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Then the FLUENT software was used to simulate the amphibious vehicle' ambient flow field through defining the unsteady boundary condition. The lift, resistance, velocity, pressure, and wave of the amphibious vehicle moving in the regular waves were obtained, which can avoid the errors resulted from neglecting the free surface and provides theoretic basis for the research on optimization design of high performance amphibious vehicle.

在计算出某改进型两栖车在微幅规则波中高速迎浪运动时升沉和纵摇特性的基础上,运用FLUENT软件,通过自定义非定常入口边界实现了两栖车在微幅规则波中运动的三维流场数值模拟,得到了升力、阻力、速度、压强和兴波等流场参数,实现了两栖车在波浪中的绕流场数值模拟,解决了以往由于忽略兴波特性导致数值计算结果随航速提高误差不断增大的问题,为高性能两栖车的外形设计研究提供了理论依据。

We calculate the linear responses of the spin density and spin current density to the SU(2) external fields.

我们计算了具有Rashba或Dresselhaus自旋轨道耦合的系统中自旋密度及自旋流密度对SU(2)外场的线性响应。

It introduces the method of measuring theparameter of the multiphase flow, the familiar the equipment measuring the multiphase flow,analyzed contrastively the plan based corrrlation measurement and nondisjunction and basedgas- liquid adaptive cylindrical cyclone, the paper chooses the last one for the research plan.

介绍了多相流参数测量的方法;介绍了常见的多相流测量装置;对比分析了基于相关测量的不分离的测量方案和基于小型管柱式气液旋流自适应分离的分离测量方案,选择了后一种方案作为本文的研究方案。

In addition to measurements of conventional dynamic parameters o n a model surface,an optical observation method was employed,which directly reco rded self-luminosity of high temperature gas induced by a two-dimensional mode l in high enthalpy flow and combustion radiation.Hypersonic flow fields passing over a sharp strut including fuel injection were displayed and recorded with a high-speed CCD camera.A phenomenon of supersonic diffusive combustion under fre e boundary condition was observed.

实验除测量常规流场参数和模型表面的动态参数外,主要使用二维实验模型,利用高温气体的自发光和燃烧伴随的发光现象,采用高速摄影技术来观测燃烧现象,记录到高焓流场中叠加燃料喷射和燃烧的流场,观察到自由边界条件下扩散控制的超声速燃烧现象。

The results show that the tide of Shenzhen Bay is mainly irregular semidiurnal and the horizontal tidal current is reversing current, mainly in southwest-northeast direction.

计算结果表明:深圳湾海域属不正规半日潮,水平潮流具有明显的往复流性质,主要呈西南-东北走向;落潮流速略大于涨潮流速;受地形及陆地河流径流的影响,湾中到湾口及航道附近流速较大,湾顶和靠近香港的滩涂部分流速较小;深圳湾余流场较弱,余流流向指向湾外:整个深圳湾水交换较弱,海域自净能力较差。

No Ⅲ° atrioventricular conduction block happened, 9 patients developed right bundle branch block, and 2 patients showed junctional rhythm. Two patients with perimembranous extending outlet were repaired because of residual shunt(0.4cm,0.3cm) on the anterosuperior rim of defect. One patient with trivial residual shunt(0.15cm) on the posteroinferior rim of defect was found closed spontaneously six months later. Tricuspid valve was incised in 10 patients of VSD sextending outlet,8 patients vertical to the valve ring,2 patients parallel to the valve ring. Moderate tricuspid valve regurgitation was found in 1 patient, mild in 5 patients, trivial in 4 patients. No one aggravated. One patient complicated with pericardial effusion.

无Ⅲ°房室传导阻滞发生,9例发生右束支传导阻滞,2例结性心律。2例膜周偏流出道型VSD患者因前上缘残余分流分别为0.4cm和0.3cm,再次手术修补;1例后下缘残留细束样分流,直径0.15cm,随访6个月后自愈;10例膜周偏流出道型VSD患者剪开三尖瓣,8例垂直瓣环,2例平行瓣环;1例三尖瓣中度反流,随访无加重;5例轻度反流,4例轻微反流,随访均无加重;1例心包积液;1例再次进入手术室止血。

The windings in the valve side adopt prolonged delta connection providing the circuit for three-multiple harmonic currents, and implementing 12-pulse converter through fit ratio; this connection between the common winding and prolonged winding can decrease the current impact when phase conversion takes place.

该换流变压器阀侧绕组采用延边三角形接线,为3倍次谐波电流提供通路;通过匝比配合,实现12脉波换流;其延边绕组与公共绕组构成自耦变压器接线,可减少换流器换向时的电流冲击;在公共绕组上连接滤波支路,并调至谐振点,配之以变压器巧妙的零阻抗设计,可以在阀侧实现无功补偿,可实现网侧绕组中无5、7、11、13次特征谐波,即谐波屏蔽。

his paper mainly introduces the research activities conducted in recent years at CIAE in the field of high intensity cyclotrons, and some critical technologies we have as well as the research progress to date. The technologies presented in this paper include high intensity cyclotron physics; production, adjustment and control of high intensity H-ions; advanced magnetic technique, high-power and high-stability RF technology, vacuum and comprehensive cyclotron experimentations, etc.

本文主要介绍了中国原子能科学研究院自2000年以来在强流回旋加速器领域的研究工作进展和到目前为止所掌握的一些强流回旋加速器的关键技术,内容涉及强流回旋加速器物理,强流负氢束的产生、调节、控制与诊断技术,先进磁工艺技术,大功率高稳定度高频技术,真空技术,回旋加速器综合试验技术等。

ZT, GAs and ABA concentrations in xylem sap were lower than own-root plant. However, ZT and GAs contents were higher than the control but ABA decreased. In addition, the effect of grafting on increased yield was positive.

伤流液中玉米素、赤霉素和脱落酸的浓度均低于自根植株,但ZT和GA的含量高于自根苗,而ABA的含量低于自根苗。

Conventional video compression algorithms have higher compressibility, but the output code stream still needs recoding. A selfadapting arithmetic encoder was required in practical application to produce a final code stream, which can eliminate redundancy in binary code stream to obtain higher encode efficiency. QM arithmetic encoder is a high efficiency encoder designed for the simplicity and speed.

传统的图像压缩算法有较高的压缩码率,但生成的码流仍需要再次编码,实际使用中需要通过一个自适应的算术编码器才能生成最终的码流,以消除二进制码流中的冗余,得到更高的编码效率。

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