基于主动段状态估计的弹道估计方法研究

在不具备目标先验信息的情况下，提出了采用基于主动段运动状态估计外推弹道参数的方法，完成对弹道导弹目标的弹道估计和落点预报任务．仿真结果表明，该方法脱离了弹道模板的制约，能够得到比较好的估计结果，具有一定的实用性和研究价值．     

耐磨可塑料在循环流化床锅炉中的应用

循环流化床锅炉运行时,其旋风分离器的进口和内壁磨损严重。为了减少磨损,增加旋风分离器的使用寿命,在旋风分离器的进口和内壁敷设一层耐磨可塑料。经实际使用对比表明,耐磨可塑料在耐火度、永久线变化率和抗磨性等方面都优于传统的防磨浇注料,而且耐磨可塑料敷设简单,维修方便,可以大大降低施工和维修费用,提高经济效益。因此,耐磨可塑料值得推广应用。     

非高斯噪声下基于Unscented粒子滤波器的非线性系统故障诊断方法

非高斯噪声下非线性系统的故障诊断中,一般是基于粒子滤波器的方法,但普通粒子滤波器通常会发生“退化”现象,严重影响故障的检测和诊断品质。本文通过引入Unscented粒子滤波器方法,利用Unscented变换对随机分布的非线性概率传递能力来产生建议分布,能明显地改善普通粒子滤波器的性能;然后,提出了基于该滤波器的序贯式故障诊断策略,采用负对数似然比方法监控系统的运行状态,故障发后利用状态联合估计器进行故障隔离。计算实例表明,该新方法能实时检测诊断出非线性系统的故障,同时能抑制非高斯噪声的影响。     

固定化酵母薯干原料酒精发酵中试研究

本文论述了固定化酵母薯干原料带渣酒精发酵的中试结果。中试生物反应器容积为１０００Ｌ，采用改性海藻酸钙凝胶为固定化酵母细胞的载体。中试研究中设计了较合理的中试工艺流程，优选出较佳的发酵条件，并考察了生物反应器的性能。试验获得了如下结果：中试装置已运转１９２天，固定化酵母仍保持高活力，并可继续运转；发酵成熟醪酒精含量达６．５～８．０％（ｖ），它比同期传统式酒精发酵高出０．３～０．４％；淀粉利用率达９１～９２％；固定化酵母生物反应器的乙醇生产能力为９．５ＫｇＥｔＯＨ／Ｍ￣３·ｈ，它可比传统式发酵罐的生产能力提高１０～１２倍。     

住宅建筑能耗的特点及其评价指标的确定

本文首先回顾了国际上对于住宅建筑能耗的研究工作,然后对住宅建筑能耗的特点进行了分析,指出在研究的初始阶段,可以使用单位地板面积上的能耗等指标作为住宅建筑能耗的评价指标,但是由于这些指标都是针对某一特定的能耗系统提出的,因而都具有一定的局限性,所以如何确定一个更为全面、更为客观的评价指标仍是今后的一个研究内容。     

具有失速调节的变转速风力机的动态分析与控制策略

失速调节变车风力机是非线性而且在额定风速以上不稳定的系统,风力机的跟踪控制又是分段实现的,研究其动态特性和控制策略对风力机的稳定性和可靠性尤其重要,从风力机的动力关系出发,分析了风力机在额定风速上下的运行特性,确定了相应的跟踪控制方案,并对试验风力机进行控制设计,给出了不同方案的计算机仿真结果及比较分析。     

渤海某油田弱氧化复合解堵技术研究及应用

针对渤海某油田部分注水井修井及调剖作业后聚合物滞留导致常规酸化解堵效果不佳的问题,从聚合物污染机理出发提出采用弱氧化复合解堵措施对注水井进行解堵,通过岩心驱替等室内实验,研制出一种针对聚合物污染的弱氧化解堵剂PO-01,实验表明,4％PO-01可使0.8％HPAM黏度降低99.95％.该技术已经在现场应用6井次,措施后...     

加氢裂化装置生产工业白油的技术开发与工业应用

目的 降低炼厂的柴汽比,提高企业经济效益。方法 对惠州石化4.0 Mt/a蜡油加氢裂化装置生产5号工业白油的可行性进行了分析,认为通过提高柴油馏分初馏点实现生产5号工业白油产品是可行的。前期,装置已通过主分馏塔降压调整、增设蒸汽汽提塔和原柴油汽提塔再沸器改蒸汽汽提工艺3种方式提高柴油初馏点,均未取得良好的运行效果。鉴于以上3种工艺的局限性,开发了热氮气气提工艺,工艺采用热氮气气提替代柴油汽提塔塔底再沸器,主分馏塔塔顶排出不凝气,以维持塔压稳定。结果 该工艺实施后,装置生产合格白油60 t/h,航煤产量增加14 t/h,不凝气产量增加1.3 t/h,不再产柴油产品;白油产品开口闪点由85℃提高至126℃,解决了开口闪点低和产品含水问题。结论 采用该工艺生产的5号工业白油产品性质稳定,满足行业指标的要求,装置改造工程量小,经济效益显著,对国内外同类装置的生产优化具有重要的借鉴意义。     

Adaptive Spatial Channel Mapping in MIMO Relay Systems: A Unified Framework

In multi-input-multi-output relay systems with amplify-and-forward protocols, the source-relay and the relay-destination links can be treated as two groups of spatial channels. In this letter, an adaptive spatial channel mapping matrix is presented to be used between the two groups. A unified framework of the spatial channel mapping matrix design is presented, which includes various relay protocols. The spatial channel matrix is designed to reduce the relaying noise power or the local noise in the destination node. Simulation results demonstrate the advantage of the adaptive spatial channel mapping on the system reliability and capacity with different relay protocols.      

Thermal Conductivity of Exfoliated p-Type Bismuth Antimony Telluride

A bulk p-type thermoelectric compound with nominal composition Bi_0.5Sb_1.5 Te₃ has been exfoliated using dimethyl sulfoxide as a solvent. Samples have been prepared from the exfoliated platelets by pressing followed by sintering or hot pressing. The exfoliated nanoplatelets have been characterized for size distribution and composition using scanning electron microscopy and energy-dispersive spectrometry. The smallest size platelet was 40 nm, and the maximum in the size distribution was near 80 nm. The exfoliated platelets and sintered sample showed significant deficiency in Sb and Te. The nonstoichiometry in the composition of the exfoliated platelets indicates that the mechanism of exfoliation may not be between quintuplets only, with other layers also being active. The composition of the hot-pressed sample remained closer to that of the bulk. Results of x-ray diffraction indicated the presence of Bi₂Te₃ and Bi_0.5Sb_1.5Te₃ phases and pure Te and Sb. Residual porosity was observed in the hot-pressed and sintered samples. The thermal conductivity of the samples was measured by transient thermoreflectance. The results showed that the thermal conductivity of the hot-pressed sample was reduced by a factor of two compared with that of the bulk as a result of the presence of a high density of interfaces and residual porosity. The thermal conductivity of the sintered sample showed an increase above that of the bulk sample, which is explained by the change in composition due to loss of Sb and Te.