液氮发动机的防霜换热器温度场模拟

介绍了液氮发动机系统上的防霜换热器的基本结构，给出了无量纲换热能量方程组及边界条件和初始条件，描述了微分方程离散化方法以及网格划分方法，计算机模拟结果显示了防霜换热器中的二维或三维温度分布，计算机模拟的氮气的出口温度为293．05K，与设计要求温度293．15K基本一致。     

企业人力资本价值体系及薪酬模式的探讨

人力资本价值如何参与企业收益分配是当代人力资源管理及会计中的重点、难点,在坚持按劳分配为主体的前提下,本文详细地阐述了人力资本的定义、价值体系及其计量,重点论述了以人力资本的价值为基础的现代企业“人力资本激励薪酬模式”,并对现代企业利益分配提出了若干改进建议,具有一定的创新性和可行性。     

Networked 3D Virtual Museum System

1 Introduction1 Based on the technology fusion of information technologywith cultural and natural heritage, virtual heritage technology has been emerging with the culture technology. Especially, new media technologies, from 3D media technology to virtual reality, are very promising ones expected to satisfy heritage representation such as the naturalness, the sensation of depth, realism andtangibility . Moreover, virtual heritage technology can provide us the virtual exploration of heritage th…     

载荷谱的直接生成法

本文讨论了生成阶梯载荷谱的问题,应用等损伤条件,导出了一种确定每级阶梯载荷及其频次数的算法。该算法可由载荷概率密度函数直接生成阶梯载荷谱。     

拉萨河尖裸鲤（Oxygymnocypris stewartii）肌肉营养组成与分析评价

采用常规生化检测方法测定了拉萨河尖裸鲤（Oxygymnocypris stewartii）肌肉主要营养成分,并首次对肌肉中的23种脂肪酸进行检测。结果显示：拉萨河尖裸鲤肌肉（干样）中蛋白质含量为74.40%,4种微量营养元素钙（Ca）1.85%、镁（Mg）1.48%、钾（K）1.68%、磷（P）0.68%;肌肉中含有17种氨基酸,其中7种人体必需氨基酸总量为25.96%,4种鲜味氨基酸的总量为23.39%;肌肉中含量较高的23种脂肪酸中,n-3型（EPA）与n-6型（DHA）含量分别为39.27%和5.38%,比其他淡水经济鱼类含量高。研究表明拉萨河尖裸鲤具有较高的食用价值和开发前景。     

A new method for splice site prediction based on the sequence patterns of splicing signals and regulatory elements

It is of significance for splice site prediction to develop novel algorithms that combine the sequence patterns of regulatory elements such as enhancers and silencers with the patterns of splicing signals. In this paper, a statistical model of splicing signals was built based on the entropy density profile （EDP） method, weight array method （WAM） and K test; moreover, the model of splicing regulatory elements was developed by an unsupervised self-learning method to detect motifs associated with regulatory elements. With two models incorporated, a multi-level support vector machine （SVM） system was devised to perform ab initio prediction for splice sites originating from DNA sequence in eukaryotic genome. Results of large scale tests on human genomic splice sites show that the new method achieves a comparative high performance in splice site prediction. The method is demonstrated to be with at least the same level of performance and usually better performance than the existing SpliceScan method based on modeling regulatory elements, and shown to have higher accuracies than the traditional methods with modeling splicing signals such as the GeneSplicer. In particular, the method has evident advantage over splice site prediction for the genes with lower GC content.     

生态多孔混凝土抗草酸侵蚀试验

预制了不同粉煤灰及矿渣掺量的7组生态多孔混凝土试件,研究了7组试件经p H值恒为2.0及3.0的草酸溶液侵蚀后,其强度和质量的变化。试验结果表明:生态多孔混凝土经草酸侵蚀后,强度和质量明显下降,且侵蚀时间越长,强度和质量的下降量越大;随着矿物掺合料掺量的增加,混凝土强度逐渐降低,但掺矿物掺合料对改善生态多孔混凝土的抗草酸侵蚀效果不明显;当矿物掺合料掺量相同时,经草酸侵蚀后,掺粉煤灰混凝土的强度较掺矿渣的强度降低量小,因此,掺粉煤灰混凝土的抗草酸侵蚀性能好于掺矿渣混凝土。     

Dendritic and spherical crystal reinforced metallic glass matrix composites

Zr-based bulk metallic glass matrix composites (BMGMCs) with a composition of Zr_60.0Ti_14.7Nb_5.3Cu_5.6Ni_4.4Be_10.0 (at%) were fabricated by an innovative process, i.e., semisolid processing plus Bridgman solidification. Different morphologies, distributions, and volume fractions of the crystalline phases can be achieved by tailoring the withdrawal velocity. The largest fracture strain of Zr_60.0Ti_14.7Nb_5.3Cu_5.6Ni_4.4Be_10.0(at%) composites with the withdrawal velocity of 1.0 mm/s was found to be 16.7%. The mechanism of plasticity improvement is mainly attributed to the interpenetrated structure of the crystalline phase, which greatly confines the rapid propagation of shear bands.     

基于形状特征的物体匹配方法研究

针对基于形状特征的物体匹配,对精尺度图像提出一种分层罔匹配算法.采用两条马尔可夫链同时对图形进行分割与匹配采样.该方法无需额外的学习训练过程,实现了将物体对象与复杂背景分离,并同时完成了匹配参数及能量计算.对粗尺度图像提出基于方向梯度直方图算子的图像匹配算法,利用物体的整体形状信息进行全局匹配,能忽略局部纹理的干扰,并具有运算速度快的优点,且与分层图匹配算法在计算尺度图像及速度上形成互补.结果表明,分层图匹配算法在100次迭代内便能实现精确匹配.