Analytical Solution for Coupled Extensional-torsional Free Vibration of the Helical Spring

Theoretical analyses show that the longitudinal vibration of a long slender rod, the radial and thickness extensional vibration of a thin plate can be obtained from the theory in this paper. Compared with numerical methods, the method of this paper is very simple.

理论分析表明，压电陶瓷细长棒的纵向振动，薄板的径向及厚度振动等都可由本文理论导出，与数值法相比，本文理论计算简单，物理意义明显。

The computation shows that parameters reflecting the tangential stiffness have more significant effects on torsion mode of structure than those on extensional vibration mode and flexural mode.

结果表明，描述结合面切向刚度大小的参数对结构的扭振刚度模态的影响比对纵向振动模态和弯曲模态的影响显著；

In this article, form the physical principle, the model and the equivalent circuit of thickness extensional vibration mode of thin film transformer is built.

本文从基本的物理学原理入手，建立了纵纵式厚度伸缩薄膜压电变压器的物理模型以及等效电路。

The parameters reflecting normal stiffness have more obvious effects on extensional vibration mode than those on flexural mode and torsion mode.

结合面法向刚度大小的参数对纵向振动模态的影响比对弯曲、扭振模态的影响显著；

As you can see from the examples in this article, the designers of the W3C XML Schema language had extensibility in mind when they created the standard.

如本文示例所示，W3C XML Schema语言的设计者们在创建这个标准时考虑了可扩展性。

Community antenna television line extender

公用天线电视线路扩展器

At present, owing to battery technology and battery charging time of electric vehicle, the driving range is limited, so interest is growing in range extender researches.

但目前由于纯电动车充电时间和充电技术的限制，使得纯电动车辆续驶里程不长。

Recent models such as the Nissan Leaf and the BMW i3 are limited to go under 100 miles-though BMW offers a range extender in the form of a petrol-driven engine to recharge the battery as it drives.

最近推出的日产聆风（Nissan Leaf）和宝马（BMW）i3等车型的续航里程不到100英里，尽管宝马电动汽车在行驶时可以用汽油发动机为电池充电，将其用作一种里程扩增器。

but you also have the perfect range extender.

而且你有最完善的范围扩大设置。

Extender: A white pigment used with a coloured pigment either to reduce its strength or improve its working qualities.

冲淡剂：白色颜料，用来混合有色颜料，使色量降低或改善使用性能。

Barium sulfate as an extender pigment is widely used in paint.

硫酸钡作为体质颜料广泛应用于涂料中。

Aromatic extract oil can be utilized in many chemical fields, e.g. it can be used as active additives in vacuum distillation unit and solvent deasphalting unit, rubber extender oil and process softening agent in rubber industry, thermal conducting oil and printing ink solvent.

炼油厂重质芳烃油有多种化工用途，可作为蒸馏工艺强化剂、优化溶剂脱沥青工艺添加剂、橡胶工业的橡胶填充油和工艺软化油、工业导热油、黑色油墨溶剂油等。

The chromaticity, miscibility and anti-yellowing of SBS rubber extender oil produced by these technologies, which raw material was naphthenic-base or medium-base crude oil, could reach quality standard of the same overseas product and satisfy domestic market requirement.

利用这些技术分别以环烷基、中间基原油生产的SBS橡胶填充油的色度、相溶性、黄变性能等指标均达到国外同类产品质量水平，满足了市场需求。

All the ten grades of oils are suitable to be used as extender oil, and among them grade 8 and 9 oils possess the characteristics of light colour and good stability as well as relatively good compatibility with SBS thermoplastic elastomers.

试验证切，10种环烷油均可作SBS填充油，其中8~、9~两种油具有色浅，稳定性好的特点，而且与SBS有较好的相容性。

Ten grades of naphthenic oils produced by Dagang Oil refinery were evaluated as extender oil for domestic SBS thermoplastic elastomers.

以大港油田炼油厂生产的10种环烷油作填充油，国产SBS为基础胶，从工艺条件，油品质量及其对充油SBS性能的影响方面对填充油进行了评选。

The results indicated that with the increase of the content of the extender oil, the tensile strength decreased, while the elasticity increased and elongation at break improved.

结果表明：随着填充油用量的增加，拉伸强度下降，弹性回复增加，断裂伸长率也增大。

Effects of extender oil on the structure and properties of styrene-[ ethylene-( ethylene-propylene)]-styrene block copolymer

填充油对聚苯乙烯-b-聚〔乙烯-（乙烯-丙烯）〕-b-聚苯乙烯结构与性能的影响

The electromagnetic expulsive force exerted on the inclusion is not remarkable when the principal axis length is long in the direction of the magnetic field and short in the direction of the electromagnetic force.

当夹杂在磁场方向的主轴长度较大，并且在电磁力方向的主轴长度较小时，夹杂所受电磁斥力不显著。

Objective To observe the clinical effect of PCEA on expulsive pains.

目的观察PCEA用于分娩镇痛的临床效果。

In the active and expulsive stage, the VAS sores of group ⅰ and ⅱ were lower than those of group ⅲ( P < 0.05).

在分娩活跃期和第二产程，Ⅰ、Ⅱ组VAS明显低于Ⅲ组（P<0.05）。