基于HVS的数字水印技术研究

本文对HVS技术以及数字水印技术进行了论述研究,并将其HVS技术应用与数字水印技术当中,仿真结果表明,水印具有良好的性能。     

人力资本对技术创新的作用:述评与展望

人力资本对技术创新的作用包括理论和实证两个方面,其中实证方面分为人力资本存量与技术创新、人力资本结构与技术创新、人力资本与技术创新的门槛效应3个角度对现有文献进行述评,最后在分析现有研究不足的基础上提出了未来可能的研究方向。     

陕西吸引外商直接投资的现状及对策浅析

近年来,陕西在吸引外商直接投资方面做了大量的工作,利用外商直接投资取得了显著成就,但是还有很多因素对陕西利用外商直接投资的发展形成制约。本文首先对陕西吸引外商直接投资的现状进行了分析,在此基础上分析了制约陕西利用外商直接投资的几个主要因素,并提出相应的对策建议。     

一种高效率的开关稳压电源设计

本开关稳压电源采用高效率的开关控制芯片MAX1771加MOS管实现BOOST升压电路,可大大提高效率,并具有步进调整电压和过流保护功能,整体系统电路构成简单,具有很高的稳定性和可靠性。     

1-丁基-3-甲基咪唑氯盐-水和2，6-二甲氧基苯酚混合物中分子相互作用的衰减全反射红外光谱研究

Molecular interactions of the ternary mixtures of 1-butyl-3-methylimidazolium chloride ([C₄C₁im]Cl)-water-2,6-dimethoxyphenol (2,6-DMP, a phenolic monomer lignin model compound) were investigated in comparison with the [C₄C₁im]Cl-water binary systems through attenuated total reflection infrared spectroscopy. Results indicated that the microstructures of water and [C₄C₁im]Cl changed with varying mole fraction of [C₄C₁im]Cl (^xIL) from 0.01 to 1.0. This change was mainly attributed to the interactions of [C₄C₁im]Cl-water and the self-aggregation of [C₄C₁im]Cl through hydrogen bonding. The band shifts of C-H on imidazolium ring and the functional groups in 2,6-DMP indicated that the occurrence of intermolecular interactions by different mechanisms (i.e., hydrogen bonding or π-π stacking) resulted in 2,6-DMP dissolution. In the case of ^xIL=0.12, the slightly hydrogen-bonded water was fully destroyed and [C₄C₁im]Cl existed in the form of hydrated ion pairs. Interestingly, the maximum 2,6-DMP solubility (238.5 g/100 g) was achieved in this case. The interactions and microstructures of [C₄C₁im]Cl-water mixtures influenced the dissolution behavior of 2,6-DMP.