非均质储层三维水平井轨道设计研究与应用

为解决常规定向装备三维水平井施工难题，降低成本，对三维水平井道设计与应用进行了研究。通过分析三维轨道设计模型，对比其优势与不足，优选恒工具面角模型，针对"直-增-扭-稳-增-平"六段制典型轨道，从其基本公式和A靶点约束方程出发，建立了初始方位角模型，根据初始方位角得到造斜率和工具面角，进而计算出其他全部轨道参数，从而完成三维水平井轨道设计。在JH17P36井中应用该方法，采用常规装备施工，矢量中靶，实钻轨迹与设计符合率高，各技术指标优秀。钻井实例表明，计算模型和设计方法是正确、合理和可行的，同时也验证了恒工具面角模型的优越性。     

基于三菱FX2N系列PLC软元件数据实时改变与显示设计

介绍了一种利用变址寄存器预先设定软元件序号与设定值寄存器序号的对应关系的数据输入方法,可以对数据进行实时改变并显示,极大地方便了工作.     

An Approximation Scheme for Bin Packing with Conflicts

In this paper we consider the following bin packing problem with conflicts. Given a set of items V = {1,..., n} with sizes s₁,..., s (0,1) and a conflict graph G = (V, E), we consider the problem to find a packing for the items into bins of size one such that adjacent items (j, j) E are assigned to different bins. The goal is to find an assignment with a minimum number of bins. This problem is a natural generalization of the classical bin packing problem.We propose an asymptotic approximation scheme for the bin packing problem with conflicts restricted to d-inductive graphs with constant d. This graph class contains trees, grid graphs, planar graphs and graphs with constant treewidth. The algorithm finds an assignment for the items such that the generated number of bins is within a factor of (1 + ) of optimal provided that the optimum number is sufficiently large. The running time of the algorithm is polynomial both in n and in .     

The inverse gaussian distribution: Some properties and characterizations

This article presents some structural properties of the inverse Gaussian distribution, together with several new characterizations based on constancy of regression of suitable functions on the sum of n independent identically distributed random variables. A decomposition of the statistic λσ (X^?1_i?X^?1) into n - 1 independent chi-squared random variables, each with one degree of freedom, is given when n is of the form 2^r.     

关于中小企业集群持续创新的思考

一般而言,区域竞争力的源泉主要是来自两个方面低成本优势与持续创新能力。对于国内的大多数中小企业集群而言,低成本战略是其参与竞争的主要优势,但这种优势往往缺乏持续性。文章通过对国内中小企业集群创新的必要性与现状研究,论述了如何构建企业持续创新优势。     

pH法测定5-磺基水扬酸铜配合物的稳定常数

本文介绍pH法测定5-磺基水扬酸铜配合物的稳定常数实验的改进方法．     

丙烯酸乙酯皂化反应速率常数的测定

报道用电导法测定丙烯酸乙酯在不同温度和不同溶剂条件下皂化反应进程中电导的变化，从而分别求出各条件下的反应速率常数Ｋ。     

圆柱形波导中电磁波的传播损耗

由于电磁波传播空间的媒质不是理想介质，所以电磁波的传播过程总是伴随着能量的损耗，沿波导传输的电磁波也总是存在一定的电磁能量损耗。本文以无源空间波动方程为基础，推导出圆柱形波导中波的电场和磁场的场分量，以及波的击穿功率和衰减常数，由此得出减少圆柱形波导中电磁能量的传输损耗和提高传输效率的方法。     

碱对β-消除反应的影响

阐述了可变过渡态理论中关于碱对消除反应影响的研究结果.