用开口波导反射法测量材料电磁特性的新技术

本文提出用开口波导反射法同时测量高损耗材料电磁参数εｒ,μｒ的新技术。用开口波导作传感器,测量样品加载时的复反射系数,并与以εｒ,εｒ为变量的理论计算值相比较,运用优化技术求得待测材料的电磁参数。     

激光对望远系统损伤的研究

本文对激光光束通过望远系统后光束的变化进行了分析，并对６倍望远镜进行了激光损伤和破坏的实验研究，实验结果表明，激光对望远系统的损伤破坏主要是热效应所致，损伤破坏的情况与激光的能量，波长，脉冲宽度和望远系统的结构有关。     

蛋白质与原卟啉Ⅸ及复合物发光机理探讨

对原卟啉Ⅸ（ＰｒｏｔｏｐｏｒｐｈｙｒｉｎⅨ）与蛋白质结合物的吸收、荧光的激发、发射光谱等的研究，表明了在光作用下，其可见区发光（λｍａｘ６３５ｎｍ左右）与卟啉有关，而紫外区发光（λｍａｘ４２２ｎｍ左右）与蛋白质的色氨酸残基有关，其光谱特性与临床诊断选择的癌固有荧光特征峰基本相符。该研究结果为探讨癌的发光机理积累了有益资料．     

The Research on 220GHz Multicarrier High-Speed Communication System

This paper presents our investigation into a 220 GHz multicarrier highspeed communication system based on solid state transceivers.The proposed system has eased the demand of high sampling rate analog-to-digital converter(ADC)by providing several signal carriers in microwave band and converting them to 220 GHz channel.The system consists of a set of 220 GHz solid-state transceiver with 2 signal carriers,two basebands for 4 GSPS ADCs.It has achieved 12.8 Gbps rate real-time signal transmission using 16QAM modulation over a distance of 20 m without any other auxiliary equipment or test instruments.The baseband algorithm overcomes the problem of frequency difference generates by non-coherent structure,which guarantees the feasibility of long-distance transmission application.Most importantly,the proposed system has already carried out multi-channel 8K video parallel transmission through switch equipment,which shows the multicarrier high-speed communication system in submillimeter wave has great application prospects.To the best of the authors’knowledge,this is the first all-solid-state electronics multicarrier communication system in submillimeter and terahertz band.     

High-power Mode Converter of Overmoded Bent Circular Waveguide

Based on the mode coupling theory, a TE₀₁—TM₁₁ mode converter was designed and optimal results were obtained. In this paper, bandwidth of mode converter with axis exponential structure is the largest, and mode converter with axis sinusoidal structure is the most compact in the case of the center frequency is 28GHz and the waveguide radius is 16mm. If the bending angle between input port and output port of mode converter was demanded for 90°, mode converter with axis parabola structure had the characteristics of compact structure, higher mode purity and larger relative bandwidth. Meanwhile, we found that the converter could be also used as TE₁₁ mode transition with transmission efficiency above 99%. But due to bending angle of this structure was restricted, its center frequency and waveguide radius had the obvious corresponding relation.     

Scaling and technological limitations of 1/f noise and oscillator phase noise in SiGe HBTs

This paper examines the impact of SiGe HBT scaling on 1/f noise and phase noise of oscillators and frequency synthesizers. The increase of transistor speed with scaling is shown to significantly increase the sensitivity of oscillation frequency to 1/f noise and, thus, degrade close-in phase noise, but decrease the sensitivity of oscillation frequency to base current shot noise and base resistance thermal noises. The results show that corner offset frequency defined by the intersect of the 1/f³ and 1/f² phase noise has little to do with the traditional 1/f corner frequency. The relative importance of individual noise sources in determining phase noise is examined as a function of technology scaling, device sizing, and oscillation frequency. The collector current shot noise and base resistance noise are shown to set the fundamental limits of phase noise reduction. A methodology to identify the maximum tolerable 1/f K factor is established and demonstrated for the HBTs used     

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.     

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。