Bi系高温超导带材冷压工艺优化试验

采用套管法（ＰＥＴ）制备Ｂｉ系高温超导带材,进行了冷压工艺的优化研究。试验结果表明,Ｂｉ系带材所能承受的压力有一个限值,若超过这个限值后,密度虽可提高,但晶粒破碎严重Ｊｃ值反而降低,带材优化的冷压工艺参数是８３８℃／６０ｈ＋冷压＋８３８℃／６０ｈ。第１次压力为２ＧＰａ,第２次２．５ＧＰａ;冷压压下速率为１．５×１０＾－４ｍｍ／ｓ。同时研究还表明冷压的主要作用是提高带材的致密度和晶粒取向度,最终改善     

无损耗电阻器的设计方法

利用超导线圈的纯电感器可以模拟成无损耗电阻器，这种新型器件在性能上与电阻器相似，但不产生功率损耗。本文提出了一种用双线性变换法设计无损耗电阻器的方法，并对无损耗电阻器的实现与控制进行了论述。     

激光扫描淀积原位生长高TC超导薄膜

用激光束扫描淀积的方法，成功地在ＺｒＯ２（Ｙ），ＬａＡｌＯ３基片原位生长高质量的ＹＢａ２Ｃｕ３Ｏ７－ｘ高温超导薄膜，其临界温度达到９０Ｋ以上，ＳＥＭ及ＸＲＤ分析表明，薄膜沿Ｃ轴择优外延生长，其结晶性很好，表现光滑均匀。     

高温超导滤波器研制

设计并制作了中心频率为2 007.5MH z,带宽为15MH z的6阶T l2B a2C aCu2O8高温超导微带滤波器.采用在谐振器之间插入微带条来微调耦合间距的办法,提高了设计的精确度.实测结果表明滤波器的最小插入损耗为0.25 dB,带外抑制约60 dB,带内波纹为0.16 dB,中心频率、带宽以及边带陡峭度等都与仿真结果吻合较好,验证了设计与制作的一致性.     

Fabrication of MgB2 superconducting films by different methods

MgB₂ superconducting films have been successfully fabricated on single crystal MgO(111) and c-AL₂O₃ substrates by different methods. The film deposited by pulsed laser deposition is c-axis oriented with zero resistance transition temperature of 38.4 K, while the other two films fabricated by chemical vapor deposition and electrophoresis are c-axis textured with the zero resistance transition temperature of 38 K and 39 K, respectively. Magnetization hysteresis measurements yield critical current density J_c of 10⁷ A/cm² at 15 K in zero field for the thin film and of 10⁵ A/cm² for the thick film. For the thin film deposited by chemical vapor deposition, the microwave surface resistance at 10 K is found to be as low as 100 μΩ, which is comparable with that of a high-quality high-temperature superconducting thin film of YBCO.     

MEMS--电子领域的新宠

微机电系统技术(MEMS)是随着半导体集成电路微细加工技术和超精密机械加工技术的发展而发展起来的．其微型化、集成化、批量生产和多学科交叉等优良特性将对人类社会生活带来巨大的进步，是电子领域的新宠。     

Detection of the translational oscillations of the Earth''''s solid inner core based on the international superconducting gravimeter observations

Before about 100 years, the layered structures of the Earths body and the existence of the liquid core had been found, then the solid inner core and detailed structures in the interior of the Earth are demonstrated, it proves that the satisfied achievements had been obtained in recogni-tion of the Earths interior structures. In recent years, with the increasing requirements of the basic sciences and space techniques to geodynamics of the Earths interior, the theoretical study and practical de…     

无线可穿戴身体姿态监测系统的研究与实现

为预防由于坐姿不正确而引发的身体疾病, 设计一种无线可穿戴人体身体姿态监测系统。TI CC2540处理器处理由LIS3DH 传感器实时采集人体坐标x 轴、y 轴、z 轴加速度数据, 并通过蓝牙4. 0 协议将其传输到手机客户端APP(Application)上进行数据的处理并显示, 以达到矫正人体姿势的目的。同时该系统又可实现与体感游戏的有机结合, 达到锻炼身体的目的。     

Recent advances of flexible sensors for biomedical applications

Ultrathin, soft, flexible and stretchable sensors offer good opportunity to design personal health diagnosis and treatment systems by fabricating wearable biomedical devices for continuous health monitoring and preventive medicine. This paper summarizes the recent advances of flexible sensors for next generation biomedical applications. Materials used for flexible sensors are first briefly introduced. Followed to this part, the latest developments of flexible sensors for biomedical applications ...