preforms
v.
预先形成( preform的第三人称单数 )；
英英释义
preform
v.
form into a shape resembling the final, desired one
form or shape beforehand or determine the shape of beforehand
双语例句
用作及物动词(vt.)
The superior preform of composites is a basic requirement and one of key factors for fabricating superior properties composites.
摘要高质量复合材料预制块是获得高性能复合材料的基本要求和关键要素之一。
An algorithm of three-dimensional braided composite material preform image proce ssing based on mathematics morphology is presented.
提出一种基于小尺度的数学形态学的三维编织复合材料预制件图像的边缘检测方法。
权威例句
Preforms and optical fibers coated in alumina and/or silicaSol-gel-based optical preforms and methods of manufacture
OPTICAL PREFORMS FOR SOLID STATE LIGHT EMITTING DICE, AND METHODS AND SYSTEMS FOR FABRICATING AND ASSEMBLING SAME
RETRACTED: On the microstructure of three-dimensional braided preforms
Carbon composites based on multiaxial multiply stitched preforms. Part 1. Geometry of the preform
Carbon composites based on multiaxial multiply stitched preforms: finite element modelling of elastic behaviour
Carbon composites based on multi-axial multi-ply stitched preforms. Part 4. Mechanical properties of composites and damage observation
Carbon composites based on multiaxial multiply stitched preforms. Part 2. KES-F characterisation of the deformability of the preform...
Nondestructive measurement of axially nonsymmetric refractive-index distribution of optical fibre preforms
Carbon composites based on multi-axial multi-ply stitched preforms – Part 6. Fatigue behaviour at low loads: Stiffness degradation ...
1. The porosity of preforms increased with the increase of starch contents.
随着造孔剂含量的增加，预制体气孔率升高。
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2. With the fabricated preforms, the pressure casting process of porous aluminum alloy was studied.
利用所制备的预制块，研究了多孔铝合金的加压铸造工艺。
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3. Introduces the structures and weaving technology of 3D fabric preforms with various shapes, which can be used as references to develop the fabrics for the reinforcement application.
对非平面状3D织物（预制件）结构、型材及其织造技术进行了介绍，希望能为国内发展纤维增强复合材料用织物提供参考。
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4. This analysis describes yarn structure of braided preforms after reducing-yarn and obtains the movement rule of braiding yarns.
通过对预制件的细观结构的研究，得到减纱后通过减纱截面纱线的运动走向和规律；
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5. Resultingly limitation of equipment, it is difficult to densify the spray deposited preforms with large dimension by extrusion.
而采用挤压等工艺，由于受到设备的限制，无法实现大尺寸坯料的变形。
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6. The final yarn structures in composites have changed comparing with those in the preforms after which are impregnated with matrix and consolidated into the final shape.
与预制件相比，复合材料内部的纱线结构发生了变化，这种变化也体现在纤维体积分数以及其它结构参数上。
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7. Preforms with homogeneous distribution of large and small particles are made by ultrasonic dispersing technology.
用超声分散工艺获得了不同粒径颗粒分布均匀的预制件。
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8. It is prerequisite to measure the three-dimensional braided composite materials preforms technical parameters in the process of its design and production.
在三维编织复合材料预制件的研制和生产过程中，需要测量和分析材料的工艺参数。
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9. This paper introduces the advantage of PCVD method and describes the long PCVD equipment for making optical fiber preforms, performance parameters and the overview of applications.
介绍了PCVD制棒法的优点，描述了实用型PCVD法制造光纤预制棒系统的设备组成内容、性能参数及其推广应用的前景。
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10. On the simultaneity, the actual shape of the yarns in performs was observed, which will be beneficial to the foundation of the cell modal in preforms.
同时，通过实验观察了预成型件中纱线的实际形态，为三维六向编织预成型件单胞模型的建立奠定了一定的基础。
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11. In the hot repressing of the powder sintered preforms, the increasing forging force increases its densities at a constant temperature.
在相同温度下进行粉末烧结体热复压，锻造力的增加往往使锻造密度也增加。
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12. This paper introduces the fabrication technology for knitted preforms. In-plane and out-of-plane Mechanical properties are studied which are compared with those of woven composites.
本文介绍了针织复合材料预型件的制造工艺：研究其面内和面外力学性能：并与机织复合材料进行了比较。
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13. The plugging of the surface pores in the preforms which often occurs in isothermal CVI technology seldom happens in the thermal gradient CVI process, namely, the overcrusting is avoided.
热梯度化学气相沉积工艺中避免了等温沉积工艺中预制体表面孔隙过早堵塞的现象，适合制备轴对称的环形、管型件。
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14. The fabrication technology of fiber preforms for liquid composite molding ( LCM ) is an important aspect on cost-effective composites.
纤维预成型技术是复合材料液体模塑工艺（LCM）低成本化中的重要方面。
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15. The production of three dimentional spherical reinforced preforms by means of one-side-sewing technology is presented.
介绍了通过单面缝纫技术生产三维球面增强预型件的方法。
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16. The results indicated that by HIPing porosities in the preforms can be closed and the densities can be increased, then the strength and ductility can be improved.
结果表明，热等静压处理可以闭合坯件内的疏松孔洞，提高合金致密度，进而提高合金的强度和塑性。
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17. High quality preforms are important for discontinuously reinforced composites made by the pressure infiltration method.
采用压力浸渗方法制备非连续增强复合材料需要高质量的预制块。
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18. Intermediate beaded or rolled edge multilayer metal preforms are made for transport to the final three dimensional stamping operation.
制成半成品卷边或滚压边的多层金属预成形件用于该产品的最终冲压成形加工工序。
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19. Some problems of design for powder hot forging die have been discussed around the characteristics of forging deformation of powder preforms.
围绕粉未烧结体锻造变形的特点，讨论了粉末锻造模具设计的若干问题，并对一些粉末锻造模具进行了分析。
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20. This equipment possesses the ability to produce rapidly solidified fine alloy powders and atomizing deposition preforms.
该装置可用于制备快速凝固合金粉末或雾化沉积毛坯。
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21. Research status at home and abroad on manufacturing techniques of composites with interpenetrating networks and their preforms were summarized, with focus on the special feature of every one.
总结了国内外在网络互穿复合材料及其预制件的制备工艺方面的研究现状，并且指出了各种工艺的特点；
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22. In this paper, densification laws of rotary forging powder sintered preforms and the property of components have been investigated with orthogonal experiment method.
本文利用正交实验等方法在自行设计的实验装置上对粉末烧结体的摆辗致密规律及压实体的性能进行了研究。
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23. Spray forming is a novel manufacturing technology of materials that combines rapid solidification and near net shape forming to make bulk metal or alloy preforms with desired shape and size.
喷射成形（或称喷射铸造）是一种新兴的材料成形技术，它具有用快速凝固的方法直接制备大块金属材料的特点，同时还可以控制坯件的形状和大小。
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24. Three weaving methods of cone-shaped tubular woven preforms were discussed.
分析了三种锥形管状预成型机织物的织造方法。
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25. This paper presents the new technique for preparing the fiber preforms with large core and large N A by the conventional MCVD process.
本文介绍利用现有MCVD工艺制备大芯径、大数值孔径光纤预制棒的新工艺。
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26. The densification rate of the surface layer of the preforms was the most fast.
在轧制过程中，轧件上表面的致密化速度最快。
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27. The densification rate of the surface layer of the preforms was the most fast.
在轧制过程中，轧件上表面的致密化速度最快。
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28. In the second stage, room temperature preforms are reheated, stretched and blow moulded into bottles, in a reheat stretch blow moulding machine.
第二步将室温的瓶坯再加热后，拉吹成为瓶子，是在另一台“再加热，拉吹机”上完成。
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29. Plastic shrinks during cooling. Holding packs more material in to take up the shrunk space so the preforms are without sink marks.
在冷却时间内，塑料不断收缩，而保压填补收缩了的空间，使瓶坯饱满，不会下陷。
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30. During low seasons, preforms could still be produced for blow molding during high seasons.
淡季生产的瓶坯可在旺季吹成瓶子。
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31. Bottlers could choose to buy the equipment for the second stage and purchase preforms for reheat stretch and blow moulding. This will reduce investment in training and equipment.
灌瓶厂可以选择只买第二步的设备，将购买回来的瓶坯吹塑成型。这样便可以减少投资(人材及设备)。
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preforms
