瓦斯燃烧器回流区测试

燃烧器流场内回流区的大小和形状决定了燃烧火焰的稳定性 ,利用APV激光测速系统 ,在燃烧器冷态测试实验装置上对一瓦斯燃烧器冷态模型的流动进行了研究 ,发现了该燃烧器流场内的双回流区结构 ,并得到了中心回流区尺寸与稳焰器结构的关系 ,为该结构类型燃烧器的稳焰设计及稳焰能力的评价提供了实验依据     

不清根手工双面焊材料及工艺研究

本文分析了中厚板传统手工双面焊存在的诸如打底焊焊缝质量无法保证，需用碳弧气刨清根；工人劳动强度大；生产效率低；焊接质量不稳定等主要问题。为提高打底焊焊道质量，不用清根使背面得到良好的凹成形，研制了适合Ｘ形坡口的梯形体陶瓷衬垫。探讨了焊缝背面成形的主要影响因素及控制方法。     

九江市1998年抗洪回顾与反思

通过九江市１９９８年汛情特点的分析，及抗击这次超历史洪水各项措施的总结，进行了深刻的反思     

凝土温度特性参数反分析及其应用

建立混凝土温度场材料特性参数反演分析模型,并用有限单元法仿真计算和可变容差法编制了优化反演程序。数值算例表明该算法是稳定的,收敛速度较快,并给出具体的在建工程实例的应用情况。通过现场温度观测值,进行优化反演计算得到混凝土温度的有关特性参数,这将成为部分或全部替代仅靠实验室选取参数的行之有效的途径之一。     

复杂深井尾管固井及回接技术实践

尾管悬挂固井是一种工程经济效益较高、注水泥环空阻力较低且有利于改善套管柱轴向设计和再钻进水力条件的固井方法，常常应用于深井超深井的固井作业。鄯科1井是一口科学探索井，完井尾管具有井径极不规则（实测井径扩大率最大为139.82%，最小为－6.02%）、施工压力高（15~20 MPa）、封固段长（考虑水泥余量的情况下封固段可长达1500 m）和尾管回接固井要求封固两头且不使用分级注水泥等难点。文章针对固井难点，总结出一套适用于复杂深井尾管及其回接固井的优化设计关键技术，它主要包括管串选择、套管扶正器加法、水泥浆体系优选、施工压力校核和配套工艺措施。实践证明，这些技术对类似井的固井作业具有实际的参考价值。     

公路桥涵台背设计的理论方法探讨

介绍了近年来国内外研究人员对桥涵台背的设计研究方法，结合桥涵与台背结构组合的设计原则，从搭板的型式、坡度、长度、厚度、配筋等方面提出了搭板设计的方法。     

Interconnected power systems with superconducting magnetic energy storage

The objective of this work is to discuss the concept of back‐to‐back interconnection systems with energy storage, especially with a Superconducting Magnetic Energy Storage (SMES) incorporated into a back‐to‐back DC link. In this case, each converter of the back‐to‐back system is used as a power conditioning system for the SMES coils. Since the AC–DC converter can be designed independently of the frequency of the power system, a two‐way switch is connected to the AC side of each converter. This two‐way switch can select the interconnected power systems. By using the two‐way switches, this system can provide the stored energy in the SMES system to each interconnected power system through two AC–DC converters. For instance, lower‐cost power of each power network can be stored through two converters during the off‐peak hours and made available for dispatch to each power network during periods of demand peak. Then this system increases the reliability of electric power networks and enables the economical operations depending on the power demand. This paper describes the unique operations of the back‐to‐back interconnection with SMES and discuses the optimal SMES configuration for a 300‐MW‐class back‐to‐back interconnection. © 2008 Wiley Periodicals, Inc. Electr Eng Jpn, 164(2): 37–43, 2008; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20482     

英台地区天然水驱油藏的开发特点及稳产技术

掌握边底水运动规律，控制并利用活跃的边底水能量，是成功开发天然水驱油藏的关键。英台地区的英台、四方坨子和一棵树等三个油田均为天然水驱油藏，天然能量充足。油藏投入开发后初期含水较高，含水上升极快，造成产油量大幅度递减。针对其开发特点，适时采用大泵、电潜泵提液强采，通过大量补孔层间接替以及加密调整和扩边等稳产技术措施，确保了油藏以3％-5％的采油速度长期稳产，水驱采收率高达50％以上。     

整流逆变器在港口起重机械中的应用

根据起重机械特点,在港口机械中的交流变频控制系统中,整流逆变器(也称可逆PWM整流器,简称变流器)组合应用,提高作业效率,降低电能损耗,节省成本.     

Development of calibration models for quality control in the production of ethylene/propylene copolymers by FTIR spectroscopy,multivariate statistical tools,and artificial neural networks

Principal component regression (PCR), partial least squares (PLS), StepWise ordinary least squares regression (OLS), and back‐propagation artificial neural network (BP‐ANN) are applied here for the determination of the propylene concentration of a set of 83 production samples of ethylene–propylene copolymers from their infrared spectra. The set of available samples was split into (a) a training set, for models calculation; (b) a test set, for selecting the correct number of latent variables in PCR and PLS and the end point of the training phase of BP‐ANN; (c) a production set, for evaluating the predictive ability of the models. The predictive ability of the models is thus evaluated by genuine predictions. The model obtained by StepWise OLS turned out to be the best one, both in fitting and prediction. The study of the breakdown number of samples to be included in the training set showed that at least 52 experiments are necessary to build a reliable and predictive calibration model. It can be concluded that FTIR spectroscopy and OLS can be properly employed for monitoring the synthesis or the final product of ethylene–propylene copolymers, by predicting the concentration of propylene directly along the process line. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008