非线性干燥机理模型中的一种参数估计法

研究了甩参数估计的方法确定颗粒状物料的质扩散系数。结果表明,这是一种简单、可靠和实用的方法。     

轴快流CO_2激光器放电管与风机匹配的特性

本文研究了轴快流CO_2激光器中气体质量流和气流速度随放电管截面变化的趋势.提出应当选择合适尺寸的放电管,使之与所给定的风机的性能相匹配,使激光器具有最佳运行状态的气动结构而获得更好的输出特性.     

Role of Ferrel cell in daily variability of Northern Hemisphere Annular Mode

The Northern Hemisphere Annular Mode(NAM) represents the zonally symmetric planetary-scale atmospheric mass fluctuations between middle and high latitudes, whose variations have shown a large impact on other components of the climate system. Previous studies have indicated that the NAM is correlated with the Ferrel cell in their monthly or longer timescale variability.However, there have been few studies investigating their connections at daily timescale, though daily variability of NAM has been suggested to be an important component and has significant implication for weather forecast. The results from this study demonstrate that variability of the Ferrel cell leads that of the NAM by about 1–2 days. This statistically identified temporal phase difference between NAM and Ferrel cell variability can be elucidated by meridional mass redistribution. Intensified(weakened)Ferrel cell causes anomalously smaller(larger) poleward mass transport from the middle to the high latitudes,resulting in an increase(a decrease) in mass in the middle latitudes and a decrease(an increase) in the high latitudes.As a consequence, anomalously higher(lower) poleward pressure gradient forms and the NAM subsequently shifts to a positive(negative) phase at a time lag of 1–2 days. The findings here would augment the existing knowledge for better understanding the connection between the Ferrel Cell and the NAM, and may provide skillful information for improving NAM as well as daily scale weather prediction.     

大体积混凝土施工缝的设置

根据莱钢冷轧薄板轧机基础施工实例,介绍了施工缝的设置原则及方法,阐述了施工缝的处理方法及施工中的注意事项,施工结果显示其效果良好,总结了后浇带、施工缝分段法浇筑的施工经验。     

贴近群众才能赢得听众--浅谈广播记者的群众观念

广播电台新闻记者，只有强化群众观念，走好群众路线，把握群众生活，倾情为群众服务，才能帖近群众，才能赢得听众。     

轨道交通干式变压器安装工艺研究

本文介绍了深圳轨道交通3号线二期工程供电系统中牵引变压器和降压变压器设置情况．分析了干式电力变压器的特点及城市轨道交通变电场所相对窄小等情况,研究了干式变压器的安装工艺,来保证工期的顺利完成。     

有机质谱解析系统的初步研究

本文介绍了利用计算机解析有机质谱方法的初步研究,并用相应的实验数据进行验证,结果比较满意.     

Postponement in Mass Customization: A Literature Review

Mass customization (MC) is emerging as a competitive advantage of firms with the intensified competition and economic globalization. As a key feature of MC, postponement strategy postpones activities in the supply chain until customer orders are received. This article provides a review of the literature on postponement from perspectives of research content and methodology. Taking postponement as a supply chain concept, this article specifically reclassifies the postponement applications according to the positioning of the customer order decoupling point (CODP) in the supply chain. Future directions for postponement research are also suggested in this article.     

化石、矿物和岩石样品的Sm—Nd同位素实验方法研究及其应用

本文详细介绍了化石、矿物和岩石样品中Sm—Nd同位素化学制备与质谱测定实验技术。样品采用Teflon密闭熔样法,用阳离子交换程序分离Sm和Nd。采用钽/铼三灯丝和多接受技术在VG354质谱计上以Sm~+和Nd~+形式测定Sm和Nd。Nd同位素比值以 ~(146)Nd/~(144)Nd=0.7219为标准化值。对BCR—1岩石标样测定为~(143)Nd/~(144)Nd=0.512662±8(2σ_m)。Nd全流程本底为5—7×10~(-11)克。采用上述实验方法研究了中国大阳岔国际寒武/奥陶系界线候选层型剖面中古生物化石 Sm—Nd同位素体系,取得了可靠的数据和有意义的地质结论。     

基于SL811的嵌入式USB主机设计

介绍了使用SL811作为接口芯片的USB主机的设计方法。系统抛开了PC机,把USB主机引入到嵌入式系统中,拓展了USB的应用领域。着重论述USB主机协议栈的分层结构,并对几个底层驱动函数的功能给予了详细的注释,最后给出了系统的实测数据。文中涉及的驱动程序代码绝大部分与硬件无关,对于不同的微处理器和USB接口芯片只需更改最底层的驱动函数,因而更具有可移植性。