煤油加氢反应产物换热器结垢分析

针对某煤油加氢装置反应产物与原料换热器出现结垢现象,对3台换热器E-101A/B/C结垢现象、结垢位置、结垢程度进行了计算分析.结果表明：E-101A/B/C总换热系数不断降低,由193.70 W/（m2·K）下降至127.79 W/（m2·K）,降幅达34.0％,严重影响换热器的换热效果.根据管侧压力降从0.18 MPa升至0.25 MPa,增幅达38.9％,而壳侧压力降基本稳定,且E-101A管程垢阻达314×10-5（m2·K）/W,明显高于E-101B/C管程垢阻,判断换热器结垢位置为E-101A管程.装置停工检修中发现：E-101A管程出口出现大量铵盐结块,且在清洗中部分管束堵塞;E-101B/C管程及3台换热器的壳程未见显著结垢.换热器拆检结果验证了前期计算结果的准确性.结合计算分析及实际结垢情况提出改进建议.     

TRT6000水文地质探测仪在田兴铁矿中的应用

介绍了司家营田兴铁矿采选工程概况以及TRT6000超前地质预报仪器在田兴铁矿平巷及斜坡道施工中的应用.采用成像技术,生成工作面前方地层结构的全息三维图,取得良好的探测效果.实践证明,探测前方100 m内的地质情况,与实际情况基本相符.说明了TRT6000超前地质预报在平巷及斜坡道施工过程中的重要性,能够指导平巷及斜坡道安全快速施工,降低井巷施工成本.     

晶振源特性对IEEE1588同步性能影响的量化分析

晶振源质量是IEEE1588同步性能的决定性因素之一,其影响程度受复杂物理特性及时钟伺服影响,量化分析尚不完善,仅能适用于高稳晶振。以经典PI伺服为例,引入时钟伺服影响因子,推导出晶振准确度和稳定度对IEEE1588同步性能的影响公式,基于改进型终端搭建满足理论假设的实测环境,统计测得基于XO-5ppm的同步精度优于500 ns、标准差约为130.97 ns,基于OCXO-0.5ppm的同步精度优于50 ns、标准差约为7.95 ns。测试表明同等环境下,晶振质量对IEEE1588同步起到决定性影响,完善后的量化分析同时适用于高稳晶振和低稳晶振,具有更好的适用性。     

Sensor design and implementation for a downhole NMR fluid analysis laboratory

This paper tries to build a multi-functional downhole nuclear magnetic resonance (NMR) fluid analysis laboratory that can evaluate fluid information in real time at reservoir conditions at a depth of several thousand meters. The aim is to monitor the pollution of the formation fluids and quantitatively evaluate NMR characteristics of the fluids. It focuses on the design of the structure and parameters of a sensor with zero stray fields. Two separate coils are designed to measure NMR characteristics of flowing or static fluids. A method is proposed to use the Bloch equation, to guide the optimization of the NMR sensor. Finally, the measured results confirm that the design is reasonable. There is a homogeneous static field (perpendicular to the axial direction) in the center of the sensor, and there are no stray external fields. The novel design of pre-polarization magnet improves the signal to noise ratio, while shortening the sensor length.     

基于模糊神经分数阶PI2Dμ 的储能电源逆变控制

针对传统PID控制器存在抗干扰能力差、参数整定困难、时变控制不确定等不足,为进一步提高储能电源逆变输出电压波形质量,增强控制系统的鲁棒性,提出了基于优化模糊PID控制器的控制策略。在介绍分数阶控制器定义及其数学实现的基础上,该方法引入模糊控制规则对控制器的结构参数进行调整,同时融合了神经网络的自学习能力,通过在系统工作时动态调整隶属函数和完善模糊控制规则,实现控制器参数的在线调节和优化。仿真结果表明,优化后的控制器具有更灵活的结构和更强的鲁棒性,具备良好的动态特性和自适应能力,能够满足储能电源逆变控制的要求。     

Synthesis, characterization, fluorescence and DNA-binding studies of europium（Ⅲ） pirates complexes with amide-based 2,3-dihydroxynaphthalene derivatives

Two ligands 2,2′-[2,3-naphthylenebis(oxy)]-bis(N-benzyl(acetamide))(L1) and 2,2′-[2,3-naphthylenebis (oxy)]-bis(N,N-diphenyl (acetamide))(L2) and their europium(Ⅲ) picrate complexes were synthesized. The complexes were characterized by elemental analysis, infra-red (IR), thermogravimetry and differential thermal analysis (TG-DTA) and molar conductivity. Fluorescent experiments showed that the resonance level of the Eu) matched better to the triplet state energy level of the ligand L2 than that of the ligand L1 and the fluorescence in-tensities of the complexes were reduced with the raising coordination ability of solvent. In addition, the interactions between the complexes and DNA were studied by means of spectrometry and cyclic voltammetry. The results suggested that the complexes could bind to DNA through intercalation and the complex 1 binded to DNA more strongly than the complex 2.     

郴州市矿山地质环境问题及综合整治

矿业是郴州市经济的支柱产业,郴州市的矿山地质环境问题具有种类多、分布广、危害严重的特点.在论述了郴州市矿山地质环境和治理现状的基础上,根据郴州市的实际情况,提出提高认识,加快科技创新步伐;提高矿山二次资源的综合利用水平等矿山地质环境的综合整治措施.