Generalized Marshall Olkin Inverse Lindley Distribution with Applications

In this article, a new generalization of the inverse Lindley distribution is introduced based on Marshall-Olkin family of distributions. We call the new distribution, the generalized Marshall-Olkin inverse Lindley distribution which offers more flexibility for modeling lifetime data. The new distribution includes the inverse Lindley and the Marshall-Olkin inverse Lindley as special distributions. Essential properties of the generalized Marshall-Olkin inverse Lindley distribution are discussed and investigated including, quantile function, ordinary moments, incomplete moments, moments of residual and stochastic ordering. Maximum likelihood method of estimation is considered under complete, Type-I censoring and Type-II censoring. Maximum likelihood estimators as well as approximate confidence intervals of the population parameters are discussed. A comprehensive simulation study is done to assess the performance of estimates based on their biases and mean square errors. The notability of the generalized Marshall-Olkin inverse Lindley model is clarified by means of two real data sets. The results showed the fact that the generalized Marshall-Olkin inverse Lindley model can produce better fits than power Lindley, extended Lindley, alpha power transmuted Lindley, alpha power extended exponential and Lindley distributions.     

Inverse design of the thermal environment in an airplane cockpit using the adjoint method with the momentum method

Currently, the thermal environment in airplane cockpits is unsatisfactory and pilots often complain about a strong draft sensation in the cockpit. It is caused by the unreasonable air supply diffusers design. One of the best approaches to design a better cockpit environment is the adjoint method. The method can simultaneously and efficiently identify the number, size, location, and shape of air supply inlets, and the air supply parameters. However, the real air diffuser needed to design often have grilles, especially in the airplane cockpit, and the current method can only design the inlet as an opening. This study combined the adjoint method with the momentum method to directly identify the optimal air supply diffusers with grilles to create optimal thermal environment in an airplane cockpit (1) under ideal conditions and (2) with realistic constraints. Under the ideal conditions, the resulting design provides an optimal thermal environment for the cockpit, but it might not be feasible in practice. The design with realistic constraints provides acceptable thermal comfort in the cockpit, but it is not optimal. Thus, there is an engineering trade-off between design feasibility and optimization. All in all, the adjoint method with the momentum method can be effectively used to identify real air supply diffusers.     

Impacts of slip and mass transpiration on Newtonian liquid flow over a porous stretching sheet

This article focuses on analytic solutions for Newtonian fluid flow with slip and mass transpiration on a porous stretching sheet using the differential transform method and Pade approximants of an exceptionally nonlinear differential equation. The impacts of different parameters including mass transpiration (suction/injection), Navier's slip, and Darcy number parameters on the velocity of the liquid and tangential stress are discussed. A comprehensive comparison of our results with the previous one in the literature is made, and the results showed good agreement. An investigation is conducted of a combination of magnetic liquids that are conceivably pertinent for wound medicines, skin repair, and astute coatings for natural gadgets. It is found that there is a decrease in the velocity profiles and the boundary layer thickness for the case of suction.     

综采工作面端头液压支架分析与合理选用

随着综采技术的发展,综采工作面端头顶板事故虽逐年减少,但事故率仍居高不下,改善综采工作面端头的支护状况,实现综采工作面高产高效和提高安全程度显得尤为重要,所以端头既是项板维护的重点,又是顶板管理的难点。     

气固流化床密度的在线测控研究

在对气固流化床选煤系统被控对象特性分析研究的基础上，提出用逆系统控制方法解决具有非线性多变量特点的气固流化床密度控制问题，建立了相关数学模型，介绍了流化床密度逆控制系统和方法，并获得较好的控制精度。     

工程评估理论及其在矿业中应用的新进展

我国矿业工程评估一般采用折现现金流量法，但由于矿业工程投资期间长，价格波动大，因而常低估矿业工程的投资价值，为此，介绍了近年来基于期权定价技术发展起来的矿业工程评估方法及其在矿业工程中的应用。     

基于期权的矿产资源采矿权估价单因素模型

矿产资源采矿权可以被认为是一个多期多阶段的复合看涨期权，在基于期权的采矿权价值形成机理研究基础上，假定无采矿权交易成本、不考虑关闭和开启矿山时的成本和矿山的永久性废弃以及利率为无风险利率，研究了矿产资源储量价值随机波动下的基于期权的矿产资源采矿权估价单因素模型，并结合一煤炭资源实例对比了收益现值法与单因素模型，发现期权估价方法较收益现值法能提高矿产资源采矿权价值。     

我国基础装备制造业改革发展的路如何才能走好？

本期呈现在读者面前的，就是本刊自本年3月开始，连续以多种方式向全行业人士包括用户单位征集的综述性论文专集．初衷是要在国家开始制订“十一五”发展规划之际，以我们的职责和能有的手段，力求从不同的方面和不同的角度，全面反映我国矿山机械行业的现状和大家对今后发展的建议，以供政府和企业参考，结果如何，现在呈现在这里，留给同志们去     

中国矿产资源产权改革的方向——市场化

矿产资源是自然资源的重要组成部分 ,是人类社会经济发展的重要物质基础。矿产资源是不可再生资源 ,因此应该高效合理地利用。随着我国市场经济体制的建立和完善 ,我国的矿产资源产权改革也应该适应市场经济体制的要求 ,走市场化的道路 :明晰产权关系 ,使矿产资源的所有权与经营权相分离 ,建立明晰的矿产资源产权关系 ;完善矿业权交易市场 ;完善立法 ,为矿产资源产权改革的市场化提供法律保障。     

对当前监理工作的认识

对当前监理工作存在的问题进行了分析,指出了监理工作的主要任务、监理单位的权利及当前监理工作应解决的问题。