Sheng model

A model on a different basis more in consideration of CPs was proposed by Sheng [178], found to apply to highly doped CPs. It assumes conduction between the metallic islands within CPs discussed above, and yields the following temperature relation  

A model found to correctly predict the steep increase in conductivity of P(Ac) on doping and dependence of P(Ac) on temperature is that proposed by Kivelson [180, 181]. In its essence, this intersoliton hopping model applied primarily to P(Ac) proposes isoenergetic hopping of electrons from a neutral soliton of one chain to a charged soliton at a neighboring chain via tunnelling. It is able to account well for 

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Figure 3.12 illustrates the Sheng model explaining the interruption (barriers) between highly conducting areas. 

Where Tq and are known as Mott parameters and depend on the type of counterion used. To understand the conduction mechanism below 100 K, the Sheng model can be applied to the analysis of the temperature dependence of polypyrrole conductivity [234]. This model takes into consideration both hopping and... 

In practical application, the Mott VRH model is found to be widely applied to moderate doping levels and moderate temperatures for all CPs, whilst for high doping levels, the Sheng model (or variations thereof) is found to work reasonably well. The Kivelson model is applied in a very limited sense to P(Ac) within narrow doping and temperature limits as described above. We now discuss some experimental correlations. 

Fig. 16.11. Model of the association of Fyn kinase with the NMDA receptor The NMDA receptor is shown as a tetramer of NRl and NR2 subunits. The C-terminal tail of NR2 interacts with PDZ2 of PSD-95. The protein tyrosine kinase Fyn is assumed to bind to PDZ3 of PSD-95 via its SH2 domain. Fyn also is anchored to the ceU membrane via its myristoylated N-terminus. GK guanylate kinase domain of PSD-95. According to Sala and Sheng (1999), with permission.

Chiou, C. T., G. Sheng, and M. Manes, A partition-limited model for the plant uptake of organic contaminants from soil and water , Environ. Sci. Technol., 35, 1437-1444 (2001). 

Han, Z., and Sheng, X. (1996). Gold deposits in Southwest Guizhou and their metallogenetic model. Guizhou Geol. 13, 46—52. 

Thomas J, Wang J, Takubo H, Sheng J, de Jesus S, Bankiewicz KS (1994) A 6-hydroxydopamine-induced selective parkinsonian rat model further biochemical and behavioral characterization. Experimental Neurology 72(5 159-167. 

Neither of the above theories takes the macrostructure of carbon black into account in any quantitative way, although in practice this is crucial in selecting a material for a particular application. Sheng (1980) was, however, able to develop the first of these theories and extend its range of applicability. He noted the well-established model for hopping conduction by tunnelling... 

Ming Sheng Luo, Two stage coprocessing of coal with model and commingled waste plastics mixture. Fuel Processing Technology, 59, 163-187 (1999). 

Davis et al. have since jjerformed very long MC and isothermal MD simulations on Arij, which demonstrate that a coexistence between a solidlike and a liquidlike cluster occurs over a finite range of temperatures. Their results can be used to reconcile previous MC results, but are also important for several other reasons. One of these is direct supjjort of the canonical two-phase model, which is not directly provided—for a system of so few particles —by corresjjonding isoergic simulations. A more complete description of the calculations of Davis et al. follows, but first we discuss in detail the calculations of Etters and Kaelberer, Quirke and Sheng, and Nauchitel and Pertsin. 

Saydoff JA, Olariu A, Sheng J, Hu Z, Li Q, Garcia R et al (2013) Uridine prodrug improves memory in Tg2576 and TAPP mice and reduces pathological factors associated with Alzheimer s disease in related models. J Alzheimers Dis 36 637-657... 

Sheng P., 1991. Consistent modeling of electrical and elastic properties of sedimentary rocks. Geophysics 56, 1236-1243... 

Sheng and Zhang [68] proposed a model that predicts, with suitably... 

Huang, W., Yu, H., Sheng, R., Li, J., and Hu, Y. (2008) Identification of pharmacophore model, synthesis and biological evaluation of N-phenyl-l-arylamide and N-phenylbenzenesulfonamide derivatives as BACE 1 inhibitors. Bioorganic e[ Medicinal Chemistry, 16, 10190-10197. 

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