废钢铁代用品

优质钢材的冶炼和高水平操作指标的获得需要优良的原料作保证。直接还原铁，碳化铁和脱碳粒铁作为废钢铁代用品，已显示出其价格和品质上的优越性，并弥补了废铁数量的不足，但因其各有自身的特点，故研究其理化性质和使用性能，将为大规模生产和使用创造必要的条件。     

Hydrolysis of Fe(OH)SO4 in the presence of metallic iron

Hydrolysis of Fe(OH)SO₄ was carried out in the presence of metallic iron in order to prevent the formation of iron(III) oxides with strongly bonded sulphate. Under the conditions of the experiment, the products were found to be mixtures of ?-Fe₂O₃ and α-FeOOH. The occluded sulphate, if any, could be easily washed out with water. The hydrolysis reaction passes through an equilibrium state before coming to completion. The entropy with enthalpy of the hydrolysis corresponding to the equilibrium state were found to be 4 e.u. and 0·5 kJ/mol, respectively. The activation energy of the hydrolysis reaction was found to be 21 kJ/mol.     

汽车发动机电机铁芯用钢(ADW2)的研制开发

鞍钢研制开发的汽车发动机启动电机用钢是针对汽车电机铁芯用钢（定、转子）而开发的电机钢类产品。介绍了该产品的研制过程及规格、特点。通过批量试制及装机试验，产品巳满足用户的使用要求。     

天津钢管公司DRC直接还原厂生产工艺与自动控制

天津钢管公司DRC直接还原厂将采用英国戴维国际工程公司的DRC煤基直接还原技术,以铁矿石、煤、石灰石为原燃料,用回转窑来生产直接还原铁(DRI)。该厂将由两条回转窑生产线组成,每条生产线的生产能力为15万tDRI/年,回转窑规格为φ5.0m×80m。工厂生产主线将采用计算机集散控制系统(DCS)以实现对生产过程的自动控制。     

Role of RE and Mg on Graphitization of Spheroidal Graphite Malleable Cast Iron

ＲｏｌｅｏｆＲＥａｎｄＭｇｏｎＧｒａｐｈｉｔｉｚａｔｉｏｎｏｆＳｐｈｅｒｏｉｄａｌＧｒａｐｈｉｔｅＭａｌｌｅａｂｌｅＣａｓｔＩｒｏｎ￥ＬｉｕＪｉｎ－Ｈａｉ（ＨｅｂｅｉＩｎｓｔｉｔｕｔｅｏｆＴｅｃｈｎｏｔｏｇｙ，Ｍｉａｎｊｉｎ３００１３０，Ｃｈｉｎａ）...     

Dynamics of hydrated iron(II) cations in nafion polymer membranes

Mössbauer studies of Fe²⁺ in water-soaked nafion polymer membranes in the temperature range between 90 K and 250 K have been performed. Above a critical temperature (～ 180 K) the spectra exhibit both elastic narrow absorption lines and quasielastic broad lines. These spectra are typical of bounded diffusion phenomena observed by Mössbauer spectroscopy in macromolecular systems like haemoglobin, myoglobin and ferritin. Similar spectral shapes have been observed by quasielastic neutron scattering from water in nafion membranes. Within 50 K above the critical temperature the total Mössbauer absorption area decreases by an order of magnitude whereas the narrow absorption line decreases by two orders of magnitude. The results are interpreted in terms of bounded diffusive motion of the iron. Using a model based on overdamped harmonically bound Brownian motion, the essential parameters of the iron motion can be derived as a function of temperature. The iron motion most probably reflects the motion of a large Fe²⁺ complex, e.g. Fe(H₂O)²⁺₆, which is attached to the polymer side chains via the sulphonic group.     

Influence of load and speed on wear characteristics of grey cast iron in dry sliding — selection for minimum wear

The wear of grey cast iron in dry sliding conditions has been studied with the aims of (1) finding the influence of working conditions on the wear rate, and (2) determining the region of speed and load where low wear is accomplished. Grey cast iron with flake and nodular graphite was submitted to investigation using a pin-on-disc machine. The results indicate that the flake graphite cast iron is more suitable for applications at speeds greater than 4 m s⁻¹ and lower loads, while nodular cast iron has greater wear resistance at lower speeds in the range of loads investigated - from 50 N cm⁻² to 200 N cm⁻²     

Effect of fermentation on ionizable iron in cereal-pulse combinations

The average diet in most developing countries is predominantly cereal based. Wheat, rice and millets are major staple foods. Although these diets are sufficient in iron, their low bioavailability is one of the most significant factors for iron deficiency anaemia. Traditional techniques like fermentation show promise in improving iron bioavailability. In vitro ionizable iron was estimated in 31 different combinations of rice, wheat, sorghum, black gram, bengal gram, green gram and coriander in five replicates with or without, fermentation in steamed products. Results indicate that in general cereal pulse combination and fermentation significantly ( P <0.05) increase the per cent ape of ionizable iron. Combination effects dominated in rice whilst fermentation dominated in sorghum. There was a significant reduction ( P <0.05) in phytate phosphorus on fermentation but no loss of tannin.     

PCR芯片和生化微分析系统

介绍了PCR微芯片的最新研究进展,给出了不同结构的PCR芯片设计原理以及特点,介绍由PCR芯片为主要单元的集成微全分析系统的相关研究,同时简要介绍了对PCR的仿真模拟等。     

数字式定温热偶真空计

本文介绍了一种新的数字式定温热偶真空计，它具有精度高、工作可靠、结构简单、操作方便等优点。文中具体阐述了微机系统的工作原理，并提供了结构原理框图。概述了研制中的关键技术问题，即用微机软件对非线性进行补偿的方法。最后介绍了该真空计的主要算法及应用实例。