VKM—5型立式捏合机研制与应用

介绍自行研制的VKM—5型立式捏合机的构造及工作原理,详述了该机采用液压传动和气动元件进行位置检测以及气、电、液安全联锁的特点,并说明与卧式捏合机对比试验情况。     

计算机帧时间对半实物仿真的影响

半实物仿真试验中,要求计算机帧时间与计算积分步长相一致,但在实际试验中不容易精确地做到。本文分析了这种不一致给半实物仿真试验带来的影响,给出了解决的办法,文章中还给出了一实例来说明。     

Field formation around negatively biased solar arrays in the LEO-plasma

Heavy emission caused by impacting plasma ions results in a fast discharging effect of the initially large surface potentials on the dielectric solar cells. This eventually counteracts the energization process of the plasma ions to the cover glasses and leaves no significant electric fields. Thus, with an existing thermal plasma, electrons are again able to reach dielectric surfaces. Strong localized electric fields of the order of several 10 kV/cm form near the interconnector-cover glass interface.     

高精度算术运算

本文针对当前各种计算机高级语言运算精度的不足，用PASCAL语言实现了高精度的加、减、乘、除算术四则运算。以满足教学、科研的实际需要。     

EUV emission from normal galaxies

Using data from the Wide Field Camera EUV all-sky survey, we have established upper limits to the EUV flux from a sample of 30 bright, nearby, non-active spiral galaxies. These galaxies were chosen to be those most likely to be detected in the EUV on the basis of (i) low interstellar absorption within our own galaxy, (ii) brightness in other wavebands, (iii) high star formation activity, and (iv) proximity. The derived EUV upper limits are restrictive, and establish for the first time that the EUV flux escaping from galaxies does not constitute a major component of their bolometric luminosity, and in particular that it cannot be the sink for the energy injected into the interstellar medium by supernova explosions, as had been suggested following the failure to detect this power in the X-ray band.     

新建他激反激变换器方程及其解析解

引用文 [1 ]的思路 ,寻找他激反激变换器的运行状态特征参量 (磁通密度增量、剩余磁通密度和占空比 )与构成这一变换器的基本物理参量之间的函数关系。首先阐明由于频率给定 ,他激反激变换器稳态运行时会出现无剩磁工况和有剩磁工况两种。而后确定这两种工况下 ,磁路等效储能空间单位体积每个周期的传输能量 (命名为“磁能传输密度”)。在这基础上 ,分别建立和解出他激反激变换器在不同工况下稳定运行时应满足的方程。最后根据所得的解析解阐明这种变换器的特性。本文和文 [1 ],以磁路分析为基础建立了一种新的反激变换器理论。     

普通高校一年级体育课程教学模式的构建

在总结以往多年教学经验的基础上，对目前体育课程发展状况进行了研究和理性思考，淮阴工学院在一年级进行体育课程改革与实践，提出“主项课”的教学模式，取得一定的成效。同时，对存在的一些主要问题提出进一步的设想和改进措施。     

A bistatic SAR mission for earth observation based on a small satellite

The authors present a new scientific space mission consisting of a satellite carrying a receiving- only SAR which receives the signal transmitted by the ENVISAT-1 SAR. The integration of ENVISAT-1 SAR and bistatic radar data offers an improved potentiality of surface classification, three-dimensional observation, and the opportunity of advanced scientific experiments in the field of bistatic scattering. The small satellite nominal orbit and the attitude manoeuvres are designed in order to maintain an adequate overlap between the two radar swaths along the whole orbit, taking into account the ENVISAT-1 attitude and pointing. A preliminary satellite design (2-year lifetime) is then performed to evaluate the orbit decay and to determine the appropriate orbit manoeuvres (every 4 days) to control the satellites relative phase. The numerical simulation shows that a spacecraft of about 584kg is able to meet the mission requirements.     

平直地面对一类圆极化波的等效反射系数

本文研究了入射波电场为任意线极化时,平直地面反射波中左旋圆极化分量和右旋圆极化分量的数学描述,引入了地面对这类波的等效反射系数的概念,并给予了物理解释,讨论了应用的有关问题。     

塑性动态断裂过程中梁的塑性铰转动因子的确定方法

运用理论分析方法和实测试验方法，探讨了梁在塑性动态断裂过程中，其塑性铰转动因子的变化规律，提出了断裂过程中塑性铰几何转动因子的概念及其确定方法，并以３点弯曲梁理论分析解为例，计算了梁在塑性动态断裂过程中，其塑性铰转动因子的变化规律。该计算结果与３点弯曲梁动态断理解实验实测相一致。理论分析进一步明确了梁的塑性铰转动因子具有几何与物理两种不同的本质含意，并可直接用于修正梁的塑性动态断裂的理论分析解。