光纤陀螺温变效应误差抑制方法研究

在干涉式光纤陀螺组成的捷联惯性导航系统中,光纤陀螺启动过程中温变效应导致的漂移项是导航误差的主要误差源,已成为限制高精度光纤陀螺系统性能进一步提升的关键因素。通过对光纤陀螺启动过程中温变效应的理论分析与建模,提出了一种基于查表补偿的光纤陀螺启动温变效应误差抑制法和误差评价法。实验结果表明,该抑制方法可使-40~+60 ℃环境下光纤陀螺漂移概率误差从0.02～0.50 (°)/h降至0.01 (°)/h以下,对应导航系统的导航圆概率误差从1.4~35 n mile/h降至0.8 n mile/h以下,有效抑制了光纤陀螺启动温变效应误差,提升了系统性能。     

生态足迹分析法在乡镇发展评估中的应用

用生态足迹分析法对江都市武坚镇2003年和2007年生态足迹进行了计算评估,并将农业污染计入总生态占用中．评估结果反映出该镇的发展处于可持续发展状态,但2003年情况要好于2007年．同时采用线性规划方法对该镇生态足迹进行优化,对评估结果作了进一步探讨．     

龙门机械手PLC控制系统面向对象编程方法研究

为了提升PLC的程序设计水平,针对龙门机械手的控制过程,把面向对象编程思想引入PLC程序设计领域,通过面向对象分析,建立了龙门机械手面向对象模型,并基于面向对象思想设计了PLC控制程序。通过系统应用证实该方法所编制PLC程序具有重用性、灵活性和可扩展性。     

Glycopeptide-Based Multifunctional Hydrogels Promote Diabetic Wound Healing through pH Regulation of Microenvironment

Excessive inflammation, bacterial infection, and blocked angiogenesis make diabetic wound healing challenging. Multifunctional wound dressings have several advantages in diabetic wound healing. In addition, the pH regulation of the microenvironment is shown to be a key factor that promotes skin regeneration through cellular immune regulation. However, few reports have focused on the development of functional dressings with the ability to regulate the pH microenvironment and promote diabetic wound healing. This study presents a novel approach for regulating the pH microenvironment of diabetic wound sites using a glycopeptide-based hydrogel consisting of modified hyaluronic acid and poly(6-aminocaproic acid). This hydrogel forms a network through Schiff base interactions and metal complexation, which suppresses inflammation and accelerates angiogenesis during wound healing. Hydrogels not only have adequate mechanical properties and self-healing ability but can also support tissue adhesion. They can also promote the secretion of inducible cAMP early repressor, which promotes the polarization of macrophages toward the M2 type. The in vivo results confirm that hydrogel promotes diabetic wound repair and skin regeneration by exerting rapid anti-inflammatory effects and promoting angiogenesis. Therefore, this hydrogel system represents an effective strategy for treating diabetic wounds.     

基于门限的组密钥管理方案

在动态门限密码共享方案的基础上,将Shamir门限密码体制应用到组播加密过程中,提出一种基于门限的组密钥管理方案GKMT。当有组播用户加入或退出组播组时,无需重新分发组密钥,从而提高方案执行效率。引入分层控制的思想,对GKMT方案进行改进,得到LGKMT方案。性能分析结果表明,GKMT和LGKMT方案在通信开销方面优于现有组密钥管理方案,适用于组成员状态经常发生变化的组通信网络。     

基于形状特征及边缘候选区域的车辆检索技术

为了快速定位监控场景中不同姿态的车辆位置,结合车辆外形特征、目标候选区域和级联Boosting分类器进行多角度车辆检测。对不同角度和纵横比的车辆进行聚类,然后对每种姿态的车辆提取候选区域的累积通道特征（ACF）,使用AdaBoost学习分类器用于车辆检测,此外,检测时用边缘框计算可能存在物体的区域代替滑动窗法进行提速。以含有较难、中等、较易3种难度水平超过3?500个样本为测试集进行了快速车辆检测测试,并与ACF、DPM、NPD和HOG-Haar等4种方法进行了对比,实验结果表明基于候选区域的车辆检测方法性能最优,在3种测试集上平均达到了85%以上的检测率。     

Construction technology on pile foundation of No. 6 main pier in Dashengguan Yangtze Bridge

Based on pile foundation construction of No. 6 main pier, deep mudstone geological foundation and deep-water construction in Nanjing-Dashengguan Yangtze Bridge, the method of super-large-diameter bored pile in deep water is studied. The spread drill, application of PHP mud, and choice of machine are solved by adopting two machines of KTY4000 and KPG300A. Besides, the airlift reversing circulation is selected in slag discharge. The results show that this method can ensure successfully the construction of pier foundation to satisfy the demands of codes.     

On the fatigue and fracture of site splice welds at the River Mardle Viaduct

The River Mardle Viaduct is a curved, twin box girder bridge, spanning a total length of 177 m. Four continuous spans carry the A38 trunk road over the River Mardle and Old Totnes Road. The bridge forms an important part of the heavy load network in and out of the tourist areas of Devon and Cornwall. In September 2001, an initial inspection of the site splice welds joining the box girders detected a series of large imperfections. These weld defects were confirmed by a further independent inspection 6 months later and the results subsequently analysed using detailed fracture mechanics. The results of the fatigue analysis and the implications to the structural integrity of the bridge are discussed in this paper.     

基于属性约简和相对熵的离群点检测算法

本研究结合信息熵与粗糙集理论中的属性约简技术,提出了一种新颖的离群点检测算法。这种方法通过在更小的属性子空间去获得相同或相近的离群数据集,使对离群数据的分析更加集中于较小的目标域。该算法对原属性空间进行划分,通过分析计算将具有最大相对熵与负相对势的对象集合判定为离群点集合。为了验证算法的有效性,还在通用数据集上进行了测试,理论分析和实验结果表明该离群点检测算法是有效可行的。