对流

Nitrogen screen, rare factive gas and nuclear heat are the mainly compos it ion.

其中稀薄气体对流热、辐射热和核沉积热是热负荷的重要组成部分。

The research contents and main conclusions are as follows:1. The present thesis adopted one-dimension interior ballistic model, regarding the ballistic spatial core as the unsteady quasi one-dimension airflow containing the friction and heat exchange between airflow and tube wall, considering the boundary layer unsteady, nonstationary condensable current; and employed the MacCormack finite difference method to write the program.

本文的研究内容及结论主要体现在以下几个方面： 1、采用了一维内弹道模型，把弹后空间的核心流部分考虑为包含气流与身管管壁发生摩擦和热交换的不稳定准一维流，边界层考虑为不稳定、非定常可压缩流，用MacCormack有限差分方法求解，编制程序进行计算，较为准确的得到了复合材料身管固壁瞬态温度场分析内边界条件所需的气流温度和对流换热系数结果。

The other result was given by this paper from the other view.The assumption was that the precipitating electrons would act on a plasma flux tube,which convect through cusp region,or not.

本文还给出了统计对流模型作用下磁流管在经历极隙区时，有沉降粒子作用和没有沉降粒子作用两种情况下，F层等离子体的时间变化过程的差异。

The instrument adopts high performance heater which heats from the top and both sides, then the heat will be forced to convect by fan. All the electric devices are installed in the upper part of the oven.

仪器采用高性能发热器从上部及两侧发热，再由风机强制对流送热，全部电器设备均安装于箱体上部。

The indicator light is lit, the switch of fan shall be turned on as soon as the instrument is warm, so that the heat produced can be forced to convect through the air channel.

指示灯亮，仪器加温后即应打开风机开关，使其热量往风道强制对流。

Before establishment of SEASM, if southerly moisture transportation through the meridional moisture channel is very strong, the convection activity becomes more active around the IndochinaPeninsula and the rainy season begins earlier in Yunnan corresponsively.

当这一水汽通道中南风水汽输送在季风建立前异常偏强时，相应地中南半岛附近的对流也增强，对应着云南的雨季开始偏早，初夏降水偏多，反之则初夏降水偏少。

For less active convection, cumuliform clouds grow with less rapidity.

当对流不太活跃时，积云增长不太快。

The mesoscale cyclonical feature in the surface stream near the coastal areas is not apparent while the typhoon approaching the main land. The surface southeast current of typhoon is divided into an east current and a southeast current, making for confluence of local currents and convection.

当台风移近大陆时，靠近沿海地区的地面流场中尺度涡旋特征并不明显，主要表现在台风近地面偏东南气流出现分支，形成偏东与偏东南气流，有利于在沿海地区形成局部气流汇合并引起或增强对流。

Temperature field in the sinter process of magnetic ferrite was numerically simulated by using finite element method. Temperature distribution of workpiece during the sinter process is concluded, where it indicates different sinter stage and different diathermanous mode. Also critical temperature is gained, it differentiates between low temperature stage mainly with convection and high temperature stage mainly with radiation.

利用有限元分析法对永磁铁氧体材料烧结过程温度场进行了数值模拟研究，得出铁氧体磁瓦在烧结过程的不同传热方式下、不同烧结阶段的温度分布规律，得出了烧结过程对流传热为主的低温阶段与辐射传热为主的高温阶段的分界温度。

Therefore , the quenched dioritic enclaves in subvolcanic granodiorite in Xiangshan were formed by the convection of the magma with different composition and temperature and by the heterogeneous mingling between them. These enclaves are genetically quenched enclaves.

因此，相山潜火山岩岩墙中的闪长质岩石包体是不同成分、不同温度的岩浆经对流及不均一岩浆混合作用而形成，在成因类型上属淬冷包体。

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％。