首先，对PDF417条码的编码模式及编码原理进行了较详细的论述，简要介绍了条形码的错误检测和纠正方法；引入了对称DES加密技术与非对称RSA加密技术，对二维条形码进行信息加密的分析与设计，从而生成加密的二维条形码。 其次，对采集到的加密条形码图像进行图像预处理。由于采集的条形码图像，存在着图像倾斜和边缘模糊问题，

We present the generation of the nanosecond cylindrical vector beams (CVBs) in a two-mode fiber (TMF) and its applications of stimulated Raman scattering. The nanosecond (1064 nm, 10 ns, 10 Hz) CVBs have been directly produced with mode conversion efficiency of ～18 dB (98.4%) via an acoustically ind

A method of estimating the relative clocks between two spaceborne global positioning.system (GPS) receivers based on the single-difference (SD) observations is investigated in.this paper. Especially, the advantages of introducing a double-difference (DD) solution.constraint, including the orbits and ambiguities, are discussed with the simulated data.and the real data of Gravity Recovery And Climate Experiment (GRACE) satellites. The.theoretical accuracy analysis shows that the accuracy of the re

Estimating ellipticity of a fiber core using two types of interferometry

This paper proposes TW-k-means, an automated two-level variable weighting clustering algorithm for multiview data, which can simultaneously compute weights for views and individual variables. In this algorithm, a view weight is assigned to each view to identify the compactness of the view and a variable weight is also assigned to each variable in the view to identify the importance of the variable. Both view weights and variable weights are used in the distance function to determine the clusters

Adaptive beam shaping for improving the power coupling of a two-Cassegrain-telescope

We report on a novel dibenzothiophene-based two-photon fluorescent probe for selective nuclear bioimaging, which contains bilaterally symmetrical pyridine rings connected by a central conjugated-bridge dibenzothiophene. This probe possesses a large two-photon absorption cross-section of 471 GM, yields a 25-fold enhancement of the fluorescence titration, and a stronger photostability for nuclei labeling than existing probes. The real-time observation period is a minimum of 1800 s under a femtosec

Modifying the surface of poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) with toluene during the high-speed spin-coating process of dimethylformamide considerably improves the wettability and morphology of PTAA and results in improvement of the crystallinity and absorption of perovskite film. The hole mobility and ohm contact have also been improved accordingly. Combined with these improved parameters, inverted perovskite solar cells with high efficiency of 19.13% and long-term stability

双向链表C语言实现 有些接口函数两种方式实现

Radiowave propagation loss prevision using one of the two COST231 models.zip