中国科学院机构知识库网格系统: 检索

A new algorithm for solving the best-fit sphere of optical aspherical surface (EI CONFERENCE) 会议论文 OAI收割
2nd International Conference on Advances in Materials and Manufacturing, ICAMMP 2011, December 16, 2011 - December 18, 2011, Guilin, China
作者: Lin J.; Lu M.

收藏 | 浏览/下载：38/0 | 提交时间：2013/03/25

To solve the best-fit sphere (BFS) accurately is one of the technological keys for the generating and testing of optical aspherical surfaces. This paper presents a new algorithm for solving the BFS of aspherical surfaces to suppress some deficiencies in the existing BFS algorithms. In the proposed approach it is not only suitable for the conic surface a BFS is constructed but also for higher order aspheres. The obtained asphericity and material removal function is more suitable for the machining and test. (2012) Trans Tech Publications which passes through both sides of endpoints in the section o -?xy of the aspherical surfaces Switzerland. the center of the BFS is shifted along the x-axis and its radius of curvature is automatically computed. The variable step size method is proposed to speed up the convergence of the iteration. Through numerically solving the BFS of conic and cubic surface the advantages of the proposed approach are verified. The results show that the proposed approach is of rapid convergence and high accuracy

The load analysis of chisel-edge ruling tool for diffraction gratings (EI CONFERENCE) 会议论文 OAI收割
2012 International Applied Mechanics, Mechatronics Automation Symposium, IAMMAS 2012, September 7, 2012 - September 9, 2012, Shenyang, Liaoning, China
作者: zhang f.; zhang f.

收藏 | 浏览/下载：16/0 | 提交时间：2013/03/25

The process of wear design on chisel-edge ruling tool of diffraction gratings is very complex because of following two reasons that one is the load distribution on minute edge area when grating ruling and the other is the anisotropic character of natural diamond. The former is the first step when wear design on chisel-edge ruling tool of diffraction grating In order to predicate the load distribution on minute edge area of tool this paper simulated the load distribution on minute edge area of tool by software when ruling on Aluminum-1100 with tabular data format flow stress and Aluminum-1100 with Power law flow stress respectively and through comparative analysis determined the approximate load distribution on minute edge area of chisel-edge ruling tool that the high load mainly focused on the edge area close to the tip of ruling tool and amount to 200MPa while about to 100MPa on the face of tool. (2012) Trans Tech Publications Switzerland.

Simulation of a collimated Gaussian-beam propagating through an atmospheric turbulence (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electronics and Optoelectronics, ICEOE 2011, July 29, 2011 - July 31, 2011, Dalian, China
作者: Zhang L.; Zhang L.

收藏 | 浏览/下载：19/0 | 提交时间：2013/03/25

A Split-step method based on scalar Fresnel diffraction theory is used to emulate a collimated Gaussian-beam propagating through the Kolmogorov turbulent atmosphere in this paper. We acquire the distribution of irradiance and phase on the receiver aperture through choosing accurate simulation parameters. At last the accuracy of simulation is verified through comparing the coherence factor of simulated beam field with that of theoretical field. 2011 IEEE.

Estimation algorithm of mobile OFDM CFOs based on step-size (EI CONFERENCE) 会议论文 OAI收割
2009 International Conference on Information Engineering and Computer Science, ICIECS 2009, December 19, 2009 - December 20, 2009, Wuhan, China
Lin L.; Qiao Y.-F.; Su W.-X.

收藏 | 浏览/下载：25/0 | 提交时间：2013/03/25

In order to maintain orthogonality among subcarriers for mobile OFDM a CFOs step-size estimation model is established to avoid severe performance degradation caused by ICI and algorithmic stability step-size parameter the error of CFOs estimate and etc are investigated. First after an averaging window algorithm is introduced the mathematic model of step-size estimation algorithm is obtained through step-size parameter and time-varying CFOs. Then based on the results of MATLAB simulation the determination of step-size parameter the advantages of step-size algorithm and precision are discussed. Finally time sequence plots of added CP interleaver and subcarrier modulation with VHDL are presented. Experimental results indicate that the maximum of CFOs errors is 0.00987 in 3 variance interval when mobile velocity is 400 km/h according with verdicted principle that in order for the ICI effects to be negligible the error of CFOs estimation must be accurate within 1-2% of the subcarrier spacing and programs can correctly implement on circuit board. 2009 IEEE.

Differently lasting effects of prenatal and postnatal chronic clozapine/haloperidol on activity and memory in mouse offspring 期刊论文 OAI收割
PHARMACOLOGY BIOCHEMISTRY AND BEHAVIOR, 2006, 卷号: 84, 期号: 3, 页码: 468-478
作者: Wang JH; Yang JZ; Wilson FAW; Ma YY[*]

收藏 | 浏览/下载：18/0 | 提交时间：2010/08/24

Haloperidol Clozapine Offspring Open-field Step-through Water-maze

Ketamine affects memory consolidation: Differential effects in T-maze and passive avoidance paradigms in mice 期刊论文 OAI收割
NEUROSCIENCE, 2006, 卷号: 140, 期号: 3, 页码: 993-1002
作者: Wang JH; Fu Y; Wilson FAW[*]; Ma YY[*]

收藏 | 浏览/下载：13/0 | 提交时间：2010/08/24

memory consolidation retrieval step-through T-maze ketamine

Study on LD-pumped Nd:YAG laser cutter (EI CONFERENCE) 会议论文 OAI收割
ICO20: Lasers and Laser Technologies, August 21, 2005 - August 26, 2005, Changchun, China
作者: Zhang G.; Zhang G.; Zhang G.; Zhang J.; Zhang J.

收藏 | 浏览/下载：22/0 | 提交时间：2013/03/25

The theory of laser cutter and the technology neck is analyzed. We can conclude that it is almost impossible to deal with the waste thick silicon wafers which are yielded in producing silicon wafers by conventional eroding or diamond cutting when the cutting velocity equals 100mm/min while it is also unperfected with ecumenical laser cutter without good beam quality or precise laseroptics system. It is represented that high average power and high repetition rate laser with good beam quality and precise laseroptics system are pivotal to obtain excellent cutting effect such as thick groove depth double-layer 0.75mm thick silicon wafer can be penetrated.. The cross section is fine and the groove is narrow rapid cutting speed the cutting quality meets the expecting demand. fine kerf section without considering the effect of technique. Considering laser medium thermal lens effect and thermal focal length changing with pumping power using plano-convex high reflectivity mirror as the back cavity mirror to compensate the heat lens influence a /4 waveplate to compensate heat -induced birefraction utilize the Nd:YAG self- aperture effect more than 50 W average power 1.064 um IR output is obtained with beam quality factor (M2) equals 3.19. Through the LD-Pumped Nd:YAG laser cutter we developed with short focus length negative spherical aberration focusing lens double axis linear step motor positioning system suitable beam expander multiplying factor appropriate diameter of exit beam aperture proper repetition rate when the cutting velocity equals 400mm/min 0.75mm thick silicon wafer can be penetrated

Study on optical parts of MOEMS optical switch with low insertion loss (EI CONFERENCE) 会议论文 OAI收割
MEMS/MOEMS Technologies and Applications II, November 10, 2004 - November 12, 2004, Beijing, China
作者: Wang W.; Wang L.; Wang L.; Wang L.; Chen W.

收藏 | 浏览/下载：31/0 | 提交时间：2013/03/25

We study insertion losses of optical switch when the laser beam is propagating during the free space between two single mode fibers (SMFs) and the related assemblage challenges Then a new packaging structure is developed for the hybrid-integration of free-space MOEMS (micro-opto-electro-mechanical systems) chip with a silicon micromachined submount to improve alignment accuracy. The submount is designed to accommodate various free-space MOEMS chips with minimal active optical alignment thus reducing the packaging cost. The silicon submount has a central recess to place the MOEMS chip in sixteen V-grooves for optical fibers and micropits for micro ball lenses all bulk micromachined at the same time by a single anisotropic wet etching step. A corner compensation technique is employed to prevent erosion of the convex corners where different geometries meet. Through this assembling method the fiber micro ball lens can be aligned preciously thus reduced lateral and angular misalignment between them. Then total insertion losses can be decreased.

Effects of stress on memory process in a passive avoidance paradigm 期刊论文 OAI收割
NEUROLOGY PSYCHIATRY AND BRAIN RESEARCH, 2004, 卷号: 11, 期号: 2, 页码: 103-108
作者: Wang, JH; Cai, JX; Ma, YY

收藏 | 浏览/下载：24/0 | 提交时间：2015/09/17

stress acquisition consolidation retrieval step-through

Effect of paradoxical sleep deprivation and stress on passive avoidance behavior 期刊论文 OAI收割
PHYSIOLOGY & BEHAVIOR, 2003, 卷号: 79, 期号: 4-5, 页码: 591-596
作者: Wang, JH; van den Buuse, M; Tian, SW; Ma, YY; J. Hong Wang

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收藏 | 浏览/下载：19/0 | 提交时间：2011/08/22

paradoxical sleep step-through passive avoidance aversive memory