Research and Application of All-Position Automatic Welding Machine

The all-position automatic welding machine system is the special welding system for pipeline girth automatic welding on site, which has been widely used in the long distance pipeline construction projects due to the advantages of automatic control for welding parameters at all position, moving speed of bugs and operating. This automatic pipeline welding system has been successfully used in several main pipeline projects in China, and has been approved by the constructors with the benefits of higher quality passing rate, higher welding efficiency and lower labor intensity.     

求解两人博弈纳什平衡问题的定制临近点算法

针对一类不允许校正的两人轮流博弈纳什平衡问题,提出一种定制临近点分裂算法.该算法可用于模拟一种实际博弈活动:参与博弈的两个局中人轮流决策,且在一轮博弈中,每位局中人综合考虑对手上一轮与本轮所给出的决策,根据最优响应规则做出自己的相应决策.在一定假设条件下证明定制临近点算法全局地收敛到所考虑博弈的纳什平衡,数值算例验证了算法的有效性.     

基于稀疏转稠密机制的仿射不变特征匹配算法

提出一种基于稀疏、稠密特征转换的仿射不变特征匹配算法,其中稀疏特征包括坐标,尺度,仿射模拟参数等,稠密特征指基于图像局部区域内光学属性的局部描述符.本文算法在Affine-SIFT算法基础之上,针对在特征提取阶段仅使用稀疏特征提取的缺陷做出了改进.由于稠密信息只有在稀疏参数满一定足检测条件时才能提取到特征,导致本可以匹配到的特征(包括稀疏、稠密参数)无法提取,将通过使用稀疏特征构造新的模拟图像,通过将稀疏特征重新稠密化,并在模拟图像基础上进一步提取稀疏特征,同时可检测到原始图像中检测不到的可匹配特征,最终达到增大特征建立匹配的概率,提升正确匹配数量的目标.经实验验证,本文提出的稀密特征转换算法相比于ASIFT算法能大量增加特征匹配的数量.除针对ASIFT方法提供扩展外,该方法也可用于扩展具有充分稀疏特征参数的其它特征提取和匹配方法,并适用于目标识别、目标分类和三维重建等问题.     

多分量地震监测系统AETA的研究与实现

研制多分量地震监测系统AETA(acoustic & electro-magnetic testing all in one system)。在云南、四川、西藏、河北、北京、广东等地区的现场实验表明, 该系统能够满足大区域密集布设中高灵敏度、低成本和易布设的需求。同时, 若干点的实验观测数据和均值、振铃率、峰值频率在一定程度上反映了映震效果。目前正在中国西南部、首都圈、台湾海峡等地区密集布设, 系统地开展映震效果研究。     

A framework for personalized adaptive user interest prediction based on topic model and forgetting mechanism

User interest is not static and changes dynamically. In the scenario of a search engine, this paper presents a personalized adaptive user interest prediction framework. It represents user interest as a topic distribution, captures every change of user interest in the history, and uses the changes to predict future individual user interest dynamically. More specifically, it first uses a personalized user interest representation model to infer user interest from queries in the user’s history data using a topic model; then it presents a personalized user interest prediction model to capture the dynamic changes of user interest and to predict future user interest by leveraging the query submission time in the history data. Compared with the Interest Degree Multi-Stage Quantization Model, experiment results on an AOL Search Query Log query log show that our framework is more stable and effective in user interest prediction.     

可迹图的谱半径条件

本文研究的是简单图,它的邻接矩阵是表示顶点之间相邻关系的矩阵,它的最大特征值被定义为图的谱半径。如果图中有一条包含图中所有顶点的路,则称这条路为哈密尔顿路;如果一个图含有哈密顿路,则称该图是可迹图。设图具有最小度条件,本文主要利用图的补图的谱半径给出图是可迹图的充分条件。     

基于电场感应的水下无线电力传输

为了验证水下电能传输的可行性和研究影响传输效率的因素,采用电场耦合原理进行了简单的无线充电电路设计,对电场耦合式无线电能传输的系统结构和基本工作原理进行介绍,分析了其相比于磁场耦合方式的特点,以及由此带来的相应优势,通过多物理场仿真模拟极板间电场分布,设计了一种LC双边的CPT系统,采用单片机组成脉宽调制控制电路并用功率放大电路模块组成发射端和接收端。结果表明了运用电场耦合原理进行无线充电的可行性,在研究中发现极板间的传输距离是影响水下无线充电效率的一个因素,而且两个电极之间的杂散电容也会影响极板间的功率,所以由于极板间隙的存在极板间的功率损耗较大。所提出的LC双边CPT系统,不仅实现了水下无线电能传输,还保证了在一定距离和频率下传输效率的稳定。     

Crystallographic texture and earing behavior analysis for different second cold reductions of double-reduction tinplate

Since the production of tinplate with non-earing properties is difficult, especially when it is produced via the double-reduction process, the optimal degree of second cold reduction is particularly important for achieving desirable drawing properties. The evolution of texture and the earing propensity of double-reduction tinplate with different extents of second reduction were investigated in this study. Optical microscopy and scanning electron microscopy were used to observe the changes in the microstructure at various extents of reduction. Two common testing methods, X-ray diffraction (XRD) and electron backscatter diffraction, were used to investigate the texture of the specimens, which revealed the effects of deformation percentage on the final texture development and the change in the grain boundary. The earing rate was determined via earing tests involving measurement of the height of any ear. The results obtained from both XRD analyses and earing tests revealed the same ideal value for the second cold reduction on the basis of the relationship between crystallographic texture and the degree of earing.     

Process mineralogy characteristics of acid leaching residue produced in low-temperature roasting-acid leaching pretreatment process of refractory gold concentrates

To provide a theoretical basis for a suitable process to extract gold from refractory gold concentrates, process mineralogy on the acid leaching residue of gold calcine was studied by chemical composition, X-ray diffraction, scanning electron microscopy-energy spectrum, and mineral dissociation analysis. The results showed that the acid leaching residue contained Au 68.22 g/t, Ag 92.71 g/t, Fe 0.44%, As 0.10%, and S 0.55%. Gold and silver minerals existed as native gold, argentite, and proustite. Quartz, the main gangue mineral, accounted for 78.33wt/%. The dissociation degree analysis showed that the proportions of monomer and exposed gold in acid leaching residue were 96.66wt%. The cyanidation results showed that the cyanide gold leaching rate of acid leaching residues was close to 100wt%. However, the maximum cyanide gold leaching rate of gold calcine was only 85.31wt%. This suggests that acid leaching can increase the gold dissolution rate in the cyanide process.     

Thermal performance and reduction kinetic analysis of cold-bonded pellets with CO and H_2 mixtures

Cold-bonded pellets, to which a new type of inorganic binder was applied, were reduced by H2–CO mixtures with different H2/CO molar ratios(1:0, 5:2, 1:1, 2:5, and 0:1) under various temperatures(1023, 1123, 1223, 1323, and 1423 K) in a thermogravimetric analysis apparatus. The effects of gas composition, temperature, and binder ratio on the reduction process were studied, and the microstructure of reduced pellets was observed by scanning electron microscopy–energy-dispersive spectrometry(SEM-EDS). The SEM-EDS images show that binder particles exist in pellets in two forms, and the form that binder particles completely surround ore particles has a more significant hinder effect on the reduction. The reduction equilibrium constant, effective diffusion coefficient, and the reaction rate constant were calculated on the basis of the unreacted core model, and the promotion effect of temperature on reduction was further analyzed. The results show that no sintering phenomenon occurred at low temperatures and that the increasing reaction rate constant and high gas diffusion coefficient could maintain the promotion effect of temperature; however, when the sintering phenomenon occurs at high temperatures, gas diffusion is hindered and the promotion effect is diminished. The contribution of the overall equilibrium constant to the promotion effect depends on the gas composition.