硅线石莫来石化材料在液态模锻模具中的应用

将硅线石莫来石化材料用于制作液态模锻模具中的凹模,并进行了铝合金液态模锻试验。尽管在实际比压值未达到材料的许用比压值时,凹模即遭到破坏,但所获得的铝合金制件表观良好,这说明用硅线石莫来石化材料。作为液态模锻的模具材料是可行的。在试验结果的基础上,对试验中的不足进行了认真地分析,并提出了具体的解决措施。     

Heat exchanger network area targeting considering stream allocation to shell or tubes

An optimal heat recovery network requires optimum values of area and energy targets. Current heat exchanger network targeting methods do not consider the optimal allocation of each stream to shell or tube side of the exchanger during the network cost estimation. Some researchers pre-set the allocation of the streams ahead of targeting [Polley, G. T., & Panjeh Shahi, M. H. (1991). Interfacing heat exchanger network synthesis and detailed heat exchanger design. Transactions of the Institute of Chemical Engineers, 69(Part A), 445–457]. In real design case however, some practical considerations such as fouling and corrosion constrain the allocation of streams. Apart from those, other streams are allowed to be allocated to either tubes or shell. Appropriate allocation of these streams can considerably affect the network cost estimation. This paper introduces a new area-targeting procedure which utilizes the optimal allocation of streams in all enthalpy intervals. The procedure evaluates two possible options for each stream split passing through each exchanger in the spaghetti network. Thus, two different exchanger area requirements can be estimated and the one with less area requirement will be selected. During this evaluation process, the optimal distribution of each stream pressure drop within enthalpy intervals is fully utilized. The proposed targeting procedure is applied on a case study and comparison of the results with previous method (Polley & Panjeh Shahi, 1991) shows reduction of around 18% in the network area. In another case study, the area–energy trade offs using the new procedure shows a reduction of 12.4% in minimum network area requirement and 14.5% in total annual cost. Therefore, the new procedure can considerably alter the area–energy trade offs.     

通南巴地区上二叠统长兴组储层特征及预测

川东北地区大量发育较好的海相碳酸盐岩储层,而海相碳酸盐岩储层在发育及油气成藏等方面表现复杂。本文通过野外调查,以蟠龙洞、通江铁厂河和羊鼓洞地区长兴组典型生物礁露头为代表并结合室内研究,在以往研究的基础之上结合现有地震资料得出长兴组沉积模式和沉积体系,认为长兴组为台盆对称沉积模式,主要发育台缘礁滩沉积体系、开阔台地（缓坡）沉积体系、浅滩一蒸发坪及盆地沉积体系,且通南巴地区广泛存在台地边缘礁滩相带,进而对长兴组储层区域进行了预测。     

Comparison of Mass Transfer Efficiency and Energy Consumption in Static Mixers

The aim of this study was to compare the pressure drop (Δp) generated by a static mixer with sieve plates in two-phase downflow (water as a continuous phase), and the mass transfer efficiency (k_La, a) with the performance of other static mixers (Sulzer, Kenics, Karman, etc.). The relationships for Δp, k_La and interfacial area (a) calculation depending on liquid and gas phase velocities and geometry of the plates (sieves) in this static mixer are presented. k_La was found to be strictly proportional to the power consumption (P/V) and its values were quite close to those obtained in Sulzer & Kenics mixers with an 8-element mesh. Enhancement factors for oxygen absorption in the sodium sulphite solution and for ozone absorption in Lake Ülemiste water were calculated and the plausible values of the interfacial area (a) were estimated.     

MnO_2活性的评价方法

国内外对MnO_2活性评价有很多方法,本文介绍一种用锌离子吸附法(ZIA法)来测定MnO_2比表面,从而可以评价不同产地MnO_2活性大小。MnO_2比表面越大,则其活性越大。通过测比表面,可以判断某活性大小,ZIA法比BET法简单。优越。     

Effect of GDC interlayer thickness on durability of solid oxide fuel cell cathode

Long-term performance degradation of solid oxide fuel cell (SOFC) cathode as a function of gadolinium doped ceria (GDC) interlayer thickness has been studied under accelerated operating conditions. For this purpose, SOFC half-cells with GDC interlayer thicknesses of 2.4, 3.4 and 6.0 µm were fabricated and tested for 1000 h at 900 °C under constant current density of 1 A/cm². The half-cells consisted of lanthanum strontium cobalt ferrite (LSCF)/GDC composite cathode, GDC interlayer, scandia-ceria stabilized zirconia electrolyte and platinum anode as a counter electrode. Area specific resistance (ASR) of the half-cells was continuously measured over time. Higher increase in ASR was observed for the half-cells with GDC interlayer thickness of 2.4 and 6.0 µm, which is attributed to higher strontium (Sr) diffusion towards electrolyte and to cathode/GDC interface delamination coupled with small Sr diffusion, respectively. However, half-cell with GDC interlayer thickness of 3.4 µm showed smaller degradation rate due to highly dense GDC interlayer which had less interfacial resistance and suppressed Sr diffusion towards electrolyte.     

临钢板坯三角区裂纹的形成因素及控制

通过对临钢板坯产生三角区裂纹试样的分析,从生产工艺、设备等方面分析得出结晶器锥度、铸机开口度、钢中S含量、拉速以及浇注温度等因素是影响当前三角区裂纹的主要原因,并针对上述影响因素提出相应的控制措施。     

有色金属铸件浇注系统最小截面积计算公式探讨

阐述了有色金属铸件（重力铸造）生产中，计算浇注系统最小截面积的常用公式之特点和存在的不足，分析了这公式共同存在的使用前提不明、适用范围窄、通用性差等缺点，介绍了一种用统计学方法回归推算出的适用范围宽，操作简便快捷、实用性强的有色金属铸件浇注系统最小截面积（∑F阻）的计算公式，并对其与近十几年来众多成功的生产实例进行了比照。     

供暖网络的节能措施——计算机实时控制系统

供暖系统运行的能耗在物业管理成本中占份额较大,是经营盈亏的重要控制点。本文通过对实际运行中记录的大量资料进行分析,针对传统的供暖系统运行方式的缺陷,旨在为提高能源的转换效率,最大限度地降低运行成本,提出了用计算机分区域、分时段、分换热方式和分温度梯度等实时变频控制的全新系统控制理论。     

汉字识别系统中的版面分析算法

本文在简要介绍版面分析技术发展状况和常见版面分析技术路线的基础上，提出了一种将“自底向上”与“自顶向下”分析路线相结合的版面分析算法。