Self‐Powered Trajectory,Velocity, and Acceleration Tracking of a Moving Object/Body using a Triboelectric Sensor

Motion tracking is of great importance in a wide range of fields such as automation, robotics, security, sports and entertainment. Here, a self‐powered, single‐electrode‐based triboelectric sensor (TES) is reported to accurately detect the movement of a moving object/body in two dimensions. Based on the coupling of triboelectric effect and electrostatic induction, the movement of an object on the top surface of a polytetrafluoroethylene (PTFE) layer induces changes in the electrical potential of the patterned aluminum electrodes underneath. From the measurements of the output performance (open‐circuit voltage and short‐circuit current), the motion information about the object, such as trajectory, velocity, and acceleration is derived in conformity with the preset values. Moreover, the TES can detect motions of more than one objects moving at the same time. In addition, applications of the TES are demonstrated by using LED illuminations as real‐time indicators to visualize the movement of a sliding object and the walking steps of a person.     

BSIM4和ULTRA-BULK模型对称性和连续性的检验

本文以对比的形式用GUMMEL对称测试电路的模拟结果检验了伯克利大学的BSIM4和北京大学的ULTRA-BULK两个CMOS器件模型的对称性和连续性特性。SPICE模拟结果表明: 工业标准模型BSIM4在电荷,电流高阶导数以及电容等的连续性和对称性上具有一系列的缺陷,而最新发展的基于表面势的MOSFET解析模型ULTRA-Bulk却表现出必需的连续性和对称性. 既然这些属性对于模拟电路和射频电路设计都是非常重要的, 那么新一代CMOS模型采用基于表面势的各种MOSFET解析模型将是必然的发展.     

用能量守恒定律消除高压变频室内负压

高压变频设备在我厂投运以来节能效果显著,但由于变频设备采用的室内外空气交换散热方式而产生的负压等一系列问题,不仅严重影响着生产的安全稳定运行,也危及着人身安全。我公司技术人员通过自主创新,采用能量守恒定律对变频设备的散热方式进行了改变,无需投资,见效快,投运一年来收到了良好的运行效果。     

大视场星敏感器光学系统畸变校正方法

针对大视场星敏感器光学系统畸变较大,严重影响角距测量精度的问题,采用多项式拟合算法,对研制的星敏感器进行了畸变校正,校正后的平均角度测量误差小于1″。     

AND:Rubrene发光层的有机电致白光器件

利用9,10-bis(2-naphthyl) anthracene(AND)掺杂rubrene作为器件单一发光层,研制成功单层白光器件。器件在电流密度为140mA/cm2时,电流效率达到5.93cd/A;当电压为21V时,该器件达到最高亮度9300cd/m2。器件发光色坐标为(0.32,0.40),且随着电压的变化发光色度始终处于白光区。这种器件的白色发射是来源于AND(蓝色发射)和rubrene(橙色发散)的混合发射。与此同时,AND和rubrene二者之间会发生Frster能量传递。     

基于窄脉冲反射仪的高速数据采集系统的设计

简单介绍了窄脉冲反射仪测试电缆故障的基本原理,分析了其脉冲的特点和处理要求,设计了单路低速多次数据采集系统,给出了系统原理框图,并对其逻辑控制部分做了详细阐述。通过仿真分析,证明该系统方案切实可行,可有效解决电缆故障测距过程中的高精度数据采集问题。     

A Robust, Digital-Audio Watermarking Method

Most of the previous audio-watermarking schemes are robust to common signal-processing attacks, but show severe problems when faced with desynchronization attacks. To solve the problems associated with these approaches, we propose an audio-watermarking scheme based on support-vector-machine (SVM) theory to protect against desynchronization attacks by using audio statistics characteristics and a synchronization code technique. Experimental results with SVM show that our proposed scheme is inaudible, robust against common signal processing, and robust against desynchronization attacks.     

GaAs基GaSb体材料及InAs/GaSb超晶格材料的MBE生长

采用分子束外延方法在GaAs(100)衬底上生长GaSb体材料,以此GaSb为缓冲层生长了不同InAs厚度的InAs/GaSb超晶格,其10K光致发光谱峰值波长在2.0～2.6 μm.高分辨透射电子显微镜观察证实超晶格界面清晰,周期完整.     

Mechanochromic Photonic Vitrimer Thermal Management Device Based on Dynamic Covalent Bond

Flexible self-healing thermal management devices are increasingly in demand due to their high flexibility, low driving voltage, and excellent stability of thermal property. In this paper, the design of mechanochromic self-healing thermal management devices is reported based on photonic vitrimer through self-healing dynamic covalent bond. A series of new photonic vitrimers i first prepared by dynamic disulfide covalent bond and PS@SiO₂ photonic crystals. The resulting photonic vitrimer exhibits bright structural colors, large tensile strain (>1000%), high mechanical strength (>10 MPa) and self-healing ability (>95% efficiency). More importantly, the structural color remains constant after 10000 stretching/releasing cycles, demonstrating excellent mechanical stability, creep-resistance, and durability. Taking advantage of the above features, a novel mechanochromic flexible wireless thermal management (MFW) device is developed by semi-embedding the photonic vitrimer in a thermally conductive carbon nanotube film and then integrating it with a Bluetooth module and a control chip. Interestingly, the MFW device exhibits mechanochromic property, fast thermal response, low driving voltage (103 °C, at 3 V), and precise temperature control. Notably, the device even remains electrothermal performance (105 °C) after self-healing. This work provides new insight into the self-healing photonic materials, and the device shows promising applications in wearable electronics, vitro physiotherapy, and personal heating.     

分布式系统任务调度的实现及算法与发展

分布式系统中的任务调度一直是一个十分活跃的课题 ,本文对任务调度作了总体的介绍 ,对经典算法的优劣进行了评价 ,并对近年提出的新算法予以介绍 ,最后 ,总结了任务调度算法的发展方向。