轴流

The theory of accretion disks are important for many astrophysical phenomena, including Quasars, active galatic nucleic, X-ray binary stars, and young stellar objects. The most important branch of accretion djsk theory is the stability properties of djsks. It is widely considered that the luminosity variations of various astronomical objects are associated with the instability of accretion disk. The viscosity plays an important role in the accretion disk theory, and magnetic field exists commonly in astronomical phenomena. A more realistic analysis of the stabihty of the accretion disk should include both the radjal and azimuthal perturbations because of the strong shear of viscous flow.In this paper, according to the luminosity Variations of Various astronomical objects, we study the radial-azimuthal instability of an isothermal with magnetic field. We find that the radial and azimuthal fields B〓,B〓 are mainly responsible for enhancing the instability of the magneto-acoustic modes and non-axisymmetric modes,and that pulsational oscillations are larger in the radial than in the Z direction. The model may be useful in explaining the periodic light variation of FU orionis and. T Tauri stars.

在许多天体物理现象中，例如活动星系核，X-射线双星和年青的恒星理论中，吸积盘理论起着重要的作用，而吸积盘理论中的一个重要分支是吸积盘的不稳定性理论，普遍认为活动天体的周期，准周期光变现象与吸积盘的不稳定性有关，在吸积盘理论中，粘滞起着重要的作用，而磁场是天体物理中普遍存在的现象，对于几何薄吸积盘不稳定性分析，由于强剪切流的缘故，应该包括径向和环向扰动两个方面，本文结合天体物理中的各种周期，准周期光变现象，研究了含磁场的等温薄吸积盘的径向-环向振荡不稳定性，结果表明：磁场的径向和环向分量对磁声模和非轴对称模的不稳定性的增加起着主要的作用，且径向振荡大于轴向振荡，所得结果有利于解释FU Orionis和T Tauri Stars的周期光变现象。

The hydraulic characteristics of transverse axis vortex behind the sill of the dissipater are studied with the hydraulic test.

通过水力学试验方法，对跌坎式底流消能工坎后横轴漩涡的水力特性进行了初步研究。

Further, the difference of negative refraction associated with uniaxial crystal and with negative index media is discussed.

同时还发现单轴晶体中的能流负折射现象不能实现Pendry在理论上所预言的完美透镜。

At last, the Z-axis micromachined gyroscope was fabricated in a bulk micromachining process, the difference between design and fabrication has been analyzed.

最后，实际进行Z轴微机械陀螺的流片加工，分析了检测的结果，比较验证了陀螺集成设计方法。

In other types of rotary pumps, the liquid is forced to travel circumferentially, however the screw pump has an axial flow pattern and low internal velocities.

在其他类型的旋转泵，液体被迫旅游圆周，但螺杆泵有轴向流型和低内部速度。

Axial T1 image Figure 4 demonstrates volume loss in the right frontal area with thickened diploic space in this region. Sagittal SE image (Figure 5) shows multiple round signal voids, which are dilated deep medullary veins.

图4轴位T1显示显示右侧额叶体积缩小，相应区域板障增厚，矢状位Se图像（图5）显示多发性圆形流空信号，这是扩张的深部髓质静脉。

METHODS: By unilaterally cauterizing episcleral vessels, the rat model of chronic, moderately EIOP was gotten. 52 rats were divided into 5 groups randomly:model control group, treatment groups with high, middle, low dosage of bushenhuoxue of TCM, and normal control group.

青光眼是一个多因素的不可逆性疾病，目前认为，青光眼的视功能损伤主要由于慢性高眼压（elevated intraocular pressure，EIOP）或低血流灌注压导致缺血、缺氧等，使视神经纤维轴浆流中断，从而引起青光眼视神经损害[1]。

Results: Thrombus within right ventricle and main pulmonary artery was detected in 6 patients, right atrium and RV enlargement was found in 19 patients, right ventricular hypokinesis was found in 21 patients, hypokinesis of interventricular septum was detected in 13 patients, MPA and right pulmonary arterial dilation was found in 22 patients, marked tricuspid regurgitation was detected in 23 patients, pulmonary hypertension was found in 23 patients.

右心异常改变者26例（包括超声直接检出血栓的6例），其中右房室增大19例；右室收缩功能减退21例；室间隔左移、左室短轴切面室间隔向左室膨突呈&D&型改变1例；室间隔运动幅度减低13例；主肺动脉及右肺动脉增宽22例；三尖瓣中量以上返流23例；肺动脉收缩压增高23例，范围在33~81mmHg (62.87±23.46 mmHg)，治疗后肺动脉压明显下降，范围在21~52 mmHg (34.26±13.52 mmHg)。

The meiobar area tends to increase. The static pressure in pressure side is distributed most uniformly with 36 blade number.

轴面流道涡旋范围先增加后逐渐减小；而叶片吸力面的低压区逐渐扩大；叶片数为36时压力面的静压分布最均匀。

The meridionally accelerated axial-flow fans including meridian acceleration rotor, vaneless diffuser and volute was numerically simulated in the whole flow passage by Reynolds time-averaged N-S equations with tensor and k-ε turbulence model.

采用三维雷诺时均N-S方程和标准k-ε湍流模型，对包含叶轮、无叶扩压器与轴向蜗壳于一体的子午加速风机进行了整机全流道的数值模拟。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。