PASSIM 7K卷接机组刀头共振问题的解决

部分进口PASSIM 7K和国产YJ19卷接机组存在刀头共振现象,共振现象不仅产生异常噪声、影响环境,还降低了刀头部分的运动精度,影响烟支质量,同时降低了机器的使用寿命.通过采用改变齿轮侧隙的方法,降低了齿轮的振动强度,从而减少了共振的影响.     

PBT短纤维的物理特性与成纱性能初探

通过对PBT（聚对苯二甲酸丁二醇酯）短纤维的物理特性,成纱强伸性能和条平均匀度的测试研究,结果表明：PBT短纤维在经过染色,高温及碱处理之后具有良好的强伸性能和弹性恢复性能,并且BPT短纤维具有较好的可纺性,其成纱强伸性能优良。     

智能剥离工艺的热动力学模型(英文)

提出了注氢硅片表面借助键合氧化硅片进行剥离的热动力学模型 ,这种剥离现象是退火过程中氢离子注入区氢气泡横向增长的结果 .氢气泡的增长速率依赖于氢复合体分解和氢分子扩散所需的激活能 ,氢气泡的半径是退火时间、退火温度和注氢剂量的函数 .氢气泡的临界半径可根据 Griffith能量平衡条件来获得 .根据氢气泡增长的这一临界条件 ,获得了不同劈裂温度时所需的剥离时间     

Algorithms for multicommodity flows in planar graphs

This paper gives efficient algorithms for the muiticommodity flow problem for two classes C₁₂ and C₀₁ of planar undirected graphs. Every graph in C₁₂ has two face boundaries B₁ and B₂ such that each of the source-sink pairs lies on B₁ or B₂. On the other hand, every graph inC ₀₁ has a face boundaryB ₁ such that some of the source-sink pairs lie onB ₁ and all the other pairs share a common sink lying onB ₁. The algorithms run inO(kn +nT(n)) time if a graph hasn vertices andk source-sink pairs andT(n) is the time required for finding the single-source shortest paths in a planar graph ofn vertices.     

A geometrical model of the cut in five-axis milling accounting for the influence of tool orientation

This paper presents a model of the cut geometry in five-axis milling. This allows the establishment of a better model of cutting force to account for the influence of the tool orientation. The formulation of the width and the thickness of the cut were derived and implemented in a computer simulation. The results of simulations were verified experimentally and a good agreement was obtained. The result shows the importance of including the influence of the tool orientation in the cut cross-section calculation.     

The prediction of cutting force in milling Inconel-718

Due to the enormous engineering advancement in modern industries, the competition in manufacturing technologies has been increasingly intense, as can be seen in automobile and aerospace industries. Nickel-based superalloys are widely in the manufacture of components for aircraft turbine engines for cryogenic tankage, in liquid rockets, reciprocating engines, space vehicles, heat-treating equipment, chemical and petrochemical industries, because of their ability to retain high-strength at elevated temperatures. But, because of its characteristics of high-strength, poor thermal diffusion and work hardening, the cutting of nickel-based superalloys results in decreased tool life and poor efficiency of works. This is much more prominent than in other materials. AISI4340 are widely used in the manufacture of component parts for gear, pistons, and automobiles.     

生产矿山入磨铁矿石最低品位的探讨

通过对庙沟铁矿矿石采出和干选抛尾环节选定入磨矿石最低品位的探讨，提出入磨矿石在这两个环节的控制标准及其计算方法     

中国低空大气波导的极限频率和穿透角

本文利用９０～９２年三年的探空数据对我国各地大气波导的极限频率和穿透角作了计算，说明了各地波导极限频率和穿透角的最小值、最大值、平均值和标准误差、众数的情况，并对贴地波导和悬空波导的情况分别给予了说明。列出了波导出现较多的代表性地区波导的极限频率和穿透角的统计结果及月平均值。结果表明我国大气波导的极限频率可低至数ＭＨｚ，穿透角最大可达０．８°。而在平均值上，我国低空大气波导主要影响频率在３０ＭＨｚ以上的电波，穿透角一般不大于０．４°     

基于外积取等准则的联想记忆神经网络同步运行收敛性分析

通过引入入样本模式向量割、割等价及割互补的概念，了基于外积取等准则的联想记忆神经在同步运行方式下的收敛性，得出对任意输入网络至多两步收剑。     

Automated generation of simply connected solid objects from wire-frame data using operations on graphs

This paper presents an algorithm for the automatic generation of solid objects from three-dimensional wire-frame data. In this work, as we mainly use topological information of wire-frame data, we can achieve high-speed execution and adapt this algorithm to free-from surfaces. We present the conversion algorithm and show several experimental results.