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Journal of Landscape Research 2012年第8期4卷 23-26,31页

作者： DONG Qiaofeng LIN Yumin ZHENG Bin Wuhan Modern Urban Agriculture Planning and Design Institure

The paper has introduced characteristics and study status of new rural construction, illustrated the connotation of leapfrog development of new rural construction, and considered that new rural construction is an important measure to solve "three rural" problems. How to conduct new rural construction in urbanization is a critical issue in social and economic development in China. Based on the favorable condition and development mode of current new rural construction, by taking new rural construction of Haiyang Village in Jiangxia District of Wuhan City for example, it has analyzed the leapfrog development in terms of traditional agriculture, villagers' life quality and rural concept, and the inheritance in terms of culture and rural appearance, so as to give enlightenments to new rural construction in the future.

关键词： New rural construction leapfrog Inheritance

THE leapfrog EFFECTS OF WIRELESS NETWORKS FOR SMES:PRELIMINARY FINDINGS FROM A COMMUNITY HOSPITAL

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THE LEAPFROG EFFECTS OF WIRELESS NETWORKS FOR SMES:PRELIMINA...

leapfrog对某矿区各锌矿体的圈定简析

The Ninth International Conference on Electronic Business

作者： Wenshin Chen Department of Management Information Systems Abu Dhabi University Abu DhabiUAE

＜正＞This article briefly summarizes a case study that investigates how wireless networks renovate a community hospital’s competitive *** to limited resources,this small community hospital failed to follow specific implementation patterns that most large or more advanced hospitals ***,older versions of wireless networks have never been implemented in this ***,as technology capabilities of wireless networks continued to emerge in the industry,certain leapfrog effects of these emerging wireless technologies helped this hospital to surpass many of its larger competitors who continued to operate on older versions of wireless networks and relevant *** community hospital’s experiences thus provided insightful lessons for other SMEs that are facing constant technological changes in their respective fields.

关键词： wireless network leapfrog SMEs case study hospital

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世界有色金属 2022年第16期47卷 78-80页

作者：刘富梅紫金矿业集团股份有限公司矿产地质勘查院福建厦门361006

用leapfrog对某矿区圈定矿体实体模型,并对矿体模型进行距离幂次反比法估算资源量。资源量分级据钻孔与矿体相交点的距离进行划分,小于160m的圈成探明资源量,160至320m的圈成控制资源量,320至640m的圈成推断资源量;工程间距无限外推即... 详细信息

用leapfrog对某矿区圈定矿体实体模型,并对矿体模型进行距离幂次反比法估算资源量。资源量分级据钻孔与矿体相交点的距离进行划分,小于160m的圈成探明资源量,160至320m的圈成控制资源量,320至640m的圈成推断资源量;工程间距无限外推即采用见矿工程点向外平推80m圈成推断资源量。本次资源量估算范围除了北矿带东段采矿权外还新增了Ⅱ区的矿体。本次收集的品位表格中总共有2623个样品具有Zn品位值,但对应具有Pb品位值得样品只有1144个样品。由于Pb的数据很少,所以本次只对Zn矿体进行实体圈定并估算资源量,边界品位采用矿山生产的边界品位,即Zn的边界品位为0.6%,Pb品位未参与实体圈定和资源量估算。

关键词： leapfrog 样品矿体三带划分资源量

二维单步交替方向隐式时域有限差分法吸收边界性能分析

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强激光与粒子束 2018年第10期30卷 53-57页

作者：王文兵周辉刘逸飞马良程引会西北核技术研究所强脉冲辐射环境模拟与效应国家重点实验室西安710024

给出了两种适用于二维单步交替方向隐式时域有限差分(2-D leapfrog ADI-FDTD)方法的吸收边界:Mur边界和卷积完全匹配层(CPML)边界。单步交替方向隐式时域有限差分(leapfrog ADI-FDTD)方法是一种无条件稳定的全隐式差分算法,由于二维空间... 详细信息

给出了两种适用于二维单步交替方向隐式时域有限差分(2-D leapfrog ADI-FDTD)方法的吸收边界:Mur边界和卷积完全匹配层(CPML)边界。单步交替方向隐式时域有限差分(leapfrog ADI-FDTD)方法是一种无条件稳定的全隐式差分算法,由于二维空间leapfrog ADI-FDTD的迭代同时存在显式和隐式方程,故而不同电磁分量的边界条件也存在差异。从原理出发,推导了适用于2-D leapfrog ADI-FDTD方法的CPML边界条件,并与一阶Mur边界进行比较,利用自由空间的反射误差来表征两种边界的吸收性能,简要总结了两种吸收边界的优缺点。

关键词： leapfrog ADI-FDTD 无条件稳定 Mur吸收边界 CPML吸收边界吸收性能

共形单步交替方向隐式时域有限差分方法及其改进

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强激光与粒子束 2018年第7期30卷 104-111页

作者：王文兵周辉马良程引会刘逸飞郭景海赵墨西北核技术研究所强脉冲辐射环境模拟与效应国家重点实验室西安710024

提出了一种基于共形网格技术的共形单步交替方向隐式时域有限差分(Cleapfrog ADI-FDTD)方法。与常规FDTD方法相比,此方法能够减小由于目标边界不契合网格划分而引入的阶梯近似误差,提高算法计算不规则目标时的精度;同时算法稳定性更强,... 详细信息

提出了一种基于共形网格技术的共形单步交替方向隐式时域有限差分(Cleapfrog ADI-FDTD)方法。与常规FDTD方法相比,此方法能够减小由于目标边界不契合网格划分而引入的阶梯近似误差,提高算法计算不规则目标时的精度;同时算法稳定性更强,计算效率更高。由于引入共形技术后显著降低了原差分法的无条件稳定性,本文利用增长矩阵本征值方法理论分析了算法的稳定性,然后采用了一种改进的共形面积计算方法,在此基础上提出了一种稳定性更高的改进的共形单步交替方向隐式时域有限差分(ICleapfrog ADI-FDTD)方法。数值算例验证了ICleapfrog ADI-FDTD是一种具有高稳定性和高精度的高效算法。

关键词：共形网格时域有限差分 leapfrog ADI-FDTD 无条件稳定稳定性改进

A 2.5-V 56-mW baseband chain in a multistandard TV tuner for mobile and multimedia applications

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Journal of Semiconductors 2011年第3期32卷 94-99页

作者：杨洲文光俊冯筱 University of Electronic Science and Technology of China

This paper presents post-layout simulated results of an analog baseband chain for mobile and multimedia applications in a 0.13-μm SiGe BiCMOS process.A programmable 7th-order Chebyshev low pass filter with a calibration circuit is used in the analog baseband chain,and the programmable bandwidth is 1.8/2.5/3/3.5/4 MHz with an attenuation of 26/62 dB at offsets of 1.25/4 *** baseband programmable gain amplifier can achieve a linear 40-dB gain range with 0.5-dB *** trade-offs are carefully considered in designing the baseband circuit,and an automatic calibration circuit is used to achieve the bandwidth accuracy of 2%.A DC offset cancellation loop is also introduced to remove the offset from the layout and self-mixing,and the remaining offset voltage is only 1.87 *** in a 0.13-μm SiGe technology with a 0.6-mm2 die size,this baseband achieves IIP3 of 23.16 dBm and dissipates 22.4 mA under a 2.5-V supply.

关键词： multimedia baseband low pass filter leapfrog programmable gain amplifier frequency calibration DC negative feedback loop

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论我国民事诉讼第三审制度之构建