炼油生产调度研究现状与挑战

调度作为计划层和执行层的纽带,是智能型工厂的主要组成部分.对此,从炼油生产装置调度的角度,对炼油调度问题进行综述与分析.首先对炼油生产调度建模问题的研究现状进行阐述,介绍目前该领域建模方面考虑的因素;其次,对炼油生产调度的各种优化方法进行总结综述;最后,结合目前的信息技术和智能制造的发展趋势,分析炼油生产调度所面临的挑战和未来的研究方向.     

多孔陶瓷载体氧化铝涂层的研究

分别用纳米γ-Al₂O₃和SB粉制备了多孔陶瓷载体的Al₂O₃涂层。BET法测定了多孔陶瓷载体Al₂O₃涂层改性前后比表面积的变化。由SEM照片观察多孔陶瓷载体涂层改性前后表面和断面的形貌。结果表明，这两种方法对多孔陶瓷载体涂层改性均有效可行。     

EGD级环保型润滑油及其生物降解性

 经生物降解性评定和粘度测量确定了EGD级生物降解二冲程润滑油复合基础油的组成；通过发动机清净性试验确定了添加剂组成配方和总添加量。在此基础上，研制了生物降解二冲程油(Oil B)，其达到了ISO EGD级二冲程油标准中规定的6个发动机性能指标和2个理化性能指标，生物降解性达到73.1%。     

光电对抗仿真试验系统综述

论述了研制光电对抗仿真试验系统建设的目的和意义,光电武器系统的现状和发展趋势,介绍了光电对抗仿真试验系统的一般组成,给出了光电武器系统的常规试验内容和试验流程,并论述了可能采用的试验方法。     

基于多抽样率信号处理的无源雷达MTD方法

以数字电视信号为机会照射源的雷达系统研究为背景 ,提出用以多抽样率信号处理为基础的多级抽取信号处理算法解决运动目标检测中海量数据处理问题。文中叙述了数字电视广播信号回波的数学模型、多级抽取基本原理、目标检测算法 ,以数字电视信号为反射回波做了仿真 ,对运动目标进行检测 ,并对仿真结果做了分析。     

Prolonged tamoxifen exposure selects a breast cancer cell clone that is stable in vitro and in vivo

The effects of long-term tamoxifen exposure on cell growth and cell cycle kinetics were compared between oestrogen receptor (ER)-positive (MCF-7) and ER-negative (MDA-MB-231) cell lines. In the MCF-7 cell line, prolonged tamoxifen exposure (0.5 mumol/l for > 100 days) blocked cells in G0-G1 of the cell cycle, and slowed the doubling time of cells from 30 to 59 h. These effects corresponded to an increase in the cellular accumulation of tamoxifen over time [mean area under concentration curve (AUC) = 77.92 mumoles/10(6)/cells/day]. In contrast, in the MDA-MB-231 cell line, long-term tamoxifen exposure had no obvious effect on the doubling time, and reduced cellular tamoxifen accumulation (mean AUC = 50.50 mumoles/10(6)/cells/day) compared to the MCF-7 cells. Flow cytometric analysis of MDA-MB-231 cells demonstrated that a new tetraploid clone emerged following 56 days of tamoxifen exposure. Inoculation of the MDA-MB-231 tetraploid clone and MDA-MB-231 wildtype cells into the opposite flanks of athymic nude mice resulted in the rapid growth of tetraploid tumours. The tetraploid tumours maintained their ploidy following tamoxifen treatment for nine consecutive serial transplantations. Histological examination of the fifth transplant generation xenografts revealed that the tetraploid tumour had a 25-30 times greater mass, area of haemorrhage and necrosis, a slightly higher mitotic index and was more anaplastic than the control neoplasm. The control wildtype MDA-MB-231 tumours maintained a stable ploidy following tamoxifen treatment until the eighth and ninth transplantation, when a tetraploid population appeared, suggesting that tamoxifen treatment may select for this clone in vivo. These studies suggest that prolonged tamoxifen exposure may select for new, stable, fast growing cell clones in vitro as well as in vivo.     

Dy3+激活的几种硼酸盐在VUV-VIS范围的光谱性质

本文报道了SrAl2B2o7:Dy^3 、BaAl2B2O7:Dy^3 、SrAl3BO7:Dy^3 、La2CaB10O19:Dy^3 的紫外－真空紫外（UV－VUV）激发光谱和UV激发下的发射光谱。根据发射光谱讨论了Dy^3 离子在这几种基质中发光的黄蓝比（Y／B）。在VUV激发光谱中推测了Dy^3 的f-d跃迁及电荷迁移态（CTS）和基质吸收的位置。     

浅谈南水北调中线S13标渠道机械化衬砌施工技术

南水北调渠道混凝土衬砌,由于其工程等级属于Ⅰ等,总干渠渠道为Ⅰ级建筑物,且渠底宽度较大,边坡坡度较缓,衬砌分缝较多,无论从资源投入、工效还是工程质量达到设计要求都有相当大的难度,渠道衬砌机施工技术正好解决这个难题,实现了机械化作业,值得在南水北调中线工程渠道施工中推广和应用.     

Photoluminescence and X-ray Diffraction of Distributed Bragg Reflector

Spectral and structural characteristics of distributed Bragg reflector (DBR) in vertical-cavity surface-emitting lasers were studied with photoluminescence and double- crystal X- ray diffraction measurement. The expected high quality epitaxial DBR structure was verified. In the X- ray double- crystal rocking curves of DBR the zeroth- order peak, the first and second order satellite peaks were measured. Splitting of diffraction peak appeared in the rocking curves was analyzed. The effects of introduced deep energy levels on the structural perfection and optical properties were discussed.     

引水发电系统无压隧洞中弃水堰位置的数值模拟研究

水电站引水发电系统无压隧洞中的水力过渡过程是近年来电站设计中出现的一个新课题,特别是流域梯级电站开发中经常遇到。结合工程实例应用扩散法,给出了无压隧洞水力过渡过程数值模拟的基本方程以及上下游及弃水堰等边界附加方程,模拟了弃水堰布置在不同位置下,无压隧洞内的水位变化过程。研究成果和讨论对实际工程应用具有参考意义。