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In this paper, a series of low cross-linking polyurethanes are synthesized using polycaprolacton or polybutamethylene adipate or polyethylene-propylene adipate, MDI and glycerin. Their mechanical, thermal and dynamical properties and shape memory function are studied.

采用聚己二酸乙丙二醇酯、聚己二酸丁二醇酯、聚己内酯和 4,4'-二苯基甲烷二异氰酸酯为原料,以丙三醇为交联剂合成了一系列低度交联的聚氨酯,讨论了组成、配比等对性能的影响,比较了它们和线型聚氨酯在性能上的差别。

On the basis of OCM, segmentation based on curvature radium is presented in the paper, in which curvature radium is calculated using parametric-surface fitting, and detecting edge points is realized from orthogonal direction, which ensure the integrality of edge points. Since the data is organized by cross-line in OCM, a new arithmetic, Double-direction Angle Difference arithmetic, is brought forward, which can pick up edge points more quickly.

物体的表面一般由多个曲面相交组成,要建立完整的几何模型,需要对测量数据进行区域分割——区分不同曲面的数据,现有的区域分割大多是对单视图的图像式测量数据进行的,但完整的CAD模型需要联合多个视图产生,本文在上面提出的三维正交模型的基础上,提出了三种区域分割方法:第一种方法是基于曲率半径的数据分区方法,通过二次参数曲面拟合计算局部曲率半径,从正交的多个方向进行检测,保证了边点提取的完整性。

This paper discussed the present situation and existent problems of the auxiliary test system of variable frequency withstand voltage for cross-linking cable on-the-spot, as well as the designs and applications of auxiliary test system.

文章论述了交联电缆现场变频耐压辅助试验系统的现状和存在问题,以及辅助试验系统的设计和应用,介绍了辅助系统的作用和组成。

The structure and characteristic of the band-pass filter are analyzed,and parameters of components are calculated,and a Back-EMF zero-cross detection circuit for BLDC motor sensorless control is designed in this paper.

分析了带通滤波器的结构、幅频和相频特性,计算获得了符合要求的参数,设计了由带通滤波器构成的无刷直流电动机无位置传感器控制用反电动势过零检测电路,并给出了该检测电路的简化型式。

In this paper, the forecast and prevent China Telecom operator's cross-border mergers and acquisitions risks of enterprises financing risk must be directed against uncertainty and information asymmetry.

因此本文对我国电信服务行业跨国并购的风险的预测、防范和控制都是针对于不确定性和信息不对称的。

The effects of genetic purifying by continuous sibling-cross on the damaging character of biotype 1 and biotype 2 of Brown Planthopper were studied in this paper.

采用标准苗鉴法,系统考察了褐飞虱生物型1和生物型2的致害特性在连续五代家系纯化过程中的变化状况。

This paper examines how Ciceronian rhetoric, embraced with such enthusiasm by Jesuits, made their early cross-cultural missionary encounters in Asia so remarkably thriving, and how those interactions might still be a source of inspiration for those engaged in education in contemporary China.

本文探究了西塞罗修辞学是如何拥抱来自耶稣会士的这种激情,使他们早期在亚洲开展的跨文化传教接触如此兴盛,同时也探讨了这些互动如何可以继续为那些在当代中国从事教育的人们提供灵感的源泉。

In this paper, cross ratios of the four collinear points and five coplanar points were analyzed first, then some affecting factors were concluded, and some constraints were proposed on constructing model-based object recognition system.

首先对共线4点和共面5点构成的交比不变量的稳定性进行了分析,得出了影响稳定性的因素,然后提出在构造目标识别系统的模型时应注意的约束条件,实验表明:在这些条件下构造模型的抗噪声能力大大提高。

In this paper,the monomers including St and BA with strong waterproof property were employed to modify the traditional PVAc emulsion,and meanwhile draw into DAAM functional monomer in the copolymer system,will prepare out cross linking copolymer emulsion for ADH to improve the waterproof,oilproof and dry/wet mechanical property of fuel oil filter paper.

采用具有较强抗水性的苯乙烯、丙烯酸丁酯等单体对传统聚醋酸乙烯酯乳液进行共聚改性,并在共聚体系中引入双丙酮丙烯酰胺功能单体,制备出可通过外加己二酸二酰肼交联的外交联醋丙共聚乳液,以期提高燃油滤纸的耐水、耐油性和干湿态的力学性能。

The results of the study showed that:① Using dozens of kilograms of explosives the signal can be detected at distances up to 200 km;②Active source has a certain degree of repeatability among different shots;③This paper presents the following shooting mode and signal detection method based on the similarity of different shots: In light of the similarity between the signals of big shot and small shot, this paper presents a cross-correlation method using signal from big shot signal with high SNR and small shot signal to detect weak small shot signal, the method can effectively detect the small shot signal and pick up the start time of phase, this method can help us make full use of past seismic exploration data records.

野外实验采用1次大当量激发和16次小当量激发,研究结果表明:①有可能利用数十公斤当量的炸药实现200km距离的探测;②在激发条件相同时,不同当量的激发波形滤波后存在一定的相似性;③依据人工震源可重复性采用以下的激发组合方式和处理方法能够有效提高信噪比:针对大当量激发与小当量激发波形的相似性,利用大当量激发的波形作模板与小当量激发的波形作相关,可判断台站是否接受到小当量激发的信号并检测其震相到时信息。

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