视频图像处理技术在智能交通系统中的运用

交通对城市的发展有着重要影响,随着经济的快速发展,我国的城市交通的智能化得到了进一步提高,许多城市的交通都由传统的交通转变成了智能交通。近几年,智能交通系统中的视频图像处理成了人们探讨的热点话题。为了使智能交通更好的为城市服务。本文首先,对视频图像处理技术进行了介绍;其次,通过图形处理技术在电子警察系统中的应用进行了阐述;最后,对图像处理技术在智能交通系统的应用进行了详细分析,希望文章内容对相关工作人员能够有所帮助。     

Molecular Heterojunctions of Oligo(phenylene ethynylene)s with Linear to Cruciform Framework

Electrical transport properties of molecular junctions are fundamentally affected by the energy alignment between molecular frontier orbitals (highest occupied molecular orbital (HOMO) or lowest unoccupied molecular orbital (LUMO)) and Fermi level (or work function) of electrode metals. Dithiafulvene (DTF) is used as substituent group to the oligo(phenylene ethynylene) (OPE) molecular wires and different molecular structures based on OPE3 backbone (with linear to cruciform framework) are achieved, with viable molecular orbitals and HOMO–LUMO energy gaps. OPE3, OPE3–DTF, and OPE3–tetrathiafulvalene (TTF) can form good self‐assembled monolayers (SAMs) on Au substrates. Molecular heterojunctions based on these SAMs are investigated using conducting probe–atomic force microscopy with different tips (Ag, Au, and Pt) and Fermi levels. The calibrated conductance values follow the sequence OPE3–TTF > OPE3–DTF > OPE3 irrespective of the tip metal. Rectification properties (or diode behavior) are observed in case of the Ag tip for which the work function is furthest from the HOMO levels of the OPE3s. Quantum chemical calculations of the transmission qualitatively agree with the experimental data and reproduce the substituent effect of DTF. Zero‐bias conductance, and symmetric or asymmetric couplings to the electrodes are investigated. The results indicate that improved fidelity of molecular transport measurements may be achieved by systematic studies of homologues series of molecular wires applying several different metal electrodes.     

Modified Pechini Synthesis of Proton‐Conducting Ba(Ce,Ti)O3 and Comparative Studies of the Effects of Acceptors on its Structure,Stability, Sinterability,and Conductivity

The phase structure, chemical stability, sinterability, and electrical performance of the proton‐conducting Ba(Ce,Ti)O₃ solid solution with a series of acceptors M (M = In, Y, Sm) synthesized by a modified Pechini method were systematically investigated. The substitution of cerium with titanium was proved as an effective way to improve the stability of BaCeO₃. Especially for the BaCe_0.95Ti_0.05O_3?δ sample doped with In, no change in the phase was found even after treatment in the atmosphere containing both CO₂ and H₂O at 700°C for 10 h. Thanks to the highly sinteractive powders with particle size of ~100 nm, dense ceramics were easily acquired. Moreover, compared with the undoped BaCe_0.95Ti_0.05O₃ sample, In, Y, and Sm dopants further improved the sinterability of the solid solution. In particular, In played a role of sintering aid and led to the largest linear shrinkage of the ceramics. As to the electrical performance, the transport properties of the samples under various atmospheres were analyzed and compared. The impedance tests demonstrated the best electrical performance of the Y‐doped samples.     

基于MP3的汽车报站器

要介绍一种基于AT89C51SND1C单片机和闪存实现的MP3公交车报站器,可通过键盘和播放列表文件实现高品质语音信息的播放,同时使用LED点阵显示播放的内容。报站器可作为优盘方便地更换语音文件,便于车载广告信息的更换。     

BS7799风险评估的评估方法设计

介绍了BS7799国际标准的内容,对标准的组织结构进行了建模,并分析了BS7799标准的不足。在此基础上,提出了应用BS7799管理标准对组织进行信息安全管理风险评估的评估方法,即将层次分析法和失效树法相结合的综合评估方法,并给出了完整的计算过程。     

基于关联规则与遗传算法的蛋白质二级结构预测

文章通过建立蛋白质二级结构预测的数学模型,运用挖掘与遗传算法相结合的关联规则技术对蛋白质二级结构进行预测,设计并实现了该原型系统。实验表明,该文所采用的基于蛋白质氨基酸疏水性周期规律的预测模型方法较其它相关的二级结构预测方法有较好的准确性、有效性与可行性。     

核素153Sm体素S因子特性的研究

基于体素S因子计算个体化病例的三维剂量是目前核医学研究的一个重要方向.153Sm是目前骨转移治疗常用的核素之一.本文利用EGS4蒙特卡罗程序包构建了基于体素的三维吸收剂量分布模拟程序,计算了不同情况下153Sm的S因子,探讨了介质成分和物理密度对S因子的影响.结果表明:1)不同物理密度对S因子有明显影响;2)在相同物理密度的情况下,不同介质对S因子的影响相对较小.计算结果为基于体素S因子计算核素治疗的三维剂量提供了参考,明确了在不考虑介质和物理密度差异时S因子的误差.     

基于PSD的X射线光束位置探测器设计

位置灵敏探测器(Position sensitive device,PSD)是一种利用光电二极管表面电阻的光电子位置传感器,具有高速度、高分辨率、可靠性好等优点。本文描述了将PSD用于X射线条件性能测试的结果,给出了基于PSD的X射线光束位置探测器(X-ray beam position monitor,XBPM)的一个具体设计方案,并进行了相应估算,初步表明了其可行性。