Mach—Zehnder干涉型光纤弱磁场传感器稳定性的研究

近年来,Mach—zehnder干涉型光纤弱磁场传感器的研究和应用获得了很大的发展,但是,外界环境因素的干扰始终影响着传感器的稳定性。本文选择直流相位跟踪法来保证传感器的稳定性,给出了理论阐述和具体电路。结果表明,该方法很好的消除了外界环境因素的干扰,保证了传感器的稳定性。     

基于赝电容的高线性度柔性压力传感器研究

基于可逆氧化还原反应的赝电容式柔性压力传感器具备高灵敏性能,可用于微弱压力检测,然而,目前赝电容式柔性压力传感器线性度较差,只能在有限压力区间内保持较高灵敏度。 为此,本文利用 MXene 材料作为电极,设计了一种内部具有孔隙且表面粗糙的双尺度随机微结构离子凝胶膜,增加了其压缩过程中的缓冲空间,使凝胶膜应力变形更加均匀,确保了灵敏度在受压过程中保持稳定。 实验数据表明,传感器在 0 ~ 1 MPa 范围内具有超高的线性度(相关系数 ~ 0. 994),优异的灵敏度( ~ 2 133. 7 kPa-1)、快速的响应和恢复时间(分别为~15 和~23 ms),较低的检测限( ~ 2. 5 Pa)和优异的机械稳定性。 将传感器用于水下,可高线性检测水深,同时传感器可以高灵敏检测到不同水深下螺旋桨扰动产生的微弱水流变化。     

Remote‐Loaded Platelet Vesicles for Disease‐Targeted Delivery of Therapeutics

The recent emergence of biomimetic nanotechnology has facilitated the development of next‐generation nanodelivery systems capable of enhanced biointerfacing. In particular, the direct use of natural cell membranes can enable multivalent targeting functionalities. Herein, this study reports on the remote loading of small molecule therapeutics into cholesterol‐enriched platelet membrane‐derived vesicles for disease‐targeted delivery. Using this approach, high loading yields for two model drugs, doxorubicin and vancomycin, are achieved. Leveraging the surface markers found on platelet membranes, the resultant nanoformulations demonstrate natural affinity toward both breast cancer cells and methicillin‐resistant Staphylococcus aureus. In vivo, this translates to improved disease targeting, increasing the potency of the encapsulated drug payloads compared with free drugs and the corresponding nontargeted nanoformulations. Overall, this work demonstrates that the remote loading of drugs into functional platelet membrane‐derived vesicles is a facile means of fabricating targeted nanoformulations, an approach that can be easily generalized to other cell types in the future.     

Applied Voltage and Near‐Infrared Light Enable Healing of Superhydrophobicity Loss Caused by Severe Scratches in Conductive Superhydrophobic Films

The fabrication of self‐healing/healable superhydrophobic films that can conveniently and repeatedly restore the loss of superhydrophobicity caused by severe mechanical damage, such as deep and wide surface scratches, remains challenging. In the present work, conductive superhydrophobic films that are healable by means of an applied voltage or near infrared (NIR) light irradiation are fabricated by depositing a layer of Ag nanoparticles and Ag nanowires (AgNPs‐AgNWs) on a thermally healable polycaprolactone (PCL)/poly(vinyl alcohol) (PVA) composite film, followed by the deposition of 1H,1H,2H,2H‐perfluorodecanethiol. The AgNPs‐AgNWs layer not only provides micro‐ and nanoscaled hierarchical structures in support of superhydrophobicity but also serves as an electrothermal or photothermal heater to enable healing of the underlying PCL/PVA film under the assistance of a low applied voltage or low‐power NIR light irradiation. Because of the strong adhesion between the PCL/PVA film and the AgNPs‐AgNWs layer, the healability of the PCL/PVA film is successfully conveyed to the conductive superhydrophobic layer, which can rapidly and repeatedly restore the loss of superhydrophobicity caused by cuts several hundreds of micrometers wide. The combined electrothermal and superhydrophobic properties endow the healable conductive superhydrophobic films with improved durability and usefulness as self‐cleaning, antiicing, and snow‐removing surfaces.     

生物无纺布反应器预处理黄河水的试验研究

利用自行研制的生物无纺布反应器对进入济南市鹊山水库一号泵站的黄河水进行了生物预处理试验研究。当水力负荷从2m3/(m2·h)增加到8m3/(m2·h)时,深入地探讨了生物无纺布对黄河水中的CODMn、NH4+-N、浊度、藻类、色度和SS的去除效果。试验结果表明,生物无纺布反应器能够有效地去除黄河水中的CODMn、NH4+-N等污染物质,是解决水源水微污染的有效预处理工艺。     

两端金属体对阵列感应测量数据的影响研究

两端金属体对阵列感应测量数据的影响对测井仪器设计和准确测量具有重要实际意义。在考虑线圈系和金属体有限大小及不同地层电导率情况下,通过数值计算详细分析了两端金属体长度和距离变化对阵列感应测井仪器的影响规律。地层电导率大于0.1S/m,金属体距离大于0.3m时,可以忽略金属体的影响,否则需要考虑金属体的影响。以地层电导率等于0.001S/m为例,分析金属体长度和距离变化对阵列感应测井仪器的影响规律。当间距小于1.3m时,子阵列6一侧的金属影响比子阵列8一侧的影响大。     

MIT5530阵列感应测井仪前置放大电路设计

根据微弱信号检测技术和电路低噪声设计基本原理,结合阵列感应仪器本身的接收信号强度微弱、干扰严重等特性,分析阵列感应测井仪器前置放大电路的低噪声单位增益缓冲级模块、第1级放大模块、第2级放大模块及温度补偿模块的设计重点和难点;对电路进行时域、频域和噪声特性仿真;对其温度性能进行实际测试,得出其主要的性能指标。分析前置放大电路容易出现的故障并提出解决措施。验证该前置放大器的可行性和实用性。     

基于泰克TDS684C数字示波器的新时间关联系统

利用泰克TDS684C数字示波器的触发时刻标记作为时间关联的时刻标记,建立一种不要时标注入电路也能够实现时间关联的新系统,这种新系统能够使多路辐射测量信号的时间关联更简单、方便、可靠,本文介绍这种基于泰克TDS684C数字示波器的新时间关联系统构成及应用实例.     

就近语音唤醒及识别关键技术研究与空调应用

目前语音空调产品大都共用同一个唤醒词唤醒设备,因此,当多台语音空调被同时唤醒时,会产生"一呼百应"的现象,为解决这一现象,提出就近语音唤醒关键技术研究及空调应用.通过前端语音自适应降噪算法解决室内环境噪声以及空调内部混响,其次通过局域网语音就近唤醒组网选举得到master节点(主节点)和slave节点(子节点),最后根...     

单相变压器在不同直流注入方式下的偏磁效应

利用时域场路耦合方法分析了不同直流注入方式对变压器交流励磁的影响,将变压器直流偏磁计算转换为场的耦合计算和路的耦合计算,用场模型计算动态电感,以路模型求解时域过程,通过计算耦合参数分析变压器电磁参数在直流扰动下的变化规律,对比了不同直流注入方式对变压器偏磁效应的影响。最后将仿真计算与实验结果对比,结果验证了理论分析的正确性。