螺旋管

An investigation on the local heat transfer coefficient of a helically segmented finned tube surface in a tube bundle was conducted by experiment in cooperation with numerical calculation.

对齿型螺旋肋片管管束内部沿管表面周向的局部放热系数进行了研究。

These results may be useful in designing helices BWT or TWT .

这些结果可用于螺旋线返波管或行波管的设计。

To achieve this aim, one has to studying the growth mechanisms of CNTs, finding out how CNT nucleates, why growth teminates, how to control the diameter and chirality etc. Thus the goal of this study is to clarify the growth mechanisms and achieve controlled synthesis of CNTs.

而要实现这一目标，就必须研究清楚碳纳米管的生长机理，弄清楚碳纳米管是如何成核，为什么生长自动终止，如何控制管径，如何控制螺旋度等问题。

Through experimental methods,an experimental study has been performed of the dynamic characteristics of heat exchangers with continuous spiral baffle plate s,which have water and oil to serve as heat exchange working media.

建立了可进行壳管式换热器动态特性试验研究系统，通过试验研究的方法对水-油为换热工质的连续螺旋折流板管壳式换热器动态特性进行了试验研究，进口流量扰动为等百分比流量特性，研究了4种流量扰动方式下水和油出口温度的动态响应。

Main production the following: single-Doo on coal, ring and belt conveyor raise more fighting, TD75 series of conveyor belts and DDJ steep conveyor belt, CG-trough feeder, Permanent Magnetic Separation, Cleaner Machine: heavy chain, ring chain, linked plate, the main boiler linked films, spiral Cleaner and other chain-Cleaner, SM-economizer, FB-explosion-proof doors, air preheater, ceramics and more of the dust collector, Ceramic multi-desulfurization dust collector, self-water bath desulfurization dust collector, XLP type, XZD-cyclone, muffler.

主要生产以下产品：单斗上煤机、圆环和皮带多斗提升输送机、TD75系列皮带输送机和DDJ大倾角皮带输送机、CG型槽式给料机、永磁磁选分离器、除渣机：重链、圆环链、板链、锅炉主链片、螺旋除渣及其它链条除渣机、SM型省煤器、FB型防爆门、空气预热器、陶瓷多管除尘器、陶瓷多管脱硫除尘器、自激水浴脱硫除尘器，XLP型、XZD型旋风分离器、消声器。

The company has three advanced spiral paper tube production lines and related equipment (sub-machine, precision cutting machine, precision machine and efficient drying room) andìprocessing equipment, according to the needs of users develop, produce many varieties, many specifications, the versatility of the new products.

公司拥有三条先进的螺旋纸管生产线及相关设备（分条机、精切机、精整机和高效的烘干房）和异型管的加工设备，可根据用户的需求开发、生产多品种、多规格、多用途的新产品。

These were raised underinducing condition to test if any morphology and structure changes. Twenty two Arabidopsismutants had various changes in morphology and anatomical structures. Twenty mutants hadlow germination rate from 10% to 60%, of which 2 had survival rates at 0% and 50%. Fivemutants occurred structure changes in the hypocotyls or stem. One of these lines, namedarris-stem, showed some unique changes: slower growth rate in comparison with the wildtype from germination to florescence; serrated margin of leaf blades, spiral rosette; morebranch in the bottom part of the stem, shorter nodes, twisted stem and branch. There were oneor several arrises along the stem. Across sections of the arrises showed one or several compactcells lumps which were round, made up of several layers of cells, looked like vascular-bundle.

在诱导条件下，这些突变体表现出不同的形态和结构的变化，共有22个表型和结构发生变化。20个突变系发芽率或存活率较低，发芽率由10％—60％，其中2个突变系存活率分别为0％和50％。5个突变系在茎或下胚轴的结构上发生变化，其中一个突变系arris-stem发生如下表型变化：从真叶出现至开花结实的整个生长期，生长速度要明显比野生型拟南芥缓慢；叶缘有明显锯齿，莲座叶呈螺旋状排列；茎的基部有较多侧枝，侧枝间距明显缩短，茎有明显扭曲；突变体茎侧面有1至数条棱形突起，内部存在一至数个排列紧密的细胞团，由多层细胞呈环形排列，细胞壁明显加厚，内部存在管状分子，推测为维管组织。

Phages usually have complex capsids composed of a polyhedral head, containing the nucleic acid, and a helical tail, through which nucleic acid is injected into the host.

噬菌体通常由复杂的衣壳组成一个多角体的头部，包含有核酸（ DNA 或 RNA ）和螺旋状的尾管，通过这个尾管核酸可以被注入寄主的体内。

As the increasing of helix angle, the film thickness becomes more uniform.

结果表明，与水平光滑圆管相比，水平螺旋槽管表面的液膜变薄且分布变均匀。

The distribution of the liquid film was got, and the effects of helix angle, geometry of the channel, liquid mixing and liquid properties on the liquid film was also studied.

考虑表面张力和重力的作用，利用流体力学的基本方程建立单组分流体在水平螺旋槽管的管壁形成液膜的拟线性模型 3。

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。