低阶煤O2/CO2气氛下燃烧生成颗粒物的特性

选取了2种低阶煤在不同气氛下沉降炉中进行燃烧实验,产生的灰颗收集到粒旋风分离器和低压冲击器中,利用透射电子显微镜和扫描电镜分析亚微米颗粒和超微米颗粒的形态,利用扫描电镜能量色散谱仪联用,透射电子显微镜能量色散谱仪联用和计算机控制的扫描电镜分析灰颗粒的化学元素组成。研究结果表明:O2/CO2燃烧改变超细颗粒物的大小分布和灰中元素的浓度分布,但没有改变细颗粒的生成机制。对于含有更多有机结构矿物质的褐煤,O2/CO2燃烧提高了Fe、Na/K、Al和Si的气化程度,也因此增加了亚微颗粒的浓度,而且褐煤中的Fe元素的气化较为特殊,O2/CO2燃烧氧气浓度的增加提高了Fe气化后在其他粒子上的附着。     

电流型脉宽调制整流器间接电流控制改进策略

针对传统三相电流型脉宽调制整流器间接电流控制存在受主电路参数 L、 C 变化影响大使得系统精度得不到提高的问题,采用间接电流控制改进策略,在每相调制信号中引入延时角,使得控制得到简化,系统精度得到改善.通过对电动汽车用磷酸铁锂动力电池组进行相关充电实验,验证了该控制策略的可行性和合理性     

数字信号处理器（DSP）在脉冲压缩中的应用研究

讨论数字信号处理器在雷达脉冲压技术中的应用。在分析雷达数字脉冲压缩技术的基础上,分别给出通用ＤＳＰ和专用ＤＳＰ实现脉冲压缩系统的方案。讨论这两种方案中ＤＳＰ的应用结构及其优缺点,并给出脉压系统选用ＤＳＰ的依据,并介绍目前可以应用于雷达冲压压缩系统的通用及专用ＤＳＰ芯片。     

Effects of coal blending on the reduction of PM10 during high-temperature combustion 2. A coalescence-fragmentation model

A coalescence-fragmentation model has been developed to predict the behaviors of coal mineral particles during the combustion of pulverized bituminous coals or coal blends. Based on the computer-controlled scanning electron microscope (CCSEM) characterization of coal minerals, the particle size distributions (PSDs) and mineral species of ash particles can be simulated. In particular, the interactions among excluded minerals (mainly referring to the excluded Ca-bearing-species and Fe-bearing-species) and included minerals are accounted for in this model. The PSDs and the mineral species of ash particles are derived from the coalescence and fragmentation of coal mineral particles. Based on this proposed model, both of the predicted PSDs and the mineral species of ash particles are in good agreement with their corresponding experimentally measured values. And the comparisons further demonstrate that the combined effects of coalescence of included minerals and fragmentation of excluded minerals have direct impacts on the ash-forming process. In addition, for the coals rich in excluded Ca- and/or Fe-bearing-species, the interactions among included minerals and excluded minerals are another important mechanism governing ash formation for high-rank coals.     

奶油香精微胶囊研究

用喷雾干燥法对奶油香精微胶囊化进行了研究，探索了工艺条件，对微胶囊壁材进行了选择。     

大连大有恬园

当今,随着我国经济高速发展,生态环境日益恶化,可利用资源渐趋萎缩,住宅设计不再简单地追求遮风雨、避严寒的功能性,而是强调在保护水体、土地、能源、环境、材料、环保等方面运用可持续发展技术,以减少能源消耗和资源浪费,建设美观、和谐的可持续建筑。大有恬园位于大连西部     

假设检验在尿素单包平均净重分析中的应用

介绍应用假设检验对尿素单包平均净重进行判定的方法和步骤，并归纳介绍了假设检验的适用场合以及如何进行统计量的选择。     

硼在研究古沉积环境中的作用

五十年代后期以来,研究微量元素地球化学相标志,用以说明沉积环境的工作日益受到重视,发表的文章越来越多。从已有的资料和我们自己的经验看,硼在研究盆地水介质含盐度的变化方面是一个较有效的标志。本文以江汉盆地潜江凹陷白垩-第三系硼的地球化学研究成果为例,进一步探讨硼在研究沉积环境和评价生油岩中的作用。在探讨之前首先介绍一下样品的处理和分析方法。     

Effect of Tantalum Content on Creep Properties of CLAM Steel

This paper presents the results of an experimental study about the effect of tantalum content on the creep properties of China low activation martensitic steel. Four heats of the steel with tantalum content ranging from 0.027 to 0.18 wt% have been fabricated and the creep tests have been carried out at 550 °C over a stress range of 230–240 MPa. The results indicated that the elevation of tantalum content caused an obvious increase in the rupture time of one order of magnitude and a dramatically decrease in creep rate for one order of magnitude. Both the creep rupture time and minimum creep rate revealed good linear relationships versus tantalum content on log–log scale, and empirical models were built up. The improvement of creep properties could be attribute to the change of microstructure caused by the increase of tantalum content. The microstructure observation indicated that the average grain size of the prior austenite decreased and the precipitation of Ta-riched MX was promoted with the addition of tantalum.     

实现CDMA最佳多用户检测的神经网络方法

提出并讨论了两种实现码分多址系统中最佳多用户检测的神经网络方法。一种基于离散Ｈｏｐｆｉｅｌｄ神经网络，另一种基于采用反向传播算法的多层感知器神经网络。理论分析和计算机模拟都证实了这两种神经网络方法的可行性，优越性和实用性。前者适用“固定”用户情况；后者既可用于“固定”用户吼适用于移动用户的情况，因而在未来的ＣＤＭＡ个人通信网中有较好的应用前景。