红沿河核电厂主变在线色谱分析装置选用与评价

电力变压器在核动力发电厂可以被视为机组连接外电源(500k V电网)的"咽喉",它承担着同电网之间传输电能的重要任务。在核电机组运行期间,如出现主变不可用的情况,机组将被迫停堆,由此可见主变其重要性。而目前变压器油样分析在业内被视作反映变压器内部健康状况的"晴雨表",通过对油中气体含量进行取样分析,可以预判变压器内部是否出现局部放电、电流冲击、甚至短路等故障。而油色谱在线监测装置具有实时、快速、准确对油样气体含量进行分析的作用,采样周期比人工采样明显缩短,因此也为业界广为应用。     

The distinctive characteristics of combustion duration in hydrogen internal combustion engine

As a practical solution to reduce the emission pollution and energy crisis, the research and development of HICE has been processed in several decades. The focus of this paper is trying to explore the new features of the combustion duration in HICE not only by engine experiment, but also by analysis of the physical properties of hydrogen, especially the obvious difference from that of gasoline. Firstly, the laminar flame speed difference between hydrogen and gasoline was studied and discussed. Secondly, a distinctive rule of combustion duration in HICE was discovered by analyzing the experiment data. Finally, as a key reference point to the HICE operation, a new characteristic of the location of 50% mixture combust up was proposed and analyzed, this will be helpful for the calibration of optimum ignition timing.     

一种基于运动趋势估计的行人检测算法

近年来,车辆的主动安全研究已经引起广泛的关注。针对汽车主动安全中行人检测的需求,基于彩色差值模型算法,通过Gauss算法分割图像和kalman滤波预测目标在下一时间可能出现的活动区域,提出了一种基于运动趋势估计的行人检测算法。经仿真表明,该汽车动态目标检测算法可实现行人运动趋势的估算,具有较好的实时性、可靠性。     

S Zorb吸附剂中硅酸锌的成因研究

S Zorb临氢脱硫技术是国内汽油升级的重要技术,但吸附剂中硅酸锌的生成会加速吸附剂的失活。试验研究吸附剂中硅酸锌的成因,得到吸附剂在水热环境中生成硅酸锌的最低温度650℃;考察待生吸附剂再生过程中各种因素的影响,得出硅酸锌生成的主要影响因素是氧分压;根据吸附剂再生曲线,结合催化剂颗粒再生瞬态温升模拟,推出吸附剂颗粒过热是吸附剂生成硅酸锌的主要原因,氧分压则是颗粒过热以及硅酸锌生成的主要影响因素。     

需要系数法和负载系数法比较及选择应用

需要系数法是国内负荷计算常用方法,但通常具有局限性。本文通过国外某实际工程,将负荷系数法和需要系数法进行比较,并利用EDSA搭建模型,通过软件计算结果验证两种计算方法的准确性和实用性。     

基于矩阵分析的团体操队形变换行进路线仿真算法

目前计算机仿真技术受到体育科研和教学人员的普遍青睐.计算机仿真技术能够为体育工作者和运动员提供更加有效的、崭新的训练指导.论文通过对大型团体操队形变换路线策略的研究,提出了一种路线变换算法——最短路线优先算法.同时,针对产生的路线冲突问题,提出了一种解决冲突的方法.最后对论文提出的算法进行了仿真分析,说明能够为团体操的演练提供很好的辅助手段.     

Phenanthrene Metabolites from a New Polycyclic Aromatic Hydrocarbon-Degrading Bacterium Aeromonas salmonicida subsp. Achromogenes Strain NY4

A new polycyclic aromatic hydrocarbon (PAH)-degrading Gram-negative bacterium Aeromonas salmonicida subsp. achromogenes strain NY4 was isolated from coking wastewater sludge. Strain NY4 could not grow on1-hydroxy-2-naphthoic acid, hexadecane or hexanol as sole carbon source but phenanthrene. This strain was able to utilize several known microbial metabolites of PAHs, including catechol, protocatechuic acid, salicylic acid, and phenol as sole carbon source. The mixture of the acidic and neutral fraction, acidic fraction alone and neutral fraction alone of phenanthrene metabolites were prepared and analyzed by GC-MS. A total of at least 27 metabolites were identified as the degradation products of phenanthrene by strain NY4. Among them, 1-hydroxy-α-oxo-2-naphthaleneacetic acid, 2-hydroxy-α-oxo-1-naphthaleneacetic acid, 2-hydroxy-1-(1-hydroxy-2-naphthalenyl)-ethanone, 1,2-dihydro naphtha [2,1-b] furan-2-ol and 2,3-dihydro naphtha [1,2-b] furan-2-ol have not been reported as the metabolites of phenanthrenes so far. The accumulation patterns of phenanthrene metabolite accumulation by strain NY4 depended on the incubation time, inoculum size and concentration of phenanthrene. Based on the degradation metabolites of phenanthrene by strain NY4, degradation pathways are proposed. This is the first report of PAH degradation in Aeromonas salmonicida, which lay the foundation for recognition and further characterization of PAH degradation metabolites and pathways in Aeromonas salmonicida strains.     

锂离子电池正极材料锂钒氧的制备及表征

以Li2CO3和V2O5为原料，采用固相法制备了锂离子电池正极材料LihV3O8，并通过XRD、SEM、粉末微电极循环伏安、恒流充放电及交流附抗等测试手段对其物理性能和电化学性能进行了表征。结果表明：所合成产物旱棒状，衍射特征峰与LiV3O8标准谱图基本一致，为单一物相．层状结构。产物具有较好的可逆性．初始容量为238．7mAh·g^-1，15次循环容量衰减至201．6mAh-g^-1，容量保持率为84．46％。粉末微电极循环伏安结果表明：Li^＋的嵌入脱出过程机理不同，嵌入是一个多相转变过程。计算得到材料的电导率为2．74×10^-5S．cm^-1     

高速公路机电系统管理与维护中出现问题及解决对策

高速公路中机电系统的重要性是不言而喻的,当前阶段机电系统逐渐朝着网络化和智能化发展,其管理与维护工作将变得更加困难,对技术的要求会更高。本文首先简单介绍了高速公路机电系统管理维护体系,然后重点阐述了当前阶段机电系统管理与维护工作中常见问题,最后综合笔者实践经验提出有针对性的解决对策,以期对提升机电系统稳定性有所帮助。     

混凝土建筑加固技术探析

随着我国对建筑工程施工要求的日益严苛，部分混凝土建筑物在施工过程中，由于设计图纸的变更或施工材料质量问题等原因，导致混凝土建筑物出现使用功能变化或质量安全等问题。本文主要对混凝土建筑物实施加固技术的施工方法进行了探析。