信息存储的容量不断增大才能满足信息社会高速发展的需求。要提高磁信息存储的容量,就必须不断减小用于记录数据信息位的磁性颗粒的尺寸,但当尺寸减小到一定程度时,由于超顺磁效应将影响磁信息信息位的稳定性,所以必须开发新型高密度磁...信息存储的容量不断增大才能满足信息社会高速发展的需求。要提高磁信息存储的容量,就必须不断减小用于记录数据信息位的磁性颗粒的尺寸,但当尺寸减小到一定程度时,由于超顺磁效应将影响磁信息信息位的稳定性,所以必须开发新型高密度磁记录技术。目前,商用硬盘的磁记录技术正从传统的水平记录技术向垂直记录技术过渡,但正如业内人士指出那样,为了应对其它超高密度存储技术,如有机存储、光存储等的挑战,垂直记录技术只是磁信息存储技术向超高密度方向发展的一个"跳板"。展望2011年前后的新技术,希捷提出了"热辅助磁性写入"(heat-assisted magnetic recording)技术,该技术的实质是采用高矫顽力的磁性材料如铁铂合金作为记录介质,在信息写入时通过激光束加热降低信息位翻转场写入信息。而日立存储则提出"图案化介质"(patterned media)技术,在这种技术中,存储数据的信息位宛如"点"一样彼此相互独立,减少相互间的干扰和降低数据信息位损坏的危险。这两种技术都可望将磁信息存储密度提高到1Tbit/平方英寸以上,但是它们的实用化还有许多科学与工程问题需要解决。详细介绍了图案化介质记录技术的工作原理、读写存储系统的设计以及对图案化介质的要求、目前的研究进展。将详细介绍图案化介质的制备技术,并对其它存在的科学与工程问题进行探讨。最后,将介绍电子科技大学在国家自然科学基金重大项目资助下有关图案化介质的研究进展。展开更多
First and Second Law analyses were conducted to evaluate the performance of a closed latent heat thermal energy storage (LHTES) system employing calcium chloride hexahydrate (CaCl2-6H2O).The First and the Second Laws ...First and Second Law analyses were conducted to evaluate the performance of a closed latent heat thermal energy storage (LHTES) system employing calcium chloride hexahydrate (CaCl2-6H2O).The First and the Second Laws of thermodynamics were applied to the system from viewpoint of energy and exergy analyses,respectively. The energy storage tank in the system is neither fully mixed nor fully stratified. It may be considered as semithermal stratified. Experiments that include both charging and discharging periods were performed on sunny winter days in 1996. The energy and exergy variations and the overall energy and exergy efficiencies of the closed LHTES system were calculated for the complete charging and discharging cycle of the selected fifteen clear-sky winter days. Mean energy and exergy efficiencies were found to be 55.20% and 34.83%, respectively.展开更多
文摘信息存储的容量不断增大才能满足信息社会高速发展的需求。要提高磁信息存储的容量,就必须不断减小用于记录数据信息位的磁性颗粒的尺寸,但当尺寸减小到一定程度时,由于超顺磁效应将影响磁信息信息位的稳定性,所以必须开发新型高密度磁记录技术。目前,商用硬盘的磁记录技术正从传统的水平记录技术向垂直记录技术过渡,但正如业内人士指出那样,为了应对其它超高密度存储技术,如有机存储、光存储等的挑战,垂直记录技术只是磁信息存储技术向超高密度方向发展的一个"跳板"。展望2011年前后的新技术,希捷提出了"热辅助磁性写入"(heat-assisted magnetic recording)技术,该技术的实质是采用高矫顽力的磁性材料如铁铂合金作为记录介质,在信息写入时通过激光束加热降低信息位翻转场写入信息。而日立存储则提出"图案化介质"(patterned media)技术,在这种技术中,存储数据的信息位宛如"点"一样彼此相互独立,减少相互间的干扰和降低数据信息位损坏的危险。这两种技术都可望将磁信息存储密度提高到1Tbit/平方英寸以上,但是它们的实用化还有许多科学与工程问题需要解决。详细介绍了图案化介质记录技术的工作原理、读写存储系统的设计以及对图案化介质的要求、目前的研究进展。将详细介绍图案化介质的制备技术,并对其它存在的科学与工程问题进行探讨。最后,将介绍电子科技大学在国家自然科学基金重大项目资助下有关图案化介质的研究进展。
文摘First and Second Law analyses were conducted to evaluate the performance of a closed latent heat thermal energy storage (LHTES) system employing calcium chloride hexahydrate (CaCl2-6H2O).The First and the Second Laws of thermodynamics were applied to the system from viewpoint of energy and exergy analyses,respectively. The energy storage tank in the system is neither fully mixed nor fully stratified. It may be considered as semithermal stratified. Experiments that include both charging and discharging periods were performed on sunny winter days in 1996. The energy and exergy variations and the overall energy and exergy efficiencies of the closed LHTES system were calculated for the complete charging and discharging cycle of the selected fifteen clear-sky winter days. Mean energy and exergy efficiencies were found to be 55.20% and 34.83%, respectively.
