HPLC法测量市售卫生球中萘的含量

萘是一种潜在的致癌物。市售卫生球中是否含有萘含量的受到越来越多人们的关注。本文以甲醇为流动相,用纯萘为标准物质,用HLPC法测定了在市场上随机购买的2种樟脑丸中萘的含量。结果表明,一种样品萘的含量较高。     

Automatic control system for uniformly paving iron ore pellets

In iron and steelmaking industry, iron ore pellet qualities are crucial to end-product properties, manufacturing costs and waste emissions. Uniform pellet pavements on the grate machine are a fundamental prerequisite to ensure even heat-transfer and pellet induration successively influences performance of the following metallurgical processes. This article presents an automatic control system for uniformly paving green pellets on the grate, via a mechanism mainly constituted of a mechanical linkage, a swinging belt, a conveyance belt and a grate. Mechanism analysis illustrates that uniform pellet pavements demand the frontend of the swinging belt oscillate at a constant angular velocity. Subsequently, kinetic models are formulated to relate oscillatory movements of the swinging belt’s frontend to rotations of a crank link driven by a motor. On basis of kinetic analysis of the pellet feeding mechanism, a cubic B-spline model is built for numerically computing discrete frequencies to be modulated during a motor rotation. Subsequently, the pellet feeding control system is presented in terms of compositional hardware and software components, and their functional relationships. Finally, pellet feeding experiments are carried out to demonstrate that the control system is effective, reliable and superior to conventional methods.     

硫酸烧渣生产球团的技术探讨

针对硫酸烧渣的特性和试验研究资料，分析探讨了利用硫酸烧渣生产氧化铁球团的的主要工艺技术。     

BTU芯块烧结炉控制系统技术改进

BTU炉在温度控制系统中,使用数字式电脑控制,其所用的PID控制参数使用工程整定法,整定过程较为复杂,且控制精度不是很高。而现在随着科学技术的进步,在许多场合都使用专用仪表的自适应PID控制,它不需要精确的数学模型,就可以自动计算PID参数值,极大的提升了控制精度。     

杨树叶颗粒饲料替代羊草饲喂公梅花鹿效果的研究

在大兴安岭兴安鹿业有限公司筛选了年龄4~7岁健康公梅花鹿（CervusNippon）200头随机分为两组,每组100头,采用单因子配对试验,一组夏季天饲喂杨树嫩枝叶,春秋和冬季饲喂杨树叶颗粒饲料,另外一组常年饲喂干羊草;经过两个完整的生物学周期试验,结果表明,在其他饲养条件相同的情况下,用杨树叶颗粒饲料替代羊草饲喂梅花鹿,成本低,适口性好,而且脱盘时间提前了半个月,产茸量提高了0．19kg,经济效益显著。     

云南高等级公路路基路面排水研究

实际调查表明,云南省高等级公路路面在使用一段时间后,出现各种病害,都不同程度地与地表水和地下水的侵蚀有关。如路基沉陷、坍塌、翻浆;沥青路面松散、剥落、龟裂;水泥混凝土路面唧泥、错台、断裂等。水的作用加剧路基路面结构损坏和路面使用性能的恶化。因此,做好道路的内部排水是影响路面使用性能和使用寿命的一个重要因素。     

手套箱在MOX燃料芯块制造实验线中的应用

作为放射性极强的乏燃料,MOX燃料芯块的制备过程需要进行严格的屏蔽处理。文章概括介绍了某工程中MOX燃料芯块的制备工艺及制造实验线中手套箱的设计应用。