最新刊期
期 9 ， 2016
- 摘要：Polymer-stabilized blue-phase liquid crystal display based on Kerr effect is designed to realize the narrow viewing angle mode for information protection in public. Through using several uniaxial films, the polymer-stabilized blue-phase liquid crystal display can exhibit a good narrow viewing angle, whose contrast ratio over 10:1 is only within 20 viewing cone as expected. Moreover, the operating voltage of the proposed device has been reduced to 14 V, which can be driven by the mainstream a-Si TFTs and achieved the peak transmittance 71%, which can make the LCD more efficient in availability ratio of the backlight. Compared with the conventional narrow viewing angle mode, the proposed device does not have complex electrode structure or a number of compensation films, which can satisfy the standard to produce in industry. The narrow viewing angle of the LCD will play more and more important part in avoiding the leakage of personal information in the information age.关键词：polymer-stabilized blue phase liquid crystal;narrow viewing angle;information protection;low operating voltage
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发布时间：2020-07-07 - 摘要：Based on the Landau-de Gennes theory, with the relaxation iterative method, we investigated the electric field-induced structure transition in a nanoconfined HAN cell with -1/2 topological defect, where the electric field is parallel to the disclination line. Our results show that with fixed cell gaps, five new structure transition processes are induced by electric field; while cell gap variation leads to three transition modes for an applied electric field. The critical value of cell gap corresponding to the structure transition is characterized by the local minimum in the force curve.关键词：order reconstruction;Landau-de Gennes theory;-1/2 defect;force curve
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发布时间：2020-07-07 - 摘要：
In order to improve the view angle,the haze of clear state and the bistable property of smart window by polymer dispersed liquid crystal(PDLC), we have synthesized an organosiloxane smectic liquid crystal with long carbon chain and prepared simple optical bistable device by using this material. This oganosiloxane smectic liquid crystal was synthesized from 10-bormodec-1-ene,4'-hydroxybiphenyl-4-carbonitrile and 1,1,1,3,3,5,5-heptamethyltrisiloxane in high yield. The molecular structure was confirmed by nucl 关键词：organosiloxane;smectic phase;optical bistable device;smart window- 29
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发布时间：2020-07-07 - 摘要：Bent-core nematic (BCN) liquid crystal under a certain low frequency voltage and temperature will produce flexodomain, a spatially periodic array of bright and dark stripes. Through polarizing microscope (BX-51) and charge coupled device (CCD), the change of periodic flexodomain under different applied voltages and temperatures were explored. The periodic structure was verified by using the optical diffraction technology, too. The results show that flexodomain first appears when the applied voltage is 25 V and the temperature is 95℃, and the period of flexodomain decreases with the increase of applied voltage as the temperature is a certain value. In addition, when the voltage is a certain value, the contrast of periodic structure will become blurry with the increase of temperature and the blurry stripes become clear again only when the applied voltage increased. This research has a certain guiding significance on the application and development of BCN liquid crystal in liquid crystal grating.关键词：BCN liquid crystal;flexodomain;threshold voltage;liquid crystal grating
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发布时间：2020-07-07 - 摘要：A layer of thick metal titanium is plated on the flat ceramic substrate by the method of magnetron sputtering. After processing, the surface defect of metal titanium layer put in the cavity of microwave plasma chemical vapor deposition. Using the method of orthogonal experiment, the thin film of best emission is prepared. By scanning electron microscopy, X-ray diffraction instrument, Raman spectroscopy instrument, the thin film is analyzed. The conclusion of the film is globular micron diamond film. And the film mechanism of field emission is studied.关键词：globularmicron diamond films;field emission;chemical vapor deposition
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发布时间：2020-07-07
Material and Devic
- 摘要：This paper proposes a novel wood surface defect detection scheme based on image fusion to solve the detection of wood surface knots stained by colorants. This scheme picks up the infrared and visible images of the stained wood veneer. The weighted average scheme, PCA scheme, wavelet transform scheme and Laplacian pyramid scheme are used to fuse the original images. The fused images with different fusion schemes are compared and investigated carefully. Experiments indicate that fused images can identify the stained knots clearly, and the best outcomes are achieved by the Laplacian pyramid scheme.关键词：image fusion;defect detection;infrared image;visible image
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发布时间：2020-07-07 - 摘要：In order to solve the problem of bullet marks image depth feature information loss in traditional algorithm, we propose a three-dimensional bullet point cloud image feature extraction algorithm. The feature points are extracted from the local extremal points according to the change of ridge's slope. And the linear fitting method is utilized to construct the triangle in order to calculate the characteristic parameters and define the similar range of the characteristic parameters. Finally, the unknown bullet is discriminated through the similar range to ensure the consistency between the bullet and the gun. The experimental results show that correct recognition rate of bullet comparison reaches more than 90% under the condition of existing sample, and data processing of a single set of bullet data spends 32.7 s. The proposed algorithm satisfies the bullet comparison demand, provides credible basis for the following bullet comparison and has certain theory value and practical significance.关键词：bullet marks;depth feature information;point cloud;slope;similar range
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发布时间：2020-07-07 - 摘要：
Due to the strong reflection property of materials with smooth surfaces like ceramic and metal, it will cause saturation and the highlight phenomenon in the image when taking pictures of those materials. Focused on that problem and taking advantage of the diffusion effect of the diffuser, we design a highlight suppression system based on the linear diffuser. Primarily, we theoretically analyze the diffusing principle of the linear diffuser. Besides, we also analyze the highlight suppressing effect of the di 关键词：3D vision inspection;highlight suppression;structured light;linear diffuser- 27
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发布时间：2020-07-07 - 摘要：
Aircraft attitude measurement is an important phase in the target location of UAV (Unmanned Aerial Vehicle, UAV) system. This paper intends to achieve attitude information by using multi-BDS (BeiDou navigation positioning system, BDS) receiver antenna. Furthermore, the influence of the attitude measurement accuracy on the positioning precision of airborne optoelectronics platform is analyzed. To solve these problems, a target location system model of airborne optoelectronics platform is established. After a 关键词：BDS receivers;Monte Carlo method;accuracy of the attitude determination;error of target localization- 44
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发布时间：2020-07-07 - 摘要：
In order to detect saliency goals more accurately, saliency detection method for single domain is easy to cause the disadvantage of useful information loss. So a model is proposed by combining global information of the frequency and local information of the spatial to obtain more comprehensive saliency target information. The model is necessary. Through fusing the useful information of two domains, the final saliency detection combines the detail of the local information with the integrity of the global inf 关键词：computer vision;saliency detection;joint spatial-frequency;local;global;fusion- 33
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发布时间：2020-07-07 - 摘要：
A new object tracking algorithm has been proposed which is based on the corner reinforced for the problem of the feature points can't represent the target effectively in the TLD. The Shi-Tomas corner point has been added into the existing tracking points as the feature points, which is insensitive to the light change and invariant to rotation. When tracker is running, the target will be located by the reserved corner which is tracked by the optical flow and filtered by the error detector. The experiments sh 关键词：object tracking;TLD;corner feature;online model- 126
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发布时间：2020-07-07
Display and Image
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