强对流间歇式炉热工特征的研究

针对使用高速燃烧器的间歇式热处理炉,进行了在高速气流循环下的炉内热交换机构与特征的试验研究,得到了传给堆料金属总热流、对流热流以及辐射热流随加热进程的变化规律。根据实验与计算结果,还揭示了金属辐射反向热流是强对流间歇式炉内不可避免的新型传热特征。     

羊毛毛条活性染料冷轧汽蒸染色方法初探

本文介绍了羊毛毛条活性染料冷轧汽蒸染色方法；讨论了该染色法快速上染的机理，并建立了染色模型。     

Synthesis and characterization of 2, 4-dihydroxy-benzaldehydeoxime-formaldehyde polymers and their application as ion-exchangers

Polymers were prepared by the condensation of 2, 4-dihydroxybenzaldehydeoxime (2, 4-DBO) and formaldehyde (F) in the presence of oxalic acid as catalyst with varying molar ratios of reacting monomers. Polymers were characterized by their IR spectra, elemental analyses, TGA and M_n as determined by vapour pressure osmometry as well as by non-aqueous conductometric titrations. Viscosity measurements of the solutions of polymer samples were carried out in dimethylformamide. Chelation ion-exchange properties have also been studied employing the batch equilibration method. This method involved the measurement of distribution of a given metal between the polymer sample and a solution containing metal ions. The study was carried out over a wide pH range and in media of various ionic strengths. The polymer showed a higher selectivity for UO ₂ ²⁺ and Fe³⁺ ions than for Cu²⁺, Ni²⁺, Co²⁺ and Mn²⁺ ions.     

Production of antitumoral retamycin during fed-batch fermentations of Streptomyces olindensis

Fed-batch runs were performed in order to correlate the production of retamycin, an anthracycline antibiotic produced by Streptomyces olindensis in submerged cultures, with the specific growth rate. Maximum retamycin production was achieved with an exponential feed rate, controlling the specific growth rate at a low value (0.03h⁻¹, about 10% of the maximum specific growth rate). Control of the specific growth rate at higher values (0.10 and 0.17 h⁻¹) caused a decrease in antibiotic production. Morphology, assessed by image analysis, was shown to be highly relevant in this process. Cell growth mainly in the form of clumps (90% clumps and 10% free filaments) led to better results than growth as clumps (75%) and free filaments (25%).     

煤的超临界醇萃取脱硫：Ⅰ.间歇式反应器实验结果

本文采用１００ｍｌ间歇式反应器对难脱硫的高变质焦煤进行了超临界醇萃取脱硫的研究。考察了反应温度、萃取时间、醇／煤比对脱硫的影响，并研究了有机硫煤样的脱除规律，比较了甲醇、乙醇脱硫效果的差异。结果表明：随反应温度的升高，脱硫率增加，在４００℃，５０ｍｉｎ时发生硫的再吸收而导致脱硫率下降；随醇／煤比增加脱硫率上升，其主要原因是醇／煤比增大有利于化学键的断裂。从脱除有机硫的角度而言，没有必要先用ＨＮＯ＿３处理煤样；甲醇、乙醇的脱硫效果相差不大，气相产物中ＣＨ＿４、Ｃ＿２Ｈ＿６的含量取决于所使用溶剂的种类。     

Xylose reductase activity of Candida guilliermondii during xylitol production by fed-batch fermentation

Xylose reductase activity of Candida guilliermondii FTI 20037 was evaluated during xylitol production by fed-batch fermentation of sugarcane bagasse hydrolysate. A 2^4-1 fractional factorial design was used to select process variables. The xylose concentrations in the feeding solution (S _F ) and in the fermentor (S ₀), the pH, and the aeration rate were selected for optimization of this process, which will be undertaken in the near future. The best experimental result was achieved at S _F =45 g/L, S ₀=40 g/L, pH controlled at 6.0, and aeration rate of 1.2 vvm. Under these conditions, the xylose reductase activity was 0.81 U/mg of protein and xylitol production was 26.3 g/L, corresponding to a volumetric productivity of 0.55 g/(L·h) and a xylose xylitol yield factor of 0.68 g/g.     

批量判定点位是否在区域内的原理及实现

介绍了基于VisualBasic语言编程在测绘工作中大批量判定点位归属哪个区域的原理及实现方法。通过批量处理数据,能够快速、准确地实现任务,可以减少人工错误,值得推广。     

装饰项目管理工厂化可行性分析

通过对传统装饰施工的顶面、墙面、地面施工的各环节的细部工作的工厂化生产和现场总装模式的论证,阐述了在施工环节中可行性.列举了装饰现场深化设计在现场预计可能发生的隐患,并指出避免办法.就如何推行装饰工厂化发展,从目标、执行过程当中的资金、人才、信息收集归纳、设备信息化管理等方面进行了讨论.在上述论证基础上,得出基层统筹总装施工模式一定会成为建筑装饰行业中的主流,建筑装饰工地将变成一个总装车间.     

工件有尺寸的同型机分批排序问题

首次研究了工件有尺寸的同型机分批排序问题,用3元素法将其表示为,pm│B,sj│Cmax,并对这一问题给出了一个近似比为5/2-1/m的离线算法.     

Nonlinear Frequency Response of Nonisothermal Adsorption Systems

A general method for the investigation of adsorption kinetics of nonlinear,nonisothermal systems, based on frequency response analysis, ispresented. It is based on the definition of higher-order frequency response functions (FRFs) on the adsorber and on the particle level. FRFs on the adsorber level can be estimated from experimentally measuredadsorber FR and used to calculate FRFs on the particle level,which can be further used for model identification, by comparison withtheoretical particle FRFs. The general procedure for calculation of particle FRFs from those of adsorber is given. Also, the generalprocedure for theoretical derivation of particle FRFs is given andillustrated with an example of nonisothermal adsorption governed bymicropore diffusion and film resistance heat transfer, as well as theprocedure for calculating unmeasured adsorber FRFs, which isillustrated with an example of a batch adsorber with volume modulation.