An alternative gibbs-duhem method for the calculation of activities from the redox data for iron oxide in ternary oxide systems

An alternative approach is presented in this article for the calculation of the activity of FeO, Fe₂O₃, and the other component in ternary oxide slags when the redox behavior of iron oxides is known. The approach avoids the use of the “tangent intercepts” to the iso-oxygen activity curves as required in Schuhmann's method. Favorable comparisons were obtained for the systems of FeO-Fe₂O₃-CaO and FeO-Fe₂O₃-SiO₂ between the isoactivity curves derived using this method and those established in previous work using Schuhmann's method. Direct calculation of the free energy of mixing from the redox data is also possible. An example is given for the FeO-Fe₂O₂-CaO system.     

Modified atmosphere packaging of a mixed prepared vegetable salad dish

The aim of this study was to design a modified atmosphere package for a mixed vegetable salad consisting of 75 g of cut carrot, 55 g of cut cucumber, 20 g of sliced garlic and 50 g of whole green pepper. Respiration data of all the components were combined with film permeability data to predict package atmospheres and design optimal packages for experimental testing for improved shelf-life of the produce. The optimal package avoided minimum O₂ and maximum CO₂ tolerance limits, and chilling injury temperatures for any component. A pouch form package made of 27 mm low density polyethylene developed a modified atmosphere of 2.0–2.1% O₂ and 5.5–5.7% CO₂, which was beneficial for all components and provided better quality retention than other test packages.     

甜菜机械化栽培技术经济效果的分析

机械化栽培甜菜平均单产33.18吨/公顷,比人工栽培生产田提高52.03%;平均含糖15.5度,比人工栽培生产田提高1.09度;平均技术效果138.2元/公顷;经济效果1588.8元/公顷;创造社会经济效益24.47万元。     

棉铃宝高效液相色谱分析方法研究

本法采用同一色谱条件反相高效液相色谱法测定棉铃宝中甲基对硫磷和辛硫磷的含量，方法简单易行，具有较高的精密度和准确度，其回收率分析为甲基对硫磷９９．５９％，辛硫磷１０１．０％。     

米塔尔钢铁集团的全球并购发展战略

概述了米塔尔的并购经过和并购特点,着重探讨了米塔尔的管理模式、人员情况、钢铁厂布局、生产经营、主要战略伙伴、研发机构及其生产、采购与销售策略。系统地分析了米塔尔在中国的发展,指出米塔尔在全球钢铁业整合中处于领先地位,米塔尔来中国投资看中的是中国的原料和市场,且运作步伐明显加快,会对中国钢铁企业构成很大的威胁。     

粘土矿物对低渗透储层性质的影响——以鄂尔多斯盆地三叠系低渗透储层为例

粘土矿物是低渗砂岩储层的主要胶结物，对储层物性及开发过程中储层物性变化趋势有着重要的影响和控制作用。另外，粘土矿物也蕴含着大量沉积环境介质的物理化学信息，认识其自然规律，可以有效地指导预测有利储层，认识和改造油层。以鄂尔多斯盆地砂岩储层中的粘土矿物为研究对象，探讨分析粘土矿物对低渗储层性质的影响，该研究对含油气盆地低渗储层有效开发具有一定的参考价值。     

The Effects of Scaling and Bias Configuration on Operating-Voltage Constraints in SiGe HBTs for Mixed-Signal Circuits

This paper presents a comprehensive picture of operating-voltage constraints in SiGe heterojunction bipolar transistors, addressing breakdown-related issues as they relate to technology generation, bias configuration, and operating-current density. New definitions for breakdown voltage, adopted from standard measurements, are presented. Practical design implications and physical origins of breakdown are explored using calibrated 2-D simulations and quasi-3-D compact models. Device-level analysis of ac instabilities and power performance, which is relevant to mixed-signal circuit design, is presented, and implications of the relaxed voltage constraints for common-base operation are explored.     

热力学相图计算技术在闪速燃烧合成氮化硅铁中的应用

将热力学相图计算技术应用于Si-Fe-O-N体系,以评估由FeSi75粉闪速燃烧合成氮化硅铁的条件和目标产物。结果表明:将闪速燃烧温度控制在1200～1500℃之间较为适宜,此时平衡态产物中除主要含有Si3N4以外,还有一定量的Fe与Si间化合物和少量稳定的SiO2存在。此计算结果与实际试验结果吻合良好。     

Investigation of texture effect on visual colour difference evaluation

The texture effect on visual colour difference evaluation was investigated in this study. Five colour centers were selected and textured colour pairs were generated using scanned textile woven fabrics and colour‐mapping technique. The textured and solid colour pairs were then displayed on a characterized cathode ray tube (CRT) monitor for colour difference evaluation. The colour difference values for the pairs with texture patterns are equal to 5.0 CIELAB units in lightness direction. The texture level was represented by the half‐width of histogram, which is called texture strength in this study. High correlation was found between texture strength and visual colour difference for textured colour pairs, which indicates that an increasing of 10 units of texture strength in luminance would cause a decreasing of 0.25 units visual difference for the five colour centers. The ratio of visual difference between textured and solid colour pairs also indicates a high parametric effect of texture. © 2005 Wiley Periodicals, Inc. Col Res Appl, 30, 341–347, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/col.     

快乐女人的无“炎”夏日

盛夏时节，女人们裙摆飞扬，显得更加妩媚动人。然而，持续的高温湿热，妇科炎症也会乘虚而入。专家们认为，夏季之所以成为妇科炎症的高发季节，主要原因是天气闷热，特别是南方地区的湿度较大，更适宜某些致病细菌的生长；另外，中医认为夏季的“湿”容易降低女性的抵抗力；室外与空调房的过大温差，也容易使女性因免疫力不足而染病。下面介绍一些日常护理方法，帮助女性安然度夏。[编者按]