查询词典 electrets

Methods: Polytetrafluoroethylene and polypropylene film electrets were prepared by constant voltage corona charging at room temperatures. The charge-store stability of PTFE and PP were studied by measuring isothermal surface potential decay after different dose of ultraviolet radiation.

用常温恒压电晕充电系统将聚四氟乙烯和聚丙烯两种材料极化制备成驻极体；用补偿法测量不同剂量的紫外照射后驻极体的表面电势。

Results:(1) After 24 h action of negative electrets, electrophoretic mobility and cell number in S phase of 3T3 cells were significantly increased compared with those in control group.

结果：(1)负极性驻极体作用成纤维细胞使细胞的电泳率和S期内的细胞数显著增加。

And it comes to a conclusion that electrets can be made not only into a kind of material providing homogeneous electric fields but also into a kind of ventilative electrostatic shielding material.

利用驻极体具有的可任意切割、拼装、黏接的特性，从静电学的基本规律及由泊松方程构成的静电边值问题出发，对驻极体既可对外提供电场又可设计为屏蔽电场的 2个相异思维的研究结果展开了讨论，从而，从理论上指出驻极体既可以制成提供均匀外场的材料又可以制成一种透气性静电屏蔽材料。

The improved positively and negatively corona charged PTFE film electrets not only have a comparable charge storage density but also similar rule for their charge storage and decay in certain temperature region.

经改性后的正、负极性PTFE薄膜驻极体不仅具有相近的电荷储存密度，而且在一定的温度区间内它们的电荷储存和衰减呈现类似的规律。

Negative electrets can enhance apoptosis of fibroblast cells.

负极性驻极体有促进成纤维细胞凋亡的作用。

It is suggested that both film electrets have good charge-storage stability under the standard clinical ultraviolet disinfection intensity and dosage.

在临床紫外消毒强度和消毒剂量照射下，PTFE和PP均表现出良好的电荷稳定性。

Objective: To evaluate the effects of charged surfaces on the activity of bone marrow stromal osteoblasts, and to discover the osteogenic potential of electrets of different surface charges.

目的 研究驻极体产生之静电场对骨髓基质成骨细胞形态及功能的影响，初步探索利用驻极体引导骨定向生长的可能性。

In this paper, charge dynamic and improvement of charge storage stability in positively corona charged polytetrafluoroethylene film electrets have been studied.

研究了栅控恒压正电晕充电后的聚四氟乙烯薄膜驻极体的电荷输运特性，并对其电荷储存稳定性加以改善。

The thermo electrets of PMMA with surface potentials between about 50 and 〓 were fabricated.

采用热电极化的方法制得驻极电压在50～〓V正负电位的圆片状驻极体型聚合物聚甲基丙烯酸甲酯。

When they were UV radiated, the d33 of the porous PTFE electrets showed some decreases with the increasing of surrounding humidity.

3多孔PTFE驻极体的d33随紫外辐照时环境湿度的提高而有下降，环境湿度越大，d33的下降越多。

"The operators will suffer a temporary decrease in the number of consumers and short message services as people may not like having to provide their ID cards for a phone number," Xu Junqi, vice-dean with the Policy-Making Institute of the Telecommunications Research Centre under MII, said yesterday.

信息产业部下属的通信决策研究院副主任徐俊其昨天说：&实行手机实名制后，人们可能不太情愿用身份证注册手机号，所以通信运营商会暂时面临用户减少和短信用户减少的问题。&

I don't believe in make-believe!

我不相信这些虚构的故事。