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A new homologous series of isoflavone-based ethers,7-(4-bromoalkyloxy)-3-(4’-decyloxyprienyl)-4H-1-benzopyran-4-ones were synthesized and characterized.The mesomorphic properties of all homologues were investigated by differential scanning calorimetry(DSC) and polarizing optical microscopy(POM).Enantiotropic smectic A(SmA) phase was observed for all homologues.The structure-property study was carried out by comparing the mesomorphic behavior of the homologues with those previously reported analogues.The bromine atom from the alkyloxy side chain of the benzene ring fused to the heterocyclic moiety was found to be capable of changing the mesomorphic properties. 相似文献
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ARIMA Akito 《中国科学:物理学 力学 天文学(英文版)》2011,(2)
We summarize the history and our present understanding of nuclear magnetic moments and Gamow-Teller transitions.The roles of configuration mixing,meson exchange currents and relativistic effects are examined.Experimental evidence for the importance of tensor correlations is also discussed. 相似文献
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S. Banerjee S. N. Ganguli A. Gurtu P. K. Malhotra R. Raghavan A. Subramanian K. Sudhakar M. M. Agarwal T. K. Chatterjee J. M. Kohli J. P. Lamba I. S. Mittra J. B. Singh P. M. Sood Dev Anand P. V. K. S. Baba G. L. Kaul Y. Prakash N. K. Rao G. Singh R. Hamatsu T. Hirose S. Kitamura T. Yamagata Bombay Collaboration Chandigarh Collaboration Jammu Collaboration Tokyo Collaboration 《Zeitschrift fur Physik C Particles and Fields》1986,32(2):163-170
A study of \(\bar np\) annihilations with \(\bar n\) momentum between 0.5 and 0.8 GeV/c is presented. The search fors-channel resonances in \(\bar np\) annihilations reveal possibly two narrow structures in the odd pions final state. Inclusiveρ 0 andf 0 cross sections in \(\bar np\) annihilations have been estimated to be 9.0±0.6 mb and 3.4±0.6 mb respectively. Longitudinal and transverse momentum distributions for inclusiveρ 0 production have been presented. A study of resonance production in exclusive final state revealsρ 0 production to be dominant in the odd pion final states andρ +,ω 0 productions are most important for the even pion final states. Theπ + π ? effective mass spectra in the backward and the forward directions in the \(\bar np\) c.m. system have been examined for a possible ?-ω interference effect. 相似文献
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Numerical simulations based on three-dimensional discrete element model (DEM) are conducted for mono-disperse, binary and ternary systems of particles in a fluidized bed. Fluid drag force acting on each particle depending on its size and relative velocity is assigned. The drag coefficient corresponding to Ergun’s correlation is applied to the system of fluidized bed with particle size ratios of 1:1 for the mono-disperse system, 1:1.2, 1:1.4 and 1:2 for the binary system and 1:1.33:2 for the ternary system b... 相似文献
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