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.....
[更多]
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。
[更多]
The invention provides an electrical stimulation method as well as relative device and system thereof. The system comprises an output module and a stimulation module, wherein the output module obtains low-frequency and long-term electrical stimulation parameters and transmits the electrical stimulat.....
[更多]
本发明涉及河豚毒素的生物合成方法,包括获取具有一种或多种弧菌的培养,如通过种菌培养;将弧菌培养和产生TTX有机体的组织提取物加入发酵器中的培养基中;和从所述发酵器分离纯化TTX。本发明的方法在约3-5天的时间得到大约0.5mg/L的TTX产出,TTX的纯度至少为90%
[更多]
The invention relates to a method for extracting an area target of an image based on fuzzytopology, which comprises the following steps: an original image is treated in advance; an optimal threshold value T is dawn into; an object to be extracted is defined as a fuzzytopology object; the optimal thr.....
[更多]
|< <- | [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] | -> >| |