The FT-IR spectrum of as-prepared CuS catalyst is shown in Figure 7.
The CuS nanostructures were prepared by hydrothermal method by using copper nitrate as a copper source and sodium thiosulphate as a sulfur source in the presence of CTAB as surfactant at 150[degrees]C.
Leskela, "Growth of CuS thin films by the successive ionic layer adsorption and reaction method," Applied Surface Science, vol.
For the NSCRS, if [R.sup.cu.sub.m] > [R.sup.bs.sub.m], the cooperation of CUs can provide a higher transmission rate for the PU and, then, an incentive time is to be given to CUs as a reward by the mth PU.
Owing to a higher data transmission capability in a symbiotic approach, an incentive time can be yielded for the case of effective cooperation from CUs to the mth PU.
Then, the remaining time of the mth PU, [[epsilon].sub.m][t.sub.m], is given to CUs as an incentive time.
We assume that the target spectral efficiency R =1 bps/Hz, and there is a total of 4 CUs (K=4), [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (i [not equal to] j), which means that the channel gain between the source node to its relay node in each CU is better than the interference channels, and [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (i [not equal to] j), which means that the channel gain between the relay node to its destination node in each CU is better than the interference channels.
From our analysis in the above section, we note that the presence of more CUs in wireless networks will cause more interference at CU 1, Fig.
In terms of empirical evidences on the significance of dominated behavior among CUs, Flannery (1974) seems to have been the first study attempting to classify CUs as saver-dominated, borrower-dominated or neutral.
Smith (1986) tested the variant objective functions of CUs (i.e., saver- or borrower- oriented or neutral) by relying on comparative static results obtained by Smith (1984).
This data shown below in Table 3 shows CUs usually enjoy lower delinquencies than banks (Federal Deposit Insurance Corporation, 2010c) (National Credit Union Association, 2010d).
CUs have enjoyed a competitive edge over banks because of their higher satisfaction ratings.