查询词典 helical

By using the non-instantaneous section envelope machining principle , a mathematical model of mold grinding helical-spur cylinder gear is established,which is a calculating method to shape axile sectional of grinding wheel for numerical control mold grinding helical-spur cylinder gear.

利用无瞬心包络法成形加工的原理，建立了成形磨削斜齿圆柱齿轮的一种数学模型，为斜齿圆柱齿轮数控成形磨削的砂轮轴向修形提供了一种计算方法。

The formation mechanism of the hollow and helical fibers was proposed. During the heat treatment, the hollow fibers could be formed when the inner gel of the thinner precursor fibers was separated from the center and contracted to surface. However, the helical fibers could be generated when larger gel fibers were broken helically under thermal stress in the process of gel decomposing and contracting.

分析了中空纤维和螺旋纤维的形成机理，直径较小的前驱体纤维在热处理过程中内部凝胶向表层迁移收缩形成中空纤维；螺旋纤维是由直径较大的前驱体纤维在热处理过程中产生的强大的热应力导致纤维产生螺旋破裂形成的。

Notably, compounds 12–14 can be described as a 3D open–framework with nano–channels, compound 15 can be described as a 3D open–framework with double helical channels, while compound 16 can be described as a 3D heterochiral coordination polymer with double helical channels, which can be obtained by spontaneous resolution from the racemic phosphonic acid.X–ray powder diffraction analysis shows that compound 16 is a pure phase. Surface photovoltage spectroscopy of compound 16 indicates that it possesses positive SPV response in the range of 300–600 nm and shows p–type semiconductor characteristic.

值得注意的是，化合物12-14为具有一维纳米孔道结构的三维开放骨架结构，化合物15是具有双螺旋孔道的三维开放骨架结构，而化合物16是外消旋的有机膦酸配体通过自发拆分而形成的具有双螺旋孔道的多手性三维开放骨架结构。X-射线粉末衍射分析表明化合物16为纯相；化合物16的表面光电压光谱分析中，在300-600nm范围内有3个正的光(来源：ABC论文12网www.abclunwen.com)伏响应带，表明它具有p型半导体的特征；化合物16的诱导表面光电压谱进一步确定它的p型半导体的特征；磁性研究表明，化合物16中两Mn原子之间存在弱的反铁磁相互作用。

Objective To analyze the contrast enhancement appearances and patterns on dual phase helical CT scans in 21 cases with hepatic hypervascular metastases, and to discuss the value and pitfall of helical CT in diagnosing hepatic hypervascular metastases.

目的 分析 2 1例共 6 3个富血供肝转移灶在螺旋CT双期扫描中的表现，探讨螺旋CT在该病诊断中的价值和限度。

The results indicate that [(L 1) 2SnEt 2] can selectively bind to the N 1 atom of the base and the phosphate oxygen atom of AMP and may further destroy the helical structure of DNA, while the dimethyltin compound of 1,3 dimethyl 4 acetyl 5 pyrazolone [(L 1) 2SnMe 2] merely binds to the the phosphate oxygen atom of AMP and causes the contraction of DNA helical structure.

结论3 二甲基 4 乙酰基 5 吡唑酮的二乙基锡配合物(L1 ) 2 SnEt2 可与AMP 的碱基N1 和磷酸根氧原子螯合并可能会破坏DNA 的双股螺旋结构；而二甲基锡配合物(L1 ) 2 SnMe2 易与单核苷酸的磷酸氧结合，难以与单核苷酸的碱基氮原子稳定结合且只引起DNA 双股螺旋的收缩

Adjacent helical chains are racemic. The Ag atom is linked to two nitrogen atoms of the 2-pyridyl and 4'-pyridyl groups from two different 2,4'-bpy ligands as well as to the oxygen atom of the counterion. In 17 and 19, the adjacent helical chains are linked to wavy two-dimensional network structures by the nitrate counterions.

相邻的螺旋链间是外消旋的，Ag 原子与分别来自两个不同2，4'-联吡啶的2-吡啶基和4'-吡啶基的氮原子以及阴离子的氧原子配位，在配合物17和19中，相邻聚合螺旋链被硝酸根离子桥连接起来，变成了一个波浪形的二维网络结构；配合物18是首次通过无桥连配体支持的Ag ××× Ag键将相邻螺旋链连接成二维非穿插的网络结构。

Main products include helical gear units,spiral-bevel gear units,planetary gear units,bevel-helical gear units,worm gear boxes,Screw jacks,speed variator,power ranges 0.12-9550kw customer-designed,combined-designed products are also available which also achieve great success.

产品主要有斜齿轮、螺旋锥齿轮、行星齿轮、蜗轮减速机、螺旋升降机、无级变速机、功率覆盖0.12-9550kw的标准系列，及各种专用、组合和非标设计产品被广泛应用，并有骄人的业绩。

The results show that the precooling time of the probe is shortened significantly with the help of the vapor liquid separator, and decreases with the driven pressure. With the helical coiled wire and the helical mesh, significant thermal Oscillation corresponding the density-wave is observed in the precooling time. The average heat transfer coefficient enhances 1.5 times with the mentioned heat transfer enhancement techniques, and the temperature of the 2.5 min cryoprobe surface can reach -160℃ in 17℃ brine within 10 min.

结果表明：使用了快速预冷汽液分离器后，探针预冷时间大大缩短，并随驱动压力增大而减小；加入螺旋丝和螺旋丝网后，在预冷阶段出现明显的热力振荡，并伴有密度波振荡，平均换热系数为原来的1.5倍，在17℃生理盐水中10min时2.5min探针表面温度最低可达－160℃，大大提高了探针的冷却性能。

Product Series: Company main products has EWR series Helical gear reducer, EWS series helical gear - worm gear reducer, EWK series bevel gear reducer, such as eleven major series, a total of more than 10,000 transmission ratio, specifications as much as the domestic industry leading position.

公司主要产品有EWR系列斜齿轮减速机、EWS系列斜齿轮—蜗轮蜗杆减速机、EWK系列锥齿轮减速机等十一大系列，共计10000多个传动比，规格之多居国内同行业领先地位。

High viscosity gear pump gears are commonly straight teeth, helical gear, herringbone gear,节流阀, helical gear, tooth profile and the main arc of involute type.

高粘度齿轮泵，调节阀的齿轮常见的有直齿、斜齿、人字齿、螺旋齿，齿廓主要有渐开线和圆弧型式。

Do not gum up the work by telling mother what we are going to do .

别告诉母亲我们要干的事，那会把事情搞糟的。

In recent years, application of the partial prestressed concrete beam s is developed.

近年来，随着部分预应力砼梁应用的推广，发现我国规范所采用的名义拉应力法的计算结果不稳定。