查询词典 direction constant

According to the uncertainty principle, the mathematical product of the combined uncertainties of simultaneous measurements of position and momentum in a given direction cannot be less than Planck's constant h divided by 4π.

根据不确定性原理，同时测量位置和给定方向的动量时，合成不确定度之积，不能小于普朗克常数除以4π。

1 Pan Pearl River Delta Physics Olympiad 2009 2009 年泛珠三角及中华名校物理竞赛 Q2 Spin Torque (16 points)题 2 自旋力矩(16 分) An electron has permanent angular momentum called spin that is fixed in amplitude h / 4π, where h is the Planck Constant, while its direction can be changed by external interactions.

电子具有固有的角动量 S ，叫做自旋，其方向可在与外界的相互作用下改变，其大小为固定的 h / 4π，其中 h 为普朗克常数。一导线载有电流 I，导线的下半部分由磁化了的导体组成，上半部分由非磁性导体组成。

Motion synchronization between tool in X direction and principal axis rotation was controlled by electronic gearbox in cam turning. And profiling mechanism could be superseded by servo tool-holder. Linear motor direct drive servo tool-holder was designed, and host-slave control system with PC and DSP was developed for the require of high-speed and realtime servo. The technical process was analyzed in cam turning. Servo tool holder with tool swinging and principal axis variable rotate speed were presented to keep constant cutting angle and speed.

将电子齿轮箱用于凸轮车削加工系统的传动，以伺服刀架取代了传统加工的靠模装置，实现了刀具X方向直线运动与机床主轴转动的同步控制；设计了直线电机直接驱动的伺服刀架及基于PC与DSP构成的上—下位机控制结构，采用DSP进行实时控制以满足高速伺服需要；对凸轮加工过程的工艺特点与恒角度、恒速度车削进行研究，提出了具有刀具摆动功能的伺服刀架与机床主轴变转速运动方案。

The constant phase velocities in the direction of the corresponding plane-wave vectors for isotropic media result in three spherical slowness surfaces for each fiber orientation.

这些慢度曲面与各向同性材料中相应平面波矢的相速度为常数的情况不同，对任一纤维方向，都有三个球形的慢度表面。

On the assumption that the unevenness of runway profiles along the direction of taxi - ing is a stationary random function,techniques of piecewise constant-speed taxi ing runs and piecewise linear representation of dynamic properties of airplane landing gears are adopted in this paper to approximately simplify the actual nonlinear and nonstationary random vibration prob-lems to the piecewise linear and stationary ones.

在飞机滑行方向跑道路面不平度为平稳随机函数的假设下，采用滑行过程分段等速化、起落架动态特性分段线性化方法，把原非线性非平稳随机振动问题，简化为分段线性平稳随机振动问题。

Reason may be a small force, but it is constant, and works always in one direction, while the forces of unreason destroy one another in futile strife.

理性或许只是一股小小的力量，但它是持久的，而且只指向一个固定的方向；相反那些非理性力量则会在徒劳的纷争中相互摧毁，消逝殆尽。

The most of time in this period of time, the relationship between the people in this basin and the nature is opposite, thereby in a certain way it causes the further fragileness in its natural eco-environment and makes the direction of deterioration to be in constant transformation, and it has already seriously intimidated the normal producing live of the people in the basin.

该时段的大部分时间，盆地内人与自然的关系基本上是对立的，从而在很大程度上导致了其自然生态环境更加脆弱并向恶化的方向持续变迁，已经严重威胁到该区域人类正常的生产生活。

The diagnoses of levoversion and isolated levocardia could be confirmed only by hilum-tomography or high KV chest plain film and thoracic-abdominal plain X-ray, which can give the morphology of bronchi, the position of the liver and the direction of the apex, because there is a constant relation between bronchi, venous atria and great lobe of liver.

总结了9例左旋心和3例孤立左位心的临床资料，对其诊断和治疗进行了分析。

While maintaining constant altitude and speed, execute a 360 degree turn in the opposit direction, the helicopter should flying directly at the pilot again.

保持固定的高度及速度，向另一侧执行360°水平圆，此时机尾又朝向操控者后退飞行。

At constant viscosity, by increasing the liquid flow rate, the liquid film's velocity is increased; at the same experiment condition, the frequency of the liquid film is same at the same radial direction; the air current has minimum effect on liquid film bottom flow velocity, while it has an obvious effect on liquid film surface flow velocity. The longer the distance between liquid film and the inlet, the lower the pulsatory frequency and longer the wavelength.

在粘度基本不变的情况下，随着液体质量流率的增加，液膜流动速度随之增加；在同一个实验条件下，沿圆管径向各质点的频率基本保持不变；气流场速度对液膜底层流动速度影响很小，对于液膜表面流动速度有着较大的影响；沿液膜流动方向，液膜的脉动速度逐渐增加，脉动频率降低，脉动波长变长，与报道的通过快速摄像得到的液膜发展趋势一致，证实用PDA研究液膜流动是可行的。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。