镀铬层表面等离子束流加热区视觉信息检测试验

论述了视觉传感技术的特点和研究现状。针对镀铬层固态表面传热及光路特点，选取了普通CCD摄像机，利用固态表面对电弧的反射光和加热工件自身的辐射光，在近红外波段取像的视觉采集方法。结合近红外光谱特点和CCD摄像机的光谱响应度变化趋势，在980nm波长的窗口区域提取到了清晰的视觉图像。分析了镀铬层固态表面等离子束流加热区图像的成像机理，在对加热区图像特征进行分析的基础上对图像进行了处理，提取出了有效信息。     

a-C:F:H films prepared by PECVD

Fluorinated amorphous hydrogenated a-C:F:H carbon thin films were deposited using radio frequency plasma enhanced chemical vapor deposition(RF-PECVD) reactor with CF4 and CH4 as source gases and were annealed in a N2 atmosphere. The properties of these films were evaluated by FTIR spectrometry, UV-VIS spectrophotometry and single-wavelength spectroscopic ellipsometry. A correspondence relativity connection between the deposition rate and technology was found. The chemical bonding structures and the content of CHx and CFx in the films are transformed and the optical band gap decreases monotonically with increasing temperature after annealing.The dielectric constant is increased with decreasing content of F in the films and the optical band gap is decreased with decreasing the content of H in the film.     

高频群脉冲电解加工控制系统研究

介绍了高频群脉冲电解加工的控制系统，其核心部件由PMAC运动控制器和PCL-818HD多功能数据采集板构成，主要功能包括控制工具阴极进给、极间加工间隙及短路保护等。实验表明，该控制系统能保证加工的高精度、稳定性及可靠性。     

Investigation of micro-EDM material removal characteristics using single RC-pulse discharges

Similar to EDM, in micro-EDM, intense heat is generated between the workpiece and tool electrode by the discharge through a dielectric medium to result in the formation of a microcrater that is much smaller in size. In this study, a single-spark generator has been developed to study the erosion characteristics from the microcrater size. Using a simple heat transfer model, the efficiency at different discharge condition is also deduced. It is found that at lower-energy (<50 μJ) discharges, the energy required to remove the unit volume of material, defined as the specific energy, is found to be much less than that at higher-energy discharges. Additionally, the ratio of the standard deviation to the measured microcrater size is found to be lower at lower discharge energy, indicating greater consistency in shape and size when the discharge occurs at lower energy. The fundamental erosion mechanism of material is discussed by considering melting and evaporation phenomena using theoretical modeling. The average efficiency of erosion, when estimated to be due primarily to melting or evaporation alone, is found to be up to an order of magnitude higher at lower-energy discharges than that at higher-energy discharges.     

纳米压痕形变过程的分子动力学模拟

根据EAM多体势，利用分子动力学方法模拟了Ni压头压入Al基体的纳米压痕全过程．包括压头接近和离开基体时的原子组态；压入和上升时的载荷一位移曲线以及位错的发射和形变带的产生和变化；同时模拟了纳米尺度的应力弛豫行为．结果表明，当压头尚未接触基体时就能吸引基体原子，通过缩颈而互相连接．当压入应力Ts为1．9MPa时，基体Al开始发射位错；当分切应力Td=6．4MPa时，出现形变带．压头上升过程出现反向的拉应力，使基体反向屈服，在卸载过程中基体残留位错的组态不断改变．当压头上升离开基体后能拉着基体通过缩颈而相连，当压头和基体分离后仍粘有基体原子．在纳米尺度也存在应力弛豫现象，其原因是热激活引起的位错发射和运动．     

基于GAP技术的地震信息网络系统改造方案

江苏省地震信息网络系统是全省区域地震数据传输、数据交换、数据存储及信息服务的统一平台。针对网络系统目前存在的问题,提出了改造方案,即通过使用隔离网闸将业务传输系统和互连网进行物理隔离,升级网络关键设备和链路带宽,增加网络安全设备等技术手段,使网络系统达到了安全、稳定运行的目标,既满足了地震信息数据传输、交换、存储及多元化应用等的需求,又符合信息系统三级安全管理要求,可以为地震行业信息网络系统优化建设提供有益参考。     

Single display gamut size metric

To measure the relative gamut sizes of wide‐gamut displays, it is herein proposed that the CIE 1931 xy chromaticity diagram be used rather than the nominally perceptually uniform CIE 1976 u′v′ chromaticity diagram. High correlations were found between the area‐coverage ratios in the xy diagram and the volume‐coverage ratios in the CIE 1976 L^*a^*b^* color space for major standard wide‐gamut color spaces. It is also demonstrated herein that performing planimetry in the uniform u′v′ diagram does not yield accurate relative display gamut sizes, even though the large sizes obtained using the u′v′ diagram are often reported regardless of the fact that its uniformity is valid only when the luminance factor is constant. The single display gamut size metric using the xy diagram will facilitate the unbiased development of wide‐gamut displays.     

Design considerations for highly efficient edge‐lit quantum dot displays

Quantum dots (QDs) are increasingly the technology of choice for wide color gamut displays. Two popular options to incorporate QDs into displays include on‐edge and on‐surface solutions. The opto‐mechanical design for an on‐edge QD solution including a LED light bar (“on‐edge QD light bar”) is more complex than the design for a standard white phosphor LED light bar. In this paper, we identify and investigate a range of design parameters for an on‐edge QD light bar, and we show that these parameters have significant influence on system efficiency and color uniformity. The effects of varying these parameters are explored through the use of a custom adjustable testbed and optical raytracing methods. Our testbed data demonstrate the inherent trade‐offs between efficiency and color uniformity and provide guidance for the design of high‐performing displays. The optical raytracing data demonstrate a good predictive capability and support the use of optical modeling methods for a detailed exploration of a wider range of design parameters.     

Independently controllable dual‐band microstrip bandpass filter using quadruple‐mode stub‐loaded resonator

In this article, a quadruple‐mode stub‐loaded resonator (QM‐SLR) is introduced and its four modes are excited using a simple approach, which can provide a dual‐band behavior. By changing the length of the loaded stubs, independently tunable transmission characteristics of the proposed quadruple‐mode stub‐loaded resonator were extensively described for filter design. Moreover, microwave varactors were adopted to represent the length variation of the loaded stubs for the dual‐band tunability. The equivalent circuit modeling of the open stub with microwave varactor was given and discussed. Then, adopting the compact quadruple‐mode stub‐loaded resonator with three varactors, an independently controllable dual‐band bandpass filter (BPF) was designed, analyzed, and fabricated. Its separated bandwidths and transmission zeros can be tuned independently by changing the applying voltage of the microwave varactors. A good agreement between simulated and measured results verified the design methodology. The proposed filter possesses compact size, simple structure, and excellent dual‐band performances. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:602–608, 2016.