智能变电站状态监测通信体系设计

结合智能变电站技术的发展,对变电站设备状态监测技术和现状进行分析.为了融合变电站所有设备状态监测信息,首先按照智能变电站逻辑分层方法,分析智能变电站状态监测数据,提出系统通信方案;其次提出了融入智能变电站通信一体化的状态监测系统框架.在此基础上,详细阐述了状态监测信息接入控制器CAC的设计和功能设计.对其数据通信转发、历史存储、自管理、时钟同步以及监测系统安全进行了研究.为生产管理、设备选型、检修、智能电网决策分析提供数据支撑.     

Modeling of free eutectic growth and competitive solidification in undercooled near-eutectic alloys based on in situ measurements

Free eutectic growth and its competition with single-phase growth in solidification of undercooled near-eutectic alloys are not yet fully understood. In this paper, the historical development of eutectic growth models was reviewed. The LZ model of free eutectic growth was evaluated using recent data of eutectic growth velocities in an undercooled Ni_81.3Sn_18.7 eutectic composition. An excellent agreement was achieved between the LZ model and the data. Crystal growth velocities in off-eutectic Ni₈₃Sn₁₇ and Ni₈₀Sn₂₀ compositions were measured using a high-speed camera technique. The present data of the off-eutectic compositions and the recent data of the eutectic composition were modeled using the LZ model and the LKT/BCT model of free dendritic growth. The modeling revealed that the competition between the free eutectic growth and the single-phase growth is controlled by the highest interface temperature criterion. A coupled zone of the α-Ni-Ni₃Sn eutectic was calculated using this criterion. The coupled zone agrees well with studies of solidified structures of undercooled samples.     

钢渣配料生产水泥熟料的生产实验

选用两种钢渣配料生产水泥熟料,在生产试验中优选出两种钢渣的最佳配料方案,分析了钢渣对熟料煅烧过程、物理性能和能耗的影响。结果表明,钢渣中铁含量20%时,钢渣可作为铁质校正原料,三率值最佳取值,KH为0.91~0.93,SM为2.5~2.7,IM为1.5~1.6;钢渣配料,熟料煅烧生产状况良好,能明显提高熟料的产量,提高熟料的强度,降低熟料烧成煤耗,且碱度大的钢渣,熟料C_3S含量较高,煤耗降低也较多。     

沈阳煤业集团公司数字化矿山信息管理系统的应用

介绍了沈阳煤业集团公司数字化矿山信息管理系统的建设和实际应用情况,并系统论述了地理信息系统在煤矿安全监测方面的应用和发展方向,以及视频监控、视频会议、短信报警和信息集成管理在工作中所发挥的巨大作用。     

Coloration and Nonlinear Optical Properties of ZnTe Quantum Dots in ZnO–TeO2–P2O5 Glasses

ZnO–TeO₂–P₂O₅ glasses were prepared by melt‐quenching method. The color of the glass samples changed from colorless to pale red and dark red with increasing TeO₂ content. Coloration mechanism and nonlinear optical properties of ZnO–TeO₂–P₂O₅ glasses have been investigated. Raman spectra and transmission electron microscope measurements indicated the precipitation of ZnTe quantum dots in the glasses and ZnTe quantum dots are the origin of coloration. Z‐scan technique was used to examine the nonlinear optical properties of the glasses. The glass sample with 30 mol% TeO₂ exhibits large third‐order nonlinear optical susceptibility of 10^?11 esu.     

Preparation of aromatic poly(1,3,4‐oxadiazoles) pulps and their paper properties

To improve the paper properties of the poly(1,3,4‐oxadiazoles) (POD), the POD pulps were prepared by prechemical and mechanical methods to increase their polarity, contact area, and interaction. The fibrillated degree of the staple fibers was evaluated by the Canadian Standard Freeness and the specific surface area, while the surface free energy was calculated by the Micro–wilhelmy method. Meanwhile, the functional groups and compositions on the surface of the POD fibers were confirmed by the FTIR–ATR and the X‐ray photoelectron spectroscopy, and the surface morphological structure and the crystalline structure of the POD fibers were observed by the fiber analyzer, scanning electron microscope, and Wide‐angle X‐ray diffraction, respectively. It was found that the pronounced abrasive and distinctive grooves were formed on the surface of the POD fibers after prechemical and mechanical treatment. The surface free energy of POD fibers increased 8.41%, and the polar part increased by 32.10% after treatment. It was confirmed that the polar functional groups and fibril were formed after chemical and mechanical treatment, so the interaction of the POD fibers was highly enhanced, and as a result the apparent density, tensile strength, fold endurance, and tear strength of the paper formed by those treated fibers were all improved apparently. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 39818.     

亚铁还原土壤浸滤液中六价铬的影响因素及稳定性探究

文章以Fe(Ⅱ)为还原剂,土壤浸滤液中Cr(Ⅵ)为处理对象,研究了处理效果与pH、氧化还原条件和反应时间的关系。结果表明在pH为中性,厌氧的条件下Fe(Ⅱ)对于Cr(Ⅵ)具有较好的还原效果。在一个月的反应时期内曝气组中Cr(Ⅵ)呈现先降低后增加的趋势,建议在实施化学还原技术修复土壤重金属铬污染的时候结合微生物以及固定化等技术联合治理。     

Oxidation behavior of micro-sized Al2O3–TiC–Co composites prepared from cobalt-coated powders

The oxidation behavior of hot-pressed Al₂O₃–TiC–Co composites prepared from cobalt-coated powders has been studied in air in the temperature range from 200 °C to 1000 °C for 25 h. The oxidation resistance of Al₂O₃–TiC–Co composites increases with the increase of sintering temperature at 800 °C and 1000 °C. The oxidation surfaces were studied by XRD and SEM. The oxidation kinetics of Al₂O₃–TiC–Co composites follows a rate that is faster than the parabolic-rate law at 800 °C and 1000 °C. The mechanism of oxidation has been analyzed using thermodynamic and kinetic considerations.