住宅厨房共用排烟系统性能比较

介绍了当地住宅厨房通风设计的发展简况，比较了两种房共用排烟系统的构造，尺寸，性能，造价及能耗，对厨房通风设计和施工提出了建议。     

A novel laboratory bench for practical evaluation of catalysts useful for simultaneous conversion of NOx and soot in diesel exhaust

This study deals with the development of a laboratory bench for the practical evaluation of catalysts that are useful for the direct conversion of NO_x and soot in the exhaust of diesel engines. The employed model exhaust is generated by using a diffusion burner with additionally dosing some gaseous components to the burner gas to obtain a realistic feed composition. The produced soot is extensively characterized by employing thermogravimetry, transmission electron microscopy, N₂ physisorption and temperature programmed techniques. The results of the different characterization methods show that the present soot is suitable for the intended catalytic investigations. The simultaneous conversion of NO_x and soot is examined like in practice, i.e. the soot is separated from the tail gas by a diesel particulate filter (DPF) that is coated with the catalyst. The deposited soot is then catalytically converted by NO_x and O₂ to form N₂ and CO₂. The conversions of NO_x and soot are measured by exclusively applying gas analysers, whereby a special experimental procedure is developed to determine the soot removal. Hence, additional soot related analytics are not required. To show the suitability of the constructed bench a Pt/Fe₂O₃/β-zeolite sample is taken as test catalyst that is reported to be very active in NO_x/soot reaction. The measurements performed with and without catalyst clearly show the effect of the used sample in simultaneous NO_x/soot conversion. We therefore consider the constructed laboratory bench to be a useful tool for testing and ranking catalytic materials.     

制氢尾气二氧化碳回收装置设计

对制氢尾气二氧化碳的回收装置进行了简捷设计，流程分析，并对换热装置的换热量和传热面积给出了算法和有关数据。     

排气管偏置对PV型旋风分离器性能影响的研究

以Ф300mm、标准PV型旋风分离器为基准模型进行冷态对比实验，研究了排气管与筒体轴线偏心布置对PV型旋风分离器分离性能的影响。结果表明，排气管偏置是进一步提高PV型旋风分离器性能的有效措施之一。在适当的偏心矩和偏置方位下，不仅能降低压降，还可以显著提高分离效率。     

ON THE SLOW MANIFOLD CHARACTERISTICS OF CAPILLARY SUCTION APPARATUS DYNAMICS

The nonlinear dynamic behaviour relating the wet front size and liquid saturation under inner cylinder (or rectangular cell) in cylindrical (or rectangular) capillary suction apparatus was investigated. The slow manifold explanation was proposed and the fast- and slow-varying variables were identified. Experiments were conducted to verify theoretical findings.     

金选别工艺的发展与深化

本文阐述了充分考虑矿石性质,探索出混合浮选的分步流程,恰当的施用多元扑收剂所产出的“协同效应”,稳定和强化选别工艺,收到提高选金技术指标的效果。     

黄金冶炼厂污染源治理技术

本文阐述了采用加温加压无氰解吸、金电解精炼，活性炭酸洗、火法再生产工艺，所产生污染物的治理技术。     

Axial characterization of catalytic activity in close-coupled lightoff and underfloor catalytic converters

A exhaust system consisting of a close-coupled Pd technology 32 in³ lightoff converter and Pt/Rh technology 170 in³ underfloor converter was vehicle-aged for 56000 miles on a vehicle equipped with a 3.8 l engine. Following this aging, the converters were taken off the vehicle and cut into 1″ thick sections along their axis and characterized for lightoff and warmed-up activity using a laboratory reactor to simulate vehicle exhaust. Each section was also analyzed for the quantity of oil additive poisons (phosphorus and zinc) deposited. Following this initial characterization, the phosphorus and zinc deposits were removed, and the sections were characterized again for lightoff and warmed-up activity. This procedure was used to qualitatively determine the relative contribution of oil additive poisoning and thermal sintering to the total activity deterioration as a function of axial position in the catalyst monoliths.

Analysis of the lightoff converter as taken from the vehicle showed a dramatic axial gradient in the lean and stoichiometric lightoff and warmed-up (600°C) performance for HC, CO and NO_x, with most of the deterioration having taken place in the forward-most 1″ section of the converter, which was consistent with the gradient in the deposition of phosphorus (P) and zinc (Zn) in this converter. Comparison of these data sets with those obtained after removal of the P and Zn poisons indicates that most of the total deterioration of lean HC and CO activity can be attributed to P and Zn poisoning of the forwardmost 1″ section. When tested under stoichiometric conditions, most of the deterioration of HC activity is attributable to P and Zn poisoning, while most of the deterioration of CO and NO_x activity is attributable to thermal deterioration. A similar activity and poison deposition gradient was detected in the underfloor converter, but to a smaller extent.     

一种基于压缩感知的邻域优化算法

非线性降维方法是目前对降维研究有着重要影响的方法,但在降维过程中经常会遇到局部邻域信息量不足、短路和噪声干扰等问题,严重影响降维效果,很难广泛应用于真实数据的处理中.对以上问题分析发现,其主要原因在于经典降维算法都是采用全局固定的邻域大小.提出了一种基于压缩感知的邻域优化算法,运用压缩感知技术对高维空间目标点近邻进行压缩采样,构建“收—放”模型,自适应得到最优子空间,同时优化邻域组成元素,使得数据的整体降维效果更加稳定.通过手工流形和真实数据集的实验,验证了算法的有效性和稳定性.     

一种基于局部保持的子流形可视化方法

针对多数流形学习算法是基于单一流形的假设,当高维数据集中存在多个流形,流形学习算法可视化效果差问题,借鉴流形曲面在二维平面空间展开的思想提出基于局部保持的的子流形可视化方法。利用奇异值分解和k均值聚类方法将流形数据划分为多块子流形,计算第一流形切块中心与其余切块中心的拓扑结构关系,在目标低维空间保持上述中心间拓扑结构下逐一对流形切块投影展开,最后在人脸数据集上进行实验。实验结果表明:该方法较好保持了子流形内的数据间的拓扑结构。