复合地层盾构刀盘掘进速率及受力特性分析

为探究复合地层中盾构刀盘的掘进速率及受力特性,基于连续-非连续单元法(CDEM),建立盾构-岩土体这一完整系统的数值计算模型。通过在CDEM中引入简单有限体积法、虚拟质量法、单元溶蚀算法等系列算法,实现盾构刀盘掘进全过程的三维模拟。建立5种刀盘面花岗岩占比的刀盘破岩数值模型,并对不同刀盘面花岗岩占比下的刀盘进尺、掘进速率、平均转矩、平均倾覆力矩等进行详细分析。数值模拟结果表明:1)在某一特定复合地层中掘进时,随着掘进时间增加,刀盘进尺基本呈线性增大的趋势,但进尺曲线中平缓段及速升段交替循环出现; 2)刀盘面花岗岩占比由0增大至100%,掌子面处拉伸破坏单元增加,剪切破坏单元减少,且刀盘的掘进速率呈指数衰减趋势,掘进速率降低88. 7%; 3)刀盘面花岗岩占比由0增大至100%,平均转矩值逐渐增大,增大比例为117. 5%,平均倾覆力矩值则呈现先增大后减小的趋势,且在花岗岩占比为50%时最大

Improved FCM algorithm using difference of neighborhood information

为了克服模糊C均值(fCM)无法处理图像噪声的缺点以及常用改进算法分割不足,提出了一种利用邻域差异性信息的fCM改进算法。利用高斯函数来合理刻画邻域间像素的空间位置和灰度差异特性,实现对中心像素隶属度的调整,达到分割噪声图像的目的。实验证明,该算法可以有效地处理高斯和椒盐噪声,在去除噪声的同时较完整地保留了图像的细节,其分割效果优于几种常用fCM改进算法。In order to overcome the shortcoming of Fuzzy C-means(FCM) that cannot deal with image noise and weaknesses of its common improved algorithms,an improved FCM algorithm using the difference of neighborhood information was proposed in this paper,which used Gaussian function to characterize the difference of space and gray value about neighborhood pixels reasonably,and to adjust the center pixel membership to achieve the purpose of noise image segmentation.The experimental results show that the proposed algorithm can effectively deal with the images with Gaussian and Pepper & Salt noise,and can remove the noise while retaining more complete details of image.Its segmentation results are better than several improved FCM algorithms in the literatures.福建省自然科学基金资助项目(2008J0312);南京军区“十一五”计划项目(06MA99);南京军区重点课题资助项目(08Z021

Fast and stable local bianry fitting approach for image segmentation

基于局部区域信息的局部二元拟合(lbf)模型在处理弱边界或灰度不均匀的图像分割方面有一定优势,但该方法非常依赖于初始轮廓,不当的初始轮廓不仅会导致分割时间较长,甚至分割失败。针对这一不足,提出一种快速稳定的lbf模型。首先通过添加带有变权系数面积项的lbf模型进行初始分类以获取较好的初始轮廓,然后采用传统的lbf模型对图像进行进一步的分割。实验证明,在保证良好分割效果的前提下,该方法对初始轮廓的选择更加灵活,分割速度明显快于传统的lbf模型。The Local Binary Fitting(LBF) model based on local region information has its certain advantages in image segmentation of weak boundary or uneven greay.But,the segmentation results are very sensitive to the initial contours,and improper initial contour can directly lead to segmentation failure.Thus,a fast and stable LBF approach was proposed.First,after adding the area item with variable weights to the traditional LBF model,better initial contour could be obtained than manual one.Second,the traditional LBF model would be used for further segmentation.The experimental results show that,under the precondition of preferable results,this method can not only get promising segmentation results with flexible initial contour selection,but also faster than the traditional LBF model.福建省自然科学基金项目资助项目(2008J0312);南京军区“十一五”计划项目(06MA99);南京军区重点项目(08Z021

Improved method of adaptive weight FCM combining random field

传统模糊C均值的隶属度场利用了像素的单点灰度信息,有利于算法保留细节,但去噪能力较弱;而图像的gIbbS随机场较好地刻画了像素的空间分布,有利于算法去噪,但在保留细节方面较差。该文利用邻域信息,动态地判断像素可能所在的位置,对两种场的权重进行自适应调整,从而实现两种场的优势互补。实验表明,该文自适应加权算法在去除噪声的同时可以保留更多的细节。Membership field of traditional fuzzy C means algorithm consider gray information of single pixel only,which is beneficial to retain details but weak in denoising an image.On the other hands,Gibbs random field depicts the spatial distribution of pixels,which is beneficial to smooth noise but poor at retaining image details.Thus,an improved method is proposed to take advantages over the two algorithms respectively,which can automatically determine the possible location of a pixel and adjust the proportion of the two fields according to neighborhood information of a pixel.Experiments show that the improved algorithm can adjust the weight of two fields adaptively to remove the noise while preserving more details.福建省自然科学基金No.2008J0312;南京军区“十一五”计划课题项目;南京军区重点课题---

pH影响真鲷仔、幼鱼蛋白酶活性的研究

真鲷仔、幼鱼蛋白酶活性的最适PH随生长发育而变化。仔鱼期蛋白酶比活力峰值和次峰值出现在PH6.0和5.0；幼鱼期胃蛋白酶最适PH在2.2以下，肠和肝胰脏蛋白酶最适PH在10.0以上。真鲷仔幼鱼蛋白酶活性的变化与消化系统的发育和功能完善有关；育苗过程中使用单一铒料导致仔幼鱼的不适应，是育苗中仔稚鱼期死亡率高的原因之一。福建省自然科学基

Advance in Pyrolysis and Gasification of Combustible Solid Waste and Engineering Simulation Study

简要介绍了目前国内城市生活垃圾的产生现状及其主要的处理方法。概述了典型可燃固体废弃物的热解气化实验进展和基于AspenPlus平台模拟的研究现状以及热解气化技术的应用情况。分析总结了热解温度和加热速率对热解产物分布及其产量的影响,以及空气燃料比和气化温度对气化过程的影响。基于AspenPlus平台的热解气化模型能够很好地模拟实际热解气化过程,具有较好的可靠性和实用性。指出可燃固废热解气化实验今后的研究重点及AspenPlus平台模拟研究的着重考虑因素

Construction of PLA's Medical Evacuation System Based on Tactical Medical Coordination System and Evacuation Support System of Foreign Army

介绍了美军战术医疗协调系统(TACMEdCS)和挪威医疗后送支持系统(EVACSyS)功能,追溯其系统更新换代的发展历程和所取得的各类测试成果,启发并指导军队医疗后送信息系统建设,避免走弯路和盲目性建设,并提出整合军队现有的野战信息资源的意见和建议。The function of TacmedCS and EvacSys of US army is introduced,and the update process and the test results are reviewed.Thus,some discussions and advices are proposed to integrate the limited field information resource to avoid some non-necessary steps and blind construction in the medical and evacuation system.福建省自然科学基金项目(2008J0312);军区重点课题(08Z021);南京军区“十一五”计划课题项目(06MA99

毫米波MIMO系统中混合预编码算法研究

为有效提升多输入多输出系统的频谱效率,降低算法复杂度,文章提出了一种基于迭代思想的矩阵分解算法。首先初始化模拟预编码矩阵并获取最优预编码矩阵;然后通过模拟预编码矩阵与最优预编码矩阵来获取数字预编码矩阵,通过提取数字预编码矩阵中的相位信息更新模拟预编码矩阵,利用已更新的模拟矩阵来更新数字矩阵;最后通过不断交替迭代直到收敛。仿真结果表明,所提算法具有较低的复杂度且更接近纯数字预编码性能

Self-adaptive Level Set Fusing Algorithm

在处理不均匀图像时,自适应距离保持水平集演化(AdPlS)算法速度快、不受初始轮廓影响,但精度较低;lbf算法精度高,但速度较慢同时易受初始轮廓影响。针对上述2种算法的优缺点,提出一种新的自适应融合算法。该算法根据图像信息自动调整AdPlS与局部二值拟合算法在融合算法中所占比重,实现不同算法的优势互补。实验结果证明,该融合算法在分割精度、速度及稳定性等方面有明显提高。In intensity inhomogeneity image segmentation,the Adaptive Distance Preserving Level Set Evolution(ADPLS) algorithm can get a result with high speed,low accuracy and has no relation to initial contour,on the other hand,the Local Binary Fitting(LBF) algorithm can get a result with high accuracy,low speed and its result is sensitive to initial contour.Thus,a novel and adaptive fusing level set method is proposed to make use their advantages respectively,which can automatically adjust the proportion of ADPLS and LBF in the fusing method according to image information.Experiment results show that the comprehensive performance indicators,such as accuracy,speed and stability can be significantly improved in the fusing method.福建省自然科学基金资助项目(2008J0312);国家部委基金资助项目(06MA99;08Z021

mass customization methods of the managerial software

管理软件的成功率很低,其主要原因之一是企业空间和时间个性化与软件通用化的矛盾.大批量定制方法可以较好地解决这一问题.本文分析了管理软件的大批量定制的主要依据,归纳和提出了主要方法,并对其中的组件技术进行了分析.组件技术的概念和方法与成组技术是相通的