移动IPv6网络家乡代理容错方法研究

移动IPv6基于家乡代理的转发,实现节点移动过程中的可寻址性.提出主动检测和迁移的家乡代理容错方法,通过在家乡代理之间设计环状检测和备份链,使家乡代理之间相互检测失效情况的发生;所有注册信息在家乡链路上仅备份一次;检测到失效后,有效家乡代理自动地暂时接管失效家乡代理的工作,并主动通告给相关移动节点;移动节点收到家乡代理失效信息后,主动启动恢复过程.给出了实现该方法的数据结构和容错算法,描述了具体的容错处理过程.通过理论分析证明了该方法比协议标准中的方法具有更小的容错时间和信令开销,特别是在移动节点的移动频率较慢的情况下更是如此.     

Comparison of Skidding Performance of Small Track-type Experimental Prototype Skidder and J-50 Skidding Tractor

In this paper, field experimental comparison is made between a small track-type experimental prototype skidder and a J-50 skidding tractor. Experimental data, including skidding productivity, soil compaction on skidding trails, and damage rate of the residual trees, are analyzed. The results indicate that with the condition of scattered skidding area and low skidding volume per cycle, small track-type experimental prototype skidder has advantage on working and a higher skidding productivity. It makes lower soil compaction to the skidding trails in the depth of 0-5 cm, 5-10 cm, and 10-15 cm. Under the same work conditions, the damage rate of the residual trees made by small track-type experimental prototype skidder is only 1/5 of those made by J-50 type skidding tractor. The damage rate is reduced by 80%.     

Silver(I) Polymer of Tripodal Amine: Synthesis,Structure and Photoluminescence

Starting from tripodal ligand tris-(methyl-imidazole) amine (1) the colourless complex tris-(methyl-imidazole)aminesilver(I)perchlorate (2) has been synthesized, characterized by IR, UV/Vis and ¹HNMR spectroscopic studies and finally solid state structure has been established by single crystal X-ray diffraction studies. A single crystal X-ray structure determination revealed the formation of coordination polymer. The crystal structure possesses weak d¹⁰–d¹⁰ ‘argentophilic’ interactions with Ag–Ag separation (3.348 Å). The weak luminance at 375 nm may be this Ag–Ag weak interaction. The molecule possesses weak H-bonding with C2 and C4H of imidazole with oxygen of ClO₄.     

自洁式空气滤清器的能耗分析

本文在常规车用空气滤清器和自洁式空气滤清器测试过程中阻力变化数据基础上,基于面积法对两者的总能耗数据进行对比分析和研究,得出影响空气滤清器能耗的关键因素,提出了如何延长空气滤清器滤芯使用寿命及降低空气滤清器能耗的有效解决办法,并给出了具体实施方案。     

一种实用的接地电阻测量新方法

在电力系统保护装置中,接地网是一个很重要的设施。从电流线与电压线30°夹角法接地电阻测试原理出发,指出在接地电阻测量过程中,若电流线与电压线呈30°夹角准确放线有困难时,可以通过多次不同角度放线测量方式。以补偿法获取较为准确的接地电阻,同时还可获取等效土壤电阻率。文中还通过实例计算验证了提出方法的可行性。     

Ribbed package geometry for reducing thermal warpage and wire sweepduring PBGA encapsulation

The effects of changing package shape to a ribbed geometry on thermal warpage and wire sweep of a plastic BGA (PBGA) are investigated in this paper. Three rib geometries (border, diagonal, and cross) with a variation of rib widths and thicknesses are compared with the original plane geometry. Finite element analyses of thermal warpage during the reflow process of PBGA molding with and without ribbed geometry are carried out. Numerical modeling shows that the border rib has the least thermal warpage at the reflow condition. Flow visualization was performed to study the effect of rib geometry on wire sweep, and demonstrates that the wire sweep in ribbed packages is significantly less than that in the original nonribbed package     

改进的基于增强型HOG的行人检测算法

行人检测在人工智能系统、车辆辅助驾驶系统和智能监控等领域具有重要的应用,是当前的研究热点.针对HOG特征不明显、支持向量机（SVM）分类器计算复杂度高,导致识别率低和检测速度慢的问题,本文提出了一种改进的基于增强型HOG的行人检测算法.该算法首先预处理原始图像并提取其HOG特征,然后增强该特征生成增强型HOG,经XGBoost分类器进行行人检测.在INRIA数据集上进行测试,实验结果表明所提算法识别率高达95.49%,有效地提高了行人检测性能.     

光伏玻璃的缺陷显著图检测

在光伏玻璃加工生产中,常常伴随着气泡、结石等可能对生产过程造成破坏性故障的缺陷,如何可靠地检测出玻璃的缺陷显得至关重要.为了有效地从周期性纹理中分离出缺陷,引入了一种基于图像对比和图像签名的方法计算显著图.一方面利用中央-周边算子求取候选显著图,另一方面先后对原图进行离散余弦变换,图像签名方法,反离散余弦变换和高斯模糊等方法求得重构显著图,最后通过线性乘将两个显著图进行融合.实验结果显示,本算法对玻璃缺陷的提取效果明显优于其他7个显著性算法.     

Micro-kinetic analysis and Monte Carlo simulation in methane partial oxidation into synthesis gas

The mechanism outlined in literature for methane steam reforming over nickel catalysts is reviewed. Activation energy of this set of elementary steps for methane conversion into synthesis gas is obtained on the basis of bond order conservation Morse potential (BOC-MP), and the pre-exponential factors of the rate expressions of these elementary steps are then estimated according to the reported ranges in literature. A real-time Monte Carlo approach is developed to simulate the micro-kinetic trends for this catalytic process.     

Study of heat transfer in multilayered structure within the framework of dual-phase-lag heat conduction model using lattice Boltzmann method

The effect of the phase lag of temperature gradient, τ_T, on the transmission-reflection phenomenon, induced by a pulsed thermal energy passing the interface of a two-layered structure, within the framework of dual-phase-lag based heat conduction equation is studied numerically by the lattice Boltzmann (LB) method. An extended LB equation, with truncation error of order two, and a numerical solution procedure are developed for the solution of the governing equation and the derived interfacial boundary condition. Results show that the interface reflects a negative followed by a positive waveform when the pulsed thermal wave propagates from the media with lower τ_T into the media with higher τ_T and vice versa if the wave propagates from higher into lower τ_T media. These special phenomena which have not been presented in the available literatures are unable to be predicted in the framework of hyperbolic heat conduction equation.