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This seasonal isolation increases construction and day-to-day supply costs well above the already high per capita cost of SDWS.
A Sample of SDWS Challenges Resources/financial Technical capacity management capacity Managerial capacity Operations skills Accounting Preventative gap (a) skills gap (c) maintenance planning skills gap (a) High rate of High construction Rapid governance operator turnover and operation cost staff (b) per capita (b) turnover (c) Limited access to Lack of contingency Acute political external experts and fund for pressures to technical support emergencies (b) minimize user (a) fees (b) Low staffing numbers Low revenue Conflicting and existing staff generation (d) priorities for fill multiple roles local government (b) investment (a) (a) (Montana Water Center 2005).
Dependences of transmission coefficients of propagating microwaves in SDWs versus frequency are calculated in 8 GHz-80 GHz frequency range in this paper.
Several models of non-periodical SDWs are discussed in this chapter.
The analysis of models of SDWs is performed by taking in account density of electrons N, semiconductor electron mobility [mu], effective mass [m.sup.*] and temperature T.
After the analysis of electrodynamical models of non-periodical SDWs it can be concluded, that lower attenuation of EM microwaves could be received in models of waveguides which structure consist of n-SiGe core and n-InSb, TM-15 layers.
The analysis of electrodynamical models of periodical SDWs which structure consist of n-SiGe core and n-InSb-air, TM-15 layers is performed, when densities of electrons are N = [10.sup.19]; [10.sup.20] [m.sup.-3].
Dependences of transmission coefficient on the frequency of [HE.sub.11] mode propagating in models of periodical SDWs are similar to characteristics of the band pass filter (Fig.
Frequency dependences of transmission coefficient of propagated [HE.sub.11] mode in model of periodical SDWs which structure consist of n-GaAs core and n-In[As.sub.1-x][Sb.sub.x]-air, TM-15 layers are presented in Fig.
The attenuation of EM microwaves is obtained in models of SDWs which structure consist of n-SiGe core and n-InSb, TM-15 layers.
The attenuation of EM microwaves in models of SDWs which structure consist of n-GaAs core and n-In[As.sub.1-x][Sb.sub.x], TM-15 layers is -5 dB at frequency range from 25 GHz to 43 GHz and temperature T = 200 K.
These changes of structures of models of periodical SDWs are presented in Fig.
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