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Intuitive Approach

In order to relate the free energy of the polymer chain to that of the reference fluid, we now consider a thermodynamic cycle which is the result of summing four different free energy contributions  [Pg.60]

Clearly, the four contributions add up to zero. By definition, however, the second and fourth contributions are AF and A Fief, the residual free energies of the polymer and reference systems, respectively. Substitution of Eq. (101-102) into the above expression then yields  [Pg.60]


Perhaps our first instinct is to take the most direct approach. Namely, to simply write down and solve a set of Newtonian cquations-of-motion describing the scattering dynamics in terms of basic system valuables. While this naive, intuitive approach might be attractive, we show below that it turns out to be both right and wrong . [Pg.460]

From this intuitive approach we can develop some further conclusions. [Pg.365]

The Complexity Distribution. —The number of molecules composed of n branch units irrespective of the number I of bifunctional units, which we have called the complexity distribution, may be obtained by summing over all I in Eq. (A-8). A more intuitive approach to the same result will be followed here. We consider the probability a that an A group of one branch leads via a sequence of zero or more A----A units to another branch. [Pg.395]

One basis for providing a safety factor is to arbitrarily increase the soil thickness (e.g., build the soil 50% thicker than indicated as adequate by design). However, this intuitive approach may not produce the desired result. [Pg.1073]

In order to arrive at a mathematical relationship to describe London forces, we will use an intuitive approach. First, the ability of the electrons to be moved within the molecule is involved. Atoms or molecules in which the electrons are highly localized cannot have instantaneous dipoles of any great magnitude induced in them. A measure of the ability of electrons in a molecule to be shifted is known as the electronic polarizability, a. In fact, each of the interacting molecules has a polarizability, so the energy arising from London forces, Ei, is proportional to a2. London forces are important only at short distances, which means that the distance of separation is in the denominator of the equation. In fact, unlike Coulomb s law, which has r2 in the denominator, the expression for London forces involves r6. Therefore, the energy of interaction as a result of London forces is expressed as... [Pg.188]

These intersections could be computed in explicit equations since everything is linear. We take a more intuitive approach starting from the first spectrum, we walk backwards on the line until we hit the wall. This happens when the first molar absorptivity becomes negative. We repeat the... [Pg.232]

Today we see more and more instrument manufacturers taking advantage of this type of user interface. Most would agree that it adds a level of simplicity to the instrument and, in many cases, is a more intuitive approach for the laboratory. [Pg.598]

Mathematical Description of PLS and PCR In this section, the PCR algorithm is described as a two-step procedure of PCA followed by MLR. Although in practice the steps are combined, we feel tliis is tlie most intuitive approach to understanding the algorithm. This description of PCR is followed by a brief discussion of the differences between PLS and PCR. [Pg.145]

If the flow rate is increased so that Peclet number Pe l, then there is a timescale at which transversal molecular diffusion smears the contact discontinuity into a plug. In Taylor (1993), Taylor found an effective long-time axial diffusivity proportional to the square of the transversal Peclet number and occurring in addition to the molecular diffusivity. After this pioneering work of Taylor, a vast literature on the subject developed, with over 2000 citations to date. The most notable references are the article (Aris, 1956) by Aris, where Taylor s intuitive approach was explained through moments expansion and the lecture notes (Caflisch and Rubinstein, 1984), where a probabilistic justification of Taylor s dispersion is given. In addition to these results, addressing the tube flow with a dominant Peclet number and in the absence of chemical reactions, there is... [Pg.2]

If this treatment of forces between particles fails to convince the reader that it is natural for particles to stick together, one can resort to the more intuitive approach. It is well known that inorganic colloids require a stabihzing agent to prevent their sticking together and eventually precipitating, hi other words, precautions usually have to be taken to prevent the natural tendency of these particles eventually to stick to each other. [Pg.36]

A Class I charge is one which is not determined from quantum mechanics, but through some arbitrary or intuitive approach. For instance, in a neutral diatomic molecule having a known dipole moment, one atomic charge must be +q and the other, to preserve charge balance, must be —q. One obvious choice for q will be that value that, in conjunction with the experimental bond length r, causes the classical dipole moment qr to be equal to the experimental one. [Pg.310]

Raines, R.T. Hansen, D.E. (1988) An intuitive approach to steady-state kinetics. J. Chem. Educ. 65, 757-759. [Pg.234]

Introducing specific length and velocity scales provides a more intuitive approach to nondi-mensionalization. In this section the thermal-energy equation is also included in the analysis. Assuming constant transport properties and a single-component fluid, a subset of the governing equations is derived from Section 6.2 as... [Pg.268]

The statistical thermodynamics analysis of -mers adsorption in a one-dimensional lattice provides an intuitive approach to linear molecules confined in quasi-one-dimensional nanotubes. More elaborated analytical solutions that incorporate nearest and next-nearest-neighbors between fc-mer s ends can be obtained by applying the mapping proposed in the present work. [Pg.663]

It is relatively straightforward to solve the differential equations for the time dependence of the transients in simple cases. However, it is important to understand the physical meaning of why a particular case gives rise to a particular form of solution. In this section we will concentrate on an intuitive approach to this understanding. Once a feel for the subject has been developed, algebraic mistakes will not be made and some complex kinetic schemes may be solved by inspection. [Pg.407]

Our intuitive approach in the use of symmetry methods is admittedly nonrigorous and therefore will be unsatisfactory to purists, but we believe this is the best way to introduce symmetry ideas to the majority of students. Once the student has learned how to use symmetry methods, it will be easier for him to appreciate more formal and rigorous treatments. [Pg.280]

It is truly remarkable that these rather simple models are able to predict these relatively complex phases. The existence of a nematic phase appears to be likely from a purely intuitive approach but the existence of a smectic phase, at least for such a simple model, is by no means intuitive. These results have important implications for the understanding of other layer structures such as LB films. [Pg.145]

VT. Dawn M. Wakeley and Hans M JI de Grys, "Developing an Intuitive Approach to Moles," /. Chem. Educ., Vol. 77,2000,1007-1009. [Pg.81]

Blackburn 7 recently noted that many of our most talented young people are "turned off" from science as a solution, he proposed that we recognize the validity of a more sensuous-intuitive approach to nature, treating it as complementary to the classical intellectual approach. [Pg.199]

Due to the nature of the product portfolio considered in the pilot application, it was possible to create the clusters rather intuitively without using a formalized methodology such as cluster analysis. When needed clustering techniques such as those used to form manufacturing cells could be adapted to cluster a more complex product portfolio (see Selim et al. (1998) for a review of different clustering techniques). An application of cluster analysis to aggregate demand locations is reported in Muller (1983, pp. 188-190). An intuitive approach similar to the one proposed above was also used by Nickel et al. (2005, pp. 168-170) for an application in steel industry. [Pg.170]

The technique most commonly used for objective evaluation of daytime sleepiness is the Multiple Sleep Latency Test (MSLT). It is composed of a series of naps during which subjects are asked not to resist sleep. The speed of falling asleep on tests across time is the chief outcome of the MSLT, which has achieved widespread acceptance because of its simple, intuitive approach to sleepiness. Hence, the greater levels of sleepiness are indicated by more rapid sleep onsets. Furthermore, the MSLT provides several opportunities to test for sleep-onset rapid-eye-movement (REM) episodes, the primary diagnostic sign of narcolepsy. [Pg.12]

In this section we show how the general form of Renner-Teller interaction matrices can be obtained at any order in the phonon variables and with electron orbital functions of different symmetry (p-like, < like, /-like, etc.). For this purpose, we use an intuitive approach [18] based on the Slater-Koster [19] technique and its generalization [20] to express crystal field or two-center integrals in terms of independent parameters in the tight-binding band theory [21] then we apply standard series developments in terms of normal coordinates. [Pg.47]

In summary, I would like to state that this book will not help all students taking organic chemistry. Many students seem to have an intuitive approach to organic synthesis problems. Other students will find this book very helpful. It is for these students that this book is written. With these students in mind, 1 feci that the advantages of this book far outweigh its disadvantages. [Pg.323]

Regarding the phase behavior, it is clear that the state with the lowest free energy will be achieved. Detailed calculations are however complicated and for the time being a simple, intuitive approach will be employed. Winsor [22] explained qualitatively the phase behavior in terms of the Rt ratio, which compares the surfactant oil interactions to those between surfactant and water. Two ratios are, however, needed to describe the behavior of a system [12], One of them is the ratio Ri... [Pg.193]

It is also possible to derive the Reynolds number by dimensional analysis. This represents a more analytical, but less intuitive, approach to defining the condition of similar fluid flow and is essentially independent of particular shape. In this approach, variables in the Navier-Stokes equation (relative particle-fluid velocity, a characteristic dimension of the particle, fluid density, and fluid viscosity) are combined to yield a dimensionless expression. Thus... [Pg.36]


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