过渡压缩

It is assumed that it is adiabatic compression during start-up process before the atmophere pressure in flow passage rise to relief pressure, the thermodynamic equation, momentum equation and rigid water hammer theroy have been applied for the analysis and calculation the variation law of air during this transient process.

假设流道内气体未达虹吸驼峰顶处真空破坏阀排气压力前的起动过渡过程处于绝热压缩状态，运用能量方程结合动量方程和刚性水击理论，计算分析出了流道中的气体压力在起动过渡过程中的变化规律。

Considering that generation and maintain of small radius, high power beam is restricted by the compression ratio of electron gun, the effect of magnetic field on electron trajectories in transition region was analyzed.

分析了过渡区中电子注调节的基本原理，设计了一种渐变式的过渡区结构，其注腰半径为0.8mm，周期均匀磁场峰值为0.29T，周期为4.5mm，压缩比为22。

Numerical simulation and shaking table tests for acceleration response of piles in liquefiable ground were performed under three earthquake events.

结果表明：三种地震输入下，自下而上沿桩-柱墩长度方向，加速度峰值放大系数变化基本一致且均出现在10～20s时段内，加速度时程曲线的形状也极其相似；压缩0.15g El Centro波输入下加速度反应在砂土层与黏土层过渡带有增大趋势、在地表则有一定程度减小，且压缩0.15g El Centro波较0.15g El Centro波输入下均偏小，0.15g El Cen-tro波输入下自下而上桩的加速度时程幅值和峰值放大系数的试验值、计算值均一直有较大幅度增大；0.5g El Centro波输入下，加速度时程幅值的计算值和试验值在桩折断位置之下一直增大、至砂土层与黏土层过渡带则大大减小，加速度峰值放大系数的试验值和计算值在砂土层与黏土层过渡带突变增大、而在地表则明显减小，且较0.15g El Centro波输入下桩的峰值放大系数要偏小。

The heating mechanism of chromosphere from coronal soft X-ray radiation, was introduced self-consistently for first time; in numerical technique, we developed an elaborative method to resolve and track the transition region as well as chromospheric condensation.

在计算方法上，提出了增加辐射损失项循环来迭代求解动力学方程组的总体计算方法；并详细阐述了精确分辨和跟踪过渡区的网格调整方法，包括插入、消去和跟踪色球压缩区的方法，并就整个计算实现过程进行了讨论。

The main characteristics include: the quiet Sun corona has a rapid response to the flare heating, within 2 second the corona temperature increases nearly one order of magnitude, but later such increase becomes very slowly; the downward velocity at early stage of impulsive phase is too small to be negnected; chromospheric evaporation made by conduction shows some intensely, the maximum evaporated velocity may be as large as 1000 km/s; the chromospheric condensation appears just when the chromospheric evaporation takes place and its place always coincide with that of transition region in the early stage; the maximum of chromospheric condensation occurs also in the early stage of impulsive phase, at which the density in condensation may be larger two order of magnitude than that of surround and the downward velocity may be as large as 100 km/s; after the maximum of chromospheric condensation, its strongth decreases gradually but its width becomes greater with time and have a tendency to transport into deep chromosphere; the front of chromospheric condensation heats atmosphere obviously and the temperature in the chromospheric condensation is higher than the original case; the downware velocity of transition region may be greater than 100 km/s at the early stage; when the evaporated material collide at the top of loop, the densityand the presure there increase rapidly, which result in the formation of a shock wave; and so on.

在改善色球辐射损失和精确分辨过渡区的基础上，通过联立求解连续性方程、动量方程和能量方程，构造了一维磁限制性耀斑环在热沉积作用下的大气动力学模型，获得了耀斑热模型下脉冲相早期较为细致的大气演化理论图象，其主要特征是：耀斑对宁静日冕的加热相当迅速，仅2秒钟日冕温度增加即达一个量级，之后日冕温度增加缓慢；脉冲相早期日冕向下速度很小，几乎可以忽略，热传导驱动色球蒸发，其过程较为激烈，蒸发极大速度可达到1000km/s；色球压缩区与色球蒸发几乎同时形成，且在早期其位置总是与过渡区位置重合；色球压缩极大发生在脉冲相早期，其时密度可高于周围约2个量级，向下速度可超过100km/s；色球压缩极大后，其强度逐渐减弱，但宽度明显增大，且渐渐脱离过渡区往色球传播；压缩区内物质温度要高于原先的大气温度；过渡区下降在脉冲相早期相当迅速，可超过100km/s；当蒸发物质在环顶高速相碰时，环顶的密度、压力迅速增大，且温度也有所增加，导致形成激波，其波面以每秒上百公里的速度自环顶向下传播；在脉冲相前期，日冕软x辐射对色球的加热作用可以忽略；等。

Variable valve actuation is one of the most efficient methods to achieve homogeneous charge compression ignition and transition between HCCI and SI combustion on gasoline engine.

全可变气门技术是目前汽油机上实现均质充量压缩燃烧及HCCI与火花点火燃烧模式之间过渡最为切实有效的技术途径之一。

The re-enforcement fiber CPPf in the scaffold composites could significantly increase the density, porosity and elevate the compressive strength and rigidity in a content-depended manner, compared with simple scaffold PLLA prepared with same method. What's more, the inner microstructure could convert from microporous sponge structure of low porosity to fibrous network of high porosity.

PLLA支架材料中复合CPPf能够明显增加或增强相同方法制备的单纯PLLA支架材料的密度、孔隙度及压缩强度和刚度，而且随着支架材料骨架基质中所含CPPf重量比的增加，其作用更加显著，其内部微结构由较低孔隙度的微孔海绵状结构过渡为高孔隙度的纤维网状结构。

Several options of this screen saver maker are available: Most popular image file formats support (BMP, JPEG, GIF, PNG, PSD, TIF, PCX and so on); MIDI, MP3, WAV, WMA Background music support; Transition Effect support; Image Masking Effect support; Video/Flash Shape support; Customizable screen saver Dialog box, sell your screen saver option.

这几种选择萤幕制造者复本：最受欢迎的图像文件格式支持(骨、JPEG压缩、GIF型、巴布亚新几内亚、私营造瘘术，pcx等)；午、MP3及波、医协支持背景音乐；过渡效果支持；形象掩蔽效应支持；录像带/形状闪光支持；萤幕定制对话框，你卖萤幕选择。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失