Inversely restricted sampling

One charming idea for sampling is inversely restricted sampling... 

We next discuss the inversely restricted sampling already proposed by Rosenbluth and Rosenbluth. ° Rather than adding the next bond to the existing part of the SAW blindly, as one does in simple sampling, one scans the local environment of the last monomer and excludes all trail directions that lead... 

In principle, this method can also be applied to multichain systems, but the problem of correcting for the bias becomes even more severe. In practice, one therefore has to resort to the configurational bias method which is an extension of the Rosenbluth sampling (see Chapter 7). But, inversely restricted sampling is still one of the possible options for not too large... 

Inversely restricted sampling (Rosenbluth-Rosenbluth algorithm)... 

To study the importance of three body interactions on stars, Batoulis and Kremer carried out high precision MC simulations of linear and star polymers on the fee lattice for 1 [Pg.503]

Note that in this procedure the main decision required by the experimenter is the size of the dose. Of course, this will depend on the adsorption capacity of the sample and the number of experimental points desired. For a new, unknown sample, a first exploratory experiment with large doses is useful. Also, the fact that the final accuracy is an inverse function of the number of experimental points (because of the additivity of the errors made at each introduction of adsorptive) must be kept in mind. The introduction of the desired dose is made easier if the gas flow is restricted by a constriction or a needle valve. 

Strictly speaking, there are no static viscoelastic properties as viscoelastic properties are always time-dependent. However, creep and stress relaxation experiments can be considered quasi-static experiments from which the creep compliance and the modulus can be obtained (4). Such tests are commonly applied in uniaxial conditions for simphcity. The usual time range of quasi-static transient measurements is limited to times not less than 10 s. The reasons for this is that in actual experiments it takes a short period of time to apply the force or the deformation to the sample, and a transitory dynamic response overlaps the idealized creep or relaxation experiment. There is no limitation on the maximum time, but usually it is restricted to a maximum of 10" s. In fact, this range of times is complementary, in the corresponding frequency scale, to that of dynamic experiments. Accordingly, to compare these two complementary techniques, procedures of interconversion of data (time frequency or its inverse) are needed. Some of these procedures are discussed in Chapters 6 and 9. 

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