NOVEL HIGH-SPEED FPGA-BASED FFT PROCESSOR

A novel architecture for computing the fast Fourier transform ( FFT ) on programmable devices is presented.To improve the system operation speed , a hybrid parallel FFT algorithm is used.Results indicate that the use of an 8×8parallel structure for realizing the 64-point FFT leads to a 8times higher processing speed compared with its counterparts employing other series of techniques.     

对直升机齿轮齿根应力分布规律的研究

本文不但指出并纠正传统齿轮齿根应力分析中的错误及不妥，而且还提出一组可确定直升机齿根剖面上正应力、剪应力以及主应力等分布规律的解析表达式。     

A LM-2D Launches GF-6 Satellite

正A LM-2D launch vehicle lifted off from the Jiuquan Satellite Launch Center at 12:13 Beijing time on June 2,launching the GF-6 satellite as well as the Luojia-1 scientific experiment satellite into their preset orbits.The GF-6 satellite was developed by the China Spacesat Co,Ltd.,under the     

对长期飞行任务中航天员医学防护问题的思考

通过对国外航天医学发展的分析,结合我国载人航天发展实际,综述长期飞行任务中失重、辐射等因素对人体的影响,从医学监测和失重生理效应防护技术角度对行星际航天飞行任务中保障航天员的健康安全提出建议,为我国航天事业未来发展提供参考.     

37mm冲压加速器热发射试验初步结果

气动中心超高速所自行研制成国内第一座冲压加速器，并成功地实现了弹丸的冲压加速。文中首先给出冲压加速器的工作原理、国内外研究现状，以及３７ｍ ｍ 口径冲压加速器系统组成，最后给出了热发射不起动（ｕｎｓｔａｒｔ）和热发射实现冲压加速的初步结果     

Feasibility of developing an ionospheric E-region electron density storm model using TIMED/SABER measurements

We present a new technique for improving ionospheric models of nighttime E-region electron densities under geomagnetic storm conditions using TIMED/SABER measurements of broadband 4.3 μm limb radiance. The response of E-region electron densities to geomagnetic activity is characterized by SABER-derived NO⁺(v) 4.3 μm Volume Emission Rates (VER). A storm-time E-region electron density correction factor is defined as the ratio of storm-enhanced NO⁺(v) VER to a quiet-time climatological average NO⁺(v) VER, which will be fit to a geomagnetic activity index in a future work. The purpose of this paper is to demonstrate the feasibility of our technique in two ways. One, we compare storm-to-quiet ratios of SABER-derived NO⁺(v) VER with storm-to-quiet ratios of electron densities measured by Incoherent Scatter Radar. Two, we demonstrate that NO⁺(v) VER can be parameterized by widely available geomagnetic activity indices. The storm-time correction derived from NO⁺(v) VER is applicable at high-latitudes.     

新一代复合材料及结构细节分析技术及其在航空行业的应用

作为P-method的真正工程化应用的StressCheck是新一代复合材料及细节结构强度分析软件,可快速得到高度可靠的分析结果,并可以参数化、标准化、自动化的方式进行分析工作。在复材的结构及功能设计、复合材料选材、铺层设计及验证等方面都能发挥很好的作用。     

Relationship Between Corrosion Level of Steel Bar and Diameter of Corroded Sensing Steel Wire in Wireless Sensor

A kind of wireless sensor was previously developed,which is powered and transmit signals wirelessly instead of using an electrical connection to the embedded reinforcement.Based on this technique,the relationship between diameters of corroded sensing steel wires and corrosion levels of steel bars is established by experiments.Quadratic function is utilized to fit the experiment results,and the correlation coefficients are all larger than 0.95.Estimated corrosion levels of commonly used steel bars are given for different diameters of corroded sensing steel wires fractured due to corrosion.     

复合材料机翼油箱盖板的制造和质量控制

介绍了采用开模膨胀橡胶法制造带加强筋的复合材料机翼整体油箱油箱盖板的一次共固化的工艺方法.针对初期制造的油箱盖板存在的比较严重的质量问题,包括翘曲、筋条尺寸超差、大面积分层及空隙密集等,提出了相应的设计修改、工艺改进和质量控制措施,最终制造出合格的制件.通过了功能试验和飞行考核.