基于变分模态分解的水下目标噪声特征提取及分类

当信号中存在异常事件引起的间歇现象时,传统的经验模态分解算法常易产生较为严重的模态混叠现象,严重影响目标特征提取的性能.文章在水下被动目标信号特征分析提取中引用变分模态分解算法.该方法能够自适应地对信号频带进行切割,极大程度上避免了传统模态分解算法所产生的模态混叠现象,提高了对目标特征提取的准确性,同时也避免了无效计算...     

一类特殊型行列式及其应用

给出了Ｖａｎｄｅｒｍｏｎｄｅ行列式的一类特殊型行列式的计算公式及其应用。进一步完善了Ｖａｎｄｅｒｍｏｎｄｅ行列式的理论，并加宽了应用范围。     

Local dynamics and stability of apocytochrome b562 examined by hydrogen exchange

Cytochrome b562 is a heme-binding protein consisting of four helices folded into a classic helix bundle motif. Though retaining much of the topology of the holoprotein, apocytochrome b562 displays physical features commonly associated with so-called protein molten globules. Here, the stability and dynamics of this "structured" molten globule are probed by examination of the dependence of its hydrogen exchange behavior upon the presence of a chemical denaturant. Compared to other systems studied in this manner, apocytochrome b562 displays a limited dynamic range of hydrogen exchange rates and the analysis required the development of a quantitative approach. The protein is found to have three regions of subglobal cooperative stability. The most stable region, or core, is composed of the central two helices of the bundle, with the N- and C-terminal helices being of independent and lower stability. The dependence of the global unfolding free energy upon denaturant concentration indicates the applicability of a binding model and explains the observed difference between global unfolding free energies obtained by the linear extrapolation method and those obtained by calorimetry and hydrogen exchange. These observations place a significant restraint upon the type of folding pathway that is operative for this protein and suggest that that the N- and C-terminal helices fold and unfold independently of the core of the molecule.     

RSView32和MATLAB之间的通讯

MATLAB是一种具有强大的矩阵处理功能和绘图功能的应用软件。在许多复杂工程应用中，需要将MATLAB和其他软件交互协同工作。本文介绍了MATLAB与罗克韦尔公司的RSView32的特点，并重点论述了他们之间的通讯方法。     

滑坡灾害风险分析研究

本文对滑坡灾害的风险分析理论进行了探讨 ,阐述了影响斜坡稳定性的不确定性因素及风险 ,对国内外的滑坡灾害风险研究作了评述 ,分析了滑坡灾害的可接受风险水平。把滑坡灾害的风险评价确定为一个动态过程 ,分别从危险性评价、社会经济易损性评价、破坏损失评价和防治工程评价等方面进行综合性的评价 ,由此建立滑坡灾害的风险评价体系。     

最佳差分算子在P-SV波正演模拟中的应用

本文提出用最佳差分技术模拟在二维非均匀介质中传播的Ｐ－ＳＶ波。只要这种方法的差分算子半长度取成４－６，每最短波长取３个空间网格点就可得到精度很高的弹性波正演模拟结果。用最佳差分算子模拟Ｐ－ＳＶ波的计算速度比用传统差分格式至少快一个数量级，比目前公认的速度较快的伪谱法还要快３－５倍。     

地下室大体积砼施工及防水措施

在泉州市中山公园人防工程主体施工中 ,为保证大体积混凝土不产生冷缝与开裂 ,应注意结合现场实际进行板带的计算划分 ,并在施工防水中加强各个节点及构造的处理 ,从而杜绝渗漏现象