[ecosistema urbano]

Polish architecture tutors and critics Roman Rutkowski and Lukasz Wojciechowski identify a new kind of architecture in [ecosistema urbano]'s ingenious temporary tower pavilions for a sterile new housing estate in Madrid. Contributing power to the local electricity grid, these towers are explicitly designed to provide shelter from the unmediated heat of the harsh external environment through their cooling effect and in so doing to stimulate communal activities and events. Copyright © 2009 John Wiley & Sons, Ltd.     

Treatment and restoration of used Mineral-Oil-Based hydraulic fluids from different machines. Part 1: Dewatering,filtration and effect of viscosity modifier

In this work, characterization and treatment of used hydraulic oil samples were performed in three steps. In the first step, the physical and the chemical properties of fresh and used hydraulic mineral oil samples from various centrifugal casting and pipe drawing machines were investigated according to ASTM D 6158. Results show that water content, solid particles count and depletion of additives have considerably affected most of the oil properties. Used oil samples failed in the appearance, thermal stability, oxidation stability, foaming tendency, water content and particles count.

In the second step, a simple methodology for dewatering and filtration was adopted. This methodology involved settling, followed by dry-air bubbling for oil dehydration and finally vacuum filtration. Such process successfully removed considerable portion of solid particles and water in used oil samples. Appearance, pour point, water content, particles count, and acid number were restored to the allowable limits. While water separability, oxidation stability, thermal stability and foaming tendency still failed the limits after treatment. It is obvious that additives will be needed to restore the latter properties.

In the third step, viscosity modifier additive was added to the oil samples to enhance viscous properties. A linear increase in kinematic viscosity was witnessed at 100°C, while at 40°C, an initial linear increase at low viscosities was followed by lower slopes at higher viscosities.     

一种新型铁矿用铲运机电缆的设计和制造

介绍了一种新型铁矿用铲运机电缆。电缆采用铜包钢线加强型导体结构和芳纶纤维编织加强护层结构,并采用了机械性能优异的聚氨酯弹性体护套材料,电缆的抗拉、抗弯曲、抗冲压、抗扭转,以及耐磨性能优异。电缆缆芯成缆后直接挤包内护套(无填充),增加了线芯的防滑移性能,提高了抗扭转性能。电缆使用寿命超过了6个月,满足铁矿用铲运机的使用要求,完全可替代同类型进口产品。     

动车组高速列车用6005A铝合金车体型材挤压工艺

为适应我国高速铁路发展的需要,开发了动车组高速列车用6005A铝合金车体型材,通过试验研究,优化了合金成分配比,确定了公司内部合金成分控制标准,优化了挤压工艺参数和模具设计、制造方案.生产出了内部组织和力学性能合格的高速列车用的6005A铝合金车体型材.     

包钢烧结母线通廊改造土建设计

随着包钢经济的发展,钢产量的提高,用电负荷大大增加,建于50年代末的母线通廊将被淘汰,取而代之的是电缆通廊。文章介绍了母线通廊改造为电缆通廊工程的土建设计及技术措施。     

面向顾客满意度的废旧机床再制造设计参数规划方法

基于目前大多数再制造机床仅注重机床本身性能的恢复,从未无法达到预期市场竞争力的问题,结合顾客需求和废旧机床再制造设计,构建了再制造设计参数决策框架,并充分考虑顾客需求与再制造设计参数之间的不确定性,应用模糊非线性回归法分析顾客需求与再制造设计参数之间以及不同再制造设计参数之间的模糊相关关系。同时,针对基于传统模糊非线性回归法的规划方程不具备处理模糊关系的能力,导致规划结果与实际情况偏离的情况,将模糊度融入规划方程,构建基于改进模糊非线性回归法的废旧机床再制造设计参数规划方程。以某机床再制造企业的废旧CAK6163的再制造设计过程为例,应用改进的再制造设计规划方程对其再制造设计参数进行规划。结果表明,由改进的规划方程得到的再制造设计参数,相对于传统规划方程,能够获得更高的顾客满意度,进而有效提升了再制造机床的市场竞争力。     

玻纤工业废耐火砖中铂铑金属微波碱熔活化-水溶酸浸富集工艺

采用微波碱熔活化-水溶酸浸富集工艺处理玻纤工业废耐火砖料,使其中的铂铑金属在酸浸渣中得以富集. 通过微波加热碱熔与常规加热碱熔对比实验,考察了碱熔温度、保温时间、配碱量对碱熔过程的影响. 结果表明,微波辐照温度800℃、保温时间30 min、碱熔剂NaOH为样品质量的1.4倍时,碱熔反应进行彻底. 熟料经水溶后,在最优条件下酸浸,在盐酸浓度3 mol/L、浸出时间5 min、酸料比15 mL/g的条件下,料浆过滤性能良好,出渣率2.98%,铂铑金属可富集约33倍.     

Accelerated Life Testing for a Class of Linear Hazard Rate Type Distributions

Accelerated life testing for distributions with hazard rate functions of the form r(t) = Ag(t) + Bh(t) are considered. Let V ₁, …, V _k be stress levels larger than V ₀—the stress level under normal conditions [V ₀ > 0]—and let a(v) be a nondecreasing function on (0, ∞). We discuss a generalization of the common accelerated models (the power rule model and the Arrhenius model) by assuming that the hazard rate under the stress level V, is of the form (a(V _t )) ^P (Ag(t) + Bh(t)). The maximum likelihood estimators of A, B and P for complete and censored samples are studied. The estimation procedure reduces to a solution of one equation with one unknown parameter. The estimation procedure under the assumption of aging is also described. The asymptotic variance-covariance matrix is given.     

既有砌体房屋改造大开间的结构设计

本文讨论了两类既有砌体房屋大开间改造工程--"墙承重改为梁承重"和"形成局部底部框架砖房"的设计,分析了结构计算的内容和设计方法,并提出了加固补强的途径.