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The researches on the structure of water and its changes
induced by solutes are of enduring interests. The changes of the local
structure of liquid water induced by NaCl solute under ambient
conditions are studied and presented quantitatively with some order
parameters and visualized with 2-body and 3-body correlation
functions. The results show that, after the NaCl are solvated, the
translational order t of water is decreased for the suppression of
the second hydration shells around H2O molecules; the tetrahedral
order |q| of water is also decreased and its favorite
distribution peak moves from 0.76 to 0.5. In addition, the
orientational freedom k and the diffusion coefficient D of water
molecules are reduced because of new formed hydrogen-bonding
structures between water and solvated ions. 相似文献
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We propose a two-step quantum secure direct communication (QSDC) protocol with hyperentanglement in both the spatial-mode and the polarization degrees of freedom of photon pairs which can in principle be produced with a beta barium borate crystal. The secret message can be encoded on the photon pairs with unitary operations in these two degrees of freedom independently. This QSDC protocol has a higher capacity than the original two-step QSDC protocol as each photon pair can carry 4 bits of information. Compared with the QSDC protocol based on hyperdense coding, this QSDC protocol has the immunity to Trojan horse attack strategies with the process for determining the number of the photons in each quantum signal as it is a one-way quantum communication protocol. 相似文献
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方夏 《理化检验(化学分册)》2007,43(11):945-946
在稀硫酸溶液中,甲醛对溴酸钾氧化罗丹明B的褪色反应有催化作用,研究了其动力学条件,建立了测定痕量甲醛的动力学分光光度法,该方法的线性范围为0.30~3.00 mg.L-1,检出限为0.15 mg.L-1,该法用于饮料中痕量甲醛的测定,标准加入回收率为95.5%~97.0%,RSD为1.8%~2.0%。 相似文献
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