平均不等式有趣应用几例

介绍了平均不等式在数学证明中的几例有趣应用。     

低风温条件下高炉喷煤冶炼工艺研究

传统配煤理论认为,风温低于900℃时,高炉须停止喷煤冶炼,改为全焦冶炼。2006年12月10日,我厂2#高炉热风炉组进行为期3个月的计划检修,平均风温水平仅有600~700℃,铁水成本压力大。为此,我们通过控制促进煤粉燃烧的几个关键参数,在喷煤比60~70 kg/tFe的条件下,炉况顺行,产量稳定。     

Ku频段卫星电视的接收

1 亚太地区上空的我国卫星电视我国中央电视台已于1996年8月15日起,通过亚洲2号和亚太1A 卫星开始转发中央电视台第1套～第8套节目。原来通过     

新型墙体材料缘何难以推广

我国从60年代开始进行墙体材料革新工作,经过30多年的发展,目前我国墙体材料中80%仍是     

智能结构系统中的光纤传感技术

智能结构系统具有类似人体运动控制功能，埋置在工程结构或材料中便能获得顺应环境变化的自判断性、自适应性、自诊断性、自修复性等诸多性能。这一神奇的科学技术具有重大科学意义和广阔的应用前景。利用特性优良的光纤传感器可以构成一种特殊的光纤智能结构系统。本文较深入介绍适合智能结构系统的光纤多点式和分布式传感技术的原理、结构和实施方法。     

校园网络安全应急响应联动系统模型

网络安全应急响应联动系统的目的是充分协调地理上分布的资源,共同应对网络安全事件。以目前的应急响应技术为基础,结合校园网络安全的应急响应实践,建立了校园网络安全应急响应联动系统模型,分析了联动系统的体系结构、功能结构和安全策略。     

Effect of breed-type on the relationships between intramuscular and total body fat in steers

The partitioning of total dissectible body fat and the amounts of intramuscular fat in Psoas major, Semitendinosus and Biceps brachii muscles were determined in two groups of A. Angus and AA × Nelore steers with similar averages of total dissectible fat (27·7 kg). In addition, the fatty acid composition of total fat and the triglyceride fraction from dissectible and intramuscular fats were determined.

The AA × Nelore steers have higher levels of subcutaneous fat and lower levels of intermuscular fat than the A. Angus but contain lower levels of intramuscular fat in the three muscles. The allometric regressions varied according to the muscle and breed type. The fatty acid composition of subcutaneous and kidney fats were similar but differences in the percentages of 14:0, 18:0, 18:2 and 20:4 fatty acids in intramuscular fats between the two genetic groups were detected.     

A comparison of distribution and composition of intramuscular fat in Duroc Jersey and Hampshire pigs at 100 kg liveweight

The intramuscular fat content, its fatty acid composition and that from the triglyceride fraction, were determined in several muscles from the right sides of four Duroc Jersey and four Hampshire castrated male pigs slaughtered at 100 kg liveweight. The Hampshires had heavier muscles than the Duroc Jersey pigs, but did not show significant differences in the percentages of intramuscular fat. The concentrations of linoleic acid were, in general, higher in the Hampshire than in the Duroc Jersey pigs and in many muscles the differences were highly significant (p < 0·05) The concentrations of linoleic acid (18:2) in the triglyceride fraction did not differ among muscles within breeds but were higher in Hampshire than in Duroc Jersey pigs.