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本文以杆状人造卫星的摆动为例,说明了质心和重心的区别.文中分析了杆状人造卫星摆动的原因,导出了卫星摆动周期的计算公式. 相似文献
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用分析力学方法导出绕地心作圆周运动的杆状同步卫星绕质心运动的微分方程并讨论了它的摆动周期,得出不可能有在地球子午面内的卫星摆动,因而不可能有在地球子午面内的卫星摆动周期的结论. 相似文献
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质点在竖直面内旋轮线上作摆动时,已经证明周期是与摆幅无关,而匀称刚体在一个旋轮面上作纯滚摆动时,其周期是否也与摆幅无关呢?本文论述其摆动周期与摆幅有关,仅在刚体质心所走过的轨迹为旋轮线时周期与振幅才无关. 相似文献
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推导出了任意振幅下的摆动周期相对误差的解析表达式,利用从头算起的数值方法,计算了振幅介于0°到90°之间的任意振幅摆动周期的相对误差. 相似文献
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铝-铜-镓三元系合金相图的室温截面已经用X射线方法测定出来了。室温固相截面包含11个单相(即α, γ2, γ′, δ, ζ1, ζ2, η2, θ, θ′,α铝和镓)相区,14个双相(即α + ζ1, α+ γ2, α + γ′, γ2 + γ′, γ′+ ζ1, γ2+δ, γ′+δ,δ +ζ2, ζ2+η2, η2+θ,η2+ θ′, γ′ + θ′, θ′+ 镓和θ+α铝)相区和9个三相(即α + γ′+ζ1, α+ γ2+ γ′, γ2+ γ′ + δ,γ′ + δ + θ′, δ+ζ2+θ′, ζ2 + η2 + θ′, η2+ θ′ + 镓, η2 +θ + 镓和θ +镓+ α铝)相区。所有单相和三个二元系内室温存在的单相相同,没有新相出现。
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本文对工程专科物理教学中在讨论有限多次测量结果的优劣与测量炊数之间的关系时常常出现的一个疑义作了解释。 相似文献
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关于动量矩定理的矩心选取问题已经讨论了几十年[1,2,8,4]。本文给出动量矩定理的统一形式。特别是导出了相对于速度瞬心的动量矩定理。在一般情况下它被认为是不可行的,然而我们用此定理解决了一个例题。该例通常被认为是相对于速度瞬心的动量矩定理不成立的有力证据。 相似文献
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Shidu Dong Xiaofan Yang Bo He Guojin Liu 《International Journal of Infrared and Millimeter Waves》2006,27(11):1517-1528
Radiance coming from the interior of an uncooled infrared camera has a significant effect on the measured value of the temperature
of the object. This paper presents a three-phase compensation scheme for coping with this effect. The first phase acquires
the calibration data and forms the calibration function by least square fitting. Likewise, the second phase obtains the compensation
data and builds the compensation function by fitting. With the aid of these functions, the third phase determines the temperature
of the object in concern from any given ambient temperature.
It is known that acquiring the compensation data of a camera is very time-consuming. For the purpose of getting the compensation
data at a reasonable time cost, we propose a transplantable scheme. The idea of this scheme is to calculate the ratio between
the central pixel’s responsivity of the child camera to the radiance from the interior and that of the mother camera, followed
by determining the compensation data of the child camera using this ratio and the compensation data of the mother camera
Experimental results show that either of the child camera and the mother camera can measure the temperature of the object
with an error of no more than 2°C. 相似文献