Mechanical 434 INDEX

DSPC distearoyl phosphatidylcholine DPPG dipalmitoyl phosphatidylglycerol MI mechanical index... 

Catalano, O., Sandomenico, F., Raso, M.M., Siam, A. Low mechanical index contrast-enhanced sonographic findings of pyogenic hepatic abscesses. Amer. J. Roentgenol. 2004 182 447-450... 

Table 6. Physico-mechanical indexes of stabilized polycaproamide fibre before and after 24-hours irradiation by mercury-quartz lamp...

The reason of increased photooxidative stability is not only stabilizing activity of bis-aroilenbenzimidazoles derivatives but also the effect of these compounds on supermolecular structure of polymer matrix. As it is seen from the Table 6 physico - mechanical indexes of polymer do not practically depend on the method of additives introduction. Data of Table 6. agree with data of Table 5. In all cases the greatest degree of conservation of polymer initial properties is registered at the concentration of XLY compound - 1 mass %. 

CardsJ methods. Mechanical sorters or computers can be used to search through mechanized indexes such as the IBM cards of the ASTM. 

We took the rock samples from the drilling core of deep monitoring profile (II-IT) and rock under ground surface within 5 m depth in Baitupo (Fig. 2). By means of X-ray diffraction, Scanning Electron Microscopy (SEM) spectral analysis, microscopic and rock mechanics test, we got the mineral composition, chemical elements, microstructure and mechanical strength of all rock samples. Then, the paper analyze the relationship between the rock mechanics indexes and mineral composition. 

Table 2. Statistical relationship between the physical and mechanical indexes and w.

ANALYSIS OF PHYSICAL AND MECHANICAL INDEXES BEFORE AND AFTER SILICIFIED... 

Through analysis of the indoor soil tests from original soil sample, it shows the variation characters of physical and mechanical deterioration of natural loess and silicified loess as physical indexes varied a little, mechanical indexes has a prominent improvement. The test result as Table 4. The essence is the microstructure differences between natural loess and silicified loess reflect on the engineering properties of macroscopic reaction. The following contents analyses the underlying causes of the changes of indexes, such as anti-shearing, anti-compression, anti-osmotic. 

The high-strength fiber NM-SO [32] with mechanical indexes equal to those of Kevlar, is prepared from isotropic solutions of an aromatic polyamide ester... 

The strength of PBT fibers can attain 4.2 GPa with a high thermal stability characterized by preservation of the mechanical indexes up to 370°C [54]. 

The interactions of microbubbles with US waves are complex. The bubble response is strongly dependent on the acoustic power (amplitude) of the in-sonating signal, which is indicated on the US scanner as the mechanical index (MI). When a microbubble is exposed to an oscillating acoustic signal, it undergoes alternate expansion and contraction (resonance). At very low acoustic power (MI linear behaviour) and the frequency of the scattered signal is unaltered. 

More recently Andrews and Juzeliunas [6, 7] developed a unified tlieory that embraces botli radiationless (Forster) and long-range radiative energy transfer. In otlier words tliis tlieory is valid over tire whole span of distances ranging from tliose which characterize molecular stmcture (nanometres) up to cosmic distances. It also addresses tire intennediate range where neitlier tire radiative nor tire Forster mechanism is fully valid. Below is tlieir expression for tire rate of pairwise energy transfer w from donor to acceptor, applicable to transfer in systems where tire donor and acceptor are embedded in a transparent medium of refractive index ... 

The symbols X and denote the quantum mechanical coordinates of the nuclei and electrons, respectively. The index p runs over electronic structures and y over geometries. 

Molecular descriptors must then be computed. Any numerical value that describes the molecule could be used. Many descriptors are obtained from molecular mechanics or semiempirical calculations. Energies, population analysis, and vibrational frequency analysis with its associated thermodynamic quantities are often obtained this way. Ah initio results can be used reliably, but are often avoided due to the large amount of computation necessary. The largest percentage of descriptors are easily determined values, such as molecular weights, topological indexes, moments of inertia, and so on. Table 30.1 lists some of the descriptors that have been found to be useful in previous studies. These are discussed in more detail in the review articles listed in the bibliography. 

Computed optical properties tend not to be extremely accurate for polymers. The optical absorption spectra (UV/VIS) must be computed from semiempiri-cal or ah initio calculations. Vibrational spectra (IR) can be computed with some molecular mechanics or orbital-based methods. The refractive index is most often calculated from a group additivity technique, with a correction for density. 

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