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The electronic structure of Nb_3Al/Nb_3Sn, a new test case for flat/steep band model of superconductivity
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作者 Yanlong Ding Shuiquan Deng Yong Zhao 《Journal of Modern Transportation》 2014年第3期183-186,共4页
In this work, we choose Nb3Al/Nb3Sn as a new test case for flat/steep band model of superconductivity. Based on the density functional theory in the generalized gradient approximation, the electronic structure of Nb3A... In this work, we choose Nb3Al/Nb3Sn as a new test case for flat/steep band model of superconductivity. Based on the density functional theory in the generalized gradient approximation, the electronic structure of Nb3Al/ Nb3Sn has been studied. The obtained results agree well with those of the earlier studies and show clearly fiat bands around the Fermi level. The steep bands as characterized in this work locate around the M point in the first Brillouin zone. The obtained results reveal that Nb3Al/Nb3Sn fits more to the "Flat/steep" band model than to the van-Hove singularity scenario. The fiat/steep band condition for superconductivity implies a different thermodynamic behavior of superconductors other than that predicted from the conventional BCS theory. This observation sets up an indicator for selecting a suitable superconductor when its large-scale industrial use is needed, for example, in superconducting maglev system or ITER project. 展开更多
关键词 Nb3Al/Nb3Sn - Electronic structure - flat/ steep band model FIRST-PRINCIPLE
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语音合成集成电路中掩模ROM的解决方案
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作者 米丹 孟飚 常昌远 《现代电子技术》 2007年第22期148-150,153,共4页
在语音合成集成电路(IC)中,需要存储大量的程序和语音数据,因此内存储器的集成度、读取速度及可靠性成为影响一款芯片生产成本和性能参数的关键指标。存储器有很多分类,掩模只读存储器(ROM)以其较高的集成度和较低的成本在中低档消费类... 在语音合成集成电路(IC)中,需要存储大量的程序和语音数据,因此内存储器的集成度、读取速度及可靠性成为影响一款芯片生产成本和性能参数的关键指标。存储器有很多分类,掩模只读存储器(ROM)以其较高的集成度和较低的成本在中低档消费类语音合成IC中有着较为广泛的应用。给出一种语音合成IC中掩模ROM的解决方案,分别介绍3个组成部分:存储单元阵列、地址译码器和读出放大器的设计实现。采用该方案可以有效提高掩模ROM的集成度、读取速度及可靠性,有效降低语音合成IC的生产成本、提高其性能和市场竞争力。 展开更多
关键词 掩模ROM flat-cell结构 存储单元阵列 地址译码器 读出放大器
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First-Principles GGA+U Study of Intermediate-Band Characters from Zn_(1-x)M_xO(M=3d Transition-Metal) Alloys Suitable for High Efficiency Solar Cell
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作者 吴孔平 鲁开林 +6 位作者 蒋建彗 顾书林 汤琨 叶建东 朱顺明 张荣 郑有炓 《Communications in Theoretical Physics》 SCIE CAS CSCD 2015年第6期769-776,共8页
The electronic structure characters are calculated for the Zn1-∞MxO alloys with some Zn atoms in ZnO substituted by 3d transition-metal atoms (M), in order to find out which of these alloys could provide an interme... The electronic structure characters are calculated for the Zn1-∞MxO alloys with some Zn atoms in ZnO substituted by 3d transition-metal atoms (M), in order to find out which of these alloys could provide an intermediate band material used for fabricating high efficiency solar cell. Especially, among of these alloys, the electronic structure character and optical performance of Zn1-xCr∞ 0 alloys clearly show an intermediate band filled partially and isolated from the VB and the CB in energy band structure of ZnO host, and the intermediate band characters can be preserved with increasing Cr concentrations no more than 8.33% in Zn1-xCrxO alloys, at the same time, the ratio 0.52 of Eg^FC to EVE in Zn1-xCrxO, (x = 4.16%) alloy is closest to the optimal ratio of 0,57. Besides, compared to the ZnO, the optical absorption does indicate a great improved absorption below the calculated band gap of the ZnO and an enhancement of the optical absorption in the whole solar spectral energy range. 展开更多
关键词 Zn1-∞MxO alloys intermediate band photovoltaic materials electronic structure high efficiencysolar cell
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大悬臂扁平多室箱梁结构的空间分析 被引量:3
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作者 兰昌荣 杨允表 《上海公路》 2010年第2期40-43,13,共4页
由于城市高架桥梁建筑景观的需要,大悬臂弧形扁平多室箱梁断面在设计中应用越来越多。经典的梁单元分析方法不能全面分析此类结构的力学性能,必须借助更为精细的有限元三维仿真分析法。以宁波机场路高架的一联3×30m标准段箱梁结构... 由于城市高架桥梁建筑景观的需要,大悬臂弧形扁平多室箱梁断面在设计中应用越来越多。经典的梁单元分析方法不能全面分析此类结构的力学性能,必须借助更为精细的有限元三维仿真分析法。以宁波机场路高架的一联3×30m标准段箱梁结构为例,利用ANSYS的三维实体单元对整个结构进行了仿真模拟,仿真分析得到了经典梁单元分析法所不能得到的计算结果,为标准段箱梁结构的设计提供了必要的分析依据。 展开更多
关键词 预应力混凝土 大悬臂扁平多室箱梁 结构仿真 有限元方法
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