用甲基丙烯酸甲脂聚合物砼修补接缝

用甲基丙烯酸甲脂聚合物砼（ＭＭＡ－ＰＣ）修补接缝尚存在许多问题，因此要系统分析ＭＭＡ－ＰＣ的化学性能。介绍了用ＭＭＡ－ＰＣ修补接缝的改进方法，而且反修率极低。     

降阶脉冲发动机的点火控制逻辑

本文研究脉冲发动机在战术导弹,特别是空空导弹上的应用.因为其飞行任务要求对能量消耗作仔细地监控.一般的中程空空导弹使用助推-主发动机作为动力.除了接近交会之外,发射时导弹雷达导引头并不知道目标.一般的中程空空导弹使用比例导航或者在终段制导使用改进的比例导航,同时为了使导弹在较高的高度飞行以减小阻力,在中段附加了预编程的     

时钟在GPS接收机中的作用

每个刚接触GPS的人首先了解到的是:时钟是该技术的核心。GPS卫星载有非常精确、超稳定、每个耗费数万美元的原子钟。然而,出于显而易见的原因,大多数GPS接收机中的时钟很便宜。除了跟踪卫星信号时,由于要求时钟信号中的相位噪声,对接收机时钟要求较高,其它应用对接收机时钟的要求都不是很高。这一要求通常用100美元左右或更少的温补晶振就可满足。     

A METHOD FOR CALCULATING KINEMATIC PARAMETERS OF HELICOPTER IN LOOP AND ROLL MANEUVERS

ＡＭＥＴＨＯＤＦＯＲＣＡＬＣＵＬＡＴＩＮＧＫＩＮＥＭＡＴＩＣＰＡＲＡＭＥＴＥＲＳ　ＯＦＨＥＬＩＣＯＰＴＥＲＩＮＬＯＯＰＡＮＤＲＯＬＬＭＡＮＥＵＶＥＲＳＣａｏＹｉｈｕａ；ＧａｏＺｈｅｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＡｉｒｃｒａｆｔＥｎｇｉｎｅｅｒｉｎｇ．...     

TWO NEW RECOGNITION METHODS FOR SPATIAL PLANAR POLYGONS

ＴＷＯＮＥＷＲＥＣＯＧＮＩＴＩＯＮＭＥＴＨＯＤＳＦＯＲＳＰＡＴＩＡＬＰＬＡＮＡＲＰＯＬＹＧＯＮＳＣｈｅｎｇＹｕ（ＤｅｐａｒｔｍｅｎｔｏｆＥｎｇｉｎｅｅｒｉｎｇ，ＮＵＡＡ２９ＹｕｄａｏＳｔｒｅｅｔ，Ｎａｎｊｉｎｇ２１００１６．Ｐ．Ｒ．Ｃｈｉｎａ）Ａｂｓ...     

FUSELAGE STRUCTURAL OPTIMIZATION WITH MSC／MOD PRE－PROCESSING AND MSC／PAL2 POST－PROCESSING

ＦＵＳＥＬＡＧＥＳＴＲＵＣＴＵＲＡＬＯＰＴＩＭＩＺＡＴＩＯＮＷＩＴＨＭＳＣ／ＭＯＤＰＲＥ－ＰＲＯＣＥＳＳＩＮＧＡＮＤＭＳＣ／ＰＡＬ２ＰＯＳＴ－ＰＲＯＣＥＳＳＩＮＧ￥ＣｈｅｎＭｕｌａｎ（ＲｅｓｅａｒｈＩｎｓｔｉｔｕｔｅｏｆＰｉｌｏｔｌｅｓｓＡｉｒｃｒａ...     

GENERATION AND APPLICATION OF UNSTRUCTURED ADAPTIVE MESHES WITH MOVING BOUNDARIES

INTRODUCTIONMany engineering applications require thenumerical prediction of strongly unsteady flowsinteracting with moving bodies.A case in pointis that the detailed calculation of sphere motionsin an unsteady field induced by blast waves is akey issue to determine the drag force exerting up-on the sphere by the surrounding gas and,inturn,to reveal the mechanism of unsteady effectson the drag coefficient.To cope with such pro-blems,one should simulate unsteady flows withmoving boundary co…     

A FINITE ELEMENT ADAPTIVE METHOD FOR SOLVING GENERALIZED STOKES PROSLEM

ＡＦＩＮＩＴＥＥＬＥＭＥＮＴＡＤＡＰＴＩＶＥＭＥＴＨＯＤＦＯＲＳＯＬＶＩＮＧＧＥＮＥＲＡＬＩＺＥＤＳＴＯＫＥＳＰＲＯＳＬＥＭＤ．Ａ．ＦｏｋｉｎＹａｎｇＺｕｏｓｈｅｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＡｅｒｏｄｙｎａｍｉｃｓ，ＮＵＡＡ２９ＹｕｄａｏＳｔｒｅｅ...     

Adaptational changes in the neural control of cardiorespiratory function in a confined environment: the CNEC#3 experiment

The goal of the study was to characterize the changes in neurovegetative control of the circulation, attending the presumed physiological and psychological stress originated by the isolation and confinement typical of the living condition of space stations, as simulated in a ground based unit, using time and frequency domain analysis. As a secondary goal we sought to verify the implementation of real time data acquisition, for off line spectral analisys of R-R interval, systolic arterial pressure (by Finapres) and respiration (by PVF2 piezoelectric sensors).

We addressed the cardiorespiratory and neurovegetative responses to standardized, simple Stressors (active standing, dynamic and static handgrip) on the EXEMSI 92 crew, before, during and after the isolation period.

On average the appropriate excitatory responses (to stand, dynamic and static handgrip) were elicited also in isolation and confinement.

Active standing and small masses muscular exercises are easy to be performed in a confined and isolated environment and provide a valuable tool for investigating the adaptational changes in neural control mechanisms.

The possibility there exists of using this time and frequency domain approach to monitor the level of performance and well being of the space crew in (quasi) real time.