Big Chemical Encyclopedia

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

Articles Figures Tables About

Work upper boundary

The value in the case of ZD defines polymer drawing beginning, that is, local plasticity zone formation beginning. Therefore, in practice this stress can be assumed as polymer capacity for work upper boundary [1]. [Pg.257]

The existence of metastable states is caused by the activation character of the initial stage of a first-order phase transition. Homogeneous nucleation determines the upper boundary of the liquid superheat and supercooling. The appearance of a viable new-phase nucleus in a metastable liquid is connected with the performance of the work IT. determined by the height of the thermod5mamic potential barrier, which is to be overcome for the subsequent irreversible growth of a new phase. The dimensionless complex W, k T, where kg is the Boltzmann constant and T is the temperature, is the stability measure of the metastable phase. ... [Pg.254]

The upper spatial boundary may be defined in a number of ways. Ideally we would define it as being infinitely far away from the electrode, i.e., a max = +00, such that changes in concentration at the electrode cannot have any effect on the concentration at the upper boundary on the time scale of the experiment. In practice, it transpires that it is not necessary to place the boundary infinitely far away from the electrode in order to meet this condition. Einstein s work on Brownian motion in 1905 [6] demonstrated that in one dimension, the root mean squared displacement of a particle from its starting position. [Pg.33]

PuC, 26 and PuCi 47 while Mulford et al. (1960) and Chikalla (1962) found still higher parameters when the phase contacted graphite. These parameters are compared in Table 75. Work at Los Alamos (Quarterly Status Report, 1962) gave PuCj 41 at 610° and PuCi at 555° for the low-carbon boundary. The upper boundary is assumed to lie at PuCi.5, at least at low temperatures. This phase melts peritectically near 2050° according to Mulford et al. (1960). [Pg.218]

The steam dryer is a stainless steel assembly mounted in the reactor vessel above the steam separator which forms the upper boundary of the wet steam plenum. Vertical guides on the inside of the vessel align the dryer during installation. The steam dryer ring supports the dryer on the dryer support brackets. In many BWR plants, the steam dryer support ring is a cold-formed section made of stainless steel. In other plants, the stainless steel steam dryer support ring was installed in a non-cold-worked condition. [Pg.12]

The curves in Fig. 12 are relatively flat. The pressure drop at the lower boundary is under-predicted and the pressure drop at the upper boundary is over-predicted. The main reason is that the stress field in the slug at the upper and lower boundaries has not been determined accurately as yet. Further research work is being conducted by the authors to determine the stress field in the slug and the wall friction of the slug for different situations (e.g. at the upper and lower boundaries). [Pg.385]

Therefore, simulations can be performed in which the force field is gradually turned on over the system, accumulating work from the computational work supplier, and use the fundamental relationship w > AA to obtain an upper boundary for the free energy variation. This way of proceeding [23] is obviously rather complicated and computationally demanding. [Pg.248]

Preliminary work (10) on the transition from oxidized surface sediment to reduced subsurface sediment in Milltown Reservoir showed that the redox transition occurs in the upper few tens of centimeters. Strong chemical gradients occur across this boundary. Ferrous iron in sediment pore water (groundwater and vadose water) is commonly below detection in the oxidizing surface zone and increases with depth. Arsenic is also low in pore water of the oxidized zone, but increases across the redox boundary, with As(III) as the dominant oxidation state in the reduced zone. Copper and zinc show the opposite trend, with relatively high concentrations in pore water of the oxidized surface sediment decreasing across the redox boundary. [Pg.454]

In this work, we use the confined atoms model, with hard walls, to estimate the pressure on confined Ca, Sr, and Ba atoms. With this approach, we will give an upper limit to the pressure, because it is well known that the Dirichlet boundary conditions give an overestimation to this quantity. By using this approach, we obtain the profiles of some electronic properties... [Pg.2]

In this work I consider the Upper Pleistocene to have begun with the wave known as Riss, or Riss-Wiirm (Eem, last interglacial, etc.), that is, the Siittoian faunal phase, and to have ended by the Palankian phase at the boundary of the Pleistocene and the Holocene. [Pg.114]

To understand how this method works, let us have a look at Fig. 4.81. It involves a tube and in this tube there are two solutions and a boundary between them. Let the electrolyte in the upper compartment be named MR and be at a concentration c. The second (bottom) solution is M R, containing the same anion R, but a different cation, M. ... [Pg.493]

In a recent work [42], Renardy characterizes a set of inflow boundary conditions which leads to a locally well-posed initial boundary value problem for the two-dimensional flow of an upper-convected Maxwell fluid transverse to a domain bounded by parallel planes. [Pg.210]

Two selected rich boundary lines are shown in Figure 1. One is based on the NOa emission goal of the present work of 1.0 g N02/kg of total fuel, and the other is based on 3.0 g NOa/kg of total fuel that has been suggested as a standard for cruise operation. The upper and lower end points of the boundary lines were evaluated for kinetically controlled NOa production in one-dimensional flow with a 10.0-msec dwell time, using 100% jet fuel and 100% hydrogen, respectively. The data for intermediate mixed-fuel composition were interpolated for illustrative purposes. Both of these rich operating boundaries fall to the lean side of the flammability limit for jet fuel alone. [Pg.272]


See other pages where Work upper boundary is mentioned: [Pg.217]    [Pg.116]    [Pg.1675]    [Pg.232]    [Pg.665]    [Pg.32]    [Pg.382]    [Pg.50]    [Pg.164]    [Pg.39]    [Pg.38]    [Pg.202]    [Pg.683]    [Pg.855]    [Pg.35]    [Pg.222]    [Pg.492]    [Pg.498]    [Pg.83]    [Pg.325]    [Pg.100]    [Pg.151]    [Pg.237]    [Pg.246]    [Pg.43]    [Pg.469]    [Pg.107]    [Pg.114]    [Pg.796]    [Pg.194]    [Pg.335]    [Pg.1171]    [Pg.94]    [Pg.520]    [Pg.396]    [Pg.102]    [Pg.69]   
See also in sourсe #XX -- [ Pg.257 ]




SEARCH



Boundary work

© 2024 chempedia.info