Research controls over

More precise control over the emission color may be achieved by employing equimolar quantities of a fc/.v-phosphonium salt, e.g., 67 and a dialdehyde containing a flexible unit sueh as 66. This approach has been exploited by a number ol researchers 98-102[. The emission wavelength of these materials is in the blue te blue-green region of the spectrum (470-495 nm). 

Radical polymerization is often the preferred mechanism for forming polymers and most commercial polymer materials involve radical chemistry at some stage of their production cycle. From both economic and practical viewpoints, the advantages of radical over other forms of polymerization arc many (Chapter 1). However, one of the often-cited "problems" with radical polymerization is a perceived lack of control over the process the inability to precisely control molecular weight and distribution, limited capacity to make complex architectures and the range of undefined defect structures and other forms of "structure irregularity" that may be present in polymers prepared by this mechanism. Much research has been directed at providing answers for problems of this nature. In this, and in the subsequent chapter, we detail the current status of the efforts to redress these issues. In this chapter, wc focus on how to achieve control by appropriate selection of the reaction conditions in conventional radical polymerization. 

An office of Research and Development, was established on the staff of AMC having control over such Laboratories as Diamond Ordnance Fuze, Ballistics Research, Environmental Research, Materials Research, and Human Engineering (Ref 3)... 

Committed to research and development Advanced in use of computers and computer controls Over 50% of the products are based on petroleum Best employee safety record among all major industries Criticized for many environmental problems... 

In recent years, much attention has been paid to the use of controlled/ living polymerizations from flat and spherical surfaces [121,122],because this allows better control over the MW and MWD of the target polymer. By using these techniques, a high grafting density and a controlled film thickness can be obtained, as such brushes consist of end-grafted, strictly linear chains of the same length and the chains are forced to stretch away from the flat surface. Several research... 

After extensive research, followed by numerous full-scale trials, BIM/Cellkem found the way to inhibit/ deactivate catalase and take control over the microbes. During this work we tried almost every biocide one can dream of. 

The entire CRT industry is based on the quality and reproducibility of the phosphors used. As stated earlier the phosphors used for the different kinds of CRT displays are constantly being researched and improved. For high-definition television screens the phosphors must be prepared with great control over powder morphology and particle size (see Section 9.15.4.2.1). 

In the United States, as in most other countries, individual informed consent is generally required before research may be done with a living, identifiable human being. Informed consent for research generally has two different justifications. First, it allows the potential subject to weigh for himself or herself the balance of risks and benefits from his or her participation in the proposed research. Second, it embodies the individual s autonomy and control over interventions in or about his or her own body. 

The ultimate goal of designing highly enantioselective aldol condensations demands that all stereochemical aspects of the bond construction process be kinetically controlled. Over the past 5 years, this objective has stimulated a great deal of research, and a wealth of new information is now becoming available on the important kinetic stereochemical control elements and possible transition state geometries for this reaction. 

A rigorous discussion of this extensive subject is beyond the scope of this book, and an extensive treatment is also probably not justified at this point in time. There has been a lot of interest by academia and by industry in these methods, but the jury is still out as to their real practical utility in chemical engineering processes with their very high order, nonlinearity, unknown noise properties, and frequent and unmeasurable load disturbances. Several industrial researchers have reported successful applications. But other industrial reports indicate a significant number of failures, or at least a lack of significant improvement in control over more simple conventional methods. 

Durkin T. 1992. GABAergic mediation of indirect transsynap-tic control over basal and spatial memory testing-induced activation of septo-hippocampal cholinergic activity in mice. Behavioral Brain Research 50(1-2) 155-165. 

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