Memory, effect

Memory of the a-form crystals in SPS is maintained, at least for a short time, in a wide temperature range above the melting temperature. De Candia et al. [81] suggested that it could be related to the existence of small agglomerates of chains in the mesomorphic form, which dissolve under very long annealing time. 

A comparison between the X-ray diffraction intensity of oriented samples of SPS in the mesomorphic form and the infrared spectra indicates that the mesomorphic form consists of small and imperfect crystals of the a crystalline form [8], 

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Zwanzig R 1961 Memory effects in irreversible thermodynamics Phys. Rev. 124 983... 

Kemblowski, Z. and Petera, J., 1981. Memory effects during the flow of thixotropic fluids in pipes. Rheol. Acta 20, 31 1-323. 

For the experiments referred to in Fig. 4.25(a), McEnaney was able to show, on reasonable assumptions, that the stress induced by adsorption swelling should be sufficient to fracture the carbon over short distances. A memory effect in the carbon network would lead to trapping of some adsorbed carbon tetrachloride molecules during the desorption run. 

There are problems in use of the frit nebulizer. Memory effects tend to be severe, and each sample needs to be followed by several wash-outs with clean solvent before the pores of the frit become free of residual sample. Biological samples frequently contain detergent-like materials, and... 

Infrared Spectrophotometry. The isotope effect on the vibrational spectmm of D2O makes infrared spectrophotometry the method of choice for deuterium analysis. It is as rapid as mass spectrometry, does not suffer from memory effects, and requites less expensive laboratory equipment. Measurement at either the O—H fundamental vibration at 2.94 p.m (O—H) or 3.82 p.m (O—D) can be used. This method is equally appticable to low concentrations of D2O in H2O, or the reverse (86,87). Absorption in the near infrared can also be used (88,89) and this procedure is particularly useful (see Infrared and raman spectroscopy Spectroscopy). The D/H ratio in the nonexchangeable positions in organic compounds can be determined by a combination of exchange and spectrophotometric methods (90). 

After Flarvest. How do the memory effects shown by the other crops compare with those of winter wheat Winter wheat did not show a memory effect after one year, but oilseed rape does seem to do so. Researchers of the Agricultural Development and Advisory Service found that nitrate production by microbes in the soil after a rape crop increased with the amount of fertilizer given to the crop (R. Sylvester-Bradley, personal communication). One reason may lie in this crop s habit of shedding its leaves as harvest approaches, which means that the microbes in the soil get early access to these residues. This habit might contribute to the apparently smaller efficiency of this crop in using nitrogen fertilizer. The crop may be just as efficient as winter wheat at taking up the fertilizer but drops... 

Other spectral densities correspond to memory effects in the generalized Langevin equation, which will be considered in section 5. It is the equivalence between the friction force and the influence of the oscillator bath that allows one to extend (2.21) to the quantum region there the friction coefficient rj and f t) are related by the fluctuation-dissipation theorem (FDT),... 

The first element, dynamic dilution, provides a reproducible sample for each panelist. The system must minimize the loss of the odorant to the walls of the delivery apparatus, provide clean dilution air of odor-free quality, maintain a constant dilution ratio for the duration of a given test, and have no memory effect when going from high to low concentrations or switching between odorants of different character. The type of mask or port and the delivery flow rate have been found to influence the response of panelists in determining odor threshold and intensity. 

New, unused columns were used to minimize the memory effects known not only with silica gel active packings, but also with PS/DVB materials (13). One single column of each kind (7.5, 7.8, 8, or 10 mm in diameter and 250 or 300 mm in length) was used in each series of experiments. 

C.C. Cornells, Investigation of Lead Azide Memory Effect , Technical Report No 226, Mason and Hanger-Silas Mason Co, Inc, (1974)... 

Burshtein A. I., Naberukhin Yu. I. Phase-memory effects in the theory of spectral line broadening in gases. Sov. Phys. JETP. 25, 799-805 (1967) [ZhETF, 52, 1202-11 (1967)]. 

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