守恒

The speed-sensorless vector control and the identification of motor parameters in this paper are the two novel research of vector control.Using asynchronous machine's mathematic model in three-phase static reference frame, this paper has derived it's mathematic model in two-phase static reference frameand in two-phase rotating reference frame, and got the coordinate transformance formulus based on the constant magnetic force and power force, by compared different field orientation methods, we can find that field orientation at rotor field can realize the decoupling of the stator current flux component

无速度传感器矢量控制和电机参数辨识是矢量控制的两个新的研究方向，本文利用异步电机在三相静止坐标系下的数学模型推导出两相静止坐标系、两相同步旋转坐标系下的数学模型，根据磁动势守恒和功率守恒的原则，得出各坐标变换公式；通过不同磁场定向方式的比较发现，异步电机按转子磁场定向时定子电流励磁分量和转矩分量可以比较方便地实现解耦。

Facing these problems, the half-coupled conservation laws of energy for polar continua, conservation law of energy and Hamilton principle for micropolar multifield theories, principle of virtual velocity and dipolar velocity as well as of virtual stress and dipolar stress for solids with microstructure are proposed.

针对这些问题，提出了半耦合型的极性连续统能量守恒定律、微极多场耦合理论能量守恒定律和Hamilton原理与带有微结构的固体理论的虚速度和虚双极速度以及虚应力和虚双极应力原理等。

Based on consumption of evaporation extended film region responsible for transferring total heat,combination of energy and momentum conservation equation and consideration of effect of disjoining pressure and viscous force,the analytic solution of radial dryout point for thin film evaporation was presented.

假设热量全部通过蒸发扩展液膜区传递，联立能量守恒方程和动量守恒方程，考虑了脱离压力和粘性力的影响，建立了热管微槽蒸发器槽道侧壁面上薄液膜蒸发的径向干点位置的解析解。

They are consistent with those in breathers, demonstrating that the breather is actually a bounded pair of bright and dark solitons. Finally, we find the first conservation law should be modified by adding a phase.

最后，我们发现非零边值DNLSE的无穷多个守恒律中，第一个守恒律当亮孤子与暗孤子数目不相等时需要补上一个位相。

Measurement system for crystal fiber loss has been set up, an idea that single mode quartz fiber acts as the coupler of crystal fiber incident light has been put forward. The propagation loss of the cladded crystal fiber is measured using this measurement system to be 14 times as low as that of the uncladded crystal fiber, and the transmission of low order modes has been realized in the cladded crystal fiber.

利用激光加热基座法生长出了不同直径、不同晶向的LiNbO〓和Nd：MgO：LiNbO〓单晶光纤；根据熔区质量守恒和热量守恒方程解析了生长速度、速度比和激光功率对晶纤内部显微缺陷和直径波动的影响，提出通过控制激光功率和速度比来维持熔区形状的稳定，以实现高品质晶纤的稳定生长。

Both questions have troubled "two realm" philosophers—or dualists to give them their more usual name—, but the former has troubled them more, since modern physics is founded on principles that assert the conservation of various physical quantities. If a non-physical event causes a change in the physical world—dualists are repeatedly asked—, does that not imply that physical quantities like energy or momentum fail to be conserved in any physically closed causal system in which that change occurs?

所有这些问题困扰着二元论的哲学家，但是前一个问题更麻烦些，因为现代物理学坚持多种物理量的守恒原理，二元论者就会反复追问：如果一个非物理事件导致了物理世界的变化，那么，这不是就导出物理量不会守恒（而这是在物理上封闭的因果系统所会发生的）？

A quasi one-dimensional, time dependent system model based on the parallel compressor theory was used to compute the effect of inlet distortion on turbine engine stability; Through Modifying steady state continuum equation, momentum equation and energy equation, the effect of power extraction and additional bleed on turbine engine running line was computed. Unsteady state continuum equation, momentum equation and energy equation were solved for computing the effect of acceleration on turbine engine running line.

其中，进气畸变对发动机气动稳定性影响的计算采用平行压气机模型，基于李亚普诺夫理论的方法完成；附加引气、功率提取对发动机气动稳定性的影响采用通过对发动机转子间质量、动量、能量守恒方程进行修正的方法进行；加速过程对发动机气动稳定性的影响采用欧拉方法求解动态的质量、动量、能量守恒方程的方法完成；最后采用&层迭&的方法进行各种降稳因素的综合评估。

The experimental results agree well with that of the theoretical analysis. The results also show that during the liquid injection, a hollow swirling jet is formed in the shape of an olive with a thin shell.

应用质量守恒定律和动量守恒定律，本文首创性的建立了用于描述旋流喷嘴射流初始阶段所形成的空心旋转射流的运动的理论模型，并采用数值方法进行求解。

For a gauge-invariant system with a higher-order Lagrangian,the quantal Noether identities under the local and non-local transformation in configuration space have also been derived.

指出在某些情形下，由量子Noether恒等式可导致系统的量子守恒律。这种求守恒律的程式与量子Noether定理不同。

In the following, we quantize the supersymmetric anyon system according to the rule of path integral quantization for constrained Hamiltonian system in Faddeev-Senjanovic scheme. We calculate the quantal conserved angular momentum based on the quantal canonical Noether theorem, and present the fractional spin property at the quantum level.

根据约束系统的Faddeev-Senjanovic路径积分量子化方法，我们对超对称任意子系统进行了量子化；根据经典Noether定理，得到了系统的守恒角动量；用量子正则Noether定理讨论了量子守恒角动量，我们发现了系统具有分数自旋性质。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。