Density significance

One-photon excitation has lunitations due to the unwanted out-of-focus fliiorophore absorption and bleaching, and light scattering. These drawbacks can be circumvented if multiphoton excitation of the fliiorophore is used. Since it increases with the nth power of the photon density, significant absorption of the exciting light will only occur at the focal point of the objective where the required high photon density for absorption is reached. Consequently, only... 

The effect of buoyancy in gases released into the air can be related either to the difference in the molecular weights or to the difference in temperature. Jb characterize the buoyancy for gases with a molecular density significantly different from the density of air, Elterman proposed a parameter P, with units... 

Secondly, correlations in the initial state can lead to experimental orbital momentum densities significantly different from the calculated Hartree-Fock ones. Figure 3 shows such a case for the outermost orbital of water, showing how electron-electron correlations enhance the density at low momentum. Since low momentum components correspond in the main to large r components in coordinate space, the importance of correlations to the chemically interesting long range part of the wave function is evident. 

The small energy difference between Zn + 2H2O and Zn(OH)2 + H2 is responsible for the energy efficiency of the process. However, the fact that two H2OS are necessary to produce one H2 lowers the storage density significantly. 

A substantial dependence of the induced absorption on density has been seen in liquid nitrogen when high pressure was applied to the liquid [252], Furthermore, with increasing density, a shift of the peak absorption to higher frequencies is observed while the low-frequency profile is not much affected by increasing density, significantly increased absorption is... 

In addition, deformation densities provide further guidance on how to recognize the presence of chemical bonds and lone pairs as special features of the total density. Significant early suggestions on how to achieve a chemically meaningful partitioning were proposed by Berlin [183] and by Daudel [184]. 

Schottky defects lower the density of the crystal but Frenkel defects do not change the density significantly. 

No significant variation in pore diameter was observed in moderately doped SiC substrates with an increase in current density from 10 to 60 m A cm-2. However, the pore density increased by more than one order of magnitude. The lowest pore density of 3 x 107cm-2 was obtained at the anodization current density of 10 mA cm-2 (Figure 2.11). An increase of the current density to 20 mA cm-2 led to an increase of the pore density to 1 x 108 cm-2. A further doubling of the current density (up to 40 mA cm-2) formed a porous network with a pore density of 1.5 x 108 cm-2, and then, the pore density does not depend on current density significantly. 

Commonly used water-immiscible solvents in industrial-scale processes include alcohols (isobutanol, -butanol), ketones (particularly methyl isobutyl ketone), acetates (butyl, ethyl, isopropyl), hydrocarbons (toluene, hexanes), and methylene chloride. These solvents are inexpensive, readily available, and exhibit physical properties of low viscosity and density significantly different from water. Common water-miscible solvents are the alcohols (particularly methanol). For laboratory-scale processes, the selection is greater since selection is not constrained by economics. Craig and Sogn (16) have prepared an extensive compilation of such solvents. 

Lean homogeneous hydrogen-air mixtures bum at very low temperatures causing very high efficiencies and minimal NO -emissions, but on the other hand cutting down the engines power density significantly. 

Underground gas even at great depths has density significantly less than 1 mg-cm 3 and tend to migrate to the surface. In a case of the presence along the way of traps (dead ends), they are capable of forming individual accumulations, isolated pools. 

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