The Classification Stage

Work is proceeding to develop suitable scenarios and indicators for assessing sustainability. Many of the environmental indicators proposed are based on LCA methodology and broadly correspond to those used at the classification stage. 

A much more severe test is that leading to UL-94-5V classifications. This involves two stages. In the first stage a standard 5 X 0.5 inch bar is mounted vertically and subjected to a 5 inch flame five times for 5 seconds duration with an interval of 5 seconds. To pass the specification no specimen may bum with... 

Since the publication of the Standardised Sleep Manual by Rechtshaffen and Kales (Eds) in 1968, human sleep has been described using a classification system based on a combination of EEG, EMG and EOG features. The acquisition and use of such data is known as polysomnography. Note, that when including the state of WAKE in the classification, these are most accurately described as arousal states in place of sleep stages. 

Figure 3.25a/b shows the SOM at an early stage of development and Figure 26a/b the completed map. Figure 27a/b shows another run on the same set of data. The two completed maps are quite different in appearance, an effect that we noted before with the two-dimensional arrow set, but tests show that they have similar ability in the classification of samples. 

Thus, cholinergic receptor classification can be considered in terms of three stages of development. Initially, Dale [2] distinguished nicotinic and muscarinic receptor subtypes with crude alkaloids. Then, chemical synthesis and structure-activity relationships clearly revealed that nicotinic and muscarinic receptors were heterogeneous, but chemical selectivity could not come close to uncovering the true diversity of receptor subtypes. Lastly, analysis of subtypes came from molecular cloning, making possible the classification of receptors on the basis of primary structure (Fig. 11-2). 

Finally there will be some very high concern chemicals for which uses have to be authorised. Many of these will already be known, because the CMR classifications are already established. Other substances for authorisation will be identified as the initial registration data are developed and collated, perhaps especially for those found to be classed as PBT or vPvB substances. Other new CMR substances requiring authorisation will emerge at the evaluation stage when the additional studies are undertaken. 

The definitions in the first section of this chapter can be useful in many ways for design, especially in the stages of search, physical prototype and manufacture. For example, the classifications of Figure 15.4-1 can help to establish the order in which different decisions related to the product must be made. For example, the procedure for a product of type 5, can start by identifying the components that contribute to the properties that are not complementary with the environment. In a second stage, we identify the most appropriate components for the complementary properties with the environment. 

The study of the molecular weight of the intermediate course is an effective method for the classification of polymerization as chain or stepwise reaction. In Figure 3, the molecular weight of the obtained polymer is plotted against the yield, for the oxidative polymerization of dimethylphenol with the copper catalyst and for the electro-oxidative polymerization. The molecular weight rises sharply in the last stage of the reaction for the copper-catalyzed polymerization. This behavior is explained by a stepwise growth mechanism. 

Instead, the first step should be a thorough review of processes, machinery variations, employee job functions for all affected job classifications, dust generation points, dust control equipment, and air handling systems (1 ). With this data In hand, and an accurate layout of the plant, one can begin the three-stage process of selecting plant sampling positions. 

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