The invention provides a three-dimensional ultrasonic imaging system which comprises an ultrasonic probe, a camera, a positioning module, an ultrasonic scanner and a computing module; wherein the camera is attached to the ultrasonic probe; the positioning module is placed within the viewfinder range.....
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一种电容式微加工超声换能器(CMUT)(200)，该电容器微加工超声换能器包括：操作地连接至顶部电极(210)的薄膜(220)和具有凹穴(230)的底部电极。在施加直流(DC)偏压时，所述薄膜(220)朝向所述底部电极挠曲，使得所述薄膜(220)的周边边缘区域接近所述底部电极，并且所述薄膜的所述周边边缘区域附近的静电力得到增加。
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The present invention provides a processing method of a low-torque single-strand ring spinning yarn and an apparatus thereof. The device comprises a ring spinner, a false twister between a pair of front rolls and travellers of the ring spinner for controlling and adjusting the arrangement structure .....
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A vertical micro-injection molding machine, comprising: a plasticizing unit, which features a conveying path, the conveying path in which the molten material has a screw conveyor; an injection means for receiving from a good measure of the plasticizing unit molten material; one injection molding, fr.....
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本发明涉及具有形状记忆性的聚氨酯、水性形状记忆聚氨酯组合物及其制备方法、形状记忆织物及其制备方法。所述聚氨酯为将下列组分反应制备的预聚物在水中继续反应所得到的聚合物：二异氰酸酯；含羟基低聚物；含有活泼的氢基团的扩链剂和含羧基的扩链剂；含有碱性基团的中和剂；封端剂；交联剂以及任选的催化剂，其摩尔比为二异氰酸酯∶含羟基低聚物∶扩链剂∶中和剂∶封端剂∶交联剂∶催化剂＝０．８～１．６∶０．２～０．８∶０．４～１∶０．２～０．６∶０～１．２∶０～０．４∶０～０．０２其特征在于所述聚氨酯以不同摩尔数量的异氰酸根和羟基（ＮＣＯ／ＯＨ＝０．８～１．６）封端，所述聚氨酯具有在－３０～１００℃范围内的形状转变温度.....
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