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长春光学精密机械与物... [2]
厦门大学 [1]
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会议论文 [2]
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基于性能目标和能量分析的超限高层建筑结构抗震设计及分析
学位论文
2012, 2012
许泽瑶
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浏览/下载:2/0
  |  
提交时间:2016/02/14
超限高层建筑结构
性能目标
能量分析
设计要点
加强措施
High-rise Building
Performance Objective
Energy Analysis
Key Points of Design
Seismic Measures
An 8-channel, area-efficient, low-power audio sampling rate converter (EI CONFERENCE)
会议论文
9th International Conference on Electronic Measurement and Instruments, ICEMI 2009, August 16, 2009 - August 19, 2009, Beijing, China
Kuang H.
;
Wang D.
;
Zhou G.
;
Liu Y.
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浏览/下载:19/0
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提交时间:2013/03/25
A novel 8-channle
third
area-efficient
next a new Timing Division Multiplexer (TMD) scheme lowers clock working rate to minimum in order to save power
a novel memory addressing scheme reduces 20% data memory at least. Experiments show proposed methods could not only saved hardware resources but also reduce power consumption
low-power audio sampling rate converter is proposed in this paper
so it is very suitable for consumer electronics. 2009 IEEE.
conversion ratio is 2:1 and 4:1. Filter design and implementation are the key points for the converter. First
excluded data and coefficients memories
adopting multiplier-free Arithmetic Unit (AU) and rounding methods allows its realization in a cell area of only 0.038mm 2 in 0.18 m technology
Support technique of ultra thin mirror in space optics (EI CONFERENCE)
会议论文
2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, November 2, 2005 - November 5, 2005, Xian, China
Gao M.-H.
;
Ren J.-Y.
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浏览/下载:28/0
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提交时间:2013/03/25
With the development of space optical system
the technique of ultra thin mirror come forth and is paid more attention because of less difficulty in machining
low cost
lightweight
no disassembly during detecting and maintaining. The key technique takes advantage of deformation of ultra thin mirror as the influence of environment to adjust the surface figure. Its accuracy meets requirement. An analysis method is based on finite element analysis (FEA)
and many items
including the amount of support points
the way of arrangement
the optimum design of support component are studied. The finite element method was used to analyze the mirror and some different mirror support schemes. The principal aim of the mirror analysis is to get numbers of support points and the ways of the support. There are three schemes including 12-6-1
12-8-1 and 16-8-1 models. Deformation of deadweight is calculated under the three conditions. The way of 16-8-1 is more suitable than the designs of other two. The support subassembly is amended to meet with the mirror surface RMS in the range of 30m. Deformation of the mirror with support structure has been calculated. The result is 16.52nm
lower than a quarter of the wavelength
which indicates the feasibility of the support scheme applied to mirror. Theoretical result for the best way of support is presented. The result of analysis shows that requirement surface figure could be met through adjusting support points. It predicts feasibility of the support technique and provides theoretical value for active adjustment in the laboratory. At present
support and adjusting experiment of ultra thin mirror is being carried on.
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