Big Chemical Encyclopedia

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

Articles Figures Tables About

Density of charge

The algorithm leads to computation of the width 2a, and the depths d, dj, dj, d, d , d at six equidistant points along the y -axis of the cross-section of a crack, as well as the surface density of charge m=4 ju c at the crack walls. In its formulation from Fig.3, the algoritlun is adapted to cracks with a constant width. [Pg.688]

The data from Table 2 show that the algorithm developed in allows sizing of different cracks with complex cross-sections and unknown shapes for orientation angles not exceeding 45°. It is seen that the width 2a and the parameter c (or the surface density of charge m=4 r // e at the crack walls) are determined with 100% accuracy for all of the Case Symbols studied. The errors in the computation of the depths dj and di are less than 4% while the errors in the computation of d, dj, d, and d are less than 20% independent of the shape of the investigated crack and its orientation angle O <45°. [Pg.691]

In order to obtain the current consumed during the nucleated relaxation process under a constant potential, we assume that a stationary density of charge (<, ) will be stored in the polymer at the polarization potential E. The storage of these charges is controlled by both conformational relaxation (3r) and diffusion ( processes, so... [Pg.384]

The concentration of the remaining oxidation centered on the relaxed film at any oxidation time is defined by the difference between the density of charge stored in the point at which the film attains an oxidation steady state at the working potential and large polarization times and the charge density stored after a given polarization time [< j(0]-So the diffusion flow of ions is given by... [Pg.389]

The volume density of charge of a given type, Qyj, is dehned as Qyj = ZjFcj. A conductor is always electroneutral that is, in any part of it the combined density of all ions (and other charges, free and locahzed) is zero and hence... [Pg.8]

Figure 16 shows the calculated time-averaged densities of charged (Fig. 16a) and neutral species (Fig. 16b). The SiHJ density is the highest in this case, followed by the SiH density quasineutrality is preserved. It can be clearly seen... Figure 16 shows the calculated time-averaged densities of charged (Fig. 16a) and neutral species (Fig. 16b). The SiHJ density is the highest in this case, followed by the SiH density quasineutrality is preserved. It can be clearly seen...
In case of small density of adsorbed particles if contrasted to the density of charged BSS the adsorption of donors can be accompanied by non-monotonous kinetics change in 4s t) which is caused by fast ASS depletion with subsequent slow BSS recharging (see Fig. 1.10, curve J). The use of typical values of parameters in absorbate-adsorbent systems shows that depletion of donor levels is characterized by the times of the order of seconds whereas the relaxation of charge in BSS takes hours. [Pg.48]

Bioremediation of sites that are contaminated with toxic metals is an important issue in environmental restoration. Bacteria have long been known for their ability to Itake up metals from their immediate environment (Borrok and Fein 2004). The efficiency of bacterial cells in concentrating metals is related to their large surface area-to-volume ratio and high surface density of charge. The cell surfaces of all bacteria are negatively... [Pg.71]

The author believes that these vibrations are caused by changes in the 7sj of the electrode, produced by charging and discharging it, but no convincing proof of this belief could be found in the book by the reviewer. The method is not supposed to afford absolute values of the 7sl but, unfortunately, also the derivatives dy /dq and d ys /dip are not given in customary units q is the surface density of charge on the ribbon, and ip is the potential of the latter. [Pg.58]

Conductivity depends on a number of factors including the number of density of charge carriers (number of electrons, n) and how rapidly they can move in the sample called mobility /a. [Pg.448]

The volume density of charge [per milliliter] at a position within AA BB may be... [Pg.85]

M the moment per sq. cm. in electrostatic units may be expressed more fully in terms of p, the volume density of charge at a distance OB from an imaginary plane drawn somewhere in the non-homo-geneous region between the phases, thus... [Pg.209]

The efficient screening approximation means essentially that the final state of the core, containing a hole, is a completely relaxed state relative to its immediate surround-ing In the neighbourhood of the photoemission site, the conduction electron density of charge redistributes in such a way to suit the introduction of a core in which (differently from the normal ion cores of the metal) there is one hole in a deep bound state, and one valence electron more. The effect of a deep core hole (relative to the outer electrons), may be easily described as the addition of a positive nuclear charge (as, e.g. in P-radioactive decay). Therefore, the excited core can be described as an impurity in the metal. If the normal ion core has Z nuclear charges (Z atomic number) and v outer electrons (v metallic valence) the excited core is similar to an impurity having atomic number (Z + 1) and metalhc valence (v + 1) (e.g., for La ion core in lanthanum metal, the excited core is similar to a Ce impurity). [Pg.214]

In actual practice, however, the equation W/L =k does hold as good as the equation W/L =k, proposed by F.A. Olsen. The constant k is different for each combination of expls. The fact that the relation W/L3 does not fit experimental results, indicates that the sympathetic deton phenomenon depends not only on the weight but also on other factors. These factors might include strength (as mentioned before), detonation velocity, density of charge, sensitivity of receptor, etc... [Pg.396]


See other pages where Density of charge is mentioned: [Pg.686]    [Pg.686]    [Pg.46]    [Pg.48]    [Pg.31]    [Pg.163]    [Pg.269]    [Pg.249]    [Pg.10]    [Pg.65]    [Pg.155]    [Pg.208]    [Pg.379]    [Pg.585]    [Pg.270]    [Pg.271]    [Pg.415]    [Pg.10]    [Pg.143]    [Pg.72]    [Pg.46]    [Pg.40]    [Pg.108]    [Pg.214]    [Pg.101]    [Pg.276]    [Pg.211]    [Pg.35]    [Pg.594]    [Pg.594]    [Pg.594]    [Pg.594]    [Pg.594]    [Pg.594]   


SEARCH



Calculations of charge densities

Charge density of ions

Charge density of polyelectrolytes

Charge density studies of silicates

Charge distribution and electronic density of states

Concept of a smeared out spherically symmetrical charge density

Density of charge carriers

Density of trapped charges

Gradient vector field of the charge density

Influence of the Charge Density

Laplacian of the charge density

Local Density of States and Atomic Charges

Relaxation of Charge Density

Standardization of charge density distributions and relation to experimental data

TOPOLOGY OF THE CHARGE DENSITY

The estimation of net atomic charges from calculated electron densities

Topological Analyses of Charge Densities in Ionic Crystals and Crystal Radii

Topological properties of the charge density

Transferability of charge density parameters among related atoms

© 2024 chempedia.info