高倍率循环流化床锅炉运行图的绘制与应用

针对高倍率循环流化床锅炉的运行特点,以一台65 t/h高倍率循环流化床锅炉为例,对流化床冷态特性试验数据进行分析,最终绘出65 t/h循环流化床锅炉运行图,以指导锅炉实际运行控制和负荷调整。     

地质雷达在桩底基岩地质缺陷勘探中的应用

在桩基础施工过程中,由于初期地质勘察具有局限性,因此需要对桩底再进行小范围的地质缺陷勘探,并对其进行定位,以为后期建设提供指导。在鸭池河特大桥桩基础施工过程中,采用地质雷达对桩底进行勘探,并对桩底破碎带等缺陷进行定位,以此为依据,采取相应的措施,确保工程质量,达到了较好的效果。     

Multi-coefficients goal programming

In today’s increasingly competitive business environment, maintaining profit margins or quantities of goods sold is an important issue for businesses. Accordingly, more and more industries use group pricing discrimination strategy to attract potential customers in order to increase competitive advantage. Hence, to find ways maximize profit and to minimize total cost, group pricing discrimination strategy has become an important issue for decision makers. Unfortunately, these types of problems cannot be solved by any current goal programming models. The objective of this study is to deduce a new method, which we call the multi-coefficients goal programming, for group pricing discrimination problems. In addition, an example is given to illustrate the correctness and usefulness of the proposed model.     

A simplified method for the evaluation of fatigue crack front shapes under mode I loading

Two-dimensional elastic or elasto-plastic models dominate the current fatigue crack growth assessment and life prediction procedures for plate components with through-the-thickness cracks. However, as demonstrated in many theoretical and experimental papers, the stress field near the crack tip is always three-dimensional and, as a result, the fatigue crack front is not straight. It is normally curved towards the plate faces. Over the past few years there were a number of very careful numerical studies focusing on the evaluation of fatigue crack front shapes. However, the application of the direct numerical techniques to fatigue phenomena is a very tedious and time consuming process and, sometimes, it is quite ambiguous. In the current paper we develop a simplified method for the evaluation of the front shapes of through-the-thickness fatigue cracks. Further, we validate the developed method against experimental results, investigate the influence of various parameters on the crack front shapes at stable (steady-state) propagation and analyse the differences in the results of fatigue crack growth evaluation obtained with two- and three-dimensional approaches.     

First-principle studies of the electronic structure and reflectivity of LaTiO3 and Sr doped LaTiO3 (La1-xSrxTiO3)

The electronic structures and optical properties of pure and Sr doped LaTiO₃ were studied using the first-principle density functional theory (DFT). The results show that the Fermi surface of LaTiO₃ lies in its conduction band, which makes its reflectivity (about 68.3% at the laser wavelength of 10.6 ??m) much higher than other ceramic materials. Sr doping lowers the conduction band and reduces the band gap of La_1-xSr_xTiO₃ which is beneficial to the prompt of reflectivity. We also found that shifting of the conduction band is not linear with Sr dopant concentration, and a minimum energy level is reached when x?=?0.25. For the reflectivity of La_1-xSr_xTiO₃, it first increases and then decreases with increasing Sr concentration; a maximum reflectivity (99.2%) is achieved when x?=?0.25.     

沿空留巷技术在祁东煤矿的应用

主要从留巷概况、留巷优点、充填设备及材料选择、巷道超前加固、加固模板所采取的措施、应用效果及采取措施后所取得的经济效益等七个方面介绍了留巷技术在祁东煤矿6138工作面的推广应用。     

MEMS IMU随机误差建模在SAR运动补偿中的应用

随着SAR小型化发展趋势,低精度小型化微机电系统惯性测量系统（MEMS IMU）在SAR运动补偿中越来越受到重视。鉴于MEMS IMU 中随机误差较大,为提高其短时间内相对运动测量精度,从IMU测量误差对SAR成像的影响分析出发,采用基于时间序列分析方法对MEMS IMU中随机误差进行建模,并构建Kalman方程对IMU原始数据进行了滤波处理,减小了随机误差,从而降低随机误差在合成孔径时间内对SAR运动补偿的影响。机载SAR飞行试验数据处理结果表明,此方法能够有效的减小随机误差,提高SAR图像聚焦质量。     

原位聚合法制备具有长链支化的三元乙丙橡胶

采用铁系催化剂制备了具有1,2-结构的聚丁二烯,然后在钒系催化剂存在下进行乙烯和丙烯共聚合,原位合成了以聚丁二烯为第3单体的三元乙丙橡胶。并使用核磁氢谱、傅里叶变换红外光谱、三检测器系统凝胶渗透色谱联用仪和热重分析仪对所得的聚合物进行了表征。结果表明,聚丁二烯的质量大于1.0 g时,催化剂聚合活性缓慢降低。随着聚丁二烯用量的增加,相对分子质量增大,相对分子质量分布变宽。VOCl3-Al2(C2H5)3Cl3-ETCA催化体系中,当n(Al)/n(V)=60,n(ETCA)/n(V)=15时,以聚丁二烯作为第3单体具有最高的聚合活性。新型三元乙丙橡胶中既含有可用于硫化的双键,又具有一定量的长链支化结构,具有潜在的工业应用前景。