最新刊期
期 12 ， 2016
- 摘要：9-(4-(naphthalen-1-yl) phenyl)-10-(naphthalen-2-yl) anthracene (NAPA-1) and 9-(naphthalen-2-yl)-10-(4-(naphthalen-2-yl) phenyl) anthracene (NAPA-2) are synthesized starting from 9-bromo-10-(naphthalen-2-yl) anthracene, 4-(naphthalene-1-yl) phenylboronic acid and 4-(naphthalen-2-yl) phenylboronic acid by Suzuki coupling reaction. Structures of the target compounds are characterized by IR, NMR. Results of TG and DSC analysis show the compounds have good thermal stability. The PL spectra of NAPA-1 and NAPA-2 in solution were found to exhibit excellent blue emission with the peak maxima at λmax=424 nm, 428 nm respectively.NAPA-1 and NAPA-2 have excellent light emitting performance and could be used as materials for organic light emitting diodes (OLEDs).关键词：organic electroluminescent;arylanthracene;Suzuki coupling;Blue light-emitting materials
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发布时间：2020-07-07 - 摘要：The influence of power, pressure and gas ratio on uniformity plasma etching a-Si was studied. The results show that the process of pressure in 10~15 Pa, power in 5 500~6 500 W is suitable for industrial production because a-Si etching uniformity is very stable. Etching rate and uniformity of a-Si is more sensitive to etching gas ratio. When SF6:HCl=800:2 800 mL/min, the etching uniformity of a-Si is the best. Gas exhausting from corners can maintain the plasma concentration obvious, which is conducive to enhance the uniformity of plasma etching. Gas exhausting from around will undermine plasma concentration and thus undermine the uniformity of a-Si etching.关键词：plasma etching;a-Si;uniformity;exhaust mode
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发布时间：2020-07-07 - 摘要：Due to the high cost of the TFT LCD materials, different types of parameters and the uncontrolled parameters in the frequent change. Companies will make huge loss if they can not manage all the factors well during the production. This paper proposes a real-time intelligent design method of parameter control by adding extra modules, so that manufacturing execution system (MES) can timely monitor the process parameters, analysis data and reduce human risk factors.Therefore, the stability of the production process will be improved with real-time control.关键词：TFT LCD;manufacturing execution system;process parameter;real-time control
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发布时间：2020-07-07 - 摘要：
The a-IGZO films were fabricated by solution method and high-pressure annealing process, and the effects of H2O2 on microstructural and optical properties of the a-IGZO films were studied by spectroscopic ellipsometry and atomic force microscope (AFM). Results indicated that when the annealing temperature was increased from 220℃ to 300℃, the optical band gap of the film was increased from 3.03 eV to 3.29 eV, the roughness was decreased from 20.69 nm to 4.68 nm.Compared to the film without H2O2, the refracti 关键词：a-IGZO film;H2O2 solution;spectroscopic ellipsometry;dense- 63
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发布时间：2020-07-07
Material and Device
- 摘要：The quality of collecting iris image is vital to whether recognizing iris image is right in iris recognition system. A new algorithm is proposed for the defocused and occluded iris images. Firstly the high frequency power of the right and left part of the pupil is calculated by Laplacian of Gaussian operator to discard the defocused images. Secondly, the average gray value of the upper region of the pupil is computed to discard the occluded images by eyelid. Finally, the occluded degree by eyelash is measured through the gradient information of the upper region of the pupil. The experimental results show that, the average processing speed of the algorithm is 0.020 9 s per frame, which fully meets the requirement of real-time iris recognition system, and also shows this algorithm is fast and efficient for iris image quality evaluation.关键词：iris image;quality evaluation;Laplacian of Gaussian;occlude of eyelids and eyelash
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发布时间：2020-07-07 - 摘要：To evaluate laser pointer's localization accuracy of moving objects, a laser spot measurement system is typically used to measure the spot of a 1.064 μm-wave-length laser on the target. However, the maximum measuring distance of existing laser spot measurement systems is only 500 m, which needs to be substantially increased. This essay analyzes the constraints of laser spot distance measurement, studies the methods for increasing the measuring distance of repetitive-frequency laser spot in field, designs a shutter optimal control strategy based on the use of a high-quantum-efficiency near-infrared camera which is able to precisely control the shutter exposure. A 99.9% laser spot admission rate is guaranteed, meanwhile the laser spot image SNR is increased about 8 times by controlling the camera exposure time. In field, the measuring distance of frequency-repetitive laser spot reaches 2 000 m, which meets the precision requirements for moving target measurement.关键词：repetitive-frequency laser;laser spot;imaging method;measuring distance
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发布时间：2020-07-07 - 摘要：In order to solve the problem of Mean-shift algorithm caused by the fixed track window, an improved Mean-shift algorithm using adaptive kernel function is proposed. Visual saliency weighted by the gray similarity is detected to ascertain the object area, and the adaptive kernel function is designed to track object combined with Epanechnikov and the object area, reducing the effect of fixed track window and background pixels. After plenty of experiments, the results show that the proposed method can track object scale motions in real time and exactly, and cost less than 25 ms for every frame.关键词：adaptive kernel function;Mean-shift;visual saliency
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发布时间：2020-07-07 - 摘要：
Jumper connecting plate is an important part of electricity supply network. Jumper connecting plate's status has a significant impact on electricity supply network's proper operation. However, all the existing algorithms identify the fault of electricity supply network with a unified approach, so we have no specific approach on various types of transmission equipment failure and it will result in low recognition rate of jumper connecting plate. In order to recognize the fault jumper connecting plate efficie 关键词：infrared image;jumper connection plate;morphology;intelligent recognition- 150
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发布时间：2020-07-07 - 摘要：Prior research has shown that the performance of face recognition systems in variant expression condition degrades seriously compared with invariant expression condition. Face recognition with variant expression is a challenging problem. In this paper, SIFT method is proposed to research on face recognition with variant expression. Two experiments using SIFT method are performed on a variant expression face database. In experiment 1, two images of one person with different expression are compared. In experiment 2, two images of different persons with the same expression are compared. Experimental results show that SIFT method could overcome the whole comparability of different faces and extract the local detail features of face. Recognizing the variant expression face images in Jaffe library, we get the right recognition rate of 95.59% when threshold equals 0.35, the experiment demonstrates the huge potential of SIFT method in application to face recognition with variant expression.关键词：face recognition;expression variant;SIFT method;local detail feature
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发布时间：2020-07-07 - 摘要：
Color image contains rich detail information, and can apperceive the world intuitively. It makes our work and life more convenient. However, due to the impact of bad environment, it will cause to obtain a degraded image, such as the captured image is usually be blurred, the target is submerged. The existing color image enhancement methods are mainly post-processing approaches.It is difficult to achieve the real-time requirement for identification and tracking in practical engineering applications. To solve 关键词：color image enhancement;RGB space;stretch transform;FPGA- 34
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发布时间：2020-07-07 - 摘要：This article sketches out the principle of human visual characteristics and color perception, then the color night vision technology is introduced, and the development of color night vision technology is briefly described. The significance of color night vision technology is analyzed. The existing color night vision technology is classified, and the typical color night vision technology and color night vision equipment are described in detail, the advantages and disadvantages of each category are analyzed. Finally, the difficulties and future trends of color night vision technology are discussed, which provide reference for the relevant researchers to understand the color night vision technology.关键词：color night vision;survey;color transfer;image fusion
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发布时间：2020-07-07
Display and Image
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