50]    [Pg.326]    [Pg.237]    [Pg.240]    [Pg.113]    [Pg.168]    [Pg.227]    [Pg.457]    [Pg.204]    [Pg.221]    [Pg.71]   


SEARCH



© 2024 chempedia.info