基于监测数据的悬索桥关键约束装置状态评估方法

为更准确地评估大跨径悬索桥的伸缩功能,及时发现病害,在现阶段基于监测数据的伸缩缝、支座状态评估通用方法的基础上,将伸缩缝和支座状态评估相结合,提出了基于监测数据的悬索桥关键约束装置状态评估方法.该方法采用小波分离法对位移数据进行波形分离,通过温度位移一致性分析并根据数据细节变化幅度分析桥梁伸缩异常阻力及其对应的病害,对...     

基于BP神经网络的彩色光弹性等色线自动定级法

把人工神经网络与光学彩色信息图像处理技术相结合，根据计算机的特点，选取红绿蓝（RGB）颜色模型，通过BP神经网络建立图像中像素点的RGB值与条纹级数F之间的非线性关系，对彩色光弹性条纹进行了插值，从而实现了等色线条纹的自动定级，用对径受压圆盘问题的理论精确解来检验，表明本方法与传统的分数级条纹补偿法相比，不仅可以实现条纹定级技术的自动化，而且精度较高，对提高三维结构光弹性模型切片的等色线测量精度有实用价值。     

Application of EEG multipole model in the diagnosis of Alzheimer''''s disease

In order to find the electroencephalogram （EEG） characteristic parameters typical of Alzheimer＇s disease （AD） and explore an effective diagnostic method, a new mobile current multipole model was proposed to simulate the AD patient＇s cortical dipole source activities. The indicators of goodness of fit （GOF） and DtononD （DD） were calculated from EEG samples to evaluate the performance of this model. Relevant results showed that this multipole model with higher GOFvalues and larger DD change well fitted the pathological electrical activities of cortical neurons aroused by AD＇s extended sulcus and gyrus in the cerebral cortex. Meanwhile, the products of DD mean ＆ standard variance were found in a clear linear correlation with the diagnostic data of mini-mental state examination （MMSE） used in AD clinics. Furthermore, by tracing this multipole model＇s indicators in typical patients and contrasting with the functional magnetic resonance image （fMRI） as AD progressed, we suggested that the DD index may be suitable for monitoring the AD developments as a new diagnostic parameter.     

江泽民质量建军思想探析

江泽民是邓小平之后党和国家最高领导人,是中国人民解放军的最高统帅,他提出了新时期军队建设的许多新思想,极大地丰富了邓小平新时期军队建设思想的理论宝库,对我军建设有着极其重大的现实意义和深远的历史意义.     

A separate two-stage pulse tube cooler working at liquid helium temperature

A novel 4 K separate two-stage pulse tube cooler (PTC) was designed and tested. The cooler consists of two separate pulse tube coolers, in which the cold end of the first stage regenerator is thermally connected with the middle part of the second regenerator. Compared to the traditional coupled multi-stage pulse tube cooler, the mutual interference between stages can be significantly eliminated. The lowest refrigeration temperature obtained at the first stage pulse tube was 13.8 K. This is a new record for singlestage PTC. With two compressors and two rotary valves driving mode, the separate two-stage PTC obtained a refrigeration temperature of 2.5K at the second stage. Cooling capacities of 508mW at 4.2K and 15W at 37.5K were achieved simultaneously. A one-compressor and one-rotary valve driving mode has been proposed to further simplify the structure of separate type PTC.     

石墨烯专利技术国际研发态势分析

石墨烯是物理学、化学、材料科学等领域近年来的研究热点之一。因其集优异的电学、力学、光学、化学和热学等性能于一身,石墨烯已经成为一个备受关注、竞争非常激烈的新兴技术领域,近年来全球相关专利申请数量持续快速增长。该文基于DII数据库,利用TDA、Aureka等分析工具,对全球石墨烯相关专利进行了分析,揭示了全球石墨烯相关专利技术的研发和竞争态势。     

模型参数不确定的连续系统自学习定性控制

对模型中含有不确定性因素的非线性系统给出了一种定性控制方法,避免了模糊控制器设计中存在的主观性和模糊规则难以获取等缺点．先将状态进行定性划分,再对每个定性状态根据期望约束利用不精确模型求出控制的参考范围及初值,最后对控制量在线自学习调整．此方法具有模糊控制的控制效果．     

牦牛肝片吸虫四种抗原交叉免疫印迹分析

用牦牛肝片吸虫四种抗原分别制备四种抗血清，其ＥＳＩＳＡ效价 １：８００，１：１６００，１：３２００和１：８００．ＳＤＳ－ＰＡＧＥ电泳区带组分分别为２５，２４，１８和９条带；免疫印迹结果，各种抗清与相庆抗原作用的主要抗原成份分别为５，１０，７和３；四种抗原中存在的共同抗原为１７．２ｋＤ；特征抗原ＨＡ为２９．９ｋＤ，ＳＡ为２７．２ｋＤ的２４．３ｋＤ；正常兔血清与各个抗原间均未出现免疫反应。     

一种快速、高效的混合小波-分形图像编码方法

作者结合了分形编码和小波编码的优点,提出了一种高效而快速的小波与分形编码相结合的混合图像编码方法。其基本思路为,将小波分解后的图像的低频系数用基于方差的快速分形方法编码,剩余的高频系数用经过修改的SPIHT算法进行编码。实验证明,该混合算法避免了分形编码所固有的方块效应,同时比传统的分形编码相比,大大节约了编码时间,说明该算法具有一定合理性与优越性。     

用水深平均雷诺方程模拟有限长直立圆柱绕流

本文用水深平均雷诺方程和水深平均ｋ－ε方程,模拟在浅水宽阔水域中有限长直立式圆柱的绕流．在水深平均后的方程中,由于水深不均匀性所增加的修正源项,改善了控制方程的可解性,保证了在整个计算过程中ｋ和ε值非负．用结构块贴体坐标系方法生成的ＯＣ型网格,为计算提供了良好网格条件．用有限差分法和余量校正法进行离散和计算．本文计算了雷诺数为１２００的圆柱绕流,与Ｎａｇａｔａ的实验结果有很好的一致性．作为尝试,本文还计算了雷诺数为１０５的圆柱绕流,得到了很好的计算结果．