The present invention provides a novel potassium-sodium niobate zirconium barium titanate series leadless piezoelectric ceramic composition which comprises perovskite type piezoelectrics KNaNbO3 and strong ferroelectrics Ba(TiZr)O3, the general formula is represented by (1-z)(KNa)NbO3-zBa(TiZr)O3, i.....
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The present invention discloses a phase lead compensation network, power converters, and closed-loop control system, the phase lead compensation network is provided in the power converter closed-loop control system, the closed loop control system further comprises: power converter and control module.....
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Mode photonic crystal fiber comprises a core of a substantially transparent material having a core. Said core material having a core refractive index and length, and having a core diameter. Surrounding said optical fiber further comprises a core material at the outer cladding region. The cladding re.....
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一种测试纺织品刚度的装置，包括一带有沿立柱延伸的刻度和在立柱顶部的支撑表面的立柱。在立柱上连接有构件。该构件带有沿与立柱垂直的方向延伸的刻度。构件可以沿立柱滑动和固定在立柱上。一重物放置在纺织品样品上以便将样品固定在适当位置。测试方法包括将纺织品样品放置在表面上并使纺织品样品的一部分延伸超过表面边缘。然后构件上升到支撑样品的位置，再下降到样品不再受到支撑的位置。从水平和垂直刻度读出读数用于计算。
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一种采用射频鉴别的计算和验证装置，包括信息记录部分以及计算和验证部分，其中信息记录部分包括：具有射频鉴别标记的记录体，在射频鉴别标记中存储了数据和信息；其中计算和验证部分包括：智能计算和验证箱体（１），传感器（２）和天线（３），同轴电缆（４），以及通过同轴电缆（４）与传感器（２）和天线（３）相连的外置或内置ＣＰＵ的射频鉴别读出器（５），传感器（２）用于辅助检测记录体是否工作正常，天线（３）用于检测记录体上的射频鉴别标记，读取记录的数据和信息，并将读取的数据和信息经同轴电缆（４）传送到外置或内置ＣＰＵ的射频鉴别读出器（５），射频鉴别读出器接收数据和信息，外置或内置ＣＰＵ则将接收的数据和信息解密和.....
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