干法选煤评述

文章以大量详实的资料,回顾了干法选煤技术的理论与实践研究成果和取得的新进展,指出了研究先进高效的干法选煤技术对顺应我国煤炭工业战略西移,促进洁净煤事业的全面发展的重要意义。     

磁约束脉冲放电电路分析

在已进行的实验研究的基础上,对所设计的磁约束脉冲放电电路进行了理论分析,获得了有关磁约束放电情况下的电路特性的认识。作者的研究为应用于磁约束放电的电路的进一步研究和改进打下了基础。     

质量诊断的模糊专家系统

本文提出了有学习功能的质量诊断的模糊专家系统的基本模型，当生产过程出现异常时，将所记录的各各模糊症状输入到系统中，通过模糊推理运算后，最后输出一个或几个最有可能发生的异常因素以及相应的解决方案。该系统能比较充分地利用生产过程模糊信息，积累专家的技术和实践经验，从而为生产过程的稳定提供了保障。本文首先给出了系统的基本结构，随后讨论了系统的算法和学习功能。     

Analysis of interaction between liposome membranes induced by stress condition: Utilization of liposomes immobilized on indium tin oxide electrode

NBD-cholesterol (NBD-Ch)-modified liposome was immobilized on indium tin oxide (ITO) electrode via the covalent binding method. The transfer of NBD-Ch between the immobilized liposomes and the target liposomes was observed by using a fluorescent microscope. The addition of liposome suspension co-incubated with α-chymotrypsin or stimuli-responsive polymer to the surface of the above ITO electrode, enhanced the liposome–liposome interaction, resulting in the promotion of NBD-Ch transfer. The apparent transfer rate constant of NBD-Ch was found to be correlated with the index for the liposome–liposome interaction evaluated by an immobilized liposome chromatography. This suggests that the present method using the liposome-immobilized ITO electrode was effective to evaluate the liposome–liposome interaction induced by the protein or the stimuli-responsive polymer under stress conditions.     

Designing the Width and Texture of Vanadium Oxide Macroscopic Fibers: Towards Tuning Mechanical Properties and Alcohol‐Sensing Performance

Macroscopic vanadium oxide fibers have been fabricated by an extrusion process. By varying the shear rate associated with the gel extrusion process we have been able to tune the diameter and transversal geometry of the fibers at macroscopic length scales. At the mesoscopic length scale, small‐angle X‐ray scattering (SAXS) analysis provides evidence for the possibility of fine tuning the degree of alignment of the V₂O₅ ribbons inside the fibers; this alignment is clearly improved upon increasing the shear rate. Nitrogen physisorption measurements (Brunauer–Emmett–Teller (BET)) indicate that the as‐synthesized fibers exhibit poor mesoporosity, largely due to the presence of remaining poly(vinyl alcohol) (PVA) entities. Microscopically, from XRD measurements, the fiber structure appears to be semi‐crystalline. ⁵¹V magic angle spinning NMR (MAS NMR) spectroscopy reveals that the local environment of ⁵¹V is typical of the structure of a V₂O₅·1.8 H₂O xerogel. We demonstrate here that the alignment of the nanoribbon subunits can be tuned via the shear rate applied during the extrusion process, which provides a good handle for tuning the mechanical and sensing properties of the as‐synthesized fibers.     

Improvement and induction property of radiation-responsive promoter through DNA shuffling of 5′-flanking regions of the human p21 gene

A promoter that augments gene expression in response to stimulation of ionizing radiation would be a desired tool for radiogenetic therapy, a combination of radiotherapy and gene therapy. Although various promoters occurring naturally or artificially have been used for researches, one showing higher reactivity to ionizing radiation is desirable. In the present study, we attempted to improve a radiation-responsive promoter of the p21 through a technique called DNA shuffling. A library of DNA fragments was constructed by re-ligation of randomly digested promoter fragments and improved promoters were chosen out of the library. We repeated this process twice to obtain a promoter showing 2.6-fold better reactivity to ionizing radiation compared with its parent, p21 promoter after 10 Gy γ-ray irradiation. Nucleotide sequence analyses revealed that the obtained promoter was densely packed with some of the cis-acting elements including binding sites for p53, NF-κB, NRF-2, AP-1 and NF-Y more than p21 promoter. In addition, it was shown that its induction by ionizing radiation was dependent upon p53 status of a cell line, suggesting that the promoter retained properties of the p21 promoter. This technique is simple and efficient to improve a promoter responsive to other stimulus of interest besides IR.     

MCR型SVC在轧钢供电系统中的仿真与应用

针对某轧钢厂10 kV母线的电能质量治理问题,将MCR型静止型动态无功补偿器(SVC)应用于该厂供电系统的改造。介绍了MCR型SVC的工作原理及特点,根据该厂10 kV母线的实际负荷情况,利用Matlab/Simulink仿真软件,搭建MCR型SVC仿真模型并进行仿真设计。实测数据表明,MCR型SVC在10 kV轧钢供电系统中能够有效地提高功率因数、抑制谐波,说明所采用的工程设计结合仿真分析的方法取得了良好的效果。