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Articles by Fan Li
Total Records ( 3 ) for Fan Li
  Guangqian Wen , Jiangnan Xiao , Zizheng Cao , Fan Li , Lin Chen and Jianjun Yu
  In a baseband direct-detected optical orthogonal frequency division multiplexing (DDO-OFDM) system, when the total transmitted power is constant, increasing the power of pilots can improve channel estimation accuracy but also increases the interference from them. Therefore, in order to obtain a best performance, the optimal ratio of pilot-to-total power should be given. In this letter, we compared different systems with different pilot power to total power ratios by simulations. The results showed that the power allocation with an optimal pilot power to total power ratio was found and the optimal power allocation obtained the most accurate channel estimation and the highest receiver sensitivity.
  Binglian Bai , Haitao Wang , Peng Zhang , Songnan Qu , Fan Li , Zhixin Yu , Beihong Long and Min Li
  The synthesis and mesomorphic behaviour are reported of a new series of dimers containing 4-nitrobenzohydrazide and azobenzene groups as the mesogenic units. These non-symmetric liquid crystal dimers are found to exhibit a monolayer smectic A phase (SmA1). Lateral hydrogen bonding and strong dipole-dipole interactions are shown to be the major driving forces for the formation of the SmA1 phase. The present study indicates that the intermolecular interactions and thus the mesophase morphology of the liquid crystal dimers can be controlled by the appropriate selection of the molecular fragments capable of forming H-bonds.
  Haitao Wang , Renfan Shao , Chenhui Zhu , Binglian Bai , Chengbo Gong , Peng Zhang , Fan Li , Min Li and Noel A. Clark
  Dimeric hydrazide derivatives with long terminal alkoxy chains, i.e. α,ω-bis[N-(4-hexadecyloxybenzoyl)-N’-(benzoyl-4’-oxy)hydrazine]alkanes (C16. n. C16, C16 indicates the terminal hexadecyloxy chain; n = 3, 5, 6, 10, indicates the number of the carbon atoms in the spacer) were synthesised. The liquid crystalline properties were investigated by differential scanning calorimetry, polarising optical microscopy and X-ray diffraction. The dimers with shorter spacer (C16. n. C16, n = 3, 5, 6) exhibit enantiotropic smectic phases, whereas C16.10.C16 with the longest spacer is non-mesomorphic. Furthermore, the smectic structure is parity dependent, i.e. C16.3.C16 and C16.5.C16 with odd spacer exhibit a monolayer smectic A phase, whereas C16.6.C16 with even spacer exhibits a monolayer smectic C phase, in which the incompatibility between the terminal chains, mesogenic groups and the spacers is considered to be the driving force. The results are compared with those for the terminally nitro-substituted series, α,ω-bis[N-(4-nitrobenzoyl)-N’-(benzoyl-4’-oxy)hydrazine]alkanes (Nn), which exhibit an intercalated smectic A phase. Temperature-dependent IR spectroscopic analysis on these two kind of dimers suggests that intermolecular hydrogen bonding, as well as the dipole-dipole interaction arising from the strong polar substituents (-NO2) synergistically drives the intercalated structure of Nn. Although hydrogen bonding exists in the monolayer smectic phase of C16. n. C16, microphase segregation is in favour of the monolayer smectic structure, preventing the formation of an intercalated structure.
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